In recent years, with the global concerns on energy conservation, lithium-ion batteries have gradually been used in telecommunications, national grid and electric cars and other industries. Energy saving power for the communications industry, the requirements of the battery smaller, lighter, longer, more heat, maintenance is easier, more stable, more environmental protection, so in order to comply with these requirements, lithium-ion batteries is gradually changing the direction of the high-capacity battery, lithium iron phosphate (LiFePO4) battery used in communication industry came into being.