JP6163933B2 - Deriving device for deriving each resistance value of a solid oxide fuel cell single cell - Google Patents

Description

The present invention relates to electrical output device you derive the resistance value of the solid oxide fuel cell single cell.

  As one type of derivation method and derivation device for deriving each resistance value relating to a solid oxide fuel cell single cell, one disclosed in Patent Document 1 is known. As shown in FIG. 4 of Patent Document 1, the resistor is electrically connected to the first resistor portions 121 and 126a electrically connected to the first electrode 111 side and to the second electrode 141 side. Second resistance parts 131 and 126b. The first resistance parts 121 and 126a and the second resistance parts 131 and 126b are connected to the first resistance parts 121 and 126a in the current flow direction and the second resistance parts 131 and 126b. The current flow directions at 126b are parallel to each other and opposite to each other. As a result, the first resistor 121, 126a and the second resistor 131, 126b have opposite current flow directions, so that the magnetic fields created by the respective currents can be made to cancel each other. The influence of the inductance of the resistor due to the high frequency current can be reduced. As a result, the measurement accuracy of the current measuring device can be improved.

JP 2010-103071 A

  In the derivation method and derivation device for deriving each resistance value relating to the solid oxide fuel cell unit cell described in Patent Document 1 described above, the measurement accuracy of the internal resistance of the solid oxide fuel cell unit cell is improved. However, out of the total resistance of a solid oxide fuel cell unit cell, the resistance value of ohmic resistance and the electrode reaction resistance values of the fuel electrode and oxidant electrode are separated to improve the measurement accuracy of each resistance component There is a request to do.

The present invention has been made to solve the respective problems described above, the conductive sensing device you derive the resistance value of the solid oxide fuel cell single cell, all of the solid oxide fuel cell single cell An object of the present invention is to improve the measurement accuracy of the resistance value of the ohmic resistance and the electrode reaction resistance values of the fuel electrode and the oxidant electrode.

In order to solve the above-mentioned problem, the invention of the deriving device for deriving each resistance value relating to the single cell of the solid oxide fuel cell according to claim 1 takes out the current while holding the single cell of the solid oxide fuel cell. An impedance measuring instrument connected to a solid oxide fuel cell unit cell held by a holding current collector via a potential cable and a current cable each twisted with a pair of wires, and an impedance measured by the impedance measuring instrument A deriving unit for deriving the electrode reaction resistance value and the ohmic resistance value of the fuel electrode and the oxidant electrode of the solid oxide fuel cell single cell from the real component and the imaginary number component is provided.
The holding current collector is disposed in a heat insulating tube formed of a heat insulating material in a cylindrical and airtight manner, and is formed in a cylindrical shape to hold the solid oxide fuel cell single cell from the fuel electrode side. A first holder tube, a second holder tube formed in a cylindrical shape to hold the solid oxide fuel cell single cell from the oxidant electrode side, and one of the electric potential cable and the current cable are connected to the fuel electrode. The first electrode body that is in contact with the other electrode of the potential cable and the current cable is connected, the second electrode body that is in contact with the oxidizer electrode, the first electrode body is disposed in the first holder tube, is formed in a cylindrical shape, and is a fuel electrode A first gas introduction pipe that supplies fuel gas to the first gas pipe, a second gas introduction pipe that is disposed in the second holder pipe, is formed in a cylindrical shape, and supplies the oxidant gas to the oxidant electrode; It is arranged between solid oxide fuel cell single cells and formed into a cylindrical shape. And is disposed between the first cable outlet pipe having a cutout portion into which one of the electric wires of the potential cable and the current cable is inserted, the second holder pipe, and the solid oxide fuel cell single cell, and is tubular. And a second cable outlet pipe having a cutout portion into which the other electric wire of the potential cable and the current cable is inserted.

