High-voltage box, and electrical control system and method for energy storage battery cluster

Abstract

Provided in the present application are a high-voltage box, and an electrical control system and method for an energy storage battery cluster. The high-voltage box comprises a main positive circuit, a main negative circuit and a pre-charging circuit, and further comprises a pre-charging resistor and an integrated switch, wherein the integrated switch is provided with a first contact, a second contact, a third contact and a fourth contact; the first contact is connected to the main positive circuit, and the second contact and the fourth contact are connected in parallel and then connected to the main negative circuit; the pre-charging resistor and the third contact are connected in series in the pre-charging circuit, and the pre-charging circuit is connected across the first contact in parallel; and the first contact and the second contact are interlocked, and the third contact and the fourth contact are also interlocked. The high-voltage box of the present application reduces the number of components, thereby also reducing the cost.

Description

High voltage box, electrical control system and method for energy storage battery cluster TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, and in particular to a high voltage box, an electrical control system and a method for an energy storage battery cluster. BACKGROUND

[0002] With the rapid development of new energy vehicles and energy storage technology, the safety, reliability and efficiency of battery clusters as key energy storage units are increasingly valued by people.

[0003] As a core component connecting the battery cluster and the energy storage converter, the high voltage box plays a crucial role in power transmission, control and protection. The traditional high voltage box primary circuit design includes multiple electrical components, such as circuit breakers, main positive contactors, main negative contactors, pre-charge contactors, fuses, and pre-charge resistors. These components each bear important functions such as electrical isolation, on-off control, short circuit protection, and pre-charge.

[0004] However, the traditional high voltage box components not only have a large number (usually six or more), directly leading to the rise of high voltage box costs, but also occupy a large installation space, and the complex connection of multiple components also increases the system failure rate and maintenance difficulty. SUMMARY

[0005] The present application provides a high voltage box, an electrical control system and a method for an energy storage battery cluster to solve the problem of multiple components and high cost of the prior art high voltage box.

[0006] In a first aspect, the present application provides a high voltage box, comprising: a main positive circuit, a main negative circuit and a pre-charge circuit, the high voltage box comprising a pre-charge resistor and a fusion switch;

[0007] The fusion switch is provided with a first contact, a second contact, a third contact and a fourth contact;

[0008] The first contact is connected to the main positive circuit, and the second contact and the fourth contact are connected in parallel to the main negative circuit;

[0009] The pre-charge resistor and the third contact are connected in series in the pre-charge circuit, and the pre-charge circuit is connected across the first contact;

[0010] The first contact is linked to the second contact, and the third contact is linked to the fourth contact.

[0011] In some embodiments, the main positive circuit further has a first fuse connected in series; and the main negative circuit further has a second fuse connected in series.

[0012] In some embodiments, the first contact, the second contact, the third contact and the fourth contact are all mechanical contacts.

[0013] In some embodiments, the main negative loop is further connected in series with a shunt.

[0014] In some embodiments, the main negative loop is further connected in series with a Hall sensor.

[0015] In some embodiments, the main negative loop is further connected in series with a Hall sensor.

[0016] The fusion switch is provided with a first contact, a second contact, a third contact and a fourth contact.

[0017] The first contact is connected to the main positive loop, and the second contact and the fourth contact are connected in parallel to the main negative loop.

[0018] The pre-charging resistor and the third contact are connected in series in the pre-charging loop, and the pre-charging loop is connected in parallel across the first contact.

[0019] The first contact is connected to the second contact, and the third contact is connected to the fourth contact.

[0020] In some embodiments, the method further comprises:

[0021] Determining a voltage difference between the highest voltage and the lowest voltage of the total voltage of the battery cluster.

[0022] When the voltage difference is less than or equal to a first preset threshold, the first contact and the second contact are closed.

[0023] In some embodiments, the method further comprises:

[0024] When the voltage difference is greater than the first preset threshold and less than a second preset threshold, the first contact and the second contact are opened, the third contact and the fourth contact are closed, and the first contact and the second contact are closed when the voltage difference is less than or equal to the first preset threshold, and the third contact and the fourth contact are opened after a preset time.

