Capacitor
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United States of America Patent
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Nov 15, 2016
Grant Date -
Nov 12, 2015
app pub date -
Dec 18, 2012
filing date -
Dec 27, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
The present application provides a capacitor in which the operability of the pressure valve, and valve deformation during operation, can be stabilized. A capacitor (1) comprising: a capacitor element (6) obtained by overlapping and winding a positive electrode foil (8) and a negative electrode foil (7) with an electrolytic paper (9) interposed therebetween, and impregnating the foils with an electrolytic solution; a bottomed cylindrical outer case (4) for housing the capacitor element (6); and a sealing body (2) for sealing the opening of the outer case (4). The inner bottom part of the outer case (4) has formed thereon a recess (21) having: a first inclined surface (22) spreading in a radial manner from the center region of the inner bottom part, the center region being the deepest part; and a second inclined surface (23) which is continuous from the outer edge of the first inclined surface (22) and which is steeper than the first inclined surface (22). A weakened section is formed in the recess, and a groove is formed on the outside of the inner bottom part of the outer case.
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