1354393 九、發明說明 【發明所屬之技術領域】 本發明係關於電池電極板成型設備。 * 【先前技術】 例如鋰電池正極材之類的電池電極，習知係在鋁箔等 金屬箔集電體的芯材上，塗佈著形成電極合劑的電極活性 φ 物質（LiC〇02 )，經乾燥後，再利用沖壓成型俾提高電極 活性物質的總體密度，此種習知技術有如專利文獻1。專 利文獻1中揭示，利用具備上下一對壓輥的雙輥軋（two-high mill)式輥壓裝置，沖壓成型出芯材上塗佈著電極活 性物質且經乾燥的電池電極板。 專利文獻1:日本專利特開平1 1 -3701號公報 【發明內容】 # (發明所欲解決之課題） 利用雙輥軋式輥壓裝置所沖壓成型的電池電極板，習 知爲寬度較窄，近年爲提升生產性等，便有提案將電池電 極板寬度變爲較寬。但是，當對寬電池電極板施行沖壓成 型時，因爲壓輥的長度將變長，因此即便輥壓時的單位面 積平均荷重相同，但是成型荷重（〇c成型輥壓時的單位面 積平均荷重X壓輥長度），將大於窄電池電極板沖壓成型 時的荷重，所以，若利用習知窄電池電極板沖壓成型時的 輥壓裝置壓輥與相同直徑的壓輥，對寬電池電極板施行沖 -5 - 1354393 壓成型的話，壓輥將因輥壓反力而產生較大的彎曲狀況。 因而爲防止此彎曲情況，便必須增加壓輥的直徑β 因而，習知對既定窄電池電極板施行輥壓的輥壓裝置 ，壓輥徑約7〇〇mm程度，但是爲能施行寬電池電極板輥 壓，必須將壓輥徑設爲1 200mm程度。 然而，因爲如上述爲使壓輥能因應寬電池電極板而施 行大徑化，將導致裝置大型化，因而現實問題較爲困難。 況且，假設將壓輥大徑化，因爲如上述成型荷重亦將增加 ，因而越將導致裝置大型化，且因爲輥的彎曲或扁平化， 因而在高壓下將趨於困難，甚且將發生電池電極板斷裂情 況，輥更換作業亦非常麻煩，故而將潛在生產性與品質降 低的問題。 本發明之目的在於提供一種即便爲提高所謂寬電池電 極板的電極活性物質總體密度，而對電池電極板施行沖壓 成型時，仍可解決上述問題點，可確實穩定的提供生產性 良好且高品質的電池電極板》 (供解決課題之手段） 本發明之電池電極板成型設備，係在芯材上塗佈著電 極活性物質的電池電極板進行方向上，從上游側朝下游側 依序配置反繞機、四輥軋式輥壓裝置、及捲繞機。此外， 本發明的電池電極板成型設備係可在反繞機與輥壓裝置之 間，設置張力賦予裝置，且可在輥壓裝置與捲繞機之間設 置張力賦予裝置，在輥壓裝置、與該輥壓裝置之電池電極 -6- 1354393 板進行方向下游側所配置的張力賦予裝置之間，設置厚度 檢測裝置》 再者，本發明的電池電極板成型設備中，輥壓裝置的 壓輥係直徑較小於雙輥軋式輥壓裝置的壓輥；輥壓裝置亦 可在上下一對的壓輥上設置賦予漸彎曲（increased bending)的摺彎機（bender)，亦可構成當脫離上下一對 壓輥時，便減少摺彎機漸彎曲的構造。 (發明之效果） 依照本發明的電池電極板成型設備，便可達下述各種 優越效果。 I) 即便電池電極板屬於寬廣狀態，仍可將輥壓裝置 的壓輥設爲小徑狀態，故可減少沖壓成型時的成型荷重。 II) 因爲可減少沖壓成型時的成型荷重，因而輥壓裝 置不致大型化，且亦可防止壓輥發生彎曲與扁平化狀況， # 所以，可在高壓下實施，況且因爲對電池電極板利用張力 賦予裝置賦予低張力，因而除較不易發生芯材斷裂情況之 外，尙因爲壓輥屬於小徑且輥更換作業亦趨於容易，故可 提升生產性，且沖壓成型後將可獲得高品質的電池電極板 〇 III) 當在輥壓裝置中設置摺彎機時，將可抵消因成型 荷重所造成的壓輥彎曲，即便電池電極板屬於寬廣狀態， 仍可將沖壓成型後的電池電極板之電極活性物質，形成矩 形形狀，且藉由合倂使用摺彎機，便可防止沖壓成型後的 1354393 電池電極板發生波浪等形狀不良狀況，將可更加提升沖壓 成型後的電池電極板品質。 iv)藉由電池電極板的芯材不致發生斷裂情況，便可 穩定的施行沖壓成型。 V)因爲輥壓裝置爲四輥軋式，且可將壓輥設爲小徑 ，因而可在高壓下施行沖壓成型，將可更加提升電池電極 板的電極活性物質總體密度，因而可達電池性能的提升。 【實施方式】 以下，針對本發明實施例與圖式一起進行説明。 第1圖〜第10圖所示係本發明一實施例。圖中，1係 反繞機，2係夾送輥，3係張力賦予裝置，4係輥壓裝置， 5係厚度檢測裝置，6係張力賦予裝置，7係夾送輥，8係 偏導輥（deflector roll )，9係捲繞機。反繞機1、夾送輥 2、張力賦予裝置3、輥壓裝置4、厚度檢測裝置5、張力 賦予裝置6、夾送輥7、偏導輥8及捲繞機9，係從電池電 極板1 〇進行方向D的上游側朝下游側依序配設。 電池電極板10係如第3圖、第4圖所示，在鋁箔製 金屬箔集電體的帶狀芯材11上下面，將形成電極合劑的 正極活性物質（LiC〇02 ) 12，朝長度方向形成相隔開間隔 的不連續塗佈形狀。正極活性物質12可塗佈於上下面中 的任一面。 張力賦予裝置3,6係對對供應給生產線的電池電極板 10，賦予不致使該電池電極板10發生斷裂狀況程度之低 -8- 1354393 張力的套口式裝置（looper device)，具備有：利用流體壓 缸13使垂直面内進行上下旋轉的機械臂14:旋轉自如的 樞接於機械臂14上的輥15;以及在固定位置處旋轉自如 樞接著的輥16;其中，藉由使輥15位於第1圖的實線位 置處，便形成可對電池電極板10賦予低張力的狀態。且 ，電池電極板10的張力控制係藉由控制著張力賦予裝置 3,6的輥15位置而可實施。 φ 然後，當對電池電極板10賦予低張力之際，輥16在 張力賦予裝置3側，將較輥15位於更靠近電池電極板1〇 進行方向D的下游側，而在張力賦予裝置6側則位於較輥 15更靠近電池電極板10進行方向D的上游側。且，張力 賦予裝置3，6並不僅限於本實施例，亦可使用浮動輥（ dancer roll)或夾送輥》 輥壓裝置4係四輥軋式，具備有：上下一對的小直徑 壓輥17,18，以及將壓輥17,18倒轉的上下一對大直徑倒 • 轉輥（backup roll) 19,20。所以，壓輥17,18的直徑D1 約300mm，而倒轉輥19,20的直徑D2則約700mm，壓輥 17,18係直徑較小於習知雙輥軋式輥壓裝置的壓輥。 再者，如第2圖所示，在輥壓裝置4的壓輥17，18二 軸端，透過軸箱21，22’設置著對壓輥17,18賦予漸彎曲 的流體壓活塞式摺彎機23。第2圖中，24,25係倒轉輥 19,20二軸端所設置的軸箱，26係藉由將軸箱24押下， 而執行電池電極板10沖壓成型用的空壓缸。 如第3圖所示，厚度檢測裝置5係具備有：框體27; -9- 1354393 在框體27上端側，配置呈位於較供應給生產線的電池電 極板10，更靠上方位置處的感測器本體28:框體27下端 側配置呈位於較上述電池電極板10，更靠下方位置的感測 器本體29;接收來自感測器本體2 8，29之信號的控制器 30;以及根據來自控制器30的信號，監視著電池電極板 10厚度的監視裝置31。監視裝置31設置於控制室中。且 ，厚度檢測裝置5在電池電極板10進入側與輸出側，具 備有夾送輕3 2,3 3 β 鲁 感測器本體28，2 9在第3圖中雖僅圖示1組而已，但 是實際上在電池電極板10寬度方向，依既定間隔設置複 數組。且，感測器本體28,2 9可採用X線、伽瑪線等放射 線式，或CCD方式等光學式等等" 其次，針對上述實施例的動作進行説明。另外，當電 池電極板10供應給生產線時，反繞機1、夾送輥2、張力 賦予裝置3的輥15,16、輥壓裝置4的壓輥17,18、倒轉輥 19,2 0、厚度檢測裝置5的夾送輥32,33、張力賦予裝置6 · 的輥16,15、夾送輥7、偏導輥8、及捲繞機9，係形成對 應於電池電極板10朝進行方向D的供應速度，進行旋轉 的狀態。 從反繞機1倒捲的電池電極板10，將從夾送輥2傳送 給張力賦予裝置3，並依適當角度捲繞於輥15,16上，而 賦予既定低張力，藉由傳送給輥壓裝置4並通過輥壓裝置 4的壓輥17，18間，且利用空壓缸26 (參照第2圖）的動 作而施行沖壓成型。 -10- 1354393 因此，電池電極板10的正極活性物質12，便將如第 2圖、第4圖所示，經壓縮並緻密化而提升總體密度。輥 壓裝置4將利用摺彎機23對壓輥17,18，如第5圖所示， 賦予使軸線方向二側的壓輥17,18，朝其輥距G1擴大方向 彎曲的漸彎曲，藉此當施行沖壓成型時，此輥距G1便將 由空壓缸26的輥壓力而抵消，因此便可將沖壓成型後的 正極活性物質12截面形狀，形成矩形狀的良好形狀。 φ 換句話說，當未利用摺彎機23施行漸彎曲的情況時 ，若使第2圖所示空壓缸26進行動作，壓輥17,18的軸 線方向二側，便將如第6圖所示，使間隙G2小於壓輥 17,18長度方向中間部，結果沖壓成型後的電池電極板1〇 正極活性物質12，便將如第7圖所示，在寬度方向二端部 形成朝寬度方向外側向下傾斜的部分12a，而形成不良形 狀，因而最好不要。 然而，若如第5圖所示施行漸彎曲的話，即便利用空 # 壓缸26施行沖壓成型，壓輥17，18的軸線方向二側間隙 G1’仍將與因空壓缸26所產生的成型荷重相抵消，因爲 壓輥17，18長度方向形狀係在抵接於正極活性物質12的 地方，形成略平坦形狀，因而沖壓成型後的電池電極板10 之正極活性物質12，便如第8圖所示，形成略平坦狀態， 可獲得良好形狀的產品。 