JP2009291045A - Battery pack - Google Patents

Battery pack Download PDF

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Publication number
JP2009291045A
JP2009291045A JP2008143422A JP2008143422A JP2009291045A JP 2009291045 A JP2009291045 A JP 2009291045A JP 2008143422 A JP2008143422 A JP 2008143422A JP 2008143422 A JP2008143422 A JP 2008143422A JP 2009291045 A JP2009291045 A JP 2009291045A
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Japan
Prior art keywords
battery pack
overcurrent
current
current path
fuse
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Withdrawn
Application number
JP2008143422A
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Japanese (ja)
Inventor
Hiroyuki Hanawa
浩之 塙
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 JP2008143422A priority Critical patent/JP2009291045A/en
Publication of JP2009291045A publication Critical patent/JP2009291045A/en
Withdrawn legal-status Critical Current

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    • 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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  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an overcurrent detection resistor and a lead wire for inputting the signal into a board, by making a fuse element serve as the overcurrent detection resistor, and to provide an inexpensive battery pack. <P>SOLUTION: The battery pack includes a battery cell, a terminal part connecting the battery cell and an external apparatus to form a current path to the external apparatus, a fuse arranged on the current path, a voltage detection means detecting both end voltages on the fuse, and an overcurrent detection means detecting an overcurrent on the current path based on the voltage detected by the voltage detection means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、電動工具等に用いられる電池パックに関するものである。   The present invention relates to a battery pack used for a power tool or the like.

図３に示すように、従来の電池パック１１は電池セル群電池１６と回路基板１２および過電流検出抵抗１５で構成され、過電流検出抵抗１５の両端はリード線で回路基板１２と接続されている。回路基板１２には電池パック１１に短絡電流等の過大な電流が発生した際に溶断するヒューズ素子１３および電動工具１７使用時のある規定値を超える過電流を検出する過電流検出回路１４が設けられている。   As shown in FIG. 3, the conventional battery pack 11 includes a battery group battery 16, a circuit board 12, and an overcurrent detection resistor 15. Both ends of the overcurrent detection resistor 15 are connected to the circuit board 12 by lead wires. Yes. The circuit board 12 is provided with a fuse element 13 that blows when an excessive current such as a short-circuit current is generated in the battery pack 11 and an overcurrent detection circuit 14 that detects an overcurrent exceeding a specified value when the electric tool 17 is used. It has been.

特開平１１−２０６０２５号公報JP 11-206025 A

しかし、従来の電池パックでは、回路基板と過電流検出抵抗が離間した位置にあるため、構造が複雑となり、部品点数が増加していた。このため、電池パックが高価になり、ひいては電池パックを備える電動工具も高価となっていた。   However, in the conventional battery pack, since the circuit board and the overcurrent detection resistor are located apart from each other, the structure is complicated and the number of parts is increased. For this reason, the battery pack is expensive, and the electric tool including the battery pack is also expensive.

本発明は、上記事情に鑑みてなされたものであって、その目的は、構造を単純にすることができ、安価に製造可能な電池パック及び電池パックを備えた電動工具を提供することを目的とする。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a battery pack that can be simplified in structure and can be manufactured at low cost, and an electric tool including the battery pack. And

上記目的を達成するために請求項１の発明では、電池セルと、電池セルと外部機器とを接続するものであって、外部機器との間で電流経路を形成する端子部と、電流経路上に配されるヒューズと、ヒューズの両端電圧を検出する電圧検出手段と、電圧検出手段が検出した検出電圧に基づいて電流経路上の過電流を検出する過電流検出手段と、を備えた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, there is provided a battery cell, a terminal for connecting the battery cell and an external device, forming a current path with the external device, and a current path. A fuse, a voltage detection means for detecting a voltage across the fuse, and an overcurrent detection means for detecting an overcurrent on the current path based on a detection voltage detected by the voltage detection means. It is a feature.

請求項２の発明では、過電流検出手段は、電流経路上に配置される電流遮断素子に対して信号出力可能に構成されており、過電流を検出したときには電流遮断素子をオフするための信号を出力することを特徴としている。   In the invention of claim 2, the overcurrent detecting means is configured to be capable of outputting a signal to a current interrupting element disposed on the current path, and a signal for turning off the current interrupting element when an overcurrent is detected. Is output.

請求項３の発明では、電流遮断素子を内部に備えることを特徴としている。   The invention of claim 3 is characterized in that a current interruption element is provided inside.

