Top cover assembly and battery

Abstract

The utility model provides a top cover assembly and a battery. The top cover assembly comprises a cover plate and a pole, the cover plate is provided with a first surface and a second surface which are opposite, a first through hole is formed in the cover plate and penetrates from the first surface to the second surface, the pole penetrates through the first through hole and is in insulation connection with the cover plate, and the pole comprises a first connecting part penetrating through the first through hole. The orthographic projection of the first connecting part on the second surface in the direction facing the first surface forms a first contour, the first contour extends in the first direction, the first contour has a first maximum length L1 in the first direction and a first maximum width L2 in the second direction, and the first direction is perpendicular to the second direction. According to the invention, the ratio of the first maximum length to the first maximum width is set to be greater than or equal to 2 and less than or equal to 3, so that the post terminal has relatively good torsion resistance, and the condition that the tensile property of the post terminal is reduced due to an overlarge ratio can be avoided, thereby being beneficial to improving the overall mechanical property of the top cover assembly.

Description

Technical Field

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

[0002] The battery generally includes a cell, a shell and a top cover assembly. The top cover assembly is sealed on the shell to form a protective shell with the shell, and the cell is contained in the protective shell. The top cover assembly is usually provided with conductive poles for the positive and negative electrodes to lead the positive and negative electrodes of the cell out of the protective shell respectively. In the related art, the pole usually adopts a cylindrical structure to simplify the production and installation process of the pole, but this structure will result in poor torsional performance of the pole, thereby affecting the overall mechanical properties of the top cover assembly. Utility Model Content

[0003] The embodiments of the present application provide a top cover assembly and a battery, which can improve the technical problem of poor overall mechanical properties of the top cover assembly.

[0004] In a first aspect, an embodiment of the present application provides a top cover assembly, comprising:

[0005] A cover plate having a first surface and a second surface opposite to each other, wherein a first through hole is formed on the cover plate, and the first through hole penetrates from the first surface to the second surface;

[0006] A pole, wherein the pole passes through the first through hole and is insulated and connected to the cover plate, the pole includes a first connecting portion passing through the first through hole, the first connecting portion is projected on the second surface toward the first surface to form a first contour, the first contour extends along a first direction, the first contour has a first maximum length in the first direction, the first maximum length is L1, the first contour has a first maximum width in the second direction, the first maximum width is L2, and the ratio of the first maximum length to the first maximum width satisfies the relationship: 2≤L1 / L2≤3; the first direction is perpendicular to the second direction.

[0007] In one embodiment, the pole also includes a second connecting portion located outside the first through hole, the second connecting portion is electrically connected to the first connecting portion, the orthographic projection of the second connecting portion in the direction from the second surface toward the first surface covers the orthographic projection of the first connecting portion in the direction from the second surface toward the first surface, and the orthographic projection of the second connecting portion in the direction from the second surface toward the first surface forms a second contour.

[0008] In one embodiment, the second contour extends along the first direction, the second contour has a second maximum length in the first direction, the second maximum length is L3, the second contour has a second maximum width in the second direction, the second maximum width is L4, and the ratio of the second maximum length to the second maximum width satisfies the relationship: 2≤L3 / L4≤3.

[0009] In one embodiment, a ratio of the first maximum length to the first maximum width and a ratio of the second maximum length to the second maximum width are equal.

[0010] In one embodiment, the spacing between two opposite sides of the first contour in the first direction and the corresponding second contour is equal; and / or the spacing between two opposite sides of the first contour in the second direction and the corresponding second contour is equal.

[0011] In one embodiment, the top cover assembly includes a first insulating member, which is located on the second surface of the cover plate. A second through hole is opened on the first insulating member at a position corresponding to the first through hole. The pole passes through the second through hole and the first through hole, and is insulated and connected to the cover plate through the first insulating member; the second through hole forms a first opening on a side of the first insulating member facing the cover plate, and the second through hole forms a second opening on a side of the first insulating member away from the cover plate, and the opening area of ​​the first opening is larger than the opening area of ​​the second opening.

[0012] In one embodiment, in the direction from the second opening toward the first opening, at least a portion of the sidewall of the second through hole is inclined in a direction away from the axis of the second through hole to form an inclined surface; an angle between the inclined surface and the axis of the second through hole is greater than or equal to 45°; or,

[0013] In a direction from the second opening toward the first opening, at least a portion of the sidewall of the second through hole is bent in a direction away from the axis of the second through hole to form a curved surface.

