A temperature control system

Abstract

The present invention discloses a temperature control system, which includes a compressor refrigeration module, a refrigerant module, a cooling medium refrigeration module and a control module; the compressor refrigeration module includes a compressor refrigeration unit and a dual-system heat exchanger, and the dual-system heat exchanger includes a first heat exchange channel, a second heat exchange channel and a third heat exchange channel; the cooling medium inlet is connected to the inlet of the first heat exchange channel through a first switch valve, and the compressor refrigeration unit is connected to the second heat exchange channel to form a refrigerant circuit; the refrigerant module is connected to the third heat exchange channel to form a refrigerant circuit, and the control module is used to obtain the required temperature. When the required temperature is greater than the preset temperature, the compressor refrigeration unit is controlled to stop running, the first switch valve and the second switch valve are controlled to open, and the valve opening of the first switch valve is adjusted based on the required temperature to adjust the inlet flow of the cooling medium. By adopting the above scheme, the problem of high energy consumption of the existing temperature control system is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy, and in particular to a temperature control system. Background Art

[0002] At present, when testing new energy batteries, a temperature control system is usually required to control the temperature.

[0003] The existing temperature control system includes a compressor refrigeration unit and a heating device. The compressor refrigeration unit cools down the heat transfer medium, and the heating device heats up the heat transfer medium to control the temperature of the heat transfer medium. The heat transfer medium then exchanges heat with the battery pack or the load to achieve temperature control. However, the existing temperature control system has high energy consumption. Summary of the invention

[0004] The invention provides a temperature control system to solve the problem of high energy consumption of the existing temperature control system.

[0005] According to one aspect of the present invention, there is provided a temperature control system, the temperature control system comprising a compressor refrigeration module, a refrigerant module, a cooling medium refrigeration module and a control module;

[0006] The compressor refrigeration module includes a compressor refrigeration unit and a dual-system heat exchanger, the dual-system heat exchanger includes a first heat exchange channel, a second heat exchange channel and a third heat exchange channel, the third heat exchange channel is used to exchange heat with the first heat exchange channel and the second heat exchange channel;

[0007] The cooling medium refrigeration system comprises a cooling medium inlet, a cooling medium outlet, a first switch valve and a second switch valve, wherein the cooling medium inlet is connected to the inlet of the first heat exchange channel through the first switch valve, and the outlet of the first heat exchange channel is connected to the cooling medium outlet through the second switch valve; the compressor refrigeration unit is connected to the second heat exchange channel to form a refrigerant circuit; the secondary refrigerant module is connected to the third heat exchange channel to form a secondary refrigerant circuit, and the secondary refrigerant is used to exchange heat with the load;

[0008] The control module is electrically connected to the compressor refrigeration unit, the first switch valve and the second switch valve. The control module is used to obtain the required temperature. When the required temperature is greater than the preset temperature, the compressor refrigeration unit is controlled to stop running, the first switch valve and the second switch valve are controlled to open, and the valve opening of the first switch valve is adjusted based on the required temperature to adjust the inlet flow of the cooling medium.

[0009] In an optional embodiment of the present invention, the inlet of the first heat exchange channel is higher than the outlet of the first heat exchange channel.

[0010] In an optional embodiment of the present invention, the control module is specifically used to: when the required temperature is less than or equal to the preset temperature, control the compressor refrigeration unit to operate, and control the first switch valve and the second switch valve to close in turn.

[0011] In an optional embodiment of the present invention, the first switch valve includes an electric regulating valve, and the control module is specifically used to adjust the valve opening of the electric regulating valve through a fuzzy PID algorithm to adjust the inlet flow rate of the cooling medium.

[0012] In an optional embodiment of the present invention, the brine module includes a first temperature detection component, a brine outlet and a brine inlet, wherein the brine outlet is used to output the brine to exchange heat with the load, and the brine inlet is used to allow the brine after heat exchange to flow in;

[0013] The first temperature detection element is used to detect the liquid supply temperature of the coolant outlet;

[0014] The control module is specifically used to adjust the valve opening of the first switch valve based on the required temperature and the liquid supply temperature to adjust the inlet flow rate of the cooling medium.

[0015] In an optional embodiment of the present invention, the coolant module further includes a heating device, a liquid storage device, an internal circulation pump and an external circulation pump;

[0016] The liquid storage device, the internal circulation pump and the third heat exchange channel are connected by a pipeline to form a coolant internal circulation loop;

[0017] The output port of the liquid storage device is connected to the coolant outlet via the external circulation pump, and the coolant inlet is connected to the input port of the liquid storage device;

[0018] The first temperature detection element is connected between the output port of the liquid storage device and the external circulation pump;

[0019] The heating device is connected to the liquid storage device, and the heating device is used to heat the coolant inside the liquid storage device;

[0020] The control module is specifically used to: obtain the working status of the heating device, when the working status of the heating device is started, obtain the current power of the heating device, adjust the valve opening of the first switch valve based on the current power, the required temperature and the liquid supply temperature, when the working status of the heating device is stopped, adjust the valve opening of the first switch valve based on the required temperature and the liquid supply temperature.

