CN220086176U - Multi-cold source heat management system - Google Patents

Abstract

The utility model provides a multi-cold-source heat management system and a control method thereof, wherein the multi-cold-source heat management system comprises: the first heat dissipation loop, the second heat dissipation loop and the refrigeration loop. The first heat dissipation loop is used for providing the secondary refrigerant for cooling the first heat source. The second heat dissipation loop comprises a dry cooler for providing the secondary refrigerant for cooling the second heat source. The refrigeration circuit is used for providing refrigerant. The second heat dissipation loop is communicated with the first heat dissipation loop through the first regulating valve. The refrigerant in the refrigeration circuit exchanges heat with the coolant in the first heat rejection circuit at the first heat exchanger. The dry cooler is communicated with the second heat exchanger and the first heat dissipation loop through a third regulating valve. The multi-cold-source heat management system and the control method thereof provided by the utility model effectively utilize the heat dissipation function of the air cooler, reduce the energy consumption of the system and improve the energy efficiency ratio.

Description

Multi-cold source heat management system

Technical Field

The utility model relates to the technical field of heat management, in particular to a multi-cold-source heat management system.

Background

The battery system of the existing liquid cooling energy storage container mostly adopts liquid cooling, and electrical equipment in the container, such as a switch box, a power distribution cabinet and the like, mostly adopts air cooling for heat dissipation. However, with the increase of the charge-discharge rate of the battery, the heat generation of the electrical equipment is gradually increased, and the operation reliability of the electrical equipment cannot be ensured due to air cooling and heat dissipation.

In the process of implementing the present utility model, the inventor finds that at least the following problems exist in the prior art:

at present, in order to simultaneously meet the heat dissipation requirements of a battery system and electrical equipment, a set of refrigerant circulation system is adopted to simultaneously provide a cold source for the battery system and the electrical equipment. However, since the operating temperature ranges of the electrical device and the battery are different, for example, the battery needs to operate in a lower temperature range, and the electrical device can operate in a higher temperature range, if the operating temperature requirements of the battery system and the electrical device are met at the same time, the operating temperature of the battery system can only be used as a reference, at this time, the power consumption of the refrigerant circulation system is definitely increased, and the energy efficiency ratio is reduced.

Disclosure of Invention

Based on the above, the utility model provides a multi-cold-source heat management system, which solves the problems of high power consumption, low energy efficiency ratio and the like of a refrigerant system in the heat management system in the prior art.

In order to achieve the above object, the technical solution of the embodiment of the present utility model is as follows:

in one aspect, an embodiment of the present utility model provides a multi-cold source thermal management system, including:

the first heat dissipation loop is used for providing the secondary refrigerant as a first heat source for cooling;

the second heat dissipation loop is provided with a dry cooler and is used for providing a secondary refrigerant for cooling a second heat source, and the dry cooler comprises a heat dissipation fan; wherein a temperature difference exists between the first heat source and the second heat source;

a refrigeration circuit for providing a refrigerant,

the second heat dissipation loop is communicated with the first heat dissipation loop through the first regulating valve;

the first heat exchanger and the second heat exchanger are communicated with each other, and the refrigerant in the refrigeration loop and the secondary refrigerant in the first heat dissipation loop exchange heat at the first heat exchanger;

the second regulating valve is arranged at the outlet end of the dry cooler;

the third regulating valve is communicated with the second regulating valve, and the dry cooler is communicated with the second heat exchanger and the first heat dissipation loop through the third regulating valve respectively, so that part of the refrigerating medium in the second heat dissipation loop and the refrigerating medium exchange heat at the second heat exchanger, and part of the refrigerating medium in the second heat dissipation loop enters the first heat dissipation loop.

In one embodiment, the first heat dissipation loop includes a first cooling module, and the first cooling module is sequentially communicated with the first regulating valve and the first heat exchanger and is used for cooling a first heat source;

the second cooling loop comprises a second cooling module, and the second cooling module is sequentially communicated with the dry cooler and the second regulating valve and is used for cooling a second heat source.

