Cell cover assembly, cell and battery pack

Abstract

This invention relates to the field of battery technology, and discloses a cell cover assembly, a cell, and a battery pack. The cell cover assembly includes a cover body, an explosion-proof valve, and an explosion-proof valve protective patch. The cover body has an explosion-proof valve mounting hole and an injection hole; the explosion-proof valve is located in the explosion-proof valve mounting hole; the explosion-proof valve protective patch is located on the first surface of the cover body away from the cell electrode assembly, completely covering the explosion-proof valve mounting hole, and has a detection gas channel, which is an elongated structure arranged along the width direction of the cover body; the total dimension of the detection gas channel along the width direction of the cover body is L1, and the dimension of the explosion-proof valve protective patch at the detection gas channel along the width direction of the cover body is L, satisfying: 0.12≤L1 / L≤0.25. This invention can ensure the accuracy of helium detection, ensuring that damage to the explosion-proof valve can be detected, and can also block the overflow of electrolyte, effectively preventing the explosion-proof valve from being contaminated or corroded by the electrolyte.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to cell cover assemblies, cells, and battery packs. Background Technology

[0002] Lithium-ion batteries are widely used in various fields such as transportation power supply, power storage, new energy storage power supply, aerospace and military industry due to their advantages such as large capacity, high operating voltage, strong charge retention capability and long cycle life.

[0003] A typical lithium-ion battery structure includes: a cover plate, a casing, electrode assembly, electrolyte, bare cell insulating sheet, insulating tape, and a cover plate top cover patch. The cover plate connects to the casing, providing a sealed space with sufficient strength to protect the electrode assembly. The cover plate usually integrates electrode terminals, electrolyte filling holes, and explosion-proof valves. The explosion-proof valve, as a critical pressure relief port, plays a vital role in preventing thermal runaway and thermal propagation in individual cells and the entire battery pack. When the cover plate is supplied, an explosion-proof valve protective patch is usually affixed to the explosion-proof valve location.

[0004] The battery cell manufacturing process involves multiple helium testing steps to check the cell's sealing performance. Because explosion-proof valves are protected by protective patches, a through-hole is typically left in the patch to prevent damage to the valve from going undetected by helium testing. However, during battery cell manufacturing, especially in processes like electrolyte injection and pre-charging, electrolyte often overflows. This overflowing electrolyte can enter the explosion-proof valve through the gap in the protective patch, causing contamination, corrosion, or even leakage. The protective patch itself, contaminated with electrolyte, is also prone to detachment, posing a significant threat to the battery cell's safety performance. Summary of the Invention

[0005] In view of this, the present invention provides a cell cover plate assembly, a cell, and a battery pack to solve the problem that the notch set in the explosion-proof valve protection patch to meet helium detection requirements cannot prevent the overflowing electrolyte from entering the explosion-proof valve, thus causing the explosion-proof valve to be contaminated and the explosion-proof valve protection patch to easily fall off.

[0006] In a first aspect, the present invention provides a battery cell cover assembly, including a cover body, an explosion-proof valve, and an explosion-proof valve protective patch. The cover body has an explosion-proof valve mounting hole and a liquid injection hole; the explosion-proof valve is disposed within the explosion-proof valve mounting hole; the explosion-proof valve protective patch is disposed on a first surface of the cover body away from the battery cell electrode assembly, the explosion-proof valve protective patch completely covers the explosion-proof valve mounting hole, and the explosion-proof valve protective patch has a detection gas passage for a detection gas to pass through. The detection gas passage is an elongated structure arranged along the width direction of the cover body; the total dimension of the detection gas passage along the width direction of the cover body is L1 (mm), and the dimension of the explosion-proof valve protective patch at the detection gas passage along the width direction of the cover body is L (mm), satisfying:

[0007] 0.12≤L1 / L≤0.25.

[0008] Beneficial effects: This invention adopts a long strip-shaped detection gas channel. At the same time, the ratio of the total size L1 of the detection gas channel to the size L of the explosion-proof valve protective patch at the detection gas channel is controlled within the range of 0.12 to 0.25. This ensures the passage of helium gas during the helium detection process, guarantees the accuracy of the helium detection, and ensures that any damage to the explosion-proof valve can be detected by helium detection with 100% accuracy. It also forms a physical barrier to block the overflow of electrolyte, effectively preventing the explosion-proof valve from being contaminated or corroded by the electrolyte.

