A PCS and battery cluster integrated energy-saving liquid cooling control method and system

Abstract

The present invention discloses a PCS and battery cluster integrated energy-saving liquid cooling control method and system, which determines whether the PCS liquid cooling refrigeration condition is satisfied. If it is satisfied, the outlet of the battery cluster liquid cooling device is connected to the inlet of the PCS liquid cooling device, the outlet of the PCS liquid cooling device is connected to the inlet of the water-cooled unit, the connection between the outlet of the battery cluster liquid cooling device and the inlet of the water-cooled unit is disconnected, and the PCS battery cluster integrated cooling control strategy is executed; otherwise, the three-way valve is controlled to disconnect the connection between the outlet of the battery cluster liquid cooling device and the inlet of the PCS liquid cooling device, disconnect the connection between the outlet of the PCS liquid cooling device and the inlet of the water-cooled unit, connect the outlet of the battery cluster liquid cooling device and the inlet of the water-cooled unit, and execute the battery cluster cooling control strategy. When the condition is satisfied, the PCS liquid cooling equipment is connected to the liquid cooling system to achieve integrated liquid cooling of the PCS and the battery cluster, and when the condition is not satisfied, the PCS liquid cooling equipment is cut out of the liquid cooling system to achieve energy saving and power saving.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and particularly relates to an integrated energy-saving liquid cooling control method and system for a PCS and a battery cluster. Background Art

[0002] In the trend of large-capacity energy storage systems and high-rate batteries, it has become increasingly important for the thermal management system related to energy storage to control the overall temperature of the battery cells within an appropriate range. The thermal management system provides functions such as heat dissipation for the energy storage battery cells through coolant or air, ensuring the safe and reliable operation of the energy storage system and extending the working life of the energy storage battery.

[0003] Currently, in the integrated energy storage container system, the application technology with liquid cooling as the cooling method has been widely promoted. It has the advantages of smaller single-body temperature difference, higher heat dissipation efficiency, and better cooling uniformity. However, in the current liquid cooling system, mainly a water-cooled unit is used to provide a cold source or a heat source to meet the refrigeration or heating requirements of the battery cells. Since the PTC (Positive Temperature Coefficient) has a large power consumption during the heating process of the water-cooled unit, the power consumption of the water-cooled unit is large, and the operating cost is high, failing to achieve the technical goal of energy conservation and consumption reduction; most of the heat dissipation methods of the PCS (Power Conversion System) in the energy storage system are air cooling, and its cooling efficiency is low. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide an integrated energy-saving liquid cooling control method and system for a PCS and a battery cluster, realizing integrated energy-saving liquid cooling of the PCS device and the battery cluster, thereby improving the cooling efficiency and reducing energy consumption.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is:

[0006] An integrated energy-saving liquid cooling control method for a PCS and a battery cluster, comprising:

[0007] Judging whether it satisfies that the ambient temperature is ≥ 0 °C and ≤ 45 °C and the PCS temperature is ≥ 80 °C. If it is satisfied, connect the liquid outlet of the battery cluster liquid cooling device to the liquid inlet of the PCS liquid cooling device, connect the liquid outlet of the PCS liquid cooling device to the liquid inlet of the water-cooled unit, disconnect the connection between the liquid outlet of the battery cluster liquid cooling device and the liquid inlet of the water-cooled unit, and execute the integrated cooling control strategy for the PCS and the battery cluster;

[0008] Otherwise, control the three-way valve to disconnect the connection between the liquid outlet of the battery cluster liquid cooling device and the liquid inlet of the PCS liquid cooling device, disconnect the connection between the liquid outlet of the PCS liquid cooling device and the liquid inlet of the water cooling unit, connect the liquid outlet of the battery cluster liquid cooling device and the liquid inlet of the water cooling unit, and execute the battery cluster cooling control strategy.

[0009] To solve the above technical problems, another technical solution adopted by the present invention is:

[0010] A PCS and battery cluster integrated energy-saving liquid cooling system includes a PCS and battery cluster integrated energy-saving liquid cooling terminal, a first three-way valve, a second three-way valve, a PCS liquid cooling device, a water cooling unit, and a battery cluster liquid cooling device. The liquid inlet of the water cooling unit is connected to the first interface of the second three-way valve, the liquid outlet of the water cooling unit is connected to the liquid inlet of the battery cluster liquid cooling device, the liquid outlet of the battery cluster liquid cooling device is connected to the first end of the first three-way valve, the second end of the first three-way valve is connected to the second end of the second three-way valve, the third end of the first three-way valve is connected to the liquid inlet of the PCS liquid cooling device, and the liquid outlet of the PCS liquid cooling device is connected to the third end of the second three-way valve;

[0011] The liquid inlet and outlet of the water cooling unit are provided with temperature sensors. The PCS and battery cluster integrated energy-saving liquid cooling terminal is electrically connected to the first three-way valve, the second three-way valve, the temperature sensors at the liquid inlet and outlet of the water cooling unit, and each device in the water cooling unit;

[0012] The PCS and battery cluster integrated energy-saving liquid cooling terminal includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the above-mentioned method is implemented.

