The appraisal committee was headed by Academician Zhang Tao from the Chinese Academy of Sciences. It was composed of Academician Zhang Suojiang, Academician Zhang Jin, Academician Sun Lili from the Chinese Academy of Engineering, Vice Chairman and Secretary-General of the China Chemical Society Fang Daxun, President of the State Grid Power Engineering Research Institute Liu Qianwei, Former Vice President and Secretary-General of the China Petroleum and Chemical Research Institute Hu Jie, Deputy Director of the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences Li Xuanping, and President of the School of Materials Science and Engineering at Peking University Zou Ruiqiang. The director of the Special Project II of the International Science Cooperation Center of the Ministry of Science and Technology, Xin Bingqing, the deputy director of the Science and Technology Department of Henan Province Chen Zhiqiang, the Party Secretary and Organization Secretary of Kaifeng City Gao Zhigang, the Party Secretary and Organization Secretary of Lankao County Wu Jingxing, and the heads of relevant functional departments such as science and technology, development and reform, and industry and information technology at the municipal, county and provincial levels in Henan Province and other regions, all attended as witnesses. Academician Xu Chunming, the chief scientist of China Ocean Energy Storage, General Manager Wang Shen, Chief Technology Officer Xu Quan and other core team members of the company attended the entire meeting. 

The project is running smoothly and has six prominent advantages. 

During the project inspection phase, the expert group conducted a review through on-site inspections, data verification, and outcome examination of the Zhonghai Energy Storage Iron-Chromium Liquid Flow Battery Energy Storage Project. They visited the 2.5MW/15MWh iron-chromium liquid flow battery source-grid-load-storage commercial energy storage station in the New Energy Industrial Park of Lankao Economic Development Zone. They conducted a comprehensive and professional technical review of the core facilities such as the operation status of the energy storage system, key parameters, intelligent control platform, as well as the technological innovation, performance stability, safety reliability, and market application value of this project. The deputy general manager and project leader of Zhonghai Energy Storage, Gong Jiyu, gave a systematic explanation of the project's construction process, technical principles, actual operating parameters, and industrial application results. All the power stacks used in this project are self-developed 40kW power stacks, with a cycling frequency exceeding 20,000 times, a system design life of over 20 years, an annual charging and discharging electricity volume of 3,517,500 kilowatt-hours, and an annual reduction of approximately 54,500 tons of standard coal and 20,700 tons of carbon dioxide emissions (taking Henan Province as an example). The key indicator data of this project are excellent, demonstrating the maturity and reliability of Zhonghai Energy Storage's independently developed iron-chromium liquid flow energy storage equipment in system integration efficiency, charging and discharging stability, thermal management control, and intelligent operation and maintenance, fully verifying the advanced technology of the product for multi-scenario applications such as grid peak shaving, industrial energy storage, new energy support, and computing-electricity coordination. The evaluation experts were able to intuitively verify the outstanding advantages of Zhonghai Energy Storage's iron-chromium liquid flow battery in terms of strong safety, low cost, large scale, long lifespan, high performance, and wide application. 

Four core innovations, achieving full-chain self-control and autonomy 

During the technical inquiry session, the expert group focused on the entire industrial chain dimensions such as the innovation of Zhonghai Energy Storage's iron-chromium liquid flow battery, the maturity of the process, safety and reliability, large-scale intelligent control level, grid adaptability, economic and social benefits, industrialization promotion prospects, etc., carefully reviewing the product inspection reports, patent certificates, experimental data, process documents and other complete technical materials. They also conducted special inquiries face-to-face with the company's technical personnel. The research team detailedly reported the background of product development, technical principles, core processes, innovative highlights, test data, trial production process and industrialization application plans. They also conducted special defenses on the breakthroughs and optimizations in core technologies such as safety protection, energy efficiency improvement, intelligent control, environmental adaptability and long-term operation in the product. The expert group highly affirmed the ability and value of Zhonghai Energy Storage's iron-chromium liquid flow battery technology products in achieving systematic breakthroughs in the four major fields of core material domestication, stack integration, system coupling and intelligent control, and filling multiple industry shortcomings, realizing full industrial chain autonomy and controllability. 

Authoritative appraisal conclusion: The overall technology has reached the international leading level. 

During the expert appraisal stage, the expert panel of the appraisal committee conducted on-site investigations, raised inquiries, held concentrated discussions, and verified the relevant materials. After thorough discussion and comprehensive analysis and consultation, they unanimously reached an appraisal conclusion: The technical data of the project is complete and the data is detailed, meeting the conditions for outcome evaluation. The project overcame the problems such as hydrogen evolution in iron-chromium liquid flow batteries, low chromium activity, insufficient mass transfer, and poor consistency of the cell stack. It successfully developed key core technologies in materials, cell stacks, and system integration. It achieved a series of key innovations in electrode materials, electrolyte, cell stack design, and energy storage system integration, improving the activity of the electrodes, enhancing the stability of the electrolyte, solving problems such as uneven fluid distribution within single cells and cell stacks, and successfully developed a 40kW high-power density cell stack with a working current density of 160mA/c㎡ and a single-stack efficiency of 82%. It also overcame key technologies in the design integration and intelligent control of the energy storage system, and implemented a 2.5MW/15MWh iron-chromium liquid flow battery energy storage demonstration project. The system achieved a comprehensive efficiency of 67%. The project now holds 31 invention patents, including 1 international patent. It has published 21 papers and led the formulation of 1 industry standard, forming a complete independent intellectual property system. It has excellent innovativeness and practicality and meets the conditions for industrialization promotion. The overall technology of this project has reached the international leading level. 

