Patents
US patent 6,778,913
Multiple model systems and methods for testing electrochemical systems
A method for testing an electrochemical system includes obtaining complex impedance data for the electrochemical system at multiple frequencies; fitting the complex impedance data to two or more models of the system to obtain a set of fitted parameters; and deriving a value for a characteristic of the electrochemical system based upon parameters of the set of fitted parameters. The electrochemical system may be an electrochemical battery. The characteristic may be a state of health, state of charge, or other characteristic of a battery.
View Patent Details At U.S. Patent & Trademark Office
Cadex Electronics Inc. applied for global rights on US patent 6,778,913.
US patent 7,019,542
Method and apparatus for battery testing
A method for testing electrochemical cells applies to a portion of a cycle of a low-frequency excitation waveform to a cell under test while maintaining an amplitude of the excitation waveform below a threshold value. In some cases a quarter cycle of the excitation waveform is used. Phase and amplitude of a response to the excitation waveform may be determined by applying formulae based on geometry.
View Patent Details At U.S. Patent & Trademark OfficeUS patent 7,072,871
Fuzzy logic method and apparatus for battery state of health determination
A system for determining the state-of-health of batteries has an adaptive component. The system tests a battery by measuring a number of electrochemical parameters and using fuzzy logic to compute a state-of-health for the battery. The fuzzy logic computations are based upon membership functions, which are preferably triangular. The membership functions may be stored in a matrix. The adaptive component adapts the system for use with new models of battery by obtaining a reliable measurement of SoH for a number of calibration batteries. Electrochemical parameters of the calibration batteries are measured. The adaptive component modifies a prototype matrix selected to match the chemistry type of the calibration batteries by scaling, translating and flexing its membership functions to achieve a matrix, which specifies membership functions suitable for assessing state-of-health of the new model of battery.
View Patent Details At U.S. Patent & Trademark Office