[0021] In an optional embodiment of the present invention, the coolant module further includes at least one of the following:

[0022] an expansion tank and a one-way valve, wherein the expansion tank is connected to the liquid storage device through the one-way valve;

[0023] a second temperature detection member, the second temperature detection member being in communication with the coolant inlet and being used for detecting a return liquid temperature;

[0024] A flow meter connected between the coolant inlet and the input port of the liquid storage device;

[0025] a first pressure detection member connected between the coolant inlet and the input port of the liquid storage device;

[0026] A second pressure detection component is connected between the external circulation pump and the refrigerant outlet.

[0027] In an optional embodiment of the present invention, the compressor refrigeration unit includes a compressor, a condenser, an expansion valve, a drying filter, a first liquid storage tank and a regenerator, and the compressor, the condenser, the expansion valve, the drying filter, the first liquid storage tank, the regenerator and the second heat exchange channel are connected by a pipeline to form a refrigerant circuit;

[0028] The control module is used to control the compressor to stop when the required temperature is greater than a preset temperature.

[0029] In an optional embodiment of the present invention, the condenser includes a fourth heat exchange channel and a fifth heat exchange channel, and the fourth heat exchange channel is connected to the refrigerant circuit for the flow of refrigerant;

[0030] One end of the fifth heat exchange channel is communicated with the cooling medium inlet, and the other end of the fifth heat exchange channel is communicated with the cooling medium outlet, so that the cooling medium in the fifth heat exchange channel exchanges heat with the refrigerant in the fourth heat exchange channel.

[0031] In an optional embodiment of the present invention, the cooling medium includes one of cooling water and chilled water, and the chilled water includes an ethylene glycol aqueous solution; and / or,

[0032] The cooling medium refrigeration module further includes a third temperature detection element, which is used to detect the cooling medium temperature at the cooling medium inlet. The preset temperature is the sum of the cooling medium temperature and a preset temperature difference, and the preset temperature difference is greater than 2°C.

[0033] The technical solution of the embodiment of the present invention is to set a compressor refrigeration module, a refrigerant module, a cooling medium refrigeration module and a control module, and the compressor refrigeration module includes a compressor refrigeration unit and a dual-system heat exchanger, and the dual-system heat exchanger can make the refrigerant exchange heat with the refrigerant or the cooling medium. The control module is used to obtain the required temperature. When the required temperature is greater than the preset temperature, the compressor refrigeration unit is controlled to stop running, and the first switch valve and the second switch valve are controlled to open, so as to adjust the temperature of the refrigerant through the cooling medium, and adjust the valve opening of the first switch valve based on the required temperature to adjust the inlet flow of the cooling medium to achieve the temperature control of the refrigerant. Therefore, when the temperature is high, that is, when the required temperature is greater than the preset temperature, the compressor refrigeration unit is shut down, and only the cooling medium participates in the refrigeration temperature control. Compared with the compressor refrigeration unit in the related art to realize temperature control by full operation, the present invention reduces the power consumption of the compressor refrigeration unit, thereby reducing the energy consumption of the entire temperature control system, and achieving the purpose of energy saving. At the same time, although the refrigeration system adds a cooling medium refrigeration module, only two parts, the first switch valve and the second switch valve, are added, which effectively reduces energy consumption with limited cost increase. The problem of high energy consumption of the existing temperature control system is solved.

[0034] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A schematic diagram of the structure of a temperature control system provided by an embodiment of the present invention;

[0037] Figure 2 A circuit block diagram of a temperature control system provided by an embodiment of the present invention;

[0038] Figure 3 It is a circuit block diagram of another temperature control system provided by an embodiment of the present invention.

[0039] Wherein: 1. compressor refrigeration module; 11. dual system heat exchanger; 12. compressor refrigeration unit; 121. compressor; 122. condenser; 123. expansion valve; 124. drying filter; 125. first liquid storage tank; 126. regenerator; 127. third pressure detection element; 128. fourth pressure detection element; 2. refrigerant module; 21. first temperature detection element; 22. heating device; 23. liquid storage device; 24. internal circulation pump; 25. external circulation pump; 26. one-way valve; 27. second temperature detection element; 28. flow meter; 29. ​​first pressure detection element; 210. second pressure detection element; 211. liquid filling port; 212. expansion tank; 3. cooling medium refrigeration module; 31. cooling medium inlet; 32. cooling medium outlet; 33. first switch valve; 34. second switch valve; 35. third temperature detection element; 4. control module; 5. load heat exchange device. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] Figure 1 The following is a schematic diagram of a temperature control system provided by an embodiment of the present invention. Figure 1 and Figure 2As shown, the temperature control system includes a compressor refrigeration module 1, a refrigerant module 2, a cooling medium refrigeration module 3 and a control module 4; wherein the compressor refrigeration module 1 is a module that utilizes the phase change and heat absorption and release phenomenon of the refrigerant during the compression, condensation, throttling and evaporation processes to achieve a refrigeration effect. The refrigerant module 2 is a module that adjusts the refrigerant to a suitable temperature to output to the load to meet the temperature requirement of the load. The cooling medium refrigeration module 3 is a module that realizes refrigeration of the refrigerant by exchanging heat between a low-temperature cooling medium and the refrigerant. The control module 4 refers to a functional module for performing logic control. In some embodiments, the control module 4 includes any one of programmable devices such as MCU, PLC, FPGA, DSP, etc.

