Electrical device with a printed circuit board

Abstract

Electrical device, wherein a printed circuit board of the electrical device has openings, wherein respective busbars each project at least into one of the openings, in particular with clearance.

Description

[0001] Electrical device with a circuit board

[0002] Description:

[0003] The invention relates to an electrical device with a printed circuit board.

[0004] It is generally known that a printed circuit board can be manufactured in a single layer or in multiple layers with conductive traces.

[0005] From DE 102010041 369 A1, a wiring element is known as the closest prior art.

[0006] A circuit assembly is known from DE 11 2015000733 T5.

[0007] From DE 102009046870 A1 an electronic switching device with connecting cable is known.

[0008] The invention is therefore based on the objective of further developing an electrical device with a printed circuit board, whereby strong currents should be able to pass through it.

[0009] According to the invention, the problem is solved in the electrical device by means of a printed circuit board.

[0010] solved according to the features specified in claim 1.

[0011] Important features of the invention in the electrical device are that a circuit board of the electrical device has recesses, in particular through recesses,

[0012] wherein each busbar protrudes at least into each of the recesses, in particular with play, especially in directions parallel to the plane of the circuit board.

[0013] An advantage of this is that high currents can be conducted even though the conductivity of the circuit board's traces is much lower than that of the busbars. Thus, a much higher current can be conducted using the hybrid circuit board formed from the busbars and the circuit board, especially with a cover and an intermediate section, than through the traces of the hybrid circuit board alone. However, the

[0014] ISI \ EIDOPAT 20.10.2025 The busbars are arranged with only play in the recesses of the printed circuit board (PCB) and are therefore movable in three spatial directions. The movement of each busbar within its recess is dampened only by a wire connected to a conductor track on the PCB. Specifically, the wire connects the busbar to the PCB and is elastic enough to allow movement in all dimensions until it reaches a stop against one of the surrounding plates, with the freedom of movement being in the range of well under one millimeter. Furthermore, the production of the hybrid PCB is very simple, as only the PCB and PCB-like components, as well as the busbars, are required. When high currents are carried through, thermal expansion of the busbars occurs, but this expansion can be compensated for within the play.The potential of the busbar of an electronic circuit, whose electronic components are mounted on the circuit board, can be determined using the wire.

[0015] In an advantageous embodiment, an intermediate part is placed on the circuit board, on which a cover part is placed on the side of the cover part facing away from the intermediate part.

[0016] The respective busbar is positively and / or securely held within the stack formed by the cover, the intermediate part, and the printed circuit board (PCB). An advantage of this design is that a stack of PCBs can be formed in which recesses for the positively engaged busbars can be provided. The PCBs have a varying number of layers of conductive traces, either zero or a natural number. The intermediate part and the cover are therefore each manufactured solely from the PCB material and contain no metallic conductive traces. The PCB, however, is at least single-layered, allowing it to be populated with electronic components that form an electronic circuit for detecting the potential of a given busbar or for detecting a voltage.The intermediate part serves to limit the connection sections and the cover part to improve electrical insulation.

[0017] In an advantageous embodiment, the intermediate part has further recesses into which the connecting sections of the busbars project. It is advantageous that, particularly in all directions parallel to the printed circuit board plane, not only are the tab areas positively secured by the printed circuit board, but also the connecting areas by means of the intermediate part. In an advantageous embodiment, the stack is held together by means of fastening elements, in particular rivets or screws, which extend through the printed circuit board, the intermediate part, and the cover part, and / or by adhesive.

[0018] and / or that the respective busbar is arranged with play in all spatial directions within the area bounded by the circuit board, the intermediate part, and the cover part, particularly when the wire is detached from the busbar. It is advantageous that the intermediate part, the cover part, and the circuit board can be easily connected to one another and that the busbars are not rigidly connected but are bounded with play by a form-fitting connection, in particular where elastic retention is achieved by means of the wire.

[0019] In an advantageous embodiment, the intermediate part is designed in the shape of a plate, in particular a printed circuit board,

[0020] In particular, the geometric external dimensions of the intermediate part deviate by less than ten percent from the geometric external dimensions of the printed circuit board. An advantage of this is that no additional effort is required to manufacture the intermediate part; it is simply made from electrically insulating printed circuit board material.

[0021] In an advantageous embodiment, the cover part is plate-shaped, in particular printed circuit board-shaped, and especially wherein the geometric outer dimensions of the cover part deviate by less than ten percent from the geometric outer dimensions of the printed circuit board. An advantage of this is that no additional effort is required to manufacture the cover part; it is simply made from electrically insulating printed circuit board material.

