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JP6743443B2 - Battery pack and power tool - Google Patents
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JP6743443B2 - Battery pack and power tool - Google Patents

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JP6743443B2
JP6743443B2 JP2016060452A JP2016060452A JP6743443B2 JP 6743443 B2 JP6743443 B2 JP 6743443B2 JP 2016060452 A JP2016060452 A JP 2016060452A JP 2016060452 A JP2016060452 A JP 2016060452A JP 6743443 B2 JP6743443 B2 JP 6743443B2
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battery pack
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discharge
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鈴木 利幸
利幸 鈴木
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Koki Holdings Co Ltd
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    • YGENERAL 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
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    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Description

本発明は、複数の電池セルを有する電池セル組と、前記電池セル組を収納する外殻となる電池ケースとを備えた、コードレス電動工具等に使用する電池パック及びこれを備える電動工具に関する。 The present invention relates to a battery pack for use in a cordless power tool or the like, which includes a battery cell group having a plurality of battery cells and a battery case serving as an outer shell for housing the battery cell group, and an electric tool including the battery pack.

近年、電池パックを着脱自在に備えるコードレス電動工具が広く使用されるようになってきている。図7乃至図9を用いてコードレス電動工具の一例を説明する。図7は電池パック1A(それぞれ1個のみの正側放電端子及び負側放電端子を有するもの)の上側ケース部を外した状態の平面図、図8は電池パック1Aが装着されるコードレス電動工具本体70A(ここで、電動工具本体とは電動工具から電池パックを外した部分を言う)であって、その電池パック装着部80Aを示す電動工具本体底面側よりみた斜視図、図9は1個のみの正側放電端子を有する電池パック1Aに、1個のみの正側受電端子を有するコードレス電動工具本体70Aを接続した状態のブロック図である。 2. Description of the Related Art In recent years, cordless electric tools that have a battery pack detachably attached have been widely used. An example of the cordless power tool will be described with reference to FIGS. 7 to 9. 7 is a plan view of the battery pack 1A (each having only one positive side discharge terminal and one negative side discharge terminal) with the upper case removed, and FIG. 8 is a cordless power tool to which the battery pack 1A is mounted. A main body 70A (herein, the electric tool main body means a portion obtained by removing the battery pack from the electric tool), and a perspective view of the battery pack mounting portion 80A seen from the bottom surface side of the electric tool main body, and FIG. 9 shows one. It is a block diagram of the state where the cordless electric tool main body 70A having only one positive side power receiving terminal is connected to the battery pack 1A having only one positive side discharging terminal.

図7に示すように、電池パック1Aは複数の電池セルを有する電池セル組2と、電池セル組2を収納する電池ケース3と、電池セル組2上に載置固定される基板4と、基板4上に固着される端子群5と、防塵等のために基板4上に固定される基板カバー6とを有する。電池パック1Aでは、端子群5はそれぞれ1個のみの正側放電端子5P及び負側放電端子5Nと、制御信号端子(LD端子)5LDとを含んでいる。基板4には図9に示す電流検出抵抗41及び保護手段45が搭載されている。基板4に取り付けられた正側放電端子5Pは電流検出抵抗41を介して電池セル組2の正側電圧供給端に接続され、負側放電端子5Nは電池セル組2の負側電圧供給端に接続されている。保護手段45としては保護ICやマイクロコンピュータが考えられる。ここでは保護手段45としてマイクロコンピュータ(以下、「マイコン」という)を例に説明する。マイコン45で電流検出抵抗41の電圧降下を検知することで放電電流を検出している。 As shown in FIG. 7, the battery pack 1A includes a battery cell set 2 having a plurality of battery cells, a battery case 3 for housing the battery cell set 2, and a substrate 4 mounted and fixed on the battery cell set 2. It has a terminal group 5 fixed on the substrate 4 and a substrate cover 6 fixed on the substrate 4 for dustproof and the like. In the battery pack 1A, the terminal group 5 includes only one positive side discharge terminal 5P and one negative side discharge terminal 5N, and a control signal terminal (LD terminal) 5LD . On the substrate 4, the current detection resistor 41 and the protection means 45 shown in FIG. 9 are mounted. The positive side discharge terminal 5P attached to the substrate 4 is connected to the positive side voltage supply end of the battery cell set 2 via the current detection resistor 41, and the negative side discharge terminal 5N is connected to the negative side voltage supply end of the battery cell set 2. It is connected. As the protection means 45, a protection IC or a microcomputer can be considered. Here, a microcomputer (hereinafter referred to as "microcomputer") will be described as an example of the protection means 45. The microcomputer 45 detects the voltage drop of the current detection resistor 41 to detect the discharge current.

図8に示すコードレス電動工具本体70Aの電池パック装着部80Aは、電池パック1A側のそれぞれ1個の正側放電端子5P及び負側放電端子5Nに接続可能なそれぞれ1個のみの正側受電端子9P及び負側受電端子9Nを有するとともに、制御信号端子5LDに接続する制御信号端子9LDを有する。電池パック1Aの放電電流が、過電流であるとして放電を停止する過電流検知閾値に到達したことをマイコン45が検出した場合、マイコン45は電池パック1A側の制御信号端子5LDから所定の制御信号(放電禁止信号)をコードレス電動工具本体70Aの制御信号端子9LDに出力する。 The battery pack mounting portion 80A of the cordless power tool body 70A shown in FIG. 8 has only one positive side power receiving terminal connectable to each one positive side discharge terminal 5P and negative side discharge terminal 5N on the battery pack 1A side. 9P and the negative side power receiving terminal 9N, and also has a control signal terminal 9 LD connected to the control signal terminal 5 LD . When the microcomputer 45 detects that the discharge current of the battery pack 1A has reached the overcurrent detection threshold value for stopping the discharge because it is an overcurrent, the microcomputer 45 controls the battery pack 1A side from the control signal terminal 5 LD for a predetermined control. A signal (discharge prohibition signal) is output to the control signal terminal 9 LD of the cordless electric tool main body 70A.

図9に示すように、コードレス電動工具本体70Aは運転開始・停止、回転速度制御等を行うスイッチSW、マイコン71、FETを含むモータ駆動回路72、モータ駆動回路72で駆動されるモータM等を有している。過電流検知閾値に到達したことを示す制御信号が制御信号端子9LDを通してマイコン71に入力されると、マイコン71はモータ駆動回路72を介してモータMを停止する。 As shown in FIG. 9, the cordless electric tool main body 70A includes a switch SW for starting/stopping the operation, controlling the rotation speed, a microcomputer 71, a motor drive circuit 72 including an FET, a motor M driven by the motor drive circuit 72, and the like. Have When a control signal indicating that the overcurrent detection threshold value has been reached is input to the microcomputer 71 through the control signal terminal 9 LD , the microcomputer 71 stops the motor M via the motor drive circuit 72.

