Structure for reducing thermal runaway spreading risk of battery cell in battery and battery

Abstract

The invention discloses a structure for reducing the thermal runaway spreading risk of a battery cell in a battery and the battery, the battery cell is arranged in an assembly cavity of the battery, the battery cell is provided with an anti-explosion valve, the structure comprises a container, the container is arranged on one side, provided with the anti-explosion valve, of the battery cell, and cooling liquid is contained in the container; and the container is used for generating thermal melting when the battery cell is in thermal runaway and the anti-explosion valve is opened, so that the cooling liquid is released to cool the battery cell. According to the invention, the capability of reducing the heat spreading risk of the battery cell under the thermal runaway condition can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a structure and a battery that reduce the risk of thermal runaway spreading in battery cells. Background Art

[0002] In the actual use of lithium battery modules, when a cell suffers physical damage or thermal runaway, it may cause an internal short circuit and emit high-temperature gases and particulate matter. If the heat is not effectively blocked or absorbed, it can easily trigger a chain reaction of thermal runaway in adjacent cells within the module, causing heat spread and seriously affecting the safety and stability of the battery module. To prevent the spread of this thermal runaway, the industry typically places an electrically insulating polycarbonate sheet above the cell module to block the ejected material and reduce the possibility of short circuits.

[0003] However, the existing polycarbonate sheet structure mainly plays a physical isolation role. Its own heat capacity is limited and it cannot absorb or diffuse the large amount of heat generated by the battery cell eruption. The heat accumulates rapidly inside the module and is still likely to trigger a thermal response in adjacent battery cells, which cannot effectively suppress the heat spread process.

[0004] Therefore, how to improve the ability of battery cell modules to reduce the risk of heat spread in the event of thermal runaway has become an important research direction for current battery module structure optimization. Summary of the Invention

[0005] One purpose of the present application is to provide a structure and a battery that reduce the risk of thermal runaway propagation of battery cells, which aims to enhance the ability of the battery cell module to reduce the risk of thermal propagation in the event of thermal runaway.

[0006] In the first aspect, in order to achieve the above-mentioned purpose, the present application provides a solution: a structure for reducing the risk of thermal runaway spreading of battery cells in a battery, the battery cells are arranged in the assembly cavity of the battery, the battery cells are equipped with explosion-proof valves, the structure includes a container, the container is arranged on the side of the battery cell equipped with the explosion-proof valve, the container contains coolant, and the container is used to melt thermally when the explosion-proof valve is opened due to thermal runaway of the battery cell, thereby releasing coolant to cool the battery cell.

[0007] Optionally, the coolant is electronic fluorinated liquid.

[0008] Optionally, the container is made of hot-melt material.

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

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

[0011] Optionally, a receiving groove is provided on a 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 arranged inside the receiving groove and bonded and fixed to the inner wall of the receiving groove.

[0012] Optionally, the explosion-proof valve is arranged 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 long and extends along the first direction, and the projection of the container on the plane where the explosion-proof valve is located covers the explosion-proof valve.

[0013] Optionally, a accommodating cavity is formed inside the container, and the coolant is accommodated in the accommodating cavity. The accommodating cavity includes a plurality of sub-cavities arranged at intervals along a first direction, and the plurality of sub-cavities correspond one-to-one to the plurality of battery cells. The sub-cavity is used to accommodate the coolant, and the projection of the plane where the explosion-proof valve of the battery cell corresponding to the sub-cavity is located covers the corresponding explosion-proof valve.

[0014] Optionally, the container includes a base and multiple isolation parts, the base is a continuous structure extending along the first direction, the base is arranged on the battery cover, a accommodating cavity is formed inside the base, and the multiple isolation parts are arranged in the accommodating cavity at intervals along the first direction to separate the accommodating cavity to form multiple sub-cavities.

[0015] Optionally, an outer side wall of the base body close to the battery core is recessed in a direction away from the battery core to form a drainage groove, the opening of the drainage groove faces the battery core, and the drainage groove extends along the first direction.

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

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

[0018] Optionally, an inner side wall of the container close to the battery core is recessed toward the battery core to form a liquid outlet groove.