[0043] The compressor refrigeration module 1 includes a compressor refrigeration unit 12 and a dual-system heat exchanger 11. The compressor refrigeration unit 12 is a unit that uses the phase change and heat absorption and release phenomenon of the refrigerant during the compression, condensation, throttling and evaporation processes to achieve a refrigeration effect. The dual-system heat exchanger 11 includes a first heat exchange channel, a second heat exchange channel and a third heat exchange channel. The third heat exchange channel is used to exchange heat with the first heat exchange channel and the second heat exchange channel; wherein, the dual-system heat exchanger 11 uses the principle of heat conduction to transfer heat between fluids of different temperatures through heat conduction. Heat conduction refers to the physical phenomenon that the heat inside an object is transferred from a high-temperature object to a low-temperature object so that the two objects reach thermal equilibrium. Therefore, the fluids in the first heat exchange channel, the second heat exchange channel and the third heat exchange channel can exchange heat.

[0044] The cooling medium refrigeration system includes a cooling medium inlet 31, a cooling medium outlet 32, a first switch valve 33 and a second switch valve 34. The cooling medium inlet 31 is connected to the inlet of the first heat exchange channel through the first switch valve 33, and the outlet of the first heat exchange channel is connected to the cooling medium outlet 32 ​​through the second switch valve 34; the compressor refrigeration unit 12 is connected to the second heat exchange channel to form a refrigerant circuit; the refrigerant module 2 is connected to the third heat exchange channel to form a refrigerant circuit, and the refrigerant is used to exchange heat with the load.

[0045] The first switch valve 33 and the second switch valve 34 are valves capable of controlling the on-off of the pipeline. Preferably,

[0046] The second switch valve 34 includes a solenoid valve. When the first switch valve 33 and the second switch valve 34 are opened, the cooling medium entering the cooling medium inlet 31 can flow through the first heat exchange channel and the refrigerant inside the third heat exchange channel to exchange heat to cool the refrigerant. When the compressor refrigeration unit 12 is running, the refrigerant will flow to the refrigerant inside the second heat exchange channel and the third heat exchange channel to exchange heat to cool the refrigerant. In practical applications, the temperature control system may have a load heat exchange device 5 for controlling the temperature of the load. After the refrigerant temperature is adjusted to a suitable temperature by the refrigerant module 2, the refrigerant is output to the load heat exchange device 5 to absorb the heat generated by the load or provide heat to achieve temperature control of the load. In some embodiments, the load heat exchange device 5 may be a component that can perform heat exchange, such as a heat exchange plate. In some embodiments, the load is a battery. It can be understood that in other embodiments, the load may be other components that require temperature control, which are not specifically limited here.

[0047] The control module 4 is electrically connected to the compressor refrigeration unit 12, the first switch valve 33 and the second switch valve 34. The control module 4 is used to obtain the required temperature. When the required temperature is greater than the preset temperature, the compressor refrigeration unit 12 is controlled to stop running, the first switch valve 33 and the second switch valve 34 are controlled to open, and the valve opening of the first switch valve 33 is adjusted based on the required temperature to adjust the inlet flow of the cooling medium. Among them, the required temperature refers to the temperature that the refrigerant needs to reach, and the preset temperature refers to the temperature threshold preset by the user. In some embodiments, the preset temperature is positively correlated with the temperature of the cooling medium entering the cooling medium inlet 31. The inlet flow of the cooling medium refers to the flow of the cooling medium when it enters from the cooling medium inlet 31.

[0048] When the compressor refrigeration unit 12 stops running, the refrigerant is cooled by heat exchange with the cooling medium. When other conditions are fixed, when the incoming flow rate of the cooling medium is different, the degree of heat exchange and cooling of the refrigerant by the cooling medium is different. When the incoming flow rate of the cooling medium is larger, the heat exchange between the cooling medium and the refrigerant is higher, so the temperature of the refrigerant after heat exchange with the cooling medium is lower. When the incoming flow rate of the cooling medium is smaller, the heat exchange between the cooling medium and the refrigerant is smaller, so the temperature of the refrigerant after heat exchange with the cooling medium is higher. At the same time, the valve opening of the first switch valve 33 will affect the incoming flow rate of the cooling medium. The larger the valve opening, the larger the incoming flow rate of the cooling medium. The smaller the valve opening, the smaller the incoming flow rate of the cooling medium. Therefore, the incoming flow rate of the cooling medium can be adjusted by adjusting the valve opening of the first switch valve 33, and then the temperature of the refrigerant can be adjusted so that the temperature of the refrigerant is basically the same as the required temperature, thereby achieving temperature control.

[0049] The above scheme is provided with a compressor refrigeration module 1, a refrigerant module 2, a cooling medium refrigeration module 3 and a control module 4. The compressor refrigeration module 1 includes a compressor refrigeration unit 12 and a dual-system heat exchanger 11. The dual-system heat exchanger 11 can make the refrigerant exchange heat with the refrigerant or the cooling medium. The control module 4 is used to obtain the required temperature. When the required temperature is greater than the preset temperature, the compressor refrigeration unit 12 is controlled to stop running, and the first switch valve 33 and the second switch valve 34 are controlled to open, so as to adjust the temperature of the refrigerant through the cooling medium, and adjust the valve opening of the first switch valve 33 based on the required temperature to adjust the inlet flow of the cooling medium to achieve the temperature control of the refrigerant. Therefore, when the temperature is high, that is, when the required temperature is greater than the preset temperature, the compressor refrigeration unit 12 is shut down, and only the cooling medium participates in the refrigeration temperature control. Compared with the related art in which the compressor refrigeration unit 12 is fully operated to achieve temperature control, the present invention reduces the power consumption of the compressor refrigeration unit 12, thereby reducing the energy consumption of the entire temperature control system, and achieving the purpose of energy saving. Meanwhile, although the cooling medium refrigeration module 3 is added to the refrigeration system, only two parts, the first switch valve 33 and the second switch valve 34, are added, which effectively reduces energy consumption with limited cost increase, thereby solving the problem of high energy consumption of the existing temperature control system.