[0025] In some embodiments, after the third contact and the fourth contact are closed, the method further comprises:

[0026] When the pre-charging fails, the third contact and the fourth contact are opened.

[0027] In some embodiments, after the first contact and the second contact are closed, the method further comprises:

[0028] When the energy storage battery cluster electrical control system fails, the first contact and the second contact are opened. Advantages

[0029] The high-voltage box, the energy storage battery cluster electrical control system and the method provided by the application replace the circuit breaker, the main positive contactor, the main negative contactor and the pre-charging contactor in the traditional high-voltage box by setting the fusion switch, realize the original functions of the high-voltage box, reduce the number of components in the high-voltage box, reduce the cost and improve the wiring efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0031] Fig. 1 is a structural schematic diagram of a high-voltage box in the prior art;

[0032] Fig. 2 is a structural schematic diagram of a high-voltage box provided by an embodiment of the application;

[0033] Fig. 3 is a structural schematic diagram of another high-voltage box provided by an embodiment of the application.

[0034] Reference signs: 10, main positive loop; 11, first fuse; 12, main positive contactor; 20, main negative loop; 21, second fuse; 22, shunt; 23, main negative contactor; 24, Hall sensor; 30, pre-charging loop; 31, pre-charging resistor; 32, pre-charging contactor; 40, circuit breaker; 50, fusion switch; 51, first contact; 52, second contact; 53, third contact; 54, fourth contact. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the application more clear, the technical solutions in the application will be clearly and completely described below in combination with the drawings in the application. Obviously, the described embodiments are some embodiments of the application, not all embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0036] The terms "first", "second" and the like in the specification and claims of the application and the above drawings are used to distinguish similar objects, not necessarily to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the present text.

[0037] It should be understood that the terms "comprising", "including", "containing", "involving", "having" and "characterized by" indicate the presence of the features, steps, operations, elements, components, items, kinds, and / or groups but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups.

[0038] An energy storage system is a system that can store and supply electrical energy, with functions such as smoothing transition, peak shaving, frequency and voltage regulation. With the rapid development of the new energy industry, energy storage systems have been widely applied, especially in the fields of solar and wind power generation, which can smooth the output of electrical energy and reduce the impact on the power grid and users caused by randomness, intermittency and volatility.

[0039] As a key component in the energy storage system, the high-voltage box plays a bridge role connecting the battery cluster and the energy storage converter. It is the management unit of the high-voltage power circuit of the battery cluster, not only responsible for the transmission of electrical energy between the battery cluster and the energy storage converter, but also undertakes the important functions of collecting the voltage and current of the battery cluster, and controlling and protecting the battery cluster circuit.

[0040] The design of the high-voltage box fully considers the safety and stability requirements of the energy storage system. It adopts advanced electrical connection technology to ensure efficient and stable connection between the battery cluster and the energy storage converter, while reducing energy loss. In addition, the high-voltage box also has high-precision collection function, which can monitor the voltage and current state of the battery cluster in real time, providing accurate operation data for the system.

[0041] In terms of control and protection, the high-voltage box can accurately control the charging and discharging process of the battery cluster according to the actual needs of the system, realizing the optimal utilization of energy. The high-voltage box also integrates various safety protection functions, such as overvoltage protection, overcurrent protection, short circuit protection, etc., to ensure the safe and stable operation of the battery cluster circuit. These protection measures can effectively prevent system damage or safety accidents caused by electrical faults, improving the overall reliability of the energy storage system.

[0042] With the rapid development of the new energy industry, the performance requirements of the energy storage system for the high-voltage box are also increasing. In the future, the design of the high-voltage box will pay more attention to efficiency, safety, and intelligence, etc., to meet the application requirements of the energy storage system in larger scale and more complex scenarios.

