A top cover assembly and battery therefor

Abstract

The utility model discloses a top cover assembly, comprising a top cover, a pole end and an insulating member, the top cover having a first surface and a second surface opposite to each other in a thickness direction, the top cover being provided with a pole hole penetrating the first surface and the second surface, and the top cover being provided with a connecting member extending into the pole hole; the pole end comprising a pole body and at least two protrusions arranged on the pole body and extending in an axial direction of the pole body, the protrusions being sleeved on the outer side of the connecting member, and the ends of the protrusions being provided with hooks bent inwardly and overlapped to the surface of the connecting member; the insulating member being passed through the pole hole, and the pole end being passed through the insulating member, so as to insulate the top cover from the pole end; a battery adopting this top cover assembly, the top cover assembly and the battery thereof, the top cover assembly having a simple and stable structure, simple processing and manufacturing, and low cost, and at the same time being able to ensure the capacity, energy density and other performances of the battery.

Description

Technical Field

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

[0002] As an important component of the power battery, the top cover assembly plays the role of sealing, integrated liquid injection port, integrated explosion-proof valve port, and transmitting and conducting current in the battery. The structural design of the top cover assembly has an important impact on the battery's capacity, energy density, electric heat, safety and other performances.

[0003] At present, the design of the top cover assembly usually adopts the pole component to penetrate the top cover sheet, and then the pole-top cover sheet is integrally injected or the pole-external conductive terminal is riveted to fix the top cover assembly on the top cover sheet. The pole connection of the conventionally designed top cover assembly is unstable, and the pole is easy to rotate and shift, which in turn affects the dimensional stability of the pole. At the same time, the pole (or riveted terminal) has many parts, a complex structure, and a high processing and manufacturing cost, which has a significant impact on the battery's capacity, energy density and other performance. Utility Model Content

[0004] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a top cover assembly and a battery thereof, wherein the top cover assembly has a simple and stable structure, is simple to manufacture and has a low cost, while being able to ensure the capacity, energy density and other performance of the battery.

[0005] In order to achieve the above object, the utility model is implemented through the following technical solutions: a top cover assembly and a battery top cover structure thereof, comprising:

[0006] A top cover having a first surface and a second surface opposite to each other in a thickness direction, the top cover being provided with a pole hole penetrating the first surface and the second surface, and the top cover being provided with a connecting piece extending into the pole hole;

[0007] A pole end, comprising a pole body and at least two protrusions arranged on the pole body and extending in the axial direction of the pole body, wherein the protrusions are sleeved on the outside of the connector, and the ends of the protrusions are provided with hooks bent inwardly and overlapped with the surface of the connector; and

[0008] An insulating member is inserted into the pole hole, and the pole end is inserted into the insulating member to insulate the top cover from the pole end.

[0009] Furthermore, a buckle groove corresponding to the hook is formed on the top of the connecting member, and the hook is buckled in the buckle groove.

[0010] Furthermore, an end surface of the hook protrudes from an upper end surface of the insulating member.

[0011] Furthermore, an end surface of the pole body protrudes from a lower end surface of the insulating member.

[0012] Furthermore, the hook and the raised portion are integrally formed.

[0013] Furthermore, an escape groove corresponding to the protrusion is provided on the inner ring of the insulating member, and the protrusion is sealed and clamped in the escape groove.

[0014] Furthermore, the side wall of the insulating member is provided with a through hole connecting the inner cavity with the outside, and the through hole is located between the two connected protrusions, the side wall of the connecting member is provided with a connecting portion, and the connecting portion is laterally inserted into the through hole and fixedly connected to the side wall of the pole hole.

[0015] Furthermore, both ends of the insulating member are respectively provided with an outwardly turned upper flange and a lower flange, and the upper flange and the lower flange are respectively clamped on the upper and lower surfaces of the top cover.

[0016] Furthermore, the surfaces of the pole end, the top cover and the connecting member in contact with the insulating member are all provided with nano-level micropores.

[0017] A battery comprises the top cover assembly as described above.

[0018] Beneficial effects of the utility model:

[0019] The top cover assembly comprises a top cover, a pole end and an insulating member, wherein the top cover has a first surface and a second surface opposite to each other in the thickness direction, the top cover is provided with a pole hole penetrating the first surface and the second surface, and the top cover is provided with a connector extending into the pole hole; the pole end comprises a pole body and at least two protrusions extending along the axial direction of the pole body arranged on the pole body, the protrusions are sleeved on the outside of the connector, and the ends of the protrusions are provided with hooks bent inwardly and overlapped with the surface of the connector; the insulating member is passed through the pole hole, and the pole end is passed through the insulating member to insulate the top cover and the pole end. The battery comprises this top cover assembly.

[0020] The top cover assembly and the battery have simple corresponding parts and components in terms of quantity. By fastening the hook to the end face of the connector, the pole end can be prevented from moving up and down, thereby further improving the dimensional stability of the pole end. The top cover and the connector are integrally formed and fixed, thereby further improving the firmness of the connector. At the same time, they can be integrally formed and processed during processing, thereby improving the processing convenience. The insulating part pole end is penetrated into the insulating part to insulate the top cover and the pole end, and at the same time, the airtightness can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation of the utility model, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0022] Figure 1 A schematic diagram of a top cover assembly provided in one embodiment of the utility model (Figure a is a top view, and Figure b is an AA cross-sectional view;

[0023] Figure 2 A schematic diagram of a pole end in a top cover assembly provided in one embodiment of the utility model;

[0024] Figure 3 for Figure 2 A schematic diagram of an insulating member in a top cover assembly provided by an embodiment of the utility model;

[0025] Figure 4 for Figure 2 A schematic diagram of an insulating member in a top cover assembly provided by an embodiment of the utility model being tightly embraced outside the pole end;

[0026] Figure 5 for Figure 2 Schematic diagram of a top cover in a top cover assembly provided by an embodiment of the utility model

[0027] Reference numerals:

[0028] 1. Top cover; 11. Connecting piece; 111. Buckle groove; 12. Pole hole; 13. Connecting part; 2. Pole end; 21. Pole body; 22. Raised part; 23. Buckle; 3. Insulating piece; 31. Avoidance groove; 32. Perforation; 33. Upper flange; 34. Lower flange. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0030] As an important component of the power battery, the top cover assembly plays the role of sealing, integrated liquid injection port, integrated explosion-proof valve port, and transmitting and conducting current in the battery. The structural design of the top cover assembly has an important impact on the battery's capacity, energy density, electric heat, safety and other performances.

[0031] The pole assembly of the existing top cover assembly is directly inserted into the pole hole of the cover plate, which is easy to cause rotation and other displacement, thereby affecting the dimensional stability of the pole. At the same time, the pole (or riveted terminal) has many parts, a complex structure, and high processing and manufacturing costs, which has a significant impact on the capacity, energy density and other performance of the battery. In order to solve the above problems.

[0032] The utility model provides a top cover assembly, comprising a top cover 1, a pole end 2 and an insulating member 3.

[0033] Please refer to Figure 1-5 Specifically, the top cover 1 has a first surface and a second surface opposite to each other in the thickness direction, the top cover 1 is provided with a pole hole 12 penetrating the first surface and the second surface, and the top cover 1 is provided with a connecting piece 11 extending into the pole hole 12.

[0034] The pole end 2 includes a pole body 21 and at least two protrusions 22 arranged on the pole body 21 and extending in the axial direction of the pole body 21. The protrusions 22 are sleeved on the outside of the connector 11, and the ends of the protrusions 22 are provided with hooks 23 bent inwardly and overlapped with the surface of the connector 11. In specific implementation, it is best to have three protrusions 22 to increase stability and avoid the difficulty of processing due to too many protrusions 22.

