BATTERY ELECTRODE SHEET AND MANUFACTURING METHOD THEREFOR
First Claim
1. An electrode sheet comprising:
- a sheet of metal foil;
at least one region coated with at least one active material layer subjected to working by rolling, the at least one coated region being provided in at least one central portion of the sheet of metal foil;
at least one region uncoated with the at least one active material layer, the at least one uncoated region being provided in at least one edge portion of the sheet of metal foil; and
at least one region subjected to working by drawing, the at least one drawn region being provided in at least a portion of the at least one uncoated region.
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Accused Products
Abstract
Embodiments of the present invention provide such things as an electrode sheet having little curl for a spiral wound battery and a manufacturing method therefor.
An electrode sheet is such that active material layer(s) is/are present and has/have been subjected to working by rolling at entire surface(s) thereof, except for at least one uncoated region U, of electrode sheets) comprising sheet(s) of metal foil(s) S. Moreover, drawn region(s) is/are provided at region(s) uncoated with active material layer(s) in such uncoated region(s) U. By thus creating drawn region(s) at uncoated region(s) of the electrode sheet, curling of the electrode sheet is suppressed, and furthermore, when tension is applied to carry out winding of the electrode sheet and/or convey the electrode sheet to subsequent operation(s), there is reduced likelihood of occurrence of wrinkling and/or tearing in the long direction of the electrode sheet.
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Citations
19 Claims
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1. An electrode sheet comprising:
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a sheet of metal foil; at least one region coated with at least one active material layer subjected to working by rolling, the at least one coated region being provided in at least one central portion of the sheet of metal foil; at least one region uncoated with the at least one active material layer, the at least one uncoated region being provided in at least one edge portion of the sheet of metal foil; and at least one region subjected to working by drawing, the at least one drawn region being provided in at least a portion of the at least one uncoated region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electrode sheet manufacturing method, the method comprising:
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preparing an electrode sheet having at least one region coated with at least one active material layer, the at least one coated region being created in at least one central portion of the electrode sheet, and at least one region uncoated with the at least one active material, the uncoated region being created in at least one edge portion of the electrode sheet; subjecting a portion of the at least one uncoated region to working by a press so as to create at least one drawn region; and subjecting the at least one coated region to working by rolling. - View Dependent Claims (10, 11, 12, 13)
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14. An electrode sheet comprising:
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a sheet-like metal thin film; a coated region which is coated with an active material layer subjected to working by rolling, the coated region being provided in a central portion of the metal thin film; an uncoated region which is not coated with the active material layer, the uncoated region being provided in an edge portion of the metal thin film; and a drawn region which is subjected to working by drawing, the drawn region being provided in at least a portion of the uncoated region. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification