The liquid cooling plate is an important part of the active liquid cooling system of the battery module

The goal of power battery thermal management is not only to ensure that the battery module works within the appropriate temperature range, but also to ensure that the internal temperature of the module is uniform as far as possible. The liquid cooling plate is an important part of the active liquid cooling system of the battery module. Previous research on battery thermal management mostly focused on the influence of the flow channel structure of the liquid cooling plate and the arrangement of the cold plate on the temperature distribution of the battery module, while ignoring the influence of the temperature rise along the coolant on the temperature uniformity of the module. According to the principle of inter wall heat transfer, a nonlinear heat transfer enhancement method on the liquid cooling side is proposed to achieve uniform temperature distribution on the wall surface of the heat source. Taking the heat dissipation requirement of a power battery module as an example, a model of nonlinear heat transfer enhancement liquid cooling homogenizing plate was built, and the corresponding numerical simulation was carried out. The results show that the proposed temperature equalizing liquid cooling plate can effectively meet the temperature equalizing requirements of power battery modules.

With the increase of power battery energy density, air cooling has been difficult to meet the battery thermal management requirements. Because of its compact structure, the liquid cooling plate can separate the liquid from the battery, thus enhancing the safety of the battery system. In recent years, it has become an important part of the active liquid cooling system. In the design of liquid cooled panels for automotive battery packs, different applications may require different channel designs and geometric shapes. At present, most researches on liquid cooled panels are based on the rectangular channel geometry, as well as the influence of parameters such as the layout and flow of liquid cooled panels on the temperature distribution of battery modules, while ignoring the influence of temperature changes along the coolant on the temperature uniformity of modules.

As we all know, with the heat transfer between the battery and the liquid cooling plate, the temperature of the coolant increases gradually along the way. In order to meet the thermal management requirements of the power battery, on the one hand, sufficient coolant flow should be used to bring the battery out of the heating zone and ensure that the battery works within the appropriate temperature range. On the other hand, the complex coolant flow channel structure is designed to ensure the temperature uniformity of the battery module. The increase of flow is not conducive to the lightweight design requirements of the thermal management system, and the complex runner design increases the manufacturing cost and operating power consumption of the system.