A battery cover plate and a battery containing the same

Abstract

The utility model provides a battery cover plate and contain its battery, relate to battery technical field, the cover plate includes cover plate main part, be equipped with reinforcing area on the cover plate main part, reinforcing area includes at least one convex in the cover plate main part inner end face convex piece, the convex piece extends along the thickness direction of cover plate main part, at least one the convex piece is close to the inner shell wall of battery shell, the cover plate main part is installed with pole column, the inner end face of pole column is installed with the extension piece, the extension piece protrudes and extends along the thickness direction of cover plate main part, and the extension piece is close to the inner shell wall of the shell, can effectively promote the connection stability of cover plate main body and shell, avoids the connection failure when being subjected to external collision impact, simple structure is favorable to the use safety of battery promotion.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cover and a battery containing the same. Background Technology

[0002] The battery cover is a component that is sealed to the opening of the battery casing. Its function is to seal and protect the casing, so as to isolate the inside of the battery casing from the outside. The battery cover is usually connected to the battery casing by welding. With the development of new energy vehicles, batteries are also gradually being used in new energy vehicles.

[0003] When a vehicle is involved in a collision, if the battery is subjected to a large impact force, there will be a large displacement of the battery, which may cause the connection between the battery cover and the casing to fail, affecting the safety of the battery.

[0004] When the cover plate is welded to its shell, or during its charging and discharging process, or when it is impacted or squeezed during a vehicle collision, there may be areas on the cover plate that undergo irreversible changes due to abnormal local temperature changes. This area is usually called the heat-affected zone. If the cover plate fails in the heat-affected zone, it will also affect the safety of the battery. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a battery cover and a battery containing the same, which can effectively improve the connection stability between the cover body and the shell, avoid connection failure when subjected to external collisions and impacts, and help improve the safety of battery use.

[0006] This utility model provides a battery cover plate, including a cover plate body, a reinforcing area on the cover plate body, the reinforcing area including at least one protrusion on the inner end face of the cover plate body, the protrusion extending along the thickness direction of the cover plate body, at least one of the protrusions being close to the inner shell wall of the battery housing, an electrode post being installed on the cover plate body, an extension protruding from the inner end face of the electrode post, the extension protruding and extending along the thickness direction of the cover plate body, and the extension being close to the inner shell wall of the housing.

[0007] In one embodiment, the cover plate body is provided with a deformation area, the deformation area including at least one groove formed on the inner end face of the cover plate body.

[0008] In one embodiment, the groove includes a first functional groove that extends through the cover body at least at one end in the width direction of the cover body.

[0009] In one embodiment, the first functional groove is located near the inner shell wall of the housing on one side of the cover plate body along its length, and the first functional groove penetrates the cover plate body on the side near the inner shell wall.

[0010] In one embodiment, the groove includes a second functional groove and a third functional groove, the second functional groove being formed on the inner end face of the cover plate body, and the third functional groove being formed at the bottom of the second functional groove.

[0011] In one embodiment, the center of the bottom of the second functional slot coincides with the center of the bottom of the third functional slot.

[0012] In one embodiment, the groove includes a fourth functional groove, which is formed on the side near the protrusion, and one side wall of the fourth functional groove is flush with the end face of the protrusion on the side near the fourth functional groove.

[0013] This utility model also proposes a battery, including a housing and the aforementioned battery cover plate, wherein the main body of the cover plate is connected to one end of the housing.

[0014] This utility model also proposes a battery, including a housing and a positive electrode cover plate and a negative electrode cover plate connected to both ends of the housing, wherein at least one of the positive electrode cover plate and the negative electrode cover plate is the aforementioned battery cover plate.

[0015] In one embodiment, the housing includes a first shell member and a second shell member, wherein the end face area of ​​the first shell member is greater than the end face area of ​​the second shell member, and the thickness of the first shell member is less than or equal to the thickness of the second shell member.

