High-capacity small button-type lithium battery inner casing and insulating film fixing processing method

Abstract

A high-capacity small button-type lithium battery inner casing and insulating film fixing processing method comprises the following steps: 1, material selection: selecting a plastic material having athermal shrinkage property and electrolyte corrosion resistance as an insulating film, wherein the inner casing in a barrel shape; 2, section cutting: cutting the insulating film into sections according to the height of the inner casing to ensure that the length of the insulating film subjected to thermal shrinkage is greater than the height of the inner casing of the lithium battery; 3, sleeve: sleeving the inner casing with the insulating film; 4, heating: heating the insulating film in an oven in order that the insulating film thermally shrinks and coats the outer side of the inner casing;5, shaping: heating the insulating film to soften the same, and shaping a part of the insulating film inside the inner casing by a shaping column matching the inside of the inner casing in shape; and6, demolding: taking the shaping column out of the inner casing. According to the invention, the insulating film with a thin thickness can be attached to the inner casing of the lithium battery, and the overall thickness of the inner casing can be reduced, thereby realizing the insulation and sealing between the inner casing and the outer casing by using the insulating film structure.

Description

technical field [0001] The invention discloses a lithium battery, in particular to a high-capacity small button-type lithium battery inner case and an insulating film fixing processing method. Background technique [0002] Button cell (button cell), also known as button cell, refers to a battery that looks like a small button. Generally speaking, it has a larger diameter and a thinner thickness (compared to cylindrical batteries such as AA batteries on the market). Generally speaking, there are two types of button batteries, rechargeable and non-rechargeable. The non-rechargeable ones include 3V lithium-manganese button batteries and 1.5V alkaline zinc-manganese button batteries; the rechargeable ones include 3.6V rechargeable lithium-ion button batteries. And a 3V rechargeable lithium-ion button battery. [0003] A conventional lithium battery mainly includes an inner shell, an outer shell, and a battery core. The inner shell and the outer shell are fastened together, and ...

AI Technical Summary

Problems solved by technology

[0003] A conventional lithium battery mainly includes an inner shell, an outer shell, and a battery core. The inner shell and the outer shell are fastened together, and the battery core is arranged inside the inner shell. Since there is liquid in the battery core, when assembling a lithium battery, the inner shell needs to be The shell and the outer shell are sealed. The conventional button-type lithium battery is sealed with PVC sealing material on both sides of the inner shell side wall. According to the elasticity of the sealing material, the sealing effect between the inner shell and the outer shell is achieved. Conventional The overall thickness of the PVC sealing material can reach 1.2~1.4mm, and the total wall thickness of the inner shell and the outer shell is about 1.5mm, resulting in a small internal effective space of the product. In addition, due to the poor elasticity of the PVC material, the current lithium battery is caused by leakage. The defective rate of products is 20%~30%, and the rate of defective products is relatively high.

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