201131863 六、發明說明： 【發明所屬之技術領域】 本發明係關於在複數個可充電的電池之端部電極上熔 接引線板（lead plate)而構成的電池包（battery pack) ’特別是關於透過引線板將各個電池進行散熱的電池包。 【先前技術】 將複數個電池用引線板串聯或並聯連接的電池包，對 各個電池高效率地進行散熱是重要的。特別是，串聯或並 聯連接多數個、並且充放電的電流大的電池包，電池的發 熱量較大，對電池的發熱高效率地進行散熱是重要的。爲 了實現該散熱，從連接於電池的引線板進行散熱的電池包 已被開發出（參照日本特開2 005 -3 1 745 6號公報）。 日本特開2005 -3 1 745 6號公報的電池包，是在引線板 設置引線突出部，利用該引線突出部對引線板進行散熱， 透過引線板對電池進行散熱。該結構的電池包由於利用引 線突出部進行散熱，難以增大散熱面積。另外，由於該引 線突出部連接於電池的端部電極而具有電位，無法讓其朝 外裝殼體的外部突出而進行散熱。 爲了增大散熱面積，利用外裝殼體進行散熱的電池包 也已被開發出（參照日本特開200 1 -7 6696號公報）。 日本特開2001-76696號公報的電池包，是在外裝殼 體內收容複數個圓筒型二次電池，並在外裝殼體上設置散 熱部。在外裝殻體內所收容的中央部的電池附近配置集熱 -5- 201131863 部’將該集熱部的熱通過熱導管（heat pipe )向外裝殼體 的散熱部傳導，進行散熱。該結構將電池的熱傳導至集熱 部，將該集熱部的熱通過熱導管傳導至外裝殼體的散熱部 ’向外部進行散熱。該結構的電池包，爲了散熱需要設置 集熱部及熱導管等專用的構件，存在散熱所需的結構較爲 複雜的缺點。 【發明內容】 本發明是爲了解決該缺點而開發完成的。本發明的重 要目的在於，提供一種散熱結構簡單，並且可將各個電池 的熱有效地向外裝殻體的外部進行散熱的電池包。 本發明的電池包具備：複數個可充電的電池1、連接 在該電池1的端部電極1A上之引線板3、以及收容藉由 該引線板3來連接電池1的電池組9之外裝殻體2.。外裝 殼體2，在相對置的面之至少一面上具有對電池1的熱進 行散熱的散熱殼體部1 〇，以端部電極1 A與該散熱殼體部 1 0的內面相對置的姿勢，將各個電池1以相互平行的姿勢 收容於外裝殼體2內。再者，電池包，是以將連接在電池 1的端部電極1 A上之引線板3配置於散熱殼體部1 0之內 面的方式，在外裝殼體2內收容電池組9，並將引線板3 熱耦合於散熱殼體部1〇的內面。外裝殻體2爲塑膠製， 在散熱殼體部1 〇的內面突出設置有與配設在內側的引線 板3以面接觸狀態進行熱耦合的內面突出部1 2。散熱殼體 部1 0，是使內面突出部1 2的外側形成凹部1 3，將電池1 -6 - 201131863 的熱從引線板3向散熱殼體部10的內面突出部12進行熱 傳導，從外裝殼體2向外部進行散熱。 上述的電池包具有：以簡單的散熱結構就能將各個電 池的熱有效地從外裝殻體向外部進行散熱的特徵》其原因 在於：上述的電池包，將連結在各個電池的端部電極上的 引線板，與突出設置在外裝殼體的散熱殼體部之內面的內 面突出部進行熱耦合，並且，藉由設置該內面突出部而在 外裝殻體形成凹部，以將電池的熱從引線板熱傳導至散熱 殼體部的內面突出部，從外裝殼體向外部進行散熱。該結 構使內面突出部以大面積且熱耦合狀態密合於引線板，可 以將引線板的熱高效率地向外部進行散熱。 另外，上述的電池包，在設置於全部的電池兩端之端 部電極上連接引線板，將該引線板的熱從外裝殼體的散熱 殻體部向外部進行散熱。該散熱結構還實現：能夠均勻冷 卻全部電池，減少各個電池的溫度差而進行均勻冷卻的特 徵。 本發明的電池包，可以在外裝殼體2之相對置的兩面 上設置散熱殼體部10。 該電池包，可以向外裝殻體的兩面上所設置的散熱殻 體部的內面突出部，從電池的兩端所連接的引線板進行熱 傳導，以將電池的熱非常高效率地向外部進行散熱。 本發明的電池包，可以在散熱殼體部1 0的凹部1 3上 一體成形地設有散熱片1 4。 該電池包，藉由設置在內面突出部的外側面上的散熱 201131863 片可增大散熱面積而高效率地進行散熱’又利用該散熱片 可補強內面突出部來防止變形。不發生變形的內面突出部 ，成爲與引線板的表面確實密合的狀態，可保持理想的熱 耦合，而良好地進行從引線板的熱傳導，高效率地進行散 熱。特別是，即使電池的熱將引線板加熱，加熱後的引線 板將內面突出部加熱而使強度降低，仍可藉由設置在外側 的散熱片補強而防止變形。從而，即使電池成爲被加熱的 狀態，內面突出部仍能以大面積且熱耦合狀態確實地密合 於引線板，而將引線板的熱高效率地向外部進行散熱。 本發明的電池包，可以具備將電池1配置於既定位置 之內殼4。該內殼4可設有供電池1插入並將其配置於既 定位置之兩端開口的電池安裝部22，並且在表面設有嵌接 凹部21，該嵌接凹部21，是將安裝在該電池安裝部22的 電池1的端部電極1 A上所連接的引線板3配置於既定位 置。再者，使設置在外裝殻體2的散熱殼體部1〇上的內 面突出部12的外形，成爲可插入嵌接凹部21而配置於既 定位置的形狀，內面突出部1 2被嵌接凹部2 1導引而以熱 耦合狀態配置於引線板3。 上述的電池包，可以將設置在外裝殼體上的內面突出 部確實地以不發生位置偏移的方式熱耦合於引線板，以將 電池的熱高效率地進行散熱。其原因爲，利用內殼，將引 線板和內面突出部配置於既定位置。 本發明的電池包，可在內殻4設置：將複數個引線板 3以平行的姿勢配置於既定位置的複數列嵌接凹部21，在 -8 - 201131863 外裝殻體2的散熱殻體部10上，設置插入各個嵌接凹部 21之複數個內面突出部12» 上述的電池包，可確實地防止鄰接的引線板發生短路 ，並透過各個引線板高效率地冷卻電池。 本發明的電池包，可在設置於外裝殻體2之內面突出 部1 2的突出面和引線板3之間夾持彈性熱傳導片7。 上述的電池包，可利用彈性熱傳導片，將引線板的熱 更高效率地熱傳導至內面突出部，高效率地進行散熱。 本發明的電池包，可將引線板3做成可彈性變形的金 屬板，並設置被彈性按壓於電池1的端部電極1 A的彈性 按壓片3 3。該彈性按壓片3 3可朝向端部電極1 A彈性地 突出，藉由端部電極1A按壓該彈性按壓片33以形成電連 接。 上述的電池包，不須將引線板利用點熔接等的方法連 結於電池的端部電極，就能將引線板確實地電氣連接於端 部電極，並使引線板在更理想的狀態下密合於內面突出部 的突出面，而在理想狀態下進行熱耦合。其原因在於：設 置在引線板上的彈性按壓片被端部電極彈性按壓而形成電 氣連接’並且利用該彈性按壓片按壓端部電極的反作用， 將引線板彈性按壓並密合於內面突出部的突出面。 本發明的上述及其他目的以及其特徵，參照圖式並根 據以下的詳細說明將更爲明白。 【實施方式】 -9 - 201131863 以下，根據圖式來說明本發明的實施例。第1圖至第 6圖的電池包，是在外裝殻體2內收容電池組9。電池組9 ，是將複數個可充電的電池1藉由引線板3串聯和並聯連 接。 [外裝殼體] 第2圖、第3圖及第6圖所示的外裝殼體2，是在對 置面上具有對電池1的熱進行散熱的散熱殼體部1〇而呈 箱形，在內部收容電池組9。雖然圖中的外裝殼體2在相 對置的兩面上設有散熱殼體部1〇，但是外裝殼體也可以只 在對置面的一面上設置散熱殼體部。圖中的外裝殼體2, 是使散熱殼體部1 〇的外形成爲方形，並藉由周壁1 1連結 該方形的周圍。該外裝殼體2將電池組9收容成：使各個 電池1相對於散熱殼體部10形成垂直姿勢，並配置成使 全部電池1的端部電極1A與散熱殻體部10的內面相對置 。以該姿勢將電池組9收容於外裝殻體2之電池包，各個 電池1是以相互平行的姿勢收容於外裝殻體2內。由於在 全部電池1的端部電極1 A上連接著引線板3，因此引線 板3是配設在電池1和散熱殼體部1 〇之間。 外裝殻體2，是將塑膠成形而製作出的。該外裝殻體 2，是在散熱殻體部10的內面突出設置內面突出部12，該 內面突出部〗2是與配設於內側的引線板3以面接觸狀態 進行熱耦合。內面突出部1 2之突出面與引線板3的表面 熱耦合。內面突出部12，可如第6圖所示將突出面直接密 -10- 201131863 合於引線板3的表面，或者如第7圖所示，可透過彈性熱 傳導片7來密合於引線板3的表面，而與引線板3進行熱 耦合。再者，外裝殻體2,是藉由在散熱殼體部1〇設置內 面突出部1 2而在其外側形成凹部1 3，並在該凹部1 3將散 熱片14 一體成形地設置。 第2圖至第4圖的電池組9在其兩面上，相互分開地 配置複數個引線板3。外裝殼體2，以與各個引線板3的 表面熱耦合的方式設有複數個內面突出部12。圖中的電池 組9，是將電池1裝入塑膠製的內殼4而配置於既定位置 。內殼4設有複數列的嵌接凹部2 1，俾將複數個引線板3 以平行的姿勢配置於既定位置。外裝殻體2如第2圖、第 3圖及第6圖所示，在散熱殻體部10上，設有用於插入各 個嵌接凹部21之複數個內面突出部12。內面突出部12的 外形，是成爲可插入嵌接凹部21以將電池組9配置於外 裝殼體2之既定位置的形狀。內面突出部12的外形，是 成爲比嵌接凹部21的內部形狀稍小的形狀，藉此能不發 生位置偏移地插入嵌接凹部21。該外裝殼體2，是將內面 突出部12插入內殼4的嵌接凹部21，而防止外裝殼體2 和電池組9間發生位置偏移。從而，該外裝殼體2可將電 池組9收容於既定位置，並將內面突出部！ 2的突出面與 引線板3的表面進行熱耦合。 第2圖、第3圖及第6圖所示的外裝殼體2，在凹部 13上以不從散熱殼體部1〇的表面突出的方式設有散熱片 1 4。圖中的散熱片1 4 ’是以相互交叉的方式配置複數列凸 -11 - 201131863 條。該散熱片1 4，可擴大散熱面積並補強散熱殼體部1 0 。特別是，以相互交叉的方式配置複數列凸條之散熱片1 4 ，可進行補強以防止內面突出部1 2的縱橫向變形，以將 突出面穩定地按壓於引線板3的表面上進行熱耦合。另外 ，以不從外裝殼體2的表面突出的方式設置凹部13之散 熱片14的結構，不致因散熱片1 4而使外裝殻體2的外形 增大，且能防止散熱片14突出而發生損傷。但是，凹部 的散熱片也可以加高而使其從外裝殼體的表面突出，以進 —步擴大散熱面積來提高散熱效率。以上的散熱片1 4雖 是設置在凹部13的凸條，但散熱片也可以是設置在凹部 之局部突出部、或將凹部成形爲凹凸形狀。 但是，外裝殼體的散熱殻體部，不一定要在內面突出 部的外側所形成的凹部設置散熱片。該外裝殼體，是使內 面突出部的內面以面接觸狀態與引線板進行熱耦合，而從 凹部的內面向外部進行散熱。 外裝殼體2，是採用ABS樹脂等成形，以周壁1 1的 中間爲邊界分割爲二個，採用螺釘鎖緊或嵌入式等的連結 方法進行固定。外裝殼體2，可按照電池包的用途、目的 、使用狀況以及要收容的電池1之外形及個數，而設計成 各種形狀。第1囫至第3圖所示的外裝殼體2，是分割成 第1外裝殼體2Α和第2外裝殼體2Β。圖示的外裝殼體2 ，爲了連結第2外裝殼體2Β和第1外裝殻體2Α，是沿著 外周面設有連結突出部1 5。將連結突出部1 5互相連結， 來連結第1外裝殼體2Α和第2外裝殼體2Β。再者，在該 -12- 201131863 狀態下用螺釘鎖緊，來固定外裝殻體2。第1外裝殻體2A 和第2外裝殼體2B呈大致對稱的形狀。 又在圖中’雖然外裝殼體2是以站立的狀態、亦即讓 一個周壁1 1的面朝下的狀態來使用，但是也可以讓外裝 殼體2的散熱殼體部10之設置有散熱片14的面朝下來使 用。此外，可以按照外裝殻體2的使用狀況，選擇包含外 裝殼體2之實施例的電池包設置面來使用。 [電池組] 第2圖至第5圖顯示電池組9。該等圖中的電池組9 具備：複數個可充電的電池1，以相互平行的姿勢鄰接配 設；內殼4，用來將電池1配置於既定位置；複數個引線 板3，熔接於配置在內殼4中之各個電池1的端部電極1A ，用來連接鄰接的電池1。 圖中的電池1是圓筒形電池，以兩端的端部電極1 A 位於同一面的方式將複數個排列爲多層多列。圖中的電池 組9，是排列成上下6層 '左右1 4列。鄰接列的電池1， 是排列成上下錯開而使相鄰的電池1位於其中間。該排列 ，能讓圓筒形的電池相互接近而排列成多列。但是，本發 明的電池包之電池的個數及配置並不限定爲該狀態。例如 ，也可以將電池配置爲棋盤格子狀。 [電池] 電池1是可充電的電池。圖中的電池包，電池1雖是 -13- 201131863 圓筒型電池，但是電池也可以使用方型電池或薄型電池。 在本實施形態，作爲電池1是使用圓筒型的鋰離子電池。 鋰離子電池適於大容量、大功率的電池包》其原因在於： 鋰離子電池可以增大相對於容積或重量的容量。但是，本 發明的電池包的電池並不限定爲鋰離子電池，也可以使用 鎳氫電池或鎳鎘電池等的二次電池。 [內殼] 第5圖所示的電池組9，在內殼4的電池安裝部22中 插入電池1以將其配置於既定位置。內殼4如第5圖所示 ，成形爲具有圓柱狀電池安裝部22的形狀。電池安裝部 22的內部形狀成形爲可供圓筒形電池插入。圖中的內殼4 設有8 4個電池安裝部2 2，以插入6層14列的電池1。電 池安裝部22在兩端開口。第5圖的電池包，將內殼4沿 著圓筒形電池1的長邊方向（圖中的左右方向）分割爲二 個。左右的內殻4，是將電池安裝部22的兩端開口而成形 爲可供圓筒形電池1插入的形狀。內殼4是由塑膠等絕緣 性構件進行成形而得的。內殼4 (將塑膠成形爲設有電池 安裝部22的形狀），藉由將電池1區分排列，可將複數 個電池1 —邊正確地定位一邊進行排列，且藉由將各電池 1分別獨立地分開，可防止誘發電池1的熱失控。分割爲 二個而成形的內殼4，將二個互相連結的狀態下，使電池 1的端部電極1 A從電池安裝部22的開口部露出外部。在 露出外部的端部電極1A上，採用點熔接或雷射熔接等的 -14- 201131863 方法熔接引線板3。作爲內殼4的塑膠材料，可以利用聚 碳酸酯。該材料強度大’具有對於漏出的鋰離子電池的電 解液難以溶解的性質。此外，ABS樹脂由於具有對於漏出 的鋰離子電池的電解液易於分解的性質，因而是不理想的 〇 內殼4’在將電池安裝部22的兩端開口的兩面上，成 形有嵌接凹部21，在該嵌接凹部21嵌入引線板3以將其 配置於既定位置。引線板3被嵌接凹部21導引而連接於 電池1的端部電極1A。從而，嵌接凹部21設置在：要配 置與端部電極1A連接之引線板3的位置上。 [引線板] 引線板3被內殻4的嵌接凹部21導引，與電池1的 端部電極1 A經由點熔接或雷射熔接而連接，以將鄰接的 電池1進行串聯和並聯連接。第2圖至第4圖的電池組9 ，是將複數個引線板3隔著絕緣間隙6相互平行排列，並 熔接於電池1的端部電極1 A上。第4圖的電池組9，在 電池1的一方端部（第4圖中是左上側的端部）排列7列 的引線板3，在各引線板3上連接6個x2列的電池1。另 外，在電池1的另一方端部（第4圖中是右下側的端部） 排列8列的引線板3，兩側的引線板3作爲輸出引線板3 x 來連接6個X 1列的電池1 ’在剩餘6列的引線板3上連接 6個x2列的電池1。該引線板3並聯連接處於同一列的6 個電池1，串聯連接處於相鄰列的電池1。