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JP2010050002A - Electric power tool system - Google Patents

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JP2010050002A
JP2010050002A JP2008214591A JP2008214591A JP2010050002A JP 2010050002 A JP2010050002 A JP 2010050002A JP 2008214591 A JP2008214591 A JP 2008214591A JP 2008214591 A JP2008214591 A JP 2008214591A JP 2010050002 A JP2010050002 A JP 2010050002A
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battery pack
battery
power tool
cell
internal resistance
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JP5277795B2 (en
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Shigeru Takahashi
高橋  滋
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Koki Holdings Co Ltd
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Hitachi Koki 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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Abstract

【課題】工具の使い勝手と大出力化を両立させることで様々な作業内容に適応できる電動工具システムを提供すること。
【解決手段】複数の電池セルを直列接続して構成した電池パック12と、互いに並列接続した電池セルからなるセル組を複数直列接続して構成した電池パック3とを、共通の電動工具に使用可能な電動工具システムであって、電池パック12に用いられる電池セル8は、電池パック3に用いられる電池セル1の内部抵抗よりも相対的に小さい内部抵抗とされている。
【選択図】図2
To provide an electric tool system that can be adapted to various work contents by achieving both usability of a tool and high output.
A battery pack 12 configured by connecting a plurality of battery cells in series and a battery pack 3 configured by connecting a plurality of cell sets including battery cells connected in parallel to each other are used in a common electric tool. It is a possible electric tool system, and the battery cell 8 used for the battery pack 12 has an internal resistance relatively smaller than the internal resistance of the battery cell 1 used for the battery pack 3.
[Selection] Figure 2

Description

本発明は、複数の電池セルを直列接続して構成した電池パックと、互いに並列接続した電池セルからなるセル組を複数直列接続して構成した電池パックとを、共通の電動工具に使用可能な電動工具システムに関する。   The present invention can use a battery pack configured by connecting a plurality of battery cells in series and a battery pack configured by connecting a plurality of cell sets including battery cells connected in parallel to each other as a common electric tool. The present invention relates to a power tool system.

近年、電動工具用電池は、小型軽量を図るために、ニッケルカドミウム電池からリチウムイオン電池にシフトしてきている。リチウムイオン電池はニッケルカドミウム電池と比較すると、電池セル当りの電圧が3倍、容量が1/2であるため、同電圧、同容量では、1.5倍小型軽量化が図れる。一方、電動工具の電池は高負荷作業にも耐えられるように、大電流が流せる高出力電池が要求され、リチウムイオン電池はニッケルカドミウム電池と比較すると、電池の寿命、電池の安全性の面から大電流を流せないため、下記特許文献1に示すように、並列接続した電池セルからなるセル組を複数直列接続して構成した電池パックとすることにより、電池パックの容量は2倍、前記セルアセンブリの一方に流れる電流を1/2に低減して安全性を保ちつつ大電流放電が可能となるように構成している。   In recent years, power tool batteries have shifted from nickel-cadmium batteries to lithium-ion batteries in order to reduce size and weight. Compared with a nickel cadmium battery, a lithium ion battery has a voltage per battery cell three times and a capacity ½, so that the same voltage and capacity can reduce the size and weight by 1.5 times. On the other hand, the power tool battery is required to be a high-power battery that can carry a large current so that it can withstand high-load work. Lithium-ion batteries are compared to nickel-cadmium batteries in terms of battery life and battery safety. Since a large current cannot flow, as shown in Patent Document 1 below, the battery pack has a capacity that is doubled by forming a battery pack that is formed by connecting a plurality of cell sets made of parallel connected battery cells in series. The current flowing to one side of the assembly is reduced to ½ so that large current discharge is possible while maintaining safety.

