RECONSTRUCTED BATTERY PACK APPLICABILITY DETERMINATION METHOD FOR USED SECONDARY BATTERY, AND RECONSTRUCTION METHOD FOR RECONSTRUCTED BATTERY PACK
First Claim
1. A determination method for a used secondary battery by a computer, the used secondary battery including a separator, the determination method comprising:
- comparing, by the computer, an alternating-current internal resistance threshold with an alternating-current internal resistance value, the alternating-current internal resistance value being acquired by applying an alternating-current signal having a predetermined frequency to a first secondary battery, the first secondary battery being the used secondary battery intended for determination, the alternating-current internal resistance threshold being a value corresponding to a liquid retention amount threshold of the separator of the first secondary battery, the liquid retention amount threshold being a liquid retention amount of a separator of a second secondary battery, the second secondary battery being a secondary battery of the same type as the used secondary battery intended for determination, the liquid retention amount threshold being a preset value; and
determining, by the computer, whether the first secondary battery is allowed to be applied to a reconstructed battery pack, the reconstructed battery pack being a battery pack formed of a plurality of used secondary batteries.
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Abstract
A determination method for a used secondary battery is provided. The determination method includes: comparing an alternating-current internal resistance threshold with an alternating-current internal resistance value; and determining whether a first secondary battery is allowed to be applied to a reconstructed battery pack. The alternating-current internal resistance value is acquired by applying an alternating-current signal having a predetermined frequency to the first secondary battery. The first secondary battery is the used secondary battery intended for determination. The alternating-current internal resistance threshold is a value corresponding to a liquid retention amount threshold of the separator of the first secondary battery. The liquid retention amount threshold is a liquid retention amount of a separator of a second secondary battery. The second secondary battery is the same type as the used secondary battery intended for determination. The reconstructed battery pack is formed of a plurality of the used secondary batteries.
13 Citations
8 Claims
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1. A determination method for a used secondary battery by a computer, the used secondary battery including a separator, the determination method comprising:
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comparing, by the computer, an alternating-current internal resistance threshold with an alternating-current internal resistance value, the alternating-current internal resistance value being acquired by applying an alternating-current signal having a predetermined frequency to a first secondary battery, the first secondary battery being the used secondary battery intended for determination, the alternating-current internal resistance threshold being a value corresponding to a liquid retention amount threshold of the separator of the first secondary battery, the liquid retention amount threshold being a liquid retention amount of a separator of a second secondary battery, the second secondary battery being a secondary battery of the same type as the used secondary battery intended for determination, the liquid retention amount threshold being a preset value; and determining, by the computer, whether the first secondary battery is allowed to be applied to a reconstructed battery pack, the reconstructed battery pack being a battery pack formed of a plurality of used secondary batteries. - View Dependent Claims (2, 3, 4, 5)
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6. A reconstruction method for a reconstructed battery pack, the reconstructed battery pack being a battery pack that is reconstructed of predetermined used secondary batteries, each of the predetermined used secondary batteries being a used secondary battery that allows a guarantee against degradation, the secondary battery that allows a guarantee against degradation being selected from among a plurality of used secondary batteries that constitute a used battery pack by determining by a computer whether the used secondary battery is a secondary battery that allows a guarantee against degradation, the reconstruction method comprising:
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(a) setting, by the computer, an alternating-current internal resistance value corresponding to a liquid retention amount threshold of a first secondary battery as an alternating-current internal resistance threshold, the first secondary battery being the used secondary battery intended for determination, the liquid retention amount threshold being a value that is set on the basis of a rate of decrease in the liquid retention amount, the liquid retention amount threshold being set as the liquid retention amount at a time point a predetermined degradation guarantee period before from the liquid retention amount at a time point at which the second secondary battery is determined to degrade, the second secondary battery being a secondary battery of the same type as the used secondary battery intended for determination, the liquid retention amount being a liquid retention amount of a separator of the second secondary battery, the degradation guarantee period being a period during which a usable state of the second secondary battery is guaranteed; (b) selecting, by the computer, the used secondary battery, of which the alternating-current internal resistance value is smaller than the alternating-current internal resistance threshold, as the used secondary battery that allows a guarantee against degradation, the alternating-current internal resistance value being the alternating-current internal resistance value of the first secondary battery; and (c) reconstructing a battery pack by using the selected used secondary batteries. - View Dependent Claims (7, 8)
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Specification