An energy-saving liquid-cooled energy storage cabinet thermal management system

Abstract

The utility model discloses an energy-saving liquid-cooled energy storage cabinet thermal management system, comprising a compressor, wherein the output end of the compressor is connected to the input end of an air-cooled condenser, the output end of the air-cooled condenser is connected to the input end of a supercooling mechanism for recooling the liquid, the output end of the supercooling mechanism is connected to the first fluid input end of a heat exchanger, the output end of the first fluid of the heat exchanger is connected to the input end of the compressor, and an expansion valve is further arranged between the first fluid input end of the heat exchanger and the input end of the supercooling mechanism. The utility model has a reasonable design structure, and can recool the condensed saturated liquid through the supercooler by adding a water-cooled supercooler and a water tank between the output end of the air-cooled condenser and the heat exchanger, so that the temperature of the condensed saturated liquid is lower than the saturation temperature under the condensation pressure, so that more refrigerant can enter the heat exchanger in a liquid state, thereby improving the refrigeration efficiency, and solving the problem that the existing single air-cooled condenser is used for condensation, which has poor effect and thus affects the heat exchange efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of battery energy storage, in particular to an energy-saving liquid-cooled energy storage cabinet thermal management system. Background Art

[0002] With the rapid development of wind power and photovoltaic industries, energy storage has largely solved the problems of randomness and volatility in renewable energy generation, playing the role of "filling the peak with the valley". The performance of energy storage depends largely on the performance of the battery. Energy storage batteries use electrochemical principles to perform charge and discharge operations. The direct conversion of chemical energy into electrical energy is the result of spontaneous oxidation, reduction and other chemical reactions inside the battery. Heat is generated during this chemical reaction. The optimal operating temperature of the battery is between 25℃ and 35℃. If the temperature is too high, the battery will experience thermal runaway. If the temperature is too low, the internal structure of the battery will be damaged or the battery performance will decrease, which will affect the number of charge and discharge cycles and the service life of the battery.

[0003] A Chinese utility model with publication number CN127035773U discloses a cabinet-type liquid cooling thermal management device for energy storage batteries. Through a refrigeration component, a heat exchanger and a cold liquid pipeline, the refrigeration component and the cold liquid pipeline are heat exchanged to maintain the liquid in the cold liquid pipeline at a suitable temperature, thereby providing a suitable temperature environment for the operation of the battery. The refrigerant in the refrigeration component is compressed into high-temperature and high-pressure steam by a compressor, enters the condenser, and is forced to be cooled by a condensing fan to form a normal-temperature high-pressure refrigerant liquid. The liquid is then reduced in pressure by an expansion valve to become a low-temperature and low-pressure liquid and enters the heat exchanger for heat exchange. However, the use of a single air-cooled condenser for condensation has a poor condensation effect due to the influence of the ambient temperature, resulting in poor heat exchange efficiency. To this end, we provide an energy-saving liquid-cooled energy storage cabinet thermal management system to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to make up for the deficiencies of the prior art and to provide an energy-saving liquid-cooled energy storage cabinet thermal management system.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An energy-saving liquid-cooled energy storage cabinet thermal management system comprises: a heat exchanger, wherein the second fluid side of the heat exchanger is sequentially connected to the energy storage cabinet heat exchange structure and the liquid supply pump through a pipeline to form a first cold liquid circulation pipeline, and the second fluid is used to perform heat exchange of the energy storage cabinet heat exchange structure; the first fluid side of the heat exchanger is sequentially connected to a compressor, an air-cooled condenser and an expansion valve through a pipeline to form a refrigeration cycle loop for cooling the liquid; the refrigeration cycle loop is also provided with a supercooling mechanism, the input end of the supercooling mechanism is connected to the output end of the air-cooled condenser, and the output end of the supercooling mechanism is connected to the heat exchanger for re-cooling the liquid;

[0007] The supercooling mechanism includes a water tank containing a second fluid, a water-cooled supercooler is installed in the water tank, a liquid supply end and a liquid outlet end of the water-cooled supercooler are both connected to the water tank, an input end of the water-cooled supercooler is connected to an output end of an air-cooled condenser, and an output end of the water-cooled supercooler is connected to a first fluid input end of a heat exchanger, so that the water-cooled supercooler serves to increase the degree of supercooling.

