Abstract: An electricity storage device includes a stack of bipolar electrodes each including a steel sheet, and a plating layer provided on a surface of the steel sheet. The plating layer includes a base nickel-plating layer provided on the surface of the steel sheet, and a surface nickel-plating layer provided on the base nickel-plating layer, and having a surface roughness greater than that of the base nickel-plating layer.

Abstract: A power storage device includes a positive electrode including a positive electrode active material layer formed on a first surface of a positive current collector, a negative electrode including a negative electrode active material layer formed on a first surface of a negative current collector, a separator interposed between the positive electrode active material layer and the negative electrode active material layer, and a sealing portion. One of the positive current collector and the negative current collector is made of aluminum foil having a thickness of 1 to 50 ?m. The other is made of aluminum foil having a thickness of 1 to 50 ?m, or copper foil having a thickness of 1 to 25 ?m. The sealing portion is made of thermoplastic polyolefin-based resin having a peak top temperature of 135° C. or less.

Abstract: An electricity storage device includes a stack of bipolar electrodes each including a steel sheet, and a plating layer provided on a surface of the steel sheet. The plating layer includes a base nickel-plating layer provided on the surface of the steel sheet, and a surface nickel-plating layer provided on the base nickel-plating layer, and having a surface roughness greater than that of the base nickel-plating layer.

Abstract: A search condition acquisition section acquires search conditions associated with a plurality of elements having a hierarchical structure. A search processing execution section executes search processing for identifying, as search results, pieces of search target data associated with respectively corresponding elements in all the tiers that correspond to the elements included in the search condition. An information output section outputs search result information under the condition that the number of pieces of identified search target data is equal to or larger than a predetermined number N. Under the condition that the number of pieces of identified search target data is not equal to or larger than the predetermined number N, the search processing execution section executes the search processing on elements in all the tiers associated with the search condition changed so as to cancel the association with the element in a lowermost tier.

Abstract: Provided is a search system which stabilizes the number of output search results while preventing a response time from increasing. A search condition acquisition section (24) acquires search conditions associated with a plurality of elements having a hierarchical structure. A search processing execution section (30) executes search processing for identifying, as search results, pieces of search target data associated with respectively corresponding elements in all the tiers that correspond to the elements included in the search condition. An information output section (22) outputs search result information under the condition that the number of pieces of identified search target data is equal to or larger than a predetermined number N.