Energy storage system

Abstract

The embodiment of the invention discloses an energy storage system, which comprises an alternating current power grid, a main outdoor cabinet and a plurality of slave outdoor cabinets, one side of the main outdoor cabinet is connected with the alternating current power grid; each slave outdoor cabinet is connected to the other side of the master outdoor cabinet; wherein a first busbar is arranged in the main outdoor cabinet, the alternating current power grid is connected to the first side of the first busbar, the main outdoor cabinet is connected to the second side of the first busbar, and each auxiliary outdoor cabinet is connected to the third side of the first busbar. According to the scheme, the first busbar is arranged in the main outdoor cabinet, and the slave outdoor cabinet can charge and discharge with the alternating current power grid through the first busbar, so that a convergence cabinet does not need to be independently configured for cable convergence, and the cost of the energy storage system can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of energy storage, and particularly relates to an energy storage system. Background Art

[0002] In the case of a relatively large power demand, traditional lithium battery energy storage outdoor cabinets generally adopt a multi-cabinet parallel connection scheme. As Figure 1 shown, the energy management system (EMS) built in the busbar cabinet is connected to the power converter (PCS) and the battery management system (BMS) in the outdoor cabinet through communication cables. The EMS controls the outdoor cabinet to be connected to the AC power grid through the busbar cabinet, realizes the parallel operation of the outdoor cabinet system, and finally realizes charging the lithium batteries in the outdoor cabinet system with the electric energy of the AC power grid or discharging the electric energy in the outer cabinet system to the AC power grid.

[0003] It can be seen that in the current energy storage system, a busbar cabinet needs to be configured to realize the parallel operation of the outdoor cabinet system, which increases the cost of the energy storage system. Summary of the Invention

[0004] Embodiments of this application provide an energy storage system, an electronic device, and a storage medium, which can reduce the cost of the energy storage system.

[0005] Embodiments of this application provide an energy storage system, including:

[0006] An AC power grid;

[0007] A main outdoor cabinet, one side of which is connected to the AC power grid;

[0008] A plurality of slave outdoor cabinets, each of which is respectively connected to the other side of the main outdoor cabinet;

[0009] Wherein, a first busbar is arranged in the main outdoor cabinet, the AC power grid is connected to the first side of the first busbar, the main outdoor cabinet is connected to the second side of the first busbar, and each slave outdoor cabinet is respectively connected to the third side of the first busbar.

[0010] Optionally, in some embodiments of this application, the main outdoor cabinet includes a first power conversion module and a management module;

[0011] Wherein, one side of the first power conversion module is connected to the second side of the first busbar, and the management module is connected to the adjacent slave outdoor cabinet through the other side of the first power conversion module.

[0012] Optionally, in some embodiments of this application, the management module includes a system management unit, a first battery management unit, and a switch;

[0013] Wherein, one side of the system management unit is connected to an adjacent slave outdoor cabinet through the other side of the first power conversion module, and the other side of the system management unit is connected to the switch; the first battery management unit is connected to the switch.

[0014] Optionally, in some embodiments of the present application, the system management unit is configured to interact with the AC power grid, and in response to the requirements of the AC power grid, adjust the charge and discharge strategy based on the battery status data reported by the first battery management unit and the battery status data uploaded from the outdoor cabinet.

[0015] Optionally, in some embodiments of the present application, the first battery management unit is configured to collect the battery status data of the main outdoor cabinet and report the collected battery status data to the system management unit.

[0016] Optionally, in some embodiments of the present application, the slave outdoor cabinet includes a second battery management unit and a second power conversion module;

[0017] Wherein, the second battery management unit is connected to the switch, and the second power conversion module is connected to the first busbar.

[0018] Optionally, in some embodiments of the present application, the slave outdoor cabinet further includes a second busbar, and the second power conversion module is connected to the first busbar through the second busbar.

[0019] Optionally, in some embodiments of the present application, one side of the second power conversion module closest to the main outdoor cabinet is connected to the first power conversion module, the other side of the second power conversion module closest to the main outdoor cabinet is connected to an adjacent second power conversion module, and the remaining second power conversion modules are respectively connected to adjacent second power conversion modules.

[0020] Optionally, in some embodiments of the present application, one main outdoor cabinet corresponds to four slave outdoor cabinets.

[0021] Optionally, in some embodiments of the present application, the main outdoor cabinet is further connected to a communication module and transmits information with the communication module.

[0022] An embodiment of the present application provides an energy storage system, including: an AC power grid, at least one main outdoor cabinet, and multiple slave outdoor cabinets. One side of the main outdoor cabinet is connected to the AC power grid, and each slave outdoor cabinet is respectively connected to the other side of the main outdoor cabinet. Wherein, a first busbar is arranged in the main outdoor cabinet, the AC power grid is connected to the first side of the first busbar, the main outdoor cabinet is connected to the second side of the first busbar, and each slave outdoor cabinet is respectively connected to the third side of the first busbar. In the energy storage system provided by the present application, the first busbar is arranged in the main outdoor cabinet, and the slave outdoor cabinets can charge and discharge with the AC power grid through the first busbar. Thus, there is no need to separately configure a busbar cabinet for cable busbar connection, thereby reducing the cost of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 is a schematic structural diagram of an existing energy storage system;

[0025] Figure 2 is a schematic structural diagram of the energy storage system provided by the embodiment of the present application;

[0026] Figure 3 is another schematic structural diagram of the energy storage system provided by the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application. Without conflict, the following various embodiments and their technical features can be combined with each other.

[0028] It should be noted that in this document, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising that element. In addition, components, features, and elements with the same name in different embodiments of this application may have the same meaning or different meanings, and their specific meanings need to be determined based on their interpretation in that specific embodiment or further in combination with the context of that specific embodiment.

[0029] It should be understood that the specific embodiments described herein are merely for explaining this application and are not used to limit this application.

[0030] In the following description, the suffixes such as "module", "component" or "unit" used to represent elements are only for the convenience of explaining this application and have no specific meaning in themselves. Therefore, "module", "component" or "unit" can be used interchangeably.

[0031] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of the energy storage system provided by the embodiment of this application. In the embodiment of this application, an energy storage system 1 is provided. The energy storage system 1 includes an AC power grid 10, a main outdoor cabinet 20, and slave outdoor cabinets 30. One side of the main outdoor cabinet 20 is connected to the AC power grid 10, and each slave outdoor cabinet 30 is respectively connected to one side of the main outdoor cabinet 20. Among them, a first busbar 201 is arranged in the main outdoor cabinet 20. The AC power grid 10 is connected to the first side of the first busbar 201, the main outdoor cabinet 20 is connected to the second side of the first busbar 201, and each slave outdoor cabinet 30 is respectively connected to the third side of the first busbar 201.

[0032] An outdoor cabinet refers to an electrical equipment cabinet or cabinet designed for outdoor environments. Outdoor cabinets are widely used in fields such as power systems, telecommunications, solar photovoltaic systems, and energy storage systems. Outdoor cabinets usually need to be able to resist harsh weather conditions and environmental factors such as rain, dust, high temperature, and low temperature. Outdoor cabinets can protect sensitive electronic equipment and battery packs from environmental impacts. Therefore, outdoor cabinets are particularly important in energy storage systems.

[0033] In the embodiments of the present application, the main outdoor cabinet 20 refers to an outdoor cabinet integrating multiple key components. As the control center and power management hub of the entire energy storage system, specifically, the main outdoor cabinet 20 is responsible for distributing electrical energy from the AC grid 10 to each slave outdoor cabinet 30, or collecting the electrical energy of the slave outdoor cabinet 30 and sending it back to the AC grid 10. The main outdoor cabinet 20 is responsible for monitoring and optimizing the operation of the entire energy storage system, including energy scheduling, optimized operation, and interaction with the grid. Optionally, in some embodiments of the present application, the main outdoor cabinet 20 may include a battery pack for providing energy storage capacity and power support.

[0034] In the embodiments of the present application, the slave outdoor cabinet 30 refers to an auxiliary energy storage unit connected to the main outdoor cabinet 20. These slave outdoor cabinets can serve as an extended part of the energy storage system to provide additional energy storage capacity and power support. The slave outdoor cabinet 30 may also include a battery pack for expanding the total capacity of the energy storage system. Among them, the slave outdoor cabinet 30 can supply electrical energy to the grid during peak demand periods, or charge from the grid during low demand periods. The slave outdoor cabinet 30 operates in parallel with the main outdoor cabinet 20 to jointly form a coordinated energy storage system. In addition, if one slave outdoor cabinet 20 fails, other slave outdoor cabinets 20 can continue to operate, reducing the impact on the energy storage system.

