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Cylindrical lithium batteries are a common type of battery with a variety of specifications to meet the needs of different devices and scenarios. Common cylindrical lithium battery specifications include 18650, 21700, 26650, and so on. The numbers of these specifications represent the size of the battery, with the first two digits representing the diameter of the battery and the middle two digits representing the height of the battery in millimeters. For example, the 18650 lithium battery has a diameter of 18 millimeters and a height of 65 millimeters. Cylindrical lithium batteries of different sizes also differ in terms of capacity, energy density and service life. Generally speaking, batteries with larger diameters and heights have higher capacities and energy densities, and are suitable for devices that require prolonged operation or high power output. Batteries with smaller diameters and heights are more lightweight and suitable for applications where space is limited. Cylindrical lithium batteries are widely used in power tools, electric vehicles, and energy storage systems. They have the advantages of high energy density, long life, low self-discharge rate, etc. They are one of the important energy sources indispensable to modern life.
Cylindrical Li-ion batteries are a common form of lithium batteries, which are widely used in power tools, laptops, electric vehicles, and various types of portable electronic devices due to their compact structure, high energy density, and long cycle life. and all kinds of portable electronic equipment. There are various specifications of cylindrical lithium batteries in the market, and different specifications are based on the diameter, height and capacity of the battery to distinguish. Below we will introduce several common specifications of lithium cylindrical batteries in detail, and provide an overview of their characteristics and application areas.
The specifications of lithium cylindrical batteries are generally expressed in 5-digit numerical representation, with the first two digits representing the diameter of the battery in millimeters (mm), the middle two digits representing the height of the battery in millimeters (mm), and the last digit usually being 0, indicating that the battery is a cylindrical battery. is usually 0, indicating that the battery is cylindrical in shape. For example, an 18650 lithium battery, indicates that the battery has a diameter of 18 mm, a height of 65 mm, and a cylindrical shape.
The following are some common specifications of cylindrical lithium batteries on the market:
14500: 14mm in diameter and 50mm in height, commonly used in small flashlights, e-cigarettes and other devices.
16340: 16mm in diameter and 34mm in height, also known as CR123A, commonly used in video cameras and personal care products.
18650: with a diameter of 18mm and a height of 65mm, it is the most common specification of cylindrical lithium batteries in the market, and is widely used in laptop battery packs, power tools, and electric vehicles.
21700: with a diameter of 21mm and a height of 70mm, this is a newer specification with higher capacity and energy density, and is used by electric vehicle manufacturers such as Tesla.
26650: with a diameter of 26mm and a height of 65mm, it is commonly used in high-performance flashlights and some specialized energy storage systems due to its larger size capable of providing higher capacity.
The capacity of cylindrical lithium batteries is generally determined by the size of the battery, its chemistry, and its design technology. Larger batteries tend to have higher capacity, but this is not absolute; differences in battery materials and manufacturing processes can also have a significant impact on their performance. Here are some approximate capacity ranges for common battery sizes:
14500: Capacity is typically between 500mAh and 900mAh.
16340: Capacity is mostly around 250mAh to 800mAh.
18650: capacity range is wider, usually from 1200mAh to 3500mAh or even higher.
21700: Capacity is usually between 3000mAh and 5000mAh.
26650: Capacity can reach 3000mAh to over 5000mAh.
In addition to the capacity, the performance indicators of lithium batteries also include the voltage, the maximum discharge current, the cycle life and so on. The nominal voltage of general cylindrical lithium batteries is 3.6V or 3.7V, and when fully charged, the voltage can reach 4.2 V. The cycle life is usually more than 300 to 500 times, and depending on the quality of the batteries and the conditions of use, some can reach more than 1000 times.
Because in addition to the previously mentioned devices such as laptops, flashlights, and e-cigarettes, Lithium Cylindrical Batteries are also widely used in a variety of occasions and products that require stable energy. The following are some of the main application areas:
Portable electronic devices: e.g., cellular phones, digital cameras, mobile media players, etc.
Electric transportation vehicles: e.g., e-bikes, e-scooters, Tesla in electric cars, and a number of other brands use cylindrical lithium batteries.
Energy storage systems: Cylindrical lithium batteries are also used in solar power or wind power energy storage systems.
Medical equipment: Surgical instruments, portable monitoring equipment and other medical devices are also increasingly using cylindrical lithium batteries.
Industrial and military use: In industrial equipment and military equipment, such as drones and submarines, cylindrical lithium batteries are widely used due to their high reliability and powerful power output.
Cylindrical Li-ion batteries, with their excellent electrochemical properties, stable physical shape, and relatively mature production process, have a wide range of far-reaching applications in the field of electronic equipment and new energy. With the continuous development of science and technology, we expect more innovative materials and technologies to be used in the future to improve the performance of lithium cylindrical batteries, so as to meet the growing energy needs of people.
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