Lithium ion battery core package, lithium ion battery and preparation method of lithium ion battery

Abstract

The invention relates to the field of lithium ion battery preparation, and discloses a lithium ion battery core package, a lithium ion battery and a preparation method of the lithium ion battery. Thelithium ion battery comprises a core package, and the lithium ion battery comprises a positive plate, a negative plate and a diaphragm arranged between the adjacent positive plate and negative plate at interval; a positive tab welding part and a negative tab welding part extend out of the lithium ion battery core package; a positive tab and a negative tab are respectively welded on one surface ofthe positive tab welding part and one surface of the negative tab welding part; the surfaces of the positive tab and the negative tab and the welding areas of the positive tab welding part and the negative tab welding part are coated with a glue solution, the glue solution is cured into a glue body which is combined with the welding areas into a whole, and the welding areas are tightly wrapped inthe glue body. By applying the technical scheme, the protection on the welding mark area of the tab welding part is improved, welding slag at the welding mark area is prevented from corroding the welding mark area and piercing high-temperature glue, and short circuit caused by falling of the welding slag, piercing of an inner-layer aluminum-plastic film by the welding slag or burrs and the like isavoided, so the safety and the stability of the lithium ion battery are improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery preparation, and discloses a lithium ion battery core pack, a lithium ion battery and a preparation method for the lithium ion battery. Background technique [0002] With the promotion of the global environmental protection concept, new energy electric vehicles are gradually entering the mass market. How to improve the safety performance of new energy vehicles has become a technical problem in the industry. Laminated lithium-ion batteries are the main format of lithium-ion batteries. The lamination is mainly to die-cut the positive electrode and negative electrode into specified sizes, and then laminate the positive electrode, negative electrode, and separator in a "Z" shape to form a lithium battery. Core pack, and then weld the positive tab on the tab welding part (positive tab welding part) that protrudes outside the lithium-ion battery core pack and is integrated with the current collector o...

AI Technical Summary

Problems solved by technology

However, the present inventors found in the research process of the present invention that the prior art has the following defects: the solid glue layer in the high-temperature adhesive tape 2 with a thickness of about 50um is only about 25um, and when the adhesive tape 2 and the welding area 1 are displaced In this case, the burrs and welding slag on the surface of the welding area 1 are easy to pierce the high-temperature tape 2, which makes it difficult for the high-temperature tape 2 to play a protective role in practical applications.

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