Abstract: A battery cell includes an electrode assembly and a packaging bag. The electrode assembly includes first electrode plates, second electrode plates and separators. The first electrode plates include two outer electrode plates and at least one inner electrode plate. In the first direction, the two outer electrode plates are disposed on two outermost sides of the electrode assembly respectively, the inner electrode plate is disposed between the two outer electrode plates, and the second electrode plates are disposed between the two outer electrode plates. The packaging bag includes a metal layer, and a relationship between a first strength S1 of the first current collectors in the outer electrode plates and a second strength S2 of the metal layer satisfies: 0.2 ?S1/S2?0.5.

Abstract: A battery cell includes a first electrode plate and a second electrode plate that are alternately stacked. A separator is disposed between the first electrode plate and the second electrode plate. The first electrode plate includes a first current collector and a first active material layer disposed on the first current collector. The first active material layer includes a body portion and an end portion. The end portion is provided with a raised structure and a transition section. The transition section is adjacent to the body portion and the raised structure. In a thickness direction of the battery cell, a distance from a lowest point of a surface of the transition section to a surface of the first current collector is hr, and a thickness of the body portion of the first active material layer is ha, where (ha?hr)/ha?2%.

Abstract: An electrochemical device includes a housing, an electrode assembly, and an insulating tape. The electrode assembly includes a first electrode plate, a second electrode plate and a separator. The insulating tape includes a body portion and a first connecting portion. The electrode assembly includes a first surface and a second surface opposite to each other. The body portion is disposed on the first surface, and is fixedly bonded to the electrode assembly and the housing separately. The first connecting portion is formed together with the body portion in one piece. A first end of the first connecting portion is connected to the body portion, and a second end of the first connecting portion is disposed on the second surface, and is fixedly bonded to the electrode assembly and the housing separately. The first connecting portion is bonded to an edge of the separator.