[0014] In one embodiment, the top cover assembly also includes a second insulating member and a connecting terminal, and the second insulating member and the connecting terminal are arranged in sequence along a direction away from the first surface; a third through hole is opened on the second insulating member at a position corresponding to the first through hole, and the pole passes through the first through hole and the third through hole and is electrically connected to the connecting terminal; a groove is opened on the side of the second insulating member facing the connecting terminal, and the groove is connected to the third through hole.

[0015] In one embodiment, a mounting groove is formed on the first surface, the second insulating member is at least partially located in the mounting groove, a notch is formed on a side of the second insulating member facing the cover plate, and a side wall of the notch at least partially abuts against a side wall of the mounting groove.

[0016] In a second aspect, an embodiment of the present application provides a battery, the battery comprising:

[0017] A housing is formed with a receiving cavity;

[0018] The top cover assembly described in any one of the above items, wherein the cover plate of the top cover assembly is connected to the housing;

[0019] The battery cell is located in the accommodating cavity, and the battery cell is electrically connected to the pole in the top cover assembly.

[0020] Beneficial effects of the embodiments of the present application:

[0021] In an embodiment of the present application, a top cover assembly includes a cover plate and a pole, the cover plate having a first surface and a second surface relative to each other, a first through hole being provided on the cover plate, the first through hole extending from the first surface to the second surface, the pole passing through the first through hole and being insulated and connected to the cover plate, the pole including a first connecting portion passing through the first through hole, the first connecting portion being projected in a direction from the second surface toward the first surface to form a first contour, the first contour extending along a first direction, the first contour having a first maximum length in the first direction, the first maximum length being L1, the first contour having a first maximum width in the second direction, the first maximum width being L2, and the first direction being perpendicular to the second direction, the present application sets the ratio of the first maximum length to the first maximum width to 2≤L1 / L2≤3, so that the pole has better torsional resistance while avoiding the reduction of the tensile resistance of the pole due to the excessively large ratio, thereby helping to improve the overall mechanical properties of the top cover assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 is a schematic diagram of a three-dimensional structure of a top cover assembly provided in an embodiment of the present application;

[0024] Figure 2 is a schematic diagram of an assembly structure of a top cover assembly provided in an embodiment of the present application;

[0025] Figure 3is a schematic cross-sectional structural diagram of a top cover assembly provided in an embodiment of the present application;

[0026] Figure 4 This is a method provided by the embodiments of the present application. Figure 3 Schematic diagram of the enlarged structure of the A area in the middle;

[0027] Figure 5 is a schematic diagram of a top view of a pole provided in an embodiment of the present application;

[0028] Figure 6 is a schematic diagram of a three-dimensional structure of a second insulating member provided in an embodiment of the present application;

[0029] Figure 7 It is a schematic diagram of the structure of a battery provided in an embodiment of the present application.

[0030] Description of reference numerals:

[0031] 10. Battery;

[0032] 100, top cover assembly; 110, cover plate; 111, first surface; 112, second surface; 113, first through hole; 114, mounting groove; 120, pole; 121, first connecting portion; 122, second connecting portion; 130, first insulating member; 131, second through hole; 132, first opening; 133, second opening; 134, inclined surface; 140, second insulating member; 141, third through hole; 142, groove; 143, notch; 150, connecting terminal; 160, sealing member; 170, connecting member; X, first direction; Y, second direction;

[0033] 200, housing; 210, accommodating chamber;

[0034] 300, battery cells. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0036] First, the present application embodiment provides a top cover assembly, such as Figures 1 to 3 As shown, the top cover assembly 100 includes a cover plate 110, the cover plate 110 has a first surface 111 and a second surface 112 opposite to each other, and a first through hole 113 is opened on the cover plate 110, and the first through hole 113 passes through the first surface 111 to the second surface 112. That is, the first through hole 113 passes through the cover plate 110 along the thickness direction of the cover plate 110, so that when the cover plate 110 is assembled into the battery 10, the battery cell 300 located inside the battery 10 is electrically connected to the external circuit through the cover plate 110.

