JP2008146854A - Battery pack - Google Patents

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JP2008146854A
JP2008146854A JP2006329300A JP2006329300A JP2008146854A JP 2008146854 A JP2008146854 A JP 2008146854A JP 2006329300 A JP2006329300 A JP 2006329300A JP 2006329300 A JP2006329300 A JP 2006329300A JP 2008146854 A JP2008146854 A JP 2008146854A
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tongue piece
lead plate
lead
battery pack
lead wire
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JP5064775B2 (en
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Takayuki Sakurai
貴之 櫻井
Minoru Imaizumi
実 今泉
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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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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  • Connection Of Batteries Or Terminals (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack capable of suppressing internal resistance while keeping the size small. <P>SOLUTION: The battery pack has a lead plate 20 connecting the terminals of a pair of cylindrical batteries 3A, 3B adjoined on their sides, the lead plate 20 has a tongue piece 21, the tongue piece 21 is bent to enter a trough part formed by the side parts of the cylindrical batteries 3A, 3B, the side edge part of the tongue piece 21 is bent to form a standing up part 21b, a portion 21a between the standing up parts is tapered, a bent state is constituted so that the more the tip part of the portion 21a between the standing up parts 21b, the deeper enter the dip, and a lead wire 6A is connected to the tongue piece 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、複数の電池を備えるパック電池、特にリード板におけるリード線との接続部に関する。   The present invention relates to a battery pack including a plurality of batteries, and more particularly to a connecting portion of a lead plate with a lead wire.

ノートパソコン等の電子機器の電源となるパック電池では、複数の円筒型電池がケース内に収納され、隣接する円筒型電池の正極又は負極とリード線とがリード板を介して接続される。これによって、円筒型電池と外部の電子機器に対する電力流通が行われる。
リード板は隣り合う円筒型電池の端子同士を接続する短冊状の主部と、主部の縁部から延出してリード線が接続される舌片とを有する。パック電池では小型化を図るために、リード板の主部は円筒型電池端面に沿って配され、舌片は、側面部が隣接する円筒型電池同士の外周面の間に形成される谷間部分に向いて折り曲げられる（特許文献１）。例えば、図４の要部斜視図で示すリード板９０では、主部９１が円筒型電池端面に沿って配され、主部９１の縁部から延出した舌片９２のうち谷間部分内に折り曲げられた部分（折曲部）９２ｂでリード線が接続される。このように接続されることで舌片９２とリード線が谷間部分から突出することなく配されるので、ケース内の収納スペースが大きくなることもなく、パック電池の小型化を図ることができる。 In a battery pack serving as a power source for an electronic device such as a notebook computer, a plurality of cylindrical batteries are housed in a case, and a positive electrode or a negative electrode of adjacent cylindrical batteries and a lead wire are connected via a lead plate. As a result, power is distributed to the cylindrical battery and the external electronic device.
The lead plate has a strip-shaped main portion that connects terminals of adjacent cylindrical batteries, and a tongue that extends from the edge of the main portion and is connected to a lead wire. In the battery pack, in order to reduce the size, the main part of the lead plate is arranged along the end face of the cylindrical battery, and the tongue is a valley portion formed between the outer peripheral surfaces of the cylindrical batteries whose side parts are adjacent to each other. (Patent document 1). For example, in the lead plate 90 shown in the perspective view of the main part in FIG. 4, the main part 91 is arranged along the end face of the cylindrical battery, and is bent into the valley portion of the tongue piece 92 extending from the edge of the main part 91. The lead wire is connected at the portion (bent portion) 92b. By connecting in this way, the tongue piece 92 and the lead wire are arranged without protruding from the valley portion, so that the storage space in the case does not increase and the battery pack can be downsized.

こうしたパック電池には、小型化とともに電子機器への電力供給の性能を向上させるために、リード板の電気抵抗を低減して放電電流量を増大させること等が要求されている。
特開２００３−３２３８７０号公報 Such pack batteries are required to reduce the electrical resistance of the lead plate and increase the amount of discharge current in order to reduce the size and improve the power supply performance to the electronic device.
JP 2003-323870 A

