Top cover assembly and battery

Abstract

The utility model discloses a top cover assembly and a battery. The top cover assembly comprises a top cover sheet, a pole assembly, a sealing piece, an upper insulating piece, a lower insulating piece, an upper ring and a lower ring, the top cover piece is provided with an upper ring extending towards the center direction of the first pole mounting hole, the side face of the pole assembly is provided with a pressing part protruding outwards, the pressing part is sleeved with the sealing part, the first part of the upper insulating part is connected with the upper surface of the upper ring, and the second connecting part is connected with the side face of the upper ring and the side face of the pole assembly. And the second part is connected with the sealing piece. The upper insulating part is respectively connected with the top cover plate, the pole assembly and the sealing part, so that the pole assembly, the sealing part and the top cover plate are fixed into an integrated structure, the sealing part and the pole assembly are prevented from generating transverse displacement, and the stability and the strength of the whole structure of the top cover assembly are improved. Meanwhile, the contact area of the upper insulating part is increased, and the upper insulating part is prevented from falling off.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery and energy storage battery field more specifically, relate to a top cover subassembly and battery. BACKGROUND

[0002] Lithium battery is widely used in power battery, energy storage battery and other technical field, power battery provides power source for tool, usually provides power for electric car, electric train, electric bicycle, golf cart etc., is the core component of new energy automobile etc. Energy storage battery is often used in household energy storage, solar and wind power generation equipment power station, portable power supply, communication base station and so on, and the storage battery of renewable energy storage energy. The application scene of the two is different, and their performance and design are different.

[0003] Lithium battery includes top cover subassembly, and top cover subassembly generally includes upper plastic part, top cover sheet, lower plastic part, sealing ring, pole post assembly and multiple parts, and the problem of part loosening is prone to occur after top cover subassembly assembly, which leads to poor stability of the overall structure of top cover subassembly.

[0004] Therefore, it is urgent to provide a top cover subassembly and battery capable of improving the stability and strength of the overall structure of the top cover subassembly. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the above-mentioned defects existing in prior art, and provides a top cover subassembly, which comprises:

[0006] A top cover sheet is provided with a first pole post mounting hole;

[0007] An upper ring is arranged at the edge of the first pole post mounting hole;

[0008] A lower ring is arranged below the upper ring, the lower ring is connected with the top cover sheet, and the upper ring, the lower ring and the top cover sheet form a containing cavity;

[0009] A lower insulating part is provided with a second pole post mounting hole, and the lower insulating part abuts against the inner surface of the top cover sheet;

[0010] A pole post assembly penetrates through the first pole post mounting hole and the second pole post mounting hole, the side surface of the pole post assembly is provided with an outwardly protruding pressing part, and the pressing part or part of the pressing part is contained in the containing cavity;

[0011] A sealing part is sleeved on the outer surface of the pole post assembly, and the sealing part is contained in the containing cavity; and

[0012] An upper insulating member is arranged on the outer surface of the top cover sheet, and is located between the top cover sheet and the pole assembly.

[0013] The utility model discloses still a kind of battery, including the top cover assembly of above.

[0014] Implement the utility model embodiment, with following beneficial effects:

[0015] The utility model discloses a top cover sheet is provided with upper ring and lower ring, and the sealing element and the compression part of pole assembly between the two are extruded together, so that the stability and strength of the overall structure of top cover assembly are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0017] Among them:

[0018] Figure 1 A schematic view of the top cover assembly provided by the utility model is shown in the figure;

[0019] Figure 2 For Figure 1 A sectional view of the utility model in A-A' direction;

[0020] Figure 3 Another schematic view of the top cover assembly provided by the utility model is shown in the figure;

[0021] Figure 4 Another schematic view of the top cover assembly provided by the utility model is shown in the figure;

[0022] Figure 5 Another schematic view of the top cover assembly provided by the utility model is shown in the figure;

[0023] Figure 6 Another schematic view of the top cover assembly provided by the utility model is shown in the figure.

