Abstract: A battery pack disclosed herein includes a plurality of rectangular secondary batteries, a porous elastic member disposed between the rectangular secondary batteries, and a restriction mechanism that applies a restriction load on the rectangular secondary batteries and the porous elastic member. The porous elastic member includes a gas flow channel extending from an outer edge to the inside in a state where the porous elastic member is assembled to the battery pack.

Abstract: Provided is a secondary battery that has a wound electrode assembly that has been precisely wound. A secondary battery is provided with a wound electrode assembly in which a positive electrode plate and a negative electrode plate are wound with a separator interposed therebetween, and is provided with a battery case that houses the wound electrode assembly. The separator has a strip-shaped base material layer and has a surface layer formed on the surface of the base material layer and having a mesh structure formed of polyvinylidene fluoride. The separator is positioned to the outside of a negative electrode trailing end of the negative electrode plate, and the distance between the negative electrode trailing end and a separator trailing end of the separator is not more than 30 mm.