JP2011211861A - Battery pack and power tool - Google Patents

Battery pack and power tool Download PDF

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Publication number
JP2011211861A
JP2011211861A JP2010078827A JP2010078827A JP2011211861A JP 2011211861 A JP2011211861 A JP 2011211861A JP 2010078827 A JP2010078827 A JP 2010078827A JP 2010078827 A JP2010078827 A JP 2010078827A JP 2011211861 A JP2011211861 A JP 2011211861A
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Prior art keywords
battery
motor
overcurrent
threshold value
secondary battery
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Japanese (ja)
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Shinji Watabe
伸二 渡部
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Koki Holdings Co Ltd
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Hitachi Koki Co Ltd
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Priority to JP2010078827A priority Critical patent/JP2011211861A/en
Priority to PCT/JP2011/058481 priority patent/WO2011122696A1/en
Publication of JP2011211861A publication Critical patent/JP2011211861A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising 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—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack wherein the motor and the secondary battery can be protected appropriately.SOLUTION: The battery pack 2 can be mounted on a power tool 1 equipped with a motor 12, and includes a battery cell 22a which supplies power to the motor 12, and a microcomputer 26 which controls the current flowing through the motor 12 based on the load information related to the motor 12, and the battery information related to the battery cell 22a.

Description

本発明は、モータ及び二次電池を適切に保護することのできる電池パック及び電動工具に関する。   The present invention relates to a battery pack and a power tool that can appropriately protect a motor and a secondary battery.

従来の電池パック及び電動工具は、二次電池の劣化を防止するために過電流又は過放電と判断した場合に、二次電池からモータへの電力供給を停止させている（例えば、特許文献１参照）。   Conventional battery packs and power tools stop the power supply from the secondary battery to the motor when it is determined as overcurrent or overdischarge to prevent the secondary battery from deteriorating (for example, Patent Document 1). reference).

特開２００９−９５１６２号公報JP 2009-95162 A

しかしながら、従来の電池パック及び電動工具では、過電流等の閾値が一定であったため、状況によっては過電流等の判断が遅くなり、その結果、二次電池を劣化させてしまうという問題が生じていた。また、過電流の閾値等は、二次電池の保護のみを考慮して設定され、モータの保護を考慮して設定されていたわけではなかった。   However, in conventional battery packs and power tools, the threshold value for overcurrent and the like is constant, so that the determination of overcurrent and the like is delayed depending on the situation, resulting in a problem that the secondary battery is deteriorated. It was. Further, the threshold value of the overcurrent is set only considering the protection of the secondary battery, and is not set considering the protection of the motor.

本発明は、斯かる実情に鑑み、モータ及び二次電池を適切に保護することのできる電池パック及び電動工具を提供しようとするものである。   In view of such circumstances, the present invention intends to provide a battery pack and an electric tool that can appropriately protect a motor and a secondary battery.

また、本発明は、モータを備えた電動工具に装着される電池パックであって、前記モータに電力を供給する二次電池と、前記モータに関する負荷情報及び前記二次電池に関する電池情報に基づき前記モータに流れる電流を制御する制御部と、を備えたことを特徴とする電池パックを提供している。   The present invention also provides a battery pack to be mounted on an electric tool including a motor, the secondary battery supplying power to the motor, the load information related to the motor, and the battery information related to the secondary battery. There is provided a battery pack comprising a control unit for controlling a current flowing through a motor.

このような構成によれば、モータ及び二次電池を適切に保護することが可能となる。   According to such a configuration, the motor and the secondary battery can be appropriately protected.

また、本発明の電池パックは、複数の過電流閾値を記憶した記憶部を更に備え、前記制御部は、前記負荷情報に対応する過電流閾値と前記電池情報に対応する過電流閾値のうち小さい方の過電流閾値を前記記憶部から選択し、前記二次電池に流れる電流が前記選択した過電流閾値以上となった場合に過電流と判断して前記二次電池から前記モータへの電力の供給を停止させることが好ましい。   The battery pack of the present invention further includes a storage unit that stores a plurality of overcurrent threshold values, and the control unit is smaller of an overcurrent threshold value corresponding to the load information and an overcurrent threshold value corresponding to the battery information. Is selected from the storage unit, and when the current flowing through the secondary battery becomes equal to or greater than the selected overcurrent threshold, the overcurrent threshold is determined to be an overcurrent and the electric power from the secondary battery to the motor is determined. It is preferable to stop the supply.