[0022] In an advantageous embodiment, the respective tab areas of each busbar project into respective recesses, and a connection area of ​​each busbar, particularly one-piece, rests on the circuit board on the side of the circuit board facing the intermediate section. It is advantageous that the connection area does not project into the circuit board but rests against it. In an advantageous embodiment, a wire soldered to a metallic conductor track of the circuit board is positively connected to the respective connection area. It is advantageous that the potential of the busbar can be detected. For this purpose, an electronic circuit can be used whose electronic components are mounted on the circuit board, achieving high insulation resistance with respect to the busbars.Furthermore, it is advantageous that the potential of the busbar can be detected and / or transmitted to other circuit boards, preferably with electrical components mounted on the circuit board for this purpose.

[0023] In an advantageous embodiment, each tab area has a through hole, in particular a through hole.

[0024] In particular, the cover part and the intermediate part have recesses shaped such that the cover part and the intermediate part do not cover the through holes of the tab areas. An advantage of this is that an electrical connection from the surroundings is easily made possible.

[0025] In an advantageous embodiment, the wire is inserted into a hole in the connection area and held in place by frictional locking.

[0026] In particular, the material of the connection area is plastically deformed in the region of the hole's edge. An advantage of this is that, although the current-carrying capacity of the circuit board's conductors is lower than that of the busbars, the potential can be detected.

[0027] In a preferred embodiment, the wire is pressed into a marginal slot of the connection area. An advantage of this is that torsional or tensile stress relief is achieved.

[0028] In a preferred embodiment, the wire is a tinned copper wire. The advantage here is that a cost-effective wire can be used, which can be easily soldered to a conductor track on the circuit board.

[0029] In a preferred embodiment, the respective busbar is made of copper or aluminum. The advantage here is that high current-carrying capacity can be achieved with a small footprint. Aluminum, however, is more cost-effective and can be connected to a copper wire while maintaining the lowest possible contact resistance. In a preferred embodiment, cells, particularly energy storage cells, especially capacitors, double-layer capacitors, batteries, or accumulators, are electrically interconnected via the circuit board and busbars. The advantage here is that the high charging and discharging currents can be conducted even though the conductor tracks of the circuit board have a significantly lower current-carrying capacity.

[0030] In an advantageous embodiment, the intermediate part and / or the cover part is made of printed circuit board material, in particular epoxy resin and / or FR4. An advantage of this is that high electrical insulation strength can be achieved.

[0031] Further advantages arise from the dependent claims. The invention is not limited to the combination of features in the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent, particularly from the problem statement and / or the problem arising from a comparison with the prior art. The invention will now be explained in more detail with reference to schematic illustrations.

[0032] Figure 1 shows an exploded hybrid circuit board of an electrical device, which has a circuit board 1 with busbars 3.

[0033] Figure 2 shows a power rail 3 in oblique view.

[0034] Figure 3 shows the connection of one of the busbars 3 with a circuit board of the hybrid circuit board.

[0035] Figure 4 shows the hybrid circuit board in an oblique view.

[0036] Figure 5 shows the hybrid circuit board covered with cover parts 50.

[0037] Figure 6 shows the electrical device, in particular an energy storage device, in exploded condition.

[0038] Figure 7 shows the top side of the hybrid circuit board exploded, so that the intermediate part 70 between the cover part 50 and the circuit board 1 is also shown.

[0039] As shown in Figure 1, the circuit board 1 has through-holes 2.

[0040] As shown in the figures, each busbar 3 has a connection area 21 which is connected to tab areas 22, wherein the busbar 3 together with the connection area 21 and the tab areas 22 is made in one piece, in particular as a stamped-bent part.

[0041] The tab areas 22 are thus connected to each other via the respective connection area 21. The busbar 3, each consisting of a connection area and the tab areas 22, is inserted into the recesses 2 with its tab areas 22, while the respective connection area 21 rests on the circuit board 1.

[0042] Each of the tab areas 21 has a through-hole so that a contact pin can be passed through the through-hole. The tab areas 21 project into the recesses 2, in particular so that the connection area 21 adjoins the area covered by the printed circuit board 1 in the normal direction of the printed circuit board plane and the area covered by the respective tab area 21 in the normal direction overlaps with the area covered by the printed circuit board 1 in the normal direction of the printed circuit board plane.

[0043] The busbars 3 are made of metal, such as copper or aluminum.