[0035] Optionally, in some embodiments of the present application, the main outdoor cabinet 20 may include a first power conversion module 202 and a management module 203; wherein, one side of the first power conversion module 202 is connected to the second side of the first busbar 201, and the management module 203 is connected to the adjacent slave outdoor cabinet 30 through the other side of the first power conversion module 202.

[0036] The first power conversion module 202 is a Power Conversion System (PCS), which is used to convert the direct current (DC) from the battery pack into alternating current (AC) so as to supply power (discharge) to the AC grid 10, and is also used to convert the alternating current of the AC grid 10 into direct current for charging the battery pack. Among them, the first power conversion module 202 can ensure that the alternating current output during discharge is synchronized with the frequency and phase of the grid to ensure power quality. At the same time, the first power conversion module 202 can receive control signals from the management module 203 to adjust the charge and discharge power or respond to the requirements of the grid.

[0037] The management module 203 refers to a unit that integrates various control and monitoring functions. The management module 203 is crucial for ensuring the efficient and safe operation of the energy storage system. Optionally, in some embodiments of the present application, the management module 203 may include an Energy Management System (EMS), a Battery Management System (BMS), or other relevant control and monitoring systems. Among them, the management module 20 can be responsible for monitoring and optimizing the operation of the entire energy storage system, including energy scheduling, optimized operation, and interaction with the power grid. For example, according to the grid demand, electricity price information, and battery status, it intelligently schedules the charging and discharging process. At the same time, the management module 20 can also monitor the operating status of the battery pack, including voltage, current, temperature, and SOC (State of Charge). For example, the management module 20 implements battery protection strategies such as overcharge, over-discharge, overtemperature, and short-circuit protection. In addition, the management module 203 can also collect and process data from various parts of the energy storage system, providing data support for system optimization and fault diagnosis.

[0038] The management module 203 is connected to the adjacent slave outdoor cabinet 30 through the first power conversion module 202. The management module 203 can send control instructions to the first power conversion module 202, such as adjusting the charging and discharging power, implementing protection strategies, etc.

[0039] For example, when the electricity price of the AC power grid 10 is low or the renewable energy generation is excessive, the electric energy of the AC power grid 10 is transmitted to the first power conversion module 202 through the first busbar 201. The first power conversion module 202 converts the alternating current into direct current to charge the battery pack. When the grid electricity price is high or the grid needs additional power support, the direct current of the battery pack is converted into alternating current through the first power conversion module 202. The converted electric energy is sent back to the grid through the first busbar 201.

[0040] Optionally, in some embodiments of the present application, the management module 203 may specifically include a system management unit 2031, a first battery management unit 2032, and a switch 2033;

[0041] Among them, one side of the system management unit 2031 is connected to the adjacent slave outdoor cabinet 20 through the other side of the first power conversion module 202, and the other side of the system management unit 2031 is connected to the switch 2033; the first battery management unit 2032 is connected to the switch 2033.

[0042] The system management unit 2031 is the Energy - Battery Management System (EM - BS). EM - BS is an integrated management system that combines the functions of energy management and battery management, and is responsible for the monitoring, control, and optimization of the entire energy storage system. In energy management, EM - BS can intelligently schedule the charging and discharging processes of the energy storage system based on grid demand, electricity price information, load prediction, and battery status. At the same time, it performs grid services such as peak shaving and valley filling, demand response, and grid frequency regulation. In battery management, EM - BS can monitor the operating status of the battery pack, including voltage, current, temperature, and SOC (State of Charge); implement battery protection strategies, such as overcharge, over - discharge, overtemperature, and short - circuit protection; perform battery balancing to ensure that the voltages or SOCs of each cell in the battery pack are consistent, thereby extending the battery life.

