WO2018233812A1

WO2018233812A1 - Retaining device for an energy store, electrical energy storage device, and electrical device

Info

Publication number: WO2018233812A1
Application number: PCT/EP2017/065078
Authority: WO
Inventors: Bernhard Beck; Jörg SCHMID; Faruk GÜLER; Mathias GLAAB; Daniel KOLBERT
Original assignee: Alfred Kärcher SE & Co. KG
Priority date: 2017-06-20
Filing date: 2017-06-20
Publication date: 2018-12-27
Also published as: DE112017007660A5

Abstract

The invention relates to a retaining device for at least one electrical energy store, in particular in the form of a battery, comprising at least one energy store housing for the at least one electrical energy store, the at least one energy store housing defining an energy store receiving chamber for the at least one electrical energy store, and the at least one energy store housing being sleeve-shaped or substantially sleeve-shaped, defining a longitudinal axis, and comprising an outer wall surrounding at least sections of the longitudinal axis. In order to improve said retaining device such that an electrical energy storage device and an electrical device which comprise the retaining device operate with as little impairment as possible, according to the invention the outer wall comprises a first outer wall portion and at least one second outer wall portion adjoining the first outer wall portion, the first outer wall portion defines a constant inner cross-sectional surface, and the second outer wall portion tapers away from the first outer wall portion. The invention also relates to an improved electrical energy storage device and an improved electrical device.

Description

Holding device for energy storage, electrical

Energy storage device and electrical appliance

The present invention relates to a holding device for at least one electrical energy storage, in particular in the form of a battery, comprising at least one energy storage housing for the at least one electrical energy storage, which defines at least one energy storage housing an energy storage space for the at least one electrical energy storage, wherein the at least one energy storage housing hüisenförmig or is substantially hüisenförmig, defines a longitudinal axis and comprises a longitudinal axis at least partially surrounding the shell wall.

Furthermore, the present invention relates to an electrical energy storage device, in particular in the form of a battery pack, for an electrical appliance, which electrical energy storage device comprises a housing, which housing defines a receiving space in which at least one electrical energy store is accommodated, wherein the at least one electrical energy store in a holding device is held for at least one electrical energy storage.

Moreover, the invention relates to an electrical appliance with at least one electrical load, which is at least partially, in particular completely, accommodated in a device housing, and at least one electrical energy storage device.

Holding devices, electrical energy storage and electrical appliances of the type described above are known in numerous variants. In particular, such devices are described in US 2006/0055371 AI. Holding devices of the type described above are used for a defined positioning of one or more electrical energy storage. On the other hand, they also serve to dissipate or dissipate heat generated during charging and discharging electrical energy storage is away from the energy storage. If the energy storage housing as large as possible on the electrical energy storage, heat generated can be easily removed. If the jacket wall of the energy storage housing and the electrical energy store are slightly spaced apart so that an insulating air layer can form between them, the generated heat can not be dissipated optimally. Since rechargeable batteries, in particular lithium-ion cells, may only be operated within a predetermined temperature range, optimum dissipation of generated heat is of great importance. Good heat dissipation allows for faster charging with higher currents and higher current discharge. A shutdown of an electrical energy storage device due to reaching a temperature limit for the at least one electrical energy storage during charging or discharging thereof can then be partially prevented or at least delayed in time.

It is therefore an object of the present invention, a holding device, an electrical energy storage device and an electrical appliance of the type described above to improve so that operation of the electrical energy storage device and the electrical device is affected as little as possible.

This object is achieved in a holding device of the type described above according to the invention that the jacket wall comprises a first shell wall portion and at least one adjoining second shell wall portion and that the first shell wall portion defines a constant internal cross-sectional area and that the second shell wall portion in a direction from the first shell wall portion pointing away rejuvenated. Such a further developed holding device makes it possible in particular to introduce an electrical energy storage in the energy storage receiving space, so that the best possible thermal contact between the energy storage and the energy storage housing can be made. In particular, the second jacket wall section makes it possible to compensate for manufacturing tolerances both in the electrical energy store and in the holding device, in particular in the design of the energy store housing. Preferably, the second casing wall portion may be formed somewhat deformable, so as to optimally adapt to the electrical energy storage. Thus, a good thermal contact between the at least one energy storage housing and an arranged in this electrical energy storage can be produced. It goes without saying for the person skilled in the art that dimensions of the energy storage housing are selected such that, ideally, the inner cross-sectional area of the first jacket wall section corresponds or essentially corresponds to an outer cross-sectional area of the electrical energy store. A length of the first casing wall section relative to the longitudinal axis is, for example, about one quarter of an overall length of the energy storage casing. Thus, therefore, a length of the at least one second jacket wall portion is about three quarters of the total length of the energy storage housing. If two second casing wall sections are provided, they may in particular have the same length, that is to say in each case approximately one length corresponding to three eighths of the total length of the energy storage casing. In particular, the holding device may be designed to hold only a single energy store. The holding device may for example be permanently attached to an electrical appliance or removable from this.

It is favorable if the first casing wall section defines a circular or polygonal inner cross section. Such a holding device is advantageously used in particular in connection with cylindrical or parallelepiped energy storage. Preferably, the at least one second casing wall section tapers conically. A cone angle can be in particular in a range up to a maximum of 10 °, in particular up to a maximum of 5 °. A conical taper is particularly advantageous in connection with cylindrical energy storage, so-called round cells. In particular, a round cell can be inserted into the energy storage housing in a simple manner. Optionally, the second casing wall section can be designed to be expandable in order to expand a decreasing inner cross section of the second casing wall section starting from a basic position. In particular in the region of the second jacket wall section, a particularly good contact of the jacket wall with the energy store and thus optimum heat transfer can be achieved.

It is advantageous if the holding device is designed to receive a plurality of electrical energy storage. In particular, it may be designed for two, three, four, five, ten or twenty energy stores. Thus, electrical energy storage devices can be obtained with desired nominal voltages by appropriate series and / or series connections of the electrical energy storage.

Preferably, the holding device comprises a plurality of energy storage housings, which each define an energy storage receiving space for a single electrical energy storage. In other words, each energy storage housing is designed to receive all or part of an electrical energy storage. For example, if the holding device is formed in two parts, an electrical energy store can be partially accommodated in an energy storage housing of the one part and partially in an energy storage housing of the other part of the holding device. In particular, the fact that only a single electrical energy storage can be completely or partially absorbed in the energy storage housing, a particularly good heat transfer from the electrical energy storage can be ensured on the energy storage housing. Conveniently, the holding device is formed in one piece or in two parts. A two-part holding device allows easy mounting, because in particular it is possible to postpone the two-part holding device from both sides to an electrical energy storage.

Advantageously, the two-part holding device comprises a first and a second holding device part. These are preferably formed completely separated from each other and are connected to each other via the at least one electrical energy storage, which they each take in part.

Particularly easy to manufacture is the holding device when the first and the second holding device part are arranged relative to each other mirror-symmetrical or substantially mirror-symmetrical and / or formed. The mirror-symmetrical arrangement also simplifies the assembly, since it is directly recognizable how the holding device parts must be brought into engagement with the electrical energy stores.

In order to further simplify both the construction and the manufacture of the holding device, it is expedient for the first and the second holding device part to be identical or substantially identical.

According to another preferred embodiment of the invention, it can be provided that the at least one second casing wall section has at least one casing wall slot extending parallel or substantially parallel to the longitudinal axis, which extends starting from a free end of the second casing wall section in the direction of the first casing wall section. This refinement makes it possible, in particular in a simple manner, for the second jacket wall section to expand or widen when an electrical energy store is inserted and thus to be able to optimally adapt or conform to the electrical energy store. If at least two jacket wall slots are provided, they separate circumferentially from one another with respect to the longitudinal axis of separate parts of the second jacket wall section. These parts or wings of the second casing wall section may in particular be designed to be deformable, in order to allow optimum adaptation of the second casing wall section to the electrical energy store. The at least one jacket wall slot may extend from the free end of the second jacket wall section to the first jacket wall section. It can also be shorter. If several jacket wall slots are provided, they can also have a different length. However, they can also be identically long.

Furthermore, it is favorable if the at least one jacket wall slot has a constant or varying width in the circumferential direction with respect to the longitudinal axis. In particular, the width may increase in the direction of a free end of the second casing wall portion. This simplifies production of the holding device, in particular if it is formed by plastic injection molding. Preferably, the at least one jacket wall slot extends over a circumferential angle of less than 20 °. Thus, a sufficient thermal contact between the second casing wall portion and the electrical energy storage can be achieved.

In order to achieve a spreading of the at least one second jacket wall section in a simple manner, it is advantageous if the at least one second jacket wall section has two, three, four, five or more jacket wall slots.

Preferably, at least two lateral wall slots have a different width in the circumferential direction relative to the longitudinal axis. Thus, a different deformation of adjacent to the casing wall slots areas or parts of the at least one second casing wall portion can be achieved specifically.

It is advantageous if the at least one second casing wall section is elastically resilient and / or flexible. In particular, he can do this be formed of a suitable material, for example of a plastic. Furthermore, a flexibility can essentially be set by a thickness of the jacket wall in the region of the second jacket wall section. An elastically resilient configuration makes it possible, in particular, for the at least one second casing wall section, which tapers in the inner cross section, to spread outward after introduction of an electrical energy store with a constant outer cross section, ie away from the longitudinal axis, and thus be able to rest against the electrical energy store with a certain prestress , So a particularly good heat transfer can be achieved.

Furthermore, it is advantageous if the jacket wall has two second jacket wall sections which adjoin the first jacket wall section on both sides. In other words, the at least one energy storage housing can thus be formed by three casing wall sections, namely a central first casing wall section and the second casing wall sections adjoining at one end thereof, which taper towards their free ends facing in opposite directions. In this way, an electrical energy storage can be safely absorbed and kept in the energy storage housing.

It is advantageous if the at least one second jacket wall section comprises at least one energy storage retention element which limits an insertion depth of the energy store into the energy storage receiving space. If two second casing wall sections are provided, at least one energy storage retention element can be provided on both casing wall sections, in particular in the case of a one-part design of the holding device. In a two-part design of the holding device, at least one energy storage retention element is preferably arranged or formed only on one of the two casing wall sections.

In a simple way, the holding device can be formed if the at least one energy storage retention element in the form of a toward the longitudinal axis facing annular flange is formed and arranged at the free end of the at least one second casing wall portion. The annular flange may in particular be interrupted and have one or more annular flange sections. An interruption can in particular be formed by the at least one jacket wall slot.

In order to achieve a particularly good heat dissipation from the at least one electrical energy store to the holding device, it is favorable if the casing wall encloses at least 70%, preferably at least 80%, of the energy storage receiving space. With a suitable choice of the dimensions of the electrical energy storage and the energy storage housing so good thermal contact between the energy storage housing and the electrical energy storage can be achieved with the specified coverage values.

Advantageously, an inner diameter defined by the first casing wall section is adapted to, corresponds to or essentially corresponds to an outer diameter of the energy store. In particular, it can thus be ensured that a good heat transfer from the electrical energy store to the holding device can also be achieved in the region of the first jacket wall section.

It is advantageous if the jacket wall has at least one jacket wall opening for a temperature sensor. In particular, a temperature sensor can be used in this casing wall opening, with which a temperature of the electrical energy storage device can be measured and then optionally monitored.

In a particularly simple manner, the holding device can be formed when the casing wall opening is circular or substantially circular. Thus, in particular cylindrical or substantially cylindrical temperature sensors can be used in a simple manner. It is advantageous if the holding device comprises a printed circuit board holding device for holding a printed circuit board. In this way, a printed circuit board, which comprises, for example, a circuit arrangement for monitoring one or more functions of the electrical energy storage device, can be arranged in a simple manner. An assembly of the electrical energy storage device can be simplified so.

It is particularly easy to arrange a printed circuit board on the holding device if the printed circuit board holding device has at least one holding recess for a printed circuit board.

Preferably, the holding device comprises two, three, four or more retaining recesses. Thus, the printed circuit board can be easily and securely fixed in particular against movement in different directions.

Conveniently, the at least one retaining recess is designed in the form of a receiving groove. In these, a circuit board can be easily inserted. In addition, it can be produced in a simple manner.

According to a further preferred embodiment of the invention, it can be provided that the at least one holding recess is formed on a holding projection protruding in the radial direction with respect to the longitudinal axis from the casing wall, in particular from the at least one second casing wall section. This makes it possible, in particular, to position and fix the printed circuit board at a distance from the energy storage housing or the energy storage housings on the holding device.

A particularly compact electrical energy storage device can be formed if the at least one holding recess defines a recess plane which extends parallel to the longitudinal axis. For example, a printed circuit board can be positioned in parallel over a plurality of mutually parallel energy stores. Furthermore, it is favorable if the at least one energy storage housing has at least one connecting element for bringing into engagement with an electrically conductive contact element. In particular, the at least one connecting element can be designed so as to project away from a free end of the second casing wall section, pointing parallel to the longitudinal axis. For example, the connecting element may be designed in the form of a connecting projection or a connecting receptacle which can be brought into positive and / or positive engagement with a corresponding connecting element on the contact element. The at least one connecting element can in particular serve to temporarily fix the contact element to the holding device in order to finally connect the contact element, for example by soldering, to a printed circuit board.

The holding device can be designed in a simple and cost-effective manner if it is produced in one piece or in two pieces from a plastic by injection molding.

Preferably, the plastic is or contains polycarbonate (PC), high density polyethylene (HDPE), acrylonitrile-butadiene-styrene copolymer (ABS), polycarboxylate with acrylonitrile-butadiene-styrene copolymer and / or polyamide (PA). These plastics can be processed in particular by injection molding. Furthermore, they have a sufficient thermal conductivity. Elastic properties of these plastics also allow optimum adaptation, in particular of the at least one second jacket wall section, to an electrical energy store.

It is favorable if the jacket wall has a thickness in a range of about 1 mm to about 5 mm, in particular it can be in a range of about 2 mm to about 3 mm. To provide a jacket wall in a thickness in the specified range, allows a sufficiently good heat dissipation with good stability and the lowest possible weight of the fixture. In order to further improve the stability of the holding device, it is advantageous if at least one stiffening element is arranged or formed on the at least one energy storage housing. For example, this may be in the form of an annular flange projecting from the energy storage housing in the radial direction.

