Lead acid storage battery

Abstract

Provided is a lead acid storage battery wherein the life time performance is significantly improved, reduction of liquid is suppressed, corrosion of the negative electrode ear is suppressed, and the amount of free carbon in the electrolytic solution is small. In the lead acid storage battery, positive and negative electrode grids are comprised of a Pb-Ca-Sn alloy which does not substantially contain Sb, positive and negative electrode straps are comprised of a lead alloy containing 5,000 mass ppm or less of Sb (including cases of substantially 0 mass ppm), and the negative electrode active material is doped with carbon that uses expanded graphite and / or whisker-like carbon in a part thereof. The total additive amount of the expanded graphite and / or the whisker-like carbon is preferably 0.5-3.0 mass% with respect to the mass of the negative electrode active material.

Description

technical field [0001] The invention relates to a lead-acid storage battery, in particular to a lead-acid storage battery with excellent life performance. Background technique [0002] With regard to lead-acid batteries, maintenance-free and non-leakage characteristics have been emphasized in recent years. Since Pb-non-Sb alloys maintain these characteristics and are suitable, Sb-free alloys are widely used as base materials for both positive and negative electrodes. As Sb-free alloys, Pb-Ca-Sn alloys are most widely used. [0003] The so-called Pb-Ca-Sn alloy refers to an alloy composed of Pb, Ca and Sn. In the case of containing other elements, since Ca and Sn have a great influence on the properties of the alloy, including these alloys containing other elements It is called Pb-Ca-Sn alloy. Examples of the fourth element include Al, Ag, Bi, Ba, and the like. [0004] The lead-acid battery using the above-mentioned Sb-free alloy as the base material of the positive elect...

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Problems solved by technology

[0011] In Patent Document 4, according to the structure of the above-mentioned invention, although the following situation is disclosed (paragraph 0018): "Because "the strength of the welded part between the positive electrode and the negative electrode monomer is very strong, the vibration resistance is good, especially because the positive electrode connection part The trace amount of Sb contained is dissolved in the electrolyte and re-precipitated on the surface of the negative electrode, thereby improving the charge acceptance of the negative electrode. The formed positive and negative connection parts greatly reduce the liquid loss, thereby improving the life performance of the lead-acid battery", but the further improvement of the life performance is expected

[0012] In addition, in the invention of Patent Document 4, the carbon added to the negative electrode active material paste is used to obtain charge recovery after deep discharge rather than to improve life performance, and is usually acetylene black, so there is the above-mentioned problem

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