CN218039724U

CN218039724U - Full-tab pole piece and winding battery

Info

Publication number: CN218039724U
Application number: CN202222228738.6U
Authority: CN
Inventors: 黄卫国; 周蔚然; 刘昱霖; 黄笑; 程磊; 朱玉娇; 秦波; 王光俊; 陈炜; 张宏立
Original assignee: Hefei Guoxuan High Tech Power Energy Co Ltd
Current assignee: Hefei Gotion High Tech Power Energy Co Ltd
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2022-12-13
Anticipated expiration: 2032-08-24

Abstract

The utility model discloses a full utmost point ear pole piece and coiling battery, which comprises a pole piece, the pole piece includes coating district and the district that leaves white adjacent with coating district, leave white the district including not cutting district and its top interval distribution's utmost point ear, utmost point ear is including the guide area territory and the indentation region of being connected with guide area territory one end, the guide area territory other end is connected and is not cut the district. The indentation areas comprise a first indentation area and a second indentation area, and the first indentation area and the second indentation area are respectively positioned on two opposite sides of the indentation area. And the full-lug pole piece is wound around the hole core to form a full-lug wound battery. The utility model discloses a predominant use is at positive and negative pole piece coiling in-process or positive and negative pole piece coiling completion back, forms the whole utmost point ear in-process, reduces the pressure of pacifying utmost point ear to the reduction is to the damage of positive and negative pole piece of battery.

Description

Full-tab pole piece and winding battery

Technical Field

The utility model relates to the technical field of batteries, more specifically say and relate to a full utmost point ear pole piece and winding battery.

Background

With the continuous development of science and technology, lithium ion batteries have the advantages of high specific power, long cycle life, good safety performance, no pollution and the like, so that the lithium ion batteries are widely applied. The traditional winding type battery is mainly a single-pole or multi-pole winding type battery, and the full-pole winding type battery is more and more approved due to low internal resistance and high energy density. In the full-tab winding type battery, one end of positive and negative electrode plates is usually coated with an active material, the part coated with the active material is called a coating area, the other end of the positive and negative electrode plates is a blank part, namely, the part is not coated with the active material, the blank part is flattened to form a full tab in the winding process of the positive and negative electrode plates or after the positive and negative electrode plates are wound.

Through retrieval, chinese patent No. CN114122630A discloses a method for manufacturing a multi-tab pole piece and a method for manufacturing a battery cell, and provides a pole piece, where the pole piece includes a hollow foil region; and cutting the empty foil area to form a plurality of lugs with quadrilateral structures so as to obtain the multi-lug pole piece. This patent application, at the in-process of coiling the pole piece, smooth utmost point ear while coiling, in order to smooth utmost point ear, need exert great pressure on the surface of perpendicular to pole piece (two cylindrical terminal surfaces of the cylindrical battery that form after coiling promptly) usually, this leads to the active material on the inside positive and negative pole piece to drop easily, causes the deformation of inside pole piece even, greatly reduced the performance of coiling formula battery.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

To at least some problems that exist among the prior art, the utility model provides a full utmost point ear pole piece and coiling battery, at positive negative pole piece coiling in-process or positive negative pole piece coiling completion back, form full utmost point ear in-process, reduce the pressure of pacifying utmost point ear to the reduction is to the damage of battery positive negative pole piece.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model provides a full utmost point ear pole piece, includes the pole piece, the pole piece includes coating district and the district that leaves whitewashed adjacent with the coating district, leave whitewashed district including the utmost point ear of not cutting district and above interval distribution, the utmost point ear includes the direction region and the indentation region of being connected with direction region one end, the not cutting district is connected to the direction region other end.

Further, the indentation areas comprise a first indentation area and a second indentation area, which are located on two opposite sides of the indentation area, respectively.

Further, the first indentation area faces the direction away from the axis of the pole piece after being wound into a cylinder, and the second indentation area faces the direction of the axis of the pole piece after being wound into the cylinder.

Further, a bending angle alpha exists between the same face of the guide area and the second indentation area.

Further, the bending angle α is an obtuse angle.

Further, the bending angle alpha is 95-170 degrees.

Further, the height of the tab is in proportional relation to the height of the guide area.

Further, the height of the tab is 3 to 15 times of the height of the guide area.

Furthermore, the height of the pole lug is 3-15mm, and the height of the guide area is 1-5mm.

Further, the height of the indentation area is 3-13mm.

Further, the height of the uncut area is 0.5-5mm.

Furthermore, a special coating area is arranged in the uncut area, and the height of the special coating area is 0-4.5mm.

The utility model also provides a coiling battery, including the hole core, including above full utmost point ear pole piece, full utmost point ear pole piece is convoluteed around the hole core.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with existing well-known technique, have following beneficial effect:

(1) The utility model provides a pair of full utmost point ear pole piece, the blank district of pole piece is constituteed by the utmost point ear of not cutting district and top, and utmost point ear includes that guide area and indentation are regional, does not cut the district and can guarantee that utmost point ear cutting process coating district does not receive the damage, and the utmost point ear is rubbed to reserve at ordinary times and is not cut the district and can alleviate coating district extrusion force simultaneously.

(2) The utility model provides a pair of full utmost point ear pole piece is equipped with the angle of bending between guide area territory and the indentation region territory, smooths utmost point ear in-process to the inward folding, makes the pressure of smoothing utmost point ear effectively apply on the indentation region, can effectively reduce the pressure of smoothing utmost point ear to reduce the damage of adjusting the negative pole piece well

(3) The utility model provides a pair of full utmost point ear pole piece does not contain the special coating region of part in the cutting region, and special coating region can be for rubber coating or ceramic coating, and special coating region can increase the security performance of electric core.

(4) The utility model also provides a winding battery, this winding battery design scheme is simple not only, and processing property, electrical property are good moreover, and productivity is high, and the practicality is strong.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic front structural view of a tab in the present invention;

fig. 3 is a schematic view of the back structure of the middle tab of the present invention;

fig. 4 is a schematic side view of the tab of the present invention;

FIG. 5 is a front view of the wound pole piece of the present invention;

FIG. 6 is a side view of the wound pole piece of the present invention;

fig. 7 is a comparison diagram of the height of the bending area and the non-bending area of the tab in the side view of the middle winding core of the utility model.

The reference numerals in the schematic drawings illustrate:

1. pole pieces; 2. an uncut region; 3. cutting an area; 4. a guiding area; 5. a first indentation area; 6. a second indentation area; 7. and (4) a hole core.

Detailed Description

For a further understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.

Examples

The terms of orientation such as up, down, left, right, front, back, top, bottom, etc. (if any) referred to in this embodiment are defined as the positions of the structures in the drawings and the positions of the structures relative to each other, and are only used for the sake of clarity and convenience of the technical solution. It is to be understood that the use of directional terms should not be taken to limit the scope of what is claimed herein.

As shown in fig. 1 to 4, the present embodiment provides a full tab electrode plate, including an electrode plate 1, where the electrode plate 1 includes a coating area and a blank area adjacent to the coating area, the coating area and the blank area are arranged in parallel, the blank area includes a non-cutting area 2 and tabs 3 spaced above the non-cutting area 2, the spacing distance between each tab 3 may be equal or unequal, each tab 3 includes a guide area 4 and an indentation area connected to one end of the guide area 4, the other end of the guide area 4 is connected to the non-cutting area 2, a special coating area is disposed in the non-cutting area 2, the height of the special coating area is 0 to 4.5mm, the special coating area may be a glue coating layer or a ceramic coating layer, and the special coating area may increase the safety performance of an electrical core.

In addition, the uncut region 2 can ensure that the coating region is not damaged in the cutting process of the tab 3, and meanwhile, the uncut region 2 is reserved in the kneading process of the tab 3 to relieve the extrusion force on the coating region and reduce the damage to the pole piece.

Referring to fig. 2-4, in the present embodiment, the indentation areas include a first indentation area 5 and a second indentation area 6, and the first indentation area 5 and the second indentation area 6 are located on two opposite sides of the indentation area, respectively. A bending angle exists between the guide area 4 and the indentation area, specifically, a bending angle alpha exists between the same surface of the guide area 4 and the second indentation area 6, and the bending angle alpha is an obtuse angle and is 95-170 degrees. The indentation area is provided with indentations which are single-sided indentations, double-sided indentations and alternate indentations with equal or unequal intervals on two sides, the indentations can be single or multiple, the shapes of the indentations can be open or closed curves, circles, rhombuses, triangles, polygons, combinations of various shapes or different shapes, and the like, and the indentation depth is 0.2-6 mu m.

The indentation can make utmost point ear 3 have certain guide effect when convoluteing, reduces and rubs flat volume and rubs flat pressure, reduces simultaneously and rubs flat in-process utmost point ear 3 damage, and the indentation can increase utmost point ear 3's intensity simultaneously, reduces the winding process and rolls the risk of utmost point ear 3, reduces and rubs the damaged metal fillings that produce of flat in-process utmost point ear 3. And indentation can increase subsequent welding contact points, reduce the breakage probability of the tab in the winding process and improve the subsequent welding quality.

Referring to fig. 5 and 6, the pole piece 1 is wound around the perforated core 7 to form a battery, which when wound forms a cylindrical battery. The first indentation area 5 faces the direction away from the axis of the pole piece after being wound into a cylinder, and the second indentation area 6 faces the direction of the axis of the pole piece after being wound into the cylinder.

In this embodiment, a winding mode is adopted to prepare a battery winding core, the tab 3 in fig. 1 is set to be a polygonal structure, and the winding direction of the pole piece 1 is consistent with the direction of the bending angle α in the process of winding the pole piece 1 to form a battery core. In the winding process or after the winding is completed, the lug 3 is flattened towards the hole core 7, a bending angle exists between the guide area 4 and the indentation area, the indentation area forms an inclined plane on the end face of the lug 3, the roller pressure required when the lug 3 is flattened can be effectively reduced, the deformation of the pole piece 1 is avoided, the falling-off of active materials on the pole piece 1 is reduced, and the yield of the electric core formed by winding the pole piece is greatly improved.

After the tab 3 is rolled around the hole core 7, the indentation area forms an inclined plane, so that the height of the tab 3 is also changed, and the height H of the tab 3 before being bent is greater than the height H of the tab 3 after being bent, as shown in fig. 7.

The polygonal structure design of utmost point ear 3 can make utmost point ear 3 orientation have certain guide effect when convoluteing, makes utmost point ear orientation unanimous, smooths 3 inward folding in-process of utmost point ear, can reduce follow-up volume of rubbing and rub flat power to make do not need very big pressure when smoothing utmost point ear 3, can reduce the stress that causes utmost point ear 3 to bend, reduce the book damage of utmost point ear 3.

Specifically, in the embodiment, the height of the tab 3 is in a proportional relation with the height of the guide area 4, the height of the tab 3 is 3 to 15 times of the height of the guide area 4, wherein the height of the tab 3 is 3 to 15mm, and the height of the guide area 4 is 1 to 5mm. The height of the indentation area is 3-13mm. The height of the uncut area 2 is 0.5-5mm.

The utility model also provides a winding battery, including hole core 7, adopt foretell utmost point ear pole piece entirely, wherein utmost point ear pole piece is convoluteed around hole core 7, and this winding battery not only the design is simple, and the processing property moreover, the electrical property is good, and the productivity is high, and the practicality is strong.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. The utility model provides a full utmost point ear pole piece, includes pole piece (1), pole piece (1) are including coating district and the district that leaves white adjacent with the coating district, leave white district including not cutting district (2) and utmost point ear (3) of its top interval distribution, its characterized in that: the tab (3) comprises a guide area (4) and an indentation area connected with one end of the guide area (4), and the other end of the guide area (4) is connected with the uncut area (2).

2. The full-tab pole piece of claim 1, wherein: the indentation area comprises a first indentation area (5) and a second indentation area (6), and the first indentation area (5) and the second indentation area (6) are respectively positioned on two opposite sides of the indentation area.

3. The full-tab pole piece of claim 2, wherein: the first indentation area (5) faces the direction away from the axis of the pole piece after being wound into a cylinder, and the second indentation area (6) faces the direction of the axis of the pole piece after being wound into the cylinder.

4. The full-tab pole piece of claim 3, wherein: a bending angle alpha exists between the same surface of the guide area (4) and the second indentation area (6).

5. The full-tab pole piece as claimed in claim 4, wherein: the bending angle alpha is an obtuse angle.

6. The full-tab pole piece of claim 5, wherein: the bending angle alpha is 95-170 degrees.

7. The full-tab pole piece according to any one of claims 1 to 6, wherein: the height of the tab (3) is in proportional relation to the height of the guide area (4).

8. The full-tab pole piece of claim 7, wherein: the height of the tab (3) is 3 to 15 times of the height of the guide area (4).

9. The full-tab pole piece of claim 8, wherein: the height of the tab (3) is 3-15mm, and the height of the guide area (4) is 1-5mm.

10. The full-tab pole piece of claim 9, wherein: the height of the indentation area is 3-13mm.

11. The full-tab pole piece of claim 1, wherein: the height of the uncut area (2) is 0.5-5mm.

12. The full-tab pole piece of claim 11, wherein: a special coating area is arranged in the uncut area (2), and the height of the special coating area is 0-4.5mm.

13. A wound battery comprising a porous core (7), characterized by comprising the full tab pole piece of any of claims 1-12 wound around the porous core (7).