CN218210152U

CN218210152U - Phase-change type liquid cooling energy storage heat and humidity separation type refrigerating system

Info

Publication number: CN218210152U
Application number: CN202222292847.4U
Authority: CN
Inventors: 李少斌; 王晓东; 王俊镭
Original assignee: Onoff Electric Co ltd
Current assignee: Onoff Electric Co ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2023-01-03
Anticipated expiration: 2032-08-30

Abstract

The utility model provides a phase-change liquid-cooling energy-storage heat-moisture separation type refrigerating system, which belongs to the technical field of chemical liquid-cooling battery energy storage and comprises a battery cabinet, an air cooling system and an in-cabinet liquid cooling system; the air cooling system comprises a fan assembly, and the fan assembly comprises a fan, an air cooling evaporator and an electric heater which are sequentially arranged from front to back; the air outlet temperature of the fan assembly is higher than the dew point temperature of air in the battery cabinet; the liquid cooling system in the cabinet is connected with the low-pressure circulating barrel by a liquid supply pipeline and an air return pipeline; the liquid cooling system in the cabinet comprises a first circulating pipeline and a second circulating pipeline; the second circulating pipeline comprises a second liquid supply pipe and a second air return pipe, wherein the second liquid supply pipe is connected with the liquid supply pipeline and the inlet end of the air-cooled evaporator, and the second air return pipe is connected with the outlet end of the air-cooled evaporator and the air return pipeline. The utility model provides a hot moisture separating type refrigerating system of phase transition formula liquid cooling energy storage, the actual temperature through making air in the cabinet is higher than its dew point temperature, has avoided the air to appear the comdenstion water after meeting the cold.

Description

Phase-change type liquid cooling energy storage heat and humidity separation type refrigerating system

Technical Field

The utility model belongs to the technical field of chemical liquid cooling battery energy storage, more specifically says, relates to a phase transition formula liquid cooling energy storage heat moisture from type refrigerating system.

Background

In the battery energy storage field, in order to promote system energy density, promote radiating efficiency, reduce demands such as electric core difference in temperature, adopt the liquid cooling structure usually. Along with the introduction of liquid cooling structure, battery protection level promotes greatly, and the battery cabinet is airtight box usually for the inside air current exchange with the external environment of battery cabinet is restricted.

If the temperature of the air in the cabinet body is higher and the temperature of the liquid cooling plate is lower, the air with the higher temperature is easier to condense out condensed water after contacting the liquid cooling plate, a battery module shell in the cabinet body is easier to form a short circuit through the condensed water, and the safety and the reliability are poorer.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a phase transition formula liquid cooling energy storage heat moisture separation type refrigerating system aims at solving the problem that the liquid cooling heat transfer easily produces the comdenstion water.

In order to achieve the purpose, the utility model adopts the technical proposal that: provided is a phase change type liquid cooling energy storage heat and humidity separation type refrigerating system, including:

a battery cabinet having a plurality of battery modules therein; a low-pressure circulating barrel filled with refrigerant is arranged on the outer side of the battery cabinet;

the air cooling system comprises a fan assembly arranged at the bottom of the inner cavity of the battery cabinet, the fan assembly comprises a fan, an air cooling evaporator and an electric heater which are sequentially arranged from front to back, and gaps between the battery modules and the front and back walls of the battery cabinet and gaps between the adjacent battery modules are mutually communicated to form a circulating cooling air channel; the air outlet temperature of the fan component is higher than the dew point temperature of the air in the battery cabinet;

the liquid cooling system in the cabinet is connected with the low-pressure circulating barrel by virtue of a liquid supply pipeline and an air return pipeline; the liquid cooling system in the cabinet comprises a first circulating pipeline and a second circulating pipeline; the first circulation line includes a first liquid supply pipe connecting the liquid supply line and a refrigerant inlet of the battery module, and a first gas return pipe connecting the gas return line and a refrigerant outlet of the battery module; the second circulating pipeline comprises a second liquid supply pipe and a second air return pipe, wherein the second liquid supply pipe is connected with the liquid supply pipeline and the inlet end of the air-cooled evaporator, and the second air return pipe is connected with the outlet end of the air-cooled evaporator and the air return pipeline.

As another embodiment of the present application, an air-homogenizing plate is installed at the rear of the battery cabinet, and divides the battery cabinet into a rear air duct for communicating with the fan assembly and an installation space for installing the battery module, and the installation space is located in front of the rear air duct; and a plurality of ventilation holes communicated with the rear air channel and the installation space are formed in the air homogenizing plate.

As another embodiment of the present application, a plurality of the battery modules are longitudinally disposed at equal intervals in the installation space; a front air duct is arranged between the front end of the battery module and the front side wall of the battery cabinet, and a horizontal air duct is formed by a gap between the adjacent battery modules; the horizontal air duct communicates the rear air duct and the front air duct.

As another embodiment of the present application, a condensed water collecting tray is provided at a lower portion of the fan assembly, and a condensed water drain hose is provided at a lower end of the condensed water collecting tray.

As another embodiment of the present application, the plurality of first liquid supply tubes on the same liquid supply line are all arranged in parallel.

As another embodiment of the present application, the method further includes:

the liquid cooling system outside the cabinet comprises a compressor, a condenser, a main path expansion valve and the low-pressure circulating barrel; an oil separator is arranged between the compressor and the condenser, an oil return pipeline is arranged at the lower end of the oil separator, and lubricating oil in the refrigerant enters the oil return pipeline from the oil separator, sequentially passes through an oil cooler, an oil return capillary tube and an oil return electromagnetic valve and then reenters the compressor; the temperature of the refrigerant in the low-pressure circulation barrel is higher than the dew-point temperature of the air in the battery cabinet.

As another embodiment of the present application, the exhaust pipe on the low-pressure circulation barrel is communicated with the compressor, the low-pressure circulation barrel is further provided with an auxiliary oil return pipe, one end of the auxiliary oil return pipe is located inside the low-pressure circulation barrel, and the upper end of the auxiliary oil return pipe penetrates through the low-pressure circulation barrel and is connected with the exhaust pipe by means of an oil return spray pipe; and the auxiliary oil return pipe is provided with an adjusting hand valve and an oil return sight glass.

As another embodiment of the present application, an auxiliary cooling circuit is further disposed between the condenser and the main path expansion valve, and the auxiliary cooling circuit is connected to the oil cooler for cooling the high-temperature and high-pressure lubricating oil in the oil cooler.

The utility model provides a phase transition formula liquid cooling energy storage heat moisture separation type refrigerating system's beneficial effect lies in: compared with the prior art, the phase-change type liquid cooling energy storage heat and moisture separation type refrigerating system is characterized in that an air cooling system and an in-cabinet liquid cooling system are arranged in a battery cabinet, and the in-cabinet liquid cooling system not only cools a battery module but also cools air in the air cooling system; the temperature of the air in the cabinet body is reduced through the air cooling system and the liquid cooling system in the cabinet, the temperature difference between the air in the cabinet and the battery module is reduced, the actual temperature of the air in the battery cabinet is higher than the dew point temperature of the air, and the condition that the air in the cabinet body is condensed to separate out condensed water after being cooled is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a phase-change type liquid-cooling energy-storage heat-moisture separation type refrigeration system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an air cooling system according to an embodiment of the present invention.

In the figure: 1. a central control unit; 2. a compressor; 3. an oil separator; 4. an oil level switch; 5. a phase change refrigeration control unit; 6. a condensing fan; 7. a condenser; 8. a reservoir; 9. drying the filter; 10. a main path expansion valve; 11. an oil return adjusting hand valve; 12. a low pressure recycle bin; 13. a high level switch; 14. a low level switch; 15. a refrigerant pump; 16. an outlet check valve; 17. an oil return liquid sight glass; 18. an oil return spray pipe; 19. a liquid supply line; 20. a return gas line; 21. a bypass electronic expansion valve; 22. an oil cooler; 23. an oil return capillary tube; 24. an oil return electromagnetic valve; 25. a battery cabinet; 26. a battery cabinet temperature control unit; 27. a battery module; 28. a first flow regulating valve; 29. a main liquid supply hose; 30. a first liquid supply tube; 31. a second liquid supply tube; 32. a second flow regulating valve; 33. an auxiliary expansion valve; 34. an auxiliary liquid supply hose; 35. a fan; 36. a fan assembly; 37. an auxiliary return air hose; 38. a first return air pipe; 39. a second muffler; 40. a temperature and humidity sensor; 41. a primary air return hose; 42. a gas return one-way valve; 43. an air-cooled evaporator; 44. a condensed water drain hose; 45. a condensed water collecting tray; 46. an electric heater; 47. an air-even plate.

Detailed Description

In order to make the technical problem, technical solution and beneficial effects to be solved by the present invention more clearly understood, the following description is made in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1 to 2, a phase-change type liquid-cooling energy-storage heat-moisture separation type refrigeration system according to the present invention will now be described. The phase-change type liquid cooling energy storage heat and humidity separation type refrigerating system comprises a battery cabinet 25, an air cooling system and an in-cabinet liquid cooling system; the battery cabinet 25 is provided with a plurality of battery modules 27; a low-pressure circulating barrel 12 filled with refrigerant is arranged on the outer side of the battery cabinet 25; the air cooling system comprises a fan assembly 36 arranged at the bottom of the inner cavity of the battery cabinet 25, the fan assembly 36 comprises a fan 35, an air cooling evaporator 43 and an electric heater 46 which are sequentially arranged from front to back, and a gap between the battery module 27 and the front wall and the back wall of the battery cabinet 25 and a gap between the adjacent battery modules 27 are communicated with each other to form a circulating cooling air channel; the outlet air temperature of the fan assembly 36 is higher than the dew point temperature of the air in the battery cabinet 25; the liquid cooling system in the cabinet is connected with the low-pressure circulating barrel 12 through a liquid supply pipeline 19 and an air return pipeline 20; the liquid cooling system in the cabinet comprises a first circulating pipeline and a second circulating pipeline; the first circulation line includes a first liquid supply pipe 30 connecting the liquid supply line 19 and the refrigerant inlet of the battery module 27, and a first gas return pipe 38 connecting the gas return line 20 and the refrigerant outlet of the battery module 27; the second circulation line includes a second liquid supply pipe 31 connecting the liquid supply line 19 and the inlet end of the air-cooled evaporator 43, and a second air return pipe 39 connecting the outlet end of the air-cooled evaporator 43 and the air return line 20.