[0013] The beneficial effect of the present invention is as follows: A PCS and battery cluster integrated energy-saving liquid cooling control method and system, when the conditions are met, connect the PCS liquid cooling device to the liquid cooling system to achieve integrated liquid cooling of the PCS and the battery cluster, and when the conditions are not met, cut the PCS liquid cooling device out of the liquid cooling system. By utilizing the characteristic of the relatively high working temperature of the PCS, use its waste heat to heat the battery cells, reduce the power consumption of the PTC in the heating condition, and improve the cooling efficiency to achieve energy saving and power saving. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the coolant flow path of the liquid cooling system when implementing the battery cluster cooling control strategy in an embodiment of the present invention;

[0015] Figure 2 It is a schematic diagram of the coolant flow path of the liquid cooling system when implementing the PCS battery cluster integrated cooling control strategy in an embodiment of the present invention;

[0016] Figure 3Schematic diagram of the structure of an integrated energy-saving liquid-cooled terminal for a PCS and a battery cluster according to an embodiment of the present invention.

[0017] Label description:

[0018] 1. An integrated energy-saving liquid-cooled terminal for a PCS and a battery cluster; 2. Processor; 3. Memory; 4. PCS liquid-cooling device; 5. First three-way valve; 6. Second three-way valve; 7. Water-cooling unit; 8. Battery cluster liquid-cooling device. Detailed implementation manners

[0019] To describe the technical content, achieved objectives and effects of the present invention in detail, the following is described in conjunction with the implementation manners and with reference to the accompanying drawings.

[0020] Please refer to Figures 1 to 3 , an integrated energy-saving liquid-cooling control method for a PCS and a battery cluster, including:

[0021] Judge whether it satisfies that the ambient temperature ≥ 0 °C and ≤ 45 °C and the PCS temperature ≥ 80 °C. If it is satisfied, connect the liquid outlet of the battery cluster liquid-cooling device to the liquid inlet of the PCS liquid-cooling device, connect the liquid outlet of the PCS liquid-cooling device to the liquid inlet of the water-cooling unit, disconnect the connection between the liquid outlet of the battery cluster liquid-cooling device and the liquid inlet of the water-cooling unit, and execute the integrated cooling control strategy for the PCS and the battery cluster;

[0022] Otherwise, control the three-way valve to disconnect the connection between the liquid outlet of the battery cluster liquid-cooling device and the liquid inlet of the PCS liquid-cooling device, disconnect the connection between the liquid outlet of the PCS liquid-cooling device and the liquid inlet of the water-cooling unit, connect the liquid outlet of the battery cluster liquid-cooling device and the liquid inlet of the water-cooling unit, and execute the battery cluster cooling control strategy.

[0023] As can be seen from the above description, the beneficial effect of the present invention is: an integrated energy-saving liquid-cooling control method and system for a PCS and a battery cluster. When the conditions are met, the PCS liquid-cooling equipment is connected to the liquid-cooling system to achieve integrated liquid cooling of the PCS and the battery cluster, and when the conditions are not met, the PCS liquid-cooling equipment is cut out of the liquid-cooling system to achieve energy saving.

[0024] Further, the battery cluster cooling control strategy specifically includes:

[0025] If the ambient temperature ≥ 0 °C, execute the active heat dissipation strategy; if the ambient temperature < 0 °C, execute the natural heat dissipation strategy.

[0026] As can be seen from the above description, when the ambient temperature is low, natural heat dissipation is carried out to reduce the energy consumption of the liquid-cooling system.

[0027] Further, the natural heat dissipation strategy includes:

[0028] S21. Control the water pump of the water-cooling unit to operate at a 50% duty cycle;

[0029] If 0°C > ambient temperature ≥ -10°C, then control the compressor of the water-cooled unit not to operate and the fan to operate at 80% speed for a set duration, and then execute step S22;

[0030] If ambient temperature < -10°C and ≥ -20°C, then control the compressor of the water-cooled unit not to operate and the fan to operate at 50% speed for a set duration, and then execute step S22;

[0031] If ambient temperature < -10°C and ≥ -20°C, then control the compressor of the water-cooled unit not to operate and the fan to operate at 50% speed for a set duration, and then execute step S22;

[0032] If ambient temperature < -20°C and ≥ -30°C, then control the compressor of the water-cooled unit not to operate and the fan to operate at 35% speed for a set duration, and then execute step S22;

[0033] If ambient temperature < -30°C and ≥ -40°C, then control the compressor of the water-cooled unit not to operate and the fan to operate at 25% speed for a set duration, and then execute step S23.

