Energy storage temperature control system and control method

Abstract

The invention relates to the technical field of cooling-water machines, and particularly discloses an energy storage temperature control system and a control method. The energy storage temperature control system comprises a natural cooling system, a refrigerating system connected with the natural cooling system in parallel, a secondary refrigerant loop I, a secondary refrigerant loop II, a secondary refrigerant loop III, a liquid supplementing loop, an environment temperature testing assembly and a fan assembly used in cooperation with the natural cooling system and the refrigerating system. The refrigerating medium loop I is connected with the natural cooling system, the refrigerating system, the refrigerating medium loop III and the liquid supplementing loop. The secondary refrigerant loop II is connected with the secondary refrigerant loop III and the liquid supplementing loop. The refrigerating system and / or the natural cooling system can be automatically selected for heat dissipation according to actual working conditions and requirements, different liquid supply requirements of PACK heat dissipation and PCS heat dissipation can be considered at the same time, the two secondary refrigerant loops are relatively independent, and temperature adjustment can be conducted in a targeted mode.

Description

Technical Field

[0001] The present invention relates to the technical field of chillers, and more specifically, to an energy storage temperature control system and a control method. Background Art

[0002] As the energy density of energy storage systems increases, the requirements for the integration of temperature control devices themselves are also increasing. Space in energy storage cabinets is extremely valuable, and the miniaturization of supporting equipment means the possibility of increasing the number of battery cells, which means an advantage in the cost of electricity storage. Improving equipment integration and adopting efficient heat transfer are both important means.

[0003] In the existing PACK+PCS integrated fusion liquid cooling technology, the technical method adopted is that the PACK cooling system uses compressor cooling and heat dissipation, and the PCS cooling system uses dry cooler natural cooling and heat dissipation. The two systems are completely independent; Using the above method, in order to ensure normal use in high-temperature environments, the design size of the dry cooler in the PCS cooling system will be relatively large, which will cause the external dimensions of the energy storage liquid cooling system to increase significantly compared to the existing route; in low-temperature environments, the compressor in the PACK cooling system may have the problem of frequent start and stop, and the refrigeration power consumption is relatively high. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an energy storage temperature control system and a control method; The solution adopted by the present invention to solve the technical problem is: An energy storage temperature control system, comprising a natural cooling system, a refrigeration system connected in parallel with the natural cooling system, a refrigerant circuit I, a refrigerant circuit II, a refrigerant circuit III, a liquid replenishment circuit, an ambient temperature test component for ambient temperature testing, and a fan component used in conjunction with the natural cooling system and the refrigeration system; The refrigerant circuit I is connected to the natural cooling system, the refrigeration system, the refrigerant circuit III, and the liquid replenishment circuit respectively; The refrigerant circuit II is connected to the refrigerant circuit III and the liquid replenishment circuit respectively.

[0005] In some possible implementations, the refrigerant circuit I includes a liquid return line I and a liquid supply line I respectively connected to the refrigeration system; The liquid return pipeline I is connected to the coolant circuit III, the liquid replenishment circuit, and the natural cooling system respectively; The liquid supply pipeline I is connected to the coolant circuit III, the liquid replenishment circuit, and the natural cooling system respectively.

[0006] In some possible implementations, the liquid return pipeline I is provided with a three-way proportional valve I, a water pump I, an expansion tank I, a liquid return pressure sensor I, and a liquid return temperature sensor I, which are respectively connected to the natural cooling system and the refrigeration system; the three-way proportional valve I, the water pump I, and the expansion tank I are sequentially arranged in the opposite direction of the flow of the refrigerant in the liquid return pipeline I, and the liquid return pressure sensor I and the liquid return temperature sensor I are arranged on the side of the expansion tank I away from the water pump I; The connection point between the liquid replenishment circuit and the liquid return pipeline I is arranged between the water pump I and the expansion tank I; A heater, a three-way proportional valve II connected to a coolant circuit III, a safety valve I connected to a liquid replenishment circuit, a liquid supply pressure sensor I and a liquid supply temperature sensor I are arranged on the liquid supply pipeline I; the heater, the three-way proportional valve II and the safety valve I are arranged in sequence along the flow direction of the coolant in the liquid supply pipeline I, and the liquid supply pressure sensor I and the liquid supply temperature sensor are arranged on the side of the safety valve I away from the three-way proportional valve II.

[0007] In some possible implementations, the refrigerant circuit III includes an evaporator II connected to the return liquid pipeline I and a three-way proportional valve II respectively; the connection point between the evaporator II and the return liquid pipeline I is arranged on the side of the expansion tank I away from the water pump I.

[0008] In some possible implementations, the refrigerant circuit II includes a liquid return line II and a liquid supply line II respectively connected to the evaporator II; The liquid return pipeline II and the liquid supply pipeline II are respectively connected to the liquid replenishment circuit.

[0009] In some possible implementations, a water pump II, an expansion tank II, a liquid return pressure sensor II and a liquid return temperature sensor II are sequentially arranged on the liquid return pipeline II; The liquid supply pipeline II is provided with a safety valve II connected to the liquid replenishment circuit, a liquid supply pressure sensor II and a liquid supply temperature sensor II.

[0010] In some possible embodiments, the fluid replenishment circuit includes an automatic fluid replenishment pipeline connected to the return fluid pipeline I, the supply fluid pipeline I, the return fluid pipeline II, and the supply fluid pipeline II, respectively, and a manual fluid replenishment pipeline connected to the return fluid pipeline I and the return fluid pipeline II, respectively.

[0011] In some possible implementations, the automatic liquid replenishment pipeline includes a liquid storage tank storing a coolant, a pipeline I connected to a liquid return pipeline I and a liquid return pipeline II, respectively, a pipeline II connected to a liquid supply pipeline II, and a pipeline III connected to a liquid supply pipeline I; the pipeline I, pipeline II, and pipeline III are respectively connected to the liquid storage tank; The pipeline Ⅰ includes a main pipe provided with a water pump Ⅲ and a three-way proportional valve Ⅲ, a branch pipe Ⅰ connected to the three-way proportional valve Ⅲ and the liquid return line Ⅰ, and a branch pipe Ⅱ connected to the three-way proportional valve Ⅲ and the liquid return line Ⅱ; check valves are provided on the branch pipes Ⅰ and Ⅱ; The manual liquid replenishment pipeline includes a liquid replenishment pipeline, a bypass I connected to the liquid replenishment pipeline and the liquid return pipeline I, and a bypass II connected to the liquid replenishment pipeline and the liquid return pipeline II; ball valves are respectively arranged on the bypass I and the bypass II.

[0012] In some possible implementations, the refrigeration system includes a condenser, a compressor connected to the condenser, and an evaporator I connected to the condenser and the compressor respectively; the evaporator I is connected to a natural cooling system and a refrigerant circuit I; The natural cooling system includes a natural cooling radiator connected to the coolant circuit I.