Compared with the prior art, the phase-change type liquid cooling energy storage heat-humidity separation type refrigerating system provided by the utility model has the advantages that the battery cabinet 25 is internally provided with an air cooling system and an in-cabinet liquid cooling system; when the battery module 27 works, the air cooling system or the liquid cooling system in the cabinet is started or the air cooling system and the liquid cooling system in the cabinet are started simultaneously; the battery modules 27 in the battery cabinet 25 are cooled.

The air cooling system comprises a fan assembly 36 arranged at the lower end of the inner cavity of the battery cabinet 25, wherein the fan assembly 36 comprises a fan 35, an air cooling evaporator 43 and an electric heater 46 which are sequentially arranged from front to back; the air in the cabinet body sequentially passes through the gap between the battery modules 27 and the rear wall of the battery cabinet 25, the gap between the battery modules 27 and the gap between the front walls of the battery modules 27 and the battery cabinet 25 under the action of the fan and finally returns to the fan, so that a complete circulating cooling air duct is formed, and air cooling circulation is completed.

The in-cabinet liquid cooling system includes a first circulation line for cooling battery module 27 and a second circulation line for cooling air-cooled evaporator 43 in fan assembly 36. The low-temperature refrigerant in the low-pressure circulating barrel 12 enters the cabinet body from the liquid supply pipeline 19, a part of the refrigerant enters the first liquid supply pipe 30 and enters the battery module 27 through the first liquid supply pipe 30, the liquid refrigerant exchanges heat with the battery module 27 to form a gaseous refrigerant, and the gaseous refrigerant is conveyed to the gas return pipeline 20 from the first gas return pipe 38 and then conveyed to the low-temperature circulating barrel through the gas return pipeline 20; another part of the refrigerant enters the second liquid supply pipe 31 and enters the air-cooled evaporator 43 of the fan assembly 36 through the second liquid supply pipe 31, the liquid refrigerant exchanges heat with the air-cooled evaporator 43 to form a gaseous refrigerant, and the gaseous refrigerant is delivered from the second gas return pipe 39 to the gas return line 20 to be mixed with the gaseous refrigerant delivered from the first gas return pipe 38. The second air return pipe 39 is connected to the upper part of the first air return pipe 38, and an air return check valve 42 is arranged above the connection point; the mixed gaseous refrigerant enters the return line 20 through the return check valve 42.

The utility model provides a phase transition type liquid cooling energy storage heat and moisture separation type refrigerating system, sets up air cooling system and the interior liquid cooling system of cabinet in battery cabinet 25, and the interior liquid cooling system of cabinet not only cools off battery module 27 but also cools off the air in the air cooling system; the temperature of the air in the cabinet body is reduced through the air cooling system and the liquid cooling system in the cabinet, the temperature difference between the air in the cabinet and the battery module 27 is reduced, the actual temperature of the air in the battery cabinet 25 is higher than the dew point temperature of the air, and the condition that the air in the cabinet body is condensed to separate out condensed water after being cooled is avoided.

Optionally, the battery module 27 includes a liquid-cooled bottom plate, a module housing, and a battery cell; the module shell is fixed on the liquid cooling bottom plate to form a drawer structure, and the battery monomer is located inside the drawer structure. The liquid cooling bottom plate is provided with a refrigeration inlet and a refrigeration outlet, a bent working medium flow passage is arranged in the liquid cooling bottom plate, and a refrigerant enters the working medium flow passage in the liquid cooling bottom plate from the refrigeration inlet and flows to the refrigeration outlet along the working medium flow passage; and the refrigerant in the working medium flow channel exchanges heat with the battery monomer by virtue of the liquid cooling bottom plate.

In another embodiment, the battery cabinet 25 is an immersed liquid-cooled battery cabinet 25, the battery cabinet 25 includes a plurality of battery modules 27 therein, and each battery module 27 includes a module box filled with a temperature-adjusting insulating liquid and a battery cell located in the battery box and immersed in the temperature-adjusting insulating liquid. The module box is provided with a refrigeration inlet and a refrigeration outlet. And a refrigerant enters the module box from a refrigeration inlet and is discharged from a refrigeration outlet, and the refrigerant submerges the battery monomer in the module box and exchanges heat with the battery monomer in the flowing process.

