CN111313490B - Method, device, medium and system for charging and discharging battery stack - Google Patents
Method, device, medium and system for charging and discharging battery stack Download PDFInfo
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- CN111313490B CN111313490B CN201811518606.9A CN201811518606A CN111313490B CN 111313490 B CN111313490 B CN 111313490B CN 201811518606 A CN201811518606 A CN 201811518606A CN 111313490 B CN111313490 B CN 111313490B
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Abstract
The application discloses a charge and discharge method, a device, a medium and a system of a battery stack, wherein the method comprises the following steps: when the target cell stack reaches a hot standby state, detecting a first operation parameter of a target cell cluster in the charging process of the target cell stack in real time; judging whether the first operation parameter meets a first preset condition or not; if so, 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 or not; and if so, discharging the target battery cluster until the stacking of the target batteries is completed. Obviously, by the method, the abuse problem of the target cell stack is solved, and therefore the safety and reliability of the target cell stack in the charge and discharge 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 scientific technology, the application of the 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 system control difficulty of the energy storage power station is improved due to the increase of the battery clusters, so that how to safely and effectively manage the charge and discharge processes of the battery clusters becomes a current research hot spot. At present, there is no effective solution to this technical problem, so it can be seen how to provide a method for charging and discharging a battery stack to improve the safety and reliability of the battery stack in the charging and discharging process, which is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention is directed to a method, an apparatus, a medium and a system for charging and discharging a battery stack, so as to ensure the safety and reliability of the battery stack during the charging and discharging process. The specific scheme is as follows:
a method of charging and discharging a battery stack, comprising:
when a target cell stack reaches a hot standby state, detecting a first operation parameter of a target cell cluster in a charging process of the target cell stack in real time; wherein the target battery cluster is any 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 or not;
and if so, discharging the target battery cluster until the stacking of the target batteries is completed.
Preferably, after the process of determining whether the first operation 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:
detecting a third operation parameter of the target battery cluster in the power-on process in real time when the target battery stack is powered on;
judging whether the third operation parameter meets a third preset condition or not;
and if yes, powering up the target battery cluster.
Preferably, the method further comprises:
detecting a fourth operation parameter of the target battery cluster in the power-down process in real time when the target battery stack is powered down;
judging whether the fourth operation parameter meets a fourth preset condition or not;
and if yes, powering down the target battery cluster.
Preferably, before the process of the target cell stack reaching the hot standby state, the method further comprises:
when the target cell stack is charged, charging a 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 and the battery cluster with the next lowest current voltage in the target battery stack meets a preset threshold value or not;
if yes, charging a battery cluster with the current voltage being the next lowest 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 cell stack is charged for the first time, judging whether a contactor of a cell cluster with the lowest voltage in the target cell stack is in a closed state or not;
if yes, charging a pre-charging circuit of the target cell stack, and judging whether the pre-charging circuit meets a third preset condition or not;
and if so, charging the target cell stack.
Preferably, the process of determining whether the contactor of the battery cluster with 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 finish startup self-checking;
if yes, 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 battery 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 the target battery stack in real time when the target battery stack reaches a hot standby state; wherein the target battery cluster is any battery cluster in the target battery stack;
the parameter judging module is used for judging whether the first operation parameter meets a first preset condition or not;
the battery cluster charging module is used for charging the target battery cluster if yes until the target battery stack 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 yes, until the stacking of the target batteries is completed.
Accordingly, the present invention also discloses a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of the charge and discharge method of a cell stack as previously disclosed.
Correspondingly, the invention also discloses a charge and discharge system of the battery stack, which comprises: the input end of the energy storage converter is connected with a target cell stack, and a control unit is arranged on a connecting branch of the energy storage converter and the target cell stack; the control unit is used for executing the following steps:
when a target cell stack reaches a hot standby state, detecting a first operation parameter of a target cell cluster in a charging process of the target cell stack in real time; wherein the target battery cluster is any 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 or not;
and if so, discharging the target battery cluster until the stacking of the target batteries is completed.