In one embodiment, both ends of the first cooling module and the second cooling module are provided with temperature sensors.

In one embodiment, the first heat dissipation circuit further includes a water heater, a first circulation pump, and a first filter, wherein the water heater is disposed between the first heat exchanger and the first cooling module, and is configured to heat the coolant flowing into the first cooling module, the first circulation pump is disposed between the first cooling module and the first regulating valve, and the first filter is disposed between the first cooling module and the first circulation pump.

In one embodiment, the second heat dissipation circuit further includes a second circulation pump and a second filter, the second circulation pump is disposed between the second cooling module and the dry cooler, and the second filter is disposed between the second cooling module and the second circulation pump.

In one embodiment, the refrigeration circuit further includes a third filter and an expansion valve, the expansion valve is disposed between the second heat exchanger and the first heat exchanger along the refrigerant flow direction in the refrigeration circuit, and the third filter is disposed between the second heat exchanger and the expansion valve.

The utility model has at least the following beneficial effects:

the multi-cold-source heat management system comprises a refrigeration loop, a first heat dissipation loop and a second heat dissipation loop, and when the ambient temperature is higher, the first heat exchanger of the refrigeration loop exchanges heat with the secondary refrigerant in the first heat dissipation loop to achieve the purpose of regulating the temperature of a first heat source; the heat exchange is carried out for the second cooling module through the dry cooler, so that the aim of temperature regulation for the second heat source is fulfilled; meanwhile, the dry cooler can exchange heat with the second heat exchanger of the refrigeration loop, so that the loads of the refrigeration loop and the dry cooler are reasonably distributed, and the purposes of saving energy and reducing noise are achieved. When the ambient temperature is at the medium temperature, the main cooler part can participate in the heat exchange work of the first heat dissipation loop through controlling the first regulating valve, the second regulating valve and the third regulating valve, so that the refrigerating capacity requirement of the refrigerating loop is reduced, and the aim of saving energy is fulfilled. When the ambient temperature is lower, the air cooler can completely participate in the heat exchange work of the first heat dissipation loop through controlling the first regulating valve, the second regulating valve and the third regulating valve, and at the moment, the refrigerating loop is closed, so that the energy consumption is greatly reduced. According to the multi-cold-source management system, the third regulating valve is arranged, so that the dry cooler can perform heat exchange with the second cooling module alone and with the second heat exchanger and the first cooling module, different heat exchange schemes can be executed according to the change of the ambient temperature, the consumption of energy sources is greatly reduced, and the whole heat management system has a high energy efficiency ratio.

Drawings

Fig. 1 is a schematic structural diagram of a multi-cold-source thermal management system according to an embodiment of the utility model.

Fig. 2 is a schematic structural diagram of a multi-cold-source thermal management system according to another embodiment of the utility model.

Fig. 3 is a schematic flow diagram of each loop of the multi-cold-source thermal management system of fig. 1 when the current ambient temperature is within a first preset temperature range.

Fig. 4 is a schematic flow diagram of each loop of the multi-cold-source thermal management system of fig. 2 when the current ambient temperature is within the first preset temperature range.

Fig. 5 is a schematic flow diagram of each loop of the multi-cold-source thermal management system of fig. 1 when the current ambient temperature is within a second preset temperature range.

Fig. 6 is a schematic flow diagram of each loop of the multi-cold-source thermal management system of fig. 2 when the current ambient temperature is within a second preset temperature range.

Fig. 7 is a schematic flow diagram of each loop of the multi-cold-source thermal management system of fig. 1 when the current ambient temperature is within a third preset temperature range.

Fig. 8 is a schematic flow diagram of each loop of the multi-cold-source thermal management system of fig. 2 when the current ambient temperature is within a third preset temperature range.

