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Effect of a flexible battery module bracing on cell aging

: Ebert, Fabian; Sextl, Gerhard; Lienkamp, Markus


Institute of Electrical and Electronics Engineers -IEEE-:
Twelfth International Conference on Ecological Vehicles and Renewable Energies, EVER 2017 : Monte-Carlo, Monaco 11-13 April 2017
Piscataway, NJ: IEEE, 2017
ISBN: 978-1-5386-1692-5 (electronic)
ISBN: 978-1-5386-1691-8 (USB)
ISBN: 978-1-5386-1693-2 (print)
International Conference on Ecological Vehicles and Renewable Energies (EVER) <12, 2017, Monte Carlo>
Conference Paper
Fraunhofer ISC ()
Batterie; Lithium-Ionen-Batterien

Lithium-ion battery cells consist either of a stacked or a wound configuration of a separator between two coated electrodes. The expansion of the graphite anode due to lithium intercalation, when charging, leads to a macroscopic expansion of the cell. State of the art rigid battery module bracing causes a periodic pressure build-up over a full charge/discharge cycle and therefore a compression of the battery separator. Furthermore, this results in a reduced diffusivity of the lithium-ions, which can cause lithium plating. Lithium plating is considered as the main cause of (premature) battery aging. In our paper, we present for the first time the investigation of a flexible spring-loaded cell bracing on cell aging by maintaining a nearly constant pressure. In comparison with the rigid bracing, a different aging speed can be observed in favour of the flexible bracing method.