IGBT device

Abstract

The utility model discloses an IGBT device, and belongs to the technical field of semiconductors, the IGBT device is used for being connected with a circuit board, the IGBT device comprises a main body part, a leading-out terminal and a vibration reduction assembly, the leading-out terminal is connected to the main body part, and the vibration reduction assembly is connected with the leading-out terminal and the circuit board; the circuit board and the leading-out terminal are connected through the vibration reduction assembly, when the circuit board is excited by vibration and achieves modal resonance, large amplitude can be generated, the vibration reduction assembly can absorb part of vibration, vibration pulling of the circuit board to the leading-out terminal is reduced, and therefore the possibility that the connecting position of the leading-out terminal and the main body part is broken is reduced, and the service life of the circuit board is prolonged. And the vibration reliability of the controller is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of semiconductor, and particularly relates to an IGBT device. BACKGROUND

[0002] The whole vehicle controller, namely the power assembly controller, is a core control component of a new energy vehicle, and the reliability thereof is directly related to the operation safety of the vehicle, so that a random vibration matching experiment needs to be carried out after the controller is packaged. The controller comprises an IGBT single tube and a PCB board, the pin of the IGBT single tube is welded with the PCB board, and in the experiment process, when the controller is excited by vibration, the PCB board generates a modal resonance phenomenon, a large amplitude is generated, the IGBT single tube is subjected to periodic pulling, and the root of the pin is broken, thereby affecting the vibration reliability of the controller. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at solving the technical problem that the root of the pin of the IGBT single tube is broken in the process that the controller is subjected to the random vibration matching experiment, and the vibration reliability of the controller is affected.

[0004] Technical scheme: the IGBT device provided by the embodiment of the application is used for connecting a circuit board, the IGBT device comprises a main body part, a lead-out terminal and a damping assembly, the lead-out terminal is connected to the main body part, and the damping assembly is connected to the lead-out terminal and the circuit board respectively.

[0005] In some embodiments, the damping assembly comprises an elastic piece, and the elastic piece is electrically connected to the circuit board and the lead-out terminal respectively.

[0006] In some embodiments, the elastic piece is provided with a through hole, and at least part of the lead-out terminal is arranged in the through hole.

[0007] In some embodiments, the damping assembly comprises a sleeve and a spring, the sleeve is connected to the circuit board and has a containing cavity, the spring is arranged in the containing cavity and connected to the sleeve;

[0008] One end of the lead-out terminal, which is away from the main body part, is arranged in the containing cavity and connected to the spring, and the lead-out terminal is gap-fitted with the sleeve through the containing cavity.

[0009] In some embodiments, the circuit board is provided with a connecting hole penetrating in a first direction, and at least part of the damping assembly is arranged in the connecting hole.

[0010] In some embodiments, the damping assembly is fixed to the circuit board in an interference fit manner through the connecting hole.

[0011] Alternatively, the damping assembly is bonded to the circuit board.

[0012] In some embodiments, the circuit board is provided with a connecting hole penetrating in the first direction, and the elastic member is arranged through the connecting hole.

[0013] The elastic member is provided with a first protrusion and a second protrusion arranged at intervals in the first direction, and the first protrusion and the second protrusion are arranged on both sides of the circuit board in the first direction and abut against the circuit board.

[0014] In some embodiments, the first protrusion and / or the second protrusion include an end face and a guide face, the end face abuts against the circuit board, and the guide face is arranged around the end face, and in the second direction, the minimum size between one end of the guide face close to the end face and the lead terminal is greater than the minimum size between one end of the guide face away from the end face and the lead terminal.

[0015] In some embodiments, the sleeve is welded to the circuit board.

[0016] In some embodiments, the damping assembly includes:

[0017] A buffer terminal extending along an S-shaped or wavy trajectory in the first direction, or the buffer terminal extending spirally in the first direction, and the buffer terminal is connected to the lead terminal.

