Control valve type lead-acid battery

Abstract

A control valve type lead-acid battery includes: a positive electrode plate, a negative electrode plate, an electrolyte, and a separator between the positive electrode plate and the negative electrode plate. The separator is a non-woven fabric containing glass fiber and an oxygen-containing organic compound. The ratio of the volume (Vp) of the electrolyte impregnated in the positive electrode plate to the total volume (Vt) of the electrolyte (Vp / Vt) is 0.20 or more and 0.30 or less. The LC / MS spectrum of the oxygen-containing organic compound, measured with chloroform as a solvent, has multiple peaks in the region with an m / z value of 400 or more and 2000 or less. The multiple peaks are separated by intervals with m / z values ​​of 20 or more and 25 or 40 or more and 50 or less. All oxygen atoms contained in the oxygen-containing organic compound are contained in at least one of ether bonds and hydroxyl groups. The ratio of the total mass of oxygen atoms contained in the oxygen-containing organic compound to the mass of the oxygen-containing organic compound is less than 0.320.

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