The meaning of the various reference numerals in the drawings is as follows:

10. a first heat dissipation circuit; 11. a first cooling module; 12. a first filter; 13. a first circulation pump; 14. a first regulating valve; 15. a water heater;

20. a second heat dissipation loop; 21. a second cooling module; 22. a second filter; 23. a second circulation pump; 24. a dry cooler; 25. a second regulating valve; 26. a third regulating valve;

30. a refrigeration circuit; 31. a compressor; 32. a second heat exchanger; 33. a third filter; 34. an expansion valve; 35. a first heat exchanger; 36. a temperature sensor;

40. a first connecting line; 50. and a second connecting pipeline.

Detailed Description

The technical scheme of the utility model is further elaborated below by referring to the drawings in the specification and the specific embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the implementations of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1 and 2, a multi-cold source thermal management system according to an embodiment of the present utility model is used for performing zoned thermal management in an energy storage battery container, and includes: a first heat dissipation circuit 10, a second heat dissipation circuit 20 and a refrigeration circuit 30. The first cooling module 11 of the first heat dissipation circuit 10 is used for cooling a first heat source (battery system), and the second cooling module 21 of the second heat dissipation circuit 20 is used for cooling a second heat source (electrical equipment capable of withstanding higher temperatures).

The first heat dissipation circuit 10 includes a first cooling module 11, a first filter 12, a first circulation pump 13, a first regulating valve 14, and a water heater 15, wherein an inlet end of the first filter 12 is communicated with an outlet end of the first cooling module 11, an outlet end of the water heater 15 is communicated with an inlet end of the first cooling module 11, and the water heater 15, the first cooling module 11, the first filter 12, the first circulation pump 13, and the first regulating valve 14 are sequentially connected in series and connected to an evaporation side of the refrigeration circuit 30. The water heater 15 is used for heating the coolant in the first heat dissipation circuit 10, for example, when the battery system cannot normally perform the charge and discharge operation due to the low ambient temperature, the water heater 15 can heat the coolant to heat the battery system.

The second heat dissipation circuit 20 includes a second cooling module 21, a second filter 22, a second circulation pump 23, a dry cooler 24 and a second regulating valve 25, wherein an inlet end of the second filter 22 is communicated with an outlet end of the second cooling module 21, an inlet end of the second regulating valve 25 is connected to an outlet end of the dry cooler 24, an outlet end of the second regulating valve 25 is connected to an inlet end of the second cooling module 21, the second filter 22, the second circulation pump 23, the dry cooler 24 and the second regulating valve 25 are sequentially connected in series to form a circuit, and the dry cooler 24 includes a heat dissipation fan. The coolant in the main cooler 24 exchanges heat with the cool air of the outside environment to cool the electrical equipment. The working mode of the dry cooler 24 enables the energy consumption of the dry cooler to be very low, and the cooling requirement of electrical equipment with higher tolerance temperature can be completely met, so that the stable operation of the electrical equipment is ensured.

The refrigeration circuit 30 comprises a compressor 31, a second heat exchanger 32, a third filter 33, an expansion valve 34 and a first heat exchanger 35 which are sequentially connected in series, wherein the refrigerant is compressed into high-temperature and high-pressure refrigerant steam through the compressor 31, heat exchange is performed in a first channel of the second heat exchanger 32, condensation is performed to obtain high-temperature and high-pressure refrigerant liquid, the high-temperature and high-pressure refrigerant liquid is throttled and depressurized through the expansion valve 34, and then enters the first channel of the first heat exchanger 35 to perform heat exchange and evaporation to obtain low-temperature and low-pressure refrigerant steam, and one-time refrigerant circulation is completed.

In this embodiment, the first heat exchanger 35 is a plate heat exchanger, the coolant in the first heat dissipation circuit 10 exchanges heat with the coolant in the refrigeration circuit 30 at the first heat exchanger 35, the coolant in the refrigeration circuit 30 cools the coolant in the first heat dissipation circuit 10, and the cooled coolant is delivered to the first cooling module 11 via the water heater 15, so as to cool the battery system.

