Analysis of the four core 18650 battery 4800mah technologies of CATL

　　After capturing China's largest 18650 battery 4800mah market share, CATL began to turn its attention to the vast European market.

　　At the ongoing Frankfurt Auto Show, CATL demonstrated a number of core technologies including low-cost CTP highly integrated 18650 battery 4800mah development platform, super fast charging technology, ultra-long life battery and battery self-heating & BMS technology, representing the success of Chinese battery companies. The technical level in the field of 18650 battery 4800mah technology.

　　Let’s take a closer look at what “black technologies” CATL has in the field of power batteries.

　　1. CTP highly integrated 18650 battery 4800mah development platform (Cell To Pack)

　　At present, the battery packs of domestic and foreign battery companies and car companies basically adopt the grouping method from single unit to module to battery pack. The multi-level grouping method ensures battery safety, but it will sacrifice the space of the battery pack. interest rate and energy density.

　　In this regard, CATL launched a new CTP highly integrated 18650 battery 4800mah development platform (Cell To Pack) at the exhibition, in which the battery cells are directly integrated into the battery pack.

　　Ningde Times said that due to the elimination of the battery module assembly process, compared with traditional battery packs, the volume utilization rate of CTP battery packs has increased by 15%-20%, the number of battery pack components has been reduced by 40%, and production efficiency has increased by 50%. Significantly reduce the manufacturing cost of power batteries.

　　At the same time, thanks to the simplification of the internal structure, the energy density of CTP battery packs will be increased by 10%-15% compared with traditional battery packs. The average energy density of traditional battery packs is 180Wh/kg, while the energy density of CTP battery packs can reach more than 200Wh/kg.

　　At present, CATL has obtained more than 70 CTP core patents, and it is expected that more new technologies will be applied to CTP battery packs in the future to ensure product safety.

　　Industry insiders pointed out that 18650 battery 4800mah module removal has a positive effect on optimizing battery pack space utilization, increasing energy density and reducing costs. It is more suitable for standard battery boxes, helps car companies and battery companies reduce manufacturing costs, and is expected to become the future 18650 battery 4800mah. One of the mainstream technologies.

　　Currently, in addition to CATL, battery companies including Cellular Energy and BYD are also developing CTP technology. It is expected that more battery companies will launch CTP batteries in the future.

　　2. Super fast charging technology

　　Although the energy density of power batteries has been continuously improved in recent years, it still has not solved the problems of short cruising range and long charging time of electric vehicles. Fast charging technology has become a feasible way to solve the problem of cruising range anxiety.

　　In this regard, CATL has customized super fast charging products based on market demand. The super fast-charging battery demonstrated by CATL only takes 15 minutes to increase the battery state of charge (SOC) from 8% to 80%. In response to some customized needs, CATL has also developed a turbine charging solution that can charge 80% of the battery in 9 minutes.

　　It is understood that the fast charging technology of CATL batteries adopts a constant potential closed-loop control algorithm. The core of the algorithm is based on the development of the internal polarization state of the battery. The principle is based on the electrochemical model. By controlling the anode potential to be constantly higher than the lithium evolution potential threshold, the input charging current is maximized. The input of current will affect the anode potential, thus forming a closed-loop control to minimize the battery charging time.

　　It is worth noting that at the 2018 Ningde Electric Vehicle High-Power Charging Pilot Symposium, CATL demonstrated 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.

　　3. Super long life battery

　　In addition to low energy density and long charging time, the rapid decline of 18650 battery 4800mah capacity has also become an important reason that hinders the further growth of the electric vehicle market and increases the cost of use for consumers.

　　In this regard, in order to avoid the increased cost and inconvenience caused by battery replacement, CATL has developed battery products that match the service life of the vehicle based on different usage scenarios of users.

　　For daily use of private cars, the ultra-long-life battery developed by CATL can meet the driving needs of more than 8 years; for operating vehicles, it provides long-life battery products that can operate for 6 years and 600,000 kilometers, truly achieving worry-free product life cycle . Long-life battery products can also meet multiple application scenarios such as V2G and echelon utilization, thereby improving the economy of electric vehicles.

　　4. Battery self-heating & BMS technology

　　Power batteries have very high requirements for the temperature environment. Low temperatures in winter will affect the battery's endurance. As battery technology continues to improve, the temperature range within which it maintains optimal working conditions is becoming wider and wider.

　　The self-heating technology demonstrated by CATL identifies the battery status through the BMS battery management system and formulates a rapid heating control strategy, which can increase the battery temperature from -20°C to 10°C in 15 minutes, increasing the charging capacity by 5 times and the discharging capacity by 7 times. , thereby extending battery life.

　　At the same time, CATL will establish a complete safety guarantee system covering product design, cell manufacturing, system integration, BMS management, after-sales service, scrap recycling, etc. to ensure the safety of power batteries in all aspects.

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