Power module and vehicle power device

Abstract

The utility model relates to a kind of power module and vehicle power equipment of power module technical field.The power module includes: encapsulation main body;Signal terminal subassembly, signal terminal subassembly includes at least one signal terminal, signal terminal includes the connection section, flexible section and encapsulation section connected in turn, connection section and flexible section are located outside encapsulation main body, part of encapsulation section is located inside encapsulation main body, another part of encapsulation section is located outside encapsulation main body, and it is connected with connection section by flexible section, and connection section is used to connect printed circuit board;Flexible section is suitable for producing elastic deformation when power module and printed circuit board produce relative displacement, to absorb the relative displacement generated by power module and printed circuit board.Signal terminal has flexible section, can absorb the relative displacement generated by power module and printed circuit board, can effectively reduce the cyclic stress of signal terminal in vibration process, reduce the fracture risk of signal terminal, to improve the service life of power module and vehicle power equipment.

Description

Technical Field

[0001] This utility model relates to the field of power module technology, and in particular to a power module and automotive power equipment. Background Technology

[0002] Power modules are components in automotive power equipment, especially as a core component of inverters in new energy vehicles. Their reliability is a decisive factor in the stability of the new energy vehicle drive system. Among them, the reliability of the connection between the power module's signal terminals and the printed circuit board (PCB) is a key and challenging aspect of automotive power equipment design, and the signal terminals are also among the most easily damaged components in the power module.

[0003] Currently, in some power module packaging technologies, the signal terminals of the power module extend from the package body at a 90° angle, and the connection between the signal terminals and the package body has a 90° bend. This causes stress concentration at the joint between the signal terminals and the package body during vibration. If the accumulated damage from vibration exceeds the allowable limit of the signal terminal material, the signal terminal may break. The current mainstream solution is to add a fixing layer at the bottom of the joint between the signal terminal and the package body, i.e., applying a rigid fixing adhesive. Although this patching method reduces vibration stress, the application of rigid fixing adhesive is technically challenging, increasing both material and assembly costs. Furthermore, the rigid fixing adhesive's strong constraint on the signal terminal's position increases the difficulty of assembling the signal terminal with the printed circuit board. Utility Model Content

[0004] This utility model provides a power module and automotive power equipment to solve the technical problem of easily damaged signal terminals, thereby improving the service life of the power module and automotive power equipment and reducing costs.

[0005] To achieve the above and other related objectives, this utility model provides a power module, comprising:

[0006] Encapsulation body;

[0007] A signal terminal assembly includes at least one signal terminal, the signal terminal including a connecting segment, a flexible segment and an encapsulation segment connected in sequence, the connecting segment and the flexible segment being located outside the encapsulation body, a portion of the encapsulation segment being located inside the encapsulation body, and another portion of the encapsulation segment being located outside the encapsulation body and connected to the connecting segment through the flexible segment, the connecting segment being used to connect a printed circuit board;

[0008] The flexible segment is adapted to undergo elastic deformation when the power module and the printed circuit board are displaced relative to each other, so as to absorb the relative displacement between the power module and the printed circuit board.

[0009] In one embodiment of the present invention, the flexible segment has a curved portion, the first end of the curved portion is connected to the connecting segment, and a first rounded corner is provided at the connection point, and the second end of the curved portion is connected to the encapsulation segment.

[0010] In one embodiment of the present invention, the flexible segment further has a straight portion, the second end of the curved portion is connected to the encapsulation segment through the straight portion, and a second rounded corner is provided at the connection between the second end of the curved portion and the straight portion, and a third rounded corner is provided at the connection between the straight portion and the encapsulation segment.

[0011] In one embodiment of the present invention, the curved portion is an arc structure, the arc structure is located between the first rounded corner and the second rounded corner, and the radius of the arc structure is R4. The radii R1 of the first rounded corner, the radius R2 of the second rounded corner and the radius R3 of the third rounded corner are all smaller than the radius R4 of the arc structure.

[0012] In one embodiment of this utility model, 0.4mm≤R1≤1mm; 0.4mm≤R2≤1mm; 0.4mm≤R3≤1mm; 2.5mm≤R4≤3mm.

[0013] In one embodiment of the present invention, the width D1 of the first end of the curved portion is equal to the width D2 of the connecting segment, the width D3 of the second end of the curved portion is equal to the width D4 of the straight portion, the width D3 of the second end of the curved portion is greater than the width D1 of the first end of the curved portion, and an arc-shaped transition area is provided at the position where the width changes to smoothly transition.

