JP4680404B2 - Battery plate group inspection method and apparatus - Google Patents

Battery plate group inspection method and apparatus Download PDF

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JP4680404B2
JP4680404B2 JP2001082362A JP2001082362A JP4680404B2 JP 4680404 B2 JP4680404 B2 JP 4680404B2 JP 2001082362 A JP2001082362 A JP 2001082362A JP 2001082362 A JP2001082362 A JP 2001082362A JP 4680404 B2 JP4680404 B2 JP 4680404B2
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electrode plate
plate group
identification member
battery
group
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JP2002280056A (en
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兼之 牧野
浩 永田
利明 中西
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Panasonic Corp
Toyota Motor Corp
Panasonic Holdings Corp
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Panasonic Corp
Toyota Motor Corp
Matsushita Electric Industrial Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Description

【０００１】
【発明の属する技術分野】
本発明は、電池の極板群における極板枚数などを検査する極板群検査方法及び装置に関するものである。
【０００２】
【従来の技術】
蓄電池において、方形の負極板と正極板をセパレータを介して積層して構成した極板群を電解液とともに角形の電槽内に収容して成る角形蓄電池が知られている。このような角形蓄電池は、限られた空間内で電極面積を大きくすることで、極板の反応効率が向上するとともに、大電流を取り出すことができるという利点を有している。
【０００３】
上記極板群の製造工程においては、負極板と正極板が適正に積層されているか否かを検査する工程が必要である。そのため、例えば特開平１１−７３９４８号公報には、鉛蓄電池における正・負極板の間にセパレータを挿入して積層された極板群の適否を検査するために、極板群の一側端面に対して照明光を照射してＣＣＤカメラで撮像し、暗い像となる正・負極板の間で明るい像として撮像されるセパレータの画像データからセパレータの枚数やセパレータ間のピッチを演算し、標準値と比較して適否を判定するようにしたものが開示されている。
【０００４】
【発明が解決しようとする課題】
ところが、正・負の極板の一側縁部がそれぞれ反対側に突出され、それぞれ突出した一側縁部が集電体に対して接合するための金属光沢のあるリード部とされている極板群の場合には、上記特開平１１−７３９４８号公報に開示された検査方法を適用した場合、画像認識すると極板の一側端面とその奥にあるセパレータが共に白色画像となり、白と黒のコントラストが不安定になり、適正にカウントされないことが多くなり、規定枚数あるにも関わらず、多い・少ないの誤判定を発生するという問題がある。
【０００５】
本発明は、上記従来の問題点に鑑み、極板群の一側端面を画像認識した場合極板とセパレータの側端縁が共に白色画像となる場合でも適正にセパレータと極板を分別して認識できる電池の極板群検査方法及び装置を提供することを目的としている。
【０００６】
【課題を解決するための手段】
本発明の電池の極板群検査方法は、負極板と正極板をセパレータを介して積層して成る極板群を検査する電池の極板群検査方法であって、極板群は、各極板の一側端部がセパレータ側端縁からそれぞれ反対側に突出して積層されており、識別用部材を、セパレータの側端縁より突出している極板の一側端部を貫通させて配置し、極板群の一側端面に向けて、照明光を斜め方向から照射して、識別用部材に影による暗色部を形成し、識別用部材の長手方向に沿って、識別用部材に形成された暗色部と、極板の一側端縁での反射光による明白部とのコントラストを、極板群に対して照明光側に配置した画像認識手段で検出することにより、セパレータと極板とを分別して識別するものであり、極板群の一側端面を画像認識した時に白色画像となる極板の一側端縁の奥に同じく白色画像となるセパレータの側端縁が存在していても、識別用部材の暗色部と極板の一側端縁とのコントラストが大きい部分で各極板を検出するため、極板の枚数等の検査を適正に行うことができる。
【０００７】
また、識別用部材として、極板の一側端部に形成された位置決め穴に貫通させた位置決めピンを用いると、別途に識別用部材を用意して配置する必要がなく、照明光の照射方向を工夫するだけで容易かつ効率的に検査を行うことができる。
【０００８】
また、極板群を上方から押圧した状態で画像認識すると、各極板の一側端面を整列させることができ、極板の板面の傾斜によって一側端面で反射する照明光が正反射しなかったり、極板の浮き上がりによってコントラストの識別を行う検出領域から外れてしまったりして、適正に検出できなくなるというような恐れを防止できる。
【０００９】
また、識別用部材を複数配設するとともに各識別用部材ごとに画像認識すると、極板群における各極板の状態を全体的に検査でき、一端側では正常でも他端側で極板が位置ずれしているような欠陥の場合にも確実に検査できる。
【００１０】
また、識別用部材に対応して配置した明色の押圧具にて極板群を上方から押圧し、押圧具が背景となっている識別用部材の上端部を横断する検出線にて暗色部の位置を検出し、暗色部に対応する位置に検出領域を設定すると、画像データ上での検出領域の設定を自動的にかつ適切に行うことができ、適正に自動検査を行うことができる。
【００１１】
また、本発明の電池の極板群検査装置は、負極板と正極板をセパレータを介して積層して成る極板群を検査する電池の極板群検査装置であって、極板群は、各極板の一側端部がセパレータ側端縁からそれぞれ反対側に突出して積層され、かつ、セパレータ側端縁より突出している極板の一側端部を貫通するように配置した暗色部を形成する識別用部材が配設されており、極板群の一側端面に向けて照明光を斜め方向から照射して、識別用部材に影による暗色部を形成する照明手段と、極板群に対して照明光側に配置し、識別用部材の長手方向に沿って極板群の一側端面を画像認識する画像認識手段と、画像認識手段で認識された識別用部材に形成された暗色部と、極板の一側端縁での反射光による明白部とのコントラストを検出することにより、セパレータと極板とを分別して、極板枚数を検査する画像処理手段とを備えたものであり、上記検査方法を実施して極板の枚数等の検査を適正に行うことができる。
