CN111313490A - Charging and discharging method, device, medium and system for battery stack - Google Patents
Charging and discharging method, device, medium and system for battery stack Download PDFInfo
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- CN111313490A CN111313490A CN201811518606.9A CN201811518606A CN111313490A CN 111313490 A CN111313490 A CN 111313490A CN 201811518606 A CN201811518606 A CN 201811518606A CN 111313490 A CN111313490 A CN 111313490A
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Abstract
The application discloses a method, a device, a medium and a system for charging and discharging a battery stack, wherein the method comprises the following steps: when the target battery stack reaches a hot standby state, detecting a first operation parameter of the target battery stack in a charging process in real time; judging whether the first operation parameter meets a first preset condition or not; if yes, charging the target battery cluster until the target battery stack is charged; detecting a second operation parameter of the target battery cluster in the discharging process in real time, and judging whether the second operation parameter meets a second preset condition; and if so, discharging the target battery cluster until the target battery stack is completely charged. Obviously, by the method in the application, the abuse problem of the target cell stack is solved, so that the safety and reliability of the target cell stack in the charging and discharging process can be ensured.
Description
Technical Field
The invention relates to the technical field of energy storage power stations, in particular to a method, a device, a medium and a system for charging and discharging a battery stack.
Background
Along with the development of science and technology, the application of an energy storage power station is more and more extensive, a large number of battery clusters are needed for the construction of the energy storage power station, and the increase of the battery clusters improves the system control difficulty of the energy storage power station, so that how to manage the charging and discharging processes of the battery clusters more safely and effectively becomes a current research hotspot. At present, no effective solution to this technical problem exists, and therefore, how to provide a method for charging and discharging a battery stack to improve the safety and reliability of the battery stack during the charging and discharging process is a problem to be urgently solved by those skilled in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method, an apparatus, a medium and a system for charging and discharging a battery stack, so as to ensure safety and reliability during charging and discharging of the battery stack. The specific scheme is as follows:
a method of charging and discharging a cell stack comprising:
when a target battery stack reaches a hot standby state, detecting a first operation parameter of a target battery cluster in the charging process of the target battery stack in real time; wherein the target cell cluster is any one cell cluster in the target cell stack;
judging whether the first operation parameter meets a first preset condition or not;
if yes, charging the target battery cluster until the target battery stack is charged;
detecting a second operation parameter of the target battery cluster in the discharging process in real time, and judging whether the second operation parameter meets a second preset condition;
and if so, discharging the target battery cluster until the target battery is completely charged.
Preferably, after the process of determining whether the first operating parameter meets the first preset condition, the method further includes:
and if not, limiting the charging process of the target cell stack.
Preferably, the method further comprises the following steps:
when the target battery stack is electrified, detecting a third operation parameter of the target battery cluster in the electrifying process in real time;
judging whether the third operation parameter meets a third preset condition or not;
and if so, powering on the target battery cluster.
Preferably, the method further comprises the following steps:
when the target battery stack is powered off, detecting a fourth operation parameter of the target battery cluster in the power-off process in real time;
judging whether the fourth operation parameter meets a fourth preset condition or not;
and if so, powering down the target battery cluster.
Preferably, before the process of reaching the hot standby state, the method further includes:
when the target cell stack is charged, charging the cell cluster with the lowest current voltage in the target cell stack;
judging whether the voltage difference value between the battery cluster with the lowest current voltage in the target battery stack and the battery cluster with the next lowest current voltage meets a preset threshold value or not;
if so, charging the battery cluster with the next lower current voltage in the target battery stack;
and repeating the step of charging the battery cluster with the lowest current voltage in the target battery stack until the target battery stack reaches a hot standby state.
Preferably, before the process of charging the battery cluster with the lowest current voltage in the target battery stack when the target battery stack is charged, the method further includes:
when a target battery stack is charged for the first time, judging whether a contactor of a battery cluster with the lowest voltage in the target battery stack is in a closed state;
if yes, charging a pre-charging circuit of the target battery stack, and judging whether the pre-charging circuit meets a third preset condition;
and if so, charging the target cell stack.
Preferably, the process of determining whether a contactor of a battery cluster having the lowest voltage in the target battery stack is in a closed state when the target battery stack is charged for the first time includes:
when the target battery stack is charged for the first time, judging whether the target battery cluster can complete power-on self-test;
and if so, judging whether the contactor of the battery cluster with the lowest voltage in the target battery stack is in a closed state.
