MANUFACTURING METHOD OF POWER STORAGE MODULE

To improve the non-defective rate of a power storage module.SOLUTION: A manufacturing method of a power storage unit includes an arrangement step S1, a preheating step S4, a welding step S6, and a stacking step S10. In the preheating step S4, a pre-welding resin portion placed in the arrangement step S1 is pressed against the main surface of a current collector with preheating pressure, and the resin temperature which is the temperature of the resin portion is maintained at a softening point or higher and lower than a melting point to preheat the resin portion. In the welding step S6, the preheated resin portion is pressed against the current collector with the welding pressure and the temperature of the resin portion is kept the melting point or higher to weld the resin portion to the main surface to manufacture an electrode unit. In the stacking step S10, the power storage module is manufactured by stacking the electrode units that have undergone the welding step S6. The preheating pressure is less than the welding pressure.SELECTED DRAWING: Figure 5 【課題】蓄電モジュールの良品率を向上する。【解決手段】蓄電ユニットの製造方法は、配置工程Ｓ１と、予熱工程Ｓ４と、溶着工程Ｓ６と、積層工程Ｓ１０と、を含む。予熱工程Ｓ４では、配置工程Ｓ１で配置された溶着前の樹脂部を集電体の主面に予熱圧力で押し付けつつ、当該樹脂部の温度である樹脂温度を軟化点以上かつ融点未満に保つことで、樹脂部の予熱を行う。溶着工程Ｓ６では、予熱が行われた樹脂部を集電体に溶着圧力で押し付けつつ当該樹脂部の温度を融点以上に保つことで主面への当該樹脂部の溶着を行い、電極ユニットを製造する。積層工程Ｓ１０では、溶着工程Ｓ６を経た電極ユニットを積層することで、蓄電モジュールを製造する。予熱圧力は、溶着圧力よりも小さい。【選択図】図５