Explore Cylindrical Lithium Battery

Cylindrical lithium batteries are divided into lithium iron phosphate(lifepo4), lithium cobalt oxide, lithium manganese oxide, cobalt manganese mixture, ternary material different systems, the shell is divided into steel shell and polymer two, different material system batteries have different advantages.

what is a cylindrical lithium battery?

Cylindrical lithium batteries are divided into lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, and cobalt manganese mixture, ternary material different systems, the shell is divided into steel shell and polymer two, different material system batteries have different advantages. At present, the cylinder is mainly based on the steel shell cylindrical lithium iron phosphate battery, which is characterized by high capacity, high output voltage, good charge-discharge cycle performance, stable output voltage, large current discharge, stable electrochemical performance, safe use, wide operating temperature range, and friendly to the environment. Widely used in solar lamps, lawn lamps, backup energy, power tools, and toy models.

Cylindrical lithium battery structure

The structure of a typical cylindrical battery includes housing, cap, positive, negative, diaphragm, 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.

The advantages of cylindrical lithium battery

Compared with soft pack lithium batteries and square lithium batteries, cylindrical lithium batteries have the longest development time, higher standardization, more mature process, high yield, and low cost.

1. Mature production process, low PACK cost, high yield of battery products, good heat dissipation performance

2. The cylindrical battery has formed a series of international unified standard specifications and models, mature process, suitable for mass continuous production.

3. The specific surface area of the cylinder is large, the heat dissipation effect is good.

4. Cylindrical batteries are generally sealed batteries, and there are no maintenance problems during use.

5. The battery shell withstand high pressure, the use of the process will not appear such as square, flexible packaging battery expansion and other phenomena.

The models of cylindrical lithium battery

With the development of lithium battery technology, there are more and more types of cylindrical lithium batteries, cylindrical lithium ion batteries are divided into lithium cobalt acid, lithium manganese acid, ternary materials, and the three material system batteries have different advantages. Let's take a look at the models and specifications of cylindrical lithium batteries.

Cylindrical lithium-ion cells are usually represented by five digits, counting from the left, the first and second digits refer to the diameter of the battery, the third and fourth digits refer to the height of the battery, and the fifth digit represents the circle. There are many models of cylindrical lithium batteries, the more common are 10400, 14500, 16340, 18650, 21700, 26650, 32650, 33140, 40146, and so on.

1. 10440 battery

The 10440 battery is a lithium-ion battery with a diameter of 10mm and a height of 44mm, which is the same size as the No. 7 battery, and the battery capacity is generally small, only a few hundred mAh, which is important for mini electronic products. Such as flashlights, mini speakers, loudspeakers, etc.

2. 14500 battery

The 14500 battery is a lithium-ion battery with a diameter of 14mm and a height of 50mm, which is also the size of the No. 5 battery we have always called, this battery is generally 3.7V or 3.2V, and the nominal capacity is relatively small, larger than the 10440 battery, generally 1600mAh, excellent discharge performance, The most important application areas are consumer electronics, such as wireless audio, electric toys, digital cameras and so on.

3. 16340 battery

16340 battery is a diameter of 16mm, a height of 34mm lithium-ion battery, The battery the height is a little lower, and the capacity is not very small, so in the strong flashlight, LED flashlight, headlamp, laser light, lighting fixtures and so on often appear.

4. 18650 battery

18650 battery is a diameter of 18mm, a height of 65mm lithium-ion battery, its biggest feature is that it has a very high energy density, almost 170 watt-hours/kg, so this battery is a better cost-effective battery, we usually often see most of this battery, because it is a more mature lithium-ion battery, All aspects of the system quality stability is good, widely used in 10 KWH or so battery capacity occasions, such as in, in mobile phones, laptops and other small electrical appliances.

5. 21700 battery

The 21700 battery is a lithium-ion battery with a diameter of 21mm and a height of 70mm, because its volume increases, the space utilization rate increases, the energy density of the battery cell and the system can be improved, and its volume energy density is much higher than that of the 18650 battery, which is widely used in digital. Electric vehicles, balance vehicles, solar energy lithium-ion battery street lights, LED lights, power tools, etc. Production of this battery manufacturer important Tesla, Samsung, Panasonic, Bic, Lion New Energy and so on.

6. 26650 battery

26650 battery has a diameter of 26mm, a height of 65mm lithium-ion battery, a nominal voltage of 3.2V, nominal capacity of 3200mAh, this battery with excellent capacity and high consistency, and other characteristics, has gradually become the replacement of the 18650 battery trend, in the power lithium battery many products will gradually favor this.

7. 33140 battery

33140 battery has a diameter of 33mm, a height of 140mm lithium ion battery. This battery is suitable for a variety of application scenarios, including electric vehicle batteries, and solar and street lamp batteries also has a high energy density and light weight, long cycle life, low internal resistance, universal multi-purpose, as well as energy saving and environmental protection characteristics. It solves the safety hazards of lithium cobaltate and lithium manganate, ‌ making it a safe and durable energy solution.

8. 40146 battery

40146 battery has a diameter of 40mm, a height of 160mm lithium-ion battery, This kind of battery usually has a high energy density and charge/discharge ratio, so it is widely used in electric vehicles and other fields. The battery test system adopts the Nimbert battery test system, which has high test accuracy and reliability. In addition, this type of battery has a wide operating temperature range, from -20℃ to +60℃, to meet the needs of various environmental conditions.