JP4025080B2 - Resistance measuring device and diagnostic device - Google Patents

Resistance measuring device and diagnostic device Download PDF

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JP4025080B2
JP4025080B2 JP2002022730A JP2002022730A JP4025080B2 JP 4025080 B2 JP4025080 B2 JP 4025080B2 JP 2002022730 A JP2002022730 A JP 2002022730A JP 2002022730 A JP2002022730 A JP 2002022730A JP 4025080 B2 JP4025080 B2 JP 4025080B2
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resistance
measurement
fuel cell
signal
voltage
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JP2003223918A (en
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健二 小林
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Hioki EE Corp
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Hioki EE Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば、固体高分子形燃料電池の実効抵抗を四端子法に従って測定するのに適した抵抗測定装置、およびその抵抗測定装置を備えた診断装置に関するものである。
【０００２】
【従来の技術】
一般的に、固体高分子形燃料電池（以下「燃料電池」ともいう）の内部抵抗（インピーダンス）のうちの実効抵抗としては、主として、燃料電池を構成する電解質膜の抵抗、触媒の抵抗、電極等の抵抗およびこれらの接触抵抗（本明細書では、これらを「膜抵抗」と定義する）と、触媒および燃料ガスの反応に起因する反応抵抗とで構成される。この場合、燃料電池の内部抵抗における実効抵抗成分（以下、「実効抵抗」ともいう）については、四端子法に従って、測定用交流信号（以下「測定用信号」ともいう）を燃料電池に印加して測定する。この際に、印加する測定用信号が高い周波数のときには、膜抵抗が実効抵抗として測定され、低い周波数のときには、反応抵抗が実効抵抗として測定される。この測定用信号の周波数をパラメータにした燃料電池の内部抵抗における実効抵抗成分と、虚数成分との関係は、一例として、図２に示すコール・コール・プロットで表される。この場合、「Ｒ１」は、燃料電池が正常な状態のときの膜抵抗を表し、「Ｒ２」は、その状態のときの反応抵抗を表す。一方、燃料電池が、例えば、内部でショートしている状態では、膜抵抗が抵抗値Ｒ１よりも小さな抵抗値を示し、燃料電池が消耗した状態では、膜抵抗が同図に示すように抵抗値Ｒ１よりも大きな抵抗値Ｒ３を示す。また、触媒と燃料ガスとの反応状態が悪い状態では、反応抵抗が同図に示すように抵抗値Ｒ２よりも大きな抵抗値Ｒ４を示す。したがって、膜抵抗および反応抵抗を測定して、各々の測定値を所定の基準値と比較することにより、燃料電池の良否判定が可能となる。
【０００３】
燃料電池の実効抵抗を四端子法に従って測定する抵抗測定装置として、図３に示す抵抗測定装置６１が従来から知られている。この抵抗測定装置６１を使用して測定対象の燃料電池ＢＴの実効抵抗を測定する際には、印加する測定用信号の周波数を変化させて膜抵抗および反応抵抗を測定する。具体的には、同図に示すように、まず、可変負荷６２の抵抗値を燃料電池ＢＴの起電力に応じた抵抗値に設定した後に、可変負荷６２をプローブＰ１，Ｐ２を介して燃料電池ＢＴの両電極に接続する。また、燃料電池ＢＴを流れる測定用信号の電流値を検出する電流検出センサ（カレントトランス）ＣＴをプローブＰ１および可変負荷６２の間に配置し、電流検出センサＣＴと抵抗測定装置６１のセンサ信号入力端子とを接続する。さらに、プローブＰ３，Ｐ５を燃料電池ＢＴの一方の電極に接続すると共にプローブＰ４，Ｐ６を他方の電極に接続する。次いで、測定用信号を所定の周波数（例えば、１ｍＨｚの低周波数）に設定した後に、プローブＰ３，Ｐ４を介して燃料電池ＢＴに印加し、プローブＰ５，Ｐ６を介して、測定用信号が流れることによって燃料電池ＢＴの内部抵抗に発生する交流電圧を入力する。同時に、電流検出センサＣＴの検出電圧を入力する。
【０００４】
この場合、この抵抗測定装置６１では、内部抵抗に発生する交流電圧と、電流検出センサＣＴによって検出された検出電圧とに基づいて燃料電池ＢＴの実効抵抗を算出する。続いて、測定用信号の周波数を所定の周波数刻みで高い周波数に変更し、同様にして燃料電池ＢＴの実効抵抗を算出する。このようにして、測定用信号の周波数を例えば数十ｋＨｚまでの高い周波数に徐々に変更しつつ実効抵抗を算出する。これにより、図３に示すコール・コール・プロットが作成される。この場合、高い周波数の測定用信号で同図に示す膜抵抗（Ｒ１）が求められ、低い周波数の測定用信号で同図に示す反応抵抗（Ｒ２）が求められ、この膜抵抗および反応抵抗の大きさを確認することで燃料電池ＢＴの良否を判定することができる。
【０００５】
【発明が解決しようとする課題】
ところが、従来の抵抗測定装置６１には、以下の問題点がある。すなわち、従来の抵抗測定装置６１では、測定用信号の周波数を徐々に変更して実効抵抗をその都度測定している。この場合、実効抵抗の測定に際しては、測定用信号の少なくとも１サイクルに相当する時間だけ燃料電池ＢＴに印加し続ける必要があるため、低い周波数の測定用信号で測定するときには、その測定に長時間を要することになる。その一方、燃料電池の膜抵抗Ｒ１および反応抵抗Ｒ２を測定するためには、高い周波数および低い周波数の測定用信号を印加して測定する必要がある。したがって、長時間を要する測定を何度も実施することになり、測定作業が煩雑で非効率であるという問題点がある。
【０００６】
本発明は、かかる問題点に鑑みてなされたものであり、燃料電池の実効抵抗を短時間で効率よく測定し得る抵抗測定装置、およびこの抵抗測定装置によって測定された実効抵抗に基づいて燃料電池の良否を効率よく診断し得る診断装置を提供することを主目的とする。
【０００７】
【課題を解決するための手段】
上記目的を達成すべく請求項１記載の抵抗測定装置は、燃料電池の実効抵抗を測定する測定装置であって、前記実効抵抗の一部を形成する膜抵抗を測定するための第１測定用交流信号と当該実効抵抗の一部を形成する反応抵抗を測定するための第２測定用交流信号とをミキシングして測定用信号を生成する測定用信号生成部と、測定部とを備え、前記測定 部は、前記測定用信号を前記燃料電池に印加した状態において前記燃料電池を流れる前記測定用信号の電流値に応じた電圧を入力したときに前記膜抵抗を流れる前記第１測定用交流信号の電流値に応じた電圧を出力する第１バンドパスフィルタと、前記燃料電池の両電極間に発生する電圧と前記第１測定用交流信号の電流値に応じた電圧とで同期検波して前記膜抵抗に発生する電圧を検出する第１同期整流回路と、当該第１同期整流回路によって検出された電圧を前記第１測定用交流信号の電流値に応じた電圧で除算することによって前記膜抵抗の抵抗値を求める第１除算器と、前記測定用信号を前記燃料電池に印加した状態において前記燃料電池を流れる前記測定用信号の電流値に応じた電圧を入力して前記反応抵抗を流れる前記第２測定用交流信号の電流値に応じた電圧を出力する第２バンドパスフィルタと、前記燃料電池の前記両電極間に発生する電圧と前記第２測定用交流信号の電流値に応じた電圧とで同期検波して前記反応抵抗に発生する電圧を検出する第２同期整流回路と、当該第２同期整流回路によって検出された電圧を前記第２測定用交流信号の電流値に応じた電圧で除算することによって前記反応抵抗の抵抗値を求める第２除算器とを備えて構成されている。
【０００８】
請求項２記載の診断装置は、燃料電池の良否を診断する診断装置であって、請求項１記載の抵抗測定装置と、前記膜抵抗の抵抗値が所定範囲内か否かを判定すると共に前記反応抵抗の抵抗値が所定の上限値以下か否かを判定する判定部とを備えている。
【０００９】
請求項３記載の診断装置は、請求項２記載の診断装置において、前記判定部は、前記膜抵抗の抵抗値が前記所定範囲を外れているとき、または前記反応抵抗の抵抗値が前記所定の上限値を超えているときに、診断対象の前記燃料電池を不良と判定する。
【００１０】
請求項４記載の診断装置は、請求項２または３記載の診断装置において、前記判定部の判定結果を表示する表示部を備えている。
【００１１】
【発明の実施の形態】
以下、添付図面を参照して、本発明に係る抵抗測定装置および診断装置の好適な実施の形態について説明する。なお、図３に示す構成と同一の構成要素については、同一の符号を付して重複する説明を省略する。
【００１２】
最初に、診断装置１の構成について、図１を参照して説明する。
【００１３】
診断装置１は、測定対象の燃料電池の実効抵抗を測定してその測定値に基づいて燃料電池の良否を診断する診断装置であって、図１に示すように、信号生成部１１、測定部１２、判定部１３および表示部１４を備えて構成されている。信号生成部１１は、発振器２１，２２、アンプ２３および抵抗２４〜２６を備えている。この場合、発振器２１は、測定対象である燃料電池ＢＴの膜抵抗を測定し得る周波数（例えば１０ｋＨｚ）の第１測定用交流信号を生成し、発振器２２は、燃料電池ＢＴの反応抵抗を測定し得る周波数（第１測定用交流信号の周波数よりも低い周波数：例えば１０Ｈｚ）の第２測定用交流信号を生成する。また、アンプ２３および抵抗２４〜２６は、発振器２１，２２によって生成された第１測定用交流信号および第２測定用交流信号をミキシングして測定用信号を生成する。
【００１４】
測定部１２は、バンドパスフィルタ３１，４１、同期検波回路３２，４２、ローパスフィルタ３３，４３、除算器３４，４４およびコンパレータ３５，４５を備えて構成されている。この場合、バンドパスフィルタ３１、同期検波回路３２、ローパスフィルタ３３および除算器３４が膜抵抗を測定する。具体的には、バンドパスフィルタ３１は、本発明における第１バンドパスフィルタに相当し、電流検出センサＣＴから出力されるセンサ信号を入力した際に、第１測定用交流信号の電流値に応じた電圧Ｖ２を出力する。同期検波回路３２は、本発明における第１同期整流回路に相当し、測定用信号が流れることによって燃料電池ＢＴの内部抵抗に発生する電圧Ｖ１と電圧Ｖ２とで同期検波することによって、等価的に膜抵抗の両端に発生する電圧に対応する電圧を含む電圧Ｖ３を生成する。この場合、バンドパスフィルタ３１に電圧Ｖ１を入力して、同期検波回路３２に電圧Ｖ１に代えて電流検出センサＣＴから出力されるセンサ信号を入力してもよい（後述する反応抵抗の測定回路においても同様）。ローパスフィルタ３３は、抵抗３６およびコンデンサ３７と相俟って電圧Ｖ３から高周波成分を除去して膜抵抗の両端に発生する電圧に対応する直流の電圧Ｖ４のみを出力する。除算器３４は、電圧Ｖ４を電圧Ｖ２で除算することによって膜抵抗の実効抵抗値に比例する電圧値の電圧Ｖ５を出力する。
【００１５】
一方、バンドパスフィルタ４１、同期検波回路４２、ローパスフィルタ４３および除算器４４は反応抵抗を測定する。具体的には、バンドパスフィルタ４１は、本発明における第２バンドパスフィルタに相当し、電流検出センサＣＴから出力されるセンサ信号を入力した際に、第２測定用信号の電流値に応じた電圧Ｖ１２を出力する。同期検波回路４２は、本発明における第２同期整流回路に相当し、測定用信号が流れることによって燃料電池ＢＴの内部抵抗に発生する電圧Ｖ１と電圧Ｖ１２とで同期検波することによって、等価的に反応抵抗の両端に発生する電圧に対応する電圧を含む電圧Ｖ１３を生成する。ローパスフィルタ４３は、抵抗４６およびコンデンサ４７と相俟って電圧Ｖ１３から高周波部分を除去して反応抵抗の両端に発生する電圧に対応する直流の電圧Ｖ１４のみを出力する。除算器４４は、電圧Ｖ１４を電圧Ｖ１２で除算することによって反応抵抗の実効抵抗値に比例する電圧Ｖ１５を出力する。
【００１６】
コンパレータ３５は、下限判定用電源３８から出力される下限電圧Ｖ６および上限判定用電源３９から出力される上限電圧Ｖ７と電圧Ｖ５とを比較して、電圧Ｖ５が下限電圧Ｖ６から上限電圧Ｖ７までの電圧範囲（所定範囲）から外れたときに検出信号を出力する。この場合、下限電圧Ｖ６は、内部でショートしていない状態の良品の燃料電池ＢＴにおける膜抵抗の最小実効抵抗値（図２に示す抵抗値Ｒ１の例えば７０％の値とする）に相当する電圧に対応し、上限電圧Ｖ７は、良品の燃料電池ＢＴの膜抵抗として許容できる最大実効抵抗値（図２に示す抵抗値Ｒ１の例えば１３０％の値とする）に相当する電圧に対応する。また、コンパレータ４５は、上限判定用電源４８から出力される上限電圧Ｖ１６と電圧Ｖ１５とを比較して、電圧Ｖ１５が上限電圧Ｖ１６を超えているときに検出信号を出力する。この場合、上限電圧Ｖ１６は、良品の燃料電池ＢＴの反応抵抗として許容できる最大実効抵抗値（図２に示す抵抗値Ｒ２の例えば１３０％とする）に相当する電圧に対応する。したがって、このコンパレータ３５，４５の検出信号を監視することで、膜抵抗の実効抵抗値が抵抗値Ｒ１に対して±３０％の範囲内に収まり、かつ反応抵抗の実効抵抗値が抵抗値Ｒ２に対して＋１３０％以下の範囲内に収まっているときに、内部ショートが発生することなく、反応状態が正常の燃料電池ＢＴと判別することが可能となる。なお、反応抵抗の実効抵抗値の下限値については、コンパレータ３５の検出信号に基づいて内部ショートを判別できるため、その設定が不要である。
【００１７】
