I use a hot water bath to set temperature for charging / discharging a li-ion battery. but I'm looking for a way to surround the battery with air, not water. what is your idea for setting the temperature.
A water[1] based thermal bath, for a (common size) cylindrical Li-ion battery inside a safe plastic bag, might be a solution. For a maintenance free thermal bath, and/or some high(er)[3] set temperatures (say, Tbath>50oC), one could propose an oil[4] material based thermal bath, also.
1. A water has a high heat capacity, so it is the best material for a thermal energy reservoir.
2. For an industrial (size) Li-ion battery, then a thermal fluid bath is proposed. It is an indirect heating system. A liquid phase heat transfer medium is heated and circulated to one or more heat energy users within a closed loop system.
3. An alternative liquid phase material for some low(er) set temperatures is a glycol based thermal bath.
4. A water and oil based (double) thermal bath has some more advantages.
If the temperature is set with a hot water bath, the heat transfer (between cell and water) reduce the temperature of cell during discharge process. Therefore, an error occurs in setting the real temperature of cell. Is an oven preferable to set temperature. whats your idea about heat transfer process and best method to set temperature.
An additional local temperature (T2) sensor[1] might be used as a feedback[2] loop to generate a finer control, as corrections to the thermal bath temperature T1. So, we have an adjustment for : Tset ~ T2, that is better[3] than the simpler setting of the Tset ~ T1.
1. A temperature (T2) sensor, hook up on the cell.
2. Feedback corrections based on the temperature difference : T2-T1.
3. An adjustment for each one cell, but a higher cost, for a multi-cell system.
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