A thermal management device and battery pack

Abstract

The application provides a heat management device for heat management of a battery pack stacked with at least two layers of battery cell units, comprising: a liquid cooling assembly comprising a liquid cooling plate, a medium flow channel being provided in the liquid cooling plate for circulation of cooling liquid; wherein, along the stacking direction, the top side and the bottom side of each layer of battery cell units are respectively in abutment with the corresponding liquid cooling plate, and the flow direction of the cooling liquid in the liquid cooling plate on the top side of each layer of battery cell units is opposite to the flow direction of the cooling liquid in the liquid cooling plate on the bottom side. The heat management device provided by the application adopts opposite flow directions for the top and bottom liquid cooling of the same layer, which can avoid the local temperature field bias caused by the cooling liquid always entering or flowing out from the same direction, and make the heat exchange on the upper and lower sides of the single layer of battery cell units more balanced. Meanwhile, the liquid cooling structures of each layer are arranged in the same regularity in turn, which can also make the heat distribution in the whole stacking direction more uniform, thereby effectively solving the problems of local hot spot concentration, large temperature difference between layers and uneven heat dissipation of the whole pack which are prone to occur in the case of stacking of multiple layers of battery cell units.

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