Apparatus for establishing an electrically conductive connection

Abstract

An apparatus (2) for establishing an electrically conductive connection is disclosed. The apparatus (2) comprises at least one first electrical conductor element (4), which has a first contact pole (4). In addition, the apparatus (2) comprises at least one second electrical conductor element (6), which has a second contact pole (6). The at least one first electrical conductor element (4) is surrounded in at least some areas by a first electrically insulating casing element (8), by means of which the first contact pole (4) of the at least one first conductor element (4) is accommodated and/or held. The at least one second electrical conductor element (6) is also surrounded in at least some areas by a second electrically insulating casing element (12), by means of which the second contact pole (6) of the at least one second conductor element (6) is accommodated and/or held. The second electrically insulating casing element (12) has a second recess (14) in the area of the second contact pole (6) of the at least one second electrical conductor element (6). The apparatus also comprises at least one securing means (26), which can be guided through the first recess (10) and the second recess (14), or which at least partially surrounds the first recess (10) and the second recess (14) at the side, to releasably couple the first electrically insulating casing element (8) and the second electrically insulating casing element (12) to one another in order to establish an electrical connection between the first contact pole (4) of the at least one first conductor element (4) and the second contact pole (6) of the at least one second conductor element (6).

Claims

1. An electrical apparatus for establishing an electrically conductive connection, comprising: a first electrical conductor element, having a first contact pole, a second electrical conductor element, having a second contact pole, a first electrically insulating casing element, the first electrically insulating casing element has a C-shaped cross section that includes a first recess defined between a first upper portion and a first lower portion, the first electrical conductor element is located in the first lower portion of the first recess, a second electrically insulating casing element, the second electrically insulating casing element has a second recess defined between a second upper portion and a second lower portion, the second electrical conductor element is located in the second upper portion of the second recess, and a securing means that is guided through both of the first recess and the second recess to releasably couple the first electrically insulating casing element and the second electrically insulating casing element to one another.

2. The electrical apparatus according to claim 1, wherein the first lower portion of the first electrically insulating casing element is received into the second recess in the second electrically insulating casing element, and the second upper portion of the second electrically insulating casing element is received into the first recess in the first electrically insulating casing element.

3. The electrical apparatus according to claim 1, wherein the first upper portion of the first electrically insulating casing element has a first upper aperture, and the first electrical conductor element has a first conductor aperture, wherein the first upper aperture and the first conductor aperture are aligned with one another.

4. The electrical apparatus according to claim 3, wherein the first electrical conductor and/or the first lower portion of the first electrically insulating casing element comprises a first locking recess, and wherein the securing means comprises a pin configured to engage the first locking recess.

5. The electrical apparatus according to claim 4, wherein the first locking recess is centered about an axis that is different than an axis about which the first upper aperture is centered about.

6. The electrical apparatus according to claim 4, wherein the second electrical conductor and/or the second lower portion of the second electrically insulating casing element comprises a second locking recess, and wherein the securing means comprises a pin configured to engage the second locking recess.

7. The electrical apparatus according to claim 2, wherein the first lower portion of the first electrically insulating casing element has a first lower aperture that is aligned with the first upper aperture and the first conductor aperture.

8. The electrical apparatus according to claim 7, wherein, the second upper portion comprises a second upper aperture, wherein the first upper aperture, the first conductor aperture, the first lower aperture, the second upper aperture, and the second conductor aperture are aligned with one another in a coupled position of the first electrically insulating casing element and of the second electrically insulating casing element.

9. The electrical apparatus according to claim 8, wherein, the second lower portion comprises a second lower aperture, wherein the first upper aperture, the first conductor aperture, the first lower aperture, the second upper aperture, the second conductor aperture, and the second lower aperture are aligned with one another in a coupled position of the first electrically insulating casing element and of the second electrically insulating casing element.

10. The electrical apparatus according to claim 3, wherein the second upper portion of the second electrically insulating casing element has a second upper aperture, and the second electrical conductor element has a second conductor aperture, wherein the second upper aperture and the second conductor aperture are aligned with one another.

11. The electrical apparatus according to claim 10, wherein the first upper aperture in the first electrically insulating casing element, the first conductor aperture in the first electrical conductor element, the second upper aperture in the second electrically insulating casing element, and the second conductor aperture in the second electrical conductor element are aligned with one another in a coupled position of the first electrically insulating casing element and of the second electrically insulating casing element.

