Adhere to multiple technical routes in parallel - Chaowei lithium-ion battery

Recently, the Ministry of Industry and Information Technology released the "Recommended Models for the Promotion and Application of New Energy Vehicles". Among them, there is no ternary electric commercial bus, which means that vehicles that have not entered the Catalogue will not be able to enjoy government subsidies and tax exemption (10%), preferential policies. A paper ternary lithium battery "suspension order" has invested a "bomb" in the burgeoning Chinese new energy automobile industry, which has led to technological disputes concerning lithium battery research and development, and at the same time, brought huge uncertainties to the development of the industry. Some manufacturers of various roads have taken the high-level route - the diplomatic credentials, and some have taken the grassroots route - co-branded, so busy.

Among the numerous opinion teams, Dr. Kirk, the deputy dean of the Chaowei Group Research Institute and the national “Thousand Talents Program” expert, said in an interview with the reporter that because Chaowei has always insisted on multiple technical routes and multiple specifications, the products were batched. Among the power battery products put into the market, there are both the main push lithium iron phosphate battery system and the ternary material system. Therefore, the ternary lithium battery was temporarily stopped, which had little effect on the production plan of Chaowei.

The ternary lithium battery life is more than a mile

At present, as the two camps of the power battery industry, ternary lithium battery and lithium iron phosphate have different performances. The ternary lithium battery has high energy density, fast charge and discharge speed, but poor stability and safety. The technology of lithium iron phosphate is relatively mature, and the safety performance is relatively prominent, but the energy density is relatively low.

In the initial stage of domestic power battery industrialization, considering the maturity of technology, many companies choose to mass produce lithium iron phosphate batteries. In February last year, the Ministry of Science and Technology released the ?°National Key R&D Plan New Energy Vehicle Key Special Implementation Plan?±, and proposed that the energy density of the car power battery should reach 200Wh/kg by the end of 2015. From the indicators specified therein, the ternary lithium battery is currently the most likely battery system to achieve its goals. The ternary lithium battery industry, bathed in the sunshine of government policy, has also ushered in a rapid development of "spring." Including Tianjin Zhongju, Wanxiang and many other battery companies have reversed the wind direction, invested a lot of funds, equipment, human resources research and development, increased production of ternary lithium batteries. This time the 'pause order' came out, and the "safety" hammered on many enterprises, causing an uproar, and the fate of the ternary lithium battery became erratic.

"Pause order" triggers security dispute

The Ministry of Industry and Information Technology temporarily called the ternary lithium battery, and other types of power batteries such as lithium iron phosphate were not affected. Does this mean that batteries such as lithium iron phosphate are safer than ternary material systems?

Kirk believes that this is not the case. He said that the safety of new energy vehicles and the safety of lithium-ion battery systems depend on a variety of factors, including the cathode material system of lithium-ion batteries, rather than just the cathode material itself. The accident of Shenzhen Wuzhoulong vehicle charging and Xiamen bus fire is not because of the ternary lithium battery, which means that the safety of the monomer material does not represent the safety of the power battery system or the whole vehicle.

Also at the China Electric Vehicles 100-person conference, Professor Ouyang Minggao of the Department of Automotive Engineering at Tsinghua University reported the statistical results of China's new energy vehicle safety accidents. The results show that the accident mainly comes from the short circuit caused by collision, external short circuit caused by battery water ingress, electrical connection failure, overcharge of battery, external short circuit caused by battery leakage.

Previously, some experts said that the safety problem caused by battery materials only accounted for 10% of the problems faced by new energy vehicles, while the safety hazard caused by the battery management system was as high as 40%. "In the entire lithium-ion battery, the battery management system is the weakest link, and it is also the main cause of safety failure." Sun Yanxian, general manager of Chaowei Chuangyuan Lithium Battery, believes that if it is not a problem with the short circuit of the battery system, no matter which positive electrode material is used should all be supported.

Lithium battery research and development should be based on multiple technical routes

The reason why the "suspension order" of the ternary lithium battery has little effect on Chaowei is mainly due to its extremely reasonable layout in the development of the power lithium battery. "Do not be limited to a certain material. The development of lithium batteries should be paralleled by multiple technical routes, which is the development trend of the future power battery industry." Sun Yanxian proposed his own ideas for lithium battery development.

In fact, as early as 2006, Chaowei has started the research and development and production of lithium batteries. Since then, it has been working on the key issues of specific energy and safety of lithium-ion batteries, and insisted on multiple technical routes. Ten years of precipitation, thick and thin hair. In January 2015, "New Energy Vehicle power battery System Innovation Team" led by Dr. Kirk was selected as the first batch of leading innovation teams in Zhejiang Province; in March 2015, Chaowei Group ?s first batch of new energy vehicle power lithium-ion batteries were officially launched. In June 2015, Chaowei Group's ?°Automated Production Demonstration Project for lithium ion battery for 2000MWh Electric Vehicles?± was selected as the only battery project in Zhejiang Province, and was selected as ?°2015 Zhejiang Province Two-in-One Depth Integration Project?±; and the annual output value was 12 billion. Yuan ?s second phase of the new energy vehicle power lithium-ion battery is progressing in an orderly manner and is scheduled to go into production in June, when the total capacity will reach 4 billion watt-hours.

"It is not known whether the ternary lithium battery will be lifted in the future. But it is worth knowing that no matter what kind of technical route is chosen, we must pay attention to the reliability, stability and safety of the power battery in use." Sun Yanxian said Chaowei will focus on the direction of national policy. In the process of R&D and manufacturing of lithium batteries, it will fully realize standardization, intelligence, automation and low cost, and transform and upgrade the four industries, so that the super-power lithium battery industry can be in new energy. The territory of the industry opens up a broader territory.

The page contains the contents of the machine translation.