Electrode plate, battery cell, and electronic device

A battery cell, wherein the battery cell comprises an electrode assembly;

• the electrode assembly comprises a positive electrode plate, a separator, and a negative electrode plate that are wound together;
• and the positive electrode plate or the negative electrode plate is an electrode plate comprising:
• a current collector, wherein a thickness direction of the current collector is a first direction, a length direction of the current collector is a second direction, and a width direction of the current collector is a third direction;
• a first active material layer, disposed on at least one side of the current collector in the first direction;
• a surface of the first active material layer on a side facing away from the current collector is provided with a plurality of first grooves arranged at equal intervals along the second direction;
• viewed along the first direction, each first groove extends from one side of the first active material layer in the third direction to the other side of the first active material layer in the third direction;
• an extension direction of each first groove is inclined relative to the second direction;
• extension directions of the plurality of first grooves are parallel to each other;
• an angle between the extension direction of the each first groove and the second direction is θ, 0<θ<90°;
• a spacing between two adjacent first grooves in the second direction is W2 mm, θ and W2 satisfy:
• 0.5≤1/(W2×tan θ)≤1.5;
• the electrode assembly comprises a first straight segment, a first bent segment, a second straight segment, and a second bent segment that are connected in sequence;
• the first straight segment and the second straight segment are disposed opposite to each other along a thickness direction of the battery cell;
• and the first bent segment and the second bent segment are disposed opposite to each other along a width direction of the battery cell;
• and
• the electrode plate is provided with the plurality of the first grooves at positions located at the first bent segment and/or the second bent segment.

An electronic device, wherein the electronic device comprises a battery cell, the battery cell comprises an electrode assembly, the electrode assembly comprises a positive electrode plate, a separator, and a negative electrode plate that are wound together;

• and the positive electrode plate or the negative electrode plate is an electrode plate comprising:
• a current collector, wherein a thickness direction of the current collector is a first direction, a length direction of the current collector is a second direction, and a width direction of the current collector is a third direction;
• a first active material layer, disposed on at least one side of the current collector in the first direction;
• a surface of the first active material layer on a side facing away from the current collector is provided with a plurality of first grooves arranged at equal intervals along the second direction;
• viewed along the first direction, each first groove extends from one side of the first active material layer in the third direction to the other side of the first active material layer in the third direction;
• an extension direction of each first groove is inclined relative to the second direction;
• extension directions of the plurality of first grooves are parallel to each other;
• an angle between the extension direction of the each first groove and the second direction is θ, 0<θ<90°;
• a spacing between two adjacent first grooves in the second direction is W2 mm, θ and W2 satisfy:
• 0.5≤1/(W2×tan θ)≤1.5;
• the electrode assembly comprises a first straight segment, a first bent segment, a second straight segment, and a second bent segment that are connected in sequence;
• the first straight segment and the second straight segment are disposed opposite to each other along a thickness direction of the battery cell;
• and the first bent segment and the second bent segment are disposed opposite to each other along a width direction of the battery cell;
• and
• the electrode plate is provided with the plurality of the first grooves at positions located at the first bent segment and/or the second bent segment.