[0024] 1, top cover sheet, 11, upper ring, 2, pole assembly, 21, compression part, 22, inclined side wall, 3, sealing element, 31, first sealing part, 32, second sealing part, 33, third sealing part, 4, upper insulating member, 41, first part, 42, second part, 421, first section, 422, second section, 5, lower insulating member, 51, clamping part, 6, lower ring, 71, first protruding part, 72, first recessed part, 73, second protruding part, 74, second recessed part. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be apparently and completely described in connection with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.

[0026] Referring to Figure 1 , Figure 2 The utility model discloses a top cap assembly, including top cap sheet 1, pole assembly 2, sealing element 3, upper insulating element 4, lower insulating element 5, upper ring 11, lower ring 6.

[0027] Top cap sheet 1 is equipped with first pole mounting hole, and upper ring 11 is arranged at the edge of first pole mounting hole, and upper ring 11 extends to the center direction of first pole mounting hole. Lower ring 6 is located below upper ring 11, and lower ring 6 is at least partially located directly below upper ring 11, and lower ring 6 is connected with top cap sheet 1, and upper ring 11, lower ring 6 and top cap sheet 1 form a containing cavity. Lower insulating element 5 is equipped with second pole mounting hole, and lower insulating element 5 abuts with the inner surface of top cap sheet 1. Pole assembly 2 penetrates first pole mounting hole and second pole mounting hole, and the side surface of pole assembly 2 is provided with outwardly protruding press-fit portion 21, and press-fit portion 21 or part of press-fit portion 21 is contained in the containing cavity. Sealing element 3 is sleeved on the outside of pole assembly 2, and sealing element 3 is contained in the containing cavity. Upper insulating element 4 is arranged on the outside surface of top cap sheet 1, and upper insulating element 4 is located between top cap sheet 1 and pole assembly 2 to avoid short circuit caused by the contact between top cap sheet 1 and pole assembly 2.

[0028] The above embodiment, by setting upper ring 11 and lower ring 6, jointly extruding the sealing element 3 and the press-fit portion 21 of pole assembly 2 located between the two, improve the stability and strength of the overall structure of top cap assembly.

[0029] Further, upper insulating element 4 includes first part 41 and second part 42, first part 41 is located on the outer surface of top cap sheet 1, and second part 42 is located in the gap between the side wall of containing cavity and the side wall of pole assembly 2, and second part 42 abuts with sealing element 3. Second part 42 further provides the axial direction thrust of sealing element 3, increases the compression amount of sealing element 3, and enhances the stability and sealing property of top cap assembly.

[0030] In a specific embodiment, referring to Figures 2-6 , sealing element 3 includes first sealing part 31, and first sealing part 31 is located between press-fit portion 21 and lower ring 6.

[0031] Further, the surface of the first sealing part 31 facing the lower ring 6, or the surface of the lower ring 6 facing the first sealing part 31 is provided with a first protrusion 71. The first protrusion 71 further increases the compression amount of the sealing ring in the axial direction, improves the stability of the pole assembly, and avoids displacement of the pole assembly in the lateral and longitudinal directions.

[0032] Further, the surface of the lower ring 6 facing the first sealing part 31, or the surface of the first sealing part 31 facing the lower ring 6 is provided with a first recess 72 engaged with the first protrusion 71. The first protrusion 71 and the first recess 72 are engaged and connected in a concave-convex manner, which realizes positioning of the sealing member and prevents displacement of the sealing member in the lateral direction.

[0033] For example, referring to Figure 2 , the surface of the lower ring 6 facing the first sealing part 31 is provided with the first protrusion 71, and the surface of the first sealing part 31 facing the lower ring 6 is provided with the first recess 72 engaged with the first protrusion 71.

[0034] Alternatively, the surface of the first sealing part 31 facing the lower ring 6 is provided with the first protrusion 71, and the surface of the lower ring 6 facing the first sealing part 31 is provided with the first recess 72 engaged with the first protrusion 71.

[0035] In a specific embodiment, referring to Figure 2 , the second part 42 includes a first section 421 between the upper ring 11 and the pressing part 21, and a second section 422 between the side wall of the pressing part 21 and the side wall of the first pole mounting hole, and the second section 422 abuts against the first sealing part 31. In this specific embodiment, the sealing member is an O-shaped sealing ring.