[0043] Fig. 1 is a structural schematic diagram of a high-voltage box in the prior art. As shown in Fig. 1, the devices of the primary circuit of the high-voltage box include a circuit breaker 40, a main positive contactor 12, a main negative contactor 23, a pre-charging contactor 32, a pre-charging resistor 31, a positive fuse (i.e., a first fuse 11) and a negative fuse (i.e., a second fuse 21). The circuit breaker 40 is connected to the main positive circuit 10 and the main negative circuit 20 at the same time, and is used for electrical isolation, i.e., cutting off or connecting the load circuit and cutting off the fault circuit, to prevent the expansion of the accident and ensure safe operation. The main positive contactor 12 and the positive fuse are connected in series in the main positive circuit 10, the main negative contactor 23 and the negative fuse are connected in series in the main negative circuit 20, and the pre-charging contactor 32 and the pre-charging resistor 31 are connected in series and then connected in parallel across the main positive contactor 12. The main positive contactor 12 and the main negative contactor 23 are used to control the on-off of the primary circuit, i.e., in combination with the battery management system (BMS), actively performing overcharge, overheat and overdischarge protection; the pre-charging contactor 32 is used to control the on-off of the pre-charging circuit 30; and the positive fuse and the negative fuse are used for short-circuit protection.

[0044] The high-voltage box in the prior art has the following problems.

[0045] Firstly, the large number of components directly leads to the increase of the cost of the high-voltage box. The manufacturing, procurement and installation of each component require additional costs, which challenges the economy of the entire high-voltage box.

[0046] Secondly, the large number of components occupies a large installation space. In application scenarios with high requirements for the area of the container, the size and weight of the high-voltage box become key factors restricting the performance improvement of the high-voltage box. The excessively large high-voltage box not only increases the overall weight of the container, but also wastes the space utilization of the container.

[0047] In addition, due to the structural characteristics of the contactor, the contactor is prone to sticking when a short-circuit current or a large instantaneous current occurs in the circuit or there is a load cut-off, which produces an operation risk and has a high replacement cost. At the same time, the complex connection of multiple components also increases the failure rate and maintenance difficulty of the system. The failure of any component can affect the normal operation of the entire high-voltage box and even the entire energy storage system, which increases the instability and maintenance cost of the system.

[0048] In view of the above problems, the present application provides a high-voltage box, an energy storage battery cluster electrical control system and method. A fusion switch 50 is arranged in the high-voltage box to replace part of the components in the traditional high-voltage box, so as to reduce the number of components in the high-voltage box, and to achieve the effects of reducing the cost, simplifying the circuit structure and reducing the installation space.

[0049] The technical solutions of the present application are described in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes may not be described in detail in some examples.

[0050] Figure 2 is a schematic diagram of the structure of a high-voltage box according to an embodiment of the present application. As shown in Figure 2, the high-voltage box includes a main positive loop 10, a main negative loop 20, and a pre-charge loop 30. Among them, the main positive loop 10 represents the line from the battery positive (BAT+) to the direct current positive direction (DC+), the main negative loop 20 represents the line from the battery negative (BAT-) to the direct current negative direction (DC-), and the pre-charge loop 30 represents the line from point A to point B through the pre-charge resistor 31 and the third contact 53.

[0051] The high-voltage box includes a pre-charge resistor 31 and a fuse switch 50; the fuse switch 50 is provided with a first contact 51, a second contact 52, a third contact 53, and a fourth contact 54.

[0052] The first contact 51 is connected to the main positive loop 10, and the second contact 52 and the fourth contact 54 are connected in parallel to the main negative loop 20. The pre-charge resistor 31 and the third contact 53 are connected in series in the pre-charge loop 30, and the pre-charge loop 30 is connected in parallel across the first contact 51. The first contact 51 is linked with the second contact 52, and the third contact 53 is linked with the fourth contact 54.

[0053] Among them, the main role of the pre-charge resistor 31 is to limit the flow of current when the circuit is started, to protect the circuit elements and equipment. Specifically, it includes: limiting the large current impact during startup, limiting the charging speed of the capacitor in the circuit, making the voltage rise more stable, avoiding the damage of the circuit elements caused by the too fast voltage rise, prolonging the service life of the circuit, and improving the stability and reliability of the circuit.

[0054] Through the pre-charge loop 30, the voltage of multiple battery clusters can be adjusted, effectively reducing the circulating current between the battery clusters.