[0018] An extension terminal connecting one end of the buffer terminal away from the lead terminal and the circuit board.

[0019] Beneficial effects: the IGBT device of the embodiments of the present application connects the circuit board and the lead terminal through the damping assembly, when the circuit board is excited by vibration and reaches modal resonance, a large amplitude will be generated, the damping assembly can absorb part of the vibration, so that the vibration pulling of the circuit board on the lead terminal is reduced, thereby reducing the possibility of fracture at the connection position of the lead terminal and the main body, and improving the vibration reliability of the controller. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 The structural schematic diagram of the IGBT device provided by the embodiments of the present application is shown in the figure.

[0022] Figure 2 The structural schematic diagram of the IGBT device provided by the embodiments of the present application is shown in the figure.Figure 1 Enlarged view at A;

[0023] Figure 3 Schematic view of another structure of the damping assembly provided by the embodiment of the present application;

[0024] Figure 4 Schematic view of the structure of the elastic member provided by the embodiment of the present application;

[0025] Figure 5 Schematic view of the structure of the first boss and the second boss provided by the embodiment of the present application;

[0026] Figure 6 Schematic view of another structure of the first boss and the second boss provided by the embodiment of the present application;

[0027] Figure 7 Schematic view of another structure of the damping assembly provided by the embodiment of the present application;

[0028] Fig. 1 is a schematic view of the main body part; Fig. 2 is a schematic view of the lead terminal; Fig. 3 is a schematic view of the damping assembly; Fig. 4 is a schematic view of the circuit board; Fig. 5 is a schematic view of the water-cooling plate. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] In the description of the present application, it should be understood that the terms "height", "thickness", "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "multiple" is two or more, at least one of which can be one, two or more, unless otherwise specifically limited.

[0031] It should be noted that in the drawings of the embodiments of the present application, the arrow marked X represents the first direction X, and the arrow marked Y represents the second direction Y. The first direction X and the second direction Y are introduced to more clearly represent the structure and relative position relationship of the components in the IGBT device. In actual application, the first direction X and the second direction Y can change according to the different placement modes of the IGBT device.

[0032] As a prologue of the embodiments of the present application, the vehicle controller, i.e. the power assembly controller, is a core control component of a new energy vehicle, including an IGBT single tube and a PCB board. The IGBT single tube is welded at the bottom of the water-cooled plate, and the pin of the IGBT single tube is welded with the PCB board above. In the experiment, when the controller is excited by vibration, the PCB board will produce modal resonance phenomenon, resulting in a large amplitude, so that the IGBT single tube is subjected to periodic pulling, causing the root of the pin to break, affecting the vibration reliability of the controller.

[0033] Please refer to Figure 1 The IGBT device of the embodiments of the present application is used for connecting the circuit board 4. The IGBT device includes a main body part 1, a lead terminal 2 and a damping assembly 3. The main body part 1 is used for being welded on the water-cooled plate 5. The lead terminal 2 is connected with the main body part 1. The damping assembly 3 is connected with the lead terminal 2 and the circuit board 4 respectively. The main body part 1 realizes electrical connection with the circuit board 4 through the lead terminal 2 and the damping assembly 3.

[0034] In the embodiments, the circuit board 4 is located at one side of the main body part 1 along the first direction X. The first direction X is the thickness direction of the circuit board 4. The lead terminal 2 is divided into two sections. One section extends along the first direction X and is electrically connected with the circuit board 4 through the damping assembly 3. The other section extends along the second direction Y and is electrically connected with the main body part 1. The second direction Y intersects with the first direction X. The intersection means that the first direction X and the second direction Y are distributed at an angle. The angle is 85°-95°, and is preferably 90°.

[0035] In the case that the circuit board 4 produces a large amplitude due to modal resonance, the damping assembly 3 between the lead terminal 2 and the circuit board 4 can greatly attenuate vibration, so as to reduce the vibration pulling of the circuit board 4 on the lead terminal 2, thereby reducing the possibility of fatigue fracture of the connection position of the lead terminal 2 and the main body part 1 due to stress concentration, and improving the vibration reliability of the controller.

