If we were to visit a gymnasium as observers, we may notice two types of athletes there. The first could be what we might call power-athletes, able to lift their own weight although they soon tire. While the second might be skinnier people with loads of energy able to complete circuits non-stop. We compare energy versus power in batteries, because these range across a similar dimension.
When We Need Energy Versus Power in Batteries
We need to match our batteries, and our applications to avoid becoming frustrated. For example, a lead-acid starter battery delivers a shot of powerful electricity to crank a motor. Whereas, if you need a lead-acid battery for your mobility scooter, then one of our deep cycle ones should do the trick.
This distinction is a key distinguisher in battery design. To cite a different example, a high power lithium-ion cell with low internal resistance should release high current. Whereas a high resistance one might have greater energy density per unit of weight and size. A Ragone Plot as we illustrate above is a handy way to position a battery across these dimensions.
Towards a Better Theoretical Understanding
A Ragone Plot is a useful way to conceptualize the balance between energy versus power in batteries and capacitors, but it has limitations. Dechent and associates writing in American Chemical Society – see link below – explains it this way:
- Batteries have made significant progress off-setting power and density.
- However, each product specification often has conflicting demands.
- Cost, lifetime and temperature sensitivity are excluded from Ragone plots.
We therefore need a broader picture to fully grasp energy versus power in batteries. We hope this summary brought you closer to a better understanding of this complex dynamic, and that it will help you purchase the best battery for your application.
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