Cooling device, cooling system and vehicle

Abstract

The application discloses a cooling device, a cooling system and a vehicle, and belongs to the technical field of vehicles. The cooling device comprises a cold plate. The cold plate is provided with a first flow channel group, a second flow channel group and a confluence flow channel, and the first flow channel group and the second flow channel group are symmetrical about the median line of the confluence flow channel. The first flow channel group comprises a plurality of first flow channels in an n type, the plurality of first flow channels are distributed at intervals, and one of the two adjacent first flow channels is arranged around the other first flow channel. The second flow channel group comprises a plurality of second flow channels in an n type, the plurality of second flow channels are distributed at intervals, and one of the two adjacent second flow channels is arranged around the other second flow channel. The midpoint of the confluence flow channel is provided with a liquid outlet, and the liquid outlets of the plurality of first flow channels and the plurality of second flow channels are respectively communicated with the confluence flow channel. The scheme provided in the embodiment of the application can improve the uniformity of the temperature of the cold plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a cooling device, a cooling system and a vehicle. BACKGROUND

[0002] A power battery is an important power source of a new energy vehicle. A power battery generally generates a large amount of heat in the process of charging and discharging. In order to maintain the temperature of the power battery within a certain working range and ensure that the power battery can have better use performance, a cooling device is generally arranged on a vehicle to cool the power battery in time. At present, the cooling methods for the power battery include natural cooling, air cooling, liquid cooling and direct cooling. The direct cooling device has higher cooling efficiency, and is therefore applied more and more in the cooling system of a vehicle.

[0003] In the related art, the cold plate in the direct cooling device is provided with a plurality of levels of branched flow channels. However, the distribution mode of the plurality of levels of flow channels is prone to cause a large temperature difference between different positions of the cold plate. Since the uniformity of the temperature of the cold plate is poor, the uniform cooling of the power battery module cannot be achieved, and thus the cooling effect of the power battery module is poor. SUMMARY

[0004] Therefore, the present application provides a cooling device, a cooling system and a vehicle, which can improve the uniformity of the temperature of the cold plate and thus improve the cooling effect of the power battery module.

[0005] In a first aspect, an embodiment of the present application provides a cooling device, which comprises a cold plate.

[0006] The cold plate is provided with a first flow channel group, a second flow channel group and a confluence flow channel, and the first flow channel group and the second flow channel group are symmetric about the median line of the confluence flow channel.

[0007] The first flow channel group comprises a plurality of first flow channels in the shape of n, and the plurality of first flow channels are distributed at intervals, and one of the first flow channels in adjacent two first flow channels is arranged around the other first flow channel.

[0008] The second flow channel group comprises a plurality of second flow channels in the shape of n, and the plurality of second flow channels are distributed at intervals, and one of the second flow channels in adjacent two second flow channels is arranged around the other second flow channel.

[0009] The confluence flow channel is provided with a liquid outlet at a midpoint thereof, and the liquid outlets of the plurality of first flow channels and the liquid outlets of the plurality of second flow channels are respectively in communication with the confluence flow channel.

[0010] Optionally, the converging flow channel comprises a first portion and a second portion, the first portion and the second portion are located on two sides of the liquid outlet of the converging flow channel respectively, and the length of the first portion is the same as the length of the second portion.

[0011] The liquid outlets of the plurality of first flow channels are in communication with the first portion respectively.

[0012] The liquid outlets of the plurality of second flow channels are in communication with the second portion respectively.

[0013] Optionally, the cooling device further comprises a distributor and a plurality of capillary tubes.

[0014] The liquid inlet of the capillary tube is in communication with the liquid outlet of the distributor, and the liquid outlet of the capillary tube is in communication with the liquid inlet of the corresponding first flow channel or the liquid inlet of the corresponding second flow channel.

[0015] Optionally, the distance between the liquid inlet of the first flow channel or the liquid inlet of the second flow channel and the liquid outlet of the converging flow channel is negatively correlated with the length of the corresponding capillary tube.

