A structure and battery for reducing the risk of thermal runaway propagation within battery cells

Abstract

This application discloses a structure and battery for reducing the risk of thermal runaway propagation within a battery cell. The cell is disposed within the battery's assembly cavity and equipped with an explosion-proof valve. The structure includes a container located on the side of the cell where the explosion-proof valve is located. The container contains coolant, and is used to release the coolant by thermal melting when the explosion-proof valve is opened due to thermal runaway, thereby cooling the cell. This application can improve the ability of the battery cell to reduce the risk of thermal propagation under thermal runaway conditions.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a structure and battery for reducing the risk of thermal runaway propagation within battery cells. Background Technology

[0002] In the practical application of lithium battery modules, when a cell suffers physical damage or thermal runaway, it may experience an internal short circuit and eject high-temperature gases and particles. If the heat is not effectively blocked or absorbed, it can easily trigger a chain reaction of thermal runaway to adjacent cells within the module, leading to heat propagation and severely affecting the safety and stability of the battery module. To prevent such thermal runaway propagation, the industry typically places a polycarbonate sheet with electrical insulation properties above the cell module to block ejected materials and reduce the possibility of short circuits.

[0003] However, the existing polycarbonate sheet structure mainly serves as a physical barrier, and its heat capacity is limited. It cannot absorb or diffuse the large amount of heat generated by the battery cell. The heat accumulates rapidly inside the module, which can easily trigger a thermal response in the adjacent battery cell and cannot effectively suppress the heat spread process.

[0004] Therefore, improving the ability of battery cell modules to reduce the risk of thermal propagation under thermal runaway conditions has become an important research direction for the current optimization of battery module structure. Utility Model Content

[0005] One objective of this application is to provide a structure and battery that reduce the risk of thermal runaway propagation within battery cells, which aims to improve the ability of the cell module to reduce the risk of thermal runaway under thermal runaway conditions.

[0006] Firstly, to achieve the above objectives, this application provides a solution as follows: a structure for reducing the risk of thermal runaway propagation within a battery cell, wherein the cell is disposed within the battery assembly cavity, the cell is equipped with an explosion-proof valve, and the structure includes a container disposed on the side of the cell where the explosion-proof valve is disposed, the container containing coolant, the container being used to release coolant by thermal melting when the explosion-proof valve is opened due to thermal runaway of the cell, thereby cooling the cell.

[0007] Optionally, the coolant is an electronic fluorinated fluid.

[0008] Optionally, the container is made of a thermoplastic material.

[0009] Optionally, the container is made of polyfluoroalkoxyethylene.

[0010] Optionally, the top opening of the assembly cavity is sealed by a battery cover, and the container is bonded and fixed to the side of the battery cover facing the explosion-proof valve.

[0011] Optionally, a receiving groove is provided on the side of the battery cover facing the explosion-proof valve, the opening of the receiving groove faces the explosion-proof valve, and the container is placed inside the receiving groove and bonded and fixed to the inner wall of the receiving groove.

[0012] Optionally, the explosion-proof valve is disposed on the side of the battery cell facing the top opening of the assembly cavity. Multiple battery cells are arranged in the assembly cavity along the first direction. The container is elongated and extends along the first direction. The projection of the container on the plane where the explosion-proof valve is located covers the explosion-proof valve.

[0013] Optionally, the container has an internal cavity for containing coolant. The cavity includes multiple sub-cavities spaced apart along a first direction. Each sub-cavity corresponds to a battery cell. The sub-cavities are used to contain coolant, and the projection of the plane containing the explosion-proof valve of the battery cell corresponding to the sub-cavity covers the corresponding explosion-proof valve.

[0014] Optionally, the container includes a substrate and multiple isolation portions. The substrate has a continuous structure extending along a first direction. The substrate is disposed on the battery cover plate. A receiving cavity is formed inside the substrate. Multiple isolation portions are spaced apart in the receiving cavity along the first direction to separate the receiving cavity into multiple sub-cavities.

[0015] Optionally, a drainage groove is formed by recessing the outer wall of the substrate near the battery cell in a direction away from the battery cell, with the opening of the drainage groove facing the battery cell and the drainage groove extending along a first direction.

