Electric plug connector arrangement

Abstract

The invention relates to an electric circuit board plug connector having at least one electric contact element which is at least partially enclosed by a plug housing of the circuit board plug connector, wherein the circuit board plug connector has at least one connection element for electrically and mechanically connecting the circuit board plug connector to a power circuit board, wherein the connection element is designed as a cooling element for dissipating heat from the circuit board plug connector.

Description

[0001] Electrical connector arrangement

[0002] The present invention relates to an electrical circuit board connector with at least one electrical contact element, which is at least partially surrounded by a connector housing of the circuit board connector. The circuit board connector has at least one connecting element for electrically and mechanically connecting the circuit board connector to a power board.

[0003] Such board-to-board connectors are known from EP 2 610 974 B1. EP 2 893 596 B1 shows an electrical connector assembly having a first and a second engagement portion, wherein at least one first vent hole is formed in the first engagement portion to dissipate heat from the first engagement portion, and at least one second vent hole is formed in the second engagement portion to dissipate heat from the second engagement portion.

[0004] The object of the present invention is to provide an electrical circuit board connector that provides the basis for transmitting high currents. It is also an object of the present invention to provide a circuit board assembly comprising a power board with a heat sink and an electrical circuit board connector.

[0005] With regard to the printed circuit board connector, the problem is solved in that the connecting element is designed as a cooling element for dissipating heat from the printed circuit board connector. With regard to the printed circuit board arrangement, the problem is solved in that the connecting element of the printed circuit board connector is arranged adjacent to the heat sink, so that a cooling air flow passing through the heat sink also reaches the connecting element provided as a cooling element. Advantageously, the connecting element or several connecting elements can form a cooling area located between the electrical connection to a power board (which can be realized, for example, via fastening eyes) and the electrical contact area (defined by one or more contact elements).

[0006] The circuit board assembly is preferably part of a machine tool that is supplied with electrical energy by accumulators. The invention incorporates the realization that accumulators—and accordingly, machine tools powered by accumulators—are becoming increasingly more powerful. Due to the high electrical power, the current (or currents) that must be transmitted, for example, via a circuit board connector, is also becoming increasingly larger.

[0007] However, the current-carrying capacity of such connectors is typically limited. If the current to be transmitted is too high, the connector can fail due to overheating. In typical connectors, small metal segments are pressed against a terminal lug by spring force to keep the electrical contact resistance as low as possible. If the connector is subjected to too much current, it heats up excessively. As the metal parts heat up, the spring force decreases, and the contact resistance and thus the heating increase even further. This is a self-reinforcing process that can lead to connector failure.

[0008] Because the connecting element of the board connector is designed as a cooling element to dissipate heat from the board connector, heating of the connector can be reduced and thus the current carrying capacity can be increased.

[0009] In a particularly preferred embodiment, the connecting element has a preferably flat cooling surface with a width defined in the insertion direction of the connector housing and a length defined perpendicular to the insertion direction of the connector housing. It has proven advantageous if the length is at least twice the width. The length of the connecting element outside the connector housing is preferably at least 2 centimeters. In a particularly preferred embodiment, the electrical contact element is designed as a plug-in lug.

[0010] It has proven advantageous if the connecting element is located at least partially outside the connector housing. This allows for a spatial separation of cooling (one or more cooling surfaces) and electrical contact (one or more electrical contact elements).

[0011] In a further preferred embodiment, the electrical contact element and the connecting element are formed integrally with one another, wherein the portion of the connecting element is preferably located completely outside the plug housing and / or the portion of the connecting element is located completely within a volume of the plug housing. It has proven advantageous if the

[0012] The contact element and / or the connecting element are made of metal. It has also proven advantageous if the electrical contact element is electrically and / or thermally coupled to the connecting element, for example, by forming a common sheet metal part.

[0013] In a particularly preferred embodiment, a fastening eyelet is formed on the connecting element, on a side facing away from the contact element. The connecting element can advantageously be screwed to a power board via such an eyelet. Alternatively or additionally, the connection of the connecting element to the power board can be realized via a solder lug or the like.