[0019] Optionally, the cross-sectional area of the liquid outlet groove gradually decreases toward the direction approaching the battery core, the cross-sectional area is perpendicular to the depth direction of the liquid outlet groove, and the depth direction of the liquid outlet groove faces the explosion-proof valve.

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

[0021] In a second aspect, to achieve the above-mentioned purpose, the present application provides a solution which is a battery including the above-mentioned structure.

[0022] The beneficial effects of this application are as follows: A container is provided on one side of the battery cell where the explosion-proof valve is located. The container contains coolant, and the container is designed to 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 gases and substances are ejected from the explosion-proof valve. The temperature above the explosion-proof valve can reach over 700°C. As a result, the container can melt due to the high temperature and release coolant, achieving rapid cooling of the thermally runaway battery cell. Compared to traditional solutions that rely solely on physical isolation of PC sheets, this structure utilizes the phase change release mechanism of the container. When the explosion-proof valve is just opened, the container can absorb a large amount of heat and melt, transforming from solid to liquid or gas, thereby quickly cooling the high-temperature area within the battery. The coolant then leaks out from the location where the container melts, further absorbing the remaining heat, significantly improving the response capability to the heat ejected by the explosion-proof valve. After being released, the coolant can quickly cover the surface of the battery cell or high-temperature area, absorbing the large amount of heat generated during the eruption process, effectively inhibiting the accumulation of heat inside the module, thereby reducing the risk of heat spread in the entire module. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 Schematic diagram of the overall structure of the battery provided in the embodiment of the present application;

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

[0026] Figure 3 This embodiment of the present application provides Figure 2 A partial enlarged schematic diagram of area A in the middle;

[0027] Figure 4 is a schematic diagram of a cross-sectional structure for illustrating a sub-cavity provided in an embodiment of the present application;

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

[0029] Figure 6 is a schematic diagram of a cross-sectional structure for illustrating a sub-cavity provided in an embodiment of the present application;

[0030] Figure 7is a schematic diagram of a cross-sectional structure of a receiving tank provided in an embodiment of the present application;

[0031] Figure 8 is a schematic diagram of a cross-sectional structure showing the depth direction of a liquid tank provided in an embodiment of the present application;

[0032] Figure 9 It is a schematic diagram of a cross-sectional structure for showing the width of a container provided in an embodiment of the present application.

[0033] Description of Figure Numbers:

[0034] 20. Battery cover; 21. Accommodation groove; 30. Battery cell; 31. Explosion-proof valve; 40. Container; 41. Accommodation chamber; 411. Sub-chamber; 42. Base; 421. Drainage groove; 43. Isolation portion; 44. Liquid outlet groove; 50. Assembly cavity; 60. First direction; 70. Central axis of the drainage groove; 80. Long side of the drainage groove. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] See also Figures 1 to 3 as well as Figure 7 As shown, Figure 1 is a schematic diagram of the overall structure of the battery provided in the embodiment of the present application, Figure 2 This is a schematic diagram of the cross-sectional structure of the battery provided in the embodiment of the present application. Figure 3 This embodiment of the present application provides Figure 2 A partial enlarged schematic diagram of area A in the middle; Figure 7 It is a schematic diagram of the cross-sectional structure of the liquid tank 44 provided in an embodiment of the present application.

[0037] The embodiment of the present application provides a battery, including a structure for reducing the risk of thermal runaway spreading of a battery cell 30 in the battery. The battery cell 30 is arranged in an assembly cavity 50 of the battery, and the battery cell 30 is equipped with an explosion-proof valve 31.

[0038] Specifically, the structure includes a container 40, which is arranged on one side of the battery cell 30 where the explosion-proof valve 31 is configured. The container 40 contains coolant. The container 40 is used to melt thermally when the battery cell 30 opens the explosion-proof valve 31 due to thermal runaway, thereby releasing coolant to cool the battery cell 30.

[0039] In actual use, when a battery 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 31 reaching over 700°C. By placing a container 40 on the side of the battery cell 30 where the explosion-proof valve 31 is located and pre-filling the container 40 with coolant, when thermal runaway causes the valve 31 to open, the container 40 melts due to the high temperature and releases coolant, rapidly cooling the runaway battery cell 30. Compared to traditional solutions that rely solely on physical isolation using polycarbonate sheets, this structure utilizes the phase change release mechanism of the container 40. When the explosion-proof valve 31 is first opened, the container 40 absorbs a large amount of heat and undergoes thermal melting, transforming from a solid state to a liquid or gaseous state. This rapidly cools the high-temperature areas within the battery. Coolant then leaks from the melted area of the container 40, further absorbing the remaining heat, significantly improving the response to heat released by the explosion-proof valve 31. After being released, the coolant can quickly cover the surface of the battery cell 30 or the high-temperature area, absorb the large amount of heat generated during the eruption process, and effectively inhibit the accumulation of heat inside the module, thereby reducing the risk of heat spread in the entire 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 an added electrical insulating additive, as long as it has high specific heat capacity, good thermal stability, excellent electrical insulation, and is non-corrosive to the battery cell 30 material. Container 40 is made of a hot-melt material, and is made of polyfluoroalkoxyethylene. In other embodiments, container 40 can be made of a material with hot-melt release properties, such as fluorinated ethylene propylene, polyvinylidene fluoride, or ethylene-tetrafluoroethylene copolymer.

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

[0042] In actual 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 eruption direction during the thermal runaway of the battery cell 30, thereby improving the timeliness and effectiveness of the coolant release and avoiding the problem of coolant deviation and failure to cover the heat source.

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

[0044] In actual use, a receiving groove 21, opening toward 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 positioned within the receiving groove 21 and bonded to its inner wall. This allows for precise spatial positioning and structural interlocking of the container 40, effectively preventing loosening, displacement, or even falling out of the container 40 due to external impact or thermal expansion. The structure of the receiving groove 21 further enhances the stability and positioning accuracy of the container 40, ensuring that the release direction of the coolant aligns with the direction of discharge from the battery cell 30, improving cooling efficiency and responsiveness, thereby enhancing the ability to actively suppress the spread of thermal runaway.

[0045] In one embodiment, see Figure 2 and Figure 3 The explosion-proof valve 31 is arranged on the side of the battery cell 30 facing the top opening of the assembly cavity 50. A plurality of battery cells 30 are arranged in the assembly cavity 50 along the first direction 60. The container 40 is long 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 actual use, multiple battery cells 30 are arranged along a first direction 60, and the container 40 is designed as an elongated strip extending along this direction. This allows a single container 40 to cover the locations of multiple explosion-proof valves 31, thereby simplifying the structural layout, reducing the number of components, and improving space utilization efficiency. Furthermore, by ensuring that the projection of the container 40 on the plane where the explosion-proof valves 31 are located covers all explosion-proof valves 31, if any battery cell 30 experiences thermal runaway and the explosion-proof valve 31 is opened, the container 40 can immediately respond to the heat and release coolant, achieving precise cooling intervention at the source of thermal runaway, improving the overall module's response efficiency and safety protection capabilities against heat spread risks.

[0047] Optionally, see Figure 4 A accommodating chamber 41 is formed inside the container 40, and the coolant is accommodated in the accommodating chamber 41. The accommodating chamber 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 to the plurality of explosion-proof valves 31. The sub-cavity 411 is used to accommodate the coolant, and the projection of the plane where the explosion-proof valve 31 of the corresponding battery cell 30 is located covers the corresponding explosion-proof valve 31.

[0048] In actual applications, a plurality of sub-cavities 411 are provided inside the container 40, spaced apart along the first direction 60, so that each sub-cavity 411 corresponds one-to-one to a corresponding battery cell 30 and contains coolant respectively. This helps to accurately zonal management of the coolant and prevent the release of coolant in the entire containing cavity 41 when a single area experiences thermal runaway, resulting in waste of resources or affecting 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 sub-cavity 411 at the corresponding position will first melt and release the coolant, thus realizing a control strategy of local response and precise cooling. This structure improves the response accuracy and utilization efficiency of the cooling system, while reducing the risk of incorrectly triggering cooling of non-faulty battery cells 30, thereby further suppressing the occurrence of heat spread and enhancing the safety and reliability of the overall thermal management of the system.

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

[0050] In practical applications, by providing multiple partitions 43 within the container 40, spaced along the first direction 60, the overall accommodating chamber 41 within the base 42 is divided into multiple sub-chambers 411. This not only enables independent compartmentalized storage of the coolant, but also improves the sealing and stability of each sub-chamber 411. This structure ensures the local independence of the cooling response, allowing the cooling medium to be released only when needed, improving the utilization 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 battery cell 30 experiences thermal runaway, the base 42 above the battery cell 30 melts and releases the coolant in the corresponding sub-cavity 411 to cool the battery cell 30 and the space above it. If the cooling is insufficient, the remaining high-temperature gas will cause the base 42 or isolation portion 43 corresponding to the adjacent sub-cavity 411 to melt, allowing the coolant in the adjacent sub-cavity 411 to flow out and continue cooling the high-temperature area and the thermally runaway battery cell 30. This reduces the situation where the thermal runaway of one battery cell 30 causes all the coolant in the accommodating cavity 41 to be used up, and then no coolant is available when other battery cells 30 experience thermal runaway again.

[0052] Optionally, refer to Figure 5 and Figure 6The outer wall of the base 42 close to the battery core 30 is recessed toward the direction away from the battery core 30 to form a drainage groove 421 . The opening of the drainage groove 421 faces the battery core 30 , and the drainage groove 421 extends along the first direction 60 .

[0053] In actual application, a drainage groove 421 is provided on the side of the base 42 close to the outer wall of the battery cell 30, and the drainage groove 421 is recessed in the direction away from the battery cell 30 and the opening is facing the battery cell 30, so that a clear diversion path can be formed during the flow of the coolant after the release. This structure utilizes the accommodation and guiding function of the drainage groove 421 so that the coolant can be quickly collected and guided to the surface of the battery cell 30 or the adjacent area at the moment of release, thereby enhancing the contact efficiency with the heat source. And when the explosion-proof valve 31 is opened, the high-temperature gas ejected from the explosion-proof valve 31 can move along the drainage groove 421, thereby contacting the base 42 corresponding to the adjacent sub-cavity 411 in turn, reducing the situation where the high-temperature gas cannot be timely thermally melted due to irregular escape of the base 42 or the isolation portion 43.

[0054] Optionally, refer to Figure 5 and Figure 6 In the direction from the middle battery cell 30 to the battery cells 30 at both ends, the distance from the drainage groove 421 to the inner wall of the battery cell 30 gradually decreases.

[0055] In actual applications, the arc-shaped groove bottom 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 drainage groove 421 to the surface of the battery cell 30 and its adjacent areas. The gradually decreasing spacing design further enhances the collection and centralized 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 between the drainage groove 421 and the inner wall of the battery 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 groove to the two long sides of the drainage groove 421 , the distance between the drainage groove 421 and the inner wall of the battery cell 30 gradually decreases.

[0057] In actual application, the central axis 70 of the drainage groove represents the direction in which the drainage groove 421 extends. In the embodiment of the present application, it is an arc with an opening toward the battery cell 30, and both long sides are parallel to the central axis of the drainage groove 421 and have the same trajectory. The lateral spacing of the drainage grooves 421 gradually decreases to form a convergence-like effect, which helps to guide the high-temperature gas along the drainage grooves 421 to the hot-melt material of the substrate 42 in a more concentrated and uniform manner, improve the contact efficiency between the gas and the hot-melt material, and promote the rapid thermal melting of the substrate 42, thereby releasing the coolant in time to control thermal runaway. This design optimizes the spatial distribution of gas and liquid flow in the drainage grooves 421, reduces flow dead corners and stagnation areas, enhances the dual control of high-temperature gas and erupting coolant, and improves the response speed and suppression ability of the overall structure to thermal runaway of the battery cell 30.

[0058] In one embodiment, referring to Figure 7 The inner side wall of the container 40 close to the battery core 30 is recessed toward the battery core 30 to form a liquid outlet groove 44.

[0059] In actual application, a liquid outlet groove 44 is provided on the inner wall of the container 40 near the battery cell 30. When the portion of the base 42 that closes the liquid outlet groove 44 is thermally melted, one end of the liquid outlet groove 44 is connected to the assembly cavity 50, thereby forming a clear liquid outflow channel during the coolant release process, so that the released coolant can 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 battery cell 30.

