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Fuel cell system

A fuel cell system and fuel cell technology, used in fuel cells, fuel cell additives, transportation fuel cell technology, etc., can solve problems such as low voltage of single cells and inability to keep up with current limitations

Active Publication Date: 2013-12-04
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is the following problem: when the current limit is performed after the cell voltage is lower than the allowable value, the cell voltage drops rapidly during rapid warm-up, so the current limit cannot keep up, and the cell voltage drops significantly. below allowable value

Method used

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Examples

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Deformed example 1

[0102] In the above embodiment, when any one of the conditional expressions (1) and (3) is established, the minimum cell voltage target value is updated. In addition (or instead), the following conditional expression (5) can also be used: When established, update the minimum cell voltage target value.

[0103] In the implementation of current limit, Ic=I1 lasts for more than reset time Ts...(5)

[0104] Ic is a current command value, and I1 is a current lower limit value.

[0105] When the cell voltage target value setting unit 80d determines that the conditional expression (5) is satisfied, as shown in the following expression (6), the minimum cell voltage target value Vth is updated to the minimum cell voltage Vr at the present time. .

[0106] Vth=Vr...(6)

[0107] Vr represents the lowest cell voltage Vr at the current moment.

[0108] Therefore, the cell voltage target value setting unit (setting unit) 80d sets the current command value of the fuel cell 20 to the rese...

Deformed example 2

[0110] In addition, instead of the above-mentioned conditional expressions (1) and (3) (or simultaneously), the minimum cell voltage target value may be updated when the following conditional expressions (1)' and (3)' are satisfied. In addition, the predetermined times Nr (≥1), Nr' (≥1) can be set and changed arbitrarily.

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Abstract

A fuel cell system capable of carrying out a proper current limiting even when decreasing a cell voltage through, e.g., a rapid warm-up is provided. When a rapid warm-up is started, an acceptable cell-voltage value setting part sets a acceptable lowest-cell-voltage value in accordance with the operation state of a fuel cell. Meanwhile, a target cell-voltage value setting part sets an initial value for a target lowest-cell-voltage value. The target cell-voltage value setting part then compares a lowest cell voltage detected by a cell monitor with the set target lowest-cell-voltage value, and judges whether or not the lowest cell voltage is near the target lowest-cell-voltage value continuously for a given time period. If the result of the judgment is positive, the target cell-voltage value setting part updates the target lowest-cell-voltage value with a value obtained by decreasing the target lowest-cell-voltage value only by an update width.

Description

technical field [0001] The invention relates to a fuel cell system with a fuel cell having a plurality of individual cells. Background technique [0002] As a fuel cell that generates electricity by utilizing an electrochemical reaction of hydrogen and oxygen, there is, for example, a solid polymer fuel cell. This solid polymer fuel cell has a battery pack constituted by stacking a plurality of single cells. A unit cell constituting a battery pack has an anode (fuel electrode) and a cathode (air electrode), and a solid polymer electrolyte membrane having a sulfonic acid group exists as an ion exchange group between the anode and the cathode. [0003] Fuel gas containing fuel gas (reformed hydrogen obtained by reforming hydrogen or hydrocarbons to become rich in hydrogen) is supplied to the anode, and a gas containing oxygen (oxidant gas), such as air, is supplied to the cathode as an oxidizing agent. When the fuel gas is supplied to the anode, hydrogen contained in the fue...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04H01M8/10
CPCY02T90/32H01M2250/20H01M8/0488H01M8/04335Y02E60/50H01M8/04388H01M8/04589H01M8/04559H01M8/04268H01M8/04395H01M2008/1095H01M8/0491H01M8/04358H01M8/0432Y02T90/40
Inventor 今西启之真锅晃太小川朋也
Owner TOYOTA JIDOSHA KK