BEV cells are a core part of the new generation of powertrain for electric vehicles, and several projects have studied thermal issues in BEV cells. However, their application in realistic driving cycles with the principle thermo electrochemical model has not been published so far. In this paper, as well as introducing the model, the cell is examined in two different possible realistic driving cycles. The results show the BEV cell temperature in the urban cycle is a function of ambient temperature and there is no need to have an active thermal management system other than to ensure the cell is in optimal ambient working temperature. The main thermal concern in the urban driving cycle is to maintain the cells in an optimum working temperature envelope. As the BEV cell needs to draw less than a 2C discharge rate in urban cycles the cell can dissipate the heat by natural heat convection. However, the cell faces rising temperature when drawing more than 3C discharge rate during high speed driving or acceleration. An active cooling system will be needed in this case to reduce the temperature in the high temperature zone of the cell. Careful design of the cooling system to cool these high temperature zones of a cell could lead to a reduced cooling system capacity and therefore cost. In addition, the results highlight the role of a maximum power limit on cell temperature which can be minimized to reduce the need for thermal management. Further, analysis is needed to determine the optimum number of cells to minimize the cost, weight, size and thermal management cost of the battery pack. The paper describes the thermal model implemented on a vehicle subjected to the NEDC cycle. Future work will examine the cell and model for more realistic driving cycle, such as ARTEMIS2 with a typical electric car as the case study.
The estimation of electric vehicle battery cell temperatures in driving cycles based on NEDC
2013
14 Seiten, 12 Bilder, 2 Tabellen, 17 Quellen
Conference paper
English
Kühlsystem , Kühlmitteleinrichtung , Stadtzyklus , Umgebungstemperatur , Entladung , Verarbeitungstemperatur , Wärmekonvektion , Beschleunigung , Antriebsstrang , elektrische Batterie , Veranstaltungs-Management , hohe Geschwindigkeit , Fahrzyklus , Wärmemanagement , Elektroauto , Kraftfahrzeugbatterie
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