Size and type of standard 18650 lithium battery

What does the standard 18650 lithium ion battery look like? As the most widely used lithium ion battery in the industry, the 18650 lithium ion battery is basically a standardized battery specification. What about the standard 18650 lithium ion battery? It is explained from three aspects of size, type and electrochemical performance: 18650 lithium ion battery 1. Standard size 18650 lithium ion battery These numbers, 18650, indicate the external size of the battery: 18 indicates The diameter of the battery is 18.0mm, and 650 means the height of the battery is 65.0mm. Due to the difference of the manufacturer's production process level and method, the size is allowed to have a certain error, ±0.02mm. 2.18650 battery type: ordinary 18650 battery is divided into lithium ion battery, lithium iron phosphate battery and nickel hydrogen battery. In fact, lithium iron phosphate batteries are one type of lithium ion batteries, so strictly speaking, there should be two types of 18650 batteries. The voltage and capacity specifications of various 18650 batteries: the voltage of 18650 nickel-metal hydride batteries is 1.2v, the general capacity is 2500 mA, the voltage of 18650 lithium ion batteries is 3.6v, and the general capacity is 1500MAH-3100MAH3.18650. Electrochemistry of lithium ion batteries Performance Single cell rated voltage is generally 3.6v or 3.7v. Charging voltage is generally 4.20v. The minimum discharge end voltage is generally 2.75v. Below this voltage, the battery capacity may be severely reduced or even scrapped. Maximum charge end voltage: 4.20v Capacity: 1000mAh Above, some brands will come standard with amazing capacities such as 3600mAh or 4500mAh. At present, Sanyo has the highest 18650 battery capacity, which can make 3100mAh, but the price is not low. The 18650 lithium-ion battery is 3.7 volts or 4.2 volts, which is the same. It's just that the manufacturer's mark is different from itself. 3.7v is the platform voltage (average voltage) when the battery is discharged during use, and 4.2v is the voltage when the battery is fully charged. Common 18650 rechargeable lithium-ion batteries, the voltage is 3.6 or 3.7v, the charge is 4.2v, which is very little power (capacity), the mainstream mah of 18650 battery capacity is from 1800 to 2600mah, (more than 18650 power lithium battery capacity is 1200 ~1600mah), the mainstream capacity even exceeds 3500 or 4000mah (warning that over 3100mah, 18650 is not credible, the qi is serious, the world is not such a large capacity 18650 cells). It is generally believed that if the no-load voltage of the lithium-ion battery is set to 3.7v, it is considered that the discharge of the lithium-ion battery should not be set below 3.7v, otherwise excessive discharge will cause damage to the battery. 4.2v is the highest limit voltage for battery charging. It is generally believed that charging the no-load voltage of a lithium-ion battery to 4.2v means that the battery is fully charged during the charging process. The battery voltage has gradually increased from 3.7v to 4.2v. Statement: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: How to use the formula to calculate the charging time of the Ni-MH battery?