CN216250844U

CN216250844U - Lithium ion battery suitable for increase welding strength

Info

Publication number: CN216250844U
Application number: CN202122637506.1U
Authority: CN
Inventors: 陈道明; 张纬阳; 刘宏强; 朱玉娇
Original assignee: Hefei Guoxuan High Tech Power Energy Co Ltd
Current assignee: Hefei Gotion High Tech Power Energy Co Ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-04-08
Anticipated expiration: 2031-10-28

Abstract

The utility model discloses a lithium ion battery suitable for increasing welding strength, which comprises a battery cover plate, a pole column and a battery roll core, wherein one end of the pole column is fixed on the battery cover plate, the other end of the pole column is fixed at the output end of the battery roll core, the pole column is provided with nicks, and the nicks are arranged on the outer surface of the pole column; the service life of the equipment is prolonged due to the arrangement of the nicks, metal dust generated during welding is reduced, foreign matters are reduced, and the consistency and the safety of the lithium ion battery are improved.

Description

Lithium ion battery suitable for increase welding strength

Technical Field

The utility model relates to the technical field of lithium battery preparation, in particular to a lithium ion battery suitable for increasing welding strength.

Background

The current lithium ion battery roll core mainly comprises a full lug mode and a multi-lug mode, wherein the full lug mode is widely applied to 48V systems and HEVs due to good power performance, and due to the structural characteristics, in order to enhance the overcurrent capacity, the thickness of a current collector used by a power type battery cell is thicker than that of an energy type battery cell, the thicknesses of a positive pole, a negative pole and a connecting piece of a used structural component are thicker than that of a conventional energy type battery cell, in order to improve the welding effect, the required energy, power, time and pressure during ultrasonic welding can be obviously improved, and the service life of equipment is greatly shortened; and metal debris brought by ultrasonic welding in high energy, high power, long time and high pressure are not beneficial to reducing self-discharge of the battery core by the battery core, and the consistency is poor.

SUMMERY OF THE UTILITY MODEL

Based on the technical problems in the background art, the utility model provides the lithium ion battery suitable for increasing the welding strength, so that the service life of equipment is prolonged, metal dust generated during welding is reduced, foreign matters are reduced, and the consistency and safety of the lithium ion battery are improved.

The utility model provides a lithium ion battery suitable for increasing welding strength, which comprises a battery cover plate, a pole column and a battery roll core.

Further, the pole column comprises a positive pole column and a negative pole column, wherein a first nick is formed on the outer surface of the positive pole column, and a second nick is formed on the outer surface of the negative pole column.

Further, the first score and the second score are formed by punching and molding through a die.

Further, the first score and the second score are line structures, circular structures, oval structures, square structures or irregular shapes.

Furthermore, the depth of the first notch on the positive pole is 0.1-0.3mm, and the depth of the second notch on the negative pole is 0.1-0.3 mm.

Further, the battery cover plate and the pole are integrally formed.

Further, the thickness of the pole is 2-4 mm.

The lithium ion battery suitable for increasing the welding strength provided by the utility model has the advantages that: according to the lithium ion battery suitable for increasing the welding strength, provided by the structure, the surface of the welding position of the pole column is subjected to certain nicking treatment, so that the surface welding area between the pole column and the battery roll core is increased, the welding staggered depth is deepened, the welding effect is improved, and the service life of equipment is prolonged; meanwhile, metal dust generated during welding can be reduced, foreign matters are reduced, the problem that self-discharge of the battery cell is high due to metal scraps and dust in the ultrasonic welding process is effectively solved, and the consistency and safety of the lithium ion battery are improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

the battery comprises a battery cover plate 1, a pole 2, a nick 4, a positive pole 21, a negative pole 22, a first nick 41 and a second nick 42.

Detailed Description

The present invention is described in detail below with reference to specific embodiments, and in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

As shown in fig. 1, the lithium ion battery suitable for increasing the welding strength provided by the utility model comprises a battery cover plate 1, a pole post 2 and a battery roll core, wherein one end of the pole post 2 is fixed on the battery cover plate 1, the other end of the pole post 2 is fixed at the output end of the battery roll core, the pole post 2 is provided with a notch 4, and the notch 4 is arranged on the outer surface of the pole post 2.

Carry out certain nick through the surface to utmost point post 2 and handle to at utmost point post 2 and the contact department that the battery rolled up the core, nick 4 is little relatively, increases the surface weld area between utmost point post 2 and the battery rolled up the core, deepens the crisscross degree of depth of welding, promotes the welding effect. Therefore, the notch 4 can effectively reduce the welding parameters such as energy, power, time, pressure and the like required during welding, reduce the energy consumption of equipment and prolong the service life of the equipment. Meanwhile, metal dust generated during welding can be reduced, foreign matters are reduced, the problem that self-discharge of the battery cell is high due to metal scraps and dust in the ultrasonic welding process is effectively solved, and the consistency and safety of the lithium ion battery are improved.

Wherein can set up dust removal mechanism when the welding to the dust that produces when further reducing the welding has improved the dustless environment of welding.

In the lithium cell, the battery rolls up the core and has two outputs: the positive pole end and the negative pole end, therefore the post 2 includes a positive pole post 21 and a negative pole post 22, the positive pole post 21 and the negative pole post 22 are respectively welded with the corresponding output end of the battery roll core, a first nick 41 is formed on the outer surface of the positive pole post 21, and a second nick 42 is formed on the outer surface of the negative pole post 22.

When setting up the nick on positive post 21 and negative pole post 22, can realize through mould stamping forming, the first nick 41 and the second nick 42 that process out can be for shapes such as line structure, circular structure, oval structure, square structure or irregular shape to improve the surface weld area between utmost point post 2 and the battery roll core, deepen the crisscross degree of depth of welding, promote the welding effect.

Specifically, battery cover plate 1 and utmost point post 2 integrated into one piece, positive post 21 and negative pole post 22 are fixed in the homonymy both ends of battery cover plate 1 respectively, and battery cover plate 1, positive post 21 and negative pole post 22 integrated into one piece to increase the structural strength of whole lithium cell.

In the present embodiment, the thickness of the positive and

negative posts

21 and 22 may be set to 2-4 mm. The depth of the first notch 41 on the positive pole 21 is 0.1-0.3mm, the depth of the second notch 42 on the negative pole 22 is 0.1-0.3mm, wherein the notch depth is not too shallow, the welding effect in time period is poor due to low welding energy, low welding power and low welding pressure when the notch depth is too shallow, the notch depth is not too deep, and the overcurrent capacity of the pole is poor when the notch depth is too deep, so that the welding effect is influenced, and the power of the battery cell is reduced.

For the sake of operational safety, the surface of the score 4 is subjected to surface treatment so that the surface of the score 4 feels smooth and free of burrs.

As a specific example:

example 1: the thickness of the positive pole 21 and the negative pole 30 is 2mm, the first nick 41 and the second nick 42 are in a strip structure, and the nick depth is 0.1 mm.

Example 2: different from the specific example 1, the shape of the nick is a circular structure, and the depth of the nick is 0.3 mm.

Comparative example: the mechanical structure and parameters were the same as those in example 1 except for the scoring.

Table 1: tensile force test result after ultrasonic welding of positive electrode of battery roll core

Experimental groups	Welding energy/J	Welding power/W	Welding pressure-MPa	Welding time/s	Tensile test/N
						Comparative example	240	1200	0.2	0.2	445
Example 1	180	800	0.15	0.15	562
						Example 2	175	750	0.15	0.15	573

Table 2: tensile force test result after ultrasonic welding of battery roll core cathode

Experimental groups	Welding energy/J	Welding power/W	Welding pressure-MPa	Welding time/s	Tensile test/N
						Comparative example	980	3500	0.3	0.3	340
Example 1	540	2400	0.25	0.2	462
						Example 2	520	2150	0.25	0.2	475

Welding energy, welding power, welding pressure and welding time for forming the nicks on the pole 2 can be intuitively obtained through the table 1 and the table 2, and meanwhile, final tension tests are improved to some extent compared with the test without the nicks, and the welding effect is improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. The utility model provides a lithium ion battery suitable for increase welding strength, includes battery apron (1), utmost point post (2) and battery roll core, its characterized in that, utmost point post (2) one end is fixed in on battery apron (1), the other end is fixed in battery roll core output, has seted up nick (4) on utmost point post (2), and nick (4) set up in utmost point post (2) surface.

2. The lithium ion battery suitable for increasing the welding strength according to claim 1, wherein the pole post (2) comprises a positive pole post (21) and a negative pole post (22), a first notch (41) is formed on the outer surface of the positive pole post (21), and a second notch (42) is formed on the outer surface of the negative pole post (22).

3. The lithium ion battery suitable for increasing the welding strength according to claim 2, characterized in that the first score (41) and the second score (42) are formed by die stamping.

4. The lithium ion battery suitable for increasing the welding strength according to claim 3, wherein the first score (41) and the second score (42) are line structures, circular structures, elliptical structures, square structures or irregular shapes.

5. The lithium ion battery suitable for increasing the welding strength according to claim 3, wherein the first notch (41) has a depth of 0.1-0.3mm on the positive post (21), and the second notch (42) has a depth of 0.1-0.3mm on the negative post (22).

6. The lithium ion battery suitable for increasing the welding strength according to any one of claims 1 to 5, characterized in that the battery cover plate (1) and the pole post (2) are integrally formed.

7. The lithium ion battery suitable for increasing the welding strength according to any of the claims 1 to 5, characterized in that the pole (2) has a thickness of 2-4 mm.