【００１２】
また、極板の一側端部に形成された位置決め穴に貫通させた位置決めピンを識別用部材として兼用すると、位置決めピンを識別用部材として利用することができる。
【００１３】
また、極板群を上方から押圧する押圧具を設けると、極板群を上方から押圧し、各極板の一側端面を整列させた状態で画像認識できる。
【００１４】
また、識別用部材を複数配設するとともに各識別用部材ごとに画像認識手段を配設すると、極板群における各極板の状態を全体的に検査できる。
【００１５】
また、識別用部材に対応して明色の押圧具を配設し、画像処理手段に、押圧具が背景となっている識別用部材の上端部を横断する検出線にて暗色部の位置を検出し、暗色部に対応する位置に検出領域を設定する手段を設けると、検出領域に設定を自動的にかつ適切に行うことができる。
【００１６】
【発明の実施の形態】
以下、本発明の電池の極板群の検査装置の一実施形態について、図１〜図５を参照しながら説明する。
【００１７】
図１、図２において、極板群１を構成する複数枚の負極板２と正極板３が各々の間にセパレータ４を介装した状態で積層されて搬送治具５上にセットされている。負極板２と正極板３はその一側縁部がそれぞれ反対側に突出されてリード部とされるとともにそのリード部に一対の位置決め穴が形成されており、搬送治具５の両側部にそれぞれ一対づつ立設されている位置決めピン６ａ、６ｂ、及び７ａ、７ｂにこれらの位置決め穴が嵌合されて負極板２及び正極板３が位置決めされて積層されている。
【００１８】
検査位置まで搬送治具５が搬送されてきて停止した状態で、その位置決めピン６ａ、７ａ、及び６ｂ、７ｂの配設位置に対応する位置に押圧具としての押圧ローラ８ａ、８ｂが配設され、これら押圧ローラ８ａ、８ｂにて極板群１を上方から押圧するように構成されている。また、これら押圧ローラ８ａ、８ｂの両端面は白色に着色されている。
【００１９】
極板群１の負極板２のリード部が突出している負極側の側面に向けて斜め方向から照明光を照射するように照明手段９が配設され、極板群１の正極板３のリード部が突出している正極側の側面に向けて斜め方向から照明光を照射するように照明手段１０が配設されている。
【００２０】
極板群１の両側部には、それぞれほぼ正対するように画像認識手段１１、１２が配設されている。各画像認識手段１１、１２は、位置決めピン６ａ、６ｂ、７ａ、７ｂの配設部分をそれぞれ画像認識するように一対の認識カメラ１１ａ、１１ｂ、１２ａ、１２ｂを備えている。これら画像認識手段１１、１２による画像データは画像処理手段１３に入力されている。
【００２１】
上記のように照明手段９、１０にて斜め方向から照明光を照射することによって、図３（ａ）、（ｂ）に示すように、位置決めピン６ａ、６ｂ、７ａ、７ｂには、照明手段９、１０とは反対側の側部に影による暗色部１４が形成され、負極板２や正極板３の側端面の反射光による明色部との間でコントラストが大きくなる。この暗色部１４を有する位置決めピン６ａ、６ｂ、７ａ、７ｂにて識別用部材１５が構成されている。
【００２２】
画像処理手段１３は、負極板２や正極板３の一側端縁と暗色部１４との間のコントラストを識別してこれら極板２、３の枚数を検査する。そのため、画像処理手段１３においては、図４（ａ）、（ｂ）に示すように、押圧ローラ８ａ、８ｂが背景となっている位置決めピン６ａ、６ｂ、７ａ、７ｂの上端部を横断するように検出線１６を設定し、この検出線１６に沿って明度変化を検出することによって暗色部１４の左右方向の位置を検出し、暗色部１４に対応する位置に暗色部１４の長手方向に沿って、極板群１の積層高さの全体をカバーする検出領域１７を設定する手段が設けられている。そして、設定された検出領域１７の長手方向に沿って明度の変化を検出し、負極板２や正極板３の側端面の反射光による明色部と暗色部１４との間の濃淡のエッジの数を検出するように構成されている。
【００２３】
以上の構成において、極板群１をセットされた搬送治具５が検査位置まで搬送されてきて停止すると、位置決めピン６ａ、７ａ、及び６ｂ、７ｂの配設位置に対応して配設された押圧ローラ８ａ、８ｂにて極板群１を上方から押圧し、照明手段９、１０にて斜め方向から照明光を照射することによって、セパレータ４の側端縁より突出している負極板２や正極板３の一側端部を貫通する位置決めピン６ａ、６ｂ、７ａ、７ｂに暗色部１４が形成されるとともに、金属光沢を呈する極板２、３の一側端面では照明光が反射されてその反射光にて明色となり、図３（ａ）、（ｂ）に示すように安定したコントラストが得られる。
【００２４】
この状態で、極板群１の一側端面の位置決めピン６ａ、６ｂ、７ａ、７ｂの配設部分を画像認識手段１１、１２で画像認識し、画像処理手段１３にて極板枚数などの検査を行う。その検査工程を図５を参照して説明すると、まず画像認識した画像データを入力した後、図４（ａ）、（ｂ）に示すように、押圧ローラ８ａ、８ｂが背景となっている識別用部材１５の上端部を横断する検出線１６にて暗色部１４の左右方向の位置を検出し、暗色部１４に対応する位置に極板群１を極板２、３の積層方向に縦断する検出領域１７を設定する。次に、検出領域１７の長手方向に沿って極板２、３の一側端縁での反射光による明色部と暗色部１４とのコントラストによる濃淡のエッジを順次検出する。次に、そのエッジ数が極板２、３の積層枚数に対応した適正な数であるか否かを判断し、適正な場合には枚数判定をＯＫとし、不適正な場合には枚数判定をＮＧとする。
【００２５】
本実施形態によれば、以上のように暗色部１４を形成する識別用部材１５としての位置決めピン６ａ、６ｂ、７ａ、７ｂを、セパレータ４の側端縁より突出している極板２、３の一側端部を貫通させて配置し、極板群１の一側端面に向けて照明光を照射して画像認識し、識別用部材１５の長手方向に沿って暗色部１４と極板２、３の一側端縁とのコントラストを識別して極板２、３の枚数などの検査をするので、明色部となる極板２、３の一側端縁の奥に同じく明色画像となるセパレータ４の側端縁が存在していても、各極板２、３を確実に検出することができ、極板２、３の枚数等の検査を適正に行うことができる。
【００２６】
また、照明手段９、１０による照明光を斜め方向から照射して位置決めピン６ａ、６ｂ、７ａ、７ｂに形成される影部にて暗色部１４を形成し、位置決めピン６ａ、６ｂ、７ａ、７ｂを識別用部材１５として利用しているので、別途に識別用部材１５を用意して配置する必要がなく、照明光の照射方向を工夫するだけで容易かつ効率的に検査を行うことができる。勿論、位置決めピン６ａ、６ｂ、７ａ、７ｂを用いない場合や、影部にて効果的に暗色部１４を形成できない場合などには、識別用部材１５を別途に配置してもよいことは言うまでもない。
【００２７】
また、押圧ローラ８ａ、８ｂにて極板群１を上方から押圧した状態で画像認識しているので、各極板２、３の一側端面を整列させることができ、極板２、３の板面の傾斜によって一側端面で反射する照明光が正反射しなかったり、極板２、３の浮き上がりによってコントラストの識別を行う検出領域１７から外れてしまったりすることを防止でき、極板２、３の一側端縁の反射光の均一化を図れ、安定した出力が得られて適正に検出することができる。
【００２８】
また、負極側と正極側のそれぞれの両側に各一対の位置決めピン６ａ、６ｂ、７ａ、７ｂを配設し、各々認識カメラ１１ａ、１１ｂ、１２ａ、１２ｂで画像認識するようにしているので、一端側では正常でも他端側で極板２、３が位置ずれした欠陥などの場合にも確実に検査でき、すべての認識カメラ１１ａ、１１ｂ、１２ａ、１２ｂによる認識結果が適正な場合にのみ後続工程に送るようにすることにより、欠陥品の発生を確実に防止することができる。
【００２９】
また、両端を白色にした押圧ローラ８ａ、８ｂを識別用部材１５として機能する位置決めピン６ａ、６ｂ、７ａ、７ｂに対応して配置し、識別用部材１５の上端部を横断する検出線１６にて暗色部１４の左右位置を検出し、暗色部１４に対応する位置に検出領域１７を設定しているので、画像データ上での検出領域１７の設定を自動的にかつ適切に行うことができ、適正に自動検査を行うことができる。
【００３０】
【発明の効果】
本発明の電池の極板群検査方法及び装置によれば、以上の説明から明らかなように、極板群は、各極板の一側端部がセパレータ側端縁からそれぞれ反対側に突出して積層されており、識別用部材を、セパレータの側端縁より突出している極板の一側端部を貫通させて配置し、極板群の一側端面に向けて、照明光を斜め方向から照射して、識別用部材に影による暗色部を形成し、識別用部材の長手方向に沿って識別用部材に形成された暗色部と、極板の一側端縁での反射光による明白部とのコントラストを、極板群に対して照明光側に配置した画像認識手段で検出することにより、セパレータと極板とを分別して、極板枚数などの検査をするようにしたので、極板群の一側端面を画像認識した時に白色画像となる極板の一側端縁の奥に同じく白色画像となるセパレータの側端縁が存在していても、識別用部材の暗色部と極板の一側端縁のコントラストが大きい部分で各極板を検出することができ、極板の枚数等の検査を適正に行うことができる。
【００３１】
また、識別用部材として、極板の一側端部に形成された位置決め穴に貫通させた位置決めピンを用いると、別途に識別用部材を用意して配置する必要がなく、照明光の照射方向を工夫するだけで容易かつ効率的に検査を行うことができる。
【００３２】
また、極板群を上方から押圧した状態で画像認識すると、各極板の一側端面を整列させることができ、極板の板面の傾斜によって一側端面で反射する照明光が正反射しなかったり、極板の浮き上がりによってコントラストの識別を行う検出領域から外れてしまったりして、適正に検出できなくなるというような恐れを防止できる。
【００３３】
また、識別用部材を複数配設するとともに各識別用部材ごとに画像認識すると、極板群における各極板の状態を全体的に検査でき、一端側では正常でも他端側で極板が位置ずれした欠陥の場合にも確実に検査することができる。
【００３４】
また、識別用部材に対応して配置した明色の押圧具にて極板群を上方から押圧し、押圧具が背景となっている識別用部材の上端部を横断する検出線にて暗色部の位置を検出し、暗色部に対応する位置に検出領域を設定すると、画像データ上での検出領域に設定を自動的にかつ適切に行うことができ、適正に自動検査を行うことができる。
【図面の簡単な説明】
【図１】本発明の電池の極板群検査装置の一実施形態における検査状態を示す斜視図である。
【図２】同実施形態における極板群を搬送治具にセットした状態の斜視図である。
【図３】同実施形態における認識画像を示し、（ａ）は負極板突出側、（ｂ）は正極板突出側の画面の説明図である。
【図４】図３の認識画像（ａ）、（ｂ）において、検査領域を設定して検査を行う方法の説明図である。
【図５】同実施形態における検査工程のフロー図である。
【符号の説明】
１ 極板群
２ 負極板
３ 正極板
４ セパレータ
６ａ、６ｂ、７ａ、７ｂ 位置決めピン
８ａ、８ｂ 押圧ローラ（押圧具）
９、１０ 照明手段
１１、１２ 画像認識手段
１１ａ、１１ｂ、１２ａ、１２ｂ 認識カメラ
１３ 画像処理手段
１４ 暗色部
１５ 識別用部材
１６ 検出線
１７ 検出領域[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrode plate group inspection method and apparatus for inspecting the number of electrode plates in an electrode plate group of a battery.
[0002]
[Prior art]
As a storage battery, a prismatic storage battery is known in which a group of electrode plates formed by laminating a rectangular negative electrode plate and a positive electrode plate with a separator interposed between them is housed in a rectangular battery case together with an electrolytic solution. Such a prismatic storage battery has the advantage that the reaction efficiency of the electrode plate is improved and a large current can be taken out by increasing the electrode area within a limited space.
[0003]
In the manufacturing process of the electrode plate group, a step of inspecting whether or not the negative electrode plate and the positive electrode plate are appropriately laminated is necessary. Therefore, for example, in Japanese Patent Application Laid-Open No. 11-73948, in order to inspect the suitability of the electrode plate group laminated by inserting a separator between positive and negative electrode plates in a lead storage battery, Calculate the number of separators and the pitch between the separators from the image data of the separators that are captured as a bright image between the positive and negative electrode plates that become dark images by irradiating with illumination light, and compare with the standard value An apparatus for determining suitability is disclosed.
