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Isothermal charging/discharging experiment

Type of sample: Coin Cell ModuleA calorimeter module being part of the Multiple Module Calorimeter (MMC) allowing for scanning and isothermal tests of complete coins of variable size. The DSC-like twin design gives a differential signal of the heat signature during a heating ramp or charging and discharging of batteries.Coin Cell LiR2032
IsothermalTests at controlled and constant temperature are called isothermal.Isothermal mode with temperature
set at 40°C
Charging/Discharging cycle
Constant current Constant voltage
(CC-CV) – 40 mA from 4.2 V to 3.0 V

The data shows that charging is characterized by a short endotherm followed by a small ExothermicA sample transition or a reaction is exothermic if heat is generated.exothermic reaction while discharging is characterized by a long ExothermicA sample transition or a reaction is exothermic if heat is generated.exothermic reaction. Cycles are reliably repeatable.

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Heat flow and voltage data graph illustrating isothermal charging and discharging cycles of LiR2032 coin cell at 40°C. — IsothermalTests at controlled and constant temperature are called isothermal.Isothermal charging/discharging of LiR2032 Coin Cell ModuleA calorimeter module being part of the Multiple Module Calorimeter (MMC) allowing for scanning and isothermal tests of complete coins of variable size. The DSC-like twin design gives a differential signal of the heat signature during a heating ramp or charging and discharging of batteries.coin cell

The same data was used to calculate the cell efficiency during charging and discharging.

Graph depicting battery charging and discharging efficiency for LiR2032, showing heat flow and power changes over time at 40°C. — Battery Power, Heat Flow and Temperature as a Function of Time