The recent popularity of electric vehicles (EVs) has led to significant advancements in developing Li-ion batteries, especially due to their high energy densities, long life, and low self-discharge rates. These batteries have an optimal operating temperature range, usually between 293 K and 313 K, and a maximum temperature difference of 5 K. A sluggish performance can be seen at lower temperatures, whereas a battery life degradation can be seen at a higher temperature, which could lead to a thermal runaway. High-temperature differences lead to a significant reduction in battery life. This necessitates the need for effective thermal management. Phase-change materials (PCMs) have been extensively used in developing battery thermal management systems (BTMS), as they are a passive thermal management solution and have been observed to give a very low-temperature difference in the battery pack. However, they become ineffective after the PCM has attained a liquid fraction of one. Coolant flow-based BTMS (cold plates) is also a popular cooling solution. As they depend on forced convection with the liquid at a constant inlet temperature, they can be used for long durations with the pack held at a constant temperature. However, they draw additional power from the battery to pump the coolant. They have also been observed to lead to a temperature gradient along the flow direction. This work focuses on developing a hybrid cooling solution, trying to benefit from the advantages of the PCM and coolant-based methods while limiting their drawbacks. This work analyses the performance of a hybrid cold plate with honeycomb-inspired grooves on one side and branched coolant flow channels on the other. This allows for a slower melting of the PCM and a higher combined heat transfer coefficient, allowing for a lower and more homogenous pack temperature. The cooling effect from the PCM allows for a lower coolant velocity compared to a case with only convection-based cooling, reducing the pumping power required for the system. As one cold plate combines both the channels and the grooves, the effective heat transfer per unit weight is increased while reducing the overall weight of the BTMS. This work also incorporates pressure pads for the pouch cells with the cold plates, thus providing an integrated packaging solution for the battery pack. The performance of the BTMS has been analyzed at various discharge rates and compared to the thermal performance in the existing literature. Finally, this work discusses an effective and scalable manufacturing process for these plates.