Hybrid energy storage system

Example

Use in Lemonergy

Start with mission energy, peak power and operating conditions.

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Connected concepts

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Lithium titanate

A negative active material, Li₄Ti₅O₁₂, that works at about 1.55 V above lithium, so it never plates lithium and forms almost no SEI. The price is a low cell voltage of about 2.4 V and low energy density, traded for very long life and fast charging.

Power cell and energy cell

Two design points of the same chemistry: a power cell has thin, porous electrodes and many tabs for high current and fast charging; an energy cell has thick, dense electrodes for maximum watt-hours. A hybrid car wants the first, a long-range car the second.

Ragone plot

A log–log chart of specific power against specific energy on which each storage technology occupies a region. Capacitors sit high and left, batteries lower and right, and a single cell traces a curve as it is discharged faster.

Regenerative braking

Using a vehicle’s motor as a generator while slowing down, so braking energy charges the battery in short high-current pulses. A cold or full battery cannot accept it, which is one reason a BMS computes charge power limits continuously.

Supercapacitor

A device that stores charge in the electric double layer on high-surface-area carbon rather than in a reaction. It delivers very high power and lasts a million cycles but stores only a few watt-hours per kilogram.

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. DOE/EPRI 2013 Electricity Storage Handbook in Collaboration with NRECA

   Sandia National Laboratories · 2013

   Topic background · Storage technologies and grid services. The publisher notes that its historical cost and deployment figures are outdated.