* What is capacity?
Capacity is a measure of battery performance. It represents the amount of energy released by the battery under certain environmental conditions (such as temperature, voltage, etc.).
* What factors affect the capacity data tested?
There are three common influencing factors, which are discharge rate, temperature, cut-off voltage.
1. Discharge rate
Discharge the same battery at different discharge rates, and the measured capacity data is different. So when we talk about capacity we need to know the rate of discharge. The larger the discharge rate, the smaller the measured capacity.
When the electrolyte temperature decreases, the electrolyte viscosity increases, the ions are subjected to greater resistance, the diffusion capacity decreases, the electrolyte resistance also increases, so that the electrochemical reaction resistance increases, some chemical substances can not be transformed normally. The ability to charge decreases, resulting in reduced battery capacity.
3. Cut-off voltage
When the battery discharge to a certain voltage value, the voltage drops sharply, in fact, the energy obtained is very small, if long-term deep discharge, the damage to the battery is considerable. Therefore, discharge must be terminated at a certain voltage value, the cut-off voltage is called discharge cut-off voltage. Setting discharge cut-off voltage is of great significance for prolonging battery life.