Cylindrical Lithium Ion Battery

Samsung INR18650-25R 2500mAh Lithium-ion Rechargeable Cell

18500 Lithium Ion Battery

Nominal voltage: 3.6V

Nominal capacity: 800-1500mAh

Diameter: 18±0.2mm

Height: 50±0.3mm

Application: security communication, rail transit

14500 Lithium Ion Battery

Nominal voltage: 3.7V

Nominal capacity: 800mAh

Diameter: 14mm

Height: 50mm

Application: instrumentation, consumer electronics

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.
Cylindrical Lithium Ion Battery Cell, Module and Battery Pack
In a lithium ion battery pack, for the sake of safety and effective management of hundreds of single battery cells, the cells are not randomly placed in the case of the lithium ion battery, but are arranged in an orderly manner according to modules and packages. The smallest unit is battery cell, many of which can make a module, and several modules can make a battery pack.
1.Cylindrical Lithium Ion Battery Cell
Battery cell is the smallest unit of the lithium ion battery pack, and it is also the energy storage unit. It must have a high energy density to store as much power as possible, so that the device can work for a long time. In addition, the life of the lithium ion battery cell is also the most critical factor. The damage of any one battery cell will affect the entire battery pack.
2.Lithium Ion Battery Module
Constitute multiple battery cells enclosed by the same battery case make a module. It connects to the outside by a uniform interface.
3.Lithium Ion Battery Pack
When several modules are jointly controlled or managed by BMS and thermal management system, it is called lithium battery pack.