Optimizing lithium-ion battery (LIB) packs for electric vehicles requires balancing the need to increase volumetric energy density with the necessity of effective thermal management to ensure performance and safety. Recently, the prismatic cell form-factor has enabled the cell-to-pack approach which increases the battery pack energy density. Additionally, dielectric fluid immersion cooling (DFIC) has emerged as a promising battery thermal management (BTM) technology. This article investigates the effectiveness of DFIC's in managing the thermal performance of modules composed of prismatic lithium-ion cells. Specifically, the influence of intercell spacing on cells' temperature, pressure drop across a module, and the volumetric energy density of the module was investigated. The electrochemical-thermal performance of cells at different mass flow rates of the coolant, coolant types, rates of discharge, and the resting …