Hand-held power tool comprising a battery pack state display unit

Abstract

In a hand-held machine tool having a first battery pack and at least one second battery pack, and having a battery pack state display unit (150) which has a single battery pack charge state display (222), the battery pack state display unit (150) furthermore has a first display element (224) allocated to the first battery pack and at least one second display element (225) allocated to the at least one second battery pack, wherein the battery pack charge state display (222) is operatively connected to the first and to the at least one second display element (224, 225) in such a manner that at least three different availability states of the battery packs (192, 194) can be indicated thereby. (Figure 2)

Description

[0001] Description

[0002] title

[0003] Hand tool with a battery pack status display unit

[0004] State of the art

[0005] The present invention relates to a hand-held power tool with at least a first battery pack and a second battery pack, as well as with a battery pack status display unit which has at least one battery pack charge status display.

[0006] A handheld power tool designed as a hammer drill with at least a first battery pack and a second battery pack is known from the prior art. The hammer drill is equipped with a battery pack status indicator unit that has a battery pack charge level indicator for displaying the respective battery pack charge levels of the first and second battery packs.

[0007] Disclosure of the invention

[0008] The invention relates to a handheld power tool with a first battery pack and at least one second battery pack, and with a battery pack status display unit which has a single battery pack charge status display. The battery pack status display unit further has a first display element assigned to the first battery pack and at least one second display element assigned to the at least one second battery pack. The battery pack charge status display is operatively connected to the first and the at least one second display element in such a way that at least three different availability states of the battery packs can be displayed via them. The invention thus enables the provision of a handheld power tool with a first and at least one second battery pack, in which a precise and reliable determination of a respective operational readiness or availability state can be made by monitoring at least three different availability states of the battery packs.The hand tool can be made ready for use.

[0009] A handheld power tool is understood to be a hand-held machine tool for machining workpieces using an electrically powered tool. Typical handheld power tools in this context include drills, hammer drills, screwdrivers, impact wrenches, planers, angle grinders, orbital sanders, polishers, and the like. However, garden and construction equipment such as lawn mowers, grass trimmers, pruning saws, power cutters and trenchers, blowers, demolition hammers, and the like also qualify as handheld power tools. Furthermore, the invention is applicable to handheld household appliances such as vacuum cleaners, blenders, etc.

[0010] The availability states are preferably assigned to different forms of representation such that, in conjunction with the battery pack charge level indicator, the first display element visualizes in a first form of representation an unrestricted availability of the first battery pack at full power, in a second form of representation a restricted availability of the first battery pack at reduced power, and in a third form of representation a non-availability of the first battery pack, and the at least one second display element visualizes in a fourth form of representation an unrestricted availability of the at least one second battery pack at full power, in a fifth form of representation a restricted availability of the at least one second battery pack at reduced power, and in a sixth form of representation a non-availability of the at least one second battery pack.

[0011] By determining the current availability of each battery pack, improved monitoring of the respective operational readiness or readiness for use of the handheld power tool can be enabled. In particular, this allows the available power of the first and second battery packs of the handheld power tool to be easily and reliably determined and visualized.

[0012] Preferably, the display elements and the battery pack charge level indicator automatically represent the availability status of the battery pack with the weakest availability.

[0013] This enables an adequate representation of the minimum operational readiness or readiness for use of the hand-held power tool.

[0014] Preferably, the battery pack status display unit has an overall status display which, in a seventh display form, visualizes unrestricted joint availability of the battery packs at full power, in an eighth display form, a restricted joint availability of the battery packs at reduced power, and in a ninth display form, a non-availability of the first or the second battery pack.

[0015] This makes it easy to monitor and visualize the current operational readiness or readiness for use of the handheld power tool as a whole. This allows the available performance during operation of the handheld power tool to be reliably determined and visualized.

[0016] The forms of representation for the availability states of the first battery pack, the forms of representation for the availability states of the at least one second battery pack and the forms of representation for the common availability states are preferably assigned to different lighting effects and / or colors.

[0017] This allows for clear and understandable display formats for the handheld power tool user. Different color representations can be specified by assigning different colors to the display formats. For example, one display format can be assigned the color "green," another the color "orange," and yet another the color "red." Different lighting effects can be specified, for example, as different brightnesses, different flashing frequencies, different on / off sequences, different line thicknesses of a lit area, etc.