[0004]
[Problems to be solved by the invention]
However, one side edge portion of the positive and negative electrode plates protrudes to the opposite side, and the one side edge portion that protrudes is a lead portion having a metallic luster for joining to the current collector. In the case of the plate group, when the inspection method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 11-73948 is applied, when the image is recognized, the one side end face of the electrode plate and the separator in the back are both white images, and white and black The contrast of the image becomes unstable and is not counted properly, and there are problems that a large or small number of misjudgments occur even though the specified number is present.
[0005]
In view of the above-mentioned conventional problems, the present invention properly recognizes the separator and the electrode plate even when the side edge of the electrode plate group and the separator are both white images when the image recognition is performed on one side edge surface of the electrode plate group. An object of the present invention is to provide a battery electrode plate group inspection method and apparatus.
[0006]
[Means for Solving the Problems]
The battery electrode group inspection method for a battery according to the present invention is a battery electrode group inspection method for a battery that inspects an electrode plate group formed by laminating a negative electrode plate and a positive electrode plate with a separator interposed therebetween. One side edge of the plate protrudes from the separator side edge to the opposite side and is laminated, and the identification member is disposed through the one side edge of the electrode plate protruding from the side edge of the separator. The illumination light is irradiated obliquely toward one end face of the electrode plate group to form a dark color portion by shadow on the identification member, and is formed on the identification member along the longitudinal direction of the identification member. By detecting the contrast between the dark color portion and the obvious portion due to the reflected light at one side edge of the electrode plate by image recognition means arranged on the illumination light side with respect to the electrode plate group, the separator and the electrode plate is intended to identify fractionating, the white image of an end face of the electrode plate group when image recognition Even if the side edge of the separator that also forms a white image exists in the back of the one side edge of the plate, each electrode plate is used in a portion where the contrast between the dark portion of the identification member and the one side edge of the electrode plate is large. Therefore, it is possible to appropriately inspect the number of electrode plates.
