Abstract: An outermost electrode plate of an electrode assembly is a first outer electrode plate, where the first outer electrode plate includes a first current collector and a first active material layer; the first current collector has a first surface facing a first direction and a second surface facing a second direction; the first active material layer is disposed on the second surface; the first direction is a stacking direction of electrode plates and separators of the electrode assembly; and the second direction is opposite to the first direction. The secondary battery further includes a plurality of first adhesive layers, where a portion of the first adhesive layer is bonded between the first surface and an inner wall of an accommodating portion, and another portion of the first adhesive layer is bonded to the first surface and at least a portion of the separator.

Abstract: An electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate; and the positive electrode plate, the negative electrode plate, and the separator are stacked. An outermost electrode plate of the electrode assembly is a single-sided positive electrode plate. The single-sided positive electrode plate includes a positive electrode current collector, a first positive electrode material layer, and a second positive electrode material layer stacked sequentially. The first positive electrode material layer is located between the positive electrode current collector and the second positive electrode material layer. The second positive electrode material layer is adjacent to the separator. The first positive electrode material layer includes a first positive electrode active substance, a first binder, and a first conductive agent.