[0009] This invention significantly reduces the probability of electrolyte contamination of the explosion-proof valve protection patch and the explosion-proof valve itself by changing the structure, position, and size of the helium detection port on the explosion-proof valve film commonly used in the industry. It also ensures that the problem of whether the explosion-proof valve is damaged can be detected normally, greatly improving the appearance of the finished battery cell, reducing production costs, and improving the safety performance of the battery cell and the entire package.

[0010] In one optional embodiment, along the width direction of the cover plate body, the detection airway includes n equally long slits spaced at intervals, and the size of the slits along the width direction of the cover plate body is s, in mm, and L1 = s × n.

[0011] In one optional embodiment, the distance between the detection air passage and the edge of the explosion-proof valve on the corresponding side along the length direction of the cover plate body is c, in mm, where 1mm≤c≤4mm.

[0012] In one optional embodiment, the size of the explosion-proof valve mounting hole is A1 (mm) along the length of the cover plate body, and B1 (mm) along the width of the cover plate body. The size of the explosion-proof valve protective patch is A2 (mm) along the length of the cover plate body, and B2 (mm) along the width of the cover plate body, satisfying the following:

[0013] 1.5mm≤A2-A1≤4mm

[0014] 1.5mm≤B2-B1≤4mm.

[0015] In one alternative implementation, the slit is formed by cutting, and the area of ​​the explosion-proof valve protection patch remains unchanged before and after cutting.

[0016] In one alternative embodiment, n slits are located on the same side of the explosion-proof valve protective patch, or n slits are distributed on both sides of the explosion-proof valve protective patch.

[0017] In one alternative implementation, the explosion-proof valve protection patch is made of an insulating material that is resistant to electrolyte corrosion.

[0018] In one optional embodiment, the explosion-proof valve protection patch includes a patch body and an adhesive layer. The adhesive layer is disposed on the surface of the patch body facing the cover plate body and located at the edge of the patch body. The patch body is fixedly connected to the cover plate body through the adhesive layer.

[0019] Secondly, the present invention also provides a battery cell, including a housing, an electrode assembly, and a battery cell cover plate assembly according to any one of the above technical solutions. The housing has a receiving cavity and an open end communicating with the receiving cavity; the electrode assembly is disposed in the receiving cavity of the housing; the battery cell cover plate assembly is disposed at the open end of the housing and seals the electrode assembly in the receiving cavity.

[0020] Beneficial effects: Since the battery cell includes the battery cell cover assembly, it has all the technical effects of the battery cell cover assembly, which will not be elaborated here.

[0021] Thirdly, the present invention also provides a battery pack, including the battery cells described in the above technical solutions.

[0022] 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

[0023] To more clearly illustrate the specific embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a top view of a battery cell cover assembly in the related art;

[0025] Figure 2 This is a top view of another cell cover assembly in the related technology;

[0026] Figure 3 This is a top view of a negative terminal cell cover assembly according to an embodiment of the present invention;

[0027] Figure 4 for Figure 3 A magnified view of a section at point J;

[0028] Figure 5 This is a top view of a positive terminal cell cover assembly according to an embodiment of the present invention;

[0029] Figure 6 for Figure 3 The diagram shows the structure of a battery cell composed of a battery cell cover assembly.

[0030] Figure 7 for Figure 5 The diagram shows the structure of a battery cell composed of a battery cell cover assembly.

[0031] Figure 1 and Figure 2 Explanation of reference numerals in the attached figures:

[0032] 301', Helium detection port.

