Electrode assembly, battery cell, battery and electric device
AssigneeContemporary Amperex Technology (Hong Kong) Limited
InventorsZhisheng Chai, Haizu Jin
Life of this patent
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Abstract
An electrode assembly, a battery cell, a battery, and an electric device are provided. The electrode assembly includes two electrode sheets having opposite polarities and a separator used for separating the two electrode sheets, the two electrode sheets and the separator being wound in a winding direction to form a main body and two tabs. The tabs and the main body are arranged in a first direction; each tab comprises a plurality of tab portions arranged at intervals in the winding direction; the tab portions are bent relative to the first direction; at least parts of the plurality of tab portions are stacked in the first direction; and a protrusion is formed on at least one side of each tab portion in the thickness direction thereof.
Claims19
An electrode assembly, comprising:
- two electrode sheets with opposite polarities and a separator configured for isolating the two electrode sheets, wherein the two electrode sheets and the separator are wound in a winding direction to form a main body and two tabs,
- wherein the tabs and the main body are provided in a first direction, the tabs each comprises a plurality of tab portions provided at intervals in the winding direction, the tab portions are each bent relative to the first direction, at least some of the plurality of tab portions are stacked in the first direction, and at least one protrusion is provided on at least one side of each of the tab portions in a thickness direction thereof,
- wherein each of the two electrode sheets includes a body part, with the plurality of tab portions connected to one end of the body part in the first direction, the body part of the each of the two electrode sheets and the separator are wound in the winding direction to form the main body,
- each of the two electrode sheets includes a substrate and an active material layer disposed on at least one side of the substrate, the substrate includes a coating region and a spacing region, the coating region and the spacing region being arranged along the first direction, the active material layer is disposed in the coating region, and the spacing region connects the coating region and one of the tab portions, and
- the at least one protrusion of each of the tab portions is spaced apart from the body part of the each of the two electrode sheets along the first direction,
- wherein in the thickness direction of the tab portion, the tab portion comprises a plurality of foils stacked, each of the foils has one side provided with at least one convex portion and the other side provided with at least one concave portion at least one position corresponding to the at least one convex portion, and in two adjacent foils, at least one convex portion of one foil is accommodated in at least one concave portion of the other foil, and
- wherein in the thickness direction of the tab portion, the at least one convex portion located on one side of the tab portion is the at least one protrusion.
Dependencies are inferred from the claim text.