Energy storage direct cooling system

Abstract

The invention belongs to the technical field of energy storage systems, and discloses an energy storage direct cooling system which comprises a compressor, a condenser assembly, an expansion valve, a liquid storage device, a refrigerant pump, a liquid separator, a battery cluster and a valve piece. A refrigerant outlet of the compressor is connected with a first port of the first condenser, the two ends of the expansion valve are connected with a second port of the first condenser and a refrigerant inlet of the liquid storage device respectively, and the two ends of the refrigerant pump are connected with a first refrigerant outlet of the liquid storage device and a refrigerant inlet of the liquid separator respectively. The two ends of the battery cluster are connected with a refrigerant outlet of the liquid separator and a refrigerant inlet of the liquid storage device respectively, a second refrigerant outlet of the liquid storage device is connected with a refrigerant inlet of the compressor, and the valve piece is located between the refrigerant inlet of the compressor and the second refrigerant outlet of the liquid storage device. A liquid refrigerant can be prevented from entering the air suction side of the compressor to cause liquid impact; the self-circulation of the refrigerant in the system can be realized, and the temperature consistency of the batteries in the battery cluster is improved; and the system integration degree is high.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to an energy storage direct cooling system. Background Art

[0002] With the development of new energy technology, containerized energy storage systems have been increasingly used in new energy, photovoltaic, and power stations due to their advantages such as smaller footprint, convenient installation and transportation, etc. As a result, the cooling systems of dedicated containerized energy storage systems are also increasingly moving towards high-performance and high-stability technologies. Among them, the temperature control of the battery pack is a very important technical indicator.

[0003] At present, most energy storage battery thermal management systems use direct battery cooling, that is, the refrigerant directly enters the battery cold plate to cool the battery. However, one problem with this cooling method is that the refrigerant directly enters the cold plate after passing through the expansion valve, and the two-phase refrigerant is difficult to evenly distribute in the liquid distributor. In addition, when the heating of each battery in the battery cluster is inconsistent, it is impossible to accurately distribute different cooling amounts to each cold plate to ensure the temperature of the cold plate. Another problem is that in order to ensure the temperature of the cold plate, the battery outlet overheating is very small, and some cold plate outlets are prone to liquid. If it enters the compressor for suction, it will cause liquid hammer. Therefore, it is urgent to propose an energy storage direct cooling system to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide an energy storage direct cooling system, which can prevent liquid refrigerant from entering the suction side of the compressor to cause liquid hammer; it can also realize the self-circulation of the refrigerant in the system and improve the temperature consistency of the batteries in the battery cluster; and the system has high integration.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An energy storage direct cooling system includes a compressor, a condenser assembly, an expansion valve, a liquid storage tank, a refrigerant pump, a liquid distributor, a battery cluster and a valve member. The condenser assembly includes a first condenser and a condensing fan. The condensing fan is located on one side of the first condenser, wherein:

[0007] The refrigerant outlet of the compressor is connected to the first port of the first condenser, the two ends of the expansion valve are respectively connected to the second port of the first condenser and the refrigerant inlet of the liquid accumulator, the two ends of the refrigerant pump are respectively connected to the refrigerant first outlet of the liquid accumulator and the refrigerant inlet of the liquid distributor, the two ends of the battery cluster are respectively connected to the refrigerant outlet of the liquid distributor and the refrigerant inlet of the liquid accumulator, the refrigerant second outlet of the liquid accumulator is connected to the refrigerant inlet of the compressor, and the valve member is located between the refrigerant inlet of the compressor and the refrigerant second outlet of the liquid accumulator.

[0008] As an optional technical solution of the energy storage direct cooling system, the energy storage direct cooling system also includes a heater, and the heater is arranged in the refrigerant cycle driven by the refrigerant pump.

[0009] As an optional technical solution for the energy storage direct cooling system, the energy storage direct cooling system also includes an oil separator and a solenoid valve, the refrigerant inlet and outlet of the oil separator are respectively connected to the compressor and the first condenser, the oil outlet of the oil separator is connected to the refrigerant inlet of the compressor, the oil outlet of the oil separator is located at the bottom of the oil separator, the two ends of the solenoid valve are respectively connected to the third refrigerant outlet of the liquid accumulator and the valve member, and the third refrigerant outlet of the liquid accumulator is located at the bottom of the liquid accumulator.

