JP2006172870A - Battery and battery pack - Google Patents

Battery and battery pack Download PDF

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JP2006172870A
JP2006172870A JP2004362925A JP2004362925A JP2006172870A JP 2006172870 A JP2006172870 A JP 2006172870A JP 2004362925 A JP2004362925 A JP 2004362925A JP 2004362925 A JP2004362925 A JP 2004362925A JP 2006172870 A JP2006172870 A JP 2006172870A
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heat transfer
transfer end
battery
end portion
peripheral edge
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Yoshiaki Ebine
美明 恵比根
Tomoyasu Takeuchi
友康 竹内
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Toyota Motor Corp
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Toyota Motor Corp
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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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Abstract

<P>PROBLEM TO BE SOLVED: To realize a technology capable of efficiently cooling an electrode body by cooling an adherence peripheral edge forming a case and not rewiring to increase heat-conducting characteristic of an insulating sheet, wherein insulation of a positive terminal and a negative terminal is not impaired since the electrode body is cooled by cooling the insulated outer surface of the case. <P>SOLUTION: The positive terminal 6 connected with a positive electrode of the electrode body 10 is provided with a projection end part 62 projected outside beyond a peripheral edge part 42 of an exterior case 4 and a heat transfer end part 66 staying in the peripheral edge part 42 and not projected outside. A negative terminal 8 connected with a negative electrode of the electrode body 10 is provided with a projection end part 82 projected outside beyond the peripheral edge part 42 of the exterior case and a heat transfer end part 86 staying in the peripheral edge part 42 and not projected outside. The heat transfer end part 62 and the heat transfer end part 82 are covered with the peripheral edge part 42 of a surface side exterior case 4 and a back surface side exterior case 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、電池と組電池に関する。なお本明細書でいう電池という用語は広義に解釈するべきであり、化学反応を利用して電力を供給する狭義の電池のみならず、キャパシタやコンデンサ等のように蓄電しておいた電力を供給するデバイスをも包含する。   The present invention relates to a battery and an assembled battery. In addition, the term battery in this specification should be interpreted in a broad sense, supplying not only a narrowly-defined battery that supplies power using a chemical reaction, but also the stored power such as a capacitor or a capacitor. It also includes devices that do.

正極と負極を含む電極体を有する電池が知られている。コンパクトな電池を安価に製造するために、表面側絶縁シートと裏面側絶縁シートの間に電極体を挟み、表面側絶縁シートと裏面側絶縁シートの周縁を密着することに電池ケースを形成する技術が開発されている。電極体の正極に接続されている正端子の端部と負極に接続されている負端子の端部はケースの外部に突出している。   A battery having an electrode body including a positive electrode and a negative electrode is known. In order to manufacture a compact battery at low cost, a battery case is formed by sandwiching an electrode body between a front-side insulating sheet and a back-side insulating sheet and closely adhering the periphery of the front-side insulating sheet and the back-side insulating sheet. Has been developed. The end of the positive terminal connected to the positive electrode of the electrode body and the end of the negative terminal connected to the negative electrode protrude from the case.

電池は充電と放電の際に発熱する。そこで、電池を効率的に冷却する必要がある。特許文献1には、正面視したときに長方形をなす電池ケースの１辺から正端子を突出させ、他の３辺から３方向に負端子を突出させた電池が提案されている。この電池は、正端子と負端子を電気伝導体に利用するだけでなく、伝熱部材として利用する。電池が発熱すると、電池ケースから４方向に突出する端子に熱が伝熱されるために、電池の冷却効率が向上する。
特許文献２には、表面側絶縁シートと裏面側絶縁シートの密着周縁を活用することによって、電池の冷却効率を向上させる技術も提案されている。
特開２００４−４７２３９号公報 特開２００４−７１１７９号公報 Batteries generate heat during charging and discharging. Therefore, it is necessary to cool the battery efficiently. Patent Document 1 proposes a battery in which a positive terminal protrudes from one side of a rectangular battery case when viewed from the front and a negative terminal protrudes in three directions from the other three sides. In this battery, not only the positive terminal and the negative terminal are used as an electric conductor but also as a heat transfer member. When the battery generates heat, heat is transferred from the battery case to the terminals protruding in four directions, so that the cooling efficiency of the battery is improved.
Patent Document 2 also proposes a technique for improving the cooling efficiency of the battery by utilizing the contact edge between the front surface side insulating sheet and the back surface side insulating sheet.
JP 2004-47239 A JP 2004-71179 A

