Battery Calorimetry with heat flux sensors
Heat flux sensor measurement

Battery Calorimetry with heat flux sensors


This short review describes how battery calorimetry evaluation can be performed with heat flux sensors. Indeed, battery calorimetric measurements are key for battery quality and safety control, and general battery research purposes.


Introduction to Battery Calorimetry with heat flux sensors


About the importance of calorimetric measurements of batteries

Batteries produce heat during the charging and discharging phases.

Knowing the amount of this heat is of great importance for battery quality and safety control but also for battery-related research. Nowadays, calorimetric measurements of batteries are common practice in both industrial and research environments.

Nonetheless, standard battery calorimeters are expensive. In addition, measurements performed with battery calorimeters are time consuming compared to other measuring systems.

greenTEG developed heat flux sensors calorimetric measurements that allow affordable and feasible calorimetric measurements of batteries for various systems and applications.


How to perform battery calorimetry with heat flux sensors


greenTEG’s gSKIN® Heat Flux Sensor for calorimetric measurements of batteries


Advantages

  • Miniature & Compact
  • High sensitivity
  • Facilitated integration
  • Precise heat flux measurement into and out of the battery system.
  • Determination of the charging and discharging signal of the battery.
  • Enhanced monitoring to increase the lifetime and charging speed.
  • Determining the System Health Status.
  • Evaluation of thermal capacity for a faster determination of inner temperature during use.

Live Demonstration


greenteg heat flux sensor

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Example of Battery Calorimetry Application

Battery calorimetry
Example of calorimetric measurements performed with heat flux sensors.

During charging and discharging Li-ions are intercalated or removed from the electrode.

When no more space is available, the Li-ions undergo a phase transition, in order to intercalate more ions.

The same phase transitions also occur during discharging of the electrode.

These transitions are accompanied by thermal energy release or uptake, which can be detected with greenTEG’s Heat Flux Sensors. Any change in the electrode or electrolyte quality can be detected accordingly. Hence, entropy profiling is a powerful tool for:

  • Battery quality determination (End of Line testing)
  • State of Health determination
  • Life time and aging investigation (Second Life)
  • Electrode and electrolyte research

References

(1) Kenza Mahler and Richid Yazami; A thermodynamic and crystal structure study of thermally aged lithium ion cells: Journal of Power Source 261 (2014) 389-400 (Reference for SOH determination based on calorimetric footprints of batteries)
(2) greenTEG Q&A Thermal characterization of batteries using heat flux sensors available here.
(3) Case Study: Monitoring Heat Generation in Batteries available here.
(4) Summary: Calorimetric Measurement of Batteries available here.
(5) Battery Entropy Profiling with greenTEG’s Heat Flux Sensors available here.
(6) Heat flux sensors for battery monitoring available here.
(7) Rania Rizk, Hasna Louahlia, Hamid Gualous, Pierre Schaetzel: Experimental analysis and transient thermal modelling of a high capacity prismatic lithium-ion battery: International Communications in Heat and Mass Transfer (2018, Vol. 94: 115-125)