Battery cover plate assembly and battery comprising same

Abstract

The utility model relates to the technical field of batteries, and particularly provides a battery cover plate assembly and a battery comprising the same. The battery cover plate assembly comprises a battery cover plate, a sealing rubber nail and a sealing piece, the battery cover plate is provided with a liquid injection hole, and the liquid injection hole comprises a sinking groove and a hole channel; the sealing rubber nail comprises a nail cap and a nail rod, the nail rod penetrates through the hole channel and is in sealing connection with the hole channel, the nail cap covers the hole channel and abuts against the sinking groove, and a demolding groove is formed in the end, away from the nail cap, of the nail rod. And the sealing sheet is welded and sealed with the sinking groove and covers the nail cap. The sealing rubber nail is provided with the demolding groove, demolding during manufacturing is facilitated, stress concentration of the tip end of the nail rod can be reduced, and burrs and burrs are avoided; a sinking groove is formed in the liquid injection hole and abuts against a nail cap of the sealing rubber nail, so that the sealing rubber nail is prevented from falling into the battery shell; the sealing glue nail and the sealing piece form double sealing on the liquid injection hole, the sealing glue nail and the sealing piece avoid each other, the sealing effect is enhanced, and small space is occupied; the sealing piece is welded with the sinking groove, connection is firm, the sealing rubber nail is prevented from being disengaged, and the sealing performance is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and particularly discloses a battery cover plate assembly and a battery comprising the same. BACKGROUND

[0002] With the development of technology, batteries have been widely used in electronic devices, electric vehicles and other fields, and the market has continuously put forward higher requirements for the performance and safety of batteries.

[0003] In the related art, some batteries need to use plastic nails to seal the injection holes after injecting electrolyte into the shell. However, when the plastic nails are manufactured, the tips thereof are prone to burrs. When the battery is assembled or used subsequently, the burrs on the plastic nails or the plastic nails as a whole may fall into the interior of the battery shell, thereby easily damaging the positive and negative electrode plates and causing adverse conditions such as short circuit of the battery cell. UTILITY MODEL CONTENT

[0004] The present application aims to solve at least part of the technical problems mentioned above, and the purpose is achieved by the following technical solutions:

[0005] In a first aspect, the present application provides a battery cover plate assembly, which comprises a battery cover plate, a sealing glue nail and a sealing sheet. The battery cover plate has an injection hole, and the injection hole comprises a sink groove and a hole channel which are axially communicated. The inner diameter of the sink groove is greater than the inner diameter of the hole channel. The sealing glue nail comprises a nail cap and a nail rod which are axially connected. The diameter of the nail cap is greater than the diameter of the nail rod. The nail rod penetrates the hole channel and is sealingly connected with the hole channel. The nail cap covers the hole channel and abuts against the sink groove. The end of the nail rod away from the nail cap is provided with a demolding groove. The sealing sheet is welded and sealed with the sink groove and covers the nail cap.

[0006] In some embodiments, the nail rod comprises a sealing segment and a guide segment which are axially connected. The sealing segment is located between the nail cap and the guide segment. The guide segment is provided with the demolding groove, and the sealing segment is sealingly connected with the hole channel.

[0007] In some embodiments, the demolding groove is provided with at least one, and the demolding groove is any one of a cylindrical groove, a circular ring-shaped groove, a conical groove and a square groove, or a combination of any two or more thereof.

[0008] In some embodiments, the sealing glue nail is of an elastic structure, and satisfies: 1mm≤the inner diameter of the hole channel≤the diameter of the guide segment≤the diameter of the sealing segment<the diameter of the nail cap≤10mm.

[0009] In some embodiments, the sealing segment is connected with the hole channel in an interference fit, and the interference amount a thereof satisfies: 0mm

[0010] In some embodiments, the guiding section has an axial dimension T1, the demolding groove has an axial dimension T2, and the following conditions are satisfied: 0.05mm≤T2≤T1≤5mm, 0.02≤T2 / T1≤1, and 0.05mm≤T2≤5mm.

[0011] In some embodiments, the demolding groove is a cylindrical groove, the guiding section has an end face with a diameter D1 at one end of the demolding groove, and the demolding groove has an inner diameter D2, and the following conditions are satisfied: 0.1mm≤D2<D1<10mm, 0.1≤D2 / D1<1, and 0.1mm<D1<10mm.

[0012] In some embodiments, the guiding section has a thinning portion and a guiding portion, the guiding portion transitions the surface of the thinning portion, and the guiding section has an end face at one end of the demolding groove; at least the guiding portion and the demolding groove form a thin-walled contraction structure.

[0013] In some embodiments, the sealing sheet has a relief groove on the side face facing the sealing rubber peg, and the relief groove has a protruding portion facing the sealing rubber peg; the peg cap has a groove, and the peg cap is accommodated in the relief groove, and the groove abuts against the protruding portion.

[0014] In some embodiments, the groove and the protruding portion are in interference fit, and the interference amount b satisfies: 0.1mm≤b≤1.5mm.

[0015] In a second aspect, the application provides a battery including the battery cover plate assembly of the first aspect.

[0016] The technical solutions provided by the application have at least the following technical effects:

[0017] In the application, the end of the peg rod of the sealing rubber peg is provided with a demolding groove, which facilitates the demolding operation during the manufacturing of the sealing rubber peg, and can reduce the stress concentration effect of the tip of the peg rod and avoid the occurrence of burrs and burrs; in addition, the injection hole is provided with a sink on the hole channel, so as to abut against the peg cap of the sealing rubber peg, effectively preventing the sealing rubber peg and the burrs thereon from falling into the battery shell; in addition, the sealing rubber peg and the sealing sheet form a double-sealing structure for the injection hole, and the two mutually avoid each other, not only enhancing the sealing effect, but also occupying a smaller space; at the same time, the sealing sheet is welded with the edge of the sink, the structure is connected and fastened, which can also prevent the sealing rubber peg from coming out, and further improve the sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to better combine the content shown in the drawings of the specification with the content described in the specific embodiments, the drawings of the specification are briefly introduced as follows. It can be understood that the drawings of the specification mentioned below only schematically show the related technical solutions and some embodiments in the technical solutions of the application, and under the premise of not paying creative labor, the person skilled in the art can also make drawings showing other embodiments.

[0019] Specifically, the annotations of the figures in the specification are as follows:

[0020] Figure 1 An exploded view of a battery as described in some embodiments of the present application;

[0021] Figure 2 A partial view of a battery cover plate assembly as described in some embodiments of the present application;

[0022] Figure 3 An axial cross-sectional view of a sealant pin as described in a first embodiment of the present application;

[0023] Figure 4 An axial view of a sealant pin as described in a second embodiment of the present application;

[0024] Figure 5 An axial cross-sectional view of a sealant pin as described in a third embodiment of the present application;

[0025] Figure 6 An axial cross-sectional view of a sealant pin as described in a fourth embodiment of the present application.

[0026] Specifically, the annotations of the figures in the specification are as follows:

[0027] 100, battery; 110, battery cover plate assembly; 120, battery housing; 130, battery cell; 111, battery cover plate; 112, sealant pin; 113, sealing sheet; 1121, pin cap; 1122, pin rod; 11221, sealing section; 11222, guiding section; K, liquid injection hole; K1, sink; K2, hole; B1, thinning part; B2, guiding part; B3, protruding part; C1, demolding groove; C2, avoiding groove; C3, groove; M1, wide surface; M2, narrow surface. DETAILED DESCRIPTION

[0028] To make the content of the embodiments of the present application clearer, the following will be described with reference to the drawings in the specification. It is to be understood that the following mentioned content is only some embodiments of the present application, and all the embodiments are not exhaustively listed. Therefore, other embodiments obtained based on the following embodiments fall within the protection scope of the present application without creative labor.

[0029] It should be understood that the terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the technical solutions, unless the context clearly dictates otherwise. For example, the terms "one", "a", and "said" used herein to modify a feature do not exclude that there can be a plurality of such features in other embodiments.

