JP2007066589A - Characteristic evaluation method and device of fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a characteristic evaluation method capable of finely evaluating a fuel cell by taking in the influence of anode diffusion impedance in the evaluation of the electrical characteristics of the fuel cell, and to provide a characteristic evaluation device. <P>SOLUTION: For example, fitting is conducted by using the following equivalent circuit models; (1) a capacitor of a capacity value Ccal and resistance of a resistance value Rca1 connected in parallel equivalent to reaction impedance of a cathode, (2) a capacitor of a capacity value Cca2 and resistance of a resistance value Rca2 connected in parallel equivalent to diffusion impedance of a cathode, (3) a resistance of a resistance value Rir equivalent to the the resistance of a solid polymer membrane 1, (4) a capacitor of a capacity value Can2 and resistance of a resistance value Ran2 connected in parallel equivalent to diffusion impedance of an anode, and (5) a capacitor of a capacity value Can1 and resistance of a resistance value Ran1 connected in parallel equivalent to a reaction impedance of the anode are connected in series. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a characteristic evaluation method and a characteristic evaluation apparatus for evaluating electric characteristics of a fuel cell.

  Fuel cells that generate electricity by chemically reacting hydrogen and oxygen are known. Fuel cells are expected to provide a solution to energy and environmental problems. Further, as a method for evaluating the electrical characteristics of the fuel cell, a method of preparing an equivalent circuit model indicating the internal impedance of the fuel cell and fitting the parameters of the equivalent circuit model based on the measurement result is used.

JP-A-10-116622

  However, the conventional equivalent circuit model has a problem that the internal impedance of the fuel cell cannot be fully evaluated. It is known that there are fuel cell voltage losses due to membrane resistance, cathode reaction impedance, cathode diffusion impedance, anode reaction impedance, and anode diffusion impedance. However, since the conventional equivalent circuit model does not include the term of anode diffusion impedance, voltage loss cannot be evaluated correctly particularly in a region where the current density is large.

  Particularly in solid polymer membrane fuel cells, when the current density increases, the amount of water generated at the cathode into the anode increases. For this reason, it is conceivable that the generated water that has oozed through the membrane fills the gap between the electrodes and inhibits fuel diffusion at the anode. In the case of a system that uses fuel gas in a humidified state, the inhibition effect becomes even greater. In addition, when there is a temperature distribution in the electrode surface, the influence of condensation cannot be ignored.

  It is an object of the present invention to provide a fuel cell characteristic evaluation method and characteristic evaluation apparatus that enables precise evaluation of a fuel cell by incorporating the influence of anode diffusion impedance when evaluating the electric characteristics of the fuel cell. It is in.

The fuel cell characteristic evaluation method of the present invention is a method of evaluating the internal impedance of a fuel cell by fitting to an equivalent circuit model, and includes incorporating an anode diffusion impedance into the equivalent circuit model. Features.
According to this fuel cell characteristic evaluation method, since the anode diffusion impedance is incorporated into the equivalent circuit model, the influence of the anode diffusion impedance can be taken in when evaluating the electric characteristics of the fuel cell.

  The equivalent circuit model may incorporate membrane resistance, cathode reaction impedance, cathode diffusion impedance, and anode reaction impedance.

  The anode diffusion impedance may be expressed as an equivalent circuit in which a resistor and a capacitor are connected in parallel.

  The anode diffusion impedance is expressed as an equivalent circuit in which a resistance corresponding to the reaction resistance of the anode connected in series, a Warburg resistance corresponding to the anode diffusion resistance, and a capacitor corresponding to the electric double layer capacitance of the anode are connected in parallel. May be.

A cathode electrode and an anode electrode are disposed to face each other, the cathode electrode is divided into a cathode main electrode and a cathode divided electrode, the anode electrode is divided into an anode main electrode and an anode divided electrode, and the cathode divided electrode and the cathode divided electrode Preparing a fuel cell in which anode split electrodes are arranged opposite to each other in the same region, connecting a load between the cathode main electrode and the anode main electrode, and superimposing an alternating current component on the current flowing through the load; Measuring a frequency response of the voltage between the anode main electrode and the anode split electrode to the load current in a state where a load is connected between the cathode main electrode and the anode main electrode; and the measured load A step for fitting the parameters of the equivalent circuit model based on the current and the voltage. And up, it may be provided.
In this case, the frequency response of the voltage between the anode main electrode and the anode split electrode can be measured separately from the cathode side, so that precise fitting can be performed for the impedance on the anode side.

  The fuel cell may be a solid polymer membrane fuel cell.

The fuel cell characteristic evaluation apparatus of the present invention includes a load control unit that superimposes an AC component on a load current connected to the fuel cell, a measurement unit that measures a voltage frequency response of the fuel cell with respect to the load current, and the measured In a characteristic evaluation apparatus comprising a fitting means for fitting a parameter of an equivalent circuit model based on a voltage frequency response, an anode diffusion impedance is incorporated in the equivalent circuit model.
According to this fuel cell characteristic evaluation apparatus, since the anode diffusion impedance is incorporated into the equivalent circuit model, the influence of the anode diffusion impedance can be taken in when evaluating the electric characteristics of the fuel cell.

  The equivalent circuit model may incorporate membrane resistance, cathode reaction impedance, cathode diffusion impedance, and anode reaction impedance.

  The anode diffusion impedance may be expressed as an equivalent circuit in which a resistor and a capacitor are connected in parallel.

  The anode diffusion impedance is expressed as an equivalent circuit in which a resistance corresponding to the reaction resistance of the anode connected in series, a Warburg resistance corresponding to the anode diffusion resistance, and a capacitor corresponding to the electric double layer capacitance of the anode are connected in parallel. May be.

In the fuel cell, a cathode electrode and an anode electrode are arranged to face each other, the cathode electrode is divided into a cathode main electrode and a cathode divided electrode, the anode electrode is divided into an anode main electrode and an anode divided electrode, The cathode split electrode and the anode split electrode are arranged to face each other in the same region, and the load control means superimposes an alternating current component on a current flowing in a load connected between the cathode main electrode and the anode main electrode. The measuring unit may measure a frequency response to a current of a voltage between the anode main electrode and the anode divided electrode.
In this case, the frequency response of the voltage between the anode main electrode and the anode split electrode can be measured separately from the cathode side, so that precise fitting can be performed for the impedance on the anode side.

  The fuel cell may be a solid polymer membrane fuel cell.

  According to the fuel cell characteristic evaluation method of the present invention, the anode diffusion impedance is incorporated into the equivalent circuit model, so that the influence of the anode diffusion impedance can be taken in when evaluating the electric characteristics of the fuel cell.

  According to the fuel cell characteristic evaluation apparatus of the present invention, since the anode diffusion impedance is incorporated into the equivalent circuit model, it is possible to incorporate the influence of the anode diffusion impedance when evaluating the electric characteristics of the fuel cell.

  FIG. 1 is a diagram illustrating an equivalent circuit model of a fuel cell used in a fuel cell evaluation method according to the present invention.

  In the equivalent circuit model shown in FIG. 1A, (1) a capacitor having a capacitance value Cca1 connected in parallel and a resistance having a resistance value Rca1 corresponding to the reaction impedance of the cathode, and (2) corresponding to a diffusion impedance of the cathode. A parallel-connected capacitor having a capacitance value Cca2 and a resistance having a resistance value Rca2, (3) a resistance having a resistance value Rir corresponding to the resistance of the solid polymer film 1, and (4) a parallel corresponding to the diffusion impedance of the anode A connected capacitor having a capacitance value Can2 and a resistance having a resistance value Ran2 are connected in series with (5) a capacitor having a capacitance value Can1 connected in parallel and a resistance having a resistance value Ran1 corresponding to the reaction impedance of the anode. .

  In the equivalent model shown in FIG. 1B, (6) the resistance of the resistance value Rca1 corresponding to the reaction resistance of the cathode connected in series and the resistance of the resistance value Wca corresponding to the diffusion resistance of the cathode, and the electric double layer of the cathode A circuit in which a capacitor having a capacitance value Cca0 corresponding to the capacitance is connected in parallel, (7) a resistance having a resistance value Rir corresponding to the resistance of the solid polymer film 1, and (8) a reaction resistance of the anode connected in series. A circuit in which a resistor having a corresponding resistance value Ran1 and a resistor having a resistance value Wan corresponding to the anode diffusion resistance and a capacitor having a capacitance value Can0 corresponding to the electric double layer capacitance of the anode are connected in parallel are connected in series. The

  Hereinafter, Example 1 of the fuel cell characteristic evaluation method will be described with reference to FIGS.