Optionally, the refrigerant needs to be a refrigeration working medium which is non-conductive, free of secondary pollution, clean, low in toxicity, good in electrical insulation and high in fire extinguishing efficiency, such as heptafluoropropane.

Optionally, when the dew point temperature in the battery cabinet 25 is reduced, the air cooling system can be started at any time to cool and dehumidify the air in the cabinet and be applied by combining the electric heater 46, so that no risk of condensed water generation exists in the battery cabinet 25 module and the space where the module is located.

In some possible embodiments, referring to fig. 2, the air distribution plate 47 is installed at the rear part of the battery cabinet 25, and the air distribution plate 47 divides the battery cabinet 25 into a rear air duct for connecting the ventilator assembly 36 and an installation space for installing the battery module 27, and the installation space is located in front of the rear air duct; the air-homogenizing plate 47 is provided with a plurality of vent holes for communicating the rear air duct with the installation space.

The rear part of the battery cabinet 25 is provided with an air uniform plate 47, the upper end of the air uniform plate 47 is connected with the top plate of the battery cabinet 25, the side edge of the air uniform plate 47 is connected with the side plate of the battery cabinet 25, and the bottom plate of the air uniform plate 47 is connected with the upper end of the fan assembly 36. The air distribution plate 47 divides the inner cavity of the battery cabinet 25 into a front installation space for installing the plurality of battery modules 27 and a rear air duct, which is a gap between the air distribution plate 47 and the rear wall of the battery cabinet 25 for air circulation.

A plurality of vent holes are formed in the air-uniforming plate 47, and the vent holes communicate with the rear channel and the installation space. Air enters the rear channel under the action of the fan assembly 36 and enters the mounting space through the vent holes in the air distribution plate 47, so that the air uniformly enters the rear of the battery modules 27.

A plurality of battery modules 27 are longitudinally arranged in the installation space at intervals, and gaps are reserved between every two adjacent battery modules 27, between the battery modules 27 and the upper end plate of the fan assembly 36, and between the battery modules 27 and the top plate of the battery cabinet 25; the gaps are flow channels communicating the front and rear of the battery module 27; the air entering the rear of the battery module 27 passes through the circulation passage from the rear to the front, and at the same time, there is partial heat exchange with the battery module 27, so as to reduce the temperature of the battery module 27.

A front air duct is arranged between the front end of the battery module 27 and the front wall of the battery cabinet 25, and is communicated with the circulation channel and the lower fan assembly 36; after exchanging heat with the battery module 27, the air enters the front air duct through the circulation channel, is mixed in the front air duct, and then enters the fan assembly 36; and finishing the air cooling circulation.

Optionally, a limiting partition plate is mounted at the lower part of the battery cabinet 25, and the rear end of the limiting partition plate is connected with the air homogenizing plate 47; the lower part of the limiting partition plate is used for installing a fan assembly 36 and forming a lower channel; the upper part of the limit clapboard, the air uniform plate 47 and the side wall of the battery cabinet 25 form an installation space.

Optionally, the spacing spacer is spaced from the battery modules 27.

In some possible embodiments, referring to fig. 2, the fan assembly 36 includes a mounting frame, and a fan 35, an air-cooled evaporator 43 and an electric heater 46 sequentially disposed on the mounting frame from front to back; wherein the mounting rack is fixed on the body of the battery cabinet 25 or on the above-mentioned spacing partition. The fan 35 is arranged on the mounting frame, and the blowing direction of the fan 35 is from front to back; an air-cooled evaporator 43 is arranged at an air outlet of the fan 35, and a plurality of fins extending outwards are arranged on the air-cooled evaporator 43 so as to increase the heat exchange area; an electric heater 46 is further disposed on the other side of the air-cooled evaporator 43, and the electric heater 46 adjusts the temperature of the air entering the interior of the battery cabinet 25 to be higher than the dew point temperature of the battery cabinet 25, so as to avoid the occurrence of water in the air.

Because the surface temperature of the air-cooled evaporator 43 is low, when air passes through the air-cooled evaporator 43, condensed water is easy to appear, and therefore a condensed water collecting tray 45 is arranged below the air-cooled evaporator 43. The water condensed on the air-cooled evaporator 43 flows down into the condensed water collecting tray 45 and is discharged from the inside of the battery cabinet 25 through the condensed water drain hose 44.

Under the normal operating condition of the battery module 27, the air-cooled evaporator 43 at the lower part of the battery cabinet 25 is used in cooperation with the fan, so that the internal air of the battery cabinet 25 flows along the circulating cooling air duct, and the radiant heat of the battery module 27 and the external heat absorbed by the battery cabinet 25 ensure the ambient temperature in the cabinet.

