| With the continuous rise of the new energy industry,the retirement and subsequent treatment of power batteries has become a major issue for enterprises and society.Power battery recycling is facing the problem of secondary utilization,which has led to the recycling and secondary utilization of retired power batteries receiving continuous attention in theory and practice.Inventory,as a key link between power battery production and recycling in the closed-loop supply chain,is a short board in the development of new energy power battery industry.How to solve the impact of power battery recycling and secondary use behavior on its production batch,recycling batch and repair batch and other inventory decisions is the focus of this paper.In this paper,we simplify the structure of the closed-loop supply chain to highlight the optimal inventory decisions in the secondary utilization of retired power batteries,i.e.,in a closed-loop supply chain composed of a single manufacturer and a single retailer,we assign production and repair functions to the manufacturer and partial repair functions to the retailer through the MR recycling channel,and investigate the optimal inventory decisions of this closed-loop power battery supply chain inventory system.First,this paper provides two ladder utilization levels for the recycling of retired power batteries,low-speed power applications and energy storage applications,and combines the production and repair behaviors of power battery manufacturers,while considering the carbon emission factors and service levels of the closed-loop power battery supply chain inventory system in the context of mixed recycling,and constructs an inventory optimization model with the objective of minimizing the total joint inventory cost.Secondly,this paper takes CATL,which integrates manufacturing and recycling,as the background of the model calculation,to test and solve the inventory optimization model,and makes a preliminary verification of the inventory optimization model by particle swarm algorithm.Finally,a sensitivity analysis of the relevant parameters of the inventory optimization model is conducted to further verify the stability of the inventory optimization model of the closed-loop power battery supply chain in the context of mixed recycling.The research results show that:(1)the power battery closed-loop supply chain inventory system has the smallest total joint inventory cost when the manufacturer controls the vast majority of the recycling business under the MR recycling channel,and the retailer is not suitable to be responsible for the repair of retired power batteries;(2)When the joint business volume of power cells reaches a certain level,variations in the recycling unit price,quality level and carbon tax,which are much smaller in order of magnitude than the production volume,have no significant impact on the optimal decision of inventory in the closed-loop supply chain within a very small range;(3)After the power battery business forms a certain scale effect,there is a positive relationship between the manufacturer’s power battery production lot and the total joint inventory cost,and there is a negative relationship between the low-speed power application lot and the energy storage application lot in the secondary utilization and the total joint inventory cost,that is,the recycling of retired power batteries for secondary utilization can effectively reduce the system inventory cost of the closedloop supply chain. |
