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Title: Cascade redox flow battery systems

A reduction/oxidation ("redox") flow battery system includes a series of electrochemical cells arranged in a cascade, whereby liquid electrolyte reacts in a first electrochemical cell (or group of cells) before being directed into a second cell (or group of cells) where it reacts before being directed to subsequent cells. The cascade includes 2 to n stages, each stage having one or more electrochemical cells. During a charge reaction, electrolyte entering a first stage will have a lower state-of-charge than electrolyte entering the nth stage. In some embodiments, cell components and/or characteristics may be configured based on a state-of-charge of electrolytes expected at each cascade stage. Such engineered cascades provide redox flow battery systems with higher energy efficiency over a broader range of current density than prior art arrangements.
Inventors:
; ; ; ;
Issue Date:
OSTI Identifier:
1149689
Assignee:
Enervault Corporation (Sunnyvale, CA) NETL
Patent Number(s):
8,785,023
Application Number:
12/986,892
Contract Number:
OE0000225
Resource Relation:
Patent File Date: 2011 Jan 07
Research Org:
Enervault Corporation, Sunnyvale, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE

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