EV Li-on Battery Thermal Runaway Testing: ''ARC-type'' BTC
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Low-Temp Phi-TEC BTC

Low-Temperature Thermal-Stability testing on the PhiTEC BTC adiabatic calorimeter

Increasing amounts of research into Li-ion batteries is performed at low temperatures while standard thermal screening calorimeters work only above room temperature. HEL's phi-tec adiabatic calorimeter has recently been extended to enable battery testing from sub-ambient temperatures and this feature relies on two important components:

  • Mechanical changes to enable the test section to be cooled, very simply and quickly using any available chiller which determines the lowest operating temperature.
  • Control software that allows stability testing from any initial temperature, without any need for recalibration.

In effect, the combination of above features immediately extends the working range to whatever the chiller is able to achieve. This means that a phi-tec designed for low temperature operation can be run in exactly the same way as standard systems without any influence on the normal, high temperature testing.

Typical data for a chemical test is shown below where the evaluation starts at around -20&deg C (labelled as "can" temperature, representing the test sample) and step-wise heating is performed with an assessment at the end of each step until exothermic activity is finally detected (~ +20&deg C ) and from that point the sample is allow to self-heat exothermically. A battery or components of a battery could be tested in the exactly the same way.