As the main form of energy storage for new energy automobile, the performance of lithium-ion battery directly restricts the power, economy, and safety of new energy automobile. The heat-related problem of the battery is a key factor in determining its performance, safety, longevity, and cost. In this paper, parallel liquid cooling battery thermal management system with different flow path is designed through changing the position of the coolant inlet and outlet, and the influence of flow path on heat dissipation performance of battery thermal management system is studied. The results and analysis show that when the inlet and the outlet are located in the middle of the first collecting main and the second collecting main, respectively; system can achieve best heat dissipation performance, the highest temperature decrease by 0.49 C, while the maximum temperature difference of system decreases by 0.52 C compared with typical Z-type BTMS under the discharge rate of 1 C. Then an optimization strategy is put forward to improve cooling efficiency compared with single-inlet and single-outlet symmetrical liquid cooling BTMS; the highest temperature of three-inlet and three-outlet is 27.98 C while the maximum temperature difference of three-inlet and three-outlet is 2.69 C, decrease by 0.7 and 0.67 C, respectively. K E Y W O R D Sflow path, heat dissipation performance, optimization strategy, parallel liquid cooling plate, thermal management system

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A thermal management system (TMS) including heat pipes, heat-conducting glue, phase change materials (PCM), and micro-channel plates is built in this research. The heat pipes and heat-conducting glue can solve the problem of poor thermal conductivity and large internal temperature difference (T d) of TMS including PCM and liquid cooling. The micro-channel plates can solve the problem that TMS combined with the PCM and the heat pipes is difficult to transfer heat. The designed TMS can cool and heat li-ion battery. Through the li-ion battery discharge test experiment by 1C, 2C, and 3C, the li-ion battery heating power is obtained. The temperature change curve of li-ion batteries at 1C, 2C, 3C discharge and when ambient temperature (T a) is −20 C, −10 C, 0 C, and 20 C are studied. When the T a is lower than 0 C, the designed TMS can heat the li-ion battery to 20 C, and make the T d inside the li-ion batteries approach 0 C within a short period.

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