On May 10th, local time, on a highway in Ticino, southern Switzerland, a German driver drove the Tesla Model S into the central isolation belt, then the vehicle turned over and quickly caught fire. The driver was unfortunately trapped in the car. Burned inside. This is the accident that caused a fire after the second Tesla accident in a week, which has caused the death of three people.
▲ Picture from autoblog
Swiss Fire The department announced through Facebook that the cause of the fire may have been a "thermal runaway" in the vehicle's lithium battery after a violent collision. In the same week last week, Tesla also had a fatal car accident in Florida. A fast-moving Model S crashed into the wall and quickly caught fire. There were three teenagers in the car. One of the people in the back was thrown out of the car and the other two were killed in the fire.
▲ Two teenagers were killed in a fire< A witness said: "At the time they were still moving, but I couldn't save them because the fire was too much."
Why did Tesla hit it? The super battery known for its high energy density may have to be backed up. The higher the energy density of the battery, the greater the amount of electricity stored per unit volume and the longer the vehicle's cruising range. The Silla Model 3's three-cell lithium battery, with a battery power density of 300Wh/kg, is unique worldwide.
▲ Tesla Battery after a Fire
However, the three-element lithium battery is very insecure in terms of security. In a car accident, external impact can damage the battery separator and cause a short circuit, and the heat emitted during a short circuit can cause the battery to run out of heat and quickly raise the temperature to above 300°C.
The thermal stability of Sanyuan Lithium battery is poor. If it persists at less than 300°C, it will decompose the oxygen molecules. After encountering the flammable electrolyte and carbon materials in the battery, the heat will be further aggravated. positiveExtremely decomposed, it will detonate in a very short time. In contrast, another widely used lithium iron phosphate battery can adhere to 700-800 °C, and will not break down oxygen molecules, and the security is much higher.
It is based on security considerations that in China, carrying three yuan Lithium-ion battery passenger cars could not enter the list of recommended models of the Ministry of Industry and Information Technology new energy vehicles.
The battery management system is not doing well. The lithium battery is a mobile bomb. In addition to the Samsung note phone, which was infamous for the explosion of the battery, the Boeing 787 also suffered. As the world's first civilian aircraft using lithium batteries, the Boeing 787 fired two lithium battery accidents in January 2013 and was grounded. It scared Airbus to directly abandon plans to use lithium batteries on the A350.
In 2017, pure electric cars sold in China accounted for 44.01% of the installed capacity of ternary lithium batteries, and lithium iron phosphate batteries still accounted for the bulk. However, due to the pursuit of battery energy density, more and more power battery companies have begun to shift to three yuan lithium battery, and even BYD has been sticking to the lithium iron phosphate camp also began to invade.
However, Tesla, known for its excellence in battery management systems, is temporarily unable to get out of the shadows of vehicles. Given the current status of domestic new energy depots, the popularity of three-cell lithium batteries is too fast to be achieved. It is a good thing.Favourite complaint
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