Battery management system of energy storage system

Abstract

The invention provides a battery management system of an energy storage system, which is provided with a field control unit, a battery cluster management unit and a battery management unit. The field control unit can realize stack-level protection and monitoring of a battery system, parallel coordination control and energy management of a plurality of battery cluster-level current conversion sub-modules, communication and monitoring of energy storage auxiliary equipment, safety protection linkage control and fine thermal management control of an energy storage system, and electric quantity metering of an alternating current side confluence part. The battery cluster management unit can realize cluster-level battery protection, operation monitoring and state estimation functions of the battery system, control of a battery cluster-level current conversion sub-module and charge and discharge quantity metering of a battery cluster; the battery management unit realizes the functions of acquiring the voltage and the battery temperature of the single batteries in the battery pack and controlling the battery equalization, so that the centralized access and control of the energy storage system can be realized, the interaction between the batteries and the energy storage system can be effectively utilized, the utilization efficiency of the batteries can be improved, and the safety risk can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of energy storage battery management, and in particular to a battery management system for an energy storage system. Background Art

[0002] With the growing global demand for renewable energy, energy storage systems have been increasingly widely used in many fields, especially in power systems and electric vehicles.

[0003] The battery management system is one of the core systems of the energy storage system. Its main functions include safety protection, charge and discharge control, battery status estimation, etc. At present, the existing battery management system only focuses on monitoring and managing the relevant status of the battery system, and pays less attention to the mutual influence caused by the relationship between the battery system and the energy storage system. This influence may lead to incomplete information sharing of the energy storage system, improper protection configuration and coordination, system management conflicts, and may also cause safety problems. In addition, with the increasing degree of integration of energy storage systems, higher requirements are also put forward for various indicators of energy storage systems, such as floor space, system cost, system performance, etc. To adapt to this, the battery management system also needs to adjust the functional structure and communication methods to meet the corresponding requirements. Summary of the invention

[0004] One purpose of the present application is to provide a battery management system for an energy storage system, so as to solve the problems of low integration of energy storage systems, complex communication architecture, low efficiency of information sharing and coordination, and inaccurate power metering under the existing technology.

[0005] To achieve the above objectives, some embodiments of the present application provide a battery management system for an energy storage system, the battery management system comprising:

[0006] The field control unit includes a battery stack-level management module, a cluster-level coordination control module, an auxiliary control management module, a converged electric energy metering module, and an auxiliary circuit electric energy metering module; the battery stack-level management module is used for stack-level protection and monitoring of the battery system; the cluster-level coordination control module is used to realize parallel coordination control and energy management of multiple battery cluster-level converter modules; the auxiliary control management module is used to realize communication and monitoring of energy storage auxiliary equipment, and realize safety protection linkage control and refined thermal management control of the energy storage system; the converged electric energy metering module is used to realize the electric quantity metering of the converged part on the AC side; the auxiliary circuit electric energy metering module is used to realize the electric quantity metering of the auxiliary system power supply;

[0007] The battery cluster management unit includes a battery cluster-level management module, a battery cluster-level current conversion control module and a DC power metering module; the battery cluster-level management module is used to implement cluster-level battery protection, operation monitoring and state estimation functions of the battery system; the battery cluster-level current conversion control module is used to implement control of the battery cluster-level current conversion submodule; the DC power metering module is used to implement charge and discharge measurement of the battery cluster;

[0008] The battery management unit is used to collect the voltage and temperature of the single cells in the battery pack and control the battery balancing function.

[0009] Furthermore, the types of battery cluster-level converter modules include: string-type DC / AC converters, parallel-type DC / DC converters and series-type DC / DC converters.

[0010] Furthermore, the field control unit interacts with the battery cluster management unit via a first communication bus.

[0011] Furthermore, the first communication bus includes any one of the following: a CAN bus, an Ethernet bus or an RS485 bus.

[0012] Furthermore, the energy storage auxiliary equipment includes one or more combinations of the following: fire-fighting equipment, temperature control equipment, dynamic environment equipment and switch electrical equipment.

[0013] Furthermore, the field control unit interacts with fire-fighting equipment, temperature control equipment, dynamic environment equipment and switch electrical equipment through the auxiliary control management module.

[0014] Furthermore, the field control unit interacts with the fire-fighting equipment, temperature control equipment, dynamic environment equipment and switch electrical equipment through the auxiliary control management module via a message bus or an independent communication method.

