Thermal management system and method of controlling the same

Abstract

This invention belongs to the technical field of thermal management and discloses a thermal management system and its control method. It aims to solve the problems of limited adjustable output capacity and poor stability in existing thermal management systems. The thermal management system includes a compressor, a condenser, a first throttling element, an evaporator, a heat drive, and a radiator; the compressor, condenser, first throttling element, and evaporator form a refrigeration pipeline, and the evaporator, heat drive, and radiator form a coolant pipeline, with the heat drive capable of sequentially dissipating heat from the radiator and condenser; the thermal management system also includes a control component; the control component includes: a valve group including an input side, a first output side, and a second output side; the input side is connected to the battery outlet, the first output side is connected to the input side of the coolant pipeline, and the second output side is connected to the input side of the evaporator; the second throttling element is disposed in the first pipeline, the first end of the first pipeline is connected to the compressor outlet, and the second end of the first pipeline is connected to the evaporator inlet.

Description

Technical Field

[0001] This invention relates to the technical field of thermal management, and more particularly to a thermal management system and its control method. Background Technology

[0002] Currently, thermal management units for energy storage batteries generally employ vapor compression refrigeration to cool the cooling medium, and are equipped with variable frequency compressors to adapt to the battery's heat dissipation requirements under different environments and charge / discharge rates. Since batteries require heat dissipation under various ambient temperature conditions, the thermal management unit needs to meet the requirements of full-condition cooling operation; the typical operating temperature range of the battery is between -30°C and 45°C.

[0003] In low-temperature refrigeration conditions, due to the low ambient temperature, the refrigeration lines of the thermal management unit may experience low condensing pressure (low compression ratio), which can easily lead to difficulties in compressor oil supply. Therefore, the thermal management unit needs to be equipped with a condensing pressure regulating valve to maintain the condensing pressure, and also needs to be equipped with a compressor oil heater to prevent refrigerant migration at low temperatures. The aforementioned condensing pressure regulating valve in the thermal management unit needs to have a set threshold. When the condensing pressure reaches the threshold, the valve opens to maintain the system condensing pressure. An increase in condensing pressure corresponds to an increase in energy consumption. The thermal management unit must maintain this condensing pressure in low-temperature environments; a decrease in ambient temperature does not necessarily lead to a decrease in energy consumption. To prevent static migration of the refrigerant at low temperatures, the refrigeration lines need to be equipped with an oil heater. In low-temperature environments, the oil heater needs to operate continuously, leading to high energy consumption. Furthermore, in areas with prolonged periods of low temperatures, the compressor operates at low frequency and low pressure ratio for extended periods, which can easily cause malfunctions in system oil supply and lubrication, resulting in decreased system reliability. Due to the minimum speed limit of the compressor oil, the output capacity of the thermal management unit can only be adjusted to a limited extent. In low-temperature environments, the mismatch between the compressor's capacity at the minimum speed and the heat generated by the battery during low-rate charging and discharging becomes more severe. This causes the water temperature to drop rapidly after the thermal management unit starts up, and the unit stops after reaching the alarm value. When the temperature rises, the compressor needs to be started again in a timely manner. The frequent loading and unloading of the compressor reduces the reliability of the thermal management unit. Summary of the Invention

[0004] The purpose of this invention is to provide a thermal management system that addresses the problems of limited adjustable output capacity and poor reliability in existing thermal management systems.

[0005] To achieve this objective, the present invention adopts the following technical solution: a thermal management system, including a compressor, a condenser, a first throttling element, an evaporator, a heat drive, and a radiator;

[0006] The compressor, condenser, first throttling element, evaporator and heat drive form a refrigeration pipeline, the evaporator, the heat drive and radiator form a coolant pipeline, and the heat drive can dissipate heat to the radiator and the condenser in sequence.

[0007] The thermal management system also includes a control component;

[0008] The control component includes:

[0009] A valve assembly, comprising an input side, a first output side, and a second output side;

[0010] The input side is connected to the battery outlet, the first output side is connected to the input side of the coolant pipeline, and the second output side is connected to the input side of the refrigeration pipeline.