[0036] In some embodiments, the damping assembly 3 comprises elastic members 31 electrically connecting the circuit board 4 and the lead terminal 2 respectively. The elastic members 31 are made of conductive rubber, such as graphite-nickel-filled silicone rubber, aluminum-silver-filled silicone rubber, nickel-silver-filled silicone rubber, graphite-filled silicone rubber, etc. The conductive rubber has conductivity, elasticity and flexibility. The elasticity of the conductive rubber enables the elastic members 31 to absorb and relieve mechanical stress, and the flexibility of the conductive rubber enables the elastic members 31 to bend and twist without breaking or failing, thereby fully adapting to the connection of the lead terminal 2 and the circuit board 4 in a vibrating environment.

[0037] Please refer to Figure 1 and Figure 2 In some embodiments, the elastic members 31 are provided with through holes 310 extending through the elastic members 31 along the first direction X, and at least part of the lead terminal 2 is arranged in the through holes 310 and connected with the elastic members 31.

[0038] In the present embodiment, the lead terminal 2 is connected with the elastic members 31 in an interference fit manner through the through holes 310. Interference fit is a mechanical connection method in which the sizes of two parts are designed to interfere when assembled. This type of fit provides a high-strength connection by achieving a tight fit through elastic deformation of the material, that is, the elastic members 31 are elastically deformed under the extrusion of the lead terminal 2, and the lead terminal 2 is tightly clamped by the elastic deformation force, thereby achieving stable connection of the lead terminal 2 and the elastic members 31. The connection is convenient and fast, and at the same time, the lead terminal 2 is in contact with the inner hole wall of the through hole 310, increasing the contact area between the two, which is beneficial to enhancing the reliability of the electrical connection. In other embodiments, the lead terminal 2 can also be connected with the inner hole wall of the through hole 310 by conductive glue or back glue, and can also be connected with the elastic members 31 by crimping.

[0039] Please refer to Figure 3 In some embodiments, the damping assembly 3 comprises a sleeve 32 and a spring 33. The sleeve 32 is made of metal and is connected to the circuit board 4, so that the sleeve 32 and the circuit board 4 are electrically connected. The sleeve 32 has a receiving cavity 320, and the opening of the receiving cavity 320 is arranged on the plane where the main body 1 is located in the first direction X. The spring 33 is arranged in the receiving cavity 320 and connected with the sleeve 32.

[0040] The one end of the lead-out terminal 2 away from the main body part 1 is arranged in the accommodating cavity 320 and connected with the spring 33, and the lead-out terminal 2 is gap-fitted with the sleeve 32 through the accommodating cavity 320. The gap-fitting is a mechanical fitting mode in which there is a certain gap between two parts after assembly, and such fitting allows relative movement between the parts, that is, a certain relative movement can occur between the lead-out terminal 2 and the sleeve 32 in the case of vibration of the controller, and in the case of relative movement, the spring 33 will be stretched or compressed to produce elastic deformation.

[0041] In the embodiment, the sleeve 32 includes an inner bottom wall and an inner peripheral wall, the inner peripheral wall is arranged around the inner bottom wall, and the two walls surround to form the accommodating cavity 320, one end of the spring 33 is connected with the inner bottom wall or the inner peripheral wall, and the other end is connected with the end of the lead-out terminal 2. When the circuit board 4 is excited by vibration to generate a large amplitude, the spring 33 can play a damping effect to reduce the vibration pull of the circuit board 4 on the lead-out terminal 2, and play a protection role on the IGBT device.

[0042] Please combine Figure 2 and Figure 3 In some embodiments, the circuit board 4 is provided with a connecting hole 41 penetrating in the first direction X, and at least part of the damping assembly 3 is arranged in the connecting hole 41. Specifically, the elastic member 31 and / or the sleeve 32 are inserted into the connecting hole 41 and electrically connected with the circuit board 4, and the displacement between them is limited by the insertion fitting, which can play a role in positioning and enhancing the stability of the connection.

