7.4v lithium battery charging and discharging principle:

The working principle of lithium ion battery is its charge and discharge principle. When the battery is charged, lithium ions are formed on the positive electrode of the battery, and the lithium ions generated move to the negative electrode through the electrolyte. Carbon, as a negative electrode, has a layered structure, and it has many micropores. The lithium ions that reach the negative electrode are embedded into the micropores of the carbon layer. The more lithium ions embedded, the higher the charging capacity.

Similarly, when a battery is discharged (the process by which we use the battery), lithium ions embedded in the negative carbon layer escape and move back to the positive electrode. The more lithium ions that return to the positive electrode, the higher the discharge capacity. We usually say the battery capacity refers to the discharge capacity.

It is not difficult to see that during the charging and discharging process of lithium ion battery, lithium ion is in the motion state from positive pole to negative pole to positive pole. If we think of the lithium ion battery as a rocking chair, the two ends of the rocking chair are the two poles of the battery, and the lithium ion is like a good athlete, running back and forth between the two ends of the rocking chair. So the experts have come up with a cute name for the lithium-ion battery: the rocking chair battery.