[0034] S22: If the heat exchange capacity of the liquid cooling system ≥ 80% of the rated cooling capacity of the water-cooled unit, then control the compressor of the water-cooled unit not to operate, and the fan to operate continuously at 80% speed;

[0035] If 80% of the rated cooling capacity of the water-cooled unit > heat exchange capacity of the liquid cooling system ≥ 50% of the rated cooling capacity of the water-cooled unit, then control the compressor of the water-cooled unit not to operate, and the fan to operate continuously at 50% speed;

[0036] If the actual cooling capacity of the cooling unit ≤ 50% of the rated cooling capacity of the water-cooled unit, then control the compressor of the water-cooled unit not to operate, and the fan to operate continuously at 35% speed;

[0037] S23: If the heat exchange capacity of the liquid cooling system ≥ 80% of the rated cooling capacity of the water-cooled unit, then control the compressor of the water-cooled unit not to operate, and the fan to operate continuously at 50% speed;

[0038] If 80% of the rated cooling capacity of the water-cooled unit > heat exchange capacity of the liquid cooling system ≥ 50% of the rated cooling capacity of the water-cooled unit, then control the compressor of the water-cooled unit not to operate, and the fan to operate continuously at 35% speed;

[0039] If the actual cooling capacity of the cooling unit ≤ 50% of the rated cooling capacity of the water-cooled unit, then control the compressor of the water-cooled unit not to operate, and the fan to operate continuously at 25% speed.

[0040] As described above, a stepped control strategy is designed for natural heat dissipation based on the current ambient temperature and the heat exchange capacity of the liquid cooling system, so that the noise and energy consumption of the water-cooled unit are minimized as much as possible.

[0041] Furthermore, the active heat dissipation strategy includes:

[0042] S31. Control the water pump of the chiller to operate at a 50% duty cycle;

[0043] If the ambient temperature ≥ 35 °C, control the compressor of the water-cooled unit to operate at an 80% duty cycle and the fan to operate at an 80% speed for a set duration, and then execute step S22;

[0044] If the ambient temperature < 35 °C and ≥ 25 °C, control the compressor of the water-cooled unit to operate at a 50% duty cycle and the fan to operate at a 50% speed for a set duration, and then execute step S32;

[0045] If the ambient temperature < 25 °C and ≥ 0 °C, control the compressor of the water-cooled unit to operate at a 30% duty cycle and the fan to operate at a 35% speed for a set duration, and then execute step S32;

[0046] S32. If the heat exchange capacity of the liquid cooling system ≥ 80% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at an 80% duty cycle and the fan to operate continuously at an 80% speed;

[0047] If 80% of the rated cooling capacity of the water-cooled unit > the heat exchange capacity of the liquid cooling system ≥ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at a 50% duty cycle and the fan to operate continuously at a 50% speed;

[0048] If the actual cooling capacity of the chiller ≤ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at a 30% duty cycle and the fan to operate continuously at a 35% speed.

[0049] As described above, a stepped control strategy is designed for active heat dissipation based on the current ambient temperature and the heat exchange capacity of the liquid cooling system, so that the noise and energy consumption of the water-cooled unit are minimized as much as possible.

[0050] Furthermore, the PCS battery cluster integrated cooling control strategy includes the following steps:

[0051] S11. Control the water pump of the chiller to operate at an 80% duty cycle and adjust the expansion valve opening to 50%;

[0052] If the ambient temperature ≥ 35 °C, control the compressor of the water-cooled unit to operate at an 80% duty cycle and the fan to operate at an 80% speed for a set duration, and then execute step S12;

[0053] If the ambient temperature is < 35 °C and ≥ 25 °C, control the compressor of the water-cooled unit to operate at a 50% duty cycle and the fan to operate at 50% speed for a set duration, and then execute step S12;

[0054] If the ambient temperature is < 25 °C and ≥ 0 °C, control the compressor of the water-cooled unit to operate at a 30% duty cycle and the fan to operate at 35% speed for a set duration, and then execute step S12;

[0055] S12. If the sum of the heat exchange capacity of the liquid cooling system and the PCS heat load ≥ 80% of the rated cooling capacity of the water-cooled unit and the heat exchange capacity of the liquid cooling system ≥ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at an 80% duty cycle, the fan to operate continuously at 80% speed, adjust the expansion valve opening to 60%, and the water pump to operate at a 90% duty cycle;

[0056] If 80% of the rated cooling capacity of the water-cooled unit > the sum of the heat exchange capacity of the liquid cooling system and the PCS heat load ≥ 50% of the rated cooling capacity of the water-cooled unit and the heat exchange capacity of the liquid cooling system ≥ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at an 80% duty cycle, the fan to operate continuously at 50% speed, adjust the expansion valve opening to 50%, and the water pump to operate at a 60% duty cycle;

[0057] If the sum of the actual cooling capacity of the cooling unit and the PCS heat load < 50% of the rated cooling capacity of the water-cooled unit and the heat exchange capacity of the liquid cooling system ≥ 30% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at a 30% duty cycle, the fan to operate continuously at 35% speed, adjust the expansion valve opening to 50%, and the water pump to operate at a 40% duty cycle.

[0058] As described above, a stepped control strategy is designed for the integrated heat dissipation of the PCS and the battery cluster according to the current ambient temperature and the heat exchange capacity of the liquid cooling system, so that the noise and energy consumption of the water-cooled unit are minimized as much as possible.

[0059] Further, the PCS heat load is specifically 3% of the current operating power of the PCS.

[0060] As described above, the calculation method of the PCS heat load is given.

[0061] Further, the heat exchange capacity of the liquid cooling system is calculated according to the following formula:

[0062] C * M * (Tout - Tin);

[0063] In the formula, C is the specific heat capacity of the coolant, M is the mass flow rate of the coolant, Tout is the water temperature at the outlet of the water-cooled unit, and Tin is the water temperature at the inlet of the water-cooled unit.

[0064] As described above, the calculation formula of the heat exchange capacity of the liquid cooling system is given.

[0065] A PCS and battery cluster integrated energy-saving liquid cooling system, comprising a PCS and battery cluster integrated energy-saving liquid cooling terminal, a first three-way valve, a second three-way valve, a PCS liquid cooling device, a water cooling unit, and a battery cluster liquid cooling device. The liquid inlet of the water cooling unit is connected to the first interface of the second three-way valve, the liquid outlet of the water cooling unit is connected to the liquid inlet of the battery cluster liquid cooling device, the liquid outlet of the battery cluster liquid cooling device is connected to the first end of the first three-way valve, the second end of the first three-way valve is connected to the second end of the second three-way valve, the third end of the first three-way valve is connected to the liquid inlet of the PCS liquid cooling device, and the liquid outlet of the PCS liquid cooling device is connected to the third end of the second three-way valve;

[0066] The liquid inlet and liquid outlet of the water cooling unit are provided with temperature sensors, and the PCS and battery cluster integrated energy-saving liquid cooling terminal is electrically connected to the first three-way valve, the second three-way valve, the temperature sensors at the liquid inlet and liquid outlet of the water cooling unit, and each device in the water cooling unit;

[0067] The PCS and battery cluster integrated energy-saving liquid cooling terminal includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the method described above is implemented.

[0068] The present invention is used for the cooling of energy storage systems to perform integrated cooling management control of the PCS and battery cluster.

[0069] Please refer to Figures 1 to 2 , the first embodiment of the present invention is:

[0070] A PCS and battery cluster integrated energy-saving liquid cooling control method, which runs on a PCS and battery cluster integrated energy-saving liquid cooling system as shown in Figure 1 and Figure 2 . The method includes:

[0071] Judge whether the PCS liquid cooling refrigeration condition is satisfied. If it is satisfied, please refer to Figure 2 , then connect the liquid outlet of the battery cluster liquid cooling device to the liquid inlet of the PCS liquid cooling device, connect the liquid outlet of the PCS liquid cooling device and the liquid inlet of the water cooling unit, disconnect the connection between the liquid outlet of the battery cluster liquid cooling device and the liquid inlet of the water cooling unit, and execute the PCS battery cluster integrated cooling control strategy;

[0072] Otherwise, please refer to Figure 1 , control the three-way valve to disconnect the connection between the liquid outlet of the battery cluster liquid cooling device and the liquid inlet of the PCS liquid cooling device, disconnect the connection between the liquid outlet of the PCS liquid cooling device and the liquid inlet of the water cooling unit, connect the liquid outlet of the battery cluster liquid cooling device and the liquid inlet of the water cooling unit, and execute the battery cluster cooling control strategy.

[0073] In this embodiment, the PCS liquid cooling refrigeration conditions are specifically that the ambient temperature is ≥ 0 °C and ≤ 45 °C and the PCS temperature is ≥ 80 °C.