In some possible embodiments, referring to fig. 1 and 2, the air-cooled evaporator 43 is connected to the second liquid supply pipe 31 of the liquid cooling system in the cabinet. The low-temperature and low-pressure liquid refrigerant in the low-pressure circulating barrel 12 enters the second liquid supply pipe 31 through the liquid supply pipeline 19 and is delivered to the lower end of the battery cabinet 25 through the second liquid supply pipe 31; the second liquid supply pipe 31 is connected with the inlet end of the air-cooled evaporator 43 through an auxiliary liquid supply hose 34, and the second air return pipe 39 is connected with the outlet end of the air-cooled evaporator 43 through an auxiliary air return hose 37; making the air-cooled evaporator 43 a heat sink in the air-cooled system. The second gas return pipe 39 communicates with the gas return line 20 and sends the gaseous refrigerant back to the low-pressure circulation tank 12. A second flow rate adjustment valve 32 and an auxiliary expansion valve 33 are provided on the second supply pipe 31, the second flow rate adjustment valve 32 adjusting the flow rate in the second supply pipe 31; the auxiliary expansion valve 33 changes the low-temperature and low-pressure liquid refrigerant in the second liquid supply pipe 31 into a lower-temperature and lower-pressure liquid refrigerant.

At the same time, the first liquid supply pipe 30 communicating with the liquid supply line 19 delivers another part of the refrigerant into the refrigerant inlet of the battery module 27; after heat exchange in the battery module 27, the liquid refrigerant enters the first return pipe 38 from its refrigerant outlet and enters the return pipe 20 via the first return pipe 38.

Because a plurality of battery modules 27 are arranged in each battery cabinet 25, each battery module 27 is respectively communicated with the first liquid supply pipe 30 and the first air return pipe 38 by virtue of the main liquid supply hose 29 and the main air return hose 41; the liquid cooling systems of each battery module 27 in the same battery cabinet 25 are connected in parallel.

Each battery cabinet 25 is used as an independent unit, and the liquid cooling systems corresponding to the plurality of battery cabinets 25 are all arranged in parallel. Each battery cabinet 25 corresponds to one first liquid supply pipe 30 and one first air return pipe 38, and when a certain battery cabinet 25 is maintained, only the first liquid supply pipe 30 corresponding to the battery cabinet 25 needs to be closed.

Alternatively, a first flow rate adjusting valve 28 is provided at an upper portion of the first supply pipe 30, and a second flow rate adjusting valve 32 and an auxiliary expansion valve 33 are provided at the second supply pipe 31. The upper end of the second supply pipe 31 is connected to the upper end of the supply line 19 or the first supply pipe 30, that is, the upper end of the second supply pipe 31 is located above the first flow rate adjustment valve 28.

In some possible embodiments, referring to fig. 1, the phase-change type liquid cooling energy storage heat and humidity separation type refrigeration system further includes an outside-cabinet liquid cooling system, which includes a compressor 2, a condenser 7, a main circuit expansion valve 10, and a low-pressure recycling bin 12; an oil separator 3 is arranged between the compressor 2 and the condenser 7, an oil return pipeline is arranged at the lower end of the oil separator 3, and lubricating oil in the refrigerant enters the oil return pipeline from the oil separator 3, passes through an oil cooler 22, an oil return capillary tube 23 and an oil return electromagnetic valve 24 in sequence and then reenters the compressor 2; the temperature of the refrigerant in the low-pressure circulation tub 12 is higher than the dew point temperature of the air in the battery cabinet 25. Because the temperature of the liquid refrigerant entering the battery module 27 is controlled to be higher than the dew point temperature in the cabinet, the full sensible heat exchange in the battery module 27 is ensured, and the safety of the equipment is further ensured.

The compressor 2 compresses the refrigerant to convert the low-temperature low-pressure liquid refrigerant into a high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant enters the oil separator 3, lubricating oil of the compressor 2 is filtered in the oil separator 3, and the high-temperature high-pressure gaseous refrigerant enters the condenser 7; the high-temperature high-pressure gaseous refrigerant is subjected to heat exchange with low-temperature air in the condenser 7 by external air path power provided by the condensing fan 6, the high-temperature high-pressure gaseous refrigerant is changed into a medium-temperature high-pressure liquid refrigerant after the heat exchange, the medium-temperature high-pressure liquid refrigerant enters the drying filter 9, moisture and impurities contained in the medium-temperature high-pressure liquid refrigerant in the drying filter 9 are adsorbed, the medium-temperature high-pressure liquid refrigerant flows through the main path expansion valve 10 again, and the medium-temperature high-pressure liquid refrigerant is changed into a low-temperature low-pressure liquid refrigerant after being throttled by the main path expansion valve 10 and is conveyed to the low-pressure circulating barrel 12 and is settled to the lower part of the low-pressure circulating barrel 12. Optionally, the condensing fan 6 is a variable frequency fan, and the condensing fan 6 is controlled by the pressure measured by the pressure sensor in front of the condensing fan, and the frequency of the condensing fan increases along with the increase of the pressure. Optionally, a reservoir 8 is also provided between the condenser 7 and the filter-drier 9.

