Intelligent chassis systems for battery electric vehicles (BEVs) face unresolved challenges in structural-mechanical integration, multi-domain control coordination, and fault-tolerant safety architecture under battery-induced mass redistribution and X-by-wire decoupling requirements. This review employs a four-layer framework—Foundation (X-by-wire), Execution (suspension/lightweight structures), Control (domain strategies), and Evolution (autonomous-ready architectures)—to synthesize recent adva