[0050] In an optional embodiment of the present invention, Figure 1 and Figure 2 As shown, the inlet of the first heat exchange channel is higher than the outlet of the first heat exchange channel. In some embodiments, the outlet of the first heat exchange channel is located at the bottom of the dual-system heat exchanger 11. Therefore, when the compressor refrigeration unit 12 is used to cool the secondary coolant and the cooling medium is not needed to cool the secondary coolant, the cooling medium entering the first heat exchange channel can be discharged from the first heat exchange channel under the action of gravity, so as to avoid the compressor refrigeration unit 12 causing the cooling medium in the first heat exchange channel to freeze and damage the dual-system heat exchanger 11.

[0051] In an optional embodiment of the present invention, the control module 4 is specifically used to: when the required temperature is less than or equal to the preset temperature, control the compressor refrigeration unit 12 to operate, and sequentially control the first switch valve 33 and the second switch valve 34 to close. By sequentially controlling the first switch valve 33 and the second switch valve 34 to close, that is, first closing the first switch valve 33 and then closing the second switch valve 34, rather than closing the first switch valve 33 and the second switch valve 34 at the same time, the cooling medium entering the first heat exchange channel can be discharged from the first heat exchange channel under the action of gravity, and then discharged from the cooling medium outlet 32, avoiding the temperature control system from freezing the cooling medium inside the first heat exchange channel when using low temperature, resulting in freezing of the dual system heat exchanger 11.

[0052] In an optional embodiment of the present invention, the first switch valve 33 includes an electric regulating valve, which can accurately adjust the flow of the cooling medium entering the dual-system heat exchanger 11, thereby ensuring the stability of the heat exchange temperature. The control module 4 is specifically used to: adjust the valve opening of the electric regulating valve through a fuzzy PID algorithm to adjust the incoming flow of the cooling medium. Among them, the fuzzy PID algorithm uses fuzzy logic and optimizes the parameters of the PID in real time according to certain fuzzy rules to overcome the disadvantage that the traditional PID parameters cannot adjust the PID parameters in real time. The valve opening of the first switch valve 33 is adjusted according to the required temperature through the fuzzy PID algorithm to adjust the incoming flow of the cooling medium, so that the refrigeration capacity obtained by the coolant can be accurately adjusted to achieve a higher control accuracy.

[0053] In an optional embodiment of the present invention, Figure 1 and Figure 3 As shown, the coolant module 2 includes a first temperature detection component 21, a coolant outlet and a coolant inlet. The coolant outlet is used to output the coolant to exchange heat with the load, and the coolant inlet is used to allow the coolant after heat exchange to flow in. In some embodiments, the coolant inlet and the coolant outlet are connected by a pipeline, and a load heat exchange device 5 for controlling the temperature of the load may be provided between the coolant inlet and the coolant outlet. The coolant flowing out of the coolant outlet passes through the load heat exchange device 5 and flows back from the coolant inlet to the coolant circuit. The coolant absorbs the heat generated by the load or provides heat to achieve temperature control of the load.

[0054] The first temperature detection member 21 is used to detect the supply temperature of the coolant outlet. Specifically, the first temperature detection member 21 includes a temperature sensor, so that the temperature value can be accurately detected. The supply temperature is the temperature of the coolant output to the load for heat exchange and temperature control. The control module 4 is electrically connected to the first temperature detection member 21. The control module 4 is specifically used to: adjust the valve opening of the first switch valve 33 based on the required temperature and the supply temperature to adjust the inlet flow of the cooling medium so that the difference between the required temperature and the supply temperature is less than the preset difference, that is, the required temperature and the supply temperature are basically the same. Among them, the preset difference reflects the accuracy of temperature control, so the preset difference can be set according to demand. The required temperature reflects the temperature that needs to be reached when the coolant is output, and the supply temperature reflects the actual temperature of the current coolant output. The deviation between the two reflects the degree of adjustment of the inlet flow of the cooling medium, so the valve opening of the first switch valve 33 can be adjusted based on the required temperature and the supply temperature to adjust the inlet flow of the cooling medium so that the final required temperature and the supply temperature are basically the same.

[0055] Specifically, the control module 4 includes a fuzzy PID controller, and the required temperature and the liquid supply temperature are used as the input of the fuzzy PID controller, and the valve opening is used as the output of the fuzzy PID controller, so that the inlet flow of the cooling medium can be accurately adjusted to achieve a higher control accuracy. In some embodiments, the inlet flow of the cooling medium can also be directly used as the output of the fuzzy PID controller, and then the valve opening of the first switch valve 33 is adjusted according to the relationship between the valve opening of the first switch valve 33 and the inlet flow of the cooling medium obtained by testing in advance. This is not specifically limited here, but is just an example.