[0016] Optionally, in the direction from the middle cell to the cells at both ends, the distance between the drain groove and the inner wall of the cell gradually decreases.

[0017] Optionally, the distance between the inner wall of the drain channel and the battery cell gradually decreases in the direction from the central axis of the drain channel to the two long sides of the drain channel.

[0018] Optionally, the inner wall of the container near the battery cell is recessed in the direction of the battery cell to form a liquid outlet groove.

[0019] Optionally, the cross-sectional area of ​​the liquid outlet tank gradually decreases towards the direction of the battery cell, and the cross-section is perpendicular to the depth direction of the liquid outlet tank, with the depth direction of the liquid outlet tank facing the explosion-proof valve.

[0020] Optionally, the width of the container gradually increases towards the direction of the battery cell.

[0021] Secondly, to achieve the above objectives, this application provides a battery that includes the aforementioned structure.

[0022] The beneficial effects of this application are as follows: A container is installed on one side of the battery cell where the explosion-proof valve is located. The container contains coolant and is used to thermally melt when the explosion-proof valve opens due to thermal runaway of the battery cell, thereby releasing the coolant. Thus, when a battery cell experiences thermal runaway and the explosion-proof valve opens, high-temperature gas and substances are ejected from the valve. The temperature above the explosion-proof valve can reach over 700°C. Therefore, the container can thermally melt due to the high temperature and release the coolant, achieving rapid cooling of the thermally runaway battery cell. Compared with traditional solutions that rely solely on physical barriers created by PC sheets, this structure utilizes the phase change release mechanism of the container. When the explosion-proof valve first opens, the container absorbs a large amount of heat and thermally melts, changing from a solid to a liquid or gaseous state, thereby quickly cooling the high-temperature area inside the battery. Afterward, the coolant leaks out from the location where the container thermally melted, further absorbing the remaining heat, significantly improving the response capability to the heat emitted by the explosion-proof valve. After the coolant is released, it can quickly cover the surface of the battery cell or high-temperature areas, absorb the large amount of heat generated during the spraying process, effectively suppress the accumulation of heat inside the module, and thus reduce the risk of heat spread throughout the module. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the battery provided in the embodiments of this application;

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of the battery provided in an embodiment of this application;

[0026] Figure 3 This is provided by the embodiments of this application. Figure 2 A magnified view of a portion of region A in the middle;

[0027] Figure 4 This is a schematic cross-sectional view of the sub-cavity provided in an embodiment of this application;

[0028] Figure 5 This is a partially enlarged schematic diagram provided in an embodiment of this application for illustrating the drainage channel;

[0029] Figure 6 This is a schematic cross-sectional view of the sub-cavity provided in an embodiment of this application;

[0030] Figure 7This is a cross-sectional structural diagram of the receiving groove provided in an embodiment of this application;

[0031] Figure 8 This is a schematic diagram of the cross-sectional structure shown in the depth direction of the liquid tank, provided in an embodiment of this application.

[0032] Figure 9 This is a cross-sectional structural diagram provided in an embodiment of this application to demonstrate the width of the container.

[0033] Explanation of icon numbers:

[0034] 20. Battery cover; 21. Receptacle; 30. Battery cell; 31. Explosion-proof valve; 40. Container; 41. Receptacle cavity; 411. Sub-cavity; 42. Substrate; 421. Drainage channel; 43. Isolation section; 44. Liquid outlet channel; 50. Assembly cavity; 60. First direction; 70. Central axis of drainage channel; 80. Long side of drainage channel. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0036] Please see Figures 1 to 3 as well as Figure 7 As shown, Figure 1 This is a schematic diagram of the overall structure of the battery provided in the embodiments of this application. Figure 2 This is a schematic diagram of the cross-sectional structure of the battery provided in an embodiment of this application. Figure 3 This is provided by the embodiments of this application. Figure 2 A magnified view of a portion of region A in the middle; Figure 7 This is a schematic diagram of the cross-sectional structure of the liquid tank 44 provided in an embodiment of this application.

[0037] This application provides a battery including a structure for reducing the risk of thermal runaway propagation in a battery cell 30. The battery cell 30 is disposed within a battery assembly cavity 50 and is equipped with an explosion-proof valve 31.

