JP2013090411A - Fuel cell system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell system which can prevent a relay installed in a power supply path from getting melted and stuck without incurring an increase in power consumption by the addition of a new resistor or coil.SOLUTION: A relay R1 of a fuel cell system 1 comprises: a first fixed terminal 61 which is connected to an FC converter 3; a second fixed terminal 62 which is disposed apart from the first fixed terminal 61 and is connected to a traction motor 4; and a movable terminal 631 actuated by excitation of a relay coil 64 to establish or break the electrical connection between the first fixed terminal 61 and the second fixed terminal 62. A core member 7 consisting of a ferromagnetic body is disposed so as to penetrate the inside of a wound path running from the first fixed terminal 61 through the movable terminal 631 to the second fixed terminal 62 in which a current circles round while the first fixed terminal 61 and the second fixed terminal 62 are electrically connected.

Description

  The present invention relates to a fuel cell system.

  2. Description of the Related Art A fuel cell system that supplies electric power from a fuel cell to a load such as an automobile motor is known. In the following Patent Document 1, a DC / DC converter as a voltage conversion unit is arranged between a fuel cell and a load, and after the DC / DC converter boosts a DC voltage supplied from the fuel cell. A fuel cell system configured to supply power to a load is described. Further, in the fuel cell system described in Patent Document 1 below, a relay is arranged in a path for supplying power from the DC / DC converter to the load, and connection and disconnection of the path can be switched.

  In a fuel cell system having a configuration in which a relay is arranged in a path for supplying power to a load, for example, when the relay is closed in a state where a high potential difference is generated between the load side and the fuel cell side when viewed from the relay, At that moment, a large current flows through the relay. When such a large current flows, a so-called welding phenomenon occurs in which the contact portion between the fixed terminal and the movable terminal inside the relay is melted by Joule heat and fixed to each other.

  When the relay is welded, the current path inside the relay is always closed, so that the relay cannot be operated. As one of the measures for preventing the occurrence of welding, a method of energizing the movable terminal so that the contact pressure of the relay is increased and reducing the contact resistance when the movable terminal and the fixed terminal are in contact with each other is known. It has been. However, in this case, since the movable terminal needs to operate against the urging force, the current flowing through the relay coil to operate the movable terminal increases. This is not desirable from the viewpoint of efficient use of power.

  Therefore, in the fuel cell system described in Patent Document 1 below, in a part of the current path where the relay is arranged, a current limiting resistor is arranged in parallel with a part of the current path, and the current passing through the current limiting resistor The path and the current path that does not pass through can be switched by a switch. When there is a high potential difference between the load side and the fuel cell side when viewed from the relay, that is, when there is a possibility that welding will occur due to a large current, switch the switch so that the current path passes through the current limiting resistor. By closing the relay after switching, the generation of large current is suppressed and the occurrence of welding is prevented.

JP 2010-288326 A

  In the fuel cell system described in Patent Document 1, when there is a possibility of welding, the generation of a large current is suppressed by a current limiting resistor, while there is no possibility of welding (load side) When the potential difference between the fuel cell and the fuel cell is small), the current path is switched to a current path that does not pass through the current limiting resistor.

  However, since a potential sensor for constantly monitoring the potential difference between the load side and the fuel cell side is required and the control of the changeover switch is also necessary, electric power for operating these is separately required. there were. Furthermore, for example, when a large current flows through the relay due to a short circuit of the load, the operation of the changeover switch may not be in time, and the occurrence of welding cannot be completely prevented.

  As a configuration for suppressing a large current due to a short circuit of the load, it is conceivable to separately connect a coil instead of a resistor in a path for supplying power to the load. Since rapid fluctuations in current are suppressed by the inductance of the coil, it is possible to reliably prevent a large current from flowing through the relay even when a load short circuit occurs. In addition, power loss due to coil inductance occurs only in a transient state when a load-side short circuit occurs, and does not occur after the current becomes constant.