In the invention, when the target cell stack reaches the hot standby state, first, the first operation parameter of the target cell cluster in the charging process of the target cell stack is detected in real time, then, whether the first operation parameter of the target cell cluster meets a first preset condition is judged, and if the first operation parameter meets the first preset condition, the target cell cluster 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 discharging the target battery cluster if the second operation parameter meets the second preset condition until the stacking of the target batteries is completed. 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 reliability of the target cell stack in the charge and discharge process can be ensured. Correspondingly, the charge and discharge device, the medium and the system of the battery stack 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 that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
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 charge and discharge method of a battery stack according to an embodiment of the present invention;
fig. 3 is a flowchart of a charge and discharge method of a battery stack according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a charge-discharge circuit of a battery stack according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method for pre-charging a stack according to an embodiment of the present invention;
FIG. 6 is a flow chart of a method of charging a battery stack according to an embodiment of the present invention;
FIG. 7 is a flowchart of a method for powering down a battery stack according to an embodiment of the present invention;
fig. 8 is a structural diagram 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-discharge system of a battery stack according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a charge and discharge method of a battery stack, as shown in fig. 1, comprising the following steps:
step S11: when the target cell stack reaches a hot standby state, detecting a first operation parameter of a target cell cluster in the charging process of the target cell stack in real time;
the target battery cluster is any 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 so, 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 or not;
step S15: and if so, discharging the target battery cluster until the stacking of the target batteries is completed.
The target stack in this application refers to a stack composed of the cell clusters. The stacks herein may be of different types of cells, such as: lead acid batteries, alkaline batteries, lithium batteries, etc., or the stack may be replaced with a diesel engine.
It will be appreciated that when the target stack reaches a hot standby state, the current and voltage values of the target stack are increased during the process of charging the target stack, if the current and voltage values of the target stack are increased to a certain extent, if the target stack is continuously charged, serious polarization phenomenon occurs in the target stack, so that not only is the internal material of the target stack irreversibly damaged, but also the target stack is in danger of swelling and explosion.
Moreover, during the process of charging the target battery stack, the internal resistances of the battery cells in each battery cluster in the target battery stack are not equal, so that the output of the target battery stack is uneven, so in this embodiment, in order to ensure the safety of the target battery cluster during the charging process, and in order to avoid the overcharge phenomenon of the target battery cluster during the charging process, a first preset condition is set to avoid the occurrence of such phenomenon.
Specifically, when the target battery stack is charged, first, a first operation parameter of the target battery cluster in the charging process is collected, where the first operation parameter includes 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 parameters of the target battery clusters in the charging process are obtained, firstly judging whether the first operation parameters meet the first preset conditions, and if so, charging the target battery clusters until all the battery clusters in the target battery stack are charged. Obviously, the overcharge phenomenon of the target cell stack in the charging process can be avoided by the method, and the safety of the target cell stack in the charging process can also be ensured.
It is conceivable that the current value and the voltage value of the target cell stack gradually decrease as the electric energy in the target cell stack is released during the discharge of the target cell stack, and that if the current value or the voltage value of the target cell stack decreases to a certain value, the electrode active material in the target cell stack is lost if the discharge of the target cell stack is continued, so that the life of the target cell stack is shortened. Therefore, in the present embodiment, a second preset condition is set to avoid the overdischarge phenomenon of the target cell stack.
Specifically, after the second operation parameter of the target cell stack in the discharging process is obtained, firstly judging whether the second operation parameter meets a second preset condition, and discharging the target cell cluster if the second operation parameter meets the second preset condition; if the second operation parameter of the target battery cluster does not meet the second preset condition, stopping discharging the target battery cluster to avoid the overdischarge phenomenon of the target battery cluster, and obviously, by the method in the embodiment, the safety performance of the target battery stack in the charging or discharging process can be further ensured.
Moreover, 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 stability of the target battery cluster in the charging and discharging process can be ensured. It should be noted that, in practical application, since specific operation 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, which is not described herein in detail.
Obviously, by the method in the embodiment, the problem that the charging current or the discharging current of the target battery cluster is overlarge in the process of charging or discharging the target battery stack can be avoided, 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, the first operation parameter of the target cell cluster in the charging process of the target cell stack is detected in real time, then, whether the first operation parameter of the target cell cluster meets a first preset condition is determined, and if the first operation parameter meets the first preset condition, the target cell cluster 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 discharging the target battery cluster if the second operation parameter meets the second preset condition until the stacking of the target batteries is completed. Obviously, in the embodiment, the problem of abuse 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 reliability of the target cell stack in the charge and discharge process can be ensured.
