On September 17, Xie Qiu, general manager of AVIC's lithium battery passenger car business, delivered a keynote speech on the development of power battery technology under the new pattern at the 2021 World New Energy Vehicle Conference (WNEVC). Xie Qiu introduced to colleagues in the industry the thinking on the development of AVIC Lithium battery technology under the new industrial pattern, and at the same time introduced the company's next-generation technology planning and prospects, and released the new design technology products of AVIC Lithium for the TWh era. —One-Stop Bettery.

New energy vehicle development and environment

Thanks Autumn first analyzed the development environment of the new energy industry: the current market development has exceeded expectations. The penetration rate of new energy vehicles in January-August exceeded 10%, and the penetration rate in a single month in August even reached 17%, which is basically close to the country in 2025. 20% penetration rate planning. According to current development trends, sales of new energy vehicles are expected to exceed 2.5 million in 2021, and it is expected to challenge 8 million in 2025, far exceeding the current national plan.

The rapid development of the new energy industry has a huge impact on the environment and resource load, and it poses a very big challenge to the power battery industry. General Secretary Xi Jinping proposed the "dual carbon" goal not only for environmental considerations, but also for economic considerations-reducing carbon means reducing costs for the industrial chain. To achieve the carbon peak in 2030, it is now necessary to start to establish relevant data models, and to establish a plan for scientific quantitative management of the entire industry chain and the entire life cycle in the manufacturing, transportation, use and recycling of power batteries. Therefore, AVIC Lithium Battery puts forward the Life Cycle Assessment (LCA) concept of the whole life cycle, combined with the Design for Environment (DFE) model, through the evaluation of the product’s potential load on the environment and resources from production, transportation, use to recycling, and adopts life cycle thinking and Analyze the environmental data in LCA, optimize the design through quantitative data models, and make preparations in advance for the relevant links of research and development.

Life cycle green ecological technology

Xie Qiu Elaborate the life cycle green ecological technology from four aspects. One is high energy density: From the perspective of energy density, the consumption of resources and emission reduction can be reduced from three aspects. The most intuitive thing is to reduce the weight of the vehicle, reduce the energy consumption of the vehicle, and improve the efficiency of battery production. The company continues to make new breakthroughs in liquid battery technology, moving towards 350-400 Wh/kg energy density; combined with key technological research, the next-generation lithium-sulfur battery soft pack battery energy density will reach 450Wh/kg, or even more than 500Wh/kg. The second is high-efficiency manufacturing technology: From two aspects of material innovation and battery scale manufacturing, manufacturing efficiency is greatly improved, and energy consumption is effectively reduced. The third is long-life technology: research and development of long-life graphite composite anode technology to reduce consumption. At the same time, in-situ lithium replenishment technology is being developed for the anode and electrolyte additives are optimized to achieve the best dynamic charging strategy throughout the life cycle. The fourth is low internal resistance technology: the development of positive and negative materials with high reaction kinetics, the use of high-kinetic fast charging solution and pore filling low-liquid retention technology, to achieve a multi-form optimal combined charging strategy.

Facing technical ideas in the TWh era

Finally, Xie Qiu introduced the company's technical ideas for the TWh era. The 2-3GWh single production line in the TWh era can no longer meet the demand for large-scale manufacturing, and a single production line should reach more than 10GWh. Facing the upcoming TWh era, starting from the underlying product functions, starting from the basic technical principles, refactoring product design, and refactoring the manufacturing process, we proposed the design concept of One-Stop. This concept is based on the product design and manufacture of "highly integrated and extremely simplified", and realizes the product's requirements for "high specific energy, high safety, high reliability, and low cost". Under the exploration and application practice of this concept, on the one hand, the new product design and manufacturing process has broken through the physical bottleneck caused by many existing serial processes and structural composition, and greatly improved the integration efficiency and manufacturing efficiency; at the same time, the product itself The structure is simpler, the number of parts is more streamlined, and the manufacturing process integration is higher. Therefore, the reliability of the product and the manufacturing efficiency are further greatly improved. This technical concept is not only applicable to battery cell products, but also applicable to PACK products. The battery using this technology is the fourth packaged product after cylindrical, soft bag and square.

One-Stop has developed many original technologies, including ultra-thin shell wall, multi-dimensional shell molding, multi-functional composite packaging, integrated bridge electrical connection, high shear Cutting-out insulation, in-situ dust-free assembly integration and other technologies have reduced the weight of the structure by 40%, the number of parts by 25%, and the production efficiency has increased by 100%.

Products using this technology, iron-lithium support 700km battery life, ternary support 1000km battery life, are expected to be available in June 2022.

The technical release of AVIC Lithium Battery has aroused a strong response on the scene and has attracted great attention from industry experts and colleagues. AVIC Lithium Battery has always adhered to the mission of "continuous innovation, benefiting mankind", guided by the "product and technology leadership strategy", vigorously carry out independent research and development, and collaborate with industrial chain partners to innovate, continue to build product leadership and provide full service Market, customer success, and continuous new contributions to the sustainable and healthy development of the new energy industry and the realization of the "dual carbon goal"! (Source: Kuchaer)