This paper covers BMS verification for 800‑V electric vehicles and high‑voltage energy storage using cell emulation. It introduces key test scenarios including measurement accuracy, fault detection, balancing, SOC/SOE estimation and ripple response, and outlines the ITECH hardware test platform. Relevant international automotive and EU battery standards are referenced. It stresses combining simulator bench tests with real‑battery testing to deliver repeatable and traceable BMS validation results.