Battery top cover and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover and a battery monomer. The battery top cover comprises a cover plate sheet, an upper insulating piece and a connecting piece, the upper insulating part is provided with a first pole hole and is arranged above the cover plate sheet; the connecting piece is provided with a second pole hole, the connecting piece is located above the upper insulating piece, and the second pole hole corresponds to the first pole hole. The upper insulating part further comprises a first protruding part, the first protruding part protrudes out of the upper surface of the upper insulating part, and the first protruding part is arranged around the first pole hole; and / or the connecting piece further comprises a second protruding part, the second protruding part protrudes out of the lower surface of the connecting piece, and the second protruding part is arranged around the second pole hole. The first protruding part can reserve the deformation springback amount for the extrusion deformation of the upper insulating part, and the second protruding part can reserve the deformation amount for the riveting deformation of the connecting piece, so that the flatness of the connecting piece and the upper insulating part after riveting is improved, the edge warping risk of the connecting piece is reduced, and the dimensional precision is ensured.

Description

Technical Field

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

[0002] With the development of modern society and the increasing awareness of environmental protection, more and more devices are choosing batteries as power sources, such as mobile phones, laptops, power tools, and electric vehicles. This provides a broad space for the application and development of batteries, but at the same time, the requirements for battery performance and safety are also increasing. The battery cover is a key component of the battery, which is directly related to its reliability, service life, and capacity, affecting the production and use safety of manufacturers and consumers.

[0003] In existing battery top covers, the terminal and rivet block are typically riveted to the cover plate. An upper insulator is placed between the rivet block and the cover plate to provide insulation and prevent the formation of a current loop between the rivet block and the cover plate. However, because the rivet block is only subjected to pressure in the middle during terminal riveting, it is prone to becoming concave in the middle and warping on both sides. When the rivet block is squeezed, the narrower areas of the rivet hole expand outward, causing the rivet block to have dimensional tolerances that seriously affect battery assembly.

[0004] Therefore, there is an urgent need for a battery top cover and a battery cell to solve the above problems. Utility Model Content

[0005] One purpose of the utility model is to provide a battery top cover, which can reserve deformation for riveting of the battery top cover, reduce the deformation degree of the battery top cover after riveting, and ensure the assembly accuracy of the battery top cover.

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

[0007] A battery top cover is provided, comprising:

[0008] Cover plate;

[0009] an upper insulating member, wherein the upper insulating member is provided with a first pole hole and is disposed above the cover plate;

[0010] A connecting member, wherein the connecting member is provided with a second pole hole, the connecting member is located above the upper insulating member, and the second pole hole is provided corresponding to the first pole hole;

[0011] The upper insulating member further includes a first protrusion, the first protrusion protruding from the upper surface of the upper insulating member, and the first protrusion is arranged around the first pole hole;

[0012] And / or, the connector further includes a second protrusion, the second protrusion protrudes from the lower surface of the connector, and the second protrusion is arranged around the second pole hole.

[0013] As an optional solution for the battery top cover, the height of the first protrusion is A, wherein 0.05mm <A<0.2mm。

[0014] As an optional solution for the battery top cover, the height of the second protrusion is B, wherein 0.05mm <B<0.2mm。

[0015] As an optional solution for the battery top cover, the battery top cover further includes a lower insulating member, and the lower insulating member is located below the cover plate.

[0016] As an optional solution for the battery top cover, the lower insulating member includes a third protrusion, and the third protrusion protrudes from the upper surface of the lower insulating member.

[0017] As an optional solution for the battery top cover, the height of the third protrusion is C, where 0.05mm <C<0.2mm。

[0018] As an optional solution for the battery top cover, the battery top cover also includes a pole, the cover plate is provided with a third pole hole, the pole is passed through the third pole hole, the first pole hole, the second pole hole and is connected to the connecting piece.

[0019] As an optional solution for the battery top cover, the battery top cover further includes a sealing ring, which is sleeved on the pole and located between the cover plate and the pole.

[0020] As an optional solution for the battery top cover, the battery top cover further includes an explosion-proof structure, the cover plate is further provided with an explosion-proof hole, and the explosion-proof structure is connected to the cover plate and covers the explosion-proof hole.

[0021] Another object of the present utility model is to provide a battery cell that can reduce riveting deformation of the battery top cover and ensure assembly accuracy of the battery cell.

[0022] To achieve this purpose, the present invention adopts the following technical solutions:

[0023] Provided is a battery cell, comprising a battery core, a shell and the above-mentioned battery top cover, wherein the battery core is arranged in the shell, and the battery top cover is tightly connected to the opening of the shell.

