Lithium-ion battery safety monitoring
First Claim
1. A method for monitoring the safety of a rechargeable Li-ion battery (LIB), the method comprising the procedures of:
- measuring, using a response measurement device, a cell operating parameter of said LIB;
determining an initial electrical state of said LIB based on the cell operating parameter;
altering the electrical state of said LIB by the application or removal of a direct current (DC) electrical stimulus to said LIB, using a stimulus application device, so as to trigger a time-varying response;
measuring, using the response measurement device, the time-varying response of said LIB to the altered electrical state;
extracting at least one primary response parameter associated with at least the functional form of the measured response;
deriving at least one secondary response parameter from said primary response parameter;
determining a likelihood of a short circuit precursor condition, in accordance with at least one of;
said primary response parameter; and
said secondary response parameter, wherein said primary response parameter includes at least one ofvoltage response values at different times,current response values at different times, andparameters relating to the electrical state altering; and
providing an alert of a potential short circuit derived hazard, in accordance with the determined likelihood of a short circuit precursor condition.
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Accused Products
Abstract
Method and system for monitoring the safety of a rechargeable Li-ion battery (LIB). An initial electrical state of the LIB is determined and altered by application or removal of DC electrical stimulus to trigger a time-varying response. The time-varying response of the LIB is measured, and at least one primary response parameter associated with the functional form of the measured response is extracted. At least one secondary response parameter is derived from the primary response parameter. A composite response parameter may be further derived from the primary response parameter and secondary response parameter. A likelihood of a short circuit precursor condition is determined in accordance with the primary response parameter, secondary response parameter and/or composite response parameter. Based on the determined likelihood, an alert of a potential short circuit derived hazard may be provided and/or a corrective measure to mitigate or prevent a short circuit derived hazard may be implemented.
22 Citations
18 Claims
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1. A method for monitoring the safety of a rechargeable Li-ion battery (LIB), the method comprising the procedures of:
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measuring, using a response measurement device, a cell operating parameter of said LIB; determining an initial electrical state of said LIB based on the cell operating parameter; altering the electrical state of said LIB by the application or removal of a direct current (DC) electrical stimulus to said LIB, using a stimulus application device, so as to trigger a time-varying response; measuring, using the response measurement device, the time-varying response of said LIB to the altered electrical state; extracting at least one primary response parameter associated with at least the functional form of the measured response; deriving at least one secondary response parameter from said primary response parameter; determining a likelihood of a short circuit precursor condition, in accordance with at least one of;
said primary response parameter; and
said secondary response parameter, wherein said primary response parameter includes at least one ofvoltage response values at different times, current response values at different times, and parameters relating to the electrical state altering; and providing an alert of a potential short circuit derived hazard, in accordance with the determined likelihood of a short circuit precursor condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for monitoring the safety of a rechargeable Li-ion battery (LIB), the system comprising:
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a stimulus application device, configured to alter the electrical state of said LIB by the application or removal of a direct current (DC) electrical stimulus to said LIB so as to trigger a time-varying response; a response measurement device, configured to measure a cell operating parameter of the LIB for determining an initial electrical state of the LIB, and further configured to measure the time-varying response of said LIB to the altered electrical state; a processor, coupled with said response measurement device, said processor configured to extract at least one primary response parameter associated with at least the functional form of the measured response, further configured to derive at least one secondary response parameter from said primary response parameter, and to determine a likelihood of a short circuit precursor condition, in accordance with at least one of said primary response parameter; and
said secondary response parameter, wherein said primary response parameter includes at least one ofvoltage response values at different times, current response values at different times, and parameters relating to the electrical state altering; and a notification unit, configured to provide an alert of a potential short circuit derived hazard, in accordance with the determined likelihood of a short circuit precursor condition. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification