Method and device for detecting a state of charge of a battery assembly, and battery assembly charge and discharge control device
First Claim
1. A method for detecting the state of charge of a battery assembly with a plurality of battery cells connected in series, comprising the steps of:
- detecting a variation in charged amount among a plurality of battery blocks composing said battery assembly and including one or more battery cells in each block;
calculating a movable range of the charged amount on the basis of a detected value of the variation and an upper limit value and a lower limit value of the charged amount of said battery blocks; and
detecting a state of charge showing where in said movable range the present charged amount is positioned.
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Accused Products
Abstract
Variation of the charged amount among battery blocks composing a battery assembly is detected. By subtracting the detected value of the variation from the width between the upper limit value and the lower limit value of the charged amount, the movable range of the charged amount is found. The position of the present charged amount is detected as the state of charge. For example, it is arranged that both ends of the movable range are 0% and 100%, and that the movable range is the full scale. Then, the position of the charged amount on this scale is specified by the ratio %. The detection of the state of charge in which the variation in charged amount and the change of the movable range are considered, is performed, and on the basis of this state of charge, a preferable charge and discharge control is performed.
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Citations
16 Claims
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1. A method for detecting the state of charge of a battery assembly with a plurality of battery cells connected in series, comprising the steps of:
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detecting a variation in charged amount among a plurality of battery blocks composing said battery assembly and including one or more battery cells in each block; calculating a movable range of the charged amount on the basis of a detected value of the variation and an upper limit value and a lower limit value of the charged amount of said battery blocks; and detecting a state of charge showing where in said movable range the present charged amount is positioned.
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2. A device for detecting the state of charge of a battery assembly with a plurality of battery cells connected in series, comprising:
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a variation detecting means for detecting a variation in charged amount among a plurality of battery blocks composing said battery assembly and including one or more battery cells in each block; and a movable range calculating means for calculating a movable range of the charged amount on the basis of a detected value of the variation and an upper limit value and a lower limit value of the charged amount of said battery blocks, wherein the position of the present charged amount within said movable range, is detected as a state of charge. - View Dependent Claims (3, 4)
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5. A device for detecting a state of charge of a battery assembly which can detect a variation in charged amount among a plurality of battery blocks composing the battery assembly and including one or more battery cells in each block, comprising:
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means for detecting a first judging time, which is the time when the charged amount of a battery block having the minimum charged amount has reached a first judgment value; means for detecting a second judging time, which is the time when the charged amount of a battery block having the maximum charged amount has reached a second judgment value; charge and discharge amount measuring means for measuring the amount of charge and discharge between the first judging time and the second judging time; and variation calculating means for calculating a variation in charged amount among battery blocks on the basis of the first judgment value and the second judgment value and a measured value of the amount of charge and discharge. - View Dependent Claims (6)
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7. A charge and discharge control device for a battery assembly comprising a plurality of battery cells connected in series, comprising:
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variation detecting means for detecting a variation in charged amount among a plurality of battery blocks composing said battery assembly and including one or more battery cells in each block; and movable range calculating means for calculating a movable range of the charged amount, on the basis of a detected value of the variation and an upper limit value and a lower limit value of the charged amount of said battery blocks, wherein said control device controls the amount of charge and discharge to the battery assembly so that the charged amount may be in said movable range. - View Dependent Claims (8, 9, 10)
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11. A charge and discharge control device for a battery assembly comprising a plurality of battery cells connected in series, comprising:
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judging means for judging whether or not the charged amount has reached an upper limit value or a lower limit value, for each of a plurality of battery blocks composing said battery assembly and including one or more battery cells in each block; and movable range calculating means for finding the movable range of the charged amount, which is the range of the charged amount between the state when the charged amount of a battery block having the minimum charged amount has reached the lower limit value and the state when the charged amount of a battery block having the maximum charged amount has reached the upper limit value, wherein said control device controls the amount of charge and discharge to the battery assembly so that the charged amount may be in said movable range. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification