Busbar connection, power module assembly, converter and wind turbine generator system

Abstract

The utility model discloses an embodiment provides a kind of connecting busbar, power module assembly, converter and wind turbine generator unit, wherein, connecting busbar includes busbar mainboard and the connecting terminal that extends outward from busbar mainboard, connecting terminal includes cylinder section, the first connecting section at the first end of cylinder section and the second connecting section at the second end of cylinder section, and the second connecting section is used to be connected with cable.Due to the connecting terminal of connecting busbar has cylinder section, compared with the flat shape of connecting terminal as a whole, it is more convenient to seal the periphery of cylinder section, so that the connecting hole of the box that connecting busbar passes through is sealed and connected, and it is beneficial to ensure sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation, specifically to a connection busbar, power module assembly, converter and wind turbine generator set. Background Technology

[0002] The converter, through power conversion, enables the generator to output constant-frequency electricity and is a crucial component of wind turbine generator sets, playing a key role in their operation. The power module is the core component of the converter, responsible for power conversion. Because the power module contains numerous semiconductor devices, it generates heat during operation, especially the IGBTs, which are the primary heat-generating elements. The cooling effect of the converter significantly impacts the operating efficiency and stability of the wind turbine generator set. Existing technology has proposed immersing the power module in liquid cooling medium within the converter housing for cooling. While this method is effective in heat dissipation to some extent, the power module still needs to extend out of the housing via connecting busbars to connect to external electrical components, posing a potential leakage risk to the portion of the connecting busbars extending out of the housing. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide a connection busbar, power module assembly, converter and wind turbine generator set, wherein the connection terminals of the connection busbar are easy to seal.

[0004] A first aspect of this utility model provides a connecting busbar, which includes a busbar main board and connecting terminals extending outward from the busbar main board. The connecting terminals include a column segment, a first connecting segment located at a first end of the column segment, and a second connecting segment located at a second end of the column segment. The second connecting segment is used for connecting to a cable.

[0005] Furthermore, in some embodiments, the connection terminals are bent at a predetermined angle relative to the busbar mainboard.

[0006] Furthermore, in some embodiments, the cross-section of the column segment is circular or elliptical.

[0007] Furthermore, in some embodiments, the column segment, the first connecting segment, and the second connecting segment are integrally formed; or at least one of the first connecting segment and the second connecting segment is plugged into the column segment.

[0008] A second aspect of this utility model provides a power module assembly, comprising: a housing having a receiving cavity, the housing wall having a first connection hole communicating with the receiving cavity and the outside; a power module disposed in the receiving cavity; and a connecting busbar as described in any of the above embodiments, wherein the connecting terminals of the connecting busbar are inserted into the first connection hole and electrically connected to the power module, wherein the connecting terminals are sealed to the first connection hole through a column section.

[0009] Furthermore, in some embodiments, the power module assembly further includes a sealing ring fitted around the outer periphery of the cylindrical section or the edge of the first connecting hole to seal the gap between the cylindrical section and the first connecting hole; and / or the shape of the first connecting hole is adapted to the shape of the cylindrical section.

[0010] Furthermore, in some embodiments, the power module includes an IGBT.

[0011] Furthermore, in some embodiments, the cavity is filled with a phase change cooling medium, and the power module is immersed in the phase change cooling medium.

[0012] Furthermore, in some embodiments, at least a portion of the enclosure wall is a light-transmitting portion.

[0013] Furthermore, in some embodiments, the top of the housing has an air outlet communicating with the receiving cavity, the air outlet being used to discharge the phase change cooling medium that has changed to a gaseous state; the housing also has a liquid inlet communicating with the receiving cavity, the liquid inlet being used to allow the liquid phase change cooling medium to enter.

[0014] A third aspect of this utility model provides a converter, which includes: a power module assembly as provided in any of the above embodiments; and a condenser, wherein the inlet of the condenser is connected to the outlet of the housing, and the outlet of the condenser is connected to the liquid inlet of the housing, for condensing the evaporated phase change cooling medium flowing out from the housing cavity.

[0015] A fourth aspect of this utility model provides a wind turbine generator set, including a power module assembly as provided in the second aspect of the above-described embodiment, or a converter as provided in the third aspect of the above-described embodiment.

[0016] According to the embodiment of this utility model, the connecting busbar has a column section in its connecting terminal. Compared with the connecting terminal of the traditional connecting busbar, which is generally flat, it is easier to perform sealing treatment on the outer periphery of the column section. For example, it is easier to install a sealing ring, thereby facilitating the sealing connection between the connecting busbar and the connecting hole of the housing through which it passes, which helps to ensure the sealing effect.

[0017] According to the power module assembly provided in the embodiment of the present utility model, since it has the connecting busbar provided in the first aspect embodiment, it is convenient to perform sealing treatment between the cylindrical section and the first connecting hole. The sealing is convenient, so when the cavity is filled with cooling medium, such as phase change cooling medium, it can prevent the cooling medium from leaking out through the first connecting hole.

[0018] The converter provided according to the embodiments of this utility model, having the power module assembly provided in the second aspect embodiment, thus possesses the beneficial effects of the second aspect embodiment, which will not be elaborated further here. Furthermore, a condenser can be used to condense the phase change cooling medium flowing out of the receiving cavity from its gaseous state into a liquid phase change cooling medium. The liquid phase change cooling medium is then returned to the receiving cavity of the housing through the liquid inlet, allowing for the recycling of the phase change cooling medium, saving raw materials and reducing costs. Moreover, the phase change cooling system has a simple structure and good cooling effect.

[0019] The wind turbine generator set provided according to the embodiments of the present utility model has the power module assembly provided in the second aspect embodiment or the converter provided in the third aspect embodiment, and thus has the beneficial effects of the second aspect embodiment or the third aspect embodiment, which will not be repeated here.

[0020] Other aspects and / or advantages of the present invention will be set forth in part in the description which follows, and in part will be clear from the description or may be learned by practice of the present invention. Attached Figure Description

[0021] The above and other objects and features of this utility model will become clearer from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 A schematic diagram of the DC busbar of a converter according to one embodiment of the related art is shown;

[0023] Figure 2 A schematic diagram of the connection busbar of one embodiment of this application is shown;

[0024] Figure 3 This invention provides a schematic diagram of the connection between the busbar and the housing according to an embodiment of the present application.

[0025] Figure 4 A schematic diagram of a power module assembly according to an embodiment of this application is shown;

[0026] Figure 5 It shows Figure 4 A magnified view of a portion of point I in the middle;

[0027] Figure 6 A schematic diagram of a power module assembly according to an embodiment of this application is shown;

[0028] Figure 7 Another structural schematic diagram of a power module assembly according to one embodiment of this application is shown;

[0029] Figure 8 Another structural schematic diagram of a power module assembly according to an embodiment of this application is shown;

[0030] Figure 9 A first internal partial structural schematic diagram of a power module assembly according to an embodiment of this application is shown;

[0031] Figure 10 A second internal partial structural schematic diagram of a power module assembly according to an embodiment of this application is shown;

[0032] Figure 11 It shows Figure 10 A magnified view of a section at point J;

[0033] Figure 12 A third internal partial structure schematic diagram of a power module assembly according to an embodiment of this application is shown;

[0034] Figure 13 It shows Figure 12 A magnified view of the area at point K.

[0035] Figure 1 Explanation of icon numbers:

[0036] 300A DC busbar; 320A terminal block;

[0037] Figures 2 to 13 Explanation of icon numbers:

[0038] 100 Enclosure; 110 First side plate; 111 First connecting hole; 120 Second side plate; 121 Liquid inlet; 122 Air extraction port; 130 Third side plate; 131 Reinforcing rib; 140 Fourth side plate; 150 Top plate; 151 Air outlet; 160 Bottom plate; 170 First mounting bracket; 180 Second mounting bracket; 190 Support frame; 191 First connecting part; 192 Second connecting part; 193 Through hole; 200 IGBT; 300 Connecting busbar; 310 Busbar main board; 320 Connecting terminal; 321 First... 1. Connecting section; 322. Column section; 323. Second connecting section; 400. Sealing ring; 500. AC busbar; 600. Sealing pressure plate; 700. Pressure plate; 710. Vertical stiffener; 720. Horizontal stiffener; 730. Window; 740. Reinforcing stiffener; 810. First insulating plate; 820. Second insulating plate; 830. Third insulating plate; 840. Fourth insulating plate; 850. Fifth insulating plate; 860. Safety valve; 870. Liquid level sensor; 880. Pressure sensor; 890. Temperature sensor; 900. Resistor; 910. Third connecting part. Detailed Implementation

[0039] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but may be changed as will become clear upon understanding this disclosure, except for operations that must occur in a specific order. Furthermore, for clarity and conciseness, descriptions of features known in the art may be omitted.

[0040] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein, which will become clear upon understanding the disclosure of this application.

[0041] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more.

[0042] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Thus, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0043] In the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to," or "bonded to" another element, the element may be directly "on" another element, directly "connected to," or "bonded to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on" another element, "directly connected to," or "directly bonded to" another element, no other elements may be present in between.

[0044] The terminology used herein is for the purpose of describing various examples only and is not intended to limit disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. The term “a plurality” represents any quantity of two or more.

[0045] The directional terms “above,” “below,” “top,” and “bottom” used in this application, unless otherwise specified, are based on the orientation of the product when it is in normal use.

[0046] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains after understanding the invention. Unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this invention, and shall not be interpreted in an idealized or overly formalistic manner.

[0047] In the wind power industry, the power module of the converter is the core component for realizing power conversion and control, and its cooling technology has a significant impact on the system's efficiency and stability. Traditional converter power modules are usually cooled by surface-mount water-cooled plates, which has low cooling efficiency. Moreover, water-cooling systems have complex structures.

[0048] To address these shortcomings, this invention develops a direct-contact immersion evaporative cooling system. This system directly immerses the power module in a phase-change cooling medium such as a fluorinated liquid, utilizing the efficient heat conduction characteristics of the phase change process to achieve superior cooling performance. This method not only simplifies the cooling structure and reduces the complexity of the liquid circulation system, but also improves the system's reliability and ease of maintenance.

[0049] Therefore, a housing 100 is needed to house the power module and the phase change cooling medium, allowing the power module to be immersed in the cooling medium. This facilitates the cooling medium's absorption of heat from the power module, causing it to evaporate and vaporize, thus achieving heat dissipation. However, the power module also needs to be connected to other electrical components of the converter (such as battery packs). Therefore, a first connection hole 111 needs to be provided in the housing 100 so that one end of the connecting busbar 300 passes through the first connection hole 111 and is electrically connected to the power module inside the housing, while the other end is electrically connected to the electrical components outside the housing 100. This causes the phase change cooling medium inside the housing to easily leak out through the gap between the first connection hole 111 and the connecting busbar 300. Therefore, the connection between the first connection hole 111 and the connecting busbar 300 needs to be sealed.