[0011] The second throttling element is disposed in the first pipeline, the first end of the first pipeline is connected to the outlet of the compressor, and the second end of the first pipeline is connected to the inlet of the evaporator.

[0012] Preferably, the control component further includes:

[0013] The third throttling element is installed in the second pipeline;

[0014] The first end of the second pipeline is connected to the outlet of the condenser, and the second end of the second pipeline is connected to the inlet of the compressor.

[0015] Preferably, the third throttling element is an expansion valve or a capillary tube.

[0016] Preferably, the thermal management system further includes an input pump;

[0017] The input pump is connected to the coolant input pipeline;

[0018] The first end of the coolant inlet pipe is connected to the battery outlet, and the second end of the coolant inlet pipe is connected to the inlet of the inlet pump.

[0019] Preferably, the valve assembly includes a three-way valve;

[0020] The first output side is connected to the input end of the coolant pipeline, the second output side is connected to the input end of the refrigeration pipeline, and the three-way valve can control the input of coolant into the coolant pipeline and / or the refrigeration pipeline.

[0021] Preferably, the valve assembly includes a first valve and a second valve;

[0022] The first valve is connected to the inlet of the coolant line, and the second valve is connected to the inlet of the refrigeration line.

[0023] Preferably, the second throttling element includes an expansion valve, or a series combination of a solenoid valve and a capillary tube.

[0024] Preferably, the heat drive is a fan.

[0025] The control method for the aforementioned thermal management system includes the following steps:

[0026] The temperature difference is the difference between the temperature of the coolant after cooling and the ambient temperature.

[0027] When the thermal management system is in the condition that the ambient temperature is ≤ the temperature of the coolant to be cooled minus the temperature difference, the first output side of the valve group is fully opened;

[0028] The coolant to be cooled is cooled by adjusting the output power of the heat drive;

[0029] When the thermal management system is in the condition that the difference between the temperature of the coolant to be cooled and the temperature difference is less than the ambient temperature and less than the temperature of the coolant to be cooled, the opening degree of the first output side of the valve group and the opening degree of the second output side are adjustable, and the opening degree of the second throttling element is adjustable.

[0030] The coolant to be cooled is cooled by adjusting the output power of the compressor and the output power of the heat drive.

[0031] When the thermal management system is in a state where the ambient temperature is greater than or equal to the temperature of the coolant to be cooled, the second output side of the valve group is fully open, the opening degree of the first output side is adjustable, and the opening degree of the second throttling element is adjustable.

[0032] The coolant to be cooled is cooled by adjusting the output power of the compressor.

[0033] Preferably, when the thermal management system is in the condition that the difference between the temperature of the coolant to be cooled and the temperature difference is less than the ambient temperature and less than the temperature of the coolant to be cooled, the opening degree of the first output side of the valve group is adjustable, the opening degree of the second output side is adjustable, the opening degree of the second throttling element is adjustable, and the opening degree of the third throttling element is adjustable.

[0034] When the thermal management system is in a state where the ambient temperature is greater than or equal to the temperature of the coolant to be cooled, the second output side of the valve group is fully open, the opening degree of the first output side is adjustable, the opening degree of the second throttling element is adjustable, and the opening degree of the third throttling element is adjustable.

[0035] The beneficial effects of this invention are as follows: In the technical solution of this invention, during the cooling process of the coolant using the heat treatment system, when the ambient temperature is ≤ the temperature of the coolant to be cooled minus the temperature difference, the first output side of the valve group is fully opened, and the coolant flows through the radiator of the coolant pipeline, adjusting the output power of the heat drive and the heat dissipation capacity of the heat drive to the radiator, thereby achieving cooling of the coolant and resulting in significant energy savings. When the temperature difference between the coolant to be cooled and the temperature difference is < the ambient temperature < the temperature of the coolant to be cooled, the opening degree of the first and second output sides of the regulating valve group is adjustable, and the opening degree of the second throttling element is also adjustable, thus achieving cooling... The coolant passes through the evaporator in the refrigeration pipeline and the radiator in the coolant pipeline, respectively, adjusting the output power of the compressor and the heat drive to cool the coolant, resulting in significant energy savings. When the ambient temperature is greater than or equal to the temperature of the coolant to be cooled, the second output side of the valve assembly is fully opened, in conjunction with the adjustable opening of the first output side and the adjustable opening of the second throttling device. The coolant passes through the evaporator in the refrigeration pipeline, adjusting the compressor's output power to cool the coolant. Assisted adjustments to the opening of the first output side and the second throttling device maintain the compressor's minimum speed, achieving further cooling of the coolant and significant energy savings. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the thermal management system according to Embodiment 1 of the present invention;

[0037] Figure 2 This is a schematic diagram of the thermal management system of Embodiment 1 of the present invention under the condition that the ambient temperature is ≤ the temperature of the coolant to be cooled - the temperature difference;

[0038] Figure 3 This is a schematic diagram of the first stage of the thermal management system of Embodiment 1 of the present invention when the difference between the temperature of the coolant to be cooled and the temperature difference is less than the ambient temperature and less than the temperature of the coolant to be cooled.

[0039] Figure 4 This is a schematic diagram of the second stage of the thermal management system of Embodiment 1 of the present invention when the difference between the temperature of the coolant to be cooled and the temperature difference is less than the ambient temperature and less than the temperature of the coolant to be cooled.

[0040] Figure 5 This is a schematic diagram of the first stage of the thermal management system of Embodiment 1 of the present invention when the ambient temperature is ≥ the temperature of the coolant to be cooled.

[0041] Figure 6 This is a schematic diagram of the second stage of the thermal management system in Embodiment 1 of the present invention when the ambient temperature is ≥ the temperature of the coolant to be cooled;

[0042] Figure 7This is a schematic diagram of the third stage of the thermal management system in Embodiment 1 of the present invention when the ambient temperature is ≥ the temperature of the coolant to be cooled.

[0043] Figure 8 This is a schematic diagram of the thermal management system of Embodiment 2 of the present invention.

[0044] In the diagram: 1. Compressor; 2. Condenser; 3. First throttling element; 4. Evaporator; 5. Heat drive; 6. Radiator; 7. Three-way valve; 8. Second throttling element; 9. Third throttling element; 10. Input pump; 11. First valve; 12. Second valve. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0046] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0049] Example 1

[0050] First, refer to Figure 1 The thermal management system provided by this invention includes a compressor 1, a condenser 2, a first throttling element 3, an evaporator 4, a heat drive 5, and a radiator 6. The compressor 1, condenser 2, first throttling element 3, evaporator 4, and heat drive 5 form a refrigeration pipeline, and the evaporator 4, heat drive 5, and radiator 6 form a coolant pipeline. The heat drive 5 can sequentially dissipate heat from the radiator 6 and the condenser 2. In this embodiment, the heat drive 5 is a fan. The thermal management system also includes a control component. The control component includes a three-way valve 7, which includes an input side, a first output side, and a second output side. The input side is connected to the outlet of the battery, the first output side is connected to the input side of the radiator 6, and the second output side is connected to the input side of the evaporator 4. A second throttling element 8 is disposed in the first pipeline, the first end of the first pipeline is connected to the outlet of the compressor 1, and the second end of the first pipeline is connected to the inlet of the evaporator 4.

[0051] The control method for the aforementioned thermal management system includes the following steps:

[0052] The temperature difference is the difference between the temperature of the coolant after cooling and the ambient temperature. The temperature difference is determined by the configuration of the thermal management system and ranges from 5 degrees Celsius to 30 degrees Celsius. The temperature of the coolant after cooling ranges from 10 degrees Celsius to 20 degrees Celsius, and the ambient temperature is between -30 degrees Celsius and 60 degrees Celsius.

