WO2019063212A1

WO2019063212A1 - Battery pack

Info

Publication number: WO2019063212A1
Application number: PCT/EP2018/072643
Authority: WO
Inventors: Florian Kneer
Original assignee: Robert Bosch Gmbh
Priority date: 2017-09-29
Filing date: 2018-08-22
Publication date: 2019-04-04
Also published as: CN111148604A; DE102017217495A1

Abstract

The invention relates to a battery pack, in particular a hand-held power tool battery pack, comprising a housing in which at least one battery cell is arranged, and comprising an mechanical interface comprising at least one connection element via which the battery pack can be mechanically connected to a consumer. According to the invention, the mechanical interface is designed such that it is at least partly exchangeable.

Description

description

title

battery Pack

State of the art

From DE 10 2015 207 730 AI a mechanical interface for connecting a battery pack with a consumer is known. The use of battery packs in ever more powerful devices, which have an increased energy requirement, also increases the weight of the battery packs. Due to the increased weight of the battery pack, there are new demands on the mechanical interface of the battery pack and the consumer. By wear or in the case of a shock-like load, the mechanical interface can be damaged in such a way that the mechanical interface can no longer fulfill its intended function and thus the battery pack or the consumer must be replaced, which is associated with high costs.

Disclosure of the invention

The invention relates to a battery pack, in particular a hand tool machine battery pack, having a housing in which at least one battery cell is arranged, with a mechanical interface comprising at least one connecting element, via which the battery pack can be mechanically connected to a load. It is proposed that the mechanical interface is at least partially exchangeable. Advantageously, this allows the mechanical interface to be easily replaced in the event of damage, as a result of which the overall service life of the battery pack can be increased.

In particular, the battery pack is part of a system that is composed of the battery pack and the consumer, wherein the consumer is supplied with energy during operation via the battery pack. For the production of a chanic connection between the battery pack and the consumer, both the battery pack and the consumer each have a mechanical interface that correspond to each other. Furthermore, it is also conceivable that the system comprises an adapter which comprises at least two mechanical interfaces, via which the adapter is mechanically connectable to the battery pack and the consumer.

An electrical connection of the battery pack with the consumer via an electrical interface of the battery pack and an electrical interface of the consumer, which correspond to each other. In particular, via the electrical interfaces of the battery pack and the consumer, the at least one battery cell of the battery pack can be electrically connected to a drive unit of the consumer. The battery cell may be formed as a galvanic cell having a structure in which a cell pole comes to lie at one end and another cell pole at an opposite end. In particular, the battery cell has a positive cell pole at one end and a negative cell pole at an opposite end. Preferably, the battery cells are designed as NiCd or NiMh, particularly preferably as lithium-based battery cells. The battery voltage of the battery pack is usually a multiple of the voltage of a single battery cell and results from the circuit

(parallel or serial) of the battery cells. With standard battery cells with a voltage of 3.6 V, this results in exemplary battery voltage of 3.6 V, 7.2 V, 10.8 V, 14.4 V, 18 V, 36 V, etc. Preferably, the battery cell as formed at least substantially cylindrical round cell, wherein the cell poles are arranged at the ends of the cylindrical shape. In particular, the electrical interface comprises at least two electrical contact elements which are designed to transmit energy. Alternatively or additionally, the electrical interface may have a secondary charging coil element for inductive charging. In addition, the electrical interface may comprise further contact elements, which are designed to provide additional information, preferably via a

Electronics to be transmitted to the consumer. This may be, for example, a state of charge of the battery pack, a temperature within the battery pack, a coding or a residual capacity of the battery pack. It is conceivable that the electronics regulates or controls the charging and / or discharging process of the battery pack. The electronics can be have at least one circuit board, a computing unit, a transistor, a capacitor and / or a memory. The electronics can also have one or more sensor elements, for example for determining the temperature within the battery pack. The electronics may alternatively or additionally comprise an electrical coding element, such as a coding resistor.