[0050] Based on this, the present invention provides a structure for connecting the busbar 300 and a sealing method for connecting the busbar 300 and the first connecting hole 111, which is convenient to seal and has a good sealing effect.

[0051] Of course, those skilled in the art should know that the connecting busbar 300 can also be used for the connection structure of other electrical devices, and is not limited to power modules. The aforementioned immersion evaporative cooling system is also not limited to cooling the power modules of the converter.

[0052] The following explanation, for the sake of clarity, takes the connection busbar 300 of the power module of the converter as an example, combined with... Figures 2 to 13 This invention introduces the connecting busbar 300, power module assembly, converter, and wind turbine generator set provided in the embodiments of this utility model.

[0053] like Figures 2 to 4 As shown, a first aspect of the present invention provides a connecting busbar 300, which includes a busbar main board 310 and connecting terminals 320 extending outward from the busbar main board 310. The connecting terminals 320 include a column section 322, a first connecting section 321 located at a first end of the column section 322, and a second connecting section 323 located at a second end of the column section 322. The second connecting section 323 is used for connecting to a cable.

[0054] The connecting busbar 300 provided in this embodiment has a cylindrical section 322 in its connecting terminal 320, compared to... Figure 1 The conventional connecting busbar 300a shown in the figure has a flat overall shape for the connecting terminal 320a, which makes it easier to perform sealing treatment on the outer periphery of the column section 322. For example, a sealing ring 400 can be fitted on the outer periphery of the column section 322. In this way, when the connecting terminal 320 extends out of the first connecting hole 111 of the housing 100, the column section 322 can be inserted into the first connecting hole 111, and the sealing ring 400 can be sandwiched between the two, which is convenient for sealing and helps to ensure the sealing effect.

[0055] Of course, in other embodiments, the outer periphery of the cylindrical section 322 may not be fitted with a sealing ring 400, but may be sealed using other methods. For example, sealant may be injected between the cylindrical section 322 and the first connecting hole 111 for sealing. The cylindrical section 322 has a larger surface area than the flat connecting terminal, which is beneficial for full contact with the sealant and can improve the sealing effect.

[0056] In addition, the first connecting hole 111 can be a circular hole that matches the shape of the column section 322. This makes it easier for the column section 322 to be properly installed into the first connecting hole 111, and it also helps the sealing ring 400 or sealant to stably support the column section 322, thereby ensuring a stable connection of the connecting busbar 300.

[0057] Furthermore, such as Figure 2 As shown, the cross-section of the cylindrical segment 322 can be circular or elliptical, both of which facilitate the fitting of the sealing ring 400. In particular, when the cross-section of the cylindrical segment 322 is circular, it is easy to adapt to the conventional circular sealing ring 400 in the prior art, without the need to design a sealing ring 400 specifically for the cylindrical segment 322, thus saving costs.

[0058] Furthermore, such as Figures 2 to 5 As shown, the connection terminal 320 can be bent at a preset angle relative to the busbar main board 310. This allows the connection terminal 320 to pass through the first connection hole 111 of the housing 100 and be electrically connected to the power module in the receiving cavity.

[0059] Furthermore, the column segment 322, the first connecting segment 321, and the second connecting segment 323 can be integrally formed. In this case, it is assumed that the column segment 322, the first connecting segment 321, and the second connecting segment 323 are all made of conductive metal. This facilitates processing, ensures a strong connection, and guarantees smooth current flow among the three components, avoiding problems caused by movement at the connection points that could prevent current flow.

[0060] Of course, the column section 322, the first connecting section 321, the second connecting section 323 and the busbar main board 310 can also be integrally formed.

[0061] Alternatively, at least one of the first connecting segment 321 and the second connecting segment 323 can be plugged into the column segment 322. Of course, after they are plugged into each other, an electrical connection will also be achieved by default, thereby enabling the transmission of current among the three.

[0062] As an example, when the first connecting segment 321 and the column segment 322 are plugged into each other, when the connecting busbar 300 is inserted into the first connecting hole 111, the second connecting segment 323 can be passed through the first connecting hole 111 first, and the column segment 322 can be inserted into the first connecting hole 111. After sealing between the column segment 322 and the first connecting hole 111, the column segment 322 and the first connecting segment 321 can be plugged into each other. This is convenient for installation, and there is no obstruction from the busbar main board 310, making it easier to perform sealing treatment, such as installing the sealing ring 400 or injecting sealant.

[0063] In addition, the connecting busbar 300 may have multiple connecting terminals 320, which are distributed on both sides of the busbar main board 310 in the width direction. One of the connecting terminals 320 may have a column section 322, or both connecting terminals 320 may have a column section 322. The design can be made according to the needs.

[0064] like Figures 4 to 13 As shown, a second aspect of this utility model provides a power module assembly, which includes a housing 100, a power module, and a connecting busbar 300 as described in any of the above embodiments. The housing 100 has a receiving cavity, in which the power module is disposed. A first connecting hole 111 communicating between the receiving cavity and the outside is provided on the housing wall of the housing 100. A connecting terminal 320 of the connecting busbar 300 passes through the first connecting hole 111 and is electrically connected to the power module, wherein the connecting terminal 320 is sealed to the first connecting hole 111 through a cylindrical section 322.

[0065] The power module provided in this embodiment has a connecting busbar 300 provided in any of the above embodiments, which facilitates sealing between the column section 322 and the first connecting hole 111. The sealing is convenient, so when the cavity is filled with phase change cooling medium, the phase change cooling medium can be prevented from leaking out through the first connecting hole 111.

[0066] Furthermore, the shape of the first connecting hole 111 can be adapted to the shape of the cylindrical section 322. This facilitates a sealed connection between the two. For example, if a sealing ring 400 is sandwiched between the two, the sealing ring 400 can be uniformly compressed circumferentially, ensuring consistent sealing throughout the cylindrical section 322 and guaranteeing a sealing effect.

[0067] Furthermore, such as Figures 3 to 5 As shown, the power module assembly can also include a sealing ring 400, which is fitted around the outer periphery of the cylindrical section 322 or the edge of the first connecting hole 111 to seal the gap between the cylindrical section 322 and the first connecting hole 111. This provides convenient sealing and a good sealing effect.

[0068] Furthermore, the power module may include an IGBT 200, so that the connecting busbar 300 is electrically connected to the IGBT 200.

[0069] Furthermore, the cavity is filled with a phase change cooling medium, and the power module is immersed in the phase change cooling medium. This facilitates the phase change cooling medium to fully absorb the heat from the power module and evaporate, and also promotes uniform heat dissipation throughout the power module, avoiding localized overheating.

[0070] The phase change cooling medium is an insulating cooling medium, such as fluorinated liquid. Fluorinated liquid typically refers to fluorinated organic liquid compounds, including perfluorocarbons, hydrofluoroethers, and perfluoropolyethers. It has high stability and a low boiling point, making it easy to absorb heat from the power module and evaporate, thus carrying away the heat from the power module. Of course, other types of phase change cooling media can also be used.

[0071] The enclosure 100 can be made of metal, which has high structural strength and is not easily damaged even if the phase change cooling medium evaporates into gas and the pressure increases. Of course, the enclosure 100 can also be made of other materials, or assembled from metal plates and plates of other materials.

[0072] Furthermore, at least a portion of the enclosure wall of the housing 100 can be made translucent. This allows users to easily inspect the phase change status and remaining amount of the phase change cooling medium in the housing cavity through the translucent portion, facilitating the replenishment of the phase change cooling medium and thus ensuring the cooling effect of the phase change cooling medium on the power module. Of course, users can also observe the components in the housing cavity, such as the power module and drive module, through the translucent portion, facilitating maintenance.

[0073] The enclosure wall of the housing 100 may include multiple side panels, with at least one of the side panels having a light-transmitting portion. Positioning the light-transmitting portion on the side facilitates user observation.

[0074] As an example, such as Figure 6 and Figure 7 As shown, the box wall of the box body 100 includes a first side plate 110, a second side plate 120, a third side plate 130, and a fourth side plate 140. The second side plate 120 can be a light-transmitting plate, and the whole can be a light-transmitting part. The structure is simple and easy to process.

[0075] Of course, the second side plate 120 can also be provided with an installation port, and a light-transmitting part can be provided in the installation port.

[0076] The light-transmitting part can be made of acrylic sheet, which has good light transmittance, a certain structural strength, is not easily corroded, and has a long service life. Of course, the light-transmitting part can also be made of glass sheet, which also has good light transmittance and is not easily corroded.

[0077] Furthermore, such as Figure 6 and Figure 7As shown, the enclosure 100 may also include a pressure plate 700, which is pressed against the outside of the light-transmitting part. The pressure plate 700 is provided with a window 730 to expose the light-transmitting part. With this arrangement, even if the light-transmitting part is not made of metal and the air pressure inside the enclosure 100 is relatively high, the light-transmitting part is not easily bulged or deformed due to the compression of the pressure plate 700, which can prevent damage to the light-transmitting part and ensure the airtightness of the enclosure 100.

[0078] There can be multiple windows 730. For example, one window 730 can be located on the upper part of the enclosure 100, and another on the lower part. This facilitates observation of the internal components or phase change cooling medium of the enclosure 100 from both the upper and lower positions, ensuring effective observation. Of course, windows 730 can also be located in other positions.

[0079] The upper and / or lower edges of the window 730 may be provided with outwardly protruding reinforcing ribs 740. This can prevent the window 730 from deforming, thereby ensuring the structural strength of the pressure plate 700 and effectively preventing deformation of the light-transmitting part.

[0080] In addition, the pressure plate 700 can be a metal plate, which is not easily deformed, thus facilitating the stable extrusion of the light-transmitting part.

[0081] In an optional embodiment, such as Figure 6 and Figure 7 As shown, the second side panel 120 is an acrylic sheet, serving as a light-transmitting element. The pressure plate 700 is a metal sheet. The pressure plate 700 may include two vertical stiffeners 710 and multiple horizontal stiffeners 720. The multiple horizontal stiffeners 720 are connected between the two vertical stiffeners 710, and a window 730 is formed between adjacent horizontal stiffeners 720 to expose the second side panel 120. The length of the two vertical stiffeners 710 is equal to or only slightly shorter than the length of the second side panel 120, allowing for better compression of the second side panel 120 in the height direction. The multiple horizontal stiffeners 720 are spaced apart along the length of the second side panel 120, allowing for compression of the second side panel 120 at multiple locations and preventing the second side panel 120 from bulging or deforming. In addition, both vertical stiffeners 710 can be provided with mounting holes, and the edges of the third side plate 130 and the fourth side plate 140 near the second side plate 120 can have connecting flanges. Bolts can be inserted into the connecting flanges through the mounting holes to achieve a firm connection between the pressure plate 700 and the box 100 and to stably compress the second side plate 120.

[0082] Of course, the pressure plate 700 can also take other shapes, and is not limited to the specific embodiments described above. For example, the pressure plate 700 can be a whole plate with multiple circular openings to expose the light-transmitting part.

[0083] Furthermore, such as Figure 6 and Figure 7As shown, the top of the housing 100 can be provided with an air outlet 151 that communicates with the receiving cavity, and the air outlet 151 is used to discharge the phase change cooling medium that has changed from phase to gaseous state; the housing 100 can also be provided with a liquid inlet 121 that communicates with the receiving cavity, and the liquid inlet 121 is used to allow the liquid phase change cooling medium to enter.

[0084] In this way, the phase change cooling medium absorbs heat from the power module and vaporizes, then is discharged through the outlet 151. This relieves the pressure in the containment cavity and carries away heat, achieving cooling and heat dissipation for the power module. Furthermore, an external condenser can be used to condense the discharged phase change cooling medium, and then the condensed liquid phase change cooling medium can be returned to the containment cavity through the liquid inlet 121. This allows for the recycling of the phase change cooling medium without the need for additional replenishment, saving resources and reducing costs.

[0085] As an example, such as Figure 6 As shown, the air outlet 151 can be located on the top plate 150 of the housing 100. This facilitates the smooth discharge of the evaporated hot air through the air outlet 151. Of course, the air outlet 151 can also be located on the upper part of the side plate of the housing 100.

[0086] As an example, such as Figure 6 and Figure 7 As shown, the liquid inlet 121 can be located on the side panel of the housing 100, for example, near the bottom of the housing 100. This helps to avoid the power module inside the housing 100 and facilitates the smooth entry of the phase change cooling medium into the housing 100. In addition, by allowing the phase change cooling medium to enter the housing 100 from the bottom, the existing phase change cooling medium inside the housing 100 can be sufficiently disturbed, promoting the upward escape of the gaseous phase change cooling medium after phase change.

[0087] Furthermore, in some embodiments, such as Figure 6 and Figure 7 As shown, the enclosure 100 includes a first side plate 110 and a second side plate 120 distributed opposite to each other. The connecting busbar 300 can be a DC busbar. The first side plate 110 of the enclosure 100 is provided with a first connection hole 111, through which the DC busbar extends into the receiving cavity and is electrically connected to the power module. The second side plate 120 of the enclosure 100 may be provided with a second connection hole. The power module assembly may also include an AC busbar 500, which extends into the receiving cavity through the second connection hole and is electrically connected to the power module.

[0088] In practical applications, the second side plate 120 can be set facing forward as the front side plate of the enclosure 100, and the first side plate 110 can be set facing backward as the rear side plate of the enclosure 100, so as to facilitate the electrical connection between the DC bus and the AC bus 500 and external electrical components.

[0089] Since the housing 100 is also provided with a second connection hole, the second connection hole also needs to be sealed.

[0090] Furthermore, such as Figure 6 and Figure 7 As shown, the power module assembly may also include a sealing strip (not shown) and a sealing plate 600. The sealing strip is distributed circumferentially along the second connection hole. The sealing plate 600 is provided with an assembly hole for the connection end of the AC busbar 500 to extend out. The sealing plate 600 is connected to the second side plate 120 to press the sealing strip between the AC busbar 500 and the second side plate 120. This provides a good sealing effect. Moreover, if the second side plate 120 is an acrylic sheet, the sealing plate 600 can also compress the acrylic sheet, preventing it from bulging.

[0091] Furthermore, the first side plate 110 can be an insulating plate, and the second side plate 120 can also be an insulating plate. This allows for electrical isolation between the DC busbar and the AC busbar 500 and their corresponding side plates. For example, the first side plate 110 and the second side plate 120 can be resin boards.

[0092] Of course, the first side plate 110 and the second side plate 120 can also be metal plates or plates of other materials. For example, the second side plate 120 can be an acrylic plate mentioned in the above embodiments.

[0093] Furthermore, the third side plate 130 and the fourth side plate 140 can be made of metal plates, which have high structural strength and are not easily deformed. Of course, the third side plate 130 and the fourth side plate 140 can also be made of other materials, not limited to metal plates.

[0094] Furthermore, in some embodiments, such as Figure 8 As shown, the enclosure 100 may also include a first insulating plate 810, which is disposed on the outside of the second side plate 120. The first insulating plate 810 is provided with a clearance opening for the connection busbar 300 to pass through.

[0095] The portion of the connecting busbar 300 extending out of the housing 100 can connect to other connecting busbars. The current transmitted between them generates a magnetic field in the surrounding space. When this magnetic field passes through the metal plate, it triggers a series of electromagnetic effects, producing various impacts. For example... Figure 6 and Figure 7To ensure better compression of the second side plate 120 and prevent deformation, the pressure plate 700 can be designed as a metal plate. However, the connecting busbar 300 extending from the pressure plate 700 can easily affect it. Therefore, a first insulating plate 810 is added to the outside of the pressure plate 700 to isolate the electromagnetic effects of the connecting busbar 300 and the connecting bar on the pressure plate 700, providing good electrical isolation. Furthermore, the first insulating plate 810 has a clearance opening for the connecting busbar 300 to pass through and connect to the connecting bar, without affecting the electrical connection between the connecting busbar 300 and external electrical components.

[0096] Of course, if the second side panel 120 is not an acrylic plate and does not require the pressure plate 700 to press it, for example, if the second side panel 120 is an insulating plate, the box 100 may not have the first insulating plate 810. The first insulating plate 810 can be designed accordingly as needed.

[0097] Furthermore, such as Figure 6 and Figure 7 As shown, the enclosure 100 may further include a second insulating plate 820 and a third insulating plate 830, respectively disposed on the upper outer side and lower outer side of the second side plate 120. Here, the second insulating plate 820 and the third insulating plate 830 can also serve as electrical isolation to prevent the connecting busbar 300 from generating electromagnetic effects on surrounding metal parts.

[0098] In the case where the enclosure 100 also includes a first insulating plate 810, the first insulating plate 810 can be placed outside the second insulating plate 820 and the third insulating plate 830, providing protection at multiple positions (top, middle, and bottom) and good electrical isolation effect.

[0099] Furthermore, to enhance electrical isolation, the lengths of both the second insulating plate 820 and the third insulating plate 830 are extended to be as close as possible to the connecting busbar 300. However, to allow users to see the light-transmitting part through the window 730 of the pressure plate 700, and subsequently the interior of the enclosure 100, the second insulating plate 820 and the third insulating plate 830 need to avoid the window 730. Figure 6 and Figure 7 In the middle, the second insulating plate 820 and the third insulating plate 830 avoid the window 730 and respectively cover the upper outer side and lower outer side of the second side plate 120.

[0100] Furthermore, such as Figure 6 and Figure 7 As shown, the enclosure 100 may also include a fourth insulating plate 840 and a fifth insulating plate 850, which are respectively disposed on the outside of the third side plate 130 and the fourth side plate 140 of the enclosure 100 and extend to the end where the busbar 300 is located.

[0101] The connecting end of the busbar 300 extending beyond the enclosure 100 can easily exceed both sides of the enclosure 100, which can easily cause electromagnetic interference to the third side panel 130 and the fourth side panel 140, especially when the third side panel 130 and the fourth side panel 140 are metal plates. Therefore, a fourth insulating plate 840 and a fifth insulating plate 850 are respectively placed on the outer side of the third side panel 130 and the end near the connecting busbar 300 to provide electrical isolation and prevent the connecting busbar 300 from causing electromagnetic effects on the third side panel 130 and the fourth side panel 140.

[0102] In some embodiments, the lengths of the fourth insulating plate 840 and the fifth insulating plate 850 may be longer than the DC busbar to ensure electrical isolation.

[0103] Of course, if the first side plate 110 is an insulating plate and the width of the connecting busbar 300 is less than the width of the first side plate 110, then electrical isolation is not required. In this case, the enclosure 100 may not be equipped with the fourth insulating plate 840 and the fifth insulating plate 850, and the design can be made according to the specific situation.

[0104] Furthermore, in some embodiments, such as Figure 6 and Figure 7 As shown, the enclosure 100 is also equipped with a spool vent for evacuating the housing. This allows air to be extracted from the housing before the power module is put into operation, creating a vacuum state for testing. This facilitates testing of the insulation performance, sealing performance, and operational reliability of the enclosure 100, effectively preventing current leakage and ensuring the insulation reliability between components.

[0105] As an example, such as Figure 6 and Figure 7 As shown, the axial air port is located at the bottom of the second side plate 120 for easy air extraction. Of course, the air extraction port 122 can also be located in other positions.

[0106] Furthermore, in some embodiments, the enclosure 100 is also provided with at least one monitoring device mounting port to facilitate the installation of a monitoring device to monitor the enclosure 100.

[0107] As an example, the monitoring device mounting ports may include, but are not limited to, safety valve mounting ports, liquid level sensor mounting ports, pressure sensor mounting ports, and temperature sensor mounting ports provided on the top plate 150 of the housing 100, which facilitates the installation of safety valve 860, liquid level sensor 870, pressure sensor 880, and temperature sensor 890 on the top of the housing 100.

[0108] Furthermore, such as Figure 6As shown, the power module assembly may include a safety valve 860, which is located at the safety valve mounting port of the housing 100. The safety valve 860 is used to release pressure when the pressure inside the housing reaches a set pressure, and to close when the pressure inside the housing does not reach the set pressure. This prevents excessive pressure inside the housing 100 and ensures the safety of the power module assembly.

[0109] The power module assembly may also include a liquid level sensor 870, which is installed at the liquid level sensor mounting port of the housing 100 and is used to detect the liquid level of the phase change cooling medium in the containment cavity. This facilitates timely understanding of the liquid level of the phase change cooling medium, allowing for timely replenishment or discharge of the phase change cooling medium into or out of the containment cavity.

[0110] For example, the liquid level sensor 870 can be used to monitor whether the liquid level of the phase change cooling medium in the containment cavity has reached a first set height, such as whether it exceeds the top of the power module. If it has not reached the first set height, the power module is not immersed in the phase change cooling medium, and the phase change cooling medium can be added to the housing 100. The liquid level sensor 870 can also be used to monitor whether the liquid level of the phase change cooling medium in the containment cavity has reached a second set height. The second set height is higher than the first set height. If the phase change cooling medium reaches the second set height, the liquid level is too high, and it may even reach the top of the housing 100. After evaporating into a gaseous state, it will cause excessive gas pressure, and the gas will not be easy to circulate or be discharged. In this case, a portion of the phase change cooling medium in the containment cavity can be discharged.

[0111] Therefore, the power module assembly may also include a storage tank, which is connected to the receiving cavity of the housing 100, for storing phase change cooling medium. When the phase change cooling medium in the housing 100 is below a first preset height, the tank 100 is replenished with phase change cooling medium; conversely, when the phase change cooling medium in the housing 100 is above a second preset height, the tank is discharged from the storage tank. This ensures effective operation of evaporative cooling while avoiding waste of the phase change cooling medium.