[0053] like Figure 2 As shown, during the cooling process of the coolant using this heat treatment system, when the thermal management system is in a condition where the ambient temperature is ≤ the temperature of the coolant to be cooled minus the temperature difference, the first output side of the valve group is fully opened; the coolant to be cooled is cooled by adjusting the output power of the heat drive 5; when the thermal management system is in a condition where the difference between the temperature of the coolant to be cooled and the temperature difference is < the ambient temperature is < the temperature of the coolant to be cooled, the opening degree of the first output side and the second output side of the valve group are adjustable, and the opening degree of the second throttling element 8 is adjustable; the coolant to be cooled is cooled by adjusting the output power of the compressor 1 and the output power of the heat drive 5; when the thermal management system is in a condition where the ambient temperature is ≥ the temperature of the coolant to be cooled, the second output side of the valve group is fully opened, the opening degree of the first output side is adjustable, and the opening degree of the second throttling element 8 is adjustable; the coolant to be cooled is cooled by adjusting the output power of the compressor 1.

[0054] Specifically, since the radiator 6 and condenser 2 are located in the same independent air duct, the fan can sequentially draw air from the radiator 6 and condenser 2 for heat dissipation. When the thermal management system is in a condition where the ambient temperature is ≤ the temperature of the coolant to be cooled minus the temperature difference, the first output side of the three-way valve 7 is fully open. The coolant from the battery outlet at a higher temperature enters the radiator 6 through the three-way valve 7, where forced convection heat exchange is achieved by the fan to cool the coolant. In this operating mode, the compressor 1 is not started; the output power of the fan is adjusted, i.e., the fan speed is adjusted, to achieve continuous load regulation. Those skilled in the art will understand that when the battery generates a large amount of heat, the fan speed is increased; when the battery generates a small amount of heat, the fan speed is decreased; when the fan reaches its minimum speed, the coolant temperature is stabilized by reducing the number of fans, etc.

[0055] In summary, in this operating mode, compressor 1 does not start, and the fan performs cooling, resulting in good energy savings. Depending on the ambient temperature, power consumption can be reduced by 30% to 70%, with the energy-saving effect being more pronounced at lower ambient temperatures. For example, when the temperature of the coolant to be cooled is 18 degrees Celsius, with a temperature difference of 25 degrees Celsius, and the ambient temperature is below -7 degrees Celsius, the refrigeration pipeline does not need to start. The coolant at 18 degrees Celsius is cooled by the ambient temperature, and this heat exchange temperature difference is sufficient to ensure that the system reaches its rated cooling capacity. Since the fan can achieve combined operation and stepless speed adjustment, the corresponding cooling capacity can also be steplessly adjusted from 0-100%.

[0056] like Figure 3 -to Figure 4 As shown, when the thermal management system is in a state where the temperature difference between the coolant to be cooled and the ambient temperature is less than the coolant temperature, in the first stage, a heat exchange temperature difference exists between the coolant to be cooled and the ambient temperature. The position of the three-way valve 7 is adjusted to the middle position, meaning that part of the coolant passes through the evaporator 4 and part passes through the radiator 6, so as to make full use of the air to cool the coolant and improve the system energy efficiency. In this operating mode, there are three ways to adjust the cooling capacity: ① Adjust the output power of the compressor 1; ② Adjust the opening of the first output side and the second output side of the three-way valve 7, that is, to distribute the coolant flow through the evaporator 4 on the refrigeration pipeline and the radiator 6 on the coolant pipeline, thereby increasing the cooling capacity output of the system and achieving a range of adjustment of 30% to 100% for the refrigeration pipeline; In the second stage, ③ Adjust the opening of the second throttling element 8 to achieve self-balancing of the refrigeration pipeline load by means of hot gas bypass, further adjusting the thermal management system, and the adjustment range can be reduced to 0.