The consumer may in particular be designed as a portable device. Preferably, the consumer is designed as a garden implement, such as a lawnmower or hedge trimmer, as a hand tool, such as an angle grinder, a screwdriver, a drill, a hammer drill, etc., or as a measuring tool, such as a laser range finder. Alternatively, it is also conceivable that the consumer can be designed as a radio, as a lamp or as a suction. The battery pack interface is provided in particular for a system comprising a battery pack and a consumer, in which the weight portion of the battery pack is at least 1/8 of the total weight, preferably at least V _{4 of} the total weight, preferably at least 1/3 of the total weight. With such weight ratios, the high weight of the battery packs and the mass inertia of the battery pack can result in a very high load on the mechanical connection in the event of a system drop, which can lead to irreversible damage to the mechanical interface. The mechanical interface of the battery pack and the corresponding mechanical interface of the consumer are in particular designed to enter into a non-positive and / or positive connection with each other. The

Connection is preferably detachable, in particular tool-less and non-destructive detachable. Preferably, at least one of the mechanical interfaces comprises a fixing element, via which the battery pack can be fixed to the load. Preferably, the fixation is releasable via an actuating element, wherein the actuating element can be arranged on the battery pack and / or on the consumer. The actuator may be formed, for example, as a button, lever or push button.

Under a mechanical interface, which is at least partially interchangeable, should be understood in particular that at least one of mechanical interface associated component, such as the connecting element, is interchangeable. In particular, the mechanical interface is designed to be completely interchangeable. Preferably, the mechanical

Interface formed at least partially, in particular completely, exchangeable without tools. Alternatively, it is also conceivable that the mechanical interface is at least partially, in particular completely, tool-supported releasably formed. In this context, tool-assisted releasable is to be understood in particular as meaning that a component of the mechanical interface or the mechanical interface can only be detached by means of a commercially available tool, such as a screwdriver, for example, or a special tool that has been specially designed for this use.

Furthermore, it is proposed that the mechanical interface has a bearing surface, and a ratio between the bearing surface of the mechanical interface and a weight of the battery pack is less than 5 cm ² / kg, in particular less than 1 cm ² / kg, preferably less than 0.5 cm ² / kg. Alternatively, it is also conceivable that the ratio between the bearing surface of the mechanical interface and the weight of the battery pack is in a range between 0.2 cm ² / kg and 0.8 cm ² / kg, preferably in a range between 0.3 cm ² / kg, and 0.5 cm ² / kg. In this context, the support surface should be understood to mean, in particular, the total support surface. Advantageously, a replaceable mechanical interface is installed only in systems in which this is also needed. In this context, a bearing surface of the mechanical interface is to be understood as meaning in particular an area of the battery pack or of the consumer, which is acted on by the load or by the battery pack with a force. In this case, the support surface is aligned during operation of the consumer in normal operation substantially perpendicular to the acting heavy weight force.

Furthermore, it is proposed that the connecting element is non-positively and / or positively connected releasably connected to the housing. Preferably, the connecting element of the mechanical interface of the battery pack is designed for non-positive and / or positive connection with a connecting element of the mechanical interface of the consumer. Advantageously, this can produce a stable connection between the battery pack and the consumer. be presented.

In addition, it is proposed that the connecting element is designed in such a way that the battery pack can be guided by the connecting element to produce the non-positive and / or positive connection with the consumer. The connecting element can be designed, for example, as a guide rail, in particular a linear guide rail, as a guide groove, as a guide rib or the like. In particular, the connecting element has on its outer surface at least one guide surface along which the battery pack can be guided for connection to the consumer. Preferably, the guide surface is at least partially, preferably completely, formed as the support surface. In particular, each connecting element has at least one guide surface, preferably at least two guide surfaces, preferably at least three guide surfaces. The guide surfaces can be spaced apart from one another or adjacent to one another.

Furthermore, it is proposed that the battery pack has at least two connecting elements. Advantageously, thereby the connection can be improved. The connecting elements can be arranged opposite one another, lying one behind the other and / or lying side by side.

