Battery top cover and single battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover and a single battery. The battery top cover comprises a top cover sheet and a lower insulating part. The top cover plate comprises a first pole hole and a limiting groove, and the limiting groove is formed in the lower surface of the top cover plate and surrounds the periphery of the first pole hole. The lower insulating part abuts against the lower portion of the top cover piece, the lower insulating part comprises a second pole hole, a limiting protrusion and a positioning block, the second pole hole is correspondingly formed in the first pole hole, the limiting protrusion is arranged on the upper surface of the lower insulating part in a protruding mode and surrounds the periphery of the second pole hole, and the positioning block is connected to the side wall of the limiting protrusion; the limiting protrusion and the positioning block extend into the limiting groove, and the positioning block abuts against the side wall of the limiting groove. The battery top cover can prevent the relative rotation between the lower insulating part and the top cover sheet, ensures the structural stability of the battery top cover, improves the yield when the battery top cover is assembled, and saves the production cost.

Description

Technical Field

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

[0002] The top cover of a power battery is an important part of a lithium-ion battery. Currently, the top cover of a power battery mainly includes a cover plate, a pole column assembled on the cover plate, a lower insulating part for insulating and sealing the pole column from the lower side (the side close to the power battery) of the cover plate, an upper insulating part for insulating and sealing the pole column from the upper side (the side far from the power battery) of the cover plate, and a sealing ring for insulating and sealing the pole column from the pole column mounting hole on the cover plate, etc.

[0003] In the prior art, there is no corresponding limiting structure provided between the cover plate piece and the lower insulating part of the battery top cover, and the anti-torsion performance of the top cover is relatively low, which affects the structural reliability of the top cover and is prone to assembly misalignment problems. Once the cover plate piece and the lower insulating part are misaligned, it will not only cause the mold to crush the lower plastic during encapsulation, resulting in an increase in production costs, but also the lower plastic will interfere with the battery housing, affecting the assembly efficiency of the battery top cover and the housing. In addition, the liquid injection holes of the lower plastic and the cover plate piece are misaligned, resulting in uneven liquid injection inside the battery, thereby affecting the service performance and service life of the battery.

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

[0005] An object of the utility model is to provide a battery top cover that can prevent relative rotation between the lower insulating part and the top cover piece, and ensure the firm structure of the battery top cover.

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

[0007] Provide a battery top cover, including:

[0008] A top cover piece, the top cover piece includes a first pole column hole and a limiting groove, the limiting groove is arranged on the lower surface of the top cover piece, and the limiting groove is arranged around the outer periphery of the first pole column hole;

[0009] A lower insulating part, the lower insulating part abuts against the lower side of the top cover piece, the lower insulating part includes a second pole column hole, a limiting protrusion and a positioning block, the second pole column hole is correspondingly arranged with the first pole column hole, the limiting protrusion protrudes from the upper surface of the lower insulating part, the limiting protrusion is arranged around the outer periphery of the second pole column hole, the positioning block is connected to the side wall of the limiting protrusion, the limiting protrusion and the positioning block extend into the limiting groove, and the positioning block abuts against the side wall of the limiting groove.

[0010] As an alternative solution for the battery top cover, a plurality of positioning blocks are provided, and the plurality of positioning blocks are evenly distributed circumferentially along the limiting protrusion.

[0011] As an alternative solution for the battery top cover, the size of the positioning block is 4mm * 0.5mm * 0.2mm.

[0012] As an alternative solution for the battery top cover, the battery top cover further includes a pole post, and the pole post passes through the first pole post hole and the second pole post hole.

[0013] As an alternative solution for the battery top cover, the battery top cover further includes an upper insulating member, the upper insulating member is located above the top cover sheet, the upper insulating member is provided with a third pole post hole, the pole post passes through the third pole post hole, and the upper insulating member is insulated between the pole post and the top cover sheet.

[0014] As an alternative solution for the battery top cover, the top cover sheet further includes a protruding portion, the protruding portion protrudes from the upper surface of the top cover sheet, and the upper insulating member further includes a groove, and the protruding portion extends into the groove.

[0015] As an alternative solution for the battery top cover, the battery top cover further includes a sealing ring, and the sealing ring is sleeved on the pole post and is located between the lower insulating member and the pole post.

[0016] As an alternative solution for the battery top cover, the battery top cover further includes a liquid injection hole, the liquid injection hole includes a first liquid injection hole and a second liquid injection hole, the first liquid injection hole penetrates the top cover sheet, the second liquid injection hole penetrates the lower insulating member, and the first liquid injection hole and the second liquid injection hole are correspondingly arranged.

