Explosion-proof valve control circuit and energy storage cabinet

Abstract

According to the explosion-proof valve control circuit and the energy storage cabinet, the temperature of a single battery in the energy storage cabinet is monitored through a monitoring circuit, an explosion-proof valve opening signal is generated when the temperature of the single battery is larger than the thermal runaway critical temperature, and a passive trigger circuit controls an explosion-proof valve to be opened according to the explosion-proof valve opening signal; the active trigger circuit monitors the air pressure change in the energy storage cabinet within a preset time period after receiving the explosion-proof valve opening signal, if the air pressure change in the energy storage cabinet within the preset time period meets a preset active trigger condition, an active trigger signal is generated, and the explosion-proof execution component physically impacts the explosion-proof valve according to the active trigger signal, so that the explosion-proof valve is opened. Therefore, multiple safety protection mechanisms are provided for the energy storage cabinet, even if the anti-explosion valve loses efficacy, pressure relief can still be achieved through active impact, and the explosion risk caused by thermal runaway of the energy storage cabinet is greatly reduced.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, specifically to an explosion-proof valve control circuit and an energy storage cabinet. Background Technology

[0002] With increasing attention and demand for renewable energy sources such as solar and wind power, commercial and industrial energy storage cabinets have become a popular choice, especially in remote areas or regions with unstable power supply, where energy storage is crucial. Commercial and industrial energy storage can handle peak electricity demand by charging the storage batteries during off-peak hours and discharging during peak hours, avoiding high electricity bills. Furthermore, commercial and industrial energy storage can also cope with grid faults or power outages, serving as a backup power source.

[0003] In current industrial and commercial energy storage cabinets, the explosion-proof valve is a key component for ensuring equipment safety. Its core function is to release pressure through passive pressure or temperature triggering when dangerous situations such as thermal runaway or sudden pressure rise occur inside the cabinet, preventing the cabinet from bursting and the accident from escalating. However, existing explosion-proof valves generally rely on their own mechanical structure or thermally sensitive elements for triggering, which has significant technical defects: when the explosion-proof valve fails to perform its passive triggering function due to mechanical jamming, component aging, or sealing failure, if the battery inside the energy storage cabinet experiences thermal runaway (e.g., the battery temperature exceeds 100°C), the pressure inside the cabinet cannot be released normally through the explosion-proof valve, which can easily lead to cabinet bursting, electrolyte splashing, and even serious safety accidents such as fire and explosion, posing a significant safety threat to the energy storage cabinet and the surrounding environment. Summary of the Invention

[0004] In view of the above problems, this application provides an explosion-proof valve control circuit and an energy storage cabinet, which can solve the risk of thermal runaway caused by the failure of the explosion-proof valve on the energy storage cabinet.

[0005] A first aspect of this application provides an explosion-proof valve control circuit applied to an energy storage cabinet, wherein the energy storage cabinet is equipped with an explosion-proof valve, and the explosion-proof valve control circuit includes: The monitoring circuit is used to monitor the temperature of the individual battery cells in the energy storage cabinet and generate an explosion-proof valve opening signal when the temperature of the individual battery cells exceeds the thermal runaway critical temperature. A passive triggering circuit, connected to the monitoring circuit, is used to receive the explosion-proof valve opening signal and control the explosion-proof valve to open according to the explosion-proof valve opening signal; An active triggering circuit, connected to the monitoring circuit, is used to receive the explosion-proof valve opening signal and monitor the air pressure change in the energy storage cabinet within a preset time period after receiving the explosion-proof valve opening signal. If the air pressure change in the energy storage cabinet within the preset time period meets the preset active triggering conditions, an active triggering signal is generated. An explosion-proof actuator, connected to the active triggering circuit, is used to receive the active triggering signal and physically impact the explosion-proof valve according to the active triggering signal, so as to open the explosion-proof valve.

[0006] In some embodiments, the active triggering circuit is further configured to determine that the change in air pressure in the energy storage cabinet meets the preset active triggering condition when the air pressure in the energy storage cabinet is greater than a first preset threshold air pressure at the end of the preset time period.