[0018] According to one embodiment, a measuring unit is provided which determines measured values ​​associated with the first battery pack and / or the at least one second battery pack in order to determine the respective availability state.

[0019] By determining assigned measured values ​​for the first and / or second battery pack, the respective charge level of the first and / or second battery pack can be determined precisely and correctly at any time.

[0020] Preferably, the measuring unit has at least one voltmeter, wherein the measured values ​​determined comprise battery pack voltages.

[0021] This means that the measured values ​​can be determined in a reliable and uncomplicated manner.

[0022] Preferably, a control device is provided which, depending on the measured values ​​determined, controls the battery pack charge level indicator and the first display element in each case for visualizing the display form for the availability state of the first battery pack and / or the battery pack charge level indicator and the second display element in each case for visualizing the display form for the availability state of the at least one second battery pack.

[0023] This makes it possible to easily and efficiently control the first and / or second display element depending on the measured values ​​determined.

[0024] Preferably, the control device has a lookup table in which the display formats are assigned to different measurement ranges of the determined measured values. This enables a suitable assignment of different measurement ranges to the different display formats.

[0025] Preferably, the control device compares a first instantaneous battery pack voltage determined by the measuring unit for the first battery pack with a second instantaneous battery pack voltage determined by the measuring unit for the at least one second battery pack to determine a respective smaller battery pack voltage and controls the battery pack charge level indicator to display a battery pack charge level associated with the respective smaller battery pack voltage.

[0026] By displaying the battery pack charge level associated with the respective lower battery pack voltage, it can be ensured that a user of the hand-held power tool is shown the minimum current operational readiness or readiness for use of the hand-held power tool.

[0027] Preferably, the battery pack charge level indicator is assigned a selection element with which the battery pack charge level indicator can be assigned selectively to the first battery pack or to the at least one second battery pack.

[0028] In this way, various operating parameters of the hand-held power tool can be made available to the user for an application-specific adjustment of the machine configuration in order to maintain the required operational readiness or readiness for use of the hand-held power tool.

[0029] Preferably, the selection element can be assigned to the battery packs together.

[0030] This allows for a simple and straightforward selection element to be provided.

[0031] Brief description of the drawings The invention is explained in more detail in the following description with reference to exemplary embodiments shown in the drawings. They show:

[0032] Fig. 1 is a perspective view of a hand-held power tool with a first and second battery pack, as well as with a battery pack status display unit,

[0033] Fig. 2 is a plan view of the battery pack status display unit of Fig. 1, in a first exemplary application,

[0034] Fig. 3 is a plan view of the battery pack status display unit of Fig. 1, in a second exemplary application, and

[0035] Fig. 4 is a plan view of the battery pack status display unit of Fig. 1, in a third exemplary application,

[0036] Fig. 5 is a plan view of the battery pack status display unit of Fig. 1, in a fourth exemplary application,

[0037] Fig. 6 is a plan view of the battery pack status display unit of Fig. 1, in a fifth exemplary application, and

[0038] Fig. 7 is a plan view of the battery pack status indicator unit of Fig. 1, in a sixth exemplary application.

[0039] Description of the embodiments

[0040] In the figures, elements with the same or comparable function are provided with identical reference symbols and are described in detail only once.

[0041] Fig. 1 shows an exemplary handheld power tool 100 with a first battery pack 192 and at least one second battery pack 194, as well as with a battery pack status display unit 150. The battery packs 192, 194 are illustratively attached to a battery pack interface 180 of the handheld power tool 100. The battery pack interface 180 is arranged, for example, on a housing 110 of the handheld power tool 100 and forms an electromechanical receptacle and guide for the battery packs 192, 194.

[0042] The battery pack status display unit 150 is preferably designed to indicate to a user of the handheld power tool 100 the respective availability of the battery pack 192 and / or the battery pack 194, in order to thus visualize the current operational readiness or readiness for use of the handheld power tool 100. For this purpose, the handheld power tool 100 preferably has at least one control device 160 and a measuring unit 170. The control device 160 and the measuring unit 170 are preferably arranged in the housing 110 and are at least functionally assigned to the battery pack status display unit 150.

