Energy storage heat management system with fluorine pump natural cooling circulation

Abstract

The utility model relates to an energy storage heat management system with fluorine pump natural cooling circulation, comprising a refrigerant main loop configured to circulate a refrigerant, and the refrigerant in the refrigerant main loop can cool a battery cell; the refrigerating system assembly is arranged on the refrigerant main loop, and the refrigerating system assembly comprises a compressor; the condensing assembly is communicated with the compressor; the throttling element is communicated with the condensation assembly; the heat exchange assembly is configured to cool the battery cell; the first branch communicates with the refrigerant main loop, and the two ends of the first branch are connected to the upstream and the downstream of a compressor correspondingly; the second branch communicates with the refrigerant main loop, and the two ends of the second branch are connected to the upstream and the downstream of the throttling element correspondingly; the one-way valve is arranged on the first branch; the electromagnetic valve is arranged on the second branch; and the fluorine pump is arranged on the second branch.

Description

Technical Field

[0001] The utility model relates to the technical field of heat management, in particular to an energy storage heat management system with a fluorine pump natural cooling cycle. Background Art

[0002] Thermal management refers to the management and control of the temperature of the overall system, individual components, or their environment, with the goal of maintaining proper operation or improving the performance or lifespan of each component. Currently, thermal management is commonly required in fields such as electrochemical energy storage, where it significantly impacts the performance, lifespan, and safety of energy storage systems.

[0003] Most of the thermal management systems currently used for energy storage do not have a fluorine pump natural cooling module, and have the following defects:

[0004] (1) When the thermal management unit does not have the natural cooling function, if the unit is under low load conditions, the unit energy efficiency is low and the power consumption is high;

[0005] (2) When the thermal management unit does not have a natural cooling function, the unit is prone to frequent start and stop, which affects the service life of system components;

[0006] (3) When the thermal management unit has no natural cooling function, the internal system components of the unit will run for a long time, the service life of the whole unit will be shortened, and the return on investment will be low;

[0007] Existing energy storage thermal management units with integrated free cooling essentially add a second heat exchanger near the condenser to transfer heat via the coolant. However, this approach suffers from high fan backpressure, high fan speed, and high noise levels. The coolant circuit also has numerous interfaces, increasing the risk of leaks. Utility Model Content

[0008] In order to solve at least some of the above problems in the prior art, the present invention provides an energy storage thermal management system with a fluorine pump natural cooling cycle, comprising:

[0009] a refrigerant main circuit configured to circulate refrigerant, wherein the refrigerant in the refrigerant main circuit is capable of cooling the battery cells;

[0010] A refrigeration system component is provided on the refrigerant main circuit, and the refrigeration system component comprises:

[0011] compressor;

[0012] a condensing assembly in communication with the compressor;

[0013] a throttling element in communication with the condensing assembly;

[0014] a heat exchange assembly configured to cool the battery cell;

[0015] a first branch, which is in communication with the refrigerant main circuit, with two ends of the first branch respectively connected to the upstream and downstream of the compressor;

[0016] a second branch, which is in communication with the refrigerant main circuit, with two ends of the second branch respectively connected to the upstream and downstream of the throttling element;

[0017] a one-way valve disposed on the first branch;

[0018] A solenoid valve is provided on the second branch; and

[0019] A fluorine pump is provided on the second branch.

[0020] Furthermore, the condensation component includes a condenser and a condenser heat exchange fan.

[0021] Furthermore, the heat exchange assembly includes a lower direct cooling plate and an upper direct cooling plate, and the lower direct cooling plate and the upper direct cooling plate are respectively located on both sides of the battery core.

[0022] Furthermore, the heat exchange component further includes:

[0023] a lower direct cooling plate inlet throttle valve, configured to control the flow of refrigerant entering the lower direct cooling plate;

[0024] The upper direct cooling plate inlet throttle valve is configured to control the flow of refrigerant entering the upper direct cooling plate.

[0025] Furthermore, the refrigerant main circuit includes a cooling circuit and a cooling branch circuit connected to the cooling circuit.

[0026] Furthermore, both ends of the cooling branch are connected to the cooling circuit via a three-way adapter.

[0027] Furthermore, the compressor, condensing assembly, throttling element, lower direct cooling plate inlet throttle valve, and lower direct cooling plate are sequentially arranged on the cooling circuit, and the upper direct cooling plate inlet throttle valve and upper direct cooling plate are arranged on the cooling branch.