According to this, since the potential cable and the current cable are twisted, the inductance of these cables can be suppressed small. Therefore, it is possible to accurately measure each electrode reaction resistance value and ohmic resistance resistance value of the fuel electrode and the oxidant electrode of the solid oxide fuel cell single cell without being affected by the inductance of the cable. Accuracy can be improved.
In addition, since each cable will be pulled out from the notch of each cable outlet tube, without damaging each cable such as being sandwiched between each holder tube and a solid oxide fuel cell single cell, Each cable can be pulled out from the holding current collector with a simple configuration. Further, by arranging each cable at a predetermined position, it can be reliably separated from the other (the other cable, a solid oxide fuel cell single cell to be measured, etc.), and measurement errors can be suppressed. it can.

The invention according to claim 2, in the derivation device for deriving the resistance values of the solid oxide fuel cell unit according to claim 1, deriving unit, the real and imaginary components of the impedance call - the call plot When the Cole-Cole plot display section shown and the relationship between the real component and the imaginary component of the impedance indicated by the Cole-Cole plot display section are two semicircular shapes projecting upward, the imaginary axis Ohmic resistance value deriving unit that derives the value at which the left end of the semicircular part on the near side intersects the real axis as the resistance value of the ohmic resistance, and the size of the part where the semicircular part near the imaginary axis intersects the real axis A value corresponding to the size of the part where the semicircular part far from the imaginary axis intersects the real axis, Oxidizer electrode It includes an oxidant electrode reaction resistance value deriving unit that derives a response resistance value.
According to this, each electrode reaction resistance value of the fuel electrode and the oxidant electrode of the solid oxide fuel cell single cell and the resistance value of the ohmic resistance can be measured easily and accurately.

According to a third aspect of the present invention, there is provided a deriving device for deriving each resistance value of the solid oxide fuel cell unit cell according to the first or second aspect , wherein the solid oxide fuel cell unit cell and the first cable take-out are provided. Between the pipe, between the first cable outlet pipe and the first holder pipe, between the solid oxide fuel cell unit cell and the second cable outlet pipe, and between the second cable outlet pipe and the second holder pipe. The space is sealed by a sealing tube formed in a cylindrical shape with a glass material.

  According to this, when measuring the solid oxide fuel cell single cell held by the holding current collector, the holding current collector is arranged in a heat insulating tube at a very high temperature (for example, 600 to 1000 ° C.). However, since it is sealed by the seal tube, gas leakage can be effectively suppressed even in a high temperature environment.

It is the schematic which showed the derivation | leading-out apparatus which derives | leads-out each resistance value concerning the solid oxide fuel cell single cell by one Embodiment of this invention. FIG. 2 is a partial enlarged cross-sectional view showing a solid oxide fuel cell single cell housed in the heating device shown in FIG. 1 and held by a holding current collector. It is a block block diagram of the control apparatus shown in FIG. It is a figure which shows the measurement circuit of the derivation | leading-out apparatus shown in FIG. It is the figure which carried out the Cole-Cole plot of the measurement result of AC impedance measurement.

  Hereinafter, an embodiment of a deriving method and deriving device for deriving each resistance value of a solid oxide fuel cell unit cell according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of the derivation device, and FIG. 2 is a solid oxide fuel cell single cell (hereinafter referred to as a single cell) housed in a heating device 11 and held by a holding current collector 12. FIG.

  A deriving device (hereinafter referred to as deriving device) 10 for deriving each resistance value related to the single cell 20 includes a heating device 11 and a holding current collector that is disposed in the heating device 11 and holds the single cell 20 to extract current. An apparatus 12, an impedance measuring device 13 that measures the impedance of the single cell 20, and a control device 14 are provided.

  The heating device 11 includes a casing 11a (heat insulating pipe) and a heat source 11b that are formed of a heat insulating material in a cylindrical shape. The casing 11a has a structure that allows the single cell 20 to be inspected to enter and exit. For example, the casing 11a is divided into two in the vertical direction and is configured to be opened and closed. The heat source 11b is an electric heater or a gas burner.

