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Open AccessArticle

Aging Effect of Temperature Gradients in Li-ion Cells Experimental and Simulative Investigations and the Consequences on Thermal Battery Management

1
BMW Peugeot Citroën Electrification GmbH, Taunusstraße 45, 80807 München, Germany
2
Department of Vehicle Mechatronics, TU Dresden, Georg-Bähr-Straße 1c, 01069 Dresden, Germany
*
Author to whom correspondence should be addressed.
World Electr. Veh. J. 2012, 5(2), 322-333; https://doi.org/10.3390/wevj5020322
Published: 29 June 2012
The occurrence and simulative reconstruction of local aging inhomogeneities in Li-ion cells caused by temperature gradients are described, which typically result from active battery cooling in automotive applications. The interactions of thermal, electrical and degradation behaviour are investigated on a prismatic Li-ion cell of 60Ah capacity comprising a graphite / NCM/LMO-blend system. Therefore a transient 3D thermal FVM model combined with a 3D impedance based FNM-model is implemented in order to consider thermal-electrical inhomogeneities. The model is validated by thermal measurements on operated Li-ion cells that are prepared with 8 internal thermocouples inside the jelly roll of the battery. For degradation investigations a weighted charge throughput cycle life model is discretized analogue to the thermal-electrical model. Temperature, current rate and SoC swing are each considered by an aging stress pre-factor. The aging model is exemplary parameterized by five isothermal cycle-life tests. The simulative results show the inhomogeneous capacity loss and impedance rise inside the battery cells with thermal gradient for two aging scenarios. As a result, also temperature and current density distributions inside the cell changes over lifetime. According to both aging indicators, a Li-ion battery cell with temperature gradient comprises an aging relevant temperature that equates the volumetric averaged jelly roll temperature plus 10% of the maximum temperature difference in the jelly roll.
Keywords: batteries; modelling; thermal management; Li-ion batteries; cycle life batteries; modelling; thermal management; Li-ion batteries; cycle life
MDPI and ACS Style

Fleckenstein, M.; Bohlen, O.; Bäker, B. Aging Effect of Temperature Gradients in Li-ion Cells Experimental and Simulative Investigations and the Consequences on Thermal Battery Management. World Electr. Veh. J. 2012, 5, 322-333.

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