12. The electrical apparatus according to claim 10, wherein the securing means can be passed at least partially through the first upper aperture, the first conductor aperture, the second upper aperture, and the second conductor aperture.

13. The electrical apparatus according to claim 12, wherein the securing means is a plug element having a pin, which can be passed at least partially through the first upper aperture, the first conductor aperture, the second upper aperture, and the second conductor aperture.

14. The electrical apparatus according to claim 13, wherein the plug element has a locking device that includes a hook or a cross-pin, which can engage, catch and/or be snapped with a recess or an undercut defined in an area of the first conductor aperture in the first electrical conductor element and/or in an area of a first lower aperture defined in the lower portion of the first electrically insulating casing element.

15. The electrical apparatus according to claim 14, wherein the locking device is a bayonet closure.

16. The electrical apparatus according to claim 14, wherein the plug element has a tension element configured to apply tension on the first contact pole of the first electrical conductor element and on the second contact pole of the second electrical conductor element.

17. An electrical assembly comprising: the electrical apparatus according to claim 1, a plate electrically connected to the second electrical conductor, and a battery comprising a terminal, wherein the plate is configured to be electrically connected to the terminal of a battery.

18. An electrical apparatus for establishing an electrically conductive connection, comprising: a first electrical conductor element, having a first contact pole, a second electrical conductor element, having a second contact pole, a first electrically insulating casing element, the first electrically insulating casing element has a C-shaped cross section that includes a first recess defined between a first uDDer portion and a first lower portion, the first electrical conductor element is located in the first lower portion of the first recess, a second electrically insulating casing element, the second electrically insulating casing element has a second recess defined between a second upper portion and a second lower portion, the second electrical conductor element is located in the second upper portion of the second recess, and a securing means that at least partially surrounds the first recess and the second recess to releasably couple the first electrically insulating casing element and the second electrically insulating casing element to one another, the securing means having a C-shape.

19. The electrical apparatus according to claim 18, wherein the securing means is a clamp element, which completely covers at least one side face in some areas in a vertical direction in coupling of the first insulating casing element and the second insulating casing element and clamp ends of the clamp element rest on the surface of the first upper portion of the first insulating casing element and on the surface of the second lower portion of the second insulating casing element.

20. The electrical apparatus according to claim 18, wherein the securing means comprise clamp ends having tension elements.

Description

(1) Embodiments of the invention and the advantages thereof are explained in greater detail below on the basis of the accompanying figures. The size ratios of the individual elements to one another in the figures do not always correspond to the real size ratios because some shapes have been simplified and other shapes are illustrated in enlarged diagrams in relation to the other elements for the sake of better illustration.

(2) FIG. 1 shows a schematic view of one embodiment of an apparatus according to the invention for connecting at least one first electrical conductor element and one second electrical conductor element;

(3) FIG. 2 shows a schematic view of one embodiment of a coupled first conductor element and second electrical conductor element;

(4) FIG. 3 shows a schematic detailed view of one embodiment of the apparatus according to the invention;

(5) FIGS. 4a and 4b each show a schematic view of a plug element such as that which can be provided with various embodiments of an apparatus according to the invention;

(6) FIG. 5 shows another embodiment of an apparatus according to the invention for connecting at least one first electrical conductor element and one second electrical conductor element;

(7) FIGS. 6a and 6b each show a schematic view of a conductor element configuration, such as that which may be provided with various embodiments of an apparatus according to the invention;

(8) FIG. 7 shows a schematic view of a preferred application variant of the apparatus according to the invention.

(9) For the same elements or those having the same effect as those according to the invention, identical reference numerals are used. Furthermore, for the sake of simplicity, reference numerals are shown in the individual figures only when they are necessary for the description of the respective figure. The embodiments illustrated represent only examples of how the apparatus according to the invention may be designed and they do not constitute a conclusive delineation.

(10) FIG. 1 shows a preferred embodiment variant of an apparatus 2 according to the invention for establishing an electrically conductive connection between at least one first electrical conductor element 4 and at least one second electrical conductor element 6. The apparatus 2 preferably comprises a first electrical conductor element 4 and a second electrical conductor element 6. The first electrical conductor element 4 has a first contact pole 4, and the second electrical conductor element 6 has a second contact pole 6. The first contact pole 4 of the first electrical conductor element 4 and the second contact pole 6 of the second electrical conductor element 6 may be brought into electrically conductive contact. To do so the first component 4 of the first electrical conductor element 4 has a first contact face 4, and the second contact pole 6 of the second electrical conductor element 6 has a second contact face 6. For example, the first electrical conductor element 4 and the second electrical conductor element 6 may each be designed as a metal plate or sheet metal which is designed to be flat in the area of the first contact pole 4 and/or the second contact pole 6, but profiling 6 of the metal plate or of the sheet metal of the first contact pole 4 and of the second contact pole 6 is also conceivable, as shown in FIGS. 6a and b.

