Display device for battery pack
By using short-circuit display elements and transistors to control electrical signals in the battery pack display device, the problems of high cost and complex structure in the prior art are solved, and low-cost, simple and reliable charging status display is realized, suitable for electric tools .
Patent Information
- Application Number
- CN201980079711.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2018-10-02
- Filing Date
- 2019-09-23
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2039-09-23
AI Technical Summary
The existing battery pack display devices have problems such as high cost, complex structure and inconvenient operation when displaying charging status. Especially in power tools, it is difficult to realize a simple, compact and reliable display solution.
A display device including a charging state display unit and a control circuit is designed to indicate the charging state by short-circuit display elements, and to control the electrical signal by using transistors and control resistors, simplifying the measurement of the set voltage and signal transmission, and reducing the use of expensive components. , and improves the flexibility and reliability of display through components such as conductor loops and diodes.
It realizes a low-cost, simple, compact and reliable state of charge display, saves electrical connections and voltage measurement components, improves the safety and operational friendliness of the display device, and reduces processor load and current consumption.
Smart Images
Figure CN113167836B_ABST
Abstract
Description
Background Art
[0001] A display device for a battery pack, in particular a battery pack for an electric tool, has been proposed, the display device being used to display the charge state of the battery pack, the display device comprising at least one charge state display unit and at least one control line, the at least one charge state display unit having at least one display element for displaying the charge state of the battery pack, the at least one control line being used to transmit at least one electrical signal and / or electronic signal, which is particularly dependent on the charge state of the battery pack, from a control unit of the battery pack which is separated, in particular structurally separated, from the charge state display unit, in particular from main control electronics of the battery pack, to the charge state display unit. Summary of the invention
[0002] The present invention is based on a display device for a battery pack, in particular a battery pack of an electric tool, the display device being used to display the charge state of the battery pack, the display device having at least one charge state display unit and at least one control line, the at least one charge state display unit having at least one display element for displaying the charge state of the battery pack, the at least one control line being used to transmit at least one electrical signal and / or electronic signal, which is particularly dependent on the charge state of the battery pack, from a control unit of the battery pack which is separated, in particular structurally separated, from the charge state display unit, in particular from main control electronics of the battery pack, to the charge state display unit.
[0003] It is proposed that the charge state display unit is configured to short-circuit at least one display element according to an electrical signal and / or an electronic signal transmitted via a control line. Preferably, the display device for displaying the charge state of the battery pack comprises at least one charge state display unit and at least one control line, the at least one charge state display unit having at least one display element for displaying the charge state of the battery pack, the at least one control line being used to transmit at least one electrical signal and / or an electronic signal from a control unit of the battery pack that is separate from the charge state display unit to the charge state display unit.
[0004] Advantageously, the display device is configured to output the charge state of the battery pack, in particular at least as a function of the pack voltage of the battery pack, via the at least one display element. Preferably, the proportional charge state of the battery pack is displayed to the user via the ratio of the number of short-circuited display elements to the total number of display elements. Advantageously, the display device is at least partially arranged on an outer wall of the housing of the battery pack. Preferably, the display device is arranged in and / or on the housing of the battery pack in such a way that, in particular when the battery pack is arranged in a device operated with batteries, at least the display element is accessible and / or visible to the user. The display device is particularly configured to be spatially separated or spaced apart from the remaining electronic devices, in particular the control unit of the battery pack and / or the main control electronics of the battery pack. Preferably, at least the control line connects the display device, in particular electrically conductively, to the remaining electronic devices, in particular the control unit of the battery pack and / or the main control electronics of the battery pack. Advantageously, the control unit of the battery pack is configured to control the display device by means of the electrical and / or electronic signals.
[0005] Preferably, the electrical signal and / or electronic signal is constructed as a voltage level and / or current level. Advantageously, the electrical signal and / or electronic signal is generated by a control unit of the battery pack, in particular the main control electronics of the battery pack, according to the charge state of the battery pack. "Set" should be understood in particular as being programmed, designed and / or equipped specifically. An object is set for a certain function, in particular, to be understood as: the object performs and / or implements this certain function in at least one application state and / or operating state. "Short circuit" should be understood in particular as bridging an electrical component by means of the connection of two electrical conductors of a current loop, wherein at least a large part of the current flows through the electrical conductor, and the current flowing through the electrical component, in particular the high resistance of the electrical component, is at least substantially negligible compared to the current flowing through the electrical conductor. In this case, "at least substantially negligible" should be understood in particular as: a value is so small, particularly preferably close to zero, that the measurement and / or function of the value does not cause any visible and / or other recognizable effects and / or reactions in the device. Preferably, the current flowing through the display element is so low as a result of the short-circuiting of the display element that the display element is not activated.
[0006] Advantageously, the charging state display unit has at least more than one display element. Preferably, the charging state display unit has exactly three display elements. However, it is also conceivable that the charging state display unit has a number of display elements different from exactly three, for example exactly four, exactly five or more display elements. Advantageously, the at least one display element is configured as a light emitting diode (LED) and / or an LED light emitting element, in particular an LED light strip. However, other display element configurations known to those skilled in the art are also conceivable. The charging state display unit has in particular at least one resistor, at least one display element and at least one conversion element for short-circuiting the display element according to an electrical signal and / or an electronic signal transmitted via a control circuit.
[0007] Advantageously, the display device has exactly three lines, which connect the display device, in particular the charge state display unit of the display device, at least to the remaining electronics of the battery pack. However, it is also conceivable that the display device, in particular the charge state display unit, has a number of lines different from three in order to connect the display device, in particular the charge state display unit, to the remaining electronics of the battery pack. Advantageously, the display device has exactly one control line, exactly one supply line and exactly one ground line. The supply line connects the display device, in particular the charge state display unit of the display device, at least to the energy storage unit of the battery pack, in particular to provide a pack voltage that depends at least on the charge state of the battery pack. Preferably, the ground line connects the display device, in particular the charge state display unit of the display device, at least to ground as zero potential, in particular to a grounder and / or a protective conductive grid of the battery pack or of an electric tool connected to the battery pack.
[0008] By means of the configuration of the display device according to the invention, an advantageously simple, compact and at the same time flexibly positionable display device can be realized at an advantageously low cost, in particular because expensive components, such as electrical connections for operating individual display elements or components for individually measuring the pack voltage of a battery pack, can be saved.
[0009] In addition, it is proposed that the charging state display unit has at least one transistor element, which is arranged in parallel with the display element and is configured to at least short-circuit the display element according to the electrical signal and / or electronic signal transmitted by the control circuit. Preferably, the transistor element is configured as at least one transistor, at least one bipolar transistor or at least one field effect transistor. Advantageously, the transistor element is connected by the electrical signal and / or electronic signal through the control circuit. Preferably, the display element is at least short-circuited by connecting the transistor element. Advantageously, the transistor element is arranged so that the conductor loop (Leitermasche) is constructed as having no components except the display element and the transistor element. However, it is conceivable that the conductor loop has at least one resistor between the display element and the transistor element. "Conductor loop" should be understood in particular as a closed circuit composed of any electrical component, wherein the conductor loop can be connected to other conductive components through any number of nodes. Preferably, in the case of multiple display elements, the charging state display unit has at least one transistor element for each display element. An advantageously simple and compact display device can be realized by the embodiment according to the invention, since in particular the measurement of the pack voltage of the battery pack can be omitted and all display elements can be controlled by one signal.
[0010] It is further proposed that the display device has at least two control resistors which are electrically connected to the control circuit and which are respectively connected, in particular directly, to at least one signal output of the control unit of the battery pack. A "control resistor" is to be understood in particular as a two-pole passive electrical element for realizing an ohmic resistance in an electrical and / or electronic circuit, which control resistor, in particular in a control circuit, at least significantly changes a signal for controlling an electrical component, in particular a charge state display unit. "At least significantly changes" is to be understood in particular as meaning that a parameter and / or a signal value and / or a measured value is changed by at least 20%, preferably 30%, particularly preferably 40% of its original magnitude. Preferably, the control resistors are provided for generating at least more than one different electrical and / or electronic signal for controlling the charge state display unit from at least two voltage levels of a signal output of a control unit of the battery pack, in particular a main control electronics of the battery pack. Preferably, exactly one voltage level is output by each signal output of the control unit of the battery pack, in particular depending on the charge state of the battery pack. Advantageously, the control resistor is configured to generate exactly four different electrical and / or electronic signals, in particular exactly four different voltage levels, for controlling the charge state display unit from exactly two corresponding voltage levels of the control unit of the battery pack. However, it is also conceivable that the control resistor generates a number of voltage levels for controlling the charge state display unit that is different from exactly four voltage levels from a number of voltage levels of the control unit that is different from exactly two voltage levels. By means of the configuration according to the invention, an advantageously high speed and reliability of the display device can be achieved, since the voltage levels required for controlling the charge state display unit can be generated faster than, for example, by means of charging and discharging a capacitor. In addition, by means of the configuration according to the invention, an advantageously low processor load of the control unit of the battery pack can be achieved.
[0011] It is further proposed that the display device has at least one operating unit, which has at least one operating element, which is arranged to activate the charge state display unit by a control unit of the battery pack, in particular the main control electronics of the battery pack. Advantageously, the operating unit is connected at least to the supply line and the control line. Preferably, the operating element is arranged between the supply line and the ground line. Preferably, the operating element is designed as a switch, a button and / or a joystick. However, other operating element configurations that are considered meaningful by a person skilled in the art are also conceivable. Advantageously, the operating unit includes at least one transistor and at least one resistor, in particular in addition to the operating element. Additionally or alternatively, it is conceivable that the operating unit has at least one diode, in particular in addition to the operating element, which is arranged in particular to limit the voltage drop on the resistor of the operating unit, in particular to reduce the reduction of the pack voltage of the battery pack and / or to reduce the falling thermal power. Preferably, the operating unit has two diodes connected in series. Preferably, when the operating element is operated, the transistor of the operating unit is turned on, thereby changing at least one voltage level on the control unit of the battery pack, wherein in particular at least one voltage level is output at the signal output of the control unit of the battery pack, in particular to activate the charge state display unit via the control line. The configuration according to the invention makes it possible to achieve an advantageously reliable and error-free display device with advantageously high user-friendliness and advantageously low current consumption, in particular because the overall voltage drop across the resistor can be reduced during operation by the operating unit. Interfering power losses in the display device can be additionally reduced by an alternative configuration with a series-connected diode. Furthermore, the configuration according to the invention ensures that the pack voltage is sufficient to supply the display element for at least substantially all charge states of the battery pack.
