Battery equalization maintenance method and device, electronic equipment and storage medium

Abstract

The invention discloses a battery equalization maintenance method and device, electronic equipment and a storage medium, and the method is applied to a battery management system of an energy storage system, and comprises the steps: determining a target equalization mode based on the battery state information of each battery cluster in the energy storage system; the target equalization mode comprises one of a system equalization mode and a selection equalization mode, the system equalization mode is a mode for carrying out electric quantity equalization on all battery clusters in the energy storage system, and the selection equalization mode is a mode for carrying out electric quantity equalization on part of battery clusters in the energy storage system; and sending the target equalization mode to control equipment on the alternating current side, so that the control equipment performs electric quantity equalization on the corresponding battery cluster by adopting the target equalization mode. According to the invention, a more suitable equalization mode can be determined according to the battery state of each battery cluster in the energy storage battery, so that the control equipment is prompted to carry out electric quantity equalization on the energy storage battery through the power grid, and equalization maintenance of the energy storage battery is realized.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery balancing maintenance method, device, electronic device, and storage medium. Background Art

[0002] With the development of energy storage technology, energy storage systems, as a key component of smart grid and microgrid systems, are playing an increasingly important role. In recent years, with the continuous advancement of battery technology, electrochemical energy storage technology has also continued to advance, its application scope has become increasingly broad, and its market share has continued to increase. An electrochemical energy storage system can include a DC side and an AC side, and is connected to the grid on the AC side. The DC side's main equipment is the battery, including a battery management system (BMS) and multiple battery clusters; the AC side's main equipment is the power conversion system (PCS) and transformer. A battery cluster is formed by several battery packs connected in series, and a battery pack is formed by several battery cells connected in series and / or in parallel. The BMS is used to manage each battery cell in each battery cluster, monitor the state of charge (SOC) of each battery cell, and perform balancing maintenance on each battery cluster when the SOC of the battery clusters differ significantly to maintain a balanced SOC.

[0003] In the prior art, existing battery balancing methods, such as passive balancing methods or active balancing methods, can be used to balance and control battery cells or battery packs to achieve SOC balancing of the energy storage system. Specifically, passive balancing methods use components such as resistors, capacitors, or diodes to disperse charge differences in the battery pack to achieve SOC balancing; active balancing methods use electronic controllers and switching circuits to transfer charge from high-voltage battery cells to low-voltage battery cells to achieve battery charge balancing. However, using passive balancing methods to balance SOC is inefficient, while using active balancing methods to achieve battery charge balancing is relatively complex and costly.

[0004] It should be noted that the above statements are only used to provide background technical information related to this application and do not necessarily constitute prior art. Summary of the Invention

[0005] In view of the above problems, the embodiments of the present application provide a battery balancing maintenance method, device, electronic device and storage medium, which can determine the balancing mode according to the battery status of each battery cluster in the energy storage battery, so as to prompt the control device to balance the energy storage battery through the power grid, and then achieve balanced maintenance of the energy storage battery, and the balancing maintenance efficiency is high and the cost is low.

[0006] In a first aspect, an embodiment of the present application provides a battery balancing maintenance method, which is applied to a battery management system of an energy storage system. The method includes:

[0007] Determining a target balancing mode based on battery status information of each battery cluster in the energy storage system; the target balancing mode includes one of a system balancing mode and a selective balancing mode, wherein the system balancing mode is a mode for performing charge balancing on all battery clusters in the energy storage system, and the selective balancing mode is a mode for performing charge balancing on some battery clusters in the energy storage system;

[0008] The target balancing mode is sent to a control device on the AC side, so that the control device adopts the target balancing mode to perform power balancing on the corresponding battery cluster.

[0009] The battery balancing maintenance method provided in this embodiment first determines a target balancing mode that best suits the current state of each battery cluster based on the battery status information of each battery cluster in the energy storage system. This target balancing mode is then transmitted to the AC-side control device, prompting the control device to charge the corresponding battery cluster using the target balancing mode via the power grid. This method implements power balancing maintenance for the battery clusters requiring power balancing, thereby achieving power balancing maintenance for the energy storage batteries. Furthermore, this method utilizes the power grid for charging, balancing the power of each battery cluster. Therefore, this method can be performed even during the discharge process of the battery cluster, without affecting its discharge and use. Furthermore, utilizing the power grid for power balancing maintenance is highly efficient, requires no additional hardware, and is relatively low-cost.

[0010] In some embodiments, determining the target balancing mode based on the battery status information of each battery cluster in the energy storage system includes: estimating the target battery clusters that need to be battery balanced based on the battery status information of each battery cluster in the energy storage system; and determining the target balancing mode based on the number of the target battery clusters.

[0011] In this embodiment, the target battery clusters and their number that need to be power balanced are first determined based on the battery status information of each battery cluster, and then the target balancing mode is determined based on the number of target battery clusters. Targeted power balancing maintenance can be performed on the battery cluster according to the battery status of the battery cluster to select a more appropriate balancing mode, further improve the balancing maintenance efficiency, and reduce energy waste.

[0012] In some embodiments, the method further includes: receiving a balancing instruction sent by the control device; the balancing instruction includes the number information of the target battery cluster; and in response to the balancing instruction, sending the battery power parameters of the target battery cluster to the control device, so that the control device transmits the power of the power grid to the target battery cluster based on the battery power parameters.

[0013] In this embodiment, after receiving the balancing instruction, the battery management system can first determine the target battery cluster indicated in the balancing instruction, and send the battery power parameters of the target battery cluster to the control device, so that the control device can transmit the power of the power grid to the target battery cluster based on the battery power parameters to prevent excessive power from causing damage to the battery.

[0014] In some embodiments, sending the battery power parameters of the target battery cluster to the control device in response to the balancing instruction includes: determining the target balancing mode and target battery cluster indicated by the balancing instruction in response to the balancing instruction; based on the target balancing mode, applying high voltage to the target battery cluster, and sending the battery power parameters of the target battery cluster to the control device.

[0015] In this embodiment, different high-voltage strategies can be configured for different balancing modes. Therefore, upon receiving a balancing instruction, the target balancing mode and target battery cluster indicated by the balancing instruction can be determined. Then, based on the target balancing mode, high voltage can be applied to the target battery cluster, implementing a targeted high-voltage strategy. This embodiment also transmits the battery power parameters of the target battery cluster to the control device, allowing the control device to determine the appropriate charging power based on these battery parameters. This prevents charging the battery cluster with excessive power, which could cause overheating and shorten the battery cluster's lifespan.

