A top cover assembly with an explosion-proof sheet, a battery cell, and a battery module.

Abstract

This utility model discloses a top cover assembly with an explosion-proof plate, a battery cell, and a battery module, belonging to the field of battery technology. The top cover assembly with the explosion-proof plate includes a top cover and an explosion-proof plate; the top cover has an explosion-proof through hole; the explosion-proof plate is installed in the explosion-proof through hole and includes a fixing part, a notch, a fracture part, and a thermosensitive deformation plate. The notch is located between the fixing part and the fracture part. The thermosensitive deformation plate is located close to the notch and is used to deform upon reaching the deformation temperature, causing the notch to fracture. When both the fixing part and the fracture part have thermosensitive deformation plates, the deformation of the thermosensitive deformation plate on the fixing part and the thermosensitive deformation plate on the fracture part provides a thrust in opposite directions to the notch. This top cover assembly with the explosion-proof plate can still open the explosion-proof plate in time for directional venting and pressure relief when the internal pressure of the housing is insufficient, and can prevent the entire battery module from experiencing a chain reaction of thermal runaway.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a top cover assembly with an explosion-proof sheet, a battery cell, and a battery module. Background Technology

[0002] Currently, in battery cells, the explosion-proof valves installed on the top cover are usually triggered by the pressure inside the casing. For example, when the air pressure inside the casing reaches 0.8 MPa, the air pressure can open the explosion-proof valve to release pressure and exhaust gas in a directional manner.

[0003] However, in extreme situations where a foreign metal object accidentally pierces the cell inside the casing, causing a partial short circuit, the high-temperature gas generated by the short circuit can escape from the puncture site to the outside of the casing. This results in insufficient pressure inside the casing, preventing the explosion-proof valve from opening in time to release pressure. Consequently, the generated high-temperature gas cannot be discharged directionally from the explosion-proof valve. Especially in battery modules composed of individual battery cells, directional heat dissipation structures are usually installed at the explosion-proof valve. If the high-temperature gas from a single battery cell does not escape from the explosion-proof valve, the escaping high-temperature gas will affect other battery cells, leading to a chain reaction of thermal runaway in the entire battery module, posing a serious safety risk.

[0004] To address the above issues, there is an urgent need for a top cover assembly, battery cell, and battery module with explosion-proof features. Utility Model Content

[0005] The purpose of this invention is to provide a top cover assembly, battery cell, and battery module with an explosion-proof plate, which can quickly release pressure by opening the explosion-proof plate in time when the internal pressure of the casing is insufficient, so as to quickly vent the gas in a directional manner, and can avoid the chain thermal runaway phenomenon of the entire battery module.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A top cover assembly with an explosion-proof diaphragm, for covering the housing, includes:

[0008] Top cover, wherein the top cover is provided with an explosion-proof through hole;

[0009] An explosion-proof sheet is installed in the explosion-proof through hole. The explosion-proof sheet includes a fixing part, a notch, a fracture part, and a thermosensitive deformation sheet. The notch is located between the fixing part and the fracture part. The thermosensitive deformation sheet is provided on the fixing part and / or the fracture part. The thermosensitive deformation sheet is located close to the notch. The thermosensitive deformation sheet is used to deform after reaching the deformation temperature, causing the notch to fracture. When both the fixing part and the fracture part are provided with the thermosensitive deformation sheet, the thermosensitive deformation sheet on the fixing part and the thermosensitive deformation sheet on the fracture part deform to provide thrust to the notch in opposite directions.

[0010] As an optional solution, the thermosensitive deformation sheet is a shape memory alloy sheet.

[0011] As an optional solution, the explosion-proof sheet also includes a connecting portion, wherein the two ends of the groove are spaced apart, and the portion located between the two ends of the groove and used to connect the fixing portion and the fracture portion is the connecting portion.

[0012] As an optional solution, the thermosensitive deformation sheet includes:

[0013] The first thermal deformation sheet has a rectangular structure and faces the outside of the housing. The first end of the first thermal deformation sheet is connected to the fixing part, and the second end passes through the connecting part and extends to the crack part. The second end of the first thermal deformation sheet is located close to the groove.

