The hottest talk about the echelon utilization of

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Then talk about the echelon utilization of power batteries: from "false proposition" to unstoppable

in the industry, echelon utilization has always been considered as the main destination for the retired power batteries of new energy vehicles. However, some people think that the echelon utilization of power batteries is a "false proposition" from the perspective of safety and economy. However, as the trend of power battery decommissioning in China approaches, and relevant standards are published in succession, the echelon utilization of power batteries will get more support in terms of the scale and policies of decommissioned batteries, and echelon utilization is imperative

from the "national recommended standard" to the "national mandatory standard"

from the perspective of the automotive industry, the larger the scale of the power battery put into application, the more difficult its management is, and the more standardized the specifications and dimensions of the power battery are, the lower the tensile elastic modulus (close to 1.5gpa) of the whole new energy PDS, and the longer the carbon fiber reinforced material can improve the stiffness and strength to a higher value than that of the long glass fiber. Xiao Chengwei, a researcher at the 18th Research Institute of China Electronics Technology Corporation, said recently that at present, mandatory standards for the design specifications of lithium-ion power batteries are being formulated. Xiao Chengwei suggested that when the amount of power batteries put into use reaches a certain scale, the state should issue mandatory standards in terms of safety performance, size and coding system

long before Xiao Chengwei put forward this proposal, that is, on August 4 this year, the details of three national standards for power batteries, gb/t "recycling of automotive power batteries - residual energy detection", gb/t "product specifications and dimensions of power batteries for electric vehicles", and gb/t "coding rules for automotive power batteries", have been officially announced, and the power battery standard, which has been in the vortex of controversy, has finally been settled. These three national standards make it possible to trace the information of power batteries, and the echelon utilization is more safe, orderly and standardized

although not mandatory, these three standards have a profound impact on the battery industry. Santon new energy and other power battery manufacturers have made it clear to battery China that the specifications and dimensions of the new lithium battery production line, cell and pack will be consistent with the national recommended standards. The national recommended standard of power battery has been recognized by more and more power battery enterprises

grand strategy: "power change mode" + echelon utilization

whether new energy vehicle enterprises or power battery enterprises adopt the development strategy of "power change mode", they often incorporate the echelon utilization of power battery into the enterprise grand strategy and regard it as an important link. Liu Shuanghe, deputy general manager of windsail Co., Ltd., once introduced the latest development strategy of windsail at the "2017 'Second International Summit on power battery applications": windsail has decided to implement the "power exchange mode", and the power battery module is designed in a standardized way, Form a complete industrial chain of "power battery standardization module - new energy vehicles - vehicle power exchange operation - module battery echelon Utilization - energy storage system - battery recycling - electrode materials". Liu Shuanghe said that by implementing the "power exchange mode", Fengfan can control the recycling channel of the power battery used for echelon utilization, laying the foundation for the operation of the energy storage system

"Heroes think alike". In addition to Fengfan, BAIC new energy and new energy vehicle enterprises such as chehejia and Weilai automobile are also implementing the "power exchange mode", and incorporating the echelon utilization of power batteries into the company's long-term development strategy

Zheng Gang, general manager of BAIC bjev, said that the key to the power exchange mode is to open up the whole value chain. He believes that only by connecting this value chain can the cost of the entire industrial chain be effectively reduced, from the development and design of the whole vehicle, to the application of the power exchange mechanism, to the operation of the battery pack, to the echelon utilization of the battery, to the final harmless treatment, and then returning the purified battery materials to the battery manufacturers

Che Hejia has built a power battery pack factory in Changzhou, which can handle 200000 18650 cells per day. This pack factory provides conditions for the echelon utilization of retired power batteries in the future. In addition, Weilai automobile regards the development of energy interconnection business based on the echelon utilization of power batteries to energy storage as an important part of its company's development strategy

although there are difficulties in echelon utilization, it is unstoppable.

echelon utilization of power batteries still faces some problems in actual operation, which is inevitable. The development of things always advances in twists and turns. Li Min, general manager of the energy storage division of Zhejiang Chaowei Power Co., Ltd., said that Chaowei's data showed that it was difficult for the discharge rate of echelon batteries to reach more than 0.3C, and there were still limitations in the echelon utilization of power batteries in the field of energy storage. In addition, Li Min believes that the use of echelon battery technology is not recommended for the time being in improving the accuracy of the prediction curve of photovoltaic power generation

Chaowei group has a set of detailed solutions for the echelon utilization of power batteries, and its process is as follows: the price of recycled lithium batteries is about 20% of the price of new batteries. If the design parameters and operation data of recycled lithium power batteries are well preserved and meet the echelon utilization requirements, the company enters the matching parameters of the energy storage system and directly stores them as the matching batteries of the energy storage system

if the design parameters and operation data of the recovered lithium power battery pack are not clear, Chaowei group will test the electrical performance and safety performance. If it meets the requirements of energy storage application, it will directly enter the configuration parameters of the energy storage system and store it as the configuration battery of the energy storage system. If the whole lithium power battery pack does not meet the energy storage requirements, the basic module units will be tested, and those who meet the requirements will be stored as energy storage batteries; Those who do not meet the requirements enter the recycling warehouse

it is understood that AVIC lithium battery, which adopts a frame type low-cost structure design, has been applied to the mobile power system products of the communication base station of the iron tower company, and has been piloted in Luoyang, Henan Province and Meishan, Sichuan Province. In addition, AVIC lithium has invested and built a battery disassembly test line to study the recycling of power batteries, including the industrialization technology of waste power battery recycling, the whole system of universal battery recycling technology, etc. AVIC lithium believes that the solution to the problem of echelon utilization of power batteries should be comprehensively considered at the beginning of lithium battery design

Su Jinran, deputy chief engineer of Tianjin Lishen Battery Co., Ltd., recently analyzed the advantages and disadvantages of 18650 and 21700 batteries from six dimensions: energy density, cost, standardization, automation, technology maturity and echelon utilization. Through comparison, Su Jinran believes that 18650 has less advantages than 21700 in energy density and cost, but 21700 is less than 18650 in technology maturity and echelon utilization. Battery China believes that the time for China to produce 21700 batteries is not long, and the retirement period of 21700 power batteries is still a few years. 213. The accurate measurement range of force value: 2% - 100% of the maximum experimental force, and the use of 700 steps can be further studied and explored

zhengweiwei, chief engineer of Xinwangda Electric Vehicle Battery Co., Ltd., believes that from the perspective of utilization level, the hierarchical utilization of power batteries includes the whole package and module levels. Because the monomer is likely to be damaged in the disassembly process, resulting in uncertain risks, it is not recommended to carry out industrialized reuse at the monomer level

from the introduction of national recommended standards to the formulation of national mandatory standards, the echelon utilization of power batteries is getting more and more powerful support. Now, the hot topic in the industry is not the authenticity of echelon utilization, but how to seamlessly connect the echelon utilization of power batteries with the development of new energy vehicles, and promote the echelon utilization of power batteries. At present, both the hot Internet car manufacturing enterprises and the traditional lead-acid battery manufacturing enterprises regard the echelon utilization of power batteries as an important part of their development strategy, and the echelon utilization of power batteries will move forward all the way in the query of "false proposition"

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