JP2009004218A - Separator winding body for battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a separator winding body for a battery in which a rewinding worker can carry out a pressure-sensitive adhesive tape removing work and a sheet coupling work safely and surely in a short time at the time of switching the winding body when supplied to a battery assembling line in the separator winding body for the battery in which one end of a continuous lengthy sheet of the separator for the battery is fixed, wound around, and retained to a roll core surface by the pressure-sensitive adhesive tape. <P>SOLUTION: In the separator winding body for the battery in which the continuous lengthy sheet of the separator for the battery is wound around and retained to the roll core, the sheet end is stuck and fixed to the roll core surface with a one-sided self-adhesive tape piece having an edge part of which both faces become to have nonadhesive faces. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a separator separator for a battery.

  Conventionally, as shown in FIGS. 1, 2, and 4, the battery separator 1 manufactured as a continuous long sheet is wound around a winding core 2 to form a roll-shaped battery separator wound body 10. When the sheet 1 is wound, one end of the sheet 1 is usually attached to the core 2 with an adhesive tape 3 such as a craft tape or a masking tape (mainly an acrylic or rubber adhesive on a paper base material). It is made to fix with the thing which apply | coated.

  Thus, the separator sheet 1 made into the battery separator winding body 10 is continuously used (continuous line use) in the battery assembly process while being rewound thereafter. The following problems occur when) is reached.

  As described above, the unwinding end of the separator sheet 1 is attached and fixed to the core 2 with the adhesive tape 3, but if the fixing force to the core 2 by the adhesive tape 3 is too strong, the separator sheet 1 is unwound to the end. In addition, the sheet 1 is not smoothly detached from the core 2 due to the feed force, and abnormal tension is applied to the sheet 1 to cause a problem that the sheet near the terminal end is damaged (deformation, breakage, etc.).

  On the other hand, if the adhesive force of the adhesive tape 3 is weakened or the width of the adhesive tape 3 is reduced to weaken the fixing force of the adhesive tape 3 to the core 2, the sheet can be rewound to the end. The sheet 1 can be smoothly detached from the core 2 by a feed force without applying an abnormal tension to the sheet 1, but the adhesive tape 3 is exposed to the separator sheet 1 detached from the core 2 with the adhesive surface exposed. As a result, the adhesive surface exposed portion 3a causes the adhesive tape 3 to stick to the subsequent feed roll, causing problems such as line stoppage.

  On the contrary, when the adhesive surface exposed portion 3a of the attached adhesive tape 3 has a weak adhesive force, as a result, the sticking phenomenon to the feed roll does not occur. There is a problem that the adhesive tape 3 is mixed into the battery at the same time that the separator 1 is assembled into the battery.

  In order to avoid the above problems, the operator usually removes the end of rewinding of the separator sheet 1 by peeling off the adhesive tape 3 from the core 2, and then the adhesive of the adhesive tape 3 is removed. The surface exposed portion 3a (the portion protruding from the separator sheet surface) is cut off along the L1 with a blade such as scissors or a cutter knife.

  Normally, when the separator sheet of the first wound body has been rewound, the separator sheet of the second wound body is continuously supplied to the line when the separator sheet of the first wound body is finished. The unwinding end portion and the unwinding start end portion of the second separator sheet are connected by a joining means such as ultrasonic welding.

  In addition, when connecting both sheets by ultrasonic welding, if the adhesive tape (or the adhesive after the adhesive tape is peeled off) remains in the connection portion, depending on the material of the adhesive tape (for example, craft tape) Since the adhesive force of the remaining part of the adhesive tape (or adhesive) is weak or zero, the connection is insufficient, and there is a possibility of disconnection during the subsequent feed (leading to line stop). When using an adhesive tape that is difficult to obtain a welding effect, such as a kraft tape, as shown in FIG. 2, not only the portion 3a protruding from the surface of the separator sheet 1 but also when the adhesive tape is cut off. The entire adhesive tape 3 remaining on the separator sheet 1 (or the adhesive remaining after peeling) is cut along L2. That.

  In addition, the connection part of the separator sheet supplied to the battery assembly line is usually excluded during the process of cutting the separator sheet into a predetermined dimension.