[0016] The beneficial effects of this utility model are as follows: The reinforcement zone is designed by providing at least one protrusion on the inner end face of the cover plate body. The protrusion can support and reinforce the cover plate body, increasing the thickness of the cover plate body in the reinforcement zone. By placing the protrusion near the inner shell wall of the shell, the stability of the cover plate body at the connection with the shell can be increased. When the cover plate body is subjected to external impact, the reinforcement zone can withstand a larger impact force without easily deforming or breaking, which helps to ensure the structural stability of the cover plate body. This makes the cover plate less prone to deformation at the connection with the shell, ensuring good stability of the connection between the cover plate and the shell. In particular, when a heat-affected zone is generated in the cover plate body, the protrusion can play a stabilizing role, preventing the cover plate body from failing in the heat-affected zone. The extension can increase the structural strength of the pole. By configuring the extension close to the inner shell wall of the housing, when the cover plate body is subjected to external impact at the pole, the extension can prevent the pole from undergoing large deformation and failure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the cover plate body according to an embodiment of the present utility model.

[0019] Figure 2 This is a schematic diagram of the cover plate body and pole of an embodiment of the present utility model.

[0020] Figure 3 This is a cross-sectional view of the cover plate body and the pole post according to an embodiment of the present utility model.

[0021] Figure 4 This is a schematic diagram of the structure of the cover plate body according to another embodiment of the present utility model.

[0022] Figure 5 This is a schematic diagram of the cover plate body according to another embodiment of the present utility model.

[0023] Figure 6 This is a schematic diagram of the cover plate body of another embodiment of the present utility model.

[0024] Figure 7 This is a schematic diagram of the structure of a battery according to an embodiment of the present invention.

[0025] In the picture: 10-Cover plate body; 101-Explosion-proof valve; 102-Connecting edge; 103-Pole post; 104-Extension; 11-First functional slot; 12-Second functional slot; 13-Third functional slot; 14-Protrusion; 15-Fourth functional slot; 151-Transition chamfer; 20-Housing shell; 21-First housing piece; 22-Second housing piece. Detailed Implementation

[0026] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the description of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] Unless otherwise explicitly specified and limited, the terms "setup," "installation," and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms based on the specific circumstances.

[0028] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of description and simplification, 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. Therefore, they should not be construed as limitations on this utility model.

[0029] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0030] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0031] In one embodiment, combined with Figure 1 and Figure 7 The battery cover proposed in this utility model includes a cover body 10. For ease of understanding, when the cover body 10 is connected to the battery housing 20, the end closer to the housing 20 is defined as the inner end, and the end away from the housing 20 is defined as the outer end. The cover body 10 is provided with a reinforcing area, which includes at least one protrusion 14 protruding from the inner end face of the cover body 10. The protrusion 14 extends along the thickness direction of the cover body 10, and at least one protrusion 14 is close to the inner shell wall of the housing 20, so that the cover body 10 is less prone to deformation at the reinforcing area when subjected to external impact. Figure 2 and Figure 3 A pole post 103 is installed on the cover plate body 10. An extension 104 is protruding on the inner end face of the pole post 103. The extension 104 protrudes and extends along the thickness direction of the cover plate body 10, and the extension 104 is close to the inner shell wall of the housing 20.

[0032] The reinforcement zone is provided by providing at least one protrusion 14 on the inner end face of the cover plate body 10. The protrusion 14 can support and reinforce the cover plate body 10, increasing the thickness of the cover plate body 10 in the reinforcement zone. By placing the protrusion 14 near the inner shell wall of the shell 20, the stability of the cover plate body 10 at the connection with the shell 20 can be increased. When the cover plate body 10 is subjected to external impact, the reinforcement zone can withstand a large impact force without easily deforming or breaking, which helps to ensure the structural stability of the cover plate body 10. This also makes the cover plate less prone to deformation at the connection with the shell 20, ensuring good stability of the connection between the cover plate and the shell 20. In particular, when a heat-affected zone is generated at the cover plate body 10, the protrusion 14 can play a stabilizing role, preventing the cover plate body 10 from failing in the heat-affected zone. The extension 104 can increase the structural strength of the pole post 103. When the extension 104 is configured close to the inner shell wall of the housing 20, the extension 104 can prevent the pole post 103 from undergoing large deformation and failure when the cover plate body 10 is affected by external impact at the pole post 103.

[0033] It should be noted that the aforementioned "external impact" can be the impact and displacement intrusion caused by the collision energy due to a vehicle collision, or it can be an impact that makes the structure unstable due to thermal effects.

