Control method, device and equipment of battery energy storage system and battery energy storage system

Abstract

The invention relates to a control method, device and equipment of a battery energy storage system and the battery energy storage system, and the method comprises the following steps: determining a to-be-treated flow battery module from a plurality of flow battery modules according to first health degrees of the plurality of flow battery modules in the battery energy storage system; obtaining a health degree difference degree value of the to-be-treated flow battery module, wherein the health degree difference degree value is used for representing a difference degree of second health degrees among battery modules in the to-be-treated flow battery module; and processing the flow battery module to be processed according to the health degree difference degree value. According to the technical scheme, the consistency of each flow battery module in the battery energy storage system can be effectively improved, so that the use performance of the battery energy storage system is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of energy storage technology, and in particular to a control method, device, equipment and battery energy storage system. Background Art

[0002] A battery energy storage system typically includes multiple flow battery modules. As the use time of the flow battery modules increases, the health of the flow battery modules may decline to varying degrees, reducing the consistency of the multiple flow battery modules in the battery energy storage system and thus reducing the performance of the battery energy storage system. Summary of the Invention

[0003] To overcome the problems existing in the related art, the present disclosure provides a control method, device, equipment and battery energy storage system.

[0004] According to a first aspect of an embodiment of the present disclosure, a control method for a battery energy storage system is provided, including:

[0005] Determining a to-be-processed flow battery module from the plurality of flow battery modules according to a first health status of the plurality of flow battery modules in the battery energy storage system;

[0006] Obtaining a health difference value of the flow battery module to be processed, where the health difference value is used to represent a difference degree of the second health between each battery module in the flow battery module to be processed;

[0007] The flow battery module to be processed is processed according to the health difference value.

[0008] Optionally, determining a to-be-processed flow battery module from the plurality of flow battery modules according to the first health status of the plurality of flow battery modules in the battery energy storage system includes:

[0009] When the first health of a target flow battery module among the multiple flow battery modules is greater than or equal to a first preset health threshold, obtaining an average of the first healths of the multiple flow battery modules;

[0010] Determine a difference between the first health mean and the first health of the target flow battery module;

[0011] When the difference is greater than or equal to a preset difference threshold, the target flow battery module is used as the flow battery module to be processed.

[0012] Optionally, determining a to-be-processed flow battery module from the plurality of flow battery modules according to the first health status of the plurality of flow battery modules in the battery energy storage system includes:

[0013] When the first health of a target flow battery module among the plurality of flow battery modules is less than a first preset health threshold, the target flow battery module is used as the flow battery module to be processed.

[0014] Optionally, processing the flow battery module to be processed according to the health difference value includes:

[0015] When the health difference value is greater than or equal to the preset difference threshold, a control instruction is sent to the battery module replacement device to enable the battery module replacement device to replace the battery module with the second lowest health in the liquid flow battery module to be processed.

[0016] Optionally, the method further includes:

[0017] When the number of replacements of the battery module with the second lowest health in the liquid flow battery module to be processed reaches a preset number, if the health difference value is greater than or equal to the preset difference threshold, a control instruction is sent to the battery module replacement device to enable the battery module replacement device to replace the liquid flow battery module to be processed.

[0018] Optionally, the method further includes:

[0019] When the flow battery module to be processed is replaced, adjusting the actual output power of the other flow battery modules so that the first power sum value of the actual output power of the other flow battery modules after adjustment is greater than or equal to the total output power of the plurality of flow battery modules before adjustment;

[0020] The other flow battery modules are flow battery modules other than the flow battery module to be processed among the multiple flow battery modules.

[0021] Optionally, adjusting the actual output power of other flow battery modules includes:

[0022] Obtaining a second power sum value of the maximum output power of other flow battery modules;

[0023] Obtaining a current total output power of the battery energy storage system, where the total output power is the sum of the actual output powers of the multiple flow battery modules;

[0024] When the second power sum is greater than or equal to the total output power, the actual output power of the other flow battery modules is adjusted so that the adjusted first power sum of the actual output power of the other flow battery modules is greater than or equal to the total output power.

[0025] Optionally, processing the flow battery module to be processed according to the health difference value includes:

[0026] When the health difference value is less than the preset difference threshold, the liquid flow battery module to be processed is processed according to the second health average, and the second health average is the average value of the second health of each battery module in the liquid flow battery module to be processed.

[0027] Optionally, processing the to-be-processed flow battery module according to the second health mean value includes:

[0028] When the second health mean is greater than or equal to a second preset health threshold, a liquid mixing operation is performed on the positive electrolyte and the negative electrolyte of the liquid flow battery module to be processed.

[0029] Optionally, processing the to-be-processed flow battery module according to the second health mean value includes:

[0030] When the second health average is less than a second preset health threshold, if the second health average is greater than or equal to a third preset health threshold, performing a liquid mixing operation on the positive electrolyte and the negative electrolyte in the flow battery module to be processed;

[0031] When the liquid mixing operation is completed, the positive electrode electrolyte and the negative electrode electrolyte are supplemented with additives or electrolyzed.

[0032] Optionally, the method further includes:

[0033] When the second health mean value is less than the third preset health threshold, the positive electrolyte and the negative electrolyte of the flow battery module to be processed are replaced.

[0034] Optionally, the method further includes:

[0035] Upon completion of processing of the flow battery module to be processed whose health difference value is less than the preset difference threshold, if the first health of the flow battery module to be processed is less than the first preset health threshold, or the difference between the first health mean and the first health of the flow battery module to be processed is greater than or equal to the preset difference threshold, sending a control instruction to the battery module replacement device so that the battery module replacement device replaces the flow battery module to be processed;

[0036] The first health mean is an average value of the first healths of the plurality of flow battery modules.

[0037] According to a second aspect of an embodiment of the present disclosure, a control device for a battery energy storage system is provided, comprising:

[0038] a determination module, configured to determine a to-be-processed flow battery module from a plurality of flow battery modules according to a first health degree of the plurality of flow battery modules in the battery energy storage system;

[0039] An acquisition module is used to obtain a health difference value of the liquid flow battery module to be processed, wherein the health difference value is used to represent the difference degree of the second health between each battery module in the liquid flow battery module to be processed;

[0040] A processing module is used to process the liquid flow battery module to be processed according to the health difference value.

