Battery cell and battery pack

Abstract

A battery cell and a battery pack. The battery cell comprises a casing (10), a first cover plate (20), a pressure relief member (40), a separator (50), and an electrode group (70), wherein the first cover plate (20) is provided with a plurality of protruding support portions (21); the pressure relief member (40) is mounted on the first cover plate (20) and is spaced apart from the separator (50); the separator (50) is connected to the support portions (21); the total contact area between the support portions (21) and the separator (50) is S1, and the area of the side of the separator (50) facing the support portions (21) is S2; the area of the pressure relief member (40) is S0; when S0≤100 mm2, the support portions (21) are located at four corners of the separator (50), and S1 / S2≥1 / 5; when S0>100 mm2, two support portions (21) are arranged at two ends of the separator (50) in the length direction, and two support portions (21) are arranged at two ends of the separator (50) in the width direction; the total contact area between the two support portions (21) in the width direction and the separator (50) is S11, and the total contact area between the two support portions (21) in the length direction and the separator (50) is S12; S11+S12=S1, S11 / S12>1.3, and S1 / S2>1 / 4. By means of the specific size setting, it can be ensured that the separator (50) has sufficient strength to support the electrode group (70), thereby avoiding insufficient exhaust area caused by deformation of the separator (50), thus improving the safety performance of the battery cell.

Description

Battery cells and battery packs

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese Patent Application No. CN202411916062.7, filed on December 24, 2024, entitled "Battery Cell and Battery Pack", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a battery cell and battery pack. Background Technology

[0004] Lithium-ion batteries are currently the most widely used rechargeable batteries. Multiple lithium-ion batteries connected in series or parallel form a lithium-ion battery pack, which can be used as an energy storage device for electric vehicles. The thermal runaway problem of lithium-ion batteries is a key issue restricting the industrialization of the electric vehicle industry. Thermal runaway of a single cell can lead to thermal propagation, thereby causing safety problems for the module, battery pack, and even the entire vehicle containing the thermally runaway battery.

[0005] As shown in Figure 1, the long-cell lithium-ion battery has a cover plate 1 and a shell 2 forming a sealed space to protect the electrode assembly 3; the tabs on the electrode assembly 3 are welded and fixed to the posts on the cover plate 1; the bare cell insulating film 4 wraps around the electrode assembly and is heat-fused to the lower plastic 5 on both sides of the cover plate 1, thereby ensuring the isolation and insulation between the electrode assembly 3 and the shell 2 and the cover plate 1; the explosion-proof valve 6 on the cover plate 1 can directionally discharge the high-temperature and high-pressure gas inside the battery when thermal runaway occurs due to internal short circuit.

[0006] Currently, the high-temperature resistance of the insulating materials in the battery cell is far lower than the temperature at which thermal runaway occurs. During thermal runaway, the thermally fused fixing structure and insulating components in the battery cell melt and fail, leading to an increase in the gap between the electrode assembly and the cover plate and shell. This results in a high degree of freedom for the electrode assembly inside the battery cell. As the high-temperature and high-pressure gas is vented directionally towards the direction where the explosion-proof valve is installed, the electrode assembly will move with the high-temperature and high-pressure gas flow and block the explosion-proof valve on the cover plate, reducing the venting effect and venting rate of the explosion-proof valve, thereby affecting the safety performance of the battery cell and battery pack.

[0007] Application content

[0008] In view of this, the purpose of this application is to provide a battery cell and battery pack to solve the problem that the insulating components in the battery cell are prone to melting during thermal runaway, which causes the electrode assembly to move with the high temperature and high pressure airflow and block the explosion-proof valve on the cover plate, reducing the venting effect of the explosion-proof valve and thus reducing the safety performance of the battery cell and battery pack.

[0009] In a first aspect, this application provides a battery cell, wherein the battery cell comprises:

[0010] case;

[0011] A first cover plate is installed on the housing, and a plurality of protruding support portions are formed on the side of the first cover plate facing the inside of the cell;

[0012] A pressure relief component is installed on the first cover plate, and a plurality of the support portions are spaced apart around the pressure relief component, wherein the area of ​​the pressure relief component is S0;

[0013] A separator is connected to the support portion, such that the separator and the pressure relief component are spaced apart, and the separator is formed into a long strip plate-like structure;

[0014] The total contact area between the support and the partition is S1, and the area of ​​the outer edge of the partition facing the support is S2.

