Thermal management system of energy storage battery

Abstract

The utility model relates to the technical field of energy storage battery management, and discloses an energy storage battery thermal management system, which comprises a first cooling loop, a second cooling loop, a battery cold plate and a compressor refrigeration loop, the first cooling loop and the second cooling loop share a first pipeline and a second pipeline, and the first pipeline and the second pipeline are respectively connected with two ends of the battery cold plate; the first cooling loop provides cooling capacity through the compressor refrigerating loop; the second cooling loop comprises a heat exchanger; the second cooling loop directly utilizes a low-temperature environment to provide cooling capacity through the heat exchanger; the energy storage battery thermal management system is used for selecting the first cooling loop and / or the second cooling loop to cool the battery according to a received cooling mode selection instruction; through the arrangement of the first cooling loop and the second cooling loop, the energy storage battery can be cooled by adopting different cooling loops at different environment temperatures, so that the effects of cooling the battery and being low in energy consumption are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage battery management, and in particular to an energy storage battery thermal management system. Background Art

[0002] As energy storage batteries develop towards high energy density and high charge rate, the heat generated by the batteries during use will continue to increase. Therefore, the batteries must be cooled in time. If the energy storage batteries cannot be cooled in time, the heat in the batteries will continue to accumulate, which may easily lead to thermal runaway of the batteries, shorten the battery life, and even cause greater safety hazards.

[0003] In existing common battery thermal management technologies, when the temperature is too high, cold energy is usually released to the battery energy storage system through a refrigerant circuit to reduce the temperature of the battery energy storage system. However, when the temperature is not too high, using refrigerant to provide cold energy will cause unnecessary energy consumption. Utility Model Content

[0004] In view of this, an embodiment of the present application provides an energy storage battery thermal management system to achieve cooling of the energy storage battery with less energy consumption.

[0005] In a first aspect, an embodiment of the present application provides an energy storage battery thermal management system, comprising: a first cooling circuit, a second cooling circuit, a battery cold plate, and a compressor refrigeration circuit;

[0006] The first cooling circuit and the second cooling circuit share a first pipeline and a second pipeline, and the first pipeline and the second pipeline are respectively connected to two ends of the battery cold plate;

[0007] The first cooling circuit provides cooling capacity via a compressor refrigeration circuit;

[0008] The second cooling circuit includes a heat exchanger; the second cooling circuit utilizes a low temperature environment to provide cooling through the heat exchanger;

[0009] The energy storage battery thermal management system is used to select the first cooling circuit and / or the second cooling circuit to cool the battery according to the received cooling mode selection instruction.

[0010] In some embodiments, the system further comprises a heating circuit;

[0011] A heater is provided on the heating circuit; one end of the heater is connected to the pipeline connecting the first pipeline and the compressor refrigeration circuit, and the other end of the heater is connected to the second pipeline.

[0012] In some embodiments, the energy storage battery thermal management system is configured to, when receiving a first cooling mode, select to turn on the first cooling circuit, turn on the compressor refrigeration circuit, turn off the second cooling circuit, and turn off the heating circuit;

[0013] The energy storage battery thermal management system is configured to, when receiving a second cooling mode, select to close the compressor refrigeration circuit, open the second cooling circuit, and close the heating circuit;

[0014] The energy storage battery thermal management system is used to select, when receiving the third cooling mode, to open the first cooling circuit, open both the second cooling circuits, open the compressor refrigeration circuit, and close the heating circuit.

[0015] In some embodiments, a water pump is provided on the first pipeline;

[0016] The inlet of the water pump is communicated with the outlet of the battery cold plate; the outlet of the water pump is communicated with the compressor refrigeration circuit through a pipeline, and is communicated with the heat exchanger through a pipeline.

[0017] In some embodiments, the compressor refrigeration circuit includes a plate exchanger, a compressor, and a condenser connected in sequence through a pipeline;

[0018] A refrigerant flows through the compressor refrigeration circuit; the refrigerant provides cooling capacity for the first cooling circuit through the compressor refrigeration cycle.