再者，如第4圖所示，在電池電極板1〇上，依既定 間隔存在未塗佈正極活性物質12的部分。所以，若從未 施行漸彎曲的情況下，利用壓輥17,18對電池電極板1〇 -11 - 1354393 的正極活性物質12施行沖壓成型的狀態，電池電極板1〇 未途佈正極活性物質12的芯材11部分移動至上下壓輥 17，18間的話，爲相互靠近而呈彎曲狀態的上下壓輥17,18 長度方向中央處，除輕間間隙較小之外，尙有上面的壓輕 17掉落並碰撞到芯材11，而對芯材11造成衝擊將有導致 斷裂的顧慮。 在此，當於施行漸彎曲的情況下，施行沖壓成型之際 ’於電池電極板10的正極活性物質12部分脫離上下壓輥 17,18間之時，便減少利用空壓缸26所產生的漸彎曲力， 使第5圖所示壓輥17,18間的軸線方向二側輥距G1減少 。因此，壓輥17,18長度方向中央處的彎曲便將減少，輥 距將增加，結果，壓輥17便不致掉落，而不致對芯材11 造成衝撞，因而便可防止在電池電極板10的沖壓成型中 ，發生芯材11斷裂的情況。 若電池電極板10的正極活性物質12進行方向前端處 ，移動至上下壓輥17,18間的話，便再度增加漸彎曲力， 使漸彎曲回復至原本狀態。 經輥壓裝置4沖壓成型過的電池電極板1〇，將利用厚 度檢測裝置5檢測出厚度。換句話說，例如從感測器本體 2 8，29所放射出的放射線，由電池電極扳10面進行反射， 並折返感測器本體28,29中。所以，來自感測器本體 28,29的信號便將提供給控制器30，經控制器30施行處 理後，便提供給監視裝置31。因而在監視裝置31中，便 顯示出如電池電極板10的長度方向位置與厚度。 1354393 經厚度檢測裝置5測量過厚度的電池電極板10，便朝 下游側輸送，並由張力賦予裝置6賦予低張力，且經由偏 導輥8捲取於捲繞機9上。 依照本實施例的話，即便電池電極板10較習知爲寬 廣，輥壓裝置4的壓輥17,18仍可設定爲小直徑，所以便 可減小沖壓成型時的成型荷重。另外，當施行某既定量的 沖壓成型時，成型荷重將受壓輥17,18直徑的影響，若壓 φ 輥17,18直徑較小的話，沖壓成型時的成型荷重將變小， 若壓輥17,18直徑較大的話，沖壓成型時的成型荷重將變 大。 換句話說，如第9圖所示，當壓輥17直徑爲較大直 徑Dol時，在輥壓成型中的壓輥17,18與電池電極板1〇 之接觸投影弧長L1，將如第10圖所示，較長於壓輥 17，18直徑爲小直徑D〇2時的接觸投影弧長L2 ( L1>L2) 。但是，此情況下，在第9圖、第10圖中設爲相同輥壓 • 量。此外，因爲「沖壓成型時的成型荷重=材料變形抵抗X 對壓輥材料的接觸投影面積」，且「接觸投影面積=接觸 投影弧長X壓輥17,18對材料在輕長度方向的接觸長度」 ，因此若將第9圖、第10圖所示壓輥17,18的長度方向 接觸長度，設爲相同長度的話，當接觸投影弧長L1大於 接觸投影弧長L2，如第9圖所示壓輥17,18的情況時，在 沖壓成型時的成型荷重將變大。所以，小直徑壓輥17,18 如上述，因爲接觸投影弧長L2較小，因而沖壓成型時的 成型荷重將變小。 -13- 1354393 再者，若壓輥17,18屬於小直徑的話，便可減小沖壓 成型時的成型荷重，結果亦可將倒轉輥19,20設爲小直徑 狀態》 再者，本實施例中，因爲可將壓輥17,18小直徑化， 且可減小沖壓成型時的成型荷重，因此輥壓裝置4將不致 大型化，且可防止壓輥17,18發生彎曲或扁平化的情況。 所以，輥壓裝置4便可在高壓下實施，且在對電池電極板 10利用張力賦予裝置3,6賦予低張力的情況下，當芯材 11脫離壓輥17,18間之時，因爲漸彎曲力將減少，因而亦 不致使芯材11發生斷裂情況，且因爲壓輥17,18屬於小 直徑，較容易利用摺彎機23施行漸彎曲，且輥更換作業 亦較容易，因而將可提升生產性，在沖壓成型後將可獲得 高品質的電池電極板1〇。 再者，因爲在輥壓裝置4中設置摺彎機23並施行漸 彎曲，因而便可與由空壓缸26的成型荷重所產生之壓輥 17,18彎曲相抵消，即便電池電極板10屬於寬廣狀態，仍 可將沖壓成型後的電池電極板1〇之正極活性物質12，形 成矩形形狀》而且，利用摺彎機23調整漸彎曲力，藉此 便可防止沖壓成型後的電池電極板1〇之正極活性物質12 ，在寬度方向端部發生波浪等不良形狀，可達更加提升沖 壓成型後的電池電極板10品質。 再者，如上述，藉由電池電極板10的芯材11不致發 生斷裂情況，便可穩定的施行沖壓成型。 再者，因爲輥壓裝置4屬於四輥軋式，且可將壓輥 -14- 1354393 17,18設爲小直徑，因而可施行高壓下的沖壓成型，且可 更加提升電池電極板10的正極活性物質12總體密度，可 達提升電池性能的效果。 另外，在本發明的電池電極板成型設備中，雖針對將 電池電極板使用爲電池正極的情況進行説明，惟不僅限於 電池正極，即便使用爲電池負極仍可實施，可因應電池電 極板寬度從寬廣至狹窄的各種寬度，此外在不脫逸本發明 φ 主旨的範疇内，當然可進行各種變更。 (產業上之可利用性） 本發明的電池電極板成型設備，係可利用於提升電極 活性物質總體密度，而對電池電極板施行沖壓成型的設備 【圖式簡單說明】 0 第1圖係本發明電池電極板成型設備之一實施例的槪 略側視圖。 第2圖係第1圖所示輥壓裝置的詳細正面圖。 第3圖係第1圖所示電池電極板成型設備，所使用的 厚度檢測裝置詳細側視圖。 第4圖係在利用第1圖所示電池電極板成型設備的輥 壓裝置，施行沖壓成型前的電池電極板、與經沖壓成型後 的電池電極板側視圖。 第5圖係利用第2圖所示摺彎機，對上下壓輥賦予漸 -15- 1354393 彎曲時的壓輥彎曲形狀正面圖。 第6圖係爲賦予漸彎曲時的壓輥彎曲形狀正面圖。 第7圖係在未施行漸彎曲的情況下，施行沖壓成型時 的電池電極板形狀剖視圖。 第8圖係在未施行漸彎曲情況下，施行沖壓成型時的 電池電極板形狀剖視圖。 第9圖係當壓輥爲大徑時，說明成型荷重將增加的壓 輥側視圖。 籲 第1 0圖係當壓輥爲小徑時，說明成型荷重將變小的 壓輥側視圖。 【主要元件符號說明】 1 :反繞機 2,7,32,33 :夾送輥 3,6 :張力賦予裝置 4 :輥壓裝置 5 :厚度檢測裝置 8 :偏導輥 9 :捲繞機 1 0 :電池電極板 1 1 :芯材 12 :正極活性物質 13 :流體壓缸 14 :機械臂 -16- 1354393 15，16 :輥 17，18 :壓輥 19,20 :倒轉輥 21，22,24,25 :軸箱 23 :摺彎機 26 :空壓缸 27 :框體 φ 28,29 :感測器本體 3 0 :控制器 3 1 :監視裝置 G1，G2 :間隙 L1，L2 :接觸投影弧長1354393 IX. Description of the Invention [Technical Field of the Invention] The present invention relates to a battery electrode plate forming apparatus. * [Prior Art] For example, a battery electrode such as a lithium battery positive electrode is coated with an electrode active φ substance (LiC〇02) forming an electrode mixture on a core material of a metal foil current collector such as aluminum foil. After drying, the overall density of the electrode active material is increased by press forming, and such a conventional technique is as disclosed in Patent Document 1. Patent Document 1 discloses that a battery electrode plate coated with an electrode active material and coated with a core material is press-formed by a two-high mill type roll press device having a pair of upper and lower press rolls. Patent Document 1: Japanese Laid-Open Patent Publication No. Hei No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. 