[0007]
Further, as the discriminating member and Ru using the positioning pin is passed through the positioning hole formed in one end of the electrode plate, there is no need to arrange the separately prepared discriminating member, the irradiation of the illumination light Inspection can be performed easily and efficiently simply by devising the direction.
[0008]
In addition, when the image is recognized with the electrode plate group pressed from above, one end face of each electrode plate can be aligned, and the illumination light reflected on the one end face is specularly reflected by the inclination of the plate face of the electrode plate. It is possible to prevent the fear that the detection cannot be performed properly due to the absence of the detection plate or the detection plate being moved out of the detection region where the contrast is identified.
[0009]
In addition, when a plurality of identification members are arranged and an image is recognized for each identification member, the state of each electrode plate in the electrode plate group can be inspected as a whole, and the electrode plate is positioned on the other end side even if normal on one end side. Even in the case of a defect that is out of alignment, it can be reliably inspected.
[0010]
In addition, a dark color portion is detected by a detection line that crosses the upper end portion of the identification member that is pressed against the electrode plate group from above by a light-colored pressing device arranged corresponding to the identification member. When the detection area is detected and the detection area is set at the position corresponding to the dark color portion, the detection area on the image data can be automatically and appropriately set, and the automatic inspection can be appropriately performed.
[0011]
Further, the battery electrode plate group inspection device of the present invention is a battery electrode plate group inspection device for inspecting an electrode plate group formed by laminating a negative electrode plate and a positive electrode plate with a separator interposed therebetween. A dark-colored portion arranged so that one side end portion of each electrode plate protrudes from the separator side end edge to the opposite side and is disposed so as to penetrate one side end portion of the electrode plate protruding from the separator side edge. An identification member to be formed is disposed, and illumination means for irradiating illumination light obliquely toward one end face of the electrode plate group from an oblique direction to form a dark color portion by a shadow on the identification member, and the electrode plate group The image recognition means is arranged on the illumination light side and recognizes an image of one end face of the electrode plate group along the longitudinal direction of the identification member, and the dark color formed on the identification member recognized by the image recognition means and parts, to detect the contrast between the clear portion by the reflected light at one side edge of the electrode plate , And fractionating the separator and the electrode plate, which has an image processing means for inspecting the plate number, it is possible to properly inspect such number of plates by performing the above inspection method.
[0012]
Also, if you use and the positioning pin is passed through the positioning hole formed in one end of the electrode plate as an identification member can utilize locating pins as discriminating member.
[0013]
Further, when a pressing tool that presses the electrode plate group from above is provided, the image can be recognized in a state in which the electrode plate group is pressed from above and one side end face of each electrode plate is aligned.
[0014]
If a plurality of identification members are arranged and an image recognition means is arranged for each identification member, the state of each electrode plate in the electrode plate group can be inspected as a whole.
[0015]
In addition, a light-colored pressing tool is disposed corresponding to the identification member, and the position of the dark color portion is detected by a detection line that crosses the upper end of the identification member on which the pressing tool is the background. By providing a means for detecting and setting a detection area at a position corresponding to the dark color portion, the detection area can be automatically and appropriately set.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an inspection apparatus for a battery electrode plate group according to the present invention will be described with reference to FIGS.
[0017]
In FIG. 1 and FIG. 2, a plurality of negative plates 2 and positive plates 3 constituting the electrode plate group 1 are stacked with a separator 4 interposed therebetween and set on a conveying jig 5. . The negative electrode plate 2 and the positive electrode plate 3 have one side edge portion projecting to the opposite side to form a lead portion, and a pair of positioning holes are formed in the lead portion. These positioning holes are fitted into the positioning pins 6a, 6b and 7a, 7b which are erected in pairs, and the negative electrode plate 2 and the positive electrode plate 3 are positioned and stacked.
[0018]
In a state where the conveying jig 5 has been conveyed to the inspection position and stopped, pressing rollers 8a and 8b as pressing tools are arranged at positions corresponding to the arrangement positions of the positioning pins 6a, 7a and 6b and 7b. These electrode rollers 8a and 8b are configured to press the electrode plate group 1 from above. Further, both end faces of the pressing rollers 8a and 8b are colored white.
[0019]
An illuminating means 9 is disposed so as to irradiate illumination light obliquely toward the negative electrode side surface from which the lead portion of the negative electrode plate 2 of the electrode plate group 1 protrudes, and the lead of the positive electrode plate 3 of the electrode plate group 1 Illumination means 10 is disposed so as to irradiate illumination light from an oblique direction toward the side surface on the positive electrode side from which the portion protrudes.
[0020]
Image recognition means 11 and 12 are disposed on both sides of the electrode plate group 1 so as to face each other. Each of the image recognition means 11 and 12 includes a pair of recognition cameras 11a, 11b, 12a, and 12b so as to recognize the images of the portions where the positioning pins 6a, 6b, 7a, and 7b are disposed. The image data by these image recognition means 11 and 12 is input to the image processing means 13.