[0043] A drive unit 120 for driving a tool holder 140 of the handheld power tool 100 is preferably arranged in the housing 110. The tool holder 140 is designed, for example, to accommodate an insert tool and rotates about an associated axis of rotation during a corresponding work process.

[0044] The housing 110 forms, for example, a handle 115. Furthermore, an optional additional handle 117 is arranged on the housing 110 in the area of ​​the tool holder 140.

[0045] In Fig. 1, the handheld power tool 100 is embodied, by way of example, as a hammer drill. However, the present invention is not limited to a hammer drill, but can be applied to a variety of different handheld power tools that have at least a first battery pack and a second battery pack, as well as a battery pack status display unit.

[0046] In general, a handheld power tool is understood to be a hand-held machine tool for machining workpieces using an electrically powered tool. Typical handheld power tools in this context include drills, hammer drills, screwdrivers, impact wrenches, planers, angle grinders, orbital sanders, polishers, and the like. However, garden and construction equipment such as lawn mowers, grass trimmers, pruning saws, power cutters and trenchers, blowers, demolition hammers, and the like also qualify as handheld power tools. Furthermore, the invention is applicable to handheld household appliances such as vacuum cleaners, blenders, etc.

[0047] Fig. 2 shows the battery pack status display unit 150 of the handheld power tool 100 of Fig. 1, which according to the invention has a single battery pack charge status display 222, as well as a first display element 224 assigned to the battery pack 192 of Fig. 1 and at least one second display element 225 assigned to the at least one battery pack 194 of Fig. 1. In Fig. 1, the battery pack status display unit 150 illustrates, by way of example, an unrestricted availability 200 of the handheld power tool 100 at full power of the battery packs 192, 194 of Fig. 1. In addition, the battery pack status display unit 150 can have one or more other status displays 232, 234, 236, wherein, for example, the status display 232 can display a temperature status of the battery packs 192, 194 of Fig. 1, the status display 234 illustratively displays a warning with regard to a possible Kickback and the status indicator 236 can display a warning in case of overload of the drive unit 120 of Fig. 1.

[0048] The battery pack charge level indicator 222 is, by way of example, a conventional charge level indicator that visualizes an assigned charge level via a plurality of charge bars 299, illustratively five charge bars. Preferably, the battery pack charge level indicator 222 is assigned a selection element 244, with which the battery pack charge level indicator 222 can be assigned selectively to the battery pack 192 of Fig. 1, the battery pack 194 of Fig. 1, or both battery packs 192, 194 of Fig. 1 together.

[0049] The battery pack charge level indicator 222 is operatively connected to the first and the at least one second display element 224, 225 in such a way that at least three different availability states of the battery packs 192, 194 can be displayed via them. For this purpose, at least three different display formats are assigned to the display elements 224, 225 or the different availability states. In this case, the display element 224, in conjunction with the battery pack charge level indicator 222, visualizes in a display format 228 an unrestricted availability of the battery pack 192 of Fig. 1 at full power, and the display element 225, in conjunction with the battery pack charge level indicator 222, visualizes in a display format 229 an unrestricted availability of the battery pack 194 of Fig. 1 at full power.

[0050] In addition, the display element 224 is designed, in conjunction with the battery pack charge level indicator 222, to visualize a limited availability of the battery pack 192 of Fig. 1 at reduced power in a first, further representation form (329 in Fig. 3), and to visualize a non-availability of the battery pack 192 of Fig. 1 in a second, further representation form (429 in Fig. 4). Analogously, the display element 225 is designed, in conjunction with the battery pack charge level indicator 222, to visualize a limited availability of the battery pack 194 of Fig. 1 at reduced power in a first, further representation form (529 in Fig. 5), and to visualize a non-availability of the battery pack 194 of Fig. 1 in a second, further representation form (629 in Fig. 6).Preferably, the display elements 224, 225 and the battery pack charge level indicator 222 automatically display the availability state of the battery pack 192, 194 with the weakest availability.