[0014] In one embodiment of the present invention, the signal terminal assembly includes two signal terminals arranged side by side, the two signal terminals being a first signal terminal and a second signal terminal, the curved portion of the first signal terminal having a first side away from the second signal terminal, and the arcuate transition area disposed on the first side of the first signal terminal having a connected first arc segment and a second arc segment.

[0015] In one embodiment of the present invention, the curved portion of the second signal terminal has a first side close to the first signal terminal and a second side away from the first signal terminal, the arc-shaped transition area disposed on the first side of the second signal terminal has a connected third arc segment and a fourth arc segment, and the arc-shaped transition area disposed on the second side of the second signal terminal has a connected fifth arc segment and a sixth arc segment.

[0016] In one embodiment of this utility model, the radius of the first arc segment is R5, 3mm≤R5≤5mm; the radius of the second arc segment is R6, 3mm≤R6≤5mm; the radius of the third arc segment is R7, 15mm≤R7≤17mm; the radius of the fourth arc segment is R8, 3mm≤R8≤5mm; the radius of the fifth arc segment is R9, 3mm≤R9≤5mm; and the radius of the sixth arc segment is R10, 3mm≤R10≤5mm.

[0017] In one embodiment of the present invention, the radius R5 of the first arc segment, the radius R6 of the second arc segment, the radius R8 of the fourth arc segment, the radius R9 of the fifth arc segment, and the radius R10 of the sixth arc segment are equal to and less than the radius R7 of the third arc segment.

[0018] To achieve the above and other related objectives, this utility model also provides an automotive power device, including a printed circuit board and a power module as described above, wherein the connection section of the signal terminal is electrically connected to the printed circuit board.

[0019] The beneficial effects of this utility model are as follows: The power module and automotive power equipment proposed in this utility model have a flexible segment in the signal terminal, which can absorb the relative displacement generated between the power module and the printed circuit board. This can effectively reduce the cyclic stress of the signal terminal during vibration, reduce the risk of breakage of the signal terminal, and extend the service life of the signal terminal, thereby improving the service life of the power module and automotive power equipment. It also eliminates the need to apply hard fixing adhesive, simplifying the process and reducing costs. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0021] In the attached diagram:

[0022] Figure 1 This is a schematic diagram of the structure of a power module provided in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 Front view of the medium power module;

[0024] Figure 3 for Figure 2 Enlarged schematic diagram of a local structure in the middle;

[0025] Figure 4 for Figure 1 Side view of the medium power module;

[0026] Figure 5 for Figure 4 Enlarged schematic diagram of a local structure in the middle;

[0027] Figure 6 This is a schematic diagram showing the connection between a power module and a printed circuit board according to an embodiment of the present invention.

[0028] The attached figures are labeled as follows:

[0029] The package body 1, signal terminal assembly 2, first signal terminal 21, second signal terminal 22, connecting section 23, flexible section 24, bending section 2401, straight section 2402, first rounded corner 2403, second rounded corner 2404, third rounded corner 2405, first arc segment 2406, second arc segment 2407, third arc segment 2408, fourth arc segment 2409, fifth arc segment 2410, sixth arc segment 2411, packaging section 25, and printed circuit board 3. Detailed Implementation

[0030] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0031] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0032] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0033] Please see Figure 1 and Figure 6In one optional embodiment, the present invention provides a vehicle power device, which includes a power module and a printed circuit board 3, wherein the connection section 23 of the signal terminal of the power module is electrically connected to the printed circuit board 3.

[0034] Optionally, automotive power equipment may be an inverter, rectifier, or boost converter.

[0035] See Figures 1 to 6 In one optional embodiment, the present invention provides a power module including a package body 1 and a signal terminal assembly 2. The signal terminal assembly 2 includes at least one signal terminal, which comprises a connecting segment 23, a flexible segment 24, and a package segment 25 connected in sequence. The connecting segment 23 and the flexible segment 24 are located outside the package body 1, a portion of the package segment 25 is located inside the package body 1, and another portion of the package segment 25 is located outside the package body 1 and connected to the connecting segment 23 via the flexible segment 24. The connecting segment 23 is used to connect to a printed circuit board 3 and is electrically connected to the printed circuit board 3. The flexible segment 24 is adapted to undergo elastic deformation when the power module and the printed circuit board 3 experience relative displacement, thereby absorbing the relative displacement between them. Especially when the power module encounters vibration during use, relative displacement will occur between the package body 1 and the printed circuit board 3. The flexible segment 24 of the signal terminal can generate elastic deformation to absorb the relative displacement between the package body 1 and the printed circuit board 3, thereby reducing the cyclic stress on the signal terminal during vibration, improving the fatigue life of the signal terminal, reducing the risk of breakage of the signal terminal, extending the service life of the signal terminal, and thus helping to improve the service life of the power module. In addition, the flexible segment 24 of the signal terminal can reduce the cyclic stress during vibration, eliminating the need for complex processes such as applying hard fixing adhesive to improve performance, which helps to reduce assembly difficulty and cost.

