Battery cell protection assembly and battery cell

Abstract

The invention relates to the technical field of batteries, in particular to a battery cell protection assembly and a battery cell. The battery cell protection assembly comprises a pressure relief piece embedded in the exhaust hole; the protection piece is attached to one side, facing the outside of the battery cell, of the battery cell cover plate and covers the exhaust hole; the protection piece comprises a protection part and a pasting part which are arranged in a stacked mode, the protection part completely covers the exhaust hole, the pasting part is clamped between the battery cell cover plate and the protection part, a flow guide groove communicated with the exhaust hole and the exterior of the battery cell is formed in the pasting part, and the width size W of the flow guide groove before the protection piece is pasted is larger than or equal to 0.1 mm. According to the invention, the pasting part is provided with the diversion trench which is communicated with the exhaust hole and the outside of the battery cell, so that the integrity of the protection part is ensured, the protection and exhaust requirements of the pressure relief piece are met, the risk that the pressure relief piece is polluted is effectively reduced, and the safety protection reliability of the battery cell is improved. W is greater than or equal to 0.1 mm, so that after the protection piece is adhered, the exhaust holes can be communicated with the exterior of the battery cell, and the reliable conduction effect of the diversion trench is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cell protection component and a battery cell. Background Art

[0002] The structure of a lithium-ion battery consists of a cover plate, a housing, a pole group, an electrolyte, an internal and external insulation structure, etc. To ensure the safety of the battery, an explosion-proof valve is installed on the battery cover plate. When the battery has an accident due to improper charging, short circuit or exposure to harsh environments such as high temperature, a high-energy battery will generate a large amount of gas and the temperature will rise sharply. The gas will blow open the explosion-proof valve to achieve the purpose of pressure relief, thus greatly improving the safety performance of the battery. To prevent sharp objects from damaging the explosion-proof valve or foreign objects and dust from falling into the explosion-proof valve and affecting the safety of the battery, a protective patch is provided on the explosion-proof valve. An opening is provided on the protective patch on the cover plate to play a role in exhaust and conduction. It is easy for electrolyte impurities, etc. to enter the explosion-proof valve, causing damage to the explosion-proof valve, affecting the bursting strength of the explosion-proof valve, and resulting in the failure of the safety protection of the battery cell. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a battery cell protection component and a battery cell to solve the problem that openings are provided on the protective patch of the existing explosion-proof valve, and it is easy for electrolyte impurities, etc. to enter the explosion-proof valve, causing damage to the explosion-proof valve, affecting the bursting strength of the explosion-proof valve, and resulting in the failure of the safety protection of the battery cell.

[0004] The first aspect of the present invention provides a battery cell protection component, which is arranged on a battery cell cover plate. An exhaust hole is provided on the battery cell cover plate. Wherein, the battery cell protection component includes: A pressure relief member, embedded in the exhaust hole; A protection member, attached to the side of the battery cell cover plate facing the outside of the battery cell and covering the exhaust hole; the protection member includes a protection part and a pasting part arranged in a stacked manner. The protection part completely covers the exhaust hole. The pasting part is clamped between the battery cell cover plate and the protection part. A diversion groove communicating the exhaust hole and the outside of the battery cell is provided on the pasting part. The width dimension of the diversion groove before the protection member is pasted is W, and W≥0.1mm; The total area of the diversion groove is X, in mm 2 ; the area of the protection member is Y, in mm 2 ; the area of the exhaust hole is Z, in mm 2 ; M = X / Z, 0.005≤M≤0.14; N = X / (Y - Z), 14.5%≤N≤33%.

[0005] Preferably, the pasting part is formed into an annular structure with an opening, and the diversion groove is provided at the opening of the annular structure.

[0006] Preferably, a plurality of the diversion grooves are provided, and the plurality of the diversion grooves are spaced apart on the pasting portion.

[0007] Preferably, at least two of the diversion grooves are arranged opposite to each other on the pasting portion.

[0008] Preferably, the thickness dimension of the protection portion is H1, and 0.05 mm ≤ H1 ≤ 10 mm.

[0009] Preferably, the thickness dimension of the pasting portion is H2, and 0.01 mm ≤ H2 ≤ 5 mm.

[0010] Preferably, the pasting portion is arranged at the edge of the protection portion, and the shape of the protection portion is the same as the shape of the exhaust hole.

[0011] Preferably, a convex platform is formed on the inner wall of the exhaust hole. The convex platform is arranged at one end of the exhaust hole facing the outside of the battery cell. The pressure relief member abuts against one end of the convex platform facing the inside of the battery cell, and the protection member adheres to one end of the convex platform facing the outside of the battery cell.