也就是說’ 8 4 -15- 201131863 個電池1，是將6個並聯、14個串聯，亦即連接成6並聯 14串聯。再者，配置於電池1之另一方端部（第4圖中是 右下側的端部）兩側的輸出引線板3 X，是將連接成6並 聯1 4串聯的8 4個電池1之兩端的輸出連接到輸出端子3 6 。圖中的輸出引線板3 X在其側緣，設有用來與輸出端子 36連接的輸出部3B。輸出引線板3X，在並聯連接6個電 池的帶狀連接部之側緣，設有形成彎折之彎折片，將該彎 折片作爲輸出部3 B，來與配設於內殻4的側面之輸出端 子36連接。該輸出引線板3X，由於輸出部3B成爲寬度 大的板狀，因而可以減小輸出部3 B的電阻。再者，在第 4圖，配設於左側的輸出引線板3 X的輸出部3 B，經由保 護元件37連接於輸出端子36上。該保護元件37，是有過 電流流過就會遮斷電流之電流遮斷元件，例如可以使用熔 斷器或斷路器、PTC等。連接於兩側輸出部3B之輸出端 子3 6，從外裝殼體2的連結突出部1 5上所設置的開口部 16 (參照第2圖及第3圖）露出外部。再者，如第1圖所 示’藉由透過螺栓41連接於從外裝殼體2露出的輸出端 子3 6之電線40，向電子設備側進行供應。圖示的外裝殼 體2，將沿著在連結突出部丨5上露出的輸出端子3 6側部 而突出的絕緣壁1 7 —體成形，利用該絕緣壁1 7來保護輸 出端子36及電線40的連接部。 引線板3，是使用電阻小且熱傳導優異的金屬板，例 如鎳板’在鐵、鐵合金或者銅、銅合金等的表面上鍍鎳等 的金屬板。引線板3使用厚度最適於熔接的金屬板，例如 -16- 201131863 0.1 mm〜0.3 mm的金屬板。進行點熔接或雷射熔接的引線 板3無論是過厚或者過薄，都無法在理想的狀態下熔接於 電池1的端部電極1 A。過厚的引線板’爲了加熱使其熔 融需要大的熱能，因而對電池進行加熱的不良影響增大。 另外，過薄的引線板其電阻或熱阻大，並且沒有足夠的強 度。因此，引線板要考慮流經的電流及用途來設定成最佳 厚度。 第4圖和第6圖的引線板3，在與電池1的端部電極 1A進行點熔接的熔接部上，設有可減少熔接無效電流的 狹縫3 1。圖中的引線板3，在熔接部設有：縱向狹縫3 1 A 、以及在該縱向狹縫31A的上下與縱向狹縫31A分離的 橫向狹縫31B。該引線板3，將點熔接用的電極按壓在縱 向狹縫3 1 A的兩側，以將縱向狹縫3 1 A的兩側熔接於電 池1的端部電極1A。再者，引線板3在其上端，設有用 來與電路基板5連接之突出部3 A。引線板3的突出部3 A ，透過引線3 5連接於電路基板5。 熔接於電池1的端部電極1 A而進行連接之引線板3 ，是穩定地連接於電池1。第8圖的引線板3設有彈性按 壓片33，該彈性按壓片33是由可彈性變形的金屬板所製 作，而被彈性按壓於電池1的端部電極1 A。將彈性按壓 片3 3折彎成朝向端部電極1 A彈性地突出。該引線板3， 是被外裝殻體2的內面突出部12朝向端部電極1A按壓， 而使彈性按壓片3 3與端部電極1 A電氣連接。圖中的引線 板3設有：從端部電極1 A的中心朝外周以放射狀延伸之 -17- 201131863 複數個彈性按壓片3 3。各個彈性按壓片3 3的寬度從端部 電極1 A的中心朝向外周而變大。另外，在各個彈性按壓 片3 3之間設置間隙，各個彈性按壓片3 3是形成能互不干 涉地按壓端部電極1 A的形狀。該結構的引線板3，將複 數個彈性按壓片3 3獨立地按壓於端部電極1 A以進行電氣 連接，藉此抑制連接不良。其原因在於：其中任一彈性按 壓片3 3能與端部電極1 A進行電氣連接而抑制連接不良。 該引線板3，將彈性按壓片33按壓於端部電極1A，利用 其反作用而被彈性地按壓於內面突出部12的突出面。也 就是說，彈性按壓片3 3的彈性，將其前端部彈性按壓於 端部電極1 A上，且將引線板3之未設置彈性按壓片3 3的 部分彈性按壓於內面突出部12的突出面。從而，該結構 可抑制引線板3和端部電極1 A之間的連接不良，且能使 引線板3和內面突出部1 2以良好狀態接觸，而將端部電 極1A的熱有效地熱傳導至內面突出部12。另外，不致因 振動等而使引線板3脫離端部電極1 A，最適於像車輛用 的電池包那樣會受到振動的用途。 [電路基板] 連接各個引線板3的電路蕋板5，安裝有電子零件等 而構成電池1的充電控制和保護電路等，或安裝電池1之 剩餘容量的運算電路。另外，在電路基板5，執行剩餘容 量、異常、放電停止（指令）、充電停止（指令）等各種 資訊的運算、取得等，將這些資訊，通過導線3 8傳遞到 -18- 201131863 使用本電池包作爲電源的電子設備（例如電動機車）。然 後，根據這些資訊’電子設備執行各種控制。第1圖至第 3圖所示的外裝殼體2，在上面的周壁11設有導引導線38 的導線開口 1 8，從該導線開口 1 8將導線3 8引出到外部。 電路基板5’在第2圖至第5圖中，是固定並保持於 內殻4的上面。內殼4爲了將電路基板5導引至既定位置 ，是沿著電路基板5的周圍一體成形地設有複數個定位肋 23。電路基板5被內殻4上面之由定位肋23包圍的區域 所導引，用螺釘鎖緊固定於內殻4上。 安裝於電路基板5上的保護電路，是檢測電池1的過 充電或過放電來控制電流的電路、檢測電池1的過充電來 遮斷電流的電路等。保護電路，爲了檢測電池1的過充電 或過放電，係具備檢測電池1電壓的電壓檢測電路（未圖 示）。電壓檢測電路透過引線板3檢測各個電池電壓，防 止過充電或過放電。 [彈性熱傳導片] 第7圖所示的電池包，在外裝殼體2的內面和引線板 3的表面之間配設彈性熱傳導片7，透過該彈性熱傳導片7 ，使外裝殼體9的內面突出部12密合於引線板3的表面 。該彈性熱傳導片7夾在引線板3和外裝殼體2的內面之 間，將引線板3的熱向外裝殼體2進行熱傳導。該彈性熱 傳導片7，是可以彈性變形並且熱傳導良好、具有緩衝性 的薄片，是例如由矽樹脂構成的彈性片。雖未圖示，但是 -19- 201131863 彈性熱傳導片7讓一面與引線板3密合，另一面與外 體2的內面突出部1 2的內面密合，以將引線板3的 效率地向外裝殻體2進行熱傳導。其雙面與引線板3 裝殻體2密合的彈性熱傳導片7，將引線板3的熱高 地向外裝殼體2進行熱傳導，藉此將電池1的熱透過 板3向外裝殼體2的外部有效地散熱。彈性熱傳導片 要厚到能讓其兩面與引線板3和外裝殼體2的內面密 另外，還要薄到能將引線板3的熱高效率地向外裝殼 進行熱傳導。從而，該彈性熱傳導片7的厚度要考慮 線板3和外裝殻體2的密合性和熱傳導，例如設爲0 至3 mm。以上的彈性熱傳導片7，在將電池組9收容 裝殻體2內，且連結外裝殼體2的第1外裝殼體2A 2外裝殻體2B的狀態下，被稍微擠壓，利用彈性的 力而將一面密合於引線板3，將另一面密合於外裝殼 的內面。 以上的電池包如下述般進行組裝。 (1) 如第5圖所示，將複數個電池1朝既定的 插入內殼4的電池安裝部22。複數個電池1進行插入 使得圖中之上下排列的電池1成爲相同的方向，左右 的電池1成爲反向。在將全部的電池1插入內殼4的 安裝部2 2之後，連結一對內殼4。 (2) 如第4圖所示，在內殼4的上方固定電路基 。電路基板5被內殻4上面之定位肋23的內側導引 螺釘鎖緊進行固定。 裝殻 熱局 和外 效率 引線 7， 合。 體2 對引 • 5 mm 於外 和第 復原 體2 方向 ，以 排列 電池 板5 ，用 -20- 201131863 (3 )將引線板3設置於內殻4的嵌接凹部21，熔接 於各個電池1的端部電極1A進行固定。引線板3，藉由 點熔接或雷射熔接等的方法熔接於從內殼4的電池安裝部 22開口部露出的電池1之端部電極1 A。相互鄰接的引線 板3，排列成隔著絕緣間隙6而互不接觸。再者，將引線 板3的突出部3 A，透過引線3 5連接於電路基板5。 (4 )如第2圖和第3圖所示，將電池組9收容於外 裝殼體2內。此時，設置於外裝殼體2的散熱殻體部1〇 內面之內面突出部1 2，以與電池組9的引線板3相對置的 姿勢’使引線板3與內面突出部12的突出面進行熱耦合 。第6圖所示的內面突出部丨2，是使突出面直接密合於引 線板3的表面而進行熱耦合。另外，第7圖所示的電池包 ，是配置成在引線板3和外裝殼體2的內面之間夾持彈性 熱傳導片7的狀態，透過彈性熱傳導片7使內面突出部1 2 密合於引線板3的表面而進行熱耦合。電池組9收容於外 裝殼體2內，且使得引線板3以熱耦合狀態直接密合於外 裝殼體2的內面，或者透過彈性熱傳導片7而以熱耦合狀 態密合於外裝殼體2的內面。 (5 )連結外裝殼體2的第1外裝殼體2 A和第2外裝 殼體2B。 本發明的電池包可以良好地適用於電動輪椅、電動自 行車、電動機車、電動工具、作業用機器人等的將複數個 電池並聯連接且將其等串聯連接來增大功率加以使用的用 途。 21 - 201131863 儘管已經顯示並說明了本發明的不同的較佳實施形態 ，但對於所屬領域之技術人員來說顯然本發明並不限於所 揭露的特定實施形態，這些特定實施形態只是用於描述本 發明的槪念而並不能解釋爲對本發明範圍的限制，這也適 用於落入申請專利範圍中定義的本發明範圍之所有變形和 修改。本發明是以 2008年 9月11日於日本申請之 JP2008-2337 1 2申請案爲基礎，將其內容以參照的方式援 用於此。 【圖式簡單說明】 第1圖是本發明之一實施例的電池包之立體圖。 第2圖是第1圖所示的電池包之分解立體圖。 第3圖是第2圖所示的電池包之背面立體圖。 第4圖是第2圖所示的電池包的電池組之局部放大分 解立體圖。 第5圖是第4圖所示的電池組之分解立體圖。 第6圖是第1圖所示的電池包之主要部分放大局部截 面立體圖。 第7圖是本發明的其他實施例的電池包之分解立體圖 〇 第8圖是顯示引線板的其他例之放大立體圖。 【主要元件符號說明】 1 :電池 -22- 201131863 1 A :端部電極 2 :外裝殼體 2A :第1外裝殼體 2B :第2外裝殻體 3 :引線板 3X :輸出引線板 3 A :突出部 3 B :輸出部 4 :內殼 5 :電路基板 6 :絕緣間隙 7 :彈性熱傳導片 9 :電池組 1 〇 :散熱殼體部 1 1 :周壁 1 2 :內面突出部 13 :凹部 1 4 :散熱片 1 5 :連結突出部 1 6 :開口部 1 7 :絕緣壁 1 8 :導線開口 2 1 :嵌接凹部 22 :電池安裝部 -23- 201131863 2 3 :定位肋 3 1 :狹縫 3 1 A :縱狹縫 3 1 B :橫狹縫 3 3 :彈性按壓片 35 :引線 3 6 :輸出端子 3 7 :保護端子 3 8 :導線 4 0 :電線 4 1 :螺栓201131863 VI. Description of the Invention: [Technical Field] The present invention relates to a battery pack formed by welding a lead plate on an end electrode of a plurality of rechargeable batteries, particularly regarding a transmission lead A battery pack that dissipates heat from each battery. [Prior Art] A battery pack in which a plurality of battery lead plates are connected in series or in parallel is important for efficiently dissipating heat from each battery. In particular, it is important to connect a plurality of battery packs having a large current and a large charge and discharge in series or in parallel, and the heat generation of the battery is large, and heat dissipation of the battery is efficiently performed. In order to realize the heat dissipation, a battery pack that dissipates heat from a lead plate connected to a battery has been developed (refer to Japanese Laid-Open Patent Publication No. Hei. No. Hei. In the battery pack of Japanese Laid-Open Patent Publication No. Hei. No. 2005-31,745, the lead piece is provided with a lead protruding portion, and the lead protruding portion is used to dissipate heat from the lead plate, and the battery is radiated through the lead plate. In the battery pack of this configuration, since the heat is radiated by the lead projection, it is difficult to increase the heat dissipation area. Further, since the lead protruding portion is connected to the end electrode of the battery and has a potential, it cannot be caused to protrude toward the outside of the outer casing to dissipate heat. In order to increase the heat dissipation area, a battery pack that dissipates heat by the outer casing has also been developed (refer to Japanese Laid-Open Patent Publication No. 2001-76696). In the battery pack of Japanese Laid-Open Patent Publication No. 2001-76696, a plurality of cylindrical secondary batteries are housed in an outer casing, and