Battery pack

Abstract

To provide a storage battery pack capable of extending the service life of the storage battery pack.SOLUTION: There is provided a storage battery pack including a housing and a mechanical interface 22 for removably coupling the storage battery pack 18 with a power consumer 14, especially in the storage battery pack for a manual machine tool, and the mechanical interface 22 has at least one pre-determined break point designed such that a break occurs in the area of the pre-determined break point in the event of an overload of the mechanical interface.SELECTED DRAWING: Figure 1

Description

[Background technology]

[0001] Patent Document 1 describes a battery pack for a manual machine tool, which includes a battery pack housing, at least one cell holder, and battery pack electronics with a flexible wiring board, where the cell holder holds at least one battery cell. [Prior art documents] [Patent documents]

[0002] [Patent Document 1] German Patent Application Publication No. 102016203427 Summary of the Invention

[0003] The present invention relates to a battery pack, in particular a battery pack for manual machine tools, having a housing with a cell housing in which at least one accumulator cell is received through an axial opening, the cell housing having at least one radial opening through which the at least one accumulator cell can be accessed. It is proposed that a sealing element be arranged in the region of the at least one radial opening, sealing the radial opening. This has the advantage of extending the service life of the battery pack.

[0004] The battery pack is particularly part of a system consisting of the battery pack and a power consumer, and the power consumer receives energy through the battery pack during operation. The battery pack is particularly configured as a replacement battery pack. The battery pack is particularly configured to be connectable to a charging device for charging the battery pack. The battery pack housing is particularly configured as an outer housing. The battery pack, in particular the battery pack housing, is detachably connectable to the power consumer and / or the charging device via a mechanical interface. The battery pack housing can have one or more housing parts, and the cell housing is one of these housing parts. The housing parts are connected to each other by frictional, form, and / or material joints. The mechanical interface of the battery pack is particularly intended for a system consisting of the battery pack and a power consumer, in which the weight proportion of the battery pack is at least 1 / 8 of the total weight, in particular at least 1 / 4 of the total weight, preferably at least 1 / 3 of the total weight. Such a weight ratio, due to the large weight of the battery pack and the mass inertia of the battery pack, can result in very high loads on the mechanical connections if the system is dropped, which can lead to irreversible damage to the mechanical interfaces.

[0005] The power consumer may be configured, in particular, as a garden tool, such as a lawn mower or pruning shears; a household tool, such as an electric window washer or hand cleaner; a manual machine tool, such as an angular grinder, a screwdriver, a drill, or a drill hammer; or a measuring tool, such as a laser distance measuring device. It is also conceivable for the power consumer to be configured as other, particularly portable, tools, such as a construction site light, a dust collector, or a construction site radio. The battery pack can be coupled to the power consumer via a mechanical interface in a frictional and / or positive manner. The mechanical interface preferably includes at least one operating element, via which the connection between the power consumer and / or the charging device and the battery pack can be released. The operating element can be configured, for example, as a button, lever, or key. Furthermore, the battery pack has at least one electrical interface, via which the power consumer and / or the charging device and the battery pack can be electrically connected. The battery pack can be charged and / or discharged via this electrical connection. Alternatively or additionally, it is also conceivable that information can be transmitted via an electrical interface. The electrical interface is preferably configured as a contact interface in which an electrical connection is made through physical contact between at least two conductive components. The electrical interface preferably includes at least two electrical contacts. In particular, one of the electrical contacts is configured as a positive contact and the other as a negative contact. Alternatively or additionally, the electrical interface can include a secondary charging coil member for inductive charging. The battery pack housing further includes at least one accumulator cell that can be electrically connected to a power consumer via an electrical contact device. The accumulator cell may be configured as a galvanic cell having a structure in which one cell pole is located at one end and another cell pole is located at the opposite end. In particular, the accumulator cell has a positive cell pole at one end and a negative cell pole at the opposite end.The accumulator cells are preferably NiCd or NiMh cells, with lithium-based or Li-ion accumulator cells being particularly preferred. The accumulator voltage of the accumulator pack is typically a multiple of the voltage of a single accumulator cell and is determined by the wiring (parallel or series) of the individual accumulator cells. Thus, for example, a accumulator cell having a commonly used voltage of 3.6 V can provide accumulator voltages of 3.6 V, 7.2 V, 10.8 V, 14.4 V, 18 V, 36 V, 54 V, 108 V, etc. The accumulator cells are preferably configured as round cells that are at least substantially cylindrical, with cell poles located at each end of the cylindrical shape. Additionally, the electrical interface can have at least one additional contact configured to transmit additional information to the power consumer and / or the charging device. The accumulator pack preferably includes electronics, which can include a memory unit in which information is stored. Additionally or alternatively, it is also conceivable for the information to be determined by the electronics. Such information may be, for example, the state of charge of the battery pack, the temperature inside the battery pack, the coding or remaining capacity of the battery pack. Furthermore, it is conceivable that electronics are configured to regulate or control the charging and / or discharging process of the battery pack. The electronics may, for example, comprise a circuit board, a computing unit, a control unit, transistors, capacitors, and / or a storage unit. Furthermore, the electronics may comprise one or more sensor elements, such as, for example, a temperature sensor for determining the temperature inside the battery pack. Alternatively or additionally, the electronics may comprise a coding element, such as, for example, a coding resistor.

[0006] The cell housing is preferably configured at least partially as an outer housing part. The cell housing has at least one storage area for at least one accumulator cell. The cell housing particularly has a plurality of storage areas, each of which accommodates one or more accumulator cells. All accumulator cells of the accumulator pack are preferably accommodated individually in the storage areas of the cell housing. The cell housing is preferably configured as a single unit. The cell housing is preferably made of plastic, for example HDPE (high density polyethylene). In particular, the cell housing has at least one axial opening for each storage area. "Axial opening" in this context particularly means an opening in the cell housing that is cut from the longitudinal axis of at least one accumulator cell arranged in the storage area. In particular, the axial opening extends substantially perpendicular to the longitudinal axis of at least one accumulator cell arranged in the storage area. The axial opening is particularly configured as an accommodation opening, through which the accumulator cell can be inserted or accommodated in the cell housing. The cell housing preferably has one axial opening for each accumulator cell that can be accommodated therein. The axial openings are preferably arranged on the same side of the cell housing. It is also conceivable for the axial openings of the cell housing to be arranged on different sides, preferably on sides facing each other. The radial openings are preferably arranged on sides different from the side on which the axial openings are arranged. The radial openings preferably extend substantially parallel to the longitudinal axes of the accumulator cells arranged in the storage area in at least one direction. The storage area may have no axial openings, or may have one or more axial openings. The radial openings are preferably configured as individual cell monitoring openings. Here, the term "individual cell monitoring openings" is intended to mean, in particular, openings through which electrical contacts can be brought into electrical contact with individual accumulator cells of the accumulator cell complex, e.g., to determine the voltage of the individual accumulator cells. Alternatively or additionally, the radial openings are preferably configured as temperature monitoring openings, through which the temperature of the accumulator cells can be determined by a temperature sensor.The storage areas are delimited, in particular, by walls of the cell housing. In particular, the cell housing has one wall per storage area, which are integrally formed with one another. The walls are interrupted by axial and radial openings. The shape of the walls is preferably at least partially adapted to the shape of the accumulator cells to be arranged in the storage areas. The walls in particular have an inner side against which the accumulator cells abut at least partially, in particular over the entire surface. The inner side of the wall is preferably cylindrical. In the region of the radial openings, the accumulator cells arranged in the storage areas preferably have an electrically conductive, preferably metallic, outer jacket. The sealing elements are particularly designed to protect the radial openings against the intrusion of conductive or abrasive particles or dust. The sealing elements are preferably made of an elastic or flexible plastic material. In particular, the battery pack has at least one sealing element per radial opening, which are preferably integrally formed with one another. The at least one sealing element is preferably arranged outside the storage areas, preferably completely outside the storage areas.

[0007] It is further proposed that the battery pack has a seal support made of at least two components, at least one component made of hard plastic and at least one component made of soft plastic, with the seal being configured as the soft plastic component. This advantageously improves assembly of the battery pack. The seal support is preferably manufactured using a two-component injection molding process. In particular, the seal support is connected to the housing by frictional and / or form-fitting or material-fitting. The connection between the seal support and the housing is preferably made via the hard plastic component. The seal support is preferably configured as a separate component. In particular, the seal support has at least two hard plastic components movably connected to one another via the soft plastic component. In particular, the hard plastic components have higher rigidity and / or hardness than the soft plastic components. The soft plastic components can be bent and / or deformed with less force than the hard plastic components. The soft plastic components are preferably made of elastic plastic or rubber.

