Refrigerating system for energy storage cabinet

Abstract

The utility model relates to a refrigerating system for an energy storage cabinet in the field of refrigerating systems, which comprises a compressor, a condenser, an electronic expansion valve, a battery pack evaporator and a controller, refrigerant is added in the compressor, and the refrigerant can sequentially pass through the condenser, the electronic expansion valve and the battery pack evaporator through a refrigerating pipeline and then returns to the compressor. An environment refrigeration evaporator, an environment refrigeration electromagnetic valve and a battery pack refrigeration electromagnetic valve are arranged between the compressor and the battery pack evaporator, the battery pack refrigeration electromagnetic valve is connected with the environment refrigeration evaporator in parallel, and the environment refrigeration electromagnetic valve is arranged at the end, close to the battery pack evaporator, of the environment refrigeration evaporator. The environment refrigeration electromagnetic valve, the battery pack refrigeration electromagnetic valve and the electronic expansion valve are all electrically connected with the controller, a refrigerant can refrigerate and dehumidify the environment space of the energy storage system after entering the environment refrigeration evaporator, the refrigerant can be further gasified in the environment refrigeration evaporator, the refrigerant is prevented from returning to the compressor in a liquid state, and the energy storage system is protected. And the liquid return phenomenon is avoided.

Description

Technical Field

[0001] The utility model relates to the field of refrigeration systems, in particular to a refrigeration system for an energy storage cabinet. Background Art

[0002] Refrigeration in an energy storage system is a key link to ensure the efficient and stable operation of energy storage devices. Energy storage systems, such as battery energy storage systems, generate a large amount of heat during operation. If this heat cannot be dissipated in time, it will cause the temperature of the energy storage device to rise, thereby affecting its performance and lifespan.

[0003] A refrigeration system generally includes a main circulation pump group, a heat exchanger, a control and protection system, and pipelines. The main circulation pump group includes a main water pump, a voltage stabilizing circuit, and pipelines, which are responsible for the circulating transportation of the cooling medium. The heat exchanger is generally an air cooler, a cooling tower, a chiller, an evaporator, etc., which is used for heat exchange between the cooling medium and air or water to reduce the temperature. The pipelines are used to connect each component to form a closed circulation loop. The control and protection system is used to monitor and control the operating state of the refrigeration system to ensure the safe and stable operation of the system.

[0004] With the continuous growth of energy demand and the wide application of renewable energy, the application scope of energy storage products is becoming wider and wider. A fully immersed liquid-cooled energy storage system requires two sets of refrigeration systems, one for the battery cells and one for environmental refrigeration. The traditional liquid-cooled energy storage refrigeration system cannot meet the normal use of energy storage products alone with one set, and the cost of installing two sets of refrigeration systems is too high, and the phenomenon of liquid backflow is likely to occur. The liquid backflow phenomenon refers to the existence of liquid refrigerant at the suction port of the compressor in a refrigeration system with a refrigerant compression cycle, resulting in the liquid refrigerant being sucked into the compressor. The liquid backflow phenomenon has serious harm to the refrigeration system, especially the compressor. After the liquid refrigerant enters the compressor, liquid compression will occur, which will not only generate a huge impact force, but also be accompanied by impact sounds and violent vibrations, which may cause damage to the compressor. Summary of the Utility Model

[0005] In order to overcome the deficiencies of the prior art solutions, the utility model provides a refrigeration system for an energy storage cabinet, which can effectively solve the technical problems of too high cost of two sets of refrigeration systems and easy occurrence of liquid backflow phenomenon.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A refrigeration system for an energy storage cabinet, comprising a compressor, a condenser, an electronic expansion valve, a battery pack evaporator and a controller. The compressor, the condenser, the electronic expansion valve and the battery pack evaporator are sequentially connected through a refrigeration pipeline. The compressor, the condenser, the electronic expansion valve and the controller can be installed inside the energy storage cabinet, and the battery pack evaporator can be installed inside the battery pack. A refrigerant is added to the compressor, and the refrigerant can pass through the condenser, the electronic expansion valve and the battery pack evaporator in sequence through the refrigeration pipeline and then return to the compressor. An ambient refrigeration evaporator, an ambient refrigeration solenoid valve and a battery pack refrigeration solenoid valve are arranged between the compressor and the battery pack evaporator. The battery pack refrigeration solenoid valve is connected in parallel with the ambient refrigeration evaporator. The ambient refrigeration solenoid valve is arranged at one end of the ambient refrigeration evaporator close to the battery pack evaporator. The ambient refrigeration solenoid valve, the battery pack refrigeration solenoid valve and the electronic expansion valve are all electrically connected to the controller.

