Film-covered battery
AssigneeNEC Energy Devices, Ltd.
InventorsTomoyuki Ichikawa, Ikuo Kojima
Life of this patent
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Abstract
A film-covered battery houses, in a film covering material 4 obtained by stacking a heat sealing layer 13, a barrier layer 12, and a protective layer 11, a battery element 6 obtained by arranging positive and negative electrodes through separators and has a sealing portion that seals a periphery of the film covering material 4 housing the battery element 6. The sealing portion 18 includes an agglomeration/sealing portion 19 and a first interface bonding portion 15 provided so as to be adjacent to the battery element housing portion side of the agglomeration/sealing portion.
Claims8
A film-covered battery that houses, in a film covering material obtained by stacking a heat sealing layer, a barrier layer, and a protective layer, a battery element obtained by arranging positive and negative electrodes through separators and that has a sealing portion that seals a periphery of the film covering material housing the battery element, characterized in that the sealing portion includes:
- an agglomeration/sealing portion, formed of two unified heat sealing layers that do not have a boundary therebetween;
- and a first interface bonding portion having a boundary surface between the heat sealing layers, the first interface bonding portion being adjacent to the battery element housing portion side of the agglomeration/sealing portion.
Dependencies are inferred from the claim text.