Every reporter Sun Lei, every editor Pei Jianru
Guangzhou Automobile Aian Aion S is "on fire" again.
A few days ago, a video circulating on social media showed that a Guangzhou Automobile Aion S was smoking and caught fire and exploded during the rescue of firefighters. Judging from the color and flowers of the vehicle and the clothes of the firemen, this Aion S is a taxi in Guangzhou.
In response to this matter, the reporter of national business daily made a verification to GAC’s Ai ‘an, but as of press time, GAC’s Ai ‘an has not yet replied.
"The spontaneous combustion of electric vehicles is related to many factors. It is impossible to judge the specific reasons for the spontaneous combustion of vehicles only through individual cases." Wang Zidong, deputy secretary general of China Automotive Power Battery Industry Innovation Alliance, told the reporter.
Contemporary Amperex Technology Co., Limited: I didn’t match the Guangzhou taxi.
Judging from the above-mentioned live video, the fire situation of this Aion S is similar to many previous spontaneous combustion incidents of electric vehicles. For example, the vehicle was not charged at that time, and smoke appeared at the tail, followed by fire and explosion.
It is worth mentioning that some netizens believe that the Aion S may be equipped with Contemporary Amperex Technology Co., Limited NCM811 ternary lithium battery.
In this regard, the relevant person in charge of Contemporary Amperex Technology Co., Limited said in an interview: "Contemporary Amperex Technology Co., Limited has not made a package for the Guangzhou taxi, and the taxi model does not use the battery (battery) of Contemporary Amperex Technology Co., Limited."
Image source: vision china
The relevant person in charge of Guangzhou Automobile Ai ‘an told the reporter that the Aion S currently used by taxis in Guangzhou is a dazzling version. The reporter learned that there are currently five models of Aion S in the market, namely, 2019 Hyun 530, Hyun 630 and 2020 Hyun 580, Hyun 580 Travel Standard Edition and Hyun 630. Among them, the 2019 Hyun 530 uses the NCM523 battery provided by AVIC Lithium Battery, and the 2019 Hyun 630 uses the NCM811 battery provided by Contemporary Amperex Technology Co., Limited.
"Battery is one of the most important factors causing spontaneous combustion. For example, the sudden large current pulse of the charging pile induces the boundary use of the battery, but the battery product is not fully restrained, which leads to spontaneous combustion. This is very common now and belongs to an unknown application problem in new fields, which needs specific communication and definition. " He Wei, vice president of Huizhou Yiwei Lithium Energy Co., Ltd., said in an interview.
An industry insider told reporters: "Although the battery (battery) is the core component of new energy vehicles, there are various reasons for the spontaneous combustion of electric vehicles, which cannot be entirely attributed to the battery (battery)."
The fire vehicles are all dazzling versions.
In fact, this is not the first time that Aion’s has caught fire. According to the public reports, the reporter found that in less than one year from May 2020, six Aion S had fire accidents.
On May 18, 2020, an Aion S of Ruqi travel platform in the parking lot on the east side of the south gate of Guangzhou Carambola Park suddenly spontaneously ignited; At the beginning of July of the same year, an Aion S spontaneous combustion event occurred in Huizhou, Guangdong; In mid-August of the same year, at an intersection of Pingshan Avenue in Shenzhen, an Aion S suddenly caught fire and spontaneously ignited while waiting for the traffic lights; In late August of the same year, an Aion S caught fire at the intersection of Yebo Road and Yeheyi Street in Haikou City, Hainan Province. In December 2020, an Aion S in Taiyuan, Shanxi Province caught fire without charging, and then "exploded".
Watchmaking: Every reporter Sun Lei
For the fire accidents that occurred many times, GAC Ai ‘an only responded to the first accident, saying that the vehicle was indeed spontaneous combustion, and the reason was under investigation, but the investigation results have not been announced since then.
According to the data of the Federation, from listing in April 2019 to January 2021, the cumulative sales volume of Aion S was about 84,000 units. From this calculation, the probability of spontaneous combustion of Aion S is approximately 0.71/10,000 vehicles.
It is worth noting that of the above six spontaneous combustion accidents, five occurred in the southern region and three occurred in summer. At the same time, the reporter’s investigation found that these six Aion S with spontaneous combustion are all dazzling versions.
The electric network car needs targeted modification.
The relevant person in charge of Guangzhou Automobile Ai ‘an and the sales staff of 4S shop all told the reporter that the Aion S dazzle version model is mainly for the online car market, while the Aion S charm version model is mainly for individual consumers.
"In principle, the longer the vehicle is used or the higher the frequency of use, the greater the chance of spontaneous combustion. But it mainly depends on what brand of car it is and what the specific reasons are. " He Wei told reporters, "Most of the problems at present are mainly primary quality control problems. Now the industry is in a period of rapid expansion and various resources are being integrated, which should be a phased problem."
In Wang Zidong’s view, the probability of spontaneous combustion of electric vehicles is not strongly related to the frequency and time of use. The integration of vehicle power batteries, the driver’s usage habits and charging habits may all trigger the spontaneous combustion of electric vehicles. "Operating vehicles will be in a full-load state and will encounter various conditions, and these conditions are likely to be insufficiently designed and verified during the battery integration process." Wang Zidong said.
The above-mentioned insiders said that the power battery system, as a system with a very close combination of hardware body and control system, can be roughly divided into battery Pack test and battery management system (BMS) test. Among them, the battery Pack test includes acupuncture test, salt water immersion, external fire, vibration test, etc. Battery Management System (BMS) testing is more focused on software testing, which is generally carried out in the process of software function development. But even if all the tests are passed, there is no guarantee that the power battery will be completely free from problems.
Wang Zidong believes that bad habits such as charging the vehicle immediately after parking and charging the vehicle with fast charging piles for a long time may be the causes of spontaneous combustion of electric vehicles.
It is understood that when an electric vehicle uses a non-compliant charging pile, the charging pile may output a large current that the lithium battery can’t bear. Inside the battery, the charging speed is too fast, which will cause lithium ions to form dendrites like branches on the surface of the negative electrode. These dendrites are as thin and hard as a needle tip. When the dendrites grow to a certain length, they will puncture the diaphragm and induce internal short circuit, which will lead to spontaneous combustion.
Image source: photo network
"Some car companies are forced by sales pressure to put the models sold to the C-end into the B-end market. However, due to the long-term high-load operation characteristics of operating vehicles, car companies need to modify these vehicles in a targeted manner to reduce the probability of accidents. " Wang Zidong told reporters.
Cover Image Source: vision china
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