Welded joint arrangement for cooled power transmission

Abstract

Welded connection arrangement (100, 200, 300, 400, 500, 600) for cooled power transmission from an electrical consumer to a storage medium, the welded connection arrangement (100) comprising: a tubular electrical line (110) configured to conduct current, the tubular electrical line (110) comprising a first end (110a) for electrical connection to an electrical load and a second end (110b) for electrical connection to a storage medium, and further configured to receive a coolant for cooling the tubular electrical line (110); an electrically conductive contact member (120) attached to a respective end (110a, 110b) of the tubular electrical conduit (110) for electrically contacting the tubular electrical conduit (110); and a closure plug (130) which is inserted into the tubular electrical line (110) at the respective end (110a, 110b) of the tubular electrical line (110) and is welded to the tubular electrical line (110) together with the electrically conductive contact part (120) in order to close the tubular electrical line (110) against the escape of coolant; wherein the electrically conductive contact part (120) is welded to the tubular electrical line (110) by means of the sealing plug (130) and thus hermetically seals the tubular electrical line (110) against coolant leakage.

Description

Technical field

[0001] The invention relates to a friction-welded connection arrangement for cooled power transmission and a friction welding method for connecting an electrically conductive hollow body. The present invention relates to a welded connection arrangement for cooled power transmission, for example, from a charging socket or charging adapter to a battery of an electrically operated vehicle. State of the art

[0002] Electric vehicles use electrical cables that electrically connect the vehicle's battery to the charging socket to charge the battery. These cables are increasingly required to transmit large amounts of current in a very short time, which leads to significant heating of the cable. Since these electrical cables are currently not cooled, they must be designed with a correspondingly large cross-section to compensate for the electrical power loss. This leads to increased material consumption due to the necessary larger cross-sections, thus wasting resources, and reduced charging performance during power transmission, thus resulting in lost time and energy during the charging process.

[0003] The document DE 102020 106415 A1 describes a friction welded connector and a method for establishing an electrical connection by materially joining a first contact part to a second contact part.

[0004] The document DE 102013 101876 B3 describes a method for the material-to-material joining of a cable with a connecting element and a cable configured according to the method.

[0005] The document DE 10 2016 223 991 A1 discloses an on-board electrical system for a motor vehicle, comprising an electrical energy storage device and an on-board electrical system component which is connected to the energy storage device by an electrical line connection.

[0006] The document EP 3 007 184 A1 discloses an electrical socket comprising an electrically insulating sleeve with a central longitudinal through-hole running along a central longitudinal axis of the socket.

[0007] JP 2019-9090 A discloses a conductor with a heat absorber. The conductor comprises a cylindrical conductor body portion and a pair of electrical terminals arranged in a direction along an axis of the conductor body portion and formed by a flattened opening end of the conductor body portion.

[0008] The document DE 10 2021 002 532 A1 discloses a component for tempering or cooling a component of a motor vehicle, comprising a carrier element, an intermediate element and a line element formed separately from the carrier element and the intermediate element.

[0009] The document US 2013 / 0 098 973 A1 discloses methods for producing completely closed hollow structures by means of friction stir welding.

[0010] The document DE 10 2017 114 994 B3 discloses a method for producing an electrical cable arrangement.

[0011] The document EP 3 637 552 A1 discloses a copper-aluminum connector.

[0012] The publication CN 2 08 520 045 U discloses a copper-aluminum combination discharge assembly. Description of the invention

[0013] An object of the invention is therefore to create a concept for efficient power transmission between an electrical consumer and a storage medium, for example between the charging socket and the battery of the vehicle, by means of an electrical cable, in which the cable can be designed in a resource-saving manner and also enables rapid charging of the storage medium or the battery.

[0014] The object is achieved by the subject matter of the independent claims. Advantageous developments of the invention are specified in the dependent claims, the description, and the accompanying figures.

[0015] The inventive solution is based on the idea of using a welded connection arrangement to achieve efficient cooling of the electrical cable between the electrical load, such as a charging socket, and the storage medium, such as a battery. A hollow body or a tubular electrical cable, such as an aluminum tube, is used as the cable for power transmission.

[0016] The respective cable connection is connected to a contact part by means of welding, preferably friction welding, and a filling pin (hereinafter also referred to as plug), as described below for the Fig. 1 and Fig. 2. In a special case, a rotationally symmetrical contact part (for example a friction welding tool “CCS DC PIN”) can be welded directly to the hollow body by friction welding, as described below. Fig. 3 is explained in more detail.

