METHOD FOR SORTING USED SECONDARY BATTERY, REBUILT BATTERY PACK, VEHICLE AND BATTERY OPERATED DEVICE INCORPORATING SAME, AND METHOD FOR MANUFACTURING REBUILT BATTERY PACK
First Claim
1. A method for sorting a used secondary battery having been already used, the battery having characteristics such thatin an initial stage of a usable period, a battery resistance is gradually reduced and an initial-stage high-resistance period having a relatively high battery resistance appears,in a middle stage of the usable period, a middle-stage low-resistance period having a relatively low battery resistance appears, andin an ending stage of the usable period, the battery resistance is gradually raised and an ending-stage high-resistance period having a relatively high battery resistance appears,wherein the method includes:
- a resistance measuring step of measuring the battery resistance of the used secondary battery; and
a resistance distinguishing step of distinguishing whether the battery resistance of the used secondary battery is high or low as compared with a period threshold identifying whether the used secondary battery is present in one of the initial-stage high-resistance period or ending-stage high-resistance period and the middle-stage low-resistance period.
1 Assignment
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Accused Products
Abstract
Disclosed are a method for adequately sorting used secondary batteries; a rebuilt battery pack that incorporates the used batteries sorted by the sorting method and have identical characteristics; a vehicle and a battery operated device which use the rebuilt battery pack; and a method for manufacturing a rebuilt battery pack which employs used batteries having identical characteristics. The method for sorting used secondary batteries includes a resistance measurement step for measuring the battery resistance of a battery the characteristics of which show a bathtub curve with respect to the period of use. The method further includes a resistance distinguishing step for distinguishing whether the battery resistance of the battery is greater or less than a period threshold value for identifying to which one of the following periods the battery belongs: an initial-stage high-resistance period, and end-stage high-resistance period, and a middle-stage low-resistance period.
21 Citations
18 Claims
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1. A method for sorting a used secondary battery having been already used, the battery having characteristics such that
in an initial stage of a usable period, a battery resistance is gradually reduced and an initial-stage high-resistance period having a relatively high battery resistance appears, in a middle stage of the usable period, a middle-stage low-resistance period having a relatively low battery resistance appears, and in an ending stage of the usable period, the battery resistance is gradually raised and an ending-stage high-resistance period having a relatively high battery resistance appears, wherein the method includes: -
a resistance measuring step of measuring the battery resistance of the used secondary battery; and a resistance distinguishing step of distinguishing whether the battery resistance of the used secondary battery is high or low as compared with a period threshold identifying whether the used secondary battery is present in one of the initial-stage high-resistance period or ending-stage high-resistance period and the middle-stage low-resistance period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 15, 16, 17)
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9. A rebuilt battery pack reconstituted by collecting a plurality of used secondary batteries having been already used, the batteries having characteristics such that
in an initial stage of a usable period, a battery resistance is gradually reduced and an initial-stage high-resistance period having a relatively high battery resistance appears, in a middle stage of the usable period, a middle-stage low-resistance period having a relatively low battery resistance appears, and in an ending stage of the usable period, the battery resistance is gradually raised and an ending-stage high-resistance period having a relatively high battery resistance appears, wherein each of the used secondary batteries belongs to the middle-stage low-resistance period.
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12. A method of manufacturing a rebuilt battery pack reconstituted by collecting a plurality of used secondary batteries having been already used, the batteries having characteristics such that
in an initial stage of a usable period, a battery resistance is gradually reduced and an initial-stage high-resistance period having a relatively high battery resistance appears, in a middle stage of the usable period, a middle-stage low-resistance period having a relatively low battery resistance appears, and in an ending stage of the usable period, the battery resistance is gradually raised and an ending-stage high-resistance period having a relatively high battery resistance appears, wherein the method includes: -
a resistance distinguishing step of distinguishing whether the battery resistance of the used secondary battery is high or low as compared with a period threshold identifying whether the used secondary battery is present in one of the initial-stage high-resistance period or ending-stage high-resistance period and the middle-stage low-resistance period; and a first type reconstituting step of collecting the used secondary batteries having the lower battery resistance than the period threshold to reconstitute the battery pack. - View Dependent Claims (13, 14)
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Specification