JP5396823B2 - Current measuring device - Google Patents

Description

  The present invention relates to a current measuring device that measures a current flowing inside a fuel cell.

  Conventionally, Patent Document 1 discloses a current measuring device that is applied to a fuel cell configured by laminating and arranging a plurality of cells that output electric energy, and measures the current flowing inside the fuel cell. The current measurement device of Patent Document 1 includes a first electrode that is in electrical contact with one of adjacent cells, a second electrode that is in electrical contact with the other cell, and a first electrode and a second electrode. And a current measuring unit configured to have a plate-like resistor that electrically connects the two.

Then, the potential difference between the first connection part that connects the first electrode of the current measurement part and the resistor and the second connection part that connects the resistor and the second electrode is detected by the voltage sensor for current measurement. The current flowing inside the fuel cell is measured by dividing the measured potential difference by the electric resistance value of the resistor.
JP 2007-280643 A

  By the way, when the current measuring device of Patent Document 1 is used as a current detecting means for measuring the AC impedance of the fuel cell, there is a problem that the AC impedance cannot be accurately measured when the AC current applied to the fuel cell becomes a high frequency. It was.

  Therefore, when the present inventors investigated the cause, when a high-frequency current flows through the current path of the resistor in the current measuring device, an inductance is generated due to the counter electromotive force of the magnetic flux generated in the current path of the resistor, It turned out that the influence of inductance cannot be ignored. That is, it has been found that due to the influence of the inductance of the resistor in the current measuring device, the current measuring device of Patent Document 1 causes a large error with respect to the actually flowing high-frequency current and cannot perform accurate current measurement. .

  In view of the above points, an object of the present invention is to improve the current measurement accuracy by reducing the influence of inductance due to a high-frequency current in a current measurement device including a current measurement unit configured with a resistor.

  The present invention has been devised to achieve the above object. In the invention according to claim 1, a plurality of cells (10a) for outputting electric energy by electrochemical reaction of an oxidant gas and a fuel gas. Is a current measuring device that is applied to a fuel cell (10) configured by stacking and measuring the current flowing inside the fuel cell (10), and is disposed between adjacent cells (10a). A first electrode (111) in electrical contact with one cell of the matching cells (10a), a second electrode (141) in electrical contact with the other cell of adjacent cells (10a), and a first One or more current measurement units (101) having a resistor having a predetermined electrical resistance value while electrically connecting the electrode (111) and the second electrode (141), and two points of the resistor Potential difference detecting means for detecting potential difference (102) Current value detecting means (51) for detecting the current value flowing through the cell (10a) using the resistance value between the two points of the resistor and the detected potential difference detected by the potential difference detecting means (102), The resistor includes a first resistor part (121, 126a) electrically connected to the first electrode (111) side and a second resistor part (131, electrically connected to the second electrode (141) side. 126b), and the first resistor part (121, 126a) and the second resistor part (131, 126b) are connected to the first resistor part (121, 126a) in the current flow direction and the second resistor part (131, 126b). ) Are arranged so as to be parallel to each other and opposite to each other.

  According to this, since the flow direction of the current flowing through the resistor is arranged so as to be opposite to each other in the first resistance portion (121, 126a) and the second resistance portion (131, 126b), When a high-frequency current flows through the current path of the resistor, the magnetic field generated by the current is also in the opposite direction and acts to cancel each other. Therefore, the influence of the inductance of the resistor due to the high frequency current can be reduced, and the measurement accuracy of the current measuring device (100) can be improved.

Further, the invention described in claim 1, the first resistor section (121) the second resistance portion (131) is electrically connected through resistor connecting portion (101a), the first resistor section (121) and the second resistance portion (131) are provided with an insulating layer. The first resistance portion (121) is disposed on the first electrode (111) side of the insulating layer, and the second resistance portion ( 141) is configured to be disposed on the second electrode (141) side in the insulating layer .
Furthermore, in the first aspect of the present invention, the current measuring unit (101) includes the first electrode (111) side configuration and the first resistor (121) between the first resistor (121) and the second resistor (131). The second electrode (141) side is provided so as to be symmetrical.
According to this, since the fluctuation | variation of the magnetic permeability which arises by the structure around the 1st resistance part (121) and the 2nd resistance part (131) can be suppressed, the electric current which flows through each resistance part (121, 131) can be suppressed. The magnetic fields to be created can be canceled more effectively.

Further, as in the invention described in claim 6 , in the invention described in any one of claims 1 to 5 , the insulating layer includes a first resistor portion (121) and a second resistor portion (131). It is a thin film-like insulating adhesive (124) to be bonded.

  According to this, the space | interval of a 1st resistance part (121) and a 2nd resistance part (131) can be narrowed, and the magnetic fields which the electric current which flows through each resistance part (121, 131) produce more effectively. Can be countered.

Further, as in the invention described in claim 7 , in the invention described in any one of claims 1 to 6 , the potential difference detecting means (102) is configured to include the first resistor portion (121) and the second resistor portion (131). ) May be configured to detect a potential difference between two points in one resistance portion.

  According to this, it is possible to reduce the influence of the current flowing in the current measurement unit (101) other than the resistor, that is, the influence of the inductance generated in the resistor connection unit (101a), and the current measurement device (100). The measurement accuracy can be further improved.

Further, in the invention according to claim 2, in the invention described in claim 1, the first electrode (111) is disposed on the first printed circuit board (110), second electrode (141), second printed The first printed circuit board (110) and the second printed circuit board (140) are arranged on the substrate (140), and are integrated as a laminated substrate with at least the first resistance part (121) and the second resistance part (131) sandwiched therebetween. coupled to a first printed circuit board (110) between the second printed circuit board (140), a first connecting portion connecting the first resistor portion first electrode (111) and (121) electrically A wiring pattern (122) for connecting (101b) to the potential difference detection means (102), and a second connection part (101c) for electrically connecting the second electrode (141) and the second resistance part (131) The potential difference detection means 102) is provided with a pair of printed circuit boards (120, 130) provided with a wiring pattern (132) for connection to the first resistance unit (121) and the second printed circuit board (120, 130). The wiring pattern () is provided so as to be symmetrical between the first resistance part (121) and the second resistance part (131), with the resistance part (131) interposed therebetween. .

  According to this, since the fluctuation | variation of the magnetic permeability produced by the wiring pattern of the vicinity of the 1st resistance part (121) and the 2nd resistance part (131) can be suppressed, the magnetic field which the electric current which flows through each resistance part (121, 131) produces You can cancel each other more effectively.

According to a third aspect of the invention, in the second aspect of the invention, the printed circuit board (120) on the first electrode (111) side and the first printed circuit board (120) of the pair of printed circuit boards (120, 130). 110) and between the printed circuit board (130) on the second electrode (141) side and the second printed circuit board (140), ferromagnetic materials (125, 135) are respectively disposed. Features.