[0008] It is further proposed that the accumulator cell be at least partially surrounded by a double wall on the side where the radial opening is located by the cell housing and another outer housing part. This advantageously allows for further improved protection of the radial opening. In particular, the outer housing part is connected to the cell housing in a friction-fit and / or form-fit manner. It is preferred that a straight line extending perpendicular to the longitudinal axis of the accumulator cell arranged in the receiving area, starting from the longitudinal axis, first intersects with the radial opening and then with the outer housing part.

[0009] Furthermore, it is proposed that the seal member support is arranged between the cell housing and the further outer housing part, in particular that it is connected to the cell housing and / or the further outer housing part in a friction-fit and / or form-fit manner, which has the advantage of simplifying assembly.

[0010] It is further proposed that the seal member support has at least one positioning means, which has the advantage of further simplifying assembly. The positioning means is preferably configured as a guide element, by which the seal member support is guided during connection with the housing. The housing of the battery pack, in particular the cell housing and / or another outer housing part, has at least one corresponding positioning means configured for form-fit connection with the positioning means of the seal member support. The form-fit between the respective positioning means is particularly effective in at least two opposite directions. The positioning means is preferably configured integrally with the seal member support or the housing.

[0011] It is further proposed that the cell housing be arranged between at least one accumulator cell and the electronics, and that the electronics be connected to the accumulator cell through at least one radial opening. This has the advantage that the electronics can be connected to at least one accumulator cell, for example for individual cell monitoring, thereby improving the control of the accumulator pack. In particular, the cell housing is arranged only partially, not completely, between the accumulator cell and the electronics. Preferably, a wall of the cell housing's receiving area is arranged between the accumulator cell and the electronics. In particular, the electronics is connected to at least one accumulator cell through at least one radial opening by at least one contact element. This contact element is particularly configured as an electrical contact element and is electrically connected to the accumulator cell. In particular, the contact element abuts against an outer surface of the accumulator cell.

[0012] Furthermore, it is proposed that the electronic device has a first wiring board and a second wiring board, and a seal member support is disposed between the wiring boards. In particular, the first wiring board is configured as a flexible wiring board. Preferably, the second wiring board is configured as a non-flexible wiring board.

[0013] Preferably, the at least one contact member is connected to or integrally formed with the first wiring board, and the flexible wiring board is at least partially formed, for example, of laminated copper tape, the copper tape forming the contact member.

[0014] It is further proposed that the first circuit board and the second circuit board are connected to each other via a plug connection. In particular, the first circuit board has a plug and the second circuit board has a bushing, or vice versa. Alternatively, it is also conceivable that the first and second circuit boards each have a bushing, which can be connected via separate plugs, for example configured as cables. The flexible circuit board is preferably substantially completely covered by the seal support, which has the advantage of increased mechanical stability.

[0015] It is further proposed that the electronics, in particular the first and / or second circuit board, have a display unit that is covered outwardly by the rigid plastic component of the seal member support. In particular, the rigid plastic component is configured transparently. The display unit is configured, in particular, for displaying information. The display unit preferably has at least one display or light-emitting component configured, for example, as an LED. The display unit may be configured, for example, as a charge status indicator that can display the charge status of the accumulator pack. A "transparent" rigid plastic component is intended, in particular, to mean a light-transmitting rigid plastic component. The rigid plastic component is preferably configured transparently so that the color of light remains substantially unchanged when passing through the rigid plastic component.

[0016] Furthermore, it is proposed that the electronics, in particular the first and / or second circuit board, have an operating element that is covered outwardly by the soft plastic component of the seal support. This has the advantage that the battery pack can be effectively protected from dust in the area of ​​the operating element. The operating element is configured, in particular, for manual control of the electronics, preferably for control of the charge state indicator. The operating element is preferably arranged on the first circuit board. The operating element may be configured, for example, as a button, switch, or key.

[0017] The present invention further relates to a battery pack, particularly a battery pack for a manual machine tool, having a housing in which at least one battery cell is arranged and an electrical interface configured for connecting the battery pack to a power consumer, the electrical interface being connected to the at least one battery cell via an electrical contact device. It is proposed that the electrical contact device has a tubular conductor. The use of a tubular conductor has the advantage that particularly good heat dissipation or heat distribution is realized in the battery pack. The tubular conductor is particularly configured as a metal tube. The tubular conductor can have a substantially circular or substantially rectangular cross section. The tubular conductor is preferably made of a copper alloy, copper, or oxygen-free copper. The tubular conductor is preferably configured as a single component, particularly made from a single material.

[0018] It is further proposed that the electrical interface has at least two power contacts configured for connection with two corresponding power contacts of the power consumer, at least one of which is connected to the accumulator cell via an electrical contacting device. Via the power contacts, energy is provided from the accumulator pack during operation of the power consumer, or a current flows to the power consumer for energy supply. The power contacts of the accumulator pack and the power contacts of the power consumer are preferably configured to be connectable to each other via a plug connection.

[0019] It is further proposed that the tubular conductor has a first end at which the tubular conductor is connected to a fuse element. The fuse element has the advantage of protecting the electronics of the battery pack, for example, in the event of a short circuit. The fuse element is particularly configured as an electrical fuse element. The fuse element is particularly configured so that, upon activation, for example, in the event of a short circuit, the fuse element is destroyed and thus requires replacement. The fuse element may be configured, for example, as a melting fuse. The fuse element preferably has a cylindrical shape. The fuse element preferably includes a ceramic sleeve in which a wire fuse is disposed.

[0020] It is further proposed that the diameter of the tubular conductor at the first end be adapted to the fuse element, in particular be enlarged to accommodate the fuse element in the enlarged region. This has the advantage that the tubular conductor can be easily and reliably connected to the fuse element. The connection between the fuse element and the tubular conductor is preferably achieved by a friction-fit and / or form-fit connection, preferably by a press fit of the first end of the tubular conductor onto the fuse element. In particular, the inner diameter of the first end of the tubular conductor substantially corresponds to the outer diameter of the fuse element before or after assembly.

[0021] It is further proposed that the tubular conductor has a second end, at which the tubular conductor is connected, preferably in a materially bonded manner, to the storage cell, in particular via a cell connector. The materially bonded connection can be achieved, for example, by welding or soldering. In particular, a resistance welding method using hard solder is considered. Cell connector in this context is intended to mean in particular a metallic component that is connected, preferably in a materially bonded manner, to one of the cell poles of at least one storage cell, preferably to each of the cell poles of at least two storage cells.

[0022] It is further proposed that the tubular conductor be bent and / or flattened at its second end, which advantageously improves or simplifies the assembly or connection of the tubular conductor to the accumulator cell. In particular, the tubular conductor is bent at its second end so that the distance between the tubular conductor's second end and the accumulator cell or cell connector is reduced. The tubular conductor is preferably bent at its second end toward the accumulator cell and / or toward the nearest side of the cell housing having an axial opening. In this context, the term "flattened" end particularly means that the shape of the tubular conductor changes at the second end so that the height of the tubular conductor at the second end is smaller than the diameter of the tubular conductor at the first end. In particular, the tubular conductor is flattened at its second end so that two opposing tubular walls abut against each other. This advantageously simplifies the material-bonding connection of the tubular conductor to the accumulator cell or cell connector. In particular, the tubular conductor encloses a hollow space at the first end that is larger than the hollow space at the second end.

[0023] Furthermore, the tubular conductor must be at least 8 mm 2 , especially at least 10 mm 2 , preferably at least 15 mm 2 It is proposed that the tubular conductor have a minimum cross-sectional area of ​​1000 kJ / cm. This has the advantage of ensuring that a sufficient current can be provided for the energy supply to the power consumer. In particular, the cross-sectional area of ​​the tubular conductor is substantially constant over its length.

[0024] Furthermore, it is proposed that a heat storage element is arranged inside the tubular conductor, which has the advantage that heat generation inside the battery pack can be better controlled. The heat storage element is arranged in particular in the hollow space of the tubular conductor. It is preferred that the heat storage element fills the hollow space of the tubular conductor at least partially, preferably completely. The heat storage element can consist of a solid and / or a liquid. In particular, the heat storage element has a capacity of at least 1.1 J(g * K), especially at least 1.5 J / (g * K), preferably at least 2.0 J / (g *It has a high heat capacity (K). It is also conceivable that the heat storage element consists of a material that changes its state of cohesion during operation in order to absorb as much heat as possible. The heat storage element may consist of a plastic, for example HDPE.

[0025] Furthermore, the present invention relates to a method for manufacturing an electrical contact device, comprising the steps of: - Metal pipes, in particular copper pipes, are manufactured, -The metal tube is cut, - a metal tube is crimped onto the fuse element; -The metal tube is flattened, The flattened area of ​​the metal tube is welded to the conductor member or cell connector.

[0026] The present invention further relates to a battery pack, in particular a battery pack for a manual machine tool, having a housing in which at least one battery cell is accommodated. It is proposed that the battery pack has at least one protective element connected to the housing. This has the advantage that the battery pack, and in particular the battery cells arranged therein, can be effectively protected in the event of a fall. The protective element is particularly designed for locally reinforcing the housing of the battery pack, in particular the cell housings of the battery pack.