Based on the above embodiment, the present embodiment further describes and optimizes the technical solution, specifically, step S12 described above: after the process of judging whether the first operation parameter meets the first preset condition, the method further comprises the following steps:
if not, limiting the charging process of the target cell stack.
It will be appreciated that when the target stack reaches a hot standby state, the current and voltage values of the target cells in the target stack may increase and the temperature of the target cells may increase during the process of charging the target stack. If the current value and the voltage value of the target battery cell rise to a certain degree, or if the temperature of the target battery cell reaches a certain threshold value, the target battery stack is continuously charged, which can cause irreversible change of the performance of the target battery cell and even cause the target battery stack to fail.
In this embodiment, if the first operation parameter of the target battery cluster does not meet the first preset condition, it is indicated that the operation 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, the potential safety hazard or failure of the target battery stack may be caused, so as to affect the safe operation of the target battery stack. Therefore, in the present embodiment, if the first operation 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 stopping charging the target battery cluster, and limiting the magnitude of 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 charge and discharge 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 of the target battery cluster in the charging process can be reduced.
In addition, if it is judged that the target cell stack is in a fault 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 external energy is cut off, so that the target cell stack is prevented from suffering greater economic loss.
Correspondingly, if the second operation parameter of the target battery cluster in the discharging process does not meet the second preset condition, the discharging process of the target battery stack can be limited, so that the safety performance of the target battery cluster in the discharging process can be ensured, and the disclosure can be seen here, and detailed description is omitted here.
Based on the above embodiments, the present embodiment further describes and optimizes a technical solution, and specifically, the method for charging and discharging a 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 so, powering up the target battery cluster.
It can be understood that if the current value or the voltage value is too large during the power-up of the target cell stack, damage may be caused to the electronic components in the target cell stack, in this embodiment, in order to further ensure the safety of the power-up process of the target cell stack, specific operation parameters of the target cell cluster in the target cell stack during the power-up process are set, that is, a third preset condition is set according to specific requirements of the target cell stack during the power-up process, and the third preset condition may be specifically adjusted according to actual situations.
Specifically, if a third operation parameter of the target battery cluster in the power-on process meets a third preset condition, the power-on of the target battery cluster can be performed; and if the third operation parameter does not meet the third preset condition, the target battery cluster is not electrified. Obviously, by the method in the embodiment, the safety performance of the target cell stack in the power-on process can be ensured, and meanwhile, the damage to electronic components in the target cell stack can be avoided.
Based on the above embodiments, the present embodiment further describes and optimizes a technical solution, and specifically, the method for charging and discharging a battery stack further includes:
when the target battery stack is powered down, fourth operation parameters of the target battery cluster in the power-down process are detected in real time;
judging whether the fourth operation parameter meets a fourth preset condition;
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 are damaged, so in this embodiment, a fourth preset condition is set according to the limiting condition of the specific operation parameters 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 operation parameter of the target cell stack in the power-down process meets a fourth preset condition, powering down the target cell cluster; if the fourth operation parameter does not meet the fourth preset condition, the fault of the target cell stack is indicated, 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 misjudgment on the judgment result caused by the fact that the instantaneous current value or the voltage value of the target cell stack is too large, a time threshold can be set for the duration 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 embodiment, the safety of the target cell stack in the power-down process can be ensured.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, as shown in fig. 2, specifically, the steps described above: before the process when the target cell stack reaches the hot standby state, further comprising:
step S01: when the target cell stack is charged, charging a 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 and the battery cluster with the next lowest current voltage in the target battery stack meets a preset threshold value or not;
step S03: if so, charging the battery cluster with the current voltage being the next lowest in the target battery stack;
step S04: and repeatedly executing 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 will be appreciated that the difference in differential pressure between the different clusters in the target stack during the process of charging the target stack before the target stack reaches the hot standby state may cause excessive rush current, thereby affecting the safe operating performance of the target stack. Therefore, in the present embodiment, a method for charging different battery clusters in a target battery stack step by step is provided, so as to avoid the problem of damage to each electronic component in the target battery stack caused by excessive pressure difference of different battery clusters in the process of charging the target battery stack.
Based on the above embodiment, this embodiment further describes and optimizes the technical solution, as shown in fig. 3, specifically, step S01 described above: when the target cell stack is charged, before the process of charging the cell cluster with the lowest current voltage in the target cell stack, the method further comprises the following steps:
step H01: when the target cell stack is charged for the first time, judging whether a contactor of a cell cluster with the lowest voltage in the target cell stack is in a closed state or not;
step H02: if so, charging a pre-charging circuit of the target cell 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 for the first time by a large current, a method for pre-charging the target cell stack is provided.