[0015] Furthermore, the field control unit is connected to the AC side bus circuit and the AC side auxiliary circuit through a mutual inductor.

[0016] Furthermore, the battery cluster management unit interacts with the battery management unit via a second communication bus.

[0017] Furthermore, the second communication bus includes any one of the following: a daisy chain bus, a CAN bus or an RS485 bus.

[0018] Compared with the prior art, the solution provided by the present application sets up a field control unit, a battery cluster management unit and a battery management unit in the battery management system; the field control unit realizes the stack-level protection and monitoring of the battery system through the battery stack-level management module, realizes the parallel coordinated control and energy management of multiple battery cluster-level converter modules through the cluster-level coordinated control module, realizes the communication and monitoring of energy storage auxiliary equipment through the auxiliary control management module, realizes the safety protection linkage control and refined thermal management control of the energy storage system, realizes the power metering of the AC side converter part through the bus power metering module, and realizes the power metering of the auxiliary system power supply through the auxiliary line power metering unit; the battery cluster management unit realizes the cluster-level battery protection, operation monitoring and state estimation functions of the battery system through the battery cluster-level management module, realizes the control of the battery cluster-level converter module through the battery cluster-level converter control module, and realizes the charge and discharge metering of the battery cluster through the DC power metering module; the battery The management unit collects the voltage and temperature of the single cells in the battery pack and controls the battery balancing function, thereby realizing centralized access and management of the energy storage system, effectively utilizing the interaction between the battery and the energy storage system, improving the utilization efficiency of the battery and reducing safety risks; it can also realize information sharing and collaborative work in the energy storage system, improve efficiency when processing large-scale battery systems, and meet the needs of large-scale energy storage systems; it can also improve the integration of the secondary control loop controller of the energy storage system, simplify the system structure, reduce the system cost, and improve the reliability and stability of the system; it can also improve the accuracy of the battery state estimation algorithm, more accurately estimate the battery state, and improve the battery's use efficiency and safety; it can also improve the control performance of the cluster-level converter module in parallel, more effectively control the operation of multiple battery clusters, and improve the system's operating efficiency and reliability; it can also reduce the cost of the secondary part of the energy storage system and improve the economic benefits of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0020] Figure 1 A functional block diagram of a battery management system for an energy storage system provided in some embodiments of the present application.

[0021] Figure 2 A functional block diagram of a field control unit provided for some embodiments of the present application.

[0022] Figure 3 A functional block diagram of a battery cluster management unit provided for some embodiments of the present application.

[0023] Figure 4 A communication architecture diagram of a battery management system of an energy storage system provided for some embodiments of the present application. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0025] Here, the battery management system of the energy storage system according to the embodiment of the present application is suitable for use in scenarios where the status of the battery system in the energy storage system is monitored and managed.

[0026] In this scenario, an integrated energy storage system such as a containerized energy storage system includes a primary equipment system and a secondary control system. The primary equipment system mainly includes a battery system, an energy storage converter system, a temperature control system, a dynamic environment system, etc. The secondary control system mainly includes a battery management system, an auxiliary control management system, an electric energy metering system, etc. When the energy storage converter adopts a cluster-level converter topology, the secondary control system may also have a cluster-level coordination controller. The secondary control system is mainly used to monitor and manage various equipment systems in the primary equipment system, such as managing the battery system through a battery management system. The energy storage system guarantees the normal operation of the whole to a certain extent through the secondary control system, but the secondary control system also brings problems such as a large number of controllers, complex communication architecture, independent work, lack of effective information sharing and collaborative work, and poor real-time control and protection. As a result, when dealing with large-scale battery systems, it further leads to long protection delays, poor control accuracy, low system integration, and high comprehensive costs. Therefore, it is necessary to improve the secondary control system of the energy storage system in terms of control architecture and comprehensive cost, improve the integration of the secondary control system, improve the system control performance, and reduce the comprehensive cost of the control system.

[0027] In the energy storage system, multiple single cells are connected in series to form a battery pack (PACK), multiple battery packs are connected in series to form a battery cluster, and multiple battery clusters are connected in parallel to form a battery system. The battery management system is one of the core systems of the energy storage system. This application integrates the functions of multiple controllers in the secondary control system of the energy storage system into the battery management system to achieve improvements in the control architecture and comprehensive cost of the secondary control system in this scenario. For example, by integrating the auxiliary control system, the integration of the secondary control system of the energy storage system is improved, the number of controllers is reduced, the communication architecture of the secondary system is simplified, and the effective information sharing and collaborative work of the system are improved; by integrating the cluster-level coordination controller, the control performance of multiple clusters of converters in parallel is improved, etc.

