Abstract: A lithium ion battery (100) of the invention includes a battery main body (10) which includes one or more power generation elements configured by laminating a positive electrode layer, an electrolyte layer, and a negative electrode layer, in this order; an outer package (20) which includes at least a heat-fusion resin layer (21) and a barrier layer (23), and in which the battery main body (10) is sealed; and a pair of electrode terminals (30), each of which is electrically connected to the battery main body (10) and at least a part of which is exposed to the outside of the outer package (20).

Abstract: A lithium ion battery (100) of the invention includes a battery main body (10) which includes one or more power generation elements configured by laminating a positive electrode layer, an electrolyte layer, and a negative electrode layer, in this order; an outer package (20) which includes at least a heat-fusion resin layer (21) and a barrier layer (23), and in which the battery main body (10) is sealed; and a pair of electrode terminals (30), each of which is electrically connected to the battery main body (10) and at least a part of which is exposed to the outside of the outer package (20).

Abstract: A method of producing a separator (20) of the present invention is a method of producing the separator (20) which includes a resin layer (21), and a ceramic layer (23) provided on one surface of the resin layer (21), the method including a step of cutting the separator into a predetermined size by irradiating the separator with a laser having a wavelength of greater than or equal to 300 nm and less than or equal to 600 nm from a side of the ceramic layer (23). Further, the separator (20) of the present invention includes the resin layer (21), the ceramic layer (23) which is provided on one surface of the resin layer (21), and a curled portion (27) which is formed by curling at least one end portion (25) of the separator (20) toward a surface on a side of the resin layer (21).