[0112] The power module assembly may also include a pressure sensor 880, located at the pressure sensor mounting port of the housing 100, for monitoring the gas pressure within the containment cavity. Specifically, the pressure sensor 880 can be used to detect whether the pressure within the containment cavity has reached the set operating pressure, thereby ensuring that the phase change cooling medium undergoes phase change cooling at the set operating pressure. If the pressure within the containment cavity does not reach the operating pressure or exceeds the operating pressure, the height of the phase change cooling medium can be adjusted or gas can be introduced into the containment cavity to ensure that the phase change cooling medium undergoes phase change at the operating pressure.

[0113] The power module assembly may also include a temperature sensor 890, located at the temperature sensor mounting port of the housing 100, for monitoring the temperature of the phase change cooling medium within the containment cavity. This allows for timely monitoring of temperature changes in the phase change cooling medium, such as detecting whether the evaporation temperature of the phase change cooling medium is within the set temperature, thereby ensuring effective cooling of the phase change cooling medium.

[0114] The monitoring device mounting port can be used to install different monitoring devices, not limited to the examples above.

[0115] Furthermore, in some embodiments, such as Figures 10 to 13 As shown, a first mounting bracket 170 is provided on the inner surface of the bottom plate 160 of the enclosure 100, which is used to connect to the top of the power module; a second mounting bracket 180 is provided on the inner surface of the side plate of the enclosure 100, which is used to connect to the bottom of the power module. Thus, the first mounting bracket 170 and the second mounting bracket 180 can be used to effectively support the power module.

[0116] The second mounting bracket 180 can be set on two opposite side plates of the housing 100, such as the third side plate 130 and the fourth side plate 140, or it can be set on the first side plate 110 and the second side plate 120. Alternatively, each side plate can be provided with a second mounting bracket 180 to stably connect the power module.

[0117] The first mounting bracket 170 can be welded to the inner surface of the base plate 160 of the enclosure 100. This ensures the secure installation of the first mounting bracket 170, thus facilitating stable support of the power module. Furthermore, it eliminates the need for an opening in the base plate 160 to connect the first mounting bracket 170, avoiding sealing issues. Of course, the first mounting bracket 170 can also be fixed to the side plate in other ways.

[0118] The second mounting bracket 180 can also be welded to the inner surface of the side plate of the housing 100. This ensures the secure installation of the second mounting bracket 180, thus facilitating stable support of the power module. Furthermore, it eliminates the need for openings in the side plate to connect the second mounting bracket 180, avoiding sealing issues. Alternatively, the second mounting bracket 180 can also be fixed to the base plate 160 in other ways.

[0119] Of course, a third mounting bracket (not shown in the figure) can also be provided on the inner surface of the top plate 150 of the enclosure 100. The third mounting bracket can also be used to connect with the power module to achieve multi-directional fixation of the power module.

[0120] The first and second mounting brackets can be raised ribs, which provide structural strength and facilitate the connection of the power module without affecting the enclosure 100.

[0121] The first and second mounting brackets can also be structures such as threaded columns, which will not be listed in detail here.

[0122] As an example, the power module may include a support frame 190 and an IGBT 200 disposed on the support frame 190, such as Figures 10 to 13 As shown, the bottom of the support frame 190 may have a bent and extended first connecting portion 191, and the top of the support frame 190 may have a bent and extended second connecting portion 192. The power modules can be arranged in two rows and supported by two support frames 190 or one support frame 190. Each support frame 190 has a corresponding IGBT mounting area. Therefore, the first connecting portions 191 at the bottom of the two support frames 190 can extend away from each other, and the second connecting portions 192 at the top of the two support frames 190 can extend away from each other. The first connecting portion 191 and / or the second connecting portion 192 may be provided with through holes 193 to facilitate the circulation of the phase change cooling medium within the receiving cavity.

[0123] The inner surfaces of the third side plate 130 and the fourth side plate 140 are each provided with a second mounting bracket 180, so that the second connecting parts 192 of the two support frames 190 are respectively fixedly connected to the adjacent second mounting bracket 180. Specifically, bolts can be inserted into the first mounting bracket 170 through the first connecting part 191 to fix the bottom of the power module.

[0124] The number of first mounting brackets 170 can also be two, each located below a corresponding support frame 190 and connected to the first connecting portion 191 of the adjacent support frame 190. Alternatively, the number of first mounting brackets 170 can be one, with the bottom of both support frames 190 connected to this single first mounting bracket 170. Specifically, bolts can be inserted into the second mounting bracket 180 through the second connecting portion 192 to secure the top of the power module.

[0125] Of course, the power module can also be connected to the mounting bracket without bolts. They can also be connected by clips, pins, welding, or other methods, which will not be listed in detail here.

[0126] In addition, the power module may include other electrical components that can be integrated into the support frame 190 and thus secured in the housing 100 via the first mounting bracket 170 and the second mounting bracket 180.

[0127] As an example, such as Figure 9 As shown, the power module may also include a resistor 900, one side of which has an upwardly extending third connection portion 910. A bolt passes through the third connection portion 910 and is inserted into the support frame 190, thereby fixing the resistor 900.

[0128] Furthermore, in some embodiments, such as Figure 7 As shown, the outer surface of the box 100 is also provided with reinforcing ribs 131 to increase the structural strength of the box 100 and prevent the box 100 from deforming.