[0051] The different display forms of the display elements 224, 225 can be assigned to different lighting effects. For example, suitable different lighting effects for the first and / or second display element can be specified as different illumination brightnesses, different flashing frequencies, different on / off sequences, different line thicknesses of a lit-up pictogram, etc. Thus, clear display forms that are easily understandable for a user of the handheld power tool 100 of Fig. 1 can be provided. The display elements 224, 225 illustrate the unrestricted availability of the battery packs 192, 194 of Fig. 1 at full power in the display forms 228, 229 by brightly lit pictograms, optionally or alternatively with solid lines.

[0052] Alternatively or optionally, the different forms of representation of the

[0053] Display elements 224, 225 can be assigned different color representations. Different color representations can be specified, for example, by assigning different colors. For example, display elements 224, 225 could visualize the unrestricted availability of battery packs 192, 194 of Fig. 1 at full power in display forms 228, 229 using green illuminated pictograms.

[0054] In addition to the display elements 224, 225, the battery pack status display unit 150 preferably comprises an overall status display 210. The overall status display 210, for example, visualizes in a display form 212 an unrestricted joint availability of the battery packs 192, 194 of Fig. 1 at full power. Furthermore, the overall status display 210 is preferably configured to visualize in a first, further display form (312 in Fig. 3) a restricted joint availability of the battery packs 192, 194 of Fig. 1 at reduced power, and to visualize in a second, further display form (412 in Fig. 4) a joint unavailability of the battery packs 192, 194 of Fig. 1.

[0055] The different forms of representation of the overall status display 210 are preferably assigned to different color representations.

[0056] This again makes it possible to provide clear and easily understandable representations for a user of the handheld power tool 100 of Fig. 1. Suitable different color representations can be specified, for example, by assigning different colors to the representations. For example, the color "green" can be assigned to the representation 212. The overall status display 210 illustrates the unrestricted joint availability of the battery packs 192, 194 of Fig. 1 at full power in the representation 212 by means of diagonal hatching, which here symbolizes the color "green" as an example.

[0057] Alternatively or optionally, the different display formats can be assigned to different lighting effects. Different lighting effects for the overall status display 210 can be specified, for example, as different brightnesses of illumination, different flashing frequencies, different on and off sequences, different line thicknesses of a lit area, etc. The display formats currently to be used for the overall status display 210 and the display elements 224, 225 are preferably determined on the basis of measured values ​​that can be determined by means of the measuring unit 170 of Fig. 1. In this case, the measuring unit 170 of Fig. 1 preferably determines measured values ​​assigned to the battery pack 192 of Fig. 1 and / or the battery pack 194 of Fig. 1 in order to determine a respective current battery pack availability. In an exemplary embodiment, the measuring unit 170 of Fig.1 at least one voltmeter, whereby the measured values ​​are battery pack voltages.

[0058] Preferably, the overall status display 210 and the display elements 224, 225 are each controlled depending on the determined measured values ​​to visualize the currently used display formats. Control is preferably carried out by means of the control device 160 of Fig. 1. In this case, the control device 160 of Fig. 1 can, for example, have a lookup table in which all different display formats are assigned to different measured value ranges of the determined measured values.

[0059] In a preferred embodiment, the control device 160 of Fig. 1 compares a first instantaneous battery pack voltage determined by the measuring unit 170 of Fig. 1 for the battery pack 192 of Fig. 1 with a second instantaneous battery pack voltage determined by the measuring unit 170 of Fig. 1 for the battery pack 194 of Fig. 1 to determine a lower battery pack voltage, whereupon the battery pack charge level indicator 222 is controlled by the control device 160 to display a battery pack charge level associated with the lower battery pack voltage. The battery pack charge level indicator 222 can thus visualize the charge level of the battery pack that has a lower availability, or the lower charge level. However, if the battery pack charge level indicator 222 is assigned to the battery pack with the higher availability, i.e. the higher charge level, via the selection element 244, the following can be done, for example, as shown in Fig.2 illustrates how the charge level of the battery pack with the lower availability or the smaller charge level can be additionally displayed via a further display element 242. Fig. 3 shows the battery pack status display unit 150 of Fig. 2 with the battery pack charge level display 222, the display elements 224, 225, and the overall status display 210, but in contrast to Fig. 2 to illustrate a limited availability 300 of the handheld power tool 100 of Fig. 1 with reduced power of the battery packs 192, 194 of Fig. 1. In this case, the display element 224, in a representation form 329, visualizes, by way of example, the limited availability of the battery pack 192 of Fig. 1 with reduced power by means of the pictogram that is less brightly illuminated compared to Fig. 2, optionally or alternatively with dashed lines. In addition, the battery pack charge level indicator 222 exemplifies the low charge level of the battery pack 192 of Fig. 1.Furthermore, the overall status display 210 visualizes in an exemplary representation 312 a limited joint availability of the battery packs 192, 194 of Fig. 1 at reduced power, wherein the representation 312 is illustrated by a vertical hatching, which here symbolizes the color “orange” as an example.