Preferably, the at least one stiffening element is designed in the form of a stiffening rib. This can be arranged or formed pointing away from the latter and from the energy storage housing in particular in relation to the longitudinal axis.

In order to enable unrestricted mobility of the at least one second casing wall section, it is favorable if the at least one stiffening element is formed on the first casing wall section.

According to a further preferred embodiment of the invention, it may be provided that the at least one stiffening element connects the first casing wall sections of a plurality of energy storage casings with each other. For example, the at least one stiffening element can define a stiffening element plane, which runs transversely, in particular vertically, to the longitudinal axes of all interconnected energy storage housings.

Preferably, the holding device comprises at least one support element for a display device. A display device may in particular be provided in an electrical energy storage device in order to indicate a state of charge, a temperature or other relevant parameters of the electrical energy storage device. Providing such a carrier element on the holding device makes it possible in particular to mount an energy store, optionally also a printed circuit board, as well as the display device as a unit, which can then be used, for example, in a housing of the electrical energy storage device as a whole. In particular, the described unit can thus also be easily inserted before insertion be fully tested in the housing of the electrical energy storage device to all its functions.

It is advantageous if the at least one carrier element defines a carrier element plane which extends transversely, in particular perpendicularly, to the recess plane. Thus, for example, the display device can be arranged in the region of an end face of the electrical energy storage device, a printed circuit board parallel to one side of the housing, which defines the largest surface.

It is advantageous if the holding device comprises a positioning device for positioning the holding device in a housing of an electrical energy storage device. Such a positioning device makes it possible in particular to position the holding device, in particular with energy stores arranged thereon and the like, in a defined manner in the housing of the electrical energy storage device. In particular, a movement of the holding device in the housing can be minimized or preferably completely restricted with the positioning device.

It is advantageous if the positioning device comprises at least one first positioning element, which is non-positively and / or positively engageable with at least one second, arranged on the housing of the energy storage device positioning. Of course, it is also possible to provide a plurality of first and a plurality of second positioning elements, which engage or engage with one another in a working position of the electrical energy storage device such that the holding device is held completely stationary in the housing of the electrical energy storage device.

The positioning device can be formed in a simple manner if the at least one first positioning element is designed in the form of a positioning projection or a positioning recess. In particular, the at least one second positioning element can be formed correspondingly, for example as a recess or receptacle for interacting with a positioning projection or as a positioning projection for interacting with a positioning recess.

The electrical energy storage device can be formed in a particularly simple and compact manner if the at least one first positioning element is arranged or formed on the at least one stiffening element.

It is advantageous if the positioning device comprises a plurality of positioning elements and if at least two of the plurality of positioning elements are designed differently dimensioned to form a tolerance compensation device. Tolerances can arise in particular during injection molding of the holding device or else during injection molding of the housing of the electrical energy storage device. If two or more positioning elements are dimensioned differently, for example positioning recesses having different widths, then manufacturing tolerances can be compensated for in a simple way. The positioning elements then form both a positioning device and a tolerance compensation device.

In a simple way, an electrical energy storage device can be formed if at least one end face of the at least one energy storage housing is closed or substantially closed by a contact element. The contact element is preferably arranged and configured such that it can come into contact with a pole of the electrical energy store when the electrical energy store is inserted into the energy storage housing of the holding device.

Preferably, the contact element is formed of an electrically conductive material. In particular, it may be a metal. In particular, the contact element can also close two or more energy storage housing in the manner described. According to another preferred embodiment of the invention, it may be provided that the contact element defines a contact element plane which extends transversely, in particular perpendicular to the longitudinal axis, that a solder tail is arranged or formed on the contact element, which defines a Lötfahnenebene, and that the contact element plane and Lötfahnenebene transverse, in particular perpendicular, to each other. This embodiment makes it possible, in particular, to solder the contact element to a printed circuit board which is arranged transversely to the contact element plane.

It is advantageous if the contact element closes two or more end faces of two or more energy storage housings. In particular, two or more electrical energy stores can be conductively coupled to one another, for example to connect them to one another in parallel or connected in series.

The object stated in the introduction is also achieved in an electrical energy storage device according to the invention in that the holding device is designed in the form of one of the holding devices described above. The electrical energy storage device then also has the advantages described above in connection with preferred embodiments of holding devices.

It is advantageous if the at least one electrical energy store is designed in the form of a rechargeable battery. Thus, the electric energy storage device can be used multiple times.

Conveniently, the electrical energy storage device comprises a plurality of electrical energy storage devices. On the one hand, this makes it possible to increase the capacity of the electrical energy storage device and, on the other hand, to predetermine a voltage that can be provided as a multiple of the voltage of a single energy store by appropriate interconnection of the energy store. It is advantageous if the electrical energy storage device is designed for optional coupling with a plurality of, in particular, different electrical appliances. Thus, the electric energy storage device can be used universally. To operate multiple devices, it then suffices to provide a single electrical energy storage device when the electrical devices need not all be operated simultaneously.

Advantageously, the energy storage device is designed in the form of a battery pack. Such a battery pack may in particular comprise an electrical circuit arrangement in order to monitor an overcharging and a deep discharge of the energy storage device or individual energy storage thereof. Also, for example, a temperature of individual or all energy storage can be monitored with such a circuit arrangement.

According to a further preferred embodiment of the invention it can be provided that the energy storage device comprises at least one arranged on the housing of the energy storage device second positioning, which is non-positively and / or positively engaged with the at least one first positioning in a connecting position. In this way, it is possible, in particular, to position and fix the holding device in the housing without additional fastening elements such as, for example, screws or clamps.

Furthermore, it is advantageous if the housing has at least one housing stiffening element and if the at least one second positioning element is arranged or formed on the at least one housing stiffening element. This makes the housing particularly compact.

It is advantageous if the housing has a housing trough and a housing cover and if the housing trough and the housing cover are detachably connected to one another, in particular screwed together. The The receiving space is then defined by the housing pan and the lid closing them.

Conveniently, the at least one housing stiffening element is arranged or formed on the housing trough. In particular, the at least one housing stiffening element can be arranged or designed in the form of a stiffening web. In particular, a plurality of stiffening webs may be provided on the housing.

It is advantageous if the holding device is held and positioned in the receiving space exclusively by the interconnected housing cover and housing pan. This makes it possible in particular to dispense with an additional screwing of the holding device to the housing pan or on the housing cover. This facilitates on the one hand the assembly and reduces the manufacturing cost of the energy storage device.

In order to hold the holding device in a defined manner in the receiving space, it is advantageous if the housing cover is supported on the at least one printed circuit board holding device. Such a support is particularly achievable when the housing cover and the housing pan are connected to each other and the holding device is inserted into the receiving space.

Furthermore, it may be advantageous if the electrical energy storage device comprises a plurality of holding devices. In particular, these can be arranged stacked. For stacking, the holding devices can in particular have stacking elements which engage in one another positively and / or positively in order to position the holding devices relative to one another in a defined manner.

