This paper presents a thermal interface for cylindrical cells using busbar-integrated cooling\nchannels. This interface is available due to the use of a stand-alone refrigerant circuit for the thermal\nmanagement of the battery. A stand-alone refrigerant circuit offers performance and efficiency\nincreases compared to state-of-the-art battery thermal management systems. This can be achieved\nby increasing the evaporation temperature to the requirements of the Li-ion cells and the use of\nalternative refrigerants. The solution proposed in this paper is defined for electric two-wheelers,\nas the thermal management of these vehicles is currently insufficient for fast charging where high\nheat losses occur. Three channel patterns for the integrated busbar cooling were examined regarding\ntheir thermal performance to cool the li-ion cells of a 16p14s battery pack during fast charging. A\nmethod of coupling correlation-based heat transfer and pressure drop with thermal finite element\nmethod (FEM) simulations was developed. The symmetric channel pattern offers a good compromise\nbetween battery temperatures and homogeneity, as well as the best volumetric and gravimetric energy\ndensities on system level. Average cell temperatures of 22 DegreeC with a maximum temperature spread of\n8 K were achieved.
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