JP4459081B2 - Current density distribution measuring device - Google Patents

Description

  The present invention relates to a technique for measuring a current density distribution.

  Conventionally, a method for measuring a current density distribution in an electrode has been proposed for various purposes such as flow path design evaluation, failure detection, and quality assurance of a fuel cell. For example, Patent Document 1 discloses a method of estimating a current density distribution by inserting a potential measurement line or a thermocouple into a reaction gas flow path and measuring a resistance potential drop or temperature of each portion. On the other hand, Patent Document 2 discloses a method of measuring a current density distribution of a separator by connecting a plurality of electrodes to a separator via a carbon terminal and measuring a current flowing through each electrode.

Japanese Patent Laid-Open No. 9-223512 JP 2004-152501 A

  However, the estimation based on the resistance potential drop and the temperature is not a direct measurement of the current value but merely an estimation, and there is a problem that the measurement reliability is low. On the other hand, in the measurement using a plurality of electrodes, a leakage current flowing between the plurality of electrodes inside a measurement target such as a carbon terminal or a separator causes a measurement error of the current density distribution. Furthermore, such a problem is not limited to a fuel cell, and is a problem common when measurement of a current density distribution is widely required.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a technique for improving measurement accuracy in a measurement device that measures a current density distribution.

In order to solve at least a part of the above-described problems, the present invention provides a measurement device that measures a current density distribution of a measurement target that supplies power to a load . This measuring device
A current collecting plate;
Provided in the current collection plate, a plurality of contact points of the measurement object, and a plurality of electrodes which causes conduction between the current collection plate and the contact point by contacting the measurement object,
A plurality of sensors provided on each of the plurality of electrodes and measuring an electrode current flowing through each of the plurality of electrodes;
With
The measuring device includes a circuit that is the measurement object, a resistance value Rb between contact points that is a resistance value between the plurality of contact points in the measurement object, and a resistance value between each contact point and the current collecting plate. Using an equivalent circuit of an electric circuit composed of a resistance value Rc and the load, the relationship between the equivalent circuits including the contact points of the electrodes among the plurality of electrodes is two-dimensionally modeled. Applying the measured electrode currents to the circuit equations according to Kirchhoff's law for the two-dimensionally modeled equivalent circuits to obtain the current density distribution of the measurement object. Features.

  In the measuring device of the present invention, the current density distribution of the measurement object is measured according to the resistance value Rb between the contact points, the circuit resistance value Rc, and each electrode current. It is possible to realize measurement with high measurement accuracy considering the above.

  Note that the “resistance value Rb between contact points” is a resistance value in the measurement target, and does not include the contact resistance between the measurement target and the electrode. On the other hand, the “circuit resistance value Rc” includes the contact resistance between the measurement object and the electrode, and also includes the contact resistance between the electrode and the confluence when the electrode and the confluence are not integrated. Including.

In the measurement apparatus, when the maximum value of the current output ratio of the measurement target assumed between the plurality of contact points is the maximum output ratio Pr and the allowable error is Er, the following equation is satisfied : A circuit resistance value Rc and a resistance value Rb between the contact points are configured, and each electrode current measured by the plurality of electrodes is output at a contact point where the electrodes are in contact with each other. You may comprise so that it may be considered. The allowable error Er> absolute value (1-((the maximum output ratio Pr + 1) × the circuit resistance value Rc + the resistance value Rb between the contact points) / (2 × the circuit resistance value Rc + the resistance value between the contact points Rb))
However, the absolute value means a function that returns an absolute value.

  By so doing, the measurement error due to the leakage current flowing between the plurality of electrodes can be within a presumed allowable range, so that measurement reliability can be improved.

  Such a configuration can be realized by at least one of “increase in resistance value Rb between contact points” and “decrease in circuit resistance value Rc”. “Increase in resistance value Rb between contact points” can be realized by, for example, increasing the resistance value of a measurement object or a measurement jig having contact points or increasing the pitch between contact points. On the other hand, the “decrease in the circuit resistance value Rc” can be realized, for example, by eliminating contact resistance by integrating circuits of a measuring device described later, or by reducing contact resistance by applying liquid metal to the contact surface.

In the measurement device, the circuit resistance value Rc is configured to be equal to or less than one fifth of the resistance value Rb between the contact points,
The measurement device may have a simple configuration in which each electrode current measured by the plurality of electrodes is regarded as a current output at a contact point where each electrode contacts.