a heat radiating portion is provided in the outer casing. A heat collection is disposed in the vicinity of the battery in the center portion of the outer casing. -5-201131863 The heat of the heat collecting portion is conducted through a heat pipe to the heat radiating portion of the outer casing to dissipate heat. This structure conducts heat of the battery to the heat collecting portion, and heats the heat collecting portion to the heat radiating portion of the outer casing through the heat pipe to dissipate heat to the outside. In the battery pack of this configuration, it is necessary to provide a dedicated member such as a heat collecting portion and a heat pipe for heat dissipation, and the structure required for heat dissipation is complicated. SUMMARY OF THE INVENTION The present invention has been developed in order to solve the disadvantages. An important object of the present invention is to provide a battery pack which is simple in heat dissipation structure and which can thermally dissipate the heat of each battery to the outside of the casing. The battery pack of the present invention comprises: a plurality of rechargeable batteries 1, a lead plate 3 connected to the end electrode 1A of the battery 1, and a battery pack 9 for accommodating the battery 1 by the lead plate 3 Housing 2. The outer casing 2 has a heat dissipating casing portion 1 散热 that dissipates heat of the battery 1 on at least one surface of the opposing surface, and the end electrode 1 A is opposed to the inner surface of the heat dissipating casing portion 10 In the posture, the batteries 1 are housed in the outer casing 2 in a mutually parallel posture. Further, in the battery pack, the lead plate 3 connected to the end electrode 1 A of the battery 1 is placed on the inner surface of the heat dissipation case portion 10, and the battery pack 9 is housed in the outer case 2, and The lead plate 3 is thermally coupled to the inner surface of the heat dissipation housing portion 1A. The outer casing 2 is made of plastic, and an inner surface projecting portion 1 2 that is thermally coupled to the inner lead plate 3 in a surface contact state is protruded from the inner surface of the heat dissipating casing portion 1 . In the heat dissipation case portion 10, the concave portion 13 is formed on the outer side of the inner surface protrusion portion 1 2, and the heat of the battery 1 -6 - 201131863 is thermally conducted from the lead plate 3 to the inner surface protrusion portion 12 of the heat dissipation case portion 10 . The outer casing 2 is radiated to the outside. The battery pack described above has a feature that the heat of each battery can be efficiently radiated from the outer casing to the outside with a simple heat dissipation structure. The reason is that the battery pack described above is connected to the end electrodes of the respective batteries. The upper lead plate is thermally coupled to the inner surface protrusion protruding from the inner surface of the heat dissipation case portion of the outer case, and the recess is formed in the outer case by providing the inner surface protrusion to discharge the battery The heat is thermally conducted from the lead plate to the inner surface protruding portion of the heat dissipation case portion, and heat is radiated from the outer case to the outside. This structure allows the inner protruding portion to be in close contact with the lead plate in a large-area and thermally coupled state, so that the heat of the lead plate can be efficiently radiated to the outside. Further, in the above battery pack, the lead plates are connected to the end electrodes provided at both ends of the battery, and the heat of the lead plates is radiated from the heat radiating case portion of the outer casing to the outside. The heat dissipating structure also realizes the feature of uniformly cooling all the batteries and reducing the temperature difference of each battery for uniform cooling. In the battery pack of the present invention, the heat radiating case portion 10 can be provided on the opposite sides of the outer casing 2. The battery pack can be heat-conducted from the lead plates connected to both ends of the battery by externally protruding portions of the heat dissipating casing portions provided on both sides of the casing to heat the battery to the outside very efficiently. Cool down. In the battery pack of the present invention, the fins 14 may be integrally formed on the recess 13 of the heat dissipating casing portion 10. The battery pack is provided with heat dissipation on the outer surface of the inner surface protrusion portion. The 201131863 sheet can increase the heat dissipation area to efficiently dissipate heat. The heat sink can be used to reinforce the inner surface protrusion portion to prevent deformation. The inner surface projecting portion which is not deformed is in a state of being in close contact with the surface of the lead plate, and the desired thermal coupling can be maintained, and heat conduction from the lead plate can be favorably performed, and heat can be efficiently dissipated. In particular, even if the heat of the battery heats the lead plate, the heated lead plate heats the inner protruding portion to lower the strength, and can be prevented from being deformed by the fin provided on the outer side. Therefore, even if the battery is heated, the inner protruding portion can be surely adhered to the lead plate in a large area and in a thermally coupled state, and the heat of the lead plate can be efficiently radiated to the outside. The battery pack of the present invention may include an inner casing 4 in which the battery 1 is placed at a predetermined position. The inner casing 4 may be provided with a battery mounting portion 22 for opening and arranging the battery 1 at both ends of a predetermined position, and is provided with a fitting recess 21 on the surface, which is to be mounted on the battery The lead plate 3 connected to the end electrode 1 A of the battery 1 of the mounting portion 22 is disposed at a predetermined position. Further, the outer shape of the inner surface projecting portion 12 provided on the heat radiating case portion 1 of the outer casing 2 is formed into a shape that can be inserted into the fitting recess 21 and placed at a predetermined position, and the