[0035] The insulating member 3 is inserted into the pole hole 12 , and the pole end 2 is inserted into the insulating member 3 , so as to insulate the top cover 1 and the pole end 2 .

[0036] During assembly, the pole end 2 is inserted into the accommodating cavity surrounded by the raised portion 22, and then the hook 23 is buckled on the end of the connector 11. The hook 23 is buckled to prevent the pole end 2 from moving up and down. Subsequently, the insulating member 3 is tightly sealed around the pole end 2 and the connector 11. The insulating and sealed connection of the insulating member 3 can further position and fix the pole end 2, further ensure the dimensional stability of the top cover assembly, and at the same time play a sealing role, thereby ensuring the capacity, energy density and other performances of the battery.

[0037] As a preferred embodiment, a buckle groove 111 corresponding to the buckle 23 is formed on the top of the connector 11, and the buckle 23 is buckled in the buckle groove 111. During processing, the buckle 23 is buckled in the buckle groove 111, and the pole end 2 can be prevented from rotating;

[0038] In this embodiment, the end surface of the hook 23 protrudes from the upper end surface of the insulating member 3, which can ensure the conductivity of the hook 23. Similarly, the end surface of the pole body 21 protrudes from the lower end surface of the insulating member 3, which can further improve the conductivity of the pole end 2.

[0039] In a specific implementation, the hook 23 and the protrusion 22 are integrally formed. In a specific implementation, the hook 23 can be formed by bending the top of the protrusion 22. In this way, when the protrusion 22 passes through the pole hole 12, the protrusion 22 is bent outward by pressing or other methods to form the hook 23, which is buckled into the buckle groove 111. This can reduce the number of parts and facilitate installation. Of course, in other embodiments, the hook 23 can be processed and connected with the protrusion 22 by welding or clamping.

[0040] As a preferred embodiment, an escape groove 31 corresponding to the protrusion 22 is provided on the inner ring of the insulating member 3, and the protrusion 22 is sealed and clamped in the escape groove 31. The position limiting of the escape groove 31 can further prevent the pole end 2 from rotating, thereby further improving the dimensional stability of the pole end 2.

[0041] Specifically, the side wall of the insulating member 3 is provided with a through hole 32 connecting the inner cavity with the outside, and the through hole 32 is located between the two connected protrusions 22. The side wall of the connecting member 11 is provided with a connecting portion 13, and the connecting portion 13 is laterally inserted into the through hole 32 and fixedly connected with the side wall of the pole hole 12.

[0042] During production, the connecting member 11 and the top cover 1 can be made of the same material, so they can be integrally formed during processing, further improving processing convenience.

[0043] As a preferred embodiment, both ends of the insulating member 3 are respectively provided with an outwardly turned upper flange 33 and a lower flange 34 , and the upper flange 33 and the lower flange 34 are respectively clamped on the upper and lower surfaces of the top cover 1 .

[0044] By limiting the upper flange 33 and the lower flange 34 , the stability of the insulating member 3 can be further improved, and the airtightness can also be improved.

[0045] During specific processing, the insulating part 3 can be an integrally-molded structure through injection molding, and the insulating part 3 is filled in the gap formed by the pole end 2, the connector 11 and the top cover 1. At the same time, the material of the insulating part 3 can be PFA (Chinese name: perfluoroalkyl compound / soluble polytetrafluoroethylene). The integrally-molded method of injection molding can further improve the sealing performance, thereby reducing the use of sealing rings, thereby simplifying the parts. At the same time, it can avoid the compression of the seals and the rebound of internal stress caused by laser welding or riveting, thereby avoiding the potential danger of airtightness failure.

[0046] In addition, in a specific implementation, nano-level micropores may be provided on the surfaces of the pole end 2, the top cover 1, and the connector 11 that contact the insulating member 3. When the insulating member 3 is integrally formed by injection molding, the nano-level micropores further improve the bonding between the insulating member 3 and the pole end 2, the top cover 1, and the connector 11, and at the same time, further improve the sealing degree.

[0047] In addition, the present application also provides a battery, which includes the above-mentioned top cover assembly. It should be noted that this battery is a cylindrical battery.

[0048] The battery using this top cover assembly is simple and stable, easy to process and manufacture, low cost, and can ensure the battery capacity, energy density and other performance

[0049] The above-mentioned top cover assembly and battery can prevent the pole end 2 from moving up and down and rotating by buckling the hanging buckle 23 in the buckle groove 111; the pole end 2 can be further prevented from rotating by limiting the avoidance groove 31, thereby further improving the dimensional stability of the top cover assembly.

[0050] By forming the top cover 1 and the connecting member 11 as an integral structure, the firmness of the connecting member 11 can be further improved. At the same time, during processing, the stability of the insulating member 3 can be further improved by limiting the upper flange 33 and the lower flange 34, and at the same time, the airtightness can be improved.

[0051] In addition, the insulating part 3 adopts an injection-molded one-piece structure, which can further improve the airtightness, thereby reducing the use of sealing rings and further simplifying the components. In addition, it can avoid the compression of the seals and the rebound of internal stress caused by laser welding or riveting, thereby avoiding the potential danger of airtightness failure.

[0052] In addition, the nano-level micropores can further improve the bonding strength between the pole end 2, the top cover 1, the connecting member 11 and the insulating member 3, and further improve the airtightness.

[0053] By adopting the top cover assembly and the battery, the top cover assembly has a simple and stable structure, is simple to manufacture and process, and has a low cost, while being able to ensure the capacity, energy density and other performances of the battery.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A top cover assembly, characterized in that: include: A top cover having a first surface and a second surface opposite to each other in a thickness direction, the top cover being provided with a pole hole penetrating the first surface and the second surface, and the top cover being provided with a connecting piece extending into the pole hole; A pole end, comprising a pole body and at least two protrusions arranged on the pole body and extending in the axial direction of the pole body, wherein the protrusions are sleeved on the outside of the connector, and the ends of the protrusions are provided with hooks bent inwardly and overlapped with the surface of the connector; and An insulating member is inserted into the pole hole, and the pole end is inserted into the insulating member to insulate the top cover from the pole end.

2. The top cover assembly according to claim 1, characterized in that: A buckle groove corresponding to the hook is formed on the top of the connecting piece, and the hook is buckled in the buckle groove.

3. The top cover assembly according to claim 1, characterized in that: The end surface of the hook protrudes from the upper end surface of the insulating member.

4. The top cover assembly according to claim 1, characterized in that: The end surface of the pole body protrudes from the lower end surface of the insulating member.

5. The top cover assembly according to claim 1 or 2, characterized in that: The hook and the protrusion are integrally formed.

6. The top cover assembly according to claim 1, characterized in that: An escape groove corresponding to the protruding portion is arranged on the inner ring of the insulating member, and the protruding portion is sealed and clamped in the escape groove.

7. The top cover assembly according to claim 1, characterized in that: The side wall of the insulating member is provided with a through hole connecting the inner cavity with the outside, and the through hole is located between the two connected protrusions. The side wall of the connecting member is provided with a connecting portion, and the connecting portion laterally penetrates through the through hole and is fixedly connected to the side wall of the pole hole.

8. The top cover assembly according to claim 1 or 6, characterized in that: The two ends of the insulating member are respectively provided with an outwardly turned upper flange and a lower flange, and the upper flange and the lower flange are respectively clamped on the upper and lower surfaces of the top cover.

9. The top cover assembly according to claim 1, characterized in that: The pole end, the top cover and the surfaces of the connecting member contacting with the insulating member are all provided with nano-level micropores.

10. A battery, characterized in that: Comprising a top cover assembly as described in any one of claims 1-9.

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