Battery top cover and power battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover and a power battery, the battery top cover comprises a top cover sheet, a first insulating part, a pole and a sealing ring, the top cover sheet is provided with a mounting hole, the first insulating part is arranged on the surface of the top cover sheet, a gap is reserved between the first insulating part and the top cover sheet, the pole comprises a base and a column body, and the sealing ring is arranged on the base. The base is located on the side, away from the first insulating piece, of the top cover piece, one end of the column body is connected with the base, the other end of the column body penetrates through the mounting hole and the first insulating piece, the column body is sleeved with the sealing ring, part of the sealing ring is clamped between the base and the top cover piece, and the other part of the sealing ring is clamped between the side wall of the column body and the hole wall of the mounting hole. The battery top cover is simple in structure, and the effectiveness of air tightness detection can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery top cover and a power battery. Background Art

[0002] The top cover of a power battery usually includes a top cover sheet, an upper plastic, a lower plastic, a sealing ring and a pole, wherein the upper plastic and the lower plastic are respectively arranged on two opposite surfaces of the top cover sheet, the sealing ring is sleeved on the pole, and the pole is sequentially penetrated by the lower plastic, the top cover sheet and the upper plastic.

[0003] The sealing ring is used to ensure the sealing performance between the battery cell and the top cover piece. After the top cover is assembled, it is usually necessary to perform an airtightness test on the top cover. However, since the upper plastic and the top cover piece are tightly fitted, when the sealing ring is missing, a temporary sealing effect can still be achieved between the upper plastic and the top cover piece, so that the top cover without the sealing ring passes the airtightness test and is regarded as a qualified product and enters the next production process, which reduces the safety and reliability of the power battery.

[0004] Therefore, it is urgent to propose a battery top cover and a power battery to solve the above technical problems. Utility Model Content

[0005] The first object of the utility model is to provide a battery top cover, which has a simple structure and can effectively improve the effectiveness of airtightness detection.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Battery cover, including:

[0008] A top cover sheet, wherein the top cover sheet is provided with a mounting hole;

[0009] A first insulating member, the first insulating member is arranged on the surface of the top cover sheet, and a gap is left between the first insulating member and the top cover sheet;

[0010] The pole comprises a base and a column, wherein the base is located on the side of the top cover sheet away from the first insulating member, one end of the column is connected to the base, and the other end is sequentially passed through the mounting hole and the first insulating member;

[0011] The sealing ring is sleeved on the column, and part of the sealing ring is clamped between the base and the top cover sheet, and the other part of the sealing ring is clamped between the side wall of the column and the hole wall of the installation hole.

[0012] Optionally, at least a portion of the surface of the first insulating member facing the top cover sheet is a first rough surface, and the area where the top cover sheet and the first rough surface are in contact is a plane.

[0013] Optionally, the entire surface of the first insulating member facing the top cover sheet is a first rough surface.

[0014] Optionally, the surface roughness of the first rough surface is greater than 3 μm.

[0015] Optionally, the battery top cover further includes a second insulating member, and the second insulating member covers the surface of the top cover sheet on the side facing away from the first insulating member.

[0016] Optionally, the orthographic projection of the second insulating member on the top cover sheet does not overlap with the orthographic projection of the base on the top cover sheet.

[0017] Optionally, at least a part of the surface of the second insulating member facing the top cover sheet is a second rough surface, and the area where the top cover sheet is in contact with the second rough surface is a flat surface.

[0018] Optionally, all the surfaces of the second insulating member facing the top cover sheet are second rough surfaces.

[0019] Optionally, the surface roughness of the second rough surface is greater than 3 μm.

[0020] The second object of the present utility model is to provide a power battery, which has high use safety and use reliability.

[0021] To achieve this purpose, the present utility model adopts the following technical solutions:

[0022] The power battery includes a battery cell, a housing, and the above-mentioned battery top cover. The battery cell is arranged in the housing, and the top cover sheet covers the opening of the housing.

