Secondary bionic vein-shaped micro-channel cooling plate

Abstract

The utility model relates to a secondary bionic vein-shaped micro-channel cooling plate which comprises a plate body, a central main channel is arranged at the central position in the plate body, and an outlet auxiliary channel connected with the central main channel is respectively arranged at the edges of the two sides of the plate body; a plurality of first-stage bionic vein-shaped small channels are arranged between the central main channel and the two outlet auxiliary channels; and a plurality of second-stage bionic vein-shaped micro-channels are arranged on the two sides of each first-stage bionic vein-shaped small channel. Under the condition of not additionally increasing the conveying power consumption of fluid in a flow channel, the high-temperature area of a heat source center can be rapidly cooled, the temperature field in the plate body can be highly homogenized, the temperature uniformity of the cooled power battery is improved, and compared with a conventional liquid cooling plate, the cooling plate has the advantages of being simple in structure and convenient to use. And the highest temperature of the power battery and the battery tabs can be reduced, and the temperature difference between the two tabs of the battery is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of coolers, and in particular relates to a secondary bionic leaf vein-shaped micro-channel cooling plate. Background Art

[0002] With the rapid development of high-power and high-integration electronic components, various high-current, high-speed, high-power density electronic components such as resistors, transistors, high-power integrated circuits, etc. continue to emerge. These high-power power electronic components generate more and more heat during operation, resulting in the continuous rise in the temperature of the electronic components. If the heat is not dissipated in time, it will cause the electronic components to fail or be damaged. Moreover, it is necessary to ensure the temperature uniformity of the power electronic components to avoid the occurrence of nodes with too high temperature in order to ensure the stability of the device operation.

[0003] In addition, in the field of thermal management of power batteries in new energy vehicles, on the one hand, the power batteries need to be cooled in a high-temperature environment, and on the other hand, the power batteries need to be heated in a low-temperature environment to ensure that the power batteries always work in a suitable temperature range. Similarly, the surface temperature of the power batteries being cooled or heated must be uniform to avoid cumulative thermal runaway events caused by excessive temperature at a certain local point.

[0004] At present, in terms of heat dissipation of high-power electronic components or heating and heat dissipation of power batteries, heat transfer through heat conducting plates is a good heat transfer method. In order to increase the effect of heat transfer, liquid flow channels are generally chiseled in the heat conducting plates, and the purpose of heat dissipation and heating is achieved by the inflow and outflow of liquids at different temperature levels. That is, when the temperature of electronic components or power batteries is too low, the liquid is heated, the heat conducting plate is heated by convection heat transfer, and then the heat is transferred to the heated object by heat conduction; when the temperature of electronic components or power batteries is too high, a lower temperature liquid (usually close to the ambient temperature) is used to flow through the heat conducting plate, and the heat of the high-temperature device is continuously transferred to the heat conducting plate by heat conduction, and then transferred to the lower temperature fluid to take the heat away.

[0005] There are many forms of internal flow channel structures of cooling plates, including series, parallel, and series-parallel combinations. However, most current cooling plates have problems with uneven internal flow distribution, and even local liquid reflux inside the cooler, which often leads to poor heat dissipation in local areas of the flow channel, resulting in inconsistent cooling capacities in different parts of the cooling plate, making it difficult to achieve the goal of uniform heat dissipation.

[0006] In ecological botany, the leaves of plants have evolved over a long period of time to transport water and nutrients perfectly. Figure 4As shown in the figure, the scale distribution of the fluid transport channels at each level is reasonable, and it relies on its own nearly perfect adaptive structure to resist the influence of high and low temperatures on its normal physiological activities, and obtains lower energy consumption with less structural cost. Its fluid transport and heat dissipation mechanism has a good reference significance for the design of the internal flow channel structure of the cooling plate.

[0007] Invention patent CN202110715828.5 discloses a leaf vein bionic microchannel coupled jet heat exchange system, including a cover plate, a jet plate and a microchannel plate which are stacked and connected in sequence; through the bionic plant vein network structure, the uniformity of the distribution of the fluid in the jet plate is improved, so that the fluid can quickly and evenly enter and discharge the jet plate, thereby improving the overall cooling and temperature equalization effect of the heat exchange system. However, the improvement of its heat dissipation capacity depends on the liquid working fluid jet, and the fluid flow resistance loss is large, and a larger pressure head needs to be applied to the fluid entering the jet plate, which requires the heat exchange system to consume more energy.