(11) The first electrical conductor element 4 is accommodated by a first electrically insulating casing element 8 and/or is held by a first electrically insulating casing element 8. In the area of the first contact pole 4, in particular in the area of the first contact face 4, however, the first casing element 8 has a first recess 10. An upper portion 8 and a lower portion 8 of the first electrically insulating casing element 8 may be formed by the first recess 10 of the first electrically insulating casing element 8. The first recess 10 is designed so that the first electrical conductor element 4 is partially surrounded by the lower portion 8 of the first electrically insulating casing element 8, and the first contact pole 4 and/or the first contact face 4 of the first electrical conductor element 4 is partially exposed.

(12) The second conductor element 6 is also partially accommodated by a second electrically insulating casing element 12 and/or is held by a second electrically insulating casing element 12 which has a second recess 14 in the area of the second contact pole 6, in particular in the area of the second contact face 6. An upper portion 12 and a lower portion 12 of the second electrically insulating casing element 12 are formed by the second recess 14 in the second electrically insulating casing element 12. The second recess 14 is also designed so that the second electrical conductor element 6 is partially surrounded by the upper portion 12 of the second electrically insulating casing element 12, and the second contact pole 6 and/or the second contact face 6 of the second electrical conductor element 6 is/are partially exposed.

(13) The first recess 10 and the second electrically insulating casing element 12 are designed so that the upper portion 12 of the second electrically insulating casing element 12 can accommodated in the first recess. Likewise the second recess 14 and the first electrically insulating casing element 8 are designed so that the lower portion 8 of the first electrically insulating casing element 8 can be accommodated in the second recess 14. The first recess 10 and the upper portion 12 of the second electrically insulating casing element 12 are preferably designed so that they correspond to one another such that the upper portion 12 of the second electrically insulating casing element 12 can be accommodated with an accurate fit in the first recess 10. Likewise the second recess 14 and the lower portion 8 of the first electrically insulating casing element 8 are designed so that they correspond to one another such that the lower portion 8 of the first electrically insulating casing element 8 can be accommodated with an accurate fit in the second recess 14. In this way the first electrically insulating casing element 8 and the second electrically insulating casing element 12 can be pushed into one another (cf. arrow 30), so that the first contact pole 4 of the first electrical conductor element 4 and the second contact pole 6 of the second electrical conductor element 6 are in electrically conducting contact in the area of the first contact face 4 and the second contact face 6.

(14) In addition, the first electrically insulating casing element 8 has a first circular recess 16 in the upper portion 8, and the first conductor element 4 has a second circular recess 18. The first circular recess 16 penetrates completely through an upper portion 8 of the first electrically insulating casing element 8. The second circular recess 18 in the first electrical conductor element 4 can also penetrate through it completely. It is appropriate here if the lower portion 8 of the first electrically insulating casing element 8 also has a third circular recess 20. The third circular recess 20 may penetrate completely or just partially through the lower portion 8. In addition, it is conceivable for the second circular recess 18 not to completely penetrate the first electrical conductor element 4. A third circular recess 20 is not necessary here. The circular recesses 16, 18 and 20 are each arranged so that they are aligned with one another.

(15) The second electrically insulating casing element 12 has a fourth circular recess 22 which completely penetrates the upper portion 12 of the second electrically insulating casing element 12. The second electrical conductor element 6 also comprises a fifth circular recess 24 which preferably penetrates completely through the second electrical conductor element 6. The circular recesses 22 and 24 are each arranged, so that they are aligned with one another. Another circular recess may optionally also be provided in the lower portion 12 of the second electrically insulating casing element 12. On the whole, the circular recesses 16, 18 and 20 and/or 22 and 24 are arranged in such a way that the circular recesses 16, 18, 20, 22 and 24 are aligned with one another when the upper portion 12 of the second electrically insulating casing element 12 is preferably accommodated completely in the first recess 10 and/or when the lower portion 8 of the first electrically insulating casing element 8 is preferably accommodated completely in the second recess 14.

