High current contact device and connection device for transmitting electrical energy in a motor vehicle

Abstract

The invention relates to a high-current contact device (25) and a connection device (15) comprising the high-current contact device (25), wherein the high-current contact device (25) comprises a contact element (45, 65), a contact housing (40) and a temperature measuring device (50, 70), wherein the contact housing (35) has a contact receiver (190) for receiving the contact element (45, 65), wherein the contact element (45, 65) can be at least partially inserted into another high-current contact device (45, 65) along an insertion axis (110). 30), wherein the contact housing (35) has a sensor receiver (205) which is inclined relative to the insertion axis (110), wherein the sensor receiver (205) leads to the contact receiver (190), wherein a temperature measuring device (50, 70) is at least partially arranged in the sensor receiver (205), wherein the temperature measuring device (50, 70) abuts against an outer circumferential side (130) of the contact element (45, 65) for measuring a temperature (T S1 (t),T S2 (t)).

Description

Technical Field

[0001] The invention relates to a high-current contact arrangement according to claim 1 and to a connection arrangement according to claim 13 for transmitting electrical energy, in particular drive energy, in a motor vehicle. Background Art

[0002] A plug-in device with temperature sensing is known from DE 10 2016 107 401 A1. Summary of the invention

[0003] The object of the present invention is to provide an improved high-current contact arrangement and an improved connection device for transmitting electrical energy, in particular electrical drive energy, in a motor vehicle.

[0004] This object is achieved by a high-current contact arrangement according to claim 1 and a connecting arrangement according to claim 13. Advantageous embodiments are specified in the dependent claims.

[0005] It has been recognized that an improved high current contact device can be provided by a high current contact device comprising a contact element, a contact housing and a temperature measuring device. The contact housing has a contact receiver for receiving the contact element. The contact element can be at least partially inserted into another contact element of another high current contact device along an insertion axis. The contact housing has a sensor receiver inclined relative to the insertion axis. The sensor receiver leads to the contact receiver. The temperature measuring device is at least partially arranged on the sensor receiver. The temperature measuring device is against the outer circumferential side of the contact element for measuring the temperature of the contact element.

[0006] The advantage of this design is that, since the temperature measuring device is integrated into the contact housing and the sensor receiver is tilted relative to the insertion axis, the temperature measuring device can be mounted in a particularly simple and cost-effective manner. If necessary, the temperature measuring device can also be replaced in the event of damage without having to disassemble the high-current contact device. In addition, due to the direct contact of the temperature measuring device with the contact element, the temperature of the contact element can be measured in a particularly precise manner. As a result, overheating of the contact element can be detected at an early stage and, if necessary, the current transmitted via the high-current contact device can be reduced accordingly.

[0007] In another embodiment, the temperature measuring device comprises a temperature sensor and a sensor housing, wherein the temperature sensor is embedded in the sensor housing. The sensor housing bears against the contact element and thermally couples the temperature sensor to the contact element. The temperature sensor is designed to measure the temperature of the contact element. Embedding the temperature sensor in the sensor housing has the advantage that the temperature sensor is protected from moisture. In particular, situations in which leakage currents caused by moisture falsify the measurement of the temperature sensor can be avoided.

[0008] In another embodiment, the temperature measuring device has a connecting cable. The connecting cable has a first cable sheath and at least one electrically insulating and electrically conductive sensor wire passing through the first cable sheath. The connecting cable is led to the temperature sensor and the sensor wire is electrically connected to the temperature sensor. The sensor housing is connected to the first cable sheath in a material-bonded manner. The connecting cable in a subsection embedded in the sensor housing is led to the temperature sensor. Due to the material-bonded connection between the sensor housing and the first cable sheath, it is ensured that the temperature measuring device is highly durable and the above-mentioned moisture penetration is prevented in a continuous manner during the life of the temperature measuring device.

[0009] In this case, it is particularly advantageous if the sensor housing and the first cable sheath comprise essentially the same matrix material. Additionally or alternatively, the sensor housing and / or the first cable sheath comprise at least one of the following matrix materials: silicone, polyethylene, polyurethane, and it is also particularly advantageous if at least one of the following fillers is embedded in the matrix material of the sensor housing: copper, aluminum, silver. This makes the sensor housing particularly thermally conductive.

[0010] A particularly precise and rapid measurement of the temperature of the contact element is ensured if the thermal conductivity of the sensor housing is between 1 W / (m×K) and 2 W / (m×K) inclusive.

[0011] In another embodiment, the contact element has an insertion region and a connection region connected to the insertion region. The connection region has a connection receptacle internally for receiving and electrically contacting an electrical conductor of a high-current cable. The insertion region is designed to achieve electrical contact with another contact element. On the outer circumferential side of the connection region, a temperature measuring device abuts against the contact element. Measuring the temperature of the connection region, in particular if the connection region is crimped, enables particularly accurate indirect measurement of the temperature of the contact element, in particular also in the insertion region. In this case, it is particularly advantageous if the contact element is thermally conductive.

[0012] The contact housing has a collar portion. The collar portion delimits the sensor receiver internally. The sensor housing abuts against the inner circumferential side of the collar portion. This prevents the temperature measuring device from tilting in the sensor receiver.

[0013] It is particularly advantageous if the sensor housing has a circumferential sealing profile implemented around the circumference of the sensor housing. The sealing profile bears against the inner circumferential side of the collar portion and seals the contact receiver against the ingress of liquid via the sensor receiver. This prevents corrosion of the contact elements in the contact receiver.

[0014] In another embodiment, the high-current contact device has a sensor cover arranged on the outside of the contact housing. The sensor cover at least partially closes the outside of the sensor receiver. The inside of the sensor cover abuts against the temperature measuring device on the side facing away from the contact element. The sensor cover ensures physical contact between the temperature measuring device and the contact element. Reliable temperature measurement by the temperature measuring device is thereby ensured.

[0015] It is particularly advantageous if the sensor housing is arranged in a tensioned manner in the sensor receiver and the bearing contact surface of the temperature measuring device is pressed against the outer circumference of the contact element with a pressing force. The thermal resistance between the outer circumference of the contact element and the temperature measuring device is therefore particularly low.

[0016] It is particularly advantageous if the sensor cover has a lead-in to the sensor receiver, wherein the connecting cable is led out of the sensor receiver via the lead-in. This design has the advantage that the connecting cable is prevented from getting stuck when it is led out to the housing. In addition, the sensor cover can reliably introduce a pressing force into the sensor housing without damaging the connecting cable.

[0017] In another embodiment, the sensor cover has a circumferential edge. The edge is arranged outside the collar portion and is forcibly connected to the collar portion.

[0018] A connection device for transmitting electrical energy, in particular drive energy, in a motor vehicle can be provided, wherein the connection device has a high-current contact device and a high-current cable, wherein the high-current contact device is implemented as described above. The high-current cable comprises an electrical conductor and a second cable sheath enclosing the electrical conductor. The electrical conductor is designed to transmit electrical energy. The electrical conductor is electrically connected to the contact element.

[0019] The advantage of this design is that, due to the temperature measuring device, in particular in the region where the electrical conductor of the high-current cable is coupled to the contact element, a particularly precise measurement of the temperature of the contact element is ensured. Since the temperature measuring device is inserted on one side, the connecting cable of the temperature measuring device can be guided independently of the route of the high-current cable. Furthermore, the temperature measuring device can be replaced, in particular in the event of damage, without having to remove the contact element and the high-current cable from the contact housing. The connecting device is therefore particularly easy to repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be explained in more detail below with reference to the accompanying drawings. It is shown in the drawings:

[0021] Figure 1 is an exploded view of the system with the connecting devices;

[0022] Figure 2 yes Figure 1 A partial perspective view of a temperature measuring device of the first high current contact device shown;

[0023] Figure 3 It is along Figure 1 The section AA shown passes through Figure 1 A detail of a cross-sectional view of the first high current contact arrangement is shown;

[0024] Figure 4 It passes through Figure 1 The system shown follows Figure 1 A cross-sectional view of section AA is shown. DETAILED DESCRIPTION

[0025] In the following figure, reference is made to a coordinate system. The coordinate system is exemplarily implemented as a right-handed coordinate system and has an x-axis (longitudinal direction), a y-axis (lateral direction) and a z-axis (vertical direction).

[0026] Figure 1 An exploded view of a system 10 is shown comprising a connection device 15. The connection device 15 has at least one high-current cable 20 and a first high-current contact device 25. The system 10 also has a second high-current contact device 30.

[0027] In this embodiment, the first high current contact device 25 and the second high current contact device 30 are implemented as multi-pole contact devices. Figure 1 In contrast to the multi-pole design shown, especially with Figure 1 In contrast to the bipolar design shown, the first high current contact device 25 and the second high current contact device 30 can also be unipolar. For reasons of simplicity, the first high current contact device 25 and the second high current contact device 30 are described below in conjunction with a bipolar design, with a detailed description based on one of the poles of the high current contact devices 25, 30.

[0028] The system 10 is used to transmit driving energy in a motor vehicle to drive a driving motor of the motor vehicle. The system 10 can also transmit a charging current for charging an electric energy storage device of a motor vehicle. In this embodiment, the system 10 is designed to transmit a current between 10 and 1000 amperes, in particular between 200 and 600 amperes, and particularly advantageously between 400 and 500 amperes, for at least 20 seconds, preferably 1 minute, in particular at least 5 minutes. The upper limit of the time of the driving current or charging current to be transmitted is basically determined by the capacity of the electric energy storage device. The electric power transmitted via the high current contact devices 25, 30 can be 30kW to 400kW. For example, the voltage applied to the high current contact devices 25, 30 can be between 48V and 500V, which is obviously different from the usual 12 volt or 24 volt electric power system of the motor vehicle.

[0029] The first high-current contact device 25 has a first contact housing 35, a second contact housing 40, at least one first contact element 45 and at least one first temperature measuring device 50. Figure 1 In the example of FIG. 2 , the first high-current contact device 25 has a first sealing device 55 , a second sealing device 60 , a second contact element 65 and a second temperature measuring device 70 .

[0030] exist Figure 1 In the embodiment, the first contact element 45 and the second contact element 65 are mirror-symmetrical with respect to a symmetry plane, which is arranged centrally between the first contact element 45 and the second contact element 65. The first and second contact elements 45, 65 each include an electrically conductive and thermally conductive material. The thermal conductivity of the material is greater than 1 W / (m×K) to 2 W / (m×K) including end values.

[0031] The first temperature measuring device 50 is assigned to the first contact element 45 and the second temperature measuring device 70 is assigned to the second contact element 65. In this case, the first temperature measuring device 50 is designed to measure the first temperature T of the first contact element 45. S1 The second temperature measuring device 70 (which is identical to the first temperature measuring device 50 in this embodiment) is designed to measure the second temperature T of the second contact element 65. S2 (t).

[0032] The second high current contact device 30 is designed to correspond to the first high current contact device 25. In this embodiment, the second high current contact device 30 exemplarily has a third contact element 75 and a fourth contact element 80, and the third contact element 75 is designed to achieve electrical contact with the first contact element 45 when assembled with the first high current contact device 25. Similarly, the fourth contact element 80 is designed to form an electrical contact with the second contact element 65 when the first high current contact device 25 has been assembled on the second high current contact device 30.

[0033] In this embodiment, the polarity of the high-current contact devices 25, 30 can be selected so that, for example, the first contact element 45 and the third contact element 75 are electrically connected to a first pole of the energy storage device, for example the positive pole. The second contact element 65 and the fourth contact element 80 can, for example, be electrically connected to a second pole of the energy storage device, for example the negative pole. It is also conceivable that the contact elements 45, 65, 75, 80 are connected in parallel. Thus, for example, the contact elements 45, 65, 75, 80 can be connected only to the positive pole of the energy storage device or only to the negative pole of the energy storage device, so that the system 10 can transmit particularly high currents. This design is particularly advantageous if the drive motor has a particularly high power consumption. Therefore, the system 10 is particularly suitable for commercial vehicles.

[0034] The first contact element 45 is exemplarily implemented as a socket contact. The first contact element 45 has an insertion region 100 and a connection region 105 which is mechanically and electrically connected to the insertion region 100. The insertion region 100 extends along an insertion axis 110, which extends in the x-direction. In this embodiment, the first contact element 45 is rectilinear, so that the connection region 105 also extends along the insertion axis 110. The first contact element 45 can also be implemented as an angled contact element, i.e. the connection region 105 is inclined relative to the insertion region 100, for example vertically.

[0035] Furthermore, there may be a contact lock 111 arranged on the first contact element 45. The first sealing device 55 is arranged on the side of the first contact housing 35 facing the second high-current contact device 30. The second sealing device 60 and the second contact housing 40 are arranged on the side facing away from the second high-current contact device 30 with respect to the insertion axis 110. In the assembled state, the second contact housing 40 is fastened to the first contact housing 35 and closes the first high-current contact device 25 behind the side facing away from the second high-current contact device 30. The high-current cable 20 extends on the side facing away from the second high-current contact device 30 and is guided, for example, to a drive motor or a control unit for controlling the drive motor.

