EV battery module structural potting

EV module structural potting is application of a liquid PU system that completely fills the space around cells within the module, forming after cure a solid mass embedding cells in polymeric matrix. Multiple objective: mechanically fix cells, transfer heat between cells and heat sinks, electrically insulate, absorb vibration and impact, and integrate flame retardance.

Technology evolved rapidly with cell-to-pack architecture adopted by BYD (Blade Battery), CATL (Qilin) and increasingly European/American. In this architecture, cells are mounted directly in the pack with PU potting playing structural and thermal roles. Modern formulations are fast-curing two-component systems, applied by automated dispensing in line, with minute-scale cure.