A heating apparatus, an image forming apparatus, and a liquid discharge apparatus. The heating apparatus includes a heating roller having a heat source inside, an end holder in which a portion of the heat source is disposed, the end holder holding an axial end of the heating roller rotatably, and an air supply device configured to supply air into the end holder in a direction intersecting with an axial direction of the heating roller. The heating apparatus includes a heating roller having a heat source inside, and an end holder in which a portion of the heat source is disposed, the end holder rotatably holding an axial end of the heating roller. In the heating apparatus, the end holder has an air inlet opening through which air is supplied into the end holder and an air outlet opening through which air is ejected outside from inside the end holder.

A heater includes a plurality of heat-generating cells partitioned by a boundary line arranged on a base body, and includes one resistive heating wire formed in each heat-generating cell and having a zig-zag shape as a whole, the resistive heating wire formed by connecting a parallel wiring and a turn-back wiring formed so as to turn back the parallel wiring in a vicinity of the boundary line between adjacent heat-generating cells. In the adjacent heat-generating cells, the resistive heating wire of a heat-generating cell has an extension portion extending the parallel wiring past the boundary line, and the resistive heating wire of the other heat-generating cell is shortened or deformed so that a wiring of a portion facing the extension portion maintains an electrical insulation with the extension portion. The resistive heating wires of the adjacent heat-generating cells include extension portions alternately in a boundary line direction.

The method of the present disclosure for manufacturing a battery includes roller conveying a heated elongated sheet-like bipolar electrode laminate with a conveying roller. In the method of the present disclosure, the conveying roller has a heating portion at a position overlapping with the gap portion or the opposite side surface thereof, and has a non-heating portion at a position overlapping with the gap portion or a portion other than the opposite side surface thereof, so that the temperature decrease of the gap portion of the bipolar electrode laminate when the bipolar electrode laminate passes through the conveying roller is less than 30 C., and the temperature decrease of the portion other than the gap portion of the bipolar electrode laminate is 30 C. or more.