[0074] The PCS battery cluster integrated cooling control strategy includes the following steps:

[0075] S11. Control the water pump of the chiller to operate at a 80% duty cycle, and adjust the expansion valve opening to 50%;

[0076] If the ambient temperature is ≥ 35 °C, control the compressor of the water-cooled unit to operate at an 80% duty cycle and the fan to operate at an 80% speed for a set duration, and then execute step S12; so that the noise is ≤ 70 dB and the power consumption of the water-cooled unit is ≤ 80% of the rated value;

[0077] If the ambient temperature is < 35 °C and ≥ 25 °C, control the compressor of the water-cooled unit to operate at a 50% duty cycle and the fan to operate at a 50% speed for a set duration, and then execute step S12; so that the noise is ≤ 60 dB and the power consumption of the water-cooled unit is ≤ 65% of the rated value;

[0078] If the ambient temperature is < 25 °C and ≥ 0 °C, control the compressor of the water-cooled unit to operate at a 30% duty cycle and the fan to operate at a 35% speed for a set duration, and then execute step S12; so that the noise is ≤ 50 dB and the power consumption of the water-cooled unit is ≤ 45% of the rated value.

[0079] S12. If the sum of the heat exchange amount of the liquid cooling system and the PCS heat load is ≥ 80% of the rated cooling capacity of the water-cooled unit and the heat exchange amount of the liquid cooling system is ≥ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at an 80% duty cycle, the fan to operate continuously at an 80% speed, adjust the expansion valve opening to 60%, and the water pump to operate at a 90% duty cycle;

[0080] If 80% of the rated cooling capacity of the water-cooled unit > the sum of the heat exchange amount of the liquid cooling system and the PCS heat load ≥ 50% of the rated cooling capacity of the water-cooled unit and the heat exchange amount of the liquid cooling system is ≥ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at an 80% duty cycle, the fan to operate continuously at a 50% speed, adjust the expansion valve opening to 50%, and the water pump to operate at a 60% duty cycle; so that the noise is ≤ 60 dB and the power consumption of the water-cooled unit is ≤ 65% of the rated value;

[0081] If the sum of the actual cooling capacity of the cooling unit and the PCS heat load < 50% of the rated cooling capacity of the water-cooled unit and the heat exchange amount of the liquid cooling system is ≥ 30% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at a 30% duty cycle, the fan to operate continuously at a 35% speed, adjust the expansion valve opening to 50%, and the water pump to operate at a 40% duty cycle; so that the noise is ≤ 50 dB and the power consumption of the water-cooled unit is ≤ 45% of the rated value.

[0082] The battery cluster cooling control strategy specifically includes:

[0083] If the ambient temperature ≥ 0 °C, the active heat dissipation strategy is executed; if the ambient temperature < 0 °C, the natural heat dissipation strategy is executed.

[0084] The natural heat dissipation strategy includes:

[0085] S21. Control the water pump of the chiller to operate at a 50% duty cycle;

[0086] If 0 °C > ambient temperature ≥ -10 °C, control the compressor of the water-cooled unit not to operate and the fan to operate at 80% speed for a set duration, and then execute step S22; so that the noise ≤ 70 dB and the power consumption of the water-cooled unit ≤ 30% of the rated value;

[0087] If the ambient temperature < -10 °C and ≥ -20 °C, control the compressor of the water-cooled unit not to operate and the fan to operate at 50% speed for a set duration, and then execute step S22; so that the noise ≤ 60 dB and the power consumption of the water-cooled unit ≤ 25% of the rated value;

[0088] If the ambient temperature < -10 °C and ≥ -20 °C, control the compressor of the water-cooled unit not to operate and the fan to operate at 50% speed for a set duration, and then execute step S22; so that the noise ≤ 60 dB and the power consumption of the water-cooled unit ≤ 25% of the rated value;

[0089] If the ambient temperature < -20 °C and ≥ -30 °C, control the compressor of the water-cooled unit not to operate and the fan to operate at 35% speed for a set duration, and then execute step S22; so that the noise ≤ 50 dB and the power consumption of the water-cooled unit ≤ 20% of the rated value;

[0090] If the ambient temperature < -30 °C and ≥ -40 °C, control the compressor of the water-cooled unit not to operate and the fan to operate at 25% speed for a set duration, and then execute step S23; so that the noise ≤ 40 dB and the power consumption of the water-cooled unit ≤ 15% of the rated value.

[0091] S22. If the heat exchange capacity of the liquid cooling system ≥ 80% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit not to operate, and the fan to operate continuously at 80% speed;

[0092] If 80% of the rated cooling capacity of the water-cooled unit > heat exchange capacity of the liquid cooling system ≥ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit not to operate, and the fan to operate continuously at 50% speed; so that the noise ≤ 60 dB and the power consumption of the water-cooled unit ≤ 25% of the rated value;

[0093] If the actual refrigerating capacity of the cold unit ≤ 50% of the rated refrigerating capacity of the water-cooled unit, then control the compressor of the water-cooled unit not to operate, and the fan runs continuously at 35% speed; so that the noise ≤ 50 dB and the power consumption of the water-cooled unit ≤ 20% of the rated value.

