• A liquid cold plate with honeycomb-like channels was proposed. • Studied the effects of structural parameters for thermal management. • Studied the effects of inlet velocity on heat dissipation performance. • Improved the battery module temperature gradient. In previous studies, researchers have been working to find a way to increase the heat exchange area of the flow channels in the liquid cooling plate (LCP), to improve the heat dissipation performance of the LCP. In this paper, an LCP with a honeycomb structure (HLCP) is designed based on prismatic batteries. The dense honeycomb channels significantly increase the heat exchange area of the cooling channels. Taking the structural parameters of HLCP and the coolant flow velocity as variables, corresponding models are established for numerical simulation. The results show that the optimal structural parameters are: the width of the cooling channel is 3mm, and the vertical distance from the center of the regular hexagonal aluminum block to its side length is 6.8mm. When the inlet velocity is set to 0.1 m/s and the thickness of HLCP is 3mm, the maximum temperature and maximum temperature difference of the battery are 302.5K, 4.1K, respectively. And the pressure drop in a single HLCP is 122.4 Pa. When the inlet velocity exceeds 0.3 m/s, the improvement in cooling performance is not significant. In addition, the temperature uniformity of the battery module can be improved by adopting a scheme in which the coolant flows in opposite directions in two adjacent HLCPs.