[0037] The top cover assembly 100 includes a pole 120, which passes through the first through hole 113 and is insulated from the cover plate 110. The pole 120 is used to electrically connect to the battery cell 300 in the battery 10 to achieve the connection between the battery cell 300 and the external circuit. The pole 120 includes a first connecting portion 121 that passes through the first through hole 113. The first connecting portion 121 forms a first contour by an orthographic projection in the direction from the second surface 112 to the first surface 111, that is, the first connecting portion 121 is the portion of the pole 120 that passes through the first through hole 113 on the cover plate 110, and the first connecting portion 121 is insulated from the side wall of the first through hole 113 to achieve the insulated connection between the pole 120 and the cover plate 110. The first contour is the area formed by the orthographic projection of the first connecting portion 121 in the thickness direction of the cover plate 110.

[0038] Among them, Figure 5 As shown, the first profile extends along the first direction X, the first profile has a first maximum length in the first direction X, the first maximum length is L1, the first profile has a first maximum width in the second direction Y, the first maximum width is L2, the ratio of the first maximum length to the first maximum width satisfies the relationship: 2≤L1 / L2≤3, and the first direction X is perpendicular to the second direction Y.

[0039] It should be noted that the first direction X refers to the direction of the line connecting the two points farthest from each other on the first contour, that is, the first contour as a whole can be regarded as extending along the first direction X, and the length of the line corresponding to the two points is the first maximum length of the first contour in the first direction X. Correspondingly, the second direction Y perpendicular to the first direction X is defined as the width direction of the first contour, and the maximum value of the width of the first contour in the second direction Y is the first maximum width.

[0040] Among them, the ratio of the first maximum length L1 to the first maximum width L2 is directly related to the shape of the first profile. For example, when the first profile is circular, the first maximum length is equal to the first maximum width. If the ratio of the first maximum length L1 to the first maximum width L2 is smaller, it means that the first profile is closer to a circle and the pole 120 is closer to a cylinder, which will result in poor torsional performance of the pole 120; if the ratio of the first maximum length L1 to the first maximum width L2 is larger, the first profile is closer to a rectangle and the pole 120 is closer to a strip, which will result in poor tensile performance of the pole 120. The present application sets the ratio of the first maximum length L1 to the first maximum width L2 to 2≤L1 / L2≤3, so that the pole 120 has good torsional performance while meeting the tensile performance requirements, thereby improving the overall mechanical properties of the top cover assembly 100.

[0041] It should be noted that, since the first connecting portion 121 is passed through the first through hole 113, in order to ensure the connection stability between the pole 120 and the cover plate 110, the shape of the first through hole 113 is adapted to the shape of the first connecting portion 121, that is, the contour shape formed by the orthographic projection of the first through hole 113 in the direction of the second surface 112 toward the first surface 111 is consistent with the shape of the first contour, and the contour area corresponding to the first through hole 113 is slightly larger than the area formed by the first contour, so as to ensure the smooth assembly of the pole 120 and the cover plate 110.

[0042] The pole 120 can be in a regular shape such as an elliptical column or a waist shape, or other irregular shapes. It only needs to ensure that the pole 120 has good torsional and tensile properties, and no special restrictions are made here.

[0043] In the embodiment of the present application, the top cover assembly 100 includes a cover plate 110 and a pole 120. The cover plate 110 has a first surface 111 and a second surface 112 opposite to each other. A first through hole 113 is provided on the cover plate 110. The first through hole 113 runs from the first surface 111 to the second surface 112. The pole 120 passes through the first through hole 113 and is insulated and connected to the cover plate 110. The pole 120 includes a first connecting portion 121 passing through the first through hole 113. The first connecting portion 121 is projected in a direction from the second surface 112 toward the first surface 111 to form a first contour. The first contour extends along a first direction X. The first contour has a first maximum length in the first direction X, and the first maximum length is L. 1. The first profile has a first maximum width in the second direction Y, the first maximum width is L2, and the first direction X is perpendicular to the second direction Y. The present application sets the ratio of the first maximum length to the first maximum width to 2≤L1 / L2≤3, so that the pole 120 has good torsional resistance while avoiding the reduction of the tensile resistance of the pole 120 due to the ratio being too large, thereby helping to improve the overall mechanical properties of the top cover assembly 100; in addition, by setting the ratio of the first maximum length to the first maximum width to 2≤L1 / L2≤3, it is also helpful to improve the welding effect between the pole 120 and an external circuit such as a bar or a busbar, so as to achieve connectivity between the pole 120 and the external circuit.