[0015] When S0≤100mm 2 When the support portion is located at the four corners of the separator, S1 / S2≥1 / 5;

[0016] When S0 > 100mm 2 At the same time, the two support parts are disposed at both ends of the partition in the length direction and at both ends of the partition in the width direction; the total contact area between the two support parts disposed at both ends of the partition in the width direction and the partition is S11, and the total contact area between the two support parts disposed at both ends of the partition in the length direction and the partition is S12, S11+S12=S1; S11 / S12>1.3, S1 / S2>1 / 4.

[0017] Beneficial effects: Multiple support sections are spaced around the pressure relief component, and the separator is connected to the support sections. This spacing between the separator and the pressure relief component ensures that even if the electrode assembly shifts inside the battery cell during thermal runaway, the separator can prevent the electrode assembly from obstructing or blocking the pressure relief component. It also prevents internal combustion materials from splashing outwards during thermal runaway. Gas inside the battery cell can flow from the area enclosed by the support sections and separator to the pressure relief component, ensuring smooth venting and improving the safety performance of the battery cell. Specific dimensional settings ensure that the separator has the strength to reliably and effectively support the electrode assembly and resist the impact of internal airflow within the battery cell. This prevents high-temperature, high-pressure gas from causing the electrode assembly to deform the separator or reducing the distance between the separator and the first cover plate, resulting in insufficient venting area, thus improving the safety performance of the battery cell and battery pack.

[0018] In one alternative embodiment, the separator is welded to the support to form a welded portion.

[0019] In one optional embodiment, the total area of ​​the welded portion is S3, where S3 / S1 > 1 / 2;

[0020] And / or, the weld penetration depth between the separator and the support is greater than 0.3 mm.

[0021] In one alternative embodiment, the separator is connected to a surface of the support portion away from the first cover plate;

[0022] The separator is arranged parallel to the first cover plate.

[0023] In one optional embodiment, the height dimension of the support portion in the thickness direction of the first cover plate is H, where 1mm ≤ H ≤ 2.5mm.

[0024] In one optional embodiment, the separator has a first air vent; the first air vent and the pressure relief member are arranged opposite to each other in the thickness direction of the first cover plate.

[0025] In one alternative implementation, it further includes:

[0026] An insulating protective component is disposed on the side of the separator facing the inside of the battery cell, and a second vent hole is provided on the insulating protective component.

[0027] In one alternative implementation, it further includes:

[0028] The electrode assembly is disposed within the housing, and the insulating protective element is sandwiched between the first cover plate and the electrode assembly; protruding electrode tabs are formed on the electrode assembly, and the electrode tabs protrude in a direction away from the insulating protective element.

[0029] In one alternative implementation, it further includes:

[0030] A second cover plate is connected to the housing, and the second cover plate and the first cover plate are disposed opposite to each other at both ends of the housing;

[0031] The pole is installed on the second cover plate.

[0032] Secondly, this application provides a battery pack including the battery cells described in any of the above technical solutions. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the specific embodiments of this application or 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 application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1. Exploded view of the structure of a battery cell in the prior art;

[0035] Figure 2 shows a battery cell with an area >100mm² provided in the embodiment of this application. 2 Exploded view of the pressure relief component;

[0036] Figure 3 shows a battery cell with an area >100mm² provided in the embodiment of this application. 2 A schematic diagram of the assembly structure of the pressure relief component, the first cover plate, and the partition component;

[0037] Figure 4 shows a battery cell with an area >100mm² installed in an embodiment of this application. 2 Exploded view of the structure of the first cover plate, insulating protection component and partition of the pressure relief component;

[0038] Figure 5 shows a battery cell with an area ≤100mm² provided in the embodiments of this application. 2 A schematic diagram of the assembly structure of the pressure relief component, the first cover plate, and the partition component;

[0039] Figure 6 shows a battery cell with an area ≤100mm² installed in an embodiment of this application. 2 Exploded view of the structure of the first cover plate, insulating protection component and partition of the pressure relief component;

[0040] Figure 7 shows a battery cell with an area ≤100mm² installed in an embodiment of this application. 2 A schematic diagram of the structure of the first cover plate of the pressure relief component.

[0041] Icons: 10-Housing; 20-First cover plate; 21-Support part; 30-Second cover plate; 31-Electrode post; 32-Plastic part; 40-Pressure relief part; 50-Separator part; 51-First vent; 52-Welding part; 60-Insulation protection part; 61-Second vent; 70-Electrode assembly; 71-Electrode tab; 72-Insulating film; 1-Cover plate; 2-Housing; 3-Electrode assembly; 4-Bare cell insulating film; 5-Lower plastic; 6-Explosion-proof valve. Detailed Implementation

[0042] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0043] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0044] According to a first aspect of this application, a battery cell is provided, which specifically includes a housing 10, a first cover plate 20, a pressure relief member 40, and a separator 50.

[0045] The specific structure of the battery cell according to this embodiment, as described above, will be described below.

[0046] In this embodiment, as shown in FIG2, a cavity for accommodating the electrode assembly 70 is formed inside the housing 10. A first cover plate 20 is installed on the housing 10. The first cover plate 20 is formed as a plate structure. Multiple protruding support portions 21 are formed on the side of the first cover plate 20 facing the inside of the battery cell. The support portions 21 are formed as protrusions. The support portions 21 can be formed by stamping on the side of the first cover plate 20 facing the outside of the battery cell, or they can be formed by other methods, such as bonding or welding the support portions 21 to the first cover plate 20. A pressure relief component 40 is installed on the first cover plate 20. The pressure relief component 40 can be an explosion-proof valve. When the pressure inside the battery cell reaches the opening pressure of the pressure relief component 40, the pressure relief component 40 opens, connecting the inside and outside of the battery cell, thereby realizing the venting and pressure relief.

[0047] In this embodiment, as shown in Figures 3 to 7, multiple support portions 21 are spaced around the pressure relief component 40, and the separator 50 is connected to the support portions 21, so that the separator 50 and the pressure relief component 40 are spaced apart. This allows the separator 50, the support portions 21, and the first cover plate 20 to form an exhaust channel connecting the inside of the battery cell and the pressure relief component 40. Even if the electrode assembly 70 is displaced inside the battery cell during thermal runaway, the separator 50 can prevent the electrode assembly 70 from blocking or sealing the pressure relief component 40, and prevent internal combustion materials from splashing outward during thermal runaway. The gas inside the battery cell can flow from the area enclosed by the support portions 21 and the separator 50 to the pressure relief component 40, thereby ensuring smooth exhaust and improving the safety performance of the battery cell.

[0048] In this embodiment, as shown in Figures 3 to 6, the separator 50 is formed as a long strip plate-like structure, such as a rectangular plate-like structure.

[0049] In this embodiment, the area of ​​the pressure relief component 40 is S0, the total contact area between the support portion 21 and the partition 50 is S1, and the area of ​​the outer edge of the partition 50 facing the support portion 21 is S2; as shown in Figures 5 to 7, when S0 ≤ 100 mm 2 At this time, the support part 21 is set at the four corners of the separator 50, and S1 / S2≥1 / 5; as shown in Figures 2 to 4, when S0>100mm 2 At this time, two support portions 21 are disposed at both ends of the partition 50 in the length direction and at both ends of the partition 50 in the width direction; the total contact area between the two support portions 21 disposed at both ends of the partition 50 in the width direction and the partition 50 is S11, for example, two support portions 21 are disposed at the middle position in the length direction of the partition 50, and the sum of the contact areas between these two support portions 21 and the partition 50 is S11; the total contact area between the two support portions 21 disposed at both ends of the partition 50 in the length direction and the partition 50 is S12, for example, in the width direction of the partition 50 Two support parts 21 are provided in the middle position of the upper part, and the sum of the contact areas between the two support parts 21 and the separator 50 is S12; S11+S12=S1; S11 / S12>1.3, S1 / S2>1 / 4. This ensures that the separator 50 has reliable and effective support for the electrode group 70 and the strength to resist the impact of airflow inside the cell. It avoids the situation where high temperature and high pressure gas drives the electrode group 70 to impact and deform the separator 50 or reduces the distance between the separator 50 and the first cover plate 20, resulting in insufficient exhaust area and failure to meet the pressure relief requirements, thereby improving the safety performance of the cell and battery pack.

