Pole piece structure for improving infiltration of lithium ion battery in thermal compounding process

Abstract

The invention relates to the field of pole piece structures of lithium ion batteries, and discloses a pole piece structure for improving infiltration of a lithium ion battery in a thermal compounding process in order to solve the problem that the infiltration effect of electrolyte on a pole piece is poor in a hot pressing process in the prior art, the pole piece comprises a current collector, a material area and gluing areas, and the gluing areas are located at the two ends of the two sides of the current collector. The material area is located in the middle area of two sides of the current collector. According to the invention, the glued pole piece is used for replacing the original glued diaphragm, the cohesiveness between the pole piece and the diaphragm is good, the infiltration of the electrolyte on the pole piece is facilitated, the liquid injection amount can be reduced, the formation infiltration time can be shortened, meanwhile, the lamination efficiency is high, the production efficiency in a thermal compounding process is improved, the productivity can be improved, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of pole piece structures of lithium ion batteries, in particular to a pole piece structure for improving the infiltration of lithium ion batteries by thermal recombination process. Background technique [0002] A lithium-ion battery is a secondary battery that mainly relies on the movement of lithium ions between the positive electrode and the negative electrode for charging and discharging. In the assembly process of lithium-ion batteries, the thermal recombination process is an important part. The thermal compounding process is a lamination process in which the pre-cut positive and negative electrode sheets are placed on the upper and lower layers of glued diaphragms, and a certain temperature and pressure are applied to them to make them composite into a whole. In the existing thermal recombination process of lithium-ion batteries, a separator coated with a viscous material on both sides is used to bond the pole p...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem of the poor wetting effect of the electrolyte on the pole piece by the hot pressing process in the prior art, the present invention provides a pole piece structure that improves the wetting of the lithium-ion battery thermal composite process, and the invention can improve the wetting effect of the electrolyte , thereby reducing the amount of liquid injection and shortening the time of formation and infiltration, reducing costs

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