電気を取出すための正端子と負端子を伝熱部材としても利用し、正端子と負端子を冷却風に曝す構造を採用すると、正端子と負端子上に埃や塵等が堆積し、絶縁が損なわれる可能性がある。それを避けるために、正端子と負端子に絶縁被覆や絶縁構造を付加すると、冷却効率が低下してしまう。電気伝導体を放熱部材に利用することは難しい。
表面側絶縁シートと裏面側絶縁シートの密着周縁の表面は絶縁されており、密着周縁を冷却風等に曝しても、絶縁が損なわれことはない。しかしながら、ケースを形成する絶縁シートは極めて薄く、伝熱性が低い。密着周縁を冷却しても、電極体は冷却されないことになる。絶縁シートを厚くして伝熱性を上げれば、密着周縁を冷却することによって電極体が冷却されることになるが、そのためには絶縁シートを非常に厚くする必要があり、現実的でない。 Using a structure in which the positive and negative terminals for taking out electricity are also used as heat transfer members and the positive and negative terminals are exposed to cooling air, dust and dirt accumulate on the positive and negative terminals, insulating them. May be damaged. In order to avoid this, if an insulating coating or an insulating structure is added to the positive terminal and the negative terminal, the cooling efficiency is lowered. It is difficult to use an electric conductor as a heat dissipation member.
The surface of the adhesion peripheral edge of the surface side insulating sheet and the back surface insulating sheet is insulated, and even if the adhesion peripheral edge is exposed to cooling air or the like, the insulation is not impaired. However, the insulating sheet forming the case is extremely thin and has low heat conductivity. Even if the contact edge is cooled, the electrode body is not cooled. If the insulating sheet is thickened to increase the heat transfer property, the electrode body is cooled by cooling the adhesion peripheral edge. However, for this purpose, it is necessary to make the insulating sheet very thick, which is not practical.

本発明は、上記の問題を解決するものであり、ケースを形成する密着周縁を冷却することによって電極体を効率的に冷却することができ、しかも、絶縁シートの伝熱性を上げる必要がない技術を実現する。絶縁されているケース外面を冷却することによって電極体を冷却するために、正端子と負端子の絶縁が損なわれることもない。   The present invention solves the above-described problem, and can cool the electrode body efficiently by cooling the contact peripheral edge forming the case, and does not need to increase the heat conductivity of the insulating sheet. Is realized. Since the electrode body is cooled by cooling the outer surface of the insulated case, the insulation between the positive terminal and the negative terminal is not impaired.

（課題を解決するための一つの手段）
本発明の電池は、正極と負極を含む電極体と、電極体の正極に接続されている正端子と、電極体の負極に接続されている負端子と、正端子の端部と負端子の端部が外部に突出している状態で電極体を収容しているケースを備えている。
本発明の電池では、表面側絶縁シートと裏面側絶縁シートが周縁で密着することによってケースが形成されている。正端子は、絶縁シートの密着周縁を越えて伸びることによって外部に突出する突出端部の他に、密着周縁内に留まって外部に突出しない伝熱端部を備えている。同様に、負端子も、絶縁シートの密着周縁を越えて伸びることによって外部に突出する突出端部の他に、密着周縁内に留まって外部に突出しない伝熱端部を備えている。この結果、正端子の伝熱端部と負端子の伝熱端部は、表面側絶縁シートと裏面側絶縁シートの密着周縁によって被覆されている。 (One way to solve the problem)
The battery of the present invention includes an electrode body including a positive electrode and a negative electrode, a positive terminal connected to the positive electrode of the electrode body, a negative terminal connected to the negative electrode of the electrode body, an end of the positive terminal, and a negative terminal A case is provided in which the electrode body is accommodated with the end portion protruding to the outside.
In the battery of the present invention, the case is formed by the close contact between the front surface side insulating sheet and the back surface side insulating sheet at the periphery. The positive terminal includes a heat transfer end portion that stays within the contact edge and does not protrude outside, in addition to the protruded end portion that protrudes outside by extending beyond the contact edge of the insulating sheet. Similarly, the negative terminal also includes a heat transfer end portion that stays within the contact edge and does not protrude outside, in addition to the protruded end portion that protrudes outside by extending beyond the contact edge of the insulating sheet. As a result, the heat transfer end portion of the positive terminal and the heat transfer end portion of the negative terminal are covered with the adhesion peripheral edge of the front surface side insulating sheet and the back surface side insulating sheet.

（その作用と効果）
本発明の電池の正端子は、絶縁シートの密着周縁密着周縁内に留まって外部に突出しない伝熱端部を備えている。同様に、負端子も、絶縁シートの密着周縁密着周縁内に留まって外部に突出しない伝熱端部を備えている。
正端子も負端子も、十分な電気伝導性を有する必要あり、結果的に十分な伝熱性を備えている。本発明では、この性質を利用して電極体の熱をケースの密着周縁に効率的に伝熱する。本発明の電池によると、ケースの密着周縁を冷却することによって電極体を効率的に冷却することができる。絶縁シートの伝熱性を上げる必要はない。伝熱端部は、表面側絶縁シートと裏面側絶縁シートの密着周縁によって被覆されており、絶縁が損なわれる可能性が低い。ケースの密着周縁を冷却風等に曝しても、絶縁が損なわれことはない。
本電池では、電気を取出すためにケース外に突出している正端子と負端子を冷却する必要がなく、絶縁が損なわれることはない。十分な電気伝導性と十分な伝熱性を備えている正端子と負端子を利用して、電極体の熱をケースの密着周縁に効率的に伝熱するために、絶縁シートの伝熱性を上げる必要はない。絶縁シートの表面を冷却すればよいことから、絶縁シートの表面に埃や塵等が堆積しても、絶縁が損なわれることがない。 (The action and effect)
The positive terminal of the battery of the present invention includes a heat transfer end portion that stays within the tight contact edge of the insulating sheet and does not protrude to the outside. Similarly, the negative terminal also has a heat transfer end portion that stays within the tight contact edge of the insulating sheet and does not protrude to the outside.
Both the positive terminal and the negative terminal need to have sufficient electrical conductivity, and as a result, have sufficient heat conductivity. In this invention, the heat | fever of an electrode body is efficiently transferred to the contact | adherence periphery of a case using this property. According to the battery of the present invention, the electrode body can be efficiently cooled by cooling the close contact periphery of the case. There is no need to increase the heat conductivity of the insulating sheet. The heat transfer end portion is covered with the adhesion peripheral edge of the front surface side insulating sheet and the back surface side insulating sheet, and the possibility that the insulation is damaged is low. Even if the close contact edge of the case is exposed to cooling air or the like, the insulation is not impaired.
In the present battery, it is not necessary to cool the positive terminal and the negative terminal protruding outside the case in order to take out electricity, and the insulation is not impaired. Utilizing positive and negative terminals with sufficient electrical conductivity and sufficient heat conductivity, the heat transfer of the insulating sheet is increased in order to efficiently transfer the heat of the electrode body to the close contact edge of the case. There is no need. Since the surface of the insulating sheet only needs to be cooled, even if dust or dust accumulates on the surface of the insulating sheet, the insulation is not impaired.

