What progress has been made in the development of high-temperature lithium 3400mah 3.7v 18650 battery in Japan?

　　From April 24 to 26, the 9th China International Energy Storage Conference, hosted by the Energy Storage Application Branch of the China Chemical and Physical Power Industry Association, was held at the InterContinental Hotel in Hangzhou, Zhejiang Province. At the "Hydrogen Energy and lithium 3400mah 3.7v 18650 battery" special session on the morning of April 26, Liu Shixue, chief engineer of hydrogen energy and energy storage at CGN Research Institute Co., Ltd., shared a keynote speech entitled "Progress in the Development of High-Temperature lithium 3400mah 3.7v 18650 battery in Japan and Hydrogen Energy of CGN Research Institute". The following is the transcript of the speech:

　　Liu Shixue: I am very happy to be here today to talk about the progress of high-temperature lithium 3400mah 3.7v 18650 battery.

　　Let's talk about the application of lithium 3400mah 3.7v 18650 battery first. As you know, there are low-temperature and high-temperature lithium 3400mah 3.7v 18650 battery. This is in the planning of Japan's Ministry of Resources and Energy. lithium 3400mah 3.7v 18650 battery can be used in home and automotive fields. Now it is low-temperature lithium 3400mah 3.7v 18650 battery, mainly proton exchange membrane lithium 3400mah 3.7v 18650 battery. The application in the automotive field is actually determined by the advantages and disadvantages of various lithium 3400mah 3.7v 18650 battery themselves. Use in cars requires a relatively high energy density. The operating temperature of low-temperature lithium 3400mah 3.7v 18650 battery is relatively low, and its heat does not need to be recovered very high, so it has a relatively high energy utilization efficiency. If it is a high-temperature fuel cell, its exhaust gas temperature may exceed 600 degrees. If this heat energy is not used well, the overall efficiency will be reduced. It is impossible to carry a large heat storage tank on the car, so high-temperature lithium 3400mah 3.7v 18650 battery must be used in fixed areas, which is its limitation. When used in distributed power generation or large power stations, the advantages of high-temperature lithium 3400mah 3.7v 18650 battery are reflected. Adding a gas turbine behind the fuel cell, plus partial heat recovery, this method will show its advantages when used in power stations.

　　High-temperature lithium 3400mah 3.7v 18650 battery, because it is mainly an area I am good at, I will mainly talk about the development of this area. In addition to solid oxide lithium 3400mah 3.7v 18650 battery, there is also a technology such as molten carbonate that Mr. Cheng will talk about next. It is very suitable for large power stations. Speaking of the benefits of solid oxide lithium 3400mah 3.7v 18650 battery, it can use more fuel. Even using biogas to purify it, it can be reformed and used directly in high-temperature solid oxide lithium 3400mah 3.7v 18650 battery. In Japan, the imagined application scenarios include portable power supplies, household cogeneration devices, car range extenders, and distributed power stations. In the upper right corner of the picture, you can see that the power generation efficiency of SOFC can reach more than 50%. If it is used in conjunction with heat, there is a higher energy utilization rate. Why has hydrogen become an important option in Japan's energy planning? Because almost all of Japan's energy is imported, including natural gas and other energy raw materials, then importing hydrogen is also a good choice for it. The great advantage of importing hydrogen is that if you consider the issue of carbon emissions in the future, if you import hydrogen, there will be no carbon emission problem when you use hydrogen domestically. This is also a reason for choice.

　　Regarding the source of hydrogen, there are various sources of hydrogen on the left. It can be transported through pipelines. If it is imported from abroad, the mature transport ships now can completely transport it to the country in the form of liquefied hydrogen, and then use it in various application fields. This page wants to explain the model of SOFC research and development in Japan. Their joint research and development structure of industry, academia and research that can be jointly participated by enterprises and research institutes. The one on the left is a project supported by NEDO, similar to the domestic 863 project. Through this project, research and development enterprises are integrated with universities and research institutes to conduct a joint research and development. There is also the JST CREST project on the right, which is similar to our 973 project, mainly doing some basic scientific research. There is also a kind of support, which is regional support. For example, Kitakyushu City promotes the use of hydrogen energy as a business card of the city, such as promoting the construction of hydrogen refueling stations.

