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Do you Know the Charging and Discharging Principle of 18650 Battery?

Feb. 12, 2020

As an 18650 Battery Factory, share with you.

Lithium ion battery: Lithium ion battery has the advantages of light weight, large capacity and no memory effect, so it is widely used-many digital devices use lithium ion battery as power source, although its price is relatively expensive. The energy density of a lithium-ion battery is very high, its capacity is 1.5 to 2 times that of a nickel-metal hydride battery of the same weight, and it has a very low self-discharge rate. In addition, SANYO Lithium Ion Battery has almost no "memory effect" and does not contain toxic substances and other advantages are also important reasons for its widespread use.

4.2 v 18650 Battery

4.2 v 18650 Battery

4.2 v 18650 Battery life theory for 1000 cycles of charging. Due to the large capacity per unit density, most of them are used in notebook computer batteries. In addition, 18650 is very stable in work and is widely used in major electronic fields: often used in high-end strong flashlights, portable Power supplies, wireless data transmitters, electric thermal clothing, shoes, portable instruments, portable lighting equipment, portable printers, industrial instruments, medical instruments, etc.

18650 means 18 mm in diameter and 65 mm in length. The size of the 5th battery is 14,500, with a diameter of 14 mm and a length of 50 mm. Generally, 18650 batteries are used more in industry, and rarely used in civilians. Common ones are also used in laptop batteries and high-end flashlights.

Charge and discharge principle

The working principle of a lithium-ion battery is its charging and discharging principle. 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 through the electrolyte. The carbon of the negative electrode has a layered structure, and it has many micropores. The lithium ions reaching the negative electrode are embedded in the micropores of the carbon layer. The more lithium ions are embedded, the higher the charging capacity.

In the same way, when the battery is discharged (that is, the process of using the battery), the lithium ions embedded in the carbon layer of the negative electrode come out and move back to the positive electrode. The more lithium ions returned to the positive electrode, the higher the discharge capacity. What we usually mean by battery capacity is the discharge capacity.

It is not difficult to see that during the charge and discharge process of lithium-ion batteries, lithium ions are in a moving state from positive electrode → negative electrode → 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 lithium ion is like an excellent sportsman, running back and forth between the two ends of the rocking chair. So, the experts gave the lithium-ion battery a cute name, rocker-type battery.