Energy storage battery cabinet and security self-starting method thereof

Abstract

The present application provides an energy storage battery cabinet and a security self-starting method thereof. In the method, when the energy storage battery cabinet has no mains input, the BMS is awakened periodically based on its own first uninterruptible power supply and detects the battery status after awakening. Then, if the BMS determines that the battery status meets a preset thermal runaway condition, the second uninterruptible power supply in the energy storage battery cabinet is awakened to power a security unit in the energy storage battery cabinet, thereby enabling the security unit to perform security work. That is, the present application can not only realize periodic detection of battery safety faults without external power supply, but also start the second uninterruptible power supply in a timely manner, thereby ensuring the function of the security unit, protecting the fire safety of the entire equipment, and reducing security risks.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to an energy storage battery cabinet and a security self-starting method thereof. Background Art

[0002] Energy storage systems in large power plants and other applications typically take the form of battery cabinets. To ensure safe application, these cabinets are often equipped with security features. However, these security features require the normal operation of the auxiliary power supply. This means they can only function properly after being installed at the project site and connected to the auxiliary power supply.

[0003] Therefore, when the auxiliary power supply is missing, such as an abnormal power outage in the power grid, or there is no auxiliary power supply during transportation, there will be a security blind spot. At this time, if there is a risk of fire or explosion in the energy storage battery cabinet, it will not be identified and controlled. Summary of the Invention

[0004] In view of this, the present application provides an energy storage battery cabinet and a security self-starting method thereof to reduce security risks and improve safety.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] The first aspect of the present application provides a security self-starting method for an energy storage battery cabinet, comprising:

[0007] When there is no mains power input to the energy storage battery cabinet, the battery management system BMS in the energy storage battery cabinet is awakened periodically based on its own first uninterruptible power supply, and detects the battery status after waking up;

[0008] The BMS determines whether the battery state meets a preset thermal runaway condition;

[0009] If the battery state meets the preset thermal runaway condition, the BMS wakes up the second uninterruptible power supply in the energy storage battery cabinet to supply power to the security unit in the energy storage battery cabinet;

[0010] The security unit performs security work.

[0011] Optionally, the battery management system BMS in the energy storage battery cabinet periodically wakes up based on its own first uninterruptible power supply and detects the battery status after waking up, including:

[0012] Each battery module management unit (BMU) in the BMS is periodically awakened based on its own first uninterruptible power supply;

[0013] After waking up, each BMU detects the cell voltage, temperature, and impedance of the corresponding battery module, and sends the detected data to the battery cluster management unit (CMU) in the BMS to form the battery status.

[0014] Optionally, the BMS determines whether the battery state meets a preset thermal runaway condition, including:

[0015] The CMU in the BMS determines whether the battery state shows a thermal runaway trend.

[0016] Optionally, waking up a second uninterruptible power supply in the energy storage battery cabinet includes:

[0017] Control at least one battery cluster or at least one battery module in the energy storage battery cabinet to serve as a backup input power source for the second uninterruptible power supply, so that the second uninterruptible power supply enters a working state.

[0018] Optionally, waking up a second uninterruptible power supply in the energy storage battery cabinet includes:

[0019] The second uninterruptible power supply is controlled to start based on its own backup input power supply and enter a working state.

[0020] Optionally, after waking up the second uninterruptible power supply in the energy storage battery cabinet, the method further includes:

[0021] The second uninterruptible power supply replaces the first uninterruptible power supply to supply power to the BMS.

[0022] Optionally, the security unit performs security work including:

[0023] The detection control unit in the security unit determines whether a fire has occurred based on the security detection signal;

[0024] If it is confirmed that a fire has occurred, the detection control unit activates a security actuator in the security unit.

[0025] Optionally, before waking up the second uninterruptible power supply in the energy storage battery cabinet, the method further includes:

[0026] The BMS exchanges information with the detection control unit in the security unit, so that the detection control unit is powered;

[0027] The detection control unit determines whether a fire has occurred based on the security detection signal;

[0028] If it is confirmed that a fire has occurred, the detection control unit executes the step of waking up the second uninterruptible power supply in the energy storage battery cabinet.

[0029] Optionally, the security unit performs security work including:

[0030] If it is confirmed that a fire has occurred, the detection control unit activates a security actuator in the security unit.

[0031] Optionally, after the BMS determines whether the battery state meets a preset thermal runaway condition, the BMS further includes:

[0032] If the battery state does not meet the preset thermal runaway condition, the BMS enters a dormant state.

