Rechargeable battery unit with battery cells

Abstract

Rechargeable battery unit (1) comprising a grip casing (2) having an operating latch (3), an insertion shaft (4) having at least one power and / or data interface (5), and at least one battery cell (10), wherein the insertion shaft (4) protrudes out of the grip casing (2) along an insertion axis (11), wherein the at least one battery cell (10) is arranged in the insertion shaft (4) and extends into the grip casing (2), wherein a peripheral cooling-air gap (8) is formed around the insertion shaft (4) in an interior of the grip casing (14), wherein the operating latch (3) protrudes into the peripheral cooling-air gap (8) and wherein the grip casing (2) finishes with a radially inwardly directed collar (13) around the insertion shaft (4). The invention also proposes a set comprising such a rechargeable battery unit (1) and at least one suitably designed charging device (17) and a suitably designed discharging device (22).

Description

[0001] Accumulator unit with battery cells

[0002] The invention relates to a battery unit with battery cells for a household appliance or a universal device.

[0003] Rechargeable battery units are used in applications requiring rechargeable power sources. For example, they are used in mobile, portable, and especially handheld devices. The advantage of rechargeable battery units lies in their decentralized power source, eliminating the need for a power cable permanently connected to a power outlet. Another advantage is that while one battery unit is in use in a device, another can be charged simultaneously, eliminating the need for work interruptions to recharge batteries. The rechargeable battery units can be removed and locked into place within the device, ensuring they are securely positioned during use.

[0004] The battery units can be locked into the device in such a way that they become part of the device's external appearance. Often, the device has a slot that is exposed when the battery unit is removed, allowing the battery unit to be easily inserted into the device without requiring any further modifications.

[0005] During operation, the battery cells in the accumulator unit can generate heat. Especially during continuous use, the battery cells can heat up considerably. Such heating can lead to damage to the battery cells or to heat buildup on the exterior of the accumulator unit, which can be uncomfortable for the user. Damage caused by excessive heat can affect the lifespan of the battery cells. Particularly if the accumulator unit is part of the device's exterior, such as a handle or located near a handle, the heat generated by the battery cells, conducted to the exterior of the accumulator unit, can result in an unpleasant user experience.

[0006] Typically, battery units are designed for a specific model or type of device and are therefore only compatible with that device. Consequently, the power stored in a battery unit can often only be used for one type of device. Particularly during extended storage, the battery unit's capacity can decrease, and / or the internal battery cells can be damaged by deep discharge. Therefore, regular use of a battery cell, especially a lithium-ion battery cell, is advantageous to maintain its optimal capacity.

[0007] Based on this, the object of the invention is to at least partially solve the problems described with reference to the prior art. In particular, it aims to provide a method by which an accumulator unit can be easily stored and installed in a device without further structural modifications, and / or by which an accumulator unit, when used in a device, does not experience unpleasant heat generation from the battery cells that could impair its use and / or reduce the battery cells' lifespan. It is also an object of the invention to provide a method by which accumulator units can be used more universally.

[0008] This problem is solved by the features of the independent claims. Further advantageous embodiments of the invention are specified in the dependent claims. It should be noted that features listed individually in the claims can be combined with one another in any technologically meaningful way and define further embodiments of the invention. Furthermore, the features specified in the claims are further specified and explained in the description, which also presents further preferred embodiments of the invention.

[0009] To solve this problem, an accumulator unit is provided, comprising a handle housing with an actuating latch, an insertion shaft with at least one power and / or data interface, and at least one battery cell. The insertion shaft projects from the handle housing along an insertion axis. The at least one battery cell is arranged within the insertion shaft and extends into the handle housing. A circumferential cooling air gap is formed around the insertion shaft in an interior space of the handle housing. The actuating latch projects into this circumferential cooling air gap. The handle housing is sealed around the insertion shaft with a radially inward-facing collar.