The object stated in the introduction is also achieved according to the invention in an electrical appliance of the type described in the opening paragraph in that the at least one electrical energy storage device in the form of one of the above-described embodiments of electrical energy storage devices is trained. The electrical appliance then also has the advantages described in connection with the preferred embodiments of electrical energy storage devices.

Conveniently, the electrical energy storage device and the device housing are detachably connectable to each other. Thus, in particular, the electrical energy storage device can be separated from the electrical appliance or from the appliance housing, for example in order to connect them to a charger for charging the electrical energy storage.

Preferably, the electrical load is in the form of an electric motor. This can in particular drive cutting elements, blowers or the like, in particular to cut and shred plants. The electrical appliance can also be designed in particular in the form of a vacuum cleaner or a high-pressure cleaning appliance.

It is favorable if the electrical appliance is designed for optional coupling with a plurality of in particular different electrical energy storage devices. This configuration makes it possible, in particular, to use the electrical appliance virtually continuously, because a discharged energy storage device in the form of a battery pack can be replaced by a charged battery pack, so that it is possible to continue working with the electrical appliance.

It is advantageous if the electrical appliance is designed in the form of an electric gardening tool. In particular, it may be in the form of a sliding, mobile or portable garden implement.

Further, it is advantageous if the electric gardening device in the form of a lawnmower, a hedge trimmer, a chainsaw or a leaf blower is formed. With such gardening tools gardens can be maintained quickly and easily. The following description of preferred embodiments of the invention is used in conjunction with the drawings for further explanation. 1 shows a perspective, partially broken view of a first exemplary embodiment of an electrical energy storage device; a perspective view of the energy storage device of Figure 1 with removed housing tray; an exploded view of the energy storage device of Figure 1;

FIG. 4 shows an exploded view of a part of the one shown in FIG

Energy storage device;

FIG. 5: an exploded view of a part of that shown in FIG

Energy storage device;

FIG. 6 shows a perspective view of the arrangement from FIG. 5 in the mounted state;

Figure 7 is a view in the direction of arrow A in Figure 6; Figure 8 is a sectional view taken along line 8-8 in Figure 1;

Figure 9 is a sectional view taken along line 9-9 in Figure 8;

FIG. 10 is a view similar to FIG. 1 of a second embodiment of an electrical energy storage device; FIG. 11 is a perspective view of the arrangement from FIG. 10 with the housing tub removed;

Figure 12 is a sectional view taken along line 12-12 in Figure 10;

FIG. 13 shows a view analogous to FIG. 10 of a third exemplary embodiment of an electrical energy storage device;

FIG. 14 shows a view analogous to FIG. 11 of the energy storage device

FIG. 13;

Figure 15 is a sectional view taken along line 15-15 in Figure 13;

FIG. 16 shows a view similar to FIG. 1 of a fourth exemplary embodiment of an electrical energy storage device;

FIG. 17 shows a view analogous to FIG. 14 of the energy storage device

Figure 16; and

FIG. 18: a sectional view along line 18-18 in FIG. 16.

FIG. 1 schematically shows an electrical energy storage device 10 and an electrical appliance 12 with an electrical load 14.

The energy storage device 10 is detachably connectable to the electrical device 12. For this purpose, an energy storage device receptacle 16 can be formed on the electrical appliance, in particular.

In a connection position in which the electrical device 12 and the energy storage device 10 are connected to one another, electrical energy stored in the energy storage device 10 can be transferred to the electrical device 12 in a manner known to the person skilled in the art. The electrical appliance 12 comprises a device housing 18 in which the electrical load 14 is at least partially, in particular completely, accommodated.

The energy storage device 10 and the device housing 18 are mechanically and electrically coupled to each other and again separated from each other.

The electrical load 14 may be formed in particular in the form of an electric motor 20.

The electrical appliance 12 may also be designed in such a way that it can optionally be coupled to a plurality of energy storage devices 10. In particular, these may be electrical energy storage devices 10 of different sizes and different storage capacities. Optionally, it is also possible to simultaneously connect the electrical appliance 12 to more than one electrical energy storage device 10.

For the type of electrical appliance 12, there are basically no restrictions. In particular, it may be designed in the form of an electric garden tool, for example as a sliding, mobile or portable garden implement. Examples include lawnmowers, hedge trimmers, chainsaws or leaf blowers. This list is not exhaustive. The electrical appliance 12 may in particular also be designed in the form of a vacuum cleaner or a high-pressure cleaning appliance.

The electrical energy storage device 10 is in the form of a so-called battery pack 22, also referred to as a battery pack formed. It comprises a housing 24 which defines a receiving space 26.

In the receiving space 26 at least one electrical energy storage 28 is added. In the exemplary embodiment of the energy storage device 10 illustrated in FIGS. 1 to 9, a total of five identical energy stores 28 are arranged in the receiving space 26. The at least one electrical energy store 28 is preferably designed in the form of a rechargeable battery 30. The shape of the batteries 30 is basically arbitrary. In the figures 1 to 9 batteries 30 in the form of so-called round cells are shown schematically, which are shaped in the form of elongated cylinder, wherein a positive terminal 32 is arranged or formed on one end face of the battery 30, and a negative terminal 34 of the battery 30 at an opposite front side.

The batteries 30 are substantially rotationally symmetrical with respect to a longitudinal axis 36 defined by them.

For a defined arrangement of the batteries 30, a holding device 38, designated overall by the reference numeral 38, is provided. This is formed in two parts in the embodiment of the energy storage device 10 shown in FIGS. 1 to 9 and comprises a first holding device part 40 and a second holding device part 42.

The energy stores 28 are accommodated in the holding device 38, in each case approximately half of the first holding device part 40 and the second holding device part 42.

The two holding device parts 40 and 42 are arranged mirror-symmetrically or substantially mirror-symmetrically with respect to a plane of symmetry 44 which runs perpendicular to the longitudinal axes 36 and between the two holding device parts 40 and 42.

The first and second holding device parts 40 and 42 are also formed substantially mirror-symmetrically with respect to the plane of symmetry 44.

Optionally, it would also be conceivable to design the two holding device parts 40 and 42 identically. The housing 24 comprises a housing pan 46 and a housing cover 48. These are sealingly connected to each other. For this purpose, a sealing element 54 may be disposed between abutting end edges 50 and 52 of the housing trough 46 on the one hand and the housing cover 48 on the other hand.

The housing 24 comprises a plurality of housing stiffening elements 56. These are in the form of elongated stiffening webs 58 on a bottom 60 of the housing trough 46 in the direction of the housing cover 48 protruding out. In Figure 2, the total of four stiffening ribs 58 are clearly visible.

The housing pan 46 and the housing cover 48 are detachably connectable to each other. For this purpose, seven screw domes 62 are formed on the housing pan 46. On the housing cover 48 seven corresponding apertures 64 are provided, through each of which a threaded bolt portion of a self-tapping screw 66 is inserted. The threaded bolt portions of the self-tapping screws 66 are provided with an external thread which corresponds to the screw domes 62, and can be screwed into blind holes defined by the screw domes 62. Heads of the screws 66 abut the housing cover 48. The housing cover 48 can, as shown schematically in FIG. 1, be detachably secured to the housing trough 46 with the screws 66.