[0036] Alternatively, referring to Figure 4 , the second part 42 includes a first section 421 between the upper ring 11 and the pressing part 21, and the sealing member 3 further includes a second sealing part 32 provided between the side wall of the pressing part 21 and the side wall of the first pole mounting hole, and the first section 421 abuts against the second sealing part 32. In this specific embodiment, the cross-sectional shape of the sealing member is L-shaped, and the L-shaped sealing ring is engaged with the pressing part in a stepped manner, which facilitates positioning of the sealing member.

[0037] Alternatively, referring to Figure 5The second part 42 includes a first segment 421 located between the upper ring 11 and the pressing part 21, and a second segment 422 located between the side wall of the pressing part 21 and the side wall of the first pole mounting hole. The seal 3 also includes a second sealing part 32, which is disposed between the side wall of the pressing part 21 and the side wall of the first pole mounting hole. The second segment 422 is connected to the second sealing part 32. In this specific embodiment, the seal has an L-shaped cross-section, and the L-shaped sealing ring and the pressing part form a stepped engagement connection, which facilitates the positioning of the seal.

[0038] In one specific embodiment, reference is made to Figure 3 , Figure 6 The sealing element 3 includes a third sealing part 33, which is located between the upper ring 11 and the pressing part 21, and the third sealing part 33 abuts against the second part 42.

[0039] Furthermore, a second protrusion 73 is provided on the inner surface of the upper ring 11 or on the surface of the third sealing part 33 facing the upper ring 11. A second recess 74 is provided on the surface of the third sealing part 33 facing the upper ring 11 or on the inner surface of the upper ring 11, which engages with the second protrusion 73.

[0040] For example, refer to Figure 3 The inner surface of the upper ring 11 is provided with a second protrusion 73, and the surface of the third sealing part 33 facing the upper ring 11 is provided with a second recess 74 that engages with the second protrusion 73. The second protrusion 73 presses against the third sealing part 33, providing the third sealing part 33 with a greater axial thrust. The engagement of the second recess 74 and the second protrusion 73 facilitates the positioning of the third sealing part 33 and prevents lateral displacement of the third sealing part 33.

[0041] Optionally, the surface of the third sealing part 33 facing the upper ring 11 may be provided with a second protrusion 73, and the inner surface of the upper ring 11 may be provided with a second recess 74 that engages with the second protrusion 73.

[0042] Furthermore, the upper insulating component 4 can be an injection-molded component or a snap-fit ​​component.

[0043] Optionally, when the upper insulating member 4 is a snap-fit ​​component, the second part 42 is a snap-fit ​​portion, which engages with the inner surface of the upper ring 11 and abuts against the third sealing portion 33. This abutment between the snap-fit ​​portion and the third sealing portion 33 further enhances the compression of the third sealing portion 33. When the upper insulating member 4 is a snap-fit ​​component, compared to when it is an injection-molded part, there are fewer assembly steps, shorter assembly time, and assembly is more convenient.

[0044] In one specific embodiment, reference is made to Figure 6The sidewall of the pole post assembly 2 that abuts against the second part 42 is an inclined sidewall 22. The outer diameter of the portion of the inclined sidewall 22 closer to the lower insulating member 5 is larger than the outer diameter of the portion of the inclined sidewall 22 farther from the lower insulating member 5. The variable diameter pole post assembly can limit the axial displacement of the pole post assembly and improve the stability of the top cover assembly.

[0045] In one specific embodiment, reference is made to Figure 4 , Figure 6 The lower insulating member 5 is provided with a second pole mounting hole, and the edge of the second pole mounting hole is provided with a snap-fit ​​portion 51 that bends towards the top cover plate 1. The snap-fit ​​portion 51 is used to limit the sealing member 3, for example... Figure 4 The middle locking part 51 limits the first sealing part 31.

[0046] The lower ring 6 can be an insulating component or a welded ring. When the lower ring 6 is a welded ring, refer to... Figure 4 , Figure 6 The snap-fit ​​part 51 is located between the lower ring 6 and the pole assembly 2, and also serves as insulation.

[0047] Furthermore, referring to Figure 4 , Figure 6 The end of the snap-fit ​​part 51 is also provided with a snap-fit ​​connector, which snaps onto the lower ring 6. This achieves a snap-fit ​​connection between the lower insulating component 5 and the lower ring 6, making the assembly of the lower insulating component 5 more convenient.