[0008] Further, there are two or more battery pack evaporators, and the two or more battery pack evaporators are connected in parallel with each other. A liquid distributor is connected to one end of the electronic expansion valve close to the battery pack evaporator, and the two or more battery pack evaporators are all connected to the liquid distributor.

[0009] Further, an oil separator is connected to one end of the compressor close to the condenser. One end of the oil separator close to the condenser is connected to the compressor through an oil return pipe, and the refrigerant flows into the condenser after passing through the oil separator.

[0010] Further, an exhaust pressure sensor and a temperature sensing probe are arranged at one end of the compressor close to the ambient refrigeration evaporator and at one end of the oil separator close to the condenser. An exhaust pressure switch is also arranged at one end of the oil separator close to the condenser. The exhaust pressure switch, the exhaust pressure sensor and the temperature sensing probe are all electrically connected to the controller.

[0011] Further, a one-way flow valve for preventing refrigerant backflow is connected to one end of the battery pack refrigeration solenoid valve close to the compressor.

[0012] Further, a filter for filtering impurities in the refrigerant is arranged at one end of the condenser close to the electronic expansion valve.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: An environmental cooling evaporator, an environmental cooling solenoid valve, and a battery pack cooling solenoid valve are provided. The battery pack cooling solenoid valve is connected in parallel with the environmental cooling evaporator. After the refrigerant flows out of the battery pack evaporator, it can directly return to the compressor or enter the environmental cooling evaporator. After the refrigerant enters the environmental cooling evaporator, it can cool and dehumidify the environmental space of the energy storage system, improve the refrigeration efficiency, reduce the energy consumption of the system, reduce the overall cost of the energy storage system, and enhance the economic benefits. At the same time, when the refrigerant is not completely evaporated and gasified in the battery pack evaporator, the refrigerant can further absorb heat and evaporate and gasify in the environmental cooling evaporator, preventing the refrigerant from returning to the compressor in a liquid state, avoiding the occurrence of liquid return phenomenon, reducing the probability of faults, and improving the stability and reliability of the system. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of only battery cooling in the present utility model;

[0015] Figure 2 It is a schematic diagram of simultaneously cooling the battery and the environment in the present utility model;

[0016] Reference numerals in the figure: 1 - compressor, 2 - condenser, 3 - electronic expansion valve, 4 - battery pack evaporator, 5 - controller, 6 - refrigeration pipeline, 7 - environmental cooling evaporator, 8 - environmental cooling solenoid valve, 9 - battery pack cooling solenoid valve, 10 - liquid distributor, 11 - one-way flow valve, 12 - filter, 13 - oil separator, 14 - exhaust pressure switch, 15 - temperature sensing probe, 16 - exhaust pressure sensor. Detailed Embodiment

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0018] Next, in conjunction with Figure 1 - Figure 2 A refrigeration system for an energy storage cabinet of the present utility model will be described in detail:

[0019] A refrigeration system for an energy storage cabinet, comprising a compressor 1, a condenser 2, an electronic expansion valve 3, a battery pack evaporator 4 and a controller 5. The compressor 1, the condenser 2, the electronic expansion valve 3 and the battery pack evaporator 4 are sequentially connected through a refrigeration pipeline 6. The compressor 1, the condenser 2, the electronic expansion valve 3 and the controller 5 can be installed inside the energy storage cabinet, and the battery pack evaporator 4 can be installed inside the battery pack. A refrigerant is added to the compressor 1, and the refrigerant can pass through the refrigeration pipeline 6 and sequentially pass through the condenser 2, the electronic expansion valve 3 and the battery pack evaporator 4 and then return to the compressor 1. An ambient refrigeration evaporator 7, an ambient refrigeration solenoid valve 8 and a battery pack refrigeration solenoid valve 9 are arranged between the compressor 1 and the battery pack evaporator 4. The battery pack refrigeration solenoid valve 9 is in parallel with the ambient refrigeration evaporator 7. The ambient refrigeration solenoid valve 8 is arranged at one end of the ambient refrigeration evaporator 7 close to the battery pack evaporator 4. The ambient refrigeration solenoid valve 8, the battery pack refrigeration solenoid valve 9 and the electronic expansion valve 3 are all electrically connected to the controller 5.

