Power conversion device, converter valve and energy storage system
By employing a positioning groove design in the power conversion device, the power devices and heat sinks can be positioned quickly and accurately, solving the problems of low assembly efficiency and large center alignment error, and achieving more efficient assembly and more uniform pressure on the pressing surface.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2026-03-31
AI Technical Summary
Existing power conversion devices suffer from low assembly efficiency during the assembly process. In particular, the inability to visually observe the assembly status of the components leads to large center alignment errors, resulting in uneven stress on the pressing surface.
Design a power conversion device in which the power device and the heat sink cooperate through positioning grooves to form a fast and accurate positioning relationship, ensuring concentric setting and reducing center alignment error.
It improves assembly accuracy and efficiency, ensures a tight fit between power devices and heat sinks, and ensures uniform stress on the pressing surface, thereby enhancing the assembly effect.
Smart Images
Figure CN224068528U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power output technology, and in particular to a power conversion device, a converter valve, and an energy storage system. Background Technology
[0002] The statements herein are provided only as background information in connection with this application and do not necessarily constitute prior art.
[0003] Power electronic devices are the core of modern power electronics technology. Currently, high-voltage, high-power devices (such as diodes, thyristors, IGBTs, IGCTs, etc.) mainly adopt two packaging types: modular and press-fit.
[0004] Press-fit packaging can form a power conversion device, which is generally assembled from two or more high-power devices arranged in parallel and water-cooled heat sinks arranged interspersed with the power devices. However, it suffers from low assembly efficiency. Utility Model Content
[0005] In view of the problem, this application provides a power conversion device, a converter valve, and an energy storage system, which can alleviate the problem of low assembly efficiency of the power conversion device.
[0006] In a first aspect, this application provides a power conversion device, including multiple power devices and multiple heat sinks, wherein all power devices and all heat sinks are alternately stacked on top of each other along a preset direction;
[0007] In this embodiment, at least one heat sink has a first positioning groove on the side facing the adjacent power device, at least a portion of the power device is placed within the first positioning groove and mates with the first positioning groove; and / or
[0008] At least one power device has a second positioning groove on the side facing the adjacent heat sink, and at least a portion of the heat sink is placed in and mates with the second positioning groove.
[0009] The aforementioned power conversion device, because the power device itself mates with the first positioning groove of the heat sink, or the heat sink itself mates with the second positioning groove of the power device, allows for direct observation of the positioning accuracy during assembly. Furthermore, since the mating parts are relatively large, it improves both assembly accuracy and assembly efficiency.
[0010] In some embodiments, when the heat sink has a first positioning groove, the power device has a first mating end face and a first mating peripheral face. The first mating end face is located at one end of the power device along a preset direction, and the first mating peripheral face is located on the outer periphery of the power device and is connected to the outer edge of the first mating end face. The first mating end face is in contact with the bottom wall of the first positioning groove, and the first mating peripheral face is in contact with the side wall of the first positioning groove.
[0011] The first mating end face of the power device can contact the bottom wall of the first positioning groove, thereby abutting the power device and the heat sink to form a positioning relationship in the stacking direction. The first mating peripheral surface is the surface directly connected to the outer edge of the first mating end face. Therefore, when the first mating peripheral surface contacts the side wall of the first positioning groove, the two can form a positioning relationship in the direction perpendicular to the stacking direction. In this way, the power device and the heat sink can be positioned quickly and accurately.
[0012] In some embodiments, when the power device has a second positioning groove, the heat sink has a second mating end face and a second mating peripheral face. The second mating end face is located at one end of the heat sink along a preset direction, and the second mating peripheral face is located on the outer periphery of the heat sink and is connected to the outer edge of the second mating end face. The second mating end face is in contact with the bottom wall of the second positioning groove, and the second mating peripheral face is in contact with the side wall of the second positioning groove.
[0013] The second mating end face of the heat sink can contact the bottom wall of the second positioning groove, thereby allowing the power device and the heat sink to abut against each other to form a positioning relationship in the stacking direction. The second mating peripheral surface is a surface directly connected to the outer edge of the second mating end face. Therefore, when the second mating peripheral surface contacts the side wall of the second positioning groove, the two can form a positioning relationship in a direction perpendicular to the stacking direction. In this way, the power device and the heat sink can be positioned quickly and accurately.
[0014] In some embodiments, when the radiator has a first positioning groove, the centerline of the radiator coincides with the centerline of the first positioning groove, and the centerlines of all the first positioning grooves coincide.
[0015] When the first positioning groove mates with at least a portion of the power device, the centerline of the power device can coincide with the centerline of the first positioning groove, and thus with the centerline of the heat sink. Since the centerlines of all the first positioning grooves coincide, the centerlines of each heat sink can also coincide with the centerlines of all the mating power devices. All heat sinks and all power devices are concentrically arranged, thus reducing the center alignment error of the power conversion device, making the pressure surface of the power device more uniform, and improving the pressure bonding effect.
