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Power supply system and voltage control method for fuel cell

A voltage control method and fuel cell technology, applied in fuel cells, battery/battery traction, battery circuit devices, etc., can solve problems such as poor energy efficiency and energy efficiency decline, and achieve the effect of simplifying the system structure

Active Publication Date: 2016-05-25
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of temporarily storing the electric power generated by the fuel cell in the secondary battery is inferior in energy efficiency compared to the case of directly using the electric power generated by the fuel cell, and thus leads to a decrease in the energy efficiency of the entire system including the fuel cell.

Method used

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  • Power supply system and voltage control method for fuel cell
  • Power supply system and voltage control method for fuel cell
  • Power supply system and voltage control method for fuel cell

Examples

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Embodiment Construction

[0041] figure 1 It is a block diagram showing a schematic configuration of a fuel cell vehicle 20 according to the first embodiment of the present invention. The fuel cell vehicle 20 is equipped with a power supply system 30 on a vehicle body 22 . The power supply system 30 and the electric motor 170 for driving the fuel cell vehicle 20 are connected by wiring 178 , and electric power is exchanged between the power supply system 30 and the electric motor 170 via the wiring 178 .

[0042] The power supply system 30 includes a fuel cell 100 , a hydrogen supply unit 120 including a hydrogen tank 110 , an air supply unit 140 including a compressor 130 , a secondary battery 172 , a DC / DC converter 104 , a DC / DC converter 174 , and a control unit 200 . It should be noted that the power supply system 30 further includes a refrigerant circulation unit (not shown) in which a refrigerant for cooling the fuel cell flows through the fuel cell in order to keep the temperature of the fuel...

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PUM

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Abstract

A voltage control method for a fuel cell (100) includes: interrupting electrical connection between the fuel cell and a load (170, 172) in a low load state; supplying oxygen to the fuel cell in accordance with a preset condition during the electrical connection is interrupted; detecting an OCV (open circuit voltage) of the fuel cell after oxygen is supplied to the fuel cell in accordance with the preset condition; reducing an amount of oxygen supplied to the fuel cell when the OCV is higher than a target voltage by a first value or larger; increasing the amount of oxygen when the OCV is lower than the target voltage by a second value or larger; and keeping the amount of oxygen when the OCV is lower than a sum of the target voltage and the first value and higher than a value obtained by subtracting the second value from the target voltage.

Description

technical field [0001] The invention relates to a voltage control method of a power supply system and a fuel cell. Background technique [0002] In a power supply system equipped with a fuel cell, when electric power is extracted from the power supply system in accordance with a demanded power from a load (hereinafter, also referred to as a load demand), there is a possibility that the load demand is temporarily extremely small even during operation of the power supply system. Condition. In a system including a fuel cell, generally, when the power generated by the fuel cell is very small, the energy efficiency of the entire system decreases. Therefore, as one of the controls performed when the load demand on the power supply system is extremely small, the control to stop the power generation of the fuel cell is performed. And, for the load, the required electric power is output by the secondary battery mounted in the power supply system together with the fuel cell. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04537H01M8/04746H01M8/04089
CPCH01M8/04089H01M8/04544H01M8/04753H01M8/0488H01M8/04955H01M8/04097H01M8/04179H01M8/04223H01M8/04388H01M8/04395H01M8/04559H01M2008/1095B60L50/52Y02T10/70Y02E60/50H02J2207/20
Inventor 山中富夫滩光博铃木博之
Owner TOYOTA JIDOSHA KK