[0010] As an optional technical solution for the energy storage direct cooling system, the valve component includes a two-way valve, one end of the two-way valve is respectively connected to the refrigerant second outlet of the liquid storage tank and the solenoid valve, and the other end of the two-way valve is respectively connected to the refrigerant inlet of the compressor and the oil outlet of the oil separator.

[0011] As an optional technical solution for the energy storage direct cooling system, the valve component includes a first three-way valve, and the energy storage direct cooling system also includes a second three-way valve, the ath interface of the first three-way valve is respectively connected to the refrigerant outlet of the oil separator and the first port of the first condenser, the bth interface of the first three-way valve is respectively connected to the refrigerant inlet of the compressor and the solenoid valve, and the cth interface of the first three-way valve is connected to the refrigerant second outlet of the liquid accumulator; the ath interface of the second three-way valve is respectively connected to the refrigerant inlet of the liquid accumulator and the refrigerant outlet of the expansion valve, the bth interface of the second three-way valve is respectively connected to the second port of the first condenser and the refrigerant inlet of the expansion valve, and the cth interface of the second three-way valve is connected to the refrigerant outlet of the battery cluster.

[0012] As an optional technical solution for the energy storage direct cooling system, the expansion valve and the solenoid valve are both closed, and in the first three-way valve, only the ath interface of the first three-way valve and the cth interface of the first three-way valve are connected, and in the second three-way valve, only the bth interface of the second three-way valve and the cth interface of the second three-way valve are connected.

[0013] As an optional technical solution for the energy storage direct cooling system, the valve component includes a two-way valve, one end of the two-way valve is respectively connected to the second refrigerant outlet of the liquid storage device and the solenoid valve, and the other end of the two-way valve is respectively connected to the refrigerant inlet of the compressor and the oil outlet of the oil separator; the energy storage direct cooling system also includes a third three-way valve, and the condenser assembly also includes a second condenser, the ath interface of the third three-way valve is connected to the second port of the second condenser, and the bth interface of the third three-way valve is respectively connected to the first port of the second condenser, the refrigerant inlet of the liquid storage device and the refrigerant outlet of the expansion valve.

[0014] As an optional technical solution for the energy storage direct cooling system, the expansion valve, the solenoid valve and the two-way valve are all closed, and in the third three-way valve, only the ath interface of the third three-way valve and the cth interface of the third three-way valve are connected.

[0015] As an optional technical solution for the energy storage direct cooling system, the ath interface of the third three-way valve, the bth interface of the third three-way valve and the cth interface of the third three-way valve are interconnected.

[0016] As an optional technical solution for the energy storage direct cooling system, the two-way valve is an electric ball valve.

[0017] Beneficial effects of the present invention:

[0018] The energy storage direct cooling system provided by the present invention comprises a compressor, a condenser assembly, an expansion valve, a liquid storage tank, a refrigerant pump, a liquid distributor, a battery cluster and a valve member. The condenser assembly comprises a first condenser and a condensing fan, and the condensing fan is located on one side of the first condenser to increase the heat exchange efficiency of the first condenser. On the one hand, when the batteries in the battery cluster need to be cooled, the compressor is started, and the compressor can compress the sucked low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant for discharge; the high-temperature and high-pressure gaseous refrigerant enters the first condenser, dissipates heat in the first condenser and becomes medium-temperature and high-pressure liquid refrigerant; then the medium-temperature and high-pressure liquid refrigerant is throttled and depressurized by the expansion valve to form a low-temperature and low-pressure gas-liquid two-phase refrigerant; after the gas-liquid two-phase refrigerant enters the liquid reservoir, the liquid refrigerant is driven by the refrigerant pump to enter the liquid distributor, and the liquid distributor distributes the liquid refrigerant to each battery cold plate in the battery cluster, outputs the cooling capacity of the system, absorbs the heat generated by the batteries in the battery cluster, and the evaporated or partially evaporated refrigerant merges with the gas-liquid two-phase refrigerant after the expansion valve, and enters the liquid reservoir together, where the gas refrigerant is discharged from the top of the liquid reservoir and returns to the suction side of the compressor through the valve member, completing the cooling process of the batteries in the battery cluster. First, the refrigerant second outlet of the liquid accumulator is set at the top of the liquid accumulator, and the refrigerant outlet of the battery cluster is connected to the refrigerant inlet of the liquid accumulator, so that the evaporated refrigerant passes through the liquid accumulator again, leaving the liquid refrigerant that may be carried in the liquid accumulator, and then uses the characteristics of the gaseous refrigerant to make the gaseous refrigerant enter the suction side of the compressor from the refrigerant second outlet of the liquid accumulator, avoiding liquid refrigerant entering the suction side of the compressor and causing liquid hammer. Secondly, the energy storage direct cooling system also pumps refrigerant to the battery cluster through a refrigerant pump, which can fully supply liquid to the battery cluster without worrying about liquid hammer caused by the compressor sucking in liquid. On the other hand, when the temperature of the batteries in the battery cluster after cooling is uneven, the compressor stops running, and the expansion valve and valve parts are closed to prevent the refrigerant from entering the compressor and the first condenser. The liquid refrigerant enters the liquid distributor through the drive of the refrigerant pump, and the liquid refrigerant is then distributed to each battery cold plate in the battery cluster through the liquid distributor. If the temperature of some batteries in the battery cluster is higher than the saturation temperature of the refrigerant at this time and pressure, the refrigerant evaporates and absorbs heat to cool the battery; if the temperature of some batteries in the battery cluster is lower than the saturation temperature of the refrigerant at this time and pressure, the refrigerant releases heat to warm the battery, that is, the refrigerant partially evaporates or partially maintains liquid state and is discharged from the battery cluster and then merged into the liquid storage device, realizing the self-circulation of the refrigerant in the system, solving the problem of poor temperature consistency of the batteries in the battery cluster after cooling in the prior art. On the other hand, the energy storage direct cooling system integrates the refrigeration mode and the self-circulation mode, and has a high degree of integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a general schematic diagram of the energy storage direct cooling system provided in the first embodiment of the present invention;

[0020] Figure 2This is a schematic diagram of the cooling mode of the energy storage direct cooling system provided in the first embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the self-circulation mode of the energy storage direct cooling system provided in the first embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the heating mode of the energy storage direct cooling system provided in the first embodiment of the present invention;

[0023] Figure 5 is a general schematic diagram of the energy storage direct cooling system provided in the second embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the cooling mode of the energy storage direct cooling system provided in the second embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the self-circulation mode of the energy storage direct cooling system provided in the second embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the heating mode of the energy storage direct cooling system provided in the second embodiment of the present invention;

[0027] Fig. 9 This is a principle diagram of the natural cooling mode of the energy storage direct cooling system provided in the second embodiment of the present invention;

[0028] Fig.10 is a general schematic diagram of the energy storage direct cooling system provided in the third embodiment of the present invention;

[0029] Fig.11 This is a schematic diagram of the cooling mode of the energy storage direct cooling system provided in the third embodiment of the present invention;

[0030] Fig.12 This is a schematic diagram of the self-circulation mode of the energy storage direct cooling system provided in the third embodiment of the present invention;

[0031] Fig.13 This is a schematic diagram of the heating mode of the energy storage direct cooling system provided in the third embodiment of the present invention;

[0032] Fig.14 This is a principle diagram of the natural cooling mode of the energy storage direct cooling system provided in the third embodiment of the present invention;

[0033] Fig.15 It is a schematic diagram of the combined refrigeration mode of the energy storage direct cooling system provided in the third embodiment of the present invention.

[0034] In the figure:

[0035] 1. Compressor; 2. Oil separator; 3. First condenser; 4. Expansion valve; 5. Two-way valve; 6. Solenoid valve; 7. Liquid reservoir; 8. Refrigerant pump; 9. Liquid distributor; 10. Battery cluster; 11. Second three-way valve; 12. First three-way valve; 13. Check valve; 14. Heater; 15. Second condenser; 16. Third three-way valve; 17. Condensing fan. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] Embodiment 1

[0041] The energy storage direct cooling system provided in this embodiment can prevent liquid refrigerant from entering the suction side of the compressor 1 to cause liquid hammer; it can also realize self-circulation of the refrigerant in the system and improve the temperature consistency of the batteries in the battery cluster 10.