JP 2003-297326 A

  However, in the case of taking the work method as described above, the worker is looking for the time when the rewinding of the separator sheet of the first wound body is approaching the end while the line is continuously operating, The unwinding end of the first separator sheet is detached from the core, the exposed surface of the adhesive tape is cut off with a blade, and then the unwinding start end of the second separator sheet is pulled out, and the first and second separators are pulled out. It is necessary to smoothly perform a series of operations for joining the end portions of the sheets within a limited time until the feeding of the second separator sheet is started. Therefore, the cutting operation of the adhesive tape using the above-mentioned blade must be performed within a very short time, and the operator often gets burned and injured with the blade. There was a problem of being sent to.

  Therefore, in order to solve this problem, the present applicant, as a method of fixing the separator sheet winding start end to the core, is to insert one end of the separator sheet between the tongue piece provided on the core surface and the core surface. A new fixing method that does not use an adhesive tape for pinching is found and proposed (Patent Document 1). According to the method of Patent Document 1, the separator sheet unwinding termination is a separator because the mechanism for joining the separator sheet surface and the core surface, which was the root of the above-described conventional problems, is not used. The sheet could be removed from the core with little tension applied to the sheet, and the separator sheet surface did not leave any residue at the time of fixing corresponding to the conventional adhesive tape or adhesive, thereby eliminating the conventional problems.

  However, usually, the work of winding the battery separator around the winding core to obtain the battery separator wound body is a work of winding up a wide separator sheet cut into a plurality of rows according to the actual separator width. When the wound separator sheet reaches a predetermined winding length, it is necessary to perform rewinding work with a minimum number of workers within a limited time, and special skills such as Patent Document 1 are required. In rewinding work with fixing methods, if the minimum number of people remains, the rewinding work time will not be in time. However, there was a problem that productivity was lowered.

  Therefore, in view of the above-mentioned conventional problems, the present invention provides a battery separator winding body in which one end of a continuous long sheet of battery separator is fixed and wound on the surface of the core with an adhesive tape. It is an object of the present invention to provide a separator separator for a battery that is capable of safely and reliably performing an adhesive tape removing operation and a sheet connecting operation in a short time when the unwinding operator switches the wound body when supplied. .

  In order to achieve the above object, the battery separator wound body of the present invention is the battery separator wound body in which the continuous long sheet of the battery separator is wound around the core as described in claim 1, The sheet end is bonded and fixed to the surface of the core with a single-sided adhesive tape piece having an edge portion where both surfaces are non-adhesive surfaces.

  Further, the battery separator wound body according to claim 2 is the battery separator wound body according to claim 1, wherein the edge portion is a folded portion toward the adhesive surface side of the single-sided adhesive tape piece. Features.

  The battery separator roll according to claim 3 is the battery separator roll according to claim 1 or 2, wherein the adhesive surface adjacent to the edge of the single-sided adhesive tape piece is on the sheet surface. It is characterized by being stuck and fixed.

  According to the separator separator for a battery of the present invention, the adhesive tape attached to the separator sheet unwinding terminal portion can be safely used without using a conventional blade during continuous unwinding in the battery assembly process. It can be easily removed with bare hands.

  In the separator separator for a battery according to the present invention, the winding start end of the separator sheet is affixed and fixed to the surface of the core with a single-sided adhesive tape piece having edges that are non-adhesive on both sides. The edge of the non-adhesive surface of both surfaces may be, for example, a folded portion to the adhesive surface side of the single-sided adhesive tape piece.

  Further, the fixing force to the core by the single-sided adhesive tape is such that the separator sheet is unwound by a feed force during continuous rewinding in the battery assembling process without applying an abnormal tension or the like to the end of rewinding. It is preferable to select the adhesive strength of the adhesive tape, the width of the adhesive tape, and the fixed length according to the material of the core so that it can be smoothly peeled off. In applying the present invention, the shape of the separator to be rolled up (flat shape, ribbed shape) and the winding direction (rib surface front winding, rib surface back winding) do not limit this effect, and the base material of the adhesive tape The material is not particularly limited.

  The separator separator end for the battery, in which the separator sheet end is fixed to the core by the single-sided adhesive tape having the above characteristics, the separator sheet unwinding end is easily detached from the core by peeling of the adhesive tape, and is attached to the separator sheet. Since the adhesive tape has edges with non-adhesive surfaces on both sides, the edges can be easily grasped with bare hands, and the adhesive tape can be peeled off with a bare hand safely and easily in a short time without using a blade. It can be removed. In particular, if the pressure-sensitive adhesive surface adjacent to the edge of the pressure-sensitive adhesive tape is attached and fixed to the separator sheet surface, the pressure-sensitive adhesive tape can be peeled off more easily and smoothly in a short time.

