Adapter for fastening to energy storage device, energy storage device, connection unit, and system for connecting energy storage devices

Abstract

The present invention relates to an adapter (30), which is fixed to an energy accumulator (20) of a micromobility vehicle and connects the energy accumulator (20) to a connection unit. The adapter (30) comprises a fixing part (40) and a connecting part (48). The fixing part (40) is designed to be fixable in a socket of the energy accumulator (20). The connecting part (48) comprises a connecting structure (50). The connecting structure (50) is designed to form a cam mechanism with a lever (11) of the connection unit, converting the engagement of this lever (11) by pivoting into the connecting structure (50) into a displacement transverse to the pivot direction of this lever (11). The present invention also relates to an energy accumulator (20), a connection unit (56) and a system for connecting energy accumulators.

Description

[Technical field]

[0001] The invention relates to an adapter for fastening to an energy accumulator, to an energy accumulator, to a connection unit and to a system for connecting the energy accumulator to the connection unit. [Background technology]

[0002] Batteries play a special role in micromobility vehicles, such as e-bikes, cargo bikes, e-tricycles, etc., on the one hand with respect to the range that the vehicle can achieve, and on the other hand with respect to the weight. That is to say, the weight of the battery plays a special role, since an increase in weight leads, on the one hand, to a decrease in the range, and, on the other hand, since the battery or energy store cannot have a large capacity unless it is correspondingly large and therefore heavy. However, in some cases, it may be desirable to use a smaller energy store, since a long range is not necessary and the advantages of a lighter weight take precedence. In particular, a lighter weight improves the maneuverability of the two-wheeler and, as a result, the ease of use for the user. Summary of the Invention [Problem to be solved by the invention]

[0003] Against this background, the challenge is to reduce the weight of micromobility vehicles and to enable the use of smaller energy storage devices. [Means for solving the problem]

[0004] According to a first aspect, the invention relates to an adapter, which is fixed to an energy accumulator of a micromobility vehicle and connects the energy accumulator to a coupling unit. The adapter comprises a fixing part and a coupling part. The fixing part is designed to be fixable in a socket of the energy accumulator. The coupling part comprises a coupling structure. The coupling structure is designed to form a cam mechanism with a lever of the coupling unit to convert an engagement of this lever by pivoting into the coupling structure into a displacement transverse to the pivoting direction of this lever.

[0005] According to a further aspect, the invention relates to an energy accumulator for supplying energy to a micromobility vehicle. The energy accumulator comprises an end face with an electric plug connector for connection with a docking unit and a coupling profile arranged in the upper region of the energy accumulator, the coupling profile having a coupling cam with an engagement surface. The coupling profile is designed in such a way that a lever of the docking unit engaging with the docking profile abuts on the engagement surface and a pivoting movement of the lever is converted into a displacement of the energy accumulator perpendicular to the end face. The coupling profile is designed in such a way that an adapter for adapting the energy accumulator for connection to a normal docking unit for a higher height normal energy accumulator can be removably fixed to the docking profile.

[0006] According to a further aspect, the invention relates to a connection unit for connecting and fastening an energy accumulator. The connection unit comprises a connection side with an electrical plug-in interface for connecting with a plug connector on the end face of the energy accumulator and a terminal panel with a terminal interface for connecting a terminal connector of an electrical component. The plug-in interface and the terminal interface are electrically connected to each other. The connection unit also comprises an operating lever which is pivotable about a rotation axis and has an engagement lever. The engagement lever is designed to engage with a connection profile of the energy accumulator. The rotation axis is oriented perpendicular to the normal of the connection side, the engagement lever cooperating with the connection profile of the energy accumulator. As a result, a pivoting movement of the engagement lever is converted into a translational movement of the energy accumulator parallel to the normal of the connection side.

[0007] According to another aspect, the invention relates to a system for coupling an energy accumulator to a coupling unit and for connecting the energy accumulator to the coupling unit. The system comprises an energy accumulator, a conventional coupling unit and an adapter. The energy accumulator has an end face on which an electrical plug connector is arranged. The conventional coupling unit has a coupling side on which a plug-in interface that can be connected to the plug connector is arranged. The adapter has a fastening part and a coupling part with a coupling structure. The height of the end face of the energy accumulator is lower than the height of the coupling side of the conventional coupling unit. The energy accumulator comprises a coupling profile arranged in its upper region. A lever of a compatible (small) coupling unit can engage with the coupling profile. The coupling profile is formed from a coupling cam with a recess and an engagement surface. The coupling profile is designed to receive the fastening part of the adapter. The adapter comprises a coupling structure with a coupling surface and a curved surface. With its fastening part, the adapter is removably fixed to the energy accumulator. The conventional coupling unit comprises a lever that engages with the coupling structure of the adapter when pivoted. As a result, the pivoting movement is converted into a translational movement of the energy accumulator, which is moved in the direction of the normal coupling unit. The lever engages with the coupling surface of the adapter and is guided over the curved surface of the adapter.

[0008] Preferred embodiments of the invention are set forth in the dependent claims. It is to be understood that the features mentioned above and those described below can be used not only in the combinations mentioned in each case, but also in other combinations or alone, without departing from the scope of the invention.

[0009] The adapter according to the invention allows modifying a smaller battery with a lower construction height to use it in a "normal" coupling unit intended for a battery with a higher construction height. In this way, it is possible to replace an existing normal energy store in an existing micromobility vehicle, such as an electric bicycle, a fast pedelec, a pedelec, a cargo bike, etc., and to replace it with a small energy store with a lower construction height and correspondingly lower weight. The adapter therefore offers high flexibility in the selection of the storage battery to be used. It has proven advantageous to design the adapter so that it can be inserted into the coupling profile of the energy store, which is normally used for coupling and fixing the energy store to a compatible coupling unit of the micromobility vehicle.

[0010] The connecting part of the adapter has a connecting structure suitable for forming a cam mechanism with the connecting unit, so that the lever connecting the battery to the connecting unit can convert its pivoting movement into a lateral displacement with respect to the connecting unit. In this way, with the adapter according to the invention, a battery thus equipped or an energy accumulator thus equipped can be pulled towards the connecting unit. A secure and permanent fitting of the energy accumulator to the connecting unit and a corresponding fixation are ensured. This also ensures a reliable and permanent electrical contact between the energy accumulator and the connecting unit.

[0011] According to a preferred embodiment, the fixing part of the adapter has a fixing lug which corresponds to the coupling cam of the energy accumulator. The fixing lug can thus be form-lockingly fixed to the coupling cam. This provides the advantage of a secure fit and secure fixation of the adapter to the energy accumulator. At the same time, the secure fit prevents tilting and oblique positions. An energy accumulator equipped in this way can therefore be reliably and securely fixed to the coupling unit of a micromobility vehicle.

[0012] In a further preferred embodiment, the fastening part has a fastening hole through which the fastening means can pass. The fastening part can be removably fastened to the energy accumulator by means of the fastening hole. The fastening means is thus inserted through the fastening hole into a corresponding socket of the energy accumulator and fastened. The fastening means can be, for example, a screw. This screw can be screwed into a corresponding thread of the energy accumulator.

[0013] According to another preferred embodiment, the coupling structure comprises, at the coupling portion, a coupling surface with which the lever of the coupling unit can engage, in such a way that a displacement of the adapter perpendicular to the coupling surface is caused, preferably in such a case that the coupling surface is oriented parallel to the end face of the energy accumulator when the adapter is mounted.

[0014] According to a preferred embodiment of the adapter, the coupling structure has a curved surface. The lever of the coupling unit can slide along this curved surface when engaged. In so doing, a force is applied onto the coupling surface. In this case, the curved surface is preferably oriented transversely to the coupling surface, the two surfaces being perpendicular to each other. The curved surface allows the lever to slide easily. Thus, a supported guide can be provided when coupling a correspondingly equipped energy accumulator to the coupling unit.

[0015] The energy accumulator according to the invention for supplying energy to a micromobility vehicle comprises a connection profile, which on the one hand serves to connect the energy accumulator to a corresponding holding device or to a coupling device of the micromobility vehicle. On the other hand, the connection profile has the function that an adapter, for example the above-mentioned adapter, can be connected to this connection profile with its fastening part and fixed thereto in order to use the energy accumulator also for components other than the corresponding holding device or coupling unit. The design of the connection profile, which on the one hand can engage the lever of the corresponding coupling unit and on the other hand can accommodate the adapter, results in a dual function for the connection profile. This therefore provides multiple options for using the energy accumulator. There is no need to provide an additional special socket for fixing the adapter in order to adapt the energy accumulator to a normal coupling unit for a normal energy accumulator.

