Method of manufacturing battery
A method of manufacturing a battery includes the step of: (A) winding a first separator, a second separator, a positive electrode plate, and a negative electrode plate onto a winding core disposed at a first position; (B) moving the winding core away from the first position and disposing another winding core at the first position; (C) cutting the first separator and the second separator wound on the winding core moved away from the first position, at a groove provided in an outer circumferential surface of the other winding core along the axial direction of the other winding core, with the first separator and the second separator being retained on the outer circumferential surface of the other winding core disposed at the first position; and (D) winding the first separator and the second separator onto the winding core moved away from the first position up to a cut edge portion.
1 . A method of manufacturing a battery including a wound electrode assembly, the method comprising the steps of:
(A) winding a first separator, a second separator, a positive electrode plate, and a negative electrode plate onto a first winding core disposed at a first position;
(B) moving the first winding core away from the first position and disposing another a second winding core at the first position;
(C) cutting the first separator and the second separator wound on the first winding core that is moved away from the first position, wherein the first separator and the second separator and stacked and retained on the outer circumferential surface of the second winding core disposed at the first position in the step (B), wherein the second winding core has a groove provided along an axial direction on its outer peripheral surface, and in step (C) the groove is included in the region where the first separator and the second separator are stacked around the winding core, and cutting the first separator and the second separator on the groove of the outer circumferential surface of the second winding core; and
(D) winding the first separator and the second separator onto the first winding core moved away from the first position in step (B) up to a cut edge portion at which the first separator and the second separator are cut in step (C).
2 . The method according to claim 1 , wherein, in step (C), the first separator and the second separator are cut with the first separator and the second separator being wound on a circumferential region of 15 degrees to 180 degrees of the second winding core.
3 . The method according to claim 1 , wherein, in step (C), the first separator is cut, with the first separator being in contact with the second winding core in an upstream side and a downstream side of a cut position at which the first separator is cut in a transfer path of the first separator.
4 . The method according to claim 1 , wherein, in step (C), the first separator is suction-attached to the second winding core when cutting the first separator and the second separator.
5 . The method according to claim 1 , wherein, in step (C), the first separator and the second separator are pressed against the second winding core by a presser jig when the first separator and the second separator are cut.
6 . The method according claim 5 , wherein the presser jig comprises a roller including a plurality of protrusions formed on an outer circumferential surface of the roller.
7 . The method according to claim 1 , wherein, in step (C), the first separator and the second separator are cut by a blade being movable toward the second winding core.
8 . The method according claim 7 , wherein the blade is a wavy blade.
9 . The method according to claim 1 , wherein the winding core being moved away from the first position in step (B) is disposed at a second position in step (D) and thereafter is moved to a third position being different from the first position and the second position, and the method further includes the step of removing, at the third position, a wound stack in which the first separator, the second separator, the positive electrode plate, and the negative electrode plate are wound together, from the first winding core that is moved away from the first position in step (B).
10 . The method according to claim 1 , wherein, in step (C), the first separator and the second separator are attracted to the outer circumferential surface of the second winding core.
11 . The method of claim 10 , wherein the first separator and the second separator are attracted to the outer circumferential surface of the second winding core using suction.
12 . The method according to claim 1 , wherein, in step (C), the first separator is in direct contact with the outer circumferential surface of the second winding core, and the first separator is between the second separator and the outer circumferential surface of the second winding core.
13 . The method according to claim 12 , wherein, in step (C), the first separator is cut while directly connecting the outer circumferential surface of the second winding core at both an upstream side and a downstream side of the groove.
14 . The method according to claim 1 , further comprising:
winding, after step (C), the positive electrode plate and the negative electrode plate around the second winding core with the first separator or the second separator interposed between the positive electrode plate and the negative electrode plate to produce a wound body; and
removing the wound body from the second winding core.