JP3792967B2 - Battery pack and power tool - Google Patents

Battery pack and power tool Download PDF

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JP3792967B2
JP3792967B2 JP32455099A JP32455099A JP3792967B2 JP 3792967 B2 JP3792967 B2 JP 3792967B2 JP 32455099 A JP32455099 A JP 32455099A JP 32455099 A JP32455099 A JP 32455099A JP 3792967 B2 JP3792967 B2 JP 3792967B2
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battery pack
terminal
terminals
charge
slide rails
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JP2001143678A (en
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陽一 加藤
和征 榊原
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Makita Corp
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Makita Corp
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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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • 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

Description

【０００１】
【発明の属する技術分野】
本発明は、蓄電池を内蔵するバッテリーパックと、そのバッテリーパックを電源として使用する電動工具に関する。
【０００２】
【従来の技術】
バッテリーパックは、蓄電池を収容するケースに、正負の充放電用端子と一対のスライドレールとを備えたものが、電動工具は、ハウジングに、正負の端子とスライドレールを抱持可能な一対のガイドレールとを備えたものが夫々知られており、バッテリーパック側のスライドレールを電動工具側のガイドレールに沿ってスライドさせることで、両レールを結合させてバッテリーパックを電動工具に装着可能となっている。このスライド結合と共に、正負の充放電用端子が電動工具の正負の端子と電気的接続するものである。
【０００３】
【発明が解決しようとする課題】
バッテリーパックにおいて、正負の充放電用端子は、端子間の距離が近すぎると短絡のおそれがある。又、端子の位置によっては、バッテリーパックを落としたり、逆に物をバッテリーパック上に落としたりすることで、端子が折れ等の損傷を起こすおそれもある。
この損傷のおそれは電動工具においても同様で、電動工具を落下したりすることで端子が折れ等を起こしやすい。
【０００４】
そこで、請求項１に記載の発明は、上記スライド結合において端子の短絡や損傷のおそれを効果的に低減でき、端子の保護効果が高いバッテリーパックを提供することを目的としたもので、請求項３に記載の発明は、同様に上記スライド結合において端子の損傷のおそれを効果的に低減できる電動工具を提供することを目的としたものである。
【０００５】
【課題を解決するための手段】
上記目的を達成するために、請求項１に記載の発明は、前記スライドレール間に、正負の充放電用端子を夫々前記スライドレールの内側へ近接するように所定間隔をおいて配置すると共に、他の電気機器の端子の進入路を除いて少なくとも充放電用端子を覆う保護部を形成したことを特徴とするものである。
請求項２に記載の発明は、請求項１の目的に加えて、充放電用端子以外に通信用端子を設けたものにおいて、同様にその保護を可能とすると共に、組み付けや配線を至便にするために、前記通信用端子を充放電用端子の間に配置したものである。
上記目的を達成するために、請求項３に記載の発明は、ハウジングに、請求項１又は２に記載のバッテリーパックのスライドレールを夫々外側から抱持可能な一対のガイドレールを平行に形成し、前記ガイドレール間に、前記バッテリーパックの装着と共に前記バッテリーパックの充放電用端子と電気的接続される正負の端子を設けてなる電動工具としたものである。
【０００６】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
図１はバッテリーパックの斜視図、図２はその分解斜視図で、バッテリーパック１は、複数の蓄電池（以下「セル」という）を内蔵した箱体であるが、ここでは、外ケース２内に、セルを覆う一回り小さい内ケース１３を収容した二重構造となっている。まず外ケース２は、内ケース１３が略収まる下ケース３と、下ケース３の上方からネジで被着される上ケース４とからなり、充電器や電動工具への共通の装着部となる上ケース４の上面には、基端部５と、その基端部５から所定間隔をおいて前方（以下バッテリーパック１では基端部５側を後方として説明する）へ突出する二本の平行なスライドレール６，６とを形成している。このスライドレール６，６は、夫々外方に張り出し部７，７を設けた断面逆Ｌ字状を呈し、両スライドレール６，６の間の基端部５には、スライドレール６と平行なスリット８，８・・が形成されている。又、上ケース４における基端部５の中央後方には、上ケース４を貫通する四角形の吸気口９が形成され、前方には、スライドレール６，６の間で形成した段部１０との境目で開口する排気口１１，１１・・が形成されている。１２，１２は、後述する電動工具への結合時に電動工具側のガイドレールの終端に当接するストッパである。
【０００７】
一方、内ケース１３は、５本ずつ４列に並べた２０本のセル１４，１４・・に上下から被着される合成樹脂製の上ホルダ１５及び下ホルダ１６と、上下ホルダ１５，１６の間に備えられる金属製で帯状の放熱板２２，２２・・とからなる。上下ホルダ１５，１６は、セル１４，１４・・の全体形状に合わせて形成されて各セル１４の安定が図られており、上ホルダ１５の下端周縁と、下ホルダ１６の上端周縁とには、下ケース３の内面形状に沿ったリブ１７，１８が形成されて、収容時の外ケース２内でのがたつきを防止している。又、ここでは、セル１４，１４・・は半数ずつ間隔をおいて二分割された格好で上下ホルダ１５，１６に収容されている（以下分割されたセル１４，１４・・の集まりを夫々「セル群」という）。
【０００８】
更に、下ホルダ１６の前後には、リブ１８より上方に突出して上ホルダ１５と結合される延設部１９，１９が形成されており、各セル群の外方側の放熱板２２，２２は、図３及び図５に示すように、前後方向の長手端部がリブ１７，１８とセル１４との間で、上下方向の短手端部が延設部１９とセル１４との間で夫々狭持されることで、上下ホルダ１５，１６間に固定されている。同様にセル群同士の間に設けられた放熱板２２，２２も、長手端部が、上下ホルダ１５，１６からセル群の間に突設された仕切板２０，２０とセル１４との間で、短手端部が延設部１９とセル１４との間で夫々狭持固定されている。尚、各放熱板２２は、セル群の外形状に沿った凹凸形状となって各列のセル１４，１４・・とは均等に接触し、外面には、図２，６に示すように、前端を揃えて後方へ向けて４本のフィン２３，２３・・が複数平行に形成されているが、これらのフィン２３，２３・・は、上の１本を除いて、下側の３本を段階的に長くして、放熱板２２の熱容量が前方へ行く程増えるように設定している。
【０００９】
よって、セル群は内ケース１３内で略密封状態で収容され、外ケース２内には、図５に斜線で示す如く、リブ１７，１８との間で内ケース１３を周回する空間と、その空間と連通して内ケース１３を前後に貫通する空間とが形成されるが、リブ１７の前後部分は切除されてこれらの空間が上ケース４の吸気口９及び排気口１１と連通しているため、バッテリーパック１内には、図６の矢印で示すように、吸気口９から進入した空気が左右に分かれて前方へ回り込み、排気口１１から外部へ出る通気路２４，２４と、内ケース１３を貫通して前方へ至り、排気口１１から外部へ出る第２通気路２５とが分岐形成されることになる。尚、前方の延設部１９には、第２通気路２５の両側で上下方向に整流板２１，２１が突設されて、通気路２４，２４と第２通気路２５とを流れる空気流を夫々単独で排気口１１へ案内している。
尚、２６は内ケース１３の下面と下ケース３の内面との間に敷設されるラバーシート、２７，２７はセル群と下ホルダ１６との間に敷設されるスポンジシート、２８，２８は絶縁板で、バッテリーパック１の後方で外ケース２には、コイルバネ２９で上方へ付勢され、上ケース４から爪３１を突出させるフック３０が設けられている。
【００１０】
又、上ホルダ１５の上面後方には、基板３２がネジ４１によってネジ止めされる（図２〜４及び図６）。基板３２上には、左右に充放電用端子３３，３３が配置されて、リード板３４，３４によって上ホルダ１５越しに露出されたセル群両端の正負の極と夫々電気的接続されている。更に、基板３２における充放電用端子３３，３３の間には、通信用端子としての温度検出用端子３５とコネクタ端子３６とが夫々配置されて、充電器との通信回路を形成しており、外ケース２への収容状態では、充放電用端子３３，３３と温度検出用端子３５とが上ケース４のスリット８，８・・を介して外部へ臨み、コネクタ端子３６が前方へ向けて露出するが、充放電用端子３３，３３は、夫々一方ずつがスライドレール６の内側で近接するようにスリット８，８と共に所定間隔をおいて配置されている。尚、充放電用端子３３，３３は、電動工具へ装着した際に必要な接圧が得られるように、温度検出用端子３５より長く形成されている。
【００１１】