[0017] A cooling medium can be placed inside the waveguide, allowing the line to cool down as it heats up. This can be achieved by circulating the cooling circuit, for example, with a water-glycol mixture, or by completely filling the waveguide with a latent heat storage medium (PCM - Phase Change Material).

[0018] In the case of the circulating variant, connection openings must be provided radially on the waveguide or on the front side in the area of the contact zone, as described below for the Fig. 4, Fig. 5 and Fig. 6 is explained in more detail.

[0019] This inventive solution offers the technical advantages of low-loss and faster charging with higher charging currents, a reduction in the cable cross-section and thus weight savings, and range optimization due to the higher charging currents and lower weight.

[0020] According to a first aspect, the above-described object is achieved by a welded connection arrangement for cooled power transmission from an electrical consumer, for example a charging socket, to a storage medium, for example a battery, for example a battery of an electrically operated vehicle, wherein the welded connection arrangement comprises the following: a tubular electrical line configured to conduct power, wherein the tubular electrical line comprises a first end for electrical connection to the electrical consumer and a second end for electrical connection to the storage medium, and is further configured to receive a coolant for cooling the tubular electrical line; an electrically conductive contact part attached to a respective end of the tubular electrical line for electrically contacting the tubular electrical line;and a closure plug which is inserted into the tubular electrical line at the respective end of the tubular electrical line and is welded to the tubular electrical line together with the electrically conductive contact part in order to close the tubular electrical line against the escape of coolant, wherein the electrically conductive contact part is welded to the tubular electrical line by means of the closure plug and thus hermetically seals the tubular electrical line against the escape of coolant.;

[0021] This welded connection arrangement implements an advantageous concept for efficient power transmission between an electrical consumer, for example a charging socket, and a storage medium, for example a battery, for example a battery of an electrically operated vehicle, by means of an electrical cable. The cable can be designed to conserve resources and also enables rapid charging of the storage medium, for example the battery. It is understood that this welded connection arrangement can also be used to create an electrical connection to a suitable charging adapter for charging the battery instead of an electrical connection to a charging socket of a charging station or a battery charger. The charging socket is mentioned here only as an example of an electrical consumer. A variety of other electrical consumers can be used instead of the charging socket.

[0022] The welded joint arrangement enables efficient cooling of the electrical cable. This enables low-loss and faster charging with higher charging currents. The welded joint arrangement presented here allows the cross-section of the electrical cable to be reduced, thus leading to weight savings. Due to the higher charging currents and lower weight, the range of the electrical cable can be increased, which leads to additional operating convenience when charging the vehicle.

[0023] The tubular electrical conduit can, for example, be formed from circular tubes. Alternatively, it can be formed from square tubes. Support struts can be mounted inside the tubular electrical conduit to maintain the corresponding tubular shape. Furthermore, chambers can be mounted inside the tubular electrical conduit to appropriately direct the flow of coolant. For example, a first chamber can be configured to conduct coolant in a first direction, and a second chamber can be configured to conduct coolant in the opposite direction, thus enabling appropriate circulation of the coolant.

[0024] The sealing plug also serves as a material filling pin, which supplies sufficient material to weld the electrical contact part and the tubular electrical cable in a material-to-material manner, so that no coolant can escape from the corresponding end of the cable.

[0025] According to an exemplary embodiment of the welded connection arrangement, the welded connection arrangement forms a friction welded connection arrangement in which the electrically conductive contact part together with the closure plug is friction welded to the tubular electrical line.

[0026] Such a friction-welded connection arrangement is particularly advantageous when different metals are to be welded together. For example, a copper contact can be advantageously welded to an aluminum tube.

[0027] According to an exemplary embodiment of the welded connection arrangement, the electrically conductive contact part and the tubular electrical line consist of different metals which are welded together.

[0028] This provides the technical advantage that the contact part and the electrical cable can have different electrical and mechanical properties. For example, the contact part can exhibit very good electrical conductivity, while the electrical cable can be lightweight and flexible.

[0029] According to an exemplary embodiment of the welded connection arrangement, the tubular electrical line and the closure plug are made of aluminum and the electrically conductive contact part is a copper part which is welded together with the aluminum of the tubular line and the aluminum of the closure plug.

[0030] This provides the technical advantage that conventional industrially produced electrical contact parts and industrially produced pipelines can be used to construct the welded connection arrangement.

[0031] The electrically conductive contact part is welded to the tubular electrical cable by means of the sealing plug.