1-1-3701. In recent years, in order to improve productivity, there have been proposals to make the width of the battery electrode plate wider. However, when the wide battery electrode plate is subjected to press forming, since the length of the press roll becomes long, even if the average load per unit area at the time of rolling is the same, the molding load (the average load per unit area when the 〇c is formed by rolling) The length of the press roll) is greater than the load at the time of press forming of the narrow battery electrode plate. Therefore, if the roll press roll and the press roll of the same diameter are used in the press forming of the conventional narrow battery electrode plate, the wide battery electrode plate is punched. -5 - 1354393 In the case of press molding, the press roller will have a large bending condition due to the rolling reaction force. Therefore, in order to prevent this bending, it is necessary to increase the diameter β of the pressure roller. Therefore, a rolling device for applying a rolling pressure to a predetermined narrow battery electrode plate is known, and the diameter of the pressing roller is about 7 mm, but a wide battery electrode can be applied. For plate roll pressure, the roll diameter must be set to about 1 200 mm. However, as described above, in order to increase the diameter of the pressure roller in response to the wide battery electrode plate, the size of the device is increased, and the practical problem is difficult. Moreover, it is assumed that the pressure roller is increased in diameter, because the molding load as described above will also increase, so that the larger the device will be caused, and because the roller is bent or flattened, it will become difficult under high pressure, and even a battery will occur. The electrode plate is broken and the roller replacement operation is also very troublesome, so the problem of potential productivity and quality is lowered. It is an object of the present invention to provide a method for press-forming a battery electrode plate even when the overall density of an electrode active material of a so-called wide battery electrode plate is increased, and the above problems can be solved, and a stable and high-quality production can be provided. (Battery Electrode Plate) (Means for Solving the Problem) The battery electrode plate forming apparatus of the present invention is configured such that the battery electrode plate coated with the electrode active material on the core material is arranged in the direction from the upstream side to the downstream side. Winding machine, four-roll rolling type rolling device, and winding machine. Further, the battery electrode plate forming apparatus of the present invention may be provided with a tension applying device between the rewinding machine and the rolling device, and a tension applying device may be provided between the rolling device and the winding machine, in the rolling device, A thickness detecting device is provided between the tension applying means disposed on the downstream side of the battery electrode -6 - 1354393 of the rolling device. Further, in the battery electrode plate forming apparatus of the present invention, the pressing roller of the rolling device The press roll is smaller than the press roll of the double roll type rolling device; the roll press device can also be provided with a bender for imparting bending on the upper and lower pair of press rolls, or can be configured to be detached When a pair of upper and lower pressure rollers are used, the structure in which the bending machine is gradually curved is reduced. (Effects of the Invention) According to the battery electrode plate forming apparatus of the present invention, various advantageous effects as described below can be achieved. I) Even if the battery electrode plate is in a wide state, the pressure roller of the rolling device can be set to a small diameter state, so that the molding load at the time of press forming can be