The cooling system is instrumental in ensuring the optimal operating temperature of the battery pack in electric vehicles (EVs). This study investigates two cooling system configurations (Model I and Model II), both employing liquid cooling channels to to control the temperature of an 84 cells battery module. The thermal effectiveness of the proposed cooling systems is evaluated based on three key parameters: the battery pack maximum temperature (Tmax), the cell-to-cell temperature difference (Tdiff), and the pressure drop through the cooling channels (Δp). The results indicate that the temperature distribution within the battery pack is highly sensitive to the coolant inlet velocity, the discharge rate of the cells, as well as the geometric configuration of cooling channels. Notably, a channel design with a higher-pressure drop may lead to increased pump power consumption, which can adversely impact the overall system efficiency and battery lifespan. A comparative analysis reveals that, at a constant inlet velocity of 0.1 m/s, Model I achieve reductions in Tmax of 0.9 ℃ and 1.92 ℃ at 3C/5C discharge rates, respectively, compared to Model II. However, these thermal improvements come with the drawback of a higher pressure drop. Overall, this study not only evaluates the impact of critical design and operating parameters on cooling performance but also provides strategies for improving thermal management in batteries to elevate efficiency and ensure dependable operation of EV battery packs.