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Method for applying nanosecond laser welding in pouch lithium battery

A nanosecond laser welding and soft-pack lithium battery technology, which is applied in laser welding equipment, welding equipment, battery assembly machines, etc., can solve the problems of low reliability and non-working hours of pretreatment process, so as to reduce production costs and save The effect of eliminating the pretreatment process and reducing the number of workers

Inactive Publication Date: 2017-08-18
重庆创元新能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pretreatment process has the disadvantages of non-working hours and low reliability

Method used

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Embodiment Construction

[0019] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0020] The present invention comprises the following steps:

[0021] 1) Sorting of batteries, bundling qualified batteries to form battery packs;

[0022] 2) Apply high-temperature glue and epoxy board to the battery pack, and pack and glue the battery pack;

[0023] 3) Use a washing machine to clean the welding surface of the conductive copper plate to prevent welding instability and welding perforation caused by surface dirt. When cleaning, first compile the running track to determine the route taken by the laser gun head; adjust the laser emission height to confirm that the best focal length is the place with the strongest energy; set the welding power to 30-80%; set the speed to 500-2000mm / min; confirm the above parameter to start cleaning. ...

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Abstract

The invention belongs to the technical field of power batteries for new energy vehicles, specifically relates to a method for applying nanosecond laser welding in a pouch lithium battery. The method comprises the steps of sorting cells and binding the cells into a cell group; processing the cell group through high temperature glue coating and epoxy board attaching, and encasing and gluing the cell group; cleaning a conductive copper plate through a laser cleaning machine; enabling the conductive copper plate to pass through a tab of the cell to form a module to be levelled; putting a plurality of the modules to be levelled into a pressing device, bending the tab of the cell, and pressing the conductive copper plate; welding the tab and the conductive copper plate by a nanosecond fibre-optical laser machine; and inspecting the quality of the welding. According to the method for applying nanosecond laser welding in a pouch lithium battery, the nanosecond fibre-optical laser machine is introduced into the field of welding, such that a pretreatment of aluminium-nickel conversion or aluminium-copper conversion before plating is omitted, and the application of nickel strips and red glue materials is cancelled, while the number of workers and the manufacturing cost are also reduced.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicle power batteries, and specifically relates to an application method of nanosecond laser welding in soft-pack lithium batteries. Background technique [0002] When the pouch battery packaged with aluminum-plastic film is assembled, since the positive electrode lug of the pouch battery is made of aluminum, copper-aluminum welding means that the copper material and the aluminum material are joined together through a welding process. Because both copper and aluminum are easy-to-oxidize metals, the welding of copper and aluminum has always been an international welding problem. It is impossible to perform effective laser welding with the connecting copper plates that form battery series and parallel connections. Pretreatment for nickel-to-nickel or aluminum-to-copper plating. The pretreatment process has the disadvantages of non-working hours and low reliability. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M2/20H01M2/22B23K26/22H01M50/516H01M50/528
CPCH01M10/0404B23K26/22H01M50/502H01M50/528Y02E60/10Y02P70/50
Inventor 周涛刘志彬段勇范鸣车友保刘权
Owner 重庆创元新能源科技有限责任公司
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