A novel heat transfer device for narrow space was proposed to meet high power battery heat dissipation. Based on the battery heat generation data, the heat transfer enhancement mechanism of the secondary flow pattern is studied. Then establish the general heat transfer correlation for this liquid-cooled structure with a specific aspect ratio. The results show that the channel with rib angle of 90° has higher Nu as well as ƒ and can achieve the same heat transfer performance with smaller flow rate. This is due to its transition flow pattern of twist-tape vortex and stagnant vortex, which can enhance the contact heat transfer performance of mainstream cold fluid while inhibiting the growth of boundary layer. The increase in rib number gradually decreases the gain of Nu with a minimum increment of less than 1%; while ƒ almost gradually increases with a common difference of 0.05. From the perspective of heat transfer and energy saving, increasing rib number does not essentially improve the heat transfer performance. Because the flow field at different rib number is just a mapping of the complete flow field at the corresponding length. Based on the above data, for the flat channel with aspect ratio of 10:3 in narrow space, the second-order general heat transfer correlation for different hydraulic diameter is established considering the Re, dynamic viscosity, rib angle and rib number. Finally, the coefficient of determination (R²) of the correlation is 0.9973, which can provide guidance for battery thermal management engineering applications.

针对大功率电池散热，提出了一种适用于狭小空间的新型传热装置。基于电池发热数据，研究了二次流型的传热强化机理。然后建立这种具有特定纵横比的液冷结构的一般传热关系式。结果表明，肋角为90°的通道具有更高的Nu和ƒ，可以在较小的流量下达到相同的传热性能。这是由于其旋涡和停滞涡的过渡流型，可以增强主流冷流体的接触传热性能，同时抑制边界层的生长。肋条数的增加逐渐降低了Nu的增益最小增量小于 1%；而 ƒ 几乎以 0.05 的共同差异逐渐增加。从传热和节能的角度来看，增加肋数并不能从本质上提高传热性能。因为不同肋数处的流场只是相应长度处完整流场的映射。基于上述数据，对于狭长空间内长径比为10:3的扁平通道，考虑Re、动力粘度、肋角和肋数，建立了不同水力直径下的二阶一般传热关系式。最后，相关性的决定系数（R ²）为0.9973，可为电池热管理工程应用提供指导。