[0034] In practical use, individual batteries are usually connected in series and / or parallel to form a battery pack to obtain a larger capacity. For ease of description, individual batteries and battery packs are collectively referred to as batteries in this application. Those skilled in the art can flexibly understand the meaning of batteries according to actual needs. For example, to ensure the range of new energy vehicles, battery packs are usually installed in the vehicle.

[0035] For example, the cover body 10 can be a light aluminum sheet of a positive electrode cover.

[0036] For example, when processing the cover plate body 10, the cover plate body 10 is cut by means of stamping or machining to form a protrusion 14 integral with the cover plate body 10. Furthermore, the protrusion 14 is perpendicular to the cover plate body 10.

[0037] For example, the protrusion 14 has a length dimension ≥ 1 mm along the length direction of the cover plate body 10, the width dimension of the protrusion 14 is the same as the width dimension of the cover plate body 10, and the thickness dimension of the protrusion 14 is ≥ 1.1 mm. This configuration ensures that the protrusion 14 has a certain structural support function, preventing the connection between the cover plate body 10 and the housing 20 from breaking.

[0038] Understandably, the protrusion 14 is located on the side of the cover body 10 that is susceptible to external impact. For example, when the battery is installed on a vehicle, if the battery is susceptible to external impact on the side of the cover body 10 along its length, the protrusion 14 is located on the side of the cover body 10 along its length and close to the inner wall of the housing 20. This ensures that when the housing 20 is deformed by impact, the protrusion 14 will support the housing 20, thereby preventing the housing 20 from undergoing large deformation and causing it to break at the connection with the cover.

[0039] For example, the extension 104 is located at one end of the pole post 103 along the length of the cover body 10.

[0040] For example, the extension 104 is perpendicular to the inner end face of the pole post 103, and the two are integrally formed.

[0041] For example, the pole 103 can be a positive pole or a negative pole depending on the installation position of the cover plate body 10.

[0042] For example, refer to Figure 2 and Figure 3 The pole post 103 has a length along the cover plate body 10 of ≥5mm, and its thickness protruding from the inner end face of the cover plate body 10 is ≥1mm. The sum of the thickness of the pole post 103 protruding from the inner end face of the cover plate body 10 and the thickness of the extension member 104 in the cover plate body 10 is ≥1mm. With this configuration, the extension member 104 can act as a buffer when subjected to impact, ensuring the structural stability of the pole post 103.

[0043] For example, the extension 104 has a length dimension of ≥1mm in the cover body 10. This configuration avoids the problem that the extension 104 is too thin and therefore has insufficient strength, and prevents the extension 104 from being bent under impact, thus giving the extension 104 a good cushioning effect.

[0044] For example, such as Figure 3 As shown, the distance d6 between the end face of the extension member 104 and the edge of the cover plate body 10 in the length direction is greater than or equal to 1 mm. This arrangement ensures that the extension member 104 has a certain structural strength and avoids the assembly of the cover plate body 10 being too small.

[0045] In one embodiment, combined with Figure 1 , Figures 4 to 6 The cover plate body 10 is provided with a deformation zone, which includes at least one groove opened on the inner end face of the cover plate body 10. The groove makes it easy for the cover plate body 10 to deform at the deformation zone when subjected to external impact.

[0046] By creating at least one groove on the inner end face of the cover plate body 10, the thickness of the cover plate body 10 in the deformation zone is reduced. When the cover plate body 10 is subjected to external impact, the deformation zone is more likely to deform than other parts of the cover plate body 10, thereby absorbing the impact energy. This can prevent the cover plate body 10 from being directly subjected to a large impact force and breaking or causing the connection between the cover plate and the shell 20 to fail, thus effectively ensuring the stability of the overall battery structure.

[0047] Understandably, the deformation zone can be flexibly set according to the battery's installation position on the vehicle. Since the battery is installed at different angles on the vehicle, the parts of the battery that are susceptible to impact are also different. The deformation zone should be set on the side of the cover body 10 that is susceptible to impact.

