Connecting pin for electrically connecting two electrical units

Abstract

The invention relates to a connecting pin (100) for electrically connecting two electrical units (210; 220), wherein the connecting pin (100) extends along an insertion axis (EA) and, viewed along the insertion axis (EA), has at least one first coupling section (110), wherein the first coupling section (110) is formed by a first head element (111) and a c-rail-shaped first recess (112) for receiving and guiding the first head element (111) along a first coupling axis (KA1) extending perpendicular to the insertion axis (EA), wherein the first recess (112) and the first head element (111), viewed along the insertion axis and a second coupling axis (KA2) extending perpendicular to the insertion axis and the first coupling axis (KA1), each have an isosceles trapezoidal shape.wherein the trapezoidal shapes each taper from a first diameter to a second diameter along a contact direction parallel to the insertion axis (EA), such that the first head element (111) in a first setting position in the first recess (112) has a predetermined first clearance along the second coupling axis (KA2) and the first head element (111) is clamped in a first clamping position with the first recess (112), wherein the first head element (111) can be moved from the first setting position to the first clamping position by sliding it along the contact direction.

Description

[0001] The invention relates to a connecting pin for electrically connecting two electrical units, a system with such a connecting pin and the two electrical units, and a vehicle.

[0002] Screws and / or plug connectors can be used to connect two electrical units. The screw or plug connector itself can serve as the electrical connection between the two units. An example of such a necessary connection can be found in the electric motor of a vehicle. The electric motor must be connected to power electronics, which are designed to control the electric motor.

[0003] The power electronics can incorporate a busbar, which, for example, can be flexible and designed as a copper wire braid. However, such a flexible busbar requires more space. On the other hand, a flexible busbar offers the advantage of greater tolerance in its precise placement relative to the connection point of the electric motor. Rigid busbars, compared to flexible ones, can require less space, but their rigidity significantly limits the available tolerance.

[0004] Generally, when connecting two electrical units with predetermined positions relative to each other, it is important to provide a simple and secure electrical connection. Since screws, for example, can only offer very small tolerances, this leads to difficulties in connecting the two units. Furthermore, vibrations and oscillations can occur during vehicle operation, which can further complicate a screw connection.

[0005] CN 202749553 U describes a flexible electrical connecting pin. The pin consists mainly of a movable contact, an outer shell body, a compression spring, and an end contact. The outer shell body is connected to the end contact by a screw thread. The compression spring is located within a cavity formed by connecting the outer shell body and the end contact. One end of the movable contact is located within a cavity formed by connecting the outer shell body and the end contact.

[0006] It is an object of the present invention to provide a connecting pin, a system, and a vehicle that at least improve upon one or more of the aforementioned disadvantages. In particular, it is an object of the present invention to provide tolerance-compensating mobility during the assembly or connection of two electrical units using the connecting pin. Furthermore, it is a particular object of the present invention to provide a connecting pin that can withstand high currents and loads and has a small footprint.

[0007] According to a first aspect, the problem is solved by a connecting pin for electrically connecting two electrical units, wherein the connecting pin extends along an insertion axis and, viewed along the insertion axis, has at least one first coupling section. The connecting pin can extend from a first to a second end section along the insertion axis, with the first coupling section and further coupling sections potentially located between them.

[0008] The first coupling section is formed by a first head element and a c-rail-shaped first recess for receiving and guiding the first head element along a first coupling axis extending perpendicular to the insertion axis.

[0009] The first recess and the first head element, viewed along the insertion axis and a second coupling axis extending perpendicular to the insertion axis and the first coupling axis, each have an isosceles trapezoidal shape. The trapezoidal shapes taper from a first diameter to a second diameter along a contact direction parallel to the insertion axis, such that the first head element, in a first adjustment position in the first recess, has a predetermined first clearance along the second coupling axis and is clamped to the first recess in a first clamping position.

[0010] The first head element can be moved from the first adjustment position to the first clamping position by sliding it along the direction of pressure.

[0011] The predetermined initial clearance along the second coupling axis allows for greater tolerance when connecting the two units using the connecting pin. Furthermore, this enables the use of a rigid busbar, which can save space. Once the two units and the connecting pin are correctly positioned, particularly with the end sections of the connecting pin in contact with the two units, applying a clamping force along the clamping direction moves the first head element into the first clamping position. This clamping action creates physical contact between the first recess and the first head element, ensuring an electrical connection.

[0012] The first and subsequent recesses mentioned can be designed such that, after the corresponding head element is inserted into the recess, movement out of the recess is only possible along the axis along which the head element was inserted. Consequently, the head element can only be inserted into and removed from the recess along the respective coupling axis.

[0013] The first head element, as well as each subsequent head element, can be designed such that the head element has an isosceles trapezoidal section as its end section. This trapezoidal section is connected to a neck section, which has a diameter smaller than the diameter of an opening in the C-rail shape. The first and second diameters can therefore be larger than this neck section diameter, so that the head element can only be moved along its respective coupling axis within the recess, but cannot fall out of the recess or be removed along its insertion axis.

[0014] The trapezoidal shape of the respective recess can be modeled on the trapezoidal shape of the respective head element, but enlarged by a predetermined magnification factor to provide the respective predetermined play, adjustment position as well as clamping position.

[0015] The first recess and the first head element can therefore be designed to be coupled together. A subsequent second recess and a second head element can also be designed to be coupled together.

[0016] The first coupling section allows the connecting pin to be divided into two pin sections, which can be displaced relative to each other along the first coupling axis by moving the first head element along the first coupling axis within the first recess. Due to the predetermined initial clearance, the two pin sections can be displaced relative to each other along the second coupling axis.

[0017] The connecting pin can have a second coupling section further along the insertion axis. This second coupling section can be formed by a second head element and a second, C-shaped recess for receiving and guiding the second head element along the second coupling axis. The second recess and the second head element can each have an isosceles trapezoidal shape when viewed along the insertion and first coupling axis. The trapezoidal shapes can taper from a third diameter to a fourth diameter, either along or against the direction of contact, such that the second head element, in a second adjustment position, has a predetermined second clearance along the first coupling axis in the second recess and is clamped to the second recess in a second clamping position.The second head element can be moved from the second adjustment position to the second clamping position by sliding it along the direction of pressure.

[0018] Based on the first and second coupling sections, the connecting pin can therefore be divided into three pin sections. Due to the arrangement of the second recess and the second head element being rotated 90° around the insertion axis, as well as the predetermined clearance of the first and second sections, a tolerance along the first and second coupling axes can be provided when connecting the two units using the connecting pin. Once a suitable position within the tolerance has been found, the respective clamping positions can be adjusted by applying the contact force to establish an electrical connection.

[0019] The c-rail shape can be modeled after the respective trapezoidal shape.

[0020] The connecting pin can, in addition to or as an alternative to the second coupling section along the insertion axis, have a third coupling section. This third coupling section can be formed by a third head element and a C-shaped third recess for receiving and guiding the second head element along a first alternative axis. The third recess and the third head element can each have an isosceles trapezoidal shape when viewed along the insertion axis and a second alternative axis. The trapezoidal shapes can taper from a fifth diameter to a sixth diameter, either along or against the direction of contact, such that the third head element, in a third adjustment position within the third recess, has a predetermined third clearance along the second alternative axis and is clamped to the third recess in a third clamping position.

[0021] The third head element can be moved from the third adjustment position to the third clamping position by sliding it along or against the direction of pressure. The first and second alternative axes can be arranged perpendicular to each other and within a plane perpendicular to the insertion axis. Furthermore, the first and second alternative axes can be configured by rotating the first and second coupling axes around the insertion axis by a predetermined angle.

[0022] The connecting pin can be electrically conductive. The connecting pin can be made of or comprise an electrically conductive material. The material can be copper.