特開2008−182779号公報JP 2008-182779 A

上記構成では、大出力に対応できるものの、電池パックのサイズが大型化するために電動工具の使い勝手が犠牲になってしまう。一方、工具の使い勝手を優先させる場合には、電池セルを直列接続して構成した小型の電池パックを使用することとなり、工具の出力及び作業時間を犠牲にしなければならないという問題がある。   Although the above configuration can cope with a large output, the size of the battery pack increases, and the usability of the power tool is sacrificed. On the other hand, when priority is given to the usability of the tool, a small battery pack configured by connecting battery cells in series is used, and there is a problem that the output of the tool and the working time must be sacrificed.

本発明は、上記事情に鑑みてなされたものであり、その目的は、工具の使い勝手と大出力化を両立させることで様々な作業内容に適応できる電動工具システムを提供することである。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric tool system that can adapt to various work contents by making the usability of a tool compatible with an increase in output.

上記目的を達成するために、請求項1の発明では、複数の電池セルを直列接続して構成した第1の電池パックと、互いに並列接続した電池セルからなるセル組を複数直列接続して構成した第2の電池パックとを、共通の電動工具に使用可能な電動工具システムであって、第1の電池パックに用いられる電池セルは、第2の電池パックに用いられる電池セルの内部抵抗よりも相対的に小さい内部抵抗とされていることを特徴としている。   In order to achieve the above object, according to the first aspect of the present invention, a first battery pack configured by connecting a plurality of battery cells in series, and a plurality of cell sets including battery cells connected in parallel to each other are connected in series. The second battery pack is a power tool system that can be used for a common power tool, and the battery cell used for the first battery pack is based on the internal resistance of the battery cell used for the second battery pack. Is characterized by relatively low internal resistance.

請求項2の発明では、第1の電池パックまたは第2の電池パックには、電動工具との間に流れる電流を制限する過電流防止回路が備えられていることを特徴としている。   The invention according to claim 2 is characterized in that the first battery pack or the second battery pack is provided with an overcurrent prevention circuit that limits a current flowing between the battery pack and the power tool.

請求項3の発明では、第1の電池パックまたは第2の電池パックには、電池セルの温度が所定以上になったときに電池パックの放電を禁止する高温防止回路が備えられていることを特徴としている。   In the invention of claim 3, the first battery pack or the second battery pack is provided with a high temperature prevention circuit for prohibiting the discharge of the battery pack when the temperature of the battery cell becomes a predetermined temperature or higher. It is a feature.

本発明によれば、第1の電池パックから取り出せる電流を多くできるため、この第1の電池パックを用いれば安全に大出力を得ることができるとともに、少ない電池セルで構成したことで工具を操作性良く使用することができる。また、第2の電池パックを用いることにより大出力を維持しつつ作業時間を長時間確保することができる。これにより、工具の操作性を損なうことなく安全に大出力を得ることができるため、様々な作業内容に適応することができる。   According to the present invention, since the current that can be taken out from the first battery pack can be increased, a large output can be obtained safely by using this first battery pack, and the tool can be operated by using a small number of battery cells. Can be used with good performance. Further, by using the second battery pack, it is possible to secure a long working time while maintaining a large output. Thereby, since a large output can be obtained safely without impairing the operability of the tool, it is possible to adapt to various work contents.

本発明に係る実施形態について図1および図2を用いて説明する。本実施形態の電動工具は、2種類の電池パックを共通の電動工具に使用可能に構成された電動工具システムである。図1に示すように、電池パック12は正負の接続端子を解して電動工具に接続されており、電動工具に備えられたトリガスイッチの操作により電動工具に対して電力供給が行われる。   An embodiment according to the present invention will be described with reference to FIGS. 1 and 2. The power tool of this embodiment is a power tool system configured so that two types of battery packs can be used as a common power tool. As shown in FIG. 1, the battery pack 12 is connected to the power tool via positive and negative connection terminals, and power is supplied to the power tool by operating a trigger switch provided in the power tool.

