Lithium batteries are a type of rechargeable battery that uses graphite or other carbon materials as the negative electrode and compounds containing lithium as the positive electrode. It is a type of battery made of lithium metal or lithium alloy as positive/negative electrode materials, using non-aqueous electrolyte solutions.

1、 The development of lithium batteries

In 1981, the first patent for lithium-ion batteries was published.

In 1992, SONY Company has started large-scale production of lithium-ion batteries for civilian use.

In 1998, a large number of square lithium-ion batteries were launched in the market, occupying a large market share.

In 1999, China began mass production of lithium-ion batteries.

2、 Classification of lithium batteries

1. Classification by appearance

Cylindrical lithium battery

The model name of cylindrical lithium-ion batteries is generally 5 digits. The first two digits are the diameter of the battery, the middle two digits are the height of the battery, and the last digit 0 represents the cylindrical shape, measured in millimeters.

The most commonly used cylindrical lithium batteries:

18650 lithium battery

14500 lithium battery

18500 lithium battery

21700 lithium battery

26650 lithium battery

32650 (32700) lithium battery

Square lithium battery

Square lithium batteries usually refer to aluminum or steel shell square lithium batteries, widely used in exploration and mapping, medical equipment, and portable testing equipment.

2. Classification by shell

Steel shell lithium battery

Early lithium-ion batteries were mostly made of steel shells. Due to the heavy weight of the steel shell, its safety is poor, but the stability of the steel is strong. In the later stage, many manufacturers use safety valves The optimized design structure of PTC and other devices greatly enhances their safety performance. And some directly replace the steel shell and use aluminum shell and soft package, such as the current mobile phone battery.

Aluminum shell lithium battery

Aluminum shell lithium-ion batteries are lighter in weight and slightly safer than steel shell lithium-ion batteries.

Flexible packaging lithium batteries

Flexible packaging lithium-ion batteries are gradually expanding their market share due to their advantages of light weight, low mold cost, and high safety.