Next, examples of the present invention will be described in detail together with conventional examples.
(Example)
As shown in FIG. 3, a polyethylene microporous film separator with ribs having a width of 160 mm (ribs) is formed on the surface of a cylindrical core 2 having a width of 170 mm and an outer diameter of 276 mm, which is made of kraft paper having a polyethylene coating surface. One end of the continuous long sheet 1 having a thickness of 1.0 mm for the attached portion and a thickness of 0.25 mm for the rib-free portion is a folded portion 3b (both sides) with one end edge folded back to the adhesive surface side so that the rib surface is on the front side. Using a 30 mm-wide single-sided adhesive masking tape (masking tape No. 720 manufactured by Nitto Denko Corporation) provided with a non-adhesive surface edge), the adhesive surface adjacent to the folded portion 3b is on the surface of the sheet 1 Affixed so that it could be affixed, and wound up until the outer diameter of the wound body reached 850 mm, to obtain a separator separator for a battery.

  Next, the battery assembly was performed while continuously rewinding the obtained battery separator wound body, but the unwinding end (winding start end) of the separator sheet 1 was not subjected to abnormal tension on the sheet 1. The tape was easily detached from the core 2 by peeling off the adhesive tape 3 by the feed force. Moreover, although the adhesive tape 3 was attached to the unwinding termination | terminus of the separator sheet 1, an operator grasps and pulls the said folding | returning part 3b (both edges are non-adhesive surfaces) of the adhesive tape 3, The entire adhesive tape 3 attached to the separator sheet 1 could be removed safely and easily in a short time.

(Conventional example)
As shown in FIGS. 1, 2, and 4, the surface of a cylindrical core 2 having a width of 170 mm and an outer diameter of 276 mm made of kraft paper with a polyethylene coating on the surface is provided with a ribbed polyethylene microporous structure having a width of 160 mm. One end of a continuous long sheet 1 of a film separator (ribbed portion thickness 1.0 mm, ribless portion thickness 0.25 mm) is such that both sides of the folded portion and the like are non-adhesive so that the rib surface is on the front side. A 30 mm wide single-sided adhesive masking tape (masking tape No. 720, manufactured by Nitto Denko Corporation), which is not provided with an edge, is affixed using a piece 3 and wound up until the outer diameter of the wound body reaches 850 mm, and a battery separator A wound body 10 was obtained.

  Next, the battery assembly was performed while continuously rewinding the obtained battery separator wound body 10, but abnormal tension was applied to the sheet 1 at the unwinding end (winding start end) of the separator sheet 1. However, since the adhesive tape 3 has been attached to the end of rewinding of the separator sheet 1, the exposed portion 3 a of the adhesive surface that protrudes from the surface of the separator sheet 1 is removed. Although the operator tried to tear and remove it by pinching with a fingertip of a bare hand, the adhesive force was strong, so it was difficult to stick to the hand and work along the edge L1 in the width direction of the separator sheet 1 The adhesive surface exposed portion 3a protruding from the surface of the separator sheet 1 can not be torn straight, and the cut portion of the adhesive tape 3 becomes oblique and jagged. It was to form the remaining part can not be completely removed by. For this reason, the adhesive tape 3 adhered to the subsequent feed roll, causing a line stop trouble.

(A) Front view of conventional separator separator for battery (b) Side view Explanatory drawing which shows the state which the conventional adhesive tape peeled from the core Explanatory drawing of the separator separator for batteries of one example of the present invention. Explanatory drawing which shows the cutting state of the adhesive tape of the separator separator for conventional batteries

Explanation of symbols

1 Battery separator (sheet)
2 Core 3 Adhesive tape (piece)
3a Adhesive surface exposed part (part protruding from the separator sheet surface)
3b folded portion 10 separator separator for battery

Claims (3)

  In a battery separator wound body in which a continuous long sheet of battery separator is wound and held on a core, the sheet end with respect to the surface of the core has a single-sided adhesive having edges that are non-adhesive on both sides. A separator separator for a battery, wherein the battery separator is fixed with a tape piece.   The battery separator wound body according to claim 1, wherein the edge portion is a folded portion toward the adhesive surface side of the single-sided adhesive tape piece.   The battery separator winding body according to claim 1 or 2, wherein an adhesive surface adjacent to the edge portion of the single-sided adhesive tape piece is bonded and fixed to the sheet surface.

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