1: Discharge current

When the battery is connected with electrical appliances or loaded, the current generated is called discharge current. The unit is ampere, a for short.

2: Internal resistance of battery

The resistance of current flowing through the battery is called internal resistance, which includes ohmic internal resistance and polarization internal resistance.

The internal resistance of the battery is very small, generally in micro ohm or milliohm m Ω.

In general measurement occasions, the measurement accuracy error of battery internal resistance must be controlled within plus or minus 5%, so special instruments must be used for measurement. Different types of batteries have different internal resistance. The same type of battery, due to the internal chemical characteristics are not consistent, the internal resistance is not the same. Internal resistance is an important technical index of battery performance.

Under normal conditions, the battery with small internal resistance has strong discharge ability at high current, while the battery with large internal resistance has weak discharge ability.

3: Discharge termination voltage

When the battery is discharging, the voltage drops to the lowest working voltage value that the battery is not suitable to continue discharging. According to different battery types and different discharge conditions, the requirements for the capacity and life of the battery are also different, so the specified discharge termination voltage of the battery is not the same.

4: Constant current charging

In the process of charging, the current remains constant, which is called constant current charging.

This is a widely used charging method. The initial charging of the battery, the capacity inspection of the battery in operation, the charging of the traction battery in operation and the formation charging of the battery plate are mostly constant current or phased constant current charging.

The advantage of this method is that the charging current value can be determined according to the capacity of the battery, the charging amount can be calculated directly and the charging time can be determined.

5: Constant voltage charging

During the charging process, the voltage between the two poles of the battery is maintained at a constant value.

This is also a widely used charging method. The floating charge and trickle charge of storage battery in telecommunication device and UPS are all constant voltage charge. The starting battery is also in a similar constant voltage charging condition when the vehicle is running.

Its advantage is that with the change of the state of charge of the battery, it can automatically adjust the charging current. If the constant value of the specified voltage is appropriate, it can not only ensure the complete charging of the battery, but also reduce the gas evolution and water loss as far as possible.