このような構成によれば、モータ及び二次電池をより適切に保護することが可能となる。   According to such a structure, it becomes possible to protect a motor and a secondary battery more appropriately.

また、本発明の電池パックは、複数の過放電閾値を記憶した記憶部を更に備え、前記制御部は、前記負荷情報に対応する過放電閾値と前記電池情報に対応する過放電閾値のうち大きい方の過放電閾値を前記記憶部から選択し、前記二次電池の電圧が前記選択した過放電閾値以下となった場合に過放電と判断して前記二次電池から前記モータへの電力の供給を停止させることが好ましい。   In addition, the battery pack of the present invention further includes a storage unit that stores a plurality of overdischarge threshold values, and the control unit is larger of an overdischarge threshold value corresponding to the load information and an overdischarge threshold value corresponding to the battery information. The overdischarge threshold value is selected from the storage unit, and when the voltage of the secondary battery becomes equal to or lower than the selected overdischarge threshold value, it is determined that the overdischarge is over and power is supplied from the secondary battery to the motor. Is preferably stopped.

このような構成によれば、モータ及び二次電池をより適切に保護することが可能となる。   According to such a structure, it becomes possible to protect a motor and a secondary battery more appropriately.

また、本発明の別の観点では、二次電池を備えた電池パックが装着される電動工具であって、前記二次電池からの電力により駆動されるモータと、前記モータに関する負荷情報及び前記二次電池に関する電池情報に基づき前記モータに流れる電流を制御する制御部と、を備えたことを特徴とする電動工具を提供している。   According to another aspect of the present invention, there is provided an electric tool to which a battery pack including a secondary battery is mounted, the motor being driven by power from the secondary battery, load information regarding the motor, and the secondary battery. There is provided a power tool comprising: a control unit that controls a current flowing through the motor based on battery information relating to a secondary battery.

このような構成によれば、モータ及び二次電池を適切に保護することが可能となる。   According to such a configuration, the motor and the secondary battery can be appropriately protected.

また、本発明の電動工具は、複数の過電流閾値を記憶した記憶部を更に備え、前記制御部は、前記負荷情報に対応する過電流閾値と前記電池情報に対応する過電流閾値のうち小さい方の過電流閾値を前記記憶部から選択し、前記二次電池に流れる電流が前記選択した過電流閾値以上となった場合に過電流と判断して前記二次電池から前記モータへの電力の供給を停止させることが好ましい。   The power tool of the present invention further includes a storage unit that stores a plurality of overcurrent threshold values, and the control unit is smaller of an overcurrent threshold value corresponding to the load information and an overcurrent threshold value corresponding to the battery information. Is selected from the storage unit, and when the current flowing through the secondary battery becomes equal to or greater than the selected overcurrent threshold, the overcurrent threshold is determined to be an overcurrent and the electric power from the secondary battery to the motor is determined. It is preferable to stop the supply.

このような構成によれば、モータ及び二次電池をより適切に保護することが可能となる。   According to such a structure, it becomes possible to protect a motor and a secondary battery more appropriately.

また、本発明の電動工具は、複数の過放電閾値を記憶した記憶部を更に備え、前記制御部は、前記負荷情報に対応する過放電閾値と前記電池情報に対応する過放電閾値のうち大きい方の過放電閾値を前記記憶部から選択し、前記二次電池の電圧が前記選択した過放電閾値以下となった場合に過放電と判断して前記二次電池から前記モータへの電力の供給を停止させることが好ましい。   The power tool of the present invention further includes a storage unit that stores a plurality of overdischarge threshold values, and the control unit is larger of an overdischarge threshold value corresponding to the load information and an overdischarge threshold value corresponding to the battery information. The overdischarge threshold value is selected from the storage unit, and when the voltage of the secondary battery becomes equal to or lower than the selected overdischarge threshold value, it is determined that the overdischarge is over and power is supplied from the secondary battery to the motor. Is preferably stopped.

このような構成によれば、モータ及び二次電池をより適切に保護することが可能となる。   According to such a structure, it becomes possible to protect a motor and a secondary battery more appropriately.

本発明の電池パック及び電動工具によれば、モータ及び二次電池を適切に保護することが可能となる。   According to the battery pack and the electric tool of the present invention, it is possible to appropriately protect the motor and the secondary battery.

本発明の実施の形態に係る電動工具及び電池パックの断面図Sectional drawing of the electric tool and battery pack which concern on embodiment of this invention 本発明の実施の形態に係る電動工具及び電池パックの回路図Circuit diagram of electric power tool and battery pack according to embodiments of the present invention

以下、本発明の実施の形態を図１及び図２を参照して説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.

図１は、本発明の一実施形態に係る電動工具１及び電池パック２の断面図であり、図２は、電動工具１及び電池パック２の回路図である。   FIG. 1 is a cross-sectional view of an electric tool 1 and a battery pack 2 according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of the electric tool 1 and the battery pack 2.

電動工具１は、一対の工具側端子１１と、モータ１２と、トリガスイッチ１３と、スイッチング素子１４と、チャック１５と、機構部１６と、工具側メモリ１７と、を備えている。電池パック２は、一対の電池側端子２１と、電池組２２と、電圧検出部２３と、温度検出部２４と、電流検出部２５と、マイコン２６と、放電停止信号出力部２７と、充電停止信号出力部２８と、を備えている。図２に示すように、電動工具１と電池パック２とは、工具側端子１１及び電池側端子２１を介して着脱可能に接続される。   The electric tool 1 includes a pair of tool-side terminals 11, a motor 12, a trigger switch 13, a switching element 14, a chuck 15, a mechanism unit 16, and a tool-side memory 17. The battery pack 2 includes a pair of battery side terminals 21, a battery set 22, a voltage detection unit 23, a temperature detection unit 24, a current detection unit 25, a microcomputer 26, a discharge stop signal output unit 27, and a charge stop. And a signal output unit 28. As shown in FIG. 2, the electric power tool 1 and the battery pack 2 are detachably connected via the tool side terminal 11 and the battery side terminal 21.

まず、電動工具１の構成について説明する。モータ１２は、トリガスイッチ１３及びスイッチング素子１４を介して工具側端子１１に接続されており、ユーザの操作によりトリガスイッチ１３がオンされると駆動される。チャック１５は、図示しない先端工具を着脱可能に把持し、機構部１６は、モータ１２の動力をチャック１５に伝達する。工具側メモリ１７には、モータ１２に関する負荷情報が記憶されており、負荷情報は、電池パック２のマイコン２６に出力される。負荷情報については後述する。   First, the configuration of the electric power tool 1 will be described. The motor 12 is connected to the tool side terminal 11 via the trigger switch 13 and the switching element 14, and is driven when the trigger switch 13 is turned on by a user operation. The chuck 15 detachably holds a tip tool (not shown), and the mechanism 16 transmits the power of the motor 12 to the chuck 15. The tool-side memory 17 stores load information regarding the motor 12, and the load information is output to the microcomputer 26 of the battery pack 2. The load information will be described later.

次に、電池パック２の構成について説明する。電池組２２は、複数の電池セル（二次電池）２２ａを直列に接続した構成となっており、電池セル２２ａとしては、例えば、ニッケルカドミウム電池（以下、ニカド電池）、ニッケル水素電池、又は、リチウムイオン電池等の二次電池が考えられる。   Next, the configuration of the battery pack 2 will be described. The battery set 22 has a configuration in which a plurality of battery cells (secondary batteries) 22a are connected in series. As the battery cell 22a, for example, a nickel cadmium battery (hereinafter referred to as a nickel cadmium battery), a nickel hydrogen battery, or A secondary battery such as a lithium ion battery is conceivable.

電圧検出部２３は、電池組２２の電池電圧を検出し、マイコン２６に出力する。温度検出部２４は、電池組２２に近接して配置されており、電池組２２の電池温度を検出し、マイコン２６に出力する。電流検出部２５は、モータ１２に流れている電流を検出し、マイコン２６に出力する。   The voltage detector 23 detects the battery voltage of the battery set 22 and outputs it to the microcomputer 26. The temperature detection unit 24 is disposed in the vicinity of the battery set 22, detects the battery temperature of the battery set 22, and outputs it to the microcomputer 26. The current detection unit 25 detects the current flowing through the motor 12 and outputs it to the microcomputer 26.

マイコン２６は、電池側メモリ２６ａを備えており、電池側メモリ２６ａには、電池セル２２ａの電池特性が記憶されている。また、電池側メモリ２６ａには、複数の過電流閾値及び複数の過放電閾値が記憶されている。   The microcomputer 26 includes a battery-side memory 26a, and battery characteristics of the battery cell 22a are stored in the battery-side memory 26a. The battery-side memory 26a stores a plurality of overcurrent threshold values and a plurality of overdischarge threshold values.

マイコン２６は、過電流又は過放電を判別した場合に放電停止信号出力部２７より放電停止信号を出力してスイッチング素子１４をオフさせ、放電を停止させる。また、電動工具１の替わりに図示しない充電器が接続されている状態で過充電を検出した場合には充電停止信号出力部２８より充電停止信号を出力し、充電器による充電を停止させる。   When the microcomputer 26 determines overcurrent or overdischarge, the microcomputer 26 outputs a discharge stop signal from the discharge stop signal output unit 27 to turn off the switching element 14 and stop the discharge. In addition, when overcharge is detected in a state where a charger (not shown) is connected instead of the electric tool 1, a charge stop signal is output from the charge stop signal output unit 28, and charging by the charger is stopped.

次に、電池側メモリ２６ａに記憶されている過電流閾値及び過放電閾値について詳細に説明する。   Next, the overcurrent threshold and the overdischarge threshold stored in the battery side memory 26a will be described in detail.

本実施の形態では、マイコン２６は、電池側メモリ２６ａに記憶された複数の過電流閾値から負荷情報に対応する過電流閾値及び電池情報に対応する過電流閾値を抽出し、抽出した過電流閾値のうち小さい方の過電流閾値を選択する。そして、電流検出部２５によって検出された電流が選択した過電流閾値以上となった場合に過電流と判断して放電停止信号出力部２７より放電停止信号を出力する。   In the present embodiment, the microcomputer 26 extracts the overcurrent threshold corresponding to the load information and the overcurrent threshold corresponding to the battery information from the plurality of overcurrent thresholds stored in the battery-side memory 26a, and extracts the extracted overcurrent threshold. The smaller overcurrent threshold is selected. Then, when the current detected by the current detection unit 25 is equal to or greater than the selected overcurrent threshold, it is determined as an overcurrent and a discharge stop signal output unit 27 outputs a discharge stop signal.

また、マイコン２６は、電池側メモリ２６ａに記憶された複数の過放電閾値から負荷情報に対応する過放電閾値及び電池情報に対応する過放電閾値を抽出し、抽出した過放電閾値のうち大きい方の過放電閾値を選択する。そして、電圧検出部２３によって検出された電圧が選択した過放電閾値以下となった場合に過放電と判断して放電停止信号出力部２７より放電停止信号を出力する。   The microcomputer 26 extracts an overdischarge threshold corresponding to the load information and an overdischarge threshold corresponding to the battery information from a plurality of overdischarge thresholds stored in the battery-side memory 26a, and the larger one of the extracted overdischarge thresholds. Select the overdischarge threshold. Then, when the voltage detected by the voltage detector 23 is equal to or lower than the selected overdischarge threshold, it is determined that overdischarge occurs, and the discharge stop signal output unit 27 outputs a discharge stop signal.

続いて、マイコン２６による過電流閾値及び過放電閾値の抽出及び選択についてより詳細に説明する。   Next, the extraction and selection of the overcurrent threshold and the overdischarge threshold by the microcomputer 26 will be described in more detail.

まず、負荷情報に対応する過電流閾値について考えると、負荷情報としては、例えば、モータ１２の定格電流が考えられ、マイコン２６は、定格負荷電流が小さい場合には小さな過電流閾値を抽出し、定格負荷電流が大きい場合には大きな過電流閾値を抽出する。   First, considering the overcurrent threshold corresponding to the load information, for example, the load current may be the rated current of the motor 12, and the microcomputer 26 extracts a small overcurrent threshold when the rated load current is small, When the rated load current is large, a large overcurrent threshold is extracted.