（課題を解決するための好ましい手段）
正端子の伝熱端部と負端子の伝熱端部が、正端子も負端子も突出していない辺において密着周縁によって被覆されていることが好ましい。
（その作用と効果）
上記によると、伝熱端部が位置しているために効率的に冷却したい辺と、正端子または負端子若しくは双方が突出しているために外界から隔離しておきたい辺を分離することができ、冷却と絶縁確保を無理なく両立させることができる。 (Preferred means for solving the problem)
It is preferable that the heat transfer end portion of the positive terminal and the heat transfer end portion of the negative terminal are covered with a contact edge at a side where neither the positive terminal nor the negative terminal protrudes.
(The action and effect)
According to the above, it is possible to separate the side to be efficiently cooled because the heat transfer end is located and the side to be isolated from the outside because the positive terminal or the negative terminal or both protrude. Cooling and insulation can be achieved without difficulty.

（課題を解決するための好ましい他の一つの手段）
正端子の伝熱端部と負端子の伝熱端部が、同一の辺において、密着周縁によって被覆されていることが好ましい。
（その作用と効果）
正端子の伝熱端部と負端子の伝熱端部が位置している一つの辺の密着周縁を冷却媒体通路に曝せばよく、冷却のための構成を簡素化することができる。 (Another preferable means for solving the problem)
It is preferable that the heat transfer end portion of the positive terminal and the heat transfer end portion of the negative terminal are covered with the contact edge on the same side.
(The action and effect)
The contact edge of one side where the heat transfer end portion of the positive terminal and the heat transfer end portion of the negative terminal are located may be exposed to the cooling medium passage, and the configuration for cooling can be simplified.

（課題を解決するための他の一つの手段）
組電池を構成する場合には、請求項１から３のいずれか電池を電気的に複数個接続し、正端子の伝熱端部と負端子の伝熱端部を被覆している密着周縁に接する冷却媒体通路を設けることが好ましい。
冷却媒体は、空気であることが多いが、他の気体または液体であってもよい。 (Another means to solve the problem)
In the case of constituting an assembled battery, a plurality of the batteries according to any one of claims 1 to 3 are electrically connected to each other, and the contact peripheral edge covering the heat transfer end portion of the positive terminal and the heat transfer end portion of the negative terminal is provided. It is preferable to provide a cooling medium passage in contact therewith.
The cooling medium is often air, but may be other gases or liquids.

以下に発明を実施するための最良の形態を列記する。
（形態１）ケースを形成する絶縁シートは、内側から内側絶縁シートと金属シートの順に積層されている。絶縁シートと絶縁シートが直接に接触する部位では、内側絶縁シート同士が熱溶着している。絶縁シートと絶縁シートの間に端子が入り込んでいる部分では、内側絶縁シートが端子に熱溶着している。
(形態２)電極体は、長尺の正極と長尺の負極がセパレータを介した状態でロール状に捲回されており、正面視したときにほぼ長方形状となるように、扁平に押しつぶされている。１辺には、正極の金属シートが露出しており、それと向いあう辺には、負極の金属シートが露出している。
（形態３）伝熱端部は、金属シートが露出している辺に対応する密着周縁に向けて伸びている。
（形態４）伝熱端部は、金属シートが露出していない辺に対応する密着周縁に向けて伸びている。 The best mode for carrying out the invention is listed below.
(Mode 1) The insulating sheet forming the case is laminated in the order of the inner insulating sheet and the metal sheet from the inside. At the part where the insulating sheet and the insulating sheet are in direct contact, the inner insulating sheets are thermally welded to each other. In the portion where the terminal is inserted between the insulating sheet and the insulating sheet, the inner insulating sheet is thermally welded to the terminal.
(Embodiment 2) The electrode body is wound in a roll shape with a long positive electrode and a long negative electrode through a separator, and is flattened so as to be almost rectangular when viewed from the front. ing. The positive metal sheet is exposed on one side, and the negative metal sheet is exposed on the side facing it.
(Mode 3) The heat transfer end portion extends toward the close contact edge corresponding to the side where the metal sheet is exposed.
(Mode 4) The heat transfer end portion extends toward the close contact edge corresponding to the side where the metal sheet is not exposed.