[0041] According to a third aspect of an embodiment of the present disclosure, an electronic device is provided, comprising a memory and a processor, wherein a computer program is stored in the memory; the processor is configured to execute the computer program in the memory to implement the steps of the method for controlling a battery energy storage system provided in the first aspect of the present disclosure.

[0042] According to a fourth aspect of an embodiment of the present disclosure, a battery energy storage system is provided, comprising the electronic device provided by the third aspect of the present disclosure.

[0043] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: by determining a flow battery module to be processed from a plurality of flow battery modules and processing the flow battery module to be processed according to the health difference value of the flow battery module to be processed, the consistency of each flow battery module in the battery energy storage system can be effectively improved, thereby improving the performance of the battery energy storage system.

[0044] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0046] Figure 1 The figure is a flow chart of a method for controlling a battery energy storage system according to an exemplary embodiment.

[0047] Figure 2 is a schematic diagram of a battery energy storage system according to an exemplary embodiment.

[0048] Figure 3 is a block diagram of a control device for a battery energy storage system according to an exemplary embodiment.

[0049] Figure 4 The figure is a block diagram of another control device for a battery energy storage system according to an exemplary embodiment.

[0050] Figure 5 is a block diagram of another control device for a battery energy storage system according to an exemplary embodiment.

[0051] Figure 6 It is a block diagram of an electronic device according to an exemplary embodiment.

[0052] Figure 7 is a block diagram of yet another battery energy storage system according to an exemplary embodiment. DETAILED DESCRIPTION

[0053] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0054] First, the application scenario of the present disclosure is explained. The present disclosure is applied to the scenario of controlling the operation of a battery energy storage system. In this scenario, the battery energy storage system includes multiple liquid flow battery modules. As the service life of the liquid flow battery modules increases, the health of the liquid flow battery modules may decrease to varying degrees, resulting in different health levels of different liquid flow battery modules. The consistency of multiple liquid flow battery modules in the battery energy storage system is reduced, thereby reducing the performance of the battery energy storage system. Among them, the battery health (State Of Health, SOH) is also called the battery health state, battery capacity and performance state. The battery health can represent the actual capacity of the battery.

[0055] In order to solve the above problems, the present disclosure provides a control method, device, equipment and battery energy storage system for a battery energy storage system, which can effectively improve the consistency of each liquid flow battery module in the battery energy storage system, thereby improving the performance of the battery energy storage system.

[0056] The present application embodiment provides a battery energy storage system, such as Figure 2As shown, the battery energy storage system may include multiple liquid flow battery modules, for example, M liquid flow battery modules, where M is a positive integer. The multiple liquid flow battery modules may be connected in series, for example. Each liquid flow battery module may include multiple battery modules, for example, N battery modules, where N is a positive integer. Each battery module may also include multiple battery groups. For example, each battery module may include three battery groups A, B, and C.

[0057] The liquid flow battery module in the embodiment of the present application can be, for example, an all-vanadium liquid flow battery. The output power of the all-vanadium liquid flow battery depends on the size and number of the battery stacks, and its energy storage capacity depends on the capacity and concentration of the electrolyte. Therefore, the output power of the all-vanadium liquid flow battery can be increased by increasing the area of the battery stack or the number of the battery stacks, or the energy storage capacity of the all-vanadium liquid flow battery can be increased by increasing the volume of the electrolyte of the all-vanadium liquid flow battery. Furthermore, the metal ions in the electrolyte of the all-vanadium liquid flow battery are only vanadium ions, and the problem of cross-contamination of active substances in the positive electrode electrolyte and the negative electrode electrolyte will not occur.

[0058] Each battery module may, for example, include a battery stack, a positive electrode electrolyte storage tank, and a negative electrode electrolyte storage tank. The battery management system can be used to manage each battery module in the battery energy storage system. A positive electrode liquid inlet pipeline and a positive electrode liquid return pipeline may be provided between the positive electrode electrolyte storage tank and the battery stack. The positive electrode electrolyte in the positive electrode electrolyte storage tank enters the battery stack through the positive electrode liquid inlet pipeline, and then returns to the positive electrode electrolyte storage tank from the battery stack through the positive electrode liquid return pipeline; a negative electrode liquid inlet pipeline and a negative electrode liquid return pipeline are provided between the negative electrode electrolyte storage tank and the battery stack. The negative electrode electrolyte in the negative electrode electrolyte storage tank enters the battery stack through the negative electrode liquid inlet pipeline, and then returns to the negative electrode electrolyte storage tank from the battery stack through the negative electrode liquid return pipeline.

[0059] The positive electrode electrolyte and the negative electrode electrolyte can be isolated from each other by using an isolation device. The isolation device allows the balance ions in the electrolyte to freely pass through the diaphragm to maintain the overall electrical neutrality of the battery. The isolation device can also be used to isolate the positive electrode and the negative electrode from each other to prevent short circuits caused by contact between the positive electrode and the negative electrode. The isolation device can be, for example, a diaphragm, which is also called an ion exchange membrane.

[0060] In one embodiment, multiple battery modules in each battery module can share the same electrolyte system. For example, multiple battery modules in the same battery module can share the same positive electrode electrolyte storage tank, and multiple battery modules in the same battery module can share the same negative electrode electrolyte storage tank.

[0061] A positive liquid inlet pipeline and a positive liquid return pipeline may be provided between the positive electrolyte storage tank and the battery module comprising a plurality of battery modules; wherein the positive liquid inlet pipeline may include a plurality of positive liquid inlet branches, each positive liquid inlet branch corresponding to each battery module in the battery module; the positive liquid return pipeline may include a plurality of positive liquid return branches, each positive liquid return branch corresponding to each battery module in the same battery module; the positive electrolyte in the positive electrolyte storage tank enters the battery module through the positive liquid inlet branch, and then returns to the positive electrolyte storage tank from the battery stack through the positive liquid return branch.