(16) To be able to brace the first casing element 8 with the first electrical conductor element 4 and the second casing element 12 with the second electrical conductor element 6 and/or the first contact pole 4 of the first electrical conductor element 4 and the second contact pole 6 of the second electrical conductor element 6 to one another, a securing means 26 is provided. The securing means 26 is guided through the first recess 10 in the first electrically insulating casing element 8 and the second recess 14 in the second electrically insulating casing element 12 in order to releasably couple the first electrically insulating casing element 8 and the second electrically insulating casing element 12 to one another to establish an electrical connection between the first contact pole 4 and the second contact pole 6.

(17) To do so, the securing means 26 is introduced into the circular recesses 16, 18, 20, 22 and 24, as illustrated by the arrow 32. The securing means 26 is designed as a plug element 28. The plug element 28 has a pin 40. The pin 40 has certain dimensions so that it can preferably extend at least into the area of the second circular recess 18.

(18) The plug element 28 and/or the pin 40 can be locked by means of a rotational movement. To facilitate the rotational movement, the plug element 28 has a screw head 38. The material of the screw head 38 is an electrically insulating material. Furthermore, an additional insulation layer 58 is provided on the screw head 38 as shown in FIG. 4a in particular. The plug element 28 and/or the pin 40 can be locked in place by rotation of the screw head 38 and/or the plug element 28 by 90, 180 or 360 about the longitudinal axis of the pin 40. In particular, it is provided here that the plug element 28 cannot be moved and/or displaced further in the axial direction because of being locked after the plug element 28 and/or the pin 40 has been rotated. To be able to release the tension of the contact poles 4 and 6, it is necessary to rotate the screw head 38 and/or the plug element 28 in the opposite direction. Rotation in the opposite direction is possible here only with a certain application of force such as a certain torque, which is at least 50% greater or even 100% greater than the torque required for rotation in the unlocked condition.

(19) In addition, the pin 40 has a locking device, for example, in the form of a hook 44 or a cross-pin 44 inserted at a right angle through the pin 40. The hook 44 is introduced into a recess 42 or an undercut which may be arranged in the area of the third circular recess 20, but preferably in the area of the second circular recess 18. The recess 42 and/or the undercut may also extend from the second circular recess 18 to the third circular recess 20. By rotation of the plug element 28 and/or the pin 40, the hook 44 engages in the recess 42 so that the plug element 28 and/or the pin 40 can reach its locking position and an axial displacement of the plug element 28 and/or the pin 40 is prevented. To do so, the recess 42 may also have a hook-shaped groove into which the hook 44 and/or the cross-pin 44 can engage. Alternatively or additionally, it is possible to provide that the pin 40 has a recess in which a locking device of a locking component can be accommodated. The recess 42 may have a curved shape. The recess 42 is preferably provided in at least some areas with an angle of pitch, which winds around the longitudinal axis of the plug element 28 and/or the pin 40. In this way, the plug element 28 and/or the pin 40 can be forced to move in the axial direction by relative rotation of the plug element 28 and/or the pin 40 around the longitudinal axis. For example, a contact pressure, which may amount to at least 1 N/m.sup.2, at least 10 N/m.sup.2 or at least 100 N/m.sup.2, can be generated between the first contact face 4 of the first contact pole 4 and the second contact face 6 of the second contact pole 6 by means of rotation by an angle of max. 360. A so-called bayonet closure 56 may be formed in this way, said bayonet closure 56 optionally being used to implement a connection of the securing means 26 and the first casing element 8 and/or the first conductor element 4 that can be established rapidly and/or released rapidly.

(20) To secure the first conductor element 4 and the second conductor element 6 and/or the first contact pole 4 and the second contact pole 6 and/or to be able to brace them further with one another, the plug element 28 and/or the pin 40 also has an additional tension element 34. By means of the tension element 34, it is possible to ensure that the first contact face 4 of the first contact pole 4 and the second contact face 6 of the second contact pole 6 are pressed against one another in at least some areas, so as to result in a secured electrically conductive connection. The tension element 34 may be designed in the form of a spring element 36, for example. The spring element 36 may be a plate spring, for example, which is preferably arranged in an area beneath the screw head 38. The spring element 36 here is stretched as soon as the spring element 36 is in contact with the first electrically insulating casing element 8, and the locking device 44, 44 engages in the recess 42 and/or the undercut due to a rotational movement of the plug element 28 and/or the pin 40.

