| 摘要 |
1415701 Lead-acid batteries MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 16 Nov 1972 [17 Nov 1971 (2)] 53023/72 Heading H1B A sealed lead-acid battery (Fig. 1, not shown) having a gelled electrolyte and negative electrode active material having a greater discharge capacity than that of the positive electrode active material so that the negative electrode active material is in a partially discharged condition when the positive electrode active material is in a discharged condition, is characterized in that the discharge capacity of the negative electrode active material is in excess of that of the positive electrode active material by 40% or more and a gas phase reaction catalyst for reacting oxygen and hydrogen gas, generated on charging the battery, is situated in a space above the electrolyte, the rate of the reaction of the oxygen and hydrogen at the gas phase reaction catalyst being greater than the rate of oxygen absorption at the negative electrode, and the oxygen absorption rate at the negative electrode being greater than the oxygen generating rate at the positive electrode. The permitted charging rate to satisfy the above conditions depends upon the amount of gas phase reaction catalyst and the ambient temperature as shown in Fig. 2 for the catalyst amounts of 0À5, 1À0, 2À0 and 4À0 gms. This charging rate may be increased by connecting a third, auxiliary electrode, to the negative electrode (Fig. 5, not shown). The third electrode ionizes the oxygen gas and may be moulded from a mixture of PTFE and active carbon containing platinum or palladium. |