Furthermore, it is proposed that the connecting element can be fastened to the housing via at least one fastening element. Advantageously, thereby the connection can be further strengthened. The fastening element is assigned to the mechanical interface. The fastening element is preferably designed as a screw. Alternatively or additionally, the fastening element can also be designed as a spreader rivet, a splint or the like. The connecting element can be detachably formed via the fastening element without tools or preferably with the aid of a tool. The connecting element and / or the fastening element are in particular designed to be non-destructively detachable. Preferably, the connecting element via the fastening element and / or the fastening element is conditionally releasably formed. Under conditionally releasable should be understood in this context in particular, that the connecting element and / or the fastening element are destroyed during release such that a compound of the connecting element with the mechanical interface over the dissolved fastener is no longer possible. The fastening element is preferably secured by a securing element against accidental loosening. The securing element is in particular designed to produce an additional connection between the fastening element and the mechanical interface, preferably the connecting element. The additional compound is preferably an integral connection, in particular an adhesive connection. The securing element can be designed, for example, as a securing varnish, in particular as a threadlocking varnish.

In addition, it is proposed that the connecting element is sealed by a sealing element. Advantageously, an unauthorized replacement can be identified thereby. The sealing element is preferably arranged such that a release of the mechanical interface, in particular a release of the connecting element, has a destruction of the sealing element result. The sealing element can be arranged in the region of the fastening element or in a region in which the connecting element rests in the mounted state on a further component of the mechanical interface. The sealing element can be designed, for example, as a seal, in particular a plastic seal.

Furthermore, it is proposed that the connecting element is made of a material which differs from the housing. Advantageously, this allows the mechanical interface to be selectively reinforced independently of the choice of material of the other housing. In particular, the mechanical

Interface, preferably the connecting element, a higher average tensile strength, as the housing of the battery pack or the consumer. Preferably, the connecting element has a higher tensile strength than the component to which it is attached.

Furthermore, it is proposed that the connecting element is made of a ceramic, a plastic or a metal. Preferably, the metal is a nonferrous metal or a non-ferrous metal alloy based on aluminum, zinc or magnesium. The non-ferrous metal alloy has an iron content which in particular does not exceed 50%. In addition, it is proposed that the connecting element has a coding element for mechanical coding. In this context, a mechanical coding is to be understood in particular to mean a mechanism which is provided by the manufacturer for allowing only certain or intended components or parts of a system to be connected to one another. The mechanical coding has at least one coding element and a corresponding coding element, which may be formed as a component or as an Anformung and / or in a component. The Anformung can for example be formed as a groove, as a protruding nose, as a web, etc. In particular, the coding element for mechanical coding of the connecting element with the battery pack, in particular the housing of the battery pack, preferably the mechanical interface is formed. Advantageously, this ensures that only the manufacturer-provided connecting element with the battery pack is connectable. Furthermore, it is alternatively or additionally also conceivable that the coding element is provided for the mechanical coding of the battery pack with the consumer. The coding element may in particular be formed integrally with the connecting element. Advantageously, a mechanical coding between the battery pack and the consumer can be realized by the shape of the connecting element in a simple manner.

Furthermore, it is proposed that the housing is designed in several parts and comprises an interface housing which has the mechanical interface and an electrical interface via which the battery pack can be mechanically and electrically connected to the load. Preferably, the interface housing comprises the mechanical interface completely and the electrical interface partially. The interface housing may be formed exchangeable, in particular tool-supported exchangeable.

Furthermore, it is proposed that the interface housing has at least one connection element and at least one electrical contact element, wherein the electrical contact element is arranged in particular in a recess of the interface housing. The connecting element may be formed integrally with the interface housing. It is also suggested in that the at least one electrical contact element is positively, positively and / or materially connected to the interface housing. Preferably, the at least one electrical contact element is not detachable or conditionally releasably connected to the interface housing.

In addition, it is proposed that the interface housing is detachably connected via outer fastening elements to the housing, in particular to a main body of the housing. In this context, an external fastening element should be understood to mean, in particular, a fastening element which can be detached from the outside and without partial dismantling of the consumer or of the battery pack. The outer fastening elements are in particular designed as mechanical fastening elements, which connects two non-current-carrying components with each other.

Furthermore, it is proposed that the interface housing, in particular the at least one electrical contact element of the interface housing, is electrically connected via at least one inner fastening element to the battery pack, in particular to the electronics of the battery pack. In this context, an internal fastening element should be understood to mean, in particular, a fastening element which can only be detached after a previous disassembly of another component of the consumer or of the battery pack. In particular, the inner fastening element is designed as an electrical fastening element that connects two current-carrying components with one another. Preferably, the at least one electrical contact element of the interface housing with the electronics of the battery pack or an electrical conductor of the battery pack is electrically connected via the inner fastener.