As shown in fig. 1 and 2, the second heat exchanger 32 may be a conventional air-cooled heat exchanger (as shown in fig. 2), or may be a liquid-cooled plate heat exchanger (as shown in fig. 1). When a plate heat exchanger is used for the second heat exchanger 32, a third regulating valve 26 is also added. When the second heat exchanger 32 adopts the liquid cooling heat exchange mode, the dry cooler 24 is used as a cold source for heat exchange of the second heat exchanger 32. When the second heat exchanger 32 exchanges heat through the dry cooler 24, a traditional air-cooled heat exchange mode is changed, so that the overall structure is compact, noise can be reduced, and the overall improvement of performance is facilitated.

To improve the accuracy of temperature control of the refrigeration circuit 30, a plurality of temperature sensors 36 may be added to the refrigeration circuit 30 to achieve the purpose of accurate temperature control, for example, one temperature sensor 36 may be disposed at the inlet side and the outlet side of the compressor 31, and one temperature sensor 36 may be disposed between the second heat exchanger 32 and the third filter 33.

To provide the overall thermal management system with multiple modes of regulation, a first connecting line 40 and a second connecting line 50 may also be provided, the first connecting line 40 being connected between one outlet of the third regulating valve 26 and the inlet of the water heater 15. The second connecting line 50 is connected between an outlet of the first regulating valve 14 and an inlet of the second cooling module 21. The first regulating valve 14, the second regulating valve 25 and the third regulating valve 26 are all three-way valves. Wherein, the inlet end of the first regulating valve 14 is connected with the outlet end of the first circulating pump 13, one outlet end of the first regulating valve 14 is connected with the inlet end of the second cooling module 21, and the other outlet end of the first regulating valve 14 is connected with the first heat exchanger 35, so that the refrigerant in the refrigeration circuit 30 exchanges heat with the refrigerating medium in the first heat dissipation circuit 10 at the first heat exchanger 35. That is, the first regulator valve 14 can proportionally split the coolant exiting the first cooling module 11 to exchange heat with all or a portion of the coolant in the first heat exchanger 35 and to allow part or all of the coolant to enter the second cooling module 21 for heat exchange through the dry cooler 24. The inlet of the second regulating valve 25 is connected to the outlet of the main cooler 24, and the two outlets of the second regulating valve 25 are respectively connected to the inlet of the second cooling module 21 and the inlet of the water heater 15 (directly or via the third regulating valve 26), i.e. the second regulating valve 25 can split the coolant flowing out of the main cooler 24 proportionally, so that all or part of the coolant enters the water heater 15 to cool the first cooling module 11, and part of the coolant enters the second cooling module 21 to cool the second cooling module 21. The inlet end of the third regulating valve 26 is connected to one outlet end of the second regulating valve 25, one outlet end of the third regulating valve 26 is connected to the inlet end of the water heater 15, and the other outlet end of the third regulating valve 26 is connected to the second heat exchanger 32, so that the coolant in the second heat dissipation circuit 20 and the refrigerant in the refrigeration circuit 30 exchange heat at the second heat exchanger 32. That is, the third regulator valve 26 can proportionally split the coolant from the second regulator valve 25, allowing all or a portion of the coolant to enter the second heat exchanger 32 for heat exchange with the refrigerant in the refrigeration circuit 30, and allowing a portion of the coolant to enter the water heater 15 for cooling the first cooling module 11.

In the present embodiment, the first regulator valve 14, the second regulator valve 25, and the third regulator valve 26 are all electric three-way regulator valves. The multi-cold source thermal management system of the embodiment may further include a control system, where the control system is configured to control each loop system.

When the second heat exchanger 32 is an air-cooled heat exchanger, the third regulating valve 26 is not required, and one outlet end of the second regulating valve 25 is directly connected to the inlet of the water heater 15 through the first connecting line 40.