[0027] It is further proposed that the protective element be frictionally and / or form-fittingly connected to the housing. Alternatively, it is conceivable that the protective element be physically connected to the housing, for example by adhesive bonding. In particular, the protective element has a higher hardness and / or strength than the housing or housing part to which it is connected. This has the advantage that an effective reinforcement of the housing can be achieved. The protective element can be made of plastic and / or metal. In particular, the protective element is electrically insulated via the housing from current-carrying components of the battery pack, such as electrical contacts. The protective element is preferably made of a thin plate. The thin plate can be flat or curved. In particular, the protective element has a higher rigidity than the surrounding housing, in particular at least 10 times higher rigidity than the surrounding housing. "Hardness" here refers to the mechanical resistance of a material or component, in particular against mechanical penetration by other objects. "Rigidity" refers in particular to the resistance of a material to deformation or splitting.

[0028] Furthermore, it is proposed that the accumulator cells have cell jackets, in particular made of metal, and that the protective element has a wall thickness greater than that of the cell jackets of the accumulator cells, which has the advantage that the accumulator cells can be effectively protected from deformation in the event of a fall.

[0029] It is further proposed that at least one accumulator cell is arranged in a cell housing, and that the protective element is arranged inside and / or outside the cell housing. In particular, the cell housing has at least one storage area for the at least one accumulator cell, the storage area being delimited by a wall, the accumulator cell abutting on the inside of the wall, and the protective element abutting on the outside of the wall. Alternatively, it is also conceivable that the protective element abuts on the inside of the wall. Preferably, the curvature of the wall and / or the protective element is configured substantially circular.

[0030] It is further proposed that the walls, in particular the walls and the protective elements, are at least partially adapted to the outer contour of the accumulator cells, which has the advantage that a more compact structure of the accumulator pack can be realized. In particular, the walls and / or the protective elements have a curvature that is adapted to the outer contour of the accumulator cells or the cell jackets of the accumulator cells. In particular, the walls, in particular the walls and the protective elements, are at least partially curved, preferably circular, when viewed in cross section.

[0031] It is further proposed that the protective elements are arranged in an angular region between 60° and 180° around the periphery of the accumulator cell. In particular, a single protective element is arranged in an angular region between 60° and 180° around the periphery of a single accumulator cell, the angular region then extending in the circumferential direction of the accumulator cell. Alternatively, the angular region may be between 80° and 120° or between 130° and 160°.

[0032] Furthermore, it is proposed that the protection element is made of a metallic material, in particular steel, titanium or aluminium, which has the advantage that it embodies sufficient strength and / or hardness to effectively protect the battery pack.

[0033] It is further proposed that the protective element is arranged at least partially, in particular completely, inside the housing. In particular, the protective element is arranged in a receiving pocket of the cell housing, in particular attached to the cell housing in a frictional manner in the receiving pocket of the cell housing. The receiving pocket for the protective element is preferably arranged outside the receiving area for the accumulator cells.

[0034] It is further proposed that the cell housing has at least two opposing storage pockets, which are preferably arranged such that the protective elements arranged in these storage pockets protect the same accumulator cell, which has the advantage of further improving the protection of the accumulator cell.

[0035] It is further proposed that at least one accumulator cell, preferably at least two accumulator cells, are protected by at least one protective element along at least 50%, in particular along at least 75%, preferably along at least 90% of the length of the accumulator cell, in particular the protective element being arranged in an edge region of the accumulator pack which preferably extends parallel to the longitudinal direction of the at least one accumulator cell.

[0036] It is further proposed that the protective element be arranged at a distance from the mechanical interface of the battery pack, in particular on the side of the battery pack facing the mechanical interface, which has the advantage that the battery pack can be protected in the area where the greatest force acts on the battery pack in the event of a fall. In particular, the distance between the mechanical interface of the battery pack and the protective element is at least the diameter or width of the battery cell, in particular at least twice the diameter or twice the width of the battery cell, and preferably the length of the battery cell.

[0037] It is further proposed that the protection element is connected to the energy absorbing element, and that the energy absorbing element is configured so that the energy absorbing element penetrates at least partially into the housing, in particular into the cell housing, under the action of force. In particular, the protection element and the energy absorbing element are configured as one piece. This has the advantage that the protection of the accumulator cells can be further improved by the energy absorbing element. The energy absorbing element is configured in particular to absorb energy acting against it by causing a deformation of the housing, in particular a deformation of the cell housing. The energy absorbing element is preferably configured as a tooth. The tooth is preferably arranged in particular on an edge of the protection element. The tooth has at least one tooth-like element, and the tooth-like element preferably has at least one sharp edge.

[0038] The present invention further relates to a system consisting of a battery pack and a manual machine tool, the housing of which partially forms the outer surface of the system when the system is connected. It is proposed that a protective element be arranged between the area of ​​the battery pack that forms the outer surface of the system and at least one battery cell. This has the advantage that the battery cells arranged in the battery pack can be effectively protected in the event of a fall of the system.

[0039] The present invention further relates to a battery pack, in particular a battery pack for manual machine tools, having a housing and a mechanical interface for removably connecting the battery pack to a power consumer. It is proposed that the mechanical interface has at least one predetermined breaking point designed to break in the area of ​​the predetermined breaking point in the event of an overload of the mechanical interface. This has the advantage that damage to the battery pack caused by an overload can be controlled. Overload of the mechanical interface can occur, for example, when a strong, impact-like force is applied, such as when the battery pack is dropped or when the system consisting of the battery pack and the power consumer is dropped. It is equally conceivable that an overload occurs after a prior weakening of the mechanical interface, for example due to wear.

[0040] It is further proposed that the mechanical interface has at least one holding element against which the weight of the battery pack acts at least partially, in particular completely, during operation, and that the predetermined breaking point is located in the area of ​​the holding element. In particular, the holding element is configured as a guide element, preferably as a guide rail. This has the advantage that a particularly effective predetermined breaking point can be realized.

[0041] It is further proposed that the housing of the battery pack has an outer surface and an inner surface, and that the predetermined rupture point is configured so that the inner surface remains substantially unchanged in the event of damage, thereby ensuring that the electronics contained in the battery pack and the contained battery cells are protected.

[0042] Furthermore, it is proposed that the predetermined breaking point be designed so that, in the event of damage or activation of the predetermined breaking point, at least one holding element, in particular at least one guide rail, breaks off, so that the accumulator pack can no longer be connected to the power consumer. This has the advantage that the damaged accumulator pack can be prevented from being used, in particular because the mechanical interface no longer functions properly after activation of the predetermined breaking point.

[0043] It is further proposed that the predetermined breaking point have a length corresponding to at least 25% of the length of the holding element, in particular at least 50% of the length of the holding element, and preferably at least 75% of the length of the holding element. This has the advantage that the mechanical interface can be torn by the predetermined breaking point and can be automatically further torn by overload. Alternatively, it is also conceivable that the length of the predetermined breaking point substantially corresponds to the length of the holding element.

[0044] It is further proposed that the predetermined breaking point extends in a straight line, in particular parallel to the connecting direction of the battery pack, which in particular means the direction in which the battery pack is inserted into or fitted onto the power consumer.

[0045] It is further proposed that the housing have a break point configured as a hollow space and / or made of a material different from the housing, in particular plastic or metal. This has the advantage that the break point can be used to precisely introduce weakness into the housing, in particular at the mechanical interfaces. The material of the break point is preferably configured so as to have low adhesion to the material of the housing, in particular to the material of the mechanical interfaces of the housing. In particular, the break point is configured as an elbow, in particular a metal elbow. Alternatively, the break point can be configured in the form of a plate or a rod.

[0046] It is further proposed that the break point element is arranged at least partially, in particular completely, inside the retaining element, in particular inside the guide rail. The break point element is preferably surrounded by the retaining element on at least two sides, preferably on at least two opposite sides, particularly preferably on at least three sides. Alternatively, it is also conceivable that the break point element is surrounded by the retaining element completely, or completely except for one side. In particular, the break point element is configured to be integrated into a housing. In particular, the housing is connected to the break point element in a friction- and / or form-locking manner. The housing together with the break point element is preferably produced by a multi-component injection molding process.

[0047] It is further proposed that the breakage point be arranged at a minimum distance from the upper or lower side of the guide rail in the region between the breakage point element and the outer surface of the battery pack.

