Lithium ion secondary battery and battery pack
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United States of America Patent
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Nov 9, 2021
Grant Date -
Mar 1, 2018
app pub date -
Aug 22, 2017
filing date -
Aug 26, 2016
priority date (Note) -
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Abstract
The present teaching provides a highly durable lithium ion secondary battery including a flat shape wound electrode body, with which a high capacity retention ratio and suppression of resistance rise are realized, and also provides a battery pack constructed by using the secondary battery as a unit battery. The lithium ion secondary battery (unit battery) provided in accordance with the present teaching has a flat-shaped wound electrode body 20, and in a state in which a constraint pressure is applied in the direction toward the flat surface of the wound electrode body under the same conditions as the conditions when the battery pack is constructed, the condition of a D/B ratio being 1.01 or more and 1.07 or less is satisfied, where, in the lateral cross section of the wound electrode body, a thickness from an inner curve apex V to an outer curve apex P is taken as a center thickness D of a curved R portion, and a thickness from the inner curve apex V to an outer surface S of the wound electrode body along an R portion/F portion boundary line W is taken as a boundary thickness B of the curved R portion.
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