[0042] Specific as Figure 1 As shown, the energy storage direct cooling system includes a compressor 1, a condenser assembly, an expansion valve 4, a liquid reservoir 7, a refrigerant pump 8, a liquid separator 9, a battery cluster 10 and a valve member. The condenser assembly includes a first condenser 3 and a condensing fan 17, and the condensing fan 17 is located on one side of the first condenser 3. Among them, the refrigerant outlet of the compressor 1 is connected to the first port of the first condenser 3, the two ends of the expansion valve 4 are respectively connected to the second port of the first condenser 3 and the refrigerant inlet of the liquid reservoir 7, the two ends of the refrigerant pump 8 are respectively connected to the first refrigerant outlet of the liquid reservoir 7 and the refrigerant inlet of the liquid separator 9, the two ends of the battery cluster 10 are respectively connected to the refrigerant outlet of the liquid separator 9 and the refrigerant inlet of the liquid reservoir 7, the refrigerant second outlet of the liquid reservoir 7 is connected to the refrigerant inlet of the compressor 1, and the valve member is located between the refrigerant inlet of the compressor 1 and the refrigerant second outlet of the liquid reservoir 7.

[0043] It should be noted that the liquid accumulator 7 is placed vertically, the first refrigerant outlet of the liquid accumulator 7 is located at the bottom of the liquid accumulator 7 , and the second refrigerant outlet is located at the top of the liquid accumulator 7 .

[0044] The first port of the first condenser 3 is a port close to the compressor 1 , and the second port of the first condenser 3 is a port away from the compressor 1 .

[0045] Based on the above design, the condenser assembly includes a first condenser 3 and a condenser fan 17. The condenser fan 17 is located on one side of the first condenser 3 to increase the heat exchange efficiency of the first condenser 3. On the one hand, when the battery in the battery cluster 10 needs to be cooled, such as Figure 2As shown, the compressor 1 is started, and the compressor 1 can compress the sucked low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant for discharge; the high-temperature and high-pressure gaseous refrigerant enters the first condenser 3, dissipates heat in the first condenser 3 and becomes medium-temperature and high-pressure liquid refrigerant; then the medium-temperature and high-pressure liquid refrigerant is throttled and depressurized by the expansion valve 4 to form a low-temperature and low-pressure gas-liquid two-phase refrigerant; after the gas-liquid two-phase refrigerant enters the liquid accumulator 7, the liquid refrigerant enters the liquid distributor 9 driven by the refrigerant pump 8, and the liquid distributor 9 distributes the liquid refrigerant to each battery cold plate in the battery cluster 10, outputs the cooling capacity of the system, absorbs the heat generated by the batteries in the battery cluster 10, and the evaporated or partially evaporated refrigerant merges with the gas-liquid two-phase refrigerant after the expansion valve 4, and enters the liquid accumulator 7 together, wherein the gaseous refrigerant is discharged from the top of the liquid accumulator 7 and returns to the suction side of the compressor 1 through the valve member, completing the cooling process of the batteries in the battery cluster 10. First, the refrigerant second outlet of the liquid reservoir 7 is set at the top of the liquid reservoir 7, and the refrigerant outlet of the battery cluster 10 is connected to the refrigerant inlet of the liquid reservoir 7, so that the evaporated refrigerant passes through the liquid reservoir 7 again, leaving the liquid refrigerant that may be carried in the liquid reservoir 7, and then uses the characteristics of the gaseous refrigerant to make the gaseous refrigerant enter the suction side of the compressor 1 from the refrigerant second outlet of the liquid reservoir 7, so as to avoid liquid refrigerant entering the suction side of the compressor 1 and causing liquid hammer. Secondly, the energy storage direct cooling system also pumps refrigerant to the battery cluster 10 through the refrigerant pump 8, which can fully supply liquid to the battery cluster 10 without worrying about liquid inhalation by the compressor 1 and causing liquid hammer. On the other hand, when the temperature of the batteries in the battery cluster 10 is uneven after cooling, such as Figure 3 As shown, the compressor 1 stops running, and the expansion valve 4 and valve components are closed to prevent the refrigerant from entering the compressor 1 and the first condenser 3. The liquid refrigerant enters the liquid distributor 9 through the drive of the refrigerant pump 8, and the liquid refrigerant is then distributed to each battery cold plate in the battery cluster 10 through the liquid distributor 9. If the temperature of some batteries in the battery cluster 10 is higher than the saturation temperature of the refrigerant at this time and pressure, the refrigerant evaporates and absorbs heat to cool the battery; if the temperature of other batteries in the battery cluster 10 is lower than the saturation temperature of the refrigerant at this time and pressure, the refrigerant releases heat (releases latent heat or sensible heat) to warm the battery, that is, the refrigerant partially evaporates or partially maintains liquid state and is discharged from the battery cluster 10 and then merged into the liquid storage 7, realizing the self-circulation of the refrigerant in the system, solving the problem of poor temperature consistency of the batteries in the battery cluster 10 after cooling in the prior art. On the other hand, the energy storage direct cooling system integrates the refrigeration mode and the self-circulation mode, and has a high degree of integration.