[0016] According to a preferred embodiment, the connection profile is formed by a recess on the upper side of the energy accumulator. The recess has a wall and a connection cam. The connection cam is preferably flush with the end face of the energy accumulator. The connection profile is designed such that the engagement surface faces away from the end face. The engagement surface thus corresponds to the connection part of the adapter such that the connection part of the adapter is held between the engagement surface and the wall, preferably form-fittingly. This allows a reliable and precise fit of the adapter to the connection profile of the energy accumulator.

[0017] The coupling unit according to the invention serves to couple the energy accumulators as described above. The coupling unit thus allows for the fixed installation of energy accumulators with a lower structural height than energy accumulators with a standard structural height (or standard cross section). The coupling unit thus allows for the attachment of energy accumulators, such as accumulators or batteries, to micromobility vehicles that provide only small structural space for the attachment of the energy accumulators. This may be advantageous, for example, for electric bicycles with small frames, such as children's bicycles. The coupling unit offers the advantage that the energy accumulator is only connected to the coupling unit at its end faces and is held mainly in the area of ​​the end faces. Additional holding elements can be provided which engage in grooves on the longitudinal sides of the energy accumulator. Nevertheless, the coupling unit allows the energy accumulator to be held and fixed regardless of its length.

[0018] In order to hold the energy accumulator reliably, firmly and securely in the connecting unit, the connecting unit comprises an engagement lever which engages into a connecting profile of the energy accumulator, where the rotation axis of the engagement lever is oriented perpendicular to the normal of the connecting side of the connecting unit. The connecting side is oriented parallel to the end face of the energy accumulator. The engagement lever forms a cam mechanism with the corresponding connecting profile of the energy accumulator, so that a pivoting movement of the engagement lever is converted into a translational movement of the energy accumulator parallel to the normal of the connecting side. When the lever is locked, it is possible to pull the energy accumulator into the connecting unit. When the lever is opened, the energy accumulator is pushed out of the connecting unit, allowing the energy accumulator to be easily removed.

[0019] According to a preferred embodiment of the coupling unit, the engagement lever is provided with a guide surface which rests against the engagement surface of the coupling cam of the energy accumulator when the engagement lever engages the coupling cam during pivoting, in this way a force is applied parallel to the normal of the coupling side in the direction of the coupling unit.

[0020] According to a further preferred embodiment of the connecting unit, the connecting unit comprises a holding rail with a holding element, which extends away from the connecting side of the connecting unit and is preferably oriented perpendicularly to the connecting side of the connecting unit. The holding element corresponds to a holding groove on the longitudinal side of the energy accumulator and engages in the holding groove when the energy accumulator is moved. In this way, the fitting and fastening of the energy accumulator to the extended connecting unit is improved. Furthermore, the guiding of the energy accumulator during the connection to the connecting unit is optimized, avoiding tilting during connection and fastening.

[0021] According to a further preferred embodiment, the coupling unit comprises a locking element, which is operatively connected to the operating lever such that a rotation or pivoting of the operating lever is prevented, and which is movable from a locked position to an unlocked position, in which the operating lever is released and can be rotated or pivoted, and thus allowing the engagement lever to be pivoted in order to unlock and release the coupled and fixed energy accumulator.

[0022] The system according to the invention for connecting an energy accumulator to a connecting unit comprises an energy accumulator, an adapter and a conventional connecting unit designed to receive and fasten a conventional energy accumulator (which has a higher height than the above-mentioned energy accumulator). The conventional connecting unit has a connecting side whose height and / or cross-sectional area is greater than the height or cross-sectional area of ​​the end face of the energy accumulator. The energy accumulator cannot therefore be easily fastened and fastened to a conventional connecting unit. The energy accumulator is modified with an adapter which is part of the system. As a result, the adapter is fastened to the energy accumulator. The fastening part of the adapter is inserted and fastened in the connecting profile of the energy accumulator. The energy accumulator thus modified allows fastening and fastening to a conventional connecting unit. The lever of the conventional connecting unit engages in the connecting structure of the adapter when pivoting, thus converting the pivoting movement of the lever into a translational movement of the energy accumulator equipped with the adapter. This system has the advantage that even small energy accumulators, which have a lower cross-sectional height and therefore a lower weight compared to the conventional energy accumulator, can be connected to a conventional connecting unit. This provides the user with a high level of flexibility, especially when wanting to save weight.

