On July 10, the "First China International Electric Vehicle Safety Technology Innovation Conference" with the theme of "Breaking through and Transforming the Safety of Electric Vehicle Development" was held in Baoding, Hebei.

　　At the meeting, Liu Yanlong, Secretary General of China Chemical and Physical Power Source Industry Association, Yu Qingjiao, Secretary General of Zhongguancun New Battery Technology Innovation Alliance, Mo Ke, founder of True Lithium Research, Tang Haifeng, Vice President of Great Wall Motors and Chairman of Honeycomb Group, Yang Hongxin, General Manager of Honeycomb Energy, Deputy General Manager Rao Zhongru and others jointly released the "White Paper on the Development of China's Automotive Grade Power High-speed Laminated Batteries". This is the world's first laminated battery application white paper, which comprehensively sorts out the development history and technical characteristics of power batteries, points out a safe way for future development of automotive-grade power batteries, and helps promote a new round of power battery process technology innovation.

　　The world's first lamination process white paper was released in Baoding, refreshing automotive grade power battery standards

　　The world’s first laminated battery application white paper is released

　　The development of power lithium batteries in my country started in the 21st century. The 50 lithium-ion battery buses used in the 2008 Beijing Olympics set a precedent for the industrialization of lithium-ion batteries.

　　After more than ten years of rapid development, power lithium batteries have now reached a crossroads. On the one hand, new energy vehicles have a huge demand for power lithium batteries; on the other hand, power lithium batteries are facing a series of challenges such as subsidy reduction, "white list" cancellation, frequent safety accidents, etc. The power battery industry chain urgently needs to form a more comprehensive Close cooperation.

　　In order to further implement the innovation-driven development strategy and accelerate the high-quality development of the lithium battery industry, relevant institutions of industry, academia and research in the power battery industry jointly launched the world's first white paper on the application of laminated batteries - "White Paper on the Development of China's Automotive Grade Power High-speed laminated batteries".

　　The world's first lamination process white paper was released in Baoding, refreshing automotive grade power battery standards

　　This white paper comprehensively summarizes the current development status of global lithium battery production technology, from the development of lithium-ion battery production equipment, the process differences and quality control of winding and lamination, the development path of technology and equipment in the lamination era, the performance advantages and performance advantages of batteries in the lamination era. Several sections such as safety improvement introduce the latest progress and future trends of high-speed lamination process.

　　In the current industrial context, the release of this white paper, on the one hand, through a longitudinal review of the evolution of lithium battery technology, points out to the industry that the stacking era is the only way forward for power battery process innovation; on the other hand, through a horizontal comparison of the lamination process and winding The differences in processes put forward the safety, endurance, life, size, capacity, price and other conditions that car-grade batteries need to meet, thus providing clear standard guidance for manufacturing process innovation for all parties in the battery industry chain.

　　What did we read in the lamination process white paper?

　　In recent years, energy storage white papers, power battery white papers, etc. have been released in the power battery industry. What is different about this high-speed lamination process white paper? What step has the technological progress of the lamination process taken now?

　　In this "White Paper on the Development of China's Automotive Grade Power High-speed Laminated Batteries", we can see the following differences.

　　1. Division of three stages of lithium-ion battery development

　　The white paper spends a lot of space to comprehensively sort out the lithium battery from the 1.0 era of 3C-level applications, to the 2.0 era of ordinary power applications, and now to the 3.0 era of automotive-level power applications, and the corresponding battery cells at each stage. morphological changes and the manufacturing processes of mainstream manufacturers.

　　The world's first lamination process white paper was released in Baoding, refreshing automotive grade power battery standards

　　The first two stages are mainly based on the winding process. In the battery 3.0 era, the design of new energy vehicle battery packs is developing in the direction of longer length, and the height direction is unified at around 100mm. Therefore, batteries produced by the lamination process will be widely used.

　　2. Process differences and quality control of winding and lamination

　　The biggest process difference between square laminated batteries and coiled batteries lies in the three major processes of slitting, die-cutting and pole assembly forming. The processing methods of other processes are the same. The biggest difference lies in the pole assembly forming method.

　　First of all, the positive and negative electrode sheets in the winding process are continuous, and the positive and negative electrode sheets in the lamination process are in the form of sheets; secondly, in the winding process, when the mark hole on the pole piece is detected, it is cut at the mark hole position to complete a pole set. The laminated battery cells are laminated according to the set number of positive and negative electrode sheets. When the number reaches the set value, the lamination of one battery cell is completed; finally, there are differences in the shape of the formed electrode groups. The pole group of the winding process, with the same number of layers, has twice the number of tabs than the laminated battery. In terms of quality control, the requirements for burr and dust control of laminated batteries are higher.