[0012] Preferably, a recessed scoring portion is provided on the pressure relief member. The pressure inside the battery cell can break through the pressure relief member, causing the pressure relief member to crack along the shape of the scoring portion.

[0013] In a second aspect of the present invention, a battery cell is provided, including the battery cell protection assembly according to any one of the above technical solutions.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The battery cell protection assembly of the present invention includes a pressure relief member and a protection member. The pressure relief member is embedded in the exhaust hole; the protection member is attached to the side of the battery cell cover facing the outside of the battery cell and covers the exhaust hole; the protection member includes a protection portion and a pasting portion arranged in a stacked manner. The protection portion completely covers the exhaust hole, and the pasting portion is clamped between the battery cell cover and the protection portion. A diversion groove communicating the exhaust hole and the outside of the battery cell is provided on the pasting portion, so as to ensure the integrity of the protection portion, meet the protection and exhaust requirements for the pressure relief member, effectively reduce the risk of the pressure relief member being contaminated, and thus improve the reliability of the safety protection for the battery cell. In addition, the width dimension of the diversion groove before the protection member is pasted is W, W ≥ 0.1 mm, the total area of the diversion grooves is X, in mm 2 ; the area of the protection member is Y, in mm 2 ; the area of the exhaust hole is Z, in mm 2 ; M = X / Z, 0.005 ≤ M ≤ 0.14; N = X / (Y - Z), 14.5% ≤ N ≤ 33%, so as to ensure that the exhaust hole can be kept communicating with the outside of the battery cell after the protection member is pasted, making the diversion groove have a reliable conduction function.

[0015] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides preferred embodiments in conjunction with the accompanying drawings and makes a detailed description as follows. Description of the Drawings

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 The first structural schematic diagram of the battery cell protection component provided by the embodiment of the present invention; Figure 2 For Figure 1 The cross-sectional view taken along the A-A section in Figure 3 The schematic diagram of the first structure of the battery cell protection component provided by the embodiment of the present invention from another perspective; Figure 4 The schematic diagram of the first structure of the battery cell protection component provided by the embodiment of the present invention from yet another perspective; Figure 5 For Figure 4 The enlarged structural schematic diagram at B in Figure 6 The second structural schematic diagram of the battery cell protection component provided by the embodiment of the present invention; Figure 7 The schematic diagram of the second structure of the battery cell protection component provided by the embodiment of the present invention from another perspective; Figure 8 The structural schematic diagram of the battery cell protection component provided by the embodiment of the present invention installed on the battery cell cover plate; Figure 9 For Figure 8 The cross-sectional view taken along the C-C section in Figure 10 For Figure 9 The enlarged structural schematic diagram at D in

[0018] Reference numerals: 10 - pressure relief member; 11 - thinning groove; 111 - scoring portion; 20 - protection member; 21 - protection portion; 22 - pasting portion; 221 - diversion groove; 30 - battery cell cover plate; 40 - exhaust hole; 41 - boss. Detailed Embodiments

[0019] The following specific embodiments are provided to assist the reader in obtaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, 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 exemplary and is not limited to the order set forth herein. Rather, changes that will be apparent after understanding the disclosure of this application may be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for increased clarity and conciseness.

[0020] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, apparatuses, and / or systems described herein that will be apparent after understanding the disclosure of this application.

[0021] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on," "connected to," "coupled to," "above," or "covering" another element, it can be directly "on," "connected to," "coupled to," "above," or "covering" the other element, or there can be one or more other elements intervening therebetween. In contrast, when an element is described as being "directly on," "directly connected to," "directly coupled to," "directly above," or "directly covering" another element, there can be no other elements intervening therebetween.

[0022] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0023] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or parts, these members, components, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or part from another. Thus, a first member, component, region, layer, or part as referred to in the examples described herein may also be referred to as a second member, component, region, layer, or part without departing from the teachings of the examples.

[0024] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship between one element and another as shown in the accompanying drawings. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is flipped, an element described as "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations of "above" and "below" 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 relationship terms used herein will be interpreted accordingly.

[0025] The terms used herein are for the purpose of describing various examples only and are not intended to limit the disclosure. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising", "including", and "having" enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0026] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the accompanying drawings may occur. Thus, the examples described herein are not limited to the specific shapes shown in the accompanying drawings but include changes in shape that occur during manufacturing.

[0027] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0028] According to a first aspect of the present invention, a cell protection assembly is provided, which specifically includes a pressure relief member 10 and a protection member 20.