In another embodiment of the present utility model, a control method is further provided for the multi-cold source heat treatment system of the above embodiment, including the following steps:

s1, respectively setting a first preset temperature range T01, a second preset temperature range T02, a third preset temperature range T03 and a preset coolant temperature range T of the second cooling module 21 _G And a predetermined coolant temperature range T of the first cooling module 11 _D 。

The first preset temperature range T01 is a preset first environmental temperature range, specifically, the first preset temperature range T01 is: t01 is more than or equal to 25 ℃ and less than 55 ℃. The second preset temperature range T02 is a preset second environmental temperature range, specifically, the second preset temperature range T02 is: t02 is less than or equal to 25 ℃ and is more than or equal to 5 ℃. The third preset temperature range T03 is a preset third environmental temperature range, and specifically the third preset temperature range T03 is: t03 is less than or equal to-30 ℃ and less than 5 ℃. Wherein T01 > T02 > T03, i.e., the first preset temperature range T01 is a high temperature environment, the second preset temperature range T02 is a medium temperature environment, and the third preset temperature range T03 is a low temperature environment.

The preset coolant temperature range T of the second cooling module 21 _G For the preset liquid inlet temperature range of the second cooling module 21, the preset coolant temperature range T of the second cooling module 21 is specific _G Can be set according to the actual working temperature requirement of the electrical equipment, for example, 15 ℃ less than or equal to T _G The temperature is less than or equal to 50 ℃; the preset coolant temperature range T of the first cooling module 11 _D For the preset liquid inlet temperature range of the first cooling module 11, the preset coolant temperature range T of the first cooling module 11 is specific _D Can be set according to the actual operating temperature requirement of the battery system, for example, 15 ℃ T _D ≤20℃。

S2, detecting the current environment temperature T1.

S3, judging the temperature range of the current environment temperature T1, firstly judging whether T1 epsilon T01 is met, if yes, executing step S4, if not, continuously judging whether T1 epsilon T02 is met, if yes, executing step S5, if not, judging whether T1 epsilon T03 is met, and if yes, executing step S6.

S4, controlling the first heat dissipation circuit 10, the second heat dissipation circuit 20 and the refrigeration circuit 30 to be respectively conducted.

Specifically, the control system controls the first regulating valve 14 to open the coolant passage from the first cooling module 11 to the first heat exchanger 35, and controls the first regulating valve 14 to close the coolant passage from the first cooling module 11 to the second cooling module 21; the second regulating valve 25 is controlled to be opened at its inlet and outlet, the third regulating valve 26 is controlled to open the coolant passage from the main cooler 24 to the second heat exchanger 32 (the third regulating valve 26 is controlled only when the thermal management system includes the third regulating valve 26), and the third regulating valve 26 is controlled to shut off the coolant passage from the main cooler 24 to the first cooling module 11.

S4.1, respectively detecting the feed-in temperature T2 of the second cooling module 21 and the feed-in temperature T3 of the first cooling module 11.

S4.2, judging whether T2 is at T _G If yes, keeping the current control state unchanged; if not, the rotation speed of the heat radiation fan of the air cooler 24 is adjusted according to the judgment result until T2 is at T _G Is within a preset range of (a).

S4.3, judging whether T3 is at T _D If yes, keeping the current control state unchanged; if not, adjusting the operation parameters of the refrigeration circuit 30 according to the judgment result until T3 is T _D Is within a preset range of (a).

At this time, since the ambient temperature is high, the cooling sources of the first heat dissipation circuit 10 are all provided by the refrigeration circuit 30, the cooling sources of the second heat dissipation circuit 20 are all provided by the drier-cooler 24, and the circuit formed by the first heat dissipation circuit 10 and the circuit formed by the second heat dissipation circuit 20 work independently.

As shown in fig. 3 and 4, at this time, the coolant circulation process of the first heat dissipation circuit 10 is as follows: the secondary refrigerant exchanges heat with the refrigerant of the first heat exchanger 35 through the first heat exchanger 35 and then enters the first cooling module 11 through the water heater 15 to absorb the heat productivity of the battery system; after the temperature of the battery system is reduced, the secondary refrigerant is filtered by the first filter 12, then enters the first circulating pump 13 for pressurization, and enters the first heat exchanger 35 through the first regulating valve 14 to complete one-time circulation.

