JP2006302759A

JP2006302759A - Battery pack for cordless tool

Info

Publication number: JP2006302759A
Application number: JP2005125297A
Authority: JP
Inventors: Hideki Ishida; 英樹石田; Masato Sakai; 正登坂井
Original assignee: Hitachi Koki Co Ltd
Current assignee: Koki Holdings Co Ltd
Priority date: 2005-04-22
Filing date: 2005-04-22
Publication date: 2006-11-02
Anticipated expiration: 2025-04-22
Also published as: JP4967248B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack for a tool capable of suppressing temperature rise in high voltage, miniaturization and charging. <P>SOLUTION: This battery pack is so structured that a plurality of element batteries 15 connected in series to each other are stored in a battery case 14; the battery case 14 is composed of an insertion part partially inserted into a handle part of the tool and a non-insertion part located beside the insertion part without being inserted into the handle part; and its power is supplied to the tool. The longitudinal direction of the element batteries 15a housed in the insertion part is so arranged as to be oriented in the same direction as that of the handle part; and the longitudinal direction of the element batteries 15b housed in the non-insertion part is so arranged as to be oriented in a direction nearly perpendicular to the handle part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明はコードレス工具用電池パックに関するものである。以下コードレス工具を単に工具という。 The present invention relates to a battery pack for a cordless tool. Hereinafter, the cordless tool is simply referred to as a tool.

特許文献１の従来の工具及び特許文献１開示の電池パックをアレンジした工具用電池パックを、図８及び図９を用いて説明する。図８に示す電池パック１３は、周知の如く、例えばニッケル水素又はニッケルカドミウムからなり、直列接続された複数の素電池１９を上ケース１４ａ、１４ｃ及び下ケース１４ｂからなる電池ケース１４内に収容することにより構成されている。なお１６はラッチ、１７は充放電用端子である。 A conventional tool of Patent Document 1 and a battery pack for a tool in which the battery pack disclosed in Patent Document 1 is arranged will be described with reference to FIGS. 8 and 9. As is well known, the battery pack 13 shown in FIG. 8 is made of, for example, nickel hydride or nickel cadmium, and accommodates a plurality of unit cells 19 connected in series in a battery case 14 including upper cases 14a and 14c and a lower case 14b. It is constituted by. Reference numeral 16 denotes a latch, and 17 denotes a charge / discharge terminal.

電池パック１３は図９に示す工具１のハンドル部１０の下端部に着脱可能に取付けられる。図９において工具１はインパクトドライバの例を示し、ハウジング２、ハンマケース３、アンビル４、モータ部５、減速部６、スピンドル７、ハンマ８、これらハンマケース３〜ハンマ８を収容した胴体部９、ハンドル部１０等から構成される。なお１１はハウジング２に設けられた風窓、１２はトリガスイッチである。工具１は、周知の如く、アンビル４の先端にドライバ等の先端工具を取付けてねじ等を締め付ける。 The battery pack 13 is detachably attached to the lower end portion of the handle portion 10 of the tool 1 shown in FIG. In FIG. 9, the tool 1 shows an example of an impact driver, and includes a housing 2, a hammer case 3, an anvil 4, a motor part 5, a speed reduction part 6, a spindle 7, a hammer 8, and a body part 9 containing these hammer cases 3 to 8. And the handle portion 10 and the like. In addition, 11 is a wind window provided in the housing 2, and 12 is a trigger switch. As is well known, the tool 1 attaches a tip tool such as a screwdriver to the tip of the anvil 4 and tightens a screw or the like.

特開２００３−５３６８３号公報JP 2003-53683 A

電池パック１３は、高電圧化を図るために電池ケース１４内に収容する素電池１９の個数が増え、大形化しているのが現状である。このような電池パック１３を工具１に取り付けると、電池パック１３を含めた総重量が増えて使いにくくなる。 The battery pack 13 is currently being increased in size by increasing the number of unit cells 19 accommodated in the battery case 14 in order to increase the voltage. When such a battery pack 13 is attached to the tool 1, the total weight including the battery pack 13 increases, and it becomes difficult to use.