[0023] In the first and / or second clamping position, an outer surface of the respective head element and an inner surface of the recess receiving the respective head element can be in contact with each other and / or clamped together. Alternatively or additionally, in the first and / or second adjustment position, the outer surface of the respective head element and the inner surface of the recess receiving the respective head element can be at least partially separated from each other by the predetermined clearance.

[0024] The isosceles trapezoidal shape of the first and / or second recess can each have a height along the insertion axis that is greater than the height of the trapezoidal shape of the head element to be received in the respective recess, so that the respective head element can be moved from the setting position to the clamping position along the direction of pressure.

[0025] The first diameter of the first recess can therefore be larger than the first diameter of the first head element. The second diameter of the first recess can therefore be smaller than the second diameter of the second head element. This can apply analogously to the second and third recesses as well as the second and third head elements.

[0026] The first and / or second coupling section can be designed such that the respective head element or recess includes a return unit that can be arranged between the head element and the recess of the respective coupling section and is designed to provide a predetermined counterforce opposite to the contact direction. Similarly, the third coupling section can include a return unit. The return unit can be designed to allow movement from the setting position to the clamping position of the respective coupling section based on a contact force acting along the contact direction, provided the contact force is greater than the counterforce. Consequently, a predetermined force threshold must be overcome to move the head element from the setting position to the clamping position. The return unit can be a clamping pin or a spring unit with a spring.

[0027] By providing the reset unit, it can be ensured that the coupling sections do not unintentionally switch from the setting position to the clamping position when arranging the two units and connecting them with the connecting pin.

[0028] The connecting pin can have a contact point at its first end section for electrical connection to one of the two electrical units. This contact point can be a fork-shaped contact section for receiving an insertion section of the electrical unit, or it can be designed as a circular connector.

[0029] The fork contact section can be a fork contact socket. The fork contact section can be U-shaped. Consequently, the fork contact section can have two opposing and spaced-apart contact surfaces that extend parallel to the insertion axis and the first coupling axis. A flat contact of the unit to be connected can be inserted into the fork contact section and made contact with the contact surfaces. Furthermore, the fork contact section can allow the flat contact to move along the second coupling axis, while movement along the first coupling axis is blocked by the two contact surfaces.

[0030] The connecting pin can extend from a front to a back side along the first coupling axis, with the first recess either being continuous from front to back or closed off at the front or back. In the closed version, insertion of the first head element into the first recess is only possible from either the front or back side. Pushing through or out of the recess can be prevented by the closed version. Furthermore, the insertion depth of the first head element into the first recess can be adjusted and / or predetermined.

[0031] The connecting pin can extend from a first side to a second side along the second coupling axis, with the second recess being continuous from the first side to the second side or being terminated on the first side or the second side.

[0032] The connecting pin can have a cylindrical shape. The cylindrical shape can have sections with at least partially different and / or identical diameters along the insertion axis. Viewed within a plane spanned by the first and second coupling axes, the connecting pin can have a round, oval, or angular shape.

[0033] The connecting pin can further comprise a first securing unit which can be arranged on the connecting pin and, viewed along the insertion axis, is designed to at least partially surround the first coupling section in order to secure the first head element in the first recess.

[0034] Additionally or alternatively, the connecting pin can include a second securing unit which can be arranged on the connecting pin and, viewed along the insertion axis, is designed to at least partially surround the second coupling section in order to secure the second head element in the second recess.

[0035] The first and / or second locking element can be ring-shaped. The first and / or second locking element can be made of or comprise an elastic material. In its resting state, the diameter of the respective ring-shaped locking element can be smaller than the diameter of the associated coupling section. Due to its elastic property, the ring-shaped locking element can be slid and / or positioned onto the associated coupling section after the head element has been inserted into the recess. This stretches the locking element and provides a restoring force. The elastic material can be an elastomer. The elastic material can be rubber.

[0036] The respective c-rail shape can be formed by two opposing L-shaped sections.

[0037] The shape of the first recess and the first head element is trapezoidal within the plane defined by the insertion axis and the second coupling axis. This trapezoidal shape can be continued along the first coupling axis, resulting in a bar-like shape for the first recess and the first head element.

[0038] The shape of the second recess and the second head element is trapezoidal within the plane defined by the insertion axis and the first coupling axis. This trapezoidal shape can be continued along the second coupling axis, resulting in a bar-like shape for the second recess and the second head element.

[0039] The recesses with associated head elements can each be designed and arranged in such a way that, when moving from the respective setting position to the clamping position, a centered and / or central arrangement in the connecting pin can be achieved.

[0040] The task is solved according to a second aspect by a system comprising a first and a second electrical unit and a connecting pin according to the first aspect, wherein the first and second electrical units are connected to each other by the connecting pin.

[0041] The first unit can have a first electrically conductive contact point, and the second unit can have a second electrically conductive contact point. The first and / or second contact point can be a flat contact or a round contact. The first and second contact points can be positioned one above the other along the insertion axis, such that the connecting pin can be arranged between the first and second contact points. By pressing the first and second units together along the pressing direction, the connecting pin, in particular the first and / or second coupling section, can be brought into the clamping position for electrically connecting the first and second units.

[0042] The first electrical unit can be power electronics, and the second electrical unit can be a connection interface for an electric motor. The electric motor can be part of an electric vehicle. The power electronics can include an inverter and / or a busbar. The second electrical unit can include an EMC filter.

[0043] The system can further include at least one spring unit which can be arranged between the first and second units and is designed to provide a restoring force in the opposite direction to the pressure direction.

[0044] The task is solved according to a third aspect by a vehicle comprising a connecting pin according to the first aspect and / or a system according to the second aspect. The vehicle can be electrically powered. The vehicle can include an electric motor.

[0045] Preferred embodiments are explained by way of example with reference to the accompanying figures. These show: Fig. 1 to 3 a first embodiment of a connecting pin for electrically connecting two electrical units in an adjustment position; Fig. 4 to 6 the connecting pin of the first embodiment in a clamping position; Fig. 7 and Fig. 8 a second embodiment of a connecting pin for electrically connecting two electrical units in an adjustment position; Fig. 9 a system with a connecting pin according to the second embodiment, which connects two electrical units; and Fig. 10 a schematic representation of a vehicle with such a system.

[0046] Fig. Figures 1 to 6 show a first embodiment of a connecting pin 100 with a first coupling section 110 and a second coupling section 120. The connecting pin 100 allows two electrical units 210, 220 to be electrically connected to each other (see Figure 1). Fig. 9).

[0047] The connecting pin 100 can have a cylindrical shape and extends along an insertion axis EA such that one cylinder height of the cylindrical shape is parallel to the insertion axis EA. Perpendicular to the insertion axis EA are a first and second coupling axis KA1, KA2, wherein the first and second coupling axes KA1, KA2 are perpendicular to each other.

[0048] The connecting pin 100 extends along the first coupling axis KA1 from a front to a back side and along the second coupling axis KA2 from a first to a second side.

[0049] The first coupling section 110 is formed by a first head element 111 and a C-shaped first recess 112 for receiving and guiding the first head element 111 along the first coupling axis KA1. As shown in the figures, the recess 112 and a subsequently described recess 121 are formed by two opposing L-shaped sections.

[0050] Due to the c-rail shape or the L-shaped sections, the head element 111 can be pushed into the recess 112 along the first coupling axis KA1 and moved along it. However, due to the specified shape of the recess 112, the head element 111 cannot be moved in the Fig. 1 fall downwards out of the recess 112, since the c-rail shape at least partially encompasses and supports the head element 111.

