UL 9540A:2018 free download

UL 9540A:2018 free download Test Method for Evaluating Thermal Runaway Fire Propagation in Battery Energy Storage Systems
4.9 THERMAL RUNAWAY – The incident when an electrochemical cell increases its temperature through self-heating in an uncontrollable fashion. The thermal runaway progresses when the cell’s generation of heat is at a higher rate than the heat it can dissipate. This may lead to fire, explosion and gas evolution.
4.10 UNIT – A frame, rack or enclosure that consists of a functional BESS which includes components and subassemblies such a cells, modules, battery management systems, ventilation devices and other ancillary equipment. CONSTRUCTION
5 General
5.1 Cell
5.1.1 The design of the cells associated with the BESS that were tested shall be documented in the test report, including general cell chemistry, 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 weight.
5.1.2 The cell documentation included in the test report shall indicate if the cells associated with the BESS comply with UL 1973.
5.2 Module
5.2.1 The design of the modules associated with an BESS that were tested shall be documented in the test report, including the generic (e.g., metallic or nonmetallic) enclosure material, the general layout of the module contents and the electrical configuration of the cells in the modules and the modules in the BESS.
5.2.2 The module documentation included in the test report shall indicate if the modules associated with the BESS comply with UL 1973.
5.3 Battery energy storage system unit
5.3.1 The BESS unit documentation included in the test report shall include the manufacturer, model and electrical ratings, including energy capacity of BESS units that comply with UL 9540, including certification information.
5.3.2 For BESS units for which UL 9540 compliance cannot be determined, the documentation included in the test report shall include number of modules, electrical configuration of the module, and physical layout of the modules, battery management system (BMS) and other major components of the BESS. The BESS enclosure overall dimensions and generic (e.g., metallic or nonmetallic) material used for the enclosure shall be documented.
5.3.3 The details of any fire detection and suppression systems associated with the BESS shall be noted in the test report.
6 Cell Level
6.1 Sample
6.1.1 Cell samples shall be conditioned, prior to testing, through charge and discharge cycles for a minimum of 2 cycles using a manufacturer specified methodology to verify that the cells are functional. Each cycle shall be defined as a charge to 100% SOC and then to specified end of discharge voltage (EODV). During conditioning a relationship between open circuit voltage and SOC shall be determined through measurement of voltage and SOC. During conditioning the ambient temperature shall be maintained in accordance with the higher of the temperatures derived from Section 6.2.1 or the operating temperature in the cell manufacturer’s specifications.