[0048] For example, combined Figure 1 , Figures 4 to 6 The groove in the deformation zone can also be configured to be close to the explosion-proof valve 101 on the cover plate body 10, that is, the groove is located on one side of the explosion-proof valve 101. This configuration can protect the explosion-proof valve 101. When subjected to external impact, the groove in the deformation zone is used to absorb the energy of the external impact, which can prevent the explosion-proof valve 101 from being damaged or failing due to impact.

[0049] For example, a connecting edge 102 is provided on the outer peripheral end face (both end faces along the length direction and both end faces along the width direction) of the cover plate body 10. The inner end face of the connecting edge 102 is higher than the inner end face of the cover plate body 10. The connecting edge 102 is used to cooperate with the battery housing 20 to achieve connection. Further, the connection method between the connecting edge 102 and the housing 20 is welding.

[0050] In an example scheme, such as Figure 4 As shown, the groove in the deformation zone includes a first functional groove 11. The first functional groove 11 is formed on the inner end face of the cover plate body 10. At least one end of the first functional groove 11 penetrates the edge of the cover plate body 10 in the width direction. This arrangement makes it easy for the cover plate body 10 to deform at the first functional groove 11, so as to absorb external impact energy.

[0051] For example, the first functional groove 11 extends through the cover body 10 at both ends in the width direction of the cover body 10.

[0052] For example, the first functional groove 11 is formed on the cover plate body 10 by means of stamping or machining.

[0053] For example, refer to Figure 4The distance d1 from the first functional groove 11 along the length of the cover body 10 to the nearest edge of the cover body 10 is greater than 0 mm, and the dimension d2 of the first functional groove 11 along the thickness of the cover body 10 satisfies 0 mm < d2 ≤ 3 mm. This design ensures that the cover body 10 has a certain structural strength to prevent it from easily breaking, and also provides a deformation buffer when subjected to external impact.

[0054] Furthermore, the first functional groove 11 is formed on the inner end face of the cover plate body 10 and is located on one side of the inner end face of the cover plate body 10 in the length direction. More specifically, it is located on the side of the cover plate body 10 in the length direction near the inner shell wall of the housing 20 that is easily subjected to external impact, that is, the inner shell wall of the housing 20 on one side of the cover plate body 10 in the length direction. The first functional groove 11 penetrates the edge of the cover plate body 10 at one end near the inner shell wall. This arrangement makes the inner end face of the cover plate body 10 have a weak area with a partially cut structure on one side in the length direction, so that the cover plate body 10 is easy to bend and deform at one end of the groove wall of the first functional groove 11 in the length direction, thereby absorbing the energy of external impact.

[0055] Since the length direction of the cover body 10 is usually the direction in which the battery is easily subjected to external impact when it is installed on the vehicle, it should not be understood that the first functional groove 11 can only be opened on one side of the inner shell wall of the housing 20 in the length direction of the cover body 10. Alternatively, depending on the installation angle of the battery, the first functional groove 11 can be opened on one side of the inner shell wall of the housing 20 in the width direction of the cover body 10. That is, the length direction and width direction in this application can be flexibly adjusted.

[0056] For example, the first functional groove 11 extends through the cover body 10 at both ends in the width direction of the cover body 10.

[0057] For example, the first functional groove 11 is formed on the cover plate body 10 by means of stamping or machining.

[0058] Furthermore, referring to Figure 5 The distance d3 from the first functional groove 11 along the length of the cover body 10 to the explosion-proof valve 101 is greater than 0 mm, and the dimension d4 of the first functional groove 11 in the thickness direction of the cover body 10 satisfies 0 mm < d4 ≤ 3 mm. This setting can avoid the first functional groove 11 being too close to the explosion-proof valve 101, which would affect the welding of the explosion-proof valve 101, and can make the cover body 10 more prone to deformation at the first functional groove 11, so as to absorb external impact energy.

[0059] In an example scheme, such as Figure 6As shown, the grooves in the deformation zone include a second functional groove 12 and a third functional groove 13. The second functional groove 12 is provided on the inner end surface of the cover plate main body 10, and the third functional groove 13 is opened in the second functional groove 12. The third functional groove 13 is formed on the groove bottom of the second functional groove 12 (that is, the side groove wall in the thickness direction of the cover plate main body 10). It can be understood that the thickness dimension of the cover plate main body 10 at the third functional groove 13 is smaller than that at the second functional groove 12.

