Laminate packaging flat cell
View Patent ↗A laminate packaging flat cell comprises a laminate film formed by combining polymer and metal with each other; a power generating element formed of a plurality of electrode plates and separators, and hermetically sealed by the laminate film; and an electrode terminal lead coupled to the electrode plate. In the laminate packaging flat cell of the present invention, the power generating element is hermetically sealed by forming a thermally welded portion on an outer periphery of the laminate film, and the electrode terminal lead protrudes from the thermally welded portion, and a through-hole is provided in a position thereof contacting the thermally welded portion.
1. A laminate packaging flat cell, comprising:
a laminate film formed by combining polymer and metal with each other;
a power generating element formed of a plurality of electrode plates and separators, and hermetically sealed by the laminate film; and
an electrode terminal lead coupled to the electrode plate,
wherein the power generating element is hermetically sealed by forming a thermally welded portion on an outer periphery of the laminate film, and
wherein the electrode terminal lead protrudes from the thermally welded portion in a protruding direction, a plurality of through-holes are provided in the electrode terminal lead in a position thereof contacting the thermally welded portion, the through-holes form first and second rows along a widthwise direction of the electrode terminal lead that is substantially perpendicular to the protruding direction, the through-holes in the first row are arranged to offset to the through-holes in the second row without a gap in the widthwise direction when viewed along the protruding direction, and a ratio of a cross-sectional area of the through-holes to a cross-sectional area of the electrode terminal lead along the widthwise direction ranges from 20 to 50%.
2. A laminate packaging flat cell according to claim 1 , wherein an adhesive layer is provided on at least one surface of the electrode terminal lead.
3. A laminate packaging flat cell according to claim 1 , wherein an end of the laminate film joined to the electrode terminal lead is folded on itself.
4. A laminate packaging flat cell according to claim 1 ,
wherein the through-holes are elongated along a widthwise direction of the electrode terminal lead that is substantially perpendicular to the protruding direction.
5. A laminate packaging flat cell according to claim 4 ,
wherein the electrode terminal lead further comprises a plurality of through holes.
6. A laminate packaging flat cell according to claim 4 ,
wherein said through holes are arcuately-shaped.
7. A method for manufacturing a laminate packaging flat cell, comprising:
preparing a laminate film formed by combining polymer and metal with each other; a power generating element formed of a plurality of electrode plates and separators, and hermetically sealed in the laminate film by forming a thermally welded portion on an outer periphery of the laminate film; and an electrode terminal lead coupled to the electrode plate protruding from the thermally welded portion in a protruding portion, and having a plurality of through-holes provided in the electrode terminal lead in a contact portion with the thermally welded portion, the through-holes form first and second rows along a widthwise direction of the electrode terminal lead that is substantially perpendicular to the protruding direction, the through-holes in the first row are arranged to offset to the through-holes in the second row without a gap in the widthwise direction when viewed along the protruding direction, and a ratio of a cross-sectional area of the through-holes to a cross-sectional area of the electrode terminal lead along the widthwise direction ranges from 20 to 50%;
attaching an adhesive layer onto the contact portion of at least one surface of the electrode terminal lead; and
forming the thermally welded portion by thermally welding the laminate film while interposing the adhesive layer therebetween, and hermetically sealing the power generating element.
8. A laminate packaging flat cell, comprising:
a laminate film formed by combining polymer and metal with each other;
a power generating element formed of a plurality of electrode plates and separators, and hermetically sealed by the laminate film; and
an electrode terminal lead coupled to the electrode plate,
wherein the power generating element is hermetically sealed by forming a thermally welded portion on an outer periphery of the laminate film, and
wherein the electrode terminal lead protrudes from the thermally welded portion in a protruding direction, a plurality of through-holes are provided in the electrode terminal lead in a position thereof contacting the thermally welded portion, the through-holes being arranged to prevent leakage of electrolyte linearly along the protruding direction through a location of the thermally welded portion of the laminate film where the terminal electrode lead protrudes, and a ratio of a cross-sectional area of the through-holes to a cross-sectional area of the electrode terminal lead along the widthwise direction ranges from 20 to 50%.