Abstract: The present invention provides a battery includes an exterior body formed of a laminate film, the exterior body 1 having a welded portion 5, a power generating element 4 stored in the exterior body 1, the power generating element 4 being formed by winding electrodes and having an inner and an outer circumferential surface, and a positive and a negative electrode terminal which are connected to the power generating element 4, the terminals being exposed to the outside of the exterior body 1, and in a projected plane with respect to a plane where the welded portion 5 is arranged, the welded portion 5 of the exterior body 1 is arranged in a region between an intermediate point of an inner circumferential end 4c and an outer circumferential end 4d of the power generating element 4, and a side end 2a (3a) of the electrode terminal 2 (3).

Abstract: The non-aqueous electrolyte secondary battery of the invention comprises the following elements. The non-aqueous electrolyte secondary battery comprises a positive electrode comprising a positive active material, a negative electrode comprising a negative active material, and a porous polymer electrolyte interposed therebetween. The positive electrode, the negative electrode and the polymer electrolyte are fixed to each other. In the non-aqueous electrolyte secondary battery, there is no gap between the electrodes and the porous polymer electrolyte layer. In this arrangement, the migration of lithium ion can be conducted extremely smoothly, giving an excellent high rate discharge performance. Further, a high safety can be provided when the battery is overcharged. It is further preferred that the positive electrode and/or negative electrode comprise therein a polymer which constitutes the polymer electrolyte.