At present, the lithium iron phosphate battery is the most widely used battery in electric vehicles. This kind of battery has high safety and long monomer life. However, the lithium iron phosphate battery has a fatal disadvantage. Its low-temperature performance is slightly worse than that of other technical systems.

Low temperature has an effect on the positive and negative electrodes, electrolyte and adhesive of lithium iron phosphate battery. For example, the positive electrode of lithium iron phosphate battery itself has poor electronic conductivity, which is easy to produce polarization in low temperature environment, thus reducing the battery capacity; due to the influence of low temperature, the speed of graphite lithium insertion is reduced, which is easy to precipitate lithium metal on the negative electrode surface. If the storage time is insufficient after charging and put into use, the lithium metal can not be completely embedded in the graphite again, and some lithium metal continues to exist in the negative electrode. The surface is very likely to form lithium dendrites, which will affect the safety of the battery; at low temperature, the viscosity of the electrolyte will increase, and the lithium ion migration impedance will also increase; in addition, in the production process of lithium iron phosphate battery, the adhesive is also a very key factor, and the low temperature will also have a greater impact on the performance of the adhesive.