[0062] In this way, through multiple positive liquid inlet branches, positive electrolyte can be transported from the same positive electrolyte storage tank to different battery modules in the same battery module; through multiple positive liquid return branches, different battery modules in the same battery module can recover positive electrolyte to the same positive electrolyte storage tank, which can reduce the number of positive electrolyte storage tanks.

[0063] Similarly, a negative electrode liquid inlet pipeline and a negative electrode liquid return pipeline may be provided between the negative electrode electrolyte storage tank and the battery stack including a battery module of multiple battery packs; wherein, the negative electrode liquid inlet pipeline may include multiple negative electrode liquid inlet branches, each negative electrode liquid inlet branch corresponds to each battery module in the battery module; the negative electrode liquid return pipeline may include multiple negative electrode liquid return branches, each negative electrode liquid return branch corresponds to each battery module in the same battery module; the negative electrode electrolyte in the negative electrode electrolyte storage tank enters the battery module through the negative electrode liquid inlet branch, and then returns to the negative electrode electrolyte storage tank from the battery stack through the negative electrode liquid return branch.

[0064] In this way, through multiple negative electrode liquid inlet branches, negative electrode electrolyte can be transported from the same negative electrode electrolyte storage tank to different battery modules in the same battery module; through multiple negative electrode liquid return branches, negative electrode electrolyte can be recovered from different battery modules in the same battery module by the same negative electrode electrolyte storage tank, which can reduce the number of negative electrode electrolyte storage tanks.

[0065] In one embodiment, when each battery module includes multiple battery packs, parallel electrolyte flow pipes can be set for the multiple battery packs in the same battery module, so that the flow rate of the electrolyte flowing through the multiple battery packs in the same battery module is within a preset flow rate range, thereby improving the consistency of the multiple battery packs in the same battery module, thereby helping to improve the performance of the battery energy storage system. The flow rate of the electrolyte flowing through the multiple battery packs in the same battery module can be the same, for example, and the preset flow rate range can be pre-set according to the actual needs of the battery pack.

[0066] In one embodiment, the positive electrolyte and the negative electrolyte of the battery energy storage system can be stored in the same storage tank, and the positive electrolyte and the negative electrolyte in the storage tank can be isolated from each other by a partition provided inside the storage tank.

[0067] A rotating shaft can be provided on the partition so that the partition can rotate along the rotating shaft, wherein the fixed end of the rotating shaft can be set inside the tank body to improve the sealing of the tank body, or the fixed end of the rotating shaft can also be set outside the tank body to improve the replacement efficiency of the rotating shaft.

[0068] The material of the separator or storage tank can be, for example, PVC (Polyvinyl Chloride), PC (Polycarbonate), polymethyl methacrylate, PPH (Polypropylene Homopolymer), etc., to prevent the separator or storage tank from reacting with the electrolyte.

[0069] The separator can release the mutual isolation between the positive electrode electrolyte and the negative electrode electrolyte in the storage tank by rotating along the rotation axis, so as to achieve the mixing operation between the positive electrode electrolyte and the negative electrode electrolyte in the storage tank.

[0070] The partition can also change its shape by folding, stretching, etc. For example, the partition can stretch radially along the rotation axis, or the partition can stretch axially along the rotation axis, or the partition can stretch axially and radially along the rotation axis at the same time, so as to realize the mixing operation between the positive electrode electrolyte and the negative electrode electrolyte in the storage tank.

[0071] For another example, the partition can also slide along the target direction to change the position of the partition itself, and a accommodating chamber for accommodating a heating component can be provided inside the partition; or, a heating component can also be provided on the partition, and the heating component can be, for example, a heating wire or a heating resistor. For example, through the provided heating component, the electrolyte can be heated to increase the temperature of the electrolyte when the temperature of the electrolyte is low.

[0072] In another embodiment, a accommodating chamber for accommodating a cooling component may be provided inside the partition, or a cooling component may be provided on the partition. The cooling component may be, for example, a cooling pipe for cooling by a coolant. For example, the cooling component may be provided to cool the electrolyte when the temperature of the electrolyte is high, thereby lowering the temperature of the electrolyte.

[0073] By using heating components or cooling components, the temperature of the electrolyte can be flexibly controlled, which helps to keep the temperature of the electrolyte within the optimal temperature range, thereby improving the performance of the battery energy storage system.

[0074] Figure 1 FIG. 1 is a flow chart showing a method for controlling a battery energy storage system according to an exemplary embodiment. Figure 1 As shown, the following steps are included.

[0075] Step S101: Determine a flow battery module to be processed from the plurality of flow battery modules according to a first health status of the plurality of flow battery modules in the battery energy storage system.

[0076] The health of a battery can represent the actual capacity or remaining service life of the battery. The health of a battery can be determined, for example, by determining the ratio of the capacity discharged from a fully charged state at a certain rate to a cutoff voltage to the corresponding nominal capacity of the battery, and using this ratio as the health of the battery.

[0077] For another example, the health of the battery can be determined based on the internal resistance of the battery when it leaves the factory, the current internal resistance, and the internal resistance of the battery when the battery life is exhausted; wherein, the internal resistance of the battery when it leaves the factory and the internal resistance of the battery when the battery life is exhausted can be obtained by conducting preliminary experiments on the battery; the embodiment of the present application does not constitute a limitation on the method of obtaining the health of the battery.

[0078] In one embodiment, based on the first health of multiple flow battery modules in a battery energy storage system, determining a flow battery module to be processed from the multiple flow battery modules includes: obtaining an average of the first healths of the multiple flow battery modules when the first health of a target flow battery module among the multiple flow battery modules is greater than or equal to a first preset health threshold; determining a difference between the average first health and the first health of the target flow battery module; and determining the target flow battery module as the flow battery module to be processed when the difference is greater than or equal to the preset difference threshold. The first preset health threshold can be set based on the actual situation of the flow battery module, and the first preset health threshold can be, for example, 70%.

[0079] In the embodiment of the present application, the difference between the first health mean and the first health of the target liquid flow battery module refers to the first health mean minus the first health of the target liquid flow battery module, so as to ensure that the liquid flow battery module whose first health is less than the first health mean is determined from the multiple liquid flow battery modules of the battery energy storage system.

[0080] The preset difference threshold value may be set according to actual requirements of the battery module. For example, when the first health level of the battery module is represented by a percentage, the preset difference threshold value may be 20%.

[0081] When the first health of a target liquid flow battery module among multiple liquid flow battery modules is greater than or equal to a first preset health threshold, it indicates that the health of the target liquid flow battery module itself is good. When the difference between the first health mean and the first health of the liquid flow battery module is greater than or equal to the preset difference threshold, it indicates that the first health of the liquid flow battery module is lower than the first health of other liquid flow battery modules in the battery energy storage system. The liquid flow battery module with a lower first health may affect the performance of the battery energy storage system.

[0082] In this way, the flow battery module to be processed among the multiple flow battery modules is determined based on the first health status of the multiple flow battery modules in the battery energy storage system, which can make the determined battery to be processed more accurate, so as to improve the performance of the battery energy storage system after the flow battery module to be processed is processed.

[0083] In another embodiment, based on the first health of multiple liquid flow battery modules in the battery energy storage system, determining a liquid flow battery module to be processed from multiple liquid flow battery modules includes: when the first health of a target liquid flow battery module among the multiple liquid flow battery modules is less than a first preset health threshold, using the target liquid flow battery module as the liquid flow battery module to be processed.

[0084] The first health of a target liquid flow battery module among multiple liquid flow battery modules is less than a first preset health threshold, indicating that the first health of the target liquid flow battery module is low. The liquid flow battery module whose first health is less than the first preset health threshold is used as a liquid flow battery module to be processed, so as to process the liquid flow battery group to be processed, which helps to improve the performance of the battery energy storage system.

[0085] Step S102: Obtain a health difference value of the flow battery module to be processed, where the health difference value is used to represent the difference degree of the second health between the battery modules in the flow battery module to be processed.

[0086] The liquid flow battery module to be processed includes multiple battery modules. By obtaining the health difference value of the liquid flow battery module to be processed, the difference degree of the second health between each battery module in the liquid flow battery module to be processed can be characterized, which helps to determine the consistency of the second health between each battery module in the liquid flow battery module to be processed.

[0087] The health degree difference value of the liquid flow battery module to be processed can be, for example, the mean square error or variance between the second health degrees of multiple battery modules in the battery module, or the health degree difference value of the liquid flow battery module to be processed can also be other parameters that can characterize the degree of difference in the second health degrees between each battery module in the liquid flow battery module to be processed. The embodiments of the present application do not impose any restrictions on the parameters that characterize the degree of difference in the second health degrees between each battery module in the liquid flow battery module to be processed.

[0088] For example, the lower the health difference value of the liquid flow battery module to be processed, the higher the consistency of the second health between the battery modules in the liquid flow battery module to be processed; conversely, the higher the health difference value of the liquid flow battery module to be processed, the lower the consistency of the second health between the battery modules in the liquid flow battery module to be processed.

[0089] In this way, by obtaining the health difference value of the liquid flow battery module to be processed, it is helpful to more accurately determine the reason for the low health of the liquid flow battery module to be processed, so as to better process the battery to be processed and improve the performance of the battery energy storage system.

[0090] Step S103: Process the flow battery module to be processed according to the health difference value.

[0091] Under different health difference values, different treatment methods can be used for the flow battery module to be processed. For example, if the health difference value is greater than or equal to the preset difference threshold, it means that the health difference value is high, and the flow battery module to be processed may be mainly affected by the battery module with lower health. For example, if the health difference value is less than the preset difference threshold, it means that the health difference value is low, and the health of the flow battery module to be processed may be mainly affected by the electrolyte flowing through the flow battery module to be processed. The preset difference threshold can be set according to the actual needs of the battery module.

[0092] In this way, the treatment of the flow battery module to be treated is determined according to the health difference value of the flow battery module to be treated, which can make the treatment of the flow battery module to be treated more accurate, thereby ensuring the performance of the battery energy storage system.

[0093] By using the control method for a battery energy storage system provided in an embodiment of the present application, a flow battery module to be processed is determined from a plurality of flow battery modules, and the flow battery module to be processed is processed according to the health difference value of the flow battery module to be processed. This can effectively improve the consistency of each flow battery module in the battery energy storage system, thereby improving the performance of the battery energy storage system.

[0094] In one embodiment, processing the liquid flow battery module to be processed according to the health difference value includes: when the health difference value is greater than or equal to a preset difference threshold, sending a control instruction to the battery module replacement device to enable the battery module replacement device to replace the battery module with the second lowest health in the liquid flow battery module to be processed.

[0095] When the health degree difference value is greater than or equal to the preset difference degree threshold, it means that the consistency between the second health degrees of the battery modules in the battery to be processed is poor. By sending a control instruction to the battery module replacement device, so that the battery module replacement device replaces the battery module with the lowest second health degree in the liquid flow battery module to be processed, it helps to improve the consistency between the battery modules in the liquid flow battery module to be processed, thereby improving the performance of the battery energy storage system.

[0096] After replacing the battery module with the second lowest health in the liquid flow battery module to be processed, if the health difference value of the liquid flow battery module to be processed is still greater than or equal to the preset difference threshold, the battery module with the second lowest health in the liquid flow battery module to be processed can continue to be replaced, for example, the battery module with the second lowest health in the liquid flow battery module to be processed can be replaced with a new battery module.

[0097] In this way, the health of the liquid flow battery module to be processed can be improved, the consistency of the health of each battery module in the liquid flow battery module to be processed can be improved, and the replacement of the entire liquid flow battery module to be processed can be avoided, thereby reducing the processing cost of the liquid flow battery module to be processed.

[0098] In one embodiment, when the number of times the battery module with the second lowest health in the liquid flow battery module to be processed is replaced reaches a preset number, if the health difference value is greater than or equal to the preset difference threshold, a control instruction is sent to the battery module replacement device to enable the battery module replacement device to replace the liquid flow battery module to be processed.

[0099] The preset number of times may be, for example, 3 times, or the preset number of times may be determined according to the number of battery modules in the liquid flow battery module.