[0048] It is further proposed that the battery pack has a wear protection element. In particular, the breakage point element and the wear protection element are constructed as one piece. This has the advantage that the breakage point element can fulfill two different functions. Alternatively, it is also conceivable that the wear protection element is constructed as a separate component from the breakage point element. In particular, the wear protection element and the holding element or the guide rail are produced by a two-component injection molding process or are connected to each other. The wear protection element in particular forms the sliding surface of the guide rail of the battery pack, along which the housing of the manual tool or the corresponding guide rail of the manual tool slides during the connection process with the manual tool. The wear protection element preferably has a higher hardness and / or rigidity than the holding element or the housing of the battery pack. The wear protection element is preferably made of metal, in particular steel.

[0049] Further advantages will become apparent from the following description of the drawings. The drawings, the detailed description and the claims contain numerous elements in the form of combinations. Those skilled in the art will focus on these elements individually and group them into other meaningful combinations for their own purposes. Elements of different embodiments of the present invention that substantially correspond to each other are designated by the same numeral and a letter characterizing these embodiments. [Brief explanation of the drawings]

[0050] [Figure 1] 1 is a side view showing a system including a manual machine tool and a battery pack according to the present invention. [Figure 2] FIG. 2 is a perspective view showing the battery pack. [Figure 3] FIG. 2 is an exploded view showing the battery pack. [Figure 4] FIG. 2 is a perspective view showing a cell housing that houses a storage battery cell. [Figure 5] FIG. 5 is a perspective view showing the cell housing of FIG. 4 together with a second wiring board coupled thereto. [Figure 6] FIG. 2 is a perspective view showing a seal member support body. [Figure 7] 7 is a perspective view showing the cell housing of FIG. 5 together with the seal member support body of FIG. 6. FIG. [Figure 8] FIG. 2 is a cross-sectional view showing the battery pack. [Figure 9] FIG. 1 is a perspective view of the battery pack with the housing partially removed. [Figure 10] FIG. 2 is a vertical cross-sectional view showing the battery pack. [Figure 11] FIG. 2 is a first cross-sectional view showing an electrical contact device of the battery pack. [Figure 12] FIG. 2 is a second cross-sectional view showing the electrical contact device of the battery pack. [Figure 13] FIG. 10 is a bottom view showing the cell housing with the protective member inserted therein. [Figure 14] FIG. [Figure 15]FIG. 4 is a cross-sectional view showing a guide rail of the battery pack. [Figure 16] FIG. 2 is a perspective view showing an interface housing of the battery pack. [Figure 17] FIG. 10 is a perspective view of an alternative embodiment of the battery pack with the housing partially removed. [Figure 18] FIG. 18 is a cross-sectional view of the electrical contact device of the battery pack of FIG. 17. [Figure 19] FIG. 10 is a perspective view of an alternative embodiment of a guard member. [Figure 20] FIG. 20 is a front view showing the battery pack together with the protective member of FIG. 19. [Figure 21] FIG. 10 is a cross-sectional view of an alternative embodiment of a mechanical interface. [Figure 22] FIG. 10 is a cross-sectional view of another alternative embodiment of a mechanical interface. [Figure 23] FIG. 10 is a cross-sectional view of a third alternative embodiment of a mechanical interface. [Figure 24] FIG. 10 is a cross-sectional view of a fourth alternative embodiment of a mechanical interface. DETAILED DESCRIPTION OF THE INVENTION

[0051] FIG. 1 shows a side view of a system 10 including a power consumer 14 configured as a manual machine tool 12 and a battery pack 18 configured as a battery pack 16 for the manual machine tool. The manual machine tool is thus configured as a battery-powered manual machine tool and receives energy from the battery pack 18 during operation. The manual machine tool 12 and the battery pack 18 have mechanical interfaces 20, 22, respectively, through which both components of the system 10 are removably coupled to each other. The battery pack 18 is thus configured as a replacement battery pack and can be replaced with an identical or similar battery pack. The manual machine tool 12 is, by way of example, a drill hammer 24. The manual machine tool 12 has a housing 26, the rear end of which is provided with a handgrip 28 equipped with an operating switch 30 for turning the manual machine tool 12 on and off. The front end of the housing 26 of the manual machine tool 12 is provided with a tool holder 31 for receiving an insert tool 32. A drive unit 38 having an electric motor 34 and a transmission 36 is arranged between the handgrip 28 and the tool holder 31. The transmission 36 includes a striking mechanism unit 40 and is arranged above the electric motor 34. The striking mechanism unit 40 includes a pneumatic striking mechanism. The striking mechanism may be, for example, an eccentric striking mechanism or an oscillating striking mechanism. Electronics 42 are arranged below the electric motor 34, through which the manual machine tool 12 can be adjusted or controlled. The battery pack 18 is arranged below the handgrip 28 and adjacent to the electronics 42. The handgrip 28 is coupled to the region of the housing 26 containing the drive unit 38 via a vibration-damping unit 29, so that vibrations emitted by the striking mechanism unit 40 are transmitted attenuated to the handgrip 28 and also to the mechanical interfaces 20, 22 between the manual machine tool 12 and the battery pack 18. In this way, the handgrip 28 is configured as a vibration-decoupled handgrip.The battery pack 18 and the power consumer 14 have corresponding electrical interfaces 44, 46, respectively, via which the battery pack 18 can be electrically connected to the power consumer 14, in particular to the electronics 42 of the power consumer 14. When coupled together, the battery pack 18 is responsible for the energy supply for the power consumer 14. The battery pack 18 has a weight that corresponds to approximately one-quarter of the total weight of the system 10. Due to the weight and arrangement of the battery pack 18, higher loads are generated in the area of ​​the mechanical interfaces 20, 22 during operation of the system 10.

[0052] FIG. 2 shows the battery pack 18 in a perspective view along with the mechanical interface 22. The battery pack 18 is removably mechanically coupled to the power consumer 14 via the mechanical interface 22. The battery pack 18 includes a multi-part housing 48, which is preferably made of a plastic-containing housing material. The housing 48 is preferably made of polycarbonate or high-density polyethylene (HD PE). The housing 48 is specifically configured as an outer housing. The housing 48 includes a cell housing 50, an interface housing portion 52, and two side housing portions 54. These housing portions 50, 52, and 54 are connected to one another via fasteners 56, which are preferably configured as screws. All of the housing portions 50, 52, and 54 are at least partially configured as outer housing portions.

[0053] A charge status indicator 58 is disposed on the front side of the battery pack 18, through which the charge status of the battery pack 18 can be displayed. The housing 48 of the battery pack 18 is particularly The interface housing portion 52 contains the mechanical interface 22 and the electrical interface 46 .

[0054] The battery pack 18 is configured as a slide-type battery pack, for example. The battery pack 18 slides toward the manual machine tool 12 along a coupling direction 23 to be coupled to the manual machine tool 12.

[0055] The mechanical interface 22 has a pair of holding members 60 that hold the battery pack 18 when it is coupled to the manual machine tool 12. The holding members 60 are configured as guide rails 62, for example. The holding members 60 extend substantially parallel to the coupling direction 23 of the battery pack 18. The holding members 60 or the guide rails 62 each have sliding surfaces 64 along which the housing 48 of the battery pack 18 slides when coupled to the housing 26 of the manual machine tool 12. When coupled to the manual machine tool 12, guide rails (not shown) of the mechanical interface 20 of the manual machine tool 12 abut against the sliding surfaces 64 of the guide rails 62. Thus, when coupled with the manual machine tool 12, particularly when the manual machine tool 12 is guided not parallel to the direction of action of the weight force of the battery pack 18, substantially the entire weight force of the battery pack 18 acts on the holding member 60 or guide rail 62 of the mechanical interface 22 via the sliding surface 64. Furthermore, the mechanical interface 22 of the battery pack 18 has a set of guide grooves 66. When coupled with the manual machine tool 12, the guide rails of the manual machine tool 12 are disposed in the guide grooves 66. The guide grooves 66 are disposed adjacent to the holding member 60 or guide rail 62. The guide grooves 66 extend through an upper wall surface 68, a side wall 70, and a lower wall surface 72. In particular, the upper wall surface 68 of the guide grooves 66 corresponds to the sliding surface 64 of the holding member 60. The wall surfaces 68, 70, 72 of the guide groove 66 extend parallel to the coupling direction 23 of the battery pack 18 in one direction and perpendicular or parallel to each other in another direction. Furthermore, the mechanical interface 22 of the battery pack 18 has a locking member 74. The locking member 74 is movably, particularly rotationally, supported by the housing 48 of the battery pack 18. The locking member 74 is configured to lock the manual machine tool 12 and the battery pack 18 in the coupled state. For example, the locking member 74 is configured as a locking member that engages with a notch (not shown) in the housing 26 of the manual machine tool 12.To release the friction-fit and form-fit connection, the battery pack 18 has an operating member 76 mechanically coupled to the locking member 74, via which the locking member 74 can be moved out of the notch when in the connected state. The operating member 76 is configured as a key member, for example, and can be operated parallel to the connecting direction 23.

