Methods and algorithms of cyclic coulometry

Patent · 29 March 2022

OSTI ID:1892761

Weiss, Steven E.; Lemay, Charles R.; Ferencz, Andrew

Systems, devices, and methods of diagnosing an electrochemical cell using cyclic coulometry are discussed. An exemplary battery diagnostic system comprises a current generator to generate symmetric charge current and discharge current to excite an electrochemical cell, and a cyclic coulometer to evaluate performance of the electrochemical cell. The cyclic coulometer can adjust at least one of a charge time for applying the charge current, or a discharge time for applying the discharge current, to keep a monitored cell voltage toward a specific setpoint. The adjustment of charge or discharge time can be achieved by changing a current switch timing for reversing current from a first to a second current direction. The cyclic coulometer measures one or more electrical parameters during the charge or discharge cycle, and generates a performance metric using the measured electrical parameters.

• Research Organization: Xilectric, Inc., Fall River, MA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: SC0018908
• Assignee: Xilectric, Inc., (Fall River, MA)
• Patent Number(s): 11,287,481
• Application Number: 16/432,331
• OSTI ID: 1892761
• Country of Publication: United States
• Language: English

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