[0016] In some embodiments, the target balancing mode includes a system balancing mode, and the target battery cluster includes all battery clusters in the energy storage system; based on the target balancing mode, the target battery cluster is subjected to high voltage, and the battery power parameters of the target battery cluster are sent to the control device, including: determining the battery power limit corresponding to the system balancing mode based on the battery power parameters of all battery clusters in the energy storage battery; sending the battery power limit to the control device, and applying high voltage to all battery clusters in the energy storage system.

[0017] In this embodiment, the minimum power limit among the power limits corresponding to all battery clusters can be determined based on the battery power parameters of all battery clusters in the energy storage battery, and the desired minimum power limit can be used as the battery power limit corresponding to the system balancing mode. The battery power limit is then sent to the control device, so that the control device charges each battery cluster based on the battery power limit, avoiding the use of a larger power limit for a battery cluster with a smaller power limit. This can better protect the battery clusters during the charging process and increase the service life of the battery clusters. In the system balancing mode, the battery management system does not need to distinguish the specific battery clusters that need to be charged and can directly apply high voltage to all battery clusters in the energy storage system, which can reduce the time of command transmission back and forth and improve charging efficiency.

[0018] In some embodiments, the target balancing mode includes a selection balancing mode, and the target battery cluster includes some battery clusters in the energy storage system; based on the target balancing mode, the target battery cluster is subjected to high voltage, and the battery power parameters of the target battery cluster are sent to the control device, including: based on the target balancing mode, the number of the first battery cluster in the part of the battery clusters and the battery power parameters of the first battery cluster are sent to the control device, and the first battery cluster is subjected to high voltage; when the first battery cluster completes battery balancing, a battery cluster is selected from the battery clusters that have not completed battery balancing in the part of the battery clusters as a new first battery cluster, and the step of returning to sending the number and battery power parameters of the first battery cluster to the control device is executed in a loop until all the battery clusters have completed battery balancing.

[0019] In this embodiment, when the number of target battery clusters is small, selective balancing can be performed, that is, selectively balancing the battery capacity of some battery clusters in the energy storage system. When performing selective balancing, each target battery cluster can be increased in high voltage and charged one by one. After the battery capacity of the target battery cluster currently undergoing battery balancing reaches the balanced value (the difference in SOC value with other battery clusters is within a preset range), the target battery cluster currently undergoing battery balancing is reduced in high voltage, and then the next target battery cluster that has not yet completed battery balancing is increased in high voltage and charged. In this way, by increasing the high voltage and charging the target battery clusters one by one, accurate charging can be achieved, reducing energy waste, and improving the efficiency of battery balancing, especially when the number of target battery clusters is small.

[0020] In some embodiments, the method further includes: lowering the high voltage to the first battery cluster when the first battery cluster completes power balancing; lowering the high voltage to all components on the DC side of the energy storage system when all target battery clusters complete power balancing and the power balancing is continued for a preset period of time; or, upon receiving a power balancing shutdown instruction sent by the control device, lowering the high voltage to all components on the DC side of the energy storage system.

[0021] In this embodiment, when the first battery cluster completes cell balancing, the high voltage is reduced to prevent continued high voltage from causing a discharge circuit in the battery, resulting in heating and shortening battery life. In actual applications, when all target battery clusters complete cell balancing, a shutdown balancing maintenance instruction is received from the control device. At this time, the high voltage is reduced to all DC-side components to protect the DC-side electrical components. If no shutdown balancing maintenance instruction is received, the high voltage is automatically reduced to all DC-side components to protect the DC-side electrical components after all target battery clusters complete cell balancing and the cycle continues for a preset period of time.

[0022] In a second aspect, an embodiment of the present application provides a battery balancing maintenance method, which is applied to a control device on the AC side of an energy storage system. The method includes:

[0023] receiving a target balancing mode sent by the battery management system of the energy storage system; the target balancing mode includes one of a system balancing mode and a selective balancing mode, wherein the system balancing mode is a mode in which all battery clusters in the energy storage system are uniformly charged and balanced, and the selective balancing mode is a mode in which some battery clusters in the energy storage system are sequentially charged and balanced;

[0024] The target balancing mode is adopted to perform power balancing on a target battery cluster indicated by the target balancing mode; the target battery cluster represents a battery cluster that needs to be power balanced.

[0025] The battery balancing maintenance method provided in this embodiment first uses the target balancing mode transmitted by the battery management system to charge the target battery cluster through the power grid using the target balancing mode to achieve charge balance among the battery clusters, thereby performing balanced maintenance on the energy storage batteries. Furthermore, this method utilizes the power grid to balance the charge among the battery clusters, allowing it to be performed even during the battery cluster discharge process without affecting the discharge operation of the battery cluster. Furthermore, utilizing the power grid for charge balancing maintenance is highly efficient, requires no additional hardware, and is relatively low cost.

[0026] In some embodiments, the target balancing mode is used to balance the power of the target battery cluster indicated by the target balancing mode, including: sending a corresponding balancing instruction to the battery management system based on the target balancing mode; the balancing instruction includes the quantity information and numbering information of the target battery cluster; receiving the battery power parameters of the target battery cluster sent by the battery management system, and delivering the power of the power grid to the target battery cluster based on the battery power parameters.

[0027] In some embodiments, sending corresponding balancing instructions to the battery management system based on the target balancing mode includes: receiving a balancing operation instruction sent by a client controller; the client controller is used to perform overall management of the energy storage system; when the balancing operation instruction indicates that the battery cluster of the energy storage system needs to be balanced, sending corresponding balancing instructions to the battery management system based on the target balancing mode.

[0028] In a third aspect, an embodiment of the present application provides a battery balancing maintenance device, which is applied to a battery management system of a centralized energy storage system. The device includes:

[0029] a balancing mode determination module, configured to determine a target balancing mode based on battery status information of each battery cluster in the energy storage system; the target balancing mode includes one of a system balancing mode and a selective balancing mode, wherein the system balancing mode is a mode in which all battery clusters in the energy storage system are uniformly charged and balanced, and the selective balancing mode is a mode in which some battery clusters in the energy storage system are sequentially charged and balanced;

[0030] The balancing mode feedback module is configured to send the target balancing mode to a control device on the AC side, so that the control device adopts the target balancing mode to perform power balancing on the target battery cluster.