Furthermore, it is proposed that the outer and / or the inner fastening element is secured by means of a securing element, which is designed to secure the fastening element against loosening. Advantageously, thereby a secure connection can be made.

In addition, it is proposed that the interface housing has at least one sealing element which is designed to form the housing of the battery pack Seal area of the fastener, in particular in the region of the electrical fastener. Advantageously, thereby an effective protection of the electronics of the battery pack from moisture can be realized. The sealing member may be exemplified as a sealing ring, as a stamped seal, as a self-adhesive strip seal, etc.

Furthermore, it is proposed that the electrical contact element can be connected via a cable lug to the battery pack, in particular to the electronics of the battery pack. Alternatively, it is also conceivable that the electrical contact element via a power rail with the battery pack, in particular with the electronics of the battery pack, is connectable.

Furthermore, the invention relates to a system comprising a battery pack with a mechanical interface and a consumer with a mechanical interface, wherein at least one of the mechanical interfaces is designed to be interchangeable. The mechanical interfaces can each be designed as described above.

In addition, it is proposed that the consumer has a corresponding coding element or a further corresponding coding element which corresponds to the coding element of the battery pack. Advantageously, thereby a mechanical coding between the battery pack and the consumer can be realized.

Furthermore, the invention relates to a consumer, in particular a hand tool, with a housing, with a comprehensive at least one connecting element mechanical interface, via which the consumer is mechanically connected to a battery pack. It is proposed that the mechanical interface of the consumer is at least partially exchangeable. Advantageously, thereby the life of the consumer can be extended. drawings

Further advantages emerge from the following description of the drawing. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations. Reference numerals of features of different embodiments of the invention which substantially correspond to each other are given the same number and a letter characterizing the embodiment.

In the following exemplary embodiments, the mechanical interface according to the invention is assigned to a battery pack by way of example. Since the mechanical interface of the consumer essentially corresponds to the mechanical interface of the battery pack, it is obvious to a person skilled in the art to also apply the embodiments of the mechanical interface of the battery pack to a corresponding mechanical interface of the consumer.

Show it:

Fig. 1 is a side view of a system with a consumer and a battery pack;

FIG. 2 is a perspective view of a battery pack; FIG.

Fig. 3 is a perspective view of the battery pack of FIG. 2 without a

Interface housing;

FIG. 4 shows a side view of the battery packs according to FIG. 2; FIG.

5 shows a cross section through the system according to FIG. 1;

Fig. 6 is a cross-section through an alternative embodiment of the system with an alternative connector; a cross-section through another alternative embodiment of the system with an alternative connecting element; a perspective view of an alternative embodiment of the battery pack; a section through the battery pack according to Fig. 8a; a further section through the battery pack according to Fig. 8a; a perspective view of another alternative embodiment of the interface housing; a perspective view of a battery pack corresponding to the interface housing of FIG. 9a.

Description of the embodiments

FIG. 1 shows a side view of a system 10 made of a consumer 14 designed as a handheld power tool 12 and a battery pack 18 embodied as a handheld power tool battery pack 16. The hand tool 12 and the battery pack 18 each have a mechanical interface 20, 22, via which the two components of the system 10 are connected to each other. The hand tool 12 is exemplified as a hammer drill 24 is formed. The hand tool 12 has a housing 26, at the rear end of a handle 28 is arranged with an operating switch 30 for switching on and off of the power tool 12. At the front end of the housing 26 of the power tool 12, a tool holder 31 is arranged, which is provided for receiving an insert tool 32. Between the handle 28 and the tool holder 31 is an electric motor 34 and a transmission 36 having drive unit 38 is arranged. The transmission 36 includes a percussion unit 40 and is disposed above the electric motor 34. Below the electric motor 34, an electronics 42 is arranged, via which the hand tool 12 is regulated or controllable. The battery pack 18 is disposed below the handle 28 and adjacent to the electronics 42. The battery pack 18 and the consumer 14 each have a mutually corresponding electrical interface 44, 46, via which the battery pack 18 is electrically connected to the load 14, in particular the electronics 42 of the consumer 14 connectable. In the connected state, the battery pack 18 provides the power supply to the consumer 14. The battery pack 18 has a weight that corresponds to approximately Vi of the total weight of the system 10. Due to the weight and the arrangement of the battery pack 18, an increased load in the area of the mechanical interfaces 20, 22 results during operation of the system 10. In order to extend the service life of the system 10, in particular the mechanical interfaces 20, 22, the mechanical interfaces 20 , 22 formed at least partially interchangeable.