[0030] It should be understood that the terms "comprising," "including," and "having" are open-ended, indicating the presence of the stated features but not excluding the possibility of other features in the embodiment. Similarly, the use of terms such as "first," "second," etc., to describe multiple features only indicates the distinction between one feature and another, and such terms do not imply order or sequence unless explicitly stated in the context.

[0031] It should be understood that, unless the context clearly indicates otherwise, the terms "setup," "connection," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a direct connection or an indirect connection via a medium. Those skilled in the art will understand the specific meaning of these terms in this document based on the specific circumstances.

[0032] In addition, for ease of description, the text will use terms of spatial relative relationship to describe the position of one feature relative to another feature, such as "inner", "outer", "end", "side", "upper", "middle", "lower", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations besides those shown in the accompanying drawings of the specification.

[0033] The embodiments of this application will now be described with reference to the accompanying drawings.

[0034] Firstly, referring to Figure 1 and Figure 2 Key reference Figure 2 This application proposes a battery 100, which includes a battery cover plate 111, a sealing nail 112, and a sealing sheet 113. The battery cover plate 111 has an injection hole K, which includes an axially connected groove K1 and a channel K2. The inner diameter of the groove K1 is larger than the inner diameter of the channel K2. The sealing nail 112 includes an axially connected nail head 1121 and a nail rod 1122. The diameter of the nail head 1121 is larger than the diameter of the nail rod 1122. The nail rod 1122 passes through the channel K2 and is sealed to the channel K2. The nail head 1121 covers the channel K2 and abuts against the groove K1. The end of the nail rod 1122 away from the nail head 1121 is provided with a demolding groove C1. The sealing sheet 113 is welded and sealed to the groove K1 and covers the nail head 1121.

[0035] Specifically, the nail cap 1121 has a first surface and a second surface opposite along the thickness direction thereof; in some embodiments, the first surface of the nail cap 1121 is provided with a groove C3 to cooperate with the protrusion B3 on the sealing sheet 113, and this structure will be further described later; in some embodiments, the second surface of the nail cap 1121 is connected to the nail rod 1122 at the center position thereof, and the peripheral area of the second surface is in abutment with the sink K1. In addition, in some embodiments, the sealing sheet 113 is generally a flat aluminum nail, which can ensure the structural strength and facilitate welding with the battery cover plate 111.

[0036] In the present embodiment, the end of the nail rod 1122 of the sealing glue nail 112 is provided with a demolding groove C1, which facilitates the demolding operation during the manufacturing of the sealing glue nail 112, and can also reduce the stress concentration effect of the tip of the nail rod 1122, thereby avoiding the occurrence of burrs and burrs; in addition, the sink K1 is arranged on the hole K2, so as to be in abutment with the nail cap 1121 of the sealing glue nail 112, thereby effectively preventing the sealing glue nail 112 and the burrs thereon from falling into the battery shell 120; in addition, the sealing glue nail 112 and the sealing sheet 113 form a double-sealing structure for the liquid injection hole K, and the two are mutually avoided, which not only enhances the sealing effect, but also occupies a smaller space; at the same time, the sealing sheet 113 is welded with the edge of the sink K1, which is a structure connection fastening, and can also prevent the sealing glue nail 112 from falling out, and further improve the sealing performance.

[0037] In summary, the scheme provided in the present application at least solves the problem that the sealing glue nail 112 and the burrs on the surface thereof fall into the battery shell 120, and improves the production efficiency of the sealing glue nail 112 and the stability of the production quality thereof, and also improves the performance, safety and service life of the battery 100 during assembly and use.

[0038] In some embodiments, the nail rod 1122 includes an axial sealing segment 11221 and a guide segment 11222 connected in series, the sealing segment 11221 is located between the nail cap 1121 and the guide segment 11222, the guide segment 11222 is provided with a demolding groove C1, and the sealing segment 11221 is in sealing connection with the hole K2. In some embodiments, the demolding groove C1 is provided with at least one, and the demolding groove C1 is any one of a cylindrical groove, a circular ring groove, a conical groove, a square groove, or a combination of any two or more thereof. In some embodiments, the sealing glue nail 112 is an elastic structure, and satisfies: 1mm≤the inner diameter of the hole K2≤the diameter of the guide segment 11222≤the diameter of the sealing segment 11221<the diameter of the nail cap 1121≤10mm. In some embodiments, the sealing segment 11221 is in interference fit connection with the hole K2, and the interference amount a satisfies: 0mm<a≤1.5mm.

