Battery and battery pack

Abstract

The present application discloses a battery and a battery pack. The battery comprises a case, a top cover, a first pole, a second pole, and a first explosion-proof valve. The top cover is connected to the case along a first direction, and the top cover is provided with an electrolyte injection hole passing through in the first direction; the first pole and the second pole pass through the top cover, the second pole is spaced apart from the first pole in a second direction, and in the second direction, the electrolyte injection hole is located between the first pole and the second pole; and the first explosion-proof valve is connected to the top cover, and is located on the side of the first pole distant from the second pole in the second direction. Since the electrolyte injection hole is located between the first pole and the second pole, the first explosion-proof valve is arranged on the side of the first pole distant from the second pole, and the first explosion-proof valve and the electrolyte injection hole are spaced apart by the first pole, the distance between the electrolyte injection hole and the explosion-proof valve is relatively far, and the risk of electrolyte intrusion into the explosion-proof valve during electrolyte injection of the battery is relatively low, thereby helping to ensure production quality of the battery.

Description

A battery and battery pack

[0001] Cross-references to related applications

[0002] This application claims the benefit of Chinese Patent Application No. 202520256799.4, filed on February 18, 2025, 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 and battery pack. Background Technology

[0004] In related technologies, the battery's electrolyte filling hole and explosion-proof valve are both located between the two terminals. In order to meet the pressure relief capacity, the size of the explosion-proof valve usually needs to be made larger. However, the space between the two terminals is limited. Therefore, the distance between the electrolyte filling hole and the explosion-proof valve is relatively close. When the battery is filled with electrolyte, there is a relatively high risk that the electrolyte will enter the explosion-proof valve.

[0005] Application content

[0006] The primary objective of this application is to provide a battery in which the risk of electrolyte intrusion into the explosion-proof valve is relatively small during electrolyte filling.

[0007] To achieve the above objectives, this application provides a battery having intersecting first and second directions, comprising:

[0008] case,

[0009] A top cover is connected to the housing along the first direction, and the top cover is provided with a liquid injection hole that extends through the first direction;

[0010] The first pole post is inserted through the top cover;

[0011] The second electrode post is inserted through the top cover, and the second electrode post is spaced apart from the first electrode post along the second direction. Along the second direction, the injection hole is located between the first electrode post and the second electrode post.

[0012] A first explosion-proof valve is connected to the top cover, and the first explosion-proof valve is located on the side of the first pole away from the second pole along the second direction.

[0013] In one particular embodiment of this application, the battery further includes a second explosion-proof valve, which is connected to the top cover and is located on the side of the second electrode post away from the first electrode post along the second direction.

[0014] In one specific embodiment of this application, the first explosion-proof valve and the second explosion-proof valve have the same structure.

[0015] In a specific embodiment of this application, the first explosion-proof valve includes a valve body and a first notch. The valve body is connected to the top cover. The housing has a bottom wall, which is disposed opposite to the top cover along the first direction. The first notch is located on the side of the valve body away from the bottom wall, and the first notch is recessed toward the bottom wall along the first direction.

[0016] In a specific embodiment of this application, the top cover is provided with a mounting hole that extends through the first direction, the projection of the circumferential wall of the mounting hole is polygonal, and the valve body covers the mounting hole.

[0017] In one particular embodiment of this application, the first notch is an enclosing structure with an opening.

[0018] In a specific embodiment of this application, the top cover is provided with a mounting hole that extends through the first direction. The mounting hole is circular or elliptical, and the valve body covers the mounting hole.

[0019] In a specific embodiment of this application, the housing includes a bottom wall and a side wall, the two ends of the side wall along the first direction being connected to the top cover and the bottom wall respectively; the battery further includes a third explosion-proof valve, the third explosion-proof valve being disposed on the bottom wall or the side wall.

[0020] In one particular embodiment of this application, the third explosion-proof valve is integrally formed with the housing.

[0021] In a specific embodiment of this application, the third explosion-proof valve has a thinning area, and a second groove is provided on the side of the thinning area away from the interior of the housing. The second groove is located in the thinning area and is recessed toward the interior of the housing. The depth of the second groove is not greater than the depth of the first groove along the first direction.