[0051] It is further shown that the first recess 112 and the first head element 111 are each formed by isosceles trapezoidal shapes and taper from a first diameter to a second diameter along a contact direction parallel to the insertion axis EA, such that the first head element 111 in a first setting position in the first recess 112 has a predetermined first clearance along the second coupling axis KA2. The clearance is in the Fig. 2 is exemplified by the double arrow.

[0052] The recess 112 is formed continuously from the front to the back along the first coupling axis KA1, so that the head element 111 can be inserted into the recess 112 from both the front and the back.

[0053] A first return unit 113 is shown, here in the form of a clamping pin. The clamping pin 113 is arranged, at least partially, between the recess 112 and the head element 111 and provides a return force opposite to the contact direction. Furthermore, the clamping pin 113 is shown according to the Fig. 1 is at least partially incorporated into the head element 111. The provision of the return unit 113 prevents the head element 111 from being unintentionally moved into a subsequent first clamping position. Only by applying a predetermined contact force F along the contact direction can the return unit 113 yield and / or deform, thus enabling a change from the setting position to the clamping position.

[0054] The figures further show that the trapezoidal shape of the recess 112, viewed along the direction of pressure, has a greater height than the trapezoidal shape of the head element 111, so that the second diameter of the recess 112 is smaller than the second diameter of the head element 111.

[0055] By applying at least the contact force F, the return unit 113 deforms and the first head element 111 can be moved along the contact direction. Accordingly, the head element 111 can be moved along the contact direction into the recess 112 until the second diameter of the head element 111 corresponds to a diameter of the recess 112 and is wedged and / or jammed there. In this wedged and / or jammed position, the head element 111 has its first clamping position.

[0056] The second coupling section 120 has a second recess 122 and a second head element 121, which are also isosceles trapezoidal. By reflecting the first recess 112 and the first head element 111 across a plane spanned by the first and second coupling axes KA1, KA2, and subsequently rotating them 90° about the insertion axis EA, the second recess 122 and the second head element 121 can be represented.

[0057] The second recess 122 is C-shaped for receiving and guiding the second head element 121 along the second coupling axis KA2. Both the second recess 122 and the second head element 121 are formed as isosceles trapezoidal shapes and taper from a third diameter to a fourth diameter in the opposite direction of contact, such that the second head element 121, in a second adjustment position within the second recess 122, has a predetermined second clearance along the first coupling axis KA1 and is clamped to the second recess 121 in a second clamping position. The second head element 121 can be moved from the second adjustment position to the second clamping position by sliding it in the opposite direction of contact.

[0058] Furthermore, the second coupling section 120 has a second reset unit 123, which also serves the function of preventing an unintentional displacement of the second head element 121 into the second clamping position.

[0059] The adjustment positions are in the Fig. 1 to 3 and the clamping positions in the Fig. 4 to 6 are shown. As in the Fig. As shown in Figure 2, the first head element 111 has the predetermined first clearance along the second coupling axis KA2. This first clearance provides a tolerance along the second coupling axis KA2 for connecting the two units 210, 220. In the first clamping position of the first head element 111, an outer surface of the first head element 111 rests against an inner surface of the first recess 112, see Figure 2. Fig. 5. By providing the second coupling section 120, the second predetermined clearance is provided, thus establishing a tolerance along the first coupling axis KA1. This applies analogously to the second recess 122 and the second head element 121, however, in this case the clearance is provided along the first coupling axis KA1.

[0060] Fig. 7 and Fig. Figure 8 shows a second embodiment of a connecting pin 100 with only the first coupling section 110. However, the invention is not limited to this and the second 120 and / or a third coupling section could also be provided.

[0061] The connecting pin 100 extends along the insertion axis EA from a first end section to a second end section, each of which can be electrically connected to the first and second units 210 and 220, respectively. At least one of the two end sections can be designed in the form of a fork contact section 130, in particular a fork contact bushing. Furthermore, in the Fig. 7 and Fig. 8 the other end section is designed in the form of a round plug.