[0038] Specifically, the structure includes a container 40, which is disposed on one side of the battery cell 30 with the explosion-proof valve 31. The container 40 contains coolant and is used to release coolant to cool the battery cell 30 when the battery cell 30 thermally runs away and opens the explosion-proof valve 31.

[0039] In practical applications, when a cell 30 experiences thermal runaway and the explosion-proof valve 31 opens, high-temperature gases and substances are ejected from the valve 31, with temperatures above the valve reaching over 700°C. By placing a container 40 on the side of the cell 30 where the explosion-proof valve 31 is located, and pre-filling the container 40 with coolant, when the cell 30 experiences thermal runaway and the explosion-proof valve 31 opens, the container 40 can undergo thermal melting due to the high temperature and release the coolant, achieving rapid cooling of the thermally runaway cell 30. Compared to traditional solutions that rely solely on physical barriers made of polycarbonate sheets, this structure utilizes the phase change release mechanism of the container 40. When the explosion-proof valve 31 first opens, the container 40 absorbs a large amount of heat and undergoes thermal melting, transforming from a solid to a liquid or gaseous state, thus quickly cooling the high-temperature area inside the battery. Subsequently, the coolant leaks out from the location where the container 40 underwent thermal melting, further absorbing the remaining heat, significantly improving the response capability to the heat emitted by the explosion-proof valve 31. After the coolant is released, it can quickly cover the surface of the battery cell 30 or the high-temperature area, absorb the large amount of heat generated during the ejection process, effectively suppress the accumulation of heat inside the module, and thus reduce the risk of heat spread throughout the module.

[0040] In this embodiment, the coolant is an electronic fluorinated liquid. In other embodiments, the coolant can be perfluorohexanone, methyl silicone oil, or a water-based coolant with added electrical insulating additives, as long as it meets the characteristics of high specific heat capacity, good thermal stability, excellent electrical insulation, and no corrosion to the battery cell 30 material. The container 40 is made of a heat-melting material. The material of the container 40 is polyfluoroalkoxyethylene. In other embodiments, the material of the container 40 can be fluorinated ethylene propylene, polyvinylidene fluoride, or ethylene-tetrafluoroethylene copolymer, etc., which have heat-melting release characteristics.

[0041] In one embodiment, see Figure 3 The top opening of the assembly cavity 50 is sealed by the battery cover plate 20, and the container 40 is glued and fixed to the side of the battery cover plate 20 facing the explosion-proof valve 31.

[0042] In practical applications, by bonding and fixing the container 40 to the side of the battery cover 20 facing the explosion-proof valve 31, it can be ensured that the container 40 is always aligned with the ejection direction during the thermal runaway of the battery cell 30, thereby improving the timeliness and effectiveness of coolant release and avoiding problems such as coolant deviation and failure to cover the heat source.

[0043] Further, see Figure 3 and Figure 7 The battery cover 20 has a receiving groove 21 on the side facing the explosion-proof valve 31. The opening of the receiving groove 21 faces the explosion-proof valve 31. The container 40 is placed inside the receiving groove 21 and is bonded and fixed to the inner wall of the receiving groove 21.

[0044] In practical applications, a receiving groove 21 with an opening facing the explosion-proof valve 31 is provided on the side of the battery cover 20 facing the explosion-proof valve 31. The container 40 is placed in the receiving groove 21 and bonded to its inner wall, so that the container 40 achieves precise spatial positioning and structural fitting, effectively preventing the container 40 from loosening, shifting, or even falling off due to external impact or thermal expansion. The structure of the receiving groove 21 further improves the stability and positioning accuracy of the container 40 arrangement, ensuring that the release direction of the coolant is consistent with the spray direction of the battery cell 30, improving cooling efficiency and response time, thereby enhancing the active suppression capability against the spread of thermal runaway.

[0045] In one embodiment, see Figure 2 and Figure 3 The explosion-proof valve 31 is disposed on the side of the battery cell 30 facing the top opening of the assembly cavity 50. Multiple battery cells 30 are arranged in the assembly cavity 50 along the first direction 60. The container 40 is elongated and extends along the first direction 60. The projection of the container 40 on the plane where the explosion-proof valve 31 is located covers the explosion-proof valve 31.