[0010] The accumulator unit can be used to store energy. Specifically, the accumulator unit has at least one accumulator (battery cell) that can be electrically charged and discharged. This allows the accumulator unit to be used to operate a device remotely using the stored electrical energy.

[0011] When using the accumulator unit in a device, the handle and / or the handling area of ​​the device can be designed to incorporate the accumulator unit. The accumulator unit can be integrated into the handle of the device. In particular, the handle housing is designed so that a person can grasp and hold the accumulator unit by the handle housing. Preferably, the handle housing is essentially round. Particularly preferably, the handle housing is designed as a cylinder with a diameter of 30 mm to 60 mm, so that it can be easily gripped by the operator's hand.

[0012] The actuating bolt is arranged in the handle housing. In particular, the actuating bolt is arranged so that it can be actuated when the handle housing is grasped with the fingers of the same hand that is gripping the handle housing. Preferably, the actuating bolt protrudes (radially) from an outer surface of the handle housing, and most preferably from the rounded side of the cylinder of the handle housing. The actuating bolt may have a section protruding from the handle housing at which it can be actuated.

[0013] The insertion shaft is preferably connected to the handle. The insertion shaft can have the form of an extruded component that has essentially or predominantly the same external dimensions and geometry along its (axial) length, so that the entire insertion shaft can be inserted into a receptacle or receiving shaft along its entire length. The insertion shaft can have a width that corresponds to a maximum of 75%, in particular approximately 60%, of its length. Thus, the total length of the accumulator unit can be composed of the height of the handle housing and a length of the insertion shaft that protrudes from the handle housing.

[0014] The at least one power and / or data interface can be arranged on or in the insertion shaft. Preferably, the power and / or data interface is recessed into the insertion shaft. Electrical current and / or a data stream can be transmitted via the power and / or data interface. Data streams that can be transmitted via the power and / or data interface can, for example, convey information about current flow, charging capacity, charging time, battery health, temperature, etc., to the battery unit and / or from there to a device connected to the battery unit.

[0015] The at least one battery cell can be cylindrical. Preferably, the battery cell is arranged in the insert shaft. Preferably, several, in particular three, battery cells are arranged in one insert shaft. Preferably, cylindrical 18650 lithium-ion cells are housed in this way. The battery cells preferably have a voltage of 3.6 V [volts] and a capacity of 2,000–3,000 mAh [milliampere-hours]. Preferably, the battery unit thus has a total voltage of 10.8 V and a total capacity of 2,000–3,000 mAh.

[0016] Preferably, the insertion shaft projects from the handle housing along the insertion axis such that a portion (of its length) is located within the handle housing. Particularly preferably, the insertion axis extends as the longitudinal axis of the insertion shaft parallel to a central axis of the handle housing. The central axis of the handle housing preferably runs along the height of the handle housing. The insertion axis preferably runs along the length of the insertion shaft. The insertion axis can be considered an axis to which all battery cells are equidistant. The battery cells are thus preferably arranged parallel to the insertion axis along their length.

[0017] The battery cells are preferably arranged as close together as possible within the insertion shaft. One outer surface of the insertion shaft is preferably adapted to the geometry of the battery cells. The insertion shaft particularly preferably has a prismatic base with rounded corners. The battery cells are preferably arranged in the corners of the prismatic insertion shaft.

[0018] The circumferential cooling air gap formed around the insertion shaft inside the handle housing allows heat from the battery cells to be dissipated. During operation, the battery cells can generate increased heat, causing them to overheat. To maximize battery cell lifespan, it is beneficial to minimize heat buildup and prevent heat accumulation. This also prevents heat from being transferred to a user holding the battery unit by the handle housing, thus avoiding an uncomfortable user experience. Furthermore, the circumferential cooling air gap reduces or even prevents the battery unit from being gripped tightly by hand when using the handle housing, thereby preventing heat from being transferred to the battery cells.Heat can build up between the battery cells and the hand and not be properly dissipated. The surrounding cooling air gap is designed as an annular gap, providing space for circulating airflow between the outer surface of the handle housing. This allows waste heat from the battery cells to enter the gap and be dissipated. It also prevents heat from the hand gripping the handle housing from being transferred to the battery cells and / or prevents heat from the battery cells from being impeded or trapped.