FIG. 2 shows the battery pack 18 with the mechanical interface 22 in a perspective view. The battery pack 18 is mechanically detachably connected to the load 14 via the mechanical interface 22. The Ak- Kupack 18 has a housing 48, which is designed as an example of several parts. The housing 48 consists of a plastic-containing housing material. Preferably, the housing 48 is formed of a polycarbonate or a high density polyethylene. The housing 48 is designed in particular as an outer housing. The housing 48 has on its underside a main body 50, on its upper side an interface housing 52 and on its side surfaces two opposite side walls 54. The housing parts 50, 52, 54 are connected to each other via fastening elements 56, which are exemplified as screws. The housing parts 50, 52, 54 are all at least partially designed as outer housing parts. On the front of the

Battery pack 18 is a charge status indicator 58 is arranged, via which the state of charge of the battery pack 18 can be displayed. The charge status indicator 58 is integrated in the housing 48, in particular in the main body 50. The housing 48, in particular the interface housing 52, comprises the mechanical interface 22 with a fixing element 60 and with the electrical interface 46. The battery pack 18 is designed, for example, as a sliding coupler. When attaching the battery pack 18 connecting elements 62 of the mechanical interface 22 of the battery pack 18, for example, comprise a guide groove, with corresponding connecting elements 64 (see FIG. 4) of the mechanical interface 20 of the consumer 14, which are exemplified as guide rails, engaged , The battery pack 18 is inserted by means of a relative movement in the insertion direction 66 in the power tool 12 and thereby guided by the connecting elements 62 of the battery pack 18 and the connecting elements 64 of the consumer. About the Verbindungsele- elements 62, 64 of the two mechanical interfaces 20, 22 of the battery pack

18 non-positively and positively releasably connected to the consumer 14. The relative movement for connecting the battery pack 18 has a degree of freedom of one. The connecting elements 62 of the mechanical interface 22 are exchangeable. The connecting elements 62 are detachably connected via fastening elements 90 (see FIG. 5) to the mechanical interface 22, in particular to the interface housing 52.

For locking the battery pack 18 with the consumer 14, the mechanical interface 22 on the fixing element 60. The fixing element 60 is designed as a spring-loaded latching element which is pivotally mounted in the housing 48 of the actuator. kupacks 18 is stored. The locking takes place via an insertion of the battery pack 18 along the insertion direction 66, wherein the fixing element 60 engages at the end of the relative movement in an undercut position. To release the lock, the mechanical interface 22 has a trained as a button actuator 68 which is movably coupled to the fixing member 60. By actuation of the actuating element 68, the fixing element 60 moves into the housing 48 of the battery pack 18, and the lock between the battery pack 18 and the load 14 is released so that the battery pack 18 is released with a movement opposite to the relative movement in the insertion direction 66 can be.

Furthermore, the system 10 has a mechanical coding 11, via which it can be ensured that only the combination of battery pack 18 and consumer 14 provided by the manufacturer is mechanically connectable to one another. The mechanical coding 11 comprises an akkupack side coding element 23 and at least one consumer-side coding element (not shown). The coding element 23 of the battery pack 18 is arranged on the outer surface of the housing 48. In particular, the coding element 23 is arranged in the region of the mechanical interface 22 and between the two connecting elements 62. The coding element 23 is integral with the molding as a molding

Interface housing 52 is formed. The coding element 23 is designed as an elongate web which extends transversely to the two connecting elements 62. In Fig. 3, the battery pack 18 without the interface housing 52 and without the

Side walls 54 are shown. The main body 50 of the housing 48 has a cell holder area. At least one rechargeable battery cell 70 is accommodated in the cell holder region, with the battery pack 18 in this embodiment having, for example, ten rechargeable battery cells 70 connected in parallel or in series. The battery cells 70 are arranged in two layers, with one layer each having five battery cells 70.