そこで、本発明者らは、例えば図４に示すリード板９０の舌片９２において折曲部９２ｂの幅Ｗを広くしてリード線との接触面積を拡大させることを検討している。しかしながら、上記舌片９２の折曲部９２ｂが配されている谷間部分は底の方が幅狭なので、折曲部９２ｂの幅Ｗを拡大するとその配設位置を谷底側に近づけることができず、リード線が浮き上がって谷間部分からはみ出してしまう。そのため、ケース内の収納領域が大きくなってしまいパック電池の小型化に反してしまう。従って、パック電池の小型化を図りつつ、リード板９０の折曲部９２ｂの幅を広くするにも限界がある。   In view of this, the present inventors are considering increasing the contact area with the lead wire by increasing the width W of the bent portion 92b in the tongue piece 92 of the lead plate 90 shown in FIG. 4, for example. However, since the bottom of the valley portion where the bent portion 92b of the tongue piece 92 is disposed is narrower, if the width W of the bent portion 92b is increased, the arrangement position cannot be brought closer to the valley bottom side. , The lead wire floats and protrudes from the valley. Therefore, the storage area in the case becomes large, which is against the downsizing of the battery pack. Therefore, there is a limit to increasing the width of the bent portion 92b of the lead plate 90 while reducing the size of the battery pack.

本発明は以上の課題に鑑みてなされており、小型化を図りつつ、内部抵抗を抑制できるパック電池を提供することを目的とする。   This invention is made | formed in view of the above subject, and it aims at providing the pack battery which can suppress internal resistance, achieving size reduction.

側面部が隣接する一対の円筒型電池の端子同士を接続するリード板が配され、このリード板は舌片を有し、この舌片は前記一対の円筒型電池の側面部によって形成されている谷間部分に入るように折曲され、前記舌片の側縁部を曲げて立ち上げ部が形成され、当該立ち上げ部の間の部位は先細り形状を有するとともに、前記折曲の状態を、前記立ち上げ部の間の部位の先端部ほど前記谷間部分に深く入るように構成され、前記舌片にリード線が接続されているパック電池の構成とする。   A lead plate for connecting terminals of a pair of cylindrical batteries whose side portions are adjacent to each other is disposed, the lead plate has a tongue piece, and the tongue piece is formed by the side portions of the pair of cylindrical batteries. It is bent so as to enter the valley portion, a side edge portion of the tongue piece is bent to form a rising portion, a portion between the rising portions has a tapered shape, and the bent state is It is set as the structure of the battery pack which is comprised so that the front-end | tip part of the site | part between rising parts may go deeply into the said valley part, and the lead wire is connected to the said tongue piece.

なお、前記円筒型電池はリチウムイオン電池とする場合、前記リード線を、前記リチウムイオン電池と外部機器との間の電力流通に用いる構成とすることができる。   When the cylindrical battery is a lithium ion battery, the lead wire can be used for power distribution between the lithium ion battery and an external device.

本発明によれば、リード板の舌片のうち立ち上げ部の間の部位は先細り形状になっているので、舌片の折曲部分の幅を大きく設定して、舌片の先端部を谷間部分に深く入れることができる。従って、リード板の電気抵抗を抑制することと、舌片における折曲された部分及びこの折曲部に接続されたリード線を谷間部分内に収めることとを両立できる。また、リード板の舌片の先端部を従来よりも谷間深く入れることができる場合、接続されるリード線の接続位置も谷間深くに設定できるので、谷間部分内でのリード線の配設スペースも広がる。よって、リード線を太くして、リード線内の電気抵抗を抑制することもできる。以上より、パック電池を大型化することなく内部抵抗を小さくした高効率のパック電池を得ることができる。   According to the present invention, the portion between the raised portions of the tongue piece of the lead plate is tapered, so the width of the bent portion of the tongue piece is set large, and the tip of the tongue piece is Can be inserted deep into the part. Therefore, the electrical resistance of the lead plate can be suppressed and the bent portion of the tongue piece and the lead wire connected to the bent portion can be accommodated in the valley portion. Also, if the tip of the lead plate tongue can be deeper than the conventional valley, the connection position of the lead wire to be connected can also be set deeper, so that the space for arranging the lead wire in the valley is also large. spread. Therefore, the lead wire can be thickened to suppress the electric resistance in the lead wire. As described above, a highly efficient battery pack with reduced internal resistance can be obtained without increasing the battery pack size.

また、舌片には立ち上げられた側縁部が備えられているので、半田等を用いたリード線の接合工程における作業性の向上を図ることもできる。   In addition, since the raised side edge portion is provided on the tongue piece, it is possible to improve the workability in the lead wire joining process using solder or the like.

以下、本発明に係るパック電池の一例について、図を用いて説明する。
＜パック電池の全体構成＞
図１（ａ）は、パック電池１００の展開斜視図である。図１（ａ）に示すように、パック電池１００は、樹脂製の上ケース１及び下ケース２による外装が構成されており、内方には、１２本の円筒型電池（以下、「素電池」と記す。）３Ａ〜３Ｌと保護回路基板４等が収納されている。 Hereinafter, an example of a battery pack according to the present invention will be described with reference to the drawings.
<Overall configuration of battery pack>
FIG. 1A is a developed perspective view of the battery pack 100. As shown in FIG. 1A, the battery pack 100 has an outer case made up of a resin upper case 1 and a lower case 2, and has 12 cylindrical batteries (hereinafter referred to as “unit cells”) inside. 3A to 3L, the protection circuit board 4 and the like are accommodated.