[0028] Furthermore, it also includes:

[0029] The exhaust gas temperature sensor is installed at the outlet of the compressor to detect the temperature of the refrigerant discharged from the compressor.

[0030] The exhaust pressure sensor is installed at the outlet of the compressor to detect the pressure of the refrigerant discharged from the compressor;

[0031] A suction temperature sensor, which is located at the inlet of the compressor and detects the temperature of the refrigerant entering the compressor; and

[0032] The suction pressure sensor is installed at the inlet of the compressor to detect the pressure of the refrigerant entering the compressor.

[0033] Furthermore, it also includes:

[0034] A lower direct cooling plate outlet temperature sensor is provided at the outlet of the lower direct cooling plate to detect the temperature of the refrigerant after cooling the battery core;

[0035] The upper direct cooling plate outlet temperature sensor is set at the outlet of the upper direct cooling plate to detect the temperature of the refrigerant after cooling the battery core.

[0036] The present invention has at least the following beneficial effects: (1) The thermal management system of the present invention integrates the natural cooling function of the fluorine pump, which can improve the energy efficiency of the whole machine under low-load conditions and save electricity costs; (2) The integrated natural cooling function of the fluorine pump can extend the service life of the unit and enhance the safety and reliability of the system operation; (3) When the fluorine pump direct cooling system circulation is adopted, the secondary heat exchange of the coolant on the evaporation side is eliminated, and the refrigerant and the battery cell are directly used for heat exchange, which has higher heat exchange efficiency; (4) When the fluorine pump direct cooling system circulation is adopted, the existence of the coolant in the entire energy storage system is eliminated, and the risk of leakage is completely eliminated; (5) The use of the fluorine pump circulation can reduce the fan back pressure and reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] To further illustrate the above and other advantages and features of various embodiments of the present invention, a more detailed description of various embodiments of the present invention will be presented with reference to the accompanying drawings. It will be understood that these drawings depict only typical embodiments of the present invention and are not to be considered as limiting the scope thereof. In the drawings, for clarity, identical or corresponding components will be represented by the same or similar reference numerals.

[0038] Figure 1 A schematic diagram of an energy storage thermal management system with a fluorine pump natural cooling cycle according to an embodiment of the present utility model is shown.

[0039] Figure 2 A schematic diagram of a refrigeration cycle thermal management system according to an embodiment of the present invention is shown.

[0040] Figure 3 The figure shows a pressure-enthalpy diagram of a refrigeration cycle according to an embodiment of the present invention.

[0041] Figure 4 A schematic diagram of a fluorine pump circulation natural cooling system according to an embodiment of the present utility model is shown.

[0042] Figure 5 The figure shows a pressure-enthalpy diagram of natural cooling of a fluorine pump cycle according to an embodiment of the present invention.

[0043] Reference numerals:

[0044] Compressor 1, exhaust temperature sensor 2, exhaust pressure sensor 3, one-way valve 4, condenser 5, condenser heat exchange fan 6, solenoid valve 7, fluorine pump 8, throttling element 9, lower direct cooling plate inlet throttle valve 10, battery cell 11, lower direct cooling plate 12, lower direct cooling plate outlet temperature sensor 13, upper direct cooling plate inlet throttle valve 14, upper direct cooling plate 15, upper direct cooling plate outlet temperature sensor 16, three-way adapter 17, intake temperature sensor 18, intake pressure sensor 19, cooling circuit 20, cooling branch 21, first branch 22, second branch 23. DETAILED DESCRIPTION

[0045] It should be noted that components in the drawings may be shown exaggerated for illustrative purposes and are not necessarily true to scale.

[0046] In the present invention, each embodiment is only intended to illustrate the solution of the present invention and should not be understood as limiting.

[0047] In the present invention, unless otherwise specified, the quantifiers "a" and "an" do not exclude the presence of multiple elements.

[0048] It should also be pointed out that in the embodiments of the present invention, for the sake of clarity and simplicity, only a portion of the parts or components may be shown, but a person skilled in the art will understand that under the guidance of the present invention, the required parts or components may be added according to the needs of the specific scenario.

[0049] It should also be pointed out that within the scope of the present invention, the terms "same", "equal", "equal to" and so on do not mean that the two values are absolutely equal, but allow a certain reasonable error, that is, the terms also cover "substantially the same", "substantially equal", "substantially equal to".

