Battery cell and battery pack
By creating an exhaust space by setting a protrusion on the battery cell casing and installing an explosion-proof valve, the problem of the explosion-proof valve being blocked is solved, enabling timely pressure relief of high-temperature gas and reducing the risk of battery cell explosion.
Patent Information
- Application Number
- CN202422662260.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-10-31
AI Technical Summary
When the explosion-proof valve of the existing battery cell is located at the bottom of the aluminum shell, the core is pressed tightly against the surface of the aluminum shell due to its own weight, which can cause the explosion-proof valve to be blocked. This can lead to the failure to release high-temperature gas in time and may cause an explosion.
A protrusion is provided on the casing of the battery cell. The protrusion protrudes along the height direction to the side away from the top cover, forming an exhaust space. An explosion-proof valve is installed at the protrusion, and the through hole is connected to the exhaust space to ensure that high-temperature gas can be discharged quickly.
By creating an exhaust space through a protrusion on the casing, the explosion-proof valve port is prevented from being blocked, allowing for timely pressure relief of high-temperature gas and reducing the risk of explosion.
Smart Images
Figure CN223539632U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a battery cell and a battery pack. Background Technology
[0002] With the continuous development of technology, users have increasingly higher requirements for new energy batteries. To improve the safety performance of individual battery cells, explosion-proof valves are usually installed on them. When gas is generated inside a battery cell due to abnormal operation, the gas can be released through the explosion-proof valve to prevent major safety accidents.
[0003] In recent years, the explosion-proof valves of individual battery cells have generally been located on the top cover. However, this design is prone to dual failures—electrical insulation and thermal runaway—in the event of battery cell misuse or extreme conditions. With increasingly stringent safety requirements for power batteries, thermoelectric separation designs are becoming more common to mitigate this risk. A typical thermoelectric separation design eliminates the explosion-proof valve on the top cover and instead places it at the bottom of the aluminum casing, thus preventing interference between electrical connection and thermal runaway in the event of battery cell misuse. However, placing the explosion-proof valve on the aluminum casing presents the following problems:
[0004] When the explosion-proof valve is installed on the aluminum shell, the core will press tightly against the surface of the aluminum shell due to its own weight, which will block the explosion-proof valve port. When the battery cell experiences thermal runaway, the high-temperature gas cannot be discharged in time, which can easily lead to an explosion. Utility Model Content
[0005] The purpose of this application is to provide a battery cell and battery pack, thereby solving the problem that the explosion-proof valve of the existing battery cell is located at the bottom of the aluminum shell, and the core will stick to the surface of the aluminum shell due to its own weight, which will block the explosion-proof valve port. In the event of thermal runaway of the battery cell, the high temperature gas cannot be discharged in time, which can easily lead to an explosion.
[0006] According to a first aspect of this application, a battery cell is provided, the battery cell having a height direction, the battery cell comprising: a housing and a top cover, the housing having a receiving cavity and an opening communicating with the receiving cavity, the top cover sealing the opening, the housing having a first wall at one end away from the top cover, the first wall having a protrusion, the protrusion protruding along the height direction towards the side away from the top cover, and the side of the protrusion facing the receiving cavity having an exhaust space communicating with the receiving cavity; along the height direction, the protrusion having a through hole that penetrates itself, the through hole communicating with the exhaust space; and an explosion-proof valve installed in the through hole and sealing the through hole.
[0007] In some embodiments, the convex bulge includes an interconnected platform portion and a connecting eave, the connecting eave surrounding the platform portion; the platform portion is connected to the first wall via the connecting eave, and the through hole is provided in the platform portion; along the height direction, the platform portion is arranged parallel to the first wall, and the connecting eave is arranged obliquely to the first wall.
[0008] In some embodiments, the convex bulge and the housing are integrally formed.
[0009] In some embodiments, the first wall is recessed in a direction away from the top cover to form the exhaust space, and the bulge is formed on the outer surface of the first wall.
[0010] In some embodiments, the bulge is disposed on the surface of the first wall away from the top cover, and the first wall has a through hole that connects the receiving cavity and the exhaust space.
[0011] In some embodiments, the convex bulge further includes an eaves edge disposed at the periphery of the connecting eaves;
[0012] The first wall has a first through hole for mounting the convex bulge, and the thickness of the edge is the same as the thickness of the first wall and is flush with it. The edge is embedded in the first through hole.
[0013] In some embodiments, the outer edge of the eaves is provided with a stepped portion, and the eaves are embedded in the first through hole via the stepped portion.
[0014] In some embodiments, the battery cell further includes a protective patch;
[0015] Along the height direction, the through hole has a first countersunk hole and a second countersunk hole connected from the inside to the outside;
[0016] The explosion-proof valve is fixed to the first recessed hole, and the protective patch is fixed to the second recessed hole.
[0017] In some embodiments, the cross-sectional area of the first countersunk hole is smaller than the cross-sectional area of the second countersunk hole.
[0018] In some embodiments, the outer surface of the convex bulge is provided with an insulating layer.
[0019] According to a second aspect of this application, a battery pack is provided, comprising the battery cells as described above.
[0020] The battery cell of this application includes a casing, an explosion-proof valve, and a top cover. The casing has a receiving cavity, and one end of the casing along its height direction has an opening communicating with the casing. The casing includes a first wall facing away from the opening, and the first wall has an outwardly protruding bulge. The side of the bulge facing the receiving cavity forms an exhaust space communicating with the receiving cavity. Along the height direction, the bulge has a through-hole that communicates with the exhaust space. The explosion-proof valve is installed in the through-hole and seals the through-hole. The top cover seals the opening.
[0021] Based on the above technical features, the beneficial effects of this application are as follows:
[0022] The first wall of the battery cell casing in this application has a bulge. The bulge protrudes a certain height away from the top cover to form a certain venting space inside the casing. In other words, a venting space is formed between the bulge location (the explosion-proof valve inside the bulge's through-hole) and the electrode assembly. Thus, when the battery cell experiences thermal runaway, gas can be quickly discharged to the explosion-proof valve through the venting space, completing the pressure relief. Compared to existing technologies, the bulge design in this application can prevent the electrode assembly from blocking the explosion-proof valve port when the battery cell experiences thermal runaway, thus avoiding problems such as delayed gas discharge and potential explosions.
[0023] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 A schematic diagram of the exploded structure of a single battery cell under the first example of this application is shown;
[0026] Figure 2 This is a schematic diagram of the overall structure of a single battery cell according to the first example of this application;
[0027] Figure 3 Show Figure 1 A schematic diagram of the cross-sectional structure;
[0028] Figure 4 Show Figure 3 A schematic diagram of the enlarged structure of part B;
[0029] Figure 5 Show Figure 3 A schematic diagram of the enlarged structure of part B;
[0030] Figure 6 A schematic diagram of the exploded structure of a single battery cell under the second example of this application is shown;
[0031] Figure 7 Show Figure 6 A schematic diagram of the cross-sectional structure;
[0032] Figure 8 Show Figure 7 A magnified structural diagram of section C;
[0033] Figure 9 This is a schematic diagram of the overall structure of the convex hull under the second example of this application;
[0034] Figure 10 Show Figure 9 A schematic diagram of the cross-sectional structure;
[0035] Figure 11 Show Figure 10 A magnified structural diagram of part E;
[0036] Figure 12 This is a schematic diagram of the overall structure after mounting the explosion-proof valve and protective patch on the convex hull according to the second example of this application;
[0037] Figure 13 Show Figure 12 A schematic diagram of the AA cross-sectional structure;
[0038] Figure 14 This diagram shows the exploded structure of a single battery cell according to this application.
[0039] Icons: 100 - Convex hull; 110 - Platform section; 111 - Through hole; 1111 - Inner through hole; 1112 - First recessed platen hole; 1113 - Third recessed platen hole; 1114 - Second recessed platen hole; 120 - Connecting eaves; 130 - Edge eaves; 131 - Step section; 140 - Exhaust space; 200 - Explosion-proof valve; 300 - Housing; 310 - First wall; 311 - First through hole; 320 - Opening; 400 - Protective patch; 10 - Top cover; 20 - Electrode assembly; 30 - Insulating film; L - Height direction. Detailed Implementation
[0040] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.
[0041] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.
[0042] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.
[0043] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.
[0044] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.
[0045] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.
[0046] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.
[0047] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.
[0048] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.