At this time, the coolant circulation process of the second heat dissipation circuit 20 is as follows: the secondary refrigerant enters the second cooling module 21 to absorb the heat productivity of the electrical equipment through the second regulating valve 25 after undergoing heat exchange and temperature reduction through the dry cooler 24; after the temperature of the electric equipment is reduced, the secondary refrigerant is filtered by the second filter 22, pressurized by the second circulating pump 23 and returned to the dry cooler 24, and one cycle is completed.

When the plate heat exchanger is adopted as the second heat exchanger 32 in the refrigeration loop 30 in the thermal management system, after the secondary refrigerant in the second heat dissipation loop 20 is subjected to heat exchange and temperature reduction through the main cooler 24, part of the secondary refrigerant firstly passes through the second regulating valve 25, then passes through the third regulating valve 26 and enters the second heat exchanger 32, absorbs the heat of the refrigerant of the second heat exchanger 32, and then returns to the main cooler 24 after being pressurized through the second circulating pump 23, so that circulation is completed.

At this time, the refrigerant circulation process of the refrigeration circuit 30 is as follows: the refrigerant vapor with low temperature and low pressure is compressed into refrigerant vapor with high temperature and high pressure through the air suction port of the compressor 31, exchanges heat with the secondary refrigerant at the outlet of the dry cooler 24 in the second heat exchanger 32 (or exchanges heat with the outside air through the inner cooling type heat exchanger), condenses into refrigerant liquid with high temperature and high pressure, enters the first heat exchanger 35 to exchange heat with the secondary refrigerant of the first heat exchanger 35 after being throttled and depressurized by the electronic expansion valve 34, evaporates into refrigerant vapor with low temperature and low pressure, returns to the compressor 31, and completes one cycle.

S5, controlling the first heat dissipation loop 10, the second heat dissipation loop 20 and the refrigeration loop 30 to be respectively conducted, simultaneously controlling the liquid outlet end of the first cooling module 11 to be conducted to the liquid inlet end of the second cooling module 21, and controlling the liquid outlet end of the drier-cooler 24 to be conducted to the liquid inlet end of the first cooling module 11.

Specifically, the control system controls the opening and closing of the first regulating valve 14 to be fully opened, controls the opening and closing of the second regulating valve 25 to be fully opened and controls the opening and closing of the third regulating valve 26 to be fully opened (the operation of the third regulating valve 26 is performed only when the third regulating valve 26 is provided).

S5.1, detecting the feed-in temperature T2 of the second cooling module 21 and the feed-in temperature T3 of the first cooling module 11 respectively.

S5.2, judging T2 epsilon T _G If yes, keeping the current control state unchanged; if not, the rotation speed of the heat radiation fan of the drier-cooler 24, the opening of the first regulating valve 14 and the opening of the second regulating valve 25 are regulated according to the judgment result until T2 is at T _G Is within a preset range of (a).

S5.3, judging T3 epsilon T _D If yes, keeping the current control state unchanged; if not, the operation parameters of the refrigeration circuit 30, the opening of the first regulating valve 14 and the opening of the second regulating valve 25 are regulated according to the judgment result until T3 is at T _D Is within a preset range of (a).

At this time, the ambient temperature is at a medium level, and is neither too high nor too low, so that the first regulator valve 14, the second regulator valve 25, the third regulator valve 26 and the connecting pipeline are used to make the air cooler 24 participate in the heat dissipation operation of a part of the first heat dissipation circuit 10, thereby effectively reducing the energy consumption.

As shown in fig. 5 and 6, at this time, the coolant circulation process of the first heat dissipation circuit 10 is as follows: the secondary refrigerant exchanges heat with the refrigerant of the first heat exchanger 35 to cool, enters the first cooling module 11 through the water heater 15 to absorb the heat productivity of the battery system, passes through the first filter 12 after cooling the battery system, enters the first circulating pump 13 to be pressurized, and enters the first heat exchanger 35 after passing through the first regulating valve 14 to complete one-time circulation; the other part passes through the first regulating valve 14 and then enters the second cooling module 21 to be circulated together with the secondary refrigerant of the second cooling module 21.

