However, in the long run, improving the performance of electric vehicles through the innovation of the battery system is the fundamental way to enhance competitiveness. The development of the current battery system is mainly divided into two phases. One is the direction of high specific energy represented by solid-state batteries and high nickel ternary; the other is the direction of high rate represented by fast charging.

　　GAC officially announced its entry into the power battery field.　　 This piece of news says that it’s not small, but it’s not too big, because car companies dominated power battery packs for a long time. After all, there is no battery pack design technology, and there is no way to talk about positive research and development.　　 Compared with the new type of lithium battery technology, which is almost impossible to be applied on a large scale in the short term, the improvement in the structural design of the power battery has more practical benefits. You must know that from the single cell to the battery system is the weak link of the domestic new energy industry.　　 However, in the long run, improving the performance of electric vehicles through the innovation of the battery system is the fundamental way to enhance competitiveness. The development of the current battery system is mainly divided into two phases. One is the direction of high specific energy represented by solid-state batteries and high nickel ternary; the other is the direction of high rate represented by fast charging. Improving energy density has always been the focus of research at home and abroad, and I won’t go into details here; the high-rate direction is mainly reflected in high-power and fast-charge batteries, which are popular in hybrid vehicles and some subdivisions, and shocked the world last year. Israel’s 5min flash charging black technology is a typical representative of this direction. In addition, Japan’s Toshiba is very prominent in this field, and China is led by Weihong Power.　　 "Insufficient battery life, fast charge to get together", although to some extent, fast charging can greatly alleviate consumers' mileage anxiety, but because the grid load is too large, it has been criticized by the industry. However, Japan’s Toshiba and Porsche have both made breakthroughs in the fast charging field recently, which may point the way for the fast charging field.　　 Let’s take a look at the new technologies and major events in the lithium battery industry this week.　　1. Toshiba’s new generation SCiB lithium-ion battery for vehicles can be charged for 6 minutes with a battery life of 320km　　 Recently, Toshiba officially announced that it has successfully developed a new generation of SCiB lithium-ion batteries for vehicles, which have the advantages of high energy density and extremely fast charging. According to Toshiba's official measured data (Japan JC08 standard), this new type of lithium-ion battery can charge for 6 minutes and drive 320 kilometers, which is three times the traditional lithium-ion battery. Toshiba’s official website stated in the announcement that the company launched SuperChargeionBattery (SCiB) in 2008, using lithium titanate as the negative electrode, which can achieve rapid charge and discharge, with a lifespan of up to 15,000 times, and in an environment of minus 30°C. Can also be used in.　　Through technological research and development, Toshiba has developed a lithium-ion battery using titanium niobium oxide as the negative electrode material on this basis, and its lithium ion storage capacity is twice that of the lithium battery with graphite as the negative electrode material. At the same time, Toshiba also showed a sample of the new lithium battery, 50Ah, with a size of only 111mmx194mmx14.5mm. It is reported that it can reach 90% of the power in 6 minutes, while the lithium battery of traditional electric vehicles can only be charged to 80% in 30 minutes even if fast charging is used.　　 According to reports, the new generation of lithium batteries can still maintain more than 90% of the battery capacity after being charged and discharged 5000 times, and the loss rate is extremely low. In addition, fast charging can also be achieved in a low temperature environment of minus 10°C. Toshiba said that the new titanium niobium oxide anode material and the new generation of SCiB batteries are a disruptive advancement that is expected to have a significant impact on the battery life and performance of electric vehicles. It is reported that the new generation of SCiB batteries is expected to be commercially available in 2019.　　Comment: In fact, before the rise in the popularity of solid-state batteries, fast charging technology has always been the focus of corporate research, but it has not made practical progress, because it is difficult to take into account energy density, cycle life, and safety while ensuring fast charging. The domestically outstanding one in the field of fast charging is Weihong Power, which has relatively comprehensive performance, but it is still a long way from being accepted by consumers. However, the next-generation energy lithium battery represented by solid-state batteries has not reached the level of industrialization. It is difficult to say who will gain an advantage in the market in the future. I personally believe that fast-charging batteries are more suitable for hybrid vehicles and other special types. Of the subdivisions. "2. Technology to increase fuel cell life" "The core factor that determines the performance of solid oxide fuel cells is the cathode that undergoes oxygen reduction reactions. Usually, oxides with perovskite structure (ABO3) are used in the cathode. However, although perovskite oxide has high performance in initial operation, its performance declines with time, limiting its long-term use. In particular, the conditions of the high-temperature oxidation state required for the operation of the cathode lead to the phenomenon of surface segregation, in which a second phase such as strontium oxide (SrOx) accumulates on the surface of the oxide, resulting in a decrease in electrode performance.　　Using computational chemistry and experimental data, Professor WooChulJung's team from the Department of Materials Science and Engineering observed that the local squeezed state around Sr atoms in the perovskite electrode lattice weakened the Sr-O bond strength, thereby promoting the separation of strontium. The team found that local changes in the strain distribution in the perovskite oxide are the main reason for the separation of the strontium surface. Based on these findings, the team incorporated metals of different sizes in the oxide to control the degree of lattice strain in the cathode material and effectively suppress strontium segregation. Professor WooChulJung said: "This technology can be achieved by adding a small amount of metal atoms in the material synthesis process without the need for additional processes. I hope this technology will be effective in developing highly durable perovskite oxide electrodes. "　　Comment: The fuel cell life issue is actually very complicated. The biggest problem at present is caused by the working conditions of the car. The current changes caused by start-stop, acceleration, deceleration, etc., attenuate the membrane electrode more seriously, which is why the fuel cell at this stage Automobiles use hybrid power system assembly solutions because the battery can carry and reduce the impact of current changes on the fuel cell. Therefore, only from the experimental research of the fuel cell itself to improve the life, the gold content is not high, or the actual benefits are very small. 3. The charging voltage of MissionE can reach 800V. Porsche said that MissionE will use 800V high-voltage ultra-fast charging system. Compared with the more popular 400V charging system, it can theoretically shorten the charging time by twice, allowing MissionE to realize charging. It takes 20 minutes to drive 400 kilometers, which is enough to drive from Nanjing to Shanghai. Compared with the traditional way of refueling, 20 minutes is not unacceptable. It is worth mentioning that there are mainly two solutions for high-voltage fast charging and low-voltage fast charging on smart phones, and for electric vehicles, they are actually similar, because low-voltage fast charging has a higher current-carrying capacity for cables. Requirements, so Porsche finally chose high-voltage fast charging.　　Porsche MissionE has increased the voltage of some vehicle electronic control systems to 48V, which can provide more power supply for related components, and the performance improvement will follow. A similar approach has also appeared on Bentley Bentayga before. As for other on-board auxiliary systems, they are maintained at the standard 12V.　　 Comment: In fact, there are several major bottlenecks in fast charging. The first is the fast charging technology of the battery itself, and the second is the high-power charging pile. These two points have not been effectively resolved. The 800v fast charge introduced by Porsche is actually not available on a large scale under the existing conditions. It is more of a demonstration. But at least Porsche's advanced technology proves the feasibility of fast charging in the future.