The refrigerant pump 15 provides circulating power to sink the low-temperature and low-pressure liquid refrigerant at the lower part of the low-pressure circulating barrel 12 to the lower part of the low-pressure circulating barrel 12 for full use, and the evaporated low-pressure and low-temperature gaseous refrigerant flows through the oil return spray pipe 18 and then enters the compressor 2 for circulation. The outlet end of the refrigerant pump 15 is provided with a pump outlet check valve 16;

an oil return pipeline is arranged at the lower part of the oil separator 3, high-temperature and high-pressure lubricating oil enters the oil cooler 22 from the oil separator 3, exchanges heat with refrigerant in the oil cooler 22 to become low-temperature and high-pressure lubricating oil, passes through an oil return capillary tube 23 to become low-temperature and low-pressure lubricating oil, passes through an oil return electromagnetic valve 24, is mixed with low-temperature and low-pressure refrigerant gas, and then enters an air suction port of the compressor 2 to finish oil separation and oil return.

An auxiliary cooling circuit is led out between the condenser 7 and the main expansion valve 10, and the auxiliary cooling circuit is connected to the oil cooler 22 for cooling the high-temperature and high-pressure lubricating oil in the oil cooler 22.

The liquid refrigerant at the middle temperature and the high pressure at the outlet of the drying filter 9 flows through the bypass electronic expansion valve 21, is throttled by the bypass electronic expansion valve 21 and then is changed into the liquid refrigerant at the low temperature and the low pressure, and is conveyed to the oil cooler 22 to exchange heat with the high-temperature lubricating oil, and the liquid refrigerant absorbs heat and is evaporated into the gaseous refrigerant at the low temperature and the low pressure, and then is mixed with the gaseous refrigerant returned to the compressor 2 by the main low-pressure circulating barrel 12 and enters the compressor 2.

An oil level switch 4 is arranged in the oil separator 3, when the oil level of the oil separator 3 is higher than the oil level switch 4, the electromagnetic valve is opened for oil return, when the oil temperature measured by the oil cooling and oil outlet temperature sensor is higher than a set value, the auxiliary expansion valve 33 on the auxiliary cooling loop is opened, and the oil temperature is adjusted and controlled to be opened.

Since the oil separator 3 cannot filter 100% of the lubricating oil, a small amount of lubricating oil is circulated in the system and is delivered to the low-pressure circulating drum 12, and the lubricating oil is liquid and cannot effectively flow back to the compressor 2 along with the refrigerant gas. Therefore, an auxiliary oil return pipe is connected to the exhaust pipe arranged at the upper end of the low-pressure circulation, one end of the auxiliary oil return pipe is positioned inside the low-pressure circulation barrel 12, and the upper end of the auxiliary oil return pipe penetrates through the low-pressure circulation barrel 12 and is connected with the exhaust pipe by virtue of an oil return spray pipe 18; an adjusting hand valve and an oil return sight glass 17 are arranged on the auxiliary oil return pipe. During oil return, a small part of refrigerant liquid rich in lubricating oil is directly conveyed to the exhaust pipe through the oil return adjusting hand valve 11 and the oil return liquid viewing mirror 17 by using the principle of negative pressure of the spray pipe, and the exhaust pipe conveys the part of lubricating oil to the compressor 2.

Different oil return holes are formed in the height gradient of an oil return pipeline inside the low-pressure circulating barrel 12, and the oil return adjusting hand valve 11 is adjusted by observing the state of lubricating oil in the oil return liquid viewing lens 17 so as to ensure that the lubricating oil is fully returned.

A low liquid level switch 14 and a high liquid level switch 13 are arranged in the low-pressure circulating barrel 12; the oil return pipe extends to the lower liquid level switch 14, and a plurality of oil return holes are arranged between the lower liquid level switch 14 and the upper liquid level switch 13 at intervals so as to ensure that the mixed state of the refrigerant and the lubricating oil can be recovered in the running state.

Optionally, the number of the oil return holes is three, and the three oil return holes are arranged at intervals along the height direction of the oil return pipe. Wherein, the oil return hole at the lowest part is flush with the low liquid level switch 14, and the oil return hole at the uppermost part is lower than the high liquid level switch 13. The distance between two adjacent oil return holes is consistent.

The oil return pipe section is U-shaped and comprises a first longitudinal pipe section, a transverse pipe section and a second longitudinal pipe section which are sequentially connected; the lower end of the second longitudinal pipe section is positioned at the lower part of the circulating barrel main body, and the open end of the second longitudinal pipe section is positioned at the upper part of the circulating barrel main body; the oil return hole is formed in the side wall of the second longitudinal pipe section.

