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Portable Power Station Parameters 2: Energy Density

Energy Density

This blog is about Battery Energy Density

The energy density is the amount of energy that can be stored, per cubic meter of battery volume, expressed in Watt-hour per cubic meter (Wh/m3 ). This is a very important parameter to select a specific battery technology for transportation applications, where space availability is critical.

In fact, lithium-ion batteries’ energy density ranges between 260-270 wh/kg, while lead-acid batteries range from 50-100 wh/kg.

Which battery has the highest energy density?

Li-ion batteries are capable of having a very high voltage and charge storage per unit mass and unit volume.

Current lithium-ion batteries store about 0.5 MJ/kg and have a theoretical upper limit of about 3 MJ/kg. There are other, theoretical chemistries beyond that, but it is unlikely that any will ever approach the energy density of hydrocarbons, at about 50 MJ/kg.

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