Clamping elastic sheet and compact power module

Abstract

The utility model discloses a clamping elastic sheet and a compact power module. An arc-shaped bent wall enables a first wall and a second wall to always maintain a trend of outward expansion in opposite directions; the branch wall of the first wall sequentially comprises a first inclined wall, a bent wall and a second inclined wall from top to bottom; the bent wall and the second inclined wall are in arc transition to form a convex top contact part; the vertical acting wall of the second wall abuts against the first mounting wall of the heat dissipation bottom, the abutting part of the first wall abuts against the matching surface of the power device, and the two abutting construction points of the lever balance principle are opposite in position and closer in height position, so that the length of the overall structure can be smaller, the overall occupied space is smaller, and the structure is more compact. The upward displacement is limited by the matching of the positioning part and the positioning recess, so that stable connection can be realized only through two confronting abutting structures.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic device assembly, in particular to a clamping spring sheet and a compact power module. Background Art

[0002] Electronic devices usually include power devices such as MOSFET and IGBT. These power devices can usually withstand large currents and high voltages, but at the same time they are prone to accumulate heat energy due to poor heat dissipation performance, affecting the stability of the device.

[0003] Therefore, power devices are usually mounted on a heat sink, with one side of the package closely attached to the heat dissipation surface of the heat sink. For the assembly of power devices, a quick disassembly and assembly method has emerged, which includes the application of clamping springs.

[0004] Patent document 1: The invention patent with authorization announcement number CN114867280 B discloses an elastic pressing piece and a power module, wherein the elastic pressing piece includes a vertical wall, a transition wall, a first inclined wall and a second inclined wall connected in sequence; the vertical wall is used to be clamped by a tooling to assemble the elastic pressing piece from top to bottom; the transition wall and the first inclined wall form a first bent portion, and the first bent portion is used to abut against the mating surface of the power device to squeeze the power device onto the attachment surface; the first inclined wall and the second inclined wall form a second bent portion opposite to the first bent portion; the second bent portion is used to abut against the second abutting surface, and the second inclined wall is used to abut against the first abutting surface.

[0005] Patent document 2: The invention patent application with application publication number CN116613119A discloses an elastic pressing piece and a power module, wherein the heat dissipation base comprises a bottom wall, a first side wall and a second side wall; the first side wall and the second side wall are vertically arranged on both sides of the bottom wall opposite to each other; a protruding seat is provided on the upper surface of the bottom wall, and a fixing groove is formed between the protruding seat and the first side wall; the elastic pressing piece comprises a supporting bottom and a clamping side connected to the supporting bottom; the supporting bottom is stuck in the fixing groove; the clamping side is used to support the power device to fix the power device on the second side wall of the heat dissipation base.

[0006] As for Patent Document 1, since the force counteracting structure for the power device and the heat sink is arranged up and down along the length of the elastic pressing piece, the overall design of the elastic pressing piece is relatively long, and the assembly wall of the heat sink is relatively high, which is not conducive to the development needs of device miniaturization and compactness. In addition, based on the consideration of compactness, the groove structure for installing the elastic pressing piece is narrow, and it is difficult to process the groove and the slope surface on the wall of such a deep and narrow groove structure, with poor precision and relatively complicated process.

[0007] For Patent Document 2, the clamping force mainly relies on the fixed groove formed between the protruding seat and the first side wall, that is, the counteracting force is mainly located in the lower section of the elastic pressing plate. The clamping force is limited and the force is uneven. Under conditions of vibration, the elastic pressing plate is prone to detach from the fixed groove, resulting in unstable assembly. Utility Model Content

[0008] The utility model provides a clamping spring piece and a compact power module. The clamping spring piece is used to assemble a power device. The clamping spring piece occupies a small space, has a more compact structure, and has a more stable and reliable connection structure.

[0009] The technical solution adopted by the utility model to solve the above technical problems is: the clamping spring sheet comprises a first wall and a second wall opposite to each other formed by bending a plate-like member;

[0010] The arc-shaped curved wall enables the first wall and the second wall to always maintain a tendency to expand outward in opposite directions;

[0011] The first wall is composed of a plurality of partition walls spaced laterally from each other, and there are spacer grooves between adjacent partition walls;

[0012] The dividing wall includes, from top to bottom, a first inclined wall, a bent wall, and a second inclined wall;

[0013] The lower end of the first inclined wall is located on a side of the bent wall close to the second wall; the upper end of the first inclined wall is separated from the upper end of the second wall;

[0014] The first inclined wall and the second inclined wall are inclined in the same direction; the extension axes of the first inclined wall and the second inclined wall are both at an acute angle to the extension axis of the second wall;

[0015] The bent wall and the second inclined wall have an arc transition, the bent wall and the second inclined wall form an outwardly convex top contact portion, and the top contact portion has an arc-shaped outer surface;

[0016] The second wall comprises a vertical action wall opposite to the second inclined wall, the second inclined wall extends downward and is connected to the lower end of the vertical action wall via an arc-shaped curved wall;

[0017] The outer surface of the vertical action wall is provided with a positioning portion protruding in a direction away from the top contact portion.

[0018] The preferred technical solution adopted by the utility model to solve the above technical problems is: the second wall is horizontally continuous and includes a vertical clamping wall, a horizontal transition wall and a vertical action wall from top to bottom.

[0019] The second wall is in a bent shape, the vertical action wall is shorter than the second inclined wall, and after the second inclined wall approaches the vertical action wall, the bent wall is located above the transverse transition wall.

[0020] The preferred technical solution adopted by the utility model to solve the above technical problem is: the positioning portion is composed of a plurality of positioning protrusions spaced apart from each other laterally, and the positioning protrusions are opposite to the second inclined walls of the partition wall one by one.

[0021] The preferred technical solution adopted by the utility model to solve the above technical problem is: the positioning portion is a transverse ridge on the outer surface of the second wall, and the transverse ridge is opposite to the second inclined wall of each partition wall.

