Laminar textile material for a battery electrode

Abstract

The invention relates to a laminar textile material for covering a pasty active mass on a battery electrode. The invention further relates to a battery electrode having such a material, to a battery, and to a method for producing battery electrodes. Potential improvements of lead batteries are disclosed that are more practical than previously known solutions, and that stabilize the pasty active mass on the battery electrodes. A laminar textile materiel is disclosed to this end, comprising glass fibers and fibers made of a thermoplastic plastic, e.g. polyester.

1 . A textile sheetlike material comprising glass fibers and fibers composed of a thermoplastic polymer, wherein the textile sheetlike material is adapted to cover a pasty active mass on a planar, plate-shaped battery electrode which includes a grid of the electrode material, arranged in a frame, wherein at least one of the glass fibers or the fibers composed of a thermoplastic polymer are finely fibrous having a diameter of less than 6 μm. 
     
     
         2 . The textile sheetlike material of  claim 1 , wherein one of the glass fibers and the fibers composed of a thermoplastic polymer are finely fibrous having a diameter of less than 6 μm. 
     
     
         3 . The textile sheetlike material of  claim 1 , wherein the fibers composed of a thermoplastic polymer include polyester fibers. 
     
     
         4 . The textile sheetlike material of  claim 3 , wherein the fibers composed of a thermoplastic polymer have a weight fraction of 5 to 25 percent. 
     
     
         5 . The textile sheetlike material of  claim 4 , wherein a binder is provided to consolidate the fibers. 
     
     
         6 . The textile sheetlike material of  claim 5 , wherein the binder is an acid-resistant acrylate binder. 
     
     
         7 . The textile sheetlike material of  claim 5 , wherein the binder has a weight fraction of 5 to 25 percent. 
     
     
         8 . A planar, plate-shaped battery electrode comprising a planar electrode grid provided in a frame, wherein the electrode grid is coated with a pasty active mass and the active mass is covered with a covering layer of a textile sheetlike material, the covering layer includes glass fibers and fibers composed of a thermoplastic polymer, wherein at least one of the glass fibers or the fibers composed of a thermoplastic polymer are finely fibrous having a diameter of less than 6 um. 
     
     
         9 . The battery electrode of  claim 8 , wherein the electrode is a lead electrode. 
     
     
         10 . The battery electrode of  claim 8 , wherein the electrode is provided in a starter battery for a vehicle. 
     
     
         11 . The battery electrode of  claim 10 , wherein the starter battery for a vehicle includes an electrolyte of liquid sulfuric acid. 
     
     
         12 . The battery electrode of  claim 10 , further comprising a separator is provided between the battery electrode and a neighboring oppositely charged electrode. 
     
     
         13 . The battery electrode of  claim 12 , wherein the separator includes glass fibers. 
     
     
         14 . A process for producing planar, plate-shaped electrodes for batteries comprising the steps of:
 forming an electrode strip with frame and a grid-shaped structure provided in the frame;   coating the surfaces of the electrode strip with a pasty active mass;   applying a covering layer of a material to the pasty mass, wherein the covering layer includes glass fibers and fibers composed of a thermoplastic polymer, and at least one of the glass fibers or the fibers composed of a thermoplastic polymer are finely fibrous having a diameter of less than 6 um;   press molding the covering layer and the pasty mass together with the electrode strip; and   dividing electrodes off the electrode strip.   
     
     
         15 . The textile sheetlike material of  claim 1 , wherein the fibers composed of a thermoplastic polymer have a weight fraction of 5 to 25 percent. 
     
     
         16 . The textile sheetlike material of  claim 1 , wherein a binder is provided to consolidate the glass fibers and fibers composed of a thermoplastic polymer. 
     
     
         17 . The textile sheetlike material of  claim 2 , wherein the fibers composed of a thermoplastic polymer include polyester fibers. 
     
     
         18 . The textile sheetlike material of  claim 17 , wherein the fibers composed of a thermoplastic polymer have a weight fraction of 5 to 25 percent. 
     
     
         19 . The textile sheetlike material of  claim 18 , wherein a binder having a weight fraction of 5 to 25 percent is provided to consolidate the fibers. 
     
     
         20 . The textile sheetlike material of  claim 6 , wherein the binder has a weight fraction of 5 to 25 percent.