次に、電池情報に対応する過電流閾値について考える。電池情報としては、例えば、電池特性及び電池状態が考えられ、電池特性の具体例としては、電池セルメーカ（内部抵抗）及び電池の種類（定格電圧）が考えられ、電池状態の具体例としては、電池電圧及び電池温度（内部抵抗）が考えられる。   Next, the overcurrent threshold corresponding to the battery information is considered. Examples of battery information include battery characteristics and battery status. Specific examples of battery characteristics include battery cell manufacturer (internal resistance) and battery type (rated voltage). Specific examples of battery status include Battery voltage and battery temperature (internal resistance) can be considered.

電池特性のうち、電池セルメーカについて考えると、一般に、電池セルは、電流が流れるとその内部抵抗によって発熱するが、発熱量が大きくなると破損の虞もある。そして、発熱量は内部抵抗の大きさと電流の大きさに依存しており、内部抵抗は、電池セルの製造メーカによって異なる。従って、マイコン２６は、電池セル２２ａの内部抵抗が大きい場合には小さな過電流閾値を抽出し、電池セル２２ａの内部抵抗が小さい場合には大きな過電流閾値を抽出する。   Considering a battery cell manufacturer among battery characteristics, generally, a battery cell generates heat due to its internal resistance when a current flows, but there is a risk of damage when the amount of generated heat increases. The amount of heat generated depends on the magnitude of the internal resistance and the magnitude of the current, and the internal resistance varies depending on the battery cell manufacturer. Accordingly, the microcomputer 26 extracts a small overcurrent threshold when the internal resistance of the battery cell 22a is large, and extracts a large overcurrent threshold when the internal resistance of the battery cell 22a is small.

電池特性のうち、電池の種類について考えると、電池セルが有する定格電圧は、その種類によって異なり、定格電圧が高いほど大きな電流を流すことができる。従って、マイコン２６は、電池セル２２ａの定格電圧が高い場合（例えば、リチウム電池の場合、３．６Ｖ）には大きな過電流閾値を抽出し、電池セル２２ａの定格電圧が低い場合（例えば、ニカド、ニッケル水素電池の場合、１．２Ｖ）には小さな過電流閾値を抽出する。   Of the battery characteristics, when considering the type of battery, the rated voltage of the battery cell varies depending on the type, and a larger current can flow as the rated voltage is higher. Accordingly, the microcomputer 26 extracts a large overcurrent threshold when the rated voltage of the battery cell 22a is high (for example, 3.6V in the case of a lithium battery), and when the rated voltage of the battery cell 22a is low (for example, NiCd). In the case of a nickel metal hydride battery, a small overcurrent threshold is extracted for 1.2V).

電池状態のうち、電池電圧について考えると、電池電圧が高い場合にも、内部抵抗によって生じる発熱量は大きくなる。従って、マイコン２６は、電池電圧が高い場合には小さな過電流閾値を抽出し、電池電圧が低い場合には大きな過電流閾値を抽出する。   Considering the battery voltage among the battery states, even when the battery voltage is high, the amount of heat generated by the internal resistance increases. Accordingly, the microcomputer 26 extracts a small overcurrent threshold when the battery voltage is high, and extracts a large overcurrent threshold when the battery voltage is low.

電池状態のうち、電池温度について考えると、電池セルは、低温では内部抵抗が大きいため、大きな電流を流すと大きく発熱する虞があり、一方、高温では電池セル自体の温度が高いため、この場合も大きく発熱する虞がある。従って、マイコン２６は、電池温度が適正範囲内の場合には大きな過電流閾値を抽出し、電池温度が適正範囲外の場合には小さな過電流閾値を抽出する。   Considering the battery temperature among the battery states, the battery cell has a large internal resistance at low temperatures, so there is a risk of large heat generation when a large current is passed. On the other hand, the temperature of the battery cell itself is high at high temperatures. However, there is a risk of heat generation. Therefore, the microcomputer 26 extracts a large overcurrent threshold when the battery temperature is within the proper range, and extracts a small overcurrent threshold when the battery temperature is outside the proper range.

そして、マイコン２６は、以上のようにして抽出された過電流閾値のうち最も小さい過電流閾値を選択し、電流検出部２５によって検出された電流が選択した過電流閾値以上となった場合に過電流と判断して放電停止信号出力部２７より放電停止信号を出力する。   Then, the microcomputer 26 selects the smallest overcurrent threshold among the overcurrent thresholds extracted as described above, and when the current detected by the current detection unit 25 becomes equal to or greater than the selected overcurrent threshold. The discharge stop signal is output from the discharge stop signal output unit 27 by determining that the current is current.