[0028] In addition, the battery cluster charge and discharge statistics function of the existing battery management system cannot meet the metering standards and cannot be used as a basis for billing. The battery array management unit does not have the AC voltage and current collection function, and cannot realize the statistics of the AC side charge and discharge. It is usually necessary to add multiple AC power meters to the energy storage system to realize system charge and discharge statistics, self-power statistics, system efficiency calculation and system loss calculation. This application integrates the DC power metering system to improve the cluster-level charge and discharge power statistics performance to a high-precision metering level. The high-precision cluster-level power metering results can improve the accuracy of the battery state estimation algorithm; by integrating the AC side power metering system, it makes up for the defect that the battery management system cannot measure the AC side power, so that the system efficiency and loss efficiency can be accurately calculated.

[0029] The battery management system of the energy storage system provided in the embodiment of the present application is provided with a field control unit, a battery cluster management unit and a battery management unit in the battery management system; the field control unit realizes stack-level protection and monitoring of the battery system through the battery stack-level management module, realizes parallel coordinated control and energy management of multiple battery cluster-level converter modules through the cluster-level coordinated control module, realizes communication and monitoring of energy storage auxiliary equipment through the auxiliary control management module, realizes safety protection linkage control and refined thermal management control of the energy storage system, realizes power metering of the AC side converter part through the converging power metering module, and realizes power metering of the auxiliary system power supply through the auxiliary power metering unit; the battery cluster management unit realizes cluster-level battery protection, operation monitoring, and state estimation functions of the battery system through the battery cluster-level management module, realizes control of the battery cluster-level converter module through the battery cluster-level converter control module, and realizes charge and discharge metering of the battery cluster through the DC power metering module The battery management unit collects the voltage and temperature of the single cells in the battery pack and controls the battery balancing function, thereby realizing centralized access and management of the energy storage system, effectively utilizing the interaction between the battery and the energy storage system, improving the utilization efficiency of the battery and reducing safety risks; it can also realize information sharing and collaborative work in the energy storage system, improve efficiency when dealing with large-scale battery systems, and meet the needs of large-scale energy storage systems; it can also improve the integration of the secondary control loop controller of the energy storage system, simplify the system structure, reduce the system cost, and improve the reliability and stability of the system; it can also improve the accuracy of the battery state estimation algorithm, more accurately estimate the battery state, and improve the battery's use efficiency and safety; it can also improve the control performance of the cluster-level converter module in parallel, more effectively control the operation of multiple battery clusters, and improve the system's operating efficiency and reliability; it can also reduce the cost of the secondary part of the energy storage system and improve the economic benefits of the system.

[0030] Some embodiments of the present application provide a battery management system for an energy storage system, such as Figure 1As shown, the system consists of three levels of control units, namely a field control unit 101, a battery cluster management unit 102 and a battery management unit 103. The field control unit 101 is in communication connection with the battery cluster management unit 102, and the battery cluster management unit 102 is in communication connection with the battery management unit 103.

[0031] Figure 2 FIG. 4 shows a functional block diagram of a field control unit SCU in some embodiments of the present application. Figure 2 As shown, in some embodiments, the site control unit (SCU) 101 includes a battery stack level management module 201, a cluster level coordination control module 202, an auxiliary control management module 203, a bus power metering module 204 and an auxiliary line power metering module 205.

[0032] The battery stack management module 201 mainly implements stack-level protection and monitoring of the battery system to ensure safe and efficient operation of the battery system.

[0033] The cluster-level coordination control module 202 mainly implements the parallel coordination control and energy management functions of multiple battery cluster-level converter modules.

[0034] In some embodiments, the types of battery cluster-level converter modules may include, but are not limited to: a string DC / AC converter (DC / AC), a parallel DC / DC converter (DC / DC), and a series DC / DC converter (DC / DC).

[0035] The auxiliary control management module 203 is used to realize the communication and monitoring of energy storage auxiliary equipment, realize the safety protection linkage control and refined thermal management control of the energy storage system, and ensure the safe and economical operation of the energy storage system.