（第１実施例）
図面を参照して、本発明を具現化した第１実施例を説明する。図１は、本実施例の電池の分解斜視図である。
電池２は、外装ケース４の中に電極体１０を密閉して収容している。
電極体１０は、長尺の金属シート状箔材の表面に正極活物質が塗工された正極と、樹脂製の多孔質膜シートであるセパレータと、長尺の金属シート状箔材の表面に負極活物質が塗工された負極と、前記と同様のセパレータの組を積層して捲回したものである。正面視したときにほぼ長方形状となるように、扁平に押しつぶされている。正極となる長尺の金属シート状箔材の１辺に沿って、正極活物質が塗工されていない正極未塗工部１２が用意されおり、負極となる長尺の金属シート状箔材の反対の１辺に沿って、負極活物質が塗工されていない負極未塗工部１４が用意されおり、それぞれの未塗工部１２、１４は、セパレータから突出している。未塗工部１２、１４では、金属シート状箔材のみが積層されている。 (First embodiment)
A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the battery of this embodiment.
The battery 2 encloses the electrode body 10 in an outer case 4 in a sealed manner.
The electrode body 10 includes a positive electrode in which a positive electrode active material is coated on the surface of a long metal sheet-shaped foil material, a separator that is a resin porous film sheet, and a surface of a long metal sheet-shaped foil material. A negative electrode coated with a negative electrode active material and a separator set similar to those described above are laminated and wound. It is crushed flat so that it is almost rectangular when viewed from the front. A positive electrode uncoated portion 12 that is not coated with a positive electrode active material is prepared along one side of a long metal sheet foil material to be a positive electrode, and a long metal sheet foil material to be a negative electrode is prepared. A negative electrode uncoated portion 14 that is not coated with a negative electrode active material is prepared along the opposite side, and each of the uncoated portions 12 and 14 protrudes from the separator. In the uncoated parts 12 and 14, only the metal sheet-like foil material is laminated.

正端子６には、突出端部６２と、接合部６４と、伝熱端部６６が形成されている。負端子８には、突出端部８２と、接合部８４と、伝熱端部８６が形成されている。
正端子６の接合部６４は電極体１０の正極未塗工部１２に溶接されている。正端子６は電極体１０の正極に、電気的にも熱的にも接続されている。負端子８の接合部８４は電極体１０の負極未塗工部１４に溶接されている。負端子８は電極体１０の負極に、電気的にも熱的にも接続されている。
正端子６の突出端部６２と負端子８の突出端部８２は、電極体１０の捲回軸と直交する方向に伸びており、外装ケース４の周縁部４２を越える長さを備えている。突出端部６２と突出端部８２は同一方向に伸びている。
正端子６の伝熱端部６６は、接合部６４から電極体１０の捲回軸方向と平行する方向に伸びており、外装ケース４の周縁部４２を越えない長さを備えている。負端子８の伝熱端部８６も、接合部６４から電極体１０の捲回軸方向と平行する方向に伸びており、外装ケース４の周縁部４２を越えない長さを備えている。伝熱端部６６と伝熱端部８６は反対方向に伸びている。伝熱端部６６と伝熱端部８６は、突出端部６２と突出端部８２が突出する辺とは異なる辺に向けて伸びている。伝熱端部６６と伝熱端部８６が伸びている辺からは、突出端部６２も突出端部８２も突出しない。 The positive terminal 6 has a protruding end 62, a joint 64, and a heat transfer end 66. The negative terminal 8 is formed with a protruding end portion 82, a joint portion 84, and a heat transfer end portion 86.
The joint portion 64 of the positive terminal 6 is welded to the positive electrode uncoated portion 12 of the electrode body 10. The positive terminal 6 is electrically and thermally connected to the positive electrode of the electrode body 10. The joint portion 84 of the negative terminal 8 is welded to the negative electrode uncoated portion 14 of the electrode body 10. The negative terminal 8 is electrically and thermally connected to the negative electrode of the electrode body 10.
The protruding end portion 62 of the positive terminal 6 and the protruding end portion 82 of the negative terminal 8 extend in a direction orthogonal to the winding axis of the electrode body 10 and have a length exceeding the peripheral edge portion 42 of the outer case 4. . The protruding end 62 and the protruding end 82 extend in the same direction.
The heat transfer end portion 66 of the positive terminal 6 extends from the joint portion 64 in a direction parallel to the winding axis direction of the electrode body 10 and has a length that does not exceed the peripheral edge portion 42 of the exterior case 4. The heat transfer end portion 86 of the negative terminal 8 also extends from the joint portion 64 in a direction parallel to the winding axis direction of the electrode body 10 and has a length that does not exceed the peripheral edge portion 42 of the exterior case 4. The heat transfer end portion 66 and the heat transfer end portion 86 extend in opposite directions. The heat transfer end portion 66 and the heat transfer end portion 86 extend toward a side different from the side from which the protruding end portion 62 and the protruding end portion 82 protrude. From the side where the heat transfer end portion 66 and the heat transfer end portion 86 extend, neither the protruding end portion 62 nor the protruding end portion 82 protrudes.