以上より、電池セル２２ａよりもモータ１２（負荷）の保護を優先させる場合には負荷情報に対応する過電流閾値が選択され、モータ１２（負荷）よりも電池セル２２ａの保護を優先させる場合には電池情報に対応する過電流閾値が選択されることとなる。   As described above, when priority is given to protection of the motor 12 (load) over the battery cell 22a, an overcurrent threshold corresponding to the load information is selected, and priority is given to protection of the battery cell 22a over the motor 12 (load). The overcurrent threshold corresponding to the battery information is selected.

例えば、定格負荷電流が小さい場合には負荷情報に対応する過電流閾値が選択されるものと考えられ、この場合には、ライトのような１Ａに満たない負荷の短絡等の異常時に確実に放電を停止させることができる。また、定格負荷電流が大きい場合には電池情報に対応する過電流閾値が選択されるものと考えられ、この場合には、電池セル２２ａの劣化を防止することができる。   For example, when the rated load current is small, it is considered that the overcurrent threshold corresponding to the load information is selected. In this case, the discharge is surely performed in the case of an abnormality such as a short circuit of a load that is less than 1A such as a light. Can be stopped. In addition, when the rated load current is large, it is considered that the overcurrent threshold corresponding to the battery information is selected. In this case, it is possible to prevent the deterioration of the battery cell 22a.

過放電閾値については過電流閾値の場合と逆の思想により抽出及び選択される。   The overdischarge threshold is extracted and selected based on the opposite idea to the overcurrent threshold.

すなわち、マイコン２６は、定格負荷電流が小さい場合には大きな過放電閾値を抽出し、定格負荷電流が大きい場合には小さな過放電閾値を抽出する。また、電池セル２２ａの内部抵抗が大きい場合には大きな過放電閾値を抽出し、電池セル２２ａの内部抵抗が小さい場合には小さな過放電閾値を抽出する。また、電池セル２２ａの定格電圧が高い場合には小さな過放電閾値を抽出し、電池セル２２ａの定格電圧が低い場合には大きな過放電閾値を抽出する。また、電池電圧が高い場合には大きな過放電閾値を抽出し、電池電圧が低い場合には小さな過放電閾値を抽出する。また、電池温度が適正範囲内の場合には小さな過放電閾値を抽出し、電池温度が適正範囲外の場合には大きな過放電閾値を抽出する。   That is, the microcomputer 26 extracts a large overdischarge threshold when the rated load current is small, and extracts a small overdischarge threshold when the rated load current is large. Further, when the internal resistance of the battery cell 22a is large, a large overdischarge threshold is extracted, and when the internal resistance of the battery cell 22a is small, a small overdischarge threshold is extracted. Further, when the rated voltage of the battery cell 22a is high, a small overdischarge threshold is extracted, and when the rated voltage of the battery cell 22a is low, a large overdischarge threshold is extracted. Further, when the battery voltage is high, a large overdischarge threshold is extracted, and when the battery voltage is low, a small overdischarge threshold is extracted. A small overdischarge threshold is extracted when the battery temperature is within the appropriate range, and a large overdischarge threshold is extracted when the battery temperature is outside the appropriate range.

そして、マイコン２６は、以上のようにして抽出された過放電閾値のうち最も大きい過放電閾値を選択し、電圧検出部２３によって検出された電圧が選択した過放電閾値以下となった場合に過放電と判断して放電停止信号出力部２７より放電停止信号を出力する。   Then, the microcomputer 26 selects the largest overdischarge threshold value among the overdischarge threshold values extracted as described above, and when the voltage detected by the voltage detection unit 23 is less than or equal to the selected overdischarge threshold value, A discharge stop signal is output from the discharge stop signal output unit 27 by determining that the discharge has occurred.

このように、本実施の形態による電動工具１及び電池パック２では、負荷情報及び電池情報に基づきモータに流れる電流を制御するので、モータ１２（負荷）及び電池セル２２ａを適切に保護することが可能となる。   As described above, in the electric power tool 1 and the battery pack 2 according to the present embodiment, since the current flowing through the motor is controlled based on the load information and the battery information, the motor 12 (load) and the battery cell 22a can be appropriately protected. It becomes possible.

