BATTERY PACK MANUFACTURING METHOD, AND BATTERY PACK
First Claim
1. A method of manufacturing a battery pack comprising in combination a plurality of used secondary batteries, comprising the steps of:
- acquiring an internal resistance value of each of the used secondary batteries having ever been used;
selecting a plurality of the used secondary batteries whose internal resistance values are close to each other from a group of the used secondary batteries whose internal resistance values have been acquired; and
assembling the selected used secondary batteries to constitute the battery pack.
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Accused Products
Abstract
Provided are a battery pack manufacturing method, which can prevent a drawback that some of used secondary batteries constituting a battery pack prematurely come to the end and which can suppress the enlargement of the temporary voltage difference between the used secondary battery at a charging/discharging time (especially in a low-temperature circumstance), and a battery pack. The battery pack manufacturing method comprises an acquiring step (Step S1) of acquiring the individual internal resistances of the secondary batteries already used, a selection step (Step S2) of selecting a plurality of the used secondary batteries having the internal resistances close to each other from a group of the used secondary batteries whose internal resistances have been acquired, and an assembling step (Step S3) of combining the used secondary batteries selected, to constitute the battery pack.
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Citations
3 Claims
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1. A method of manufacturing a battery pack comprising in combination a plurality of used secondary batteries, comprising the steps of:
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acquiring an internal resistance value of each of the used secondary batteries having ever been used; selecting a plurality of the used secondary batteries whose internal resistance values are close to each other from a group of the used secondary batteries whose internal resistance values have been acquired; and assembling the selected used secondary batteries to constitute the battery pack. - View Dependent Claims (2)
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3. A battery pack comprising in combination a plurality of used secondary batteries having ever been used, wherein
a difference in internal resistance value between the used secondary battery having a maximum internal resistance value and the used secondary battery having a minimum internal resistance value among the selected used secondary batteries is 20% or less of the internal resistance value of the used secondary battery having the minimum internal resistance value.
Specification