[0044] Optional, such as Figure 1 and Figure 3 As shown, the pole 120 further includes a second connection portion 122 located outside the first through hole 113, the second connection portion 122 is electrically connected to the first connection portion 121, the orthographic projection of the second connection portion 122 in the direction from the second surface 112 to the first surface 111 covers the orthographic projection of the first connection portion 121 in the direction from the second surface 112 to the first surface 111, and the orthographic projection of the second connection portion 122 in the direction from the second surface 112 to the first surface 111 forms a second contour. That is, the second contour surrounds the outside of the first contour, and the cross-sectional area of ​​the second connection portion 122 is greater than the cross-sectional area of ​​the first connection portion 121, so that when the pole 120 is assembled with the cover plate 110, the second connection portion 122 will not penetrate into the first through hole 113, thereby playing a certain positioning role in the installation position of the pole 120; in addition, setting the cross-sectional area of ​​the second connection portion 122 to be greater than the cross-sectional area of ​​the first connection portion 121 also helps to increase the effective connection area of ​​the pole 120, thereby facilitating the electrical connection design between the pole 120 and the battery cell 300 in the battery 10.

[0045] Among them, Figure 5As shown, the second profile extends along the first direction X, that is, the extension trend of the second profile is consistent with the extension trend of the first profile. The second profile has a second maximum length in the first direction X, the second maximum length is L3, the second profile has a second maximum width in the second direction Y, the second maximum width is L4, and the ratio of the second maximum length to the second maximum width satisfies the relationship: 2≤L3 / L4≤3, that is, the second connecting portion 122 and the first connecting portion 121 are structures of the same shape type, so as to facilitate the integrated structural design of the first connecting portion 121 and the second connecting portion 122.

[0046] It should be noted that the top cover assembly 100 includes a connector 170, which is used to be electrically connected to the second connection portion 122, and the connector 170 is used to be electrically connected to the battery cell 300 in the battery 10. Among them, the connector 170 is provided with a through hole adapted to the second connection portion 122, and the second connection portion 122 passes through the through hole on the connector 170 and is electrically connected to the connector 170. By setting the ratio of the second maximum length L3 to the second maximum width L4 to 2≤L3 / L4≤3, it is possible to ensure that the second connection portion 122 has good torsional resistance while meeting the tensile performance requirements, thereby further improving the overall mechanical properties of the top cover assembly 100; in addition, by setting the ratio of the second maximum length L3 to the second maximum width L4 to 2≤L3 / L4≤3, it is also helpful to improve the welding effect of the pole 120 and the connector 170 and the battery cell 300 in the battery 10, so as to achieve the connection between the pole 120 and the internal circuit.

[0047] In some embodiments, the ratio of the first maximum length to the first maximum width and the ratio of the second maximum length to the second maximum width are equal, that is, the first contour and the second contour are arranged concentrically in equal proportion, that is, the first connection part 121 and the second connection part 122 are arranged concentrically in equal proportion, so as to facilitate the integrated design of the first connection part 121 and the second connection part 122; in addition, when the first connection part 121 and the second connection part 122 are electrically connected and designed respectively, it also helps to improve the uniformity of force between the first connection part 121 and the second connection part 122, thereby improving the overall mechanical properties of the top cover assembly 100.

[0048] In other embodiments, the spacing between the opposite sides of the first contour in the first direction X and the corresponding second contour is equal, that is, in the first direction X, the width of the portion of the second connection portion 122 protruding from the side of the first connection portion 121 is equal everywhere, that is, in the first direction X, the first connection portion 121 and the second connection portion 122 are concentrically arranged, and the first connection portion 121 is located in the central area of ​​the second connection portion 122, which helps to improve the aesthetics of the pole 120 and also helps to assemble the pole 120 with the cover plate 110.

[0049] In some other embodiments, the spacing between the opposite sides of the first contour in the second direction Y and the corresponding second contour is equal, that is, in the second direction Y, the width of the portion of the second connection portion 122 protruding from the side of the first connection portion 121 is equal everywhere, that is, in the second direction Y, the first connection portion 121 and the second connection portion 122 are concentrically arranged, and the first connection portion 121 is located in the central area of ​​the second connection portion 122, which helps to further improve the aesthetics of the pole 120 and also helps to assemble the pole 120 with the cover plate 110.

[0050] Optional, such as Figures 1 to 3 As shown, the top cover assembly 100 includes a first insulating member 130, the first insulating member 130 is located on the second surface 112 of the cover plate 110, a second through hole 131 is opened at a position corresponding to the first through hole 113 on the first insulating member 130, and the pole 120 passes through the second through hole 131 and the first through hole 113, and is insulated and connected to the cover plate 110 through the first insulating member 130. That is, the first insulating member 130 is used to separate the pole 120 from the cover plate 110 to avoid a short circuit between the pole 120 and the cover plate 110. Similarly, the second through hole 131 on the first insulating member 130 is adapted to the pole 120, that is, the contour of the second through hole 131 is consistent with the contour of the pole 120.

[0051] Among them, Figure 4 As shown, the second through hole 131 forms a first opening 132 on the side of the first insulating member 130 facing the cover plate 110, and forms a second opening 133 on the side of the first insulating member 130 facing away from the cover plate 110, and the opening area of ​​the first opening 132 is greater than the opening area of ​​the second opening 133. That is, the second through hole 131 is a non-uniform hole, and the side wall of the second through hole 131 does not extend in a direction parallel to the axis of the second through hole 131. This arrangement increases the effective length of the side wall of the second through hole 131 relative to the side wall of the vertical through hole. When creepage occurs on the first insulating member 130 during use of the top cover assembly 100, the creepage distance along the side wall of the second through hole 131 can be increased, thereby helping to improve the electrical performance of the top cover assembly 100.

[0052] It should be noted that the top cover assembly 100 further includes a seal 160, which is sleeved on the pole 120 to achieve sealing insulation between the pole 120 and the cover plate 110. When the top cover assembly 100 is assembled, the seal 160 is sleeved on the pole 120, and then the pole 120 is passed through the second through hole 131 and the first through hole 113 in sequence, and the seal 160 is simultaneously abutted against the pole 120, the cover plate 110 and the side wall of the second through hole 131 under the action of the extrusion force, thereby achieving sealing insulation between the pole 120 and the cover plate 110.

[0053] In some embodiments, in the direction from the second opening 133 to the first opening 132, at least part of the sidewall of the second through hole 131 is inclined in the direction away from the axis of the second through hole 131 to form an inclined surface 134, that is, in the direction from the second opening 133 to the first opening 132, at least part of the sidewall of the second through hole 131 is expanding, so as to increase the effective length of the sidewall of the second through hole 131, thereby increasing the creepage distance during the use of the top cover assembly 100 and improving the electrical performance of the top cover assembly 100. Among them, the angle between the inclined surface 134 and the axis of the second through hole 131 is greater than or equal to 45°, that is, the expansion angle of the inclined surface 134 is greater than or equal to 45°, so as to ensure that the creepage distance during the use of the top cover assembly 100 can be effectively increased.

[0054] In other embodiments, in the direction from the second opening 133 to the first opening 132, at least a portion of the side walls of the second through hole 131 are bent in a direction away from the axis of the second through hole 131 to form a curved surface, that is, in the direction from the second opening 133 to the first opening 132, at least a portion of the side walls of the second through hole 131 are similar to a chamfered corner design. This method can also make at least a portion of the side walls of the second through hole 131 tend to expand, so as to increase the effective length of the side walls of the second through hole 131, thereby increasing the creepage distance of the top cover assembly 100 during use and improving the electrical performance of the top cover assembly 100.

[0055] In some other embodiments, a limiting portion is protruded from the side of the first insulating member 130 facing the cover plate 110, and a limiting groove is provided on the side of the cover plate 110 facing the first insulating member 130. The limiting portion is used to be inserted into the limiting groove to achieve the positioning and assembly of the first insulating member 130 and the cover plate 110; at the same time, the mutual cooperation between the limiting portion and the limiting groove can also improve the torsion resistance between the first insulating member 130 and the cover plate 110, thereby further improving the overall mechanical properties of the top cover assembly 100.

[0056] Optional, such as Figure 1 and Figure 3 As shown, the top cover assembly 100 further includes a second insulating member 140 and a connecting terminal 150, which are sequentially arranged in a direction away from the first surface 111; a third through hole 141 is provided on the second insulating member 140 at a position corresponding to the first through hole 113, and the pole 120 passes through the first through hole 113 and the third through hole 141 and is electrically connected to the connecting terminal 150. That is, the connecting terminal 150 is used to electrically connect to an external circuit to achieve electrical connection between the battery cell 300 in the battery 10 and the external circuit, and the second insulating member 140 is used to separate the connecting terminal 150 from the cover plate 110 to avoid short circuit between the connecting terminal 150 and the cover plate 110, thereby achieving an insulated connection between the pole 120 and the cover plate 110.

