Explosion-proof valve protection patch assembly, battery cell and battery pack

Abstract

The utility model relates to battery technical field discloses explosion -proof valve protection patch assembly, electric core and battery package. Explosion -proof valve protection patch assembly includes patch, adhesive layer and sealing layer. The patch includes main patch and auxiliary patch, and the patch includes sealed state and clearance state, in sealed state, auxiliary patch is spliced with main patch to cover explosion -proof valve mounting hole completely, in clearance state, auxiliary patch is dismantled to make main patch and explosion -proof valve mounting hole exist exhaust clearance, adhesive layer sets up along the edge of patch, the first bonding surface of adhesive layer and the first surface of the cover plate of patch towards electric core bond, the second bonding surface of adhesive layer is suitable for and the cover plate bond, sealing layer is detachably arranged in the second surface of the patch away from the cover plate and seals the splicing clearance of main patch and auxiliary patch. The utility model can effectively block the corrosive substance such as electrolyte, dust and so on and invade the inside of explosion -proof valve, simultaneously, auxiliary patch can be removed, and the accuracy and reliability of airtightness detection are improved obviously.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to explosion-proof valve protection patch assembly, battery cell and battery pack. Background Technology

[0002] The cover plate of a battery cell is a crucial component of a lithium-ion battery, and its structure typically includes key components such as terminals, electrolyte filling holes, and explosion-proof valves. As a core structural element for cell safety, the explosion-proof valve is primarily used to rapidly release internal pressure by rupturing or opening when the internal pressure rises sharply due to overcharging, thermal runaway, or other reasons, thereby preventing battery explosion or fire. Explosion-proof valves usually employ a thin-walled structure or a grooved design. When the internal pressure exceeds a set threshold, the valve body ruptures or deforms, creating a pressure relief channel and ensuring the battery's safe operation.

[0003] Because explosion-proof valves are highly sensitive, their surfaces are easily contaminated or corroded by external dust, electrolyte splashes, or other foreign matter, which can affect their normal pressure relief function. Therefore, a protective patch is typically added above the explosion-proof valve. This patch effectively blocks external contaminants while allowing gas to pass through smoothly. The protective patch needs to have a certain degree of air permeability and mechanical strength to prevent foreign object intrusion without hindering the normal opening of the explosion-proof valve. Furthermore, the protective patch can also mitigate damage to the explosion-proof valve from external mechanical impacts to some extent, improving the overall reliability of the valve.

[0004] Currently, there are two types of explosion-proof valve protection patches: cut-out type and full-coverage type. For cut-out type patches, electrolyte overflow can occur during the battery cell filling process. The overflowing electrolyte will flow into the cut-out part of the protection patch and contaminate the explosion-proof valve. For full-coverage type patches, the patch can completely cover the explosion-proof valve, but it will affect the reliability of the explosion-proof valve's airtightness test. Utility Model Content

[0005] In view of this, the present invention provides an explosion-proof valve protection patch assembly, a battery cell, and a battery pack to solve the problem that current explosion-proof valve protection patches cannot simultaneously prevent electrolyte contamination of the explosion-proof valve and ensure that airtightness testing is not affected.

[0006] In a first aspect, this utility model provides an explosion-proof valve protection patch assembly, which is attached to the explosion-proof valve mounting hole of the cover plate of the battery cell. The explosion-proof valve protection patch assembly includes a patch, an adhesive layer, and a sealing layer. The patch includes a main patch and an auxiliary patch, and the patch has a sealed state and a gap state. In the sealed state, the auxiliary patch is spliced ​​with the main patch to completely cover the explosion-proof valve mounting hole; in the gap state, the auxiliary patch is disassembled to create an exhaust gap between the main patch and the explosion-proof valve mounting hole; the adhesive layer is disposed along the edge of the patch, the first adhesive surface of the adhesive layer is bonded to the first surface of the patch facing the cover plate, and the second adhesive surface of the adhesive layer is adapted to bond to the cover plate; the sealing layer is detachably disposed on the second surface of the patch away from the cover plate and seals the splicing gap between the main patch and the auxiliary patch.

