Semiconductor module, motor controller, and power terminal assembly

Abstract

The utility model provides a kind of semiconductor module, motor controller and power terminal assembly, semiconductor module includes: substrate;Power terminal, power terminal is fixed on substrate, and with substrate electric connection;Shell, shell is connected with substrate, and the via hole for power terminal is passed through and is opened in vertical direction on shell;Circumferential limiting piece, circumferential limiting piece is along horizontal direction and shell is resisted, between second horizontal plate and third horizontal plate along vertical direction, circumferential limiting piece exposes from let -go hole, and circumferential limiting piece is used to be fixed with the fixing member of outside.The utility model's semiconductor module and motor controller, by setting the power terminal and circumferential limiting piece of multiple layers, provide greater buffering strength in vertical direction and can avoid fastening torsional force transmission to power terminal, to prevent power terminal and substrate separate and disconnect electric connection, improve the reliability of semiconductor module, and then improve the reliability of motor controller of the semiconductor module applied.

Description

Technical Field

[0001] This utility model relates to the field of semiconductor devices, specifically to a semiconductor module, a motor controller, and a power terminal assembly. Background Technology

[0002] High-power power electronic drive systems widely employ power modules, which are integrated and packaged from multiple discrete single-transistor semiconductor devices (such as IGBTs and MOSFET chips). These modules offer advantages such as high power density, high integration, and ease of system design. To meet the demands of high current transmission, the output / input terminals of these power modules typically require external electrical connections via low-resistance, high-current-carrying-capacity metal conductors (such as copper busbars).

[0003] As part of the system-level main circuit, the copper busbar needs to form a reliable, low-impedance electrical interconnection with the power terminals on the module. However, the power terminals at the existing copper busbar connections are subjected to high stress, which can easily cause the power terminals to break off from the substrate.

[0004] In view of this, it is necessary to improve the existing semiconductor modules to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a semiconductor module to solve the problem that existing power terminals are prone to disconnection from the substrate when subjected to high stress.

[0006] To achieve the above objectives, this utility model provides a semiconductor module, the semiconductor module comprising:

[0007] substrate; A power terminal is fixed on the substrate and electrically connected to the substrate. The power terminal includes a first horizontal plate, a second horizontal plate, and a third horizontal plate arranged at intervals along the vertical direction, as well as a first connecting member connecting the first horizontal plate and the second horizontal plate, and a second connecting member connecting the second horizontal plate and the third horizontal plate. The first horizontal plate is in contact with the substrate, and the third horizontal plate has a clearance hole through it in the vertical direction for external fixing members to pass through. A housing, which is connected to the substrate, has a through hole extending vertically through the housing for the power terminal to pass through; A circumferential limiting member, which abuts against the housing in the horizontal direction and is located between the second horizontal plate and the third horizontal plate in the vertical direction, is exposed from the clearance hole, and is used to fix with an external fastener; Wherein, the horizontal direction is the direction parallel to the substrate, and the vertical direction is the direction perpendicular to the substrate.

[0008] As a further improvement of this utility model, the circumferential limiting member includes a fastener base and a fastener. The fastener base is provided with a receiving groove. The fastener base is located between the second horizontal plate and the third horizontal plate of the power terminal. The fastener is located in the receiving groove, and the fastener base restricts the rotation of the fastener in the horizontal direction.

[0009] As a further improvement of this utility model, the first connecting member and the second connecting member are respectively connected to both ends of the second horizontal plate.

[0010] As a further improvement of this utility model, the second connecting member is provided with limiting blocks protruding horizontally to both sides, and the limiting blocks abut against the housing.

[0011] As a further improvement of this utility model, the housing is provided with a mounting groove for inserting the fastener base along a direction parallel to the substrate, and the through hole of the housing is arranged adjacent to the mounting groove.

[0012] As a further improvement of this utility model, the fastener base is provided with buckles on both sides. After the fastener base is installed, the housing, which serves as the side wall of the mounting groove, abuts against the buckles.