[0008] The utility model authorized patent CN219892241U discloses a bionic liquid cooling device for balanced heat dissipation of lithium-ion batteries, including a lithium-ion power battery, a heat conducting plate and a liquid cooling plate, wherein the liquid cooling plate includes a top plate and a bottom plate, and a flow channel is designed on the bottom plate, which is composed of a liquid inlet, a liquid outlet, a liquid inlet channel, a liquid outlet channel and a plurality of tributary channels, and the tributary channels are similar to the bifurcated structure of tree branches and leaf veins; the liquid cooling plate with the bionic topological structure of tree branches and leaf veins can indeed distribute the flow more evenly on each tributary channel, however, since the liquid inlet is located on one side of its upper part and the liquid outlet is located on one side of its lower part, on the one hand, the temperature of the power battery in the area near the liquid inlet is lower, while the temperature of the power battery in the area near the liquid outlet is higher, and the characteristic that the temperature of the central area of ​​the power battery is higher under normal circumstances is not taken into account; on the other hand, since the power battery's pole ear releases huge heat, the arrangement of its liquid inlet on one side of the upper part will weaken the heat dissipation of the power battery pole ear on the other side, resulting in that the temperature difference of the entire power battery still has room for decline.

[0009] Based on this, the present application provides a secondary bionic leaf vein-shaped micro-channel cooling plate. Utility Model Content

[0010] The purpose of the utility model is to provide a secondary bionic leaf vein-shaped micro-channel cooling plate in order to solve the above problems.

[0011] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0012] A secondary bionic leaf vein-shaped micro-channel cooling plate comprises a plate body, wherein a central main channel is provided at the central part of the plate body, and an outlet secondary channel connected to the central main channel is provided at the edges of both sides;

[0013] A plurality of primary bionic leaf vein-shaped small channels are provided between the central main channel and the two outlet secondary channels;

[0014] A plurality of secondary bionic leaf vein-shaped microchannels are arranged on both sides of each of the primary bionic leaf vein-shaped small channels;

[0015] At least one secondary converging microchannel is arranged between every two adjacent primary bionic leaf vein-shaped small channels, and intersects and penetrates the secondary bionic leaf vein-shaped microchannel.

[0016] As a further optimization scheme of the utility model, the plate body includes a heat conduction plate body one and a heat conduction plate body two which are connected to each other, and the central main channel, the outlet sub-channel, the first-level bionic leaf vein-shaped small channel, the second-level bionic leaf vein-shaped microchannel, and the second-level converging microchannel are opened on the heat conduction plate body one or the heat conduction plate body two.

[0017] As a further optimization solution of the utility model, the secondary converging microchannel and the primary bionic leaf vein-shaped small channel are parallel to each other.

[0018] As a further optimization scheme of the utility model, the central main channel, the outlet secondary channel, the first-level bionic leaf vein-shaped small channel, the second-level bionic leaf vein-shaped microchannel, and the second-level converging microchannel are all of the same height;

[0019] Viewed along the discharge direction, the width of the central main channel is reduced, with a taper ratio of 0.75-0.95;

[0020] Viewed along the discharge direction, the width of the outlet secondary channel is gradually expanded, and the expansion ratio is 1.05-1.25;

[0021] The upstream of the central main channel is a fluid inlet, and the downstream of each outlet sub-channel is a fluid outlet;

[0022] The width of the fluid inlet on the central main channel is 1.5-2.5 times the width of the fluid outlet on the outlet secondary channel;

[0023] The width of the outlet secondary channel is 8-12 times the width of the secondary bionic leaf vein-shaped microchannel;

[0024] The width of the primary bionic leaf vein-shaped small channel is 5-10 times the width of the secondary bionic leaf vein-shaped microchannel;

[0025] The width of the secondary confluence microchannel is 2-3 times the width of the secondary bionic leaf vein-shaped microchannel;

[0026] The width of the secondary bionic leaf vein-shaped microchannel ranges from 0.2 mm to 1 mm.

[0027] As a further optimization solution of the utility model, the angle between the primary bionic leaf vein-shaped small channel and the central main channel ranges from 30 to 90 degrees.

[0028] As a further optimization scheme of the present utility model, the angle between the secondary bionic leaf vein-shaped microchannel and its corresponding primary bionic leaf vein-shaped small channel ranges from 30 to 90 degrees.