[0100] By replacing the battery module with the second lowest health in the liquid flow battery module to be processed multiple times, the health difference value is still greater than or equal to the preset difference threshold, indicating that the consistency of the second health between the battery modules in the liquid flow battery module to be processed is still poor. The liquid flow battery module to be processed can be replaced with a new and unused liquid flow battery module, thereby quickly improving the health of the liquid flow battery module to be processed and improving the performance of the battery energy storage system.

[0101] In one embodiment, when the liquid flow battery module to be processed is replaced, the actual output power of other liquid flow battery modules can be adjusted so that the first power sum value of the actual output power of the other liquid flow battery modules after adjustment is greater than or equal to the total output power of the multiple liquid flow battery modules before adjustment; wherein, the other liquid flow battery modules are the liquid flow battery modules among the multiple liquid flow battery modules other than the liquid flow battery module to be processed.

[0102] For example, the battery energy storage system includes four liquid flow battery modules D, E, F, and G. The power that the battery energy storage system can output is the sum of the output powers of the four liquid flow battery modules D, E, F, and G. If the liquid flow battery module D is the liquid flow battery module to be processed, the liquid flow battery module E, the liquid flow battery module F, and the liquid flow battery module G are all other liquid flow battery modules other than the liquid flow battery module to be processed.

[0103] When the liquid flow battery module D is replaced, before the output power of each battery module in the liquid flow battery module D is adjusted, the output power of the liquid flow battery module D is P1, the output power of the battery module E is P2, the output power of the battery module F is P3, the output power of the battery module G is P4, and the output power of the battery energy storage system is P1+P2+P3+P4.

[0104] In order to ensure that the output power of the battery energy storage system at least does not decrease after the liquid flow battery module D to be processed is replaced, the output power of the liquid flow battery module E, the liquid flow battery module F and the liquid flow battery module G can be adjusted. For example, after the output power adjustment, the output power of the battery module E is K1, the output power of the battery module F is K2, and the output power of the battery module G is K3. (K1+K2+K3)≥(P1+P2+P3+P4), which can ensure that the output power of the battery energy storage system at least does not decrease after the liquid flow battery module D to be processed is replaced.

[0105] After completing the replacement of the flow battery module to be processed, the output power of other flow battery modules may also be adjusted to keep the output power of the battery energy storage system relatively stable, which will not be further described in detail in the embodiment of the present application.

[0106] In one embodiment, adjusting the actual output power of other liquid flow battery modules includes: obtaining a second power sum value of the maximum output power of other liquid flow battery modules; obtaining the current total output power of the battery energy storage system, where the total output power is the sum of the actual output powers of the multiple liquid flow battery modules; and when the second power sum value is greater than or equal to the total output power, adjusting the actual output power of other liquid flow battery modules so that the adjusted first power sum value of the actual output power of the other liquid flow battery modules is greater than or equal to the total output power.

[0107] In this way, it can be ensured that after the battery module is replaced, the output power of the battery energy storage system at least does not decrease compared to before the battery module is replaced, which is conducive to ensuring the safety of the load of the battery energy storage system.

[0108] For a battery energy storage system comprising multiple flow battery modules, to ensure that the output power of the battery energy storage system does not at least decrease after a battery module is replaced compared to before the battery module is replaced, the number of battery modules that can be replaced within the same time period can be determined based on the redundant output power of the battery energy storage system and the output power of the battery module to be replaced.

[0109] For example, the redundant output power of the battery energy storage system can be determined based on the sum of the maximum output powers currently supported by other liquid flow battery modules in the battery energy storage system and the sum of the actual output powers of multiple liquid flow battery modules in the battery energy storage system, including the liquid flow battery module to be processed. The number of battery modules that can be replaced within the same time period can be determined based on the result of rounding down the ratio of the redundant output power of the battery energy storage system to the output power of a single liquid flow battery module to be processed.

[0110] When the health degree difference value is greater than or equal to a preset difference degree threshold, the battery energy storage system can stop supplying positive electrode electrolyte or negative electrode electrolyte to the pending liquid flow battery module. The BMS (Battery Management System) of the battery energy storage system can also send a control instruction to the battery module replacement device to enable the battery module replacement device to complete the replacement of the pending liquid flow battery module in the battery energy storage system; or, a prompt message can be pushed to the user terminal or display device, and the prompt message is used to prompt the user to complete the replacement of the pending liquid flow battery module in the battery energy storage system.

[0111] In this way, the battery modules to be processed in the battery energy storage system can be replaced, thereby improving the performance of the battery energy storage system, for example, helping to increase the maximum output power or remaining service life of the battery energy storage system.

[0112] For a liquid flow battery module comprising multiple battery modules, in order to ensure that the output power of the liquid flow battery module does not at least decrease after the battery module is replaced compared to before the battery module is replaced, the number of battery modules that can be replaced within the same time period can be determined based on the redundant output power of the battery modules in the liquid flow battery module and the output power of the battery module to be replaced.

[0113] For example, the redundant output power of the liquid flow battery module can be determined based on the sum of the currently supported maximum output powers of the battery modules other than the battery module to be processed in the liquid flow battery module, and the sum of the actual output powers of multiple battery modules in the liquid flow battery module including the battery module to be processed; the number of battery modules that can be replaced within the same time period can be determined based on the rounded-down result of the ratio of the redundant output power of the liquid flow battery module to the output power of a single battery module to be processed.

[0114] In one embodiment, processing the liquid flow battery module to be processed according to the health difference value includes: when the health difference value is less than a preset difference threshold, processing the liquid flow battery module to be processed according to the second health average, and the second health average is the average value of the second health of each battery module in the liquid flow battery module to be processed.

[0115] When the health degree difference value is less than the preset difference degree threshold, it means that the second health degrees of each battery module in the liquid flow battery module to be processed are relatively close, and the second health degree level of each battery module in the liquid flow battery module to be processed can be determined by the second health degree average value; according to the second health degree average value, the liquid flow battery module to be processed is processed, and according to the second health degree level of each battery module in the liquid flow battery module to be processed, a more targeted processing method can be adopted for the liquid flow battery module to be processed.

[0116] For example, in one embodiment, processing the liquid flow battery module to be processed according to the second health average includes: when the second health average is greater than or equal to a second preset health threshold, mixing the positive electrolyte and the negative electrolyte of the liquid flow battery module to be processed.

