DE102020113121A1 - Locking device for locking a battery unit and a bicycle and a method for unlocking a battery unit - Google Patents

Abstract

The invention relates to a locking device for locking a battery unit, in particular for locking a battery unit on a holder for a battery unit, for example on a vehicle or a vehicle frame, the locking device comprising a bolt and an electric actuator, the actuator engaging the bolt to to move the bolt from a locking position into a first release position, the locking device being designed such that the bolt can be automatically disengaged from the actuator during and / or after the release of the battery unit. The invention also relates to a bicycle and a method to unlock a battery unit.

Description

The invention relates to a locking device for locking a battery unit, in particular for locking a battery unit on a holder for a battery unit, for example on a vehicle or a vehicle frame.

Some vehicles, such as some bicycles, are equipped with battery units. For example, an electric bicycle (e-bike) can be equipped with a battery unit in order to supply a drive system of the bicycle with power. Such battery units may need to be removable or replaceable, e.g. for remote charging and / or to enable the replacement of an empty or defective battery unit with a charged or new battery unit. However, such a removable battery unit can be stolen from a corresponding vehicle if the battery unit is not locked to the vehicle.

Locks for battery units are known in the form of mechanical locks that use physical keys as an authentication mechanism. This means that users can only operate the lock if they have an appropriate key with them, which can be a nuisance. In addition, this makes it difficult - e.g. in rental or sharing scenarios - the dynamic authentication of different users in different time windows.

Electronic locks are widely known as one way of overcoming some of the disadvantages of mechanical locks. Such locks can be controlled via electronic, e.g. digital, authentication mechanisms - e.g. by means of wireless communication technologies. A general disadvantage of electronic locks is that they require a source of electrical power, e.g. a specially designed battery is required. A dedicated battery for a lock can be costly, complicate the construction of the vehicle, and affect its usability.

The present invention aims to overcome the above problems and disadvantages. The invention aims in particular to provide a solution for locking a battery unit in which the battery unit can operate in a user-friendly, efficient and reliable manner.

For this purpose, according to one aspect of the invention, a locking device according to the features of claim 1 is provided.

In particular, a locking device is provided for locking a battery unit, in particular for locking a battery unit on a holder for a battery unit, for example on a vehicle or a vehicle frame, the locking device comprising a bolt and an electric actuator, the actuator engaging the bolt to to move the bolt from a locking position (for locking / engaging the battery unit) into a first release position (for releasing the battery unit), the locking device being designed such that the bolt is automatically disengaged from the battery unit during and / or after the release of the battery unit Actuator can be brought.

During operation, the battery unit can be unlocked electronically using the electric actuator. In particular, the electric actuator initially engages the bolt and can be controlled (powered) to move the bolt from the locking position (in which the bolt can lock the battery unit or hold it in place) into the first release position. The latch can then be automatically disengaged from the actuator during and / or after the battery unit is released. In particular, after such a disengagement of the actuator with the bolt, the bolt movement can be achieved independently of a state of the actuator (in particular independently of the availability of electrical power). This means that a subsequent locking of a battery unit (e.g. when replacing the battery unit) can be made possible automatically, preferably mechanically, and preferably without the actuator having to be electrically powered. In a preferred embodiment the configuration is such that after the replacement of the battery pack, the engagement of the actuator with the bolt can be automatically restored and the actuator - e.g. Can be (again) electrically fed via the electrical power provided by the inserted battery unit, so that the locking device returns to an initial locking state.

Preferably, the locking device comprises a spring means which is designed so that it counteracts a bolt movement by means of spring force, and which is designed, for example, so that it is compressed by the bolt when the bolt moves from the locking position to the first release position.

In this way (preferably without the use of electrical power), especially after a corresponding battery unit has been released from the locking device, a automatic restoration of the bolt position can be achieved. In addition, the bolt can in this way (under spring force) be held in a battery receiving state for receiving and, for example, automatic locking of a battery unit during the insertion of the battery unit (and again preferably without the use of electrical energy).

According to a preferred embodiment, the locking device comprises an engagement element for transmitting an actuator movement to the bolt, the engagement element being adjustable between an engaged state for engaging the bolt and a disengaged state for releasing the bolt.

The adjustable engagement element can achieve a mutual engagement and disengagement (release) between the bolt and the actuator and also a transmission of the movement of the actuator in the event of an engagement between the actuator and the bolt.

According to a further embodiment, the latch can be designed to move from the first release position into a second release position under the influence of an external force, for example pressure from the battery unit during its removal, in particular when the unit passes the latch. The engagement element is preferably designed to automatically enter the disengaged state when (as a result of the fact that) the bolt moves from the first release position into a second release position.

The bolt can thus be automatically disengaged from the actuator during and / or after the battery unit is released. In other words: a movement of the battery unit in order to remove this unit can lead to a bolt displacement (from the first release position into the second release position), wherein this bolt displacement can lead to the engagement element entering a corresponding bolt release position (whereby the Bolt is decoupled from the electric actuator).

The invention further provides a bicycle with a locking device according to the invention, a system comprising a locking device according to the invention and a battery unit to be locked by the locking device, and a method for unlocking a battery unit.

In this way the advantages mentioned above can be achieved.

Further advantageous developments of the invention are provided by the features of the dependent claims.

• die 1 eine auseinandergezogene isometrische Ansicht einer Verriegelungseinrichtung, einer Montageplatte und eines Teils einer Batterieeinheit gemäß einer beispielhaften Ausführungsform;
• die 2a eine isometrische Ansicht eines Teils der in der 1 gezeigten Verriegelungseinrichtung im zusammengebauten Zustand;
• die 2b eine Unteransicht der Verriegelungseinrichtung der 2a;
• die 2c einen Querschnitt entlang der Linie II-II der 2b;
• die 3 eine isometrische Seitenansicht eines Eingriffselements, einer Eingriffswelle und eines Stellantriebsverbinders der beispielhaften Ausführungsform der Verriegelungseinrichtung der 1;
• die 4 eine isometrische Seitenansicht eines Riegels der exemplarischen Ausführungsform;
• die 5a eine Draufsicht auf die Ausführungsform der 1, wobei der Riegel sich in einer Verriegelungsstellung befindet;
• die 5b einen Querschnitt entlang der Linie V-V der 5a;
• die 6a ähnlich zu der 5a und zeigt das System mit dem Riegel in einer ersten Freigabestellung;
• die 6b einen Querschnitt entlang der Linie VI-VI der 6a;
• die 7a ähnlich zu der 5a und zeigt das System mit dem Riegel in einer zweiten Freigabestellung;
• die 7b einen Querschnitt entlang der Linie VII-VII der 7a;
• die 8a ähnlich zu der 5a und zeigt das System mit der Batterieeinheit in daraus entfernter Stellung;
• die 8b einen Querschnitt entlang der Linie VIII-VIII der 8a;
• die 9a ähnlich zu der 8a und zeigt das System nachdem die Batterie ausgetauscht und verriegelt wurde, vor dem Eingriff durch den Stellantrieb;
• die 9b einen Querschnitt entlang der Linie IX-IX der 9a;
• die 10a ähnlich zu der 9a und zeigt das System nach dem Batterieaustausch und nach dem Eingriff durch den Stellantrieb;
• die 10b einen Querschnitt entlang der Linie X-X der 10a;
• die 11 einen Ausschnitt Q1 der 6b; und
• die 12 einen Ausschnitt Q2 der 7b.

The invention is explained below with the aid of exemplary embodiments and drawings. In the drawings shows or is:

• the 1 an exploded isometric view of a locking device, a mounting plate and a portion of a battery pack according to an exemplary embodiment;
• the 2a an isometric view of part of the 1 locking device shown in the assembled state;
• the 2 B a bottom view of the locking device of 2a ;
• the 2c a cross section along the line II-II of 2 B ;
• the 3 FIG. 6 is an isometric side view of an engagement member, an engagement shaft, and an actuator connector of the exemplary embodiment of the locking device of FIG 1 ;
• the 4th Fig. 3 is an isometric side view of a latch of the exemplary embodiment;
• the 5a a plan view of the embodiment of 1 , wherein the bolt is in a locking position;
• the 5b a cross section along the line VV of 5a ;
• the 6a similar to that 5a and shows the system with the bolt in a first release position;
• the 6b a cross section along the line VI-VI of 6a ;
• the 7a similar to that 5a and shows the system with the bolt in a second release position;
• the 7b a cross section along the line VII-VII of 7a ;
• the 8a similar to that 5a and shows the system with the battery pack removed therefrom;
• the 8b a cross section along the line VIII-VIII of FIG 8a ;
• the 9a similar to that 8a and shows the system after the battery has been replaced and locked, prior to actuator intervention;
• the 9b a cross section along the line IX-IX of FIG 9a ;
• the 10a similar to that 9a and shows the system after battery replacement and after actuator intervention;
• the 10b a cross section along the line XX of the 10a ;
• the 11 a section Q1 of the 6b ; and
• the 12 a section Q2 of the 7b .

Corresponding features are identified by corresponding reference symbols in the drawings.

The drawings show a system comprising a locking device 1 , a mounting plate 26th and a battery unit 2 (partially visible) according to an exemplary embodiment. As can be seen from the drawings (see the 1 and 2a) , is the locking device 1 to lock the battery unit 2 designed, in particular for locking the battery unit to a holder for a battery unit, which can be rigidly connected to the locking device, for example via the mounting plate, for example on a vehicle or vehicle frame (not shown). The locking device comprises a bolt 3 and an electric actuator 4th , the actuator 4th in the bolt 3 engages to move the bolt from a locking position into a first release position. As will be explained in more detail below, the present locking device is designed with great advantage in such a way that the bolt 3 during and / or after releasing the battery unit 2 automatically disengages from the actuator 4th can be brought.

The control (e.g. activation and deactivation) of the actuator 4th can, as will be apparent to those skilled in the art, be achieved in different ways. In particular, the actuator 4th by electrical power from the battery unit 2 powered (if the unit is present / installed). The locking device can, for example, comprise line means for electrical power (not shown) in order to provide such power, for example directly or indirectly via the battery 2 when it is held in the corresponding holder for a battery unit. The locking device 1 can for controlling the electrical power, eg for activating (and deactivating) the actuator, comprise a control unit of the electronic actuator (which can be integrated into the actuator, or which can be an external or remote unit). The actuator 4th can, for example, be controlled based on a control signal for the actuator, for example via a remote control or in some other way. The actuator 4th may be equipped with or connected to communication means for receiving such a control signal. The control of the actuator 4th can also transmit a specific code or signal for activation (e.g. unlocking) to the actuator 4th , to a corresponding actuator control and / or to actuator communication means. In a further embodiment, an actuator control can be integrated into a vehicle control if the locking device is part of a vehicle or is mounted in a vehicle. Optionally, the locking device itself comprises a dedicated power source for the actuator, for example a battery or a capacitor, in order to locally supply the actuator electrically, or to provide additional actuator power if there is no battery unit 2 is available to provide such performance.

In particular, the locking device 1 after assembly on the mounting plate 26th be mounted, which can be part of a holder for a battery unit or part of a frame, for example a vehicle, for example an electric bicycle.

The locking device 1 can comprise a housing (in this example two sub-housings 17th , 18th includes). The case 17th , 18th is designed to at least partially hold the bolt so that the bolt 3 can be moved between different positions. These positions include an initial locking position of the battery pack (see fig 5a and 5b) , in which a distal part of the latch 3 out of the case 18th out and into a recording 22nd the battery unit 2 protrudes into it (in this example it passes through a mounting plate opening 27 through the mounting plate 26th ), as well as various withdrawn positions in the 6a , 6b , 7a , 7b are shown. A bolt retraction direction is indicated in the drawings by the arrow 20th displayed.