[0046] In practical applications, multiple battery cells 30 are arranged along a first direction 60, and the container 40 is designed as a long strip extending along this direction. This allows a single container 40 to cover multiple explosion-proof valve 31 locations, thereby simplifying the structural layout, reducing the number of components, and improving space utilization efficiency. Simultaneously, by ensuring that the projection of the container 40 onto the plane containing the explosion-proof valves 31 covers all the explosion-proof valves 31, it is ensured that when any battery cell 30 experiences thermal runaway and opens the explosion-proof valve 31, the container 40 can immediately respond and release coolant under the influence of the emitted heat. This achieves precise cooling intervention against the thermal runaway source, improving the overall module's response efficiency and safety protection capabilities against the risk of thermal propagation.

[0047] Optionally, see Figure 4 The container 40 has a receiving cavity 41 inside, in which coolant is contained. The receiving cavity 41 includes a plurality of sub-cavities 411 spaced apart along the first direction 60. The plurality of sub-cavities 411 correspond one-to-one with a plurality of explosion-proof valves 31. The sub-cavities 411 are used to contain coolant. The projection of the plane on which the explosion-proof valve 31 of the corresponding cell 30 is located covers the corresponding explosion-proof valve 31.

[0048] In practical applications, multiple sub-cavities 411 are arranged at intervals along the first direction 60 inside the container 40, so that each sub-cavity 411 corresponds one-to-one with a corresponding battery cell 30 and contains coolant. This helps to precisely manage the coolant by zone, avoiding the release of all coolant in the entire containing cavity 41 in the event of thermal runaway in a single area, which would waste resources or affect the thermal management of adjacent battery cells 30. By ensuring that the projection of each sub-cavity 411 exactly covers the explosion-proof valve 31 of its corresponding battery cell 30, it is ensured that when a battery cell 30 experiences thermal runaway and triggers the explosion-proof valve 31 to erupt, the corresponding sub-cavity 411 will first melt and release the coolant, achieving a local response and precise cooling control strategy. This structure improves the response accuracy and efficiency of the cooling system, while reducing the risk of non-faulty battery cells 30 being mistakenly triggered to cool, thereby further suppressing the occurrence of heat spread and enhancing the overall safety and reliability of the system's thermal management.

[0049] Optionally, refer to Figure 4 The container 40 includes a base 42 and a plurality of isolation portions 43. The base 42 has a continuous structure extending along a first direction 60. The base 42 is disposed on the battery cover plate 20. A receiving cavity 41 is formed inside the base 42. The plurality of isolation portions 43 are spaced apart in the receiving cavity 41 along the first direction 60 to separate the receiving cavity 41 to form a plurality of sub-cavities 411.

[0050] In practical applications, by setting multiple isolation sections 43 spaced apart along the first direction 60 inside the container 40, the overall receiving cavity 41 inside the substrate 42 is divided into multiple sub-cavities 411. This not only achieves independent partitioned storage of the coolant but also improves the sealing and stability of each sub-cavity 411. This structure ensures the local independence of the cooling response, allowing the cooling medium to be released only when needed, improving the utilization rate of cooling resources, further enhancing the accuracy of thermal runaway suppression and the controllability of the system cooling mechanism, and significantly improving the safety and reliability of the battery module under extreme operating conditions.

[0051] When a single cell 30 experiences thermal runaway, the substrate 42 above the cell 30 melts and releases the coolant in the corresponding sub-cavity 411 to cool the cell 30 and the space above it. If the cooling is insufficient, the remaining high-temperature gas will cause the substrate 42 or isolation part 43 corresponding to the adjacent sub-cavity 411 to melt, thereby causing the coolant in the adjacent sub-cavity 411 to flow out and continue to cool the high-temperature area and the thermally runaway cell 30. This reduces the possibility that if a cell 30 experiences thermal runaway and all the coolant in the receiving cavity 41 is used up, there will be no coolant available when other cells 30 experience thermal runaway again.

[0052] Optionally, refer to Figure 5 and Figure 6The outer wall of the substrate 42 near the cell 30 is recessed in a direction away from the cell 30 to form a drainage groove 421. The opening of the drainage groove 421 faces the cell 30 and the drainage groove 421 extends along the first direction 60.

