Battery energy storage management system and method

Abstract

The invention discloses a battery energy storage management system and method.According to the battery energy storage management system provided by the invention, an electric operation type circuit breaker is configured for each battery cluster, and battery operation data of the battery clusters are combined, so that the over-discharge cut-off function of batteries is realized; therefore, the problem of battery over-discharge damage caused by parasitic power consumption of the BMS in the traditional technology can be avoided; meanwhile, the voltage of the mains supply is collected through the battery management unit, self-starting is carried out based on voltage data, and a power supply main loop and an electrically operated circuit breaker are automatically connected in combination with battery operation data of the battery cluster, so that the battery cluster is connected with the UPS host and / or the direct current screen, and on this basis, after the system returns to normal, the UPS host and / or the direct current screen can be automatically switched on. The function of automatically charging the battery is realized; therefore, the problems of parasitic power consumption of the BMS and battery charging recovery through human intervention after the fault is solved are solved, so that the method is very suitable for large-scale application and popularization.

Description

Technical Field

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

[0002] Clean and efficient energy technology is necessary for the sustainable development of society. As an energy storage device, lithium-ion batteries have the advantages of high energy conversion efficiency, low self-discharge rate and long cycle life. Therefore, they have been widely used in the field of consumer electronics and are rapidly moving towards important application areas such as power tools, electronic transportation vehicles and reserve power sources. Based on this, further developing battery energy storage technology has very important economic value for the development of lithium batteries.

[0003] At present, the BMS system (Battery Management System) is often used to manage batteries. The core functions of the BMS include protecting the battery from exceeding its safe operating range, real-time monitoring of the battery's voltage, temperature and current, generating and reporting relevant data, controlling the battery's working environment and ensuring the battery's balance, etc. By performing these functions, it ensures the safe, stable and efficient operation of the battery system. However, the existing BMS system has the following deficiencies: (1) After the lithium battery is discharged, the BMS will still consume parasitic power, which will cause serious over-discharge damage to the lithium battery; (2) After the BMS issues a fault alarm and disconnects the main power supply circuit, the BMS is in a locked state. Therefore, when the AC power returns to normal and charging is possible, human intervention is required to resume normal charging. Therefore, based on the aforementioned deficiencies, how to provide a battery energy storage management system that can avoid battery over-discharge and automatically resume battery charging when the AC power returns to normal has become an urgent problem to be solved. Summary of the invention

[0004] The purpose of the present invention is to provide a battery energy storage management system and method to solve the problem of parasitic power consumption of BMS in the prior art, thereby causing battery over-discharge damage, and the problem of being unable to resume normal charging after the mains power is restored.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, a battery energy storage management system is provided, comprising a plurality of battery stacks, each battery stack comprising a plurality of battery cabinets, any battery cabinet being provided with a plurality of battery modules connected in series, any battery module comprising a plurality of single cells, and further comprising:

[0007] Electrically operated circuit breakers, wherein each battery cabinet is equipped with an electrically operated circuit breaker;

[0008] A plurality of battery modules connected in series in any battery cabinet form a battery cluster, the positive electrode of the battery cluster is electrically connected to the first input terminal of the power conversion unit through the electric circuit breaker in the battery cabinet, the negative electrode of the battery cluster is electrically connected to the second input terminal of the power conversion unit, and the battery cluster is electrically connected to the UPS host and / or the DC panel through the main power supply circuit;

[0009] A battery management unit, each battery cabinet is respectively equipped with a battery management unit, the power conversion unit in each battery cabinet is electrically connected to the corresponding battery management unit, and each battery management unit is also electrically connected to the mains power supply of the corresponding battery cabinet;

[0010] Each battery management unit is used to collect single cell information and battery module information in the corresponding battery cabinet, wherein each battery management unit is used to determine whether the corresponding battery cabinet is in an over-discharge state according to the single cell information and battery module information of the corresponding battery cabinet, and when it is determined to be in an over-discharge state, control the electric-operated circuit breaker in the corresponding battery cabinet to disconnect, so as to cut off the over-discharge of each battery module in the corresponding battery cabinet, and when any battery cabinet is in an over-discharge state, the main power supply circuit in any battery cabinet is in a disconnected state;

[0011] Each battery management unit is also used to collect the voltage data of the AC power supply of the corresponding battery cabinet after the main power supply circuit of the corresponding battery cabinet is disconnected, and to self-start based on the voltage data of the corresponding battery cabinet, so as to control the connection of the main power supply circuit and the electric circuit breaker in the corresponding battery cabinet according to the single cell information and battery module information of the corresponding battery cabinet after self-starting, so as to restore the charging of each battery module in the corresponding battery cabinet.

[0012] Based on the above disclosed content, the battery energy storage management system provided by the present invention is provided with an electric circuit breaker in each battery cabinet, wherein the electric circuit breaker in any battery cabinet is arranged between the positive electrode of the battery cluster in the cabinet and the first input terminal of the power conversion unit; in this way, the over-discharge of the battery can be cut off by detecting the operating data of the battery in each battery cabinet and combining the electric circuit breaker; that is, the battery management unit in each battery cabinet collects the single battery information and battery module information in the corresponding cabinet, and then judges whether the corresponding battery cabinet is in an over-discharge state based on the above-mentioned collected information, and when it is judged that it is in an over-discharge state, controls the electric circuit breaker in the corresponding battery cabinet to be disconnected, and when each battery cabinet is in an over-discharge state, its internal power supply main circuit is also in a disconnected state; based on this, cutting off the electric circuit breaker is equivalent to cutting off the connection between the battery cluster in the cabinet and the power management unit, and at the same time, the power supply main circuit of the battery cluster is also in a disconnected state, so that the discharge path of the battery cluster is completely cut off, thereby solving its over-discharge problem.

[0013] Furthermore, each battery management unit in the present application can also collect voltage data of the AC power supply of the corresponding battery cabinet, and then self-start according to the collected voltage data. That is to say, when the AC power is restored, the battery management unit of each battery cabinet self-starts to realize the battery management function; and after self-starting, each battery management unit controls the main power supply circuit and the electric circuit breaker in the corresponding battery cabinet according to the single cell information and battery module information of the corresponding battery cabinet, thereby connecting the UPS to the battery cluster and then restoring the charging of the battery in the cabinet; in this way, the function of automatic battery charging can be realized after the AC power returns to normal.

