CHARGE/DISCHARGE SYSTEM FOR BATTERY PACK
First Claim
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1. A charge/discharge system comprising:
- an electric energy storage;
a battery pack in which a plurality of battery cells are disposed in series connection with each other;
a switch which works to selectively establish an electrical connection of a first cell group made up of one or a first number of adjacent ones of the battery cells with the electric energy storage in a first switching operation mode and an electrical connection of a second cell group made up of one or a second number of adjacent ones of the battery cells with the electric energy storage in a second switching operation mode; and
a charge/discharge controller which selectively places the switch in the first switching operation mode to establish a charging mode to charge electric energy from the first cell group to the electric energy storage and the second switching operation mode to establish a discharge mode to discharge electric energy from the electric energy storage to the second cell group.
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Abstract
A charge/discharge system is provided to shuttle electric energy in a battery pack made up of battery cells connected in series. The charge/discharge system includes an electric energy storage, a switch, and a charge/discharge controller. The charge/discharge controller selectively places the switch in a charging mode to charge electric energy from one or a selected number of ones of the battery cells to one or a selected number of other ones of the battery cells to minimize a variation in state of charge among the battery cells.
70 Citations
25 Claims
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1. A charge/discharge system comprising:
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an electric energy storage; a battery pack in which a plurality of battery cells are disposed in series connection with each other; a switch which works to selectively establish an electrical connection of a first cell group made up of one or a first number of adjacent ones of the battery cells with the electric energy storage in a first switching operation mode and an electrical connection of a second cell group made up of one or a second number of adjacent ones of the battery cells with the electric energy storage in a second switching operation mode; and a charge/discharge controller which selectively places the switch in the first switching operation mode to establish a charging mode to charge electric energy from the first cell group to the electric energy storage and the second switching operation mode to establish a discharge mode to discharge electric energy from the electric energy storage to the second cell group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A charge/discharge system comprising:
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a battery pack made up of a plurality of modules connected electrically to each other, each of the modules including a plurality of battery cells connected in series witch each other; a common electric energy storage; in-module electric energy storages each of which is disposed in one of the modules; a common switch which works to selectively establish an electrical connection of a first module group made up of one or a first number of adjacent ones of the modules with the common electric energy storage in a first switching operation mode and an electrical connection of a second module group made up of one or a second number of adjacent ones of the modules with the common electric energy storage in a second switching operation mode; in-module switches each of which is disposed in one of the modules, each of the in-module switches working to selectively establish an electrical connection of a first cell group made up of one or a first number of adjacent ones of the battery cells in a corresponding one of the modules with a corresponding one of the in-module electric energy storages in a third switching operation mode and an electrical connection of a second cell group made up of one or a second number of adjacent ones of the battery cells in a corresponding one of the modules with a corresponding one of the in-module electric energy storage in a fourth switching operation mode; a common charge/discharge controller which selectively places the common switch in the first switching operation mode to establish a charging mode to charge electric energy from the first module group to the common electric energy storage and the second switching operation mode to establish a discharge mode to discharge electric energy from the common electric energy storage to the second module group; and in-module charge/discharge controllers each of which is disposed in one of the modules, each of the in-module charge/discharge controllers selectively placing a corresponding one of the in-module switches in the third switching operation mode to establish an in-module charging mode to charge electric energy from the first cell group to a corresponding one of the in-module electric energy storages and the fourth switching operation mode to establish an in-module discharge mode to discharge electric energy from the one of the electric energy storages to the second cell group; - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification