Abnormality diagnosis device and method for battery pack
First Claim
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1. An abnormality diagnosis device for a battery pack comprising a plurality of parallel blocks, each of which comprises a plurality of cells connected in parallel, and which are themselves connected in series, comprising:
- a voltage detection device which detects a voltage of each parallel block of the battery pack; and
an abnormality determination device which performs a diagnosis of abnormality of the cells connected in parallel within each parallel block, based upon an amount of change of the voltage of each parallel block before and after discharge or before and after charge, of the battery pack, whereinthe abnormality determination device obtains the amount of change of the voltage of each parallel block before and after discharge or before and after charge, of the battery pack, and determines that an abnormal cell is included in the parallel block if the amount of charge of the voltage of the parallel block is greater than a predetermined value.
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Abstract
In a battery pack which includes a plurality of parallel blocks, each of which comprises a plurality of cells connected in parallel, and which are themselves connected in series, the voltage of each parallel block of the battery pack before and after discharge or before and after charge of a predetermined amount of capacity is detected, and abnormality of the cells connected in parallel within each parallel block is determined based upon the amount of change of voltage of each parallel block.
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Citations
21 Claims
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1. An abnormality diagnosis device for a battery pack comprising a plurality of parallel blocks, each of which comprises a plurality of cells connected in parallel, and which are themselves connected in series, comprising:
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a voltage detection device which detects a voltage of each parallel block of the battery pack; and an abnormality determination device which performs a diagnosis of abnormality of the cells connected in parallel within each parallel block, based upon an amount of change of the voltage of each parallel block before and after discharge or before and after charge, of the battery pack, wherein the abnormality determination device obtains the amount of change of the voltage of each parallel block before and after discharge or before and after charge, of the battery pack, and determines that an abnormal cell is included in the parallel block if the amount of charge of the voltage of the parallel block is greater than a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An abnormality diagnosis device for a battery pack comprising a plurality of parallel blocks, each of which comprises a plurality of cells connected in parallel, and which are themselves connected in series, comprising:
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a voltage detection means for detecting a voltage of each parallel block of the battery pack; and an abnormality determination means for performing a diagnosis of abnormality of the cells connected in parallel within each parallel block, based upon an amount of change of the voltage of each parallel block before and after discharge or before and after charge, of the battery pack, wherein the abnormality determination means obtains the amount of change of the voltage of each parallel block before and after discharge or before and after charge, of the battery pack, and determines that an abnormal cell is included in the parallel block if the amount of change of the voltage of the parallel block is greater than a predetermined value.
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12. An abnormality diagnosis method for a battery pack comprising a plurality of parallel blocks, each of which comprises a plurality of cells connected in parallel, and which are themselves connected in series, comprising:
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detecting a voltage of each parallel block of the battery pack before and after discharge or before and after charged of the battery pack; and performing a diagnosis of an abnormality of the cells connected in parallel within each parallel block based upon an amount of change of the voltage of each parallel block, wherein the amount of change of the voltage of each parallel block is obtained before and after discharge or before and after charge, of the battery pack, and it is determined that an abnormal cell is included in the parallel block if the amount of change of the voltage of the parallel block is greater than a predetermined value. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification