Method for producing laminated battery

Abstract

The invention relates to a method for producing a laminated battery. The method comprises the following steps: taking a positive plate, a negative plate (material) and a belt-shaped diaphragm for standby use; applying a glue liquid on one side of the positive plate as well as that of the negative plate, and carrying out baking and rolling for standby use; cutting the obtained positive plate and the obtained negative plate into a plurality of standard-sized positive uniwafers and a plurality of standard-sized negative uniwafers; arranging the positive uniwafers uniformly on one side of the belt-shaped diaphragm, while arranging the negative uniwafers on the other side of the belt-shaped diaphragm in such a manner that the negative uniwafers and the positive uniwafers are opposite to each other; fixing the positive uniwafers and the negative uniwafers on two sides of the belt-shaped diaphragm according to a thermal compounding method; folding the complex of the positive uniwafers, the diaphragm and the negative uniwafers in a Z-shaped manner to form a battery roll core, and then carrying out assembling, liquid injection, formation and capacity grading to obtain the laminated battery. The method provided by the invention has the advantages that the battery production efficiency is improved; the problem that electrode uniwafers in a spirally wound laminated battery are not in close contact is solved; the safety performance of the laminated battery is improved.

Description

[0001] technical field [0002] The invention relates to the technical field of lithium ions, in particular to a method for manufacturing a laminated battery. Background technique [0003] Lithium-ion batteries have the advantages of high energy density, long cycle life, small self-discharge, and no memory effect. Since their commercialization, they have received extensive attention and applications. [0004] At present, there are two main production methods of lithium-ion batteries: winding type and laminated type. The winding battery is to make the positive electrode sheet and the negative electrode sheet into continuous long sheets, separated by a separator in the middle, and then made into a battery core by winding. This kind of traditional winding lithium-ion battery has the problem of stress concentration in the place where the pole piece is bent. The long-term accumulation of expansion and contraction of the pole piece caused by charging and discharging may cause def...

AI Technical Summary

Problems solved by technology

The battery core formed by winding laminated batteries in one direction is elliptical in cross-section, which will lead to loose contact between electrode monomers and electrode monomers, which will affect the performance of the battery

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