  2A is a cross-sectional view showing the configuration of the fuel cell to be evaluated, and FIG. 2B is a plan view seen from the right side of FIG. 2A.

  As shown in FIG. 2A, the fuel cell 100 of this embodiment is a solid polymer fuel cell including a solid polymer membrane 1 that partitions the fuel cell 100 into a cathode side and an anode side. On the cathode side, cathode catalyst layers 21A and 21B, cathode diffusion layers 22A and 22B, and a cathode electrode are sequentially laminated from the solid polymer membrane 1 side to the left. On the anode side, anode catalyst layers 31A and 31B, anode diffusion layers 32A and 32B, and an anode electrode are sequentially laminated from the solid polymer membrane 1 side to the right. These layers are formed substantially uniformly in a region where the cathode electrode and the anode electrode are formed, and the cathode electrode 2 and the anode electrode 3 are arranged to face each other with a uniform distance.

  A cathode gas flow path 26 is formed between the cathode electrode and the case 4, and a cathode gas flow path 36 is formed between the anode electrode and the case 4. An oxidant (air or oxygen) is applied to the cathode electrode, and a fuel gas is applied to the anode electrode. The shapes of the cathode gas channel 26 and the cathode gas channel 36 are not shown, but these channels are appropriately formed in a shape for controlling the supply amount (concentration) of the fuel gas.

  As shown in FIGS. 2 (a) and 2 (b), the cathode electrode is divided into a cathode main electrode 2A and a cathode split electrode 2B, which are electrically separated. The anode electrode is divided into an anode main electrode 3A and an anode split electrode 3B, and both are electrically separated. As shown in FIG. 2A and FIG. 2B, the cathode divided electrode 2B and the anode divided electrode 3B are provided in a relatively small same region of the cathode electrode and the anode electrode, and are arranged to face each other. .

  As shown in FIG. 2A, a terminal 24 is connected to the cathode main electrode 2A, and a terminal 25 is connected to the cathode split electrode 2B, and is drawn out of the case 4. A terminal 34 is connected to the anode main electrode 3 </ b> A, and a terminal 35 is connected to the anode divided electrode 3 </ b> B, and is drawn out of the case 4.

  FIG. 3 is a diagram showing a method for measuring the electrical characteristics of the fuel cell.

  As shown in FIG. 3, an electronic load 5 is connected between the cathode main electrode 2A and the anode main electrode 3A via the terminal 24 and the terminal 34. Further, the potentials of the cathode main electrode 2A, the cathode divided electrode 2B, the anode main electrode 3A, and the anode divided electrode 3B are measured via the terminal 24, the terminal 25, the terminal 34, and the terminal 35.

  As shown in FIG. 3, when the fuel cell 100 generates power, the cell voltage V between the cathode main electrode 2A and the anode main electrode 3A, the voltage V1 between the cathode divided electrode 2B and the anode divided electrode 3B, the anode divided electrode 3B and the anode main electrode are generated. The voltage V2 between the electrodes 3A and the voltage V3 between the cathode split electrode 2B and the cathode main electrode 2A are measured.

  FIG. 4 is a diagram illustrating the voltage characteristics of the fuel cell. As shown in FIG. 4, the cell voltage V is represented by subtracting various overvoltages or voltage losses from the theoretical open circuit voltage Voc. In view of the performance of the fuel cell 100, it is desirable to suppress these overvoltages or loss voltages.

  In general, it is considered that the cathode activation overvoltage Vca1 and the cathode concentration overvoltage Vca2 exist as the cathode overvoltage. The cathode activation overvoltage Vca1 is an overvoltage that depends on the energy required for the chemical reaction on the cathode side, and the cathode concentration overvoltage Vca2 is an overvoltage that depends on the gas concentration on the cathode side. Further, it is considered that an anode activation overvoltage Van1 and an anode concentration overvoltage Van2 exist as the overvoltage on the anode side. The anode activation overvoltage Van1 is an overvoltage that depends on the energy required for the chemical reaction on the anode side, and the anode concentration overvoltage Van2 is an overvoltage that depends on the gas concentration on the anode side. In FIG. 4, the theoretical open circuit voltage Voc is corrected by power generation conditions, that is, temperature and supply gas pressure. Further, the resistance overvoltage Vr including the membrane resistance of each part of the fuel cell 100 is shown collectively on the cathode side.

