Research On Green Design Method Of Electric Vehicle Traction Battery

Lithium-ion batteries(LIBs)are currently the preferred power sources of electric vehicles(EVs).As the EV's traction battery,LIB has prominent advantages in technology,cost,and safety.With the large-scale application of lithium-ion traction battery,its resources,energy consumption and environmental pollution will be further highlighted.How to reduce the environmental impact of lithium-ion traction batteries and even the EVs from the perspective of green design and manufacturing has become an essential part of the design and development of lithium-ion traction battery packs.Supported by the project of National Natural Science Foundation of China,this dissertation studies the generation and optimization of the green design scheme of EV traction battery in the context of the replacement design of EV traction battery pack.The main research work is as follows:(1)Based on the analysis of the basic research and development processes of the EV traction battery pack,this dissertation puts forward the overall optimization strategy of green design and a green design architecture of EV traction battery pack,which provides a theoretical basis for conducting specific green design tasks in the design and development stage of the traction battery pack.(2)In terms of green design optimization in the conceptual design stage for a traction battery pack,a new concept named "green design optimization potential" is proposed in the research field of green design.Considering the relationship among green design elements(function,material,geometric structure,connection relationship and manufacturing process),the new design concept is described mathematically.Through the establishment of green design optimization potential assessment tool,the method of generating concept schemes for product green design is proposed.Based on the analysis of function,environmental performance,and cost of traction batteries,the decisionmaking method of the concept design scheme for the traction battery is proposed.(3)To meet the demand of quantitative analysis of environmental impact in the detailed design process of a traction battery pack,the integrated application method of life cycle data for life cycle simulation of a traction battery pack is studied.By using the theory of life cycle analysis(LCA)and product parametric design thinking,the parameterized checklists for production,use,recycling of the traction battery are established after investigating the traction batteries' production process,energy transfer and consumption of pure EV operation,and the recycling processes of waste battery packs.The link between the traction battery product model and its life cycle checklists is established.And the calculation of the entire life cycle environmental impact has been finished in the forward design of the traction battery packs.(4)Due to the missing of a green optimization method in the detailed design of a traction battery pack,the configuration design of the EV traction battery pack is studied.Firstly,LIB performance analysis and calculation are based on the electrochemical principle.Secondly,the detailed design scheme of the traction battery pack is generated by considering the design constraints.Then the optimization design method of a traction battery pack for environmental performance improvement is studied.Finally,all mentioned above form a complete architecture of traction battery environment performance optimization in the detailed design stage.(5)Taking the electric taxi deployed in Beijing,Shanghai,and Shenzhen as an example,the environmental impact of a traction battery pack is analyzed.Under the two scenarios: equal EV driving range with the referred battery pack and increased EV driving range,the proposed green design method of the traction battery is used to obtain two new detailed design schemes.The effectiveness of the proposed method is verified by comparing the new design schemes with the reference one.