[0053] In practical applications, a drainage groove 421 is provided on the side of the substrate 42 near the outer wall of the cell 30. The drainage groove 421 is recessed away from the cell 30 and its opening faces the cell 30, which can form a clear flow path during the flow process after the coolant is released. This structure utilizes the containing and guiding function of the drainage groove 421 to allow the coolant to quickly gather and be guided to the surface of the cell 30 or the adjacent area at the moment of release, enhancing the contact efficiency with the heat source. Furthermore, when the explosion-proof valve 31 is opened, the high-temperature gas ejected by the explosion-proof valve 31 can move along the drainage groove 421, thereby contacting the substrate 42 corresponding to the adjacent sub-cavities 411 in sequence, reducing the possibility that the high-temperature gas cannot melt the substrate 42 or the isolation part 43 in time due to irregular escape.

[0054] Optionally, refer to Figure 5 and Figure 6 In the direction of the middle cell 30 toward the two end cells 30, the distance between the drain groove 421 and the inner wall of the cell 30 gradually decreases.

[0055] In practical applications, the arc-shaped bottom of the channel facilitates the formation of a stable and uniform liquid flow channel, allowing the coolant to flow smoothly after release and be effectively guided along the guide channel 421 to the surface of the cell 30 and its adjacent areas. The gradually decreasing spacing design further enhances the collection and concentrated cooling effect of the coolant, improves the uniformity and efficiency of the contact between the liquid and the heat source, and enhances the overall cooling effect. If the distance from the inner wall of the guide channel 421 to the cell 30 is equal, it is not conducive to the flow of coolant to other locations.

[0056] Optionally, refer to Figure 5 In the direction from the central axis 70 of the drainage channel to the two long sides of the drainage channel 421, the distance from the inner wall of the drainage channel 421 to the battery cell 30 gradually decreases.

[0057] In practical applications, the central axis 70 of the drainage channel represents the direction of the drainage channel 421. In this embodiment, it is an arc with its opening facing the cell 30, with both long sides parallel to the central axis of the drainage channel 421 and following the same trajectory. The gradually decreasing lateral spacing of the drainage channels 421 creates a confluence-like effect, which helps to guide high-temperature gas more concentratedly and evenly along the drainage channels 421 to the hot-melt material of the substrate 42, improving the contact efficiency between the gas and the hot-melt material, promoting the rapid heating and melting of the substrate 42, and thus releasing the coolant in time to control thermal runaway. This design optimizes the spatial distribution of gas and liquid flow within the drainage channel 421, reduces dead zones and stagnant areas, enhances the dual control of high-temperature gas and ejected coolant, and improves the overall structure's response speed and suppression capability against thermal runaway of the cell 30.

[0058] In one embodiment, reference is made to Figure 7 The inner wall of the container 40 near the battery cell 30 is recessed in the direction of the battery cell 30 to form a liquid outlet groove 44.

[0059] In practical applications, a liquid outlet groove 44 is provided on the inner wall of the container 40 near the cell 30. After the part of the liquid outlet groove 44 that is sealed by the substrate 42 is partially melted by heat, one end of the liquid outlet groove 44 is connected to the assembly cavity 50, thereby forming a clear liquid outflow channel during the release of coolant. This allows the released coolant to flow out of the sub-cavity 411 in an orderly manner through the liquid outflow channel formed by the liquid outlet groove 44, thereby affecting the flow direction of the coolant and significantly improving the contact efficiency between the coolant and the cell 30.

[0060] Optionally, refer to Figure 7 and Figure 8 The cross-sectional area of ​​the liquid outlet 44 gradually decreases towards the direction closer to the battery cell 30. The cross-section is perpendicular to the depth direction of the liquid outlet 44, and the depth direction of the liquid outlet 44 is towards the explosion-proof valve 31.

[0061] In practical applications, by setting the outlet tank 44 to a structure with a gradually decreasing cross-sectional area towards the battery cell 30, a converging flow channel can be formed during the coolant release process, effectively improving the flow velocity and directional stability of the liquid. This structure allows the coolant to be guided by the outlet tank 44 as it flows from inside the container 40 outwards, gradually converging and accelerating, and concentratedly released towards the direction of the explosion-proof valve 31, causing the coolant to be sprayed to the target area at a higher speed and a more concentrated path.

