储能科学与技术 ›› 2021, Vol. 10 ›› Issue (1): 210-217.doi: 10.19799/j.cnki.2095-4239.2020.0206

• 储能测试与评价 • 上一篇    下一篇

石墨-石蜡复合相变材料的圆柱型动力电池组热管理性能

王海民1,2(), 王寓非1, 胡峰1   

  1. 1.上海理工大学 能源与动力工程学院
    2.上海市动力工程多相流动与传热重点实验室,上海 200093
  • 收稿日期:2020-06-09 修回日期:2020-06-29 出版日期:2021-01-05 发布日期:2021-01-08
  • 作者简介:信人:王海民(1971—),男,博士,教授,主要研究方向为动力电池热电特性测试评价,E-mail:hmwang@usst.edu.cn
  • 基金资助:
    国家重点研发计划项目(2018YFB0104400)

Thermal management performance of cylindrical power batteries made of graphite paraffin composite phase change materials

Haimin WANG1,2(), Yufei WANG1, Feng HU1   

  1. 1.School of Energy and Power Engineering, University of Shanghai for Science and Technology
    2.Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, China
  • Received:2020-06-09 Revised:2020-06-29 Online:2021-01-05 Published:2021-01-08

摘要:

本工作以21700容量型NCM811锂离子动力电池为研究对象,设计了正六边形布置的电池模组,外覆圆柱型石墨-石蜡复合相变材料的结构。利用数值模拟方法探究了不同恒定倍率放电,以及相邻两电池不同间距对模组热特性的影响。结果表明,对于不同倍率,相邻电池间距对电池模组高倍率放电过程中的温度影响要远大于低倍率放电过程,而对于相同倍率,小间距模组从放电开始至结束的温升要高于中间距和大间距模组。电池温度的变化相对于热流量在时间上有一定滞后,通过监测热流量的数值,能够对电池热管理的失效做出提前预知,提高电池组的安全性。

关键词: 圆柱型动力电池组, 石墨-石蜡复合相变材料, 热特性

Abstract:

A hexagonal cell module was designed based on the 21700 capacity NCM811 lithium-ion cell, and a cylindrical structure of graphite paraffin composite phase change material was used to cover the battery. The thermal characteristics of the module was investigated using numerical simulations by varying the discharge rate and distance between two adjacent batteries. The results show that the distance between adjacent batteries has a greater influence on the battery temperature for a high rate discharge process compared to a low rate discharge process. At a fixed discharge rate, the temperature rise of the small distance battery modules is higher than that of the middle distance and large distance battery modules. The change of battery temperature lags behind the thermal flow in time. By monitoring the thermal flow, the failure of battery thermal management can be predicted in advance to improve the safety of batteries.

Key words: cylindrical power battery module, graphite paraffin composite phase change material, thermal characteristics

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