Robert Reed Rixford

US Patent:

62421255, Jun 5, 2001

Filed:

May 4, 1999

Appl. No.:

9/305218

Inventors:

Phillip A. Eidler - Muskego WI
Peter J. Lex - Wauwatosa WI
Robert R. Rixford - Sheboygan Falls WI
Bjorn Jonshagen - South Fremantle, AU

Assignee:

ZBB Technologies, Inc. - Wauwatosa WI

International Classification:

H01M 238
H01M 804

US Classification:

429 51

Abstract:

A circulation system for a flowing-electrolyte battery having at least one electrochemical cell, an anolyte reservoir, and a catholyte reservoir. The circulation system includes an anolyte pump coupled in fluid flowing relationship to the anolyte reservoir which pumps anolyte from the anolyte reservoir to the at least one electrochemical cell. A catholyte pump is coupled in fluid flowing relationship to the catholyte reservoir and also pumps catholyte to the at least one electrochemical cell. A second phase pump is coupled in fluid flowing relationship to the catholyte reservoir and is used to introduce second phase electrolyte into the aqueous catholyte pumped by the catholyte pump. The second phase pump is controlled by a controller so that the second phase is introduced into the catholyte stream in a metered fashion. A controllable four-way valve is coupled in fluid flowing relationship to the catholyte pump and operable to direct the flow of catholyte through the electrochemical cell in a first direction, and periodically reverse the flow of the catholyte in a second direction.