Secondary battery and electric apparatus

A secondary battery, comprising a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte;

• wherein the positive electrode sheet comprises a positive electrode active material layer, the negative electrode sheet comprises a negative electrode active material layer;
• a coating weight of the positive electrode active material layer is Wz, a coating weight of the negative electrode active material layer is Wf, and Wz and Wf satisfy:
• 1.6Wf≤Wz≤2.2Wf, and 3.25 mg/cm2≤Wf≤5.84 mg/cm2;
• the separator comprises a separator substrate, a first adhesive coating, and a second adhesive coating;
• wherein the first adhesive coating and the second adhesive coating are respectively provided on two sides of the separator substrate;
• the first adhesive coating comprises a first polymer binder, and an average particle size of the first polymer binder is 0.3 μm to 3 μm;
• and the second adhesive coating comprises a second polymer binder, and an average particle size of the second polymer binder is 10 μm to 38 μm;
• the electrolyte comprises an organic solvent, a lithium salt, and an additive;
• wherein the organic solvent comprises chain carboxylate;
• and based on a mass of the electrolyte, a mass percentage of the chain carboxylate is 6% to 56%.