Method for lithium battery injection molding encapsulation

Abstract

A method for packaging lithium cell by injecting plastic. A face cover of a electric core assembly can be formed by this method. The electric core assembly may be a lithium ion electric core assemblyor a polymer electric core assembly, wherein the polymer electric core assembly was packaged by a metal flake in advance. The method for packaging a lithium cell includes: providing the electric coreassembly with a output terminal into a cavity of a mould and locating therein with a location pin; melting thermoplastic polyamide resin desired to be inject at 170 to 230 degrees Centigrade, to makethe viscosity of the thermoplastic polyamide resin in the range of 340OmPa s to 10,000 mPa s; injecting the said molten thermoplastic polyamide resin into the cavity of the metal mould at the pressureof the injecting plastic in the range of 1 MPa to 10MPa, so as to inject the said thermoplastic polyamide resin into the cavity of the metal mould and coat onto the front face of the electric core assembly to form a plastic face cover.

Description

technical field [0001] The invention relates to the technical field of an injection molding method, in particular to a method for plastic-packaging an electric core assembly. Background technique [0002] As people's awareness of environmental protection increases day by day, the use of toxic metals such as lead and cadmium is increasingly restricted, and research and development of lithium-ion batteries has become the general trend. Lithium-ion batteries are a new generation of chemical power sources that stood out in the 1990s. Due to their excellent electrochemical performance and non-polluting characteristics, they have become ideal supporting power sources for various advanced portable electronic products. [0003] Lithium-ion batteries are divided into polymer lithium-ion batteries and liquid lithium-ion batteries. The biggest difference between polymer lithium-ion batteries and liquid lithium-ion batteries is that they use different electrolytes. Liquid lithium-ion b...

AI Technical Summary

Problems solved by technology

The thickness of the plastic shell battery in this injection molding package is increased, and the injection molding is easy to form burrs. At the same time, when the molten resin material contacts the battery in the metal mold during injection molding, the battery in the shell will be damaged.

For the injection molding method of packaging lithium batteries, there is also a low-pressure injection molding of about 0.3-0.6MPa. Although this low-pressure injection molding can avoid damage and reduce the burrs generated by injection molding, the low-pressure injection molding of this order of magnitude requires the accuracy of injection molding equipment and its process requirements. are very high, general equipment is difficult to meet the requirements

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