[0056] Furthermore, the electrical interface 46 has five electrical contact members 80 (see FIG. 3 ). The electrical contact members 80 are arranged between the respective holding members 60. The electrical contact members 80 are configured, at least in part, for connection with electrical contact members (not shown) of the electrical interface 44 of the manual tool 12. Two of the electrical contact members 80 are configured as power contacts 82, through which an electric current flows during operation to supply energy to the manual tool 12. Three of the electrical contact members 80 are configured as additional contacts.

[0057] Furthermore, the system 10 has a mechanical coding 11, which ensures that only the combination of battery pack 18 and power consumer 14 intended by the manufacturer can be mechanically coupled to one another. The mechanical coding 11 includes a coding element 78 on the battery pack side and at least one coding element (not shown) on the power consumer side. The coding element 78 of the battery pack 18 is arranged on the outer surface of the housing 48. In particular, the coding element 78 is arranged between the respective holding elements 60 in the area of ​​the mechanical interface 22. The coding element 78 is configured as a single-piece molding integral with the interface housing part 52. The coding element 78 is configured as an elongated web extending transversely to both holding elements 60.

[0058] FIG. 3 shows an exploded view of the battery pack 18. Electronics 81 and, for example, ten battery cells 83 are arranged in the housing 48 of the battery pack 18. The battery pack 18 is configured as an 18-volt battery pack. The electronics 81 includes two circuit boards 85, 86 connected to each other via a plug connection 88. The first circuit board 85 is configured as a flexible circuit board. The battery cells 83 are housed in a cell housing 50. The battery pack 18 is configured as a two-layer battery pack 18, for example. The two-layer battery pack 18 here particularly means that the battery cells 83 are arranged in two layers, with the battery cells 83 arranged side by side in one layer on a single plane, and the number of battery cells 83 in one layer is not less than the number of cells in each layer. For example, one layer includes five battery cells 83. It is also conceivable that the battery pack 18 may be configured as a three- or four-tier battery pack, which increases the weight of the battery pack 18 and the corresponding load on the mechanical interface 22 of the battery pack 18 .

[0059] The cell housing 50 has receiving areas 88 in which only one accumulator cell 83 is arranged. The receiving areas 88 are each delimited by a wall 89 adapted to the shape of the accumulator cell 83. The wall 89 has an at least partially hollow cylindrical shape. The cell housing 50 has an axial opening 90 and a radial opening 92. Figure 4 shows an enlarged perspective view of the cell housing 50 with the accumulator cell 83 arranged in the receiving area 88.

[0060] The axial openings 90 extend substantially perpendicular to the longitudinal axis 93 of the accumulator cells 83 arranged in each receiving area 88. The axial openings 90 are configured for edge contact and / or for receiving the accumulator cells 83 in the receiving area 88. The axial openings 90 are configured substantially circular. The cell housing 50 preferably includes two axial openings 90 arranged on opposite sides of the cell housing 50 for each receiving area 88. Advantageously, the accumulator cells 83 can be received or inserted into the receiving area 88 through at least one of the axial openings 90. In particular, the opposing axial openings 90 are configured differently so that the accumulator cells 83 can be inserted into the receiving area 88 through only one of the opposing axial openings 90. The width of the cell housing 50 substantially corresponds to the length of the accumulator cells 83. The accumulator cells 83 are configured as round cells and have one cell pole 94 at each end. When the accumulator cells 83 are positioned in the receiving region 88, one cell pole 94 is located in each of the axial openings 90 and is thereby electrically accessible. The accumulator cells 83 are electrically connected to one another via cell connectors 96. The cell connectors 96 are arranged between the accumulator cells 83 and the lateral housing part 54. In particular, the axial openings 90 are at least partially, preferably completely, covered or closed by the cell connectors 96. The cell connectors 96 consist of metal plates that are connected to the accumulator cells 83, in particular to the cell poles 94 of the accumulator cells 83, in a materially bonded manner. This connection can be achieved, for example, by resistance welding or laser welding. The accumulator pack 18 has a plurality of cell connectors 96 that are connected to, for example, two or four accumulator cells 83 in a materially bonded manner. The accumulator cells 83 accommodated in the cell housing 50 are connected to the electronics 81, in particular to the second circuit board 86. In particular, the battery cell 83 contained in the cell housing 50 is connected to both power contacts 82 mounted on the second wiring board 86 via a cell connector 96 and two electrical contact devices 98 .

[0061] The radial openings 92 are intended for lateral contact of the battery cells 83. This lateral contact advantageously allows for individual cell monitoring, particularly individual cell voltage monitoring. In this context, lateral contact particularly refers to contact at the sides of the cell poles 94 of the battery cells 83. The cell housing 50 has an outer wall surface 100 and an inner wall surface 102. The outer wall surface 100 partially constitutes the outer surface of the battery pack 18 when the battery pack 18 is assembled, and the inner wall surface 102 is completely surrounded by the outer surface of the battery pack 18 when the battery pack 18 is assembled. The radial openings 92 are arranged in or on the inner wall surface 102. The radial openings 92 are, for example, rectangular and extend circumferentially around the battery cells 83. Four of the ten receiving regions 88 of the cell housing 50 have radial openings 92. In particular, each of the receiving regions 88 having radial openings 92 has two radial openings 92.

[0062] FIG. 5 also shows the assembled first wiring board 85. The first wiring board 85 is made of, for example, laminated copper tape, which forms electrical contact members 104 and electrical conductors. The first wiring board 85 abuts the cell housing 50, particularly the inner wall surface 102 of the cell housing 50. In particular, the first wiring board 85 abuts the side of the cell housing 50 where the radial openings 92 are located. The first wiring board 85 is flexibly configured to follow the outer contour of the cell housing 50 along its length. The electrical contact members 104 of the first wiring board 85 are configured as flexible contact tongues 106. The flexible contact tongues 106 are configured to enter one of the receiving areas 88 through the radial openings 92 and make electrical contact with the storage battery cells 83 arranged in the receiving area 88. In the connected state, the electrical contacts 104 abut against the accumulator cells 83, in particular laterally against the accumulator cells 83, making it possible to determine the voltage of each individual accumulator cell 83. The electrical contacts 104 are preferably fixed between the accumulator cells 83 and the wall 89 of the receiving area 88, for example by means of clamps.

[0063] Through the radial openings 92, electrical contact is possible, in particular with the accumulator cells 83 of the upper layer facing the electronics 81. By way of example, four of the five accumulator cells 83 of the upper layer are arranged in receiving areas 88 with radial openings 92. Alternatively, it is also conceivable that each of the accumulator cells 83 of the upper layer and / or also the accumulator cells 83 of the lower layer are electrically contactable for individual cell monitoring. Each receiving area 88 with radial openings 92 has two radial openings 92, through which two electrical contacts 104 are respectively connected to the accumulator cells 83. In this way, the accumulator cells 83 are connected laterally to the first circuit board 85 via four electrical contacts 104, which ensures redundancy that voltage monitoring of the accumulator cells 83 can continue even if one electrical contact 104 fails.

[0064] Furthermore, a display unit 108, which is configured, for example, as a charge state indicator, is arranged on the first circuit board 85. The display unit 108 has five display elements 110 configured as light-emitting elements, which are arranged on the side of the first circuit board 85 facing away from the cell housing 50. An operating element 112 is arranged next to the display elements 110, via which the first circuit board 85 can be controlled. For example, the display unit 108 can be activated and / or deactivated via the operating element 112.

[0065] The radial openings 92 are only partially covered by the first circuit board 85 or by the electrical contacts 104 of the first circuit board 85, thereby partially providing free access to the accumulator cells 83. To protect the lateral surfaces of the accumulator cells 83 exposed through the radial openings 92, the accumulator pack 18 has seals 114. The seals 114 are configured as soft plastic components 116 of a seal support 118, which further has a hard plastic component 120. The hard plastic component 120 of the seal support 118 is shown by dashed lines in FIG. 6 . The seal support 118 is shown in a perspective view in FIG. 6 . The seal support 118 is produced by a two-component injection molding process. The seal support 118 has a seal 114 for each radial opening 92, which seals the radial opening 92 when the seal support 118 is in a mated state. In particular, the surface of the seal member 114 is wider than the surface of the radial opening 92. In particular, the seal member support 118 has a first hard plastic component 122 and a second hard plastic component 124, which are movably connected to each other via a soft plastic component 116. The soft plastic component 116 preferably defines a joint 126 in the region between the first and second hard plastic components 122, 124. The first and second hard plastic components 124 are made of the same material. In particular, the hard plastic component 120 is made of a transparent plastic. The soft plastic component is made of rubber.