[0013] As a further improvement of this utility model, the housing is provided with guide walls and retaining walls on both sides of the mounting groove. The guide walls are located on the side of the mounting groove away from the through hole of the housing, and the retaining walls are located on the side close to the through hole. The fastener base is provided with undercuts on both sides. When installing the fastener base, the buckle first abuts against the guide wall in the horizontal direction and slides across the guide wall. After the fastener base is installed, the buckle is engaged with the retaining wall in the horizontal direction, and the retaining wall restricts the fastener base from disengaging from the mounting groove.

[0014] As a further improvement of this utility model, the housing on both sides of the through hole is provided with a limiting block protruding inward, and the fastener base is provided with a limiting notch recessed on the side facing the power terminal. After the fastener base is installed, the limiting notch and the limiting block abut against each other in the vertical direction.

[0015] As a further improvement of this utility model, a support plate is provided in the mounting groove. After the fastener base is installed, the portion of the fastener base protruding from the power terminal abuts against the support plate in the vertical direction.

[0016] As a further improvement of this utility model, the fastener base is provided with a disassembly port, and after the fastener base is installed, the disassembly port is exposed outside the power terminal.

[0017] As a further improvement of this utility model, the fastener base is made of insulating material.

[0018] As a further improvement of this utility model, a buckle is provided on the side of the housing facing the substrate, and the buckle is engaged with the substrate.

[0019] This utility model also provides a motor controller, which includes the semiconductor module as described above.

[0020] As a further improvement of this utility model, the motor controller also includes a PCB, the housing of the semiconductor module is provided with a pin protruding toward the PCB, and the PCB is provided with a pin hole for inserting and engaging with the pin.

[0021] This utility model provides a power terminal assembly, which includes a power terminal and a circumferential limiting member. The power terminal is used to be fixed on a substrate and electrically connected to the substrate. The power terminal includes a first horizontal plate, a second horizontal plate, and a third horizontal plate arranged at intervals along the vertical direction, as well as a first connecting member connecting the first horizontal plate and the second horizontal plate, and a second connecting member connecting the second horizontal plate and the third horizontal plate. The first horizontal plate is used to contact the substrate, and the third horizontal plate is provided with a clearance hole through it in the vertical direction. The clearance hole is used for external fixing members to pass through. The circumferential limiting member is installed vertically between the second horizontal plate and the third horizontal plate of the power terminal. The circumferential limiting member is exposed from the clearance hole and is used to fix to an external fixing member. The horizontal direction is parallel to the substrate, and the vertical direction is perpendicular to the substrate.

[0022] As a further improvement of this utility model, the circumferential limiting member includes a fastener base and a fastener. The fastener base is provided with a receiving groove. The fastener base is located between the second horizontal plate and the third horizontal plate of the power terminal. The fastener is located in the receiving groove, and the fastener base restricts the rotation of the fastener in the horizontal direction.

[0023] As a further improvement of this utility model, the fastener base is provided with a disassembly port, and after the fastener base is installed, the disassembly port is exposed outside the power terminal.

[0024] The beneficial effects of this utility model are as follows: The semiconductor module and motor controller of this utility model, by setting multiple layers of power terminals, provide buffering in the vertical direction, which can buffer the vertical stress brought by the external copper busbar; by setting circumferential limiting members inserted into the multiple layers of power terminals to fix with external fixing members, the circumferential limiting members can absorb the rotational stress generated by the rotation during the fixing of external components and power terminals, which can prevent the tightening torsional force from being transmitted to the power terminals, thereby preventing the power terminals from separating from the substrate and disconnecting the electrical connection, thereby improving the reliability of the motor controller using this semiconductor module. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of the semiconductor module provided by this utility model; Figure 2 yes Figure 1 A magnified structural diagram of region A in the middle; Figure 3 This is a schematic diagram of a semiconductor module after removing the housing and fastener base provided by this utility model; Figure 4 yes Figure 3 The diagram shows the structural structure of the semiconductor module's housing. Figure 5 yes Figure 1 The diagram shows the structural structure of the semiconductor module's housing. Figure 6 yes Figure 5 A magnified structural diagram of region B in the middle; Figure 7 This is a schematic diagram of the structure of a power terminal in a semiconductor module provided by this utility model; Figure 8 This is a schematic diagram of the fastener base in the semiconductor module provided by this utility model; Figure 9 This is a schematic diagram of the structure of the motor controller provided by this utility model.