reduced. II) Since the molding load at the time of press forming can be reduced, the rolling device is not enlarged, and the press roll can be prevented from being bent and flattened, so that it can be carried out under high pressure, and the tension is applied to the battery electrode plate. The low tension is imparted to the device, so that in addition to the fact that the core material is less likely to be broken, the press roll is a small diameter and the roll replacement operation tends to be easy, so that the productivity can be improved, and high quality can be obtained after press forming. Battery electrode plate 〇III) When a bending machine is installed in the rolling device, the bending of the pressure roller caused by the molding load can be offset, and even if the battery electrode plate is in a wide state, the battery electrode plate after the stamping can be formed. The electrode active material is formed into a rectangular shape, and by using a press brake, the electrode electrode plate of the 1354393 battery electrode plate after press forming can be prevented from being deformed by waves or the like, and the quality of the battery electrode plate after press forming can be further improved. Iv) By the fact that the core material of the battery electrode plate does not break, the stamping can be stably performed. V) Since the rolling device is of a four-roll type, and the pressing roller can be set to a small diameter, press forming can be performed under high pressure, which can further increase the overall density of the electrode active material of the battery electrode plate, thereby achieving battery performance. Improvement. [Embodiment] Hereinafter, embodiments of the present invention will be described together with drawings. 1 to 10 show an embodiment of the present invention. In the figure, 1 series rewinding machine, 2 series pinch roller, 3 series tension applying device, 4 series rolling device, 5 series thickness detecting device, 6 series tension applying device, 7 series pinch roller, 8 series deflecting roller (deflector roll), 9 series winder. Rewinding machine 1, pinch roller 2, tension applying device 3, rolling device 4, thickness detecting device 5, tension applying device 6, pinch roller 7, deflecting roller 8, and winder 9, from battery electrode plates 1 〇 The upstream side of the direction D is arranged in order toward the downstream side. As shown in FIG. 3 and FIG. 4, the battery electrode plate 10 has a positive electrode active material (LiC〇02) 12 forming an electrode mixture on the lower surface of the strip-shaped core material 11 of the aluminum foil metal foil current collector. The direction forms a discontinuous coating shape spaced apart. The positive electrode active material 12 can be applied to either of the upper and lower faces. The tension applying devices 3 and 6 are provided with a looper device for supplying the battery electrode plate 10 supplied to the production line with a tension of -8 to 1354393 which is not caused to cause the battery electrode plate 10 to be broken. a mechanical arm 14 for vertically rotating in a vertical plane by means of a fluid pressure cylinder 13: a roller 15 rotatably pivotally coupled to the robot arm 14; and a roller 16 rotatably pivoted at a fixed position; wherein, by means of a roller 15 is located at the solid line position of Fig. 1 to form a state in which low tension can be applied to the battery electrode plate 10. Further, the tension control of the battery electrode plate 10 can be carried out by controlling the position of the roller 15 of the tension applying devices 3, 6. φ Then, when low tension is applied to the battery electrode plate 10, the roller 16 is on the side of the tension applying device 3, and the lower roller 15 is located closer to the downstream side of the battery electrode plate 1 in the direction D, and on the side of the tension applying device 6 Then, it is located closer to the upstream side of the battery electrode plate 10 in the direction D than the roller 15. Further, the tension applying devices 3, 6 are not limited to the present embodiment, and a dancer roll or a pinch roll may be used. The roll pressing device 4 is a four-roll type, and has a pair of upper and lower small diameter press rolls. 