[0023] The beneficial effects of the present utility model:

[0024] For the battery top cover provided by the present utility model, the sealing ring is sleeved on the column body, and part of the sealing ring is clamped between the base and the top cover sheet, and the other part of the sealing ring is clamped between the side wall of the column body and the hole wall of the mounting hole. The first insulating member is arranged on the surface of the top cover sheet, and the first insulating member and the top cover sheet are not in close contact but have a gap. Therefore, the sealing of the battery top cover is only provided by the sealing ring, and the first insulating member and the top cover sheet cannot play a short-term sealing effect. During the airtightness detection, if a battery top cover with a missing sealing ring is encountered, the gaps between the first insulating member and the top cover sheet, between the side wall of the column body and the hole wall of the mounting hole, and between the base and the top cover sheet will form an air flow channel, making the battery top cover with a missing sealing ring unable to pass the airtightness detection. The structure of this battery top cover is simple, and it can effectively improve the effectiveness of the airtightness detection, providing a strong guarantee for the use safety and use reliability of the power battery.

[0025] The power battery provided by the present utility model adopts the above-mentioned battery top cover, and the effectiveness of the airtightness detection of the battery top cover is relatively high, thereby improving the use safety and use reliability of the power battery. Description of the Drawings

[0026] Figure 1 is a schematic structural view of a battery top cover provided by an embodiment of the present utility model;

[0027] Figure 2 is a schematic structural view of a first insulating member facing one side of a top cover sheet;

[0028] Figure 3 is a schematic cross-sectional structural view of a battery top cover provided by an embodiment of the present utility model;

[0029] Figure 4 is Figure 3 a partial enlarged view at A in

[0030] Figure 5 is a schematic structural view of a top cover sheet facing one side of a first insulating member;

[0031] Figure 6 is a schematic structural view of a second insulating member facing one side of a top cover sheet;

[0032] Figure 7 is a schematic structural view of a top cover sheet facing one side of a second insulating member.

[0033] In the figure:

[0034] 100, top cover sheet; 110, mounting hole; 120, positioning groove; 200, first insulating member; 210, first rough surface; 300, pole; 310, base; 320, column body; 400, sealing ring; 500, second insulating member; 510, second rough surface; 600, pressing block. Detailed implementation manners

[0035] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the sake of description, only parts related to the present utility model are shown in the drawings, rather than all structures.

[0036] In the description of the present utility model, unless otherwise clearly defined 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 body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0037] In the present utility model, 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., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified 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 a limitation of 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 top cover, which has a simple structure and can effectively improve the effectiveness of airtightness detection.

[0040] Specifically, Figures 1 to 4 As shown, the battery top cover includes a top cover sheet 100, a first insulating member 200, a pole 300 and a sealing ring 400, wherein the top cover sheet 100 is provided with a mounting hole 110, the first insulating member 200 is arranged on the surface of the top cover sheet 100, and a gap is left between the first insulating member 200 and the top cover sheet 100, the pole 300 includes a base 310 and a column 320, the base 310 is located on the side of the top cover sheet 100 away from the first insulating member 200, one end of the column 320 is connected to the base 310, and the other end is sequentially penetrated through the mounting hole 110 and the first insulating member 200, the sealing ring 400 is sleeved on the column 320, and part of the sealing ring 400 is clamped between the base 310 and the top cover sheet 100, and the other part of the sealing ring 400 is clamped between the side wall of the column 320 and the hole wall of the mounting hole 110.

[0041] The battery top cover provided in this embodiment has a sealing ring 400 sleeved on the column 320, and part of the sealing ring 400 is clamped between the base 310 and the top cover sheet 100, and the other part of the sealing ring 400 is clamped between the side wall of the column 320 and the hole wall of the mounting hole 110. The first insulating member 200 is disposed on the surface of the top cover sheet 100, and there is a gap between the first insulating member 200 and the top cover sheet 100 instead of being in close contact. Therefore, the sealing of the battery top cover is only provided by the sealing ring 400, and there is no short-term sealing effect between the first insulating member 200 and the top cover sheet 100. During the airtightness detection, if a battery top cover with the sealing ring 400 missing is encountered, the gaps between the first insulating member 200 and the top cover sheet 100, between the side wall of the column 320 and the hole wall of the mounting hole 110, and between the base 310 and the top cover sheet 100 will form an air flow channel, making the battery top cover with the sealing ring 400 missing unable to pass the airtightness detection. This battery top cover can effectively improve the effectiveness of airtightness detection, providing a strong guarantee for the use safety and reliability of power batteries. Moreover, the structure of this battery top cover is simple, and the effectiveness of airtightness detection can be effectively improved without excessive production costs.