  The difference between the voltage V1 between the cathode split electrode 2B and the anode split electrode 3B and the theoretical open circuit voltage Voc is considered to correspond to the loss voltage Vco resulting from the fuel crossover through the solid polymer membrane 1.

  In this embodiment, the voltage V2 corresponds to the anode-side overvoltage and the voltage V3 corresponds to the cathode-side overvoltage, and the anode-side overvoltage and the cathode-side overvoltage can be measured separately. Therefore, more detailed and useful information can be obtained as information necessary for performance management.

  These overvoltages can be used as evaluation targets in the inspection after manufacturing of the fuel cell 100 and the inspection at the time of shipment. In addition, by measuring the overvoltage, it is possible to examine the change with time of the fuel cell. For example, in the long term, the permeability of the fuel gas through the solid polymer film 1 becomes high due to film deterioration or the like, and the overvoltage Vco due to the fuel crossover increases. For this reason, the value of the overvoltage Vco can be used as a management value for determining the degree of film degradation.

  Further, as shown in FIG. 4, there is a relationship of “V1 = V + V2 + V3”. For this reason, when all the voltages V, V1, V2, and V3 are measured, it is possible to perform a verification using the measured values, and to improve the reliability of the measurement.

  By fitting the measurement result of the electrical impedance to an equivalent circuit model, it becomes possible to separate the activation overvoltage, concentration overvoltage, membrane resistance overvoltage, activation overvoltage on the cathode side, and concentration overvoltage on the anode side. By this modeling, each overvoltage can be related to each element (diffusion layer, catalyst layer, membrane) of the fuel cell, and design feedback for performance improvement becomes possible. Further, comparison with an ideal (design) model and difference management are possible for each element in pass / fail judgment at the time of shipment. In the evaluation of deterioration over time, a change in the initial equivalent circuit constant can be used as an index.

  FIG. 5 is a block diagram illustrating a configuration of a measurement apparatus that measures the electrical characteristics of the fuel cell 100.

  As shown in FIG. 5, the measuring device 70 includes a measurement unit 71 that acquires the voltages V, V1, V2, and V3, and a calculation unit 72 that performs a calculation based on the voltage value obtained via the measurement unit 71. , An output unit 73 that outputs a voltage value acquired by the measurement unit 71 or a calculation result in the calculation unit 72, a measurement unit 71, a calculation unit 72, an output unit 73, and a control unit 74 that controls the electronic load 5.

  FIG. 6 is a flowchart showing an operation procedure of the measuring apparatus 70. This procedure is executed based on the control of the control unit 74.

  Steps S11 to S23 in FIG. 6 show the AC component measurement procedure.

  In step S11 of FIG. 6, the electronic load 5 is controlled to give a load of a predetermined direct current between the cathode main electrode 2A and the anode main electrode 3A. Next, in step S12, the voltage V, V1, V2, V3, and the current value A are acquired by the measuring unit 71.

  Next, in step S13, the calculation unit 72 performs verification using the acquired voltages V, V1, V2, and V3, and determines whether normal measurement is being performed. If the determination is affirmative, the process proceeds to step S14, and if the determination is negative, the process returns to step S12 to acquire the voltages V, V1, V2, and V3 again.

  In step S14, the acquired data of the voltages V, V1, V2, V3, and the current value A are output or stored via the output unit 73. By using the output or stored voltage V1 or V + V2 + V3, the loss voltage Vco caused by the fuel crossover shown in FIG. 3 (Vco is corrected by the gas temperature of the anode, the gas pressure, the gas temperature of the cathode, and the gas pressure). V1 (or obtained by subtracting V + V2 + V3) from the theoretical Voc can be calculated.

  In step S15, an alternating current having a desired amplitude and frequency is superimposed on the load. In step S16, the waveforms of the voltages V, V1, V2, V3 and current values are acquired. In step S17, impedance calculation is performed.

  Next, in step S18, it is determined whether measurement has been completed for all scheduled measurement conditions, for example, all frequencies. If the determination is affirmative, the process proceeds to step S20, and if the determination is negative, step S19 is performed. To change the frequency of the superimposed alternating current and return to step S15.

  Next, in step S20, it is determined whether or not all scheduled measurement conditions have been completed. If the determination is affirmative, the series of processing ends, and if the determination is negative, the direct current value is changed in step S21. The process returns to step S11. In this case, in step S19, the electronic load 5 is controlled in accordance with the next measurement condition, and the above measurement procedure (steps S12 to S17) is repeated.