17, 18, and a pair of upper and lower large diameter backup rolls 19, 20 that reverse the press rolls 17, 18. Therefore, the diameter D1 of the press rolls 17, 18 is about 300 mm, and the diameter D2 of the reverse rolls 19, 20 is about 700 mm, and the press rolls 17, 18 are smaller in diameter than the press rolls of the conventional twin roll type rolling apparatus. Further, as shown in Fig. 2, at the two axial ends of the press rolls 17, 18 of the rolling device 4, the through-shaft boxes 21, 22' are provided with a fluid-pressure piston type bend which imparts a progressive bending to the press rolls 17, 18. Machine 23. In Fig. 2, the 24, 25 series reverse rollers 19, 20 are provided with the axle box at the two-axis end, and the pneumatic cylinders for press forming the battery electrode plate 10 are executed by pushing the axle box 24 down. As shown in Fig. 3, the thickness detecting device 5 is provided with a frame body 27; -9- 1354393 is disposed on the upper end side of the frame body 27, and is disposed at a position higher than the battery electrode plate 10 supplied to the production line. The detector body 28 is disposed at a lower end side of the frame body 27 as a sensor body 29 located at a lower position than the battery electrode plate 10, and a controller 30 for receiving signals from the sensor body 2, 29; The signal from the controller 30 monitors the thickness of the battery electrode plate 10 by the monitoring device 31. The monitoring device 31 is disposed in the control room. Further, the thickness detecting device 5 is provided with a pinch light 3 2, 3 3 β Lu sensor main body 28 on the entry side and the output side of the battery electrode plate 10, and only one set is shown in Fig. 3 in Fig. 3, However, in practice, in the width direction of the battery electrode plate 10, a complex array is set at a predetermined interval. Further, the sensor bodies 28, 29 may be of a radiation type such as an X-ray or a gamma line, or an optical type such as a CCD method, etc. Next, the operation of the above embodiment will be described. Further, when the battery electrode plate 10 is supplied to the production line, the rewinding machine 1, the pinch roller 2, the rollers 15, 16 of the tension applying device 3, the pressing rollers 17, 18 of the rolling device 4, the reverse roller 19, 20, The pinch rolls 32, 33 of the thickness detecting device 5, the rolls 16, 15 of the tension applying means 6, the pinch rolls 7, the deflector rolls 8, and the winder 9 are formed in a direction corresponding to the direction in which the battery electrode plates 10 are oriented. The supply speed of D, the state of rotation. The battery electrode plate 10 which is rewinded from the rewinding machine 1 is conveyed from the pinch roller 2 to the tension applying device 3, and is wound around the rollers 15, 16 at an appropriate angle to impart a predetermined low tension, which is conveyed to the roller. The press device 4 is passed through between the press rolls 17, 18 of the roll press device 4, and is press-formed by the operation of the air cylinder 26 (see Fig. 2). -10- 1354393 Therefore, the positive electrode active material 12 of the battery electrode plate 10 is compressed and densified as shown in Figs. 2 and 4 to increase the overall density. In the rolling device 4, the press rolls 17, 18 are applied to the press rolls 17, 18 as shown in Fig. 5, and the press rolls 17 and 18 on the two sides in the axial