[0007] Beneficial Effects: This utility model provides an explosion-proof valve protection patch assembly. Through its unique splicing patch structure, switchable sealing and gap states, and removable sealing layer, it achieves protection and testing adaptation for the battery cell explosion-proof valve. During the battery cell electrolyte filling process, the auxiliary patch and the main patch are spliced ​​together to form a complete cover layer. The explosion-proof valve protection patch is in a sealed state for the explosion-proof valve, and the adhesive layer is tightly bonded to the battery cell cover plate. At the same time, the sealing layer further seals the splicing gap between the main patch and the auxiliary patch, effectively preventing electrolyte, dust, and other corrosive substances from entering the explosion-proof valve and avoiding decreased sensitivity or failure of the explosion-proof valve due to contamination or corrosion. When it is necessary to perform airtightness testing on the explosion-proof valve and cell end during battery production or maintenance, the auxiliary patch can be removed to create a gap between the main patch and the explosion-proof valve mounting hole. This allows the test gas (such as helium) to freely enter the explosion-proof valve area through the gap, avoiding the problem of gas flow obstruction and helium detection caused by the complete coverage of the traditional integral patch, thereby significantly improving the accuracy and reliability of airtightness testing.

[0008] In one alternative embodiment, the adhesive layer includes a main adhesive layer corresponding to the main patch and an auxiliary adhesive layer corresponding to the auxiliary patch.

[0009] In one optional embodiment, the thickness of the adhesive layer is T, in mm, where 0.05 mm ≤ T ≤ 0.15 mm.

[0010] In one optional embodiment, the bonding width between the main adhesive layer and the cover plate is W, in mm, where 0.5 mm ≤ W ≤ 1.2 mm.

[0011] In one optional embodiment, the bonding area between the auxiliary adhesive layer and the cover plate is S1, in mm. 2 The area of ​​the auxiliary patch is S, in mm. 2 ,satisfy:

[0012] 0.2≤S1 / S≤0.4.

[0013] In one alternative embodiment, the surface of the sealing layer facing away from the patch has color-enhancing features to improve visual visibility.

[0014] In one optional embodiment, the bonding area between the sealing layer and the auxiliary patch is S2, in mm. 2 The area of ​​the auxiliary patch is S, in mm. 2 ,satisfy:

[0015] 0.7≤S2 / S≤0.9.

[0016] In one alternative embodiment, the main patch, projected along the thickness direction of the cover plate, covers 80% to 95% of the opening area of ​​the explosion-proof valve mounting hole.

[0017] Secondly, this utility model also provides a battery cell, including a cover plate and an explosion-proof valve protection patch assembly according to any of the above technical solutions. The cover plate includes an explosion-proof valve mounting hole and an explosion-proof valve disposed in the explosion-proof valve mounting hole; the explosion-proof valve protection patch assembly is attached to the outside of the explosion-proof valve mounting hole and covers the explosion-proof valve.

[0018] Beneficial effects: Since the battery cell includes the explosion-proof valve protection patch assembly, it has all the technical effects of the explosion-proof valve protection patch assembly, which will not be elaborated here.

[0019] Thirdly, this utility model also provides a battery pack, including the battery cells described in the above technical solutions.

[0020] Beneficial effects: Since the battery pack includes the cells, it has all the technical benefits of the cells, which will not be elaborated here. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of an explosion-proof valve protection patch assembly according to an embodiment of the present utility model;

[0023] Figure 2 for Figure 1 The exploded view of the explosion-proof valve protection patch assembly shown.

[0024] Figure 3 for Figure 1 The explosion-proof valve protection patch assembly shown is viewed along the X direction;

[0025] Figure 4This is a schematic diagram of the structure of a battery cell cover plate assembly in a sealed state when the explosion-proof valve protection patch assembly is in accordance with an embodiment of the present invention;

[0026] Figure 5 for Figure 4 Exploded view of the structure at the explosion-proof valve protection patch assembly;

[0027] Figure 6 for Figure 4 Top view of the cover plate assembly shown;

[0028] Figure 7 for Figure 4 The front view of the cover plate assembly shown;

[0029] Figure 8 for Figure 4 The diagram shown illustrates the structure of the cover plate assembly in the gap state of the explosion-proof valve protection patch assembly.

[0030] Figure 9 for Figure 8 Top view of the cover assembly shown.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10. Explosion-proof valve protective patch assembly; 1. Patch; 101. Main patch; 102. Auxiliary patch; 2. Adhesive layer; 201. Main adhesive layer; 202. Auxiliary adhesive layer; 3. Sealing layer; 20. Cover plate; 2001. Explosion-proof valve mounting hole; 30. Explosion-proof valve. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] For fully enclosed explosion-proof valve protection patches, the explosion-proof valve can be completely covered, effectively preventing electrolyte overflow during the cell filling process from contaminating the explosion-proof valve. However, if the explosion-proof valve cracks during the cell manufacturing process, helium detection will be affected and cannot be accurately detected, thus affecting the reliability of the explosion-proof valve's airtightness detection.

[0035] The following is combined Figures 1 to 9 The following describes embodiments of the present invention.

[0036] According to an embodiment of the present invention, in a first aspect, an explosion-proof valve protection patch assembly 10 is provided, which is attached to the explosion-proof valve mounting hole 2001 of the cover plate 20 of the battery cell. The explosion-proof valve protection patch assembly 10 includes a patch 1, an adhesive layer 2, and a sealing layer 3. The patch 1 includes a main patch 101 and an auxiliary patch 102. The patch 1 has a sealed state and a gap state. In the sealed state, the auxiliary patch 102 is spliced ​​with the main patch 101 to completely cover the explosion-proof valve mounting hole 2001. In the gap state, the auxiliary patch 102 is disassembled to create an exhaust gap between the main patch 101 and the explosion-proof valve mounting hole 2001. The adhesive layer 2 is disposed along the edge of the patch 1. The first adhesive surface of the adhesive layer 2 is bonded to the first surface of the patch 1 facing the cover plate 20, and the second adhesive surface of the adhesive layer 2 is adapted to be bonded to the cover plate 20. The sealing layer 3 is detachably disposed on the second surface of the patch 1 away from the cover plate 20 and seals the splicing gap between the main patch 101 and the auxiliary patch 102.

[0037] This utility model provides an explosion-proof valve protection patch assembly 10. Through its unique splicing patch structure, switchable sealing and gap states, and removable sealing layer 3, it achieves both protection and detection of the battery cell explosion-proof valve 30. The specific technical effects are as follows:

[0038] During the electrolyte filling process of the battery cell, the auxiliary patch 102 and the main patch 101 are spliced ​​together to form a complete covering layer. The explosion-proof valve 30 is sealed by the protective patch 1. The adhesive layer 2 is tightly bonded to the cover plate 20 of the battery cell. At the same time, the sealing layer 3 further seals the splicing gap between the main patch 101 and the auxiliary patch 102, which can effectively prevent electrolyte, dust and other corrosive substances from entering the interior of the explosion-proof valve 30, and avoid the explosion-proof valve 30 from becoming less sensitive or failing due to pollution or corrosion.

[0039] When the airtightness of the explosion-proof valve 30 and the cell end needs to be tested during battery production or maintenance, the auxiliary patch 102 can be removed to form an exhaust gap between the main patch 101 and the explosion-proof valve mounting hole 2001. This allows the test gas (such as helium) to freely enter the explosion-proof valve 30 area through the exhaust gap, avoiding the problem of gas flow obstruction and helium detection caused by the complete coverage of the traditional integral patch 1, thereby significantly improving the accuracy and reliability of airtightness testing.

[0040] This invention can solve the problem that current explosion-proof valve protective patches cannot simultaneously prevent electrolyte contamination of the explosion-proof valve 30 and ensure that airtightness testing is not affected.

[0041] The structure of the explosion-proof valve protection patch assembly 10 provided by this utility model in the cover plate assembly of the battery cell is as follows: Figures 4 to 9 As shown. Among them, Figures 4 to 7 In the structure shown, the explosion-proof valve protection patch assembly 10 is in a sealed state. Figure 8 and Figure 9In the structure shown, the explosion-proof valve protection patch assembly 10 is in a gap state.

[0042] The sealing state and the gap state can be flexibly switched by installing and removing the auxiliary patch 102, without replacing the entire explosion-proof valve protection patch assembly 10, which simplifies the battery production, testing and maintenance process.