ところで、コードレス電動工具に用いられる電池パック内の電池セルは、18650タイプ(直径18mm、長さ65mm)のリチウムイオン電池が主流であるが、近年、高容量・高出力を目的として20650タイプ(直径20mm、長さ65mm)や21700タイプ(直径21mm、長さ70mm)など、セル径を太くすることや長さを大きくする傾向にある。これに伴い、飛躍的に高容量・高出力が可能になってきている。例えば、これまでの18650タイプは、1セルが容量1,300mAhから3,000mAh程度で定格放電電流は15Aから25A程度であったが、20650タイプや21700タイプは、容量3,000mAh程度で定格放電電流は30A程度となり将来は容量4,000mAh程度で定格放電電流は40A程度と大幅に性能が向上する可能性がある。これらの性能向上により、コードレス電動工具も商用電源使用のACコード付き電動工具に代われる分野が広がり、より高出力な製品が提供出来る様になる。 By the way, the battery cell in the battery pack used for the cordless power tool is mainly a 18650 type (diameter 18 mm, length 65 mm) lithium-ion battery. 20 mm, length 65 mm) and 21700 type (diameter 21 mm, length 70 mm) and the like tend to increase the cell diameter and length. Along with this, dramatically higher capacity and higher output have become possible. For example, the conventional 18650 type has a capacity of 1300mAh to 3,000mAh per cell and a rated discharge current of 15A to 25A. The current will be about 30 A, and in the future, the capacity will be about 4,000 mAh, and the rated discharge current will be about 40 A, which may greatly improve the performance. With these improvements in performance, the fields where cordless power tools will replace AC power tools with AC cords that use commercial power supply will expand, and it will be possible to provide higher output products.

電池パック及び電動工具の公知例としては、以下の特許文献1がある。 As a known example of the battery pack and the power tool, there is Patent Document 1 below.

特開2014−41742号公報JP, 2014-41742, A

これまで、コードレス電動工具に取り付け可能な電池パックは、製造メーカが同じであれば、完全に互換性がありユーザは工具を選ばずに電池パックを取り付ける事が可能であった。 Until now, battery packs that can be attached to cordless power tools are completely compatible if the manufacturers are the same, and the user can attach the battery packs without selecting the tool.

しかし、高容量・高出力な電池パックを新規に採用するにあたり、2つの問題点が生じる。1つは、電池パックの性能をフルに活用するために、電池パックから負荷(電動工具本体)に供給する放電電流が過電流になったときに放電を停止する過電流検知の閾値を上げることが考えられるが、コードレス電動工具のモータ駆動用FETの定格が低い事で、容易に変更できないことである。 However, two problems arise when a high-capacity, high-output battery pack is newly adopted. One is to raise the threshold of overcurrent detection that stops discharging when the discharge current supplied from the battery pack to the load (power tool body) becomes overcurrent in order to fully utilize the performance of the battery pack. However, it is not possible to change easily because the rating of the motor drive FET of the cordless power tool is low.

近年の電池セルは、高出力が可能なため、コードレス電動工具の出力向上が求められている。しかし、高出力でない電池セルを用いた電池パックを、高出力可能な電動工具に使用した場合、重負荷製品であるディスクグラインダや丸のこでは電池パック側の過電流保護機能又は電圧低下による過放電保護機能が働き、モータが停止してしまう問題がある。また、近年の電池セルを使用して電池パックの過電流検知閾値を上げた場合、既存のコードレス電動工具のモータ駆動用FETが定格オーバとなり破損することが考えられる。 Since battery cells in recent years are capable of high output, it is required to improve the output of cordless power tools. However, when a battery pack that uses battery cells that do not have high output is used in a power tool that can output high power, a heavy load product such as a disk grinder or circular saw will prevent the battery pack from overcurrent protection or overvoltage. There is a problem that the discharge protection function works and the motor stops. Further, when the battery cell of recent years is used to raise the overcurrent detection threshold of the battery pack, it is conceivable that the motor drive FET of the existing cordless electric tool will be overrated and damaged.

もう1つの問題点は、電池セルは内部抵抗を低下させる事で高出力を可能としているため、コードレス電動工具本体側において、電流を容易に引き出せることで、モータやモータ駆動用FET等の温度上昇によってコードレス電動工具が破損することである。 Another problem is that the battery cell enables high output by lowering the internal resistance, so that the current can be easily drawn on the cordless power tool body side, and the temperature rise of the motor and motor drive FET etc. The cordless power tool will be damaged by this.

これらの問題は、ディスクグラインダや丸のこなど高負荷状態で連続的に作業可能なコードレス電動工具で多く発生すると考えられる。これらの電動工具は作業用工具を切削対象に押し当てて使用するため、先端部の荷重により先端部の負荷が大きくなり回転数が下がるとモータ電流が大きくなる特性がある。これにより、先端部の速度が下がると同時にモータの回転速度も下がるため、モータ及びモータ駆動用FET周辺を冷却する風量が減るため、モータ及びモータ駆動用FET周辺が温度上昇し破損する。 It is considered that these problems often occur in a cordless power tool such as a disc grinder or a circular saw that can continuously work under a high load condition. Since these power tools are used by pressing a work tool against the object to be cut, the load on the tip increases the load on the tip and the motor current increases when the rotational speed decreases. As a result, the rotation speed of the motor decreases at the same time as the speed of the tip portion decreases, so the amount of air that cools around the motor and the FET for driving the motor decreases, and the temperature around the motor and the FET for driving the motor rises and is damaged.

高出力でない電池セルを用いた電池パックであれば、モータ電流の増加に伴い、電池パック電圧の電圧低下が発生し、過放電検知によりコードレス電動工具が停止したが、高容量・高出力電池セルでは、電池セルの内部抵抗が低く設定されているため、電池パック電圧の電圧低下が小さい上、さらにモータ電流を流すことが可能になり、さらにコードレス電動工具の破損が多くなると考えられる。 If the battery pack uses battery cells that are not of high output, the voltage of the battery pack voltage will drop as the motor current increases, and the cordless power tool will stop due to overdischarge detection. Since the internal resistance of the battery cell is set low, the voltage drop of the battery pack voltage is small, more motor current can be passed, and the cordless power tool is more likely to be damaged.

本発明はこうした状況を認識してなされたものであり、その目的は、電池セル組の正側及び負側電圧供給電極にそれぞれ接続される正側及び負側放電端子を備える電池パックにおいて、多様な電動工具についてその性能を引き出すことを可能にする電池パック及びその電池パックを備える電動工具を提供することにある。 The present invention has been made aware of this situation, and its object is Te battery pack odor with a positive and negative discharge terminal is connected to the positive and negative voltage supply electrode of the battery cell group, It is to provide a power tool including a battery pack and the battery pack makes it possible to bring out the performance for diverse power tool.

本発明の第1の態様は電池パックである。この電池パックは、複数の電池セルを有する電池セル組と、前記電池セル組を収納する電池ケースと、前記電池セル組の正側及び負側電圧供給端にそれぞれ接続する正側及び負側放電端子と、前記電池セル組からの放電電流が過電流検知閾値を超えると放電を停止するよう構成された制御部と、を備え、
前記制御部は、前記電池パックに接続された電動工具本体の種類に応じて前記過電流検知閾値を変更可能に構成されることを特徴とする。
A first aspect of the present invention is a battery pack. This battery pack includes a battery cell group having a plurality of battery cells, a battery case accommodating the battery cell group, and positive side and negative side discharges respectively connected to positive side and negative side voltage supply terminals of the battery cell set. A terminal, and a control unit configured to stop discharging when the discharge current from the battery cell set exceeds an overcurrent detection threshold value ,
The control unit is configured to be able to change the overcurrent detection threshold value according to the type of the power tool main body connected to the battery pack .

前記第1の態様において、前記正側及び負極放電端子の少なくとも一方を介して前記電池パックに接続された電動工具本体の種類を判別可能とするとよい。
前記正側及び負側放電端子の少なくとも一方は、複数個設けられているとよい。
記電動工具本体の種類の判別は、前記複数個設けられている前記正側及び負側放電端子の少なくとも一方を介して行うとよい。
数個設けられた端子の各端子に流れる電流を検出する電流検出手段を有するとよい。
In the first aspect, it is preferable that the type of the power tool main body connected to the battery pack can be discriminated via at least one of the positive side and the negative electrode discharge terminal.
A plurality of at least one of the positive side and negative side discharge terminals may be provided.
Determination of the kind of pre-SL tool body is preferably performed through at least one of the positive and negative discharge terminal are provided the plurality.
It may have a current detection means for detecting a current flowing through each terminal of the multi several provided the pin.

