The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 06, 2011
Filed:
Apr. 19, 2006
Kazuhito Hatoh, Osaka, JP;
Hiroki Kusakabe, Osaka, JP;
Hideo Ohara, Osaka, JP;
Susumu Kobayashi, Nara, JP;
Nobuhiro Hase, Osaka, JP;
Shinsuke Takeguchi, Osaka, JP;
Teruhisa Kanbara, Osaka, JP;
Kazuhito Hatoh, Osaka, JP;
Hiroki Kusakabe, Osaka, JP;
Hideo Ohara, Osaka, JP;
Susumu Kobayashi, Nara, JP;
Nobuhiro Hase, Osaka, JP;
Shinsuke Takeguchi, Osaka, JP;
Teruhisa Kanbara, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The durability of a polymer electrolyte fuel cell is very significantly improved by using a tightening pressure of about 2 to 4 kgf/cmof area of electrode; or a tightening pressure of about 4 to 8 kgf/cmof contact area between electrode and separator plate; or by selecting a value not exceeding about 1.5 mS/cmfor the short-circuit conductivity attributed to the DC resistance component in each unit cell; or by selecting a value not exceeding about 3 mA/cmfor the hydrogen leak current per area of electrode of each MEA. Further, in a method of manufacturing or an inspection method for a polymer electrolyte fuel cell stack, fuel cells having high durability can be efficiently manufactured by removing such MEAs or unit cells using such MEAs or such cell stacks having short-circuit conductivity values and/or hydrogen leak current values exceeding predetermined values, respectively.