[0057] Those skilled in the art will understand that when the battery generates a large amount of heat, the three-way valve 7 is adjusted to the middle position, and the compressor 1 runs at high speed. When the battery generates less heat, the flow rate of the radiator 6 is reduced by adjusting the opening of the three-way valve 7, which also reduces the speed of the compressor 1. When the battery continues to decrease, and the compressor 1 reaches its minimum speed but still cannot match the decrease in heat generation, the opening of the second throttling element 8 is adjusted to regulate the output capacity of the refrigeration pipeline. When the battery generates a further decrease in heat generation, the compressor 1 shuts down, the fan starts, and the fan enters the convection heat exchange and cooling process. Therefore, in the above mode, when the ambient temperature is lower than the temperature of the coolant to be cooled, the three-way valve 7 is open, and the radiator 6 has coolant, the ambient temperature can be used to naturally cool the coolant. At this time, the output power of the compressor 1 in the refrigeration pipeline can be appropriately reduced to achieve energy saving. Depending on the ambient temperature, power consumption can be reduced by 5% to 30%, and the lower the ambient temperature, the more obvious the energy saving advantage. For example, when the temperature of the coolant to be cooled is 18 degrees Celsius, the temperature difference is taken as 25 degrees Celsius, and the ambient temperature is between -7 degrees Celsius and 18 degrees Celsius, both the first and second output sides of the three-way valve 7 are open. A portion of the coolant is cooled by the lower ambient temperature, while another portion of the coolant is cooled by the evaporator 4 in the refrigeration pipeline and then mixed with the coolant at the outlet of the radiator 6. Since the radiator 6 bears part of the load, the output power of the compressor 1 can be reduced, and the power consumption of the entire system decreases.

[0058] like Figures 5 to 7 When the thermal management system is in a state where the ambient temperature is greater than or equal to the temperature of the coolant to be cooled, in the first stage, the second output side of the three-way valve 7 is fully open, and the coolant at a higher temperature enters the evaporator 4. At this time, the compressor 1 runs to cool the coolant. In this operating mode, there are three ways to adjust the cooling capacity: First stage, ① the second output side of the three-way valve 7 is fully open to adjust the output power of the compressor 1; Second stage, ② the opening of the first output side of the three-way valve 7 is adjusted so that the coolant passes through the radiator 6. When the ambient temperature is higher than the temperature of the coolant to be cooled, the cooling capacity can be adjusted by adjusting the opening of the radiator 6 to keep the coolant temperature constant; Third stage, ③ the opening of the second throttling element 8 is adjusted to achieve self-balancing of the refrigeration pipeline load by means of hot gas bypass, further adjusting the thermal management system.

[0059] Those skilled in the art will understand that when the battery generates a large amount of heat, the second output side of the three-way valve 7 is fully open, and all the coolant passes through the evaporator 4, causing the compressor 1 to run at high speed. As the battery heat generation decreases, the compressor 1 speed decreases. When the battery heat generation continues to decrease, and the compressor 1 reaches its minimum speed but still cannot match the decrease in heat generation, the opening of the first output side of the three-way valve 7 is adjusted, allowing a small amount of coolant to pass through the radiator 6. Since the ambient temperature is higher than the coolant temperature at this time, the ambient temperature has a heating effect on the coolant, which can offset part of the cooling capacity. When the battery heat generation decreases further, the opening of the second throttling element 8 is adjusted to regulate the output capacity of the refrigeration pipeline.

[0060] For example, when the temperature of the coolant to be cooled is 18 degrees Celsius and the ambient temperature is 35 degrees Celsius (higher than 18 degrees Celsius), the radiator 6 cannot cool the coolant. The system will adjust the output power of the compressor 1 to match the heat generated by the battery. When the heat generated by the battery is small and the output power of the compressor 1 has reached its minimum, the first output side of the three-way valve 7 opens. Part of the coolant heats itself by passing through the higher ambient temperature, and the other part is cooled by passing through the evaporator 4. Then it mixes with the coolant at the outlet of the radiator 6. At this time, the radiator 6 acts as a heat-absorbing element, which is equivalent to reducing the cooling capacity of the system to maintain the minimum speed of the compressor 1. When the heat dissipation of the battery is very low and the radiator 6 cannot handle the adjustment capacity, the opening of the second throttling device 8 is adjusted to adjust the output capacity of the refrigeration pipeline.