  However, a coil capable of flowing a large current that is generated when the load is short-circuited is large in size, and has a large DC resistance component as well as an inductance. For this reason, although generation | occurrence | production of welding can be prevented, the problem that useless power consumption increases will still arise.

  This invention is made | formed in view of such a subject, The objective is to weld the relay provided in the electric power supply path, without increasing power consumption by adding a new resistance and a coil. It is an object of the present invention to provide a fuel cell system that can be prevented.

  In order to solve the above problems, a fuel cell system according to the present invention includes a fuel cell that receives supply of a fuel gas and an oxidizing gas, and generates electric power by an electrochemical reaction between the fuel gas and the oxidizing gas, and an electric power from the fuel cell. A power consuming device that consumes power, and a voltage that is arranged between the fuel cell and the power consuming device, and boosts the DC voltage of the power input from the fuel cell and then supplies the power to the power consuming device A converter, and a relay device that connects or cuts off a path for supplying power from the voltage converter to the power consuming device, the relay device including a first fixed terminal connected to the voltage converter; The first fixed terminal and the second fixed terminal are arranged apart from the first fixed terminal and operated by excitation of a relay coil and a second fixed terminal connected to the power consuming device. A movable terminal that switches between electrical connection and disconnection with the terminal, wherein the first fixed terminal and the second fixed terminal are electrically connected by the movable terminal. A core member made of a ferromagnetic material is disposed so as to penetrate the inside of a winding path through which a current from the first fixed terminal to the second fixed terminal passes through the movable terminal. Yes.

  According to the present invention, the relay is formed as a winding path (that is, a coil) around which current is wound by the first fixed terminal, the movable terminal, and the second fixed terminal, which are components conventionally provided. An existing current path is used, and the inductance of the winding path (coil) is increased by a core member made of a ferromagnetic material. For this reason, it is possible to reliably prevent the occurrence of welding because only the inductance is increased without adding a new resistor or coil, that is, without increasing the electrical resistance of the current path in which the relay is arranged. .

  In the fuel cell system according to the present invention, in the state where the first fixed terminal and the second fixed terminal are electrically connected, the number of turns of the winding path is 1 or more. It is also preferable that at least one of the first fixed terminal and the second fixed terminal has a bent portion.

  In this preferable aspect, the number of turns of the winding path formed by the first fixed terminal, the movable terminal, and the second fixed terminal is 1 or more, and the core member made of a ferromagnetic material is disposed so as to penetrate this winding circuit. Has been. The inductance of the winding path (coil) increases in proportion to the number of windings of the current path for the core member made of a ferromagnetic material. Therefore, the inductance can be increased by a simple configuration in which a bent portion is provided in at least one of the first fixed terminal and the second fixed terminal, and the occurrence of welding can be more reliably prevented.

  In the fuel cell system according to the present invention, it is preferable that the core member is formed in an annular shape so as to form a closed magnetic flux path, and is arranged so as to be linked to the winding path.

  In this preferable aspect, the magnetic flux generated when a current flows through the winding path constituted by the first fixed terminal, the movable terminal, and the second fixed terminal is generated inside the core member formed as an annular magnetic flux path. Most of the magnetic flux is generated and almost no leakage magnetic flux is generated outside the core member. As a result, since the inductance of the winding path constituted by the first fixed terminal, the movable terminal, and the second fixed terminal is further increased, the occurrence of welding can be more reliably prevented.

  In the fuel cell system according to the present invention, the core member formed in an annular shape is formed by combining a first core member and a second core member, both of which are E-shaped in cross section and symmetrical to each other. It is also preferable.

  In this preferred embodiment, the annularly configured core member can be easily formed by a simple configuration in which the first core member and the second core member each having an E-shaped cross section and symmetrical shapes are combined. it can.

  According to the present invention, it is possible to provide a fuel cell system capable of preventing welding of a relay provided on a power supply path without increasing power consumption by adding a new resistor or coil. .