[0026] In the above figures: 100, motor controller; 1, semiconductor module; 11, substrate; 111, conductive layer; 12, housing; 121, snap-fit; 122, pin; 123, through hole; 124, mounting groove; 1241, limiting block; 1242, support plate; 125, guide wall; 126, holding wall; 13, power terminal; 131, first horizontal plate; 132, second horizontal plate; 133, third horizontal plate; 134, first connector; 135, second connector; 136, clearance hole; 137, limiting block; 14, fastener base; 141, receiving groove; 142, disassembly port; 143, overhang; 144, limiting notch; 15, fastener; 2, PCB. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] like Figures 1 to 4 As shown, the semiconductor module 1 includes a substrate 11, a housing 12, a power terminal 13, and a circumferential limiting member.

[0031] In this embodiment, the vertical direction is defined as the vertical direction, and the direction parallel to the substrate 11 is defined as the horizontal direction.

[0032] Optionally, the substrate 11 can be any one of an aluminum substrate, an IMS (Insulated Metal Substrate) substrate, a ceramic substrate, or a metal composite substrate.

[0033] Optionally, a conductive layer 111 is formed on the substrate 11. The conductive layer includes conductive patterns for electrically connecting the power terminals 13 and power semiconductor devices. The power terminals 13 and power semiconductor devices disposed on the substrate 11 form a power topology through conductive patterns, electrical connectors, etc.

[0034] In some optional embodiments, the power semiconductor device is a power semiconductor chip, which is soldered onto a corresponding conductive pattern on the substrate 11, and the pins of the power semiconductor chip are led out through PIN pins; or, in some embodiments, the power semiconductor device is a power semiconductor device in the form of a plastic package, and the pins of the power semiconductor device are surface mount pins and / or PIN pins.

[0035] The housing 12 is connected to the base plate 11.

[0036] Optionally, when the semiconductor module includes PIN pins, a guide 127 may be provided on the housing 12 for the PIN pins to pass through, the guide 127 being able to guide and correct the PIN pins.

[0037] Optionally, the guide member 127 protrudes towards the side away from the substrate 11. The guide member 127 is hollow and has a through guide hole for the PIN pin to pass through. The guide hole gradually decreases in size towards the side away from the substrate 11, forming a funnel shape. In this embodiment, there are multiple guide members 127. For each PIN pin on the substrate 11, a corresponding guide member 127 is provided on the housing 12.

[0038] The guide hole on the side facing the substrate 11 is larger, which facilitates the insertion of the PIN pin, while the guide hole on the side away from the substrate 11 is smaller, which can limit the PIN pin after it passes through, thus improving the subsequent installation process.

[0039] A through hole 123 is provided on the housing 12 along the vertical direction, and the through hole 123 is used for the power terminal 13 to pass through.

[0040] In this embodiment, the housing 12 can protect the substrate 11 and the devices disposed on the substrate 11, and prevent the substrate from being contaminated or damaged.

[0041] The power terminal 13 is fixed on the substrate 11 and electrically connected to the substrate.

[0042] Optionally, a conductive layer 111 is provided on the substrate, and the power terminal 13 is electrically connected to the conductive layer 111.

[0043] In this embodiment, the power terminal 13 is also used for electrical connection with an external conductive busbar. Optionally, the conductive busbar can be a copper busbar or an aluminum busbar, and is not limited thereto.

[0044] In this embodiment, the number of power terminals 13 on each substrate 11 can be multiple, and the number of circumferential limiting members used in conjunction with the power terminals 13 can also be multiple.

