CN219144311U

CN219144311U - Top cover of power battery

Info

Publication number: CN219144311U
Application number: CN202223209167.8U
Authority: CN
Inventors: 谢迪波; 曾志亮; 黄书伟
Original assignee: Zigong Changying Precision Technology Co ltd; Shenzhen Everwin Precision Technology Co Ltd
Current assignee: Zigong Changying Precision Technology Co ltd; Shenzhen Everwin Precision Technology Co Ltd
Priority date: 2022-12-01
Filing date: 2022-12-01
Publication date: 2023-06-06
Anticipated expiration: 2032-12-01

Abstract

The utility model relates to the technical field of batteries, in particular to a top cover of a power battery, which comprises a top cover plate with a first mounting hole, upper plastic arranged on the upper surface of the top cover plate, a pressing block arranged in the upper plastic, a sealing ring sleeved on the periphery of the first mounting hole, lower plastic arranged on the lower surface of the top cover plate and provided with a through hole, and a transfer sheet limited on the lower side of the top cover plate and welded and fixed with the pressing block, wherein the through hole corresponds to the first mounting hole, at least part of the transfer sheet passes through the through hole and the first mounting hole to be attached to the lower surface of the pressing block and welded and fixed, and the sealing ring is clamped between the pressing block and the periphery of the first mounting hole, so that the mounting process is simplified and the cost is reduced.

Description

Top cover of power battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a top cover of a power battery.

Background

With the rapid development of new energy automobiles, the power battery is rapidly increased in demand as a power source of the new energy automobiles, so that the demand of power battery accessories is synchronously increased. The power battery top cover is used as an important part of the power battery, insulation treatment is needed between the top cover plate and the pole, in the prior art, the pole and the top cover plate are electrically isolated in a mode of mounting or forming insulation blocks on the upper surface and the lower surface of the top cover plate, the pole is upwards penetrated into the pressing block and fixed in a riveting mode, and then the rotating sheet is welded and fixed on the bottom surface of the pole so as to be connected to the inside of the battery core. The manufacturing cost of the riveting process is relatively high, and the polar post is generally finished by CNC machining, so the machining cost of the part is also high. The riveting process is at risk of unsealing between the pressing block and the pole, and although the riveting edge is welded to seal the pressing block and the pole, if inaccurate welding or insufficient welding degree occurs, the welding is easy to cause gas leakage and liquid leakage, and meanwhile the welding cost is increased.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides the power battery top cover which is simple in structure and mounting process and stable.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a power battery top cap, its includes the lamina tecti that is equipped with first mounting hole, locates the last plastic of lamina tecti's upper surface, install in briquetting in the last plastic, cover are located first mounting hole peripheral sealing washer, locate lamina tecti lower surface and be equipped with fenestrate lower plastic and limit are located lamina tecti downside and with briquetting welded fastening's adapter, the fenestration corresponds first mounting hole, at least part the adapter passes fenestration and first mounting hole laminating in briquetting lower surface and welded fastening, the sealing washer centre gripping in between briquetting with the first mounting hole periphery.

The adapter piece comprises a base body, a connecting part formed by bending the outer side of the base body and a welding protrusion formed by upwards punching and sinking the base body, and the welding protrusion is welded with the through hole and the pressing block through the first mounting hole.

The top cover plate is provided with a concave mounting groove corresponding to the upper plastic, and the pressing block is arranged in the mounting groove.

Wherein, the periphery of the mounting hole is upwards protruded to form a connecting part, and the sealing ring is sleeved on the connecting part.

The plastic bottom is provided with a second mounting hole with the same size as the sealing ring, and the sealing ring is limited in the second mounting hole.

The lower plastic is provided with at least two buckling ends towards one end of the transfer sheet, the transfer sheet is provided with buckling holes corresponding to the buckling ends, and the transfer sheet is assembled with the buckling ends through the buckling holes.

The lower plastic further comprises a lower plastic bottom plate, and the lower plastic bottom plate is assembled on the lower surface of the rotating sheet after the buckling holes are assembled with the buckling ends.