It is a figure which shows typically the structure of the fuel cell system which is embodiment of this invention. It is sectional drawing which shows the internal structure of the relay shown in FIG. It is a figure which shows an example of arrangement | positioning of the 1st fixed terminal, the 2nd fixed terminal, a movable terminal, and a core member in the inside of the relay shown in FIG. It is a figure which shows another example of arrangement | positioning of the 1st fixed terminal, the 2nd fixed terminal, a movable terminal, and a core member in the inside of the relay shown in FIG. It is a figure which shows another example of arrangement | positioning of the 1st fixed terminal, the 2nd fixed terminal, a movable terminal, and a core member in the inside of the relay shown in FIG. It is a figure which shows the structure of the core member shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  First, a preferred embodiment of a fuel cell system according to the present invention will be described with reference to FIG. In the embodiment, a case where the fuel cell system according to the present invention is used as an on-vehicle power generation system of a fuel cell vehicle will be described. The fuel cell system according to the present invention can also be applied to various mobile bodies (robots, ships, aircrafts, etc.) other than fuel cell vehicles, and further used as power generation equipment for buildings (housing, buildings, etc.). It can be applied to a stationary power generation system.

  FIG. 1 is a diagram schematically showing a configuration of a fuel cell system according to an embodiment of the present invention. As shown in FIG. 1, a fuel cell system 1 includes a fuel cell 2 that generates electric power by an electrochemical reaction between an oxidizing gas that is a reaction gas and a fuel gas, and an FC converter 3 that is a DC / DC converter for the fuel cell. A traction motor 4 (power consuming device) as a load, and a control unit 5 that performs overall control of the entire system.

  The fuel cell 2 is, for example, a polymer electrolyte fuel cell, and has a stack structure in which a large number of single cells are stacked. The single cell has an air electrode on one surface of an electrolyte membrane made of an ion exchange membrane, a fuel electrode on the other surface, and a pair of separators so as to sandwich the air electrode and the fuel electrode from both sides. It has become. In this case, hydrogen gas is supplied to the hydrogen gas passage of one separator, the oxidizing gas is supplied to the oxidizing gas passage of the other separator, and electric power is generated by the chemical reaction of these reaction gases.

  The FC converter 3 is a DC voltage converter, and has a function of outputting (supplying) the electric power input from the fuel cell 2 to the traction motor 4 after boosting the DC voltage. The output voltage of the fuel cell 2 is controlled by the FC converter 3. On the output side of the FC converter 3, a voltage sensor V <b> 1 that detects the output voltage of the FC converter 3 and a relay R <b> 1 that connects or cuts off a power supply path that supplies power to the traction motor 4 are disposed.

  The control unit 5 detects an operation amount of an acceleration operation member (for example, an accelerator) provided in the fuel cell vehicle, and controls an acceleration request value (for example, a required power generation amount from a power consuming device such as the traction motor 4). Receives information and controls the operation of various devices in the system. In addition to the traction motor 4, the power consuming device includes, for example, auxiliary equipment required for operating the fuel cell 2, various devices (transmission, wheel control device, steering device, Actuators used in suspension systems, etc., passenger space air conditioners (air conditioners), lighting, audio, etc.

  The control unit 5 physically includes, for example, a CPU, a memory, and an input / output interface. The memory includes a ROM that stores a control program and control data processed by the CPU, and a RAM that is mainly used as various work areas for control processing. These elements are connected to each other via a bus. Various sensors such as a voltage sensor are connected to the input / output interface, and various drivers for driving the traction motor 4 and the like are connected.

  The CPU receives the detection results of the various sensors via the input / output interface according to the control program stored in the ROM, and processes them using various data in the RAM, whereby various control processes in the fuel cell system 1 are performed. Execute. Further, the CPU controls the entire fuel cell system 1 by outputting control signals to various drivers via the input / output interface.

  In addition to the above, the control unit 5 controls ON (closed state) / OFF (open state) of the relay R1. Specifically, the control is performed as follows. During the start-up of the fuel cell system 1 (at this time, the relay R1 is in an open state), the control unit 5 gradually increases the open circuit voltage (OCV) of the FC converter 3 until it reaches a predetermined value or more. Relay R1 is kept open. The power supply to the load such as the traction motor 4 during this period is performed by a battery system (not shown).

