Study on battery direct-cooling coupled with air conditioner novel system and control method

The complex coupling between the direct-cooling battery thermal management system and the vehicle air conditioner system affects its application. This paper designs a dual-VOVs (Variable Opening Valves) system. The temperature control decoupling of the battery and cabin is achieved by regulating the VOVs to change the evaporating pressure of the battery cooling plate and the air conditioner evaporator. Based on the established numerical model, focusing on specific regulating action and the three main control quantities of the system, the regulating logic during system operating conditions changing and the influence of different synergies on system performance are investigated. To cope with the significant lag in temperature control caused by the addition of VOVs and to achieve precise temperature control, Estimation-feedback control method is proposed. The results show that for both battery and cabin, the Estimation-feedback control method has a good temperature control performance and ensures good energy characteristics. This paper discusses the application issues of direct-cooling battery thermal management systems coupled with air conditioner.