[0043] The adhesive layer 2 is only provided along the edge of the patch 1, which can not only ensure the bonding and fixation between the patch 1 and the cover plate 20 of the cell, but also prevent the adhesive layer 2 from affecting the exhaust area of ​​the explosion-proof valve 30. This allows the explosion-proof valve protection patch assembly 10 to protect the explosion-proof valve 30 and ensure that the normal opening of the explosion-proof valve 30 is not affected. When applied to the cell, it can improve the safety and reliability of the cell.

[0044] In some embodiments, the adhesive layer 2 includes a main adhesive layer 201 corresponding to the main patch 101 and an auxiliary adhesive layer 202 corresponding to the auxiliary patch 102.

[0045] In some embodiments of this utility model, the adhesive layer 2 is divided into a main adhesive layer 201 and an auxiliary adhesive layer 202, adopting a split adhesive layer 2 design, that is, including a main adhesive layer 201 bonded to the main patch 101 and an auxiliary adhesive layer 202 bonded to the auxiliary patch 102, realizing independent bonding and disassembly of the main patch 101 and the auxiliary patch 102, improving operational flexibility.

[0046] Among them, the auxiliary patch 102 can be removed separately. During the airtightness test, the auxiliary patch 102 can be removed by peeling off the auxiliary adhesive layer 202 to achieve the gap state, while the main adhesive layer 201 still keeps the main patch 101 fixed to the cover plate 20, which plays a protective role for the explosion-proof valve 30.

[0047] The main adhesive layer 201 and the auxiliary adhesive layer 202 are only distributed on the edge of the patch 1, completely avoiding the pressure relief channel of the explosion-proof valve 30, thus avoiding the risk of the traditional integral adhesive layer 2 obstructing gas release by covering the explosion-proof valve 30.

[0048] In some embodiments, the thickness of the adhesive layer 2 is T, in mm, where 0.05 mm ≤ T ≤ 0.15 mm.

[0049] In some embodiments of this utility model, the thickness T of the adhesive layer 2 is limited to the range of 0.05mm to 0.15mm to ensure that the adhesive layer 2 has sufficient adhesive strength and can withstand vibration and temperature difference changes, thus ensuring the sealing performance of the patch 1 in a sealed state.

[0050] If T < 0.05 mm, the adhesive layer 2 is too thin, which may result in insufficient adhesive, leading to insufficient bonding strength between patch 1 and cover plate 20, and failure to fully fill the micro-unevenness (such as surface roughness or processing tolerance) between cover plate 20 and patch 1. This may easily create local unbonded areas, reduce sealing performance, pose a risk of electrolyte seepage, or result in low bonding strength, making patch 1 easy to peel off.

[0051] A layer 2 with a thickness T ≥ 0.05 mm can form a continuous and uniform bonding interface, effectively isolating external contaminants such as dust and electrolyte, while resisting thermal expansion stress during battery charging and discharging. The surface of the cover plate 20 may have micron-level unevenness or assembly deviations (such as stamping burrs or welding deformation). A layer 2 with a thickness T ≥ 0.05 mm possesses sufficient elastic deformation capacity, allowing it to adhere to irregular surfaces through localized compression or extension, preventing seal failure due to hard contact. Example: If the cover plate 20 has a localized depression of 0.03 mm, the adhesive layer 2 can fill the gap through elastic deformation, whereas a thickness T < 0.05 mm may not be able to fully compensate for this.

[0052] Although adhesive layer 2 needs to be of a certain thickness to ensure adhesion, if adhesive layer 2 is too thick (T>0.15mm), it may generate additional resistance when the explosion-proof valve 30 is opened, affecting the sensitivity of the explosion-proof valve 30.

[0053] In some embodiments, the bonding width between the main adhesive layer 201 and the cover plate 20 is W, in mm, where 0.5mm≤W≤1.2mm.