[0043] Please combine Figure 2 and Figure 3 In some embodiments, the damping assembly 3 is fixed to the circuit board 4 in an interference fit through the connecting hole 41, or the damping assembly 3 is bonded to the circuit board 4. Specifically, the elastic member 31 and / or the sleeve 32 are interference-fitted with the connecting hole 41, and are fixed by the mutual tight fitting force, which is convenient for connection. In the case of bonding, the elastic member 31 and / or the sleeve 32 can be bonded with conductive glue, or in a partially bonded form, to ensure that the elastic member 31 and / or the sleeve 32 can be in electrical contact with the circuit board 4.

[0044] Please combine Figure 2 and Figure 4 In some embodiments, the circuit board 4 is provided with a connecting hole 41 penetrating in the first direction X, and the elastic member 31 is arranged in the connecting hole 41, that is, the two ends of the elastic member 31 are distributed on both sides of the circuit board 4 in the first direction X.

[0045] The elastic member 31 is provided with first bosses 311 and second bosses 312 arranged at intervals along the first direction X, the first bosses 311 and the second bosses 312 are arranged on both sides of the circuit board 4 along the first direction X and abut against the circuit board 4, and the through hole 310 penetrates the first bosses 311 and the second bosses 312.

[0046] In the embodiment, the first bosses 311 and the second bosses 312 are integrally formed with the elastic member 31, and therefore the first bosses 311 and the second bosses 312 also have electrical conductivity, elasticity and flexibility, the size of each of the first bosses 311 and the second bosses 312 near one end of the circuit board 4 is greater than the inner diameter of the connecting hole 41, so that the first bosses 311 and the second bosses 312 clamp the circuit board 4, reducing the possibility of the elastic member 31 being separated from the connecting hole 41, and helping to improve the reliability of the electrical connection between the lead terminal 2 and the circuit board 4. When the elastic member 31 is installed, the first bosses 311 or the second bosses 312 are deformed by being squeezed, so as to pass through the connecting hole 41 until the elastic member 31 is clamped in the connecting hole 41.

[0047] In other embodiments, the first bosses 311 and / or the second bosses 312 can also be a split structure with the elastic member 31, and are fixed to each other by bonding. When the elastic member 31 is installed, the elastic member 31 is first inserted into the connecting hole 41, and then the first bosses 311 and / or the second bosses 312 are bonded with the elastic member 31 to clamp the circuit board 4.

[0048] Please refer to Figure 4 , Figure 5 and Figure 6 In some embodiments, the first bosses 311 and / or the second bosses 312 include an end face 313 and a guide face 314, wherein the end face 313 abuts against the circuit board 4, and the guide face 314 is arranged around the end face 313, in the second direction Y, the minimum size between the end of the guide face 314 close to the end face 313 and the lead terminal 2 is greater than the minimum size between the end of the guide face 314 away from the end face 313 and the lead terminal 2, and the outer diameter of the end of the guide face 314 away from the end face 313 is less than the inner diameter of the connecting hole 41. In the embodiment, the guide face 314 is a conical face, in the case that the first boss 311 has the guide face 314, it can guide the first boss 311 to enter the connecting hole 41 more easily when it is inserted into the connecting hole 41, facilitating the positioning of the elastic member 31; the second boss 312 has the guide face 314 in the same way as the first boss 311, which will not be described here. In other embodiments, the guide face 314 can also be a multi-faceted structure connected in sequence, and the whole is conical.

[0049] Please refer to Figure 3In some embodiments, the sleeve 32 is welded to the circuit board 4. The welding not only provides an electrical connection, but also provides reliable support for the sleeve 32, reducing the risk of loose connection under certain stress and vibration conditions.

