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锂离子电池温升特性分析及液冷结构设计

盘朝奉 刘兵 陈龙 何志刚 韩超

盘朝奉, 刘兵, 陈龙, 何志刚, 韩超. 锂离子电池温升特性分析及液冷结构设计[J]. 西南交通大学学报, 2020, 55(1): 68-75. doi: 10.3969/j.issn.0258-2724.20180241
引用本文: 盘朝奉, 刘兵, 陈龙, 何志刚, 韩超. 锂离子电池温升特性分析及液冷结构设计[J]. 西南交通大学学报, 2020, 55(1): 68-75. doi: 10.3969/j.issn.0258-2724.20180241
PAN Chaofeng, LIU Bing, CHEN Long, HE Zhigang, HAN Chao. Temperature Rise Characteristic Analysis and Liquid Cooling Structure Design of Lithium Battery[J]. Journal of Southwest Jiaotong University, 2020, 55(1): 68-75. doi: 10.3969/j.issn.0258-2724.20180241
Citation: PAN Chaofeng, LIU Bing, CHEN Long, HE Zhigang, HAN Chao. Temperature Rise Characteristic Analysis and Liquid Cooling Structure Design of Lithium Battery[J]. Journal of Southwest Jiaotong University, 2020, 55(1): 68-75. doi: 10.3969/j.issn.0258-2724.20180241

锂离子电池温升特性分析及液冷结构设计

doi: 10.3969/j.issn.0258-2724.20180241
基金项目: 国家自然科学基金(51707084,51475213);江苏省自然科学基金(BK20171300,BK20160529);江苏省重点研发计划项目(BE2017096)
详细信息
    作者简介:

    盘朝奉(1979—),男,博士,教授,研究方向为电动汽车系统技术集成与应用、电动汽车动力电池热管理技术,E-mail:chfpan@ujs.edu.cn

  • 中图分类号: U469.72

Temperature Rise Characteristic Analysis and Liquid Cooling Structure Design of Lithium Battery

  • 摘要: 针对电动汽车动力电池的温升发热导致温度分布不均及过热现象,根据电池的热物性参数及不同环境温度下的内阻,建立电池包生热分析模型;测试采集并拟合电动汽车的母线电流,通过仿真分析得到不同车速下电动汽车电池包的温升情况;进行典型城市工况实车试验,测取不同车速下电池包内温度测点的温升数据并拟合成温升曲线,通过仿真与试验结果对比,验证所建立的热分析模型的准确性;在此基础上,设计双进双出的液冷散热管道结构方案,分析在1C放电倍率下该液冷散热方案的散热效果. 研究结果表明:锂电池在高温(50 ℃)下,内阻仅为13.9 mΩ,而在低温(−30 ℃)时,内阻却达到了21.5 mΩ;电动汽车在新欧洲行驶工况(NEDC工况)和匀速工况(40、50、60、70 km/h)下的最高温升分别为1.8、2.6、3.6、5.3、8.0 ℃;所设计的U型结构液冷管道可以有效地降低电池包温升,提高电池包的温度均匀度.

     

  • 图 1  温度-内阻拟合曲线

    Figure 1.  Fitting curve of temperature-internal resistance

    图 2  电池包安装位置和电池模组网格

    Figure 2.  Install position of battery and module grid

    不同车速下瞬时电流拟合曲线

    Instantaneous current at different speeds

    图 3  NEDC瞬时电流曲线

    Figure 3.  Instantaneous current at NEDC

    图 5  NEDC工况温升云图

    Figure 5.  Nephogram of temperature rise at NEDC

    图 6  40 km/h匀速行驶温升云图

    Figure 6.  Nephogram of temperature rise at 40 km/h

    图 7  匀速行驶模组温升云图(z = 65 mm)

    Figure 7.  Temperature rise of module at constant speed of 50 km/h and 60 km/h (z = 65 mm)

    图 8  70 km/h匀速行驶温升云图

    Figure 8.  Nephogram of temperature rise at constant speed of 70 km/h

    图 9  温度传感器位置

    Figure 9.  Locations of temperature sensors

    试验与仿真温升对比(NEDC与匀速行驶)

    Temperature rise comparison of experiment and simulation (NEDC and constant speed)

    图 11  电池包内部模组及管道网格

    Figure 11.  Grids of internal module and pipeline in battery

    图 12  模组温升云图(未采用和采用液冷散热)

    Figure 12.  Temperature rise nephogram of module (unused and used liquid cooling pipe)

    图 13  两种方式电池包内平均温度对比

    Figure 13.  Comparison of average temperature in cooled and uncooled batteries

    表  1  电池PACK各组件具体参数

    Table  1.   Specific parameters of each component of battery PACK

    材料导热系数/
    (W•(m•K)−1
    比热容/
    (J•(kg•K)−1
    密度/
    (kg•m−3
    电池 1.24/1.24/0.62 840 2 260
    空气 0.024 2 1 026 1.23
    电池箱 16.27 503 8 025
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出版历程
  • 收稿日期:  2018-05-07
  • 修回日期:  2019-02-25
  • 网络出版日期:  2019-04-04
  • 刊出日期:  2020-02-01

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