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2.1.4.4 Hazard Event 4:Temperature Control System Failure <br />Table 6 –Failure of the Enclosure B160 Temperature Control System Barriers <br />Barrier Barrier Description <br />THREAT BARRIERS <br />Battery Management Systems <br />(BMS) <br />BMS provides supervisory actions and isolation / <br />protective actions in case of attempted operation <br />including charge and discharge of the battery,outside <br />its intended temperature range.An alarm will be <br />raised at NOC from the BMS via the C6610 if the <br />battery is outside its intended temperature range as <br />tested in UL1973 and battery cells will be isolated <br />from operation. <br />Cell Electrical Abuse Tolerance Cell tested and certified to UL 1973.Cells and <br />modules were tested to UL 9540A and did not <br />propagate fire outside the initiating module. <br />CONSEQUENCE BARRIERS <br />Cascading Thermal Runaway <br />Limitation <br />Cell and module designs prevent cascading thermal <br />runaway beyond the initiating module as <br />demonstrated in UL 9540A testing. <br />Fire Detection A smoke detector is included in the B160 cabinet.In <br />the event of a fire within the battery or other <br />electronics the detector will send an alarm signal to a <br />remote 24/7 Network Operations Center (NOC), <br />alerting the system owner of a potential fire within <br />the enclosure. <br />Deflagration Protection UL 9540A testing has demonstrated that generation <br />of a combustible mixture of vented gasses is not <br />likely in accordance with NFPA68/69.The B160 <br />enclosure contains a panel of pressure relief valves <br />and fans to release vented gas pressure in the event <br />of venting of a cell or cells. <br />Emergency Response Plan <br />Training <br />In many cases,an Emergency Response Plan will be <br />in place to provide direction to building personnel or <br />responders on how to safely evacuate a site in the <br />event of a thermal runaway event.To be added by <br />customer. <br />Confidentiality Class External Confidentiality Label Document Type Page <br />Ericsson Internal Analysis 21 (27) <br />Prepared By (Subject Responsible)Approved By (Document Responsible)Checked <br />ERATLEN Thomas Lennholm <br />Document Number Revision Date Reference <br />1785-BFM 107 220/1 Uen PA2 2025-06-03