Lithium ion battery negative electrode piece packaged integrally by using diaphragm paper through coating and hot melting

Abstract

The invention provides a lithium ion battery negative electrode packaged integrally by using diaphragm paper through coating and hot melting. The lithium ion battery negative electrode comprises a lithium ion battery negative electrode piece, wherein the negative electrode piece is coated by two layers of diaphragm paper which is slightly larger than the negative electrode piece, and hot-molten around the diaphragm paper, and the diaphragm paper and the negative electrode piece are packaged integrally to form the lithium ion battery negative electrode, and an opening is formed in one end head of the lithium ion battery negative electrode packaged integrally and is positioned in one side of the diaphragm paper. According to the lithium ion battery negative electrode, the negative electrode piece is completely coated by adopting the diaphragm paper, and hot-molten around the diaphragm paper, the negative electrode piece and the diaphragm paper are packaged integrally to form the lithium ion battery negative electrode; then the lithium ion battery negative electrode and a positive electrode pole piece are coiled to form a battery cell. Because the negative electrode piece is coated by the diaphragm paper, and then is hot-molten and packaged, the battery cell is not in contact with the positive electrode pole piece when being coiled, so that the short circuit hidden danger inside the battery cell is eliminated, and the safety and reliability of the battery are improved. The lithium ion battery negative electrode has a good popularization and reference function to the manufacture of similar lithium ion battery cells.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, relates to a lithium-ion battery assembly, and in particular to a battery negative plate suitable for winding lithium-ion battery cores, wrapped with separator paper and packaged as a whole with hot-melt packaging. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large capacity, long cycle life, no memory effect, light weight, and wide operating range. At present, the market has higher and higher requirements for the performance indicators of lithium-ion batteries. It is not only reflected in the battery capacity The requirements for the battery are getting higher and higher, and the safety performance requirements for the battery in the terminal are also higher. As everyone in the industry knows, a lithium-ion battery includes a casing, a cover plate assembly, a battery core, and an electrolyte. The lithium-ion battery and the cover plate ass...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of lithium ion battery core that is suitable for winding, the battery negative plate that wraps with separator paper, it adopts separator paper to cover negative electrode piece completely, then carries out hot-melt around separator paper, negative electrode piece and The negative electrode of the lithium-ion battery packaged together with the separator paper effectively solves the problem that the existing lithium-ion battery core is in partial contact with the positive electrode sheet when it is wound, which causes a hidden short circuit inside the battery core and seriously affects the safety of the battery.

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