direction are bent toward the direction in which the roll G1 is enlarged. When the press forming is performed, the roll gap G1 is offset by the roll pressure of the air cylinder 26, so that the cross-sectional shape of the positive electrode active material 12 after press forming can be formed into a rectangular good shape. φ In other words, when the bending machine 23 is not subjected to the progressive bending, if the air cylinder 26 shown in Fig. 2 is operated, the pressure rollers 17, 18 are on the two sides in the axial direction, as shown in Fig. 6. As shown in the figure, the gap G2 is made smaller than the intermediate portion in the longitudinal direction of the press rolls 17, 18, and as a result, the battery electrode plate 1 of the positive electrode active material 12 after press forming is formed into a width at both ends in the width direction as shown in Fig. 7. The portion 12a which is inclined downward toward the outside is formed into a bad shape, and thus it is preferable not to. However, if the gradual bending is performed as shown in Fig. 5, even if the press forming is performed by the empty cylinder 26, the axial side gap G1' of the press rolls 17, 18 will be formed by the air cylinder 26. The load is offset because the longitudinal direction of the press rolls 17, 18 is abutting against the positive electrode active material 12, forming a slightly flat shape, and thus the positive electrode active material 12 of the battery electrode plate 10 after press forming is as shown in Fig. 8. As shown, a slightly flat state is formed, and a good shape product can be obtained. Further, as shown in Fig. 4, a portion where the positive electrode active material 12 is not applied is present at a predetermined interval on the battery electrode plate 1A. Therefore, if the progressive bending is never performed, the positive electrode active material 12 of the battery electrode plate 1〇-11 - 1354393 is subjected to press forming by the press rolls 17, 18, and the battery electrode plate 1 is not provided with the positive electrode active material. When the core material 11 of the 12 is partially moved to the upper and lower pressure rollers 17, 18, the upper and lower pressure rollers 17 and 18 which are in a curved state close to each other are at the center in the longitudinal direction, except for the light gap, the upper pressure is applied. The light 17 falls and collides with the core material 11, and the impact on the core material 11 will cause a fear of breakage. Here, when the press forming is performed, when the positive electrode active material 12 of the battery electrode plate 10 is partially separated from the upper and lower press rolls 17, 18, the generation by the air cylinder 26 is reduced. The progressive bending force reduces the distance between the two side rollers G1 in the axial direction between the press rolls 17, 18 shown in Fig. 5. Therefore, the bending at the center in the longitudinal direction of the press rolls 17, 18 is reduced, and the roll pitch is increased, and as a result, the press roll 17 is not dropped, so that the core material 11 is not collided, so that the battery electrode plate 10 can be prevented. In the press forming, the core material 11 is broken. When the positive electrode active material 12 of the battery electrode plate 10 is moved to the front end of the positive electrode active material 12 and moved between the upper and lower pressure rollers 17, 18, the progressive bending force is again increased, and the gradually bending is returned to the original state. The battery electrode plate 1 which has been press-formed by the rolling device 4 is used to detect the thickness by the thickness detecting device 5. In other words, for example, the radiation emitted from the sensor bodies 2, 29 is reflected by the battery electrode 10 and folded back into the sensor bodies 28, 29. Therefore, the signals from the sensor bodies 28, 29 are supplied to the controller 30, which are supplied to the monitoring device 31 after being processed by the controller 30. Therefore, in the monitoring device 31, the position and thickness in the longitudinal direction of the battery electrode plate 10 are displayed. 