[0061] The second throttling element 8 is a hot gas bypass that runs from the outlet of the compressor 1 to the inlet of the evaporator 4. This can increase the inlet enthalpy of the evaporator 4 and reduce the cooling capacity.

[0062] For example, the control assembly further includes a third throttling element 9 disposed in the second pipeline; a first end of the second pipeline is connected to the outlet of the condenser 2, and a second end of the second pipeline is connected to the inlet of the compressor 1.

[0063] Specifically, the third throttling element 9 throttles the high-pressure coolant from the outlet of the condenser 2 to the inlet of the compressor 1, reducing the pressure to a low-pressure and low-temperature state. This is a liquid injection bypass. It then works in conjunction with the hot gas bypass of the second throttling element 8 to neutralize the hot and cold gases, increase the enthalpy value at the inlet of the evaporator 4, reduce the cooling capacity, and achieve low load.

[0064] It is worth mentioning that the adjustment of the opening of the second throttling element 8 and the third throttling element 9 is coordinated. First, the opening of the second throttling element 8 or the third throttling element 9 is adjusted. When the adjustment of the second throttling element 8 or the third throttling element 9 cannot meet the requirements, the two throttling elements are adjusted in coordination to achieve the best energy-saving effect.

[0065] like Figure 4-5As shown, those skilled in the art will understand that when the thermal management system is in a situation where the temperature difference between the coolant to be cooled and the ambient temperature is less than the temperature of the coolant to be cooled, a heat exchange temperature difference exists between the coolant to be cooled and the ambient temperature. Adjusting the position of the three-way valve 7 to the middle position means that part of the coolant passes through the evaporator 4 and part passes through the radiator 6, so as to make full use of the air to cool the coolant and improve the system energy efficiency. In this operating mode, there are three ways to adjust the cooling capacity: First stage, ① adjust the output power of the compressor 1; ② adjust the opening of the first output side and the second output side of the three-way valve 7, that is, to distribute the coolant flow through the evaporator 4 on the refrigeration pipeline and the radiator 6 on the coolant pipeline, thereby increasing the cooling capacity output of the system and achieving a 30% to 100% range adjustment of the refrigeration pipeline; Second stage, ③ adjust the opening of the second throttling element 8 and / or adjust the opening of the third throttling element 9, so as to achieve self-balancing of the load of the refrigeration pipeline by means of hot gas bypass and liquid injection bypass, further adjusting the thermal management system, and the adjustment range can be reduced to 0.

[0066] like Figures 5 to 7 As shown, when the thermal management system is in a state where the ambient temperature is greater than or equal to the temperature of the coolant to be cooled, the second output side of the three-way valve 7 is fully open, and the coolant at a higher temperature enters the evaporator 4. At this time, the compressor 1 runs to cool the coolant. In this operating mode, there are three ways to adjust the cooling capacity: First stage, ① the second output side of the three-way valve 7 is fully open to adjust the output power of the compressor 1; Second stage, ② the opening of the first output side of the three-way valve 7 is adjusted so that the coolant passes through the radiator 6. When the ambient temperature is higher than the temperature of the coolant to be cooled, the cooling capacity can be adjusted by adjusting the opening of the radiator 6 to keep the coolant temperature constant; Third stage, ③ the opening of the second throttling element 8 and / or the opening of the third throttling element 9 are adjusted to achieve self-balancing of the refrigeration pipeline load by means of hot gas bypass and liquid injection bypass, and further adjust the thermal management system.

[0067] For example, the third throttling element 9 is an expansion valve or a capillary tube.

[0068] Specifically, the first throttling element 3, the second throttling element 8, and the third throttling element 9 are preferably electronic expansion valves. In other embodiments, the first throttling element 3, the second throttling element 8, and the third throttling element 9 may also be thermal expansion valves or throttling capillary tubes, etc.