[0094] S23. If the heat exchange capacity of the liquid cooling system ≥ 80% of the rated refrigerating capacity of the water-cooled unit, then control the compressor of the water-cooled unit not to operate, and the fan runs continuously at 50% speed; so that the noise ≤ 60 dB and the power consumption of the water-cooled unit ≤ 25% of the rated value;

[0095] If 80% of the rated refrigerating capacity of the water-cooled unit > the heat exchange capacity of the liquid cooling system ≥ 50% of the rated refrigerating capacity of the water-cooled unit, then control the compressor of the water-cooled unit not to operate, and the fan runs continuously at 35% speed; so that the noise ≤ 50 dB and the power consumption of the water-cooled unit ≤ 20% of the rated value;

[0096] If the actual refrigerating capacity of the cold unit ≤ 50% of the rated refrigerating capacity of the water-cooled unit, then control the compressor of the water-cooled unit not to operate, and the fan runs continuously at 25% speed; so that the noise ≤ 40 dB and the power consumption of the water-cooled unit ≤ 15% of the rated value.

[0097] The active heat dissipation strategy includes:

[0098] S31. Control the water pump of the chiller to operate at 50% duty cycle;

[0099] If the ambient temperature ≥ 35 °C, then control the compressor of the water-cooled unit to operate at 80% duty cycle and the fan to run at 80% speed for a set duration, and then execute step S22; so that the noise ≤ 70 dB and the power consumption of the water-cooled unit ≤ 80% of the rated value;

[0100] If the ambient temperature < 35 °C and ≥ 25 °C, then control the compressor of the water-cooled unit to operate at 50% duty cycle and the fan to run at 50% speed for a set duration, and then execute step S32; so that the noise ≤ 60 dB and the power consumption of the water-cooled unit ≤ 65% of the rated value;

[0101] If the ambient temperature < 25 °C and ≥ 0 °C, then control the compressor of the water-cooled unit to operate at 30% duty cycle and the fan to run at 35% speed for a set duration, and then execute step S32; so that the noise ≤ 50 dB and the power consumption of the water-cooled unit ≤ 45% of the rated value.

[0102] S32. If the heat exchange capacity of the liquid cooling system ≥ 80% of the rated refrigerating capacity of the water-cooled unit, then control the compressor of the water-cooled unit to operate at 80% duty cycle, and the fan runs continuously at 80% speed;

[0103] If 80% of the rated cooling capacity of the water-cooled unit > the heat exchange capacity of the liquid-cooled system ≥ 50% of the rated cooling capacity of the water-cooled unit, then control the compressor of the water-cooled unit to operate at a 50% duty cycle, and the fan to continuously operate at 50% speed; so that the noise ≤ 60 dB and the power consumption of the water-cooled unit ≤ 65% of the rated value.

[0104] If the actual cooling capacity of the cold unit ≤ 50% of the rated cooling capacity of the water-cooled unit, then control the compressor of the water-cooled unit to operate at a 30% duty cycle, and the fan to continuously operate at 35% speed; so that the noise ≤ 50 dB and the power consumption of the water-cooled unit ≤ 45% of the rated value.

[0105] In this embodiment, the set duration is specifically 30 min, the heat load of the PCS is specifically 3% of the current operating power of the PCS, and the heat exchange capacity of the liquid-cooled system is calculated according to the following formula:

[0106] C * M * (Tout - Tin);

[0107] In the formula, C is the specific heat capacity of the coolant, M is the mass flow rate of the coolant, Tout is the water temperature at the outlet of the water-cooled unit, Tin is the water temperature at the inlet of the water-cooled unit. In this embodiment, the specific heat capacity C of the coolant is specifically 3300 J / (kg·°C), and the mass flow rate M of the coolant is specifically 0.9 kg / s.

[0108] Please refer to Figures 1 - 3 , Embodiment 2 of the present invention is:

[0109] An integrated energy-saving liquid-cooled system for a PCS and a battery cluster, including an integrated energy-saving liquid-cooled terminal 1 for a PCS and a battery cluster, a first three-way valve 5, a second three-way valve 6, a PCS liquid-cooled device 4, a water-cooled unit 7, and a battery cluster liquid-cooled device 8. The liquid inlet of the water-cooled unit 7 is connected to the first interface of the second three-way valve 6, the liquid outlet of the water-cooled unit 7 is connected to the liquid inlet of the battery cluster liquid-cooled device 8, the liquid outlet of the battery cluster liquid-cooled device 8 is connected to the first end of the first three-way valve 5, the second end of the first three-way valve 5 is connected to the second end of the second three-way valve 6, the third end of the first three-way valve 5 is connected to the liquid inlet of the PCS liquid-cooled device 4, and the liquid outlet of the PCS liquid-cooled device 4 is connected to the third interface of the second three-way valve 6.

[0110] The liquid inlet and outlet of the water-cooled unit 7 are equipped with temperature sensors to collect the inlet and outlet liquid temperatures for calculation. The integrated energy-saving liquid-cooled terminal 1 for a PCS and a battery cluster is electrically connected to the first three-way valve 5, the second three-way valve 6, the temperature sensors at the liquid inlet and outlet of the water-cooled unit 7, and each device inside the water-cooled unit 7.

[0111] The described PCS and battery cluster integrated energy-saving liquid cooling terminal 1 includes a memory 3, a processor 2, and a computer program stored on the memory 3 and executable on the processor 2. When the processor 2 executes the computer program, the steps of the first embodiment are implemented.

[0112] In summary, for the PCS and battery cluster integrated energy-saving liquid cooling control method and system provided by the present invention, when the conditions are met, the PCS liquid cooling device is connected to the liquid cooling system to achieve integrated liquid cooling of the PCS and the battery cluster, and when the conditions are not met, the PCS liquid cooling device is cut out of the liquid cooling system to achieve energy saving and power saving.

[0113] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A PCS and battery cluster integrated energy-saving liquid cooling control method, characterized in that: Judge whether the environmental temperature ≥ 0 °C and ≤ 45 °C and the PCS temperature ≥ 80 °C are satisfied. If satisfied, connect the liquid outlet of the battery cluster liquid cooling device to the liquid inlet of the PCS liquid cooling device, connect the liquid outlet of the PCS liquid cooling device to the liquid inlet of the water-cooled unit, disconnect the connection between the liquid outlet of the battery cluster liquid cooling device and the liquid inlet of the water-cooled unit, and execute the PCS battery cluster integrated cooling control strategy; Otherwise, control the three-way valve to disconnect the connection between the liquid outlet of the battery cluster liquid cooling device and the liquid inlet of the PCS liquid cooling device, disconnect the connection between the liquid outlet of the PCS liquid cooling device and the liquid inlet of the water-cooled unit, connect the liquid outlet of the battery cluster liquid cooling device and the liquid inlet of the water-cooled unit, and execute the battery cluster cooling control strategy; The battery cluster cooling control strategy specifically includes: If the environmental temperature ≥ 0 °C, execute the active heat dissipation strategy; If the environmental temperature < 0 °C, execute the natural heat dissipation strategy.

2. The PCS and battery cluster integrated energy-saving liquid cooling control method according to claim 1, wherein The natural heat dissipation strategy includes: S21. Control the water pump of the water-cooled unit to run at a 50% duty cycle; If 0 °C > environmental temperature ≥ -10 °C, control the compressor of the water-cooled unit not to run and the fan to run at 80% speed for a set duration, and then execute step S22; If the environmental temperature < -10 °C and ≥ -20 °C, control the compressor of the water-cooled unit not to run and the fan to run at 50% speed for a set duration, and then execute step S22; If the environmental temperature < -20 °C and ≥ -30 °C, control the compressor of the water-cooled unit not to run and the fan to run at 35% speed for a set duration, and then execute step S22; If the environmental temperature < -30 °C and ≥ -40 °C, control the compressor of the water-cooled unit not to run and the fan to run at 25% speed for a set duration, and then execute step S23; S22. If the heat exchange capacity of the liquid cooling system ≥ 80% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit not to run, and the fan to run continuously at 80% speed; If 80% of the rated cooling capacity of the water-cooled unit > the heat exchange capacity of the liquid cooling system ≥ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit not to run, and the fan to run continuously at 50% speed; If the actual cooling capacity of the water-cooled unit ≤ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit not to run, and the fan to run continuously at 35% speed; S23. If the heat exchange capacity of the liquid cooling system ≥ 80% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit not to run, and the fan to run continuously at 50% speed; If 80% of the rated cooling capacity of the water-cooled unit > the heat exchange capacity of the liquid cooling system ≥ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit not to run, and the fan to run continuously at 35% speed; If the actual cooling capacity of the water-cooled unit ≤ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit not to run, and the fan to run continuously at 25% speed.

