Energy cells versus power cells
Why a long-range saloon and a hot hatch use different cells at the same chemistry.
You'll learn
- Explain energy cells versus power cells at engineering level
- Read the numbers that define the behaviour
- Apply the idea to a real pack
Overview
Thicker electrodes store more energy but resist current. Thinner electrodes deliver current but store less. Every pack sits somewhere on that line.
In depth
Internal resistance is the hinge. A power cell has thin coatings, more current collector foil and higher porosity, so resistance falls — at the cost of the inactive material fraction rising and energy density falling.
Energy cell
Power cell
Energy cell vs power cell
- ThickElectrode thicknessThin
- HigherInternal resistanceLower
- HigherEnergy densityLower
- 1–2CSustained C-rate4–10C
- MoreHeat generated at high powerLess
Key takeaways
Remember this
- Electrode thickness trades energy against power.
- Internal resistance drives heat and voltage sag.
- Pack size can substitute for cell power capability.
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