[0013] A control method for an energy storage temperature control system according to the above-mentioned method specifically comprises the following steps: When the ambient temperature is greater than the ambient temperature threshold I, the refrigeration system is turned on, the natural cooling system is turned off, and the refrigerant enters the refrigeration system; When the ambient temperature is lower than the ambient temperature threshold II, the refrigeration system is turned off, the natural cooling system is turned on, and the refrigerant enters the natural cooling radiator; When the ambient temperature is between the ambient temperature threshold Ⅰ and the threshold Ⅱ, the refrigeration system and the natural cooling system are turned on at the same time, and the refrigerant flows through the evaporator Ⅰ and the natural cooling radiator at the same time; When the supply pressure of the coolant circuit I is higher than the preset value, the safety valve I opens to release the pressure, and the excess coolant flows into the liquid storage tank; When the liquid supply pressure of the coolant circuit I is lower than the preset value, the coolant in the liquid storage tank flows through the water pump III, the three-way proportional valve III, and the check valve on the branch I to the inlet of the water pump I; When the supply pressure of the coolant circuit II is higher than the preset value, the safety valve II opens to release the pressure, and the excess coolant flows into the liquid storage tank through the pipeline; When the supply pressure of the coolant circuit II is lower than the preset value, the water pump III is turned on, and the coolant in the storage tank flows through the water pump III, the three-way proportional valve III, and the check valve on the branch II to the inlet of the water pump II; When the refrigerant in the refrigerant circuit I has a temperature control requirement, and the refrigerant in the refrigerant circuit II has no temperature control requirement, the liquid supply pipeline I is disconnected from the refrigerant circuit III, and the refrigerant in the refrigerant circuit I reaches the liquid supply temperature by adjusting the refrigeration system and / or the fan assembly; When the refrigerant in the refrigerant circuit Ⅰ has no temperature control requirement, and the refrigerant in the refrigerant circuit Ⅱ has temperature control requirement, the liquid supply pipeline Ⅰ is connected with the refrigerant circuit Ⅲ, and the water pump Ⅱ is frequency-controlled until the refrigerant in the refrigerant circuit Ⅱ reaches the liquid supply temperature; When both the refrigerant in refrigerant circuit I and the refrigerant in refrigerant circuit II have temperature control requirements, the refrigerant in refrigerant circuit I and the refrigerant in refrigerant circuit II reach the liquid supply temperature by adjusting the refrigeration system and / or fan assembly and the opening of the three-way proportional valve II.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention can automatically select a refrigeration system and / or a natural cooling system for heat dissipation according to actual working conditions and requirements, and can simultaneously take into account the different liquid supply requirements of PACK heat dissipation and PCS heat dissipation. The two coolant circuits are relatively independent and can be used for targeted temperature adjustment. The present invention takes into account the cold winter and transitional seasons, introduces a natural system, and uses natural cold sources to achieve cooling, thereby improving the overall energy efficiency of the system; The present invention integrates an automatic liquid replenishing system in a compact design, which reduces the number of maintenance times for refrigerant liquid replenishment, thereby reducing operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a working principle diagram of the present invention; Among them: 1. Natural cooling system; 11. Natural cooling radiator; 2. Refrigeration system; 21. Condenser; 22. Compressor; 23. Evaporator I; 24. Expansion valve; 25. Dryer; 26. Liquid storage tank; 27. Low pressure sensor; 28. High pressure sensor; 3. Liquid return pipeline I; 31. Three-way proportional valve I; 32. Water pump I; 33. Expansion tank I; 34. Liquid return pressure sensor I; 35. Liquid return temperature sensor I; 4. Liquid supply pipeline I; 41. Heater; 42. Three-way proportional valve II; 43. Safety valve I; 44. Liquid supply pressure sensor I; 45. Liquid supply temperature sensor Ⅰ; 5. Liquid return pipeline Ⅱ; 51. Water pump Ⅱ; 52. Expansion tank Ⅱ; 53. Liquid return pressure sensor Ⅱ; 54. Liquid return temperature sensor Ⅱ; 6. Liquid supply pipeline Ⅱ; 61. Safety valve Ⅱ; 62. Liquid supply pressure sensor Ⅱ; 63. Liquid supply temperature sensor Ⅱ; 7. Refrigerant circuit Ⅲ; 71. Evaporator Ⅱ; 8. Liquid replenishment circuit; 81. Liquid storage tank; 82. Water pump Ⅲ; 83. Three-way proportional valve Ⅲ; 84. Main pipe; 841. Branch pipe Ⅰ; 842. Branch pipe Ⅱ; 85. Pipeline Ⅱ; 86. Pipeline Ⅲ; 87. Manual liquid replenishment pipeline; 9. Ambient temperature test component; 10. Fan component. DETAILED DESCRIPTION

[0016] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. The "first", "second" and similar words mentioned in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "one" and other similar words do not indicate a quantity restriction, but indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more. For example, multiple positioning columns refer to two or more positioning columns. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] The present invention is described in detail below.

[0018] like Figure 1 As shown: An energy storage temperature control system, comprising a natural cooling system 1, a refrigeration system 2 connected in parallel with the natural cooling system 1, a coolant circuit I, a coolant circuit II, a coolant circuit III 7, a liquid replenishment circuit 8, an ambient temperature test component 9 for ambient temperature testing, and a fan component 10 used in conjunction with the natural cooling system 1 and the refrigeration system 2; In order to effectively exchange heat with the brine through the refrigeration system 2, the brine in the brine loop I can achieve circulating heat dissipation for the heat dissipated equipment; the refrigeration system 2 includes a condenser 21, a compressor 22 connected to the condenser 21, and an evaporator I 23 connected to the condenser 21 and the compressor 22 respectively; the evaporator I 23 is connected to the natural cooling system 1 and the brine loop I; The natural cooling system 1 comprises a natural cooling radiator 11 connected to the coolant circuit I; The fan assembly 10 is mainly used for heat dissipation of the natural cooling radiator 11 and the condenser 21. When the natural cooling system 1 is used for heat dissipation, if the temperature of the brine in the brine loop I needs to be adjusted, it can also adjust the temperature of the brine in the brine loop I; The refrigerant circuit I is connected to the natural cooling radiator 11, the evaporator I 23, the refrigerant circuit III 7, and the liquid replenishment circuit 8 respectively; Specifically, the refrigerant circuit I includes a liquid return line I3 and a liquid supply line I4 respectively connected to the refrigeration system 2; The brine circuit II is connected to the brine circuit III 7 and the liquid replenishment circuit 8 respectively; Specifically, the refrigerant circuit III7 includes an evaporator II71 connected to the liquid return line I3 and the liquid supply line I4 respectively; The liquid return line I3 is connected to the input ends of the coolant loop III7, the liquid replenishment loop 8, the evaporator I23, and the natural cooling radiator 11 respectively. The liquid supply pipeline I4 is connected to the output ends of the coolant circuit III7, the liquid replenishment circuit 8, the evaporator I23, and the natural cooling radiator 11 respectively; The refrigerant circuit II includes a liquid return line II5 and a liquid supply line II6 respectively connected to the evaporator II71; The liquid return pipeline II5 and the liquid supply pipeline II6 are respectively connected to the liquid replenishment circuit 8; After the refrigerant in the refrigerant circuit I and the refrigerant circuit II absorbs the heat of the heat-dissipated equipment, it is transported to the natural cooling system 1 and / or the refrigeration system 2 through the corresponding return liquid pipeline I3 and the return liquid pipeline II5 for heat exchange and then cooled again. Subsequently, the cooled refrigerant cools the heat-dissipated equipment again through the supply liquid pipeline I4 and the supply liquid pipeline II6 and is recycled.

[0019] Specifically, when the ambient temperature is greater than the ambient temperature threshold value I, the refrigeration system 2 is turned on to dissipate heat, and the natural cooling system 1 is turned off; the refrigeration system 2, the refrigerant circuit I, the refrigerant circuit II, the refrigerant circuit III7, and the liquid replenishment circuit 8 are used in conjunction to dissipate heat for the heat dissipated equipment; When the ambient temperature is lower than the ambient temperature threshold II, the natural cooling system 1 is turned on to dissipate heat, and the refrigeration system 2 is turned off; the natural cooling system 1, the refrigerant circuit I, the refrigerant circuit II, the refrigerant circuit III7, and the liquid replenishment circuit 8 are used together to dissipate heat for the equipment being dissipated; When the ambient temperature is at the ambient temperature threshold value I and the ambient temperature threshold value II, the natural cooling system 1 and the refrigeration system 2 are both turned on; the natural cooling system 1, the refrigeration system 2, the refrigerant circuit I, the refrigerant circuit II, the refrigerant circuit III7, and the liquid replenishment circuit 8 are used in conjunction to achieve heat dissipation of the heat dissipated equipment.

[0020] In some possible implementations, the liquid return pipeline Ⅰ3 is provided with a three-way proportional valve Ⅰ31, a water pump Ⅰ32, an expansion tank Ⅰ33, a liquid return pressure sensor Ⅰ34 and a liquid return temperature sensor Ⅰ35 respectively connected to the natural cooling system 1 and the refrigeration system 2; the three-way proportional valve Ⅰ31, the water pump Ⅰ32 and the expansion tank Ⅰ33 are sequentially arranged in the opposite direction of the flow of the refrigerant in the liquid return pipeline Ⅰ3, and the liquid return pressure sensor Ⅰ34 and the liquid return temperature sensor Ⅰ35 are arranged on the side of the expansion tank Ⅰ33 away from the water pump Ⅰ32; The return liquid pressure sensor Ⅰ34 and the return liquid temperature sensor Ⅰ35 are used to test the pressure and temperature of the refrigerant in the return liquid pipeline Ⅰ3; Specifically, the three-way proportional valve I31 is provided with port A, port B and port C, port B is connected to the evaporator I23 in the refrigeration system 2 through a pipeline, port C is connected to the natural cooling radiator 11 in the natural cooling system 1 through a pipeline, and port A is connected to the water pump I32; Specifically, when port A is connected to port C and port B is closed, the return liquid pipeline I3 is connected to the natural cooling system 1; when port A is connected to port B and port C is closed, the return liquid pipeline I3 is connected to the refrigeration system 2; when the return liquid pipeline I3 needs to be connected to the refrigeration system 2 and the natural cooling system 1 respectively, port A is connected to port B and port C respectively, which is achieved by controlling the opening ratio of the three-way proportional valve I31.