図1に示す電池パック12(第1の電池パック)は、いわゆる1並タイプの電池パックであり、電動工具と接続されるターミナル5に備えられる正負端子間には1つのセルアセンブリ7が接続されている。セルアセンブリ7は、複数の電池セル8を直列接続して構成されている。また、セルアセンブリ7にはセルアセンブリ7に流れる電流を検出するための電流検出用抵抗が接続されている。   The battery pack 12 (first battery pack) shown in FIG. 1 is a so-called single battery pack, and one cell assembly 7 is connected between the positive and negative terminals provided in the terminal 5 connected to the electric power tool. ing. The cell assembly 7 is configured by connecting a plurality of battery cells 8 in series. The cell assembly 7 is connected to a current detection resistor for detecting a current flowing through the cell assembly 7.

制御回路4は、セルアセンブリ7に流れる電流を検出し、セルアセンブリ7の過電流を判別する。過電流状態であると判別したときには、電動工具側に放電停止の信号を送信して、電動工具側に備えられているスイッチを開くことによって放電経路を遮断するようになっている。   The control circuit 4 detects a current flowing through the cell assembly 7 and determines an overcurrent of the cell assembly 7. When it is determined that the current is in an overcurrent state, a discharge stop signal is transmitted to the power tool side, and the discharge path is interrupted by opening a switch provided on the power tool side.

また、高温防止回路11は、例えばサーマルプロテクタ10により構成されており、充電時における電池パック12内の温度が所定温度以上となるとこのサーマルプロテクタ10のスイッチ状態が開状態となることにより充電経路が遮断されるようになっている。この高温防止回路11は、充電経路遮断機能のみでなく放電経路の遮断機能を持たせるように構成しても良い。   Moreover, the high temperature prevention circuit 11 is comprised by the thermal protector 10, for example, and when the temperature in the battery pack 12 at the time of charge becomes more than predetermined temperature, the switch state of this thermal protector 10 will be in an open state, and a charge path | route will be carried out. It is designed to be blocked. The high temperature prevention circuit 11 may be configured to have not only a charging path blocking function but also a discharging path blocking function.

本実施形態では、図2に示すように、いわゆる2並タイプの電池パック3(第2の電池パック)も電動工具に接続することができる。これは、互いに並列接続した電池セル1からなるセル組2を複数直列接続して構成されている。また、その他の構成は、電池パック12と同様の構成である。   In the present embodiment, as shown in FIG. 2, a so-called double battery pack 3 (second battery pack) can also be connected to the electric tool. This is configured by connecting a plurality of cell sets 2 including battery cells 1 connected in parallel to each other in series. Other configurations are the same as those of the battery pack 12.

ここで、電池パック3の電流容量は電池パック12の電流容量の2倍となっている。また、放電電流を同一とした場合、電池パック3の各電池セル1に流れる電流は電池パック12のセルアセンブリ7に流れる電流の1/2になっている。   Here, the current capacity of the battery pack 3 is twice the current capacity of the battery pack 12. When the discharge current is the same, the current flowing through each battery cell 1 of the battery pack 3 is ½ of the current flowing through the cell assembly 7 of the battery pack 12.

また、電池パック12の電池セル8の内部抵抗は、電池3電池セル1の40%以上改善品を使用している。電流容量は電池パック3の1/2、放電電流を同一とした場合は電池パック3の各電池セル1に流れる電流の2倍流れることとなる。   Moreover, the internal resistance of the battery cell 8 of the battery pack 12 is 40% or more improved from that of the battery 3 battery cell 1. When the current capacity is ½ of the battery pack 3 and the discharge current is the same, the current flows twice as much as the current flowing through each battery cell 1 of the battery pack 3.

