BS EN IEC 62576:2018 pdf free download

BS EN IEC 62576:2018 pdf free 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 ositive 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 conditions