[0042] Optionally, as Figures 1 to 4 shown, at least part of the surface of the first insulating member 200 facing the top cover sheet 100 is a first rough surface 210, and the area of the top cover sheet 100 that fits with the first rough surface 210 is a flat surface, thereby forming a gap between the first rough surface 210 and the top cover sheet 100. In addition, compared with setting a rough surface on the side of the top cover sheet 100 facing the first insulating member 200, setting the first rough surface 210 on the side of the first insulating member 200 facing the top cover sheet 100 in this embodiment will not reduce the structural strength of the top cover sheet 100.

[0043] Preferably, as Figures 1 to 4 shown, all surfaces of the first insulating member 200 facing the top cover sheet 100 are the first rough surface 210, expanding the gap between the first insulating member 200 and the top cover sheet 100 and further improving the effectiveness of airtightness detection of the battery top cover. Moreover, the design that all surfaces of the first insulating member 200 facing the top cover sheet 100 are the first rough surface 210 can cover some external shape defects on the side of the first insulating member 200 facing the top cover sheet 100, such as shrinkage defects, glue joint line defects, parting surface defects and other production trace problems of the first insulating member 200, thereby having the effect of improving the product appearance.

[0044] Optionally, the surface roughness of the first rough surface 210 is greater than 3μm. Exemplarily, the surface roughness of the first rough surface 210 can be 3μm, 3.2μm or 4μm, etc., making the gap between the first insulating member 200 and the top cover sheet 100 large enough to ensure the effectiveness of airtightness detection of the battery top cover.

[0045] Alternatively, if Figures 1 to 5 As shown, a positioning groove 120 is provided on the top cover sheet 100, and the first insulating member 200 is embedded in the positioning groove 120 to facilitate positioning of the first insulating member 200. The mounting hole 110 is located at the bottom of the positioning groove 120, and the first rough surface 210 is the surface of the first insulating member 200 facing the bottom of the positioning groove 120. The bottom of the positioning groove 120 is a plane, and the first rough surface 210 fits with the bottom of the positioning groove 120 to form a gap between the first insulating member 200 and the top cover sheet 100.

[0046] Alternatively, if Figures 1 to 6 As shown, the battery top cover also includes a second insulating member 500, which covers the surface of the top cover sheet 100 away from the first insulating member 200, and the column 320 is penetrated by the second insulating member 500 to achieve the insulation effect on the side of the top cover sheet 100 away from the first insulating member 200.

[0047] Alternatively, if Figures 1 to 6 As shown, the orthographic projection of the second insulating member 500 on the top cover sheet 100 does not overlap with the orthographic projection of the base 310 on the top cover sheet 100. Although the second insulating member 500 and the base 310 are both located on the side of the top cover sheet 100 away from the first insulating member 200, the orthographic projection of the second insulating member 500 on the top cover sheet 100 and the orthographic projection of the base 310 on the top cover sheet 100 are staggered with each other to avoid a temporary sealing effect due to the stacking of the second insulating member 500 and the base 310 on the top cover sheet 100. It can be seen that this structural design provides further protection for improving the effectiveness of airtightness testing.

[0048] Alternatively, if Figures 1 to 6 As shown, at least part of the surface of the second insulating member 500 facing the top cover sheet 100 is a second rough surface 510, and the area where the top cover sheet 100 and the second rough surface 510 are in contact is a plane, thereby forming a gap between the second insulating member 500 and the top cover sheet 100. When performing an airtightness test, if a battery top cover without the sealing ring 400 is encountered, the gap between the second insulating member 500 and the top cover sheet 100 is also an air flow channel, so that the battery top cover without the sealing ring 400 can be quickly detected, thereby improving the sensitivity of the airtightness test.

[0049] Alternatively, if Figures 1 to 7As shown, the entire surface of the second insulating member 500 facing the top cover sheet 100 is the second rough surface 510, that is, the entire surface of the top cover sheet 100 facing the second insulating member 500 is a plane, which expands the gap between the second insulating member 500 and the top cover sheet 100, and further improves the sensitivity of the airtightness detection. In addition, the design that the entire surface of the second insulating member 500 facing the top cover sheet 100 is the second rough surface 510 can cover some of the appearance defects of the second insulating member 500 facing the top cover sheet 100, such as shrinkage defects, glue line defects, parting surface defects and other production traces of the second insulating member 500, thereby improving the appearance of the product.

