Electrochemical device and electronic device

An electrochemical device includes a negative electrode plate including a negative current collector provided with a negative active material layer and a positive electrode plate including a positive current collector provided with a positive active material layer. The positive active material layer includes a first region. The first region includes a second region and a third region that does not overlap the second region by any area. A first insulation layer is disposed on a surface of the second region. The negative active material layer includes a fourth region facing towards the third region. An area S2 mmof the second region and an area S1 mmof the first region satisfy: S2