[0046] Furthermore, the energy storage direct cooling system further includes a heater 14, which is disposed in the refrigerant cycle driven by the refrigerant pump 8 and is used to heat the refrigerant. Optionally, the heater 14 is located inside the liquid reservoir 7, so that the energy storage direct cooling system can achieve a heating mode to meet the heating requirements of the batteries in the battery cluster 10. Figure 4 As shown, when the energy storage direct cooling system is operating in heating mode, the valve member and the expansion valve 4 are closed to prevent the refrigerant from passing through, and the compressor 1 and the first condenser 3 are stopped, and the liquid refrigerant is heated in the liquid reservoir 7, wherein a part of the liquid refrigerant evaporates, thereby increasing the internal pressure of the system components in the heating cycle, and the other part of the liquid refrigerant enters the liquid separator 9 through the drive of the refrigerant pump 8, and the liquid refrigerant is distributed by the liquid separator 9 to each battery cold plate in the battery cluster 10, and the refrigerant outputs heat to heat the batteries in the battery cluster 10; the cooled liquid refrigerant returns to the liquid reservoir 7, completing the cycle.

[0047] Of course, the heater 14 can also be installed on the pipeline from the liquid reservoir 7 to the refrigerant pump 8 or on the pipeline from the refrigerant pump 8 to the liquid distributor 9, or on the pipeline from the battery cluster 10 back to the liquid reservoir 7. The present invention is not limited to this. As long as the refrigerant in the circuit can be heated, it can be set according to needs.

[0048] It should be noted that when the energy storage direct cooling system operates in the refrigeration mode and the self-circulation mode, the heater 14 can be turned off. The refrigeration principle and the self-circulation principle are the same as those when the heater 14 is not set, and will not be repeated here.

[0049] To apply to oil-containing compressor 1, continue as Figure 1 As shown, the energy storage direct cooling system also includes an oil separator 2 and a solenoid valve 6. The refrigerant inlet and outlet of the oil separator 2 are respectively connected to the compressor 1 and the first condenser 3. The oil outlet of the oil separator 2 is connected to the refrigerant inlet of the compressor 1. The oil outlet of the oil separator 2 is located at the bottom of the oil separator 2. The two ends of the solenoid valve 6 are respectively connected to the third refrigerant outlet and valve member of the liquid reservoir 7. The third refrigerant outlet of the liquid reservoir 7 is located at the bottom of the liquid reservoir 7. The compressor 1 can return oil in two ways to ensure sufficient lubricating oil. The first way is that the compressor 1 discharges the high-temperature and high-pressure oil-containing gaseous refrigerant. After the refrigerant passes through the oil separator 2, most of the lubricating oil returns to the suction side of the compressor 1 (i.e., the refrigerant inlet of the compressor 1) through the oil outlet at the bottom of the oil separator 2 and is brought back together with the return air; the second way is that the solenoid valve 6 is opened when the compressor 1 is running, and the oil-containing liquid refrigerant at the bottom of the liquid reservoir 7 is brought back to the suction side of the compressor 1 by the return air.

[0050] In this embodiment, the valve component includes a two-way valve 5, one end of the two-way valve 5 is respectively connected to the refrigerant second outlet of the liquid storage tank 7 and the solenoid valve 6, and the other end of the two-way valve 5 is respectively connected to the refrigerant inlet of the compressor 1 and the oil outlet of the oil separator 2. The two-way valve 5 has a small number of interfaces and a simple connection.

[0051] Optionally, the two-way valve 5 is an electric ball valve.