[0024] Beneficial effects of the utility model:

[0025] The utility model provides a battery top cover, comprising a connector, an upper insulating member, and a cover plate, arranged in sequence from top to bottom. The upper insulating member is provided with a first terminal hole, the connector is provided with a second terminal hole, the upper surface of the upper insulating member includes a first protrusion surrounding the first terminal hole, or the lower surface of the connector is provided with a second protrusion surrounding the second terminal hole, or the upper surface of the upper insulating member includes the first protrusion and the lower surface of the connector is provided with the second protrusion. When the battery top cover is riveted and assembled, the upper insulating member and the connector are squeezed against each other, resulting in a reduction in the thickness of the squeezed portion, a reduction in the flatness of the contact surface between the upper insulating member and the connector, and thus a warping phenomenon of the connector. The first protrusion can reserve deformation rebound for the extrusion deformation of the upper insulating member, and the second protrusion can reserve deformation for the riveting deformation of the connector, so that the thickness of the extruded part of the connector and the upper insulating member is consistent with the thickness of the non-extruded part after riveting and extrusion, thereby improving the flatness of the connector and the upper insulating member, reducing the risk of warping of the connector, ensuring the dimensional accuracy and performance of the battery top cover, reducing the scrap rate of assembled battery top covers, and saving production costs.

[0026] The utility model also provides a battery cell, comprising a battery core, a shell and the above-mentioned battery top cover. By using the above-mentioned battery top cover, the battery cell can ensure the assembly accuracy of the battery cell and ensure the working performance and service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is an exploded view of the battery top cover provided by the present utility model;

[0028] Figure 2 This is a cross-sectional view of the upper insulating member of the battery top cover provided by the present utility model;

[0029] Figure 3 This is a cross-sectional view of the connector of the battery top cover provided by the present utility model;

[0030] Figure 4 It is a partial cross-sectional view of the lower insulating member of the battery top cover provided by the present invention.

[0031] In the picture:

[0032] 1. Cover plate; 11. Third pole hole; 12. Explosion-proof hole;

[0033] 2. Upper insulating member; 21. First pole hole; 22. First protrusion;

[0034] 3. Connector; 31. Second pole hole; 32. Second protrusion;

[0035] 4. Lower insulating member; 41. Third protrusion;

[0036] 5. Pole; 51. Penetrating portion; 52. Abutting portion;

[0037] 6. Sealing ring;

[0038] 7. Explosion-proof structure; 71. Explosion-proof valve; 72. Explosion-proof disk. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0040] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0041] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0043] like Figures 1 to 4As shown in the figure, the battery top cover of this embodiment includes a cover plate 1, an upper insulating part 2, and a connecting part 3. The upper insulating part 2 is provided with a first pole hole 21 and is arranged above the cover plate 1. The connecting part 3 is provided with a second pole hole 31, is located above the upper insulating part 2, and the second pole hole 31 is correspondingly arranged with the first pole hole 21. The upper insulating part 2 further includes a first protruding part 22 that protrudes from the upper surface of the upper insulating part 2 and is arranged around the first pole hole 21; alternatively, the connecting part 3 further includes a second protruding part 32 that protrudes from the lower surface of the connecting part 3 and is arranged around the second pole hole 31; or, the upper insulating part 2 further includes a first protruding part 22 and the connecting part 3 further includes a second protruding part 32.

[0044] Based on the above design, the connecting part 3, the upper insulating part 2, and the cover plate 1 are arranged in sequence from top to bottom. The upper insulating part 2 is provided with a first pole hole 21, the connecting part 3 is provided with a second pole hole 31, the upper surface of the upper insulating part 2 is provided with a first protruding part 22 arranged around the first pole hole 21, or the lower surface of the connecting part 3 is provided with a second protruding part 32 arranged around the second pole hole 31, or the upper surface of the upper insulating part 2 is provided with a first protruding part 22 and the lower surface of the connecting part 3 is provided with a second protruding part 32. When the battery top cover is riveted and assembled, the upper insulating part 2 and the connecting part 3 are mutually extruded, resulting in a decrease in the thickness of the extruded part and a reduction in the flatness of the contact surface between the upper insulating part 2 and the connecting part 3, thereby causing the connecting part 3 to warp. The first protruding part 22 can reserve a deformation springback amount for the extrusion deformation of the upper insulating part 2, and the second protruding part 32 can reserve a deformation amount for the riveting deformation of the connecting part 3, so that the thickness of the extruded part of the connecting part 3 and the upper insulating part 2 after riveting extrusion is the same as that of the non-extruded part, thereby improving the flatness of the connecting part 3 and the upper insulating part 2, reducing the risk of the connecting part 3 warping, ensuring the dimensional accuracy and product quality of the battery top cover, reducing the rejection rate of assembling the battery top cover, and saving the production cost.

