Electronic module, in particular an electronic power module for hybrid vehicles or electric vehicles

Abstract

For an electronic module (1), in particular an electronic power module for hybrid vehicles or electric vehicles, comprising a first circuit board (10) with an upper side (11) and an underside (12) facing away from the upper side (11), wherein a plug-in connector (40) for making electrical contact with the first circuit board (10) is arranged on the first circuit board (10), further comprising an electronics unit (20), in particular a power electronics unit, wherein the electronics unit (20) is arranged on the underside (12) of the first circuit board (10), wherein the electronics unit (20) is electrically contacted by means of a flexible second circuit board (30), wherein the flexible second circuit board (30) comprises a connection region (31) with a plug-in region (32), wherein the plug-in region (32) of the flexible second circuit board (30) is plugged into the plug-in connector (40) of the first circuit board (10) in a plug-in direction (R), and the electronics unit (20) is therefore placed in electrical contact with the first circuit board (10), it is proposed that the plug-in connector (40) of the first circuit board (10) is arranged on the underside (12) of the first circuit board (10), wherein the connection region (31) of the flexible second circuit board (30) comprises at least one gripping region (33), wherein the gripping region (33) projects beyond the plug-in region (32) in the plug-in direction (R), wherein the gripping region (33) protrudes through a recess (13) in the first circuit board (10) from the underside (12) of the first circuit board (10) to the upper side (11) of the first circuit board (10).

Description

[0001] Description

[0002] title

[0003] Electronic assembly, in particular an electronic power assembly for

[0004] Hybrid vehicles or electric vehicles

[0005] State of the art

[0006] The invention relates to an electronic assembly, in particular an electronic power assembly for hybrid vehicles or electric vehicles, having the features of the preamble of independent claim 1.

[0007] In hybrid vehicles or electric vehicles, inverter structures and converter structures with commutation circuits consisting of intermediate circuit capacitors and half-bridges, which are implemented, for example, in power modules, are used. For example, inverters are used to operate an electric machine, providing phase currents for the electric machine.

[0008] The power modules are controlled via a circuit board that is electrically connected to the power modules.

[0009] Disclosure of the invention

[0010] According to the invention, an electronic assembly, in particular an electronic power assembly for hybrid vehicles or electric vehicles, is proposed. The electronic assembly comprises a first printed circuit board having a top side and a bottom side facing away from the top side, wherein a connector for electrically contacting the first printed circuit board is arranged on the first printed circuit board. Furthermore, the electronic assembly comprises an electronic unit, in particular a power electronic unit, wherein the electronic unit is arranged on the bottom side of the first printed circuit board, wherein the electronic unit is electrically contacted by means of a flexible second printed circuit board, wherein the flexible second printed circuit board comprises a connection area with a plug-in area,wherein the plug-in region of the flexible second printed circuit board is plugged into the plug-in connector of the first printed circuit board in a plug-in direction and the electronic unit is thus electrically contacted with the first printed circuit board, wherein the plug-in connector of the first printed circuit board is arranged on the underside of the first printed circuit board, wherein the connecting region of the flexible second printed circuit board comprises at least one gripping region, wherein the gripping region protrudes beyond the plug-in region in the plug-in direction, wherein the gripping region protrudes through a recess in the first printed circuit board from the underside of the first printed circuit board to the top side of the first printed circuit board.

