GLOSSARY
a
Available Energy (AE) – for a given test data set, a value that represents the 3 kW constant power
discharge energy (in watt-hours) available over the energy range where the 42V power goals are
concurrently met, i.e., between SOEmax and SOEmin. (See the diagram following the glossary.)
Best Case Operating State-of-Energy (BCOSOE) – the highest energy state/condition above which the
pulse power and available energy goals can all be satisfied within the operating voltage limits.
This is the SOE point at which the Self-Discharge and Cold Cranking Tests are performed. (See
the diagram following the glossary.)
Charge – any condition in which energy is supplied to the device rather than removed from the device.
Charge includes both normal recharge and regen conditions.
Depth of Discharge – this term is generally not used in this manual because of the potential for confusion
with other testing protocols. All references to charging and discharging for 42V systems apply to
energy, not to ampere-hour capacity..
End of Life (EOL) – a condition reached at the point where the device under test is no longer capable of
meeting any one of the 42V goals. This is normally determined from reference test results, and it
may not coincide exactly with the ability to perform the life test profile (especially if cycling is
done at elevated temperatures.) The number of test profiles executed at end of test is not
necessarily equal to the cycle life per the goals.
End of Test (EOT) – a condition where life testing is halted, either because criteria specified in the test
plan are reached, or because it is not possible to continue the test.
Energy Margin – for a given test data set, the difference between the Available Energy and the energy
goal for a given application, expressed either in watt-hours or as a percent of the energy goal.
(See the diagram following the glossary.)
Fully Charged – The condition reached by a device when it is subjected to the manufacturer’s
recommended recharge algorithm. This state is defined as 100% state-of-charge.
Fully Discharged – The condition reached by a device when it has been discharged to the minimum
allowable discharge voltage (normally referenced to a constant power discharge at the 3 kW rate.)
(This minimum allowable voltage is the Minimum Operating Voltage V
min
in Table 1 unless the
manufacturer’s minimum discharge voltage is higher than V
min
.)
Maximum State-of-Energy (SOEmax) – the highest SOE value at which the regen pulse power goal can be
met for a given operating mode. (See the diagram following the glossary.)
Minimum State-of-Energy (SOEmin) – the lowest SOE value at which the discharge pulse power goal can
be met for a given operating mode. (See the diagram following the glossary.)
a
Only selected terms specific to this manual or those potentially misunderstood in the context of this manual are defined
here. A more comprehensive list of battery-related terms is found in the USABC Electric Vehicle Battery Testing Manual,
Reference 2 and the Handbook of Batteries, Reference 3.
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