Lock for an accumulator

Abstract

The invention relates to a system comprising a machine tool and at least one accumulator () as the power supply for the machine tool, comprising at least one energy storage element, containing a locking device with at least one locking element for releasably connecting the at least one accumulator to the machine tool. The locking device contains at least one actuator for reversibly moving the at least one locking element from a first position into a second position, wherein in the first position, the accumulator can be moved relative to the machine tool, and in the second position, the accumulator is immovably connected to the machine tool.

Description

[0001] Lock for an accumulator

[0002] The present invention relates to a system comprising a machine tool and at least one accumulator as a power supply for the machine tool with at least one energy storage element, containing a locking device with at least one locking element for releasably connecting the at least one accumulator to the machine tool.

[0003] Furthermore, the present invention relates to an accumulator for use in a system with a machine tool.

[0004] Furthermore, the present invention relates to a machine tool for use in a system with at least one accumulator.

[0005] Furthermore, the present invention relates to a method for controlling a locking device in a system comprising a machine tool and at least one accumulator as a power supply for the machine tool, wherein the locking device contains at least one actuator for reversibly moving at least one locking element from a first position to a second or third position.

[0006] Accumulators as a power supply for machine tools are widely known in the art. These accumulators contain a number of energy storage elements (also called energy storage cells or battery cells) that are designed and used to receive, store, and release electrical energy. The absorption of electrical energy into the energy storage elements can also be referred to as charging. The release of electrical energy from the energy storage elements can also be referred to as discharging.

[0007] One problem with using a rechargeable battery on a machine tool is the unwanted or unavoidable relative movement between the rechargeable battery and the machine tool. This relative movement between the rechargeable battery and the machine tool can lead to wear on the contacts and excessive heating of the contacts. This can impair or reduce the transfer of electrical energy from the rechargeable battery to the machine tool. The object of the present invention is to solve the problem described above.

[0008] The object is also achieved by the subject matter of claims 1, 5, 6 and 9. Further advantageous embodiments of the invention are described in the subclaims.

[0009] The object is achieved in particular by a system having a machine tool and at least one accumulator as a power supply for the machine tool with at least one energy storage element, containing a locking device with at least one locking element for releasably connecting the at least one accumulator to the machine tool.

[0010] According to the invention, the locking device contains at least one actuator for reversibly moving the at least one locking element from a first position to a second position, wherein in the first position the accumulator is movable relative to the machine tool and in the second position the accumulator is immovably connected to the machine tool.

[0011] The actuator can be designed, in particular, as an electromechanical actuator. Alternatively, the actuator can also be designed as a hydraulic or pneumatic actuator.

[0012] The term “immobile” in connection with the second position means that relative movement between the accumulator and the machine tool is limited to a minimum or no relative movement can take place between the accumulator and the machine tool.

[0013] According to an advantageous embodiment, it may be possible for at least one actuator to be activated via an activation device. The activation device can be operated by a user of the machine tool via an input panel. The input panel can be configured as at least one switch on an outer wall of the accumulator housing.

[0014] According to a further advantageous embodiment, it may be possible for the at least one actuator to be activated via at least one sensor. The at least one sensor may be an acceleration sensor, motion sensor, distance sensor, position sensor, or the like.

[0015] According to a further advantageous embodiment, it may be possible for the locking device to contain at least one drive for translationally moving the at least one locking element. The drive can be configured as a rotary drive or a linear drive.

[0016] The rotary drive can be designed with at least one eccentric.

[0017] The linear drive serves in particular to generate a translational movement and can be designed, for example, in the form of a hoist, a winch, a rack and pinion, a linear chain, a traction drive, a cam disc, a piezo motor, a folding spindle, a threaded spindle, an electric cylinder, a ball screw, or a roller screw. The roller screw can be designed, in particular, as a roller screw with roller return or with a planetary roller screw.

[0018] In addition, the linear drive can also be designed in the form of a hydraulic cylinder or a pneumatic cylinder.