On an end face 68 of the housing trough 46, a substantially rectangular opening 70 is formed into which a transparent window element 72 is inserted in order to close the opening 70.

The structure of the holding device 38 will be explained in more detail below in particular in connection with FIGS. 4 to 6. As mentioned, the first and second retainer members 40 and 42 together form the retainer 38. Each of the two holding device parts 40, 42 comprises an energy storage housing 74 for each battery 30.

Each of the two holding device parts 40, 42 thus comprises a total of five energy storage cases 74, which define an energy storage receiving space 76 for one of the energy stores 28 or a part thereof.

The energy storage housing 74 are sleeve-shaped or substantially sleeve-shaped. They are arranged concentrically to one of the longitudinal axes 36.

Each energy storage housing 74 comprises a lateral wall 78 surrounding the longitudinal axis 36.

The jacket wall 78 comprises three jacket wall sections, namely a cylindrical first jacket wall section 80 and two second jacket wall sections 82 and 84.

The energy storage housing 74 has a length 86 parallel to the longitudinal axis 36. The first shell wall portion 80 extends over about a quarter of the length 86, the two shell wall portions 82 and 84 each over about three-eighths of the length 86th

The shell wall 78 has a thickness 88, also referred to as wall thickness, which lies in a range between about 1 mm and about 5 mm. Preferably, the thickness 88 is about 2 mm to about 3 mm.

The second mantle wall portions 82 and 84 taper slightly farther in a direction away from the first mantle wall portion 80 toward free ends 90 and 92, respectively. A cone angle 94 defined by the second jacket wall sections 82 and 84 lies in one Range between 0 ° and about 10 °, but may also be in a range between 0 ° and about 5 °.

The first casing wall section 80 has a circular inner cross section. An inner cross-sectional area defined by the first jacket wall section 80 is constant. The second casing wall sections 82, 84 taper conically starting from the first casing wall section 80 to their free ends 90, 92.

The holding device 38 can in principle be designed to receive a single energy store 28. However, it can also, as shown in the embodiment shown schematically in Figures 1 to 9, also accommodate a plurality of energy storage 28, namely, for example, five.

If a plurality of energy stores 28 are to be accommodated in the holding device 38, a number of energy storage housings 74 corresponding to the number of energy stores 28 is preferably provided, each of which forms an energy storage receiving space 76 for a single electrical energy store 28 or a part thereof.

The two second casing wall sections 80, 82 are each provided with four casing wall slots 96, 98. These each extend from the free ends 90, 92 of the second casing wall sections 82, 84 in the direction of the first casing wall section 80.

The jacket wall slots 96, 98 have a width 100, 102 which changes with respect to the longitudinal axis 36. The width 102 is slightly larger than the width 100. Alternatively, the sheath wall slots 96, 98 could also have an identical and constant width.

In principle, it would be conceivable to provide only a single jacket wall slot 96, 98 in the second jacket wall sections 82, 84. Alternatively they are instead of the four jacket wall slots 96, 98 described and illustrated, two, three, five or more jacket wall slots 96, 98 are also possible.

Due to the jacket wall slots 96, 98, four resilient jacket wall fingers 104 are formed on the second jacket wall sections 82, 84. These extend, taking into account the width 100, 102 in the circumferential direction with respect to the longitudinal axis 36 over a circumferential angle of about 60 ° to about 80 °.

The jacket wall fingers 104 have a certain flexibility and are preferably elastically resilient and / or flexible. When inserting the energy store 28 into the energy store housing 74, they can be pivoted somewhat away from the longitudinal axis 36 in the radial direction to the outside.

An outer diameter 106 of the energy store 28 is adapted to an inner diameter 108 of the first jacket wall portion 80. Due to their conical shape, which tapers off from the first jacket wall section 80, the second jacket wall sections 82 and 84 are somewhat too small in their inside position in their basic position, as shown schematically in FIG. 5, to accommodate the energy stores 28. By inserting the energy storage device 28 into the energy storage housing 74, however, the second casing wall sections 82, 84 are widened as far as necessary, so that the casing wall 78 is substantially completely and tightly in contact with an outer surface 110 of the energy storage device 28. Thus, a good heat transfer between the energy storage 28 and the energy storage housings 74 can be achieved. Insulating air cushion between the surface 110 of the energy storage 28 and an inner surface 112 of the shell walls 78 can be effectively avoided.

The jacket wall 78 of each of the energy storage housings 74 encloses at least approximately 70% of the energy storage receiving space 76. Thus, approximately 70% of the surface 110 of a radially pointing jacket is surface of the energy store 28 covered by the jacket wall 78. Ideally, coverage is even greater, preferably at least about 80%.

The second jacket wall section 84 comprises an energy storage retention element 114. This forms a stop for the energy store 28 and thus limits an insertion depth of the energy store 28 into the energy store receiving spaces 76.

The energy storage retention element 114 is in the form of an annular flange 116 pointing toward the longitudinal axis 36. This is interrupted by the jacket wall slots 98 and thus comprises a total of four Ringflanschabschnitte.

The annular flange 116 is arranged at the free end 92 of the second casing wall section 84.

The annular flanges 116 prevent the energy stores 28 with their poles 32, 34 from passing through the open free ends 92 of the second jacket wall sections 84.

On the jacket walls 78 of two mutually associated energy storage housings 74 of the two holding device parts 40, 42 a shell wall opening 118 is formed, in which a not shown in the figures temperature sensor can be used, which is then directly in contact with the surface 110 of the energy storage 28.

The jacket wall opening 118 is formed in a circular or substantially circular manner in the region of the second jacket wall sections 82 and interrupted by the jacket wall slots 96.

The respective five energy storage housings 74 of the two holding device parts 40, 42 are connected to each other via a respective stiffening element 120. The stiffening elements 120 are arranged or formed in the region of the first casing wall sections 80. Each stiffening element 120 is in the form of a stiffening rib 122. The stiffening elements 120 each define a stiffening element plane 124 which is perpendicular to the longitudinal axes 36.

At one end of the stiffening elements 120, a carrier element 126 for a display device 128 is formed in each case. The carrier elements 126 are plate-shaped with a circumferential boundary edge and define a carrier element plane 130, which runs perpendicular to the stiffening element plane 124.

The holding device 38 further comprises a printed circuit board holding device 132 for holding a printed circuit board 134. On the printed circuit board 134, in particular, a circuit arrangement 136 which is not described in more detail below can be arranged or configured for monitoring states of charge of the individual energy storage devices 28 and for monitoring and possibly limiting a charging and discharging current ,

On the circuit board 134 further electrically conductive contacts 138 are arranged, one of which forms a positive pole of the energy storage device 10, a second a negative pole and the third a charging contact.

The contacts 138 are freely accessible through contact openings 140 on the housing cover 48 and can be mechanically and electrically brought into contact with corresponding contacts on the electrical appliance 12 or a charger, not shown in the figures.

The printed circuit board holding device 132 comprises a total of four retaining projections 142 which are each formed by an energy storage housing 74 in the region of the second lateral wall portions 84 in the region of the free ends 92 in the radial direction with respect to the longitudinal axis 36 facing away. At each retaining projection 142, a retaining recess 144 in the form of a receiving groove 146 for the printed circuit board 134 is formed. Consequently, the circuit board holding device 132 comprises a total of four holding recesses 144. These define a common recess plane 148, which extends parallel to the longitudinal axes 36. All longitudinal axes 36 together define a longitudinal axis plane 150, which runs parallel to the recess plane 148.

