An efficient thermal management unit for lithium battery energy storage

Abstract

The present invention discloses an efficient thermal management unit for lithium battery energy storage, which includes a box body. Inside the box body, a three-way two-position solenoid valve A and a three-way two-position solenoid valve B are also installed. The first valve port of the three-way two-position solenoid valve A and the third valve port of the three-way two-position solenoid valve B are both connected to a shell-and-tube condenser through an antifreeze pipeline. The second valve port of the three-way two-position solenoid valve A and the fourth valve port of the three-way two-position solenoid valve B are both connected to a low-temperature radiator through an antifreeze pipeline. Another valve port of the three-way two-position solenoid valve A is connected to the input end of a water pump through an antifreeze pipeline, and another valve port of the three-way two-position solenoid valve B is connected to the output end of the water pump through an antifreeze pipeline. The other end of the low-temperature radiator is connected to a plate heat exchanger through an antifreeze pipeline. By controlling the relative valve ports of the three-way two-position solenoid valve A and the three-way two-position solenoid valve B and the water pump, the present invention changes the operation mode of the antifreeze in the management unit, so as to achieve a refrigeration mode and a heating mode.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery equipment, and particularly to a high-efficiency thermal management unit for lithium battery energy storage. Background Art

[0002] With the rise of new energy electric vehicles, for the core components of new energy electric vehicles, the development and improvement of the use efficiency of power batteries are the key points that the relevant industries need to focus on. The development of power batteries is particularly rapid. However, during the development process, the cooling and heating problems of power batteries are particularly prominent because this involves their charging and discharging efficiency. Currently, the optimal operating temperature of lithium battery power batteries is 20 - 45°C. Therefore, different treatments need to be carried out on lithium batteries in different environments. In hot summers, the power batteries need to be cooled, in seasons like spring and autumn, only appropriate cooling is required, and in cold winters, heating and temperature increase are needed. This requires upgrades and modifications to the cooling system of power batteries. However, in the current industry, traditional lithium battery packs mainly use a single compression refrigeration system for refrigeration. This refrigeration method is relatively single, resulting in the inability to cool according to different environmental problems, waste of energy consumption, and when the heating function is required, a PTC heater must be added, which will increase the production cost. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-efficiency thermal management unit for lithium battery energy storage to solve the problems raised in the above background art.

[0004] To solve the above technical problems, the present invention provides the following technical solution: A high-efficiency thermal management unit for lithium battery energy storage, including a box body, a shell-and-tube condenser, a compressor, a plate heat exchanger, a water pump, a low-temperature radiator, and an antifreeze pipeline. An inlet pipe and an outlet pipe are installed on one side of the box body. The shell-and-tube condenser is connected to the inlet pipe through the antifreeze pipeline. A three-way two-position solenoid valve A and a three-way two-position solenoid valve B are also installed inside the box body. The first valve port of the three-way two-position solenoid valve A and the third valve port of the three-way two-position solenoid valve B are both connected to the shell-and-tube condenser through the antifreeze pipeline. The second valve port of the three-way two-position solenoid valve A and the fourth valve port of the three-way two-position solenoid valve B are both connected to the low-temperature radiator through the antifreeze pipeline. Another valve port of the three-way two-position solenoid valve A is connected to the input end of the water pump through the antifreeze pipeline. Another valve port of the three-way two-position solenoid valve B is connected to the output end of the water pump through the antifreeze pipeline. The other end of the low-temperature radiator is connected to the plate heat exchanger through the antifreeze pipeline. The plate heat exchanger is connected to the outlet pipe through the antifreeze pipeline.

[0005] Further, a heat dissipation fan is installed on one side of the box body relative to the low-temperature radiator, and the number of the heat dissipation fans is two.

[0006] Further, the shell-and-tube condenser, the compressor and the plate heat exchanger are connected through a refrigerant pipeline, and a liquid injection pipeline is also installed on one side of the shell-and-tube condenser.

[0007] Further, a controller and a debugging panel are also installed in the box body, and the controller, the debugging panel, the compressor, the water pump and the heat dissipation fan are connected through signals.

