18650 lithium ion battery cell

　　How CATL innovates fast-charging power 18650 lithium ion battery cell

　　Allowing power batteries to combine high energy density and fast charging characteristics is an important way to relieve consumers' range anxiety, and it is also a topic that the industry has been working hard to explore. CATL (hereinafter referred to as "CATL") has taken the lead in providing highly innovative solutions with its strong R&D capabilities.

　　On March 26, a seminar on high-power charging pilot projects for electric vehicles was successfully held in Ningde. More than 50 expert representatives from China Electricity Council, China Automotive Technology and Research Center, China Charging Alliance and other industry organizations, well-known domestic and foreign vehicle companies, charging facilities and connector manufacturers participated in the meeting discussion.

　　At the meeting site, CATL demonstrated to the participants the charging process of the EnerSpeedy super iron lithium battery using the "super iron lithium + high energy density fast charging graphite" system. This product is a 60Ah super iron lithium battery that can be charged at 5C. The demonstration process took 7 minutes and 12 seconds to complete charging from 20% to 80%, and charging from 20% to 100% only took 13 minutes and 8 seconds.

　　CATL broke the rules and broke through the technical bottleneck of the lithium iron phosphate-graphite system that cannot be charged quickly. While maintaining the advantages of high energy density, high safety, and long life of lithium iron phosphate, it achieved 5C rate fast charging. The comprehensive performance of CATLEnerSpeedy super iron lithium battery was highly recognized by participating experts.

　　In terms of energy density, the CATL super iron lithium battery system also has advantages in energy density. Among them, the 5C fast-energy products are above 70Wh/kg, the 3C high-energy products are above 115Wh/kg, and the energy density of common fast-charging battery systems on the market is The density is only between 40-60Wh/kg. High energy density means that equipped with a battery pack of the same weight, the cruising range of electric vehicles can be greatly improved and the number of charging times can be reduced.

　　In terms of cycle life, considering that bus application conditions are relatively harsh, the average number of full discharges is about 2 times a day. Rough calculations indicate that to meet 8 years of operation, the battery needs to be cycled more than 5,600 times. The super iron lithium battery developed by CATL has a cycle life of up to 10,000 cycles, which not only fully meets the operational needs of electric vehicles, but can also be used for energy storage and other tiered uses after retirement, bringing more economic value to customers.

　　In terms of weather resistance, in order to meet the requirements of low-temperature charging in northern winter and high-temperature working conditions in southern summer, CATL has specially developed an efficient thermal management system to ensure that the battery is in a reasonable temperature range. When the temperature is low, the battery core can be quickly heated, and the fast charging mode can be turned on when the temperature reaches the required temperature; when the temperature is high, the system will cool down the battery core, truly achieving "all-climate" fast charging.

　　Because of this, CATL's fast-charging super iron lithium battery has been highly recognized by the participants at this conference. Many vehicle companies have expressed that they will actively promote cooperation with CATL in high-power charging products.

　　Technically, how does CATL achieve this breakthrough in innovative fast charging solutions?

　　As we all know, when batteries with ordinary chemical systems are fast-charged, the negative electrode will produce by-products, which will affect the cycle and stability of the battery core. Fast charging can only be achieved by using negative electrode materials that can withstand the high current of fast charging. Therefore, in many people's perception, the "lithium iron phosphate + graphite" system does not seem to be suitable for fast-charging batteries.

　　In this regard, Dr. Wang, the person in charge of CATL's fast charging project, explained that the focus of fast charging is on the negative electrode, and the choice of the positive electrode, whether it is ternary or lithium iron phosphate, will not affect the performance of fast charging, and there are other reliability. Therefore, the core of fast charging technology is to accelerate the movement of lithium ions between the positive and negative electrodes through chemical system and design optimization, and reduce or block the production of negative electrode by-products.

　　"But there is a certain truth in saying that lithium iron phosphate is not suitable for fast charging, because the traditional lithium iron phosphate has poor conductivity, causing heat during fast charging." Dr. Wang added, so in response to the above two problems, CATL passed In-depth technical research provides innovative solutions.

　　On the surface of the negative electrode graphite, CATL uses "fast ion ring" technology to modify it. The modified graphite takes into account the characteristics of super fast charging and high energy density. During fast charging, the negative electrode no longer produces by-products, so the lithium ions in the graphite layer are greatly improved. embedding speed, thereby achieving excellent rate performance, high energy density and long cycle life.

　　In addition, the fast charging products developed by CATL are equipped with a self-developed thermal management system that accurately sets the "healthy charging range" under different temperatures and SOC, greatly broadening the operating temperature of 18650 lithium ion battery cell, thereby achieving "all-climate" fast charging.

　　CATL super iron lithium fast charging products have been applied in batches and have accumulated rich application experience. Currently, more than 2,600 electric buses equipped with CATL super fast charging products are running on the market. They are running in good condition and have won the favor of vehicle companies and bus users. of praise.

　　In addition, CATL has also developed a fast-charging battery based on the ternary system for passenger cars, which can charge the SOC from 5% to 85% in 15 minutes, with an energy density of 190Wh/kg and a cycle life of more than 2,500 times. One step before ensuring 4C fast charging, the energy density can continue to be increased to 210Wh/kg. This fast charging technology will be first used in the electric taxi market, achieving a driving range of 350KM and completing charging within 30 minutes. Currently, many passenger car companies are cooperating with CATL on the development of fast charging products.

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