Correspondingly, the invention also discloses a charging and discharging device of the cell stack, which comprises:
the first detection module is used for detecting a first operation parameter of a target battery cluster in the charging process of a target battery stack in real time when the target battery stack reaches a hot standby state; wherein the target cell cluster is any one cell cluster in the target cell stack;
the parameter judgment module is used for judging whether the first operation parameter meets a first preset condition;
the battery cluster charging module is used for charging the target battery cluster if the target battery cluster is charged;
the second detection module is used for detecting a second operation parameter of the target battery cluster in the discharging process in real time and judging whether the second operation parameter meets a second preset condition or not;
and the battery cluster discharging module is used for discharging the target battery cluster if the target battery cluster is charged, until the target battery is charged.
Accordingly, the present invention also discloses a computer readable storage medium having a computer program stored thereon, which, when being executed by a processor, implements the steps of the method for charging and discharging a battery stack as disclosed in the foregoing.
Correspondingly, the invention also discloses a charging and discharging system of the cell stack, which comprises: the system comprises an energy storage converter, a target battery stack is connected to the input end of the energy storage converter, and a control unit is arranged on a connecting branch of the energy storage converter and the target battery stack; the control unit is used for executing the following steps:
when a target battery stack reaches a hot standby state, detecting a first operation parameter of a target battery cluster in the charging process of the target battery stack in real time; wherein the target cell cluster is any one cell cluster in the target cell stack;
judging whether the first operation parameter meets a first preset condition or not;
if yes, charging the target battery cluster until the target battery stack is charged;
detecting a second operation parameter of the target battery cluster in the discharging process in real time, and judging whether the second operation parameter meets a second preset condition;
and if so, discharging the target battery cluster until the target battery is completely charged.
Therefore, in the invention, when the target cell stack reaches the hot standby state, the first operation parameter of the target cell stack in the charging process is detected in real time, then whether the first operation parameter of the target cell stack meets the first preset condition is judged, and if the first operation parameter meets the first preset condition, the target cell stack can be charged until the target cell stack is charged. And then, detecting a second operation parameter of the target battery cluster in the discharging process in real time, judging whether the second operation parameter meets a second preset condition, and if the second operation parameter meets the second preset condition, discharging the target battery cluster until the target battery is completely charged. Obviously, in the invention, the abuse problem of the target cell stack in the use process is solved by limiting the operation parameters of the target cell cluster in the charge and discharge process, so that the safety and the reliability of the target cell stack in the charge and discharge process can be ensured. Correspondingly, the charging and discharging device, the medium and the system of the battery stack disclosed by the invention also have the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for charging and discharging a battery stack according to an embodiment of the present invention;
fig. 2 is a flowchart of another method for charging and discharging a battery stack according to an embodiment of the present invention;
fig. 3 is a flowchart of a charging and discharging method for a battery stack according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a charge and discharge circuit of a battery stack according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for pre-charging a cell stack according to an embodiment of the present invention;
fig. 6 is a flowchart of a method for charging a battery stack according to an embodiment of the present invention;
fig. 7 is a flowchart of a method for powering down a stack according to an embodiment of the present invention;
fig. 8 is a structural view of a charge and discharge device of a battery stack according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a charge and discharge system of a battery stack according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a charging and discharging method of a battery stack, which comprises the following steps of:
step S11: when the target battery stack reaches a hot standby state, detecting a first operation parameter of the target battery stack in a charging process in real time;
the target battery cluster is any one battery cluster in the target battery stack;
step S12: judging whether the first operation parameter meets a first preset condition or not;
step S13: if yes, charging the target battery cluster until the target battery stack is charged;
step S14: detecting a second operation parameter of the target battery cluster in the discharging process in real time, and judging whether the second operation parameter meets a second preset condition;
step S15: and if so, discharging the target battery cluster until the target battery stack is completely charged.
It should be noted that the target cell stack in the present application refers to a cell stack composed of cell clusters. The cell stacks here can be different types of cells, such as: lead-acid batteries, alkaline batteries, lithium batteries, etc., or the stack may also be replaced by a diesel engine.
