High voltage battery contactor arrangement for DC fast charging
AssigneeFord Global Technologies, LLC
InventorsPhilip Michael Gonzales, Vineeth Seshadri Kallur, Masahiro Kimoto, Wesley Edward Burkman, Benjamin A. Tabatowski-Bush
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Abstract
A charging system for a high voltage battery includes a pair of contactors each electrically connected to one of positive and negative terminals of the battery and configured to enable charging of the battery when closed; and a controller programmed to generate a notification indicating that one of the contactors is welded closed based on port voltage values achieved while issuing a predetermined sequence of open and close commands to the contactors after charge completion.
Claims13
A system, comprising:
- two contactors each connected to a different one of opposing battery terminals, wherein closing both of the contactors enables charging of the battery;
- and
- a controller programmed to generate a notification that both contactors are welded closed responsive to, upon charge completion, both a difference between a port voltage across contactor nodes and a battery voltage, prior to open command, being less than a first threshold and the port voltage, after the command, being greater than a second threshold.
A method for charging a traction battery comprising:
- commanding to close first and second contactors, the first contactor being electrically connected to a positive terminal of the battery, the second contactor being electrically connected to a negative terminal of the battery, and the first and second contactors being arranged to enable charging of the battery;
- monitoring a port voltage across a positive node of the first contactor and a negative node of the second contactor;
- and
- generating a notification indicating that one of the contactors is welded closed responsive to, upon charge completion, both a difference between the port voltage and the battery voltage prior to a command to open both of the contactors, being less than a first threshold and the port voltage, after the command, being less than a second threshold, wherein the second threshold is greater than the first threshold.
A charging system for a traction battery comprising:
- first and second contactors, the first contactor being electrically connected to a positive terminal of the battery and the second contactor being electrically connected to a negative terminal of the battery;
- and
- a controller programmed to generate a notification indicating that both contactors are welded closed responsive to, upon charge completion, both a difference between a port voltage across nodes of the contactors and a battery voltage, prior to a command to open of the both contactors, being less than a first threshold and the port voltage, detected after the command to open both of the contactors, being greater than a second threshold.
Dependencies are inferred from the claim text.