Control method of energy storage system, battery management system and energy storage system

Abstract

The invention provides a control method of an energy storage system, a battery management system and the energy storage system, and is applied to the technical field of batteries. The method comprises the steps that under the condition that it is determined that a high-voltage power-on condition is met, an isolation switch closing instruction is sent to an isolation switch driving device, and the isolation switch closing instruction is used for instructing the isolation switch driving device to control closing of an isolation switch; and controlling the battery cluster to be electrified in the energy storage system to be electrified under the condition that the disconnecting switch is determined to be closed. According to the embodiment of the invention, the state of the isolation switch is controlled through the control signal, the power-on safety of the battery cluster is improved, the battery cluster is powered on based on the state of the isolation switch, and the stability of the energy storage system is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and more particularly, to a control method for an energy storage system, a battery management system, and an energy storage system. Background Art

[0002] With the rapid development of the energy storage industry market, the commercial application of energy storage has become more and more extensive, mainly concentrated in renewable energy grid connection, frequency modulation auxiliary services, power transmission and distribution, electric vehicle photovoltaic charging stations, and wind and solar power plants.

[0003] The connection and disconnection of the high-voltage circuit of the energy storage system are usually manually adjusted by a disconnector. This manual operation method is relatively dangerous. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a control method for an energy storage system, a battery management system, and an energy storage system, which can control the on-off of the disconnector through signals, improving the safety of controlling the on-off of the high-voltage circuit.

[0005] In a first aspect, the embodiments of this application provide a control method for an energy storage system, including:

[0006] When it is determined that the high-voltage power-on condition is met, send a disconnector closing command to the disconnector driving device, where the disconnector closing command is used to instruct the disconnector driving device to control the disconnector to close;

[0007] When it is determined that the disconnector is closed, control the battery cluster to be powered on in the energy storage system.

[0008] The embodiments of this application control the state of the disconnector through control signals, improving the safety of the battery cluster power-on. Moreover, powering on the battery cluster based on the state of the disconnector improves the stability of the energy storage system.

[0009] In any embodiment, before sending the disconnector closing command to the disconnector driving device, the method further includes:

[0010] Control the disconnector driving device to power on; where the disconnector driving device is arranged between the positive electrode of the battery cluster in the energy storage system and the high-voltage bus.

[0011] The embodiments of this application control the disconnector driving device to power on, making the disconnector driving device in a working state and capable of more reliably responding to the disconnector closing command.

[0012] In any embodiment, controlling the disconnector driving device to power on includes:

[0013] Control the main negative switch and the pre-charge switch on the branch where the battery cluster to be powered on is located to be closed, and supply power to the disconnector drive device through the pre-charge circuit of the battery cluster to be powered on. Among them, the main negative switch is set between the negative electrode of the battery cluster and the negative electrode of the high-voltage bus, and the pre-charge switch is set between the positive electrode of the battery cluster and the positive electrode of the high-voltage bus.

[0014] In the embodiment of the present application, the disconnector drive device is powered by the pre-charge circuits of multiple battery clusters, sharing the current after power-on together, and improving the service life of the pre-charge resistors on each branch.

[0015] In any embodiment, controlling the battery cluster to be powered on in the energy storage system includes:

[0016] When the voltage difference across the main positive switch on the branch where the battery cluster to be powered on is located is less than the first preset voltage difference, control the main positive switch to close and control the pre-charge switch to open to implement the power-on operation of the battery cluster to be powered on.

[0017] In the embodiment of the present application, by first closing the pre-charge switch and the main negative switch, pre-charging the battery cluster through the pre-charge loop to make the voltage of the battery cluster gradually approach the voltage of the high-voltage bus, and then closing the main positive switch, the impact current generated after the main positive switch is closed is reduced, thereby improving the safety of the main positive switch.

[0018] In any embodiment, the method further includes:

[0019] If the voltage difference across the main positive switch is not less than the first preset voltage difference within the preset time after the pre-charge switch is closed, report the power-on failure information.

[0020] In the embodiment of the present application, if the voltage across the main positive switch is still large within the preset time after the pre-charge switch is closed, it indicates that there is a large difference between the voltage of the battery cluster and the voltage of the high-voltage bus. This may be caused by a fault in the battery cluster, a fault in the pre-charge loop, or other faults in the energy storage system. At this time, reporting the power-on failure information can enable the energy storage system to identify and respond to the fault, reduce the possibility of further expansion of the fault, prevent damage to the electrical components on the energy storage system, and improve the reliability of the energy storage system.

[0021] In any embodiment, controlling the main negative switch and the pre-charge switch on the branch where the battery cluster to be powered on is located to be closed includes:

[0022] Control the main negative switch to close;

[0023] After the main negative switch is closed for a preset duration, control the pre-charge switch to close.

[0024] In the embodiment of the present application, by first closing the main negative switch, a stable negative reference potential can be provided for the circuit, and then the pre-charge switch is closed after a certain period of time. The battery is slowly charged through the pre-charge circuit and the pre-charge resistor, which can avoid instantaneous large current impacts and thus protect the electrical components in the circuit.

[0025] In any embodiment, powering on the disconnector driving device includes:

[0026] Sending a power supply instruction to the disconnector driving power supply to enable the disconnector driving power supply to supply power to the disconnector driving device.

[0027] In the embodiment of the present application, the disconnector driving device is powered by a separate power supply, which improves the stability of powering on the disconnector driving device.

[0028] In any embodiment, the high-voltage power-on conditions include:

[0029] Receiving a high-voltage power-on instruction sent by the power controller.

[0030] In any embodiment, the high-voltage power-on conditions further include:

[0031] The number of battery clusters to be powered on is greater than a preset number.

[0032] In the embodiment of the present application, by setting that in the high-voltage power-on conditions, receiving a high-voltage power-on instruction sent by the power controller can reduce the situation of misoperation; the number of battery clusters to be powered on being greater than a preset number can enable the system to have sufficient energy reserves and power output capabilities, reducing the risk of system instability caused by insufficient energy.

[0033] In any embodiment, the following method is used to screen the battery clusters to be powered on from multiple battery clusters:

[0034] Determine a reference voltage according to the voltages of multiple battery clusters;

[0035] Calculate the voltage difference between the voltage of each battery cluster and the reference voltage;

[0036] Determine the battery clusters with a voltage difference less than a second preset voltage difference as the battery clusters to be powered on.

[0037] In the present application, the battery clusters to be powered on are determined by the voltage difference, so that battery clusters with a more balanced voltage distribution can be selected, which helps to reduce voltage fluctuations, improve the consistency of the battery clusters for external work, avoid impact currents, and improve the stability of the energy storage system.

[0038] In any embodiment, the method is applied to the battery management system of the energy storage system. The battery management system includes a primary controller and secondary controllers. Each secondary controller is used to control the electrical components on the branch where the corresponding battery cluster is located. The primary controller is communicatively connected to the secondary controllers and is also communicatively connected to the disconnector drive device.

[0039] Sending a disconnector closing command to the disconnector drive device includes:

[0040] Sending a disconnector closing command to the disconnector drive device through the primary controller.

[0041] Controlling the power-on of the disconnector drive device includes:

[0042] Sending a power-on command to the secondary controller through the primary controller so that the secondary controller controls the power-on of the disconnector drive device.

[0043] In the embodiment of the present application, by setting the primary control and secondary controllers, hierarchical management of the system is achieved, the control process is simplified. Moreover, through the setting of the secondary controller, more refined control and management of specific devices can be carried out, improving the control accuracy of the energy storage system.

[0044] In any embodiment, the method further includes:

[0045] If the disconnector still remains unclosed within a preset time after sending the disconnector closing command, an information on power-on failure is reported.

[0046] In the embodiment of the present application, when it is detected that the disconnector still remains unclosed after the preset time, an information on power-on failure is reported and the power-on operation is stopped, improving the safety of the energy storage system.

[0047] In any embodiment, the method further includes:

[0048] When receiving a high-voltage power-off command, sending a disconnector opening command to the disconnector drive device, where the disconnector opening command is used to instruct the disconnector drive device to control the disconnector to open;

[0049] Controlling the battery cluster in the high-voltage circuit to disconnect the connection with the high-voltage bus.

[0050] The embodiment of the present application also provides a method to disconnect the disconnector through a control signal to implement the power-off operation of the battery cluster, improving the safety of power-off.

[0051] Second aspect, an embodiment of the present application provides a battery management system. The battery management system includes a battery management controller. The battery management controller is configured to send a disconnector closing instruction to a disconnector driving device when it is determined that the high-voltage power-on condition is met. The disconnector closing instruction is used to instruct the disconnector driving device to control the disconnector to close. The disconnector is arranged between the battery cluster of the energy storage system and the high-voltage bus; and, when it is determined that the disconnector is closed, control the battery cluster to be powered on in the energy storage system.

[0052] The battery management system provided by the embodiment of the present application controls the state of the disconnector through a control signal, improving the safety of the battery cluster power-on. Moreover, powering on the battery cluster based on the state of the disconnector improves the stability of the energy storage system.

[0053] In any embodiment, the battery management controller includes a primary controller and a secondary controller. Each secondary controller is configured to control the electrical components on the branch where the corresponding battery cluster is located; the primary controller is communicatively connected to the secondary controller, and the primary controller is communicatively connected to the disconnector driving device.

[0054] The embodiment of the present application realizes hierarchical management of the system by setting two-level controllers, simplifies the control process. Moreover, through the setting of the secondary controller, more refined control and management of specific devices can be performed, improving the control accuracy of the energy storage system.

[0055] Third aspect, an embodiment of the present application provides an energy storage system, including a battery cluster, a battery management system, a disconnector driving device, and a disconnector;

[0056] The disconnector is arranged on the high-voltage bus of the energy storage system, and the disconnector driving device is used to drive the disconnection and connection of the disconnector;

[0057] The battery management system is communicatively connected to the disconnector driving device and the battery cluster;

[0058] The battery management system is configured to execute the method described in the first aspect.

[0059] The embodiment of the present application controls the state of the disconnector through a control signal, improving the safety of the battery cluster power-on. Moreover, powering on the battery cluster based on the state of the disconnector improves the stability of the energy storage system.

[0060] Other features and advantages of the present application will be described in the subsequent description. Moreover, some will become apparent from the description, or can be understood by implementing the embodiments of the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures specifically pointed out in the written description, claims, and drawings. Description of the Drawings

[0061] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0062] Figure 1 It is an architecture diagram of an energy storage system provided by an embodiment of the present application;

[0063] Figure 2 It is a schematic flow chart of the control method of the energy storage system provided by an embodiment of the present application;

[0064] Figure 3 It is a schematic diagram of an energy storage system architecture provided by an embodiment of the present application;

[0065] Figure 4 It is the control flow of the primary controller provided by an embodiment of the present application;

[0066] Figure 5 It is the control flow of the secondary controller provided by an embodiment of the present application;

[0067] Figure 6 It is a schematic flow chart of the high-voltage power-off method provided by an embodiment of the present application. Specific Embodiments

[0068] The following will describe in detail the embodiments of the technical solutions of the present application with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion.

[0070] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two, unless otherwise specifically defined.

[0071] Reference to "embodiments" in this document means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0072] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0073] In the description of the embodiments of this application, the term "a plurality of" refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of sheets" refers to two or more sheets (including two sheets).

[0074] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific situations.

[0075] With the gradual increase in the proportion of new energy units such as wind and solar in China's power system, the DC transmission method, with its advantages of low loss, no capacitance effect, and long transmission distance, has become an important means to ensure the efficient collection, flexible transmission, and decentralized consumption of clean energy on a large scale.

[0076] A battery energy storage system (BESS) is an efficient energy storage and conversion technology. It uses batteries as energy storage carriers, stores electrical energy within a specific time, and supplies electrical energy when needed. Through the electrochemical reaction inside the battery, it converts electrical energy into chemical energy for storage and converts it back into electrical energy when needed. The electrical energy it provides has functions such as smooth transition, peak shaving and valley filling, frequency modulation and voltage regulation, and is of great significance for the stable operation of the power system, the consumption of renewable energy, and fields such as electric vehicles.

[0077] In traditional high-voltage power-on and high-voltage power-off operations of energy storage systems, the isolation switch set on the high-voltage bus is manually closed or opened, which is relatively dangerous and has a certain impact on the stability of the system.

[0078] To solve this technical problem, the embodiments of the present application provide a control method for an energy storage system, a battery management system, and an energy storage system. When high-voltage power-on is required, a closing command for the isolation switch is sent to the isolation switch driving device. After determining that the isolation switch is in the closed state, the battery cluster to be powered on in the energy storage system is controlled to perform high-voltage power-on. This avoids manual operation of the isolation switch and improves safety and system stability.

[0079] It can be understood that the energy storage system provided by the embodiments of the present application can be a fixed energy storage system or a mobile energy storage system. Among them, the fixed energy storage system is usually installed in a fixed position and is directly connected to the power grid, used to balance the power grid load, provide backup power, or support the grid connection of renewable energy. It is mainly applied to power systems, renewable energy power generation stations, industrial parks, etc. The mobile energy storage system is installed on a movable carrier, such as a vehicle or a ship, which is convenient for transfer and use between different locations. The common form is a container type. It is mainly applied to emergency power supply vehicles, ship power systems, power supply in remote areas, etc.

[0080] The energy storage system mainly includes the following parts:

[0081] Energy unit: including battery clusters / battery modules / electrical boxes, which are formed by encapsulating a series of battery cells. The battery cell is the smallest unit of the battery and also the main energy storage device.

[0082] Battery Management System (BMS): The core control device of the energy storage system, responsible for collecting and transmitting the real-time state of the battery cells and accepting the control of other control systems. It mainly monitors parameters such as the voltage, current, and temperature of the battery to ensure the safe operation of the battery and optimize its performance and lifespan.

[0083] Power Conversion System (PCS): PCS is the main energy conversion device, responsible for the conversion between direct current and alternating current. It has certain control functions and can be flexibly configured according to actual needs.

[0084] Energy Management System (EMS) (equipped in some systems): EMS has the function of monitoring, controlling, and optimizing the performance of a power generation or power transmission system. It can be used for small-scale systems, such as microgrids, to help industrial production enterprises reasonably plan and utilize energy while expanding production.

[0085] In addition, the battery energy storage system may also include auxiliary devices such as a temperature control system, a monitoring system, an access control system, a lighting system, a protection system, and a transformer.

[0086] In the battery management system of the energy storage system in the embodiments of the present application, the battery management system is used to control the high-voltage power-on and high-voltage power-off operations of the energy storage system.

[0087] Figure 1 The following is an architecture diagram of an energy storage system provided by an embodiment of the present application. As Figure 1 shown, it mainly includes:

[0088] Multiple parallel-connected battery clusters: Each battery cluster includes multiple battery cells, and the multiple battery cells are connected in parallel, series, or a hybrid connection. It should be noted that in actual applications, the battery cluster can also adopt other forms, such as battery modules, battery cabinets, etc.

[0089] Isolation switch: Used to isolate the high-voltage circuit to ensure that the high-voltage circuit is disconnected from the battery cluster when not in operation. Specifically, it can be an electric isolation switch.

[0090] Isolation switch drive device: Controls the closing and opening of the isolation switch and requires power to operate. The isolation switch drive device can be powered through each pre-charge branch or through a separate power supply.

[0091] Main positive switch: Connects the positive electrode of the battery cluster to the high-voltage bus.

[0092] Main negative switch: Connects the negative electrode of the battery cluster to the high-voltage bus.

[0093] Pre-charge switch: Before the main positive switch is closed, pre-charges the battery cluster through the pre-charge circuit to reduce the large current impact.

[0094] Pre-charge resistor: Used in the pre-charge circuit to reduce the voltage difference when the main positive switch is closed.

[0095] It should be noted that the main positive switch, the main negative switch, and the pre-charge switch can specifically be relays, or can also be solid-state relays (SSR), IGBTs, DC contactors, etc.

[0096] Figure 2 The following is a schematic flowchart of a control method for an energy storage system provided by an embodiment of the present application. As Figure 2 shown, the method includes:

[0097] Step 201: When it is determined that the high-voltage power-on condition is met, send an isolation switch closing command to the isolation switch drive device, and this isolation switch closing command is used to instruct the isolation switch drive device to control the isolation switch to close;

[0098] Step 202: When it is determined that the isolation switch is closed, control the battery cluster to be powered on in the energy storage system.

[0099] In step 201, the high-voltage power-on conditions are pre-set, which may specifically include: the battery management system receives the high-voltage power-on instruction sent by the power controller, and may also include that the battery management system determines that the current energy storage system is in a normal operating state without faults. It may also include that in the current energy storage system, the number of battery clusters that meet the condition of providing electrical energy externally reaches a certain amount, or that environmental conditions such as temperature and humidity in the energy storage system meet the preset requirements, etc. The specific high-voltage power-on conditions can be set according to actual needs. High-voltage power-on means connecting some or all of the battery clusters in the energy storage system to the high-voltage bus for power transmission.

[0100] The control area disconnector drive device is connected by wired or wireless means. When the battery management system determines that the high-voltage power-on conditions are met, it sends a disconnector closing instruction to the disconnector drive device. This disconnector closing instruction is used to instruct the disconnector drive device to control the disconnector to close. The disconnector drive device includes an electric operating mechanism, which is responsible for providing the required force or power for the disconnector so that it can perform opening or closing operations as required. The electric operating mechanism usually drives the disconnector main shaft to perform opening, closing, and tripping operations through a reduction device driven by a drive motor, improving the convenience and efficiency of operation.

[0101] In step 202, the battery management system determines whether to continue with the subsequent high-voltage power-on operation by receiving the status of the disconnector feedback from the disconnector drive device. It can be understood that the disconnector drive device can detect the disconnector status through current detection, voltage detection, or a dedicated signal sensor. When the battery management system receives that the disconnector is in the closed state, it controls the battery clusters to be powered on in the energy storage system to perform high-voltage power-on operations. Among them, the battery clusters to be powered on can be one or more randomly selected from the energy storage system, or selected according to certain selection conditions.

[0102] The embodiment of the present application controls the status of the disconnector through control signals, improving the safety of battery cluster power-on. Moreover, powering on the battery clusters based on the status of the disconnector improves the stability of the energy storage system.

[0103] Based on the above embodiments, before sending the disconnector closing instruction to the disconnector drive device, the method further includes:

[0104] Power on the disconnector drive device; where the disconnector drive device is arranged between the positive electrode of the battery cluster in the energy storage system and the high-voltage bus.

[0105] In a specific implementation process, for the case where the disconnector driving device is powered through each pre-charge branch, the disconnector driving device is initially in a power-off state. To enable the disconnector driving device to be in a state where it can receive and execute instructions, and thus enable the disconnector driving device to receive the disconnector closing instruction, the disconnector driving device can be powered on first. Specifically, the pre-charge switch and the main negative switch on the branch where the battery cluster to be powered on is located can be closed, so that the pre-charge branch is connected. After connection, power can be supplied to the disconnector driving device.

[0106] In the embodiment of the present application, by controlling the disconnector driving device to be powered on, the disconnector driving device is in a workable state and can respond to the disconnector closing instruction more reliably.

[0107] In another embodiment, the disconnector driving device can be powered by a separate power source, so that the disconnector driving device is always in a working state. In this case, the battery management system can directly send the disconnector closing instruction to the disconnector driving device. The separate power source for powering the disconnector driving device can also start to power the disconnector driving device after receiving the power supply instruction sent by the battery management system. Therefore, the battery management system can first send the power supply instruction to the separate power source, and after determining that the disconnector driving device is powered on, then send the disconnector closing instruction to the disconnector driving device.

[0108] In addition, a backup battery can be provided in the energy storage system. Specifically, a small-capacity backup battery or a super capacitor can be used to power the disconnector driving device to ensure that it can also work when the high-voltage system is not powered on.

[0109] Based on the above embodiments, controlling the disconnector driving device to be powered on includes:

[0110] Controlling the main negative switch and the pre-charge switch on the branch where the battery cluster to be powered on is located to be closed, and powering the disconnector driving device through the pre-charge circuit of the battery cluster to be powered on. Among them, the main negative switch is arranged between the negative electrode of the battery cluster and the negative electrode of the high-voltage bus, and the pre-charge switch is arranged between the positive electrode of the battery cluster and the positive electrode of the high-voltage bus.

[0111] In a specific implementation process, refer to Figure 1, each branch where a battery cluster is located includes a pre-charge circuit. The pre-charge circuit includes a pre-charge switch and a pre-charge resistor. Among them, the pre-charge switch is used to pre-charge the battery cluster through the pre-charge circuit before the main positive switch is closed, reducing the inrush current when the main positive switch is closed and protecting the battery and electrical components. After the pre-charge switch is closed, the pre-charge resistor will pre-charge the battery cluster with a relatively low current, making the voltage of the battery cluster gradually approach the high-voltage bus voltage, thereby reducing the voltage difference when the main positive switch is closed. Among them, the pre-charge resistor can be a single high-power resistor, multiple low-power resistors in parallel, or an adjustable pre-charge resistor. Among them, a single high-power resistor is suitable for the case where there is less battery cluster data. Multiple low-power resistors in parallel are suitable for the case where there are more battery clusters, which can disperse heat and improve the service life of the resistor. The adjustable pre-charge resistor can adjust the resistance value according to actual needs to optimize the pre-charge current.

[0112] The battery management system can control the main negative switch and the pre-charge switch on the branch where the battery cluster to be powered on is located to be closed. After being closed, it provides a power supply path for the disconnector drive device, so that the disconnector drive device is powered on.

[0113] It should be noted that a pre-charge resistor is also provided on the pre-charge circuit of each battery cluster. The setting of the pre-charge resistor can reduce the inrush current, thereby protecting the battery cluster. And for the case of multiple battery clusters to be powered on, since each battery cluster corresponds to a pre-charge circuit, the inrush current can be shared to protect the pre-charge resistor.

[0114] In the embodiment of the present application, the pre-charge circuits of multiple battery clusters are used to supply power to the disconnector drive device, sharing the current after power-on together, and improving the service life of the pre-charge resistors on each branch.

[0115] In addition, the main negative switch and the pre-charge switch can be closed simultaneously, or the main negative switch can be closed first, and after a preset time, such as 10 ms, etc., after closing the main negative switch, the pre-charge switch is closed. In the embodiment of the present application, by closing the main negative switch first, a stable negative reference potential can be provided for the circuit, and after a certain time, the pre-charge switch is closed, and the battery is slowly charged through the pre-charge circuit and the pre-charge resistor, which can avoid instantaneous large current impact, thereby protecting the electrical components in the circuit.

[0116] Based on the above embodiments, controlling the battery cluster to be powered on in the energy storage system includes:

[0117] When the voltage difference across the main positive switch on the branch where the battery cluster to be powered on is located is less than the first preset voltage difference, control the main positive switch to be closed and control the pre-charge switch to be disconnected to implement the power-on operation of the battery cluster to be powered on.

[0118] In a specific implementation process, after closing the pre-charge switch and the main negative switch, the voltage across the main positive switch is relatively large at the beginning. If the main positive switch is directly closed, it will cause current imbalance in the circuit. Under normal circumstances, the voltage difference across the main positive switch will gradually decrease. For safety considerations, when it is detected that the voltage difference across the main positive switch is less than the first preset voltage difference, the main positive switch can be controlled to close, and the pre-charge switch can be controlled to open. After the isolation switch, the main positive switch, and the main negative switch are closed, the battery cluster is connected to the high-voltage bus, thus achieving power-on.

[0119] In the embodiment of the present application, by first closing the pre-charge switch and the main negative switch, the battery cluster is pre-charged through the pre-charge circuit, so that the voltage of the battery cluster gradually approaches the voltage of the high-voltage bus, and then the main positive switch is closed, reducing the excessive inrush current generated after the main positive switch is closed, thereby improving the safety of the main positive switch.

[0120] Based on the above embodiment, the method further includes:

[0121] If the voltage difference across the main positive switch is not less than the first preset voltage difference within the preset time after closing the pre-charge switch, an information indicating power-on failure is reported.

[0122] In a specific implementation process, after closing the main negative switch and the pre-charge switch, timing can start. If the voltage difference across the main positive switch is not less than the first preset voltage difference within the preset time, it may indicate a fault in the energy storage system. At this time, the power-on operation should not be continued, and the battery management system can report an information indicating power-on failure.

[0123] The battery management system can also perform a power-off operation, that is, disconnect the isolation switch, as well as the already closed main negative switch and pre-charge switch.

[0124] In the embodiment of the present application, if the voltage across the main positive switch is still relatively large within the preset time after closing the pre-charge switch, it indicates that there is a large difference between the voltage of the battery cluster and the voltage of the high-voltage bus. This may be caused by a fault in the battery cluster, a fault in the pre-charge circuit, or other faults in the energy storage system. At this time, reporting an information indicating power-on failure can enable the energy storage system to identify and respond to the fault, reducing the possibility of further expansion of the fault, preventing damage to the electrical components on the energy storage system, and improving the reliability of the energy storage system.

[0125] Based on the above embodiment, the high-voltage power-on conditions include:

[0126] Receiving a high-voltage power-on instruction sent by the power controller.

[0127] In the specific implementation process, the power controller is a key device in the energy storage system. It precisely controls whether the battery is charged or discharged and the charging and discharging power according to the requirements of the energy storage system and the battery state. Therefore, one of the high-voltage power-on conditions includes whether a high-voltage power-on instruction sent by the power controller is received.

[0128] In addition, the high-voltage power-on condition can also include: the number of battery clusters to be powered on is greater than a preset number. Among them, the following method can be used to determine whether a battery cluster meets the power-on requirement:

[0129] The battery management system can obtain the voltages of each battery cluster in the energy storage system. If the voltage differences between more than a certain number of battery clusters are less than a preset voltage difference, then these battery clusters are the battery clusters to be powered on, and high-voltage power-on will be performed on these battery clusters subsequently.

[0130] Specifically, the voltages of multiple battery clusters can be sorted, and then the reference voltage can be determined from the sorting. In the energy storage system, when determining the battery clusters to be powered on, multiple factors are usually considered, including safety, balance, system stability, and startup speed. Different application scenarios may choose different reference voltage methods. For example, the voltage of the battery cluster in the middle position can be used as the reference voltage, or the voltage of any battery cluster in the sorting can be used as the reference voltage, or the average voltage of multiple battery clusters can be used as the reference voltage, etc. Among them, in the case of selecting the larger voltage in the sorting as the reference voltage, the system can be started as soon as possible, reducing the pre-charging time. And during the pre-charging process, the voltage difference between the battery cluster with a higher voltage and the voltage of the system high-voltage bus is smaller, and the risk of inrush current is lower. In the case of selecting the smaller voltage in the sorting as the reference voltage, it requires a longer pre-charging time, so that the battery cluster can reach a relatively high voltage before the main positive switch is closed, reducing the unbalanced current and improving the stability of the energy storage system. In the case of selecting the voltage in the middle position of the sorting as the reference voltage, the voltage of the battery cluster in the middle value is relatively average, and the current distribution is more balanced during the pre-charging process, making the energy storage system more stable.

[0131] After determining the reference voltage, calculate the voltage difference between the voltage of each battery cluster and the reference voltage;

[0132] Determine the battery clusters with a voltage difference less than the second preset voltage difference as the battery clusters to be powered on. Among them, the specific value of the second preset voltage difference can be set according to the actual situation.

[0133] By determining the battery clusters to be powered on through the above voltage difference, battery clusters with a more balanced voltage distribution can be selected, which helps to reduce voltage fluctuations, improve the consistency of the battery clusters for external work, avoid inrush current, and improve the stability of the energy storage system.

[0134] Under different scenarios, the number of battery clusters that need to be powered on at high voltage is different. Therefore, the number of battery clusters to be powered on each time can be preset. If the number of battery clusters to be powered on is greater than the preset number (for example: 4, etc.), it means that one of the high-voltage power-on conditions is met.

[0135] It should be noted that the high-voltage power-on conditions may also include: the battery management system monitors that there are no fire faults and cell abnormalities (including cell overvoltage, cell undervoltage, etc.) in the energy storage system.

[0136] In the embodiment of the present application, by setting in the high-voltage power-on conditions that a high-voltage power-on instruction sent by the power controller is received, the situation of misoperation can be reduced; if the number of battery clusters to be powered on is greater than the preset number, it can enable the system to have sufficient energy reserves and power output capabilities, and reduce the risk of system instability caused by insufficient energy. On the basis of the above embodiment, the energy storage system includes a primary controller and secondary controllers, and each secondary controller is used to control the electrical components on the branch where the corresponding battery cluster is located; the primary controller is communicatively connected to the secondary controllers, and the primary controller is communicatively connected to the disconnector driving device;

[0137] Sending a disconnector closing instruction to the disconnector driving device includes:

[0138] Sending a disconnector closing instruction to the disconnector driving device through the primary controller;

[0139] Controlling the disconnector driving device to be powered on includes:

[0140] Sending a power-on instruction to the secondary controller through the primary controller so that the secondary controller controls the disconnector driving device to be powered on.

