Secondary battery and preparation method thereof, battery module, battery pack, and electric apparatus

A preparation method of secondary battery, comprising the following:

• (1) preparing a positive electrode plate;
• (2) preparing a negative electrode plate;
• (3) preparing a separator;
• (4) preparing an electrolyte;
• and
• (5) preparing a secondary battery;
• wherein step (2) comprises a step of providing a barrier layer on the negative electrode plate;
• and
• the secondary battery comprises a positive electrode plate and a negative electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and a positive electrode film layer provided on each of two surfaces of the positive electrode current collector, the negative electrode plate comprises a negative electrode current collector and a negative electrode film layer provided on each of two surfaces of the negative electrode current collector, and the negative electrode film layer comprises a reaction zone opposite the positive electrode film layer and a non-reaction zone not opposite the positive electrode film layer, wherein a barrier layer is provided on a surface of the non-reaction zone.