本発明の請求項１記載の電池パックによれば、ヒューズ素子にて電流を検出することで過電流検出抵抗を削減し、さらにはその周辺のリード線等の部品を削減できる。また、電池パックの短絡時等、ヒューズ素子の定格を超える過大な短絡電流が発生した場合はヒューズ素子自体が溶断し、電池パックの発煙・焼損を防ぐことができる。   According to the battery pack of the first aspect of the present invention, it is possible to reduce the overcurrent detection resistance by detecting the current with the fuse element, and further reduce the peripheral lead wire and other parts. In addition, when an excessive short circuit current exceeding the rating of the fuse element is generated, such as when the battery pack is short-circuited, the fuse element itself is melted and smoke and burnout of the battery pack can be prevented.

また、請求項２記載の電池パックによれば、過大な電流が発生した際、ヒューズ素子の溶断以前に電流遮断素子を開放し、電池パックの発煙・焼損を防ぎ、ヒューズ素子が溶断していないので短絡状態を解消することにより再び電池パックを使用することができる。   According to the battery pack of claim 2, when an excessive current is generated, the current interrupting element is opened before the fuse element is melted to prevent smoke and burning of the battery pack, and the fuse element is not melted. Therefore, the battery pack can be used again by eliminating the short-circuit state.

また、請求項３の発明では、電流遮断素子を電池パック内部へ設けることにより、電池パック単体の短絡等の過大な電流が発生した場合であっても、電池パックの発煙・焼損を防ぎ、ヒューズ素子が溶断していないので短絡状態を解消することにより再び電池パックを使用することができる。   Further, in the invention of claim 3, by providing the current interrupting element inside the battery pack, even if an excessive current such as a short circuit of the battery pack occurs, the smoke and burnout of the battery pack can be prevented, and the fuse Since the element is not melted, the battery pack can be used again by eliminating the short-circuit state.

本発明の実施の形態による電池パックについて図１に基づき説明する。図１に示されるように、電池パック１は、電池セル群６と回路基板２で構成されている。回路基板２はヒューズ素子３と過電流検出回路４を有している。   A battery pack according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the battery pack 1 includes a battery cell group 6 and a circuit board 2. The circuit board 2 has a fuse element 3 and an overcurrent detection circuit 4.

電動工具７使用時において、ヒューズ素子３両端に発生する電圧信号が過電流検出回路４に入力され、過電流検出回路４にてある規定値を超える過電流を検出した場合、過電流検出信号を出力し、電動工具７に設けられた電流遮断素子８を開放状態にし、電池パック１および電動工具7の焼損等の破損を防ぐことができる。   When the electric power tool 7 is used, a voltage signal generated at both ends of the fuse element 3 is input to the overcurrent detection circuit 4, and when an overcurrent exceeding a specified value is detected by the overcurrent detection circuit 4, an overcurrent detection signal is generated. It outputs, the electric current interruption element 8 provided in the electric tool 7 is made into an open state, and damage, such as burning of the battery pack 1 and the electric tool 7, can be prevented.

電池パック1単体で端子間短絡等が発生し、ヒューズ素子３の定格を超える電流が流れた場合、ヒューズ素子３が溶断して電池の発火・発煙を防止することができる。   When a short circuit between terminals occurs in the battery pack 1 alone and a current exceeding the rating of the fuse element 3 flows, the fuse element 3 is melted to prevent the battery from being ignited or smoked.

電動工具7もしくは電池パック1内の回路基板2に設けられた電流遮断素子８を開放状態にし、電池パック１および電動工具7の焼損等の破損を防ぐことができる。   The current interrupting element 8 provided on the electric power tool 7 or the circuit board 2 in the battery pack 1 can be opened to prevent the battery pack 1 and the electric power tool 7 from being damaged due to burning or the like.

電池パック1単体で端子間短絡が発生し、ヒューズ素子３の定格を超える電流が流れた場合、ヒューズ素子が溶断し、電池の発火・発煙を防止することができる。   When a short circuit occurs between the terminals of the battery pack 1 alone and a current exceeding the rating of the fuse element 3 flows, the fuse element is melted, and the battery can be prevented from being ignited or smoked.

