Battery cover plate and battery monomer

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cover plate and a single battery, the battery cover plate comprises a cover plate body, an insulating part and a pole, the insulating part is arranged on the surface of one side of the cover plate body, a protruding structure is arranged on the side, away from the cover plate body, of the insulating part, and the pole comprises a column body and a first support which are connected with each other; the column body penetrates through the insulating part and the cover plate body, and the first support and one side, deviating from the cover plate body, of the insulating part are arranged at an interval and are propped against the convex structure, so that the effect of reducing the size and the weight of the pole column is achieved, the weight of the battery cover plate is reduced, and the energy density of a single battery is favorably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cover and a battery cell. Background Art

[0002] The battery cover is a key component of the battery cell. Figures 1 to 3 As shown, the battery cover generally includes a cover body 100', a lower plastic 200' and a pole 300', wherein the cover body 100' is covered at the opening of the battery shell and welded with the battery shell to form a sealed cavity, the lower plastic 200' covers the side of the cover body 100' facing the battery shell, and the pole 300' is penetrated by the cover body 100' and the lower plastic 200'.

[0003] At present, the battery cell of the blade battery cell needs to be hot-melted with the side 210' of the lower plastic 200', and the hot-melt height h required for the side 210' is approximately more than 3 mm. At the same time, in order to prevent the pole ear from being cut by the side 210', it is necessary to lengthen the length of the pole 300' so that the side of the pole 300' facing the battery cell is flush with the side of the side 210' facing the battery cell, thereby increasing the weight of the pole 300', which increases the weight of the battery cover, and is not conducive to improving the energy density of the battery cell.

[0004] Therefore, it is urgent to provide a battery cover and a battery cell to solve the above technical problems. Summary of the invention

[0005] The first object of the present invention is to provide a battery cover plate, which can reduce the volume and weight of the pole, thereby reducing the weight of the battery cover plate, which is beneficial to improving the energy density of the battery cell.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Battery cover, including:

[0008] Cover plate body;

[0009] An insulating member, the insulating member is arranged on one side surface of the cover body, and a protruding structure is arranged on the side of the insulating member away from the cover body;

[0010] The pole comprises a column and a first support, the column is connected to the first support, the column is penetrated by the insulating member and the cover body, the first support is spaced apart from the side of the insulating member away from the cover body and abuts against the protruding structure.

[0011] Optionally, the protruding structures are evenly distributed within the orthographic projection of the first support on the insulating member.

[0012] Optionally, the protrusion structure includes an even number of first protrusions and an even number of second protrusions, the even number of first protrusions are symmetrically arranged about the axis of the column in the first direction, and the even number of second protrusions are symmetrically arranged about the axis of the column in the second direction, and the first direction is perpendicular to the second direction.

[0013] Optionally, the first protrusion is connected to an adjacent second protrusion.

[0014] Optionally, the height of the first support is e, 0.5mm≤e≤2.0mm.

[0015] Optionally, the battery cover further includes a sealing ring, and the pole is sealed and connected to the cover body via the sealing ring.

[0016] Optionally, the pole also includes a second support, the column is connected to the first support through the second support, the second support is located on the side of the cover body where the insulating member is provided, the sealing ring includes a first sealing section, the first sealing section is sleeved on the column, the first sealing section is clamped between the second support and the cover body, and / or the first sealing section is clamped between the second support and the insulating member.

[0017] Optionally, the sealing ring further includes a second sealing section, which is sleeved on the column and connected to the first sealing section. The cover body is provided with a first pole hole, and the second sealing section is clamped between the side wall of the column and the hole wall of the first pole hole.

[0018] Optionally, the height of the second support is f, the height of the protruding structure protruding from the surface of the insulating member is g, and f is equal to g.

[0019] A second object of the present invention is to provide a battery cell having a higher energy density.

[0020] To achieve this object, the present invention adopts the following technical solutions:

[0021] The battery cell comprises a shell, an electrode group and the above-mentioned battery cover plate, wherein the electrode group is arranged in the shell, and the cover plate body is arranged to cover the opening of the shell.