[0050] The following applies to S0≤100mm 2 and S0 > 100mm 2 Each battery cell underwent a cell safety test to check if S0 ≤ 100mm². 2 When S1 / S2≥1 / 5 and S0>100mm 2 Can the constraints of S11 / S12 > 1.3 and S1 / S2 > 1 / 4 guarantee that the separator 50 blocks or seals the pressure relief component 40, thus meeting the venting requirements during thermal runaway of the battery cell? Furthermore, five groups of the same type of battery cell are used in each test group to ensure the reliability and accuracy of the test results. S0 = 80mm 2 ≤100mm 2 The test results are shown in Table 1 below, S0 = 110 mm 2 >100mm 2 The test results are shown in Table 2 below.

[0051] Table 1

[0052] As shown in Table 1, when the area S0 of the pressure relief component 40 is ≤ 100 mm² 2 In Examples 1-4 to 1-8, the ratio of S1 to S2 was greater than or equal to 1 / 5, all cell safety tests were passed, and no deformation of the separator 50 was found. The separator 50 had reliable and effective strength to support the electrode group 70, met the pressure relief requirements, and ensured the safety performance of the cell. However, in Examples 1-1 to 1-3, the ratio of S1 to S2 was less than 1 / 5, and deformation of the separator 50 was found after disassembly, which reduced the proportion of cell safety tests passed and could not guarantee the safety performance of the cell.

[0053] Table 2

[0054] As shown in Table 2, when the area S0 of the pressure relief component 40 is greater than 100 mm² 2 In Examples 2-4 to 2-7, the ratio of S1 to S2 is greater than 1 / 4, and S11 / S12 > 1.3. All cell safety tests passed, and no deformation of the separator 50 was found. The separator 50 reliably and effectively supports the electrode assembly 70, meeting the pressure relief requirements and ensuring the cell's safety performance. However, in Examples 2-1 to 2-3, the ratio of S1 to S2 is less than 1 / 4. After disassembly, deformation of the separator 50 was found, leading to a lower percentage of cell safety tests passed and failing to guarantee cell safety performance. In Example 2-8, although the condition S1 / S2 > 1 / 4 was met, S11 / S12 was less than 1.3, resulting in a low percentage of cell safety tests passed. Deformation of the separator 50 was found after disassembling the failed cell.

[0055] In this embodiment, as shown in Figures 3 and 5, the separator 50 is welded to the support portion 21 to form a welded portion 52.

[0056] Furthermore, preferably, the total area of ​​the welded portion 52 is S3, that is, the sum of the welded areas of all the support portions 21 and the partition 50 is S3, S3 / S1>1 / 2, to ensure that the connection between the support portion 21 and the partition 50 is firm; and / or, the weld penetration depth between the partition 50 and the support portion 21 is greater than 0.3mm, thereby further ensuring the weld strength between the support portion 21 and the partition 50.

[0057] In this embodiment, as shown in Figures 3 and 5, the separator 50 is connected to the surface of the support 21 away from the first cover plate 20, thereby increasing the connection area between the separator 50 and the support 21 and improving the assembly firmness of the separator 50 and the support 21. Preferably, the separator 50 is arranged parallel to the first cover plate 20, so that the separator 50 can effectively block the electrode group 70 to ensure smooth exhaust while avoiding excessive occupation of the internal space of the cell and affecting the energy density of the cell.

[0058] In this embodiment, as shown in Figures 4 and 6, the height dimension of the support portion 21 in the thickness direction of the first cover plate 20 is H, where 1mm≤H≤2.5mm. This ensures that the partition 50, the support portion 21, and the first cover plate 20 form an exhaust channel that connects the inside of the battery cell and the pressure relief component 40, providing sufficient exhaust area to avoid affecting the exhaust rate and also to prevent the dimension of H from being too large, which would affect the energy density of the battery cell.

[0059] As shown in Figures 3 to 6, the partition 50 is provided with a first air guide hole 51, which is a through hole penetrating the partition 50. In the thickness direction of the first cover plate 20, the first air guide hole 51 and the pressure relief member 40 are arranged opposite to each other, so that at least a portion of the gas can pass through the first air guide hole to the pressure relief member 40 during exhaust, thereby increasing the exhaust rate. Preferably, multiple first air guide holes 51 are provided, and the multiple first air guide holes 51 are arranged in an array on the partition 50, thus ensuring both the ventilation area and the structural strength of the partition 50.

