Multi-mode energy storage liquid cooling system

Abstract

The utility model relates to a multi-mode energy storage liquid cooling system which comprises a cooling liquid circulation pipeline, a refrigeration heat exchange pipeline and a heating pipeline, the inlet end and the outlet end of the cooling liquid circulation pipeline are respectively connected with a battery bin, and a circulation water pump, a water inlet temperature sensor and a water outlet temperature sensor are arranged on the cooling liquid circulation pipeline. The refrigeration heat exchange pipeline comprises a compressor, a first heat exchanger, a throttling element and a second heat exchanger which are sequentially connected, a heat exchange pipe of the cooling liquid circulation pipeline is connected to the second heat exchanger in series, and the heating pipeline and the heat exchange pipe are arranged in parallel. The liquid cooling system is high in heat exchange coefficient, large in specific heat capacity, high in cooling speed and small in influence of altitude and air pressure. The liquid cooling system has multiple working modes and can operate in an energy-saving manner according to temperature changes.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid cooling of energy storage power stations, and in particular to a multi-mode energy storage liquid cooling system. Background Art

[0002] Whether developing distributed energy storage or centralized energy storage, liquid cooling equipment is required to accurately control the operating temperature of the battery, so the reasonable design of the liquid cooling equipment system is crucial. The energy storage liquid cooling system uses liquid as a cooling medium to remove the heat generated by the battery through convection heat transfer. Common media include water, ethylene glycol aqueous solution, pure ethylene glycol, air conditioning refrigerant and silicone oil. The liquid cooling system has a high heat transfer coefficient, large specific heat capacity, fast cooling speed, and the specific heat capacity of the liquid is not affected by altitude and air pressure, so it has a wide range of applications. However, the current liquid cooling system has a relatively single mode and cannot be adjusted according to actual operating conditions. Utility Model Content

[0003] The utility model aims to provide a multi-mode energy storage liquid cooling system, so as to adjust the liquid cooling mode according to different working conditions to achieve the purpose of energy saving.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A multi-mode energy storage liquid cooling system includes a coolant circulation pipeline, a refrigeration heat exchange pipeline, and a heating pipeline. The inlet end and the outlet end of the coolant circulation pipeline are respectively connected to the battery compartment. The coolant circulation pipeline is provided with a circulating water pump, an inlet water temperature sensor, and an outlet water temperature sensor. The refrigeration heat exchange pipeline includes a compressor, a first heat exchanger, a throttling device, and a second heat exchanger connected in sequence. The heat exchange tube of the coolant circulation pipeline is connected in series to the second heat exchanger, and the heating pipeline is arranged in parallel with the heat exchange tube.

[0006] Furthermore, a filter is provided on the coolant circulation pipeline.

[0007] Furthermore, the energy storage liquid cooling system also includes a water injection pipeline, one end of which is connected to the water tank, and a water injection pump and a solenoid valve are provided on the water injection pipeline, and the other end of the water injection pipeline is connected to the coolant circulation pipeline.

[0008] Furthermore, a one-way valve is provided on the water injection pipeline between the water injection pump and the coolant circulation pipeline.

[0009] Furthermore, the energy storage liquid cooling system also includes a pressurized pipeline, one end of the pressurized pipeline is connected to an expansion tank, and the other end is connected to the coolant circulation pipeline.

[0010] Furthermore, the energy storage liquid cooling system also includes a pressure relief pipeline, on which a pressure relief valve is provided, and the pressure relief pipeline is connected to the coolant circulation pipeline and the water tank.

[0011] Furthermore, a water inlet pressure sensor and a water outlet pressure sensor are respectively provided near the inlet end and the outlet end of the coolant circulation pipeline.

[0012] Furthermore, the water tank is provided with a liquid level meter and a breathing valve.

[0013] Furthermore, the refrigeration heat exchange pipeline is provided with two independently working ones.

