Manufacturing method of lithium ion battery high-compaction density pole plate

Abstract

The invention discloses a manufacturing method of a lithium ion battery high-compaction density pole plate. The pole plate comprises a metal current collector and a conducting mixed slurry; the conductive mixed slurry is coated on the metal current collector at twice or multiple times, the pole plate is dried and rolled after the first coating, and the plate is dried and then rolled after the second coating, the coating, the drying, and the rolling are orderly performed until the conducting mixed slurry is completely coated. The thickness of the conducting mixed slurry wet coating layer through twice or multiple coating is thinner than that of once coating process, the drying load is educed, the drying time is shortened, the single rolling load is reduced, the roll coating is hard to occurunder high rolling pressure, the coating uniformity and precision are improved, the compaction density of the pole plate is increased, so that the volumetric specific energy is increased, the internal resistance of the pole plate is reduced, the polarization is reduced, the discharge capacity is increased, the battery energy density is increased, the cost is reduced, the flexibility of the pole plate is guaranteed, and the phenomena that the surface is curly uneven and even the plate is broken or crisp are avoided.

Description

technical field [0001] The invention relates to the field of making battery pole pieces, in particular to a method for making high-pressure compacted density pole pieces of lithium-ion batteries. Background technique [0002] Lithium-ion batteries were first successfully developed and commercialized by Sony Corporation of Japan in 1990, with their advantages of high voltage, light weight, large specific energy, less self-discharge, long cycle life, no memory effect, and less environmental pollution. , has been developed rapidly, and the foot replaces secondary rechargeable batteries such as Ni-Nd, Ni-MH, and lead-acid, and becomes an indispensable mobile power source in life. [0003] The manufacturing process of lithium-ion batteries is more complicated, including: pulping, coating, sheeting, winding, assembly, liquid injection, standing, pre-full capacity, high temperature aging and other processes. The coating process is to use a coating machine to uniformly coat the met...

AI Technical Summary

Problems solved by technology

At the same time, the pole piece of the one-time coating process increases the rolling compound during rolling. When pursuing high compaction density, it is easy to stick to the roll under excessive rolling pressure, the pole piece becomes hard and flexible, the surface is curled and uneven, and even broken. Phenomena such as brittle chips affect product quality

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