JP4958450B2 - Fuel cell system - Google Patents

Description

  The present invention relates to a fuel cell system. More specifically, the present invention relates to a fuel cell system including a fuel cell capable of supplying electric power to a device including a power storage unit.

  A fuel cell is a device that generates electrical energy from fuel and oxidant, and can achieve high power generation efficiency. The main feature of a fuel cell is direct power generation that does not go through the process of thermal energy or kinetic energy as in the conventional power generation method. For this reason, fuel cells can be expected to have high power generation efficiency even on a small scale. In addition, since the emission of nitride compounds and the like is small and noise and vibration are small, environmental performance is improved. In this way, the fuel cell can effectively use the chemical energy of fuel and has environmentally friendly characteristics, so it is expected to be an energy supply system for the 21st century, from space use to automobiles and portable devices. It is attracting attention as a promising new power generation system that can be used in various applications from large-scale power generation to small-scale power generation, and technological development is in full swing toward practical use.

  In addition, as fuel cells are being reduced in size and weight, application development as a power source for portable devices is being promoted. For example, in recent years, a direct methanol fuel cell (DMFC) has attracted attention as one form of fuel cell. The DMFC directly supplies methanol to the anode without reforming the fuel, and obtains electric power through an electrochemical reaction between methanol and oxygen. Methanol has higher energy per unit volume than hydrogen, is suitable for storage, and has a low risk of explosion, etc., and is expected to be used as a power source for automobiles and portable devices.

  However, in fuel cells such as DMFC, the output may vary depending on the operating conditions. In particular, a fuel cell used as a power source for a portable device often moves with the portable device and is used under various operating conditions that change every moment.

  Therefore, in order to perform proper fuel cell operation even when the fuel cell operating conditions change, Patent Document 1 discloses that the temperature of the oxidizing gas supplied to the fuel cell is inhaled so as not to exceed a predetermined upper limit value. A fuel cell system control device that controls the operation of a fuel cell based on an oxidizing gas temperature and an atmospheric pressure value is disclosed.

Patent Document 2 discloses a fuel for notifying occurrence of an abnormality using a display device provided on the fuel cell side when an abnormality such as gas leakage occurs in a notebook personal computer equipped with a fuel cell. A battery unit is disclosed.
JP 2005-71939 A JP 2004-265834 A

By the way, when driving an electronic device such as a portable device using the fuel cell as a power source, it is conceivable to use the electric power not only for driving the electronic device but also for charging an electric storage means such as a secondary battery.

  However, if power generation is performed with the operating conditions of the fuel cell changing, the output may vary depending on the operating conditions, so a circuit that charges the power storage means needs a control circuit that reduces output fluctuations. there is a possibility. For example, when an electronic device powered by a fuel cell is brought into an airplane, a large change in atmospheric pressure occurs in the aircraft at takeoff and the operating conditions change, so the charging from the fuel cell to the storage means is restricted in the airplane. It is desirable.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique for appropriately controlling charging from the fuel cell to the power storage means.

In order to solve the above-described problems, a fuel cell system according to an aspect of the present invention includes a fuel cell that can supply power to an electronic device including a power storage unit, and the power generated by the fuel cell to the device. A control unit for controlling supply . The control unit charges the power storage means included in the device from the fuel cell based on a pressure decrease rate of the atmospheric pressure detected by a detection unit including a pressure sensor that detects an atmospheric pressure at which the fuel cell or the device is used. A control signal is output for control.
According to this aspect, the charging from the fuel cell to the power storage means can be controlled according to the environment in which the fuel cell or device is used. For example, it is detected that the environment in which the fuel cell is used has suddenly changed. In such a case, or when an environment in which charging to the power storage means by the fuel cell is not preferable is detected, charging from the fuel cell to the power storage means included in the device can be restricted.

