Lithium iron phosphate batteries currently on the market generally consist of the following: positive electrode material (lithium iron phosphate), negative electrode material (graphite), aluminum foil (positive), and copper foil (negative) as positive and negative current collectors. , the tabs of the positive and negative poles (i.e. derived from the current collector). Added to this are separators, electrolytes, aluminum-plastic films and battery protection panels. It adopts the winding type and is made into a 18650 type battery.
The principle is that when discharging, Li ions migrate from the negative electrode to the positive electrode; and when charging, Li ions migrate from the positive electrode to the negative electrode, which is a rocking chair battery.