Appendix C Definitions of Terms cont'd

DOE-SPEC-3019-96

Separator

Electrically insulating layer of material which physically separates

electrodes of opposite polarity. Separators must be permeable to

ions in the electrolyte, and may also have the function of storing or

immobilizing the electrolyte.

Specific Gravity

Ratio of the weight of a solution to the weight of an equal volume of

water at a specified temperature. Used as an indicator of the state

of charge of a cell or battery.

Temperature Correction

A factor used to compensate for battery temperatures other than

Factor (kt)

77F, which is the standard optimum rating for battery operation. At

temperatures above 77F, more capacity (ampere-hours) can be

obtained from the battery, but battery life is reduced. At

temperatures lower than 77, less capacity can be obtained, but

battery life is extended. Consult IEEE 450 for correction factors.

Terminal

External electric connections of a cell or battery, also referred to as

"terminal post" or "post."

Thermal Runaway

Process in which a cell undergoes an uncontrolled rise in

temperature due to the passage of increasing current (on short

circuit discharge or constant-voltage charging and equalization).

Chances of thermal runaway occurring can be reduced by utilizing a

temperature-compensated charger with the battery system. If

uncorrected, this condition can sometimes lead to fire and/or

explosion.

UPS

Uninterruptible power supply; a system designed to automatically

provide power when "normal" utility line power is lost, without delay

or transients.

END OF APPENDIX C

C-3