Lithium-ion battery has high working voltage (three times that of nickel-hydrogen and nickel-cadmium batteries), large specific energy (up to 165Wh/kg, which is 3 times that of nickel-hydrogen battery), small size, light weight, long cycle life and self- Low discharge, no memory effect, no pollution and many other advantages In the new energy industry, lithium iron phosphate batteries are optimistic, the battery cycle life can reach 3,000 or so, the discharge is stable, and is widely used in the fields of power batteries and energy storage.