Extending battery lifetime by avoiding high SOC
Artikel i vetenskaplig tidskrift, 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.

Modelling

Li-ion battery

Measurements

Plugin Hybrid electric vehicle

Electric vehicle

Författare

Evelina Wikner

Chalmers, Elektroteknik, Elkraftteknik

Torbjörn Thiringer

Chalmers, Elektroteknik, Elkraftteknik

Applied Sciences (Switzerland)

20763417 (eISSN)

Vol. 8 10 1825

Åldringsmekanismer och hur man förlänger livet på batterier i fordon och stationära applikationer

Energimyndigheten (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.

Ämneskategorier

Infrastrukturteknik

Annan kemiteknik

Annan fysik

Farkostteknik

DOI

10.3390/app8101825

Mer information

Senast uppdaterat

2024-01-03