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Current leakage detection in high voltage battery pack
| Details |
Inventors: Jin, Jizeng;
Assignee: Ford Global Technologies, LLC (Dearborn, MI)
Primary Examiner: Chace; Christian P.
Assistant Examiner:
Attorney, Agent or Firm: Tung & Associates, Hanze; Carlos
A method of detecting leakage currents in a high voltage battery pack system reduces detection error caused by fluctuations in battery pack voltage during the detection process. The voltages of the individual modules forming the battery pack are separately and simultaneously measured during each measurement of leakage current on the high and low sides of the leakage point. Measurements of individual module voltages are combined with the simultaneous current leakage measurements to calculate leak resistance. |
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DETAILED DESCRIPTION The invention claimed is: 1.
A method of detecting a current leakage path in a high voltage battery pack having a plurality of serially connected battery modules, comprising: (A) connecting a first set of said modules into a first circuit containing a voltage measurement resistor; (B) connecting a second set of said modules into a second circuit containing said measurement resistor; (C) while said first set of modules is connected in said first circuit, simultaneously determining the voltage of each of the modules, and a first current flowing through said first circuit, and measuring a first voltage across said measurement resistor; (D) while said second set of modules is connected in said second circuit, simultaneously determining the voltage of each of the modules, and a second current flowing through said second circuit, and measuring a second voltage across said measurement resistor; and, (E) determining a leakage path resistance associated with said leakage path using the first and second currents, the determined voltages of the second set of modules, and the first and second measured voltages, wherein step (E) includes preparing a pair of lookup tables providing comparative data including the leakage resistance at each of a plurality of connection points to said modules representing potential current leakage paths.
2.
The method of claim 1, wherein steps (C) and (D) are respectively performed at first and second points in time.
3.
The method of claim 1, wherein step (E) includes determining the connection point at which the leakage resistance is the same value in each of the tables.
4.
The method of claim 1, wherein: one of said lookup tables includes, for each of said connection points, a calculated leakage resistance RL and an associated voltage representing the sum of the voltages of the first set of modules, the other of said lookup tables includes, for each of said connection points, a calculated leakage resistance RL and an associated voltage representing the sum of the voltages of the second set of modules
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Electrical and Wave 