[0007] In some embodiments, the active triggering circuit is further configured to determine that the air pressure change in the energy storage cabinet meets the preset active triggering condition if the difference between the maximum and minimum values ​​of the air pressure change curve in the energy storage cabinet within the preset time period is less than a preset difference.

[0008] In some embodiments, the active triggering circuit is further configured to determine that the explosion-proof valve is normally opened when the gas pressure change curve in the energy storage cabinet is a downward curve within the preset time period and the maximum slope of the gas pressure change curve is less than a preset threshold slope.

[0009] In some embodiments, the active triggering circuit is further configured to calculate the number of times the air pressure in the energy storage cabinet is greater than a second preset threshold air pressure within the preset time period, and determine that the air pressure change in the energy storage cabinet meets the preset active triggering condition if the number of times is greater than a preset number; the second preset threshold air pressure is less than the first preset threshold air pressure.

[0010] In some embodiments, the explosion-proof valve control circuit further includes: The battery management circuit is used to acquire the battery parameters of the individual battery cells in the energy storage cabinet, and the passive triggering circuit and the active triggering circuit are integrated into the battery management circuit.

[0011] In some embodiments, the monitoring circuit includes a plurality of temperature sensors and a slave controller, wherein the plurality of temperature sensors correspond to a plurality of battery cells in the energy storage cabinet, and the plurality of temperature sensors are respectively used to collect the temperature of the plurality of battery cells; The controller generates an explosion-proof valve opening signal when the temperature of any of the battery cells collected by the temperature sensor is greater than the thermal runaway critical temperature.

[0012] In some embodiments, the explosion-proof valve control circuit further includes: An electromagnetic push rod is connected to the explosion-proof valve and the passive triggering circuit, and is used to open the explosion-proof valve according to the explosion-proof valve opening signal.

[0013] A second aspect of this application also provides an energy storage cabinet, including: a plurality of battery cells, a cabinet body, an explosion-proof valve, and an explosion-proof valve control circuit as described in any one of the above embodiments, wherein the plurality of battery cells are disposed inside the cabinet body, and the explosion-proof valve is disposed on the cabinet body.

[0014] In some embodiments, the explosion-proof actuator is disposed opposite to the preset impact area of ​​the explosion-proof valve, and the thickness of the preset impact area is less than the average thickness of the explosion-proof valve.

[0015] The beneficial effects of this application embodiment are as follows: The monitoring circuit monitors the temperature of the battery cells in the energy storage cabinet, and generates an explosion-proof valve opening signal when the temperature of the battery cells exceeds the thermal runaway critical temperature. The passive triggering circuit controls the explosion-proof valve to open according to the explosion-proof valve opening signal. The active triggering circuit monitors the air pressure change in the energy storage cabinet within a preset time period after receiving the explosion-proof valve opening signal. If the air pressure change in the energy storage cabinet within the preset time period meets the preset active triggering conditions, an active triggering signal is generated. The explosion-proof actuator physically impacts the explosion-proof valve according to the active triggering signal to open the explosion-proof valve, thereby providing multiple safety protection mechanisms for the energy storage cabinet. Even if the explosion-proof valve itself fails, it can still achieve pressure relief through active impact, greatly reducing the risk of explosion caused by thermal runaway of the energy storage cabinet.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of a first structure of the explosion-proof valve control circuit provided in an embodiment of this application; Figure 2 This is a schematic diagram of a second structure of the explosion-proof valve control circuit provided in an embodiment of this application. Detailed Implementation

[0018] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0020] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The phrase "second connection port" at various locations in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0023] In the description of the embodiments of this application, the term "multiple frames" refers to two or more (including two).

[0024] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0025] In current industrial and commercial energy storage cabinets, the explosion-proof valve is a key component for ensuring equipment safety. Its core function is to release pressure through passive pressure or temperature triggering when dangerous situations such as thermal runaway or sudden pressure rise occur inside the cabinet, preventing the cabinet from bursting and the accident from escalating. However, existing explosion-proof valves generally rely on their own mechanical structure or thermally sensitive elements for triggering, which has significant technical defects: when the explosion-proof valve fails to perform its passive triggering function due to mechanical jamming, component aging, or sealing failure, if the battery inside the energy storage cabinet experiences thermal runaway (e.g., the battery temperature exceeds 100°C), the pressure inside the cabinet cannot be released normally through the explosion-proof valve, which can easily lead to cabinet bursting, electrolyte splashing, and even serious safety accidents such as fire and explosion, posing a significant safety threat to the energy storage cabinet and the surrounding environment.

[0026] To address the aforementioned technical problems, this application provides an explosion-proof valve control circuit. This circuit is applied to an energy storage cabinet, which is equipped with an explosion-proof valve. (See also...) Figure 1 As shown, the explosion-proof valve control circuit includes: a monitoring circuit 100, a passive triggering circuit 200, an active triggering circuit 300, and an explosion-proof actuator 400. The monitoring circuit 100 monitors the temperature of the individual battery cells in the energy storage cabinet and generates an explosion-proof valve opening signal when the temperature of the individual battery cells exceeds the thermal runaway critical temperature. The passive triggering circuit 200 is connected to the monitoring circuit 100 and receives the explosion-proof valve opening signal, controlling the explosion-proof valve 500 to open according to the signal. The active triggering circuit 300 is connected to the monitoring circuit 100 and receives the explosion-proof valve opening signal. Within a preset time period after receiving the signal, it monitors the pressure change in the energy storage cabinet. If the pressure change within the cabinet meets the preset active triggering conditions, it generates an active triggering signal. The explosion-proof actuator 400 is connected to the active triggering circuit 300 and receives the active triggering signal. Based on the signal, it physically impacts the explosion-proof valve 500 to open it.

[0027] In this embodiment, the monitoring circuit 100 monitors the temperature of the individual battery cells in the energy storage cabinet, and generates an explosion-proof valve opening signal when the temperature of the individual battery cells exceeds the thermal runaway critical temperature. The passive triggering circuit 200 and the active triggering circuit 300 form a dual-line parallel triggering architecture. The passive triggering circuit 200 controls the explosion-proof valve 500 to open according to the explosion-proof valve opening signal. Furthermore, if the passive triggering mechanism is ineffective after a preset time period following its activation, the active triggering mechanism is triggered. At this time, both the active triggering circuit 300 and the passive triggering circuit 200 simultaneously receive the explosion-proof valve opening signal. When the explosion-proof opening signal is activated, the active trigger circuit 300 continuously monitors the pressure change inside the energy storage cabinet within a preset time period after activation. If the pressure change inside the energy storage cabinet meets the preset active triggering conditions within the preset time period, an active triggering signal is generated. The explosion-proof actuator 400 physically impacts the explosion-proof valve 500 according to the active triggering signal, thereby opening the explosion-proof valve 500 and providing multiple safety protection mechanisms for the energy storage cabinet. Even if the explosion-proof valve 500 itself fails, it can still achieve pressure relief through active impact, significantly reducing the risk of explosion caused by thermal runaway of the energy storage cabinet.

[0028] In some embodiments, the preset time period can be 5-6 seconds. That is, after the active triggering circuit 300 is activated, it delays for a preset time period. If the passive triggering circuit 200 fails or the explosion-proof valve 500 itself fails during the preset time period, the active triggering condition is met. The active triggering circuit 300 controls the explosion-proof actuator 400 to actively impact the explosion-proof valve 500 to release pressure, thereby significantly reducing the risk of explosion caused by thermal runaway of the energy storage cabinet.

[0029] In some embodiments, the preset time period can be 5-6 seconds. By setting a delay judgment between the two parallel triggering mechanisms, the passive triggering circuit 200 and the active triggering circuit 300, false triggering is avoided, and it is ensured that when the explosion-proof valve 500 does fail, the entire process from temperature exceeding the threshold to the completion of impact triggering can be completed within 6 seconds (impact response time can be within 1 second), which is much faster than the speed of manual intervention and effectively curbs the expansion of the accident.

[0030] In some embodiments, the thermal runaway critical temperature can be set between 80-100°C.