[0031] In a fourth aspect, an embodiment of the present application provides a battery balancing maintenance device, which is applied to a control device on the AC side of an energy storage system. The device includes:

[0032] a balancing mode receiving module, configured to receive a target balancing mode sent by the battery management system of the energy storage system; the target balancing mode includes one of a system balancing mode and a selective balancing mode, wherein the system balancing mode is a mode in which all battery clusters in the energy storage system are uniformly charged and balanced, and the selective balancing mode is a mode in which some battery clusters in the energy storage system are sequentially charged and balanced;

[0033] The power balancing control module is configured to adopt the target balancing mode to perform power balancing on a target battery cluster indicated by the target balancing mode; the target battery cluster represents a battery cluster requiring power balancing.

[0034] In a fifth aspect, embodiments of the present application provide a battery balancing maintenance system for use in an energy storage system, comprising a battery management system of the energy storage system and an AC-side control device. The battery management system includes the battery balancing maintenance device described in the third aspect; the AC-side control device includes the battery balancing maintenance device described in the fourth aspect.

[0035] In a sixth aspect, an embodiment of the present application provides an electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the method described in the first aspect or the second aspect.

[0036] In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the program is executed by a processor to implement the method as described in the first aspect or the second aspect.

[0037] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0039] Figure 1 A schematic diagram of the structure of an energy storage system to which the battery balancing maintenance method provided in some embodiments of the present application is applied;

[0040] Figure 2 A flowchart of a battery balancing maintenance method provided in some embodiments of the present application;

[0041] Figure 3 This is a schematic diagram of a specific flow chart of step S100 in some embodiments of the present application;

[0042] Figure 4 A flowchart of a battery balancing maintenance method provided in some other embodiments of the present application;

[0043] Figure 5 This is a schematic diagram of a specific flow chart of step S400 in some embodiments of the present application;

[0044] Figure 6 A schematic diagram of a specific flow chart of a battery balancing maintenance method provided in some embodiments of the present application;

[0045] Figure 7 A flowchart of a battery balancing maintenance method applied to the AC side provided in some embodiments of the present application;

[0046] Figure 8 A schematic diagram of the results of the battery balancing maintenance device provided in some embodiments of the present application;

[0047] Figure 9 A schematic diagram of the results of a battery balancing maintenance device applied to the AC side provided by some embodiments of the present application;

[0048] Figure 10 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown;

[0049] Figure 11A schematic diagram of a storage medium provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0050] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art in the technical field of the embodiments of the present application; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0052] In the description of the embodiments of the present application, “multiple” means more than two, unless otherwise clearly and specifically defined.

[0053] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0055] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0056] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0057] In related technologies, based on different energy storage integration technologies, electrochemical energy storage systems can be divided into centralized architecture and string architecture. In the centralized architecture, battery packs are connected in series to form battery clusters, and each battery cluster is directly connected in parallel and then connected in series with the PCS; in the string architecture, battery packs are connected in series to form battery clusters, and each battery cluster is converted to a consistent voltage through a DC / DC transformer before being connected in parallel. The parallel battery clusters are then connected in series with the PCS and then in parallel. Figure 1 The following is a schematic diagram of the structure of a centralized energy storage system. Figure 1 As shown, the system includes a DC side and an AC side. The DC side includes multiple battery clusters, a battery management system corresponding to each battery cluster, and a DC side container for the battery clusters. The AC side includes an inverter and a transformer. The energy storage system and the power grid perform AC / DC conversion via the inverter. The AC-side control device (not shown) issues charging and discharging instructions to the DC-side battery management system. Upon receiving these instructions, the battery management system controls each battery cluster to charge with power transmitted from the grid, or to transmit stored power to the grid or power-consuming devices, thereby enabling power exchange between each battery cluster, the grid, and power-consuming devices.

[0058] Currently, balancing maintenance for centralized energy storage systems often involves adding balancing maintenance control devices to the DC side to balance the energy of the battery clusters. The balancing maintenance control devices are matched to the battery clusters in a 1:1 ratio to achieve balanced maintenance for each battery cluster, thereby extending battery life. However, as energy storage capacity increases, the number of balancing maintenance control devices used is also increasing, resulting in high hardware costs for energy storage systems. Furthermore, the inherent failure rate of balancing maintenance control devices increases subsequent maintenance costs.

[0059] Based on the above reasons, an embodiment of the present application proposes a battery balancing maintenance method, which can be applied to the DC side of the energy storage system, and can be specifically executed by the battery management system on the DC side. It can be understood that the battery management system here can be the battery management system of any battery cluster, or it can be the overall management system on the DC side. The overall management system can communicate with all battery management systems to obtain information from each battery management system, and communicate with the control device on the AC side to realize the charge and discharge control of each battery cluster through the power transmission between the power grid and the battery cluster. The method first estimates the balancing mode to be adopted based on the battery status information of each battery cluster in the energy storage system, that is, whether to balance the power of all battery clusters or balance the power of some battery clusters, and sends the estimated result to the control device on the AC side, so that the control device balances the power of the target battery cluster according to the corresponding balancing mode.

[0060] This embodiment determines whether battery cluster balancing is necessary and estimates a balancing mode based on the battery status information of each battery cluster. The estimated balancing mode is then transmitted to the AC-side control device, prompting the control device to use the estimated balancing mode via the power grid to balance the battery clusters, thereby achieving balanced maintenance of the energy storage batteries. Furthermore, this method utilizes the power grid for charging, balancing the charge of each battery cluster. Therefore, this method can be performed even during the battery cluster discharge process, without affecting the discharge operation of the battery cluster. Furthermore, utilizing the power grid for balancing maintenance is highly efficient, requires no additional hardware, and is relatively low-cost.