かかる観点から、従来のニッケル水素電池等に比べて約３倍の電圧を有するリチウムイオン電池からなる電池パックを採用した工具が提案されつつある。リチウムイオン電池で構成することにより、同じ公称電圧でより軽量な電池パック１３を提供することが可能となるが、リチウムイオン電池の縦方向の長さがニッケル水素電池の約１．５倍もあるため、従来の電池パック１３と同様に素電池１９を縦方向に積み重ねて配置すると電池パック１３の全高が高くなる。このような電池パック１３を工具１に取り付けると、全高が高くなりバランスが悪くなる。 From this point of view, a tool employing a battery pack made of a lithium ion battery having a voltage about three times that of a conventional nickel metal hydride battery or the like is being proposed. By using a lithium ion battery, it becomes possible to provide a lighter battery pack 13 with the same nominal voltage, but the length of the lithium ion battery in the vertical direction is about 1.5 times that of a nickel metal hydride battery. Therefore, when the unit cells 19 are stacked in the vertical direction as in the conventional battery pack 13, the total height of the battery pack 13 is increased. When such a battery pack 13 is attached to the tool 1, the overall height is increased and the balance is deteriorated.

又工具１のハンドル部１０は、操作者が把持した時の手首の角度に合うように、胴体部９に対して５°〜２０°傾いている。このような工具１に対して、電池パック１３を工具１のハンドル部１０内に挿入してハンドル部１０の軸と平行な向きに取付けて、電池パック１３の底面を下にした状態で立たせると、工具１の胴体部９は水平線に対して５°〜２０°上向きに傾くため、使いにくくなる。 Further, the handle portion 10 of the tool 1 is inclined by 5 ° to 20 ° with respect to the body portion 9 so as to match the angle of the wrist when the operator holds it. With respect to such a tool 1, the battery pack 13 is inserted into the handle portion 10 of the tool 1 and attached in a direction parallel to the axis of the handle portion 10 so that the battery pack 13 is faced down. Since the body portion 9 of the tool 1 is inclined upward by 5 ° to 20 ° with respect to the horizontal line, it becomes difficult to use.

又電池パック１３の高電圧化や充電時間の短縮化等に伴い、充電時に素電池１９が発する熱が高くなってきた。熱対策として電池ケース１４に風窓を設けた冷却付電池パックも提案されているが、電池ケース１４内に熱を吸収する空間が少ないため、温度上昇を抑えることが難しい。 Further, with the increase in voltage of the battery pack 13 and the shortening of the charging time, the heat generated by the unit cells 19 during charging has increased. As a heat countermeasure, a battery pack with cooling provided with a wind window in the battery case 14 has been proposed, but it is difficult to suppress an increase in temperature because there is little space in the battery case 14 to absorb heat.

本発明の目的は、上記した欠点をなくし、高電圧・小形化及び充電時の温度上昇を抑えることが可能な工具用電池パックを提供することである。 An object of the present invention is to provide a battery pack for a tool that eliminates the above-described drawbacks and can suppress a high voltage, a small size, and a temperature rise during charging.

上記目的は、直列接続された複数の素電池を電池ケース内に収容し、電池ケースを工具のハンドル部内に一部が挿入される挿入部及び挿入部の側方に位置してハンドル部内に挿入されない非挿入部より構成し、工具に給電する電池パックであって、前記挿入部に収容される素電池の長手方向をハンドル部と同じ方向に向くように配置し、非挿入部に収容される素電池の長手方向をハンドル部とほぼ直角の方向に向くように配置することにより達成される。 The above purpose is to accommodate a plurality of unit cells connected in series in a battery case, and insert the battery case into the handle part positioned at the side of the insertion part where the battery case is partially inserted into the handle part of the tool. A battery pack configured to be supplied from a non-insertion portion and supplying power to the tool, wherein the longitudinal direction of the unit cell accommodated in the insertion portion is arranged in the same direction as the handle portion, and is accommodated in the non-insertion portion This is achieved by arranging the unit cells so that the longitudinal direction of the unit cells is oriented substantially perpendicular to the handle portion.

本発明によれば、電池パックの高さを低くすることが可能となり、結果として工具の高さも低くなるので、工具の使い勝手がよくなる。 According to the present invention, it is possible to reduce the height of the battery pack, and as a result, the height of the tool is also reduced, thereby improving the usability of the tool.

本発明の実施の形態による工具用電池パックの一例を、図１〜図７を用いて説明する。 An example of a battery pack for tools according to an embodiment of the present invention will be described with reference to FIGS.