外装ケース４は、ラミネートフィルム（絶縁シート）を角底カップ形状に形成したものである。ラミネートフィルムは、アルミニウム等の金属シートに、接着材層を介して、内表面側にポリプリピレン、外表面側にナイロンを重ね合せて構成されている。外装ケース４は、表面側ラミネートフィルムと裏面側ラミネートフィルムの間に電極体１０を配置し、電極体１０の周囲に形成される周縁部４２を熱溶着して袋状に閉じたものである。内表面側のポリプリピレン同士が直接に接触する部分ではポリプリピレン同士が熱溶着している。内表面側のポリプリピレンの間に正端子６が位置しているところでは、ポリプリピレンが正端子６に熱溶着している。内表面側のポリプリピレンの間に負端子８が位置しているところでは、ポリプリピレンが負端子８に熱溶着している。正端子６と負端子８は、ポリプリピレンによって絶縁されている。外装ケース４の内外は、内表面側のポリプリピレンと外表面側のナイロンによって絶縁されている。ラミネートフィルムは絶縁シートであることが理解される。   The outer case 4 is formed by forming a laminated film (insulating sheet) into a square bottom cup shape. The laminate film is configured by superposing polypropylene on the inner surface side and nylon on the outer surface side on a metal sheet such as aluminum via an adhesive layer. The outer case 4 is formed by disposing the electrode body 10 between the front surface side laminate film and the back surface side laminate film, and thermally sealing the peripheral edge portion 42 formed around the electrode body 10 and closing it in a bag shape. Polypropylenes are heat-welded with each other at the portion where the inner surface side polypropylenes are in direct contact with each other. The polypropylene is thermally welded to the positive terminal 6 where the positive terminal 6 is located between the polypropylene on the inner surface side. Where the negative terminal 8 is positioned between the polypropylene on the inner surface side, the polypropylene is thermally welded to the negative terminal 8. The positive terminal 6 and the negative terminal 8 are insulated by polypropylene. The inside and outside of the exterior case 4 are insulated by the inner side polypropylene and the outer surface side nylon. It is understood that the laminate film is an insulating sheet.

図２に、本実施例の電池２を交互に表裏を反転させ、１０個重ねて直列に接続した組電池２０を示す。組電池２０では、電池２の伝熱端部６６が延出している周縁部４２と、隣接する電池２の伝熱端部８６が延出している周縁部４２との間の空間領域３０に冷却風を流すことで、各電池２の冷却試験を行った。なおこの試験を行うに当っては、破線で示す上側絶縁カバー７ａを設置し、正端子６の突出端部６２と負端子８の突出端部６８を冷却風経路から分離することによって、突出端部６２と突出端部６８の絶縁が損なわれないようにした。   FIG. 2 shows an assembled battery 20 in which 10 batteries 2 according to the present embodiment are alternately turned upside down and are connected in series. In the assembled battery 20, cooling is performed in the space region 30 between the peripheral edge portion 42 where the heat transfer end portion 66 of the battery 2 extends and the peripheral edge portion 42 where the heat transfer end portion 86 of the adjacent battery 2 extends. The cooling test of each battery 2 was performed by flowing air. In carrying out this test, the upper insulating cover 7a indicated by a broken line is installed, and the protruding end 62 of the positive terminal 6 and the protruding end 68 of the negative terminal 8 are separated from the cooling air path, thereby causing the protruding end. The insulation between the portion 62 and the protruding end portion 68 is not impaired.

図３に、冷却試験の結果を示す。この試験では、本実施例の組電池２０から４Ｃの電流を取出しながら、前記空間領域３０に冷却風を流した。
第１比較例には、本実施例の電池と同じ寸法であり、正端子と負端子に伝熱端部が形成されていない電池を用いた。第２比較例として、本実施例の電池と同じ寸法であり、正端子と負端子に伝熱端部が形成されておらず、周縁部の幅を本実施例の電池よりも拡大した電池を用いた。
図３に示すように、第１比較例の電池では２０℃上昇したのに対し、本実施例の電池２では上昇温度が９℃に抑えられており、効率的な冷却効果が得られた。第２比較例の電池でも１５℃の温度上昇が観測されており、周縁部の幅を拡大しても冷却効率がさほど向上しないのに対し、伝熱端部を設けると冷却効率が効果的に向上することが確認された。本実施例の電池２では、冷却試験中に、正端子６と負端子８に、埃や塵等が堆積することがなく、また絶縁性の低下も見受けられず、試験後も良好な電池性能を維持していた。 FIG. 3 shows the results of the cooling test. In this test, cooling air was supplied to the space region 30 while taking out a current of 4 C from the assembled battery 20 of this example.
In the first comparative example, a battery having the same dimensions as the battery of this example and having no heat transfer end formed on the positive terminal and the negative terminal was used. As a second comparative example, a battery having the same dimensions as the battery of the present example, the heat transfer end portion being not formed on the positive terminal and the negative terminal, and the width of the peripheral portion being larger than that of the battery of the present example. Using.
As shown in FIG. 3, the battery of the first comparative example increased by 20 ° C., whereas the battery 2 of the present example had an increased temperature of 9 ° C., and an efficient cooling effect was obtained. Even in the battery of the second comparative example, a temperature rise of 15 ° C. is observed, and even if the width of the peripheral portion is enlarged, the cooling efficiency is not improved so much, but if the heat transfer end portion is provided, the cooling efficiency is effectively improved. It was confirmed to improve. In the battery 2 of the present example, during the cooling test, no dust or dust accumulates on the positive terminal 6 and the negative terminal 8, no deterioration in insulation is observed, and good battery performance after the test. Was maintained.

