Fixing pressing block and power device assembly with same

Abstract

The utility model provides a fixed pressing block and a power device assembly with the same, and the fixed pressing block comprises a pressing block body which is provided with a first through hole, the pressing block body is provided with a first surface and a second surface which are oppositely arranged, and the first through hole penetrates through the pressing block body along the direction from the first surface to the second surface; the first reinforcing part is arranged on the first surface and annularly arranged on the periphery of the first penetrating hole; the second reinforcing part is located in the pressing block body, and the second reinforcing part is made of manganese steel materials. According to the scheme, the problem that the stability and the reliability of the power device assembly are affected due to the fact that cracks are easily generated at the penetrating holes of the fixed pressing block and even the fixed pressing block is broken in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power devices, in particular to a fixed pressing block and a power device component having the same. Background Art

[0002] In the field of electronic power technology, the heat dissipation efficiency of power devices is crucial to their performance and life. In order to improve the heat dissipation effect, it is usually necessary to fix the power device on the heat sink. The existing fixing method mostly uses a fixed pressure block and a fastener to press the power device on the heat sink.

[0003] During assembly, usually, the power device is placed on the heat sink, the fixed pressing block is pressed on the power device to fix the position of the power device relative to the heat sink, and the fastener is connected to the heat sink after passing through the hole to fix the fixed pressing block and the power device.

[0004] However, stress concentration is prone to occur at the location of the through holes. When the fixed pressure block is faced with changes in fastener torque, interference from external impacts, and the influence of thermal cycles and mechanical vibrations during the operation of the power device, the area around the through holes may become the origin of cracks, which in turn may cause cracks or even breakage in the fixed pressure block, affecting the stability and reliability of the entire power device assembly. Utility Model Content

[0005] The utility model provides a fixed pressing block and a power device assembly having the same, so as to solve the problem that cracks are easily generated at the penetration holes of the fixed pressing block in the prior art.

[0006] According to one aspect of the utility model, a fixed pressure block is provided, which includes: a pressure block body, which is provided with a first through hole, the pressure block body has a first surface and a second surface that are relatively arranged, and the first through hole penetrates the pressure block body along the direction from the first surface to the second surface; a first reinforcement portion, which is arranged on the first surface and is annularly arranged on the periphery of the first through hole; a second reinforcement portion, which is located in the pressure block body, wherein the second reinforcement portion is made of manganese steel material.

[0007] Furthermore, the first reinforcement portion includes a plurality of reinforcement ribs, and the plurality of reinforcement ribs are distributed in a circular shape along the circumference of the first penetration hole, and an angle is formed between two adjacent reinforcement ribs.

[0008] Furthermore, the first reinforcement portion includes two first reinforcement ribs and two second reinforcement ribs, and the first through hole is located in a space formed by the two first reinforcement ribs and the two second reinforcement ribs.

[0009] Furthermore, the first reinforcing rib extends along the width direction of the pressing block body, and two ends of the first reinforcing rib extend to two sides of the pressing block body respectively, and the second reinforcing rib is located between the two first reinforcing ribs.

[0010] Furthermore, the fixed pressing block further comprises: a positioning portion, which is arranged on the first surface, and extends along the width direction of the pressing block body, and a limiting space is formed between the positioning portion and the first reinforcing portion to limit the power device.

[0011] Further, the positioning portion includes a guiding inclined surface, and along the direction from the second surface to the first surface, the distance between the guiding inclined surface and the first reinforcing portion gradually increases.

[0012] Furthermore, the side wall width of the first reinforcement portion is smaller than the minimum width of the positioning portion.

[0013] Furthermore, the fixed pressing block also includes: an abutment protrusion, which is arranged on the first surface, the abutment protrusion is located between the positioning portion and the first reinforcement portion, the thickness of the abutment protrusion is respectively smaller than the thickness of the first reinforcement portion and the thickness of the positioning portion, and the abutment protrusion is used to abut against the power device.

[0014] Furthermore, the extending direction of the abutting protrusion is the same as the width direction of the fixed pressing block.

[0015] Furthermore, the second reinforcement portion includes a reinforcement sheet, on which a second penetration hole is provided, and the second penetration hole is coaxial with the first penetration hole.

[0016] According to another aspect of the utility model, a power device assembly is provided, comprising: a heat sink; a power device body, placed on the heat sink; the above-mentioned fixed pressing block, wherein the first surface of the fixed pressing block faces the power device body, and the fixed pressing block abuts against the power device body; a PCB board, arranged on the second surface of the fixed pressing block, and the pins of the power device body are fixed on the PCB board; a fastener, which passes through the first through-holes of the PCB board and the fixed pressing block in sequence and is connected to the heat sink, and the fastener cooperates with the fixed pressing block to fix the power device body on the heat sink.