[0014] In a further preferred embodiment, the printed circuit board connector has a plurality of connecting elements, preferably exactly three connecting elements. It has proven advantageous if the printed circuit board connector has a plurality of contact elements, preferably exactly six contact elements. It has also proven advantageous if two electrical contact elements are provided per connecting element. Particularly preferably, two electrical contact elements are formed integrally with the connecting element.

[0015] In a further preferred embodiment, the contact element and / or the connecting element are partially embedded in the connector housing, for example, by means of plastic injection molding. It has proven advantageous if the connector housing is made of plastic or comprises plastic.

[0016] Preferred embodiments of the circuit board arrangement according to the invention are described below.

[0017] It has proven advantageous if the heat sink of the power board has a cooling fin that extends substantially parallel to the connecting element, preferably to a cooling surface formed on the connecting element. In a further preferred embodiment, the connecting element is aligned with the cooling fin of the heat sink, particularly with respect to its width. It has proven advantageous if multiple cooling fins and multiple connecting elements are provided, with each connecting element preferably being aligned with a respective cooling fin.

[0018] In a further preferred embodiment, the circuit board assembly has a preferably tunnel-shaped air guide element. It has proven advantageous if the air guide element partially encloses the heat sink and / or the connecting element, preferably on three sides. By means of the connecting element, a cooling air flow can be directed along the heat sink and / or the connecting element in a targeted manner, thus improving heat dissipation.

[0019] It has also proven advantageous if the heat sink is forced ventilated. This can be achieved by a fan, for example, one already present in a machine tool.

[0020] In a particularly preferred embodiment, the connecting element is arranged downstream of the heat sink with respect to the cooling air flow.

[0021] In a further preferred embodiment, the connecting element extends through the air guide element. This allows a cooled area of ​​the connecting elements to be separated from the electrical contact area of ​​the contact elements.

[0022] It has proven advantageous if the circuit board arrangement has a cable connector that is complementary to the circuit board connector, wherein the circuit board connector and the cable connector are encapsulated from the environment when plugged together.

[0023] Further advantages will become apparent from the following description of the figures. Particularly preferred embodiments of the present invention are illustrated in the figures. The figures, the description, and the claims contain numerous features in combination. Those skilled in the art will expediently consider the features individually and combine them into useful further combinations.

[0024] In the figure, identical and similar components are numbered with the same reference numerals. It shows:

[0025] Figure 1 shows a preferred embodiment of a board connector;

[0026] Figure 2 is a partially transparent representation of the circuit board connector of Figure 1;

[0027] Figure 3 shows a preferred embodiment of a circuit board arrangement in a partially sectioned view;

[0028] Figure 4 shows the circuit board arrangement of Figure 3 without a section of the air guide element.

[0029] Examples of implementation:

[0030] A preferred embodiment of an electrical board connector 100 according to the invention is shown in Figure 1.

[0031] The electrical circuit board connector 100 contains six electrical contact elements 1A, 1A', 1B, 1B', 1C, 1C'. Furthermore, the circuit board connector 100 contains a connector housing 10.

[0032] As shown in Figure 1, the six contact elements 1A, 1A', 1B, 1B', 1C, 1C' are surrounded by the connector housing 10. The connector housing 10 protects the six contact elements 1A, 1A', 1B, 1B', 1C, 1C', among other things, from mechanical damage. According to an alternative embodiment, more or fewer than six contact elements can be provided.

[0033] The board connector 100 further comprises three connecting elements 3A, 3B, 3C for electrically and mechanically connecting the board connector 100 to a power board 200 (see Figure 3). For this purpose, the connecting elements 3A, 3B, 3C each have a fastening eyelet 5A, 5B, 5C. The connecting elements 3A, 3B, 3C are located outside the connector housing 10. According to an alternative embodiment, more or fewer than three connecting elements can also be included.