[0008] Furthermore, a thermal compensation pipeline is provided between the output end of the compressor and the input end of the water-cooled subcooler, and a fluorine circuit solenoid valve is installed on the thermal compensation pipeline.

[0009] Furthermore, the input end and the output end of the heat exchange structure of the energy storage cabinet are respectively connected to the water tank through pipes to form a second cold liquid circulation pipeline, and the heat exchange of the heat exchange structure of the energy storage cabinet is performed by using the second fluid;

[0010] A circulation pump is installed on the second cold liquid circulation pipeline, and the circulation pump is used to drive the second fluid in the second cold liquid circulation pipeline to flow.

[0011] Furthermore, the second cold liquid circulation pipeline also includes a pipeline loop communicating between the second fluid input end of the heat exchanger and the water tank;

[0012] The second cold liquid circulation pipeline is also provided with a control component, and the control component is used to switch the circulation circuit of the liquid inside the first cold liquid circulation pipeline and the second cold liquid circulation pipeline;

[0013] The control component is an electric valve.

[0014] Furthermore, a heater is installed in the water tank.

[0015] Furthermore, a temperature sensor is installed in the water tank; and a flow sensor is also arranged on the first cold liquid circulation pipeline.

[0016] Furthermore, the pipe in the first cold liquid circulation pipeline is connected to the input end and the output end of the heat exchange structure of the energy storage cabinet through quick-connect connectors.

[0017] Furthermore, the heat exchange structure of the energy storage cabinet is a PACK water cooling plate.

[0018] Furthermore, a drying filter is provided on the pipeline between the output end of the water-cooled subcooler and the expansion valve to dry the fluid.

[0019] Compared with the existing technology, this energy-saving liquid-cooled energy storage cabinet thermal management system has the following beneficial effects:

[0020] 1. The utility model adds a water-cooled subcooler and a water tank between the output end of the air-cooled condenser and the heat exchanger, and recools the condensed saturated liquid through the subcooler to make its temperature lower than the saturation temperature under the condensation pressure, so that more refrigerant can enter the heat exchanger in liquid state, thereby improving the refrigeration efficiency and solving the problem that the existing single air-cooled condenser has poor condensation effect and thus affects the heat exchange efficiency.

[0021] 2. The utility model adds a fluorine circuit solenoid valve between the compressor and the water-cooled subcooler, so that during charging and discharging in winter, the gaseous refrigerant directly enters the water-cooled subcooler to heat the solution in the water tank, and then stores the heat inside. After charging and discharging, it is used to heat the battery cell to maintain the temperature of the battery cell, thereby achieving the effect of recycling waste heat and saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the connection structure of the utility model.

[0023] In the figure: 1. compressor; 2. air-cooled condenser; 3. water-cooled subcooler; 4. water tank; 5. heat exchanger; 6. expansion valve; 7. liquid supply pump; 8. fluorine circuit solenoid valve; 9. circulation pump; 10. first electric valve; 11. second electric valve; 12. drying filter; 13. third electric valve; 14. fourth electric valve; 15. heater; 16. temperature sensor; 17. flow sensor; 18. heat exchange structure of energy storage cabinet. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] like Figure 1 As shown, the utility model provides a technical solution: an energy-saving liquid-cooled energy storage cabinet thermal management system, comprising: a heat exchanger 5, the second fluid side of the heat exchanger 5 is connected to the energy storage cabinet heat exchange structure 18 and the liquid supply pump 7 in sequence through a pipeline to form a first cold liquid circulation pipeline, and the second fluid is used to exchange heat of the energy storage cabinet heat exchange structure 18; the first fluid side of the heat exchanger 5 is connected to the compressor 1, the air-cooled condenser 2 and the expansion valve 6 in sequence through a pipeline to form a refrigeration cycle loop for cooling the liquid; the refrigeration cycle loop is also provided with a supercooling mechanism, the input end of the supercooling mechanism is connected to the output end of the air-cooled condenser 2, and the output end of the supercooling mechanism is connected to the heat exchanger 5 for re-cooling the liquid;

