The development history and performance of 18650 lithium ion battery

18650 is the originator of lithium-ion batteries, which is the standard lithium-ion battery adopted by Sony Corporation of Japan in order to save costs. 18 is a diameter of 18mm, 65 is a length of 65mm, and 0 is a cylindrical battery. Ordinary 18650 batteries are divided into lithium ion batteries and lithium iron phosphate batteries. The nominal voltage of the lithium ion battery is 3.7v, the charge cut-off voltage is 4.2v, the nominal voltage of the lithium iron phosphate battery is 3.2v, the charge cut-off voltage is 3.6v, the general capacity is 1200mAh-3000mAh, and the general capacity is 2200mAh-2600mAh. The lithium ion battery is 3.7v or 4.2v. It's just that the manufacturer's mark is different from itself. 3.7v is the platform voltage (typical 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 2200 ~3600mah), the mainstream capacity even exceeds 3500 or 4000mah (remind everyone that batteries higher than the nominal domestic market of 3200mah are fake, and the current domestic maximum production capacity is 2600 mAh). It is generally believed that if the no-load voltage of the lithium-ion battery is lower than 3.0v, the battery is considered to be dead (the specific value is determined by the threshold of the battery protection board, such as as low as 2.8v, 3.2v). Most lithium-ion batteries cannot be discharged under a no-load voltage below 3.2v, otherwise over-discharge will cause damage to the battery (generally, lithium-ion batteries on the market only use batteries with a protective plate, so over-discharge will also cause a protective cover The battery cannot be detected, so the battery cannot be charged). 4.2v is the highest limit voltage for battery charging. It is generally believed that the no-load voltage of a lithium-ion battery is charged to 4.2v, that is, the battery is fully charged. When the battery is charged, the battery voltage gradually rises from 3.7v to 4.2v. The theoretical battery life is 1000 times. The density of the unit capacity is very large, so most of the laptop batteries, in addition, the stability of work in 18650 is very good, widely used in the electronic field: often used in high-end flashlights, portable power, wireless data transmission, electric thermal clothing, shoes And portable instruments, portable lighting, portable printers, industrial equipment, medical equipment, etc. Disclaimer: 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: What is the difference between polymer lithium ion battery and liquid lithium ion battery?