  According to this, the ferromagnetic material (125, 135) disposed between the pair of printed circuit boards (120, 130) on which the wiring pattern is formed and the electrodes (111, 141) is caused to act as a magnetic shield. Therefore, the influence on the current measurement unit (101) due to magnetic field noise generated in the outside world can be reduced.

According to a fourth aspect of the present invention, in the second or third aspect of the present invention, a plurality of current measuring units (101) are arranged between the same adjacent cells (10a), and a plurality of current measuring units are arranged. Between (101), the gap (103) which electrically divides wiring patterns in a different electric current measurement part (101) is provided.

  As described above, since the plurality of current measurement units (101) are configured to electrically separate the wiring patterns between the different current measurement units (101) by the gap (103), in the vicinity of the current measurement unit (101). The influence of magnetic field noise can be suppressed.

According to a fifth aspect of the present invention, in the first to third aspects of the present invention, a plurality of current measurement units (101) are arranged, and the plurality of current measurement units (101) are arranged adjacent to each other. 101), the current flowing through the first resistor part (121) and the second resistor part (131) is arranged in the opposite direction.

  As described above, the adjacent current measurement units (101) are arranged so that the flow directions of the currents flowing through the first resistance unit (121) and the second resistance unit (131) are opposite to each other. The influence of magnetic field noise generated between the parts (101) can be suppressed.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of a fuel cell system to which a current measuring device 100 of the present embodiment is applied. This fuel cell system is applied to a so-called fuel cell vehicle, which is a kind of electric vehicle, and supplies electric power to an electric load such as an electric motor for vehicle travel.

  First, as shown in FIG. 1, the fuel cell system includes a fuel cell 10 that generates electric power using an electrochemical reaction between hydrogen and oxygen. The fuel cell 10 outputs electric energy supplied to an electric load such as an electric motor for driving a vehicle (not shown), a secondary battery, and various auxiliary machines for vehicles. In this embodiment, a solid polymer electrolyte fuel The battery is adopted.

  More specifically, the fuel cell 10 is configured by electrically connecting a plurality of fuel cell cells 10a (hereinafter simply referred to as cells 10a) as basic units. In each cell 10a, as shown below, hydrogen and oxygen are electrochemically reacted to output electric energy.

(Negative electrode side) H ₂ → 2H ⁺ + 2e ⁻
(Positive electrode side) 2H ⁺ + 1 / 2O ₂ + 2e ⁻ → H ₂ O
The fuel cell 10 is electrically connected to a secondary battery via a DC-DC converter (not shown). The DC-DC converter controls the flow of power from the fuel cell 10 to the secondary battery or from the secondary battery to the fuel cell 10, and can exchange power bidirectionally regardless of the magnitude of the voltage. Yes.

  Furthermore, the electrical energy output from the fuel cell 10 is measured by a cell monitor 11 that detects a voltage output from each cell 10a of the fuel cell 10 and a current sensor 12 that detects a current output as the fuel cell 10 as a whole. Is done. Note that detection signals from the cell monitor 11 and the current sensor 12 are input to a control device 50 described later.

  Further, on the air electrode (positive electrode) side of the fuel cell 10, an air supply pipe 20 a for supplying air (oxygen) as an oxidant gas to the fuel cell 10, and the electrochemical reaction in the fuel cell 10 are finished. An air discharge pipe 20b for discharging the surplus air and generated water generated by the air electrode from the fuel cell 10 to the outside air is connected.

  An air pump 21 is provided at the most upstream portion of the air supply pipe 20a to pump air sucked from the atmosphere to the fuel cell 10, and an air discharge pipe 20b adjusts the pressure of the air in the fuel cell 10. An air pressure regulating valve 23 is provided.

  Further, the air supply pipe 20 a and the air discharge pipe 20 b are provided with a humidifier 22 for moving the humidity (water vapor) of the air flowing out from the air pressure regulating valve 23 to the air pumped from the air pump 21. . The humidifier 22 is composed of a plurality of hollow fibers and functions to humidify the air supplied to the fuel cell 10.

  On the hydrogen electrode (negative electrode) side of the fuel cell 10, a hydrogen supply pipe 30 a for supplying hydrogen, which is a fuel gas, to the fuel cell 10, and the generated water accumulated on the hydrogen electrode side together with a small amount of hydrogen from the fuel cell 10 to the outside air A hydrogen discharge pipe 30b is connected to discharge. Furthermore, the hydrogen supply pipe 30a and the hydrogen discharge pipe 30b are connected via a hydrogen circulation pipe 30c.

  A high-pressure hydrogen tank 31 filled with high-pressure hydrogen is provided at the most upstream portion of the hydrogen supply pipe 30a, and is supplied to the fuel cell 10 between the high-pressure hydrogen tank 31 and the fuel cell 10 in the hydrogen supply pipe 30a. A hydrogen pressure regulating valve 32 for adjusting the pressure of hydrogen is provided.

  The hydrogen discharge pipe 30b is provided with an electromagnetic valve 34 that opens and closes at predetermined time intervals in order to discharge the produced water together with a small amount of hydrogen to the outside air. In the above-described electrochemical reaction, generated water is not generated on the hydrogen electrode side, but generated water that has permeated the electrolyte membrane of each cell 10a from the oxygen electrode side may accumulate on the hydrogen electrode side. Therefore, in this embodiment, the hydrogen discharge pipe 30b and the electromagnetic valve 34 are provided.

  The hydrogen circulation pipe 30c is provided to connect the downstream side of the hydrogen pressure regulating valve 32 of the hydrogen supply pipe 30a and the upstream side of the electromagnetic valve 34 of the hydrogen discharge pipe 30b. Thereby, the unreacted hydrogen flowing out from the fuel cell 10 is circulated to the fuel cell 10 and re-supplied. Further, a hydrogen pump 33 for circulating hydrogen in the hydrogen flow path 30 is disposed in the hydrogen circulation pipe 30c.

  By the way, the fuel cell 10 needs to be maintained at a constant temperature (for example, about 80 ° C.) during operation in order to ensure power generation efficiency. Therefore, a cooling water circuit 40 for cooling the fuel cell 10 is connected to the fuel cell 10. The coolant circuit 40 is provided with a water pump 41 that circulates coolant (heat medium) in the fuel cell 10 and a radiator 43 that includes an electric fan 42.

  Further, the cooling water circuit 40 is provided with a bypass flow path 44 through which the cooling water flows so as to bypass the radiator 43. A flow path switching valve 45 for adjusting the flow rate of the cooling water flowing through the bypass flow path 44 is provided at the junction of the cooling water circuit 40 and the bypass flow path 44. The cooling capacity of the cooling water circuit 40 is adjusted by adjusting the valve opening degree of the flow path switching valve 45.

  Further, a temperature sensor 46 as a temperature detecting means for detecting the temperature of the cooling water flowing out from the fuel cell 10 is provided in the vicinity of the outlet side of the fuel cell 10 in the cooling water circuit 40. By detecting the cooling water temperature by the temperature sensor 46, the temperature of the fuel cell 10 can be indirectly detected. The detection signal of the temperature sensor 46 is also input to the control device 50.

  The control device 50 controls the operation of various electric actuators constituting the fuel cell system on the basis of input signals, and is composed of a well-known microcomputer comprising a CPU, ROM, RAM, etc. and its peripheral circuits. Yes.

  Specifically, on the input side of the control device 50, in addition to the above-described detection signals of the cell monitor 11, the current sensor 12, and the temperature sensor 46, a current output from a current detection circuit 51 of the current measurement device 100 described later. A signal is input. On the other hand, on the output side, various electric actuators such as the air pump 21, the air pressure regulating valve 23, the hydrogen pressure regulating valve 32, the hydrogen pump 33, the electromagnetic valve 34, the water pump 41, and the flow path switching valve 45 are connected. Yes.

  Next, details of the current measuring apparatus 100 of the present embodiment will be described. The current measuring device 100 includes a current measuring unit assembly plate 100a in which a plurality of current measuring units 101 are integrally configured as a plate member, and a current measuring voltage sensor 102 that detects a potential difference between predetermined portions of each current measuring unit 101. And a current detection circuit 51 that detects a current of a portion corresponding to the arrangement position of each current measurement unit 101 in the plate surface of the cell 10a and outputs the current to the control device 50.

  First, the current measurement unit assembly plate 100a will be described with reference to FIGS. 2 is an external perspective view of the fuel cell 10, and FIG. 3 is an exploded view of the current measurement unit assembly plate 100a. As shown in FIG. 2, a plurality of current measurement unit assembly plates 100a are provided, and are arranged between adjacent cells 10a.

  Further, as shown in FIG. 3, the current measurement unit assembly board 100 a of the present embodiment includes a first printed board 110, a second printed board 140, a third printed board 120, and a first printed board on which a wiring pattern is formed (printed). 4 printed circuit boards 130 are provided. And these printed circuit boards 110-140 are comprised as a laminated substrate integrated by the hot press in the state which respectively interposed the thin-film-like insulating adhesive agent.

  In addition, as a 1st-4th printed circuit board 110-140, a general glass epoxy board | substrate is employable. In addition, in the current measurement unit assembly plate 100a configured as a multilayer substrate, three through-holes penetrating the front and back of the multilayer substrate are formed in the vicinity of two opposing sides (left and right sides in FIG. 3). Yes. These through holes function as a manifold for circulating air, hydrogen, and cooling water when the cells 10a are stacked.

  Furthermore, between the manifolds on both sides, a plurality of current measuring units 101 are arranged in a matrix (lattice) in two orthogonal directions. More specifically, as shown in FIG. 3, the current measuring units 101 of this embodiment are arranged in a matrix of six in the vertical direction on the paper and seven in the horizontal direction on the paper.

  That is, in the present embodiment, a plurality of current measuring units 101 are arranged between the same adjacent cells 10a. As a result, the plurality of current measurement units 101 are arranged over the entire plate surface of the current measurement unit assembly plate 100a. Therefore, in the current measurement device 100 of the present embodiment, the current in the plane of the cell 10a. The density distribution can be measured.

  The current measurement unit 101 includes a first electrode 111 that is in electrical contact with one of the adjacent cells 10a, a second electrode 141 that is in electrical contact with the other cell 10a of the adjacent cells 10a, and The first electrode 111 and the second electrode 141 are electrically connected and have a resistor having a predetermined electric resistance value.

  Therefore, the 1st electrode 111 and the 2nd electrode 141 are comprised as a pair of electrodes, and are arrange | positioned at the both plate | board surface of the plate-shaped electric current measurement part assembly board 100a. Specifically, the first electrode 111 is disposed on a surface (front side in FIG. 3) facing one cell 10 a of the first printed circuit board 110, and the second electrode 141 is disposed on the other side of the second printed circuit board 140. It is arrange | positioned in the surface (back side of the paper surface of FIG. 3) which opposes the cell 10a.

  In addition, the resistor includes a plate-like first resistor 121 that is electrically connected to the first electrode 111 and a plate-like second resistor 131 that is electrically connected to the second electrode 141. Yes. And the 1st resistance part 121 and the 2nd resistance part 131 are opposingly arranged in the lamination direction of a laminated substrate in the state insulated with the thin-film-like insulating adhesive agent 124. FIG.

  In other words, in the resistor according to this embodiment, the first resistor 121 disposed on the first electrode side of the insulating adhesive 124 and the second resistor 131 disposed on the second electrode side are parallel to each other. Are arranged opposite to each other. Here, the opposing arrangement of the first resistance part 121 and the second resistance part 131 includes the second resistance part 131 adjacent to the first resistance part 121 at a position orthogonal to the current flow direction and the second resistance part 121. This means a relationship in which the first resistance part 121 adjacent to the position of the part 131 orthogonal to the current flow direction is arranged.

  Specifically, the first resistance portion 121 is disposed on the surface of the third printed circuit board 120 opposite to the surface facing the first printed circuit board 110 (the back side in FIG. 3). A first current measurement wiring 122 is provided on the surface of the third printed circuit board 120 opposite to the side on which the first resistance portion 121 is formed (the front side in FIG. 3). Furthermore, on one side of the third printed circuit board 120 of the present embodiment, a signal extraction connector 123 to which the first current measurement wiring 122 is connected is provided. In FIG. 3, the first current measurement wiring 122 is indicated by oblique lines surrounded by a solid line.

  On the other hand, the second resistance portion 131 is disposed on the surface of the fourth printed circuit board 130 opposite to the surface facing the second printed circuit board 140 (the front side in FIG. 3). A second current measurement wiring 132 is provided on the surface of the fourth printed circuit board 130 opposite to the side on which the second resistance portion 131 is formed (the back side in FIG. 3).

  Furthermore, on one side of the fourth printed circuit board 130 of the present embodiment, a signal extraction connector 133 to which the second current measurement wiring 132 is connected is provided. In FIG. 3, the second current measurement wiring 132 is indicated by hatching surrounded by a broken line.

  The first electrode 111, the second electrode 141, the first and second resistance parts 121 and 131, and the first and second current measurement wirings 122 and 132 are formed on a metal foil (specifically, a copper foil). The wiring patterns are formed on the first to fourth printed boards 110 to 140.

  Next, referring to FIGS. 4 and 5, specific stacking modes of the first to fourth printed circuit boards 110 to 140, and the first electrode 111, the second electrode 141, the first and second resistors constituting the current measuring unit 101 are used. The electrical connection mode of the sections 121 and 131 and the current measurement wirings 122 and 132 will be described. 4 is a cross-sectional view of the current measuring unit 101, and FIG. 5 is an explanatory diagram showing the flow of current in the current measuring unit 101.

