NEGATIVE ELECTRODE PLATE, PREPARATION METHOD THEREFOR, SECONDARY BATTERY COMPRISING NEGATIVE ELECTRODE PLATE, AND ELECTRIC DEVICE

The present application provides a negative electrode plate and a method for preparing the negative electrode plate. The negative electrode plate of the present application comprises: 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 comprises 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, and the width a of either of the two edge regions and the average thickness d of the uniform thickness region satisfy the relational expression: a/d ≤ 1.5, and d ≤ 300 µm. Thus, the negative electrode plate free of crimping and cracking and having good mechanical stability can be obtained, and when the negative electrode plate is used for a secondary battery, the phenomenon of local lack of active material and edge lithium precipitation will not occur, thereby facilitating functioning of the high capacity of a negative electrode active material to the maximum extent.