[0045] Preferably, the height of the first protruding part 22 is defined as A. Among them, when 0.05mm < A < 0.2mm is satisfied, it can not only ensure the structural strength of the upper insulating part 2 but also ensure the flatness of the upper surface of the upper insulating part 2 after riveting. Exemplarily, the height of the first protruding part 22 can be set to 0.05mm, 0.1mm, 0.15mm, 0.2mm, etc.

[0046] Preferably, the height of the second protruding part 32 is defined as B. Among them, when 0.05mm < B < 0.2mm is satisfied, it can not only ensure the structural strength of the connecting part 3 but also ensure the flatness of the lower surface of the connecting part 3 after riveting. Exemplarily, the height of the second protruding part 32 can be set to 0.05mm, 0.1mm, 0.15mm, 0.2mm, etc.

[0047] It should be noted that to ensure the overall height of the battery top cover, the upper surface of the upper insulating member 2 can be cut away from all sides, thereby forming a first protrusion 22 in the middle of the upper surface of the upper insulating member 2, resulting in a greater thickness at the first protrusion 22. Alternatively, the lower surface of the connector 3 can be cut away from all sides, leaving the middle portion thicker to form the second protrusion 32. This arrangement avoids the need to add the first protrusion 22 to the upper surface of the upper insulating member 2 or the second protrusion 32 to the lower surface of the connector 3, which would increase the height of the battery cover and increase the difficulty of installing the top cover and the volume of the battery cell. Furthermore, the material removal method can reduce the weight of the battery top cover. According to calculations, while ensuring the appropriate heights of the first protrusion 22 and the second protrusion 32, the weight of a single connector 3 removed is approximately 0.1g, and the weight of a single upper insulating member 2 removed is approximately 0.08g.

[0048] Furthermore, the battery top cover also includes a terminal 5. The cover plate 1 is provided with a third terminal hole 11. The terminal 5 is inserted into the third terminal hole 11, the first terminal hole 21, and the second terminal hole 31 and is connected to the connector 3. Specifically, the terminal 5 includes a penetration portion 51 and an abutment portion 52. The penetration portion 51 penetrates the third terminal hole 11, the first terminal hole 21, and the second terminal hole 31 and is connected to the connector 3 at the top. The abutment portion 52 is connected to the bottom of the penetration portion 51 and abuts the cover plate 1. The abutment portion 52 and the connector 3 clamp and fix the cover plate 1 and the upper insulating member 2, thereby achieving assembly of the battery top cover.

[0049] Furthermore, the battery top cover also includes a lower insulating member 4, which is located below the cover plate 1. Specifically, the lower insulating member 4 is located between the abutting portion 52 and the cover plate 1 to ensure effective insulation between the abutting portion 52 and the cover plate 1.

[0050] During the actual assembly of the battery cover, the portion of the lower insulator 4 near the terminal 5 is subjected to significant tension, making the portion of the lower insulator 4 away from the terminal 5 susceptible to warping and deformation. This makes assembly of the lower insulator 4 with the terminal 5 and other components difficult, and even affects the insulation between the lower insulator 4 and the cover plate 1, significantly affecting the assembly efficiency and safety performance of the battery. Typically, reinforcing ribs are added to the side of the lower insulator 4 facing away from the cover plate 1 to strengthen the structural strength of the lower insulator 4 and reduce its deformation.

[0051] However, by providing reinforcing ribs on the lower insulating member 4, not only will the weight of the lower insulating member 4 be increased, but the reinforcing effect of the reinforcing ribs on the structure of the lower insulating member 4 is limited. After assembling the battery top cover, manual correction is required, and the lower insulating member 4 will still rebound after manual correction, affecting the correction effect. Therefore, a third protruding portion 41 is provided on the lower insulating member 4. The third protruding portion 41 protrudes from the upper surface of the lower insulating member 4. In this embodiment, the third protruding portion 41 is a back adhesive. The lower insulating member 4 is bonded to the cover plate 1 through the third protruding portion 41, improving the fitting degree between the lower insulating member 4 and the cover plate 1, reducing the degree of deformation and separation between the lower insulating member 4 and the cover plate 1 during the riveting assembly of the battery top cover, and ensuring the structural stability of the lower insulating member 4. At the same time, providing the third protruding portion 41 can also cancel the setting of the reinforcing ribs, reducing the weight of the lower insulating member 4.