（第２実施例）
図４は、第２実施例の電池の分解斜視図である。本実施例の電池は、第１実施例の電池と正端子及び負端子の構成が異なっている。その他の構成は第１実施例と変わるところがないため、同じ符号を付して重複説明を省略する。
本実施例の電池１０２では、正端子１０６の突出端部１６２が接合部１６４から電極体１０の捲回軸方向に延出し、外装ケース４の周縁部４２から突出している。同様に、負端子１０８の突出端部１８２が接合部１８４から電極体１０の捲回軸方向に延出し、外装ケース４の周縁部４２から突出している。正端子１０６の突出端部１６２と、負端子１０８の突出端部１８２は、反対方向に伸びている。
正端子１０６の伝熱端部１６６は、電極体１０の捲回軸方向と直交する方向に伸びている。ただし、外装ケース４の周縁部４２内に留まる長さに調整されている。同様に、負端子１０８の伝熱端部１８６は、電極体１０の捲回軸方向と直交する方向に伸びている。これもまた、外装ケース４の周縁部４２内に留まる長さに調整されている。正端子１０６の伝熱端部１６６と負端子１０８の伝熱端部１８６は、同一方向に伸びている。伝熱端部１６６と伝熱端部１８６は、周縁部４２に覆われており、周縁部４２から突出していない。伝熱端部１６６と伝熱端部１８６が伸びている辺からは、突出端部１６２も突出端部１８２も突出しない。 (Second embodiment)
FIG. 4 is an exploded perspective view of the battery of the second embodiment. The battery of this embodiment is different from the battery of the first embodiment in the configuration of the positive terminal and the negative terminal. Since other configurations are the same as those in the first embodiment, the same reference numerals are given and redundant descriptions are omitted.
In the battery 102 of this embodiment, the protruding end portion 162 of the positive terminal 106 extends from the joint portion 164 in the winding axis direction of the electrode body 10 and protrudes from the peripheral edge portion 42 of the outer case 4. Similarly, the protruding end portion 182 of the negative terminal 108 extends from the joint portion 184 in the winding axis direction of the electrode body 10 and protrudes from the peripheral edge portion 42 of the exterior case 4. The protruding end portion 162 of the positive terminal 106 and the protruding end portion 182 of the negative terminal 108 extend in opposite directions.
The heat transfer end 166 of the positive terminal 106 extends in a direction orthogonal to the winding axis direction of the electrode body 10. However, the length is adjusted to remain within the peripheral edge 42 of the outer case 4. Similarly, the heat transfer end 186 of the negative terminal 108 extends in a direction orthogonal to the winding axis direction of the electrode body 10. This is also adjusted to a length that remains in the peripheral edge 42 of the outer case 4. The heat transfer end 166 of the positive terminal 106 and the heat transfer end 186 of the negative terminal 108 extend in the same direction. The heat transfer end 166 and the heat transfer end 186 are covered with the peripheral edge 42 and do not protrude from the peripheral edge 42. From the side where the heat transfer end 166 and the heat transfer end 186 extend, neither the protruding end 162 nor the protruding end 182 protrudes.

図５に、本実施例の電池１０２を交互に表裏を反転させ、１０個重ね合せて直列に接続した組電池１２０を示す。組電池１２０では、伝熱端部１６６と伝熱端部１８６が延出している周縁部４２の辺とに沿って冷却風を流すことで、各電池１０２が効果的に冷却される。破線で示す右側絶縁カバー１０７ａと左側絶縁カバー１０７ｂを設置し、正端子１０６の突出端部１６２と負端子１０８の突出端部１６８を外界から隔離した状態で、各電池１０２を効果的に冷却することができる。
この組電池１２０でも、第１実施例と同等の冷却効果が得られ、端子上に埃や塵等が堆積することがなく、絶縁性の低下も見受けられず、試験後も良好な電池性能を維持していた。この組電池１２０では、冷却風を上部のみに送風すればよいため、冷却のための構成を簡素化することができた。 FIG. 5 shows an assembled battery 120 in which 10 batteries 102 according to the present embodiment are alternately turned upside down and 10 are stacked and connected in series. In the assembled battery 120, each battery 102 is effectively cooled by flowing cooling air along the heat transfer end 166 and the side of the peripheral edge 42 where the heat transfer end 186 extends. The right insulating cover 107a and the left insulating cover 107b indicated by broken lines are installed, and each battery 102 is effectively cooled in a state where the protruding end portion 162 of the positive terminal 106 and the protruding end portion 168 of the negative terminal 108 are isolated from the outside. be able to.
Even in this assembled battery 120, the cooling effect equivalent to that of the first embodiment is obtained, dust and dust do not accumulate on the terminals, no deterioration in insulation is observed, and good battery performance is obtained after the test. Was maintained. In this assembled battery 120, the cooling air has only to be blown to the upper part, so that the configuration for cooling can be simplified.

