17,623 new energy vehicles have been recalled!Involved in Great Wall, Chery Automobile or power battery problems | New Energy-Finance News

Original title: 17,623 new energy vehicles were recalled!Involving Great Wall, Chery Automobile or power battery problems

On July 16, due to the risk of power battery thermal runaway,Great Wall Motor, Chery Automobile voluntarily recalled 17,623 new energy vehicles.Funeng TechnologyMany battery suppliers are involved.

China Securities Journal reporter fromNingde eraIt was learned that the recalled vehicle was not equippedNingde erabattery.Great Wall MotorIn response, iQ models are equipped with Funeng batteries.

　　Recall 17,623 new energy vehicles

According to information released by the State Administration of Market Supervision, since July 16, Chery Automobile has recalled some Chery Arrizo 5e electric vehicles produced from July 20, 2018 to May 28, 2019, totaling 1,407 vehicles.Great Wall MotorThe recall of Great Wall Euler IQ electric vehicles produced from July 7, 2018 to October 30, 2019, a total of 16,216 units. The two car companies recalled 17,623 electric vehicles in total.

It is reported that the above-mentioned recalled vehicles may be equipped withNingde erabattery. The relevant person in charge of Ningde Times told a reporter from China Securities News that Ningde Times has extensive cooperation with many car companies, but the recalled vehicles do not carry Ningde Times batteries.Great Wall MotorThe relevant person in charge responded: “iQ uses Funeng batteries.”

　　Funeng TechnologyAccording to the prospectus issued on July 9, 2020, the supporting power battery company of Great Wall Euler iQ (upgraded version) isFuneng Technology, The energy density of the battery pack is 167Wh/kg.

Funeng Technology stated in the prospectus that the company has been cooperating with Great Wall on this model (the Euler iQ model) since 2018. Due to the good market response in 2019, the company’s sales to Great Wall Group have increased rapidly.

　　Or thermal runaway of power battery occurs

According to the news on the official website of the State Administration for Market Regulation,Great Wall MotorIn accordance with the requirements of the “Regulations on the Administration of Recall of Defective Automobile Products” and the “Implementation Measures of the Regulations on the Administration of Recall of Defective Automobile Products,” the company filed a recall plan with the State Administration for Market Regulation. There is a matching difference between the consistency of some of the power batteries carried by the vehicles within the scope of this recall and the BMS software control strategy. After long-term continuous and frequent fast charging, the battery performance will decline, and in extreme cases, thermal runaway of the power battery may occur, which may pose a safety hazard.

For some vehicles within the scope of Chery Automobile’s current recall, there may be consistency fluctuations in the assembly of some parts in the power battery. After the vehicle has been used for a long time, the bottom of the vehicle is subjected to abnormal impact or severe turbulence. In extreme cases, the high-voltage connection of the battery pack system may become loose, and the internal resistance of the local contact may increase. When used with high current, the components may overheat and the cells may be baked. Causes battery thermal runaway, posing safety hazards.

Ouyang Minggao, an academician of the Chinese Academy of Sciences and Tsinghua University, publicly stated that there are three main thermal runaway mechanisms for high specific energy power batteries. The first is the internal short circuit caused by the diaphragm puncture to cause thermal runaway; the second is the positive release of active oxygen in high specific energy batteries, and the oxygen evolution density continues to decrease with the increase of specific energy; the third is the cathode evolution of active lithium, It is caused by fast charging or overcharging.

Ouyang Minggao pointed out that through internal short-circuit detection algorithms and a series of engineering methods, the safety management capabilities of the battery management system can be improved. “Battery insulation is not enough, but there must be a heat dissipation design. There are also some battery heat insulation and heat dissipation must all be done together.” Ouyang Minggao said.

Editor in charge: Zhang Hengxing SF142