[0031] In some embodiments, the active triggering circuit 300 is further configured to determine that the change in air pressure in the energy storage cabinet meets the preset active triggering conditions when the air pressure in the energy storage cabinet is greater than the first preset threshold air pressure at the end of a preset time period.

[0032] In this embodiment, after receiving the explosion-proof opening signal, the active triggering circuit 300 records the current air pressure inside the energy storage cabinet and continuously monitors the air pressure change inside the energy storage cabinet within a preset time period. If the air pressure inside the energy storage cabinet is greater than the first preset threshold air pressure at the end of the preset time period, it indicates that the passive triggering circuit 200 has failed or the explosion-proof valve 500 itself has failed. The active triggering circuit 300 determines that the air pressure change inside the energy storage cabinet meets the preset active triggering conditions and outputs an active triggering signal. The explosion-proof actuator 400 performs a physical impact on the explosion-proof valve 500 according to the active triggering signal, so that the explosion-proof valve 500 opens to release pressure, greatly reducing the risk of explosion caused by thermal runaway of the energy storage cabinet.

[0033] In some embodiments, the active triggering circuit 300 is further configured to determine that the gas pressure change in the energy storage cabinet meets the preset active triggering conditions if the difference between the maximum and minimum values ​​of the gas pressure change curve in the energy storage cabinet within a preset time period is less than a preset difference.

[0034] In this embodiment, after receiving the explosion-proof opening signal, the active triggering circuit 300 records the current air pressure inside the energy storage cabinet and continuously monitors the air pressure change inside the energy storage cabinet within a preset time period, and records the air pressure change curve for the preset time period. If the difference between the maximum and minimum values ​​of the air pressure change curve is less than a preset difference, it indicates that the passive triggering circuit 200 has failed or the explosion-proof valve 500 itself has failed within the preset time period. The active triggering circuit 300 determines that the air pressure change inside the energy storage cabinet meets the preset active triggering conditions and outputs an active triggering signal. The explosion-proof actuator 400 performs a physical impact on the explosion-proof valve 500 according to the active triggering signal, so that the explosion-proof valve 500 opens to release pressure, which greatly reduces the risk of explosion caused by thermal runaway of the energy storage cabinet.

[0035] In some embodiments, the passive triggering circuit 200 and the active triggering circuit 300 can be set in different areas within the energy storage cabinet to prevent the two triggering circuits from being damaged by the explosion of a single battery cell and thus unable to control the explosion-proof valve 500 to open in time.

[0036] In some embodiments, the active triggering circuit 300 is further used to determine that the explosion-proof valve 500 is normally opened when the air pressure change curve in the energy storage cabinet is a downward curve within a preset time period and the maximum slope of the air pressure change curve is less than a preset threshold slope.

[0037] In this embodiment, after receiving the explosion-proof opening signal, the active trigger circuit 300 records the current air pressure inside the energy storage cabinet and continuously monitors the air pressure change inside the energy storage cabinet within a preset time period, and records the air pressure change curve within the preset time period. If the air pressure change curve is a downward curve and the maximum slope of the air pressure change curve is less than the preset threshold slope, it indicates that the explosion-proof valve 500 is normally opened, the air pressure inside the energy storage cabinet drops rapidly, the passive trigger circuit 200 can effectively open the explosion-proof valve 500, the active trigger circuit 300 does not need to output an active trigger signal, and the explosion-proof actuator 400 does not need to operate.

[0038] In some embodiments, the active triggering circuit 300 is further configured to calculate the number of times the air pressure in the energy storage cabinet is greater than the second preset threshold air pressure within a preset time period, and determine that the air pressure change in the energy storage cabinet meets the preset active triggering conditions if the number of times is greater than the preset number.