本発明の第2の態様は電池パックである。この電池パックは、複数の電池セルを有する電池セル組と、前記電池セル組を収納する電池ケースと、前記電池セル組の正側及び負側電圧供給端にそれぞれ接続する正側及び負側放電端子と、を備え、
前記正側及び負側放電端子の少なくとも一方は複数個設けられており、
前記複数個設けられた端子の各端子に流れる電流を検出する電流検出手段を有し、
前記電流検出手段の電流検出値は制御部に入力され、前記制御部は、過電流であるとして放電を停止する過電流検知閾値を、各端子の電流検出値に応じて変更可能としたことを特徴とする。
前記複数個設けられた端子は、実質的に同電位であるとよい。
A second aspect of the present invention is a battery pack. This battery pack includes a battery cell group having a plurality of battery cells, a battery case accommodating the battery cell group, and positive side and negative side discharges respectively connected to positive side and negative side voltage supply terminals of the battery cell set. And a terminal,
At least one of the positive side and negative side discharge terminals is provided in plurality,
A current detection means for detecting a current flowing through each of the plurality of terminals provided,
Current detection value of said current detecting means is inputted to the control unit, said control unit, the overcurrent detection threshold for stopping the discharge as an over-current, and can be changed in accordance with the current detection value of each pin Characterize.
The plurality of terminals may have substantially the same potential.

本発明の第の態様は電動工具である。この電動工具は、前記電池パックを、本体の電池パック装着部に着脱自在に装着することを特徴とする。 A third aspect of the present invention is an electric power tool. This electric power tool is characterized in that the battery pack is detachably mounted on a battery pack mounting portion of a main body.

本発明の第の態様において、前記電動工具は、前記正側又は負側放電端子のそれぞれに接続する受電端子を有するとよい。 In the third aspect of the present invention, the power tool may have a power receiving terminal connected to each of the positive side or negative side discharge terminals.

本発明の第の態様はシステムである。このシステムは、電池パック、第1の電動工具本体、及び、第2の電動工具本体を備え、
前記電池パックは、正側及び負側放電端子を有し、
前記第1の電動工具本体は、前記正側及び負側放電端子にそれぞれ接続される第1の本体側正側及び負側端子と、前記第1の本体側正側及び負側端子の少なくとも一方から分岐する分岐端子と、を有し、
前記第2の電動工具本体は、前記正側及び負側放電端子にそれぞれ接続される第2の本体側正側及び負側端子を有すると共に、前記分岐端子に相当する端子を有さず、
前記電池パックは、過電流であるとして放電を停止する過電流検知閾値を、前記分岐端子の有無に応じて変更可能としたことを特徴とする。
A fourth aspect of the invention is a system . The system includes a battery pack, a first power tool body, and a second power tool body,
The battery pack has positive and negative discharge terminals,
The first electric power tool main body has at least one of a first main body side positive side and a negative side terminal connected to the positive side and the negative side discharge terminals, and a first main body side positive side and a negative side terminal. A branch terminal that branches from,
The second power tool main body has second main body side positive side and negative side terminals connected to the positive side and negative side discharge terminals, respectively, and does not have terminals corresponding to the branch terminals,
The battery pack is characterized in that the overcurrent detection threshold value for stopping the discharge as an overcurrent can be changed according to the presence or absence of the branch terminal.

前記第態様において、前記電池パックは、前記分岐端子と接続されるパック側分岐端子を有するとよい。 In the fourth aspect, the battery pack may have a pack-side branch terminal connected to the branch terminal.

前記第態様において、前記電池パックは電池セルを有し、前記第1の電動工具本体はモータを有し、前記分岐端子及び前記パック側分岐端子は、前記電池セルと前記モータとの放電経路に設けられるとよい。 In the fourth aspect, the battery pack has a battery cell, the first power tool body has a motor, and the branch terminal and the pack-side branch terminal have a discharge path between the battery cell and the motor. It is good to be provided in.

なお、以上の構成要素の任意の組合せ、本発明の表現を方法やシステムなどの間で変換したものもまた、本発明の態様として有効である。 It should be noted that any combination of the above constituent elements and one obtained by converting the expression of the present invention between methods and systems are also effective as an aspect of the present invention.

本発明によれば、複数の電池セルを有する電池セル組を収納した電池パックにおいて、多様な電動工具についてその性能を引き出すことが可能である。また、従来の電池パックとの識別を容易に行うこともできる。 According to the present invention, Te battery pack odor accommodating the battery cell assembly having a plurality of battery cells, it is possible to derive the performance for diverse power tool. Further, it can be easily distinguished from the conventional battery pack.

本発明に係る電池パック及び電動工具の実施の形態であって、電池パックの全体構成を示す分解斜視図。1 is an embodiment of a battery pack and an electric tool according to the present invention, and is an exploded perspective view showing an overall configuration of the battery pack. 前記電池パックの上側ケース部を外した状態の平面図。The top view of the state which removed the upper side case part of the battery pack. 本発明の実施の形態において、前記電池パックが装着されるコードレス電動工具本体が備える電池パック装着部を示す電動工具本体底面側よりみた斜視図。In the embodiment of the present invention, a perspective view seen from the bottom side of the power tool body showing a battery pack mounting portion provided in the cordless power tool body to which the battery pack is mounted. 本発明の実施の形態において、複数の正側放電端子を有する電池パックに、複数の正側受電端子を有するコードレス電動工具本体を接続した状態のブロック図。In the embodiment of the present invention, a block diagram showing a state in which a cordless power tool body having a plurality of positive side power receiving terminals is connected to a battery pack having a plurality of positive side discharging terminals. 図4の場合以外の電池パックと電動工具本体の接続の組合せであって、(A)は実施の形態に示す電池パックの複数の正側放電端子の一方に、正側受電端子を1個のみ有するコードレス電動工具本体の前記正側受電端子を接続した状態のブロック図、(B)は実施の形態に示す電池パックの複数の正側放電端子の他方に、正側受電端子を1個のみ有するコードレス電動工具本体の前記正側受電端子を接続した状態のブロック図、(C)は電池パックの1個のみの正側放電端子に、正側受電端子を複数個有するコードレス電動工具のうちの1個の正側受電端子を接続した状態のブロック図。4 is a combination of connection of a battery pack and an electric tool main body other than the case of FIG. 4, (A) shows only one positive side power receiving terminal to one of a plurality of positive side discharge terminals of the battery pack shown in the embodiment. A block diagram of the cordless power tool body having the positive side power receiving terminal connected thereto, (B) has only one positive side power receiving terminal at the other of the plurality of positive side discharging terminals of the battery pack shown in the embodiment. A block diagram of the cordless power tool main body in which the positive side power receiving terminal is connected, (C) is one of the cordless power tools having a plurality of positive side power receiving terminals for only one positive side discharging terminal of the battery pack The block diagram of the state where the positive side power receiving terminal was connected. 本発明の実施の形態において、電池パックの過電流検知閾値の制御に関するフローチャート。3 is a flowchart regarding control of an overcurrent detection threshold value of a battery pack in the embodiment of the present invention. 1個のみの正側放電端子を有する電池パックの上側ケース部を外した状態の平面図。The top view of the state which removed the upper side case part of the battery pack which has only one positive side discharge terminal. コードレス電動工具本体(図7の電池パックに対応するもの)が備える電池パック装着部を示す電動工具本体底面側よりみた斜視図。The perspective view seen from the electric tool main body bottom side which shows the battery pack mounting part with which a cordless electric tool main body (one corresponding to the battery pack of FIG. 7) is provided. 1個のみの正側放電端子を有する電池パックに、1個のみの正側受電端子を有するコードレス電動工具を接続した状態のブロック図。The block diagram of the state which connected the cordless electric tool which has only one positive side electric power receiving terminal to the battery pack which has only one positive side discharge terminal. 本発明に係る変形例であって、複数の正側端子(一方が放電端子で他方が分岐端子)を有する電池パックに、複数の正側受電端子を有するコードレス電動工具本体を接続した状態のブロック図。In a modification according to the present invention, a block in a state in which a cordless power tool body having a plurality of positive side power receiving terminals is connected to a battery pack having a plurality of positive side terminals (one is a discharge terminal and the other is a branch terminal) Fig.

