Power cell "ladder utilization" has become a high-frequency vocabulary

By 2017, China had promoted more than 1.8 million new energy vehicles, and the energy density of power cells was twice as high as in 2012. The price per kilowatt-hour dropped by more than 70 kWh. According to the data, China's domestic recycling of automotive power cells is expected to reach 257,000 tons in 2020 and 422,000 tons in 2022.

Recently, the "2018 First China New Energy power battery and Storage Industry Conference" with the theme of "New Energy Conversion and High-Quality Development" was held in Taizhou, Jiangsu Province. With the rapid development of new energy vehicles, the battery retirement of power in China will gradually become a scale. After the car power battery is retired, it is necessary to consider its echelon utilization and recycling. Experts from the industry have raised the issue of power battery recycling, in which "echelon utilization" becomes a high-frequency vocabulary.

So, how does power cell cascade use work? Where exactly are the decommissioned power cells going?

Liuyanlong, Secretary General of the China Chemical and Physical Power Industry Association, said that after the power battery is retired from electric vehicles, there is still 80 capacity to use, so it is necessary to attach great importance to the use of power batteries.

Liuyanlong emphasized that in order to carry out echelon utilization, we must first understand the quality and safety performance of retired batteries. Battery enterprises should establish a large data tracking system platform, and test and evaluate battery methods. Big data should include the production data developed by the power unit, the battery package development and production data, and the battery package in-vehicle operation monitoring data. The health evaluation of the retired battery is conducted through large data to determine whether the battery can enter the ladder utilization market.

In addition, there is a need to focus on the standardization of battery monomers and battery packs, and the introduction of individual batteries of as few specifications as possible within an enterprise can increase the level of automation of production to reduce costs and improve product consistency, while facilitating the dismantling and reorganization of future echelons. Therefore, in the power cell design phase, it is necessary to prepare for subsequent echelon utilization and dismantling recovery.

Of course, not all power cells are suitable for echelon use. Wuhui, research director of the Ivy Economic Research Institute, pointed out that the ternary power battery contains rare metals such as nickel, cobalt, and manganese, and extracts lithium, cobalt, nickel, manganese, copper, aluminum, graphite, diaphragm and other materials through dismantling., Can achieve an economic return of about 42.9 million yuan per ton, thus achieving economic feasibility. However, lithium iron phosphate batteries can only achieve an economic return of approximately RMB 0.93 million per ton through scrapping and dismantling, and it is difficult to cover their recovery costs. Therefore, lithium iron phosphate power cells are more suitable for echelon use.

So where are the batteries used after the echelon? "After recycling from retired batteries, we applied it to the energy storage field. After terracing, the battery will eventually be taken back for dismantling, recycling, using automated technology for physical sorting, and eventually returning to raw materials. Zhangchunyu, director of the second division of the BYD Battery Group, pointed out that at this stage, BYD is taking the example of a comprehensive recovery of lithium iron phosphate, tertiary materials, and our negative electrode materials. At present, the feasibility study has been completed and there is a certain scale recycling production line.

The operating mode of power battery echelon utilization is a problem that is constantly explored in the industry. At this conference, the head of a power battery company said that the construction of a storage power station, or continue to use low-speed electric vehicles, may be the feasible direction of power battery echelon utilization. "At present, whether it is a large energy storage system or a small energy storage system, the overall use of power cell terraces will be more used in terms of energy storage. " he said.

It is understood that starting in 2015, BYD has cooperated with other companies to build energy storage power stations. "In Wuxi, for example, we combined the charging piles of new energy vehicles and built a charging system like a power storage station. Nowadays, the charging stations are directly" hanging "on the electric network, so we all charge more frequently during the day, and the charging cost will be higher. And our charging base can reduce the charging price by "cutting the peak filling". "Zhangchunyu stressed that in the future, BYD will also cooperate in the layout of the power battery recycling industry to join hands in recycling companies and do a good job of power battery recycling.

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