What is a cylindrical lithium battery?
1. Definition of cylindrical lithium battery
Cylindrical lithium battery is a kind of lithium ion battery. Its shape is cylindrical, so it is called cylindrical lithium battery. Cylindrical lithium battery is divided into lithium cobalt oxide (LiCoO2), lithium manganate (LiMn2O4), Lithium nickel cobalt manganate (LiNiMnCoO2 or NMC), lithium nickel cobalt aluminate (LiNiCoAlO2 or NCA), lithium iron phosphate (LiFePO4) and lithium titanate (Li4Ti5O12).
There are many types of cylindrical lithium batteries, the common ones are 14500, 14650, 18500, 18650, 21700, 26650, 32650, etc. They are widely used in special equipment, medical equipment, instrumentation, handheld equipment, security communications and other fields.
2. Cylindrical lithium battery structure
The structure of a typical cylindrical battery includes: shell, cap, positive electrode, negative electrode, separator, electrolyte, PTC element, gasket, safety valve, etc. Generally, the battery shell is the negative electrode of the battery, the cap is the positive electrode of the battery, and the battery shell is made of nickel-plated steel plate. 18650 Lithium Ion Battery Shrink Wrap
3. Advantages of cylindrical lithium batteries
Compared with soft-pack lithium batteries and square lithium batteries, cylindrical lithium batteries have the longest development time, higher standardization, more mature technology, high yield and low cost.
The production process is mature, the PACK cost is low, the battery product yield is high, and the heat dissipation performance is good.
Cylindrical batteries have formed a series of internationally unified standard specifications and models, with mature technology and suitable for large-scale continuous production.
The specific surface area of the cylinder is large, and the heat dissipation effect is good.
Cylindrical batteries are generally sealed batteries, and there is no maintenance problem during use.
The battery shell has high pressure resistance, and there will be no swelling of the square and soft-packed batteries during use.