inner surface protruding portion 12 is embedded. The recessed portion 21 is guided to be disposed in the lead plate 3 in a thermally coupled state. In the battery pack described above, the inner surface protruding portion provided on the outer casing can be thermally coupled to the lead plate without being displaced in position, so that the heat of the battery can be efficiently dissipated. The reason for this is that the lead plate and the inner surface projecting portion are disposed at a predetermined position by the inner casing. In the battery pack of the present invention, the inner casing 4 is provided with a plurality of rows of the engagement recesses 21 in which the plurality of lead plates 3 are arranged in a parallel position at a predetermined position, and the heat dissipation housing portion of the outer casing 2 is in the range of -8 - 201131863 In the case of the above-mentioned battery packs, the plurality of inner surface projections 12» inserted into the respective engagement recesses 21 are provided, so that the adjacent lead plates can be reliably prevented from being short-circuited, and the battery can be efficiently cooled by the respective lead plates. In the battery pack of the present invention, the elastic heat conductive sheet 7 can be sandwiched between the protruding surface provided on the inner surface protruding portion 12 of the outer casing 2 and the lead plate 3. In the battery pack described above, the heat of the lead plate can be thermally transferred to the inner protruding portion with higher efficiency by the elastic heat conducting sheet, and the heat can be efficiently dissipated. In the battery pack of the present invention, the lead plate 3 can be made into an elastically deformable metal plate, and the elastic pressing piece 3 3 which is elastically pressed against the end electrode 1 A of the battery 1 can be provided. The elastic pressing piece 3 3 is elastically protruded toward the end electrode 1 A, and the elastic pressing piece 33 is pressed by the end electrode 1A to form an electrical connection. In the above battery pack, the lead plate can be reliably electrically connected to the end electrode without connecting the lead plate to the end electrode of the battery by means of spot welding or the like, and the lead plate can be tightly bonded in a more ideal state. The protruding surface of the inner surface protrusion is thermally coupled in an ideal state. This is because the elastic pressing piece provided on the lead plate is elastically pressed by the end electrode to form an electrical connection ′, and the elastic pressing piece presses the end electrode to elastically press the lead plate elastically and adheres to the inner surface protruding portion. Prominent face. The above and other objects and features of the present invention will become more apparent from the detailed description. [Embodiment] -9 - 201131863 Hereinafter, an embodiment of the present invention will be described based on the drawings. The battery pack of Figs. 1 to 6 accommodates the battery pack 9 in the outer casing 2. In the battery pack 9, a plurality of rechargeable batteries 1 are connected in series and in parallel by a lead plate 3. [Outer case] The case 2 shown in Fig. 2, Fig. 3, and Fig. 6 is a case in which a heat dissipation case portion 1 that dissipates heat from the battery 1 is provided on the opposite surface. The battery pack 9 is housed inside. Although the outer casing 2 is provided with heat-dissipating casing portions 1 on opposite surfaces, the outer casing may be provided with a heat-dissipating casing portion on only one surface of the opposing surface. The outer casing 2 in the figure has a shape in which the outer shape of the heat dissipating casing portion 1 is square, and the periphery of the square is joined by the peripheral wall 1 1 . The outer casing 2 houses the battery pack 9 such that each of the batteries 1 forms a vertical posture with respect to the heat dissipation casing portion 10, and is disposed such that the end electrodes 1A of all the batteries 1 are opposed to the inner surface of the heat dissipation casing portion 10. Set. The battery pack 9 is housed in the battery pack of the outer casing 2 in this posture, and the batteries 1 are housed in the outer casing 2 in a mutually parallel posture. Since the lead plate 3 is connected to the end electrode 1 A of all the batteries 1, the lead plate 3 is disposed between the battery 1 and the heat dissipation case portion 1A. The outer casing 2 is formed by molding a plastic. In the outer casing 2, an inner surface projecting portion 12 is formed to protrude from the inner surface of the heat radiating casing portion 10, and the inner surface projecting portion 2 is thermally coupled to the lead plate 3 disposed on the inner side in surface contact. The protruding surface of the inner projection 1 2 is thermally coupled to the surface of the lead plate 3. The inner protruding portion 12 can be directly bonded to the surface of the lead plate 3 as shown in Fig. 6, or can be adhered to the lead plate through the elastic heat conducting sheet 7 as shown in Fig. 7. The surface of 3 is thermally coupled to the lead plate 3. Further, the outer casing 2 is formed with a concave portion 13 formed on the outer side of the heat radiating casing portion 1 by providing the inner protruding portion 1 2, and the heat radiating fin 14 is integrally formed in the concave portion 13 . The battery pack 9 of Figs. 2 to 4 is provided with a plurality of lead plates 3 spaced apart from each other on both sides thereof. The outer casing 2 is provided with a plurality of inner surface projections 12 in such a manner as to be thermally coupled to the surfaces of the respective lead plates 3. In the battery pack 9 shown in the drawing, the battery 1 is placed in a plastic inner casing 4 and placed at a predetermined position. The inner casing 4 is provided with a plurality of fitting recesses 2 1 , and a plurality of lead plates 3 are arranged in a parallel position at a predetermined position. As shown in Figs. 2, 3, and 6, the outer casing 2 is provided with a plurality of inner surface projecting portions 12 for inserting the respective fitting recesses 21 in the heat radiating casing portion 10. The outer shape of the inner protruding portion 12 is a shape that