For controlling and / or changing the position of the bolt 3 includes the present facility 1 a spring means 15th , which counteracts a retraction movement of the bolt. In this case the spring means comprises a compression spring 15th that between the latch 3 and the case 17th can be compressed and when compressed, a spring force on the bolt 3 can exercise. The locking device also comprises 1 the electric actuator 4th the one with the bolt 3 can be brought into engagement and which, when engaged, a position of the bolt 3 can control. The device 1 is designed so that the latch 3 automatically disengages from the actuator 4th can be brought, preferably depending on a position of the bolt 3 (in relation to the bolt housing or the mounting plate).

The actuator 4th is preferably a gear actuator 4th or an actuator provided with gears, for example an electric motor or servomotor having a gear, so that the actuator 4th is essentially position controllable.

The present locking device 1 comprises an engagement element 5 for transmitting an actuator movement to the bolt, wherein the engagement element 5 between an engagement state (see e.g. 5b and 6b) to engage with the bolt 3 and a disengaged condition (see e.g. 7b and 8b) to release the latch 3 is adjustable.

In particular, the facility 1 for engaging and operating the bolt 3 (via the engagement element 5 ) in addition, e.g. an actuator connector 25th and an optional engagement spring 14th include. Like in the 3 shown is the actuator connector 25th with a rotating shaft 7th of the actuator 4th coupled so that a rotation of this rotary shaft of the actuator 7th one rotation of the actuator connector 25th (around the corresponding axis of rotation K) for example (see the 3 ) in a first rotary actuation direction 29 and / or a second rotary actuation direction 30th causes.

In this example, the engagement element is 5 pivotable on the actuator connector 25th mounted, with a corresponding pivot axis (ie axis of rotation) L normal to the axis of rotation K of the actuator connector 25th runs. In particular, the actuator connectors 25th and the engaging element 5 via (small) trunnions / pivot shafts 6th (see the 2 B and 6b) with corresponding swivel openings 5a cooperate, pivotally connected to each other. The engagement element 5 is about the pivot axis L, which is created by such a pivot connection 5a , 6th is provided - in particular between a first pivot position for engaging the bolt 3 and a second pivot position for releasing the bolt 3 as in the 6a , 6b or. 7a , 7b shown, rotatable / pivotable. In this configuration, the engaging element is 5 due to coupling with the actuator connector 25th also rotatable about the actuator axis of rotation K.

The present trunnion 6th are perpendicular to the axis of rotation K of the actuator shaft. Like in the 3 shown is the engagement element 5 in a robust and compact configuration essentially U-shaped and encloses at least part of the rotary connector of the actuator. For example, the trunnions 6th (which provide a corresponding pivot shaft) at or near the ends of the legs of the U-shaped engagement element 5 be arranged.

Since the engagement element 5 especially about the pivot connection 5a , 6th (ie the corresponding axis of rotation L) is rotatable / pivotable, is the engagement element 5 in the configuration shown in relation to the bolt 3 - in particular towards this and / or away from this - rotatable. In this way, the engagement element 5 with the bolt 3 engaged or disengaged.

As in the 2a , 2 B and 2c shown, the above-mentioned engagement spring 14th be arranged (and e.g. biased) so that they are the engagement element 5 by means of spring force to an opposite side of the bolt 3 (ie from the second pivot position into the first pivot position) drives. In the example, the engagement spring 14th by the engagement element 5 can be elastically deformed, and if so deformed, the engaging member 5 towards the latch 3 to press. The engagement spring 14th is preferably a leaf spring 14th , but can also have a different spring structure.

In this example, the engagement element comprises 5 for engagement with the latch 3 a cam 9 (please refer 3 ), which protrudes from a side of the engaging element facing an opposite locking side, while the locking 3 a corresponding cam receiving recess 11 (please refer 4th ) can include in this latch side. The recess 11 comprises at least one first (inner) recess side 12 for receiving an operating force from the cam 9 during a cam movement to retract the bolt, wherein the actuating force is preferably in the aforementioned retraction direction 20th is directed.

In this example, the engagement element rotates 5 around the corresponding axis of rotation 7th - in the second rotary actuation direction 30th - to a shift of the bolt 3 . The cam receiving recess 11 preferably comprises one of the first recess side 12 opposite second recess side 13 (see the 4th and 11 ), with the second recess side 13 angled (ie oblique) to the direction of retraction 20th runs. The orientation of the second side of the recess 13 is such that a certain final displacement of the bolt 3 in the retreat direction 20th (which final shift in the 6b and 7b is shown) the cam 9 from the bolt 3 away, ie out of the cam receiving recess 11 can push out, causing the latch 3 out of engagement with the engagement element 5 is brought. In this example, this final bolt shift is not caused by the actuator, but by an external force, in particular by pressure from a released battery unit 2 while removing this unit from the locking device 1 , reached.

Furthermore, the bolt ( 3 ) with reference to the 4th preferably one or more retaining edges 28 on that can prevent the latch 3 due to the action of the latch spring 15th or in some other way (e.g. by gravity) beyond a locking position or other desired position out of the housing 17th , 18th is moved.

Like in the 4th shown, the present bolt 3 preferably a tapered distal end 16 with a first (diagonal) side 19th and preferably a second (diagonal) side 21st on. Such sides can have forces that are essentially transverse to the direction of retraction 20th running directions are applied to the bolt, in displacements of the bolt 3 in the retreat direction 20th convert.

For example, the tapered end can be the first diagonal side 19th to a direction of retreat 20th run essentially at an angle, preferably at an angle of between 20 and 70 degrees, preferably at an angle of approximately 45 degrees. The second diagonal side can also be used 21st extend, for example, essentially at an angle to the direction of retraction, preferably at an angle of between 20 and 70 degrees, preferably at an angle of about 45 degrees, the second diagonal side extending essentially at an angle to the first diagonal side, preferably at a Extends angle of between 45 and 135 degrees, preferably at an angle of about 90 degrees.

The operation of the locking device 1 can be done as follows.

The 5a and 5b show the latch 3 in a locking position, the distal portion of the latch 3 in the recording 22nd a battery unit 2 is added, allowing removal of the battery unit 2 at least in the corresponding distance direction 24 is blocked. At least the first diagonal side is in this position 19th and preferably also the second diagonal side 21st of the bolt essentially completely in the receptacle 22nd included to prevent unauthorized opening. The latch spring 15th is between the latch 3 and the case 17th spring-loaded (in this case partially compressed) so that the latch 3 is held essentially in the locked position.

In the 5b the bolt is not held in the locked position by the actuator because the actuator does not yet engage the bolt. Like in the 5b shown, the cam is located 9 of the engagement element 5 not yet in the recess 11 of the bolt and only touches an opposite outer longitudinal side of the bolt 3 . In the state shown, the engagement element 5 by the engagement spring 14th in the direction of and against the long side of the bolt 3 pressed. The cam is in this position 9 not completely in the recess 11 added, and the engagement element 5 is not fully engaged with the latch 3 .

To the engagement element 5 in engagement with the latch 3 can bring the actuator 4th in the first rotary actuation direction 29 (see the 2 ) are actuated, whereby the engagement element 5 is rotated and the cam 9 in the direction of the second recess side 13 moved and with the recess 11 is aligned. Due to the spring action of the engagement spring 14th subsequently becomes the cam 9 into the recess 11 pressed and thus the engagement element 5 in engagement with the latch 3 brought.

It should be noted that such an engagement state can also be used for further locking the bolt in its locking position.

Once it is so engaged, the actuator 4th in the second rotary actuation direction 30th operated (see the 2a) , whereby the engagement element 5 is rotated to the latch 3 in the retreat direction 20th towards a first release position, as in the 6a and 6b shown (see also the detailed view of the 11 ) to move. In this bolt position, the first diagonal side protrudes 19th the tapering end 16 of the bolt 3 partly from the recording 22nd the battery unit 2 out. Thus, the battery unit 2 released from the locking device (as described in the 7a , 7b , 8a and 8b shown). It also causes the battery unit to move 2 in the removal direction 24 that the latch 3 further in the withdrawal direction 20th (ie the final shift of the bolt mentioned above 3 ) to a second release position, which is in the 7b is shown (see also the detailed view of the 12 ) is pressed.

