| 摘要: |
| 动力电池使用制冷剂直接冷却具有成本低,冷却效率高、重量轻,安全性高等优点,但存在蒸发温度过低和电池冷却温度不均的问题。本文通过实验研究了直冷板后二次节流对直冷板温度调节的有效性。结果表明:在直冷板后接人降压装置(固定节流孔装置或可调节开度压力调节阀)可以改变直冷板的出口压力,减小直冷板出口过热度,从而提升直冷板的蒸发温度,并改善制冷剂直冷方式的均温性;但固定开度的降压装置无法主动调节直冷板出口压力,直冷板出口压力随着热负荷增加而增加,因此在热负荷变化时较难将电池温度控制在合适的范围;而可变开度的降压装置可根据电池的运行热负荷将直冷板的蒸发压力调整到合适的目标值,既能避免直冷板的蒸发温度过低,又能改善直冷板的均温性,以取得较佳的电池冷却效果。 |
| 关键词: 电动汽车 动力电池 制冷剂直接冷却 降压装置 |
| DOI： |
| 投稿时间：2020-09-13 修订日期：2020-11-29
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| 基金项目: |
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| Influence of Throttling Device on Refrigerant Direct Cooling System forPower Battery of Electric Vehicle |
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Zhang Rongrong, Zou Jiang, Sun Xiangli, Chen Juan, Guo Yao, Ren Bin
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| (Zhejiang Sanhua Automotive Components Co.，Ltd.) |
| Abstract: |
| Direct refrigerant cooling has the advantages of low cost, high cooling efficiency, low weight, and high safety, and also problems of low evaporating temperature and uneven battery temperature in normal direct cooling refrigerant systems. In this study, the effectiveness of secondary throttling on the temperature regulation of a direct cooling plate was tested and verified. The results show that the direct cooling plate outlet pressure is increased while the superheat is reduced by adding a throttling device (fixed orifice device or a pressure-regulating valve with adjustable orifice) behind the cooling plate, thereby increasing the evaporation temperature and leading to better temperature uniformity. However, the throttle device with a fixed aperture cannot actively adjust the outlet pressure of the direct cooling plate, which increases as the thermal load increases. Therefore, it is difficult to control the battery temperature within an appropriate range when the thermal load changes. The throttle device with an adjustable aperture can adjust the direct cooling plate outlet pressure to a target value according to the operation load of the battery, which can not only avoid the evaporation temperature from being too low, but also improve the temperature uniformity. |
| Key words: electric vehicle power battery refrigerant direct cooling throttling device |