[0033] The second aspect of the present application provides an energy storage battery cabinet, comprising: at least one battery cluster, a BMS, a second uninterruptible power supply and a security unit; wherein,

[0034] At least one battery module is connected in series in the battery cluster;

[0035] Each of the battery clusters is connected to the positive and negative battery interfaces respectively;

[0036] The first input end of the second uninterruptible power supply is connected to the mains interface, the second input end of the second uninterruptible power supply is connected to the backup input power supply, and the output end of the second uninterruptible power supply is respectively connected to the power supply end of the security unit and the power supply end of the BMS;

[0037] The BMS is provided with a corresponding first uninterruptible power supply;

[0038] The BMS and the security unit are used together to execute the security self-starting method of the energy storage battery cabinet as described in any one of the first aspects above.

[0039] Optionally, the second input terminal of the second uninterruptible power supply is connected to the backup input power supply through a relay;

[0040] The relay is controlled by the detection control unit of the BMS or the security unit through a corresponding drive circuit;

[0041] The power supply end of the driving circuit is connected to the output end of the second uninterruptible power supply and the first uninterruptible power supply respectively.

[0042] Optionally, a manual switch is further provided between the second input terminal of the second uninterruptible power supply and the backup input power supply.

[0043] Optionally, the backup input power source includes: at least one of the battery clusters or at least one of the battery modules;

[0044] The second uninterruptible power supply is an AC / DC dual-input power supply.

[0045] Optionally, the backup input power source includes: a power converter of at least one of the battery clusters or at least one of the battery modules;

[0046] The second uninterruptible power supply includes: an AC input power supply and a subsequent switching power supply.

[0047] Optionally, the security unit includes: the detection control unit, a security actuator, and a detection module:

[0048] The output end of the detection module is connected to the input end of the detection control unit;

[0049] The output end of the detection control unit is connected to the control end of the security actuator.

[0050] Optionally, the security actuator includes: at least one of an active exhaust structure and a fire extinguishing device;

[0051] The detection module includes at least one of a smoke sensor, a temperature sensor, a fire detection tube and a combustible gas detection module.

[0052] The present application provides a security self-starting method for an energy storage battery cabinet. When the energy storage battery cabinet has no mains input, the BMS periodically wakes up based on its own first uninterruptible power supply and detects the battery status after waking up. Then, if the BMS determines that the battery status meets a preset thermal runaway condition, it wakes up the second uninterruptible power supply in the energy storage battery cabinet to power the security unit in the energy storage battery cabinet, thereby enabling the security unit to perform security work. That is, the present application can not only realize periodic detection of battery safety faults without external power supply, but also start the second uninterruptible power supply in a timely manner, ensuring the function of the security unit, protecting the fire safety of the entire equipment, and reducing security risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings to be used in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0054] Figure 1 、 Figure 2a and Figure 2b These are three flow charts of the security self-starting method of the energy storage battery cabinet provided in the embodiments of the present application;

[0055] Figure 3 、 Figure 4a and Figure 5a These are three structural schematic diagrams of energy storage battery cabinets provided in the embodiments of the present application;

[0056] Figure 4b and Figure 5b They are two specific structural schematic diagrams of the energy storage battery cabinet provided in the embodiments of the present application. DETAILED DESCRIPTION

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0058] In this application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0059] When there is no auxiliary power supply from the mains, the security function of the energy storage battery cabinet cannot be guaranteed. In reality, there have been actual cases where large energy storage battery cabinets caught fire during transportation. Therefore, this embodiment provides a security self-starting method for an energy storage battery cabinet to reduce security risks and improve safety.

[0060] Referring to FIG2 , the security self-starting method of the energy storage battery cabinet includes:

[0061] S101. When there is no mains power input to the energy storage battery cabinet, the BMS (Battery Management System) in the energy storage battery cabinet wakes up periodically based on its own first uninterruptible power supply, and detects the battery status after waking up.

[0062] Typically, a battery storage cabinet contains multiple battery clusters connected in parallel, each with at least one battery module connected in series. The BMS is typically divided into: an SMU (battery system management unit), a CMU (cell monitor unit) for each battery cluster, and a BMU (battery management unit) inside each battery module.

[0063] To achieve periodic wake-up, at least each BMU needs to be equipped with a corresponding first uninterruptible power supply, such as a board-level uninterruptible power supply, to achieve the first wake-up of each BMU. After each BMU detects the corresponding battery cell unit, temperature, impedance and other information, it will communicate with the corresponding CMU to wake up the corresponding CMU, enabling the CMU to detect the battery cell status within the cluster based on the above information.