[0022] The preferred technical solution adopted by the utility model to solve the above technical problems is: the second wall is horizontally continuous and includes a vertical clamping wall and a vertical action wall from top to bottom, and the vertical clamping wall and the vertical action wall are located on the same plane.

[0023] The preferred technical solution adopted by the utility model to solve the above technical problem is: the lower sections of the second inclined walls are connected to form a transverse continuous wall, and the transverse continuous wall connects the lower ends of the partition walls to each other.

[0024] The preferred technical solution adopted by the utility model to solve the above technical problem is: a plurality of longitudinal ridges are provided on the outer surface of the second wall, and the longitudinal ridges extend downward from the upper end of the second wall over the transverse ridges.

[0025] The technical solution adopted by the utility model to solve the above technical problems is: a compact power module, including a power device, a heat dissipation base and a clamping spring for fixing the power device;

[0026] The heat dissipation base comprises a first mounting wall and a second mounting wall, wherein the first mounting wall is a vertical wall;

[0027] The first mounting wall and the second mounting wall are far away from each other and form a mounting groove;

[0028] The clamping spring comprises a first wall and a second wall connected by an arc-shaped curved wall;

[0029] The first wall is composed of a plurality of partition walls spaced laterally from each other, and there are spacer grooves between adjacent partition walls;

[0030] The dividing wall includes, from top to bottom, a first inclined wall, a bent wall, and a second inclined wall;

[0031] The first inclined wall and the second inclined wall are inclined in the same direction; the extension axes of the first inclined wall and the second inclined wall are both at an acute angle to the extension axis of the second wall;

[0032] The upper ends of the first inclined wall and the second wall are separated, and the lower ends of the second inclined wall and the second wall are connected;

[0033] The curved wall and the second inclined wall transition into an arc to form a convex top contact portion;

[0034] The outer surface of the second wall is provided with a positioning portion protruding in a direction away from the top contact portion;

[0035] The first mounting wall of the heat dissipation base is provided with a positioning recess matching the positioning portion;

[0036] The power device is located between the first mounting wall and the second mounting wall and is close to the first vertical surface of the second mounting wall;

[0037] The clamping spring is inserted between the power device and the first mounting wall, the top contact portion is tightly against the power device, the vertical action wall of the lower section of the second wall is in contact with the first mounting wall, and the positioning portion is embedded in the positioning recess.

[0038] The preferred technical solution adopted by the utility model to solve the above technical problems is: the second wall is horizontally continuous and includes a vertical clamping wall, a horizontal transition wall and a vertical action wall from top to bottom;

[0039] The lower end of the vertical action wall is connected to the second inclined wall, and the outer surface of the vertical action wall is provided with the positioning portion;

[0040] The vertical clamping wall is located on the upper side of the heat dissipation base, the transverse transition wall is placed on the upper end surface of the first installation wall, and the vertical action wall is inserted into the assembly groove and is tightly attached to the first installation wall.

[0041] The preferred technical solution adopted by the utility model to solve the above technical problems is: the positioning portion is a plurality of positioning protrusions spaced apart from each other laterally, the positioning protrusions are opposite to the second inclined wall of the partition wall one by one, the positioning recess is a plurality of positioning grooves spaced apart from each other laterally corresponding to the positioning protrusions, the outer surface of the positioning protrusion is an outer convex spherical crown surface, and the bottom surface of the positioning groove is an inner concave spherical crown surface;

[0042] Or the positioning portion is a plurality of positioning protrusions spaced apart from each other laterally, the positioning protrusions are opposite to the second inclined walls of the partition wall one by one, the positioning recess is a transverse groove, and all the positioning protrusions of the positioning portion can fall into the transverse groove;

[0043] Or the positioning portion is a transverse ridge on the outer surface of the second wall, the transverse ridge is opposite to the second inclined wall of each partition wall, the positioning recess is a transverse groove matching the transverse ridge, the outer surface of the transverse ridge is an outer convex arc surface, and the bottom surface of the transverse groove is an inner concave arc surface.

[0044] The preferred technical solution adopted by the utility model to solve the above technical problems is: a plurality of longitudinal ridges are provided on the outer surface of the second wall, and the longitudinal ridges extend upward from the lower side of the positioning portion to the upper side of the positioning portion;

[0045] The inner surface of the vertical wall is provided with a plurality of longitudinal grooves spaced apart from each other, and the longitudinal grooves extend to the upper end surface of the vertical wall to form guide notches; the longitudinal ridges are inserted into the longitudinal grooves from the guide notches;

[0046] The cooperation between the longitudinal ridge and the longitudinal groove plays a positioning and guiding role in the insertion of the clamping spring.

[0047] Compared with the prior art, the advantages of the above technical solution adopted by the utility model are as follows: the vertical action wall of the second wall abuts against the first installation wall of the heat dissipation bottom, the top contact portion of the first wall abuts against the mating surface of the power device, and the two abutting structural points of the lever balance principle are relative and closer in height, so the length of the overall structure can be smaller, the overall occupied space is smaller, and the structure is more compact. The upward displacement is limited by the cooperation of the positioning portion and the positioning recess, so that a stable connection can be achieved only by two opposing abutting structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described object and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0049] Figure 1 Schematic diagram of the power module in the first embodiment of the present utility model Figure 1 ;

[0050] Figure 2 Schematic diagram of the power module in the first embodiment of the present utility model Figure 2 ;

[0051] Figure 3 Schematic diagram of the power module in the first embodiment of the present utility model Figure 3 ;

[0052] Figure 4 This is a schematic diagram of the middle of the assembly process of the power module in the first embodiment of the utility model;

[0053] Figure 5 Schematic diagram of the clamping spring in the first embodiment of the utility model Figure 1 ;

[0054] Figure 6 Schematic diagram of the clamping spring in the first embodiment of the utility model Figure 2 ;

[0055] Figure 7 Schematic diagram of the clamping spring in the first embodiment of the utility model Figure 3 ;

[0056] Figure 8 This is a schematic diagram of the heat dissipation base in the first embodiment of the present utility model;

[0057] Fig. 9 It is a schematic diagram of a power module in the second embodiment of the present utility model;

[0058] Fig.10 Schematic diagram of the clamping spring in the second embodiment of the present utility model Figure 1 ;

[0059] Fig.11 Schematic diagram of the clamping spring in the second embodiment of the present utility model Figure 2 ;

[0060] Fig.12 This is a schematic diagram of the heat dissipation base in the second embodiment of the present utility model;

[0061] Fig.13 This is a schematic diagram of a power module in Embodiment 3 of the present utility model;

[0062] Fig.14 It is a schematic diagram of the clamping spring in the third embodiment of the utility model;

[0063] Fig.15 This is a schematic diagram of the heat dissipation base in the third embodiment of the present utility model. DETAILED DESCRIPTION

[0064] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. Those skilled in the art will appreciate that these descriptions are only descriptive and exemplary and should not be interpreted as limiting the scope of protection of the utility model. That is, the preferred embodiments described below are only used as examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0065] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "vertical", "lateral", "up", "down", "front", "back", "left", "right", "longitudinal", "horizontal", "bottom", "inside" and "outside" etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0066] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0067] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0068] As shown in the figure, the utility model provides a power module, including a power device 2, a heat dissipation base 1 and a clamping spring 3 for fixing the power device 2.

[0069] As shown in the figure, the assembly area of ​​the heat dissipation base 1 for assembling the power module is a slot structure, that is, an assembly slot S, and the two opposite sides of the assembly slot S are a first installation wall 11 and a second installation wall 12 .

[0070] The power device 2 includes a packaging part, which has two pairs of two surfaces - a heat dissipation surface and a mating surface. The power device 2 is arranged on a side close to the second mounting wall 12, and the heat dissipation surface faces the second mounting wall 12, and the mating surface faces the first mounting wall across the gap. The clamping spring 3 is inserted between the mating surface of the power device 2 and the first mounting wall 11, which forms a reverse force on the power device 2 and the first mounting wall 11, thereby pressing the power device 2 against the second mounting wall 12. The second mounting wall 12 cooperates with the power device 2 through surface contact to achieve heat dissipation, thereby transferring the heat of the power device 2 to the heat dissipation base 1 through heat conduction to further achieve outward heat dissipation.

[0071] The following embodiments respectively provide a clamping spring 3 for mounting a power device 2, and a heat sink 1 adapted thereto. It should be noted that in each embodiment, the clamping spring 3 and the heat sink 1 do not necessarily need to be matched at the same time, and some technical features of the heat sink 1 cannot limit the structure of the clamping spring 3 itself.

[0072] Embodiment 1:

[0073] Referring to the accompanying drawings of the present invention Figures 1 to 8 This embodiment provides a compact power module, a clamping spring 3 and a heat dissipation base 1.

[0074] like Figure 1 As shown, this embodiment provides a compact power module, which achieves the purpose of compactness by occupying less space volume of the heat dissipation base 1. The heat dissipation base 1 has a first mounting wall 11 and a second mounting wall 12 that are far away from each other, and the first mounting wall 11 and the second mounting wall 12 are opposite to each other so that an assembly groove S with an open upper side is formed therebetween. The power device 2 includes a packaging portion, and the packaging portion has two pairs of two surfaces - a heat dissipation surface and a mating surface. The heat dissipation surface of the power device 2 is against the first vertical surface 121. The clamping spring 3 is inserted between the mating surface of the power device 2 and the first mounting wall 11, which forms a reverse force on the power device 2 and the first mounting wall 11, thereby pressing the power device 2 against the first vertical surface 121 of the second mounting wall 12.

[0075] like Figure 1 , 5 As shown, the clamping spring 3 provided in this embodiment includes a first wall 31 and a second wall 32 formed by bending a plate-like member. The upper ends of the first wall 31 and the second wall 32 are separated.

[0076] like Figure 5 , 6 As shown, the first wall 31 is composed of a plurality of partition walls 310 that are laterally spaced from each other, and there are spacer grooves E between adjacent partition walls 310 .

[0077] like Figure 2-5 As shown, each partition wall 310 includes a first inclined wall 311, a bent wall 312, and a second inclined wall 313 from top to bottom. The first inclined wall 311 and the second inclined wall 313 are inclined in the same direction; the extension axes of the first inclined wall 311 and the second inclined wall 313 are both at an acute angle to the extension axis of the second wall 32. The lower end of the first inclined wall 311 is located on the side of the bent wall 312 close to the second wall 32. That is, the bent wall 312 and the second inclined wall 313 form a convex top contact portion F. The bent wall 312 and the second inclined wall 313 are in arc transition, so that the top contact portion F has an arc-shaped outer surface.

[0078] like Figure 2-5 As shown, the second wall 32 is continuous in the transverse direction and includes, from top to bottom, a vertical clamping wall 321, a transverse transition wall 322 and a vertical action wall 323. The lower end of the vertical clamping wall 321 is located on the side of the transverse transition wall 322 away from the first wall 31. The vertical clamping wall 321 is opposite to the first inclined wall 311, and the vertical action wall 323 is opposite to the second inclined wall 313, and the second wall 32 is in a bent shape.

[0079] like Figure 2-5As shown, the second inclined wall 313 of the first wall 31 extends downward and is connected to the lower end of the vertical action wall 323 through the arc-shaped curved wall 33, so that the lower end of the clamping spring 3 presents a V-shaped structure. The gap and angle between the first wall 31 and the second wall 32 of the clamping spring 3 are adjusted by the elastic potential energy of the arc-shaped curved wall 33 under the external force on the first wall 31 and the second wall 32, so that there is a variable spacing distance between the first wall 31 and the second wall 32. The elasticity of the arc-shaped curved wall 33 makes the first wall 31 and the second wall 32 always maintain a trend of expanding outward in opposite directions.

