CN115085344B - Intrinsic safety explosion-proof circuit of lithium battery box - Google Patents

Intrinsic safety explosion-proof circuit of lithium battery box Download PDF

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CN115085344B
CN115085344B CN202211003106.8A CN202211003106A CN115085344B CN 115085344 B CN115085344 B CN 115085344B CN 202211003106 A CN202211003106 A CN 202211003106A CN 115085344 B CN115085344 B CN 115085344B
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resistor
integrated chip
pin
battery
circuit
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CN115085344A (en
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李栋庆
王进
梁耀林
张亚峰
刘慧锋
张超
贺俊义
杨艳
张经
郑扬帆
崔世杰
杜文卓
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Shanxi Keda Automation Control Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/62—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements against overcurrent
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/50—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries acting upon multiple batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/64—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements against overvoltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/65—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements against overtemperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/663—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Details of circuit arrangements for charging or discharging batteries or supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

本发明公开了一种锂电池盒本安防爆电路，属于锂电池技术领域，其包括：一级电池保护电路，与电池组连接，用于对电池组中的电池充放电进行过流保护、电压过欠压保护、温度保护；电池断电电路，与一级电池保护电路连接，用于实现电池开关断电；隔离电路，与电池断电电路连接，用于将电池隔离成预定电压的电源；二级电池保护电路，与隔离电路连接，用于对隔离电路输出的电压进行保护，实现电压安全输出。本发明将充电、放电通路进行分离，并分别进行了独立的设计和安全保护，确保了其满足本质安全的要求，增强了整个电路的安全性和可靠性。在电池离开供电本体时，可以快速、主动的切断电路，防止在电池移动过程中，本安端子放电。

Figure 202211003106

The invention discloses an intrinsically safe explosion-proof circuit for a lithium battery box, which belongs to the technical field of lithium batteries, and includes: a primary battery protection circuit connected to a battery pack for overcurrent protection and voltage protection for charging and discharging batteries in the battery pack. Overvoltage and undervoltage protection, temperature protection; battery power-off circuit, connected with the first-level battery protection circuit, used to realize battery switch power-off; isolation circuit, connected with battery power-off circuit, used to isolate the battery into a predetermined voltage power supply; The secondary battery protection circuit is connected with the isolation circuit, and is used for protecting the voltage output by the isolation circuit to realize safe voltage output. The invention separates the charging and discharging paths, and carries out independent design and safety protection respectively, which ensures that it meets the requirement of intrinsic safety and enhances the safety and reliability of the whole circuit. When the battery leaves the power supply body, it can quickly and actively cut off the circuit to prevent the intrinsically safe terminals from discharging during the battery moving process.

Figure 202211003106

Description

一种锂电池盒本安防爆电路A lithium battery box intrinsically safe explosion-proof circuit

技术领域technical field

本发明涉及锂电池技术领域，具体来说，涉及一种锂电池盒本安防爆电路。The invention relates to the technical field of lithium batteries, in particular to an intrinsically safe explosion-proof circuit of a lithium battery box.

背景技术Background technique

当前，电池供电是井下本安无线设备的主要供电方式，但由于煤矿特殊要求，严禁锂电池在井下充电，因此，电池的充电只能在地面进行，常规的锂电池与设备是为一体的，充电需要将电池和设备一起运送到地面，这从而增加了电池充电的困难，同时也需要增加额外设备来辅助进行。At present, battery power supply is the main power supply method for underground intrinsically safe wireless equipment. However, due to the special requirements of coal mines, lithium batteries are strictly prohibited from being charged underground. Therefore, battery charging can only be carried out on the ground. Conventional lithium batteries are integrated with equipment. Charging needs to transport the battery and equipment to the ground together, which increases the difficulty of battery charging, and also requires additional equipment to assist.

而为了解决该问题，煤矿领域采用了电池盒技术，电池盒为可更换式结构，其可以与设备进行分离，可以减轻电池运到地面的困难，同时也可以使得设备在井下长时间工作。In order to solve this problem, the coal mine field adopts the battery box technology. The battery box is a replaceable structure, which can be separated from the equipment, which can reduce the difficulty of transporting the battery to the ground, and can also make the equipment work for a long time underground.

但由于煤矿井下存在瓦斯和煤尘，因此，电池盒的控制线路不能发生短路、接地等故障，否则会产生电火花或电弧，导致煤矿井下引起瓦斯或煤尘爆炸。故，研究一种锂电池盒本安防爆电路就变得尤为重要。However, due to the existence of gas and coal dust in coal mines, the control circuit of the battery box must not be short-circuited or grounded, otherwise electric sparks or arcs will be generated, causing gas or coal dust explosions in coal mines. Therefore, it is particularly important to study an intrinsically safe explosion-proof circuit for a lithium battery box.

针对相关技术中的问题，目前尚未提出有效的解决方案。Aiming at the problems in the related technologies, no effective solution has been proposed yet.

发明内容Contents of the invention

针对相关技术中的问题，本发明提出一种锂电池盒本安防爆电路，能够将充电、放电通路进行分离，实现锂电池盒的本安防爆。Aiming at the problems in related technologies, the present invention proposes an intrinsically safe explosion-proof circuit for a lithium battery box, which can separate the charging and discharging paths to realize the intrinsically safe explosion-proof circuit for the lithium battery box.

本发明的技术方案是这样实现的：Technical scheme of the present invention is realized like this:

一种锂电池盒本安防爆电路，锂电池盒具有若干电池组，每组电池组均由若干节电池构成，所述锂电池盒本案防爆电路包括：An intrinsically safe explosion-proof circuit for a lithium battery box. The lithium battery box has several battery packs, and each battery pack is composed of several batteries. The explosion-proof circuit of the lithium battery box in this case includes:

一级电池保护电路，与所述电池组连接，用于对电池组中的电池充放电进行过流保护、电压过欠压保护、温度保护；A primary battery protection circuit, connected to the battery pack, used for overcurrent protection, voltage overvoltage and undervoltage protection, and temperature protection for charging and discharging batteries in the battery pack;

电池断电电路，与所述一级电池保护电路连接，用于实现电池开关断电；A battery power-off circuit, connected to the primary battery protection circuit, for realizing power-off of the battery switch;

隔离电路，与所述电池断电电路连接，用于将电池隔离成预定电压的电源；An isolation circuit, connected to the battery power-off circuit, is used to isolate the battery into a power supply of a predetermined voltage;

二级电池保护电路，与所述隔离电路连接，用于对隔离电路输出的电压进行保护，实现电压安全输出。The secondary battery protection circuit is connected with the isolation circuit and is used to protect the voltage output by the isolation circuit to realize safe voltage output.

其中，所述锂电池盒具有1组电池组，该电池组由3节电池构成，且所述锂电池盒的电池容量小于或等于100Wh。Wherein, the lithium battery box has a battery pack consisting of 3 batteries, and the battery capacity of the lithium battery box is less than or equal to 100Wh.

其中，所述隔离电路为4路隔离电路，该4路隔离电路将电池分成4路隔离的12V电源。Wherein, the isolation circuit is a 4-way isolation circuit, and the 4-way isolation circuit divides the battery into 4 lines of isolated 12V power supplies.

其中，所述一级电池保护电路包括一级电池保护电路的集成芯片U1、电阻R1-R14、整流二极管D1、电容C1-C7以及MOS管Q1-Q2；在一级电池保护电路中，所述集成芯片U1的VC1-VC3引脚分别通过电阻R2、电阻R3、电阻R5与电池BT1、电池BT2、电池BT3连接，所述集成芯片U1的VCC引脚与所述电池组的正极之间连接有串联的电阻R1和整流二极管D1；所述电阻R1、电阻R2、电阻R3、电阻R5与电池组负极之间分别连接有电容C1、电容C2、电容C3和电容C4；所述集成芯片U1的TEST引脚接地；所述集成芯片U1的VTC引脚与所述电池组的负极之间之间连接有串联的电阻R8和电阻R13；所述集成芯片U1的VTD引脚和TS引脚均与电阻R13连接，且所述集成芯片U1的VTD引脚与电阻R13之间连接有电阻R7；所述集成芯片U1的NCDRV引脚与所述电池组的负极之间连接有串联的电阻R6和MOS管Q1，且MOS管Q1的栅极与源极之间连接有电阻R10；所述集成芯片U1的VM引脚与所述电池组的负极之间连接有电阻R11；所述集成芯片U1的NDDRV引脚与所述电池组的负极之间连接有串联的电阻R4和MOS管Q2，且所述MOS管Q2的栅极与源极之间连接有电阻R12；所述集成芯片U1的CS引脚与所述电池组的负极之间连接有电阻R9、电阻R14以及电容C5，所述电阻R9与所述电容C5并联；所述集成芯片U1的两个CUVT引脚分别与所述电池组的负极之间连接有电容C6、电容C7；所述集成芯片U1的VSS引脚与所述电池组的负极连接。Wherein, the primary battery protection circuit includes an integrated chip U1 of the primary battery protection circuit, resistors R1-R14, rectifier diode D1, capacitors C1-C7, and MOS transistors Q1-Q2; in the primary battery protection circuit, the The VC1-VC3 pins of the integrated chip U1 are respectively connected to the battery BT1, the battery BT2, and the battery BT3 through the resistors R2, R3, and R5, and the VCC pin of the integrated chip U1 is connected to the positive pole of the battery pack. Resistor R1 and rectifier diode D1 connected in series; Capacitor C1, capacitor C2, capacitor C3 and capacitor C4 are respectively connected between the resistor R1, resistor R2, resistor R3, resistor R5 and the negative pole of the battery pack; the TEST of the integrated chip U1 The pin is grounded; a resistor R8 and a resistor R13 connected in series between the VTC pin of the integrated chip U1 and the negative pole of the battery pack; the VTD pin and the TS pin of the integrated chip U1 are connected to the resistor R13 is connected, and a resistor R7 is connected between the VTD pin of the integrated chip U1 and the resistor R13; a series resistor R6 and a MOS tube are connected between the NCDRV pin of the integrated chip U1 and the negative pole of the battery pack Q1, and a resistor R10 is connected between the gate and source of the MOS transistor Q1; a resistor R11 is connected between the VM pin of the integrated chip U1 and the negative pole of the battery pack; the NDDRV lead of the integrated chip U1 A series resistor R4 and a MOS transistor Q2 are connected between the pin and the negative pole of the battery pack, and a resistor R12 is connected between the gate and the source of the MOS transistor Q2; the CS pin of the integrated chip U1 is connected to the A resistor R9, a resistor R14, and a capacitor C5 are connected between the negative poles of the battery pack, and the resistor R9 is connected in parallel with the capacitor C5; the two CUVT pins of the integrated chip U1 are respectively connected to the negative poles of the battery pack. A capacitor C6 and a capacitor C7 are connected between them; the VSS pin of the integrated chip U1 is connected to the negative pole of the battery pack.