[0029] Hereinafter, the specific structure of the cell protection assembly according to this embodiment will be described as above.

[0030] In this embodiment, as Figure 8 and Figure 9 shown, the cell protection assembly is disposed on the cell cover plate 30, and an exhaust hole 40 is formed on the cell cover plate 30. The exhaust hole 40 is a through-hole structure that communicates the inside and outside of the cell. When gas is generated inside the cell due to failure, pressure relief is achieved via the exhaust hole 40 to ensure the safety performance of the cell.

[0031] Specifically, as Figure 9 and Figure 10As shown, the pressure relief member 10 is embedded in the exhaust hole 40 to block the exhaust hole 40 through the pressure relief member 10. The pressure relief member 10 can be an explosion-proof valve, and the pressure relief member 10 is preferably welded and fixed to the battery cell cover plate 30.

[0032] In a preferred embodiment, as Figure 9 and Figure 10 shown, a protruding boss 41 is formed on the inner wall of the exhaust hole 40. The boss 41 is arranged at one end of the exhaust hole 40 facing the outside of the battery cell. The pressure relief member 10 abuts against one end of the boss 41 facing the inside of the battery cell. In this way, the boss 41 can play a certain role in supporting and positioning the pressure relief member 10, ensuring that the pressure relief member 10 is firmly fixed to the exhaust hole 40. The boss 41 is preferably formed as an annular structure and protrudes inward along the radial direction of the exhaust hole 40 to improve the effectiveness and reliability of the supporting effect on the pressure relief member 10.

[0033] Furthermore, in this embodiment, as Figure 9 and Figure 10 shown, a recessed scoring portion 111 is provided on the pressure relief member 10. The pressure inside the battery cell can break through the pressure relief member 10, causing the pressure relief member 10 to crack along the shape of the scoring portion 111, and the air pressure inside the battery cell will lift a part of the pressure relief member 10 outward to achieve the communication between the inside and outside of the battery cell. The scoring portion 111 can be an annular structure with an opening, so that the lifted part remains connected to the non-lifted part when the pressure relief member 10 is broken through, thereby avoiding the metal sheet falling off and causing short-circuit latching. Preferably, the scoring portion 111 is arranged on the side of the pressure relief member 10 facing the outside of the battery cell to ensure that the pressure relief member 10 can be opened in time when the preset pressure is reached inside the battery cell.

[0034] In an alternative embodiment, as Figure 9 and Figure 10 shown, a recessed thinning groove 11 is provided on the side of the pressure relief member 10 facing the outside of the battery cell, and the scoring portion 111 is arranged on the bottom wall of the thinning groove 11. In this way, it is ensured that the circumferential edge of the pressure relief member 10 has sufficient structural strength to avoid the pressure relief member 10 being deformed and opened in advance, and the thickness of the area where the scoring portion 111 is arranged can be thinned, facilitating the pressure relief member 10 to be lifted outward, increasing the exhaust area, and achieving rapid pressure relief.

[0035] In this embodiment, as Figures 1 to 10 shown, the protection member 20 is attached to the side of the battery cell cover plate 30 facing the outside of the battery cell and covers the exhaust hole 40; specifically, the protection member 20 is attached to one end of the boss 41 facing the outside of the battery cell to protect the pressure relief member 10 arranged inside the exhaust hole 40.

[0036] More specifically, as Figures 1 to 7As shown in the figure, the protective member 20 includes a protective part 21 and an adhesive part 22 arranged in a stacked manner. The protective part 21 can be a film made of PET material, and the adhesive part 22 can be an adhesive layer. There are no slots or holes in the protective part 21 so that it can completely cover the exhaust hole 40. The adhesive part 22 is clamped between the cell cover plate 30 and the protective part 21, so that the protective member 20 is adhered to the surface of the cell cover plate 30. A diversion groove 221 communicating the exhaust hole 40 and the outside of the cell is provided on the adhesive part 22. In this way, the diversion groove 221 is provided on the side of the protective member 20 and does not damage the structure of the protective part 21, thus ensuring the integrity of the protective part 21, meeting the protection and exhaust requirements of the pressure relief member 10, effectively reducing the risk of the pressure relief member 10 being contaminated, and thereby enhancing the reliability of the safety protection of the cell.

