Lithium-ion batteries have the following characteristics: high energy density, high operating voltage, high output power, fast charging and low pollution. Therefore, although the unit energy price is still higher than other batteries, it is still the most valued commercial battery among various advanced batteries in recent years. So here is the introduction of lithium-ion batteries.

1. Plate performance test

Lithium-ion batteries are generally composed of a positive electrode containing lithium oxide and a negative electrode carbon material. Before assembling a batch of new batteries, the positive and negative materials will be individually made into Coin Cell half-cells, such as LiMn2O/Li half-cells, to test the unit capacity and charge-discharge characteristics. The relationship between the capacitance [C]-voltage [V] measured by a constant potentiometer. The charge cut-off voltage and discharge cut-off voltage can be determined from the optimal potential interval of the C-V curve, and then the theoretical capacitance can be converted by the actual total amount of activators, and the charge and discharge current value can be estimated.

2. Constant current and constant voltage charging

Charging start: charging with a certain current, and then charging at the set voltage value when the battery charging voltage reaches the set value. When the ion battery is charged at an improper voltage, it will easily affect the cycle life and even cause the electrolyte to decompose and cause danger. Therefore, it is not possible to use constant current charging methods that are commonly used for pots and nickel-metal hydride batteries to avoid the above problems. Li-ion batteries are better to use constant voltage charging, but there must be accurate charge cut-off voltage level control, otherwise there will be charging The problem of insufficient or reduced cycle life. Quasi-constant voltage charging is an example. Constant current and constant voltage charging method [CC-CV] existing [CC] charging rate