1. 研究目的与意义（文献综述）

with the rapid development of global technology and society, energy and environmental protection have become the most concerned issues in the 21st century.because of the overexploitation and utilization of oil resources by human beings in the past 200 years, if the oil continues to be extracted and consumed at this rate, the world's oil resources will be exhausted in less than 50 years.therefore, in recent years, many countries have taken the development of new energy vehicles as a very important work.take a look at china,since the launch of the "ten cities per thousand" project in 2009, china's electric vehicle industry has been developing rapidly with the strong support of the chinese government.the production of pure electric vehicles is expected to exceed 2 million in 2020.

however, as the core of electric vehicles, power battery.its performance has a very big impact on electric vehicles.however, in modern society, compared with the recycling and utilization of power batteries, scientists are more concerned about the upper limit of power batteries and how to make power batteries with higher specific energy and faster charging rate, thus ignoring the recycling treatment of retired power batteries.normal automotive power battery, in the normal use of the case, when the battery capacity dropped to the original peak of about 80%, according to international standards, the power of the car will be greatly reduced, leading to the battery retirement.according to the data, by 2020, about 200,000 tons of power batteries will be decommissioned.decommissioning power batteries, if not properly disposed of, will not only cause a lot of waste of resources, but also seriously pollute the ecosystem and the environment.

on august 1, 2018, china implemented the interim provisions on traceability management for the recovery and utilization of new energy automobile power batteries, which means that the new era of cascade recovery and utilization of new energy automobile power batteries has arrived.cascade utilization refers to the continuous use of a product that has already reached the original design life and then restored all or part of its functions through other methods.taking our common automobiles as an example, many urban automobiles are often not dismantled and utilized after they are eliminated, but are transferred to inland areas or remote areas for downgrading transportation, which is echelon utilization.

2. 研究的基本内容与方案

the research content of this paper is mainly about the method of quick residual energy detection and cascade utilization of decommissioned power batteries. by analyzing the advantages and disadvantages of several different methods and methods, the better method is selected.the technical scheme and route of this paper are as follows:

1. the development status of electric vehicles and power batteries in china is analyzed.

2. the annual scrap amount of power batteries in china is obtained through data statistics.

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   3. 研究计划与安排

   Weekly(time)	Job content	Submission(end of phase)
   1-2（weeks 18 and 19 of semester 7）	Todetermine the graduation project topic, and improve the graduation project task book (related parameters), and collect internal and external data	Graduationproject assignment
   3-4（week 1-2 of semster 8）	Plan design.Document search. Complete proposal report	Literature search.Opening report
   5（week 3 of semester 8）	Foreign language translation.Data collection	Foreign language translation
   6（week 4 of semester 8,March 19）	Capstone persentation	PPT of proposal defense.Record sheet of proposal defense
   7～8（week 5-6 of semester 8）	Design calculation.Sketch drawing	Design calculation draft.Sketch
   9～11（week 7-9 of semester 8）	Drawing and compiling design and calculation specifications (thesis)	Drawing,First draft
   12～15（week 10-13 of semester 8）	Designandpaper arrangement.Focus group mid-term inspection	Formal design.Thesis
   Two weeks of graduation practice (weeks 11-12 of semester8)	Off-campus or online internships.Data collection.Completion of internship report	The internship report
   16（week 14 of semester 8）	The student applied for defense.Prepare for defense.Data pack preparation.Examination of qualification for defense.Check again.The teacher reviews drawings and specifications.	Graduation project information kit
   17（week 15 of semester 8）	Participateinthedefense	Reply PPT Gradutation project

   4. 参考文献（12篇以上）

   1. 彭结林.报废动力电池回收预处理方案及技术研究[d].合肥工业大学,2017.

   2. 姚海琳，王昶，黄健柏.epr下我国新能源汽车动力电池回收利用模式研究[j].科技管理研究,2015,18;84-89.

   3. 连湛伟，石欣，克潇，徐鹏.电动汽车充换电站动力电池全寿命周期在线检测管理系统[j].电力系统保护与控制,2014,12;137-142.

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