  As shown in FIG. 4, between the first printed circuit board 110 and the third printed circuit board 120, between the third printed circuit board 120 and the fourth printed circuit board 130, and between the fourth printed circuit board 130 and the second printed circuit board 140. Insulating adhesives 112, 124, and 134 having electrical insulating properties are arranged.

  The first to fourth printed circuit boards 110 to 140 are provided with a plurality of through holes 101a having a round hole shape. The first and third printed circuit boards 110 and 130 are provided with a first blind via hole 101b, and the fourth and second printed circuit boards 130 and 140 are provided with a second blind via hole 101c.

  On the inner peripheral surfaces of the through hole 101a and the first and second blind via holes 101b and 101c, a conductor made of the same metal foil as that of the first and second electrodes 111 and 141 is formed.

  The first electrode 111, the first resistor 121, and the first current measurement wiring 122 are connected through the first blind via hole 101b. The first resistor 121 and the second resistor 131 are connected via the through hole 101a, and the second resistor 131, the second electrode 141, and the second current measurement wiring are connected via the second blind via hole 101c. 132 is connected.

  Accordingly, the first and second blind via holes 101b and 101c constitute the first and second connection portions of the present embodiment, respectively, and the through hole 101a constitutes the resistor connection portion of the present embodiment. The through hole 101a and the first and second blind via holes 101b and 101c are arranged in a direction perpendicular to the direction of current flow through the first and second resistance portions 121 and 131, respectively.

  The first electrode 111 is connected to one end side of the first resistance unit 121, and the second resistance unit 131 is connected to the other end side of the first resistance unit 121. The second electrode 141 is connected to one end of the second resistor 131 where the first resistor 121 is not connected.

  Here, the first and second blind via holes 101b and 101c are formed by interposing a thin film-like insulating adhesive 124 that bonds between the first resistance portion 121 and the second resistance portion 131, so that the first and second blind via holes 101b and 101c are interposed. The blind via holes 101b and 101c are not electrically connected. Here, in this embodiment, the thin insulating adhesive 124 corresponds to the insulating layer. Note that other methods may be employed for the insulating layer as long as the first and second resistance portions 121 and 131 can be insulated.

  The first electrode 111 and the second electrode 141 are provided with relief portions 113 and 142 so that the first electrode 111 and the second electrode 141 are not electrically connected to both end sides of the through hole 101a. Yes.

  Therefore, in the resistor composed of the first resistor portion 121 and the second resistor portion 131, current flows from one end side to the other end side of the first resistor portion 121 as shown in FIG. A current flows from one end side of the two-resistance portion 131 to the other end side.

  That is, the flow direction of the current flowing through the first resistance part 121 disposed on the first electrode 111 side and the flow direction of the current flowing through the second resistance part 131 disposed on the second electrode side 141 side are parallel to each other. And it is in the opposite direction. In other words, when viewed from the cross section of the current measurement unit 101 including the first resistance unit 121, the second resistance unit 131, and the through hole 101a, the first resistance unit 121, the second resistance unit 131, and the through hole 101a. The current flow in is bent in a U-shape.

  Here, in the current measurement unit assembly plate 100a of the present embodiment, the configuration on the first electrode 111 side and the configuration on the second electrode 141 side are mutually separated from each other between the first resistance unit 121 and the second resistance unit 131. It is provided to be symmetrical. Specifically, the first current measurement wiring 122 and the second current measurement wiring 132 are interconnected with the insulating adhesive 124 between the first resistance portion 121 and the second resistance portion 131 as a boundary. Are provided so as to be symmetrical.

  As shown in FIGS. 4 and 5, a current measuring voltage sensor 102 is connected to the through hole 101a and the second blind via hole 101c via a second current measuring wiring 132 and an external wiring, respectively. . The voltage sensor for current measurement 102 detects a potential difference between two points of the through hole 101a on the second current measurement wiring 132 side and the second blind via hole 101c, and outputs a detection signal to the current detection circuit 51. Means.

  The current detection circuit 51 performs an arithmetic process using the detection potential difference of the voltage sensor 102 for current measurement and the electric resistance value of the second resistance part 131 between the through hole 101a and the second blind via hole 101c, thereby performing the processing of the cell 10a. It is a current value detection means for calculating a current flowing through a portion corresponding to each current measurement unit 101 in the plane.

  Next, a current measurement method using the current measurement apparatus 100 will be described. By supplying hydrogen and air to the fuel cell 10, power generation in the fuel cell 10 is started. In each current measurement unit 101 of the current measurement device 100, a current flows from the cell 10 a upstream in the current flow direction to the plate surface of the first electrode 111.

  Then, a current flows in the order of the first electrode 111 → the first blind via hole 101b → the first resistance portion 121 → the through hole 101a → the second resistance portion 131 → the second blind via hole 101c → the second electrode 141, and the second electrode 141 Current flows from the plate surface to the cell 10a downstream in the current flow direction.

  At this time, the potential difference between the two points of the through hole 101a and the second blind via hole 101c is measured by the voltage sensor 102 for current measurement. As described above, in the present embodiment, since the first and second resistance portions 121 and 131 having predetermined electric resistance values are used, the second resistance portion 131 between the through hole 101a and the second blind via hole 101c is used. The electric resistance value is also a known value.

  Therefore, the current detection circuit 51 stores the potential difference detected by the current measurement voltage sensor 102 as known information in advance, and performs arithmetic processing to divide by the electric resistance value of the second resistance unit 131, thereby performing the second resistance. The value of the current flowing through the unit 131 is calculated. Then, the current detection circuit 51 outputs the current value obtained by the calculation process to the control device 50.

  Further, the control device 50 detects the current distribution in the plane of the cell 10a, estimates the power generation state of the fuel cell 10 based on the detected current distribution, and supplies the air supply amount and supply pressure, the hydrogen supply pressure, and the cooling water circulation. The amount is controlled. This improves the efficiency and reliability of the fuel cell system.

  Specifically, the power generation state of the above-described fuel cell 10 can be estimated based on a change in AC impedance of each cell 10a. Here, the AC impedance measurement method in the present embodiment will be briefly described. First, an alternating current having a predetermined current is applied to the fuel cell 10 using a secondary battery, a DC-DC converter, or the like. When alternating current is applied to the fuel cell 10, the current distribution input from the cell monitor 11 and the current detection circuit 51 is measured. The AC impedance of each cell 100 can be measured by calculation based on the change in voltage value measured by the cell monitor 11 and the change in current distribution input from the current detection circuit 51.

  When the AC impedance of the fuel cell 10 is measured by such a method, the conventional current measuring unit 101 generates a magnetic field when the AC current passes through the resistor, and generates a magnetic flux generated in the current path of the resistor. Inductance is generated by back electromotive force (self-induced electromotive force). And if an alternating current becomes a high frequency, the influence of inductance cannot be ignored.

