Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Modeling and validation of a threedimensional thermoelectric model of a 50 Ah lithiumironphosphate battery cell at three different ambient temperatures in the New European Driving Cycle (NEDC)
 Wahl, M. ; VDE/VDIGesellschaft Mikroelektronik, Mikro und Feinwerktechnik GMM: AmE 2016, Automotive meets Electronics. CDROM : Beiträge der 7. GMMFachtagung, 1.  2. März 2016 in Dortmund Berlin: VDEVerlag, 2016 (GMMFachbericht 85) ISBN: 9783800741670 ISBN: 3800741679 pp.7479 
 Fachtagung "Automotive meets Electronics" (AmE) <7, 2016, Dortmund> 

 English 
 Conference Paper 
 Fraunhofer UMSICHT Oberhausen () 
 battery system; capacitance; charging device; lithiumion battery 
Abstract
In this work a threedimensional thermoelectric model of a 50 Ah lithiumironphosphate battery cell (LFP cell) is created in SimulationX. The Rintmodel is used in order to describe the electrical behavior of the LFP cell. The electrical parameters such as capacitance C, the open circuit voltage Uoc, the charging resistor Rch, and the discharge resistor Rdisch are identified measurements from a battery test bench at different ambient temperatures (0 °C, 25 °C, 40 °C), currents (25 A, 50 A, 100 A) and at different state of charge (1/ 0.8 / 0.6 / 0.4 / 0.1 / 0). The thermal modeling of the LFP cell takes into account the heat absorption and release by the heat conduction, convection, thermal radiation and an internal heat source. The thermal parameters such as the specific thermal conductivity λ, the specific heat capacity cp, and the emission coefficient ɛ is determined by theoretical methods known in the literature. To generate the electric power of the battery a low engine power electric car with a 75 kW electric motor and a total mass of 903 kg is created in Advisor (Matlab/Simulink) and the NEDC is simulated. The characteristics of the power is exported to SimulationX and equally divided on a battery with 96 LFP cells. After that the threedimensional thermoelectric model of a LFP cell (in a battery test system) is validated in a laboratory at temperatures of 11.35 °C, 26 °C and 32.85 °C and a depth of discharge of 0.