Enter the current and resistance of the battery into the calculator to determine the heat generated. Need help? Ask our AI assistant The following formula is used to calculate the heat generated by a battery. To calculate the heat generated, square the current and multiply it by the resistance. This will give you the heat generated in watts.
In this example, the heat generated can be expressed as 27.4kWh but when considering the mass of the battery we must consider this heat to be given up over a longer time than the actual discharge period of 15m. Not all manufacturers consider a time of 10 x the discharge time, but it is clear that the heat will not be given up instantly.
That is: lf a multicell battery is involved, then the total heat is the heat generated or absorbed by each cell multiplied by the number of cells in the battery (N). For example, during discharge, the total heat for a battery would be given by: where
Battery heat generation refers to the heat produced by a battery during its operation. This heat is primarily due to the internal resistance of the battery, which causes energy loss in the form of heat when current flows through it.
During recharging, most of the heat will be generated as losses up to the battery reaching 80% charged which will be the “constant current” part of the recharge. During the constant current phase i.e. up to 80% charged, the heat may be estimated using the I2R principal. From 80% to 100%, the float current may be used to calculate the heat.
Heat is generated on recharge, float charge and discharge. The heat generated on charge is finite, i.e. once the battery is fully charged no more heat is generated but at this point the battery enters the float charge phase and as long as the battery is on charge, heat is being generated.