そして、温度検出用端子３５に接続されるサーモスタット３７は、図２に示すように上ホルダ１５前方の透孔３８からリード線３９（一方のリード線３９はセル間のリード板４６に接続される）を介して下方へ垂下され、下ホルダ１６への組み付け状態では、セル１４と前方の延設部１９との間に挿入されてセル１４と密着状態となる。同様に、基板３２に接続されるサーミスタ４２，４２も、上ホルダ１５後方の透孔４３，４３からリード線４４，４４を介して下方へ垂下され、下ホルダ１６への組み付け状態では、セル１４と後方の延設部１９との間に挿入されてセル１４と密着状態となる。尚、延設部１９の内面には、成形時の抜き勾配による傾斜面４０，４５が付与されているため、サーモスタット３７及びサーミスタ４２の挿入に伴いサーモスタット３７及びサーミスタ４２がセル１４側へ押圧されることになる。
【００１２】
以上の如く構成されたバッテリーパック１は、組み付け状態では、上ケース４におけるスライドレール６，６のすぐ内側のスリット８，８に正負の充放電用端子３３，３３が、その間のスリット８に温度検出用端子３５が夫々臨み、コネクタ端子３６も充放電用端子８，８の間に位置する。よって、大電流が流れる充放電用端子３３，３３間の間隔が広くなり、短絡のおそれは小さくなる。又、各充放電用端子３３は夫々スライドレール６のすぐ内側に位置するから、外側をスライドレール６によって保護される格好となり、バッテリーパック１を落下させたり、物を上ケース４上に落としたりしても各充放電用端子３３が損傷するおそれは小さくなる。
【００１３】
一方、図７はバッテリーパック１を充電器と同様にスライド結合する電動工具５０のハンドル５１の説明図で、ハンドル５１の下端両側には、バッテリーパック１のスライドレール６，６を夫々外側から抱持するガイドレール５２，５２が形成され、各ガイドレール５２，５２の内側下縁の略全長に張り出し部５３，５３が延設されて、ガイドレール５２，５２の間には、バッテリーパック１の充放電用端子３３，３３と同じ間隔をおいた正負の端子板５５，５５をガイドレール５２，５２と平行に突設した端子台５４が配置されている。５６は装着時にフック３０の爪３１が係止する係止凹部である。
よって、バッテリーパック１のスライドレール６，６をハンドル５１のガイドレール５２，５２間にあてがってスライドさせると、図８のように、ガイドレール５２，５２にスライドレール６，６を外側から抱持させることができ、装着と同時に端子台５４の端子板５５，５５がバッテリーパック１のスリット８，８に進入して充放電用端子３３，３３と電気的接続する。特にここでは、バッテリーパック１側の充放電用端子３３，３３に対応する端子台５４の端子板５５，５５の間隔も当然広くなり、その分ガイドレール５２，５２に近接した状態となるため、各端子板５５の外側がガイドレール５２で保護される格好となり、バッテリーパック１を装着しない電動工具５０でも各端子板５５の損傷のおそれを低減可能となる。
【００１４】
又、ハンドル５１の底面における一方のガイドレール５２の近傍には、ガイドレール５２と直交する方向でストッパ５７が立設され、対応するバッテリーパック１側のスライドレール６の上面には、スライドレール６に沿ってリブ４７が立設されている。このリブ４７とストッパ５７とは、電動工具５０に適合した電圧のバッテリーパック１の装着時には、互いに干渉せず、バッテリーパック１のスライドを許容するが、リブ４７は、バッテリーパック１の電圧が大きくなるほど左右方向の幅が大きくなるように、逆にストッパ５７は、電圧ごとに幅が大きくなるリブ４７に合わせて左右方向の長さが短くなるように形成されている。従って、電動工具５０が許容する電圧より大きいバッテリーパックを装着しようとしても、リブ４７がストッパ５７に当接してスライドレール６の進入を阻止し、誤装着によるモータの焼損等を防止できるようになっている。尚、許容する電圧より小さいバッテリーパックでは幅が小さいリブとなるため装着可能で（モータ焼損のおそれがないから）、充電器へはストッパが設けられないため電圧に関係なく装着可能となっている。
【００１５】
このように上記形態によれば、バッテリーパック１の充放電用端子３３，３３を、充電器や電動工具にスライド結合させるスライドレール６，６の間で夫々スライドレール６の内側へ近接するように所定間隔をおいて配置したことで、端子間の短絡や損傷のおそれが効果的に低減される。
又、温度検出用端子３５とコネクタ端子３６とを充放電用端子３３，３３の間に配置しているから、同様にスライドレール６，６による保護が得られると共に、これらの小電流用の端子が集中して組み付けや配線にも至便となる。
更にここでは、スライドレール６，６間に、相手側の端子の進入路となるスリット８を除いて充放電用端子３３と温度検出用端子３５とを覆う保護部としての基端部５が形成されているから、各充放電用端子３３と温度検出用端子３５とが上方からも保護され、端子の保護効果はより高まる。
【００１６】
そして、バッテリーパック１が装着される電動工具５０側でも同様に、バッテリーパック１のスライドレール６，６を外側から抱持するガイドレール５２，５２により端子板５５，５５が保護されるため、バッテリーパック１を装着しない状態でも端子板５５，５５の損傷のおそれが効果的に低減されるのである。
