How is 18650 lithium battery defined?
As a newcomer in the lithium battery industry, it is essential to understand the types of lithium batteries, as you will constantly encounter customers asking you questions about what materials, forms, and where they are used in your future sales. Do you need to know how to distinguish the types of lithium batteries?
The first type is classified by shape name:
When we often hear trade phone calls from peers with numbers like 1865026650, the first thing we say is that lithium-ion batteries are named after their shape.
① Cylindrical, commonly known shapes include 186502665021700, etc. Their names are based on the size of the shape. Taking 18650 as an example, 18 represents a diameter of 18mm, 65 represents a height of 65mm, and 0 represents a cylindrical shape.
This type of battery cell can be flexibly assembled into different shapes, with low space requirements. However, the capacity of a single battery cell is small, assembly is relatively complex, welding labor is large, and maintenance is difficult. It is mainly used for battery packs that require smaller volume or irregular appearance.
② Rectangular packaging, commonly referred to as a single unit in the industry, is an aluminum shell battery cell. The outer shell is usually a relatively hard aluminum shell or plastic, and the volume of a single battery cell varies depending on its capacity. The battery volume is limited by the battery cells.
③ Soft pack battery cells, also known as bagged battery cells or polymer battery cells, are wrapped in aluminum-plastic film. Soft pack battery cells have a relatively small volume but poor resistance to expansion energy.
Lithium Ion Battery
Second type: Classified by positive electrode material
There are three common types of lithium batteries, namely ternary lithium, lithium manganese oxide, and lithium iron phosphate
Compare these three commonly used lithium batteries in terms of energy density, low-temperature characteristics, stability, cycle times, and process difficulty, as shown in the table:
Third type: Classified by purpose
This is easier to understand. One is the energy storage type, which has a low discharge rate and relatively low cost. It is commonly used in devices such as power banks, mobile phones, flashlights, etc. that discharge smoothly. The other type is the power type, which can achieve high instantaneous discharge, fast charging and discharging time, high cost, and is commonly used in electric vehicles, electric bicycles, power tools, model drones, etc.
The fourth type is classified into high-temperature lithium batteries and low-temperature lithium batteries according to the temperature of the usage environment.