[0020] There are two battery pack evaporators 4, and the two battery pack evaporators 4 are in parallel with each other. A liquid distributor 10 is connected to one end of the electronic expansion valve 3 close to the battery pack evaporator 4, and both battery pack evaporators 4 are connected to the liquid distributor 10. One end of the battery pack refrigeration solenoid valve 9 close to the compressor 1 is connected with a one-way flow valve 11 to prevent the refrigerant from flowing back to the battery pack evaporator 4 after leaving the ambient refrigeration evaporator 7. A filter 12 is arranged at one end of the condenser 2 close to the electronic expansion valve 3. The filter 12 can effectively remove solid impurities in the refrigeration pipeline 6, such as water vapor, dust entering during production or maintenance, and solid particles brought in when filling the refrigerant, protecting key components such as the expansion valve and the compressor 1 from corrosion and blockage, thereby extending the service life of these components and improving the overall performance of the system.

[0021] One end of the compressor 1 close to the condenser 2 is connected to an oil separator 13. One end of the oil separator 13 close to the condenser 2 is connected to the compressor 1 through an oil return pipe. The refrigerant flows into the condenser 2 after passing through the oil separator 13, preventing the lubricating oil of the compressor 1 from entering the refrigeration pipeline 6. Exhaust pressure sensors 16 and temperature sensors 15 are provided at one end of the compressor 1 close to the environmental refrigeration evaporator 7 and at one end of the oil separator 13 close to the condenser 2. An exhaust pressure switch 14 is further provided at one end of the oil separator 13 close to the condenser 2. The exhaust pressure switch 14, the exhaust pressure sensors 16 and the temperature sensors 15 are all electrically connected to the controller 5. The exhaust pressure sensors 16 can monitor the pressure of the refrigerant in the refrigeration pipeline 6 of the refrigeration system in real time to ensure that the system operates within the set pressure range. When the exhaust pressure sensors 16 detect a pressure change, they convert this change into a circuit change signal and send it to the controller 5. The controller 5 judges whether the exhaust pressure switch 14 is working according to the electrical signal. When the pressure in the refrigeration pipeline 6 exceeds the set range, the exhaust pressure switch 14 will immediately respond and cut off the circuit to protect the safety performance of the refrigeration system, prevent damage due to overpressure or underpressure, and ensure the stable operation of the system.

[0022] The working process of a refrigeration system for an energy storage cabinet in this embodiment: After being compressed by the compressor 1, the refrigerant passes through the oil separator 13. The lubricating oil of the compressor 1 returns to the compressor 1 after passing through the oil separator 13. The refrigerant enters the condenser 2. After the high-temperature and high-pressure gaseous refrigerant is cooled by heat dissipation in the condenser 2, it becomes a medium-temperature and medium-pressure liquid refrigerant, and then passes through the filter 12. After being filtered, it enters the electronic expansion valve 3. After passing through the electronic expansion valve 3, the refrigerant becomes a low-pressure gas-liquid mixture state, and then passes through the diverter to be evenly distributed to the battery pack evaporators 4 inside each battery pack. After passing through the battery pack evaporators 4, the refrigerant becomes a low-pressure gas state. The environmental refrigeration solenoid valve 8 is closed, and the battery pack refrigeration solenoid valve 9 is opened. The low-pressure gas refrigerant returns to the compressor 1 through the battery pack refrigeration solenoid valve 9 and the one-way flow valve 11 to enter the next cycle.

