Method and apparatus for battery testing
First Claim
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1. A method for testing an electrochemical battery, the method comprising:
- generating a response by applying an excitation waveform to an electrochemical battery being tested while maintaining a magnitude of the excitation waveform small enough that a relationship between the response and the excitation waveform is substantially linear;
monitoring the response;
based upon values of the response during a period which does not exceed one cycle of the excitation waveform, determining a relationship between phase and amplitude of the excitation waveform and phase and amplitude of the response.
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Abstract
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 an amplitude of a response to the excitation waveform may be determined by applying formulae based on geometry.
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21 Claims
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1. A method for testing an electrochemical battery, the method comprising:
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generating a response by applying an excitation waveform to an electrochemical battery being tested while maintaining a magnitude of the excitation waveform small enough that a relationship between the response and the excitation waveform is substantially linear;
monitoring the response;
based upon values of the response during a period which does not exceed one cycle of the excitation waveform, determining a relationship between phase and amplitude of the excitation waveform and phase and amplitude of the response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification