How lithium-ion batteries are produced -Lithium - Ion Battery Equipment

How lithium-ion batteries are produced -Lithium - Ion Battery Equipment

1. Lithium batteries are usually divided into two categories according to internal materials:

Lithium metal battery: Lithium metal battery generally uses manganese dioxide as the positive electrode material, metallic lithium or its alloy metal as the negative electrode material, and uses a non-aqueous electrolyte solution.

Lithium-ion batteries: Lithium-ion batteries generally use lithium alloy metal oxides as positive electrode materials, graphite as negative electrode materials, and use non-aqueous electrolytes.

Although lithium metal batteries have a high energy density, they can theoretically reach 3860 watts/kg. However, because its nature is not stable enough and cannot be charged, it cannot be used as a power battery for repeated use. The lithium-ion battery has been developed as the main power battery due to its ability to be repeatedly charged. However, due to the combination of different elements, the composition of the cathode material varies greatly in performance in various aspects, resulting in increased disputes over the cathode material route in the industry.(Lithium - Ion Battery Equipment)

Usually the power batteries we talk about the most are lithium iron phosphate batteries, lithium manganate batteries, lithium cobalt oxide batteries and ternary lithium batteries (ternary nickel cobalt manganese)

2, according to the use points; can also be divided into two categories:

The first is digital batteries, which are our daily mobile phones, tablets, mobile power supplies, etc. These are all digital batteries.

The second is power batteries, which are batteries used in Tesla, BYD, some new energy electric vehicles, and drones. These batteries require a large instantaneous current, and digital batteries cannot meet the instantaneous high current. Class is also called high rate battery, the price is more expensive than digital battery.

3. According to the shell material, it can be divided into three categories:

The first category, steel shell batteries, as the name suggests, is that the shell is made of steel.

The second type, aluminum shell batteries, similarly the shell is made of aluminum.

The third type, polymer batteries, the outer casing is a polymer material, mostly silver, and a few manufacturers make black, and the industry has become black skin.

4, according to the shape is also divided into three categories:

The first type is cylindrical battery, which is used a lot, like 18650, 26650, etc. This is generally used in combination, and the combination with less combination can be used as digital products, like early notebook computers, generally 8 18650, mobile power, There are combinations ranging from one to five or six, and there are more than 7,000 series and parallel combinations of Tesla's 18650.

The second type is the square battery, most of which are polymer batteries, because this polymer has good ductility and can make many shapes, and the length, width and height can be adjusted at will. Now most digital products use this type of battery. .

The third type, special-shaped batteries, are some strange-shaped batteries. According to the needs of the product, the battery should also be in a matching shape. For example, the popular smart wearable products, such as smart bracelets, are annular, so the battery is also made into a annular shape.

The structure of lithium battery

Lithium battery structure is divided into five parts, namely positive electrode, negative electrode, separator, electrolyte and shell.

(1) The positive electrode of lithium battery contains active material, conductive agent, solvent, binder, matrix and other substances.

(2) The negative electrode of lithium battery contains active material, binder, solvent, matrix and other substances.

(3) Lithium battery separator

(4) Lithium battery electrolyte

(5) Lithium battery shell includes steel shell, aluminum shell, cover plate, tabs, insulating tape and other hardware.

Detailed explanation of the production process flow chart of lithium battery

Lithium battery production flow chart

The production process of lithium batteries is not very consistent for each manufacturer, but most of them are inseparable from these links, as shown below:

Detailed explanation of the production process flow chart of lithium battery

Specifically as follows: material preparation - homogenization - coating - rolling - slitting - baking - winding - into the shell - laser welding - baking - liquid injection - pre- Filling - sealing - cleaning - aging - full inspection - storage - shipping.



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