[0012] In addition, it is proposed that the charging state display unit includes at least one voltage stabilization unit, which has at least one Zener diode. Preferably, the voltage stabilization unit is constructed at least between the supply line and the rest of the charging state display unit. Preferably, the voltage stabilization unit is arranged to reduce the thermal power drop of the charging state display unit. Preferably, the voltage stabilization unit is arranged to prevent the flow of current in the static state of the charging state display unit. Advantageously, the Zener diode is arranged in the cut-off direction relative to the supply line. However, it is also conceivable that the voltage stabilization unit has a transistor and a resistor connected in parallel with the Zener diode in addition to the Zener diode, wherein in particular the transistor is turned on through the resistor and the Zener diode, and when turned on, the group voltage of the battery pack is applied to the rest of the charging state display unit. Through the configuration according to the present invention, a display device can be realized with an advantageous low current consumption, especially because the voltage on the supply line can be limited by the Zener diode. In addition, the reduced power can be distributed between multiple components, especially between the Zener diode, the transistor and the resistor, through the configuration according to the present invention.
[0013] It is further proposed that the charge state display unit has at least one redistribution resistor, which is provided for distributing the power drop in the charge state display unit, wherein the redistribution resistor is arranged between the display element and the transistor element of the charge state display unit. A "redistribution resistor" is to be understood in particular as a two-pole passive electrical element for realizing an ohmic resistance in an electrical and / or electronic circuit, by which the power drop (in particular caused by heat) in the electrical and / or electronic circuit is distributed to at least two components, in particular resistors, in the electrical and / or electronic circuit. Preferably, the redistribution resistor is constructed in a conductor loop with the display element and the transistor element. Advantageously, in the case of a plurality of display elements, the charge state display unit has at least one redistribution resistor for each display element. Instead of or in addition to the at least one redistribution resistor, at least one additional transistor can be used in the charge state display unit, which is provided for distributing the current for supplying the at least one display element to a plurality of points in the display device, and thus in particular also distributing the power drop in the form of heat to a plurality of points in the display device. The embodiment according to the invention makes it possible to achieve an advantageous safety display device, since the power converted into heat is distributed to a plurality of points within the display device, in particular via at least one redistribution resistor. This makes it possible to avoid local overheating within the battery pack, which can often lead to damage to the battery pack, to a tool operated with the battery pack, and / or to a user.
[0014] Furthermore, a battery pack, in particular a battery pack for an electric tool, is proposed, which has at least one control unit, in particular main control electronics, and at least one display device according to the invention. Preferably, the control unit of the battery pack, in particular the main control electronics of the battery pack, is connected to the display device, in particular in an electrically conductive manner. Advantageously, the display device is at least partially arranged on the outer wall of the battery pack. Preferably, at least one display element of the display device is arranged on the outer wall of the battery pack, in particular so arranged that the display element can be easily seen and / or touched by a user in the installed state of the battery pack. Advantageously, the battery pack comprises at least one energy storage unit, which is at least temporarily, in particular electrically conductively, connected to the control unit of the battery pack, in particular the main control electronics of the battery pack, and the display device. Preferably, the energy storage unit provides at least one pack voltage, which is applied to the display device and / or the control unit of the battery pack, in particular the main control electronics of the battery pack, depending on the charge state. Advantageously, the display device is configured to output at least one instantaneous charge state of the battery pack by short-circuiting at least one display element of the display device. Preferably, the display element is short-circuited depending on the instantaneous charge state of the battery pack. Preferably, the display device has at least two, in particular exactly three, exactly four or exactly five display elements, wherein, in particular as the instantaneous state of charge of the battery decreases, a greater number of display elements are short-circuited, the ratio of which to the total number of display elements being in particular the same as the ratio of the instantaneous state of charge of the battery pack to the maximum battery capacity. By means of the embodiment according to the invention of the battery pack with the display device, an advantageously safe and compact battery pack can be realized at advantageously low costs.
[0015] The invention also proceeds from a method for displaying the charge state of a battery pack, in particular a battery pack of a power tool, by means of at least one display device according to the invention. It is provided that in at least one method step, at least one display element of the charge state display unit is short-circuited as a function of an electrical and / or electronic signal transmitted via a control line from a control unit of the battery pack, in particular main control electronics of the battery pack, the control unit being separate, in particular structurally separate, from the charge state display unit, the electrical and / or electronic signal being dependent in particular on the charge state of the battery pack.
