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Optical fiber laser welding method for double-layer tabs and bar sheet

A fiber laser, welding method technology, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of high production cost, complex battery structure design, difficult manufacturing and processing, etc., and achieve reliable welding. Effect

Pending Publication Date: 2021-07-16
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This restriction on the material of tabs and tabs makes the structural design of the battery extremely complex, difficult to manufacture and process, and high in production costs.

Method used

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  • Optical fiber laser welding method for double-layer tabs and bar sheet
  • Optical fiber laser welding method for double-layer tabs and bar sheet

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

[0025] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two ...

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Abstract

The invention belongs to the technical field of battery manufacturing, and particularly relates to an optical fiber laser welding method for double-layer tabs and a bar sheet. The method comprises the steps that (S1) the copper bar sheet, the copper tab and the aluminum tab are placed in sequence from bottom to top, the copper bar sheet, the copper tab and the aluminum tab are clamped through a clamp, and predetermined welding positions are arranged on the copper bar sheet, the copper tab and the aluminum tab; and (S2) a laser beam is emitted to the welding positions through a welding head of an optical fiber laser, the laser beam is a continuous wave, and the wavelength is 1064nm. The welding is conducted for the first time, the laser power ranges from 1500w to 1800w, and the welding speed ranges from 120mm / s to 150mm / s; and then the welding is conducted for the second time, the laser power ranges from 1000w to 1200w, and the welding speed ranges from 150mm / s to 180mm / s. Protective gas is conveyed to the welding positions in the welding process. According to the method, the reliable welding among the copper bar sheet, the copper tab and the aluminum tab can be realized.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a method for welding double-layer tabs and pads with optical fiber laser. Background technique [0002] Laser welding is a high-efficiency and high-precision welding method that uses a high-energy-density laser beam as a heat source. The laser welding process is a heat conduction type, that is, the laser radiation heats the surface of the workpiece, and the surface heat diffuses to the inside through heat conduction. By controlling parameters such as laser pulse width, energy, peak power and repetition frequency, the workpiece is melted to form a specific molten pool. The principle of laser welding can be divided into heat conduction type and deep penetration welding. When the power density is less than 104-105w / cm2, it is heat conduction welding. At this time, the penetration depth is shallow and the welding speed is slow. When the power density is g...

Claims

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Application Information

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IPC IPC(8): B23K26/21B23K26/14B23K103/18
CPCB23K26/21B23K26/14B23K2103/18
Inventor 刘民一孟令洋张馨月王科李功洁
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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