In addition, the control unit is provided in the device, and the storage unit provided in the device from the fuel cell based on the information on the atmospheric pressure decrease rate from the detection unit that detects the information on the atmospheric pressure according to the environment in which the device is used. A control signal may be output in order to control charging of the battery.
According to this, since the charging from the fuel cell to the power storage means can be controlled according to the environment in which the fuel cell or device is used, for example, it has been detected that the environment in which the fuel cell is used has changed rapidly. In some cases, or when an environment in which charging of the power storage means by the fuel cell is not preferable is detected, charging from the fuel cell to the power storage means included in the device can be restricted. In addition, even when the fuel cell system is not provided with the detection unit, the control unit can control the charging from the fuel cell to the power storage means based on the information on the atmospheric pressure decrease rate from the detection unit provided in the device, The configuration of the fuel cell system can be simplified and the cost can be reduced.

Since the detection unit is composed of an atmospheric pressure sensor for detecting atmospheric pressure, it is possible to easily detect atmospheric pressure information corresponding to the environment in which the fuel cell or the device is used.

The control unit performs control to stop charging from the fuel cell to the power storage unit when the rate of decrease in the atmospheric pressure calculated based on the atmospheric pressure information detected by the atmospheric pressure sensor is greater than or equal to a reference value. According to this, when the fuel cell output is fluctuated due to environmental changes while the fuel cell system is moving together with the equipment, it is possible to prevent the fuel cell from continuing to be charged from the fuel cell as it is. Therefore, it is possible to suppress the deterioration of the power storage means due to charging in an unstable output state. In addition, when charging the fuel cell system from the fuel cell to the power storage means when using the fuel cell system on an airplane, set a reference value so that the rate of decrease in air pressure during takeoff is greater than or equal to the reference value. Thus, charging from the fuel cell to the power storage means can be stopped more reliably.

The control unit performs control to stop power generation by the fuel cell when the rate of decrease in the atmospheric pressure calculated based on the atmospheric pressure information detected by the atmospheric pressure sensor is equal to or higher than a reference value. According to this, when the output of the fuel cell changes due to environmental changes while the fuel cell system is moving together with the device, the power generation itself by the fuel cell is stopped, so that the power storage means can be more reliably removed from the fuel cell. It is possible to prevent the battery from being continuously charged. Therefore, it is possible to suppress the deterioration of the power storage means due to charging in an unstable output state. In addition, when charging the fuel cell system from the fuel cell to the power storage means when using the fuel cell system on an airplane, set a reference value so that the rate of decrease in air pressure during takeoff is greater than or equal to the reference value. Thus, power generation by the fuel cell is stopped after takeoff, and charging from the fuel cell to the power storage means can be stopped more reliably.

In order to solve the above-described problems, a fuel cell system according to an aspect of the present invention includes a fuel cell that can supply power to an electronic device including a power storage unit, and the power generated by the fuel cell to the device. A control unit for controlling supply. The control unit is configured to transfer the fuel cell to the power storage unit included in the device based on the acceleration detected by the detection unit including an acceleration sensor that detects the acceleration at which the fuel cell or the device is used and the duration of the acceleration. A control signal is output to control charging.
According to this aspect, the charging from the fuel cell to the power storage means can be controlled according to the environment in which the fuel cell or device is used. For example, it is detected that the environment in which the fuel cell is used has suddenly changed. In such a case, or when an environment in which charging to the power storage means by the fuel cell is not preferable is detected, charging from the fuel cell to the power storage means included in the device can be restricted.

In addition, the control unit is provided with the device, and charges the power storage unit provided in the device from the fuel cell based on information from a detection unit that detects acceleration information according to an environment in which the device is used. A control signal may be output for control.
According to this, since the charging from the fuel cell to the power storage means can be controlled according to the environment in which the fuel cell or device is used, for example, it has been detected that the environment in which the fuel cell is used has changed rapidly. In some cases, or when an environment in which charging of the power storage means by the fuel cell is not preferable is detected, charging from the fuel cell to the power storage means included in the device can be restricted. In addition, even when the fuel cell system is not provided with the detection unit, the control unit controls charging from the fuel cell to the power storage unit based on the acceleration from the detection unit provided in the device and the information on the duration of the acceleration. Therefore, the configuration of the fuel cell system can be simplified and the cost can be reduced.

