Secondary battery and preparation method thereof

A secondary battery comprising an accommodating portion and an electrode assembly accommodated within the accommodating portion wherein the electrode assembly comprises a plurality of positive electrode plates, separators, and a plurality of negative electrode plates;

• the plurality of positive electrode plates and the plurality of negative electrode plates are alternately stacked along a first direction;
• and the separators are disposed between adjacent positive electrode plates and negative electrode plates;
• wherein
• along the first direction an outermost electrode plate of the electrode assembly is a first outer electrode plate wherein the first outer electrode plate comprises a first current collector and a first active material layer;
• the first current collector has a first surface and a second surface facing opposite to each other along the first direction;
• the first active material layer is disposed on the second surface the first direction is a stacking direction;
• and
• the secondary battery further comprises a first adhesive layer wherein a portion of the first adhesive layer is bonded between the first surface and an inner wall of the accommodating portion and another portion of the first adhesive layer is bonded to the first surface and at least a portion of one of the separators.