　　3. Development and performance advantages of technology and equipment in the stacking era

　　The white paper introduces the current three directions of lamination equipment: ① high-speed lamination equipment route; ② cutting and stacking integrated machine; ③ thermal lamination high-speed lamination equipment. The first type of technology has high flexibility and feasibility and is in the development stage; the second type is not yet mature for application due to the difference in efficiency matching between the die-cutting machine and the lamination machine; the third type is due to the patented thermal composite lamination process. Protection limits the promotion and application within the industry.

　　The world's first lamination process white paper was released in Baoding, refreshing automotive grade power battery standards

　　Honeycomb Energy adopts the square aluminum shell lamination process, chooses the industry-leading high-speed lamination route for equipment technology, and hires domestic and foreign senior lamination equipment and process experts to achieve technological achievements in the field of high-speed lamination. Stack-era batteries not only have higher energy density and more stable internal structure, but also have higher safety and longer cycle life.

　　For safety, refresh the car-grade power battery standards

　　According to incomplete statistics, since April 2019, at least 6 new energy vehicle fires have occurred. Although the causes of fires vary, some are charging, some are being repaired, and some spontaneously ignite while standing still... The series of accidents has not only caused people to worry about the safety of electric vehicles, but also caused harm to the development of the industry. adverse effects.

　　In this regard, Wan Gang, Vice Chairman of the National Committee of the Chinese People's Political Consultative Conference and Chairman of the China Association for Science and Technology, pointed out: "Faced with the superposition of various new safety issues, it is necessary to formulate new technical standards and safety standards, especially to establish system-wide solutions. At the same time, further improve Product quality, improve consistency and reliability in the design, manufacturing, assembly and other aspects of power batteries.”

　　The release of the "White Paper on the Development of China's Automotive Grade Power High-speed Laminated Batteries" provides solutions on how to build safe and reliable automotive grade power batteries, and proposes power lithium battery standards that ensure safety from the selection of technical paths. From the joint release of this white paper, we saw a joint appeal from industry, academia and research parties.

　　The conference brought together Xu Yanhua, deputy secretary-general of the China Automobile Association, Fu Bingfeng, executive vice president and secretary-general of the China Automobile Association, Billy Xu, representative of SAE International, Yang Yusheng, an academician of the Chinese Academy of Sciences, Liu Yanlong, secretary-general of the China Chemical and Physical Power Supply Industry Association, China Dynamics Deputy Secretary-General of the Battery Innovation Alliance & Deputy Secretary-General of the China Electric Vehicle Charging Infrastructure Charging Alliance Wang Zidong, founder of True Lithium Research Mo Ke, Director of the State Key Laboratory of Safety and Energy Conservation at Tsinghua University Professor Lu Languang, China New Energy Materials Technology Research Institute Professor Chang Wang Qingsheng and many other industry experts have worked together to improve the safety and quality of global electric vehicles.

　　As the core component of electric vehicles, power batteries are not only related to the competitiveness of OEM electric vehicle products, but also closely related to consumers' driving safety. In this regard, Yang Yusheng, an academician of the Chinese Academy of Engineering, emphasized at the meeting: "We must use mature and safe batteries to develop safe, energy-saving and emission-reducing electric vehicles."

　　Regarding the next generation of automotive-grade power batteries, Lu Languang, director of the State Key Laboratory of Safety and Energy Conservation at Tsinghua University, said bluntly: "The advantages of the winding process are high production efficiency and controllable inter-layer clamping force. However, due to the curvature radius, especially the winding core The internal center curvature radius is small, resulting in small N/P, uneven charging and discharging stress, inconsistent deformation, and easy lithium precipitation. The lamination process is just the opposite. Each part is evenly stressed and not easy to deform. Lamination is more suitable for deformation. Larger electrode materials help ensure consistent deformation during charge and discharge cycles and avoid problems such as lithium precipitation."

　　Power battery safety is not just talk. The world's first lamination process application white paper was released at the first China International Electric Vehicle Safety Technology Innovation Conference, marking the first step for Chinese companies to take the first step in the safety of power lithium battery system solutions. Let the world realize the safety and reliability of high-speed stacking, enhance trust in square stacked batteries, and then promote the industry to stride forward in a more stable "stacking era".

　　The world's first lamination process white paper was released in Baoding, refreshing automotive grade power battery standards

　　It is understood that new and old forces in the lithium battery industry such as CATL, Panasonic, Samsung SDI, Funeng Technology, Wanxiang A123, and Micromacro Power have plans to introduce the lamination process after 2022. Honeycomb Energy, a new force in power batteries, took the lead in releasing its first car-grade square stacked battery on April 10 this year, entering the "stack era" three years ahead of the world's mainstream manufacturers.

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