IEC 62576:2018 pdf download

IEC 62576:2018 pdf download.Electric double-layer capacitors for use in hybrid electric vehicles – Test methods for electrical characteristics
1 Scope
This document describes the methods for testing electrical characteristics of electric double-layer capacitor cells (hereinafter referred to as “capacitor”) used for peak power assistance in hybrid electric vehicles. All the tests in this document are type tests. This document can also be applicable to the capacitor used in idling reduction systems (start and-stop systems) for the vehicles. This document can also be applicable to the capacitor modules consisting of more than one cell. NOTE Annex E provides information on endurance cycling test.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 ambient temperature temperature of the air, in the immediate vicinity of a capacitor 3.2 applied voltage voltage (V) applied between the terminals of a capacitor 3.3 calculation end voltage voltage (V) at a selected end point for calculating the characteristics including capacitance under a state of voltage decrease during discharge 3.4 calculation start voltage voltage (V) at a selected start point for calculating the characteristics including capacitance under a state of voltage decrease during discharge 3.5 capacitance ability of a capacitor to store electrical charge (F) 3.6 charge accumulated electrical energy amount of charged energy (J) accumulated from the beginning to the end of charging 3.7 charge current I c current (A) required to charge a capacitor 3.8 charging efficiency efficiency under specified charging conditions, and ratio (%) of stored energy to charge accumulated electrical energy Note 1 to entry: This value is calculated from the internal resistance of a capacitor. Note 2 to entry: Refer to Formula C.8. 3.9 constant voltage charging charging during which the voltage is maintained at a constant value regardless of charge current or temperature 3.1 0 discharge accumulated electrical energy amount of discharged energy (J) accumulated from the beginning to the end of discharging 3.1 1 discharge current I d current (A) required to discharge a capacitor 3.1 2 discharging efficiency efficiency under specified discharging conditions, and ratio (%) of discharge accumulated electrical energy to stored energy Note 1 to entry: This value is calculated from the internal resistance of a capacitor. Note 2 to entry: Refer to Formula C.1 0. 3.1 3 electric double-layer capacitor capacitor device that stores electrical energy using a double layer in an electrochemical cell, and whose positive and negative electrodes are of the same material Note 1 to entry: The electrolytic capacitor is not included in capacitor of this document. 3.1 4 energy efficiency E f ratio (%) of discharge accumulated electrical energy to charge accumulated electrical energy under specified charging and discharging conditions3.1 5 internal resistance combined resistance (Ω) of constituent material specific resistance and inside connection resistance of a capacitor 3.1 6 maximum power density P dm greatest electrical power output of a capacitor per mass (W/kg) or volume (W/l) 3.1 7 nominal internal resistance R N nominal value of the internal resistance (R N ) to be used in design and measurement condition setting (Ω), generally at the ambient temperature 3.1 8 post-treatment discharging and storage of a capacitor under specified ambient conditions (temperature, humidity, and pressure) after tests Note 1 to entry: Generally, post-treatment implies that a capacitor is discharged and stored until its inner temperature attains thermal equilibrium with the surrounding temperature before its electrical characteristics are measured. 3.1 9 pre-conditioning charging and discharging and storage of a capacitor under specified ambient conditions (temperature, humidity, and pressure) before testing. Note 1 to entry: Generally, pre-conditioning implies that a capacitor is discharged and stored until its inner temperature attains thermal equilibrium with the surrounding temperature, before its electrical characteristics are measured. 3.20 rated voltage U R maximum DC voltage (V) that may be applied continuously for a certain time under the upper category temperature to a capacitor so that a capacitor can exhibit specified demand characteristics Note 1 to entry: This voltage is the setting voltage in capacitor design. Note 2 to entry: The endurance test using the rated voltage is described in Annex A.