EP2904686A2 - Procédé et dispositif pour protéger un accumulateur d'une machine-outil portative de la décharge complète - Google Patents

Procédé et dispositif pour protéger un accumulateur d'une machine-outil portative de la décharge complète

Info

Publication number
EP2904686A2
EP2904686A2 EP13776447.8A EP13776447A EP2904686A2 EP 2904686 A2 EP2904686 A2 EP 2904686A2 EP 13776447 A EP13776447 A EP 13776447A EP 2904686 A2 EP2904686 A2 EP 2904686A2
Authority
EP
European Patent Office
Prior art keywords
power tool
duty cycle
average duty
discharge protection
determined
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13776447.8A
Other languages
German (de)
English (en)
Inventor
Thomas Müller
Michael Brandner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP2904686A2 publication Critical patent/EP2904686A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
    • H02H3/243—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for DC systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/63—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements against overdischarge
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/855—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/90—Regulation of charging or discharging current or voltage
    • H02J7/96—Regulation of charging or discharging current or voltage in response to battery voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/663—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements using battery or load disconnect circuits

Definitions

  • the present invention relates to a method and a device for deep discharge protection of a battery of a hand tool.
  • a power supply of hand tool machines is increasingly provided by accumulators, e.g. Lithium-ion batteries.
  • accumulators e.g. Lithium-ion batteries.
  • a shutdown occurs when a certain threshold voltage is exceeded for a predetermined reference duration.
  • accumulators should be universally usable for the various hand tool machines.
  • each user shows his own application behavior. The shutdown after the predetermined reference period is therefore not always optimal.
  • the inventive method for deep discharge protection of a battery of a power tool includes the following steps: determining a current average duty cycle of the power tool and setting a reference duration for the deep discharge protection of the battery as a function of the determined average duty cycle of the power tool.
  • determining a current average duty cycle of the power tool and setting a reference duration for the deep discharge protection of the battery as a function of the determined average duty cycle of the power tool is realized, which adapts to the user behavior and a current application of the power tool and thus optimizes the machine behavior of the power tool user and application specific.
  • an improved protection of the power tool is achieved because a deep discharge for a variety of applications of the power tool is reliably prevented.
  • the method further comprises turning off the power tool when a time duration of a falling below a certain limit voltage of the accumulator is greater than the predetermined reference duration.
  • the reference duration is set to a value smaller than the determined average duty cycle of the handheld power tool.
  • the specified reference duration is in a suitable ratio to the determined average duty cycle of the power tool, so that in addition to an optimized deep discharge protection optimized with respect to the user behavior and the current application machine behavior is achieved.
  • the reference duration is set to a value between 50% and 90% of the determined mean duty cycle of the handheld power tool.
  • the range of 50% to 90% of the average duty cycle determined represents a particularly advantageous range of values with regard to optimized deep discharge protection and simultaneously optimized machine behavior.
  • the reference duration is set to a value less than a maximum permitted reference duration and greater than a minimum permitted reference duration.
  • the determined average duty cycle of the handheld power tool is stored as a last determined average duty cycle. The storage of the last determined average duty cycle allows further use for the following averaging.
  • the average switch-on duration of the handheld power tool is determined by averaging over at least two switch-on durations of the handheld power tool.
  • the average switch-on duration of the handheld power tool is determined by averaging over at least two switch-on durations of the hand-held power tool and the last determined average switch-on duration.
  • the average switch-on duration of the handheld power tool is determined over a defined operating period and / or taking into account a set number of switch-on operations of the handheld power tool.
  • the user behavior can also be taken into account over one or more defined operating periods, for example a working day, for optimized deep discharge protection.
  • switch-on durations can first be assigned a value for a reference duration, after which the averaging is then formed over these assigned values.
  • the reference duration at the time of a first switch-on to a starting value is set to be less than or equal to the maximum permitted reference duration and greater than or equal to the minimum permitted reference duration. In this way, it is possible to set a reference duration for the deep discharge protection of the accumulator already at the first switching on of the handheld power tool of the current operating period or the current sequence of turn-on operations. This represents the Initialization of the proposed method with a defined value for the reference duration.
  • a device for a deep discharge protection of a battery of a hand tool machine has a timer for determining a current average duty cycle of the power tool and a fixing means for establishing a reference duration for the deep discharge protection of the battery as a function of the determined average duty cycle of the power tool.