That is, if the battery cluster with the lowest voltage in the target battery stack is in the closed state, the contact of the battery cluster with the lowest voltage in the target battery stack is in the closed state, which indicates that the charging circuit in the target battery stack is in the conducting state, and then the pre-charging circuit of the target battery stack is charged, so as to avoid damage to the electronic component caused by the moment that the target battery stack is powered on.
Then, when the pre-charge circuit of the target cell stack reaches the third preset condition, it is indicated that the pre-charge circuit of the target cell stack is already charged, and at this time, the target cell stack can be charged. Specifically, the third preset condition may be set such that the voltage difference between the contactor that has been closed and the contactor that is to be closed in the pre-charging circuit is equal to or less than a preset threshold, that is, if the voltage difference between the contactor that has been closed and the contactor that is to be closed in the pre-charging circuit is equal to or less than the preset threshold, it is indicated that the pre-charging circuit has been charged.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, specifically, step H01 above: 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 or not comprises the following steps:
when the target battery stack is charged for the first time, judging whether the target battery cluster can finish startup self-checking;
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 is indicated that each functional component in the target cell stack is in a normal running state. At this time, the subsequent process steps may be continued on the target cell stack to complete the charging process of the target cell stack. And if the target battery cluster cannot complete the startup self-test, indicating that the target battery stack is in a fault state. At this time, the worker can repair and process the target cell stack to ensure safe operation of the target cell stack.
Based on the above, this embodiment is described by a specific stack charge-discharge circuit. As shown in fig. 4, one end of the energy storage converter is connected with the transformer, the other end is connected with N battery clusters, namely, the battery stack in parallel, and a circuit breaker, a fuse, a contactor, a control unit for regulating and controlling the charge and discharge processes of the battery stack and a detector for detecting the current value and the voltage value on the connection branch are arranged 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 converter system (Power Conversion System, PCS).
In practical application, a battery module and a high-voltage distribution box are disposed in each battery cluster of the battery stack, and a contactor and a battery management system motherboard are disposed in the high-voltage distribution box. It is conceivable that the contactor in the high voltage distribution box is used for controlling the on or off of the battery module connected with the high voltage distribution box, and the battery management system main board 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, regulating and controlling the charge and discharge process of the battery stack and processing faults through communication with the control unit, that is, the battery management system main board can be equivalent to a battery management system (Battery Management System, BMS).
In fig. 4, for normal operation of the energy storage converter, current impact caused by overlarge voltage difference values of different battery clusters in the battery stack in the closing process of the battery stack and inter-cluster circulation caused by different states of different battery clusters in the using process are prevented, and the charging and discharging processes of the battery clusters can be divided into: a pre-charge and first cell cluster power-up stage, a cell stack power-up stage, a discharge loop control stage, and a cell stack power-down stage.
In connection with the flowchart in fig. 5, when power-up is required to be performed on the first cluster in the stack, the PCS first supplies power to the BMS to perform a wake-up operation on the BMS in the stack, and sends a contactor command to the BMS to attract the lowest voltage cluster in the stack. When the BMS finishes the awakening operation, the BMS performs boot self-checking to judge whether a fault exists in the BMS, if the BMS finds the fault in the self-checking process, fault information is reported to the PCS, if the BMS finishes the boot self-checking, whether a contactor instruction of a battery cluster with the lowest voltage value in an actuation battery stack sent by the PCS to the BMS is received is judged, if the contactor instruction is received, the contactor of the battery cluster with the lowest voltage value in the battery stack is actuated, and the actuation 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 suction state, if not, the PCS continuously sends a contactor instruction of the battery cluster with the lowest suction voltage to the BMS; if yes, closing a 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 a pre-charging circuit of the battery stack meets a preset value, if yes, indicating that the pre-charging circuit of the battery stack is successful, at this time, closing the contactor on a connecting branch by the PCS to pre-charge the battery stack, wherein in the process, in order to ensure safe operation of the battery stack, closing the contactor is delayed for a preset time, and then opening the contactor in the control unit to finish the pre-charging process of the battery stack.
