What is the difference between lithium batteries and batteries?
Cell refers to a single electrochemical cell containing positive and negative electrodes, which is generally not used directly. Different from the battery contains protection circuit and shell, can be used directly. Cells are divided into three types: aluminum shell cells, soft-coated cells (also known as "polymer cells"), and cylindrical cells. Usually mobile phone batteries use aluminum shell cells, digital products such as Bluetooth use soft-packed cells, and laptop batteries use a series-parallel combination of cylindrical cells.
Lithium battery is mainly composed of two parts, battery cell and protection board PCM (power battery is generally called battery management system BMS), protection board is mainly composed of protection chip (or management chip), MOS tube, resistor, capacitor and PCB board, etc. The battery cell is equivalent to the heart of the lithium battery, and the management system is equivalent to the brain of the lithium battery. The battery cell is mainly composed of positive electrode material, negative electrode material, electrolyte, diaphragm and shell.
The battery cell is an important part of the lithium battery assembly. It is often said that the lithium battery is composed of the battery cell, the management (protection) unit, and the outer casing, so it is normal for the size to be different. The battery cell is a semi-finished product and cannot be used directly as a battery. It is only used to provide power. It needs to be equipped with a protection circuit and a casing package to form a finished battery.