また、本実施の形態による電動工具１及び電池パック２では、負荷情報に対応する過電流閾値と電池情報に対応する過電流閾値のうち小さい方の過電流閾値を記憶部から選択するので、モータ１２（負荷）及び電池セル２２ａをより適切に保護することが可能となる。   Moreover, in the electric tool 1 and the battery pack 2 according to the present embodiment, the smaller overcurrent threshold is selected from the storage unit among the overcurrent threshold corresponding to the load information and the overcurrent threshold corresponding to the battery information. 12 (load) and the battery cell 22a can be more appropriately protected.

また、本実施の形態による電動工具１及び電池パック２では、負荷情報に対応する過放電閾値と電池情報に対応する過放電閾値のうち大きい方の過放電閾値を記憶部から選択するので、モータ１２（負荷）及び電池セル２２ａをより適切に保護することが可能となる。   Moreover, in the electric tool 1 and the battery pack 2 according to the present embodiment, the larger overdischarge threshold value is selected from the storage unit among the overdischarge threshold value corresponding to the load information and the overdischarge threshold value corresponding to the battery information. 12 (load) and the battery cell 22a can be more appropriately protected.

なお、本発明による電動工具１及び電池パック２は、上述した実施の形態に限定されず、特許請求の範囲に記載した範囲で種々の変形や改良が可能である。   The electric power tool 1 and the battery pack 2 according to the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims.

例えば、マイコン２６は、過電流閾値及び過放電閾値以外にも、負荷情報及び電池情報に基づいてモータ１２に流れる電流を制御してもよい。その場合、基本的にはモータ１２に流れる電流を定格負荷電流と一致させるように制御し、例えば、電池温度が適正範囲外となった場合にモータ１２に流れる電流を下げる等の制御が考えられる。   For example, the microcomputer 26 may control the current flowing through the motor 12 based on load information and battery information other than the overcurrent threshold and the overdischarge threshold. In that case, control is basically performed so that the current flowing through the motor 12 matches the rated load current. For example, when the battery temperature is out of the proper range, the current flowing through the motor 12 is reduced. .

また、上記実施の形態では、抽出した過電流閾値のうち最も小さい過電流閾値を選択し、抽出した過放電閾値のうち最も大きい過放電閾値を選択したが、それらの平均値を採用してもよい。   Further, in the above embodiment, the smallest overcurrent threshold is selected from among the extracted overcurrent thresholds, and the largest overdischarge threshold is selected from among the extracted overdischarge thresholds. Good.

また、電池セル２２ａは、使用回数（充電回数）が増えると内部抵抗が増加するので、電池状態として使用回数を考慮に入れてもよい。   Further, since the internal resistance of the battery cell 22a increases as the number of times of use (number of times of charge) increases, the number of times of use may be taken into consideration as the battery state.

また、電動工具１の継続使用時間に比例して電池温度も増加するので、電池温度の代わりに継続使用時間を電池状態として考慮に入れてもよい。   Further, since the battery temperature increases in proportion to the continuous use time of the electric power tool 1, the continuous use time may be taken into consideration as the battery state instead of the battery temperature.

また、上記実施の形態では、マイコン２６は、電池パック２側に設けられていたが、電動工具１側に設けられてもよい。   Moreover, in the said embodiment, although the microcomputer 26 was provided in the battery pack 2 side, you may provide in the electric tool 1 side.

１ 電動工具
２ 電池パック
１２ モータ
２２ａ 電池セル
２３ 電圧検出部
２４ 温度検出部
２５ 電流検出部
２６ マイコン
２６ａ 電池側メモリ
２６ａ メモリ DESCRIPTION OF SYMBOLS 1 Electric tool 2 Battery pack 12 Motor 22a Battery cell 23 Voltage detection part 24 Temperature detection part 25 Current detection part 26 Microcomputer 26a Battery side memory 26a Memory

Claims (6)