The battery cells 70 are cylindrical in shape and have electrical cell poles 72 at their end faces. The connection of the battery cells 70 with each other is realized via cell connector 74. The cell connectors 74 are designed for electrical connection of the battery cells 70 with each other in parallel and / or series connection. In the illustrated embodiment, two are each or four battery cells 70 connected via cell connectors 74. Furthermore, it can be seen that the individual battery cells 70 are received for mechanical fixation in the cell holder area of the main body 50 at a distance from each other. The cell holder area is used in addition to the fixing of the battery cells 70 in the housing 48 for cooling the battery cells 70 and is made of a thermally conductive material, such as aluminum or a good heat-conducting plastic. Furthermore, the cell holder region has sleeve-like insulating walls, so that the individual battery cells 70 are separated and electrical insulation of the individual battery cells 70 can be ensured from one another.

Above the cell holder region, in particular in the region between the base body 50 and the interface housing 52, an electronics 78 is arranged. The electronics 78 includes a circuit board 80. The electronics 78 is connected to the charge status indicator 58. On the circuit board 80 are electrical

Contact elements 82, which are provided for charging and discharging of the battery pack 18, and further contact elements 84, which are designed to transmit state information, such as the state of charge or the temperature of the battery pack 18, to the consumer 14, respectively. The electrical contact elements 82 and the other contact elements 84 are assigned to the electrical interface 46. The electrical contact elements 82, 84 are arranged in the assembled state of the battery pack 18 in recesses 83 (see FIG. 2) in the housing 48, in particular in the interface housing 52. The electrical contact elements 82 are connected to the electronics 78 and to the battery cells 70. The electrical connection of the electrical contact elements 82 with the battery cells 70 via formed as solder joints contact point 86 at which the battery cells 70 are soldered via the cell connectors 74 formed as wires with electrical conductors 88. Alternatively, a welded joint of the cell connector 74 with the electrical conductor 88 is conceivable.

4, the battery pack 18 is shown in a side view. The side wall 54 is connected via fastening elements 56 to the interface housing 52 and the main body 50 of the housing 48. The connecting elements 62 can be removed via fastening elements 90, in particular releasably supported by tools, with the mechanical interface 22, in particular with the interface device. housing 52, connected. Each connector 62 is connected to two fasteners 90 in this embodiment. However, it is also conceivable that the connecting elements 62 are connected to more or less than two fastening elements 90. The fasteners 90 are exemplified as screws. The screws 90 may be formed of a metallic material or of a plastic. An end face of the fastening element 90, in this embodiment the screw head, is arranged in the region in which the corresponding connecting element 64 of the consumer 14 is guided or engages in the connecting element 62 of the battery pack 18 which includes a guide groove. The fastening elements 90 are preferably arranged sunk in the connecting element 62. Alternatively, it is also conceivable that the fastening element 90, in particular the end face of the fastening elements 90, partially form the guide surface of the connecting element 62. An end face of one of the fastening elements 90 is covered with a sealing element 91. The sealing member 91 is formed as a plastic seal and must be removed prior to loosening the fastener 90, wherein removal of the sealing member 91 results in irreparable damage to the sealing member 91.

FIG. 5 shows a cross section through the mechanical interface 20 of the load 14 and the mechanical interface 22 of the battery pack 18 of the system 10 according to FIG. 1. The consumer 14 has an electrical interface 44, which comprises a plurality of electrical contacts 92 and via which the electrical interface 44 of the consumer 14 with the electrical interface 46 of the battery pack 18 is electrically connected. The electrical contacts 92 are disposed on a contact holder 94 which is fixed in the handle 28 of the consumer 14, in particular in the foot of the handle 28 of the consumer 14. In this embodiment, the connecting element 64 formed as a guide rail of the consumer 14 engages in the corresponding connecting element 62 of the battery pack 18 which comprises a guide groove. The connecting elements 62, 64 are essentially L-shaped. The connecting element 64 bears against two outer surfaces of the connecting element 62 of the battery pack 18. During normal operation of the power tool 12, the orientation of the system 10 substantially corresponds to that shown in FIG. Orientation, wherein the battery pack 18 is disposed at the lower end of the power tool 12. In this orientation, a force acts on the bearing surface 96 of the connecting element 62, starting from the weight of the battery pack 18.