図６に、本実施例の電池１０２を平面方向に３個並置して直列に接続した組電池１２２を示す。組電池１２２は、表面側絶縁カバー１１７ａ裏面側絶縁カバー１１７ｂによって覆われる。両絶縁カバー１１７ａ，１１７ｂに設けられた空気経路１３２ａ，１３２ｂに冷却風を流すことで、各電池１０２の伝熱端部１６６，１８６が伸びている側の周縁部４２を冷却した。
この組電池１２２でも、第１実施例と同等の冷却効果が得られ、端子上に埃や塵等が堆積することがなく、絶縁性の低下も見受けられず、試験後も良好な電池性能を維持していた。また組電池１２２では、冷却風の導入箇所と排出箇所が１つずつで済み，冷却風を拡散させる必要がないため、冷却のための構成をさらに簡素化することができた。 FIG. 6 shows an assembled battery 122 in which three batteries 102 of this embodiment are juxtaposed in the plane direction and connected in series. The assembled battery 122 is covered with a front-side insulating cover 117a and a back-side insulating cover 117b. The cooling air was allowed to flow through the air paths 132a and 132b provided in the both insulating covers 117a and 117b, thereby cooling the peripheral portion 42 on the side where the heat transfer end portions 166 and 186 of each battery 102 are extended.
Even in this assembled battery 122, the cooling effect equivalent to that of the first embodiment can be obtained, dust and dust do not accumulate on the terminals, no deterioration in insulation can be seen, and good battery performance can be obtained after the test. Was maintained. Moreover, in the assembled battery 122, the introduction location and the discharge location of the cooling air are only required one by one, and it is not necessary to diffuse the cooling air, so that the configuration for cooling can be further simplified.

（第３実施例）
図７は、第３実施例の電池の分解斜視図である。本実施例の電池は、第１実施例の電池と正端子及び負端子の構成が異なっている。その他の構成は第１実施例と変わるところがないため、同じ符号を付して重複説明を省略する。
本実施例の正端子２０６の突出端部２６２と負端子２０８の突出端部２８２は、電極体１０の捲回軸方向と直交する方向に伸びており、外装ケースの周縁部４２を越える長さを備えている。突出端部２６２と突出端部２８２は同一方向に伸びている。
正端子２０６の接合部２６４は、電極体１０の正極未塗工部１２に溶接されている。負端子２０８の接合部２８４は、電極体１０の負極未塗工部１４に溶接されている。
正端子２０６の伝熱端部２６６は、電極体１０の捲回軸方向と直交する方向に、突出端部２６２と反対方向に伸びており、外装ケース４の周縁部４２を超えない長さを備えている。負端子２０８の伝熱端部２８６は、電極体１０の捲回軸方向と直交する方向に、突出端部２８２と反対方向に伸びており、外装ケース４の周縁部４２を超えない長さを備えている。伝熱端部２６６と伝熱端部２８６は同一方向に伸びている。 (Third embodiment)
FIG. 7 is an exploded perspective view of the battery of the third embodiment. The battery of this embodiment is different from the battery of the first embodiment in the configuration of the positive terminal and the negative terminal. Since other configurations are the same as those in the first embodiment, the same reference numerals are given and redundant descriptions are omitted.
In this embodiment, the protruding end 262 of the positive terminal 206 and the protruding end 282 of the negative terminal 208 extend in a direction perpendicular to the winding axis direction of the electrode body 10 and have a length exceeding the peripheral edge 42 of the outer case. It has. The protruding end 262 and the protruding end 282 extend in the same direction.
The joint portion 264 of the positive terminal 206 is welded to the positive electrode uncoated portion 12 of the electrode body 10. The joint portion 284 of the negative terminal 208 is welded to the negative electrode uncoated portion 14 of the electrode body 10.
The heat transfer end portion 266 of the positive terminal 206 extends in a direction orthogonal to the winding axis direction of the electrode body 10 in a direction opposite to the protruding end portion 262 and has a length that does not exceed the peripheral edge portion 42 of the outer case 4. I have. The heat transfer end 286 of the negative terminal 208 extends in a direction orthogonal to the winding axis direction of the electrode body 10 in the direction opposite to the protruding end 282 and has a length that does not exceed the peripheral edge 42 of the outer case 4. I have. The heat transfer end 266 and the heat transfer end 286 extend in the same direction.

本実施例の電池２０２では、正端子２０６及び負端子２０８の形状を簡易に構成することができる。   In the battery 202 of this embodiment, the shapes of the positive terminal 206 and the negative terminal 208 can be easily configured.