[0014] Through the above design, the battery energy storage management system provided by the present invention realizes the over-discharge cut-off function of the battery by configuring an electrically operated circuit breaker for each battery cluster and combining the battery operation data of the battery cluster; in this way, the parasitic power consumption of the BMS in the traditional technology, which may cause the battery to be damaged by over-discharge, can be avoided; at the same time, the voltage of the AC power supply is collected by the battery management unit to perform self-starting based on the voltage data, and the battery operation data of the battery cluster is combined to automatically connect the main power supply circuit and the electrically operated circuit breaker, so that the battery cluster is connected to the UPS host and / or the DC panel, based on which, the function of automatic battery charging can be realized after the system returns to normal; thus, the present invention solves the problem of parasitic power consumption of the BMS and the need for human intervention to restore battery charging after the fault is resolved, and is therefore very suitable for large-scale application and promotion.

[0015] In a possible design, the single cell information of any battery cabinet includes the single cell voltage, and the battery module information of any battery cabinet includes the total module voltage;

[0016] Each battery management unit is used to determine whether the single cell voltage of the corresponding battery cabinet is lower than the single cell voltage level 3 alarm threshold according to the single cell voltage of the corresponding battery cabinet, or to determine whether the total module voltage of the corresponding battery cabinet is lower than the total voltage level 3 alarm threshold according to the total module voltage of the corresponding battery cabinet;

[0017] If yes, each battery management unit is used to trigger the single cell undervoltage level 3 alarm or the overall undervoltage level 3 alarm of the corresponding battery cabinet, wherein when any battery cabinet is in the single cell undervoltage level 3 alarm or the overall undervoltage level 3 alarm, the battery management unit corresponding to any battery cabinet cuts off the main power supply circuit in the cabinet;

[0018] Each battery management unit is also used to continue to collect the single cell voltage and the total module voltage of the corresponding battery cabinet after triggering the single cell undervoltage level 3 alarm or the overall undervoltage level 3 alarm of the corresponding battery cabinet, and when it is judged that the single cell voltage that continues to be collected is lower than the first over-discharge threshold, or the total module voltage that continues to be collected is lower than the second over-discharge threshold, control the electric circuit breaker in the corresponding battery cabinet to disconnect, so as to cut off the over-discharge of each battery module in the corresponding battery cabinet.

[0019] In one possible design, any battery management unit is used to determine whether the mains power supply of the corresponding battery cabinet has been restored based on the voltage data of the mains power supply of the corresponding battery cabinet;

[0020] If so, any of the battery management units starts itself up to release the locked state, and after releasing the locked state, determines whether the corresponding battery cabinet has only a single cell undervoltage level 3 alarm fault or an overall undervoltage level 3 alarm fault according to the single cell information and battery module information of the corresponding battery cabinet;

[0021] If so, any of the battery management units is used to control the main power supply circuit and the electric circuit breaker in the corresponding battery cabinet to be connected, so as to restore the charging of each battery module in the corresponding battery cabinet.

[0022] In a possible design, any of the battery management units, after controlling the power supply main circuit and the electric-operated circuit breaker in the corresponding battery cabinet to be turned on, is also used to continuously collect voltage data of the AC power supply of the corresponding battery cabinet, so as to determine whether the AC power supply of the corresponding battery cabinet continues to supply power based on the continuously collected voltage data;

[0023] If yes, any of the battery management units is used to collect the cell voltage of each single battery in the corresponding battery cabinet again after each battery module in the corresponding battery cabinet is charged for a first preset time to obtain each charged cell voltage;

[0024] Any of the battery management units is further used to determine whether the voltage of any charged single cell is less than a first over-discharge threshold;

[0025] If so, any of the battery management units is used to execute the shutdown command after delaying for a second preset time period.

[0026] In a possible design, the battery management unit corresponding to any battery cabinet includes: a slave control module, a master control module and a display control module;

[0027] Wherein, each battery module in any battery cabinet corresponds to a slave control module, each slave control module is electrically connected to the master control module, and is used to collect single cell information and battery module information of the corresponding battery module, and send the collected single cell information and battery module information to the master control module;

[0028] A display control module, electrically connected to an energy storage AC device, the energy storage AC device is electrically connected to the mains power supply of any battery cabinet, wherein the display control module is used to perform voltage sampling on the energy storage AC device, obtain voltage data of the mains power supply of any battery cabinet, and send the voltage data of the mains power supply of any battery cabinet to the main control module;

[0029] A master control module, configured to determine whether any of the battery cabinets is in an over-discharge state based on the single cell information and battery module information transmitted by each slave control module, and when it is determined to be in an over-discharge state, control the electric circuit breaker in any of the battery cabinets to disconnect, so as to cut off the over-discharge of each battery module in the corresponding battery cabinet; and

[0030] Used to perform self-starting based on the voltage data of the AC power supply of any battery cabinet, and after self-starting, control the power supply main circuit and the electric-operated circuit breaker in any battery cabinet to be turned on according to the single battery information and battery module information of any battery cabinet, so as to resume charging of each battery module in any battery cabinet;

[0031] The display control module is also used to visualize the voltage data of the AC power supply of any battery cabinet, as well as the single cell information and battery module information transmitted by each slave control module.

[0032] In a possible design, the single cell information of any battery cabinet also includes: battery charging single cell temperature, battery discharging single cell temperature, battery charge state, charging current, discharging current and insulation resistance, and the battery module information of any battery cabinet also includes single cell voltage difference, single cell temperature difference, battery module voltage extreme difference and battery module temperature extreme difference;

[0033] Among them, the battery management unit of any battery cabinet is also used to issue alarm prompts for different faults when each data in the single cell information and battery module information of any battery cabinet reaches the corresponding alarm trigger threshold, and the alarm prompts are divided into three levels.

[0034] In a possible design, the battery management unit of any battery cabinet is also used to execute a system fault response action based on the fault type corresponding to the alarm prompt after issuing an alarm prompt for different faults.

[0035] In a possible design, any battery management unit is also used to perform external fault signal detection, in-cabinet communication fault detection, single cell voltage harness collection fault detection, single cell voltage chip fault detection, high-voltage line circuit breaker fault detection, high-voltage box contactor fault detection, main control power supply voltage abnormality detection, charging balancing board fault detection, power conversion unit fault detection and in-cabinet fire detection, and issue an alarm prompt when any fault is detected.