[0066] FIG. 7 shows a perspective view of the seal member support 118 assembled onto the flexible first wiring board 85. The flexible wiring board 85 is covered, particularly substantially completely, by the seal member support 118. To facilitate assembly of the seal member support 118, the seal member support 118 has positioning means 128, illustratively configured as circular notches, in the hard plastic component 120. The cell housing 50 has corresponding positioning means 130, illustratively configured as cylindrical pins. To ensure that dust cannot reach the accumulator cells 83 through the positioning means 128, illustratively configured as notches, a further seal member 132, implemented by the soft plastic component 116, is arranged in the notch. When assembled, the positioning means 128 of the seal member support 118 and the positioning means 130 of the cell housing 50 engage with each other, positioning the seal member 114 above the radial opening 92 and sealing it.

[0067] When assembled, the first and second hard plastic components 122 and 124 are arranged on different sides of the cell housing 50, specifically on different sides of the inner wall 102 of the cell housing 50. The first hard plastic component 122 is arranged on the side of the cell housing 50 facing the electronics 81. The seal 114 and the positioning means 128 are arranged or injection-molded onto the first hard plastic component 122. The second hard plastic component 124 covers and protects the display element 110 of the display unit 108. The hard plastic component 120 is transparent, allowing light emitted from the display element 110 to escape. The second hard plastic component 124 also has an additional elastic seal 136 made of the soft plastic component 116 arranged above and sealing the operating element 112 of the display unit 108. A joint 126 consisting of the soft plastic component 116 between both hard plastic components 122, 124 is located in the transition area between both different sides of the cell housing 50 to allow an easy dust-sealed assembly.

[0068] FIG. 8 shows a cross-section A of the assembled battery pack 18. This cross-section extends, in particular, through the two radial openings 92 and the positioning means 128, 130 disposed therebetween. This cross-section shows that the seal member support 118 is disposed between the first and second wiring boards 85, 86 of the electronics 81. In particular, the first and second wiring boards 85, 86 abut against the seal member support 118. Through the radial openings 92, the electrical contacts 104 of the first wiring board 85 enter the receiving areas 88 of the battery cells 83 and make electrical contact therewith. The radial openings 92 are completely surrounded by the seals 114 of the seal member support 118, thereby preventing dust or other foreign particles from penetrating the receiving areas 88. Preferably, the battery cells 83 are surrounded on the side having the radial openings 92 by not only the cell housing 50 but also the interface housing part 52.

[0069] 9 shows the assembled battery pack 18 in a perspective view without the interface housing part 52 and side wall 54. The battery cells 83 are individually contacted and connected to the first circuit board 85 through the radial openings 92, while the battery cells 83 are connected to each other through the axial openings 90 and to the power contacts 82 of the second circuit board 86 via electrical contact devices 98. Contact areas 134 of the first circuit board 85 penetrate the seal member support 118 through cutouts 137 in the seal member support 118 and are connected to the second circuit board 86 via plug connections 138. The second circuit board 86 includes a computing unit, a memory unit, and a control unit for controlling or regulating the battery pack 18.

[0070] The battery pack 18 includes two electrical contact devices 98. One of the electrical contact devices 98 connects one of the power contacts 82 to the battery cell 83 via a copper flat connector 140. The other electrical contact device 98 connects the other power contact 82 to the battery cell 83 via a tubular conductor 142 and a fuse element 144. The fuse element 144 is configured as a melt-type fuse. The fuse element 144 has a cylindrical design. The fuse element 144 includes a ceramic sleeve 145, which houses a metal wire 147 (see FIG. 10 ). The metal wire 147 is configured as, for example, a silver wire. The metal wire 147 extends coaxially with the longitudinal axis of the ceramic sleeve 145 and exits from both ends of the ceramic sleeve 145. The fuse element 144 also includes two metal end caps 149, which allow the fuse element 144 to be electrically and mechanically coupled. These end caps 149 are shaped to surround the ceramic sleeve 145 in a first region 151 and surround the metal wire 147 not surrounded by the ceramic sleeve 145 in a second region 153. In particular, the end caps abut the ceramic sleeve 145 in the first region 151 and abut the metal wire 147 in the second region.

[0071] In particular, the accumulator cells 83 are connected in a material-bonding manner to metallic cell connectors 96 in the region where the accumulator cells 83 on the two edge sides of the upper and lower layers are connected via the cell connectors 96. The material-bonding between the cell connectors 96 and the accumulator cells 83 takes place on the side of the axial opening 90 of the cell housing 50. The cell connectors 96 are configured on their upper sides so as to be bent in the direction of the electrical contact devices 98 and have in this region a connecting surface 146 that extends substantially perpendicular to the axial opening 90. Via this connecting surface 146, the cell connectors 96 are connected in a material-bonding manner to metallic conductors 148, for example by means of a welded joint. The metallic conductors 148 are configured in the shape of a plate and extend parallel to the longitudinal axis of the accumulator cells 83.

[0072] The tubular conductor 142 is connected to the metal conductor 148 by a welded joint. The tubular conductor 142 and the metal conductor 148 are made of copper. The connection between the tubular conductor 142 and the metal conductor 148 is made at a first end 150 of the tubular conductor 142. In the region of the first end 150 of the tubular conductor 142, the tubular conductor 142 is bent downwards or towards the metal conductor 148. Furthermore, the tubular conductor 142 is configured to be flattened at the first end 150 in order to enable a material-joint connection with the metal conductor 148 by a welding method.

[0073] At the second end 152 of the tubular conductor 142, the tubular conductor 142 is mechanically and electrically coupled to the fuse element 144, in particular to one of the end caps 149 of the fuse element 144 or to a second region 153 of the end cap 149. At the second end 152 of the tubular conductor 142, the tubular conductor 142 has a cross-sectional change 154. This cross-sectional change 154 is designed so that the fuse element 144 or the end cap 145 of the fuse element 144 can be received inside the tubular conductor 142 and thus mechanically and electrically coupled thereto. In particular, the tubular conductor 142 is coupled to the fuse element 144 by a press fit in the region of the cross-sectional change 154. For example, the tubular conductor 142 can be configured by crimping in the region of the cross-sectional change 154, thereby allowing the tubular conductor 142 to be mechanically and electrically coupled thereto. 142 The inner diameter is reduced in the region of the second end 152.

[0074] The other end cap 149 of the fuse element 144 is connected to a power contact via an electrical conductor 155 configured, for example, as a flat connector 156. 82 Connected to do. At this time, one end of the flat connector 156 abuts against the end cap 149 of the fuse element 144, and the other end abuts against the power contact 82. The fuse element 144 and the flat connector 156 are coupled together through a hollow cylindrical integrally molded portion of the flat connector, which is coupled to the end cap 149, particularly to the first region 151 of the end cap 149.

[0075] FIG. 10 shows a longitudinal section of the electrical contact device 98. The tubular conductor 142 is formed from a hollow tube by a rolling process. The conductor cross-section is substantially constant over the length of the tubular conductor 142. The shape of the tubular conductor 142 is adapted so that the inner diameter of the tubular conductor 142 varies between the first end 150 and the second end 152. In this context, "inner diameter" refers in particular to the diameter of the hollow space inside the tubular conductor 142. In particular, the tubular conductor 142 has a larger inner diameter in the region of the second end 152 than in the region of the first end 150, with the tubular conductor 142 having a maximum inner diameter between the two ends 150, 152. In the region of the second end 152, a cross-sectional transition 154 is arranged, which has a circular cross-section substantially corresponding to the outer contour of the adjacent end cap 149 of the fuse element 144. 11 shows a cross section of the hollow cylindrical region between the two ends 150, 152, where the inner diameter is greatest. To realize a hollow conductor cross section, the tubular conductor 142 has a wall thickness in this region that substantially corresponds to the inner diameter. In the region of the first end 150, the tubular conductor 142 is flattened so that the inner diameter is minimal or zero, since the two opposite sides of the tubular conductor 142 abut against each other.

[0076] To protect the battery cells 83 in the event that the battery pack 18 is dropped, the battery pack 18 has protective elements 158. The protective elements 158 are shown in a perspective view in FIG. 9 and in a longitudinal cross-section of the battery pack 18 in FIG. 10. In FIG. 13, a bottom view of the battery pack 18 is shown without the side walls 54. The battery pack 18 has four protective elements 158, two of which are arranged adjacent to the battery cells 83 to protect them. The protective elements 158 are made of metal plates, such as steel plates. In FIG. 14, the protective elements 158 are shown in a perspective view. The protective elements 158 are preferably arranged adjacent to the battery cells 83 in the area of ​​an edge 160 of the housing 48 of the battery pack 18. If the battery pack 18 is dropped on one of the edges 160, the entire force of the collision acts over a small area, and therefore the risk of damage or deformation of the housing 48 or the battery pack 18 is particularly great. The edge 160 in this case is, in particular, an edge 160 located in the transition region from the underside or installation surface 162 of the battery pack 18 to the front surface 164 or rear surface 166. The installation surface 162 is located, in particular, on the side of the battery pack 18 facing the side having the mechanical interface 22 of the battery pack. The front surface 164 has the display unit 108 and extends substantially perpendicular to the installation surface 162. The rear surface 166 is located opposite the front surface 164. In particular, the battery cells 168 on the edge side of the battery pack 18, preferably the battery cells 168 on the edge side of the lower layer of battery cells 83 of the battery pack 18, are partially surrounded by the protective element 158. Edge battery cells 168 are understood in this context to mean in particular the first and last battery cells of a layer of battery cells 83 .