[0069] For example, the thermal management system further includes an input pump 10; the input pump 10 is connected to a coolant input line; a first end of the coolant input line is connected to the battery outlet, and a second end of the coolant input line is connected to the input port of the input pump 10.

[0070] Specifically, the coolant from the battery outlet is pumped into the coolant pipeline and the refrigeration pipeline by the input pump 10, thereby accelerating the flow rate of the coolant.

[0071] For example, the input pump 10 is a water pump. Since the coolant is a liquid, it is transported by a water pump, which makes the transport smoother and the power consumption of the water pump is lower.

[0072] For example, the second throttling element 8 includes an expansion valve, or a combination of a solenoid valve and a capillary tube connected in series.

[0073] Example 2

[0074] First, refer to Figure 8 The difference between this embodiment and Embodiment 1 is that the valve group includes a first valve 11 and a second valve 12; the first valve 11 is connected to the input end of the radiator 6, and the second valve 12 is connected to the input end of the evaporator 4.

[0075] Specifically, by connecting the first valve 11 to the input end of the radiator 6 and the second valve 12 to the input end of the evaporator 4, the first valve 11 controls the coolant flowing into the radiator 6 and the second valve 12 controls the coolant flowing into the evaporator 4, thus achieving the control effect of the three-way valve 7, that is, controlling the coolant flowing into the radiator 6 and the evaporator 4 respectively.

[0076] Those skilled in the art will understand that, during the cooling of the coolant using this heat treatment system, when the thermal management system is in a state where the ambient temperature is ≤ the temperature of the coolant to be cooled minus the temperature difference, the first valve 11 is fully open; the coolant to be cooled is cooled by adjusting the output power of the heat drive 5; when the thermal management system is in a state where the temperature difference between the coolant to be cooled and the temperature difference is < the ambient temperature is < the temperature of the coolant to be cooled, the opening of the first valve 11 and the second valve 12 are adjustable, and the opening of the second throttling element 8 and / or the third throttling element 9 is adjustable; the coolant to be cooled is cooled by adjusting the output power of the compressor 1 and the output power of the heat drive 5; when the thermal management system is in a state where the ambient temperature is ≥ the temperature of the coolant to be cooled, the second valve 12 is fully open, the opening of the first output side is adjustable, and the opening of the second throttling element 8 and / or the third throttling element 9 is adjustable; the coolant to be cooled is cooled by adjusting the output power of the compressor 1. It is worth mentioning that the adjustment of the opening of the second throttling element 8 and the third throttling element 9 is coordinated. First, the opening of the second throttling element 8 or the third throttling element 9 is adjusted. When the adjustment of the second throttling element 8 and the third throttling element 9 cannot meet the requirements, the two throttling elements are adjusted in coordination to achieve the best energy-saving effect.

[0077] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A thermal management system, characterized by, The system comprises a compressor (1), a condenser (2), a first throttling device (3), an evaporator (4), a heat sink (5) and a radiator (6); The compressor (1), the condenser (2), the first throttling device (3), the evaporator (4) and the heat sink (5) form a refrigeration pipeline, the evaporator (4), the heat sink (5) and the radiator (6) form a cooling liquid pipeline, and the heat sink (5) can sequentially dissipate heat to the radiator (6) and the condenser (2); The heat management system further comprises a control assembly; The control assembly comprises: A valve group comprising an input side, a first output side and a second output side; The input side is connected to the water outlet of the battery, the first output side is connected to the input side of the cooling liquid pipeline, and the second output side is connected to the input side of the refrigeration pipeline; A second throttling device (8) is arranged in a first pipeline, the first end of the first pipeline is connected to the outlet of the compressor (1), and the second end of the first pipeline is connected to the inlet of the evaporator (4); In the process of cooling the cooling liquid by using the heat management system, the temperature difference is the difference between the temperature of the cooling liquid after cooling and the ambient temperature; When the heat management system is in the case of ambient temperature ≤ cooling liquid temperature to be cooled - temperature difference, the first output side of the valve group is fully opened; The cooling liquid to be cooled is cooled by adjusting the output power of the heat sink (5); When the heat management system is in the case of the difference between the cooling liquid temperature to be cooled and the temperature difference < ambient temperature < cooling liquid temperature to be cooled, the opening degree of the first output side of the valve group and the opening degree of the second output side are adjustable, and the opening degree of the second throttling device (8) is adjustable; The cooling liquid to be cooled is cooled by adjusting the output power of the compressor (1) and adjusting the output power of the heat sink (5); When the heat management system is in the case of ambient temperature ≥ cooling liquid temperature to be cooled, the second output side of the valve group is fully opened, the opening degree of the first output side is adjustable, and the opening degree of the second throttling device (8) is adjustable; The cooling liquid to be cooled is cooled by adjusting the output power of the compressor (1).