  When the open circuit voltage (OCV) of the FC converter 3 rises to a predetermined position or more, the control unit 5 controls the relay R1 to be in a closed state. Thereby, power supply from the fuel cell 2 to the traction motor 4 is started. Thereafter, power is supplied to the traction motor 4 from both the fuel cell 2 and the battery system. In addition to supplying power to the traction motor 4, the battery system has a role of storing surplus power from the fuel cell 2 when the required power of the traction motor 4 is suddenly reduced and a role of storing regenerative energy from the brake system. Also plays.

  Next, a specific structure of the relay R1 will be described with reference to FIG. FIG. 2 is a cross-sectional view showing the internal structure of the relay R1. The relay R1 includes a first fixed terminal 61, a second fixed terminal 62, a movable member 63, and a relay coil 64.

  The first fixed terminal 61 is an electrode terminal made of metal formed in a rod shape and connected to the FC converter 3. The first fixed terminal 61 is fixed in a state of penetrating the top plate 65 of the relay R1 and projecting downward from the top plate 65. The first fixed terminal 61 and the top plate 65 are electrically insulated.

  The second fixed terminal 62 is an electrode terminal made of a metal formed in the same shape as the first fixed terminal 61 and connected to the traction motor 4. Similar to the first fixed terminal 61, the second fixed terminal 62 passes through the top plate 65 of the relay R <b> 1 and is fixed in a state of protruding downward from the top plate 65. The second fixed terminal 62 and the top plate 65 are electrically insulated.

  The movable member 63 includes a movable terminal 631, a shaft portion 632, and a movable iron core 633, and is arranged so as to be movable up and down in FIG. The movable terminal 631 is a flat terminal formed of a conductive member. When the movable member 63 moves upward, the movable terminal 631 comes into contact with both the first fixed terminal 61 and the second fixed terminal 62, and the first fixed terminal 61 and the second fixed terminal 62 are electrically connected. It becomes a state. On the other hand, when the movable member 63 moves downward, the movable terminal 631 is not in contact with either the first fixed terminal 61 or the second fixed terminal 62, so the first fixed terminal 61 and the second fixed terminal. 62 is electrically cut off.

  The shaft portion 632 is a rod-like member whose upper end is fixed to the movable terminal 631, and is disposed in a state of penetrating a partition wall 67 formed so as to divide the interior of the relay R1 into two upper and lower chambers. A movable iron core 633 is fixed to the lower end of the shaft portion 632 below the partition wall 67.

  A contact pressure spring 8 is disposed between the movable terminal 631 and the partition wall 67 so as to penetrate the shaft portion 632. The contact spring 8 has an upper end in contact with the movable terminal 631 and a lower end in contact with the partition wall 67, and urges the movable terminal 631 upward.

  A rod-shaped core member 7 is disposed above the movable terminal 631 and between the first fixed terminal 61 and the second fixed terminal 62. That is, the core member 7 is disposed so as to penetrate a surface defined by the first fixed terminal 61, the second fixed terminal 62, and the movable terminal 631. In other words, in a state where the first fixed terminal 61 and the second fixed terminal 62 are electrically connected by the movable terminal 631, the connection from the first fixed terminal 61 to the second fixed terminal 62 through the movable terminal 631. A letter-shaped current path (a winding path with a winding number of 0.5) is formed, and the core member 7 is disposed so as to penetrate the inside of the winding path (FIG. 3). The core member 7 is made of permalloy that is a ferromagnetic material. Thus, the effect of arranging the core member 7 formed of a ferromagnetic material will be described later.

  The relay coil 64 is a coil disposed below the partition wall 67 inside the relay R1. The relay coil 64 is formed by winding a conducting wire around a bobbin 66 whose axial direction coincides with the axial direction of the shaft portion 632. For this reason, when an electric current is passed through the relay coil 64, a magnetic flux penetrating the hollow portion 661 of the bobbin 66 in the vertical direction is generated.