[0077] The accumulator cells 83 accommodated in the accommodation areas 88 are surrounded circumferentially by the wall 89 of the cell housing 50. In this way, the cell housing 50, which is made of plastic, such as HDPE, already partially protects the accumulator cells 83 from the action of forces in the event of a fall. This protection is strengthened by the fact that the edge-side accumulator cells 168 are additionally partially surrounded circumferentially by the protective elements 158. In particular, the edge-side accumulator cells 168 are surrounded circumferentially by the protective elements 158 over an angular range α of approximately 170°. For each protective element 158, the cell housing 50 has an accommodation pocket 170 that is designed for a friction- and form-fit connection with the protective element 158. In the accommodation pocket 170 of the cell housing 50, the protective elements 158 are surrounded by the cell housing 50 on two opposite sides and are held friction-fit. When the cell housing 50 and the protective element 158 ​​are joined, the protective element 158 ​​is pushed into the receiving pocket 170 until it abuts against a stop, thereby preferably electrically insulating the metal protective element 158 ​​from the accumulator cells 83 or the electronics 81 of the accumulator pack 18. Both the wall 89 of the cell housing 50 that delimits the receiving area 88 and the abutting protective element 158 ​​are adapted in terms of their shape to the cylindrical contour of the accumulator cells 83 and are configured in particular curved.

[0078] The cell housing 50 has two adjacent pairs of receiving pockets 170, each of which is configured so that the protective elements 158 are received laterally in the cell housing 50 by opposing movements (see FIG. 13). The length of the protective elements 158 corresponds to approximately 45% of the length of the battery cells 83, or approximately 45% of the width of the cell housing 50. The two protective elements 158 are arranged one behind the other in the receiving pockets 170, such that the edge-side battery cells 168 are surrounded by the protective elements 158 by approximately 90% of their respective lengths. Alternatively, the edge-side battery cells 168 could each be protected by a single continuous protective element.

[0079] FIG. 15 shows a cross section of the holding element 60 configured as a guide rail 62. A guide groove 66 is arranged adjacent to or below the holding element 60. The guide rail 62 or the holding element 60 is made of plastic. The guide rail 62 or the holding element 60 is particularly configured as an integral part of the interface housing part 52. To ensure that a defined break occurs in the event of an overload of the mechanical interface 22 or the holding element 60, and thus that random breaks do not occur, the mechanical interface 22 has a predetermined break point 182. The predetermined break point 182 is arranged in the region of the holding element 60. In particular, the predetermined break point 182 is arranged between the sliding surface 64 of the mechanical interface 22 and an upper side 184 of the holding element 60 facing the sliding surface 64. The predetermined break point 182 is particularly configured as a precisely weakened portion of the plastic material. In the region of the planned breaking point 182, the material thickness 186 of the retaining element 60 changes suddenly and / or significantly. The material thickness 186 may be, for example, the thickness of the retaining element 60 or the maximum distance from the upper side 184 of the retaining element 60 to the sliding surface 64. A "sudden" change is intended here to mean, in particular, a discontinuous change in the material thickness 186. A "significant" change is intended here to mean, in particular, a reduction in the material thickness 186 of at least 50% of the original material thickness, in particular a reduction in the material thickness 186 of at least 30% of the original material thickness, and preferably a reduction in the material thickness of at least 15% of the original material thickness. For example, the material thickness 186 at the planned breaking point 182 is reduced in two adjacent regions in the illustrated cross section by approximately 15% of the original material thickness 186.

[0080] The breakage point 182 is embodied by a breakage point element 188, which is made of a metal plate, for example made of steel. The breakage point element 188 is connected to the holding element 60. In particular, the breakage point element 188 is at least partially surrounded by the holding element. In the illustrated embodiment, the breakage point element 188 is configured as a leg 190 of an elbow element 192, in particular a metal elbow. The elbow element 192 has, for example, two legs 190, 194 extending at right angles to each other. For example, the legs 190, 194 have different lengths in cross section. However, other angles between the legs 190, 194 are also conceivable as an alternative. The elbow element 192 is configured as a single piece. The leg 190 of the elbow element 192 configured as the breakage point element 188 extends substantially perpendicular to the sliding surface 64 of the holding element 60. In particular, the difference between material thickness 186 and the height of intended breakage point member 188 substantially corresponds to the height of intended breakage point 182 .

[0081] When coupled with the manual tool 12, the force of the weight of the battery pack 18 acts primarily on the sliding surface 64 of the mechanical interface 22 via the guide rail of the manual tool 12, which is disposed in the guide groove 66. To implement the breakage point 182 as effectively as possible, the breakage point 182 is disposed adjacent to or directly adjacent to a plane 196 that extends substantially congruent with the side wall 70 of the guide groove 66. In the illustrated embodiment, the breakage point member 188 is disposed to extend substantially parallel to the plane 196. In particular, the breakage point member 188 is disposed adjacent to the plane 196 by having an outer surface 198 of the breakage point member 188 extend above the plane 196.

[0082] Furthermore, the battery pack 18, and in particular the mechanical interface 22, has a wear protection element 200. The wear protection element 200 is, for example, configured as the second leg 194 of the elbow element 192 and thus integral with the breakage point element 188. The wear protection element 200 extends parallel to the sliding surface 64. In particular, the wear protection element 200 at least partially configures the sliding surface 64 of the holding element 60. The wear protection element 200 is partially surrounded by the holding element 60 and / or the guide rail 62. Advantageously, the wear protection element 200 significantly reduces wear that occurs between the guide rail 62 of the battery pack 18 and the guide rail of the manual machine tool 12 during operation of the manual machine tool 12. The wear protection element 200 is, for example, configured from metal.

[0083] 16 shows a perspective view of the interface housing part 52. The elbow element 192, which is injection molded onto the retaining element 60 or the guide rail 62, is shown in dashed lines and includes a breakaway element 188 and a wear protection element 200. To allow for as defined a breakaway as possible via the breakaway element 182, the length of the elbow element 192 or the breakaway element 188 corresponds to approximately 80% of the length 202 of the retaining element 60 or the sliding surface 64 of the retaining element 60.

[0084] 17 shows a perspective view of a battery pack 18a having an alternative embodiment of an electrical contact device 98a including a tubular conductor 142a, where the battery pack 18a is constructed substantially identically to the battery pack 18 described above, except for the tubular conductor 142a. The tubular conductor 142a has a first end 150a and a second end 152a. aThe tubular conductor 142a is connected at its second end 152a to a fuse element 144a configured as a meltable fuse via a cross-sectional change 154a. The tubular conductor 142a is directly connected to the cell connector 96a by material contact at its second end 152a. This is realized by bending the tubular conductor 142a in two directions at its second flattened end 152a. On the one hand, the tubular conductor 142a is bent downward at its second end 152a, or toward the side of the cell housing 50a having the radial opening 92a, and on the other hand, it is bent outward, or toward the side of the cell housing 50a having the axial opening 90a.

[0085] FIG. 18 shows a cross section of the tubular conductor 142a. A heat storage member 157a is disposed inside the tubular conductor 142a. The heat storage member 157a is made of, for example, plastic, particularly HD PE (high-density polyethylene). The heat storage member 157a has the advantage of absorbing and temporarily storing heat generated inside the tubular conductor 142a when current is applied. The absorbed energy is delayed by the heat storage member 157a before being released back into the surroundings, thereby significantly reducing the amplitude of temperature fluctuations. The heat storage member 157a preferably fills substantially the entire tubular conductor 142a between the flattened end 152a and the cross-sectionally varying portion 154a.

[0086] FIG. 19 shows a perspective view of an alternative embodiment of the protective element 158b. FIG. 20 shows a front view of an alternative embodiment of the battery pack 18 with the protective element 158b. For better visibility, the cell housing 50b is depicted as transparent in FIG. 20, and the sidewalls are not shown. The battery pack 18b includes only one protective element 158b for each battery cell 168b on the edge side of the lower layer of battery cells 83b. The protective element 158b has a length substantially corresponding to the length of the battery cell 83b. The cell housing 50b includes a receiving pocket 170b in which the protective element 158b is received. The receiving pocket 170b does not have a stopper, allowing the protective element 158b to be inserted partially through the receiving pocket 170b for connection with the cell housing 50b. The guard 158b circumferentially surrounds the edge battery cell 168b over an angular area of ​​approximately 170° according to the previous embodiment.

