Abstract
To improve the thermal and flow performance of the battery thermal management system (BTMS), a heat exchanger with a bionic flow channel structure was designed and applied to a cylindrical lithium-ion battery module in this work. To accurately reflect the transient thermal behavior of the battery, a battery thermal model was obtained by experimentally collecting thermodynamic parameters. A computational fluid dynamics model of the BTMS was established. The influences of different bionic flow channel structure parameters on the thermal performance of the BTMS were investigated by a multi-factor optimization analysis. In addition, the thermal performance was also compared with that of a heat exchanger with a bionic honeycomb-like structure and a traditional helical structure. The results show that at the optimum structural parameters, the maximum temperature, maximum temperature difference, and pressure drop of the BTMS were calculated as 302.656 K, 3.726 K and 29.69 Pa respectively. For the same volume fraction and geometrical parameters, the heat exchangers with a spider web-like structure has better thermal and flow characteristics than honeycomb-like and traditional helical structures.
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