[0045] It should be noted that the power terminal can be located at the edge of the substrate 11 or at a non-edge position on the substrate 11. The setting position of the power terminal is determined according to the actual situation. The setting position of the power terminal in this embodiment is only an illustrative example.

[0046] like Figure 7 As shown, in this embodiment, the power terminal 13 includes a first horizontal plate 131, a second horizontal plate 132 and a third horizontal plate 133 arranged at intervals along the vertical direction, and the first horizontal plate 131 is in contact with the substrate 11.

[0047] The power terminal 13 also includes a first connector 134 and a second connector 135. The first connector 134 connects to the first horizontal plate 131 and the second horizontal plate 132, and the second connector 135 connects to the second horizontal plate 132 and the third horizontal plate 133.

[0048] Optionally, the first horizontal plate 131 is welded to the conductive layer 111 on the substrate 11.

[0049] The third horizontal plate 133 of the power terminal 13 is used to connect with the external conductive busbar. The third horizontal plate 133 has a clearance hole 136 through it in the vertical direction, which is used for external fasteners to pass through.

[0050] When the external conductive busbar is fixed together with the power terminal, pressure or tension is generated in the direction of the substrate 11. Because the power terminal 13 has a multi-layer structure, the buffer strength in the vertical direction is large. The pressure or tension during normal installation and use will not affect the welding strength of the power terminal 13 on the substrate.

[0051] The circumferential limiting member abuts against the housing 12 in the horizontal direction. The circumferential limiting member is located between the second horizontal plate 132 and the third horizontal plate 133 in the vertical direction. The circumferential limiting member is exposed from the clearance hole 136 of the power terminal 13. The circumferential limiting member is used to fix it to the external fixing member.

[0052] By setting a circumferential limiting component, when the power terminal is fixedly engaged with the external fastener, the circumferential torsional force can be prevented from being transmitted to the power terminal 13. The torsional force is only transmitted to the housing 12, thus making it less likely for the power terminal 13 to lose its electrical connection with the substrate 11.

[0053] The semiconductor module provided in this embodiment of the utility model provides greater buffer strength in the vertical direction by setting multiple layers of power terminals 13, which can buffer the vertical stress brought by the external copper busbar; by setting the circumferential limiting member in the multiple layers of power terminals 13 to fix it with the external fixing member, the circumferential limiting member can absorb the rotational stress generated by rotation, which can prevent the tightening torsional force from being transmitted to the power terminals 13, thereby preventing the power terminals 13 from separating from the substrate 11 and disconnecting the electrical connection, thus improving the reliability of the semiconductor module.

[0054] In an optional embodiment of this application, the circumferential limiting member includes a fastener base 14 and a fastener 15. The fastener base 14 is provided with a receiving groove 141 and a disassembly port 142. After the fastener base 14 is installed, it is located between the second horizontal plate 132 and the third horizontal plate 133, and at this time, the disassembly port 142 is exposed outside the power terminal 13. The disassembly port 142 is used to facilitate the removal of the fastener base 14 in subsequent use.

[0055] In an optional embodiment of this application, the fastener base 14 is made of insulating material to avoid electrical conductivity.

[0056] like Figure 2 As shown, the fastener 15 is located in the receiving groove 141, and the fastener base 14 restricts the rotation of the fastener 15 in the horizontal direction.

[0057] In an optional embodiment of this application, the horizontal cross-section of the receiving groove 141 is square. In other embodiments, the cross-section of the receiving groove 141 may also be a shape adapted to the cross-section of the fastener 15, such as a hexagon.

[0058] The clearance hole 136 of the power terminal 13 is used for the fastener to pass through and connect to the fastener 15. The clearance hole 136 and the fastener 15 are coaxially arranged. In an optional embodiment of this application, the fastener is a screw and the fastener 15 is a nut. The screw hole of the fastener 15 is exposed from the clearance hole 136.

[0059] In other alternative embodiments, the fastener 15 may take other forms.

