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Each test included a mocked-up initiating ESS unit rack and two target ESS unit racks installed within a standard size 6.06 m (20 ft) International Organization for Standardization (ISO) container. All tests were conducted with an identical LIB configuration.
Each test began by energizing a flexible film heater wrapped around an individual 18650 cell in the initiating mock-up cell. The instrumented 18650 cell was heated at a rate of 6°C/min to initiate thermal runaway. Heating continued at this rate until thermal runaway was observed, at which point the heater was de-energized.
ISO container The simulated ESS was constructed in a standard 6.06 m (20 ft) International Organization for Standardization (ISO) shipping container. The standard exterior dimensions of such a shipping container are 2.43 m (8 ft) wide, 2.59 m (8.5 ft) high, and 6.06 m (20 ft) long.
Various laboratory- and industrial-grade sensors were used to characterize the gas composition throughout container. A National Instruments SCXI-1001 chassis, SCXI-1600 DAQ controller, SCXI-1102 voltage input multiplexer, and a SCXI-TC2095 thermocouple input module were used to collect the data from the listed sensors.