基板6には、電動工具と充電器との電力の授受を行うためのターミナル5が設けられている。電池パック3または電池パック12を電動工具に装着すると電動工具のターミナルと電池のターミナル5が嵌合して、SW、整流子、モータ、と電流が流れて出力軸が回転する。ターミナル、SW、整流子、モータ等の電動工具全体の内部抵抗は、通常電池パック3の電池セル1の内部抵抗の約2倍程度であるため、電池3の電池セル1の内部抵抗をRとすると、電動工具全体の内部抵抗を2Rと仮定でき、電池パック3を含めた電動工具全体の内部抵抗は4R、流せる電流値は1×(V/R)、電池パック12を取付けた電動工具全体の内部抵抗は22/5R、流せる電流値は10/11×(V/R)となるため、電池パック12を取付けた電動工具の流せる電流値は電池3の10/11(0.91倍)となり工具実用時、9%程度の出力ダウンですむ。   The board 6 is provided with a terminal 5 for transferring power between the electric tool and the charger. When the battery pack 3 or the battery pack 12 is attached to the electric tool, the terminal of the electric tool and the terminal 5 of the battery are fitted, and the output shaft is rotated by the SW, commutator, motor, and current flowing. Since the internal resistance of the entire electric tool such as the terminal, SW, commutator, and motor is usually about twice the internal resistance of the battery cell 1 of the battery pack 3, the internal resistance of the battery cell 1 of the battery 3 is R. Then, the internal resistance of the entire power tool can be assumed to be 2R, the internal resistance of the entire power tool including the battery pack 3 is 4R, the flowing current value is 1 × (V / R), and the entire power tool with the battery pack 12 attached The internal resistance of the battery is 22 / 5R, and the current value that can be flowed is 10/11 × (V / R). Therefore, the current value that can be flowed by the power tool attached with the battery pack 12 is 10/11 (0.91 times) that of the battery 3. When the tool is in practical use, the output can be reduced by about 9%.

この結果、電池パック3を電動工具に取付けたときの作業と、電池パック12を電動工具に取付けて作業した場合で、電動工具の出力に差を感じることもなく、電池パック3と遜色なく作業することが可能となる。また、電池パック12は電池パック3に比べて電池セルの数を半分にして軽くすることができるため、工具使用時の操作性を良好に保つことができる。また、電動工具を長時間使用したい場合には、電流容量の多い電池パック3を用いれば大出力を維持しながら作業時間を適切に確保することができる。   As a result, the work when the battery pack 3 is attached to the power tool and the work when the battery pack 12 is attached to the power tool do not feel a difference in the output of the power tool and work in the same manner as the battery pack 3. It becomes possible to do. Further, since the battery pack 12 can be lightened by halving the number of battery cells as compared with the battery pack 3, the operability when using the tool can be kept good. In addition, when it is desired to use the electric tool for a long time, if the battery pack 3 having a large current capacity is used, the working time can be appropriately ensured while maintaining a large output.

このように、要求される作業内容に応じて電池パックを使い分けることができるため、使い勝手のよい電動工具システムを提供することができる。   Thus, since the battery pack can be used properly according to the required work content, an easy-to-use electric tool system can be provided.

また、過電流防止回路9および高温防止回路11を搭載しているので、電池パック12を使用して電動工具で高負荷作業を行って電池パック12に電池3の2倍の電流が流れても、電流値とセル温度を常に監視して、ある一定値を超えると電動工具への電力供給を停止させるので、すべての電動工具、作業に対応できるため、電池パック3と電池パック12の互換性をキープすることができ、更には高寿命で安全性の高いシステムを提供できる。
Further, since the overcurrent prevention circuit 9 and the high temperature prevention circuit 11 are mounted, even if a battery pack 12 is used to perform a high load operation with an electric tool, a current twice as large as that of the battery 3 flows through the battery pack 12. Because the current value and the cell temperature are constantly monitored and the power supply to the power tool is stopped when a certain value is exceeded, all power tools and work can be handled, so the compatibility between the battery pack 3 and the battery pack 12 In addition, it is possible to provide a system with a long life and high safety.

