Week 1 - Introduction Flashcards
What is energy?
A quantity associated with the evolution of a physical system in time.
Any closed system described by a time-invariant physical system…
Has a conserved quantity called energy.
What are the stores of energy?
- Kinetic/Mechanical
- Chemical
- Gravitational Potential
- Electromagnetic
- Thermal
- Osmotic Potential
- Electrochemical
- Nuclear
Conservation of Energy Principle
Energy can neither be created nor destroyed, but only changed from one form to another.
Energy storage technologies can…
Balance short and long-term fluctuations in supply and demand.
Potential (E, Volt)
Difference in electrical potential between electrodes.
Capacity (Q, mAh/g)
Amount of electricity stored.
Gravimetric energy density (specific energy) (Wh/kg)
E x Q ; Amount of energy stored per unit weight.
Volumetric energy density (Wh/L)
E x Q ; Amount of energy stored per unit volume.
Energy (Wh ; duration of delivery)…
vs Power (W).
Depth of Discharge (DoD)
How much of the capacity is used during discharge (as a decimal).
Cycle Life
The amount of full equivalent cycles during the device’s lifetime.
Calendar Life
Capacity fade during storage.
Charge/Discharge Rate
Speed of charge/discharge.
Ragone Plots
Diagrams used to compare the amount of stored energy.