[0064] That is, step S101 may specifically include: Figure 2a and Figure 2b As shown in:

[0065] S111 . Each BMU in the BMS is awakened periodically based on its own first uninterruptible power supply.

[0066] S112 : After waking up, each BMU detects the cell voltage, temperature, and impedance of the corresponding battery module, and sends the information to the CMU in the BMS to form a battery status.

[0067] After completing step S101, step S102 may be executed.

[0068] S102 : The BMS determines whether the battery status meets a preset thermal runaway condition.

[0069] Specifically, this step may be: the CMU in the BMS determines whether the battery state shows a trend of thermal runaway.

[0070] The CMU determines whether thermal runaway is currently occurring based on information such as the voltage, temperature, and impedance of each battery cell. If so, the battery status meets the preset thermal runaway conditions, and step S103 needs to be executed. If the battery status does not meet the preset thermal runaway conditions, the BMS can enter a dormant state again and wake up after a waiting period.

[0071] S103. The BMS wakes up the second uninterruptible power supply in the energy storage battery cabinet to supply power to the security unit in the energy storage battery cabinet.

[0072] In the energy storage battery cabinet, when there is no mains power to provide auxiliary power supply, steps S101 and S102 enable the BMS to start and perform detection based on its own first uninterruptible power supply. When it detects a trend of thermal runaway, it indicates that it is necessary to start the security unit. In this embodiment, the security unit of the energy storage battery cabinet is equipped with a corresponding second uninterruptible power supply. In the absence of mains power input, the second uninterruptible power supply powers the security unit, thereby avoiding the problem of the security unit being without power and unable to start due to the lack of mains power input.

[0073] S104: The security unit performs security work.

[0074] The security unit can start normally after receiving power supply. If a fire is confirmed, protective measures such as timely discharge of combustible gas in the cabinet and activation of fire extinguishing devices can be taken to ensure fire safety.

[0075] The security self-starting method for the energy storage battery cabinet provided in this embodiment realizes timely detection of battery safety faults by designing board-level uninterruptible power supply and periodic wake-up for the BMS without external power supply. It can also realize autonomous startup of the second uninterruptible power supply in a timely manner when there is a trend of thermal runaway, ensuring the function of the security unit, protecting the fire safety of the entire equipment, and reducing security risks.

[0076] Based on the previous embodiment, the energy storage battery cabinet security self-starting method, in which step S103 of waking up the second uninterruptible power supply in the energy storage battery cabinet, can be implemented in various forms, such as:

[0077] (1) Control at least one battery cluster or at least one battery module in the energy storage battery cabinet as a backup input power source provided by the second uninterruptible power supply, so that the second uninterruptible power supply enters a working state.

[0078] In actual applications, an AC / DC dual-input power supply can be set as the second uninterruptible power supply. Normally, it uses the mains input. When the mains power is abnormal or there is no mains input, it is powered by the corresponding battery cluster or battery module in the energy storage battery cabinet to achieve the purpose of uninterruptible power supply.

[0079] (2) Control the second uninterruptible power supply to start based on its own backup input power supply and enter the working state.

[0080] In practice, an AC input power supply and its subsequent switching power supply can be configured to form the second uninterruptible power supply. Normally, the AC input power supply is the mains power supply. When the mains power supply is abnormal or there is no mains power input, the AC input power supply is powered by its own battery or a power converter composed of at least one battery cluster or at least one battery module, which serves as the backup input power supply.

[0081] The above two methods are optional and are not limited to them. They can be determined according to their specific application environment and are both within the scope of protection of this application.

[0082] Furthermore, after waking up the second uninterruptible power supply in the energy storage battery cabinet, the security self-starting method may further include: using the second uninterruptible power supply to power the BMS instead of the first uninterruptible power supply. This can save the usage time of the first uninterruptible power supply and extend its service life.

[0083] On the basis of the above embodiment, in the security self-starting method of the energy storage battery cabinet, step S104, the security unit performs security work, which may specifically include Figure 2a As shown in:

[0084] S401: The detection control unit in the security unit determines whether a fire has occurred based on the security detection signal.

[0085] The detection control unit directly receives power from the second uninterruptible power supply, and determines whether a fire has occurred based on a security detection signal formed by output signals of at least one of the smoke sensor, temperature sensor, fire detection tube, and combustible gas detection module. If a fire is confirmed, step S402 is executed.