[0029] The beneficial effects of the utility model are:

[0030] 1) The utility model can realize rapid cooling of the high-temperature area in the center of the heat source without additionally increasing the power consumption of the fluid in the flow channel, and can also realize a high degree of uniformity of the temperature field in the plate body, thereby improving the temperature uniformity of the cooled power battery. Compared with conventional liquid cooling plates, the utility model (the authorized utility model patent with patent number CN219892241U) can also reduce the maximum temperature of the power battery and the battery tabs, and reduce the temperature difference between the two tabs of the battery;

[0031] 2) The utility model designs the central main channel in the middle of the plate body, and quickly introduces the cold fluid into the central part of the object to be cooled, first cooling the high-temperature area in the center of the heat source. At the same time, this design places the two pole ears at the upper end of the power battery in symmetrical positions on both sides of the central main channel, which is also conducive to achieving the maximum and equal degree of cooling of the two power battery pole ears. Then, through the design of connecting the central main channel with the outlet secondary channel and the first-level bionic leaf vein-shaped small channel in parallel, the fluid is uniformly diffused in the entire plate body, avoiding the disadvantages of small flow rate and low heat dissipation capacity in local areas, and achieving the purpose of uniform heat dissipation of the heat source;

[0032] 3) The utility model adopts the design of a secondary bionic leaf vein-like microchannel to connect two adjacent primary bionic leaf vein-like small channels in a through-type manner, so that the flow of liquid in the primary bionic leaf vein-like small channel is more uniform, and the backflow of liquid in the local primary bionic leaf vein-like small channel is avoided, which significantly enhances the temperature uniformity of the cooling plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is an exploded schematic diagram of the overall structure of the utility model.

[0034] Figure 2 It is a structural schematic diagram of the second heat conducting plate body of the utility model.

[0035] Figure 3 It is a battery temperature cloud diagram of heat dissipation of power batteries by a conventional liquid cooling plate (liquid cooling plate structure with patent number CN219892241U) and the cooling plate of the present application.

[0036] Figure 4 It is a diagram of the meridian-like flow channels in plant leaves.

[0037] In the figure: 1. Thermal conduction plate body 1; 2. Thermal conduction plate body 2; 21. Central main channel; 21a. Fluid inlet; 22. Outlet sub-channel; 22b. Fluid outlet; 23. Primary bionic leaf vein-shaped small channel; 24. Secondary bionic leaf vein-shaped microchannel; 25. Secondary converging microchannel. DETAILED DESCRIPTION

[0038] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0039] like Figure 1-3 As shown, a secondary bionic leaf vein-shaped micro-channel cooling plate comprises a plate body, wherein a central main channel 21 is provided at the central part of the plate body, and an outlet secondary channel 22 connected to the central main channel 21 is provided at the edges of both sides;

[0040] A plurality of primary bionic leaf vein-shaped small channels 23 are provided between the central main channel 21 and the two outlet secondary channels 22;

[0041] A plurality of secondary bionic leaf vein-shaped microchannels 24 are provided on both sides of each of the primary bionic leaf vein-shaped small channels 23;

[0042] At least one secondary converging microchannel 25 is disposed between every two adjacent primary bionic leaf vein-shaped small channels 23 , and intersects and penetrates the secondary bionic leaf vein-shaped microchannel 24 .

[0043] In this embodiment, the plate body includes a heat conduction plate body 1 and a heat conduction plate body 2 which are connected to each other, and the central main channel 21, the outlet sub-channel 22, the first-level bionic leaf vein-shaped small channel 23, the second-level bionic leaf vein-shaped microchannel 24, and the second-level converging microchannel 25 are opened on the heat conduction plate body 1 or the heat conduction plate body 2 2.

[0044] It should be noted that, in this embodiment, the thermal conductive plate body 1 and the thermal conductive plate body 2 are sealed and connected by screws, adhesives, etc.

[0045] Preferably, the secondary converging microchannel 25 and the primary bionic leaf vein-shaped small channel 23 are parallel to each other.