[0016] Advantageously, the method is used to display the charge state of the battery pack, in particular the proportional charge state of the battery pack, by means of the ratio of the number of short-circuited display elements to the total number of display elements of the display device. Preferably, the display elements are short-circuited when the pack voltage of the battery pack is below a predefined and / or dynamically determined limit value. Preferably, the limit value is designed as a percentage of the maximum capacity of the battery pack. By configuring the method according to the invention, the charge state can be displayed simply at an advantageously low cost. In addition, by configuring the method according to the invention, an advantageously cost-effective method for displaying the charge state can be achieved, in particular because expensive components, such as electrical connections for actuating individual display elements or components for individually measuring the pack voltage of the battery pack, can be saved.
[0017] It is further proposed that in at least one method step, at least one or more different electrical and / or electronic signals for controlling the charge state display unit are generated by means of at least two control resistors from at least two voltage levels of a control unit of the battery pack, in particular of main control electronics of the battery pack. Advantageously, the different electrical and / or electronic signals for controlling the charge state display unit are generated passively by means of the control resistors from at least two voltage levels of the control unit of the battery pack, in particular as soon as the voltage levels are applied to the signal output of the control unit of the battery pack. The configuration according to the invention advantageously makes it possible to quickly display the charge state, since in particular the charging and discharging of capacitors for generating the different signals can be omitted.
[0018] It is further proposed that the short-circuiting of the display element is carried out by at least one transistor element of the charge state display unit, which is switched on according to an electrical signal and / or an electronic signal of a control unit of the battery pack. Preferably, the switching on of the transistor element is carried out according to the charge state of the battery pack by means of an electrical signal and / or an electronic signal. Advantageously, in the case where a plurality of display elements are used to carry out the method, the short-circuiting of a display element is respectively carried out by means of a transistor element. Each transistor element is switched on, in particular, by means of a different voltage level of the electrical signal and / or the electronic signal. Preferably, a higher voltage level of the electrical signal and / or the electronic signal corresponds to a lower charge state of the battery pack relative to an initial state of the at least substantially fully charged battery pack, whereby, in particular in a lower charge state of the battery pack, a higher number of display elements are short-circuited. By means of the configuration according to the invention, an advantageously simple, energy-saving and cost-effective display of the charge state can be achieved, since in particular a separate control of the display element can be omitted.
[0019] It is further proposed that the charge state display unit is supplied with current by at least one supply line by means of at least one group voltage of the battery pack. Preferably, the group voltage is converted by means of at least one resistor in the supply line and / or the charge state display device in order to supply at least one display element. Preferably, the supply of at least one display element is carried out via at least two diodes connected in series and via a resistor, wherein the diode is arranged to switch on the transistor by means of the group voltage so that the group voltage is thereby applied to the display element via the resistor. Advantageously, the diode operates in the conducting direction. By means of the configuration according to the invention, an advantageously compact and cost-effective display of the charge state can be achieved, since in particular expensive additional lines for supplying the display element can be omitted.
[0020] In this context, the display device according to the invention, the battery pack according to the invention and / or the method according to the invention are not to be restricted to the above-described applications and embodiments. In particular, the display device according to the invention, the battery pack according to the invention and / or the method according to the invention may have a number of individual elements, components and units and method steps that differ from the number mentioned therein in order to achieve the mode of action described herein. Furthermore, for the value ranges specified in the disclosure, the values within the stated limits are also to be regarded as disclosed and may be used arbitrarily. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Further advantages emerge from the following description of the drawings. Seven embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain a combination of numerous features. A person skilled in the art will consider these features individually and combine them into other meaningful combinations in a suitable manner. The drawings show:
[0022] Figure 1 A schematic diagram of an electric tool having a battery pack according to the invention, the battery pack having a display device according to the invention,
[0023] Figure 2 shows a schematic diagram of a battery pack according to the invention having a display device according to the invention,
[0024] Figure 3 A schematic diagram showing a display device according to the present invention,
[0025] Figure 4 A schematic diagram showing the flow of the method according to the present invention when using the display device according to the present invention,
[0026] Figure 5 A schematic diagram showing a wiring diagram of a display device according to the present invention,
[0027] Figure 6 A schematic diagram showing a wiring diagram of a first alternative display device according to the invention with a wiring diagram,
[0028] Figure 7 A schematic diagram showing a wiring diagram of a second alternative display device according to the present invention,
[0029] Figure 8 A schematic diagram showing a wiring diagram of a third alternative display device according to the present invention,
[0030] Fig. 9 A schematic diagram showing a wiring diagram of a fourth alternative display device according to the present invention,
[0031] Fig.10 A schematic diagram showing a wiring diagram of a fifth alternative display device according to the present invention,
[0032] Fig.11 A schematic diagram showing a wiring diagram for a sixth alternative display device according to the present invention. DETAILED DESCRIPTION
[0033] Figure 1 A schematic diagram of an electric tool 10 with a replaceable battery pack 12a is shown, wherein the battery pack 12a has a display device 14a for displaying the charge state of the battery pack 12a. The electric tool 10a shown is configured as a drill. However, it is also conceivable that the electric tool 10a is configured as a hammer drill, impact hammer, saw, planer, screwdriver, milling cutter, grinder, angle grinder, gardening tool, construction site measuring instrument and / or multi-function tool with at least one fixedly integrated or replaceable battery pack 12a. The battery pack 12a is configured to supply energy to the electric tool 10a.
