Secondary battery and electric device

A secondary battery, comprising:

• a housing, an electrolyte, and an electrode assembly wherein the electrode assembly and the electrolyte are accommodated in the housing;
• the electrode assembly further comprises a positive electrode plate, a separator, a negative electrode plate, and a first-type adhesive tape;
• and the separator is disposed between the positive electrode plate and the negative electrode plate;
• the first-type adhesive tape comprises a substrate layer, a thickness of the substrate layer is H μm and 8≤H≤20, the substrate layer has pores for metal cations to pass through, a porosity of the substrate layer is q and 20%≤≤60%;
• the positive electrode plate comprises:
• a positive electrode current collector;
• a first positive electrode active material layer coated on a first surface of the positive electrode current collector, the first positive electrode active material layer is provided with a first groove, and a portion of the positive electrode current collector is exposed from the first groove;
• a second positive electrode active material layer coated on a second surface of the positive electrode current collector, the second surface of the positive electrode current collector being opposite to the first surface of the positive electrode current collector;
• and
• a positive electrode tab accommodated in the first groove, the positive electrode tab being electrically connected to the positive electrode current collector;
• wherein the first-type adhesive tape comprises a first adhesive tape, and the first adhesive tape is attached to the first positive electrode active material layer and covers the first groove and the positive electrode tab.