Fin structure and radiator
By employing a two-layer fin structure in the power module heat sink, with overlapping flow channel holes and altered flow direction, the turbulence intensity is enhanced, solving the problem of large junction temperature differences and achieving a more efficient heat dissipation effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU INOSA UNITED POWER SYST CO LTD
- Filing Date
- 2025-03-27
- Publication Date
- 2026-04-28
AI Technical Summary
In the prior art, the pin-fin structure of power module heat sinks leads to large differences in junction temperature at different locations, affecting heat dissipation efficiency and reliability.
The structure employs at least two fin layers, with the fins stacked and partially overlapping in the flow channel holes of adjacent fin layers. This causes the fluid to change its flow direction as it flows through the fins, thereby increasing the turbulence intensity. The flow channel holes are optimized through a variable cross-section design to improve junction temperature differences.
This effectively reduces the junction temperature difference at different locations of the power module, improves heat dissipation efficiency, reduces temperature rise, and enhances reliability.
Smart Images
Figure CN224178460U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power module heat dissipation technology, and in particular to a finned structure and heat sink. Background Technology
[0002] In the field of new energy vehicles, power modules generate heat loss during operation, especially as power devices are developed towards higher power densities, leading to increased heat loss. This places increasingly stringent requirements on junction temperature control of power modules. Therefore, an efficient heat dissipation and cooling system is crucial for the reliable operation of high-power modules.
[0003] In related technologies, power module heat sinks are mainly of the needle-fin structure. The needles come in various shapes and array sizes, and are distinguished by water channel layout as either horizontal or vertical series, in order to balance heat dissipation and flow resistance. However, series water channels are prone to heat accumulation in the direction of coolant flow, resulting in large differences in junction temperature at different locations of the power module. Utility Model Content
[0004] The main purpose of this invention is to propose a finned structure and heat sink, which aims to improve the problem of large junction temperature differences at different locations of the power module.
[0005] To achieve the above objectives, the fin structure proposed in this utility model includes:
[0006] At least two fins are stacked together. The fins are provided with a plurality of spaced flow channel holes. In two adjacent fins, the flow channel holes of one fin partially overlap with the flow channel holes of the other fin, so that two adjacent flow channel holes of one fin are connected in series through one flow channel hole of the other fin.
[0007] In one embodiment, the cross-section of the flow channel hole is a variable cross-section.
[0008] In one embodiment, the fin has a length direction consistent with the flow direction of the fluid, and the cross-section of the flow channel hole gradually decreases or gradually increases in the length direction of the fin.
[0009] In one embodiment, the flow channel has a small cross-section end and a large cross-section end, wherein the cross-section of the small cross-section end is smaller than the cross-section of the large cross-section end;
[0010] In two adjacent fins, the projection of the larger end of the flow channel hole of one fin onto the smaller end of the flow channel hole of the other fin on one of the fins is overlapping.
[0011] In one embodiment, in two adjacent fin layers, with the surface of the two adjacent fins overlapping each other as the horizontal plane, the projection of one fin onto the other fin is rotated 180 degrees horizontally around the center of the fin and then overlaps with the other fin.
[0012] In one embodiment, in two adjacent fin layers, with the normal direction of the surface of the two adjacent fins overlapping each other as the vertical direction, the projection of one fin onto the other fin is rotated 180 degrees vertically around the central axis of the fin and then overlaps with the other fin.
[0013] In one embodiment, in the same fin, a plurality of flow channel holes form at least two rows of flow channel groups, the at least two rows of flow channel groups are spaced apart along the width direction of the fin, and each row of flow channel groups includes a plurality of flow channel holes spaced apart along the length direction of the fin.
[0014] In one embodiment, the flow channel holes in two adjacent columns of the flow channel group are staggered.
[0015] To achieve the above objectives, this utility model also proposes a radiator, comprising:
[0016] A heat dissipation substrate, the heat dissipation substrate having a mounting surface;
[0017] As described above, the fin structure is located on the mounting surface.
[0018] The technical solution of this utility model employs at least two layers of fins stacked together to form a fin structure. In adjacent fin layers, the flow channel holes of one fin partially overlap with those of the other fin, allowing two adjacent flow channel holes of one fin layer to be connected in series through a single flow channel hole of the other fin layer. When the fluid flows through the flow channel holes, it experiences alternating odd and even layer flow at the overlap of the two flow channel holes of adjacent fin layers, thereby changing the flow direction. This change in flow direction increases the intensity of turbulence within the flow channel holes, reducing the accumulated temperature generated in the series-connected water path along the fluid flow direction. This improves the problem of large junction temperature differences at different locations of the power module. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0020] Figure 1A schematic diagram of the fin structure provided by this utility model during the stacking process;
[0021] Figure 2 A schematic diagram of another embodiment of the fin structure provided by this utility model during the stacking process;
[0022] Figure 3 A schematic diagram of the structure of an embodiment of the fin provided by this utility model;
[0023] Figure 4 A schematic diagram of an embodiment of the fin structure provided by this utility model;
[0024] Figure 5 A schematic diagram of a radiator embodiment provided by this utility model;
[0025] Figure 6 A schematic diagram of the heat dissipation substrate in one embodiment of the heat sink provided by this utility model.
[0026] Explanation of icon numbers:
[0027] label name label name 100 heat sink 1112 Large end of cross section 10 Fin structure 11a Flow channel assembly 11 fins a Length direction 111 Flow channel orifice b Width direction 1111 Small end of cross section 20 Heat sink
[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0030] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0032] In the field of new energy vehicles, power modules generate heat loss during operation, especially as power devices are developed towards higher power densities, leading to increased heat loss. This places increasingly stringent requirements on junction temperature control of power modules. Therefore, an efficient heat dissipation and cooling system is crucial for the reliable operation of high-power modules.
[0033] In related technologies, power module heat sinks are mainly of the needle-fin structure. The needles come in various shapes and array sizes, and are distinguished by water channel layout as either horizontal or vertical series, in order to balance heat dissipation and flow resistance. However, series water channels are prone to heat accumulation in the direction of coolant flow, resulting in large differences in junction temperature at different locations of the power module.
[0034] Based on the above problems, this utility model proposes a fin structure 10, which aims to improve the problem of large junction temperature differences at different locations of the power module.
[0035] Please see Figures 1 to 4 In one embodiment of the present invention, the fin structure 10 includes at least two layers of fins 11, which are stacked together. Each fin 11 has a plurality of spaced flow channel holes 111. In two adjacent layers of fins 11, the flow channel holes 111 of one fin 11 partially overlap with the flow channel holes 111 of the other fin 11, so that two adjacent flow channel holes 111 of one fin 11 are connected in series through one flow channel hole 111 of the other fin 11.
[0036] In this embodiment, the fin 11 is a one-piece heat dissipation structure, which can be a metal sheet that can increase the heat exchange surface area, such as a copper sheet, aluminum sheet, stainless steel sheet, carbon steel sheet, or cast iron sheet. The fin 11 can be formed with a plurality of flow channel holes 111 by stamping. The flow channel holes 111 penetrate the two large surfaces of the fin 11 in the thickness direction. The shape of the flow channel holes 111 can be circular, elliptical, rectangular, trapezoidal, triangular, pentagonal, hexagonal, etc.
[0037] In two adjacent fin layers 11, the flow channel holes 111 of one fin layer 11 partially overlap with the flow channel holes 111 of the other fin layer 11, so that the two flow channel holes 111 form an overlapping area. When the fluid flows through this overlapping area, it can change the flow direction, thereby increasing the turbulence intensity.
[0038] In two adjacent fin layers 11, two adjacent flow channel holes 111 of one fin layer 11 are connected in series through one flow channel hole 111 of the other fin layer 11. It can be understood that the two fin layers 11 are defined as the first fin layer 11 and the second fin layer 11. The fluid first flows through the first flow channel hole 111 of the first fin layer 11, then flows to the first flow channel hole 111 of the second fin layer 11, then flows to the second flow channel hole 111 of the first fin layer 11, then flows to the second flow channel hole 111 of the second fin layer 11, and so on, so as to realize the series flow path.
[0039] In practical applications, the number of stacked layers of fin 11 can be two, three, four, five, or multiple layers, depending on factors such as power module height limitations, heat dissipation requirements, and flow resistance requirements.
[0040] In summary, the technical solution of this utility model employs at least two layers of fins 11 stacked to form a fin structure 10. In adjacent layers of fins 11, the flow channel holes 111 of one layer partially overlap with those of the other layer, allowing two adjacent flow channel holes 111 of one layer to be connected in series through one flow channel hole 111 of the other layer. When the fluid flows through the flow channel holes 111, it experiences alternating odd and even layer flow at the overlap of the two flow channel holes 111 of adjacent layers of fins 11, thereby changing the flow direction. This change in flow direction increases the intensity of turbulence within the flow channel holes 111, reducing the accumulated temperature in the series-connected water path along the fluid flow direction and thus improving the problem of large junction temperature differences at different locations of the power module.