[0019] It is also possible for the linear drive to be electromechanically designed. The electromechanical linear drive can, for example, be designed in the form of a linear motor with an electrodynamic operating principle or as a linear actuator. The linear actuator can be designed with a piezoelectric, electrostatic, electromagnetic, magnetostrictive, or thermoelectric operating principle.

[0020] According to an advantageous embodiment, it may be possible to include at least one acceleration sensor for detecting at least one acceleration value, wherein the at least one acceleration sensor is connected to the locking device, so that the at least one locking element is moved into the first position and no more electrical energy can reach the machine tool from the at least one accumulator when a detected acceleration value reaches a predetermined threshold value.

[0021] The acceleration sensor can be designed in the form of a gyro sensor.

[0022] Furthermore, the problem can be solved by an accumulator for use in a system with a machine tool.

[0023] According to a further advantageous embodiment, it may be possible for the accumulator to contain at least one acceleration sensor for detecting at least one acceleration value, wherein the at least one acceleration sensor is connected to the locking device, so that the at least one locking element is moved into the first position and no more electrical energy can reach the machine tool from the at least one accumulator when a detected acceleration value reaches a predetermined threshold value.

[0024] Furthermore, the object can be achieved by a machine tool for use in a system with at least one accumulator.

[0025] According to a further advantageous embodiment, it may be possible for the machine tool to contain at least one acceleration sensor for detecting at least one acceleration value, wherein the at least one acceleration sensor is connected to the locking device, so that the at least one locking element is moved into the first position and no more electrical energy can reach the machine tool from the at least one accumulator when a detected acceleration value reaches a predetermined threshold value.

[0026] Furthermore, the object can be achieved by a method for controlling a locking device in a system comprising a machine tool and at least one accumulator as a power supply for the machine tool, wherein the locking device contains at least one actuator for reversibly moving at least one locking element from a first position to a second or third position.

[0027] According to the invention, the method comprises the following steps:

[0028] - detecting at least one acceleration value by an acceleration sensor;

[0029] - comparing the at least one detected acceleration value with at least a first and second threshold value;

[0030] - sending at least one first signal to the actuator for adjusting the locking element from the first to the second position when the at least one detected acceleration value corresponds to the first threshold value; and

[0031] - Sending at least one second signal to the actuator for adjusting the locking element from the first to the third position when the at least one detected acceleration value corresponds to the second threshold value. Further advantages will become apparent from the following description of the figures. The figure illustrates a particularly preferred embodiment of the present invention. The figures, the description, and the claims contain numerous features in combination. Those skilled in the art will expediently consider the features individually and combine them into useful further combinations.

[0032] In the figure, identical and similar components are numbered with the same reference numerals.

[0033] It shows:

[0034] Figure 1 is a side view of a system according to the invention comprising a machine tool and an accumulator;

[0035] Figure 2 is a side view of an accumulator according to the invention with a schematically illustrated locking device in a first position;

[0036] Figure 3 is a side view of the accumulator according to the invention with the schematically illustrated locking device in a second position;

[0037] Figure 4 is a side view of the accumulator according to the invention with the locking device according to a first embodiment in a first position;

[0038] Figure 5 is a side view of the accumulator according to the invention with the locking device according to a first embodiment in a second position;

[0039] Figure 6 is a side view of the accumulator according to the invention with the locking device according to a second embodiment in a first position; and

[0040] Figure 7 shows a side view of the accumulator according to the invention with the locking device according to a second embodiment in a second position. Embodiments:

[0041] Figure 1 shows a system 100 with a machine tool 1 and an accumulator 11 according to an exemplary embodiment.

[0042] In the embodiment shown, the machine tool 1 is designed as a drill. Alternatively, the machine tool 1 can also be designed as a drill, a hammer drill, a saw, a grinder, or the like.

[0043] As indicated in Figure 1, the machine tool 1 designed as a drilling machine essentially contains a machine tool housing 2 with a tool holder 3 and a handle 4.

[0044] The tool holder 3 serves to accommodate and hold a tool 5. In the present embodiment, the tool 5 is a drill. Alternatively, the tool 5 can also be designed as a screw bit.

[0045] Inside the machine tool housing 2, among other components, there is a drive 6, a gear 7a, an output shaft 7b, and a control unit 8. The drive 6 is designed, for example, as a brushless electric motor and serves to generate torque.

[0046] The control unit 8 further contains an acceleration sensor 14 for detecting acceleration values. The acceleration sensor 14 serves in particular to detect or measure accelerations in the event of a fall of the system 100. The acceleration values ​​detected by the acceleration sensor 14 are sent to the control unit 8 and evaluated. The control unit 8 also contains a memory 32 in which threshold values ​​for the acceleration values ​​are stored. When the acceleration sensor 14 detects an acceleration of the system 100, the acceleration value is evaluated using the control unit 8. For this purpose, the detected acceleration value is compared with the threshold values ​​stored in the memory. When a threshold value is reached, a corresponding signal is transmitted from the control unit 8.

[0047] The control unit 8 regulates and controls the functions and behavior of the machine tool 1 and in particular of the drive 6.

[0048] The handle 4 in turn contains an actuating switch 9, an upper end 4a and a lower end 4b. The actuating switch 9 is connected to the control unit 8, so that actuation of the actuating switch 9 leads to activation of the drive 6 or the machine tool 1.

[0049] As also shown in Figure 1, the drive 6, the gear 7a, the output shaft 7b, and the tool holder 3 are arranged relative to one another such that a torque generated by the drive 6 can reach the tool holder 3 via the gear 7a and the output shaft 7b. The torque generated by the drive 6 is ultimately transmitted to the tool 5 via the tool holder 3.

[0050] The machine tool housing 2 further has a top side 2a, a bottom side 2b, a front end 2c and a rear end 2d.

[0051] The tool holder 3 is positioned at the front end 2c. The upper end 4a of the handle 4 is attached to the underside 2b and near the rear end 2d of the machine tool housing 2. A machine tool interface 10 is positioned at the lower end 4b of the handle 4. The machine tool interface 10 serves to detachably connect the machine tool 1 to the accumulator 11.

[0052] According to an alternative embodiment not shown in the figures, the machine tool 1 can also be designed such that it is connected to more than one accumulator 11 as an energy source.

[0053] The accumulator 11 described in the exemplary embodiment can serve in particular as an energy storage device or electrical energy source for the machine tool 1. The accumulator 11 essentially contains a battery housing 12, a number of energy storage elements 13, a storage device 16, a battery interface 22, a locking device 15 and a control device 17. Furthermore, the accumulator 11 contains an acceleration sensor 18 and a distance sensor 19. The distance sensor 19 can also be referred to as a distance sensor or displacement sensor. In the present exemplary embodiments, the distance sensor 19 is designed in the form of a strain gauge. Alternatively or in addition to the strain gauge, the distance sensor 19 can also be designed in the form of a potentiometer sensor, an inductive sensor, a capacitive sensor and / or an inductive sensor (e.g.Differential transformer (LVDT), cross-armature sensor, short-circuit ring sensor, magneto-inductive distance sensor (MDS) or eddy current sensor).

[0054] The acceleration sensor 18 can also be referred to as an accelerometer, acceleration sensor, vibration sensor, oscillation sensor, accelerometer, B-meter, or G-sensor. In the present embodiments, the acceleration sensor 18 is configured as a MEMS acceleration and gyro sensor (MEMS = micro-electro-mechanical system).

[0055] Alternatively or additionally, the acceleration sensor 18 can also be designed as a piezoelectric acceleration sensor, strain gauge, magnetic induction sensor or Ferraris sensor.

[0056] The energy storage elements 13 can also be referred to as rechargeable battery cells. According to an alternative embodiment not shown in the figures, the rechargeable battery 11 can contain only a single energy storage element 13.

[0057] The storage device 16 is positioned inside the battery housing 12 and serves to store and provide data and information.

[0058] The battery interface 22 is used to electrically or electronically connect the battery 11 to the machine tool 1 by means of the machine tool interface 10. For this purpose, the battery interface 22 contains a positive contact P, a negative contact M and a communication contact K. The positive contact P and negative contact M are used to transmit electrical energy from the energy storage elements of the battery 11 to the consumers (in particular the drive 6) of the machine tool 1. The communication contact K, in turn, is used to communicate the control device 17 of the battery 11 with the control unit 8 of the machine tool 1. For the communication between the battery 11 and the machine tool 1, data and information are exchanged in the form of signals.

[0059] The energy storage elements 13 serve to absorb, store, and re-release electrical energy. As indicated in the figures, the energy storage elements 13 are cylindrical in shape and based on lithium-ion technology.

[0060] Alternatively, the energy storage elements 13 can also be based on another suitable technology. The cylindrical shape of the energy storage elements 13 is also optional, so any other suitable shape or geometry can be selected. In particular, it is also possible for the energy storage elements 13 to be designed as pouch cells.

[0061] For the releasable mechanical coupling of the accumulator 11 to the machine tool 1, the system 100 contains a rail device 20. As indicated in the figures, the rail device 20 is positioned between the battery interface 22 and the machine tool interface 10, so that the accumulator 11 can be pushed along the rail device 20 and in the direction of arrow C onto the machine tool 1 and removed (pushed off) from the machine tool 1 again in the direction of arrow D. When the accumulator 11 is coupled to the machine tool 1 using the rail device 20, the positive contact P, the negative contact M, and the communication contact K of the accumulator 11 are in contact with the corresponding positive and negative contacts P, M, and the communication contact K of the machine tool 1. Electrical energy and electrical signals can then reach the machine tool 1 from the accumulator 11.

[0062] The locking device 15 serves to releasably connect the accumulator 11 to the machine tool 1. For this purpose, the locking device 15 essentially contains an actuator 21, an activation device 23 and a locking element 24.

[0063] In Figures 1 to 3, the locking device 15 according to a first embodiment is shown inside the accumulator 11. Alternatively, the locking device 15 according to the first embodiment can also be positioned inside the machine tool 1.

[0064] In the locking device 15 according to the first embodiment, the actuator 21 is designed and positioned such that the locking element 24 can be reversibly moved from a first position to a second position by means of the actuator 21. In Figures 1 and 2, the locking element 24 is shown in the first position. In Figure 3, the locking element 24 is shown in the second position.

[0065] As indicated in Figures 1 and 2, the actuator 21, the activation device 23 and the locking element 24 are arranged and connected to one another in such a way that a corresponding signal can be sent to the actuator 21 by the activation device 23.

[0066] In the present embodiment, the activation device 23 is designed as an input device with an actuation switch. One or more actuation switches can be provided. Actuating the actuation switch transmits a corresponding signal.

[0067] After receiving the predetermined signal, the actuator 21 moves the locking element 24. The actuator 21 can move the locking element 24 either over an entire distance WS or only a part of the distance in direction A or B. In addition, the actuator 21 can move the locking element 24 step by step in one and the same direction A or B, or the actuator 21 moves the locking element 24 in a first direction (ie, for example, direction A) and then in an opposite direction (ie, for example, direction B).

[0068] In Figure 2, the locking element 24 is in the first position, with the locking element 24 being moved by the actuator 21 the entire distance WS in direction A and protruding into a correspondingly designed recess 25 in the machine tool interface 10. Because the locking element 24 protrudes into the recess 25 of the machine tool interface 10, the accumulator 11 cannot be moved in direction D along the rail device 20 and relative to the machine tool 1. The accumulator 11 is thereby hindered in its relative movement to the machine tool 1 or is firmly connected to the machine tool 1.

[0069] To release or remove the accumulator 11 from the machine tool 1, the activation device 23 sends a corresponding signal to the actuator 21. To send the corresponding signal, the actuating switch 9 is pressed again. After receiving the signal, the actuator 21 moves the locking element 24 in direction B over the entire distance WS, so that the locking element 24 no longer protrudes into the recess 25 of the machine tool interface 10. The accumulator 11 is thus no longer blocked in its movement along the rail device 20 and relative to the machine tool 1, so that the accumulator 11 can be pushed away from the machine tool 1 in direction D.

