In order to address transient temperature control and energy consumption issues during the charging of lithium-ion batteries in cold environments, a prismatic lithium-ion battery was selected as the research subject. Using Star-CCM+ and Amesim software in combination, a thermal management simulation of the liquid-cooled power battery pack was conducted. The effect of charging the battery pack at different cooling start temperatures, preheating temperatures, and preheating powers was investigated. The results indicate that during the preheating phase, using a 6000W heating element to preheat the battery pack from -30°C to 0°C reduced the charging time by 31.62%. When the average battery temperature reached 40°C, cooling and heat dissipation were initiated, resulting in a 10.19% reduction in charging time.It can provide certain theoretical references for electric vehicle low temperature heating charging control and heat dissipation technology