[0022] In a specific embodiment of this application, the second groove includes a first sub-grooves and a second sub-grooves, the first sub-grooves and the second sub-grooves being strip-shaped and intersecting each other.

[0023] In a specific embodiment of this application, the second notch includes a plurality of third sub-notches and at least one fourth sub-notch. Both the third sub-notches and the fourth sub-notches are strip-shaped. The plurality of third sub-notches are connected in sequence to form an enclosing structure with a notch. The fourth sub-notch is located at the notch and is spaced apart from the third sub-notches.

[0024] In a specific embodiment of this application, the third explosion-proof valve is disposed on the bottom wall, and the bottom wall is provided with an explosion-proof hole that penetrates along the first direction, and the explosion-proof hole is rectangular.

[0025] In one particular embodiment of this application, the battery further includes a protective film that covers the mounting hole.

[0026] This application also proposes a battery pack, including a housing and a battery as described above.

[0027] The present application discloses a battery and battery pack, which, compared with the prior art, have the following advantages:

[0028] In the battery of this application, the electrolyte injection hole is located between the first terminal and the second terminal, while the first explosion-proof valve is located on the side of the first terminal away from the second terminal. The first explosion-proof valve and the electrolyte injection hole are separated by the first terminal. As a result, the distance between the electrolyte injection hole and the explosion-proof valve is relatively far. When the battery is filled with electrolyte, the risk of electrolyte entering the explosion-proof valve is relatively small, which is conducive to ensuring the production quality of the battery. Attached Figure Description

[0029] Figure 1 is a perspective view of the battery according to an embodiment of this application;

[0030] Figure 2 is a structural diagram of the top cover and the first explosion-proof valve in an embodiment of this application;

[0031] Figure 3 is a structural diagram of the first explosion-proof valve shown in Figure 2;

[0032] Figure 4 is a structural diagram of the top cover and the first explosion-proof valve in another embodiment of this application;

[0033] Figure 5 is a structural diagram of the first explosion-proof valve shown in Figure 4;

[0034] Figure 6 is a structural diagram of the top cover and the first explosion-proof valve in another embodiment of this application;

[0035] Figure 7 is a structural diagram of the first explosion-proof valve shown in Figure 6;

[0036] Figure 8 is a structural diagram of the bottom wall and the third explosion-proof valve in an embodiment of this application;

[0037] Figure 9 is a structural diagram of the bottom wall and the third explosion-proof valve in another embodiment of this application;

[0038] Figure 10 is a structural diagram of the sidewall and the third explosion-proof valve in an embodiment of this application;

[0039] Figure 11 is a structural diagram of the bottom wall and the third explosion-proof valve in another embodiment of this application;

[0040] Figure 12 is a structural diagram of the bottom wall and the third explosion-proof valve in another embodiment of this application;

[0041] Figure 13 is a structural diagram of the bottom wall and the third explosion-proof valve in another embodiment of this application;

[0042] Figure 14 is a structural diagram of the bottom wall and the third explosion-proof valve in another embodiment of this application. In the figure, Z represents the first direction; X represents the second direction; 1 is the housing; 12 is the bottom wall; 13 is the side wall; 101 is the top cover; 1011 is the injection hole; 1012 is the mounting hole; 1013 is the explosion-proof hole; 2 is the first pole post; 3 is the second pole post; 4 is the first explosion-proof valve; 41 is the valve body; 42 is the first notch; 5 is the second explosion-proof valve; 6 is the third explosion-proof valve; 601 is the thinning area; 602 is the second notch; 6021 is the first sub-notch; 6022 is the second sub-notch; 6023 is the third sub-notch; 6024 is the fourth sub-notch; 7 is the protective diaphragm; 100 is the notch. Detailed Implementation

[0043] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0044] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the embodiments of the application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -1° to 1°. "Perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 89° to 91°. Equal distances, equal angles, or equal areas refer to a state in which the tolerance range is -1% to 1%.

[0048] This application proposes a battery pack, including a housing and a battery as described below. The battery pack can store a large amount of electrical energy through the battery and can provide power for electric vehicles, electric motorcycles, power tools and other equipment. Since the battery pack uses the battery described below, the battery pack also has the advantages of the battery described below, which will not be elaborated further in this application.

[0049] As shown in Figures 1 and 2, a battery according to a preferred embodiment of this application has a first direction Z and a second direction X perpendicular to each other. The battery includes a housing 1, a top cover 101, a first terminal 2, a second terminal 3, and a first explosion-proof valve 4. The top cover 101 is connected to the housing 1 along the first direction Z and has an injection hole 1011 that extends through the first direction Z. The first terminal 2 and the second terminal 3 are disposed through the top cover 101. The second terminal 3 is spaced apart from the first terminal 2 along the second direction X. The injection hole 1011 is located between the first terminal 2 and the second terminal 3 along the second direction X. The first explosion-proof valve 4 is connected to the top cover 101 and is located on the side of the first terminal 2 away from the second terminal 3 along the second direction X.

[0050] In the battery described above, the electrolyte injection hole 1011 is located between the first electrode post 2 and the second electrode post 3, while the first explosion-proof valve 4 is located on the side of the first electrode post 2 away from the second electrode post 3. The first explosion-proof valve 4 and the electrolyte injection hole 1011 are separated by the first electrode post 2. As a result, the distance between the electrolyte injection hole 1011 and the explosion-proof valve is relatively far. When the battery is being filled with electrolyte, the risk of electrolyte entering the explosion-proof valve is relatively small, which is beneficial to ensuring the production quality of the battery.

[0051] Furthermore, as shown in Figures 1 and 2, the battery also includes a second explosion-proof valve 5. The second explosion-proof valve 5 is connected to the top cover 101 and is located on the side of the second pole 3 away from the first pole 2 along the second direction X. That is, explosion-proof valves are provided at both ends of the top cover 101 along the second direction X. Based on this structure, when a large amount of gas is generated inside the battery due to various abnormal conditions (such as overcharging, short circuit, etc.), causing the pressure to rise, the first explosion-proof valve 4 and the second explosion-proof valve 5 can release the pressure from both ends of the battery top cover 101 along the second direction X at the same time, which can release the pressure more evenly and reduce the damage to the battery structure caused by excessive local stress. Moreover, since the pressure is released through the first explosion-proof valve 4 and the second explosion-proof valve 5, the pressure release positions are not in the same place, which can reduce the accumulation of splashes and reduce the risk of fire.

[0052] In this embodiment, the top cover 101 is provided with a mounting hole 1012 that runs through the first direction Z. The first explosion-proof valve 4 covers the mounting hole 1012. The first explosion-proof valve 4 and the top cover 101 are independent components with relatively simple structures. They can be processed separately and have relatively low production difficulty.

[0053] Furthermore, the first explosion-proof valve 4 includes a valve body 41 and a first notch 42. The valve body 41 is connected to the top cover 101 and seals the mounting hole 1012. The housing 1 has a bottom wall 12, which is disposed opposite to the top cover 101 along the first direction Z. The first notch 42 is disposed on the side of the valve body 41 away from the bottom wall 12, and the first notch 42 is recessed toward the bottom wall 12 along the first direction Z.

[0054] The valve body 41 is plate-shaped. Based on the first notch 42, the valve body 41 is relatively thin at the first notch 42, making it relatively fragile. When a large amount of gas is generated inside the battery due to various abnormal conditions (such as overcharging, short circuit, etc.), causing the pressure to rise, the pressure will first break through at the first notch 42, causing the valve body 41 to crack along the first notch 42, forming an exhaust channel to release the high-pressure gas inside the battery in time, preventing the battery from exploding due to excessive internal pressure, thereby ensuring the safety of the battery and the surrounding environment. As one implementation of this application, as shown in Figures 2 and 3, the projection of the circumferential wall of the mounting hole 1012 is elliptical. At this time, the outer edge of the valve body 41 is elliptical, the valve body 41 is located inside the mounting hole 1012, and the first notch 42 is arc-shaped.

[0055] In other embodiments, as shown in Figures 4 and 5, the projection of the circumferential wall of the mounting hole 1012 is circular. In this case, the outer edge of the valve body 41 is circular, the valve body 41 is located in the mounting hole 1012, and the first groove 42 is arc-shaped. The first explosion-proof valve 4 with this structure has a more uniform stress distribution, better resistance to deformation, and more stable burst value.