[0021] Furthermore, a heater 41, a three-way proportional valve II42 connected to the evaporator II71 in the refrigerant circuit III7, a safety valve I43 connected to the liquid replenishment circuit 8, a liquid supply pressure sensor I44 and a liquid supply temperature sensor I45 are arranged on the liquid supply pipeline I4; the heater 41, the three-way proportional valve II42 and the safety valve I43 are arranged in sequence along the refrigerant flow direction in the liquid supply pipeline I4, and the liquid supply pressure sensor I44 and the liquid supply temperature sensor are arranged on the side of the safety valve I43 away from the three-way proportional valve II42; When the ambient temperature is low, the temperature of the coolant is adjusted by the heater 41; the temperature of the coolant in the coolant circuit I and / or the coolant circuit III7 is regulated according to the use requirements; The liquid supply pressure sensor Ⅰ44 and the liquid supply temperature sensor Ⅰ45 are used to test the pressure and temperature of the refrigerant in the liquid supply pipeline Ⅰ4.

[0022] In some possible implementations, the connection point between the evaporator II 71 and the liquid return pipeline I3 is set on the side of the expansion tank I33 away from the water pump I32; specifically, the connection point is set between the expansion tank I33 and the liquid return pressure sensor I34.

[0023] In some possible implementations, a water pump II51, an expansion tank II52, a liquid return pressure sensor II53 and a liquid return temperature sensor II54 are sequentially arranged on the liquid return pipeline II5 in the opposite direction of the flow of the brine in the liquid return pipeline II5; The liquid return pressure sensor Ⅱ53 and the liquid return temperature sensor Ⅱ54 are used to test the pressure and temperature of the refrigerant in the liquid return pipeline Ⅱ5; The liquid supply pipeline II6 is provided with a safety valve II61 connected to the liquid replenishment circuit 8, a liquid supply pressure sensor II62 and a liquid supply temperature sensor II63; The liquid supply pressure sensor Ⅱ62 and the liquid supply temperature sensor Ⅱ63 are used to test the pressure and temperature of the coolant in the liquid supply pipeline Ⅱ6; It should be noted that: the three-way proportional valve II 42 is provided with a D port communicating with the heater 41 , an E port connected with the evaporator II 71 , and an F port communicating with the safety valve I 43 ; When the refrigeration system 2 and / or the natural cooling system 1 is used, when the refrigerant in the refrigerant circuit I has a temperature control requirement and the refrigerant in the refrigerant circuit II has no temperature control requirement, the D port and the F port of the three-way proportional valve II 42 are connected, and the heater 41 is not connected to the evaporator II 71 in the refrigerant circuit III 7; according to the temperature data collected by the liquid supply temperature sensor I 45 and the liquid return temperature sensor I 35, the temperature of the refrigerant in the refrigerant circuit I is adjusted by the refrigeration system 2 and / or the fan assembly 10; It should be noted that the fan assembly 10 in the above description is mainly used to collect temperature data for adjusting the coolant circuit I when the natural cooling system 1 is used for heat dissipation; when adjusting the refrigeration system 2, the temperature and pressure of the refrigerant in the refrigeration system 2 will also be collected; When the refrigeration system 2 and / or the natural cooling system 1 is used, when the refrigerant in the refrigerant circuit I has no temperature control requirement and the refrigerant in the refrigerant circuit II has a temperature control requirement, the D port of the three-way proportional valve II42 is connected to the E port; according to the temperature data collected by the liquid supply temperature sensor II63 and the liquid return temperature sensor II54, the temperature of the refrigerant in the refrigerant circuit II is adjusted by frequency conversion of the water pump II51; When both the refrigerant in the refrigerant circuit I and the refrigerant in the refrigerant circuit II have temperature control requirements, the D port of the three-way proportional valve II42 is connected to the E port and the F port respectively, and the refrigeration system 2 or the fan assembly 10 is adjusted according to the temperature data collected by the supply temperature sensor I45, the return temperature sensor I35, the supply temperature sensor II63, and the return temperature sensor II54, and the proportional adjustment of the three-way proportional valve II42 is coordinated to achieve temperature adjustment of the refrigerant in the refrigerant circuit I and the refrigerant circuit II; The above-described adjustment of the refrigeration system 2 is mainly for controlling the frequency of the compressor 22 in the refrigeration system 2 , the rotation speed of the fan assembly 10 , and the opening degree of the electronic expansion valve 24 .