図３は、本発明電池パックに使用するリチウムイオン電池１５とニッケル水素電池１９との大きさの比較を示す図である。リチウムイオン電池１５の高さＨ１、直径Ｄ１及び重さはそれぞれ約６５ｍｍ、約１８ｍｍ及び約４６ｇである。ニッケル水素電池１９の高さＨ２、直径Ｄ２及び重さはそれぞれ約４３ｍｍ、約２３ｍｍ及び約５５ｇである。又リチウムイオン電池１５の公称電圧は約３．６Ｖ、ニッケル水素電池１９の公称電圧は約１．２Ｖである。従って、例えば１４.４Ｖの電池パックとするには、リチウム素電池１５は４個必要とし、ニッケル水素電池１９は１２個必要とする。 FIG. 3 is a diagram showing a comparison in size between the lithium ion battery 15 and the nickel metal hydride battery 19 used in the battery pack of the present invention. The height H1, the diameter D1, and the weight of the lithium ion battery 15 are about 65 mm, about 18 mm, and about 46 g, respectively. The height H2, the diameter D2, and the weight of the nickel metal hydride battery 19 are about 43 mm, about 23 mm, and about 55 g, respectively. The nominal voltage of the lithium ion battery 15 is about 3.6V, and the nominal voltage of the nickel metal hydride battery 19 is about 1.2V. Therefore, for example, to make a 14.4V battery pack, four lithium unit cells 15 are required and twelve nickel metal hydride batteries 19 are required.

図１はこの１４.４Ｖの電池パック１３を示し、ハンドル部１０内に挿入される上ケース１４ａの一部及び下ケース１４ｂの一部から構成される挿入部には長手方向がハンドル部１０と同じ方向に向いた素電池１５ａが２個配置され、上ケース１４ａ、１４ｃ及び下ケース１４ｂにより構成される非挿入部には長手方向がハンドル部１０とほぼ直角の方向に向いた素電池１５ｂが２個配置される。図１の構成の場合、素電池１５だけの積み高さ及び幅（図１（ｂ）の水平方向の長さ）はそれぞれ約６５ｍｍ及び７２（１８×４）ｍｍとなるのに対し、図８の構成の場合、それぞれ８９（４３+２３×２）ｍｍ及び９２（２３×４）ｍｍで、図１の電池パック１３が小形化可能であることが明らかである。電池パック１３の高さを低くできるので、工具１の小形化も可能となって、狭い場所での作業性向上が図れる。又工具１の重心から電池パック１３底面までの距離を短くでき、ハンドル部１０を把持した時の慣性モーメントが小さくなって、工具１がぶれにくくなるので更なる作業性向上が可能となる。更に図１の構成によれば、非挿入部の上方に空間１８が形成されるので、素電池１５ａ、１５ｂの放熱効果が高まり素電池１５ａ、１５ｂの温度上昇が抑制されるようになる。図２はかかる電池パック１３を挿入した工具１の一例を示す。 FIG. 1 shows the 14.4V battery pack 13, and the insertion portion constituted by a part of the upper case 14 a and a part of the lower case 14 b inserted into the handle part 10 has a longitudinal direction with the handle part 10. Two unit cells 15a oriented in the same direction are arranged, and a unit cell 15b whose longitudinal direction is substantially perpendicular to the handle unit 10 is formed in the non-insertion portion constituted by the upper cases 14a, 14c and the lower case 14b. Two are arranged. In the case of the configuration of FIG. 1, the stacking height and width (the horizontal length of FIG. 1B) of the unit cells 15 are about 65 mm and 72 (18 × 4) mm, respectively, whereas FIG. 1 is 89 (43 + 23 × 2) mm and 92 (23 × 4) mm, respectively, and it is apparent that the battery pack 13 of FIG. 1 can be miniaturized. Since the height of the battery pack 13 can be reduced, the tool 1 can be reduced in size, and workability can be improved in a narrow place. Further, the distance from the center of gravity of the tool 1 to the bottom surface of the battery pack 13 can be shortened, the moment of inertia when the handle portion 10 is gripped is reduced, and the tool 1 is less likely to be shaken. Further, according to the configuration of FIG. 1, since the space 18 is formed above the non-insertion portion, the heat dissipation effect of the unit cells 15a and 15b is increased, and the temperature rise of the unit cells 15a and 15b is suppressed. FIG. 2 shows an example of the tool 1 in which the battery pack 13 is inserted.

