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Plotting the Aging Path of Batteries

Dr. Frieder Herb, longstanding ExtraEnergy associate and member, concluded his doctoral studies on the aging of batteries and fuel cells at the university of Ulm in 2010. Thanks to his research it is now possible to predict the lifespan of pedelec and e-bike batteries.
 

 
Dr. Herb invested several years in a systematic analysis of how batteries and fuel cells age. Among others, he studied the aging process and the types of problems which arise as batteries get older.

By simulating aging, Herb was able to speed up his investigation of what happened in real-world applications. From his investigations he was able to construct and verify aging models for lithium-ion batteries and Polymer electrolyte membrane (PEM) fuel cells.

"One problem that occurs with aging is, for instance, that the electrode surface mutate. High temperatures alter the material quicker and close up the pores, which, in turn, leads to increased resistances," said Herb.

Both models were integrated in a vehicle simulation and the impact of the value changes occurring in a battery and fuel cell monitored as they age. By reducing the dynamic of the fuel cell the aging process of the cell could be slowed. The lowest aging activity was measured in a big battery and a big fuel cell.

In the simulation Herb used so-called Raff tests to put batteries under additional stress, by exposing them to high temperatures and higher charge-turnarounds. The excessive stress levels were then calculated back to levels experienced in actual, real-world applications. In combination with the statistics collected on the measured test rides conducted by ExtraEnergy, a trip in the city could, for instance, be simulated over many years.

The outcome of the simulation: a prediction for the speed at which a battery of a pedelec ages when used in the city, without having to expose it to a long-term test.

With the Herb research as foundation, ExtraEnergy should now be able to integrate the aging of pedelec batteries and e-bikes in its tests.

Click here to download the entire thesis (in German only).

Copy: Dr. Frieder Herb
Translated by: Christoffel Volschenk
Photo: Susanne Brüsch

17 February 2011

 
 

Events:

18 - 21 March 2015
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27 - 29 March 2015
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China North International Cycle Show
LEV Components Special Exhibition

6 - 9 May2015
Shanghai, China
China Cycle Show
LEV Components Special Exhibition

6 - 7 June 2015
Tanna, Germany
Open day
LEV Components Special Exhibition including lectures and Test IT Track

10 July 2015
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e:bikefestival Kitzbühler Alpen
Conference

10 - 12 July 2015
Kitzbüheler Alpen, Austria
e:bikefestival Kitzbühler Alpen
LEV Components Special Exhibition
Test IT Show

26 - 29 August 2015
Friedrichshafen, Germany
EUROBIKE
LEV Components Special Exhibition including lectures
Pedelec Award Ceremony

17 - 27 September 2015
Frankfurt, Germany
International Motor Show (IAA)
LEV Components Special Exhibition including lectures
Test IT Show

20 - 23 October 2015
Taichung, Taiwan
Taichung Bike Week
LEV Components Special Exhibition

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