  As described above, the first resistance unit 121 and the second resistance unit 131 in the current measurement unit 101 of the current measurement unit assembly plate 100a of the present embodiment are configured such that the direction of current flow through each resistance unit is the same as that of the first resistance unit 121. The second resistor 131 is disposed so as to face the opposite direction. Therefore, the magnetic fields generated by the currents flowing through the first resistance part 121 and the second resistance part 131 are also in opposite directions, and the magnetic fields generated in the first resistance part 121 and the second resistance part 131 act so as to cancel each other.

  Here, the result when the alternating current was applied to the fuel cell 10 and the alternating current impedance was measured using the current measuring device 100 was the result shown in FIG. 6A shows the result when the AC impedance is measured using a conventional current measuring device, and FIG. 6B shows the result when the AC impedance is measured using the current measuring device of the present embodiment. Results are shown.

  As shown in FIG. 6, when measuring the AC impedance (resistance value) using a conventional current measuring device, the AC impedance was reduced when the applied AC current was made high frequency. Moreover, when measuring the alternating current impedance (resistance value) using the current measuring apparatus of this embodiment, even if the applied alternating current was a high frequency, the alternating current impedance was substantially constant.

  As described above, in the current measuring device 100 including the current measuring unit 101 of the present embodiment, even when a high frequency current is applied to the fuel cell 10, the influence of the inductance of the resistor can be reduced, and current measurement is performed. The measurement accuracy of the apparatus 100 can be improved.

  In the present embodiment, since the thin insulating adhesive 134 is interposed between the first resistor 121 and the second resistor 131, the first resistor 121, the second resistor 131, and the like. , And the magnetic fields generated by the currents flowing through the resistance portions 121 and 131 can be effectively canceled.

  Here, the magnitude of the magnetic field in each of the resistance parts 121 and 131 varies depending on the magnetic permeability around the resistance parts 121 and 131 in the magnetic field generated by the current flowing through the resistance parts 121 and 131. Therefore, as in the present embodiment, each resistor is provided so that the configuration on the first electrode 111 side and the configuration on the second electrode 141 side are symmetrical with each other between the resistor portions 121 and 131. Variations in the magnetic permeability of the magnetic field caused by the configuration around the portions 121 and 131 can be suppressed. Thereby, the magnetic fields created by the currents flowing through the resistance parts 121 and 131 can be canceled more effectively.

  Further, the through holes 101a and the blind via holes 101b, 101c, etc. provided in the current measuring unit assembly plate 100a themselves become electric resistances, and their resistance values are likely to vary, thereby reducing the detection accuracy of the current measuring device 100. It may contribute.

  Therefore, in the present embodiment, the potential difference between the through hole 101a on the second current measurement wiring 132 side detected by the current measurement voltage sensor 102 and the second blind via hole 101c and the electric resistance value of the second resistance portion 131 are used. The current of the corresponding part of each current measuring unit 101 is calculated.

  According to this, since the current can be measured without being affected by the electrical resistance of the through hole 101a between the first resistor portion 121 and the second resistor portion 131, the measurement accuracy of the current measuring device 100 is further improved. Can be made.

  In the present embodiment, the corresponding portion of each current measurement unit 101 is determined based on the potential difference between the through hole 101a and the second blind via hole 101c detected by the current measurement voltage sensor 102 and the electric resistance value of the second resistance unit 131. Although the current is calculated, the present invention is not limited to this. For example, the current measurement voltage sensor 102 detects a potential difference between the first blind via hole 101b and the through hole 101a, and based on the detected value and the electric resistance value of the first resistance part 121, the corresponding part of each current measurement part 101 is detected. The current may be calculated.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. Here, FIG. 7 is a cross-sectional view of the current measurement unit 101. FIG. 8 is a partial cross-sectional view of the current measuring unit assembly plate 100a, and FIG. 9 is an explanatory view showing the flow of current in the cross-sectional view of FIG.

  In the first embodiment described above, the configuration has been described in which the influence of the inductance due to the counter electromotive force (self-induced electromotive force) of the magnetic flux generated in the current path of the resistor is reduced. In this embodiment, in addition to the counter electromotive force (self-induced electromotive force) of the magnetic flux generated in the current path of the resistor, the influence of the inductance due to the counter electromotive force (mutually induced electromotive force) of the magnetic flux generated by the configuration around the resistor. A configuration for reducing the above will be described. Hereinafter, the same or equivalent parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 7, the current measurement unit 101 according to the present embodiment includes ferromagnetic materials between the first printed board 110 and the third printed board 120 and between the fourth printed board 130 and the second printed board 140. 125 and 135 are interposed. Here, the ferromagnetic materials 125 and 135 can be made of a material such as iron or nickel.

  The ferromagnetic bodies 125 and 135 include the first resistance part 121 and the first current measurement wiring 122 of the third printed circuit board 120, the second resistance part 131 and the second current measurement wiring 132 of the fourth printed circuit board 130, and the like. It is used as a magnetic shield that shields magnetically from the outside.

  Therefore, the ferromagnetic bodies 125 and 135 can reduce the influence of inductance caused by counter electromotive force (mutually induced electromotive force) due to magnetic flux from the outside. For example, the ferromagnetic bodies 125 and 135 can prevent mutual induction due to the magnetic field generated in the first and second electrodes 111 and 141.

  Further, as shown in FIG. 8, the plurality of current measurement units 101 are provided with gaps 103 that electrically divide the wiring patterns between different current measurement units 101. In the present embodiment, the gap 103 is composed of insulating adhesives 112, 124, and 134.

  Thereby, the influence of the magnetic field noise from the adjacent electric current measurement part 101 can be reduced. For example, the gap 103 can prevent mutual induction due to the magnetic field generated in the first and second electrodes 111 and 141 of the other current measurement unit 101.

  Further, as shown in FIG. 9, adjacent current measurement units 101 in the plurality of current measurement units 101 are provided such that the flow directions of the currents flowing through the first resistance unit 121 and the second resistance unit 131 are opposite to each other. It has been.

  According to this, it is possible to cause the magnetic field generated in the resistance units 121 and 131 of one current measurement unit 101 of the adjacent current measurement units 101 to be canceled by the magnetic field generated in the other resistance units 121 and 131. . As a result, it is possible to suppress the generation of magnetic field noise that occurs between adjacent current measuring units 101.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. Here, FIG. 10 is a schematic diagram of the current measurement unit 101 of the present embodiment. FIG. 11 is a front view of the resistor 126 of the present embodiment, and FIG. 12 is an explanatory diagram for explaining the current flow of the resistor 126 of the current measuring unit 101 arranged on the current measuring unit assembly plate 100a. It is. In the present embodiment, the same or equivalent parts as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  The current measuring unit assembly board 100a of the present embodiment has three printed boards, first to third printed boards 110, 120, and 140, and these printed boards 110, 120, and 140 are integrated laminates. It is configured as a substrate.