[0033] Figures 3 to 7 Explanation of reference numerals in the attached figures:

[0034] 1. Cover plate body; 101. Explosion-proof valve mounting hole; 102. Liquid injection hole; 2. Explosion-proof valve; 3. Explosion-proof valve protective patch; 301. Detection gas passage; 4. Electrode post; 10. Battery cell cover plate assembly; 20. Housing. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] The battery cell manufacturing process involves multiple helium testing steps to check the cell's sealing performance. Because an explosion-proof valve protective patch is affixed to the explosion-proof valve location, a through-hole is typically provided on the protective patch as a helium testing port 301' to prevent detection failure in case of damage to the valve. (Refer to...) Figure 1 and Figure 2 However, during the cell manufacturing process, especially in processes such as electrolyte injection and pre-charging, electrolyte often overflows. The overflowing electrolyte can enter the explosion-proof valve through the gaps on the explosion-proof valve protection patch, causing the explosion-proof valve to be contaminated, corroded, or even leaking. The explosion-proof valve protection patch 3 is also prone to falling off after being contaminated by electrolyte, posing a great threat to the safety performance of the cell.

[0037] To solve the above-mentioned technical problems, the present invention provides a cell cover plate assembly 10, a cell and a battery pack, which can effectively avoid the problems of contamination of the explosion-proof valve 2 and detachment of the explosion-proof valve protection patch 3 due to gaps in the explosion-proof valve protection patch 3, thereby improving the cell manufacturing yield and safety performance.

[0038] The following is combined Figures 3 to 7 The following describes embodiments of the present invention.

[0039] According to an embodiment of the present invention, in a first aspect, a battery cell cover assembly 10 is provided, including a cover body 1, an explosion-proof valve 2, and an explosion-proof valve protection patch 3. The cover body 1 has an explosion-proof valve mounting hole 101 and an injection hole 102; the explosion-proof valve 2 is disposed within the explosion-proof valve mounting hole 101; the explosion-proof valve protection patch 3 is disposed on a first surface of the cover body 1 away from the battery cell electrode assembly, the explosion-proof valve protection patch 3 completely covers the explosion-proof valve mounting hole 101, and the explosion-proof valve protection patch 3 has a detection gas channel 301 for the passage of detection gas. The detection gas channel 301 is an elongated structure arranged along the width direction of the cover body 1; the total dimension of the detection gas channel 301 along the width direction of the cover body 1 is L1 (mm), and the dimension of the explosion-proof valve protection patch 3 at the detection gas channel 301 along the width direction of the cover body 1 is L (mm), satisfying:

[0040] 0.12≤L1 / L≤0.25.

[0041] This invention employs a long, strip-shaped detection channel 301. Simultaneously, the ratio of the total dimension L1 of the detection channel 301 to the dimension L of the explosion-proof valve protective patch 3 at the detection channel 301 is controlled within the range of 0.12 to 0.25. This ensures both the permeability of helium gas during helium detection and the accuracy of the helium detection, guaranteeing 100% detection of any damage to the explosion-proof valve 2. Furthermore, it forms a physical barrier to block overflowing electrolyte, effectively preventing contamination or corrosion of the explosion-proof valve 2 by the electrolyte.

[0042] This invention significantly reduces the probability of electrolyte contamination of the explosion-proof valve protection patch 3 and the explosion-proof valve 2 during the battery cell manufacturing process by changing the structure, position, and size of the helium detection port on the explosion-proof valve 2 film, which is commonly used in the industry. At the same time, it can ensure that the problem of whether the explosion-proof valve 2 is damaged can be detected normally, which greatly improves the appearance rationality of the finished battery cell, reduces production costs, and improves the safety performance of the battery cell and the whole package.

[0043] In some embodiments, along the width direction of the cover plate body 1, the detection airway 301 includes n equally long slits spaced apart. The size of the slits along the width direction of the cover plate body 1 is s, with the unit being mm, and L1 = s × n.

[0044] In this embodiment, n equally spaced slits of equal length are used instead of a single long slit, and L1 = s × n is satisfied to ensure that the total ventilation volume of the detection airway 301 remains unchanged, and that the helium permeability is comparable to that of the traditional scheme. The dimension s of a single slit along the width direction of the cover plate body 1 is small. If the overflowing electrolyte reaches the slit, it needs to overcome a higher surface tension to penetrate. Compared with a single long slit, the penetration difficulty is greatly increased, effectively preventing electrolyte contamination of the explosion-proof valve 2.

[0045] The gaps between multiple slits can block the continuous flow of electrolyte and reduce the electrolyte penetration rate.