本発明の実施形態を示した回路図A circuit diagram showing an embodiment of the present invention 本発明の実施形態を示す電動工具システムのブロック回路図The block circuit diagram of the electric tool system which shows embodiment of this invention

符号の説明Explanation of symbols

1…電池セル
2…セル組
3…電池パック
4…充電制御回路
5…ターミナル
6…基板
7…セルアセンブリ
8…電池セル
9…過電流防止回路
10…サーマルプロテクタ
11…高温防止回路
12…電池パック
DESCRIPTION OF SYMBOLS 1 ... Battery cell 2 ... Cell group 3 ... Battery pack 4 ... Charge control circuit 5 ... Terminal 6 ... Board | substrate 7 ... Cell assembly 8 ... Battery cell 9 ... Overcurrent prevention circuit 10 ... Thermal protector 11 ... High temperature prevention circuit 12 ... Battery pack

Claims (3)

複数の電池セルを直列接続して構成した第1の電池パックと、
互いに並列接続した電池セルからなるセル組を複数直列接続して構成した第2の電池パックとを、共通の電動工具に使用可能な電動工具システムであって、
前記第1の電池パックに用いられる前記電池セルは、前記第2の電池パックに用いられる前記電池セルの内部抵抗よりも相対的に小さい内部抵抗とされていることを特徴とする電動工具システム。
A first battery pack configured by connecting a plurality of battery cells in series;
A power battery system that can be used for a common power tool, with a second battery pack configured by connecting a plurality of cell sets each composed of battery cells connected in parallel to each other,
The power tool system, wherein the battery cell used in the first battery pack has an internal resistance relatively smaller than an internal resistance of the battery cell used in the second battery pack.
前記第1の電池パックまたは前記第2の電池パックには、前記電動工具との間に流れる電流を制限する過電流防止回路が備えられていることを特徴とする請求項1に記載の電動工具システム。   2. The electric power tool according to claim 1, wherein the first battery pack or the second battery pack is provided with an overcurrent prevention circuit that limits a current flowing between the electric power tool and the first battery pack. system. 前記第1の電池パックまたは前記第2の電池パックには、前記電池セルの温度が所定以上になったときに前記電池パックの放電を禁止する高温防止回路が備えられていることを特徴とする請求項1または請求項2に記載の電動工具システム。   The first battery pack or the second battery pack is provided with a high temperature prevention circuit for prohibiting the discharge of the battery pack when the temperature of the battery cell becomes a predetermined temperature or more. The power tool system according to claim 1 or 2.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014128875A (en) * 2014-02-14 2014-07-10 Makita Corp Battery pack of electric power tool
US9050715B2 (en) 2010-08-30 2015-06-09 Makita Corporation Battery pack of electric power tool
JP2015128080A (en) * 2015-04-10 2015-07-09 株式会社マキタ Power tool system

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JPH01171782A (en) * 1987-12-23 1989-07-06 Matsushita Electric Works Ltd Electrically-driven tool
JPH08241705A (en) * 1995-03-07 1996-09-17 Matsushita Electric Ind Co Ltd Battery pack
JP2006247821A (en) * 2005-03-14 2006-09-21 Matsushita Electric Works Ltd Power tool
JP2007511380A (en) * 2003-11-20 2007-05-10 ペラン(ソシエテ アノニム) Power autonomous electric tool set

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01171782A (en) * 1987-12-23 1989-07-06 Matsushita Electric Works Ltd Electrically-driven tool
JPH08241705A (en) * 1995-03-07 1996-09-17 Matsushita Electric Ind Co Ltd Battery pack
JP2007511380A (en) * 2003-11-20 2007-05-10 ペラン(ソシエテ アノニム) Power autonomous electric tool set
JP2006247821A (en) * 2005-03-14 2006-09-21 Matsushita Electric Works Ltd Power tool

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9050715B2 (en) 2010-08-30 2015-06-09 Makita Corporation Battery pack of electric power tool
US9786877B2 (en) 2010-08-30 2017-10-10 Makita Corporation Battery pack of electric power tool
JP2014128875A (en) * 2014-02-14 2014-07-10 Makita Corp Battery pack of electric power tool
JP2015128080A (en) * 2015-04-10 2015-07-09 株式会社マキタ Power tool system

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