[0061] It should be noted that this embodiment primarily describes the process of achieving power balancing by charging battery clusters from the grid. However, power balancing in this embodiment can involve either charging or discharging battery clusters. For example, during battery cluster use, if the upper power limit of some battery clusters decreases and charging cannot reach the power level of other battery clusters, the remaining battery clusters must be discharged to achieve power balancing among the battery clusters. The specific discharge balancing control process can be referenced to the charge balancing control process. As long as the batteries discharge and the grid receives power, it is sufficient and will not be further described here.

[0062] It is understandable that the above Figure 1 The energy storage system shown is merely a schematic diagram of the structure of one type of energy storage system that can utilize the battery balancing maintenance method provided in the embodiments of this application. The embodiments of this application are applicable not only to this energy storage system but also to any energy storage system that utilizes a communication connection between an AC-side control device and a DC-side battery management system, and that can control the charging and discharging of a DC-side battery cluster via the power grid to achieve charge balancing within the DC-side battery cluster. Furthermore, the energy storage system may also include other auxiliary equipment, such as a cooling system, a fire protection system, and auxiliary power supplies.

[0063] The following is combined with the accompanying drawings and Figure 1 Taking the energy storage system shown in the figure as an example, the battery balancing maintenance method provided by the embodiment of the present application is described in detail. Figure 2 , Figure 2 A flow chart of the battery balancing maintenance method provided in the embodiment of the present application is shown as follows: Figure 2 As shown, the battery balancing maintenance method may include the following steps:

[0064] Step S100, determining a target balancing mode based on battery status information of each battery cluster in the energy storage system;

[0065] Step S200 : sending the target balancing mode to the control device on the AC side, so that the control device adopts the target balancing mode to perform power balancing on the corresponding battery cluster.

[0066] The battery status information includes at least one of the following: the state of charge (SOC), the current remaining capacity, the accumulated battery voltage, and the internal voltage of each battery cluster, so as to determine the battery clusters requiring cell balancing and their number. It may also include the maximum and minimum cell voltages to determine the power limit for cell balancing.

[0067] The target balancing mode includes one of the system balancing mode and the selective balancing mode. The system balancing mode is a mode for balancing the energy of all battery clusters in the energy storage system. In this mode, all battery clusters in the energy storage system are charged through the power grid. All battery clusters that need to be charged can be charged at the same time. The battery management system will monitor the battery charge status in real time and will not determine the completion of the battery cluster's charge balancing until the last battery cluster is charged. The selective balancing mode is a mode for balancing the energy of some battery clusters in the energy storage system. In this mode, the battery clusters that need to be balanced in the energy storage system are balanced one by one through the power grid. When one battery cluster is balanced, the next battery cluster is balanced until all battery clusters that need to be balanced are balanced.

[0068] Specifically, it can be determined that the battery clusters need to be battery-balanced when the difference in the state of charge of any two battery clusters is greater than or equal to a first preset threshold, or when the difference in the current remaining power of any two battery clusters is greater than or equal to a second preset threshold. It can also be determined that the battery clusters need to be battery-balanced when the difference between the total capacity of all battery clusters and the standard energy storage capacity of the energy storage system is greater than a certain threshold. This embodiment does not specifically limit the values of the first preset threshold and the second preset threshold. Those skilled in the art can set them according to actual circumstances. For example, but not limited to, the first preset threshold can be equal to 2% to 10%, and the second preset threshold can be 2% to 10% of the standard power of the battery cluster.

[0069] The battery balancing maintenance method provided in this embodiment first determines a target balancing mode that best suits the current state of each battery cluster based on the battery status information of each battery cluster in the energy storage system. This target balancing mode is then transmitted to the AC-side control device, prompting the control device to charge the corresponding battery cluster using the target balancing mode via the power grid. This method implements power balancing maintenance for the battery clusters requiring power balancing, thereby achieving power balancing maintenance for the energy storage batteries. Furthermore, this method utilizes the power grid for charging, balancing the power of each battery cluster. Therefore, this method can be performed even during the discharge process of the battery cluster, without affecting its discharge and use. Furthermore, utilizing the power grid for power balancing maintenance is highly efficient, requires no additional hardware, and is relatively low-cost.

[0070] In some embodiments, as Figure 3 As shown, step S100 may include the following processing: step S110, based on the battery status information of each battery cluster in the energy storage system, estimating the target battery cluster that needs to be balanced; step S120, based on the number of target battery clusters, determining the target balancing mode.

[0071] The target battery cluster is used to represent the battery cluster that needs to be battery balanced. When the difference between the state of charge of the target battery cluster and the state of charge of other battery clusters in the energy storage system is greater than or equal to the first threshold, it can be considered that the target battery cluster needs to be battery balanced.

[0072] Specifically, after determining that balancing is required, the system balancing mode can be used, but is not limited to, when the number of target battery clusters is greater than or equal to half of the total number of battery clusters; when the number of target battery clusters is less than half of the total number of battery clusters, the selective balancing mode can be used.

[0073] In this embodiment, the target battery clusters and their number that need to be power balanced are first determined based on the battery status information of each battery cluster, and then the target balancing mode is determined based on the number of target battery clusters. Targeted power balancing maintenance can be performed on the battery cluster according to the battery status of the battery cluster to select a more appropriate balancing mode, further improve the balancing maintenance efficiency, and reduce energy waste.

[0074] It is understandable that the above-mentioned estimation of the target balancing mode based on the data of the target battery is only one implementation method of this embodiment. This embodiment can also use other parameters of the battery cluster to estimate the target balancing mode. For example, when the difference between the sum of the capacities of all battery clusters in the energy storage system and the standard capacity of the energy storage system is greater than or equal to a certain threshold, the system balancing mode can be adopted; when the difference between the sum of the capacities of all battery clusters in the energy storage system and the standard capacity of the energy storage system is less than a certain threshold, the selection balancing mode can be adopted.

[0075] In some embodiments, as Figure 4 As shown, the battery balancing maintenance method may further include the following processing: step S300, receiving a balancing instruction sent by a control device; step S400, in response to the balancing instruction, sending the battery power parameters of the target battery cluster to the control device, so that the control device transmits the power of the power grid to the target battery cluster based on the battery power parameters.

[0076] The balancing instruction includes the serial number information of the target battery cluster. After receiving the serial number information of the target battery cluster, the battery management system can determine the target battery cluster and the target balancing mode according to the number of the serial numbers.

