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23 Cards in this Set
- Front
- Back
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The negatively charged terminal of a battery,under discharge conditions, where chemical energy is stored.Chemicals at this terminal have a surplus of electrons availablefor donation. |
Anode |
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The negatively charged liquid electrolyte on theanode side of a flow battery or an electrochemical cell that isdivided into two compartments. |
Anolyte |
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The nominal energy rating of an energy storagesystem as measured in kilowatt-hours. In the context of solar,capacity refers to the power (kilowatt) rating of a PV system understandard test conditions; in the context of batteries, it describesthe amount of energy a system can deliver or absorb over thecourse of an hour, which will vary based on charge rate. Note thata battery’s nameplate capacity rating does not equal its usablecapacity, which is a function of other characteristics, such asallowable depth of discharge and system efficiencies, includinginverter, cabling and transformer losses. |
Capacity |
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The positively charged terminal of a battery underdischarge conditions that establishes an electromotive force.Chemicals at this terminal have a deficit of electrons. |
Cathode |
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The positively charged liquid electrolyte on thecathode side of a flow battery or an electrochemical cell that isdivided into two compartments. |
Catholyte |
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The rate at which a battery cancharge; 2. The rate at which a battery discharges relative to itsmaximum capacity; 3. The maximum safe continuous discharge rate for a battery. |
Charge rate (or C-rate): |
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One charge and discharge sequence. Note that allcycles are not created equally but vary in intensity based onC-rate and depth of discharge. |
Cycle |
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The rated number of charge-discharge cycles abattery supports based on a specific depth of discharge. |
Cycle Life |
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Needlelike metal accumulations on theanode of a battery that, if uncontrolled, can cause a hazardousshort-circuit condition. |
Dendrite Formation |
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The energy discharged from a battery, expressed as a percentage, relative to the total amount of stored energy. While some batteries support 100% depthof discharge, many do not. |
Depth of Discharge |
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The length of time that a battery candischarge at its nominal power rating. |
Discharge Duration |
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The amount of energy that a battery storesin relation to its volume. (See also specific energy.) |
Energy Density |
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A chemical medium that allows the flow ofelectrons between the cathode and anode of a battery. |
Electrolyte |
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Chemical reactions that result in an electrode’srelease of electrons. This reaction occurs simultaneously with areduction reaction at the opposite electrode. |
Oxidation |
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The power level that a battery supports inrelation to its volume. (See also specific power.) |
Power Density |
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The kilowatt rating of an energy storagesystem, describing the amount of power that can flow instantaneously in or out of a battery. |
Power Rating |
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A nonrechargeable battery constructedwith cells whose electrochemical reaction is not reversible. |
Primary Battery |
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Chemical reactions whereby an electrodeaccepts electrons. This reaction occurs at the same time as anoxidation reaction at the opposite electrode. |
Reduction |
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The length of time it takes for a battery totransition from no discharge to full discharge. |
Response Time |
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A rechargeable battery constructed withcells whose electrical chemical reaction is reversible. |
Secondary Battery |
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The amount of energy a battery deliversin relation to its mass |
Specific Energy |
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The amount of power a battery delivers inrelation to its mass. |
Specific Power |
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A potentially destructive positive feedback loop whereby an increase in temperature in a systemgenerates heat, further increasing internal temperatures.Some types of batteries, including Li-ion cells, are susceptibleto thermal runaway under abusive conditions during charging or discharging. Cascading thermal runaway occurs whenthe uncontrolled exothermic reaction in one cell spreads toadjacent cells.• |
Thermal Runaway |