[0070] In Figures 4 and 5, the locking device 15 according to a second embodiment is shown inside the accumulator 11. Alternatively, the locking device 15 according to the second embodiment can also be positioned inside the machine tool 1.

[0071] The actuator 21 according to the second embodiment is designed in the form of a linear drive. The linear drive essentially contains a rack 26 and a worm shaft 27. The rack 26 and the worm shaft 27 are positioned or arranged relative to one another such that the rack 26 can be moved by rotating the worm shaft 27 about a longitudinal axis. When the worm shaft 27 is rotated in a first direction of rotation R, the rack 26 moves in direction D. By rotating the worm shaft 27 in a second direction of rotation R', the rack 26 moves in direction C. As shown in Figures 4 and 5, the worm shaft 27 is connected to the control device 17. The control device 17 is, in turn, connected to the activation device 23. By actuating the activation device 23, a signal is sent to the control device 17 and ultimately to the actuator 21.The rack 26 is connected at one end to the locking element 24 in such a way that the locking element 24 is pushed along an inclined plane of a wedge element 28 when the rack 26 is moved in direction D. As a result, an upper end of the locking element 24 is moved in direction A and into a corresponding recess 25 in the machine tool interface 10, see Figure 4. When the locking element 24 is fully inserted into the recess 25, a relative movement between the accumulator 11 and the machine tool 1 is suppressed. When the worm shaft 27 is rotated in the direction of rotation R', the rack 26 moves in direction C. As a result, the locking element 24 is moved downwards along the inclined plane in direction B and thus completely out of the recess 25.With the aid of the activation device 23, the rack 26 can be repeatedly moved step by step in direction C or repeatedly moved step by step in direction D.

[0072] In Figures 6 and 7, the locking device 15 according to a third embodiment is shown inside the accumulator 11. Alternatively, the locking device 15 according to the third embodiment can also be positioned inside the machine tool 1.

[0073] The actuator 21 according to the third embodiment is also designed in the form of a linear drive. However, the linear drive according to the third embodiment is designed with an electrodynamic operating principle and essentially contains a magnetic push rod 29 and a coil 30. The coil 30 is connected to the control device 17 such that electrical energy can be conducted through the coil 30, so that the magnetic push rod 29 is moved either in direction C or D. One end of the push rod 29 is connected to one end of the locking element 24. The locking element 24 is pivotally mounted about a pivot point 31, so that the locking element 24 is pivoted in the direction of rotation S when the push rod 29 moves in direction C.

[0074] When the push rod 29 moves in direction D, the locking element 24 is pivoted in the direction of rotation S'. As can be seen in Figures 6 and 7, one end of the pivotable locking element 24 moves in direction A and into a recess 25 in the machine tool interface 10 when the push rod 29 rotates in direction C and the locking element 24 rotates in the direction of rotation S, see Figure 6. The accumulator 11 is then firmly connected to the machine tool 1, so that relative movements between the accumulator 11 and the machine tool 1 are prevented.

[0075] When the push rod 29 moves in direction C, the locking element 24 is pivoted in the direction of rotation S. As can be seen in Figures 6 and 7, one end of the pivotable locking element 24 moves in direction B and out of the recess 25 in the machine tool interface 10, see Figure 7. The accumulator 11 is then no longer firmly connected to the machine tool 1, so that the accumulator 11 and the machine tool 1 can be separated from each other.

[0076] The acceleration sensor 18 of the accumulator 11 is connected to the control device 17 so that acceleration values ​​detected by the acceleration sensor 18 can be sent to the control device 17. Threshold or limit values ​​for an acceleration are stored in the memory device 16. When the detected acceleration values ​​reach the predetermined threshold values, a signal is sent from the control device 17 to the actuator 21, so that the locking element 24 is pressed further into the corresponding recess 25 of the machine tool interface 10. The accumulator 11 is thereby connected even more firmly to the machine tool 1.

