▎ 摘　　要

NOVELTY - Preparation of square aluminum shell low-temperature rate lithium-ion battery involves mixing anode active material, conductive carbon black, carbon nanotube conductive slurry, polyvinylidene fluoride and dispersant to obtain precursor (A), adding N-methylpyrrolidone to obtain anode slurry, coating anode slurry on aluminum foil, rolling, slitting to form anode, mixing cathode active material, conductive carbon black, sodium carboxymethyl cellulose, and styrene butadiene rubber to obtain precursor (B), adding water to obtain cathode slurry, coating cathode slurry on copper foil, rolling and slitting to form cathode, separating the anode and cathode with lithium-ion battery separator, welding them into square aluminum shell to form square electrode assembly, injecting electrolyte into electrode assembly, pre-forming the electrolyte into exhaust gas, sealing and cleaning, aging to obtain square aluminum shell lithium-ion battery, placing in environment of 45-50degrees Celsius, and cooling. USE - Preparation of square aluminum shell low-temperature rate lithium-ion battery (claimed) e.g. lithium iron phosphate battery. ADVANTAGE - The preparation method is simple, reliable and stable, and enables to prepare square aluminum shell lithium-ion battery with excellent low-temperature rate performance and long service life through the cathode and anode material selection optimization, and using the coating ceramic separator and amorphous electrolyte, and is suitable for large-scale production. DETAILED DESCRIPTION - Preparation of square aluminum shell low-temperature rate lithium-ion battery involves mixing anode active material, conductive carbon black, carbon nanotube conductive slurry, polyvinylidene fluoride as binder and dispersant to obtain precursor (A), adding N-methylpyrrolidone to adjust the viscosity to obtain anode slurry, coating the anode slurry on the aluminum foil, rolling, and slitting to form anode with side foil, mixing cathode active material, conductive carbon black, sodium carboxymethyl cellulose, and styrene butadiene rubber as thickener to obtain precursor (B), adding water to adjust the viscosity to obtain cathode slurry, coating cathode slurry on the copper foil, rolling and slitting to form cathode with side foil, separating the anode and cathode with lithium-ion battery separator, welding them into square aluminum shell through winding and ultrasonic welding to form square electrode assembly with all lugs, injecting lithium-ion battery electrolyte into electrode assembly, pre-forming the electrolyte into exhaust gas, sealing and cleaning, aging at high temperature to obtain square aluminum shell lithium-ion battery, fully discharging the formed battery at room temperature and placing in environment of 45-50degrees Celsius for 2-4 hours, cooling to 0-5degrees Celsius and discharging at room temperature.