[0021]
As shown in FIGS. 3A and 3B, the illumination means 9 and 10 irradiate illumination light from an oblique direction, so that the positioning pins 6a, 6b, 7a and 7b have illumination means as shown in FIGS. A dark color portion 14 is formed by a shadow on the side opposite to 9, 10 and the contrast increases with the light color portion by the reflected light on the side end surfaces of the negative electrode plate 2 and the positive electrode plate 3. The identification member 15 is constituted by the positioning pins 6a, 6b, 7a, and 7b having the dark color portion.
[0022]
The image processing means 13 identifies the contrast between one edge of the negative electrode plate 2 or the positive electrode plate 3 and the dark color portion 14 and inspects the number of the electrode plates 2 and 3. Therefore, in the image processing means 13, as shown in FIGS. 4 (a) and 4 (b), the pressing rollers 8a and 8b cross the upper ends of the positioning pins 6a, 6b, 7a and 7b. The detection line 16 is set in the detection line 16 and the change in brightness along the detection line 16 is detected to detect the position of the dark color portion 14 in the left-right direction, and the position corresponding to the dark color portion 14 extends along the longitudinal direction of the dark color portion 14. Thus, there is provided means for setting a detection region 17 that covers the entire stacked height of the electrode plate group 1. Then, a change in lightness is detected along the longitudinal direction of the set detection region 17, and a dark and light edge between the light color portion and the dark color portion 14 due to the reflected light on the side end surfaces of the negative electrode plate 2 and the positive electrode plate 3 is detected. Configured to detect numbers.
[0023]
In the above configuration, when the conveying jig 5 on which the electrode plate group 1 is set is conveyed to the inspection position and stopped, it is arranged corresponding to the arrangement positions of the positioning pins 6a, 7a and 6b, 7b. The negative electrode plate 2 and the positive electrode projecting from the side edge of the separator 4 by pressing the electrode plate group 1 from above with the pressing rollers 8 a and 8 b and irradiating illumination light from the oblique direction with the illumination means 9 and 10. A dark-colored portion 14 is formed on the positioning pins 6a, 6b, 7a, and 7b penetrating one side end portion of the plate 3, and illumination light is reflected on one side end surface of the electrode plates 2 and 3 that exhibit metallic luster. The reflected light becomes a bright color, and a stable contrast is obtained as shown in FIGS. 3 (a) and 3 (b).
[0024]
In this state, the image recognition means 11, 12 recognizes an image of the portion where the positioning pins 6 a, 6 b, 7 a, 7 b on one side end face of the electrode plate group 1 are inspected, and the image processing means 13 inspects the number of electrode plates, etc. I do. The inspection process will be described with reference to FIG. 5. First, image data that has been image-recognized is input, and then, as shown in FIGS. 4 (a) and 4 (b), the background of the pressing rollers 8a and 8b is identified. The position of the dark color portion 14 in the left-right direction is detected by a detection line 16 that crosses the upper end portion of the member 15, and the electrode plate group 1 is vertically cut in the stacking direction of the electrode plates 2 and 3 at a position corresponding to the dark color portion 14. The detection area 17 is set. Next, along the longitudinal direction of the detection region 17, the light and dark edges due to the contrast between the light color portion and the dark color portion 14 due to the reflected light at one side edge of the electrode plates 2 and 3 are sequentially detected. Next, it is determined whether or not the number of edges is an appropriate number corresponding to the number of stacked plates 2 and 3, and if it is appropriate, the number determination is OK, and if it is not appropriate, the number determination is performed. NG.
[0025]
According to the present embodiment, the positioning pins 6 a, 6 b, 7 a, 7 b as the identification member 15 that forms the dark color portion 14 as described above are formed on the electrode plates 2, 3 protruding from the side edge of the separator 4. One side end is disposed so as to penetrate, and illumination light is irradiated toward one side end surface of the electrode plate group 1 to recognize an image, and the dark color portion 14 and the electrode plate 2 are arranged along the longitudinal direction of the identification member 15. 3 is identified and the number of electrode plates 2 and 3 is inspected, so that a bright color image Even if the side edge of the separator 4 is present, each of the electrode plates 2 and 3 can be reliably detected, and the number of the electrode plates 2 and 3 can be properly inspected.
[0026]
Further, illumination light from the illumination means 9 and 10 is irradiated from an oblique direction to form a dark color portion 14 at shadow portions formed on the positioning pins 6a, 6b, 7a and 7b, and the positioning pins 6a, 6b, 7a and 7b. Is used as the identification member 15, so that it is not necessary to separately prepare and arrange the identification member 15, and the inspection can be easily and efficiently performed only by devising the irradiation direction of the illumination light. Of course, when the positioning pins 6a, 6b, 7a, and 7b are not used, or when the dark color portion 14 cannot be effectively formed in the shadow portion, it goes without saying that the identification member 15 may be separately arranged. Yes.
[0027]
In addition, since the image recognition is performed in a state where the electrode plate group 1 is pressed from above by the pressing rollers 8a and 8b, the one end surfaces of the electrode plates 2 and 3 can be aligned. It is possible to prevent the illumination light reflected on one side end face from being regularly reflected due to the inclination of the plate surface, or from being separated from the detection region 17 where the contrast is identified due to the rising of the electrode plates 2 and 3. 3 can be made uniform in the reflected light at one side edge, and a stable output can be obtained and detected properly.