  As shown in FIG. 2, the single cell 20 includes a fuel electrode 21, an air electrode 22 (oxidant electrode), and an electrolyte 23 interposed between the two electrodes. The fuel cell of the present embodiment is a solid oxide fuel cell, and uses zirconium oxide, which is a kind of solid oxide, as an electrolyte. Hydrogen gas as fuel gas is supplied to the fuel electrode 21 of the single cell 20. Air that is an oxidizing gas for combustion is supplied to the air electrode 22 side of the single cell 20. In FIG. 2, the single cell 20 is schematically shown. The measurement object may be configured by stacking a plurality of cells instead of the single cell 20.

The holding current collector 12 is disposed in the casing 11a as shown in FIG. As shown in FIG. 2, the holding current collector 12 includes first and second holder tubes 12a and 12b, first and second cable outlet tubes 12c and 12d, first to fourth seal tubes 12e to 12h, and The first and second electrode bodies 12i and 12j and the first and second gas introduction pipes 12k and 12l are provided.
The first holder tube 12a is formed in a cylindrical shape and holds the single cell 20 from the fuel electrode 21 side. The second holder tube 12b is formed in a cylindrical shape and holds the single cell 20 from the air electrode 22 side.

  The first cable extraction pipe 12 c is formed in a cylindrical shape and is disposed between the first holder pipe 12 a and the single cell 20. The first cable extraction pipe 12c includes notches 12c1 and 12c2 into which one electric wire 13c1 of the potential cable 13c and one electric wire 13d1 of the current cable 13d are respectively inserted. The cutout portion 12c1 into which the electric wire 13c1 is inserted and the cutout portion 12c2 into which the electric wire 13d1 is inserted are filled with a heat-resistant sealing material (for example, heat-resistant glass).

  The second cable extraction pipe 12 d is formed in a cylindrical shape and is disposed between the second holder pipe 12 b and the single cell 20. The second cable extraction pipe 12d includes notches 12d1 and 12d2 into which the other electric wire 13c2 of the potential cable 13c and the other electric wire 13d2 of the current cable 13d are respectively inserted. The cutout portion 12d1 into which the electric wire 13c2 is inserted and the cutout portion 12d2 into which the electric wire 13d2 is inserted are filled with a heat-resistant sealing material (for example, heat-resistant glass).

  The 1st seal pipe | tube 12e is arrange | positioned between the fuel electrode 21 of the single cell 20, and the 1st cable extraction pipe | tube 12c, and is formed in the cylinder shape with the glass material. A space between the fuel electrode 21 of the single cell 20 and the first cable extraction pipe 12c is sealed by a first seal pipe 12e. The second seal tube 12f is disposed between the first cable extraction tube 12c and the first holder tube 12a, and is formed of a glass material into a cylindrical shape. A space between the first cable extraction pipe 12c and the first holder pipe 12a is sealed by a second seal pipe 12f.

  The third seal tube 12g is disposed between the air electrode 22 of the single cell 20 and the second cable extraction tube 12d, and is formed of a glass material into a cylindrical shape. A space between the air electrode 22 of the single cell 20 and the second cable extraction pipe 12d is sealed by a third seal pipe 12g. The fourth seal tube 12h is disposed between the second cable extraction tube 12d and the second holder tube 12b, and is formed of a glass material into a cylindrical shape. A space between the second cable extraction pipe 12d and the second holder pipe 12b is sealed by a fourth seal pipe 12h.

  The first holder pipe 12a, the first cable outlet pipe 12c, and the first and second seal pipes 12e and 12f bias the fuel electrode 21 of the single cell 20 from the fuel electrode 21 side by biasing means (for example, a compression spring). To hold. Further, the second holder tube 12b, the second cable extraction tube 12d, and the third and fourth seal tubes 12g and 12h are configured to bias the air electrode 22 of the single cell 20 from the air electrode 22 side by means of urging means (for example, a compression spring). Energize and hold.

  The first holder tube 12a, the first cable outlet tube 12c, and the first and second seal tubes 12e and 12f are preferably configured to have the same inner diameter and are disposed coaxially. These tubes are preferably set smaller than the outer diameter (outer frame) of the fuel electrode 21 of the single cell 20. The second holder tube 12b, the second cable outlet tube 12d, and the third and fourth seal tubes 12g and 12h are preferably configured to have the same inner diameter and are disposed coaxially. These tubes are preferably set smaller than the outer diameter (outer frame) of the air electrode 22 of the single cell 20. Further, it is preferable that the first holder tube 12a side tube and the second holder tube 12b side tube have the same inner diameter.

