Abstract: The present invention aims to provide a method for bonding protective tapes to the cut edges of an electrode plate within a short period to prevent short circuit in an electrode assembly. An electrode plate cutting & tape bonding process includes (1) cutting an electrode plate into pieces 100a and 100b, (2) forming a gap W between edges 106 and 107 of the pieces 100a and 100b, (3) bonding protective tapes 51 and 52 to both sides of the pieces 100a and 100b, covering the edges and the gap, and (4) conveying the pieces 100a and 100b connected together. Next, the tapes 51 and 52 are cut into pieces 51a & 52a and 51b & 52b. Then, the electrode plate piece 100a with the tape pieces 51a & 52a and 51b & 52b is wound together with a negative electrode plate, with a separator sandwiched therebetween.

Abstract: The present invention aims to provide a method for bonding protective tapes to the cut edges of an electrode plate within a short period to prevent short circuit in an electrode assembly. An electrode plate cutting & tape bonding process includes (1) cutting an electrode plate into pieces 100a and 100b, (2) forming a gap W between edges 106 and 107 of the pieces 100a and 100b, (3) bonding protective tapes 51 and 52 to both sides of the pieces 100a and 100b, covering the edges and the gap, and (4) conveying the pieces 100a and 100b connected together. Next, the tapes 51 and 52 are cut into pieces 51a & 52a and 51b & 52b. Then, the electrode plate piece 100a with the tape pieces 51a & 52a and 51b & 52b is wound together with a negative electrode plate, with a separator sandwiched therebetween.

Abstract: The present invention aims to provide a method for bonding protective tapes to the cut edges of an electrode plate within a short period to prevent short circuit in an electrode assembly. An electrode plate cutting & tape bonding process includes (1) cutting an electrode plate into pieces 100a and 100b, (2) forming a gap W between edges 106 and 107 of the pieces 100a and 100b, (3) bonding protective tapes 51 and 52 to both sides of the pieces 100a and 100b, covering the edges and the gap, and (4) conveying the pieces 100a and 100b connected together. Next, the tapes 51 and 52 are cut into pieces 51a & 52a and 51b & 52b. Then, the electrode plate piece 100a with the tape pieces 51a & 52a and 51b & 52b is wound together with a negative electrode plate, with a separator sandwiched therebetween.

Abstract: A method includes the steps of: with the use of a winding core having a first member wherein its cross sectional-area in the direction orthogonal to the revolving axis and the peripheral length of the cross section are larger than those of a second member, passing a strip-shaped separator between the first member and the second member, placing one strip-shaped electrode plate near the second member such that the plate is not in contact with the winding core, and winding for one revolution the one electrode plate and the strip-shaped separator toward the first member; placing another strip-shaped electrode plate between the inner and outer portions of the separator that have been revolved along with the one electrode, winding both electrodes along with the separator toward the first member by revolving the winding core; removing the winding core and pressure-molding the resulting wound article into a flat wound electrode assembly.

Abstract: By an easy means the volume energy density of a flat wound electrode assembly in a cell using a flat wound electrode assembly is improved with reliability.