▎ 摘　　要

NOVELTY - Improvement of thermal abuse safety performance of soft-packaged lithium-ion battery comprises using soft-packaged lithium-ion battery containing aluminum-plastic packaging shell; using a thin tape to completely cover the exposed empty foil area on the head of a misaligned structure's positive pole and using a thin tape to completely cover the bare empty foil area on the head of the staggered structure's negative pole when making the pole piece; using the positive and negative pole tabs that have been trimmed on the tab metal strip to weld the tabs; controlling width of reserved position on the inner side of the top seal to 0.8-3.0 mm and width of the reserved position on the inner side of the side seal to 0.5-2.0 mm and controlling reserved position on the inner side of the second seal during air extraction to 0.5-2.0 mm; and using ceramic separator with a smaller thermal shrinkage rate as the separator for the positive and negative electrodes. USE - The method is used for improving thermal abuse safety performance of soft-packaged lithium-ion battery. ADVANTAGE - The method greatly improves the heat abuse test passing rate of the battery model number of the gas produced in the process of testing the heat abuse rapidly. DETAILED DESCRIPTION - Improvement of thermal abuse safety performance of soft-packaged lithium-ion battery comprises using soft-packaged lithium-ion battery containing aluminum-plastic packaging shell as inner core. The material of the aluminum-plastic packaging shell is nylon/aluminum foil/polypropylene aluminum-plastic composite film or polyethylene terephthalate/nylon/aluminum foil/polypropylene aluminum-plastic composite film. The inner core is a winding structure, containing positive and negative plates and separator film. The positive electrode sheet contains a current collector, two auxiliary material layers attached to the two coating surfaces of the current collector, and positive electrode tab. The positive current collector is aluminum foil and the positive auxiliary material layer contains a positive electrode active material, a binder, and a conductive agent. The positive electrode active material is lithium cobalt oxide, lithium nickel cobalt manganate, lithium manganate, lithium nickel cobalt aluminate, and/or lithium iron phosphate. The positive electrode binder is polyfluoroethylene and PTFE. The positive electrode conductive agent is o conductive carbon black, carbon nanotube, conductive graphite, and/or graphene. The negative electrode sheet contains a current collector, two auxiliary material layers attached to the two coating surfaces of the current collector, and a negative electrode tab. The negative current collector is copper foil and the negative auxiliary material layer contains a negative active material, a thickener, and a binder. The negative electrode active material is artificial graphite, natural graphite, hard carbon, soft carbon and/or silicon carbon. The negative electrode thickener is sodium carboxymethyl cellulose and/or lithium carboxymethyl cellulose lithium. The negative electrode binder is styrene-butadiene rubber, acrylonitrile multi-copolymer, or acrylic multi-copolymer. The negative electrode conductive agent is conductive carbon black, carbon nanotubes, and graphene. The auxiliary material surface has a section of empty foil area without dressing, and the absolute value of the difference between the lengths of the upper and lower empty foil areas of the same pole piece head is greater than 5 mm. The method is done by using a thin tape to completely cover the exposed empty foil area on the head of a misaligned structure's positive pole and using a thin tape to completely cover the bare empty foil area on the head of the staggered structure's negative pole when making the pole piece; using the positive and negative pole tabs that have been trimmed on the tab metal strip to weld the tabs; controlling width of reserved position on the inner side of the top seal to 0.8-3.0 mm and width of the reserved position on the inner side of the side seal to 0.5-2.0 mm and controlling reserved position on the inner side of the second seal during air extraction to 0.5-2.0 mm; and using ceramic separator with a smaller thermal shrinkage rate as the separator for the positive and negative electrodes.