以下、図面を参照しながら本発明の好適な実施の形態を詳述する。なお、各図面に示される同一又は同等の構成要素、部材、処理等には同一の符号を付し、適宜重複した説明は省略する。また、実施の形態は発明を限定するものではなく例示であり、実施の形態に記述されるすべての特徴やその組み合わせは必ずしも発明の本質的なものであるとは限らない。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same or equivalent components, members, processes, and the like shown in each drawing are denoted by the same reference numerals, and a duplicate description will be appropriately omitted. In addition, the embodiments do not limit the invention and are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

図1は実施の形態における電池パック1の全体構成を示す分解斜視図、図2は電池パック1の上側ケース部を外した状態の平面図、図3は電池パック1が装着されるコードレス電動工具本体70が備える電池パック装着部80を示す電動工具本体底面側よりみた斜視図である。 FIG. 1 is an exploded perspective view showing an overall configuration of a battery pack 1 according to an embodiment, FIG. 2 is a plan view showing a state where an upper case portion of the battery pack 1 is removed, and FIG. 3 is a cordless power tool to which the battery pack 1 is attached. FIG. 6 is a perspective view showing a battery pack mounting portion 80 included in the main body 70 as viewed from the bottom surface side of the electric tool main body.

図1及び図2において、電池パック1は、複数の電池セルを有する電池セル組2と、電池セル組2を収納する電池ケース3と、電池セル組2上に載置固定される基板4と、基板4上に固着される端子群5と、防塵等のために基板4上に固定される基板カバー6とを有する。本実施の形態の電池パック1では、端子群5は従来1個であった正側放電端子を複数含んでいる。つまり、図示の場合、2個の正側放電端子5P−1,5P−2及び負側放電端子5Nと、制御信号端子(以下、「LD端子」という)5LDとを含んでいる。正側放電端子5P−2(パック側分岐端子)は、正側放電端子が1つの電池パック1Aでは空きスペースとなっていた正側放電端子5P−1に隣接するスペースに配置される。 1 and 2, a battery pack 1 includes a battery cell set 2 having a plurality of battery cells, a battery case 3 accommodating the battery cell set 2, and a substrate 4 mounted and fixed on the battery cell set 2. , A terminal group 5 fixed on the substrate 4, and a substrate cover 6 fixed on the substrate 4 for dustproof and the like. In the battery pack 1 of the present embodiment, the terminal group 5 includes a plurality of positive side discharge terminals, which is one in the past. That is, in the illustrated case includes a two positive discharge terminal 5P-1,5P-2 and negative discharge terminal 5N, control signal terminal (hereinafter, referred to as "LD terminal") and a 5 LD. The positive side discharge terminal 5P-2 (pack side branch terminal) is arranged in a space adjacent to the positive side discharge terminal 5P-1 which is an empty space in the battery pack 1A having one positive side discharge terminal.

電池ケース3は上側ケース部3Aと下側ケース部3Bの組み合わせ構造であり、両者を組み合わせたときに基板4や端子群5が設置された電池セル組2をがたつかないように保持する。上側ケース部3Aの両側には、図3に示す電動工具本体70が備える電池パック装着部80側のレール部82が嵌合する凹溝31が形成されている。また、上側ケース部3Aの両側には、ラッチ部材35が設けられる。ラッチ部材35は凹溝31に形成された穴32から突出するように付勢されるラッチ36と、ラッチ解除用の押しボタン部37とを有している。また、上側ケース部3Aには端子群5を露出させるスリット穴33が形成されている。 The battery case 3 has a combined structure of the upper case part 3A and the lower case part 3B, and holds the battery cell set 2 in which the substrate 4 and the terminal group 5 are installed so as not to rattling when the both are combined. On both sides of the upper case portion 3A, a concave groove 31 into which a rail portion 82 on the battery pack mounting portion 80 side of the electric tool body 70 shown in FIG. 3 is fitted is formed. Latch members 35 are provided on both sides of the upper case portion 3A. The latch member 35 has a latch 36 that is biased so as to project from a hole 32 formed in the concave groove 31, and a push button portion 37 for releasing the latch. Further, a slit hole 33 exposing the terminal group 5 is formed in the upper case portion 3A.

図4のブロック図に示すように、基板4には電流検出手段としての電流検出抵抗41,42及び制御部(保護手段)としてのマイクロコンピュータ45が搭載されている。基板4に取り付けられた正側放電端子5P−1は電流検出抵抗41を介して電池セル組2の正側電圧供給端に接続され、基板4に取り付けられたもう一つの正側放電端子5P−2も電流検出抵抗42を介して電池セル組2の正側電圧供給端に接続され、負側放電端子5Nは電池セル組2の負側電圧供給端に接続されている。無負荷状態では正側放電端子5P−1,5P−2は同電位であり、放電時も電流検出抵抗41,42は微小抵抗値であるため実質的に同電位である。マイコン45には電流検出抵抗41,42の電圧降下(検出電流値)が入力されることで、マイコン45側にて正側放電端子5P−1,5P−2の放電電流を個別に認識でき、放電電流が過電流であるとして放電を停止する過電流検知閾値の決定に利用する。 As shown in the block diagram of FIG. 4, current detection resistors 41 and 42 as current detection means and a microcomputer 45 as a control unit (protection means) are mounted on the substrate 4. The positive side discharge terminal 5P-1 attached to the substrate 4 is connected to the positive side voltage supply end of the battery cell set 2 via the current detection resistor 41, and another positive side discharge terminal 5P- attached to the substrate 4 is connected. 2 is also connected to the positive side voltage supply end of the battery cell set 2 via the current detection resistor 42, and the negative side discharge terminal 5N is connected to the negative side voltage supply end of the battery cell set 2. In the unloaded state, the positive side discharge terminals 5P-1 and 5P-2 have the same potential, and the current detection resistors 41 and 42 also have the minute resistance value even at the time of discharge, and thus have substantially the same potential. By inputting the voltage drop (detection current value) of the current detection resistors 41 and 42 to the microcomputer 45, the discharge current of the positive side discharge terminals 5P-1 and 5P-2 can be individually recognized on the side of the microcomputer 45, It is used to determine the overcurrent detection threshold value at which the discharge is stopped because the discharge current is an overcurrent.