[0039] In this embodiment, if the gas pressure inside the energy storage cabinet experiences multiple pressure surges within a preset time period, and the maximum gas pressure during each pressure surge is greater than a second preset threshold gas pressure, while the second preset threshold gas pressure is less than a first preset threshold gas pressure, and the number of pressure surges exceeds a preset number, it indicates that multiple deflagrations have occurred inside the energy storage cabinet. This means the opening angle of the explosion-proof valve 500 is not as expected, or the explosion-proof valve 500 malfunctions and cannot quickly release pressure, requiring rapid opening. In this case, it is determined that the gas pressure change inside the energy storage cabinet meets the preset active triggering conditions. The active triggering circuit 300 generates an active triggering signal, and the explosion-proof actuator 400 physically impacts the explosion-proof valve 500 according to the active triggering signal to open the explosion-proof valve 500. This provides multiple safety protection mechanisms for the energy storage cabinet. Even if the explosion-proof valve 500 itself fails, it can still release pressure through active impact, significantly reducing the risk of explosion caused by thermal runaway of the energy storage cabinet.

[0040] In some embodiments, see Figure 2 As shown, the explosion-proof valve control circuit also includes a battery management circuit 600, which is used to obtain the battery parameters of the individual battery cells in the energy storage cabinet 900. The passive triggering circuit 200 and the active triggering circuit 300 are integrated into the battery management circuit 600.

[0041] In this embodiment, the battery management circuit 600 can be the battery management system (BMS) inside the energy storage cabinet 900. The battery management circuit 600 can monitor the battery parameters of any battery cell or battery module inside the energy storage cabinet 900 in real time. Multiple battery cells or multiple battery modules can form a battery pack. The battery parameters include battery temperature, battery voltage, etc. The passive triggering circuit 200 and the active triggering circuit 300 can both be integrated into the battery management system (BMS).

[0042] In some embodiments, combined with Figure 2As shown, the monitoring circuit 100 includes a pressure sensor 110. After the active triggering circuit 300 receives the explosion-proof opening signal, the pressure sensor 110 is activated synchronously. The pressure sensor 110 continuously monitors the air pressure change inside the energy storage cabinet 900 within a preset time period after activation. If the air pressure change inside the energy storage cabinet 900 within the preset time period meets the preset active triggering conditions, an active triggering signal is generated. The explosion-proof actuator 400 physically impacts the explosion-proof valve 500 according to the active triggering signal to open the explosion-proof valve 500, thereby providing multiple safety protection mechanisms for the energy storage cabinet 900. Even if the explosion-proof valve 500 itself fails, it can still achieve pressure relief through active impact, greatly reducing the risk of explosion caused by thermal runaway of the energy storage cabinet.

[0043] In some embodiments, some pressure sensors 110 inside the monitoring circuit 100 are individually connected to the active triggering circuit 300300 and are activated after the active triggering circuit 300 receives the explosion-proof opening signal. These pressure sensors 110 continuously monitor the air pressure change inside the energy storage cabinet 900 within a preset time period after activation and provide a corresponding air pressure detection signal to the active triggering circuit 300. The active triggering circuit 300 determines whether the air pressure change inside the energy storage cabinet 900 meets the preset active triggering conditions based on the air pressure detection signal.

[0044] In some embodiments, the preset time period can be 5 seconds. Taking 5 seconds as an example, if the internal pressure of the energy storage cabinet 900 shows a downward trend within 5 seconds (indicating that the explosion-proof valve 500 has been passively opened and is normally depressurizing), the active triggering process is terminated, and the explosion-proof actuator 400 (impact device) is not activated. If the internal pressure of the energy storage cabinet 900 continues to rise or remains stable within 5 seconds (indicating that the explosion-proof valve 500 has failed passive triggering and the pressure relief channel has not been opened), the explosion-proof valve 500 is determined to have failed, and the explosion-proof actuator 400 (impact device) is activated. The actuator of the explosion-proof actuator 400 moves rapidly, forcing the explosion-proof valve 500 to open through physical impact, thereby achieving emergency pressure relief inside the cabinet 900.

[0045] In some embodiments, combined with Figure 2 As shown, the monitoring circuit 100 includes multiple temperature sensors and a slave controller (such as...). Figure 2 The BMS (Brain Management System) in the system has multiple temperature sensors corresponding to multiple battery cells within the energy storage cabinet 900. Each temperature sensor is used to collect the temperature of a battery cell. When the temperature of a battery cell collected by any temperature sensor exceeds the thermal runaway critical temperature, the controller generates an explosion-proof valve opening signal.