[0024] In some possible implementations, the liquid replenishment circuit 8 includes an automatic liquid replenishment pipeline connected to the liquid return pipeline I3, the liquid supply pipeline I4, the liquid return pipeline II5, and the liquid supply pipeline II6, respectively, and a manual liquid replenishment pipeline 87 connected to the liquid return pipeline I3 and the liquid return pipeline II5, respectively; The manual liquid filling pipeline 87 is mainly used when adding the coolant at the beginning and when the system discharges the coolant; Automatic liquid replenishment pipeline, capable of replenishing the refrigerant, realizing pressure adjustment of the return liquid pipeline Ⅰ3 and the supply liquid pipeline Ⅰ4, the return liquid pipeline Ⅱ5 and the supply liquid pipeline Ⅱ6; Through the cooperation of the automatic liquid replenishment pipeline with the safety valve Ⅰ43, the safety valve Ⅱ61 and the sensor, the pressure in the refrigerant circuit Ⅰ and the refrigerant circuit Ⅱ can be regulated and controlled; through the pressure in the refrigerant circuit Ⅰ and the refrigerant circuit Ⅱ, the refrigerant flow rate can be effectively controlled, and the pressure balance between the return liquid pipeline Ⅰ3 and the supply liquid pipeline Ⅰ4, the return liquid pipeline Ⅱ5 and the supply liquid pipeline Ⅱ6 can be ensured.

[0025] In some possible implementations, the automatic liquid replenishment pipeline includes a liquid storage tank 81 storing a coolant, a pipeline I connected to the liquid return pipeline I3 and the liquid return pipeline II5 respectively, a pipeline II85 connected to the liquid supply pipeline II6, and a pipeline III86 connected to the liquid supply pipeline I4; the pipeline I, the pipeline II85, and the pipeline III86 are connected to the liquid storage tank 81 respectively; the other end of the pipeline II85 is connected to the safety valve II61, and the other end of the pipeline III86 is connected to the safety valve I43; The pipeline Ⅰ includes a main pipe 84 provided with a water pump Ⅲ82 and a three-way proportional valve Ⅲ83, a branch pipe Ⅰ841 connected to the three-way proportional valve Ⅲ83 and the liquid return line Ⅰ3, respectively, and a branch pipe Ⅱ842 connected to the three-way proportional valve Ⅲ83 and the liquid return line Ⅱ5; check valves are provided on the branch pipe Ⅰ841 and the branch pipe Ⅱ842; The connection point between the branch pipe Ⅰ841 and the liquid return line Ⅰ3 is set between the water pump Ⅰ32 and the expansion tank Ⅰ33; the connection point between the branch pipe Ⅱ842 and the liquid return line Ⅱ5 is set between the water pump Ⅱ51 and the expansion tank Ⅱ52; The three-way proportional valve III 83 has an H port connected to the water pump III 82 , an I port connected to the branch pipe I 841 , and a J port connected to the branch pipe II 842 ; When the liquid supply pressure sensor Ⅰ44 and the liquid return pressure sensor Ⅰ34 detect that the liquid supply pressure in the brine circuit Ⅰ is higher than the preset value, the safety valve Ⅰ43 opens to release the pressure, and the excess brine flows into the liquid storage tank 81 to achieve pressure reduction; When the liquid supply pressure sensor Ⅰ44 and the liquid return pressure sensor Ⅰ34 detect that the liquid supply pressure in the brine loop Ⅰ is lower than the preset value, the water pump Ⅲ82 is turned on, the H port in the three-way proportional valve Ⅲ83 is connected to the I port, and the brine in the liquid storage tank 81 enters the water pump Ⅰ32 through the water pump Ⅲ82, the three-way proportional valve Ⅲ83, and the check valve on the branch pipe Ⅰ841, and then enters the brine loop Ⅰ, and the liquid supply pressure in the brine loop Ⅰ is adjusted to achieve pressurization; When the liquid supply pressure of the brine circuit II is detected to be higher than the preset value by the liquid supply pressure sensor II 62 and the liquid return pressure sensor II 53, the safety valve II 61 is opened to release the pressure, and the excess brine flows into the liquid storage tank 81 to achieve pressure reduction; When the liquid supply pressure of the refrigerant circuit II is detected to be lower than the preset value through the liquid supply pressure sensor II62 and the liquid return pressure sensor II53, the water pump III82 is turned on, the H port and the J port in the three-way proportional valve III83 are connected, and the refrigerant in the liquid storage tank 81 enters the water pump II51 through the water pump III82, the three-way proportional valve III83, and the check valve on the branch pipe II842, and then enters the refrigerant circuit II, and the liquid supply pressure in the refrigerant circuit II is adjusted to achieve pressurization.