[0060] When the power terminals on the semiconductor module need to be connected to an external conductive bus, the screw passes vertically through the relief hole 136 and is threaded into the fastener 15.

[0061] In other optional embodiments of this application, the circumferential limiting member is an integrated structure. For example, the fastener base 14 and fastener 15 constituting the circumferential limiting member are an integrated structure and cannot be separated; or, the circumferential limiting member is an independent single structure, with threaded holes provided on it for fixed connection with external fasteners, allowing direct threaded connection with external fasteners. The integrated structure of the circumferential limiting member helps reduce the materials used in the semiconductor module assembly process, and reduces assembly steps, improving assembly efficiency.

[0062] Optional, such as Figure 7 As shown, the first connector 134 and the second connector 135 are respectively connected to both ends of the second horizontal plate 132, so that the cross-section of the power terminal 13 is S-shaped.

[0063] In other alternative embodiments, the first connector 134 and the second connector 135 of the power terminal 13 may be located at the same end of the second horizontal plate 132, such that the cross-section of the power terminal 13 is E-shaped.

[0064] Before assembly, the power terminals 13 of the semiconductor module provided in this application are bent into an S-shape or an E-shape, and then the power terminals 13 are soldered to the substrate, which simplifies the process.

[0065] In an optional embodiment of this application, the power terminal 13 is integrally formed; or, in other optional embodiments, the power terminal 13 may be formed by welding multiple metal parts together.

[0066] like Figures 1 to 8 As shown, in an optional embodiment of this application, after the substrate 11 and the housing 12 are installed, the fastener 15 is placed in the receiving groove 141 of the fastener base 14. The fastener base 14 supports the fastener 15 and moves it between the second horizontal plate 132 and the third horizontal plate 133 of the power terminal 13. The screw passes through the relief hole 136 of the power terminal 13 and is threadedly connected to the fastener 15. Because the fastener base 14 restricts the fastener 15 from rotating in the horizontal direction, the force of the screw rotating relative to the fastener 15 is transmitted to the fastener base 14 and not to the power terminal 13, thus not affecting the welding strength of the power terminal 13.

[0067] The power terminal 13, in conjunction with the circumferential limiting component, can buffer the stress brought about by the installation of the external copper busbar. This stress can be tension, thrust, or torsional force brought about by the rotation of the screw, thereby reducing the stress on the solder joint of the power terminal 13.

[0068] like Figure 7As shown, the second connector 135 of the power terminal 13 has a limiting block 137 protruding horizontally to both sides. The limiting block 137 abuts against the housing 12. By setting the limiting block 137, the housing 12 can absorb the pulling force of the copper busbar on the power terminal 13 toward the side away from the substrate 11, and prevent the power terminal 13 from transmitting the pulling force to the substrate 11.

[0069] To better facilitate the installation of the fastener base 14, in an optional embodiment of this application, such as... Figure 5 , Figure 6 As shown, the housing 12 has a mounting groove 124 for inserting the fastener base 14 along the horizontal direction, and the through hole 123 of the housing 12 is arranged adjacent to the mounting groove 124.

[0070] like Figure 8 As shown, the fastener base 14 has buckles 143 on both sides. After the fastener base 14 is installed, the housing, which serves as the side wall of the mounting groove, abuts against the buckles 143. That is, the buckles 143 of the fastener base 14 are interference-fitted with the housing 12 in the horizontal direction to fix the fastener base 14.

[0071] like Figure 6 As shown, in another optional embodiment of this application, the housing 12 is provided with guide walls 125 and retaining walls 126 located on both sides of the mounting groove 124. The guide walls 125 are located on the side of the mounting groove 124 away from the through hole 123, and the retaining walls 126 are located on the side closer to the through hole 123, as shown. Figure 8 As shown, the fastener base 14 has buckles 143 on both sides. When installing the fastener base 14, the buckles 143 first abut against the guide wall 125 and slide across the guide wall 125 in the horizontal direction. After the fastener base 14 is installed, the buckles 143 are locked with the retaining wall 126 in the horizontal direction. The retaining wall 126 restricts the fastener base 14 from disengaging from the mounting groove 124 in the horizontal direction.