  The first electrode body 12i is connected to one electric wire 13c1 of the potential cable 13c and one electric wire 13d1 of the current cable 13d, and contacts the fuel electrode 21 to extract current. The first electrode body 12i is preferably configured in a mesh shape with a metal material (for example, platinum mesh).

  The second electrode body 12j is connected to the other electric wire 13c2 of the potential cable 13c and the other electric wire 13d2 of the current cable 13d, and contacts the air electrode 22 to extract current. The second electrode body 12j is also preferably configured in a mesh shape with a metal material (for example, platinum mesh).

  The first gas introduction pipe 12k is disposed in the first holder pipe 12a, is formed in a cylindrical shape, and supplies fuel gas to the fuel electrode 21. One end (upper end) of the first gas introduction pipe 12k is in contact with the first electrode body 12i. Fuel gas is supplied into the first gas introduction pipe 12k from the other end side of the first gas introduction pipe 12k, passes through the first electrode body 12i, and between the first gas introduction pipe 12k and the first holder pipe 12a. It is derived as fuel off-gas through. The first gas introduction pipe 12k is preferably set smaller than the outer diameter (outer frame) of the first electrode body 12i.

  The second gas introduction pipe 12 l is disposed in the second holder pipe 12 b and is formed in a cylindrical shape to supply air to the air electrode 22. One end (lower end) of the second gas introduction pipe 12l is in contact with the second electrode body 12j. Air is supplied into the second gas introduction pipe 12l from the other end side of the second gas introduction pipe 12l, passes through the second electrode body 12j, and passes between the second gas introduction pipe 12l and the second holder pipe 12b. Thus, it is derived as air off-gas. The second gas introduction pipe 121 is preferably set smaller than the outer diameter (outer frame) of the second electrode body 12j.

  As shown in FIG. 1, the impedance measuring instrument 13 includes a potentiostat 13a and a frequency response analyzer 13b. The potentiostat 13a is a device for measuring and controlling a voltage, and is a device for measuring and controlling a current. The potentiostat 13a is connected to one end of a potential cable 13c including a pair of electric wires 13c1 and 13c2, and the other end sides of the pair of electric wires 13c1 and 13c2 are connected to the first electrode body 12i and the second electrode body 12j, respectively. ing. The pair of electric wires 13c1 and 13c2 are twisted (twisted).

  The potentiostat 13a is connected to one end of a current cable 13d composed of a pair of electric wires 13d1 and 13d2, and the other end sides of the pair of electric wires 13d1 and 13d2 are connected to the first electrode body 12i and the second electrode body 12j, respectively. It is connected. The pair of electric wires 13d1, 13d2 are twisted (twisted).

  The frequency response analyzer 13b applies an AC signal to the single cell 20 via the potentiostat 13a, and calculates (measures) the AC impedance from the voltage / current signal output from the potentiostat 13a.

  The potentiostat 13 a and the frequency response analyzer 13 b are connected to the control device 14 and controlled by the control device 14. As shown in FIG. 3, the control device 14 determines each electrode reaction resistance value of the fuel electrode 21 and the air electrode 22 of the single cell 20 and the ohmic resistance R1 from the real component and the imaginary component of the impedance measured by the impedance measuring device 13. The derivation | leading-out part 14a which derives | leads-out the resistance value of is provided. The ohmic resistance R1 is mainly a pure resistance due to a membrane resistance of the fuel cell or an electrolyte.

  The derivation unit 14a has a Cole-Cole plot display unit 14b that shows a real component and an imaginary component of impedance in a Cole-Cole plot, and a relationship between the real component of the impedance and the imaginary component shown by the Cole-Cole plot display unit 14b. In the case of two semicircular shapes projecting upward, an ohmic resistance value deriving unit for deriving a value at which the left end of the semicircular portion near the imaginary axis intersects the real axis as the resistance value of the ohmic resistance R1 14c, a fuel electrode reaction resistance value deriving unit 14d for deriving a value corresponding to the size of a portion where the semicircle portion closer to the imaginary axis intersects the real axis as an electrode reaction resistance value of the fuel electrode 21, and an imaginary number An oxidant electrode reaction resistance value deriving unit 14e for deriving a value corresponding to the size of the portion where the semicircular portion far from the axis intersects the real axis as the electrode reaction resistance value of the air electrode 22; There.