[0057] Among them, Figure 6 As shown, a groove 142 is provided on the side of the second insulating member 140 facing the connecting terminal 150, and the groove 142 is connected to the third through hole 141. By providing the groove 142 on the second insulating member 140, when the connecting terminal 150 and the pole 120 are welded, the gas and smoke generated during the welding process can be discharged in time along the groove 142, thereby helping to improve the welding effect between the connecting terminal 150 and the pole 120, and further improving the overall electrical performance of the top cover assembly 100.

[0058] It should be noted that the shape of the groove 142 in the embodiment of the present application can be a straight line, a cross, or a cross, etc., and its specific shape can be selected and adjusted according to actual design requirements, and there is no special limitation here.

[0059] Among them, the side of the connecting terminal 150 facing the second insulating member 140 and the side away from the second insulating member 140 can adopt the same design, that is, the connecting terminal 150 has no distinction between the front and back sides, so that the connecting terminal 150 has an anti-mistake effect, and there is no need to distinguish between the front and back sides during the production and assembly process of the top cover assembly 100, which helps to improve the production and assembly efficiency of the top cover assembly 100.

[0060] In some embodiments, Figure 1 and Figure 6 As shown, a mounting groove 114 is provided on the first surface 111, and the second insulating member 140 is at least partially located in the mounting groove 114. A notch 143 is formed on the side of the second insulating member 140 facing the cover plate 110, and the side wall of the notch 143 at least partially abuts against the side wall of the mounting groove 114. That is, the notch 143 on the second insulating member 140 and the corresponding position of the mounting groove 114 on the first surface 111 of the cover plate 110 form a foolproof structure, so as to facilitate the rapid assembly of the second insulating member 140 and the cover plate 110, thereby improving the overall assembly efficiency of the top cover assembly 100.

[0061] The notch 143 on the second insulating member 140 can be disposed at one of the corners or two corners in the diagonally opposite direction of the second insulating member 140, and the mounting groove 114 on the first surface 111 of the cover plate 110 is chamfered accordingly. The contour shape of the notch 143 can be a triangle or other regular or irregular shapes, and the corresponding position of the mounting groove 114 is adapted and designed, and there is no special limitation here.

[0062] Secondly, an embodiment of the present application provides a battery, which includes a top cover assembly. The specific structure of the top cover assembly refers to the above-mentioned embodiment. Since the battery adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0063] like Figure 7 As shown, the battery 10 includes an outer shell 200, a top cover assembly 100 and a battery cell 300. The outer shell 200 is formed with a accommodating cavity 210. The cover plate 110 of the top cover assembly 100 is connected to the outer shell 200. The battery cell 300 is located in the accommodating cavity 210, and the battery cell 300 is electrically connected to the pole 120 in the top cover assembly 100 to facilitate the electrical connection design between the battery cell 300 and the external circuit.

[0064] The battery cell 300 includes a first electrode and a second electrode, and two poles 120 can be simultaneously arranged on the cover plate 110 of the top cover assembly 100, and the first electrode and the second electrode of the battery cell 300 are respectively electrically connected to the two poles 120; or, the two ends of the housing 200 are respectively connected to a top cover assembly 100, each top cover assembly 100 includes a pole 120, and the first electrode and the second electrode of the battery cell 300 are respectively electrically connected to the poles 120 in the two top cover assemblies 100. The specific connection method between the battery cell 300 and the top cover assembly 100 can be selected and adjusted according to actual design requirements, and is not particularly limited here.

[0065] Specifically, Figure 1 , Figure 2 and Figure 5 As shown, in the embodiment of the present application, the top cover assembly 100 includes a cover plate 110 and a pole 120, the cover plate 110 has a first surface 111 and a second surface 112 opposite to each other, a first through hole 113 is opened on the cover plate 110, the first through hole 113 runs from the first surface 111 to the second surface 112, the pole 120 passes through the first through hole 113 and is insulated and connected to the cover plate 110, the pole 120 includes a first connecting portion 121 passing through the first through hole 113, and the first connecting portion 121 is projected on the second surface 112 toward the first surface 111 to form a first contour The first profile extends along a first direction X, and the first profile has a first maximum length in the first direction X, and the first maximum length is L1. The first profile has a first maximum width in the second direction Y, and the first maximum width is L2. The first direction X is perpendicular to the second direction Y. In the present application, by setting the ratio of the first maximum length to the first maximum width to 2≤L1 / L2≤3, the pole 120 has better torsional resistance, while avoiding the reduction of the tensile resistance of the pole 120 due to the excessively large ratio, thereby helping to improve the overall mechanical properties of the top cover assembly 100.