[0086] S402: The detection control unit activates the security actuator in the security unit.

[0087] The security actuator includes: at least one of an active exhaust structure and a fire extinguishing device; once a fire is confirmed to have formed, the active exhaust can be activated to achieve timely discharge of combustible gas, and at the same time, the fire extinguishing device can be activated as an alternative to spray fire-fighting agents; it depends on the specific application environment and is within the scope of protection of this application.

[0088] Alternatively, the security self-starting method of the energy storage battery cabinet is as follows: Figure 2b As shown, before the step of waking up the second uninterruptible power supply in the energy storage battery cabinet in step S103, it also includes:

[0089] S201. The BMS exchanges information with the detection control unit in the security unit, so that the detection control unit is powered.

[0090] This process can specifically be communication or control through an IO port, depending on its application environment, and is all within the scope of protection of this application.

[0091] S202: The detection control unit determines whether a fire has occurred based on the security detection signal.

[0092] If it is confirmed that a fire has occurred, step S203 is executed.

[0093] S203: The detection control unit wakes up the second uninterruptible power supply in the energy storage battery cabinet.

[0094] At this time, in step S104, the security unit performs security work, specifically including:

[0095] If it is confirmed that a fire has occurred, step S403 is executed.

[0096] S403: The detection control unit activates the security actuator in the security unit.

[0097] That is, the detection control unit in the security unit can be as follows Figure 2a As shown in , fire detection is performed after the second uninterruptible power supply is obtained, or, alternatively, Figure 2bAs shown in , when the CMU receives the communication signal from the corresponding BMU and completes the wake-up power-up, it is also powered at the same time, thereby performing fire detection. It depends on the specific application environment and is within the scope of protection of this application.

[0098] Another embodiment of the present application further provides an energy storage battery cabinet, such as Figure 3 As shown, it includes: at least one battery cluster 10, a BMS (not shown), a second uninterruptible power supply 20 and a security unit 30; wherein:

[0099] At least one battery module 101 is connected in series in the battery cluster 10 ( Figure 3 Each battery cluster 10 is connected to the positive and negative electrode interfaces of the battery respectively.

[0100] The first input end of the second uninterruptible power supply 20 is connected to the mains interface, and the second input end of the second uninterruptible power supply 20 is connected to the backup input power supply; the output ends of the second uninterruptible power supply 20 are respectively connected to the power supply end of the security unit 30 and the power supply end of the BMS. The output voltages of the two output ends are determined according to the requirements of the devices to which they are connected, and are not limited here.

[0101] The BMS is provided with a corresponding first uninterruptible power supply; the first uninterruptible power supply can be specifically Li-SOCl2, but is not limited thereto. When used, such a lithium battery is welded to a PCB (Printed Circuit Board) control board to form a corresponding board-level uninterruptible power supply.

[0102] The BMS and the security unit 30 are used together to execute the security self-starting method for the energy storage battery cabinet as described in any of the above embodiments. The specific process and principle of the security self-starting method can be referred to the above embodiments and will not be repeated here.

[0103] In actual applications, two power supply routes can be designed for the BMS and the security unit 30, one is a second uninterruptible power supply with normal mains power supply, and the other is a board-level uninterruptible power supply. In the absence of normal mains power supply, the BMU with low weak current loss can be used to wake up the BMS from sleep mode at regular intervals, and complete the battery status detection to determine whether there are safety faults such as thermal runaway. If not, it continues to enter sleep mode. If so, a trigger signal is sent to trigger the uninterruptible power supply with high power consumption, so that the security unit 30 is powered on and emergency fire-fighting measures are initiated, such as active exhaust and pressure relief, to achieve fire extinguishing and explosion prevention.

[0104] In actual application, the energy storage battery cabinet should also be equipped with a corresponding power distribution unit. Figure 4a and 5aIn the figure, battery clusters or battery modules are shown using battery packs as examples. Each battery cluster (such as battery pack 1, battery pack 2, ..., battery pack n as shown in the figure) has its own battery pack distribution unit (such as battery pack distribution 1, battery pack distribution 2, ..., battery pack distribution n as shown in the figure); and each battery pack distribution module is also connected to the positive and negative electrode interfaces of the battery through the battery stack distribution unit.

[0105] like Figure 4a As shown in FIG, the backup input power source includes at least one battery pack, which can be Figure 3 Any battery cluster 10 or any battery module 101 shown in FIG; at this time, the second uninterruptible power supply 20 is an AC / DC dual-input power supply.