[0026] The specific connection is: the output end of the compressor 1 is connected to the input end of the air-cooled condenser 2, and the output end of the air-cooled condenser 2 is connected to the input end of the subcooling mechanism for recooling the liquid; the output end of the subcooling mechanism is connected to the first fluid input end of the heat exchanger 5, the output end of the first fluid of the heat exchanger 5 is connected to the input end of the compressor 1, and the first fluid input end of the heat exchanger 5 is also connected to the first fluid input end of the subcooling mechanism through a pipeline, and an expansion valve 6 is provided on the pipeline between the first fluid input end of the heat exchanger 5 and the first fluid input end of the subcooling mechanism;

[0027] The supercooling mechanism includes a water tank 4, in which a second fluid is contained, a water-cooled supercooler 3 is installed in the water tank 4, a liquid supply end and a liquid outlet end of the water-cooled supercooler 3 are both connected to the water tank 4, a first fluid input end of the water-cooled supercooler 3 is connected to an output end of the air-cooled condenser 2, and an output end of the water-cooled supercooler 3 is connected to a first fluid input end of a heat exchanger 5; and, a second fluid input end of the heat exchanger 5 is connected to the water tank 4 through a pipeline, and a second fluid input end and a second fluid output end of the heat exchanger 5 are respectively connected to an output end and an input end of an energy storage cabinet heat exchange structure 18 through pipelines, forming a first cold liquid circulation pipeline, and using the second fluid to perform heat exchange of the energy storage cabinet heat exchange structure 18, and a liquid supply pump 7 is provided on the first cold liquid circulation pipeline;

[0028] A fluorine adding valve and a low-pressure switch are also provided between the input end of the compressor 1 and the output end of the first fluid of the heat exchanger 5, which are used for adding refrigerant and switch control. At the same time, a high-pressure sensor is also provided at the output end of the compressor 1, which is used to detect the output air pressure state and transmit its data to the host computer. When the ambient temperature is high in summer and the internal temperature needs to be cooled, the compressor 1 provides power for the cold liquid circulation, and the refrigerant is compressed into high-temperature and high-pressure steam by the compressor 1, and then enters the air-cooled condenser 2. Through the forced cooling of the condensing fan, the refrigerant is condensed into a normal-temperature and high-pressure refrigerant liquid, and then further enters the water-cooled subcooler 3, and passes through the water-cooled subcooler 3. Recooling is carried out to make its temperature lower than the saturation temperature under the condensing pressure, so as to reduce the flash gas generated by the refrigerant liquid during the throttling process and reduce the specific volume occupied by the flash gas, so as to increase the supercooling degree of the refrigerant and thus improve the refrigeration efficiency. At the same time, the water-cooled subcooler 3 is used, and then the liquid is input into the heat exchanger 5 through the expansion valve 6, wherein the heat exchanger 5 can adopt a plate heat exchanger, and the heat exchange is completed in the heat exchanger 5, and the heat in the second fluid solution flowing through the heat exchanger 5 is absorbed, and then the cooled liquid enters the heat dissipation component again to cool the battery environment; wherein the first fluid refrigerant can be Freon, and the second fluid can be ethylene glycol aqueous solution.

[0029] A heat compensation pipeline is provided between the output end of the compressor 1 and the input end of the water-cooled supercooler 3, and a fluorine circuit solenoid valve 8 is installed on the heat compensation pipeline; when in use, when the energy storage cabinet is charged and discharged in winter, the upper computer gives a refrigeration instruction to the subcooling mechanism below, and the subcooling mechanism starts to refrigerate, and at the same time, the fluorine circuit solenoid valve 8 is opened, so that the high-temperature and high-pressure gaseous refrigerant does not pass through the air-cooled condenser 2, but enters the water-cooled supercooler 3 through the fluorine circuit battery valve loop, thereby performing heat exchange in the water tank 4, so that the high-temperature and high-pressure gaseous refrigerant is converted into a low-temperature and high-pressure liquid in the water tank 4, and at the same time, the ethylene glycol aqueous solution in the water tank 4 is heated to store heat.

