Abstract: An electrode assembly for use in a galvanic cell has electrodes disposed in superimposed pockets of separator material and end surfaces having a uniform appearance. Also provided is a method for producing such an electrode assembly which method is readily adaptable to high speed automated processes of manufacture.

Abstract: A lead acid battery comprises two spaced parallel rows of cells connected in parallel, one plate in each cell lying in the same plane as one plate in every other cell. Every alternate plate in the two electrical end cells is a unipolar plate connected to a terminal pillar while every remaining plate is one half of a bipolar pair of plates connected to its other half in an adjacent cell, preferably in the other line of cells, by an integral bridge piece.

Abstract: The coating of the microporous separators of lead storage batteries with a highly porous glass wool mat on the side facing the negative electrode plates promotes the electrolyte exchange at these plates and also counteracts the tendency toward crumbling and toward the formation of spongy lead (mossing). The glass wool mat may be applied in the form of a plate or a slab to conventionally made separators or it may take the form of a pocket into which the negative electrode plate is inserted.

Abstract: A round battery is provided with a formed separator set to replace the conventional separators, the center insulator of the positive plates, the edge insulators of the positive plates and the edge insulators of the negative plates. A formed separator set including first and second separators is provided, the separators having wall-shaped lip portions extending between first and second separators when the separators are disposed in an assembled electrode assembly and appropriately positioned to extend over and insulate the inner periphery of the positive plates or electrodes, the non-joined portions of the outer periphery of the positive electrodes, and the outer periphery of the negative plate, to separate and insulate unlike plates from each other and to prevent the formation of conductive bridges at the edges of the plates.

Abstract: An electrochemical device comprising at least two cells with electrodes in the form of plates is characterized by the following features:(a) each plate is joined on at least one side to a current outlet which in turn is joined to an electron-conductive extension;(b) the extension abuts at a terminal or, at least in part, constitutes a terminal;(c) the electrical junction between each plate and its outlet is effected substantially over the entire corresponding side of the plate;(d) each outlet and the corresponding extension form an assembly; the distance between the extreme edges of this assembly is substantially equal to the length of the corresponding side of said plate, these extreme edges abutting at said plate;(e) the two cells are connected in electrical series by at least two terminals; the electrical junction between these two terminals is effected substantially over said entire distance between extreme edges in the case of each extension which abuts at one of these terminals or which, at least in par

Abstract: An electric storage battery including plates of one polarity sheathed in envelopes of separator material wherein each envelope includes a pouch for supporting the distal end of an adjacent opposite polarity plate.

Abstract: A separator for an electrochemical cell comprising a container having opposing sides each formed from a layer of solid microporous material and a liquid polymer solution disposed within the container between said layers.

Abstract: A bipolar system comprises a plurality of flexible, conductive electrode strips assembled into a stack with porous, flexible, insulating separator strips being interposed between adjacent electrode strips. Each electrode strip at the exterior of the stack is provided on its innermost surface with electrochemically active material, and the or each electrode strip in the interior of the stack is provided on each of its opposite major surfaces with electrochemically active material. Sealing means is provided around the ends and lowermost edges of the electrode strips.The stack of electrode strips and separator strips is folded into a serpentine configuration and then mounted in a generally rectangular battery box such that the serpentine configuration winds back and forth between opposite walls of the box with electrochemically active material of opposite polarity on an adjacent strip.

Abstract: An electrode structure for a secondary electrochemical cell includes an outer enclosure defining a compartment containing electrochemical active material. The enclosure includes a rigid electrically conductive metal sheet with perforated openings over major side surfaces. The enclosure can be assembled as first and second trays each with a rigid sheet of perforated electrically conductive metal at major side surfaces and normally extending flanges at parametric margins. The trays can be pressed together with moldable active material between the two to form an expandable electrode. A plurality of positive and negative electrodes thus formed are arranged in an alternating array with porous frangible interelectrode separators within the housing of the secondary electrochemical cell.

Abstract: A boron nitride bonded boron nitride fiber article and the method for its manufacture which comprises forming a shaped article with a composition comprising a bonding compound selected from boron oxide and boric acid and a structural fiber selected from the group consisting of boron oxide, boron nitride and partially nitrided boron oxide fibers, heating the composition in an anhydrous gas to a temperature above the melting point of the compound and nitriding the resulting article in ammonia gas.