[0039] In the above embodiments, the guiding section 11222 is thinner than the sealing section 11221, facilitating the passing of the hole K2 and playing a guiding role, and the sealing section 11221 is relatively thicker, which can be tightly sealed with the hole K2, but the interference a of the two should be moderate, not too large or too small, otherwise it is difficult to assemble or not to seal well, for example, the interference a can be any one of 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm or a range between any two of them.

[0040] In addition, the diameter of the hole K2 should not be too large, otherwise it will result in low strength of the battery cover plate 111, and the diameter of the hole K2 should not be too small, otherwise it will make it difficult to inject liquid, so the diameter of the hole K2 should be moderate, for example, the diameter of the hole K2 can be any one of 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 9.5mm, 9.8mm or a range between any two of them.

[0041] It should be noted that, referring to Figure 3 , the demolding groove C1 is a cylindrical groove; referring to Figure 4 , the demolding groove C1 is five cylindrical grooves; referring to Figure 5 , the demolding groove C1 is a combination of concentric and connected cylindrical grooves and annular grooves, it can be understood that the demolding groove C1 can also be only an annular groove; referring to Figure 6 , the demolding groove C1 is a conical groove; the above is only a partial display of the form of the demolding groove C1, and the number and shape are not limited, all of which belong to the protection scope of the present application.

[0042] In some embodiments, the guiding section 11222 has an axial dimension T1, the demolding groove C1 has an axial dimension T2, and satisfies: 0.05mm≤T2≤T1≤5mm, 0.02≤T2 / T1≤1, 0.05mm≤T2≤5mm. In some embodiments, the demolding groove C1 is a cylindrical groove, the guiding section 11222 is provided with an end face of one end of the demolding groove C1 with a diameter D1, and the inner diameter of the demolding groove C1 is D2, and satisfies: 0.1mm≤D2<D1<10mm, 0.1≤D2 / D1<1, 0.1mm<D1<10mm. In some embodiments, the guiding section 11222 has a thinning portion B1 and a guiding portion B2, the surface of the guiding portion B2 transitions the thinning portion B1, and the guiding section 11222 is provided with an end face of one end of the demolding groove C1; at least the guiding portion B2 and the demolding groove C1 form a thin-walled contraction structure.

[0043] In the above embodiments, the length and diameter of the guide section 11222 should be moderate, otherwise if the length of the guide section 11222 is too long, it will extend into the battery shell 120 more, interfering with other components, and if it is too short, it is difficult to play a guiding role; similarly, the diameter of the guide section 11222 is too large or too small, it is difficult to play a good guiding effect; therefore, in some embodiments, the length T1 of the guide section 11222 can be any one of 0.05mm, 1mm, 2mm, 3mm, 4mm, 5mm or a range between any two of them, and the diameter D1 of the guide section 11222 can be any one of 0.1mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or a range between any two of them.

[0044] In addition, as shown in Figure 4 , the guide section 11222 can be cut in the circumferential direction and form a thinning portion B1, which is convenient for assembly, and the thinning portion B1 and the end face of the nail rod 1122 are transitioned by the guide portion B2, which has a smooth curved surface, plays a smooth guiding role, and avoids the seal glue nail 112 having sharp corners.

[0045] It should be noted that the demolding groove C1 can only extend to the guide portion B2, or it can extend to the thinning portion B1 and form a thin-walled shrink structure, further enhancing the convenience of assembly; it can be understood that the length and inner diameter of the demolding groove C1 are limited by the size of the guide section 11222, so they should also be moderate, avoiding problems such as poor demolding effect during manufacturing, poor shrinkage of the thin-walled shrink structure during assembly, and assembly difficulty, and avoiding the guide section 11222 having low strength due to its long length and / or large inner diameter, for example, the length T2 can be any one of 0.05mm, 1mm, 2mm, 3mm, 4mm, 5mm or a range between any two of them, and the inner diameter D2 can be any one of 0.1mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or a range between any two of them.