[0043] In addition, EM - BS can also collect and process data from various parts of the energy storage system, providing data support for system optimization and fault diagnosis, such as analyzing battery performance and life, and predicting battery health status. Moreover, EM - BS can also perform remote monitoring and control through an Internet connection, allowing operation and maintenance personnel to remotely access the system status and perform maintenance, such as receiving alarm information, performing system maintenance, and handling faults.

[0044] Specifically, EM - BS is connected to the adjacent slave outdoor cabinet 30 through the first power conversion module 202 and can send control commands to the first power conversion module 202, such as adjusting the charging and discharging power, implementing protection strategies, etc. EM - BS is connected to the switch 2033 and exchanges data and communicates with other components in the energy storage system through the switch.

[0045] The first battery management unit 2032 is the master controller of the battery management system (abbreviated as BMS master). The BMS master is used for: real - time monitoring of key parameters of each battery cell in the battery pack, such as voltage, current, temperature, etc.; estimating the remaining battery charge to provide information on the available energy of the battery for the system; performing battery balancing to ensure that the voltages and SOCs of each battery cell in the battery pack are consistent, avoiding overcharging or over - discharging of the battery; identifying abnormal conditions in the battery pack, such as overheating, over - voltage, under - voltage, etc., and performing fault diagnosis; when a fault or abnormality is detected, implementing protection measures, such as cutting off the current, to protect the battery from damage; recording battery operation data to provide data support for battery health status analysis and life prediction.

[0046] The first battery management unit 2032 communicates with other components in the system through the switch 2033 to achieve data exchange and instruction transmission.

[0047] It should be noted that the system management unit 2031, as a system-level management unit, is responsible for the energy management, optimized operation strategy of the entire energy storage system, and interaction with the power grid, ensuring that the system achieves the best performance both economically and technically. The first battery management unit 2032 focuses on the management at the battery pack level, including battery monitoring, state estimation, equalization management, and fault protection, to ensure the safe, reliable, and long-life operation of the battery pack.

[0048] Optionally, in some embodiments of the present application, the system management unit 2031 is used to interact with the AC power grid 10 and, in response to the requirements of the AC power grid 10, adjust the charge and discharge strategy based on the battery state data reported by the first battery management unit 2032 and the battery state data uploaded from the outdoor cabinet.

[0049] For example, the system management unit 2031 is responsible for real-time interaction with the AC power grid 10 to ensure that the energy storage system can meet the grid requirements, such as frequency regulation, load balancing, peak shaving, etc.; the system management unit 2031 intelligently adjusts the charge and discharge strategy of the energy storage system according to the grid requirements and electricity price signals to optimize economic benefits and grid support; the system management unit 2031 analyzes and processes the battery state data reported by the first battery management unit 2032 (BMS master) and the battery state information collected from each outdoor cabinet. Then, based on the analysis results, the system management unit 2031 dynamically adjusts the charge and discharge strategy of the energy storage system to ensure that the battery operates in a safe and efficient state. The system management unit 2031 can also continuously optimize the overall performance of the energy storage system, improve energy utilization efficiency, extend battery life, and reduce operating costs.

[0050] Optionally, in some embodiments of the present application, the first battery management unit 2032 is used to collect the battery state data of the main outdoor cabinet 20 and report the collected battery state data to the system management unit 2031. For example, specifically, the first battery management unit 2032 is responsible for real-time collection of the key state data of the battery pack in the main outdoor cabinet 20, including battery voltage, current, temperature, state of charge (SOC), etc. Then, the first battery management unit 2032 performs real-time analysis on the collected data to evaluate the health state of the battery and identify any abnormal conditions, such as overheating, overcharging, over-discharging, etc. Next, the first battery management unit 2032 reports the analyzed battery state data to the system management unit 2031 and receives and executes the instructions issued by the system management unit 2031, such as adjusting the charge and discharge rate, performing battery equalization, etc.

[0051] Optionally, in some embodiments of the present application, the slave outdoor cabinet 30 includes a second battery management unit 301 and a second power conversion module 302; wherein, the second battery management unit 301 is connected to the switch 2033, and the second power conversion module 302 is connected to the first busbar 201.

