Battery assembly, actively extinguishing battery system, design method, and vehicle

Abstract

The application provides a battery assembly, an active fire extinguishing battery system, a design method and a vehicle. The battery assembly comprises: a box body having a plurality of accommodation cavities, at least one soft package module being arranged in each accommodation cavity; a heat removal system arranged in the box body, a plurality of through ends of a heat removal channel being arranged in one-to-one correspondence with the plurality of accommodation cavities, and an anti-explosion film being arranged at a communication position of each through end and the corresponding accommodation cavity; and a cooling system arranged in the box body, a water inlet being arranged in communication with an external water source, and a plurality of water outlets being arranged opposite to the soft package modules. When thermal runaway occurs in the soft package module, the heat removal system directs high-temperature gas and smoke generated by the thermal runaway of the soft package module out, and the cooling system directly discharges water from the water outlets to the soft package module, thereby avoiding the problem that the thermal runaway of the soft package module triggers the thermal runaway of other modules. By adopting the technical scheme, the problem that the soft package battery system is difficult to protect against thermal runaway is solved, the production cost of the soft package battery system is reduced, and the safety of the soft package battery system is improved.

Description

Technical Field

[0001] This invention relates to the field of power battery system technology, and more specifically, to a battery assembly, an active fire extinguishing battery system, a design method, and a vehicle. Background Technology

[0002] With the development of the new energy industry, the explosion and spontaneous combustion of new energy vehicle battery systems have received increasing attention. At present, the thermal runaway problem of shell battery systems has been effectively solved in the industry. However, due to the non-directional nature of pouch batteries, thermal runaway prevention and control is more difficult, and the thermal runaway problem of their battery systems has not yet been effectively solved. Summary of the Invention

[0003] The main objective of this invention is to provide a battery assembly, an active fire extinguishing battery system, a design method, and a vehicle to solve the problem of the difficulty in protecting against thermal runaway in existing pouch battery systems.

[0004] To achieve the above objectives, according to one aspect of the present invention, a battery assembly is provided, comprising a housing having a plurality of receiving cavities, each receiving cavity having at least one pouch module; a heat dissipation system disposed within the housing, the heat dissipation system having a heat dissipation channel having a plurality of conductive ends, the plurality of conductive ends being disposed one-to-one with the plurality of receiving cavities, and an explosion-proof membrane being disposed at the connection between each conductive end and the corresponding receiving cavity; and a cooling system disposed within the housing, the cooling system having an inlet connected to an external water source, the cooling system having a plurality of outlets, the outlets being disposed opposite to the pouch modules.

[0005] Furthermore, the heat dissipation system includes at least one exhaust pipe that extends along the length of the housing. The conducting end includes multiple end plates, each end plate being connected to the exhaust pipe via at least one transition structure. Each end plate is provided with at least one explosion-proof membrane. The end plate is located in a single receiving cavity, or the end plates are simultaneously located in two adjacent receiving cavities. A heat dissipation channel is formed within the exhaust pipe, the transition structure, and the end plates.

[0006] Furthermore, the heat dissipation system also includes a balancing explosion-proof valve, which is located at the end of the exhaust pipe. When the soft-pack module is in normal working condition, the balancing explosion-proof valve is used to balance the air pressure inside and outside the box. When the soft-pack module is in an uncontrolled state, the balancing explosion-proof valve is used to discharge the gas and pressure in the corresponding containment cavity to the outside of the box.

[0007] Furthermore, the battery assembly includes a housing cover plate connected to the housing. The housing cover plate is provided with multiple cavity structures, each cavity structure is set independently, and the multiple cavity structures are set one-to-one with multiple receiving cavities. Moreover, multiple leakage channels are opened on the cavity wall of each cavity structure facing the receiving cavity, and the leakage channels are connected to the corresponding receiving cavity. Each water outlet is connected to the corresponding receiving cavity through a cavity structure.

[0008] Furthermore, when the pressure value inside the exhaust pipe reaches P, the balanced explosion-proof valve is opened by the pressure inside the exhaust pipe to connect the exhaust pipe with the outside of the enclosure.

[0009] Furthermore, the cooling system includes cooling pipes with multiple outlets, which are connected to various cavity structures. At least one cooling water control valve is provided at each outlet.

[0010] Furthermore, when the pressure inside the containment cavity reaches the P value, the explosion-proof membrane is ruptured by the pressure inside the containment cavity, thereby connecting the containment cavity with the heat exhaust channel.

[0011] According to another aspect of the present invention, a vehicle is provided, including a battery assembly, the battery assembly being the aforementioned battery assembly.

[0012] According to another aspect of the present invention, a control method for an active fire extinguishing battery system is provided. The control method is the battery assembly described above. The control method includes the following steps: detecting the operating condition information of the soft-pack module, wherein the operating condition information includes at least one of the following: first pressure information in the accommodating cavity and second pressure information in the exhaust pipe; determining whether the soft-pack module is in a thermal runaway state based on the operating condition information; if so, controlling the main control valve of the cooling system and the cooling water control valve located at the outlet to open.

[0013] Furthermore, before determining whether the soft-pack module is in a state of thermal runaway based on the operating condition information, it also includes obtaining the temperature information of the housing cover plate, and determining whether the soft-pack module is in a state of thermal runaway based on the temperature information and the operating condition information.

[0014] By applying the technical solution of this invention, a heat dissipation system with a heat dissipation channel and a cooling system with a water outlet opposite to the pouch module are installed inside the casing. When the pouch module experiences thermal runaway, the heat dissipation system directs the high-temperature gas and smoke generated by the thermal runaway to the outside, while the cooling system's water outlet directly supplies water to the pouch module. This avoids the problem of thermal runaway in the pouch module triggering thermal runaway in other modules. This technical solution solves the problem of the difficulty in protecting pouch battery systems from thermal runaway, prevents thermal runaway in the pouch module from triggering thermal runaway in other modules, and stops the continued combustion of cells within the thermally runaway module. This reduces the production cost of pouch battery systems and improves their safety. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0016] Figure 1 A schematic diagram of a battery assembly according to an embodiment of the present invention is shown;

[0017] Figure 2 A schematic diagram of the structure of a first embodiment of the heat dissipation system according to the present invention is shown;

[0018] Figure 3 A schematic diagram of a second embodiment of the heat dissipation system according to the present invention is shown;

[0019] Figure 4 A schematic diagram of the structure of a first embodiment of the box cover plate according to the present invention is shown;

[0020] Figure 5 A schematic diagram of a second embodiment of the housing cover plate according to the present invention is shown;

[0021] Figure 6 A schematic diagram of an embodiment of the cooling system according to the present invention is shown;

[0022] Figure 7 A flowchart of an embodiment of the active fire extinguishing battery system according to the present invention is shown.

[0023] The above figures include the following reference numerals:

[0024] 10. Box body; 11. Receiving cavity;

[0025] 20. Heat exhaust system; 21. Heat exhaust channel; 22. Balanced explosion-proof valve; 23. End plate; 24. Adapter structure; 25. Smoke exhaust pipe;

[0026] 30. Explosion-proof film;

[0027] 40. Box cover; 41. Cavity structure; 42. Leakage channel;

[0028] 50. Cooling system; 51. Cooling pipe. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0033] Combination Figures 1 to 7 As shown, an embodiment of the present invention provides a battery assembly.

[0034] Specifically, the battery assembly includes a housing 10, a heat dissipation system 20, and a cooling system 50. The housing 10 has multiple receiving cavities 11, each containing at least one soft-pack module. The heat dissipation system 20 is located within the housing 10 and has heat dissipation channels 21 with multiple conductive ends. Each conductive end corresponds to one of the multiple receiving cavities 11, and an explosion-proof membrane 30 is provided at the connection between each conductive end and the corresponding receiving cavity 11. The cooling system 50 is located within the housing 10, with its inlet connected to an external water source and multiple outlets positioned opposite the soft-pack modules.

[0035] This embodiment provides an active fire extinguishing battery system, including a directional exhaust system for thermal runaway gas and a system for efficiently preventing the spread of battery heat. When a pouch cell module experiences thermal runaway, the exhaust system 20 directionally exhausts the high-temperature gas and smoke generated by the thermal runaway, and the outlet of the cooling system 50 directly supplies water to the pouch cell module, preventing thermal runaway in the pouch cell module from triggering thermal runaway in other modules. This technical solution addresses the challenge of thermal runaway protection in pouch cell battery systems, prevents thermal runaway in the pouch cell module from triggering thermal runaway in other modules, reduces the production cost of pouch cell battery systems, and improves the safety of pouch cell battery systems.

[0036] Combination Figure 2 , Figure 3 and Figure 6 As shown, this embodiment provides a battery thermal runaway gas directional discharge system. The heat dissipation system 20 includes at least one exhaust pipe 25, which extends along the length of the housing 10. The conducting end includes an end plate 23, and there are multiple end plates 23. Each end plate 23 is connected to the exhaust pipe 25 through at least one transition structure 24. At least one explosion-proof membrane 30 is provided on each end plate 23. The end plate 23 is located in a single receiving cavity 11, or the end plate 23 is located in two adjacent receiving cavities 11. A heat dissipation channel 21 is formed in the exhaust pipe 25, the transition structure 24, and the end plate 23.

[0037] In this embodiment, the exhaust pipe 25 extends along the length of the housing 10, preventing the high-temperature gas and dust generated by thermal runaway from contacting other modules. The gas is directly discharged through the exhaust pipe 25. The exhaust pipe 25 is connected to the transition structure 24. When the gas generated by thermal runaway punctures the explosion-proof membrane 30 on the module end plate due to high pressure, the high-temperature gas is guided by the transition structure 24 to the exhaust pipe 25. The explosion-proof membrane 30 on the end plate 23 ensures that gas can only be discharged from the module to the exhaust pipe 25, preventing reverse ventilation. This solves the problem of high-temperature gas discharged from the thermal runaway module entering other modules through the exhaust pipe 25, preventing the spread of thermal runaway.

[0038] The heat dissipation system 20 also includes a balancing explosion-proof valve 22, which is located at the end of the exhaust pipe 25. When the soft-pack module is in normal working condition, the balancing explosion-proof valve 22 balances the air pressure inside and outside the housing 10. When the soft-pack module is in a runaway state, the balancing explosion-proof valve 22 discharges the gas and pressure from the corresponding receiving cavity 11 outside the housing 10. This embodiment specifically describes the case where balancing explosion-proof valves 22 are installed at both ends of the exhaust pipe 25. A total of four balancing explosion-proof valves are installed. When the soft-pack module is working normally, the balancing explosion-proof valve 22 balances the air pressure inside and outside the soft-pack module. In the event of thermal runaway, the balancing explosion-proof valve 22 releases gas and pressure.

[0039] Combination Figure 1 and Figure 4 As shown, the battery assembly includes a housing cover 40, which is connected to the housing 10. The housing cover 40 has multiple cavity structures 41, each independently arranged, and each cavity structure 41 corresponds one-to-one with a multiple receiving cavity 11 (in conjunction with...). Figure 5 As shown), and each cavity structure 41 has multiple leakage channels 42 on the cavity wall facing the receiving cavity 11 (in conjunction with...). Figure 4 As shown, the leakage channel 42 is connected to the corresponding receiving cavity 11, and each water outlet is connected to the corresponding receiving cavity 11 through a cavity structure 41. In this embodiment, when the battery experiences thermal runaway, cooling water is rapidly filled into the cavity structure 41 on the module from the vehicle and sprayed directly from the leakage channel 42 on the module into the soft-pack module inside the receiving cavity 11, successfully preventing the cells inside the soft-pack module from continuing to burn.

[0040] When the pressure inside the exhaust pipe 25 reaches P2, the balanced explosion-proof valve 22 is opened by the pressure inside the exhaust pipe 25, allowing the exhaust pipe 25 to connect with the outside of the housing 10. The high-temperature gas and dust generated by thermal runaway are directly discharged through the exhaust pipe 25 because they do not come into contact with other modules, which can reduce the amount of safety protection materials in the module design and reduce production costs.

