Basic terms in electrical engineering: D - E (Glossary)

DBFC
DBFC stands for 'Direct Borohydride Fuel Cell', a modern fuel cell on the basis of sodium-borohydride with an Energy density of up to approx. 400 Wh/kg.

Decomposition voltage
A voltage above which the Electrolyte or other components of a battery are electrolytically decomposed. With aqueous solutions this Voltage is theoretically 1.23 volts, though it can be increased to around 2 volts using inhibitors.

Design
Batteries are manufactured in various designs, for example as prismatic cells, round or button cells.

Device battery
Batteries that are not fixed nor traction, starter or on-board batteries are called device batteries.

Discharging current
The current (I) that flows during discharging of a battery. Charging current

Electrode
Electrically conductive pole of a battery. The electrochemical reactions that generate the current take place at the electrodes of a battery.

Electrode reaction
Chemical reaction that takes place at the electrodes during charging or discharging of a battery.

Electrolyte
Generally fluid ion conductor between the electrodes of a battery. Common electrolytes include Sulphuric acid, Soda lye and Caustic potash solution.

Electrolytic gas
Highly explosive oxygen-hydrogen mixture. Can be produced by Gassing.

Electron
Negative charged elementary particle, carrier of an electrical charge.

End-point voltage
Lowest (permissible) Voltage for a cell or battery as defined by standards or

Energy density
The energy density (also: specific energy) is the available energy per unit of weight contained in a battery, generally expressed in terms of watt-hours per kilogram (Wh/kg). The volumetric energy density expresses the energy per unit of volume (Wh/l).
the manufacturer.

Energy, specific Energy density

Energy volume
Alternative name for the volumetric Energy density

Energy weight
Alternative name for Energy density

Equalizing charge
The equalizing charge is used in an accumulator with several cells to assimilate the weaker cells in the compound to the capacity of the fully charged cells. The equalizing charge normally consists of a long overcharge that does not damage the already charged cells.

Expanded graphite
Graphite that has been treated by oxidizing acids and heating to 650°C so that it decomposes into thin wafers.

© Marc Stenzel

	See also:
		Glossary overview Basic terms: A - C (Glossary) Basic terms: F - K (Glossary) Basic terms: L - M (Glossary) Basic terms: N - R (Glossary) Basic terms: S - X (Glossary)

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Keywords: accumulator accumulators secondary cell cells rechargeable battery batteries