[0036] See Figure 1 , Figure 4 and Figure 5 In an optional embodiment, the flexible segment 24 has a bending portion 2401, the first end of which is connected to the connecting segment 23 and a first rounded corner 2403 is provided at the connection, and the second end of the bending portion 2401 is connected to the encapsulation segment 25.

[0037] Optionally, the second end of the curved portion 2401 is directly connected to the encapsulation segment 25, and the connection is smoothly transitioned by a rounded corner. Alternatively, the flexible segment 24 also has a straight portion 2402, the second end of the curved portion 2401 is connected to the encapsulation segment 25 through the straight portion 2402, and the connection between the second end of the curved portion 2401 and the straight portion 2402 is provided with a second rounded corner 2404, and the connection between the straight portion 2402 and the encapsulation segment 25 is provided with a third rounded corner 2405.

[0038] Optionally, the connecting segment 23, the straight portion 2402, and the encapsulation segment 25 are in a straight shape. Further, the connecting segment 23 is parallel to the straight portion 2402, and the straight portion 2402 is perpendicular to the encapsulation segment 25.

[0039] Optionally, the radius of the first fillet 2403 is R1, where 0.4mm ≤ R1 ≤ 1mm. Further, R1 can be any value among 0.4mm, 0.5mm, 0.7mm, or 1mm.

[0040] Optionally, the radius of the second fillet 2404 is R2, where 0.4mm ≤ R2 ≤ 1mm. Further, R2 can be any value among 0.4mm, 0.5mm, 0.7mm, or 1mm.

[0041] Optionally, the radius of the third fillet 2405 is R3, where 0.4mm ≤ R3 ≤ 1mm. Further, R3 can be any value among 0.4mm, 0.5mm, 0.7mm, or 1mm.

[0042] Optionally, the curved portion 2401 is an arc structure located between the first rounded corner 2403 and the second rounded corner 2404, with a radius of R4. The radii R1 of the first rounded corner 2403, R2 of the second rounded corner 2404, and R3 of the third rounded corner 2405 are all smaller than the radius R4 of the arc structure. The radius R4 of the curved portion 2401 is larger than that of R1, R2, and R3, allowing the curved portion 2401 to effectively absorb the relative displacement caused by vibration, thereby improving the effect of reducing vibration stress. Furthermore, 2.5mm ≤ R4 ≤ 3mm; for example, R4 can be any value among 2.5mm, 2.6mm, 2.8mm, or 3mm.

[0043] It should be noted that the radii R1 of the first fillet 2403, R2 of the second fillet 2404, and R3 of the third fillet 2405 may be equal or unequal; in addition, the values ​​of the radii R1 of the first fillet 2403, R2 of the second fillet 2404, R3 of the third fillet 2405, and R4 of the curved portion 2401 are not limited to the values ​​exemplified in the above embodiments, and the specific values ​​can be adjusted according to actual applications.

[0044] The power module in the above embodiment, through the cooperation of the first rounded corner 2403, the second rounded corner 2404 and the third rounded corner 2405, enables a smooth transition at the connection point of the connecting section 23, the flexible section 24 and the encapsulation section 25, which helps to reduce vibration stress. In addition, the flexible section 24 has a bending portion 2401, which helps to further improve the absorption of relative displacement, thereby further reducing vibration stress and reducing the risk of signal terminal breakage or cracking.

[0045] See Figures 1 to 4 In an optional embodiment, the width D1 of the first end of the curved portion 2401 is equal to the width D2 of the connecting segment 23, the width D3 of the second end of the curved portion 2401 is equal to the width D4 of the straight portion 2402, the width D3 of the second end of the curved portion 2401 is greater than the width D1 of the first end of the curved portion 2401, and the curved portion 2401 is provided with an arc transition area at the position where the width changes to smoothly transition.

[0046] Optionally, the width D4 of the straight portion 2402 is equal to the width of the encapsulation segment 25, or the width D3 of the second end of the curved portion is equal to the width of the encapsulation segment 25.

[0047] Optionally, the signal terminal assembly 2 includes two signal terminals arranged side by side, namely a first signal terminal 21 and a second signal terminal 22. The curved portion 2401 of the first signal terminal 21 has a first side away from the second signal terminal 22. The arcuate transition area on the first side of the first signal terminal 21 has a connected first arc segment 2406 and a second arc segment 2407. Further, the first arc segment 2406 and the second arc segment 2407 are connected and smoothly transitioned, and the first arc segment 2406 and the second arc segment 2407 are distributed sequentially from the first end to the second end of the curved portion 2401 of the first signal terminal 21.

[0048] Optionally, the curved portion 2401 of the second signal terminal 22 has a first side close to the first signal terminal 21 and a second side away from the first signal terminal 21. The arcuate transition area on the first side of the second signal terminal 22 has connected third arcuate segments 2408 and 2409, and the arcuate transition area on the second side of the second signal terminal 22 has connected fifth arcuate segments 2410 and 2411. Further, the third arcuate segments 2408 and 2409 are connected and smoothly transitioned, and are sequentially distributed from the first end to the second end of the curved portion 2401 of the second signal terminal 22; the fifth arcuate segments 2410 and 2411 are connected and smoothly transitioned, and are sequentially distributed from the first end to the second end of the curved portion 2401 of the second signal terminal 22.

[0049] Optionally, the radius of the first arc segment 2406 is R5, where 3mm ≤ R5 ≤ 5mm. Furthermore, R5 can be any value among 3mm, 3.5mm, 4mm, or 5mm.

[0050] Optionally, the radius of the second arc segment 2407 is R6, where 3mm ≤ R6 ≤ 5mm. Furthermore, R6 can be any value among 3mm, 3.5mm, 4mm, or 5mm.

[0051] Optionally, the radius of the third arc segment 2408 is R7, where 15mm ≤ R7 ≤ 17mm. Furthermore, R7 can be any value among 15mm, 15.5mm, 16mm, or 17mm.

[0052] Optionally, the radius of the fourth arc segment 2409 is R8, where 3mm≤R8≤5mm; furthermore, R8 can be any value among 3mm, 3.5mm, 4mm or 5mm.

[0053] Optionally, the radius of the fifth arc segment 2410 is R9, where 3mm≤R9≤5mm; furthermore, R9 can be any value among 3mm, 3.5mm, 4mm or 5mm.

[0054] Optionally, the radius of the sixth arc segment 2411 is R10, where 3mm ≤ R10 ≤ 5mm. Furthermore, R10 can be any value among 3mm, 3.5mm, 4mm, or 5mm.

[0055] It should be noted that the values ​​of the radius R5 of the first arc segment 2406, the radius R6 of the second arc segment 2407, the radius R7 of the third arc segment 2408, the radius R8 of the fourth arc segment 2409, the radius R9 of the fifth arc segment 2410, and the radius R10 of the sixth arc segment 2411 are not limited to the values ​​exemplified in the above embodiments. The specific values ​​can be adjusted according to actual applications.

[0056] Optionally, the radii R5 of the first arc segment 2406, R6 of the second arc segment 2407, R8 of the fourth arc segment 2409, R9 of the fifth arc segment 2410, and R10 of the sixth arc segment 2411 are equal to and less than the radius R7 of the third arc segment 2408.

[0057] For example, in one specific embodiment, the radius R1 of the first rounded corner 2403 is 0.5 mm, the radius R2 of the second rounded corner 2404 and the radius R3 of the third rounded corner 2405 are equal, both being 0.6 mm, the radius R4 of the bent portion 2401 is 2.8 mm, the radius R5 of the first arc segment 2406, the radius R6 of the second arc segment 2407, the radius R8 of the fourth arc segment 2409, the radius R9 of the fifth arc segment 2410 and the radius R10 of the sixth arc segment 2411 are equal, all being 4 mm, the radius R7 of the third arc segment 2408 is 16 mm, and the stress of the first signal terminal 21 and the second signal terminal 22 during vibration can be reduced by about 70% compared to the signal terminal without the flexible segment 24.