  In this way, the measurement error caused by the leakage current flowing between the plurality of electrodes can be set to the general accuracy required in the current density distribution, so that the measurement reliability can be easily increased.

In the measurement apparatus, the circuit resistance value Rc is a combined resistance of a contact resistance between each contact point to be measured and the electrode and a contact resistance between the electrode and the current collecting plate. Therefore, the current density distribution may be measured.

  Since most of the circuit resistance value Rc is occupied by the contact resistance, a simple and practical measuring device can be realized by regarding the sum of the contact resistances as the circuit resistance value Rc.

In the measurement apparatus, the plurality of electrodes and the current collecting plate are configured as a single unit,
The circuit resistance value Rc may be regarded as a contact resistance between each contact point to be measured and the electrode, and the current density distribution may be measured.

  In this way, the circuit resistance value Rc can be reduced by configuring the electrode and the junction part as one body and eliminating the contact resistance between the electrode and the junction part.

  In the measurement apparatus, the liquid resistance is applied between each of the plurality of electrodes and the measurement target, so that the contact resistance between each of the plurality of electrodes and the measurement target is reduced. You may make it.

  Thus, the circuit resistance value Rc can also be reduced by reducing the contact resistance by applying liquid metal to the contact surface.

  In the measuring apparatus, the liquid metal is preferably an alloy containing gallium and indium. This is because an alloy containing gallium and indium has favorable properties for this purpose in that it has low toxicity and low resistance.

In the measurement apparatus, the measurement object is a battery electrode of a fuel cell provided with a reaction gas flow path,
The distance between each contact surface between each of the plurality of electrodes and the measurement target may be configured to be not more than twice the pitch in the width direction of the reaction gas channel. .

  If it carries out like this, the increase in the contact resistance of a battery electrode and a reactive gas flow path resulting from the nonuniformity of the pressure with respect to a reactive gas flow path may be suppressed.

  In the measurement apparatus, the pitch between the plurality of electrodes is made smaller than the size in the direction perpendicular to the plurality of electrode axes of the sensor by shifting the sensors in the axial direction of the plurality of electrodes. It may be configured as follows.

  In this way, it is possible to increase the density of measurement points while ensuring the sensor size and maintaining the sensing accuracy.

In the measurement apparatus, the measurement object is a battery electrode of a fuel cell provided with a reaction gas flow path,
The plurality of electrodes are:
An electrode rod for guiding current to the current collecting plate ;
At each contact point of the measurement object, a contact terminal for contacting in an area wider than the cross-sectional area of the electrode rod,
With
The measuring device may further include a pressure plate that presses each of the contact terminals integrally with the measurement target.

  In this way, the battery electrode suppresses the variation in the contact resistance between the battery electrode and the reaction gas channel and the contact resistance between the collector electrode and the separator caused by the non-uniform pressure on the peak of the reaction gas channel. Can do.

In the above measuring device,
A biasing portion may be provided between the pressure plate and each of the contact terminals.

  By so doing, it is possible to further suppress variation in contact resistance between the battery electrode and the reactive gas flow path, or between the current collecting electrode and the separator, and increase the measurement accuracy.

In the above measuring device,
The plurality of electrodes have a contact surface including a central region capable of conducting by contact and a closed peripheral region surrounding the central region,
The peripheral region may be insulated.

  If it carries out like this, resistance value Rb between contact points can be increased, making a contact point space | interval small.

  Note that the present invention can be realized in a current distribution measuring method, a device such as a fuel cell equipped with the current distribution measuring device, and other various aspects.

Hereinafter, embodiments of the present invention will be described in the following order based on examples.
A. Configuration of the current distribution measuring apparatus in the first embodiment of the present invention:
B. Measuring method in the first embodiment of the present invention:
C. Measurement method in the second embodiment of the present invention:
D. Variations:

A. Configuration of the current distribution measuring apparatus in the first embodiment of the present invention:
FIG. 1 is a schematic configuration diagram of a current distribution measuring apparatus 100 and a measurement target in the first embodiment of the present invention. The current distribution measuring apparatus 100 is electrically connected between a plurality of measuring electrodes 120, a current collecting plate 111, an end plate 109 and a terminal plate 107 as measuring jigs, and the current collecting plate 111 and the terminal plate 107. And a load 110 which is a connected resistor. In the present embodiment, the current distribution measuring device 100 is the measurement target of the fuel cell 201.

