Lithium batteries usually have two shapes: cylindrical and square. The inner part of the battery adopts a spiral wound structure, which is made of a very fine and highly permeable polyethylene film isolation material spaced between the positive and negative electrodes. The positive electrode consists of lithium cobalate (or lithium nickel cobalt manganate, lithium manganate, lithium ferrous phosphate, etc.)

　　And aluminum foil. The cathode consists of a current collector made of graphitized carbon material and copper foil. The battery is filled with organic electrolyte solution. In addition, safety valves and PTC elements (partially cylindrical) are also installed to protect the battery from damage in case of abnormal state and output short circuit.

　　The voltage of a single lithium battery is 3.7V (3.2V for lithium ferrous phosphate cathode), and the battery capacity cannot be unlimited. Therefore, single lithium batteries are often treated in series and parallel to meet the requirements of different occasions.

Read recommendations:

6F22

Advantages and disadvantages of lithium iron phosphate battery

How to Control the Cost of Lithium - ion Batteries

convenient energy storage power supply sales

3.7 volt 18650 lithium battery