保護回路基板４には外部接続用端子９が接続されており、この外部接続用端子９は下ケース２の切欠部から端子部分が外部に露出している。
図１（ｂ）は図１（ａ）の要部平面図であり、この図を用いて素電池３Ａ〜３Ｌの接続形態について述べる。図１（ｂ）のように、素電池３Ａ〜３Ｌは、３本の素電池を並列接続したものを１組として４組の素電池群Ｇ１〜Ｇ４に分けられているが、これらの４組の素電池群Ｇ１〜Ｇ４はこの順に直列に接続された形態となっている。 An external connection terminal 9 is connected to the protection circuit board 4, and the terminal portion of the external connection terminal 9 is exposed to the outside from the notch portion of the lower case 2.
FIG.1 (b) is a principal part top view of Fig.1 (a), and the connection form of unit cell 3A-3L is described using this figure. As shown in FIG. 1 (b), the unit cells 3A to 3L are divided into four unit cell groups G1 to G4 with one unit obtained by connecting three unit cells in parallel. The unit cell groups G1 to G4 are connected in series in this order.

具体的には、素電池群Ｇ１は、素電池３Ａ〜３Ｃの正極同士がリード板２０によって電気的に接続され、負極同士がリード板２０Ａによって接続されている。なお、リード板２０Ａは延長されていて隣りの素電池群Ｇ２の素電池３Ｄ〜３Ｆの正極同士の接続にも用いられている。素電池群Ｇ２の素電池３Ｄ〜３Ｆの負極同士はリード板２０Ｂによって接続されている。リード板２０Ｂも延長されて、素電池群Ｇ３の素電池３Ｇ〜３Ｉの正極同士を接続している。また、素電池群Ｇ３の素電池３Ｇ〜３Ｉの負極同士はリード板２０Ｃによって接続されている。そして、素電池群Ｇ４における素電池３Ｊ〜３Ｌの正極同士はリード板２０Ｃによって接続され、負極同士はリード板２０Ｄによって接続されている。   Specifically, in the unit cell group G1, the positive electrodes of the unit cells 3A to 3C are electrically connected by the lead plate 20, and the negative electrodes are connected by the lead plate 20A. The lead plate 20A is extended and used to connect the positive electrodes of the unit cells 3D to 3F of the adjacent unit cell group G2. The negative electrodes of the unit cells 3D to 3F of the unit cell group G2 are connected by a lead plate 20B. The lead plate 20B is also extended to connect the positive electrodes of the unit cells 3G to 3I of the unit cell group G3. The negative electrodes of the unit cells 3G to 3I of the unit cell group G3 are connected to each other by a lead plate 20C. The positive electrodes of the unit cells 3J to 3L in the unit cell group G4 are connected by a lead plate 20C, and the negative electrodes are connected by a lead plate 20D.

上記リード板２０、２０Ａ〜２０Ｄを介して直列に接続された４組の素電池群Ｇ１〜Ｇ４は、リード板２０、２０Ｄに接続された電力供給用のリード線（以下、「電力用リード線」と記す。）６Ａ、６Ｂを介して保護回路基板４に接続されて外部（電子）機器への電力供給が行われる。なお、各素電池３Ａ〜３Ｌの電圧値を検知するための複数本のリード線（以下、「検知用リード線」と記す。）も各リード板２０、２０Ａ〜２０Ｄに接続されるが、図１（ｂ）では便宜上、その代表例としてリード板２０Ｂ、２０Ａに接続される検知用リード線７Ａ、７Ｂのみを記している。   The four cell groups G1 to G4 connected in series via the lead plates 20 and 20A to 20D include power supply lead wires (hereinafter referred to as “power lead wires” connected to the lead plates 20 and 20D. It is connected to the protection circuit board 4 through 6A and 6B, and power is supplied to external (electronic) equipment. A plurality of lead wires (hereinafter referred to as “detection lead wires”) for detecting the voltage values of the respective unit cells 3A to 3L are also connected to the lead plates 20, 20A to 20D. In FIG. 1 (b), for convenience, only the detection lead wires 7A and 7B connected to the lead plates 20B and 20A are shown as representative examples.

また、素電池３Ｋ、３Ｌの間には感熱素子（ＰＴＣ素子や熱電対等）８が配され、素電池群Ｇ１〜Ｇ４ごとの素電池間（例えば、素電池３Ｃ、３Ｄ間）に例えば平板状の絶縁性スペーサ１０が配されている（図１（ａ）参照）。
＜リード板２０＞
次に、電力用リード線６Ａが接続されるリード板２０の構造について図２（ａ）を用いて説明する。 Further, a thermal element (PTC element, thermocouple, etc.) 8 is arranged between the unit cells 3K, 3L, and is flat, for example, between the unit cells (for example, between the unit cells 3C, 3D) for each unit cell group G1 to G4. The insulating spacer 10 is disposed (see FIG. 1A).
<Lead plate 20>
Next, the structure of the lead plate 20 to which the power lead 6A is connected will be described with reference to FIG.

リード板２０は、平板状の金属板が折り曲げ加工されたものであって、素電池３Ａ、３Ｂ、３Ｃの端子に接続される短冊状の主部２２と、主部２２の縁部（素電池３Ａ、３Ｂの隣接位置に相当する部分）から延出されてＬ字状に折曲された舌片２１とを有する。この舌片２１における折曲角度Ｐ１は、図２（ｃ）に示すように直角よりも深く設定されている。この角度Ｐ１の大きさは、舌片２１の形状によっても変わるが、７０〜８０度程度に設定すればよい。折曲位置から先の部分（舌片２１のうち延出端部２１ｃを除く部分）の両側縁部は立ち上げられている。この立ち上げは、図２（ａ）拡大図に示すように金属板を折り目ラインＬに沿って所定角度Ｐだけ折り曲げることによってなされる。折り目ラインＬ同士の間隙は先端側に行くほど狭くなっているので、立ち上げられた立ち上げ部２１ｂの高さｈは先端にいくほど大きくなるとともに、舌片２１において立ち上がり部２１ｂの間の部位（以下、「本体部」と記す。）２１ａは先細り形状となっている。   The lead plate 20 is formed by bending a flat metal plate, and includes a strip-shaped main portion 22 connected to the terminals of the unit cells 3A, 3B, and 3C, and an edge of the main unit 22 (unit cell). 3A and 3B, and a tongue piece 21 that is bent in an L shape. The bending angle P1 of the tongue piece 21 is set deeper than the right angle as shown in FIG. The size of the angle P1 varies depending on the shape of the tongue piece 21, but may be set to about 70 to 80 degrees. Both side edges of the portion (the portion excluding the extended end portion 21c of the tongue piece 21) are raised from the bent position. This start-up is performed by bending the metal plate along the crease line L by a predetermined angle P as shown in the enlarged view of FIG. Since the gap between the crease lines L becomes narrower toward the distal end side, the height h of the raised portion 21b raised increases toward the distal end, and the portion between the raised portions 21b in the tongue piece 21 (Hereinafter referred to as “main body part”.) 21a has a tapered shape.

このように、本体部２１ａが先細り形状に形成されているので、以下で詳細に説明するが、本体部２１ａの根元部分の幅Ｗ１を幅広に形成してリード板２０の電気抵抗を小さくし、かつ、先端部を素電池３Ａ、３Ｂ間の谷間部分に深く入れることができる。なお、両側縁部を立ち上げる角度Ｐは直角程度が望ましいが特に限定はされない。
本体部２１ａの根元部分の幅Ｗ１は、素電池３Ａ、３Ｂの直径を超えない範囲内において、リード板２０の電気抵抗の抑制を図るために大きく設定されていることが好ましく、好適例として、従来の一般的な舌片幅よりも大きく、８ｍｍ程度に設定されている。一方、先端部の幅Ｗ２は、舌片２１に接続される出力用リード線６の太さに対応し得る範囲内に設定されていることが好ましく、好適例として４ｍｍ程度に設定されている。なお、本体部２１ａの延伸長さＬ１については、リード線６を谷間部分の深い位置での接続を図ることと、リード線６との接続面積を確保するために所望の長さを有することが好ましく、好適例として１０ｍｍ程度に設定されている。 As described above, since the main body portion 21a is formed in a tapered shape, it will be described in detail below. However, the width W1 of the root portion of the main body portion 21a is formed wide to reduce the electrical resistance of the lead plate 20, And a front-end | tip part can be put deeply into the valley part between unit cell 3A, 3B. Note that the angle P for raising both side edges is preferably about a right angle, but is not particularly limited.
The width W1 of the base portion of the main body portion 21a is preferably set large in order to suppress the electric resistance of the lead plate 20 within a range not exceeding the diameter of the unit cells 3A and 3B. It is larger than the conventional general tongue piece width and is set to about 8 mm. On the other hand, the width W2 of the tip is preferably set within a range that can correspond to the thickness of the output lead wire 6 connected to the tongue piece 21, and is set to about 4 mm as a preferred example. The extension length L1 of the main body portion 21a may have a desired length for connecting the lead wire 6 at a deep position in the valley portion and securing a connection area with the lead wire 6. Preferably, it is set to about 10 mm as a suitable example.

