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One of the most detrimental
conditions for a battery is high temperature, particularly above 131ºF (55ºC), because
the rates of corrosion, solubility of metal components, and self-discharge
increase with increasing temperature. High operating temperature during
cycle service requires higher charge input to restore discharge capacity
and self-discharge losses. More of the charge input is consumed by the
electrolysis reaction because of the reduction in the gassing voltage at
the higher temperature. While 10% overcharge per cycle maintains the state
of charge at 77º to 95ºF (25 to 35ºC), 35 to 40% overcharge may be required
to maintain state of charge at the higher operating temperatures. On float
service, float currents increase at the higher temperatures, resulting in
reduced life. Eleven days float at 167ºF (75ºC) is equivalent in life to
365 days at 77ºF (25ºC). Batteries intended for high-temperature
applications should use a lower initial specific gravity electrolyte than
those intended for use at normal temperatures. Manufacturers should be
consulted on acceptable temperature ranges for operation of their batteries
and on the associated effects of temperature. Nickel-cadmium batteries may
be more suitable for higher-temperature applications.
Additional information:
EN: Temperature coefficient (of the capacity)
Quotient of the change
in capacity of a cell by the corresponding change in temperature.
FR:
Coefficient de température (de la capacité), m.
Quotient
de la variation de capacité d’un élément par la variation correspondante de
temperature.
DE: Temperaturkoeffizient (der Kapazität),
m.
ES: Coeficiente de temperatura (de la
capacidad).
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