[0041] Combination Figures 1 to 6 Another embodiment of the present invention provides a system for efficiently preventing the spread of battery heat, wherein the cooling system 50 includes a cooling pipe 51, the cooling pipe 51 has multiple water outlets, the cooling pipe 51 is connected to each cavity structure 41 through the water outlets, and at least one cooling water control valve is provided at each water outlet.

[0042] Specifically, the inlet connector connects the cooling pipe 51 to the main cooling water control valve (not shown). The main cooling water control valve is located between the inlet connector and the cooling pipe 51 and is used to control the flow of cooling water into the cooling pipe 51. The cover plate cooling water control valve (not shown) is located between the housing cover plate 40 and the cooling pipe 51, and the main cooling water control valve and the cover plate cooling water control valve are connected by the cooling pipe 51. When the soft-pack module is working normally, the main cooling water control valve and the cover cooling water control valve are closed. That is, the cooling pipe 51, cavity structure 41, leakage channel 42 and box cover 40 are all in a waterless state to prevent cooling water from leaking into the soft-pack module. When the module experiences thermal runaway, the gas pressure in the exhaust pipe 25 increases continuously. The gas breaks through the box balance explosion-proof valve 22 and is discharged directionally from the box 10. The battery management system (BMS) (not shown) receives an abnormal signal from the cover temperature sensor (not shown) and actively controls the opening of the main cooling water control valve and the cover cooling water control valve. Cooling water quickly enters the cooling pipe 51 and is directed into the cavity structure 41 on the module that has experienced thermal runaway. It is then sprayed directly onto the battery cell from the leakage channel 42, successfully preventing the battery cell in the soft-pack module from continuing to burn.

[0043] Furthermore, when the pressure value inside the receiving cavity 11 reaches the value P1, the explosion-proof membrane 30 is ruptured by the pressure inside the receiving cavity 11, thereby connecting the receiving cavity 11 with the heat dissipation channel 21. In this embodiment, when the soft-pack battery experiences thermal runaway, the gas generated by the thermal runaway punctures the explosion-proof membrane 30 of the module end plate due to its high pressure, and is guided by the transition structure 24 to the exhaust pipe 25. Furthermore, the exhaust pipe 25 is directionally discharged outside the soft-pack module through the balanced explosion-proof valve 22, effectively preventing thermal runaway of other modules.

[0044] According to another embodiment of the present invention, an active fire extinguishing battery system design method is provided, including the above-mentioned heat dissipation system and the above-mentioned cooling system 50. Specifically, in the heat dissipation system: if the number of modules in the battery pack is N, then the number of end plates is 2N, and the number of directional explosion-proof membranes is 2N; if large modules are used, if the number of rows of modules in the battery pack is X, then the number of exhaust pipes is 2X; the exhaust pipe is set in a direction perpendicular to the module setting direction; if the module is in the X direction, the exhaust pipe is in the Y direction; if the module is in the Y direction, the exhaust pipe is in the X direction; the number of explosion-proof valves is 4X. In embodiment 50 of the cooling system: if the number of modules in the battery pack is N, then the number of end plates is 2N, and the number of cooling water control valves on the top cover of the thermal runaway module is 2N; if a large module is used, and the number of module rows in the battery pack is X, then the number of water pipes in the battery pack is 2X; the direction of the water pipes in the battery pack is perpendicular to the direction of the module setting. If the module is in the X direction, the exhaust pipe is in the Y direction; if the module is in the Y direction, the exhaust pipe is in the X direction; the number of main cooling water control valves: 1 or 2.

[0045] According to another embodiment of the present invention, a vehicle is provided, including the battery assembly described above. Specifically, the battery assembly includes a housing 10, a heat dissipation system 20, and a cooling system 50. The housing 10 has a plurality of receiving cavities 11, each receiving cavity 11 containing at least one soft-pack module; the heat dissipation system 20 is disposed within the housing 10, the heat dissipation system 20 has a heat dissipation channel 21, the heat dissipation channel 21 has a plurality of conductive ends, the plurality of conductive ends are arranged one-to-one with the plurality of receiving cavities 11, and an explosion-proof membrane 30 is provided at the connection between each conductive end and the corresponding receiving cavity 11; the cooling system 50 is disposed within the housing 10, the water inlet of the cooling system 50 is connected to an external water source, the cooling system 50 has a plurality of water outlets, the water outlets being arranged opposite to the soft-pack modules.

[0046] In this embodiment, when the pouch module experiences thermal runaway, the heat dissipation system 20 directs the high-temperature gas and dust generated by the thermal runaway to the outside, and the outlet of the cooling system 50 directly discharges water to the pouch module, thus preventing the thermal runaway of the pouch module from triggering thermal runaway in other modules. This technical solution addresses the challenge of thermal runaway protection in pouch battery systems, prevents thermal runaway in one pouch module from causing thermal runaway in other modules, reduces the production cost of pouch battery systems, and improves the safety of pouch battery systems.

[0047] According to another embodiment of the present invention, a control method for an active fire extinguishing battery system is provided. The control method is used in the battery assembly in the above embodiment. The control method includes the following steps: detecting the operating condition information of the soft-pack module, wherein the operating condition information includes at least one of the following: first pressure information in the accommodating cavity and second pressure information in the exhaust pipe; determining whether the soft-pack module is in a thermal runaway state based on the operating condition information; if so, controlling the main control valve of the cooling system and the cooling water control valve located at the outlet to open.

[0048] Before determining whether the soft-pack module is in a state of thermal runaway based on operating condition information, the method also includes acquiring the temperature information of the housing cover, and determining whether the soft-pack module is in a state of thermal runaway based on the temperature information and operating condition information. Specifically, the control method includes the following steps (in conjunction with...). Figure 7 As shown):

[0049] S01: Thermal runaway has occurred in the cells within the battery pack.

[0050] S02: When the internal air pressure of the thermal runaway soft-pack module is ≥P1, it breaks through the directional explosion-proof membrane on the end plate of the soft-pack module and enters the exhaust pipe.

[0051] S03: When the air pressure inside the exhaust pipe is ≥ P2MPa, open the balanced explosion-proof valve at the frame of the enclosure.

[0052] S04: Due to the directional explosion-proof membrane on the end plate of the soft-pack module, gas can only flow from the soft-pack module to the exhaust pipe and cannot flow in the opposite direction.

[0053] S04: The Battery Management System (BMS) receives an abnormal signal of thermal runaway from the temperature sensor at the top cover of the pouch module and actively controls the opening of the main cooling water control valve of the battery pack and the cooling water control valve of the top cover of the thermally runaway pouch module.

[0054] S05: Coolant is rapidly introduced from the vehicle into the cooling pipes inside the battery pack.

[0055] S06: Cooling water is directed into the cavity structure of the soft-pack module cover plate where thermal runaway occurs.

[0056] S07: Cooling water inside the cavity structure of the soft-pack module's top cover is sprayed directly onto the battery cell from the liquid leakage channel of the soft-pack module's top cover.

[0057] S08: Cooling water successfully prevented the cells inside the battery pack from continuing to burn.

[0058] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0059] 1. When a thermal runaway occurs in a soft-pack module, the heat dissipation system will direct the high-temperature gas and dust generated by the thermal runaway of the soft-pack module to the outside, thus preventing the thermal runaway of the soft-pack module from causing thermal runaway of other modules.

[0060] 2. Arrange heat dissipation channels inside the battery box. Since the heat dissipation channels can directionally draw out the high-temperature gas and dust generated by thermal runaway without contacting other modules, the safety protection materials in the module design can be reduced.

[0061] 3. The housing cover provided by the present invention has a cavity structure. In the event of thermal runaway, the battery management system (BMS) simultaneously opens the main cooling water control valve of the battery pack and the cooling water control valve of the thermal runaway module cover. Cooling water is rapidly filled from the whole vehicle into the cavity structure of the thermal runaway module and sprayed directly onto the battery cells from the leakage channel of the thermal runaway module cover, actively preventing the battery cells in the thermal runaway module from continuing to burn.

[0062] 4. This technical solution solves the problem of the difficulty in protecting against thermal runaway in pouch battery systems, prevents thermal runaway in pouch modules from triggering thermal runaway in other modules, reduces the production cost of pouch battery systems, and improves the safety of pouch battery systems.