In conjunction with the flowchart in fig. 6, when the power-up of the nth battery cluster in the battery stack is completed, 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 operation parameters of each battery cluster in the battery stack are sent to the PCS, when the PCS receives the operation parameters of each battery cluster in the battery stack sent by the BMS, the operation parameters of all battery clusters are analyzed, and an instruction of engaging the contactor is sent to the battery cluster with the lowest voltage in the battery stack, so as to charge the battery cluster with the lowest voltage, and when the battery cluster with the lowest voltage receives the instruction of engaging the contactor, the contactor of the battery cluster with the lowest voltage is controlled to be engaged, and the engaging 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 the battery cluster with the lowest voltage, judging whether the voltage difference value between 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 yes, sending a closing instruction of a contactor to a battery cluster with the next low voltage in the battery stack so as to charge the battery cluster with the next low voltage; and after the contactor of the battery cluster with the next lower voltage is closed, sending the closed 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 voltage in the battery stack by the PCS until all the battery clusters in the battery stack reach the hot standby state, thereby completing the power-on process of the battery stack.
When the cell stack is discharged, judging whether the current value of a target cell cluster in the cell stack is smaller than the current limiting value of the target cell cluster, and if so, discharging the cell stack; if not, the PCS performs power-down 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. The target battery cluster is any battery cluster in the battery stack.
With reference to the flowchart in fig. 7, if the stack needs to be powered down, first, after the completion of the power-up of the stack is determined, the PCS and the BMS perform self-checking to determine whether the stack is in a normal operation state, and if the PCS and the BMS are both in the normal operation state, the PCS sends a power-down instruction of the stack to the BMS. If the BMS receives the power-down instruction 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 of the state exceeds the preset time, the battery cluster is indicated to be faulty, fault information is recorded at the moment, and the load in the battery stack is closed, so that safety accidents are avoided. If the BMS does not receive the power-down instruction sent by the PCS, judging whether the BMS is in a fault state, if so, reporting fault information to the PCS by the BMS, requesting power-down, and if the BMS receives the power-down instruction fed back by the PCS, closing the load in the battery stack and powering down. When the PCS receives a power-down request instruction of the BMS, the load in the battery cluster is closed, and the contactor on the connection branch is disconnected, so that the battery stack is powered down. Obviously, by the mode in the embodiment, the safe power-down of the battery stack is ensured.
Correspondingly, the invention also discloses a charging and discharging device of the battery stack, as shown in fig. 8, comprising:
a first detecting module 21, configured to detect, in real time, a first operating parameter of the target battery cluster during charging of the target battery stack when the target battery stack reaches a hot standby state; the target battery cluster is any battery cluster in the target battery stack;
a parameter judging module 22, configured to judge whether the first operation parameter meets a first preset condition;
the battery cluster charging module 23 is configured to charge the target battery cluster if yes, until the target battery stack is charged;
the second detection module 24 is configured to detect a second operation parameter of the target battery cluster in real time during the discharging process, 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 until the stacking of the target batteries is completed if the battery cluster is positive.
Accordingly, the present invention also discloses a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the charge and discharge method of the battery stack as previously disclosed.
Correspondingly, the embodiment of the invention also discloses a charge and discharge system of the battery stack, which comprises the following components: the input end of the energy storage converter is connected with a target cell stack, and a control unit is arranged on a connecting branch of the energy storage converter and the target cell stack; the control unit is used for executing the following steps:
when the target cell stack reaches a hot standby state, detecting a first operation parameter of a target cell cluster in the charging process of the target cell stack in real time;
the target battery cluster is any battery cluster in the target battery stack;
judging whether the first operation parameter meets a first preset condition or not;
if so, 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 or not;
and if so, discharging the target battery cluster until the stacking of the target batteries is completed.
In this embodiment, a charge and discharge system of a battery stack is disclosed, as shown in fig. 9, where the charge and discharge 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 connection leg between the energy storage converter and the target battery stack.
When the target cell stack reaches a hot standby state, the control unit detects first operation parameters of the target cell cluster in the charging process of the target cell stack in real time, judges whether the first operation parameters meet first preset conditions, and charges the target cell cluster if the first operation parameters meet the first preset conditions until the target cell stack is charged; if the target battery stack needs to be discharged, the control unit detects a second operation parameter of the target battery cluster in the discharging process in real time, and judges whether the second operation parameter of the target battery cluster meets a second preset condition, if so, the target battery cluster is discharged until the target battery stack is charged. The specific control process of the control unit to charge and discharge the target cell stack may be referred to the disclosure of the above embodiment, and will not be described herein in detail.
