Negative electrode sheet and method for preparing the same, secondary battery, battery module, battery pack, and electrical apparatus
AssigneeContemporary Amperex Technology (Hong Kong) Limited
InventorsCaixia Huang, Shaobing Ge, Minghao Tang
Life of this patent
Estimating the term…
Abstract
A negative electrode sheet may comprise a negative electrode current collector and a negative electrode film layer, at least one surface of the negative electrode current collector may be superposedly provided with two or more negative electrode film layers, adjacent negative electrode film layers may be bonded at a plurality of bonding points by a conductive adhesive having a raised structure, and there may be a gap between the adjacent negative electrode film layers at non-bonding points.
Claims21
A negative electrode sheet, comprising a negative electrode current collector and a negative electrode film layer, wherein the negative electrode film layer comprises a plurality of negative electrode film layers, at least one surface of the negative electrode current collector is superposedly provided with two or more of the plurality of negative electrode film layers, the negative electrode film layers that are adjacent are bonded at a plurality of bonding points by a conductive adhesive having a raised structure, and there is a gap between the negative electrode film layers that are adjacent at non-bonding points, and
- wherein a spacing between the bonding points that are adjacent along a length direction of the negative electrode film layer is in a range of 30-50 mm;
- and/or a spacing between the bonding points that are adjacent along a width direction of the negative electrode film layer is in a range of 50-100 mm.
A method for preparing a negative electrode sheet, comprising the following steps:
- (1) arranging a plurality of bonding points on a negative electrode film layer supported by a negative electrode current collector, and coating a conductive adhesive having a raised structure at the bonding points;
- (2) bonding a negative electrode film layer supported by a substrate and the negative electrode film layer supported by the negative electrode current collector under an action of pressure by the conductive adhesive having the raised structure, and leaving a gap at non-bonding points, and peeling off the substrate to obtain the negative electrode sheet;
- optionally, repeating steps (1) to (2),
- wherein a spacing between the bonding points that are adjacent along a length direction of the negative electrode film layer is in a range of 30-50 mm;
- and/or a spacing between the bonding points that are adjacent along a width direction of the negative electrode film layer is in a range of 50-100 mm.
Dependencies are inferred from the claim text.