判定部１３は、コンパレータ３５，４５によって出力される検出信号に基づいて燃料電池ＢＴの良否を判定し、その判定結果を図外の外部装置に出力すると共に表示部１４に表示させる。具体的には、判定部１３は、外部装置に対して、例えば、コンパレータ３５，４５の少なくとも一方から検出信号が出力されたときにＮＧ信号を出力し、いずれからも検出信号が入力されないときはＯＫ信号を出力する。また、判定部１３は、電圧Ｖ５，Ｖ１５の電圧値を燃料電池ＢＴの膜抵抗および反応抵抗の各実効抵抗値に変換演算した後に、表示部１４に対して各実効抵抗値を表示させると共に、ＯＫ信号を出力するときには「良品」を示す旨を表示させ、ＮＧ信号を出力するときには「不良品」を示す旨を表示させる。表示部１４は、判定部１３によって出力される表示データに基づいて、燃料電池ＢＴの膜抵抗および反応抵抗の各実効抵抗値を表示すると共に良否も表示する。
【００１８】
次に、この診断装置１による燃料電池ＢＴの実効電圧の測定方法および良否診断動作について、図１を参照して説明する。
【００１９】
測定に先立ち、図１に示すように、まず、燃料電池ＢＴの起電力に応じた所定抵抗値の負荷２をプローブＰ１，Ｐ２を介して燃料電池ＢＴの両電極に接続する。次いで、燃料電池ＢＴに流れる電流を検出する電流検出センサＣＴを燃料電池ＢＴの正極側に接続したプローブＰ１を取り囲むようにして配置し、その電流検出センサＣＴと、診断装置１のセンサ信号入力端子とを接続する。
【００２０】
また、プローブＰ３をプローブＰ１（または燃料電池ＢＴの正極電極）に接続し、プローブＰ４を燃料電池ＢＴの負極電極に接続する。さらに、プローブＰ５を燃料電池ＢＴの正極電極に接続すると共にプローブＰ６を燃料電池ＢＴの負極電極に接続する。これにより、燃料電池ＢＴに測定用信号が印加されて、燃料電池ＢＴを流れる測定用信号の電流値に応じた電圧に相当するセンサ信号が電流検出センサＣＴから診断装置１のセンサ信号入力端子に出力されると共に、プローブＰ５を介して燃料電池ＢＴの両電極間に発生する電圧Ｖ１が診断装置１のセンスＨ端子（測定部１２の入力部）に出力される。
【００２１】
電流検出センサＣＴから出力されたセンサ信号は、センサ信号入力端子を介して測定部１２に入力され、２分配されてバンドパスフィルタ３１，４１にそれぞれ入力される。この際に、バンドパスフィルタ３１は、入力したセンサ信号から第１測定用交流信号の電流値に比例する（応じた）電圧Ｖ２を抽出して同期検波回路３２に出力する。次いで、同期検波回路３２は、電圧Ｖ２と電圧Ｖ１とで同期検波して電圧Ｖ３を生成して出力し、続いて、ローパスフィルタ３３がその電圧Ｖ３に含まれている高周波成分を除去して、膜抵抗の実効抵抗に発生する電圧に比例する電圧Ｖ４を出力する。次いで、除算器３４が、電圧Ｖ４を電圧Ｖ２で除算することによって膜抵抗の実効抵抗値に比例する電圧Ｖ５をコンパレータ３５および判定部１３に出力する。一方、バンドパスフィルタ４１は、入力したセンサ信号から第２測定用交流信号の電流値に比例する（応じた）電圧Ｖ１２を抽出して同期検波回路４２に出力する。次いで、同期検波回路４２は、電圧Ｖ１２と電圧Ｖ１とで同期検波して電圧Ｖ１３を生成して出力し、続いて、ローパスフィルタ４３がその電圧Ｖ１３に含まれている高周波部分を除去して、反応抵抗の実効抵抗に発生する電圧に比例する電圧Ｖ１４を出力する。次いで、除算器４４が、電圧Ｖ１４を電圧Ｖ１２で除算することによって反応抵抗の実効抵抗値に比例する電圧Ｖ１５をコンパレータ４５および判定部１３に出力する。これにより、膜抵抗および反応抵抗の各実効抵抗値が同時に測定される。
【００２２】
続いて、コンパレータ３５が、電圧Ｖ５と、下限判定用電源３８から入力した下限電圧Ｖ６および上限判定用電源３９から入力した上限電圧Ｖ７とを比較して、電圧Ｖ５が両電圧の範囲から外れたときに、検出信号を出力する。一方、コンパレータ４５は、電圧Ｖ１５と、上限判定用電源４８から入力した上限電圧Ｖ１６とを比較して、電圧Ｖ１５が上限電圧Ｖ１６を超えるときに、検出信号を出力する。続いて、判定部１３がコンパレータ３５，４５からそれぞれ出力される検出信号に基づいて燃料電池ＢＴの良否を判定する。この場合、判定部１３は、除算器３４，４４から電圧Ｖ５，Ｖ１５がそれぞれ出力された後に所定時間待機し、コンパレータ３５，４５の少なくとも一方から検出信号が出力されたときには、燃料電池ＢＴを不良と判断してＮＧ信号を出力し、いずれからも検出信号が出力されていないときには、正常と判断してＯＫ信号を出力する。これにより、膜抵抗および反応抵抗のそれぞれの測定結果に基づいて、燃料電池ＢＴの良否が診断される。また、判定部１３は、除算器３４から出力された電圧Ｖ５および除算器４４から出力された電圧Ｖ１５をそれぞれ数値化すると共にその各数値（測定値）と燃料電池ＢＴの良否判定結果とを表示部１４に表示させる。これにより、測定者に対して、燃料電池ＢＴの膜抵抗および反応抵抗の各測定値と、診断結果とが報知される。
【００２３】
このように、この診断装置１によれば、燃料電池ＢＴの膜抵抗および反応抵抗の各実効抵抗値をそれぞれ測定するための第１測定用信号および第２測定用信号をミキシングした測定用信号を生成する信号生成部１１と、膜抵抗および反応抵抗の各実効抵抗値をそれぞれ測定する測定部１２とを備えて構成したことにより、膜抵抗および反応抵抗の各実効抵抗値を同時に測定することができる。したがって、測定に要する時間を短縮することができるため、燃料電池ＢＴの実効抵抗を効率的に測定することができる。また、判定部１３を備えたことにより、燃料電池の良否を自動診断させることができる。さらに、表示部１４を備えたことにより、測定者が判定結果を視覚的に確実に認識することができると共に、測定値を容易に確認することができる。
【００２４】
なお、本発明は、上述した本発明の実施の形態に限定されない。例えば、上記した診断装置１では、固定周波数の信号を生成する発振器２１，２２を備えて信号生成部１１を構成した例について説明したが、周波数を任意に設定可能なＤＤＳやＰＬＬ回路を備えて信号生成部を構成することもできる。また、診断装置１を測定対象の燃料電池に組み込むこともできる。この場合、例えば、測定開始時間を計測するタイマを備えることにより、定期的かつ自動的に燃料電池ＢＴの自己診断を行うこともできる。また、測定値を記録する記録装置を備えることにより、測定値の推移の把握やこれによる燃料電池の寿命の予測を行うこともできる。
【００２５】
【発明の効果】
以上のように、請求項１記載の抵抗測定装置によれば、膜抵抗を測定するための第１測定用交流信号と反応抵抗を測定するための第２測定用交流信号とをミキシングして測定用信号を生成する測定用信号生成部と、膜抵抗を流れる第１測定用交流信号の電流値および膜抵抗に発生する電圧に基づいて膜抵抗の抵抗値を求めると共に反応抵抗を流れる第２測定用交流信号の電流値および反応抵抗に発生する電圧に基づいて反応抵抗の抵抗値を求める測定部とを備えたことにより、膜抵抗および反応抵抗の各実効抵抗値を同時に測定することができるため、短時間で燃料電池の実効抵抗値を効率よく測定することができる。
【００２６】
また、この抵抗測定装置によれば、第１バンドパスフィルタ、第２バンドパスフィルタ、第１同期整流回路、第２同期整流回路、第１除算器および第２除算器を備えて測定部を構成したことにより、膜抵抗および反応抵抗の各実効抵抗値を同時にしかも正確に測定することができる。
【００２７】
また、請求項２，３記載の診断装置によれば、抵抗測定装置と、膜抵抗の実効抵抗値が所定範囲内か否かを判定すると共に反応抵抗の実効抵抗値が所定の上限値以下か否かを判定する判定部とを備えたことにより、燃料電池の良否を効率よく、しかも自動診断させることができる。
【００２８】
また、請求項４記載の測定装置によれば、判定部の判定結果を表示する表示部を備えたことにより、測定者に対して燃料電池の良否を確実に報知することができる。
【図面の簡単な説明】
【図１】 本発明の実施の形態に係る診断装置１および燃料電池ＢＴの構成を示す回路図である。
【図２】 一般的な燃料電池の内部抵抗を表すコール・コール・プロット図であって、実線は良品の燃料電池ＢＴにおけるコール・コール・プロット図を示し、破線は不良品の燃料電池ＢＴにおけるコール・コール・プロット図を示す。
【図３】 従来の抵抗測定装置６１および燃料電池ＢＴの構成を示す回路図である。
【符号の説明】
１ 診断装置
２ 負荷
１１ 信号生成部
１２ 測定部
１３ 判定部
１４ 表示部
２１，２２ 発振器
３１，４１ バンドパスフィルタ
３２，４２ 同期検波回路
３４，４４ 除算器
３５，４５ コンパレータ
３８ 下限判定用電源
３９，４８ 上限判定用電源
ＢＴ 燃料電池ＢＴ
ＣＴ 電流検出センサ
Ｒ１，Ｒ３ 膜抵抗
Ｒ２，Ｒ４ 反応抵抗[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resistance measuring apparatus suitable for measuring, for example, the effective resistance of a polymer electrolyte fuel cell according to a four-terminal method, and a diagnostic apparatus including the resistance measuring apparatus.
[0002]
[Prior art]
In general, the effective resistance of the internal resistance (impedance) of a polymer electrolyte fuel cell (hereinafter also referred to as “fuel cell”) mainly includes the resistance of an electrolyte membrane, the resistance of a catalyst, and the electrode constituting the fuel cell. And these contact resistances (in this specification, these are defined as “membrane resistances”) and reaction resistance resulting from the reaction between the catalyst and the fuel gas. In this case, for the effective resistance component (hereinafter also referred to as “effective resistance”) of the internal resistance of the fuel cell, a measurement AC signal (hereinafter also referred to as “measurement signal”) is applied to the fuel cell according to the four-terminal method. To measure. At this time, when the applied measurement signal has a high frequency, the membrane resistance is measured as an effective resistance, and when the measurement signal has a low frequency, the reaction resistance is measured as an effective resistance. The relationship between the effective resistance component and the imaginary component of the internal resistance of the fuel cell using the frequency of the measurement signal as a parameter is represented by a Cole-Cole plot shown in FIG. 2 as an example. In this case, “R1” represents the membrane resistance when the fuel cell is in a normal state, and “R2” represents the reaction resistance in that state. On the other hand, when the fuel cell is short-circuited inside, for example, the membrane resistance exhibits a resistance value smaller than the resistance value R1, and when the fuel cell is consumed, the membrane resistance has a resistance value as shown in FIG. The resistance value R3 is larger than R1. Further, when the reaction state between the catalyst and the fuel gas is poor, the reaction resistance shows a resistance value R4 larger than the resistance value R2 as shown in FIG. Therefore, it is possible to determine the quality of the fuel cell by measuring the membrane resistance and the reaction resistance and comparing each measured value with a predetermined reference value.