[0060] When the cover plate main body 10 is subjected to external impact, the cover plate main body 10 is more prone to deformation and bending at the third functional groove 13 than at the second functional groove 12, which can provide a first-stage buffering effect, and the second functional groove 12 can provide a second-stage buffering effect, which is beneficial for improving the structural integrity of the cover plate main body 10 when subjected to external impact, and avoids safety problems caused by connection failure between the cover plate and the housing 20.

[0061] Exemplarily, the centers of the groove bottoms of the second functional groove 12 and the third functional groove 13 coincide.

[0062] Exemplarily, both the second functional groove 12 and the third functional groove 13 are square grooves, and neither the second functional groove 12 nor the third functional groove 13 penetrates the cover plate main body 10 in the length direction and the width direction. The orthographic projection of the second functional groove 12 and the third functional groove 13 in the thickness direction of the cover plate main body 10 is in a "square-ring" shape.

[0063] Exemplarily, the second functional groove 12 and the third functional groove 13 are formed on the cover plate main body 10 by stamping, machining or other methods.

[0064] Exemplarily, the depth dimension of the second functional groove 12 in the thickness direction of the cover plate main body 10 is ≤ 3 mm, and the depth dimension of the third functional groove 13 relative to the groove bottom of the second functional groove 12 in the thickness direction of the cover plate main body 10 is ≤ 3 mm. Such arrangement enables the cover plate main body 10 to deform easily, so as to absorb external impact energy.

[0065] Exemplarily, the dimension of the second functional groove 12 in the length direction of the cover plate main body 10 is ≥ 1 mm, and the dimension of the second functional groove 12 in the width direction of the cover plate main body 10 is ≥ 1 mm. Such arrangement facilitates stamping processing on the one hand, and on the other hand can prevent the second functional groove 12 from being too close to the edge of the cover plate main body 10 and affecting the external dimension of the cover plate main body 10.

[0066] Exemplarily, the distance d5 between adjacent groove walls of the second functional groove 12 and the third functional groove 13 in the length direction and / or width direction of the cover plate main body 10 is ≥ 1 mm. Such arrangement can ensure effective forming of the second functional groove 12 and the third functional groove 13, so that the second functional groove 12 and the third functional groove 13 have a good buffering effect.

[0067] For example, the second functional slot 12 and the third functional slot 13 are positioned on the cover body 10 close to one side of the inner shell wall of the housing 20 in the length direction of the cover body 10.

[0068] In an example scheme, such as Figure 1 As shown, the groove in the deformation zone includes a fourth functional groove 15. The fourth functional groove 15 is located on the side close to the protrusion 14 and is adjacent to the protrusion 14. That is, one side of the groove wall of the fourth functional groove 15 in the length direction of the cover plate body 10 is flush with the end face of the protrusion 14 on the side close to the fourth functional groove 15. The fourth functional groove 15 can absorb impact energy and prevent the cover plate body 10 from being directly subjected to a large impact force and breaking or causing the connection between the cover plate and the housing 20 to break.

[0069] For example, the fourth functional slot 15 extends through the cover plate body 10 at both ends in the width direction.

[0070] For example, the fourth functional groove 15 has a transition chamfer 151 at the connection with the protrusion 14. Further, the radius of the transition chamfer 151 is ≥0.1mm. This setting facilitates the forming of the fourth functional groove 15 and the protrusion 14, and can effectively avoid stress concentration at the connection between the protrusion 14 and the cover plate body 10. The transition chamfer 151 can play a transition role, which helps to ensure structural stability.

[0071] For example, the fourth functional groove 15 has a length dimension ≥ 1 mm along the length direction of the cover plate body 10, and the thickness dimension of the cover plate body 10 is ≥ 0.1 mm at the opening of the fourth functional groove 15. This arrangement allows the cover plate body 10 to easily deform, thereby absorbing external impact energy.

[0072] In one embodiment, reference is made to Figure 7 The present invention also proposes a battery, including a housing 20 and a cover plate connected to an opening on one side of the housing 20. The cover plate includes the aforementioned cover plate body 10, so as to ensure the stability of the connection between the cover plate and the housing 20 when subjected to external impact.

