Electrode assembly and secondary battery

A secondary battery, comprising a case, a cap assembly and an electrode assembly;

• wherein the case comprises an accommodating cavity, the electrode assembly is accommodated in the accommodating cavity, and the cap assembly being connected with the case;
• wherein the electrode assembly comprises a first electrode plate, a second electrode plate, and a separator separating the first electrode plate and the second electrode plate, the separator comprising a first separator and a second separator respectively positioned at and adjacent to an outer side and an inner side of the second electrode plate;
• wherein the electrode assembly is wound to a flat structure, the flat structure comprises a main region and a comer region, and the comer region is provided at an end of the main region along a width direction of the main region;
• wherein the first electrode plate, the first and second separators, and the second electrode plate are wound to turns;
• wherein a first gap and a second gap are provided between two adjacent turns of the first electrode plate, the first gap corresponds to the comer region in position, the second gap corresponds to the main region in position, and a dimension of the first gap is larger than a dimension of the second gap,
• wherein, the second electrode plate is provided with a plurality of first protrusions and a plurality of second protrusions, the first protrusions correspond to the comer region in position, the second protrusions correspond to the main region in position, the first protrusions and the second protrusions protrude from the outer side of the second electrode plate outwardly to toward the first separator adjacent to the second electrode plate,
• wherein a third gap and a fourth gap are provided between the second electrode plate and the first separator adjacent to the second electrode plate, the third gap corresponds to the comer region in position, the fourth gap corresponds to the main region in position, a dimension of the third gap is equal to a height of the first protrusions, and a dimension of the fourth gap is equal to the height of the second protrusions, and
• wherein the height of the first protrusions is larger than the height of the second protrusions, the height of the first protrusions is less than 80 μm, and the height of the second protrusions is less than 20 μm.