As the transition to 46-series (46-phi) cylindrical cell mass production approaches, how much more finely the swelling-pressure behavior specific to the 46 mm-diameter cell must be measured compared to the 21700 has emerged as a practical line-design variable. As Korea's ESS Round-3 centralized-contract market bid size is under review for expansion to over 1 GW and new ESS orders for AI data centers surge, pressure to expand or convert 46-phi lines is expected to grow further. This article presents the proposition that an interface structure in which pressure-sensor data is first aggregated at the BMS gateway layer — rather than at the line PLC — absorbs per-gate judgment delay within…