[0023] When environmental refrigeration is required and the phenomenon of liquid return needs to be handled: After being compressed by the compressor 1, the refrigerant passes through the oil separator 13. The lubricating oil of the compressor 1 returns to the compressor 1 after passing through the oil separator 13. The refrigerant enters the condenser 2. After the high-temperature and high-pressure gaseous refrigerant is cooled by heat dissipation in the condenser 2, it becomes a medium-temperature and medium-pressure liquid refrigerant. Then it passes through the filter 12 and enters the electronic expansion valve 3 after filtration. After passing through the electronic expansion valve 3, the refrigerant becomes a low-pressure liquid state. Then it passes through the shunt and is evenly distributed to the battery pack evaporators 4 inside each battery pack. After passing through the battery pack evaporators 4, the refrigerant becomes a low-pressure gas state. The environmental refrigeration solenoid valve 8 is opened and the battery pack refrigeration solenoid valve 9 is closed. The low-pressure gas refrigerant enters the environmental refrigeration evaporator 7, and the refrigerant further evaporates and gasifies, absorbing heat, achieving refrigeration and dehumidification of the space inside the energy storage system warehouse, and also synchronously achieving complete evaporation and gasification of the refrigerant, eliminating the liquid return phenomenon. After all the refrigerant is evaporated and gasified, it returns to the compressor 1 and enters the next cycle.

[0024] After the refrigerant enters the environmental refrigeration evaporator 7, it can refrigerate and dehumidify the environmental space of the energy storage system, improve the refrigeration efficiency, reduce the energy consumption of the system, reduce the overall cost of the energy storage system, and enhance the economic benefits. At the same time, when the refrigerant does not completely evaporate and gasify in the battery pack evaporator 4, the refrigerant can further absorb heat and evaporate and gasify in the environmental refrigeration evaporator 7, preventing the refrigerant from returning to the compressor 1 in a liquid state, avoiding the occurrence of the liquid return phenomenon, reducing the probability of failure, and improving the stability and reliability of the system.

[0025] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A refrigeration system for an energy storage cabinet, comprising a compressor, a condenser, an electronic expansion valve, a battery pack evaporator and a controller. The compressor, the condenser, the electronic expansion valve and the battery pack evaporator are sequentially connected through a refrigeration pipeline. The compressor, the condenser, the electronic expansion valve and the controller can be installed inside the energy storage cabinet, and the battery pack evaporator can be installed inside the battery pack. Refrigerant is added to the compressor, and the refrigerant can pass through the condenser, the electronic expansion valve and the battery pack evaporator in sequence through the refrigeration pipeline and then return to the compressor. It is characterized in that: An ambient cooling evaporator, an ambient cooling solenoid valve, and a battery pack cooling solenoid valve are provided between the compressor and the battery pack evaporator. The battery pack cooling solenoid valve is in parallel with the ambient cooling evaporator. The ambient cooling solenoid valve is arranged at one end of the ambient cooling evaporator close to the battery pack evaporator. The ambient cooling solenoid valve, the battery pack cooling solenoid valve, and the electronic expansion valve are all electrically connected to the controller.

2. The refrigeration system for an energy storage cabinet according to claim 1, characterized in that: Two or more battery pack evaporators are provided, and the two or more battery pack evaporators are connected in parallel with each other. A liquid distributor is connected to one end of the electronic expansion valve close to the battery pack evaporator, and the two or more battery pack evaporators are all connected to the liquid distributor.

3. The refrigeration system for an energy storage cabinet according to claim 1, characterized in that: An oil separator is connected to one end of the compressor close to the condenser. One end of the oil separator close to the condenser is connected to the compressor through an oil return pipe, and the refrigerant flows into the condenser after passing through the oil separator.

4. The refrigeration system for an energy storage cabinet according to claim 3, wherein: An exhaust pressure sensor and a temperature sensing probe are both arranged at one end of the compressor close to the ambient cooling evaporator and one end of the oil separator close to the condenser. An exhaust pressure switch is also arranged at one end of the oil separator close to the condenser. The exhaust pressure switch, the exhaust pressure sensor, and the temperature sensing probe are all electrically connected to the controller.

5. A refrigeration system for an energy storage cabinet according to any one of claims 1-4, characterized in that: A one-way flow valve for preventing refrigerant backflow is connected to one end of the battery pack cooling solenoid valve close to the compressor.

6. A refrigeration system for an energy storage cabinet according to any one of claims 1-4, characterized in that: A filter for filtering impurities in the refrigerant is arranged at one end of the condenser close to the electronic expansion valve.

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