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What are the types of lithium-ion batteries and batteries?

First, according to the internal materials, lithium-ion batteries are usually divided into two categories

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

Lithium-ion batteries: Lithium-ion batteries generally use lithium alloy metal oxide as the positive electrode material, graphite as the negative electrode material, and non-aqueous electrolyte.

Although the energy density of lithium metal batteries is high, theoretically it can reach 3860 watts/kg. However, due to its insufficient stability and inability to charge, it cannot be used as a power lithium battery for repeated use. The lithium-ion battery has been developed as an important power lithium battery due to its ability to repeatedly charge. However, because of its combination of different elements, the composition of the positive electrode material has great differences in various aspects, which has led to increased disputes over the route of the positive electrode material in the industry.

Second, according to purpose

The first is the digital lithium-ion battery, which is our daily use of mobile phones, tablets, mobile power, etc., these are all digital batteries.

The second is the power lithium-ion battery, which is used by Tesla, BYD, some new energy electric vehicles, and drones. These batteries require a large instantaneous current, and digital batteries cannot meet the instantaneous large current. Therefore, this type of battery is also called high-rate battery, which is more expensive than digital batteries.

Three, divided by shell material

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

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

The third category, polymer lithium ion batteries, the outer shell is a polymer material, mostly silver, a few manufacturers make black, the industry has become black.

Fourth, divide by shape

The first type is cylindrical batteries, which are used a lot, such as 18650, 26650, etc., which are generally used in combination, and those with fewer combinations 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 7000 series and parallel combinations of Tesla's 18650.

The second type is square batteries. Most of these batteries are polymer batteries. Because this polymer is very malleable and can be made into many shapes, the length, width and height can be adjusted at will. Now most digital products use this type of battery .

The third type, abnormal-shaped batteries, are some weird-shaped batteries. According to the needs of the product, the batteries must also have matching shapes. For example, the popular smart wearable products, such as smart bracelets, are ring-shaped, so the battery is also made into a ring.

What are the types of lithium-ion battery cells?

There are currently three types of mobile power batteries on the market: 18650 batteries, polymer batteries, and lithium iron phosphate batteries.

18650 batteries

The 18650 lithium battery cell refers to a battery with a diameter of 18mm and a length of 65mm, and 0 represents a cylindrical battery. The 18650 battery cell technology is relatively mature, the battery structure is stable, the specific capacity is high, the comprehensive performance is outstanding, and because of its small size, it can be used in many areas. The disadvantage is that its safety is worse than that of polymer lithium-ion batteries, and the number of cycles of the battery core is lower, only about 300 times.

Polymer batteries

The difference between polymer batteries and traditional lithium-ion batteries lies in the production process. Lithium-ion batteries are wound and are relatively soft. The polymers are superimposed and have a harder body. With the same volume of polymer and lithium ion batteries, the capacity of the polymer is greater, about 30% higher. And it is safer and has a low risk of explosion. long lasting. The charge and discharge reached more than 500 times. The disadvantage is that the cost is high. Polymer batteries with the same capacity are at least 100% more expensive than 18650 lithium ion batteries.

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