[0019] The operating latch can be designed as an actuation mechanism on the handle housing. It is possible that only a push button protrudes from the handle housing as part of the actuation mechanism and can be actuated from the handle housing. The operating latch can be in contact with the surrounding cooling air gap, so that it can be cooled or thermally (predominantly) decoupled from the waste heat of the battery cells.

[0020] The handle housing is sealed with a radially inward-facing collar around the insertion shaft. This collar limits or seals the surrounding cooling air gap (towards the insertion shaft). This prevents heat from the cooling air gap from being transferred to a device containing the battery unit. It also prevents heat from the device containing the battery unit from being conducted into the cooling air gap. Furthermore, the collar can provide a stop surface on the handle housing. This allows the battery unit's insertion shaft to be inserted into a device up to the collar and then stop against it. In this way, the battery unit can only be inserted and installed in a device up to the handle housing.

[0021] The insertion axis can be arranged (laterally or radially) offset from the central axis of the handle housing. It is also possible for the insertion shaft to be arranged parallel to and offset from the handle housing. Such an arrangement allows the actuating mechanism to be positioned next to the protruding insertion shaft within the handle housing. Furthermore, shifting the insertion axis relative to the central axis of the handle housing can also shift the center of gravity of the accumulator unit.

[0022] The at least one battery cell may extend 20% to 40% into the handle housing. It is possible that the battery cell does not extend over the entire length of the insertion shaft. For example, one end of the battery cell may extend to and touch an (upper) edge or cover of the insertion shaft that terminates in the handle housing. Furthermore, the opposite end of the battery cell may extend to an opposite (lower) edge or base of the insertion shaft without touching it.

[0023] In the exposed area below, connection components and / or (electrical or electronic) components for battery management can be arranged. In particular, the battery management components can include a circuit board with sensors that can read various measured values ​​from the battery cells, such as capacity, charging time, battery health, temperature, etc. The connection components can be configured to transmit electrical current and / or data from the battery management system and / or electrical (measurement) signals. It is particularly possible to position or replace the battery cells within the battery unit independently of the connection components or the battery management system. The battery management system can regulate the current flowing in and out of the battery cells.This ensures that the battery cells are not discharged or charged too quickly during a discharge or charging process. It also allows the battery cells to operate independently of the power requirements of external devices during discharge and / or charging, thus preventing damage. Furthermore, the area at the end protruding into the handle housing and / or at the opposite end of the insertion shaft can be enlarged (expansion) or reduced (tapering) to shift the center of gravity of the battery unit (particularly laterally). This allows for a shift in the center of gravity of the entire device when the battery unit is used. This can, for example, improve the device's handling and / or enable it to stand upright independently.

[0024] The circumferential cooling air gap can be limited radially by an outer surface of the insertion shaft and an inner surface of the handle housing (circumferentially). It is possible that the cooling air gap is not visible from the outside, thus eliminating the need for any further cooling measures.

[0025] A maximum of 30% of the surrounding cooling air gap should be occupied by components of the insertion shaft and the handle housing. Preferably, less than 20% of the gap volume defined by the outer surface of the insertion shaft and the inner surface of the handle housing is occupied by components or filled with attachments. Attachments are, for example, elements of the insertion shaft and / or the handle housing that are molded or mounted there. It is possible to design the surrounding cooling air gap so that it largely forms a cavity through which waste heat can be dissipated or circulated. This prevents the cavity from being too small or completely blocked, thus reducing or preventing its heat-dissipating properties.

