This paper presents early results from an ongoing field test of HEV batteries on heavy-duty trucks. The presented results focus on the parameters that can affect ageing, such as SOC and power. The goal with this study is to correlate battery ageing to battery usage. Commercial LMO/LTO lithium-ion battery cells were tested onboard four Scania trucks. The test equipment was designed for this type of HEV battery testing on conventional vehicles by emulating an HEV environment. This concept allows unobtrusive and low cost testing of battery cells under realistic conditions. Each truck is equipped with test equipment containing one cycled battery cell and one calendar aged cell. The hybrid strategy used in this test allows battery power and SOC to vary depending on drive pattern within certain limits. Battery capacity and resistance is measured periodically and this makes it possible to receive information about battery ageing without bringing the cells to the lab.
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