CN215342894U

CN215342894U - Annotate liquid hole seal structure and battery top cap

Info

Publication number: CN215342894U
Application number: CN202121396570.9U
Authority: CN
Inventors: 翁勇新; 张万财
Original assignee: Xiamen Haichen New Energy Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2021-12-28
Anticipated expiration: 2031-06-23

Abstract

The utility model discloses a liquid injection hole sealing structure and a battery top cover, which comprise a liquid injection hole and a sealing nail, wherein the liquid injection hole and the sealing nail are arranged on a cover plate, the upper part of the liquid injection hole is provided with an inverted cone-shaped counter sink hole with a large upper part and a small lower part, the sealing nail is in an inverted frustum shape matched with the counter hole, a limiting structure is also arranged between the sealing nail and the counter hole, and the limiting structure is used for limiting the sealing nail placed in the counter hole. This seal structure spacing effect is better after sealed nail installation, and sealed nail is difficult for jumping to shift and causes the installation badly, can promote sealed nail installation goodness, because sealed nail has spacing better, sealed nail also is difficult for appearing jumping the aversion scheduling problem during the welding, is difficult for producing the rosin joint, and welding strength is more stable, has improved welding defects such as the welding seam when sealed nail welds subsides, step, explosion point moreover, can promote the welding goodness.

Description

Annotate liquid hole seal structure and battery top cap

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a liquid injection hole sealing structure and a battery top cover.

Background

The power battery comprises a battery core, a shell and a cover plate, wherein a positive electrode lug and a negative electrode lug are arranged on the battery core, and a positive electrode column, a negative electrode column, a liquid injection hole and an explosion-proof valve are arranged on the cover plate. When the battery is assembled, the positive tab and the negative tab are welded with the positive pole column and the negative pole column correspondingly, then the battery core is placed in the shell, the cover plate and the shell are welded to form a semi-finished battery, and the power battery is obtained through a series of processes such as liquid injection, formation and capacity.

The battery is required to seal the liquid injection hole in the cover plate after liquid injection, so that the battery core is isolated from the external environment, the chemical environment required by the work of the battery is ensured, and the leakage of electrolyte can be prevented. The existing sealing structure of the liquid injection hole is shown in fig. 1, a circular counter sink 12 is arranged at the upper part of a liquid injection hole 11 of a cover plate 1, after liquid injection, a sealing nail 2 is placed in the counter sink 12, and then the sealing nail 2 and the cover plate 1 are welded by laser after the sealing nail is transferred to a welding station. Because the thickness of the sealing nail is thin, the sealing nail is not easy to be flatly placed in the counter sink, the placing efficiency of the sealing nail is low, and the sealing nail is easy to shift or jump after being placed, so that poor welding is caused, and the welding strength is insufficient and the welding goodness is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: to present notes liquid hole seal structure have sealed nail difficult assembly, shift easily or beat and then cause the welding bad, the problem that the welding goodness is low, provide a annotate liquid hole seal structure and battery top cap, through optimizing sealed nail and the cooperation structure of annotating between the liquid hole for spacing effect is better after sealed nail installation, the difficult aversion or the condition of beating of appearing, has improved sealed nail welding quality greatly, is favorable to promoting the welding goodness.

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

the utility model provides a annotate liquid hole seal structure, is including locating notes liquid hole and sealed nail on the apron, the upper portion of annotating the liquid hole is equipped with big-end-up's back taper counter bore, sealed nail be with the inverted frustum shape of counter bore looks adaptation, sealed nail with still be equipped with limit structure between the counter bore contact surface, limit structure is arranged in carrying on spacingly to the sealed nail of putting into in the counter bore.

According to the utility model, the sealing nail and the counter sink are arranged into the matched conical surface structures, so that the pre-positioning effect can be achieved when the sealing nail is placed, the conical surface can avoid laser welding light leakage, and the limiting structure can limit the sealing nail placed in the counter sink, so that the sealing nail is prevented from moving relative to the counter sink along the conical surface; this seal structure spacing effect is better after sealed nail installation, and sealed nail is difficult for jumping to shift and causes the installation badly, can promote sealed nail installation goodness, because sealed nail has spacing better, sealed nail also is difficult for appearing jumping the aversion scheduling problem during the welding, is difficult for producing the rosin joint, and welding strength is more stable, has improved welding defects such as the welding seam when sealed nail welds subsides, step, explosion point moreover, can promote the welding goodness.

As a preferable scheme of the utility model, the limiting structure comprises a boss arranged on the conical surface of the sealing nail and a groove arranged on the conical surface of the counter bore, and the boss is matched with the groove to limit the sealing nail. Through corresponding setting up boss and recess on the sealed nail and the cooperation conical surface of counter sink, when sealed nail was laid to the counter sink, the boss cooperateed with the recess and carries on spacingly to sealed nail, has avoided sealed nail to take place the condition of dislocation for the counter sink along the conical surface.

In a preferred embodiment of the present invention, the bore diameter of the small-diameter end of the counter bore is larger than the bore diameter of the liquid injection hole, so that a transition step surface is formed between the counter bore and the liquid injection hole.

A battery top cover comprises a cover plate, a positive pole column, a negative pole column and the sealing structure of the liquid injection hole. After the liquid injection hole sealing structure is adopted, the overall quality and the production efficiency of the battery top cover can be improved.

As a preferable scheme of the utility model, the cover plate is further provided with an explosion-proof valve, and the explosion-proof valve is positioned between the positive pole column and the negative pole column. The cover plate is provided with the explosion-proof valve, so that the explosion-proof valve is automatically opened to release pressure when the internal pressure of the battery is too high.

In a preferred embodiment of the present invention, the liquid injection hole is located between the positive post and the explosion-proof valve.

In a preferred embodiment of the present invention, the cover plate has top cover brackets respectively disposed at two ends of a bottom surface thereof for supporting the battery top cover when the battery top cover is mounted to the opening of the housing.

In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:

1. according to the utility model, the sealing nail and the counter sink are arranged into the matched conical surface structures, so that the pre-positioning effect can be achieved when the sealing nail is placed, the conical surface can avoid laser welding light leakage, and the limiting structure can limit the sealing nail placed in the counter sink, so that the sealing nail is prevented from moving relative to the counter sink along the conical surface; the sealing structure has a good limiting effect after the sealing nail is installed, the sealing nail is not easy to jump and shift to cause poor installation, the installation goodness of the sealing nail can be improved, due to the fact that the sealing nail has better limiting effect, the sealing nail is not easy to jump and shift during welding, and the like, the insufficient welding is not easy to generate, the welding strength is more stable, welding defects such as welding seam collapse, steps, explosion points and the like during welding of the sealing nail are improved, and the welding goodness can be improved;

2. the limiting structure comprises a boss arranged on the conical surface of the sealing nail and a groove arranged on the conical surface of the counter bore, the boss is matched with the groove, the boss and the groove are correspondingly arranged on the conical surface of the sealing nail and the conical surface of the counter bore, when the sealing nail is placed in the counter bore, the boss is matched with the groove to limit the sealing nail, and the condition that the sealing nail generates dislocation relative to the counter bore along the conical surface is avoided.

Drawings

FIG. 1 is a schematic view of a sealing structure of a pour hole in the prior art.

FIG. 2 is a schematic view of the sealing structure of the pour hole in the present invention.

FIG. 3 is a partial schematic view of the pour hole in the lid of FIG. 2.

Fig. 4 is a schematic view of the sealing nail of fig. 2.

Fig. 5 is a schematic view of a battery top cap in accordance with the present invention.

The labels in the figure are: 1-cover plate, 11-liquid injection hole, 12-counter bore, 121-groove, 2-sealing nail, 21-boss, 3-positive pole column, 4-negative pole column, 5-explosion-proof valve, 6-top cover bracket.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Example 1

The embodiment provides a sealing structure of a liquid injection hole;

as shown in fig. 2-4, the liquid injection hole sealing structure in this embodiment includes a liquid injection hole 11 and a sealing nail 2, which are disposed on a cover plate 1, wherein an inverted cone-shaped counter bore 12 with a large top and a small bottom is disposed on an upper portion of the liquid injection hole 11, the sealing nail 2 is in an inverted truncated cone shape matched with the counter bore 12, and a limiting structure is further disposed between the sealing nail 2 and a contact surface of the counter bore 12, and the limiting structure is used for limiting the sealing nail 2 placed in the counter bore 12.

In this embodiment, the limiting structure includes a boss 21 disposed on the conical surface of the sealing nail 2, and a groove 121 disposed on the conical surface of the counter sink 12, and the boss 21 and the groove 121 cooperate to limit the sealing nail 2. Through corresponding setting up boss and recess on the sealed nail and the cooperation conical surface of counter sink, when sealed nail was laid to the counter sink, the boss cooperateed with the recess and carries on spacingly to sealed nail, has avoided sealed nail to take place the condition of dislocation for the counter sink along the conical surface.

In this embodiment, the boss 21 is circumferentially arranged along the conical surface of the seal nail 2, and the groove 121 is circumferentially arranged along the conical surface of the counter bore 12. In addition, it can be understood that the arrangement positions of the boss and the groove in this embodiment can be reversed, that is, the boss is arranged on the conical surface of the counter bore, and the groove is arranged on the conical surface of the seal pin.

In this embodiment, the diameter of the small-diameter end of the counter bore 12 is larger than the diameter of the liquid injection hole 11, so that a transition step surface is formed between the counter bore and the liquid injection hole.

Example 2

As shown in fig. 5, the present embodiment provides a battery top cap, which comprises a cover plate 1, a positive electrode post 3, a negative electrode post 4, and the electrolyte injection hole sealing structure described in embodiment 1. After the liquid injection hole sealing structure is adopted, the overall quality and the production efficiency of the battery top cover can be improved.

In this embodiment, the cover plate 1 is further provided with an explosion-proof valve 5, and the explosion-proof valve 5 is located between the positive pole post 3 and the negative pole post 4. The cover plate is provided with the explosion-proof valve, so that the explosion-proof valve is automatically opened to release pressure when the internal pressure of the battery is too high.

In this embodiment, the liquid inlet 11 is located between the positive post 3 and the explosion-proof valve 5.

In this embodiment, the two ends of the bottom surface of the cover plate 1 are respectively provided with a top cover bracket 6 for supporting when the battery top cover is mounted on the opening of the housing. Specifically, when the battery top cover is welded with the shell, the top cover bracket extends into the shell and is supported on a step on the inner wall of the shell.

In this embodiment, the positive electrode post 3 and the negative electrode post 4 are used for being correspondingly connected with the positive electrode tab and the negative electrode tab on the battery core, wherein the positive electrode post 3 is made of an aluminum material, the negative electrode post 4 is made of a copper-aluminum composite material, specifically, the material of the part of the negative electrode post extending into the casing is a copper material, and the rest of the negative electrode post can be made of an aluminum material, so that the electrochemical reaction of the battery negative electrode can be avoided, and the cost and the weight of the negative electrode post can be reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a annotate liquid hole seal structure, its characterized in that is including locating notes liquid hole and sealed nail on the apron, the upper portion of annotating the liquid hole is equipped with big-end-up's back taper counter sink, sealed nail be with the inverted frustum shape of counter sink hole adaptation, sealed nail with still be equipped with limit structure between the counter sink contact surface, limit structure is arranged in carrying on spacingly to the sealed nail of putting into in the counter sink.

2. The liquid injection hole sealing structure according to claim 1, wherein the limiting structure comprises a boss on the conical surface of the sealing nail and a groove on the conical surface of the counter bore, and the boss and the groove cooperate to limit the sealing nail.

3. The pour hole sealing structure according to claim 1 or 2, wherein the bore diameter of the small-diameter end of the counterbore is larger than the bore diameter of the pour hole.

4. A battery top cap, characterized by, include apron, positive post, negative pole post and the notes liquid hole seal structure of claim 3.

5. The battery top cap of claim 4, wherein an explosion-proof valve is further disposed on the cover plate and is located between the positive post and the negative post.

6. The battery top cap of claim 5, wherein the liquid injection hole is located between the positive post and the explosion-proof valve.

7. The battery top cap of claim 6, wherein top cap brackets are respectively arranged at two ends of the bottom surface of the cover plate.