  • the respective means, the timekeeper and determination means can be implemented in terms of hardware and / or software technology.
  • the respective means may be designed as a device or as part of a device, for example as a computer or as a microprocessor.
  • the respective means may be designed as a computer program product, as a function, as a routine, as part of a program code or as an executable object.
  • the hand tool is in particular an electric hand tool, such as an electric screwdriver, a hand-held drill, a chisel hammer, a combination hammer, a cordless screwdriver, a drywall screwdriver, a Tangential impact wrench, a circular saw or a saber saw.
  • an electric hand tool such as an electric screwdriver, a hand-held drill, a chisel hammer, a combination hammer, a cordless screwdriver, a drywall screwdriver, a Tangential impact wrench, a circular saw or a saber saw.
  • Fig. 1 shows a hand tool
  • FIG. 2 is a schematic flow diagram of a method for deep discharge protection of a rechargeable battery of a handheld power tool. Identical or functionally identical elements are indicated by the same reference numerals in the figures, unless stated otherwise. EMBODIMENTS OF THE INVENTION
  • Fig. 1 shows an exemplary hand tool 200, e.g. an electric screwdriver.
  • the hand tool 200 has a tool holder 2, in which a tool 3 can be used or fastened.
  • the tools 3 are, for example, a screwdriver bit, a drill, a grinding wheel and a saw blade.
  • An electric motor 20 drives the tool holder 2, here by way of example about a working axis 4 rotating.
  • a drive train between the tool holder 2 and the electric motor 20 may include a spindle 5, a gear 6 and other components, e.g. a torque clutch, an eccentric included.
  • a user takes the hand tool 200 by pressing a button 7 in operation.
  • the button 7 is preferably arranged on a handle 8, with which the user can hold and guide the power tool 200.
  • a controller 10 provides power to the electric motor 20 in response to the actuation.
  • An exemplary power source of the handheld power tool 200 is a battery pack 201 (accumulator) having a plurality of secondary battery cells 41.
  • the controller 10 advantageously monitors the state of the battery pack 201. Among other things, the controller 10 terminates the operation of the handheld power tool 200 when the charge state of the battery pack 201 falls below a critical threshold value.
  • the controller 10 includes a monitoring device 210 for deep discharge protection.
  • the monitoring device 210 can interrogate sensor data of the battery pack 201, for example, the current cell voltage of the individual battery cells 41. If the cell voltage of one or more of the battery cells 41 for a reference duration falls below a threshold voltage, the deep discharge protection is triggered and the operation of the power tool 200 ends.
  • FIG. 2 shows a schematic flow diagram of a method for deep discharge protection of the accumulator 201 of the handheld power tool 200.
  • a determination 101 of a current average duty cycle of the handheld power tool 200 is carried out.
  • a reference time 102 is set for the deep discharge protection of the battery 201 as a function of the determined average duty cycle of the handheld power tool 200.
  • the reference duration is set a value less than the determined mean Duty cycle of the power tool 200 set, which is for example in a range between 50% and 90% of the determined average duty cycle of the power tool 200.
  • the range specifications depend, for example, on a minimum and maximum allowable reference duration, which result from technical specifications, for example for the electric motor 20 of the portable power tool 200.
  • the threshold voltage is variable depending on the flow and temperature.
  • the determined average duty cycle can be stored and used for further averaging. This is particularly advantageous if, for example, an averaging over power-up operations during a particular operating period, such as a working day to be executed. At the same time or alternatively, it is also possible to limit the averaging to a predetermined number of switch-on processes or to offset the results of a plurality of such averaging, for example by weighting one or more components of the calculation.
  • the shutdown 103 prevents further discharge of the accumulator 201 to protect the accumulator 201 from damage by total discharge.
  • FIG. 1 shows a schematic block diagram of the handheld power tool 200.
  • the handheld power tool 200 includes the monitoring device 210 as part of the handheld power tool 200.
  • the monitoring device 210 includes a timer 211 for determining the average duty cycle of the handheld power tool 200 and a setting means 212 for establishing the reference duration for the deep discharge protection of the accumulator 201 as a function of the determined average duty cycle of the portable power tool 200.
  • the monitoring device 210 is integrated in the accumulator 201.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne un procédé pour protéger un accumulateur d'une machine-outil portative de la décharge complète, le procédé consistant : à déterminer un temps de fonctionnement moyen courant de la machine-outil portative; et à établir un temps de référence pour la protection contre la décharge complète de l'accumulateur, en fonction du temps de fonctionnement moyen déterminé de la machine-outil portative.
EP13776447.8A 2012-10-08 2013-10-07 Procédé et dispositif pour protéger un accumulateur d'une machine-outil portative de la décharge complète Withdrawn EP2904686A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012218293.4A DE102012218293A1 (de) 2012-10-08 2012-10-08 Verfahren und Vorrichtung für einen Tiefentladeschutz eines Akkumulators einer Handwerkzeugmaschine
PCT/EP2013/070794 WO2014056828A2 (fr) 2012-10-08 2013-10-07 Procédé et dispositif pour protéger un accumulateur d'une machine-outil portative de la décharge complète

