Thermal Management Data//iso-BTC
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Power Management Data

Battery Power Managament

The power (ie heat output rate) changes inside a battery and the actually cooling or heating duty which a power management system has to provide, can be measured directly with an isothermal battery testing calorimeter (iso-BTC).

Battery power loss (ie heat wasted) is shown in the graph, for a 3-cell Li-ion battery, charged at 5A and then discharged at 10A while the battery temperature is held constant at 45C. When the battery is charged, the battery becomes colder (a very small temperature depression is visible) and iso-BTC provides heat to the battery when the battery is discharged, temperature starts to rise (quite clearly) hence the iso-BTC must remove energy. A peak cooling rate of around 12W is recorded.