At the same time, the expert group provided professional guidance on aspects such as product iteration and upgrade, scenario expansion, and cost optimization for the company. This guidance pointed out the direction for the company's subsequent technological research and market expansion. Through this assessment, the innovative advantages of China Ocean Energy's iron-chromium liquid flow battery technology were prominently displayed, the manufacturing process was mature, the equipment operation was safe and reliable, the project's economic and social benefits were outstanding, and it has fully met the conditions for large-scale industrialization implementation. This will strongly lead the domestic iron-chromium liquid flow battery industry towards standardization, large-scale production, and intelligence, providing solid support for the construction of new power grids and green computing infrastructure. 

Consolidate consensus and jointly draw a new blueprint for long-term energy storage. 

This appraisal meeting received strong support from the Ministry of Science and Technology, relevant departments of Henan Province, Kaifeng City, and Lankao County. Relevant leaders shared their views based on the technology and industrial practice of iron-chromium liquid flow batteries, jointly drawing a new blueprint for the development of long-duration energy storage industry. 

The Party Secretary and Minister of Organization of Lankao County said in his speech that Lankao County, as the birthplace of Jiao Yulu's spirit, the first county in China to pilot rural energy revolution and the deepening pilot county for energy revolution, has relied on the layout of industrial chain resources to develop new energy industries and gather high-quality industrial projects. After China Ocean Energy Storage was located in Lankao, it has deeply engaged in the research and development of iron-chromium liquid flow batteries, built the first fully digital intelligent factory in China and the world's first dedicated intelligent manufacturing production line, achieving independent breakthroughs in key technologies and large-scale implementation, driving the employment of over 500 local people, and achieving coordinated development of economy, society and people's livelihood. In the future, Lankao will continue to optimize the business environment, implement precise policies in terms of policies, talents, projects and application scenarios, fully assist enterprises in technological iteration and upgrading, capacity improvement and expansion, and market expansion across the board, and strive to build a leading long-term energy storage industrial demonstration base in the province and a well-known domestic long-term energy storage industry base, striving to write a new chapter of energy revolution and green, high-quality development in the county. 

In his speech, General Manager Wang Sheng of the company mentioned that with the acceleration of the construction of the new power system and the in-depth implementation of the "carbon neutrality" strategy, the shortage of long-term energy storage supply has become a key pain point that hinders the consumption of new energy, the stable operation of the power grid, and the implementation of the integration of electricity and computing. The company has been deeply engaged in the iron-chromium liquid flow battery technology route for over a decade, closely following the national energy development needs. On the one hand, it has established a complete and graded scientific research team to lay a solid foundation for technological independent innovation; on the other hand, it has built an independent and controllable full industrial chain system to fill the gaps in upstream and downstream support, and has implemented the strategic layout of "one core, one north, one center, one south" in Beijing, Inner Mongolia, Henan, and Guangdong, successfully obtaining the title of a national high-tech enterprise and an "enterprise with a low-cost liquid flow battery chain" by the Ministry of Industry and Information Technology. He emphasized that the company will take this appraisal as a new starting point, focus on four directions of technological innovation, production capacity construction, market expansion, and leading the industrial chain, empower the construction of the new power system, and strive to build a global leading enterprise in iron-chromium liquid flow batteries by the end of the "15th Five-Year Plan". 

The successful passage of this energy storage product by the authoritative technical assessment by Zhonghai Energy Storage is an important milestone for the company's continuous deepening of energy storage technology research and development and its commitment to independent innovation. It fully demonstrates the company's technical research capabilities and product core competitiveness in the field of new energy storage. Over the years, the company has always focused on the core track of new energy storage, using technological innovation as the driving force, delving into key technical fields such as energy storage system integration, safety control, and intelligent operation and maintenance, continuously increasing research and development investment, constantly improving product performance, overcoming industry technical bottlenecks, and striving to create a safe, efficient, intelligent, and reliable one-stop energy storage solution. 

In the future, the company will take this technical assessment as an opportunity to incorporate the valuable suggestions from the expert group, continuously promote the iteration and upgrade of energy storage technology as well as the optimization and improvement of products, and accelerate the pace of industrialization of scientific research achievements. At the same time, based on the development trend of the new energy industry, it will deeply explore the multi-scenario applications of energy storage, continuously break through core key technologies, and provide high-quality, high-tech and highly reliable energy storage products to contribute to the large-scale and high-quality development of the new energy industry and the realization of the country's "carbon neutrality" goal. 

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