The circular lithium-ion battery refers to the cylindrical lithium-ion battery. The earliest cylindrical lithium-ion battery was the 18650 lithium-ion battery invented by the Japanese company SONY in 1992. Because the 18650 cylindrical lithium-ion battery has a long history, the market’s The penetration rate is very high. The cylindrical lithium-ion battery adopts a fairly mature winding process, with a high degree of automation, stable product quality and relatively low cost. There are many types of cylindrical lithium-ion batteries, such as 14650, 18500, 18650, 21700, 26650 and so on. Cylindrical lithium-ion batteries are more popular among Japanese and Korean lithium-ion battery companies. There are also quite large companies in my country that produce cylindrical lithium-ion batteries.

    Cylindrical lithium-ion batteries are divided into lithium cobalt oxide, lithium manganate, and ternary materials. Batteries of the three material systems have different advantages. Batteries are widely used in notebook computers, digital cameras, lighting fixtures, toy products, power tools, portable mobile energy and other fields.

    The 10440 battery is a lithium-ion battery with a diameter of 10mm and a height of 44mm. It is the same size as the AA battery we often call it. The battery capacity is generally small, only a few hundred mAh. It is mainly used in mini electronic products. Such as flashlights, mini stereos, amplifiers, etc.

    The 14500 battery is a lithium-ion battery with a diameter of 14mm and a height of 50mm. This is also the size of the battery we have always called the 5th battery. This battery is generally 3.7V or 3.2V, and its nominal capacity is relatively small, which is smaller than that of the 10440 battery. Larger, generally about 1000mAh, with superior discharge performance, the most important application field is consumer electronics, such as wireless audio, electric toys, digital cameras, etc.

    The 18650 battery is a lithium-ion battery with a diameter of 18mm and a height of 65mm. Its biggest feature is that it has a very high energy density, almost reaching 170 Wh/kg, so this battery is a cost-effective battery. We usually Most of the batteries that are often seen are this kind of battery, because it is a relatively mature lithium-ion battery, and the system quality is stable in all aspects. on the appliance.

    The 21700 battery is a lithium-ion battery with a diameter of 21mm and a height of 70mm. Because of its increased volume and space utilization, the energy density of the battery cell and the system can be improved. Its volumetric energy density is much higher than 18650 type battery is widely used in digital, electric vehicles, balance cars, solar energy lithium-ion battery street lights, LED lights, power tools, etc.

    Prevent charging at high temperature If the cylindrical lithium-ion battery is used in an environment higher than the specified operating temperature, that is, above 45°C, the power of the battery will continue to decrease, that is, the battery‘s power supply time will not be as long as usual. If the device is charged at such a temperature, the damage to the battery will be even greater.