[0046] The dispersed slit structure reduces stress concentration, making the protective patch less prone to breakage when bent or subjected to pressure.

[0047] In some embodiments, along the length of the cover plate body 1, the distance between the detection air passage 301 and the edge of the corresponding explosion-proof valve 2 is c, in mm, where 1 mm ≤ c ≤ 4 mm.

[0048] By controlling the distance c between the detection air passage 301 and the edge of the corresponding explosion-proof valve 2 within the range of 1mm to 4mm, it is possible to ensure that the detection air passage 301 is not too close to the edge of the explosion-proof valve 2 and thus not blocked by the adhesive layer, thereby ensuring the unobstructed flow of the detection air passage 301. At the same time, it is also possible to ensure that the detection air passage 301 is not too close to the center of the explosion-proof valve protective patch 3 and thus not cause the explosion-proof valve protective patch 3 to collapse, thereby ensuring the strength of the explosion-proof valve 2 protective patch and preventing tearing.

[0049] In some embodiments, the size of the explosion-proof valve mounting hole 101 along the length direction of the cover plate body 1 is A1 (mm), the size of the explosion-proof valve mounting hole 101 along the width direction of the cover plate body 1 is B1 (mm), the size of the explosion-proof valve protective patch 3 along the length direction of the cover plate body 1 is A2 (mm), and the size of the explosion-proof valve protective patch 3 along the width direction of the cover plate body 1 is B2 (mm), satisfying:

[0050] 1.5mm≤A2-A1≤4mm

[0051] 1.5mm≤B2-B1≤4mm.

[0052] In the embodiments of the present invention, ensuring that A2-A1≥1.5mm and B2-B1≥1.5mm ensures that the explosion-proof valve protective patch 3 has sufficient edge coverage around the explosion-proof valve mounting hole 101. Even if there are assembly tolerances (such as the explosion-proof valve protective patch 3 pasting offset ±0.5mm), it can still completely cover the explosion-proof valve mounting hole 101, preventing external dust, liquid or mechanical collisions from directly acting on the explosion-proof valve 2, and thus protecting the explosion-proof valve 2.

[0053] At the same time, it can provide sufficient bonding area for the adhesive layer between the explosion-proof valve protective patch 3 and the cover plate body 1, avoid local stress concentration and delamination due to insufficient coverage, and ensure sufficient bonding strength between the explosion-proof valve protective patch 3 and the cover plate body 1.

[0054] In the embodiments of the present invention, A2-A1≤4mm and B2-B1≤4mm are ensured to limit the redundancy of patch size, avoid excessive coverage and occupation of space in other functional areas on the cover plate body 1, such as injection hole 102 and pole post 4, and ensure the overall layout is compact.

[0055] At the same time, reasonably limiting the size of the patch can avoid material waste, especially when the patch uses high-cost materials, such as polyimide that is resistant to electrolyte corrosion.

[0056] In some embodiments, the gap is formed by cutting, and the area of ​​the explosion-proof valve protection patch 3 remains unchanged before and after cutting.

[0057] The area of ​​the explosion-proof valve protective patch 3 remains unchanged before and after cutting. This means the gap is formed by internal material division rather than material removal; it's merely a small cut. This ensures normal helium passage during helium testing, while preventing electrolyte from entering the explosion-proof valve 2 through the protective patch 3 and contaminating it. Furthermore, by not removing material, the overall strength of the protective patch 3 is maintained, preserving its impact and deformation resistance.

[0058] In some embodiments, n gaps are located on the same side of the explosion-proof valve protective patch 3, or n gaps are distributed on both sides of the explosion-proof valve protective patch 3.

[0059] In some embodiments, the explosion-proof valve protection patch 3 is made of an insulating material that is resistant to electrolyte corrosion.

[0060] The explosion-proof valve protection patch 3 is made of insulating material, which can effectively prevent battery short circuits, especially in high-voltage or high-capacity battery systems, and avoid safety hazards caused by contact with conductive materials.

[0061] Meanwhile, the explosion-proof valve protection patch 3 is made of a material resistant to electrolyte corrosion, which ensures that the explosion-proof valve protection patch 3 can maintain its structural integrity and functionality even when in contact with electrolyte, and will not fail due to corrosion, thus ensuring that it plays a reliable protective role for the explosion-proof valve 2.