[0055] Continuing to refer to Figure 2, the main positive loop 10 further has a first fuse 11 connected in series; and the main negative loop 20 further has a second fuse 21 connected in series.

[0056] The first fuse 11 and the second fuse 21 are electrical elements used to protect the circuit from overload and short circuit. When the current exceeds the rated value of the fuse, the fuse wire will melt, cutting off the circuit, thereby preventing the equipment or wires in the circuit from being damaged or catching fire. It is a passive protection.

[0057] The selection of the fuse can be determined according to the rated current, rated voltage, and rated power of the circuit to ensure that the circuit can be cut off in time in the case of overload or short circuit.

[0058] In some embodiments, the first contact 51, the second contact 52, the third contact 53, and the fourth contact 54 are all mechanical contacts.

[0059] A mechanical contact refers to a mechanical switch device used to control electrical signals. When a mechanical contact is subjected to force or pressure, it will produce an action of turning on or off the circuit, thereby controlling the operation of electrical equipment. Mechanical contacts are usually made of metal materials and have high wear resistance and electrical conductivity, and are commonly used in various electrical equipment and circuits.

[0060] In some embodiments, the main negative circuit 20 is also connected in series with a shunt 22.

[0061] The shunt 22 is used to shunt the current in the circuit to the output of the shunt 22 according to a certain proportion, so as to measure, monitor, protect and control the current in the circuit, thereby ensuring the normal operation and safety of the circuit. Specifically, the shunt 22 usually contains a resistor or other current sensor, through which the current in the circuit is shunted to the shunt 22, and the actual current information in the circuit is obtained by measuring the current value at the output of the shunt 22. By connecting the shunt 22, the current change in the circuit can be monitored in real time, so that abnormal conditions (such as overload, short circuit, etc.) in the circuit can be found in time and appropriate measures can be taken for protection, or the running state of other devices or systems can be controlled according to the current value.

[0062] FIG. 3 is a structural schematic diagram of another high-voltage box provided by an embodiment of the present application. As shown in FIG. 3, the main negative circuit 20 is also connected in series with a Hall sensor 24.

[0063] The Hall sensor 24 is used to replace the shunt 22, which can be used to detect the current and determine the size and direction of the current by measuring the magnetic field generated by the current, which plays an important role in power systems and electronic devices.

[0064] In the embodiments of the present application, the high-voltage box uses the fusion switch 50 to replace the four components of the main positive contactor 12, the main negative contactor 23, the pre-charging contactor 32 and the circuit breaker 40 in the traditional high-voltage box, thereby reducing the number of components, combining the functions of the main positive contactor 12 and the main negative contactor 23, the pre-charging function of the pre-charging contactor 32, and the passive protection circuit function of the circuit breaker 40, while avoiding the problems of insufficient contactor current resistance, sticking and resin sealing aging, eliminating the shortcomings of the contactor, reducing the operation and maintenance workload, and improving the safety of the system.

[0065] In addition, due to the integration of the functions of the components, the internal space and wiring of the high-voltage box are saved, for example, the main wiring from the original circuit breaker 40 to the contactor is saved, the secondary wiring of the contactor is simplified, the internal space requirement of the high-voltage box is reduced, the volume of the high-voltage box is reduced, the installation is simpler, the wiring efficiency and maintenance efficiency are improved, and the production and maintenance costs are reduced.

[0066] In the embodiments of the present application, due to the setting of the fusion switch 50, the high-voltage box can operate the battery control circuit with load, the circuit can work normally under 2C current, more than 10000 times of on-off operation can be performed without load, 1000 times of on-off operation can be performed under 1C current, and the system short-circuit current tolerance can be improved from 12.6kA / 2ms to 15kA / 0.1s.

[0067] The fusion switch 50 is a DC-PV2 switch, and since the DC-PV2 switch has no polarity, it allows bidirectional current to pass through.

[0068] The fusion switch 50 does not require additional control or protection circuit to handle the load operation of the switch when used in the high-voltage box, and therefore the use of the high-voltage box of the present application can also simplify the design and operation of the BMS program.

