LCA-Based Carbon Footprint Analysis And Assessment Of Automotive Power Batteries

The power battery is the core component of new energy vehicles and plays a very important role in the production line.Therefore,the development of Life Cycle Assessment(LCA)for power batteries is of great significance to the construction of China’s ecological environment.However,research in this field is still in its infancy,and there are problems such as incomplete energy and material consumption statistics,lack of relevant specialised software,unclear interpretation of results,and inaccurate assessment of carbon benefits,which lead to a lack of basis for national departments to formulate environmental policies and establish environmental carbon emission standards for power batteries,and seriously hinder the sustainable development of power battery enterprises.Based on this,this paper takes power batteries as the research object,focuses on the problem of inaccurate carbon footprint assessment,and carries out a Life Cycle Impact Assessment(LCIA)study based on the current environmental situation in China from the aspect of environmental impact,using LCA theory to analyse in depth the resources and environmental benefits of the whole life cycle process of power batteries(from the cradle to the factory gate).The main contents of the study are as follows.(1)To address the problem of imperfect energy and material consumption statistics,this paper selects lithium iron phosphate batteries as the research object,determines the system boundary as the raw material acquisition stage,production stage and use stage,conducts inventory analysis through enterprise data research on Dalian Zhongbi Power Battery Co.,Ltd,establishes the life cycle evaluation model,and calculates carbon emissions by combining with e Footprint software.A sensitivity analysis was conducted based on the main impact indicators of the evaluation results to further identify the key factors or links in LCA that affect environmental benefits.(2)To address the lack of objectivity in carbon footprint assessment,this paper introduces the concept of carbon efficiency,analyses the factors influencing the carbon efficiency of power batteries in the three stages of raw material acquisition,manufacturing and use respectively from the three aspects of carbon emission,cost and processing time,and completes the cost quantification of the life cycle of battery products with examples to establish a more complete LCA-based carbon efficiency evaluation system for power batteries.A more complete LCA-based power battery carbon efficiency evaluation system is established,involving three secondary target level evaluation indicators: carbon emissions,cost and processing time of power batteries.(3)In order to realize the carbon efficiency evaluation of power battery,this paper establishes the carbon efficiency evaluation method based on LCA for automotive power battery.Firstly,based on the AHP-CRITIC combination assignment method,the combination weights are determined by constructing fuzzy judgment matrix and standardized processing,and subsequently,the carbon efficiency evaluation result index is determined according to the normal fuzzy number method by constructing standard evaluation matrix and composite evaluation matrix,and finally the comprehensive affiliation degree is determined to determine the carbon efficiency evaluation grade of automotive power battery based on LCA.