尚、端子やスライドレールの形状は上記形態に限定するものでなく、接続形態に合わせて適宜変更可能で、保護部も、上記形態のようにスライドレール６，６と基端部５とが一体形成される構造とせず、スライドレール間で保護部を独立して形成したり、充放電用端子のみを覆う保護部を形成したりしても差し支えない。その他通信用端子がないバッテリーパックでも本発明は適用可能である。
【００１７】
【発明の効果】
請求項１に記載のバッテリーパックによれば、スライドレール間に、正負の充放電用端子を夫々が前記スライドレールの内側へ近接するように所定間隔をおいて配置したことで、端子間の間隔が広がって短絡のおそれが解消されると共に、スライドレールによる保護が得られて損傷のおそれが効果的に低減される。また、保護部を形成したことで、端子の保護効果をより高めることができる。
請求項２に記載のバッテリーパックによれば、請求項１の効果に加えて、通信用端子を充放電用端子の間に配置したことで、同様にスライドレールによる保護が得られると共に、通信用端子が集中して組み付けや配線に至便となる。
請求項３に記載の電動工具によれば、ハウジングに、バッテリーパックのスライドレールを夫々外側から抱持可能な一対のガイドレールを平行に形成し、前記ガイドレール間に正負の端子を設けたことで、ガイドレールにより正負の端子が保護され、バッテリーパックを装着しない状態でも端子の損傷のおそれが効果的に低減される。
【図面の簡単な説明】
【図１】バッテリーパックの斜視図である。
【図２】バッテリーパックの分解斜視図である。
【図３】バッテリーパックの断面図である。
【図４】上ケースを取り外した状態のバッテリーパックの平面図である。
【図５】上ケースと上ホルダとを取り外した状態のバッテリーパックの平面図である。
【図６】内ケースの斜視図である。
【図７】（Ａ）電動工具のハンドルの側面説明図である。
（Ｂ）電動工具のハンドルの底面説明図である。
【図８】電動工具にバッテリーパックを装着した状態を示す説明図である。
【符号の説明】
１・・バッテリーパック、２・・外ケース、５・・基端部、６・・スライドレール、９・・吸気口、１１・・排気口、１３・・内ケース、１４・・セル、１５・・上ホルダ、１６・・下ホルダ、２２・・放熱板、２３・・フィン、２４・・通気路、２５・・第２通気路、３２・・基板、３３・・充放電用端子、３５・・温度検出用端子、３６・・コネクタ端子、４７・・リブ、５０・・電動工具、５１・・ハンドル、５２・・ガイドレール、５４・・端子台、５５・・端子板、５７・・ストッパ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery pack incorporating a storage battery and an electric tool using the battery pack as a power source.
[0002]
[Prior art]
A battery pack includes a case for storing a storage battery and a positive / negative charging / discharging terminal and a pair of slide rails. A power tool is a pair of guides that can hold a positive / negative terminal and a slide rail in a housing. Each is equipped with a rail, and by sliding the slide rail on the battery pack side along the guide rail on the power tool side, it becomes possible to attach both the rails and attach the battery pack to the power tool ing. Along with this slide coupling, the positive / negative charge / discharge terminals are electrically connected to the positive / negative terminals of the power tool.
[0003]
[Problems to be solved by the invention]
In the battery pack, the positive and negative charge / discharge terminals may be short-circuited if the distance between the terminals is too short. Further, depending on the position of the terminal, dropping the battery pack or conversely dropping an object on the battery pack may cause damage such as breakage of the terminal.
