A negative electrode plate includes a negative current collector and a negative film layer located on a surface of the negative current collector. The negative film layer has a length direction consistent with a length direction of the negative current collector and a width direction consistent with a width direction of the negative current collector. A cross section of the negative film layer perpendicular to the length direction includes a uniform thickness region located at a middle portion in the width direction and edge regions located at two ends in the width direction. Either of the edge regions has a thickness continuously decreasing in a direction from the uniform thickness region to the edge region. A width a of either of the two edge regions and an average thickness d of the uniform thickness region satisfy a/d≤1.5 and d≤300 μm.