Since the detection unit includes an acceleration sensor for detecting acceleration, it is possible to easily detect acceleration information according to the environment in which the fuel cell or the device is used.

  The control unit performs control to stop charging from the fuel cell to the power storage unit when a time during which the acceleration detected by the acceleration sensor is equal to or greater than a reference value continues for a reference time or longer. According to this, when the fuel cell output is fluctuated due to environmental changes while the fuel cell system is moving together with the equipment, it is possible to prevent the fuel cell from continuing to be charged from the fuel cell as it is. Therefore, it is possible to suppress the deterioration of the power storage means due to charging in an unstable output state. In addition, when the fuel cell system is used on an airplane, when charging from the fuel cell to the power storage means is restricted, the airplane has taken off if the acceleration continues for more than the reference time for more than the reference time This makes it possible to more reliably stop the charging from the fuel cell to the power storage means.

  The control unit performs control to stop the power generation by the fuel cell when the acceleration detected by the acceleration sensor continues for a reference time or longer for a time longer than a reference value. According to this, when the output of the fuel cell changes due to environmental changes while the fuel cell system is moving together with the device, the power generation itself by the fuel cell is stopped, so that the power storage means can be more reliably removed from the fuel cell. It is possible to prevent the battery from being continuously charged. Therefore, it is possible to suppress the deterioration of the power storage means due to charging in an unstable output state. In addition, when the fuel cell system is used on an airplane, when charging from the fuel cell to the power storage means is restricted, the airplane has taken off if the acceleration continues for more than the reference time for more than the reference time The power generation by the fuel cell is stopped after take-off and charging from the fuel cell to the power storage means can be stopped more reliably.

  The fuel may be methanol or an aqueous solution containing methanol. According to this, it is possible to provide a fuel cell system that is easy to carry with a simple configuration.

  A combination of the above-described elements as appropriate can also be included in the scope of the invention for which patent protection is sought by this patent application.

  According to the present invention, charging from the fuel cell to the power storage means can be appropriately controlled.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. In each of the following embodiments, a direct methanol fuel cell (DMFC) that is a solid polymer type is described as an example of a fuel cell, but the fuel cell is not limited to a DMFC, It is also possible to use phosphoric acid form, alkali form, molten carbonate form, solid oxide form and the like.

(First embodiment)
FIG. 1 is a diagram showing an overall configuration of a fuel cell system 10 and an electronic device 60 according to the first embodiment. The fuel cell system 10 can generate electric power by the reaction of fuel and supply electric power to a device including a switching unit that can switch between charging to the storage means, discharging from the storage means, and stopping of charging to the storage means. A fuel cell 20, a control unit 30 that controls the supply of power generated by the fuel cell 20 to a device, a pressure sensor 40 as a detection unit that detects information according to the environment in which the fuel cell 20 is used, And a DC / DC converter 50 for stably supplying the power generated by the fuel cell 20 to connected devices.

  The fuel cell 20 includes a fuel cell stack 202, a buffer tank 204, a fuel pump 206, an oxidant pump 208, a fuel tank 210, and a separation and recovery means 212.

  The fuel cell stack 202 generates electric power through an electrochemical reaction using a methanol solution and air. The fuel cell stack 202 may be a stacked type or a planar array type. Further, the fuel cell 20 may be a so-called passive fuel cell in which power units such as the fuel pump 206 and the oxidant pump 208 are omitted.

  The fuel tank 210 stores an aqueous methanol solution supplied to the fuel cell stack 202. The concentration of the aqueous methanol solution stored in the fuel tank 210 is adjusted by the buffer tank 204 and then supplied to the anode of the fuel cell stack 202 by the fuel pump 206.