[0117] To ensure the reaction of the positive electrode electrolyte and the negative electrode electrolyte in the battery stack, the same amount of positive electrode electrolyte and negative electrode electrolyte are usually used. As the use time of the liquid flow battery increases, part of the electrolyte may reach the second end of the isolation device from the first end of the isolation device, thereby reducing the actual power of the liquid flow battery.

[0118] If the second health mean value is greater than or equal to the second preset health threshold, the health of the flow battery module to be processed is relatively good. This may be due to inconsistent capacities of the positive and negative electrolytes, causing the health of the flow battery module to be processed to be lower than the health of battery modules other than the flow battery module to be processed in the battery energy storage system. The second preset health threshold can be set based on the actual conditions of the flow battery module.

[0119] When the second health mean is greater than or equal to the second preset health threshold, mixing the positive electrolyte and the negative electrolyte of the liquid flow battery module to be treated helps to restore the charging capacity and discharging capacity of the liquid flow battery module to be treated, thereby improving the charging capacity and discharging capacity of the battery energy storage system.

[0120] The mixing operation of the positive electrolyte and the negative electrolyte of the liquid flow battery module to be processed may include: stopping the positive electrolyte pump and the negative electrolyte pump to connect the positive electrolyte storage tank and the negative electrolyte storage tank of the liquid flow battery module, so that the positive electrolyte no longer flows into the battery stack of the liquid flow battery module, and the negative electrolyte no longer flows into the battery stack of the liquid flow battery module; starting the positive electrolyte pump and the negative electrolyte pump to make the positive electrolyte flow from the positive electrolyte storage tank into the negative electrolyte storage tank, and to make the negative electrolyte flow from the negative electrolyte storage tank into the positive electrolyte storage tank, so that the amount of electrolyte in the positive electrolyte storage tank is consistent with the amount of electrolyte in the negative electrolyte storage tank.

[0121] In one embodiment, processing the liquid flow battery module to be processed according to the second health average includes: when the second health average is less than the second preset health threshold, if the second health average is greater than or equal to the third preset health threshold, performing a mixing operation on the positive electrolyte and the negative electrolyte in the liquid flow battery module to be processed; when the mixing operation is completed, performing additive supplementation or electrolysis operation on the positive electrolyte and the negative electrolyte.

[0122] The second preset health threshold is greater than the third preset health threshold. When the second health mean is less than the second preset health threshold, if the second health mean is greater than or equal to the third preset health threshold, it indicates that the health level of the liquid flow battery module to be processed is moderate. By performing a liquid mixing operation on the positive electrolyte and the negative electrolyte in the liquid flow battery module to be processed; and after completing the liquid mixing operation, supplementing the positive electrolyte and the negative electrolyte with additives or performing an electrolysis operation on the positive electrolyte and the negative electrolyte, the electrolysis reaction between the positive electrolyte and the negative electrolyte can be promoted, and the complete replacement of the positive electrolyte and the negative electrolyte in the liquid flow battery module to be processed can be avoided, thereby reducing the processing cost of the liquid flow battery module to be processed.

[0123] In one embodiment, when the second health mean value is less than the third preset health threshold, the positive electrolyte and the negative electrolyte of the flow battery module to be processed may also be replaced.

[0124] The second health mean value is less than the third preset health threshold, indicating that the health level of the liquid flow battery module to be treated is low. Mixing the positive electrolyte and the negative electrolyte may not effectively restore the health of the liquid flow battery module to be treated. Replacing the positive electrolyte and the negative electrolyte of the liquid flow battery module to be treated can improve the charging capacity and discharging capacity of the battery energy storage system. The value of the third preset health threshold can be set according to the actual situation of the liquid flow battery module.

[0125] In one embodiment, when the processing of the liquid flow battery module to be processed whose health difference value is less than the preset difference threshold is completed, if the first health of the liquid flow battery module to be processed is less than the first preset health threshold, or the difference between the first health average and the first health of the liquid flow battery module to be processed is greater than or equal to the preset difference threshold, a control instruction is sent to the battery module replacement device to enable the battery module replacement device to replace the liquid flow battery module to be processed; the first health average is the average value of the first health of the multiple liquid flow battery modules.

[0126] For example, when the health difference value of the liquid flow battery module to be treated is less than the preset difference threshold, the positive electrolyte or negative electrolyte of the liquid flow battery module to be treated is mixed, or additives are added to the electrolyte. If the liquid flow battery module to be treated still cannot meet the usage requirements, the liquid flow battery module to be treated can be replaced, thereby effectively ensuring the performance of each liquid flow battery module in the battery energy storage system to ensure the performance of the battery energy storage system.

[0127] Figure 3 FIG1 is a block diagram of a control device 1300 for a battery energy storage system according to an exemplary embodiment. Figure 3 The control device 1300 of the battery energy storage system includes

[0128] A determination module 1301 is configured to determine a flow battery module to be processed from a plurality of flow battery modules according to a first health status of the plurality of flow battery modules in the battery energy storage system;

[0129] An acquisition module 1302 is configured to acquire a health difference value of the flow battery module to be processed, wherein the health difference value is used to represent a difference degree of the second health between each battery module in the flow battery module to be processed;

[0130] The processing module 1303 is configured to process the flow battery module to be processed according to the health difference value.

[0131] In one embodiment, the determination module 1301 is also used to obtain the first health average of multiple liquid flow battery modules when the first health of the target liquid flow battery module among the multiple liquid flow battery modules is greater than or equal to the first preset health threshold; determine the difference between the first health average and the first health of the target liquid flow battery module; and when the difference is greater than or equal to the preset difference threshold, use the target liquid flow battery module as the liquid flow battery module to be processed.

[0132] In one embodiment, the determination module 1301 is further configured to use the target flow battery module as a flow battery module to be processed when the first health of the target flow battery module among the multiple flow battery modules is less than a first preset health threshold.

[0133] In one embodiment, the processing module 1303 is also used to send a control instruction to the battery module replacement device when the health difference value is greater than or equal to a preset difference threshold, so that the battery module replacement device replaces the battery module with the second lowest health in the liquid flow battery module to be processed.