[0034] As can be seen from Figure 1, the connecting elements 3A, 3B, 3C are each designed as a cooling element for dissipating heat from the board connector 100. Each of the connecting elements 3A, 3B, 3C - shown here as an example on the first connecting element 3A - has a flat cooling surface KOF with a width B defined in the insertion direction ER of the connector housing 10 and a length L defined perpendicular to the insertion direction ER of the connector housing 10. The length L is, for example, at least twice the width B. Furthermore, each of the connecting elements 3A, 3B, 3C has a wall thickness S of 2 mm. The wall thickness S can generally be between 1.0 and 2.5 mm.

[0035] The respective cooling surfaces KOF of the connecting elements 3A, 3B, 3C jointly define a cooling area KB, via which heat can be dissipated from the printed circuit board connector 100. In Figures 1 and 2, the connecting elements 3A, 3B, 3C are shown as straight sheet metal webs. According to alternative embodiments, each of the connecting elements 3A, 3B, 3C can also be designed in a wave-shaped or zigzag shape. Furthermore, the connecting elements 3A, 3B, 3C can also be designed irregularly in a side view. The ratio between the length of a connecting element 3A, 3B, 3C and a width of a connecting element 3A, 3B, 3C can be at least 2 to 1.

[0036] In general, each connecting element 3A, 3B, 30 is designed in such a way that an electrical current of 40 A to 250 A can be transmitted.

[0037] In the embodiment shown in Figure 1, the electrical contact elements 1A, 1A', 1B, 1B', 1C, 1C' are designed as plug-in lugs, ie they have a substantially rectangular cross-section.

[0038] Figure 2 shows a partially transparent representation of the board connector 100 of Figure 1.

[0039] As shown in Figure 2, two electrical contact elements 1A, 1A'; 1B, 1B'; 1C, 1C' are provided for each of the three connecting elements 3A, 3B, 3C. The first two electrical contact elements 1A, 1A' are formed integrally with the first connecting element 3A, the second two electrical contact elements 1B, 1B' are formed integrally with the second connecting element 3B, and the third two electrical contact elements 1C, 1C' are formed integrally with the third connecting element 3C.

[0040] Both the electrical contact elements 1A, 1A', 1B, 1B', 1C, 1C' designed as plug-in lugs and the flat connecting elements 3A, 3B, 3C are each embedded in sections in the plug housing 10.

[0041] A preferred embodiment of a circuit board assembly in a partially sectioned view is shown in Figure 3. The circuit board assembly 300 is equipped with a power board 200 having a heat sink 250 and with an electrical circuit board connector 100, which has already been described with reference to Figures 1 and 2.

[0042] As can be seen from Figure 3, the circuit board connector 100 is screw-connected to the power board 200. The three connecting elements 3A, 3B, 3C of the circuit board connector 100 are arranged next to the heat sink 250, so that a cooling air flow KLS passing through the heat sink 250 also reaches the connecting element 3A, 3B, 3C designed as a cooling element. As shown in Figure 3, the heat sink 250 has a plurality of cooling fins 255 that extend essentially parallel to the flat connecting elements 3A, 3B, 3C.

[0043] In the presently illustrated embodiment, the heat sink 250 is forced ventilated by a fan (not shown here) of a battery-operated machine tool, so that the cooling air flow KLS is generated in the direction of the arrow. The three connecting elements 3A, 3B, 3C—and thus the common cooling area KB (see Figure 1)—are arranged downstream of the heat sink 250 with respect to the cooling air flow KLS. The common cooling area KB is sandwiched between the electrical connection to the power board 200 (which is realized via the fastening eyelets already described) and the electrical contacting area (defined by the electrical contact elements 1A, 1A', 1B, 1B', 1C, 1C').

[0044] Finally, Figure 4 shows the circuit board assembly 300 equipped with a tunnel-shaped air guide element 310. The air guide element 310 has a tunnel-shaped shaft 315, through which the cooling air flow can be directed to the heat sink 250 (see the sectional view in Figure 3). Furthermore, it is clearly visible that the three connecting elements 3A, 3B, 3C protrude through the air guide element 310, which is only partially slotted below the connector housing 10. Thus, the cooling area KB is protected from external influences (such as dirt in the form of dust).

