Overview - IEC 62576:2018 (Electric double‑layer capacitors for HEVs)
IEC 62576:2018 specifies standardized test methods for electrical characteristics of electric double‑layer capacitor (EDLC) cells intended for peak power assistance in hybrid electric vehicles (HEVs). This is Edition 2.0 (2018), a technical revision of the 2009 edition that clarifies applicability, refines definitions, improves test procedure descriptions, and adds endurance cycling test guidance (Annex E). All tests in the document are defined as type tests for capacitor cells.
Key technical topics and requirements
The standard provides measurement circuits, test procedures and calculation methods for key electrical parameters used in HEV applications:
- Capacitance, internal resistance (ESR) and maximum power density - test circuits, measurement steps and calculation methods.
- Voltage maintenance characteristics - procedures to measure voltage retention under defined load/conditions.
- Energy efficiency (charging/discharging efficiency) - measurement circuits, procedures and calculation of energy efficiency.
- Endurance tests and thermal considerations - informative annexes covering continuous high‑temperature voltage endurance (Annex A), heat equilibrium timing (Annex B), charging/discharging measurement guidance (Annex C), current‑setting procedures (Annex D) and endurance cycling test (Annex E).
- Test equipment and preconditioning - requirements and guidance for reproducible measurements.
- Calculation formulas and criteria for reporting results (e.g., voltage‑time curves, power density calculations) are provided to ensure consistent comparability.
Practical applications
IEC 62576:2018 is designed to support reliable evaluation and specification of EDLC cells used where high‑power bursts and rapid energy recovery are required:
- Validation of EDLC cell performance for peak power assistance during acceleration and regenerative braking in HEVs.
- Type testing by component manufacturers to verify product data (capacitance, ESR, power density, efficiency).
- Supplier‑OEM contractual testing protocols to ensure component suitability for vehicle systems.
- Test laboratories implementing standardized procedures for repeatable, comparable results across products and vendors.
Who should use this standard
- Automotive OEMs and powertrain engineers specifying energy storage components.
- EDLC (supercapacitor) manufacturers and suppliers.
- Independent test and certification laboratories.
- System integrators and researchers developing HEV energy recovery and hybridization strategies.
Related standards
- IEC 62391 series (general EDLC standards) - IEC 62576 complements existing capacitor standards by focusing on HEV‑specific usage patterns and test methods.
Using IEC 62576:2018 helps harmonize EDLC electrical testing for automotive applications, improving comparability, supply‑chain clarity and reliability of high‑power energy storage components in hybrid vehicles.