[0008] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0009] By controlling the relative valve ports of the switch three-way two-position solenoid valve A and the three-way two-position solenoid valve B, the water pump changes the operation mode of the antifreeze in the management unit, so that the refrigeration mode and the heating mode can be achieved, saving costs and reducing energy consumption; the low-temperature radiator and the heat dissipation fan can increase the working mode and reduce energy consumption. Description of the Drawings

[0010] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0011] Figure 1 is a schematic structural diagram of the front of the present invention;

[0012] Figure 2 is a front view of the present invention;

[0013] Figure 3 is a schematic structural diagram of the back of the present invention;

[0014] Figure 4 is a rear view of the present invention;

[0015] Figure 5 is a three-dimensional schematic diagram of the interior of the present invention;

[0016] Figure 6 is a working principle diagram of the present invention.

[0017] In the figure: 1. Box body; 2. Shell-and-tube condenser; 3. Compressor; 4. Plate heat exchanger; 5. Water pump; 6. Low-temperature radiator; 7. Antifreeze pipeline; 8. Liquid inlet pipe; 9. Liquid outlet pipe; 10. Three-way two-position solenoid valve A; 11. Three-way two-position solenoid valve B; 12. First valve port; 13. Second valve port; 14. Third valve port; 15. Fourth valve port; 16. Heat dissipation fan; 17. Refrigerant pipeline; 18. Liquid injection pipeline; 19. Controller; 20. Debugging panel. Specific Embodiment

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Embodiment 1:

[0020] As shown in the accompanying drawings of the specification Figures 1 to 5 A high-efficiency thermal management unit for lithium battery energy storage includes a box body 1, a shell-and-tube condenser 2, a compressor 3, a plate heat exchanger 4, a water pump 5, a low-temperature radiator 6, and an antifreeze pipeline 7. An inlet pipe 8 and an outlet pipe 9 are installed on one side of the box body 1. The shell-and-tube condenser 1 and the inlet pipe 8 are connected through the antifreeze pipeline 7. A three-way two-position solenoid valve A10 and a three-way two-position solenoid valve B11 are also installed inside the box body 1. The first valve port 12 of the three-way two-position solenoid valve A10 and the third valve port 14 of the three-way two-position solenoid valve B11 are both connected to the shell-and-tube condenser 2 through the antifreeze pipeline 7. The second valve port 13 of the three-way two-position solenoid valve A10 and the fourth valve port 15 of the three-way two-position solenoid valve B11 are both connected to the low-temperature radiator 6 through the antifreeze pipeline 7. Another valve port of the three-way two-position solenoid valve A10 and the input end of the water pump 5 are connected through the antifreeze pipeline 7. Another valve port of the three-way two-position solenoid valve B11 and the output end of the water pump 5 are connected through the antifreeze pipeline 7. The other end of the low-temperature radiator 6 and the plate heat exchanger 4 are connected through the antifreeze pipeline 7. The plate heat exchanger 4 and the outlet pipe 9 are connected through the antifreeze pipeline 7.

[0021] In order to increase the working mode and adapt to more external environments in the refrigeration mode, when the external environment is not too high and cooling is required, energy consumption can be reduced while cooling. Further, a cooling fan 16 is installed on the side of the box body 1 opposite to the low-temperature radiator 6, and the number of cooling fans 16 is two.

[0022] In order to inject antifreeze before operation to make the water pump 5 run, further, the shell-and-tube condenser 2, the compressor 3, and the plate heat exchanger 4 are connected through a refrigerant pipeline 17, and an injection pipeline 18 is also installed on one side of the shell-and-tube condenser 2.

[0023] In order to better control the compressor 3, the water pump 5, and the cooling fan 16 and adjust according to the actual situation to improve the use efficiency, further, a controller 19 and a debugging panel 20 are also installed inside the box body 1, and the controller 19, the debugging panel 20, the compressor 3, the water pump 5, and the cooling fan 16 are connected through signals.