[0046] Specifically, in some embodiments, referring to Figure 4 , the thinning portion B1 formed by cutting has three wide faces M1 and three narrow faces M2, which are alternately distributed along the circumferential direction; more specifically, in some embodiments, the narrow face M2 is smoothly transitioned with the circumferential surface of the sealing section 11221, and the narrow face M2 is smoothly transitioned with the curved surface of the guide portion B2.

[0047] In some embodiments, referring to Figure 2 and Figure 3 , and Figure 2The side of the sealing sheet 113 facing the sealing glue nail 112 is provided with a avoiding groove C2, and the avoiding groove C2 is provided with a protruding part B3 facing the sealing glue nail 112; the nail cap 1121 is provided with a groove C3, the nail cap 1121 is accommodated in the avoiding groove C2, and the groove C3 is in abutment with the protruding part B3. In some embodiments, the groove C3 and the protruding part B3 are in interference fit, and the interference amount b satisfies: 0.1mm≤b≤1.5mm.

[0048] Specifically, in some embodiments, the depth of the avoiding groove C2 is less than the depth of the sink groove K1, and the depth of the sink groove K1 is greater than or equal to the thickness of the sealing sheet 113, so that the sealing sheet 113 can be completely accommodated in the sink groove K1; in addition, in some embodiments, the protruding part B3 is semispherical or semielliptical, and the protruding height of the protruding part B3 is less than or equal to the depth of the avoiding groove C2. It can be understood that the height of the protruding part B3 can also be greater than the depth of the avoiding groove C2, as long as the size of the protruding part B3 matches the size of the groove C3 on the nail cap 1121. In particular, in some embodiments, the thickness of the nail cap 1121 is less than or equal to the depth of the avoiding groove C2, so that the nail cap 1121 can be completely accommodated in the avoiding groove C2; in some embodiments, the peripheral surface of the nail cap 1121 can be in close contact with the side wall of the avoiding groove C2. It can be understood that there can be a gap between the two, so as to absorb the heat generated when the sealing sheet 113 and the battery cover plate 111 are welded and fixed.

[0049] In the above embodiments, the sealing sheet 113 abuts against the sealing glue nail 112, so that the nail cap 1121 of the sealing glue nail 112 is completely fixed under the action of the sealing sheet 113 and the sink groove K1, avoiding the sealing glue nail 112 from being pulled out outward due to vibration during use of the battery 100, resulting in sealing failure; in addition, the interference amount b of the sealing sheet 113 and the sealing glue nail 112 should be moderate, otherwise the nail cap 1121 can be damaged due to excessive interference, or the sealing glue nail 112 can be loose due to insufficient interference, affecting the sealing effect. For example, the interference amount b can be any one of 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm or a range between any two values.

[0050] In a second aspect, the application provides a battery 100 comprising the battery cover plate assembly 110 of the first aspect.

[0051] It should be noted that the battery 100 of the second aspect comprises the battery cover plate assembly 110 of the first aspect, and therefore the battery 100 of the second aspect at least has all the technical effects of the battery cover plate assembly 110 of the first aspect, and the specific technical effects will not be described here.

[0052] The embodiments of the present application only illustrate the structure of the battery 100 related to the improvement points of the present application in the second aspect, but do not mean that the battery 100 does not have other structures. For example, the battery 100 further comprises a battery shell 120 connected with the battery cover plate assembly 110, a battery cell 130 located inside the battery shell 120, and the like. Other structures are not described one by one here.

[0053] In particular, the term "and / or" in the present application should be understood as follows:

[0054] In the first case, the term "and / or" between the first subject and the second subject includes any of the following meanings: (1) only the first subject; (2) only the second subject; and (3) the first subject and the second subject.

[0055] In the second case, the term "and / or" between the last two subjects in three or more subjects means that at least any one of the plurality of subjects is included. For example, "the first subject, the second subject and / or the third subject" has the same meaning as "the first subject and / or the second subject and / or the third subject", which specifically includes the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) the first subject and the second subject and no third subject; (5) the first subject and the third subject and no second subject; (6) the second subject and the third subject and no first subject; and (7) the first subject, the second subject and the third subject.