The risk of damage is also the same in the electric tool, and the terminal is easily broken by dropping the electric tool.
[0004]
Accordingly, an object of the present invention is to provide a battery pack that can effectively reduce the risk of short-circuiting or damage of terminals in the slide coupling and has a high terminal protection effect. Similarly, the invention described in No. 3 aims to provide an electric tool that can effectively reduce the risk of damage to the terminal in the slide coupling.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, between the slide rails, positive and negative charge / discharge terminals are arranged at predetermined intervals so as to be close to the inside of the slide rail , respectively. The protective part which covers at least the terminal for charging / discharging except the approach path of the terminal of another electric equipment is formed .
In addition to the object of claim 1, the invention described in claim 2 is provided with a communication terminal in addition to the charging / discharging terminal, and similarly enables protection thereof and facilitates assembly and wiring. Therefore, the communication terminal is arranged between the charge / discharge terminals.
In order to achieve the above object, according to a third aspect of the present invention, a pair of guide rails capable of holding the slide rails of the battery pack according to the first or second aspect from the outside are formed in parallel on the housing. The power tool is provided with positive and negative terminals electrically connected to the charge / discharge terminals of the battery pack along with the mounting of the battery pack between the guide rails.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a battery pack, FIG. 2 is an exploded perspective view thereof, and the battery pack 1 is a box containing a plurality of storage batteries (hereinafter referred to as “cells”). It has a double structure in which a slightly smaller inner case 13 covering the cell is accommodated. First, the outer case 2 is composed of a lower case 3 in which the inner case 13 is substantially accommodated and an upper case 4 that is attached by screws from above the lower case 3, and serves as a common mounting portion for a charger or electric tool. On the upper surface of the case 4, there are a base end portion 5, and two parallel projections that project forward from the base end portion 5 at a predetermined interval (hereinafter, the base end portion 5 side will be described as the rear in the battery pack 1). The slide rails 6 and 6 are formed. The slide rails 6 and 6 have an inverted L-shaped cross section provided with projecting portions 7 and 7 on the outside, respectively, and a base end portion 5 between the slide rails 6 and 6 is parallel to the slide rail 6. Slits 8, 8,... Are formed. Further, a rectangular intake port 9 penetrating the upper case 4 is formed at the center rear of the base end portion 5 in the upper case 4, and a step portion 10 formed between the slide rails 6 and 6 is formed in the front. Exhaust ports 11, 11,... Opening at the boundary are formed. Reference numerals 12 and 12 denote stoppers that come into contact with the terminal end of the guide rail on the power tool side when coupled to the power tool described later.
[0007]
On the other hand, the inner case 13 is composed of an upper holder 15 and a lower holder 16 made of synthetic resin and attached to the 20 cells 14, 14. It is made of metal and has a belt-like heat sink 22, 22. The upper and lower holders 15, 16 are formed in accordance with the overall shape of the cells 14, 14... To stabilize each cell 14, and the lower end periphery of the upper holder 15 and the upper end periphery of the lower holder 16 are The ribs 17 and 18 are formed along the inner surface shape of the lower case 3 to prevent rattling in the outer case 2 during housing. Further, here, the cells 14, 14,... Are accommodated in the upper and lower holders 15, 16 in the form of being divided into two at half intervals (hereinafter, a group of the divided cells 14, 14,. Cell group)).
[0008]
Further, extending portions 19 and 19 are formed on the front and rear sides of the lower holder 16 so as to protrude upward from the ribs 18 and to be coupled to the upper holder 15. 3 and 5, the longitudinal end portion in the front-rear direction is between the ribs 17 and 18 and the cell 14, and the short end portion in the up-and-down direction is between the extension portion 19 and the cell 14, respectively. It is fixed between the upper and lower holders 15 and 16 by being pinched. Similarly, the heat sinks 22 and 22 provided between the cell groups also have longitudinal end portions between the partition plates 20 and 20 and the cells 14 projecting between the cell groups from the upper and lower holders 15 and 16. The short end portions are nipped and fixed between the extended portion 19 and the cell 14, respectively. In addition, each heat sink 22 becomes uneven | corrugated shape along the outer shape of a cell group, and it contacts with the cell 14,14 ... of each row | line | column, and as shown to FIG. A plurality of four fins 23, 23,... Are formed in parallel with the front end toward the rear, but these fins 23, 23,. Is set so that the heat capacity of the heat radiating plate 22 increases toward the front.