[0060] Fig. 4 shows the battery pack status display unit 150 of Fig. 3 with the battery pack charge status display 222, the display elements 224, 225, and the overall status display 210, but in contrast to Fig. 3 to illustrate a non-availability 400 of the hand-held power tool 100 of Fig. 1. In this case, the display element 224 visualizes in a representation form 429, for example, the non-availability of the battery pack 192 of Fig. 1 by means of the pictogram which is even less brightly illuminated compared to Fig. 3, optionally or alternatively with dotted lines. In addition, the battery pack charge level indicator 222 visualizes, by way of example, the low or empty charge level of the battery pack 192 of Fig. 1. Furthermore, the overall status indicator 210 visualizes, in an exemplary representation form 412, a non-availability of the battery packs 192, 194 of Fig. 1, wherein the representation form 412 is illustrated by a dotted line, which here symbolizes the color "red" by way of example.

[0061] Fig. 5 shows the battery pack status display unit 150 of Fig. 3 with the battery pack charge status display 222, the display elements 224, 225, and the overall status display 210 to illustrate a restricted availability 300 of the handheld power tool 100 of Fig. 1 with reduced power of the battery packs 192, 194 of Fig. 1. In contrast to Fig. 3, both display elements 224, 225 now visualize, by way of example, the restricted availability of the battery packs 192, 194 of Fig. 1 with reduced power in the display form 329 for the battery pack 192 of Fig. 1, as well as a display form 529 for the battery pack 194 of Fig. 1, which corresponds, by way of example, to the display form 329. In addition, the battery pack charge level indicator 222 visualizes, by way of example, the low charge level of both battery packs 192, 194 of Fig. 1. Furthermore, the overall status indicator 210 in the representation form 312 of Fig. 3 visualizes the limited joint availability of the battery packs 192, 194 of Fig.1 at reduced power.

[0062] Fig. 6 shows the battery pack status display unit 150 of Fig. 4 with the battery pack charge status display 222, the display elements 224, 225, and the overall status display 210 to illustrate a non-availability 400 of the hand-held power tool 100 of Fig. 1. In contrast to Fig. 4, the display element 224 visualizes in the display form 329 of Fig. 3, by way of example, the limited availability of the battery pack 192 of Fig. 1 at reduced power, while the display element 225 now visualizes in a display form 629, by way of example, the non-availability of the battery pack 194 of Fig. 1, which illustratively corresponds to the display form 429 of Fig. 4. In addition, the battery pack charge level indicator 222 visualizes, by way of example, the low or empty charge level of the battery pack 192 of Fig. 1. Furthermore, the overall status indicator 210 in the representation form 412 of Fig. 4 visualizes the unavailability of the battery packs 192, 194 of Fig. 1.

[0063] Fig. 7 shows the battery pack status display unit 150 of Fig. 2 with the battery pack charge status display 222, the display elements 224, 225, and the overall status display 210, in contrast to Fig. 2 to illustrate the restricted availability 300 of Fig. 3 of the handheld power tool 100 of Fig. 1 with reduced power of the battery packs 192, 194 of Fig. 1. Here, the battery pack charge status display 222 visualizes, by way of example, the full charge status or the unrestricted availability of the battery packs 192, 194 of Fig. 1 at full power, while the display element 225, by way of example in the representation form 529 of Fig. 5, visualizes the restricted availability of the battery pack 194 of Fig. 1 at reduced power, wherein the restricted availability is associated with a temperature warning for the battery pack 194 of Fig. 1 by the status display 232. Furthermore, the overall status display 210 in the representation form 312 of Fig.3 the limited joint availability of the battery packs 192, 194 of Fig.