[0036] In a possible design, the power conversion unit includes a DC / DC unit, and a plurality of contactors are provided in the main power supply circuit in any battery cabinet;

[0037] Among them, the battery cluster in each battery cabinet is electrically connected to the corresponding battery management unit through the DC / DC unit, and the battery management unit is also electrically connected to the AC power supply through the AD / DC unit. The battery management unit corresponding to any battery cabinet controls several contactors to connect or disconnect the main power supply circuit in any battery cabinet.

[0038] In a second aspect, a battery energy storage management method of the battery energy storage management system based on the first aspect of the embodiment or any possible design of the first aspect is provided, wherein the method comprises:

[0039] The battery management unit in each battery cabinet collects the single cell information and battery module information in the corresponding battery cabinet, and collects the voltage data of the AC power supply of the corresponding battery cabinet after the main power supply circuit of the corresponding battery cabinet is disconnected;

[0040] Each battery management unit determines whether the corresponding battery cabinet is in an over-discharge state according to the single battery information and battery module information of the corresponding battery cabinet, and when it is determined to be in an over-discharge state, controls the electric circuit breaker in the corresponding battery cabinet to disconnect, so as to cut off the over-discharge of each battery module in the corresponding battery cabinet, wherein, when any battery cabinet is in an over-discharge state, the main power supply circuit in the battery cabinet is in a disconnected state;

[0041] Each battery management unit self-starts based on the voltage data of the corresponding battery cabinet, and after self-starting, controls the main power supply circuit and the electric circuit breaker in the corresponding battery cabinet to be connected according to the single cell information and battery module information of the corresponding battery cabinet, so as to restore the charging of each battery module in the corresponding battery cabinet.

[0042] Beneficial effects:

[0043] (1) The battery energy storage management system provided by the present invention realizes the over-discharge cut-off function of the battery by configuring an electrically operated circuit breaker for each battery cluster and combining the battery operation data of the battery cluster. In this way, the parasitic power consumption of the BMS in the traditional technology, which may cause the battery to be damaged by over-discharge, can be avoided. At the same time, the voltage of the AC power supply is collected by the battery management unit to perform self-starting based on the voltage data, and the battery operation data of the battery cluster is combined to automatically connect the main power supply circuit and the electrically operated circuit breaker, so that the battery cluster is connected to the UPS host and / or DC panel. Based on this, the battery can be automatically charged after the system returns to normal. Therefore, the present invention solves the problem of parasitic power consumption of the BMS and the need for human intervention to restore battery charging after the fault is solved, and is very suitable for large-scale application and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the architecture of a battery energy storage management system provided by an embodiment of the present invention;

[0045] Figure 2 A system topology diagram of a battery cabinet provided in an embodiment of the present invention;

[0046] Figure 3 A flowchart of the steps of a battery energy storage management method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0048] It should be understood that although the terms first, second, etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another unit. For example, a first unit can be referred to as a second unit, and similarly, a second unit can be referred to as a first unit without departing from the scope of the exemplary embodiments of the present invention.

[0049] It should be understood that the term "and / or" that may appear in this article is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" that may appear in this article describes another type of association object relationship, indicating that two relationships may exist. For example, A / and B can represent two situations: A exists alone, and A and B exist alone. In addition, the character " / " that may appear in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0050] Example:

[0051] See also Figure 1 and Figure 2 As shown, the battery energy storage management system provided in this embodiment may include but is not limited to: a plurality of battery stacks, wherein each battery stack includes a plurality of battery cabinets, and any battery cabinet is provided with a plurality of battery modules connected in series (that is, the battery modules in a battery cabinet are connected in series to form a battery cluster), and any battery module includes a plurality of single cells; in this way, a battery energy storage system can be formed through the above three-level topology structure.

[0052] In specific applications, the battery energy storage management system may also include, but is not limited to: an electric circuit breaker, a power conversion unit, and a battery management unit; wherein, in this embodiment, an electric circuit breaker is configured in the battery cabinet, and any battery cabinet is taken as an example to illustrate the connection structure of the electric circuit breaker, that is:

[0053] A plurality of battery modules connected in series in any battery cabinet form a battery cluster, the positive electrode of the battery cluster is electrically connected to the first input terminal of the power conversion unit through the electrically operated circuit breaker in the battery cabinet, the negative electrode of the battery cluster is electrically connected to the second input terminal of the power conversion unit, and the battery cluster is electrically connected to the UPS host and / or the DC panel through the main power supply circuit; wherein the DC panel is a new type of DC system with digital control, protection, management and measurement, which is equivalent to an energy storage device and an important part of the power supply system. It is mainly responsible for distributing electrical energy to each subsidiary circuit and providing fuses or circuit breakers for protection of each circuit in the system.

[0054] Similarly, each battery cabinet is also equipped with a battery management unit, wherein the power conversion unit in each battery cabinet is electrically connected to the corresponding battery management unit, and each battery management unit is also electrically connected to the mains power supply of the corresponding battery cabinet; see Figure 2As shown, it is equivalent to providing the aforementioned electrically operated circuit breaker between the battery cluster of any battery cabinet and the circuit of the corresponding power conversion unit, and the power conversion unit is electrically connected to the battery management unit (to supply power to it); therefore, by controlling the switch of the aforementioned electrically operated circuit breaker, the over-discharge cutoff of the battery cluster in the battery cabinet can be achieved.