[0062] In some embodiments, the explosion-proof valve protection patch 3 includes a patch body and an adhesive layer. The adhesive layer is disposed on the surface of the patch body facing the cover plate body 1 and located at the edge of the patch body. The patch body is fixedly connected to the cover plate body 1 through the adhesive layer.

[0063] The explosion-proof valve protective patch 3 is connected to the surface of the cover plate body 1 through an adhesive layer. The adhesive layer can ensure a firm bond between the patch body and the cover plate body 1, and prevent the patch body from loosening or falling off due to vibration, impact or temperature changes.

[0064] The adhesive layer is located at the edge of the patch body and is fixedly connected to the cover plate body 1, which can ensure the connection strength between the patch body and the cover plate body 1, and will not occupy the pressure relief channel of the explosion-proof valve 2.

[0065] In addition, the adhesive layer not only serves a fixing function, but also forms a good sealing interface to prevent electrolyte or other substances from seeping into the explosion-proof valve mounting hole 101, ensuring that the explosion-proof valve 2 is not contaminated or corroded.

[0066] To verify the technical effect of the present invention, specific test cases are provided below. The tested product is a battery cell. Helium testing was performed on each case to check for leaks. Specifically, the battery cell was placed in a sealed cavity, the cavity was first evacuated, and then helium was injected into the battery cell through the injection port. If the explosion-proof valve 2 of the battery cell was damaged, helium leaked into the sealed cavity outside the battery cell, thus being detected. For each batch of battery cells in the following test cases, helium testing was performed. Cells that failed the helium test were removed to confirm whether the explosion-proof valve 2 was damaged. The number of battery cells with damaged explosion-proof valve 2 detected by the helium test was recorded as n1. Battery cells that passed the helium test flowed to subsequent processes. The number of battery cells with damaged explosion-proof valve 2 detected in subsequent processes was counted and recorded as n2. The helium detection rate = n1 / (n1+n2).

[0067] In addition, the tests verified whether electrolyte seeped into the explosion-proof valve 2 when it dripped onto the surface of the explosion-proof valve protective patch 3, and whether the explosion-proof valve protective patch 3 detached. The test results are detailed in Table 1.

[0068] Table 1

[0069]

[0070] In test cases 1 and 11, the L1 / L value was less than 0.12, the detection gas channel 301 was too short, and there was a case where the explosion-proof valve 2 was damaged and the helium detection failed to detect it, which did not meet the requirements for battery cell use.

[0071] In test cases 10 and 17, the L1 / L value was greater than 0.25, indicating that the detection channel 301 was too long. Helium detection could detect the damage when the explosion-proof valve 2 was damaged. However, due to the excessive length of the detection channel 301, electrolyte seeped into the explosion-proof valve 2 when it dripped onto the surface of the explosion-proof valve protection patch 3. The explosion-proof valve protection patch 3 had a problem of falling off, which did not meet the requirements for battery cell use.

[0072] In the remaining test cases, the L1 / L value was between 0.12 and 0.25. When the explosion-proof valve 2 was damaged, the helium detection rate was 100%. When the electrolyte dripped onto the surface of the explosion-proof valve protective patch 3, no electrolyte seeped into the explosion-proof valve 2. The explosion-proof valve protective patch 3 did not have any problem of falling off. All of these met the requirements for the use of the battery cell.

[0073] As shown in Table 1, the ratio of the total dimension L1 of the detection channel 301 to the dimension L of the explosion-proof valve protection patch 3 at the detection channel 301 must satisfy: 0.12 ≤ L1 / L ≤ 0.25. If L1 / L < 0.12, the helium flow resistance is too high, affecting the accuracy of helium detection; if L1 / L > 0.25, the electrolyte is prone to forming a continuous liquid film that permeates into the explosion-proof valve 2, causing contamination or corrosion, and there is also the problem of the explosion-proof valve 2 falling off. By setting the detection channel 301 and limiting the ratio of the total dimension L1 of the detection channel 301 to the dimension L of the explosion-proof valve protection patch 3 at the detection channel 301, this invention can greatly improve the yield of the battery cell and subsequent processes, the reasonableness of the battery cell appearance, and the safety performance of the battery cell and the entire package.

