Step #3: Charge and Test
After the electrolyte is injected into the electrolyte, no electricity is actually stored. At this time, the states of the positive and negative electrodes have not reached a stable state and must be charged through the first charge before they can be used normally.
This first charge is called “chemical reaction”. When charging for the first time, an extra charge is required to create a protective film on the electrode surface. This protective film is the secret of the low self-discharge of lithium-ion batteries. At the same time, the properties of the protective film also affect the performance and life of the battery. Therefore, the formation process is very important. Chemical conversion is accomplished using a volumetric cabinet.
The batteries are filled with chemicals. In order to ensure the safety and lifespan of the batteries, they must be packed in boxes before packing, usually, 200 pcs per box. We will make sure they are consistency in: capacity, internal resistance, and voltage. If not, they will be identified as B-level and C-level batteries.