Closed internal circulation water channel plate and reactive aging test system

Abstract

The invention provides a closed internal circulation water channel plate, which comprises a water channel plate main body, a water channel plate and a water channel plate, an internal circulation water channel structure is arranged in the groove; the internal circulation water channel structure is communicated with a water inlet and a water outlet penetrating through the water channel plate main body; the heat transfer assembly covers the groove and is in contact with the top of the internal circulation water channel structure; the top of the heat transfer assembly is used for placing a power module so as to conduct heat generated by the power module to the cooling water in the groove. The bottom of the heat transfer assembly is in contact with cooling water, the top of the heat transfer assembly is in contact with the power module to form an indirect heat conduction path, the power module does not need to be in direct contact with the cooling water, the water stain residue problem caused by water flow scouring the power module is avoided, and the heat dissipation requirement is met; the technical problem of high equipment maintenance cost caused by pollution of the power module due to direct contact of water with the power module for heat dissipation is solved.

Description

Technical Field

[0001] The present application relates to the technical field of aging testing of power modules, and in particular to a closed internal circulation waterway board and a reactive aging testing system. Background Art

[0002] Reactive power aging testing is a key method for evaluating the long-term reliability of power modules. It utilizes an inductive load to generate a controllable reactive current, simulating the module's operation under real-world reactive conditions. This accelerates the module's aging process and identifies potential failure modes. During this test, the high-speed switching within the power module generates significant power losses, causing its junction temperature to undergo drastic cyclic fluctuations in a very short period of time. This high-frequency and large-scale temperature shock places extremely high demands on the module's heat dissipation.

[0003] Currently, mainstream reactive power aging test equipment in the industry generally uses an open water channel plate cooling solution. This solution places the power module directly on a test water channel plate with a sealing ring, using circulating cooling water to directly flush the module's metal base plate to remove heat and control temperature rise. However, this water contact cooling method has a number of significant drawbacks: (1) After the test, the module cools down quickly, and the cooling water remaining on the substrate evaporates to form water stains, the main components of which are mineral crystals or oxidation spots. This directly causes the appearance of the module to fail to meet quality standards, affecting the product qualification rate.

[0004] (2) In order to minimize water contamination, high-purity cooling water needs to be used continuously and frequently replaced, which not only significantly increases procurement costs but also brings additional equipment downtime and maintenance burdens.

[0005] (3) The module is pressed against the open waterway plate by a cylinder, relying on a seal to block water flow. In actual operation and under long-term thermal cycles, there is a risk of seal failure leading to cooling water leakage, which may damage expensive test equipment and the module under test. Summary of the Invention

[0006] The embodiments of the present application provide a closed internal circulation water channel plate and a reactive aging test system to solve the technical problem of high equipment maintenance cost caused by the use of cooling water directly contacting the module substrate for heat dissipation in the reactive aging test of the power module in the related art.

[0007] In a first aspect, a closed internal circulation water channel plate is provided, which includes: a water channel plate body, a groove being provided on the surface of the water channel plate; an internal circulation water channel structure being provided in the groove; the internal circulation water channel structure being connected to a water inlet and a water outlet that pass through the water channel plate body; a heat transfer component, which is sealed in the groove and contacts the top of the internal circulation water channel structure; the top of the heat transfer component is used to place a power module, so as to transfer the heat generated by the power module to the cooling water in the groove.

[0008] In some embodiments, the heat transfer component adopts a three-layer composite structure, in which the upper layer is an oxygen-free copper plate, the lower layer is an aluminum alloy plate, and the middle layer is a transition plate made of silicon carbide reinforced aluminum-based composite material; the transition plate connects the oxygen-free copper plate and the aluminum alloy plate respectively; the oxygen-free copper plate is in contact with the power module, and the aluminum alloy plate is in contact with the cooling water in the internal circulation water channel structure.

[0009] In some embodiments, the annular wall of the groove is provided with an annular protrusion; the annular protrusion and the bottom of the groove form a cavity, and the annular side of the cavity is divided into a long side wall and a short side wall; along the length direction of the long side wall, the middle is an internal circulation water channel structure, and the two sides are a first chamber and a second chamber connected to the internal circulation water channel structure; the first chamber is connected to the water inlet, and the second chamber is connected to the water outlet; the heat transfer component is fixedly mounted on the annular protrusion.