[0074] According to an embodiment of the present invention, in a second aspect, a battery cell is also provided, including a housing 20, an electrode assembly, and a battery cell cover assembly 10 of any of the above embodiments. The housing 20 has a receiving cavity and an open end communicating with the receiving cavity; the electrode assembly is disposed in the receiving cavity of the housing 20; the battery cell cover assembly 10 is disposed at the open end of the housing 20, sealing the electrode assembly in the receiving cavity.

[0075] The electrode assembly is covered with a bare cell insulating sheet, which protects the electrode assembly and prevents internal short circuits caused by contact between the electrode assembly and the housing 20. The housing 20 is also covered with insulating tape to provide external insulation for the cell housing 20.

[0076] Since the battery cell includes the battery cell cover assembly 10, it has all the technical effects of the battery cell cover assembly 10, which will not be described in detail here.

[0077] According to an embodiment of the present invention, a third aspect also provides a battery pack including the battery cells described in the above embodiments.

[0078] Since the battery pack includes the battery cells and has all the technical benefits of the battery cells, it will not be elaborated here.

[0079] Although embodiments of the 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 invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cell cover assembly, characterized in that, include: The cover plate body is provided with an explosion-proof valve mounting hole and a liquid injection hole; An explosion-proof valve, wherein the explosion-proof valve is disposed within the explosion-proof valve mounting hole; An explosion-proof valve protection patch is provided on the first surface of the cover plate body away from the battery cell electrode group. The explosion-proof valve protection patch completely covers the explosion-proof valve mounting hole. The explosion-proof valve protection patch is provided with a detection gas channel for the detection gas to pass through. The detection gas channel is a long strip structure arranged along the width direction of the cover plate body. Along the width direction of the cover plate body, the total dimension of the detection air passage is L1, in mm. Along the width direction of the cover plate body, the dimension of the explosion-proof valve protective patch at the detection air passage is L, in mm. satisfy: 0.12≤L1 / L≤0.25; Along the width direction of the cover plate body, the detection air passage includes n equally long slits spaced at intervals. Along the width direction of the cover plate body, the size of the slit is s, in mm, L1=s×n; Along the length of the cover plate body, the distance between the detection air passage and the edge of the explosion-proof valve on the corresponding side is c, in mm, where 1mm≤c≤4mm.

2. The cell cover assembly according to claim 1, characterized in that, Along the length of the cover plate body, the size of the explosion-proof valve mounting hole is A1, in mm. Along the width direction of the cover plate body, the size of the explosion-proof valve mounting hole is B1, in mm. Along the length of the cover plate body, the size of the explosion-proof valve protective patch is A2, in mm. Along the width direction of the cover plate body, the size of the explosion-proof valve protective patch is B2, in mm. satisfy: 1.5mm≤A2-A1≤4mm 1.5mm≤B2-B1≤4mm.

3. The cell cover assembly according to claim 1, characterized in that, The gap is formed by cutting, and the area of ​​the explosion-proof valve protective patch remains unchanged before and after cutting.

4. The cell cover assembly according to claim 1 or 3, characterized in that, The n gaps are located on the same side of the explosion-proof valve protective patch, or the n gaps are distributed on both sides of the explosion-proof valve protective patch.

5. The cell cover assembly according to claim 1, characterized in that, The explosion-proof valve protective patch is made of an insulating material that is resistant to electrolyte corrosion.

6. The cell cover assembly according to claim 1, characterized in that, The explosion-proof valve protective patch includes a patch body and an adhesive layer. The adhesive layer is disposed on the surface of the patch body facing the cover plate body and located at the edge of the patch body. The patch body is fixedly connected to the cover plate body through the adhesive layer.

7. A battery cell, characterized in that, include: A housing having a receiving cavity and an open end communicating with the receiving cavity; The electrode assembly is disposed within the receiving cavity of the housing; The cell cover assembly according to any one of claims 1 to 6, wherein the cell cover assembly is disposed at the open end of the housing and seals the electrode assembly within the receiving cavity.

8. A battery pack, characterized in that, Includes the battery cell described in claim 7.

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