A Study of Variable Cell Spacings to the Heat Transfer Efficiency of Air-Cooling Battery Thermal Management System

The air-cooling battery thermal management system has been widely adopted as the device for power accumulators on electric vehicles nowadays. To improve heat transfer coefficient with minimum rise in cost, this study modified conventional rectangular cell arrangements 21,700 cylindrical packs two approaches: 1. increase vertical spacings; 2. convert constant spacings to gradient spacings. results show that smaller are beneficial overall cooling performances of designs at almost all flow rates. spacing design larger could deliver better temperature uniformity, while one suppress maximum more efficiently higher However, total pack volume Design 7 (the largest design) is 7.5% than design.