The Role of Lean in Enhancing In-Plant Logistics Efficiency in EV Assembly Plants

Abstract

The objectives of this study are threefold: (1) to examine the role of Lean principles within the logistics sector; (2) to investigate the factors influencing Electric Vehicle (EV) assembly plants; and (3) to develop guidelines for improving and optimizing logistics efficiency in EV assembly through Lean methodology. This study employed a survey research design. The target population comprised employees at EV assembly plants across three provinces in the Eastern region of Thailand. Data were collected using a structured questionnaire based on a five-point Likert scale. Descriptive statistical techniques, including frequency, percentage, mean, and standard deviation, were utilized to analyze the general characteristics of the respondents and overall satisfaction levels. Inferential statistical analyses, specifically Pearson’s Correlation Coefficient and Multiple Regression Analysis, were applied to examine the relationships between variables and to determine the extent to which identified factors influence the role of Lean. The findings indicate that the overall level of Lean implementation in the EV industry is high. Lead time, cycle time (Takt time), and spare parts inventory levels were found to be the most significant factors influencing the role of Lean, followed by the reduction of processes or steps within the EV assembly line. Furthermore, a majority of respondents emphasized the critical importance of spare parts inventory management in EV assembly. These results provide valuable insights to support administrative decision-making and strategic planning aimed at enhancing quality and optimizing efficiency in the electric vehicle assembly process.