[0141] Figure 3 A schematic diagram of an energy storage system architecture provided by an embodiment of the present application is shown in Figure 3 As shown, the battery management system in this energy storage system may include a battery management controller, and the battery management controller includes a primary controller (BMC) and multiple secondary controllers (SBMU). Among them, each battery cluster corresponds to a secondary controller, and the primary controller and the secondary controllers communicate with each other. The primary controller is responsible for the management and signal sending of the overall high-voltage control process. The secondary controller is used to control the electrical components on the branch where the corresponding battery cluster is located. For example: it can control the opening and closing of the main positive switch, the main negative switch, and the precharge switch. The communication between the primary controller and the secondary controllers and the disconnector driving device can adopt communication protocols such as CAN bus, Ethernet, and Modbus.

[0142] The primary controller is also communicatively connected to a power controller (SMC) and an isolator switch drive board. The primary controller can receive a high-voltage power-on command sent by the power controller. After receiving the high-voltage power-on command, the primary controller can further determine whether the energy storage system currently meets the high-voltage power-on conditions (because there may be system failures). If the high-voltage power-on conditions are met, a switch closing command is sent to the isolator switch drive device.

[0143] If the isolator switch drive device is powered by the pre-charge circuit of the battery cluster, then the primary controller can first send a power-on command to the secondary controller corresponding to the battery cluster to be powered on, so that the secondary controller closes the main negative switch and the pre-charge switch, thereby powering on the isolator switch drive device.

[0144] Figure 4 This is the control flow of the primary controller provided by the embodiment of the present application. Figure 5 This is the control flow of the secondary controller provided by the embodiment of the present application. As Figure 4 and Figure 5 shown:

[0145] Step 401: The primary controller receives the high-voltage power-on command sent by the power controller;

[0146] Step 402: Determine whether the number of battery clusters that meet the power-on conditions is greater than a preset number; if the number of battery clusters that meet the power-on conditions is greater than the preset number, the primary controller broadcasts and sends a high-voltage power-on command to the secondary controller, and executes the Figure 5 process. Otherwise, report the high-voltage power-on failure information. It should be noted that the method for determining the battery clusters that meet the power-on conditions can be referred to the above embodiments and will not be elaborated here.

[0147] Step 403: Send an isolator switch closing command; after receiving the high-voltage power-on command and determining that the high-voltage power-on conditions are met, the primary controller can start timing, and send an isolator switch closing command to the isolator switch drive board after timeout.

[0148] Step 404: Determine whether the isolator switch is closed; the primary controller determines whether the isolator switch is closed. If it is closed, execute the Figure 5 step process; if it is not closed, execute Step 405.

[0149] Step 405: Whether it times out; start timing from the moment the isolator switch closing command is sent, and determine whether the current time exceeds the set timeout duration; if the timeout duration is exceeded and the isolator switch is not closed, execute Step 406; if it does not time out, continue to execute Step 404. The timeout duration can be set to 3 seconds, 4 seconds, etc.

[0150] Step 406: Report the failure of the isolator switch to close and perform a high-voltage power-off operation.

[0151] Figure 5 The specific steps are as follows:

[0152] Step 501: The secondary controller closes the main negative switch and the pre-charge switch; In order to power on the disconnector drive device, the secondary controller can close the main negative switch and the pre-charge switch. When closing, the main negative switch can be closed first, and after a preset time, the pre-charge switch can be closed.

[0153] Step 502: Determine whether the disconnector is closed; The primary controller sends the status of the disconnector to the secondary controller, and the secondary controller determines whether the disconnector is closed. If the disconnector has been closed, step 503 is executed.

[0154] Step 503: Determine whether the voltage across the main positive switch is less than the first preset voltage difference and whether it times out; After receiving the message that the disconnector is closed and after closing the pre-charge switch, start timing. If the current time exceeds the preset first duration and the voltage difference across the main positive switch is less than the first preset voltage difference, step 505 is executed; if the voltage difference across the main positive switch is not less than the first preset voltage difference, step 504 is executed. The timeout time in this step can be set between 500 ms and 10 s. The first preset voltage difference can be set according to the actual situation, for example, it can be 5 V, 10 V, etc.

[0155] Step 504: Determine whether it times out; After receiving the message that the disconnector is closed and after closing the pre-charge switch, start timing. If the current time exceeds the preset second duration, step 507 is executed; if it does not exceed the second duration, step 503 is continued to be executed. The timeout time in this step can be greater than the timeout time in step 503.

[0156] Step 505: Close the main positive switch and disconnect the pre-charge switch;

[0157] Step 506: Report to the primary controller that the high-voltage power-on is completed;

[0158] Step 507: Report to the primary controller that the high-voltage power-on fails.

[0159] It should be noted that during the high-voltage power-on process, the energy storage system can set some safety protection mechanisms, such as:

[0160] Overvoltage protection: During the high-voltage process, if it is detected that the battery cluster voltage exceeds the preset safety range, the high-voltage operation should be stopped immediately.

[0161] Overcurrent protection: When the main positive switch is closed, if it is detected that the current exceeds the preset safety range, the main positive switch should be disconnected immediately to prevent damage to the electrical components.

[0162] Temperature protection: Monitor the temperatures of the battery and electrical components. If they exceed the safe range, the operation should be stopped immediately to prevent safety issues caused by overheating.

[0163] In the embodiments of this application, by setting a primary controller and a secondary controller, hierarchical management of the system is achieved, the control process is simplified. Moreover, through the setting of the secondary controller, more precise control and management of specific devices can be carried out, improving the control accuracy of the energy storage system.

[0164] The embodiments of this application also provide a method for high-voltage power-off. For details, please refer to Figure 6 , and this high-voltage power-off method includes:

[0165] Step 601: When receiving a high-voltage power-off instruction, send a disconnection instruction for the disconnector to the disconnector driving device, so that the disconnector driving device controls the disconnector to disconnect.

[0166] Step 602: Control the battery cluster in the high-voltage circuit to disconnect from the high-voltage bus.

[0167] In the specific implementation process, the high-voltage power-off instruction can be sent by the power controller to the battery management system, or can be automatically generated by the battery management system. Among them, the scenarios where the battery management system automatically generates a high-voltage power-off instruction include but are not limited to: during the high-voltage power-on process, the disconnector fails to close within a preset time period. At this time, the battery management system can generate a high-voltage power-off instruction to execute the high-voltage power-off process. Another example is that after closing the pre-charge switch and the main negative switch, the voltage difference across the main positive switch does not become less than the first preset voltage difference within a preset time duration, and the battery management system will also generate a high-voltage power-off instruction. Additionally, when the battery management system detects a fault in the energy storage system, it can also generate a high-voltage power-off instruction.

[0168] After determining to perform high-voltage power-off, the battery management system sends a disconnection instruction for the disconnector to the disconnector driving device and starts timing.

[0169] After receiving this disconnection instruction for the disconnector, the disconnector driving device normally controls the disconnector to disconnect. However, in some cases, there may be a situation where the disconnector fails to disconnect.

[0170] For the case where the disconnector disconnects within the preset time, the battery management system controls the battery cluster in the high-voltage circuit to disconnect from the high-voltage bus. At this time, it indicates that the high-voltage power-off is completed.

[0171] For the case where the disconnector does not disconnect within the preset time, the battery management system still controls the battery cluster in the high-voltage circuit to disconnect from the high-voltage bus, and reports the message that the disconnector fails to disconnect.

[0172] For the case where the battery management controller includes a primary controller and a secondary controller, after determining to execute the high-voltage power-down process, the primary controller sends a disconnection command for the disconnector to the disconnector driving device. And, the primary controller detects whether the disconnector is disconnected. However, regardless of whether the disconnector is disconnected or not, a high-voltage power-down command is sent to the secondary controller. After receiving the high-voltage power-down command, the secondary controller controls the main positive switch and the main negative switch to disconnect, so as to disconnect the battery cluster from the high-voltage bus and achieve high-voltage power-down.

[0173] The embodiment of the present application also provides a method for disconnecting the disconnector through a control signal to implement the power-down operation of the battery cluster, improving the safety of power-down.

[0174] The embodiment of the present application provides a battery management system. The battery management system includes a battery management controller, which is mainly used for sending a closing command for the disconnector to the disconnector driving device when determining that the high-voltage power-on condition is satisfied. The closing command for the disconnector is used to instruct the disconnector driving device to control the disconnector to close. The disconnector is arranged between the battery cluster of the energy storage system and the high-voltage bus; and, when determining that the disconnector is closed, controlling the battery cluster to be powered on in the energy storage system.

[0175] Based on the above embodiment, the battery management controller may include a primary controller and a secondary controller. The primary controller is communicatively connected to the secondary controller. The primary controller is also communicatively connected to the power controller, and the primary controller is communicatively connected to the disconnector driving device. The primary controller is used to receive some commands sent by the power controller, such as high-voltage power-on command, high-voltage power-down command, etc. When the primary controller receives the high-voltage power-on command sent by the power controller and detects that the high-voltage power-on condition is satisfied, a closing command for the disconnector is sent to the disconnector driving device. For the case where the disconnector driving device is not powered on, the disconnector driving device can be controlled to be powered on first. The specific power-on method can refer to the above embodiment. After the disconnector is closed, the primary controller broadcasts a high-voltage power-on command to the secondary controller. After receiving the high-voltage power-on command, the secondary controller controls the main negative switch and the pre-charge switch on the corresponding battery cluster branch to close. When the voltage difference across the main positive switch is detected to be less than a certain value, the main positive switch is closed and the pre-charge switch is disconnected, thereby realizing the high-voltage power-on process of the battery cluster.

[0176] Based on the above embodiment, the battery management controller is also used to control the disconnector driving device to be powered on; wherein the disconnector driving device is arranged between the positive electrode of the battery cluster of the energy storage system and the high-voltage bus.

[0177] Based on the above embodiment, when the secondary controller controls the battery cluster to be powered on, it is specifically used for:

[0178] Control the main negative switch and the pre-charge switch on the branch where the battery cluster to be powered on is located to close, and supply power to the disconnector drive device through the pre-charge circuit of the battery cluster to be powered on. Among them, the main negative switch is set between the negative electrode of the battery cluster and the negative electrode of the high-voltage bus, and the pre-charge switch is set between the positive electrode of the battery cluster and the positive electrode of the high-voltage bus.

[0179] Based on the above embodiment, the secondary controller is specifically used for:

[0180] When the voltage difference across the main positive switch on the branch where the battery cluster to be powered on is located is less than the first preset voltage difference, control the main positive switch to close and control the pre-charge switch to open to implement the power-on operation of the battery cluster to be powered on.

[0181] Based on the above embodiment, the secondary controller is further used for:

[0182] If the voltage difference across the main positive switch is not less than the first preset voltage difference within the preset time after the pre-charge switch is closed, report the power-on failure information.

[0183] Based on the above embodiment, when the secondary controller closes the main negative switch and the pre-charge switch, the following steps can be specifically adopted:

[0184] Control the main negative switch to close;

[0185] After the main negative switch is closed for a preset duration, control the pre-charge switch to close.

[0186] Based on the above embodiment, the high-voltage power-on conditions include:

[0187] Receive the high-voltage power-on instruction sent by the power controller.

[0188] The high-voltage power-on conditions may further include:

[0189] The number of battery clusters to be powered on is greater than the preset number.

[0190] Based on the above embodiment, the following method is used to screen the battery clusters to be powered on from multiple battery clusters:

[0191] Sort according to the voltages of multiple battery clusters, and use the voltage of the battery cluster in the middle position as the reference voltage;

[0192] Calculate the voltage difference between the voltage of each battery cluster and the reference voltage;

[0193] Determine the battery clusters with a voltage difference less than the second preset voltage difference as the battery clusters to be powered on.

[0194] Based on the above embodiment, the primary controller may further be used for: if the disconnector still fails to close within the preset time after sending the disconnector closing instruction, report the power-on failure information.