[0023] In a preferred embodiment of the system, the lever of the conventional coupling unit is pivotable parallel to the coupling side and forms a cam mechanism with the coupling structure of the adapter in order to convert the pivoting movement into a translational movement of the energy accumulator. The lever is therefore preferably guided by a curved surface of the adapter and engages the coupling surface. As a result, a force is applied perpendicular to the coupling surface.

[0024] The energy accumulator in the sense of the present invention is preferably a battery, a rechargeable battery or an accumulator. Micromobility vehicles include electric scooters, electric bicycles, pedelecs, electric bikes and similar electric vehicles with two wheels, possibly also with a second wheel in the form of a spaced apart twin wheel. A cam mechanism is a mechanism in which the output movement of a rotatably mounted first cam element occurs as a result of the aid of a linearly guided second cam element. The lever of the coupling unit forms the rotatably mounted cam element. The energy accumulator forms the linearly guided cam element. The cam mechanism thus converts the subsequent pivoting of the lever into a displacement of the energy accumulator. Subsequent pivoting refers to a pivoting of the lever starting from the position where the lever engages with the energy accumulator. In this case, the energy accumulator is displaced with respect to the coupling unit to which the lever is rotatably fixed.

[0025] The present invention is described and explained in detail below based on some selected exemplary embodiments in conjunction with the accompanying drawings. [Brief description of the drawings]

[0026] [Figure 1] FIG. 2 is a schematic diagram of a typical coupling unit with three different energy stores. [Diagram 2] 11 a and 11 b are diagrams of a low structural height energy accumulator and adapter; [Diagram 3] FIG. 2 is a diagram of an energy accumulator with a corresponding coupling unit. [Figure 4] 5a-d are detailed views of the energy accumulator and the coupling unit during coupling. [Diagram 5] 13A and 13B are detailed views of the operating lever of the connecting unit. [Figure 6] 4a to 4c show detailed views of a coupling unit with a locking element; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Fig. 1 shows a conventional coupling unit 10 with a lever 11 for receiving and coupling conventional energy accumulators. Two of these conventional energy accumulators 12 with different lengths A and B are shown in Fig. 1. These can be directly coupled to the conventional coupling unit 10. For this purpose, the conventional coupling unit 10 comprises a holding rail 14. The holding rail 14 comprises a holding element 16 which can engage in a holding groove 18 on a longitudinal side of the conventional energy accumulator 12.

[0028] 1 further shows an energy accumulator 20 having a length C, the structural height of which is significantly less than the structural height of a conventional energy accumulator 12. The height 22 of the energy accumulator 20, measured at the end face 24, is less than the corresponding height of the conventional energy accumulator 12. For this reason, the energy accumulator 20 cannot be easily coupled to a conventional connecting unit 10 and fixed thereto.

[0029] FIG. 1 also shows that the energy storage device 20 includes an adapter 30 disposed on the upper side 26 near the end face 24 .

[0030] The normal docking unit 10 and the energy accumulator 20 with the fixed adapter 30 form a system 100, in which even a small energy accumulator 20 with a low height 22 can be fixed to the normal docking unit 10. Thus, an energy accumulator 20 designed as a battery can be locked to the normal docking unit 10, despite the low height of the energy accumulator.

[0031] Figures 2a and 2b show a part of the energy accumulator 20 with an adapter 30. In Figure 2a, the adapter 30 is fixed to the energy accumulator 20 by being screwed on with a fixing element 28 in the form of a screw.

[0032] The energy accumulator 20 has a recess 32 on the upper side 26 near the end face 24. The recess 32 forms a coupling profile 34 with a coupling cam 36. The coupling cam 36 has an engagement surface 38. A lever of the coupling unit engages the engagement surface 38 to fixedly mount the adapter-less energy accumulator 20 to a compatible coupling unit.

