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Fuel cell device

A fuel cell and power supply device technology, applied in the direction of fuel cells, fuel cell integration, fuel cell additives, etc., can solve the problem of output characteristic decline and achieve the effect of output characteristic recovery

Inactive Publication Date: 2007-10-10
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] If the fuel cell is continuously operated under constant current control or constant power control, the voltage gradually drops, resulting in a problem that the output characteristics are degraded.

Method used

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Experimental program
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Effect test

Embodiment 1

[0036] The control method of this embodiment will be described below.

[0037] Among the main causes of voltage drop during power generation are electrode catalyst poisoning (CO, hydrogen peroxide, etc.), supply obstruction due to reaction products (carbon dioxide in the fuel electrode, water in the air electrode), and clogging of the air electrode , Fuel interruption and other reasons.

[0038] First, it is considered that the decrease in the output characteristics of the DMFC due to electrode poisoning is mainly caused by a decrease in the potential of the cathode (air electrode) of the DMFC. Under the condition of constant power load, the poisoning of the region electrode was tested by reducing the current value drawn from the DMFC whose voltage dropped to reduce the load power, and by raising (recovering) the voltage of the DMFC once. After this operation, the load power was again made the same as when the voltage was lowered. As a result, as shown in FIG. 2 , the output ...

Embodiment 2

[0058] In FIG. 12 , the charger type uses control to increase the voltage of the fuel cell 1 to restore the output characteristics. The present embodiment is characterized in that charging from the fuel cell 1 to the electric double layer capacitor 2 is performed when the above-mentioned voltage rises. The details are described below.

[0059] The configuration of this embodiment includes two power sources of a fuel cell 1 and an electric double layer capacitor (EDLC) 2 . In this embodiment, the fuel cell 1 is used as a power source with high energy density, and the electric double layer capacitor 2 is used as a power source with high power density. In order to simplify the structure, it is desirable that the fuel cell 1 is a direct methanol fuel cell (DMFC). In addition, in FIG. 12 , one electric double layer capacitor 2 is used in series, but it is preferable that the maximum voltage calculated from the number of series cells of the fuel cell required for output does not e...

Embodiment 3

[0062] An example of this power supply unit will be described with reference to FIGS. 17 and 18 .

[0063] FIG. 17 is an example of a case where the target device is a notebook PC. The power supply unit is compatible with the AC adapter for the notebook PC as the target device. V in Figure 13 as the connection terminal for the load + and V - become a structure that can be connected to the AC adapter of the notebook PC, at V + and V - The DC / DC converter 5 is used to output the voltage (16V, 19V, 20V, etc.) compatible with the AC adapter.

[0064] FIG. 18 shows an example in which the battery mounted on the target device is a one-unit Li series secondary battery represented by a cellular phone, a PDA, a MOS player, a portable multimedia player, and the like. Furthermore, as shown in FIG. 18, by setting the terminal on the power supply unit side as a common terminal such as a USB terminal, it is possible to change the connection cord according to the target device. In Figu...

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Abstract

A control method of a power source system having at least two kind of power supply, such as a fuel cell and an auxiliary power supply and supplying power to electronic devices, the fuel cell characteristics being recovered by increasing the fuel cell output voltage.

Description

technical field [0001] The present invention relates to a power supply device using a fuel cell and a control method thereof. Background technique [0002] With the advancement of electronic technology in recent years, the spread of portable electronic devices such as mobile phones, notebook PCs, audio-visual devices, and portable terminal devices has rapidly progressed. Such portable electronic devices are driven by secondary batteries. With the emergence of new secondary batteries, miniaturization, light weight, and high energy density, they have developed from sealed lead batteries to Ni / Cd batteries, Ni hydrogen batteries, and then Li batteries. ion battery. In any secondary battery, in order to increase the energy density, the development of battery active materials and the development of a high-capacity battery structure have been carried out, and efforts have been made to realize a power source with a longer service life. [0003] However, although efforts have been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04H01M8/00
CPCH01M8/04992H01M8/04223H01M16/006Y02E60/523H01M10/052H01M8/04559Y02B90/18H01M2250/30H01M8/1011H01M8/0494H01M8/0491H01M8/04228H01M8/04303Y02B90/10Y02E60/10Y02E60/50
Inventor 乗松泰明叶田玲彦菊地睦
Owner HITACHI LTD