[0011] Advantages of the invention

[0012] Compared to the prior art, the electronic assembly according to the invention has the advantage that the first circuit board can be connected to the electronics unit and electrically contacted particularly easily and effectively. The electronics unit is electrically contacted with the first circuit board via the flexible second circuit board. In the present electronic assembly, this can advantageously take place on the underside of the first circuit board, which faces the electronics unit. The plug-in area of ​​the flexible second circuit board can advantageously be plugged into the plug connector of the first circuit board on the underside of the first circuit board. The gripping area, which projects through the recess in the first circuit board from the underside of the first circuit board to the top side of the first circuit board, allows the connection area of ​​the flexible second circuit board to also be gripped on the top side of the first circuit board.The plug-in area of ​​the flexible second circuit board can therefore be plugged into the connector of the first circuit board on the underside of the first circuit board by pulling on the gripping area on the top side of the first circuit board. The plug-in area and the connector are arranged between the first circuit board and the electronics unit and are not or only with difficulty accessible and visible. The gripping area on the top side of the first circuit board still allows the plug-in area to be plugged into the connector. This makes "blind insertion" of the plug-in area into the connector possible. The recess in the first circuit board means that the connection area is already aligned with the plug-in area in the direction of the connector. The plug-in area can therefore be plugged into the connector by pulling the gripping area away from the top side of the first circuit board.The process of inserting the plug-in area into the connector can advantageously be carried out from the top side of the first circuit board, even though the plug and connector are arranged on the underside of the first circuit board. The top side of the circuit board is significantly more accessible for this process. The process cannot be carried out directly on the underside of the first circuit board, as the electronics unit there makes access difficult or impossible. Thus, the electronic assembly continues to have an advantageously compact design, as the connector can be arranged on the underside of the first circuit board and the plug-in area of ​​the flexible second circuit board can be inserted from the underside of the first circuit board.The plug-in area of ​​the flexible second circuit board does not need to be routed through or past the first circuit board to the top of the first circuit board, where it can then be plugged into a connector on the first circuit board. This advantageously saves space on the first circuit board and allows for a more compact design.

[0013] Further advantageous embodiments and developments of the inventions are made possible by the features specified in the subclaims.

[0014] According to an advantageous embodiment, at least two gripping areas are formed on the flexible second circuit board, wherein the plug-in area of ​​the flexible second circuit board and the plug-in connector are arranged between the gripping areas of the second circuit board. By means of the two gripping areas, which each protrude, for example, through a recess in the first circuit board from the underside of the first circuit board to the top side of the first circuit board, the plug-in area can be plugged straight and reliably into the plug-in connector. The connection area can be gripped at both gripping areas on both sides of the plug-in area and the plug-in connector and pulled away from the top side of the first circuit board, such that the plug-in area is plugged into the plug-in connector.According to an advantageous embodiment, the plug-in area and / or the gripping area are designed as a rigid area of ​​the flexible second circuit board. Thus, the gripping area and the plug-in area are rigidly connected to one another, and the direction in which the plug-in area is inserted into the connector corresponds to the direction in which the connecting area is pulled by the gripping areas. The plug-in area can thus be securely and easily aligned on the underside of the first circuit board by the gripping areas on the top side of the first circuit board and inserted into the connector.

[0015] According to an advantageous exemplary embodiment, a centering device is arranged between the first printed circuit board and the electronics unit, wherein the flexible second printed circuit board is guided through a centering opening of the centering device, in particular in the plug-in direction, and the plug-in region of the flexible second printed circuit board is thus aligned, wherein at least one centering element is formed on the centering device, which is in contact with the first printed circuit board and by means of which the first printed circuit board is aligned with the centering device. The centering device advantageously allows the connection region of the flexible second printed circuit board to be well positioned relative to the first printed circuit board and to the electronics unit. The centering opening in the centering device places the plug-in region in the correct position and aligns it in the plug-in direction with the connector.The centering element aligns the first circuit board and thus the connector on the underside of the first circuit board relative to the plug-in area of ​​the flexible second circuit board.

[0016] According to an advantageous embodiment, the centering element is designed as a pin that extends through an alignment opening formed in the first circuit board. Thus, when the first circuit board is placed on the centering device, for example, it can be aligned with the centering element relative to the centering device and the plug-in area of ​​the flexible second circuit board.

[0017] According to an advantageous embodiment, the centering device is designed as a plate, in particular as a carrier plate for the first circuit board. Thus, the centering device serves, on the one hand, as a carrier plate for the first circuit board and, on the other hand, for aligning the plug-in area of ​​the flexible second circuit board relative to the first circuit board and thus to the connector of the first circuit board.

[0018] According to an advantageous embodiment, a holding device for holding and aligning the connecting area of ​​the flexible second printed circuit board is formed on the electronics unit. The holding device advantageously allows the connecting area of ​​the flexible second printed circuit board to be aligned and held in the direction of the connector before the plug-in area is inserted into the connector.