[0062] In one embodiment, reference is made to Figure 9 The width of container 40 gradually increases towards the direction of the battery cell 30.

[0063] In practical applications, the width gradually increases towards the battery cell 30, resulting in a larger surface area of ​​the container 40's sidewall facing the battery cell 30. After the explosion-proof valve 31 releases heat, the heat energy is more easily concentrated and conducted to the wedge-shaped area of ​​the container 40 material, thereby triggering the thermal melting reaction in that area more quickly and achieving timely release of the coolant. On the other hand, the expansion of the container 40's shape near the battery cell 30 helps the released coolant to more evenly cover the surface of the battery cell 30 or the gap area between multiple battery cells 30, increasing the liquid coverage area and improving the heat exchange contact efficiency with the heat source.

[0064] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0065] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0066] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0067] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A structure for reducing the risk of thermal runaway propagation within a battery cell, characterized in that, The battery cell is disposed within the assembly cavity of the battery. The battery cell is equipped with an explosion-proof valve. The structure includes a container disposed on the side of the battery cell where the explosion-proof valve is disposed. The container contains coolant. The container is used to release the coolant by thermal melting when the battery cell thermally runs away and opens the explosion-proof valve, thereby cooling the battery cell.

2. The structure according to claim 1, characterized in that, The coolant is an electronic fluorinated liquid.

3. The structure according to claim 1, characterized in that, The container is made of a thermoplastic material.

4. The structure according to claim 1, characterized in that, The container is made of polyfluoroalkoxyethylene.

5. The structure according to claim 1, characterized in that, The top opening of the assembly cavity is sealed by a battery cover, and the container is glued and fixed to the side of the battery cover facing the explosion-proof valve.

6. The structure according to claim 5, characterized in that, The battery cover has a receiving groove on the side facing the explosion-proof valve, the opening of the receiving groove faces the explosion-proof valve, and the container is disposed inside the receiving groove and is bonded and fixed to the inner wall of the receiving groove.

7. The structure according to any one of claims 1 to 6, characterized in that, The explosion-proof valve is disposed on the side of the battery cell facing the top opening of the assembly cavity. Multiple battery cells are arranged in the assembly cavity along a first direction. The container is elongated and extends along the first direction. The projection of the container on the plane where the explosion-proof valve is located covers the explosion-proof valve.

8. The structure according to claim 7, characterized in that, The container has a cavity inside, in which the coolant is contained. The cavity includes a plurality of sub-cavities spaced apart along the first direction. Each sub-cavity corresponds to a plurality of battery cells. The sub-cavities are used to contain the coolant. The projection of the plane containing the explosion-proof valve of the battery cell corresponding to the sub-cavity covers the corresponding explosion-proof valve.

9. The structure according to claim 8, characterized in that, The container includes a base and a plurality of isolation portions. The base has a continuous structure extending along the first direction. The base is disposed on the battery cover plate. A receiving cavity is formed inside the base. The plurality of isolation portions are spaced apart in the receiving cavity along the first direction to separate the receiving cavity to form a plurality of sub-cavities.

10. The structure according to claim 9, characterized in that, The outer wall of the substrate near the battery cell is recessed in a direction away from the battery cell to form a drainage groove, the opening of the drainage groove faces the battery cell, and the drainage groove extends along the first direction.

11. The structure according to claim 10, characterized in that, In the direction from the middle cell to the two ends of the cell, the distance between the drain groove and the inner wall of the cell gradually decreases.

12. The structure according to claim 10, characterized in that, Along the central axis of the drainage channel, the distance from the inner wall of the drainage channel to the battery cell gradually decreases in the direction of the two long sides of the drainage channel.

13. The structure according to claim 9, characterized in that, The container has a liquid outlet groove formed by a recess on the inner wall near the battery cell.

14. The structure according to claim 13, characterized in that, The cross-sectional area of ​​the liquid outlet groove gradually decreases towards the direction of the battery cell, and the cross-section is perpendicular to the depth direction of the liquid outlet groove, which is oriented towards the explosion-proof valve.

15. The structure according to claim 9, characterized in that, The width of the container gradually increases towards the battery cell.

16. A battery, characterized in that, Includes the structure according to any one of claims 1 to 15.

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