[0055] Specifically, the over-discharge cut-off process of the battery cluster in each battery cabinet is as follows:

[0056] Each battery management unit is used to collect the single cell information and battery module information in the corresponding battery cabinet, wherein each battery management unit is used to determine whether the corresponding battery cabinet is in an over-discharge state according to the single cell information and battery module information of the corresponding battery cabinet, and when it is determined to be in an over-discharge state, control the electric-operated circuit breaker in the corresponding battery cabinet to disconnect, so as to cut off the over-discharge of each battery module in the corresponding battery cabinet, and when any battery cabinet is in an over-discharge state, the power supply main circuit in any battery cabinet is in a disconnected state; in this embodiment, it is equivalent to detecting each battery cabinet by The battery management unit detects the over-discharge state of the corresponding battery cabinet based on the battery operation data of the corresponding battery cabinet, and combines the electric circuit breaker in the cabinet to cut off the over-discharge of the battery. That is, when the battery management unit detects that the corresponding battery cabinet is in an over-discharge state based on the battery operation data of the corresponding battery cabinet, the electric circuit breaker in the cabinet will be cut off, and at this time, the main power supply circuit in the cabinet is also in a disconnected state; based on this, cutting off the electric circuit breaker is equivalent to cutting off the connection between the battery cluster in the cabinet and the power management unit, and at the same time, the main power supply circuit is also in a disconnected state, so that the discharge path of the battery cluster is completely cut off, thereby solving the problem of over-discharge.

[0057] Furthermore, the energy storage system provided in this embodiment can also automatically charge the battery when the city power returns to normal and the system recovers; specifically, the implementation process is as follows:

[0058] Each battery management unit is also used to collect the voltage data of the AC power supply of the corresponding battery cabinet after the main power supply circuit of the corresponding battery cabinet is disconnected, and to self-start based on the voltage data of the corresponding battery cabinet, so as to control the connection of the main power supply circuit and the electric circuit breaker in the corresponding battery cabinet according to the single cell information and battery module information of the corresponding battery cabinet after self-starting, so as to restore the charging of each battery module in the corresponding battery cabinet.

[0059] See also Figure 2As shown, there are actually two power supply modes for the power management unit, namely, power supply by the battery cluster in the battery cabinet and power supply by the AC power supply. For example, the power conversion unit includes a DC-DC unit. Therefore, the battery cluster in each battery cabinet is electrically connected to the corresponding battery management unit through the DC / DC unit, and the battery management unit is also electrically connected to the AC power supply through the AD / DC unit. In this way, when the main power supply circuit of the battery energy storage management system is disconnected, it actually means that there is a fault in the battery cabinet. At this time, the system is in an offline state, that is, the AC power supply is disconnected. Based on this, when the AC power is restored, After the power supply is restored, the power management unit can collect the corresponding voltage data and then automatically start to release the locked state; at this time, it can determine whether the main power supply circuit can be connected by collecting the battery operation data in the cabinet (that is, the aforementioned body battery information and battery module information); among them, when the battery management unit controls the main power supply circuit and the electric circuit breaker in the corresponding battery cabinet to be connected, it is equivalent to connecting the UPS host and / or DC panel with the battery cluster. At this time, the battery cluster can be charged through the UPS host and / or DC panel, thereby realizing the automatic charging function of the battery when the system is restored.

[0060] Through the above design, this embodiment realizes the function of cutting off the over-discharge of the battery and the function of automatically charging the battery after the mains power is restored, thereby avoiding the problem of the battery being easily damaged by over-discharge due to the parasitic power consumption of the BMS in the traditional technology and the problem of requiring manual intervention to resume charging; therefore, it is very suitable for large-scale promotion and application.

[0061] In a possible design, this embodiment discloses the specific implementation process of over-discharge cutoff based on the single cell information and battery module information:

[0062] In this embodiment, the single cell battery information of any battery cabinet includes the single cell battery voltage (that is, the single cell battery voltage of each battery in the any battery cabinet), and the battery module information of any battery cabinet includes the total module voltage, which, of course, includes the total module voltage of all battery modules in the any battery cabinet; wherein the total module voltage of any battery module is obtained by summing up the single cell battery voltages of each battery in the any battery module.

[0063] In this way, this embodiment is equivalent to performing over-discharge cutoff of the battery according to the single cell voltage and the total module voltage, that is:

[0064] Each battery management unit is used to determine whether the single cell voltage of the corresponding battery cabinet is lower than the third-level alarm threshold of the single cell voltage according to the single cell voltage of the corresponding battery cabinet, or to determine whether the total module voltage of the corresponding battery cabinet is less than the third-level alarm threshold of the total voltage according to the total module voltage of the corresponding battery cabinet. In specific applications, it is only necessary to determine whether any single cell voltage is lower than the third-level alarm threshold of the single cell voltage, or whether any module total voltage is less than the third-level alarm threshold of the total voltage. Among them, as long as any of the above conditions is met, it means that the single cell voltage or the overall voltage in each battery cabinet is undervoltage. At this time, it indicates that the battery in the battery cabinet has a serious undervoltage fault. Therefore, a third-level alarm is required, that is, each battery management unit will trigger the single cell undervoltage third-level alarm or the overall undervoltage third-level alarm of the corresponding battery cabinet.

[0065] In specific applications, when any battery cabinet is in a single cell undervoltage level 3 alarm or an overall undervoltage level 3 alarm, the battery management unit corresponding to any battery cabinet will cut off the main power supply circuit in the cabinet (this action is triggered by executing the trip process, and the trip process is described in detail below) to ensure battery safety; at the same time, after triggering the single cell undervoltage level 3 alarm or the overall undervoltage level 3 alarm of the corresponding battery cabinet, each battery management unit will continue to collect the single cell voltage and the total module voltage of the corresponding battery cabinet, and when it is determined that the single cell voltage that continues to be collected is lower than the first over-discharge threshold, or the total module voltage that continues to be collected is lower than the second over-discharge threshold, the electric circuit breaker in the corresponding battery cabinet is controlled to be disconnected to cut off the over-discharge of each battery module in the corresponding battery cabinet.

[0066] Based on this, the above-mentioned over-discharge state detection is equivalent to meeting two conditions. The first condition is that the battery cabinet has triggered a single cell undervoltage level 3 alarm or an overall undervoltage level 3 alarm. The second condition is that, on the basis of the above-mentioned three-level alarm, the single cell voltage or the total module voltage continues to decrease until it decreases to less than the corresponding over-discharge threshold. In this case, it can be determined that the battery in the battery cabinet is in an over-discharge state. At this time, the electric circuit breaker in the battery cabinet can be controlled to disconnect, thereby cutting off all discharge paths of the battery cluster to achieve the function of battery over-discharge cutoff.

