lithium battery 18650 3.7v.A brief discussion on the basic principles of charging and discharging 18650 lithium batteries

　　A brief discussion on the basic principles of charging and discharging 18650 lithium batteries:

　　The working principle of lithium battery refers to its basic principle of charging and discharging. When charging the battery, lithium iron phosphate will be formed at the positive stage of the battery, and the formed lithium iron phosphate will enter the negative stage through the lithium battery electrolyte. As a negative-grade carbon, it has a lamellar structure and has a large number of micropores. The negative-grade lithium iron phosphate is placed in the carbon micropores. The more lithium iron phosphate is inserted, the greater the charging capacity of the battery. big.

　　Similarly, when the battery is charged and discharged (that is, the whole process of using the battery), the lithium iron phosphate placed in the carbon layer of the negative stage is adsorbed by the resin and continues to move back to the positive stage. The greater the lithium iron phosphate return flow, the greater the charge and discharge capacity; we generally refer to the charge and discharge capacity of the battery.

　　When the lithium battery is charged and discharged, the lithium iron phosphate moves from positive level → negative level → positive level; if we vividly compare the lithium battery brand to a rocking chair, the two sides of the rocking chair are the two sides of the battery, and the lithium battery is like exercise. Or, running back and forth on both sides of the rocking chair. Therefore, experts gave the lithium battery a cute name - rocking chair battery.

　　18650 lithium battery charging and discharging process:

　　Lithium battery charging operation is divided into two stages. The first stage is constant current power supply battery charging. When the battery voltage decreases, the charging head uses a DC circuit to charge the battery; the second stage is the constant voltage charging stage. When the battery voltage reaches a certain value , due to the characteristics of lithium batteries, if the working voltage is higher, it will be damaged. The charging head will fix the working voltage and the current will gradually decrease. When the current drops to a certain value (usually 1/10 of the set current ), disconnect the battery charging power circuit, the battery charging completion indicator light will light up, and the battery charging is completed.