[0077] In actual applications, after the control device on the AC side receives the target balancing mode sent by the battery management system on the DC side, the control device can determine whether it is indeed necessary to balance the battery cluster on the DC side according to the actual situation. If it is determined that the battery cluster does need to be balanced, a balancing instruction can be generated based on the target balancing mode and sent to the battery management system on the DC side. After receiving the balancing instruction, the battery management system can first determine the target battery cluster indicated in the balancing instruction, and send the battery power parameters of the target battery cluster to the control device, so that the control device can transmit the power of the power grid to the target battery cluster based on the battery power parameters to prevent excessive power from damaging the battery.

[0078] It should be noted that the control device can also further determine the actual balancing mode based on the target balancing mode sent by the battery management system and the specific conditions of the energy storage system. For example, if the total number of battery clusters is large, even if the number of target battery clusters does not reach half of the total number of battery clusters, and even if the battery management system estimates the target balancing mode to be the selected balancing mode, the control device can still select the system balancing mode. Therefore, after receiving the balancing instruction, the battery management system needs to determine the specific balancing mode indicated by the balancing instruction based on the received instruction.

[0079] Specifically, if Figure 5 As shown, the above step S400 may include the following processing: step S410, in response to the balancing instruction, determining the target balancing mode and the target battery cluster indicated by the balancing instruction; step S420, based on the target balancing mode, applying high voltage to the target battery cluster, and sending the battery power parameters of the target battery cluster to the control device.

[0080] In practical applications, the open-circuit voltage of a battery cluster is relatively high, reaching thousands of volts. Therefore, relays are required on both the positive and negative busbars of the battery cluster to prevent personal injury from high voltages. When the battery cluster is not charging, the relays are open to prevent power loss. To charge the battery cluster, the relays must be closed. The "high voltage" here can be understood as a command requesting the relays to close.

[0081] The battery power parameters of the target battery cluster may include a specific power limit (minimum value), as well as a voltage limit and a current limit. These may be power limits for each target battery cluster or for the entire target battery cluster. In other words, each target battery cluster has a corresponding power limit, and the power limit for the entire target battery cluster is the minimum value among the power limits corresponding to each target battery cluster.

[0082] In this embodiment, different high-voltage strategies can be configured for different balancing modes. Therefore, upon receiving a balancing instruction, the target balancing mode and target battery cluster indicated by the balancing instruction can be determined. Then, based on the target balancing mode, high voltage can be applied to the target battery cluster, implementing a targeted high-voltage strategy. This embodiment also transmits the battery power parameters of the target battery cluster to the control device, so that the control device can determine the appropriate charging power based on these battery parameters to avoid charging the battery cluster with excessive power, which could cause overheating and shorten the battery cluster's lifespan.

[0083] If the target balancing mode includes the system balancing mode, the target battery clusters include all battery clusters in the energy storage system. Step S420 may include the following specific processing: determining a battery power limit corresponding to the system balancing mode based on the battery power parameters of all battery clusters in the energy storage battery; transmitting the battery power limit to the control device; and applying high voltage to all battery clusters in the energy storage system.

[0084] The battery power limit corresponding to the system balancing mode can be understood as the minimum power limit among the power limits corresponding to all battery clusters.

[0085] In this embodiment, the minimum power limit among the power limits corresponding to all battery clusters can be determined based on the battery power parameters of all battery clusters in the energy storage battery, and the desired minimum power limit can be used as the battery power limit corresponding to the system balancing mode. The battery power limit is then sent to the control device, so that the control device charges each battery cluster based on the battery power limit, avoiding the use of a larger power limit for a battery cluster with a smaller power limit. This can better protect the battery clusters during the charging process and increase the service life of the battery clusters. In the system balancing mode, the battery management system does not need to distinguish the specific battery clusters that need to be charged and can directly apply high voltage to all battery clusters in the energy storage system, which can reduce the time of command transmission back and forth and improve charging efficiency.

[0086] If the target balancing mode also includes a selection balancing mode, the target battery cluster includes some battery clusters in the energy storage system. Correspondingly, step S420 may include the following specific processing: based on the target balancing mode, the number of the first battery cluster in the partial battery clusters and the battery power parameters of the first battery cluster are sent to the control device, and the first battery cluster is subjected to high voltage; if the first battery cluster has completed battery balancing, a battery cluster is selected from the battery clusters in the partial battery clusters that have not completed battery balancing as a new first battery cluster, and the step of returning to the step of sending the number of the first battery cluster and the battery power parameters to the control device is executed in a loop until all the battery clusters have completed battery balancing.

[0087] The first battery cluster may be any battery cluster that requires battery balancing.

[0088] In this embodiment, when the number of target battery clusters is small, selective balancing can be performed, that is, selectively balancing the battery capacity of some battery clusters in the energy storage system. When performing selective balancing, each target battery cluster can be increased in high voltage and charged one by one. After the battery capacity of the target battery cluster currently undergoing battery balancing reaches the balanced value (the difference in SOC value with other battery clusters is within a preset range), the target battery cluster currently undergoing battery balancing is reduced in high voltage, and then the next target battery cluster that has not yet completed battery balancing is increased in high voltage and charged. In this way, by increasing the high voltage and charging the target battery clusters one by one, accurate charging can be achieved, reducing energy waste, and improving the efficiency of battery balancing, especially when the number of target battery clusters is small.

[0089] Furthermore, the battery balancing maintenance method may also include the following processing: when the first battery cluster completes power balancing, sending a high-voltage reduction request for the first battery cluster to the control device; when all target battery clusters complete power balancing and continue for a preset period of time; or, when receiving a power balancing shutdown instruction sent by the control device, reducing the high voltage of all components on the DC side of the energy storage system.

[0090] Here, "lowering high voltage" can be understood as an instruction to disconnect the relay. The preset duration can be several tens of seconds, such as 60 seconds, and is not specifically limited in this embodiment. All DC-side components may include any systems and devices located on the DC side that are in a high-voltage state during the battery cluster charge balancing process, such as, but not limited to, cooling systems and other auxiliary equipment.

[0091] In this embodiment, when the first battery cluster completes cell balancing, the high voltage is reduced to prevent continued high voltage from causing a discharge circuit in the battery, resulting in heating and shortening battery life. In actual applications, when all target battery clusters complete cell balancing, a shutdown balancing maintenance instruction is received from the control device. At this time, the high voltage is reduced to all DC-side components to protect the DC-side electrical components. If no shutdown balancing maintenance instruction is received, the high voltage is automatically reduced to all DC-side components to protect the DC-side electrical components after all target battery clusters complete cell balancing and the cycle continues for a preset period of time.

[0092] Specifically, if Figure 6 The figure shows a specific flow chart of the battery balancing maintenance method provided by this application. The execution subject of this battery balancing maintenance method is the overall management system, which communicates with the battery management system of each battery cluster and the control device on the AC side to jointly complete the battery balancing maintenance of the battery cluster. The specific flow of this battery balancing maintenance method is as follows:

[0093] First, each battery management system collects battery status information from each battery cluster, including but not limited to the state of charge, current remaining capacity, battery cumulative voltage, internal voltage of the battery cluster, and maximum and minimum cell voltages. This battery status information is then transmitted to the central management system. Based on the battery status information from each battery cluster, the central management system determines whether battery balancing maintenance is necessary. If necessary, it further analyzes whether a system balancing mode or a selected balancing mode is required, determining a target balancing mode and transmitting this target balancing mode to the AC-side control device. The control device can also receive instructions from the client controller to determine whether to perform balancing maintenance and which balancing mode to use. Specifically, if the client controller issues a balancing operation instruction, it determines that battery balancing is necessary for the battery cluster and, based on the information contained in the balancing operation instruction, determines the balancing mode to use. It then generates a corresponding balancing instruction and transmits it to the central management system. The central management system then determines the balancing mode indicated by the received balancing instruction and, based on this balancing mode, issues a high-voltage instruction to the battery management system of the corresponding battery cluster. In response to the received high-voltage-up command, the corresponding battery management system applies high voltage to the battery cluster it manages, determines whether the battery cluster is in a high-voltage state, and determines the power limit for this state. The system then sends this information to the central management system. Based on the information sent by each battery management system, the central management system determines whether the corresponding battery cluster has entered the corresponding balancing mode. If the battery cluster has entered this mode, it feeds back the power limit for this balancing mode to the AC-side control device. The control device then charges the target battery cluster via the power grid based on the power limit reported by the central management system. After a certain period of time, the central management system determines whether the target battery cluster has completed cell balancing and sends this information back to the control device. Based on the received feedback, the control device determines whether cell balancing has been completed for the target battery cluster. If all target battery clusters have completed cell balancing, it sends a command to the central management system to disable cell balancing. Upon receiving this command, or after waiting 60 seconds after all target battery clusters have completed cell balancing, the central management system can request that all DC-side components reduce high voltage and exit cell balancing mode.

[0094] Based on the same concept as the above-mentioned battery balancing maintenance method, the embodiment of the present application also provides a battery balancing maintenance method, which is applied to the control device on the AC side of the energy storage system, such as Figure 7 As shown, the method includes:

[0095] Step S1, receiving a target balancing mode sent by a battery management system of an energy storage system;

[0096] Step S2: using the target balancing mode to perform power balancing on the target battery cluster indicated by the target balancing mode.

[0097] The target balancing mode includes either system balancing mode or selective balancing mode. System balancing mode uniformly balances all battery clusters in the energy storage system, while selective balancing mode sequentially balances some battery clusters in the energy storage system. The target battery cluster represents the battery cluster that requires balancing, and can be any battery cluster.

[0098] The battery balancing maintenance method provided in this embodiment first uses the target balancing mode transmitted by the battery management system to charge the target battery cluster through the power grid using the target balancing mode to achieve charge balance among the battery clusters, thereby performing balanced maintenance on the energy storage batteries. Furthermore, this method utilizes the power grid to balance the charge among the battery clusters, allowing it to be performed even during the battery cluster discharge process without affecting the discharge operation of the battery cluster. Furthermore, utilizing the power grid for charge balancing maintenance is highly efficient, requires no additional hardware, and is relatively low cost.

[0099] In some embodiments, the above step S2 may include the following processing: based on the target balancing mode, sending corresponding balancing instructions to the battery management system; receiving the battery power parameters of the target battery cluster sent by the battery management system, and transmitting the power of the power grid to the target battery cluster based on the battery power parameters.

[0100] The balancing instruction may include the quantity information and number information of the target battery clusters;

[0101] In this embodiment, after receiving the target balancing mode sent by the battery management system on the DC side, the control device can determine whether it is indeed necessary to balance the battery cluster on the DC side based on actual conditions. If it is determined that it is indeed necessary to balance the battery cluster, a balancing instruction can be generated based on the target balancing mode, and the balancing instruction can be sent to the battery management system on the DC side. After receiving the balancing instruction, the battery management system can first determine the target battery cluster indicated in the balancing instruction, and send the battery power parameters of the target battery cluster to the control device, so that the control device can transmit the power of the power grid to the target battery cluster based on the battery power parameters.

[0102] In other embodiments, the above-mentioned step of sending corresponding balancing instructions to the battery management system based on the target balancing mode may include the following processing: receiving a balancing operation instruction sent by the client controller; when the balancing operation instruction indicates that the battery cluster of the energy storage system needs to be balanced, sending corresponding balancing instructions to the battery management system based on the target balancing mode.

[0103] Among them, the client controller can be understood as a client that can perform human-computer interaction and is used to manage the energy storage system as a whole. For example, in a site controller, relevant personnel can send balancing operation instructions to the control device through the interactive interface of the client controller. The control device can only send balancing maintenance instructions to the battery management system when the received balancing operation instructions indicate that balancing maintenance is required.

[0104] In this embodiment, after receiving the target balancing mode sent by the battery management system on the DC side, the control device can determine whether it is indeed necessary to balance the battery cluster on the DC side according to actual conditions, that is, first determine, if it is determined that it is indeed necessary to balance the battery cluster, it can generate a balancing instruction based on the target balancing mode, and send the balancing instruction to the battery management system on the DC side. After receiving the balancing instruction, the battery management system can first determine the target battery cluster indicated in the balancing instruction, and send the battery power parameters of the target battery cluster to the control device, so that the control device can transmit the power of the power grid to the target battery cluster based on the battery power parameters.