[0016] In some embodiments, when the power device has a second positioning groove, the centerline of the power device coincides with the centerline of the second positioning groove, and the centerlines of all the second positioning grooves coincide.
[0017] When the second positioning groove mates with at least a portion of the heat sink, the centerline of the heat sink can coincide with the centerline of the second positioning groove, and thus with the centerline of the power device. Since the centerlines of all the second positioning grooves coincide, the centerlines of each power device can also coincide with the centerlines of all the mate heat sinks. All power devices and all heat sinks are concentrically arranged, thus reducing the center alignment error of the power conversion device, making the pressure surface of the power device more uniform, and improving the pressure bonding effect.
[0018] In some embodiments, when the heat sink has a first positioning groove and the power device has a second positioning groove, the centerline of the heat sink coincides with the centerline of the first positioning groove, the centerline of the power device coincides with the centerline of the second positioning groove, and the centerlines of all the first positioning grooves coincide with the centerlines of all the second positioning grooves.
[0019] Thus, when the first positioning groove mates with at least a portion of the power device, the centerline of the power device coincides with the centerline of the first positioning groove, and subsequently with the centerline of the heat sink. When the second positioning groove mates with at least a portion of the heat sink, the centerline of the heat sink coincides with the centerline of the second positioning groove, and subsequently with the centerline of the power device. Since the centerlines of all the first positioning grooves coincide with the centerlines of the second positioning grooves, the centerlines of each power device also coincide with the centerlines of all the mating heat sinks. This achieves concentric alignment between all power devices and all heat sinks, thereby reducing the center alignment error of the power conversion device, resulting in more uniform force on the pressing surface of the power device and a better pressing effect.
[0020] In some embodiments, when the heat sink has a first positioning groove, the sum of the maximum distances between any two power devices and the center line of the first positioning groove does not exceed 1.5 mm.
[0021] When power devices are positioned using the first positioning groove of the heat sink, due to machining errors in the first positioning groove or the power device itself, there may be some offset between the part of the power device placed in the first positioning groove and the first positioning groove. This causes the centerline of the power device to not coincide with the centerline of the first positioning groove. Therefore, it is necessary to set the maximum distance between any two power devices and the centerline of the first positioning groove to not exceed 1.5 mm. This reduces the center alignment error of the power conversion device, resulting in more uniform force on the pressing surface of the power device and better pressing effect.
[0022] In some embodiments, when the power device has a second positioning groove, the sum of the maximum distances between any two heat sinks and the center line of the second positioning groove does not exceed 1.5 mm.
[0023] When the heat sink is positioned using the second positioning groove of the power device, due to machining errors in either the second positioning groove or the heat sink, there may be some offset between the part of the heat sink placed in the second positioning groove and the groove itself. This can cause the centerline of the heat sink to not coincide with the centerline of the second positioning groove. Therefore, it is necessary to ensure that the sum of the maximum distances between any two heat sinks and the centerline of the second positioning groove does not exceed 1.5 mm. This reduces the center alignment error of the power conversion device, resulting in more uniform force on the pressing surface of the power device and a better pressing effect.
[0024] In some embodiments, when the heat sink has a first positioning groove, the number of first positioning grooves that cooperate with all power devices is N1, the inner diameter of the first positioning groove is d1, and the outer diameter of the portion of the power device that cooperates with the first positioning groove is d2; wherein, d2<d1≤d2+1.5 / N1.
[0025] By designing the inner diameter of the first positioning groove to be d2<d1≤d2+1.5 / N1, the total cumulative error generated by N1 mating operations does not exceed 1.5 mm. Therefore, it can be ensured that the sum of the maximum distances between any two power devices and the center line of the first positioning groove does not exceed 1.5 mm.
[0026] In some embodiments, when the power device has a second positioning groove, the number of second positioning grooves that cooperate with all heat sinks is N2, the inner diameter of the second positioning groove is d3, and the outer diameter of the portion of the heat sink that cooperates with the second positioning groove is d4; wherein, d4<d3≤d4+1.5 / N2.
[0027] By designing the inner diameter of the second positioning groove to be d4<d3≤d4+1.5 / N2, the total cumulative error generated by N2 fits is ensured to be no more than 1.5 mm, thus ensuring that the sum of the maximum distances between any two heat sinks and the center line of the second positioning groove is no more than 1.5 mm.
[0028] In some embodiments, when the heat sink has a first positioning groove, the first positioning groove is a milled groove.
[0029] Since radiators are usually made of metal and their internal structure is relatively complex due to the arrangement of cooling channels, milling can make the machining of the slots easier.
