CN212967843U

CN212967843U - Square power battery cell

Info

Publication number: CN212967843U
Application number: CN202021742807.XU
Authority: CN
Inventors: 袁铖; 胡明江; 陈虎; 杨伟; 张耀
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2021-04-13
Anticipated expiration: 2030-08-18

Abstract

The utility model relates to a square power electricity core. This square power electricity core includes: the battery cell comprises a battery cell body, an insulating film, a first waterproof layer and a second waterproof layer, wherein the battery cell body is provided with a first surface, a first side surface, a second side surface and a bottom surface which are sequentially connected end to end; the insulating film is provided with a first area, a second area and a third area, the first area covers the first surface, the bottom surface and the second surface, the second area comprises a first laminating area, a second laminating area and a third laminating area, the first laminating area, the second laminating area and the third laminating area are laminated on the first side surface, the third area comprises a fourth laminating area, a fifth laminating area and a sixth laminating area, and the fourth laminating area, the fifth laminating area and the sixth laminating area are laminated on the second side surface; the first waterproof layer covers the joints of the first laminating area, the second laminating area and the third laminating area; the second waterproof layer covers the joints of the fourth laminated area, the fifth laminated area and the sixth laminated area. The square power battery cell is high in safety.

Description

Square power battery cell

Technical Field

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

Background

With the continuous heating of the world energy crisis and the environmental pollution problem, new energy electric vehicles are drawing attention by virtue of the advantages of energy conservation, environmental protection and the like, and gradually enter the market. The guarantee of the safety and the quality of the battery core of the lithium battery is an important ring for researching and developing a square aluminum shell battery core. The insulation of square aluminum hull electricity core is mainly realized through blue membrane of cladding outside the aluminum hull, nevertheless to the module of forced air cooling mode, can form the dewdrop on electric core surface, and there is the gap between the blue membrane of the cell shell overlapping department of traditional diolame mode, and the dewdrop can get into from this, leads to electric core outside creepage distance to shorten, and electric core is insulating bad, has very big potential safety hazard.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a square power cell with high safety.

A square power cell, comprising:

the battery cell comprises a battery cell body and a battery cell body, wherein the battery cell body is provided with a first surface, a first side surface, a second surface and a second side surface which are sequentially connected end to end, and a bottom surface which is connected with the first surface, the first side surface, the second surface and the second side surface, the first surface and the second surface are oppositely arranged, and the first side surface and the second side surface are oppositely arranged;

an insulating film having a first region, and a second region and a third region respectively connected to both sides of the first region, the first region being coated on the first surface, the bottom surface, and the second surface, the second region including a first lamination region, a second lamination region, and a third lamination region connected in sequence, the first lamination region, the second lamination region, and the third lamination region being laminated on the first side surface, the third region including a fourth lamination region, a fifth lamination region, and a sixth lamination region connected in sequence, the fourth lamination region, the fifth lamination region, and the sixth lamination region being laminated on the second side surface;

a first waterproof layer covering joints of the first, second, and third lamination areas to prevent moisture from entering gaps between the first, second, and third lamination areas;

and a second waterproof layer covering joints of the fourth, fifth, and sixth lamination areas to prevent moisture from entering gaps between the fourth, fifth, and sixth lamination areas.

The second area of the square power battery cell comprises a first laminating area, a second laminating area and a third laminating area which are sequentially connected, the first laminating area, the second laminating area and the third laminating area are laminated on the first side surface, and a first waterproof layer covers the joint of the first laminating area, the second laminating area and the third laminating area to prevent water from entering gaps among the first laminating area, the second laminating area and the third laminating area; the third area comprises a fourth stacking area, a fifth stacking area and a sixth stacking area which are sequentially connected, the fourth stacking area, the fifth stacking area and the sixth stacking area are stacked on the second side surface, and a second waterproof layer covers the joints of the fourth stacking area, the fifth stacking area and the sixth stacking area to prevent water from entering gaps among the fourth stacking area, the fifth stacking area and the sixth stacking area, so that water in the environment can be prevented from entering between the insulating film and the cell body, the problem of poor insulation of the cell is effectively solved, and the safety of the square power cell is improved.

In one embodiment, the minimum distance from the edge of the first waterproof layer to the seam of the first, second, and third laminate zones is greater than or equal to 3 times the thickness of the first waterproof layer; the minimum distance from the edge of the second waterproof layer to the joint of the fourth laminating area, the fifth laminating area and the sixth laminating area is greater than or equal to 3 times of the thickness of the second waterproof layer.

In one embodiment, the thickness of the first waterproof layer and the thickness of the second waterproof layer are both greater than the thickness of the insulating film by a factor of 3 or more.

In one embodiment, the ratio of the width of the first waterproof layer to the width of the first side surface is 0.05: 1-1: 1, and the ratio of the width of the second waterproof layer to the width of the second side surface is 0.05: 1-1: 1.

In one embodiment, the first waterproof layer and the second waterproof layer are both ultraviolet adhesive layers.

In one embodiment, the second stacking region, the first stacking region and the third stacking region are stacked in sequence, the second stacking region is located on the side of the first stacking region close to the first side surface, the fifth stacking region, the fourth stacking region and the sixth stacking region are stacked in sequence, and the fifth stacking region is located on the side of the fourth stacking region close to the second side surface.

In one embodiment, the insulating film includes an insulating layer and an adhesive layer stacked on the insulating layer, the adhesive layer having an area smaller than that of the insulating layer, wherein the first region, the second region, and the third region are distributed on the insulating layer.

In one embodiment, the adhesive layer covers the first region, a portion of the second region, and a portion of the third region.

In one embodiment, the adhesive layer of the second zone is in the form of a strip and is disposed adjacent to the first zone, and the adhesive layer of the third zone is in the form of a strip and is disposed adjacent to the first zone, the adhesive layer of the second zone being parallel to the adhesive layer of the third zone.

In one embodiment, the ratio of the width of the adhesive layer in the second region to the width of the first side surface is 0.01:1 to 0.45:1, and the ratio of the width of the adhesive layer in the third region to the width of the second side surface is 0.01:1 to 0.45: 1.

Drawings

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

fig. 2 is a schematic structural diagram of a cell body of the square power cell shown in fig. 1;

fig. 3 is an expanded view of an insulating film of the square power cell shown in fig. 1;

FIG. 4 is a schematic view of the structure of the insulating film shown in FIG. 3;

fig. 5 is a schematic structural diagram of a cell body and an insulating film of the square power cell shown in fig. 1;

fig. 6 is a schematic structural view of another angle of the square power cell shown in fig. 1;

FIG. 7 is a cross-sectional view of the square power cell of FIG. 6 taken along B-B';

fig. 8 is an enlarged view of portion I of the square power cell shown in fig. 7.

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, a square power cell 10 according to an embodiment can provide energy for an electric vehicle. Specifically, the square power cell 10 includes a cell body 100, an insulating film 200, a first waterproof layer 300, and a second waterproof layer (not shown).

Referring to fig. 2, the battery cell body 100 has a first surface 110, a first side surface 120, a second surface 130, and a second side surface 140, which are sequentially connected end to end, and a bottom surface 150 connected to the first surface 110, the first side surface 120, the second surface 130, and the second side surface 140, wherein the first surface 110 and the second surface 130 are disposed opposite to each other, and the first side surface 120 and the second side surface 140 are disposed opposite to each other. Further, the first surface 110 and the second surface 130 are disposed in parallel, and the first side 120 and the second side 140 are disposed in parallel.

Referring to fig. 3, the insulating film 200 has a first region 210, and a second region 220 and a third region 230 respectively connected to two sides of the first region 210, the first region 210 covers the first surface 110, the bottom surface 150, and the second surface 130, the second region 220 includes a first stacked region 221, a second stacked region 222, and a third stacked region 223 sequentially connected, and the first stacked region 221, the second stacked region 222, and the third stacked region 223 are stacked on the first side surface 120. Further, the second stacking region 222, the first stacking region 221, and the third stacking region 223 are sequentially stacked, and the second stacking region 222 is located on the side of the first stacking region 221 close to the first side surface 120, so that the connection among the second stacking region 222, the first stacking region 221, and the third stacking region 223 is tighter.

The third region 230 includes a fourth stacked region 231, a fifth stacked region 232, and a sixth stacked region 233, which are sequentially connected, and the fourth stacked region 231, the fifth stacked region 232, and the sixth stacked region 233 are stacked on the second side surface 140. Further, a fifth stacking region 232, a fourth stacking region 231, and a sixth stacking region 233 are sequentially stacked, and the fifth stacking region 232 is located on the side of the fourth stacking region 231 near the second side surface 140, so that the connection among the fifth stacking region 232, the fourth stacking region 231, and the sixth stacking region 233 is more tight.

The first stacked region 221 and the fourth stacked region 231 are symmetrically disposed, the second stacked region 222 and the fifth stacked region 232 are symmetrically disposed, and the third stacked region 223 and the sixth stacked region 233 are symmetrically disposed.

Referring to fig. 4, the insulating film 200 includes an insulating layer 240 and an adhesive layer 250 stacked on the insulating layer 240, wherein the adhesive layer 250 has an area smaller than that of the insulating layer 240, and the first region 210, the second region 220, and the third region 230 are distributed on the insulating layer 240.

Further, the adhesive layer 250 covers the first region 210, a portion of the second region 220, and a portion of the third region 230.

Further, the adhesive layer 250 of the second region 220 has a stripe shape and is disposed adjacent to the first region 210, the adhesive layer 250 of the third region 230 has a stripe shape and is disposed adjacent to the first region 210, and the adhesive layer 250 of the second region 220 is parallel to the adhesive layer 250 of the third region 230.

Specifically, the ratio of the width of the bonding layer 250 of the second region 220 to the width of the first side surface 120 is 0.01:1 to 0.45: 1; the ratio of the width of the bonding layer 250 in the third region 230 to the width of the second side surface 140 is 0.01:1 to 0.45: 1.

Specifically, the insulating layer 240 is a polyethylene terephthalate base film; the adhesive layer 250 is an acrylic adhesive layer. More specifically, the insulating film 200 is a blue film.

Referring to fig. 5, the first waterproof layer 300 covers the seam 201 of the first stacking region 221, the second stacking region 222, and the third stacking region 223 to prevent moisture from entering the gap between the first stacking region 221, the second stacking region 222, and the third stacking region 223, so as to effectively solve the problem of poor cell insulation and improve the safety of the square power cell 10.

Referring to fig. 6 to 8, the minimum distance a from the edge of the first waterproof layer 300 to the seam 201 of the first stacking region 221, the second stacking region 222, and the third stacking region 223 is greater than or equal to 3 times the thickness of the first waterproof layer 300, so that the first waterproof layer 300 covers the seam 201 of the first stacking region 221, the second stacking region 222, and the third stacking region 223 in a larger area, the climbing distance of moisture is increased, the moisture is difficult to reach the joint between the insulating film 200 and the cell body 100, and the safety of the square power cell 10 is improved.

Specifically, the thickness of the first waterproof layer 300 is more than 3 times greater than that of the insulating film 200 to increase the waterproof effect of the first waterproof layer 300.

Further, the ratio of the width of the first waterproof layer 300 to the width of the first side surface 120 is 0.05:1 to 1:1, so as to better cover the seam 201 of the first lamination area 221, the second lamination area 222 and the third lamination area 223. In one embodiment, the width of the first waterproof layer 300 is equal to the width of the first side 120.

Specifically, the first waterproof layer 300 is an ultraviolet adhesive layer.

The second waterproof layer covers joints (not shown) of the fourth stacking area 231, the fifth stacking area 232 and the sixth stacking area 233 to prevent moisture from entering gaps among the fourth stacking area 231, the fifth stacking area 232 and the sixth stacking area 233, so that the problem of poor cell insulation is effectively solved, and the safety of the square power cell 10 is improved.

Further, the minimum distance from the edge of the second waterproof layer to the joint of the fourth laminated region 231, the fifth laminated region 232, and the sixth laminated region 233 is greater than or equal to 3 times the thickness of the second waterproof layer, so that the second waterproof layer covers the joint of the fourth laminated region 231, the fifth laminated region 232, and the sixth laminated region 233 in a larger area, the climbing distance of the moisture is increased, the moisture is made difficult to reach the joint of the insulating film 200 and the cell body, and the safety of the square power cell 10 is improved.

Specifically, the thickness of the second waterproof layer is more than 3 times greater than that of the insulating film 200 to increase the waterproof effect of the second waterproof layer.

Further, the ratio of the width of the second waterproof layer to the width of the second side surface 140 is 0.05:1 to 1:1, so as to better cover the seam of the fourth laminated area 231, the fifth laminated area 232, and the sixth laminated area 233. In one embodiment, the width of the second waterproof layer is equal to the width of the second side surface 140.

Specifically, the second waterproof layer is an ultraviolet glue layer.