[0032] This provides the technical advantage that the tubular electrical cable is hermetically sealed against coolant leakage.

[0033] According to an exemplary embodiment of the welded connection arrangement, the electrically conductive contact part has a first portion and a second portion that are mechanically rigidly connected to one another; wherein the first portion is tubular and is welded to the respective end of the tubular electrical line.

[0034] This provides the technical advantage that the electrically conductive contact part can be flexibly connected to the storage medium, such as the battery, or the electrical load, such as the charging socket, on the one hand, and to the tubular electrical cable, on the other. The first contact part can be adapted to an electrical and mechanical connection of the storage medium or the electrical load, while the second contact part can be adapted to the tubular electrical cable.

[0035] According to an exemplary embodiment of the welded connection arrangement, the first portion is a tubular hollow body which is welded at the respective end of the tubular electrical conduit to an outer surface of the tubular electrical conduit; wherein the closure plug is mounted at the respective end in the tubular electrical conduit and is welded to an inner surface of the tubular electrical conduit.

[0036] This provides the technical advantage that the first section has the largest possible contact area with the tubular hollow body, through which the current can flow. Secondly, the welded material of the sealing plug inserted inside the tubular electrical cable can efficiently seal the tubular electrical cable, preventing coolant from escaping.

[0037] According to an exemplary embodiment of the welded connection arrangement, the second section is plate-shaped and has a bore for mechanical and electrical contacting.

[0038] This provides the technical advantage that the plate-shaped terminal of the second section forms a sufficiently large surface area for current to flow when connected to the battery. The second section of the electrically conductive contact part can be easily and efficiently connected to the battery via a screw connection via the hole.

[0039] According to an exemplary embodiment of the welded connection arrangement, the first portion is a rotationally symmetrical body which is welded at the respective end of the tubular electrical line to the closure plug on an inner surface of the tubular electrical line.

[0040] This provides the technical advantage that the first section can be firmly connected to the tubular electrical cable using a friction welding process by using the sealing plug as a material filling pin.

[0041] According to an exemplary embodiment of the welded joint arrangement, the first section is formed as a rotationally symmetrical friction welding tool.

[0042] This provides the technical advantage that the electrically conductive contact part can be easily inserted into a friction welding machine, with which the welding can be carried out as a friction weld.

[0043] According to an exemplary embodiment of the welded connection arrangement, the second section is a rotationally symmetrical body which has a plug contact for mechanical and electrical contacting.

[0044] This provides the technical advantage that the electrically conductive contact part can be easily connected to an electrical consumer or charging socket via the second section. The electrical cable can be easily connected to the electrical consumer or charging socket by plugging in the second section, and can also be easily disconnected from the electrical consumer or charging socket by detaching the second section.

[0045] According to an exemplary embodiment of the welded connection arrangement, the tubular electrical conduit has at least one lateral bore for introducing coolant; wherein a cooling connection is mounted in the lateral bore for introducing or discharging the coolant into or from the tubular electrical conduit.

[0046] This provides the technical advantage that coolant can efficiently enter or exit the tubular electrical cable via the lateral bore. The tubular electrical cable can thus be efficiently cooled via the cooling connection.

[0047] According to an exemplary embodiment of the welded connection arrangement, the closure plug has a cooling connection for introducing the coolant into the tubular electrical line.

[0048] This provides the technical advantage that coolant can efficiently enter or exit the tubular electrical line via the cooling connection on the sealing plug. The tubular electrical line can therefore be efficiently cooled via the cooling connection. The cooling connection can also be attached flexibly, either on the sealing plug or on the side hole in the tubular electrical line, or at both locations. One cooling connection can be used to introduce coolant and the other to discharge coolant. Alternatively, coolant can be both introduced and discharged via a single cooling connection, for example if the tubular electrical line has a chamber-like structure.

[0049] According to an exemplary embodiment of the welded connection arrangement, the tubular electrical line has a T-shaped connecting piece with three tubular line connections at at least one of the ends.

[0050] This provides the technical advantage of enabling flexible cable routing via the T-shaped connector. Various electrical and coolant lines can thus be connected at different levels.

[0051] According to an exemplary embodiment of the welded connection arrangement, a first line connection of the three tubular line connections is designed as a coolant connection, a second line connection of the three tubular line connections is welded to the electrically conductive contact part; and a third line connection of the three tubular line connections is welded to the tubular electrical line.

[0052] This provides the technical advantage that the T-shaped connector has a prefabricated connection for a cooling line, so that no hole for a cooling connection needs to be made in the tubular electrical line.

[0053] The three line connections can be designed flexibly. For example, the second and third line connections can be arranged in opposite directions to each other, and the first line connection can be orthogonal to both. Alternatively, the first and second line connections can be arranged in opposite directions to each other, and the third line connection can be orthogonal to both. Other geometries are, of course, not excluded.

[0054] According to a second aspect, the object described above is achieved by a method for producing a welded connection arrangement for cooled power transmission from an electrical consumer, for example a charging socket, to a storage medium, for example a battery, for example a battery of an electrically operated vehicle, the method comprising the following steps: providing a tubular electrical line with a first end for electrical connection to the electrical consumer and a second end for electrical connection to the storage medium, the tubular electrical line being designed to receive coolant; introducing a closure plug into the tubular electrical line at a respective end of the tubular electrical line;Attaching an electrically conductive contact part to a respective end of the tubular electrical line for electrically contacting the tubular electrical line; and welding the closure plug together with the electrically conductive contact part to the tubular electrical line at the respective end of the tubular electrical line in order to close the same against the escape of coolant, wherein the electrically conductive contact part is welded to the tubular electrical line by means of the closure plug and thus hermetically seals the tubular electrical line against the escape of coolant.

[0055] This method realizes an advantageous concept for efficient power transmission between an electrical consumer, for example a charging socket, and a storage medium, for example a battery, for example a battery of an electrically operated vehicle, by means of a welded connection arrangement, in which the cable can be designed in a resource-saving manner and also enables rapid charging of the storage medium or the battery.

[0056] The process allows the production of a welded joint arrangement that enables efficient cooling of the electrical cable. With such a welded joint arrangement, low-loss and faster charging with higher charging currents can be achieved. As already described above, the welded joint arrangement presented here allows the cross-section of the electrical cable to be reduced, thus leading to weight savings. Due to the higher charging currents and lower weight, the range of the electrical cable can be increased, which leads to additional operating convenience when charging the vehicle.

[0057] According to an exemplary embodiment of the method, the welding comprises friction welding, in which the electrically conductive contact part together with the closure plug is friction welded to the tubular electrical line.

[0058] Friction welding is particularly advantageous when welding dissimilar metals together. For example, a copper contact can be advantageously welded to an aluminum tube.

[0059] According to an exemplary embodiment of the method, the method comprises attaching a cooling connection to the tubular electrical line and introducing or discharging coolant into or out of the tubular electrical line via the cooling connection.

[0060] This provides the technical advantage that coolant can efficiently enter or exit the tubular electrical line via the cooling connection. The tubular electrical line can thus be efficiently cooled via the cooling connection. Short character description

[0061] The invention is described in more detail below using exemplary embodiments and the figures. They show: Fig. 1 an exploded view of the connection zone of a welded connection arrangement 100 according to the invention; Fig. 2 is a schematic representation of a welded connection arrangement 200 according to the invention, in which both ends 110a, 110b are contacted; Fig. 3 is a schematic representation of a welded connection arrangement 300 according to the invention, in which the electrical contact part is formed as a friction welding tool; Fig. 4 a schematic representation of a welded connection arrangement 400 according to the invention with a cooling connection on the pipe; Fig. 5 a schematic representation of a weld connection arrangement 500 according to the invention with a cooling connection pin; and Fig. 6 a schematic representation of a welded connection arrangement 600 according to the invention with a terminal as a T-piece.

[0062] The figures are merely schematic representations and serve only to illustrate the invention. Identical or equivalent elements are provided with the same reference numerals throughout.

[0063] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. It is understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense. Further, it is to be understood that the features of the various embodiments described herein may be combined with one another unless specifically indicated otherwise.

[0064] The aspects and embodiments are described with reference to the drawings, wherein like reference numerals generally refer to like elements. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more aspects of the invention. However, it may be apparent to one skilled in the art that one or more aspects or embodiments may be practiced with a lesser level of specific detail. In other instances, well-known structures and elements are shown in schematic form to facilitate describing one or more aspects or embodiments. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the concept of the present invention.

[0065] Fig. 1 shows an exploded view of the connection zone of a welded connection arrangement 100 according to the invention.

[0066] A hollow body 110 (for example, an aluminum tube) is used as a line for power transmission, which is also referred to below as a tubular electrical line 110. The respective line connection is integrally connected to a contact part 120 by means of friction welding and a filling pin 130, also referred to below as a sealing plug 130.

