System and method for balancing state of charge among series-connected electrical energy storage units
First Claim
1. A system for balancing state of charge among plural series connected electrical energy storage units, comprising:
- a string of electrical energy storage units, each storage unit having a state of charge;
a circuit selectively monitoring the state of charge of each storage unit; and
when the state of charge of a selected unit is greater than a target state of charge, the circuit transferring energy from the selected unit to the string of storage units, such that the state of charge of the selected unit converges toward the target state of charge.
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Abstract
A system and method of balancing state of charge among plural series connected electrical energy storage unit is provided. Individual storage units are selectively coupled by semiconductor switches for monitoring and balancing state of charge. When the state of charge of a selected unit is greater than a target state of charge, energy is transferred from the selected unit to the string of storage units, such that the state of charge of the selected unit converges toward the target state of charge. Conversely, when the state of charge of a selected unit is less than a target state of charge, energy is transferred from the string of storage units to the selected unit, such that the state of charge of the selected unit converges toward the target state of charge.
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Citations
39 Claims
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1. A system for balancing state of charge among plural series connected electrical energy storage units, comprising:
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a string of electrical energy storage units, each storage unit having a state of charge;
a circuit selectively monitoring the state of charge of each storage unit; and
when the state of charge of a selected unit is greater than a target state of charge, the circuit transferring energy from the selected unit to the string of storage units, such that the state of charge of the selected unit converges toward the target state of charge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A system for balancing state of charge among plural series connected electrical energy storage units, comprising:
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a string of electrical energy storage units, each storage unit having a state of charge;
a circuit selectively monitoring the state of charge of each storage unit; and
when the state of charge of a selected unit is greater than a target state of charge, the circuit transferring energy from the selected unit to a non-dissipative load, such that the state of charge of the selected unit converges toward the target state of charge. - View Dependent Claims (23)
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24. A system for balancing state of charge among plural series connected electrical energy storage units, comprising:
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a string of electrical energy storage units, each storage unit having a state of charge;
a circuit selectively monitoring the state of charge of each storage unit under a load; and
when the state of charge of a selected unit is different than a target state of charge, the circuit transferring energy between the selected unit and the string of storage units, such that the state of charge of the selected unit converges toward the target state of charge.
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25. A method for balancing state of charge among plural series connected electrical energy storage units, comprising:
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selectively monitoring the state of charge of each storage unit in a string of electrical energy storage units;
when the state of charge of a selected unit is greater than a target state of charge, transferring energy from the selected unit to the string of storage units, such that the state of charge of the selected unit converges toward the target state of charge. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method for balancing state of charge among plural series connected electrical energy storage units, comprising:
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selectively monitoring the state of charge of each storage unit in a string of electrical energy storage units; and
when the state of charge of a selected unit is greater than a target state of charge, transferring energy from the selected unit to a non-dissipative load, such that the state of charge of the selected unit converges toward the target state of charge. - View Dependent Claims (38)
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39. A method for balancing state of charge among plural series connected electrical energy storage units, comprising:
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selectively monitoring the state of charge of each storage unit in a string of electrical energy storage units, the selected storage unit being monitored under a load;
when the state of charge of a selected unit is different than a target state of charge, transferring energy between the selected unit and the string of storage units, such that the state of charge of the selected unit converges toward the target state of charge.
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Specification