Compensation for parasitic resistance in battery monitoring
First Claim
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1. A device for correcting a monitored battery cell voltage read from a battery balancing circuit to an actual battery cell voltage, comprising:
- a plurality of balancing circuits, coupled to each of a plurality of coupled battery cells, the plurality of balancing circuits enabled to conduct current to and from the battery cells;
a share bus, coupled to at least each of the plurality of balancing circuits; and
a monitoring circuit, coupled to the battery balancing circuit, the monitoring circuit configured to;
monitor a battery cell voltage;
monitor a share bus voltage; and
adjust the monitored battery cell voltage to reflect an actual battery cell voltage based on the share bus voltage, a share bus resistance and a balancing circuit parasitic resistance.
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Abstract
A system for balancing charge between a plurality of storage battery cells within a storage battery. The battery balancing system may sense changes, possibly caused by environmental influences, in the overall resonant frequency of charge balancing circuits contained within the battery balancing system and compensate for the change in resonant frequency. Further, the system may correct battery cell voltages monitored by a controller that may include errors due to intrinsic circuit problems, such as parasitic voltage, to reflect an actual voltage of a battery cell.
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Citations
24 Claims
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1. A device for correcting a monitored battery cell voltage read from a battery balancing circuit to an actual battery cell voltage, comprising:
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a plurality of balancing circuits, coupled to each of a plurality of coupled battery cells, the plurality of balancing circuits enabled to conduct current to and from the battery cells; a share bus, coupled to at least each of the plurality of balancing circuits; and a monitoring circuit, coupled to the battery balancing circuit, the monitoring circuit configured to; monitor a battery cell voltage; monitor a share bus voltage; and adjust the monitored battery cell voltage to reflect an actual battery cell voltage based on the share bus voltage, a share bus resistance and a balancing circuit parasitic resistance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for correcting a monitored battery cell voltage read from a battery balancing circuit to an actual battery cell voltage, comprising:
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monitoring a battery cell voltage from a plurality of balancing circuits each coupled to at least a monitoring circuit, a share bus and a battery cell; monitoring the share bus voltage; and adjusting the monitored battery cell voltage to reflect an actual battery cell voltage based on the share bus voltage, a share bus resistance and a balancing circuit parasitic resistance. - View Dependent Claims (10, 11, 12, 13)
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14. A system for balancing the energy level of a plurality of coupled battery cells, comprising:
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a battery balancing system including a plurality of balancing circuits; the plurality of balancing circuits, coupled to each of a plurality of coupled battery cells, the plurality of balancing circuits enabled to conduct current to and from the battery cells; a share bus, coupled to at least each of the plurality of balancing circuits; and a monitoring circuit, coupled to the battery balancing circuit, the monitoring circuit configured to; monitor a battery cell voltage; monitor a share bus voltage; and adjust the monitored battery cell voltage to reflect an actual battery cell voltage based on the share bus voltage, a share bus resistance and a balancing circuit parasitic resistance. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A computer program product embodied on a computer-readable medium and configured to cause a processing device to execute method steps, comprising:
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monitoring a battery cell voltage from a plurality of balancing circuits each coupled to at least a monitoring circuit, a share bus and a battery cell; monitoring the share bus voltage; and adjusting the monitored battery cell voltage to reflect an actual battery cell voltage based on the share bus voltage, a share bus resistance and a balancing circuit parasitic resistance. - View Dependent Claims (23, 24)
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Specification