Battery energy storage system and control system and applications thereof
First Claim
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1. An electrical energy storage unit, comprising:
- a battery pack controller configured to monitor a plurality of battery cells;
a battery pack discharger, coupled to the battery pack controller, configured to individually discharge energy from each of the plurality of battery cells; and
a battery pack charger, coupled to the battery pack controller, configured to charge the plurality of battery cells,wherein the battery pack controller receives a target balancing value and controls operation of the battery pack discharger and the battery pack charger to adjust a state-of-charge of each of the plurality of battery cells toward the target balancing value by at least;
instructing the battery pack charger to charge the plurality of battery cells in response to the state-of-charge of at least one of the plurality of battery cells being below a first threshold related to the target balancing value, andinstructing the battery pack discharger to individually discharge one or more of the plurality of battery cells in response to the state-of-charge of the one or more battery cells being above a second threshold related to the target balancing value.
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Abstract
An electrical energy storage unit and control system, and applications thereof. In an embodiment, the electrical energy storage unit (which may also be referred to as a battery energy storage system (“BESS”)) includes a battery system controller and battery packs. Each battery pack has battery cells, a battery pack controller that monitors the cells, a battery pack cell balancer that adjusts the amount of energy stored in the cells, and a battery pack charger. The battery pack controller operates the battery pack cell balancer and the battery pack charger to control the state-of-charge of the cells. In an embodiment, the cells are lithium ion battery cells.
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Citations
20 Claims
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1. An electrical energy storage unit, comprising:
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a battery pack controller configured to monitor a plurality of battery cells; a battery pack discharger, coupled to the battery pack controller, configured to individually discharge energy from each of the plurality of battery cells; and a battery pack charger, coupled to the battery pack controller, configured to charge the plurality of battery cells, wherein the battery pack controller receives a target balancing value and controls operation of the battery pack discharger and the battery pack charger to adjust a state-of-charge of each of the plurality of battery cells toward the target balancing value by at least; instructing the battery pack charger to charge the plurality of battery cells in response to the state-of-charge of at least one of the plurality of battery cells being below a first threshold related to the target balancing value, and instructing the battery pack discharger to individually discharge one or more of the plurality of battery cells in response to the state-of-charge of the one or more battery cells being above a second threshold related to the target balancing value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electrical energy storage unit, comprising:
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a battery system controller that calculates a target balancing value; and a plurality of battery packs, coupled to the battery system controller, wherein each battery pack comprises; a plurality of battery cells; a battery pack controller configured to monitor the plurality of battery cells; a battery pack discharger, coupled to the battery pack controller, configured to individually discharge energy from each of the plurality of battery cells; and a battery pack charger, coupled to the battery pack controller, configured to charge the plurality of battery cells, wherein the battery pack controller receives the target balancing value and controls operation of the battery pack discharger and the battery pack charger to adjust a state-of-charge of each of the plurality of battery cells toward the target balancing value by at least; instructing the battery pack charger to charge the plurality of battery cells in response to the state-of-charge of at least one of the plurality of battery cells being below the first threshold related to the target balancing value, and instructing the battery pack discharger to individually discharge one or more of the plurality of battery cells in response to the state-of-charge of the one or more battery cells being above the second threshold related to the target balancing value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification