Abstract: The present invention relates to a granular material consisting of microporous, substantially hollow granules of lead powder, which is a powdered mixture of lead and lead oxide; a method for the production of this granular material; and the use thereof as an active substance in an electrode plate in a lead accumulator. The present invention provides a granular material lead powder that fulfills the requirements of resistance, size and quality, and which, when being used as an active substance in the lead accumulator, does not deteriorate in its capacity or lifetime. The qualities are achieved by means of the microporous, substantially hollow granules containing 0.5-2.0% by weight of a binder, with a particle diameter of 40-500 m and with the bulk density of 2.4-3.4 g/cm.sup.3.

Abstract: The invention relates to a tubular electrode for an electrochemical accumulator in the shape of an electrode plate with a number of electrolyte-permeable tube casings essentially parallelly arranged adjacent each other, containing an active material and conductors connected to a common collecting bar.

Abstract: A device for sealing the tubes (4) in a tubular electrode plate of an electrochemical lead cell comprising a top and a bottom part. The top part consists of separate sleeves (10) for each tube (4), which optionally are arranged on a connecting strip (14), each sleeve (10) having a bottom with a central through hole with a diameter corresponding to the diameter of the spine (2), which is to protrude therethrough, and a wall, the periphery of which corresponds to the periphery of the tubular casing (4) to butt thereagainst FIG. 2.