Battery end cover structure and battery

Abstract

The present application relates to the field of battery technology, and in particular to a battery end cover structure and a battery, wherein the battery end cover structure includes an end cover body, a pole, a connecting block and a first insulating member. The first insulating member is coated on the side of the connecting block facing the end cover body, a first protrusion is provided on the side of the first insulating member facing the end cover body, and a first groove adapted to the first protrusion is provided at a corresponding position on the side of the end cover body facing the connecting block. Part of the pole passes through the end cover body and is connected to the connecting block along a first direction, and when the pole and the connecting block are in a connected state, the first protrusion is embedded in the first groove. According to the battery end cover structure and the battery provided by the present application, through the connection effect of the first protrusion and the first groove, the connection area between the end cover body and the first insulating member is increased, the connection stability between the first insulating member and the end cover body is improved, the flatness of the connecting block is significantly improved, and the resistance stability of the assembly structure of the connecting block and the pole is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery end cover structure and a battery. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in the field of electric vehicles. The structural parts of lithium-ion batteries are also an important part of lithium-ion power batteries. They not only provide protection for lithium-ion batteries in terms of safety and reliability, but also take into account the connection between the internal chemical system of lithium-ion batteries and external modules. The battery cover of lithium-ion batteries is an important component of lithium-ion batteries. Therefore, how to ensure the stability of the battery cover has become a technical problem that needs to be solved urgently.

[0003] The existing cover plate is provided with a pole assembly, which usually includes poles and connecting blocks riveted to each other for battery power transmission. Under the riveting force of the pole, the connecting block is prone to warping, deformation, and flatness size deviation. The palladium sheet welding is prone to explosion holes and cold welding, causing excessive overcurrent temperature rise at the weld mark, and in severe cases, thermal runaway. Summary of the invention

[0004] The purpose of the present application is to provide a battery end cover structure and a battery, so as to solve the technical problems existing in the prior art to a certain extent, that the connection block is very likely to be warped, deformed, and have excessive flatness under the riveting force of the pole, and that the welding of palladium sheets is prone to voids and cold welds, causing excessive overcurrent temperature rise at the weld mark, and even thermal runaway in severe cases.

[0005] According to a first aspect of the present application, there is provided a battery end cap structure, comprising an end cap body, a pole, a connection block and a first insulating member, wherein the first insulating member is coated on a side of the connection block facing the end cap body, a first protrusion is provided on a side of the first insulating member facing the end cap body, and a first groove adapted to the first protrusion is provided at a corresponding position of a side of the end cap body facing the connection block;

[0006] Part of the pole passes through the end cover body along a first direction and is connected to the connection block. When the pole and the connection block are in a connected state, the first protrusion is embedded in the first groove.

[0007] Preferably, the end cover body and the connection block are connected via the first insulating member by integral injection molding.

[0008] Preferably, a cross-sectional shape obtained by cutting the first protrusion along a plane determined along the first direction is a trapezoid, an upper base of the trapezoid is close to the connecting block, and a lower base of the trapezoid is close to the end cover body.

[0009] Preferably, a dimension of the first protrusion in the first direction is defined as a, and a dimension of the end cover body in the first direction is defined as b, wherein 0.2≤a / b≤0.75.

[0010] Preferably, there are a plurality of the first protrusions, and the plurality of the first protrusions are evenly distributed in a matrix on the side surface of the first insulating member facing the end cover body;

[0011] And / or, the first protrusion is in the shape of a truncated cone.

[0012] Preferably, the first insulating member comprises:

[0013] A fitting portion, attached to the side surface of the connecting block facing the end cover body, wherein the first protrusion is arranged on the fitting portion;

[0014] A surrounding wall portion, arranged around the peripheral side of the connecting block, and one end of the surrounding wall portion in the first direction is connected to the fitting portion;

[0015] The limiting portion is connected to the other end of the surrounding wall portion in the first direction, and a limiting space is formed among the limiting portion, the surrounding wall portion and the fitting portion, and part of the connecting block is limited in the limiting space.

[0016] Preferably, a limiting groove is provided on the outer edge of the connecting block on the side facing away from the end cover body, and the limiting portion is embedded in the limiting groove;

[0017] In the first direction, the depth of the limiting groove is greater than the size of the limiting portion, so that in the first direction, the connecting block exceeds the first insulating member by a predetermined distance.

[0018] Preferably, the predetermined distance is greater than or equal to 0.2 mm, and the predetermined distance is less than or equal to 0.5 mm;

[0019] And / or, the groove width of the limiting groove is defined as g, wherein 0.3 mm ≤ g ≤ 2 mm.

