Yesterday, the Technical and Quality Department of Junfeng Motors held a battery safety-related meeting to inspect the battery safety management system of Junfeng Motors, conduct a self-examination against the technical standards and quality management system, and find gaps in the target models.
In the recent period, new forces in the industry have caused a large number of battery recalls of a well-known brand to cause huge losses to the company, a huge negative impact on the brand, and cast a shadow over the industry. Relevant personnel of Junfeng Company believed at the meeting that the rapid development of enterprises should not sacrifice quality, batteries and other core parts suppliers. The selection of suppliers should be specific and quality controllable. The quality system is not a decoration written in a book, but an operation that needs to be submerged to the scene. guide. For this reason, over the years, Dongfeng Junfeng has insisted on using first-class batteries such as Lide Times, and each model battery only chooses one brand, avoiding major quality accidents; insisting on quality first, always keeping the brand image above everything else.
In the future, it is necessary to further strengthen the construction of the quality system, so that users can rest assured, drive comfortably, and ride at ease with Junfeng Motors.
News background:
In October of this year, a series of fire incidents occurred in a well-known brand car of a new force aroused concern. A well-known brand automobile of a new force has announced the recall of 1,282 electric vehicles. A well-known brand automobile of a new force said that the battery cell supplier mixed impurities during the production process, which caused the power battery to have a risk of fire. This pointed the finger at the supplier ZTE High Energy.
However, in the four fire incidents that occurred in a well-known brand car of a new force, ZTE High Energy only admitted that two of them were related to itself. It is worth noting that in addition to ZTE High Energy, a new power brand car also has many battery suppliers such as Ningde Times, Tianjin Lishen, Suzhou Yuliang, and Jiangsu Tafel.
Different suppliers, integration into a problem
“Ningde Times is a supplier of many auto companies, and it is difficult to meet the demand in terms of supply. Because of the right to speak, a well-known brand automobile of a new force chose other suppliers to ensure the overall supply. ZTE High Energy is a company that advertises innovation. The company always emphasized the battery quality during the cooperation negotiations at that time." An insider of a well-known brand automobile of a new force told a reporter from China Business News.
The industry believes that the strategy of adopting multiple suppliers will test the company's supply chain management level. There will be no exchange of core technologies between different suppliers. Even if the OEM gives a unified technical standard, each supplier can meet the standard, but there will still be subtle parameter differences between different products, which means that the OEM cannot only use one set Management system to successfully match batteries from different suppliers.
If the main engine factory has too many suppliers and there is no targeted management system to match it, the quality of the product will be difficult to guarantee.
In addition to a new force, a well-known brand car, last year, Weilai Automobile had several spontaneous combustion incidents in Shanghai, Wuhan and other places. In June 2019, Weilai Automobile recalled 4803 ES8 electric vehicles due to battery safety.
Regarding battery safety, Feng Hao, UL's global vice president and president of Greater China, told China Business News that first, there are problems with the battery itself. If there are problems with the materials and design of the battery, accidents will easily occur. Second, in the battery production process, the manufacturing process and quality standards have not been strictly implemented. Third, the battery testing under various working conditions failed to be effectively managed. For example, whether the wiring harness direction affects the safety performance of the battery, whether there are safety hazards after the wiring harness is squeezed during the manufacturing process, etc., these need to be resolved in the testing phase.
"Some power batteries may not have considered enough risk prevention at the beginning of the design, because the battery design is limited by performance, manufacturing process, size and other aspects. Many engineers need to consider the constraints in multiple dimensions when designing. , Make the best balance." said Wang Haobo, UL's automotive business development director.
Safety Core: Advanced Battery Management System
According to the data shared by Xu Hailiang, general manager of Nande New Energy Vehicle Inspection (Jiangsu) Co., Ltd. at the 8th Lithium Davos Forum, there were 127 new energy vehicle explosions and fire accidents (publicly reported) from 2011 to 2019. Involving 38 companies and 48 models. Among them, sales of new energy vehicles have increased rapidly after 2015, and fire accidents have also increased significantly. In these fire accidents, pure electric vehicles accounted for 70%. Judging from the state of the fire, 29% of them were parked, 39% were accidents during driving, 23% were accidents during charging, and some were parked after charging or driving after charging. Accident.
“Of these, 44 were unknown thermal runaways, 17 were fire and explosions caused by collisions, 6 were explosions caused by the loss of control of key components, and some were caused by structural design, production quality control, charging and discharging, etc. "Xu Hailiang said.
Ouyang Minggao, academician of the Chinese Academy of Sciences and executive director of the China Electric Vehicles Association, once publicly stated that battery thermal runaway is the main cause of spontaneous ignition of electric vehicles. The core of ensuring safety is research and development
"The overheating of the battery will cause thermal runaway, and there are many reasons for the overheating of the battery. It may be that the temperature of the battery pack itself is not uniform, overcharge and overdischarge, external short circuit, internal short circuit and other electrical reasons will release heat. There are mechanical reasons, such as water ingress, poor sealing, collisions, etc." Ouyang Minggao believes that product quality problems are the root cause of hidden safety hazards, and new energy vehicles are not strictly followed in the process of design, manufacturing, verification and use. Relevant technical standards and specifications. Some car companies are racing against the decline of the new energy subsidy policy, so there are many potential safety hazards.
However, Xu Hailiang told reporters: “According to the reasons announced by the State Administration of Market Management, the failure caused by pure batteries is only 8%.” Xu Hailiang said that from 2018 to 2020, the total number of new energy vehicle recalls exceeded 200,000. Most accidents are caused by problems with the battery's wiring harness and connectors, or problems with the quality control of key components, or problems with the production quality control of the battery or the entire vehicle, or battery failure. In addition, battery consistency or performance degradation and software issues can also cause some accidents.
"New energy vehicles have risks in terms of software security. This is a problem that should be paid attention to in the future. For example, if someone remotely tampered with some parameters of the bms management system and made some changes to the highest temperature setting, this car is likely to be Will burn. Objectively this risk already exists." Feng Hao told reporters.
The recently released "Energy-saving and New Energy Vehicle Technology Roadmap 2.0" has set safety goals for new energy vehicles for the first time. In terms of the setting of the fire rate, by 2025, 2030, and 2035, the fire accident rate of new energy vehicles will be less than 0.5 times/10,000, 0.1 times/10,000 and 0.01 times/10,000 respectively.
In addition to the explosion, new energy vehicles also have problems with hardware. On November 6, Ideal Automobile announced the recall of 10,500 Ideal ONEs. Vehicles within the recall range due to the design of the front suspension lower arm ball pin release force, when the vehicle is impacted by a collision, the front suspension lower arm ball pin may disengage, which may affect the control of the vehicle, and in extreme cases it will increase the risk of accidents. Risks, there are hidden safety hazards.
"New energy vehicle design also has a lot to do with quality. Many details of new energy vehicle products have not been mastered in the design process." Cui Dongshu, secretary general of the Federation of Travelling Associations, told reporters that the product quality and reputation of new energy vehicles will give the company Great influence, the entire industrial system still needs further improvement. However, as the scale expands in the future, the quality of new energy vehicles will also improve.