Positive electrode plate for sealed lead-acid battery and sealed lead-acid battery using the positive electrode plate

摘要

PPROBLEM TO BE SOLVED: To provide a cathode plate for a sealed lead-acid battery, in which softening and falling-off of an active material and corrosion of a cathode grid which causes lifetime end of the cathode in use for a cycle-use usage, and the sealed lead-acid battery which is superior in the initial capacity and cycle lifetime performance that uses the cathode plate. PSOLUTION: In the cathode plate, in which an active material paste is filled in the cathode grid made of Pb-Ca based alloy, this is the cathode plate for the sealed lead-acid battery, in which the Pb-Ca based alloy contains Ca of not lower than 0.02% (wt%, the same in the following) and lower than 0.05%, Sn of not lower than 0.4% and not higher than 4.0%, Al of not higher than 0.04%, and Ba of not lower than 0.002% and not higher than 0.014%, and the rest part is composed of Pb and inevitable impurities, and Bi of 0.01 to 0.10% is contained in the active material paste, of which the density is 4.4 to 4.9 g/cc. This sealed lead-acid battery has an electrode plate group, including the cathode plate, housed at a group pressure of 40 to 100 kPa inside the battery case. PCOPYRIGHT: (C)2006,JPO&NCIPI