[0072] Furthermore, such as Figure 6 As shown, the housing on both sides of the through hole 123 has a limiting block 1241 protruding inward, and the fastener base 14 has a limiting notch 144 recessed on the side facing the power terminal 13. After the fastener base 14 is installed, the limiting notch 144 abuts against the limiting block 1241.

[0073] After the fastener base 14 is installed, one side of the fastener base 14 along the installation direction is limited by the limiting block 1241 on the housing 12, and the other side is limited by the retaining wall 126 on the housing 12. Both sides along the perpendicular to the installation direction are limited by the housing 12 forming the mounting groove 124. At this time, the fastener base 14 is firm, reliable and does not loosen.

[0074] Optional, such as Figure 6As shown, a support plate 1242 is provided in the mounting groove 124. After the fastener base 14 is installed, the part of the fastener base 14 that protrudes from the power terminal 13 abuts against the support plate 1242 in the vertical direction.

[0075] When the limiting block 1241 is provided, the support plate 1242 and the limiting block 1241 are located on both sides of the fastener base 14 in the vertical direction. That is, the support plate 1242 is located below the fastener base 14 and the limiting block 1241 is located above the fastener base 14. The support plate 1242 can support the fastener base 14, thereby eliminating some of the stress on the power terminal 13 in the direction toward the substrate 11. Conversely, the limiting block 1241 can eliminate some of the stress on the power terminal 13 in the direction away from the substrate 11.

[0076] The projection of the clearance hole 136 on the third horizontal plate 133 of the power terminal 13 in the vertical direction falls within the fastener 15. The third horizontal plate 133 limits the fastener 15 in the vertical direction to prevent the fastener 15 from detaching from the fastener base 14.

[0077] In an optional embodiment of this application, the substrate 11, power terminal 13, and fastener base 14 are all independent materials that are then assembled. There is no need to combine the terminals and housing through processes such as injection molding, which simplifies production and makes assembly easier.

[0078] Optional, such as Figure 4 As shown, a buckle 121 protrudes from the side of the housing 12 facing the substrate 11, and the buckle 121 is engaged with the substrate 11.

[0079] In an optional embodiment of this application, the buckle 121 engages with the side of the substrate 11 to fix the substrate 11 and the housing 12.

[0080] In some optional embodiments, the housing 12 and the substrate 11 may be fixed in place by means of adhesive, screws or other methods instead of using snap fasteners.

[0081] like Figure 1 and Figure 9 As shown, this utility model provides a motor controller, the motor controller 100 including a semiconductor module 1.

[0082] Optionally, the motor controller 100 includes at least one semiconductor module 1.

[0083] In optional embodiments of this application, semiconductor module 1 can be a rectifier module and / or an inverter module; it should be noted that semiconductor module can also be a semiconductor module with other functions, which is not limited in this application.

[0084] In one example, the rectifier module and / or inverter module each include a substrate 11, a housing 12, a power terminal 13, and a circumferential limiting member.

[0085] Optionally, the motor controller 100 also includes a PCB2, and the housing 12 of the semiconductor module 1 is provided with a pin 122 protruding toward the PCB, and the PCB is provided with a pin hole for engaging with the pin.

[0086] Semiconductor module 1 is aligned with the PCB by means of pins and pin holes on the PCB. The positioning of pin 122 and pin holes makes it easier for the PIN pins of the semiconductor module to be plugged into the sockets on the PCB.

[0087] An installation method for the motor controller 100 provided in this embodiment of the present invention is as follows: A power terminal 13 with a pre-processed cross-section of S-shape or E-shape is provided; the first horizontal plate 131 of the power terminal 13 is soldered onto the conductive layer 111 of the substrate 11; the substrate 11 and the housing 12 are fastened together; the power terminal 13 passes through the through hole 123 and enters the mounting groove 124; a fastener 15 is placed into the receiving groove 141 of the fastener base 14; the fastener base 14 containing the fastener 15 is installed horizontally into the mounting groove 124 until the clearance hole 136 of the third horizontal plate 133 of the power terminal 13 is aligned with the receiving groove 141; the PCB 2 board is fixed onto the housing 12 of the semiconductor module 1.