其中，所述电池断电电路包括电池断电电路的MOS管Q1-Q4、整流二极管D1-D4、电阻R1-R7以及开关K1-K2；在所述电池断电电路中，电池组正极与电池组负极之间连接有两组MOS管组，其中，一组MOS管组由串联的MOS管Q1和MOS管Q3构成，另一组MOS管组由串联的MOS管Q2和MOS管Q4构成；所述MOS管Q1与所述MOS管Q3之间以及MOS管Q2和MOS管Q4之间分别连接有电阻R4和电阻R5；所述MOS管Q1和MOS管Q3的源极之间连接有串联的电阻R2和稳压二极管一；所述MOS管Q2和MOS管Q3的源极之间连接有串联的电阻R3和稳压二极管二；所述MOS管Q1和MOS管Q2的源极与电池组正极之间连接有整流二极管D1-D4，其中，整流二极管D1与所述整流二极管D2并联，整流二极管D3与整流二极管D4并联；所述MOS管Q3和MOS管Q4的栅极与电池组的负极之间连接有电阻R7和稳压二极管三，所述稳压二极管三上连接有开关K1，所述电池组正极与所述电池组负极之间连接有串联的电阻R1和电阻R6，所述电阻R1与所述电阻R6之间连接有开关K2。Wherein, the battery power-off circuit includes MOS transistors Q1-Q4, rectifier diodes D1-D4, resistors R1-R7 and switches K1-K2 of the battery power-off circuit; There are two groups of MOS tube groups connected between the negative poles of the group, wherein one group of MOS tube groups is composed of MOS transistor Q1 and MOS transistor Q3 in series, and the other group of MOS tube groups is composed of MOS transistor Q2 and MOS transistor Q4 in series; A resistor R4 and a resistor R5 are respectively connected between the MOS transistor Q1 and the MOS transistor Q3 and between the MOS transistor Q2 and the MOS transistor Q4; a series resistor is connected between the sources of the MOS transistor Q1 and the MOS transistor Q3 R2 and Zener diode one; between the sources of the MOS transistor Q2 and MOS transistor Q3, a series resistance R3 and Zener diode two are connected; between the sources of the MOS transistor Q1 and the MOS transistor Q2 and the positive pole of the battery pack Rectifier diodes D1-D4 are connected between them, wherein the rectifier diode D1 is connected in parallel with the rectifier diode D2, and the rectifier diode D3 is connected in parallel with the rectifier diode D4; Resistor R7 and Zener diode 3 are connected, switch K1 is connected to the Zener diode 3, and resistor R1 and resistor R6 connected in series are connected between the positive pole of the battery pack and the negative pole of the battery pack, and the resistor R1 and the A switch K2 is connected between the resistors R6.

其中，所述隔离电路为4路隔离电路，且每路隔离电路均为由变压器、电源芯片、光耦反馈组成的反激式开关电源电路。Wherein, the isolation circuit is 4 isolation circuits, and each isolation circuit is a flyback switching power supply circuit composed of a transformer, a power chip, and an optocoupler feedback.

其中，所述二级电池保护电路包括二级电池保护电路的集成芯片U1、集成芯片U2、集成芯片U3、集成芯片U4、三极管Q1-Q2、MOS管M1-M2、整流二极管D1-D6、电容C0-C7、隧道二极管U5-U6以及电阻R1-R28；在所述二级电池保护电路中，集成芯片U1的OUT1引脚和OUT2引脚均通过电阻R17与5V电源连接；集成芯片U1的VCC引脚连接5V电源；集成芯片U1的1-引脚连接有电阻R15，电阻R15接地；集成芯片U1的1+引脚连接有电阻R27，电阻R27接地；集成芯片U1的2-引脚与大地之间连接有并联的电阻R7、电阻R8以及电容C3；且并联的电阻R7、电阻R8以及电容C3与电源端口之间连接有电阻R1；集成芯片U1的2+引脚与串联于5V电源和大地之间的电阻R19、隧道二极管U5连接；集成芯片U1的3-引脚与4+引脚连接，且集成芯片U1的3-引脚和4+引脚与电阻R27之间连接有串联的电阻R23和电阻R25；集成芯片U1的3+引脚与电阻R17连接，集成芯片U1的4-引脚与集成芯片U3连接；集成芯片U1的GND引脚接地；集成芯片U1的OUT4引脚与集成芯片U3连接，集成芯片U1的OUT3引脚连接有电阻R13；电阻R13与三极管Q1连接，三极管Q1与电源端口之间连接有并联的电容C1、电阻R2以及MOS管M1，且所述电阻R2与所述MOS管M1之间连接有并联的电阻R5和整流二极管D3；所述电源端口与大地之间连接有并联的电容C0、整流二极管D1以及整流二极管D2，且并联的电容C0、整流二极管D1以及整流二极管D2与电阻R15连接；集成芯片U2的OUT1引脚和OUT2引脚均通过电阻R18与5V电源连接；集成芯片U2的VCC引脚连接5V电源；集成芯片U1的1-引脚连接有电阻R16，电阻R16接地；集成芯片U2的1+引脚连接有电阻R28，电阻R28接地；集成芯片U2的2-引脚与大地之间连接有并联的电阻R9、电阻R10以及电容C4；且并联的电阻R9、电阻R10以及电容C4与电源端口之间连接有电阻R3；集成芯片U2的2+引脚与串联于5V电源和大地之间的电阻R20、隧道二极管U6连接；集成芯片U2的3-引脚与4+引脚连接，且集成芯片U2的3-引脚和4+引脚与电阻R28之间连接有串联的电阻R24和电阻R26；集成芯片U2的3+引脚与电阻R18连接，集成芯片U2的4-引脚与集成芯片U4连接；集成芯片U2的GND引脚接地；集成芯片U2的OUT4引脚与集成芯片U4连接，集成芯片U2的OUT3引脚连接有电阻R14；电阻R14与三极管Q1连接，三极管Q1与电源端口之间连接有并联的电容C2、电阻R4以及MOS管M2，且所述电阻R4与所述MOS管M2之间连接有并联的电阻R6和整流二极管D4；所述电源端口与大地之间连接有并联的电容C5、整流二极管D5以及整流二极管D6，且并联的电容C5、整流二极管D5以及整流二极管D6与电阻R16连接。Wherein, the secondary battery protection circuit includes an integrated chip U1, an integrated chip U2, an integrated chip U3, an integrated chip U4, transistors Q1-Q2, MOS transistors M1-M2, rectifier diodes D1-D6, and capacitors of the secondary battery protection circuit. C0-C7, tunnel diodes U5-U6 and resistors R1-R28; in the secondary battery protection circuit, the OUT1 pin and OUT2 pin of the integrated chip U1 are connected to the 5V power supply through the resistor R17; the VCC of the integrated chip U1 The pin is connected to a 5V power supply; the 1-pin of the integrated chip U1 is connected to a resistor R15, and the resistor R15 is grounded; the 1+ pin of the integrated chip U1 is connected to a resistor R27, and the resistor R27 is grounded; the 2-pin of the integrated chip U1 is connected to the ground There are parallel resistance R7, resistance R8 and capacitor C3 connected between them; and a resistance R1 is connected between the parallel resistance R7, resistance R8 and capacitor C3 and the power port; the 2+ pin of the integrated chip U1 is connected in series with the 5V power supply and The resistor R19 between the earth and the tunnel diode U5 are connected; the 3-pin of the integrated chip U1 is connected to the 4+ pin, and there is a series connection between the 3-pin and 4+ pin of the integrated chip U1 and the resistor R27 Resistor R23 and resistor R25; the 3+ pin of the integrated chip U1 is connected to the resistor R17, the 4- pin of the integrated chip U1 is connected to the integrated chip U3; the GND pin of the integrated chip U1 is grounded; the OUT4 pin of the integrated chip U1 is connected to the The integrated chip U3 is connected, and the OUT3 pin of the integrated chip U1 is connected to a resistor R13; the resistor R13 is connected to the transistor Q1, and the capacitor C1, resistor R2 and MOS tube M1 are connected in parallel between the transistor Q1 and the power port, and the resistor R2 A parallel resistor R5 and a rectifier diode D3 are connected between the MOS tube M1; a parallel capacitor C0, a rectifier diode D1, and a rectifier diode D2 are connected between the power port and the ground, and the parallel capacitor C0, rectifier diode D1 and rectifier diode D2 are connected to resistor R15; OUT1 pin and OUT2 pin of integrated chip U2 are connected to 5V power supply through resistor R18; VCC pin of integrated chip U2 is connected to 5V power supply; 1-pin of integrated chip U1 is connected to There is a resistor R16, and the resistor R16 is grounded; the 1+ pin of the integrated chip U2 is connected to a resistor R28, and the resistor R28 is grounded; the 2- pin of the integrated chip U2 is connected to the ground in parallel with a resistor R9, a resistor R10, and a capacitor C4; And resistor R3 is connected between resistor R9, resistor R10 and capacitor C4 connected in parallel with the power supply port; 2+ pin of integrated chip U2 is connected with resistor R20 and tunnel diode U6 connected in series between the 5V power supply and the ground; integrated chip U2 The 3-pin of the integrated chip U2 is connected to the 4+ pin, and the 3-pin and 4+ pin of the integrated chip U2 are connected to the resistor R28 with a series resistor R24 and a resistor R26; the 3+ pin of the integrated chip U2 is connected to the The resistor R18 is connected, and the 4-pin of the integrated chip U2 is connected to the integrated chip U4; The GND pin of the integrated chip U2 is grounded; the OUT4 pin of the integrated chip U2 is connected to the integrated chip U4, and the OUT3 pin of the integrated chip U2 is connected to a resistor R14; the resistor R14 is connected to the transistor Q1, and the transistor Q1 is connected to the power port. Capacitor C2, resistor R4, and MOS transistor M2 are connected in parallel, and a parallel resistor R6 and a rectifier diode D4 are connected between the resistor R4 and the MOS transistor M2; a parallel capacitor C5 is connected between the power port and the ground , a rectifier diode D5 and a rectifier diode D6, and the capacitor C5, the rectifier diode D5 and the rectifier diode D6 connected in parallel are connected to the resistor R16.

