CR1620 battery

As battery quality affects safety and endurance, the performance of CR1620 battery needs to be broken through

Experts have different opinions on whether it can be achieved

Xiao Chengwei believes that the energy density of ternary lithium-ion power batteries can already be seen. The current high-nickel material and carbon-silicon negative electrode lithium battery should have a maximum single energy density of about 300 watt-hours/kilogram, plus or minus no more than 20 watt-hours/kilogram, so it should be impossible to rely on ternary material lithium-ion batteries to achieve the technical route planning goal of 350 watt-hours/kilogram. To achieve the technical route planning goal of 350 watt-hours/kilogram, we still need to hope for a new generation of lithium-ion batteries or solid-state batteries, but these two types of power batteries have not entered the stage of industrial application. Therefore, Xiao Chengwei predicts that the technical route planning goal of 350 watt-hours/kilogram may not be achieved by 2020.

Regarding whether 350 watt-hours/kilogram can be achieved, Ouyang Minggao, executive vice president of the China Electric Vehicle Hundred People's Association, leader of the overall expert group of major electric vehicle projects of the Ministry of Science and Technology, member of the Standing Committee of the National Committee of the Chinese People's Political Consultative Conference, and professor of Tsinghua University, is still relatively optimistic. He said that the density of lithium-ion power batteries is expected to reach 300 watt-hours/kilogram by 2020.

He said that the 300 watt-hour/kilogram battery cell to be industrialized in 2020 has made substantial breakthroughs. The technical routes adopted by CATL, Tianjin Lishen and Guoxuan High-tech are similar: the positive electrode is high-nickel ternary, and the negative electrode is silicon-carbon negative electrode. The 300 watt-hour/kilogram battery cell can produce a battery system of about 200-210 watt-hours/kilogram, which is a great improvement compared with the energy density of about 230 watt-hours/kilogram and the battery system of about 150 watt-hours/kilogram at the beginning of this year.

The "all-solid-state lithium battery" mentioned by Xiao Chengwei is a lithium battery in which the electrodes and electrolyte materials used in the working temperature range are solid and do not contain any liquid components. The full name is "all-solid-state electrolyte lithium battery". This all-solid-state lithium battery is divided into all-solid-state lithium primary battery and all-solid-state lithium secondary battery. All-solid-state lithium secondary battery is divided into all-solid-state lithium-ion battery and lithium metal battery.

Ouyang Minggao pointed out that currently, solid-state lithium-ion batteries have breakthroughs, performance advantages and industrial prospects. The difference between it and all-solid-state lithium batteries is that they are not all solid electrolytes. The electrolyte of a real solid-state lithium-ion battery is solid, but there is a small amount of liquid electrolyte in the battery cell; the so-called semi-solid state means that the solid electrolyte and the liquid electrolyte each account for half, or half of the battery cell is solid and half is liquid; the quasi-solid state is mainly solid and a small amount is liquid.

If the power battery fails to achieve the goal of the technical route planning, will the development of new energy vehicles in my country be hindered? Xiao Chengwei believes that it should not be. He pointed out that the performance of power batteries is not only affected by the specific energy density, but also by the specific power density, safety, consistency, cycle life and other factors of the power battery. Finding a balance point for industrial application between many indicators and costs is the key to supporting the development of new energy vehicles.

Battery quality affects safety and endurance

Because my country has a large area, people may be more anxious about the endurance mileage, so domestic power battery companies may pay more attention to the specific energy density. However, some power battery companies in Europe, Japan and other countries have different focuses on indicators such as specific power density, safety, and consistency in power battery technology.

Whether 350 watt-hours/kilogram can be achieved does not depend on prediction, but on technological breakthroughs and industrial applications. The reporter learned that the current domestic and foreign lithium-ion power battery monomer technology research and development is basically at the same level, but safety research needs to be strengthened. The core of this battery is safety.

Experts unanimously believe that the quality of power batteries affects the safety and endurance of electric vehicles, especially safety issues, which should be prevented first and should start from product design, especially when the battery specific energy continues to increase. Safety issues should be paid more attention to. At the same time, with the expansion of power battery production capacity, the product differences in my country's new energy vehicle power battery industry are becoming more and more large, which will undoubtedly set off a new round of industrial restructuring.

Yang Weibin, director of Huatai New Energy Research Institute, revealed that the endurance of my country's new energy vehicles has increased very rapidly in the past two years, on the one hand due to the increase in power battery energy density, and on the other hand due to the rapid decline in costs. With the advancement of power battery technology and the decline in costs, coupled with policy incentives, the advantages of electric vehicles over traditional fuel vehicles will gradually emerge in the future. Yang Weibin predicts that with the expansion of the industry and the large-scale application of power battery recycling, there is still room for further price reduction in the future. Xiao Chengwei pointed out that power battery technology is developing rapidly, but people have high requirements for batteries, hoping to be able to compete with fuel vehicles, and that energy density, power density, safety, cycle life, fast charging, temperature range and cost can all reach the expected goals. Therefore, the power battery industry still faces great challenges, but he believes that with the efforts of the entire industry, these goals can be achieved or close to being achieved.

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