Publications (1)

Publication Number Publication Date
EP2904686A2 true EP2904686A2 (fr) 2015-08-12

Family

ID=49354639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13776447.8A Withdrawn EP2904686A2 (fr) 2012-10-08 2013-10-07 Procédé et dispositif pour protéger un accumulateur d'une machine-outil portative de la décharge complète

Country Status (6)

Country Link
US (1) US20150280468A1 (fr)
EP (1) EP2904686A2 (fr)
JP (1) JP2016501002A (fr)
CN (1) CN104782018A (fr)
DE (1) DE102012218293A1 (fr)
WO (1) WO2014056828A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015061370A1 (fr) 2013-10-21 2015-04-30 Milwaukee Electric Tool Corporation Adaptateur pour dispositifs d'outil électrique
EP4613432A1 (fr) 2016-06-24 2025-09-10 Black & Decker Inc. Schéma de commande pour faire fonctionner un outil électrique sans fil sur la base de la température de la batterie
DE102020211204A1 (de) 2020-09-07 2022-03-10 Robert Bosch Gesellschaft mit beschränkter Haftung Schaltvorrichtung, elektrischer Energiespeicher und Vorrichtung
PL247888B1 (pl) * 2023-09-27 2025-09-15 Politechnika Swietokrzyska Układ kontroli napięcia magazynu energii

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003164066A (ja) * 2001-11-21 2003-06-06 Hitachi Koki Co Ltd 電池パック
US8471532B2 (en) * 2002-11-22 2013-06-25 Milwaukee Electric Tool Corporation Battery pack
DE102008003484A1 (de) * 2008-01-08 2009-07-09 Marquardt Gmbh Elektrowerkzeug
DE102009000102A1 (de) * 2009-01-09 2010-07-15 Hilti Aktiengesellschaft Steuerungsverfahren für einen Akkumulator und eine Handwerkzeugmaschine
JP5614572B2 (ja) * 2010-02-02 2014-10-29 日立工機株式会社 電動工具及び電池パック
JP5724227B2 (ja) * 2010-06-30 2015-05-27 日立工機株式会社 電池パック及びそれを用いた電動工具
DE102010045550A1 (de) * 2010-09-16 2012-03-22 Festool Gmbh Steuerung und Verfahren für eine elektrische Hand-Werkzeugmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014056828A2 *

Also Published As

Publication number Publication date
WO2014056828A3 (fr) 2014-10-02
JP2016501002A (ja) 2016-01-14
DE102012218293A1 (de) 2014-04-10
CN104782018A (zh) 2015-07-15
US20150280468A1 (en) 2015-10-01
WO2014056828A2 (fr) 2014-04-17

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