其中，在所述二级电池保护电路中，所述集成芯片U3的ICEXT引脚与5V电源之间连接有串联的电阻R21和电容C6，且所述集成芯片U3的IREXT引脚连接于所述电阻R21和电容C6之间；所述集成芯片U4的ICEXT引脚与5V电源之间连接有串联的电阻R22和电容C7，且所述集成芯片U4的IREXT引脚连接于所述电阻R22和电容C7之间。Wherein, in the secondary battery protection circuit, a series resistor R21 and a capacitor C6 are connected between the ICEXT pin of the integrated chip U3 and the 5V power supply, and the IREXT pin of the integrated chip U3 is connected to the Between the resistor R21 and the capacitor C6; between the ICEXT pin of the integrated chip U4 and the 5V power supply, a series resistor R22 and a capacitor C7 are connected, and the IREXT pin of the integrated chip U4 is connected to the resistor R22 and the capacitor Between C7.

有益效果：Beneficial effect:

本发明将充电、放电通路进行分离，并分别进行了独立的设计和安全保护，确保了其满足本质安全的要求，增强了整个电路的安全性和可靠性。在电池离开供电本体时，可以快速、主动的切断电路，防止在电池移动过程中，本安端子放电。该电路实现简单、可靠性高、适用范围广，可满足爆炸性环境中电子设备电池的本质安全要求。The invention separates the charging and discharging paths, and carries out independent design and safety protection respectively, which ensures that it meets the requirement of intrinsic safety and enhances the safety and reliability of the whole circuit. When the battery leaves the power supply body, it can quickly and actively cut off the circuit to prevent the intrinsically safe terminals from discharging during the battery moving process. The circuit has the advantages of simple implementation, high reliability and wide application range, and can meet the intrinsic safety requirements of electronic equipment batteries in explosive environments.

附图说明Description of drawings

为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

图1是根据本发明实施例的一种锂电池盒本安防爆电路的电路图；Fig. 1 is a circuit diagram of an intrinsically safe explosion-proof circuit of a lithium battery box according to an embodiment of the present invention;

图2是根据本发明实施例的一级电池保护电路的电路图；2 is a circuit diagram of a primary battery protection circuit according to an embodiment of the present invention;

图3是根据本发明实施例的电池断电电路的电路图；3 is a circuit diagram of a battery power-off circuit according to an embodiment of the present invention;

图4是根据本发明实施例的隔离电路的电路图；4 is a circuit diagram of an isolation circuit according to an embodiment of the present invention;

图5是根据本发明实施例的二级电池保护电路的电路图。FIG. 5 is a circuit diagram of a secondary battery protection circuit according to an embodiment of the present invention.

具体实施方式Detailed ways

下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

根据本发明的实施例，提供了一种锂电池盒本安防爆电路。According to an embodiment of the present invention, an intrinsically safe explosion-proof circuit for a lithium battery box is provided.

根据本发明实施例的一种锂电池盒本安防爆电路，包括：一级电池保护电路，与所述电池组连接，用于对电池组中的电池充放电进行过流保护、电压过欠压保护、温度保护；电池断电电路，与所述一级电池保护电路连接，用于实现电池开关断电；隔离电路，与所述电池断电电路连接，用于将电池隔离成预定电压的电源；二级电池保护电路，与所述隔离电路连接，用于对隔离电路输出的电压进行保护，实现电压安全输出。An intrinsically safe explosion-proof circuit for a lithium battery box according to an embodiment of the present invention includes: a primary battery protection circuit connected to the battery pack for overcurrent protection and voltage overvoltage and undervoltage protection for charging and discharging batteries in the battery pack Protection, temperature protection; battery power-off circuit, connected to the primary battery protection circuit, used to realize battery switch power-off; isolation circuit, connected to the battery power-off circuit, used to isolate the battery into a power supply of a predetermined voltage ; The secondary battery protection circuit is connected with the isolation circuit and is used to protect the voltage output by the isolation circuit to realize safe voltage output.

实际应用时，如图1所示，电池组首先连接一级电池保护电路，对电池充放电进行过流保护，单体电池电压过欠压保护、温度保护、防止电池损坏，一级电池保护电路与电池断电电路连接，可实现电池开关断电功能，电池断电电路与4路隔离电路连接，实现电池分成4路隔离的12V电源，4路隔离12V电源分别经二级保护电路形成4路隔离的本安输出电路，从而电池盒实现了4路本安输出电路。In actual application, as shown in Figure 1, the battery pack is first connected to the first-level battery protection circuit to perform over-current protection on battery charge and discharge, single battery voltage over-undervoltage protection, temperature protection, and prevent battery damage. The first-level battery protection circuit Connect with the battery power-off circuit to realize the power-off function of the battery switch. The battery power-off circuit is connected to the 4-way isolation circuit to realize that the battery is divided into 4-way isolated 12V power supplies. Isolated intrinsically safe output circuits, so that the battery box realizes 4 intrinsically safe output circuits.

图2是一级电池保护电路的电路图，从图2中可得知，电池组的三节单体电池经电阻R2、电阻R3、电阻R5与集成芯片U1的VC3、VC2、VC1连接，对单体电池的电压进行检测，该引脚可检测单体电池的过欠压状态，VC3引脚同时可以检测电池组的总电压，电阻R7、电阻R8、电阻R13与集成芯片U1的9、10、11引脚构成温度采集电路，集成芯片U1的6引脚和电容C6对电池欠压保护进行延迟，集成芯片U1的7引脚和电容C7对电池过压保护进行延迟。Figure 2 is the circuit diagram of the first-level battery protection circuit. It can be seen from Figure 2 that the three single cells of the battery pack are connected to VC3, VC2, and VC1 of the integrated chip U1 through resistors R2, R3, and R5. The voltage of the battery is detected. This pin can detect the overvoltage and undervoltage status of the single battery. The VC3 pin can detect the total voltage of the battery pack at the same time. The pins form a temperature acquisition circuit, the 6 pins of the integrated chip U1 and the capacitor C6 delay the battery undervoltage protection, the 7 pins of the integrated chip U1 and the capacitor C7 delay the battery overvoltage protection.

当单体电池电压过压和欠压、电池充放电电流超过10A以及电池温度超限时，集成芯片U1的4脚、1脚关断组成背靠背状态的 MOS管Q1、Q2，防止单体电池过充或过放，造成电池组的损坏，集成芯片U1的6脚和电容C6对电池欠压保护进行延迟，集成芯片U1的7脚和电容C7对电池过压保护进行延迟，电流采样电阻R14采集充放电电流，经电阻R9与集成芯片U1的5脚和8脚构成电流采集电路。When the voltage of the single battery is overvoltage or undervoltage, the charging and discharging current of the battery exceeds 10A, and the battery temperature exceeds the limit, pin 4 and pin 1 of the integrated chip U1 are turned off to form back-to-back MOS transistors Q1 and Q2 to prevent the single battery from overcharging or over-discharge, causing damage to the battery pack, the 6 pin of the integrated chip U1 and the capacitor C6 delay the battery undervoltage protection, the 7 pin of the integrated chip U1 and the capacitor C7 delay the battery overvoltage protection, and the current sampling resistor R14 collects the charge The discharge current forms a current acquisition circuit through resistor R9 and pin 5 and pin 8 of the integrated chip U1.

图3是电池断电电路的电路图，从图3中可得知，电池正极与电池断电保护板的CELL1+连接，MOS管Q1与MOS管Q2并接，减少MOS管发热，整流二极管D1与整流二极管D2防止充电倒流回MOS管Q1、Q2；MOS管Q3、Q4控制MOS管Q1、Q2导通，当开关K1、K2短接，且CELL1+与CELL-与电池连接好后，MOS管Q1与MOS管Q2导通，当开关K1、K2断开，MOS管Q1与MOS管Q2截止。传统的断电保护是通过继电器、硬开关实现电路断开，在矿用设备中开关上电易产生火花，不易过本安设计要求。Figure 3 is the circuit diagram of the battery power-off circuit. It can be seen from Figure 3 that the positive pole of the battery is connected to CELL1+ of the battery power-off protection board, and the MOS tube Q1 and MOS tube Q2 are connected in parallel to reduce the heat generation of the MOS tube. The rectifier diode D1 and the rectifier Diode D2 prevents charging from flowing back to MOS transistors Q1 and Q2; MOS transistors Q3 and Q4 control MOS transistors Q1 and Q2 to conduct. When switches K1 and K2 are shorted and CELL1+ and CELL- are connected to the battery, MOS transistor Q1 and MOS The transistor Q2 is turned on, and when the switches K1 and K2 are turned off, the MOS transistor Q1 and the MOS transistor Q2 are cut off. The traditional power-off protection is to disconnect the circuit through relays and hard switches. In mining equipment, sparks are easily generated when the switch is powered on, and it is not easy to exceed the intrinsically safe design requirements.