[0067] A cooling medium can be placed in the pipe 110, which allows the line to cool down when heated.

[0068] In Fig. 1 shows the connection zone or joining zone in more detail as an exploded view.

[0069] A Cu contact part 120 serves as a possible screw-on point in the vehicle. The aluminum tube 110 serves as a conductor and thus a current carrier, and can also be filled with a cooling medium. The aluminum filler pin 130 serves as a filler material for the friction welding process to completely close the joining zone. By closing the two connection zones, as shown in Fig. 2, a hollow area is created between the two contacts 121, which can be filled with a cooling medium.

[0070] In the following, the welded joint arrangement 100 is described in more detail in a more general manner.

[0071] The welded connection arrangement 100 is used for cooled power transmission from an electrical consumer, such as a charging socket, to a storage medium, such as a battery, such as a battery of an electrically powered vehicle. However, it can also be used for other purposes, such as any type of power transmission that involves significant heat generation, making cooling necessary. Examples include use in electric motors, heat pumps, underfloor heating systems, air conditioning units, and many other applications.

[0072] The welded connection arrangement 100 comprises a tubular electrical line 110 configured to conduct current from the electrical load, for example, the charging socket, to the storage medium, for example, the battery. The tubular electrical line 110 comprises a first end 110a for electrical connection to the electrical load, for example, the charging socket, and a second end 110b for electrical connection to the storage medium, for example, the battery. Fig. 1 only the first end 110a is shown, in Fig. 2, both ends 110a, 110b are shown. The second end 110b can be constructed analogously. The tubular electrical line 110 is further configured to accommodate a coolant for cooling the tubular electrical line 110.

[0073] The welded connection arrangement 100 comprises an electrically conductive contact part 120, which is attached to a respective end 110a, 110b of the tubular electrical line 110 to electrically contact the tubular electrical line 110. For example, an electrical contact can be made with the storage medium or the battery at the first end 110a, and an electrical contact can be made with the electrical load or the charging socket at the second end 110b.

[0074] The welded connection arrangement 100 comprises a closure plug 130 which is inserted into the tubular electrical line 110 at the respective end 110a, 110b of the tubular electrical line 110 and is welded to the tubular electrical line 110 together with the electrically conductive contact part 120 in order to close the tubular electrical line 110 against the escape of coolant.

[0075] The welded connection arrangement 100 can, for example, form a friction welded connection arrangement in which the electrically conductive contact part 120 together with the closure plug 130 is friction welded to the tubular electrical line 110.

[0076] For example, the electrically conductive contact part 120 and the tubular electrical line 110 may be made of different metals that are welded together.

[0077] For example, the tubular electrical conduit 110 and the closure plug 130 may be made of aluminum, and the electrically conductive contact part 120 may be a copper part welded together with the aluminum of the tubular conduit 110 and the aluminum of the closure plug 130.

[0078] The electrically conductive contact part 120 can be integrally welded to the tubular electrical line 110 by means of the sealing plug 130. Thus, the electrically conductive contact part 120 can form a unit or molded part with the sealing plug 130 and the electrical line 110.

[0079] The electrically conductive contact part 120 may have a first portion 120a and a second portion 120b, as described in more detail in Fig. 2, which are mechanically rigidly connected to one another. The first section 120a of the electrically conductive contact part 120 can be tubular and welded to the respective end of the tubular electrical line 110.

[0080] The first section 120a can be a tubular hollow body that is welded to an outer surface of the tubular electrical line 110 at the respective end 110a, 110b of the tubular electrical line 110. The closure plug 130 can be attached to the respective end 110a, 110b in the tubular electrical line 110 and welded to an inner surface of the tubular electrical line 110. The outer surface here refers to the cylindrical outer surface of the tube 110 at the respective end 110a, 110b. The inner surface here refers to the cylindrical inner surface of the tube 110 at the respective end 110a, 110b.

[0081] The second section 120b can be plate-shaped or form a small plate and have a bore 121 for mechanical and electrical contact. Via the bore 121, the small plate 120b can, for example, be screwed or clamped to a terminal of the storage medium or the battery, or, for example, attached to a corresponding battery terminal in the vehicle.

[0082] Fig. 2 shows a schematic representation of a welded connection arrangement 200 according to the invention, in which both ends 110a, 110b are contacted.

[0083] In contrast to the representation in Fig. 1, in which only one end 110a of the tubular electrical cable 110 is shown exploded, in Fig. 2 both ends 110a, 100b of the tubular electrical line 110 are shown in the assembled state.

[0084] That is, the welded connection arrangement 200 comprises a closure plug 130 at each end 110a, 110b, which is inserted into the tubular electrical line 110 there and is welded to the tubular electrical line 110 together with the electrically conductive contact part 120 in order to close the tubular electrical line 110 against the escape of coolant at both ends 110a, 110b.

[0085] Fig. 3 shows a schematic representation of a weld connection arrangement 300 according to the invention, in which the electrical contact part is formed as a friction welding tool.

[0086] The welded connection arrangement 300 can be the welded connection arrangement 100 or 200 as above to Fig. 1 and Fig. 2 with the difference that the electrical contact part 120 can be designed as a friction welding tool at least at one end 110a, 110b.

[0087] As described above, the electrically conductive contact part 120 may have a first portion 120a and a second portion 120b, wherein Fig. 3 only the first section 120a is shown in more detail, which are mechanically rigidly connected to each other.

[0088] The first section 120a of the electrically conductive contact part 120 can be formed as a rotationally symmetrical body, which can be shaped as a hollow body or a completely filled body. The rotationally symmetrical body can, for example, be constructed from a plurality of cylindrical sections that extend along a rotation axis (in the x-direction, see Fig. 2) are arranged as in Fig. 3 shown.

[0089] The first section 120a of the electrically conductive contact part 120 can be welded to the closure plug 130 on an inner surface of the tubular electrical line 110 at the respective end 110a, 110b of the tubular electrical line 110. For example, the closure plug 130 can be inserted into the tubular electrical line 110 at the respective end 110a, 110b and welded to the first section 120a of the electrically conductive contact part 120, which is also inserted into the tubular electrical line 110.

[0090] During the production of such a welded joint arrangement, the first section 120a of the electrically conductive contact part 120 can be inserted into a friction welding system as a friction welding tool, and a friction weld can be created using the friction welding system. After this friction weld has been created, the friction welding tool can be removed from the friction welding system and remain in the welded joint arrangement 300 as the electrically conductive contact part 120.

[0091] As already mentioned above, the first section 120a can be formed as a rotationally symmetrical friction welding tool.

[0092] The friction welding tool can, for example, be designed as a CCS (“Combined Charging System”) DC PIN.

[0093] The second section 120b can be a rotationally symmetrical body having a plug contact 122 for mechanical and electrical contacting. Such a plug contact 122 can, for example, be plugged into an electrical consumer, such as a charging socket, to enable electrical contact with the electrical consumer or the charging socket.

[0094] Fig. 4 shows a schematic representation of a welded connection arrangement 400 according to the invention with a cooling connection 140 on the pipe 110.

[0095] The welded connection arrangement 400 can be the welded connection arrangement 100 or 200 as above. Fig. 1 and Fig. 2 described.

[0096] Additionally, the tubular electrical conduit 110 may have one or more lateral bores for introducing or discharging coolant. A cooling port 140 may be mounted in the lateral bore to introduce or discharge the coolant into the tubular electrical conduit 110.

[0097] A screw with a seal can be screwed, welded or glued into the bore, which forms the cooling connection 140, onto which a coolant line can be plugged or attached in some other way.

[0098] With such a cooling connection 140, the coolant can circulate through the cooling connection 140 on the tube 110. As mentioned above for the Fig. 1 and Fig. 2, the sealing plug 130 or filling pin closes the frontal connection during friction welding, so that a subsequent bore for the cooling connection 140, as shown here in Fig. 4 shown, may be necessary.

[0099] Fig. 5 shows a schematic representation of a weld connection arrangement 500 according to the invention with a cooling connection pin.

[0100] The welded connection arrangement 500 can be the welded connection arrangement 100 or 200 as above to Fig. 1 and Fig. 2 described.

[0101] The closure plug 130 can have a cooling connection 140 or cooling connection pin to introduce the coolant into the tubular electrical line 110. The cooling connection 140 can be attached to the end face of the tube 110. The cooling connection 140 can be similar to the cooling connection 140 of Fig. 4. A coolant hose can be connected to the cooling connection pin 140 to allow cooling medium to circulate in the tube 110. The cooling connection pin can establish a materially bonded connection to the tube 110 and the contact part 120 and additionally encompass the cooling connection 140.

[0102] Fig. 6 shows a schematic representation of a weld connection arrangement 600 according to the invention with a terminal as a T-piece.

[0103] The welded connection arrangement 600 can be the welded connection arrangement 100 or 200 as above to Fig. 1 and Fig. 2 described.

