Discussion on hazard assessment scheme for thermal runaway of electric vehicle
With the increase in the number of electric vehicles,fire accidents caused by thermal runaway of power batteries have occurred from time to time.Evaluating the risk of thermal run-away is one of the important means to improve the safety perfor-mance of electric vehicles,but there is no quantitative evaluation method in the industry.In response to the above issues,an elec-tric vehicle combustion test platform has been established,and a large number of thermal runaway induced electric vehicle fire simulation tests have been conducted.The following reference in-dicators and some potential indicators that can be used for evaluat-ing the harmfulness of electric vehicle thermal runaway have been extracted:the time interval from the start of the test to the thermal runaway of the power battery can be used as an effective indicator for battery failure warning;The time interval from thermal run-away to vehicle fire and the temperature inside the vehicle can be used as safety indicators for passenger evacuation;The time when the volume fraction of smoke exceeds the standard and its relation-ship with the time of ignition can be used as a hazard indicator for toxic gases in the cab;The volume fraction of combustible gases inside the vehicle and the intensity of thermal radiation outside the vehicle can be used as indicators to evaluate the risk of explosion and ignition of adjacent vehicles.By proposing the above evalua-tion indicators,reference can be provided for the subsequent for-mation of quantitative evaluation methods and related standards.
electric vehiclethermal runawayhazardassessment scheme
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