[0020] Preferably, the tensile strength of the first insulating member is defined as δ a , the tensile strength of the connecting block is δ b The dimension of the surrounding wall portion in the first direction is h, and the connection area between the first protrusion and the fitting portion is S 总 , the dimension of the limiting portion in the first direction is e, and the circumference of the outer edge of the connecting block is D;

[0021] in, 0.6*e*δa *D>1500N,S 总 *δ a >1500N,0.6*h*δ b *D>1500N .

[0022] According to the second aspect of the present application, a battery is provided, comprising the battery end cover structure described in any of the above technical solutions, and thus having all the beneficial technical effects of the battery end cover structure, which will not be described in detail herein.

[0023] Compared with the prior art, the beneficial effects of this application are:

[0024] The battery end cover structure provided in the present application is characterized in that a first protrusion is arranged on a side of the first insulating member facing the end cover body, and a first groove adapted to the first protrusion is arranged at a corresponding position on a side of the end cover body facing the connecting block. When part of the pole passes through the connecting block of the end cover body along the first direction for connection, the first protrusion is embedded in the first groove. In this way, the connection area between the end cover body and the first insulating member is effectively increased through the connection between the first protrusion and the first groove, and the connection stability between the first insulating member and the end cover body is improved. Furthermore, the deformation of the connecting block can be effectively limited through the covering effect of the first insulating member to ensure the flatness of the connecting block.

[0025] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of an exploded structure of a battery end cover structure provided in an embodiment of the present application;

[0028] Figure 2 A schematic cross-sectional view of a battery end cover structure provided in an embodiment of the present application;

[0029] Figure 3 for Figure 2 An enlarged schematic diagram of the battery end cover structure at position A is provided;

[0030] Figure 4A schematic diagram of the axonometric structure of a battery end cover structure provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the axonometric structure of the end cover body provided in an embodiment of the present application;

[0032] Figure 6 Another isometric structural schematic diagram of the end cover body provided in an embodiment of the present application.

[0033] Reference numerals:

[0034] 11-connecting block; 111-groove; 112-palladium sheet; 12-first insulating member; 121-fitting portion; 122-first protrusion; 123-surrounding wall portion; 124-limiting portion; 2-pole; 3-end cover body; 31-first groove; 32-liquid injection hole; 33-through hole; 34-second groove; 4-second insulating member; 41-second protrusion; 5-insulating gasket.

[0035] F1-first direction; F2-second direction; F3-third direction. DETAILED DESCRIPTION

[0036] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0037] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0038] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0039] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] Refer to the following Figures 1 to 6 The battery end cover structure and the battery according to some embodiments of the present application are described.

[0042] See also Figures 1 to 6 As shown, an embodiment of the first aspect of the present application provides a battery end cover structure, which includes an end cover body 3, a pole 2, a connection block 11 and a first insulating member 12. The first insulating member 12 is coated on the side of the connection block 11 facing the end cover body 3, and a first protrusion 122 is provided on the side of the first insulating member 12 facing the end cover body 3, and a first groove 31 adapted to the first protrusion 122 is provided at a corresponding position on the side of the end cover body 3 facing the connection block 11. Part of the pole 2 passes through the end cover body 3 along the first direction F1 and is connected to the connection block 11. When the pole 2 and the connection block 11 are in a connected state, the first protrusion 122 is embedded in the first groove 31.

[0043] Refer to Table 1, which shows the resistance comparison data of the connecting block 11 and the pole 2 of the existing battery end cover structure and the battery end cover structure provided by the present application with the same size specifications.

[0044] Table 1:

[0045]

[0046] According to the battery end cap structure provided by the above technical features, by setting a first protrusion 122 on the side of the first insulating member 12 facing the end cap body 3, and setting a first groove 31 adapted to the first protrusion 122 at a corresponding position on the side of the end cap body 3 facing the connection block 11, when the part of the pole 2 passes through the connection block 11 of the end cap body 3 along the first direction F1, the above-mentioned first protrusion 122 is embedded in the first groove 31, so that the connection area between the end cap body 3 and the first insulating member 12 is effectively increased through the connection effect of the first protrusion 122 and the first groove 31, and the connection stability between the first insulating member 12 and the end cap body 3 is improved, and then the deformation of the connection block 11 can be effectively limited by the coating effect of the first insulating member 12, and the flatness of the connection block 11 can be significantly improved. Then, the degree of attachment of the palladium sheet 112 to the connection block 11 is improved, and the reliability of welding is improved. As shown in Table 1, the battery end cap structure provided by the present application can significantly improve the resistance stability of the assembly structure of the connection block 11 and the pole 2.