[0016] Optionally, the distance between the liquid inlet of the first flow channel or the liquid inlet of the second flow channel and the liquid outlet of the converging flow channel is positively correlated with the inner diameter of the capillary tube.

[0017] Optionally, the distributor has a liquid inlet channel and a plurality of liquid outlet channels.

[0018] The liquid inlet of the liquid inlet channel is adapted to be in communication with a liquid inlet pipe, and the liquid outlet of the liquid inlet channel is in communication with the liquid inlet of each liquid outlet channel respectively.

[0019] The liquid outlet of the liquid outlet channel is in communication with the liquid inlet of the corresponding capillary tube.

[0020] Optionally, the plurality of liquid outlet channels are uniformly distributed along the circumference of the liquid inlet channel.

[0021] Optionally, the axial direction of the distributor is parallel to the direction of gravity.

[0022] In a second aspect, the embodiments of the present application further provide a cooling system, which comprises the cooling device according to any one of the first aspect.

[0023] In a third aspect, the embodiments of the present application further provide a vehicle, which comprises the cooling device according to any one of the first aspect or the cooling system according to any one of the second aspect.

[0024] The cooling device provided by the embodiment of the present application has the first flow channel group, the second flow channel group and the converging flow channel distributed on the cold plate. Since the first flow channel group and the second flow channel group are symmetrical about the median line of the converging flow channel, the temperature of the parts of the cold plate on both sides of the median line of the converging flow channel can be kept consistent, and the uniformity of the temperature of the cold plate can be improved. Meanwhile, the first flow channel group includes a plurality of first flow channels in the n type, the plurality of first flow channels are distributed at intervals, and the first flow channel in each of two adjacent first flow channels is arranged around the other first flow channel. The second flow channel group includes a plurality of second flow channels in the n type, the plurality of second flow channels are distributed at intervals, and the second flow channel in each of two adjacent second flow channels is arranged around the other second flow channel. In this way, each of the first flow channels and the second flow channels does not need to be secondarily classified, and the distribution of the first flow channels and the second flow channels is more uniform, so that the uniformity of the temperature of the cold plate can be improved, and the cooling device can uniformly cool the power battery module, and the cooling effect on the battery can be improved. The midpoint of the converging flow channel is provided with a liquid outlet, and the liquid outlets of the plurality of first flow channels and the liquid outlets of the plurality of second flow channels are respectively communicated with the converging flow channel, so that the refrigerant in the first flow channels and the refrigerant in the second flow channels can flow out from the liquid outlet of the converging flow channel to the outside of the cold plate to complete the cooling process. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 is a structure schematic view of a cold plate in a cooling device provided by the embodiment of the present application;

[0027] Figure 2 is a structure schematic view of a cold plate in a cooling device provided by the embodiment of the present application;

[0028] Figure 3 is a sectional structure schematic view of a distributor in a cooling device provided by the embodiment of the present application;

[0029] Figure 4 is a structure schematic view of a cooling system provided by the embodiment of the present application.

[0030] REFERENCE SIGNS:

[0031] 100, cooling device; 110, cold plate; 120, first flow channel group; 130, second flow channel group; 140, converging flow channel; 141, median vertical line; 142, first part; 143, second part; 121, first flow channel; 122, first sub-flow channel; 123, second sub-flow channel; 124, third sub-flow channel; 131, second flow channel;

[0032] 200, distributor; 210, liquid inlet channel; 220, liquid outlet channel;

[0033] 300, capillary tube;

[0034] 400, compressor;

[0035] 500, condenser;

[0036] 600, passenger cabin evaporator;

[0037] 700, first expansion valve;

[0038] 800, second expansion valve.

[0039] The specific embodiments of the present application have been shown and described in the above drawings, and will be described in more detail hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative work fall within the scope of protection of the present application.

[0041] Unless otherwise defined, all the technical terms used in the embodiments of the present application have the same meanings as commonly understood by those skilled in the art.

[0042] In order to make the technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below in combination with the drawings.