本実施の形態に係る図3に示すコードレス電動工具本体70の電池パック装着部80は、例えば本体70のグリップ部71の下部端面に設けられている。電池パック装着部80は電池パック1の上部が嵌る凹部81を有し、その凹部内側の両側面に電池パック1側の凹溝31に嵌合するレール部82が形成されている。レール部82には電池パック1側のラッチ36と係合する係合凹部83が形成されている。電池パック装着部80は、電池パック1側の複数の正側放電端子5P−1,5−2にそれぞれ接続可能な正側受電端子9P−1,9P−2(分岐端子)、負側放電端子5Nに接続可能な負側受電端子9N、及びLD端子5LDに接続する制御信号端子9LDを、凹部81の底面に有している。各端子9P−1,9P−2,9N,9LDは、電池パック1の装着時に端子5P−1,5−2,5N,5LDでそれぞれ挟持される板状金属端子であり、凹部81の底面に固定配置されている。電池パック1側のLD端子5LDは、放電電流が、過電流であるとして放電を停止する過電流検知閾値に到達した場合に放電禁止信号をコードレス電動工具本体70の制御信号端子9LDに出力するものである。分岐端子9P−2は、正側放電端子9P−1(端子9P−1が接続される放電経路)から分岐されて設けられている。 The battery pack mounting portion 80 of the cordless electric tool main body 70 shown in FIG. 3 according to the present embodiment is provided, for example, on the lower end surface of the grip portion 71 of the main body 70. The battery pack mounting portion 80 has a concave portion 81 into which the upper portion of the battery pack 1 is fitted, and rail portions 82 to be fitted into the concave grooves 31 on the battery pack 1 side are formed on both side surfaces inside the concave portion. An engagement recess 83 that engages with the latch 36 on the battery pack 1 side is formed in the rail portion 82. The battery pack mounting portion 80 includes positive side power receiving terminals 9P-1 and 9P-2 (branch terminals) connectable to the plurality of positive side discharge terminals 5P-1 and 5-2 on the battery pack 1 side, and a negative side discharge terminal. 5N that can be connected to the negative side power receiving terminal 9N, and a control signal terminal 9 LD to be connected to LD terminal 5 LD, has the bottom surface of the recess 81. Each of the terminals 9P-1, 9P-2, 9N, 9 LD is a plate-shaped metal terminal which is sandwiched between the terminals 5P-1, 5-2, 5N, 5 LD when the battery pack 1 is attached, and It is fixedly placed on the bottom. The LD terminal 5 LD on the side of the battery pack 1 outputs a discharge prohibition signal to the control signal terminal 9 LD of the cordless power tool body 70 when the discharge current reaches the overcurrent detection threshold value at which the discharge is stopped because it is an overcurrent. To do. The branch terminal 9P-2 is provided by being branched from the positive side discharge terminal 9P-1 (the discharge path to which the terminal 9P-1 is connected).

複数の受電端子9P−1,9P−2を有するコードレス電動工具本体70に電池パック1が装着される場合は正側放電端子5P−1,5−2の両方に放電電流が検出されることになり、また従来のコードレス電動工具本体70Aに電池パック1が装着される場合は正側放電端子5P−1,5−2の一方のみに放電電流が検出されることになるが、電池パック1では、正側放電端子5P−1,5−2の一方のみに放電電流が検出された場合と、両方に放電電流が検出された場合とで、過電流検知閾値を異ならせるようにしている(詳細は後述する)。 When the battery pack 1 is attached to the cordless power tool body 70 having the plurality of power receiving terminals 9P-1 and 9P-2, the discharge current is detected at both the positive side discharge terminals 5P-1 and 5-2. When the battery pack 1 is attached to the conventional cordless power tool body 70A, the discharge current is detected only on one of the positive side discharge terminals 5P-1 and 5-2. , The overcurrent detection threshold is made different when the discharge current is detected in only one of the positive side discharge terminals 5P-1 and 5-2 and when the discharge current is detected in both of them (details). Will be described later).

図4に示すように、コードレス電動工具本体70(以下、従来の電動工具本体70A(旧型電動工具本体)と区別するために新型電動工具本体と言う場合がある)は、端子9P−1,9P−2,9N,9LDの他に、運転開始・停止、回転速度制御等を行うスイッチSW、マイコン71、FETを含むモータ駆動回路72、モータ駆動回路72で駆動されるモータM等を有している。過電流検知閾値に到達したことを示す制御信号(放電禁止信号)が制御信号端子9LDを通してマイコン71に入力されると、マイコン71はモータ駆動回路72を介してモータMを停止する。 As shown in FIG. 4, the cordless power tool body 70 (hereinafter, may be referred to as a new power tool body to distinguish it from the conventional power tool body 70A (old model power tool body)) has terminals 9P-1 and 9P. In addition to -2, 9N, 9 LD , it has a switch SW for starting/stopping operation, controlling the rotation speed, etc., a microcomputer 71, a motor drive circuit 72 including an FET, a motor M driven by the motor drive circuit 72, and the like. ing. When a control signal (discharge prohibition signal) indicating that the overcurrent detection threshold value is reached is input to the microcomputer 71 through the control signal terminal 9 LD , the microcomputer 71 stops the motor M via the motor drive circuit 72.

本実施の形態に係る電池パック1は、接続される電動工具本体が正側放電端子5P−1,5−2の両方を使用するもの(新型電動工具本体)であるか、一方のみを使用するもの(旧型電動工具本体)であるかによって、過電流検知閾値を変更する制御をマイコン45で行うことができる。例えば1端子(旧型電動工具本体)であれば過電流検知閾値を50A、2端子(新型電動工具本体)であれば過電流検知閾値を100Aと変える事を可能にする。具体例を図4及び図5のブロック図、並びに図6のフローチャートで説明する。 In the battery pack 1 according to the present embodiment, the connected power tool body uses both of the positive side discharge terminals 5P-1 and 5-2 (new power tool body), or uses only one of them. The microcomputer 45 can perform control for changing the overcurrent detection threshold depending on whether it is an old power tool body. For example, it is possible to change the overcurrent detection threshold value to 50 A for 1 terminal (old model power tool body) and 100 A for the 2 terminal (new model power tool body). Specific examples will be described with reference to the block diagrams of FIGS. 4 and 5 and the flowchart of FIG.

図6のフローチャートにおいて、スタート(コードレス電動工具の電源オンでありスイッチSWをオン)後のステップS1で正側放電端子5P−2に放電電流有りかどうか判断する。この判断は電流検出抵抗41,42の電圧降下を受けるマイコン45で行う。端子5P−2に放電電流無しの場合、図5(A)のように旧型電動工具本体70Aが接続されていると判断する。そして、ステップS2で過電流検知閾値ILimをIに設定する。次に、ステップS3で正側放電端子5P−1の放電電流が過電流検知閾値ILim(=I)以下であるかどうかマイコン45で判断する。そして、端子5P−1の放電電流が過電流検知閾値ILim(=I)を超えた場合には、マイコン45から制御信号(放電禁止信号)が制御信号端子5LD及び9LDを通してマイコン71に入力され、マイコン71はモータ駆動回路72をオフ(OFF)してモータMを停止する。すなわち電池パック1の放電を停止する。 In the flowchart of FIG. 6, it is determined whether or not there is a discharge current at the positive side discharge terminal 5P-2 in step S1 after the start (the power of the cordless electric tool is on and the switch SW is turned on). This judgment is made by the microcomputer 45 which receives the voltage drop of the current detection resistors 41 and 42. When there is no discharge current at the terminal 5P-2, it is determined that the old type electric power tool body 70A is connected as shown in FIG. 5(A). Then, in step S2, the overcurrent detection threshold I Lim is set to I L. Next, in step S3, the microcomputer 45 determines whether the discharge current of the positive side discharge terminal 5P-1 is less than or equal to the overcurrent detection threshold I Lim (=I L ). Then, when the discharge current of the terminal 5P-1 exceeds the overcurrent detection threshold I Lim (=I L ), a control signal (discharge prohibiting signal) from the microcomputer 45 passes through the control signal terminals 5 LD and 9 LD to the microcomputer 71. , The microcomputer 71 turns off the motor drive circuit 72 to stop the motor M. That is, the discharge of the battery pack 1 is stopped.