[0064] 1 at reduced power.

Claims

Claims 1. Hand-held power tool (100) with a first battery pack (192) and at least one second battery pack (194), and with a battery pack status display unit (150) which has a single battery pack charge status display (222), characterized in that the battery pack status display unit (150) further has a first display element (224) assigned to the first battery pack (192) and at least one second display element (225) assigned to the at least one second battery pack (194), wherein the battery pack charge status display (222) is operatively connected to the first and the at least one second display element (224, 225) in such a way that at least three different availability states of the battery packs (192, 194) can be displayed thereon.

2. Hand-held power tool according to claim 1, characterized in that the availability states are assigned to such different display forms (228, 229, 329, 429, 529, 629) that, in conjunction with the battery pack charge state display (222), the first display element (224) visualizes in a first display form (228) an unrestricted availability of the first battery pack (192) at full power, in a second display form (329) a restricted availability of the first battery pack (192) at reduced power, and in a third display form (429) a non-availability of the first battery pack (192), and the at least one second display element (225) visualizes in a fourth display form (229) an unrestricted availability of the at least one second battery pack (194) at full power, in a fifth display form (529) a restricted availability of the at least one second battery pack (194) at reduced power,and in a sixth representation form (629) visualizes a non-availability of the at least one second battery pack (194).

3. Hand tool according to claim 1 or 2, characterized in that the display elements (224, 225) and the battery pack charge level indicator (222) automatically display the availability level of the battery pack (192, 194) with the lowest availability.

4. Hand tool according to claim 2 and 3, characterized in that the battery pack status display unit (150) has an overall status display (210) which, in a seventh display form (212), visualizes unrestricted joint availability of the battery packs (192, 194) at full power, in an eighth display form (312) visualizes restricted joint availability of the battery packs (192, 194) at reduced power, and in a ninth display form (412) visualizes non-availability of the first or the second battery pack (192, 194).

5. Hand tool according to one of claims 2 to 4, characterized in that the display forms (228; 329; 429) for the availability states of the first battery pack (192), the display forms (229; 529; 629) for the availability states of the at least one second battery pack (194) and the display forms (212, 312, 412) for the common availability states are assigned different lighting effects and / or colors.

6. Hand tool according to one of the preceding claims, characterized in that a measuring unit (170) is provided which determines measured values ​​associated with the first battery pack (192) and / or the at least one second battery pack (194) in order to determine the respective availability state.

7. Hand tool according to claim 6, characterized in that the measuring unit (170) has at least one voltmeter, wherein the measured values ​​determined comprise battery pack voltages.

8. Hand tool according to claim 6 or 7, characterized in that a control device (160) is provided which, depending on the measured values ​​determined, controls the battery pack charge level indicator (222) and the first display element (224) in each case for visualizing the Display form (228; 329; 429) for the availability state of the first battery pack (192) and / or the battery pack charge state display (222) and the second display element (225) each for visualizing the display form (229; 529; 629) for the availability state of the at least one second battery pack (192).

9. Hand tool according to claim 8, characterized in that the control device (160) has a lookup table in which the representation forms (228; 329; 429; 229; 529; 629) are each assigned to different measured value ranges of the determined measured values.

10. Hand tool according to one of claims 7 to 9, characterized in that the control device (160) compares a first instantaneous battery pack voltage determined by the measuring unit (170) for the first battery pack (192) with a second instantaneous battery pack voltage determined by the measuring unit (170) for the at least one second battery pack (194) to determine a respective smaller battery pack voltage and controls the battery pack charge level indicator (222) to display a battery pack charge level associated with the respective smaller battery pack voltage.

11. Hand tool according to one of the preceding claims, characterized in that the battery pack charge level indicator (222) is assigned a selection element (244) with which the battery pack charge level indicator (222) can be assigned selectively to the first battery pack (192) or to the at least one second battery pack (194).

12. Hand tool according to claim 11, characterized in that the selection element (244) can be assigned jointly to the battery packs (192, 194).

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