[0060] In this embodiment, as shown in Figures 2 to 6, the battery cell further includes an insulating protective element 60. The insulating protective element 60 is disposed on the side of the separator 50 facing the inside of the battery cell. The insulating protective element 60 is sandwiched between the first cover plate 20 and the electrode group 70, and is used to separate the separator 50 and the first cover plate 20 from the electrode group 70 to form an insulating protection. The insulating protective element 60 is provided with a second vent hole 61, which is a through hole penetrating the insulating protective element 60. Preferably, multiple second vent holes 61 are arranged in an array on the insulating protective element 60. At low temperatures, the insulating protective element 60 has sufficient strength while meeting the venting requirements, ensuring smooth venting and that the venting rate is not affected.

[0061] In this embodiment, as shown in FIG2, the battery cell further includes a second cover plate 30, a terminal post 31, and a plastic component 32. The second cover plate 30 is connected to the housing 10, such that the first cover plate 20 and the second cover plate 30 together seal the housing 10. The terminal post 31 is installed on the second cover plate 30, such that the terminal post 31 and the pressure relief component 40 are located on different cover plates. Preferably, the second cover plate 30 and the first cover plate 20 are arranged opposite each other at both ends of the housing 10, thereby avoiding the accumulation and eruption of high-temperature and high-pressure gas at the location where the pressure relief component 40 is located, reducing the temperature influence on the terminal post 31, and reducing the risk of arcing and fire of the terminal post 31. The plastic component 32 is located on the side of the second cover plate 30 facing the inside of the battery cell, and is used to separate the second cover plate 30 and the conductive components in the battery cell, thereby forming insulation protection and reducing the risk of short circuit.

[0062] Preferably, the first cover plate 20 and the second cover plate 30 are disposed at both ends in the length direction of the battery cell, so as to separate the pressure relief component 40 and the terminal post 31 to the greatest extent and effectively reduce the risk of arcing and fire in the terminal post 31.

[0063] In this embodiment, as shown in FIG2, the outer side of the electrode assembly 70 is surrounded by an insulating film 72. The end of the insulating film 72 is thermally fused to the plastic part 32 and / or the insulating protective part 60. The electrode assembly 70 has protruding tabs 71, including positive tabs and negative tabs. The electrode post 31 includes a positive electrode post and a negative electrode post. The positive tabs are connected to the positive electrode post, and the negative tabs are connected to the negative electrode post. Preferably, the tabs 71 protrude in a direction away from the insulating protective part 60, so that the first cover plate 20 on which the pressure relief part 40 is installed and the second cover plate 30 on which the electrode post 31 is installed are located on opposite sides of the housing 10, reducing the risk of arcing and fire of the electrode post 31 during exhaust.

[0064] According to the battery cell provided in this application, a first cover plate is installed on the housing, and multiple protruding support portions are formed on the side of the first cover plate facing the inside of the battery cell; a pressure relief component is installed on the first cover plate, and multiple support portions are spaced around the pressure relief component. A separator is connected to the support portions, so that the separator and the pressure relief component are spaced apart. In the event of thermal runaway of the battery cell, even if the electrode assembly is displaced inside the battery cell, the separator can prevent the electrode assembly from blocking or sealing the pressure relief component, and prevent internal combustibles from being sprayed outward during thermal runaway. Gas inside the battery cell can flow from the area enclosed by the support portions and the separator to the pressure relief component, thereby ensuring smooth venting and improving the safety performance of the battery cell. The area of ​​the pressure relief component is S0; the total contact area between the support portions and the separator is S1, and the area of ​​the outer edge of the separator facing the support portion is S2; when S0≤100mm 2 When the support is located at the four corners of the separator, S1 / S2 ≥ 1 / 5; when S0 > 100mm 2At this time, two support parts are set at both ends of the separator in the length direction and two support parts are set at both ends of the separator in the width direction; the total contact area between the two support parts set at both ends of the separator in the width direction and the separator is S11, and the total contact area between the two support parts set at both ends of the separator in the length direction and the separator is S12, S11+S12=S1; S11 / S12>1.3, S1 / S2>1 / 4. This ensures that the separator has reliable and effective strength to support the electrode group and resist the impact of airflow inside the cell, avoiding the situation where high temperature and high pressure gas drives the electrode group to impact and deform the separator or reduces the distance between the separator and the first cover plate, resulting in insufficient exhaust area and failure to meet timely pressure relief, thereby improving the safety performance of the cell.