　　In the development of single cells and battery stacks, I have listed some of the more famous R&D institutions at present. For example, the tubular structure of Dianzhongyan and the small cylindrical battery of TOTO. Kyocera makes a flat tubular fuel cell, which is similar to the battery structure that Ningbo Institute is developing as mentioned above. Kyocera's solid oxide fuel cell is the best in commercialization. In universities, they can do various academic research to provide consulting services to enterprises. In such a project, universities can help enterprises solve the problems they encounter. This is the progress of the NEDO project mentioned above. At the SOFC Annual Meeting in the United States in 2017, they reported a result. The lithium 3400mah 3.7v 18650 battery made by various companies were uniformly tested and evaluated in their projects. As you can see, this figure is basically arranged from good to bad in terms of performance from left to right. The ones with a blue background have a lower attenuation rate. The battery stack of Dianzhongyan can be tested for more than 20,000 hours, and its attenuation rate is only 0.1% per thousand hours. As we mentioned earlier, Dianzhongyan uses a tubular structure. This tubular structure is sealed by itself, so it is easier to achieve a long life design. Kyocera's flat tubes and similar structures are easier to achieve long life. Flat structures are relatively difficult to seal. The sealing material between the connecting plate and the battery cell will weaken after long-term operation, which will affect the life.

　　Let's take a look at the products of various companies. This is a cogeneration device for home use made by Aisin Seiki. As mentioned earlier, SOFC has an advantage. It works at 600 to 700 degrees Celsius, and its exhaust gas contains more heat energy. At this time, the heat energy must be used. This type of home cogeneration has a pure power generation efficiency of 52%. This is already a relatively high power generation efficiency. At the same time, its heat can be recovered. The overall efficiency can reach 87%. It is amazing that such a device can achieve such a high energy utilization rate. The battery stack used in this device of Aisin Seiki is a Kyocera battery stack. Cogeneration devices are of PEFC type and SOFC type. Here is a rough statistics of sales and prices in 2016. The line below shows that the selling price is linearly decreasing. The goal they set for 2019 is to produce a household cogeneration device with a power of about 1 kilowatt, and the SOFC type will cost about 60,000 yuan. In Japan, their household users may be able to afford such a price. For Chinese consumers, the average consumption level of ordinary residents is about one-third of that in Japan. To sell such equipment in China, the price must be controlled within 20,000 yuan.

　　The next one is a 4.2-kilowatt device made by Miura Industries, which also requires comprehensive utilization of power generation and heat. The following power generation equipment made by Mitsubishi Hitachi Power Systems has a power of more than 200 kilowatts. It has a SOFC power generation device in front and a gas turbine power generation device in the back. The whole can be used as a small power station. When it was demonstrated in 2013, it could already achieve a power generation efficiency of 50%. This figure shows that a power generation system was built in Toyota's factory in 2013. The following comprehensive power generation system was built on the campus of Kyushu University in 2015. The comprehensive power generation efficiency is about 55%. If there is a heat recovery in the back, the overall efficiency can reach 65%. This is a power generation device designed by Fuji Electric, which was displayed at the SOFC Annual Conference in Japan. This is the SOFC system that Hitachi Zosen started to test run in a park in Osaka in 2018. The last one is a device being developed by DENSO. They have now received a NEDO support project and want to use it in waste recycling plants to reform waste fuel and generate electricity. The following is a small portable power generation device developed by the Institute of Industrial Research. The medium-temperature proton conductive solid oxide fuel cell is now being developed by Panasonic Electric.

　　Next, I will talk about some of the things that CGN Research Institute has done in hydrogen energy. We have a Shenzhen Hydrogen Energy Safety Engineering Technology Research Center. When using hydrogen energy, safety issues have always been a concern for many people. We established such a research center with the starting point of ensuring hydrogen safety and supporting the development of the hydrogen energy industry. We hope to conduct some safety performance testing experiments for some equipment and promote the establishment of safety evaluation standards and identification systems. We uphold CGN's philosophy on nuclear power safety and use it for the protection and protection of hydrogen energy safety. Based on our company's existing research foundation, the next step of hydrogen safety research will focus on gas leakage diffusion, jet flow, and tank safety testing. In terms of solid oxide lithium 3400mah 3.7v 18650 battery, we hope to be market-oriented and focus on the research and development of power generation systems by combining our own advantages in system integration. We welcome cooperation with domestic universities and research institutes to promote hydrogen energy safety research and the development of the solid oxide fuel cell industry. Thank you!

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