Obviously, in the embodiment, in the process of charging and discharging the target cell stack, the control unit limits the operation parameters of the target cell cluster in the target cell stack in the process of charging and discharging, so that the abuse problem of the target cell stack in the process of using is solved, and the safety and reliability of the target cell stack in the process of charging and discharging can be ensured.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other. Finally, it is further noted that relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The charge and discharge method, device, medium and system of the battery stack provided by the invention are described in detail, and specific examples are applied to illustrate the principles and embodiments of the invention, and the description of the above examples is only used for helping to understand the method and core ideas of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (9)
1. A method of charging and discharging a battery stack, comprising:
when a target cell stack reaches a hot standby state, detecting a first operation parameter of a target cell cluster in a charging process of the target cell stack in real time; wherein the target battery cluster is any 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 or not;
if yes, discharging the target battery cluster until the stacking of the target batteries is completed;
the process when the target cell stack reaches the hot standby state further comprises:
when the target cell stack is charged, charging a 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 and the battery cluster with the next lowest current voltage in the target battery stack meets a preset threshold value or not;
if yes, charging a battery cluster with the current voltage being the next lowest 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.
2. The method of claim 1, wherein after the determining whether the first operating parameter meets the first preset condition, further comprising:
and if not, limiting the charging process of the target cell stack.
3. The method as recited in claim 1, further comprising:
detecting a third operation parameter of the target battery cluster in the power-on process in real time when the target battery stack is powered on;
judging whether the third operation parameter meets a third preset condition or not;
and if yes, powering up the target battery cluster.
4. The method as recited in claim 1, further comprising:
detecting a fourth operation parameter of the target battery cluster in the power-down process in real time when the target battery stack is powered down;
judging whether the fourth operation parameter meets a fourth preset condition or not;
and if yes, powering down the target battery cluster.
5. The method of claim 1, wherein the process of charging the current lowest voltage cluster in the target stack when charging the target stack is preceded by:
when a target cell stack is charged for the first time, judging whether a contactor of a cell cluster with the lowest voltage in the target cell stack is in a closed state or not;
if yes, charging a pre-charging circuit of the target cell stack, and judging whether the pre-charging circuit meets a third preset condition or not;
and if so, charging the target cell stack.
6. The method of claim 5, wherein the determining whether the contactor of the lowest voltage cluster in the target stack is in a closed state when the target stack is charged for the first time comprises:
when the target battery stack is charged for the first time, judging whether the target battery cluster can finish startup self-checking;
if yes, judging whether the contactor of the battery cluster with the lowest voltage in the target battery stack is in a closed state.
7. A charge and discharge apparatus of a battery stack, comprising:
the first detection module is used for detecting a first operation parameter of a target battery cluster in the charging process of the target battery stack in real time when the target battery stack reaches a hot standby state; wherein the target battery cluster is any battery cluster in the target battery stack;
the parameter judging module is used for judging whether the first operation parameter meets a first preset condition or not;
the battery cluster charging module is used for charging the target battery cluster if yes until the target battery stack 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;
the battery cluster discharging module is used for discharging the target battery cluster if yes, until the stacking of the target batteries is completed;
the process when the target cell stack reaches the hot standby state further comprises:
when the target cell stack is charged, charging a 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 and the battery cluster with the next lowest current voltage in the target battery stack meets a preset threshold value or not;
if yes, charging a battery cluster with the current voltage being the next lowest 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.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the charge-discharge method of a cell stack according to any one of claims 1 to 6.
9. A charge and discharge system of a battery stack, comprising: the input end of the energy storage converter is connected with a target cell stack, and a control unit is arranged on a connecting branch of the energy storage converter and the target cell stack; the control unit is used for executing the following steps:
when a target cell stack reaches a hot standby state, detecting a first operation parameter of a target cell cluster in a charging process of the target cell stack in real time; wherein the target battery cluster is any 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 or not;
if yes, discharging the target battery cluster until the stacking of the target batteries is completed;
the process when the target cell stack reaches the hot standby state further comprises:
when the target cell stack is charged, charging a 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 and the battery cluster with the next lowest current voltage in the target battery stack meets a preset threshold value or not;
if yes, charging a battery cluster with the current voltage being the next lowest 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.
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