[0052] Preferably, the height of the third protruding portion 41 is defined as C. Among them, when 0.05 mm < C < 0.2 mm is satisfied, it can ensure that the deformation degree of the lower insulating member 4 is relatively small. Exemplarily, the height of the third protruding portion 41 can be 0.05 mm, 0.1 mm, 0.15 mm or 0.2 mm, etc.

[0053] Furthermore, the battery top cover further includes a sealing ring 6. The sealing ring 6 is sleeved on the pole column 5 and is located between the cover plate 1 and the pole column 5, achieving the seal between the pole column 5 and the cover plate 1.

[0054] Furthermore, the battery top cover further includes an explosion-proof structure 7. The cover plate 1 is further provided with an explosion-proof hole 12. The explosion-proof structure 7 is connected to the cover plate 1 and covers the explosion-proof hole 12. Specifically, the explosion-proof structure 7 includes an explosion-proof valve 71 and an explosion-proof sheet 72. The explosion-proof valve 71 is connected to the side of the cover plate 1 facing the interior of the battery and covers the explosion-proof hole 12. There are score marks on the explosion-proof valve 71. When the internal air pressure of the battery structure is too high, the score mark on the explosion-proof valve 71 can rupture due to the small thickness under the action of high-pressure gas, thereby releasing the high-pressure gas and achieving the exhaust of the battery structure, ensuring the safety of the battery structure. The explosion-proof sheet 72 is connected to the side of the cover plate 1 facing away from the interior of the battery and covers the explosion-proof hole 12, preventing foreign objects from knocking and scratching the explosion-proof valve 71 during the assembly or use of the battery cover, and ensuring the good function of the explosion-proof valve 71.

[0055] This embodiment also provides a battery cell, including a battery core, a housing, and the above-mentioned battery top cover. The battery core is disposed in the housing, and the battery top cover is hermetically connected to the opening of the housing. This battery cell can ensure the assembly accuracy of the battery cell, and ensure the working performance and service life of the battery cell.

[0056] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery top cover, characterized in that: include: Cover plate (1); An upper insulating member (2), the upper insulating member (2) being provided with a first pole hole (21), and the upper insulating member (2) being arranged above the cover plate (1); A connecting member (3), wherein the connecting member (3) is provided with a second pole hole (31), the connecting member (3) is located above the upper insulating member (2), and the second pole hole (31) is provided corresponding to the first pole hole (21); The upper insulating member (2) further comprises a first protruding portion (22), the first protruding portion (22) protruding from the upper surface of the upper insulating member (2), and the first protruding portion (22) is arranged around the first pole hole (21); And / or, the connecting member (3) further includes a second protrusion (32), the second protrusion (32) protruding from the lower surface of the connecting member (3), and the second protrusion (32) is arranged around the second pole hole (31).

2. The battery top cover according to claim 1, characterized in that: The height of the first protrusion (22) is A, wherein 0.05 mm <A<0.2mm。 3. The battery top cover according to claim 1, characterized in that: The height of the second protrusion (32) is B, wherein 0.05 mm <B<0.2mm。 4. The battery top cover according to claim 1, characterized in that: The battery top cover further comprises a lower insulating member (4), and the lower insulating member (4) is located below the cover plate (1).

5. The battery top cover according to claim 4, characterized in that: The lower insulating member (4) comprises a third protruding portion (41), and the third protruding portion (41) protrudes from the upper surface of the lower insulating member (4).

6. The battery top cover according to claim 5, characterized in that: The height of the third protrusion (41) is C, wherein 0.05 mm <C<0.2mm。 7. The battery top cover according to claim 1, characterized in that: The battery top cover also includes a pole (5), the cover plate (1) is provided with a third pole hole (11), the pole (5) is passed through the third pole hole (11), the first pole hole (21), and the second pole hole (31), and is connected to the connector (3).

8. The battery top cover according to claim 7, characterized in that: The battery top cover further comprises a sealing ring (6), which is sleeved on the pole (5) and located between the cover plate (1) and the pole (5).

9. The battery top cover according to claim 1, characterized in that: The battery top cover further comprises an explosion-proof structure (7), the cover plate (1) is further provided with an explosion-proof hole (12), and the explosion-proof structure (7) is connected to the cover plate (1) and covers the explosion-proof hole (12).

10. A battery cell, 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 battery top cover is tightly connected to the opening of the shell.

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