[0036] The first contact housing 35 has a first contact receiver 190 for the first contact element 45 and has a second contact receiver 195. The first contact element 45 is arranged in the first contact receiver 190 and the second contact element 65 is arranged in the second contact receiver 195. The first contact receiver 190 and the second contact receiver 195 are arranged offset from each other in the y direction. In this case, the first and second contact receivers 190, 195 can be mirror-symmetrical. The first contact receiver 190 extends substantially along the x-axis in its main extension direction.

[0037] Figure 2 Shows Figure 1 A partial perspective view of the temperature measuring device 50 , 70 of the first high-current contact device 25 is shown.

[0038] The temperature measuring devices 50, 70 each have a temperature sensor 85, a sensor housing 90 and a connecting cable 95. The temperature sensor 85 is Figure 2 The first temperature measuring device 50 is schematically shown by a dotted line. The first temperature measuring device 50 and the second temperature measuring device 70 are exemplarily identical to each other. Unless otherwise specified, the content explained below for the first temperature measuring device 50 also applies to the second temperature measuring device 70.

[0039] The temperature sensor 85 can be implemented as an NTC element, for example. Another design of the temperature sensor 85 is also conceivable. The temperature sensor 85 is embedded in the sensor housing 90. In this case, the embedding of the temperature sensor 85 in the sensor housing 90 is understood to mean that the temperature sensor 85 is completely surrounded by the sensor housing 90 in the circumferential direction, and none of the side surfaces of the temperature sensor 85 are exposed in the circumferential direction, even only partially. In addition, the sensor housing 90 can be connected to the temperature sensor 85 in a material-bonded manner, thereby avoiding unintentional detachment of the sensor housing 90 and / or the formation of a gap between the sensor housing 90 and the temperature sensor 85. In this way, moisture penetration between the sensor housing 90 and the temperature sensor 85 can be prevented. Therefore, when the first temperature T is measured by the temperature sensor 85, S1 (t), leakage current and the resulting falsification of the measurement result of the temperature sensor 85 can be avoided.

[0040] Sensor housing 90 has a first outer circumferential side 115 . Figure 2 By way of example, a sensor housing 90 is shown having a bearing contact surface 120 on the underside.

[0041] The bearing contact surface 120 is exemplarily of flat design. The bearing contact surface 120 exemplarily extends in the xy plane. The bearing contact surface 120 may also be curved.

[0042] On the first outer circumferential side 115, the sensor housing 90 has, for example, a sealing contour 135. The sealing contour 135 can have one or more sealing lips 140. The sealing contour 135 is preferably implemented around the circumference, in particular around the entire circumference, on the first outer circumferential side 115. Instead of a sealing lip 140, the sealing contour 135 can also be designed differently. For example, Figure 2 In the embodiment shown in FIG. 1 , the sealing lips 140 are arranged offset with respect to one another in the z direction.

[0043] exist Figure 2 On the upper side of the sensor housing 90, on the side facing away from the bearing contact surface 120, the sensor housing 90 has a pressing surface 145. The pressing surface 145 is parallel to the bearing contact surface 120. In this case, the pressing surface 145 can be flat and extend in the xy plane. The connecting cable 95 is exemplarily led out of the pressing surface 145 at a central position relative to the pressing surface 145.

[0044] In the z direction, opposite to the bearing contact surface 120, the connecting cable 95 of the temperature measuring device 50, 70 is led out of the pressing surface 145 in a straight line along the axis 125. When the temperature measuring device 50, 70 is assembled, the axis 125 is aligned vertically with respect to the insertion axis 110. For example, the axis 125 extends in a plane perpendicular to the insertion axis 110. In this case, Figure 2As shown, axis 125 may extend along the z-direction.

[0045] The connecting cable 95 can be bent at a distance from the sensor housing 90 in order to guide the connecting cable 95 to an evaluation device of the motor vehicle.

[0046] The connecting cable 95 has a first cable sheath 150. The first cable sheath is made of an electrically insulating material. The first cable sheath 150 can include a first matrix material, which includes, for example, silicone, polyurethane, polyethylene. In addition, the connecting cable 95 includes at least one sensor line 155, which is electrically conductive and provides an electrical connection between the temperature sensor 85 and the evaluation device. The sensor line 155 is completely surrounded by the first cable sheath 150 in the circumferential direction.