[0043] In a first aspect, in combination with Figure 1 As shown in the drawings, the embodiments of the present application provide a cooling device 100, which comprises a cold plate 110. It should be noted that the cold plate 110 can be located below a power battery module comprising a plurality of batteries in a vehicle, and the cold plate 110 can cool the power battery module when refrigerant flows into the cold plate 110, so as to cool the batteries in time.

[0044] The cold plate 110 is provided with a first flow channel group 120, a second flow channel group 130 and a converging flow channel 140, and the first flow channel group 120 and the second flow channel group 130 are symmetrical about the median line 141 of the converging flow channel 140. It should be noted that the first flow channel group 120, the second flow channel group 130 and the converging flow channel 140 are all used to provide a flow passage for the refrigerant. If the cold plate 110 is a regular shape, for example Figure 1 The median line 141 of the converging flow channel 140 can be the axis of symmetry of the rectangle. Since the first flow channel group 120 and the second flow channel group 130 are symmetrically arranged, the temperatures of the first flow channel group 120 and the second flow channel group 130 can be kept consistent, and the uniformity of the temperature of the cold plate 110 can be improved.

[0045] The first flow channel group 120 includes a plurality of first flow channels 121 in the shape of n, and the plurality of first flow channels 121 are distributed at intervals, and one of the two adjacent first flow channels 121 is arranged around the other first flow channel 121. It should be noted that one of the two adjacent first flow channels 121 is arranged around the other first flow channel 121 refers to that one of the two adjacent first flow channels 121 is arranged around the outside of the other first flow channel 121.

[0046] The second flow channel group 130 includes a plurality of second flow channels 131 in the shape of n, and the plurality of second flow channels 131 are distributed at intervals, and one of the two adjacent second flow channels 131 is arranged around the other second flow channel 131. It should be noted that one of the two adjacent second flow channels 131 is arranged around the other second flow channel 131 refers to that one of the two adjacent second flow channels 131 is arranged around the outside of the other second flow channel 131. In this way, since each first flow channel 121 and second flow channel 131 does not need to be secondarily graded, the cooling device 100 can more uniformly cool the power battery module, and the cooling effect on the battery is improved. It should be noted that Figure 1 The arrow in the middle indicates the flow direction of the refrigerant in one of the plurality of first flow channels 121 and the flow direction of the refrigerant in one of the plurality of second flow channels 131.

[0047] The midpoint of the converging flow channel 140 is provided with a liquid outlet, and the liquid outlets of the plurality of first flow channels 121 and the liquid outlets of the plurality of second flow channels 131 are respectively communicated with the converging flow channel 140, so that the refrigerant in the first flow channel 121 and the refrigerant in the second flow channel 131 can all flow out from the liquid outlet of the converging flow channel 140 to the outside of the cold plate 110 to complete the cooling process.

[0048] The details and effects of the cooling device provided by the embodiments of the present application will be described in more detail. Figures 1 to 4 The details and effects of the cooling device provided by the embodiments of the present application will be described in more detail.

[0049] As shown in Figure 3 some embodiments, the converging flow channel 140 includes a first portion 142 and a second portion 143, which are respectively located on both sides of the liquid outlet of the converging flow channel 140, and the length of the first portion 142 is the same as that of the second portion 143. The liquid outlets of the plurality of first flow channels 121 are respectively communicated with the first portion 142. The liquid outlets of the plurality of second flow channels 131 are respectively communicated with the second portion 143. It can be understood that the symmetrical shape of the converging flow channel 140 can further improve the uniformity of the temperature of the cold plate 110, ensure that the power battery module can be cooled more uniformly, and improve the cooling effect.

[0050] As shown in Figure 1 and Figure 2 some embodiments, the cooling device 100 further includes a distributor 200 and a plurality of capillary tubes 300. The liquid inlets of the capillary tubes 300 are communicated with the liquid outlets of the distributor 200, and the liquid outlets of the capillary tubes 300 are communicated with the liquid inlets of the corresponding first flow channels 121 or the liquid inlets of the corresponding second flow channels 131. It should be noted that by arranging the distributor 200, the refrigerant flowing to the cold plate 110 can be quickly divided and distributed into each corresponding flow channel. The cooperation of the distributor 200 and the capillary tube 300 can have a pressure reduction effect on the refrigerant, further reducing the temperature of the refrigerant, so that the temperature of the refrigerant entering the cold plate 110 is lower, which can more quickly reduce the temperature of the cold plate 110, thereby improving the cooling efficiency of the power battery module. In some embodiments, the capillary tube 300 can be a copper tube or an aluminum tube with an inner diameter of 1mm to 2mm.

