Lithium-ion battery zigzag lamination equipment and process thereof

Abstract

The invention discloses a lithium ion battery zigzag stacking equipment and its technology. The lithium ion battery zigzag stacking equipment includes: a diaphragm, a plurality of negative electrode plates are arranged on the upper surface of the diaphragm at regular intervals, and a plurality of negative electrode plates are arranged on the lower surface of the diaphragm. A positive electrode sheet; a hot-press composite device; a separator cutting device; a lamination mechanism, and the zigzag lamination process of a lithium-ion battery includes the following steps: (1) die-cut or cut the positive roll and the negative roll first, and then place them on the diaphragm The upper surface and the lower surface are respectively bonded with die-cut or cut negative electrode sheets and positive electrode sheets, and the positive electrode sheets and negative electrode sheets are alternately distributed; (2) Then the separator is thermally pressed and composited with each negative electrode sheet and positive electrode sheet; (3 ) and finally carry out zigzag folding and cut the diaphragm. The invention realizes seamless docking between die-cutting or cutting and zigzag laminations, saves the pole piece transfer device and facilities, and fixes the pole piece by hot-compression composite method, which reduces the dislocation of the pole piece during the transfer process of the bare cell risks of.

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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