[0014] As an optional solution, the thermosensitive deformation sheet includes:

[0015] The second thermal deformation sheet faces the outside of the housing. The second thermal deformation sheet includes a first part with a square structure and a second part with the same shape as the groove. The first end of the first part is connected to the fixing part, and the second end of the first part passes through the connecting part and extends to the fracture part to connect with the second part. The outer edge of the second part is disposed close to the inner side of the groove.

[0016] As an optional solution, the thermosensitive deformation sheet includes:

[0017] The third thermal deformation sheet has a long strip structure and faces the outside of the housing. The third thermal deformation sheet includes a first section, a second section and a third section connected in sequence. The fixing part is welded to the top cover. The first section is located on the top cover and the third section is connected to the crack and close to the groove.

[0018] As an optional solution, the thermosensitive deformation sheet includes:

[0019] The fourth thermal deformation sheet has an arc-shaped structure. A portion of the fixing part is welded to the top cover. The fourth thermal deformation sheet is disposed between the top cover and another portion of the fixing part, and the fourth thermal deformation sheet is disposed on the side facing outward of the housing and close to the outer ring of the groove.

[0020] As an optional solution, the thermosensitive deformation sheet includes:

[0021] The fifth thermal deformation sheet has an arc-shaped structure. A portion of the fixing part is welded to the top cover. The fifth thermal deformation sheet is disposed between the top cover and another portion of the fixing part, and the fifth thermal deformation sheet faces the inside of the housing and is disposed near the outer ring of the groove.

[0022] A battery cell includes a battery cell, a housing, and a top cover assembly with an explosion-proof sheet as described above. The battery cell is disposed inside the housing, and the top cover assembly with the explosion-proof sheet is fixed to the open end of the housing.

[0023] A battery module includes a housing and a plurality of battery cells as described above, wherein the plurality of battery cells are disposed within the housing.

[0024] The beneficial effects of this utility model are as follows:

[0025] By comprising a fixed part, a notch, a fracture part, and a thermosensitive deformation element, with the notch positioned between the fixed part and the fracture part, and the thermosensitive deformation element disposed on the fixed part and / or the fracture part, close to the notch, the thermosensitive deformation element deforms upon reaching its deformation temperature. This deformation force is applied to the area near the notch, causing the notch to fracture. Furthermore, when thermosensitive deformation elements are disposed on both the fixed part and the fracture part, the deformation of the thermosensitive deformation elements on the fixed part and the fracture part provides thrust to the notch in opposite directions, resulting in the notch being subjected to two opposing thrusts simultaneously, making it easier for the notch to fracture and allowing the entire explosion-proof disc to quickly... Rapid rupture enables directional venting. The aforementioned use of a temperature-sensitive thermostatic deflector to quickly open the entire explosion-proof diaphragm significantly reduces the probability of high-temperature gas generated by a local short circuit in the battery cell escaping from the puncture site to the outside of the casing. In other words, even when the pressure inside the casing is insufficient, the thermostatic deflector can still open the explosion-proof diaphragm in time for rapid pressure relief, allowing the high-temperature gas generated by the battery cell to be directionally discharged from the explosion-proof diaphragm. At the same time, in a battery module assembled from several battery cells, a single battery cell will not escape high-temperature gas and affect other battery cells, thereby preventing a chain reaction of thermal runaway in the entire battery module and improving the safety of the entire battery module. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the structure of the battery cell (including the second thermal deformation sheet) provided in this utility model;

[0027] Figure 2 This is a schematic diagram of the assembly structure between the explosion-proof sheet (thermal deformation sheet including the first thermal deformation sheet) and the top cover provided in this utility model. Figure 1 ;

[0028] Figure 3 This is a schematic diagram of the assembly structure between the explosion-proof sheet (thermal deformation sheet including a second thermal deformation sheet) and the top cover provided in this utility model. Figure 2 ;

[0029] Figure 4 This is a schematic diagram of the assembly structure between the explosion-proof sheet (thermal deformation sheet including a third thermal deformation sheet) and the top cover provided in this utility model. Figure 3 ;

[0030] Figure 5 This is a schematic cross-sectional view of the explosion-proof sheet (thermal deformation sheet including the fourth thermal deformation sheet) and the top cover provided in this utility model. Figure 1 ;

[0031] Figure 6 yes Figure 5 A magnified schematic diagram of the local structure at point A;

[0032] Figure 7 This is a schematic cross-sectional view of the explosion-proof sheet (thermal deformation sheet including the fifth thermal deformation sheet) and the top cover provided in this utility model. Figure 2 ;

[0033] Figure 8 yes Figure 7 A magnified schematic diagram of the structure at point B in the middle.

[0034] Explanation of reference numerals in the attached figures:

[0035] 10 - Top cover assembly with explosion-proof plate; 20 - Housing;

[0036] 1-Top cover; 11-Groove;

[0037] 2-Explosion-proof sheet; 21-Fixing part; 22-Score; 23-Fragment; 24-Connecting part;

[0038] 251-First thermosensitive deformation sheet; 252-Second thermosensitive deformation sheet; 2521-First part; 2522-Second part; 253-Third thermosensitive deformation sheet; 2531-First segment; 2532-Second segment; 2533-Third segment; 254-Fourth thermosensitive deformation sheet; 255-Fifth thermosensitive deformation sheet. Detailed Implementation

[0039] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0040] Any feature disclosed in this specification, unless specifically stated otherwise, may be replaced by other equivalent or similar features. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features. Throughout this specification, the same reference numerals indicate the same elements.

[0041] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] like Figure 1 As shown, this embodiment proposes a top cover assembly 10 with an explosion-proof sheet, a battery cell including the top cover assembly 10 with the explosion-proof sheet, and a battery module including multiple battery cells. The battery cell also includes a battery cell and a housing 20. The battery cell is disposed inside the housing 20. The top cover assembly 10 with the explosion-proof sheet is used to fix and cover the open end of the housing 20 to encapsulate the battery cell inside the housing 20. The battery module also includes a housing, and multiple battery cells are disposed inside the housing.

[0043] Specifically, the battery cell can be either a wound battery cell or a stacked battery cell. When the battery cell is a wound battery cell, one or more wound battery cells can be provided. Furthermore, the positive terminal of the battery cell is electrically connected to the positive terminal on the top cover assembly 10 with the explosion-proof sheet, and the negative terminal of the battery cell is electrically connected to the negative terminal on the top cover assembly 10 with the explosion-proof sheet.

[0044] It is worth noting that the main improvement in this embodiment lies in the specific structure of the top cover assembly 10 with the explosion-proof sheet. Here, the specific working principle of the battery cell and battery module will not be described in detail. You can refer to the working principle of the existing battery cell and battery module.

[0045] Specifically, such as Figure 1 and Figure 2As shown, the top cover assembly 10 with an explosion-proof plate includes a top cover 1 and an explosion-proof plate 2; wherein, an explosion-proof through hole is provided on the top cover 1; the explosion-proof plate 2 is installed in the explosion-proof through hole, and the explosion-proof plate 2 includes a fixing part 21, a notch 22, a fracture part 23 and a thermosensitive deformation plate. The notch 22 is located between the fixing part 21 and the fracture part 23. The fixing part 21 and / or the fracture part 23 are provided with thermosensitive deformation plates. The thermosensitive deformation plates are located close to the notch 22. The thermosensitive deformation plates are used to deform after reaching the deformation temperature, causing the notch 22 to fracture. When both the fixing part 21 and the fracture part 23 are provided with thermosensitive deformation plates, the thermosensitive deformation plates on the fixing part 21 and the thermosensitive deformation plates on the fracture part 23 deform to provide thrust to the notch 22 in opposite directions.

