Patent ID: 8603194

Claim:
A method of manufacturing a sealed-type battery that includes a battery case and electrolyte housed in the battery case, the battery case including a battery jar and a sealing member welded to an opening end ,surface of the jar to seal the jar, the method comprising: adhering process to adhere fluorescent material which emits fluorescence in response to ultraviolet light irradiated under condition that alkali metal ions included in the electrolyte exist, to welded portions of the opening end surface of the jar and the sealing member, out of an outer surface of the battery case; and leakage detecting process including irradiating the ultraviolet light to at least a portion adhered with the fluorescent material, out of the outer surface of the battery case, to detect presence/absence of electrolyte leakage based on space size of a portion that belongs to the adhered portion and that emits fluorescent stronger than predetermined fluorescent strength, wherein the electrolyte is an alkali electrolyte and the fluorescent material is chosen from fluorescein, calcein blue, and umbelliferone.