Low-temperature charge and heating system and method for power battery for all-electric vehicles

technical field [0001] The invention belongs to the technical field of pure electric vehicles, and in particular relates to a low-temperature charging and heating system and heating method for power batteries of pure electric vehicles. Background technique [0002] Pure electric vehicles have many advantages such as energy saving and environmental protection, and are the product of the combination of many high and new technologies. With the reduction of energy sources and the vigorous advocacy of the government, they will surely have a broad market in the near future. [0003] Pure electric vehicles can make reasonable use of the advantages of power grid valley power. At present, my country has listed the industrialization of pure electric vehicles as a new energy vehicle industry plan. The key bottleneck affecting the industrialization of pure electric vehicles is the power battery. At present, most of the power batteries of pure electric vehicles use lithium-ion power batt...