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In this study a 1D electrochemical-thermal model is coupled with a 3D thermal model in order to predict the heat generation and corresponding temperature distribution in a battery cell. The developed model is verified against experimental data for a 20 Ah lithium iron phosphate (LFP) which is operating at 20 °C ambient temperature. The model is then adjusted to accommodate for 10Ah and 40 Ah cells by decreasing and increasing the surface area of each cell as well as the tab dimensions. The temperature distribution of the different cells are studied employing fin cooling as well as indirect liquid cooling system. Simulation results highlight that the temperature gradient within the surface of the 40 Ah cell is almost 1.9 and 1.3 times that of the 10 Ah and 20 Ah cells, respectively. Moreover, it is found that the fin cooling method by employing aluminium plates between the cells is not a good choice when applied to large format batteries. Whereas, by employing the indirect liquid cooling, a very uniform temperature along with low temperature gradient is achieved even under high discharge rate. When the two cooling units have the same volume, the obtained volumetric temperature gradient with fin cooling is equal to 20.5, 27.5 and 34.7 °C for the 10 Ah, 20 Ah and 40Ah respectively, whereas the corresponding value in case of the indirect cooling is 4.7, 5.2 and 6.2 °C respectively