CN212967840U

CN212967840U - Power battery

Info

Publication number: CN212967840U
Application number: CN202021664053.0U
Authority: CN
Inventors: 张立鹏; 戴亨伟; 张阳; 程友民; 李瑞法; 方新荣; 张耀
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2020-08-11
Filing date: 2020-08-11
Publication date: 2021-04-13
Anticipated expiration: 2030-08-11

Abstract

The utility model relates to a power battery. The power battery comprises a top cover and a shell, wherein the shell is of an open-ended structure, a step is arranged on the inner side wall of the shell, the step is arranged on the inner side wall of the shell in a surrounding mode, a groove is formed in one side, close to the inner side wall of the shell, of the step, the top cover is arranged at the opening and is in butt joint with the step and covers the groove, and the top cover is welded with the shell. The step is arranged on the inner side wall of the shell of the power battery, the step surrounds the inner side wall of the shell, a groove is formed in one side, close to the inner side wall of the shell, of the step, the top cover covers the opening and is in butt joint with the step and covers the groove, and the top cover is welded with the shell. The step can avoid laser leakage when the top cover and the shell are welded by laser, and prevent burning of the internal structure of the battery; meanwhile, the groove in the step can receive welding slag generated during laser welding, and the welding slag is prevented from falling into the shell, so that the insulation and safety performance of the battery are effectively improved.

Description

Power battery

Technical Field

The utility model relates to a battery technology field especially relates to a power battery.

Background

At present, a top cover and an aluminum shell of a mainstream power battery are welded in a top welding mode, so that the requirement on the adaptation precision of the top cover and the aluminum shell is extremely high; on the other hand, the lower plane of the traditional top cover is generally provided with a chamfer, and the aluminum shell is only provided with certain chamfer-shaped steps at the short edge and the R angle position to limit the top cover and avoid the short edge and the R angle region of the top cover from sinking too seriously.

But at top cap and aluminum hull laser welding's in-process, if there is the clearance in the cap cooperation, very easily lead to welding laser leakage, in the laser heat directly kicks into the casing, harm naked electric core or naked electric core insulating piece in the casing, simultaneously, also very easily have the welding metal sediment to fall into in the casing, make electric core internal insulation bad, increase the safe risk of battery.

SUMMERY OF THE UTILITY MODEL

Therefore, a power battery capable of preventing light leakage and welding slag leakage during laser welding is needed.

The power battery comprises a top cover and a shell, wherein the shell is of a barrel-shaped structure with an opening at one end, a step is arranged on the inner side wall of the shell, the step is arranged on the inner side wall of the shell in a surrounding mode, a groove is formed in one side, close to the inner side wall of the shell, of the step, the top cover is arranged on the opening, is abutted to the step and covers the groove, and the top cover is welded with the shell.

The step is arranged on the inner side wall of the shell of the power battery, the step is arranged on the inner side wall of the shell in a surrounding mode, a groove is formed in one side, close to the inner side wall of the shell, of the step, the top cover covers the opening and is in butt joint with the step and covers the groove, and the top cover is welded with the shell. The step can avoid laser leakage when the top cover and the shell are welded by laser, and prevent burning of the internal structure of the battery; meanwhile, the groove in the step can receive welding slag generated during laser welding, and the welding slag is prevented from falling into the shell, so that the insulation and safety performance of the battery are effectively improved.

In one embodiment, the step has an abutting surface abutting against the top cover, wherein the groove is opened on a side of the abutting surface close to the inner side wall of the housing.

In one embodiment, the ratio of the width of the groove to the width of the abutting surface is 1: 3-5: 1.

In one embodiment, the depth of the groove is 0.01 mm-2 mm.

In one embodiment, the groove is selected from one of a semicircular groove, an arc-shaped groove, a triangular groove, a rectangular groove, and an irregular groove.

In one embodiment, the thickness of the shell on the side of the step close to the opening is smaller than the thickness of the shell on the side of the step far from the opening.

In one embodiment, the thickness of the shell on the side of the step close to the opening is 0.05 mm-0.3 mm smaller than the thickness of the shell on the side of the step far from the opening.

In one embodiment, the top cover is provided with an explosion-proof valve.

In one embodiment, the top cover is a rectangular plate-like structure.

In one embodiment, the housing is a square housing.

Drawings

Fig. 1 is a schematic structural diagram of a power battery according to an embodiment;

FIG. 2 is an exploded view of the power cell shown in FIG. 1;

FIG. 3 is a cross-sectional view of the power cell of FIG. 1 taken along A-A';

FIG. 4 is an enlarged view of the power cell shown in FIG. 3 at C;

FIG. 5 is an enlarged view of another embodiment of the power cell shown in FIG. 3 at C;

fig. 6 is an enlarged view of another embodiment at C of the power cell shown in fig. 3.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1 and 2, a power battery 10 according to an embodiment can provide power for an electric vehicle. Specifically, the power battery 10 includes a top cover 100 and a case 200.

The edges of the top cover 100 are chamfered around the circumference. Further, the angle of the chamfer is 95-175 degrees. Further, the angle of the chamfer is 120-150 °.

Further, the top cover 100 is provided with an explosion-proof valve 110. Further, the top cover 100 is provided with a liquid inlet 120, and the liquid inlet 120 is spaced apart from the explosion-proof valve 110. Specifically, the top cover 100 has a rectangular plate-like structure.

Referring to fig. 3 and 4, the housing 200 has an opening 201 at one end, a step 210 is disposed on an inner sidewall of the housing 200, the step 210 is disposed around the inner sidewall of the housing 200, a groove 220 is disposed on a side of the step 210 close to the inner sidewall of the housing 200, the top cover 100 covers the opening 201, abuts against the step 210, and covers the groove 220, and the top cover 100 is welded to the housing 200. Further, a step 210 is located on one side of the inner side wall of the housing 200 close to the opening 201. Specifically, the housing 200 has a barrel-shaped structure with one end open 201.

Further, the step 210 has an abutment surface 211, the abutment surface 211 abuts against the top cover 100, wherein the groove 220 is opened on a side of the abutment surface 211 close to the inner side wall of the housing 200. Furthermore, the ratio of the width of the groove 220 to the width of the abutting surface 211 is 1: 3-5: 1, so that welding slag can be better collected.

Further, the depth of the groove 220 is 0.01 mm-2 mm to better collect the welding slag.

Referring to fig. 5 and 6 together, the groove 220 is selected from one of a semicircular groove, an arc-shaped groove, a triangular groove, a rectangular groove, and an irregular groove. Wherein irregular grooves refer to grooves without a regular geometric pattern. In the embodiment of fig. 4, the recess 220 is a rectangular slot. In the embodiment of fig. 5, the groove 220 is a triangular groove. In the embodiment of fig. 6, the groove 220 is a semi-circular groove.

Further, the thickness of the housing 200 on the side of the step 210 close to the opening 201 is smaller than the thickness of the housing 200 on the side of the step 210 away from the opening 201. In the illustrated embodiment, the thickness of the housing 200 on the side of the step 210 close to the opening 201 is L1, and the thickness of the housing 200 on the side of the step 210 away from the opening 201 is L2.

Further, the thickness of the case 200 on the side of the step 210 close to the opening 201 is smaller by 0.05mm to 0.3mm than the thickness of the case 200 on the side of the step 210 far from the opening 201. Namely, L1 is 0.05mm to 0.3mm smaller than L2. Specifically, the housing 200 is a square housing 200.

It should be noted that, in other embodiments, the thickness of the housing 200 on the side of the step 210 close to the opening 201 may also be equal to the thickness of the housing 200 on the side of the step 210 far from the opening 201.

The power battery 10 has at least the following advantages:

1) the step 210 is arranged on the inner side wall of the casing 200 of the power battery 10, the step 210 is arranged around the inner side wall of the casing 200, the groove 220 is arranged on one side of the step 210 close to the inner side wall of the casing 200, the top cover 100 covers the opening 201 and is abutted to the step 210 and covers the groove 220, and the top cover 100 is welded to the casing 200. The step 210 can prevent laser leakage when the top cover 100 and the case 200 are welded by laser, and prevent burning of the internal structure of the battery; meanwhile, the groove 220 on the step 210 can receive welding slag during laser welding, and the welding slag is prevented from falling into the shell 200, so that the insulation and safety performance of the battery are effectively improved.

2) Step 210 on the casing 200 inside wall of the above-mentioned power battery 10 can go into the shell to the top cap 100 and form effective spacing, avoids the top cap 100 to sink down, or does not go into the shell to the assigned position, promotes into shell efficiency and precision.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The power battery is characterized by comprising a top cover and a shell;

the shell is of a structure with an opening at one end, a step is arranged on the inner side wall of the shell, the step is arranged on the inner side wall of the shell in a surrounding mode, and a groove is formed in one side, close to the inner side wall of the shell, of the step;

the top cover is covered on the opening, is abutted against the step and covers the groove;

the top cover is welded with the shell.

2. The power battery of claim 1, wherein the step has an abutment surface that abuts the top cover, wherein the groove opens on a side of the abutment surface that is adjacent to the housing interior sidewall.

3. The power battery of claim 2, wherein the ratio of the width of the groove to the width of the abutment surface is 1:3 to 5: 1.

4. The power battery as claimed in claim 1, wherein the depth of the groove is 0.01 mm-2 mm.

5. The power cell of claim 1, wherein the groove is selected from one of a semi-circular groove, an arc-shaped groove, an arch-shaped groove, a triangular groove, and a rectangular groove.

6. The power cell of claim 1, wherein a thickness of the housing on a side of the step proximate the opening is less than a thickness of the housing on a side of the step distal the opening.

7. The power battery as claimed in claim 6, wherein the thickness of the shell on the side of the step close to the opening is 0.05mm to 0.3mm smaller than the thickness of the shell on the side of the step far from the opening.

8. The power battery of claim 1, wherein the top cover is provided with an explosion-proof valve.

9. The power cell of claim 1, wherein the top cover is a rectangular plate-like structure.

10. The power cell of claim 1, wherein the housing is a square housing.