| CPC H01M 50/54 (2021.01) [H01M 50/103 (2021.01); H01M 50/528 (2021.01); H01M 50/543 (2021.01); H01M 50/583 (2021.01)] | 6 Claims |
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1. A secondary battery comprising:
an electrode body configured such that a positive electrode plate and a negative electrode plate are stacked on each other with a separator being interposed therebetween; an exterior body having an opening and housing the electrode body;
a sealing plate sealing the opening; and
an external terminal attached to the sealing plate, wherein:
a tab provided at least at one of the positive electrode plate or the negative electrode plate is electrically connected to the external terminal via a current collector arranged between the electrode body and the sealing plate,
the current collector has a first connection portion connected to the tab or a tab conductive member connected to the tab and a second connection portion with a fuse portion having a slit,
the fuse portion is a portion formed with a minimum sectional area perpendicular to a current direction in a current path from the tab to the external terminal such that the fuse portion is fused when overcurrent flows in the current path,
a portion of the fuse portion facing the electrode body is covered with a fuse portion insulating member,
the fuse portion insulating member includes a plate portion and a raised portion protruding from the plate portion,
the raised portion is inserted into the slit of the fuse portion, and
the fuse portion insulating member is a member made of a material whose melting point is 200° C. or higher.
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