[0067] Optionally, for example, the aforementioned single cell voltage three-level alarm threshold can be but not limited to being set to 2.7V, and the overall voltage three-level alarm threshold can be but not limited to being set to N×M×2.8V; wherein N is the total number of battery modules, and M is a constant, usually taking a value of 15 or 16; similarly, the first over-discharge threshold can be but not limited to being set to 2.5V; of course, the aforementioned various thresholds can be but not limited to being specifically set according to actual use, and are not limited to the aforementioned examples.

[0068] Of course, in addition to the single cell voltage, the single cell information may also include but is not limited to: battery charging cell temperature, battery discharging cell temperature, battery charge state, charging current, discharging current and insulation resistance and other data; similarly, the battery module information may also include but is not limited to: single cell voltage difference (i.e., the voltage difference between each single cell in the module), single cell temperature difference (the temperature difference between each single cell in the module), battery module voltage extreme difference (the voltage difference between the positive and negative poles of the battery module) and battery module temperature extreme difference (the temperature difference between the positive and negative poles of the battery module) and other data; in this way, based on the aforementioned data, different faults can be detected, so that when the battery is automatically charged later, the charging decision can be completed based on the aforementioned data; the specific charging decision process is described in detail below.

[0069] Therefore, through the above explanation, the battery over-discharge cutoff can be achieved through the single cell voltage of the battery in the battery cabinet and the total module voltage, combined with the three-level alarm method, so as to achieve the purpose of preventing the battery from being damaged by over-discharge.

[0070] After the above-mentioned over-discharge cut-off process is described, the following discloses the implementation process of automatic battery charging, wherein any battery management unit is taken as an example for description:

[0071] In specific applications, any battery management unit is used to determine whether the AC power supply of the corresponding battery cabinet has been restored based on the voltage data of the AC power supply of the corresponding battery cabinet; that is, as mentioned above, the battery management unit is electrically connected to the AC power supply, so its voltage data can be collected in real time to determine whether the power supply has been restored; wherein, if the AC power supply is restored, any battery management unit will self-start to release the locked state.

[0072] In the present embodiment, it has been explained above that the battery management unit is electrically connected to the AC power supply through the AC / DC unit. Therefore, when the AC power supply is restored, it can be powered on and run; then, it can be judged whether the AC power is restored based on the collected voltage data; and after it is judged that the AC power is restored, it can be automatically started to release the locked state, thereby entering the working state and realizing the battery management function; at this time, it can be judged based on the single cell information and battery module information of the corresponding battery cabinet whether the corresponding battery cabinet only has a single cell undervoltage level 3 alarm fault or an overall undervoltage level 3 alarm fault, so as to make a decision and control on the automatic charging of the battery according to the judgment result.

[0073] In specific applications, it has been explained above that the single cell information and battery module information also include information such as charging temperature, discharging temperature, charge state, single cell voltage difference, etc. Therefore, different types of fault detection can be performed according to the above. In this way, when it is detected that in the battery cabinet corresponding to any battery management unit, only a single cell voltage is less than the single cell voltage level 3 alarm threshold, or the total module voltage is less than the total voltage level 3 alarm threshold, it can be determined that the battery cabinet only has a single cell undervoltage level 3 alarm fault or an overall undervoltage level 3 alarm fault.

[0074] At this time, any of the battery management units is used to control the main power supply circuit and the electric circuit breaker in the corresponding battery cabinet to be turned on to restore the charging of each battery module in the corresponding battery cabinet; wherein, see Figure 2 As shown, for example, a number of contactors (i.e. Figure 2 K1, K2, K3 and K4 in the battery cabinet, wherein K1 is the main positive contactor, K2 is the circulating (pre-charging) contactor, K4 is the main negative contactor, and K3 is the anti-reverse contactor). Therefore, the battery management unit corresponding to any battery cabinet can connect or disconnect the main power supply circuit in any battery cabinet by controlling a plurality of contactors. Based on this, when it is determined that the battery cabinet only has a single cell undervoltage level 3 alarm fault or an overall undervoltage level 3 alarm fault, the main power supply circuit can be turned on by closing the aforementioned plurality of contactors. Thus, it is equivalent to connecting the battery cluster in the battery cabinet with the UPS host and / or the DC screen. At this time, the battery cluster can be charged by the UPS host and / or the DC screen. Of course, in this embodiment, when the battery management unit receives a fault recovery instruction (i.e., the personnel manually clicks the fault recovery button), it will also enter the aforementioned main power supply recovery judgment, and the three-level alarm is only a single cell undervoltage or an overall undervoltage fault judgment, that is, it enters the automatic charging recovery process.

[0075] Furthermore, in this embodiment, a charging detection process is also provided to ensure that the battery has been charged normally; wherein the charging detection process is as follows:

[0076] Any of the battery management units, after controlling the main power supply circuit and the electrically operated circuit breaker in the corresponding battery cabinet to be connected, is also used to continuously collect the voltage data of the AC power supply of the corresponding battery cabinet, so as to determine whether the AC power supply of the corresponding battery cabinet continues to supply power based on the continuously collected voltage data; wherein, if it is detected that the AC power supply continues to supply power, at this time, any of the battery management units is used to collect the single cell voltage of each single cell in the corresponding battery cabinet again after each battery module in the corresponding battery cabinet is charged for a first preset time period (such as after charging for 15 minutes), so as to obtain each single cell voltage after charging.

[0077] Next, any of the battery management units is also used to determine whether the voltage of any single cell after charging is less than the first over-discharge threshold; if it is less than the first over-discharge threshold, it means that the battery has not been successfully charged. At this time, any of the battery management units is used to execute a jump command after a delay of a second preset time (such as a delay of 3s) to perform a fault power-off to ensure battery safety.

[0078] Optionally, an example of the action flow corresponding to the jump command (i.e., power off due to a fault) is shown in the following Table 1:

[0079] Table 1 shows the power-off process due to a fault.

[0080] Table 1

[0081]

[0082] Thus, through the above explanation, when the mains power is restored and only single cell undervoltage and overall undervoltage faults exist in the system, the batteries in each battery cabinet can be automatically charged.

[0083] In addition, in this embodiment, in order to reduce costs, the aforementioned electric-operated circuit breaker can be replaced with a shunt release, for example but not limited to; that is, in the case of over-discharge, the shunt release can be controlled to trip, thereby cutting off the over-discharge of the battery cluster in the battery cabinet; wherein, the use of the shunt release has a lower functional integrity than the aforementioned electric-operated circuit breaker, that is, during automatic charging, the shunt release cannot be automatically closed; however, whether the shunt release is closed does not affect the automatic charging of the battery in the battery cabinet, that is, through Figure 2 It can be seen that when the battery management unit is powered on and automatically starts, and the control power supply main circuit is connected, the charging circuit of the entire electromagnetic cluster is already connected, and the function of automatic battery charging can be completed, which only affects one power supply of the battery management unit; based on this, the electric circuit breaker is replaced by a shunt release, which can achieve the above functions while reducing costs; of course, when replaced with a shunt release, a prompt can be given after the main power supply circuit is connected, allowing maintenance personnel to manually close the shunt release.

[0084] In one possible design, one specific structure of the battery management unit is disclosed as follows:

[0085] See also Figure 1 and Figure 2 As shown, for example, the battery management unit corresponding to any battery cabinet may include but is not limited to: a slave control module, a master control module and a display control module; wherein the connection structure of the aforementioned modules is:

[0086] Each battery module in any of the battery cabinets corresponds to a slave control module, and each slave control module is electrically connected to the master control module for collecting single cell information and battery module information of the corresponding battery module, and sending the collected single cell information and battery module information to the master control module; and the display control module is electrically connected to the energy storage AC; in this embodiment, the energy storage AC is electrically connected to the AC power supply of any of the battery cabinets, so that the display control module is used to sample the voltage of the energy storage AC, obtain the voltage data of the AC power supply of any of the battery cabinets, and send the voltage data of the AC power supply of any of the battery cabinets to the master control module.

[0087] Based on this, the main control module is used to determine whether any of the battery cabinets is in an over-discharge state according to the single cell information and battery module information transmitted by each slave control module, and when it is determined to be in an over-discharge state, control the electric circuit breaker in any of the battery cabinets to be disconnected to cut off the over-discharge of each battery module in the corresponding battery cabinet; and is used to self-start based on the voltage data of the AC power supply of any of the battery cabinets, and after self-starting, control the main power supply circuit and the electric circuit breaker in any of the battery cabinets to be connected according to the single cell information and battery module information of any of the battery cabinets, so as to restore the charging of each battery module in any of the battery cabinets.

[0088] In this embodiment, see Figure 1 and Figure 2 As shown, when the AC power supply is restored, the main control module, the display control module and each slave control module are powered on and started automatically. At this time, the display control module collects the voltage data of the AC power supply and transmits it to the main control module. Based on the voltage data, the main control module can determine whether the AC power supply is restored. After determining that the power supply is restored, the locked state is released, and the slave control module is controlled to collect the single cell information and battery module information of the battery cabinet, and based on this, the main power supply circuit is connected and controlled, thereby realizing automatic charging of the battery.

[0089] Furthermore, for example, the display control module is also used to visualize the voltage data of the AC power supply of any battery cabinet, as well as the single cell information and battery module information transmitted by each slave control module; in this way, it is convenient for operation and maintenance personnel to view and understand the system operation status in a timely manner.

[0090] In addition, in specific applications, the entire battery management unit may not include a display control unit, and only implement the corresponding battery management functions through the main control module and the slave control module; among them, the settings of the main control and display control can be specifically set according to actual use and are not specifically limited here.

[0091] In a specific embodiment, since it has been explained above that the single cell information and battery module information of any battery cabinet contain different types of information, such as charging cell temperature, discharging cell temperature, charge state, charging current, etc. (the specific content has been explained above and will not be repeated here); therefore, the battery management unit of any battery cabinet is also used to issue alarm prompts for different faults when each data in the single cell information and battery module information of any battery cabinet reaches the corresponding alarm trigger threshold, and after issuing alarm prompts for different faults, it is also used to execute system fault response actions based on the fault type corresponding to the alarm prompt.

[0092] At the same time, for example, any battery management unit is also used to perform external fault signal detection, in-cabinet communication fault detection, single cell voltage harness collection fault detection, single cell voltage chip fault detection, high-voltage line circuit breaker fault detection, high-voltage box contactor fault detection, main control power supply voltage abnormality detection, charging balancing board fault detection, power conversion unit fault detection, as well as in-cabinet fire detection and power plug-in temperature detection, and issue an alarm prompt when any fault is detected.

[0093] In this embodiment, the alarm level of the alarm prompt is divided into three levels, namely, level 1 alarm, level 2 alarm and level 3 alarm; wherein, level 1 alarm is a minor fault, level 2 alarm is a moderate fault, and level 3 alarm is a serious fault.

[0094] Furthermore, the trigger thresholds and system fault response actions corresponding to the alarm levels of the aforementioned different fault types are disclosed below; the specific contents can be found in Table 2 below.

[0095] Table 2 is a list of master and slave faults.

[0096] Table 2

[0097]

[0098]

[0099]

[0100]

[0101]

[0102]

[0103]

[0104]

[0105] Of course, only some fault types are listed in the above Table 2, and the remaining fault types are no longer described one by one. The trigger thresholds, alarm levels and corresponding response actions of different faults can be specifically set according to actual use, and are not limited to the above examples.

[0106] Therefore, through the above detailed description of the battery energy storage management system, the present invention realizes the over-discharge cut-off function of the battery by configuring an electrically operated circuit breaker for each battery cluster and combining the battery operation data of the battery cluster; in this way, the parasitic power consumption of BMS in the traditional technology can be avoided, which may cause the problem of over-discharge damage to the battery; at the same time, the voltage of the AC power supply is collected by the battery management unit to self-start based on the voltage data, and the main power supply circuit and the electrically operated circuit breaker are automatically connected in combination with the battery operation data of the battery cluster, so that the charging circuit is turned on, based on which, the function of automatic battery charging can be realized after the system returns to normal; thus, the present invention solves the problem of parasitic power consumption of BMS and the need for human intervention to restore battery charging after the fault is resolved, and is therefore very suitable for large-scale application and promotion.

[0107] See also Figure 3 As shown, the second aspect of this embodiment provides a battery energy storage management method based on the battery energy storage management system described in the first aspect of the embodiment, and the method can be but is not limited to being executed by a battery management unit in the battery energy storage management system, and its specific operating steps can be but are not limited to being shown in the following steps S1 to S3.

