Abstract: A bipolar battery includes a plurality of cell members, each including a positive electrode having a positive active material layer, a negative electrode having a negative active material layer, and an electrolyte layer interposed between the positive electrode and the negative electrode. The bipolar battery also includes a plurality of frame units respectively forming a plurality of cells respectively incorporating the plurality of cell members. Each of the plurality of frame units is a frame unit made of a light transmissive resin material. Two of the frame units made of the light transmissive resin material adjacent in a stacking direction of the cell members are welded and joined at a welded portion via a joining member made of a light absorbing resin material. This configuration can provide a bipolar battery capable of reliably preventing electrolytic solution leakage out of a cell by means of a simple seal structure.

Abstract: A bipolar battery includes a plurality of cell members and a plurality of frame units respectively forming a plurality of cells respectively incorporating the plurality of cell members. The plurality of frame units includes frame units made of a light transmissive resin material and frame units made of a light absorbing resin material that are alternately arranged in a stacking direction of the cell members. The frame units made of a light transmissive resin material and the frame units made of a light absorbing resin material adjacent in the stacking direction of the cell members are joined at welded portions. This configuration can provide a bipolar battery capable of reliably preventing electrolytic solution leakage out of a cell by means of a simple seal structure.

Abstract: To provide an illumination device that has a simple configuration and can be assembled easily, and can reduce production cost. An illumination device includes a light source, a reflective layer disposed to reflect light from the light source and to direct the light out of the illumination device to provide illumination, a base layer made of thermoformed resin provided at the reflective layer to hold the light source, and conductors disposed on the base layer and connected to the light source to supply power to the light source.

Abstract: To provide an illumination device that has a simple configuration and can be assembled easily, and can reduce production cost. An illumination device includes a light source, a reflective layer disposed to reflect light from the light source and to direct the light out of the illumination device to provide illumination, a base layer made of thermoformed resin provided at the reflective layer to hold the light source, and conductors disposed on the base layer and connected to the light source to supply power to the light source.