[0080] like Figure 3 , 5 As shown in FIGS. 7 and 8 , the outer surface of the vertical action wall 323 away from the first wall 31 is provided with a positioning portion Y protruding in a direction away from the top contact portion F, and the first mounting wall 11 of the heat dissipation base 1 is provided with a positioning recess W matching the positioning portion Y on the inner wall facing the assembly groove S.

[0081] Such a clamping spring 3 and heat dissipation base 1 are applied in a power module to form a compact power module.

[0082] like Figure 4 As shown, during assembly, the first wall 31 and the second wall 32 are closed, the spacing and angle between the vertical action wall 323 and the second inclined wall 313 become smaller, and the arc-shaped curved wall 33 is compressed. The clamping spring 3 is inserted between the mating surface of the power device 2 and the first mounting wall 11 with the arc-shaped curved wall 33 facing downward.

[0083] like Figure 2 , 3 As shown, after release, the vertical action wall 323 of the second wall 32 abuts against the first installation wall 11 of the heat dissipation base 1, the top contact portion F of the first wall 31 abuts against the matching surface of the power device 2, and the positioning portion Y is embedded in the positioning recess W to achieve limiting.

[0084] At this point, a tight contact structure based on the lever balance principle is formed between the clamping spring piece 3 , the power device 2 , and the heat sink 1 , so that a stable output pressing force is provided by utilizing the elastic deformation of the clamping spring piece 3 .

[0085] Compared with the patent of CN114867280 B, in this embodiment, the height positions of the two abutting construction points of the lever balancing principle are closer, so the length of the overall structure is smaller, the overall occupied space is smaller, and the structure is more compact.

[0086] Compared with the patent of CN116613119A, in this embodiment, the upward displacement is limited by the cooperation of the positioning portion Y and the positioning recess W, so that a stable connection can be achieved only by two opposing tight-abutting structures. No raised seat is required in the assembly groove S, the structure of the heat dissipation base 1 is simpler, and the utilization rate of the assembly groove S is higher.

[0087] The maximum static friction force of the clamping spring 3, i.e., the force after the clamping spring 3 is compressed multiplied by the friction coefficient of the contact surface between the clamping spring 3 and the shell, can always keep the force system balanced with the deadweight of the clamping spring 3 under static working conditions. Under dynamic working conditions, even if it is impacted by accelerations of 1-50g in different directions, it is still much smaller than the maximum static friction force of the clamping spring 3. However, considering the impact response of different frequencies, the heat dissipation base 1 and the clamping spring 3 may be out of contact in a very short time in certain modes, causing a slight slip and continuing to cause a tendency to move in a certain direction, so the constraint is strengthened by the cooperation of the positioning portion Y and the positioning recess W.

[0088] When assembling the power device 2, each partition wall 310 corresponds to a certain number of partial power devices 2, so that the force on the power device 2 can be more uniform. In addition, the spacer grooves E between the partition walls 310 also provide assembly and movement space for the positioning tooling used to assemble the power device 2.

[0089] It should be understood that one partition wall 310 corresponds to one power device 2, or one partition wall 310 corresponds to several power devices 2, or even several partition walls 310 correspond to one power device 2. For example, when two partition walls 310 correspond to one power device 2, the partition walls 310 respectively press the two sides of the power device 2, so that the clamping effect on the power device 2 can be strengthened.

[0090] like Figure 2-7 As shown, in this embodiment, the bending structure of the first wall 31 not only forms a top contact portion F in the middle, but also enhances the strength of the partition wall 310 itself, making the supporting capacity stronger, thereby making the force between the partition wall 310 and the power device 2 more stable.

[0091] The top contact portion F is used to press the assembly surface of the power device 2. Compared with the sharp corners, the arc-shaped outer surface can avoid scratching the power device 2. More importantly, the top contact portion F with the arc-shaped outer surface can adaptively form a center top contact even when the assembly surface is uneven, thereby forming a stable connection structure.

[0092] like Figure 3 , 4 As shown, in this embodiment, the length of the vertical action wall 323 is smaller than the second inclined wall 313, and after the second inclined wall 313 approaches the vertical action wall 323, the bending wall 312 is located above the transverse transition wall 322. The vertical action wall 323 is merged with the second inclined wall 313, and the gap between the two is extremely small. The lower section of the clamping spring 3 is in an I shape and can enter the relatively narrow assembly slot S, thereby reducing the space occupied by the clamping spring 3.

[0093] like Figure 2-5As shown, the second wall 32 is set to a bending structure. When the clamping spring 3 under the transverse transition wall 322 is inserted into the assembly groove S, it will contact the upper end surface of the first mounting wall 11 of the heat dissipation base 1, which serves as a downward travel limit during installation, further ensuring the precise fit of the positioning portion Y and the positioning recess W in position.

[0094] Further preferably, after assembly, the arc-shaped curved wall 33 of the clamping spring 3 is tightly against the bottom of the assembly slot S, and the transverse transition wall 322 is tightly against the upper end surface of the first installation wall 11 of the heat dissipation base 1 .

[0095] When the clamping spring piece 3 is compressed, it may be slightly deformed, so that the clamping spring piece 3 is twisted. Figure 2 The fulcrum u has room for slight rotation. The lateral transition wall 322 is fully constrained by the upper end surface of the first mounting wall 11 to prevent the clamping spring 3 from rotating, thereby further ensuring the stability of the structure.

[0096] like Figure 3 , 5 As shown in FIG. 7 , preferably, the positioning portion Y is a plurality of positioning protrusions Y1 spaced apart from each other laterally, and the positioning protrusions Y1 are opposite to the second inclined walls 313 of the partition wall 310 one by one, and the stability is further improved through the one-to-one correspondence.

