UL 9540A-2017 pdf download – Test Method for Evaluating Thermal Runaway Fire Propagation in Battery Energy Storage Systems.
5 General 5.1 Cell 5.1.1 The general cell design shall be documented in the test report, which would include the cell chemistry (cathode, anode and electrolyte materials), the physical format of the cell (i.e. prismatic, cylindrical, pouch), cell electrical rating in capacity and nominal voltage, the overall dimensions of the cell, and its weight. 5.1.2 It shall be documented whether or not the cell complies with UL 1973. 5.2 Module 5.2.1 The overall design of the module shall be documented including the overall dimensions, and the generic enclosure material. The electrical configuration of the cells and the general layout of the module contents shall be documented. 5.2.2 It shall be documented whether or not the module complies with UL 1973. 5.3 Battery energy storage system unit 5.3.1 The overall layout of the BESS including number of modules and electrical configuration of the modules should be documented. The physical layout of the modules, the BMS and other major balance of plant components shall be documented. If the system has an integral fire detection and suppression system, the details of this system shall be noted in the report. 5.3.2 The BESS enclosure overall dimensions and generic material used for the enclosure shall be documented. 5.3.3 The report shall indicate whether or not the BESS complies with UL 9540. PERFORMANCE 6 Cell Level 6.1 Sample 6.1.1 Cells shall be conditioned, prior to testing, through charge and discharge cycles for a minimum of 3 cycles using manufacturer specified methodology. During this process, a relationship between the open circuit voltage and state of charge shall be quantified by measurement. The ambient temperature for this conditioning cycling is to be per 6.2.1, unless the cell needs to be at an elevated ambient in order to be active. If the cell requires an elevated ambient to be active, the conditioning shall be conducted at a temperature necessary per the manufacturer’s specifications.