[0049] Prior to this application, existing battery cells typically employed a thermoelectric separation design that eliminated the explosion-proof valve on the top cover, instead placing it at the bottom of the aluminum casing. This was intended to prevent interference between electrical connections and thermal runaway in the event of battery cell abuse. However, placing the explosion-proof valve on the aluminum casing presents the following problems:
[0050] When the explosion-proof valve is installed on the aluminum shell, the core will press tightly against the surface of the aluminum shell due to its own weight, which will block the explosion-proof valve port. When the battery cell experiences thermal runaway, the high-temperature gas cannot be discharged in time, which can easily lead to an explosion.
[0051] In view of this, the first aspect of this application provides a battery cell that solves the problem that in existing battery cells, the explosion-proof valve is located at the bottom of the aluminum shell, and the core, due to its own weight, adheres tightly to the surface of the aluminum shell, blocking the explosion-proof valve opening. This leads to untimely release of high-temperature gases during thermal runaway of the battery cell, easily causing an explosion. See below for reference. Figures 1 to 14 This application describes some embodiments of the battery cell. For ease of description, the height direction L of the battery cell is introduced below for structural description.
[0052] like Figure 14 As shown, the battery cell of this application includes a housing 300, an explosion-proof valve 200, a top cover 10, an electrode assembly 20, and an insulating film 30 (e.g., Mylar). The housing 300 has a cavity for accommodating the electrode assembly 20, and the insulating film 30 wraps around the electrode assembly 20 to insulate it from the housing 300. The housing 300 communicates with an opening 320 in the cavity, and the top cover 10 seals the opening 320. The housing 300 includes a first wall 310 facing away from the top cover 10, and the first wall 310 has a protrusion 100 that protrudes along the height direction L towards the side facing away from the top cover 10 (see [reference]). Figures 1 to 8 The bulge 100 forms an exhaust space 140 inside the housing 300 (see...). Figure 4 and Figure 8 Along the height direction L, the convex hull 100 has a through hole 111 that penetrates itself (see...). Figure 6 and Figure 9 The through hole 111 is connected to the exhaust space 140; the explosion-proof valve 200 is installed in the through hole 111 and blocks the through hole 111.
[0053] As described above, the top of the casing 300 of the battery cell in this application is provided with an opening 320, and the first wall 310 of the casing 300 is provided with a protrusion 100 protruding away from the top cover 10 (see...). Figure 2 and Figure 6 The bulge 100 protrudes to a certain height to form a certain venting space 140 inside the housing 300. That is, a certain venting space 140 is formed between the bulge 100 (the explosion-proof valve 200 inside the through hole 111 of the bulge 100) and the electrode assembly 20. Thus, when a battery cell experiences thermal runaway, gas can be quickly discharged through the venting space 140 to the explosion-proof valve 200, completing the pressure relief. Compared to existing technologies, the design of the bulge 100 in this application can prevent the electrode assembly 20 from blocking the explosion-proof valve 200 port when a battery cell experiences thermal runaway, thereby preventing untimely gas discharge and potential explosions.
[0054] In the embodiments of this application, as a first example, such as Figures 1 to 3As shown, the housing 300 can be formed as an integral structure with the convex hull 100, that is, the aluminum housing 300 can be integrally stamped with the convex hull 100.
[0055] As a first example, the first wall 310 is recessed in a direction away from the top cover 10 to form an exhaust space 140, and a protrusion 100 is formed on the outer surface of the first wall 310. The protrusion 100 is disposed on the surface of the first wall 310 away from the top cover 10, and a through hole 111 is provided on the first wall 310, which connects the receiving cavity and the exhaust space 140.
[0056] As a first example, such as Figure 4 As shown, the convex bulge 100 includes a platform portion 110 and a connecting eave 120 connected to each other. The connecting eave 120 is arranged around the platform portion 110, and the platform portion 110 is connected to the first wall 310 via the connecting eave 120. A through hole 111 is provided in the platform portion 110. Along the height direction L, the platform portion 110 is arranged parallel to the first wall 310, and the connecting eave 120 is arranged obliquely to the first wall 310. In this way, the platform portion 110 is not only easy to manufacture, but also convenient to provide sufficient installation space for the explosion-proof valve 200 by setting the through hole 111.
[0057] In the embodiments of this application, as a second example, such as Figure 6 and Figure 7 As shown, the housing 300 and the convex hull 100 can be separately formed components, which are then welded together to form a whole.
[0058] As a second example, such as Figure 8 As shown, the convex bulge 100 includes a platform portion 110, a connecting eave 120, and a side eave 130 that are interconnected. The connecting eave 120 is arranged around the platform portion 110, and the side eave 130 is continuously arranged around the connecting eave 120; as shown... Figure 6 As shown, the first wall 310 has a first through hole 311 for mounting the protrusion 100, and the protrusion 100 is welded to the first through hole 311 of the housing 300 through the edge 130.
[0059] Preferably, the platform portion 110 of this application is parallel to the first wall 310 of the housing 300. This not only facilitates the manufacturing of the platform portion 110, but also makes it convenient to provide sufficient installation space for the explosion-proof valve 200 by setting the through hole 111. Moreover, the thickness of the edge 130 is the same as the thickness of the first wall 310, and the edge 130 is flush with the housing 300, which facilitates the edge 130 being embedded in the first through hole 311 and welded and fixed.
[0060] As a second example, furthermore, to facilitate the welding and fixing of the housing 300 and the protrusion 100, such as... Figure 8 As shown, the outer edge of the eaves 130 may also be provided with a stepped portion 131, and the eaves 130 is embedded in the first through hole 311 via the stepped portion 131.
[0061] Furthermore, it is worth mentioning that in the embodiments of this application, regardless of whether the housing 300 and the protrusion 100 are formed as an integral stamped structure, or whether the housing 300 and the protrusion 100 are separately formed components, the battery cell meets the following dimensions:
[0062] A single battery cell satisfies the following condition: 100° ≤ A ≤ 170°; where, for example... Figure 4 As shown, A is the angle between the outer surface S1 of the connecting eaves 120 and the outer surface S2 of the housing 300. When the angle is too small, cracks are easily generated on the outer surface S1 of the connecting eaves 120 during the manufacturing process; when the angle is too large, the gap formed between the explosion-proof valve 200 and the inner surface of the housing 300 is small, and blockage is easily caused when the battery cell experiences thermal runaway.
[0063] The battery cell must meet the following requirements: 0.5mm ≤ D ≤ 5mm; where, for example... Figure 5 As shown, D is the distance between the outer surface S3 of the platform 110 and the outer surface S2 of the housing 300 along the height direction L. When the distance (height difference) is too small, the gap formed between the explosion-proof valve 200 and the inner surface of the housing 300 is small, and blockage is likely to occur when the battery cell experiences thermal runaway; when the distance (height difference) is too large, cracks are likely to occur on the outer surface S1 of the connecting eaves 120 during the manufacturing process.
[0064] The battery cell must satisfy the following condition: 40 ≤ (AD) / T ≤ 600; where, for example... Figure 5 As shown, A is the angle between the outer surface S1 of the connecting eaves 120 and the outer surface S2 of the housing 300; D is the distance between the outer surface S3 of the platform portion 110 and the outer surface S2 of the housing 300 along the height direction L; T is the thickness of the platform portion 110. When the ratio of (AD) / T is too small, cracks are easily generated on the outer surface S1 of the connecting eaves 120 during the manufacturing process; when the ratio of (AD) / T is too large, the gap formed between the explosion-proof valve 200 and the inner surface of the housing 300 is small, and blockage is easily caused when the battery cell experiences thermal runaway.
[0065] Furthermore, in the embodiments of this application, the outer surface of the protrusion 100 may also be provided with an insulating layer. The insulating layer can prevent the protrusion area from being too close to other structural components in the system layout, thereby causing insulation failure.
[0066] As an example, the insulating layer may be an insulating coating applied to the outer surface of the convex 100; or the insulating layer may be an insulating film layer covering the outer surface of the convex 100; or the insulating layer may be an insulating element (e.g., an insulating element conforming to the shape of the convex 100) covering the outer surface of the convex 100.
[0067] The following will combine Figures 9 to 13 Describe the connection structure between the explosion-proof valve 200 and the protective patch and the convex bulge 100.
[0068] In the embodiments of this application, such as Figure 11 As shown, along the height direction L, the through hole 111 has an inner through hole 1111, a first countersunk hole 1112, a third countersunk hole 1113, and a second countersunk hole 1114 connected sequentially from the inside to the outside. The cross-sectional areas of the inner through hole 1111, the first countersunk hole 1112, the third countersunk hole 1113, and the second countersunk hole 1114 increase sequentially to form a continuous stepped structure. Wherein, as... Figure 13 As shown, the explosion-proof valve 200 is fixed to the first recessed hole 1112. The through hole 111 forms a continuous stepped structure. Fixing the explosion-proof valve 200 to the first recessed hole 1112 not only facilitates the installation and assembly of the explosion-proof valve 200 but also facilitates the pressure relief of the battery cells. The protective patch 400 is fixed to the second recessed hole 1114 to protect the explosion-proof valve 200 from scratches.
