Cylindrical Lithium Battery
In this post, we will learn about the cylindrical lithium battery including its classification, characteristics, structure, specifications and advantages.
Classification of cylindrical lithium battery
Based on the filler material, cylindrical lithium battery can be divided into:
lithium iron phosphate battery, lithium cobalt oxide battery, lithium manganese oxide battery and ternary lithium battery.
While according to the type of shell, it can be divided into:
Steel shell lithium battery and polymer shell lithium battery.
Below are our DLN lithium-ion batteries. As we can see, their shells are the steel ones. And they belong to the type of ternary lithium battery.
1. Characteristics of cylindrical lithium batteries
1.1 Shape
Cylindrical lithium batteries are generally composed of positive electrode materials (nickel cobaltate or zinc manganate), separator paper and electrolyte. The shell is made of aluminum-plastic composite pipe.
1.2 Capacity
The rated energy density of a single-cell cylindrical lithium battery is between 300 and 500Wh/kg, and its specific power can reach more than 100W.
According to different models and specifications of products, the actual performance of such products may vary.
1.3 Safety and reliability
It has high safety and stability, overcharge resistance, high temperature resistance, long service life, etc.
1.4 Application
Power supply for mobile phones, digital cameras, MP3, notebook computers, car starters, electric tools, and other portable electronic products.
2. Structure of cylindrical lithium battery
2.1 Ordinary cylindrical lithium-ion batteries
They are composed of a casing, a cap, a positive electrode, a negative electrode, a separator, and an electrolyte.
Generally, the battery shell is the negative pole of the battery, the cap is the positive pole of the battery, and the battery shell is made of nickel-plated steel plate.
2.2 Power cylindrical battery
The important difference of the power cylindrical battery is the conductive connection structure of the battery. Because the general application current of power lithium batteries is relatively large, a special high-current structure design is required.
3. Specifications of cylindrical lithium batteries
The model of a cylindrical lithium battery is usually indicated by five digits. Starting from the number on the left, the first and second numbers refer to the diameter of the battery. The third number refers to the height of the battery. And the fifth number refers to the diameter of the battery. is round.
There are many types of cylindrical lithium batteries. Among them, the more common ones are:
① 10440 battery
The 10440 battery is a lithium battery with a diameter of 10 mm and a height of 44 mm. The same size as what we usually call the 7th battery.
The capacity of this battery is generally very small, only a few hundred mah. And it is mainly used for mini electronic products, such as flashlight, mini audio, speaker, etc.
② 14500 battery
The 14500 battery is a lithium battery with a diameter of 14 mm and a height of 50 mm.
This kind of battery is generally 3.7V or 3.2V. And the nominal capacity is relatively small, a little larger than the 10440 battery, generally 1600mah, with excellent discharge performance.
It is mainly used in consumer electronics, such as wireless audio, electric toys, digital cameras, etc.
③ 16340 battery
The 16340 battery is a lithium battery with a diameter of 16 mm and a height of 34 mm.
This type of battery is often found in glare flashlights, LED flashlights, headlights, laser lights, lights, etc. , because the ruler height is relatively short, and the capacity is not very small.
④ 18650 battery
The 18650 battery is a lithium battery with a diameter of 18 mm and a height of 65 mm. Its biggest feature is its very high energy density, almost reaching 170 Wh/kg.
Therefore, this battery is a very cost-effective battery. This kind of battery are common in our life, because it is a relatively mature lithium battery with good system quality stability in all aspects.
It is widely used in occasions with a battery capacity of about 10 kWh, such as mobile phones, notebook computers and other small electrical appliances.
Belows are our 18650 lithium-ion batteries.
⑤ 21700 battery
The 21700 battery is a lithium battery with a diameter of 21 mm and a height of 70 mm.
Due to its increased volume and increased space utilization, it can increase the energy density of battery cells and systems. Its volumetric energy density is much higher than that of 18650 batteries.
It is widely used in digital, electric vehicles, balance cars, solar lithium battery street lights, LED Lights, power tools, etc.
⑥ 26650 battery
The 26650 battery is a lithium battery with a diameter of 26mm and a height of 65mm, with a nominal voltage of 3.2V.
The nominal capacity is 3200mah. This kind of battery has excellent capacity and high consistency.
⑦ 32650 battery
The 32650 battery is a lithium-ion battery with a diameter of 32 mm and a height of 65 mm.
This battery has a strong continuous discharge capacity, so it is more suitable for electric toys, backup power, ups batteries, and wind power generation systems.
4. Advantages of cylindrical lithium batteries
4.1 The production process is mature, the cost of PACK is low, the yield rate of battery products is high, and the heat dissipation performance is good.
4.2 Cylindrical batteries have formed a series of internationally unified standard specifications and models, with mature technology and suitable for mass continuous production.
4.3 The specific surface area of the cylinder is large, and the heat dissipation effect is good.
4.4 Cylindrical batteries are generally sealed batteries, and there is no maintenance problem during use.
4.5 The battery casing has high pressure resistance, and there will be no phenomenon such as the expansion of square soft-packed batteries during use.
The above is the summary of all aspects of cylindrical lithium batteries.
Cylindrical lithium batteries are more suitable for mass automated combined production.
Large quantities of lithium-ion batteries for electric bicycles and electric motorcycles are basically in the category of cylindrical lithium-ion battery production.
Not only that, the cylindrical lithium battery is also recognized as a green and healthy battery, which is very environmentally friendly and can be used with confidence.