[0050] It should also be noted that in the description of this utility model, the terms "center," "longitudinal," "transverse," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not explicitly or implicitly state that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In addition, the embodiments of the present invention describe the process steps in a specific order, but this is only for the convenience of distinguishing the steps, and does not limit the order of the steps. In different embodiments of the present invention, the order of the steps can be adjusted according to the adjustment of the process.

[0052] In the present invention, high temperature > low temperature, high pressure > low pressure.

[0053] Figure 1 A schematic diagram of an energy storage thermal management system with a fluorine pump natural cooling cycle according to an embodiment of the present utility model is shown.

[0054] like Figure 1 As shown, an energy storage thermal management system with a fluorine pump natural cooling cycle includes a refrigerant main circuit, a refrigeration system component, a one-way valve 4, a solenoid valve 7, a fluorine pump 8, a first branch 22, and a second branch 23.

[0055] The main refrigerant circuit is configured to circulate refrigerant, wherein the refrigerant in the main refrigerant circuit is capable of cooling the battery cells. The main refrigerant circuit includes a cooling circuit 20 and a cooling branch 21 connected to the cooling circuit 20. Two three-way adapters 17 connect the ends of the cooling branch 21 to the cooling circuit 20.

[0056] The refrigeration system components are installed in the main refrigerant circuit and include a compressor 1, a condensing assembly, a throttling element 9, and a heat exchange assembly. The condensing assembly is connected to the compressor 1 and is used to condense the refrigerant discharged from the compressor. The condensing assembly includes a condenser 5 and a condenser heat exchange fan 6. The throttling element 9 is connected to the condenser 5. The throttling element 9 can be an expansion valve, capillary tube, or throttling tube.

[0057] The heat exchange assembly includes a lower direct cooling plate 12 and an upper direct cooling plate 15. It also includes a lower direct cooling plate inlet throttle valve 10 and an upper direct cooling plate inlet throttle valve 14. These valves control the flow of refrigerant entering the lower and upper direct cooling plates 12 and 15.

[0058] Specifically, the compressor 1, the condenser 5, the condenser heat exchange fan 6, the throttling element 9, the lower direct cooling plate inlet throttle valve 10, and the lower direct cooling plate 12 are arranged in sequence on the cooling circuit 20, and the upper direct cooling plate inlet throttle valve 14 and the upper direct cooling plate 15 are arranged on the cooling branch 21.

[0059] The battery core 11 is located between the lower direct cooling plate 12 and the upper direct cooling plate 15 , and the refrigerant passes through the lower direct cooling plate 12 and the upper direct cooling plate 15 to cool the battery core 11 .

[0060] The first branch 22 is connected to the main refrigerant circuit. Its two ends are connected upstream and downstream of the compressor 1, respectively, allowing the refrigerant to bypass the compressor. A one-way valve 4 is provided on the first branch 22 to control whether the refrigerant enters the first branch 22.

[0061] The second branch 23 is connected to the main refrigerant circuit, and the two ends of the second branch 23 are respectively connected to the upstream and downstream of the throttling element 9, so that the refrigerant can bypass the throttling element 9.

[0062] The solenoid valve 7 and the fluorine pump 8 are arranged on the second branch 23 , and the solenoid valve 7 can control whether the refrigerant enters the second branch 23 .

[0063] The above-mentioned thermal management system also includes: an exhaust temperature sensor 2, an exhaust pressure sensor 3, a lower direct cooling plate outlet temperature sensor 13, an upper direct cooling plate outlet temperature sensor 16, an intake temperature sensor 18, and an intake pressure sensor 19.

[0064] The exhaust gas temperature sensor 2 and the exhaust gas pressure sensor 3 are provided at the outlet of the compressor 1 to detect the temperature and pressure of the refrigerant discharged from the compressor.

[0065] The intake temperature sensor 18 and the intake pressure sensor 19 are provided at the inlet of the compressor 1 to detect the temperature and pressure of the refrigerant entering the compressor.

[0066] The lower direct cooling plate outlet temperature sensor 13 is set at the outlet of the lower direct cooling plate 12 to detect the refrigerant temperature after cooling the battery core. The upper direct cooling plate outlet temperature sensor 16 is set at the outlet of the upper direct cooling plate 15 to detect the refrigerant temperature after cooling the battery core.

[0067] Figure 2 A schematic diagram of a refrigeration cycle thermal management system according to an embodiment of the present invention is shown. Figure 3 The figure shows a pressure-enthalpy diagram of a refrigeration cycle according to an embodiment of the present invention.

