Battery capacity and temperature

Date:Aug 16, 2019

Battery capacity and temperature

The capacity of the battery is closely related to the temperature around it, that is, there is an inverse ratio function. We see that the capacity indicated on the battery is calculated according to the standard temperature (temperature) 25 ° C. When the temperature drops by 1 ° C, the relative capacity drops by about 0.8%. This is not difficult to explain why the capacity of electric car batteries in winter will be smaller. If you master the relationship between capacity and temperature, it is important to judge the repair result in the battery repair process. For example, when the temperature or ambient temperature is 0 °C, the battery 5A after the repair is discharged for 100 minutes. Regardless of the ambient temperature, the calculated capacity is about 8 AH, but the ambient temperature is 25 ° C lower than the standard temperature. It has dropped by about 20%. If this factor is added, the battery should be calculated to reach the standard battery capacity of 10AH.


For electric vehicle batteries, the national standard is to discharge at a 2 hour discharge rate (2 hr).

Then the formula for calculating the battery capacity is as follows:

2 hour discharge rate × discharge current = battery capacity

The calculation formula of the discharge current of the battery:

The battery of 10AH is discharged at 2hr, then the current of the discharge is calculated as follows: 10÷2=5(A)

In other words, the battery discharge current of 10AH is 5A.

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