Electrode assembly, battery cell, battery, and electric device

An electrode assembly, comprising a first electrode plate and a second electrode plate that have opposite polarities, wherein the first electrode plate and the second electrode plate are stacked;

• the first electrode plate comprises a first active substance portion and a plurality of first inactive substance portions protruding from the first active substance portion, and the plurality of first inactive substance portions are stacked to form a stacked portion;
• a connection layer is disposed between at least two adjacent first inactive substance portions in the stacked portion, and the connection layer is spaced from the first active substance portion in a first direction and connects two adjacent first inactive substance portions, wherein the first direction is a direction in which the first inactive substance portions protrude from the first active substance portion;
• the second electrode plate comprises a second active substance portion and a plurality of second inactive substance portions protruding from the second active substance portion, and the plurality of second inactive substance portions are stacked;
• the electrode assembly further comprises a separation structure between the first electrode plate and the second electrode plate, wherein the separation structure comprises a separation portion and a protruding portion directly protruding from the separation portion, and the separation portion separates the first active substance portion from the second active substance portion, the separation portion and the protruding portion of the separation structure each are made of a same material and each have through micropores;
• and
• an end part of the protruding portion of the separation structure facing away from the separation portion is located between two adjacent first inactive substance portions, and the connection layer fastens the end part to the first inactive substance portions,
• wherein the connection layer is colloid and is bonded directly to surfaces of the at least two adjacent first inactive substance portions in the stacked portion.