[0069] The present application provides an energy storage battery cluster electrical control system, comprising: a battery cluster, a high-voltage box and an energy storage converter connected in sequence. The high-voltage box comprises a main positive circuit 10, a main negative circuit 20 and a pre-charging circuit 30, the high-voltage box comprises a pre-charging resistor 31 and a fusion switch 50, and the fusion switch 50 is provided with a first contact 51, a second contact 52, a third contact 53 and a fourth contact 54.

[0070] The first contact 51 is connected to the main positive circuit 10, and the second contact 52 and the fourth contact 54 are connected in parallel and then connected to the main negative circuit 20; the pre-charging resistor 31 and the third contact 53 are connected in series in the pre-charging circuit 30, and the pre-charging circuit 30 is connected in parallel across the first contact 51; the first contact 51 is linked with the second contact 52, and the third contact 53 is linked with the fourth contact 54.

[0071] In some embodiments, the main positive circuit 10 further has a first fuse 11 connected in series; and the main negative circuit 20 further has a second fuse 21 connected in series.

[0072] In some embodiments, the first contact 51, the second contact 52, the third contact 53 and the fourth contact 54 are all mechanical contacts.

[0073] Optionally, the main negative circuit 20 further has a shunt 22 connected in series.

[0074] Optionally, the main negative circuit 20 further has a Hall sensor 24 connected in series.

[0075] The energy storage battery cluster electrical control system provided by the embodiment is beneficial to improving the stability and reliability of the system, and is helpful to further development of new energy vehicles and energy storage technology.

[0076] The application also provides an energy storage battery cluster electrical control method, which is applied to the energy storage battery cluster electrical control system in the foregoing embodiments, takes the BMS as an execution subject, and comprises the following steps:

[0077] S1, determining a voltage difference between the highest voltage and the lowest voltage of the total voltage of the battery clusters.

[0078] In the embodiment, when the energy storage battery cluster electrical control system is normally working, after the BMS is powered on and self-checking is completed, the total voltage of each battery cluster is first detected, and the voltage difference between the highest voltage and the lowest voltage of the total voltage of the battery clusters is determined.

[0079] S2, when the voltage difference is less than or equal to the first preset threshold, the first contact 51 and the second contact 52 are closed.

[0080] Specifically, when the voltage difference is less than or equal to the first preset threshold, it indicates that the voltages between the battery clusters are relatively balanced, and when normal charging and discharging is started, the overall working voltage of the battery clusters will not fluctuate greatly, and at this time, the first contact 51 and the second contact 52 can be closed.

[0081] After the first contact 51 and the second contact 52 are closed, the BMS can send a normal charging and discharging signal to a power conversion system (PCS) through communication. The PCS controller can protectively charge and discharge the battery by acquiring the battery pack state information and the signal sent by the BMS, and ensure the safety of the battery operation.

[0082] In some embodiments, when the voltage difference is greater than the first preset threshold and less than a second preset threshold, the first contact 51 and the second contact 52 are disconnected, the third contact 53 and the fourth contact 54 are closed, until the voltage difference is less than or equal to the first preset threshold, the first contact 51 and the second contact 52 are closed, and the third contact 53 and the fourth contact 54 are disconnected after a preset time length.

[0083] Specifically, when the voltage difference is greater than the first preset threshold and less than the second preset threshold, it indicates that the voltages between the battery clusters are relatively unbalanced, and when normal charging and discharging is started, the overall working voltage of the battery clusters is prone to fluctuate greatly. The first contact 51 and the second contact 52 are disconnected, the third contact 53 and the fourth contact 54 are closed, and the inter-cluster pre-charging mode is started to help balance the battery cluster voltage and ensure that the overall work of the battery pack is more stable. When the voltage difference is less than or equal to the first preset threshold, it indicates that the pre-charging is completed.

[0084] After the pre-charging is completed, the first contact 51 and the second contact 52 are closed, and the third contact 53 and the fourth contact 54 are disconnected after a preset time length. The preset time length is set to avoid the simultaneous disconnection of the first contact 51, the second contact 52, the third contact 53 and the fourth contact 54, which may cause the circuit to be disconnected.