  The bobbin 66 is disposed so that the movable iron core 633 of the movable member 63 is positioned in the hollow portion 661. In the hollow portion 661, a fixed iron core 68 is disposed below the movable iron core 633. The lower end of the fixed iron core 68 is fixed to the bottom plate 69 of the relay R1.

  Both the movable iron core 633 and the fixed iron core 68 are formed of iron which is a ferromagnetic material. For this reason, when a current flows through the relay coil 64 and a magnetic flux passing through the hollow portion 661 in the vertical direction is generated, an attractive force acts between the movable iron core 633 and the fixed iron core 68.

  The operation of the relay R1 will be described with continued reference to FIG. In a state where no current flows through the relay coil 64, the movable member 63 moves upward by the biasing force of the contact pressure spring 8, and the movable terminal 631 is at the lower end of each of the first fixed terminal 61 and the second fixed terminal 62. It is in a state of being pressed against. That is, in a state where no current flows through the relay coil 64, the first fixed terminal 61 and the second fixed terminal 62 are electrically connected (closed state), so the relay R1 is a normally closed type. Relay.

  When the control unit 5 controls the relay R1 to be OFF (open state), current is supplied to the relay coil 64 from a current supply unit (not shown), and a magnetic flux penetrating the hollow portion 661 in the vertical direction is generated. As a result, the movable member 63 receives a force downward due to the suction force acting between the movable iron core 633 and the fixed iron core 68. Since this force is larger than the force that the movable terminal 631 receives from the contact pressure spring 8 upward, the movable member 63 moves downward.

  When the movable member 63 moves downward, the movable terminal 631 is in a non-contact state with respect to both the first fixed terminal 61 and the second fixed terminal 62, so that the first fixed terminal 61 and the second fixed terminal 62 Is electrically disconnected (open state). As described above, the opening / closing operation of the relay R1 is performed based on the same principle as the operation of a general relay.

  The relay R1 of this embodiment is different from the conventional relay in that the core member 7 is disposed above the movable terminal 631 and between the first fixed terminal 61 and the second fixed terminal 62. As shown in FIG. 3, in a state where the movable terminal 631 is in contact with the first fixed terminal 61 and the second fixed terminal 62, the connection from the first fixed terminal 61 to the second fixed terminal 62 through the movable terminal 631. A letter-shaped current path (a winding path having a winding number of 0.5) is formed, and the core member 7 is disposed so as to penetrate the inside of the winding path.

  As can be seen from FIG. 3, the U-shaped current path can be said to be a coil having a winding number of 0.5 formed around the core member 7 which is a ferromagnetic material. The inductance of the coil is proportional to both the number of turns and the magnetic permeability of the core member 7. In the present embodiment, the number of turns is relatively small at 0.5, but the core member 7 is made of permalloy having a very large magnetic permeability. For this reason, the inductance of the coil is sufficient to prevent a rapid increase in current flowing through the first fixed terminal 61, the movable terminal 631, and the second fixed terminal 62 when a load short circuit occurs, and to prevent welding. It is a big size.

  As described above, the relay R1 of the present embodiment has an existing current path formed by the first fixed terminal 61, the second fixed terminal 62, and the movable terminal 631, which are components conventionally provided by the relay. Utilizing this, the inductance of the coil formed by this current path is made large by the core member 7 made of a ferromagnetic material. For this reason, without adding a new resistor or coil, that is, without increasing the electrical resistance of the current path in which the relay R1 is arranged, only the inductance can be increased and the occurrence of welding can be reliably prevented. .

  Next, an embodiment different from the above will be described regarding the arrangement of the first fixed terminal, the second fixed terminal, the movable terminal, and the core member inside the relay. Other configurations are the same as those in the above embodiment, and thus the description thereof is omitted below.

  As shown in FIG. 4, in the relay R1a according to this embodiment, the first fixed terminal 61a and the second fixed terminal 62a are both formed to have bent portions. The first fixed terminal 61a includes a first upper terminal 611a, a first horizontal bus bar 612a, and a first lower terminal 613a.