  Unreacted fuel remaining after the reaction in the fuel cell stack 202 is recovered in the buffer tank 204 through the separation and recovery means 212. As described above, the aqueous methanol solution supplied to the fuel cell stack 202 circulates in the circulation system including the fuel cell stack 202 and the buffer tank 204. On the other hand, the oxidant pump 208 takes in air from the outside and supplies it to the cathode of the fuel cell stack 202. Products such as water and carbon dioxide generated by the reaction of methanol and air are separated and recovered by the separation and recovery means 212 and released to the outside, and water is recovered by the buffer tank 204, and the subsequent methanol Used for dilution.

  The fuel tank 210 stores a highly concentrated aqueous methanol solution having a higher concentration than the aqueous methanol solution stored in the buffer tank 204. For example, when the concentration of the methanol aqueous solution in the buffer tank 204 is 1 mol / L, the concentration of the high concentration methanol aqueous solution in the fuel tank 210 can be 22 mol / L.

  The control unit 30 controls driving units such as a pump and a valve constituting the fuel cell 20 according to the operation of the fuel cell 20. Further, the control unit 30 controls the DC / DC converter 50 for adjusting the power generated by the fuel cell 20 to the voltage of the electronic device 60 described later.

  The atmospheric pressure sensor 40 detects atmospheric pressure as an environment in which the fuel cell 20 is used. For example, a vibration type, a piezoresistive type, a capacitive type, or the like can be used. In the present embodiment, a piezoresistive semiconductor element whose electric resistance changes with pressure changes is used. Thereby, the pressure sensor 40 can be reduced in size and integrated. In addition, information corresponding to the environment in which the fuel cell 20 or the device is used can be easily detected.

  FIG. 2 is a cross-sectional view showing a schematic configuration of the piezoresistive semiconductor element. As shown in FIG. 2, the atmospheric pressure sensor 40 includes a glass substrate 402, a diaphragm 404, and wiring 406. A sealed space is provided between the glass substrate 402 and the diaphragm 404 and is almost in a vacuum. A sensor unit 404a made of a piezoresistive element is formed on the diaphragm 404. When pressure is applied and the diaphragm 404 is deformed, the resistance value of the piezoresistive element changes. The atmospheric pressure can be obtained by passing a current through the wiring 406 and measuring the voltage of the sensor unit 404a.

  Next, as an apparatus for supplying power from the fuel cell 20 according to the present embodiment, an electronic apparatus having a power storage unit, for example, a notebook PC will be described as an example. Other electronic devices to which the fuel cell 20 can be applied include a mobile phone, a portable terminal (PDA), a digital camera, and the like.

  The electronic device 60 stores power storage means 602 that can store electric power, and a charge / discharge circuit 604 as a switching circuit that switches between charging to the power storage means 602, discharging from the power storage means 602, and stopping charging to the power storage means. A management circuit 606 that manages the charge state of the power storage means 602 and other power consumption units and controls switching of the charge / discharge circuit 604, a CPU 608, a display unit 610, and a storage unit 612. . The CPU 608, the display unit 610, and the storage unit 612 are power consumption units. In the present embodiment, a control signal for controlling charging from the fuel cell 20 to the power storage unit 602 included in the electronic device 60 is output from the control unit 30 based on the information detected by the atmospheric pressure sensor 40, and the charging / discharging circuit 604 is output. Is input.

  As the power storage unit 602, a nickel-hydrogen secondary battery, a lithium ion secondary battery, a capacitor, or the like can be used. As the display portion 610, a liquid crystal, an organic EL, or the like can be used. As the storage unit 612, a hard disk drive, flash memory, RAM, ROM, or the like can be used.

  In the fuel cell system 10 according to the present embodiment, the control unit 30 controls charging of the power storage unit 602 included in the electronic device 60 from the fuel cell 20 based on the information on the atmospheric pressure detected by the atmospheric pressure sensor 40. Thereby, charging from the fuel cell 20 to the power storage means 602 can be controlled according to the environment in which the fuel cell 20 or the electronic device 60 is used. For example, the environment in which the fuel cell 20 is used changes rapidly. When it is detected, or when an environment in which charging of the power storage unit 602 by the fuel cell 20 is not preferable is detected, charging from the fuel cell 20 to the power storage unit 602 included in the electronic device 60 can be restricted. .