[0056] In addition, the character " / " in the present application generally indicates that the associated objects before and after it are in an "or" relationship.

[0057] Finally, although the embodiments of the present application are described above in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the concept of the present application, and such modifications and changes are also within the scope of protection of the present application.

Claims

1. A battery cover plate assembly, characterized by, The battery cover plate (111) has a liquid injection hole (K) including an axially communicating sink (K1) and a hole channel (K2), the inner diameter of the sink (K1) is greater than the inner diameter of the hole channel (K2); The sealant pin (112) includes an axially connected pin cap (1121) and a pin shaft (1122), the diameter of the pin cap (1121) is greater than the diameter of the pin shaft (1122), the pin shaft (1122) penetrates the hole channel (K2) and is sealingly connected with the hole channel (K2), the pin cap (1121) covers the hole channel (K2) and abuts against the sink (K1), and the end of the pin shaft (1122) away from the pin cap (1121) is provided with a demolding groove (C1); The sealing sheet (113) is welded and sealed with the sink (K1) and covers the pin cap (1121). The pin shaft (1122) includes a sealing segment (11221) and a guide segment (11222) connected in an axial direction, the sealing segment (11221) is located between the pin cap (1121) and the guide segment (11222), the guide segment (11222) is provided with the demolding groove (C1), and the sealing segment (11221) is sealingly connected with the hole channel (K2).

2. The battery cover plate assembly of claim 1, wherein, The demolding groove (C1) is provided with at least one, and the demolding groove (C1) is any one of a cylindrical groove, a circular ring-shaped groove, a circular conical groove, a square groove, or a combination of any two or more thereof.

3. The battery cover plate assembly of claim 2, wherein, The sealant pin (112) is an elastic structure, and satisfies: 1mm≤the inner diameter of the hole channel (K2)≤the diameter of the guide segment (11222)≤the diameter of the sealing segment (11221)<the diameter of the pin cap (1121)≤10mm.

4. The battery cover plate assembly of claim 2, wherein, The sealing segment (11221) is connected with the hole channel (K2) in an interference fit, and the interference amount a satisfies: 0mm<a≤1.5mm.

5. The battery cover plate assembly of claim 4, wherein, The guide segment (11222) has an axial dimension T1, and the demolding groove (C1) has an axial dimension T2, and satisfies: 0.05mm≤T2≤T1≤5mm, 0.02≤T2 / T1≤1, 0.05mm≤T2≤5mm.

6. The battery cover plate assembly of claim 2, wherein, The demolding groove (C1) is a cylindrical groove, the guide segment (11222) is provided with an end face of one end of the demolding groove (C1) with a diameter D1, and the inner diameter of the demolding groove (C1) is D2, and satisfies: 0.1mm≤D2<D1<10mm, 0.1≤D2 / D1<1, 0.1mm<D1<10mm.

7. The battery cover plate assembly of claim 3, wherein, The guide segment (11222) has a thinning portion (B1) and a guide portion (B2), the guide portion (B2) is connected to the surface of the thinning portion (B1) and the end face of one end of the guide segment (11222) provided with the demolding groove (C1); 8. The battery cover plate assembly of claim 2, wherein, At least the guide portion (B2) and the demolding groove (C1) form a thin-walled contraction structure. ​ 9. The battery cover plate assembly of claim 1, wherein, The sealing sheet (113) is provided with a relief groove (C2) on one side surface thereof facing the sealing glue nail (112), and a protruding portion (B3) is arranged in the relief groove (C2) and faces the sealing glue nail (112); The nail cap (1121) is provided with a groove (C3), the nail cap (1121) is accommodated in the relief groove (C2), and the groove (C3) is in abutment with the protruding portion (B3).

10. The battery cover plate assembly of claim 9, wherein, The groove (C3) and the protruding portion (B3) are in interference fit, and the interference amount b satisfies: 0.1mm≤b≤1.5mm.

11. A battery, characterized by The battery (100) comprises the battery cover plate assembly (110) according to any one of claims 1 to 10.

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