Method for improving safety of high-capacity lithium ion power battery

Abstract

The invention relates to a novel laminated mixed polymer gel lithium ion power battery which has high capacity, long cycle life, good high-low temperature performances, high specific energy and specific power and high safety. The formulation of a positive pole of the power battery provided by the invention comprises lithium iron phosphate, or lithium manganate, or ternary material, SP, flake graphite, LBG1, and a plasticizer, and the solvent is acetone; the formulation of a negative pole comprises artificial graphite, SP, LBG1, and the plasticizer, and the solvent is acetone; the formulation for processing a diaphragm comprises an adhesive, the plasticizer, ethyl acetate and acetone; and a double-positive one-negative structure is adopted for a monolithic electrical core of the power battery, two positive pole pieces are arranged on the two surfaces, a negative pole piece is sandwiched in the middle, an energy insulation layer is arranged between the positive pole pieces and the negative pole piece, and the size of the negative pole is slightly greater than that of the positive pole. Compared with the prior art, the novel monomer provided by the invention has high capacity, long cycle life and good high-low temperature performances.

Description

Technical field: [0001] The invention relates to a new type of large capacity, long cycle life, good high and low temperature performance, high specific energy and specific power, and high safety laminated hybrid polymer colloidal lithium ion power battery, which is especially suitable for the production process. In order to further improve A unique approach to the safety of its large-capacity single cells. Background technique: [0002] Energy and the environment are extremely important material foundations for the survival and development of human society. Since the formation of energy systems based on fossil fuels such as oil, coal and natural gas, countries around the world have greatly promoted the prosperity and progress of human society. However, with the painful lessons of various unfortunate disasters encountered by countries in the world today and the continuous improvement of human scientific prediction capabilities, villagers around the world increasingly feel th...

AI Technical Summary

Problems solved by technology

[0004] At present, due to factors such as the consistency, safety and cost of power batteries, the healthy and rapid development of the entire industrial chain of new energy power batteries is seriously restricted; and the latest technology from the United States and Japan has been developed to develop a new type of large-capacity, Long cycle life, good high and low temperature performance, high specific energy and specific power, and high safety laminated hybrid polymer colloidal lithium-ion power batteries can greatly solve the above problems, thus creating a great opportunity for the wide application of polymer lithium-ion power batteries. Broad prospects; but in the production process, its single large-capacity power battery, its monomer and group modules caught fire and burned during the destructive acupuncture and extrusion safety tests, which does not meet the requirements of power lithium-ion batteries. Safety test standards, there are certain safety hazards in large-scale use; due to the destructive acupuncture and extrusion of single large batteries and their group modules, there are certain safety hazards, which greatly limits its scope of use

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