[0026] It is possible for the circumferential cooling air gap to have a gap width of at least 2.0 mm [millimeters]. Preferably, the gap width is in the range of 5.0 mm to 10.0 mm. The gap width can be determined perpendicular or radially to the central axis of the handle housing. The cooling air gap can be designed to form a cavity that allows heat dissipation. This cooling air gap prevents the handle housing from being too large. In this way, the handle housing can be adapted to the geometry of a device into which the accumulator unit is installed. Such a gap width also ensures a handle housing diameter that an average person can comfortably grip with one hand. Even if the gap width varies circumferentially, the minimum value in the circumferential direction must not be undercut.

[0027] It is possible for the circumferential cooling air gap to have a gap height of at least 10.0 mm [millimeters]. Preferably, the gap height is in the range of 15.0 mm to 30.0 mm. The gap height can be determined parallel or axially to the central axis of the handle housing. Such a gap height allows the circumferential cooling air gap to adjoin the battery cells in the insert shaft in an advantageous area, thus ensuring a sufficient cooling surface on the insert shaft. This enables the waste heat to be dissipated via the area of ​​the battery cells adjacent to the circumferential cooling air gap.

[0028] The cooling air gap preferably encompasses 25 to 50% of the volume enclosed by the handle housing.

[0029] Opposite the handle housing, the insertion shaft can terminate in a base. This base can accommodate at least one power and / or data interface. Thus, when the battery unit is inserted into a receptacle for the insertion shaft, the power and / or data interface can be connected to a corresponding connector. With this placement of the power and / or data interface, the battery unit can be connected to a corresponding connector without the risk of personal contact with the connectors.

[0030] The actuating bolt can include a hook that can be pivoted by means of a push button located on the outside of the handle housing. Preferably, only a single actuating bolt or a single push button is provided. The hook can, for example, extend (partially) parallel to the central axis of the handle housing from the collar. The hook can be L-shaped and have a shoulder that extends perpendicularly or radially to the central axis of the handle housing towards the outside below the handle housing. The hook can be pivoted towards the central axis of the handle housing. When the hook pivots, its parallelism to the central axis of the handle housing is preferably maintained. The push button is preferably actuated by pressing it into the handle housing. It is possible that the push button is spring-loaded when actuated and is pressed against the resistance of the spring.The push button can be returned to its starting position by the spring when released.

[0031] At least one guide rail can be provided on the outside of the insertion shaft, parallel to the insertion axis. The guide rail may facilitate the insertion of the accumulator unit into a device. Preferably, the at least one guide rail is arranged at each rounded corner of the insertion shaft. The guide rail is preferably an elongated projection that extends along the entire length of the insertion shaft.

[0032] It is possible that the accumulator unit, in particular the insertion shaft or the handle housing, has at least one visible and / or tactile marking that indicates an insertion direction of the accumulator unit parallel to the insertion axis. The insertion direction preferably points from the handle housing towards the insertion shaft.

[0033] The accumulator unit can include means for the controlled charging and discharging of at least one battery cell. These means can include components for data processing and / or for controlling the charging and discharging processes of the battery cells. The means can be part of a battery management system, which is designed in particular as described above. A charging device also contributes to solving the problem, comprising at least a slot for the insertion shaft of the accumulator unit proposed here, a latch for the actuating latch of the accumulator unit, and a voltage connection.

[0034] The battery unit can be inserted into the slot using its insertion shaft. The at least one power and / or data interface can be connected to the charging device's connection components. The charging device can be supplied with electrical current via the voltage connection. The electrical current can be transmitted via the connection components to the at least one power and / or data interface. This allows the battery cells of the battery unit to be charged.

[0035] It is possible that the charging device has a charge management system that can exchange data with the battery management system of the accumulator unit via at least one power and / or data interface. This allows the battery cells to be charged in such a way that the charging process is monitored and, if necessary, potential damage is prevented. In particular, the charge management system can regulate the electrical current so that the battery cells are charged, for example, only up to a maximum capacity, at a maximum voltage, and / or at a maximum temperature.

[0036] It is possible to install the battery unit in a removable manner within the charging device's slot. The operating latch's hook may engage in the latch recess. By pressing the push button, the hook can be released from the latch recess, allowing the battery unit to be removed from the charging device.

