基于R1233zd的泵驱两相流锂电池散热系统研究

Research on the performance of the heat dissipation system of pump-driven two-phase flow lithium battery based on R1233zd

中文关键词: 两相流  机械泵驱动  锂电池  电池热管理

英文关键词: two-phase flow  mechanical pump drive  lithium battery  battery thermal management

中文摘要:

      随着人们环保意识的提升，车用锂电池得以飞速发展，水冷系统以其简单的系统结构被广泛应用于车用锂电池散热领域。水冷系统利用工质显热换热，不仅换热能力有限，也存在因工质泄露而引发短路、燃烧的安全隐患。泵驱两相流系统散热能力较强且安全，近年来多应用于航空航天领域，但是在车用锂电池散热方面的应用和研究较少，因此本文提出基于R1233zd的泵驱两相流系统替代水冷系统的锂电池散热方案。R1233zd具有无毒、不可燃且绝缘的特性，同时兼具环保性和较高的散热潜力，相比于传统制冷剂R134a，R1233zd具有更低的GWP和更高的潜热。本研究使用实验的方法，在使用相同实验台架且保持环境温度和冷源温度相同的情况下，对比分析热负荷为500W、700W、900W和1100W时，水冷系统和泵驱两相流系统的散热效果。结果表明：1）在相同散热量的情况下，泵驱两相流系统需要更低的流量，本实验中，泵驱两相流系统的流量仅为水冷系统流量的1/7；2）泵驱动两相流系统具有更好的散热效果，本实验中，其冷板温度比水冷系统低2℃到6℃、冷板下表面温差为水冷系统的1/7；3）泵驱两相流系统能够更好地抑制局部热点的蔓延。综上所述，基于R1233zd的泵驱两相流锂电池散热系统具有非常广阔的应用前景。

英文摘要:

      With the improvement of people"s awareness of environmental protection, the rapid development of auto-motive lithium battery, water cooling system with its simple system structure is widely used in the field of vehicle lithium battery heat dissipation. The sensible heat transfer of working medium is used in water cooling system, which not only has limited heat transfer capacity, but also has the potential safety hazard of short circuit and combustion caused by leakage of working medium. In recent years, the pump driven two-phase flow system has strong heat dissipation capacity and safety, and it has been widely used in aero-space field, but the application and research in vehicle lithium battery heat dissipation is less. Therefore, this paper proposes a lithium battery cooling scheme based on R1233zd pump driven two-phase flow sys-tem instead of liquid cooling system. Compared with the traditional refrigerant R134a, R1233zd has lower GWP and higher latent heat. In this study, the cooling effects of liquid cooling system and pump driven two-phase flow system were compared and analyzed when the heat load was 500W, 700W, 900W and 1100W with the same test bench and the same ambient temperature and cold source temperature. The re-sults show that: 1) in the case of the same heat dissipation, the pump driven two-phase flow system needs lower flow rate, in this experiment, the flow rate of the pump driven two-phase flow system is only 1 / 7 of that of the water-cooling system; 2) the pump driven two-phase flow system has better heat dissipation effect, in this experiment, the cold plate temperature is 2℃ to 6℃ lower than that of the water-cooling system, and the temperature difference of the cold plate is 1/7 that of the water-cooling system; 3) the pump driven two-phase flow system has better heat dissipation effect The flooding two-phase flow system can better inhibit the spread of local hot spots. In conclusion, the pump driven two-phase flow lithium battery cooling system based on R1233zd has a very broad application prospect.