[0052] Embodiment 2

[0053] The similarities between this embodiment and the first embodiment are not described in detail. Only the differences between this embodiment and the first embodiment are described below:

[0054] like Figure 5 As shown, in this embodiment, the valve member includes a first three-way valve 12, and the energy storage direct cooling system also includes a second three-way valve 11. The a-th interface of the first three-way valve 12 is connected to the refrigerant outlet of the oil separator 2 and the first port of the first condenser 3, respectively. The b-th interface of the first three-way valve 12 is connected to the refrigerant inlet of the compressor 1 and the solenoid valve 6. The c-th interface of the first three-way valve 12 is connected to the refrigerant second outlet of the accumulator 7. The a-th interface of the second three-way valve 11 is connected to the refrigerant inlet of the accumulator 7 and the refrigerant outlet of the expansion valve 4, respectively. The b-th interface of the second three-way valve 11 is connected to the second port of the first condenser 3 and the refrigerant inlet of the expansion valve 4, respectively. The c-th interface of the second three-way valve 11 is connected to the refrigerant outlet of the battery cluster 10. Through the selective communication of each interface of the first three-way valve 12 and the selective communication of each interface of the second three-way valve 11, the energy storage direct cooling system can not only realize the cooling mode, self-circulation mode and heating mode in the first embodiment, but also realize the natural cooling mode of the system.

[0055] Specifically, Figure 6 As shown, when the energy storage direct cooling system operates in the refrigeration mode, in the first three-way valve 12, only the b-th interface of the first three-way valve 12 and the c-th interface of the first three-way valve 12 are connected; in the second three-way valve 11, only the a-th interface of the second three-way valve 11 and the c-th interface of the second three-way valve 11 are connected. The specific refrigeration principle is the same as that in Example 1 and will not be repeated here.

[0056] like Figure 7 As shown, in the self-circulation mode of the energy storage direct cooling system, the solenoid valve 6, the expansion valve 4 and the first three-way valve 12 are all closed; in the second three-way valve 11, only the ath interface of the second three-way valve 11 and the cth interface of the second three-way valve 11 are connected. The specific self-circulation principle is the same as that in Example 1 and will not be repeated here.

[0057] like Figure 8 As shown, when the energy storage direct cooling system operates in heating mode, the solenoid valve 6, the expansion valve 4 and the first three-way valve 12 are all closed; in the second three-way valve 11, only the ath interface of the second three-way valve 11 and the cth interface of the second three-way valve 11 are connected. The specific heating principle is the same as that in Example 1 and will not be repeated here.

[0058] like Fig. 9As shown, when the energy storage direct cooling system operates in natural cooling mode, the compressor 1 stops running, the expansion valve 4 and the solenoid valve 6 are closed, and in the first three-way valve 12, only the a-th interface of the first three-way valve 12 is connected to the c-th interface of the first three-way valve 12, and in the second three-way valve 11, only the b-th interface of the second three-way valve 11 is connected to the c-th interface of the second three-way valve 11. The liquid refrigerant in the liquid reservoir 7 enters the liquid distributor 9 through the drive of the refrigerant pump 8, and the liquid refrigerant is distributed to each battery cold plate in the battery cluster 10 by the liquid distributor 9, outputs the cooling capacity of the system, and absorbs the heat generated by each battery in the battery cluster 10; after the refrigerant evaporates or partially evaporates, it enters the first condenser 3 through the second three-way valve 11, and the refrigerant dissipates heat and condenses into liquid refrigerant in the first condenser 3, and the liquid refrigerant returns to the liquid reservoir 7 through the first three-way valve 12 to complete the cycle.

[0059] It should be noted that the energy storage direct cooling system further includes a one-way valve 13, the refrigerant inlet of the one-way valve 13 is connected to the refrigerant outlet of the oil separator 2, and the refrigerant outlet of the one-way valve 13 is respectively connected to the first port of the first condenser 3 and the first interface a of the first three-way valve 12. Therefore, in the above-mentioned natural cooling mode, the refrigerant cannot enter the oil separator 2.