The adapter piece is formed by integrally stamping thicker metal materials, the welding protrusions upwards penetrate through the first mounting holes and the through holes to be attached to the lower surface of the pressing block, the lower surface of the welding protrusions serves as a welding area, the upper surface of the welding protrusions is welded with the lower surface of the pressing block, and the top surfaces of the welding protrusions do not exceed the upper surface of the sealing ring.

Wherein the edge of the base body exceeds the periphery of the first mounting hole, so that the base body of the welding projection periphery is limited below the top cover plate to tighten the pressing block.

And the top cover plate is further provided with a third mounting hole, a explosion-proof sheet is arranged in the third mounting hole, and a protective film is arranged on the explosion-proof sheet.

The power battery top cover has the beneficial effects that: the power battery top cover is provided with a top cover plate with a first mounting hole, an upper plastic arranged on the upper surface of the top cover plate, a pressing block arranged in the upper plastic, a sealing ring sleeved on the periphery of the first mounting hole, a lower plastic arranged on the lower surface of the top cover plate and provided with a perforation and a switching piece limited on the lower side of the top cover plate and welded and fixed with the pressing block, the perforation corresponds to the first mounting hole, the sealing ring is clamped between the pressing block and the periphery of the first mounting hole, and the stability of the power battery top cover structure is improved by positioning the upper plastic through the sealing ring, and the switching piece passes through the perforation and the first mounting hole to be attached to the lower surface of the pressing block and welded and fixed, so that the mounting procedure is simplified, and the cost is saved.

Drawings

FIG. 1 is a top plan view of the power cell top cover of the present utility model;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a partial exploded view of the top cover of the power cell of the present utility model;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;

the attached drawings are identified:

1-top cover plate; 2-plastic feeding; 3-briquetting; 4-a sealing ring; 5-lower plastic; 6-a transfer sheet; 7-explosion-proof sheets; 8-a protective film; 11-a first mounting hole; 12-mounting grooves; 13-a third mounting hole; 21-a second mounting hole; 41-engagement grooves; 51-perforating; 52-a snap end; 53-lower plastic bottom plate; 54-lower plastic baffles; 55-isolating convex rings; 61-matrix; 62-connecting part; 63-welding the protrusions; 64-snap holes; 111-engagement; 121-bump.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof.

Referring to fig. 1 to 4, the top cover of the power battery of the present utility model includes a top cover plate 1 provided with a first mounting hole 11, an upper plastic 2 disposed on the upper surface of the top cover plate 1, a pressing block 3 mounted in the upper plastic 2, a sealing ring 4 sleeved on the periphery of the first mounting hole 11, a lower plastic 5 disposed on the lower surface of the top cover plate 1 and provided with a through hole 51, and a transfer sheet 6 limited on the lower side of the top cover plate 1 and welded and fixed with the pressing block 3.

Referring to fig. 2 and 4, the adapter plate 6 includes a base 61, a connecting portion 62 formed by bending from the outside of the base 61, and a welding protrusion 63 formed by punching and recessing from the base 61, wherein the welding protrusion 63 passes through the through hole 51 and the first mounting hole 11 and then is released from and welded to the press block 3, and the edge of the base 61 exceeds the periphery of the first mounting hole 11, so that a portion of the base 61 at the periphery of the welding protrusion 63 is limited below the top cover plate 1 to enable the press block 3 to be tightly pulled after being welded to the press block 3, the base 61 is made of a copper alloy or an aluminum alloy, the base 61 is made of a copper alloy or a nickel alloy as a negative electrode of the power battery (not shown), and the positive electrode of the lithium battery is made of an aluminum alloy, and the connecting portion 62 is attached to the outside of the power battery to stabilize the mounting of the top cover of the power battery.

