Hot-disk method

Example

Use in Lemonergy

Record specimen, state, instrument, temperature and timing.

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Connected concepts

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Laser flash analysis

Firing a brief laser pulse at one face of a thin disc and timing the temperature rise on the far face with an infrared detector, which gives thermal diffusivity. Multiplying by density and specific heat yields thermal conductivity — the through-plane value for electrodes, separators and layered cell samples.

Thermal characterisation

Measuring the thermal properties a model needs: specific heat capacity in a calorimeter, thermal conductivity through and along the layers, the entropy coefficient from OCV against temperature, and heat generation under load. Without them a thermal model is a guess.

Thermal interface material

A soft, thermally conductive paste or pad that fills the gap between cells and the cooling plate so heat does not have to cross air. It is dispensed by the kilogram in a pack and is a surprising share of its cost.

Thermal model

A model of cell temperature: at its simplest one thermal mass with heat generation inside and convection outside, at its most detailed a 3D simulation of the pack. Temperature feeds back into every rate, so electrical and thermal models are usually solved together.

References & further reading

Further reading on this topic

These sources provide broader context; they are not presented as citations for every statement in this entry.

1. Battery Test Manual For Electric Vehicles, Revision 3

   Jon P. Christopherson · Idaho National Laboratory · 2015

   Topic background · Performance characterization, pulse resistance/power, life testing and reference performance tests; historical 2015 edition.