[0054] In some embodiments of this utility model, the bonding width W between the main adhesive layer 201 and the cover plate 20 is limited to the range of 0.5mm to 1.2mm. With W ≥ 0.5mm, the main adhesive layer 201 provides sufficient bonding area to ensure a firm connection between the main patch 101 and the cover plate 20, thus protecting the explosion-proof valve 30 and preventing external contaminants such as electrolyte and dust from seeping into the explosion-proof valve 30 and affecting its normal opening. Simultaneously, with W ≤ 1.2mm, limiting the width of the adhesive layer 2 reduces material usage and costs, while also preventing excessively wide adhesive layers 2 from generating internal stress due to thermal expansion / contraction, which could lead to warping of the patch 1 or cracking of the adhesive layer 2.

[0055] In some embodiments, the bonding area between the auxiliary adhesive layer 202 and the cover plate 20 is S1, in mm. 2 The area of ​​auxiliary patch 102 is S, in mm. 2 ,satisfy:

[0056] 0.2≤S1 / S≤0.4.

[0057] In some embodiments of this utility model, the bonding area S1 between the auxiliary adhesive layer 202 and the cover plate 20 accounts for 20% to 40% of the area S of the auxiliary patch 102, and S1 / S is greater than or equal to 0.2. This ensures the bonding strength between the auxiliary patch 102 and the cover plate 20, and in a sealed state, ensures the overall protective function of the patch 1 on the explosion-proof valve 30, preventing external contaminants such as electrolyte and dust from seeping into the explosion-proof valve 30. S1 / S is less than or equal to 0.4, which ensures the detachability of the auxiliary patch 102, so that it can be removed when performing airtightness testing of the battery cell, ensuring the accuracy of the airtightness test. At the same time, it ensures that the auxiliary adhesive layer 202 does not occupy the pressure relief channel of the explosion-proof valve 30, ensuring the normal opening and pressure relief of the explosion-proof valve 30.

[0058] In some embodiments, the surface of the sealing layer 3 facing away from the patch 1 has color-enhancing features to improve visual recognition.

[0059] By providing color-changing features on the surface of the sealing layer 3 facing away from the patch 1 to improve visual visibility, it is ensured that any detachment of the sealing layer 3 can be detected promptly, allowing for timely remedial measures. For example, the color-changing features can be fluorescent, warning, or colors that create high contrast with surrounding components.

[0060] In some embodiments, the bonding area between the sealing layer 3 and the auxiliary patch 102 is S2, in mm. 2 The area of ​​auxiliary patch 102 is S, in mm. 2 ,satisfy:

[0061] 0.7≤S2 / S≤0.9.

[0062] In this embodiment, the bonding area between the sealing layer 3 and the auxiliary patch 102 accounts for at least 70% of the area of ​​the auxiliary patch 102. This ensures sufficient adhesion between the sealing layer 3 and the auxiliary patch 102, allowing the sealing layer 3 to be peeled off along with the auxiliary patch 102 during helium testing. The bonding area between the sealing layer 3 and the auxiliary patch 102 accounts for at most 90% of the area of ​​the auxiliary patch 102; otherwise, the bonding area between the sealing layer 3 and the main patch 101 will be too small, resulting in weak adhesion and affecting the sealing performance.

[0063] In some embodiments, the sealing layer 3 is made of an insulating material that is resistant to electrolyte corrosion.

[0064] The sealing layer 3 is made of insulating material, which can ensure the insulation performance of the battery cell. At the same time, since the sealing layer 3 is located on the outside of the explosion-proof valve protection patch assembly 10, it may come into contact with the overflowing electrolyte during the electrolyte injection process. The sealing layer 3 is made of a material that is resistant to electrolyte corrosion, which can ensure that the sealing performance of the sealing layer 3 is not affected.

[0065] In some embodiments, the sealing layer 3 includes adhesive tape.

[0066] In some embodiments, projected along the thickness direction of the cover plate 20, the main patch 101 covers 80% to 95% of the opening area of ​​the explosion-proof valve mounting hole 2001.

[0067] When the main patch 101 covers ≥80% of the opening area of ​​the explosion-proof valve mounting hole 2001, it ensures that the main patch 101 can protect the explosion-proof valve 30 and buffer external mechanical impact.

[0068] When the main patch 101 covers ≤95% of the opening area of ​​the explosion-proof valve mounting hole 2001, it ensures that at least 5% of the valve hole area is directly exposed, which can reduce the airflow resistance at the moment of explosion.