[0010] In some embodiments, an L-shaped guide body and a U-shaped guide body are fitted at the bottom of the groove, the opening of the U-shaped guide body is arranged toward the second chamber, and the long side of the L-shaped guide body is located in the middle of the opening of the U-shaped guide body, and a gap is provided between the long side and the bottom of the opening of the U-shaped guide body to form an S-shaped flow path unit; a plurality of S-shaped flow path units are provided along the length direction of the short side wall to form an internal circulation water channel structure; the first S-shaped flow path unit is arranged close to one of the long side walls, and the short side of its L-shaped guide body is perpendicularly connected to the long side wall; the short side of the L-shaped guide body of each subsequent S-shaped flow path unit is perpendicularly connected to the U-shaped guide body of the previous S-shaped flow path unit; the U-shaped guide body of the last S-shaped flow path unit is fitted with the other long side wall.

[0011] In some embodiments, the short side of the L-shaped guide body and the open bottom of the U-shaped guide body are both configured as arc-shaped convex portions; the arc-shaped convex portion of the L-shaped guide body opens toward the first chamber; and the arc-shaped convex portion of the U-shaped guide body opens toward the second chamber.

[0012] In some embodiments, the distance between the long side of the L-shaped guide body of the S-shaped flow path unit and the two U-shaped guide bodies gradually decreases to a first preset distance along the cooling water flow direction, and then gradually increases to a second preset distance.

[0013] In some embodiments, a sealing groove is provided at the connection between the heat transfer component and the waterway plate body, and a fluororubber sealing ring is provided in the sealing groove.

[0014] In some embodiments, a recess is provided on the top of the heat transfer assembly; the power module can be removably disposed in the recess.

[0015] In some embodiments, a plurality of positioning pins are provided on the top of the heat transfer component to accurately position the power module in contact with the heat transfer component.

[0016] On the second aspect, the present application also provides a reactive aging test system, which includes: a cooling water circulation module, which connects the water inlet and the water outlet through a sealed pipe to form a closed cooling circuit; a pressing module, which includes an electric servo-driven pressure head and a pressure sensor, for pressing the power module onto the heat transfer component with a constant pressure; a temperature control module, which is used to adjust the water temperature and flow of the cooling water circulation module in real time; a test power supply, which is used to apply reactive current to the power module to simulate the junction temperature cycle condition.

[0017] The beneficial effects of the technical solution provided by this application include: The present invention provides a closed internal circulation waterway plate, wherein a heat transfer component covers the top of the groove and is fixedly connected to the waterway plate body, forming a closed space, so that the cooling water in the internal circulation waterway structure is completely confined within the closed space. The power module is placed only on the top of the heat transfer component, without direct contact with the cooling water, thus avoiding the problem of water stains caused by water flow scouring the power module. The bottom of the heat transfer component contacts the cooling water, and the top contacts the power module, forming an indirect heat conduction path. This design not only meets the heat dissipation requirements of the power module during testing with high frequency and large temperature shocks, but also retains the advantages of high water heat dissipation efficiency. At the same time, it avoids the disadvantages of direct water contact with the power module, fundamentally eliminating the problem of appearance failure caused by water stains, and significantly improving the pass rate of the tested modules. The heat transfer component directly contacts the cooling water and the module, and the heat conduction path is short and efficient, which can meet the requirements of the power module junction temperature changing dramatically in a very short time, ensuring that the module will not be damaged due to insufficient heat dissipation during the test, and ensuring the accuracy and stability of the reactive power aging test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 A schematic diagram of the structure of a closed internal circulation waterway plate provided in an embodiment of the present application; Figure 2 A schematic diagram of the bottom structure of a closed internal circulation waterway plate provided in an embodiment of the present application; Figure 3A schematic diagram of the cross-sectional structure of a closed internal circulation waterway plate provided in an embodiment of the present application; Figure 4 Schematic diagram of the top structure of the closed internal circulation waterway plate provided in an embodiment of the present application.

[0020] In the figure: 1. Water channel plate body; 101. Water inlet; 102. Water outlet; 103. Groove; 2. Internal circulation water channel structure; 3. Heat transfer component; 31. Positioning pin; 4. Annular protrusion; 5. First chamber; 6. Second chamber; 7. S-shaped flow path unit; 71. L-shaped guide body; 72. U-shaped guide body; 8. Arc-shaped protrusion. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] In order to make the technical problem to be solved by this application clearer, the causes of the technical problem will be specifically analyzed below.

[0023] Reactive power aging testing places strict demands on the visual quality of power modules, particularly on the metal substrate, which must be free of stains, oxidation spots, and other defects. Traditional open-water channel heat dissipation systems rely on cooling water flowing directly through the module substrate to remove heat. This process inevitably leads to defects: trace minerals in the cooling water evaporate as the module cools, leaving behind white crystalline stains. Furthermore, the continuous impact of the water on the metal substrate damages the oxide layer, accelerating localized electrochemical corrosion and forming dark oxidation spots. These stains cannot be removed with simple cleaning, leading to unsatisfactory module appearance. The root cause lies in the direct contact between the heat dissipation medium and the object being cooled, resulting in the unavoidable physical and chemical interaction between the two. To reduce water contamination, traditional solutions require the use of high-purity cooling water, but this presents a double cost contradiction. The preparation or procurement cost of high-purity cooling water is 5-10 times that of ordinary tap water. For test equipment with an average daily circulation volume of hundreds of liters, the long-term use cost increases significantly. Even if pure water is used, the water will gradually become contaminated after flowing through pipes and module substrates due to the dissolution of metal ions and the growth of microorganisms. Regular shutdown and replacement are required, resulting in reduced equipment utilization and indirectly increasing the cost of the test cycle.

[0024] In summary, the core technical problem lies in the direct contact between water and the power module in traditional heat dissipation solutions. While water is an irreplaceable heat dissipation medium, direct contact inevitably leads to subsequent problems. Therefore, it is necessary to structurally eliminate direct contact between water and the power module. This is precisely the solution proposed in this application's closed internal circulation waterway board.

[0025] The embodiment of the present application provides a closed internal circulation waterway plate, referring to Figure 1-4 , Figure 1 This is a schematic diagram of the closed internal circulation waterway plate structure provided in the embodiment of this application. Figure 1 As shown, a closed internal circulation waterway plate includes: a waterway plate body 1, a groove 103 being provided on its surface; an internal circulation waterway structure 2 being provided in the groove 103; the internal circulation waterway structure 2 being connected to a water inlet 101 and a water outlet 102 that pass through the waterway plate body 1; a heat transfer component 3, which is sealed in the groove 103 and contacts the top of the internal circulation waterway structure 2; the top of the heat transfer component 3 is used to place a power module for transferring heat generated by the power module to the cooling water in the groove 103.

[0026] By setting up this structure, the heat transfer component 3 covers the top of the groove 103 and is fixedly connected to the waterway plate body 1, forming an enclosed space. The cooling water in the internal circulation waterway structure 2 is completely confined within the enclosed space. The power module is placed only on the top of the heat transfer component 3, without direct contact with the cooling water, avoiding the problem of water stains caused by water scouring the power module. The bottom of the heat transfer component 3 contacts the cooling water, and the top contacts the power module, forming an indirect heat conduction path. This design not only meets the heat dissipation requirements of the power module during testing with high frequency and large temperature shocks, but also retains the advantages of high water heat dissipation efficiency. At the same time, it avoids the disadvantages of direct water contact with the power module, fundamentally eliminating the problem of appearance failure caused by water stains, and significantly improving the pass rate of the tested modules. The heat transfer component 3 directly contacts the cooling water and the power module, and the heat conduction path is short and efficient. It can meet the requirements of the power module junction temperature changing dramatically in a very short time, ensuring that the power module will not be damaged due to insufficient heat dissipation during the test, and ensuring the accuracy and stability of the reactive power aging test.

[0027] In some preferred embodiments, the heat transfer component 3 adopts a three-layer composite structure, in which the upper layer is an oxygen-free copper plate, the lower layer is an aluminum alloy plate, and the middle layer is a transition plate made of silicon carbide reinforced aluminum-based composite material; the transition plates connect the oxygen-free copper plate and the aluminum alloy plate respectively; the oxygen-free copper plate is in contact with the power module, and the aluminum alloy plate is in contact with the cooling water in the internal circulation water channel structure 2.

[0028] In this embodiment, the three-layer composite structure is functionally partitioned and transitionally matched. The upper oxygen-free copper plate, constructed from C1100, is 8mm thick and has a thermal conductivity of 398W / mK. It directly contacts the power module, leveraging its high thermal conductivity to rapidly absorb module heat. The lower aluminum alloy plate, directly in contact with the cooling water, utilizes a 6061-T6 aluminum alloy water channel layer, offering corrosion resistance against water erosion. The middle layer utilizes a transition plate made of silicon carbide-reinforced aluminum-based composite material, whose thermal expansion coefficient lies between that of copper and aluminum. This buffers the thermal expansion difference between the two and prevents interfacial cracking caused by thermal shock. This design preserves the high thermal conductivity of copper and the corrosion resistance of aluminum while eliminating thermal stress risks through the transition layer. This ensures that the heat transfer component 3 maintains structural stability during long-term, high-frequency thermal cycles, keeping the thermal resistance below 0.01°C / W and ensuring undiminished heat dissipation efficiency.

[0029] In some preferred embodiments, the annular wall of the groove 103 is provided with an annular protrusion 4; the annular protrusion 4 and the bottom of the groove 103 form a cavity, and the annular side of the cavity is divided into a long side wall and a short side wall; along the length direction of the long side wall, the middle is the internal circulation water channel structure 2, and the two sides are the first chamber 5 and the second chamber 6 connected to the internal circulation water channel structure 2; the first chamber 5 is connected to the water inlet 101, and the second chamber 6 is connected to the water outlet 102; the heat transfer component 3 is fixedly mounted on the annular protrusion 4.

[0030] In this embodiment, the annular protrusion 4 provides a stable support frame for the heat transfer component 3, so that a uniform gap is formed between the heat transfer component 3 and the bottom of the groove 103, avoiding local deformation due to stress, and ensuring that its bottom is in full contact with the cooling water in the internal circulation water channel structure 2. The design of the first chamber 5 and the second chamber 6 allows the cooling water to enter the first chamber 5 from the water inlet, first complete the flow distribution, and then evenly flow into the internal circulation water channel structure 2 in the middle, avoiding the local flow rate being too high due to the direct flow of water; the cooling water after absorbing heat is collected in the second chamber 6 and then discharged from the water outlet, ensuring that the water flow in the entire flow channel is evenly distributed and eliminating heat dissipation dead corners. In addition, the heat transfer component 3 is mounted on the annular protrusion 4, and the contact surface between its edge and the annular protrusion 4 provides a stable reference for sealing, further enhancing the sealing of the closed structure and eliminating the risk of water leakage.

[0031] In some preferred embodiments, an L-shaped guide body 71 and a U-shaped guide body 72 are fitted at the bottom of the groove 103, the opening of the U-shaped guide body 72 is arranged toward the second chamber 6, and the long side of the L-shaped guide body 71 is located in the middle of the opening of the U-shaped guide body 72, and a gap is formed between the long side and the bottom of the opening of the U-shaped guide body 72, forming an S-shaped flow path unit 7; a plurality of S-shaped flow path units 7 are provided along the length direction of the short side wall to form an internal circulation water channel structure 2; the first S-shaped flow path unit 7 is arranged close to one of the long side walls, and the short side of its L-shaped guide body 71 is perpendicularly connected to the long side wall; the short side of the L-shaped guide body 71 of each subsequent S-shaped flow path unit 7 is perpendicularly connected to the U-shaped guide body 72 of the previous S-shaped flow path unit 7; the U-shaped guide body 72 of the last S-shaped flow path unit 7 is fitted with the other long side wall.