[0046] Preferably, the central main channel 21, the outlet secondary channel 22, the primary bionic leaf vein-shaped small channel 23, the secondary bionic leaf vein-shaped microchannel 24, and the secondary converging microchannel 25 are all of the same height;

[0047] When viewed along the discharge direction, that is, from the fluid inlet 21a to the fluid outlet 22b, the width of the central main channel 21 is reduced, and the reduction ratio is 0.75-0.95;

[0048] When viewed along the discharge direction, that is, from the fluid inlet 21a to the fluid outlet 22b, the width of the outlet sub-channel 22 is gradually expanded, and the expansion ratio is 1.05-1.25;

[0049] The upstream of the central main channel 21 is a fluid inlet 21a, and the downstream of each outlet sub-channel 22 is a fluid outlet 22b;

[0050] The width of the fluid inlet 21a on the central main channel 21 is 1.5-2.5 times the width of the fluid outlet 22b on the outlet secondary channel 22;

[0051] The width of the outlet secondary channel 22 is 8-12 times the width of the secondary bionic leaf vein-shaped microchannel 24;

[0052] The width of the primary bionic leaf vein-shaped small channel 23 is 5-10 times the width of the secondary bionic leaf vein-shaped microchannel 24;

[0053] The width of the secondary confluence microchannel 25 is 2-3 times the width of the secondary bionic leaf vein-shaped microchannel 24;

[0054] The width of the secondary bionic leaf vein-shaped microchannel 24 ranges from 0.2 mm to 1 mm.

[0055] Preferably, the angle between the primary bionic leaf vein-shaped small channel 23 and the central main channel 21 is in the range of 30-90 degrees.

[0056] Preferably, the angle between the secondary bionic leaf vein-shaped microchannel 24 and its corresponding primary bionic leaf vein-shaped small channel 23 is in the range of 30-90 degrees.

[0057] In actual specific use, such as dissipating heat for soft-pack type power batteries, the plate body can be in close contact with the side wall of the power battery, and the liquid cooling fluid flows in from the fluid inlet 21a of the central main channel 21, and is distributed to the primary bionic leaf vein-shaped small channels 23 on both sides through the central main channel 21, and flows through the secondary bionic leaf vein-shaped microchannels 24, and converges through the secondary converging microchannels 25, and flows out from the fluid outlets 22b of the two outlet sub-channels 22 on both sides of the plate body. The heat generated during the operation of the power battery is quickly transferred to the heat conducting plate body 1 and the heat conducting plate body 2, and then transferred to the flowing cooling liquid, and the heat is released by the flow of the cooling fluid.

[0058] In order to compare the superiority of the cooling plate of the present application, a conventional liquid cooling plate of the same size (i.e., the liquid cooling plate structure of the authorized utility model with patent number CN219892241U) and the cooling plate of the present application were directly in contact with the largest single side of the block power battery, and numerical simulation calculations were performed under the same calculation conditions such as equal working fluid inlet flow, working fluid outlet flow, and the same block power battery heat generation. It should be noted that the conventional liquid cooling plate and the cooling plate of the present invention are only compared in terms of the technical effects brought about by the structural improvements. The cooling plate of the present application used in the experiment,

[0059] A secondary converging microchannel 25 is provided between every two adjacent primary bionic leaf vein-shaped microchannels 23, and intersects and penetrates the secondary bionic leaf vein-shaped microchannel 24;

[0060] The tapering ratio of the central main channel 21 is 0.8;

[0061] The gradual expansion ratio of the outlet secondary channel 22 is 1.2;

[0062] The width of the fluid inlet 21a on the central main channel 21 is twice the width of the fluid outlet 22b on the outlet sub-channel 22;

[0063] The width of the outlet secondary channel 22 is 10 times the width of the secondary bionic leaf vein-shaped microchannel 24;

[0064] The width of the primary bionic leaf vein-shaped small channel 23 is 5 times the width of the secondary bionic leaf vein-shaped microchannel 24;

[0065] The width of the secondary confluence microchannel 25 is twice the width of the secondary bionic leaf vein-shaped microchannel 24;

[0066] The angle between the primary bionic leaf vein-shaped small channel 23 and the central main channel 21, and the angle between the secondary bionic leaf vein-shaped microchannel 24 and its corresponding primary bionic leaf vein-shaped small channel 23 are both 60 degrees;

[0067] Specifically, the width of the fluid outlet 22b on the outlet sub-channel 22 is 10mm; the width of the fluid outlet 22b on the outlet sub-channel 22 is 5mm; the width of the first-level bionic leaf vein-shaped small channel 23 is 2.5mm, which belongs to the small scale range; the width of the second-level bionic leaf vein-shaped microchannel 24 is 0.5mm, which belongs to the micro scale range; the width of the second-level confluence microchannel 25 is 1mm, which is between the micro and small scale transition range.