[0056] In other embodiments, the projection of the circumferential wall of the mounting hole 1012 is polygonal. For example, as shown in Figures 6 and 7, the projection of the circumferential wall of the mounting hole 1012 is rectangular. In this case, the outer edge of the valve body 41 is rectangular. The valve body 41 is located inside the mounting hole 1012. The first groove 42 is formed by connecting multiple straight lines in sequence to form an enclosing structure with an opening. The advantage of this type of explosion-proof valve 4 is that it has a larger pressure relief area under the same length and width.

[0057] In this embodiment, as shown in Figures 1 and 2, the first explosion-proof valve 4 and the second explosion-proof valve 5 have the same structure. The second pole post 3 also has a mounting hole 1012 on the side away from the first pole post 2 along the second direction X. The second explosion-proof valve 5 covers the mounting hole 1012 on the side of the second pole post 3. Of course, in other embodiments, the structures of the first explosion-proof valve 4 and the second explosion-proof valve 5 may be different, and this application does not limit this.

[0058] In this embodiment, the battery also includes a third explosion-proof valve 6, which is disposed on the housing 1. The third explosion-proof valve 6 has a thinning region 601 and is integrally formed with the housing 1. A second notch 602 is provided on the side of the thinning region 601 away from the inside of the housing 1. The second notch 602 is disposed in the thinning region 601 and is recessed towards the inside of the housing 1. Similarly, the second notch 602 makes the structure at the corresponding position in the thinning region 601 weak. When the gas inside the battery increases, causing the pressure to rise, the pressure will first break through at the second notch 602, causing the thinning region 601 to crack along the second notch 602, forming an exhaust channel to release the high-pressure gas inside the battery in time.

[0059] The depth of the second notch 602 along the first direction Z is no greater than the depth of the first notch 42 along the first direction Z. In this embodiment, the depth of the second notch 602 along the first direction Z is the same as the depth of the first notch 42 along the first direction Z. Because the battery is equipped with a first explosion-proof valve 4, a second explosion-proof valve 5, and a third explosion-proof valve 6, the battery has a larger pressure relief area. The simultaneous operation of the first explosion-proof valve 4, the second explosion-proof valve 5, and the third explosion-proof valve 6 allows for faster gas discharge, timely reduction of internal battery pressure, and effective prevention of dangerous situations such as explosions caused by excessive pressure.

[0060] In addition, the third explosion-proof valve 6 is integrally formed with the housing 1. Its advantage is that it reduces the connection links between the third explosion-proof valve 6 and the housing 1, eliminating the need for additional sealing measures to ensure the sealing between the two, avoiding the problem of aging of sealing materials, making the overall battery structure more compact, with better sealing, and better able to resist external forces when facing external impacts and vibrations.

[0061] In other embodiments, the depth of the second notch 602 (referring to the depth of the second notch 602 recessed towards the interior of the housing 1, as shown in Figure 13 perpendicular to the plane shown) can be less than the depth of the first notch 42 (referring to Figure 1 along the first direction Z towards the interior of the housing). This facilitates the first explosion-proof valve 4 to preferentially discharge gas, which is then discharged through the third explosion-proof valve 6. Preferential gas discharge from the top will not affect adjacent batteries. In this embodiment, the depth of the notch on the second explosion-proof valve 5 can be the same as the depth of the first notch 42.

[0062] In this application, the housing 1 includes a bottom wall 12 and a side wall 13. The two ends of the side wall 13 along the first direction Z are respectively connected to the top cover 101 and the bottom wall 12. The third explosion-proof valve 6 is disposed on the bottom wall 12 or the side wall 13. For example, as shown in FIG8, the third explosion-proof valve 6 is disposed on the bottom wall 12, or, as shown in FIG10, the third explosion-proof valve 6 is disposed on the side wall 13. This application does not limit this, and the placement of the third explosion-proof valve 6 is determined according to the actual application.

[0063] In this application, the third explosion-proof valve 6 is provided on the bottom wall 12, and the bottom wall 12 is provided with an explosion-proof hole 1013 that extends through the first direction Z. The circumferential hole wall of the explosion-proof hole 1013 is projected into the plane where the bottom wall 12 is located along the first direction Z as a rectangle.