[0019] According to an advantageous embodiment, the connecting region of the flexible second printed circuit board is held in a first position by the holding device and aligned in the insertion direction, and the connecting region of the flexible second printed circuit board can be released from the holding device by pulling on the gripping region in the insertion direction. Thus, the connecting region can be aligned in the first position to arrange the centering device on the electronics unit, wherein, when arranging the centering device on the electronics unit, the connecting region of the flexible second printed circuit board is guided through the centering opening in the centering device.

[0020] According to an advantageous embodiment, the holding device comprises a first holding part and a second holding part, wherein the first holding part and the second holding part are spaced apart by a gap, wherein the connecting region of the flexible second printed circuit board can be clamped into the gap between the first holding part and the second holding part, such that the connecting region is held by the holding device and aligned in the insertion direction. In this way, a holding device is provided in which the connecting region is aligned towards the centering opening in the centering device and towards the connector before the plug-in region is inserted into the connector.When the gripping area is pulled, the connecting area of ​​the flexible second printed circuit board can then be pulled out of the space between the first holding part and the second holding part, and the plug-in area can be plugged into the connector. Once the plug-in area is plugged into the connector, the holding device no longer holds the connecting area. According to an advantageous exemplary embodiment, a locking element is formed on the first holding part and / or on the second holding part, which projects into the space, wherein a locking opening complementary to the locking element is formed on the connecting area of ​​the flexible printed circuit board, in which locking opening the locking element can be latched.The locking element serves to hold the connection area on the holding device and advantageously ensures that the connection area is only released from the holding device by pulling on the gripping area when inserting the plug-in area into the connector.

[0021] Short description of the drawing

[0022] Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description.

[0023] Fig. 1 shows an embodiment of the electronic assembly in which the plug-in area of ​​the flexible second circuit board is plugged into the connector and the connecting area of ​​the flexible second circuit board is not held by the holding device,

[0024] Fig. 2 shows a cross section through the embodiment of the electronic assembly shown in Fig. 1,

[0025] Fig. 3 shows an embodiment of the electronic unit with holding device, the flexible second circuit board and the connector, wherein the plug-in area of ​​the flexible second circuit board is not plugged into the connector and the connection area of ​​the flexible second circuit board is held by the holding device.

[0026] Embodiments of the invention

[0027] The electronic assembly 1 according to the invention can be used in a variety of ways, for example, as an inverter or converter in automotive engineering. For example, the electronic assembly can be designed as an inverter, also referred to as an inverter, and can be used, for example, to operate an electrical machine, for example, in hybrid or electric vehicles.

[0028] Fig. 1 shows an embodiment of the electronic assembly 1. Fig. 2 shows a corresponding cross-section through the embodiment of the electronic assembly from Fig. 1. The electronic assembly 1 comprises a first printed circuit board 10 with a top side 11 and a bottom side 12 facing away from the top side 11. The electronic assembly 1 further comprises a flexible second printed circuit board 30 and an electronics unit 20. The first printed circuit board 10 serves, for example, to control the electronics unit 20. The flexible second printed circuit board 30 is electrically contacted both with the first printed circuit board 10 and with the electronics unit 20. The conductor tracks of the flexible second printed circuit board 30 serve, for example, to transmit signals for controlling the electronics unit 20.

[0029] The electronics unit 20 can be, for example, a power electronics unit. In this exemplary embodiment, the electronics unit 20 comprises a sealed housing. A carrier substrate, for example, is arranged in the housing, and electrical and / or electronic components are arranged on the carrier substrate. The carrier substrate can be, for example, a circuit carrier, in this exemplary embodiment, a DBC (Direct Bonded Copper) substrate. However, the carrier substrate can also be, for example, an AMB (Active Metal Brazed) substrate, an IMS (Insulated Metal Substrate), a printed circuit board (PCB), or another substrate suitable for power modules.Various electrical and / or electronic components, such as power semiconductors such as field-effect transistors such as MIS-FETs (Metal Insulated Semiconductor Field-Effect Transistors), IGBTs (Insulated-Gate Bipolar Transistors), power MOSFETs (Metal Oxide Semiconductor Field-Effect Transistors), and / or diodes, such as rectifier diodes, can be arranged on the carrier substrate. Furthermore, passive components such as resistors or capacitors can also be arranged on the carrier substrate as electrical and / or electronic components. The carrier substrate can further comprise conductor tracks not shown in the figures. The conductor tracks of the carrier substrate can, as in this exemplary embodiment, be designed as conductor surfaces that can carry high currents.The electrical and / or electronic components can be electrically connected to one another or to other electrical and / or electronic elements arranged outside the electronics unit 20 and not shown in the figures, for example via the conductor tracks of the carrier substrate, via bonding wires, or other suitable electrically conductive contact elements, for example by soldering or sintering. The electronics unit 20 has connection points at which the electronics unit 20 is electrically contacted by the flexible second printed circuit board 30.