[0032] In this embodiment, the internal circulation water channel structure 2 formed by the parallel connection of multiple S-shaped flow path units 7 forces the cooling water to flow along an "S" path through the alternating obstruction of the L-shaped guide body 71 and the U-shaped guide body 72, significantly extending the residence time of the water flow in the water channel. In this embodiment, the total length of the flow channel can reach 4.2m. More importantly, the S-shaped path will destroy the laminar state of the water flow, forming strong turbulence. The water flow will generate eddies at the bends due to the obstruction of the guide body, which increases the collision and disturbance with the guide body and the water channel wall, thereby improving the heat exchange efficiency between the cooling water and the bottom of the heat transfer component 3. This design specifically solves the heat dissipation requirements under high-frequency temperature shocks, ensuring that the heat of the module can be quickly taken away and avoiding the risk of explosion caused by excessive junction temperature. At the same time, the uniform distribution of multiple S-shaped flow path units 7 makes the water flow velocity consistent throughout the water channel, eliminating local overheating and improving heat dissipation stability.

[0033] In some preferred embodiments, the short side of the L-shaped guide body 71 and the open bottom of the U-shaped guide body 72 are both set as arc-shaped convex portions 8; the arc-shaped convex portion 8 of the L-shaped guide body 71 opens toward the first chamber 5; and the arc-shaped convex portion 8 of the U-shaped guide body 72 opens toward the second chamber 6.

[0034] In this embodiment, the arc-shaped protrusion 8 on the short side of the L-shaped guide body 71 and the bottom of the opening of the U-shaped guide body 72 optimizes the right-angle turn into a smooth transition, reducing the impact resistance of the water flow. The arc design allows the water flow to naturally turn along the curved surface of the arc-shaped protrusion 8, avoiding energy loss and maintaining a stable flow rate. At the same time, the arc-shaped protrusion 8 faces a specific direction, guiding the water flow to converge toward the center of the flow channel, eliminating the vortex dead corners on the inside of the corners, and ensuring that the water flow can evenly flush all areas. This design allows the cooling water to have more complete contact with the guide body and the water channel wall, making the heat exchange more uniform and further improving the heat dissipation efficiency; at the same time, the reduced water flow resistance reduces the demand for circulation pump power, indirectly saving energy consumption, and avoiding the deposition of impurities in dead corners, extending the water channel cleaning cycle.

[0035] In some preferred embodiments, the distance between the long side of the L-shaped guide body 71 of the S-shaped flow path unit 7 and the two U-shaped guide bodies 72 gradually decreases to a first preset distance along the downstream direction of the cooling water, and then gradually increases to a second preset distance.

[0036] In this embodiment, the distance between the long side of the L-shaped guide body 71 and the U-shaped guide body 72 is first reduced to a first preset distance, and then increased to a second preset distance, forming a gradient cross-section flow channel. The water flow velocity accelerates and the pressure decreases in the contraction section, generating strong turbulence and enhancing heat exchange; the flow velocity slows down and the pressure rises in the expansion section, avoiding the continuous generation of bubbles. This design not only enhances the turbulence effect and improves the heat dissipation efficiency through the contraction section, but also suppresses cavitation through the expansion section, reducing the impact of bubble bursts on the water channel wall, and resolving the contradiction between turbulence enhancement and cavitation prevention. During long-term use, it can reduce erosion damage to the water channel wall and extend the service life of the internal circulation water channel structure 2; at the same time, the stable flow rate and pressure make the cooling water circulation smoother, ensuring that the heat dissipation capacity does not decay during long-term testing.

[0037] In some preferred embodiments, a sealing groove is provided at the connection between the heat transfer component 3 and the water channel plate body 1, and a fluororubber sealing ring is provided in the sealing groove.

[0038] In this embodiment, the sealing groove and fluororubber sealing ring cooperate to provide a reliable seal at the joint. Fluororubber has excellent temperature and aging resistance, adapting to the dramatic temperature fluctuations during testing and maintaining good elasticity even after long-term use. The sealing groove provides a fixed space for the sealing ring, preventing it from shifting under water pressure. This design ensures the integrity of the closed internal circulation, completely eliminating cooling water overflow and protecting the test equipment from water damage. Furthermore, the chemical stability of fluororubber prevents it from degrading due to contact with cooling water, further extending the replacement cycle of the sealing system and reducing maintenance costs.

[0039] In some preferred embodiments, a recess is provided on the top of the heat transfer component 3; the power module can be detachably mounted in the recess.