[0064] Because the shape of the third explosion-proof valve 6 matches the shape of the explosion-proof hole 1013, the edge of the thinning area 601 is rectangular. Of course, the explosion-proof hole 1013 can also be other polygonal, circular, or elliptical shapes, as shown in Figures 8 and 10. In the case of an elliptical edge in the thinning area 601, the second notch 602 is arc-shaped. In Figure 9, the edge of the thinning area 601 is circular, and the second notch 602 is arc-shaped. In Figure 11, the edge of the thinning area 601 is circular, and the second notch 602 is strip-shaped and multiple in number, intersecting at a single point. The second notches 602 are straight lines, making processing easier and improving manufacturability. The quality is more stable, and the multiple second notches 602 form a symmetrical structure, resulting in better consistency of the burst value of the third explosion-proof valve 6. Furthermore, it has better resistance to deformation in the event of gas generation inside the battery. As shown in Figure 12, the edge of the thinning area 601 is rectangular. In this case, the second notches 602 are strip-shaped and there are two of them. The two second notches 602 intersect each other. The straight-line shape of the second notches 602 makes processing easier, improves manufacturability, and results in more stable quality. The two second notches 602 form a symmetrical structure, resulting in better consistency of the burst value of the third explosion-proof valve 6. Furthermore, it has better resistance to deformation in the event of gas generation inside the battery. All of the above-described third explosion-proof valves 6 can achieve pressure relief functions.

[0065] In addition, for the structure of the second notch 602, taking the edge of the thinning area 601 as a rectangle as an example, in some embodiments, as shown in FIG. 13, the second notch 602 includes a first sub-notch 6021 and a second sub-notch 6022. The first sub-notch 6021 and the second sub-notch 6022 are strip-shaped, and the first sub-notch 6021 and the second sub-notch 6022 intersect.

[0066] Both the first sub-notch 6021 and the second sub-notch 6022 are in a straight line shape, with lower processing difficulty, better manufacturability, and more stable quality. The first sub-notch 6021 and the second sub-notch 6022 form a symmetric structure, such as the first sub-notch 6021 and the second sub-notch 6022 intersecting in a king shape, a rice shape, or an X shape. Compared with the non-intersecting shape in FIG. 8, the bursting values of the third explosion-proof valve 6 where the first sub-notch 6021 and the second sub-notch 6022 intersect are more consistent, and it has better anti-deformation ability for the gas generation situation inside the battery. In addition, the second notch 602 with this structure is also applicable to the thinning areas 601 of the above other shapes, and the present application will not elaborate on this too much.

[0067] Specifically, the number of the first sub-notches 6021 is three, and the three first sub-notches 6021 are arranged in parallel at intervals. The number of the second sub-notch 6022 is one, and the second sub-notch 6022 extends along the arrangement direction of the three first sub-notches 6021 and is connected to the three first sub-notches 6021. The second sub-notch 6022 is perpendicular to the first sub-notch 6021. For the second notch 602 with this structure, both the first sub-notch 6021 and the second sub-notch 6022 are in a straight line shape, with lower processing difficulty, better manufacturability, and more stable quality. The first sub-notch 6021 and the second sub-notch 6022 form a symmetric structure, the bursting values of the third explosion-proof valve 6 are more consistent, and it has better anti-deformation ability for the gas generation situation inside the battery. In addition, the second notch 602 with this structure is also applicable to the thinning areas 601 of the above other shapes, and the present application will not elaborate on this too much.

[0068] In some embodiments, as shown in FIG. 14, the second notch 602 includes a plurality of third sub-notches 6023 and at least one fourth sub-notch 6024. The third sub-notches 6023 and the fourth sub-notches 6024 are both strip-shaped. The plurality of third sub-notches 6023 are connected in sequence to form an enclosing structure with a notch 100, and the fourth sub-notch 6024 is arranged at the notch 100 and is spaced from the third sub-notch 6023.

[0069] Similarly, for the second notch 602 with this structure, compared with the second notch 602 in FIG. 8, due to the arrangement of the third sub-notches 6023 forming an enclosing structure combined with the fourth sub-notch 6024 arranged at the notch 100, this structure has the advantage of good bursting performance.

[0070] In this application, as shown in Figures 1 and 2, the battery also includes a protective film 7. The protective film 7 is connected to the side of the top cover 101 facing away from the bottom wall 12 and covers the mounting hole 1012. The function of the protective film 7 is to protect the first explosion-proof valve 4 and the second explosion-proof valve 5, and to prevent foreign objects from entering the mounting hole 1012.