  A plurality of current measurement units 101 are arranged in a matrix shape (lattice shape) in two directions orthogonal to each other on the current measurement unit assembly plate 100a, and each current measurement unit 101 includes a first electrode 111 and a second electrode 141, respectively. The resistor 126 is provided.

  As shown in FIG. 10, the first electrode 111 is disposed on the first printed circuit board 110, and the second electrode 141 is disposed on the second printed circuit board 140. Further, the resistor 126 is disposed on the surface of the third printed circuit board 120 that faces the first printed circuit board 110 (the front side in FIG. 10).

  The current measurement unit 101 in the current measurement unit assembly plate 100a is provided with a plurality of first and second through holes 101d and 101e having a round hole shape. The plurality of first and second through holes 101d and 101e are provided on the same straight line along one end side (the upper end side in FIG. 10) of the current measurement unit 101.

  The plurality of first through-holes 101d and the plurality of second through-holes 101e are divided with the approximate center on one end side (the upper end side in FIG. 10) of the current measurement unit 101 as a boundary. Specifically, in the present embodiment, a plurality of first through holes 101d are provided on the left side of the center on one end side (the upper end side in FIG. 10) of the current measuring unit 101, and a plurality of second through holes are provided on the right side of the center. A through hole 101e is provided.

  Then, the first electrode 111 and the resistor 126 of the current measurement unit 101 are connected via the plurality of first through holes (first connection portions) 101d, and the plurality of second through holes (second connection portions) 101e are connected. The second electrode 141 of the current measuring unit 101 and the resistor 126 are connected via each other.

  Here, the first electrode 111 is provided with an escape portion (not shown) so that the first electrode 111 and the second through hole 101e are not electrically connected, and the second electrode 141 has the second electrode. An escape portion (not shown) is provided so that 141 and the first through hole 101d are not electrically connected. Note that the current value flowing through the resistor 126 can be calculated by measuring the potential difference between two points of the first through hole 101d and the second through hole 101e by the current measuring voltage sensor 102.

  Next, details of the resistor according to the present embodiment will be described with reference to FIG. As shown in FIG. 11, the resistor 126 of the present embodiment is configured by a plate-like member having a plate surface orthogonal to the arrangement direction of the first electrode 111 and the second electrode 141 (the stacking direction of the cells 10 a). Yes. Specifically, the resistor 126 is composed of a plate-shaped metal foil (for example, copper foil).

  The resistor 126 is electrically connected to the first electrode 126 through the first through hole 101d and the second electrode 141 through the second through hole 101e. A second resistance portion 126b.

  The first resistor 126a has a shape extending from one end of the resistor 126 on the side where the first through hole 101d is provided toward the other end. That is, the first resistor 126a has a shape extending from the left upper end of the resistor 126 toward the left lower end in FIG.

  The second resistance portion 126b has a shape extending from one end of the resistor 126 on the side where the second through hole 101e is provided toward the other end. In other words, the second resistance portion 126b has a shape extending from the right upper end of the resistor 126 toward the right lower end in FIG. The second resistor 126b is disposed on the same plate surface as the first resistor 126a, and is provided so that the current flow direction of the second resistor 126b is parallel to the current flow direction of the first resistor 126a. ing.

  And the connection for electrically connecting the 1st resistance part 126a and the 2nd resistance part 126b to the other end side (lower end side of the resistor of Drawing 11) of the 1st and 2nd resistance parts 126a and 126b. A resistance portion 126c is provided. In addition, the connection resistance part 126c is provided so that the lower end side of the resistor 126 may be extended in the left-right direction.

  The first resistance portion 126a, the second resistance portion 126b, and the connection resistance portion 126c of the present embodiment are provided on the same plate surface of the resistor 126, and are configured by a single metal foil. In addition, the 1st resistance part 126a and the 2nd resistance part 126b are opposingly arranged in parallel on the same board surface of a resistor.

  Between the first resistance portion 126a and the second resistance portion 126b, the other end side from between the first and second through holes 101d and 101e provided on one end side (the upper end side in FIG. 11) of the resistor 126. A slit portion 127 extending toward the connection resistance portion 126c (on the lower end side in FIG. 11) is formed. Specifically, the slit portion 127 is formed so as to divide the resistor 126 at a substantially central position in the left-right direction, the upper end side of the resistor 126 is in an open state, and the lower end side is closed by the connection resistor portion 126c. It is in a state.

  The slit 127 is formed by removing the metal foil between the first resistor 126a and the second resistor 126b. Therefore, the slit portion 127 functions as an insulating portion that insulates between the first resistance portion 126a and the second resistance portion 126b. Note that the first resistance portion 126a and the second resistance portion 126b are provided so that their shapes are symmetrical with respect to the slit portion 127 in order to suppress fluctuations in the magnetic permeability of the magnetic field.

  Next, the current flowing in the current measuring unit 101 of the present embodiment, as shown by the arrows in FIGS. 10 and 11, is the first electrode 111 → the first through hole 101d → the first resistor 126a → the connection resistor 126c. → The second resistor 126b → the second through hole 101e → the second electrode 141 flows.

  Here, in the first resistor 126a, the second resistor 126b, and the connection resistor 126c, the first resistor 126a and the second resistor 126b are arranged in parallel on the same plate surface so that the resistor 126 is disposed. The shape when viewed from the direction orthogonal to the plate surface is a U-shape. Therefore, the current flowing through the resistor 126 will meander in a U shape and flow.

  In the resistor 126 having such a configuration, the current flow directions of the first and second resistor portions 126a and 126b are parallel to each other and opposite to each other. As a result, when a high-frequency current flows through the first and second resistance portions 126a and 126b of the resistor 126, the magnetic field generated by the current is also in the opposite direction and acts to cancel each other. Therefore, the influence of the inductance of the resistor 126 due to the high frequency current can be reduced, and the measurement accuracy of the current measuring device 100 can be improved.

  Further, by arranging the first resistance portion 126a, the second resistance portion 126b, and the connection resistance portion 126c on the same plate surface of the resistor 126, the first electrode 111 and the second electrode 141 in the current measurement unit 101 are arranged. The dimension (thickness of the current measurement unit 101) in the arrangement direction (stacking direction of the cells 10a) can be reduced.

  Furthermore, only by forming the slit portion 127 between the first resistance portion 126a and the second resistance portion 126b of the resistor 126, the current flow direction of the first resistance portion 126a and the current flow direction of the second resistance portion 126b Therefore, the resistor 126 can have a simple configuration.

  By the way, the current measurement unit assembly plate 100a of the present embodiment includes a plurality of current measurement units 101 each having the resistor 126 configured as described above, and counter electromotive force (mutual induction) is generated by the magnetic flux generated in the adjacent current measurement units 101. Electromotive force) may occur.

  Therefore, in the current measurement unit 101 of the current measurement unit assembly plate 100a of this embodiment, the current flow direction of the current path of the adjacent resistor 126 in the adjacent current measurement unit 101 is opposite as shown in FIG. Are arranged as follows. FIG. 12 shows a part of the surface of the third printed circuit board 120 on which the resistor 126 is provided.

  Specifically, the current measurement unit 101 has a parallel current flow direction among the first resistance unit 126a, the second resistance unit 126b, and the connection resistance unit 126c in the adjacent current measurement units 101, and It arrange | positions so that the electric current flow direction of the site | part which opposes the direction orthogonal to an electric current flow direction may become an opposite direction.

  Here, the portions of the adjacent current measurement units 101 that face each other in the current flow direction of each of the resistance units 126a, 126b, and 126c are directions that are orthogonal to the current flow direction of each of the resistance units 126a, 126b, and 126c in one current measurement unit. The adjacent resistance part is shown among each resistance part 126a, 126b, 126c in the other electric current measurement part located in FIG.

  For example, as in the present embodiment, when the current flow direction of the first and second resistance units 126a and 126b is the vertical direction, the first resistance of one current measurement unit among the current measurement units 101 adjacent in the horizontal direction. It arrange | positions so that the current flow direction of the part 126a and the 2nd resistance part 126b of the other electric current measurement part may become a reverse direction. In this case, “the portions where the current flow directions are parallel and opposite to each other in the direction perpendicular to each other” are the first resistance portion 126a of one current measurement portion and the first resistance portion 126a of the other current measurement portion. 2 resistance portion 126b.

  Further, when the current flow direction of the connection resistance unit 126c is the left-right direction, the connection resistance unit 126c of one current measurement unit and the connection resistance unit 126c of the other current measurement unit among the current measurement units 101 adjacent in the vertical direction. Are arranged such that the current flow direction is opposite. In this case, “the portions where the current flow directions are parallel and opposite to each other in the direction perpendicular to each other” means the connection resistance portion 126c of one current measurement portion and the connection resistance of the other current measurement portion. Part 126c.

  According to such a configuration, the magnetic field generated by the current flowing through the first resistance unit 126a, the second resistance unit 126b, and the connection resistance unit 126c is in a direction opposite to the direction of the current flowing through the facing portion in the adjacent current measurement unit 101. can do.

  Therefore, since the magnetic fields generated in the adjacent current measuring units 101 act so as to cancel each other, the generation of magnetic field noise generated between the adjacent current measuring units 101 can be suppressed.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be variously modified as follows.

  (1) In the first and second embodiments described above, between the through hole 101a and the second blind via hole 101c formed on both ends of the second resistor 131 or on both ends of the first resistor 121. Although the example in which the potential difference between the through hole 101a formed in the first blind via hole 101b is detected by the current assuming voltage sensor 102 has been described, the present invention is not limited thereto. For example, the potential difference may be detected directly from both ends of the first resistor unit 121 or the second resistor unit 131.

  (2) In the first and second embodiments described above, the first resistance part 121 and the first current measurement wiring 122 are provided on the third printed circuit board 120, and the second resistance part 131 and the second current measurement wiring 132 are provided. Although the example provided in the 4th printed circuit board 130 was demonstrated, it is not limited to this.

  For example, the first resistance part 121 and the first current measurement wiring 122 may be provided on different printed circuit boards, and the second resistance part 131 and the second current measurement wiring 132 are provided on different printed circuit boards. May be. In this case, each printed board may be integrated as a laminated board with the first and second printed boards 110 and 140 sandwiched therebetween.

  (3) In each of the above-described embodiments, an example in which the through hole 101a, the first and second blind via holes 101b, 101c, and the like have a plurality of round hole shapes has been described. However, for example, each may have a single long hole shape. .

  (4) In each of the above-described embodiments, the first electrode 111, the second electrode 141, the first and second resistance portions 121 and 131, the first and second current measurement wires 122 and 132, and the like are formed of copper foil. Although the example has been described, for example, only the first and second resistance portions 121 and 131 may be formed of a material (for example, nickel foil) having a larger resistance value than the first and second electrodes 111 and 141. As a result, in the first and second embodiments, the potential difference between the first and second resistance portions 121 and 131 between the two points of the through hole 101a and the first and second blind via holes 101b and 101c is increased. It becomes easy to measure.

  (5) In the first embodiment described above, three current measurement unit assembly plates 100a are shown in FIG. 2 for clarification of illustration, but the number of current measurement unit assembly plates 100a is not limited to this. . By increasing the number of current measurement unit assembly plates 100a, the current distribution in the plane of the cell 10a can be detected with higher accuracy. For example, it is desirable to arrange one current measurement unit assembly plate 100a for two cells 10a.

  (6) In the first and second embodiments described above, as shown in FIG. 5, the current flowing through the first and second resistance parts 121 and 131 moves downward on the plate surface of the first resistance part 121. Although it is described so as to flow and flow upward in the plate surface of the second resistance part 131, the flow direction of the current flowing through the resistor is not limited to this. For example, the current flowing through the first and second resistor units 121 and 131 flows upward on the plate surface of the first resistor unit 121 and flows downward on the plate surface of the second resistor unit 131. It may be configured.

  Furthermore, the current flowing through each of the resistance parts 121 and 131 may be configured to flow in the left-right direction of the plate surface of each of the resistance parts 121 and 131, or the plate surface of the resistor may be inclined (the resistance of the resistor). You may comprise so that it may flow in the direction which is not parallel to a frame side. In any configuration, it is necessary to configure the current flow directions of the current flowing through the first resistance portion 121 and the current flowing through the second resistance portion 131 to be opposite to each other.

  (7) In the third embodiment described above, the configuration in which one slit portion 127 is formed between the first resistance portion 126a and the second resistance portion 126b of the resistor 126 has been described. The slit part 127 may be formed.

  For example, as shown in FIG. 13, in a configuration in which five slit portions 127 are formed between the first resistance portion 126a and the second resistance portion 126b (configuration having a meandering current path in the resistor 126). There may be. FIG. 13 is a front view of a resistor corresponding to FIG.

  In this case, the first slit portion 127a is formed so as to extend from the upper end on the first through hole 101d side (upper left side in FIG. 13) formed at one corner of the upper end of the resistor 126 toward the lower end side. Further, the second slit portion 127b is formed so as to extend from the upper end on the second through hole 101e side (upper right side in FIG. 13) formed at the other corner of the upper end of the resistor 126 toward the lower end side.

  Then, third to fifth slit portions 127c, 127d, and 127e are formed between the first slit portion 127a and the second slit portion 127b so as to be parallel to the first and second slit portions 127a and 127b. Here, the third slit portion 127c is formed so as to extend from the upper end to the lower end side of the resistor 126, similarly to the first and second slit portions 127a and 127b, and the fourth and fifth slit portions 127d and 127e. May be formed so as to extend from the lower end of the resistor 126 toward the upper end side.

