What is BS EN IEC 62576- Electric double-layer capacitors in hybrid electric vehicles about?  
BS EN IEC 62576 is an international standard that discusses electric double-layer capacitors for use in hybrid electric vehicles.
BS EN IEC 62576 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.
BS EN IEC 62576 can also be applicable to the capacitor used in idling reduction systems (start and-stop systems) for the vehicles.
BS EN IEC 62576 can also be applicable to the capacitor modules consisting of more than one cell.
Note: Annex E provides information on the endurance cycling test.
Who is BS EN IEC 62576 - Electric double-layer capacitors in hybrid electric vehicles for? 
 BS EN IEC 62576 on electric double-layer capacitors is relevant to: 
- Electric double-layer capacitor manufacturers
- Hybrid electric vehicle manufacturers
- Automotive industry
- Design engineers
- Electrical engineers
Why should you use BS EN IEC 62576- Electric double-layer capacitor in hybrid electric vehicles?
The electric double-layer capacitor (capacitor) is used as an energy storage system for vehicles. Capacitor-installed electric vehicles are commercialized with an eye to improving fuel economy by recovering regenerative energy, and by peak power assistance during acceleration, etc. 
With these points in mind, BS EN IEC 62576 aims to provide basic and minimum specifications in terms of the methods for testing electrical characteristics and to create an environment that supports the expanding market of electric vehicles and large-capacity capacitors.
BS EN IEC 62576 lays out guidance on electric double-layer capacitors, and test methods, that determine capacitance, internal resistance, and maximum power density of capacitors. Moreover, guidance on the endurance test is also covered in BS EN IEC 62576.
Compliance with the test methods and requirements recommended in BS EN IEC 62576, can help avoid product failures, thus ensuring your capacitors meet the quality and performance needs of the hybrid electric vehicles.
What’s changed since the last update?
BS EN IEC 62576:2018 supersedes BS EN 62576:2010, which is withdrawn. BS EN IEC 62576:2018 includes some technical changes with respect to BS EN 62576:2010. These include: 
- Information on the applicability of this document has been added in Clause 1
- The definitions of some terms in Clause 3 have been improved
- The description of test procedures in Clause 4 has been clarified
- Information on endurance cycling test has been added (Annex E)