以上のような構成のリード板２０をパック電池１００内に配設するときには、隣接する素電池３Ａ、３Ｂの外周面同士の間に形成される谷間部分に、図２（ａ）に示すようにＶ字形に折った絶縁紙３０を載せ、この絶縁紙３０の上にリード板２０の舌片２１が折り曲げられた部分を載せる。この折り曲げられた部分の先端部よりリード線６Ａを挿入し、その先端部６１Ａを図２（ｂ）のように半田１２により半田付けする。   When the lead plate 20 having the above-described configuration is disposed in the battery pack 100, as shown in FIG. 2 (a), in the valley portion formed between the outer peripheral surfaces of the adjacent unit cells 3A and 3B. The insulating paper 30 folded in a V-shape is placed, and a portion where the tongue piece 21 of the lead plate 20 is folded is placed on the insulating paper 30. The lead wire 6A is inserted from the tip of the bent portion, and the tip 61A is soldered with the solder 12 as shown in FIG.

このとき、舌片２１の本体部２１ａは上述したように先細り形状になっており、図２（ｃ）に示されるように舌片２１の本体部２１ａと主部２２とのなす角度Ｐ１が７０〜８０度に設定されているので、先端部は本体部２１ａの根元部分と比べてＶ溝深く入ることになる。立ち上げ部２１ｂは先端に行くほど高さｈが大きくなるが、舌片２１の本体部２１ａは先端に行くほどＶ溝に深く入っているので、立ち上げ部２１ｂの上端部は絶縁紙３０のＶ溝内に収められ、リード線６Ａもこの中に収められて素電池３Ａ、３Ｂの上端より突出することはない。このように、舌片２１とリード線６Ａが谷間部分内に収まるので、パック電池１００内における収納スペースが拡大されることもなく、パック電池１００全体が大きくなることもない。なお、舌片２１の先端部を従来と比較してＶ溝深く入れるような舌片２１の構成とすれば、舌片２１におけるリード線６の接続位置を深くすることができる。従って、谷間部分内において、リード線６を配設できるスペースが大きくなるので、谷間部分から突出しないようにリード線６を太くすることも可能となる。リード線６が太くなればリード線６の電気抵抗は抑制され、パック電池１００の内部抵抗がさらに小さくなるので好ましい。   At this time, the main body portion 21a of the tongue piece 21 has a tapered shape as described above, and the angle P1 formed by the main body portion 21a and the main portion 22 of the tongue piece 21 is 70 as shown in FIG. Since the angle is set to ˜80 degrees, the distal end portion is deeper than the root portion of the main body portion 21a. Although the height h of the rising portion 21b increases toward the tip, the main body portion 21a of the tongue piece 21 enters the V groove deeper toward the tip, so that the upper end portion of the rising portion 21b is formed of the insulating paper 30. The lead wire 6A is also housed in the V-groove and does not protrude from the upper ends of the unit cells 3A and 3B. Thus, since the tongue piece 21 and the lead wire 6A are accommodated in the valley portion, the storage space in the battery pack 100 is not enlarged, and the battery pack 100 as a whole is not enlarged. In addition, if it is set as the structure of the tongue piece 21 which inserts the front-end | tip part of the tongue piece 21 deeply compared with the former, the connection position of the lead wire 6 in the tongue piece 21 can be deepened. Accordingly, the space in which the lead wire 6 can be disposed increases in the valley portion, and thus the lead wire 6 can be thickened so as not to protrude from the valley portion. A thick lead wire 6 is preferable because the electrical resistance of the lead wire 6 is suppressed and the internal resistance of the battery pack 100 is further reduced.