The first longitudinal pipe section, the transverse pipe section and the second longitudinal pipe section are sequentially connected to form a U-shaped internal oil return pipe, wherein the height of the second longitudinal pipe section is smaller than that of the first longitudinal pipe section. The transverse pipe section is horizontally arranged and is positioned below the low level switch 14. The oil return hole is formed in the second longitudinal pipe section so as to reduce fluctuation of the oil return hole and the liquid level inside the circulating barrel main body when the first longitudinal pipe section returns oil.

Referring to fig. 1 and fig. 2, the control method for the phase-change type liquid-cooling energy-storage heat-moisture separation type refrigeration system includes the following steps:

s1, after a battery is started, closing a liquid cooling system in a cabinet and opening a liquid cooling system outside the cabinet;

s2, when the liquid level in the low-pressure circulating barrel 12 is higher than the low liquid level switch 14 and the temperature in the cabinet is higher than a set value, a second circulating pipeline and an air cooling system of a liquid cooling system in the cabinet are started; the air outlet temperature of the fan assembly 36 is higher than the dew point temperature in the cabinet;

s3, when the temperature of the battery module 27 is higher than a set value, a first circulation pipeline of a liquid cooling system in the cabinet is started;

and S4, when the dew point temperature in the cabinet is reduced, adjusting the flow of a second circulation pipeline of the air cooling system or the working efficiency of the electric heater 46 at any time.

Specifically, after the battery is started, the control unit receives a battery starting working signal, closes all the liquid cooling systems in the cabinet, and opens the liquid cooling systems in the cabinet. The compressor 2 is started to refrigerate until the liquid level in the low-pressure circulating barrel 12 is higher than the low liquid level switch 14 and the temperature in the battery cabinet 25 is higher than a set value, the air cooling system and the second circulating pipeline are started, and air in the battery cabinet 25 is circulated and subjected to heat exchange through the air cooling system; the cooling of the battery modules 27 in the battery cabinet 25 and the air in the battery cabinet 25 is realized. Alternatively, the refrigerant temperature in the low pressure cycle tub 12 is required to be higher than the air dew point temperature in the cabinet, but when the humidity of the battery cabinet 25 is lower than the set point and the dew point temperature is higher than the liquid temperature in the low pressure cycle tub 12, the battery module 27 is allowed to operate.

On the basis of starting the air cooling system, when the temperature of the battery module 27 is higher than a set value, the first circulation pipeline of the liquid cooling system in the cabinet can be started to enhance the refrigeration of the battery module 27.

When the dew point temperature of the air in the cabinet is reduced, the flow rate of the second circulation pipeline of the air cooling system or the working efficiency of the electric heater 46 is adjusted at any time. The heat exchange between the air-cooled evaporator 43 and the air can be increased by increasing the flow of the second circulation pipeline, and the air temperature is reduced to be below the dew point temperature, so that condensed water is separated out from the air; then, when the low-temperature air passes through the electric heater 46, the temperature of the air is raised by the electric heater 46 to a temperature higher than the dew point temperature.

In step S1, before the battery is started, if the temperature in the cabinet is lower than the start setting value, the fan 35 and the electric heater 46 of the fan assembly 36 need to be started until the internal ambient temperature of the battery cabinet 25 reaches the battery safe operation ambient temperature.

Optionally, the system further includes a central control unit 1, a phase-change refrigeration control unit 5, and a battery cabinet temperature control unit 26. The phase-change refrigeration control unit 5 is used for monitoring and controlling the external liquid cooling system of the cabinet; and adjusting the opening state of each pipeline and the valve on the pipeline according to the temperature and the pressure of the refrigerant in the liquid cooling system outside the cabinet. Such as: the phase-change refrigeration control unit 5 is connected with a low liquid level switch 14 and a high liquid level switch 13 in the low-pressure circulating barrel 12, and when the liquid level in the low-pressure circulating barrel 12 is lower than the low liquid level switch 14, the low liquid level switch 14 sends a signal to the phase-change refrigeration control unit 5; the phase change refrigeration control unit 5 sends a signal to a liquid inlet pipe in the low-pressure circulating barrel 12 after receiving the liquid level signal, so that a valve on the liquid inlet pipe is opened, the refrigerant is conveyed into the low-pressure circulating barrel 12, and the liquid level in the low-pressure circulating barrel 12 is raised; meanwhile, the phase-change refrigeration control unit 5 sends a signal to the refrigerant pump 15 to stop the operation of the refrigerant pump 15 and cut off the transmission of the refrigerant to a liquid cooling system in the cabinet.

In addition, the phase change refrigeration control unit 5 also controls the on-off state of the compressor 2, the power of the condensing fan 6, the flow rate of an oil return pipeline, the flow rate of an auxiliary oil return pipe, and the like.

The battery pack temperature control unit 26 is connected to a temperature detection sensor on each battery module 27 in the battery pack 25, a temperature sensor in the battery pack 25, a temperature/humidity sensor 40 in the battery pack 25, the first flow rate adjustment valve 28, the second flow rate adjustment valve 32, the auxiliary expansion valve 33, and the like. When the temperature in the battery cabinet 25 is too high or the temperature of the battery module 27 is high, the battery cabinet temperature control unit 26 sends signals to the first flow rate adjustment valve 28, the second flow rate adjustment valve 32, the auxiliary expansion valve 33, and the like to enhance the cooling effect.

