Lithium Battery Structure

Lithium batteries generally have two types of appearance: cylindrical and square. The interior of the battery adopts a spiral wound structure, which is formed by using a very fine and highly permeable polyethylene film isolation material spaced between the positive and negative electrodes. The positive electrode comprises a current collector composed of lithium cobalt oxide (or nickel cobalt lithium manganese oxide, lithium manganese oxide, lithium ferrous phosphate, etc.) and aluminum foil. The negative electrode consists of a current collector composed of graphitized carbon material and copper foil. The battery is filled with an organic electrolyte solution. In addition, there are safety valves and PTC elements (some cylindrical use) installed to protect the battery from damage during abnormal conditions and output short circuits.
The voltage of a single lithium battery is 3.7V (3.2V for a lithium ferrous phosphate positive electrode), and the battery capacity cannot be unlimited. Therefore, single lithium batteries are often processed in series or parallel to meet the requirements of different occasions.