On at least one part of the energy storage housing 74, a connecting element 152 is further formed projecting from the free end 92 of the second casing wall portion 84 parallel to the longitudinal axis 36. It is for engaging with an electrically conductive contact element 154, 156. The connection elements 152 are in the form of short pin-shaped projections.

The holding device 38 further comprises a positioning device 160 for the defined positioning of the holding device 38 in the housing 24.

The positioning device 160 comprises at least one first positioning element 162. In the exemplary embodiment of the holding device 38 illustrated in FIGS. 1 to 9, a total of eight first positioning elements are provided. They are designed in the form of positioning recesses 164 on the stiffening elements 120. They are all open towards the bottom 60 of the housing pan 46.

A width 166 of the positioning recesses 164 is slightly larger than a width 168 of the stiffening webs 58.

Second positioning elements 170, 172 are arranged on the housing stiffening elements 56, on each stiffening web 58 a second positioning element 170 and a second positioning element 172. A width 174 of the second positioning elements 172 is slightly larger than a width 176 of FIG second positioning elements 170. The widths 174 and 176 each relate to a longitudinal direction defined by the stiffening webs 58.

When the holding device 38 is inserted into the housing pan 46, the first positioning elements 162 of the first holding device part 40 engage in the second positioning elements 170, the first positioning elements 162 of the second holding device part 42 in the second positioning elements 172. The second positioning elements 170 and 172 are in shape formed by Positionierausneh- ments 178.

The positioning device 160 thus has, as described, second positioning elements 170 and 172, which are dimensioned differently. They form, in cooperation with the first positioning elements 162, a tolerance compensation device 180 for compensating manufacturing tolerances on the holding device 38 and the housing 24.

The holding device 38 is formed from the two holding device parts 40 and 42, which are each made in one piece from a plastic by injection molding.

Preferably, the holding device 38 is formed of a plastic such as polycarbonate (PC), high density polyethylene (HDPE) and / or polyamide (PA).

In order to allow a sufficient transfer of heat from the energy storage 28 to the holding device 38, preferably a plastic having a thermal conductivity at 0 ° C in a range of about 0.1 W / (m-K) to about 0.7 W / (mK ) used.

The special embodiment of the positioning device 160 makes it possible to completely dispense with screwing the holding device 38 to the housing 24. In other words, the holding device 38 in the receiving space 26 exclusively by the interconnected housing cover 48 and Housing pan 46 held and positioned. The housing cover 48 is supported in the direction of the housing cover 48 facing end surfaces 182 of the retaining projections 142, thus at the Leiterplattenhalteeinreichtung 132 from.

End-side openings 184, therefore also end faces 186, the energy storage housing 74 are closed with the contact elements 154, 156 or substantially closed.

The contact elements 154, 156 are made of an electrically conductive material, in particular of a metal. They each comprise an outer ring 188, of which in each case two flexible contact tongues 190 protrude inwardly. Openings 192 formed by two cross-shaped slots are further formed on the contact elements 154, 156, which are positioned such that they can receive the connecting elements 152 in order temporarily to fix the contact elements 154, 156 for mounting the energy storage device 10.

From each contact element 154, 156 is a solder tail 194 from. The contact elements 154, 156 define a contact element plane 196 that extends perpendicular to the longitudinal axis 36. The Lötfahnen 134 are bent by the contact elements 154, 156 by 90 ° and define a Lötfahnenebene 198, which is perpendicular to the contact element plane 196.

The contact elements 154 and 156 differ in such a way that the contact element 154 closes only a single end face 186 of an energy storage housing 74, whereas the contact elements 156 in each case two end faces 186 of two energy storage housings 74.

FIGS. 10 to 12 schematically show a second exemplary embodiment of an energy storage device, generally designated by the reference numeral 10. It is in its basic structure with the schematically illustrated in Figures 1 to 9 first embodiment of the energy storage device 10 substantially. Therefore, were to Designation of identical or similar components and elements identical reference numerals used.

An essential difference from the first embodiment, however, is that not five energy storage, but ten energy storage 28 are housed in the housing 24. This is dimensioned correspondingly larger. This is achieved by a correspondingly larger housing shell 46. The housing cover 48 is virtually unchanged.

Furthermore, there are also differences in the holding device 38. Although this is in turn formed of two holding device parts 40 and 42, which are made separately from each other by injection molding. However, each of the two holding device parts 40, 42 has not five but ten energy storage housings 74, which are shaped in the manner described in connection with the exemplary embodiment of the energy storage device 10 illustrated in FIGS. 1 to 9. The ten energy storage housings 74 are arranged in two rows of five energy storage housings 74 each.

Further differences arise in particular in the shape of the contact elements 154 and 156. These are arranged and designed so that the same total voltage can be tapped at the contacts 138 as in the energy storage device 10, which is shown in Figures 1 to 9. Thus, therefore, the energy storage 28 are partially connected in parallel. Due to the double number of energy stores 28, the energy storage device of FIGS. 10 to 12 has twice the charge capacity at the same nominal voltage of the energy storage device 10.

A third exemplary embodiment of an energy storage device is shown schematically in FIGS. 13 to 15 and also designated by the reference numeral 10.

It is true in its basic structure with the second embodiment of the energy storage device 10, which in the figures 10 to 12 schema table is shown. In particular, the third exemplary embodiment also includes ten energy stores 28.

However, the ten energy storage 28 are not partially parallel, but all connected in series. Consequently, the individual cell voltages of all ten energy stores thus add up to a total voltage of the energy storage device 10 which is twice as high as in the energy storage devices 10 of FIGS. 1 to 9 on the one hand and 10 to 12 on the other hand.

In order to achieve this, in particular the contact elements 154 and 156 are slightly differently shaped and arranged than in the embodiment of Figures 10 to 12. In particular, the openings 192 and the connecting elements 152 are positioned slightly differently to a confusion of the holders 38 for the second and to avoid third embodiment during assembly.

FIGS. 16 to 18 show a fourth exemplary embodiment of an energy storage device, designated overall by the reference numeral 10. It comprises a total of twenty energy stores 28. The twenty energy storage housings 74 are arranged in four rows arranged one above the other to five energy storage housings 74 each.

The contact elements 154 and 156 and the arrangement of the energy storage 28 is chosen so that the energy storage 28 are connected in parallel and half in parallel in series. This results in the same total voltage for the energy storage device 10 as in the third embodiment shown in Figures 13-15. The total voltage thus corresponds to the total voltage of ten energy storage devices 28 connected in series.

In the embodiment of the energy storage device 10 shown in FIGS. 16 to 18, the contact elements 154 and 156 are shown in FIG. designed speaking to achieve the desired interconnection of the energy storage 28.

Also on the holding device 38 with the two holding device parts 40 and 42 corresponding modifications for receiving and positioning the contact elements 154, 156 are made.

The housing tray 46 is formed correspondingly larger.