[0014] Furthermore, the first heat exchanger is a microchannel heat exchanger, a fan is arranged at the microchannel heat exchanger, and the second heat exchanger is a plate heat exchanger.

[0015] Furthermore, the working modes of the energy storage liquid cooling system are: (1) Refrigeration mode: the refrigeration heat exchange pipeline operates normally, the compressor compresses the gaseous refrigerant into a high-temperature and high-pressure gas, and sends it to the first heat exchanger. After cooling, it becomes a medium-temperature and high-pressure liquid refrigerant, enters the throttling device for throttling and pressure reduction, and becomes a low-temperature and low-pressure gas-liquid mixture. It then passes through the second heat exchanger to absorb heat and vaporize into a gas, returns to the compressor to continue compression, and continues to circulate for refrigeration. The liquid in the coolant circulation pipeline dissipates heat through the second heat exchanger; (2) Heating mode: the heating pipeline is turned on to heat the coolant in the coolant circulation pipeline; (3) Normal mode: the refrigeration heat exchange pipeline and the heating pipeline are both stopped, the coolant circulation pipeline works, and the coolant circulates under the action of the circulating water pump to achieve the purpose of heat dissipation.

[0016] Beneficial effects of the utility model:

[0017] It adopts a liquid cooling system with high heat transfer coefficient, large specific heat capacity and fast cooling speed; it is less affected by altitude and air pressure and has a wide range of applications.

[0018] The system has multiple working modes. It can operate energy-savingly according to changes in temperature. In summer, when the temperature is too high, the refrigeration pipeline will partially operate. In spring and autumn, when the temperature is suitable, the refrigeration pipeline will be partially closed and only the circulating water pump will work, and the coolant will circulate normally. In winter, when the temperature is too low, the electric heating pipeline will be turned on to heat the coolant to the appropriate temperature, and then cooperate with the circulating pump to work. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the multi-mode energy storage liquid cooling system of the utility model;

[0020] Figure 2 It is a simplified schematic diagram of the corresponding mode 1 of the multi-mode energy storage liquid cooling system of the utility model;

[0021] Figure 3 It is a simplified schematic diagram of the corresponding mode 2 of the multi-mode energy storage liquid cooling system of the utility model;

[0022] Figure 4 It is a simplified schematic diagram of the corresponding mode three of the multi-mode energy storage liquid cooling system of the utility model.

[0023] The names corresponding to the marks in the figure are:

[0024] 1. Butterfly valve; 2. Water inlet temperature sensor; 3. Water inlet pressure sensor; 4. Drain valve; 5. Filter; 6. Circulating water pump; 7. Electric heater; 8. Check valve; 9. Solenoid valve; 10. Water injection pump; 11. Liquid level gauge; 12. Water tank; 13. Breathing valve; 14. Ball valve; 15. Pressure relief valve; 16. Water outlet pressure sensor; 17. Water outlet temperature sensor; 18. Expansion tank; 19. Battery compartment; 20. Compressor; 21. Fan; 22. First heat exchanger; 23. Electronic expansion valve; 24. Second heat exchanger. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] Example:

[0027] like Figure 1 As shown, a multi-mode energy storage liquid cooling system includes a coolant circulation pipeline, a refrigeration heat exchange pipeline, and a heating pipeline. The inlet and outlet ends of the coolant circulation pipeline are respectively connected to the battery compartment 19. The coolant circulation pipeline is provided with a circulating water pump 6, an inlet water temperature sensor 2, an outlet water temperature sensor 17, an inlet water pressure sensor 3, and an outlet water pressure sensor 16. Under the action of the circulating water pump 6, the coolant circulates to maintain the battery compartment at a suitable temperature. As for how the two ends of the coolant circulation pipeline are connected to the cold plate flow channel of the battery compartment 19, it will not be repeated.

[0028] The water inlet pressure sensor 3 and the water outlet pressure sensor 16 are located near the inlet end and the outlet end respectively.