[0037] A discharge device also contributes to solving the problem, comprising at least a slide-in receptacle for the slide-in shaft of the proposed accumulator unit, a latch receptacle for the actuating latch of the accumulator unit, and a universal power and / or data interface for external devices.

[0038] The battery unit can be inserted into the slot using its insertion shaft. The at least one power and / or data interface can be connected to the discharge device's connection components. External devices can be connected to the universal power and / or data interface. Preferably, the universal power and / or data interfaces are of the USB type. However, it is possible for the universal power and / or data interface to be equipped with any type of USB interface.

[0039] In particular, this makes it possible to connect an external device, such as a mobile phone, tablet, and / or PC, to the universal power and / or data interface of the discharge device. The external device can be charged using power from the battery cells of the accumulator unit.

[0040] It is also possible that the discharge device includes a discharge management system that can exchange data with the battery management system of the accumulator unit via at least one power and / or data interface. The discharge management system can also communicate with an external device connected to the universal power and / or data interface. This allows the battery cells to be charged in such a way that the discharge process is monitored and, if necessary, impending damage is prevented. In particular, the discharge management system can regulate the electrical current so that the battery cells or the external device are only discharged or charged, for example, up to a minimum or maximum capacity, at a maximum voltage, and / or at a maximum temperature.

[0041] It is possible to install the battery unit in the discharge device's slot in a removable manner. The release latch may engage in the latch recess. By pressing the push button, the latch can be released from the latch recess, and the battery unit can then be removed from the discharge device. If a battery unit is removed from the discharge device while an external device is being charged via the universal power and / or data interface, the charging process of the external device can be interrupted without supplying power to the discharge device. When the battery unit, or another battery unit, is reinserted into the discharge device, the charging process of the external device can be resumed.

[0042] In conjunction with the discharge device, the battery unit can be set up and / or used as a so-called power bank.

[0043] The charging and discharging devices offer particular advantages and alleviate the problems mentioned at the outset. The specific advantages and design features described for the accumulator unit are applicable and transferable to the described charging and discharging devices, and vice versa.

[0044] Furthermore, a set is proposed comprising a battery unit of the type proposed here, as well as at least one charging device configured to receive and electrically charge the battery unit, and a discharging device configured to receive and electrically discharge the battery unit. The charging device and / or discharging device may be designed as proposed here.

[0045] In particular, the proposed accumulator unit, charging device, and discharging device form a coordinated and integrated set. The set may include at least one battery-operated kitchen and / or household appliance, which serves as a discharge device or as an additional component. The set is characterized, in particular, by the fact that the accumulator unit's insertion shaft can interact with matching (uniform) insertion slots, allowing the accumulator unit to be inserted in such a way that only the handle housing protrudes from these slots.

[0046] The invention and its technical context are explained in more detail below with reference to the figures. The illustrations are schematic and not intended to demonstrate scale relationships. The explanations given with reference to individual details of the figure can be extracted and freely combined with information from the preceding description, unless a person skilled in the art necessarily derives otherwise, or such a combination is explicitly excluded. Where the same reference numerals are used for components in different figures, the respective descriptions or properties can be used for characterization. The figures show:

[0047] Fig. 1: a perspective view of an accumulator unit,

[0048] Fig. 2: a perspective view of the accumulator unit,

[0049] Fig. 3: a sectional view of the accumulator unit,

[0050] Fig. 4: a perspective view of the accumulator unit,

[0051] Fig. 5: a perspective partial view of the accumulator unit,

[0052] Fig. 6: a perspective view of a charging device,

[0053] Fig. 7: a sectional view of the charging device with built-in accumulator unit,

[0054] Fig. 8: a perspective view of a discharge device, and Fig. 9: a perspective view of the discharge device with built-in accumulator unit.