[0030] In some embodiments, the power conversion device further includes a first clamp, a second clamp, and a disc spring. The first clamp and the second clamp are arranged opposite to each other and spaced apart along a preset direction. All power devices and all heat sinks are clamped between the first clamp and the second clamp. The disc spring is compressed between the first clamp and the power device or heat sink closest to the first clamp.
[0031] The first and second clamps can limit all power devices, all heat sinks, and disc springs located between them in a preset direction and generate clamping force. In addition, since the disc springs are compressed, the pressure generated by the deformation can be applied to all power devices and all heat sinks to make all power devices and all heat sinks fit together tightly.
[0032] In some embodiments, the power conversion device further includes multiple tie rods, with the first clamp and the second clamp connected by the tie rods, and all the tie rods arranged at intervals around the power device and the heat sink.
[0033] The pull rod can limit the distance between the first clamp and the second clamp, and can resist the elastic restoring force of the disc spring to keep all power devices and all heat sinks in close contact.
[0034] Secondly, a converter valve is provided, including the power conversion device in any of the above embodiments.
[0035] The aforementioned converter valve, because the power conversion device uses the power device itself to cooperate with the first positioning groove of the heat sink, or the heat sink itself to cooperate with the second positioning groove of the power device, allows for direct observation of the positioning accuracy during assembly. Furthermore, since the size of the cooperating part is also relatively large, it improves both assembly accuracy and assembly efficiency.
[0036] Thirdly, an energy storage system is also provided, including the power conversion device in any of the above embodiments.
[0037] In the aforementioned energy storage system, since the power conversion device is connected to the first positioning groove of the heat sink, or the heat sink is connected to the second positioning groove of the power device, the positioning accuracy can be visually observed during assembly. Furthermore, since the size of the mating parts is relatively large, the assembly accuracy and efficiency are both improved.
[0038] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description
[0039] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0040] Figure 1 This is a schematic diagram of a power conversion device according to one or more embodiments.
[0041] Figure 2 This is an exploded structural diagram of a heat sink and power device according to one or more embodiments.
[0042] Figure 3 for Figure 2 The power device shown is a side view.
[0043] Figure 4 for Figure 2 The top view of the power device shown.
[0044] The reference numerals in the detailed embodiments are as follows:
[0045] Power conversion device 100, power device 10, diode 11, IGBT device 12, first mating end face 13, first mating peripheral face 14, heat sink 20, first positioning groove 21, first clamp 30, second clamp 40, disc spring 50, pull rod 60, first pressure bearing member 70, second pressure bearing member 80. Detailed Implementation
[0046] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0048] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0050] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, 1 and / or 2 can represent: 1 existing alone, 1 and 2 existing simultaneously, and 2 existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.
[0051] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).
[0052] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0053] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0054] Both DC transmission systems and energy storage systems require power devices to achieve the conversion, control, and management of electrical energy. Specifically, the core equipment in a DC transmission system is the converter valve in the converter station. The converter valve consists of a series of converter valve units, which precisely control the switching on and off of power devices (such as insulated-gate bipolar transistors, IGBTs) to achieve the conversion between AC and DC power. In high-voltage transmission, power devices not only convert the form of electrical energy but also undertake important functions such as voltage regulation, current control, and power management. In energy storage systems, power devices can form half-bridge or full-bridge circuits within the energy storage valve submodules to create power conversion devices. These power conversion devices enable the activation and deactivation of the energy storage valve submodules, allowing the battery to charge when there is excess grid energy and the battery to discharge and supplement the grid when there is insufficient grid energy.
[0055] In related technologies, power conversion devices are generally composed of multiple power devices, insulation devices, voltage divider resistors, upper and lower base plates, and heat sinks, all crimped together. Due to installation errors during the assembly of the power devices, heat sinks, and upper and lower base plates, their central axes cannot be properly aligned during crimping. This results in a large centering error in the power conversion device, uneven stress on the crimping surfaces of high-power devices, and negatively impacts the crimping effect.
[0056] To reduce the centering error of power conversion devices, related technologies have proposed creating locating pin holes on the surfaces of power devices and heat sinks, and using locating pins to engage with these holes to ensure concentricity. However, because the locating pins and holes are small in size and located at the center of the device during assembly, they cannot be visually observed, resulting in low assembly efficiency of the power conversion device.
[0057] To alleviate the problem of low assembly efficiency of power conversion devices in related technologies due to the inability to visually observe the assembly of components, this application provides a power conversion device including multiple power semiconductor devices and multiple heat sinks. All power devices and heat sinks are alternately stacked along a predetermined direction. At least one heat sink has a first positioning groove on the side facing an adjacent power device, and at least a portion of the power device is placed within and engages with the first positioning groove; and / or at least one power device has a second positioning groove on the side facing an adjacent heat sink, and at least a portion of the heat sink is placed within and engages with the second positioning groove.
