Secondary battery, electronic device, and electrode plate manufacturing method

An electronic device, the electronic device comprises a secondary battery, wherein, the secondary battery comprises:

• a housing;
• and
• an electrode assembly disposed in the housing;
• wherein, the electrode assembly comprises a first electrode plate, a second electrode plate, and a separator disposed between the first electrode plate and the second electrode plate;
• the first electrode plate, the second electrode plate, and the separator are stacked and wound to form a jelly-roll structure;
• wherein,
• along a winding direction of the electrode assembly, the electrode assembly comprises a first straight portion, a first curved portion, a second straight portion, and a second curved portion that are disposed sequentially;
• the first straight portion and the second straight portion each comprise a first part, a second part, and a third part disposed sequentially;
• the first part is connected to the first curved portion and the second part, the third part is connected to the second curved portion and the second part;
• and along the winding direction of the electrode assembly, a length of the first part is D1, and a length of the third part is D2, wherein,
• 0
• ≤
• D
• 1
• ≤
• 5
• ⁢
• mm
• ,
• 0
• ≤
• D
• 2
• ≤
• 5
• ⁢
• mm
• ;
• along a thickness direction of the first electrode plate, the first electrode plate is recessed in at least one of the first curved portion, the second curved portion, the first part, or the third part, so as to form at least one first recessed portion;
• at least one second recessed portion is provided in each first recessed portion;
• and
• the each first recessed portion and the at least one second recessed portion in the each first recessed portion are recessed in a same direction.