[0022] Beneficial effects of the present invention:

[0023] The battery cover provided by the present invention has a protruding structure on the side of the insulating member facing away from the cover body, and the pole includes a column and a first support that are connected to each other, the column is penetrated by the insulating member and the cover body, the first support is spaced apart from the side of the insulating member facing away from the battery cover, and the first support abuts against the protruding structure. The design of the protruding structure leaves a gap between the first support and the side of the insulating member facing away from the cover body, thereby achieving the effect of reducing the volume and weight of the pole, reducing the weight of the battery cover, and facilitating improving the energy density of the battery cell.

[0024] The battery cell provided by the present invention adopts the above-mentioned battery cover plate, and since the battery cover plate is light in weight, the energy density of the battery cell is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a battery cover in the prior art;

[0026] Figure 2 yes Figure 1 Schematic diagram of the cross-section structure in the AA direction;

[0027] Figure 3 yes Figure 1 Schematic diagram of the cross-section structure in the middle BB direction;

[0028] Figure 4 is a partial cross-sectional enlarged structural schematic diagram of a battery cover provided by an embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of the cross-sectional structure of a pole provided by an embodiment of the present invention;

[0030] Figure 6 is a schematic structural diagram of an insulating member provided by an embodiment of the present invention;

[0031] Figure 7 yes Figure 6 Schematic diagram of the cross-sectional structure in the CC direction.

[0032] In the figure:

[0033] 100', cover body; 200', lower plastic; 210', side; 300', pole;

[0034] 100, cover body; 200, insulating member; 210, protruding structure; 211, first protruding portion; 212, second protruding portion; 220, second pole hole; 230, limiting groove; 300, pole; 310, column; 320, first support; 330, second support; 400, sealing ring; 410, first sealing section; 420, second sealing section; 500, gap. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] This embodiment provides a battery cover plate, which can reduce the volume and weight of the pole, and further reduce the weight of the battery cover plate, which is beneficial to improving the energy density of the battery cell.

[0040] Specifically, Figure 4 and Figure 5 As shown, the battery cover includes a cover body 100, an insulating member 200 and a pole 300, wherein the insulating member 200 is arranged on one side surface of the cover body 100, and a protruding structure 210 is provided on the side of the insulating member 200 away from the cover body 100, and the pole 300 includes a column 310 and a first support 320, the column 310 is connected to the first support 320, the column 310 is penetrated by the insulating member 200 and the cover body 100, and the first support 320 is spaced apart from the side of the insulating member 200 away from the cover body 100 and abuts against the protruding structure 210.

[0041] Based on the above design, a protruding structure 210 is provided on the side of the insulating member 200 away from the cover body 100, and the pole 300 includes a column 310 and a first support 320 connected to each other. The column 310 is penetrated by the insulating member 200 and the cover body 100, and the first support 320 is spaced apart from the side of the insulating member 200 away from the battery cover, and the first support 320 is abutted against the protruding structure 210. The design of the protruding structure 210 leaves a gap 500 between the first support 320 and the side of the insulating member 200 away from the cover body 100, thereby achieving the effect of reducing the volume and weight of the pole 300, reducing the weight of the battery cover, and helping to improve the energy density of the battery cell.

[0042] Furthermore, the protruding structure 210 is evenly distributed within the positive projection of the first support 320 on the insulating member 200, so that after the first support 320 abuts against the protruding structure 210, its surface is parallel to the surface of the cover body 100, preventing the pole 300 from being skewed relative to the cover body 100.

[0043] Furthermore, if Figures 4 to 6 As shown, the protruding structure 210 includes an even number of first protruding portions 211 and an even number of second protruding portions 212, the even number of first protruding portions 211 are symmetrically arranged about the axis of the column 310 in the first direction, and the even number of second protruding portions 212 are symmetrically arranged about the axis of the column 310 in the second direction, and the first direction is perpendicular to the second direction, so that the surface of the first support 320 is evenly abutted against the protruding structure 210 to prevent the pole 300 from being skewed relative to the cover body 100.

[0044] In this embodiment, the first direction is the length direction of the insulating member 200 ( Figure 6 The second direction is the width direction of the insulating member 200 ( Figure 6 Of course, in other embodiments, the first direction and the second direction may also be other two directions perpendicular to each other.

