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Assessing Body Temperature - Oral01:14

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sensor Technology

Background:

  • Lithium-ion battery performance, stability, and lifespan are temperature-dependent.
  • Electric vehicles require robust temperature and humidity monitoring to prevent battery failure.
  • Existing sensors face challenges with leakage and short circuits in demanding environments.

Purpose of the Study:

  • To fabricate an integrated humidity and temperature sensor directly onto pouch-type battery films.
  • To evaluate the performance of a novel sensor for enhanced battery management systems.
  • To improve the safety and efficiency of lithium-ion batteries in electric vehicles.

Main Methods:

  • Screen-printing of interdigitated electrode (IDE) patterns on pouch film.
  • Dispenser printing of silver-nanofiber composite (Ag-CNF) for humidity sensing (capacitance-based).
  • Dispenser printing of PEDOT:PSS for temperature sensing (resistance-based).
  • Integration and performance testing of the dual-sensing electrode.

Main Results:

  • The integrated sensor demonstrated a resistance change (ΔR ≈ 0.14) across a 20 °C to 100 °C temperature range.
  • The sensor showed a capacitance change (ΔC ≈ 2.8) with relative humidity variations from 20% RH to 80% RH at 20 °C.
  • Successful integration of humidity and temperature sensing functionalities into a single unit.

Conclusions:

  • A novel, integrated humidity and temperature sensor has been successfully fabricated on pouch film.
  • The sensor exhibits reliable responses to both temperature and humidity fluctuations.
  • This technology is poised to enhance monitoring capabilities in pouch-type lithium-ion batteries, improving safety and longevity.