Basic structure of 18650 battery.

Basic structure of 18650 lithium battery pack.
The basic structure of a lithium battery consists of four parts: the battery cell, the protective plate, the outer shell, and the leads/terminals.

1. Battery cells
The battery cell is the most important component of a battery and the carrier of energy conversion.
Mainly divided into cylindrical lithium-ion cells, square lithium-ion cells, and soft pack polymer cells

2. Protective board
A protective board is an electronic functional module that protects the normal operation of battery cells and prevents abnormal accidents from occurring.

Divided into two types based on quantity: single section boards and multi section boards.
Divided by product category, it is divided into three types: ordinary board, intelligent board, and power board.

The main parameters include overcharge, overdischarge, overcurrent, self consumption, internal resistance, protection leakage current, and other parameters.

3. Lead wires and terminal wires
Including various specifications and brands of wires from # 32 to # 10.
Including various types of terminal heads.

4. Shell
The casing is a shell that fixes the battery cell and protective board together, seals them, and completes the matching function with the host.
Common materials for the shell include ABS, ABS+PC, PC, etc.

The main indicators for measuring the shell include color, material, fit, mechanical strength, etc.