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Fuel cell system and its stop method

A fuel cell system and fuel cell technology, used in fuel cells, fuel cell additives, fuel cell heat exchange, etc., can solve problems such as fuel cell system damage, restart, freezing of water or cooling water, and other problems

Inactive Publication Date: 2004-05-05
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In a fuel cell system including a fuel cell using water, if the system is below the freezing point when the system has stopped, water or cooling water in the cell freezes, causing damage to the fuel cell system or affecting its restart

Method used

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  • Fuel cell system and its stop method
  • Fuel cell system and its stop method
  • Fuel cell system and its stop method

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Embodiment Construction

[0013] see figure 1 A vehicle having a fuel cell system 1 according to the present invention includes a controller 3 for controlling the fuel cell system 1 , a battery 2 charged by electric energy generated by the fuel cell system 1 , and switches 5 , 6 . The fuel cell system 1 is connected to a load 4 .

[0014] The fuel cell system 1 is a polymer electrolyte fuel cell (PEFC) (or phosphoric acid fuel cell (PAFC)), which is a fuel cell that requires humidification during operation. The controller 3 includes one, two or more microprocessors, memory and input / output terminals. When the fuel cell system 1 is stopped, the controller 3 performs a temperature raising operation of the fuel cell system 1 described below.

[0015] The load 4 is a motor that receives power from the fuel cell system 1 and generates driving force. The driving force of the motor drives the wheels of the vehicle through the push rod of the vehicle.

[0016] The fuel cell system 1 is connectable to a loa...

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Abstract

When a fuel cell system is to be stopped, a controller 3 decreases the coolant flowrate to a fuel cell 1, decreases the cooling performance of the fuel cell 1 and continues operation of the fuel cell 1, and performs a temperature rise operation wherein the temperature of the fuel cell 1 is increased using the heat generated by the electrochemical reaction in the fuel cell 1. After the temperature of the fuel cell 1 has reached a predetermined high temperature, the operation of the fuel cell 1 is stopped.

Description

technical field [0001] The present invention relates to a fuel cell system, a method of terminating the system and prevention of fuel cell freezing. Background technique [0002] In certain fuel cells, such as polymer electrolyte fuel cells, that generate electricity using energy generated by the chemical reaction between hydrogen and oxygen, the fuel cell must be kept wet to allow the fuel cell to operate. The fuel cell itself generates heat when it generates electricity, and thus requires a cooling system that cools the fuel cell with cooling water or the like. [0003] In a fuel cell system including a fuel cell using water, if the system is below the freezing point when the system has stopped, water or cooling water in the cell freezes, causing damage to the fuel cell system or affecting its restart. JP7-169475A published in 1995 and JP11-214025A published by the Japanese Patent Office propose a method for preventing freezing of fuel cells. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/10H01M8/04H01M16/00
CPCH01M8/04007H01M8/04701H01M8/04253Y02E60/50H01M16/006H01M8/04223Y02E60/10H01M8/241H01M8/04303H01M8/04228H01M8/2457H01M8/04H01M8/0267
Inventor 宫泽笃史竹川寿弘
Owner NISSAN MOTOR CO LTD