[0029] A filter 5 is provided on the coolant circulation pipeline to filter out some impurities to prevent the cold plate flow channel of the battery compartment 19 from being blocked during long-term operation.

[0030] The coolant circulation pipeline is also provided with a butterfly valve 1 and a drain valve 4, which are used when troubleshooting equipment.

[0031] The energy storage liquid cooling system also includes a water injection pipeline, one end of which is connected to the water tank 12. The water injection pipeline is provided with a water injection pump 10, a solenoid valve 9, and a one-way valve 8. The other end of the water injection pipeline is connected to the coolant circulation pipeline. A liquid level gauge 11 is provided on the water tank 12 for observing the liquid level. A breathing valve 13 is also provided on the top of the water tank 12, and the air in the water tank 12 can be discharged. When used for the first time, water is injected into the coolant circulation pipeline using the water injection pipeline. When there is a pressure difference between the inlet and outlet water pressure sensors, the water injection is stopped, and the water injection pump 10 and the solenoid valve 9 are turned off. In this embodiment, water is used as the coolant. In other embodiments, the coolant can be liquids such as ethylene glycol aqueous solution and pure ethylene glycol. For names containing water such as "water injection pipeline" and "circulating water pump", it is applicable to other coolants.

[0032] The refrigeration heat exchange pipeline includes a compressor 20, a first heat exchanger 22, a throttling device, and a second heat exchanger 24 connected in sequence. The heat exchange tubes of the above-mentioned coolant circulation pipeline are connected in series to the second heat exchanger 24. The throttling device adopts an electronic expansion valve 23, and capillaries can also be used in other embodiments, similar to the principle of air conditioning refrigeration. The first heat exchanger 22 adopts an existing microchannel heat exchanger, and a fan 21 is configured at the first heat exchanger 22 to use the fan to better cool down. The second heat exchanger 24 adopts an existing plate heat exchanger, and the coolant is heat exchanged here to achieve the purpose of cooling.

[0033] In this embodiment, two refrigeration heat exchange pipelines are provided, which can work independently and share one second heat exchanger 24. When one of the pipelines fails or is under maintenance, the other pipeline can work normally.

[0034] The energy storage liquid cooling system is also provided with a heating pipeline, which is arranged in parallel with the above-mentioned heat exchange tube. The heating pipeline includes an electric heater 7, and the coolant is heated and heated by the electric heater 7.

[0035] The energy storage liquid cooling system also includes a pressurized pipeline, one end of which is connected to an expansion tank 18, and the other end is connected to the coolant circulation pipeline. When the pressure in the system is lower than the set value, the expansion tank 18 can automatically add water to the coolant circulation pipeline to increase the pressure to the set value, so that the system pressure is always within a reasonable range.

[0036] The energy storage liquid cooling system also includes a pressure relief pipeline, which is provided with a pressure relief valve 15, and the pressure relief pipeline is connected to the coolant circulation pipeline and the water tank 12. When the system pressure is too high, part of the water can be discharged into the water tank 12 through the pressure relief valve 15. A ball valve 14 is also provided on the pressure relief pipeline in front of the pressure relief valve 15. The ball valve 14 is normally open and can automatically relieve pressure when the system pressure is too high. The ball valve 14 can be closed in other scenarios such as maintenance.

[0037] Working principle of the utility model energy storage liquid cooling system:

[0038] The energy storage liquid cooling system has three working modes: (1) Refrigeration mode: This mode is mainly used when the temperature is high in summer. The refrigeration heat exchange pipeline operates normally. The compressor 20 compresses the gaseous refrigerant into a high-temperature and high-pressure gas and sends it to the first heat exchanger 22. After cooling, it becomes a medium-temperature and high-pressure liquid refrigerant and enters the electronic expansion valve 23 for throttling and pressure reduction. It becomes a low-temperature and low-pressure gas-liquid mixture. It then passes through the second heat exchanger 24 to absorb heat and vaporize into a gas. It returns to the compressor 20 to continue compression and continues to circulate for refrigeration. The liquid in the coolant circulation pipeline circulates to the second heat exchanger 24 for heat exchange to achieve the purpose of heat dissipation and cooling. The inlet and outlet water temperature sensors (2, 17) provide real-time feedback on the return water temperature. When the water temperature is low, the opening of the compressor 20 can be reduced. When the water temperature is high, the opening of the compressor 20 can be increased to speed up cooling. This mode corresponds to Figure 2 The simplified system schematic is shown.