[0047] like Figures 1 to 3 As shown, F1 shown in the figure may be an example of the first direction F1. For ease of description, two mutually perpendicular directions on a plane perpendicular to the first direction F1 are defined as a second direction F2 and a third direction F3, F2 shown in the figure may be an example of the second direction F2, and F3 shown in the figure may be an example of the third direction F3.

[0048] Preferably, the end cover body 3 and the connecting block 11 can be integrally connected by injection molding via the first insulating member 12, which not only facilitates the assembly of the end cover body 3, the connecting block 11 and the first insulating member 12, but also can further improve the connection stability between the first insulating member 12 and the end cover body 3.

[0049] Preferably, as shown in Table 2 and Figure 3 As shown, the dimension of the first protrusion 122 in the first direction F1 is defined as a, and the dimension of the end cover body 3 in the first direction F1 is defined as b, wherein 0.2≤a / b≤0.75. Thus, on the one hand, the connection stability between the first insulating member 12 and the end cover body 3 is ensured; on the other hand, the injection molding quality of the first insulating member 12 can be taken into consideration.

[0050] Table 2:

[0051]

[0052] Preferably, if Figure 2 and Figure 3As shown, the cross-sectional figure obtained by cutting the first protrusion along the plane determined by the first direction F1 is a trapezoid, the upper base of the trapezoid is close to the connecting block 11, and the lower base of the trapezoid is close to the end cover body 3. In other words, the cross-sectional area of ​​the first protrusion 122 gradually increases in the direction from one end of the first protrusion 122 close to the connecting block 11 in the first direction F1 to the other end, thereby further increasing the connection strength between the upper plastic part and the end cover body 3.

[0053] Optionally, the first protrusion 122 is in the shape of a truncated cone to facilitate the processing and forming of the first groove 31. However, it is not limited to this. As long as the cross-sectional area of ​​the first protrusion 122 gradually increases from one end of the first protrusion 122 close to the connecting block 11 in the first direction F1 to the other end, the first protrusion 122 can also be in the shape of a square truncated cone, a polygonal truncated cone or other special-shaped truncated cones.

[0054] Preferably, if Figures 1 to 3 As shown, the number of the above-mentioned first protrusions 122 can be multiple. On the one hand, multiple first protrusions 122 can effectively increase the connection points between the first insulating member 12 and the end cover body 3, so that the connection points between the first insulating member 12 and the end cover body 3 can be dispersed on the side of the first insulating member 12 facing the end cover body 3, thereby ensuring that the first protrusions 122 are subjected to dispersed forces and reducing the probability of the first protrusions 122 breaking and failing; on the other hand, the connection strength between the first insulating member 12 and the end cover body 3 is further improved, so as to further improve the straightening ability of the first insulating member 12 to the connecting block 11.

[0055] Preferably, if Figures 1 to 3 As shown, the first protrusions 122 may be evenly distributed in a matrix on the side of the first insulating member 12 facing the end cover body 3. Figure 5 As shown, the first grooves 31 may also be distributed in a matrix at corresponding positions of the end cover body 3 to further ensure that the first protrusions 122 are subjected to dispersed forces.

[0056] In an embodiment, preferably, Figures 1 to 4As shown, the first insulating member 12 may further include a fitting portion 121, a surrounding wall portion 123 and a limiting portion 124, wherein the fitting portion 121 is attached to the side of the connecting block 11 facing the end cover body 3, and the first protrusion 122 is provided on the fitting portion 121. The surrounding wall portion 123 is provided around the peripheral side of the connecting block 11, and one end of the surrounding wall portion 123 in the first direction F1 is connected to the fitting portion 121. The limiting portion 124 is connected to the other end of the surrounding wall portion 123 in the first direction F1, and a limiting space is formed among the limiting portion 124, the surrounding wall portion 123 and the fitting portion 121. Part of the connecting block 11 is limited in the limiting space. In this way, by connecting the fitting portion 121 and the limiting portion 124 through the surrounding wall, part of the connecting block 11 can be limited in the limiting space formed between the limiting portion 124 and the fitting portion 121, thereby effectively improving the connection strength between the first insulating member 12 and the connecting block 11, thereby improving the straightening ability of the first insulating member 12 to the connecting block 11.

[0057] Preferably, if Figures 1 to 3 As shown, a limiting groove 111 is provided on the outer edge of the connecting block 11 on the side facing away from the end cover body 3, and the limiting portion 124 is embedded in the limiting groove 111, so as to save the space occupied by the battery end cover structure.

