Diaphragm and preparation method thereof, battery and electric device

The invention discloses a diaphragm and a preparation method thereof, a battery and an electric device. The diaphragm comprises a base material and a functional layer arranged on the base material, the functional layer contains an organic compound, and the diaphragm meets at least one of the following characteristics: (a) the average value of foreign matter puncture resistance strength of the diaphragm is N1mN, and N1 is greater than or equal to 500; and (b) the foreign matter puncture resistance strength of the diaphragm meets the following formula: (Nmax-Nmin)/Nmax < = 0.4, Nmax represents the maximum value of the foreign matter puncture resistance strength of the diaphragm, Nmin represents the minimum value of the foreign matter puncture resistance strength of the diaphragm, and the unit is mN. The diaphragm adopted by the invention has relatively good foreign matter puncture resistance, and the safety of the battery can be effectively improved. 本申请公开一种隔膜及其制备方法、电池和用电装置。隔膜包括基材及设置于基材上的功能层，功能层包含有机化合物，隔膜满足如下特征