[0036] In some embodiments, energy storage auxiliary equipment may include, but is not limited to: fire-fighting equipment, temperature control equipment, dynamic environment equipment, and switch electrical equipment, etc. These devices are used to realize different auxiliary functions in the energy storage system.

[0037] In some embodiments, the field control unit 101 can interact with fire-fighting equipment, temperature control equipment, dynamic environment equipment and switch electrical equipment through the auxiliary control management module 203 to achieve status monitoring and management of these devices.

[0038] Specifically, the field control unit 101 can interact with fire-fighting equipment, temperature control equipment, dynamic and environmental equipment and switching electrical equipment through the auxiliary control management module via the message bus, that is, the field control unit 101 sends the data for interaction with a certain device to the message bus, and the message bus forwards the data to the device, such as the dynamic and environmental device. The process of sending the feedback data of the dynamic and environmental device to the field control unit 101 is similar, that is, the dynamic and environmental device sends the feedback data to the message bus, and the message bus forwards it to the field control unit 101.

[0039] In addition, the field control unit 101 can also interact with fire-fighting equipment, temperature control equipment, dynamic environment equipment and switch electrical equipment through an independent communication method through the auxiliary control management module, that is, the field control unit 101 communicates point-to-point with the equipment that needs to interact without going through the mediation of the message bus.

[0040] The combined electric energy metering module 204 realizes the electric energy metering of the combined part of the AC side, which can accurately count the charge and discharge amount of the energy storage system and improve the system operation efficiency.

[0041] The auxiliary circuit power metering module 205 realizes the power metering of the auxiliary system power supply, and can accurately count the self-power consumption and power loss efficiency of the auxiliary control equipment of the energy storage system.

[0042] In addition, in some embodiments, the field control unit 101 is connected to the AC side bus circuit and the AC side auxiliary circuit through a transformer, thereby achieving access and collection of three-phase AC voltage signals and three-phase AC current signals.

[0043] Figure 3 FIG. 2 shows a functional block diagram of a battery cluster management unit BCU in some embodiments of the present application. Figure 3 As shown, in some embodiments, the battery cluster management unit (BCU) 102 includes a battery cluster level management module 301 , a battery cluster level current conversion control module 302 and a DC power metering module 303 .

[0044] The battery cluster management module 301 mainly implements functions such as cluster-level battery protection, operation monitoring, and state estimation of the battery system to ensure safe and efficient operation of the batteries in the battery cluster.

[0045] The battery cluster-level current conversion control module 302 mainly implements the control of the battery cluster-level current conversion submodule, so as to enable the battery cluster to provide refined power output to the outside.

[0046] The DC power metering module 303 mainly realizes the charge and discharge metering of the battery cluster and accurately calculates the operating efficiency of the battery cluster. The high-precision power metering result is then used as the input of the battery state estimation algorithm, which can improve the accuracy of the battery state estimation algorithm.

[0047] In some embodiments, the field control unit 101 interacts with the battery cluster management unit 102 via a first communication bus, and the interactive data between the two is first sent to the first communication bus and then sent to the corresponding destination unit by the first communication bus.

[0048] In some embodiments, the first communication bus may include, but is not limited to, an industrial communication bus such as a CAN bus, an Ethernet bus, or an RS485 bus.

[0049] The battery management unit (BMU) 103 is used to collect the voltage and temperature of the single cells in the battery pack (PACK), control battery balancing, and other functions.

[0050] In some embodiments, the battery cluster management unit 102 interacts with the battery management unit 103 via the second communication bus, and the interactive data between the two is first sent to the second communication bus and then sent to the corresponding destination unit by the second communication bus.

[0051] In some embodiments, the second communication bus may include, but is not limited to, an industrial communication bus such as a daisy chain bus, a CAN bus, or an RS485 bus.

[0052] Figure 4 The communication architecture diagram of the battery management system of the energy storage system in some embodiments of the present application is shown. Figure 4 As shown, a field control unit SCU can be configured in the battery management system of a containerized energy storage system, a battery cluster management unit BCU can be configured in each battery cluster, and a battery management unit BMU can be configured in a battery PACK. The field control unit SCU and multiple battery cluster management units BCU in the stack realize information exchange through the communication bus, and the field control unit SCU and the fire-fighting equipment, temperature control equipment, dynamic environment equipment, and switch electrical equipment in the energy storage system realize information exchange through the communication bus or independent communication. The field control unit SCU is connected to the AC side bus circuit and the AC side auxiliary circuit through a mutual inductor to realize the access and collection of three-phase AC voltage signals and three-phase AC current signals. The battery cluster management unit BCU and multiple battery management units BMU in the cluster realize information exchange through the communication bus.