[0129] Of course, in other embodiments, the cavity can also be filled with other cooling media, not limited to the phase change coolant described above. For example, water or other liquid cooling media can be used. The power module is immersed in the liquid cooling media, and cooling is achieved through heat exchange between the liquid cooling media and the power module. The heated liquid cooling media flows out of the cavity, while a lower-temperature liquid cooling media is added to the cavity, circulating through the power module for cooling. In this case, the connecting busbar 300 and the housing 100 of the above embodiment can also be used, which can similarly prevent the liquid cooling media from leaking out through the first connecting hole 111.

[0130] A third aspect of this utility model provides a converter, which includes: a power module assembly as provided in any of the above embodiments; and a condenser, wherein the inlet of the condenser is connected to the outlet 151 of the housing 100, and the outlet of the condenser is connected to the liquid inlet 121 of the housing 100, for condensing the evaporated phase change cooling medium flowing out from the containment cavity.

[0131] The converter provided in this embodiment can use a condenser to condense the phase change cooling medium from a gaseous state into a liquid state, and then return it to the receiving cavity of the housing 100 through the liquid inlet 121. The phase change cooling medium can be recycled, saving raw materials and reducing costs. Moreover, the phase change cooling system has a simple structure.

[0132] Furthermore, the condenser can be installed at the top of the housing 100, allowing the phase change cooling medium, which evaporates into a gaseous state, to rise naturally into the condenser for condensation.

[0133] Of course, the condenser can also be set on one side or at the bottom of the housing 100 in the horizontal direction, so that a pump can be configured to deliver the gaseous phase change cooling medium discharged from the outlet 151 to the condenser.

[0134] In addition, if the containment cavity does not contain a phase change coolant, but rather a liquid cooling medium such as water, and the power module temperature is reduced simply by exchanging heat with the power module, the converter may not have the aforementioned condenser, but may include other heat dissipation devices. These other heat dissipation devices can be used to cool the higher-temperature liquid cooling medium flowing out of the containment cavity, and then the cooled liquid cooling medium can be returned to the containment cavity.

[0135] A fourth aspect of this utility model provides a wind turbine generator set, including a power module assembly as provided in the second aspect of the above-described embodiment or a converter as provided in the third aspect of the above-described embodiment.

[0136] The wind turbine generator set provided in this embodiment has the power module assembly provided in the second aspect embodiment or the converter provided in the third aspect embodiment, and thus has the beneficial effects of the second aspect embodiment or the third aspect embodiment, which will not be repeated here.

[0137] Furthermore, the wind turbine generator set also includes a tower and a nacelle located on top of the tower. The converter can be located inside the tower or inside the nacelle.

[0138] While the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope thereof. It should be understood that, to those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention as defined in the claims.

Claims

1. A connecting busbar, characterized in that, The connecting busbar (300) includes a busbar main board (310) and connecting terminals extending outward from the busbar main board (310). The connecting terminal (320) includes a column section (322), a first connecting section (321) located at a first end of the column section (322), and a second connecting section (323) located at a second end of the column section (322). The second connecting section (323) is used for connecting to a cable.

2. The connecting busbar according to claim 1, characterized in that, The connecting terminal (320) is bent at a preset angle relative to the busbar main board (310).

3. The connecting busbar according to claim 1, characterized in that, The cross-section of the column segment (322) is circular or elliptical.

4. The connecting busbar according to claim 1, characterized in that, The column segment (322), the first connecting segment (321), and the second connecting segment (323) are integrally formed; or At least one of the first connecting segment (321) and the second connecting segment (323) is plugged into the column segment (322).

5. A power module assembly, characterized in that, The power module assembly includes: The box (100) has a receiving cavity, and the box wall of the box (100) is provided with a first connecting hole (111) connecting the receiving cavity and the outside. The power module is disposed in the receiving cavity; As described in any one of claims 1-4, the connecting busbar (300) has a connecting terminal (320) inserted into the first connecting hole (111) and electrically connected to the power module, wherein the connecting terminal (320) is sealed to the first connecting hole (111) through the column section (322).

6. The power module assembly according to claim 5, characterized in that, The power module assembly also includes a sealing ring (400), which is fitted around the outer periphery of the cylindrical section (322) or at the edge of the first connecting hole (111) to seal the gap between the cylindrical section (322) and the first connecting hole (111); and / or The shape of the first connecting hole (111) is adapted to the shape of the column section (322).

7. The power module assembly according to claim 5, characterized in that, The power module includes IGBTs (200).

8. The power module assembly according to claim 5, characterized in that, The cavity is filled with a phase change cooling medium, and the power module is immersed in the phase change cooling medium.

9. The power module assembly according to claim 8, characterized in that, At least a portion of the wall of the box (100) is a light-transmitting part.

10. The power module assembly according to claim 8, characterized in that, The top of the housing (100) has an air outlet (151) communicating with the receiving cavity, and the air outlet (151) is used to discharge the phase change cooling medium that has changed to a gaseous state. The housing (100) also has a liquid inlet (121) communicating with the receiving cavity, the liquid inlet (121) being used to supply liquid phase change cooling medium.

11. A converter, characterized in that, The converter includes: The power module assembly as described in any one of claims 5 to 10; and The condenser has an inlet connected to the outlet (151) of the housing (100) and an outlet connected to the liquid inlet (121) of the housing (100), and is used to condense the evaporated phase change cooling medium flowing out of the containment cavity.

12. A wind turbine generator set, characterized in that, Includes the power module assembly as described in any one of claims 5 to 10 or the converter as described in claim 11.

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