FIG. 6 shows an alternative embodiment of the mechanical interface 22a in a cross section. In contrast to the previous embodiment, the mechanical interface 22a has no mechanical coding 11, which is arranged between the connecting elements 62, but an alternative mechanical coding IIa with coding elements 23a, which are formed integrally with the exchangeable connecting elements 62a. The mechanical coding IIa is provided for coding the battery pack 18a with the consumer 14a. The mechanical coding IIa is provided by the area in which the connecting element 62a forms a guide groove being bounded laterally and in height by two respective opposing walls 98a, 100a. The connecting element 62a is substantially U-shaped. This limitation results in comparison to the connecting element 62 from the previous embodiment, a flatter and narrower groove portion of the connecting member 62 a, which has the consequence that the consumer 14 is not connected to the battery pack 18 a, in particular thus the connecting element 64 is not connected to the connecting element 62a is connectable. The connecting element 64a of the consumer 14a is designed as the coding element 102a corresponding to the coding element 23a.

FIG. 7 shows a further alternative embodiment of the mechanical interface 22b in a cross section. The exchangeable connecting elements 62b are L-shaped and each have a coding element 23b designed as a molding. The mechanical coding IIb is provided in particular for coding the connection between the connecting element 62b and the battery pack 18b, in particular for coding the connection between the connecting element 62b and the interface housing 52b. The mechanical interface 22b, in particular the interface housing 52b, has a coding element 102b which corresponds to the coding element 23b and which is designed, for example, as a groove. In Fig. 8a an alternative embodiment of the battery pack 18 is shown. The structure of the battery pack 18d largely corresponds to the structure of the battery pack 18, and the differences are described in more detail below. The housing 48c of the battery pack 18c is formed in two parts with a main body 50c and an interface housing 52c. The main body 50c is releasably connected to the interface housing 52c, in particular with tool support, via external fastening elements 104c. The interface housing 52c is advantageously designed exchangeable. In particular, the interface housing 52c is designed to be exchangeable such that both the connection elements 62c and the contact elements 82c, 84c are exchangeable with the interface housing 52c. Advantageously, all components susceptible to wear can thereby be replaced simultaneously. The interface housing 52c includes the mechanical interface 22c and partially the electrical interface 46c of the battery pack 18c. The replaceable interface housing 52c comprises two connecting elements 62c, each comprising a guide groove, which are formed integrally with the interface housing 52c. Furthermore, the interface housing 52c comprises five contact elements 82c, 84c designed as spring contacts, which are fixedly or non-detachably connected to the interface housing 52c.

FIG. 8b shows a section through the plane A drawn in FIG. 8a. The contact elements 82c, 84c are connected to a housing cover 106c of the interface housing 52c. The housing cover 106c in particular forms the top side of the housing 48c of the battery pack 18c. The connection of the contact elements 82c, 84c with the interface housing 52c is effected in particular by a positive reception of the contact elements 82c, 84c through the interface housing 52c. However, other types of attachment are conceivable, such as, for example, a material fit by gluing the contact elements 82c, 84c to the interface housing 52c. The contact elements 82c, 84c are electrically connectable to the main body 50c or to the electronics 78c of the battery pack 18c via inner fastening elements 108c.

FIG. 8c shows a section through the plane B drawn in FIG. 8a. The inner fastener 108c is exemplified as a screw. forms, which electrically connects the electrical contact element 84c with a cable lug 110c. The contact elements 82c, 84c each have a receptacle or bore for the inner fastening elements 108c. In the main body 50c of the housing 48c of the battery pack 18c, a nut 112c is recessed. The cable lug 110c is arranged between the nut 112c and the electrical contact element 84, so that the electric contact element 84c acts on the cable lug llOd by tightening the inner fastening element 108c designed as a screw. The interface housing 52c, in particular the housing cover 106c of the

Interface housing 52c, has an opening 114c which is disposed in the region of the inner fastening elements 108c. The opening 114c is arranged in particular above the inner fastening elements 108c. The opening 114c is preferably arranged such that the inner fastening element 108c can be inserted and / or fastened via the opening 114c.