[0058] In the power module of the above embodiment, the curved portion 2401 has a region with varying width, which is beneficial for forming a gap area of ​​appropriate size between the first signal terminal 21 and the second signal terminal 22. The gap area can provide operating space for the connection and assembly of the signal terminal assembly 2 and the package body 1, making operation convenient. In addition, the curved portion 2401 is provided with an arc-shaped transition area at the position of the width variation to achieve a smooth transition, which is beneficial for reducing stress concentration in the region of the curved portion 2401. This helps to prevent the curved portion 2401 from becoming the starting point of fracture, and further helps to prevent cracks or fractures in the region of the curved portion 2401 when the power module encounters vibration during use.

[0059] The power module and automotive power equipment of this utility model have a signal terminal with a flexible segment 24 that can effectively absorb the relative displacement caused by vibration when the power module encounters vibration during use, thereby reducing vibration stress and helping to avoid cracks or breaks in the signal terminal, thus reducing the risk of damage to the signal terminal, improving the service life of the power module and automotive power equipment and reducing costs.

[0060] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A power module, characterized in that, include: Encapsulation body; A signal terminal assembly includes at least one signal terminal, the signal terminal including a connecting segment, a flexible segment and an encapsulation segment connected in sequence, the connecting segment and the flexible segment being located outside the encapsulation body, a portion of the encapsulation segment being located inside the encapsulation body, and another portion of the encapsulation segment being located outside the encapsulation body and connected to the connecting segment through the flexible segment, the connecting segment being used to connect a printed circuit board; The flexible segment is adapted to undergo elastic deformation when the power module and the printed circuit board are displaced relative to each other, so as to absorb the relative displacement between the power module and the printed circuit board.

2. The power module according to claim 1, characterized in that, The flexible segment has a curved portion, the first end of which is connected to the connecting segment and has a first rounded corner at the connection, and the second end of which is connected to the encapsulation segment.

3. The power module according to claim 2, characterized in that, The flexible segment also has a straight portion, the second end of the curved portion is connected to the encapsulation segment through the straight portion, and the connection between the second end of the curved portion and the straight portion is provided with a second rounded corner, and the connection between the straight portion and the encapsulation segment is provided with a third rounded corner.

4. The power module according to claim 3, characterized in that, The curved portion is an arc structure located between the first rounded corner and the second rounded corner, and the radius of the arc structure is R4. The radii of the first rounded corner R1, the second rounded corner R2, and the third rounded corner R3 are all smaller than the radius of the arc structure R4.

5. The power module according to claim 4, characterized in that, 0.4mm≤R1≤1mm; 0.4mm≤R2≤1mm; 0.4mm≤R3≤1mm; 2.5mm≤R4≤3mm.

6. The power module according to claim 3, characterized in that, The width D1 of the first end of the curved portion is equal to the width D2 of the connecting segment, the width D3 of the second end of the curved portion is equal to the width D4 of the straight portion, the width D3 of the second end of the curved portion is greater than the width D1 of the first end of the curved portion, and an arc-shaped transition area is provided at the position where the width changes to smoothly transition.

7. The power module according to claim 6, characterized in that, The signal terminal assembly includes two signal terminals arranged side by side, namely a first signal terminal and a second signal terminal. The curved portion of the first signal terminal has a first side away from the second signal terminal, and the arcuate transition area disposed on the first side of the first signal terminal has a connected first arc segment and a second arc segment.

8. The power module according to claim 7, characterized in that, The curved portion of the second signal terminal has a first side close to the first signal terminal and a second side away from the first signal terminal. The arcuate transition area disposed on the first side of the second signal terminal has a connected third arc segment and a fourth arc segment. The arcuate transition area disposed on the second side of the second signal terminal has a connected fifth arc segment and a sixth arc segment.

9. The power module according to claim 8, characterized in that, The radius of the first arc segment is R5, 3mm≤R5≤5mm; the radius of the second arc segment is R6, 3mm≤R6≤5mm; the radius of the third arc segment is R7, 15mm≤R7≤17mm; the radius of the fourth arc segment is R8, 3mm≤R8≤5mm; the radius of the fifth arc segment is R9, 3mm≤R9≤5mm; and the radius of the sixth arc segment is R10, 3mm≤R10≤5mm.

10. The power module according to claim 8 or 9, characterized in that, The radii R5 of the first arc segment, R6 of the second arc segment, R8 of the fourth arc segment, R9 of the fifth arc segment, and R10 of the sixth arc segment are equal to and less than the radius R7 of the third arc segment.

11. A vehicle power device, characterized in that, Includes a printed circuit board and a power module as described in any one of claims 1 to 10, wherein the connection segment of the signal terminal is electrically connected to the printed circuit board.

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