図４は電池パック１３の他の実施形態を示し、非挿入部に配置される素電池１５ｂの一部を挿入部に配置された素電池１５ａの一部と直角の角度でラップさせたものである。図５は図４の電池パック１３の一部を変えたもので、ラップ角度を鋭角としたものである。 FIG. 4 shows another embodiment of the battery pack 13 in which a part of the unit cell 15b arranged in the non-insertion part is wrapped at a right angle with a part of the unit cell 15a arranged in the insertion part. is there. FIG. 5 shows a part of the battery pack 13 shown in FIG. 4 changed, with the wrap angle being an acute angle.

図７はラップ角度を鈍角とすると共に下ケース１４ｂの底面を、ハンドル部に挿入した際に先端側が上方に位置するように傾斜させたものである。図７の電池パック１３によれば、電池パック１３の底面を床面に載置した際に胴体部９が水平面と平行になり、安定した状態で載置できると共に使い勝手もよくなる。 In FIG. 7, the wrap angle is an obtuse angle, and the bottom surface of the lower case 14b is inclined so that the tip side is positioned upward when inserted into the handle portion. According to the battery pack 13 of FIG. 7, when the bottom surface of the battery pack 13 is placed on the floor surface, the body portion 9 is parallel to the horizontal plane, and can be placed in a stable state and the usability is also improved.

本発明電池パックの一実施形態を示し、（a）は平面図、（b）は縦断側面図。1 shows an embodiment of the battery pack of the present invention, (a) is a plan view, and (b) is a longitudinal side view. 図１の電池パックをインパクトドライバに取り付けたときの内部構造を示す断面図。Sectional drawing which shows an internal structure when the battery pack of FIG. 1 is attached to an impact driver. リチウムイオン電池とニッケル水素電池との大きさの比較を示す説明用斜視図。The perspective view for description which shows the comparison of the magnitude | size of a lithium ion battery and a nickel metal hydride battery. 本発明電池パックの他の実施形態を示し、（a）は平面図、（b）は縦断側面図。The other embodiment of this invention battery pack is shown, (a) is a top view, (b) is a vertical side view. 本発明による蓄電池の縦断側面図である。It is a vertical side view of the storage battery by this invention. 本発明電池パックの更に他の実施形態を示す縦断側面図。The vertical side view which shows other embodiment of this invention battery pack. 図６の電池パックをインパクトドライバに取り付けた状態を示す側面図。The side view which shows the state which attached the battery pack of FIG. 6 to the impact driver. 従来の電池パックの一例を示し、（a）は平面図、（b）は縦断側面図。An example of the conventional battery pack is shown, (a) is a top view, (b) is a longitudinal side view. 図８の電池パックをインパクトドライバに取り付けた時の内部構造を示す全体構造図。FIG. 9 is an overall structural diagram showing an internal structure when the battery pack of FIG. 8 is attached to an impact driver.

Explanation of symbols

１はインパクトドライバ、２はハウジング、３はハンマケース、４はアンビル、５はモータ、６は遊星ギヤ部、７はスピンドル、８はハンマ、９は胴体部、１０はハンドル部、１１は風窓、１２はスイッチ、１３は電池パック、１４、１４ａ、１４ｂ、１４cは電池ケース、１５、１５ａ、１５ｂはリチウムイオン電池（素電池）、１６はラッチ、１７は端子、１８は熱を吸収する空間、１９はニッケル水素電池（素電池）。
1 is an impact driver, 2 is a housing, 3 is a hammer case, 4 is an anvil, 5 is a motor, 6 is a planetary gear part, 7 is a spindle, 8 is a hammer, 9 is a body part, 10 is a handle part, 11 is a wind window, 12 is a switch, 13 is a battery pack, 14, 14a, 14b and 14c are battery cases, 15, 15a and 15b are lithium ion batteries (unit cells), 16 is a latch, 17 is a terminal, 18 is a space for absorbing heat, 19 is a nickel metal hydride battery (unit cell).

Claims

A plurality of cells connected in series are accommodated in a battery case, the battery case is inserted into the handle part of the cordless tool, and the insertion part is located on the side of the insertion part and not inserted into the handle part. A battery pack configured to supply power to a cordless tool,
Arranged so that the longitudinal direction of the unit cell accommodated in the insertion portion is oriented in the same direction as the handle portion, and the longitudinal direction of the unit cell accommodated in the non-insertion portion is oriented substantially perpendicular to the handle portion A battery pack for a cordless tool characterized by that.