[0051] As shown in Figure 1As shown, in some embodiments, the distance between the inlet of the first flow channel 121 or the inlet of the second flow channel 131 and the outlet of the merging flow channel 140 is negatively correlated with the length of the corresponding capillary tube 300. It is to be noted that the distance between the inlet of the first flow channel 121 or the inlet of the second flow channel 131 and the outlet of the merging flow channel 140 refers to the distance that the refrigerant flows from the inlet of the corresponding flow channel into the first flow channel 121 or the second flow channel 131, and then flows out from the outlet of each flow channel and reaches the outlet of the merging flow channel 140, i.e. the path length of the refrigerant flowing from the inlet of each flow channel to the outlet of the merging flow channel 140. The longer the path length, the shorter the length of the capillary tube 300; the shorter the path length, the longer the length of the capillary tube 300. It is to be noted that the refrigerant in the capillary tube 300 will cause a pressure drop due to friction with the inner wall of the capillary tube 300, causing the liquid refrigerant to evaporate into a gas-liquid mixture. If the length of the capillary tube 300 is longer, it will cause more gas and less liquid, so the liquid flow of the refrigerant flowing into the corresponding first flow channel 121 or second flow channel 131 will be affected by the length of the capillary tube 300 and will decrease, i.e. the flow of the refrigerant will decrease with the increase of the length of the capillary tube 300. Then, by setting the length of the capillary tube 300 in the above manner, the refrigerant flow distributed to the flow channel with a long path length will be greater than the refrigerant flow distributed to the flow channel with a short path length. Thus, the refrigerant flow is reasonably distributed according to the path length of the cooling flow channel to avoid the refrigerant in the flow channel with a short path length from being wasted by having too much unevaporated liquid when reaching the outlet, and to avoid the refrigerant in the flow channel with a long path length from being overheated by evaporating too early before reaching the outlet, thereby affecting the cooling effect.

[0052] In combination Figure 1As shown, in some embodiments, the distance between the inlet of the first flow channel 121 or the inlet of the second flow channel 131 and the outlet of the merging flow channel 140 is positively correlated with the inner diameter of the capillary tube 300. It should be noted that the distance between the inlet of the first flow channel 121 or the inlet of the second flow channel 131 and the outlet of the merging flow channel 140 refers to the distance that the refrigerant flows from the inlet of the corresponding flow channel into the first flow channel 121 or the second flow channel 131, and then flows out from the outlet of each flow channel and reaches the outlet of the merging flow channel 140, that is, the path length of the refrigerant from the inlet of each flow channel to the outlet of the merging flow channel 140. The longer the path length, the larger the inner diameter of the capillary tube 300; the shorter the path length, the smaller the inner diameter of the capillary tube 300. It should be noted that the larger the inner diameter of the capillary tube 300, the more the flow of refrigerant allowed to pass through, and thus the larger the corresponding refrigerant flow, that is, the flow of refrigerant increases with the increase of the inner diameter of the capillary tube 300. Then, by setting the inner diameter of the capillary tube 300 in the above manner, the refrigerant flow distributed to the flow channel with a long path length is greater than the refrigerant flow in the flow channel with a short path length. Thus, the refrigerant flow is reasonably distributed according to the path length of the cooling flow channel to avoid the refrigerant in the flow channel with a short path from having too much unevaporated liquid when reaching the outlet, which is a waste, and to avoid the refrigerant in the flow channel with a long path from evaporating completely too early before reaching the outlet, which is overheating and affects the cooling effect. It should be noted that the length and the inner diameter of the capillary tube 300 can be further adjusted according to the test results of the cooling device 100.

[0053] In some embodiments, the temperature change value of the refrigerant in each first flow channel 121 is a first change value, and the temperature change value of the refrigerant in each second flow channel 131 is a second change value, wherein the first change value is equal to the second change value. It should be noted that the temperature change value refers to the temperature difference between the temperature when the refrigerant enters the inlet of the flow channel and the temperature when the refrigerant flows out of the outlet of the same flow channel. In the embodiments of the present application, the length of the capillary tube 300 or the inner diameter of the capillary tube 300 is matched with different flow channels in the above manner to adjust the refrigerant flow into different flow channels, which can achieve the effect of the same temperature change value in each flow channel. That is, by using capillary tubes 300 of different lengths or inner diameters, the corresponding flow can be reasonably distributed for each flow channel to achieve the same temperature change value, so that the temperature of the cold plate 110 is more uniform, and thus the cold plate 110 with uniform temperature can cool the battery more uniformly, improving the cooling effect on the power battery module.

[0054] In combination with Figure 1 and Figure 2As shown, in some embodiments, the distributor 200 has an inlet channel 210 and multiple outlet channels 220. The inlet of the inlet channel 210 is adapted to be connected to an inlet pipe, and the outlet of the inlet channel 210 is connected to the inlet of each outlet channel 220. The outlet of the outlet channel 220 is connected to the inlet of the corresponding capillary tube 300. This allows the refrigerant entering the distributor 200 to be rapidly distributed into different capillary tubes 300, thereby utilizing capillary tubes 300 of different lengths or inner diameters to rationally distribute the flow rate to different flow channels. It can be understood that the outlet channels 220 and capillary tubes 300 correspond one-to-one with the cooling flow channels, which are either the first flow channel 121 or the second flow channel 131.

[0055] like Figure 2 As shown, in some embodiments, the distance between the liquid inlet of the first flow channel 121 or the liquid inlet of the second flow channel 131 and the liquid outlet of the confluence flow channel 140 is positively correlated with the inner diameter of the corresponding liquid outlet channel 220. That is, the longer the cooling flow channel path, the larger the inner diameter of the liquid outlet channel 220, allowing more liquid refrigerant to flow in; conversely, the shorter the cooling flow channel path, the smaller the inner diameter of the liquid outlet channel 220, allowing less liquid refrigerant to flow in. This allows for a larger flow rate of refrigerant to be allocated to longer cooling flow channels and a smaller flow rate to be allocated to shorter cooling flow channels, ensuring that sufficient and appropriate amounts of refrigerant flow into each channel, and ensuring that the temperature change value is the same in each channel.

[0056] like Figure 2 As shown, in some embodiments, multiple liquid outlet channels 220 are evenly distributed circumferentially along the liquid inlet channel 210. This allows refrigerant entering from the liquid inlet channel 210 to flow more efficiently into each liquid outlet channel 220 along the circumference of the liquid inlet channel 210, and then into the corresponding flow channel from the corresponding capillary 300.

[0057] like Figure 2 As shown, in some embodiments, the axis of the distributor 200 is parallel to the direction of gravity. It is understood that, in the direction of gravity, the inlet channel 210 is located above the outlet channel 220, allowing the refrigerant to flow downwards from the inlet channel 210. It should be noted that during flow, the refrigerant is easily converted into a gaseous state due to friction or pressure changes; therefore, the refrigerant flowing to the distributor 200 usually contains some gas. The distributor 200, positioned along the direction of gravity, ensures that the liquid refrigerant flows into the distributor 200 under gravity, while making it difficult for gaseous refrigerant to enter. In other words, it ensures that the refrigerant can enter the inlet channel 210 of the distributor 200 in liquid form, allowing the refrigerant to enter the corresponding flow channel more evenly and stably, thus achieving efficient cooling.