  In this embodiment, the fuel cell 201 is a polymer electrolyte fuel cell including a membrane electrode assembly 202 and two carbon separators 203 and 204 that sandwich the membrane electrode assembly 202 from both sides. The two separators 203 and 204 are formed with gas flow paths (not shown) through which the reaction gas flows on the membrane electrode assembly 202 side. The fuel battery cell 201 generates electric power by the reaction of the reaction gas and outputs it to the outside through the two separators 203 and 204.

  In the present embodiment, the current distribution output from the separator 204 is measured in order to estimate the reaction state of the reaction gas in each part of the membrane electrode assembly 202 sandwiched between the two separators 203 and 204. Such a current distribution can be measured by measuring a current value output from each part of the separator 204.

FIG. 2 is an enlarged view of a plurality of measurement electrodes 120 that measure the current value output from each portion of the separator 204. Each of the measurement electrodes 120 includes a rod 128, two current collecting electrodes 124 and 125 connected to both ends of the rod 128, and a current sensor 126. Here, the collecting electrode 125 is in contact with the separator 204 in an area wider than the cross-sectional area of the rod 128.

  In this embodiment, the current sensor 126 is a sensor using a Hall element that can measure a change in magnetic field with high sensitivity. The current sensor 126 outputs an electrical signal corresponding to a magnetic field that changes according to the current flowing through the rod 128.

  FIG. 3 is an explanatory view showing an arrangement state of the collecting electrodes 125 on the separator 204 in the first embodiment of the present invention. In this embodiment, the interval between the collecting electrodes 125 is set to 3 mm. Such a setting is preferably set so that the interval between the collecting electrodes 125 is not more than twice the pitch in the width direction of the flow path formed in the separator 204. This is because the pressing pressure by the plurality of collecting electrodes 125 is uniformly transmitted to each flow path.

  FIG. 4 shows an equivalent circuit of an electric circuit composed of the current distribution measuring device 100 and the fuel cell 201 to be measured. This equivalent circuit includes a fuel cell 201 that generates electric power, a resistance Rb, a contact resistance Rc1, a wiring resistance Rc2, and a load 110. The resistance Rb is a resistance inside the separator 204 between the adjacent collector electrodes 125. The contact resistance Rc1 is a contact resistance generated due to the contact between the current collecting electrode 125 and the separator 204. The wiring resistance Rc2 is the wiring resistance of the current distribution measuring apparatus 100 as a whole.

  FIG. 5 is an explanatory diagram showing a part of the equivalent circuit extracted for easy understanding. As described above, in this embodiment, the current value output from each part of the separator 204 is measured in order to estimate the reaction state of the reaction gas in each part of the membrane electrode assembly 202. Such measurement is performed by measuring the value of the current flowing through the measurement electrode 120. Specifically, the current values i1 and i2 output by the potentials v1 and v2 generated in the respective parts of the separator 204 are obtained by measuring the current values i3 and i4 flowing through the two measurement electrodes 120. It is measured.

  However, the current values i1 and i2 are not simply proportional to the current values i3 and i4, respectively. This is because the current flows also inside the separator 204, so that the current leaks from the portion where the potential v2 is generated to the measurement electrode 120 side where the current value i3 flows. A measurement method that takes into account the quantitative analysis of such leakage is disclosed below.

B. Measuring method in the first embodiment of the present invention:
The circuit equation of the equivalent circuit of FIG. 5 is as follows. Here, in order to make the circuit equation easy to understand, it is assumed that the combined resistance of the contact resistance Rc1 and the wiring resistance Rc2 is the circuit resistance Rc, and v2> v1. The following equation is derived by Kirchhoff's law.
(1) First formula: i1 + i2 = i3 + i4
(2) Second formula: i3 = i1 + i5
(3) Third formula: i4 = i2-i5

Further, when attention is paid to the potential of each part, the following expression is derived.
(1) Fourth formula: v1 = v2−Rb × i5
(2) Formula 5: v0 = v1-Rc × i3
(3) Sixth formula: v0 = v2-Rc × i4

When the simultaneous equations of the first to sixth formulas are solved, the following formula is derived.
(1) Formula 7: i1 = i3 + Rc / Rb (i3-i4)
(2) Eighth Formula: i2 = i4 + Rc / Rb (−i3 + i4)
Here, the currents i1 and i2 are currents to be measured, and the currents i3 and i4 are currents measured by the current sensor 126. The second term of the seventh and eighth equations corresponds to the current leaking inside the separator 204.