At this time, the coolant circulation process of the second heat dissipation circuit 20 is as follows: after the secondary refrigerant is subjected to heat exchange and temperature reduction through the dry cooler 24, part of the secondary refrigerant enters the second cooling module 21 to absorb the heat productivity of the electrical equipment after passing through the second regulating valve 25, and after the secondary refrigerant is subjected to temperature reduction for the electrical equipment, the secondary refrigerant passes through the second filter 22, is pressurized through the second circulating pump 23 and returns to the dry cooler 24, so that one cycle is completed; the other part of the coolant is shunted again through the third regulating valve 26 after passing through the second regulating valve 25, and the shunted part of the coolant is returned to the first cooling module 11 through the water heater 15 for absorbing the heating value of the battery system and is circulated together with the coolant of the first heat dissipation circuit 10; the other part of the separated flow enters the second heat exchanger 32 (the part of the separated flow is included when the third regulating valve 26 is included in the thermal management system), absorbs the heat of the refrigerant of the second heat exchanger 32, is pressurized by the second circulating pump 23, and returns to the dry cooler 24 to complete the cycle.

At this time, the circulation process of the refrigerant in the refrigeration circuit 30 is the same as that in step S3.1, and will not be described again.

S6, controlling the refrigeration loop 30 to be closed, controlling the liquid outlet end of the first cooling module 11 to be communicated with the liquid inlet end of the second cooling module 21, and controlling the liquid outlet end of the drier-cooler 24 to be communicated with the liquid inlet end of the first cooling module 11.

Specifically, the control system controls the first regulating valve 14 to open the coolant passage from the first cooling module 11 to the second cooling module 21, and controls the first regulating valve 14 to close the coolant passage from the first cooling module 11 to the first heat exchanger 35; controlling the second regulating valve 25 to conduct the coolant passage from the dry cooler 24 to the third regulating valve 26 (if the third regulating valve 26 is not included in the thermal management system, the passage of the second regulating valve 25 connecting the dry cooler 24 and the water heater 15 is controlled to be opened), and controlling the second regulating valve 25 to disconnect the coolant passage from the dry cooler 24 to the second cooling module 21; the third regulator valve 26 is controlled to open the coolant passage from the second regulator valve 25 to the first cooling module 11 (without performing the regulating step of the third regulator valve 26 if the third regulator valve 26 is not included in the thermal management system), and the third regulator valve 26 is controlled to close the coolant passage from the second regulator valve 25 to the second heat exchanger 32.

S6.1, respectively detecting the feed-in temperature T2 of the second cooling module 21 and the feed-in temperature T3 of the first cooling module 11.

S6.2, judging T2 epsilon T _G If yes, keeping the current control state unchanged; if not, according to the judging result, the rotation speed of the heat radiation fan of the drier-cooler 24, the opening degree of the first regulating valve 14 and the second regulating valveThe opening of the regulating valve 25 is regulated until T2 is at T _G Is within a preset range of (a).

S6.3, judging T3 epsilon T _D If yes, keeping the current control state unchanged; if not, the operation parameters of the refrigeration circuit 30, the opening of the first regulating valve 14 and the opening of the second regulating valve 25 are regulated according to the judgment result until T3 is at T _D Is within a preset range of (a).

At this time, because the ambient temperature is low, the temperature adjustment requirements of the battery system and the electrical equipment can be met only by the heat exchange of the dry cooler 24, and therefore, the refrigeration loop 30 is closed, and the consumption of energy sources is greatly saved.

As shown in fig. 7 and 8, at this time, the circulation process of the coolant is as follows: the secondary refrigerant passes through the second regulating valve 25 and the third regulating valve 26 after heat exchange and cooling of the dry cooler 24, enters the water heater 15, enters the first cooling module 11 to absorb the heat productivity of the battery system, passes through the first filter 12 after cooling the battery system, enters the first circulating pump 13 to be pressurized, enters the second cooling module 21 to absorb the heat productivity of the electrical equipment, passes through the second filter 22 after cooling the electrical equipment, passes through the second circulating pump 23 to be pressurized, and returns to the dry cooler 24 to complete one cycle.