[0060] Optionally, refer to Figure 7 and Figure 8 , the cross-sectional area of the liquid outlet groove 44 gradually decreases toward the direction approaching the battery core 30 , the cross-sectional area is perpendicular to the depth direction of the liquid outlet groove 44 , and the depth direction of the liquid outlet groove 44 is toward the explosion-proof valve 31 .

[0061] In practice, by configuring the outlet groove 44 with a gradually decreasing cross-sectional area toward the battery cell 30, a convergent flow path is 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 groove 44 as it flows from the interior of the container 40 through the outlet groove 44 and is released outward, gradually converging and accelerating, and then being released in a concentrated manner toward the explosion-proof valve 31, prompting the coolant to be sprayed to the target area at a higher speed and in a more concentrated path.

[0062] In one embodiment, referring to Figure 9 The width of the container 40 gradually increases toward the direction approaching the battery cell 30 .

[0063] In practice, the width gradually increases toward the battery cell 30, increasing the surface area of the container 40's sidewalls facing the battery cell 30. After the explosion-proof valve 31 releases heat, the heat energy is more easily concentrated and transferred to the wedge-shaped area of the container 40 material, thereby triggering a thermal melt reaction in this area more quickly and achieving the timely release of the coolant. Furthermore, the expansion of the container 40's shape near the battery cell 30 helps the released coolant more evenly cover the surface of the battery cell 30 or the gaps 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 in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship and movement status between the components 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 an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element through an intervening element.

[0066] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0067] The above description is only a preferred embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application description and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A structure for reducing the risk of thermal runaway spreading in battery cells, characterized in that: The battery cell is arranged in the assembly cavity of the battery, and the battery cell is equipped with an explosion-proof valve. The structure includes a container, and the container is arranged on the side of the battery cell where the explosion-proof valve is configured. The container contains coolant. The container is used to melt thermally when the battery cell opens the explosion-proof valve due to thermal runaway, thereby releasing the coolant to cool the battery cell.

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

3. The structure according to claim 1, characterized in that The container is made of hot-melt material.

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

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

6. The structure according to claim 5, characterized in that A receiving groove is formed on a side of the battery cover plate facing the explosion-proof valve, with an opening of the receiving groove facing the explosion-proof valve. 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 arranged on a side of the battery cell facing the top opening of the assembly cavity. A plurality of the battery cells are arranged in a first direction in the assembly cavity. The container is long 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 A accommodating cavity is formed inside the container, and the coolant is accommodated in the accommodating cavity. The accommodating cavity includes a plurality of sub-cavities arranged at intervals along the first direction, and the plurality of sub-cavities correspond one-to-one to the plurality of battery cells. The sub-cavity is used to accommodate the coolant, and the projection of the plane where the explosion-proof valve of the battery cell corresponding to the sub-cavity is located covers the corresponding explosion-proof valve.

9. The structure according to claim 8, characterized in that The container includes a base and multiple isolation parts. The base is a continuous structure extending along the first direction. The base is arranged on the battery cover. A accommodating cavity is formed inside the base. The multiple isolation parts are arranged in the accommodating cavity at intervals along the first direction to separate the accommodating cavity into multiple sub-cavities.

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

11. The structure according to claim 10, characterized in that In the direction from the battery core in the middle to the battery cores at the two ends, the distance between the drainage groove and the battery core gradually decreases toward the inner wall of the battery core.

12. The structure according to claim 10, characterized in that In the direction from the central axis of the drainage groove to the two long sides of the drainage groove, the distance between the drainage groove and the inner wall of the battery core gradually decreases.

13. The structure according to claim 9, characterized in that The inner side wall of the container close to the battery core is recessed toward the battery core to form a liquid outlet groove.

14. The structure according to claim 13, characterized in that The cross-sectional area of the liquid outlet groove gradually decreases toward the battery core, and the cross-sectional area is perpendicular to the depth direction of the liquid outlet groove, and the depth direction of the liquid outlet groove faces the explosion-proof valve.

15. The structure according to claim 9, characterized in that The width of the container gradually increases toward the direction approaching the battery core.

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

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