Insulating glue for lithium ion batteries and using method of insulating glue

Abstract

The invention provides insulating glue for covering exposed lug metal in the electrode assembling process of coiled lithium ion batteries and a using method of the insulating glue. The insulating glue comprises the following components in mass percentage: 20-60% of epoxy resin, 12-15% of epoxy resin curing agent, 5-15% of epoxy propane butyl ether, 3-10% of triethanolamine, 15-30% of quartz powder and 5-10% of white carbon black. The insulating glue is a naturally dried artificial rubber coating which can be easily sprayed, brushed or soaked; and the insulating glue is suitable for the insulating protection of metal exposed parts of the lithium ion batteries without influencing the properties of the lithium ion batteries, low in cost, simple and easy for operation, excellent in an insulating effect, safe and reliable.

Description

technical field [0001] The present invention relates to the technical field of insulation of lithium-ion batteries, in particular, to the insulation technology for the local tab metal exposure after electrode winding in the preparation of lithium-ion batteries, and further relates to the electrode assembly process of wound-type lithium-ion batteries, covering Insulating glue for exposed tab metal and methods of use thereof. Background technique [0002] After the lithium-ion battery is assembled, the dressing area of ​​the negative electrode must exceed the dressing area of ​​the positive electrode in both length and width directions to ensure the capacity and safety performance of the battery. Therefore, in the width direction of the electrode, the width of the positive electrode It must be smaller than the width of the negative pole piece. After the pole piece is welded to the metal lug, some metal in the positive pole piece will exceed the width of the positive pole piece...

AI Technical Summary

Problems solved by technology

In order to avoid serious safety problems such as short-circuit heating and burning of the battery caused by the welding position of the tabs on the head of the positive and negative electrodes contacting after assembly, the industry generally uses a green glue to cover the part, but this kind of green glue is expensive. The process is complicated and the efficiency is low. During the operation of green glue coating, the exposed metal parts cannot be completely covered. This operation still has a large safety hazard caused by failure.