[0003]
A resistance measuring device 61 shown in FIG. 3 is conventionally known as a resistance measuring device that measures the effective resistance of a fuel cell according to a four-terminal method. When measuring the effective resistance of the fuel cell BT to be measured using this resistance measuring device 61, the membrane resistance and the reaction resistance are measured by changing the frequency of the applied measurement signal. Specifically, as shown in the figure, first, after setting the resistance value of the variable load 62 to a resistance value corresponding to the electromotive force of the fuel cell BT, the variable load 62 is connected to the fuel cell via the probes P1 and P2. Connect to both electrodes of BT. In addition, a current detection sensor (current transformer) CT for detecting the current value of the measurement signal flowing through the fuel cell BT is disposed between the probe P1 and the variable load 62, and sensor signal inputs of the current detection sensor CT and the resistance measurement device 61 are input. Connect the terminal. Further, the probes P3 and P5 are connected to one electrode of the fuel cell BT, and the probes P4 and P6 are connected to the other electrode. Next, after setting the measurement signal to a predetermined frequency (for example, a low frequency of 1 mHz), the measurement signal is applied to the fuel cell BT through the probes P3 and P4, and the measurement signal flows through the probes P5 and P6. The AC voltage generated at the internal resistance of the fuel cell BT is input by. At the same time, the detection voltage of the current detection sensor CT is input.
[0004]
In this case, the resistance measuring device 61 calculates the effective resistance of the fuel cell BT based on the AC voltage generated in the internal resistance and the detected voltage detected by the current detection sensor CT. Subsequently, the frequency of the measurement signal is changed to a high frequency in predetermined frequency increments, and the effective resistance of the fuel cell BT is calculated in the same manner. In this way, the effective resistance is calculated while gradually changing the frequency of the measurement signal to a high frequency up to several tens of kHz, for example. As a result, the Cole-Cole plot shown in FIG. 3 is created. In this case, the membrane resistance (R1) shown in the figure is obtained with the high frequency measurement signal, and the reaction resistance (R2) shown in the figure is obtained with the low frequency measurement signal. The quality of the fuel cell BT can be determined by checking the size.
[0005]
[Problems to be solved by the invention]
However, the conventional resistance measuring device 61 has the following problems. That is, in the conventional resistance measuring device 61, the effective resistance is measured each time by gradually changing the frequency of the measurement signal. In this case, when measuring the effective resistance, it is necessary to continue to apply to the fuel cell BT for a time corresponding to at least one cycle of the measurement signal. Therefore, when measuring with a low frequency measurement signal, the measurement takes a long time. Will be required. On the other hand, in order to measure the membrane resistance R1 and reaction resistance R2 of the fuel cell, it is necessary to apply and measure measurement signals having high and low frequencies. Therefore, the measurement which requires a long time is performed many times, and there is a problem that the measurement work is complicated and inefficient.
[0006]
The present invention has been made in view of such problems, and a resistance measuring device capable of efficiently measuring the effective resistance of a fuel cell in a short time, and a fuel cell based on the effective resistance measured by the resistance measuring device. The main object of the present invention is to provide a diagnostic apparatus capable of efficiently diagnosing quality.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the resistance measuring apparatus according to claim 1 is a measuring apparatus for measuring an effective resistance of a fuel cell, and is for a first measurement for measuring a membrane resistance forming a part of the effective resistance. comprising a measurement signal generator that generates a measurement signal and mixes the second measuring AC signals for measuring the reaction resistance which forms part of the AC signal and the effective resistance, and a measurement tough, The measuring unit receives the voltage corresponding to the current value of the measurement signal flowing through the fuel cell in a state where the measurement signal is applied to the fuel cell, and the first AC for measurement flows through the membrane resistance. A first band-pass filter that outputs a voltage corresponding to the current value of the signal, and a synchronous detection using a voltage generated between both electrodes of the fuel cell and a voltage corresponding to the current value of the first AC signal for measurement. Detects voltage generated in the membrane resistance A first synchronous rectifier circuit, and a first division for determining a resistance value of the film resistance by dividing a voltage detected by the first synchronous rectifier circuit by a voltage corresponding to a current value of the first AC signal for measurement. Current of the second AC signal for measurement flowing through the reaction resistor by inputting a voltage corresponding to the current value of the signal for measurement flowing through the fuel cell with the measurement signal applied to the fuel cell A second bandpass filter that outputs a voltage corresponding to the value; a voltage generated between the electrodes of the fuel cell; and a voltage corresponding to the current value of the second AC signal for measurement to detect the reaction A second synchronous rectifier circuit that detects a voltage generated in the resistor, and a voltage detected by the second synchronous rectifier circuit is divided by a voltage corresponding to a current value of the second AC signal for measurement. resistance It is configured to include a second divider for obtaining a.
[0008]
Diagnostic device according to claim 2, there is provided a diagnostic apparatus for diagnosing the quality of the fuel cell, a resistance measuring device of claim 1 Symbol placement, the resistance value of the film resistance is determined whether within a predetermined range A determination unit that determines whether or not the resistance value of the reaction resistance is equal to or lower than a predetermined upper limit value.
[0009]
According to a third aspect of the present invention, in the diagnostic device according to the second aspect , the determination unit is configured such that the resistance value of the membrane resistance is out of the predetermined range or the resistance value of the reaction resistance is the predetermined value. When the upper limit is exceeded, the fuel cell to be diagnosed is determined to be defective.
[0010]
According to a fourth aspect of the present invention, the diagnostic apparatus according to the second or third aspect further includes a display unit that displays a determination result of the determination unit.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a resistance measuring device and a diagnostic device according to the invention will be described with reference to the accompanying drawings. In addition, about the component same as the structure shown in FIG. 3, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.
[0012]
First, the configuration of the diagnostic apparatus 1 will be described with reference to FIG.
[0013]
The diagnostic device 1 is a diagnostic device that measures the effective resistance of the fuel cell to be measured and diagnoses the quality of the fuel cell based on the measured value. As shown in FIG. 12, the determination part 13 and the display part 14 are provided. The signal generation unit 11 includes oscillators 21 and 22, an amplifier 23, and resistors 24 to 26. In this case, the oscillator 21 generates a first measurement AC signal having a frequency (for example, 10 kHz) that can measure the membrane resistance of the fuel cell BT to be measured, and the oscillator 22 measures the reaction resistance of the fuel cell BT. A second measurement AC signal having a frequency to be obtained (frequency lower than the frequency of the first measurement AC signal: for example, 10 Hz) is generated. The amplifier 23 and the resistors 24 to 26 generate a measurement signal by mixing the first measurement AC signal and the second measurement AC signal generated by the oscillators 21 and 22.
[0014]
The measurement unit 12 includes band pass filters 31 and 41, synchronous detection circuits 32 and 42, low pass filters 33 and 43, dividers 34 and 44, and comparators 35 and 45. In this case, the band pass filter 31, the synchronous detection circuit 32, the low pass filter 33, and the divider 34 measure the membrane resistance. Specifically, the band-pass filter 31 corresponds to the first band-pass filter in the present invention, and corresponds to the current value of the first AC signal for measurement when the sensor signal output from the current detection sensor CT is input. Voltage V2 is output. The synchronous detection circuit 32 corresponds to the first synchronous rectifier circuit in the present invention, and is equivalently detected by performing synchronous detection with the voltage V1 and the voltage V2 generated in the internal resistance of the fuel cell BT when the measurement signal flows. A voltage V3 including a voltage corresponding to the voltage generated at both ends of the membrane resistance is generated. In this case, the voltage V1 may be input to the bandpass filter 31, and a sensor signal output from the current detection sensor CT may be input to the synchronous detection circuit 32 instead of the voltage V1 (in a reaction resistance measurement circuit described later). The same). The low-pass filter 33 removes a high frequency component from the voltage V3 in combination with the resistor 36 and the capacitor 37, and outputs only the DC voltage V4 corresponding to the voltage generated at both ends of the film resistance. The divider 34 outputs a voltage V5 having a voltage value proportional to the effective resistance value of the membrane resistance by dividing the voltage V4 by the voltage V2.
[0015]
On the other hand, the band-pass filter 41, the synchronous detection circuit 42, the low-pass filter 43, and the divider 44 measure reaction resistance. Specifically, the band-pass filter 41 corresponds to the second band-pass filter in the present invention, and corresponds to the current value of the second measurement signal when the sensor signal output from the current detection sensor CT is input. The voltage V12 is output. The synchronous detection circuit 42 corresponds to the second synchronous rectifier circuit in the present invention, and is equivalently detected by synchronous detection with the voltage V1 and the voltage V12 generated in the internal resistance of the fuel cell BT when the measurement signal flows. A voltage V13 including a voltage corresponding to the voltage generated at both ends of the reaction resistance is generated. The low-pass filter 43, combined with the resistor 46 and the capacitor 47, removes a high-frequency portion from the voltage V13 and outputs only a DC voltage V14 corresponding to the voltage generated at both ends of the reaction resistor. The divider 44 outputs a voltage V15 proportional to the effective resistance value of the reaction resistance by dividing the voltage V14 by the voltage V12.
[0016]
The comparator 35 compares the lower limit voltage V6 output from the lower limit determination power supply 38 and the upper limit voltage V7 output from the upper limit determination power supply 39 with the voltage V5, and the voltage V5 is from the lower limit voltage V6 to the upper limit voltage V7. A detection signal is output when the voltage falls outside the voltage range (predetermined range). In this case, the lower limit voltage V6 is a voltage corresponding to the minimum effective resistance value (for example, 70% of the resistance value R1 shown in FIG. 2) of a good fuel cell BT that is not short-circuited inside. The upper limit voltage V7 corresponds to a voltage corresponding to the maximum effective resistance value (for example, a value of 130% of the resistance value R1 shown in FIG. 2) allowable as the membrane resistance of the non-defective fuel cell BT. The comparator 45 compares the upper limit voltage V16 output from the upper limit determination power supply 48 with the voltage V15, and outputs a detection signal when the voltage V15 exceeds the upper limit voltage V16. In this case, the upper limit voltage V16 corresponds to a voltage corresponding to a maximum effective resistance value (for example, 130% of the resistance value R2 shown in FIG. 2) that can be accepted as a reaction resistance of a good fuel cell BT. Therefore, by monitoring the detection signals of the comparators 35 and 45, the effective resistance value of the membrane resistance falls within ± 30% of the resistance value R1, and the effective resistance value of the reaction resistance becomes the resistance value R2. On the other hand, when it is within the range of + 130% or less, it becomes possible to distinguish the fuel cell BT from the normal reaction state without causing an internal short circuit. The lower limit value of the effective resistance value of the reaction resistance need not be set because an internal short circuit can be determined based on the detection signal of the comparator 35.
[0017]
The determination unit 13 determines the quality of the fuel cell BT based on the detection signals output by the comparators 35 and 45, and outputs the determination result to an external device (not shown) and causes the display unit 14 to display the determination result. Specifically, the determination unit 13 outputs an NG signal to an external device when, for example, a detection signal is output from at least one of the comparators 35 and 45, and when no detection signal is input from either of them. An OK signal is output. The determination unit 13 converts the voltage values of the voltages V5 and V15 into the effective resistance values of the membrane resistance and reaction resistance of the fuel cell BT, and then displays the effective resistance values on the display unit 14, When an OK signal is output, a message indicating “non-defective product” is displayed, and when an NG signal is output, a message indicating “defective product” is displayed. The display unit 14 displays the effective resistance values of the membrane resistance and the reaction resistance of the fuel cell BT based on the display data output by the determination unit 13 and also the quality.
[0018]
Next, a method for measuring the effective voltage of the fuel cell BT and the pass / fail diagnosis operation by the diagnostic device 1 will be described with reference to FIG.