[0105] It is understandable that the battery balancing maintenance method provided in this embodiment is based on the same inventive concept as the battery balancing maintenance method applied to the DC side. When the embodiment of the battery balancing maintenance method applied to the DC side involves the AC side, the implementation method is also applicable to the battery balancing maintenance method applied to the AC side, and will not be repeated here.

[0106] Based on the same concept as the above-mentioned battery balancing maintenance method, the embodiment of the present application also provides a battery balancing maintenance device for implementing the above-mentioned DC side battery balancing maintenance method, such as Figure 8 As shown, the device includes:

[0107] A balancing mode determination module is used to determine a target balancing mode based on the battery status information of each battery cluster in the energy storage system. The target balancing mode includes one of a system balancing mode and a selective balancing mode. The system balancing mode is a mode in which all battery clusters in the energy storage system are uniformly charged and balanced, while the selective balancing mode is a mode in which some battery clusters in the energy storage system are sequentially charged and balanced.

[0108] The balancing mode feedback module is used to send the target balancing mode to the control device on the AC side, so that the control device adopts the target balancing mode to balance the power of the corresponding battery cluster.

[0109] It is understandable that the battery balancing maintenance device for the DC side provided in this embodiment is used to execute the above-mentioned battery balancing maintenance method for the DC side, and therefore can at least achieve the beneficial effects that can be achieved by the above-mentioned battery balancing maintenance method for the DC side. In addition, the various embodiments of the battery balancing maintenance method for the DC side are also applicable to the battery balancing maintenance device, and will not be described in detail here.

[0110] Based on the same concept as the battery balancing maintenance method applied to the AC side, the embodiment of the present application further provides a battery balancing maintenance device applied to the AC side, which is used to implement the battery balancing maintenance method applied to the AC side. Figure 9 As shown, the device includes:

[0111] A balancing mode receiving module is configured to receive a target balancing mode sent by the battery management system of the energy storage system. The target balancing mode includes a system balancing mode and a selective balancing mode. The system balancing mode is a mode in which all battery clusters in the energy storage system are uniformly charged and balanced, while the selective balancing mode is a mode in which some battery clusters in the energy storage system are sequentially charged and balanced.

[0112] The power balancing control module is used to perform power balancing on a target battery cluster indicated by the target balancing mode using a target balancing mode; the target battery cluster represents a battery cluster that needs to be power balanced.

[0113] It is understandable that the battery balancing maintenance device for the AC side provided in this embodiment is used to execute the above-mentioned battery balancing maintenance method for the AC side, and therefore can at least achieve the beneficial effects that can be achieved by the above-mentioned battery balancing maintenance method for the AC side. In addition, the various embodiments of the battery balancing maintenance method for the AC side are also applicable to the battery balancing maintenance device, and will not be described in detail here.

[0114] Based on the same concept as the above-mentioned battery balancing maintenance method applied to the AC side, an embodiment of the present application also provides a battery balancing maintenance system applied to an energy storage system, including a battery management system of the energy storage system and a control device on the AC side. The battery management system includes a battery balancing maintenance device applied to the DC side; the control device includes a battery balancing maintenance device applied to the AC side.

[0115] It is understandable that the battery balancing maintenance system provided in this embodiment includes both a battery balancing maintenance device applied to the DC side and a battery balancing maintenance device applied to the AC side. Therefore, it can achieve the beneficial effects that can be achieved by the battery balancing maintenance method applied to the DC side, as well as the beneficial effects that can be achieved by the battery balancing maintenance method applied to the AC side. Detailed description is omitted here.

[0116] The present application also provides an electronic device to perform the above-mentioned battery balancing maintenance method. Figure 10 , which shows a schematic diagram of an electronic device provided by some embodiments of the present application. Figure 10 As shown, the electronic device 8 includes: a processor 800, a memory 801, a bus 802 and a communication interface 803. The processor 800, the communication interface 803 and the memory 801 are connected via the bus 802. The memory 801 stores a computer program that can be run on the processor 800. When the processor 800 runs the computer program, it executes the battery balancing maintenance method provided in any of the aforementioned embodiments of the present application.

[0117] The memory 801 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage. The communication connection between the device network element and at least one other network element is achieved through at least one communication interface 803 (which may be wired or wireless), and may use the Internet, a wide area network, a local area network, a metropolitan area network, etc.

[0118] Bus 802 can be an ISA bus, a PCI bus, or an EISA bus. Buses can be divided into address buses, data buses, and control buses. Memory 801 is used to store programs, and processor 800 executes the programs after receiving execution instructions. The battery balancing maintenance method disclosed in any of the aforementioned embodiments of the present application can be applied to or implemented by processor 800.

[0119] The processor 800 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by hardware integrated logic circuits in the processor 800 or by software instructions. The above processor 800 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in conjunction with the embodiments of this application can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in the memory 801 , and the processor 800 reads the information in the memory 801 and completes the steps of the above method in combination with its hardware.

[0120] The electronic device provided in the embodiment of the present application and the battery balancing maintenance method provided in the embodiment of the present application are based on the same inventive concept and have the same beneficial effects as the methods adopted, operated or implemented therein.

[0121] The present application also provides a computer-readable storage medium corresponding to the battery balancing maintenance method provided in the above embodiment. Figure 11 The computer-readable storage medium shown is a CD 30 on which a computer program (ie, a program product) is stored. When the computer program is run by a processor, the battery balancing maintenance method provided by any of the aforementioned embodiments is executed.

[0122] It should be noted that examples of computer-readable storage media may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical or magnetic storage media, which are not listed here one by one.

[0123] The computer-readable storage medium provided in the embodiment of the present application and the battery balancing maintenance method provided in the embodiment of the present application are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented by the application programs stored therein.

[0124] An embodiment of the present application further provides a computer program product corresponding to the battery balancing maintenance method provided in the aforementioned embodiment, including a computer program. The computer program is executed by a processor to implement the aforementioned battery balancing maintenance method.

[0125] The computer program product provided in the embodiment of the present application is based on the same inventive concept as the battery balancing maintenance method provided in the embodiment of the present application, and has the same beneficial effects as the method implemented by executing the computer program thereof by a processor.