[0037] In this embodiment, as Figure 5 shown, the width dimension of the diversion groove 221 before the protective member 20 is adhered is W, W≥0.1mm, and the total area of the diversion groove 221 is X, with the unit of mm 2 ; the area of the protective member 20 is Y, with the unit of mm 2 ; the area of the exhaust hole 40 is Z, with the unit of mm 2 ; M = X / Z, 0.005≤M≤0.14; N = X / (Y - Z), 14.5%≤N≤33%. In this way, it is ensured that the exhaust hole 40 can remain connected to the outside of the cell after the protective member 20 is adhered, so that the diversion groove 221 has a reliable conduction function. It should be noted that the total area X of the diversion groove 221 is the sum of the areas of all the diversion grooves 221 projected on the protective member 20 along the thickness direction of the protective member 20. The area Y of the protective member 20 is the area of the plane where the protective part 21 is located, and the area Z of the exhaust hole 40 is the area of the opening part on the exhaust hole 40 that can communicate the inside and outside of the cell.

[0038] Next, cell safety tests are carried out on cells with different X, Y, and Z dimensions to verify whether the exhaust capacity of the pressure relief member 10 is reliable and whether the protective member 20 can be adhered firmly. The test results are shown in Table 1 below.

[0039] Table 1

[0040] Note: In the table, the result of "OK" indicates that the test result is qualified, and the result of "NG" indicates that there are problems during the test.

[0041] Referring to Table 1, it can be seen that in Examples 1 to 8, the limits of 0.005 ≤ M ≤ 0.14 and 14.5% ≤ N ≤ 33% are satisfied, the cell safety test is qualified, and the protective member 20 is firmly pasted; while in Comparative Example 1, due to the too small parameters of M and N, the exhaust capacity of the pressure relief member 10 is insufficient, which is likely to cause problems such as deformation of the pressure relief member 10 and unstable bursting pressure, resulting in the failure of the cell safety test; in Comparative Example 2, due to the too small parameter of N, the exhaust capacity of the pressure relief member 10 is insufficient, which is likely to cause problems such as deformation of the pressure relief member 10 and unstable bursting pressure, resulting in the failure of the cell safety test; in Comparative Example 3, due to the too large parameter of N, the glue-free area on the protective member 20 is relatively large, the bonding strength of the protective member 20 is poor and it is easy to fall off, and the risk of pollution and damage to the pressure relief member 10 increases; in Comparative Example 4, due to the too large parameters of M and N, the glue-free area on the protective member 20 is relatively large, the bonding strength of the protective member 20 is poor and it is easy to fall off, and the risk of pollution and damage to the pressure relief member 10 increases.

[0042] In this embodiment, the flow guiding groove 221 can be formed into a polygon, a circle or an arc shape, etc., as long as it is ensured that the exhaust hole 40 can communicate with the outside of the cell.

[0043] In the first optional implementation manner, as Figures 1 to 5 shown, the protection part 21 can be formed into a structure similar to a runway shape with semi-circular sides and a rectangular middle. In the second optional implementation manner, as Figure 6 and Figure 7 shown, the protection part 21 is formed into a circular structure. However, the structure of the protection part 21 is not limited to this, and it can also be formed into a polygon structure, such as a rectangle, as long as it can effectively block the exhaust hole 40 to achieve a reliable protection effect. In the preferred implementation manner, the shape of the protection part 21 is the same as the shape of the exhaust hole 40, so as to ensure that the protection part 21 can effectively cover the exhaust hole 40 and will not overly block the surface of the cell cover 30, avoiding affecting the bonding effect and coverage area of the insulating patch on the cell cover 30.

[0044] In this embodiment, as Figure 3 and Figure 7 shown, the pasting part 22 is formed into an annular structure with an opening, and the flow guiding groove 221 is arranged at the opening of the annular structure. Preferably, the pasting part 22 is arranged at the edge of the protection part 21 to ensure that the protective member 20 is firmly fixed on the cell cover 30 and can also save costs.

[0045] In the preferred implementation manner, as Figures 3 to 5 and Figure 7 shown, a plurality of flow guiding grooves 221 are provided, and the plurality of flow guiding grooves 221 are spaced apart on the pasting part 22 to ensure sufficient exhaust area and uniform exhaust.

[0046] Further, in this embodiment, as Figure 3 and Figure 7 shown, at least two flow guiding grooves 221 are disposed opposite to each other on the pasting portion 22, so as to achieve rapid and uniform exhaust.

[0047] In this embodiment, as Figure 4 and Figure 5 shown, the thickness dimension of the protection portion 21 is H1, 0.05 mm ≤ H1 ≤ 10 mm, so as to ensure that the protection portion 21 has sufficient structural strength to meet the protection requirements for the pressure relief member 10, and also avoid the excessive size of H1 from occupying the cell space and affecting the energy density of the cell.