[0030] The electronic assembly 1 may further comprise a heat sink (not shown in the figures) by which the electronic unit 20 is cooled. The heat sink may, for example, be made of a material with good thermal conductivity, such as aluminum or copper. The heat sink may, for example, be formed as a plate. Structures such as fins, pins, or channels may be formed on the heat sink, for example, to improve heat dissipation.

[0031] The electronic assembly 1 further comprises a first printed circuit board 10. The first printed circuit board 10 has a top side 11 and a bottom side 12 facing away from the top side 11. The first printed circuit board 10 is arranged in the electronic assembly 1 such that the bottom side 12 of the first printed circuit board 10 faces the electronics unit 20. The first printed circuit board 10 can, for example, be a rigid printed circuit board, for example a printed circuit board in FR4 design or higher, for example a printed circuit board made of glass fiber reinforced epoxy resin. However, the first printed circuit board 10 can also be an HDI printed circuit board (High Density Interconnect printed circuit board), an LTCC (Low Temperature Cofired Ceramics) or another suitable rigid or flexible printed circuit board.The first printed circuit board 10 comprises, for example, one or more electrical and / or electronic components connected to one another by conductor tracks not shown in the figures and also not shown in the figures, which together form, for example, a control circuit for the electronics unit 20.

[0032] A connector 40 is arranged on the first circuit board 10. The connector 40 is provided for electrically contacting the first circuit board 10. For this purpose, a plug-in area 32 can be plugged into the connector 40. The connector 40 contains a plurality of contact points which are provided for contacting conductor tracks of the flexible second circuit board 30. The contact points in the connector 40 serve for electrically contacting the first circuit board 10. If the plug-in area 32 of the second flexible circuit board 30 is plugged into the connector 40, electrical connections are established between the contact points in the connector 40 and the conductor tracks of the second flexible circuit board 30. In this exemplary embodiment, the circuit board 10 is designed as a control circuit which is provided for controlling the electronics unit 20.For this purpose, the contact points in the connector 40 of the printed circuit board 10 are electrically connected to connection points of the electronics unit 20 by means of the flexible second printed circuit board 30. The connector 40 is arranged on the underside 12 of the first printed circuit board 10. The connector 40 faces the electronics unit 20. The connector 40 is fastened to the underside 12 of the first printed circuit board 10. The connector 40 protrudes from the underside 12 of the first printed circuit board toward the electronics unit 20. To accommodate the plug-in area 32 of the second flexible printed circuit board 30, the connector 40 has a receiving opening that faces the electronics unit 2. The connector 40 can be designed, for example, as an FPC connector.

[0033] The electronic assembly 1 further comprises a flexible second printed circuit board 30. The flexible second printed circuit board 30 can, for example, be designed as an FPC (flexible printed circuit), in particular as an FPC connector. The flexible second printed circuit board 30 has, for example, considerable plastic bending capacity. The flexible second printed circuit board 30 serves to connect electronic assemblies. Here, the electronic assembly arranged on the first printed circuit board 10 is connected to the electronics unit 20 by the second flexible printed circuit board 30. The flexible second printed circuit board 30 can, for example, comprise a printed circuit constructed on a flexible plastic carrier, for example polyimide, Mylar, nylon, or polyester film. Copper, for example, can serve as the conductor material. The contact areas can also be gold-plated, for example.The flexible second circuit board 30 has a region arranged on the electronics unit 20, where it is electrically connected to connection points of the electronics unit 20. The flexible second circuit board 30 can, for example, be welded to the connection points of the electronics unit 20.