[0058] likeFigure 2 As shown in some embodiments, the axial direction of the liquid inlet channel 210 of the distributor 200 is parallel to the direction of gravity, and the axial direction of the liquid outlet channel 220 can be at a preset angle with the direction of gravity, wherein the distance between the liquid outlet of the liquid outlet channel 220 and the axis of the distributor 200 is greater than the distance between the liquid inlet of the liquid outlet channel 220 and the axis of the distributor 200. It can be understood that the liquid outlet channel 220 at a preset angle with the direction of gravity can still make the refrigerant flow downward as a whole, thereby ensuring that the refrigerant can enter the capillary tube 300 in a liquid state. It should be noted that, by arranging the liquid outlet channel 220 in the above manner, the liquid outlets of the plurality of liquid outlet channels 220 can be avoided from being too concentrated, thereby reserving sufficient space for the installation of the plurality of capillary tubes 300, and avoiding that the plurality of capillary tubes 300 are too concentrated to affect the stability of the connection between the capillary tubes 300 and the liquid outlets of the liquid outlet channels 220.

[0059] As shown in some embodiments, the two ends of the capillary tube 300 are respectively welded to the liquid outlet end of the corresponding liquid outlet channel 220 and the liquid inlet end of the corresponding first flow channel 121 or the liquid inlet end of the corresponding second flow channel 131, so that the two ends of the capillary tube 300 can be respectively communicated with the corresponding liquid outlet channel 220 and the cooling flow channel. The welding connection mode can ensure the stability of the connection between the capillary tube 300 and the distributor 200 and the cooling plate 110. Figure 1 As shown in some embodiments, the two ends of the capillary tube 300 are respectively clamped to the liquid outlet end of the corresponding liquid outlet channel 220 and the liquid inlet end of the corresponding first flow channel 121 or the liquid inlet end of the corresponding second flow channel 131, so that the two ends of the capillary tube 300 can be respectively communicated with the corresponding liquid outlet channel 220 and the cooling flow channel. The clamping connection mode is more convenient for assembling or disassembling the capillary tube 300, thereby improving the assembly or replacement efficiency when the capillary tube 300 needs to be replaced or assembled, and also ensuring that the structure connected with the capillary tube 300 is not easily damaged during disassembly, thereby reducing the maintenance cost of the replacement or assembly process.

[0060] Figure 1 As shown in some embodiments, the two ends of the capillary tube 300 are respectively clamped to the liquid outlet end of the corresponding liquid outlet channel 220 and the liquid inlet end of the corresponding first flow channel 121 or the liquid inlet end of the corresponding second flow channel 131, so that the two ends of the capillary tube 300 can be respectively communicated with the corresponding liquid outlet channel 220 and the cooling flow channel. The clamping connection mode is more convenient for assembling or disassembling the capillary tube 300, thereby improving the assembly or replacement efficiency when the capillary tube 300 needs to be replaced or assembled, and also ensuring that the structure connected with the capillary tube 300 is not easily damaged during disassembly, thereby reducing the maintenance cost of the replacement or assembly process.

[0061] As shown in some embodiments, the two ends of the capillary tube 300 are respectively clamped to the liquid outlet end of the corresponding liquid outlet channel 220 and the liquid inlet end of the corresponding first flow channel 121 or the liquid inlet end of the corresponding second flow channel 131, so that the two ends of the capillary tube 300 can be respectively communicated with the corresponding liquid outlet channel 220 and the cooling flow channel. The clamping connection mode is more convenient for assembling or disassembling the capillary tube 300, thereby improving the assembly or replacement efficiency when the capillary tube 300 needs to be replaced or assembled, and also ensuring that the structure connected with the capillary tube 300 is not easily damaged during disassembly, thereby reducing the maintenance cost of the replacement or assembly process. Figure 3 ​As shown, in some embodiments, each first flow channel 121 comprises a first sub-flow channel 122, a second sub-flow channel 123 and a third sub-flow channel 124 connected in sequence. The two ends of the second sub-flow channel 123 form an angle with the connection of the first sub-flow channel 122 and the third sub-flow channel 124, respectively. The first sub-flow channel 122 is parallel to the third sub-flow channel 124, and the second sub-flow channel 123 is perpendicular to the first sub-flow channel 122 and the second sub-flow channel 123, respectively, wherein the distance between the first sub-flow channel 122 and the median line 141 of the converging flow channel 140 is less than the distance between the second sub-flow channel 123 and the median line 141 of the converging flow channel 140. The spacing between the plurality of first sub-flow channels 122 in the plurality of first flow channels 121 is less than the spacing between the plurality of third sub-flow channels 124 in the plurality of first flow channels 121. It can be understood that the power battery module includes a plurality of batteries arranged side by side in the length direction of the cold plate 110 and the width direction of the cold plate 110. Generally, the temperature of the battery close to the center of the power battery module is higher, and the temperature of the battery located on the outside of the power battery module is lower than the temperature of the battery located in the center. According to the above manner of arranging the plurality of first flow channels 121, the arrangement of the plurality of first sub-flow channels 122 opposite to the center of the power battery module can be more compact, thereby greatly improving the cooling effect on the battery close to the center, and further improving the cooling effect on the entire power battery module.