[0039] (2) Heating mode: This mode is mainly used when the temperature is low in winter. The heating pipeline is turned on and the electric heater 7 heats the coolant in the coolant circulation pipeline. At this time, the refrigeration pipeline where the compressor 20 is located is stopped. This mode corresponds to Figure 3 The simplified system schematic is shown.

[0040] (3) Normal mode: This mode is mainly used when the temperature is suitable in spring and autumn. The refrigeration and heat exchange pipelines and heating pipelines are stopped, and only the coolant circulation pipeline works. The coolant circulates under the action of the circulating water pump 6 to achieve the purpose of heat dissipation. This mode corresponds to Figure 4 The simplified system schematic is shown.

[0041] The present utility model is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all those having the same or similar technical solutions as the present application fall within the protection scope of the present utility model.

Claims

1. A multi-mode energy storage liquid cooling system, characterized in that: It includes a coolant circulation pipeline, a refrigeration heat exchange pipeline, and a heating pipeline. The inlet end and the outlet end of the coolant circulation pipeline are respectively connected to the battery compartment. The coolant circulation pipeline is provided with a circulating water pump, an inlet water temperature sensor, and an outlet water temperature sensor. The refrigeration heat exchange pipeline includes a compressor, a first heat exchanger, a throttling device, and a second heat exchanger connected in sequence. The heat exchange tube of the coolant circulation pipeline is connected in series to the second heat exchanger, and the heating pipeline is arranged in parallel with the heat exchange tube.

2. The multi-mode energy storage liquid cooling system according to claim 1, characterized in that: A filter is arranged on the cooling liquid circulation pipeline.

3. The multi-mode energy storage liquid cooling system according to claim 1, characterized in that: The energy storage liquid cooling system also includes a water injection pipeline, one end of which is connected to a water tank, a water injection pump and a solenoid valve are arranged on the water injection pipeline, and the other end of the water injection pipeline is connected to the coolant circulation pipeline.

4. The multi-mode energy storage liquid cooling system according to claim 3 is characterized in that: A one-way valve is also provided on the water injection pipeline between the water injection pump and the coolant circulation pipeline.

5. The multi-mode energy storage liquid cooling system according to claim 3 is characterized in that: The energy storage liquid cooling system also includes a pressurized pipeline, one end of which is connected to an expansion tank, and the other end of which is connected to the coolant circulation pipeline.

6. The multi-mode energy storage liquid cooling system according to claim 5, characterized in that: The energy storage liquid cooling system also includes a pressure relief pipeline, on which a pressure relief valve is provided, and the pressure relief pipeline is connected to the coolant circulation pipeline and the water tank.

7. The multi-mode energy storage liquid cooling system according to claim 6, characterized in that: A water inlet pressure sensor and a water outlet pressure sensor are respectively provided near the inlet end and the outlet end of the coolant circulation pipeline.

8. The multi-mode energy storage liquid cooling system according to claim 3, characterized in that: The water tank is provided with a liquid level meter and a breathing valve.

9. The multi-mode energy storage liquid cooling system according to claim 1, characterized in that: The refrigeration heat exchange pipeline is provided with two independently working ones.

10. The multi-mode energy storage liquid cooling system according to claim 1, characterized in that: The first heat exchanger adopts a microchannel heat exchanger, and a fan is arranged at the microchannel heat exchanger. The second heat exchanger adopts a plate heat exchanger.

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