  With the above procedure, the response characteristics of the voltage V2 and the voltage V3 when the frequency of the AC component applied to the load between the cathode main electrode 2A and the anode main electrode 3A is changed can be acquired.

  Next, in step S22, the calculation unit 72 performs the fitting of the parameters of the equivalent circuit model of the fuel cell from the frequency characteristics of the impedances of the voltage V2 and the voltage V3, and outputs the result in step S23.

  FIG. 7 is a diagram showing an example of an equivalent circuit model of a fuel cell. In FIG. 7, the capacitor Cca1 and resistor Rca1 connected in parallel are the cathode reaction impedance, the capacitor Cca2 and resistor Rca2 connected in parallel are the diffusion impedance of the cathode, and the capacitor Can1 and resistor Ran1 connected in parallel are the anode reaction impedance. The capacitor Can2 and the resistor Ran2 connected in parallel correspond to the diffusion impedance of the anode, respectively. The resistance Rir corresponds to the resistance value of the solid polymer film 1.

  The cathode activation overvoltage Vca1, the cathode concentration overvoltage Vca2, the anode activation overvoltage Van1, the anode concentration overvoltage Van2, and the resistance overvoltage Vr shown in FIG. 3 are the cathode reaction impedance, cathode diffusion impedance, and anode reaction, respectively. Generated based on impedance, anode diffusion impedance and resistance Rir.

  In step S22, the capacities of these capacitors and the resistance values of the resistors are fitted according to the phase relationship and gain relationship between the current and voltage V2 (or voltage V3). In this embodiment, the cathode-side overvoltage can be acquired as the voltage V3, and the anode-side overvoltage can be acquired as the voltage V2. Therefore, the capacitance and resistance values corresponding to the cathode reaction impedance and the cathode diffusion impedance are based on the relationship between the voltage V3 and the phase and gain of the current, and the capacitance and resistance values corresponding to the anode reaction impedance and the anode diffusion impedance are Based on the relationship between the voltage V2, the phase of the current, and the gain, each is calculated independently. Therefore, the overvoltage of the fuel cell can be calculated separately for the anode and the cathode.

  Next, in step S23, the calculation result by fitting is output via the output part 74, and a series of procedures are complete | finished.

  In this embodiment, an equivalent circuit model incorporating the anode diffusion impedance is used, so that an equivalent circuit in which the influence of the anode diffusion impedance is accurately reflected can be obtained. In particular, the actual behavior of the fuel cell can be accurately shown even in a region where the current density is large.

  In the present embodiment, the cathode-side overvoltage can be acquired as the voltage V3, and the anode-side overvoltage can be acquired as the voltage V2. For this reason, the capacitance and resistance values corresponding to the cathode reaction impedance and the cathode diffusion impedance are based on the voltage V3, and the capacitance and resistance values corresponding to the anode reaction impedance and the anode diffusion impedance are based on the voltage V2 and are independent of each other. Is calculated. Therefore, it is possible to accurately calculate these capacitance and resistance values.

  In the first embodiment, an example in which the cathode-side overvoltage and the anode-side overvoltage are measured separately is shown. However, the present invention is also applicable to the case where the overvoltages on the cathode side and the anode side are measured together.

  As shown in FIG. 8, the voltage between the cathode electrode 102 and the anode electrode 103 when an electronic load 5 is connected between the cathode electrode 102 and the anode electrode 103 not provided with the divided electrodes and an alternating current is superimposed on the load current. The frequency response can be measured for V. In this case, the parameters of the equivalent circuit model of FIG. 1A or 1B may be fitted based on the measured frequency response of the voltage V.

  However, with this method, it is impossible to measure the cathode-side overvoltage and the anode-side overvoltage separately. For this reason, it is difficult to accurately calculate the value of each parameter compared to the first embodiment.

  The scope of application of the present invention is not limited to the above embodiment. The present invention is not limited to the measurement of electrical characteristics for a polymer electrolyte fuel cell, and can be widely applied to the measurement for all fuel cells.