In all four described embodiments of energy storage devices 10, in particular identical energy stores 28 can be accommodated in the holding devices 38. The arrangement of the printed circuit boards 134 on the holding devices 38 is also described in the exemplary embodiments two, three and four as described in connection with the embodiment of the energy storage device 10 shown in FIGS. 1 to 9.

Also, the positioning of the unit comprising the holding device 38 in conjunction with the recorded energy storage 28 and the circuit board 134 in the housing 24 without further fasteners, so only by the design of the positioning device 160 corresponds in the embodiments two, three and four the same principle as in Explained connection with the first embodiment.

The energy storage devices 10 described above can basically be used for any type of energy storage device 28. Preferably, the energy stores 28 are lithium-ion batteries that are rechargeable. Energy storage device

electrical appliance

consumer

Energy storage device housing device housing

electric motor

battery Pack

casing

accommodation space

energy storage

battery

positive pole

minuspol

longitudinal axis

holder

first holding device part second holding device part

plane of symmetry

housing trough

housing cover

front edge

sealing element

Housing stiffener

reinforcing web

ground

screw boss

perforation

screw

front

perforation 72 window element

74 energy storage housing

76 energy storage storage room

78 shell wall

80 first jacket wall section

82 second jacket wall section

84 second jacket wall section

86 length

88 thickness

90 free end

92 free end

94 cone angle

96 sheath wall slots

98 sheath wall slots

100 width

102 width

104 jacket wall fingers

106 outer diameter

108 inner diameter

110 surface

112 inner surface

114 energy storage retention element

116 ring flange

118 shell wall opening

120 stiffening element

122 stiffening rib

124 stiffening element level

126 carrier element

128 display device

130 carrier element level

132 PCB holding device

134 circuit board

136 circuit arrangement 138 contacts

140 contact opening

142 retaining projection

144 holding recess

146 receiving groove

148 recess levels

150 longitudinal axis planes

152 connecting element

154 contact element

156 contact element

158 ahead

160 positioning device

162 first positioning element

164 positioning recess

166 width

168 width

170 second positioning element

172 second positioning element

174 width

176 width

178 positioning recess

180 tolerance compensation device

182 endface

184 opening

186 front side

188 ring

190 contact tongue

192 opening

194 soldering lug

196 contact element levels

198 solder flag levels

Claims

claims

Holding device (38) for at least one electrical energy store (28), in particular in the form of a battery (30), comprising at least one energy storage housing (74) for the at least one electrical energy store (28), which at least one energy storage housing (74) an energy storage receiving space (76 ) for the at least one electrical energy store (28), wherein the at least one energy storage housing (74) is sleeve-shaped or essentially sleeve-shaped, defines a longitudinal axis (36) and comprises a lateral wall (78) surrounding the longitudinal axis (36) at least in sections; characterized in that the mantle wall (78) comprises a first mantle wall section (80) and at least one adjoining second mantle wall section (82, 84) and that the first mantle wall section (80) defines a constant inner cross-sectional area and that the second mantle wall section (80) 82, 84) in a direction from the ers th sheath wall portion (80) pointing away tapers.

Holding device according to claim 1, characterized in that the first casing wall portion (80) defines a circular or polygonal inner cross-section.

Holding device according to one of the preceding claims, characterized in that the at least one second casing wall portion (82, 84) tapers conically.

Holding device according to one of the preceding claims, characterized in that the holding device (38) is designed for receiving a plurality of electrical energy storage (28), in particular for two, three, four, five, ten or twenty energy storage (28).

5. Holding device according to one of the preceding claims, characterized by a plurality of energy storage housings (74), each defining an energy storage receiving space (76) for a single electrical energy store (28).

6. Holding device according to one of the preceding claims, characterized in that the holding device (38) is formed in one piece or in two parts.

7. Holding device according to claim 6, characterized in that the two-part holding device (38) comprises a first and a second holding device part (40, 42).

8. Holding device according to claim 7, characterized in that the first and the second holding device part (40, 42) are arranged relative to each other mirror-symmetrically or substantially mirror-symmetrically and / or formed.

9. Holding device according to claim 7 or 8, characterized in that the first and the second holding device part (40, 42) are identical or substantially identical.

10. Holding device according to one of the preceding claims, characterized in that the at least one second casing wall portion (80, 82) at least one parallel or substantially parallel to the longitudinal axis (36) extending casing wall slot (96, 98), which starting from a free end (90, 92) of the second casing wall portion (82, 84) in the direction of the first

Casing wall portion (80) extends towards.

11. Holding device according to claim 10, characterized in that the at least one jacket wall slot (96, 98) in the circumferential direction on the longitudinal axis (36) has a constant or varying width (100, 102).

12. Holding device according to claim 10 or 11, characterized in that the at least one second casing wall section (82, 84) has two, three, four, five or more casing wall slots (96, 98).

13. Holding device according to claim 12, characterized in that at least two jacket wall slots (96, 98) in the circumferential direction relative to the longitudinal axis (36) have a different width (100, 102).

14. Holding device according to one of the preceding claims, characterized in that the at least one second casing wall portion (82, 84) is resiliently and / or flexibly formed.

15. Holding device according to one of the preceding claims, characterized in that the jacket wall (78) has two second casing wall sections (82, 84) which adjoin the first casing wall section (80) on both sides.

16. Holding device according to one of the preceding claims, characterized in that the at least one second casing wall portion (82) comprises at least one energy storage retention element (114) which limits an insertion depth of the energy storage device (28) in the energy storage receiving space (76).

17. Holding device according to claim 16, characterized in that the at least one energy storage retention element (114) in the form of a in the direction of the longitudinal axis (36) facing annular flange (116) and formed at the free end (92) of the at least one second casing wall portion (82 ) is arranged.

18. Holding device according to one of the preceding claims, characterized in that the jacket wall (78) encloses at least 70%, preferably at least 80%, of the energy storage receiving space (76).

19. Holding device according to one of the preceding claims, characterized in that one of the first casing wall portion (80) defined inner diameter (106) is adapted to an outer diameter (108) of the energy store (28) or this corresponds or substantially corresponds.

20. Holding device according to one of the preceding claims, characterized in that the jacket wall (78) has at least one jacket wall opening (118) for a temperature sensor.

21. Holding device according to claim 20, characterized in that the jacket wall opening (118) is circular or substantially circular.

22. Holding device according to one of the preceding claims, characterized by a Leiterpiattenhaiteeinrichtung (132) for holding a printed circuit board (134).

23. Holding device according to claim 22, characterized in that the Leiterpiattenhaiteeinrichtung (132) has at least one holding recess (144) for a printed circuit board (134).

24. Holding device according to claim 23, characterized by two, three, four or more retaining recesses (144).

25. Holding device according to claim 22 or 23, characterized in that the at least one retaining recess (144) in the form of a receiving groove (146) is formed.

26. Holding device according to one of claims 22 to 25, characterized in that the at least one retaining recess (144) on one of the jacket wall (78), in particular of the at least one second jacket wall portion (84), in the radial direction relative to the

Longitudinal axis (36) projecting retaining projection (142) is formed.

27. Holding device according to one of claims 22 to 26, characterized in that the at least one retaining recess (144) defines a recess plane (148) which extends parallel to the longitudinal axis (36).

28. Holding device according to one of the preceding claims, characterized in that the at least one energy storage housing (74) has at least one connecting element (152) for engaging with an electrically conductive contact element (154, 156), wherein in particular the at least one connecting element (152 ) is formed projecting from a free end (92) of the second jacket section (84) parallel to the longitudinal axis (36).

29. Holding device according to one of the preceding claims, characterized in that the holding device (38) is made in one piece or in two pieces from a plastic by injection molding.

30. Holding device according to claim 29, characterized in that the plastic is polycarbonate (PC), high-density polyethylene (HDPE), acrylonitrile-butadiene-styrene copolymer (ABS), polycarboxylate with acrylonitrile-butadiene-styrene copolymer and / or polyamide (PA) is or contains.

31. Holding device according to claim 29 or 30, characterized in that the plastic has a thermal conductivity at 0 ° C in a range of about 0.1 W / (m-K) to about 0.7 W / (m-K).

32. Holding device according to one of the preceding claims, characterized in that the jacket wall (78) has a thickness (88) in a range of about 1 mm to about 5 mm, in particular in a range of about 2 mm to about 3 mm.

33. Holding device according to one of the preceding claims, characterized in that at least one energy storage housing (74) at least one stiffening element (120) is arranged or formed.

34. Holding device according to claim 33, characterized in that the at least one stiffening element (120) in the form of a stiffening rib (122) is formed.

35. Holding device according to claim 33 or 34, characterized in that the at least one stiffening element (120) on the first casing wall portion (80) is formed.

36. Holding device according to one of claims 33 to 35, characterized in that the at least one stiffening element (120) connects the first casing wall sections (80) of a plurality of energy storage housings (74) with each other.

37. Holding device according to one of the preceding claims, characterized by at least one carrier element (126) for a display device (128).

38. Holding device according to claim 37, characterized in that the at least one carrier element (126) is arranged or formed on the at least one stiffening element (120).

39. Holding device according to claim 37 or 38, characterized in that the at least one carrier element (126) defines a carrier element plane (130) which extends transversely, in particular perpendicularly, to the recess plane (148).

40. Holding device according to one of the preceding claims, characterized by a positioning device (160) for positioning the holding device (38) in a housing of an electrical energy storage device (10).

41. The holding device according to claim 40, characterized in that the positioning device (160) comprises at least one first positioning element (162) which is connected to at least one second positioning element (170, 172) arranged on the housing (24) of the energy storage device (10). and / or positively engageable.

42. Holding device according to claim 41, characterized in that the at least one first positioning element (162) is designed in the form of a positioning projection or a positioning recess (164).

43. Holding device according to claim 41 or 42, characterized in that the at least one first positioning element (162) is arranged or formed on the at least one stiffening element (120).

44. Holding device according to one of claims 41 to 43, characterized in that the positioning device (160) comprises a plurality of positioning elements (170, 172) and that at least two of the plurality of positioning elements (170, 172) are formed differently dimensioned to form a tolerance compensation device (180 ).

45. Holding device according to one of the preceding claims, characterized in that at least one end face (186) of the at least an energy storage housing (74) with a contact element (154, 156) is closed or substantially closed.

46. Holding device according to claim 45, characterized in that the contact element (154, 156) made of an electrically conductive material, in particular a metal, is formed.

47. Holding device according to claim 45 or 46, characterized in that the contact element (154, 156) defines a contact element plane (196) which extends transversely, in particular perpendicular to the longitudinal axis (36), that arranged on the contact element Lötfahne (194) or is formed, which defines a Lötfahnenebene (198), and that the contact element plane (196) and the Lötfahnenebene (198) transversely, in particular perpendicular, to each other.

48. Holding device according to one of claims 45 to 47, characterized in that the contact element (156) closes two or more end faces (186) of two or more energy storage housings (74).

49. An electrical energy storage device (10), in particular in the form of a battery pack (22), for an electrical appliance (12), which electrical energy storage device (10) comprises a housing (24), which housing (24) defines a receiving space (26) which at least one electrical energy store (28) is accommodated, wherein the at least one electrical energy store (28) is held in a holding device (38) for at least one electrical energy store (28), characterized in that the holding device (38) in the form of a holding device (38) is designed according to one of the preceding claims.

50. An electrical energy storage device according to claim 49, characterized in that the at least one electrical energy store (28) in the form of a rechargeable battery (30) is formed.

51. Electrical energy storage device according to claim 49 or 50, characterized by a plurality of electrical energy storage devices (28).

52. Electrical energy storage device according to one of claims 49 to

51, characterized in that the electrical energy storage device (10) is designed for optional coupling with a plurality of in particular different electrical appliances (12).

53. Electrical energy storage device according to one of claims 49 to

52, characterized in that the energy storage device (10) in the form of a battery pack (22) is formed.

54. Electrical energy storage device according to one of claims 49 to

53, characterized by at least one on the housing (24) of the energy storage device (10) arranged second positioning element (170, 172), which is non-positively and / or positively engaged with the at least one first positioning member (162) in a connection position.

55. The electrical energy storage device according to claim 54, characterized in that the housing (24) has at least one housing stiffening element (56) and that the at least one second positioning element is arranged or formed on the at least one housing stiffening element (56).

56. Electrical energy storage device according to one of claims 49 to 55, characterized in that the housing (24) has a housing trough (46) and a housing cover (48) and that the housing trough (46) and the housing cover (48) are detachably connected to each other , in particular screwed together.

57. Electrical energy storage device according to claim 56, characterized in that the at least one housing stiffening element (56) is arranged or formed on the housing trough (46), in particular in the form of a stiffening web (58).

58. The electrical energy storage device according to 56 or 57, characterized in that the holding device (38) in the receiving space (26) exclusively by the interconnected housing cover (48) and housing pan (46) is held and positioned.

59. Electrical energy storage device according to one of claims 56 to

58, characterized in that the housing cover (48) on the at least one printed circuit board holding device (132) is supported.

60. The electrical energy storage device according to one of claims 49 to

59, characterized by a plurality of, in particular stacked holding devices (38).

61. Electrical appliance (12) with at least one electrical load (14) which is accommodated at least partially, in particular completely, in a device housing (18) and at least one electrical energy storage device (10), characterized in that the at least one electrical energy storage device ( 10) in the form of an electrical energy storage device (10) according to one of claims 49 to 60 is formed.

62. Electrical device according to claim 61, characterized in that the electrical energy storage device (10) and the device housing (18) are detachably connectable to each other.

63. Electrical device according to claim 61 or 62, characterized in that the electrical load (14) in the form of an electric motor (20) is formed.

64. Electrical appliance according to one of claims 61 to 63, characterized in that the electrical appliance (12) is designed for optional coupling with a plurality of in particular different electrical energy storage devices (10).

65. Electrical appliance according to one of claims 61 to 64, characterized in that the electrical appliance (12) is designed in the form of an electric gardening device, in particular in the form of a sliding, mobile or portable gardening tool, or in the form of a high-pressure cleaning device or a vacuum cleaner.

66. Electrical device according to claim 65, characterized in that the electrical gardening device in the form of a lawnmower, a hedge trimmer, a chainsaw or a leaf blower is formed.