At this time, the circulation process of the refrigeration circuit 30 is the same as that in step S3.1, and will not be described again.

According to the embodiment of the utility model, the heat dissipation requirements of the battery system and the electrical equipment are met through a liquid cooling scheme, the heat dissipation capability of the dry cooler is fully utilized, the heat dissipation loops of the first cooling module and the second cooling module are coupled through the electric three-way regulating valve, the proportion of the system excessively relying on the circulation heat dissipation of the refrigerant is reduced, and the operation energy efficiency of the whole thermal management system is improved.

According to the embodiment of the utility model, through the opening adjustment of the electric three-way adjusting valve and the adjustment of the speed of the air dryer and the air cooler, the risk of condensation in the pipeline caused by excessive cooling of the refrigerating medium under the working condition of low ambient temperature can be avoided.

When the second heat exchanger of the refrigeration circuit adopts a liquid cooling heat exchange mode, the cold source of the second heat exchanger comes from the main cooler of the high-temperature region cooling circuit, and the opening degree and the state of the electric three-way regulating valve are controlled to realize cooling heat exchange of the refrigerant system. The defects of large noise and large volume when the refrigerant system adopts air cooling heat dissipation are overcome, the whole structure of the system is compact, the noise is reduced, and the whole performance of the system is effectively improved.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (6)

1. A multiple cold source thermal management system, comprising:

the first heat dissipation loop is used for providing the secondary refrigerant as a first heat source for cooling;

the second heat dissipation loop is provided with a dry cooler and is used for providing a secondary refrigerant for cooling a second heat source, and the dry cooler comprises a heat dissipation fan; wherein a temperature difference exists between the first heat source and the second heat source;

a refrigeration circuit for providing a refrigerant;

the second heat dissipation loop is communicated with the first heat dissipation loop through the first regulating valve;

the first heat exchanger and the second heat exchanger are communicated with each other, and the refrigerant in the refrigeration loop and the secondary refrigerant in the first heat dissipation loop exchange heat at the first heat exchanger;

the second regulating valve is arranged at the outlet end of the dry cooler;

the third regulating valve is communicated with the second regulating valve, and the dry cooler is communicated with the second heat exchanger and the first heat dissipation loop through the third regulating valve respectively, so that part of the refrigerating medium in the second heat dissipation loop and the refrigerating medium exchange heat at the second heat exchanger, and part of the refrigerating medium in the second heat dissipation loop enters the first heat dissipation loop.

2. The multiple heat sink thermal management system of claim 1, wherein the first heat dissipation loop comprises a first cooling module in communication with the first regulator valve and the first heat exchanger in sequence for cooling a first heat source;

the second cooling loop comprises a second cooling module, and the second cooling module is sequentially communicated with the dry cooler and the second regulating valve and is used for cooling a second heat source.

3. The multiple heat sink thermal management system of claim 2, wherein the first cooling module and the second cooling module are provided with temperature sensors at both ends.

4. The multiple heat sink thermal management system of claim 3, wherein the first heat dissipation loop further comprises a water heater disposed between the first heat exchanger and the first cooling module for heating the coolant flowing into the first cooling module, a first circulation pump disposed between the first cooling module and the first regulator valve, and a first filter disposed between the first cooling module and the first circulation pump.

5. The multiple heat sink thermal management system of claim 3, wherein the second heat dissipation loop further comprises a second circulation pump and a second filter, the second circulation pump disposed between the second cooling module and the dry cooler, the second filter disposed between the second cooling module and the second circulation pump.

6. The multiple heat sink thermal management system of claim 3, wherein the refrigeration circuit further comprises a third filter and an expansion valve, the expansion valve disposed between the second heat exchanger and the first heat exchanger along the refrigerant flow direction in the refrigeration circuit, the third filter disposed between the second heat exchanger and the expansion valve.