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Tab welding method, battery cell tab and battery

A pole-ear welding and pole-ear technology, which is applied in the manufacture of primary batteries, welding equipment, and secondary batteries, can solve the problems of poor overcurrent capability at the laser welding position, weakened overcurrent capability at the welding position, and insufficient tensile strength. , to achieve the effect of strong overcurrent capability, small internal resistance and high reliability

Pending Publication Date: 2021-12-07
EVE ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, because ultrasonic welding is non-melting welding, it can only make the surface of the parts adhere, so the tensile strength of the welding position is not enough, and the flow capacity is also poor
Although laser welding is fusion welding, which can melt and combine the foil and the metal strip, the metallographic analysis of the solder joints found that when the laser is irradiated vertically from the side of the metal strip to form an impact crater, the foil and the metal strip at the solder joints will form impact craters. The metal strip is melted, but the foil at the edge of the welding point is obviously broken, which will weaken the flow capacity of the welding position, making the laser welding position have a hidden danger of poor flow capacity

Method used

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  • Tab welding method, battery cell tab and battery
  • Tab welding method, battery cell tab and battery
  • Tab welding method, battery cell tab and battery

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Such as figure 1 As shown, this embodiment provides a tab welding method for connecting tabs in pouch batteries. The tab welding method includes the following steps:

[0046] S1. Ultrasonic pre-welding is performed on the first side of the first welding zone of the tab foil 1 .

[0047] That is, firstly, the first side of the first welding zone of the tab foil 1 is ultrasonically welded. Specifically, the first side of the first welding area of ​​the tab foil 1 is pre-welded with the ultrasonic welding head, and the welding position is shaped to make the surface of the welding position smooth, which is convenient for subsequent air gap removal and welding, It is beneficial to improve the welding strength and improve the welding quality. Preferably, in this embodiment, the size of the welding head used for ultrasonic pre-welding of the tab foil 1 is 0.2mm*0.2mm, and the distance between two adjacent welding points is 0.5mm. The welding head of this size and The distan...

Embodiment 2

[0070] This embodiment also provides a tab welding method for the connection of tabs in pouch batteries. The difference between this embodiment and Embodiment 1 is that: Figure 4 As shown, the main laser welding is a strip-shaped laser welding, that is, the main laser welding forms a strip-shaped second welding scar 5 on the first side of the welding area of ​​the metal strip 2 .

[0071] Preferably, the welding point center of laser main welding moves along the line connecting the welding spot 3 centers of ultrasonic welding main welding, and the welding path of laser main welding passes through the center of welding spot 3 of ultrasonic welding main welding, which can make the second welding scar The projection of 5 on the first side of the tab foil 1 passes through the first welding scar 3, and the materials at the second welding scar 5 and the first welding scar 3 can be fully fused together, further improving the welding strength and welding quality.

[0072] This embodi...

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Abstract

The invention relates to the technical field of welding, and discloses a tab welding method, a battery cell tab and a battery. The tab welding method comprises the following steps of S1, carrying out ultrasonic welding pre-welding on a first side of a first welding area of a tab foil; S2, carrying out main ultrasonic welding on the tab foil and a metal strip on the first side of a second welding area of the tab foil, so that an air gap between the tab foil and the metal strip is removed; and S3, carrying out main laser welding on the tab foil and the metal strip on the first side of the welding area of the metal strip. By means of the tab welding method, the tab foil breakage phenomenon can be improved, the overcurrent capacity of the welding position is improved, and the welding reliability is improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a tab welding method, a battery tab and a battery. Background technique [0002] At present, the connection method of pouch battery tabs is mainly welding, and the main welding methods are ultrasonic welding and laser welding. Laser welding is fusion welding, and the electronic transition barrier at the welding position is smaller than that at the ultrasonic welding position. Laser welding has a tendency to replace ultrasonic welding. Among them, because ultrasonic welding is non-melting welding, it can only make the surface of the parts adhere, so the tensile strength of the welding position is not enough, and the flow capacity is also poor. Although laser welding is fusion welding, which can melt and combine the foil and the metal strip, the metallographic analysis of the solder joints found that when the laser is irradiated vertically from the side of the metal strip to form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02H01M6/00H01M10/04H01M50/531
CPCB23K28/02H01M50/531H01M6/00H01M10/04Y02P70/50
Inventor 闫俊杰卢海燕刘金成何巍宋鹏元陈校军
Owner EVE ENERGY CO LTD
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