そして、舌片２１の本体部２１ａは上記のように、図４に示す従来の舌片９２と比較してその根元部分の幅Ｗ１を大きくしているので、舌片２１の電気抵抗を従来の舌片９２と比較して小さくできる。従って、パック電池１００の内部抵抗を小さくでき、放電電流を増加させることができる等、パック電池１００の性能を向上させることができる。さらに、立ち上げ部２１ｂも電力用リード線６Ａとの半田１２で電気接続することができるので、立ち上げ部２１ｂが設けられていない形態よりも電力用リード線６Ａとの電気接続抵抗を抑制して出力電流の更なる向上につながる。また、立ち上げ部２１ｂによって半田工程の作業性も良好になり好ましい。
＜舌片２１の変形例＞
リード板に設ける舌片形状としては、上記の舌片２１の形状だけでなく、例えば図３の模式図のような舌片３１の形状としてもよい。図３に示す舌片３１では、折り曲げられた部分における立ち上げ部３１ｂが、上記舌片２１のように折り曲げられた部分の根元からではなく所定距離Ｌだけ離れた位置から設けられている点で異なる。 As described above, the main body 21a of the tongue piece 21 has a width W1 of the root portion larger than that of the conventional tongue piece 92 shown in FIG. It can be made smaller than the tongue piece 92. Therefore, the performance of the battery pack 100 can be improved, for example, the internal resistance of the battery pack 100 can be reduced and the discharge current can be increased. Furthermore, since the rising portion 21b can also be electrically connected to the power lead wire 6A with the solder 12, the electrical connection resistance with the power lead wire 6A is suppressed as compared with the configuration in which the rising portion 21b is not provided. This leads to further improvement of the output current. Moreover, the workability of the soldering process is also improved by the rising portion 21b, which is preferable.
<Modified example of tongue piece 21>
The shape of the tongue piece provided on the lead plate is not limited to the shape of the tongue piece 21 described above, but may be the shape of the tongue piece 31 as shown in the schematic diagram of FIG. In the tongue piece 31 shown in FIG. 3, the rising part 31b in the bent part is provided not from the root of the bent part like the tongue piece 21 but from a position separated by a predetermined distance L. Different.

この所定距離Ｌだけ延伸しているつけ根部分３１ｃは素電池３Ａ〜３Ｃの円筒軸方向と略並行となるように主部２２に対して折り曲げられることで谷間部分内に配される。さらにその先端側では立ち上げ部３１ｂの間の部位（本体部）３１ａの幅が漸減する形状（先細り形状）なので、上記舌片２１と同様に先端部を谷底側に位置するように傾斜させることができる。
＜検知用のリード板＞
ところで、パック電池１００内には電力用リード線６Ａ、６Ｂの他にも、素電池３Ａ〜３Ｌごとの電圧を検知する検知用リード線７Ａ、７Ｂも配されており、検知用リード線７Ａも、上記のリード板２０と同様に主部の縁部から延出した舌片が谷間部分内に入り込むように折り曲げられた形状のリード板（以下、「検知用リード板」と記す。）を介して素電池３Ａ〜３Ｌの正極及び負極に接続されている。ただし、検知用リード板の舌片の形状は、電力用リード線６Ａが接続されるリード板２０とは異なり、側縁部は立ち上げられておらず、従来形態と同様の矩形状（図４参照）である。検知用リード板の舌片は、上記リード板２０の舌片２１より表面積は小さいが、検知用リード線７Ａ、７Ｂでは電力用リード線６Ａのように高効率な電力供給を図るのではなく各素電池３Ａ〜３Ｌの電圧値検出を目的としているので、上記矩形状の舌片で十分対応できる。また、検知用リード板の舌片の形状であればその折り曲げ部分を谷間部分に収めることもでき、検知用リード線７Ａも谷間部分に収めることができるので、パック電池の小型化を図ることができる。なお、検知用リード板も谷底側に傾斜するが、上記リード板２０よりも舌片に係る折り曲げ部分の根元部分の幅が小さいのでこの根元部分を上記リード板２０の根元部分よりも谷間部分の深い位置に配することができる。即ち、検知用リード板の折曲部は主部に対する傾斜角度が上記リード板２０と同程度の傾斜角度Ｐ１でなくてもその折曲部を谷間部分内に収めることができ、パック電池の大型化を招くこともない。
＜その他の事項＞
なお、舌片２１、３１の折り曲げに関しては、主部２２から所定距離だけ延出した位置で折り曲げたＬ字状としなくても、延出端部２１ｃ、３１ｄを設けずに、主部２２からの延出位置で折り曲げられた形状としてもよい。また、舌片２１、３１の立ち上げ部２１ｂ、３１ｂについては図２、３に示すような立ち上げ部２１ｂ、３１ｂが用いられているが、例えば出力用リード線６との接続位置に相当する部分までは高さが高くなり、その位置より先端側では高さが低くなるような形状の舌片２１、３１でも構わない。 The root portion 31c extending by the predetermined distance L is disposed in the valley portion by being bent with respect to the main portion 22 so as to be substantially parallel to the cylindrical axis direction of the unit cells 3A to 3C. Furthermore, since the width of the portion (main body portion) 31a between the rising portions 31b is gradually reduced (tapered shape) on the distal end side, the distal end portion is inclined so as to be located on the valley bottom side in the same manner as the tongue piece 21. Can do.
<Lead plate for detection>
Incidentally, in the battery pack 100, in addition to the power lead wires 6A and 6B, detection lead wires 7A and 7B for detecting the voltages of the unit cells 3A to 3L are also arranged, and the detection lead wire 7A is also provided. Similarly to the lead plate 20 described above, a lead plate (hereinafter referred to as “detection lead plate”) having a shape bent so that the tongue piece extending from the edge of the main portion enters the valley portion is used. Are connected to the positive and negative electrodes of the unit cells 3A to 3L. However, the shape of the tongue of the lead plate for detection is different from the lead plate 20 to which the power lead wire 6A is connected, the side edge is not raised, and the same rectangular shape as in the conventional embodiment (FIG. 4). Reference). The tongue piece of the detection lead plate has a smaller surface area than the tongue piece 21 of the lead plate 20, but the detection lead wires 7A and 7B are not intended to supply power with high efficiency like the power lead wire 6A. Since the purpose is to detect the voltage values of the unit cells 3A to 3L, the rectangular tongue piece can be used sufficiently. Further, if the tongue of the detection lead plate is in the shape, the bent portion can be accommodated in the valley, and the detection lead wire 7A can also be accommodated in the valley, so that the battery pack can be miniaturized. it can. Although the lead plate for detection is also inclined toward the bottom of the valley, the width of the root portion of the bent portion related to the tongue piece is smaller than that of the lead plate 20, so that this root portion is located in the valley portion than the root portion of the lead plate 20. Can be placed deep. That is, even if the bent portion of the lead plate for detection is not inclined at the same angle as the lead plate 20 with respect to the main portion, the bent portion can be accommodated in the valley portion. There is no inconvenience.
<Other matters>
Note that the tongue pieces 21 and 31 can be bent from the main portion 22 without providing the extended end portions 21c and 31d, even if the tongue pieces 21 and 31 are not L-shaped at a position extending from the main portion 22 by a predetermined distance. It is good also as a shape bent in the extended position. Further, as for the rising portions 21b and 31b of the tongue pieces 21 and 31, the rising portions 21b and 31b as shown in FIGS. 2 and 3 are used, which corresponds to, for example, a connection position with the output lead wire 6. The tongue pieces 21 and 31 may be shaped so that the height is high up to the portion and the height is lower on the tip side than the position.