[0033] The adapter 30 has a fastening part 40. The fastening part 40 has a fastening lug 42 which fits form-lockingly into the connection profile 34. When the adapter 30 with the fastening part 40 is inserted into the connection profile 34 of the energy accumulator 20, the fastening element 28 can be screwed through the fastening hole 44 into the threaded socket 46 of the energy accumulator in order to fasten the adapter. The connection part 48 is open at the top and has a connection structure 50 with which a lever of the conventional connection unit 10 can engage. Here, the lever, while engaging in the connection structure 50, is guided over at least one of the (arch-shaped) curved surfaces 52 and exerts a force on the connection surface 54, moving the adapter 30 together with the energy accumulator 20 in the direction of the conventional connection unit.

[0034] 3 shows an energy accumulator 20 with a low construction height and a compatible connecting unit 56. The compatible connecting unit 56 comprises an integrally molded retaining rail 58 with a retaining element 60 which engages in the retaining groove 18 of the energy accumulator 20.

[0035] The coupling unit 56 has a coupling side 62 with a plug-in interface 64. The plug-in interface 64 establishes an electrical connection between the energy storage device 20 and electrical components of the micromobility vehicle. The electrical components of the micromobility vehicle can be connected to the rear of the coupling unit 56.

[0036] The operating lever 66 allows the energy accumulator 20 to be coupled to the coupling unit 56 and is rotatable about a rotation axis 68 in order to releasably fasten the energy accumulator 20 to the coupling unit 56 .

[0037] 4a to 4c show the fastening of the energy accumulator 20 to the connecting unit 56 in different steps.

[0038] FIG. 4a shows the coupling unit 56. The coupling unit 56 has its coupling side 62 and at its plug-in interface 64 of a holding rail 58 fixed to the coupling unit 56. On the holding rail 58, the energy accumulator 20 is moved. An operating lever 66, which can be pivoted about a rotation axis 68, is provided with an engagement lever 70. The engagement lever 70 engages with the coupling profile 34 of the energy accumulator 20. FIG. 4a shows the energy accumulator spaced apart from the coupling unit 56, whereas FIG. 4b shows how the engagement lever 70 engages with a guide surface 72 with an engagement surface 38 of the coupling cam 36. The movement of the operating lever 66 in the direction of the arrow 74 causes a translational movement of the energy accumulator 20 in the direction of the arrow 76, thus parallel to the normal to the coupling side 62. As a result, the energy accumulator 20 is drawn towards the coupling unit 56.

[0039] The complete pivoting of the operating lever 66 is shown in Fig. 4c. At the end position of the complete pivoting, the engagement lever 70 completely abuts against the engagement surface 38 and draws the energy accumulator 20 into the connecting unit 56. The energy accumulator 20 then abuts with its end face against the connecting side 62 of the connecting unit 56. The energy accumulator 20 is fixedly mounted on the connecting unit 56.

[0040] An electrical connection is established from the energy accumulator 20 to the plug-in interface 64. As a result, the electrical components of the micromobility vehicle are electrically connected to the energy accumulator 20.

[0041] Fig. 4d shows a procedure for removing the energy accumulator 20 from the connecting unit 56. Here, the operating lever 66 is moved in the direction of the arrow 78. The engagement lever 70 abuts against a wall 80 of the connecting profile 34 and pushes the energy accumulator out of the connecting unit 56 in the direction of the arrow 81. By detaching and translating the energy accumulator, the user can easily remove it.

[0042] 5a and 5b show the lever mechanism of the connecting unit 56 in detail. The operating lever 66 is provided with a pretensioning element 82 arranged on its engagement lever 70 in order to ensure the compensation of manufacturing, assembly or other tolerances in the final position of the energy accumulator 20 when fixing the energy accumulator 20 to the connecting unit 56. The pretensioning element 82 is preferably designed to be elastic, for example as a rubber pretensioning element. The compensation of the tolerances is ensured by the pretensioning element 82 having a defined oversize 84. As a result, a pretension is generated for the energy accumulator 20. A tight and wobble-free fit of the energy accumulator into the plug-in interface 64 and into the connecting unit 56 is thus ensured.