[0034] Figure 2 A schematic diagram of a battery pack 12a with a display device 14a for displaying the charge state of the battery pack 12a is shown. The battery pack 12a has at least one control unit 16a, which is in particular designed as a main control electronics of the battery pack 12a, and at least one energy storage device 26a. Advantageously, the control unit 16a of the battery pack 12a is configured to control the display device 14a by means of at least one electrical signal and / or electronic signal. The control unit 16a of the battery pack 12a is in particular electrically conductively connected to the display device 14a and the energy storage device 26a.
[0035] Figure 3A schematic diagram of a display device 14a of a battery pack 12a is shown. The display device 14a has a charge status display unit 18a as well as a control line 20a, a supply line 22a and a ground line 24a. The control line 20a connects the control unit 16a of the battery pack 12a to the charge status display unit 18a, in particular in an electrically conductive manner. The ground line 24a is provided for grounding at least the charge status display unit 18a to zero potential. Preferably, the ground line 24a is configured as a grounder and / or a protective conductive grid of the battery 12a or of the electric tool 10a connected to the battery pack 12a, or as another configuration that is considered meaningful by a person skilled in the art. The supply line 22a is provided for providing the display device 14a with a group voltage of an energy storage device 26a of the battery pack 12a, wherein the group voltage in particular defines the charge status of the battery pack 12a. The supply line 22a is connected in a particularly electrically conductive manner to at least the charge status display unit 18a. Particularly preferably, the group voltage is also applied to the control unit 16a of the battery pack 12a, but this is not necessary in the present invention. Figure 3 Not shown.
[0036] Figure 4 A schematic diagram of the sequence of a method 37a for displaying the state of charge of a battery pack 12a, in particular when using a display device 14a, is shown. In at least one method step 42a of the method 37a, at least one or more different electrical and / or electronic signals for controlling a charge state display unit 18a are generated by means of at least two control resistors 32a from at least two voltage levels of a control unit 16a of the battery pack 12a. In at least one method step 44a of the method 37a, at least one display element 28a, 28a', 28a" of the charge state display unit 18a is short-circuited as a function of an electrical and / or electronic signal of a control unit 16a of the battery pack 12a, in particular of a main control electronics of the battery pack 12a, which is transmitted via a control line 20a, and which electrical and / or electronic signal is in particular dependent on the charge state of the battery pack 12a. In at least one method step 46a of the method 37a, the charge state of the battery pack 12a is displayed by means of the remaining display elements 28a, 28a', 28a" which are in particular not short-circuited.
[0037] exist Figure 5A schematic diagram of the wiring diagram of the display device 14a of the battery pack 12a is shown in the figure. The charging status display unit 18a has three display elements 28a, 28a', 28a". Preferably, in particular when the battery pack 12a is at least substantially fully charged, the three display elements 28a, 28a', 28a" are connected together by the control unit 16a. The charging status display unit 18a is particularly configured to short-circuit two display elements 28a', 28a" of the display elements based on an electrical signal and / or electronic signal transmitted via the control line 20a. The display elements 28a, 28a', 28a" are configured as light-emitting diodes (LEDs). However, it is also conceivable that the display elements 28a, 28a', 28a" are configured as other configurations that appear meaningful to a person skilled in the art. However, Figures 5 to 11 The circuit of the display device 14a-g shown is particularly preferably configured for display elements 28a, 28a', 28a". The charging status display unit 18a has a plurality of transistor elements 30a, 30a', 30a", 62a. The charging status display unit 18a has a first transistor element 30a, a second transistor element 30a', a third transistor element 30a", and a further transistor element 62a. The first transistor element 30a is preferably configured for regulating the current of all three display elements 28a, 28a', 28a" via the further transistor element 62a. The second and third transistor elements 30a', 30a" of the charge status display unit 18a are arranged in parallel connection with one of the display elements 28a', 28a" respectively and are configured to short-circuit one of the display elements 28a', 28a" respectively according to an electrical signal and / or an electronic signal transmitted via the control line 20a, in particular according to the charge status of the battery pack 12a. The second and third transistor elements 30a', 30a" which are preferably configured to short-circuit the two display elements 28a', 28a" are constructed as field effect transistors. The first transistor element and the further transistor elements 30a, 62a which are configured to regulate the current of the display elements 28a, 28a', 28a" are constructed as complementary bipolar transistors. However, it is also conceivable that the transistor elements 30a, 30a', 30a", 62a are constructed as conventional transistors and / or as other configurations that are considered meaningful by a person skilled in the art. Preferably, when the group voltage of the battery pack 12a decreases, the second and third transistor elements 30a', 30a" are switched on one by one by the control unit 16a and the display elements 28a', 28a" are short-circuited one by one, so that the display elements 28a', 28a" are turned off at least essentially without current. When the group voltage decreases further, the transistor element 30a is preferably converted to a current-free state, thereby also converting the last remaining display element 28a to a current-free state.