[0134] In one embodiment, the processing module 1303 is also used to send a control instruction to the battery module replacement device when the number of replacements of the battery module with the second lowest health in the liquid flow battery module to be processed reaches a preset number, if the health difference value is greater than or equal to a preset difference threshold, so that the battery module replacement device replaces the liquid flow battery module to be processed.

[0135] In one embodiment, the processing module 1303 is also used to adjust the actual output power of other liquid flow battery modules when the liquid flow battery module to be processed is replaced, so that the first power sum value of the actual output power of the other liquid flow battery modules after adjustment is greater than or equal to the total output power of the multiple liquid flow battery modules before adjustment; wherein, the other liquid flow battery modules are the liquid flow battery modules among the multiple liquid flow battery modules other than the liquid flow battery module to be processed.

[0136] In one embodiment, the processing module 1303 is further used to obtain a second power sum value of the maximum output power of other liquid flow battery modules; obtain the current total output power of the battery energy storage system, where the total output power is the sum of the actual output powers of multiple liquid flow battery modules; and when the second power sum value is greater than or equal to the total output power, adjust the actual output power of other liquid flow battery modules so that the adjusted first power sum value of the actual output power of other liquid flow battery modules is greater than or equal to the total output power.

[0137] In one embodiment, the processing module 1303 is also used to process the liquid flow battery module to be processed according to the second health average when the health difference value is less than a preset difference threshold. The second health average is the average value of the second health of each battery module in the liquid flow battery module to be processed.

[0138] In one embodiment, the processing module 1303 is further configured to perform a liquid mixing operation on the positive electrolyte and the negative electrolyte of the flow battery module to be processed when the second health mean value is greater than or equal to a second preset health threshold.

[0139] In one embodiment, the processing module 1303 is also used to perform a liquid mixing operation on the positive electrolyte and the negative electrolyte in the liquid flow battery module to be processed when the second health mean is less than the second preset health threshold, if the second health mean is greater than or equal to the third preset health threshold; after the liquid mixing operation is completed, the positive electrolyte and the negative electrolyte are supplemented with additives or electrolyzed.

[0140] In one embodiment, the processing module 1303 is further configured to replace the positive electrolyte and the negative electrolyte of the flow battery module to be processed when the second health mean value is less than a third preset health threshold.

[0141] In one embodiment, the processing module 1303 is also used to send a control instruction to the battery module replacement device to replace the flow battery module to be processed if the first health of the flow battery module to be processed is less than the first preset health threshold, or the difference between the first health average and the first health of the flow battery module to be processed is greater than or equal to the preset difference threshold, after completing the processing of the flow battery module to be processed whose health difference value is less than a preset difference threshold; the first health average is the average value of the first health of the multiple flow battery modules.

[0142] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0143] The present disclosure also provides a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, implement the steps of the control method for the battery energy storage system provided by the present disclosure.

[0144] Figure 4 700 is a block diagram of a control device 700 for a battery energy storage system according to an exemplary embodiment. For example, the device 7000 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc. Figure 4 As shown, the control device 700 of the battery energy storage system may include: a processor 701 and a memory 702. The control device 700 of the battery energy storage system may also include one or more of a multimedia component 703, an input / output (I / O) interface 704, and a communication component 705.

[0145] The processor 701 is used to control the overall operation of the battery energy storage system control device 700 to complete all or part of the steps in the above-mentioned battery energy storage system control method. The memory 702 is used to store various types of data to support the operation of the battery energy storage system control device 700. This data may include, for example, instructions for any application or method operating on the battery energy storage system control device 700, as well as application-related data such as contact information, sent and received messages, images, audio, video, etc. The memory 702 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The multimedia component 703 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in the memory 702 or transmitted via the communication component 705. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 704 provides an interface between the processor 701 and other interface modules, and the above-mentioned other interface modules can be a keyboard, a mouse, buttons, etc. These buttons can be virtual buttons or physical buttons. The communication component 705 is used for wired or wireless communication between the control device 700 of the battery energy storage system and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, is not limited here. Therefore, the corresponding communication component 705 may include: a Wi-Fi module, a Bluetooth module, an NFC module, etc.

[0146] In an exemplary embodiment, the control device 700 of the battery energy storage system can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to execute the above-mentioned battery energy storage system control method.

[0147] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided. When executed by a processor, the program instructions implement the steps of the above-described battery energy storage system control method. For example, the computer-readable storage medium may be the aforementioned memory 702 including the program instructions. The program instructions may be executed by the processor 701 of the battery energy storage system control device 700 to implement the above-described battery energy storage system control method.

[0148] In addition to being an independent electronic device, the above-mentioned device can also be a part of an independent electronic device. For example, in one embodiment, the device can be an integrated circuit (IC) or a chip, wherein the integrated circuit can be a single IC or a collection of multiple ICs; the chip can include but is not limited to the following types: GPU (Graphics Processing Unit), CPU (Central Processing Unit), FPGA (Field Programmable Gate Array), DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), SOC (System on Chip, SoC, system on chip or system-on-chip), etc. The above-mentioned integrated circuit or chip can be used to execute executable instructions (or codes) to implement the above-mentioned battery energy storage system control method. The executable instructions can be stored in the integrated circuit or chip, or can be obtained from other devices or equipment. For example, the integrated circuit or chip includes a processor, a memory, and an interface for communicating with other devices. The executable instruction can be stored in the memory, and when the executable instruction is executed by the processor, the above-mentioned battery energy storage system control method is implemented; alternatively, the integrated circuit or chip can receive the executable instruction through the interface and transmit it to the processor for execution, so as to implement the above-mentioned battery energy storage system control method.

[0149] In another exemplary embodiment, a computer program product is further provided. The computer program product includes a computer program executable by a programmable device, and the computer program has a code portion for executing the above-mentioned control method of the battery energy storage system when executed by the programmable device.

[0150] Figure 5 1 is a block diagram of a control device 1900 for a battery energy storage system according to an exemplary embodiment. For example, the device 1900 may be provided as a server. Figure 5 Device 1900 includes a processing component 1922, which further includes one or more processors, and memory resources represented by memory 1932 for storing instructions executable by processing component 1922, such as applications. The applications stored in memory 1932 may include one or more modules, each corresponding to a set of instructions. Furthermore, processing component 1922 is configured to execute the instructions to perform the above-described battery energy storage system control method.

[0151] The device 1900 may also include a power supply component 1926 configured to perform power management of the device 1900, a wired or wireless network interface 1950 configured to connect the device 1900 to a network, and an input / output interface 1958. The device 1900 may operate based on an operating system stored in the memory 1932, such as Windows Server 2003. TM , Mac OS X TM , Unix TM , Linux TM , FreeBSD TM or similar.

[0152] Figure 6 is a block diagram of an electronic device 800 according to an exemplary embodiment. Figure 6 As shown, the electronic device includes a memory 801 and a processor 802, and the memory 801 stores a computer program; the processor 802 is used to execute the computer program in the memory 801 to implement the steps of the control method of the battery energy storage system provided in the embodiment of the present application.

[0153] Figure 7 is a block diagram of a battery energy storage system 900 according to an exemplary embodiment. Figure 7 As shown, the battery energy storage system 900 includes an electronic device 800 .

[0154] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the present disclosure. This disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0155] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A control method for a battery energy storage system, characterized in that: The method comprises: Determining a to-be-processed flow battery module from the plurality of flow battery modules according to a first health status of the plurality of flow battery modules in the battery energy storage system; Obtaining a health difference value of the flow battery module to be processed, where the health difference value is used to represent a difference degree of the second health between each battery module in the flow battery module to be processed; The flow battery module to be processed is processed according to the health difference value.

2. The method according to claim 1, characterized in that The determining of a to-be-processed flow battery module from the plurality of flow battery modules according to the first health status of the plurality of flow battery modules in the battery energy storage system includes: When the first health of a target flow battery module among the multiple flow battery modules is greater than or equal to a first preset health threshold, obtaining an average of the first healths of the multiple flow battery modules; Determine a difference between the first health mean and the first health of the target flow battery module; When the difference is greater than or equal to a preset difference threshold, the target flow battery module is used as the flow battery module to be processed.

3. The method according to claim 1, characterized in that The determining of a to-be-processed flow battery module from the plurality of flow battery modules according to the first health status of the plurality of flow battery modules in the battery energy storage system includes: When the first health of a target flow battery module among the plurality of flow battery modules is less than a first preset health threshold, the target flow battery module is used as the flow battery module to be processed.

4. The method according to claim 1, wherein The processing of the flow battery module to be processed according to the health difference value includes: When the health difference value is greater than or equal to the preset difference threshold, a control instruction is sent to the battery module replacement device to enable the battery module replacement device to replace the battery module with the second lowest health among the liquid flow battery modules to be processed.

5. The method according to claim 4, characterized in that The method further comprises: When the number of replacements of the battery module with the second lowest health in the liquid flow battery module to be processed reaches a preset number, if the health difference value is greater than or equal to the preset difference threshold, a control instruction is sent to the battery module replacement device to enable the battery module replacement device to replace the liquid flow battery module to be processed.

6. The method according to claim 5, characterized in that The method further comprises: When the flow battery module to be processed is replaced, adjusting the actual output power of the other flow battery modules so that the first power sum value of the actual output power of the other flow battery modules after adjustment is greater than or equal to the total output power of the plurality of flow battery modules before adjustment; The other flow battery modules are flow battery modules other than the flow battery module to be processed among the multiple flow battery modules.

7. The method according to claim 6, characterized in that The adjusting of the actual output power of other flow battery modules includes: Obtaining a second power sum value of the maximum output power of other flow battery modules; Obtaining a current total output power of the battery energy storage system, where the total output power is the sum of the actual output powers of the multiple flow battery modules; When the second power sum is greater than or equal to the total output power, the actual output power of the other flow battery modules is adjusted so that the adjusted first power sum of the actual output power of the other flow battery modules is greater than or equal to the total output power.

8. The method according to claim 1, characterized in that The processing of the flow battery module to be processed according to the health difference value includes: When the health difference value is less than the preset difference threshold, the liquid flow battery module to be processed is processed according to the second health average, and the second health average is the average value of the second health of each battery module in the liquid flow battery module to be processed.

9. The method according to claim 8, characterized in that The processing of the to-be-processed flow battery module according to the second health mean value includes: When the second health mean is greater than or equal to a second preset health threshold, a liquid mixing operation is performed on the positive electrolyte and the negative electrolyte of the liquid flow battery module to be processed.

10. The method according to claim 8, characterized in that The processing of the to-be-processed flow battery module according to the second health mean value includes: When the second health average is less than a second preset health threshold, if the second health average is greater than or equal to a third preset health threshold, performing a liquid mixing operation on the positive electrolyte and the negative electrolyte in the flow battery module to be processed; When the liquid mixing operation is completed, the positive electrode electrolyte and the negative electrode electrolyte are supplemented with additives or electrolyzed.

11. The method according to claim 10, characterized in that The method further comprises: When the second health mean value is less than the third preset health threshold, the positive electrolyte and the negative electrolyte of the flow battery module to be processed are replaced.

12. The method according to any one of claims 8 to 11, characterized in that The method further comprises: Upon completion of processing of the flow battery module to be processed whose health difference value is less than the preset difference threshold, if the first health of the flow battery module to be processed is less than the first preset health threshold, or the difference between the first health mean and the first health of the flow battery module to be processed is greater than or equal to the preset difference threshold, sending a control instruction to the battery module replacement device so that the battery module replacement device replaces the flow battery module to be processed; The first health mean is an average value of the first healths of the plurality of flow battery modules.

13. A control device for a battery energy storage system, characterized in that: The device comprises: a determination module, configured to determine a to-be-processed flow battery module from a plurality of flow battery modules according to a first health degree of the plurality of flow battery modules in the battery energy storage system; An acquisition module is used to obtain a health difference value of the liquid flow battery module to be processed, wherein the health difference value is used to represent the difference degree of the second health between each battery module in the liquid flow battery module to be processed; A processing module is used to process the liquid flow battery module to be processed according to the health difference value.

14. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 12.

15. A battery energy storage system, characterized in that: The electronic device comprising claim 14.

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