[0058] Since the power device itself mates with the first positioning groove of the heat sink, or the heat sink itself mates with the second positioning groove of the power device, the positioning accuracy can be visually observed during assembly. Furthermore, since the size of the mating parts is also relatively large, the assembly accuracy and efficiency are both improved.
[0059] The power conversion device of this application can be applied to the power conversion equipment of converter valves or energy storage systems to alleviate the problem of low assembly efficiency of power conversion devices due to the inability to visually observe the assembly status of components.
[0060] The converter valve disclosed in this application can be used, but is not limited to, in DC transmission systems such as flexible DC transmission systems or conventional DC transmission systems.
[0061] The energy storage system disclosed in this application may include one or more energy storage devices and a power conversion system (PCS). The power conversion system is used to connect the power generation device and the energy storage device. The power conversion system includes the aforementioned power conversion device. The power generation device generates electrical energy, which can be stored in the energy storage device via the power conversion system. The stored electrical energy can also be released back to the power generation device via the power conversion system. As examples, the power generation device may specifically be a power grid, solar panels, hydroelectric power generation equipment, thermal power generation equipment, wind power generation equipment, etc. The specific type of power generation device is not limited in this application.
[0062] Figure 1 This is a schematic diagram of a power conversion device according to one or more embodiments. Figure 2 This is an exploded structural diagram of a heat sink and power device according to one or more embodiments. Referring to the accompanying drawings, an embodiment of this application provides a power conversion device 100, including a plurality of power devices 10 and a plurality of heat sinks 20, wherein all power devices 10 and all heat sinks 20 are alternately stacked along a predetermined direction. At least one heat sink 20 has a first positioning groove 21 on the side facing an adjacent power device 10, and at least a portion of the power device 10 is placed within and engages with the first positioning groove 21. And / or at least one power device 10 has a second positioning groove on the side facing an adjacent heat sink 20, and at least a portion of the heat sink 20 is placed within and engages with the second positioning groove.
[0063] The power device 10, also known as a power semiconductor device, can form a half-bridge circuit or a full-bridge circuit in the power conversion equipment of a converter valve or energy storage system. Specifically, the power device 10 may include one of a unidirectional conducting transistor 11, an IGBT device 12, or a thyristor.
[0064] A heat sink 20 refers to a device that can dissipate heat and cool external components. The heat dissipation method of the heat sink 20 is usually liquid cooling. Specifically, the heat sink 20 may include a heat sink plate with multiple heat dissipation channels for the flow of cooling medium.
[0065] The preset direction in which all power devices 10 and all heat sinks 20 are alternately stacked along a preset direction can be the axial direction when the power device 10 is disc-shaped, or it can be understood as the thickness direction of the power device 10. Taking a half-bridge circuit as an example, the power conversion device 100 includes two unidirectional conducting diodes 11, two IGBT devices 12, and five heat sinks 20. The two unidirectional conducting diodes 11, two IGBT devices 12, and five heat sinks 20 are alternately stacked along the axial direction, wherein each unidirectional conducting diode 11 and each IGBT device 12 has a heat sink 20 on both sides. It can be understood that the number of heat sinks 20 can vary depending on the type of circuit formed by the power devices 10.
[0066] The first positioning groove 21 is formed by recessing the surface of the heat sink 20 facing the adjacent power device 10 in a direction away from the power device 10. The second positioning groove is formed by recessing the surface of the power device 10 facing the adjacent heat sink 20 in a direction away from the heat sink 20.
[0067] When at least a portion of the power device 10 is placed within the first positioning groove 21, a portion of the power device 10 itself can form a mating relationship with the first positioning groove 21, thereby positioning the power device 10 relative to the heat sink 20. When at least a portion of the heat sink 20 is placed within the second positioning groove, a portion of the heat sink 20 itself can form a mating relationship with the second positioning groove, thereby positioning the heat sink 20 relative to the power device 10. Thus, when all the power devices 10 and all the heat sinks 20 are alternately stacked along a predetermined direction, positioning relationships can be formed between all the power devices 10 and all the heat sinks 20.
[0068] The power conversion device 100 of this application embodiment, since the power device 10 itself cooperates with the first positioning groove 21 of the heat sink 20, or the heat sink 20 itself cooperates with the second positioning groove of the power device 10, can intuitively observe whether the positioning is accurate when the two are assembled. Furthermore, since the size of the cooperating part is also large, the assembly accuracy is improved, and the assembly efficiency is also improved.
[0069] In one specific embodiment of this application, all heat sinks 20 have a first positioning groove 21 on the side facing the adjacent power device 10. At least a portion of the corresponding power device 10 is placed within the first positioning groove 21 and engages with it. That is, all positioning grooves are located on the heat sink 20, not on the power device 10. This reduces the impact on the structure of the power device 10 and improves its reliability. Furthermore, since the heat sink 20 is typically a metal component, forming the first positioning groove 21 on it is simpler and has little impact on the heat dissipation effect of the heat sink 20 in this application.