[0045] In this embodiment, the number of the first protrusions 211 and the number of the second protrusions 212 are both two. Of course, in other embodiments, the number of the first protrusions 211 and the second protrusions 212 may also be four or six or other even numbers, and the number of the first protrusions 211 and the second protrusions 212 may also be unequal, depending on the surface area of ​​the first support 320.

[0046] Furthermore, if Figures 4 to 6As shown, the first protrusion 211 is connected to the adjacent second protrusion 212, that is, the protrusion structure 210 is roughly grid-shaped, and the axis of the column 310 is roughly located at the center of the grid-shaped protrusion structure 210. This structural design can not only make the surface of the first support 320 evenly abut against the protrusion structure 210, but also expand the abutment area between the protrusion structure 210 and the first support 320, thereby improving the stability of the abutment between the two.

[0047] Alternatively, if Figures 4 to 6 As shown, a limiting groove 230 is provided on the side of the insulating member 200 facing away from the cover body 100, the first support 320 is stuck in the limiting groove 230, the protruding structure 210 is located at the bottom of the limiting groove 230, and the first support 320 is spaced from the bottom of the limiting groove 230 and abuts against the protruding structure 210 on the side facing the cover body 100, thereby limiting the pole 300.

[0048] Furthermore, if Figures 4 to 6 As shown, the two ends of the first protrusion 211 are respectively connected to the two inner walls of the limiting groove 230 in the y direction, and the two ends of the second protrusion 212 are respectively connected to the two inner walls of the limiting groove 230 in the x direction, further expanding the abutment area between the protrusion structure 210 and the first support 320 and improving the stability of the abutment between the two.

[0049] Alternatively, if Figures 4 to 6 As shown, the height of the first support 320 is e, 0.5mm≤e≤2.0mm. Exemplarily, e can be 0.5mm, 0.8mm, 1.5mm or 2.0mm, etc., which can ensure that the first support 320 has sufficient thickness for welding with the tab, but will not make the first support 320 too thick to increase the weight of the battery cover.

[0050] Alternatively, if Figures 4 to 6 As shown, the battery cover further includes a sealing ring 400 , and the pole 300 is sealedly connected to the cover body 100 via the sealing ring 400 .

[0051] Specifically, Figures 4 to 6As shown, the cover body 100 is provided with a first pole hole (not shown in the figure), the insulating member 200 is provided with a second pole hole 220, the column 310 is penetrated through the first pole hole and the second pole hole 220, the aperture of the first pole hole is smaller than the aperture of the second pole hole 220, the pole 300 also includes a second support 330, the column 310 is connected to the first support 320 through the second support 330, the second support 330 is located on the side of the cover body 100 where the insulating member 200 is provided, the sealing ring 400 includes a first sealing section 410, the first sealing section 410 is sleeved on the column 310, the first sealing section 410 is clamped between the second support 330 and the cover body 100, that is, the first sealing section 410 is clamped between the second support 330 and the edge of the first pole hole, so as to realize the sealed connection between the pole 300 and the cover body 100.

[0052] In another embodiment, the aperture of the first pole hole is smaller than the aperture of the second pole hole 220, part of the first sealing section 410 is clamped between the second support 330 and the edge of the first pole hole, and another part of the first sealing section 410 is clamped between the second support 330 and the edge of the second pole hole 220 to achieve a sealed connection between the pole 300 and the cover body 100.

[0053] In another embodiment, the aperture of the first pole hole is equal to the aperture of the second pole hole 220, and the first sealing section 410 is clamped between the second support 330 and the insulating member 200, that is, the first sealing section 410 is clamped between the second support 330 and the edge of the second pole hole 220 to achieve a sealed connection between the pole 300 and the cover body 100.

[0054] Furthermore, if Figures 4 to 6 As shown, the sealing ring 400 also includes a second sealing segment 420, which is sleeved on the column 310 and connected to the first sealing segment 410. The second sealing segment 420 is clamped between the side wall of the column 310 and the hole wall of the first pole hole to achieve sealing between the column 310 and the hole wall of the first pole hole, thereby improving the sealing between the pole 300 and the cover body 100.