[0009]
Therefore, the cell group is accommodated in a substantially sealed state in the inner case 13, and the outer case 2 has a space around the inner case 13 between the ribs 17 and 18, as shown by hatching in FIG. A space that communicates with the space and penetrates the inner case 13 in the front-rear direction is formed. However, the front and rear portions of the rib 17 are cut away so that these spaces communicate with the intake port 9 and the exhaust port 11 of the upper case 4. Therefore, in the battery pack 1, as shown by the arrows in FIG. 6, the air that has entered from the intake port 9 is divided into left and right, circulates forward, and vents 24, 24 that exit from the exhaust port 11 to the outside, and the inner case The second air passage 25 that penetrates through 13 and moves forward and exits from the exhaust port 11 is branched. The front extending portion 19 is provided with rectifying plates 21 and 21 projecting vertically on both sides of the second air passage 25 so that the air flow flowing through the air passages 24 and 24 and the second air passage 25 is generated. Each guides alone to the exhaust port 11.
In addition, 26 is a rubber sheet laid between the lower surface of the inner case 13 and the inner surface of the lower case 3, 27 and 27 are sponge sheets laid between the cell group and the lower holder 16, and 28 and 28 are insulated. A hook 30 is provided on the outer case 2 behind the battery pack 1 and is biased upward by a coil spring 29 so that the claw 31 protrudes from the upper case 4.
[0010]
Further, the substrate 32 is screwed to the back of the upper surface of the upper holder 15 by screws 41 (FIGS. 2 to 4 and FIG. 6). On the substrate 32, charging / discharging terminals 33, 33 are arranged on the left and right sides, and are electrically connected to the positive and negative electrodes at both ends of the cell group exposed through the upper holder 15 by the lead plates 34, 34, respectively. Further, between the charge / discharge terminals 33, 33 on the substrate 32, a temperature detection terminal 35 and a connector terminal 36 as communication terminals are respectively arranged to form a communication circuit with the charger. In the housing state in the outer case 2, the charge / discharge terminals 33 and 33 and the temperature detection terminal 35 face the outside through the slits 8, 8... Of the upper case 4, and the connector terminal 36 is exposed forward. However, the charging / discharging terminals 33, 33 are arranged with a predetermined interval together with the slits 8, 8 so that each one is close to the inside of the slide rail 6. The charging / discharging terminals 33 and 33 are formed longer than the temperature detecting terminal 35 so that a necessary contact pressure can be obtained when the terminal is mounted on the electric tool.
[0011]
As shown in FIG. 2, the thermostat 37 connected to the temperature detection terminal 35 is connected to a lead wire 39 (one lead wire 39 is connected to a lead plate 46 between cells) from a through hole 38 in front of the upper holder 15. ) And is inserted between the cell 14 and the extending portion 19 in the front to be in close contact with the cell 14. Similarly, the thermistors 42, 42 connected to the substrate 32 are also suspended downward from the through holes 43, 43 behind the upper holder 15 via the lead wires 44, 44, and in the assembled state to the lower holder 16, the cell 14. And the rear extending portion 19 to be in close contact with the cell 14. In addition, since the inclined surfaces 40 and 45 by the draft at the time of shaping | molding are provided in the inner surface of the extension part 19, the thermostat 37 and the thermistor 42 are pressed to the cell 14 side with insertion of the thermostat 37 and the thermistor 42. Will be.
[0012]
In the assembled state, the battery pack 1 configured as described above has positive and negative charge / discharge terminals 33 and 33 in the slits 8 and 8 immediately inside the slide rails 6 and 6 in the upper case 4, and the temperature in the slit 8 between them. The detection terminals 35 face each other, and the connector terminal 36 is located between the charge / discharge terminals 8 and 8. Therefore, the interval between the charging / discharging terminals 33, 33 through which a large current flows is widened, and the risk of short circuit is reduced. Further, since each charging / discharging terminal 33 is located immediately inside the slide rail 6, the outer side is protected by the slide rail 6, and the battery pack 1 is dropped or an object is dropped on the upper case 4. Even so, the risk of damage to each charge / discharge terminal 33 is reduced.