その他、検知用リード板は電力用リード線６Ａが接続されるリード板２０と異なる形状としているが、パック電池の製造コスト等に支障が無ければ、同じ構成でもよい。また、リード線６Ａとリード板２０との接続には半田が用いられているが、半田を用いないでカシメ加工で接続固定する構成でもよい。さらに、各素電池３Ａ〜３Ｌとしては、リチウムイオン電池に限らず、ニッケルカドミウム電池等の他の電池も適用できる。   In addition, the detection lead plate has a different shape from the lead plate 20 to which the power lead wire 6A is connected. However, the same configuration may be used as long as the manufacturing cost of the battery pack is not affected. Further, although solder is used for connection between the lead wire 6A and the lead plate 20, a configuration in which the connection is fixed by caulking without using solder may be used. Furthermore, as each unit cell 3A-3L, not only a lithium ion battery but other batteries, such as a nickel cadmium battery, are also applicable.

本発明は、様々な大きさの円筒型電池を備えたパック電池に利用できる。   INDUSTRIAL APPLICABILITY The present invention can be used for battery packs having cylindrical batteries of various sizes.

（ａ）は本発明の実施形態に係るパック電池の展開斜視図であり、（ｂ）は同実施形態に係る素電池の接続形態を示す模式図である。(A) is a development perspective view of a pack battery concerning an embodiment of the present invention, and (b) is a mimetic diagram showing a connection form of a unit cell concerning the embodiment. （ａ）は同実施形態に係るリード板を素電池の関係を示す要部斜視図であり、（ｂ）は同実施形態に係るリード板と電力用リード線の接続状態を示す要部斜視図であり、（ｃ）は同実施形態に係るリード板とリード線の接続状態と素電池との関係を示す断面図である。(A) is a principal part perspective view which shows the relationship of a unit cell with the lead plate which concerns on the same embodiment, (b) is a principal part perspective view which shows the connection state of the lead board and electric power lead wire which concern on the same embodiment. (C) is sectional drawing which shows the relationship between the connection state of the lead board which concerns on the embodiment, and a lead wire, and a unit cell. 同実施形態の変形例に係るリード板の要部斜視図である。It is a principal part perspective view of the lead plate which concerns on the modification of the embodiment. 従来形態に係るリード板の要部斜視図である。It is a principal part perspective view of the lead plate which concerns on a prior art form.