can be inserted into the fitting recess 21 to arrange the battery pack 9 at a predetermined position of the outer casing 2. The outer shape of the inner surface projecting portion 12 is slightly smaller than the inner shape of the fitting recessed portion 21, whereby the fitting recessed portion 21 can be inserted without causing a positional deviation. The outer casing 2 is such that the inner surface projecting portion 12 is inserted into the fitting recess portion 21 of the inner casing 4 to prevent positional displacement between the outer casing 2 and the battery pack 9. Therefore, the outer casing 2 can accommodate the battery pack 9 at a predetermined position and project the inner surface protrusion portion! The protruding faces of 2 are thermally coupled to the surface of the lead plate 3. The outer casing 2 shown in Fig. 2, Fig. 3, and Fig. 6 is provided with a fin 14 so as not to protrude from the surface of the heat dissipating casing portion 1 in the concave portion 13. The fins 1 4 ' in the figure are arranged in a manner of intersecting each other in a plurality of columns -11 - 201131863. The heat sink 14 can expand the heat dissipation area and reinforce the heat dissipation housing portion 10 . In particular, the heat dissipating fins 14 of the plurality of rows of ridges are arranged to intersect each other so as to be reinforced to prevent longitudinal and lateral deformation of the inner surface protrusions 1 2 so as to stably press the protruding surfaces against the surface of the lead plate 3. Thermally coupled. Further, the structure of the fins 14 of the recessed portion 13 is provided so as not to protrude from the surface of the outer casing 2, so that the outer shape of the outer casing 2 is not increased by the fins 14, and the fins 14 can be prevented from protruding. And the damage occurred. However, the fins of the recesses may be raised to protrude from the surface of the outer casing to further expand the heat dissipating area to improve the heat dissipating efficiency. Although the above fins 14 are ribs provided in the recesses 13, the fins may be partially protruded from the recesses or may be formed into a concavo-convex shape. However, the heat dissipating casing portion of the outer casing does not necessarily have to provide a fin for the recess formed on the outer side of the inner projecting portion. In the outer casing, the inner surface of the inner protruding portion is thermally coupled to the lead plate in a surface contact state, and heat is radiated from the inner surface of the concave portion to the outside. The outer casing 2 is formed by using ABS resin or the like, and is divided into two by the middle of the peripheral wall 11 as a boundary, and is fixed by a fastening method such as screwing or inserting. The outer casing 2 can be designed in various shapes in accordance with the purpose, purpose, use condition of the battery pack, and the shape and number of the battery 1 to be accommodated. The outer casing 2 shown in Figs. 1 to 3 is divided into a first outer casing 2'' and a second outer casing 2''. In order to connect the second outer casing 2 and the first outer casing 2, the outer casing 2 shown in the drawing is provided with a connecting projection 15 along the outer peripheral surface. The first protruding case 15 and the second outer case 2 are connected to each other by connecting the connecting protrusions 15 to each other. Furthermore, the outer casing 2 is fixed by screwing in the state of -12-201131863. The first outer casing 2A and the second outer casing 2B have a substantially symmetrical shape. Further, in the figure, the outer casing 2 is used in a standing state, that is, a state in which the surface of one peripheral wall 11 is facing downward, but the heat dissipating casing portion 10 of the outer casing 2 may be disposed. The fins 14 are used face down. Further, the battery pack setting surface including the embodiment of the outer casing 2 can be selected and used in accordance with the use condition of the outer casing 2. [Battery Pack] Figures 2 to 5 show the battery pack 9. The battery pack 9 in the figures includes: a plurality of rechargeable batteries 1 disposed adjacent to each other in a parallel posture; an inner casing 4 for arranging the battery 1 at a predetermined position; and a plurality of lead plates 3 welded to the configuration The end electrodes 1A of the respective batteries 1 in the inner casing 4 are used to connect the adjacent batteries 1. The battery 1 in the drawing is a cylindrical battery, and a plurality of rows are arranged in a plurality of layers in such a manner that the end electrodes 1 A at both ends are located on the same surface. In the figure, the battery pack 9 is arranged in a row of up and down 6 layers of left and right. The batteries 1 adjacent to the column are arranged to be shifted up and down so that adjacent batteries 1 are located therebetween. This arrangement allows the cylindrical batteries to be arranged in a plurality of rows in proximity to each other. However, the number and arrangement of the batteries of the battery pack of the present invention are not limited to this state. For example, the battery can also be configured in a checkerboard pattern. [Battery] Battery 1 is a rechargeable battery. In the battery pack shown in the figure, the battery 1 is a -13-201131863 cylindrical battery, but the battery can also use a square battery or a thin battery. In the present embodiment, a cylindrical lithium ion battery is used as the battery 1. Lithium-ion batteries are suitable for large-capacity, high-power battery packs because: Lithium-ion batteries can increase the capacity relative to the volume or weight. However, the battery of the battery pack of the present invention is not limited to a lithium ion battery, and a secondary battery such as a nickel hydride battery or a nickel cadmium battery may be used. [Inner case] In the battery pack 9 shown in Fig. 5, the battery 1 is inserted into the battery mounting portion 22 of the inner casing 4 to be placed at a predetermined position. The inner casing 4 is shaped to have a cylindrical battery mounting portion 22 as shown in Fig. 5. The internal shape of the battery mounting portion 22 is shaped to be insertable into a cylindrical battery. The inner casing 4 in the figure is provided