A lithium ion battery Z-shaped laminating device and process thereof

Abstract

A lithium ion battery Z-shaped laminating device and a process thereof are disclosed. That lithium ion battery Z-shaped laminating device comprises a diaphragm, a plurality of negative electrode pieces are uniformly arranged on the upper surface of the diaphragm, and a plurality of positive electrode pieces are arranged on the lower surface of the diaphragm; a hot-pressing compound device; a diaphragm cutting device; a lithium ion battery z-shape lamination process comprise that following steps of: (1) firstly die cutting or cutting the positive electrode roll and the negative electrode roll,then bonding the die-cut or cut negative electrode sheet and the positive electrode sheet on the upper surface and the lower surface of the diaphragm respectively, and performing staggered distribution of the positive electrode sheet and the negative electrode sheet; 2, hot pressing that diaphragm with each negative electrode sheet and the positive electrode sheet; (3) finally, Z-shaped folding and cutting the diaphragm. The invention realizes seamless butt joint between die-cutting or cutting and Z-shaped laminate, eliminates pole piece transfer device and equipment, and uses hot-pressing composite method to fix pole piece, thus reducing the risk of pole piece dislocation in the transfer process of bare cell.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a zigzag lamination device and a process for a lithium ion battery. Background technique [0002] Lithium-ion batteries are currently the most popular new energy storage devices, and in the battery assembly process, the assembly of bare cells is one of the most important processes. There are three basic requirements for bare cell assembly: 1. The negative electrode completely wraps the positive electrode; 2. The separator completely wraps the coating; 3. The electrodes are center aligned. Bare cell assembly technology is divided into two major technical routes: winding and lamination. The winding is also divided into full-tab winding and multi-tab winding, and the lamination is divided into pocket slicing and zigzag lamination. [0003] Z-shaped lamination technology is the simplest lamination process. First, die-cut or cut the positive and negative electrodes into single pie...

AI Technical Summary

Problems solved by technology

[0006] (1) The die-cutting or cutting process is separated from the stacking process. Under automated equipment, the pole piece transfer requires a long logistics line, and the purchase and maintenance costs are high; or the pole piece is transferred using a material box, which is inefficient ;

[0007] (2) After the bare cell is made in the lamination process, since there is no force between the pole piece and the diaphragm, the pole piece is easily misplaced before the tab is welded, posing a safety hazard

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