[0104] In addition, the tubular electrical line 110 may have a T-shaped connector 150 with three tubular line connections 150a, 150b, 150c at at least one of the ends 110a, 110b.

[0105] A first line connection 150a of the three tubular line connections 150a, 150b, 150c can be designed as a coolant connection. A second line connection 150b of the three tubular line connections 150a, 150b, 150c can be welded to the electrically conductive contact part 120. A third line connection 150c of the three tubular line connections 150a, 150b, 150c can be welded to the tubular electrical line 110.

[0106] The terminal can be designed as a T-piece with or without a coolant hose connection. The terminal can be electrically and mechanically connected to the tubular electrical line 110, for example, via TIG welding (tungsten inert gas welding).

[0107] The invention further relates to a method for producing a welded connection arrangement 100, 200, 300, 400, 500, 600 for cooled power transmission from an electrical consumer, for example a charging socket, to a storage medium, for example a battery, for example a battery of an electrically operated vehicle, as described above for the Fig. 1 to 6. Such a procedure includes the following steps:

[0108] Providing a tubular electrical line 110 with a first end 110a for electrical connection to the electrical consumer, for example the charging socket, and a second end 110b for electrical connection to the storage medium, for example the battery, as described above for the Fig. 1 and Fig. 2, wherein the tubular electrical line 110 is designed to receive coolant.

[0109] Inserting a closure plug 130 at a respective end 110a, 110b of the tubular electrical line 110 into the tubular electrical line 110, as described above for the Fig. 1 and Fig. 2 is explained in more detail.

[0110] Attaching an electrically conductive contact part 120 to a respective end 110a, 110b of the tubular electrical line 110 for electrically contacting the tubular electrical line 110, such as described above for the Fig. 1 and Fig. 2 is explained in more detail.

[0111] Welding the sealing plug 130 together with the electrically conductive contact part 120 to the tubular electrical line 110 at the respective end 110a, 110b of the tubular electrical line 110 in order to seal the same against the escape of coolant, as described above for example in relation to Fig. 1 and Fig. 2 is explained in more detail.

[0112] The welding may comprise friction welding, in which the electrically conductive contact part 120 together with the closure plug 130 is friction welded to the tubular electrical line 110.

[0113] The method may further comprise the step of: attaching a cooling connection 140 to the tubular electrical conduit 110 and introducing or discharging coolant into or out of the tubular electrical conduit via the cooling connection 140, for example as described above for the Fig. 4 and Fig. 5 is explained in more detail. LIST OF REFERENCE SYMBOLS 100, 200, 300 400, 500, 600 Welded joint arrangement for cooled power transmission 110 tubular electrical cable 110a first end of the tubular electrical cable 110b second end of the tubular electrical cable 120 electrically conductive contact part 120a first section of the electrically conductive contact part 120b second section of the electrically conductive contact part 121 Hole on the second section of the electrically conductive contact part 122 Plug contact on the second section of the electrically conductive contact part 130 plug or refill pin 140 cooling connection 150 T-shaped connector of the tubular electrical cable 150a first line connection on the T-shaped connector 150b second line connection on the T-shaped connector 150c third line connection on the T-shaped connector