[0068] When the ambient temperature is high and the fluorine pump is no longer able to meet the cooling needs, it is necessary to switch from the fluorine pump to compressor cooling. For example, when the ambient temperature is above 15℃, compressor cooling is economical and efficient.

[0069] like Figure 2As shown, the one-way valve 4 and the solenoid valve 7 are closed, and the compressor 1 is running. The refrigerant is discharged from the outlet of the compressor 1, passes through the condenser 5 and the throttling element 9 in sequence, and reaches the three-way adapter 17. The three-way adapter 17 divides the refrigerant. Part of the refrigerant flows to the throttle valve 10 at the inlet of the lower direct cooling plate and the lower direct cooling plate 12 to cool the battery cells, and then enters the compressor. The other part of the refrigerant flows to the cooling branch 21, flows to the throttle valve 14 at the inlet of the upper direct cooling plate 15 and the upper direct cooling plate 15 to cool the battery cells. The refrigerant in the cooling branch 21 then merges into the cooling circuit and enters the compressor.

[0070] Compressor 1 serves as the power source for the refrigerant circulation in the system, compressing the refrigerant. The compressed high-temperature and high-pressure gas refrigerant passes through the condenser 5. The condenser heat exchange fan 6 draws air at normal temperature into the condenser fins. The condenser 5 exchanges heat between the high-temperature and high-pressure refrigerant and the air, and the refrigerant is condensed into a medium-temperature and high-pressure liquid. The refrigerant then enters the throttling element 9, which throttles the refrigerant. The throttled refrigerant expands rapidly and becomes a low-temperature and low-pressure liquid. It then enters the lower direct cooling plate 12 and the upper direct cooling plate 15. The refrigerant absorbs heat from the battery cells in the lower direct cooling plate 12 and the upper direct cooling plate 15, and the refrigerant becomes a low-temperature and low-pressure gas and returns to the compressor 1.

[0071] like Figure 3 As shown, a→b is the isentropic compression process of the refrigerant in the compressor;

[0072] b→c is the isobaric heat release process of the refrigerant in the condenser;

[0073] c→d is the isenthalpic throttling process of the refrigerant in the throttling element;

[0074] d→a is the isobaric heat absorption process of the refrigerant in the lower direct cooling plate and the upper direct cooling plate.

[0075] Figure 4 A schematic diagram of a fluorine pump circulation natural cooling system according to an embodiment of the present utility model is shown. Figure 5 The figure shows a pressure-enthalpy diagram of natural cooling of a fluorine pump cycle according to an embodiment of the present invention.

[0076] When the ambient temperature is low and there is a low cooling demand, using a compressor for cooling will cause the compressor to start and stop frequently, which is uneconomical and inefficient. At this time, a fluorine pump can be used for cooling, which has high operating efficiency and is more economical and efficient. For example, when the ambient temperature is 5 to 10℃, a fluorine pump can be used for cooling.

[0077] like Figure 4 As shown, the one-way valve 4 and the solenoid valve 7 are open, the compressor 1 is closed, and the throttling element 9 is closed. The fluorine pump 8 serves as the power source for the refrigerant circulation in the system.

[0078] Liquid refrigerant is discharged from fluorine pump 8, passes through lower and upper direct cooling plate inlet throttle valves 10 and 14, and then enters lower and upper direct cooling plate 12 and 15, respectively. It then exchanges heat with battery cells 11 and is discharged as gaseous refrigerant. When the gaseous refrigerant passes through condenser 5, it exchanges heat with the environment via condenser heat exchange fan 6, condensing into liquid refrigerant. It then flows back to fluorine pump 8 through solenoid valve 7.

[0079] like Figure 5 As shown, A→B: the refrigerant pressurization process in the fluorine pump;

[0080] B→C: Isobaric heat absorption process of the refrigerant in the lower and upper direct cooling plates;

[0081] C→D; the isothermal pressure reduction process of the refrigerant in the pipeline after cooling the battery core;

[0082] D→A: The refrigerant releases heat at equal pressure in the condenser.

[0083] At the same heat exchange rate and evaporation pressure, the latent heat of vaporization △h in the evaporator (direct cooling plate) is greater when the fluorine pump circulates, and the refrigerant flow is less;

[0084] At low load, the power consumption of the refrigeration cycle compressor is much greater than that of the fluorine pump cycle; when the cooling capacity demand is low, it is a low load output.

[0085] At low loads, the fluorine pump cycle is more energy efficient than the refrigeration cycle;

[0086] The use of fluorine pump circulation can reduce the number of heat exchangers, lowering costs and space occupancy;

[0087] Using fluorine pump circulation can reduce fan back pressure and reduce fan noise;

[0088] The direct cooling thermal management system does not require secondary heat exchange between coolant (coolant in liquid cooling mode) and battery cells. It directly uses refrigerant and battery cells for heat exchange, which has higher heat exchange efficiency and eliminates the risk of coolant leakage.

[0089] Although certain embodiments of the present invention have been described in this application, those skilled in the art will appreciate that these embodiments are provided for illustrative purposes only. Numerous variations, alternatives, and improvements will be contemplated by those skilled in the art based on the teachings of this invention without departing from the scope of this invention. The appended claims are intended to define the scope of this invention and are intended to encompass methods and structures within the scope of these claims and their equivalents.

Claims

1. An energy storage thermal management system with a natural cooling cycle of a fluorine pump, characterized in that: include: a refrigerant main circuit configured to circulate refrigerant, wherein the refrigerant in the refrigerant main circuit is capable of cooling the battery cells; A refrigeration system component is provided on the refrigerant main circuit, and the refrigeration system component comprises: compressor; a condensing assembly in communication with the compressor; a throttling element in communication with the condensing assembly; a heat exchange assembly configured to cool the battery cell; a first branch, which is in communication with the refrigerant main circuit, with two ends of the first branch respectively connected to the upstream and downstream of the compressor; a second branch, which is in communication with the refrigerant main circuit, with two ends of the second branch respectively connected to the upstream and downstream of the throttling element; a one-way valve disposed on the first branch; A solenoid valve is provided on the second branch; and A fluorine pump is provided on the second branch.

2. The energy storage thermal management system with a fluorine pump natural cooling cycle according to claim 1, characterized in that: The condensing component includes a condenser and a condenser heat exchange fan.

3. The energy storage thermal management system with a fluorine pump natural cooling cycle according to claim 1, characterized in that: The heat exchange assembly includes a lower direct cooling plate and an upper direct cooling plate, and the lower direct cooling plate and the upper direct cooling plate are respectively located on both sides of the battery core.

4. The energy storage thermal management system with a fluorine pump natural cooling cycle according to claim 3, characterized in that: The heat exchange component further includes: a lower direct cooling plate inlet throttle valve, configured to control the flow of refrigerant entering the lower direct cooling plate; The upper direct cooling plate inlet throttle valve is configured to control the flow of refrigerant entering the upper direct cooling plate.

5. The energy storage thermal management system with a fluorine pump natural cooling cycle according to claim 4, characterized in that: The refrigerant main circuit includes a cooling circuit and a cooling branch circuit connected to the cooling circuit.

6. The energy storage thermal management system with a fluorine pump natural cooling cycle according to claim 5, characterized in that: The two ends of the cooling branch are connected to the cooling circuit through a three-way adapter.

7. The energy storage thermal management system with a fluorine pump natural cooling cycle according to claim 5, characterized in that: The compressor, condensing assembly, throttling element, lower direct cooling plate inlet throttle valve, and lower direct cooling plate are sequentially arranged on the cooling circuit, and the upper direct cooling plate inlet throttle valve and upper direct cooling plate are arranged on the cooling branch.

8. The energy storage thermal management system with a fluorine pump natural cooling cycle according to claim 1, characterized in that: Also includes: The exhaust temperature sensor is installed at the outlet of the compressor to detect the temperature of the refrigerant discharged from the compressor; The exhaust pressure sensor is installed at the outlet of the compressor to detect the pressure of the refrigerant discharged from the compressor; The suction temperature sensor is installed at the inlet of the compressor to detect the temperature of the refrigerant entering the compressor; as well as The suction pressure sensor is installed at the inlet of the compressor to detect the pressure of the refrigerant entering the compressor.

9. The energy storage thermal management system with a fluorine pump natural cooling cycle according to claim 4, characterized in that: Also includes: A lower direct cooling plate outlet temperature sensor is provided at the outlet of the lower direct cooling plate to detect the temperature of the refrigerant after cooling the battery core; as well as The upper direct cooling plate outlet temperature sensor is set at the outlet of the upper direct cooling plate to detect the temperature of the refrigerant after cooling the battery core.

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