また、図２の電池パックによれば、電流遮断素子８を電池パック１の内部へ設けることにより、電池パック１単体での短絡等の過大な電流が発生した際、ヒューズ素子３の溶断以前に電流遮断素子８を開放し、電池パックの発煙・焼損を防ぎ、ヒューズ素子３が溶断していないので短絡状態を解消することにより再び電池パック１を使用することができる。   Further, according to the battery pack of FIG. 2, by providing the current interrupting element 8 inside the battery pack 1, when an excessive current such as a short circuit occurs in the battery pack 1 alone, before the fuse element 3 is blown out. The current interrupting element 8 is opened to prevent the battery pack from being smoked and burned, and since the fuse element 3 is not blown, the battery pack 1 can be used again by eliminating the short-circuit state.

電流遮断素子８が故障し、ヒューズ素子３の定格を超える電流が流れた場合、ヒューズ素子３が溶断して電池の発火・発煙を防止することができる。   When the current interrupting element 8 breaks down and a current exceeding the rating of the fuse element 3 flows, the fuse element 3 is melted to prevent the battery from being ignited or smoked.

本発明の実施形態を示すブロック図。The block diagram which shows embodiment of this invention. 本発明の実施形態を示すブロック図。The block diagram which shows embodiment of this invention. 従来例の電池パックを示すブロック図。The block diagram which shows the battery pack of a prior art example.

符号の説明Explanation of symbols

１…電池セル
２…回路基板
３…ヒューズ素子
４…過電流検出回路
５…過電流検出抵抗
６…電池セル群
７…電動工具
８…電流遮断素子 DESCRIPTION OF SYMBOLS 1 ... Battery cell 2 ... Circuit board 3 ... Fuse element 4 ... Overcurrent detection circuit 5 ... Overcurrent detection resistor 6 ... Battery cell group 7 ... Electric tool 8 ... Current interruption element

Claims (3)

電池セルと、
前記電池セルと外部機器とを接続するものであって、前記外部機器との間で電流経路を形成する端子部と、
前記電流経路上に配されるヒューズと、
前記ヒューズの両端電圧を検出する電圧検出手段と、
前記電圧検出手段が検出した検出電圧に基づいて電流経路上の過電流を検出する過電流検出手段と、を備えたことを特徴とする電池パック。 A battery cell;
The battery cell and an external device are connected, and a terminal portion that forms a current path with the external device;
A fuse disposed on the current path;
Voltage detecting means for detecting a voltage across the fuse;
A battery pack comprising: overcurrent detection means for detecting an overcurrent on a current path based on a detection voltage detected by the voltage detection means. 前記過電流検出手段は、
前記電流経路上に配置される前記電流遮断素子に対して信号出力可能に構成されており、前記過電流を検出したときには前記電流遮断素子をオフするための信号を出力することを特徴とする請求項１に記載の電池パック。 The overcurrent detection means includes
A signal is outputable to the current interrupting element disposed on the current path, and a signal for turning off the current interrupting element is output when the overcurrent is detected. Item 6. The battery pack according to Item 1. 前記電流遮断素子を内部に備えることを特徴とする請求項２に記載の電池パック。   The battery pack according to claim 2, wherein the current interrupting element is provided inside.
JP2008143422A 2008-05-30 2008-05-30 Battery pack Withdrawn JP2009291045A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012016114A (en) * 2010-06-30 2012-01-19 Hitachi Koki Co Ltd Battery pack and electric tool using the same
JP2013062914A (en) * 2011-09-12 2013-04-04 Toyota Motor Corp Rotary drive device
JP2013066326A (en) * 2011-09-20 2013-04-11 Toyota Motor Corp Vehicle, and vehicle control method
JP2014147138A (en) * 2013-01-25 2014-08-14 Keihin Corp Storage battery system
CN115810811A (en) * 2022-01-07 2023-03-17 宁德时代新能源科技股份有限公司 Battery pack active fuse control device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012016114A (en) * 2010-06-30 2012-01-19 Hitachi Koki Co Ltd Battery pack and electric tool using the same
JP2013062914A (en) * 2011-09-12 2013-04-04 Toyota Motor Corp Rotary drive device
JP2013066326A (en) * 2011-09-20 2013-04-11 Toyota Motor Corp Vehicle, and vehicle control method
JP2014147138A (en) * 2013-01-25 2014-08-14 Keihin Corp Storage battery system
CN115810811A (en) * 2022-01-07 2023-03-17 宁德时代新能源科技股份有限公司 Battery pack active fuse control device
CN115810811B (en) * 2022-01-07 2023-08-18 宁德时代新能源科技股份有限公司 Active fuse control device for battery pack

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Effective date: 20110802