[0041] Please see Figure 1 , Figure 2 In one embodiment of this utility model, the cross-section of the flow channel hole 111 is a variable cross-section.
[0042] This design allows the flow channel hole 111 to have a variable cross-section in the direction of fluid flow. When the fluid flows through the variable cross-section flow channel hole 111, the flow velocity of the fluid will change. The change in fluid velocity can also increase the intensity of turbulence in the flow channel hole 111, thereby further reducing the accumulated temperature generated in the series water circuit in the direction of fluid flow. This further improves the problem of large junction temperature differences at different locations of the power module.
[0043] In practical applications, the variable cross-section of the flow channel hole 111 can be designed in a gradual or abrupt manner, as long as it can change the flow velocity of the fluid.
[0044] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the fin 11 has a length direction a consistent with the flow direction of the fluid, and the cross-section of the flow channel hole 111 gradually decreases or gradually increases along the length direction a of the fin 11.
[0045] In this embodiment, the length direction a of the fin 11 is consistent with the flow direction of the fluid. It can be understood that the cross-section of the flow channel hole 111 gradually decreases or gradually increases in the flow direction of the fluid. That is, the cross-section of the flow channel hole 111 is trapezoidal.
[0046] With this configuration, when the fluid flows through the flow channel hole 111, which has a gradually decreasing or increasing cross-section, the fluid velocity gradually increases or decreases. By gradually changing the fluid velocity, the intensity of turbulence generated in the flow channel hole 111 can be better enhanced.
[0047] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the flow channel hole 111 has a small cross-section end 1111 and a large cross-section end 1112, the cross-section of the small cross-section end 1111 is smaller than the cross-section of the large cross-section end 1112; in two adjacent fins 11, the projection of the large cross-section end 1112 of the flow channel hole 111 of one fin 11 and the small cross-section end 1111 of the flow channel hole 111 of the other fin 11 overlaps on one of the fins 11.
[0048] With this configuration, when the projections of the two smaller ends 1111 of the two flow channel holes 111 onto one of the fins 11 are overlapped, if there is a slight positional shift between the two adjacent fin layers 11, the projections of the two smaller ends 1111 of the two flow channel holes 111 onto one of the fins 11 will not overlap, resulting in the two flow channel holes 111 being unable to connect. Therefore, this solution ensures that the projections of the larger end 1112 of the flow channel hole 111 of one fin layer 11 onto one of the fin layers 11 are overlapped with the projections of the smaller end 1111 of the flow channel hole 111 of the other fin layer 11, even if there is a slight positional shift between the two adjacent fin layers 11, the two flow channel holes 111 can still partially overlap and achieve connection.
[0049] Please see Figure 1 In one embodiment of the present invention, in two adjacent layers of fins 11, with the surface of the two adjacent fins 11 overlapping each other as the horizontal plane, the projection of one fin 11 onto the other fin 11 is rotated 180 degrees horizontally around the center of the fin 11 and then overlaps with the other fin 11.
[0050] With this setup, two identical fins 11 can be stacked. Before stacking, one fin 11 can be rotated 180 degrees horizontally around its center and then stacked on top of the other fin 11. This allows two adjacent flow channel holes 111 of one fin 11 to be connected in series through one flow channel hole 111 of the other fin 11. This way, multiple fins 11 can be produced using only one set of molds, eliminating the need for multiple sets of molds to produce multiple different fins 11, thus reducing production costs.
[0051] Please see Figure 2 In another embodiment of the present invention, in two adjacent fins 11, with the normal direction of the surface of the two adjacent fins 11 overlapping each other as the vertical direction, the projection of one fin 11 onto the other fin 11 is rotated 180 degrees vertically around the central axis of the fin 11 and then overlaps with the other fin 11.
[0052] With this setup, two identical layers of fins 11 can be stacked. Before stacking, one layer of fins 11 can be rotated 180 degrees vertically around its central axis and then stacked on top of the other layer of fins 11. This allows two adjacent flow channel holes 111 of one layer of fins 11 to be connected in series through one flow channel hole 111 of the other layer of fins 11. In this way, multiple fins 11 can be produced using only one set of molds, eliminating the need to use multiple sets of molds to produce multiple different fins 11, thus reducing production costs.