[0046] In this embodiment, the controller establishes communication with the battery management circuit 600, providing the battery parameters within the battery pack to the battery management circuit 600. Furthermore, the controller can also judge the temperature of individual battery cells collected by temperature sensors. When the temperature of any individual battery cell collected by any temperature sensor exceeds the thermal runaway critical temperature, an explosion-proof valve opening signal is generated. Upon receiving the explosion-proof valve opening signal, the battery management circuit 600 immediately controls the explosion-proof valve 500 to open. The active triggering circuit 300 adopts a delay control strategy, continuously monitoring the air pressure change inside the energy storage cabinet during the delay period. If the air pressure change inside the energy storage cabinet meets the preset active triggering conditions within the preset time period, an active triggering signal is generated. The explosion-proof actuator 400 physically impacts the explosion-proof valve 500 according to the active triggering signal, thereby opening the explosion-proof valve 500. This provides multiple safety protection mechanisms for the energy storage cabinet. Even if the explosion-proof valve 500 itself fails, pressure can still be released through active impact, significantly reducing the risk of explosion caused by thermal runaway of the energy storage cabinet.

[0047] In some embodiments, the controller can simultaneously connect the passive triggering circuit 200 and the active triggering circuit 300 in parallel to prevent the explosion-proof valve 500 from failing to open due to single-line communication failure, thereby improving redundancy.

[0048] In some embodiments, combined with Figure 2 As shown, the explosion-proof valve control circuit also includes an electromagnetic push rod 410, which is connected to the explosion-proof valve 500 and the passive triggering circuit 200. The electromagnetic push rod 410 is used to open the explosion-proof valve 500 according to the explosion-proof valve opening signal.

[0049] In some embodiments, combined with Figure 2 As shown, the passive triggering circuit 200 is integrated into the battery management circuit 600. The battery management circuit 600 is connected to the electromagnetic push rod 410 via a control line and to the pressure sensor 110 via a signal line. When the temperature of a single battery cell collected by any temperature sensor exceeds the thermal runaway critical temperature, an explosion-proof valve opening signal is generated. Upon receiving the explosion-proof valve opening signal, the battery management circuit 600 sends a corresponding control signal to the electromagnetic push rod via the control line, causing the electromagnetic coil inside the electromagnetic push rod to drive the valve core, opening the explosion-proof valve 500 and depressurizing the energy storage cabinet 900.

[0050] This application embodiment also provides an energy storage cabinet, which includes: multiple battery cells, a cabinet body, an explosion-proof valve 500, and an explosion-proof valve control circuit as described above. The multiple battery cells are disposed inside the cabinet, and the explosion-proof valve 500 is disposed on the cabinet body.

[0051] In some embodiments, the explosion-proof actuator 400 is disposed opposite to the preset impact area of ​​the explosion-proof valve 500, and the thickness of the preset impact area is less than the average thickness of the explosion-proof valve 500. The beneficial effects of this application embodiment are as follows: The monitoring circuit 100 monitors the temperature of the battery cells in the energy storage cabinet, and generates an explosion-proof valve opening signal when the temperature of the battery cells exceeds the thermal runaway critical temperature. The passive triggering circuit 200 controls the explosion-proof valve 500 to open according to the explosion-proof valve opening signal. The active triggering circuit 300 monitors the air pressure change in the energy storage cabinet within a preset time period after receiving the explosion-proof valve opening signal. If the air pressure change in the energy storage cabinet within the preset time period meets the preset active triggering conditions, an active triggering signal is generated. The explosion-proof actuator 400 physically impacts the explosion-proof valve 500 according to the active triggering signal to open the explosion-proof valve 500, thereby providing multiple safety protection mechanisms for the energy storage cabinet. Even if the explosion-proof valve 500 itself fails, it can still achieve pressure relief through active impact, greatly reducing the risk of explosion caused by thermal runaway of the energy storage cabinet.

