SECONDARY BATTERY AND METHOD FOR PRODUCING SECONDARY BATTERY

In the present disclosure, local increases in inter-electrode distance in a flat portion in the vicinity of electrode tab groups are suppressed in a secondary battery, in which a wound electrode body is accommodated in a state where electrode tab groups are bent, in a battery case. The secondary battery disclosed herein has a flat-shaped wound electrode body and a battery case that accommodates the wound electrode body. The wound electrode body in such a secondary battery has a positive electrode tab group being a stack of positive electrode tabs, and a negative electrode tab group being a stack of negative electrode tabs, such that the positive electrode tab groups and the negative electrode tab groups are bent. A separator of the secondary battery has a band-shaped base material layer, and a surface layer containing inorganic particles and a binder. At least one from among the positive electrode plate and the negative electrode plate is bonded to the surface layer of the separator. As a result the inter-electrode distance between the positive electrode plate and the negative electrode plate can be properly maintained by the separator, and hence it becomes possible to suppress local increases in inter-electrode distance in the vicinity of the electrode tab groups.