[0052] Among them, the second battery management unit 201 is also the BMS master controller, which is used to be responsible for real-time monitoring of the status of the battery pack in the slave outdoor cabinet 30, including voltage, current, temperature, and state of charge (SOC); performing battery equalization operations to ensure that the voltages and SOCs of each battery cell in the battery pack are consistent, avoiding overcharging or over-discharging of the battery, thereby extending the battery life; monitoring the battery pack to identify any abnormal conditions, such as overheating, overvoltage, undervoltage, or short circuit, and performing fault diagnosis; sending the collected battery status data to the system management unit 2031 or other monitoring systems through the switch 2033; receiving control instructions from the system management unit 2031, such as adjusting the charge and discharge strategies, and performing corresponding operations.

[0053] The second power conversion module 302 can convert alternating current into direct current to charge the battery pack. When the grid electricity price is high or the grid needs additional power support, the direct current of the battery pack in the slave outdoor cabinet is converted into alternating current through the second power conversion module 302.

[0054] Optionally, in some embodiments of the present application, please refer to Figure 3 , the slave outdoor cabinet 30 may specifically further include a second busbar 303, and the second power conversion module 302 is connected to the first busbar 201 through the second busbar 303.

[0055] Among them, the second busbar 303 refers to a group of conductive bars or busbars, which are used to distribute and transmit electrical energy between different components in the slave outdoor cabinet. The function of the second busbar 303 is similar to that of the first busbar 201 in the main outdoor cabinet 20, but is specifically used for the electrical energy management inside the slave outdoor cabinet 30. Specifically, the second busbar 303 is responsible for distributing the electrical energy generated by the second power conversion module 302 in the slave outdoor cabinet 30 to where it is needed, such as the battery pack or other system components. In addition, the second busbar 303 is also used to collect the electrical energy generated from different sources inside the slave outdoor cabinet 30, such as the discharge of the battery pack, and then transmit it to the second power conversion module 302. Moreover, the second busbar 303 also serves as a standardized connection interface, enabling the electrical energy to be transmitted from the second power conversion module 302 to the first busbar 201, realizing the electrical energy exchange with the main outdoor cabinet 20. Through the second busbar 303, the slave outdoor cabinet 30 can work in cooperation with other parts of the energy storage system to jointly meet the needs of the grid.

[0056] Optionally, in some embodiments of the present application, please refer to Figure 2 or Figure 3, one side of the second power conversion module 302 closest to the main outdoor cabinet 20 is connected to the first power conversion module 202, the other side of the second power conversion module 302 closest to the main outdoor cabinet 20 is connected to the adjacent second power conversion module 302, and the remaining second power conversion modules 302 are respectively connected to the adjacent second power conversion module 302.

[0057] As Figure 3 shown, there is a first power conversion module 202 in the main outdoor cabinet 20, which is responsible for handling the interface with the AC power grid 10. There is a second power conversion module 302 in the outermost outdoor cabinet 30 (hereinafter referred to as the outermost cabinet 1) closest to the main outdoor cabinet 20. One side of it is connected to the first power conversion module 202, and the other side is connected to the second power conversion module 302 in the adjacent outermost outdoor cabinet 30 (hereinafter referred to as the outermost cabinet 2). One side of the second power conversion module 302 of the outermost cabinet 2 is connected to the first power conversion module 202, and the other layer of the outermost cabinet 2 is connected to the second power conversion module 302 in the adjacent outermost outdoor cabinet 30 (hereinafter referred to as the outermost cabinet 3); one side of the outermost cabinet 3 is connected to the second power conversion module 302 of the outermost cabinet 2, and the other side of the second power conversion module 302 of the outermost cabinet 3 is connected to the second power conversion module 302 in the adjacent outermost outdoor cabinet 30 (hereinafter referred to as the outermost cabinet 4); one side of the second power conversion module 302 of the outermost cabinet 4 is connected to the second power conversion module 302 of the outermost cabinet 3, and the other layer of the second power conversion module 302 of the outermost cabinet 4 is not connected to other components. This configuration allows electrical energy to flow from the AC power grid 10 through the main outdoor cabinet 20, successively through the outermost cabinet 1, the outermost cabinet 2, the outermost cabinet 3, and the outermost cabinet 4. Such a design helps to achieve flexible distribution and transmission of electrical energy, while ensuring the reliability and maintainability of the system.

[0058] Optionally, in some embodiments of the present application, one main outdoor cabinet 20 corresponds to four outermost outdoor cabinets 30.