[0077] The distance sensor 19 is positioned on an upper side surface 33 of the battery housing 12. When the battery 11 is connected to the machine tool 1, the distance sensor 19 is positioned between the battery 11 and the machine tool 1 such that the distance between the battery 11 and the machine tool 1 can be detected in the form of distance values ​​(e.g., in millimeters (mm)). Threshold or limit values ​​for a distance between the battery 11 and the machine tool 1 are stored in the memory device 16. When the detected distance values ​​reach the predetermined threshold values, a signal is sent from the control device 17 to the actuator 21, so that the locking element 24 is pressed further into the corresponding recess 25 of the machine tool interface 10. The battery 11 is thereby connected even more firmly to the machine tool 1.

[0078] Furthermore, the distance sensor 19 can serve to activate the actuator 21 and consequently the locking element 24 when the accumulator 11 assumes a specific position relative to the machine tool 1. In other words, when the accumulator 11 has been fully pushed onto the rail device 20 and has assumed a correct position or arrangement relative to the machine tool 1, this can be detected by the distance sensor 19.

[0079] As also shown in Figures 1 to 3, the actuator 21 is also connected to the control unit 8 via a line 34 so that signals from the control unit 8 can be received. In the event of a sudden and relatively high acceleration of the system 100, a value for the acceleration (i.e., acceleration value) is detected with the aid of the acceleration sensor 14 of the machine tool 1. In the control unit 8 of the machine tool 1, the detected acceleration value is compared with the threshold values ​​stored in the memory of the control unit 8. If, based on the comparison, it can be determined that the detected acceleration value reaches a predetermined threshold value, a corresponding signal is sent from the control unit 8 via the line 34 to the actuator 21 of the locking device 15.Based on the received signal, the actuator 21 moves the locking element 24 further in direction A, so that the accumulator 11 is pressed further into the rail device 20 and is thus more firmly connected to the machine tool 1. As a result, relative movements between the accumulator 11 and the machine tool 1 are prevented.

[0080] Furthermore, an acceleration acting on the machine tool 1 can be compared with an acceleration acting on the accumulator 11. For this purpose, the acceleration value detected by the acceleration sensor 14 of the machine tool 1 is compared with the acceleration value detected by the acceleration sensor 18 of the accumulator 11. The acceleration value for the machine tool 1 is sent in the form of a signal via line 34 to the control device 17 of the accumulator 11. The control device 17 also receives the acceleration values ​​from the acceleration sensor 18 of the accumulator 11. By comparing the acceleration values ​​of the accumulator 11 and the machine tool 1, it can be determined whether a difference between the respectively detected acceleration values ​​corresponds to a predetermined threshold or limit value stored in the memory device 16.If the determined difference corresponds to the predetermined threshold or limit value, this means that the machine tool 1 and the accumulator 11 are experiencing excessively high differential accelerations (e.g., in the form of vibrations), which could lead to damage. As a result, a signal is sent from the control device 17 to the actuator 21, causing the locking element 24 to be pressed further and with greater force into the recess 25 of the machine tool interface 10. This counteracts relative movement and differential accelerations between the accumulator 11 and the machine tool 1.

[0081] According to a further embodiment, a voltage measuring device 35 is contained in the accumulator 11 for detecting the electrical voltage of the energy storage elements 13. The voltage measuring device 35 is connected to the control device 17 such that detected voltage values ​​can be sent from the voltage measuring device 35 to the control device 17. Threshold or limit values ​​are stored in the storage device 16. One type of threshold value defines a minimum voltage of the energy storage elements 13. When a detected voltage value reaches the threshold value that defines a minimum electrical voltage of the energy storage elements 13, a signal is sent from the control device 17 to the actuator 21, whereby the locking element 24 is removed from the recess 25 of the machine tool interface 10.The accumulator 11 is thereby released from the machine tool 1, so that a user of the machine tool 1 is shown a minimum voltage of the energy storage elements 13.