[0071] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A battery having intersecting first direction (Z) and second direction (X), wherein, The battery includes: Shell (1), The top cover (101) is connected to the housing (1) along the first direction (Z), and the top cover (101) is provided with a liquid injection hole (1011) that extends through along the first direction (Z); The first pole post (2) is inserted through the top cover (101); The second pole post (3) is inserted through the top cover (101), and the second pole post (3) is spaced apart from the first pole post (2) along the second direction (X). Along the second direction (X), the injection hole (1011) is located between the first pole post (2) and the second pole post (3). The first explosion-proof valve (4) is connected to the top cover (101), and the first explosion-proof valve (4) is located on the side of the first pole post (2) away from the second pole post (3) along the second direction (X).

2. The battery according to claim 1, wherein, The battery also includes a second explosion-proof valve (5), which is connected to the top cover (101) and is located on the side of the second pole (3) away from the first pole (2) along the second direction (X).

3. The battery according to claim 2, wherein, The first explosion-proof valve (4) has the same structure as the second explosion-proof valve (5).

4. The battery according to claim 1, wherein, The first explosion-proof valve (4) includes a valve body (41) and a first notch (42). The valve body (41) is connected to the top cover (101). The housing (1) has a bottom wall (12). The bottom wall (12) is disposed opposite to the top cover (101) along the first direction (Z). The first notch (42) is disposed on the side of the valve body (41) away from the bottom wall (12), and the first notch (42) is recessed toward the bottom wall (12) along the first direction (Z).

5. The battery according to claim 4, wherein, The top cover (101) is provided with a mounting hole (1012) that runs through the first direction (Z). The projection of the circumferential hole wall of the mounting hole (1012) is polygonal. The valve body (41) covers the mounting hole (1012).

6. The battery according to claim 4, wherein, The first notch (42) is an enclosed structure with an opening.

7. The battery according to claim 4, wherein, The top cover (101) is provided with a mounting hole (1012) that runs through the first direction (Z). The mounting hole (1012) is circular or elliptical. The valve body (41) covers the mounting hole (1012).

8. The battery according to claim 4, wherein, The housing (1) includes a bottom wall (12) and a side wall (13), the two ends of the side wall (13) along the first direction (Z) are respectively connected to the top cover (101) and the bottom wall (12); the battery also includes a third explosion-proof valve (6), the third explosion-proof valve (6) is disposed on the bottom wall (12) or the side wall (13).

9. The battery according to claim 8, wherein, The third explosion-proof valve (6) is integrally formed with the housing (1).

10. The battery according to claim 8, wherein, The third explosion-proof valve (6) has a thinning area (601). A second groove (602) is provided on the side of the thinning area (601) away from the inside of the housing (1). The second groove (602) is located in the thinning area (601) and is recessed toward the inside of the housing (1). The depth of the second groove (602) is not greater than the depth of the first groove (42) along the first direction (Z).

11. The battery according to claim 10, wherein, The second etch mark (602) includes a first sub-etch mark (6021) and a second sub-etch mark (6022), the first sub-etch mark (6021) and the second sub-etch mark (6022) are strip-shaped, and the first sub-etch mark (6021) and the second sub-etch mark (6022) intersect.

12. The battery according to claim 10, wherein, The second etch mark (602) includes a plurality of third sub-etch marks (6023) and at least one fourth sub-etch mark (6024). The third sub-etch marks (6023) and the fourth sub-etch marks (6024) are both strip-shaped. The plurality of third sub-etch marks (6023) are connected in sequence to form an enclosing structure with a notch (100). The fourth sub-etch mark (6024) is located at the notch (100) and is spaced apart from the third sub-etch marks (6023).

13. The battery according to claim 8, wherein, The third explosion-proof valve (6) is located on the bottom wall (12), and the bottom wall (12) is provided with an explosion-proof hole (1013) that runs through the first direction (Z). The explosion-proof hole (1013) is rectangular.

14. The battery according to claim 5, wherein, The battery also includes a protective film (7) that covers the mounting hole (1012).

15. A battery pack, wherein, It includes a housing and a battery as described in any one of claims 1-14.

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