Li-Ion Battery Pack Immersion Exploratory Investigation

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Li-Ion Battery Pack Immersion Exploratory Investigation ( li-ion-battery-pack-immersion-exploratory-investigation )

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Figure 3. Fisker Karma – evidence of actual individual cell damage 1.2.2 Additional Examples and Discussion of Vehicle Flooding-Related Incidents While it bears repeating that vehicle immersion is a rare and infrequently occurring issue, these incidents do still occur and offer insights into the real-world problems and possible severity these types of incidents may create. Another incident with a plug-in hybrid electric vehicle (PHEV) in Canada highlights some of the issues and characteristics of a delayed incident related to flooding. While more information on the incident can be found in Jiang (2019), the incident began when a driver used his PHEV to tow a boat out of the water on a boat ramp when the vehicle rolled back down the ramp and into the water. Shortly after being towed from the water, the vehicle burst into flames with the locations of the flames indicating a likely issue with the vehicle’s traction battery. Additionally, the PHEV was still attached to the tow truck when flames started shooting from underneath, an increased risk to not only the driver but also first responders. Images from the event are shown in Figure 4. An analysis of battery incidents from China (“Statistics and Analysis on fire accidents for EVs,” 2018) also highlights some additional information relative to battery thermal incidents likely initiated, at least in part, due to flooding. While one could argue that these statistics may not be representative of all regions globally, they certainly provide insights into the frequency and impacts of flooding as the initiation point for a battery thermal event. Specifically, the analysis looked at battery thermal event spanning from February 2011 to June 2018 and found that 4.6 percent of noted battery thermal events were related to flooding. While certainly not the largest percentage, this number still represents an appreciable number of vehicles in a future with widespread electrified vehicle operation. This supports the argument that vehicle immersion should be an area for research and understanding, although not necessarily attached to a specific test or regulatory standard. This analysis also highlights some specific findings related to thermal incidents, one of which is relevant for the discussion and exploratory work contained in this work. Analysis of a July 2016 thermal event related to two electric buses found that there was a thermal event following the flood water receding – again highlighting the importance of assessing the thermal response of a vehicle post-immersion as well as during the actual immersion. 5

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