[0053] The battery management system of the energy storage system provided in the embodiments of the present application can solve the following technical problems:

[0054] (1) The problem of too many controllers in the secondary control system of the energy storage system. By deeply integrating the auxiliary system controller, DC power metering controller, AC power metering controller, cluster-level coordinated control controller, cluster-level power conversion controller, etc. into the hardware structure of the battery management system, the controller integration of the secondary control system in the energy storage system is improved and the space occupied by the energy storage system is reduced.

[0055] (2) The problem of incomplete and untimely information sharing in the secondary control system of the energy storage system. By integrating multiple traditional independently operated controllers into the same hardware device, the communication level of the secondary control system is simplified; the scattered data is aggregated in the same controller, thereby improving the completeness and real-time nature of information interaction in the energy storage system and reducing system management conflicts.

[0056] (3) The energy storage system lacks a high-precision method for measuring the power of the battery cluster. In traditional battery management systems, the sampling accuracy of DC voltage and DC current is about 1%, while the accuracy of electric energy measurement needs to be much greater than 1%. By integrating the DC power metering controller with hardware, the sampling accuracy of DC voltage and DC current is greatly improved, thereby achieving high-precision measurement of the power of the battery cluster. The high-precision power measurement results are then used as the input of the battery state SOX estimation algorithm, which can further improve the accuracy of the battery state estimation algorithm.

[0057] (4) The problem that the master and slave cluster-level converter modules cannot be independently controlled. Cluster-level converter modules usually adopt the master and slave synchronous control method. When the cluster-level converter module as the master fails, it will affect the normal operation of other cluster-level converter modules as slaves. By integrating the cluster-level coordination controller, all cluster-level converter modules are set as slaves, thereby achieving independent centralized control and improving the reliability of parallel operation of cluster-level converter modules.

[0058] Therefore, the integrated battery management system provided in the embodiment of the present application can significantly improve the integration of the secondary control system in the energy storage system, simplify the communication architecture of the secondary control system, reduce the space occupancy and comprehensive cost of the secondary control system, and provide a basic guarantee for the safe, economical and efficient operation of the energy storage system. It has important application value and economic value in the fields of new energy power generation, energy storage integration, etc.

[0059] In summary, the solution provided by the present application sets up a field control unit, a battery cluster management unit and a battery management unit in the battery management system; the field control unit realizes the stack-level protection and monitoring of the battery system through the battery stack-level management module, realizes the parallel coordinated control and energy management of multiple battery cluster-level converter modules through the cluster-level coordinated control module, realizes the communication and monitoring of energy storage auxiliary equipment through the auxiliary control management module, realizes the safety protection linkage control and refined thermal management control of the energy storage system, realizes the power metering of the AC side converter part through the bus power metering module, and realizes the power metering of the auxiliary system power supply through the auxiliary power metering unit; the battery cluster management unit realizes the cluster-level battery protection, operation monitoring and state estimation functions of the battery system through the battery cluster-level management module, realizes the control of the battery cluster-level converter module through the battery cluster-level converter control module, and realizes the charge and discharge measurement of the battery cluster through the DC power metering module; the battery management The management unit realizes the collection of the voltage and battery temperature of the single battery in the battery pack and controls the battery balancing function, thereby realizing the centralized access and control of the energy storage system, effectively utilizing the interaction between the battery and the energy storage system, improving the utilization efficiency of the battery and reducing safety risks; it can also realize information sharing and collaborative work in the energy storage system, improve efficiency when processing large-scale battery systems, and meet the needs of large-scale energy storage systems; it can also improve the integration of the secondary control loop controller of the energy storage system, simplify the system structure, reduce the system cost, and improve the reliability and stability of the system; it can also improve the accuracy of the battery state estimation algorithm, more accurately estimate the battery state, and improve the battery use efficiency and safety; it can also improve the control performance of the cluster-level converter module in parallel, more effectively control the operation of multiple battery clusters, and improve the system's operating efficiency and reliability; it can also reduce the cost of the secondary part of the energy storage system and improve the economic benefits of the system.