[0062] The fork-type contact socket 130 is U-shaped and is designed to receive a flat contact of the electrical unit 210, 220 to be connected. Furthermore, the flat contact can be displaced within the fork-type contact socket 130 along the second coupling axis KA2.

[0063] Fig. Figure 9 shows a system 200 with the first unit 210, the second unit 220 and the connecting pin 100 according to the second embodiment.

[0064] As in the Fig. As shown in Figure 9, the first unit 210 has the flat contact which is inserted into the fork contact section 130. The opposite circular connector of the connecting pin 100 is inserted into a corresponding interface of the second unit 220 in order to achieve an electrical connection between the first and second units 210, 220 by means of the connecting pin 100.

[0065] The system 200 can have two or more connecting pins 100 for connecting the first and second units 210, 220.

[0066] The setup shown can be used particularly in electrically powered vehicles 300. In electrically powered vehicles 300, an electrical connection is required between the power electronics for controlling an electric motor and the electric motor itself. The first unit 210 can be the power electronics and the second unit 220 the electric motor.

[0067] Furthermore, in the Fig. Nine spring units 230 are shown, which are part of the system 200. The spring units 230 can provide a restoring force such that the fork contact bushing 130 is pushed away from the first unit, here the flat contact, along the insertion axis EA. Fig. Figure 9 shows the compressed state of the spring units 230.

[0068] Fig. Figure 10 shows a vehicle 300, in particular a vehicle 300 driven by an electric motor or e-motor with such a system 200. Since the installation space in vehicles 300 is limited, the proposed connecting pin 100 can be used to connect the power electronics and the motor, providing a connection that offers increased tolerance for the arrangements of the power electronics and the motor. At the same time, only a small installation space is required for the connecting pin 100. Reference sign 100 connecting pins 110 first coupling section 111 first head element 112 first in-depth study 113 first reset unit 120 second coupling section 121 second head element 122 second in-depth study 123 second reset unit 130 Fork contact section 200 System 210 first electrical unit 220 second electrical unit 230 spring unit EA insertion axis F Contact force KA1 first coupling axis KA2 second coupling axis QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 202749553 U

[0005]

Claims

[1] Connecting pin (100) for electrically connecting two electrical units (210; 220), wherein the connecting pin (100) extends along an insertion axis (EA) and, viewed along the insertion axis (EA), has at least a first coupling section (110), wherein the first coupling section (110) is formed by a first head element (111) and a c-rail-shaped first recess (112) for receiving and guiding the first head element (111) along a first coupling axis (KA1) extending perpendicular to the insertion axis (EA), wherein the first recess (112) and the first head element (111), viewed along the insertion axis and a second coupling axis (KA2) extending perpendicular to the insertion axis and the first coupling axis (KA1), each have an isosceles trapezoidal shape, wherein the trapezoidal shapes each taper from a respective first diameter to a second diameter along a pressure direction parallel to the insertion axis (EA), such that the first head element (111) in a first setting position in the first recess (112) has a predetermined first clearance along the second coupling axis (KA2) and the first head element (111) is clamped in a first clamping position with the first recess (112), wherein the first head element (111) can be moved from the first setting position to the first clamping position by sliding it along the direction of pressure. [2] Connecting pin (100) according to claim 1, wherein the connecting pin (100) further along the insertion axis (EA) has a second coupling section (120), wherein the second coupling section (110) is formed by a second head element (121) and a c-rail-shaped second recess (122) for receiving and guiding the second head element (121) along the second coupling axis (KA2), wherein the second recess (122) and the second head element (121), viewed along the insertion axis and the first coupling axis (KA1), each have an isosceles trapezoidal shape, wherein the trapezoidal shapes taper from a respective third diameter to a fourth diameter along or against the direction of pressure, such that the second head element (121) in a second adjustment position in the second recess (122) has a predetermined second clearance along the first coupling axis (KA1) and the second head element (121) is clamped in a second clamping position with the second recess (122), wherein the second head element (121) can be moved from the second setting position to the second clamping position by sliding it along the direction of pressure. [3] Connecting pin (100) according to claim 1 or 2, wherein in the first and / or second clamping position an outer surface of the respective head element (111; 121) and an inner surface of the recess (112; 122) receiving the respective head element (111; 121) are in contact and / or clamped together, and / or wherein in the first and / or second setting position the outer surface of the respective head element (111; 121) and the inner surface of the recess (112; 122) receiving the respective head element (111; 121) are at least partially separated from each other by the predetermined clearance. [4] Connecting pin (100) according to any one of the preceding claims, wherein, viewed along the direction of pressure, the trapezoidal shape of the first and / or second recess (112; 122) has a height that is greater than the height of the trapezoidal shape of the head element (111; 121) to be received in the respective recess (112; 122), so that the respective head element (111; 121) can be moved from the setting position to the clamping position along the direction of pressure. [5] Connecting pin (100) according to any one of the preceding claims, wherein the first and / or second coupling section (110; 120) is designed such that the respective head element (111; 121) or the respective recess (112; 122) comprises a return unit (130) which can be arranged between the head element (111; 121) and the recess (112; 122) of the respective coupling section (110; 120) and is designed to provide a predetermined counterforce against the direction of contact, wherein the return unit (130) is designed to enable the movement from the setting position to the clamping position of the respective coupling section (110; 120) based on a contact force acting along the contact direction, if the contact force is greater than the counterforce. [6] Connecting pin (100) according to claim 5, wherein the return unit (130) is a clamping pin or a spring unit with a spring. [7] Connecting pin (100) according to any one of the preceding claims, wherein the connecting pin (100) has a contact point at a first end section of the connecting pin (100) for electrical connection to one of the two electrical units, wherein the contact point has a fork contact section (130) for receiving an insertion section of the electrical unit or is designed as a circular plug. [8] Connecting pin (100) according to claim 7 in combination with claim 1, wherein the fork contact section (130) is designed such that it blocks a movement of the insertion section inserted into the fork contact section (130) along the first coupling axis (KA1). [9] Connecting pin (100) according to any one of the preceding claims, wherein the connecting pin (100) extends from a front to a back side along the first coupling axis (KA1), wherein the first depression (112) is formed continuously from the front to the back or is closed off on the front or back. [10] Connecting pin (100) according to any one of the preceding claims, wherein the connecting pin (100) extends from a first side to a second side along the second coupling axis (KA2), wherein the second depression (122) extends continuously from the first side to the second side or is closed off on the first side or the second side. [11] Connecting pin (100) according to any one of the preceding claims, further comprising: a first securing unit which can be arranged on the connecting pin (100) and, viewed along the insertion axis (EA), is designed to at least partially surround the first coupling section (110) in order to secure the first head element (111) in the first recess (112), and / or a second securing unit which can be arranged on the connecting pin (100) and, viewed along the insertion axis (EA), is designed to at least partially surround the second coupling section (120) in order to secure the second head element (121) in the second recess (122). [12] System (200) comprising a first and a second electrical unit (210; 220) and a connecting pin (100) according to any one of claims 1 to 11, wherein the first and second electrical units (210; 220) are connected to each other by the connecting pin (100). [13] System (200) according to claim 12, wherein the first unit (210) has a first electrically conductive contact point and the second unit has a second electrically conductive contact point, wherein the first and second contact points can be positioned one above the other along the insertion axis (EA) such that the connecting pin (100) can be arranged between the first and second contact points, wherein by pressing the first and second units (210; 200) along the pressing direction the connecting pin (100) can be brought into the clamping position for electrically connecting the first and second units (210; 220). [14] System (200) according to claim 12 or 13, wherein the first electrical unit (210) is a power electronics unit and the second electrical unit (220) is a connection interface of an electric motor. [15] Vehicle (300) comprising a connecting pin (100) according to any one of claims 1 to 11 and / or a system (200) according to any one of claims 12 to 14.

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