Abstract: This application discloses a battery cell top cover, a battery cell, a battery, an electric device, and an electrolyte injection nozzle. The battery cell top cover includes a top cover body. The top cover body is provided with an electrolyte injection hole. The electrolyte injection hole includes a first hole section, a second hole section, and a third hole section that are sequentially arranged and communicate with each other in a thickness direction of the top cover body. A first pressing surface is formed between an end of the second hole section facing away from the first hole section and the third hole section. The first pressing surface can abut against a second pressing surface of the electrolyte injection nozzle to implement surface sealing.

Abstract: A separator inlcudes a base film and at least one coating layer. The base film has an upper surface and a lower surface, and has a first direction. The upper surface includes a first edge portion and a second edge portion in the first direction, and the lower surface includes a third edge portion and a fourth edge portion in the first direction. The at least one coating layer is provided at at least one of the first edge portion, the second edge portion, the third edge portion, and the fourth edge portion.

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.