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Intermittent cooling of fuel cell

A fuel cell and fuel cell system technology, applied in the direction of fuel cells, fuel cell additives, solid electrolyte fuel cells, etc., can solve problems such as low efficiency

Inactive Publication Date: 2006-10-11
GENERAL MOTORS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, systems with high parasitic loads are less efficient than systems with low parasitic loads

Method used

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  • Intermittent cooling of fuel cell
  • Intermittent cooling of fuel cell

Examples

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Embodiment Construction

[0013] Description of the preferred embodiment

[0014] figure 1 A simplified form of a preferred fuel cell system of the invention comprising a fuel cell 2 having an anode side 4 and a cathode side 6 is shown in . Hydrogen 8 is supplied to the anode side 4 and discharged as anode off-gas 10 . Oxygen (air) 12 is supplied to the cathode side and exhausted as cathode off-gas 14 . Liquid coolant (eg glycol and water) in coolant circuit 16 is circulated via fuel cell 2 and heat exchanger (eg vehicle radiator) 18 by pump 20 powered by fuel cell 2 . The temperature of the coolant exiting the fuel cell 2 is measured at point 25 . The radiator 18 may have a fan and motor 24 for blowing ambient air through the radiator 18 . According to this embodiment, when the fuel cell system operates below 25% of its full power design value, the control circuit 22 measures the temperature of the cathode exhaust gas 14 and turns on or off the pump 20 according to the temperature. When operating...

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Abstract

The invention provides a method for increasing the efficiency of a fuel cell system (2) having a liquid coolant (16), a pump (20) for circulating the coolant through the fuel cell and A heat exchanger (18) for extracting heat. Increased efficiency is achieved by intermittently turning off the pump when the fuel cell is operating at less than 25% of its "full power" design value.

Description

technical field [0001] The present invention relates to liquid cooled fuel cell systems, and more particularly to improving cell efficiency by reducing the parasitic drain imposed on the cell by a coolant pump when the fuel cell is operating at low power. Background of the invention [0002] A fuel cell is an electrochemical device used to continuously convert fuel and oxidant into electrical energy. It consists of two electrodes (i.e., anode and cathode) separated by an ionically conductive electrolyte and provides a fuel (e.g., H 2 ), oxidizing agents (eg, O 2 ), reaction products (eg, H 2 O) and coolant flow in and out of the battery continuously. Fuel is continuously supplied to the anode (negative electrode) where oxidation occurs, providing electrons to the external circuit. An oxidizing agent is continuously supplied to the cathode (positive electrode) and reduction occurs at the cathode, where the oxidizing agent receives electrons from an external circuit. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04H01M8/10
CPCH01M8/04029H01M8/04268H01M8/04343H01M8/0435H01M8/04768Y02E60/50
Inventor M·M·霍赫
Owner GENERAL MOTORS CORP