with 84 battery mounting portions 2 2 for inserting the battery 1 of 6 layers and 14 columns. The battery mounting portion 22 is open at both ends. In the battery pack of Fig. 5, the inner casing 4 is divided into two along the longitudinal direction (the horizontal direction in the drawing) of the cylindrical battery 1. The left and right inner casings 4 are formed by opening both ends of the battery mounting portion 22 so as to be insertable into the cylindrical battery 1. The inner casing 4 is formed by molding an insulating member such as plastic. The inner casing 4 (shapes the plastic into the shape in which the battery mounting portion 22 is provided), by arranging the batteries 1 in a row, can arrange a plurality of batteries 1 while being correctly positioned, and by independently arranging the batteries 1 The ground separation prevents the thermal runaway of the battery 1 from being induced. The inner casing 4 which is divided into two is formed, and the end electrodes 1A of the battery 1 are exposed to the outside from the opening of the battery mounting portion 22 in a state in which the two are connected to each other. On the exposed end electrode 1A, the lead plate 3 is welded by a method of -14-201131863, such as spot welding or laser welding. As the plastic material of the inner casing 4, polycarbonate can be used. This material has a large strength & has a property that it is difficult to dissolve the electrolyte solution of the leaked lithium ion battery. Further, since the ABS resin has a property of being easily decomposed for the electrolyte of the leaked lithium ion battery, it is not preferable that the inner casing 4' is formed with the fitting recess 21 on both sides of the battery mounting portion 22 which are open at both ends. The lead plate 3 is fitted in the fitting recess 21 to be placed at a predetermined position. The lead plate 3 is guided by the fitting recess 21 to be connected to the end electrode 1A of the battery 1. Thereby, the fitting recess 21 is provided at a position where the lead plate 3 to be connected to the end electrode 1A is to be disposed. [Lead Plate] The lead plate 3 is guided by the fitting recess 21 of the inner casing 4, and is connected to the end electrode 1 A of the battery 1 by spot welding or laser welding to connect the adjacent batteries 1 in series and in parallel. In the battery pack 9 of Figs. 2 to 4, a plurality of lead plates 3 are arranged in parallel with each other via an insulating gap 6, and are welded to the end electrode 1 A of the battery 1. In the battery pack 9 of Fig. 4, seven rows of lead plates 3 are arranged at one end portion (the upper left end portion in Fig. 4), and six x 2 rows of batteries 1 are connected to the lead plates 3. Further, the other end portions of the battery 1 (the lower right end portion in Fig. 4) are arranged in eight rows of lead plates 3, and the lead plates 3 on both sides are connected as output lead plates 3 x to connect six X 1 columns. Battery 1 'Connects 6 x 2 columns of battery 1 to the remaining 6 columns of lead plates 3. The lead plate 3 is connected in parallel to the six batteries 1 in the same column, and the batteries 1 in the adjacent columns are connected in series. That is to say, ' 8 4 -15- 201131863 batteries 1 are 6 parallel, 14 connected in series, that is, connected into 6 parallel 14 series. Furthermore, the output lead plates 3 X disposed on the other end of the battery 1 (the end portion on the lower right side in FIG. 4) are 8 4 batteries 1 connected in series in parallel with 1 4 in series. The outputs at both ends are connected to the output terminals 3 6 . The output lead plate 3X in the figure is provided at its side edge with an output portion 3B for connection to the output terminal 36. The output lead plate 3X is provided with a bent piece forming a bend at a side edge of a strip-shaped connecting portion in which six batteries are connected in parallel, and the bent piece is used as an output portion 3 B and is disposed on the inner case 4 The output terminals 36 on the side are connected. In the output lead plate 3X, since the output portion 3B has a plate shape having a large width, the electric resistance of the output portion 3 B can be reduced. Further, in Fig. 4, the output portion 3B of the output lead plate 3X disposed on the left side is connected to the output terminal 36 via the protective member 37. The protective element 37 is a current interrupting element that interrupts current flow when an overcurrent flows, and for example, a fuse or a circuit breaker, a PTC, or the like can be used. The output terminal 36 connected to the both side output portions 3B is exposed to the outside from the opening portion 16 (see Figs. 2 and 3) provided in the connecting projection portion 15 of the outer casing 2. Further, as shown in Fig. 1, the electric wire 40 connected to the output terminal 36 exposed from the outer casing 2 via the bolt 41 is supplied to the electronic device side. The outer casing 2 shown in the drawing is formed by forming an insulating wall 17 projecting along a side portion of the output terminal 36 exposed on the connecting protruding portion 5, and the output terminal 36 is protected by the insulating wall 17 and The connection portion of the electric wire 40. The lead plate 3 is a metal plate having a small electric resistance and excellent heat conduction. For example, a nickel plate is plated with a metal plate such as nickel on the surface of iron, iron alloy, copper or copper alloy. The lead plate 3 uses a metal plate whose thickness is most suitable for welding, for example, -16-201131863 0.1 mm to 0.3 mm metal plate. The lead plate 3 subjected to spot welding or laser welding cannot be welded to the end electrode 1 A of the battery 1 in an ideal state regardless of whether it is too thick or too thin. The excessively thick lead plate ' requires a large amount of heat energy for heating to melt, and thus the adverse effect of heating the battery is increased. In addition, an excessively thin lead plate has a large electric resistance or thermal resistance and does not have sufficient strength. Therefore, the lead plate should be set to the optimum thickness in consideration of the current flowing through it and its use. The lead plate 3 of Figs. 4 and 6 is provided with a slit 31 which can reduce