It can be understood that when the target cell stack reaches the hot standby state, the current value and the voltage value of the target cell stack may increase during the charging process of the target cell stack, and if the current value and the voltage value of the target cell stack increase to a certain extent, if the target cell stack continues to be charged, a severe polarization phenomenon may occur inside the target cell stack, which may not only cause irreversible damage to the internal material of the target cell stack, but also may cause the target cell stack to have a risk of expansion and explosion.
Moreover, during the process of charging the target cell stack, the internal resistances of the battery cells in the respective cell clusters in the target cell stack are not equal, which may result in uneven output of the target cell stack, so in this embodiment, in order to ensure the safety of the target cell stack during the charging process and avoid the overcharge phenomenon occurring in the charging process of the target cell stack, a first preset condition is set to avoid such phenomenon.
Specifically, when the target battery stack is charged, first operation parameters of the target battery cluster in a charging process are collected, where the first operation parameters include related operation parameters such as a current value, a voltage value, a temperature value, and a resistance value of the target battery cluster in the charging process.
After the first operation parameter of the target battery cluster in the charging process is obtained, firstly, whether the first operation parameter meets a first preset condition is judged, if yes, the target battery cluster is charged until all battery clusters in the target battery stack are charged. Obviously, the method can avoid the overcharge phenomenon of the target cell stack in the charging process and also can ensure the safety of the target cell stack in the charging process.
It is conceivable that, during the discharge of the target stack, the current value and the voltage value of the target stack gradually decrease as the electric energy in the target stack is discharged, and when the current value or the voltage value of the target stack decreases to a certain value, if the discharge of the target stack is continued, the loss of the electrode active material in the target stack is caused, so that the life of the target stack is shortened. Therefore, in the present embodiment, a second preset condition is set to avoid the over-discharge phenomenon of the target cell stack.
Specifically, after a second operation parameter of the target cell stack in the discharging process is obtained, firstly, whether the second operation parameter meets a second preset condition is judged, and if the second operation parameter meets the second preset condition, the target cell cluster is discharged; if the second operating parameter of the target battery cluster does not meet the second preset condition, stopping discharging the target battery cluster to avoid the over-discharge phenomenon of the target battery cluster.
In addition, by the method in the embodiment, the uniform output of each battery cluster in the target battery stack in the charging and discharging process can be ensured, and the safety and the stability of the target battery cluster in the charging and discharging process can be ensured. It should be noted that, in practical applications, since the specific operating conditions of each cell stack are different, the first preset condition and the second preset condition may be specifically adjusted and modified according to the actual conditions, and detailed descriptions thereof are omitted here.
Obviously, by the method in the embodiment, the problem that the charging current or the discharging current of the target battery cluster is too large in the process of charging or discharging the target battery stack can be solved, so that the damage to electronic components in the target battery stack is avoided, and the safety and the reliability of the discharging process of the target battery cluster are further ensured.
It can be seen that, in this embodiment, when the target cell stack reaches the hot standby state, first, a first operation parameter of the target cell stack in the charging process is detected in real time, and then, whether the first operation parameter of the target cell stack meets a first preset condition is determined, and if the first operation parameter meets the first preset condition, the target cell stack may be charged until the target cell stack is charged. And then, detecting a second operation parameter of the target battery cluster in the discharging process in real time, judging whether the second operation parameter meets a second preset condition, and if the second operation parameter meets the second preset condition, discharging the target battery cluster until the target battery is completely charged. Obviously, in this embodiment, the abuse problem of the target cell stack in the use process is solved by limiting the operation parameters of the target cell cluster in the charge and discharge processes, so that the safety and reliability of the target cell stack in the charge and discharge processes can be ensured.
Based on the foregoing embodiments, this embodiment further describes and optimizes the technical solution, specifically, in step S12: after the process of judging whether the first operating parameter meets the first preset condition, the method further comprises the following steps:
and if not, limiting the charging process of the target cell stack.
It is understood that, when the target cell stack reaches the hot standby state, the current value and the voltage value of the target cell in the target cell stack may increase and the temperature of the target cell may increase during the charging of the target cell stack. If the current value and the voltage value of the target battery cell are increased to a certain degree or the temperature of the target battery cell reaches a certain threshold value, the target battery stack is continuously charged, so that the performance of the target battery cell is irreversibly changed, and even the target battery stack is in failure.