一方、ステップS1で端子5P−2に放電電流有りの場合、図4又は図5(B)のように新設の端子5P−2への接続機能を有する新型電動工具本体が接続されていると判断する。そして、ステップS4で端子5P−1に放電電流有りかどうか判断する。端子5P−1に放電電流が無い場合(Noの場合)、図5(B)のように従来からある端子5P−1には接続しないが新設の端子5P−2への接続機能を有する新型電動工具本体70Bが接続されていると判断し、ステップS5で過電流検知閾値ILimをIH2に設定する。但し、IH2>Iであり、過電流検知閾値ILimを高めに設定することになる。次に、ステップS6で正側放電端子5P−2の放電電流が過電流検知閾値ILim(=IH2)以下であるかどうかマイコン45で判断する。そして、端子5P−2の放電電流が過電流検知閾値ILim(=IH2)を超えた場合には上記と同様、マイコン45から制御信号(放電禁止信号)が制御信号端子5LD及び9LDを通してマイコン71に入力され、マイコン71はモータ駆動回路72をオフ(OFF)して電池パック1の放電を停止する。 On the other hand, if there is a discharge current at the terminal 5P-2 in step S1, it is determined that the new power tool body having the function of connecting to the new terminal 5P-2 is connected as shown in FIG. 4 or FIG. 5B. To do. Then, in step S4, it is determined whether or not there is a discharge current at the terminal 5P-1. When there is no discharge current at the terminal 5P-1 (No), as shown in FIG. 5B, the new type electric motor which is not connected to the existing terminal 5P-1 but has a function of connecting to the new terminal 5P-2 It is determined that the tool body 70B is connected, and the overcurrent detection threshold I Lim is set to I H2 in step S5. However, I H2 >I L, which means that the overcurrent detection threshold I Lim is set higher. Next, in step S6, the microcomputer 45 determines whether the discharge current of the positive side discharge terminal 5P-2 is less than or equal to the overcurrent detection threshold I Lim (=I H2 ). Then, when the discharge current of the terminal 5P-2 exceeds the overcurrent detection threshold value I Lim (=I H2 ), the control signal (discharge prohibition signal) is sent from the microcomputer 45 to the control signal terminals 5 LD and 9 LD as in the above. Is input to the microcomputer 71 through the microcomputer 71, and the microcomputer 71 turns off the motor drive circuit 72 to stop discharging the battery pack 1.

ステップS4で端子5P−1に放電電流がある場合(Yesの場合)、図4のように両方の放電端子5P−1,5P−2への接続機能を有する新型電動工具本体70が接続されていると判断し、ステップS7で過電流検知閾値ILimをIH1に設定する。但し、IH1>IH2>Iであり、過電流検知閾値ILimをさらに高めに設定することになる。次に、ステップS8で端子5P−1の放電電流と端子5P−2の放電電流との合計値が過電流検知閾値ILim(=IH1)以下であるかどうかマイコン45で判断する。そして、端子5P−1,5P−2の放電電流合計値が過電流検知閾値ILim(=IH1)を超えた場合には上記と同様、モータ駆動回路72をオフ(OFF)して電池パック1の放電を停止する。 If there is a discharge current at the terminal 5P-1 in step S4 (Yes), the new power tool body 70 having a connection function to both discharge terminals 5P-1 and 5P-2 is connected as shown in FIG. Therefore, the overcurrent detection threshold I Lim is set to I H1 in step S7. However, I H1 >I H2 >I L, which means that the overcurrent detection threshold I Lim is set higher. Next, in step S8, the microcomputer 45 determines whether the total value of the discharge current of the terminal 5P-1 and the discharge current of the terminal 5P-2 is less than or equal to the overcurrent detection threshold I Lim (=I H1 ). When the total discharge current value of the terminals 5P-1 and 5P-2 exceeds the overcurrent detection threshold value I Lim (=I H1 ), the motor drive circuit 72 is turned off (OFF) in the same manner as above. The discharge of 1 is stopped.

なお、図5(C)は正側放電端子が1つの電池パック1Aに新型電動工具本体70を接続した場合であるが、電池パック1Aは1個の正側放電端子5Pを有するのみで、電動工具本体70の受電端子9P−2には電流を供給できない。従って、新型電動工具本体70の性能を充分に発揮できない。しかしながら、電池パック1Aの各端子に対応する位置に新型電動工具本体70の各端子が配置されているため、電池パック1Aと新型電動工具70は接続することが可能であり、電池パック1Aによって新型電動工具70を駆動することができる。なお、新型電動工具70は高容量・高出力の電池パック1で駆動するように設計されているため、電池パック1Aの能力は充分に発揮することができる。 Although FIG. 5C shows the case where the new power tool body 70 is connected to the battery pack 1A having one positive side discharge terminal, the battery pack 1A has only one positive side discharge terminal 5P. No current can be supplied to the power receiving terminal 9P-2 of the tool body 70. Therefore, the performance of the new power tool body 70 cannot be fully exhibited. However, since each terminal of the new power tool body 70 is arranged at a position corresponding to each terminal of the battery pack 1A, the battery pack 1A and the new power tool 70 can be connected. The power tool 70 can be driven. Since the new power tool 70 is designed to be driven by the high capacity/high power battery pack 1, the capacity of the battery pack 1A can be fully exerted.

本実施の形態によれば、下記の効果を奏することができる。 According to this embodiment, the following effects can be obtained.

(1) 複数の電池セルを有する電池セル組2と、電池セル組を収納する電池ケース3とを有する電池パック1において、電池セル組2の正側電圧供給端に接続する正側放電端子を複数個、つまり正側放電端子5P−1,5P−2を設けているので、複数個の放電端子の使い分けにより多様なコードレス電動工具についてその性能を引き出すことが可能である。また、電池パック1を正側放電端子5P−1,5P−2のそれぞれに接続する受電端子9P−1,9P−2を具備する電動工具本体70に装着した場合、端子間接続をいっそう確実にしてチャタリング現象の発生を抑制可能である。さらに、電池パック1は複数の正側放電端子を有するのに対し、電池パック1Aは正側放電端子が1個のみであるため、電池パック1Aとの識別を容易に行うことができる。 (1) In a battery pack 1 having a battery cell set 2 having a plurality of battery cells and a battery case 3 accommodating the battery cell set, a positive side discharge terminal connected to a positive side voltage supply end of the battery cell set 2 is provided. Since a plurality of, that is, positive side discharge terminals 5P-1 and 5P-2 are provided, it is possible to bring out the performance of various cordless electric tools by properly using the plurality of discharge terminals. Further, when the battery pack 1 is attached to the electric tool main body 70 having the power receiving terminals 9P-1 and 9P-2 that are connected to the positive side discharge terminals 5P-1 and 5P-2, respectively, the connection between the terminals is further ensured. It is possible to suppress the occurrence of chattering phenomenon. Further, while the battery pack 1 has a plurality of positive side discharge terminals, the battery pack 1A has only one positive side discharge terminal, so that it can be easily distinguished from the battery pack 1A.