[0060] Embodiment 3

[0061] The similarities between this embodiment and the first embodiment are not described in detail. Only the differences between this embodiment and the first embodiment are described below:

[0062] like Fig.10 As shown, the valve member includes a two-way valve 5, one end of the two-way valve 5 is respectively connected to the refrigerant second outlet of the liquid reservoir 7 and the solenoid valve 6, and the other end of the two-way valve 5 is respectively connected to the refrigerant inlet of the compressor 1 and the oil outlet of the oil separator 2. The energy storage direct cooling system also includes a third three-way valve 16, and the condenser assembly also includes a second condenser 15. The a-th interface of the third three-way valve 16 is connected to the second port of the second condenser 15, and the b-th interface of the third three-way valve 16 is respectively connected to the first port of the second condenser 15, the refrigerant inlet of the liquid reservoir 7 and the refrigerant outlet of the expansion valve 4. Through the selective connection of the various interfaces of the third three-way valve 16, the energy storage direct cooling system can not only realize the refrigeration mode, self-circulation mode and heating mode in Example 1, but also realize the system natural cooling mode and combined refrigeration mode.

[0063] It should be noted that, in this embodiment, the second condenser 15 is placed in parallel with the first condenser 3 , and the first port of the second condenser 15 is a port close to the compressor 1 , and the second port of the second condenser 15 is a port away from the compressor 1 .

[0064] Specifically, Fig.11As shown, when the energy storage direct cooling system operates in refrigeration mode, the second condensation is not started, and in the third three-way valve 16, only the b-th interface of the third three-way valve 16 and the c-th interface of the third three-way valve 16 are connected. The specific refrigeration principle is the same as that in Example 1 and will not be repeated here.

[0065] like Fig.12 As shown, when the energy storage direct cooling system operates in the self-circulation mode, the solenoid valve 6, the expansion valve 4 and the two-way valve 5 are all closed, the compressor 1 and the first condenser 3 stop running, and the second condenser 15 is not started; in the third three-way valve 16, only the b-th interface of the third three-way valve 16 and the c-th interface of the third three-way valve 16 are connected. The specific self-circulation principle is the same as that of Example 1, and will not be repeated here.

[0066] like Fig.13 As shown, when the energy storage direct cooling system operates in heating mode, the solenoid valve 6, the expansion valve 4 and the two-way valve 5 are all closed; the compressor 1 and the first condenser 3 stop running, and the second condenser 15 is not started; in the third three-way valve 16, only the b-th interface of the third three-way valve 16 and the c-th interface of the third three-way valve 16 are connected. The specific heating principle is the same as that in Example 1 and will not be repeated here.

[0067] like Fig.14 As shown, in the natural cooling mode of the energy storage direct cooling system, the compressor 1 and the first condenser 3 are stopped, the expansion valve 4, the solenoid valve 6 and the two-way valve 5 are closed, and in the third three-way valve 16, only the a-th interface of the third three-way valve 16 and the c-th interface of the third three-way valve 16 are connected. The liquid refrigerant in the liquid reservoir 7 enters the liquid distributor 9 through the drive of the refrigerant pump 8, and the liquid refrigerant is distributed to each battery cold plate in the battery cluster 10 by the liquid distributor 9, outputs the cooling capacity of the system, and absorbs the heat generated by each battery in the battery cluster 10; after the refrigerant evaporates or partially evaporates, it enters the second condenser 15 through the third three-way valve 16, and the refrigerant dissipates heat in the second condenser 15 and condenses into liquid refrigerant, and the liquid refrigerant returns to the liquid reservoir 7 to complete the cycle.

[0068] like Fig.15 As shown, when the energy storage direct cooling system operates in the combined refrigeration mode, the ath interface of the third three-way valve 16, the bth interface of the third three-way valve 16 and the cth interface of the third three-way valve 16 are interconnected, and the energy storage direct cooling system can operate in the refrigeration mode and the natural cooling mode at the same time. The first condenser 3 is used in the refrigeration mode, and the second condenser 15 is used in the natural cooling mode. The specific principles are the same as those in the second embodiment and will not be repeated here.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Energy storage direct cooling system, characterized in that: The invention comprises a compressor (1), a condenser assembly, an expansion valve (4), a liquid storage device (7), a refrigerant pump (8), a liquid distributor (9), a battery cluster (10) and a valve member, wherein the condenser assembly comprises a first condenser (3) and a condensing fan (17), wherein the condensing fan (17) is located on one side of the first condenser (3), wherein: The refrigerant outlet of the compressor (1) is connected to the first port of the first condenser (3), the two ends of the expansion valve (4) are respectively connected to the second port of the first condenser (3) and the refrigerant inlet of the liquid accumulator (7), the two ends of the refrigerant pump (8) are respectively connected to the first refrigerant outlet of the liquid accumulator (7) and the refrigerant inlet of the liquid distributor (9), the two ends of the battery cluster (10) are respectively connected to the refrigerant outlet of the liquid distributor (9) and the refrigerant inlet of the liquid accumulator (7), the second refrigerant outlet of the liquid accumulator (7) is connected to the refrigerant inlet of the compressor (1), and the valve member is located between the refrigerant inlet of the compressor (1) and the second refrigerant outlet of the liquid accumulator (7).

2. The energy storage direct cooling system according to claim 1, characterized in that: The energy storage direct cooling system further comprises a heater (14), wherein the heater (14) is arranged in a refrigerant cycle driven by the refrigerant pump (8).

3. The energy storage direct cooling system according to claim 2, characterized in that: The energy storage direct cooling system also includes an oil separator (2) and a solenoid valve (6); the refrigerant inlet and outlet of the oil separator (2) are respectively connected to the compressor (1) and the first condenser (3); the oil outlet of the oil separator (2) is connected to the refrigerant inlet of the compressor (1); the oil outlet of the oil separator (2) is located at the bottom of the oil separator (2); the two ends of the solenoid valve (6) are respectively connected to the third refrigerant outlet of the liquid reservoir (7) and the valve member; the third refrigerant outlet of the liquid reservoir (7) is located at the bottom of the liquid reservoir (7).

4. The energy storage direct cooling system according to claim 3, characterized in that: The valve member comprises a two-way valve (5), one end of which is respectively connected to the refrigerant second outlet of the liquid accumulator (7) and the solenoid valve (6), and the other end of which is respectively connected to the refrigerant inlet of the compressor (1) and the oil outlet of the oil separator (2).

5. The energy storage direct cooling system according to claim 3, characterized in that: The valve component comprises a first three-way valve (12), and the energy storage direct cooling system further comprises a second three-way valve (11); the a-th interface of the first three-way valve (12) is respectively connected to the refrigerant outlet of the oil separator (2) and the first port of the first condenser (3); the b-th interface of the first three-way valve (12) is respectively connected to the refrigerant inlet of the compressor (1) and the solenoid valve (6); the c-th interface of the first three-way valve (12) is connected to the refrigerant second outlet of the liquid accumulator (7); the a-th interface of the second three-way valve (11) is respectively connected to the refrigerant inlet of the liquid accumulator (7) and the refrigerant outlet of the expansion valve (4); the b-th interface of the second three-way valve (11) is respectively connected to the second port of the first condenser (3) and the refrigerant inlet of the expansion valve (4); and the c-th interface of the second three-way valve (11) is connected to the refrigerant outlet of the battery cluster (10).

6. The energy storage direct cooling system according to claim 5, characterized in that: The expansion valve (4) and the solenoid valve (6) are both closed; in the first three-way valve (12), only the ath interface of the first three-way valve (12) and the cth interface of the first three-way valve (12) are in communication; and in the second three-way valve (11), only the bth interface of the second three-way valve (11) and the cth interface of the second three-way valve (11) are in communication.

7. The energy storage direct cooling system according to claim 3, characterized in that: The valve component comprises a two-way valve (5), one end of which is respectively connected to the second refrigerant outlet of the liquid accumulator (7) and the solenoid valve (6), and the other end of which is respectively connected to the refrigerant inlet of the compressor (1) and the oil outlet of the oil separator (2); the energy storage direct cooling system also comprises a third three-way valve (16), and the condenser assembly also comprises a second condenser (15), the a-th interface of the third three-way valve (16) is connected to the second port of the second condenser (15), and the b-th interface of the third three-way valve (16) is respectively connected to the first port of the second condenser (15), the refrigerant inlet of the liquid accumulator (7) and the refrigerant outlet of the expansion valve (4).

8. The energy storage direct cooling system according to claim 7, characterized in that: The expansion valve (4), the solenoid valve (6) and the two-way valve (5) are all closed, and in the third three-way valve (16), only the ath interface of the third three-way valve (16) and the cth interface of the third three-way valve (16) are connected.

9. The energy storage direct cooling system according to claim 7, characterized in that: The a-th interface of the third three-way valve (16), the b-th interface of the third three-way valve (16) and the c-th interface of the third three-way valve (16) are interconnected.

10. The energy storage direct cooling system according to any one of claim 4 or claim 7, characterized in that: The two-way valve (5) is an electric ball valve.

Images