(21) FIG. 2 shows a detailed view of contact poles 4 and 6 of the conductor elements 4 and 6 that are coupled together and/or casing elements 8 and 12 that are coupled together in an embodiment of the apparatus 2 according to the invention according to the invention. It can be seen here clearly how the lower portion 8 of the first electrically insulating casing element 8 is accommodated in the second recess 14 in the second electrically insulating casing element 12 and/or how the upper portion 12 of the second electrically insulating casing element 12 is accommodated in the first recess 10 in the first electrically insulating casing element 8. As already described, the first electrical conductor element 4 is arranged in the lower portion 8 of the first electrically insulating casing element 8 so that the first contact face 4 of the first contact pole 4 is exposed through the recess 10 (cf. FIG. 1). The second electrical conductor element 6 is also arranged in the upper portion 12 of the second electrically insulating casing element 12 such that the second contact face 6 of the second contact pole 6 is exposed. The first electrical conductor element 4 protrudes to a certain extent out of the lower portion 8 of the first electrically insulating casing element 8 so as to result in a distance 8b between the material 8a of the first electrically insulating casing element 8 and the second contact face 6 of the second electrical conductor element 6. The situation may also be similar for the second electrically insulating casing element 12 so that a distance 12b results between the material 12a of the second electrically insulating casing element 12 and the first contact face 4 of the first electrical conductor element 4. In this way it is possible to ensure that the first contact pole 4 and the second contact pole 6 are securely in contact with one another in the areas of the first contact face 4 and of the second contact face 6, so that a constant electrical connection can be maintained. This prevents such a disturbance in the electrically conducting connection because of protruding material 8a and/or 12a of the electrically insulating casing elements 8 and 12.

(22) FIG. 3 shows a detailed view of a locking device in the form of a bayonet closure 56 for the securing means 26. A portion of the first electrically insulating casing element 8 is illustrated here. The first conductor element 4 is accommodated by the first electrically insulating casing element 8. The hook 44 and/or the cross-pin 44 can pass partially through the third circular recess 20 and can be inserted into the recess 42 which is designed with a curve by rotation of the plug element 28 and/or the screw head 38. The pin 40 of the plug element 28 has a dimension such that the hook 44 and/or the cross-pin 44 which is preferably arranged in an end area of the pin 40 may extend into the third circular recess 20 of the lower portion 8 of the first electrically insulating casing element 8 and thus passes through the first circular recess 16 of the first electrically insulating casing element 8 as well as the second circular recess 18 in the first electrical conductor element 4. The second circular recess 18 and the third circular recess 20 may have the same or different diameters.

(23) FIG. 4a illustrates a securing means 26 according to the invention. The securing means 26 is designed as a plug element 28, which has a pin 40. A screw head 38 is arranged at the upper end 40 of the pin 40 in order to simplify a rotational movement of the plug element 28 and/or of the pin 40. In addition, the screw head 38 has an additional insulation layer 58. An arrow symbol 46 is shown in the screw head 38 and/or in the insulation layer 58, as shown in FIG. 4b. The arrow symbol 46 provides an orientation aid to facilitate assembly of the securing element 26. Thus, for example, positioning arrows 46 or the inscription open and/or closed 62, for example, may be illustrated on the surface of the first casing element 8, identifying a sufficient or necessary rotational movement for securing the plug element 28. At the same time, a notch 60 is created in the surface of the insulation layer 58 by means of an arrow symbol 46, which is created with depth. A point of application for an aid for rotation of the plug element 28 such as a point of application for a screwdriver is formed by the notch 60.

(24) In addition, the plug element 28 also has a cross-pin 44 passing through the pin 40 at a right angle in the area of the lower end 40 of the pin 40. Alternatively instead of the cross-pin 44, a hook 44 may also be provided. The cross-pin 44 engages in the recess 42 on rotation of the plug element 28, said recess preferably being provided with an angle of pitch in at least some areas. To further tighten the first and second electrical conductor elements 4, 6 and/or the first and second contact poles 4, 6, a tension element 34 is arranged in the area of the upper end 40 of the plug element 28 and/or of the pin 40, but beneath the screw head 38. The tension element 34 is preferably a plate spring 36. As soon as the plug element 28 has been rotated into the recess 42 by a rotational movement due to an action involving the cross-pin 44, tightening of the plate spring 36, which then rests on the surface of the first casing element 8, may then take place. With another rotational movement of the plug element 28 and/or of the pin 40, the plate spring 39 is additionally braced.

(25) Another embodiment variant of the apparatus according to the invention for connecting at least one first electrical conductor element 4 and one second electrical conductor element 6 is illustrated in FIG. 5. The apparatus 2 here also comprises a first electrical conductor element 4 and a second electrical conductor element 6. The first electrical conductor element 4 has a first contact pole 4, and the second electrical conductor element 6 has a second contact pole 6. The first contact pole 4 of the first electrical conductor element 4 and the second contact pole 6 of the second electrical conductor element 6 should be brought into electrical contact with one another at the first contact face 4 and the second contact face 6.

(26) As in the embodiment variant in FIG. 1, here again, the first casing element 8 and the second casing element 12 can be pushed into one another because of the first and second recesses 10 and 14, so that an electrically conductive connection can be established as the first and second contact faces 4 and 6 of the first and second electrical conductor elements 4 and 6. To be able to brace the first and second casing elements 8 and 12 and/or the first and second contact faces 4 and 6 together, a securing means 26 is required. The securing means 26 here is designed as a clamp element 66 having approximately a U shape. In coupling the first insulating casing element 8 and the second insulating casing element 12, the clamp element 66 covers at least one side face 70 completely in some areas in the vertical direction. Clamp ends 68 of the clamp element 66 may be in contact with the surface of the other portion 8 of the first insulating casing element 8 and the surface of the lower portion 12 of the second insulating casing element 12, so that the first and second contact faces 4 and 6 can be pressed against one another. To improve the pressing, the clamp ends 68 may additionally be equipped with tension elements 36.

(27) FIGS. 6a and 6b each show differently designed profilings 64 of the respective contact faces 4 and 6 of the first contact pole 4 and the second contact pole 6. In particular tooth-shaped profilings 64 have proven to be especially advantageous. The profiling 64 in FIG. 6a has a few teeth 64 but the profiling in FIG. 6b has a greater number of teeth. The teeth 64 of the tooth-shaped profiling 64 of the first contact face 4 are designed so that they can mesh with the teeth 64 of the tooth-shaped profiling 64 of the second contact face 6. An increase in surface area of the first and second contact poles 4, 6 is possible due to the tooth-shaped profiling 64, so that a large current transfer area can be formed as well as a sufficient cooling surface for dissipation of heat. The connection of the contact poles 4, 6 can also be stabilized mechanically.

(28) FIG. 7 shows a preferred application variant of the apparatus 2 according to the invention. The apparatus 2 is used as a so-called high-power connector 2. The second electrically insulating casing element 12 and/or the second electrical conductor element 6 can be attached to an aluminum plate 50 by means of a copper strip 48. The aluminum sheet 50 can be coupled to a cell terminal 54 of a battery element, for example, in the form of a lithium cell 52. This provides a simple connection of the high-power connector 2 to a lithium cell 52, so that said high-power connector 2 can establish an electrical connection of the lithium cell 52 to a current source.

LIST OF REFERENCE NUMERALS

(29) 2 apparatus for establishing an electrically conductive connection 2 high-power connector 4 first electrical conductor element 4 first contact pole 4 first contact face 6 second electrical conductor element 6 second contact pole 6 second contact face 8 first electrically insulating casing element 8 lower portion of the first casing element 8 upper portion of the first casing element 8a material of the first electrically insulating casing element 8b distance between the material of the first electrically insulating casing element and the second contact face of the second electrical conductor element 10 first recess 12 second electrically insulating casing element 12 upper portion of the second casing element 12 lower portion of the second casing element 12a material of the second electrically insulating casing element 12b distance between the material of the second electrically insulating casing element and the first contact face of the first electrical conductor element 14 second recess 16 first circular recess 18 second circular recess 20 third circular recess 22 fourth circular recess 24 fifth circular recess 26 securing means 28 plug element 30 arrow 32 arrow 34 tension elements 36 spring element, plate spring 38 screw head 40 pin 40 upper end of the pin 40 lower end of the pin 42 recess 44 hook 44 cross-pin 46 arrow symbol 46 positioning arrows 48 copper strip 50 aluminum sheet 52 lithium cell 54 cell terminal 56 bayonet closure 58 insulation layer 60 notch 62 writing 64 profiling 64 teeth 66 clamp element 68 spring clamp ends 70 side face