[0034] Furthermore, the flexible second circuit board 30 has a connection region 31, at which the flexible second circuit board 30 is electrically connected to the first circuit board 10. The connection region 31 of the second flexible circuit board 10 comprises a plug-in region 32 and at least one gripping region 33. In the exemplary embodiment illustrated in the figures, the connection region comprises one plug-in region 32 and two gripping regions 33. The plug-in region 32 is arranged between the two gripping regions 33. The plug-in region 32 is designed to electrically contact the flexible second circuit board 30 with the connector 40 of the first circuit board 10. For this purpose, contact points are formed on the plug-in region 32 of the flexible second circuit board 30. The contact points on the plug-in region 32 of the flexible second circuit board 30 are, for example, ends of conductor tracks in the flexible second circuit board 30.The plug-in area 32 of the flexible second printed circuit board 30 is plugged into the connector 40 of the first printed circuit board 10 in a plug-in direction R. Thus, the contact points of the plug-in area 32 are in electrically conductive contact with the contact points of the connector 40, and the flexible second printed circuit board 30 is thus electrically conductively connected to the first printed circuit board 10. The plug-in direction R denotes the direction in which the plug-in area 31 of the flexible second printed circuit board 30 is plugged into the connector 40. The plug-in direction R is, for example, perpendicular to the first printed circuit board 10.

[0035] The plug-in region 32 and the gripping regions 33 are each flat, for example, and extend flatly in the same plane. The plug-in region 32 and the gripping regions 33 extend in the plug-in direction R. The plug-in region 32 is, for example, essentially rectangular. The gripping regions 33 are, for example, each tongue-shaped. The plug-in region 32 and the gripping regions 33 are formed in the same plane, with the plug-in region 32 being arranged in the plane between the two gripping regions 33. The gripping regions 33 extend beyond the plug-in region 32 in the plug-in direction R. At the ends of the gripping regions 33, which are arranged on the top side 11 of the first circuit board 10, a structure can be formed which facilitates gripping the gripping region 33.In the embodiment illustrated here, a recess is formed in each of the gripping areas 33, into which a gripping tool can engage. The connecting area 31 with the plug-in area 32 and the gripping areas 33 is, for example, essentially fork-shaped.

[0036] The connection area 31 with the plug-in area 32 and the gripping areas 33 forms one end of the flexible second circuit board 30, at which end the flexible circuit board 30 is connected to the first circuit board 10. The connection area 31 with the plug-in area 32 and the gripping areas 33 is designed as a rigid area of ​​the flexible second circuit board 30. The flexible second circuit board 30 is stiffened in the connection area 31 and is thus rigid in the connection area 31. The plug-in area 32 is plugged into the plug connector 40 on the underside 12 of the first circuit board 10 and is thus arranged on the underside 12 of the first circuit board 10. The gripping areas 33 protrude next to the plug connector 40 in the plug-in direction R through recesses 13 in the first circuit board 10 to the top side 11 of the first circuit board 10. A recess 13 is provided in the first circuit board 10 for each gripping area 33.In the exemplary embodiment illustrated here, the circuit board 10 comprises two recesses 13 for the gripping areas 33. The connector 40 is arranged between the two recesses 13. The recesses 13 are designed, for example, as slots in the first circuit board 10. The slots extend, for example, in a direction perpendicular to the plug-in direction R, in which the receptacle for the plug-in area 32 in the connector 40 also extends. The gripping areas 33 protrude from the recesses 13 on the top side 11 of the first circuit board 10, so that they can be gripped on the top side 11.