[0047] The connecting cable 95 is guided to the temperature sensor 85. Advantageously, the first subsection 160 of the connecting cable 95 is embedded in the sensor housing 90. The sensor housing 90 is preferably connected in a material-bonded manner to the first cable sheath 150 in the first subsection 160. The material-bonded connection prevents the formation of leakage gaps. This prevents moisture and / or water from entering the area of ​​the connecting cable 95 and the sensor housing 90.

[0048] Figure 3 Shown along Figure 1 The cross section AA shown is Figure 1 A detail of a cross-sectional view of the first high-current contact device 25 is shown.

[0049] When the first temperature measuring device 50 is in the assembled state, the bearing contact surface 120 in the connection region 105 of the first contact element 45 lies flat against the second outer circumferential side 130 of the first contact element 45. It is particularly advantageous if the bearing contact surface 120 is realized corresponding to the second outer circumferential side 130 of the first contact element 45.

[0050] The high current cable 20 has a second subsection 165 and a third subsection 170. The third subsection 170 is adjacent to an end 171 of the high current cable 20. The second subsection 165 is spaced apart from the end 171 of the high current cable 20.

[0051] The high current cable 20 has an electrical conductor 175 which preferably has a cross-sectional area of ​​at least 15 square millimeters, in particular at least 25 square millimeters, particularly advantageously at least 50 square millimeters. The electrical conductor 175 can be a fine or very fine stranded structure.

[0052] The high current cable 20 further has a second cable sheath 180 which surrounds and protects the electrical conductor 175 on the circumferential side of the second subsection 165. In this case, the second cable sheath 180 electrically insulates the electrical conductor 175.

[0053] In the third subsection 170, the second cable sheath 180 is spaced apart from the electrical conductor 175, and the electrical conductor 175 is arranged in a connection receiver 185 of the connection region 105. Preferably, the connection region 105 is crimped in the connection receiver 185. Additionally or alternatively, further material bonding and / or forced and / or non-forced connection means may be used to electrically and mechanically connect the third subsection 170 to the connection receiver 185.

[0054] The sensor housing 90 thermally connects the temperature sensor 85 to the second outer circumferential side 130 of the connection region 105. For this purpose, the sensor housing 90 preferably comprises at least one of the following second matrix materials: silicone, polyurethane, polyethylene. It is particularly advantageous that the first matrix material is identical to the second matrix material. The advantage of this design is that when the first temperature measuring device 50 is manufactured by an injection molding process, the temperature sensor 85 and the first subsection 160, which are already connected to the connecting cable 95, can be encapsulated with the second matrix material, which is still liquid or viscous and will be cured, and the second matrix material achieves a material-bonded connection with the first matrix material of the first cable sheath 150 when it is cured. A particularly good bond between the first cable sheath 150 and the sensor housing 90 is thereby ensured.

[0055] Furthermore, at least one particle filler, for example aluminum and / or silver and / or copper, can be embedded in the second matrix material of the sensor housing 90. Due to the filler, the thermal conductivity of the sensor housing 90 is particularly high. As a result, the thermal conductivity of the sensor housing 90 is 100 to 300 W / (m×K).

[0056] On one side of the first contact housing 35, for example Figure 3 On the upper side, the first contact housing 35 has at least one collar portion 200, which is realized circumferentially around the axis 125. Preferably, one collar portion 200 is realized for each contact receiver 190, 195. The collar portion 200 delimits a sensor receiver 205 with an inner circumferential side 206 of the collar portion 200. The sensor receiver 205 opens into the associated contact receiver 190, 195 (at Figure 3 In the middle is the interior of the first contact receiver 190).

[0057] Furthermore, the first high-current contact device 25 can have a sensor cover 210. In this exemplary embodiment, for each collar part 200, one sensor cover 210 is arranged on the collar part 200, respectively.

[0058] The fourth subsection 215 of the temperature measuring device 50, 70 engages in the sensor receiver 205. The fifth subsection 220 of the temperature measuring device 50, 70 extends into the corresponding contact receiver 190, 195. The sensor housing 90 abuts against the inner circumferential side 206 via the sealing contour 135, in particular the sealing lip 140, so that the sensor receiver 205 is sealed from the environment of the system 10 and liquid is prevented from entering laterally across the sensor housing 90 via the sensor receiver 205. Corrosion of the contact elements 45, 65, 75, 80 is thereby prevented. Instead of the sealing contour 140, a sealing element can also be arranged between the sensor housing 90 and the inner circumferential side 206.