[0069] In some embodiments, the splicing edge between the main patch 101 and the auxiliary patch 102 is a straight edge.

[0070] This design facilitates processing, the splicing of the main patch 101 and the auxiliary patch 102, and the assembly of the sealing layer 3.

[0071] According to an embodiment of the present invention, in a second aspect, a battery cell is also provided, including a cover plate 20 and an explosion-proof valve protection patch assembly 10 of any of the above embodiments. The cover plate 20 includes an explosion-proof valve mounting hole 2001 and an explosion-proof valve 30 disposed within the explosion-proof valve mounting hole 2001; the explosion-proof valve protection patch assembly 10 is attached to the outside of the explosion-proof valve mounting hole 2001 and covers the explosion-proof valve 30.

[0072] Since the battery cell includes the explosion-proof valve protection patch assembly 10, it has all the technical effects of the explosion-proof valve protection patch assembly 10, which will not be elaborated here.

[0073] According to an embodiment of the present invention, in a third aspect, a battery pack is also provided, including the battery cells described in the above embodiments.

[0074] Since the battery pack includes the battery cells and has all the technical benefits of the battery cells, it will not be elaborated here.

[0075] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An explosion-proof valve protection patch assembly, attached to the explosion-proof valve mounting hole of the cover plate of a battery cell, characterized in that, include: The patch includes a main patch and an auxiliary patch; the patch includes a sealed state and a gap state, wherein in the sealed state, the auxiliary patch is spliced ​​with the main patch to seal the explosion-proof valve mounting hole; in the gap state, the auxiliary patch is disassembled to create an exhaust gap between the main patch and the explosion-proof valve mounting hole; An adhesive layer is provided along the edge of the patch, a first adhesive surface of the adhesive layer is bonded to a first surface of the patch facing the cover plate, and a second adhesive surface of the adhesive layer is adapted to bond to the cover plate; A sealing layer is detachably disposed on the second surface of the patch away from the cover plate and seals the splicing gap between the main patch and the auxiliary patch.

2. The explosion-proof valve protection patch assembly according to claim 1, characterized in that, The adhesive layer includes a main adhesive layer corresponding to the main patch and an auxiliary adhesive layer corresponding to the auxiliary patch.

3. The explosion-proof valve protection patch assembly according to claim 2, characterized in that, The thickness of the adhesive layer is T, in mm, where 0.05 mm ≤ T ≤ 0.15 mm.

4. The explosion-proof valve protection patch assembly according to claim 2 or 3, characterized in that, The bonding width between the main adhesive layer and the cover plate is W, in mm, where 0.5mm ≤ W ≤ 1.2mm.

5. The explosion-proof valve protection patch assembly according to claim 2 or 3, characterized in that, The bonding area between the auxiliary adhesive layer and the cover plate is S1, in mm. 2 The area of ​​the auxiliary patch is S, in mm. 2 ,satisfy: 0.2≤S1 / S≤0.

4.

6. The explosion-proof valve protection patch assembly according to any one of claims 1 to 3, characterized in that, The surface of the sealing layer facing away from the patch has color-changing features to improve visual recognition.

7. The explosion-proof valve protection patch assembly according to any one of claims 1 to 3, characterized in that, The bonding area between the sealing layer and the auxiliary patch is S2, in mm. 2 The area of ​​the auxiliary patch is S, in mm. 2 ,satisfy: 0.7≤S2 / S≤0.

9.

8. The explosion-proof valve protection patch assembly according to any one of claims 1 to 3, characterized in that, Projected along the thickness direction of the cover plate, the main patch covers 80% to 95% of the opening area of ​​the explosion-proof valve mounting hole.

9. A battery cell, characterized in that, include: A cover plate, the cover plate including an explosion-proof valve mounting hole and an explosion-proof valve disposed in the explosion-proof valve mounting hole; The explosion-proof valve protective patch assembly according to any one of claims 1 to 8, wherein the explosion-proof valve protective patch assembly is attached to the outside of the explosion-proof valve mounting hole and covers the explosion-proof valve.

10. A battery pack, characterized in that, Includes the battery cell described in claim 9.

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