the welding ineffective current on the welded portion which is spot-welded to the end electrode 1A of the battery 1. The lead plate 3 in the figure is provided with a longitudinal slit 3 1 A and a lateral slit 31B which is separated from the longitudinal slit 31A at the upper and lower sides of the longitudinal slit 31A. The lead plate 3 presses the electrodes for spot welding on both sides of the longitudinal slit 3 1 A to weld both sides of the longitudinal slit 3 1 A to the end electrode 1A of the battery 1. Further, the lead plate 3 is provided at its upper end with a protruding portion 3A for connection to the circuit board 5. The protruding portion 3 A of the lead plate 3 is connected to the circuit board 5 through the lead 35. The lead plate 3, which is welded to the end electrode 1 A of the battery 1 and connected, is stably connected to the battery 1. The lead plate 3 of Fig. 8 is provided with an elastic pressing piece 33 which is made of an elastically deformable metal plate and is elastically pressed against the end electrode 1 A of the battery 1. The elastic pressing piece 3 3 is bent to elastically protrude toward the end electrode 1 A. The lead plate 3 is pressed by the inner surface protruding portion 12 of the outer casing 2 toward the end electrode 1A, and the elastic pressing piece 3 3 is electrically connected to the end electrode 1 A. The lead plate 3 in the drawing is provided with a plurality of elastic pressing pieces 3 3 extending radially from the center of the end electrode 1 A toward the outer circumference. The width of each of the elastic pressing pieces 3 3 becomes larger from the center of the end electrode 1 A toward the outer circumference. Further, a gap is provided between the respective elastic pressing pieces 3 3, and each of the elastic pressing pieces 3 3 is formed to be capable of pressing the end electrodes 1 A without being interfered with each other. In the lead plate 3 of this configuration, a plurality of elastic pressing pieces 3 3 are independently pressed against the end electrodes 1 A to be electrically connected, thereby suppressing connection failure. The reason for this is that any of the elastic pressing pieces 3 3 can be electrically connected to the end electrode 1 A to suppress the connection failure. The lead plate 3 presses the elastic pressing piece 33 against the end electrode 1A, and is elastically pressed against the protruding surface of the inner surface protruding portion 12 by the reaction. In other words, the elastic portion of the elastic pressing piece 33 elastically presses the front end portion thereof to the end electrode 1 A, and the portion of the lead plate 3 to which the elastic pressing piece 33 is not provided is elastically pressed against the inner surface protruding portion 12 Prominent surface. Therefore, this structure can suppress the connection failure between the lead plate 3 and the end electrode 1 A, and can make the lead plate 3 and the inner surface protrusion 1 2 contact in a good state, and heat the heat of the end electrode 1A efficiently. To the inner surface protrusion 12. Further, the lead plate 3 is not separated from the end electrode 1 A by vibration or the like, and is most suitable for use in a vibration like a battery pack for a vehicle. [Circuit board] The circuit board 5 of each of the lead plates 3 is connected, and an electronic component or the like is mounted to constitute a charge control and protection circuit of the battery 1, or an arithmetic circuit in which the remaining capacity of the battery 1 is mounted. In addition, on the circuit board 5, various information such as remaining capacity, abnormality, discharge stop (command), and charge stop (command) are calculated and acquired, and these pieces of information are transmitted to the -18-201131863 using the battery. An electronic device (such as an electric motor vehicle) that is used as a power source. Then, according to these information, the electronic device performs various controls. The outer casing 2 shown in Figs. 1 to 3 is provided with a wire opening 18 for guiding the wire 38 on the upper peripheral wall 11, and the wire 38 is led out to the outside from the wire opening 18. The circuit board 5' is fixed and held on the upper surface of the inner casing 4 in Figs. 2 to 5 . In order to guide the circuit board 5 to a predetermined position, the inner casing 4 is provided with a plurality of positioning ribs 23 integrally formed along the circumference of the circuit board 5. The circuit board 5 is guided by an area on the upper surface of the inner casing 4 surrounded by the positioning ribs 23, and is fixed to the inner casing 4 by screws. The protection circuit mounted on the circuit board 5 is a circuit that detects overcharge or overdischarge of the battery 1 to control current, and a circuit that detects overcharge of the battery 1 to interrupt current. The protection circuit is provided with a voltage detecting circuit (not shown) for detecting the voltage of the battery 1 in order to detect overcharging or overdischarging of the battery 1. The voltage detecting circuit detects the respective battery voltages through the lead plate 3 to prevent overcharging or overdischarging. [Elastic Thermal Conductive Sheet] In the battery pack shown in Fig. 7, an elastic heat conductive sheet 7 is disposed between the inner surface of the outer casing 2 and the surface of the lead plate 3, and the outer heat insulating sheet 7 is passed through the outer heat insulating sheet 7. The inner surface protrusion 12 is in close contact with the surface of the lead plate 3. The elastic heat conductive sheet 7 is sandwiched between the lead plate 3 and the inner surface of the outer casing 2, and heats the heat of the lead plate 3 to the outer casing 2. The elastic heat conductive sheet 7 is a sheet which is elastically deformable and has good heat conduction and cushioning properties, and is an elastic sheet made of, for example, enamel resin. Although not shown, the elastic heat conductive sheet 7 is attached to the lead plate 3 on one side, and the other surface is in close contact with the inner surface of the inner surface protrusion 1 2 of the outer body 2 to efficiently the lead plate 3 The outer casing 2 is thermally conducted. The elastic heat conducting sheet 7 which is double-sidedly adhered to