[0037] The electronic assembly 1 further comprises a centering device 50. The centering device 50 is arranged between the first circuit board 10 and the electronics unit 20. The centering device 50 is plate-shaped, for example. The centering device 50 can also serve, for example, as a carrier plate for the first circuit board 10. The flexible second circuit board 30 runs through the centering device 50. For this purpose, a centering opening 51 is formed in the centering device 50. The centering opening 51 is slot-shaped, for example. The flexible second circuit board 30 runs through the centering opening 51 in the centering device 50, in particular in the plug-in direction R. Because the flexible second circuit board 30 is guided through the centering opening 51 in the plug-in direction R, the connection region 31 of the flexible second circuit board 30 is also aligned in the plug-in direction R.The centering device 50 can comprise an additional element 55, which is arranged in the centering device 50, which is designed, for example, as a plate, and in which the centering opening 51 is formed. The centering opening 50 can, for example, be at least partially funnel-shaped and become narrower in the plug-in direction R away from the electronics unit 2. In this way, the flexible second printed circuit board 30 can be inserted particularly well and easily into the centering opening 51 of the centering device 50 from the side of the centering device 50 facing the electronics unit 2. Furthermore, projections (not shown in the drawings) can be provided next to the centering opening 51, which serve to guide and align the flexible second printed circuit board 30 in the plug-in direction R.

[0038] The first circuit board 10 is aligned with the centering device 50. The first circuit board 10 is aligned with the centering device 50 in such a way that the flexible circuit board 30 protrudes simultaneously through the centering opening 51 in the centering device 50 and the recesses 13 in the first circuit board 10. Centering elements 52, which are designed as pins, for example, are formed on the centering device 50. The centering elements 52 protrude in the plug-in direction R from the centering device 50 in the direction of the first circuit board 10. The centering elements 52 of the centering device 50 serve to align the first circuit board 10 relative to the centering device 50. The centering elements 52 can, for example, protrude through alignment openings 14 in the first circuit board 10. Thus, the first circuit board 10 can be aligned with the centering elements 52 and thus with the centering device 50.

[0039] Furthermore, the centering device 50 is aligned relative to the electronics unit 20. For this purpose, the electronic assembly 1 can comprise further components, not shown in the figures, that establish a connection between the centering device 50 and the electronics unit 2. For example, the electronics unit 2 can be connected to the centering unit 50 via a heat sink and / or a housing and thus aligned relative to it.

[0040] Furthermore, the electronics unit 20 can comprise a holding device 60. The holding device 60 is designed to hold the flexible second printed circuit board 30 and to align it in the plug-in direction R. The holding device 60 aligns the connecting region 31 of the flexible second printed circuit board 30 in the plug-in direction R such that the connecting region 31 protrudes through the centering opening 51 in the centering device 50 and the recesses 13 in the first printed circuit board 10. The connecting region 31 of the flexible second printed circuit board 30 can be clipped into the holding device 60 and thus fastened to the electronics unit 20 and aligned in the plug-in direction R.If the centering device 50 and the first circuit board 10 are mounted above the electronics unit 20, the connecting region 31 of the flexible second circuit board 30 passes through the centering opening 51 of the centering device 50 and the recesses 13 in the first circuit board 10. Once the centering device 50 and the first circuit board 10 are then mounted, a gripping tool can grip the gripping regions 33 of the connecting region 31 on the top side 11 of the first circuit board 10 and pull the connecting region 31 in the direction of the plug-in direction R, so that the plug-in region 32 is plugged into the connector 40. The holding device 60 on the electronics unit 20 is designed such that the connecting region 31 is released from the holding device 60 when the gripping regions 33 are pulled in the plug-in direction R. For this purpose, the holding device 60 can, for example, comprise one or more clips.The holding device can, for example, as in the exemplary embodiment shown here, comprise a first holding part 61 and a second holding part 62. The first holding part 61 and the second holding part 62 protrude, for example, in the plug-in direction R. The first holding part 61 and the second holding part 62 are spaced from one another by a gap 63. The plug-in region 31 of the flexible second printed circuit board 30 is partially arranged in the gap 63 between the first holding part 61 and the second holding part 62. The plug-in region 31 of the flexible second printed circuit board 30 is arranged, for example, between the first holding part 61 and the second holding part 62. The connection region 31 is thus held by the holding device 60 and aligned in the plug-in direction R. Furthermore, a locking element 64, for example a locking lug, can be formed on the first holding part 61 and / or on the second holding part 62.Furthermore, a locking opening 35 complementary to the locking element 64 can be formed in the connecting region 31 of the flexible second printed circuit board 30, into which the locking element 64 can be locked. The locking element 64 protrudes, for example, into the intermediate space 63. If the connecting region 31 is locked, it is aligned in the plug-in direction R. By pulling the gripping regions 33 in the plug-in direction R, the connecting region 31 is released from the locking in the holding device 60, and the plug-in region 32 is inserted into the connector 40.