Abstract: There is disclosed a long life light weight alkaline storage battery taking the form of a two terminal linear array of cells, the sidewalls, tops and bottom portions of which comprise a pair of molded plastic frames of substantially rectangular section which are joined together in a leak proof manner, with each pair similarly joined to either a similar pair, or to an end frame, while the tube of substantially rectangular sections so formed is compartmented by a series of nickel or nickel plated steel end plates that are entered into the joints between frame pairs during assembly, and that, except in the case of outermost cells, have folded dual porous plate type electrodes, impregnated to be of opposite polarity welded to their opposite sides in such manner that they project perpendicularly from the surface of the end plates to which they are attached and possessing tapered leading edges with the foremost edge unimpregnated to facilitate assembly, there being provision so that, in the assembled battery, withi

Abstract: An Electrolytic cell having a separator positioned between a positive electrode and a negative electrode is disclosed in which the separator is a moulding of polymer material derived from a particulate polymer material having a polar graft-copolymerized surface. The separator may be deposited as a coherent film of the surface of an electrode by sintering the particulate material into a coating around the electrode using heat and/or pressure. Alternatively a shaped article such as a case, envelope, sheet film or the like may be prepared and used to wrap around or encase an electrode.

Abstract: A boron nitride bonded boron nitride fiber article and the method for its manufacture which comprises forming a shaped article with a composition comprising boron oxide fibers and boric acid, heating the composition in an anhydrous gas to a temperature above the melting point of the boric acid and nitriding the resulting article in ammonia gas.

Abstract: A novel industrial battery stack is disclosed, wherein positive plates which have been longitudinally wrapped with a perforate or semi-perforate material are accurately aligned with respect to the negative plates and separators in the stack during the stacking operation. The novel spacing members of the present invention have a generally U-shaped cross section for engaging through the wrapping a portion of the positive plate adjacent to the longitudinal edges of that plate. Projections protruding substantially from the base of the "U" provide the proper distance between the edge of the wrapped plate and an adjacent longitudinal surface. During the stacking and burning operation, this longitudinal surface comprises the back wall of a novel industrial battery plate holder.

Abstract: A lead-acid storage cell is operated at a temperature of about 70.degree. C and comprises a positive electrode which, in the charged state, carries an active mass consisting predominantly of lead dioxide, a negative electrode consisting predominantly of lead in the charged condition, and a sulfuric acid electrolyte. To permit the storage cell to operate at the elevated temperature without deterioration, the negative electrode is provided with a sheath permeable to the electrolyte but impermeable to particles released from the negative electrode. The sheath, which may constitute the interelectrode separator, can consist of a nonwoven or woven fabric of glass fiber or a nonwoven or woven fabric of unsubstituted or perhalogenated polyolefin or a layer of ceramic. The electrolyte in the cell is covered by a vaporization-resistant layer consisting of floating solid particles or a liquid which is unaffected by the high operating temperature.

Abstract: There is disclosed an improved tubular battery plate comprising a porous envelope enclosing a current collector comprising an array of members extending perpendicularly from an end member which affords a current take off lug with active material disposed between the perpendicular current collector members and the inside face of the porous envelope the ratio of the length of the tubes in cms to the free cross sectional area in sq. cms being in the range 100.1 to 295.1 and the degree of stratification of the active material in the tubes being less than 5%.

Abstract: A separator for alkaline storage batteries which is a reticular flexible envelope arranged about an electrode, the envelope being formed by interlacing rods. The first group of rods is arranged substantially parallel with respect to the longitudinal axis of the electrode and the second group of rods is arranged with an inclination relative to the first group of rods. A thickness ratio of the first rod group and the second rod group is within the range of about 2 to 4.

Abstract: A secondary storage battery and process involves combining folded positive and negative battery plates and separators to form battery elements, placing the elements within a battery container having partitions defining a plurality of battery cells, joining adjacent battery elements by an intercell connection through the partition walls by welding a positive and a negative terminal through the battery case into contact with positive and negative battery plate lugs respectively.

Abstract: An alkaline cell is described wherein at least a pair of flat electrode elements of opposite polarity having a porous separator containing the alkaline electrolyte interposed therebetween are arranged in the form of a conventional electrode stack assembly, and wherein the electrode assembly is enclosed within a sealed, liquid-impervious plastic film envelope having a positive, negative and a third terminal connection in the walls thereof, each terminal connection comprising flat internal and external current collectors disposed adjacent to the inner and outer sides respectively of the walls overlying openings therein, the collectors being tightly adhered to the respective sides of the walls by thin layers of an adhesive sealant which is non-wettable by the alkaline electrolyte. Means are provided for making electrical connection between the current collectors through the openings in the walls of the envelope.