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Energy storage device

  • US 10,644,293 B2
  • Filed: 04/24/2017
  • Issued: 05/05/2020
  • Est. Priority Date: 04/25/2016
  • Status: Active Grant
First Claim
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1. An energy storage device, comprising:

  • electrode terminals;

    an electrode assembly formed by stacking a positive electrode plate and a negative electrode plate;

    current collectors which connect the electrode terminals and the electrode assembly to each other,wherein at least one of the positive electrode plate and the negative electrode plate includes a plurality of tab groups which are joined to one of the current collectors, each tab group being formed by stacking one or more tabs projecting toward the electrode terminals, andwherein at least one tab group among the tab groups and one current collector among the current collectors include a swaged joint portion, the swaged joint portion projecting from one tab group among the tab groups or one current collector among the current collectors to an other one of the one tab group among the tab groups or the one current collector among the current collectors; and

    a cover material which overlaps with the at least one tab group among the tab groups and is fixed with the at least one tab group among the tab groups, andwherein, in a stacking direction of the cover material on the at least one tab group, a projection portion or a recessed portion extends on a surface of the cover material, and the projection portion or the recessed portion is disposed at a position away from the swaged joint portion.

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