[0017] By applying the technical solution of the utility model, when fixing the power device, the power device is placed on the heat sink, and then the fixed pressure block is pressed on the power device, and the fastener is passed through the first penetration hole and connected to the heat sink to achieve the fixation of the fixed pressure block and the power device. The force of the fastener is applied to the pressure block body, and the arrangement of the first reinforcement part and the second reinforcement part can reduce the stress concentration on the pressure block body. In addition, the high strength and toughness of manganese steel enable the second reinforcement part to effectively absorb and disperse stress and reduce the stress peak in the stress concentration area. Compared with the traditional technical solution, the annular first reinforcement part in this solution can reduce the possibility of stress concentration at the first penetration hole, and the second reinforcement part made of manganese steel material makes the stress distribution on the pressure block body more uniform, reduces the possibility of cracks in the pressure block body, and improves the fatigue life of the fixed pressure block. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the structure of a fixed pressing block provided in an embodiment of the utility model is shown;

[0020] Figure 2 A cross-sectional view of a fixed pressing block provided in an embodiment of the utility model is shown;

[0021] Figure 3 A top view of a fixed pressing block provided in an embodiment of the utility model is shown;

[0022] Figure 4 A bottom view of a fixed pressing block provided in an embodiment of the utility model is shown;

[0023] Figure 5 A schematic diagram of the structure of the second reinforcement part provided by an embodiment of the utility model is shown;

[0024] Figure 6 A side view of a second reinforcement portion provided by an embodiment of the utility model is shown;

[0025] Figure 7 A top view of a second reinforcement portion provided by an embodiment of the utility model is shown;

[0026] Figure 8 A partial structural cross-sectional view of a power device assembly provided by an embodiment of the utility model is shown.

[0027] The above drawings include the following reference numerals:

[0028] 10. Press block body; 101. First penetration hole;

[0029] 11. Positioning portion; 111. Guide slope;

[0030] 20. The first reinforcement part;

[0031] 21. The first reinforcement rib;

[0032] 22. Second reinforcement rib;

[0033] 30, second reinforcement portion; 301, second penetration hole; 302, long groove; 303, positioning hole;

[0034] 40. abutting protrusion;

[0035] 50. Annular protrusion;

[0036] 01. Radiator; 011. Heat dissipation substrate; 02. Power device body; 03. PCB board; 04. Fasteners. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] like Figures 1 to 4 As shown, the embodiment of the utility model provides a fixed pressure block, which includes a pressure block body 10, a first reinforcement part 20 and a second reinforcement part 30. The pressure block body 10 is provided with a first through hole 101, the pressure block body 10 has a first surface and a second surface arranged oppositely, and the first through hole 101 penetrates the pressure block body 10 from the first surface to the second surface. The first reinforcement part 20 is arranged on the first surface and is annularly arranged on the outer periphery of the first through hole 101. The second reinforcement part 30 is located in the pressure block body 10, wherein the second reinforcement part 30 is made of manganese steel material.

[0039] By applying the technical solution of the utility model, when fixing the power device, the power device is placed on the heat sink, and then the fixed pressing block is pressed on the power device, and the fastener 04 is passed through the first penetration hole 101 and connected to the heat sink 01 to achieve the fixation of the fixed pressing block and the power device. The force of the fastener 04 is applied to the pressing block body 10, and the setting of the first reinforcement part 20 and the second reinforcement part 30 can reduce the stress concentration on the pressing block body 10. Specifically, the annular first reinforcement part 20 can reduce the stress directly acting on the edge of the hole. In addition, the high strength and toughness of manganese steel enable the second reinforcement part 30 to effectively absorb and disperse stress and reduce the stress peak in the stress concentration area. Compared with the traditional technical solution, the setting of the annular first reinforcement part 20 in this solution can reduce the possibility of stress concentration at the first penetration hole 101, and the second reinforcement part 30 made of manganese steel material makes the stress distribution on the pressing block body 10 more uniform, reduces the possibility of cracks in the pressing block body 10, and improves the fatigue life of the fixed pressing block.

[0040] In the embodiment of the present solution, the first reinforcement portion 20 includes a plurality of reinforcement ribs, and the plurality of reinforcement ribs are distributed in a circular shape along the circumference of the first penetration hole 101 , and an angle is formed between two adjacent reinforcement ribs.

[0041] It is understandable that the multiple reinforcing ribs are distributed along the circumference of the first penetration hole 101, allowing the stress to be dispersed in multiple directions instead of being concentrated in a single direction, thereby reducing the peak value of local stress. In addition, there is an angle between two adjacent reinforcing ribs, which can provide uniform force in multiple directions, realize the redistribution of local stress on the reinforcing ribs, and further reduce the stress burden at the first penetration hole 101.

[0042] This solution does not limit the number of reinforcing ribs, as long as the first penetration hole 101 is located within the space formed by the plurality of reinforcing ribs.

[0043] like Figure 1 and Figure 4 As shown, in the embodiment of this solution, the first reinforcing portion 20 includes two first reinforcing ribs 21 and two second reinforcing ribs 22, and the first reinforcing ribs 21 and the second reinforcing ribs 22 are alternately distributed along the circumference of the first penetration hole 101, and the first penetration hole 101 is arranged in a rectangular space surrounded by the first reinforcing ribs 21 and the second reinforcing ribs 22. Such an arrangement allows the stress to be dispersed with as few reinforcing ribs as possible, and the structure is simple and easy to process.

[0044] Furthermore, the first reinforcing rib 21 extends along the width direction of the block body 10, and the two ends of the first reinforcing rib 21 extend to the two sides of the block body 10 respectively, and the second reinforcing rib 22 is located between the two first reinforcing ribs 21. The two ends of the first reinforcing rib 21 extend to the two sides of the fixed block respectively, and such a configuration can help to expand the local stress to a wider area, so that the stress is released along the extension direction of the first reinforcing rib 21, further reducing the problem of local stress concentration, and further reducing the possibility of cracks at the first penetration hole 101.

[0045] like Figure 1 As shown, the X direction is the length direction of the pressing block body 10 , the Z direction is the width direction of the pressing block body 10 , and the Y direction is the thickness direction of the pressing block body 10 .

[0046] In the embodiment of this solution, the two second reinforcing ribs 22 are parallel to each other, and the second reinforcing ribs 22 extend along the length direction of the fixed pressing block. This arrangement enables the first reinforcing portion 20 to form a symmetrical structure, which can help achieve uniform distribution of stress and reduce local stress concentration caused by asymmetry.

[0047] like Figure 1 and Figure 2As shown, further, the fixed pressing block also includes a positioning portion 11, which is arranged on the first surface, and the positioning portion 11 extends along the width direction of the pressing block body 10, and a limiting space is formed between the positioning portion 11 and the first reinforcing portion 20 to limit the power device. In the embodiment of this solution, the positioning portion 11 includes a positioning rib. Such a setting can realize the positioning of the power device, and can further improve the stability of fixing the power device.

[0048] In the embodiment of the present solution, two positioning parts 11 are provided, and the two positioning parts 11 are respectively provided at two ends in the length direction of the pressing block body 10. That is, the two positioning parts 11 are respectively provided at two edges in the length direction of the pressing block body 10. In this way, the structural layout is reasonable, so that the same fixed pressing block can realize the positioning of two power devices.

[0049] Specifically, the positioning portion 11 includes a positioning bar, and the positioning bar is parallel to the first reinforcing rib 21, that is, the positioning bar extends along the width direction of the pressing block body 10. Such a configuration has a simple structure and is easy to process.

[0050] Furthermore, the positioning portion 11 includes a guiding bevel 111, and the distance between the guiding bevel 111 and the first reinforcing portion 20 gradually increases along the direction from the second surface to the first surface. Generally, when fixing a power device, the power device needs to be placed on a heat sink, and then the fixed pressing block is placed on the power device along the direction from the power device to the heat sink, so that the power device is located in the limited space. The setting of the guiding bevel 111 plays a guiding role in the placement process of the fixed pressing block, thereby improving the smoothness of the assembly process.

[0051] Furthermore, the sidewall width of the first reinforcing portion 20 is smaller than the minimum width of the positioning portion 11. Specifically, in this solution, the sidewall width of the first reinforcing rib 21 is the same as the sidewall width of the second reinforcing rib 22. It can be understood that the sidewall width of the first reinforcing rib 21 can be understood as Figure 1 The width in the X direction shown in the figure, the side wall width of the second reinforcing rib 22 can be understood as the width in the X direction. Figure 1 The width of the positioning portion 11 in the Z direction can be understood as the width of the positioning portion 11 in the Z direction. Figure 1 The width in the X direction is shown.