2. The thermal management system of claim 1, wherein, The control assembly further comprises: A third throttling device (9) arranged in a second pipeline; The first end of the second pipeline is connected to the outlet of the condenser (2), and the second end of the second pipeline is connected to the inlet of the compressor (1).

3. The thermal management system of claim 2, wherein, The third throttling device (9) is an expansion valve or a capillary tube.

4. The thermal management system of claim 1, wherein, The heat management system further comprises an input pump (10); The input pump (10) is connected to a cooling liquid input pipeline; The first end of the cooling liquid input pipeline is connected to the water outlet of the battery, and the second end of the cooling liquid input pipeline is connected to the input port of the input pump (10).

5. The thermal management system of claim 1, wherein, The valve group comprises a three-way valve (7); The first output side is connected to the input end of the cooling liquid pipeline, the second output side is connected to the input end of the refrigeration pipeline, and the three-way valve (7) can control the input of the cooling liquid into the cooling liquid pipeline and / or the refrigeration pipeline.

6. The thermal management system of claim 1, wherein, The valve group comprises a first valve (11) and a second valve (12); The first valve (11) is connected to the input end of the cooling liquid pipeline, and the second valve (12) is connected to the input end of the refrigeration pipeline.

7. The thermal management system of claim 5, wherein, The second throttling member (8) comprises an expansion valve, or a combination of an electromagnetic valve and a capillary tube in series.

8. The thermal management system of claim 1, wherein, The heat driver (5) is a fan.

9. A control method for the heat management system according to any one of claims 1-8, characterized in that, The control method comprises the following steps: The temperature difference is the difference between the temperature of the cooled cooling liquid and the ambient temperature; When the heat management system is in the case of ambient temperature ≤ cooling liquid temperature to be cooled - temperature difference, the first output side of the valve group is fully opened; The cooling liquid to be cooled is cooled by adjusting the output power of the heat driver (5); When the heat management system is in the case of the difference between the cooling liquid temperature to be cooled and the temperature difference < ambient temperature < cooling liquid temperature to be cooled, the opening of the first output side of the valve group is adjustable, the opening of the second output side is adjustable, and the opening of the second throttling member (8) is adjustable; The cooling liquid to be cooled is cooled by adjusting the output power of the compressor (1) and adjusting the output power of the heat driver (5); When the heat management system is in the case of ambient temperature ≥ cooling liquid temperature to be cooled, the second output side of the valve group is fully opened, the opening of the first output side is adjustable, and the opening of the second throttling member (8) is adjustable; The cooling liquid to be cooled is cooled by adjusting the output power of the compressor (1).

10. A control method for the heat management system according to claim 2, characterized in that, When the heat management system is in the case of the difference between the cooling liquid temperature to be cooled and the temperature difference < ambient temperature < cooling liquid temperature to be cooled, the opening of the first output side of the valve group is adjustable, the opening of the second output side is adjustable, the opening of the second throttling member (8) is adjustable, and the opening of the third throttling member (9) is adjustable; When the heat management system is in the case of ambient temperature ≥ cooling liquid temperature to be cooled, the second output side of the valve group is fully opened, the opening of the first output side is adjustable, the opening of the second throttling member (8) is adjustable, and the opening of the third throttling member (9) is adjustable.

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