[0028]
Also, a pair of positioning pins 6a, 6b, 7a, 7b are arranged on both sides of the negative electrode side and the positive electrode side, respectively, and the images are recognized by the recognition cameras 11a, 11b, 12a, 12b. Even if the electrode plate 2 is normal but the electrode plate 2 or 3 is misaligned on the other end, it can be reliably inspected, and only when the recognition results by all the recognition cameras 11a, 11b, 12a, and 12b are appropriate It is possible to reliably prevent the generation of defective products.
[0029]
Further, the pressing rollers 8a and 8b whose both ends are white are arranged corresponding to the positioning pins 6a, 6b, 7a and 7b functioning as the identification member 15, and the detection lines 16 cross the upper end of the identification member 15. Since the left and right positions of the dark color portion 14 are detected and the detection area 17 is set at a position corresponding to the dark color portion 14, the detection area 17 on the image data can be automatically and appropriately set. Automatic inspection can be performed properly.
[0030]
【The invention's effect】
According to the battery electrode group inspection method and apparatus of the present invention, as is clear from the above description , one end of each electrode plate protrudes from the separator side edge to the opposite side. The identification member is laminated and disposed so as to penetrate one side end of the electrode plate protruding from the side edge of the separator, and the illumination light is obliquely directed toward one side end surface of the electrode plate group. Irradiate to form a dark color portion by shadow on the identification member, and a dark color portion formed on the identification member along the longitudinal direction of the identification member and a clear portion by reflected light at one edge of the electrode plate Is detected by image recognition means arranged on the illumination light side with respect to the electrode plate group, so that the separator and the electrode plate are separated and the number of electrode plates is inspected. Similarly white behind the one side edge of the electrode plate that becomes a white image when one side end surface of the group is recognized. Even if there is a side edge of the separator to be an image, each plate can be detected in a portion where the contrast between the dark portion of the identification member and one side edge of the plate is large. It is possible to properly perform the inspection.
[0031]
Further, as the discriminating member and Ru using the positioning pin is passed through the positioning hole formed in one end of the electrode plate, there is no need to arrange the separately prepared discriminating member, the irradiation of the illumination light Inspection can be performed easily and efficiently simply by devising the direction.
[0032]
In addition, when the image is recognized with the electrode plate group pressed from above, one end face of each electrode plate can be aligned, and the illumination light reflected on the one end face is specularly reflected by the inclination of the plate face of the electrode plate. It is possible to prevent the fear that the detection cannot be performed properly due to the absence of the detection plate or the detection plate being moved out of the detection region where the contrast is identified.
[0033]
In addition, when a plurality of identification members are arranged and an image is recognized for each identification member, the state of each electrode plate in the electrode plate group can be inspected as a whole, and the electrode plate is positioned on the other end side even if it is normal on one end side. Even in the case of a defective defect, it can be reliably inspected.
[0034]
In addition, a dark color portion is detected by a detection line that crosses the upper end portion of the identification member that is pressed against the electrode plate group from above by a light-colored pressing device arranged corresponding to the identification member. If the detection area is detected and the detection area is set at the position corresponding to the dark color portion, the detection area on the image data can be automatically and appropriately set, and the automatic inspection can be appropriately performed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an inspection state in an embodiment of a battery electrode group inspection apparatus for a battery according to the present invention.
FIG. 2 is a perspective view of a state in which the electrode plate group according to the embodiment is set on a conveying jig.
FIGS. 3A and 3B show recognition images in the embodiment, where FIG. 3A is an explanatory diagram of a screen on a negative electrode plate protruding side, and FIG.
4 is an explanatory diagram of a method for performing an inspection by setting an inspection region in the recognized images (a) and (b) of FIG. 3;
FIG. 5 is a flowchart of an inspection process in the same embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electrode plate group 2 Negative electrode plate 3 Positive electrode plate 4 Separator 6a, 6b, 7a, 7b Positioning pin 8a, 8b Pressing roller (pressing tool)
9, 10 Illumination means 11, 12 Image recognition means 11a, 11b, 12a, 12b Recognition camera 13 Image processing means 14 Dark color portion 15 Identification member 16 Detection line 17 Detection region

Claims (10)

負極板と正極板をセパレータを介して積層して成る極板群を検査する電池の極板群検査方法であって、
前記極板群は、各極板の一側端部がセパレータ側端縁からそれぞれ反対側に突出して積層されており、
識別用部材を、セパレータ側端縁より突出している極板の一側端部を貫通させて配置し、
前記極板群の一側端面に向けて、照明光を斜め方向から照射して、前記識別用部材に影による暗色部を形成し、
前記識別用部材の長手方向に沿って、前記識別用部材に形成された暗色部と、前記極板の一側端部での反射光による明白部とのコントラストを、前記極板群に対して前記照明光側に配置した画像認識手段で検出することにより、前記セパレータと極板とを分別して識別することを特徴とする電池の極板群検査方法。A battery electrode plate group inspection method for inspecting an electrode plate group formed by laminating a negative electrode plate and a positive electrode plate via a separator,
The electrode plate group is laminated such that one end of each electrode plate protrudes from the separator side edge to the opposite side .