[0048] refer to Figure 2 In this embodiment, the structure designed to prevent the upper insulating part 4 from falling off the pole assembly 2 is eliminated. The anti-falling effect is achieved by utilizing the structure of the top cover plate itself. A step and chamfer are provided at the contact position between the top cover plate 1 and the sealing ring 3 to provide space for the compression of the sealing ring 3, while expanding the effective range and effect of the sealing ring 3.

[0049] Figure 2 The assembly method of the structure shown includes: 1) connecting the pole assembly 2 and the top cover plate 1 through the adhesive coating of the upper insulating component 4; 2) assembling the sealing component 3; 3) making the lower ring 6 of the welding ring, so that the lower ring 6 is welded to the inner surface of the top cover plate 1; 4) fixing the lower insulating component 5 to the top cover plate 1 by heat fusion. Figure 2 The assembly process for the top cover assembly shown is shorter, and the structure is more stable and stronger.

[0050] Figure 3 The assembly method of the structure shown includes: 1) assembling the sealing ring 3 with the top cover plate 1; 2) connecting the pole post assembly 2 and the top cover plate 1 with adhesive through the upper insulating part 4; 3) forming the lower ring 6 of the insulating part; 4) fixing the lower insulating part 5 to the top cover plate 1 by heat fusion.

[0051] As the structural design is optimized, the number of small parts increases, reducing the ease of assembly. Furthermore, the top cover with its raised bulge structure requires multiple stamping processes, making the process cumbersome. To improve assembly flexibility and simplify the process, modular assembly is proposed, such as... Figure 4 As shown. In this embodiment, the upper ring 11 and the top cover plate 1 are separated into a single part, and the upper ring 11 is welded and fixed to the top cover plate 1 by the lower ring 6 of the welding ring. The upper insulating part 4 adopts a snap-fit ​​part combined with the insulating part (including the first segment 421 and the second segment 422) and the lower insulating part 5 also adopts a snap-fit ​​part to achieve modular assembly.

[0052] refer to Figure 5 In this embodiment, the lower ring 6 is a welded ring, and the L-shaped seal 3 is engaged with the pressing part 21. This not only prevents the seal 3 from falling off, but also improves the sealing performance. At the same time, the L-shaped seal also increases the creepage distance between the pole assembly and the top cover plate 1, thus improving product safety.

[0053] Figure 5 The assembly method of the structure shown includes: 1) connecting the pole assembly 2 and the top cover plate 1 through the adhesive coating of the upper insulating part 4; 2) assembling the sealing part 3; 3) welding the lower ring 6 of the welding ring to the top cover plate 1; 4) heat-melting the lower insulating part 5 to the top cover plate 1.

[0054] refer to Figure 6 In this embodiment, the upper insulating component 4 is fabricated as a separate plastic part, and the top cover plate 1, the upper insulating component 4, and the electrode assembly are fixed together by assembly. For ease of installation, the sidewall of the electrode assembly is inclined, eliminating the need for a structure designed to prevent the upper insulating component 4 from detaching from the electrode; instead, the anti-detachment effect is achieved through the inherent structure of the upper insulating component 4 and the top cover plate 1. The lower insulating component 5 is provided with an inverted snap-fit ​​structure, replacing the heat-fusion fixing process, thus fixing the lower insulating component 5 to the top cover plate 1.

[0055] In this embodiment, the sealing element 3 is disposed between the upper ring 11 and the pressing part, the lower ring 6 is a welding ring, and an L-shaped insulating element 73 is disposed between the lower ring 6 and the pressing part 21 to prevent short circuit between the pole assembly 2 and the top cover plate 1 or the welding ring 6.

[0056] Figure 6 The assembly method of the structure shown is as follows: 1) Assemble the upper insulating component 4 and the top cover plate 1; 2) Assemble the sealing component 3; 3) Assemble the pole assembly 2; 4) Assemble the insulating component 73; 5) Weld the lower ring 6 and the top cover plate 1; 6) Assemble and fix the lower insulating component 5.