图4是DC转DC隔离电路，由D1与EC1组成整理滤波电路，二极管D2、R21、C2组成电源芯片启动供电电路，R11、R12、U2、R8、R9组成输入欠压保护电路，C3为缓启电容，R13、D4、EC2、变压器反馈线圈组成电源芯片启动后的供电电路，R1、R2、R3、C1、D3组成初级钳位电路，R17、R18、C6组成次级钳位电路，D6、D7、EC3组成次级整流滤波电路，R20、R22、R23、R24、R25、R26、C9、C7、C8、D8、ZD1、U4组成电压比较电路，R4、R5、R6、R7、D5、Q1、C5组成输出控制电路，R14、R15、R16、C4组成限流电路，U3、C10组成电压反馈电路。Figure 4 is a DC to DC isolation circuit, composed of D1 and EC1 to form a finishing filter circuit, diodes D2, R21, and C2 to form a power chip start-up power supply circuit, R11, R12, U2, R8, and R9 to form an input under-voltage protection circuit, and C3 as a buffer Start capacitor, R13, D4, EC2, and transformer feedback coil form the power supply circuit after the power chip starts, R1, R2, R3, C1, D3 form the primary clamp circuit, R17, R18, C6 form the secondary clamp circuit, D6, D7, EC3 form the secondary rectification filter circuit, R20, R22, R23, R24, R25, R26, C9, C7, C8, D8, ZD1, U4 form the voltage comparison circuit, R4, R5, R6, R7, D5, Q1, C5 forms an output control circuit, R14, R15, R16, and C4 form a current limiting circuit, and U3 and C10 form a voltage feedback circuit.

隔离电路工作原理如下：输入电压进入VIN端经F1保护管，首先经过供电电路激活电电源芯片U1启动，电源芯片开始监测欠压保护电路是否达到设定启机电压，达到芯片开始工作，推动输出控制电路控制变压器开始工作，变压器输出端通过整理滤波电路、钳位电路、将输出电压通过电压比较电路来调整输出电压的值，电压超过输出电压，电压反馈电路就会传感器U1、U1关掉输出控制电路，R16是限流电阻，当流经其电路大于设定值时，U1关掉输出控制电路。The working principle of the isolation circuit is as follows: the input voltage enters the VIN terminal, passes through the F1 protection tube, first activates the power supply chip U1 through the power supply circuit, and the power supply chip starts to monitor whether the undervoltage protection circuit reaches the set start-up voltage. The control circuit controls the transformer to start working. The output terminal of the transformer adjusts the value of the output voltage by sorting the filter circuit, the clamp circuit, and the output voltage through the voltage comparison circuit. If the voltage exceeds the output voltage, the voltage feedback circuit will turn off the output of the sensor U1 and U1. Control circuit, R16 is a current limiting resistor, when the current flowing through its circuit is greater than the set value, U1 turns off the output control circuit.

图5是二级电池保护电路的电路图；从图5中可得知，R19与U5构成一级保护电路基准电压，R20与U6构成二级保护电路基准电压，R1、R7、R8、C3构成一级保护电路输入电压采集电路，R3、R9、R10、C4构成二级保护电路输入电压采集电路，C1、R2、R5、D3、M1、Q1、R11、R13构成一级保护电路关断电路，C2、R4、R6、D4、M2、Q2、R12、R14构成二级保护电路关断电路，R21、C6、U3构成一级保护电路延时电路，R22、C7、U4构成二级保护电路延时电路，R23、R27、R25构成一级保护电路电电流比较电路，R24、R28、R26构成二级保护电路电电流比较电路，RV1为一级保护电路的电流采样电阻，RV2为一级保护电路的电流采样电阻，一级二级输入电压采集电路与基准电压送入比较器进行比较，当采样电路电压高于基准电压时，关断电路关断，同时触发延时电路进行延时关断（当关断期间采样电路电压低于基准电压时，仍要进行延时关断），当电流采样电阻电压高于电流比较电路电压时，关断电路关断，同时触发延时电路进行延时关断（当关断期间采样电路电压低于基准电压时，仍要进行延时关断）。C0、D1、D2构成一级保护电路滤波电路和续流电路，C5、D5、D6构成二级保护电路滤波电路和续流电路。首先通过图1的一级电池保护电路，保护电池组正常工作，保证电池组在正常参数下才能进行充放电，电池断电保护电路是电池从供电本体上取出时，立即关断输出接口，4路隔离电路是将输出的4路本安通过变压器隔离，通过变压器隔离实现4路输出电路的分离，2级保护电路是限制4路输出电路的电流、电压。Figure 5 is the circuit diagram of the secondary battery protection circuit; it can be known from Figure 5 that R19 and U5 constitute the reference voltage of the primary protection circuit, R20 and U6 constitute the reference voltage of the secondary protection circuit, and R1, R7, R8, and C3 constitute a Level protection circuit input voltage acquisition circuit, R3, R9, R10, C4 form the input voltage acquisition circuit of the second level protection circuit, C1, R2, R5, D3, M1, Q1, R11, R13 form the first level protection circuit shutdown circuit, C2 . , R23, R27, R25 constitute the electric current comparison circuit of the primary protection circuit, R24, R28, R26 constitute the electric current comparison circuit of the secondary protection circuit, RV1 is the current sampling resistor of the primary protection circuit, RV2 is the current of the primary protection circuit Sampling resistor, the primary and secondary input voltage acquisition circuit is sent to the comparator for comparison with the reference voltage, when the sampling circuit voltage is higher than the reference voltage, the shutdown circuit is turned off, and the delay circuit is triggered at the same time to delay shutdown (when the shutdown When the voltage of the sampling circuit is lower than the reference voltage during the off period, the delay shutdown is still required), when the voltage of the current sampling resistor is higher than the voltage of the current comparison circuit, the shutdown circuit is turned off, and the delay circuit is triggered at the same time to delay shutdown ( When the voltage of the sampling circuit is lower than the reference voltage during shutdown, the delay shutdown is still required). C0, D1, and D2 form the filter circuit and freewheeling circuit of the primary protection circuit, and C5, D5, and D6 form the filter circuit and freewheeling circuit of the secondary protection circuit. Firstly, through the first-level battery protection circuit in Figure 1, the normal operation of the battery pack is protected to ensure that the battery pack can only be charged and discharged under normal parameters. The battery power-off protection circuit is to immediately turn off the output interface when the battery is taken out of the power supply body. 4 The 4-way isolation circuit is to isolate the 4-way intrinsically safe output through the transformer, and realize the separation of the 4-way output circuits through transformer isolation. The 2-level protection circuit is to limit the current and voltage of the 4-way output circuits.