[0017] As an alternative solution for the battery top cover, the top cover sheet is further provided with an explosion-proof hole, and the battery top cover further includes an explosion-proof sheet, and the explosion-proof sheet is connected to the top cover sheet and covers the explosion-proof hole.

[0018] Another object of the present invention is to provide a single cell, the battery top cover structure of which is stable, and can ensure the use performance and service life of the single cell.

[0019] To achieve this purpose, the present invention adopts the following technical solutions:

[0020] Provide a single cell, including an electric core, a housing and the above-mentioned battery top cover, the electric core is arranged in the housing, and the battery top cover is hermetically connected to the opening of the housing.

[0021] The beneficial effects of the present invention:

[0022] The utility model provides a battery top cover, which includes a top cover sheet and a lower insulating member. The lower insulating member abuts against the lower part of the top cover sheet. A limiting groove is arranged on the lower surface of the top cover sheet around the outer periphery of the first pole column hole. A limiting protrusion is arranged on the upper surface of the lower insulating member around the second pole column hole. The limiting protrusion extends into the limiting groove to realize the positioning between the lower insulating member and the top cover sheet. A positioning block is connected to the side wall of the limiting protrusion and can penetrate into the limiting groove together with the limiting protrusion and abut against the side wall of the limiting groove, so as to be limited in the gap between the side wall of the limiting protrusion and the side wall of the limiting groove, prevent the limiting protrusion from rotating in the limiting groove, and further prevent relative rotation between the lower insulating member and the top cover sheet, ensure the structural stability of the battery top cover, reduce the probability of damaging the lower insulating member during encapsulation due to the offset of the lower insulating member, improve the yield rate when assembling the battery top cover, and save production costs.

[0023] The utility model also provides a single cell, which includes a battery core, a housing and the above-mentioned battery top cover. The battery top cover has a stable structure, can avoid relative rotation between the lower insulating member and the top cover sheet, reduce interference damage caused by the offset of the lower insulating member and the housing, improve the yield rate of assembling the single cell, ensure product quality, and reduce production costs. Description of the Drawings

[0024] Figure 1 is a partial structural schematic diagram of the lower insulating member of the battery top cover provided by the utility model;

[0025] Figure 2 is a structural schematic diagram of the top cover sheet of the battery top cover provided by the utility model;

[0026] Figure 3 is a partial cross-sectional view of the battery top cover provided by the utility model;

[0027] Figure 4 is an exploded view of the battery top cover provided by the utility model.

[0028] In the figure:

[0029] 1. Top cover sheet; 11. First pole column hole; 12. Limiting groove; 13. Protruding part; 14. Explosion-proof hole;

[0030] 2. Lower insulating member; 21. Second pole column hole; 22. Limiting protrusion; 23. Positioning block;

[0031] 3. Pole column; 31. First part; 32. Second part; 33. Penetrating part;

[0032] 4. Upper insulating member; 41. Third pole column hole; 42. Groove;

[0033] 5. Sealing ring;

[0034] 6. Liquid injection hole; 61. First liquid injection hole; 62. Second liquid injection hole;

[0035] 7. Explosion-proof film. Specific embodiments

[0036] 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 for explaining the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0037] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of 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.

[0038] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0039] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0040] Such as Figures 1 to 4As shown, the battery top cover of this embodiment includes a top cover sheet 1 and a lower insulating member 2. The top cover sheet 1 includes a first pole hole 11 and a limiting groove 12. The limiting groove 12 is arranged on the lower surface of the top cover sheet 1, and the limiting groove 12 is arranged around the periphery of the first pole hole 11. The lower insulating member 2 abuts against the bottom of the top cover sheet 1. The lower insulating member 2 includes a second pole hole 21, a limiting protrusion 22 and a positioning block 23. The second pole hole 21 is correspondingly arranged in the first pole hole 11. The limiting protrusion 22 is convexly arranged on the upper surface of the lower insulating member 2. The limiting protrusion 22 is arranged around the periphery of the second pole hole 21. The positioning block 23 is connected to the side wall of the limiting protrusion 22. The limiting protrusion 22 and the positioning block 23 extend into the limiting groove 12, and the positioning block 23 abuts against the side wall of the limiting groove 12.

[0041] Based on the above design, the lower insulating member 2 is abutted against the bottom of the top cover sheet 1, and a limiting groove 12 is provided on the lower surface of the top cover sheet 1 around the periphery of the first pole hole 11, and a limiting protrusion 22 is provided on the upper surface of the lower insulating member 2 around the second pole hole 21, and the limiting protrusion 22 extends into the limiting groove 12 to achieve positioning between the lower insulating member 2 and the top cover sheet 1. The positioning block 23 is connected to the side wall of the limiting protrusion 22, and can penetrate into the limiting groove 12 together with the limiting protrusion 22 and abut against the side wall of the limiting groove 12, so as to be limited in the gap between the side wall of the limiting protrusion 22 and the side wall of the limiting groove 12, preventing the limiting protrusion 22 from rotating in the limiting groove 12, and then preventing the lower insulating member 2 from rotating relative to the top cover sheet 1, thereby ensuring the structural stability of the battery top cover, reducing the probability of the lower insulating member 2 being crushed during the encapsulation due to the deviation of the lower insulating member 2, improving the yield rate when assembling the battery top cover, and saving production costs.

[0042] Optionally, a plurality of positioning blocks 23 are provided, and the plurality of positioning blocks 23 are evenly distributed along the circumference of the limiting protrusion 22. In the present embodiment, the limiting groove 12 is a square groove structure, the limiting protrusion 22 is correspondingly set as a square protrusion, and four positioning blocks 23 are provided, and the four positioning blocks are respectively provided on the four sides of the direction protrusion to ensure the stability of the limiting structure. In some other embodiments, the limiting groove 12 and the limiting protrusion 22 can also be circular or other polygonal structures, and the positioning blocks 23 can also be provided with three, six, etc., which can be adjusted according to actual needs.

[0043] Preferably, the size of the positioning block 23 is 4mm*0.5mm*0.2mm, which ensures that the positioning block 23 can smoothly enter the limiting groove 12, and can also ensure that the positioning block 23 abuts against the side wall of the limiting groove 12, reducing the shaking of the lower insulating member 2 relative to the top cover sheet 1, and ensuring the structural stability of the battery top cover. Optionally, the top cover sheet 1 can also be provided with a positioning groove (not shown in the figure), the positioning groove is provided on the side wall of the limiting groove 12, and the positioning block 23 can be limited in the positioning groove, further ensuring the limiting effect of the positioning block 23.

[0044] Further, the battery top cover further includes a terminal post 3, and the terminal post 3 passes through the first terminal post hole 11 and the second terminal post hole 21. Specifically, the terminal post 3 includes a first part 31, a second part 32, and a penetrating part 33. The first part 31 abuts against the upper side of the top cover sheet 1, the second part 32 abuts against the lower side of the lower insulating member 2, and the penetrating part 33 passes through the first terminal post hole 11 and the second terminal post hole 21 and is connected between the first part 31 and the second part 32, ensuring a stable connection between the terminal post 3 and the top cover sheet 1.

[0045] Further, the battery top cover further includes a sealing ring 5, and the sealing ring 5 is sleeved on the terminal post 3 and is located between the lower insulating member 2 and the terminal post 3, ensuring the seal between the terminal post 3 and the lower insulating member 2 and preventing the electrolyte in the battery cell from leaking from the battery top cover.

[0046] Further, the battery top cover further includes an upper insulating member 4, and the upper insulating member 4 is located above the top cover sheet 1. The upper insulating member 4 is provided with a third terminal post hole 41, and the terminal post 3 passes through the third terminal post hole 41. The upper insulating member 4 is insulated between the terminal post 3 and the top cover sheet 1, ensuring the insulation between the terminal post 3 and the top cover sheet 1.

[0047] Optionally, the top cover sheet 1 further includes a protruding portion 13, and the protruding portion 13 protrudes from the upper surface of the top cover sheet 1. The upper insulating member 4 further includes a groove 42, and the protruding portion 13 extends into the groove 42, realizing the positioning between the upper insulating member 4 and the top cover sheet 1, facilitating the installation of the upper insulating member 4, and at the same time preventing relative rotation between the upper insulating member 4 and the top cover sheet 1, improving the structural strength of the battery top cover. In some embodiments, the protruding portion 13 may be provided as a columnar protrusion, and a plurality of columnar protrusions may be provided. The plurality of columnar protrusions are circumferentially distributed on the outer periphery of the first terminal post hole 11, and a plurality of grooves 42 are also provided and the plurality of grooves 42 are provided in one-to-one correspondence with the protruding portions 13. In some other embodiments, the protruding portion 13 may also be provided as an annular protrusion, and the annular protrusion surrounds the first terminal post hole 11, and the groove 42 is correspondingly provided as an annular groove, realizing the positioning between the upper insulating member 4 and the top cover sheet 1.