[0066] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A top cover assembly, characterized in that: include: A cover plate having a first surface and a second surface opposite to each other, wherein a first through hole is formed on the cover plate, and the first through hole penetrates from the first surface to the second surface; A pole, wherein the pole passes through the first through hole and is insulated and connected to the cover plate, the pole includes a first connecting portion passing through the first through hole, the first connecting portion is projected on the second surface toward the first surface to form a first contour, the first contour extends along a first direction, the first contour has a first maximum length in the first direction, the first maximum length is L1, the first contour has a first maximum width in the second direction, the first maximum width is L2, and the ratio of the first maximum length to the first maximum width satisfies the relationship: 2≤L1 / L2≤3; the first direction is perpendicular to the second direction.

2. The top cover assembly according to claim 1, characterized in that: The pole also includes a second connecting portion located outside the first through hole, the second connecting portion is electrically connected to the first connecting portion, the orthographic projection of the second connecting portion in the direction of the second surface toward the first surface covers the orthographic projection of the first connecting portion in the direction of the second surface toward the first surface, and the orthographic projection of the second connecting portion in the direction of the second surface toward the first surface forms a second contour.

3. The top cover assembly according to claim 2, characterized in that: The second contour extends along the first direction, and the second contour has a second maximum length in the first direction, and the second maximum length is L3. The second contour has a second maximum width in the second direction, and the second maximum width is L4. The ratio of the second maximum length to the second maximum width satisfies the relationship: 2≤L3 / L4≤3.

4. The top cover assembly according to claim 3, characterized in that: A ratio of the first maximum length to the first maximum width is equal to a ratio of the second maximum length to the second maximum width.

5. The top cover assembly according to claim 2, characterized in that: The distances between two opposite sides of the first contour in the first direction and the corresponding second contour are equal; and / or the distances between two opposite sides of the first contour in the second direction and the corresponding second contour are equal.

6. The top cover assembly according to any one of claims 1 to 5, characterized in that: The top cover assembly includes a first insulating member, which is located on the second surface of the cover plate. A second through hole is opened on the first insulating member at a position corresponding to the first through hole. The pole passes through the second through hole and the first through hole, and is insulated and connected to the cover plate through the first insulating member; the second through hole forms a first opening on a side of the first insulating member facing the cover plate, and the second through hole forms a second opening on a side of the first insulating member away from the cover plate, and the opening area of ​​the first opening is larger than the opening area of ​​the second opening.

7. The top cover assembly according to claim 6, characterized in that: In the direction from the second opening to the first opening, at least part of the sidewall of the second through hole is inclined in a direction away from the axis of the second through hole to form an inclined surface; the angle between the inclined surface and the axis of the second through hole is greater than or equal to 45°; or, In a direction from the second opening toward the first opening, at least a portion of the sidewall of the second through hole is bent in a direction away from the axis of the second through hole to form a curved surface.

8. The top cover assembly according to any one of claims 1 to 5, characterized in that: The top cover assembly also includes a second insulating member and a connecting terminal, which are arranged in sequence in a direction away from the first surface; a third through hole is provided on the second insulating member at a position corresponding to the first through hole, and the pole passes through the first through hole and the third through hole and is electrically connected to the connecting terminal; a groove is provided on the side of the second insulating member facing the connecting terminal, and the groove is connected to the third through hole.

9. The top cover assembly according to claim 8, characterized in that: The first surface is provided with a mounting groove, the second insulating member is at least partially located in the mounting groove, a notch is formed on a side of the second insulating member facing the cover plate, and a side wall of the notch at least partially abuts against a side wall of the mounting groove.

10. A battery, characterized in that: The battery comprises: A housing is formed with a receiving cavity; The top cover assembly according to any one of claims 1 to 9, wherein the cover plate of the top cover assembly is connected to the outer shell; The battery cell is located in the accommodating cavity, and the battery cell is electrically connected to the pole in the top cover assembly.

Images