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US 2014/0369376 A1Published application
Battery pack thermistor test method
AssigneeFord Global Technologies, LLC
InventorRobert C. Keeton
Life of this patent
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Abstract
A battery pack thermistor test method includes charging a battery pack, monitoring a rise in average temperature reported by at least one thermistor on the battery pack over a predetermined time period, preparing at least one thermistor slope by calculating a least square fit of time vs. temperature for the at least one thermistor and comparing the at least one thermistor slope to process-defined thermistor slope limits.
Claims20
A battery pack thermistor test method, comprising:
- charging a battery pack;
- monitoring a rise in average temperature reported by at least one thermistor on the battery pack over a predetermined time period;
- preparing at least one thermistor slope by calculating a least square fit of time vs. temperature for the at least one thermistor;
- and
- comparing the at least one thermistor slope to process-defined thermistor slope limits.
2 more elements
A battery pack thermistor test method, comprising:
- stabilizing a battery pack to room temperature with state of charge not exceeding about 10%;
- monitoring a rise in average temperature as reported by at least one thermistor in the battery pack;
- charging the battery pack;
- monitoring a rise in average temperature reported by at least one thermistor on the battery pack over a predetermined time period;
- preparing at least one thermistor slope by calculating a least square fit of time vs. temperature for the at least one thermistor;
- and
- comparing the at least one thermistor slope to process-defined thermistor slope limits.
4 more elements
A battery pack thermistor test method, comprising:
- stabilizing a battery pack to room temperature with state of charge not exceeding about 10%;
- monitoring a rise in average temperature as reported by at least one thermistor in the battery pack;
- cycling through a charge profile of stepped current applied to the battery pack;
- waiting for a rise in temperature as reported by the at least one thermistor;
- waiting for a duration of a final step in the charge profile;
- determining whether a temperature rise is reported by the at least one thermistor within a predetermined time period;
- waiting for a time period corresponding to the duration of the final step in the charge profile;
- preparing at least one thermistor slope by calculating a least square fit of time vs. temperature for the at least one thermistor;
- and
- comparing the at least one thermistor slope to process-defined thermistor slope limits.
7 more elements
Dependencies are inferred from the claim text.