| 摘要 |
Method enabling to fabricate a lead accumulator of which the electrolyte is essentially comprised of sulphuric acid and of a gelifying agent in the form of a thixotropic gel. The electrolyte comprises two different phases, a liquid phase free of gel-forming agents which fills the pores of the active mass and a solid phase in the form of a thixotropic gel which fills the electrolytic space, particularly between the electrodes. In the course of a first step, the pores of the active mass of the electrodes and the pores of the separators attributed to the electrodes are impregnated with sulphuric acid electrolyte free of gel-forming agent, this portion of electrolyte having a concentration of sulphuric acid higher than that which prevails in all of the electrolyte once said concentration has been equalized. During a second step, the spaces which remain still free between the electrodes, including the remaining electrolyte space are filled with a thixotropic gel essentially comprised of sulphuric acid and a gel-forming agent. This second portion of electrolyte formed by the thixotropic gel has a concentration of sulphuric acid lower than that which prevails in all of the electrolyte once said concentration is equalized. Non-woven fabrics, textile fabrics or other flat, porous structures provided with capillarities are attributed to the electrodes as separators and cover completely the electrodes without leaving slits. The electrodes are held in place by spacers. The electrolyte portion which is in the form of thixotropic gel contains as a gel forming agent between 6% and 15%, preferably between 8% and 12% of silicic acid obtained by pyrogenic process and of which the particles have a size comprised between 0.01 and 0.1 micron, preferably between 0.01 and 0.02 micron. |