[0048] In this embodiment, as Figure 5 shown, the thickness dimension of the pasting portion 22 is H2, 0.01 mm ≤ H2 ≤ 5 mm, so as to ensure that the pasting portion 22 has sufficient bonding strength to avoid the protection member 20 from falling off the cell cover plate 30, and also avoid the excessive size of H2 from occupying the cell space and affecting the energy density of the cell.

[0049] A cell protection assembly provided according to the present invention includes a pressure relief member and a protection member. The pressure relief member is embedded in the exhaust hole; the protection member is attached to the side of the cell cover plate facing the outside of the cell and covers the exhaust hole; the protection member includes a protection portion and a pasting portion which are stacked. The protection portion completely covers the exhaust hole, and the pasting portion is clamped between the cell cover plate and the protection portion. A flow guiding groove communicating the exhaust hole and the outside of the cell is formed on the pasting portion, so as to ensure the integrity of the protection portion, meet the protection and exhaust requirements for the pressure relief member, effectively reduce the risk of the pressure relief member being contaminated, and thus improve the reliability of the safety protection for the cell. In addition, the width dimension of the flow guiding groove before pasting the protection member is W, W ≥ 0.1 mm, the total area of the flow guiding grooves is X, in mm 2 ; the area of the protection member is Y, in mm 2 ; the area of the exhaust hole is Z, in mm 2 ; M = X / Z, 0.005 ≤ M ≤ 0.14; N = X / (Y - Z), 14.5% ≤ N ≤ 33%, so as to ensure that the exhaust hole can remain in communication with the outside of the cell after pasting the protection member, so that the flow guiding groove has a reliable conduction effect.

[0050] A cell provided according to the present invention has the above-mentioned cell protection assembly attached to the cell cover plate of the cell, which effectively prevents the pressure relief member from being contaminated, thus ensuring the bursting strength of the pressure relief member and the safety performance of the cell.

[0051] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit it. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the art within the technical scope disclosed by the present application can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or make equivalent replacements for some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery cell protection assembly, arranged on a battery cell cover plate, wherein the battery cell cover plate is provided with an exhaust hole, characterized in that: The battery cell protection component comprises: A pressure relief member, embedded in the exhaust hole; A protective member is attached to a side of the cell cover plate facing the outside of the cell and covers the exhaust hole; the protective member comprises a protective portion and an adhesive portion which are stacked, the protective portion completely covers the exhaust hole, the adhesive portion is sandwiched between the cell cover plate and the protective portion, a guide groove connecting the exhaust hole and the outside of the cell is formed on the adhesive portion, and the width of the guide groove before the protective member is attached is W, W ≥ 0.1 mm; The total area of ​​the guide groove is X, in mm 2 ; The area of ​​the protective member is Y, in mm 2 ; The area of ​​the exhaust hole is Z, in mm 2 ;M=X / Z, 0.005≤M≤0.14; N=X / (YZ), 14.5%≤N≤33%.

2. The battery cell protection assembly according to claim 1, characterized in that: The adhesive portion is formed as an annular structure with an opening, and the guide groove is arranged at the opening of the annular structure.

3. The battery cell protection assembly according to claim 1, characterized in that: A plurality of guide grooves are provided, and the plurality of guide grooves are arranged at intervals on the pasting portion.

4. The battery cell protection assembly according to claim 3, characterized in that: At least two of the guide grooves are arranged on the adhesive portion opposite to each other.

5. The battery cell protection assembly according to claim 1, characterized in that: The thickness dimension of the protection portion is H1, 0.05mm≤H1≤10mm.

6. The battery cell protection assembly according to claim 1, characterized in that: The thickness dimension of the adhesive portion is H2, 0.01mm≤H2≤5mm.

7. The battery cell protection assembly according to claim 1, characterized in that: The adhesive portion is arranged at the edge of the protection portion, and the shape of the protection portion is the same as the shape of the exhaust hole.

8. The battery cell protection assembly according to claim 1, characterized in that: The inner wall of the exhaust hole is formed with a protruding boss, the boss is arranged at one end of the exhaust hole facing the outside of the battery cell, the pressure relief member abuts against one end of the boss facing the inside of the battery cell, and the protective member is attached to one end of the boss facing the outside of the battery cell.

9. The battery cell protection assembly according to claim 1, characterized in that: The pressure relief member is provided with a concave notch, and the pressure inside the battery cell can break through the pressure relief member, so that the pressure relief member cracks along the shape of the notch.

10. A battery cell, characterized in that: A battery cell protection component comprising any one of claims 1 to 9.

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