The details are as follows:
18650 is a lithium-ion battery and a standard lithium-ion battery model, where 18 means the diameter is of 18mm, and 65 means the length is 65mm, 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 generally 1200mAh to 3000mAh, the Common capacity is 2200 mAh to 3600 mAh.
How to buy lithium batteries
1. Is the capacity clearly marked? Batteries without clearly marked capacity (such as 1000 mAh or 1000 mAh) are most likely using lower quality batteries or recycled batteries. Many inexpensive batteries on the market are made from recycled batteries. Although they arecheap, their lifespan is short and their unstable quality can damage the phone.
2. Is there guaranteed standby time? Standby time is the duration of continuous use from the time the battery is installed in the phone until the next charge. Generally, batteries sold in the market cannot guarantee standby time to customers. This is because the battery quality is unstable. Many cheap batteries use poor quality battery cores, so the standby time is very short.
18650 is the size identification model, 18 is the diameter of 18mm, and 650 is the height of 65.0mm.
18650 is the creator of lithium-ion batteries - a standard lithium-ion battery model defined by the Japanese company SONY in order to reduce costs. 18 means the diameter is 18mm and 65 means the length is 65mm. .0 represents acylindrical battery.
Common 18650 batteries are divided into lithium ion batteries and lithium iron phosphate batteries. The rated voltage of lithium ion battery is 3.7V, the charging cutoff voltage is 4.2V, the rated voltage of lithium iron phosphate battery is 3.2V, the cutoff voltage charging is 3.6V, capacity is generally 1200mAh. 3350 mAh, common capacity is 2200 mAh-2600 mAh.
Detailed information
Charging and discharging principle of lithium-ion battery
The working principle of lithium battery -ion refers to its principle of charge and discharge. When the battery is charged, lithium ions are generated on the positive electrode of the battery and the generated lithium ions move to the negative electrode via the electrolyte. The carbon used as a negative electrode has a layered structure with numerous micropores. Lithium ionswhich reach the negative electrode are integrated into the micropores of the carbon layer. The more lithium ions, the higher the charging capacity.
Similarly, when the battery is discharged (that is, the process when we use the battery), the lithium ions embedded in the carbon layer of the negative electrode are released and return towards the positive electrode. The more lithium ions that return to the positive electrode, the higher the discharge capacity. What we usually call battery capacity refers to the discharge capacity.
It is not difficult to see that during the charging and discharging process of lithium-ion batteries, lithium ions are in a state of movement from the positive electrode → the negative electrode → the positive electrode. If we compare the lithium-ion battery to a rocking chair, the two ends of the rocking chair are the poles of the battery, and theLithium ions are like excellent athletes, running back and forth at both ends of the rocking chair. So, experts have given the lithium-ion battery a nice name: rocking chair battery.
Reference materials:
Baidu Encyclopedia_ 18650 lithium battery