符号の説明Explanation of symbols

１ 上ケース
２ 下ケース
３Ａ〜３Ｌ リチウムイオン電池
４ 保護回路基板
５ リード板
６Ａ、６Ｂ 電力用リード線
７Ａ、７Ｂ 検知用リード線
８ 感熱素子
９ 外部接続端子
１０ スペーサ
２０ リード板
２１ 舌片
２１ａ 本体部
２１ｂ 立ち上げ部
２１ｃ 延出端部
２２ 主部
３０ 絶縁紙
１００ パック電池 DESCRIPTION OF SYMBOLS 1 Upper case 2 Lower case 3A-3L Lithium ion battery
4 Protection circuit board 5 Lead plate 6A, 6B Power lead wire 7A, 7B Detection lead wire 8 Thermal element 9 External connection terminal 10 Spacer 20 Lead plate 21 Tongue piece 21a Main body portion 21b Rising portion 21c Extension end portion 22 Main Part 30 Insulating paper 100 Pack battery

Claims (2)

側面部が隣接する一対の円筒型電池の端子同士を接続するリード板が配され、
このリード板は舌片を有し、この舌片は前記一対の円筒型電池の側面部によって形成されている谷間部分に入るように折曲され、
前記舌片の側縁部を曲げて立ち上げ部が形成され、当該立ち上げ部の間の部位は先細り形状を有するとともに、
前記折曲の状態を、前記立ち上げ部の間の部位の先端部ほど前記谷間部分に深く入るように構成され、
前記舌片にリード線が接続されている
ことを特徴とするパック電池。 A lead plate for connecting terminals of a pair of cylindrical batteries whose side portions are adjacent to each other is arranged,
The lead plate has a tongue piece, and the tongue piece is bent so as to enter a valley portion formed by the side portions of the pair of cylindrical batteries,
A rising portion is formed by bending a side edge portion of the tongue piece, and a portion between the rising portions has a tapered shape,
The bent state is configured so that the tip part of the part between the rising parts enters the valley part deeply,
A battery pack, wherein a lead wire is connected to the tongue piece. 前記円筒型電池はリチウムイオン電池であり、
前記リード線は、前記リチウムイオン電池と外部機器との間の電力流通に用いられる
ことを特徴とする請求項１に記載のパック電池。 The cylindrical battery is a lithium ion battery,
The battery pack according to claim 1, wherein the lead wire is used for power distribution between the lithium ion battery and an external device.
JP2006329300A 2006-12-06 2006-12-06 Pack battery Expired - Fee Related JP5064775B2 (en)

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JP2010092850A (en) * 2008-10-08 2010-04-22 Samsung Sdi Co Ltd Battery pack
JP2010225449A (en) * 2009-03-24 2010-10-07 Autonetworks Technologies Ltd Connecting unit
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JP2011222459A (en) * 2010-04-14 2011-11-04 Sanyo Electric Co Ltd Battery pack
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JP2012004106A (en) * 2010-06-21 2012-01-05 Samsung Sdi Co Ltd Battery pack connector and coupling method thereof

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JP2003263976A (en) * 2002-03-11 2003-09-19 Matsushita Electric Ind Co Ltd Cell pack
JP2003317679A (en) * 2002-04-24 2003-11-07 Matsushita Electric Ind Co Ltd Battery pack
JP2005317459A (en) * 2004-04-30 2005-11-10 Sanyo Electric Co Ltd Battery pack

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JP2003263976A (en) * 2002-03-11 2003-09-19 Matsushita Electric Ind Co Ltd Cell pack
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JP2005317459A (en) * 2004-04-30 2005-11-10 Sanyo Electric Co Ltd Battery pack

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Publication number Priority date Publication date Assignee Title
JP2010092850A (en) * 2008-10-08 2010-04-22 Samsung Sdi Co Ltd Battery pack
US8945757B2 (en) 2008-10-08 2015-02-03 Samsung Sdi Co., Ltd. Battery pack having conductive line holders
JP2010225449A (en) * 2009-03-24 2010-10-07 Autonetworks Technologies Ltd Connecting unit
JP2011096621A (en) * 2009-10-27 2011-05-12 Samsung Sdi Co Ltd Battery pack
US9005798B2 (en) 2009-10-27 2015-04-14 Samsung Sdi Co., Ltd. Battery pack
JP2011222391A (en) * 2010-04-13 2011-11-04 Makita Corp Battery pack
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