  Thus, if each equivalent circuit including the point where the measurement electrode 120 contacts is regarded as each element to be measured, the relationship between the equivalent circuits can be modeled two-dimensionally as a deterministic system. The model configured as described above can be solved by an analysis tool using a finite element method.

  As described above, in this embodiment, the current density distribution of the measurement target can be measured according to the inter-contact point resistance value Rb, the circuit resistance value Rc, and each electrode current. It is possible to realize measurement with high measurement accuracy in consideration of the flowing leakage current.

C. Measurement method in the second embodiment of the present invention:
In the measurement method in the second embodiment, the hardware of the current distribution measuring apparatus 100 is configured so that the circuit resistance value Rc / contact point resistance value Rb is sufficiently small, and the measured values i3 and i4 are output to the output current value i1. , I2 is measured and current distribution is measured.

This measurement method is a highly practical measurement method realized by the inventor paying attention to the fact that the second term of the seventh and eighth equations can be adjusted by the hardware configuration of the current distribution measuring device 100. . (1) Formula 7: i1 = i3 + Rc / Rb (i3-i4)
(2) Eighth Formula: i2 = i4 + Rc / Rb (−i3 + i4)
According to this method, since the measurement error due to the leakage current flowing between the plurality of electrodes can be set within a permissible range assumed in advance with a simple configuration, measurement can be performed while avoiding the complicated analysis described above. Reliability can be increased.

For example, when the allowable error Er is defined as current value i5 / current value i2 (FIG. 5) and the maximum value of the current output ratio at each measurement point is assumed to be the maximum output ratio Pr, the first to sixth expressions It is understood that the hardware of the current distribution measuring apparatus 100 may be configured to satisfy the following ninth equation by solving the simultaneous equations.
Nineth formula: allowable error Er> absolute value (1-((maximum output ratio Pr + 1) × circuit resistance value Rc + contact point resistance value Rb) / (2 × circuit resistance value Rc + contact point resistance value Rb)). However, the absolute value means a function that returns an absolute value.

  Such a hardware configuration can be realized by at least one of “increasing resistance value Rb between contact points” and “decreasing circuit resistance value Rc”. “Increase in resistance value Rb between contact points” can be realized by, for example, increasing the resistance value of a measurement object or a measurement jig having contact points or increasing the pitch between contact points. On the other hand, the “decrease in the circuit resistance value Rc” can be realized, for example, by eliminating contact resistance by integrating circuits of a measuring device described later, or by reducing contact resistance by applying liquid metal to the contact surface.

  Specifically, the “decrease in the circuit resistance value Rc” can be reduced by applying a predetermined metal between the current collecting electrode 125 and the separator 204. Examples of metals that can be applied include ductile metals such as indium and lead, and liquid metals such as gallium-indium alloys, mercury, and sodium. From the viewpoint of reducing contact resistance, a liquid metal is preferable, and from the viewpoint of safety, an alloy containing gallium and indium such as a gallium-indium alloy is preferable. The “decrease in circuit resistance value Rc” means that a plurality of measurement electrodes 120 and a current collecting plate 111 are integrated to form an integrated measurement electrode 120a (FIG. 6), and the contact resistance between them. The circuit resistance value Rc can also be reduced by eliminating.

  For example, the circuit resistance value Rc is measured by the contact resistance between the collecting electrode 125 and the separator 204 and the contact between the measuring electrode 120 and the current collecting plate 111. You may make it consider that it is the combined resistance of resistance. This is because most of the circuit resistance value Rc is occupied by the contact resistance. However, when the measurement electrode 120 and the current collecting plate 111 are integrally configured, the circuit resistance value Rc can be regarded as a contact resistance between the current collecting electrode 125 and the separator 204.

  On the other hand, the “increase in the resistance value Rb between contact points” is a method of using a separator 204 having a large resistance material or a plate having a large resistance value such as a carbon plate between the separator 204 and the collector electrode 125 as a measurement jig. And a configuration in a fourth modification described later can be realized.

  Furthermore, as a simple configuration, if the hardware is configured so that the circuit resistance value Rc is 1/5 or less of the inter-contact point resistance value Rb, current density distribution measurement can generally be performed with sufficient accuracy. The inventor has derived this from many actual measurement examples.

  As described above, in this embodiment, the leakage current can be reduced by the hardware configuration of the current distribution measuring apparatus 100, so that it is possible to easily measure the current density distribution by eliminating complicated analysis on the leakage current. There is an advantage.