During the latch 3 is pushed in this way towards the second release position, the cam 9 through the inclined second recess side 13 from the recess 11 pushed out, whereby the corresponding engagement element 5 (about the corresponding pivot axis L) from the bolt 3 is swiveled away. Moving the latch 3 the second release position thus brings about the disengagement of the engagement element 5 with the bolt 3 . When the latch 3 is in the second release position, the battery unit 2 further in the removal direction 24 be moved - for example to remove the battery from a corresponding holder.

Like in the 8b shown, causes the locking spring 15th after removing the battery unit 2 that the latch 3 moves back in the direction of the locking position to pick up a battery unit again (without actually locking a battery unit). Otherwise, the engagement element 5 - especially up to the actuator 4th is fed again - in its in the 8b position shown (the engagement cam is now from the bolt 3 spaced) remain. According to a preferred embodiment, the actuator is available 4th after removing (but before replacing) the battery unit 2 no electrical power available.

If the same (or a replacement) battery unit 2 is then exchanged, ie in the recording direction 23 is moved to a corresponding recording position (see the 9a and 9b) , the battery unit can 2 on the second diagonal side 21st act to the latch 3 in the retraction direction, for example, up to the second release position, as in FIG 7b shown to press, after which the battery unit 2 further in the recording direction 23 and in a receiving position, as in the 9b shown can be moved to through the latch 3 to be locked (again).

In particular, the locking spring causes 15th , like in the 9b shown that the replaced battery unit 2 locks automatically without the electric actuator 4th necessarily involved at this point.

Next, the replaced battery unit 3 the actuator 4th feed again (although the actuator 4th , as already mentioned, can also be fed in other ways). As soon as it is fed, the actuator can 4th (for example via a suitable control signal) in the first rotary actuation direction 29 be operated to the engagement element 5 for example in the position 5 , like in the 5b shown to bring back. The 10b shows how at least during this transition the engagement element 5 , similar to the one in the 2a to c configuration shown, with the engagement spring 14th is in contact and is pressed by this.

A compact and reliable solution for locking a battery unit is thus provided, the battery unit being able to be locked quickly without electrical power consumption at the time of locking, the battery unit being able to be unlocked electronically.

Although the invention has been explained with reference to exemplary and preferred embodiments, it is to be understood that modifications thereof are possible and are considered to be included within the scope of the invention as defined in the claims.

List of reference symbols

1.

Locking device

2.

Battery unit

3.

bars

4th

Electric actuator

5.

Engagement element

6.

Engagement shaft

7th

Axis of rotation of the electric actuator

8th.

Direction of extension of the engagement shaft

9.

cam

10.

Cam side

11.

Cam receiving recess

12.

First side of the recess

13.

Second side of the recess

14th

Engagement spring

15th

Latch spring

16.

Tapered end

17th

Housing (first part)

18th

Housing (second part)

19th

First diagonal side

20th

Withdrawal direction

21st

Second diagonal side

22nd

admission

23.

Shooting direction

24.

Distance Direction

25th

Actuator connector

26th

Mounting plate

27.

Mounting plate opening

28.

Retaining edges of the bolt

29

First direction of rotation

30th

Second direction of rotation

Claims (21)