[0041] Of course, further embodiments and mixed forms of the embodiments shown are possible.

Claims

Claims 1. Electronic assembly (1), in particular an electronic power assembly for hybrid vehicles or electric vehicles, comprising a first printed circuit board (10) with a top side (11) and a bottom side (12) facing away from the top side (11), wherein a connector (40) for electrical contacting the first printed circuit board (10) is arranged on the first printed circuit board (10), further comprising an electronic unit (20), in particular a power electronic unit, wherein the electronic unit (20) is arranged on the bottom side (12) of the first printed circuit board (10), wherein the electronic unit (20) is electrically contacted by means of a flexible second printed circuit board (30), wherein the flexible second printed circuit board (30) comprises a connection area (31) with a plug-in area (32),wherein the plug-in area (32) of the flexible second circuit board (30) is plugged into the connector (40) of the first circuit board (10) in a plug-in direction (R) and the electronic unit (20) is thus electrically contacted with the first circuit board (10), characterized in that the connector (40) of the first circuit board (10) is arranged on the underside (12) of the first circuit board (10), wherein the connection area (31) of the flexible second circuit board (30) comprises at least one gripping area (33), wherein the gripping area (33) projects beyond the plug-in area (32) in the plug-in direction (R), and wherein the gripping area (33) projects through a recess (13) in the first circuit board (10) from the underside (12) of the first circuit board (10) to the top side (11) of the first circuit board (10).

2. Electronic assembly according to claim 1, characterized in that at least two gripping areas (33) are formed on the flexible second circuit board (30), wherein the plugging area (32) of the flexible second circuit board (30) and the connector (40) are arranged between the gripping areas (33) of the second circuit board (32).

3. Electronic assembly according to one of the preceding claims, characterized in that the plug-in area (32) and / or the gripping area (33) are designed as a rigid area of ​​the flexible second circuit board (30).

4. Electronic assembly according to one of the preceding claims, characterized in that a centering device (50) is arranged between the first printed circuit board (10) and the electronic unit (20), wherein the flexible second printed circuit board (30) is passed through a centering opening (51) of the centering device (50), in particular in the plug-in direction (R), and thus the plug-in area (32) of the flexible second printed circuit board (30) is aligned, wherein at least one centering element (52) is formed on the centering device (50), which is in contact with the first printed circuit board (10) and by which the first printed circuit board (10) is aligned on the centering device (50).

5. Electronic assembly according to claim 4, characterized in that the centering element (52) is designed as a pin (52) which projects through an alignment opening (14) formed in the first circuit board (10).

6. Electrical assembly according to one of the preceding claims, characterized in that the centering device (50) is designed as a plate, in particular as a carrier plate for the first circuit board (10).

7. Electronic assembly according to one of the preceding claims, characterized in that a holding device (60) for holding and aligning the connection area (31) of the flexible second circuit board (30) is formed on the electronic unit (20).

8. Electronic assembly according to claim 7, characterized in that the connection area (31) of the flexible second circuit board (30) is held in a first position by the holding device (60) and is aligned in the insertion direction (R) and the connection area (31) of the flexible second circuit board (30) can be released from the holding device (60) by pulling on the gripping area (33) in the insertion direction (R).

9. Electronic assembly according to one of claims 7 or 8, characterized in that the holding device (60) comprises a first holding part (61) and a second holding part (62), wherein the first holding part (61) and the second holding part (62) are spaced apart by an intermediate space (63), wherein the connecting area (31) of the flexible second circuit board (30) can be clamped into the intermediate space (63) between the first holding part (61) and the second holding part (62), so that the The connection area (31) is held by the holding device (60) and aligned in the insertion direction (R).

10. Electronic assembly according to claim 9, characterized in that a locking element (64) is formed on the first retaining part (61) and / or on the second retaining part (62), which projects into the space (63), wherein a locking opening (35) complementary to the locking element (64) is formed on the connection area (31) of the flexible printed circuit board (30), in which the locking element (64) can be locked into place.

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