  In order to measure each resistance value of the fuel electrode 21, the air electrode 22, and the ohmic resistance R1 of the single cell 20, AC impedance measurement is performed. In this AC impedance measurement, the current is measured by changing the frequency under a constant voltage, and the impedance is calculated from the measurement result.

  As shown in FIG. 4, in the measurement circuit, the inductance L of the current cable 13d, the ohmic resistance R1, the resistance component R2 and the capacitor component C2 of the fuel electrode 21, and the resistance component R3 and the capacitor component C3 of the air electrode 22 are connected in series. Has been. The resistance component R2 and the capacitor component C2 of the fuel electrode 21 are connected in parallel, and the resistance component R3 and the capacitor component C3 of the air electrode 22 are connected in parallel.

  In this embodiment, since the pair of electric wires 13d1, 13d2 of the current cable 13d is twisted, the inductance L of the current cable 13d is almost zero. Therefore, in the measurement circuit, the ohmic resistance R1, the resistance component R2 and the capacitor component C2 of the fuel electrode 21, and the resistance component R3 and the capacitor component C3 of the air electrode 22 are connected in series.

  Next, an AC impedance measurement result will be described with reference to FIG. The measurement conditions are: the power generation temperature of the fuel cell is 700 ° C. (the power generation temperature is not limited to this), the oxidant gas is air, the fuel gas is 3 vol% hydrogen gas or methane reformed gas, and AC impedance is applied. The frequency is 1 MHz to 0.1 Hz, and the AC impedance amplitude is 10 mV.

  A measurement result according to the measurement method according to the present embodiment (the current cable 13d is twisted) is indicated by a solid line, and a comparative example in which the current cable 13d is not twisted is indicated by a broken line.

  The measurement result of the example is composed of two semicircular portions A1 and A2 protruding upward in which the relationship between the real component and the imaginary component of the impedance is continuous. Further, a value Rre1 at which the left end of the semicircular portion A1 closer to the imaginary axis intersects the real axis is derived as the resistance value of the ohmic resistor R1 (ohmic resistance value deriving unit 14c). Further, a value (= Rre2-Rre1) corresponding to the size of the portion where the semicircular portion A1 closer to the imaginary axis intersects the real axis is derived as the electrode reaction resistance value R2 of the fuel electrode 21 (fuel electrode). Reaction resistance value deriving unit 14d). Further, a value (= Rre3-Rre2) corresponding to the size of the portion where the semicircle portion A2 far from the imaginary axis intersects the real axis is derived as the electrode reaction resistance value R3 of the air electrode 22 (oxidant). Polar reaction resistance deriving unit 14e). Further, a value Rre3 at which the semicircular portion A2 far from the imaginary axis intersects the real axis is derived as the total resistance value of the single cell 20. However, the relationship between A1 and A2 is not limited.

  A value (= Rre2−Rre1) corresponding to the size of the portion where the semicircular portion A1 closer to the imaginary axis intersects the real axis is the electrode reaction resistance value R2 of the fuel electrode 21 and is closer to the imaginary axis. The inventor of the present application has found through experiments that the value (= Rre3-Rre2) corresponding to the size of the portion where the semicircular portion A2 intersects the real axis is the electrode reaction resistance value R3 of the air electrode 22.

  On the other hand, the measurement result (broken line) of the comparative example is one semicircle portion A3, and the value Rre4 at which the left end of the semicircle portion A3 intersects the real axis is derived as the resistance value R1a of the ohmic resistor R1. Will be. Since the resistance value Rre4 includes the inductance L of the current cable 13d, the resistance value of the ohmic resistor R1 becomes a resistance value R1a that is larger than the actual resistance value of the ohmic resistor R1. The reason why the inductance L is relatively large instead of 0 is that the current cable 13d is not twisted, so that the phase angle deviation between the voltage and current occurs and deviates from the true value. In the comparative example, only one semicircle portion appears. This is also because it is affected by the inductance L of the current cable 13d.