[0097] Furthermore, if Figure 8 As shown, the positioning recess W is a transverse groove W1. All positioning protrusions Y1 of the positioning portion Y can fall into the transverse groove W1. The cooperation between the positioning protrusion Y1 and the transverse groove W1 plays a role in preventing the upper and lower parts from falling off, further limiting the position of the clamping spring 3.

[0098] The cooperation between the strip-shaped transverse groove W1 and the dot-shaped positioning protrusion Y1 reduces the position accuracy requirement for the clamping spring piece 3 along the extension direction of the assembly groove S, so that the clamping spring piece 3 can be micro-adjusted adaptively according to the working conditions during and after the insertion process.

[0099] Preferably, the outer surface of the positioning protrusion Y1 is an outer convex spherical crown surface, and the bottom surface of the transverse groove W1 is an inner concave arc surface. The outer convex spherical crown surface of the positioning protrusion Y1 is arranged when the clamping spring 3 is inserted into the assembly groove S, which can prevent the positioning part Y from scratching the heat sink 1, prevent the generation of aluminum chips, and ensure the electrical performance of the power module.

[0100] The cooperation between the outer convex spherical crown surface and the inner concave arc surface can also make it easier for the positioning protrusion Y1 to enter the transverse groove W1 and the assembly gap between the two is smaller after assembly, further improving the limiting effect.

[0101] like Figure 5As shown, preferably, the partition groove E between the dividing walls 310 penetrates the arc-shaped curved wall 33, and separates the arc-shaped curved walls 33 from each other to form a petal-shaped structure extending from the lower end of the vertical action wall 323, so that the arc-shaped curved wall 33 is more likely to undergo elastic deformation, making assembly more labor-saving and convenient.

[0102] like Figure 1 , 5 As shown in FIG. 8 , both sides of the vertical action wall 323 are provided with limiting convex ribs K, and the first mounting wall 11 of the heat dissipation base 1 is provided with limiting card slots G, which extend upward to the upper end surface of the first mounting wall 11 to form an insertion opening d. The cooperation between the limiting card slots G and the limiting convex ribs K facilitates visual positioning during automation, plays a role in guiding insertion, and plays a role in limiting the displacement of the clamping spring 3 along the extension direction of the assembly slot S after assembly.

[0103] Preferably, the positioning protrusion Y1 and the limiting rib K are located in the upper section of the vertical action wall 323, and the positioning groove and the limiting slot G are also correspondingly located at a position close to the upper end surface of the first mounting wall 11, further reducing the possible contact stroke between the positioning protrusion Y1 and the first mounting wall 11, and can also reduce the compression amount of the first wall 31 toward the second wall 32 during insertion, further making the assembly more labor-saving and further reducing the possibility of aluminum chips.

[0104] Embodiment 2:

[0105] Referring to the accompanying drawings of the present invention Figures 9 to 12 The second embodiment improves the partial structures of the heat dissipation base 1 and the clamping spring 3 on the basis of the first embodiment. However, the inventive concept is still consistent with the first embodiment. Based on this, the partial structures between the two embodiments can be combined with each other and are not limited by the embodiments.

[0106] The structure and corresponding installation method of the heat dissipation base 1 and the clamping spring 3 of the second embodiment are described below, and the parts that are the same as those in the first embodiment are not repeated. In particular, the functions of the replacement structures with the same structure or the same function as the embodiment are not expanded, and those skilled in the art should understand this embodiment based on the understanding of the overall solution.

[0107] like Fig. 9 , 12As shown, this embodiment provides a compact power module, which achieves the purpose of compactness by occupying less space volume of the heat dissipation base 1. The heat dissipation base 1 has a first mounting wall 11 and a second mounting wall 12 that are far away from each other, the first mounting wall 11 is a vertical wall, and the second mounting wall 12 is a step wall. The vertical wall and the step wall are opposite to each other so that an assembly groove S with an upper side open is formed between the two. The step wall includes a first vertical surface 121, a transverse support surface 122 and a second vertical surface 123. The power device 2 includes a packaging part, and the packaging part has two pairs of two surfaces-a heat dissipation surface and a mating surface. The power device 2 is placed on the transverse support surface 122 and the heat dissipation surface is against the first vertical surface 121. The clamping spring 3 is inserted between the mating surface and the vertical wall of the power device 2, which forms a reverse force on the power device 2 and the vertical wall, thereby pressing the power device 2 against the first vertical surface 121.

[0108] like Fig.10 , 11 As shown, the clamping spring 3 provided in this embodiment includes a first wall 31 and a second wall 32 formed by bending a plate-like member. The upper ends of the first wall 31 and the second wall 32 are separated. The first wall 31 is composed of a plurality of partition walls 310 spaced laterally from each other, and there are spacer grooves E between adjacent partition walls 310.

[0109] like Fig. 9 , 10 As shown, each partition wall 310 includes a first inclined wall 311, a bent wall 312, and a second inclined wall 313 from top to bottom. The first inclined wall 311 and the second inclined wall 313 are inclined in the same direction; the extension axes of the first inclined wall 311 and the second inclined wall 313 are both at an acute angle to the extension axis of the second wall 32. The lower end of the first inclined wall 311 is located on the side of the bent wall 312 close to the second wall 32. That is, the bent wall 312 and the second inclined wall 313 form a convex top contact portion F. The bent wall 312 and the second inclined wall 313 are in arc transition, so that the top contact portion F has an arc-shaped outer surface.

[0110] like Figure 9-11 As shown, the second wall 32 is horizontally continuous and is a flat plate. The upper portion of the second wall 32 is used to be clamped by the tooling during assembly, and is located on the upper side of the vertical wall after assembly, thereby forming a vertical clamping wall 321. The lower portion thereof enters the assembly groove S and is in abutment with the vertical wall, thereby forming a vertical action wall 323. The vertical clamping wall 321 and the vertical action wall 323 are located on the same plane.

