- Cell sealed by means of a valve to maintain a predetermined pressure within the cell.
- Material used for sealing covers to the battery container.
secondary cell or battery
- A rechargeable battery.
- See mud.
- The space between the bridges in the lower part of the battery container in which the mud collects.
- Discharge which takes place while the battery is on open circuit, caused by local actions (see local action).
- Porous material placed between plates of opposite polarities to prevent internal short circuits.
- A circuit in which the positive pole of a battery is connected to the negative pole of the next battery.
- The separation of active material from the plate during operation.
- The ability of a battery (measured in unit time) to retain its charge on open circuit.
- A circuit through a low resistance, either external or internal to the battery.
- That current delivered when a cell is short-circuited (i.e., the positive and negative terminals are directly connected with a low- resistance conductor).
- An electrode construction in which active materials are deposited in the interstices of a porous metal matrix made by sintering metal powder.
- A battery designed to start internal combustion engines and to power the electrical systems in automobiles when the engine is not running (starting, lighting, ignition).
- See energy density.
- Weight per unit volume of a liquid relative to that of water.
- See power density.
- The shape of the internal roll in a cylindrical cell. It is made by winding the electrodes and separator into a spiral-wound, jelly-roll, construction.
starved electrolyte cell
- A cell containing little or no free fluid electrolyte. This enables gases to reach electrode surfaces during charging and facilitates gas recombination.
state of charge (SOC)
- The available capacity in a cell as a percentage of rated capacity.
- A secondary battery designed for use in a fixed location.
- A rechargeable battery.
- Life of a battery when left unactivated in storage (See shelf life).
- In its common usage, the term refers to the formation of lead sulfate of such physical properties that it is extremely difficult, if not impossible, to reconvert it to active material.
synthetic separators - Separators
made of plastics and rubber-like materials.
- Formation conducted in tanks, the plates in each tank being in a parallel connection.
- A charge regime delivering moderately high rate charging current when the battery is at low state of charge and tapering the charging current to lower rates as the battery is charged.
- Positive or negative post of a battery used for making circuit connections.
- A condition whereby a cell on charge or discharge will destroy itself through internal heat generation caused by high overcharge or overdischarge current or other abusive condition.
- A liquid or gel whose viscosity decreases with shear.
- A continuous, low rate charge, the rate being just about sufficient to compensate for self-discharge losses.
tubular plate - A battery plate in
which an assembly of perforated metal or polymer tubes holds the active
unactivated shelf life
- The period of time, under specified conditions of temperature and environment, that an unactivated or reserve cell can stand before deteriorating below a specified capacity.
- Lead oxide prepared at a relatively low temperature and consequently containing a considerable amount of finely divided metallic lead.
unformed active material
- This term refers to the paste (either wet or dry) in a plate prior to formation.
utilization (%) - The percentage by
weight of the limiting active material present in an electrode, cell, or
battery that is electrochemically available for discharge at useful
- A normally sealed mechanism which allows for the controlled escape of gases from within a cell.
- A cell design in which a vent mechanism operates to expel gases that are generated during the operation of the cell.
- A release of gas either controlled (through a vent) or accidental.
- Unit of electromotive force, voltage or potential. The volt is the voltage between two points of a conductor carrying a constant current of one ampere, when the power dissipated between these points is one watt.
- A device used to automatically limit the charging current as the battery approaches a state of full charge as manifested by its voltage.
- An instrument for measuring voltage.
- Apparatus for determining the apparent density of an oxide. Usually known as a "Scott Volumeter."
volumetric - Relative to