The coating process of the square power battery cell 10 is as follows:

coating a first area 210 of a blue film on the first surface 110, the bottom surface 150 and the second surface 130 of the battery cell body 100 in a U-shaped coating manner, sequentially folding a second laminating area 222, a first laminating area 221 and a third laminating area 223 on the first side surface 120, and coating ultraviolet glue on a seam 201 of the first laminating area 221, the second laminating area 222 and the third laminating area 223 to form a first waterproof layer; and then, the fifth laminating area 232, the fourth laminating area 231 and the sixth laminating area 233 are sequentially folded on the second side surface 140, and ultraviolet glue is coated on the seams of the fourth laminating area 231, the fifth laminating area 232 and the sixth laminating area 233 to form a second waterproof layer.

The square power cell 10 at least has the following advantages:

1) the second region 220 of the square power cell 10 includes a first stacking region 221, a second stacking region 222, and a third stacking region 223, which are connected in sequence, wherein the first stacking region 221, the second stacking region 222, and the third stacking region 223 are stacked on the first side surface 120, and the first waterproof layer 300 covers the seam 201 of the first stacking region 221, the second stacking region 222, and the third stacking region 223, so as to prevent moisture from entering the gap between the first stacking region 221, the second stacking region 222, and the third stacking region 223; the third region 230 includes a fourth stacking region 231, a fifth stacking region 232, and a sixth stacking region 233, which are sequentially connected, the fourth stacking region 231, the fifth stacking region 232, and the sixth stacking region 233 are stacked on the second side surface 140, and a second waterproof layer covers a seam of the fourth stacking region 231, the fifth stacking region 232, and the sixth stacking region 233 to prevent moisture from entering a gap between the fourth stacking region 231, the fifth stacking region 232, and the sixth stacking region 233, so that moisture in the environment can be prevented from entering between the insulating film 200 and the cell body 100, the problem of poor cell insulation is effectively solved, and the safety of the square power cell 10 is improved.

2) The square power battery cell 10 is simple in structure and easy to realize automatic production; on the premise of not changing the mainstream coating mode, a first waterproof layer 300 and a second waterproof layer are formed at the joint 201, so that the popularization is easy, and the coating battery cell can be derived from various types of coating battery cells; meanwhile, the problem that the insulating film 200 is turned out at the seam is solved.

3) Above-mentioned square power electricity core 10 can be general in the module of forced air cooling and water-cooling mode, and has better reliability and waterproof performance.

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. A square power cell, comprising:

2. The square power cell of claim 1, wherein a minimum distance from an edge of the first waterproof layer to a seam of the first, second, and third lamination zones is greater than or equal to 3 times a thickness of the first waterproof layer; the minimum distance from the edge of the second waterproof layer to the joint of the fourth laminating area, the fifth laminating area and the sixth laminating area is greater than or equal to 3 times of the thickness of the second waterproof layer.

3. The square power cell of claim 1, wherein the thickness of the first waterproof layer and the thickness of the second waterproof layer are both greater than the thickness of the insulating film by a factor of 3 or more.

4. The square power cell of claim 1, wherein a ratio of the width of the first waterproof layer to the width of the first side surface is 0.05:1 to 1:1, and a ratio of the width of the second waterproof layer to the width of the second side surface is 0.05:1 to 1: 1.

5. The square power cell of claim 1, wherein the first and second waterproof layers are both ultraviolet glue layers.

6. The square power cell of claim 1, wherein the second stacking region, the first stacking region, and the third stacking region are stacked in sequence, the second stacking region is located on a side of the first stacking region adjacent to the first side surface, the fifth stacking region, the fourth stacking region, and the sixth stacking region are stacked in sequence, and the fifth stacking region is located on a side of the fourth stacking region adjacent to the second side surface.

7. The square power cell of claim 1, wherein the insulating film comprises an insulating layer and an adhesive layer laminated on the insulating layer, the adhesive layer having an area smaller than an area of the insulating layer, and wherein the first, second, and third regions are distributed on the insulating layer.

8. The square power cell of claim 7, wherein the adhesive layer covers the first region, a portion of the second region, and a portion of the third region.

9. The square power cell of claim 8, wherein the adhesive layer of the second zone is strip-shaped and disposed proximate to the first zone, and the adhesive layer of the third zone is strip-shaped and disposed proximate to the first zone, the adhesive layer of the second zone being parallel to the adhesive layer of the third zone.

10. The square power cell of claim 9, wherein a ratio of a width of the adhesive layer of the second region to a width of the first side surface is 0.01:1 to 0.45:1, and a ratio of a width of the adhesive layer of the third region to a width of the second side surface is 0.01:1 to 0.45: 1.