[0026] Furthermore, the manual liquid replenishment pipeline 87 includes a liquid replenishment pipeline, a bypass I connected to the liquid replenishment pipeline and the liquid return pipeline I3, and a bypass II connected to the liquid replenishment pipeline and the liquid return pipeline II5; ball valves are respectively provided on the bypass I and the bypass II.

[0027] In some possible implementations, the natural cooling radiator 11 is connected to the C port of the three-way proportional valve Ⅰ31 through a pipeline, and the natural cooling radiator 11 is connected to the evaporator Ⅰ23 through a pipeline, and the connection point is set between the evaporator Ⅰ23 and the heater 41.

[0028] In some possible embodiments, the refrigeration system 2 is prior art, which also includes an expansion valve 24, a dryer 25, a liquid storage tank 26, a high-pressure sensor 28, a low-pressure sensor 27, and a temperature sensor; the expansion valve 24, the dryer 25, and the liquid storage tank 26 are arranged on the output pipeline between the condenser 21 and the evaporator Ⅰ23; the high-pressure sensor 28 is arranged between the compressor 22 and the condenser 21, and the low-pressure sensor 27 is arranged between the compressor and the evaporator Ⅰ23.

[0029] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. An energy storage temperature control system, characterized in that: It includes a natural cooling system, a refrigeration system connected in parallel with the natural cooling system, a refrigerant circuit I, a refrigerant circuit II, a refrigerant circuit III, a liquid replenishment circuit, an ambient temperature test component, and a fan component used in conjunction with the natural cooling system and the refrigeration system; The refrigerant circuit I is connected to the natural cooling system, the refrigeration system, the refrigerant circuit III, and the liquid replenishment circuit respectively; The refrigerant circuit II is connected to the refrigerant circuit III and the liquid replenishment circuit respectively.

2. The energy storage temperature control system according to claim 1, characterized in that: The refrigerant circuit I comprises a liquid return line I and a liquid supply line I respectively connected to the refrigeration system; The liquid return pipeline I is connected to the coolant circuit III, the liquid replenishment circuit, and the natural cooling system respectively; The liquid supply pipeline I is connected to the coolant circuit III, the liquid replenishment circuit, and the natural cooling system respectively.

3. The energy storage temperature control system according to claim 2, characterized in that: The return liquid pipeline I is provided with a three-way proportional valve I, a water pump I, an expansion tank I, a return liquid pressure sensor I and a return liquid temperature sensor I which are respectively connected to the natural cooling system and the refrigeration system; the three-way proportional valve I, the water pump I and the expansion tank I are arranged in sequence along the opposite direction of the flow of the refrigerant in the return liquid pipeline I, and the return liquid pressure sensor I and the return liquid temperature sensor I are arranged on the side of the expansion tank I away from the water pump I; The connection point between the liquid replenishment circuit and the liquid return pipeline I is arranged between the water pump I and the expansion tank I; A heater, a three-way proportional valve II connected to a coolant circuit III, a safety valve I connected to a liquid replenishment circuit, a liquid supply pressure sensor I and a liquid supply temperature sensor I are arranged on the liquid supply pipeline I; the heater, the three-way proportional valve II and the safety valve I are arranged in sequence along the flow direction of the coolant in the liquid supply pipeline I, and the liquid supply pressure sensor I and the liquid supply temperature sensor are arranged on the side of the safety valve I away from the three-way proportional valve II.

4. The energy storage temperature control system according to claim 2, characterized in that: The refrigerant circuit III includes an evaporator II connected to a liquid return line I and a three-way proportional valve II respectively; the connection point between the evaporator II and the liquid return line I is arranged on a side of the expansion tank I away from the water pump I.

5. The energy storage temperature control system according to claim 4, characterized in that: The refrigerant circuit II includes a liquid return line II and a liquid supply line II respectively connected to the evaporator II; The liquid return pipeline II and the liquid supply pipeline II are respectively connected to the liquid replenishment circuit.

6. The energy storage temperature control system according to claim 5, characterized in that: A water pump II, an expansion tank II, a liquid return pressure sensor II and a liquid return temperature sensor II are sequentially arranged on the liquid return pipeline II; The liquid supply pipeline II is provided with a safety valve II connected to the liquid replenishment circuit, a liquid supply pressure sensor II and a liquid supply temperature sensor II.