[0111] As shown in the figure, the second inclined wall 313 of the first wall 31 extends downward and is connected to the lower end of the second wall 32 through the arc-shaped curved wall 33, so that the lower end of the clamping spring 3 presents a V-shaped structure.

[0112] The gap and angle between the first wall 31 and the second wall 32 of the clamping spring 3 are adjusted by the elastic potential energy of the arc-shaped curved wall 33 under the external force on the first wall 31 and the second wall 32, so that there is a variable spacing distance between the first wall 31 and the second wall 32. The elasticity of the arc-shaped curved wall 33 makes the first wall 31 and the second wall 32 always maintain a tendency to expand outward in opposite directions.

[0113] like Fig.10 As shown, preferably, the partition groove E between the dividing walls 310 penetrates the arc-shaped curved wall 33, and separates the arc-shaped curved walls 33 from each other to form a petal-shaped structure extending from the lower end of the vertical action wall 323, so that the arc-shaped curved wall 33 is more likely to undergo elastic deformation, making assembly more labor-saving and convenient.

[0114] like Fig. 9 As shown, the outer surface of the vertical action wall 323 away from the first wall 31 is provided with a positioning portion Y protruding in a direction away from the top contact portion F, and the inner wall of the vertical wall of the heat dissipation base 1 facing the assembly groove S is provided with a positioning recess W matching the positioning portion Y.

[0115] Such a clamping spring 3 and heat dissipation base 1 are applied in a power module to form a compact power module.

[0116] During assembly, the first wall 31 and the second wall 32 are closed, the spacing and angle between the vertical action wall 323 and the second inclined wall 313 become smaller, and the arcuate wall 33 is compressed. The clamping spring 3 is inserted between the mating surface of the power device 2 and the first mounting wall 11 with the arcuate wall 33 facing downward.

[0117] After release, the vertical action wall 323 of the second wall 32 abuts against the first installation wall 11 of the heat dissipation base 1, the top contact portion F of the first wall 31 abuts against the matching surface of the power device 2, and the positioning portion Y is embedded in the positioning recess W to achieve limiting.

[0118] At this point, a tight contact structure based on the lever balance principle is formed among the clamping spring piece 3 , the power device 2 and the heat sink 1 , so that a stable output pressing force is provided by utilizing the elastic deformation of the clamping spring piece 3 .

[0119] Compared with the patent of CN114867280 B, in this embodiment, the height positions of the two abutting construction points of the lever balancing principle are closer, so the length of the overall structure is smaller, making the structure more compact.

[0120] Compared with the patent of CN116613119A, in this embodiment, the upward displacement is limited by the cooperation of the positioning portion Y and the positioning recess W, so that a stable connection can be achieved only by two opposing tight-abutting structures. No raised seat is required in the assembly groove S, the structure of the heat dissipation base 1 is simpler, and the utilization rate of the assembly groove S is higher.

[0121] Preferably, if Fig.11 , 12 As shown, the positioning portion Y is a plurality of laterally spaced positioning protrusions Y1, the positioning protrusions Y1 are opposite to the second inclined walls 313 of the partition wall 310 one by one, the positioning recess W is a plurality of laterally spaced positioning grooves H corresponding to the positioning protrusions Y1, the outer surface of the positioning protrusions Y1 is an outer convex spherical crown surface, and the bottom surface of the positioning grooves H is an inner concave spherical crown surface.

[0122] Although the point-to-point positioning method has higher positioning requirements during assembly, it can limit the displacement of the clamping spring piece 3 along the extension direction of the assembly groove S while preventing it from falling off up and down after assembly, thereby further limiting the position of the clamping spring piece 3.

[0123] Embodiment three:

[0124] Referring to the accompanying drawings of the present invention Figures 13 to 15 The third embodiment improves the partial structures of the heat dissipation base 1 and the clamping spring 3 on the basis of the first and second embodiments. However, the inventive concept is still consistent with the first embodiment. Based on this, the partial structures between the two embodiments can be combined with each other and are not limited by the embodiments.

[0125] The following describes the structure and corresponding installation method of the heat dissipation base 1 and the clamping spring 3 of the third embodiment, wherein the parts that are the same as those in the first and second embodiments are not repeated. In particular, the functions of the replacement structures with the same structure or the same function as the embodiment are not expanded, and those skilled in the art should understand this embodiment based on the cognition of the overall solution.

[0126] like Fig.13 , 15 As shown, this embodiment provides a compact power module, which achieves the purpose of compactness by occupying less space volume of the heat dissipation base 1. The heat dissipation base 1 has vertical walls and step walls that are far away from each other, and the vertical walls and step walls are opposite to each other so that an assembly groove S with an open upper side is formed between the two. The step wall includes a first vertical surface 121, a transverse support surface 122 and a second vertical surface 123. The power device 2 includes a packaging part, and the packaging part has two pairs of two surfaces-a heat dissipation surface and a mating surface. The power device 2 is placed on the transverse support surface 122 and the heat dissipation surface is against the first vertical surface 121. The clamping spring 3 is inserted between the mating surface and the vertical wall of the power device 2, which forms a reverse force on the power device 2 and the vertical wall, thereby pressing the power device 2 tightly against the first vertical surface 121.

[0127] like Fig.14As shown, the clamping spring 3 provided in this embodiment includes a first wall 31 and a second wall 32 formed by bending a plate-like member. The upper ends of the first wall 31 and the second wall 32 are separated. The first wall 31 is composed of a plurality of partition walls 310 spaced laterally from each other, and there are spacer grooves E between adjacent partition walls 310.

[0128] like Fig.14 As shown, each partition wall 310 includes a first inclined wall 311, a bent wall 312, and a second inclined wall 313 from top to bottom. The first inclined wall 311 and the second inclined wall 313 are inclined in the same direction; the extension axes of the first inclined wall 311 and the second inclined wall 313 are both at an acute angle to the extension axis of the second wall 32. The lower end of the first inclined wall 311 is located on the side of the bent wall 312 close to the second wall 32. That is, the bent wall 312 and the second inclined wall 313 form a convex top contact portion F. The bent wall 312 and the second inclined wall 313 are in arc transition, so that the top contact portion F has an arc-shaped outer surface.