[0082] List of reference symbols

[0083] 100 systems

[0084] 1 machine tool

[0085] 2 machine tool housings

[0086] 3 tool holder

[0087] 4 Handle

[0088] 4a upper end of the handle

[0089] 4b lower end of the handle

[0090] 5 tools

[0091] 6 Drive

[0092] 7a Gearbox

[0093] 7b Output shaft

[0094] 8 Control unit

[0095] 9 operating switches

[0096] 10 Machine tool interface

[0097] 11 Accumulator

[0098] 12 battery housing

[0099] 13 Energy storage element

[0100] 14 Machine tool acceleration sensor

[0101] 15 Locking device

[0102] 16 Storage device

[0103] 17 Control device

[0104] 18 Accelerometer of the accumulator

[0105] 19 Distance sensor

[0106] 20 rail device

[0107] 21 Actuator

[0108] 22 Battery interface

[0109] 23 Activation device

[0110] 24 Locking element

[0111] 25 recess

[0112] 26 Rack

[0113] 27 Worm shaft 28 Wedge element

[0114] 29 Push rod

[0115] 30 coil

[0116] 31 Pivot point 32 Machine tool memory

[0117] 33 upper side of the battery housing

[0118] 34 Line

[0119] 35 Voltage measuring device P positive contact

[0120] M negative contact

[0121] K Communication contact

[0122] WS route

Claims

Patent claims System (100) with a machine tool (1) and at least one accumulator (11) as an energy supply for the machine tool (1) with at least one energy storage element (13), containing a locking device (15) with at least one locking element (24) for releasably connecting the at least one accumulator (11) to the machine tool (1), characterized in that the locking device (15) contains at least one actuator (21) for reversibly moving the at least one locking element (24) from a first position to a second position, wherein in the first position the accumulator (11) is movable relative to the machine tool (1) and in the second position the accumulator (11) is immovably connected to the machine tool (1). System (100) according to claim 1, characterized in that the at least one actuator (21) can be activated via an activation device (23).System (100) according to claim 1 or 2, characterized in that the at least one actuator (21) can be activated via at least one sensor (14, 18, 19). System (100) according to at least one of claims 1 to 3, characterized in that the locking device (15) contains at least one drive (6) for translationally moving the at least one locking element (24). System (100) according to at least one of claims 1 to 4, characterized in that at least one acceleration sensor (14, 18) is included for detecting at least one acceleration value, wherein the at least one acceleration sensor (14, 18) is connected to the locking device (15), so that the at least one locking element (24) is moved into the first position and no more electrical energy is drawn from the at least one accumulator. (11) can reach the machine tool (1) when a detected acceleration value reaches a predetermined threshold value.

6. Accumulator (11) for use in a system (100) with a machine tool (1) according to at least one of claims 1 to 5.

7. Accumulator (11) according to claim 6, characterized in that at least one acceleration sensor (18) is included for detecting at least one acceleration value, wherein the at least one acceleration sensor (18) is connected to the locking device (15) so that the at least one locking element (24) is moved into the first position and no more electrical energy can reach the machine tool (1) from the at least one accumulator (11) when a detected acceleration value reaches a predetermined threshold value.

8. Machine tool (1) for use in a system (100) with at least one accumulator (11) according to at least one of claims 1 to 5.

9. Machine tool (1) according to claim 8, characterized in that at least one acceleration sensor (14, 18) is included for detecting at least one acceleration value, wherein the at least one acceleration sensor (14, 18) is connected to the locking device (15) so that the at least one locking element (24) is moved into the first position and no more electrical energy can reach the machine tool (1) from the at least one accumulator (11) when a detected acceleration value reaches a predetermined threshold value.

10. A method for controlling a locking device (15) in a system (100) comprising a machine tool (1) and at least one accumulator (11) as a power supply for the machine tool (1), wherein the locking device (15) contains at least one actuator (21) for reversibly moving at least one locking element from a first position to a second or third position, characterized by the method steps: - detecting at least one acceleration value by an acceleration sensor (14, 18); - comparing the at least one detected acceleration value with at least a first and second threshold value; - transmitting at least a first signal to the actuator (21) for setting the locking element (24) from the first to the second position when the at least one detected acceleration value corresponds to the first threshold value; and - transmitting at least one second signal to the actuator (21) for adjusting the locking element (24) from the first to the third position when the at least one detected acceleration value corresponds to the second threshold value.

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