[0038] The display elements 28a, 28a', 28a'' are supplied with current via the supply line 22a with the aid of two diodes 60a, the further transistor elements 62a and the resistor 64a. By switching on the further transistor element 62a, in particular a current loop with the display elements 28a, 28a', 28a'' is closed. If a voltage level is applied to the control line 20a, the current supply of the display elements 28a, 28a', 28a'' is activated via the first transistor element 30a. When the voltage level of the control line 20a is high, the second and third transistor elements 30a', 30a'' are switched on, in particular in order to short-circuit the display elements 30a', 30a'' as a function of the charge state of the battery pack 12a.
[0039] The control circuit 20a has two control resistors 32a electrically conductively connected to the control circuit 20a, which are respectively directly connected to the signal output 34a of the control unit 16a of the battery pack 12a. Preferably, the control resistors 32 are configured to generate exactly four different electrical and / or electronic signals, in particular exactly four different voltage levels, for controlling the charge state display unit 18a from two voltage levels of the control unit 16a of the battery pack 12a. Preferably, the control unit 16a is configured such that the voltage level at the signal output 34a changes as a function of the group voltage, in particular in order to control the charge state display unit 18a. Alternatively, it is conceivable that the signal generation is not generated by the two control resistors 32a, but rather by a resistor connected to the signal output 34a of the control unit 16a and a capacitor arranged between the ground line 24a and the control circuit 20a to generate the electrical and / or electronic signal for controlling the charge state display unit 18a. Preferably, charge state display unit 18a is connected to the remaining electronics of battery pack 12a only via the one supply line 22a, via the one control line 20a and via the one ground line 24a.
[0040] The display device 14a is Figure 5 The unmarked resistors are at least mostly configured to change, in particular match, electrical and / or electronic signals of the control unit 16a and / or the group voltage of the battery pack 12a so that different transistor elements 30a, 30a', 30a", 62a can be switched on via different voltage levels depending on the charge state of the battery 12a and / or the group voltage can be matched for supplying the display elements 28a, 28a', 28a".
[0041] exist Figures 6 to 11The following description and drawings are essentially limited to the differences between the exemplary embodiments, wherein, with respect to identically labeled components, in particular with respect to components having the same reference numerals, reference can in principle also be made to the other exemplary embodiments, in particular Figures 1 to 5 In order to distinguish the embodiments, Figures 1 to 5 The reference numerals of the embodiments in the drawings are followed by the letter a. Figures 6 to 11 In the embodiment of FIG. 1 , the letter a is replaced by letters b to g.
[0042] exist Figure 6 1 shows a schematic diagram of the wiring diagram of the first alternative display device 14b of the battery pack 12b. The display device 14b is constructed at least in the same manner as the display device 14a, but the display device 14b additionally includes an operating unit 36b. The operating unit 36b has an operating element 38b, which is configured to activate the charge state display unit 18b of the display device 14b by the control unit 16b of the battery pack 12b, especially by the main control electronics of the battery pack 12b. The operating element 38b is configured as a key. However, it is also conceivable that the operating element 38b is configured as a switch, a joystick and / or other configurations that are considered meaningful by those skilled in the art. In addition, the operating unit 36b includes a transistor 66b and five additional resistors 68b, 70b, 72b, 74b, through which the supply line 22b of the display device 14b is connected to the control unit 16b of the battery pack 12b and to the ground line 24b of the display device 14b. Advantageously, the operating element 38b and the resistor 68b of the operating unit 36b are arranged together with the charge state display unit 18b, in particular on a printed circuit board of the display device 14b. Preferably, the printed circuit board with the charge state display unit 18b and the operating element 38b and the resistor 68b of the operating unit 36b is connected to the remaining electronics of the battery pack 12b only via the one supply line 22b, via the one control line 20b and via the one ground line 24b.
[0043] If the operating element 38b is actuated, a current flows through the operating element 38b, the resistors 68b, 70b and a part of the supply line 22b. This causes a voltage drop across the resistor 70b. Due to this voltage drop, the transistor 66b is switched on via the resistor 72b, and the resistor 74b of the operating unit 36b acts as a voltage divider, wherein the current flowing through the voltage divider is detected as a signal at the signal input 76b of the control unit 16b of the battery pack 12b.