[0050] Optionally, the surface roughness of the second rough surface 510 is greater than 3 μm. Exemplarily, the surface roughness of the second rough surface 510 may be 3 μm, 3.2 μm or 4 μm, etc., so that the gap between the second insulating member 500 and the top cover sheet 100 is large enough to ensure the sensitivity of the battery top cover airtightness detection.

[0051] Alternatively, if Figures 1 to 7 As shown, the battery top cover also includes a pressing block 600, which is arranged on the side of the first insulating member 200 away from the top cover sheet 100, and the column 320 passes through the second insulating member 500, the mounting hole 110 of the top cover sheet 100, the first insulating member 200 and the pressing block 600 in sequence, and the column 320 is fixedly connected to the pressing block 600, thereby realizing the conductive connection between the pole 300 and the pressing block 600.

[0052] It should be noted that the first rough surface 210 and the second rough surface 510 may be sun-textured, embossed or other uneven surfaces.

[0053] In this embodiment, the first insulating member 200 and the second insulating member 500 are both plastic members, the top cover sheet 100 is a plain aluminum sheet, and the pressing block 600 is an aluminum block. Of course, in other embodiments, the first insulating member 200, the second insulating member 500, the top cover sheet 100 and the pressing block 600 can also be made of other materials, which will not be described here.

[0054] This embodiment also provides a power battery with high safety and reliability in use.

[0055] Specifically, the power battery includes a battery cell, a shell and the battery top cover, wherein the battery cell is arranged in the shell, and the top cover sheet 100 is arranged at the opening of the shell. The power battery adopts the battery top cover, and the effectiveness of the airtightness detection of the battery top cover is high, thereby improving the safety and reliability of the power battery.

[0056] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A battery cover, characterized in that: include: A top cover sheet (100), wherein the top cover sheet (100) is provided with a mounting hole (110); A first insulating member (200), wherein the first insulating member (200) is arranged on the surface of the top cover sheet (100), and a gap is left between the first insulating member (200) and the top cover sheet (100); A pole (300), the pole (300) comprising a base (310) and a column (320), the base (310) being located on a side of the top cover sheet (100) away from the first insulating member (200), one end of the column (320) being connected to the base (310), and the other end of the column (320) being sequentially passed through the mounting hole (110) and the first insulating member (200); A sealing ring (400), wherein the sealing ring (400) is sleeved on the column (320), and a portion of the sealing ring (400) is sandwiched between the base (310) and the top cover sheet (100), and another portion of the sealing ring (400) is sandwiched between the side wall of the column (320) and the hole wall of the mounting hole (110).

2. The battery top cover according to claim 1, characterized in that: At least part of the surface of the first insulating member (200) facing the top cover sheet (100) is a first rough surface (210), and the area where the top cover sheet (100) and the first rough surface (210) are in contact is a plane.

3. The battery top cover according to claim 2, characterized in that: The entire surface of the first insulating member (200) on the side facing the top cover sheet (100) is the first rough surface (210).

4. The battery top cover according to claim 2, characterized in that: The surface roughness of the first rough surface (210) is greater than 3 μm.

5. The battery top cover according to any one of claims 1 to 4, characterized in that: The battery top cover also includes a second insulating member (500), and the second insulating member (500) covers the surface of the top cover sheet (100) on a side facing away from the first insulating member (200).

6. The battery top cover according to claim 5, characterized in that: The orthographic projection of the second insulating member (500) on the top cover sheet (100) does not overlap with the orthographic projection of the base (310) on the top cover sheet (100).

7. The battery top cover according to claim 5, characterized in that: At least part of the surface of the second insulating member (500) facing the top cover sheet (100) is a second rough surface (510), and the area where the top cover sheet (100) and the second rough surface (510) are in contact is a plane.

8. The battery top cover according to claim 7, characterized in that: The entire surface of the second insulating member (500) on the side facing the top cover sheet (100) is the second rough surface (510).

9. The battery top cover according to claim 7, characterized in that: The surface roughness of the second rough surface (510) is greater than 3 μm.

10. A power battery, characterized in that: The battery comprises a battery cell, a shell and a battery top cover according to any one of claims 1 to 9, wherein the battery cell is arranged in the shell, and the top cover sheet (100) is arranged to cover the opening of the shell.

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