[0059] It should be noted that in the present application, the energy storage system 1 is divided into one main outdoor cabinet 20 and multiple outermost outdoor cabinets 30, which can achieve modular design. This design makes the energy storage system 1 more flexible and facilitates expansion or reduction according to needs. Each outermost outdoor cabinet 30 can be regarded as an independent functional module and can be installed, maintained, and replaced separately. The main outdoor cabinet 20 is responsible for the core control and management functions of the energy storage system 1, while the outermost outdoor cabinet 30 provides additional energy storage capacity. If a certain outermost outdoor cabinet 30 fails, the main outdoor cabinet 20 and other outermost outdoor cabinets 30 can still continue to operate, improving the reliability and redundancy of the entire energy storage system 1.

[0060] It should also be noted that in some embodiments of the present application, the main outdoor cabinet 20 and the four slave outdoor cabinets 30 are used as the minimum unit of the energy storage system 1. The communication lines have been planned in each minimum unit. Therefore, when multiple minimum units are connected in parallel, only the parallel connection busbars need to be connected together for parallel connection, without the need for additional communication networking, which greatly simplifies the system networking difficulty. At the same time, in the PCS of each outdoor cabinet, an AC switch is built in, which can ensure that when an outdoor cabinet (the main outdoor cabinet 20 or the slave outdoor cabinet 30) fails to work, this outdoor cabinet can be turned off to ensure the normal operation of the system.

[0061] Compared with the traditional solution of separately designing a busbar cabinet, this solution eliminates the busbar cabinet body and reduces the system cost. At the same time, without separately designing a busbar cabinet, the design time is also saved.

[0062] Optionally, in some embodiments of the present application, the main outdoor cabinet 20 is also connected to the communication module 40 and performs information transmission with the communication module 40.

[0063] The above has introduced in detail an energy storage system provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An energy storage system, characterized in that: include: AC power grid; A main outdoor cabinet, one side of which is connected to the AC power grid; A plurality of slave outdoor cabinets, each of which is connected to the other side of the main outdoor cabinet; A first busbar is arranged in the main outdoor cabinet, the AC power grid is connected to a first side of the first busbar, the main outdoor cabinet is connected to a second side of the first busbar, and each of the slave outdoor cabinets is respectively connected to a third side of the first busbar.

2. The energy storage system according to claim 1, characterized in that: The main outdoor cabinet includes a first converter module and a management module; One side of the first converter module is connected to the second side of the first busbar, and the management module is connected to an adjacent slave outdoor cabinet through the other side of the first converter module.

3. The energy storage system according to claim 2, characterized in that: The management module includes a system management unit, a first battery management unit and a switch; Among them, one side of the system management unit is connected to the adjacent outdoor cabinet through the other side of the first converter module, and the other side of the system management unit is connected to the switch; the first battery management unit is connected to the switch.

4. The energy storage system according to claim 3, characterized in that: The system management unit is used to interact with the AC power grid and respond to the needs of the AC power grid, and adjust the charging and discharging strategy based on the battery status data reported by the first battery management unit and the battery status data uploaded from the outdoor cabinet.

5. The energy storage system according to claim 3, characterized in that: The first battery management unit is used to collect battery status data of the main outdoor cabinet and report the collected battery status data to the system management unit.

6. The energy storage system according to claim 3, characterized in that: The slave outdoor cabinet includes a second battery management unit and a second converter module; The second battery management unit is connected to the switch, and the second converter module is connected to the first busbar.

7. The energy storage system according to claim 6, characterized in that: The slave outdoor cabinet also includes a second busbar, and the second converter module is connected to the first busbar via the second busbar.

8. The energy storage system according to claim 6, characterized in that: One side of the second inverter module closest to the main outdoor cabinet is connected to the first inverter module, the other side of the second inverter module closest to the main outdoor cabinet is connected to the adjacent second inverter module, and the remaining second inverter modules are respectively connected to the adjacent second inverter modules.

9. The energy storage system according to any one of claims 1 to 8, characterized in that: One master outdoor cabinet corresponds to four slave outdoor cabinets.

10. The energy storage system according to any one of claims 1 to 8, characterized in that: The main outdoor cabinet is also connected to the communication module and transmits information with the communication module.

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