In this embodiment, if the first operating parameter of the target battery cluster does not satisfy the first preset condition, it indicates that the operating performance of the target battery cluster has reached the limit range of safe operation of the target battery cluster, and at this time, if the target battery cluster is continuously charged, a potential safety hazard or a fault may exist in the target battery stack, so that the safe operation of the target battery stack is affected. Therefore, in the present embodiment, if the first operating parameter of the target battery cluster does not satisfy the first preset condition, the charging process of the target battery cluster is limited to avoid the failure of the target battery stack.
It should be noted that, the process of limiting the charging process of the target battery cluster includes suspending charging of the target battery cluster, terminating charging of the target battery cluster, and limiting the current value of the target battery cluster during the charging process. Specifically, in practical application, the current value of the target battery cluster in the charging and discharging process can be adjusted by controlling the target battery cluster to perform power reduction output. Obviously, by the method in the embodiment, the probability of safety accidents occurring in the charging process of the target battery cluster can be reduced.
In addition, if it is determined that the target cell stack is in a failure state during the charging process, the charging of the target cell stack is stopped, that is, the transmission process of the target cell stack and the external energy is cut off, so as to prevent the target cell stack from suffering a greater economic loss.
Correspondingly, if the second operating parameter of the target battery cluster in the discharging process does not satisfy the second preset condition, the discharging process of the target battery stack may also be limited, so as to ensure the safety performance of the target battery cluster in the discharging process, which is referred to in the above disclosure and is not described herein again in detail.
Based on the foregoing embodiments, this embodiment further describes and optimizes the technical solution, and specifically, the method for charging and discharging the battery stack further includes:
when the target battery stack is electrified, detecting a third operation parameter of the target battery cluster in the electrifying process in real time;
judging whether the third operation parameter meets a third preset condition or not;
if yes, the target battery cluster is powered on.
It can be understood that, if the current value or the voltage value is too large when the target cell stack is powered on, the electronic components in the target cell stack may be damaged, in this embodiment, in order to further ensure the safety of the target cell stack in the power-on process, specific operating parameters of the target cell cluster in the target cell stack in the power-on process are also set, that is, a third preset condition is set according to specific requirements of the target cell stack in the power-on process, and the third preset condition may also be specifically adjusted according to an actual situation.
Specifically, if a third operating parameter of the target battery cluster in the power-on process meets a third preset condition, the target battery cluster can be powered on; and if the third operation parameter does not meet the third preset condition, not electrifying the target battery cluster. Obviously, by the method in the embodiment, not only can the safety performance of the target cell stack in the power-on process be ensured, but also the damage to electronic components in the target cell stack can be avoided.
Based on the foregoing embodiments, this embodiment further describes and optimizes the technical solution, and specifically, the method for charging and discharging the battery stack further includes:
when the target battery stack is powered off, detecting a fourth operation parameter of the target battery cluster in the power-off process in real time;
judging whether the fourth operation parameter meets a fourth preset condition or not;
if so, powering down the target battery cluster.
It is conceivable that, during the power-down process of the target cell stack, if the voltage value or the current value is too large, the electronic components in the target cell stack may also be damaged, so in this embodiment, a fourth preset condition is further set according to the limiting condition of the specific operating parameter of the target cell stack during the power-down process, that is, the fourth preset condition may be specifically adjusted according to the actual situation.
Specifically, if a fourth operating parameter of the target cell stack in the power-down process meets a fourth preset condition, the target cell cluster is powered down; if the fourth operation parameter does not satisfy the fourth preset condition, the target cell stack is failed, and at the moment, early warning information can be prompted, so that a worker can timely know the current operation state of the target cell stack, and the worker can be reminded to timely close the load in the target cell stack, so that the probability of safety accidents is reduced.
In addition, in practical application, in order to avoid erroneous judgment of the judgment result due to the fact that the instantaneous current value or the voltage value of the target cell stack is too large, a time threshold value can be set for the duration of time that the target cell stack does not meet the fourth preset condition, so that the stability and the accuracy of the judgment result are further improved. Obviously, by the method in the present embodiment, the safety of the target cell stack during the power-down process can be ensured.