D. Variations:
As mentioned above, although several embodiment of this invention was described, this invention is not limited to such embodiment at all, and implementation in various aspects is possible within the range which does not deviate from the summary. It is. For example, the following modifications are possible.

D-1. In the above embodiment, the current sensor 126 is arranged at the same position in the axial direction of the measurement electrode 120. For example, the current sensor 126 is shifted in the axial direction of the measurement electrode 120 as shown in FIG. Accordingly, the pitch of the measurement electrodes 120 may be configured to be smaller than the size of the current sensor 126 in the direction perpendicular to the measurement electrodes 120. In this way, it is possible to increase the density of measurement points while ensuring the sensor size and maintaining the sensing accuracy.

D-2. In the above embodiment, the current collecting plate 111 presses the plurality of measurement electrodes 120 against the fuel cell 201 (FIG. 1) as the measurement object. For example, as shown in FIG. May be provided with a pressure plate 130 that is pressed against the object to be measured. By so doing, it is possible to suppress variations in the pressing pressure for each measuring electrode 120 caused by manufacturing tolerances of the lengths of the plurality of measuring electrodes 120.

  Note that the pressure plate 130 only needs to be configured to have sufficiently higher rigidity in the surface pressure direction than the current collecting plate 111a. When the pressure plate 130 is formed of a conductor, the pressure plate 130 is provided between the current collecting electrodes 125. In order to prevent a short circuit, an insulator 130n may be provided between the collector electrode 125 and the collector electrode 125.

  For example, as shown in FIG. 9, a spring 125 s for biasing may be provided between the pressure plate 130 and the current collecting electrode 125. By so doing, it is possible to further suppress variation in contact resistance between the battery electrode and the reaction gas flow path, and to improve measurement accuracy.

D-3. In the above embodiment, the front surface of the contact surface of the current collecting electrode 125 is configured to be conductive, but may be configured as shown in FIG. 10, for example. FIG. 10 is an explanatory diagram showing a contact surface of the collecting electrode 125. The contact surface has an insulating region 125n (hatched region) provided with an enamel coating for insulation and a conductive region 125c capable of conducting. Liquid metal is applied to the conduction region 125c. The insulating region 125n is configured as a closed region surrounding the conductive region 125c.

  In this configuration, the leakage current of the path as shown in FIG. 11 can be prevented, so that the contact point resistance as shown in FIG. 12 is reduced while reducing the contact point interval in order to equalize the pressing pressure. The value Rb can be increased.

D-4. In the above embodiment, the current density distribution output from one cell of the fuel cell 201 is measured from one side. For example, as shown in FIG. 13, the measurement electrode 120 is sandwiched between the fuel cell stacks. You may do it. Note that the present invention can be realized in a current distribution measuring method, a device such as a fuel cell equipped with the current distribution measuring device, and other various aspects.

D-5. In the above embodiment, the current density distribution of the fuel cell is measured, but the present invention can be applied not only to the fuel cell but also to other measurement objects.

1 is a schematic configuration diagram of a current distribution measuring device 100 and a measurement target in a first embodiment of the present invention. The enlarged view of the several electrode 120 for a measurement which measures the electric current value output from each part of the separator 204. FIG. Explanatory drawing which shows the array state on the separator 204 of the current collection electrode 125 in 1st Example of this invention. An equivalent circuit of an electric circuit composed of the current distribution measuring device 100 and the fuel cell 201 to be measured. Explanatory drawing which shows a part of equivalent circuit. Explanatory drawing which shows the integrated measurement electrode 120a by which the current collection board 111 was integrated with the several electrode 120 for measurement. Explanatory drawing which shows the some electrode 120 for a measurement in a 1st modification. The schematic block diagram of the current distribution measuring device 100 in a 2nd modification, and a measuring object. The schematic block diagram of the current distribution measuring device 100 in a 3rd modification, and a measuring object. The schematic block diagram of the current distribution measuring device 100 in a 4th modification, and a measuring object. Explanatory drawing which shows the leakage current suppressed by the 4th modification. Explanatory drawing which shows a mode that the leakage current was suppressed in the 4th modification. FIG. 10 is a schematic configuration diagram of a current distribution measuring device 100 and a measurement target in a fifth modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Current distribution measuring device 107 ... Terminal plate 109 ... End plate 110 ... Load 111, 111a ... Current collecting plate 120 ... Measuring electrode 124, 125 ... Current collecting electrode 125s ... Spring 126 ... Current sensor 128 ... Rod 130 ... Pressure plate 130a ... insulator 201 ... fuel cell 202 ... membrane electrode assembly 203, 204 ... separator