[0030] The input end and the output end of the energy storage cabinet heat exchange structure 18 are respectively connected to the water tank 4 through pipes to form a second cold liquid circulation pipeline, and the second fluid is used to exchange heat in the energy storage cabinet heat exchange structure 18; a circulation pump 9 is installed on the second cold liquid circulation pipeline, and the circulation pump 9 is used to drive the flow of the second fluid in the second cold liquid circulation pipeline; a control component is also provided on the second cold liquid circulation pipeline, and the control component is used to switch the circulation circuit of the liquid inside the first cold liquid circulation pipeline and the second cold liquid circulation pipeline; the control component is an electric valve.

[0031] When in use, the number of electric valves can be four. The first electric valve 10 is located on the first cold liquid circulation pipeline between the second fluid output end of the heat exchanger 5 and the input end of the energy storage cabinet heat exchange structure 18, and is used to open and close the pipeline between the second fluid output end of the heat exchanger 5 and the input end of the energy storage cabinet heat exchange structure 18. The first electric valve 10 can be located between the liquid supply pump 7 and the circulating pump 9 and the heat dissipation component. The second electric valve 11 is located on the second cold liquid circulation pipeline, and is used to open and close the pipeline between the water tank 4 and the input end of the energy storage cabinet heat exchange structure 18. Specifically, the second electric valve 11 can be located between the circulating pump 9 and the connection position of the circulating pump 9 and the heat dissipation component; the third electric valve 13 is located on the first cold liquid circulation pipeline, and is used to open and close the pipeline at the output end of the energy storage cabinet heat exchange structure 18. Specifically, the heat dissipation component and the water tank 4 are connected through the pipeline. A third electric valve 13 is installed between the output end of the heat dissipation component and the output end of the heat dissipation component; the fourth electric valve 14 is located on the second cold liquid circulation pipeline, and is used to open and close the connecting pipe between the water tank 4 on the second cold liquid circulation pipeline and the first cold liquid circulation pipeline. The fourth electric valve 14 can be installed at the connection between the heat dissipation component and the water tank 4 and between the water tank 4; when the energy storage cabinet is charged and discharged, the upper computer of the energy storage cabinet detects that the pad core temperature is lower than the required value, the circulation pump 9 starts to work, and opens the second, third and fourth electric valves 14, and closes the first electric valve 10. Since heat is recovered during discharge, the temperature of the solution in the water tank 4 is relatively high, and then, driven by the circulation pump 9, the solution in the water tank 4 is driven to flow, and the heat is dissipated through the water cooling plate until it is heated to the required value of the charge and discharge of the battery cell, thereby achieving the effect of waste heat recycling and playing a good energy-saving role.

[0032] A heater 15 is installed in the water tank 4; in use, the expansion valve 6 and the heater 15 are connected to the corresponding lower computer to control the opening and closing of the heater 15, and the heater 15 can use a PTC heating body; when the residual heat heating is insufficient, the heater 15 is turned on for heating, so that the battery core is heated to maintain an appropriate temperature; a temperature sensor 16 is installed in the water tank 4; a flow sensor 17 is also provided on the first cold liquid circulation pipeline; when in use, the flow sensor 17 and the temperature sensor 16 are connected to the upper computer to send the collected flow and temperature information to the upper computer The machine monitors the temperature in the energy storage battery circuit, and ensures that the battery maintains an appropriate operating temperature by monitoring and controlling the flow rate and temperature; at the same time, when the temperature in the water tank 4 is higher than the set value, the upper computer sends a refrigeration instruction to the over-air-cooled condenser 2 and the over-cooling mechanism, and the air-cooled condenser 2 and the over-cooling mechanism start to work, the third electric valve 13 is closed, the first electric valve 10, the second electric valve 11, and the fourth electric valve 14 are opened, and the low-temperature liquid in the heat exchanger 5 circulates through the liquid supply pump 7 to cool the high-temperature liquid in the water tank 4 until it is cooled to the required set temperature value in the water tank 4 and then stops refrigeration.

[0033] The pipes in the first cold liquid circulation pipeline are connected to the input and output ends of the energy storage cabinet heat exchange structure 18 through quick-connect connectors; when in use, the connection method of the self-sealing quick-connect connector facilitates the maintenance and replacement of pipes or equipment.

[0034] The energy storage cabinet heat exchange structure 18 is a PACK water cooling plate, which uses the flow of coolant to effectively cool the battery pack.