[0065] According to the present application, a battery pack includes the cells as described above. By setting a separator, the pressure relief component is prevented from being blocked or blocked by the electrode group during thermal runaway. The separator has sufficient strength to ensure that the venting space meets the pressure relief requirements, allowing for smooth venting and improving the safety performance of the battery pack. Industrial applicability

[0066] In the battery cell of this application, a first cover plate is installed on the housing, and multiple protruding support portions are formed on the side of the first cover plate facing the inside of the battery cell. A pressure relief component is installed on the first cover plate, and multiple support portions are spaced around the pressure relief component. A separator is connected to the support portions, so that the separator and the pressure relief component are spaced apart. Even if the electrode assembly is displaced inside the battery cell during thermal runaway, the separator can prevent the electrode assembly from blocking or sealing the pressure relief component and prevent internal combustion materials from splashing outward during thermal runaway. The gas inside the battery cell can flow from the area enclosed by the support portions and the separator to the pressure relief component, thereby ensuring smooth venting and improving the safety performance of the battery cell.

Claims

1. A battery cell, characterized in that, The battery cell includes: case; A first cover plate is installed on the housing, and a plurality of protruding support portions are formed on the side of the first cover plate facing the inside of the cell; A pressure relief component is installed on the first cover plate, and a plurality of the support portions are spaced apart around the pressure relief component, wherein the area of ​​the pressure relief component is S0; A separator is connected to the support portion, such that the separator and the pressure relief component are spaced apart, and the separator is formed into a long strip plate-like structure; The total contact area between the support and the partition is S1, and the area of ​​the outer edge of the partition facing the support is S2. When S0≤100 mm 2 The support portions are arranged at the four corners of the partition, and S1 / S2≥1 / 5. When S0 > 100mm 2 At the same time, the two support parts are disposed at both ends of the partition in the length direction and at both ends of the partition in the width direction; the total contact area between the two support parts disposed at both ends of the partition in the width direction and the partition is S11, and the total contact area between the two support parts disposed at both ends of the partition in the length direction and the partition is S12, S11+S12=S1; S11 / S12>1.3, S1 / S2>1 / 4.

2. The battery cell according to claim 1, characterized in that, The separator is welded to the support to form a welded section.

3. The battery cell according to claim 2, characterized in that, The total area of ​​the welded part is S3, and S3 / S1 > 1 / 2; And / or, the weld penetration depth between the separator and the support is greater than 0.3 mm.

4. The battery cell according to claim 1, characterized in that, The separator is connected to the surface of the support portion away from the first cover plate; The separator is arranged parallel to the first cover plate.

5. The battery cell according to claim 1, characterized in that, In the thickness direction of the first cover plate, the height dimension of the support portion is H, where 1mm≤H≤2.5mm.

6. The battery cell according to claim 1, characterized in that, The separator is provided with a first air vent; in the thickness direction of the first cover plate, the first air vent and the pressure relief component are arranged opposite to each other.

7. The battery cell according to claim 1, characterized in that, Also includes: An insulating protective component is disposed on the side of the separator facing the inside of the battery cell, and a second vent hole is provided on the insulating protective component.

8. The battery cell according to claim 7, characterized in that, Also includes: The electrode assembly is disposed within the housing, and the insulating protective element is sandwiched between the first cover plate and the electrode assembly; protruding electrode tabs are formed on the electrode assembly, and the electrode tabs protrude in a direction away from the insulating protective element.

9. The battery cell according to claim 1, characterized in that, Also includes: A second cover plate is connected to the housing, and the second cover plate and the first cover plate are disposed opposite to each other at both ends of the housing; The pole is installed on the second cover plate.

10. A battery pack, characterized in that, Includes the battery cell described in any one of claims 1 to 9.

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