NOVELTY - The battery has an electrode assembly that includes a negative electrode arranged to face a positive electrode. The assembly is sealed along with electrolyte liquid in a package container (100). An elevated portion (71) is provided on the container to project toward the assembly. The assembly is housed in a housing container that is sealed by a lid plate (90). A leaking portion guides the refill electrolyte liquid stored in the cavity portion towards the assembly. The elevated portion is formed on the lid plate and the largest of the faces constituting the housing container.    USE - Secondary battery e.g. stacked type lithium ion secondary battery used in solar power generating system, wind power generating system, vehicle such as motorized bicycle, electric railway vehicle and electronic or electric device (all claimed) e.g. laptop personal computer and electrically driven tool. Can also be used in hybrid electric vehicle and electric vehicle, cellular phone, portable electronic appliance, personal digital assistant, digital camera and video camcorder.    ADVANTAGE - The life characteristics of the secondary battery can be improved efficiently. The charge-discharge cycle characteristics can be improved efficiently by feeding the electrolyte liquid stored in the cavity portion towards the electrode assembly through the leaking portion. The electrode assembly can be refilled with electrolyte liquid easily, and thus the life characteristics of the battery can be improved easily. The elevated portion reinforces the large-area portion which tends to be low in mechanical strength. Thus the rigidity of the package container can be improved, and the deformation of the battery can be suppressed. The rigidity of the lid plate can be improved, and the development of strain in the lid plate can be suppressed when the lid plate is welded to the package container. The lid plate can be welded to the package container easily. The secondary batteries can be made larger easily, and thus large-capacity secondary batteries can be obtained easily. The lid member and the package container are fixed together firmly by suppressing stress in the lid plate, and thus the reliability and safety of battery can be improved. The drying out of the electrolyte liquid can be suppressed by feeding the electrolyte liquid stored in the cavity portion towards the electrode assembly, and thus the deterioration in battery performance due to drying out of electrolyte liquid can be suppressed easily. The inconvenience of the electrode assembly damaged due to the leaking portion can be suppressed. The occurrence of internal short-circuiting due to damage to the electrode assembly can be suppressed. The lowering of charge-discharge cycle characteristics and reliability resulting from occurrence of internal short-circuiting can be suppressed. The yield of battery can be improved efficiently by suppressing occurrence of internal short-circuiting. The inconvenience of the cavity portion can be suppressed. Thus the inconvenience of difficulty in restoring the discharge capacity due to the amount of electrolyte liquid stored in the cavity portion can be suppressed. The secondary battery of a stacked type with high rigidity, excellent life characteristics, and high reliability can be achieved efficiently. The large-area electrodes can be housed easily. Thus the large-capacity secondary batteries can be fabricated easily. The flexibility in the choice of the material and the workability during fabrication can be improved. The lifetime of electric power storage equipment can be prolonged and the cost of the wind power generation system can be reduced. The secondary battery can be fabricated easily and the battery can be maintained efficiently for a long period. The secondary battery with a long charge-discharge cycle life can be obtained efficiently.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for fabricating secondary battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the lithium ion secondary battery.    Package can (60)    Flange (67)    Elevated portion (71)    Lid plate (90)    Package container (100)