IEEE 1679-2020 pdf download

IEEE 1679-2020 pdf download.IEEE Recommended Practice for the Characterization and Evaluation of Energy Storage Technologies in Stationary Applications
3. Characterization information
3.1 Submittal conventions
3.1.1 General To effectively compare energy storage technologies, a consistent convention is required for data presented by manufacturers. These parameters include, but are not limited to, temperature range, voltage window, discharge rate, etc. All elements required for operation of a complete system within its specifcations—preferably to the point of use (connection to application) to enable a direct comparison—should be specifed and included in submittals (i.e., packaging, electronics, thermal management, etc.).
For the purposes of this document, the term technology refers to the underlying storage medium, such as a lithium-ion battery, or a high-speed fywheel. The term device refers to the energy storage component as designed and offered by a particular manufacturer; and the term system refers to the complete package offered, including auxiliary systems.
Sample data covering typical lead-acid batteries are provided in Annex B.
3.1.2 Energy rating
An energy rating expresses usable energy storage capacity of the device. For energy ratings to be meaningful, all limiting parameters such as rate, temperature, state of charge (SOC), and end-of-discharge voltage should be specifed. Energy ratings should be expressed in watt-hours (Wh). It is also recommended to know the coulombic storage capability for a given discharge rate. This is usually termed capacity and is expressed in ampere-hours (Ah). If the capacity is given in watt-hours, then the nominal voltage should also be specifed to allow calculation of the capacity in ampere-hours.
The nameplate rating of the device in watt-hours or kilowatt-hours should be accompanied by the rate of discharge in watts or kilowatts or the time over which the rated energy can be discharged. Other rating methods may also be provided, such as specifc energy (watt-hours/kilogram [Wh/kg]), energy density (watt-hours/liter [Wh/L]), etc. If these parameters are specifed, the confgurations and conditions under which the rating is valid should be included.
Energy ratings are normally based on products at the beginning of life. The manufacturer should state how available energy from the device may vary over service life (see also 3.2).
3.1.3 Power rating
Power ratings for energy storage devices are specifed in a number of ways. In order to provide a rating that is useful for comparison of technologies, the rating should include all limiting parameters, such as the following:
— The duration of the discharge
— The operating voltage range
— Temperature
NOTE—In addition to power limitations in charge or discharge due to initial operating temperature, operation  ay also be restricted by temperature rise due to Joule heating.
— The SOC for which the power rating is specifed
Power ratings should be specifed in watts (W) over a defned period of time.
Other rating methods may also be provided, such as specifc power (watts/kilogram [W/kg]), power density (watts/liter [W/L]), etc. If these parameters are specifed, the conditions under which the rating is valid (rate, temperature, SOC, discharge time, etc.) should be included, and the ratings should be valid for a complete system. Power ratings are normally based on products at the beginning of life. The manufacturer should state how the available power from the device may vary over time (see also 3.2).
3.1.4 Cycling capability
The ability of an energy storage technology to sustain repeated charge and discharge cycles of varying depth of discharge (DOD) is essential to certain applications. To provide a specifcation of cycling capability (cycle life) that is meaningful for comparison of technologies, the DOD of the cycles and the limiting or end-of- life condition (see 3.2.1) should be specifed. Optimally, the cycling capability should be determined by performing testing that is representative of the use in the end application. IEEE 1679 pdf download.IEEE 1679-2020 pdf download