[0085] Optionally, if the pressure difference is greater than or equal to the second preset threshold, it is considered that the circuit has a fault, and human intervention is required to troubleshoot the fault.

[0086] In some embodiments, after the third contact 53 and the fourth contact 54 are closed, the third contact 53 and the fourth contact 54 can also be disconnected when it is determined that the pre-charging fails.

[0087] For example, when the circuit has a fault, the pre-charging fails, and the third contact 53 and the fourth contact 54 need to be disconnected to stop the pre-charging. After troubleshooting, the pre-charging needs to be performed again.

[0088] In some embodiments, after the first contact 51 and the second contact 52 are closed, the first contact 51 and the second contact 52 can also be disconnected when it is determined that the energy storage battery cluster electrical control system has a fault.

[0089] That is, during the normal charging and discharging process, if a fault occurs in the energy storage battery cluster electrical control system, the first contact 51 and the second contact 52 need to be disconnected to stop the charging and discharging. After troubleshooting, the first contact 51 and the second contact 52 are closed again for normal charging and discharging.

[0090] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high voltage box, characterized in that: The high-voltage box includes: a main positive circuit, a main negative circuit and a pre-charge circuit, and the high-voltage box includes a pre-charge resistor and a fusion switch; The fusion switch is provided with a first contact, a second contact, a third contact and a fourth contact; The first contact is connected to the main positive circuit, and the second contact and the fourth contact are connected in parallel and connected to the main negative circuit; The pre-charging resistor and the third contact are connected in series in the pre-charging circuit, and the pre-charging circuit is connected in parallel to both ends of the first contact; The first contact is linked to the second contact, and the third contact is linked to the fourth contact.

2. The high voltage box according to claim 1, characterized in that The main positive circuit is further connected in series with a first fuse; the main negative circuit is further connected in series with a second fuse.

3. The high voltage box according to claim 1, characterized in that The first contact, the second contact, the third contact, and the fourth contact are all mechanical contacts.

4. The high voltage box according to any one of claims 1 to 3, characterized in that: The main negative circuit is further connected in series with a shunt.

5. The high voltage box according to any one of claims 1 to 3, characterized in that: The main negative circuit is further connected in series with a Hall sensor.

6. An electrical control system for an energy storage battery cluster, characterized in that: The system includes: a battery cluster, a high-voltage box and an energy storage converter connected in sequence, the high-voltage box includes a main positive circuit, a main negative circuit and a pre-charge circuit, and the high-voltage box includes a pre-charge resistor and a fusion switch; The fusion switch is provided with a first contact, a second contact, a third contact and a fourth contact; The first contact is connected to the main positive circuit, and the second contact and the fourth contact are connected in parallel and connected to the main negative circuit; The pre-charging resistor and the third contact are connected in series in the pre-charging circuit, and the pre-charging circuit is connected in parallel to both ends of the first contact; The first contact is linked to the second contact, and the third contact is linked to the fourth contact.

7. An electrical control method for an energy storage battery cluster, characterized in that: The method is applied to the energy storage battery cluster electrical control system according to claim 6, and the method comprises: Determine the voltage difference between the highest voltage and the lowest voltage of the total voltage of the battery cluster; When the pressure difference is less than or equal to a first preset threshold, the first contact and the second contact are closed.

8. The method according to claim 7, characterized in that The method further comprises: When the pressure difference is greater than the first preset threshold and less than the second preset threshold, the first contact and the second contact are disconnected, and the third contact and the fourth contact are closed. When the pressure difference is less than or equal to the first preset threshold, the first contact and the second contact are closed, and the third contact and the fourth contact are disconnected after a preset time.

9. The method according to claim 8, characterized in that After the third contact and the fourth contact are closed, the method further includes: When it is determined that the pre-charging fails, the third contact and the fourth contact are disconnected.

10. The method according to claim 7, characterized in that After the first contact and the second contact are closed, the method further comprises: When it is determined that the electrical control system of the energy storage battery cluster fails, the first contact and the second contact are disconnected.

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