The relationship between voltage and capacity of lithium iron phosphate battery
May 12, 2022
The nominal voltage of the lithium iron phosphate battery is 3.2V, the high end charge voltage is 3.6V, and the low end discharge voltage is 2.0V. Due to the different quality and process of positive and negative electrode materials and electrolyte materials used by various manufacturers, there will be some differences in their performance.
Take 12.8V100AH for example:
1. Lithium iron phosphate battery charging voltage: 10A standard charging
The voltage point of 25% capacity in the charging state is 13.41V
The voltage point of 50% capacity in the charging state is 13.51V
The voltage point of 75% capacity in the charging state is 13.63V
The voltage point of 100% capacity in the charging state is 14.61V
2. Discharge voltage of lithium iron phosphate battery: voltage point corresponding to 0.5C discharge
The voltage point of 5% capacity in the discharge state is 11.90V
The voltage point of 10% capacity in the discharge state is 12.24V
The voltage point of 25% capacity in the discharge state is 12.55V
The voltage point of 50% capacity in the discharge state is 12.74V
The voltage point of 75% capacity in the discharge state is 12.85V
What is the relationship between voltage and capacity of lithium iron phosphate battery?
1. Generally speaking, the higher the charge and discharge voltage of a lithium iron phosphate battery, the greater its capacity. The charge and discharge voltages of lithium-ion batteries of different materials are different;
2. For the same lithium iron phosphate battery, in the case of the same residual capacity, the voltage value changes due to the magnitude of the discharge current. The higher the discharge current, the lower the voltage. In the absence of current, the voltage is the highest;
3. The influence of ambient temperature on battery voltage, the lower the temperature, the lower the battery voltage of the same capacity;