7. The energy storage temperature control system according to claim 6, characterized in that: The liquid replenishment circuit includes an automatic liquid replenishment pipeline connected to the liquid return pipeline I, the liquid supply pipeline I, the liquid return pipeline II, and the liquid supply pipeline II respectively, and a manual liquid replenishment pipeline connected to the liquid return pipeline I and the liquid return pipeline II respectively.

8. The energy storage temperature control system according to claim 7, characterized in that: The automatic liquid replenishment pipeline includes a liquid storage tank storing a coolant, a pipeline I connected to a liquid return pipeline I and a liquid return pipeline II respectively, a pipeline II connected to a liquid supply pipeline II, and a pipeline III connected to a liquid supply pipeline I; the pipeline I, pipeline II, and pipeline III are respectively connected to the liquid storage tank; The pipeline Ⅰ includes a main pipe provided with a water pump Ⅲ and a three-way proportional valve Ⅲ, a branch pipe Ⅰ connected to the three-way proportional valve Ⅲ and the liquid return line Ⅰ, and a branch pipe Ⅱ connected to the three-way proportional valve Ⅲ and the liquid return line Ⅱ; check valves are provided on the branch pipes Ⅰ and Ⅱ; The manual liquid replenishment pipeline includes a liquid replenishment pipeline, a bypass I connected to the liquid replenishment pipeline and the liquid return pipeline I, and a bypass II connected to the liquid replenishment pipeline and the liquid return pipeline II; ball valves are respectively arranged on the bypass I and the bypass II.

9. The energy storage temperature control system according to claim 1, characterized in that: The refrigeration system comprises a condenser, a compressor connected to the condenser, and an evaporator I connected to the condenser and the compressor respectively; the evaporator I is connected to a natural cooling system and a refrigerant circuit I; The natural cooling system includes a natural cooling radiator connected to the coolant circuit I.

10. A control method for an energy storage temperature control system according to any one of claims 1 to 9, characterized in that: The specific steps include: When the ambient temperature is greater than the ambient temperature threshold I, the refrigeration system is turned on, the natural cooling system is turned off, and the refrigerant enters the refrigeration system; When the ambient temperature is lower than the ambient temperature threshold II, the refrigeration system is turned off, the natural cooling system is turned on, and the refrigerant enters the natural cooling radiator; When the ambient temperature is between the ambient temperature threshold Ⅰ and the threshold Ⅱ, the refrigeration system and the natural cooling system are turned on at the same time, and the refrigerant flows through the evaporator Ⅰ and the natural cooling radiator at the same time; When the supply pressure of the coolant circuit I is higher than the preset value, the safety valve I opens to release the pressure, and the excess coolant flows into the liquid storage tank; When the liquid supply pressure of the coolant circuit I is lower than the preset value, the coolant in the liquid storage tank flows through the water pump III, the three-way proportional valve III, and the check valve on the branch I to the inlet of the water pump I; When the supply pressure of the coolant circuit II is higher than the preset value, the safety valve II opens to release the pressure, and the excess coolant flows into the liquid storage tank through the pipeline; When the supply pressure of the coolant circuit II is lower than the preset value, the water pump III is turned on, and the coolant in the storage tank flows through the water pump III, the three-way proportional valve III, and the check valve on the branch II to the inlet of the water pump II; When the refrigerant in the refrigerant circuit I has a temperature control requirement, and the refrigerant in the refrigerant circuit II has no temperature control requirement, the liquid supply pipeline I is disconnected from the refrigerant circuit III, and the refrigerant in the refrigerant circuit I reaches the liquid supply temperature by adjusting the refrigeration system and / or the fan assembly; When the refrigerant in the refrigerant circuit Ⅰ has no temperature control requirement, and the refrigerant in the refrigerant circuit Ⅱ has temperature control requirement, the liquid supply pipeline Ⅰ is connected with the refrigerant circuit Ⅲ, and the water pump Ⅱ is frequency-controlled until the refrigerant in the refrigerant circuit Ⅱ reaches the liquid supply temperature; When both the refrigerant in refrigerant circuit I and the refrigerant in refrigerant circuit II have temperature control requirements, the refrigerant in refrigerant circuit I and the refrigerant in refrigerant circuit II reach the liquid supply temperature by adjusting the refrigeration system and / or fan assembly and the opening of the three-way proportional valve II.

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