[0073] In one embodiment, such as Figure 7 As shown, the present invention also proposes a battery, including a housing 20 and a positive electrode cover plate and a negative electrode cover plate connected to both ends of the housing 20, wherein at least one of the positive electrode cover plate and the negative electrode cover plate includes the aforementioned cover plate body 10.

[0074] Furthermore, based on the battery of the two embodiments of the present invention described above, the housing 20 includes a first housing member 21 and a second housing member 22. The two first housing members 21 are opposite each other along the width direction of the cover plate body 10, and the two second housing members 22 are opposite each other along the length direction of the cover plate body 10. The two first housing members 21 and the two second housing members 22 are connected and enclosed to form the housing 20. The end face area of ​​the first housing member 21 is greater than the end face area of ​​the second housing member 22, and the thickness of the first housing member 21 is less than or equal to the thickness of the second housing member 22.

[0075] For example, the thickness of the first shell 21 and the second shell 22 is greater than 0.35 mm to ensure the structural strength of the shell.

[0076] For example, the housing 20 is configured with unequal thickness by means of hot extrusion or cold drawing.

[0077] For example, the battery proposed in this invention can be a blade battery.

[0078] When the battery is installed on a vehicle, the second shell 22 is usually susceptible to external impact, which affects the connection quality between the second shell 22 and the cover plate. By increasing the thickness of the second shell 22, the displacement intrusion of the second shell 22 when subjected to external impact can be reduced. The aforementioned deformation zone and / or reinforcement zone are arranged on the side of the cover plate body 10 near the inner wall of the second shell 22.

[0079] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A battery cover, characterized in that, The device includes a cover plate body (10), which has a reinforcing area. The reinforcing area includes at least one protrusion (14) protruding from the inner end face of the cover plate body (10). The protrusion (14) extends along the thickness direction of the cover plate body (10). At least one of the protrusions (14) is close to the inner shell wall of the battery housing (20). A terminal post (103) is installed on the cover plate body (10). An extension (104) protrudes from the inner end face of the terminal post (103). The extension (104) extends protruding along the thickness direction of the cover plate body (10) and is close to the inner shell wall of the housing (20).

2. The battery cover according to claim 1, characterized in that, The cover plate body (10) is provided with a deformation area, which includes at least one groove formed on the inner end face of the cover plate body (10).

3. The battery cover according to claim 2, characterized in that, The groove includes a first functional groove (11) that penetrates at least one end of the cover plate body (10) in the width direction.

4. The battery cover according to claim 3, characterized in that, The first functional groove (11) is located near the inner shell wall of the housing (20) on one side of the cover body (10) along the length direction, and the first functional groove (11) penetrates the cover body (10) on the side near the inner shell wall.

5. The battery cover according to claim 2, characterized in that, The groove includes a second functional groove (12) and a third functional groove (13). The second functional groove (12) is opened on the inner end face of the cover plate body (10), and the third functional groove (13) is opened at the bottom of the second functional groove (12).

6. The battery cover according to claim 5, characterized in that, The bottom of the second functional slot (12) and the bottom of the third functional slot (13) coincide in center.

7. The battery cover according to claim 2, characterized in that, The groove includes a fourth functional groove (15), which is located on the side close to the protrusion (14), and one side wall of the fourth functional groove (15) is flush with the end face of the protrusion (14) on the side close to the fourth functional groove (15).

8. A battery, characterized in that, It includes a housing (20) and a battery cover as described in any one of claims 1 to 7, wherein the cover body (10) is connected to one end of the housing (20).

9. A battery, characterized in that, It includes a housing (20) and a positive electrode cover plate and a negative electrode cover plate connected to both ends of the housing (20), wherein at least one of the positive electrode cover plate and the negative electrode cover plate is the battery cover plate according to any one of claims 1 to 7.

10. The battery according to claim 9, characterized in that, The housing (20) includes a first housing member (21) and a second housing member (22), wherein the end face area of ​​the first housing member (21) is greater than the end face area of ​​the second housing member (22), and the thickness of the first housing member (21) is less than or equal to the thickness of the second housing member (22).

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