Thermal conductivity in a battery cell

Batteries challenge

Battery manufacturers are currently challenged to produce large volumes of smaller, lighter, and cheaper lithium batteries.

These higher energy density packs deliver more power, over a longer period of time, but to do so they need to avoid overheating and heat spikes, i.e. better thermal control.

Thermal control

In order to maintain proper operation of a battery cell, cooling must be applied to its outer surface since it is not possible to cool the entire active area of the electrodes. This is necessary to prevent temperature gradients, but also poses a challenge as it reduces the overall energy density of the battery.

To overcome this, thermal conduction must be taken into account when cooling the cell.

Thermal Conductivity

Thermal conduction or Thermal conductivity is the ability of a substance to transfer the kinetic energy of its molecules to other adjacent molecules or substances with which it is in contact, i.e., the physical property of materials that measures the ability to conduct heat.

The higher the thermal conductivity of a material, the better it conducts heat.

The solution

To extend a material’s lifetime, power, and performance, Coolmag has developed a range of products based on a thermally conductive, flame-retardant, two-component potting resin that combines easy processing with improved thermal conductivity.

The application of this range of resins maintains batteries electrically and ionically as it conducts heat while maintaining the safety level of the battery after numerous charge and discharge cycles.

This range of resins has been formulated to meet customer needs, more or less conductivity, more or less density, etc. It is also versatile as it can be used either for encapsulation or as a liquid gap filler.

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Temperature and Heat management in Power Electronics for EVs

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