What is a Cylindrical Lithium Battery?

1.Definition of Cylindrical Lithium Ion Battery

Cylindrical lithium-ion battery is a lithium ion battery with cylindrical shape, so called cylindrical lithium-ion battery. According to the anode materials, cylindrical li-ion battery are divided into lithium cobalt oxides (LiCoO2), lithium manganese (LiMn2O4), lithium nickel manganese cobalt (LiNiMnCoO2 or NMC), lithium aluminum nickel cobalt (LiNiCoAlO2 or NCA), lithium iron phosphate (LiFePO4) and lithium titanate (Li4Ti5O12). 

There are many types of cylindrical lithium batteries, including 14500, 14650, 18500, 18650, 21700, 26650, 32650, etc. They are widely used in special equipment, medical equipment, instrumentation, handheld equipment, security and communication.

2. Structure of Cylindrical Lithium Ion Battery

A typical cylindrical battery structure includes: case, cap, positive electrode, negative electrode, separator, electrolyte, PTC element, gasket, anti explosive valve, etc. Generally, the battery case is the negative electrode of the battery, and the cap is the positive electrode of the battery. The battery case is made of nickel steel plate.

3. Advantages of Cylindrical Lithium Ion Battery

Compared with lithium pouch cell and prismatic lithium battery, cylindrical lithium battery has the longest development time, high degree of standardization, mature technology, high yield and low cost.

• Mature production process, low pack cost, high battery yield, good heat dissipation performance
• Cylindrical battery has international standard of specifications and models, mature technology, which is suitable for mass continuous production.
• Large specific surface area of the cylindrical lithium ion battery and nice heat dissipation effect
• Cylindrical battery is generally sealed battery. There is no maintenance problem in the use process.
• Cylindrical battery case has high pressure resistance, so the battery will not expand in the use process like prismatic battery and pouch cell.