[0050] Please refer to Figure 7 In some embodiments, the damping assembly 3 includes a buffer terminal 34 and an extension terminal 35, the buffer terminal 34 extends along a S-shaped or wavy trajectory in the first direction X, or the buffer terminal 34 extends helically in the first direction X, the buffer terminal 34 is connected with the lead-out terminal 2, and the extension terminal 35 is connected to an end of the buffer terminal 34 away from the lead-out terminal 2 and the circuit board 4.

[0051] The S-shaped, wavy or helical buffer terminal 34 functions like a spring 33 or a shock absorber, and can absorb part of the vibration energy, thereby reducing the amplitude of the vibration transmitted to the lead-out terminal 2, and protecting the lead-out terminal 2.

[0052] In the embodiment, the circuit board 4 is provided with a connecting hole 41, and the extension terminal 35 is arranged through the connecting hole 41 and electrically connected with the circuit board 4. In other embodiments, the extension terminal 35 can also be directly welded to the circuit board 4.

[0053] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0054] The IGBT device provided by the embodiments of the present application is described in detail above, and the principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the technical solutions of the present application and the core idea thereof; those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An IGBT device, characterized by, The IGBT device for connecting a circuit board (4) comprises a main body (1), a lead terminal (2) connected to the main body (1), and a damping assembly (3) connected to the lead terminal (2) and the circuit board (4) respectively.

2. The IGBT device of claim 1, wherein, The damping assembly (3) comprises an elastic member (31) electrically connected to the circuit board (4) and the lead terminal (2) respectively.

3. The IGBT device of claim 2, wherein, The elastic member (31) is provided with a through hole (310), and at least part of the lead terminal (2) is arranged in the through hole (310).

4. The IGBT device of claim 1, wherein, The damping assembly (3) comprises a sleeve (32) connected to the circuit board (4) and having a receiving cavity (320), and a spring (33) arranged in the receiving cavity (320) and connected to the sleeve (32). The end of the lead terminal (2) away from the main body (1) is arranged in the receiving cavity (320) and connected to the spring (33), and the lead terminal (2) is gap-fitted with the sleeve (32) through the receiving cavity (320).

5. The IGBT device according to any one of claims 1 to 4, characterized in that, The circuit board (4) is provided with a connecting hole (41) penetrating in a first direction, and at least part of the damping assembly (3) is arranged in the connecting hole (41).

6. The IGBT device of claim 5, wherein, The damping assembly (3) is fixed to the circuit board (4) in an interference fit through the connecting hole (41). Alternatively, the damping assembly (3) is bonded to the circuit board (4).

7. The IGBT device according to claim 2 or 3, characterized in that, The circuit board (4) is provided with a connecting hole (41) penetrating in a first direction, and the elastic member (31) is arranged in the connecting hole (41). The elastic member (31) is provided with a first boss (311) and a second boss (312) arranged in the first direction, the first boss (311) and the second boss (312) are arranged on both sides of the circuit board (4) in the first direction and abut against the circuit board (4).

8. The IGBT device of claim 7, wherein, The first boss (311) and / or the second boss (312) comprise an end face (313) and a guide face (314), the end face (313) abuts against the circuit board (4), and the guide face (314) is arranged around the end face (313), and in a second direction, the minimum size between the end close to the end face (313) of the guide face (314) and the lead terminal (2) is greater than the minimum size between the end away from the end face (313) of the guide face (314) and the lead terminal (2).

9. The IGBT device of claim 4, wherein, The sleeve (32) is welded to the circuit board (4).

10. The IGBT device of claim 1, wherein, The damping assembly (3) comprises: a buffer terminal (34) extending along an S-shaped or wavy trajectory in a first direction, or the buffer terminal (34) extends spirally in a first direction, and the buffer terminal (34) is connected to the lead terminal (2); an extension terminal (35) connected to the end of the buffer terminal (34) away from the lead terminal (2) and the circuit board (4).

Images