The central control unit 1 is electrically connected with the phase-change refrigeration control unit 5 and the battery cabinet temperature control unit 26, and is used for controlling the phase-change refrigeration control unit 5 and the battery cabinet temperature control unit 26. Central control unit 1 is for the control appearance that collects control by temperature change and liquid level control as an organic whole, observes and controls the appearance like HUEFLOW intelligence multiloop, can realize the communication and control to multinomial data display such as temperature, pressure, liquid level.

The utility model provides a control method of phase transition type liquid cooling energy storage heat and moisture separation type refrigerating system, through the start-up and regulation of control air cooling system, the interior liquid cooling system of cabinet and the exterior liquid cooling system of cabinet, realized the cooling to battery module 27 and the interior air of cabinet; the temperature of the air in the cabinet body is reduced through the air cooling system and the liquid cooling system in the cabinet, the temperature difference between the air in the cabinet and the battery module 27 is reduced, the actual temperature of the air in the battery cabinet 25 is higher than the dew point temperature of the air, and the condition that condensed water is precipitated after the air in the cabinet body is condensed when the air is cooled is avoided.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. Phase change formula liquid cooling energy storage heat moisture separating type refrigerating system, its characterized in that includes:

the battery cabinet is internally provided with a plurality of battery modules; a low-pressure circulating barrel filled with a refrigerant is arranged on the outer side of the battery cabinet;

the air cooling system comprises a fan assembly arranged at the bottom of the inner cavity of the battery cabinet, the fan assembly comprises a fan, an air cooling evaporator and an electric heater which are sequentially arranged from front to back, and gaps between the battery modules and the front and back walls of the battery cabinet and between the adjacent battery modules are mutually communicated to form a circulating cooling air channel; the air outlet temperature of the fan assembly is higher than the dew point temperature of the air in the battery cabinet;

2. The phase-change liquid cooling energy storage heat and humidity separation type refrigeration system according to claim 1, wherein an air uniforming plate is installed at the rear of the battery cabinet, the air uniforming plate divides the battery cabinet into a rear air duct for communicating the fan assembly and an installation space for installing the battery module, and the installation space is located in front of the rear air duct; and a plurality of ventilation holes which are communicated with the rear air duct and the mounting space are formed in the air homogenizing plate.

3. The phase-change liquid cooling energy storage heat and moisture separation type refrigeration system according to claim 2, wherein a plurality of the battery modules are longitudinally arranged in the installation space at equal intervals; a front air duct is arranged between the front end of the battery module and the front side wall of the battery cabinet, and a horizontal air duct is formed by a gap between the adjacent battery modules; the horizontal air duct communicates the rear air duct and the front air duct.

4. The phase-change liquid cooling energy storage heat and moisture separation type refrigeration system according to claim 1, wherein a condensed water collecting tray is provided at a lower portion of the fan assembly, and a condensed water drain hose is provided at a lower end of the condensed water collecting tray.

5. The phase-change liquid cooling energy storage heat and moisture separation refrigeration system of claim 1 wherein the first liquid supply lines of a common liquid supply line are all arranged in parallel.

6. The phase-change liquid cooling energy storage heat and moisture separation refrigeration system of claim 1, further comprising:

the outside-cabinet liquid cooling system comprises a compressor, a condenser, a main path expansion valve and the low-pressure circulating barrel; an oil separator is arranged between the compressor and the condenser, an oil return pipeline is arranged at the lower end of the oil separator, and lubricating oil in the refrigerant enters the oil return pipeline from the oil separator, sequentially passes through the oil cooler, the oil return capillary tube and the oil return electromagnetic valve and then reenters the compressor; the temperature of the refrigerant in the low-pressure circulation barrel is higher than the dew-point temperature of the air in the battery cabinet.

7. The phase-change type liquid cooling energy storage heat and humidity separation refrigeration system according to claim 6, wherein an exhaust pipe on the low-pressure circulation barrel is communicated with the compressor, an auxiliary oil return pipe is further arranged on the low-pressure circulation barrel, one end of the auxiliary oil return pipe is located inside the low-pressure circulation barrel, and the upper end of the auxiliary oil return pipe penetrates through the low-pressure circulation barrel and is connected with the exhaust pipe through an oil return spray pipe; and an adjusting hand valve and an oil return liquid sight glass are arranged on the auxiliary oil return pipe.

8. The phase-change type liquid-cooling energy-storage heat-moisture separation type refrigerating system according to claim 6, wherein an auxiliary cooling circuit is further provided between said condenser and said main circuit expansion valve, said auxiliary cooling circuit being connected to said oil cooler for cooling high-temperature and high-pressure lubricating oil in said oil cooler.