[0108] S1. The battery management unit in each battery cabinet collects the single cell information and battery module information in the corresponding battery cabinet, and collects the voltage data of the AC power supply of the corresponding battery cabinet after the main power supply circuit of the corresponding battery cabinet is disconnected.

[0109] S2. Each battery management unit determines whether the corresponding battery cabinet is in an over-discharge state based on the single cell information and battery module information of the corresponding battery cabinet, and when it is determined to be in an over-discharge state, controls the electric circuit breaker in the corresponding battery cabinet to disconnect, so as to cut off the over-discharge of each battery module in the corresponding battery cabinet, wherein, when any battery cabinet is in an over-discharge state, the main power supply circuit in any battery cabinet is in a disconnected state.

[0110] S3. Each battery management unit starts itself up based on the voltage data of the corresponding battery cabinet, and after self-starting, controls the main power supply circuit and the electric circuit breaker in the corresponding battery cabinet to be turned on according to the single cell information and battery module information of the corresponding battery cabinet, so as to restore the charging of each battery module in the corresponding battery cabinet.

[0111] The working process, working details and technical effects of the method provided in this embodiment can be found in the first aspect of the embodiment and will not be described in detail here.

[0112] The third aspect of this embodiment provides an electronic device, comprising: a memory, a processor and a transceiver that are communicatively connected in sequence, wherein the memory is used to store a computer program, the transceiver is used to send and receive messages, and the processor is used to read the computer program to execute the battery energy storage management method as described in the second aspect of the embodiment.

[0113] For example, the memory may include, but is not limited to, random access memory (RAM), read-only memory (ROM), flash memory, first-in-first-out memory (FIFO) and / or first-in-last-out memory (FILO), etc. Specifically, the processor may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). At the same time, the processor may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state.

[0114] In some embodiments, the processor may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. For example, the processor may not be limited to a microprocessor of the STM32F105 series, a reduced instruction set computer (RISC) microprocessor, an X86 or other architecture processor, or a processor with an integrated embedded neural network processor (NPU); the transceiver may be, but is not limited to, a wireless fidelity (WIFI) wireless transceiver, a Bluetooth wireless transceiver, a general packet radio service technology (Genera l Packet Rad ioService, GPRS) wireless transceiver, a ZigBee protocol (a low-power LAN protocol based on the IEEE 802.15.4 standard, ZigBee) wireless transceiver, a 3G transceiver, a 4G transceiver and / or a 5G transceiver, etc. In addition, the device may also include, but is not limited to, a power module, a display screen and other necessary components.

[0115] The working process, working details and technical effects of the electronic device provided in this embodiment can be found in the first aspect of the embodiment and will not be described in detail here.

[0116] The fourth aspect of this embodiment provides a storage medium storing instructions including the battery energy storage management method described in the second aspect of the embodiment, that is, the storage medium stores instructions, and when the instructions are executed on a computer, the battery energy storage management method described in the second aspect of the embodiment is executed.

[0117] The storage medium refers to a carrier for storing data, which may include but is not limited to a floppy disk, a CD, a hard disk, a flash memory, a USB flash drive and / or a memory stick, etc. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.

[0118] The working process, working details and technical effects of the storage medium provided in this embodiment can be found in the first aspect of the embodiment and will not be described in detail here.

[0119] A fifth aspect of this embodiment provides a computer program product comprising instructions, which, when executed on a computer, causes the computer to execute the battery energy storage management method as described in the second aspect of the embodiment, wherein the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.

[0120] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery energy storage management system, comprising a plurality of battery stacks, each battery stack comprising a plurality of battery cabinets, any battery cabinet being provided with a plurality of battery modules connected in series, and any battery module comprising a plurality of single cells, characterized in that: Also includes: Electrically operated circuit breakers, wherein each battery cabinet is equipped with an electrically operated circuit breaker; A plurality of battery modules connected in series in any battery cabinet form a battery cluster, the positive electrode of the battery cluster is electrically connected to the first input terminal of the power conversion unit through the electric circuit breaker in the battery cabinet, the negative electrode of the battery cluster is electrically connected to the second input terminal of the power conversion unit, and the battery cluster is electrically connected to the UPS host and / or the DC panel through the main power supply circuit; A battery management unit, each battery cabinet is respectively equipped with a battery management unit, the power conversion unit in each battery cabinet is electrically connected to the corresponding battery management unit, and each battery management unit is also electrically connected to the mains power supply of the corresponding battery cabinet; Each battery management unit is used to collect single cell information and battery module information in the corresponding battery cabinet, wherein each battery management unit is used to determine whether the corresponding battery cabinet is in an over-discharge state according to the single cell information and battery module information of the corresponding battery cabinet, and when it is determined to be in an over-discharge state, control the electric-operated circuit breaker in the corresponding battery cabinet to disconnect, so as to cut off the over-discharge of each battery module in the corresponding battery cabinet, and when any battery cabinet is in an over-discharge state, the main power supply circuit in any battery cabinet is in a disconnected state; Each battery management unit is also used to collect the voltage data of the AC power supply of the corresponding battery cabinet after the main power supply circuit of the corresponding battery cabinet is disconnected, and to self-start based on the voltage data of the corresponding battery cabinet, so as to control the connection of the main power supply circuit and the electric circuit breaker in the corresponding battery cabinet according to the single cell information and battery module information of the corresponding battery cabinet after self-starting, so as to restore the charging of each battery module in the corresponding battery cabinet.

2. A battery energy storage management system according to claim 1, characterized in that: The single cell information of any battery cabinet includes the single cell voltage, and the battery module information of any battery cabinet includes the total module voltage; Each battery management unit is used to determine whether the single cell voltage of the corresponding battery cabinet is lower than the single cell voltage level 3 alarm threshold according to the single cell voltage of the corresponding battery cabinet, or to determine whether the total module voltage of the corresponding battery cabinet is lower than the total voltage level 3 alarm threshold according to the total module voltage of the corresponding battery cabinet; If yes, each battery management unit is used to trigger the single cell undervoltage level 3 alarm or the overall undervoltage level 3 alarm of the corresponding battery cabinet, wherein when any battery cabinet is in the single cell undervoltage level 3 alarm or the overall undervoltage level 3 alarm, the battery management unit corresponding to any battery cabinet cuts off the main power supply circuit in the cabinet; Each battery management unit is also used to continue to collect the single cell voltage and the total module voltage of the corresponding battery cabinet after triggering the single cell undervoltage level 3 alarm or the overall undervoltage level 3 alarm of the corresponding battery cabinet, and when it is judged that the single cell voltage that continues to be collected is lower than the first over-discharge threshold, or the total module voltage that continues to be collected is lower than the second over-discharge threshold, control the electric circuit breaker in the corresponding battery cabinet to disconnect, so as to cut off the over-discharge of each battery module in the corresponding battery cabinet.

