Lithium ion battery plastic-aluminum membrane heat-sealing technology

Abstract

The invention discloses a lithium ion battery plastic-aluminum membrane heat-sealing technology, and solves the problems that sealing edges of a plastic-aluminum membrane heat-sealed by a lithium ion battery plastic-aluminum membrane heat-sealing technology in the prior art are easy to wrinkle, poor in smoothness, and inconsistent in heat sealing strength. The lithium ion battery plastic-aluminum membrane heat-sealing technology comprises of top sealing and side sealing of the plastic-aluminum membrane, the top sealing and side sealing of the plastic-aluminum membrane comprises of primary top sealing and secondary top sealing, and the side sealing of the plastic-aluminum membrane comprises of primary side sealing and secondary side sealing. According to the lithium ion battery plastic-aluminum membrane heat-sealing technology, on the basis of determined optimal top sealing process parameters and optimal side sealing process parameters, step-by-step top sealing and side sealing are used, top sealing process parameters and side sealing process of parameters each step are adjusted and optimized, the problems that the sealing edges of the plastic-aluminum membrane sealed by primary top sealing and side sealing in the prior art are easy to wrinkle, poor in smoothness, and inconsistent in heat sealing strength for the reason that a completely melted CPP layer material is extruded out from the plastic-aluminum membrane are effectively resolved, and the plastic-aluminum membrane prepared by the lithium ion battery plastic-aluminum membrane heat-sealing technology is smooth in surface, uniform in thickness, and good in heat sealing strength.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium-ion batteries, in particular to a heat-sealing process for aluminum-plastic films of lithium-ion batteries. Background technique [0002] Aluminum-plastic film is the outer packaging material for soft-pack lithium batteries. The commonly used aluminum-plastic film structures are as follows: figure 1 As shown, it is mainly composed of extended nylon layer 1 (ON layer), aluminum foil layer 2 (AL layer) and cast polypropylene film layer 3 (CPP layer) from top to bottom. When making soft-pack lithium-ion batteries The aluminum-plastic film needs to be heat-sealed with a heat-sealing machine to form the outer package. The quality of the heat-sealing will directly affect the service life of the battery. [0003] The heat sealing of the aluminum plastic film includes top sealing and side sealing. The so-called top sealing is to heat seal the side of the aluminum plastic film on the side (u...

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to solve the problems that the heat-sealed aluminum-plastic film edge is prone to wrinkles, poor flatness and inconsistent heat-sealing strength in the heat-sealing process of the aluminum-plastic film of the lithium-ion battery in the prior art, and provides a lithium-ion battery aluminum Plastic film heat-sealing process, the process steps are simple, and the aluminum-plastic film after heat-sealing has good edge sealing and heat-sealing strength

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