[0055] Alternatively, if Figures 4 to 7 As shown, the height of the second support 330 is f, and the height of the protruding structure 210 protruding from the surface of the insulating member 200 is g, and f is equal to g. If f is less than g, the first sealing section 410 cannot be tightly pressed between the second support 330 and the edge of the first pole hole, thereby reducing the sealing between the pole 300 and the cover body 100. If f is greater than g, the volume and weight of the second support 330 will be increased, thereby increasing the weight of the battery cover, which is not conducive to improving the energy density of the battery cell.

[0056] This embodiment also provides a battery cell having a high energy density.

[0057] Specifically, the battery cell comprises a shell, an electrode group and the above-mentioned battery cover, the electrode group is arranged in the shell, the cover body 100 is covered at the opening of the shell, and the insulating member 200 is located on the side of the cover body 100 facing the shell. The battery cell adopts the above-mentioned battery cover, and since the battery cover is light in weight, the energy density of the battery cell is improved.

[0058] Furthermore, a pole lug is provided on one side of the pole group facing the cover body 100 , and the pole lug is welded to a side of the first support 320 facing the pole group, so as to realize conductive connection between the pole group and the pole column 300 .

[0059] Optionally, the battery cell is a blade battery cell, and the insulating member 200 is provided with a side edge (not shown in the figure) protruding toward one side of the housing, and the side edge is located at the insulating member 200 in the width direction ( Figure 6 The side edge is at the edge in the y direction) and is used for thermal melting connection with the pole group.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery cover, characterized in that: include: Cover plate body (100); An insulating member (200), the insulating member (200) being arranged on a surface of one side of the cover body (100), and a protruding structure (210) being arranged on a side of the insulating member (200) facing away from the cover body (100); A pole (300), the pole (300) comprising a column (310) and a first support (320), the column (310) being connected to the first support (320), the column (310) being inserted through the insulating member (200) and the cover body (100), the first support (320) being spaced apart from a side of the insulating member (200) away from the cover body (100) and abutting against the protruding structure (210).

2. The battery cover according to claim 1, characterized in that: The protruding structures (210) are evenly distributed within the orthographic projection of the first support (320) on the insulating member (200).

3. The battery cover according to claim 2, characterized in that: The protruding structure (210) comprises an even number of first protruding portions (211) and an even number of second protruding portions (212), wherein the even number of the first protruding portions (211) are symmetrically arranged in a first direction about the axis of the column (310), and the even number of the second protruding portions (212) are symmetrically arranged in a second direction about the axis of the column (310), and the first direction is perpendicular to the second direction.

4. The battery cover according to claim 3, characterized in that: The first protruding portion (211) is connected to the adjacent second protruding portion (212).

5. The battery cover according to any one of claims 1 to 4, characterized in that: The height of the first support (320) is e, 0.5mm≤e≤2.0mm.

6. The battery cover according to any one of claims 1 to 4, characterized in that: The battery cover plate further comprises a sealing ring (400), and the pole (300) is sealedly connected to the cover plate body (100) via the sealing ring (400).

7. The battery cover according to claim 6, characterized in that: The pole (300) further comprises a second support (330), the column (310) is connected to the first support (320) via the second support (330), the second support (330) is located on a side of the cover body (100) on which the insulating member (200) is provided, the sealing ring (400) comprises a first sealing section (410), the first sealing section (410) is sleeved on the column (310), the first sealing section (410) is clamped between the second support (330) and the cover body (100), and / or the first sealing section (410) is clamped between the second support (330) and the insulating member (200).

8. The battery cover according to claim 7, characterized in that: The sealing ring (400) further comprises a second sealing section (420), the second sealing section (420) being sleeved on the column (310) and connected to the first sealing section (410), the cover plate body (100) being provided with a first pole hole, the second sealing section (420) being sandwiched between the side wall of the column (310) and the hole wall of the first pole hole.

9. The battery cover according to claim 7, characterized in that: The height of the second support (330) is f, the height of the protruding structure (210) protruding from the surface of the insulating member (200) is g, and f is equal to g.

10. A battery cell, characterized in that: It comprises a shell, a pole group and a battery cover according to any one of claims 1 to 9, wherein the pole group is arranged in the shell, and the cover body (100) is covered at the opening of the shell.

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