3. A battery energy storage management system according to claim 1, characterized in that: Any battery management unit is used to determine whether the mains power supply of the corresponding battery cabinet has been restored based on the voltage data of the mains power supply of the corresponding battery cabinet; If so, any of the battery management units starts itself up to release the locked state, and after releasing the locked state, determines whether the corresponding battery cabinet has only a single cell undervoltage level 3 alarm fault or an overall undervoltage level 3 alarm fault according to the single cell information and battery module information of the corresponding battery cabinet; If so, any of the battery management units is used to control the main power supply circuit and the electric circuit breaker in the corresponding battery cabinet to be connected, so as to restore the charging of each battery module in the corresponding battery cabinet.

4. A battery energy storage management system according to claim 3, characterized in that: Any of the battery management units, after controlling the power supply main circuit and the electric-operated circuit breaker in the corresponding battery cabinet to be turned on, is also used to continuously collect voltage data of the mains power supply of the corresponding battery cabinet, so as to determine whether the mains power supply of the corresponding battery cabinet continues to supply power based on the continuously collected voltage data; If yes, any of the battery management units is used to collect the cell voltage of each single battery in the corresponding battery cabinet again after each battery module in the corresponding battery cabinet is charged for a first preset time to obtain each charged cell voltage; Any of the battery management units is further used to determine whether the voltage of any charged single cell is less than a first over-discharge threshold; If so, any of the battery management units is used to execute the shutdown command after delaying for a second preset time period.

5. A battery energy storage management system according to claim 1, characterized in that: The battery management unit corresponding to any battery cabinet includes: a slave control module, a master control module and a display control module; Wherein, each battery module in any battery cabinet corresponds to a slave control module, each slave control module is electrically connected to the master control module, and is used to collect single cell information and battery module information of the corresponding battery module, and send the collected single cell information and battery module information to the master control module; A display control module, electrically connected to an energy storage AC device, the energy storage AC device is electrically connected to the mains power supply of any battery cabinet, wherein the display control module is used to perform voltage sampling on the energy storage AC device, obtain voltage data of the mains power supply of any battery cabinet, and send the voltage data of the mains power supply of any battery cabinet to the main control module; A master control module, configured to determine whether any of the battery cabinets is in an over-discharge state based on the single cell information and battery module information transmitted by each slave control module, and when it is determined to be in an over-discharge state, control the electric circuit breaker in any of the battery cabinets to disconnect, so as to cut off the over-discharge of each battery module in the corresponding battery cabinet; and Used to perform self-starting based on the voltage data of the AC power supply of any battery cabinet, and after self-starting, control the power supply main circuit and the electric-operated circuit breaker in any battery cabinet to be turned on according to the single battery information and battery module information of any battery cabinet, so as to resume charging of each battery module in any battery cabinet; The display control module is also used to visualize the voltage data of the AC power supply of any battery cabinet, as well as the single cell information and battery module information transmitted by each slave control module.

6. A battery energy storage management system according to claim 1, characterized in that: The single cell information of any battery cabinet also includes: battery charging single cell temperature, battery discharging single cell temperature, battery charge state, charging current, discharging current and insulation resistance. The battery module information of any battery cabinet also includes single cell voltage difference, single cell temperature difference, battery module voltage extreme difference and battery module temperature extreme difference. Among them, the battery management unit of any battery cabinet is also used to issue alarm prompts for different faults when each data in the single cell information and battery module information of any battery cabinet reaches the corresponding alarm trigger threshold, and the alarm prompts are divided into three levels.

7. A battery energy storage management system according to claim 6, characterized in that: The battery management unit of any battery cabinet is further used to execute a system fault response action based on the fault type corresponding to the alarm prompt after issuing an alarm prompt for different faults.

8. A battery energy storage management system according to claim 1, characterized in that: Any battery management unit is also used to detect external fault signals, communication faults within the cabinet, single cell voltage harness collection faults, single cell voltage chip faults, high-voltage line circuit breaker faults, high-voltage box contactor faults, main control power supply voltage anomalies, charging balancing board faults, power conversion unit faults, and fires within the cabinet, and will issue an alarm when any fault is detected.

9. A battery energy storage management system according to claim 1, characterized in that: The power conversion unit includes a DC / DC unit, and a plurality of contactors are provided in the main power supply circuit in any battery cabinet; Among them, the battery cluster in each battery cabinet is electrically connected to the corresponding battery management unit through the DC / DC unit, and the battery management unit is also electrically connected to the AC power supply through the AD / DC unit. The battery management unit corresponding to any battery cabinet controls several contactors to connect or disconnect the main power supply circuit in any battery cabinet.

10. A battery energy storage management method based on the battery energy storage management system according to any one of claims 1 to 9, characterized in that: include: The battery management unit in each battery cabinet collects the single cell information and battery module information in the corresponding battery cabinet, and collects the voltage data of the AC power supply of the corresponding battery cabinet after the main power supply circuit of the corresponding battery cabinet is disconnected; Each battery management unit determines whether the corresponding battery cabinet is in an over-discharge state according to the single battery information and battery module information of the corresponding battery cabinet, and when it is determined to be in an over-discharge state, controls the electric circuit breaker in the corresponding battery cabinet to disconnect, so as to cut off the over-discharge of each battery module in the corresponding battery cabinet, wherein, when any battery cabinet is in an over-discharge state, the main power supply circuit in the battery cabinet is in a disconnected state; Each battery management unit self-starts based on the voltage data of the corresponding battery cabinet, and after self-starting, controls the main power supply circuit and the electric circuit breaker in the corresponding battery cabinet to be connected according to the single cell information and battery module information of the corresponding battery cabinet, so as to restore the charging of each battery module in the corresponding battery cabinet.

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