  According to the present embodiment, the derivation method for deriving each resistance value related to the single cell 20 includes a pair of electric wires in the single cell 20 held by the holding current collector 12 that holds the single cell 20 and extracts current. The fuel electrode 21 and air of the single cell 20 from the real component and the imaginary component of the impedance measured by the impedance measuring instrument 13 connected via the potential cable 13c and the current cable 13d twisted by 13c1, 13c2, 13d1, 13d2 The electrode reaction resistance value of the electrode 22 (oxidant electrode) and the resistance value of the ohmic resistance (for example, the ohmic resistance R1) are derived.

  According to this, since the potential cable 13c and the current cable 13d are twisted, the inductance of these cables can be suppressed small. Accordingly, the resistance value of the ohmic resistance R1 of the single cell 20 and the electrode reaction resistance values of the fuel electrode 21 and the air electrode 22 can be accurately measured without being affected by the inductance of the cable. The separation measurement accuracy can be improved for each resistance value.

In the derivation method for deriving each resistance value related to the single cell 20 according to the present embodiment, the real component and the imaginary component of the impedance are shown in the Cole-Cole plot, and the real component of the impedance shown in the Cole-Cole plot is shown. And the imaginary component are two semicircular shapes A1 and A2 projecting upward in succession, and can be defined as follows, for example, by an equivalent circuit shown in FIG. The resistance value of the ohmic resistor R1 is a value Rre1 at which the left end of the semicircle portion A1 on the side close to the imaginary axis intersects the real axis, and the electrode reaction resistance value R2 of the fuel electrode 21 is a semicircle on the side close to the imaginary axis. The portion A1 is a value corresponding to the size of the portion that intersects the real axis (= Rre2-Rre1), and the electrode reaction resistance value R3 of the air electrode 22 is the semicircular portion A2 far from the imaginary axis. It is a value (= Rre3-Rre2) corresponding to the size of the intersecting portion. In addition, the circular arc regarding the electrode reaction resistance value of a fuel electrode and an oxidizer electrode may change the definition of a semicircle with the fuel cell single cell structure.
According to this, it is possible to easily and accurately measure the electrode reaction resistance values of the fuel electrode 21 and the air electrode 22 of the single cell 20 and the resistance value of the ohmic resistance R1.

  The deriving device for deriving each resistance value related to the single cell 20 according to the present embodiment has a pair of electric wires 13c1 in the single cell 20 held by the holding current collector 12 that holds the single cell 20 and extracts current. , 13c2, 13d1, 13d2 of the single cell 20 from the impedance measuring device 13 connected via the twisted potential cable 13c and the current cable 13d, and the real and imaginary components of the impedance measured by the impedance measuring device 13. And a derivation unit 14a for deriving each electrode reaction resistance value of the fuel electrode 21 and the air electrode 22 and a resistance value of ohmic resistance.

  According to this, since the potential cable 13c and the current cable 13d are twisted, the inductance of these cables can be suppressed small. Therefore, each electrode reaction resistance value of the fuel electrode 21 and the air electrode 22 of the single cell 20 and the resistance value of the ohmic resistance R1 can be accurately measured without being affected by the inductance of the cable, that is, the measurement accuracy is improved. Can be made.