[0057] This utility model also discloses a battery, including the top cover assembly of any one of the above embodiments.

[0058] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A top cover assembly, characterized in that, include: Top cover plate, wherein the top cover plate is provided with a first pole mounting hole; An upper ring is disposed at the edge of the first pole post mounting hole; The lower ring is located below the upper ring and is connected to the top cover plate. The upper ring, the lower ring, and the top cover plate form a receiving cavity. The lower insulating component is provided with a second pole mounting hole, and the lower insulating component abuts against the inner surface of the top cover plate; The electrode assembly passes through the first electrode mounting hole and the second electrode mounting hole, and the side of the electrode assembly is provided with an outwardly protruding pressing part, and the pressing part or part of the pressing part is accommodated in the receiving cavity; A sealing element, wherein the sealing element is sleeved outside the pole assembly and is accommodated within the receiving cavity; as well as An upper insulating member is disposed on the outer surface of the top cover plate and is located between the top cover plate and the pole assembly.

2. The top cover assembly according to claim 1, characterized in that, The upper insulating member includes a first part and a second part. The first part is located on the outer surface of the top cover plate, and the second part is located in the gap between the side wall of the receiving cavity and the side wall of the pole assembly. The second part abuts against the sealing member.

3. The top cover assembly according to claim 2, characterized in that, The seal includes a first sealing portion located between the pressing portion and the lower ring.

4. The top cover assembly according to claim 3, characterized in that, The surface of the first sealing portion facing the lower ring, or the surface of the lower ring facing the first sealing portion, is provided with a first protrusion.

5. The top cover assembly according to claim 4, characterized in that, The surface of the lower ring facing the first sealing part, or the surface of the first sealing part facing the lower ring, is provided with a first recess that engages with the first protrusion.

6. The top cover assembly according to claim 3, characterized in that, The second part includes a first section located between the upper ring and the pressing part, and a second section located between the side wall of the pressing part and the side wall of the first pole mounting hole, the second section abutting against the first sealing part; Alternatively, the second part includes a first section located between the upper ring and the pressing part, and the seal further includes a second sealing part, which is disposed between the side wall of the pressing part and the side wall of the first pole mounting hole, and the first section abuts against the second sealing part; Alternatively, the second part includes a first section located between the upper ring and the pressing part and a second section located between the side wall of the pressing part and the side wall of the first pole mounting hole. The seal also includes a second sealing part, which is disposed between the side wall of the pressing part and the side wall of the first pole mounting hole, and the second section abuts against the second sealing part.

7. The top cover assembly according to claim 2, 4 or 5, characterized in that, The seal includes a third sealing portion located between the upper ring and the pressing portion.

8. The top cover assembly according to claim 7, characterized in that, The inner surface of the upper ring or the surface of the third sealing part facing the upper ring is provided with a second protrusion.

9. The top cover assembly according to claim 8, characterized in that, The surface of the third sealing part facing the upper ring or the inner surface of the upper ring is provided with a second recess that engages with the second protrusion.

10. The top cover assembly according to claim 1, characterized in that, The upper insulating component is an injection-molded component or a snap-fit ​​component.

11. The top cover assembly according to claim 7, characterized in that, When the upper insulating member is a snap-fit ​​member, the second part is a snap-fit ​​part, which engages with the inner surface of the upper ring and abuts against the third sealing part.

12. The top cover assembly according to claim 1, characterized in that, The sidewall of the pole assembly that abuts against the upper insulator is an inclined sidewall, and the outer diameter of the portion of the inclined sidewall closer to the lower insulator is larger than the outer diameter of the portion of the inclined sidewall farther from the lower insulator.

13. The top cover assembly according to claim 1, characterized in that, The edge of the second pole mounting hole is provided with a snap-fit ​​portion that bends toward the top cover plate.

14. The top cover assembly according to claim 13, characterized in that, The snap-fit ​​portion is located between the lower ring and the pole assembly.

15. The top cover assembly according to claim 14, characterized in that, The end of the snap-fit ​​part is also provided with a snap-fit ​​connector, which snaps onto the lower ring.

16. A battery, characterized in that, Includes the top cover assembly as described in any one of claims 1 to 15.

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