[0088] By setting multiple layers of power terminals 13, a large buffer strength is provided in the vertical direction, which can buffer the vertical stress brought by the external copper busbar. By setting the plugged circumferential limiting member in the multiple layers of power terminals 13 to fix it with the external fixing member, the circumferential limiting member can absorb the rotational stress generated by rotation, which can prevent the tightening torsional force from being transmitted to the power terminals 13, thereby preventing the power terminals 13 from separating from the substrate 11 and disconnecting the electrical connection, improving the reliability of the semiconductor module, and thus improving the reliability of the motor controller using the semiconductor module.

[0089] This application provides a power terminal assembly, which includes a power terminal as described above and a circumferential limiting member as described above. The power terminal is used to be fixed on a substrate and electrically connected to the substrate.

[0090] The power terminal includes a first horizontal plate, a second horizontal plate, and a third horizontal plate arranged at intervals along the vertical direction, as well as a first connector connecting the first horizontal plate and the second horizontal plate, and a second connector connecting the second horizontal plate and the third horizontal plate. The first horizontal plate is used to contact the substrate, and the third horizontal plate has a clearance hole through it in the vertical direction for external fixing components to pass through.

[0091] The circumferential limiting member is installed vertically between the second and third horizontal plates of the power terminal. The circumferential limiting member is exposed from the clearance hole and is used to fix it to the external fixing member.

[0092] The horizontal direction is parallel to the substrate, and the vertical direction is perpendicular to the substrate.

[0093] The power terminal assembly provided in this embodiment of the utility model provides greater buffer strength in the vertical direction by setting multiple layers of power terminals, which can buffer the vertical stress brought by the external copper busbar. By setting the circumferential limiting member in the multiple layers of power terminals to fix it with the external fixing member, the circumferential limiting member can absorb the rotational stress generated by rotation, which can prevent the tightening torsional force from being transmitted to the power terminal, thereby preventing the power terminal from separating from the substrate and disconnecting the electrical connection. This is beneficial to improving the reliability of the semiconductor module, and thus improving the reliability of the motor controller using the semiconductor module.

[0094] Optionally, the circumferential limiting component includes a fastener base and a fastener. The fastener base has a receiving groove. The fastener base is located between the second horizontal plate and the third horizontal plate of the power terminal. The fastener is located in the receiving groove, and the fastener base restricts the rotation of the fastener in the horizontal direction.

[0095] Optionally, the fastener base has a disassembly port, which is exposed outside the power terminals after the fastener base is installed.

[0096] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A semiconductor module characterized by comprising: The semiconductor module includes: substrate; A power terminal is fixed on the substrate and electrically connected to the substrate. The power terminal includes a first horizontal plate, a second horizontal plate, and a third horizontal plate arranged at intervals along the vertical direction, as well as a first connecting member connecting the first horizontal plate and the second horizontal plate, and a second connecting member connecting the second horizontal plate and the third horizontal plate. The first horizontal plate is in contact with the substrate, and the third horizontal plate has a clearance hole through it in the vertical direction for external fixing members to pass through. A housing, which is connected to the substrate, has a through hole extending vertically through the housing for the power terminal to pass through; A circumferential limiting member, which abuts against the housing in the horizontal direction and is located between the second horizontal plate and the third horizontal plate in the vertical direction, is exposed from the clearance hole, and is used to fix with an external fastener; Wherein, the horizontal direction is the direction parallel to the substrate, and the vertical direction is the direction perpendicular to the substrate.