[0055] Fig. 1 shows a perspective view of the accumulator unit 1. A slide-in shaft 4 extends from a handle housing 2. An actuating latch 3 is arranged in the handle housing 2. A push button 19 of the actuating latch 3 protrudes from an outer surface of the handle housing 2. A hook 9 of the actuating latch 3 extends from a collar 13 arranged perpendicular to it. The slide-in shaft 4 has a base 15. Five power and / or data interfaces 5 are arranged in the base 15. An outer power and / or data interface 5 has a positive current connection. Another opposing outer power and / or data interface 5 has a negative current connection. A middle power and / or data interface 5 has an NTC resistor or a thermistor.A data port is arranged between the middle power and / or data interface 5 and the outer power and / or data interface 5, which is a positive power port. Another data port is arranged between the middle power and / or data interface 5 and the outer power and / or data interface 5, which is a negative power port.

[0056] Fig. 2 shows another perspective view of the accumulator unit 1. The handle housing 2 has a cover 12 which borders the handle housing 2 opposite the collar 13.

[0057] Fig. 3 shows a sectional view of the accumulator unit 1. Three battery cells 10 are visible in the insertion shaft 4, projecting into the handle housing 2. The battery cells 10 are arranged in an interior space of the insertion shaft 16. The insertion shaft 4 projects into an interior space of the handle housing 14. Fig. 3 further shows how a circumferential cooling air gap 8 is enclosed by the collar 13 and the cover 12 and extends in a ring shape around the insertion shaft. Fig. 4 shows a perspective view of the accumulator unit 1 from below. The insertion shaft 4 has two guide rails 6 by which the insertion shaft 4 can be guided in an insertion recess 18 (not shown).

[0058] Fig. 5 shows a perspective side view of the accumulator unit 1. The insertion shaft 4 is not shown. The battery cells 10, which protrude into the handle housing 2, are visible. It is also visible that a central axis of the handle housing 7 is offset from an insertion axis 11 of the insertion shaft 4. The power and / or data interfaces 5, which protrude into the base 15 of the insertion shaft 4 (also not shown), are also visible.

[0059] Fig. 6 shows a perspective view of a charging device 17. The charging device 17 has a slot 18 into which the accumulator unit 1 can be installed. A locking mechanism 20 is arranged in the slot 18, which can be used to secure the hook 9 of the accumulator unit 1. The charging device 17 also has a voltage connection 21, which can be used to supply the charging device 17 with current. A charge level indicator 24, facing away from the plane of the image and therefore not visible, is also provided on the front. An example of a charge level indicator 24 is shown in Fig. 9 on the discharging device 22.

[0060] Fig. 7 shows a sectional view of the charging device 17 with integrated accumulator unit 1. It can be seen how the hook 9 engages in the locking receptacle 20. It can also be seen how the hook 9 can be retracted by pressing the push button 19, thus releasing the accumulator unit 1 from the charging device 17. The connection of the power and / or data interfaces 5 to the charging device 17 is also shown.

[0061] Fig. 7 also illustrates the internal structure of a battery unit 1 with the insertion shaft 4, the battery cells 10, the handle housing 2 and the surrounding cooling air gap 8. It can also be seen that battery management components 25 are provided in an area between the battery cells 10 and the power and / or data interfaces 5 in the insertion shaft 4, for example on a circuit board.

[0062] Fig. 8 shows a perspective view of a discharge device 22. The discharge device 22 has a slide-in recess 18 into which the accumulator unit 1 can be installed. A locking receptacle 20 is arranged in the slide-in recess 18, with which the hook 9 of the accumulator unit 1 can be locked. Furthermore, two universal

[0063] Power and / or data interface 23 is arranged, to which an external device can be connected.

[0064] Fig. 9 shows a perspective view of the discharge device 22 with integrated accumulator unit 1. An (optical) charge level indicator 24 is also shown.

[0065] (e.g. with a plurality of LEDs) provided on the discharge device 22.