[0106] See Figure 4b The second input terminal of the second uninterruptible power supply 20 is connected to the backup input power supply through a relay K; the relay K is controlled by the detection control unit 301 of the BMS or the security unit 30 through a corresponding drive circuit; the power supply end of the drive circuit is respectively connected to the output terminal of the second uninterruptible power supply 20 and the first uninterruptible power supply.

[0107] At this point, the security unit 30 implements the uninterruptible power supply logic: the BMS detects a safety fault through in-cluster cell status detection and issues a trigger signal 1 to the drive circuit. Alternatively, the detection control unit 301 of the security unit 30 identifies a safety fault and issues a trigger signal 2 to the drive circuit, causing the coil of relay K to energize, thereby providing DC input power to the second uninterruptible power supply 20. After conversion, it provides power to the drive circuit of relay K, the security unit 30, and the BMS. The drive circuit of relay K and the BMS switch to board-level uninterruptible power supply mode. The detection control unit 301 issues a trigger signal 3 to initiate active exhaust, ensuring the timely discharge of combustible gases and simultaneously activating the fire extinguishing device as an alternative.

[0108] In practical applications, a second input terminal of the second uninterruptible power supply 20 and the backup input power supply may also be provided. Figure 4b The manual switch MSD shown in FIG. 1 is used to implement manual control of the second uninterruptible power supply 20 receiving the backup input power supply.

[0109] Or, as Figure 5a As shown, the backup input power supply includes: a power converter of at least one battery pack (such as battery pack manager 1, battery pack manager 2, ..., battery pack manager n as shown in the figure); the battery pack can be Figure 3 Any battery cluster 10 or any battery module 101 shown in FIG; In this case, the second uninterruptible power supply 20 includes Figure 5b As shown in FIG: an AC input power supply 201 and a subsequent switching power supply 202 .

[0110] See also Figure 5b At this point, the security unit 30 implements uninterruptible power supply logic as follows: the BMS identifies a safety fault and sends a trigger signal 1 to the control card of the AC input power supply 201. Alternatively, the detection and control unit 301 of the security unit 30 identifies a safety fault and sends a trigger signal 2 to the control card of the AC input power supply 201. This activates the AC input power supply 201 in the second uninterruptible power supply 20 and outputs AC power, which, after conversion by the switching power supply 202, provides power to the security unit 30 and the BMS. The BMS then switches to board-level uninterruptible power supply mode. The detection and control unit 301 of the security unit 30 sends a trigger signal 3 to initiate active exhaust, ensuring the timely discharge of combustible gases and simultaneously activating the optional fire extinguishing device.

[0111] In practical applications, the security unit 30 includes: a detection control unit 301, a security actuator 302 and a detection module 303, wherein:

[0112] The output end of the detection module 303 is connected to the input end of the detection control unit 301 ; the output end of the detection control unit 301 is connected to the control end of the security actuator 302 .

[0113] The security actuator 302 includes at least one of an active exhaust structure and a fire extinguishing device ( Figure 4b and Figure 5b Only the active exhaust structure is shown); the detection module 303 includes: at least one of a smoke sensor, a temperature sensor, a fire detection tube and a combustible gas detection module.

[0114] The same or similar parts between the various embodiments in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Ordinary technicians in this field can understand and implement it without making any creative efforts.

[0115] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0116] With respect to the above description of the disclosed embodiments, the features described in the various embodiments in this specification may be interchanged or combined to enable those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A security self-starting method for an energy storage battery cabinet, characterized in that: include: When there is no mains power input to the energy storage battery cabinet, the battery management system BMS in the energy storage battery cabinet is awakened periodically based on its own first uninterruptible power supply, and detects the battery status after waking up; The BMS determines whether the battery state meets a preset thermal runaway condition; If the battery state meets the preset thermal runaway condition, the BMS wakes up the second uninterruptible power supply in the energy storage battery cabinet to supply power to the security unit in the energy storage battery cabinet; The security unit performs security work.

2. The security self-starting method of the energy storage battery cabinet according to claim 1, characterized in that: The battery management system BMS in the energy storage battery cabinet periodically wakes up based on its own first uninterruptible power supply and detects the battery status after waking up, including: Each battery module management unit (BMU) in the BMS is periodically awakened based on its own first uninterruptible power supply; After waking up, each BMU detects the cell voltage, temperature, and impedance of the corresponding battery module, and sends the detected data to the battery cluster management unit (CMU) in the BMS to form the battery status.

