Battery heating system suitable for rapid cold start in extremely cold environment

The invention provides a battery heating system suitable for rapid cold start in an extremely cold environment, and the battery heating system is effectively suitable for vehicle-mounted power supplies, mobile power supplies and fixed power supply scenes through a flexible and variable structure, and is especially suitable for being used as the vehicle-mounted power supplies. A coil winding and a driving element of a starting generator on a vehicle are creatively used as components of the system, and additional components are not needed, so that the size and the cost of the system are greatly reduced. When cold starting is executed in different use scenes, the system can execute subsequent charging and other operations on the basis of ensuring that the temperature of the battery reaches a proper temperature firstly, the problem of quick starting of the vehicle under special conditions such as an extremely cold environment and field operation is effectively solved, and battery damage in a low-temperature and l