[0056] In an optional embodiment of the present invention, Figure 1 and Figure 3 As shown, the coolant module 2 also includes a heating device 22, a liquid storage device 23, an internal circulation pump 24 and an external circulation pump 25; the liquid storage device 23, the internal circulation pump 24 and the third heat exchange channel are connected by a pipeline to form a coolant internal circulation loop, so the coolant after heat exchange and cooling with the refrigerant or cooling medium in the third heat exchange channel can flow back to the liquid storage device 23. Preferably, the liquid storage device 23 includes a second liquid storage tank, which is a tank body capable of storing the coolant.

[0057] The heating device 22 is connected to the liquid storage device 23, and the heating device 22 is used to heat the coolant inside the liquid storage device 23, wherein the heating device 22 refers to a device that can convert other energy into thermal energy to heat the coolant inside the liquid storage device 23, and preferably, the heating device 22 includes a heater, and the heater can convert electrical energy into thermal energy to heat the coolant. Since the coolant after heat exchange and cooling with the refrigerant or cooling medium in the third heat exchange channel may be lower than the required temperature, the coolant is heated by the heating device 22 at this time, and the temperature of the coolant inside the liquid storage device 23 can be adjusted to the required temperature.

[0058] The output port of the liquid storage device 23 is connected to the coolant outlet through the external circulation pump 25, and the coolant inlet is connected to the input port of the liquid storage device 23. Therefore, the coolant with a suitable temperature inside the liquid storage device 23 can be discharged from the coolant outlet under the power of the external circulation pump 25 to achieve load temperature control.

[0059] The first temperature detection element 21 is connected between the output port of the liquid storage device 23 and the external circulation pump 25 , so that the first temperature detection element 21 can monitor the supply liquid temperature of the coolant outlet.

[0060] The control module 4 is specifically used to: obtain the working state of the heating device 22, when the working state of the heating device 22 is started, obtain the current power of the heating device 22, adjust the valve opening of the first switch valve 33 based on the current power, the required temperature and the supply temperature, and when the working state of the heating device 22 is stopped, adjust the valve opening of the first switch valve 33 based on the required temperature and the supply temperature. Among them, the current power of the heating device 22 refers to the power of the heating device 22 at the current moment. The greater the power of the heating device 22, the more heat is generated, and the more the temperature of the coolant inside the liquid storage device 23 is increased. The smaller the power of the heating device 22, the smaller the heat is generated, and the smaller the temperature of the coolant inside the liquid storage device 23 is increased. When the coolant is cooled by the cooling medium refrigeration module 3, the degree of cooling of the coolant depends on the inlet flow rate of the cooling medium. Therefore, when the heating device 22 is turned on, the final supply temperature of the coolant depends on both the current power of the heating device 22 and the inlet flow rate of the cooling medium.

[0061] By adjusting the valve opening of the first switch valve 33 based on the current power, required temperature and liquid supply temperature when the working state of the heating device 22 is started, and adjusting the valve opening of the first switch valve 33 based on the required temperature and liquid supply temperature when the working state of the heating device 22 is stopped, the liquid supply temperature can be accurately adjusted in different situations to make it basically the same as the required temperature, thereby achieving precise temperature control.

[0062] In an optional embodiment of the present invention, Figure 1 and Figure 3 As shown, the coolant module 2 also includes an expansion tank 212 and a one-way valve 26. The inlet of the expansion tank 212 is connected to the liquid storage device 23, and the outlet of the expansion tank 212 is connected to the liquid storage device 23 through the one-way valve 26. The top of the expansion tank 212 is provided with a liquid filling port 211. The working principle of the expansion tank 212 is as follows: when the fluid with pressure from the outside enters the airbag of the expansion tank 212, the nitrogen sealed in the tank is compressed. According to Boyle's gas law, the volume of the gas decreases and the pressure increases after being compressed, until the gas pressure in the expansion tank 212 reaches the same pressure as the fluid pressure, and the fluid stops entering. When the fluid loss pressure decreases, the gas pressure in the expansion tank 212 is greater than the pressure of the fluid. At this time, the gas expands to squeeze the fluid in the airbag to replenish the liquid storage device 23. By setting the expansion tank 212 and the one-way valve 26, it is possible to prevent the pressure of the coolant module 2 from rising too fast, and ensure the stability of the pressure of the coolant module 2.

[0063] Preferably, the coolant module 2 further includes a liquid level detection component, which is in communication with the expansion tank 212 and is used to detect the liquid level of the expansion tank 212. In some embodiments, the liquid level detection component is specifically a liquid level meter.

[0064] In an optional embodiment of the present invention, Figure 1and Figure 3 As shown, the coolant module 2 also includes a second temperature detection member 27, which is connected to the coolant inlet and is used to detect the return liquid temperature. Preferably, the second temperature detection member 27 is a temperature sensor, so that the temperature of the coolant returned from the coolant inlet to the liquid storage device 23 can be monitored, that is, the return liquid temperature.

[0065] In an optional embodiment of the present invention, the brine module 2 further includes a flow meter 28, which is connected between the brine inlet and the input port of the liquid storage device 23. Thus, the flow rate of the brine when entering from the brine inlet can be monitored.

[0066] In an optional embodiment of the present invention, Figure 1 and Figure 3 As shown, the refrigerant module 2 also includes a first pressure detection component 29, which is connected between the refrigerant inlet and the input port of the liquid storage device 23; preferably, the first pressure detection component 29 includes a pressure sensor, so that the pressure of the refrigerant entering the refrigerant inlet can be easily detected to prevent the pipeline from being damaged due to excessive pressure.

[0067] In an optional embodiment of the present invention, Figure 1 and Figure 3 As shown, the coolant module 2 also includes a second pressure detection member 210, which is connected between the external circulation pump 25 and the coolant outlet. Preferably, the second pressure detection member 210 includes a pressure sensor, so that the pressure of the coolant output from the coolant outlet can be easily detected to prevent the pipeline from being damaged due to excessive pressure.

[0068] The working principle of the coolant module 2 is described below. In this embodiment, the load is a battery. A coolant is added to the expansion tank 212, enters the liquid storage device 23, is heated by the heating device 22, and is transported by the internal circulation pump 24. The coolant is exchanged with the refrigerant in the compressor refrigeration module 1 or the cooling medium in the cooling medium refrigeration module 3 through the dual-system heat exchanger 11. The cooling capacity is provided by the refrigerant or the cooling medium. The cooling capacity is then provided by the heating device 22. The internal circulation reaches a balance, and the temperature in the liquid storage device 23 reaches the required temperature, that is, the liquid supply temperature reaches the required temperature. The liquid is transported to the client via the external circulation pump 25 to absorb the heat continuously generated during the battery charging or discharging test or to provide heat, and to ensure that the temperature and flow rate of the coolant at the coolant outlet are constant during the entire test process, and are controlled with high precision to meet the requirements of constant cooling conditions during continuous battery testing.

[0069] In an optional embodiment of the present invention, Figure 1 and Figure 3As shown, the compressor refrigeration unit 12 includes a compressor 121, a condenser 122, an expansion valve 123, a drying filter 124, a first liquid storage tank 125 and a heat regenerator 126. The compressor 121, the condenser 122, the expansion valve 123, the drying filter 124, the first liquid storage tank 125, the heat regenerator 126 and the second heat exchange channel are connected by a pipeline to form a refrigerant circuit. The refrigerant flows in the refrigerant circuit, constantly changing its state, and exchanges heat with the coolant in the third heat exchange channel in the second heat exchange channel of the dual-system heat exchanger 11 to achieve the purpose of refrigeration. The low-pressure refrigerant vapor generated in the regenerator 126 is first sucked into the compressor 121 and adiabatically compressed to the condensing pressure, and then enters the condenser 122, where it is cooled and condenses the high-pressure liquid. The refrigerant liquid is adiabatically expanded through the expansion valve 123, and the pressure is reduced to the evaporation pressure. At the same time, the temperature is reduced to the evaporation temperature, and it becomes a gas-liquid two-phase mixture. Then, after passing through the regenerator 126, it enters the second heat exchange channel of the dual system heat exchanger 11, absorbs the heat of the refrigerant in the third heat exchange channel of the dual system heat exchanger 11 at a low temperature, evaporates into vapor, and is sucked into the compressor 121, and the cycle starts again. In the entire refrigeration process, the function of the refrigeration system is to reduce the temperature of the refrigerant in the third heat exchange channel of the dual system heat exchanger 11.

[0070] The control module 4 is electrically connected to the compressor 121, and is used to control the compressor 121 to stop when the required temperature is greater than the preset temperature. At this time, only the cooling medium needs to be used to cool the secondary coolant, and energy consumption is reduced.

[0071] On the basis of the above embodiment, the condenser 122 includes a fourth heat exchange channel and a fifth heat exchange channel, the fourth heat exchange channel is connected to the refrigerant circuit for the refrigerant to flow; one end of the fifth heat exchange channel is connected to the cooling medium inlet 31, and the other end of the fifth heat exchange channel is connected to the cooling medium outlet 32, so that the cooling medium in the fifth heat exchange channel exchanges heat with the refrigerant in the fourth heat exchange channel. Therefore, the refrigerant flowing into the fourth heat exchange channel of the condenser 122 can exchange heat with the cooling medium for cooling, so the cooling medium source of the compressor refrigeration module 1 and the cooling medium refrigeration module 3 is the same, and the same pipeline is used for water supply, which reduces the complexity of the pipeline design.

[0072] In an optional embodiment of the present invention, Figure 1 and Figure 3 As shown, the compressor refrigeration unit 12 further includes a third pressure detection member 127, which is disposed between the regenerator 126 and the compressor 121 and is used to detect the pressure of the refrigerant entering the compressor 121. Preferably, the third pressure detection member 127 includes a pressure sensor.

[0073] In an optional embodiment of the present invention, the compressor refrigeration unit 12 further includes a fourth pressure detection member 128, which is disposed between the compressor 121 and the condenser 122 and is used to detect the pressure of the refrigerant output by the compressor 121. Preferably, the fourth pressure detection member 128 includes a pressure sensor.

[0074] In an optional embodiment of the present invention, the cooling medium includes one of cooling water and chilled water, and the chilled water includes an ethylene glycol aqueous solution. Preferably, the temperature range of the ethylene glycol aqueous solution is -30°C to 0°C. Preferably, the temperature of the ethylene glycol aqueous solution is -20°C. Among them, the operating temperature of cooling water is usually above the ambient temperature, and chilled water needs to work at a sub-zero temperature, that is, the temperature of the chilled water is lower than 0°C. Therefore, a suitable cooling medium can be selected according to the temperature range of the temperature control system, and the specific composition of the cooling medium is not specifically limited here. It is understandable that in other embodiments, the ethylene glycol aqueous solution can also be other temperatures or other types of cooling media can be selected, and the specific type of the cooling medium is not specifically limited here.