[0040] In this embodiment, the recess at the top of the heat transfer assembly 3 is aligned with the outer contour of the power module, allowing the power module to fit precisely into the recess and prevent slipping through mechanical stoppers. This design ensures that the power module maintains maximum contact with the heat transfer assembly 3 during testing, reducing thermal resistance and ensuring efficient heat dissipation. Furthermore, the recess guides the power module for rapid positioning, reducing the time and errors associated with manual alignment and improving test efficiency. Furthermore, the recess is typically designed to be slightly less deep than the module thickness, ensuring that the top of the module remains accessible for manipulation, such as connecting test leads, even after placement. This balances positioning functionality with operational convenience, making it ideal for batch module testing scenarios.

[0041] In some preferred embodiments, a plurality of positioning pins 31 are provided on the top of the heat transfer component 3 for accurately positioning the power module in contact with the heat transfer component 3 .

[0042] In this embodiment, multiple positioning pins cooperate with the positioning holes at the bottom of the power module. The positioning pins can be tapered positioning pins to minimize the module positioning error and ensure that the heat center is accurately aligned with the efficient heat dissipation area of ​​the internal circulation water channel structure 2.

[0043] On the second aspect, the present application also provides a reactive aging test system, which includes: a cooling water circulation module, which connects the water inlet 101 and the water outlet 102 through a sealed pipeline to form a closed cooling circuit; a pressing module, which includes an electric servo-driven pressure head and a pressure sensor, for pressing the power module onto the heat transfer component 3 with a constant pressure; a temperature control module, which is used to adjust the water temperature and flow of the cooling water circulation module in real time; a test power supply, which is used to apply reactive current to the power module to simulate the junction temperature cycle condition.

[0044] By setting up this system, the closed internal circulation waterway plate combines with the cooling water circulation module to form a closed cooling loop, completely isolating the cooling water from the power modules. This design fundamentally avoids the residual water stains caused by direct contact of cooling water with the power modules in traditional open solutions, thereby improving the appearance qualification rate of power modules after testing. At the same time, the closed loop, combined with sealed piping, completely eliminates the risk of water leakage, preventing damage to test equipment and power modules due to leaks, and reducing equipment maintenance costs. The modules work together, with the test power supply providing controllable reactive current to simulate operating conditions, the closed waterway plate combined with the circulation module to achieve waterless contact heat dissipation, the press-fit module ensuring heat transfer efficiency, and the temperature control module stabilizing the junction temperature. This integrated design reduces the coordination errors of the dispersed equipment in traditional systems, eliminates the risk of equipment damage due to water leakage, and is suitable for efficient and safe testing of batch power modules.

[0045] The beneficial effects brought about by the present invention include: A closed internal circulation waterway plate is provided, wherein a heat transfer assembly 3 covers the top of the groove 103 and is fixedly connected to the waterway plate body 1, forming an enclosed space. The cooling water in the internal circulation waterway structure 2 is completely confined within the enclosed space. The power module is placed only on top of the heat transfer assembly 3, without direct contact with the cooling water, thus avoiding the problem of residual water stains caused by water scouring the power module. The bottom of the heat transfer assembly 3 contacts the cooling water, while the top contacts the power module, forming an indirect heat conduction path. This design not only meets the heat dissipation requirements of the power module during testing, but also retains the advantages of high water heat dissipation efficiency. It also avoids the disadvantages of direct water contact with the power module, fundamentally eliminating the problem of appearance defects caused by water stains, and significantly improving the pass rate of the tested modules. The heat transfer assembly 3 directly contacts the cooling water and the power module, resulting in a short and efficient heat conduction path. This can meet the requirements of the power module's drastic changes in junction temperature in a very short period of time, ensuring that the power module will not be damaged due to insufficient heat dissipation during testing, and ensuring the accuracy and stability of reactive power aging testing.

[0046] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0047] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0048] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A closed internal circulation waterway plate, characterized in that: It includes: A waterway plate body (1) is provided with a groove (103) on its surface; an internal circulation waterway structure (2) is provided in the groove (103); the internal circulation waterway structure (2) is connected to a water inlet (101) and a water outlet (102) that pass through the waterway plate body (1); A heat transfer component (3) is sealed on the groove (103) and contacts the top of the internal circulation water channel structure (2); the top of the heat transfer component (3) is used to place a power module, so as to conduct heat generated by the power module to the cooling water in the groove (103).