[0013]
On the other hand, FIG. 7 is an explanatory view of the handle 51 of the electric tool 50 for slidingly connecting the battery pack 1 in the same manner as the charger. The slide rails 6 and 6 of the battery pack 1 are respectively held from the outside on both sides of the lower end of the handle 51. Guide rails 52 and 52 are formed, and overhanging portions 53 and 53 are extended substantially along the entire inner lower edge of each guide rail 52 and 52, and the battery pack 1 is interposed between the guide rails 52 and 52. A terminal block 54 is provided in which positive and negative terminal plates 55, 55 having the same spacing as the charge / discharge terminals 33, 33 are projected in parallel to the guide rails 52, 52. Reference numeral 56 denotes a locking recess for locking the claw 31 of the hook 30 when mounted.
Therefore, when the slide rails 6 and 6 of the battery pack 1 are placed and slid between the guide rails 52 and 52 of the handle 51, the slide rails 6 and 6 are held from the outside to the guide rails 52 and 52 as shown in FIG. Simultaneously with the mounting, the terminal plates 55 and 55 of the terminal block 54 enter the slits 8 and 8 of the battery pack 1 and are electrically connected to the charging and discharging terminals 33 and 33. In particular, here, the interval between the terminal plates 55 and 55 of the terminal block 54 corresponding to the charging and discharging terminals 33 and 33 on the battery pack 1 side is naturally widened, and accordingly, the state becomes closer to the guide rails 52 and 52. The outer side of each terminal plate 55 is protected by the guide rail 52, and even the electric tool 50 without the battery pack 1 can reduce the risk of damage to each terminal plate 55.
[0014]
A stopper 57 is erected in the direction perpendicular to the guide rail 52 near the one guide rail 52 on the bottom surface of the handle 51, and the slide rail 6 is disposed on the upper surface of the corresponding slide rail 6 on the battery pack 1 side. A rib 47 is erected along. The rib 47 and the stopper 57 do not interfere with each other and allow the battery pack 1 to slide when the battery pack 1 having a voltage suitable for the electric power tool 50 is mounted, but the rib 47 has a large voltage of the battery pack 1. On the contrary, the stopper 57 is formed so that the length in the left-right direction is shortened in accordance with the rib 47 whose width increases for each voltage so that the width in the left-right direction increases. Therefore, even if an attempt is made to mount a battery pack that is larger than the voltage allowed by the electric power tool 50, the rib 47 abuts against the stopper 57 to prevent the slide rail 6 from entering, and the motor can be prevented from being burned out due to erroneous mounting. ing. A battery pack smaller than the allowable voltage can be mounted because the rib has a small width (since there is no risk of motor burnout), and a charger is not provided with a stopper, so it can be mounted regardless of the voltage. .
[0015]
As described above, according to the embodiment, the charging / discharging terminals 33 and 33 of the battery pack 1 are close to the inside of the slide rail 6 between the slide rails 6 and 6 that are slidably coupled to the charger and the electric tool. By arranging them at a predetermined interval, the possibility of short circuit or damage between terminals is effectively reduced.
Further, since the temperature detection terminal 35 and the connector terminal 36 are disposed between the charge / discharge terminals 33, 33, protection by the slide rails 6, 6 can be obtained in the same manner, and these small current terminals are also provided. Concentrate will be convenient for assembly and wiring.
Further, here, a base end portion 5 is formed between the slide rails 6 and 6 as a protective portion that covers the charging / discharging terminal 33 and the temperature detecting terminal 35 except for the slit 8 serving as an entry path for the mating terminal. Therefore, the charge / discharge terminals 33 and the temperature detection terminals 35 are also protected from above, and the protection effect of the terminals is further enhanced.
[0016]
Similarly, on the side of the electric tool 50 to which the battery pack 1 is mounted, the terminal plates 55 and 55 are protected by the guide rails 52 and 52 that hold the slide rails 6 and 6 of the battery pack 1 from the outside. Even when the pack 1 is not mounted, the risk of damage to the terminal plates 55, 55 is effectively reduced.
The shape of the terminal or slide rail is not limited to the above form, but can be changed as appropriate according to the connection form, and the protection rails are integrated with the slide rails 6 and 6 and the base end part 5 as in the above form. The protective part may be formed independently between the slide rails, or the protective part that covers only the charge / discharge terminals may be formed without forming the structure. The present invention can also be applied to a battery pack having no other communication terminal.