[0062] It should be noted that the composition of the second flow channel 131 and the arrangement of the plurality of second flow channels 131 are the same as the composition of the first flow channel 121 and the arrangement of the plurality of first flow channels 121. For details, please refer to the above description of the composition and arrangement of the first flow channel 121, which will not be repeated here.

[0063] As can be seen from the above, by using the cooling device 100 provided in the embodiments of the present application, the cooperation of the distributor 200 and the capillary tube 300 can reasonably distribute the corresponding refrigerant flow to the cooling flow channels with different path lengths, thereby achieving effective cooling and improving the uniformity of the temperature of the cold plate 110, and further improving the cooling effect on the power battery module.

[0064] In combination Figures 1 to 4 As shown, in the second aspect, the embodiments of the present application also provide a cooling system, which comprises the cooling device 100 according to any one of the above first aspects. It should be noted that the composition and corresponding functions of the cooling device 100 in the cooling system are the same as those of the cooling device 100 in the above embodiments of the present application, and therefore will not be repeated here. It should be understood that the above cooling device 100 can improve the uniformity of the temperature of the cold plate 110, and further improve the cooling effect on the power battery module, so that the cooling system installed with the cooling device 100 can improve the cooling effect on the power battery module.

[0065] In some embodiments, the cooling system further comprises a compressor 400, a condenser 500, a passenger cabin evaporator 600, a first expansion valve 700 and a second expansion valve 800. It should be noted that the refrigerant can flow through the above-mentioned devices constituting the cooling system and the pipelines connecting the various components. The compressor 400 is connected to the condenser 500 through a pipeline. The condenser 500 is connected to the first expansion valve 700 and the second expansion valve 800 through a pipeline, respectively, and the first expansion valve 700 and the second expansion valve 800 are connected in parallel. The refrigerant flowing out of the first expansion valve 700 can flow into the compressor 400 and into the passenger cabin, respectively, after passing through the passenger cabin evaporator 600 connected to the first expansion valve 700, so as to cool the passenger cabin and make the passengers feel cool and comfortable. The second expansion valve 800 is connected to the cooling device 100 through a pipeline, for example, the second expansion valve 800 is connected to the liquid inlet of the liquid inlet channel 210 of the distributor 200 in the cooling device 100, and the refrigerant successively passes through the distributor 200 and the capillary tube 300 to enter the corresponding cooling flow channel in the cold plate 110. The liquid outlet of the converging flow channel 140 is connected to the compressor 400 through a pipeline, and then the refrigerant flowing out of the liquid outlet of the converging flow channel 140 can flow into the compressor 400. It should be understood that the compressor 400 driven by the engine of the vehicle is used to extract the gaseous refrigerant from the evaporator and press it into the condenser 500. Then the high-pressure gaseous refrigerant is liquefied after the condenser 500 to exchange heat. The low-pressure liquid refrigerant is depressurized by the throttling action of the expansion valve, and the low-pressure liquid refrigerant is vaporized in the passenger cabin evaporator 600 or flows in the cooling device 100 to exchange heat, so that the refrigerant can cool the passenger cabin and cool the battery.

[0066] In a third aspect, the embodiments of the present application also provide a vehicle comprising the cooling device 100 according to any one of the first aspect or the cooling system according to any one of the second aspect. It should be noted that the cooling device 100 or the cooling system in the cooling system is the same as the composition and corresponding functions of the cooling device 100 or the cooling system provided by the embodiments of the present application, and therefore the embodiments of the present application will not be described here. It can be understood that the vehicle installed with the above-mentioned cooling device 100 or cooling system can realize uniform cooling of the power battery module, that is, greatly improve the cooling effect of the power battery module.

[0067] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope of the application being indicated by the following claims.

[0068] It is to be understood that the application is not limited to the precise construction herein described and illustrated in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. Cooling device, characterized in that The cooling device comprises a cold plate (110), a distributor (200) and a plurality of capillary tubes (300); The cold plate (110) is provided with a first flow channel group (120), a second flow channel group (130) and a confluence flow channel (140), the first flow channel group (120) and the second flow channel group (130) are symmetrical about the median line (141) of the confluence flow channel (140); The first flow channel group (120) comprises a plurality of first flow channels (121) in n-type, a plurality of the first flow channels (121) are distributed at intervals, one of the first flow channels (121) in adjacent two first flow channels (121) is arranged around the other first flow channel (121); The second flow channel group (130) comprises a plurality of second flow channels (131) in n-type, a plurality of the second flow channels (131) are distributed at intervals, one of the second flow channels (131) in adjacent two second flow channels (131) is arranged around the other second flow channel (131); The midpoint of the confluence flow channel (140) is provided with a liquid outlet, the liquid outlets of a plurality of the first flow channels (121) and a plurality of the second flow channels (131) respectively communicate with the confluence flow channel (140); The liquid inlet of the capillary tube (300) communicates with the liquid outlet of the distributor (200), the liquid outlet of the capillary tube (300) communicates with the liquid inlet of the corresponding first flow channel (121) or the liquid inlet of the corresponding second flow channel (131); the distance between the liquid inlet of the first flow channel (121) or the liquid inlet of the second flow channel (131) and the liquid outlet of the confluence flow channel (140) is negatively correlated with the length of the corresponding capillary tube (300), wherein the longer the distance is, the shorter the length of the capillary tube (300) is; the shorter the distance is, the longer the length of the capillary tube (300) is.

2. Cooling device according to claim 1, characterized in that The confluence flow channel (140) comprises a first part (142) and a second part (143), the first part (142) and the second part (143) are located on the two sides of the liquid outlet of the confluence flow channel (140) respectively, the length of the first part (142) is the same as the length of the second part (143); The liquid outlets of a plurality of the first flow channels (121) respectively communicate with the first part (142); The liquid outlets of a plurality of the second flow channels (131) respectively communicate with the second part (143).

3. The cooling device of claim 1, wherein The distance between the liquid inlet of the first flow channel (121) or the liquid inlet of the second flow channel (131) and the liquid outlet of the confluence flow channel (140) is positively correlated with the inner diameter of the capillary tube (300).

4. The cooling device of claim 1, wherein The distributor (200) has a liquid inlet channel (210) and a plurality of liquid outlet channels (220); The liquid inlet of the liquid inlet channel (210) is adapted to communicate with a liquid inlet pipe, the liquid outlet of the liquid inlet channel (210) respectively communicates with the liquid inlet of each liquid outlet channel (220); The liquid outlet of the liquid outlet channel (220) communicates with the liquid inlet of the corresponding capillary tube (300).

5. Cooling device according to claim 4, characterized in that A plurality of the liquid outlet channels (220) are uniformly distributed along the circumference of the liquid inlet channel (210).

6. Cooling device according to claim 4, characterized in that The axial direction of the distributor (200) is parallel to the direction of gravity.

7. A cooling system characterized by, The cooling system comprises a cooling device according to any one of claims 1 to 6.

8. A vehicle characterized by comprising: The vehicle comprises a cooling device according to any one of claims 1 to 6 or a cooling system according to claim 7.

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