[0046] Compared to existing technologies, the top cover assembly 10 with an explosion-proof sheet in this embodiment changes the way the explosion-proof sheet 2 is opened. By enabling the thermosensitive deformation sheet to deform after reaching the deformation temperature, the deformation force can be applied to the position near the notch 22, causing the notch 22 to break. Furthermore, when thermosensitive deformation sheets are provided on both the fixing part 21 and the breaking part 23, the thermosensitive deformation sheets on the fixing part 21 and the breaking part 23 deform to provide thrust to the notch 22 in opposite directions. This allows the notch 22 to be subjected to two opposing thrusts simultaneously, making it easier for the notch 22 to break and enabling the entire explosion-proof sheet 2 to break quickly, achieving directional... Venting; The aforementioned use of a temperature-sensitive thermostatic deflector to quickly open the entire explosion-proof plate 2 can greatly reduce the probability of high-temperature gas generated by a local short circuit in the battery cell escaping from the puncture site to the outside of the casing 20. That is, even when the pressure inside the casing 20 is insufficient, the thermostatic deflector can still open the explosion-proof plate 2 in time to quickly release pressure, allowing the high-temperature gas generated by the battery cell to be directionally discharged from the explosion-proof plate 2. At the same time, in a battery module assembled from several battery cells, a single battery cell will not escape high-temperature gas and affect other battery cells, thereby avoiding a chain thermal runaway phenomenon in the entire battery module and improving the safety of the entire battery module.

[0047] Furthermore, the thermosensitive deformation sheet is a shape memory alloy sheet. Shape memory alloy (SMA) sheets specifically refer to sheets composed of two or more metallic elements that have a shape memory effect (SME) through thermoelastic and martensitic phase transformation and its inverse transformation. Shape memory alloys are the materials with the best shape memory performance among shape memory materials.

[0048] Specifically, the shape memory alloy sheet has at least two shapes: a first shape and a second shape. The first shape is the shape of the shape memory alloy sheet before it reaches its deformation temperature. When the shape memory alloy sheet is in the first shape, it cannot apply force to the notch 22 to open it. The second shape is the shape of the shape memory alloy sheet after it reaches its deformation temperature. When the shape memory alloy sheet is in the process of transitioning from the first shape to the second shape or when it is in the second shape, it can apply force to the notch 22 to open it.

[0049] Furthermore, such as Figure 2 As shown, the explosion-proof sheet 2 also includes a connecting part 24. The two ends of the groove 22 are spaced apart, that is, the two ends of the groove 22 are not closed. The part located between the two ends of the groove 22 and used to connect the fixing part 21 and the fracture part 23 is the connecting part 24. Specifically, the fixing part 21 and the fracture part 23 are connected through the connecting part 24.

[0050] Specifically, the thermosensitive deformation sheet is connected to the fixing part 21 / fracture part 23 / connecting part 24 by mechanical pressing or spot welding. That is, the fixing part 21, fracture part 23 and connecting part 24 are integral structures formed by processing aluminum sheets, and the thermosensitive deformation sheet and the aluminum sheet can be bonded together by mechanical pressing or spot welding.

[0051] In this embodiment, as Figure 2 As shown, the thermal deformation sheet includes a first thermal deformation sheet 251, which has a rectangular structure. The first thermal deformation sheet 251 is disposed on the side facing outside the housing 20. The first end of the first thermal deformation sheet 251 is connected to the fixing part 21, and the second end of the first thermal deformation sheet 251 passes through the connecting part 24 and extends to the crack part 23. The second end of the first thermal deformation sheet 251 is disposed near the groove 22.

[0052] Specifically, when the first thermosensitive deformation sheet 251 reaches the deformation temperature and deforms, the second end of the first thermosensitive deformation sheet 251 can apply force to the position near the notch 22 on the fractured part 23, so that the first thermosensitive deformation sheet 251 pushes the fractured part 23 downward, causing the notch 22 to break, thereby quickly opening the entire explosion-proof sheet 2.

