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2.1.4.2 Hazard Event 2:Failure of a Battery Management System <br />The loss,failure,or abnormal operation of a BMS may directly impact the proper function of <br />the system.To isolate any failure stemming from a failure of the BMS,passive and active <br />electrical fault protections are provided as described below. <br />Table 4 –Failure of the Enclosure B160 BMS Barriers <br />equipment are generally in populated areas,timely <br />response and site access by fire services are anticipated. <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 component failure. <br />System Shutdown /Disconnect Passive and active electrical protections include Circuit <br />Breakers on E6160 (module overcurrent protection via <br />fuses on the DC loads included.) <br />Passive Circuit Protection and <br />Design <br />Fused disconnects in E6160 and DC disconnect <br />switches in B160,in addition to ground fault <br />detection /interruption and over voltage protection <br />are provided as tested in UL/IEC62368. <br />Cell Electrical Abuse Tolerance Cells are 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 />Over Current Protection - <br />Electrical <br />The battery charging system includes over current <br />protection in the form of BMS Control/MOSFET/Circuit <br />Breaker,which limits the charging current to the <br />battery.The battery discharge current is limited by <br />BMS Control/MOSFET/Circuit Breaker,which limits the <br />current drain and load current in the event of a short- <br />circuit or overload of the battery as tested in UL 1973. <br />In this manner,the battery is maintained in its normal <br />operating range. <br />Over Current Protection – <br />Mechanical <br />The likelihood of short-circuits on the output of the <br />battery are reduced through mechanical design and <br />construction using wire routing away from sharp and <br />moving parts.Grommets and abrasion protection are <br />used to protect cable insulation where cables pass <br />between chassis and enclosures as noted in the product <br />listing. <br />Confidentiality Class External Confidentiality Label Document Type Page <br />Ericsson Internal Analysis 17 (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