Referring to fig. 2 and 4, the top cover 1 is provided with a concave mounting groove 12 corresponding to the upper plastic 2, the upper plastic 2 is placed in the mounting groove 12, the first mounting hole 11 penetrates through the top cover 11 downwards from the middle of the mounting groove 12, a protrusion 121 is provided on the outer wall of the mounting groove 12 to limit the upper plastic 2, the protrusion 121 is upwardly exposed on the top cover 1, a connecting portion 111 is upwardly protruded from the periphery of the first mounting hole 11, the sealing ring 4 is sleeved on the connecting portion 111, the sealing ring 4 is provided with a connecting groove 41 corresponding to the connecting portion 111, and the connecting groove 41 is sleeved outside the connecting portion 111. In this embodiment, the third mounting hole 13 that is equipped with between the first mounting hole 11 of lamina tecti 1 both sides is installed explosion-proof piece 7, the last protection film 8 that has of explosion-proof piece 7, explosion-proof piece 7 is used for preventing when the power battery internal pressure is too high, break explosion-proof piece pressure release is in order to ensure the security of product, avoids producing violent explosion.

Referring to fig. 2 and 4, the upper plastic 2 clamps the pressing block 3, wherein a second mounting hole 21 having the same outer diameter as the sealing ring 4 is provided at the bottom of the upper plastic 2, the sealing ring 4 is limited in the second mounting hole 21 and clamped between the lower surface of the pressing block 3 and the joint portion 111 of the first mounting hole 11 to achieve sealing, the sealing ring 4 has a certain thickness, when the pressing block is pressed down, the sealing ring 4 is elastically deformed, and the pressing block 3 moves downward, that is, the sealing ring 4 always applies an upward elastic restoring force to the pressing block 3.

Referring to fig. 2, the end of the lower plastic 5 facing the adapter plate 6 is provided with at least two fastening ends 52, the adapter plate 6 is provided with fastening holes 64 corresponding to the fastening ends 52, the adapter plate 6 is pre-fixed by assembling the fastening holes 64 with the fastening ends 52 and can prevent the adapter plate 6 from rotating, wherein the lower plastic 5 further comprises a lower plastic bottom plate 53, the lower plastic bottom plate 53 is assembled on the lower surface of the adapter plate 6 after assembling the fastening holes 64 with the fastening ends 52, and as can be seen from fig. 4, the lower plastic 5 is provided with a lower plastic baffle 54 outside the adapter plate and covers the substrate 61 assembled with the top cover plate 1 together with the lower plastic bottom plate 53. The perforated edge of the lower plastic 5 protrudes upwards to form an isolation convex ring 55, and the isolation convex ring 55 enters the first mounting hole 11 upwards and is attached to the inner wall surface of the first mounting hole 11, so as to electrically isolate the top cover plate 1 from the welding protrusion 63. In an embodiment, the top end of the isolating convex ring 55 is flush with the top surface of the engaging portion 111, and the engaging groove 41 of the sealing ring 4 is buckled on the top surfaces of the engaging portion 111 and the isolating convex ring 55 to achieve better electrical isolation.

In a preferred embodiment, referring to fig. 1 to 4, the adapter plate 6 is integrally stamped from a thicker aluminum alloy material or a copper alloy, the welding protrusion 63 passes through the first mounting hole 11 and the through hole 51 upwards to be attached to the lower surface of the pressing block 3, the lower surface of the welding protrusion 63 is used as a welding area to weld the upper surface of the welding protrusion 63 and the lower surface of the pressing block 3 together, and the top surface of the welding protrusion 63 does not exceed the upper surface of the sealing ring 4. It will be appreciated that in other embodiments, the upper plastic 2 and the lower plastic 5 are integrally formed, i.e. by in-mold injection molding around the first mounting hole 11 of the top cover plate 1, and the upper plastic 2 and the lower plastic 5 are integrally connected through the first mounting hole 11. At this time, the welding protrusion 63 of the adapter piece 6 extends upwards into the first mounting hole 11 and is bonded and welded with the lower surface of the pressing block 3, and the periphery of the adapter piece 6 extrudes the lower plastic 5 upwards to enable the lower plastic 5 to elastically deform upwards to realize sealing. Specifically, the edges of the pressing block 3 and the adapting piece 6 squeeze the upper plastic 2 and the lower plastic 5, so that the plastic length in the first mounting hole 11 is shortened, and an interference fit is generated between the welding protrusion 63 and the inner wall surface of the first mounting hole 11 to realize sealing. It should be noted that, the plastic in this embodiment is made of a material having a certain elasticity.

