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Related Concept Videos

P-N junction01:11

P-N junction

822
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Peltier effects in lithium-ion battery modeling.

Lena Spitthoff1, Astrid Fagertun Gunnarshaug2, Dick Bedeaux2

  • 1Department of Energy and Process Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.

The Journal of Chemical Physics
|March 23, 2021
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A new thermal model for lithium-ion batteries incorporates Peltier and Dufour heat effects, revealing their significant impact on internal temperature rise and heat flux. Precise knowledge of these effects is crucial for battery performance and safety.

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Area of Science:

  • Thermodynamics
  • Electrochemistry
  • Battery Technology

Background:

  • High battery temperatures critically impact lithium-ion battery performance, degradation, and safety.
  • Accurate understanding of heat sources and sinks within batteries is essential for thermal management.

Purpose of the Study:

  • To develop an advanced thermal model for lithium-ion batteries.
  • To incorporate Peltier and Dufour heat effects into battery thermal modeling.
  • To systematically analyze heat, mass, and charge transport coupling.

Main Methods:

  • Developed a thermal model using non-equilibrium thermodynamics for heterogeneous systems.
  • Treated surfaces as two-dimensional layers with excess variables, including surface temperature.
  • Analyzed the impact of Peltier and Dufour heats on single cells and battery stacks.

Main Results:

  • The model includes Peltier and Dufour heat effects, previously omitted.
  • These reversible heat effects can cause an internal temperature rise of 8.5 K in a battery stack.
  • Heat fluxes are shown to be functions of Peltier and Dufour heats.

Conclusions:

  • Peltier and Dufour heats significantly influence lithium-ion battery thermal behavior.
  • Further progress in thermal modeling requires improved experimental data on surface resistances, transport coefficients, and reversible heat effects.
  • Accurate thermal modeling is vital for enhancing lithium-ion battery performance and safety.