3. The security self-starting method of the energy storage battery cabinet according to claim 1, characterized in that: The BMS determines whether the battery state meets a preset thermal runaway condition, including: The CMU in the BMS determines whether the battery state shows a thermal runaway trend.

4. The security self-starting method of the energy storage battery cabinet according to claim 1, characterized in that: Waking up the second uninterruptible power supply in the energy storage battery cabinet includes: Control at least one battery cluster or at least one battery module in the energy storage battery cabinet to serve as a backup input power source for the second uninterruptible power supply, so that the second uninterruptible power supply enters a working state.

5. The security self-starting method of the energy storage battery cabinet according to claim 1, characterized in that: Waking up the second uninterruptible power supply in the energy storage battery cabinet includes: The second uninterruptible power supply is controlled to start based on its own backup input power supply and enter a working state.

6. The security self-starting method of the energy storage battery cabinet according to claim 1, characterized in that: After waking up the second uninterruptible power supply in the energy storage battery cabinet, the method further includes: The second uninterruptible power supply replaces the first uninterruptible power supply to supply power to the BMS.

7. The security self-starting method of the energy storage battery cabinet according to any one of claims 1 to 6, characterized in that: The security unit performs security work, including: The detection control unit in the security unit determines whether a fire has occurred based on the security detection signal; If it is confirmed that a fire has occurred, the detection control unit activates a security actuator in the security unit.

8. The security self-starting method of the energy storage battery cabinet according to any one of claims 1 to 6, characterized in that: Before waking up the second uninterruptible power supply in the energy storage battery cabinet, the method further includes: The BMS exchanges information with the detection control unit in the security unit, so that the detection control unit is powered; The detection control unit determines whether a fire has occurred based on the security detection signal; If it is confirmed that a fire has occurred, the detection control unit executes the step of waking up the second uninterruptible power supply in the energy storage battery cabinet.

9. The security self-starting method of the energy storage battery cabinet according to claim 8, characterized in that: The security unit performs security work, including: If it is confirmed that a fire has occurred, the detection control unit activates a security actuator in the security unit.

10. The security self-starting method of the energy storage battery cabinet according to any one of claims 1 to 6, characterized in that: After the BMS determines whether the battery state meets a preset thermal runaway condition, the method further includes: If the battery state does not meet the preset thermal runaway condition, the BMS enters a dormant state.

11. An energy storage battery cabinet, characterized in that: include: At least one battery cluster, BMS, second uninterruptible power supply and security unit; wherein, At least one battery module is connected in series in the battery cluster; Each of the battery clusters is connected to the positive and negative battery interfaces respectively; The first input end of the second uninterruptible power supply is connected to the mains interface, the second input end of the second uninterruptible power supply is connected to the backup input power supply, and the output end of the second uninterruptible power supply is respectively connected to the power supply end of the security unit and the power supply end of the BMS; The BMS is provided with a corresponding first uninterruptible power supply; The BMS and the security unit are used together to execute the security self-starting method of the energy storage battery cabinet according to any one of claims 1 to 10.

12. The energy storage battery cabinet according to claim 11, characterized in that: The second input terminal of the second uninterruptible power supply is connected to the backup input power supply through a relay; The relay is controlled by the detection control unit of the BMS or the security unit through a corresponding drive circuit; The power supply end of the driving circuit is connected to the output end of the second uninterruptible power supply and the first uninterruptible power supply respectively.

13. The energy storage battery cabinet according to claim 12, characterized in that: A manual switch is further provided between the second input terminal of the second uninterruptible power supply and the backup input power supply.

14. The energy storage battery cabinet according to claim 11, characterized in that: The backup input power source includes: at least one battery cluster or at least one battery module; The second uninterruptible power supply is an AC / DC dual-input power supply.

15. The energy storage battery cabinet according to claim 11, characterized in that: The backup input power source includes: a power converter of at least one of the battery clusters or at least one of the battery modules; The second uninterruptible power supply includes: an AC input power supply and a subsequent switching power supply.

16. The energy storage battery cabinet according to any one of claims 11 to 15, characterized in that: The security unit includes: a detection control unit, a security actuator and a detection module: The output end of the detection module is connected to the input end of the detection control unit; The output end of the detection control unit is connected to the control end of the security actuator.

17. The energy storage battery cabinet according to claim 16, characterized in that: The security actuator includes: at least one of an active exhaust structure and a fire extinguishing device; The detection module includes at least one of a smoke sensor, a temperature sensor, a fire detection tube and a combustible gas detection module.

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