A locking device (1) for locking a battery unit (2), in particular for locking a battery unit on a holder for a battery unit, for example on a vehicle or a vehicle frame, wherein the locking device comprises a bolt (3) and an electric actuator (4), the actuator (4) engaging in the bolt (3) to move the bolt from a locking position into a first release position, the locking device being designed in this way that the bolt can be automatically disengaged from the actuator during and / or after releasing the battery unit. Locking device according to Claim 1 wherein the locking device (1) is designed in such a way that the engagement of the actuator (4) with the bolt (3) can be restored by the electric actuator, in particular by electrically supplying the actuator. Locking device according to one of the preceding claims, wherein the locking device comprises a spring means (15) which is designed so that it counteracts a bolt movement via spring force and which is designed, for example, so that it is compressed by the bolt when the bolt is out of the Locked position moved into the first release position. Locking device according to one of the preceding claims, wherein the locking device comprises an engaging element (5) for transmitting an actuator movement to the bolt, the engaging element being adjustable between an engaged state for engaging in the bolt and a disengaged state for releasing the bolt. Locking device according to Claim 4 , the bolt (3) being designed to move from the first release position into a second release position under the influence of an external force, for example removal of a battery unit, the engagement element (5) being designed to automatically switch to the disengaged state occur when the bolt moves from the first release position into a second release position. Locking device according to Claim 4 or 5 wherein the engaging element (5) is rotatable by the actuator (4) when the engaging element (5) is in its state of engaging the bolt, in order to move the bolt to the first release position. Locking device according to one of the Claims 4 to 6th wherein the engagement element is in engagement with the electric actuator via a rotatable pivot shaft (6) of the electric actuator. Locking device according to Claim 7 , wherein the rotatable pivot shaft (6) runs essentially at an angle, preferably perpendicular, to an axis of rotation (K) of the electric actuator. Locking device according to one of the Claims 4 to 8th wherein the engagement element is substantially U-shaped. Locking device according to one of the Claims 4 to 9 wherein the engaging element comprises a cam (9), the latch comprising a cam receiving recess (11) for receiving the cam. Locking device according to Claim 10 , wherein the cam receiving recess has a first recess side (12) for receiving an actuating force from the cam, wherein the cam receiving recess preferably has a second recess side (13) for exerting a disengaging force on the cam, the second recess side preferably opposite the first recess side . Locking device according to one of the Claims 4 to 11 wherein the locking device comprises an engaging spring (14) which is designed to press the engaging element in the direction of the bolt using spring force. Locking device according to one of the preceding claims, wherein the bolt has a tapered end (16), wherein the locking device is designed such that, when the bolt is in the first release position, the tapered end at least partially consists of a housing (17, 18) the locking device protrudes in order - in particular in cooperation with a battery unit during the removal of the battery unit - to force the bolt into a final retracted position. Locking device according to Claim 13 , wherein the tapered end has a first diagonal side (19) which extends essentially at an angle - preferably at an angle of between 20 and 70 degrees, preferably at an angle of about 45 degrees - to a direction of retraction (20), wherein the withdrawal direction runs from the locking position in the direction of the first release position. Locking device according to Claim 14 , wherein the tapered end has a second diagonal side (21), wherein the second diagonal side extends essentially at an angle - preferably at an angle of between 20 and 70 degrees, preferably at an angle of about 45 degrees - to a direction of retraction, wherein the second diagonal side is essentially under one Angle to the first diagonal side - preferably at an angle of between 45 and 135 degrees, preferably at an angle of about 90 degrees - extends. Locking device according to one of the preceding claims, wherein the locking device is designed such that the electric actuator can be fed by a battery unit (2) which is locked by the locking device. Locking device according to one of the preceding claims, wherein the locking device is designed to be mounted on or in a bicycle, preferably an electric bicycle. A bicycle comprising a locking device according to one of the preceding claims for locking a battery unit (2), in particular for locking a battery unit on the bicycle. Bike after Claim 18 , wherein the bicycle is an electric bicycle, wherein the bicycle comprises a holder for a battery unit for receiving a corresponding battery unit (2), wherein the bicycle comprises at least one electrically actuatable device that can be fed by a battery unit received by the holder, the Locking device is designed to lock the battery unit received on the holder, the battery unit preferably having a receptacle (22) for at least partially receiving the bolt of the locking device when the bolt is in the locking position. A system comprising a locking device according to any one of Claims 1 to 17th , and a battery unit that is to be locked by the locking device, wherein the system comprises in particular a holder for a battery unit for receiving the battery unit, wherein the locking device is configured to lock the battery unit on the holder for a battery unit. A method for unlocking a battery unit (2), for example using a locking device according to one of the Claims 1 to 17th wherein the method comprises: - the provision of a locking device comprising a bolt (3) and an electric actuator (4), wherein the actuator (4) engages in the bolt (3); - The feeding of the actuator (4) for moving the bolt from a locking position into a first release position; and - disengaging the bolt from the electric actuator (4).

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