3. A PCS and battery cluster integrated energy-saving liquid cooling control method according to claim 1, characterized in that, The active heat dissipation strategy includes: S31. Control the water pump of the water-cooled unit to run at a 50% duty cycle; If the ambient temperature ≥ 35 °C, control the compressor of the water-cooled unit to operate at a duty cycle of 80% and the fan to operate at a speed of 80% for a set duration, and then execute step S32; If the ambient temperature < 35 °C and ≥ 25 °C, control the compressor of the water-cooled unit to operate at a duty cycle of 50% and the fan to operate at a speed of 50% for a set duration, and then execute step S32; If the ambient temperature < 25 °C and ≥ 0 °C, control the compressor of the water-cooled unit to operate at a duty cycle of 30% and the fan to operate at a speed of 35% for a set duration, and then execute step S32; S32: If the heat exchange capacity of the liquid cooling system ≥ 80% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at a duty cycle of 80%, and the fan to operate continuously at a speed of 80%; If 80% of the rated cooling capacity of the water-cooled unit > the heat exchange capacity of the liquid cooling system ≥ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at a duty cycle of 50%, and the fan to operate continuously at a speed of 50%; If the actual cooling capacity of the water-cooled unit ≤ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at a duty cycle of 30%, and the fan to operate continuously at a speed of 35%.

4. A PCS and battery cluster integrated energy-saving liquid cooling control method according to claim 3, characterized in that The PCS battery cluster integrated cooling control strategy includes the following steps: S11: Control the water pump of the water-cooled unit to operate at a duty cycle of 80%, and adjust the expansion valve opening to 50%; If the ambient temperature ≥ 35 °C, control the compressor of the water-cooled unit to operate at a duty cycle of 80% and the fan to operate at a speed of 80% for a set duration, and then execute step S12; If the ambient temperature < 35 °C and ≥ 25 °C, control the compressor of the water-cooled unit to operate at a duty cycle of 50% and the fan to operate at a speed of 50% for a set duration, and then execute step S12; If the ambient temperature < 25 °C and ≥ 0 °C, control the compressor of the water-cooled unit to operate at a duty cycle of 30% and the fan to operate at a speed of 35% for a set duration, and then execute step S12; S12: If the sum of the heat exchange capacity of the liquid cooling system and the PCS heat load ≥ 80% of the rated cooling capacity of the water-cooled unit and the heat exchange capacity of the liquid cooling system ≥ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at a duty cycle of 80%, the fan to operate continuously at a speed of 80%, adjust the expansion valve opening to 60%, and the water pump to operate at a duty cycle of 90%; If 80% of the rated cooling capacity of the water-cooled unit > the sum of the heat exchange capacity of the liquid cooling system and the PCS heat load ≥ 50% of the rated cooling capacity of the water-cooled unit and the heat exchange capacity of the liquid cooling system ≥ 50% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at a duty cycle of 80%, the fan to operate continuously at a speed of 50%, adjust the expansion valve opening to 50%, and the water pump to operate at a duty cycle of 60%; If the sum of the actual cooling capacity of the water-cooled unit and the PCS heat load < 50% of the rated cooling capacity of the water-cooled unit and the heat exchange capacity of the liquid cooling system ≥ 30% of the rated cooling capacity of the water-cooled unit, control the compressor of the water-cooled unit to operate at a duty cycle of 30%, the fan to operate continuously at a speed of 35%, adjust the expansion valve opening to 50%, and the water pump to operate at a duty cycle of 40%.

5. A PCS and battery cluster integrated energy-saving liquid cooling control method according to claim 4, characterized in that, The PCS heat load is specifically 3% of the current operating power of the PCS.

6. A PCS and battery cluster integrated energy-saving liquid cooling control method according to claim 4, characterized in that The heat exchange capacity of the liquid cooling system is calculated according to the following formula: C*M*(Tout-Tin); Where C is the specific heat capacity of the coolant, M is the mass flow rate of the coolant, Tout is the water temperature at the outlet of the water-cooled unit, and Tin is the water temperature at the inlet of the water-cooled unit.

7. A PCS and battery cluster integrated energy-saving liquid cooling system, characterized in that, It includes a PCS and battery cluster integrated energy-saving liquid cooling terminal, a first three-way valve, a second three-way valve, a PCS liquid cooling device, a water-cooled unit, and a battery cluster liquid cooling device. The liquid inlet of the water-cooled unit is connected to the first interface of the second three-way valve, the liquid outlet of the water-cooled unit is connected to the liquid inlet of the battery cluster liquid cooling device, the liquid outlet of the battery cluster liquid cooling device is connected to the first end of the first three-way valve, the second end of the first three-way valve is connected to the second end of the second three-way valve, the third end of the first three-way valve is connected to the liquid inlet of the PCS liquid cooling device, and the liquid outlet of the PCS liquid cooling device is connected to the third interface of the second three-way valve; The liquid inlet and outlet of the water-cooled unit are equipped with temperature sensors, and the PCS and battery cluster integrated energy-saving liquid cooling terminal is electrically connected to the first three-way valve, the second three-way valve, the temperature sensors at the liquid inlet and outlet of the water-cooled unit, and each device inside the water-cooled unit; The PCS and battery cluster integrated energy-saving liquid cooling terminal includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it implements the method according to any one of claims 1-6.

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