[0052] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0053] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0054] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the electronic device embodiments described above are merely illustrative. For example, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0055] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0056] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0057] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A control circuit for an explosion-proof valve, characterized in that, Applied to an energy storage cabinet, the energy storage cabinet is equipped with an explosion-proof valve, and the explosion-proof valve control circuit includes: The monitoring circuit is used to monitor the temperature of the individual battery cells in the energy storage cabinet and generate an explosion-proof valve opening signal when the temperature of the individual battery cells exceeds the thermal runaway critical temperature. A passive triggering circuit, connected to the monitoring circuit, is used to receive the explosion-proof valve opening signal and control the explosion-proof valve to open according to the explosion-proof valve opening signal; An active triggering circuit, connected to the monitoring circuit, is used to receive the explosion-proof valve opening signal and monitor the air pressure change in the energy storage cabinet within a preset time period after receiving the explosion-proof valve opening signal. If the air pressure change in the energy storage cabinet within the preset time period meets the preset active triggering conditions, an active triggering signal is generated. An explosion-proof actuator, connected to the active triggering circuit, is used to receive the active triggering signal and physically impact the explosion-proof valve according to the active triggering signal, so as to open the explosion-proof valve.

2. The explosion-proof valve control circuit according to claim 1, characterized in that, The active triggering circuit is also used to determine that the change in air pressure in the energy storage cabinet meets the preset active triggering condition when the air pressure in the energy storage cabinet is greater than the first preset threshold air pressure at the end of the preset time period.

3. The explosion-proof valve control circuit according to claim 1, characterized in that, The active triggering circuit is also used to determine that the air pressure change in the energy storage cabinet meets the preset active triggering condition if the difference between the maximum and minimum values ​​of the air pressure change curve in the energy storage cabinet within the preset time period is less than a preset difference.

4. The explosion-proof valve control circuit according to claim 1, characterized in that, The active triggering circuit is also used to determine that the explosion-proof valve is normally open when the gas pressure change curve in the energy storage cabinet is a downward curve within the preset time period and the maximum slope of the gas pressure change curve is less than a preset threshold slope.

5. The explosion-proof valve control circuit according to claim 2, characterized in that, The active triggering circuit is also used to calculate the number of times the air pressure in the energy storage cabinet is greater than the second preset threshold air pressure within the preset time period, and to determine that the air pressure change in the energy storage cabinet meets the preset active triggering condition if the number of times is greater than a preset number. The second preset threshold air pressure is less than the first preset threshold air pressure.

6. The explosion-proof valve control circuit according to any one of claims 1-5, characterized in that, The explosion-proof valve control circuit also includes: The battery management circuit is used to acquire the battery parameters of the individual battery cells in the energy storage cabinet, and the passive triggering circuit and the active triggering circuit are integrated into the battery management circuit.

7. The explosion-proof valve control circuit according to any one of claims 1-5, characterized in that, The monitoring circuit includes multiple temperature sensors and a slave controller. The multiple temperature sensors correspond to multiple battery cells in the energy storage cabinet, and the multiple temperature sensors are used to collect the temperature of the multiple battery cells. The controller generates an explosion-proof valve opening signal when the temperature of any of the battery cells collected by the temperature sensor is greater than the thermal runaway critical temperature.

8. The explosion-proof valve control circuit according to any one of claims 1-5, characterized in that, The explosion-proof valve control circuit also includes: An electromagnetic push rod is connected to the explosion-proof valve and the passive triggering circuit, and is used to open the explosion-proof valve according to the explosion-proof valve opening signal.

9. An energy storage cabinet, characterized in that, include: The device includes multiple battery cells, a cabinet, an explosion-proof valve, and an explosion-proof valve control circuit as described in any one of claims 1 to 8, wherein the multiple battery cells are disposed inside the cabinet, and the explosion-proof valve is disposed on the cabinet.

10. The energy storage cabinet according to claim 9, characterized in that, The explosion-proof actuator is positioned opposite to the preset impact area of ​​the explosion-proof valve, and the thickness of the preset impact area is less than the average thickness of the explosion-proof valve.

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