[0129] like Fig.13 , 14 As shown, the second wall 32 is horizontally continuous and is a flat plate. The upper portion of the second wall 32 is used to be clamped by the tooling during assembly, and is located on the upper side of the vertical wall after assembly, thereby forming a vertical clamping wall 321. The lower portion thereof enters the assembly groove S and is in abutment with the vertical wall, thereby forming a vertical action wall 323. The vertical clamping wall 321 and the vertical action wall 323 are located on the same plane.

[0130] like Fig.13 , 14 As shown, the second inclined wall 313 of the first wall 31 extends downward and is connected to the lower end of the second wall 32 via an arc-shaped curved wall 33 , so that the lower end of the clamping spring 3 presents a V-shaped structure.

[0131] The gap and angle between the first wall 31 and the second wall 32 of the clamping spring 3 are adjusted by the elastic potential energy of the arc-shaped curved wall 33 under the external force on the first wall 31 and the second wall 32, so that there is a variable spacing distance between the first wall 31 and the second wall 32. The elasticity of the arc-shaped curved wall 33 makes the first wall 31 and the second wall 32 always maintain a tendency to expand outward in opposite directions.

[0132] like Fig.13 , 14 As shown, preferably, a distance is left between the bottom of the partition groove E between the partition walls 310 and the arc-shaped curved wall 33, and the lower sections of the second inclined walls 313 are connected to form a transverse continuous wall, which connects the lower ends of the partition walls 310 to each other. The second inclined wall 313 including the transverse continuous wall is located on the same plane, and the transverse continuous wall and the second wall 32 are connected by the arc-shaped curved wall 33 located at the bottom.

[0133] like Figure 13-15 As shown, the outer surface of the vertical action wall 323 away from the first wall 31 is provided with a positioning portion Y protruding in a direction away from the top contact portion F, and the inner wall of the vertical wall of the heat dissipation base 1 facing the assembly groove S is provided with a positioning recess W matching the positioning portion Y.

[0134] Such a clamping spring 3 and heat dissipation base 1 are applied in a power module to form a compact power module.

[0135] During assembly, the first wall 31 and the second wall 32 are closed, the spacing and angle between the vertical action wall 323 and the second inclined wall 313 become smaller, and the arcuate wall 33 is compressed. The clamping spring 3 is inserted between the matching surface of the power device 2 and the vertical wall with the arcuate wall 33 facing downward.

[0136] After release, the vertical action wall 323 of the second wall 32 abuts against the vertical wall of the heat dissipation base 1 , the top contact portion F of the first wall 31 abuts against the matching surface of the power device 2 , and the positioning portion Y is embedded in the positioning recess W to achieve limiting.

[0137] At this point, a tight contact structure based on the lever balance principle is formed among the clamping spring piece 3 , the power device 2 and the heat sink 1 , so that a stable output pressing force is provided by utilizing the elastic deformation of the clamping spring piece 3 .

[0138] Compared with the patent of CN114867280 B, in this embodiment, the height positions of the two abutting construction points of the lever balancing principle are closer, so the length of the overall structure is smaller, making the structure more compact.

[0139] Compared with the patent of CN116613119A, in this embodiment, the upward displacement is limited by the cooperation of the positioning portion Y and the positioning recess W, so that a stable connection can be achieved only by two opposing tight-abutting structures. No raised seat is required in the assembly groove S, the structure of the heat dissipation base 1 is simpler, and the utilization rate of the assembly groove S is higher.

[0140] like Figure 13-15 As shown, preferably, the positioning portion Y is a transverse ridge Q on the outer surface of the second wall 32, the transverse ridge Q is opposite to the second inclined wall 313 of each partition wall 310, the positioning recess W is a transverse groove W1 matching the transverse ridge Q, the outer surface of the transverse ridge Q is an outer convex arc surface, and the bottom surface of the transverse groove W1 is an inner concave arc surface.

[0141] The convex arc surface of the transverse ridge Q is arranged to prevent the positioning part Y from scratching the heat sink 1 when the clamping spring 3 is inserted into the assembly groove S, thereby preventing the generation of aluminum chips and ensuring the electrical performance of the power module. The cooperation between the convex arc surface of the transverse ridge Q and the concave arc surface of the transverse groove W1 can also make it easier for the transverse ridge Q to enter the transverse groove W1 and the assembly gap between the two is smaller after assembly, further improving the limiting effect.

[0142] The outer surface of the second wall 32 is provided with a plurality of longitudinal ridges T, which extend upward from the lower side of the positioning portion Y to the upper side of the positioning portion Y; the inner surface of the vertical wall is provided with a plurality of longitudinal grooves P spaced apart from each other, which extend to the upper end surface of the vertical wall to form a guide groove N; the longitudinal ridge T is inserted into the longitudinal groove P from the guide groove N; the cooperation between the longitudinal ridge T and the longitudinal groove P plays a positioning and guiding role in the insertion of the clamping spring piece 3.

[0143] The provision of the transverse convex ridge Q and the longitudinal convex ridge T increases the strength of the second wall 32 and prevents lateral bending after installation and clamping, thereby affecting dimensional accuracy and elastic force.

[0144] The power module, heat dissipation assembly and power module assembly method provided by the utility model are introduced in detail above. The principle and implementation method of the utility model are explained in this article by using specific examples. The description of the above embodiments is only used to help understand the utility model and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. Clamping spring, characterized in that: comprising a first wall and a second wall opposite to each other formed by bending a plate-like member; The first wall is composed of a plurality of partition walls spaced laterally from each other, and there are spacer grooves between adjacent partition walls; The dividing wall includes, from top to bottom, a first inclined wall, a bent wall, and a second inclined wall; The lower end of the first inclined wall is located on a side of the bent wall close to the second wall; the upper end of the first inclined wall is separated from the upper end of the second wall; The first inclined wall and the second inclined wall are inclined in the same direction; the extension axes of the first inclined wall and the second inclined wall are both at an acute angle to the extension axis of the second wall; The bent wall and the second inclined wall have an arc transition, the bent wall and the second inclined wall form an outwardly convex top contact portion, and the top contact portion has an arc-shaped outer surface; The second wall comprises a vertical action wall opposite to the second inclined wall, the second inclined wall extends downward and is connected to the lower end of the vertical action wall via an arc-shaped curved wall; The arc-shaped curved wall enables the first wall and the second wall to always maintain a trend of expanding outward in opposite directions; The outer surface of the vertical action wall is provided with a positioning portion protruding in a direction away from the top contact portion.

2. The clamping spring according to claim 1, characterized in that: The second wall is laterally continuous and includes a vertical clamping wall, a transverse transition wall and a vertical action wall from top to bottom. The second wall is in a bent shape. The length of the vertical action wall is smaller than that of the second inclined wall. After the second inclined wall approaches the vertical action wall, the bent wall is located above the transverse transition wall.

3. The clamping spring according to claim 1, characterized in that: The positioning portion is composed of a plurality of positioning protrusions spaced apart from each other in a transverse direction, and the positioning protrusions are opposite to the second inclined walls of the partition wall one by one.

4. The clamping spring according to claim 1, characterized in that: The positioning portion is a transverse ridge on the outer surface of the second wall, and the transverse ridge is opposite to the second inclined wall of each of the partition walls; The second wall is continuous in the transverse direction and comprises a vertical clamping wall and a vertical action wall from top to bottom, and the vertical clamping wall and the vertical action wall are located on the same plane.

5. The clamping spring according to claim 1, characterized in that: The lower sections of the second inclined walls are connected to form a transverse continuous wall, and the transverse continuous wall connects the lower ends of the partition walls to each other.

6. The clamping spring according to claim 4, characterized in that: The outer surface of the second wall is provided with a plurality of longitudinal ridges, and the longitudinal ridges extend downward from the upper end of the second wall over the transverse ridges.

7. Compact power module, characterized by: It includes a power device, a heat dissipation base and a clamping spring for fixing the power device; The heat dissipation base comprises a first mounting wall and a second mounting wall, wherein the first mounting wall is a vertical wall; The first mounting wall and the second mounting wall are far away from each other and form a mounting groove; The clamping spring comprises a first wall and a second wall connected by an arc-shaped curved wall; The first wall is composed of a plurality of partition walls spaced laterally from each other, and there are spacer grooves between adjacent partition walls; The dividing wall includes, from top to bottom, a first inclined wall, a bent wall, and a second inclined wall; The first inclined wall and the second inclined wall are inclined in the same direction; the extension axes of the first inclined wall and the second inclined wall are both at an acute angle to the extension axis of the second wall; The upper ends of the first inclined wall and the second wall are separated, and the lower ends of the second inclined wall and the second wall are connected; The curved wall and the second inclined wall transition into an arc to form a convex top contact portion; The outer surface of the second wall is provided with a positioning portion protruding in a direction away from the top contact portion; The first mounting wall of the heat dissipation base is provided with a positioning recess matching the positioning portion; The power device is located between the first mounting wall and the second mounting wall and is close to the first vertical surface of the second mounting wall; The clamping spring is inserted between the power device and the first mounting wall, the top contact portion is tightly against the power device, the vertical action wall of the lower section of the second wall is in contact with the first mounting wall, and the positioning portion is embedded in the positioning recess.

8. The compact power module according to claim 7, characterized in that: The second wall is transversely continuous and includes, from top to bottom, a vertical clamping wall, a transverse transition wall and a vertical action wall; The lower end of the vertical action wall is connected to the second inclined wall, and the outer surface of the vertical action wall is provided with the positioning portion; The vertical clamping wall is located on the upper side of the heat dissipation base, the transverse transition wall is placed on the upper end surface of the first installation wall, and the vertical action wall is inserted into the assembly groove and is tightly attached to the first installation wall.

9. The compact power module according to claim 7, characterized in that: The positioning portion is a plurality of positioning protrusions spaced apart from each other laterally, the positioning protrusions are opposite to the second inclined wall of the partition wall one by one, the positioning recess is a plurality of positioning grooves spaced apart from each other laterally corresponding to the positioning protrusions, the outer surface of the positioning protrusion is an outer convex spherical crown surface, and the bottom surface of the positioning groove is an inner concave spherical crown surface; Or the positioning portion is a plurality of positioning protrusions spaced apart from each other laterally, the positioning protrusions are opposite to the second inclined walls of the partition wall one by one, the positioning recess is a transverse groove, and all the positioning protrusions of the positioning portion can fall into the transverse groove; Or the positioning portion is a transverse ridge on the outer surface of the second wall, the transverse ridge is opposite to the second inclined wall of each partition wall, the positioning recess is a transverse groove matching the transverse ridge, the outer surface of the transverse ridge is an outer convex arc surface, and the bottom surface of the transverse groove is an inner concave arc surface.

10. The compact power module according to claim 7, characterized in that: The outer surface of the second wall is provided with a plurality of longitudinal ridges, and the longitudinal ridges extend upward from the lower side of the positioning portion to the upper side of the positioning portion; The inner surface of the vertical wall is provided with a plurality of longitudinal grooves spaced apart from each other, and the longitudinal grooves extend to the upper end surface of the vertical wall to form guide notches; the longitudinal ridges are inserted into the longitudinal grooves from the guide notches; The cooperation between the longitudinal ridge and the longitudinal groove plays a positioning and guiding role in the insertion of the clamping spring.

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