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, common ones are 14500, 14650, 18500, 18650, 21700, 26650, 32650, etc., which are widely used in special equipment, medical equipment, instrumentation, handheld devices, 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 case is the negative electrode of the battery, the cap is the positive electrode of the battery, and the battery case is made of nickel-plated steel plate.
3. The advantages of cylindrical lithium batteries
Compared with soft-pack lithium batteries and square lithium batteries, cylindrical lithium batteries have the longest development time, with a higher degree of standardization, a more mature process, a high yield rate and a low cost.
The production process is mature, the PACK cost is low, the battery product yield rate 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 continuous mass 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 are no maintenance problems during use.
The battery shell has high pressure resistance, and there will be no phenomena such as square, flexible packaging battery swelling during use.
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