Improving battery safety requires attention to manufacturing process

Recently, several spontaneous combustion accidents of electric vehicles have once again caused the safety of new energy vehicles to attract great attention from the industry and outsiders. According to data from the Defective Product Management Center of the State Administration of Market Supervision and Administration, as of the first half of this year, a total of 141 new energy vehicle recalls have been implemented in China, and the number of recalled vehicles is 860,500, many of which are related to power lithium batteries; According to new energy vehicle accident data, power lithium battery failure is an important cause of fire accidents, accounting for up to 77%, of which battery cell thermal runaway accounts for 82% of power lithium battery failure causes. The reasons for the failure of power lithium batteries are complex, including technical problems, design defects, material ratios, etc. Among them, manufacturing process defects during processing are also important factors. Judging from the recall notice announced by Weimar Motors recently, the important thing is that the battery cell supplier mixed impurities during the processing process, which caused abnormal lithium evolution in the power lithium battery. In extreme cases, it may cause the battery cell to short circuit and cause the power lithium battery to lose control. There is a risk of fire. Coincidentally, the BMW Group has recently recalled 26,700 plug-in hybrid vehicles globally. The reason is also due to the impurities mixed in the batteries during the processing. Statistics show that 40% of battery accidents are caused by manufacturing defects. Among them, the common problems in the manufacturing process are due to poor management, lax control, and inadequate measures that lead to impurities such as metal dust being mixed into the battery, causing internal short-circuits and increasing the battery temperature and causing spontaneous combustion. In addition, in recent years, power lithium battery processing companies have been pursuing higher energy density and charging and discharging performance, and upgrading these indicators requires stronger design and manufacturing capabilities, as well as higher standards and requirements in processing technology. However, some companies have cut corners and shoddy materials when the design level, manufacturing process, and overall capacity are not up to date. This will seriously affect the quality of power lithium battery products and cause vehicle safety problems. It can be seen that to improve the safety of power lithium batteries, we must pay attention to the processing and manufacturing process. To improve the processing and manufacturing technology of power lithium battery companies, multiple measures must be taken to improve management and strengthen quality control in all aspects. The first is to improve the infrastructure, improve the rules and regulations, use the system to manage processing and manufacturing, and use a good quality management system to ensure the processing consistency of power lithium battery products and ensure product quality. The processing and manufacturing process of power lithium batteries is, in the final analysis, a question of grasping the technical standards. The company must establish clear quality indicators, yield targets, etc. Only clear objectives can lay the foundation for continuous improvement of product quality. The second is to strictly implement the specifications, including the implementation of relevant standards and index parameters, and to prevent artificial arbitrariness. At the same time, it is necessary to consciously find loopholes in materials, processing techniques, operating procedures and other links, pick up the missing parts, eliminate various factors that are prone to product quality defects, effectively ensure product quality, and minimize safety hazards. In the processing process, we must put an end to irregular behavior. For example, the processing environment is closely related to battery quality. Battery manufacturing must be a dust-free and static-free processing workshop. The processing site must have strict control measures to prevent metal dust from being introduced; various semi-finished products must be stored separately; material transportation tools must use magnets to eliminate metal dust, etc. . If the company does not strictly enforce these regulations, it will lay a safety hazard for product quality. The third is to vigorously carry out technological innovation. Power lithium battery technology is constantly evolving. If you don't strive to innovate, you will not be able to keep up with the pace of industry and market development. In addition to the overall technical innovation of the product, the power lithium battery processing and manufacturing process should also be continuously innovated. For example, some companies have introduced JTM (rolled core to module) technology, which simplifies the process and reduces the cost. The blade battery introduced by BYD is also a typical technological innovation and process innovation. These new technologies, new processes, and new methods, related to ensuring product quality, enhancing quality and brand influence, have greater boosting and supporting uses. At the same time, the company must also improve the level of automated processing and improve the quality of power lithium battery products with automated and intelligent processing methods to ensure battery performance and battery safety. The promotion of electric vehicles must take safety as the bottom line. As the core component of power lithium battery, its safety is the lifeline of new energy vehicles. It is hoped that the company can learn lessons from the spontaneous combustion accident of electric vehicles, strengthen the manufacturing process management of power lithium battery products, provide consumers and society with safer and high-quality products, and eliminate people's safety anxiety about electric vehicles. Only in this way can electric vehicles gain the trust of consumers and truly embark on the road of marketization. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Zhuhai Guanyu intends to raise 3.2 billion yuan to expand battery production