In the derivation device for deriving each resistance value related to the single cell 20 according to the present embodiment, the derivation unit 14a includes a call-call plot display unit 14b that displays a real component and an imaginary component of impedance in a Cole-Cole plot, When the relationship between the real component and the imaginary component of the impedance indicated by the Cole plot display unit 14b is two semicircular shapes A1 and A2 that are continuously projected upward, the semicircular portion closer to the imaginary axis The ohmic resistance value deriving portion 14c for deriving the value Rre1 at which the left end of A1 intersects the real axis as the resistance value of the ohmic resistance R1, and the size of the portion where the semicircular portion A1 closer to the imaginary axis intersects the real axis A fuel electrode reaction resistance value deriving unit 14d for deriving a corresponding value (= Rre2-Rre1) as an electrode reaction resistance value R2 of the fuel electrode 21, and a semicircular portion on the side far from the imaginary axis An oxidant electrode reaction resistance value deriving unit 14e for deriving a value (= Rre3-Rre2) corresponding to the size of the portion where A2 intersects the real axis as the electrode reaction resistance value R3 of the air electrode 22. .
According to this, it is possible to easily and accurately measure the electrode reaction resistance values of the fuel electrode 21 and the air electrode 22 of the single cell 20 and the resistance value of the ohmic resistance R1.

  In the derivation device for deriving each resistance value related to the single cell 20 according to the present embodiment, the holding current collector 12 is disposed in a casing 11a (heat insulation pipe) that is formed of a heat insulating material in a cylindrical shape. The first holder tube 12a is formed in a cylindrical shape and holds the single cell 20 from the fuel electrode 21 side, and the second holder tube 12b is formed in a cylindrical shape and holds the single cell 20 from the air electrode 22 side. The electric wires 13c1 and 13d1 on one side of the potential cable 13c and the current cable 13d are connected, and the first electrode body 12i that contacts the fuel electrode 21 and the other electric wires 13c2 and 13d2 on the other side of the potential cable 13c and the current cable 13d are connected. A second electrode body 12j that is connected and is in contact with the air electrode 22, and a first gas introduction that is disposed in the first holder tube 12a and that is formed in a cylindrical shape and supplies fuel gas to the fuel electrode 21. 12k, a second gas introduction pipe 12l which is disposed in the second holder pipe 12b, is formed in a cylindrical shape and supplies an oxidant gas to the air electrode 22, and a gap between the first holder pipe 12a and the single cell 20. A first cable outlet pipe 12c having a notch 12c1, 12c2 into which one of the electric wires 13c1, 13d1 of the potential cable 13c and the current cable 13d is inserted, and a second holder. A second portion that is disposed between the tube 12b and the single cell 20 and has a cutout portion 12d1 and 12d2 into which the other electric wires 13c2 and 13d2 of the potential cable 13c and the current cable 13d are inserted, respectively. A cable outlet pipe 12d.

  According to this, since each cable 13c, 13d will be pulled out from notch part 12c1, 12c2, 12d1, 12d2 of each cable extraction pipe | tube 12c, 12d, between each holder pipe | tube 12a, 12b and the single cell 20 The cables 13c and 13d can be pulled out from the holding current collector 12 with a simple configuration without being damaged by being caught between the cables. Further, by disposing each cable 13c, 13d at a predetermined position, it can be surely separated from the other (the other cable, the fuel cell to be measured, etc.), and measurement errors can be suppressed.

  In the derivation device for deriving each resistance value related to the single cell 20 according to this embodiment, between the single cell 20 and the first cable extraction pipe 12c, between the first cable extraction pipe 12c and the first holder pipe 12a. The space between the single cell 20 and the second cable outlet pipe 12d and the gap between the second cable outlet pipe 12d and the second holder pipe 12b are formed in a cylindrical shape with a glass material or a heat-resistant and highly rigid plastic material. Each seal tube 12e-12h is sealed.

  According to this, when measuring the single cell 20 held by the holding current collector 12, the holding current collector 12 is arranged in a casing 11 a (insulated pipe) at a very high temperature (for example, 600 to 1000 ° C.). Although it is provided, since it is sealed by the seal pipes 12e to 12h, gas leakage can be effectively suppressed even in a high temperature environment.