It is a figure which shows the equivalent circuit model of the fuel cell used with the evaluation method of the fuel cell by this invention, (a) is a figure which shows an example of an equivalent circuit model, (b) is a figure which shows another example. It is a figure which shows the structure of a fuel cell, (a) is sectional drawing, (b) is a top view. The figure which shows the method of measuring the electrical property of a fuel cell. The figure explaining the voltage characteristic of a fuel cell. The block diagram which shows the structure of the measuring apparatus which measures the electrical property of a fuel cell. The flowchart which shows the operation | movement procedure of a measuring apparatus. The figure which shows an example of the equivalent circuit model of a fuel cell. The figure which shows the measuring method with respect to the fuel cell in which the division | segmentation electrode is not provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solid polymer film 2A Cathode main electrode 2B Cathode division | segmentation electrode 3A Anode main electrode 3B Anode division | segmentation electrode 5 Electronic load (load)
70 Measuring device (characteristic evaluation device)
71 Measuring unit (measuring means)
72 Calculation unit (fitting means)
100 Fuel cell

Claims (12)

In the fuel cell characteristics evaluation method for evaluating the electrical characteristics of the fuel cell by fitting to an equivalent circuit model,
A method for evaluating the characteristics of a fuel cell, comprising incorporating an anode diffusion impedance into the equivalent circuit model. 2. The method for evaluating characteristics of a fuel cell according to claim 1, wherein membrane resistance, cathode reaction impedance, cathode diffusion impedance, and anode reaction impedance are incorporated into the equivalent circuit model. 3. The fuel cell characteristic evaluation method according to claim 1, wherein the anode diffusion impedance is expressed as an equivalent circuit in which a resistor and a capacitor are connected in parallel. The anode diffusion impedance is expressed as an equivalent circuit in which a resistance corresponding to the reaction resistance of the anode connected in series, a Warburg resistance corresponding to the anode diffusion resistance, and a capacitor corresponding to the electric double layer capacitance of the anode are connected in parallel. The method for evaluating characteristics of a fuel cell according to claim 1 or 2, wherein: A cathode electrode and an anode electrode are disposed to face each other, the cathode electrode is divided into a cathode main electrode and a cathode divided electrode, the anode electrode is divided into an anode main electrode and an anode divided electrode, and the cathode divided electrode and the cathode divided electrode Prepare a fuel cell in which anode split electrodes are arranged opposite to each other in the same region,
Connecting a load between the cathode main electrode and the anode main electrode, and superimposing an AC component on the current flowing through the load;
Measuring a frequency response of a voltage to the load current between the anode main electrode and the anode split electrode with a load connected between the cathode main electrode and the anode main electrode;
Fitting parameters of the equivalent circuit model based on the measured load current and voltage;
5. The fuel cell characteristic evaluation method according to claim 1, comprising: The fuel cell characteristic evaluation method according to claim 1, wherein the fuel cell is a solid polymer membrane fuel cell. Load control means for superimposing an AC component on the current of the load connected to the fuel cell;
Measuring means for measuring the frequency response of the fuel cell to the load current;
Fitting means for fitting parameters of an equivalent circuit model based on the measured frequency response;
In a characteristic evaluation apparatus comprising:
An apparatus for evaluating characteristics of a fuel cell, wherein an anode diffusion impedance is incorporated in the equivalent circuit model. 8. The fuel cell characteristic evaluation apparatus according to claim 7, wherein membrane resistance, cathode reaction impedance, cathode diffusion impedance, and anode reaction impedance are incorporated in the equivalent circuit model. 9. The fuel cell characteristic evaluation apparatus according to claim 7, wherein the anode diffusion impedance is expressed as an equivalent circuit in which a resistor and a capacitor are connected in parallel. The anode diffusion impedance is expressed as an equivalent circuit in which a resistance corresponding to the reaction resistance of the anode connected in series, a Warburg resistance corresponding to the anode diffusion resistance, and a capacitor corresponding to the electric double layer capacitance of the anode are connected in parallel. The fuel cell characteristic evaluation apparatus according to claim 7 or 8, In the fuel cell, a cathode electrode and an anode electrode are arranged to face each other, the cathode electrode is divided into a cathode main electrode and a cathode divided electrode, the anode electrode is divided into an anode main electrode and an anode divided electrode, The cathode split electrode and the anode split electrode are arranged to face each other in the same region,
The load control means superimposes an alternating current component on a current flowing in a load connected between the cathode main electrode and the anode main electrode,
11. The fuel cell characteristic according to claim 7, wherein the measuring unit measures a frequency response of a voltage with respect to the load current between the anode main electrode and the anode split electrode. Evaluation device. 12. The fuel cell characteristic evaluation apparatus according to claim 7, wherein the fuel cell is a solid polymer membrane fuel cell.

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