[0044] A hole is arranged in the connection area 21, into which a wire 20 is inserted at the beginning of production. The wire's diameter is smaller than the clear diameter of the hole. By pressing with a punch tool in the area around the hole, the wire is positively connected. This is because the pressure from the punch tool causes plastic deformation of the material of the busbar 3, thus reducing the clear diameter of the hole. The plastically deformed material of the busbar 3 is then pressed against the wire 20. The portion of the wire 20 protruding from the hole is bent over and pressed into a slot at the edge of the busbar 3, thereby relieving strain on the wire 20 and preventing twisting or rotation.

[0045] The wire 20 is soldered to a conductor track of the circuit board, particularly at its end facing away from the hole, so that an electrical connection is established between the busbar 3 and the conductor track of the circuit board. Thus, the wire 20 provides not only an electrical but also a mechanical connection.

[0046] As shown in Figure 7, one side of the circuit board 1 is covered with a cover plate 50, with an intermediate part 70 positioned between the cover plate 50 and the circuit board 1, which limits the busbars 3. For this purpose, the intermediate part 70 has recesses 2 into which the respective busbar 3, in particular the respective connecting part 21, projects. The intermediate part 70 limits the busbars 3, thus preventing overloading of the wire connection. Furthermore, the intermediate part 70 serves as a support for the cover plate 50 and dissipates the contact forces exerted by it.

[0047] The circuit board 1 can also be populated with electronic components, so that the intermediate part 70 also has recesses for these components if these components are mounted on the side of the circuit board 1 on which the intermediate part 70 and the cover part 50 are also located. Alternatively, the components can also be mounted on the side of the circuit board 1 facing away from the cover part 50.

[0048] The cover plate 50 and / or the intermediate part 70 are preferably made of a printed circuit board material, such as epoxy resin and / or FR4, in particular without intermediate metallic layers.

[0049] In this embodiment, it is important that each busbar 3 is positively locked within the circuit board 1, the intermediate part 70, and the cover part 50, and is arranged with some play. This provides sufficient free space to compensate for thermally induced expansion of the respective busbars due to high currents. The wire 20 provides the electrical connection to a metallic layer of the circuit board, thus enabling, for example, the detection of the potential of each busbar 3.

[0050] However, the current-carrying capacity of wire 20 is at least one hundred times smaller than the current-carrying capacity.

[0051] Corresponding to the busbars 3, connecting busbars 4, in particular connecting lugs, are also positively locked between the circuit board 1, the intermediate part 70 and the cover part 50 and are arranged with play. The connecting busbars 4 also have a tab area that is recessed into a recess in the circuit board 1, and a connection area 21 that rests on the circuit board 1.

[0052] Furthermore, the end area of ​​the connecting busbar 4 facing away from the tab area of ​​the respective connecting busbar 4 protrudes from the circuit board 1 and is angled in such a way that the protruding area of ​​the connecting busbar 4, in particular the area of ​​the connecting busbar 4 that protrudes beyond the edge of the circuit board 1, extends parallel to the normal direction of the circuit board plane.

[0053] Thus, the connecting busbars offer 4 connection options for further busbar connections and therefore the possibility of connecting supply lines.

[0054] A tinned copper wire is preferably suitable as wire 20.

[0055] The cover part 50, the intermediate part 70, and the circuit board 1 are preferably held together by rivets and / or screws or by adhesive. The parts to be electrically connected to the busbars 3 may also be welded to the busbars 3.

[0056] In the operation of power rail 3, changes in length and tolerances can be compensated for.

[0057] In the normal direction to the plane of printed circuit board 1, neglecting the clearance of the busbar 3, the area covered by the cover part 50 borders the area covered by the respective busbar 3, which overlaps with the area covered by the intermediate part 70. The area covered by the busbar 3 in the normal direction to the plane of printed circuit board 1 also overlaps with the area covered by printed circuit board 1 in the normal direction to the plane of printed circuit board 1.

[0058] The printed circuit board plane is aligned parallel to the side surface of the printed circuit board that faces the intermediate part and / or the cover part.

[0059] As shown in Figure 6, the hybrid circuit board can be used in an energy storage device that functions as an electrical appliance. The hybrid circuit board contacts and connects terminals of cells 60, in particular energy storage cells. For example, the cells 60 are capacitors, batteries, or accumulators.

[0060] As shown in Figure 6, each cell has two terminals located on opposite sides of the cell. A hybrid circuit board is arranged on each side to connect the terminals of the cells 60 on that side. In this way, the cells 60 are electrically connected in parallel or in series.

[0061] Preferably, a welded connection between the respective terminal of each cell 60 and each busbar 3 is even possible. The respective wire 20, which is crimped and positively connected to the respective busbar 3, provides a damping connection function within the play of the busbar 3 and establishes the electrical connection. The voltage provided by the capacitor module is made available at the connection busbars 4, in particular connection lugs, of one of the two hybrid circuit boards.

[0062] Mechanically, the cells 60 are received and held in a frame 61.

[0063] Preferably, the hybrid circuit boards are also connected to the frame 61.

[0064] In further embodiments according to the invention, a plastic is used as the material for the intermediate part 70 and the cover part 50, wherein the two parts (50, 70) can be manufactured as plastic injection molded parts.

[0065] The printed circuit board 1 is preferably designed as a single layer. In further embodiments according to the invention, the printed circuit board 1 is not designed as a single layer, but as a multi-layer board. List of reference numerals

[0066] 1 circuit board

[0067] 2 Exclusion

[0068] 3 Power rail

[0069] 4 Connection busbar, in particular connection lug 20 wire

[0070] 21 Connection area

[0071] 22 tab area

[0072] 30 solder joints

[0073] 50 Cover part

[0074] 60 cells, especially energy storage cells

[0075] 61 Frame

[0076] 70 Intermediate part

Claims

Patent claims:

1. Electrical appliance, wherein a circuit board of the electrical device has cutouts, in particular through cutouts, characterized by the fact that into each of the recesses a respective busbar protrudes at least into, in particular with play, especially in directions parallel to the plane of the circuit board.

2. Electrical appliance according to claim 1, characterized by the fact that an intermediate part is placed on the circuit board, on which a cover part is placed on the side of the cover part facing away from the intermediate part, wherein the respective busbar is received and / or held in the stack formed from the cover part, the intermediate part and the circuit board in a form-fitting manner with play.

3. Electrical appliance according to any of the preceding claims, characterized by the fact that The intermediate part has further recesses into which the connecting sections of the conductor rails protrude.

4. Electrical appliance according to any of the preceding claims, characterized by the fact that the stack is held together by means of fasteners, in particular rivets or screws, which pass through the circuit board, the intermediate part and the cover part, or by gluing, and / or that the respective busbar is arranged with play in all spatial directions in the area limited by the circuit board, the intermediate part and the cover part, especially when the wire is away from the busbar.

5. Electrical appliance according to any of the preceding claims, characterized by the fact that the intermediate part is designed in a plate-like form, in particular in the form of a printed circuit board, in particular where the geometric outer dimensions of the intermediate part deviate by less than ten percent from the geometric outer dimensions of the printed circuit board. - 14- 6. Electrical appliance according to any of the preceding claims, characterized by the fact that the cover part is designed in a plate-like form, in particular in a printed circuit board-like form, in particular wherein the geometric outer dimensions of the cover part deviate less than ten percent from the geometric outer dimensions of the printed circuit board.

7. Electrical appliance according to any of the preceding claims, characterized by the fact that The respective tab areas of the respective busbar protrude into the respective recesses and a connection area of ​​the respective busbar, connected to the tab areas and in particular designed in one piece, rests on the circuit board on the side of the circuit board facing the intermediate part.

8. Electrical appliance according to any of the preceding claims, characterized by the fact that Each wire, soldered to a metallic conductor track of the circuit board, is positively connected to the respective connection area.

9. Electrical appliance according to any of the preceding claims, characterized by the fact that the respective tab area has a through hole, in particular a through hole, in particular wherein the cover part and the intermediate part have recesses shaped in such a way that the cover part and the intermediate part do not cover the through holes of the tab areas.

10. Electrical appliance according to any of the preceding claims, characterized by the fact that the wire is inserted into a hole in the connection area and is held securely, in particular by the material of the connection area being plastically deformed in the area of ​​the edge of the hole. - 15- 11. Electrical appliance according to any of the preceding claims, characterized by the fact that the wire is pressed into a slot at the edge of the connection area.

12. Electrical appliance according to any of the preceding claims, characterized by the fact that the wire is a tinned copper wire.

13. Electrical appliance according to any of the preceding claims, characterized by the fact that The respective busbar is made of aluminum or copper.

14. Electrical appliance according to any of the preceding claims, characterized by the fact that Cells, in particular energy storage cells, especially capacitors, double-layer capacitors, batteries or accumulators, are electrically interconnected by means of the circuit board including busbar.

15. Electrical appliance according to any of the preceding claims, characterized by the fact that the intermediate part and / or the cover part is made of printed circuit board material, in particular epoxy resin and / or FR4.

Images