Extending battery lifetime by avoiding high SOC
Journal article, 2018

The impact of ageing when using various State of Charge (SOC) levels for an electrified vehicle is investigated in this article. An extensive test series is conducted on Li-ion cells, based on graphite and NMC/LMO electrode materials. Lifetime cycling tests are conducted during a period of three years in various 10% SOC intervals, during which the degradation as function of number of cycles is established. An empirical battery model is designed from the degradation trajectories of the test result. An electric vehicle model is used to derive the load profiles for the ageing model. The result showed that, when only considering ageing from different types of driving in small Depth of Discharges (DODs), using a reduced charge level of 50% SOC increased the lifetime expectancy of the vehicle battery by 44-130%. When accounting for the calendar ageing as well, this proved to be a large part of the total ageing. By keeping the battery at 15% SOC during parking and limiting the time at high SOC, the contribution from the calendar ageing could be substantially reduced.


Li-ion battery


Plugin Hybrid electric vehicle

Electric vehicle


Evelina Wikner

Chalmers, Electrical Engineering, Electric Power Engineering

Torbjörn Thiringer

Chalmers, Electrical Engineering, Electric Power Engineering

Applied Sciences (Switzerland)

20763417 (eISSN)

Vol. 8 10 1825

Ageing mechanisms and how to prolong the battery life in vehicle and energy storage applications

Swedish Energy Agency (37725-1), 2014-04-01 -- 2017-06-30.

Ageing mechanisms & how to prolong battery life in vehicle and energy storage applications’

Volvo Cars (4150395483), 2016-11-09 -- 2016-11-30.

Subject Categories

Infrastructure Engineering

Other Chemical Engineering

Other Physics Topics

Vehicle Engineering



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