The temperature control technology based on phase change material (PCM) demonstrates excellent performance in the field of battery thermal management. However, the compact and bulky structure of the traditional composite PCM (CPCM) module reduces the energy density of the battery pack greatly, and is unfavorable to the secondary heat dissipation. In this work, we develop a novel PCM cooling structure by substituting the common block-shaped CPCM (B-CPCM) module with serpentine CPCM (S-CPCM) plates. The S-CPCM plates with high shape stability provide a much larger surface area and many air flow channels in comparison to the B-CPCM module, thus endowing the module with outstanding secondary heat dissipation capability. For example, under the same fan power of forced air convection (5.2 W), the S-CPCM module delivers a much lower maximum temperature than the B-CPCM module (51.9 vs. 54.2 °C) during the repeated charge-discharge process. As highlighted here, on the basis of guaranteeing the cooling performance, the S-CPCM cooling structure also saves ~70% of the CPCM amount, and thereby the energy density of the battery module is increased by 13.8 Wh kg⁻¹.

基于相变材料（PCM）的温度控制技术在电池热管理领域表现出出色的性能。然而，传统复合PCM（CPCM）模块的紧凑且庞大的结构大大降低了电池组的能量密度，并且不利于二次散热。在这项工作中，我们用蛇形CPCM（S-CPCM）板代替了普通的块状CPCM（B-CPCM）模块，从而开发了一种新颖的PCM冷却结构。与B-CPCM模块相比，具有高形状稳定性的S-CPCM板提供了更大的表面积和许多气流通道，从而使模块具有出色的二次散热能力。例如，在相同的强制对流风扇功率（5.2 W）下，在反复的充放电过程中，S-CPCM模块提供的最高温度比B-CPCM模块低得多（51.9 vs. 54.2°C）。如此处突出显示的那样，在保证冷却性能的基础上，S-CPCM冷却结构还节省了约70％的CPCM量，从而使电池模块的能量密度增加了13.8 Wh kg^-1。