1、 Classification based on the shape of the packaging shell

1. Aluminum shell

Lithium ion batteries in the shape of aluminum shells have a lighter weight and slightly better AQ stability than lithium batteries made of steel shells

2. Steel shell

This refers to early lithium-ion batteries, mostly made of steel shells, which had poor AQ stability, but are now rarely used.

3. Flexible packaging

The flexible packaging method is adopted by many lithium battery products, which involves covering the battery itself with a layer of polymer shell (such as aluminum plastic film packaging). The advantage is weight, low cost, and good stability and AQ performance.

2、 Distinguish by appearance

1. Square (rectangular) lithium battery

Square (rectangular) lithium batteries refer to those that are now made of aluminum shells (early steel shells) and are widely used in consumer electronics, medical industries, and more.

2. Cylindrical shape

The cylinder refers to the lithium-ion batteries, such as 18650, which are usually named with five Arabic numerals, where the first two digits are the diameter of the battery, the middle two digits are the height of the battery, and the last digit of Z, 0, represents a cylinder, with the unit of mm.

For example: 14500 lithium battery, 18650 lithium battery