Crashed Electric Vehicle Handling and Recommendations—State of the Art in Germany
Abstract
:1. Introduction
2. Technical and Human Aspects Related to Safety
2.1. Safety Requirements for Electric or Hybrid Electric Vehicles
- Reduction of the high voltage on electric interfaces to: UDC < 60 V; UAC < 30 V within 5 s;
- Reduction of electrical energy on high voltage bus bars: Etotal < 2 J after 5 s;
- Insulation resistance high voltage-conductors and chassis-mass: >100 Ω/V (DC); >500 Ω/V (AC) after 5 s;
- Ingress protection (IP) class: protection of all live parts from contact by finger (IPXXB).
2.2. Risk Analysis for Rescue Services
3. General Procedures for Traffic Accidents with EVs
3.1. Incoming Emergency Call in Control Center
3.2. Rescue Service Arrival at Accident Site
3.2.1. Identification of the Vehicle
3.2.2. Accident Categories and Recommendations for Action
- (1)
- Optical analysis: The visual impression of the vehicle will be the first indicator for firefighters, as they arrive at the scene. After the vehicle is successfully identified as an EV, optical inspection of the traction system is required. The rescue team needs to pay specific attention to the deformation of the battery case, leakage of liquids like electrolyte or coolant, rupture, and smoke generation [63]. A typical indicator for a reactive battery storage is the changing smoke color from black to white. Burning graphite is usually characterized by grey smoke. White smoke can be an indicator for an ongoing fire of electrolyte inside the cells [29,64];
- (2)
- Acoustic analysis: Due to the pressure build up inside the cell housing, caused by heat generation or mechanical deformation, the gas will be released at designated vent openings if the pressure exceeds a certain limit. The audible consequences are hissing and crackling for pouch and prismatic cells, as well as deflagration for cylindrical cells [65];
- (3)
- Gas analysis: The first impression of a ruptured traction system would be a sweet solvent-like odor, typical for leaking electrolyte [65]. In addition, portable gas detection systems can be used to obtain information about the released gases;
- (4)
- Thermal analysis: The temperature of a lithium ion cell is a good indicator for its state in regard of safety [24,66]. Two opportunities to measure the temperature would be directly attached thermocouples or an infrared (IR) camera. The use of an IR camera is problematic: the purchase costs are not to be underestimated, there is little space below the underbody of the vehicle where the energy storage is typically installed. The metal surfaces of the case reflect other light sources and so falsify the result. Another difficulty that also affects the thermocouple method is the delay and temperature drop of the reading, due to thermal resistance between the measurement points and the actual temperature inside the cell. A possible suggestion would be a combination of both methods. For measurement of the temperature with an IR camera from a distance, attention must be paid to a proper camera setup and to focusing on a non-reflecting surface of the battery. This can be supported by a direct temperature measurement with thermocouples attached to the battery in close proximity to the cells. Both readings should be checked against each other for plausibility.
3.3. Towing from the Accident Site
- Electric (or hybrid) powertrain;
- Firefighting measures that took place;
- State of the high voltage system;
- Potential danger from damaged high voltage components;
- Battery in contact with water;
- Risk of electric shock;
- Possibility of a delayed re-ignition of the traction battery [20].
3.4. Recycling
4. Discussion of Current State and Recommendations
4.1. Information Transfer About the Powertrain
4.1.1. Assessment of the Battery State
4.1.2. Extinguishing Methods
4.1.3. Quarantine Area
5. Summary
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
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Tasks | Work Field | Regulation | Qualification | Processes | Recovered Materials |
---|---|---|---|---|---|
Removal of the battery from the vehicle | Recycling companies | DGUV 8686 [8] | Level 2 Non-electrical work [8] | Deactivation, check for no voltage, removal | - |
Disassembly of the residual vehicle | Certified dismantling facilities [89] | EU End-of-Life Vehicles Directive (Directive 2000/53/EC) [90] and EU Waste Directive (Directive 2008/ 98/EC) [91] | Respective training | Two-step-process: liquid removal + dismantling of components containing pollutants and shredding of the body [89] | Steel, copper, light and precious metals, glass, tires and plastics, oils, brake fluids [89] |
Disassembly of the battery systems to cell or module level | Recycling companies | DGUV 8686 [8] | Level 3 Working under high voltage circumstances [8] | Module disassembly; partly robotic aided battery disassembly [85,86] | Copper bus bars, cabling, printed circuit boards (PCB), plastics [32,83] |
Feeding the cell parts to process | Battery recycling | EU directive 2006/66/EC on battery waste [88] | Respective training | Pyro metallurgical | Nickel, cobalt, copper [32,83] |
Pyro metallurgical and Hydrometallurgical [87] | Nickel, cobalt, lithium [87] |
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Wöhrl, K.; Geisbauer, C.; Nebl, C.; Lott, S.; Schweiger, H.-G. Crashed Electric Vehicle Handling and Recommendations—State of the Art in Germany. Energies 2021, 14, 1040. https://doi.org/10.3390/en14041040
Wöhrl K, Geisbauer C, Nebl C, Lott S, Schweiger H-G. Crashed Electric Vehicle Handling and Recommendations—State of the Art in Germany. Energies. 2021; 14(4):1040. https://doi.org/10.3390/en14041040
Chicago/Turabian StyleWöhrl, Katharina, Christian Geisbauer, Christoph Nebl, Susanne Lott, and Hans-Georg Schweiger. 2021. "Crashed Electric Vehicle Handling and Recommendations—State of the Art in Germany" Energies 14, no. 4: 1040. https://doi.org/10.3390/en14041040
APA StyleWöhrl, K., Geisbauer, C., Nebl, C., Lott, S., & Schweiger, H. -G. (2021). Crashed Electric Vehicle Handling and Recommendations—State of the Art in Germany. Energies, 14(4), 1040. https://doi.org/10.3390/en14041040