[0066] Reference sign

[0067] 1 accumulator unit

[0068] 2 handle housings

[0069] 3 operating latches

[0070] 4 Insert shaft

[0071] 5 Power and / or data interface

[0072] 6 guide rail

[0073] 7 Central axis of the handle housing

[0074] 8 circumferential cooling air gap

[0075] 9 hooks

[0076] 10 battery cells

[0077] 11 Insertion axis

[0078] 12 lids

[0079] 13 collars

[0080] 14 Interior of the handle housing

[0081] 15 Floor

[0082] 16 Interior of the insert shaft

[0083] 17 Charging device

[0084] 18 Insert slot

[0085] 19 snap fasteners

[0086] 20 bolt holder

[0087] 21 Voltage connection

[0088] 22 Unloading device

[0089] 23 universal power and / or data interface

[0090] 24 charge level indicator

[0091] 25 Battery management component

Claims

Claims 1. Accumulator unit (1) comprising a handle housing (2) with an actuating latch (3), an insertion shaft (4) with at least one power and / or data interface (5), and at least one battery cell (10), wherein the insertion shaft (4) projects out of the handle housing (2) along an insertion axis (11), wherein the at least one battery cell (10) is arranged in the insertion shaft (4) and extends into the handle housing (2), wherein a circumferential cooling air gap (8) is formed around the insertion shaft (4) in an interior of the handle housing (14), wherein the actuating latch (3) projects into the circumferential cooling air gap (8) and wherein the handle housing (2) closes off the insertion shaft (4) with a radially inwardly directed collar (13).

2. Accumulator unit (1) according to the previous claim, wherein the insertion axis (11) is arranged offset from a central axis of the handle housing (7).

3. Accumulator unit (1) according to the preceding claim 1 or 2, wherein the at least one battery cell (10) is arranged extending 20% ​​to 40% into the handle housing (2).

4. Accumulator unit (1) according to one of the preceding claims, wherein the circumferential cooling air gap (8) is limited in a radial direction by an outside of the insertion shaft (4) and an inside of the handle housing (2).

5. Accumulator unit (1) according to one of the preceding claims, wherein a maximum of 30% of the circumferential cooling air gap (8) is provided with structures of the insertion shaft (4) and the handle housing (2).

6. Accumulator unit (1) according to one of the preceding claims, wherein the circumferential cooling air gap (8) has a gap width of at least 3.0 mm and is in particular in the range of 5.0 mm to 10.0 mm.

7. Accumulator unit (1) according to one of the preceding claims, wherein the circumferential cooling air gap (8) has a gap height of at least 10.0 mm and is particularly in the range of 15.0 mm to 30.0 mm.

8. Accumulator unit (1) according to one of the preceding claims, wherein the insertion shaft (4) terminates opposite the handle housing (2) with a base (15), wherein the base (15) provides at least one power and / or data interface (5).

9. Accumulator unit (1) according to one of the preceding claims, wherein the actuating latch (3) comprises a hook (9) which can be pivoted by means of a push button (19) which can be actuated on the outside of the handle housing (2).

10. Accumulator unit (1) according to one of the preceding claims, wherein at least one guide rail (6) is provided on the outside of the insertion shaft (4) parallel to the insertion axis (11).

11. Accumulator unit (1) according to one of the preceding claims, wherein this unit comprises means for controlled charging and discharging of the at least one battery cell (10).

12. Charging device (17) comprising a slide-in receptacle (18) for the slide-in shaft (4) of an accumulator unit (1) according to one of the preceding claims, a latch receptacle (20) for its actuating latch (3) and a voltage connection (21).

13. Discharge device (22), comprising a slide-in receptacle (18) for the slide-in shaft (4) of an accumulator unit (1) according to one of the Claims 1 to 11, a latch receptacle (20) for its actuating latch (3) and a universal power and / or data interface (23) for external devices.

14. Set comprising a battery unit (1) according to any one of claims 1 to 11 and at least one charging device (17) configured for receiving and electrically charging the battery unit (1), and a discharging device (22) configured for receiving and electrically discharging the battery unit (1).

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