NOVELTY - The tubular apparatus comprises a first tube-shaped closed element (1) made of an insulating material, in the interior of which an electrode is accommodated, a second tube-shaped element (3), which is made of an insulating material and surrounds the first tube-shaped element such that a closed hollow space (4) exists between the first and second tube-shaped elements, and a textile element (5), which extends around the circumference of the first tube-shaped element and is inserted into the hollow space. The electrode comprises a liquid or powdered electron conductor.    USE - Tubular apparatus useful during the conversion of chemical into electric energy in batteries or fuel cells.    ADVANTAGE - The tubular apparatus can be easily and cost-effectively manufactured with high efficiency, and guarantees the protection function against mechanical damage.    DETAILED DESCRIPTION - The tubular apparatus comprises a first tube-shaped closed element (1) made of an insulating material, in the interior of which an electrode is accommodated, a second tube-shaped element (3), which is made of an insulating material and surrounds the first tube-shaped element such that a closed hollow space (4) exists between the first and second tube-shaped elements, and a textile element (5), which extends around the circumference of the first tube-shaped element and is inserted into the hollow space. The electrode comprises a liquid or powdered electron conductor, which fills the interior of the first tube-shaped element. The inner diameter (Di) of the second tube-shaped element is smaller than the outer diameter (D(A1)) of the unit consisting of the first tube-shaped element and the textile element in the relaxed state of the textile element. The outer diameter (D(A2)) of the second tube-shaped element is less than 10 mm. The electrode comprises an elongated element (2), whose longitudinal axis extends parallel to the longitudinal axis of the tube-shaped elements, where the elongated element has flexible lamellae or bristles extending radially to its longitudinal axis. The flexible lamellae or bristles are connected by pressure with the first tube-shaped element. The bristles are produced from hollow fibers, which have an outer diameter of 9-140 mu m. The textile element is fabric, knitted fabric, felt, fleece or tissue from hollow fibers. The hollow fibers of the textile element have an outer diameter of 9-140 mu m. The hollow fibers contain an electrolyte in solid or liquid form. A third tube-shaped element is made of insulating material or an electrical conductor, surrounds the second tube-shaped element, so that a further hollow space exists between the second and third tube-shaped elements, where a further textile element extends around the circumference of the second tube-shaped element and is inserted into the further hollow space. The inner diameter of the third tube-shaped element is smaller than the outer diameter of the unit consisting of the second tube-shaped element and the textile element in the relaxed state of the textile element. A closable opening is formed at a longitudinal-side end of the interior of the first tube-shaped closed element and allows the replacement or regeneration of electrode. A further closable opening is formed at a longitudinal-side end of the hollow space between the first tube-shaped closed element and second tube-shaped element and allows the replacement or regeneration of electrolyte.    DESCRIPTION OF DRAWING(S) - The diagram shows a cross-sectional view of a tubular device.    First tube-shaped closed element (1)    Elongated element (2)    Second tube-shaped element (3)    Closed hollow space (4)    Textile element. (5)