In this embodiment, please refer to fig. 1 to 4, the top cover 1 is assembled with the lower plastic 5, then the welding protrusion 63 of the adapter plate 6 passes through the first mounting hole 11 and the through hole 51, and the adapter plate 6 is assembled with the fastening end 52 through the fastening hole 64, then the sealing ring 4 is sleeved on the connecting portion 111, the upper plastic 2 is placed in the mounting groove 12, the second mounting hole 21 of the upper plastic 2 is aligned with the first mounting hole 11, the sealing ring is limited in the second mounting hole 21, the pressing block 3 is assembled in the upper plastic 2, then the welding protrusion 63 is abutted against and welded with the lower surface of the pressing block 3, and then the lower plastic bottom plate 53 is assembled on the lower surface of the adapter plate 6, so as to complete the mounting process.

When the adapter piece 6 and the pressing block 3 are welded and fixed together, the pressing block 3 always presses the sealing ring 4 downwards and enables the sealing ring 4 to elastically deform. I.e. the press 3 needs to be pressed down to fit the surface of the welding protrusion 63 during welding.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples only represent preferred embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. The utility model provides a power battery top cap, its characterized in that, including the lamina tecti that is equipped with first mounting hole, locate the last plastic of lamina tecti's upper surface, install in last plastic in the briquetting, cover are located first mounting hole peripheral sealing washer, locate lamina tecti lower surface and be equipped with fenestrate lower plastic and limit are located lamina tecti downside and with briquetting welded fastening's adapter, the fenestration corresponds first mounting hole, at least part the adapter passes fenestration and first mounting hole laminating in briquetting lower surface and welded fastening, the sealing washer centre gripping in between briquetting with the first mounting hole periphery.

2. The power battery top cover according to claim 1, wherein the adapter piece comprises a base body, a connecting portion formed by bending from the outer side of the base body, and a welding protrusion formed by punching and sinking upward from the base body, and the welding protrusion is welded with the through hole and the pressing block through the first mounting hole.

3. The power battery top cover according to claim 1, wherein the top cover plate is provided with a concave mounting groove corresponding to the upper plastic, and the pressing block is arranged in the mounting groove.

4. The power battery top cover according to claim 1, wherein the first mounting hole is formed with an engagement portion protruding upward from a peripheral edge thereof, and the sealing ring is sleeved on the engagement portion.

5. The power cell top cover of claim 1, wherein the upper plastic bottom is provided with a second mounting hole of the same size as the sealing ring, and the sealing ring is limited in the second mounting hole.

6. The power battery top cover according to claim 1, wherein the lower plastic is provided with at least two fastening ends towards one end of the adapting piece, the adapting piece is provided with fastening holes corresponding to the fastening ends, and the adapting piece is assembled with the fastening ends through the fastening holes.

7. The power cell top cover of claim 6, wherein the lower plastic further comprises a lower plastic bottom plate, the lower plastic bottom plate being on a lower surface of the adapter plate after the snap holes are assembled with the snap ends.

8. The power battery top cover according to claim 2, wherein the adapter piece is integrally punched by thicker metal materials, the welding protrusion passes through the first mounting hole and the through hole upwards to be attached to the lower surface of the pressing block, the lower surface of the welding protrusion is used as a welding area to weld the upper surface of the welding protrusion and the lower surface of the pressing block together, and the top surface of the welding protrusion does not exceed the upper surface of the sealing ring.

9. The power cell top cover of claim 2, wherein an edge of the base exceeds a periphery of the first mounting hole such that the base of the welding projection periphery is restrained under the top cover plate to tighten the press block.

10. The power battery top cover according to claim 1, wherein a third mounting hole is further formed in the top cover plate, a bursting disc is arranged in the third mounting hole, and a protection film is arranged on the bursting disc.