[0058] Preferably, if Figure 2 and Figure 3 As shown, in the first direction F1, the depth of the limiting groove 111 is greater than the size of the limiting portion 124, so that in the first direction F1, the connecting block 11 exceeds the first insulating member 12 by a predetermined distance (ie Figure 3 f value shown), so as to facilitate welding the palladium sheet 112 on the side of the connecting block 11 facing away from the end cover body 3, it is possible to effectively avoid the first insulating member 12 being burned by the welding heat during the welding process of the palladium sheet 112.

[0059] Preferably, if Figure 3 As shown, the predetermined distance is greater than or equal to 0.2 mm, and the predetermined distance is less than or equal to 0.5 mm, in other words, 0.2 mm ≤ f ≤ 0.5 mm, so as to ensure a safe distance between the palladium sheet 112 and the first insulating member 12. Preferably, f=0.3 mm.

[0060] Preferably, if Figure 3 As shown, the width of the limiting groove 111 is defined as g, where 0.3 mm ≤ g ≤ 2, which not only facilitates machining of the connection block 11, but also prevents the limiting groove 111 from occupying too much space of the connection block 11 and affecting the performance of the connection block 11. Preferably, g = 0.5 mm.

[0061] Preferably, if Figure 3 As shown, the tensile strength of the first insulating member 12 is defined as δa , the tensile strength of the connecting block 11 is δ b The dimension of the surrounding wall portion 123 in the first direction F1 is h, and the connection area between the first protrusion 122 and the fitting portion 121 is S 总 , the dimension of the limiting portion 124 in the first direction F1 is e, and the perimeter of the outer edge of the connecting block 11 is D, wherein, 0.6*e*δ a *D＞ 1500N,S 总 *δ a ＞1500N , 0.6*h*δ b *D>1500N Specifically, when the pole 2 is riveted to the connection block 11, the connection block 11 will deform. Figure 3 Taking the position shown in the figure as an example, the deformation of the portion of the connection block 11 located on the right side of the pole 2 is particularly obvious, so the size e of the limit portion 124 on the connection block 11, the size h of the surrounding wall of the connection block 11 in the first direction, and the connection area S between the first protrusion 122 and the fitting portion 121 are 总 Resist deformation of this part; in addition, since the palladium sheet is welded to the connecting block, it is also necessary to be able to resist an upward pulling force of 1500N (the 1500N is the basic requirement for the tensile strength of the entire battery pack today), so as to ensure the straightening ability and tensile strength of the first insulating member 12 to the connecting block 11.

[0062] It should be noted that, compared with the example in which the first insulating member 12 has a plurality of first protrusions 122, the S 总 It can be understood as the sum of the connection areas of all the first protrusions 122 and the fitting portion 121 (i.e., Figure 5 As shown above S 总 =S 1 +S 2 +S 3 +…+S n ).

[0063] Taking the example that the connecting block 11 is made of aluminum and the first insulating member 12 is made of PPS plastic, optionally, δ a =105MPa,δ b =95MPa Table 3 shows an example of a battery end cover structure that satisfies the above formula (for example, e=0.5mm, h=1.5mm, D=100mm, S 总= 15mm 2 ), compared with the flatness of the connecting block 11 of the same specification traditional scheme.

[0064] Table 3:

[0065]

[0066] The data shown in Table 1 indicate that the battery end cover structure provided in the present application can significantly improve the flatness of the connection block 11 and reduce the flatness of the connection block 11 by half.

[0067] In an embodiment, preferably, Figures 1 to 3 As shown, the end cap body 3 has a through hole 33 that penetrates the end cap body 3 along the first direction F1. The pole 2 may include a pole body and a stop plate that are connected to each other, the pole body extends along the first direction F1, and the pole body penetrates the through hole 33 and is riveted to the connection block 11. The stop plate and the connection block 11 are respectively arranged at two ends of the end cap body 3 in the first direction F1 opposite to each other.

[0068] Preferably, if Figures 1 to 3 As shown, the battery end cover structure may further include an insulating gasket 5, which is sleeved on the outside of the column body and arranged between the column body and the wall of the through hole 33.

[0069] Preferably, if Figures 1 to 3 As shown, the battery end cover structure may further include a second insulating member 4, which may be disposed on a side of the end cover body 3 facing away from the connection block 11, so as to achieve insulation between the end cover body 3 and the interior of the battery. Figure 2 and Figure 3 As shown, part of the second insulating member 4 can extend between the limiting plate and the end cover body 3 , and is connected to the insulating gasket 5 to ensure the insulation integrity of both the pole 2 and the end cover body 3 .