[0024] The present invention changes the operation mode of the antifreeze in the management unit by controlling the relative valve ports of the switch three-way two-position solenoid valve A10 and the three-way two-position solenoid valve B11, so that the water pump 5 can achieve the refrigeration mode and the heating mode, saving costs and reducing energy consumption; the low-temperature radiator 6 and the cooling fan 16 can increase the working mode and reduce energy consumption.

[0025] Embodiment 2:

[0026] As shown in the attached drawings of the specification Figure 6 A lithium battery energy storage high-efficiency thermal management unit shown in the figure has two working modes in the attached drawings, namely the refrigeration mode and the heating mode. The refrigeration mode can be divided into three gears according to the refrigeration intensity, namely the low gear, the medium gear and the high gear. In the low gear and the medium gear, different numbers of cooling fans are turned on for implementation, and in the high gear, the compressor is additionally turned on for operation. The refrigeration operation paths of these three gears are the same;

[0027] Taking the operation mode of the high gear as an example, first, a part of the antifreeze is injected through the liquid injection pipe 18 to make the water pump 5 and the like inside it operate. Then the compressor starts to work. The refrigerant is pressurized by the compressor and turns from gaseous to liquid after being cooled by the shell-and-tube condenser 2. The liquid refrigerant enters the plate heat exchanger 4 and is absorbed in the plate heat exchanger 4, changing from liquid to gaseous and circulating continuously to cool the antifreeze. At this time, the antifreeze enters the shell-and-tube condenser 2 from the inlet pipe. Since the refrigerant turns from gaseous to liquid, the antifreeze will be heated. At this time, the first valve port 12 of the three-way two-position solenoid valve A10 and the third valve port 14 of the three-way two-position solenoid valve B11 are opened, and the second valve port 13 of the three-way two-position solenoid valve A10 and the fourth valve port 15 of the three-way two-position solenoid valve B11 are closed. The antifreeze enters the water pump through the first valve port 12 of the three-way two-position solenoid valve A10, and then flows through the third valve port 14 of the three-way two-position solenoid valve B11 and enters the low-temperature radiator 6 for cooling by the outside air and the cooling fan, and then flows to the plate heat exchanger 4. Since the change from liquid to gaseous will absorb heat and cool the antifreeze, the finally cooled antifreeze goes out through the outlet pipe, so that the antifreeze going out through the outlet pipe can always maintain an appropriate temperature;

[0028] When in the heating mode, the running direction of the antifreeze is reversed. At this time, the rotation direction and the flow direction of the water pump remain unchanged. The running mode of the refrigerant in the shell-and-tube condenser 2, the compressor 3, and the plate heat exchanger 4 remains unchanged. The antifreeze enters from the liquid outlet pipe and first passes through the plate heat exchanger 4, where there will be a slight temperature drop. The antifreeze after the temperature drop flows through the low-temperature radiator 6. At this time, the difference is that the second valve port 13 of the three-way two-position solenoid valve A10 and the fourth valve port 15 of the three-way two-position solenoid valve B11 are opened, and the first valve port 12 of the three-way two-position solenoid valve A10 and the third valve port 14 of the three-way two-position solenoid valve B11 are closed. It enters the water pump through the second valve port 13 of the three-way two-position solenoid valve A10 and then enters the shell-and-tube condenser 2 through the fourth valve port 15 of the three-way two-position solenoid valve B11. The refrigerant changes from gaseous state to liquid state, so the antifreeze will be heated up and then flow out through the liquid inlet pipe to heat the battery, so that the battery always maintains a suitable temperature.

[0029] Temperature sensors are installed on the outer sides of both the liquid inlet pipe and the liquid outlet pipe, and the temperature is transmitted to the controller in real time. In order to facilitate the switching between modes and the start and stop of the compressor and the water pump, during the switching between the refrigeration mode and the heating mode, mainly by shutting down the water pump and then adjusting the opening and closing of different valve ports of the three-way two-position solenoid valve A10 and the three-way two-position solenoid valve B11, the running direction of the antifreeze in the equipment is realized. The overall structure is compact, with multiple working modes while reducing energy consumption, avoiding adding PTC electric heating components, and reducing costs.

