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Modular design of battery pack for electric vehichle (EV) is an important things to consider. Because in modular battery pack, cost to manufacture can be reduced also easiness in handling. Modular battery pack also meant to be easily swapped between every modules. In this paper were presented the thermal analysis of modular battery pack that generate heat during charging and discharging process. heat flux generated by the batteries will affect its surrounding thus increase the temperature of the batteries. Thermal analysis simulation were conducted to ensure the heat generated not exceed the maximal operational temperature of the battery cells that can reduce the battery life. The simulation is done by analyzing the heat power generated by the cells, the effect on surrounding, and heat generated by the current flow in the circuit. Simulation result were showing that the temperature rise in the battery pack not exceed 60°C, in the surrounding or even in the battery cell. It is found that these two parameter, lower cost to manufacture, and thermal stability having the largest effect on reliability. Hopefully futher studies of thermal management on battery pack conducted to generate reliable design of modular battery packs