SECONDARY BATTERY, BATTERY PACK, AND ELECTRONIC DEVICE

A secondary battery (1), a battery pack (100), and an electronic device (1000) are provided. The secondary battery (1) includes a housing (10, 30); an electrode assembly (20) accommodated in the housing (10, 30), in which the electrode assembly (20) is formed by stacking a first electrode (21), a separator (22), and a second electrode (23); the first electrode (21) includes a first current collector (211), and a partial area of at least one surface of the first current collector (211) is covered with a conductive layer (212) and an insulation layer (213) along a preset direction; the conductive layer (212) is covered with a first active material layer (214), and the first active material layer (214) at least partially covers the insulation layer (213); setting that a thickness of the conductive layer (212) is m, and a thickness of the insulation layer (213) is n, then n≤m.