[0045] The circuit board assembly 300 has a cable connector 150 complementary to the circuit board connector 100. The circuit board connector 100 and the cable connector 150 are encapsulated from the environment when plugged together (this is also shown in Figure 4). The power board 200 is connected to a battery (not shown here) of a machine tool via the cable connector 150. Figure 3 shows, by way of example, a contact element 2C' complementary to the contact element 1C', via which an electrical connection is realized.

[0046] List of reference symbols

[0047] 1A to 1C' contact element

[0048] 2C' complementary contact element

[0049] 3A to 3C connecting element

[0050] 5A to 5C fastening eyelet

[0051] 10 connector housings

[0052] 100 PCB connectors

[0053] 150 cable connectors

[0054] 200 power board

[0055] 250 heat sinks

[0056] 255 cooling fin

[0057] 300 board arrangement

[0058] 310 Air guide element

[0059] 315 tunnel-shaped shaft

[0060] B Width of the cooling surface

[0061] ER insertion direction of the connector housing

[0062] KB cooling area

[0063] KOF cooling surface

[0064] KLS cooling air flow

[0065] L Length of the cooling surface

[0066] S Wall thickness of a connecting element

Claims

Patent claims 1. Electrical circuit board connector (100) with at least one electrical contact element (1A) which is at least partially surrounded by a plug housing (10) of the circuit board connector (100), wherein the circuit board connector (100) has at least one connecting element (3A) for electrically and mechanically connecting the circuit board connector (100) to a power board (200), characterized in that the connecting element (3) is designed as a cooling element for dissipating heat from the circuit board connector (100).

2. Board connector (100) according to claim 1, characterized in that the connecting element (3A) has a preferably flat cooling surface (KOF) with a width (B) defined in the insertion direction (ER) of the connector housing (10) and a length (L) defined perpendicular to the insertion direction (ER) of the connector housing (10), wherein the length (L) is at least twice as large as the width (B).

3. Board connector (100) according to claim 1 or 2, characterized in that the electrical contact element (1A) is designed as a plug-in tab.

4. Board connector (100) according to one of the preceding claims, characterized in that the connecting element (3A) is located at least partially outside the connector housing (10).

5. Board connector (100) according to one of the preceding claims, characterized in that the electrical contact element (1A) and the connecting element (3A) are formed integrally with one another, wherein they are preferably made of metal.

6. Board connector (100) according to one of the preceding claims, characterized in that a fastening eyelet (5) is formed on the connecting element (3A), on a side facing away from the contact element (1A).

7. Board connector (100) according to one of the preceding claims, characterized in that a plurality of connecting elements (3A, 3B, 3C) and two electrical contact elements (1A, 1A'; 1B, 1B'; 1C, 1C') are provided for each connecting element.

8. A circuit board arrangement (300) with a power board (200) having a heat sink (250) and with an electrical circuit board connector (100) according to one of the preceding claims, wherein the circuit board connector (100) is connected to the power board (200), and the connecting element (3A) of the circuit board connector (100) is arranged adjacent to the heat sink (250), so that a cooling air flow (KLS) passing through the heat sink (250) also detects the connecting element (3A) designed as a cooling element.

9. Circuit board arrangement (300) according to claim 8, characterized in that the heat sink (250) has a cooling fin (255) which extends substantially parallel to the surface of the connecting element (3A).

10. Circuit board arrangement (300) according to claim 8 or 9, characterized in that the circuit board arrangement (300) has a preferably tunnel-shaped air guide element (310).

11. Circuit board arrangement (300) according to one of claims 8 to 10, characterized in that the heat sink (250) is forced ventilated and the connecting element (3A), with respect to the cooling air flow (KLS), is preferably arranged downstream of the heat sink (250).

12. Circuit board arrangement (300) according to one of claims 8 to 11, characterized in that the connecting element (3A) projects through the air guide element (310).

13. Circuit board arrangement (300) according to one of claims 8 to 12, characterized in that the circuit board arrangement (300) has a cable connector (150) designed to complement the circuit board connector (100), wherein the board connector (100) and the cable connector (150) are encapsulated from the environment when plugged together.

14. A cordless tool having a housing comprising a circuit board assembly (300) according to any one of the preceding claims.

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