The identification member is disposed through one side end of the electrode plate protruding from the separator side edge,
To the one side end face of the electrode plate group, irradiate illumination light from an oblique direction, and form a dark color portion by a shadow on the identification member ,
Along the longitudinal direction of the discriminating member, a dark portion formed on the discriminating member, the contrast between the clear portion by the reflected light at one end of the plate, relative to the electrode plate group A method for inspecting a group of electrode plates of a battery , wherein the separator and the electrode plate are separated and identified by detection by an image recognition means arranged on the illumination light side . 識別用部材として、極板の一側端部に形成された位置決め穴に貫通させた位置決めピンを用いることを特徴とする請求項１記載の電池の極板群検査方法。As discriminating member, according to claim 1 electrode plate group inspection method of a battery, wherein the are use a positioning pin is passed through the positioning hole formed in one end of the electrode plate. 極板群を上方から押圧した状態で画像認識することを特徴とする請求項１又は２記載の電池の極板群検査方法。  3. The battery electrode group inspection method for a battery according to claim 1, wherein an image is recognized in a state where the electrode group is pressed from above. 識別用部材を複数配設するとともに各識別用部材ごとに画像認識することを特徴とする請求項１〜３の何れかに記載の電池の極板群検査方法。  The battery electrode plate group inspection method according to claim 1, wherein a plurality of identification members are provided and an image is recognized for each identification member. 識別用部材に対応して配置した明色の押圧具にて極板群を上方から押圧し、押圧具が背景となっている識別用部材の上端部を横断する検出線にて暗色部の位置を検出し、暗色部に対応する位置に検出領域を設定することを特徴とする請求項３又は４記載の電池の極板群検査方法。  The position of the dark color portion is detected by a detection line that presses the electrode plate group from above with a light-colored pressing tool arranged corresponding to the identification member and crosses the upper end of the identification member that is the background of the pressing tool. 5. The battery electrode plate group inspection method according to claim 3, wherein a detection region is set at a position corresponding to a dark color portion. 負極板と正極板をセパレータを介して積層して成る極板群を検査する電池の極板群検査装置であって、
前記極板群は、各極板の一側端部がセパレータ側端縁からそれぞれ反対側に突出して積層され、かつ、セパレータ側端縁より突出している極板の一側端部を貫通して識別用部材が配設されており、
極板群の一側端面に向けて照明光を斜め方向から照射して、前記識別用部材に影による暗色部を形成する照明手段と、
前記極板群に対して前記照明光側に配置し、前記識別用部材の長手方向に沿って極板群の一側端面を画像認識する画像認識手段と、
前記画像認識手段で認識された前記識別用部材に形成された暗色部と、前記極板の一側端部での反射光による明白部とのコントラストを検出することにより、前記セパレータと極板とを分別して、極板枚数を検査する画像処理手段と
を備えたことを特徴とする電池の極板群検査装置。A battery electrode plate group inspection device for inspecting an electrode plate group formed by laminating a negative electrode plate and a positive electrode plate via a separator,
The electrode group is formed by laminating one side end of each electrode plate from the separator side end edge to the opposite side and passing through one side end of the electrode plate protruding from the separator side edge. An identification member is provided ,
Illuminating means for irradiating illumination light toward one side end face of the electrode plate group from an oblique direction, and forming a dark color portion by a shadow on the identification member ;
Image recognition means arranged on the illumination light side with respect to the electrode plate group, and recognizing an image of one end face of the electrode plate group along the longitudinal direction of the identification member ;
A dark portion formed on the discriminating member which has been recognized by the image recognition means, by detecting the contrast between the clear portion by the reflected light at one end of the plate, and the separator and plates And an image processing means for inspecting the number of electrode plates. 極板の一側端部に形成された位置決め穴に貫通させた位置決めピンを識別用部材として兼用したことを特徴とする請求項６記載の電池の極板群検査装置。7. The battery electrode plate group inspection apparatus according to claim 6, wherein a positioning pin penetrated through a positioning hole formed at one end of the electrode plate is also used as an identification member. 極板群を上方から押圧する押圧具を設けたことを特徴とする請求項６又は７記載の電池の極板群検査装置。  The battery electrode plate group inspection apparatus for a battery according to claim 6 or 7, further comprising a pressing tool for pressing the electrode plate group from above. 識別用部材を複数配設するとともに各識別用部材ごとに画像認識手段を配設したことを特徴とする請求項６〜８の何れかに記載の電池の極板群検査装置。  9. The battery electrode group inspection apparatus according to claim 6, wherein a plurality of identification members are provided and an image recognition means is provided for each identification member. 識別用部材に対応して明色の押圧具を配設し、画像処理手段に、押圧具が背景となっている識別用部材の上端部を横断する検出線にて暗色部の位置を検出し、暗色部に対応する位置に検出領域を設定する手段を設けたことを特徴とする請求項８又は９記載の電池の極板群検査装置。  A light-colored pressing tool is provided corresponding to the identification member, and the position of the dark color portion is detected by a detection line that crosses the upper end of the identification member on which the pressing tool is the background. 10. The battery electrode group inspection apparatus according to claim 8, further comprising means for setting a detection region at a position corresponding to the dark color portion.
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