The gel cell uses a silica added to the electrolyte to form a gel which
liquifies above some fixed stress level, and converts back into a gel
when left standing. Only the electrolyte between and around the
plates will gel. The electrolyte in the pores of the plates and
microporous separators remains liquid.
Material composition of the positive plate, such as lead calcium,
lead antimony, or lead selenium.
Increase in dimension of lead-battery plates caused by oxidation of
metallic lead grids into lead dioxide, which consumes more volume.
A sinusoidal component of a periodic wave or quantity having a
frequency that is an integral multiple of the fundamental frequency.
For example, a third harmonic is equivalent to three times the
A tool or device which has conductive parts and is either coated or
covered with a dielectric material.
Limiting Oxygen Index
The flammability index of the plastic material used in the
construction of the battery jar. LOI ratings of 28 or greater are
desirable due to the plastic's ability to withstand fires rather than
contribute to them.
A selected cell whose condition is assumed to indicate the condition
of the entire battery string. The pilot cell is usually selected for
representative measurements for a select period of time. Once this
time period has elapsed, another cell from the battery string is
selected in turn to be the pilot cell.
The grid and active material from which current flows to the
external circuit when the battery is discharging. The positive plate
can be composed of pure lead or a lead alloy such as calcium,
antimony, or selenium.
Cell in which the internal environment is controlled and isolated
from the external atmosphere, often by using some form of vent
valve. Sealed cells often charge at above-ambient conditions to
promote recombination. The electrolyte of a sealed valve-regulated
type cell resembles petroleum jelly, versus a liquid solution as found
in flooded-cell batteries.
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