[0019] In some embodiments, the plate exchanger includes a first inlet and a second inlet;

[0020] The inlet of the first inlet and outlet is connected to the first pipeline through a pipeline, and the outlet of the first inlet and outlet is connected to the second pipeline through a pipeline;

[0021] The inlet of the second inlet and outlet is connected to the outlet of the condenser through a pipeline, and the outlet of the second inlet and outlet is connected to the inlet of the compressor through a pipeline;

[0022] The outlet of the compressor is connected to the inlet of the condenser through a pipeline.

[0023] In some embodiments, the condenser and the heat exchanger are arranged side by side in front and back;

[0024] The system further includes a fan; the heat exchanger, the condenser and the fan are arranged in sequence along the air flow direction.

[0025] In some embodiments, a first two-way valve is provided on the heating circuit;

[0026] A second two-way valve is provided on the pipeline connecting the heat exchanger and the second pipeline, or a second two-way valve is provided on the pipeline connecting the heat exchanger and the first pipeline.

[0027] In some embodiments, a third two-way valve is provided on the pipeline connecting the plate exchanger and the second pipeline.

[0028] In some embodiments, water-cooling liquid flows through the first cooling circuit and the second cooling circuit;

[0029] When the water coolant passes through the first cooling circuit, it is cooled by the refrigerant in the plate exchanger and then enters the battery cold plate to cool the battery;

[0030] When the water-cooling liquid is used for cooling through the second cooling circuit, it is cooled by the outdoor air in the heat exchanger and then enters the battery cold plate to cool the battery.

[0031] The embodiments of the present application have the following beneficial effects:

[0032] The present application sets up a first cooling circuit and a second cooling circuit, so that different cooling circuits can be used to cool the energy storage battery at different ambient temperatures. The two cooling circuits provide different sources of cooling, and the energy consumption when providing cooling is also different. Therefore, the present application can achieve the effect of cooling the battery with low energy consumption by reasonably using different cooling circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A structural schematic diagram of an energy storage battery thermal management system according to an embodiment of the present application is shown.

[0035] Description of main component symbols:

[0036] 1-battery cold plate; 2-condenser; 3-heat exchanger; 4-first pipeline; 5-second pipeline; 6-first two-way valve; 7-second two-way valve; 8-water pump; 9-plate heat exchanger; 10-compressor refrigeration circuit; 11-compressor; 12-fan; 13-heating circuit; 14-heater. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0038] The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but rather merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0039] Hereinafter, the terms "including", "having" and their cognates used in various embodiments of the present application are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the aforementioned items, and should not be understood as excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the aforementioned items or adding the possibility of one or more features, numbers, steps, operations, elements, components or combinations of the aforementioned items. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions and should not be understood as indicating or implying relative importance.

[0040] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which the various embodiments of the present application belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meaning as in the context of the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning unless clearly defined in the various embodiments of the present application.

[0041] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0042] During the application process, the temperature of the energy storage battery will become higher and higher. If the energy storage battery cannot be cooled in time, the service life of the energy storage battery will be seriously affected. At present, the energy consumption of the cooling treatment of the energy storage battery is relatively large.

[0043] Based on this, the present application proposes a thermal management system for energy storage batteries with low energy consumption and high efficiency.

[0044] The energy storage battery thermal management system is described below with reference to some specific embodiments.

[0045] Figure 1FIG1 shows a schematic diagram of a structure of a thermal management system for an energy storage battery according to an embodiment of the present application. Figure 1 As shown, the energy storage battery thermal management system includes: a first cooling circuit, a second cooling circuit and a battery cold plate 1.

[0046] The first cooling circuit and the second cooling circuit share a first pipeline 4 and a second pipeline 5, and are connected to the battery cold plate 1 through the first pipeline 4 and the second pipeline 5; that is, when cooling the energy storage battery, the energy storage battery can be cooled by the first cooling circuit, or by the second cooling circuit, or by using the first cooling circuit and the second cooling circuit at the same time.

[0047] The first cooling circuit also includes a compressor refrigeration circuit 10; both ends of the compressor refrigeration circuit 10 are connected to the first pipeline 4 and the second pipeline 5 through pipelines respectively; the second cooling circuit also includes a heat exchanger 3; both ends of the heat exchanger 3 are connected to the first pipeline 4 and the second pipeline 5 respectively through pipelines.