[0195] Based on the above embodiments, the battery management controller is further configured to:

[0196] When receiving a high-voltage power-off command, send a disconnector opening command to the disconnector driving device, where the disconnector opening command is used to instruct the disconnector driving device to control the disconnector to disconnect;

[0197] Control the battery cluster in the high-voltage circuit to disconnect the connection with the high-voltage bus.

[0198] In the embodiments provided in the present application, it should be understood that the disclosed device and method can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some communication interfaces, and the indirect coupling or communication connection of the device or unit may be in electrical, mechanical or other forms.

[0199] In addition, the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0200] Furthermore, in each embodiment of the present application, the functional modules can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0201] In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0202] The above are only the embodiments of the present application and are not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for an energy storage system, characterized in that: include: When it is determined that the high-voltage power-on condition is met, sending an isolating switch closing instruction to the isolating switch driving device, wherein the isolating switch closing instruction is used to instruct the isolating switch driving device to control the isolating switch to close; When it is determined that the isolation switch is closed, the battery cluster to be powered on in the energy storage system is controlled to be powered on.

2. The method according to claim 1, characterized in that: Before sending the isolating switch closing instruction to the isolating switch driving device, the method further includes: The isolating switch driving device is controlled to be powered on; wherein the isolating switch driving device is arranged between the positive electrode of the battery cluster and the high-voltage bus of the energy storage system.

3. The method according to claim 2, characterized in that The controlling the isolating switch driving device to power on comprises: The main negative switch and the pre-charge switch on the branch where the battery cluster to be powered on is located are controlled to be closed, and the isolating switch driving device is powered by the pre-charge circuit of the battery cluster to be powered on, wherein the main negative switch is arranged between the negative electrode of the battery cluster and the negative electrode of the high-voltage bus, and the pre-charge switch is arranged between the positive electrode of the battery cluster and the positive electrode of the high-voltage bus.

4. The method according to any one of claims 1 to 3, characterized in that: The controlling the battery cluster to be powered on in the energy storage system to power on includes: When the voltage difference across the main positive switch on the branch where the battery cluster to be powered on is located is less than a first preset voltage difference, the main positive switch is controlled to be closed and the pre-charge switch is controlled to be opened to power on the battery cluster to be powered on.

5. The method according to claim 4, characterized in that The method further comprises: If the voltage difference across the main positive switch is not less than the first preset voltage difference within a preset time after the pre-charging switch is closed, power-on failure information is reported.

6. The method according to any one of claims 3 to 5, characterized in that: The controlling the main negative switch and the pre-charging switch on the branch where the battery cluster to be powered on is located to be closed includes: Controlling the main negative switch to close; After the main negative switch is closed for a preset time, the pre-charge switch is controlled to be closed.

7. The method according to any one of claims 2 to 6, characterized in that: The controlling the isolating switch driving device to power on comprises: A power supply instruction is sent to the isolating switch driving power supply so that the isolating switch driving power supply supplies power to the isolating switch driving device.

8. The method according to any one of claims 1 to 7, characterized in that: The high voltage power-on conditions include: Receive a high voltage power-on command sent by a power controller.

9. The method according to claim 8, characterized in that The high voltage power-on condition also includes: The number of battery clusters to be powered on is greater than a preset number.

10. The method according to claim 9, characterized in that The battery cluster to be powered on is selected from multiple battery clusters by the following method: calculating the voltage difference between the voltage of each battery cluster and the reference voltage; The battery cluster whose voltage difference is smaller than the second preset voltage difference is determined as the battery cluster to be powered on.

11. The method according to any one of claims 1 to 10, characterized in that: The method is applied to a battery management system of the energy storage system, wherein the battery management system includes a primary controller and a secondary controller, each of the secondary controllers being used to control electrical components on a branch where a corresponding battery cluster is located; the primary controller is communicatively connected to the secondary controller, and the primary controller is communicatively connected to the isolating switch driving device; The sending of the isolating switch closing instruction to the isolating switch driving device comprises: Sending the isolating switch closing instruction to the isolating switch driving device through the primary controller; The controlling the isolating switch driving device to power on comprises: Sending a power-on instruction to the secondary controller through the primary controller; The secondary controller responds to the power-on instruction to control the isolating switch driving device to power on.

12. The method according to any one of claims 1 to 11, characterized in that: The method further comprises: If the isolating switch is still not closed within a preset time after the isolating switch closing instruction is sent, power-on failure information is reported.

13. The method according to any one of claims 1 to 12, characterized in that: The method further comprises: In the case of receiving a high-voltage power-off instruction, sending an isolating switch opening instruction to the isolating switch driving device, wherein the isolating switch opening instruction is used to instruct the isolating switch driving device to control the isolating switch to be disconnected; The battery cluster in the high-voltage circuit is controlled to be disconnected from the high-voltage bus.

14. A battery management system, characterized in that: The battery management system includes a battery management controller, which is used to send an isolating switch closing instruction to the isolating switch driving device when it is determined that the high-voltage power-on condition is met, and the isolating switch closing instruction is used to instruct the isolating switch driving device to control the isolating switch to close; The isolating switch is arranged between the battery cluster and the high voltage bus of the energy storage system; and when it is determined that the isolating switch is closed, the battery cluster to be powered on in the energy storage system is controlled to be powered on.

15. The battery management system according to claim 14, characterized in that: The battery management controller includes a primary controller and a secondary controller, each of the secondary controllers is used to control the electrical components on the branch where the corresponding battery cluster is located; the primary controller is communicatively connected to the secondary controller, and the primary controller is communicatively connected to the isolation switch drive device.

16. An energy storage system, characterized in that: The battery cluster and battery management system, isolating switch driving device and isolating switch; The isolating switch is arranged on the high-voltage bus of the energy storage system, and the isolating switch driving device is used to drive the on and off of the isolating switch; The battery management system is communicatively connected with the isolation switch driving device and the battery cluster; The battery management system is used to execute the method according to any one of claims 1-13.

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