[0043] 6a to 6c respectively show a detailed view of a coupling unit 56 to which an energy accumulator 20 is fixed.

[0044] The locking element 86 is arranged on the coupling unit 56 in such a way that it is operatively connected to the operating lever 66 and prevents the operating lever 66 from moving. The elongated locking element 86 is connected at one end to the coupling unit 56 by means of a screw, while the free end 88 has an end face that is in contact with and substantially flush with a longitudinal surface of the operating lever 66. The locking element 86 is movable such that the free end 88 can be pushed in the direction of the arrow 90 towards the coupling unit 56. As a result, the end face of the free end 88 is disengaged from the operating lever, as shown in detail in FIG. 6b.

[0045] The unlocked position is reached when the locking element 86 is pressed towards the coupling unit 56 so that its free end 88 moves under the operating lever 66 and exposes the narrow side 92 of the latter. In this unlocked position, the operating lever is released and it is possible to pivot the operating lever 66 in the direction of the arrow 94. The energy accumulator 20 can then be detached from the coupling unit 56 and removed. [Explanation of symbols]

[0046] 10 Normal connecting unit 11 Lever 12 Normal energy storage 14 Retaining Rail 16 Retention elements 18 Retaining groove 20 Energy Accumulator 22 Height 24 End face 26 Upper side 28 Fixed elements 30 Adapter 32 Recess 34 Concatenated Profiles 36 Connecting Cam 38 Engagement surface 40 Fixed part 42 Fixed lug 44 fixing hole 46 Threaded Socket 48 Connecting part 50 Connection structure 52 Curved surface 54 Connecting surface 56 Connecting Unit 58 Retaining Rail 60 retention elements 62 Connecting side 64 Plug-in Interface 66 Operating lever 68 Rotational Axis 70 Engagement lever 72 Guide surface 74 Arrow Direction 76 Arrow Direction 78 Arrow Direction 80 Wall 81 Arrow Direction 82 Pretensioning element 84 Oversized 86 Rock Elements 88 Free end 90 Arrow direction 92 Arrow Direction 94 Arrow Direction 100 Systems

Claims

1. An adapter fixed to an energy accumulator (20) of a micromobility vehicle and connecting said energy accumulator (20) to a connection unit, comprising: The adapter (30) comprises a fixed portion (40) and a connecting portion (48); the fixing part (40) is designed to be fixable to a socket of the energy accumulator (20), The connecting portion (48) comprises a connecting structure (50) which is designed to form a cam mechanism with a lever (11) of the connecting unit to convert engagement of the lever (11) by pivoting into the connecting structure (50) into a displacement transverse to the pivoting direction of the lever (11).

2. 2. The adapter according to claim 1, wherein the fixed part (40) has a fixing lug (42) that corresponds to a connecting cam (36) of the energy accumulator (20) and can be fixed to the connecting cam (36) in a form-locking manner.

3. 3. The adapter according to claim 1 or 2, characterized in that the fixed part (40) has fixing holes (44) for fixing means, in order to enable the fixed part (40) to be removably fixed to the energy accumulator (20).

4. 3. The adapter according to claim 1 or 2, wherein the coupling structure (50) comprises a coupling surface (54) with which the lever of the coupling unit can engage, causing a displacement of the adapter (30) perpendicular to the coupling surface (54).

5. 5. The adapter of claim 4, wherein the coupling structure (50) has a curved surface (52), and the lever of the coupling unit, when engaged, slides along the curved surface (52) to apply a force onto the coupling surface (54), and the curved surface (52) is disposed transversely to the coupling surface (54).

6. 1. An energy accumulator for supplying energy to a micromobility vehicle, the energy accumulator comprising: an end face (24) with an electric plug connector for connection with a connection unit (56); and a coupling profile (34) arranged in the region of an upper side (26) of the energy accumulator, the coupling profile (34) having a coupling cam (36) with an engagement surface (38), the connecting profile (34) is designed so that a lever of a connecting unit (56) engaging with the connecting profile (34) abuts against the engagement surface (38) and a pivoting movement of the lever is converted into a displacement of the energy accumulator (20) perpendicular to the end surface (24), 1. An energy accumulator, characterized in that the connection profile (34) is designed in such a way that an adapter (30) can be removably fixed to the connection profile (34), which adapts the energy accumulator (20) for connection to a conventional connection unit (10) for a conventional energy accumulator (12) of a higher height.