[0087] Furthermore, the protective member 158b includes energy absorbing members 172b. The energy absorbing members 172b are arranged on two opposing longitudinal edges 174b of the protective member 158b. The longitudinal edges 174b extend parallel to the longitudinal axis of the storage battery cell 83b. The energy absorbing members 172b are, for example, configured as a meshing portion having teeth 176b, each of which has a tip 178b. The tips 178b of the teeth 176b abut against the cell housing 50b in the assembled state, particularly against the wall 180b inside the storage pocket 170b. In particular, the protective member 158b abuts against the flat wall of the cell housing 50b only along the longitudinal edges 174b via the teeth 176b or the tips 178b. However, it is also conceivable that the protective element 158b rests along its longitudinal edge 174b against the interior wall of the receiving pocket 170b, which has a contoured engagement, in particular an engagement with the protective element 158b. Alternatively or additionally, it is also conceivable that the energy absorbing element 172b is arranged in the region of its longitudinal edge 174b at a distance from an internal stop of the receiving pocket 170b, this distance preferably being shorter than the height of the toothed elements 176b.

[0088] If the battery pack 18b is dropped on its edge 160b, a force acts on the guard member 158b, which causes the guard member 158b to deform and / or change position, causing the energy absorbing member 172b, particularly the engaging tip 178b, to enter and deform inside the cell housing 50b. The deformation of the cell housing 50b advantageously absorbs energy and does not act on the battery cell 83b, which is preferably protected.

[0089] 21 shows an alternative embodiment of a battery pack 18c with a predetermined breaking point 182c in cross section through a holding element 60c configured as a guide rail 62c. The predetermined breaking point 188c is arranged in a direction parallel to the connecting direction of the battery pack 18c or the sliding surface 64 of the battery pack 18c. cThe predetermined breaking point member 188c is configured as a metal plate extending parallel to the longitudinal direction of the retaining member 60c. In cross section, the predetermined breaking point member 188c has a length or height greater than the material thickness 186c of the retaining member 60c. The predetermined breaking point member 188c is surrounded by the interface housing 52c. The predetermined breaking point member 188c forms the side wall 70c of the guide groove 66c and is arranged to extend linearly toward the upper side 184c of the retaining member 60c. In this way, the predetermined breaking point member 188c extends perpendicular to the sliding surface 64c. The area between the predetermined breaking point member 188c and the upper surface 184c constitutes the predetermined breaking point 182c.

[0090] 22, another alternative embodiment of a battery pack 18d having a predetermined breaking point 182d is shown in cross section through a holding member 60d configured as a guide rail 62d. The predetermined breaking point 188d is connected to the interface housing part 52d or the holding member 60d. d The breakage point member 188d is made of a plastic having low adhesion to the plastic from which the battery pack 18d is constructed. The breakage point member 188d is rod-shaped and has a rectangular cross section, extending parallel to the connection direction of the battery pack 18d or parallel to the longitudinal direction of the sliding surface 64d of the battery pack 18d. The breakage point member 188d is entirely disposed within the holding member 60d. In particular, the breakage point member 188d is entirely disposed between the sliding surface 64d and the upper side 184d of the holding member 60d. Thus, the holding member 60d has two breakage points 182d: one breakage point member 182d is disposed between the breakage point member 188d and the upper side 184d of the holding member 60d, and the other breakage point member 182d is disposed between the breakage point member 188d and the sliding surface 64d. In cross section, the breakage points 188d extend obliquely relative to the sliding surface 64d. Thus, the breakage points 182d are offset from one another. Alternatively, the breakage points 188d may extend substantially perpendicular to the sliding surface 64d, resulting in two breakage points 182d positioned one above the other.

[0091] FIG. 23 shows another alternative embodiment of a battery pack 18e having a breakage point 182e in cross section through a holding member 60e configured as a guide rail 62e. The breakage point 188e is rod-shaped and arranged parallel to the sliding surface 64e in cross section. The breakage point 188e is completely surrounded by the interface housing part 52e, particularly by the holding member 60e. The breakage point 188e is spaced closer to the sliding surface 64e than to the upper side 184e of the holding member 60e. The breakage point 188e is configured, for example, as a hollow space, which locally weakens the holding member 60e. The breakage point 182e is thus located between the breakage point 188e and the sliding surface 64e.

[0092] 24 shows another alternative embodiment of a battery pack 18f having a predetermined breaking point 182f in a cross section of a holding member 60f configured as a guide rail 62f. The predetermined breaking point 188f is configured as a leg 190f of an elbow member 192f. The elbow member 192f is configured as a metal elbow. The elbow member 192f further has a second leg 194f configured as a wear protection member 200f. Both elbow legs 190f, 194f are configured, by way of example, to have equal lengths in cross section. The predetermined breaking point 188f extends perpendicular to the sliding surface 64f of the holding member 60f, whereas the wear protection member 200f is configured to be in contact with the sliding surface 64f. f . The elbow is disposed entirely within the retaining member 60f, and in particular, entirely between the sliding surface 64f and the upper side 184f of the retaining member 60f. The predetermined breaking point 182f is disposed between the predetermined breaking point member 188f and the upper side 184f of the retaining member 60f. Because the wear guard 200f is initially entirely surrounded by the retaining member 60f, and in particular by the plastic of the retaining member 60f, the wear guard 200f does not become functional until a certain amount of wear has occurred and the plastic has at least partially separated between the sliding surface 64f and the wear guard 200f. [Explanation of symbols]

[0093] 12 Manual machine tools 18 Battery pack 22 Mechanical Interface 48 Housing 50 cell housing 83 Battery Cells 88 Containment Area 89 Wall 93 Longitudinal 158 Protective Materials 160 Edge 170 storage pockets 172b Energy absorbing member

Claims

1. A battery pack (18) for housing one or more battery cells (83) for supplying power to a power consumer (14), comprising: a cell housing (50) containing one or more battery cells (83); a mechanical interface (22) for removably coupling the battery pack (18) to the power consumer (14); Equipped with The mechanical interface (22) comprises: a holding member (60) on which the weight of the battery pack (18) accommodating the one or more battery cells (83) acts when the power consumption unit (14) and the battery pack (18) accommodating the one or more battery cells (83) are in a coupled state; a predetermined breaking point (182) provided on the holding member (60), which breaks so as to release the connection between the battery pack (18) and the power consuming unit (14) when a physical force greater than a predetermined magnitude that is greater than the weight acts on the mechanical interface (22); A battery pack (18) comprising:

2. The holding member (60) includes a guide rail (62) extending in a predetermined first direction, The power consumption unit (14) is coupled to the battery pack (18) by being guided in the first direction by the guide rail (62); The battery pack (18) of claim 1, wherein the predetermined breaking point (182) extends along the first direction.

3. the mechanical interface (22) has a predetermined break point member (188) for facilitating the break of the predetermined break point (182) when the physical force is applied; the predetermined breaking point member (188) is provided entirely or partially inside the retaining member (60), extends along the first direction, and is made of a material different from that of a portion of the mechanical interface (22) other than the predetermined breaking point member (188); 3. The battery pack (18) according to claim 2, wherein the predetermined breaking point (182) is provided between all or a portion of the predetermined breaking point member (188) inside the holding member (60) and the surface of the holding member (60).

4. 4. The battery pack (18) of claim 3, wherein the predetermined breaking point member (188) is made of plastic or metal.

5. The battery pack (18) according to claim 3 or 4, wherein the predetermined breaking point member (188) has an L-shape or a rectangular shape when viewed along the first direction.

6. The mechanical interface (22) is provided with a hollow space for promoting rupture at the predetermined rupture point (182) when a physical force equal to or greater than the predetermined magnitude is applied thereto; The hollow space is entirely or partially provided inside the holding member (60) and extends along the first direction; 3. The battery pack (18) according to claim 2, wherein the predetermined breaking point (182) is provided between all or part of the hollow space in the holding member (60) and a surface of the holding member (60).

7. The battery pack (18) according to claim 6, characterized in that the shape of the hollow space when viewed along the first direction is L-shaped or rectangular.

8. The length of the predetermined breaking point (182) in a second direction perpendicular to the first direction is 25% or more of the length of the holding member (60) in the second direction; The battery pack (18) according to any one of claims 2 to 7, characterized in that the second direction is a direction in which the planned breaking point (182) causes a tear in the retaining member (60) when it breaks.

9. The battery pack (18) according to any one of claims 2 to 8, characterized in that the guide rail (62) has a sliding surface (64) for guiding the power consumption unit (14) by sliding, and the sliding surface (64) is provided with an anti-wear member (200) for preventing wear due to sliding of the power consumption unit (14).

10. 10. The battery pack (18) of claim 1, wherein the predetermined breaking point (182) is configured to keep the inner surface of the cell housing (50) unchanged to protect the one or more battery cells (83) in the battery pack (18) when the physical force acts on the mechanical interface (22).

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