battery (Battery) refers to a part of the space of a cup, tank or other container or composite container that contains an electrolyte solution and metal electrodes to generate electric current, and can convert chemical energy into electrical energy. It has a positive electrode and a negative electrode. With the advancement of technology, batteries generally refer to small devices that can generate electricity. Such as solar cells. The main performance parameters of the battery are electromotive force, capacity, specific energy and resistance. Using the battery as an energy source, you can get a stable voltage, stable current, stable power supply for a long time, the current is very small affected by the outside world, and the battery structure is simple, easy to carry, charge and discharge operation is simple, not affected by the outside climate and temperature, stable and reliable performance, in all aspects of modern social life play a great role.