SEALING BODY AND BATTERY
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United States of America Patent
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Issued Date -
Nov 19, 2020
app pub date -
Dec 21, 2018
filing date -
Feb 16, 2018
priority date (Note) -
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status (Latency Note)
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Abstract
Provided is a nickel-hydrogen secondary battery 2 comprising a sealing body 11 that seals an opening of an outer can 10, the sealing body 11 includes a sealing plate 14, and a positive electrode cap 20 welded to the sealing plate 14, the positive electrode cap 20 includes a cylindrical body section 40, an annular flange 42 provided along a circumferential edge of an opening 45 located at a base end 41 of the body section 40, and a top wall 44 provided to close a tip 43 opposite to the base end 41, and a welded part 60 between the sealing plate 14 and the positive electrode cap 20 is located at a position where a ratio of X to R in percentage is 0% or more and 2% or less, in which R is a length from a center C of the flange 42 to an outer circumferential edge 64 of the flange, and X is a length from an edge 66 of the welded part 60 on an outer side in a radial direction of the flange to the outer circumferential edge 64 of the flange.
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