Abstract: The electrode assembly includes: an electrode plate including an electrode plate body and a tab region; and separator disposed on two opposite sides of the electrode plate. The separators each include a covering portion covering the electrode plate body and an exceeding portion connected to the covering portion, the exceeding portion covering a portion of the tab region, where the exceeding portions on the two opposite sides of the electrode plate are at least partially connected to each other and form a bonding portion, or the exceeding portions on the two opposite sides of the electrode plate are at least partially connected to the tab region and form the bonding portion. The electrode assembly enables two separators to envelop the electrode plate in the width direction of the electrode plate. Even if the separators fold, the electrode plate will not be exposed to the outside.

Abstract: An electrode assembly comprises a first electrode plate, a second electrode plate and a separator. The second electrode plate is stacked with the first electrode plate in the thickness direction of the first electrode plate, and the polarity of the second electrode plate is opposite to that of the first electrode plate. The separator isolates the first electrode plate from the second electrode plate, and is stacked with the first electrode plate in the thickness direction of the first electrode plate. The separator, the first electrode plate and the second electrode plate are wound to form a whole. At a starting end and/or an ending end of the winding of the electrode assembly, at least one of the first electrode plate and the second electrode plate is fixed to the separator by using a connector.

Abstract: A battery cell, a battery, and an electrical device are provided. The battery cell includes a housing, a core assembly, a support positioned at one end of the core assembly, and an insulating member configured to match the support and wrap the core assembly. The core assembly, support, and insulating member are contained within the housing, with at least a portion of the insulating member connected to a wall surface of the support that is distal to the core assembly. This configuration enhances the connection reliability between the insulating member and the support, reduces the risk of the insulating member detaching, minimizes housing corrosion due to core assembly exposure, mitigates core assembly failure, and decreases the likelihood of electrolyte leakage, thereby improving the reliability and stability of the battery cell.

Abstract: A battery cell comprises: a housing, comprising a housing cover and a housing body; a battery cell assembly, comprising an active substance-coated part; and a support arranged at the end of the active substance-coated part distal to the opening of the housing body and fitting the battery cell assembly. The support is provided with a body part and an extension part arranged circumferentially on the body part. The projection of the body part on the plane of the housing cover is within the projection of the active substance-coated part on the plane of the housing cover, and the projection of the extension part on the plane of the housing cover is located outside the projection of the active substance-coated part on the plane of the housing cover.