[0126] It will be understood by those skilled in the art that, in the above-mentioned methods in the specific embodiments, the order in which the steps are written does not necessarily mean a strict execution order and does not limit the implementation process. The specific execution order of each step should be determined by its function and possible internal logic. (Method Example)

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery balancing maintenance method, characterized in that: A battery management system applied to an energy storage system, the method comprising: Determining a target balancing mode based on battery status information of each battery cluster in the energy storage system; the target balancing mode includes one of a system balancing mode and a selective balancing mode, wherein the system balancing mode is a mode for performing charge balancing on all battery clusters in the energy storage system, and the selective balancing mode is a mode for performing charge balancing on some battery clusters in the energy storage system; The target balancing mode is sent to a control device on the AC side, so that the control device adopts the target balancing mode to balance the power of the corresponding battery cluster.

2. The method according to claim 1, wherein The determining of a target balancing mode based on battery status information of each battery cluster in the energy storage system includes: Based on the battery status information of each battery cluster in the energy storage system, estimating the target battery cluster that needs to be battery balanced; A target balancing mode is determined based on the number of target battery clusters.

3. The method according to claim 1, wherein The method further comprises: receiving a balancing instruction sent by the control device; the balancing instruction includes serial number information of the target battery cluster; In response to the balancing instruction, the battery power parameters of the target battery cluster are sent to the control device, so that the control device transmits the power of the grid to the target battery cluster based on the battery power parameters.

4. The method according to claim 3, wherein The step of sending the battery power parameters of the target battery cluster to the control device in response to the balancing instruction includes: In response to the balancing instruction, determining a target balancing mode and a target battery cluster indicated by the balancing instruction; Based on the target balancing mode, the target battery cluster is subjected to high voltage, and the battery power parameters of the target battery cluster are sent to the control device.

5. The method according to claim 4, wherein The target balancing mode includes a system balancing mode, and the target battery cluster includes all battery clusters in the energy storage system; The step of applying high voltage to the target battery cluster based on the target balancing mode and sending the battery power parameters of the target battery cluster to the control device includes: Determining a battery power limit corresponding to a system balancing mode based on battery power parameters of all battery clusters in the energy storage battery; The battery power limit is sent to the control device, and high voltage is applied to all battery clusters in the energy storage system.

6. The method according to claim 4, wherein The target balancing mode includes a selection balancing mode, and the target battery cluster includes some battery clusters in the energy storage system; The step of applying high voltage to the target battery cluster based on the target balancing mode and sending the battery power parameters of the target battery cluster to the control device includes: Based on the target balancing mode, the number of the first battery cluster in the part of the battery clusters and the battery power parameters of the first battery cluster are sent to the control device, and the first battery cluster is subjected to high voltage; When the first battery cluster completes battery balancing, a battery cluster is selected from the battery clusters that have not completed battery balancing in the partial battery clusters as a new first battery cluster, and the step of returning to sending the number and battery power parameters of the first battery cluster to the control device is executed in a loop until all the battery clusters complete battery balancing.

7. The method according to claim 6, wherein The method further comprises: When the first battery cluster completes power balancing, applying high voltage to the first battery cluster; When all target battery clusters complete power balancing and the power balancing is maintained for a preset period of time; or when a power balancing shutdown instruction sent by the control device is received, all components on the DC side of the energy storage system are subjected to a high voltage reduction.

8. A battery balancing maintenance method, characterized in that: A control device applied to the AC side of an energy storage system, the method comprising: receiving a target balancing mode sent by the battery management system of the energy storage system; the target balancing mode includes one of a system balancing mode and a selective balancing mode, wherein the system balancing mode is a mode in which all battery clusters in the energy storage system are uniformly charged and balanced, and the selective balancing mode is a mode in which some battery clusters in the energy storage system are sequentially charged and balanced; The target balancing mode is adopted to perform power balancing on a target battery cluster indicated by the target balancing mode; the target battery cluster represents a battery cluster that needs to be power balanced.

9. The method according to claim 8, wherein The adopting the target balancing mode to perform power balancing on the target battery cluster indicated by the target balancing mode includes: Based on the target balancing mode, a corresponding balancing instruction is sent to the battery management system; the balancing instruction includes the quantity information and number information of the target battery clusters; The battery management system receives the battery power parameters of the target battery cluster sent by the battery management system, and transmits the power of the power grid to the target battery cluster based on the battery power parameters.

10. The method according to claim 9, wherein The sending a corresponding balancing instruction to the battery management system based on the target balancing mode includes: receiving a balancing operation instruction sent by a client controller; the client controller is used to perform overall management of the energy storage system; When the balancing operation instruction indicates that the battery cluster of the energy storage system needs to be balanced, a corresponding balancing instruction is sent to the battery management system based on the target balancing mode.

11. A battery balancing maintenance device, characterized in that: A battery management system for a centralized energy storage system, the device comprising: a balancing mode determination module, configured to determine a target balancing mode based on battery status information of each battery cluster in the energy storage system; the target balancing mode includes one of a system balancing mode and a selective balancing mode, wherein the system balancing mode is a mode in which all battery clusters in the energy storage system are uniformly charged and balanced, and the selective balancing mode is a mode in which some battery clusters in the energy storage system are sequentially charged and balanced; The balancing mode feedback module is configured to send the target balancing mode to a control device on the AC side, so that the control device adopts the target balancing mode to perform power balancing on the corresponding battery cluster.

12. A battery balancing maintenance device, characterized in that: A control device applied to the AC side of an energy storage system, the device comprising: a balancing mode receiving module, configured to receive a target balancing mode sent by the battery management system of the energy storage system; the target balancing mode includes one of a system balancing mode and a selective balancing mode, wherein the system balancing mode is a mode in which all battery clusters in the energy storage system are uniformly charged and balanced, and the selective balancing mode is a mode in which some battery clusters in the energy storage system are sequentially charged and balanced; The power balancing control module is configured to adopt the target balancing mode to perform power balancing on a target battery cluster indicated by the target balancing mode; the target battery cluster represents a battery cluster requiring power balancing.

13. A battery balancing maintenance system, characterized in that: Applicable to an energy storage system, comprising a battery management system of the energy storage system and an AC-side control device, wherein the battery management system comprises the battery balancing maintenance device according to claim 11; and the AC-side control device comprises the battery balancing maintenance device according to claim 12.

14. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: The processor runs the computer program to implement the method according to any one of claims 1 to 10.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method according to any one of claims 1 to 10.

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