DC power source with fuel cell and electric power storage device
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiroshi Sugiura, Tetsuhiro Ishikawa, Nobuo Watanabe, Kouta Manabe
Life of this patent
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Abstract
A power source system (1) includes a fuel cell (40) and a battery (20) connected in parallel. A DC-DC converter (30) is connected to the battery (20) side. A maximum output ratio of the fuel cell (40) and the battery (20) is set in a range in which the output of the fuel cell falls within 65 to 80% of the total output. Accordingly, electric power loss due to the DC-DC converter (30) is controlled, whereby a high energy efficiency can be achieved.
Claims13
A direct current power source comprising:
- a pair of terminals that output electric power;
- a fuel cell connected to the terminals;
- and
- an electric power storage device connected to the terminals in parallel with the fuel cell,
- wherein a ratio of a maximum output of the fuel cell to a maximum total output of the fuel cell and the electric power storage device is in a range of equal to or greater than 0.65 and equal to or less than 0.8.
A vehicle having a motor as a power source, comprising:
- a direct current power source that supplies electric power to the motor;
- and
- a drive circuit that drives the motor by the electric power,
- wherein the direct current power source includes:
- a pair of terminals that output electric power;
- a fuel cell connected to the terminals;
- and
- an electric power storage device connected to the terminals in parallel with the fuel cell,
- and wherein a ratio of a maximum output of the fuel cell to a maximum total output of the fuel cell and the electric power storage device is in a range equal to or greater than 0.65 and equal to or less than 0.8.
A method for designing a direct current power source in which a fuel cell and an electric power storage device are connected in parallel, comprising the steps of:
- setting a maximum total output of the fuel cell and the electric power storage device to be equal to or greater than a maximum required electric power required for the direct current power source;
- setting a ratio of a maximum output of the fuel cell to a maximum total output of the fuel cell and the electric power storage device to be equal to or greater than 0.65 and equal to or less than 0.8;
- setting the maximum output of the fuel cell to be equal to or greater than a target value of an electric power to be continuously output for a predetermined period;
- and
- setting a capacity of the electric power storage device to be equal to or greater than a maximum electric power input to the direct current power source from an external device.
Dependencies are inferred from the claim text.