[0053] Please see Figure 1 , Figure 2In one embodiment of the present invention, in the same fin 11, a plurality of flow channel holes 111 form at least two rows of flow channel groups 11a, and the at least two rows of flow channel groups 11a are distributed at intervals along the width direction b of the fin 11. Each row of flow channel groups 11a includes a plurality of flow channel holes 111 distributed at intervals along the length direction a of the fin 11.
[0054] This configuration allows for the array distribution of several flow channel holes 111 in each fin layer 11, enabling the flow channel holes 111 to be set as large as possible. This ensures that when the fluid flows through the flow channel holes 111, it can fully remove the heat from the fins 11 and the power module, thereby improving the heat dissipation effect.
[0055] Please see Figure 1 , Figure 2 In one embodiment of this utility model, the flow channel holes 111 in two adjacent flow channel groups 11a are staggered.
[0056] With this configuration, after two adjacent fins 11 are stacked, it can be effectively ensured that two adjacent flow channel holes 111 of one fin 11 are connected in series through one flow channel hole 111 of the other fin 11.
[0057] Please see Figure 5 and Figure 6 This utility model also proposes a heat sink 100, which includes a heat sink substrate 20 and a fin structure 10. The specific structure of the fin structure 10 is as described in the above embodiments. Since this heat sink 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. Among them, the heat sink substrate 20 has a mounting surface; the fin structure 10 is disposed on the mounting surface.
[0058] Understandably, by mounting the fin structure 10 on the mounting surface of the heat dissipation substrate 20, a heat sink 100 for dissipating heat from the power module is formed. In use, the power module can be mounted on the heat sink 100, and when the fluid flows through the flow channel holes 111 of the fin structure 10, the heat generated by the power module during operation can be carried away.
[0059] In some embodiments, when the heat sink 100 provided by this solution is used to dissipate heat from the power module, the hot spot junction temperature can be reduced to 128.7°C, which is 6°C lower than the traditional high-density elliptical pinfin hot spot junction temperature, representing a temperature rise / fall of 8%.
[0060] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A finned structure, characterized in that, include: At least two fins are stacked together. The fins are provided with a plurality of spaced flow channel holes. In two adjacent fins, the flow channel holes of one fin partially overlap with the flow channel holes of the other fin, so that two adjacent flow channel holes of one fin are connected in series through one flow channel hole of the other fin.
2. The fin structure as described in claim 1, characterized in that, The cross-section of the flow channel hole is a variable cross-section.
3. The fin structure as described in claim 2, characterized in that, The fins have a length direction consistent with the flow direction of the fluid, and the cross-section of the flow channel holes gradually decreases or gradually increases along the length direction of the fins.
4. The fin structure as described in claim 3, characterized in that, The flow channel has a small cross-section end and a large cross-section end, and the cross-section of the small cross-section end is smaller than the cross-section of the large cross-section end; In two adjacent fins, the projection of the larger end of the flow channel hole of one fin onto the smaller end of the flow channel hole of the other fin on one of the fins is overlapping.
5. The fin structure as described in any one of claims 1 to 4, characterized in that, In two adjacent fin layers, with the surface of the two adjacent fins overlapping each other as the horizontal plane, the projection of one fin onto the other fin is rotated 180 degrees horizontally around the center of the fin and then overlaps with the other fin.
6. The fin structure as described in any one of claims 1 to 4, characterized in that, In two adjacent fin layers, with the normal direction of the overlapping surfaces of the two adjacent fins as the vertical direction, the projection of one fin onto the other fin is rotated 180 degrees vertically around the central axis of the fin and then overlaps with the other fin.
7. The fin structure as described in any one of claims 1 to 4, characterized in that, In the same fin, a plurality of flow channel holes form at least two rows of flow channel groups, the at least two rows of flow channel groups are spaced apart along the width direction of the fin, and each row of flow channel groups includes a plurality of flow channel holes spaced apart along the length direction of the fin.
8. The fin structure as described in claim 7, characterized in that, The flow channel holes in two adjacent columns of the flow channel group are staggered.
9. A radiator, characterized in that, include: A heat dissipation substrate, the heat dissipation substrate having a mounting surface; The fin structure as described in any one of claims 1 to 8, wherein the fin structure is disposed on the mounting surface.