  For example, when an electronic device 60 such as a notebook PC equipped with the fuel cell system 10 is brought into an airplane, the fuel cell 20 provided in the fuel cell system 10 supplies the power storage means 602 provided in the electronic device 60 to the storage device 602 provided from the viewpoint of safety. Charging may be restricted. In such a case, it is only necessary for the user to take measures to stop charging from the fuel cell 20 to the power storage means 602 in advance, but it may happen that the user forgets to take the means.

  Therefore, in the fuel cell system 10 according to the present embodiment, the control unit 30 stores the power storage unit from the fuel cell 20 when the rate of decrease in the atmospheric pressure calculated based on the atmospheric pressure information detected by the atmospheric pressure sensor 40 is equal to or higher than the reference value. Control to stop charging to 602 is performed. In other words, the airplane will decrease from 1 atm to 0.8 atm over about 20 minutes after takeoff. In the meantime, the rate of decrease in atmospheric pressure changes in a range up to about 40 hPa / min. Therefore, if the reference value is equal to or greater than this range, it is estimated that the environment in which the fuel cell system 10 is used is in an airplane. be able to. Therefore, in order to prevent erroneous detection in other environments, the reference value may be set in the range of about 11 to 40 hPa / min.

  FIG. 3 is a flowchart showing charging stop control of the electronic device by the fuel cell system according to the present embodiment.

  As shown in FIG. 3, first, a signal based on atmospheric pressure information from the atmospheric pressure sensor 40 is acquired (S10). Then, the pressure reduction rate ΔP per unit time is calculated (S12) and compared with the reference value C1 (S14). When the pressure decrease rate ΔP is less than the reference value C1 (N in S14), it is determined that the environment is not in the airplane, and the process returns to S10. On the other hand, if the pressure decrease rate ΔP is greater than or equal to the reference value C1 (Y in S14), it is determined that the environment is in the airplane, and the control unit 30 stops charging from the fuel cell 20 to the power storage unit 602 (S16). ). The reference value C1 may be set so that the rate of decrease in atmospheric pressure at takeoff is equal to or higher than the reference value.

  According to the above configuration, when the output of the fuel cell 20 changes due to environmental changes while the fuel cell system 10 is moving together with the electronic device 60, the fuel cell 20 continues to charge the power storage means 602 as it is. Can be prevented. Therefore, it is possible to suppress the deterioration of the power storage means due to charging in an unstable output state. In addition, when the fuel cell system 10 is used on an airplane, when charging from the fuel cell 20 to the power storage means 602 is restricted, the reference value is set so that the rate of decrease in air pressure at takeoff is equal to or higher than the reference value. By setting, charging from the fuel cell 20 to the power storage unit 602 can be stopped more reliably.

  Further, instead of the above-described step S16, the control unit 30 stops the power generation by the fuel cell 20 when the rate of decrease in the atmospheric pressure calculated based on the atmospheric pressure information detected by the atmospheric pressure sensor 40 is equal to or higher than the reference value. Control may be performed. According to this, when the output of the fuel cell 20 changes due to environmental changes while the fuel cell system 10 is moving together with the electronic device 60, the power generation by the fuel cell 20 is stopped more reliably. It can be prevented that charging from the fuel cell 20 to the power storage means 602 is continued.

(Second Embodiment)
The fuel cell system 110 according to the second embodiment is greatly different in that an acceleration sensor 140 is provided instead of the atmospheric pressure sensor 40 in the fuel cell system 10 according to the first embodiment. In the following description, the same contents as those in the first embodiment will be omitted as appropriate.

  FIG. 4 is a diagram illustrating an overall configuration of the fuel cell system 110 and the electronic device 60 according to the second embodiment. The fuel cell system 110 uses an acceleration sensor 140 for detecting acceleration as a detection unit that detects information according to the environment in which the fuel cell 20 is used. According to this, the information according to the environment where the fuel cell 20 and the electronic device 60 are used can be easily detected.