(2) 正側放電端子5P−1,5P−2の各端子毎に電流検出手段(電流検出抵抗41,42)による電流検出を行うことで、電池パック1が接続されているコードレス電動工具本体が、1個の放電端子のみに接続する旧型電動工具本体70Aか、両方の放電端子に接続する機能を有する新型電動工具本体70であるかを判別可能である。 (2) The cordless electric tool main body to which the battery pack 1 is connected by detecting the current by the current detecting means (current detecting resistors 41 and 42) for each of the positive side discharge terminals 5P-1 and 5P-2. It is possible to determine whether is the old type electric power tool body 70A that is connected to only one discharge terminal or the new power tool body 70 that has a function of connecting to both discharge terminals.

(3) 正側放電端子5P−1,5P−2の各端子毎の電流検出手段(電流検出抵抗41,42)による電流検出値は制御部(保護手段)としてのマイコン45に入力されているので、放電電流が過電流であるとして放電を停止する過電流検知閾値を、各端子5P−1,5P−2毎の電流検出値に応じてマイコン45で制御(変更)することが可能である。このため、電池パック1が装着される電動工具本体の性能、仕様に応じた過電流検知閾値に設定でき、電動工具本体の性能を充分に発揮させることができる。 (3) The current detection value by the current detection means (current detection resistors 41, 42) for each of the positive side discharge terminals 5P-1, 5P-2 is input to the microcomputer 45 as a control unit (protection means). Therefore, it is possible for the microcomputer 45 to control (change) the overcurrent detection threshold value at which the discharge is stopped because the discharge current is an overcurrent, according to the current detection value for each of the terminals 5P-1 and 5P-2. .. For this reason, it is possible to set the overcurrent detection threshold value according to the performance and specifications of the power tool body to which the battery pack 1 is attached, and the performance of the power tool body can be fully exhibited.

具体的に言えば、既存のコードレス電動工具70Aは正側受電端子が1つであるため、本実施の形態の電池パック1の使用時は過電流検知閾値を現行電池パックと同等にし、モータ駆動用FETの定格を守り、またモータやモータ駆動用FETの温度上昇による電動工具本体の破損を回避することができる。また、電池パック1の複数の放電端子5P−1,5P−2に対応する受電端子9P−1,9P−2を有する新型電動工具本体70(例えばハイパワー製品)は、モータ駆動用FETの定格を上げることで、電池パック1側の過電流検知閾値を高くすることができ、充分にその性能を発揮できる。また、電池パック1の性能をフルに引き出す事が可能になる。 Specifically, since the existing cordless power tool 70A has only one positive side power receiving terminal, when the battery pack 1 according to the present embodiment is used, the overcurrent detection threshold value is made equal to that of the current battery pack, and the motor drive is performed. It is possible to keep the rating of the power FET and avoid damage to the electric tool body due to temperature rise of the motor and the motor driving FET. In addition, the new power tool body 70 (for example, a high power product) having the power receiving terminals 9P-1 and 9P-2 corresponding to the plurality of discharging terminals 5P-1 and 5P-2 of the battery pack 1 is a motor driving FET rating. By increasing the value, the overcurrent detection threshold value on the battery pack 1 side can be increased and the performance can be sufficiently exhibited. Further, it is possible to maximize the performance of the battery pack 1.

(4) 正側放電端子が1個のみの電池パック1Aの基板4上には、正側放電端子5Pに隣接して端子1個分の空きスペースがあり、本実施の形態の電池パック1は、その空きスペースに正側放電端子をもう一つ追加する構造に相当するため、基板4上の端子群5の配列間隔は変更しなくともよく、旧型電動工具本体に対して電池パック1Aの代わりに支障なく電池パック1を装着でき、互換性を確保できる。 (4) On the substrate 4 of the battery pack 1A having only one positive side discharge terminal, there is an empty space for one terminal adjacent to the positive side discharge terminal 5P, and the battery pack 1 of the present embodiment is Since it corresponds to a structure in which another positive side discharge terminal is added to the empty space, it is not necessary to change the arrangement interval of the terminal group 5 on the substrate 4, and instead of the battery pack 1A for the old type electric tool main body. The battery pack 1 can be attached without any trouble, and compatibility can be secured.

以上、実施の形態を例に本発明を説明したが、実施の形態の各構成要素や各処理プロセスには請求項に記載の範囲で種々の変形が可能であることは当業者に理解されるところである。以下、変形例について触れる。 Although the present invention has been described with the embodiment as an example, it will be understood by those skilled in the art that various modifications can be made to each component and each process of the embodiment within the scope of the claims. By the way. Hereinafter, modified examples will be described.

本発明の上記実施の形態では、電池パックの正側放電端子を複数個としたが、負側放電端子を複数個にして、各端子の放電電流を個別に計測する構成も可能である。また、図10のように、正側放電端子5P−2及び受電端子9P−2をモータMと電池セル組2との放電経路に設けるのではなく、信号端子(分岐端子)として利用してもよい。すなわち、受電端子9P−2(分岐端子)は受電端子9P−1に接続され分岐して並列に接続されているため、受電端子9P−1と分岐端子9P−2には電池セル組2の電圧が出力される。分岐端子9P−2は電池パック1側のパック側分岐端子5P−2に接続される。分岐端子9P−2からの電圧は、分圧抵抗からなる電圧変換回路42aによって降圧されてマイコン45に入力される。マイコン45は電圧変換回路42aから信号が入力されると、新型電動工具本体70が接続されたと判断することができる。一方、旧型電動工具本体70Aが接続された場合にはパック側分岐端子5P−2に接続される端子がないため、電圧変換回路42aからの信号がマイコン45に入力されない。この変形例の場合には、図6のステップS1で電流ではなく電圧(電圧変換回路42aの出力の有無)を検出することにより、図6と同様に放電を制御することができる。なお、ステップS6、S8では端子5P−1の電流に基づいて判断すればよい。 In the above-described embodiment of the present invention, the battery pack has a plurality of positive side discharge terminals, but it is possible to have a plurality of negative side discharge terminals and individually measure the discharge current of each terminal. Further, as shown in FIG. 10, the positive side discharge terminal 5P-2 and the power receiving terminal 9P-2 are not provided in the discharge path between the motor M and the battery cell set 2, but may be used as signal terminals (branch terminals). Good. That is, since the power receiving terminal 9P-2 (branch terminal) is connected to the power receiving terminal 9P-1 and branched and connected in parallel, the voltage of the battery cell set 2 is applied to the power receiving terminal 9P-1 and the branch terminal 9P-2. Is output. The branch terminal 9P-2 is connected to the pack side branch terminal 5P-2 on the battery pack 1 side. The voltage from the branch terminal 9P-2 is stepped down by the voltage conversion circuit 42a including a voltage dividing resistor and input to the microcomputer 45. When a signal is input from the voltage conversion circuit 42a, the microcomputer 45 can determine that the new power tool body 70 is connected. On the other hand, when the old type electric power tool main body 70A is connected, since there is no terminal connected to the pack side branch terminal 5P-2, the signal from the voltage conversion circuit 42a is not input to the microcomputer 45. In the case of this modification, discharge can be controlled in the same manner as in FIG. 6 by detecting voltage (presence or absence of output of the voltage conversion circuit 42a) instead of current in step S1 of FIG. In addition, in steps S6 and S8, the determination may be made based on the current of the terminal 5P-1.