[0059] On the side facing away from the first contact element 45, a sensor cover 210 is attached to the collar portion 200. The sensor cover 210 closes the sensor receiver 205 on the side facing away from the contact receivers 190, 195 (in the z-direction).

[0060] The sensor cover 210 rests with its inner side 225 against the pressing surface 145 of the sensor housing 90. It is particularly advantageous if the sensor cover 210 has at least one web 230 on the inside. Preferably, a plurality of webs 230 are arranged on the sensor cover 210 offset from one another in the x direction. Each web 230 is plate-shaped and extends, for example, in the yz plane. The free end of each web 205 forms the inner side 225 of the cover.

[0061] The sensor cover 210 also has a circumferential edge 231. The edge 231 may be positively connected to the collar portion 200, for example by latching means.

[0062] In the assembled state, the free end of the web 230 abuts against the pressing surface 145 together with the inner side 225 of the cover. The sensor cover 210 is also latched to the collar portion 200. The sensor cover 210 thus provides a pressing force F acting along the axis 125. P . Using the pressing force F P , the sensor cover 210 acts on the pressing surface 145 and presses the sensor housing 90 against the second outer circumferential side 130 of the associated contact element 45, 65, 75, 80. Figure 3 In the embodiment shown in FIG. 4 , the sensor housing 90 of the first temperature measuring device 50 is pressed against the second outer circumferential side 130 of the first contact element 45 .

[0063] exist Figure 3 In the embodiment, the first contact element 45 provides a resistance to the pressing force F P As a result of the pressing, the bearing contact surface 120 lies flat against the second outer circumferential side 130 , so that the heat transfer resistance between the first contact element 45 and the sensor housing 90 is particularly low.

[0064] Preferably, the pressing force F P and the corresponding reaction force F G The pressure F is selected so that the sensor housing 90 is reversibly elastically deformable between 10% and 40% at least in the vertical direction between the temperature sensor 85 and the bearing contact surface 120. In this way, the heat transfer resistance between the bearing contact surface 120 and the sensor housing 90 can be further reduced. P Particularly effective introduction into the pressing surface 145 can be achieved by means of a plurality of webs 230 in the sensor housing 90 .

[0065] Furthermore, the sensor cover 210 may have an introduction wire 235 introduced into the sensor receiver 205. The connection cable 95 is led out of the sensor receiver 205 through the introduction wire 235. Furthermore, the connection cable 95 is guided between two adjacent webs 230, thereby preventing the connection cable 95 from being pinched.

[0066] Figure 4 Shown in assembled state Figure 1 The system 10 shown is along Figure 1 A cross-sectional view of the cross section shown.

[0067] In this case, for clarity, Figure 4 In FIG. 1 , the second high-current contact device 30 is only schematically indicated by a dotted line.

[0068] In the assembled state, the first contact element 45 contacts the third contact element 75 and the second contact element 65 contacts the fourth contact element 80 .

[0069] In case of contact between the first contact element 45 and the third contact element 75, the system 10 has a first ohmic contact resistance in the insertion area 100. Likewise, the connection device 15 has a second ohmic contact resistance at the electrical contact between the electrical conductor 175 of the high current cable 20 and the connection receiver 185 of the first electrical contact element 45.

[0070] During current transmission, in particular currents greater than 100 Amperes, the contact element 45 , 65 , 75 , 80 heats up due to the first and second ohmic contact resistances and the internal ohmic resistance of the contact element 45 , 65 , 75 , 80 .

[0071] Due to the short distance between the temperature sensor 85 of the temperature measuring device 50, 70 and the associated first or second contact element 45, 65 and the good thermal connection of the temperature sensor 85 to the connecting portion 105 via the sensor housing 90, the temperature sensor 85 of the first temperature measuring device 50 can measure the first temperature T of the connecting region 105 of the first contact element 45 in a particularly precise manner. S1Similarly, the temperature sensor 85 of the second temperature measuring device 70 measures the second temperature T of the connecting portion of the second contact element 65. S2 (t).

[0072] If the third temperature T of the insertion region 100 of the first contact element 45 K3 (t) and a first temperature T measured by the temperature sensor 85 at the connection region 105 of the first contact element 45 S1 (t) is measured at time t, then Figures 1 to 4 In the embodiment shown, it can be seen that the first temperature T S1 (t) corresponds to the third temperature T K3 (t), differ by only a few degrees Kelvin (less than 6 Kelvin, in particular less than 4 Kelvin), and have a temperature similar to the third temperature T K3 (t) has essentially the same time curve. Due to direct thermal coupling, the first measured temperature T S1 (t) corresponds substantially to the third temperature T of the insertion region 100 K3 (t). The evaluation device may take into account the first temperature T S1 (t) and the third temperature T K3 (t) The temperature difference between

[0073] Therefore, the first and second temperatures T measured by the temperature sensor 85 are S1 (t), T S2 (t) represents an accurate indirect temperature measurement of the first contact element 45 and the second contact element 65 in the insertion region 100. The respective temperature sensor 85 supplies the measured first and second temperature T to the evaluation device via the connecting cable 95, respectively. S1 (t), T S2 The evaluation device may take into account the measured first temperature T S1 (t) and the second temperature T S2 (t) for controlling a drive motor of a motor vehicle, for example. In order to keep the first and second contact resistances low, first and second sealing means 55, 60 seal the contact elements 45, 65, 75, 80 from the environment.

[0074] Figures 1 to 4 The illustrated embodiment of the system 10 is particularly well suited for particularly precise and accurate measurement of dynamically changing current loads transmitted through the system 10 between the high current cable 20 and the third and fourth contact elements 75 , 80 , in particular to an electrical energy storage device.

[0075] The connecting cable 95 allows the temperature sensor 85 to be flexibly connected to the evaluation device. Since the temperature sensor 85 is encapsulated by the sensor housing 90 and since the sensor housing 90 is connected to the material bond of the temperature sensor 85 and the first cable sheath 150, the temperature sensor 85 is protected against the ingress of moisture. Leakage currents are thereby prevented, so that the temperature sensor 85 measures the first or second temperature T in a particularly precise manner. S1 (t), T S2 (t).

[0076] Figures 1 to 4 The design described in is also particularly suitable for high-current contact devices 25 , 30 , which are in contact with each other and are mechanically locked, for example, by a lever device 240 .

[0077] Reference numerals list

[0078] 10 System

[0079] 15Connection device

[0080] 20 High Current Cable

[0081] 25First high current contact device

[0082] 30 Second high current contact device

[0083] 35 first contact housing

[0084] 40 second contact housing

[0085] 45 first contact element

[0086] 50 first temperature measuring device

[0087] 55 first sealing device

[0088] 60 Second sealing device

[0089] 65 second contact element

[0090] 70 Second temperature measuring device

[0091] 75 Third contact element

[0092] 80 fourth contact element

[0093] 85 Temperature Sensor

[0094] 90 sensor housing

[0095] 95 connection cable

[0096] 100 Insertion region (of first contact element)

[0097] 105 Connection region (of the first contact element)

[0098] 110 Insert axis

[0099] 111 contact lock

[0100] 115 first outer circumferential side

[0101] 120 Support contact surface

[0102] 125 axis

[0103] 130 second outer circumferential side

[0104] 135 Sealing profile

[0105] 140 sealing lip

[0106] 145 Pressing surface

[0107] 150 First Cable Sheath

[0108] 155 sensor line

[0109] 160 First subsection (of connecting cable)

[0110] 165 Second sub-part

[0111] 170 Third Subsection

[0112] 171 end

[0113] 175 Electrical conductor

[0114] 180 second cable sheath

[0115] 185 Connect the receiver

[0116] 190 First Contact Receiver

[0117] 195 Second contact receiver

[0118] 200 ring parts

[0119] 205 sensor receiver

[0120] 206 inner circumference side

[0121] 210 sensor cover

[0122] 215 Fourth Subsection

[0123] 220 Fifth Subsection

[0124] 225 Inside of the cover

[0125] 230 belly plate

[0126] 231 Edge

[0127] 235 lead-in line

[0128] 240 lever device

[0129] F P Pressing force

[0130] F G Reaction force

[0131] T S1 (t) First temperature

[0132] T S2 (t) Second temperature

[0133] T K3 (t) Third temperature

Claims

1. A high current contact device (25), - comprising a contact element (45, 65), a contact housing (40) and a temperature measuring device (50, 70), -in, The contact housing (35) has a contact receiver (190) for receiving the contact element (45, 65). wherein the contact element (45, 65) can be at least partially inserted along an insertion axis (110) into a further contact element (75) of a further high-current contact device (30), - wherein the contact housing (35) has a sensor receiver (205) which is inclined relative to the insertion axis (110), - wherein the sensor receiver (205) leads to a contact receiver (190), - wherein the temperature measuring device (50, 70) is at least partially arranged in the sensor receiver (205), wherein the temperature measuring device (50, 70) is against the outer circumferential side (130) of the contact element (45, 65) for measuring the temperature (T S1 (t)), - wherein the contact housing (35, 40) has a collar portion (200), - wherein, internally, said collar portion (200) defines a sensor receiver (205), - wherein the sensor housing (90) of the temperature measuring device (50, 70) abuts against the inner circumferential side (206) of the collar portion (200), - having a sensor cover (210) arranged outside the contact housing (35, 40), - wherein the sensor cover (210) at least partially closes the exterior of the sensor receiver (205), wherein the inner side (225) of the sensor cover (210) bears against the temperature measuring device (50, 70) on the side facing away from the contact element (45, 65).

2. The high current contact device (25) according to claim 1, - wherein the temperature measuring device (50, 70) comprises a temperature sensor (85) and the sensor housing (90), -in, The temperature sensor (85) is embedded in a sensor housing (90). wherein the sensor housing (90) bears against the contact element (45, 65) and thermally couples the temperature sensor (85) to the contact element (45, 65), - wherein the temperature sensor (85) is designed to measure the temperature (T K (t)).

3. The high current contact device (25) according to claim 2, -in, The temperature measuring device (50, 70) has a connecting cable (95). wherein the connecting cable (95) has a first cable sheath (150) and at least one electrically insulating and electrically conductive sensor line (155) passing through the first cable sheath (150), wherein the connection cable (95) is led to a temperature sensor (85) and the sensor line (155) is electrically connected to the temperature sensor (85), - wherein the sensor housing (90) is connected to the first cable sheath (150) in a materially bonded manner, - wherein a connecting cable (95) embedded in a subsection (160) in the sensor housing (90) is guided to the temperature sensor (85).

4. A high current contact device (25) according to claim 2 or 3, - wherein the sensor housing (90) and the first cable jacket (150) comprise substantially the same matrix material, and / or -in, The sensor housing (90) and / or the first cable jacket (150) comprises at least one of the following matrix materials: - Silicone, polyethylene, polyurethane, - wherein at least one of the following fillers is embedded in the matrix material of the sensor housing (90): copper, aluminum, silver.

5. A high current contact device (25) according to claim 2 or 3, - wherein the thermal conductivity of the sensor housing (90) is between 1 W / (m·K) and 2 W / (m·K), inclusive.

6. A high current contact device (25) according to any one of claims 1 to 3, wherein the contact element (45, 65) has an insertion region (100) and a connection region (105) connected to the insertion region (100), -in, The connection area (105) has a connection receiver (185) inside for receiving and electrically contacting an electrical conductor (175) of a high current cable (20). wherein the insertion region (100) is designed to achieve electrical contact with a further contact element (75), - wherein the temperature measuring device (50, 70) bears against the outer circumferential side (130) of the connecting region (105).

7. The high current contact device (25) according to claim 1, - wherein the sensor housing (90) has a circumferential sealing contour (135) which is realized around the circumference of the sensor housing (90), -in, The sealing profile (135) abuts against the inner circumferential side (206) of the collar portion (200) and sealingly contacts the receiver (190).

8. The high current contact device (25) according to claim 3, - wherein the inner side (225) of the sensor cover (210) ensures physical contact between the temperature measuring device (50, 70) and the contact element.

9. The high current contact device (25) according to claim 8, wherein the sensor housing (90) is arranged in a tensioned manner in the sensor receiver (205) and the bearing contact surface (120) of the temperature measuring device (50, 70) is arranged with a pressing force (F P ) is pressed against the outer circumferential side (130) of the contact element (45, 65).

10. The high current contact device (25) according to claim 8, - wherein the sensor cover (210) has an incoming line (235) leading to the sensor receiver (205), -in, The connecting cable (95) is led out of the sensor receiver (205) via an incoming line (235).

11. The high current contact device (25) according to claim 8, - wherein the sensor cover (210) has a circumferential edge (231), -in, The edge (231) is arranged outside the collar portion (200) and is forcibly connected to the collar portion (200).

12. A connection device (15) for transmitting electrical energy in a motor vehicle, - having a high-current contact device (25) and a high-current cable (20) according to any one of claims 1 to 11, -in, The high current cable (20) comprises an electrical conductor (175) and a second cable sheath (180) enclosing the electrical conductor (175). - wherein the electrical conductor (175) is designed to transmit electrical energy, - wherein the electrical conductor (175) is electrically connected to the contact element (45, 65).

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