综上所述，借助于本发明的上述技术方案，通过将充电、放电通路进行分离，并分别进行了独立的设计和安全保护，确保了其满足本质安全的要求，增强了整个电路的安全性和可靠性。在电池离开供电本体时，可以快速、主动的切断电路，防止在电池移动过程中，本安端子放电。该电路实现简单、可靠性高、适用范围广，可满足爆炸性环境中电子设备电池的本质安全要求。To sum up, with the help of the above technical solution of the present invention, by separating the charging and discharging paths, and carrying out independent design and safety protection respectively, it is ensured that it meets the requirements of intrinsic safety, and the safety of the entire circuit is enhanced. and reliability. When the battery leaves the power supply body, it can quickly and actively cut off the circuit to prevent the intrinsically safe terminals from discharging during the battery moving process. The circuit has the advantages of simple implementation, high reliability and wide application range, and can meet the intrinsic safety requirements of electronic equipment batteries in explosive environments.

以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (7)

1. The utility model provides a lithium battery box this ampere of explosion-proof circuit, its characterized in that, lithium battery box have a plurality of group batteries, and every group battery comprises a plurality of economize on electricity batteries, lithium battery box present case explosion-proof circuit includes:
the primary battery protection circuit is connected with the battery pack and is used for performing overcurrent protection, voltage overvoltage and undervoltage protection and temperature protection on the charging and discharging of the battery in the battery pack;
the battery power-off circuit is connected with the primary battery protection circuit and used for realizing the power-off of a battery switch;
the isolation circuit is connected with the battery power-off circuit and is used for isolating the battery into a power supply with a preset voltage;
the secondary battery protection circuit is connected with the isolation circuit and used for protecting the voltage output by the isolation circuit and realizing the safe output of the voltage;
the primary battery protection circuit comprises an integrated chip U1 of the primary battery protection circuit, resistors R1-R14, a rectifier diode D1, capacitors C1-C7 and MOS (metal oxide semiconductor) tubes Q1-Q2; in the primary battery protection circuit, pins VC1-VC3 of an integrated chip U1 are respectively connected with a battery BT1, a battery BT2 and a battery BT3 through a resistor R2, a resistor R3 and a resistor R5, and a resistor R1 and a rectifier diode D1 which are connected in series are connected between a VCC pin of the integrated chip U1 and the anode of the battery pack; a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4 are respectively connected between the resistor R1, the resistor R2, the resistor R3 and the resistor R5 and the cathode of the battery pack; the TEST pin of the integrated chip U1 is grounded; a resistor R8 and a resistor R13 which are connected in series are connected between a VTC pin of the integrated chip U1 and the negative electrode of the battery pack; a VTD pin and a TS pin of the integrated chip U1 are both connected with a resistor R13, and a resistor R7 is connected between the VTD pin of the integrated chip U1 and the resistor R13; a resistor R6 and an MOS tube Q1 which are connected in series are connected between an NCDRV pin of the integrated chip U1 and the negative electrode of the battery pack, and a resistor R10 is connected between the grid electrode and the source electrode of the MOS tube Q1; a resistor R11 is connected between the VM pin of the integrated chip U1 and the negative electrode of the battery pack; a resistor R4 and an MOS tube Q2 which are connected in series are connected between the NDDRV pin of the integrated chip U1 and the negative electrode of the battery pack, and a resistor R12 is connected between the grid electrode and the source electrode of the MOS tube Q2; a resistor R9, a resistor R14 and a capacitor C5 are connected between a CS pin of the integrated chip U1 and the negative electrode of the battery pack, and the resistor R9 is connected with the capacitor C5 in parallel; a capacitor C6 and a capacitor C7 are connected between the two CUVT pins of the integrated chip U1 and the negative electrode of the battery pack respectively; and the VSS pin of the integrated chip U1 is connected with the negative electrode of the battery pack.
2. The intrinsically safe explosion-proof circuit of claim 1, wherein the lithium battery box has 1 battery pack consisting of 3 batteries, and the battery capacity of the lithium battery box is less than or equal to 100Wh.
3. The lithium battery box intrinsic safety explosion-proof circuit of claim 2, wherein the isolation circuit is a 4-way isolation circuit, and the 4-way isolation circuit divides the battery into 4 isolated 12V power supplies.
4. The lithium battery box intrinsic safety explosion-proof circuit according to claim 3, wherein the battery power-off circuit comprises MOS transistors Q1-Q4, rectifier diodes D1-D4, resistors R1-R7 and switches K1-K2;
in the battery power-off circuit, two groups of MOS (metal oxide semiconductor) tube groups are connected between the anode of the battery pack and the cathode of the battery pack, wherein one group of MOS tube group consists of an MOS tube Q1 and an MOS tube Q3 which are connected in series, and the other group of MOS tube group consists of an MOS tube Q2 and an MOS tube Q4 which are connected in series; a resistor R4 and a resistor R5 are respectively connected between the MOS tube Q1 and the MOS tube Q3 and between the MOS tube Q2 and the MOS tube Q4; a resistor R2 and a first voltage stabilizing diode which are connected in series are connected between the source electrodes of the MOS tube Q1 and the MOS tube Q3; a resistor R3 and a voltage stabilizing diode II which are connected in series are connected between the source electrodes of the MOS tube Q2 and the MOS tube Q3; rectifier diodes D1-D4 are connected between the source electrodes of the MOS tube Q1 and the MOS tube Q2 and the anode of the battery pack, wherein the rectifier diode D1 is connected with the rectifier diode D2 in parallel, and the rectifier diode D3 is connected with the rectifier diode D4 in parallel; be connected with resistance R7 and zener diode three between the negative pole of MOS pipe Q3 and MOS pipe Q4's grid and group battery, zener diode three is last to be connected with switch K1, the group battery positive pole with be connected with resistance R1 and the resistance R6 of establishing ties between the group battery negative pole, resistance R1 with be connected with switch K2 between the resistance R6.
