Can it be: the power battery is high-energy and fast-charging?

　　Can batteries have both high energy density and ultra-fast charging? Microvast Power, which was first known for its fast-charging batteries, has explored this under current and future technical conditions. At the 2019 Shanghai Auto Show, Microvast Power brought three batteries specially designed for pure electric passenger cars, with 1C, 1.6c-1.8c and 2C fast charging capabilities; it also has 270Wh/kg, 225Wh/kg and 205Wh/kg energy density. Microvast Power’s three passenger car batteries are not enough, you might say. Can it be more powerful and charge faster? In this regard, Guo Shengchang, director of Microvast battery system design, said that Microvast Power’s previous products have stronger fast charging capabilities, but the products developed based on the operational needs of the passenger car market take into account the characteristics of low cost, standardization, and diversified performance. . For the future, new material systems for power batteries that can significantly increase energy density have not yet been commercialized. Moreover, the increase in energy density often has a negative impact on fast charging capabilities. Therefore, Micromacro Power's strategy is not to go to the extreme of energy density or fast charging, but to take into account the factors of energy density, fast charging capability and cost. 1 Entering the passenger car market, Microvast Power is one of the established power battery companies and was established in 2006. Previously, its products were known for fast charging and were mainly commercial vehicles. In China, the earliest batch application of Microvas power batteries was in April 2011. The first batch of six fast-charging pure electric buses were officially put into operation in Chongqing. These buses are manufactured by Hengtong Bus and use Microvast power batteries, with charging time within 10 minutes. At that time, the launch of these fast-charging buses also marked the official launch of the commercial operation of domestic fast-charging buses. Later, Chongqing Public Transport successively purchased 1,500 fast-charging buses. Chongqing Public Transport's fast-charging buses use Micromacro batteries. Micromacro's fast-charging batteries are supplied to domestic and foreign electric and plug-in hybrid vehicles. In recent years, at least four generations of batteries have been developed and produced, and are sold at home and abroad, as far away as the United Kingdom. , Belgium, New Zealand, Moscow. Larger projects include power batteries for over a thousand red double-decker buses in London; 120 hybrid buses in Belgium, etc. Moscow electric buses using Microvast power batteries According to statistics from Microvast Power, as of the end of 2008, the total number of commercial vehicles equipped with Microvast battery systems in the world reached 25,000, with a cumulative operating mileage of more than 2.3 billion kilometers, ranking 16th in the world. It operates continuously in more than 160 cities in several countries and maintains a record of zero operational safety accidents. By 2018, Microvast Power began to focus on the passenger car market. In September 2018, Microvast Power appeared in the supplier list of pure electric passenger vehicles. In the "Catalogue of Recommended Models for the Promotion and Application of New Energy Vehicles (9th Batch in 2018)" released that month, the power battery of the Changan Eado EV (SC7003AKBEV), which was newly entered into the catalog, was manufactured by Weihong Power. In March 2019, the second batch of the "Catalogue of Recommended Models for the Promotion and Application of New Energy Vehicles" was released, and Microvast Power once again entered the passenger car supporting market. The Chongqing Lifan pure electric passenger car using Microvast power cells has a battery system energy density of 160Wh/kg and a cruising range of 400km. According to the new subsidy policy in 2019, the above two models are within the scope of national subsidies and can receive subsidies of 14,400 and 25,000 respectively. Lifan electric cars equipped with Microvast fast-charging batteries have been supplied by Changan and Lifan, which means that Microvast power batteries have achieved a breakthrough in business. Behind this is the product's transformation from fast-charging to multiple features that are more needed for passenger cars. Balanced type. 2 Multiple Performance Balances Guo Shengchang believes that there are two main pain points for pure electric passenger cars now, one is short cruising range, and the other is long charging time. To this end, the passenger car power battery launched by Microvast Power takes into account both energy density and fast charging capability. At the same time, three models are launched based on the combination of energy density and fast charging capability, allowing different car manufacturers to choose. Data source: The energy density of Micromacro Power's 52Ah product has reached 270Wh/kg, which is at the same level as the highest energy density products currently mass-produced and supplied in China. Guo Shengchang said that such a battery can support a driving range of 400 kilometers and basically compete with fuel vehicles. The 48Ah product is suitable for online car-hailing and taxis. The system energy density can also reach 140wh/kg, which is above a certain cruising range. It can also be charged quickly to meet the operation of online car-hailing and taxis. The 44Ah product is used in taxis with higher operating mileage. It can be quickly charged from 0% to 80% in 20 minutes and 100% in 30 minutes, which can meet the needs of all-weather operations. Guo Shengchang believes that these three products have different power densities and energy densities, but the same size. They are all VDA sizes, suitable for the operational needs of the passenger car market, and take into account the characteristics of low cost, standardization, and diversified performance. 3Higher energy and faster charging? In the future, Microvast Power will continue to work hard on batteries with relatively high specific energy and relatively fast charging capabilities. According to the information previously disclosed by the person in charge of Microvast Power, in the fourth quarter of 2020, Microvast Power also plans to mass-produce products with a capacity of 300wh/kg, 1C charge and discharge, and a cycle life of more than 1,200 times. By the fourth quarter of 2021, Microvast plans to launch 350wh/kg, which can charge 40% of the power in the mid-range SOC in 15 minutes at a 4C rate, with a cycle life of more than 800 times. These two products use ternary + silicon carbon negative electrode materials. As for new material systems that will increase energy density over a larger span in the future, Guo Shengchang said it remains to be seen. Due to the pursuit of high specific energy, generally speaking, it will have a negative impact on fast charging energy. Therefore, Micromacro Power's product direction will still be to have both energy density and power density while striving for low cost.

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