[0069] In summary, the top of the housing 300 of the battery cell in this application has an opening 320, and the first wall 310 of the housing 300 has an outwardly protruding bulge 100. The bulge 100 protrudes outward to a certain height to form a certain exhaust space 140 inside the housing 300. That is, a certain exhaust space 140 is formed between the bulge 100 (the explosion-proof valve 200 inside the through hole 111 of the bulge 100) and the electrode assembly 20 (including the winding core). Thus, when the battery cell experiences thermal runaway, the gas can be quickly discharged to the explosion-proof valve 200 through the exhaust space 140 to complete the pressure relief. Compared with the prior art, the design of the bulge 100 of the housing 300 in this application can avoid the electrode assembly 20 blocking the explosion-proof valve 200 when the battery cell experiences thermal runaway, thereby affecting the untimely gas discharge and causing explosions. In addition, the bulge 100 of the housing 300 has a simple structure, is easy to manufacture, and reduces costs.
[0070] According to a second aspect of this application, a battery pack is provided, comprising the battery cells as described above.
[0071] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in this application, or make equivalent substitutions for some of the technical features. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application.
Claims
1. A battery cell, said battery cell having a height direction (L), characterized in that, The battery cell includes: The housing (300) and the top cover (10) are provided. The housing (300) has a receiving cavity and an opening (320) communicating with the receiving cavity. The top cover (10) covers the opening (320). The housing (300) includes a first wall (310) away from the top cover (10). The first wall (310) is provided with a protrusion (100). The protrusion (100) protrudes along the height direction (L) toward the side away from the top cover (10), and the side of the protrusion (100) facing the receiving cavity has an exhaust space (140) communicating with the receiving cavity. Along the height direction (L), the protrusion (100) has a through hole (111) that penetrates itself and communicates with the exhaust space (140). An explosion-proof valve (200) is installed in the through hole (111) and blocks the through hole (111).
2. The battery cell according to claim 1, characterized in that, The convex hull (100) includes a platform portion (110) and a connecting eave (120) that are connected to each other, and the connecting eave (120) is arranged around the platform portion (110); The platform section (110) is connected to the first wall (310) via the connecting eaves (120), and the through hole (111) is provided in the platform section (110); Along the height direction (L), the platform portion (110) is arranged parallel to the first wall (310), and the connecting eaves (120) is arranged obliquely to the first wall (310).
3. The battery cell according to claim 1 or 2, characterized in that, The convex bulge (100) and the shell (300) are integrally formed.
4. The battery cell according to claim 1 or 2, characterized in that, The first wall (310) is recessed in a direction away from the top cover (10) to form the exhaust space (140), and the bulge (100) is formed on the outer surface of the first wall (310).
5. The battery cell according to claim 2, characterized in that, The protrusion (100) is disposed on the surface of the first wall (310) away from the top cover (10), and the first wall (310) is provided with a first through hole (311), which connects the receiving cavity and the exhaust space (140).
6. The battery cell according to claim 5, characterized in that, The convex bulge (100) also includes an eaves (130), which is disposed at the periphery of the connecting eaves (120); The thickness of the edge (130) is the same as the thickness of the first wall (310) and is flush with it. The edge (130) is embedded in the first through hole (311).
7. The battery cell according to claim 6, characterized in that, The outer edge of the eaves (130) is provided with a stepped portion (131), and the eaves (130) is embedded in the first through hole (311) via the stepped portion (131).
8. The battery cell according to claim 1 or 2, characterized in that, The battery cell also includes a protective patch (400); Along the height direction (L), the through hole (111) has a first countersunk hole (1112) and a second countersunk hole (1114) connected from the inside to the outside; The explosion-proof valve (200) is fixed to the first recessed hole (1112), and the protective patch (400) is fixed to the second recessed hole (1114).
9. The battery cell according to claim 8, characterized in that, The cross-sectional area of the first countersunk hole (1112) is smaller than the cross-sectional area of the second countersunk hole (1114).
10. The battery cell according to claim 1 or 2, characterized in that, An insulating layer is provided on the outer surface of the convex hull (100).
11. A battery pack, characterized in that, Includes the battery cell as described in any one of claims 1-10.