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On April 22nd, an ES8 electric car in Xi'an 's authorized service center burned out spontaneously. After investigation and analysis, the official cause of the spontaneous combustion was caused by the short circuit of the battery hit by the car chassis.

The results of the investigation into the accident showed that the ES8 parked at the service network first smoked, and then there was an open fire seven minutes later, until it was burnt out. Fortunately, there was no explosion and no casualties. NIO said, "the chassis of the vehicle suffered a serious impact before it was sent for repair, resulting in a large area of deformation of the left rear shell of the power battery pack and the cooling plate." The internal structure of the battery package formed a short circuit after being squeezed for a period of time, which eventually caused a fire. "because NIO did not detect the chassis, this situation was not found.

Judging from the pictures of the accident, the burning Fulai ES8 was surrounded by fire, leaving only part of the chassis and the rest almost gone. Video of the fire shows that workers have tried to put out the fire with a fire extinguisher, but the fire has not been effectively controlled.

After receiving the alarm, the fire brigade rushed to the scene in time to put out the fire. No explosion occurred in the accident, nor did it cause personal casualties or damage to other facilities.

Because NIO did not upload and publish the specific test report, the related picture analysis of the collision site of the vehicle and the damage to the battery pack, which caused some netizens' doubts. A senior car commentator said: "NIO statement is not strong enough, just a sentence by external forces, or relatively vague, with a map of careful analysis, in order to ease everyone's worries."

At the same time, NIO claimed that the vehicle chassis had suffered a "serious impact" before it was sent for repair, resulting in a large area of deformation of the left rear shell of the power battery pack and the cooling plate. The battery pack is the core component, and the real-time monitoring system is equipped with battery pack system and battery sensor. Since the electric package is seriously deformed and the internal structure is also squeezed, the monitoring system should be able to detect it in time and give a fault prompt.

(ES8 spontaneous combustion process)

NIO official explanation for the Xi'an vehicle accident on April 22:

On April 20, 2019, an ES8 sent Xiuwei to Xi'an cooperative service network to replace the front windshield and repair the front bumper. As the above repair items do not involve the whole vehicle chassis, the car is not on the platform for chassis testing. After the maintenance service was completed on the 21st, the vehicles were parked in the parking lot of the service network.

At about 13:41 on 22 April, smoke began to appear on the vehicles and an open fire appeared on the vehicles at 13:48. The fire brigade rushed to the scene to put out the fire in time after receiving the alarm. There was no explosion in the accident, nor did it cause any personal casualties or other facility losses.

NIO immediately reported the accident to the competent department and organized technical experts to the scene for investigation.

Through investigation and data analysis, the following preliminary conclusions are drawn:

The chassis of the vehicle suffered a serious impact before it was sent for repair, resulting in a large area of deformation of the left rear shell of the power battery pack and the cooling plate. The internal structure of the battery pack forms a short circuit after being squeezed for a period of time, which eventually leads to fire.

NIO has been committed to providing safe and reliable intelligent electric vehicle products. Here also draw the attention of all users, if there is a serious chassis impact while driving, please contact your user consultant or 4009996699 Weiwei to the service hotline, we will check the status of the vehicle to ensure the safety of the car.

In addition, there has been no follow-up to the fire and explosion of Tesla in Shanghai. Tesla's official statement on Weibo stayed on April 24, saying that the incident was being investigated under the leadership of the authoritative department, and Tesla actively cooperated with the investigation and released the results in a timely manner.

From a number of electric vehicle fire cases, the safety of the battery pack has been questioned again. In the event of impact damage, short circuit and other related situations, it may lead to a fire accident, resulting in huge heat in the battery, followed by rapid combustion and deflagration. Under great power, a car can be burned in a short time.

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