Patent ID: 7820326
Filing Date: 2010-10-26
Classification: H01M,Y02E,Y02P

Abstract:
1. An alkaline battery in which a positive electrode and a negative electrode are housed in a battery case with a separator interposed therebetween, wherein the battery case has an opening portion sealed with a sealing plate using a gasket, the positive electrode contains electrolytic manganese dioxide at a potential in the range from 275 mV to 320 mV with respect to a reference electrode of mercurous oxide (Hg/HgO), the negative electrode contains zinc, a closed space is formed between the gasket and the positive and negative electrodes in the battery case and has a volume in the range from 2.0% to 6.0% of a volume inside the battery formed by the battery case and the sealing plate, and a ratio of a height of the negative electrode to a height of the positive electrode is in the range from 1.00 to 1.08.