[0070] Combination Figure 3 and Figure 4 According to some embodiments of this application, when the heat sink 20 has a first positioning groove 21, the power device 10 has a first mating end face 13 and a first mating peripheral face 14. The first mating end face 13 is located at one end of the power device 10 along a preset direction, and the first mating peripheral face 14 is located on the outer periphery of the power device 10 and is connected to the outer edge of the first mating end face 13. The first mating end face 13 is in contact with the bottom wall of the first positioning groove 21, and the first mating peripheral face 14 is in contact with the side wall of the first positioning groove 21.
[0071] The first mating end face 13 refers to the surface located at the end of the power device 10, specifically the end face of one end of the power device 10 along its axial direction. This end face can be circular when the power device 10 is in a disc shape. The shape of the bottom wall of the first positioning groove 21 is adapted to the first mating end face 13, and can also be circular. The first mating peripheral surface 14 is the outer peripheral surface of the power device 10, which is arranged in a complete circle around the power device 10. In the embodiments of this application, the outer periphery of the power device 10 consists of multiple annular bodies, each annular body having an outer peripheral surface. The first mating peripheral surface 14 is the outer peripheral surface of one of the annular bodies, and the first mating peripheral surface 14 is in complete contact with the side wall of the first positioning groove 21.
[0072] The first mating end face 13 of the power device 10 can contact the bottom wall of the first positioning groove 21, thereby abutting the power device 10 and the heat sink 20 to form a positioning relationship in the stacking direction. The first mating peripheral surface 14 is a surface directly connected to the outer edge of the first mating end face 13. Therefore, when the first mating peripheral surface 14 contacts the side wall of the first positioning groove 21, the two can form a positioning relationship in the direction perpendicular to the stacking direction. In this way, the power device 10 and the heat sink 20 can be positioned quickly and accurately.
[0073] According to some embodiments of this application, when the power device 10 has a second positioning groove, the heat sink 20 has a second mating end face and a second mating peripheral face. The second mating end face is located at one end of the heat sink 20 along a preset direction, and the second mating peripheral face is located on the outer periphery of the heat sink 20 and is connected to the outer edge of the second mating end face. The second mating end face contacts the bottom wall of the second positioning groove, and the second mating peripheral face contacts the side wall of the second positioning groove.
[0074] The second mating end face of the heat sink 20 can contact the bottom wall of the second positioning groove, thereby abutting the power device 10 and the heat sink 20 to form a positioning relationship in the stacking direction. The second mating peripheral surface is a surface directly connected to the outer edge of the second mating end face. Therefore, when the second mating peripheral surface contacts the side wall of the second positioning groove, the two can form a positioning relationship in the direction perpendicular to the stacking direction. In this way, the power device 10 and the heat sink 20 can be positioned quickly and accurately.
[0075] According to some embodiments of this application, when the heat sink 20 has a first positioning groove 21, the center line of the heat sink 20 coincides with the center line of the first positioning groove 21, and the center lines of all the first positioning grooves 21 coincide.
[0076] When the first positioning groove 21 mates with at least a portion of the power device 10, the center line of the power device 10 can coincide with the center line of the first positioning groove 21, and further coincide with the center line of the heat sink 20. Since the center lines of all the first positioning grooves 21 coincide, the center lines of each heat sink 20 can also coincide with the center lines of all the mating power devices 10. All heat sinks 20 and all power devices 10 are concentrically arranged, thus reducing the center alignment error of the power conversion device 100, making the pressure on the pressing surface of the power device 10 more uniform, and improving the pressing effect.
[0077] According to some embodiments of this application, when the power device 10 has a second positioning groove, the center line of the power device 10 coincides with the center line of the second positioning groove, and the center lines of all the second positioning grooves coincide.
[0078] When the second positioning groove mates with at least a portion of the heat sink 20, the center line of the heat sink 20 can coincide with the center line of the second positioning groove, and thus coincide with the center line of the power device 10. Since the center lines of all the second positioning grooves coincide, the center lines of each power device 10 can also coincide with the center lines of all the mating heat sinks 20. All power devices 10 and all heat sinks 20 are concentrically arranged, thus reducing the center alignment error of the power conversion device 100, making the pressure surface of the power device 10 more uniformly stressed, and improving the pressure bonding effect.
[0079] According to some embodiments of this application, when the heat sink 20 has a first positioning groove 21 and the power device 10 has a second positioning groove, the center line of the heat sink 20 coincides with the center line of the first positioning groove 21, the center line of the power device 10 coincides with the center line of the second positioning groove, and the center lines of all the first positioning grooves 21 coincide with the center lines of all the second positioning grooves.