Based on the above embodiments, this embodiment further describes and optimizes the technical solution, as shown in fig. 2, specifically, the steps are as follows: before the process when the target cell stack reaches the hot standby state, the method further comprises the following steps:
step S01: when charging the target cell stack, charging the cell cluster with the lowest current voltage in the target cell stack;
step S02: judging whether the voltage difference value between the battery cluster with the lowest current voltage in the target battery stack and the battery cluster with the next lowest current voltage meets a preset threshold value or not;
step S03: if so, charging the battery cluster with the next lower current voltage in the target battery stack;
step S04: and repeating the step of charging the battery cluster with the lowest current voltage in the target battery stack until the target battery stack reaches a hot standby state.
It is understood that, before the target cell stack reaches the hot standby state, during the charging of the target cell stack, the difference in the voltage difference between different cell clusters in the target cell stack may cause an excessive inrush current, thereby affecting the safe operation performance of the target cell stack. Therefore, in this embodiment, a method for charging different battery clusters in a target battery stack step by step is provided to avoid a problem of damage to each electronic component in the target battery stack due to an excessive voltage difference between different battery clusters during the charging process of the target battery stack.
Based on the foregoing embodiments, this embodiment further describes and optimizes the technical solution, as shown in fig. 3, specifically, in step S01: when charging the target cell stack, before the process of charging the cell cluster with the lowest current voltage in the target cell stack, the method further includes:
step H01: when the target battery stack is charged for the first time, judging whether a contactor of a battery cluster with the lowest voltage in the target battery stack is in a closed state;
step H02: if yes, charging a pre-charging circuit of the target battery stack, and judging whether the pre-charging circuit meets a third preset condition;
step H03: if so, the target cell stack is charged.
In this embodiment, in order to avoid damage to electronic components in the target cell stack when the target cell stack is charged by a large current for the first time, a method for pre-charging the target cell stack is provided.
That is, if the target cell stack is charged for the first time, it is first determined whether the contactor of the cell cluster with the lowest voltage in the target cell stack is in a closed state, and if the contactor of the cell cluster with the lowest voltage in the target cell stack is in a closed state, it indicates that the charging line in the target cell stack is in a conductive state, and then the pre-charging circuit of the target cell stack is charged, so as to avoid damage to the electronic components caused by the target cell stack at the moment of switching on the power supply.
Then, when the pre-charge circuit of the target cell stack reaches the third preset condition, which indicates that the pre-charge circuit of the target cell stack is charged, the target cell stack can be charged. Specifically, the third preset condition may be set that a voltage difference between the contactor already closed and the contactor to be closed in the pre-charging circuit is less than or equal to a preset threshold, that is, if the voltage difference between the contactor already closed and the contactor to be closed in the pre-charging circuit is less than or equal to the preset threshold, it indicates that the pre-charging circuit is charged completely.
Based on the foregoing embodiments, this embodiment further describes and optimizes the technical solution, specifically, in step H01: when the target cell stack is charged for the first time, the process of judging whether the contactor of the cell cluster with the lowest voltage in the target cell stack is in a closed state includes:
when the target battery stack is charged for the first time, judging whether the target battery cluster can complete power-on self-test;
if so, judging whether the contactor of the battery cluster with the lowest voltage in the target battery stack is in a closed state.
In this embodiment, in order to ensure the safety of the power-on process of the target cell stack, when the target cell stack is charged for the first time, it may be further determined whether the target cell cluster can complete the power-on self-test, and if the target cell cluster can complete the power-on self-test, it indicates that each functional component in the target cell stack is in a normal operating state. At this time, the subsequent process steps may be continued to be performed on the target cell stack to complete the charging process for the target cell stack. And if the target battery cluster can not finish the starting self-test, indicating that the target battery stack is in a fault state. At this time, the worker can maintain and process the target cell stack to ensure the safe operation of the target cell stack.
Based on the above description of the embodiments, the present embodiment is described with a specific stack charging and discharging circuit. As shown in fig. 4, one end of the energy storage converter is connected to the transformer, and the other end is connected in parallel to N battery clusters, that is, the battery stack, and a circuit breaker, a fuse, a contactor, a control unit for controlling the charging and discharging processes of the battery stack, and a detector for detecting the current value and the voltage value on the connection branch are disposed on the connection branch of the energy storage converter and the battery stack. In the circuit, the detector, the control unit, the fuse, the circuit breaker and the energy storage converter form an energy storage Conversion System (PCS).
In practical applications, a battery module and a high voltage distribution box are arranged in each battery cluster of the battery stack, and a contactor and a battery management system main board are arranged in the high voltage distribution box. It can be thought that the contactor in the high voltage distribution box is used for controlling the on/off of the Battery module connected with the high voltage distribution box, and the Battery Management System motherboard is used for acquiring the operation parameters reported by each component in the Battery module, estimating the operation state of the Battery module according to the operation parameters, and regulating and controlling the charging and discharging process of the Battery stack and processing faults through the communication with the control unit, that is, the Battery Management System motherboard can be equivalent to a Battery Management System (BMS).
In fig. 4, for the normal operation of the energy storage converter, the current impact caused by the overlarge voltage difference value of different battery clusters in the battery stack in the closing process of the battery stack and the inter-cluster circulation problem caused by the different battery cluster states in the using process are prevented, and the charging and discharging process of the battery cluster can be divided into: the method comprises a pre-charging and first battery cluster power-on stage, a battery stack power-on stage, a discharge circulation control stage and a battery stack power-off stage.
Referring to the flowchart of fig. 5, when the first battery cluster in the battery stack needs to be powered on, the PCS first supplies power to the BMS to wake up the BMS in the battery stack and sends a command to the BMS to pull in the contactor of the battery cluster with the lowest voltage in the battery stack. When the BMS finishes the awakening operation, the BMS performs power-on self-check to judge whether a fault exists in the BMS, if the BMS finds the fault in the self-check process, fault information is reported to the PCS, if the BMS finishes the power-on self-check, whether a contactor instruction of a battery cluster with the lowest voltage value in an attraction battery stack sent by the PCS to the BMS is received, if the instruction is received, the contactor of the battery cluster with the lowest voltage value in the battery stack is attracted, and the attraction state of the contactor of the battery cluster with the lowest voltage value is sent to the PCS. Then, the PCS judges whether the contactor of the battery cluster with the lowest voltage value is in a pull-in state, if not, the PCS continues to send a contactor instruction of the battery cluster with the lowest pull-in voltage to the BMS; if so, closing the contactor in the control unit to enable an external power supply to be connected into the battery stack, judging whether a voltage difference value between the closed contactor and the contactor to be closed in the pre-charging circuit of the battery stack meets a preset value, if so, indicating that the pre-charging circuit of the battery stack is pre-charged successfully, at the moment, closing the contactor on the connecting branch by the PCS (personal communications System) to pre-charge the battery stack, in the process, in order to ensure the safe operation of the battery stack, closing the contactor for a preset time, and then opening the contactor in the control unit to complete the pre-charging process of the battery stack.
With reference to the flowchart in fig. 6, after the nth battery cluster in the battery stack is powered on, the PCS first sends the closed state of the contactor to the BMS, when the BMS receives the closed state of the contactor sent by the PCS, the operating parameter of each battery cluster in the battery stack is sent to the PCS, when the PCS receives the operating parameter of each battery cluster in the battery stack sent by the BMS, the operating parameters of all the battery clusters are analyzed, and an instruction for attracting the contactor is sent to the battery cluster with the lowest voltage in the battery stack to charge the battery cluster with the lowest voltage, and when the battery cluster with the lowest voltage receives the instruction for attracting the contactor, the contactor of the battery cluster with the lowest voltage is controlled to attract, and the attraction state of the contactor of the battery cluster with the lowest voltage is sent to the PCS. When the PCS receives a feedback instruction of a battery cluster with the lowest voltage, judging whether the voltage difference value of the battery cluster with the lowest voltage and the battery cluster with the next lowest voltage in the battery clusters meets a preset threshold value or not; if not, the PCS starts to enter a charging state; if so, sending a closing instruction of the contactor to the battery cluster with the second lowest voltage in the battery stack to charge the battery cluster with the second lowest voltage; and after the contactor of the battery cluster with the next-lower voltage is closed, sending the closing state of the contactor of the battery cluster with the next-lower voltage to the PCS, and then, repeatedly charging the battery cluster with the lowest current voltage in the battery stack by the PCS until all the battery clusters in the battery stack reach a hot standby state, thereby completing the electrifying process of the battery stack.
When the battery stack is discharged, judging whether the current value of a target battery cluster in the battery stack is smaller than the current limiting value of the target battery cluster, if so, discharging the battery stack; if not, the PCS carries out power reduction output until the current value of the target battery cluster in the battery stack is smaller than the current limiting value of the target battery cluster. It should be noted that the target cell cluster is any one of the cell clusters in the cell stack.
Referring to the flowchart of fig. 7, if power down of the stack is required, first, after it is determined that power up of the stack is completed, the PCS and the BMS perform self-test to determine whether themselves are in a normal operation state, and if both the PCS and the BMS are in the normal operation state, the PCS sends a power down command of the stack to the BMS. And if the BMS receives a power-down command sent by the PCS, judging whether the current value of the target battery cluster is smaller than a preset current value, if so, closing the load of the battery stack, and powering down the battery stack. If the current value of the target battery cluster is larger than or equal to the preset current value and the duration time of the state exceeds the preset time, the battery cluster is indicated to have a fault, at the moment, fault information is recorded, and the load in the battery stack is closed, so that safety accidents are avoided. If the BMS does not receive the power-off command sent by the PCS, judging whether the BMS is in a fault state, if so, reporting fault information to the PCS by the BMS and requesting power-off, and when receiving the power-off command fed back by the PCS, closing the load in the battery stack and powering off. When the PCS receives a request power-down command of the BMS, the load in the battery cluster is closed, and the contactor on the connecting branch is disconnected, so that the battery stack is powered down. Obviously, by means of the embodiment, the safe power-down of the cell stack is ensured.
Correspondingly, the present invention also discloses a charging and discharging device for a battery stack, as shown in fig. 8, comprising:
the first detection module 21 is configured to detect a first operation parameter of the target cell cluster in a charging process of the target cell stack in real time when the target cell stack reaches a hot standby state; the target battery cluster is any one battery cluster in the target battery stack;
the parameter judging module 22 is configured to judge whether the first operating parameter meets a first preset condition;
the battery cluster charging module 23 is used for charging the target battery cluster if the target battery cluster is charged;
the second detection module 24 is configured to detect a second operation parameter of the target battery cluster in the discharging process in real time, and determine whether the second operation parameter meets a second preset condition;
and the battery cluster discharging module 25 is used for discharging the target battery cluster if the current is positive until the target battery is completely charged.
Accordingly, the present invention also discloses a computer readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the charging and discharging method for a battery stack as disclosed in the foregoing.
Correspondingly, the embodiment of the invention also discloses a charging and discharging system of the battery stack, which comprises: the system comprises an energy storage converter, a target battery pile is connected to the input end of the energy storage converter, and a control unit is arranged on a connecting branch of the energy storage converter and the target battery pile; the control unit is used for executing the following steps:
when the target battery stack reaches a hot standby state, detecting a first operation parameter of the target battery stack in a charging process in real time;
the target battery cluster is any one battery cluster in the target battery stack;
judging whether the first operation parameter meets a first preset condition or not;
if yes, charging the target battery cluster until the target battery stack is charged;
detecting a second operation parameter of the target battery cluster in the discharging process in real time, and judging whether the second operation parameter meets a second preset condition;
and if so, discharging the target battery cluster until the target battery stack is completely charged.
In this embodiment, a charging and discharging system of a battery stack is disclosed, as shown in fig. 9, the charging and discharging system includes an energy storage converter, a target battery stack is connected to an input end of the energy storage converter, and a control unit is disposed on a branch of the energy storage converter connected to the target battery stack.
When the target battery stack reaches a hot standby state, the control unit can detect a first operation parameter of the target battery stack in the charging process in real time and judge whether the first operation parameter meets a first preset condition, if so, the target battery stack is charged until the target battery stack is charged; and if the target battery stack needs to be discharged, the control unit can detect a second operation parameter of the target battery cluster in the discharging process in real time and judge whether the second operation parameter of the target battery cluster meets a second preset condition, and if so, the control unit discharges the target battery cluster until the target battery stack is completely charged. For a specific control process of the control unit for charging and discharging the target cell stack, reference may be made to the disclosure of the above embodiments, which are not described in detail herein.
Obviously, in this embodiment, in the process of charging and discharging the target cell stack, the control unit limits the operating parameters in the process of charging and discharging the target cell cluster in the target cell stack, so as to solve the abuse problem of the target cell stack in the use process, thereby ensuring the safety and reliability of the target cell stack in the process of charging and discharging.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The method, the device, the medium and the system for charging and discharging the cell stack provided by the invention are described in detail, the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method of charging and discharging a cell stack, comprising:
when a target battery stack reaches a hot standby state, detecting a first operation parameter of a target battery cluster in the charging process of the target battery stack in real time; wherein the target cell cluster is any one cell cluster in the target cell stack;
judging whether the first operation parameter meets a first preset condition or not;
if yes, charging the target battery cluster until the target battery stack is charged;
detecting a second operation parameter of the target battery cluster in the discharging process in real time, and judging whether the second operation parameter meets a second preset condition;
and if so, discharging the target battery cluster until the target battery is completely charged.
2. The method of claim 1, wherein the determining whether the first operating parameter satisfies a first predetermined condition is followed by:
and if not, limiting the charging process of the target cell stack.
3. The method of claim 1, further comprising:
when the target battery stack is electrified, detecting a third operation parameter of the target battery cluster in the electrifying process in real time;
judging whether the third operation parameter meets a third preset condition or not;
and if so, powering on the target battery cluster.
4. The method of claim 1, further comprising:
when the target battery stack is powered off, detecting a fourth operation parameter of the target battery cluster in the power-off process in real time;
judging whether the fourth operation parameter meets a fourth preset condition or not;
and if so, powering down the target battery cluster.
5. The method according to any one of claims 1 to 4, wherein the process of reaching the hot standby state of the target cell stack further comprises:
when the target cell stack is charged, charging the cell cluster with the lowest current voltage in the target cell stack;
judging whether the voltage difference value between the battery cluster with the lowest current voltage in the target battery stack and the battery cluster with the next lowest current voltage meets a preset threshold value or not;
if so, charging the battery cluster with the next lower current voltage in the target battery stack;
and repeating the step of charging the battery cluster with the lowest current voltage in the target battery stack until the target battery stack reaches a hot standby state.
6. The method of claim 5, wherein the charging process for the cell cluster with the lowest current voltage in the target cell stack when charging the target cell stack is preceded by:
when a target battery stack is charged for the first time, judging whether a contactor of a battery cluster with the lowest voltage in the target battery stack is in a closed state;
if yes, charging a pre-charging circuit of the target battery stack, and judging whether the pre-charging circuit meets a third preset condition;
and if so, charging the target cell stack.
7. The method according to claim 6, wherein the process of determining whether the contactor of the cell cluster having the lowest voltage in the target cell stack is in a closed state when the target cell stack is charged for the first time includes:
when the target battery stack is charged for the first time, judging whether the target battery cluster can complete power-on self-test;
and if so, judging whether the contactor of the battery cluster with the lowest voltage in the target battery stack is in a closed state.
8. A charging and discharging device for a cell stack, comprising:
the first detection module is used for detecting a first operation parameter of a target battery cluster in the charging process of a target battery stack in real time when the target battery stack reaches a hot standby state; wherein the target cell cluster is any one cell cluster in the target cell stack;
the parameter judgment module is used for judging whether the first operation parameter meets a first preset condition;
the battery cluster charging module is used for charging the target battery cluster if the target battery cluster is charged;
the second detection module is used for detecting a second operation parameter of the target battery cluster in the discharging process in real time and judging whether the second operation parameter meets a second preset condition or not;
and the battery cluster discharging module is used for discharging the target battery cluster if the target battery cluster is charged, until the target battery is charged.
9. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for charging and discharging a battery stack according to any one of claims 1 to 7.
10. A charge and discharge system for a battery stack, comprising: the system comprises an energy storage converter, a target battery stack is connected to the input end of the energy storage converter, and a control unit is arranged on a connecting branch of the energy storage converter and the target battery stack; the control unit is used for executing the following steps:
when a target battery stack reaches a hot standby state, detecting a first operation parameter of a target battery cluster in the charging process of the target battery stack in real time; wherein the target cell cluster is any one cell cluster in the target cell stack;
judging whether the first operation parameter meets a first preset condition or not;
if yes, charging the target battery cluster until the target battery stack is charged;
detecting a second operation parameter of the target battery cluster in the discharging process in real time, and judging whether the second operation parameter meets a second preset condition;
and if so, discharging the target battery cluster until the target battery is completely charged.
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