  DESCRIPTION OF SYMBOLS 10 ... Deriving device, 11 ... Heating device, 11a ... Casing (insulation tube), 11b ... Heat source, 12 ... Holding current collecting device, 12a, 12b ... First and second holder tubes, 12c, 12d ... First and second Cable outlet pipes, 12c1, 12c2, 12d1, 12d2 ... notches, 12e-12h ... seal pipes, 12i, 12j ... first and second electrode bodies, 12k, 12l ... first and second gas introduction pipes, 13 ... impedance Measuring instrument, 13a ... Potentiostat, 13b ... Frequency response analyzer, 13c ... Potential cable, 13c1, 13c2 ... Pair of wires, 13d ... Current cable, 13d1, 13d2 ... Pair of wires, 14 ... Control device, 14a ... Deriving unit, 14b: Cole-Cole plot display section, 14c: Ohmic resistance value deriving section, 14d: Fuel electrode reaction resistance deriving section, 4e ... oxidant electrode reaction resistance value deriving part, 20 ... single cell (solid oxide fuel cell single cell), 21 ... fuel electrode, 22 ... air electrode, 23 ... electrolyte, A1, A2 ... semicircular part, A3 ... Semicircular part, C2, C3 ... capacitor component, L ... inductance, R1 ... resistance, R2, R3 ... resistance component.

Claims (3)

A solid oxide fuel cell single cell held by a holding current collector for holding a solid oxide fuel cell single cell and taking out an electric current, via a potential cable and a current cable each twisted with a pair of wires A connected impedance measuring instrument;
A derivation unit for deriving the electrode reaction resistance value and the ohmic resistance value of the fuel electrode and the oxidant electrode of the solid oxide fuel cell single cell from the real component and the imaginary component of the impedance measured by the impedance measuring device and, with a,
The holding current collector is
It is arranged in a heat insulating tube formed in a cylindrical shape with a heat insulating material, and
A first holder tube which is formed in a cylindrical shape and holds the solid oxide fuel cell single cell from the fuel electrode side;
A second holder tube formed in a cylindrical shape to hold the solid oxide fuel cell single cell from the oxidant electrode side;
A first electrode body connected to one of the electric potential cable and the current cable and contacting the fuel electrode;
A second electrode body connected to the other electric wire of the potential cable and the current cable and in contact with the oxidant electrode;
A first gas introduction pipe disposed in the first holder pipe and formed in a cylindrical shape to supply fuel gas to the fuel electrode;
A second gas introduction pipe disposed in the second holder pipe and formed in a cylindrical shape to supply an oxidant gas to the oxidant electrode;
The first holder tube is disposed between the solid oxide fuel cell unit cell, and is formed in a cylindrical shape and includes a cutout portion into which one of the electric wires of the potential cable and the current cable is inserted. A first cable outlet pipe;
A notch is provided between the second holder tube and the solid oxide fuel cell single cell, and is formed in a cylindrical shape and into which the other electric wire of the potential cable and the current cable is inserted. A second cable outlet pipe;
The derivation | leading-out apparatus which derives | leads-out each resistance value which concerns on the solid oxide fuel cell single cell provided with . The derivation unit includes:
A Cole-Cole plot display section showing a real component and an imaginary component of the impedance in a Cole-Cole plot;
When the relationship between the real component and the imaginary component of the impedance indicated by the Cole-Cole plot display unit is two semicircular shapes projecting upward, the semicircular portion closer to the imaginary axis An ohmic resistance value deriving unit for deriving a value at which the left end intersects the real axis as a resistance value of the ohmic resistance;
A fuel electrode reaction resistance value deriving unit for deriving a value corresponding to the size of the portion where the semicircular portion near the imaginary axis intersects the real axis as an electrode reaction resistance value of the fuel electrode;
An oxidant electrode reaction resistance value deriving unit for deriving a value corresponding to the size of the part where the semicircular part far from the imaginary axis intersects the real axis as an electrode reaction resistance value of the oxidant electrode; A derivation device for deriving each resistance value according to the solid oxide fuel cell single cell according to claim 1 . Between the solid oxide fuel cell unit cell and the first cable outlet tube, between the first cable outlet tube and the first holder tube, the solid oxide fuel cell unit cell and the second cable. between the take-out tube, and, between the second holder pipe and the second cable take-out tube is a glass material cylindrical shape formed seal according to claim 1 or claim 2, wherein is sealed by tube A derivation device for deriving each resistance value of a solid oxide fuel cell single cell.

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