BATTERY SYSTEM AND METHOD FOR DETECTING CURRENT RESTRICTION STATE IN A BATTERY SYSTEM
First Claim
1. A battery system comprising:
- a battery pack that includes at least one parallel battery unit each of which includes a plurality of series battery units each of which includes a current restriction portion and at least one battery cell serially connected to each other, the plurality of series battery units being connected to each other in parallel;
a detecting portion that detects voltage and current of each of the at least one parallel battery unit, and calculates the accumulated current value of each of the at least parallel battery unit;
a storage portion that stores reference voltage values to be associated the accumulated current value of each of the at least one parallel battery unit calculated by said detecting portion; and
a determining portion that reads, from said storage portion, one of the reference voltages corresponding to the accumulated value of each of the at least one parallel battery unit detected by said detecting portion, and compares the read reference voltage with the detection voltage of said each of the at least one parallel battery unit detected by said detecting portion whereby determining that the battery cell current restriction portion is brought in a current restriction state if the difference between the detection voltage and the read reference voltage is larger than a predetermined value.
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Abstract
A battery system includes a battery pack 10, a detecting portion 5, a storage portion 6, and a determining portion 7. The battery pack 10 includes parallel battery units 1. The unit 1 includes a current restriction portion 9 and a plurality of battery cells 2. The cells 2 are connected to each other in parallel. The detecting portion 5 detects voltage and current of each unit, and calculates the accumulated current value of each unit. The storage portion 6 stores reference voltage values to be associated the accumulated current value. The determining portion 7 reads one of the reference voltages corresponding to the accumulated value, and compares the read reference voltage with the detection voltage whereby determining that the current restriction portion is brought in a current restriction state if the difference between the detection voltage and the read reference voltage is larger than a predetermined value.
35 Citations
11 Claims
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1. A battery system comprising:
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a battery pack that includes at least one parallel battery unit each of which includes a plurality of series battery units each of which includes a current restriction portion and at least one battery cell serially connected to each other, the plurality of series battery units being connected to each other in parallel; a detecting portion that detects voltage and current of each of the at least one parallel battery unit, and calculates the accumulated current value of each of the at least parallel battery unit; a storage portion that stores reference voltage values to be associated the accumulated current value of each of the at least one parallel battery unit calculated by said detecting portion; and a determining portion that reads, from said storage portion, one of the reference voltages corresponding to the accumulated value of each of the at least one parallel battery unit detected by said detecting portion, and compares the read reference voltage with the detection voltage of said each of the at least one parallel battery unit detected by said detecting portion whereby determining that the battery cell current restriction portion is brought in a current restriction state if the difference between the detection voltage and the read reference voltage is larger than a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10)
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9. A battery system comprising:
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a battery pack that includes parallel battery units each of which includes a plurality of series battery units each of which includes a current restriction portion and at least one battery cell serially connected to each other, the plurality of series battery units being connected to each other in parallel; a detecting portion that detects voltages of the parallel battery units; and a determining portion that compares a voltage of one of the parallel battery units detected by the detecting portion with voltages of other of the parallel battery units to detect the voltage difference, and determines that the battery cell current restriction portion is brought in a current restriction state if the voltage difference is larger than a predetermined value.
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11. A battery cell current restriction state detection method for detecting a battery cell current restriction state in a battery system that includes a battery pack having at least one parallel battery unit each of which includes a plurality of series battery units each of which includes a current restriction portion and at least one battery cell serially connected to each other, the plurality of series battery units being connected to each other in parallel, wherein the method comprising the steps of:
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detecting voltage and current of each of the at least one parallel battery unit by a detecting portion; calculating the accumulated current value of each of at least one the parallel battery unit; reading, from a storage portion that stores reference voltages, one of the reference voltages corresponding to the accumulated value of each of the at least one parallel battery unit; comparing the read reference voltage with the detection voltage of said each of the at least one parallel battery unit detected by said detecting portion; and determining that the battery cell current restriction portion is brought in a current restriction state if the difference between the detection voltage and the read reference voltage is larger than a predetermined value.
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Specification