[0053] In the second embodiment, as Figure 1 and Figure 3As shown, the thermal deformation sheet includes a second thermal deformation sheet 252, which is disposed on the side facing outward from the housing 20. The second thermal deformation sheet 252 includes a first portion 2521 with a square structure and a second portion 2522 with the same shape as the notch 22. The first end of the first portion 2521 is connected to the fixing portion 21, and the second end of the first portion 2521 passes through the connecting portion 24 and extends to the break portion 23 to connect with the second portion 2522. The outer edge of the second portion 2522 is disposed near the inner side of the notch 22. The first portion 2521 and the second portion 2522 of the second thermal deformation sheet 252 are integral structures.

[0054] By having the outer edge of the second portion 2522 of the second thermosensitive deformation sheet 252 cover the outer edge of the fracture portion 23, and by positioning the outer edge of the second portion 2522 close to the inner circle of the notch 22, when the second thermosensitive deformation sheet 252 reaches the deformation temperature and deforms, the outer edge of the second portion 2522 can apply force to the outer edge of the fracture portion 23 close to the notch 22, so that the second portion 2522 of the second thermosensitive deformation sheet 252 pushes the fracture portion 23 downward, which helps the notch 22 to break, so as to quickly open the entire explosion-proof sheet 2 for directional venting.

[0055] In the third embodiment, as Figure 4 As shown, the thermal deformation sheet includes a third thermal deformation sheet 253, which has an elongated structure and is positioned on the side facing outward from the housing 20. The third thermal deformation sheet 253 includes a first segment 2531, a second segment 2532, and a third segment 2533 connected in sequence. The fixing part 21 is welded to the top cover 1. The first segment 2531 is located on the top cover 1. The second segment 2532 passes obliquely through the fixing part 21, the connecting part 24, and the fracture part 23. The third segment 2533 is connected to the fracture part 23 and is close to the groove 22. The first segment 2531, the second segment 2532, and the third segment 2533 of the third thermal deformation sheet 253 are an integral structure. The first segment 2531 is specifically located in the groove 11 of the top cover 1, and the groove 11 is positioned opposite to the fixing part 21.

[0056] By connecting the third segment 2533 of the third thermal deformation plate 253 to the fracture portion 23 and close to the notch 22, when the third thermal deformation plate 253 reaches the deformation temperature and deforms, the third segment 2533 of the third thermal deformation plate 253 can apply force to the position of the fracture portion 23 close to the notch 22, so that the third segment 2533 of the third thermal deformation plate 253 pushes the fracture portion 23 downward, thereby pushing the notch 22 open, so as to quickly open the entire explosion-proof plate 2 for directional venting.

[0057] In the fourth embodiment, as Figure 5 and Figure 6As shown, the thermal deformation sheet includes a fourth thermal deformation sheet 254, which has an arc-shaped structure. A part of the fixing part 21 is welded to the top cover 1. The fourth thermal deformation sheet 254 is disposed between the top cover 1 and another part of the fixing part 21, and the fourth thermal deformation sheet 254 is disposed on the side facing outside the housing 20 and close to the outer ring of the groove 22.

[0058] like Figure 6 As shown, by positioning the fourth thermal deformation sheet 254 towards the outside of the housing 20 and placing it close to the outer ring of the groove 22, when the fourth thermal deformation sheet 254 reaches the deformation temperature and deforms, the top of the fourth thermal deformation sheet 254 is restricted by the top cover 1. Therefore, the fourth thermal deformation sheet 254 deforms and expands downward, causing the fourth thermal deformation sheet 254 to push the fixing part 21 downward, causing the groove 22 to crack and achieving directional exhaust.

[0059] In the fifth embodiment, as Figure 7 and Figure 8 As shown, the thermal deformation sheet includes a fifth thermal deformation sheet 255, which has an arc-shaped structure. A portion of the fixing part 21 is welded to the top cover 1. The fifth thermal deformation sheet 255 is disposed between the top cover 1 and another portion of the fixing part 21, and the fifth thermal deformation sheet 255 is disposed on the side facing the inside of the housing 20 and close to the outer ring of the groove 22.