モータを備えた電動工具に装着される電池パックであって、
前記モータに電力を供給する二次電池と、
前記モータに関する負荷情報及び前記二次電池に関する電池情報に基づき前記モータに流れる電流を制御する制御部と、
を備えたことを特徴とする電池パック。 A battery pack attached to an electric tool equipped with a motor,
A secondary battery for supplying power to the motor;
A control unit for controlling a current flowing in the motor based on load information on the motor and battery information on the secondary battery;
A battery pack comprising: 複数の過電流閾値を記憶した記憶部を更に備え、
前記制御部は、前記負荷情報に対応する過電流閾値と前記電池情報に対応する過電流閾値のうち小さい方の過電流閾値を前記記憶部から選択し、前記二次電池に流れる電流が前記選択した過電流閾値以上となった場合に過電流と判断して前記二次電池から前記モータへの電力の供給を停止させることを特徴とする請求項１に記載の電池パック。 A storage unit storing a plurality of overcurrent thresholds;
The control unit selects a smaller overcurrent threshold value from the storage unit among an overcurrent threshold value corresponding to the load information and an overcurrent threshold value corresponding to the battery information, and a current flowing through the secondary battery is selected. 2. The battery pack according to claim 1, wherein the battery pack is determined to be overcurrent when the overcurrent threshold is exceeded, and power supply from the secondary battery to the motor is stopped. 複数の過放電閾値を記憶した記憶部を更に備え、
前記制御部は、前記負荷情報に対応する過放電閾値と前記電池情報に対応する過放電閾値のうち大きい方の過放電閾値を前記記憶部から選択し、前記二次電池の電圧が前記選択した過放電閾値以下となった場合に過放電と判断して前記二次電池から前記モータへの電力の供給を停止させることを特徴とする請求項１又は２に記載の電池パック。 A storage unit that stores a plurality of overdischarge threshold values;
The control unit selects, from the storage unit, a larger overdischarge threshold value of the overdischarge threshold value corresponding to the load information and the overdischarge threshold value corresponding to the battery information, and the voltage of the secondary battery is selected. 3. The battery pack according to claim 1, wherein the battery pack is judged to be overdischarged when the overdischarge threshold value is reached or less, and the supply of electric power from the secondary battery to the motor is stopped. 二次電池を備えた電池パックが装着される電動工具であって、
前記二次電池からの電力により駆動されるモータと、
前記モータに関する負荷情報及び前記二次電池に関する電池情報に基づき前記モータに流れる電流を制御する制御部と、
を備えたことを特徴とする電動工具。 A power tool to which a battery pack including a secondary battery is attached,
A motor driven by power from the secondary battery;
A control unit for controlling a current flowing in the motor based on load information on the motor and battery information on the secondary battery;
An electric tool comprising: 複数の過電流閾値を記憶した記憶部を更に備え、
前記制御部は、前記負荷情報に対応する過電流閾値と前記電池情報に対応する過電流閾値のうち小さい方の過電流閾値を前記記憶部から選択し、前記二次電池に流れる電流が前記選択した過電流閾値以上となった場合に過電流と判断して前記二次電池から前記モータへの電力の供給を停止させることを特徴とする請求項４に記載の電動工具。 A storage unit storing a plurality of overcurrent thresholds;
The control unit selects a smaller overcurrent threshold value from the storage unit among an overcurrent threshold value corresponding to the load information and an overcurrent threshold value corresponding to the battery information, and a current flowing through the secondary battery is selected. The power tool according to claim 4, wherein when the overcurrent threshold is exceeded, the power is judged to be overcurrent and the supply of power from the secondary battery to the motor is stopped. 複数の過放電閾値を記憶した記憶部を更に備え、
前記制御部は、前記負荷情報に対応する過放電閾値と前記電池情報に対応する過放電閾値のうち大きい方の過放電閾値を前記記憶部から選択し、前記二次電池の電圧が前記選択した過放電閾値以下となった場合に過放電と判断して前記二次電池から前記モータへの電力の供給を停止させることを特徴とする請求項４又は５に記載の電動工具。 A storage unit that stores a plurality of overdischarge threshold values;
The control unit selects, from the storage unit, a larger overdischarge threshold value of the overdischarge threshold value corresponding to the load information and the overdischarge threshold value corresponding to the battery information, and the voltage of the secondary battery is selected. 6. The electric tool according to claim 4, wherein when it becomes equal to or lower than an overdischarge threshold, it is determined that the battery is overdischarged, and power supply from the secondary battery to the motor is stopped.
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