  The first upper terminal 611a is made of metal formed in a rod shape, and is fixed in a state of penetrating the top plate 65 of the relay R1a and projecting downward from the top plate 65. The first upper terminal 611a and the top plate 65 are electrically insulated.

  The first horizontal bus bar 612a is a metal plate arranged horizontally. One end of the first horizontal bus bar 612a is fixed to the lower end of the first upper terminal 611a, and the other end is fixed to the upper end of the first lower terminal 613a.

  The first lower terminal 613a is made of a metal formed in the same shape as the first upper terminal 611a, and is fixed in a state of projecting downward from the first horizontal bus bar 612a. The lower end of the first lower terminal 613a is a portion that contacts the movable terminal 631 when the movable member 63 moves upward. Thus, the 1st fixed terminal 61a has the 1st horizontal bus-bar 612a which is a bending part between the 1st upper terminal 611a and the 1st lower terminal 613a.

  The second fixed terminal 62a includes a second upper terminal 621a, a second horizontal bus bar 622a, and a second lower terminal 623a. The second upper terminal 621a is made of metal formed in a rod shape, and is fixed in a state of penetrating the top plate 65 of the relay R1a and projecting downward from the top plate 65. The second upper terminal 621a and the top plate 65 are electrically insulated.

  The second horizontal bus bar 622a is a metal plate arranged horizontally. One end of the second horizontal bus bar 622a is fixed to the lower end of the second upper terminal 621a, and the other end is fixed to the upper end of the second lower terminal 623a.

  The second lower terminal 623a is made of metal formed in the same shape as the second upper terminal 621a, and is fixed in a state of protruding downward from the second horizontal bus bar 622a. The lower end of the second lower terminal 623a is a portion that comes into contact with the movable terminal 631 when the movable member 63 moves upward. Thus, the 2nd fixed terminal 62a has the 2nd horizontal bus-bar 622a which is a bending part between the 2nd upper terminal 621a and the 2nd lower terminal 623a.

  As shown in FIG. 4, the first horizontal bus bar 612a and the second horizontal bus bar 622a are arranged at the same height and in parallel with each other. The direction in which the first horizontal bus bar 612a extends from the first upper terminal 611a is opposite to the direction in which the second horizontal bus bar 622a extends from the second upper terminal 621a. As a result, in the state where the first fixed terminal 61a, the movable terminal 631, and the second fixed terminal 62a are electrically connected, the number of turns of the winding path formed by these is 1. That is, a coil with one winding is formed.

  The core member 7 formed by permalloy is disposed between the first lower terminal 613a and the second lower terminal 623a. That is, the core member 7 is arranged so as to penetrate the coil having the number of turns of 1 formed by the first fixed terminal 61a, the movable terminal 631, and the second fixed terminal 62a.

  As described above, in the relay R1a of the present embodiment, the first fixed terminal 61a and the second fixed terminal 62a are formed by the first fixed terminal 61a, the movable terminal 631, and the second fixed terminal 62a by having a bent portion. The number of turns of the formed coil is increased from 0.5 to 1. As mentioned earlier, the coil inductance is proportional to the number of turns. Therefore, the inductance of the relay R1a is doubled by a simple configuration in which bent portions are provided in the first fixed terminal 61a and the second fixed terminal 62a, and the occurrence of welding can be more reliably prevented. Yes.

  In the relay R1a of the present embodiment, an example in which one bent portion is provided in each of the first fixed terminal 61a and the second fixed terminal 62a and the number of turns of the coil is 1 was introduced. The present invention is not limited to this, and the number of turns of the current path around the core member 7 may be larger than 1 by providing a plurality of bent portions. In this case, in proportion to the increase in the number of turns, the inductance of the coil formed by the first fixed terminal 61a, the movable terminal 631, and the second fixed terminal 62a can be further increased to prevent the occurrence of welding more reliably. it can.

  Further, in the relay R1 and the relay R1a described above, the example in which the core member 7 has a rod shape has been described. The present invention is not limited to this, and the core member may be formed in an annular shape. An example of the core member 7a having such a shape will be described with reference to FIGS.

  FIG. 5 is obtained by replacing the core member 7 with an annular core member 7a in the configuration of the relay R1a shown in FIG. FIG. 6 is a view showing the structure of the core member 7a. As shown in FIG. 6, the core member 7 a is formed by combining a first core member 71 a and a second core member 72 a having an E-shaped cross section and a symmetrical shape, and has two openings 73 and 74. have. In other words, the core member 7 a is formed to have two annular portions 75 and 76.

  As shown in FIG. 5, the core member 7 a is arranged inside the relay R <b> 1 a so that the first lower terminal 613 a penetrates the opening 73 and the second lower terminal 623 a penetrates the opening 74. As a result, the coil formed by the first fixed terminal 61a, the movable terminal 631, and the second fixed terminal 62a is linked to both the annular portions 75 and 76 of the core member 7a.

  By arranging the annular core member 7a in this way, the magnetic flux generated when a current flows through the current path constituted by the first fixed terminal 61a, the movable terminal 631, and the second fixed terminal 62a is changed into the annular magnetic flux. Most of the magnetic flux is generated inside the core member 7a formed as a path, and almost no leakage magnetic flux is generated outside the core member 7a. As a result, since the inductance of the current path constituted by the first fixed terminal 61a, the movable terminal 631, and the second fixed terminal 62a is further increased, the occurrence of welding can be prevented more reliably.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

1: Fuel cell system 2: Fuel cell 3: FC converter 4: Traction motor 5: Control unit 7, 7a: Core member 8: Contact pressure spring 61, 61a: First fixed terminal 611a: First upper terminal 612a: First Horizontal bus bar 613a: first lower terminal 62, 62a: second fixed terminal 621a: second upper terminal 622a: second horizontal bus bar 623a: second lower terminal 63: movable member 631: movable terminal 632: shaft portion 633: movable Iron core 64: Relay coil 65: Top plate 66: Bobbin 661: Hollow portion 67: Bulkhead 68: Fixed iron core 69: Bottom plate 71a: First core member 72a: Second core member 73, 74: Openings 75, 76: Annular part R1, R1a: Relay V1: Voltage sensor

Claims (4)

A fuel cell that receives supply of a fuel gas and an oxidizing gas, and generates power by an electrochemical reaction of the fuel gas and the oxidizing gas;
A power consuming device that consumes power from the fuel cell;
A voltage conversion unit disposed between the fuel cell and the power consuming device and supplying the electric power input from the fuel cell to the power consuming device after boosting its DC voltage;
A relay device for connecting or blocking a path for supplying power from the voltage conversion unit to the power consuming device,
The relay device is
A first fixed terminal connected to the voltage converter;
A second fixed terminal disposed apart from the first fixed terminal and connected to the power consuming device;
A movable terminal that switches between electrical connection and disconnection between the first fixed terminal and the second fixed terminal by operating by excitation of a relay coil,
In a state where the first fixed terminal and the second fixed terminal are electrically connected by the movable terminal, a current from the first fixed terminal through the movable terminal to the second fixed terminal is wound. A fuel cell system, wherein a core member made of a ferromagnetic material is disposed so as to penetrate the inside of a winding path.   In a state where the first fixed terminal and the second fixed terminal are electrically connected, the first fixed terminal and the second fixed terminal are set so that the number of turns of the winding path is 1 or more. 2. The fuel cell system according to claim 1, wherein at least one of the two has a bent portion.   The said core member is cyclically | annularly formed so that the closed magnetic flux path may be formed, and is arrange | positioned so that the said winding path | route may be linked, The Claim 1 or Claim 2 characterized by the above-mentioned. Fuel cell system.   The core member formed in an annular shape is formed by combining a first core member and a second core member, both of which are E-shaped in cross section and symmetrical to each other. The fuel cell system described in 1.

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