[0060] like Figure 8 As shown, by positioning the fifth thermal deformation sheet 255 towards the inside of the housing 20 and placing it close to the outer ring of the groove 22, when the fifth thermal deformation sheet 255 reaches the deformation temperature and deforms, the bottom end of the fifth thermal deformation sheet 255 is restricted by the top cover 1. Therefore, the fifth thermal deformation sheet 255 deforms and expands upward, so that the fifth thermal deformation sheet 255 pushes the fixing part 21 upward, causing the groove 22 to crack and achieving directional exhaust.

[0061] In the sixth embodiment, the thermal deformation sheet includes the fifth thermal deformation sheet 255 mentioned above. The thermal deformation sheet also includes any one of the first thermal deformation sheet 251, the second thermal deformation sheet 252, and the third thermal deformation sheet 253 mentioned above. That is, in the sixth embodiment, two thermal deformation sheets are provided so that the fifth thermal deformation sheet 255 can push the fixing part 21 upward, while any one of the first thermal deformation sheet 251, the second thermal deformation sheet 252, and the third thermal deformation sheet 253 can push the breaking part 23 downward. This makes the upper and lower sides of the groove 22 more evenly stressed, so that the groove 22 can break more easily under the thrust in two opposite directions, and the entire explosion-proof sheet 2 can break more quickly to achieve rapid directional venting.

[0062] In the seventh embodiment, the thermal deformation sheet includes the aforementioned fourth thermal deformation sheet 254, and also includes a sixth thermal deformation sheet (not shown in the figure). The sixth thermal deformation sheet is located below the fixing part 21 and is connected to the rupture part 23 and is located near the inner circle of the notch 22. That is, in the seventh embodiment, two thermal deformation sheets are provided so that the fourth thermal deformation sheet 254 can push the fixing part 21 downward, while the sixth thermal deformation sheet pushes the rupture part 23 upward, so that the upper and lower sides of the notch 22 are subjected to more uniform force, thereby making it easier for the notch 22 to rupture under the action of the thrust in two opposite directions, so that the entire explosion-proof sheet 2 can rupture more quickly and achieve rapid directional venting.

[0063] In this embodiment, the top cover assembly 10 with an explosion-proof sheet is equipped with a thermosensitive deformation sheet made of shape memory alloy. The thermosensitive deformation sheet is highly sensitive to temperature, so that the deformation force generated by the thermosensitive deformation sheet after reaching the deformation temperature can cause the groove 22 to break quickly, thereby achieving rapid directional venting and preventing the entire battery module from experiencing a chain thermal runaway.

[0064] In this embodiment, the top cover assembly 10 with an explosion-proof sheet, by providing a first thermal deformation sheet 251, a second thermal deformation sheet 252, and a third thermal deformation sheet 253, can push the fracture portion 23 downward, causing the groove 22 to break, thereby quickly opening the entire explosion-proof sheet 2; and by providing a fourth thermal deformation sheet 254 to push the fixing portion 21 downward and a fifth thermal deformation sheet 255 to push the fixing portion 21 upward, causing the groove 22 to break quickly; moreover, the fifth thermal deformation sheet 255 can also be connected to the first thermal deformation sheet 251, Either the second thermal deformation sheet 252 or the third thermal deformation sheet 253 can be configured to cooperate with each other so as to push the fixing part 21 upward while pushing the breaking part 23 downward, thereby making it easier for the scratch 22 to break under the action of thrust in two opposite directions; and the fourth thermal deformation sheet 254 and the sixth thermal deformation sheet can also be configured to cooperate with each other so as to push the fixing part 21 downward while pushing the breaking part 23 upward, thereby making it easier for the scratch 22 to break under the action of thrust in two opposite directions.