Claims (12)

A measuring device that measures a current density distribution of a measurement target that supplies power to a load ,
A current collecting plate;
Provided in the current collection plate, a plurality of contact points of the measurement object, and a plurality of electrodes which causes conduction between the current collection plate and the contact point by contacting the measurement object,
A plurality of sensors provided on each of the plurality of electrodes and measuring an electrode current flowing through each of the plurality of electrodes;
With
The measuring device includes a circuit that is the measurement object, a resistance value Rb between contact points that is a resistance value between the plurality of contact points in the measurement object, and a resistance value between each contact point and the current collecting plate. Using an equivalent circuit of an electric circuit composed of a resistance value Rc and the load, the relationship between the equivalent circuits including the contact points of the electrodes among the plurality of electrodes is two-dimensionally modeled. Applying the measured electrode currents to the circuit equations according to Kirchhoff's law for the two-dimensionally modeled equivalent circuits to obtain the current density distribution of the measurement object. A measuring device. The measuring device according to claim 1,
The measuring device, the plurality of above the maximum value of the measured current output ratio is assumed as the maximum output ratio Pr between the contact points, when the error allowed and Er, said to satisfy the following equation A circuit resistance value Rc and a resistance value Rb between the contact points are configured, and each electrode current measured by the plurality of electrodes is output at a contact point where the electrodes are in contact with each other. A measuring device configured to be considered.
The allowable error Er> absolute value (1-((the maximum output ratio Pr + 1) × the circuit resistance value Rc + the resistance value Rb between the contact points) / (2 × the circuit resistance value Rc + the resistance value between the contact points Rb))
However, the absolute value means a function that returns an absolute value. The measuring device according to claim 1,
The circuit resistance value Rc is configured to be 1/5 or less of the resistance value Rb between the contact points,
The measurement apparatus is configured to regard each electrode current measured by the plurality of electrodes as a current output at a contact point where the electrodes are in contact with each other. A measuring device according to any one of claims 1 to 3,
The circuit resistance value Rc is regarded as a combined resistance of a contact resistance between each contact point to be measured and the electrode and a contact resistance between the electrode and the current collecting plate. A measuring device that measures density distribution. A measuring device according to any one of claims 1 to 4,
The plurality of electrodes and the current collecting plate are configured as a single unit,
The circuit resistance value Rc is a measuring device that measures the current density distribution by regarding the circuit resistance value Rc as a contact resistance between each contact point to be measured and the electrode. A measuring device according to any one of claims 1 to 5,
A measuring apparatus configured to reduce contact resistance between each of the plurality of electrodes and the measurement object by applying a liquid metal between each of the plurality of electrodes and the measurement object. . The measuring device according to claim 6,
The liquid metal is a measuring device that is an alloy containing gallium and indium. The measuring device according to any one of claims 1 to 7,
The measurement object is a battery electrode of a fuel cell provided with a reaction gas channel,
The measuring apparatus is configured such that a distance between each contact surface between each of the plurality of electrodes and the measurement target is equal to or less than twice a pitch in a width direction of the reaction gas flow path. A measuring device according to any one of claims 1 to 8,
By shifting the sensor relative to each other in the axial direction of the plurality of electrodes, the pitch between the plurality of electrodes is configured to be smaller than the size in the direction perpendicular to the axis of the plurality of electrodes of the sensor. , Measuring device. The measuring device according to any one of claims 1 to 9,
The measurement object is a battery electrode of a fuel cell provided with a reaction gas channel,
The plurality of electrodes are:
An electrode rod for guiding current to the current collecting plate ;
At each contact point of the measurement object, a contact terminal for contacting in an area wider than the cross-sectional area of the electrode rod,
With
The measurement apparatus further includes a pressure plate that presses each of the contact terminals together with the measurement target. The measurement device according to claim 10, further comprising:
A measuring device comprising an urging portion between each of the pressure plate and the contact terminal. 12. The measuring device according to claim 1, further comprising:
The plurality of electrodes have a contact surface including a central region capable of conducting by contact and a closed peripheral region surrounding the central region,
The measuring device, wherein the peripheral region is insulated.

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