[0017]
【The invention's effect】
According to the battery pack of claim 1, the positive and negative charging / discharging terminals are arranged at a predetermined interval between the slide rails so as to be close to the inside of the slide rail. Spreads to eliminate the possibility of a short circuit, and provides protection by a slide rail, effectively reducing the risk of damage. Moreover, the protective effect of a terminal can be heightened more by having formed the protection part.
According to the battery pack of the second aspect, in addition to the effect of the first aspect, the communication terminal is disposed between the charging / discharging terminals in addition to the protection by the slide rail, and for communication. Concentrated terminals are convenient for assembly and wiring.
According to the third aspect of the present invention , a pair of guide rails that can hold the slide rails of the battery pack from the outside are formed in parallel in the housing, and positive and negative terminals are provided between the guide rails. Thus, the positive and negative terminals are protected by the guide rail, and the possibility of damage to the terminals is effectively reduced even when the battery pack is not attached.
[Brief description of the drawings]
FIG. 1 is a perspective view of a battery pack.
FIG. 2 is an exploded perspective view of a battery pack.
FIG. 3 is a cross-sectional view of a battery pack.
FIG. 4 is a plan view of the battery pack with the upper case removed.
FIG. 5 is a plan view of the battery pack with the upper case and the upper holder removed.
FIG. 6 is a perspective view of an inner case.
FIG. 7A is an explanatory side view of the handle of the electric tool.
(B) It is bottom face explanatory drawing of the handle | steering_wheel of an electric tool.
FIG. 8 is an explanatory view showing a state where a battery pack is mounted on the electric tool.
[Explanation of symbols]
1 .... Battery pack, 2 .... Outer case, 5 .... Base end, 6 .... Slide rail, 9 .... Intake port, 11 .... Exhaust port, 13 .... Inner case, 14 .... Cell, 15 .... -Upper holder, 16-Lower holder, 22-Heat sink, 23-Fin, 24-Air passage, 25-Second air passage, 32-Board, 33-Charge / discharge terminal, 35・ Temperature detection terminal, 36 ..Connector terminal, 47 ..Rib, 50 ..Electric tool, 51 ..Handle, 52 ..Guide rail, 54 ..Terminal block, 55 ..Terminal plate, 57. .

Claims (3)

蓄電池を収容するケースに、他の電気機器へ着脱可能な一対のスライドレールを所定間隔をおいて平行に形成したバッテリーパックであって、
前記スライドレール間に、正負の充放電用端子を夫々前記スライドレールの内側へ近接するように所定間隔をおいて配置すると共に、前記他の電気機器の端子の進入路を除いて少なくとも前記充放電用端子を覆う保護部を形成したことを特徴とするバッテリーパック。A battery pack in which a pair of slide rails that can be attached to and detached from other electrical devices are formed in parallel at a predetermined interval in a case that houses a storage battery,
Between the slide rails, positive and negative charge / discharge terminals are arranged at a predetermined interval so as to be close to the inside of the slide rail, respectively, and at least the charge / discharge except for the entry path of the terminal of the other electric device. A battery pack characterized in that a protective portion for covering the terminal for use is formed . 通信用端子を設けたものにおいては、前記通信用端子を充放電用端子の間に配置した請求項１に記載のバッテリーパック。  The battery pack according to claim 1, wherein the communication terminal is disposed between the charge / discharge terminals when the communication terminal is provided. ハウジングに、請求項１又は２に記載のバッテリーパックのスライドレールを夫々外側から抱持可能な一対のガイドレールを平行に形成し、前記ガイドレール間に、前記バッテリーパックの装着と共に前記バッテリーパックの充放電用端子と電気的接続される正負の端子を設けてなる電動工具。 A pair of guide rails capable of holding the slide rails of the battery pack according to claim 1 or 2 from the outside are formed in parallel in the housing, and the battery pack is mounted between the guide rails together with the mounting of the battery pack. An electric tool provided with positive and negative terminals that are electrically connected to charge / discharge terminals .
JP32455099A 1999-11-15 1999-11-15 Battery pack and power tool Expired - Lifetime JP3792967B2 (en)

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DE20023629U DE20023629U1 (en) 1999-11-15 2000-11-14 Battery pack for use in power tool, has pair of slide rails with preset interval between them, so that charging-discharging terminals are provided to inner side of the respective slide rails
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