[0048] It can be understood that the first cooling circuit provides cooling through the compressor refrigeration circuit 10, while the second cooling circuit directly utilizes the low-temperature environment to provide cooling through the heat exchanger 3. That is, the first cooling circuit and the second cooling circuit provide different cooling capacities when cooling the energy storage battery, and the energy consumption of the two cooling circuits when cooling the energy storage battery is also different. In this way, the appropriate cooling circuit can be selected to cool the energy storage battery according to actual needs to avoid energy waste.

[0049] The system further includes a heating circuit 13, which is equipped with a heater 14. The heater 14 is connected in parallel with the compressor refrigeration circuit 10. One end of the heater 14 is connected to the first pipe 4, and the other end is connected to the second pipe 5. Heater 14 can be an electric PTC heater. Specifically, when the battery temperature is too low, the electric PTC heater can heat the water coolant in the pipe, thereby raising the battery temperature.

[0050] Furthermore, a first two-way valve 6 is provided on the heating circuit 13 , and the heating circuit 13 is opened and closed by switching the first two-way valve 6 .

[0051] When cooling the battery, the energy storage battery thermal management system is used to select the first cooling circuit and / or the second cooling circuit to cool the battery according to the received cooling mode selection instruction.

[0052] The energy storage battery thermal management system of the present application includes a first cooling mode, a second cooling mode and a third cooling mode, which correspond to a normal mode, an energy-saving mode and a mixed mode, respectively. In specific use, the specific cooling mode to be used can be determined according to the ambient temperature. Under normal circumstances, if the ambient temperature is greater than the first temperature, the normal mode is adopted; if the ambient temperature is less than or equal to the second temperature, the energy-saving mode is adopted; if the ambient temperature is greater than the second temperature and less than or equal to the first temperature, the mixed mode is adopted.

[0053] The energy storage battery thermal management system is used to, when receiving the first cooling mode, that is, when using the conventional mode to cool the battery, open the first cooling circuit, open the compressor refrigeration circuit 10, close the second cooling circuit, close the heating circuit 13, and cool the water coolant in the plate exchanger 9, and then the water coolant enters the battery cold plate 1 to cool the battery.

[0054] The energy storage battery thermal management system is configured to activate both the first and second cooling circuits when the third cooling mode is activated, i.e., when a hybrid mode is used to cool the battery. The compressor refrigeration circuit 10 in the first cooling circuit is activated, while the heating circuit 13 is deactivated. In this cooling mode, the energy storage battery is cooled by the first and second cooling circuits working together. In this mode, if the ambient temperature is low, the second cooling circuit can be activated first. If the second cooling circuit fails to meet the battery cooling requirements, the compressor refrigeration circuit 10 is activated at a low frequency, causing the first cooling circuit to also start operating to assist the second cooling circuit in cooling the battery. Alternatively, both cooling circuits can be activated, and the ratio of water coolant flowing through the first and second cooling circuits can be adjusted by adjusting the opening of the second two-way valve 7. The cooling capacity of the compressor refrigeration circuit can be adjusted by adjusting the power of the compressor 11. In this cooling mode, battery cooling can be adjusted to minimize energy consumption while achieving battery cooling.

[0055] The energy storage battery thermal management system is used to, when receiving the second cooling mode, that is, when using the energy-saving mode to cool the battery, close the compressor refrigeration circuit 10, open the second refrigeration circuit, and close the heating circuit 13. In this mode, the battery is cooled only by the heat exchanger 3.

[0056] Furthermore, a water pump is provided on the first pipeline 4; the inlet of the water pump 8 is connected to the outlet of the battery cold plate 1, and the outlet of the water pump 8 is connected to the plate exchanger of the compressor refrigeration circuit 10 via a pipe, so that when the battery is cooled by the first cooling circuit, the water coolant in the first cooling circuit can flow smoothly in the first cooling circuit. The outlet of the water pump 8 is also connected to the heat exchanger 3 via a pipe, so that when the battery is cooled by the second cooling circuit, the water coolant in the second cooling circuit can flow smoothly in the second cooling circuit.

