In order to maintain the proper operating temperature and avoid thermal runaway propagation of lithium-ion power battery module, this paper proposes a novel hybrid battery thermal management system based on phase change material (PCM) and liquid cooling. In the proposed system, the operating temperature of the battery is maintained mainly by latent heat of PCM. In the case of thermal runaway condition, PCM acts as a heat buffer, and the heat dissipates through the liquid cooling system to avoid the thermal runaway propagation. The heat transfer model and the thermal runaway model are established and then verified. The performance of system is numerically analyzed under extreme operating and thermal abuse conditions. The results show that the proposed system combines the advantages of PCM and liquid thermal management schemes, which can fully meet the heat dissipation demand under extreme operating conditions. The high thermal conductivity of PCM is beneficial to the reduction of battery temperature but may cause thermal runaway propagation. The proposed system also have good heat dissipation capacity in avoiding the thermal runaway by optimizing some parameters, such as thethermal conductivity of PCM and water velocity.

为了维持适当的工作温度并避免锂离子动力电池模块的热失控扩散，本文提出了一种基于相变材料（PCM）和液体冷却的新型混合动力电池热管理系统。在提出的系统中，电池的工作温度主要通过PCM的潜热来维持。在热失控情况下，PCM用作热量缓冲器，热量通过液体冷却系统散发，以避免热失控传播。建立并验证了热传递模型和热失控模型。在极端运行和热滥用条件下，对系统的性能进行了数值分析。结果表明，该系统结合了PCM和液体热管理方案的优点，可以完全满足极端运行条件下的散热需求。PCM的高导热率有利于降低电池温度，但可能导致热失控传播。通过优化一些参数，如PCM的导热系数和水速，所提出的系统在避免热失控方面也具有良好的散热能力。