[0048] Further, the battery top cover further includes a liquid injection hole 6, and the liquid injection hole 6 includes a first liquid injection hole 61 and a second liquid injection hole 62. The first liquid injection hole 61 penetrates the top cover sheet 1, and the second liquid injection hole 62 penetrates the lower insulating member 2. The first liquid injection hole 61 and the second liquid injection hole 62 are correspondingly provided, and the liquid injection hole 6 is used to inject electrolyte into the battery cell. The battery top cover provided in this embodiment can prevent rotation between the lower insulating member 2 and the top cover sheet 1, so that the first liquid injection hole 61 and the second liquid injection hole 62 can be aligned, ensuring uniform liquid injection during liquid injection and ensuring the use performance of the battery.

[0049] Further, the top cover sheet 1 is further provided with an explosion-proof hole 14, and the battery top cover further includes an explosion-proof sheet 7. The explosion-proof sheet 7 is connected to the top cover sheet 1 and covers the explosion-proof hole 14. When the internal pressure of the single battery is too high, the single battery can release the pressure through the explosion-proof hole 14 and the explosion-proof sheet 7 to ensure the safety of the single battery.

[0050] The present utility model also provides a single battery, which includes an electric core, a housing, and the above-mentioned battery top cover. The electric core is arranged in the housing, and the battery top cover is sealingly connected to the opening of the housing. The structure of the battery top cover is stable, which can prevent the lower insulating member 2 from rotating relative to the top cover sheet 1, reduce the offset of the lower insulating member 2 and the interference damage with the housing during the assembly of the single battery, improve the yield rate of assembling the single battery, ensure the product quality, and reduce the production cost.

[0051] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly explaining the present utility model, rather than limiting the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A battery top cover, characterized in that: include: A top cover sheet (1), the top cover sheet (1) comprising a first pole hole (11) and a limiting groove (12), the limiting groove (12) being arranged on the lower surface of the top cover sheet (1), and the limiting groove (12) being arranged around the outer periphery of the first pole hole (11); A lower insulating member (2), the lower insulating member (2) abuts against the bottom of the top cover sheet (1), the lower insulating member (2) comprises a second pole hole (21), a limiting protrusion (22) and a positioning block (23), the second pole hole (21) is arranged correspondingly to the first pole hole (11), the limiting protrusion (22) is protruding from the upper surface of the lower insulating member (2), the limiting protrusion (22) is arranged around the outer periphery of the second pole hole (21), the positioning block (23) is connected to the side wall of the limiting protrusion (22), the limiting protrusion (22) and the positioning block (23) extend into the limiting groove (12), and the positioning block (23) abuts against the side wall of the limiting groove (12).

2. The battery top cover according to claim 1, characterized in that: A plurality of the positioning blocks (23) are provided, and the plurality of the positioning blocks (23) are evenly distributed along the circumference of the limiting protrusion (22).

3. The battery top cover according to claim 1, characterized in that: The size of the positioning block (23) is 4 mm*0.5 mm*0.2 mm.

4. The battery top cover according to claim 1, characterized in that: The battery top cover also includes a pole (3), and the pole (3) is inserted into the first pole hole (11) and the second pole hole (21).

5. The battery top cover according to claim 4, characterized in that: The battery top cover also includes an upper insulating member (4), the upper insulating member (4) is located above the top cover sheet (1), the upper insulating member (4) is provided with a third pole hole (41), the pole (3) is passed through the third pole hole (41), and the upper insulating member (4) is insulated between the pole (3) and the top cover sheet (1).

6. The battery top cover according to claim 5, characterized in that: The top cover sheet (1) further comprises a protrusion (13), wherein the protrusion (13) is protruding from the upper surface of the top cover sheet (1), and the upper insulating member (4) further comprises a groove (42), wherein the protrusion (13) extends into the groove (42).

7. The battery top cover according to claim 4, characterized in that: The battery top cover also includes a sealing ring (5), which is sleeved on the pole (3) and located between the lower insulating member (2) and the pole (3).

8. The battery top cover according to claim 1, characterized in that: The battery top cover also includes a liquid injection hole (6), which includes a first liquid injection hole (61) and a second liquid injection hole (62), the first liquid injection hole (61) passes through the top cover sheet (1), and the second liquid injection hole (62) passes through the lower insulating member (2), and the first liquid injection hole (61) and the second liquid injection hole (62) are arranged correspondingly.

9. The battery top cover according to claim 1, characterized in that: The top cover sheet (1) is also provided with an explosion-proof hole (14), and the battery top cover also includes an explosion-proof sheet (7), wherein the explosion-proof sheet (7) is connected to the top cover sheet (1) and covers the explosion-proof hole (14).

10. A single cell battery, characterized in that: The invention 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 sealed and connected to an opening of the shell.

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