[0057] It can be understood that the first cooling circuit includes the battery cold plate 1, the first pipeline 4, the compressor refrigeration circuit and the second pipeline 5, and the second cooling circuit includes the battery cold plate 1, the first pipeline 4, the heat exchanger 3 and the second pipeline 5, and the compressor refrigeration circuit 10 is arranged in parallel with the heat exchanger 3. This design makes the structure of the thermal management system of the present application simpler while achieving the effect of cooling the energy storage battery.

[0058] In a specific implementation, the compressor refrigeration circuit includes a plate exchanger 9, a compressor 11 and a condenser 2 connected in sequence through pipelines; the refrigerant flows in the compressor refrigeration circuit 10 and provides cooling capacity for the first cooling circuit through the compressor refrigeration cycle.

[0059] The plate exchanger 9 includes a first inlet and a second inlet and outlet; the inlet of the first inlet and outlet is connected to the first pipeline 4 through a pipeline, that is, the inlet of the first inlet and outlet is connected to the water pump through a pipeline, and the outlet of the first inlet and outlet is connected to the second pipeline 5 through a pipeline; the inlet of the second inlet and outlet is connected to the outlet of the condenser 2 through a pipeline, and the outlet of the second inlet and outlet is connected to the inlet of the compressor 11 through a pipeline; the outlet of the compressor 11 is connected to the inlet of the condenser 2 through a pipeline.

[0060] Typically, the first inlet and outlet of the plate exchanger 9 is located near the battery cold plate 1, and the second inlet and outlet of the plate exchanger 9 is located near the condenser 2. When connected, the outlet of the water pump 8 is connected to the inlet of the plate exchanger 9 near the battery cold plate 1 via a pipe, and the outlet of the plate exchanger 9 near the battery cold plate 1 is connected to the battery cold plate 1 via the second pipe 5. The outlet of the condenser 2 is connected to the inlet of the plate exchanger 9 near the condenser 2 via a pipe, and the outlet of the plate exchanger 9 near the condenser 2 is connected to the compressor 11 via a pipe. Thus, when the energy storage batteries are cooled through the first cooling circuit, the coolant is cooled by the refrigerant in the plate exchanger 9 and then enters the battery cold plate 1, thereby cooling the energy storage batteries.

[0061] In one specific implementation, the inlet of the heat exchanger 3 is connected to the outlet of the water pump 8, and the outlet of the heat exchanger 3 is connected to the second pipeline 5. Thus, when the energy storage battery is cooled by the second cooling circuit, the coolant is cooled by the outdoor air in the heat exchanger 3 before entering the battery cold plate 1, thereby cooling the energy storage battery.

[0062] Furthermore, a second two-way valve 7 is provided on the pipe connecting the heat exchanger 3 and the second pipe 5 or the pipe connecting the heat exchanger 3 and the first pipe 4. In this way, when only the first cooling circuit is needed to cool the battery, the compressor refrigeration circuit 10 is opened and the second cooling circuit is closed by closing the second two-way valve 7.

[0063] When the second cooling circuit is needed to cool the battery, the compressor refrigeration circuit 10 is closed. This means that the coolant in the first cooling circuit is not exchanging heat within the plate exchanger 9. Opening the second two-way valve 7 activates the second cooling circuit, thereby enabling the second cooling circuit to cool the battery. Furthermore, although the compressor 11 is shut down, a small amount of coolant will still flow through the plate exchanger 9 into the second pipeline 5. To prevent the cooling effect of the battery from being affected by the flow of unheated water-cooled liquid within the plate exchanger 9 into the second pipeline 5, a third two-way valve can be installed in the pipeline connecting the plate exchanger 9 and the second pipeline 5. When the first cooling circuit is not needed, the compressor refrigeration circuit 10 and the third two-way valve are closed.

[0064] In a specific implementation, the condenser 2 and the heat exchanger 3 are arranged side by side front and back, that is, the condenser 2 and the heat exchanger 3 are arranged in series front and back, and the heat exchanger 3, the condenser 2 and the fan 12 are arranged in sequence along the air flow direction, so that the condenser 2 and the heat exchanger 3 can share a group of fans 12.

[0065] The present application can realize cooling the energy storage battery by using different cooling circuits at different ambient temperatures through the setting of the first cooling circuit and the second cooling circuit. Especially when the ambient temperature is not high, if the cooling capacity of the compressor refrigeration circuit is fully used to cool the battery, the energy consumption will be large. At this time, the cooling capacity of the compressor refrigeration circuit in the first cooling circuit can be reduced by combining the cooling capacity of the wind-water heat exchanger in the second cooling circuit. 10 energy consumption, so that the battery can be cooled with less energy consumption.

[0066] The above is only a specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed in this application, which should be covered by the scope of protection of the present application.

Claims

1. A thermal management system for an energy storage battery, characterized in that: include: a first cooling circuit, a second cooling circuit, a battery cold plate, and a compressor refrigeration circuit; The first cooling circuit and the second cooling circuit share a first pipeline and a second pipeline, and the first pipeline and the second pipeline are respectively connected to two ends of the battery cold plate; The first cooling circuit provides cooling capacity through the compressor refrigeration circuit; The second cooling circuit includes a heat exchanger, and the second cooling circuit utilizes a low-temperature environment to provide cooling through the heat exchanger; The energy storage battery thermal management system is used to select the first cooling circuit and / or the second cooling circuit to cool the battery according to the received cooling mode selection instruction.

2. The energy storage battery thermal management system according to claim 1, characterized in that: The system also includes a heating circuit; A heater is provided on the heating circuit; one end of the heater is connected to the pipeline connecting the first pipeline and the compressor refrigeration circuit, and the other end of the heater is connected to the second pipeline.

3. The energy storage battery thermal management system according to claim 2, characterized in that: The energy storage battery thermal management system is configured to, when receiving a first cooling mode, select to turn on the first cooling circuit, turn on the compressor refrigeration circuit, turn off the second cooling circuit, and turn off the heating circuit; The energy storage battery thermal management system is configured to, when receiving a second cooling mode, select to close the compressor refrigeration circuit, open the second cooling circuit, and close the heating circuit; The energy storage battery thermal management system is used to select, when receiving the third cooling mode, to open the first cooling circuit, open both the second cooling circuit, open the compressor refrigeration circuit, and close the heating circuit.

4. The energy storage battery thermal management system according to claim 1, characterized in that: A water pump is provided on the first pipeline; The inlet of the water pump is communicated with the outlet of the battery cold plate; the outlet of the water pump is communicated with the compressor refrigeration circuit through a pipeline, and is communicated with the heat exchanger through a pipeline.

5. The energy storage battery thermal management system according to claim 1, characterized in that: The compressor refrigeration circuit includes a plate exchanger, a compressor and a condenser connected in sequence through pipelines; A refrigerant flows through the compressor refrigeration circuit; the refrigerant provides cooling capacity for the first cooling circuit through the compressor refrigeration cycle.

6. The energy storage battery thermal management system according to claim 5, characterized in that: The plate exchanger includes a first inlet and a second inlet; The inlet of the first inlet and outlet is connected to the first pipeline through a pipeline, and the outlet of the first inlet and outlet is connected to the second pipeline through a pipeline; The inlet of the second inlet and outlet is connected to the outlet of the condenser through a pipeline, and the outlet of the second inlet and outlet is connected to the inlet of the compressor through a pipeline; The outlet of the compressor is connected to the inlet of the condenser through a pipeline.

7. The energy storage battery thermal management system according to claim 5, characterized in that: The condenser and the heat exchanger are arranged side by side in front and back; The system further includes a fan; the heat exchanger, the condenser and the fan are arranged in sequence along the air flow direction.

8. The energy storage battery thermal management system according to claim 2, characterized in that: The heating circuit is provided with a first two-way valve; A second two-way valve is provided on the pipeline connecting the heat exchanger and the second pipeline, or a second two-way valve is provided on the pipeline connecting the heat exchanger and the first pipeline.

9. The energy storage battery thermal management system according to claim 5, characterized in that: A third two-way valve is provided on the pipeline communicating between the plate exchanger and the second pipeline.

10. The energy storage battery thermal management system according to claim 6, characterized in that: Water-cooling liquid flows through the first cooling circuit and the second cooling circuit; When the water-cooling liquid is cooled by the refrigerant in the plate exchanger through the first cooling circuit, it enters the battery cold plate to cool the battery; When the water-cooling liquid is used for cooling through the second cooling circuit, it is cooled by the outdoor air in the heat exchanger and then enters the battery cold plate to cool the battery.

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