[0052] It is worth noting that Figure 2As shown, the side wall width of the first reinforcing rib 21 is along the distribution direction of the two first reinforcing ribs 21, and the width dimension of the first reinforcing rib 21 is d1; the side wall width of the second reinforcing rib 22 is along the distribution direction of the two second reinforcing ribs 22, and the width dimension of the second reinforcing rib 22 can also be d1. The width of the positioning portion 11 is along the length direction of the block body 10. Since one side wall of the positioning portion 11 can be set as an inclined surface, the width of the end of the positioning portion 11 close to the block body 10 is different from the width of the end of the positioning portion 11 away from the block body 10. Figure 2 As shown, the minimum width of the positioning portion 11 refers to the width dimension of the end of the positioning portion 11 away from the pressing block body 10, and the dimension is d2.

[0053] Further, the fixed pressure block further includes a contact protrusion 40, which is disposed on the first surface, and is located between the positioning portion 11 and the first reinforcing portion 20. The thickness of the contact protrusion 40 is respectively smaller than the thickness of the first reinforcing portion 20 and the thickness of the positioning portion 11, and the contact protrusion 40 is used to contact the power device. The thickness of the contact protrusion 40 is respectively smaller than the thickness of the first reinforcing portion 20 and the thickness of the positioning portion 11. It can be understood that the thickness of the contact protrusion 40 can be understood as follows: Figure 1 In the Y direction shown in FIG. 1 , the thickness of the first reinforcing portion 20 and the thickness of the positioning portion 11 can also be understood as Figure 1 Y direction shown.

[0054] With such a configuration, after the fixed pressing block fixes the power device, the abutting protrusion 40 contacts the power device, and the abutting protrusion 40 with a smaller thickness can act as a flexible area, which can absorb and reduce the stress transmitted to the fixed pressing block through local deformation, further reducing the possibility of stress concentration in the fixed pressing block. In addition, the abutting protrusion 40 with a smaller thickness can alleviate the vibration generated by the power device during operation and reduce the noise generated by the power device during operation.

[0055] It can be understood that the abutting protrusion 40 includes abutting ribs. The thickness of the abutting protrusion 40 refers to the thickness from the first surface to the second surface of the block body 10; the thickness of the first reinforcing portion 20 refers to the thickness from the first surface to the second surface of the block body 10; the thickness of the positioning portion 11 refers to the thickness from the first surface to the second surface of the block body 10.

[0056] In the embodiment of the present solution, the extension direction of the abutting protrusion 40 is the same as the width direction of the block body 10, and the two ends of the abutting protrusion 40 extend to the two sides of the block body 10 respectively. Such a configuration has a simple structure and helps to increase the structural strength of the fixed block as a whole. The two ends of the abutting protrusion 40 extend to the two side walls of the block body 10 respectively, and such a configuration can help to release stress and reduce the situation where stress is transmitted to the block body 10.

[0057] like Figure 1 and Figure 2 As shown, in the embodiment of the present solution, the fixed pressing block further comprises an annular protrusion 50, which is arranged on the second surface of the pressing block body 10 and the outer periphery of the first penetration hole 101. The annular protrusion 50 is arranged coaxially with the first penetration hole 101, and the inner diameter of the annular protrusion 50 is greater than the diameter of the first penetration hole 101. When assembling the power device assembly, the annular protrusion 50 is used for the fixing part of the power device assembly to pass through.

[0058] like Figure 2 , Figures 5 to 7 As shown, specifically, the second reinforcement part 30 includes a reinforcement sheet, on which a second through hole 301 is provided, and the second through hole 301 is coaxial with the first through hole 101. In the embodiment of this solution, the diameter of the second through hole 301 is greater than the diameter of the first through hole 101, and the reinforcement sheet is embedded in the pressing block body 10. Such a configuration helps to increase the ability of the fixed pressing block to withstand the maximum load, and helps to maintain the structural integrity of the second reinforcement part 30.

[0059] In the embodiment of the present solution, the reinforcing sheet is embedded in the pressing block body 10 by injection molding. Such an arrangement can improve the stability of the connection between the reinforcing sheet and the pressing block body 10.

[0060] Furthermore, the reinforcing sheet is also provided with a long groove 302, two of which are arranged at intervals along the length direction of the reinforcing sheet, and the two long grooves 302 are respectively located at both ends of the second penetration hole 301, and the extension direction of the long groove 302 is the same as the length direction of the reinforcing sheet, and the long groove 302 can be formed by a stamping process. The reinforcing sheet is also provided with a positioning hole 303, and a plurality of positioning holes 303 are arranged. The arrangement of the long groove 302 and the positioning hole 303 can play a role in positioning the reinforcing sheet during the injection molding process, and improve the setting accuracy of the relative position between the reinforcing sheet and the pressing block body 10.

[0061] like Figures 1 to 8As shown, the embodiment of the utility model also provides a power device assembly, which includes a heat sink 01, a power device body 02, a PCB board 03, a fastener 04 and the above-mentioned fixed pressing block. Among them, the heat sink 01 includes a heat dissipation substrate 011, and the power device body 02 is placed on the heat dissipation substrate 011 of the heat sink 01. The first surface of the fixed pressing block faces the power device body 02, and the fixed pressing block abuts against the power device body 02. In this embodiment, each fixed pressing block can fix two power device bodies 02, and the two power device bodies 02 are respectively located in the two limiting spaces of the corresponding fixed pressing block. The PCB board 03 is arranged on the second surface of the fixed pressing block, and the pins of the power device body 02 are fixed on the PCB board 03. Specifically, a third through hole is provided on the PCB board 03, and the third through hole is sleeved on the outer periphery of the annular protrusion 50. The fastener 04 is connected to the heat sink 01 after passing through the first through hole 101 of the fixed pressing block, and the fastener 04 and the fixed pressing block cooperate to fix the power device body 02 on the heat sink 01. The fastener 04 comprises a fastening screw, a nut of which is located in the annular protrusion 50 .

[0062] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0063] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being only exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0064] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0066] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0067] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A fixed pressing block, characterized in that: The fixed pressing block comprises: The pressing block body is provided with a first through hole, the pressing block body has a first surface and a second surface arranged opposite to each other, and the first through hole penetrates the pressing block body along a direction from the first surface to the second surface; A first reinforcement portion is disposed on the first surface and is annularly disposed at the outer periphery of the first penetration hole; The second reinforcement part is located in the pressing block body, wherein the second reinforcement part is made of manganese steel material.

2. The fixed pressure block according to claim 1, characterized in that: The first reinforcement portion includes a plurality of reinforcement ribs, and the plurality of reinforcement ribs are distributed in an annular manner along the circumference of the first penetration hole, and an angle is formed between two adjacent reinforcement ribs.

3. The fixed pressure block according to claim 2, characterized in that: The first reinforcement portion includes two first reinforcement ribs and two second reinforcement ribs, and the first penetration hole is located in a space surrounded by the two first reinforcement ribs and the two second reinforcement ribs.

4. The fixed pressure block according to claim 3, characterized in that: The first reinforcing rib extends along the width direction of the pressing block body, and two ends of the first reinforcing rib extend to two sides of the pressing block body respectively, and the second reinforcing rib is located between the two first reinforcing ribs.

5. The fixed pressure block according to any one of claims 1 to 4, characterized in that: The fixed pressing block also includes: A positioning portion is arranged on the first surface, the positioning portion extends along the width direction of the pressing block body, and a limiting space is formed between the positioning portion and the first reinforcing portion to limit the power device.

6. The fixed pressure block according to claim 5, characterized in that: The positioning portion includes a guiding slope, and a distance between the guiding slope and the first reinforcing portion gradually increases along a direction from the second surface to the first surface.

7. The fixed pressure block according to claim 5, characterized in that: The side wall width of the first reinforcing portion is smaller than the minimum width of the positioning portion.

8. The fixed pressure block according to claim 5, characterized in that: The fixed pressing block also includes: An abutment protrusion is arranged on the first surface, the abutment protrusion is located between the positioning portion and the first reinforcement portion, the thickness of the abutment protrusion is respectively smaller than the thickness of the first reinforcement portion and the thickness of the positioning portion, and the abutment protrusion is used to abut against the power device.

9. The fixed pressure block according to claim 1, characterized in that: The second reinforcement portion includes a reinforcement sheet, the reinforcement sheet is provided with a second penetration hole, and the second penetration hole is coaxial with the first penetration hole.

10. A power device assembly, characterized in that: include: heat sink; A power device body is placed on the heat sink; The fixed pressure block according to any one of claims 1 to 9, wherein the first surface of the fixed pressure block faces the power device body, and the fixed pressure block abuts against the power device body; A PCB board, arranged on the second surface of the fixed pressing block, and the pins of the power device body are fixed on the PCB board; A fastener is connected to the heat sink after passing through the first through-holes of the PCB board and the fixed pressing block in sequence. The fastener cooperates with the fixed pressing block to fix the power device body on the heat sink.

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