  According to this, the current paths of the resistance parts 126c to 127k between the first resistance part 126a and the second resistance part 126b meander, and the current flow directions of the current paths adjacent to each other can be opposite to each other. . Therefore, when a high-frequency current flows through the current path of the resistor 126, the magnetic field generated by the current is also in the opposite direction, and can be made to cancel each other.

  (8) In the above-described third embodiment, as shown in FIGS. 10 and 11, the current flowing through the first and second resistance portions 126a and 126b is directed downward on the plate surface of the first resistance portion 126a. Although it is described that it flows and flows upward in the plate surface of the second resistance portion 126b, the flow direction of the current flowing through the resistor 126 is not limited to this. For example, the current flowing through the first and second resistor portions 126a and 126b flows upward on the plate surface of the first resistor portion 126a and flows downward on the plate surface of the second resistor portion 126b. It may be configured. In this case, the connection resistor 126c is located on the upper end side of the resistor 126.

  Similarly, the current flowing through the first and second resistance portions 126a and 126b may be configured to flow in the left-right direction of the plate surfaces of the first and second resistance portions 126a and 126b. In any configuration, it is necessary to configure the current flow directions of the current flowing through the first resistance portion 126a and the current flowing through the second resistance portion 126b to be opposite to each other.

1 is an overall configuration diagram of a fuel cell system according to a first embodiment. It is a perspective view of the fuel cell of a 1st embodiment. It is an exploded view of the current measurement part assembly board of 1st Embodiment. It is sectional drawing of the electric current measurement part of 1st Embodiment. It is explanatory drawing which shows the flow of the electric current of the electric current measurement part of 1st Embodiment. It is explanatory drawing explaining the result of having measured alternating current impedance with an electric current measuring apparatus. It is sectional drawing of the electric current measurement part of 2nd Embodiment. It is a fragmentary sectional view of current measurement part collection board 100a of a 2nd embodiment. It is explanatory drawing which shows the flow of the electric current in sectional drawing of FIG. It is the schematic of the electric current measurement part of 3rd Embodiment. It is a front view of the resistor of a 3rd embodiment. It is explanatory drawing explaining the current flow of the resistor of the current measurement part of 3rd Embodiment. It is a front view of the resistor of other embodiments.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fuel cell 10a Cell 51 Current detection circuit 101 Current measurement part 101a Through hole 101b 1st blind via hole 101c 2nd blind via hole 102 Current measurement voltage sensor 110 1st printed circuit board 111 1st electrode 120 3rd printed circuit board 121 1st resistance Part (first and second embodiments)
126a 1st resistance part (3rd Embodiment)
126b 2nd resistance part (3rd Embodiment)
126c Connection resistor (third embodiment)
130 4th printed circuit board 131 2nd resistance part (1st, 2nd embodiment)
140 Second printed circuit board 141 Second electrode

Claims (7)

The present invention is applied to a fuel cell (10) configured by laminating and arranging a plurality of cells (10a) that output an electric energy by electrochemical reaction of an oxidant gas and a fuel gas. A current measuring device for measuring a flowing current,
A first electrode (111) disposed between the adjacent cells (10a) and electrically contacting one of the adjacent cells (10a), and the other cell of the adjacent cells (10a) A second electrode (141) that is in electrical contact with the first electrode, and a resistor that electrically connects the first electrode (111) and the second electrode (141) and has a predetermined electric resistance value. Two or more current measuring units (101);
A potential difference detecting means (102) for detecting a potential difference between two points of the resistor;
Current value detection means (51) for detecting a current value flowing through the cell (10a) using the resistance value between the two points of the resistor and the detected potential difference detected by the potential difference detection means (102). Prepared,
The resistor includes a first resistor part (121, 126a) electrically connected to the first electrode (111) side and a second resistor part electrically connected to the second electrode (141) side. (131, 126b)
The first resistor part (121, 126a) and the second resistor part (131, 126b) are electrically connected via a resistor connection part (101a) and the first resistor part (121, 126a). ) And the current flow direction in the second resistance part (131, 126b) are parallel to each other and opposite to each other ,
An insulating layer is provided between the first resistance part (121) and the second resistance part (131), and the first resistance part (121) is formed by the first electrode (111) in the insulating layer. The second resistance portion (131) is disposed on the second electrode (141) side in the insulating layer;
The current measurement unit (101) includes a configuration on the first electrode (111) side and a side on the second electrode (141) side between the first resistance unit (121) and the second resistance unit (131). The current measuring device is provided so as to be symmetrical with the configuration . The first electrode (111) is disposed on a first printed circuit board (110),
The second electrode (141) is disposed on the second printed circuit board (140),
The first printed circuit board (110) and the second printed circuit board (140) are integrally coupled as a laminated substrate with at least the first resistance part (121) and the second resistance part (131) sandwiched therebetween,
Between the first printed circuit board (110) and the second printed circuit board (140), a first connection part that electrically connects the first electrode (111) and the first resistance part (121). A wiring pattern for connecting (101b) to the potential difference detecting means (102), and a second connection part (101c) for electrically connecting the second electrode (141) and the second resistance part (131) A pair of printed circuit boards (120, 130) provided with a wiring pattern for connecting a voltage to the potential difference detecting means (102),
The pair of printed circuit boards (120, 130) are arranged with the first resistor portion (121) and the second resistor portion (131) sandwiched therebetween, and the wiring pattern is formed between the first resistor portion (121) and the first resistor portion. The current measuring device according to claim 1 , wherein the current measuring device is provided so as to be symmetrical with respect to a boundary between the two resistance portions (131). Of the pair of printed circuit boards (120, 130), the printed circuit board between the printed circuit board (120) on the first electrode (111) side and the first printed circuit board (110) and on the second electrode (141) side. The current measuring device according to claim 2 , wherein ferromagnetic materials (125, 135) are arranged between the substrate (130) and the second printed circuit board (140), respectively. A plurality of the current measuring units (101) are arranged between the same adjacent cells (10a), and the wiring patterns in the different current measuring units (101) are arranged between the plurality of current measuring units (101). The current measuring device according to claim 2 or 3 , wherein a gap (103) is provided for electrically separating each other. A plurality of the current measurement units (101) are arranged between the same adjacent cells (10a), and the plurality of current measurement units (101) are the first resistance units in the adjacent current measurement units (101). (121) and a current measuring device according to any one of claims 1 to 3 the flow direction of the current flowing through the second resistor section (131) is characterized in that it is arranged so as to be opposite to the direction . The insulating layer is any of claims 1 to 5, characterized in that said first resistor unit (121) and said second resistor unit (131) and thin-film insulating adhesive that bonds the (124) current measuring device according to one or. It said potential difference detection means (102), claims 1 and detects the potential difference between two points in one of the resistance portion of the first resistor section (121) and said second resistor unit (131) 6. The current measuring device according to claim 6.

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