[0044] exist Figure 7, a schematic diagram of a wiring diagram of a second alternative display device 14c of a battery pack 12c is shown. The display device 14c is constructed at least in large part in the same manner as the display device 14b, however, the charge state display unit 18c of the display device 14c additionally includes a voltage stabilization unit 40c constructed as a Zener diode. The voltage stabilization unit 40c is constructed between the supply line 22c of the display device 14c and the remaining charge state display units 18c. Preferably, the voltage stabilization unit 40c is configured to reduce the thermal power drop of the charge state display unit 18c. Preferably, the voltage stabilization unit 40c is configured to prevent current flow in the charge state display unit 18c in a static state. Advantageously, the voltage stabilization unit 40c constructed as a Zener diode is arranged in the cut-off direction relative to the supply line 22c.
[0045] Figure 8 Schematic diagram showing the connection diagram of a third alternative display device 14d of a battery pack 12d. Display device 14d is constructed at least in large part in the same manner as display device 14c, but voltage stabilization unit 40d of display device 14d comprises a transistor and a resistor connected in parallel with the Zener diode in addition to the Zener diode. Preferably, the transistor is switched on via the resistor and the Zener diode, so that when the transistor is switched on, the pack voltage of battery pack 12d is applied to the remaining charge status display unit 18d.
[0046] Fig. 9 A schematic diagram of a wiring diagram of a fourth alternative display device 14e of a battery pack 12e is shown. The display device 14e is constructed at least in large part in the same manner as the display device 14b, but the charge state display unit 18e of the display device 14e additionally includes two redistribution resistors 48e. The redistribution resistors 48e are arranged in the conductor loop of each display element 28e of the charge state display unit 18e. The redistribution resistors 48e are provided to distribute the power drop in the display device 14e as heat to a plurality of points, in particular in order to avoid local overheating in the battery pack 12e. The charge state display unit 18e includes a further transistor 50e, which is provided to distribute the current for supplying the display element 28e to a plurality of points in the display device 14e, and thus also to distribute the power drop in the form of heat to the plurality of points.
[0047] Fig.10A schematic diagram of a connection diagram of a fifth alternative display device 14f of a battery pack 12f is shown. The display device 14f is designed at least in large part in the same manner as the display device 14b, but the charge state display unit 18f of the display device 14f has a total of four display elements 28f, 52f designed as light-emitting diodes. Compared with the display device 14b, the charge state display unit 18f additionally includes a further display element 52f and a further transistor element 54f, which is configured to short-circuit the further display element 52f in response to an electrical signal and / or an electronic signal of the control unit 16f of the battery pack 12f. In addition, the operating unit 36f of the display device 14f includes two diodes 56f, which are configured to limit the voltage drop via a resistor 58f of the operating unit 36f connected in parallel with the two diodes 56f.
[0048] exist Fig.11 1 shows a schematic diagram of a wiring diagram of a sixth alternative display device 14g of a battery pack 12g. The display device 14g is constructed at least in large part in the same structure as the display device 14f, however, the charge state display unit 18g of the display device 14g has a total of five display elements 28g, 52g constructed as light-emitting diodes. The other display element 52g is arranged in parallel connection with the remaining three display elements 28g. In particular, it is possible that from a certain number of display elements 28g connected in series, the group voltage of the battery pack 12g is no longer sufficient to supply the display elements 28g, 52g with a sufficiently high voltage. The charge state display unit 18g has a further transistor element 54g for each of the two further display elements 52g, which is configured to short-circuit the further display element 52g in the conductor loop of the corresponding transistor element 54g according to an electrical signal and / or an electronic signal of the control unit 16g of the battery pack 12g.
Claims
1. A display device for a battery pack of an electric tool, the display device being used to display the charging state of the battery pack, the display device comprising at least one charging state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g) and a control circuit (20a; 20b; 20c; 20d; 20e; 20f; 20g), the at least one charging state display unit comprising at least one display element (28a; 28b; 28c; 28d; 28e; 28f, 52f; 28g, 52g) for displaying the charging state of the battery pack (12a; 12b; 12c; 12d; 12e; 12f; 12g), The one control line is used to transmit at least one electrical signal and / or electronic signal depending on the charging state of the battery pack (12a; 12b; 12c; 12d; 12e; 12f; 12g) from a control unit (16a; 16b; 16c; 16d; 16e; 16f; 16g) of the battery pack (12a; 12b; 12c; 12d; 12e; 12f; 12g) to the charging state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g), the control unit being separate from the charging state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g), wherein The charge status display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g) is configured to short-circuit at least one display element (28a; 28b; 28c; 28d; 28e; 28f, 52f; 28g, 52g) according to an electrical signal and / or an electronic signal transmitted via the control line (20a; 20b; 20c; 20d; 20e; 20f; 20g), characterized in that at least two control resistors (32a) are provided which are electrically conductively connected to the control line (20a; 20b; 20c; 20d; 20e; 20f; 20g), each of which is directly connected to a control unit (16a; 16b; 16c; 16d) of the battery pack (12a; 12b; 12c; 12d; 12e; 12f; 12g) 6d; 16e; 16f; 16g), each signal output terminal (34a) of the battery pack control unit (16a; 16b; 16c; 16d; 16e; 16f; 16g) outputs at least one voltage level, the voltage level on each signal output terminal (34a) changes according to the group voltage of the battery pack, and the group voltage defines the charging state of the battery pack, and the at least two control resistors (32a) are configured to generate at least more than one different electrical signal and / or electronic signal for controlling the charging state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g) from at least two voltage levels of the control unit (16a; 16b; 16c; 16d; 16e; 16f; 16g) of the battery pack.
2. The display device according to claim 1, characterized in that The charging state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g) has at least one transistor element (30a; 54g; 54f) which is arranged in parallel with the display element (28a; 28b; 28c; 28d; 28e; 28f, 52f; 28g, 52g) and is configured to be used according to the control circuit (20a; 20b; 20c; 20d; 20e; 20f; 20g) The electrical signal and / or electronic signal transmitted by at least short-circuit the display element (28a; 28b; 28c; 28d; 28e; 28f, 52f; 28g, 52g).
3. The display device according to claim 1 or 2, characterized in that: At least one operating unit (36b; 36c; 36d; 36e; 36f) is provided, which has at least one operating element (38b), and the at least one operating element is configured to activate the charging state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g) via a control unit (16a; 16b; 16c; 16d; 16e; 16f; 16g) of the battery pack (12a; 12b; 12c; 12d; 12e; 12f; 12g).
4. The display device according to claim 1 or 2, characterized in that: The charging state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g) comprises at least one voltage stabilization unit (40c; 40d), and the at least one voltage stabilization unit has at least one Zener diode.
5. The display device according to claim 1 or 2, characterized in that: The charging state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g) has at least one redistribution resistor (48e), which is configured to distribute the power drop within the charging state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g), wherein the redistribution resistor (48e) is arranged between the display element (28a; 28b; 28c; 28d; 28e; 28f, 52f; 28g, 52g) and the transistor element (30a; 54g; 54f) of the charging state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g).
6. The display device according to claim 1, characterized in that: The control unit (16a; 16b; 16c; 16d; 16e; 16f; 16g) is designed as a main control electronics unit for the battery pack.
7. The display device according to claim 1, characterized in that: The control unit is structurally separated from the charging state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g).
8. The display device according to claim 3, characterized in that: The control unit (16a; 16b; 16c; 16d; 16e; 16f; 16g) is designed as a main control electronics unit for the battery pack.
9. A battery pack for an electric tool, the battery pack having at least one control unit (16a; 16b; 16c; 16d; 16e; 16f; 16g) and at least one display device (14a; 14b; 14c; 14d; 14e; 14f; 14g) according to any one of claims 1 to 8.
10. The battery pack according to claim 9, wherein: The control unit (16a; 16b; 16c; 16d; 16e; 16f; 16g) is designed as a main control electronics unit for the battery pack.
11. A method for displaying the charge state of a battery pack of a power tool by means of at least one display device according to any one of claims 1 to 8, wherein: In at least one method step (42a), at least one display element (28a; 28b; 28c; 28d; 28e; 28f, 52f; 28g, 52g) of the charge status display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g) is short-circuited based on an electrical signal and / or an electronic signal transmitted by a control unit (16a; 16b; 16c; 16d; 16e; 16f; 16g) of the battery pack (12a; 12b; 12c; 12d; 12e; 12f; 12g) via a control line (20a; 20b; 20c; 20d; 20e; 20f; 20g), the control unit being short-circuited relative to the charge status display unit (18a; 18b; 18c ; 18d; 18e; 18f; 18g), the electrical signal and / or electronic signal depending on the charge state of the battery pack (12a; 12b; 12c; 12d; 12e; 12f; 12g), characterized in that in at least one method step (44a), at least one or more different electrical signals and / or electronic signals for controlling the charge state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g) are generated by at least two voltage levels of a control unit (16a; 16b; 16c; 16d; 16e; 16f; 16g) of the battery pack (12a; 12b; 12c; 12d; 12e; 12f; 12g) with the aid of at least two control resistors (32a).
12. The method according to claim 11, wherein: The control unit (16a; 16b; 16c; 16d; 16e; 16f; 16g) is designed as a main control electronics unit for the battery pack.
13. The method according to claim 11, wherein: The control unit is structurally separated from the charging state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g).
14. The method according to claim 11, characterized in that The short circuit of the display element (28a; 28b; 28c; 28d; 28e; 28f; 28g, 52f; 28g, 52g) is carried out by at least one transistor element (30a; 54g; 54f) of the charge status display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g), and the transistor element is connected according to the electrical signal and / or electronic signal of the control unit (16a; 16b; 16c; 16d; 16e; 16f; 16g) of the battery pack (12a; 12b; 12c; 12d; 12e; 12f; 12g).
15. The method according to claim 11, characterized in that The charging state display unit (18a; 18b; 18c; 18d; 18e; 18f; 18g) is supplied with current by means of at least one group voltage of the battery pack (12a; 12b; 12c; 12d; 12e; 12f; 12g) via at least one supply line (22a; 22b; 22c; 22d; 22e; 22f; 22g).