1354393 The battery electrode plate 10 having a thickness measured by the thickness detecting device 5 is transported to the downstream side, and is supplied with a low tension by the tension applying device 6, and is taken up by the deflecting roller 8 on the winder 9. According to the present embodiment, even if the battery electrode plate 10 is conventionally wide, the press rolls 17, 18 of the rolling device 4 can be set to a small diameter, so that the molding load at the time of press forming can be reduced. In addition, when a certain amount of press forming is performed, the forming load will be affected by the diameter of the pressure roller 17, 18, and if the diameter of the pressure φ roller 17, 18 is small, the forming load at the time of press forming will become small, if the pressure roller When the diameter of 17,18 is large, the molding load at the time of press forming becomes large. In other words, as shown in Fig. 9, when the diameter of the pressure roller 17 is larger than the diameter Dol, the contact projection arc length L1 of the pressure roller 17, 18 in the roll forming with the battery electrode plate 1 will be as As shown in Fig. 10, the contact projection arc length L2 (L1 > L2) when the diameter of the pressure roller 17, 18 is a small diameter D 〇 2 is obtained. However, in this case, the same amount of roll pressure is set in the nineth and tenth figures. In addition, because "the molding load during press forming = material deformation resistance X contact projection area of the pressure roller material", and "contact projection area = contact projection arc length X pressure roller 17, 18 pairs of materials in the light length direction of contact length Therefore, if the lengthwise contact lengths of the press rolls 17, 18 shown in Figs. 9 and 10 are set to the same length, the contact projection arc length L1 is larger than the contact projection arc length L2, as shown in Fig. 9. In the case of the press rolls 17, 18, the molding load at the time of press forming becomes large. Therefore, the small-diameter pressing rolls 17, 18 are as described above, and since the contact projection arc length L2 is small, the molding load at the time of press forming becomes small. Further, if the press rolls 17, 18 are of a small diameter, the molding load at the time of press forming can be reduced, and as a result, the reverse rolls 19, 20 can be set to a small diameter state. In this case, since the press rolls 17, 18 can be made small in diameter and the molding load at the time of press forming can be reduced, the rolling device 4 is not enlarged, and the press rolls 17, 18 can be prevented from being bent or flattened. . Therefore, the rolling device 4 can be implemented under high pressure, and in the case where the battery electrode plate 10 is given a low tension by the tension applying devices 3, 6, when the core material 11 is separated from the press rolls 17, 18, The bending force will be reduced, so that the core material 11 does not break, and since the pressure rollers 17, 18 are of a small diameter, it is easier to use the bending machine 23 to perform the gradual bending, and the roller replacement operation is easier, so that the pressure roller can be lifted. Productivity, high-quality battery electrode plates will be obtained after press forming. Further, since the bending machine 23 is provided in the rolling device 4 and is gradually curved, it can be offset by the bending of the pressure rollers 17, 18 generated by the molding load of the air