[0030] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An efficient thermal management unit for lithium battery energy storage, comprising a box body (1), a shell-and-tube condenser (2), a compressor (3), a plate heat exchanger (4), a water pump (5), a low-temperature radiator (6) and an antifreeze pipeline (7), characterized in that: One side of the box body (1) is provided with a liquid inlet pipe (8) and a liquid outlet pipe (9). The shell-and-tube condenser (2) and the liquid inlet pipe (8) are connected through the antifreeze pipeline (7). A three-way two-position solenoid valve A (10) and a three-way two-position solenoid valve B (11) are also installed in the box body (1). The first valve port (12) of the three-way two-position solenoid valve A (10) and the third valve port (14) of the three-way two-position solenoid valve B (11) are both connected to the shell-and-tube condenser (2) through the antifreeze pipeline (7). The second valve port (13) of the three-way two-position solenoid valve A (10) and the fourth valve port (15) of the three-way two-position solenoid valve B (11) are both connected to the low-temperature radiator (6) through the antifreeze pipeline (7). Another valve port of the three-way two-position solenoid valve A (10) and the input end of the water pump (5) are connected through the antifreeze pipeline (7). Another valve port of the three-way two-position solenoid valve B (11) and the output end of the water pump (5) are connected through the antifreeze pipeline (7). The other end of the low-temperature radiator (6) and the plate heat exchanger (4) are connected through the antifreeze pipeline (7). The plate heat exchanger (4) and the liquid outlet pipe (9) are connected through the antifreeze pipeline (7). In the refrigeration mode, the antifreeze enters the shell-and-tube condenser from the liquid inlet pipe. The first valve port of the three-way two-position solenoid valve A and the third valve port of the three-way two-position solenoid valve B are opened, and the second valve port of the three-way two-position solenoid valve A and the fourth valve port of the three-way two-position solenoid valve B are closed. The antifreeze enters the water pump through the first valve port of the three-way two-position solenoid valve A, and then flows through the third valve port of the three-way two-position solenoid valve B into the low-temperature radiator for cooling by the outside air and the cooling fan. Then it flows into the plate heat exchanger. Since the liquid changing to gas will absorb heat and cool the antifreeze, finally the cooled antifreeze goes out through the liquid outlet pipe, making the antifreeze going out through the liquid outlet pipe always maintain a suitable temperature. In the heating mode, the antifreeze enters from the liquid outlet pipe. First, it passes through the plate heat exchanger. The cooled antifreeze flows through the low-temperature radiator. The second valve port of the three-way two-position solenoid valve A and the fourth valve port of the three-way two-position solenoid valve B are opened, and the first valve port of the three-way two-position solenoid valve A and the third valve port of the three-way two-position solenoid valve B are closed. It enters the water pump through the second valve port of the three-way two-position solenoid valve A, and then enters the shell-and-tube condenser through the fourth valve port of the three-way two-position solenoid valve. As the refrigerant changes from gas to liquid, the antifreeze will be heated up, and then it flows out through the liquid inlet pipe to heat the battery, making the battery always maintain a suitable temperature.

2. An efficient thermal management unit for lithium battery energy storage according to claim 1, characterized in that: On one side of the box body (1) relative to the low-temperature radiator (6), two cooling fans (16) are installed.

3. An efficient thermal management unit for lithium battery energy storage according to claim 1, characterized in that: The shell-and-tube condenser (2), the compressor (3) and the plate heat exchanger (4) are connected through a refrigerant pipeline (17). A liquid injection pipeline (18) is also installed on one side of the shell-and-tube condenser (2).

4. The high-efficiency thermal management unit for lithium battery energy storage according to claim 2, wherein: A controller (19) and a debugging panel (20) are also installed in the box body (1), and the controller (19), the debugging panel (20), the compressor (3), the water pump (5) and the cooling fan (16) are signal-connected to each other.

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