Insulation glue for lithium metal batteries and preparation method thereof

Abstract

The invention discloses insulation glue for lithium metal batteries and a preparation method thereof. The insulation glue for the lithium metal batteries are prepared from epoxy resin, organic silicon resin, nitrile rubber, polyvinyl butyral resin, an epoxy reactive diluent, anhydride, an inorganic filler, an antioxidant, a curing agent, a bifunctional reactive diluent, a plasticizer, a solvent, a coupling agent, a phosphorus-containing flame retardant, a nitrogen-containing flame retardant, acrylic acid, polyvinyl alcohol and sodium dodecyl benzene sulfonate. The plasticizer is prepared from dibutyl phthalate, tributyl phosphate, tri(2-chloroethyl)phosphate, polyester and polyether. The insulation glue has good electric insulation performance, thermal conductivity, high heat resistance and low cost, can be easily sprayed, brushed or dipped, has moisture-proof, acid-proof, friction-resisting, corrosion-resisting properties and other properties, have the good sealing and insulating performance effects on coated positions, is suitable for the insulation precaution of exposed parts of lithium-ion metal batteries, has no effect on the properties of the lithium-ion metal batteries completely and is safe and reliable.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to an insulating glue for lithium metal batteries and a preparation method 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, but within the coverage of the negative pole piece, it must appear beyond the positive pole piece during the winding assembly process Part of the positive tab metal is in contact with the edge of the negative plate. In order ...

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.