[0019]
Prior to the measurement, as shown in FIG. 1, first, a load 2 having a predetermined resistance value corresponding to the electromotive force of the fuel cell BT is connected to both electrodes of the fuel cell BT via the probes P1 and P2. Next, a current detection sensor CT for detecting a current flowing through the fuel cell BT is disposed so as to surround the probe P1 connected to the positive electrode side of the fuel cell BT, and the current detection sensor CT and the sensor signal input terminal of the diagnostic device 1 And connect.
[0020]
Further, the probe P3 is connected to the probe P1 (or the positive electrode of the fuel cell BT), and the probe P4 is connected to the negative electrode of the fuel cell BT. Further, the probe P5 is connected to the positive electrode of the fuel cell BT, and the probe P6 is connected to the negative electrode of the fuel cell BT. As a result, a measurement signal is applied to the fuel cell BT, and a sensor signal corresponding to a voltage corresponding to the current value of the measurement signal flowing through the fuel cell BT is transferred from the current detection sensor CT to the sensor signal input terminal of the diagnostic device 1. At the same time, a voltage V1 generated between both electrodes of the fuel cell BT via the probe P5 is output to the sense H terminal of the diagnostic apparatus 1 (input unit of the measuring unit 12).
[0021]
The sensor signal output from the current detection sensor CT is input to the measurement unit 12 via the sensor signal input terminal, divided into two, and input to the bandpass filters 31 and 41, respectively. At this time, the bandpass filter 31 extracts a voltage V2 proportional to (corresponding to) the current value of the first measurement AC signal from the input sensor signal and outputs the voltage V2 to the synchronous detection circuit 32. Next, the synchronous detection circuit 32 generates and outputs the voltage V3 by performing synchronous detection with the voltage V2 and the voltage V1, and then the low-pass filter 33 removes the high frequency component included in the voltage V3, A voltage V4 proportional to the voltage generated in the effective resistance of the membrane resistance is output. Next, the divider 34 divides the voltage V4 by the voltage V2 to output a voltage V5 proportional to the effective resistance value of the membrane resistance to the comparator 35 and the determination unit 13. On the other hand, the band-pass filter 41 extracts a voltage V12 proportional to (corresponding to) the current value of the second measurement AC signal from the input sensor signal and outputs the voltage V12 to the synchronous detection circuit 42. Subsequently, the synchronous detection circuit 42 generates and outputs a voltage V13 by performing synchronous detection with the voltage V12 and the voltage V1, and subsequently, the low-pass filter 43 removes a high frequency portion included in the voltage V13, A voltage V14 proportional to the voltage generated at the effective resistance of the reaction resistance is output. Next, the divider 44 divides the voltage V14 by the voltage V12 to output a voltage V15 proportional to the effective resistance value of the reaction resistance to the comparator 45 and the determination unit 13. Thereby, each effective resistance value of membrane resistance and reaction resistance is measured simultaneously.
[0022]
Subsequently, the comparator 35 compares the voltage V5 with the lower limit voltage V6 input from the lower limit determination power supply 38 and the upper limit voltage V7 input from the upper limit determination power supply 39, and the voltage V5 deviates from the range of both voltages. Sometimes a detection signal is output. On the other hand, the comparator 45 compares the voltage V15 with the upper limit voltage V16 input from the upper limit determination power supply 48, and outputs a detection signal when the voltage V15 exceeds the upper limit voltage V16. Subsequently, the determination unit 13 determines the quality of the fuel cell BT based on the detection signals output from the comparators 35 and 45, respectively. In this case, the determination unit 13 waits for a predetermined time after the voltages V5 and V15 are output from the dividers 34 and 44, respectively, and when the detection signal is output from at least one of the comparators 35 and 45, the fuel cell BT is defective. NG signal is output, and if no detection signal is output from any of them, it is determined normal and an OK signal is output. Thereby, the quality of the fuel cell BT is diagnosed based on the measurement results of the membrane resistance and the reaction resistance. Further, the determination unit 13 quantifies the voltage V5 output from the divider 34 and the voltage V15 output from the divider 44, and displays each numerical value (measured value) and the quality determination result of the fuel cell BT. Display on the unit 14. As a result, the measured value of the membrane resistance and reaction resistance of the fuel cell BT and the diagnosis result are notified to the measurer.
[0023]
As described above, according to the diagnostic apparatus 1, the measurement signal obtained by mixing the first measurement signal and the second measurement signal for measuring the effective resistance values of the membrane resistance and reaction resistance of the fuel cell BT, respectively. By comprising the signal generating unit 11 to be generated and the measuring unit 12 for measuring the respective effective resistance values of the membrane resistance and the reaction resistance, it is possible to simultaneously measure the effective resistance values of the membrane resistance and the reaction resistance. it can. Therefore, since the time required for measurement can be shortened, the effective resistance of the fuel cell BT can be measured efficiently. In addition, since the determination unit 13 is provided, the quality of the fuel cell can be automatically diagnosed. Further, by providing the display unit 14, the measurer can visually recognize the determination result reliably and can easily check the measurement value.
[0024]
The present invention is not limited to the above-described embodiment of the present invention. For example, in the above-described diagnosis apparatus 1, the example in which the signal generation unit 11 is configured by including the oscillators 21 and 22 that generate signals having fixed frequencies has been described. However, the diagnosis apparatus 1 includes a DDS or PLL circuit that can arbitrarily set the frequency. A signal generation unit can also be configured. Moreover, the diagnostic apparatus 1 can also be incorporated in the fuel cell to be measured. In this case, for example, by providing a timer for measuring the measurement start time, the self-diagnosis of the fuel cell BT can be performed regularly and automatically. In addition, by providing a recording device for recording the measured value, it is possible to grasp the transition of the measured value and predict the life of the fuel cell by this.
[0025]
【The invention's effect】
As described above, according to the resistance measuring apparatus of the first aspect, measurement is performed by mixing the first measurement AC signal for measuring the membrane resistance and the second measurement AC signal for measuring the reaction resistance. A measurement signal generator for generating a signal for use, and a second measurement value for obtaining a resistance value of the membrane resistance based on the current value of the first AC signal for measurement flowing through the membrane resistance and the voltage generated in the membrane resistance and flowing through the reaction resistance Since the measurement unit for obtaining the resistance value of the reaction resistance based on the current value of the alternating current signal and the voltage generated in the reaction resistance is provided, the effective resistance values of the membrane resistance and the reaction resistance can be measured simultaneously. The effective resistance value of the fuel cell can be efficiently measured in a short time.
