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The rapid development of mobile electronic devices and electric vehicle markets has attracted much attention to 18650 lithium batteries as an important power source. This article will introduce the specifications and parameters of 18650 lithium batteries, providing a detailed analysis from basic parameters to application scenarios, to help readers better understand this important energy storage device.

Basic parameters

18650 lithium battery is a cylindrical lithium-ion battery, and the "18650" in its name represents its size specifications, with a diameter of 18mm and a height of 65mm. This standard size enables 18650 lithium batteries to be widely used in various devices, including portable electronic devices, power tools, electric vehicles, etc. In addition, the nominal voltage of 18650 lithium batteries is generally 3.7V, with a charging cut-off voltage of 4.2V and a discharging cut-off voltage of 2.75V. These basic parameters provide important reference for the design and application of 18650 lithium batteries.

Capacity and energy density

The capacity of 18650 lithium batteries is an important indicator for measuring their stored electrical energy, and the commonly used capacity units are milliampere hours (mAh) or ampere hours (Ah). Generally speaking, the capacity of 18650 lithium batteries ranges from 1000mAh to 3500mAh, and batteries with different capacities are suitable for different devices and scenarios, meeting the diverse needs in the market. In addition, energy density is also an important parameter for evaluating the performance of lithium batteries. The energy density of 18650 lithium batteries is usually between 150-250Wh/kg, and high energy density means higher performance and lighter equipment.

Charge and discharge characteristics

The charging and discharging characteristics of 18650 lithium batteries play a crucial role in their performance in practical applications. Charging rate and discharging rate are important indicators for evaluating battery performance, usually represented by the C value. Charging rate refers to the ratio of the maximum charging current allowed by a battery to its capacity, while discharging rate refers to the ratio of the maximum discharging current allowed by a battery to its capacity. In addition, cycle life is also an important indicator for evaluating battery quality, usually expressed in terms of the number of charge and discharge cycles. High cycle life means that the battery has a longer service life.

Security performance

The safety performance of 18650 lithium batteries is a highly concerned focus. Safety performance includes performance in short circuits, overcharging, overdischarging, high temperatures, and other aspects. Excellent 18650 lithium batteries should have good safety protection devices that can effectively prevent abnormal situations such as short circuits, overcharging, and overdischarging, and have good high temperature resistance. These safety features are crucial for ensuring the safety of batteries during use.

Application scenarios

18650 lithium batteries have been widely used in various application scenarios due to their moderate size, adjustable capacity, and high energy density. Mainly including portable electronic devices (such as laptops, digital cameras, drones, etc.), power tools (such as electric wrenches, electric scissors, etc.), and electric vehicles (such as electric bicycles, electric cars, etc.). 18650 lithium batteries with different capacities and performances can meet the power needs of different devices, and therefore have broad application prospects in these fields.

18650 lithium batteries, as an important power source, play a significant role in the mobile electronic device and electric vehicle markets. By understanding its basic parameters, capacity and energy density, charging and discharging characteristics, safety performance, and application scenarios, 18650 lithium batteries can be better selected and applied, promoting the development of battery technology and meeting the needs of different fields for energy storage devices.

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