[0063] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0064] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0065] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A battery assembly, characterized in that, include: The box (10) has multiple receiving cavities (11), and each receiving cavity (11) is provided with at least one soft pack module; Heat dissipation system (20), the heat dissipation system (20) is installed in the box (10), the heat dissipation system (20) has heat dissipation channel (21), the heat dissipation channel (21) has multiple conductive ends, the multiple conductive ends are arranged one-to-one with the multiple receiving cavities (11), and each conductive end is provided with an explosion-proof membrane (30) at the connection between the corresponding receiving cavity (11). Cooling system (50), the cooling system (50) is installed inside the housing (10), the water inlet of the cooling system (50) is connected to an external water source, the cooling system (50) has multiple water outlets, the water outlets are arranged opposite to the soft package module; The heat dissipation system (20) includes at least one exhaust pipe (25), which extends along the length of the housing (10). The conductive end includes an end plate (23), which is multiple. Each end plate (23) is connected to the exhaust pipe (25) through at least one transition structure (24). Each end plate (23) is provided with at least one explosion-proof membrane (30). The end plate (23) is located in a single receiving cavity (11), or the end plate (23) is located in two adjacent receiving cavities (11). The heat dissipation channel (21) is formed in the exhaust pipe (25), the transition structure (24), and the end plate (23). The heat dissipation system (20) also includes a balanced explosion-proof valve (22), which is located at the end of the exhaust pipe (25). When the soft-pack module is in normal working condition, the balanced explosion-proof valve (22) is used to balance the air pressure inside and outside the housing (10). When the soft-pack module is in an out-of-control state, the balanced explosion-proof valve (22) is used to discharge the gas and pressure in the corresponding accommodating cavity (11) to the outside of the housing (10).

2. The battery assembly according to any one of claims 1, characterized in that, The battery assembly includes: The box cover plate (40) is connected to the box body (10). The box cover plate (40) is provided with multiple cavity structures (41). Each cavity structure (41) is independently provided. The multiple cavity structures (41) are provided in a one-to-one correspondence with multiple receiving cavities (11). Multiple leakage channels (42) are opened on the cavity wall of each cavity structure (41) facing the receiving cavity (11). The leakage channels (42) are connected to the corresponding receiving cavity (11). Each water outlet is connected to the corresponding receiving cavity (11) through one of the cavity structures (41).

3. The battery assembly according to claim 1, characterized in that, When the pressure value inside the exhaust pipe (25) reaches P2, the balanced explosion-proof valve (22) is opened by the pressure inside the exhaust pipe (25) so that the exhaust pipe (25) is connected to the outside of the box (10).

4. The battery assembly according to claim 2, characterized in that, The cooling system (50) includes: The cooling pipe (51) has multiple outlets and is connected to each cavity structure (41) through the outlets. At least one cooling water control valve is provided at each outlet.

5. The battery assembly according to claim 1, characterized in that, When the pressure value inside the containment cavity (11) reaches the value P1, the explosion-proof membrane (30) is ruptured by the pressure inside the containment cavity (11) so that the containment cavity (11) is connected to the heat dissipation channel (21).

6. A vehicle comprising a battery assembly, characterized in that, The battery assembly is the battery assembly according to any one of claims 1 to 5.

7. A control method for an active fire extinguishing battery system based on the battery assembly according to any one of claims 1 to 5, the control method being used to control the battery assembly according to any one of claims 1 to 5, characterized in that, The control method includes the following steps: The working condition information of the soft-pack module is detected, wherein the working condition information includes at least one of the following: the first pressure information in the receiving cavity and the second pressure information in the exhaust pipe (25); Based on the operating condition information, determine whether the soft-pack module is in a state of thermal runaway; If so, the main control valve of the cooling system (50) and the cooling water control valve located at the outlet are opened.

8. The control method according to claim 7, characterized in that, Before determining whether the soft-pack module is in a state of thermal runaway based on the aforementioned operating condition information, the method further includes: The temperature information of the housing cover is obtained, and the soft-pack module is determined to be in a thermal runaway state based on the temperature information and the operating condition information.

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