[0026]
Further, according to the resistance measuring device of this first band-pass filter, second bandpass filter, the first synchronous rectifier circuit, the second synchronous rectifier circuit, the measurement unit comprises a first divider and a second divider By comprising, each effective resistance value of a membrane resistance and reaction resistance can be measured simultaneously and correctly.
[0027]
In addition, according to the diagnostic device of the second and third aspects, the resistance measuring device and whether or not the effective resistance value of the membrane resistance is within a predetermined range and whether the effective resistance value of the reaction resistance is equal to or less than a predetermined upper limit value are determined. By including the determination unit for determining whether or not the fuel cell is good, it is possible to efficiently and automatically diagnose the quality of the fuel cell.
[0028]
Further, according to the measurement device of the fourth aspect, by providing the display unit that displays the determination result of the determination unit, it is possible to reliably notify the measurer of the quality of the fuel cell.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing configurations of a diagnostic apparatus 1 and a fuel cell BT according to an embodiment of the present invention.
FIG. 2 is a Cole-Cole plot diagram showing the internal resistance of a general fuel cell, in which a solid line shows a Cole-Cole plot diagram for a non-defective fuel cell BT, and a broken line shows a bad fuel cell BT. A Cole-Cole plot diagram is shown.
FIG. 3 is a circuit diagram showing the configuration of a conventional resistance measuring device 61 and a fuel cell BT.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Diagnosis apparatus 2 Load 11 Signal generation part 12 Measurement part 13 Judgment part 14 Display part 21,22 Oscillator 31,41 Bandpass filter 32,42 Synchronous detection circuit 34,44 Divider 35,45 Comparator 38 Lower limit judgment power supply 39, 48 Power supply for upper limit judgment BT Fuel cell BT
CT Current detection sensor R1, R3 Membrane resistance R2, R4 Reaction resistance

Claims (4)

燃料電池の実効抵抗を測定する測定装置であって、
前記実効抵抗の一部を形成する膜抵抗を測定するための第１測定用交流信号と当該実効抵抗の一部を形成する反応抵抗を測定するための第２測定用交流信号とをミキシングして測定用信号を生成する測定用信号生成部と、測定部とを備え、
前記測定部は、前記測定用信号を前記燃料電池に印加した状態において前記燃料電池を流れる前記測定用信号の電流値に応じた電圧を入力したときに前記膜抵抗を流れる前記第１測定用交流信号の電流値に応じた電圧を出力する第１バンドパスフィルタと、前記燃料電池の両電極間に発生する電圧と前記第１測定用交流信号の電流値に応じた電圧とで同期検波して前記膜抵抗に発生する電圧を検出する第１同期整流回路と、当該第１同期整流回路によって検出された電圧を前記第１測定用交流信号の電流値に応じた電圧で除算することによって前記膜抵抗の抵抗値を求める第１除算器と、前記測定用信号を前記燃料電池に印加した状態において前記燃料電池を流れる前記測定用信号の電流値に応じた電圧を入力して前記反応抵抗を流れる前記第２測定用交流信号の電流値に応じた電圧を出力する第２バンドパスフィルタと、前記燃料電池の前記両電極間に発生する電圧と前記第２測定用交流信号の電流値に応じた電圧とで同期検波して前記反応抵抗に発生する電圧を検出する第２同期整流回路と、当該第２同期整流回路によって検出された電圧を前記第２測定用交流信号の電流値に応じた電圧で除算することによって前記反応抵抗の抵抗値を求める第２除算器とを備えて構成されている抵抗測定装置。A measuring device for measuring the effective resistance of a fuel cell,
Mixing a first measurement AC signal for measuring a film resistance forming a part of the effective resistance and a second measurement AC signal for measuring a reaction resistance forming a part of the effective resistance; comprising a measurement signal generator that generates a measurement signal, and a measurement tough,
The measuring unit receives the voltage corresponding to the current value of the measurement signal flowing through the fuel cell in a state where the measurement signal is applied to the fuel cell, and the first AC for measurement flows through the membrane resistance. A first band-pass filter that outputs a voltage corresponding to the current value of the signal, and a synchronous detection using a voltage generated between both electrodes of the fuel cell and a voltage corresponding to the current value of the first AC signal for measurement. A first synchronous rectifier circuit for detecting a voltage generated in the film resistor; and the voltage detected by the first synchronous rectifier circuit is divided by a voltage corresponding to a current value of the first AC signal for measurement. A first divider for obtaining a resistance value of the resistor, and a voltage corresponding to a current value of the measurement signal flowing through the fuel cell in a state where the measurement signal is applied to the fuel cell, to flow through the reaction resistor Above A second band-pass filter that outputs a voltage according to the current value of the AC signal for measurement, a voltage generated between the electrodes of the fuel cell, and a voltage according to the current value of the second AC signal for measurement. A second synchronous rectifier circuit for detecting a voltage generated in the reaction resistor by synchronous detection at a first frequency, and a voltage detected by the second synchronous rectifier circuit divided by a voltage corresponding to a current value of the second AC signal for measurement And a second divider for determining a resistance value of the reaction resistance . 燃料電池の良否を診断する診断装置であって、
請求項１記載の抵抗測定装置と、前記膜抵抗の抵抗値が所定範囲内か否かを判定すると共に前記反応抵抗の抵抗値が所定の上限値以下か否かを判定する判定部とを備えている診断装置。A diagnostic device for diagnosing the quality of a fuel cell,
1 SL and mounting of the resistance measuring apparatus according to claim, and a determination unit for determining the resistance value of the reaction resistance is whether less than a predetermined upper limit value the resistance value of the film resistance is determined whether within a predetermined range Diagnostic device provided. 前記判定部は、前記膜抵抗の抵抗値が前記所定範囲を外れているとき、または前記反応抵抗の抵抗値が前記所定の上限値を超えているときに、診断対象の前記燃料電池を不良と判定する請求項２記載の診断装置。The determination unit determines that the fuel cell to be diagnosed is defective when the resistance value of the membrane resistance is out of the predetermined range or when the resistance value of the reaction resistance exceeds the predetermined upper limit value. The diagnostic apparatus according to claim 2 for determining. 前記判定部の判定結果を表示する表示部を備えている請求項２または３記載の診断装置。The determination of the determination result diagnostic apparatus according to claim 2 or 3, wherein a display unit for displaying.
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