  The acceleration sensor 140 detects acceleration as an environment in which the fuel cell 20 is used. For example, a piezoelectric type, a piezoresistive type, a conductive type, a strain gauge type, or the like can be used.

  In the fuel cell system 110 according to the present embodiment, the control unit 30 controls charging from the fuel cell 20 to the power storage unit 602 included in the electronic device 60 based on the acceleration information detected by the acceleration sensor 140. Thereby, charging from the fuel cell 20 to the power storage means 602 can be controlled according to the environment in which the fuel cell 20 or the electronic device 60 is used. For example, the environment in which the fuel cell 20 is used changes rapidly. When it is detected, or when an environment in which charging of the power storage unit 602 by the fuel cell 20 is not preferable is detected, charging from the fuel cell 20 to the power storage unit 602 included in the electronic device 60 can be restricted. .

  More specifically, in the fuel cell system 10 according to the present embodiment, the control unit 30 stores power from the fuel cell 20 when the acceleration detected by the acceleration sensor 140 is longer than a reference value for a reference time or longer. Control to stop charging to 602 is performed. In other words, an acceleration of 0.3 G or more takes some time during takeoff in the airplane. Therefore, by using the value of the acceleration sensor, it can be estimated that the environment in which the fuel cell system 10 is used is in an airplane.

  FIG. 5 is a flowchart showing charging stop control of the electronic device by the fuel cell system according to the present embodiment.

  As shown in FIG. 5, first, a signal based on acceleration information from the acceleration sensor 140 is acquired (S20). Then, the acceleration G is compared with a predetermined reference value C2 (S22). If the acceleration G is less than the reference value C2 (N in S22), it is determined that the environment is not in the airplane, and the process returns to S20. On the other hand, when the acceleration G is equal to or greater than the reference value C2 (Y in S22), the duration T during which the acceleration G is equal to or greater than the reference value C2 is calculated and compared with the reference time T0 (S24).

  If the duration T is less than the reference time T0 (N in S24), it is determined that the environment is not in an airplane, and the process returns to S20. On the other hand, when the duration T is equal to or longer than the reference time T0 (Y in S24), it is determined that the environment is in the airplane, and the control unit 30 stops the charging from the fuel cell 20 to the power storage unit 602 (S26). The reference value C2 may be set so that the acceleration G at takeoff is equal to or higher than the reference value.

  According to the above configuration, when the fuel cell system 110 moves together with the electronic device 60 and the output of the fuel cell 20 fluctuates due to environmental changes, the fuel cell 20 continues to charge the power storage means 602 as it is. Can be prevented. Therefore, it is possible to suppress the deterioration of the power storage means due to charging in an unstable output state. In addition, when the fuel cell system 110 is used on an airplane, when charging from the fuel cell 20 to the power storage unit 602 is restricted, charging from the fuel cell 20 to the power storage unit 602 can be stopped more reliably. it can.

  In addition, instead of the above-described step S26, the control unit 30 determines that the fuel cell 20 is in the case where the acceleration calculated based on the acceleration information detected by the acceleration sensor 140 continues for a reference time or longer. You may perform control which stops the electric power generation by. According to this, when the fuel cell system 110 is moving together with the electronic device 60 and the output of the fuel cell 20 varies due to environmental changes, the power generation itself by the fuel cell 20 is stopped more reliably. It can be prevented that charging from the fuel cell 20 to the power storage means 602 is continued.

(Third embodiment)
The fuel cell system 220 according to the third embodiment uses an acceleration sensor 614 included in the electronic device 60 instead of using information from the acceleration sensor 140 included in the fuel cell system 110 according to the second embodiment. The point of using information is very different. In the following description, the same contents as those in the first embodiment and the second embodiment will be omitted as appropriate.

