Current leakage detection in high voltage battery pack
First Claim
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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.
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Abstract
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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Citations
14 Claims
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1. A method of detecting a current leakage path in a high voltage battery pack having a plurality of serially connected battery modules, comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of determining the leakage resistance RL of a connection between a first and second sets of series connected battery modules, Vmx−
- Vmn and Vm1−
Vmx respectively, forming a high voltage, rechargeable battery pack, comprising;
(A) switching said first set of modules Vmx−
Vmn into a first circuit containing a voltage measurement resistor;
(B) switching said second set of modules Vm1−
Vmx into a second circuit containing said measurement resistor;
(C) while said first set of modules Vmx−
Vmn is connected in said first circuit, determining the voltage V1 produced by said first set of modules Vmx−
Vmn, the current I1 flowing through said first circuit, and the voltage Va2d1, across said measurement resistor;
(D) while said second set of modules Vm1−
Vmx is connected in said second circuit, simultaneously determining the voltage V2 produced by said second set of modules Vm1−
Vmx, the current I2 flowing through said second circuit, and the voltage Va2d2 across said measurement resistor;
(E) compensating for any changes in the voltages of modules Vmx−
Vmn, Vm1−
Vmx occurring between steps (C) and (D); and
,(E) determining said leakage path resistance RL using the determined currents I1, I2, voltages V1, V2 and measured voltages Va2d1 and Va2d2. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
- Vmn and Vm1−
Specification