[0075] In an optional embodiment of the present invention, Figure 1 and Figure 3 As shown, the cooling medium refrigeration module 3 further includes a third temperature detection member 35, which is used to detect the cooling medium temperature of the cooling medium inlet 31. Specifically, the third temperature detection member 35 includes a temperature sensor. The third temperature detection member 35 is arranged on the pipeline between the cooling medium inlet 31 and the first switch valve 33, so that the temperature of the cooling medium entering from the cooling medium inlet 31 can be conveniently detected.

[0076] The preset temperature is the sum of the cooling medium temperature and the preset temperature difference, and the preset temperature difference is greater than 2°C. Preferably, the preset temperature difference is 3°C. The following is a specific example to illustrate how to set the preset temperature. In this embodiment, the temperature range of the temperature control system is -40 to 100°C, the cooling medium is an ethylene glycol aqueous solution at -10°C, and the preset temperature difference is 3°C. At this time, the preset temperature is (-10+3) = -7°C. Therefore, when the required temperature is greater than -7°C, the refrigerant is directly cooled by the ethylene glycol aqueous solution without starting the compressor refrigeration unit 12. In another embodiment, the preset temperature difference is 10°C, and the cooling medium is an ethylene glycol aqueous solution at -10°C. At this time, when the required temperature is greater than 0°C, the refrigerant is directly cooled by the ethylene glycol aqueous solution without starting the compressor refrigeration unit 12.

[0077] The principle of the present invention is explained below with a specific embodiment: the related technology mainly consists of a compressor refrigeration module 1 and a coolant module 2. During the entire temperature control process, the compressor 121 needs to be turned on all the time to achieve thermal balance with the internal electric heating of the equipment and the external battery pack to complete precise temperature control. The present invention is designed to add a set of cooling medium refrigeration module 3 to the temperature control system of the related technology. The cooling medium refrigeration module 3 consists of a first switch valve 33 and a second switch valve 34.

[0078] The cooling medium is directly introduced into the dual-system heat exchanger 11 through the cooling medium inlet 31. The dual-system heat exchanger 11 has a first heat exchange channel, a second heat exchange channel and a third heat exchange channel. The first heat exchange channel is connected to the cooling medium refrigeration module 3 for allowing the cooling medium to flow through. The second heat exchange channel is connected to the compressor refrigeration unit 12 for allowing the refrigerant to flow through. The third heat exchange channel is connected to the coolant module 2 for allowing the coolant to flow through.

[0079] When the client battery pack requires medium to high temperature, that is, the required temperature is greater than the preset temperature, which is the cooling medium temperature plus the preset temperature difference, the compressor refrigeration unit 12 stops working, opens the first switch valve 33 and the second switch valve 34, and the refrigerant is transported by the internal circulation pump 24, exchanges heat with the cooling medium through the dual-system heat exchanger 11, and the heat is taken away by the cooling medium, and then heated by the heating device 22, the internal circulation reaches a balance, and the liquid storage device 23 reaches the temperature that needs to be controlled, that is, the liquid supply temperature is basically the same as the required temperature, and the refrigerant is transported to the client battery pack via the external circulation pump 25. The first switch valve 33 is an electric regulating valve and adopts a fuzzy PID control algorithm. The opening of the first switch valve 33 is adjusted according to the required temperature and liquid supply temperature provided to adjust the water inlet flow rate, so that the refrigeration capacity obtained by the refrigerant can be accurately adjusted to achieve a higher control accuracy.

[0080] When the client battery pack requires a low temperature, that is, the required temperature is less than or equal to the preset temperature, the coolant is transported by the internal circulation pump 24, and exchanges heat with the refrigerant in the compressor refrigeration module 1 through the dual-system heat exchanger 11. The heat is taken away by the refrigerant in the dual-system heat exchanger 11, and then heated by the heating device 22. The temperature reaches equilibrium, and the liquid storage device 23 reaches the temperature that needs to be controlled, and is transported to the client battery pack via the external circulation pump 25. At this time, close the first switch valve 33 first and then the second switch valve 34. The cooling medium in the dual-system heat exchanger 11 will be emptied under the action of gravity. This prevents the cooling medium refrigeration module 3 from freezing the cooling medium on this side when using low temperature, causing the dual-system heat exchanger 11 to freeze.

[0081] At medium and high temperatures, the compressor refrigeration unit 12 stops running, and only the cooling medium participates in refrigeration temperature control. The power consumption of the compressor 121 is reduced compared to the original compressor refrigeration unit 12. At the same time, the heating device 22 that counteracts refrigeration does not need to output high power, and the energy consumption of the entire temperature control system is reduced. The lower the temperature of the cooling medium, the lower the lower limit of the temperature that the cooling medium refrigeration module 3 can use, the more time it can be turned on and used, and the more energy consumption of the entire temperature control system is reduced throughout the year.

[0082] Table 1: Comparison of theoretical values ​​of the present invention and the prior art under medium and high temperature test conditions

[0083]

[0084] Among them, the medium and high temperature test conditions in Table 1 refer to the temperature range in which the required temperature is greater than the preset temperature, and the temperature control and refrigeration are performed by the cooling medium refrigeration module 3. It can be seen from Table 1 that in the temperature range when the required temperature is greater than the preset temperature, the present invention can save 89%-99% of energy consumption compared with the related art, thereby effectively reducing energy consumption.

[0085] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0086] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A temperature control system, characterized in that: It includes a compressor refrigeration module, a refrigerant module, a cooling medium refrigeration module and a control module; The compressor refrigeration module includes a compressor refrigeration unit and a dual-system heat exchanger, the dual-system heat exchanger includes a first heat exchange channel, a second heat exchange channel and a third heat exchange channel, the third heat exchange channel is used to exchange heat with the first heat exchange channel and the second heat exchange channel; The cooling medium refrigeration module includes a cooling medium inlet, a cooling medium outlet, a first switch valve and a second switch valve, the cooling medium inlet is connected to the inlet of the first heat exchange channel through the first switch valve, and the outlet of the first heat exchange channel is connected to the cooling medium outlet through the second switch valve; the compressor refrigeration unit is connected to the second heat exchange channel to form a refrigerant circuit; the secondary refrigerant module is connected to the third heat exchange channel to form a secondary refrigerant circuit, and the secondary refrigerant is used to exchange heat with the load; The control module is electrically connected to the compressor refrigeration unit, the first switch valve and the second switch valve, and is used to obtain a required temperature. When the required temperature is greater than a preset temperature, the control module controls the compressor refrigeration unit to stop running, controls the first switch valve and the second switch valve to open, and adjusts the valve opening of the first switch valve based on the required temperature to adjust the inlet flow of the cooling medium; The brine module comprises a first temperature detection component, a brine outlet and a brine inlet, wherein the brine outlet is used to output the brine to exchange heat with the load, and the brine inlet is used to allow the brine after heat exchange to flow in; The first temperature detection element is used to detect the liquid supply temperature of the coolant outlet; The control module is specifically used to: adjust the valve opening of the first switch valve based on the required temperature and the liquid supply temperature to adjust the inlet flow of the cooling medium; The coolant module also includes a heating device, a liquid storage device, an internal circulation pump and an external circulation pump; The liquid storage device, the internal circulation pump and the third heat exchange channel are connected by a pipeline to form a coolant internal circulation loop; The output port of the liquid storage device is connected to the coolant outlet via the external circulation pump, and the coolant inlet is connected to the input port of the liquid storage device; The first temperature detection element is connected between the output port of the liquid storage device and the external circulation pump; The heating device is connected to the liquid storage device, and the heating device is used to heat the coolant inside the liquid storage device; The control module is specifically used to: obtain the working status of the heating device, when the working status of the heating device is started, obtain the current power of the heating device, adjust the valve opening of the first switch valve based on the current power, the required temperature and the liquid supply temperature, when the working status of the heating device is stopped, adjust the valve opening of the first switch valve based on the required temperature and the liquid supply temperature.

2. The temperature control system according to claim 1, characterized in that: The inlet of the first heat exchange channel is higher than the outlet of the first heat exchange channel.

3. The temperature control system according to claim 2, characterized in that: The control module is specifically used to: when the required temperature is less than or equal to the preset temperature, control the compressor refrigeration unit to operate, and control the first switch valve and the second switch valve to close in sequence.

4. The temperature control system according to any one of claims 1 to 3, characterized in that: The first switch valve includes an electric regulating valve, and the control module is specifically used to adjust the valve opening of the electric regulating valve through a fuzzy PID algorithm to adjust the inflow flow of the cooling medium.

5. The temperature control system according to claim 1, characterized in that: The secondary refrigerant module further includes at least one of the following: an expansion tank and a one-way valve, wherein the expansion tank is connected to the liquid storage device through the one-way valve; a second temperature detection member, the second temperature detection member being in communication with the coolant inlet and being used for detecting a return liquid temperature; A flow meter connected between the coolant inlet and the input port of the liquid storage device; a first pressure detection member connected between the coolant inlet and the input port of the liquid storage device; A second pressure detection component is connected between the external circulation pump and the refrigerant outlet.

6. The temperature control system according to any one of claims 1 to 3, characterized in that: The compressor refrigeration unit comprises a compressor, a condenser, an expansion valve, a drying filter, a first liquid storage tank and a regenerator, wherein the compressor, the condenser, the expansion valve, the drying filter, the first liquid storage tank, the regenerator and the second heat exchange channel are connected by pipelines to form a refrigerant circuit; The control module is used to control the compressor to stop when the required temperature is greater than a preset temperature.

7. The temperature control system according to claim 6, characterized in that: The condenser comprises a fourth heat exchange channel and a fifth heat exchange channel, wherein the fourth heat exchange channel is connected to the refrigerant circuit for refrigerant flow; One end of the fifth heat exchange channel is communicated with the cooling medium inlet, and the other end of the fifth heat exchange channel is communicated with the cooling medium outlet, so that the cooling medium in the fifth heat exchange channel exchanges heat with the refrigerant in the fourth heat exchange channel.

8. The temperature control system according to any one of claims 1 to 3, characterized in that: The cooling medium comprises one of cooling water and chilled water, wherein the chilled water comprises an ethylene glycol aqueous solution; and / or, The cooling medium refrigeration module further includes a third temperature detection element, which is used to detect the cooling medium temperature at the cooling medium inlet. The preset temperature is the sum of the cooling medium temperature and a preset temperature difference, and the preset temperature difference is greater than 2°C.

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