[0068] like Figure 3As shown, the lowest temperature of the soft-pack power battery cooled by the conventional liquid cooling plate is 28.8°C in the liquid inlet area of ​​the liquid cooling plate; the highest temperature is 32.1°C on the pole ear on the other side of the liquid inlet of the liquid cooling plate; the maximum temperature difference of the entire battery reaches 3.3°C; however, the lowest temperature of the soft-pack power battery cooled by the cooling plate of the present application is 28.0°C near the fluid inlet 21a in the middle of the battery; the highest temperature is also reflected on the pole ear, which is 30.7°C; the maximum temperature difference of the entire battery is only 2.7°C; and the pole ear temperature of the conventional liquid cooling plate is 32.1°C, and the pole ear temperature of the cooling plate of the present application is 30.7°C; the temperature difference between the two pole ears of the conventional liquid cooling plate is 3.2°C, and the temperature difference between the two pole ears of the cooling plate of the present application is only 0.7°C. It can be seen that the design of the cooling plate of the present application further improves the uniformity of the temperature of the entire power battery, reduces the maximum temperature of the power battery and the battery pole ear, and reduces the temperature difference between the two pole ears of the battery.

[0069] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A secondary bionic leaf vein-shaped micro-channel cooling plate, comprising a plate body, characterized in that: A central main channel (21) is provided at the center of the plate body, and an outlet secondary channel (22) connected to the central main channel (21) is provided at the edges of both sides; A plurality of primary bionic leaf vein-shaped small channels (23) are provided between the central main channel (21) and the two outlet secondary channels (22); A plurality of secondary bionic leaf vein-shaped microchannels (24) are provided on both sides of each of the primary bionic leaf vein-shaped small channels (23); At least one secondary converging microchannel (25) is provided between every two adjacent primary bionic leaf vein-shaped small channels (23), and intersects and penetrates the secondary bionic leaf vein-shaped microchannel (24).

2. The secondary bionic leaf vein-shaped micro-channel cooling plate according to claim 1, characterized in that: The plate body comprises a first heat transfer plate body (1) and a second heat transfer plate body (2) which are connected to each other, and the central main channel (21), the outlet secondary channel (22), the first-level bionic leaf vein-shaped small channel (23), the second-level bionic leaf vein-shaped microchannel (24), and the second-level converging microchannel (25) are arranged on the first heat transfer plate body (1) or the second heat transfer plate body (2).

3. The secondary bionic leaf vein-shaped micro-channel cooling plate according to claim 2, characterized in that: The secondary converging microchannel (25) and the primary bionic leaf vein-shaped small channel (23) are parallel to each other.

4. The secondary bionic leaf vein-shaped micro-channel cooling plate according to claim 2, characterized in that: The central main channel (21), the outlet secondary channel (22), the primary bionic leaf vein-shaped small channel (23), the secondary bionic leaf vein-shaped microchannel (24), and the secondary converging microchannel (25) are all of the same height; Viewed along the discharge direction, the width of the central main channel (21) is reduced, with a taper ratio of 0.75-0.95; Viewed along the discharge direction, the width of the outlet secondary channel (22) is gradually expanding, and the expansion ratio is 1.05-1.25; The upstream of the central main channel (21) is a fluid inlet (21a), and the downstream of each outlet sub-channel (22) is a fluid outlet (22b); The width of the fluid inlet (21a) on the central main channel (21) is 1.5-2.5 times the width of the fluid outlet (22b) on the outlet secondary channel (22); The width of the outlet secondary channel (22) is 8-12 times the width of the secondary bionic leaf vein-shaped microchannel (24); The width of the primary bionic leaf vein-shaped small channel (23) is 5-10 times the width of the secondary bionic leaf vein-shaped microchannel (24); The width of the secondary confluence microchannel (25) is 2-3 times the width of the secondary bionic leaf vein-shaped microchannel (24); The width of the secondary bionic leaf vein-shaped microchannel (24) ranges from 0.2 mm to 1 mm.

5. The secondary bionic leaf vein-shaped micro-channel cooling plate according to claim 2, characterized in that: The angle between the primary bionic leaf vein-shaped small channel (23) and the central main channel (21) is in the range of 30-90 degrees.

6. The secondary bionic leaf vein-shaped micro-channel cooling plate according to claim 2, characterized in that: The angle between the secondary bionic leaf vein-shaped microchannel (24) and its corresponding primary bionic leaf vein-shaped small channel (23) is in the range of 30-90 degrees.

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