以上、本発明の具体例を詳細に説明したが、これらは例示にすぎず、特許請求の範囲を限定するものではない。特許請求の範囲に記載の技術には、以上に例示した具体例を様々に変形、変更したものが含まれる。
上記実施例では、正端子と負端子にそれぞれ伝熱端部が形成されていたが、これに限られるものではない。正端子又は負端子のいずれか一方に伝熱端部を形成してもよい。
上記実施例では、外装材として二枚のラミネートフィルムを使用していたが、これに限られるものではない。１枚のラミネートフィルムを折り曲げて３辺を溶着することによって、電極体を密閉収容してもよい。あるいは、外装材としてアルミ等の金属板に絶縁シートを貼付したものを使用してもよい。
上記実施例では、正極とセパレータと負極とセパレータの組を積層して捲回した電極体を使用していたが、これに限られるものではない。例えば正極とセパレータと負極とセパレータの組を積層しただけの電極体を使用してもよい。また、複数のセパレータを用いずに、一つのセパレータのみを用いてもよい。
また、本明細書または図面に説明した技術要素は、単独であるいは各種の組み合わせによって技術的有用性を発揮するものであり、出願時請求項記載の組み合わせに限定されるものではない。また、本明細書または図面に例示した技術は複数目的を同時に達成するものであり、そのうちの一つの目的を達成すること自体で技術的有用性を持つものである。 Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
In the said Example, although the heat-transfer end part was formed in the positive terminal and the negative terminal, respectively, it is not restricted to this. You may form a heat-transfer end part in any one of a positive terminal or a negative terminal.
In the above embodiment, two laminated films are used as the exterior material, but the present invention is not limited to this. The electrode body may be hermetically accommodated by bending one laminate film and welding three sides. Or what attached the insulating sheet to metal plates, such as aluminum, as an exterior material may be used.
In the said Example, although the electrode body which laminated | stacked and wound the group of the positive electrode, the separator, the negative electrode, and the separator was used, it is not restricted to this. For example, you may use the electrode body which laminated | stacked only the group of the positive electrode, the separator, the negative electrode, and the separator. Further, only one separator may be used without using a plurality of separators.
In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

第1実施例の電池の分解斜視図。1 is an exploded perspective view of a battery according to a first embodiment. FIG. 第1実施例の電池を接続した組電池の斜視図。FIG. 3 is a perspective view of an assembled battery to which the battery of the first embodiment is connected. 冷却試験の結果を示す図。The figure which shows the result of a cooling test. 第２実施例の電池の分解斜視図。The disassembled perspective view of the battery of 2nd Example. 第２実施例の電池を接続した組電池の斜視図。The perspective view of the assembled battery which connected the battery of 2nd Example. 第２実施例の電池を接続した組電池の斜視図。The perspective view of the assembled battery which connected the battery of 2nd Example. 第３実施例の電池の分解斜視図。The disassembled perspective view of the battery of 3rd Example.

符号の説明Explanation of symbols

２ ：電池、
４ ：外装ケース、
６ ：正端子、
８ ：負端子、
１０：電極体、
１２，１４：未塗工部、
４２：周縁部、
６２，８２：突出端部、
６４，８４：接合部、
６６，８６：伝熱端部 2: Battery,
4: Exterior case,
6: Positive terminal,
8: Negative terminal,
10: electrode body,
12, 14: Uncoated part,
42: peripheral part,
62, 82: projecting ends,
64, 84: joint part,
66, 86: Heat transfer end

Claims (4)

正極と負極を含む電極体と、
電極体の正極に接続されている正端子と、
電極体の負極に接続されている負端子と、
正端子の端部と負端子の端部が外部に突出している状態で電極体を収容しているケースを備えており、
そのケースは、表面側絶縁シートと裏面側絶縁シートが周縁で密着することによって形成されており、
前記正端子は、絶縁シートの密着周縁を越えて外部に突出する突出端部の他に、密着周縁内に留まって外部に突出しない伝熱端部を備えており、
前記負端子は、絶縁シートの密着周縁を越えて外部に突出する突出端部の他に、密着周縁内に留まって外部に突出しない伝熱端部を備えており、
前記正端子の伝熱端部と前記負端子の伝熱端部が、表面側絶縁シートと裏面側絶縁シートの密着周縁によって被覆されていることを特徴とする電池。 An electrode body including a positive electrode and a negative electrode;
A positive terminal connected to the positive electrode of the electrode body;
A negative terminal connected to the negative electrode of the electrode body;
It has a case that houses the electrode body with the end of the positive terminal and the end of the negative terminal protruding to the outside,
The case is formed by the front-side insulating sheet and the back-side insulating sheet being closely attached at the periphery,
The positive terminal includes a heat transfer end portion that stays in the contact edge and does not protrude outside, in addition to the protruded end portion that protrudes outside the contact edge of the insulating sheet.
The negative terminal, in addition to the protruding end protruding outside the contact edge of the insulating sheet, includes a heat transfer end that remains in the contact edge and does not protrude outside.
The battery, wherein the heat transfer end portion of the positive terminal and the heat transfer end portion of the negative terminal are covered with a contact peripheral edge of the front surface side insulating sheet and the back surface side insulating sheet. 正端子の伝熱端部と負端子の伝熱端部が、正端子も負端子も突出していない辺において、密着周縁によって被覆されていることを特徴とする請求項１の電池。   2. The battery according to claim 1, wherein the heat transfer end portion of the positive terminal and the heat transfer end portion of the negative terminal are covered with an adhesion peripheral edge at a side where neither the positive terminal nor the negative terminal protrudes. 正端子の伝熱端部と負端子の伝熱端部が、同一の辺において、密着周縁によって被覆されていることを特徴とする請求項２の電池。   The battery according to claim 2, wherein the heat transfer end portion of the positive terminal and the heat transfer end portion of the negative terminal are covered with a close peripheral edge on the same side. 請求項１から３のいずれか電池を電気的に複数個接続し、正端子の伝熱端部と負端子の伝熱端部を被覆している密着周縁に接する冷却媒体通路を設けた組電池。   An assembled battery comprising a plurality of batteries electrically connected to each other and having a cooling medium passage in contact with a close peripheral edge covering the heat transfer end of the positive terminal and the heat transfer end of the negative terminal. .
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