the lead plate 3 housing case 2 thermally conducts the heat of the lead plate 3 to the outer casing 2, thereby housing the heat transmitting plate 3 of the battery 1 to the outside. The outside of 2 effectively dissipates heat. The elastic heat conductive sheet is thick enough to be bonded to both the lead plate 3 and the inner surface of the outer casing 2, and is thin enough to thermally conduct the heat of the lead plate 3 to the outer casing. Therefore, the thickness of the elastic heat conductive sheet 7 is considered in consideration of the adhesion and heat conduction of the wire board 3 and the outer casing 2, for example, set to 0 to 3 mm. In the state in which the battery pack 9 is housed in the casing 2 and the first outer casing 2A 2 of the outer casing 2 is attached to the outer casing 2B, the elastic heat conduction sheet 7 is slightly pressed and used. The elastic force causes one side to be in close contact with the lead plate 3 and the other side to be adhered to the inner surface of the outer casing. The above battery pack is assembled as follows. (1) As shown in Fig. 5, a plurality of batteries 1 are inserted into the battery mounting portion 22 of the inner casing 4 in a predetermined manner. A plurality of batteries 1 are inserted so that the batteries 1 arranged in the upper and lower directions in the figure are in the same direction, and the left and right batteries 1 are reversed. After the entire battery 1 is inserted into the mounting portion 2 2 of the inner casing 4, the pair of inner casings 4 are joined. (2) As shown in Fig. 4, the circuit base is fixed above the inner casing 4. The circuit board 5 is fixed by the inner guide screw of the positioning rib 23 on the upper surface of the inner casing 4. Housing heat and external efficiency leads 7, combined. The body 2 is in the direction of the outer and the second restoration body 2 to arrange the battery panel 5, and the lead plate 3 is placed in the fitting recess 21 of the inner casing 4 with -20-201131863 (3), and is welded to each battery 1 The end electrode 1A is fixed. The lead plate 3 is welded to the end electrode 1 A of the battery 1 exposed from the opening of the battery mounting portion 22 of the inner casing 4 by means of spot welding or laser welding. The lead plates 3 adjacent to each other are arranged so as not to contact each other with the insulating gap 6 interposed therebetween. Further, the protruding portion 3 A of the lead plate 3 is connected to the circuit board 5 through the lead 35. (4) As shown in Figs. 2 and 3, the battery pack 9 is housed in the outer casing 2. At this time, the inner surface projecting portion 12 provided on the inner surface of the heat dissipating case portion 1 of the outer casing 2 is placed in a posture opposite to the lead plate 3 of the battery pack 9 to cause the lead plate 3 and the inner surface projecting portion. The protruding faces of 12 are thermally coupled. The inner surface projecting portion 2 shown in Fig. 6 is such that the protruding surface is directly adhered to the surface of the lead plate 3 to be thermally coupled. Further, the battery pack shown in Fig. 7 is placed in a state in which the elastic heat conductive sheet 7 is interposed between the lead plate 3 and the inner surface of the outer casing 2, and the inner surface protruding portion 1 is transmitted through the elastic heat conductive sheet 7. The surface of the lead plate 3 is adhered to be thermally coupled. The battery pack 9 is housed in the outer casing 2, and the lead plate 3 is directly adhered to the inner surface of the outer casing 2 in a thermally coupled state, or is thermally coupled to the outer casing through the elastic heat conductive sheet 7. The inner face of the housing 2. (5) The first outer casing 2 A and the second outer casing 2B that connect the outer casing 2 are joined. The battery pack of the present invention can be suitably applied to an electric wheelchair, an electric bicycle, an electric motor vehicle, an electric power tool, a work robot, or the like, in which a plurality of batteries are connected in parallel and connected in series to increase power and use them. The present invention is not limited to the specific embodiments disclosed, but the specific embodiments are only used to describe the present invention. It is obvious to those skilled in the art that the present invention is not limited to the specific embodiments disclosed. The invention is not to be construed as limiting the scope of the invention, which is intended to cover all modifications and variations of the scope of the invention. The present invention is based on the JP 2008-2337 1 2 application filed on Sep. 11, 2008 in Japan, the disclosure of which is incorporated herein by reference. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a battery pack according to an embodiment of the present invention. Fig. 2 is an exploded perspective view of the battery pack shown in Fig. 1. Fig. 3 is a rear perspective view of the battery pack shown in Fig. 2. Fig. 4 is a partially enlarged perspective view showing the battery pack of the battery pack shown in Fig. 2. Fig. 5 is an exploded perspective view of the battery pack shown in Fig. 4. Fig. 6 is an enlarged partial cross-sectional perspective view showing the main part of the battery pack shown in Fig. 1. Fig. 7 is an exploded perspective view of a battery pack according to another embodiment of the present invention. Fig. 8 is an enlarged perspective view showing another example of the lead plate. [Explanation of main component symbols] 1 : Battery-22- 201131863 1 A : End electrode 2 : Outer casing 2A : First outer casing 2B : Second outer casing 3 : Lead plate 3X : Output lead plate 3 A : protruding portion 3 B : output portion 4 : inner case 5 : circuit board 6 : insulating gap 7 : elastic heat conductive sheet 9 : battery pack 1 〇 : heat radiating case portion 1 1 : peripheral wall 1 2 : inner surface protruding portion 13 : recess 1 4 : heat sink 1 5 : connecting protrusion 1 6 : opening portion 17 : insulating wall 18 : wire opening 2 1 : fitting recess 22 : battery mounting portion -23 - 201131863 2 3 : positioning rib 3 1 : slit 3 1 A : longitudinal slit 3 1 B : transverse slit 3 3 : elastic pressing piece 35 : lead 3 6 : output terminal 3 7 : protective terminal 3 8 : wire 4 0 : wire 4 1 : bolt