[0080] Thus, when the first positioning groove 21 engages with at least a portion of the power device 10, the centerline of the power device 10 coincides with the centerline of the first positioning groove 21, and further coincides with the centerline of the heat sink 20. When the second positioning groove engages with at least a portion of the heat sink 20, the centerline of the heat sink 20 coincides with the centerline of the second positioning groove, and further coincides with the centerline of the power device 10. Since the centerlines of all the first positioning grooves 21 coincide with the centerlines of the second positioning grooves, the centerlines of each power device 10 also coincide with the centerlines of all the engaging heat sinks 20. All power devices 10 and all heat sinks 20 are concentrically arranged, thereby reducing the center alignment error of the power conversion device 100, making the pressure on the pressing surface of the power device 10 more uniform, and improving the pressing effect.
[0081] According to some embodiments of this application, when the heat sink 20 has a first positioning groove 21, the sum of the maximum distances between any two power devices 10 and the center line of the first positioning groove 21 does not exceed 1.5 mm.
[0082] When the power device 10 is positioned by the first positioning groove 21 of the heat sink 20, due to the processing error of the first positioning groove 21 or the processing error of the power device 10, there will be some offset between the part of the power device 10 placed in the first positioning groove 21 and the first positioning groove 21. This will cause the center line of the power device 10 to not coincide with the center line of the first positioning groove 21. Therefore, it is necessary to set the maximum distance between any two power devices 10 and the center line of the first positioning groove 21 to not exceed 1.5 mm. In this way, the center alignment error of the power conversion device 100 can be reduced, so that the pressure surface of the power device 10 is subjected to more uniform force and the pressure effect is better.
[0083] Similarly, according to some embodiments of this application, when the power device 10 has a second positioning groove, the sum of the maximum distances between any two heat sinks 20 and the center line of the second positioning groove does not exceed 1.5 mm.
[0084] When the heat sink 20 is positioned by the second positioning groove of the power device 10, due to the processing error of the second positioning groove or the processing error of the heat sink 20, there will be some offset between the part of the heat sink 20 placed in the second positioning groove and the second positioning groove. This will cause the center line of the heat sink 20 to not coincide with the center line of the second positioning groove. Therefore, it is necessary to set the maximum distance between any two heat sinks 20 and the center line of the second positioning groove to not exceed 1.5 mm. In this way, the center alignment error of the power conversion device 100 can be reduced, so that the pressure on the pressing surface of the power device 10 is more uniform and the pressing effect is better.
[0085] According to some embodiments of this application, when the heat sink 20 has a first positioning groove 21, the number of first positioning grooves 21 that cooperate with all power devices 10 is N1, the inner diameter of each first positioning groove 21 is d1, and the outer diameter of each part of the power device 10 that cooperates with the first positioning groove 21 is d2, wherein d2<d1≤d2+1.5 / N1.
[0086] By designing the inner diameter of the first positioning groove 21 to be d2<d1≤d2+1.5 / N1, the total cumulative error generated by N1 mating operations does not exceed 1.5 mm. Therefore, it can be ensured that the sum of the maximum distances between any two power devices 10 and the center line of the first positioning groove 21 does not exceed 1.5 mm.
[0087] According to some embodiments of this application, when the power device 10 has a second positioning groove, the number of second positioning grooves that cooperate with all the heat sinks 20 is N2, the inner diameter of each second positioning groove is d3, and the outer diameter of each part of the heat sink 20 that cooperates with the second positioning groove is d4; wherein, d4<d3≤d4+1.5 / N2.
[0088] By designing the inner diameter of the second positioning groove to be d4<d3≤d4+1.5 / N2, the total cumulative error generated by N2 fits does not exceed 1.5 mm, ensuring that the sum of the maximum distances between any two heat sinks 20 and the center line of the second positioning groove does not exceed 1.5 mm.
[0089] In one specific embodiment, the positioning grooves of the power conversion device 100 are all formed on the heat sink 20, and are all first positioning grooves 21. Taking the power device 10 as an example, as described above, it is assumed that the outer diameter of the portion of the IGBT device 12 that mates with the heat sink 20 is 115 mm, named d21, and the outer diameter of the portion of the unidirectional conduction tube 11 that mates with the heat sink 20 is 125 mm, named d22. In the entire power conversion device 100, there are 4 first positioning grooves 21 mates between the heat sink 20 and the IGBT device 12, and 4 first positioning grooves 21 mates between the heat sink 20 and the unidirectional conduction tube 11. Therefore, the total number of first positioning grooves 21 mates with all heat sinks 20 is 8, i.e., N1=8. First, the inner diameter of the first positioning groove 21 of the heat sink 20 mates with the IGBT device 12 is designed, named d11, where 115 mm < d11 ≤ 115 mm + 1.5 / 8. The inner diameter of the first positioning groove 21 of the radiator 20 that cooperates with the unidirectional conduit 11 is named d12, wherein 125 mm < d12 ≤ 125 mm + 1.5 / 8.