[0060] It should be noted that the present application can be implemented in software and / or a combination of software and hardware, for example, can be implemented using an application specific integrated circuit (ASIC), a general purpose computer or any other similar hardware device. In one embodiment, the software program of the present application can be executed by a processor to implement the steps or functions described above. Similarly, the software program of the present application (including relevant data structures) can be stored in a computer-readable recording medium, for example, a RAM memory, a magnetic or optical drive or a floppy disk and similar devices. In addition, some steps or functions of the present application can be implemented using hardware, for example, as a circuit that cooperates with a processor to perform each step or function.

[0061] In a typical configuration of the present application, the terminal and the network device each include one or more processors (CPU), input / output interface, network interface and memory.

[0062] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0063] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media 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 memory technology, read-only compact disk (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include non-transitory media such as modulated data signals and carrier waves.

[0064] In addition, a part of the present application may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present application through the operation of the computer. The program instruction for calling the method of the present application may be stored in a fixed or removable recording medium, and / or transmitted through a data stream in a broadcast or other signal-bearing medium, and / or stored in a working memory of a computer device that runs according to the program instruction. Here, according to an embodiment of the present application, a device is included, the device including a memory for storing computer program instructions and a processor for executing program instructions, wherein, when the computer program instruction is executed by the processor, the device is triggered to run the method and / or technical solution based on the aforementioned multiple embodiments according to the present application.

[0065] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is limited by the attached claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the present application. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the device claim can also be implemented by one unit or device through software or hardware. The words first, second, etc. are used to indicate names, and do not indicate any particular order.

Claims

1. A battery management system for an energy storage system, characterized in that: The system comprises: The field control unit includes a battery stack-level management module, a cluster-level coordination control module, an auxiliary control management module, a converged electric energy metering module, and an auxiliary circuit electric energy metering module; the battery stack-level management module is used for stack-level protection and monitoring of the battery system; the cluster-level coordination control module is used to realize parallel coordination control and energy management of multiple battery cluster-level converter modules; the auxiliary control management module is used to realize communication and monitoring of energy storage auxiliary equipment, and realize safety protection linkage control and refined thermal management control of the energy storage system; the converged electric energy metering module is used to realize the electric quantity metering of the converged part on the AC side; the auxiliary circuit electric energy metering module is used to realize the electric quantity metering of the auxiliary system power supply; The battery cluster management unit includes a battery cluster-level management module, a battery cluster-level current conversion control module and a DC power metering module; the battery cluster-level management module is used to implement cluster-level battery protection, operation monitoring, and state estimation functions of the battery system; the battery cluster-level current conversion control module is used to implement control of the battery cluster-level current conversion submodule; the DC power metering module is used to implement charge and discharge capacity metering of the battery cluster; The battery management unit is used to collect the voltage and temperature of the single cells in the battery pack and control the battery balancing function.

2. The battery management system according to claim 1, characterized in that: The types of battery cluster-level converter modules include: string-type DC / AC converters, parallel-type DC / DC converters and series-type DC / DC converters.

3. The battery management system according to claim 1, characterized in that: The field control unit interacts with the battery cluster management unit via a first communication bus.

4. The battery management system according to claim 3, characterized in that: The first communication bus includes any one of the following: CAN bus, Ethernet bus or RS485 bus.

5. The battery management system according to claim 1, characterized in that: The energy storage auxiliary equipment includes one or more combinations of the following: fire-fighting equipment, temperature control equipment, dynamic environment equipment and switch electrical equipment.

6. The battery management system according to claim 5, characterized in that: The field control unit interacts with the fire-fighting equipment, the temperature control equipment, the dynamic environment equipment and the switch electrical equipment through the auxiliary control management module.

7. The battery management system according to claim 6, characterized in that: The field control unit interacts with the fire-fighting equipment, the temperature control equipment, the dynamic environment equipment and the switch electrical equipment through the auxiliary control management module via a message bus or an independent communication method.

8. The battery management system according to claim 1, characterized in that: The field control unit is connected with the AC side bus circuit and the AC side auxiliary circuit through a mutual inductor.

9. The battery management system according to claim 1, characterized in that: The battery cluster management unit interacts with the battery management unit via a second communication bus.

10. The battery management system according to claim 9, characterized in that: The second communication bus includes any one of the following: a daisy chain bus, a CAN bus or an RS485 bus.

Images