2. The closed internal circulation waterway plate according to claim 1, characterized in that: The heat transfer component (3) adopts a three-layer composite structure, wherein the upper layer is an oxygen-free copper plate, the lower layer is an aluminum alloy plate, and the middle layer is a transition plate made of silicon carbide reinforced aluminum-based composite material; the transition plates are respectively connected to the oxygen-free copper plate and the aluminum alloy plate; The oxygen-free copper plate is in contact with the power module, and the aluminum alloy plate is in contact with the cooling water in the internal circulation water channel structure (2).

3. The closed internal circulation waterway plate according to claim 1, characterized in that: The annular wall of the groove (103) is provided with an annular protrusion (4); The annular protrusion (4) and the bottom of the groove (103) form a cavity, and the annular side of the cavity is divided into a long side wall and a short side wall; along the length direction of the long side wall, the middle is the internal circulation water channel structure (2), and the two sides are the first chamber (5) and the second chamber (6) connected to the internal circulation water channel structure (2); the first chamber (5) is connected to the water inlet (101), and the second chamber (6) is connected to the water outlet (102); The heat transfer component (3) is fixedly mounted on the annular protrusion (4).

4. The closed internal circulation waterway plate according to claim 3, characterized in that: An L-shaped guide body (71) and a U-shaped guide body (72) are fitted on the bottom of the groove (103), the opening of the U-shaped guide body (72) is arranged toward the second chamber (6), and the long side of the L-shaped guide body (71) is located in the middle of the opening of the U-shaped guide body (72), and a gap is provided between the long side and the bottom of the opening of the U-shaped guide body (72), thereby forming an S-shaped flow path unit (7); A plurality of S-shaped flow path units (7) are provided along the length direction of the short side wall to form the internal circulation water channel structure (2); wherein the first S-shaped flow path unit (7) is provided close to one of the long side walls, and the short side of its L-shaped guide body (71) is vertically connected to the long side wall; the short side of the L-shaped guide body (71) of each subsequent S-shaped flow path unit (7) is vertically connected to the U-shaped guide body (72) of the previous S-shaped flow path unit (7); and the U-shaped guide body (72) of the last S-shaped flow path unit (7) is attached to the other long side wall.

5. The closed internal circulation waterway plate according to claim 4, characterized in that: The short side of the L-shaped guide body (71) and the open bottom of the U-shaped guide body (72) are both configured as arc-shaped convex portions (8); The arc-shaped convex portion (8) of the L-shaped guide body (71) opens toward the first chamber (5); and the arc-shaped convex portion (8) of the U-shaped guide body (72) opens toward the second chamber (6).

6. The closed internal circulation waterway plate according to claim 4, characterized in that: The distance between the long side of the L-shaped guide body (71) of the S-shaped flow path unit (7) and the U-shaped guide bodies (72) on both sides gradually decreases to a first preset distance along the downstream direction of the cooling water, and then gradually increases to a second preset distance.

7. The closed internal circulation waterway plate according to claim 1, characterized in that: A sealing groove is provided at the connection between the heat transfer component (3) and the water channel plate body (1), and a fluororubber sealing ring is provided in the sealing groove.

8. The closed internal circulation waterway plate according to claim 1, characterized in that: The top of the heat transfer component (3) is provided with a recess; The power module can be detachably mounted in the recess.

9. The closed internal circulation waterway plate according to claim 1, characterized in that: A plurality of positioning pins (31) are provided on the top of the heat transfer component (3) for accurately positioning a power module in contact with the heat transfer component (3).

10. A reactive aging test system, characterized in that: It includes: Providing a closed internal circulation waterway plate as claimed in claim 1; A cooling water circulation module, which connects the water inlet (101) and the water outlet (102) via a sealed pipeline to form a closed cooling circuit; A press-fitting module comprising an electric servo-driven press head and a pressure sensor for pressing the power module onto the heat transfer component (3) with a constant pressure; A temperature control module, which is used to adjust the water temperature and flow of the cooling water circulation module in real time; The test power supply is used to apply reactive current to the power module to simulate the junction temperature cycle condition.

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