Pre-conference Workshop

Do Current Standards and Test Methods for Lead-Acid Batteries
Properly Reflect Micro-Hybrid Automotive Duty?

Messe Wien Exhibition & Congress Centre, Vienna, Austria

Tuesday, 4 September 2018, 14.00 – 17.00

Chair: Geoffrey May, FOCUS Consulting

Panel: Eckhard Karden, Ford; Torsten Hildebrandt, Cenelec; Joern Albers, Johnson Controls

Facilitator: David Rand, CSIRO

The workshop will focus on the development of realistic methods of assessing the technical performance of automotive lead-acid batteries in micro-hybrid duty. It follows the intensive discussions that took place in Alcala de Henares in Spain in May 2018 on High Temperature Durability Tests for Advanced Lead-Acid 12 V Batteries (EFB & Heat) and in Kloster Eberbach in Germany in 2017 and will provide a brief up-date on the key issues as well as an opportunity for discussion.

Dynamic charge acceptance (DCA) of lead-acid batteries can be improved by the use of additives in the negative electrode and other features. This allows 12 V micro-hybrid batteries to be an essential component in vehicle systems to reduce CO2 emissions and fuel consumption. They are also more robust when operated in a partial state-of-charge and in moderate climates but most high DCA additives lead to reduced high temperature durability as measured by standard tests. In addition, the automotive industry needs longer battery lifetimes in hot climates. The test protocols that are used at present do not adequately represent the conditions of use of batteries in actual service although they may provide a basis for comparing different technologies, designs and battery suppliers.

These issues need to be resolved urgently to maintain and improve the position of lead-acid batteries. At present start and stop or micro-hybrid technology is used for most cars in Europe and is becoming more important elsewhere. Enhanced Flooded Batteries (EFB) are used for smaller high volume cars and Absorptive Glass Mat (AGM) types for larger vehicles with more complex electrical systems. Li-ion batteries offer high dynamic charge acceptance and are improving in terms of low temperature performance but have limitations for operating temperature and a significant cost premium. Mild-hybrids in particular as well as full-hybrids and battery electric vehicles will become more widely used in the future. These will all use Li-ion batteries although an auxiliary lead-acid battery will be retained for safety and security functions.

Standardisation and technical development for auxiliary lead-acid batteries is needed to retain their competitive position and also work on battery state-of-health monitoring to improve reliability. Li-ion batteries are always plug-and-play.

The format and objectives of the workshop will be outlined by Geoffrey May and then Torsten Hildebrandt will provide an overview of international standards for automotive and micro-hybrid batteries. Eckhard Karden and Torsten Hildebrandt will then introduce the key issues for DCA and micro-hybrid testing (MHT) followed by a discussion on this subject. The workshop will then move on to high temperature testing, also introduced by Eckhard Karden and Torsten Hildebrandt. The final part will be introduced by Eckhard Karden and Joern Albers to provide views from an OEM and from the perspective of a battery supplier for a closing discussion on priorities and next steps from the floor.


  • 14.00 Introduction, Geoffrey May
  • 14.10 Automotive Battery Standards Development: A Summary of the Current Position, Torsten Hildebrandt
  • 14.20 Questions
  • 14.25 Dynamic Charge Acceptance and Micro-Hybrid Testing, Eckhard Karden and Torsten Hildebrandt
  • 14.45 Discussion
  • 14.55 High Temperature Durability, Eckhard Karden and Torsten Hildebrandt
  • 15.15 Discussion
  • 15.40 Coffee
  • 15.55 Future Challenges: OEM View, Eckhard Karden
  • 16.05 Future Challenges: Battery Supplier View, Joern Albers
  • 16.15 Discussion – To focus on industry priorities and to identify the next steps
  • 17.00 Close of meeting
eGAS Demonstration
Immediately after the workshop, participants will be offered a demonstration of an electronic gas analysis system (eGAS) that allows on-line in-situ measurement and analysis of gas flows emitted by lead-acid batteries. This eGAS system is being developed under contract to the Advanced Lead–Acid Battery Consortium (ALABC) by the testing system supplier measX, who will demonstrate the prototype system in Vienna for the first time. The system is designed for flexible standalone operation in a laboratory or a vehicle and will record gas flow rates (up to 100 ml/min), concentrations of hydrogen, oxygen, and carbon-dioxide, along with battery voltage and temperature as well as ambient pressure and temperature. It is recommended for all investigations of side reactions in EFB and EFB+C, for example Tafel characterization, water consumption under laboratory or driving conditions, oxygen cycle in flooded systems, as well as additive selection for high DCA.

Seminar delegates will receive copies of all presentation materials after the event, together with a summary of the key issues raised in discussion.

The Workshop will be limited in numbers and places will be allocated to the first 70 applicants.


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