[0090] Specifically, the inner diameter d11 of the first positioning groove 21 of each heat sink 20 that mates with the IGBT device 12 can be made equal, and the inner diameter d12 of the first positioning groove 21 of each heat sink 20 that mates with the unidirectional conduction tube 11 can be made equal. Therefore, d11 = 115.15 mm and d12 = 125.15 mm can be determined.
[0091] It is understood that, due to the different circuit types formed by the power devices 10, the outer diameter of the part of each device in the power device 10 that mates with the first positioning groove 21 of the heat sink 20 will be different. Therefore, in the embodiments of this application, the inner diameter of all the first positioning grooves 21 of the power conversion device 100 is not necessarily the same, and will be adjusted accordingly based on the difference in the specific outer diameter of the power device 10 that mates with it.
[0092] According to some embodiments of this application, when the heat sink 20 has a first positioning groove 21, the first positioning groove 21 is a milled groove.
[0093] The milled groove refers to the groove in the first positioning groove 21 that is machined by a milling process. Specifically, it can be formed by milling with a milling cutter.
[0094] Since the radiator 20 is usually made of metal and its internal structure is relatively complex due to the arrangement of cooling channels, milling can make the machining of the slot easier.
[0095] Please see Figure 1According to some embodiments of this application, the power conversion device 100 further includes a first clamp 30, a second clamp 40, and a disc spring 50. The first clamp 30 and the second clamp 40 are arranged opposite to each other and spaced apart along a preset direction. All power devices 10 and all heat sinks 20 are clamped between the first clamp 30 and the second clamp 40. The disc spring 50 is compressed between the first clamp 30 and the power device 10 or heat sink 20 closest to the first clamp 30.
[0096] The first clamp 30 and the second clamp 40 can limit all power devices 10, all heat sinks 20 and disc springs 50 located between them in a preset direction and generate clamping force. In addition, since the disc springs 50 are compressed, they can provide the pressure generated by deformation to all power devices 10 and all heat sinks 20 so that all power devices 10 and all heat sinks 20 fit together tightly.
[0097] Specifically, the first clamp 30 is plate-shaped, and the second clamp 40 is also plate-shaped. The plate-shaped clamps have a larger clamping area, which can cover the power device 10, heat sink 20 and disc spring 50, making the force on each component more even.
[0098] Furthermore, the power conversion device 100 also includes multiple pull rods 60, the first clamp 30 and the second clamp 40 are connected by the pull rods 60, and all the pull rods 60 are arranged at intervals around the power device 10 and the heat sink 20.
[0099] The pull rod 60 can limit the distance between the first clamp 30 and the second clamp 40, and can resist the elastic restoring force of the disc spring 50 so that all power devices 10 and all heat sinks 20 can be kept in close contact.
[0100] Specifically, one end of the pull rod 60 is threadedly connected to the second clamp 40, and the other end of the pull rod 60 is fixed to the first clamp 30 by bolts.
[0101] In some embodiments, the power conversion device 100 further includes a first pressure bearing member 70 and a second pressure bearing member 80. The first pressure bearing member 70 is located between the disc spring 50 and the power device 10 or heat sink 20 closest to the disc spring 50, and the second pressure bearing member 80 is located between the second clamp 40 and the power device 10 or heat sink 20 closest to the second clamp 40.
[0102] The first pressure-bearing component 70 and the second pressure-bearing component 80 are provided so that they can withstand the pressure of the external pressure device during the assembly of the power conversion device 100, thereby reducing the damage to the power device 10 and the heat sink 20 caused by the pressure.
[0103] Furthermore, the second pressure-bearing member 80 and the second clamping member 40 are positioned by a positioning pin. Specifically, the second pressure-bearing member 80 is provided with a first pin hole, and the second clamping member 40 is provided with a second pin hole. The first pin hole and the second pin hole are positioned correspondingly, and the positioning pin cooperates with the first pin hole and the second pin hole.
[0104] To better understand the implementation scheme of this application, the assembly process of the power conversion device 100 is described in detail below:
[0105] The first step is to assemble the first clamp 30, the pull rod 60, and the second clamp 40. The pull rod 60 is assembled with the second clamp 40 via threads, and then fixed to the first clamp 30 with bolts. A spirit level is used to check if the first clamp 30 and the second clamp 40 are level, ensuring that the lower surface of the first clamp 30 is parallel to the upper surface of the second clamp 40. A plumb line is then used to check if the centers of the first clamp 30 and the second clamp 40 are on the same vertical axis.
[0106] The second step is to assemble a limiting plate on the side of the second clamp 40, and fit the limiting plate well with the two sides of the second clamp 40, and connect them with bolts to limit the radiator 20.