Claims

[1] Welded connection arrangement (100, 200, 300, 400, 500, 600) for cooled power transmission from an electrical consumer to a storage medium, the welded connection arrangement (100) comprising: a tubular electrical line (110) configured to conduct current, the tubular electrical line (110) comprising a first end (110a) for electrical connection to an electrical load and a second end (110b) for electrical connection to a storage medium, and further configured to receive a coolant for cooling the tubular electrical line (110); an electrically conductive contact member (120) attached to a respective end (110a, 110b) of the tubular electrical conduit (110) for electrically contacting the tubular electrical conduit (110); and a closure plug (130) which is inserted into the tubular electrical line (110) at the respective end (110a, 110b) of the tubular electrical line (110) and is welded to the tubular electrical line (110) together with the electrically conductive contact part (120) in order to close the tubular electrical line (110) against the escape of coolant; wherein the electrically conductive contact part (120) is welded to the tubular electrical line (110) by means of the sealing plug (130) and thus hermetically seals the tubular electrical line (110) against coolant leakage. [2] Welded connection arrangement (100, 200, 300, 400, 500, 600) according to claim 1, which forms a friction welded connection arrangement in which the electrically conductive contact part (120) together with the closure plug (130) is friction welded to the tubular electrical line (110). [3] Welded connection arrangement (100, 200, 300, 400, 500, 600) according to claim 1 or 2, wherein the electrically conductive contact part (120) and the tubular electrical line (110) consist of different metals which are welded together. [4] Welded connection arrangement (100, 200, 300, 400, 500, 600) according to one of the preceding claims, wherein the tubular electrical line (110) and the closure plug (130) are made of aluminum and the electrically conductive contact part (120) is a copper part which is welded together with the aluminum of the tubular line (110) and the aluminum of the closure plug (130). [5] Welded joint arrangement (100, 200, 300, 400, 500, 600) according to one of the preceding claims, wherein the electrically conductive contact part (120) has a first portion (120a) and a second portion (120b) which are mechanically rigidly connected to one another; wherein the first portion (120a) is tubular and is welded to the respective end of the tubular electrical line (110). [6] Welded joint arrangement (100, 200, 400, 500, 600) according to claim 5, wherein the first portion (120a) is a tubular hollow body which is welded to an outer surface of the tubular electrical line (110) at the respective end (110a, 110b) of the tubular electrical line (110); and wherein the closure plug (130) is attached to the respective end (110a, 110b) in the tubular electrical conduit (110) and is welded to an inner surface of the tubular electrical conduit (110). [7] Welded connection arrangement (100, 200, 400, 500, 600) according to claim 5 or 6, wherein the second portion (120b) is plate-shaped and has a bore (121) for mechanical and electrical contacting. [8] Welded connection arrangement (300) according to claim 5, wherein the first portion (120a) is a rotationally symmetrical body which is welded at the respective end (110a, 110b) of the tubular electrical conduit to the closure plug (130) on an inner surface of the tubular electrical conduit (110). [9] Welded joint arrangement (300) according to claim 5 or 8, wherein the first portion (120a) is formed as a rotationally symmetrical friction welding tool. [10] Welded connection arrangement (300) according to one of claims 5, 8 and 9, wherein the second portion (120b) is a rotationally symmetrical body having a plug contact (122) for mechanical and electrical contacting. [11] Welded connection arrangement (400) according to one of the preceding claims, wherein the tubular electrical line (110) has at least one lateral bore for introducing coolant; wherein a cooling port (140) is mounted in the lateral bore for introducing or discharging the coolant into or from the tubular electrical conduit (110). [12] Welded joint assembly (500) according to any one of the preceding claims, wherein the closure plug (130) has a cooling port (140) for introducing the coolant into the tubular electrical conduit (110). [13] Welded connection arrangement (600) according to one of the preceding claims, wherein the tubular electrical line (110) has a T-shaped connector (150) with three tubular line connections (150a, 150b, 150c) at at least one of the ends (110a, 110b). [14] Welded joint arrangement (600) according to claim 13, wherein a first line connection (150a) of the three tubular line connections (150a, 150b, 150c) is designed as a coolant connection, wherein a second lead terminal (150b) of the three tubular lead terminals (150a, 150b, 150c) is welded to the electrically conductive contact part (120); and wherein a third lead terminal (150c) of the three tubular lead terminals (150a, 150b, 150c) is welded to the tubular electrical line (110). [15] Method for producing a welded connection arrangement (100, 200, 300, 400, 500, 600) for cooled power transmission from an electrical consumer to a storage medium, the method comprising the following steps: Providing a tubular electrical line (110) having a first end (110a) for electrical connection to an electrical consumer and a second end (110b) for electrical connection to a storage medium, wherein the tubular electrical line (110) is designed to receive coolant; Inserting a closure plug (130) into the tubular electrical conduit (110) at a respective end (110a, 110b) of the tubular electrical conduit (110); Attaching an electrically conductive contact part (120) to a respective end (110a, 110b) of the tubular electrical line (110) for electrically contacting the tubular electrical line (110); and Welding the sealing plug (130) together with the electrically conductive contact part (120) to the tubular electrical line (110) at the respective end (110a, 110b) of the tubular electrical line (110) in order to seal the same against the escape of coolant, wherein the electrically conductive contact part (120) is welded to the tubular electrical line (110) by means of the sealing plug (130) and thus hermetically seals the tubular electrical line (110) against coolant leakage. [16] The method of claim 15, wherein the welding comprises friction welding, in which the electrically conductive contact part (120) together with the closure plug (130) is friction welded to the tubular electrical line (110). [17] The method of claim 15 or 16, further comprising: Attaching a cooling connection (140) to the tubular electrical line (110) and introducing or discharging coolant into or out of the tubular electrical line via the cooling connection (140).

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