18650 lithium ion battery and its type difference introduction

18650 Lithium-ion battery introduction 18650 is the originator of lithium-ion batteries-a standard lithium-ion battery model set by SONY in Japan in order to save costs, where 18 means a diameter of 18mm, 65 means a length of 65mm, and 0 means Cylindrical battery. Common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. The voltage of lithium ion battery is 3.6V and 4.2V, the voltage of lithium iron phosphate battery is 3.2V, the capacity is usually 1200mAh-3000mAh, and the common capacity is 2200mAh-3600mAh. Lithium ion battery (Li-ion, LithiumIonBattery): Lithium ion battery has the advantages of light weight, large capacity, no memory effect, etc., so it has been widely used. Many digital devices use lithium ion batteries as power sources, although their prices are relatively speaking. More expensive. Lithium-ion battery has a high energy density, its capacity is 1.5 to 2 times that of a nickel-hydrogen battery of the same weight, and it has a very low self-discharge rate. In addition, lithium-ion batteries have almost no memory effect and do not contain toxic substances and other advantages are also important reasons for their wide application. In addition, please note that lithium ion batteries are generally marked with 4.2Vlithiumionbattery (lithium ion battery) or 4.2Vlithiumsecondarybattery (lithium secondary battery), 4.2Vlithiumionrechargeablebattery (rechargeable lithium ion battery) in English, so users must see the appearance of the battery block when purchasing batteries. The mark prevents the cadmium-nickel and nickel-hydrogen battery from being mistaken for lithium-ion batteries because the battery type is not clearly seen. Different types of 18650 lithium-ion batteries Lithium-ion batteries standard 3.7V or 4.2V are the same. It's just that the manufacturer's label is different. 3.7V refers to the plateau voltage (ie typical voltage) of the battery discharged during use, and 4.2V refers to the voltage when the battery is fully charged. Common rechargeable 18650 lithium-ion batteries, the voltage is standard 3.6 or 3.7v, when fully charged is 4.2v, this has little to do with the power (capacity), the mainstream capacity of 18650 batteries from 1800mAh to 2600mAh, (18650 power lithium The battery capacity is mostly 2200~3600mAh), the mainstream capacity even has standard 3500 or 4000mAh or more (remind everyone that domestic batteries with a nominal value of 3200mAH or more on the market are fake, and the current mass-produced maximum capacity is 3600mAh.). It is generally believed that if the no-load voltage of the lithium-ion battery is lower than 3.0V, it is considered to be exhausted (the specific value depends on the threshold of the battery protection board, such as as low as 2.8V and 3.2V). Most lithium-ion batteries can’t discharge the no-load voltage below 3.2V, otherwise over-discharge will damage the battery (generally, lithium-ion batteries on the market are basically used with a protective plate, so over-discharge will also cause a protective plate. The battery cannot be detected, and the battery cannot be charged). 4.2V is the highest limit voltage for battery charging. It is generally considered that the battery is fully charged when the no-load voltage of the lithium ion battery is charged to 4.2V. During the battery charging process, the battery voltage gradually rises from 3.7V to 4.2V, and the lithium ion battery Charging can not charge the no-load voltage to more than 4.2V, otherwise it will damage the battery. This is the special place of lithium-ion batteries. 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: Structure, working principle and use of lithium iron phosphate battery