5. The intrinsically safe explosion-proof circuit of claim 3, wherein the isolation circuit is 4 isolation circuits, and each isolation circuit is a flyback switching power supply circuit consisting of a transformer, a power chip and optocoupler feedback.
6. The lithium battery box intrinsic safety explosion-proof circuit according to claim 3, wherein the secondary battery protection circuit comprises an integrated chip U1, an integrated chip U2, an integrated chip U3, an integrated chip U4, triodes Q1-Q2, MOS (metal oxide semiconductor) tubes M1-M2, rectifier diodes D1-D6, capacitors C0-C7, tunnel diodes U5-U6 and resistors R1-R28;
in the secondary battery protection circuit, an OUT1 pin and an OUT2 pin of an integrated chip U1 are both connected with a 5V power supply through a resistor R17; a VCC pin of the integrated chip U1 is connected with a 5V power supply; a 1-pin of the integrated chip U1 is connected with a resistor R15, and the resistor R15 is grounded; a 1+ pin of the integrated chip U1 is connected with a resistor R27, and the resistor R27 is grounded; a resistor R7, a resistor R8 and a capacitor C3 which are connected in parallel are connected between the 2-pin of the integrated chip U1 and the ground; a resistor R1 is connected between the resistor R7, the resistor R8 and the capacitor C3 which are connected in parallel and the power supply port; a 2+ pin of the integrated chip U1 is connected with a resistor R19 and a tunnel diode U5 which are connected between a 5V power supply and the ground in series; a 3-pin and a 4+ pin of the integrated chip U1 are connected, and a resistor R23 and a resistor R25 which are connected in series are connected between the 3-pin and the 4+ pin of the integrated chip U1 and the resistor R27; a pin 3+ of the integrated chip U1 is connected with the resistor R17, and a pin 4-of the integrated chip U1 is connected with the integrated chip U3; a GND pin of the integrated chip U1 is grounded; the OUT4 pin of the integrated chip U1 is connected with the integrated chip U3, and the OUT3 pin of the integrated chip U1 is connected with a resistor R13; the resistor R13 is connected with the triode Q1, a capacitor C1, a resistor R2 and an MOS (metal oxide semiconductor) tube M1 which are connected in parallel are connected between the triode Q1 and a power supply port, and a resistor R5 and a rectifier diode D3 which are connected in parallel are connected between the resistor R2 and the MOS tube M1; a capacitor C0, a rectifier diode D1 and a rectifier diode D2 which are connected in parallel are connected between the power supply port and the ground, and the capacitor C0, the rectifier diode D1 and the rectifier diode D2 which are connected in parallel are connected with a resistor R15;
the OUT1 pin and the OUT2 pin of the integrated chip U2 are both connected with a 5V power supply through a resistor R18; a VCC pin of the integrated chip U2 is connected with a 5V power supply; a 1-pin of the integrated chip U1 is connected with a resistor R16, and the resistor R16 is grounded; a 1+ pin of the integrated chip U2 is connected with a resistor R28, and the resistor R28 is grounded; a resistor R9, a resistor R10 and a capacitor C4 which are connected in parallel are connected between a pin 2 of the integrated chip U2 and the ground; a resistor R3 is connected between the resistor R9, the resistor R10 and the capacitor C4 which are connected in parallel and the power port; a 2+ pin of the integrated chip U2 is connected with a resistor R20 and a tunnel diode U6 which are connected between a 5V power supply and the ground in series; a 3-pin and a 4+ pin of the integrated chip U2 are connected, and a resistor R24 and a resistor R26 which are connected in series are connected between the 3-pin and the 4+ pin of the integrated chip U2 and a resistor R28; a pin 3+ of the integrated chip U2 is connected with the resistor R18, and a pin 4-of the integrated chip U2 is connected with the integrated chip U4; the GND pin of the integrated chip U2 is grounded; the OUT4 pin of the integrated chip U2 is connected with the integrated chip U4, and the OUT3 pin of the integrated chip U2 is connected with a resistor R14; the resistor R14 is connected with the triode Q1, a capacitor C2, a resistor R4 and an MOS (metal oxide semiconductor) tube M2 which are connected in parallel are connected between the triode Q1 and a power port, and a resistor R6 and a rectifier diode D4 which are connected in parallel are connected between the resistor R4 and the MOS tube M2; a capacitor C5, a rectifier diode D5 and a rectifier diode D6 which are connected in parallel are connected between the power supply port and the ground, and the capacitor C5, the rectifier diode D5 and the rectifier diode D6 which are connected in parallel are connected with a resistor R16.
7. The lithium battery box intrinsic safety explosion-proof circuit of claim 6, wherein in the secondary battery protection circuit, a resistor R21 and a capacitor C6 which are connected in series are connected between an ICEXT pin of the integrated chip U3 and a 5V power supply, and an IREXT pin of the integrated chip U3 is connected between the resistor R21 and the capacitor C6; a resistor R22 and a capacitor C7 which are connected in series are connected between an ICEXT pin of the integrated chip U4 and a 5V power supply, and an IREXT pin of the integrated chip U4 is connected between the resistor R22 and the capacitor C7.
CN202211003106.8A 2022-08-22 2022-08-22 Intrinsic safety explosion-proof circuit of lithium battery box Active CN115085344B (en)

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Denomination of invention: A intrinsically safe explosion-proof circuit for a lithium battery box

Granted publication date: 20221115

Pledgee: Industrial and Commercial Bank of China Taiyuan Branch|China Construction Bank Corporation Taiyuan Development Zone Branch

Pledgor: SHANXI KEDA AUTOMATION CONTROL Co.,Ltd.

Registration number: Y2025140000016