Research On Environmental Benefits Of Power Battery Based On Life Cycle Assessment

With increasing awareness of the environmental problems and negative impact of fossil fuel,renewable energy-based vehicles,e,g.,electric vehicles attract more and more attention all over the world.The power batteries as a core component of electric vehicles play a vital role in the related industry.China as a maj or producer of power battery faces ever-greater challenges in natural resources,energy,and environment.Carrying out the life cycle assessment(LCA)of power batteries is important to assure the sustainable development of our economic.However,at present,the assessment is still at its preliminary stage,with various deficiencies,such as incomplete evaluation scope,lack of inventory data and relevant software,and misinterpretation of results.This make it hard for the government to publish related regulation,policies,and standards,which seriously hinder the sustainable development of power battery manufacturers.Therefore,based on the life cycle impact assesement(LCIA)framework and current Chinese environmental status,this thesis evaluate the resource exhaustion and environmental benefits of the power battery in its entire life cycle(from cradle to reuse).Based on the in-depth study of the LCA theory,this thesis establishes a LCA model for electromechanical products,and develops a LCA software using C and Matlab with the life cycle inventory(LCI)database compiled by ExcelAccording to the national pollutant emission data and related policies,the environmental impact of power battery corrected by its cost was developed using the target to distance methodas well as a set of LCIA method suitable for China's national conditions.Two types of power batteries,lithium iron phosphate(LFP)battery and lithium nickel cobalt manganese oxide(NCM),were picked as testing objects.According to the production process,the inventory data of various life cycle stages of the power battery was collected.The model it is used to evaluate of the resource depletion and environmental impact.The results show that the environmental impact and fossil fuel usage of LFP are larger than those of NCM,except for the depletion of mineral resources.The sensitivity analysis is carried out using the main impact indicators(charging and discharging efficiency,electric power structure,cycle number)to identify key factors,and corresponding suggestions and measures are proposed to improve the performance of related batteries.