Negative pole piece, secondary battery comprising negative pole piece and electric device

The invention discloses a negative pole piece, a secondary battery comprising the negative pole piece and an electric device, and belongs to the technical field of batteries. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer comprises a negative electrode active material, and the negative electrode plate satisfies the following relational expression: 0.15 < = (F * ps)/(rho * 100) < = 10; wherein F is cohesive force of the negative pole piece, and the unit is N/m; ps is the particle size change rate of the negative electrode active material, and the unit is%; rho is the compaction density of the negative pole piece, and the unit is g/cm < 3 >. According to the invention, the negative pole piece is reasonably controlled to meet the relational expression, so that the negative pole piece has a relatively low thickness swelling rate in the circulation process, the gas production condition of the