2. The semiconductor module according to claim 1, characterized by The circumferential limiting component includes a fastener base and a fastener. The fastener base is provided with a receiving groove. The fastener base is located between the second horizontal plate and the third horizontal plate of the power terminal. The fastener is located in the receiving groove, and the fastener base restricts the rotation of the fastener in the horizontal direction.

3. The semiconductor module according to claim 1 or 2, characterized by The first connector and the second connector are respectively connected to both ends of the second horizontal plate.

4. The semiconductor module according to claim 1 or 2, characterized by The second connector has a limiting block protruding horizontally to both sides, and the limiting block abuts against the housing.

5. The semiconductor module according to claim 2, characterized by The housing has a horizontally oriented mounting groove for inserting the fastener base, and the through hole of the housing is adjacent to the mounting groove.

6. The semiconductor module according to claim 5, characterized by The fastener base has buckles on both sides. After the fastener base is installed, the housing, which serves as the side wall of the mounting groove, abuts against the buckles.

7. The semiconductor module according to claim 5, characterized by The housing is provided with guide walls and retaining walls on both sides of the mounting groove. The guide walls are located on the side of the mounting groove away from the through hole of the housing, and the retaining walls are located on the side close to the through hole. The fastener base is provided with buckles on both sides. When installing the fastener base, the buckle first abuts against the guide wall in the horizontal direction and slides across the guide wall. After the fastener base is installed, the buckle is engaged with the retaining wall in the horizontal direction, and the retaining wall restricts the fastener base from disengaging from the mounting groove.

8. The semiconductor module according to claim 5, characterized by The housing on both sides of the through hole has a limiting block protruding inward. The fastener base has a limiting notch recessed on the side facing the power terminal. After the fastener base is installed, the limiting notch and the limiting block abut against each other in the vertical direction.

9. The semiconductor module according to claim 5, characterized by The mounting slot is provided with a support plate. After the fastener base is installed, the portion of the fastener base that protrudes from the power terminal abuts against the support plate in the vertical direction.

10. The semiconductor module according to claim 2, characterized by The fastener base has a disassembly port, and after the fastener base is installed, the disassembly port is exposed outside the power terminal.

11. The semiconductor module according to claim 2, characterized by The fastener base is made of insulating material.

12. The semiconductor module according to claim 1, characterized by A buckle protrudes from the side of the housing facing the substrate and engages with the substrate.

13. An electric machine controller characterized by The motor controller includes a semiconductor module as described in any one of claims 1 to 12.

14. The motor controller of claim 13, wherein, The motor controller also includes a PCB, and the housing of the semiconductor module is provided with a pin protruding toward the PCB, and the PCB is provided with a pin hole for inserting and engaging with the pin.

15. A power terminal assembly characterized by, The power terminal assembly includes a power terminal and a circumferential limiting member. The power terminal is used to be fixed on the substrate and electrically connected to the substrate. The power terminal includes a first horizontal plate, a second horizontal plate, and a third horizontal plate arranged at intervals along the vertical direction, as well as a first connecting member connecting the first horizontal plate and the second horizontal plate, and a second connecting member connecting the second horizontal plate and the third horizontal plate. The first horizontal plate is used to contact the substrate, and the third horizontal plate is provided with a clearance hole through it in the vertical direction. The clearance hole is used for external fixing members to pass through. The circumferential limiting member is installed vertically between the second horizontal plate and the third horizontal plate of the power terminal. The circumferential limiting member is exposed from the clearance hole and is used to fix to an external fixing member. The horizontal direction is parallel to the substrate, and the vertical direction is perpendicular to the substrate.

16. The power terminal assembly of claim 15, wherein, The circumferential limiting component includes a fastener base and a fastener. The fastener base is provided with a receiving groove. The fastener base is located between the second horizontal plate and the third horizontal plate of the power terminal. The fastener is located in the receiving groove, and the fastener base restricts the rotation of the fastener in the horizontal direction.

17. The power terminal assembly of claim 16, wherein, The fastener base has a disassembly port, and after the fastener base is installed, the disassembly port is exposed outside the power terminal.

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