[0070] Preferably, if Figure 2 As shown, the end cover body 3 may extend along the second direction F2. A second protrusion 41 is disposed on one side of the second insulating member 4 facing the end cover body 3, and the second protrusion 41 and the through hole 33 may be spaced apart along the second direction F2.

[0071] Correspondingly, if Figure 2 and Figure 6 As shown, a second groove 34 adapted to the second protrusion 41 may be provided at a corresponding position of the side of the end cover body 3 facing the second insulating member 4 to prevent the second insulating member 4 from rotating relative to the end cover body 3 .

[0072] Preferably, in the third direction F3 , the size of the second groove 34 may be equal to the size of the second protrusion 41 , so as to further prevent the second insulating member 4 from rotating and shaking relative to the end cover body 3 .

[0073] Optionally, in the second direction F2 , the size of the second groove 34 may be larger than the size of the second protrusion 41 to reduce the machining accuracy of both the second groove 34 and the second protrusion 41 , thereby facilitating the assembly of the insulating member and the end cover body 3 .

[0074] Preferably, if Figure 1 , Figure 2 , Figures 4 to 6 As shown, the end cap body 3 may also be provided with a liquid injection hole 32 to facilitate the injection of electrolyte into the shell. Preferably, the liquid injection hole 32 and the connecting block 11 may be spaced apart on the end cap body 3 along the second direction F2 to prevent the electrolyte from splashing and interfering with the pole 2 during the injection process.

[0075] The embodiment of the second aspect of the present application further provides a battery, comprising the battery end cover structure described in any of the above embodiments, and thus having all the beneficial technical effects of the battery end cover structure, which will not be repeated here.

[0076] Preferably, not shown in the figures, the battery may further include a shell, and the battery end cover structure may be covered on one side of the shell.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery end cover structure, characterized in that: The invention comprises an end cover body, a pole, a connection block and a first insulating member, wherein the first insulating member is covered on a side of the connection block facing the end cover body, a first protrusion is provided on a side of the first insulating member facing the end cover body, and a first groove adapted to the first protrusion is provided at a corresponding position of a side of the end cover body facing the connection block; Part of the pole passes through the end cover body along a first direction and is connected to the connection block, and when the pole and the connection block are in a connected state, the first protrusion is embedded in the first groove; The end cover body and the connection block are integrally connected by injection molding via the first insulating member; A cross-sectional shape obtained by cutting the first protrusion along a plane determined along the first direction is a trapezoid, an upper base of the trapezoid is close to the connecting block, and a lower base of the trapezoid is close to the end cover body; The first insulating member comprises: A fitting portion, attached to the side surface of the connecting block facing the end cover body, wherein the first protrusion is arranged on the fitting portion; A surrounding wall portion, arranged around the peripheral side of the connecting block, and one end of the surrounding wall portion in the first direction is connected to the fitting portion; a limiting portion connected to the other end of the surrounding wall portion in the first direction, wherein a limiting space is formed among the limiting portion, the surrounding wall portion and the fitting portion, and a portion of the connecting block is limited in the limiting space; The tensile strength of the first insulating member is defined as δ a , the tensile strength of the connecting block is δ b The dimension of the surrounding wall portion in the first direction is h, and the connection area between the first protrusion and the fitting portion is S 总 , the size of the limiting portion in the first direction is e, and the circumference of the outer edge of the connecting block is D; in, 0.6*e*δ a *D>1500N,S 总 *δ a >1500N,0.6*h*δ b *D>1500N .

2. The battery end cover structure according to claim 1, characterized in that: The dimension of the first protrusion in the first direction is defined as a, and the dimension of the end cover body in the first direction is defined as b, wherein 0.2≤a / b≤0.

75.

3. The battery end cover structure according to claim 1, characterized in that: The number of the first protrusions is multiple, and the multiple first protrusions are evenly distributed in a matrix on the side of the first insulating member facing the end cover body; And / or, the first protrusion is in the shape of a truncated cone.

4. The battery end cover structure according to claim 1, characterized in that: A limiting groove is provided on the outer edge of the connecting block on a side facing away from the end cover body, and the limiting portion is embedded in the limiting groove; In the first direction, the depth of the limiting groove is greater than the size of the limiting portion, so that in the first direction, the connecting block exceeds the first insulating member by a predetermined distance.

5. The battery end cover structure according to claim 4, characterized in that: The predetermined distance is greater than or equal to 0.2 mm, and the predetermined distance is less than or equal to 0.5 mm; And / or, the groove width of the limiting groove is defined as g, wherein 0.3 mm ≤ g ≤ 2 mm.

6. A battery, characterized in that: A battery end cover structure comprising any one of claims 1 to 5.

Images