[0065] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A top cover assembly with an explosion-proof plate for covering a housing (20), characterized in that, include: Top cover (1), wherein the top cover (1) is provided with an explosion-proof through hole; An explosion-proof sheet (2) is installed in the explosion-proof through hole. The explosion-proof sheet (2) includes a fixing part (21), a notch (22), a fracture part (23), and a thermosensitive deformation sheet. The notch (22) is located between the fixing part (21) and the fracture part (23). The thermosensitive deformation sheet is provided on the fixing part (21) and / or the fracture part (23). The thermosensitive deformation sheet is located close to the notch (22). The thermosensitive deformation sheet is used to deform after reaching the deformation temperature, causing the notch (22) to fracture. When both the fixing part (21) and the fracture part (23) are provided with the thermosensitive deformation sheet, the thermosensitive deformation sheet on the fixing part (21) and the thermosensitive deformation sheet on the fracture part (23) deform to provide a thrust to the notch (22) in opposite directions.

2. The top cover assembly with an explosion-proof sheet as described in claim 1, characterized in that, The thermosensitive deformation sheet is a shape memory alloy sheet.

3. The top cover assembly with an explosion-proof sheet as described in claim 1, characterized in that, The explosion-proof sheet (2) also includes a connecting part (24). The two ends of the groove (22) are spaced apart. The part located between the two ends of the groove (22) and used to connect the fixing part (21) and the fracture part (23) is the connecting part (24).

4. The top cover assembly with an explosion-proof sheet as described in claim 3, characterized in that, The thermosensitive deformation sheet includes: The first thermal deformation sheet (251) has a rectangular structure and faces the outside of the housing (20). The first end of the first thermal deformation sheet (251) is connected to the fixing part (21), and the second end passes through the connecting part (24) and extends to the crack part (23). The second end of the first thermal deformation sheet (251) is located close to the groove (22).

5. The top cover assembly with an explosion-proof sheet as described in claim 3, characterized in that, The thermosensitive deformation sheet includes: The second thermal deformation sheet (252) faces the outside of the housing (20). The second thermal deformation sheet (252) includes a first part (2521) with a square structure and a second part (2522) with the same shape as the groove (22). The first end of the first part (2521) is connected to the fixing part (21). The second end of the first part (2521) passes through the connecting part (24) and extends to the fracture part (23) to connect with the second part (2522). The outer edge of the second part (2522) is disposed close to the inner side of the groove (22).

6. The top cover assembly with an explosion-proof sheet as described in claim 1, characterized in that, The thermosensitive deformation sheet includes: The third thermal deformation sheet (253) has a long strip structure and faces the outside of the housing (20). The third thermal deformation sheet (253) includes a first segment (2531), a second segment (2532) and a third segment (2533) connected in sequence. The fixing part (21) is welded to the top cover (1). The first segment (2531) is provided on the top cover (1). The third segment (2533) is connected to the crack (23) and close to the groove (22).

7. The top cover assembly with an explosion-proof sheet as described in claim 1, characterized in that, The thermosensitive deformation sheet includes: The fourth thermal deformation sheet (254) has an arc-shaped structure. A part of the fixing part (21) is welded to the top cover (1). The fourth thermal deformation sheet (254) is disposed between the top cover (1) and another part of the fixing part (21). The fourth thermal deformation sheet (254) is disposed on the side facing outside the housing (20) and close to the outer ring of the groove (22).

8. The top cover assembly with an explosion-proof sheet as described in any one of claims 1-6, characterized in that, The thermosensitive deformation sheet includes: The fifth thermal deformation sheet (255) has an arc-shaped structure. A part of the fixing part (21) is welded to the top cover (1). The fifth thermal deformation sheet (255) is disposed between the top cover (1) and another part of the fixing part (21). The fifth thermal deformation sheet (255) is disposed on one side facing the inside of the housing (20) and close to the outer ring of the groove (22).

9. A single battery cell, characterized in that, It includes a battery cell, a housing (20), and a top cover assembly with an explosion-proof plate as claimed in any one of claims 1-8, wherein the battery cell is disposed within the housing (20), and the top cover assembly with the explosion-proof plate is fixed to the open end of the housing (20).

10. A battery module, characterized in that, It includes a housing and a plurality of battery cells as described in claim 9, wherein the plurality of battery cells are disposed within the housing.

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