Cylindrical sealed battery
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United States of America Patent
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Jan 23, 2018
Issued Date -
N/A
app pub date -
Mar 18, 2015
filing date -
Mar 28, 2014
priority date (Note) -
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Abstract
A nonaqueous electrolyte secondary battery representing an embodiment of a sealed battery of the present invention includes a bottomed cylindrical exterior case (15), a sealing member (20), a cylindrical wound electrode assembly (14) including a positive electrode plate (11) and a negative electrode plate (12) wound together via a separator (13), and an electrolyte. The cylindrical wound electrode assembly (14) and the electrolyte are accommodated in the exterior case (15). An open end of the exterior case (15) is crimped together with the sealing member (20) via an insulating gasket (21) so as to form a seal. The sealing member (20) includes a valving element (23) having a thin and fragile portion (22) and a support element (25) having an opening (24). The support element (25) is disposed on an outer side of the valving element (23), and a portion of the valving element (23) is exposed to an outside environment along the inner periphery of the opening (24) in the support element (25).
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