7. 7. The energy accumulator according to claim 6, wherein the coupling profile (34) is formed by a recess (32) on the upper side (26) of the energy accumulator (20), the recess (32) having a wall (80) and a coupling cam (36), the coupling cam (36) being flush with the end face (24), the engagement surface (38) facing away from the end face (24), and the engagement surface (38) corresponding to the coupling portion (48) of the adapter (30) such that the coupling portion is held in a form-locking manner between the engagement surface (38) and the wall (80).

8. A coupling unit for connecting and fixing an energy accumulator (20), said coupling unit comprising: a coupling side (62) having an electrical plug-in interface (64) for connecting with a plug connector on the end face (24) of the energy storage device (20); a terminal panel having a terminal interface for connecting a terminal connector of an electrical component, the plug-in interface (64) and the terminal interface being electrically connected to each other; The coupling unit also comprises an operating lever (66) that is rotatable about a rotation axis (68) and has an engagement lever (70) that is designed to engage with a coupling profile (34) of an energy accumulator (20), the rotation axis (68) being oriented perpendicular to the normal of the coupling side (62), the engagement lever (70) cooperating with the coupling profile (34) of the energy accumulator (20), so that a pivoting movement of the engagement lever (70) is converted into a translational movement of the energy accumulator (20) parallel to the normal of the coupling side (62).

9. 9. The coupling unit according to claim 8, wherein the engaging lever (70) has a guide surface (72), and when the engaging lever (70) engages with the coupling cam (36) as it pivots, the guide surface (72) abuts against the engaging surface (38) of the coupling cam (36) of the energy accumulator (20), and a force is applied in the direction of the coupling unit (56) parallel to the normal to the coupling side (62).

10. 10. The coupling unit according to claim 9, wherein the coupling unit (56) comprises a retaining rail (58) having a retaining element (60), the retaining rail (58) extending in a direction away from the coupling side (62), the retaining element (60) corresponding to a retaining groove (18) on a longitudinal side of the energy accumulator (20) and engaging with the retaining groove (18) of the energy accumulator (20) when the energy accumulator (20) is moved.

11. 11. The coupling unit according to any one of claims 8 to 10, wherein a locking element (86) is operatively connected to the operating lever (66) so as to prevent the operating lever (66) from rotating or pivoting, and wherein the locking element (86) is movable to an unlocked position, in which the operating lever (66) is released to rotate or pivot.

12. A system for coupling an energy accumulator (20) to a coupling unit and connecting said energy accumulator (20) to said coupling unit, comprising: an energy storage device (20) having an end face (24) on which an electrical plug connector is disposed; a conventional connection unit (10) having a connection side on which a plug-in interface (64) is arranged, said plug-in interface (64) being connectable to said plug connector; 1. A system comprising: an adapter (30) having a fixed portion (40) and a connecting portion (48) having a connecting structure (50), wherein the height (22) of the end face (24) is less than the height of the connecting side; The energy accumulator (20) comprises a connection profile (34) arranged in its upper region, with which an engagement lever (70) of a compatible connection unit (56) can engage, The interlocking profile (34) is formed from an interlocking cam (36) having a recess (32) and an engagement surface (38); The connecting profile (34) is designed to receive the fixing portion (40) of the adapter (30), The adapter (30) comprises a coupling structure (50) having a coupling surface (54) and a curved surface (52); The adapter (30) is removably fixed to the energy accumulator (20) at its fixing portion (40); The system is characterized in that the normal connection unit (10) has a lever (11) that engages with the connection structure (50) of the adapter (30) when pivoted, so that the pivoting movement is converted into a translational movement of the energy accumulator (20), which moves the energy accumulator (20) towards the normal connection unit (10), and the lever (11) engages with the connection surface (54) of the adapter (30) and is guided on the curved surface (52) of the adapter (30).

13. 13. The system according to claim 12, wherein the lever (11) of the normal coupling unit (10) is pivotable parallel to the coupling side, and the lever (11) forms a cam mechanism with the coupling structure (50) to convert a pivoting movement into a translational movement.

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