In order to protect the interface housing 52c from entry of dust and moisture after attachment of the inner fastener 108c, the interface housing 52c has a sealing member 116c. The sealing member 116c is formed of an elastic plastic and is inserted into the opening 114c. The sealing element 116c is preferably connected to the interface housing 52c in a material-locking or non-positive and positive-locking manner.

FIGS. 9a and 9b show an alternative embodiment of the battery pack 18d with a replaceable interface housing 52d. The housing 48d of the battery pack 18d is constructed in two parts, wherein the interface housing

52d is connected via outer fastening elements 104d to the main body 50d of the housing 48d. Interchangeable interface housing 52d includes mechanical interface 22d and partially electrical interface 46d. The exchangeable interface housing 52d comprises, in particular, two opposite connecting elements 62d, which each have a guide groove and which are formed integrally with the interface housing 52d. Furthermore, the interface housing 52d comprises five contact elements 82d, 84d, which are fixedly or non-detachably connected to the interface housing 52d. The main body 50d has, per outer fastening element 104d, a fastening element receptacle 118d designed as a screw dome. to electrical connection of the contact elements 82d, 84d of the interface housing 52d with the battery cells of the battery pack 18d are arranged on the electronics 78d, in particular on the circuit board 80d, busbars 120d. The busbars 120d may be formed as high voltage busbars. In particular, the bus bars 120d, which are connected to the electrical contact elements 82d for charging and discharging, are formed as high-voltage bus bars. Preferably, the contact elements 82d, 84d planar contact surfaces (not shown), which rest in the assembled state of the busbar 120d and make electrical contact. In order to improve the electrical connection in the region of the busbars 120d, it is additionally conceivable that the contact elements 82d, 84d are connected to the printed circuit board 80d by way of internal fastening elements, for example.

Claims

claims

1. battery pack, in particular Handzeugmaschinenakkupack, with a housing (48) in which at least one battery cell (70) is arranged with a at least one connecting element (62) comprehensive mechanical interface (22) through which the battery pack (18) with a consumer (14) is mechanically connectable, characterized in that the mechanical interface (22) is formed at least partially replaceable.

2. Battery pack according to claim 1, characterized in that the mechanical interface (22) has a support surface (98), and a ratio between the support surface (98) and a weight of the battery pack (18) is smaller than 5 cm ² / kg.

3. Battery pack according to one of the preceding claims, characterized in that the connecting element (62) non-positively and / or positively connected to the housing (48) is detachably connected.

4. Battery pack according to one of the preceding claims, characterized in that the connecting element (62) is designed such that the battery pack (18) for producing a non-positive and / or positive connection with the consumer (14) by the connecting element (62). are feasible.

5. Battery pack according to one of the preceding claims, characterized in that the connecting element (62) is designed as a guide rail.

6. Battery pack according to one of the preceding claims, characterized in that the battery pack (18) has at least two connecting elements (62).

7. Battery pack according to one of the preceding claims, characterized in that the connecting element (62) via at least one fastening element (90) on the housing (48) can be fastened.

8. Battery pack according to one of the preceding claims, characterized in that the connecting element (62) via a sealing element (91) is sealed.

9. Battery pack according to one of the preceding claims, characterized in that the connecting element (62) is made of a material differing from the housing (48).

10. Battery pack according to one of the preceding claims, characterized in that the connecting element (62) is made of a ceramic, a plastic or a metal.

11. Battery pack according to one of the preceding claims, characterized in that the connecting element (62a) has a coding element (23a) for mechanical coding.

12. Battery pack according to claim 11, characterized in that the housing (48b) of the battery pack (18b) has a corresponding coding element (102b).

13. System comprising a battery pack (18) with a mechanical interface (22) and a consumer (14) with a mechanical interface (20), characterized in that at least one of the mechanical interfaces (20, 22) is designed exchangeable.

14. System according to claim 13, characterized in that the consumer

(14a) has a corresponding coding element (102a) or a further corresponding coding element.

15. consumer, in particular hand tool, with a housing (26),

with a mechanical interface (20) comprising at least one connecting element (64), via which the load (14) can be mechanically connected to a battery pack (18), characterized in that the mechanical interface (20) is at least partially replaceable.