STACK, BATTERY, AND BATTERY PACK

According to one embodiment, a stack includes a first active material-containing layer provided in at least a surface of a first current collector and a first film covering at least a part of a surface of the first active material-containing layer including inorganic material particles having a median diameter D50 of 0.6 μm or less and a polymer. The first film has an average pore diameter of 0.5 μm or less, and satisfies formula (1) of 0