本発明は、コードレス電動ドライバードリル等の他、電池パックを装着して使用する草刈り機等の電池パックを駆動源とする電動作業機を含む各種電動工具に本発明が適用可能であることが明らかである。 INDUSTRIAL APPLICABILITY It is clear that the present invention is applicable to various electric tools including a cordless electric screwdriver drill and the like, and an electric working machine driven by a battery pack such as a mower used with the battery pack attached. is there.

1,1A 電池パック、2 電池セル組、3 電池ケース、4 基板、5 端子群、5P,5P−1,5P−2 正側放電端子、5N 負側放電端子、5LD 制御信号端子(LD端子)、6 基板カバー、9P,9P−1,9P−2 正側受電端子、9N 負側受電端子、9LD 制御信号端子、31 凹溝、35 ラッチ部材、41,42 電流検出抵抗、45,71 マイコン、70,70A,70B コードレス電動工具本体、71 グリップ部、72 モータ駆動回路、80,80A 電池パック装着部、82 レール部、M モータ、SW スイッチ 1, 1A battery pack, 2 battery cell set, 3 battery case, 4 substrate, 5 terminal group, 5P, 5P-1, 5P-2 positive side discharge terminal, 5N negative side discharge terminal, 5 LD control signal terminal (LD terminal) ), 6 substrate cover, 9P, 9P-1, 9P-2 positive side power receiving terminal, 9N negative side power receiving terminal, 9 LD control signal terminal, 31 concave groove, 35 latch member, 41, 42 current detection resistor, 45, 71 Microcomputer, 70, 70A, 70B Cordless power tool body, 71 Grip part, 72 Motor drive circuit, 80, 80A Battery pack mounting part, 82 Rail part, M motor, SW switch

Claims (12)

複数の電池セルを有する電池セル組と、
前記電池セル組を収納する電池ケースと、
前記電池セル組の正側及び負側電圧供給端にそれぞれ接続する正側及び負側放電端子と、
前記電池セル組からの放電電流が過電流検知閾値を超えると放電を停止するよう構成された制御部と、を備え、
前記制御部は、前記電池パックに接続された電動工具本体の種類に応じて前記過電流検知閾値を変更可能に構成されることを特徴とする電池パック。
A battery cell set having a plurality of battery cells,
A battery case for housing the battery cell set,
Positive side and negative side discharge terminals connected to the positive side and negative side voltage supply terminals of the battery cell set, respectively,
A control unit configured to stop discharging when the discharge current from the battery cell set exceeds an overcurrent detection threshold value ,
The battery pack, wherein the control unit is configured to be able to change the overcurrent detection threshold according to a type of a power tool body connected to the battery pack.
前記正側及び負極放電端子の少なくとも一方を介して前記電池パックに接続された電動工具本体の種類を判別可能としたことを特徴とする請求項1に記載の電池パック。 The battery pack according to claim 1, wherein the type of the power tool body connected to the battery pack can be discriminated through at least one of the positive side and the negative electrode discharge terminal. 前記正側及び負側放電端子の少なくとも一方は、複数個設けられてい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。The battery pack according to claim 1, wherein a plurality of at least one of the positive side and negative side discharge terminals are provided. 前記電動工具本体の種類の判別は、前記複数個設けられている前記正側及び負側放電端子の少なくとも一方を介して行うことを特徴とする請求項に記載の電池パック。 The battery pack according to claim 3 , wherein the type of the electric tool body is determined through at least one of the positive side and negative side discharge terminals provided in the plurality. 複数個設けられた端子の各端子に流れる電流を検出する電流検出手段を有することを特徴とする請求項3又は4のいずれか一項に記載の電池パック。 The battery pack according to any one of claims 3 or 4, characterized in that it has a current detecting means for detecting a current flowing through each terminal of the plurality provided the pin. 複数の電池セルを有する電池セル組と、
前記電池セル組を収納する電池ケースと、
前記電池セル組の正側及び負側電圧供給端にそれぞれ接続する正側及び負側放電端子と、を備え、
前記正側及び負側放電端子の少なくとも一方は複数個設けられており、
前記複数個設けられた端子の各端子に流れる電流を検出する電流検出手段を有し、
前記電流検出手段の電流検出値は制御部に入力され、前記制御部は、過電流であるとして放電を停止する過電流検知閾値を、各端子の電流検出値に応じて変更可能としたことを特徴とする電池パック。
A battery cell set having a plurality of battery cells,
A battery case for housing the battery cell set,
A positive side and a negative side discharge terminal respectively connected to the positive side and negative side voltage supply terminals of the battery cell set,
At least one of the positive side and negative side discharge terminals is provided in plurality,
A current detection means for detecting a current flowing through each of the plurality of terminals provided,
The current detection value of the current detection unit is input to the control unit, and the control unit can change the overcurrent detection threshold value for stopping the discharge as an overcurrent , according to the current detection value of each terminal. It shall be the feature batteries pack.
前記複数個設けられた端子は、実質的に同電位であることを特徴とする請求項3乃至6のいずれか一項に記載の電池パック。The battery pack according to any one of claims 3 to 6, wherein the plurality of terminals have substantially the same potential. 請求項1乃至のいずれか一項に記載の前記電池パックを、本体の電池パック装着部に着脱自在に装着することを特徴とする電動工具。 An electric power tool, wherein the battery pack according to any one of claims 1 to 7 is detachably attached to a battery pack attachment portion of a main body. 記正側又は負側放電端子のそれぞれに接続する受電端子を有することを特徴とする請求項に記載の電動工具。 Electric tool according to claim 8, characterized in that it comprises a power receiving terminal connected to the respective front KiTadashigawa or negative discharge terminal. 電池パック、第1の電動工具本体、及び、第2の電動工具本体を備えたシステムであって、A system including a battery pack, a first power tool body, and a second power tool body,
前記電池パックは、正側及び負側放電端子を有し、The battery pack has positive and negative discharge terminals,
前記第1の電動工具本体は、前記正側及び負側放電端子にそれぞれ接続される第1の本体側正側及び負側端子と、前記第1の本体側正側及び負側端子の少なくとも一方から分岐する分岐端子と、を有し、The first electric power tool main body has at least one of a first main body side positive side and a negative side terminal connected to the positive side and the negative side discharge terminals, and a first main body side positive side and a negative side terminal. A branch terminal that branches from,
前記第2の電動工具本体は、前記正側及び負側放電端子にそれぞれ接続される第2の本体側正側及び負側端子を有すると共に、前記分岐端子に相当する端子を有さず、The second power tool main body has second main body side positive side and negative side terminals connected to the positive side and negative side discharge terminals, respectively, and does not have terminals corresponding to the branch terminals,
前記電池パックは、過電流であるとして放電を停止する過電流検知閾値を、前記分岐端子の有無に応じて変更可能としたことを特徴とするシステム。The system is characterized in that the battery pack is capable of changing an overcurrent detection threshold value for stopping discharge as an overcurrent, depending on the presence or absence of the branch terminal.
前記電池パックは、前記分岐端子と接続されるパック側分岐端子を有することを特徴とする請求項10に記載のシステムThe system according to claim 10 , wherein the battery pack has a pack side branch terminal connected to the branch terminal. 前記電池パックは電池セルを有し、
前記第1の電動工具本体はモータを有し、
前記分岐端子及び前記パック側分岐端子は、前記電池セルと前記モータとの放電経路に設けられることを特徴とする請求項11に記載のシステム
The battery pack has battery cells,
The first power tool body has a motor,
The system according to claim 11 , wherein the branch terminal and the pack-side branch terminal are provided in a discharge path between the battery cell and the motor.
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