[0107] The third step is to position and install the second pressure-bearing component 80 and the second clamping component 40 using positioning pins, and then install the bottom surface of the radiator 20 and the second pressure-bearing component 80.
[0108] The fourth step is to stack the components. Next, IGBT devices 12 are installed on the heat sink 20. Since the first positioning groove 21 has been pre-processed on the upper surface of the heat sink 20, the heat sink 20 can be directly installed with the IGBT devices 12 through the first positioning groove 21.
[0109] Then another heat sink 20 is stacked on the upper surface of the IGBT device 12;
[0110] Following the same method, the unidirectional conduction tube 11 and the heat sink 20 are stacked and then the IGBT device 12 and the heat sink 20 are stacked and installed.
[0111] Fifth step: Install the first pressure-bearing component 70 on the upper surface of the heat sink 20 at the top of the stacked components, and install the disc spring 50, etc. on the first pressure-bearing component 70;
[0112] The sixth step involves using a hydraulic device to pressurize the components, initially to a small pressure (e.g., 10kN), so that each component is under pressure and will not shift even with a small horizontal force. At this point, the limiting plate is removed. Then, the pressure is increased to the required level, and finally, a complete power conversion device 100 is assembled.
[0113] According to some embodiments of this application, refer to Figures 1-4 A converter valve is provided, including the power conversion device 100 in any of the above embodiments.
[0114] In addition, according to some embodiments of this application, an energy storage system is also provided, including the power conversion device 100 in any of the above embodiments.
[0115] The aforementioned converter valve and energy storage system, because the power device 10 itself is engaged with the first positioning groove 21 of the radiator 20, or the radiator 20 itself is engaged with the second positioning groove of the power device 10, allows for direct observation of the positioning accuracy during assembly. Furthermore, since the size of the engaging parts is also relatively large, this improves both assembly accuracy and assembly efficiency.
[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A power conversion device, characterized by, The application relates to a power device and a heat sink. The first positioning groove is arranged on one side of the heat sink facing the adjacent power device, and at least part of the power device is arranged in the first positioning groove and matched with the first positioning groove. The second positioning groove is arranged on one side of the power device facing the adjacent heat sink, and at least part of the heat sink is arranged in the second positioning groove and matched with the second positioning groove.
2. The power conversion device of claim 1, wherein, When the heat sink has the first positioning groove, the power device has a first matching end face and a first matching peripheral surface. When the power device has the second positioning groove, the heat sink has a second matching end face and a second matching peripheral surface.
3. The power conversion device of claim 1, wherein, When the heat sink has the first positioning groove, the center line of the heat sink coincides with the center line of the first positioning groove, and the center lines of all the first positioning grooves coincide. When the power device has the second positioning groove, the center line of the power device coincides with the center line of the second positioning groove, and the center lines of all the second positioning grooves coincide. When the heat sink has the first positioning groove and the power device has the second positioning groove, the center line of the heat sink coincides with the center line of the first positioning groove, the center line of the power device coincides with the second positioning groove, and the center lines of all the first positioning grooves coincide with the center lines of all the second positioning grooves.
4. The power conversion device of claim 3, wherein, When the heat sink has the first positioning groove, the sum of the maximum distances of any two power devices deviating from the center line of the first positioning groove is not more than 1.5 mm. When the power device has the second positioning groove, the sum of the maximum distances of any two heat sinks deviating from the center line of the second positioning groove is not more than 1.5 mm.
5. The power conversion device of claim 4, wherein, When the heat sink has the first positioning groove, the number of the first positioning grooves matched with all the power devices is N1, the inner diameter of the first positioning groove is d1, and the outer diameter of the part of the power device matched with the first positioning groove is d2; wherein d2 When the power device has the second positioning groove, the number of the second positioning grooves matched with all the heat sinks is N2, the inner diameter of the second positioning groove is d3, and the outer diameter of the part of the heat sink matched with the second positioning groove is d4; wherein d4 6. The power conversion device according to any one of claims 1 to 5, characterized by When the heat sink has the first positioning groove, the first positioning groove is a milled groove.
7. The power conversion device according to any one of claims 1 to 5, wherein The power conversion device further comprises a first clamp, a second clamp, and a disc spring, the first clamp and the second clamp are oppositely and spacedly arranged along the preset direction, all the power devices and all the heat sinks are clamped between the first clamp and the second clamp, and the disc spring is compressed between the first clamp and the power device or the heat sink closest to the first clamp.
8. The power conversion device of claim 7, wherein, The power conversion device further comprises a plurality of pull rods, the first clamp and the second clamp are connected through the pull rods, and all the pull rods are spacedly arranged around the power devices and the heat sinks.
9. A converter valve, characterized by A power conversion device comprising any one of claims 1-8.
10. An energy storage system characterized by, A power conversion device comprising any one of claims 1-8.