  FIG. 6 is a diagram illustrating an overall configuration of the fuel cell system 220 and the electronic device 160 according to the third embodiment. In the fuel cell system 220 according to the present embodiment, the control unit 30 is based on information from the acceleration sensor 614 serving as a detection unit that detects information according to the environment in which the electronic device 160 is used and the electronic device 160 is used. It controls charging from the fuel cell 20 to the power storage means 602 included in the electronic device 160. According to this, the information according to the environment where the fuel cell 20 and the electronic device 60 are used can be easily detected.

  As the acceleration sensor 614 provided in the electronic device 160, for example, an acceleration sensor provided in the hard disk drive as a countermeasure against dropping impact, or an acceleration sensor provided in a camera such as a digital camera or PDA as an anti-shake function can be used.

  According to this, since the charging from the fuel cell 20 to the power storage means 602 can be controlled according to the environment in which the fuel cell 20 or the electronic device 160 is used, for example, the environment in which the fuel cell 20 is used is rapidly increased. When it is detected that the charging has been changed to the above, or when an environment in which charging of the power storage unit 602 by the fuel cell 20 is not preferable is detected, charging of the power storage unit 602 included in the electronic device 160 from the fuel cell 20 is limited. Can do. Further, even when the fuel cell system 220 is not provided with the acceleration sensor, the control unit 30 may control charging from the fuel cell 20 to the power storage unit 602 based on information from the acceleration sensor 614 provided in the electronic device 160. Therefore, the configuration of the fuel cell system 220 can be simplified and the cost can be reduced.

  The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added based on the knowledge of those skilled in the art. The form can also be included in the scope of the present invention.

  For example, in the above-described third embodiment, the case of the acceleration sensor 614 as the detection unit provided in the electronic device 160 has been described, but an atmospheric pressure sensor may be used instead.

  Further, the fuel cell system may include a GPS receiver as a detection unit that detects information according to the environment. As a result, the position of the usage environment can be accurately determined, and charging from the fuel cell to the power storage means can be controlled more accurately.

1 is a diagram illustrating an overall configuration of a fuel cell system and an electronic device according to a first embodiment. It is sectional drawing which shows schematic structure of a piezoresistive type semiconductor element. It is a flowchart which shows charge stop control of the electronic device by the fuel cell system which concerns on 1st Embodiment. It is a figure which shows the whole structure of the fuel cell system and electronic device which concern on 2nd Embodiment. It is a flowchart which shows charge stop control of the electronic device by the fuel cell system which concerns on 2nd Embodiment. It is a figure which shows the whole structure of the fuel cell system and electronic device which concern on 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Fuel cell system, 20 Fuel cell, 30 Control part, 40 Atmospheric pressure sensor, 50 DC / DC converter, 60 Electronic device, 110 Fuel cell system, 140 Acceleration sensor, 160 Electronic device, 202 Fuel cell stack, 204 Buffer tank, 206 Fuel pump, 208 Oxidant pump, 210 Fuel tank, 212 Separation and recovery means, 220 Fuel cell system, 602 Power storage means, 604 Charge / discharge circuit, 606 Management circuit, 608 CPU, 610 Display section, 612 Storage section, 614 Acceleration Sensor.

Claims (3)

A fuel cell capable of supplying power to an electronic device including a power storage means ;
A control unit for controlling supply of the electric power generated by the fuel cell to the device ,
The control unit charges the power storage means included in the device from the fuel cell based on a pressure decrease rate of the atmospheric pressure detected by a detection unit including a pressure sensor that detects an atmospheric pressure at which the fuel cell or the device is used. Output a control signal to control,
A fuel cell system. A fuel cell capable of supplying power to an electronic device including a power storage means;
A control unit for controlling supply of the electric power generated by the fuel cell to the device,
The control unit is configured to transfer the fuel cell to the power storage unit included in the device based on the acceleration detected by the detection unit including an acceleration sensor that detects the acceleration at which the fuel cell or the device is used and the duration of the acceleration. Output control signals to control charging,
A fuel cell system. The fuel cell system according to claim 1, wherein the fuel is methanol.

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