cylinder 26 even if the battery electrode plate 10 belongs to In a wide state, the positive electrode active material 12 of the battery electrode plate after press forming can be formed into a rectangular shape. Further, the bending force can be adjusted by the bending machine 23, thereby preventing the battery electrode plate 1 after press forming. The positive electrode active material 12 of ruthenium has a bad shape such as a wave at the end portion in the width direction, and the quality of the battery electrode plate 10 after press forming can be further improved. Further, as described above, by the fact that the core material 11 of the battery electrode plate 10 does not break, the press forming can be stably performed. Furthermore, since the rolling device 4 is of a four-roll type, and the pressing rolls 14-1354393 17, 18 can be set to a small diameter, press forming under high pressure can be performed, and the positive electrode of the battery electrode plate 10 can be further improved. The overall density of the active material 12 can increase the performance of the battery. Further, in the battery electrode plate forming apparatus of the present invention, the case where the battery electrode plate is used as the battery positive electrode will be described, but it is not limited to the battery positive electrode, and even if it is used as the battery negative electrode, the battery electrode plate width can be adjusted. It is a matter of course that various widths can be varied from wide to narrow, and various modifications can be made without departing from the scope of the invention. (Industrial Applicability) The battery electrode plate forming apparatus of the present invention is a device which can be used for press-forming a battery electrode plate by raising the overall density of the active material of the electrode [Simplified drawing] 0 Fig. 1 A schematic side view of one embodiment of a battery electrode plate forming apparatus of the invention. Fig. 2 is a detailed front view of the rolling device shown in Fig. 1. Fig. 3 is a detailed side view of the thickness detecting device used in the battery electrode plate forming apparatus shown in Fig. 1. Fig. 4 is a side view showing a battery electrode plate before press forming and a battery electrode plate after press forming by using a roll press device of the battery electrode plate forming apparatus shown in Fig. 1. Fig. 5 is a front view showing the curved shape of the press roll when the upper and lower press rolls are given a -15 - 1354393 bending by the bending machine shown in Fig. 2. Fig. 6 is a front view showing the curved shape of the pressure roller when the bending is given. Fig. 7 is a cross-sectional view showing the shape of a battery electrode plate at the time of press forming without performing the gradual bending. Fig. 8 is a cross-sectional view showing the shape of a battery electrode plate when press forming is performed without performing a gradual bending. Fig. 9 is a side view of the pressure roller in which the molding load is increased when the pressure roller is large. In the 10th figure, when the pressure roller is a small diameter, the side surface of the pressure roller whose forming load will become smaller will be described. [Description of main component symbols] 1 : Rewinding machine 2, 7, 32, 33: pinch roller 3, 6: tension applying device 4: rolling device 5: thickness detecting device 8: deflecting roller 9: winder 1 0: battery electrode plate 1 1 : core material 12 : positive electrode active material 13 : fluid pressure cylinder 14 : robot arm - 16 - 1354393 15, 16 : roller 17, 18 : pressure roller 19, 20 : reverse roller 21, 22, 24 , 25 : Axle box 23 : Bending machine 26 : Air compressor 27 : Frame φ 28, 29 : Sensor body 3 0 : Controller 3 1 : Monitoring device G1, G2 : Clearance L1, L2 : Contact projection arc long