[0035] A drying filter 12 is also provided on the pipeline between the output end of the water-cooled subcooler 3 and the expansion valve 6, which plays a role in drying the fluid to prevent moisture from entering the compressor 1 along with the flow of the first fluid, thereby protecting the equipment from corrosion. In use, when the refrigerant flows through the drying filter 12, the moisture is adsorbed, while the clean refrigerant continues to flow, maintaining the efficient operation of the system.

Claims

1. An energy-saving liquid-cooled energy storage cabinet thermal management system, characterized in that: include: A heat exchanger (5), wherein the second fluid side of the heat exchanger (5) is connected in sequence to the energy storage cabinet heat exchange structure (18) and the liquid supply pump (7) through a pipeline to form a first cold liquid circulation pipeline, and the second fluid is used to perform heat exchange of the energy storage cabinet heat exchange structure (18); the first fluid side of the heat exchanger (5) is connected in sequence to the compressor (1), the air-cooled condenser (2) and the expansion valve (6) through a pipeline to form a refrigeration circulation loop for cooling the liquid; the refrigeration circulation loop is also provided with a supercooling mechanism, the input end of the supercooling mechanism is connected to the output end of the air-cooled condenser (2), and the output end of the supercooling mechanism is connected to the heat exchanger (5) for re-cooling the liquid; The supercooling mechanism comprises a water tank (4) containing a second fluid, a water-cooled supercooler (3) being installed in the water tank (4), a liquid supply end and a liquid outlet end of the water-cooled supercooler (3) being connected to the water tank (4), an input end of the water-cooled supercooler (3) being connected to an output end of an air-cooled condenser (2), and an output end of the water-cooled supercooler (3) being connected to a first fluid input end of a heat exchanger (5), so that the water-cooled supercooler (3) serves to increase the degree of supercooling.

2. The energy-saving liquid-cooled energy storage cabinet thermal management system according to claim 1 is characterized in that: A thermal compensation pipeline is provided between the output end of the compressor (1) and the input end of the water-cooled subcooler (3), and a fluorine circuit solenoid valve (8) is installed on the thermal compensation pipeline.

3. The energy-saving liquid-cooled energy storage cabinet thermal management system according to claim 1 is characterized in that: The input end and the output end of the energy storage cabinet heat exchange structure (18) are respectively connected to the water tank (4) through pipelines to form a second cold liquid circulation pipeline, and the second fluid is used to perform heat exchange of the energy storage cabinet heat exchange structure (18); A circulation pump (9) is installed on the second cold liquid circulation pipeline, and the circulation pump (9) is used to drive the flow of the second fluid in the second cold liquid circulation pipeline.

4. The energy-saving liquid-cooled energy storage cabinet thermal management system according to claim 1, characterized in that: A heater (15) is installed in the water tank (4).

5. The energy-saving liquid-cooled energy storage cabinet thermal management system according to claim 1 is characterized in that: A temperature sensor (16) is installed in the water tank (4); and a flow sensor is also provided on the first cold liquid circulation pipeline.

6. The energy-saving liquid-cooled energy storage cabinet thermal management system according to claim 3 is characterized in that: The pipe in the first cold liquid circulation pipeline is connected to the input end and the output end of the energy storage cabinet heat exchange structure (18) through quick-connect connectors.

7. The energy-saving liquid-cooled energy storage cabinet thermal management system according to claim 6, characterized in that: The energy storage cabinet heat exchange structure (18) is a PACK water cooling plate.

8. The energy-saving liquid-cooled energy storage cabinet thermal management system according to claim 1, characterized in that: A drying filter (12) is also provided on the pipeline between the output end of the water-cooled subcooler (3) and the expansion valve (6) to dry the fluid.

9. The energy-saving liquid-cooled energy storage cabinet thermal management system according to claim 3 is characterized in that: The second cold liquid circulation pipeline also includes a pipeline loop communicating between the second fluid input end of the heat exchanger (5) and the water tank (4); The second cold liquid circulation pipeline is also provided with a control component, and the control component is used to switch the circulation circuit of the liquid inside the first cold liquid circulation pipeline and the second cold liquid circulation pipeline; The control component is an electric valve.

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