Battery, battery car, means a space in a cup, tank or other container or composite container containing an electrolyte solution and a metal electrode to generate electrical current, a device capable of converting chemical energy into electrical energy. It has a positive electrode and a negative electrode. As technology advances, batteries are broadly referred to as small devices that generate electrical energy. Such as lead-acid batteries, lithium batteries. The performance parameters of the safe power battery mainly include electromotive force, capacity, specific energy and resistance. By using the battery as an energy source, it is possible to obtain a current with stable voltage, stable current, stable power supply for a long time, and little influence from the outside, and the battery has a simple structure, convenient carrying, convenient charging and discharging operation, stable and reliable performance. Power generation plays an important role in new energy.