JP2016157514A - Removal device for abnormal portion in separator material, and removal method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a removal device for an abnormal portion in a separator sheet capable of preventing the separator sheet from being wasted by sticking with the separator sheet having the abnormal portion even if there is the abnormal portion in the separator sheet before bonding, and a removal method therefor.SOLUTION: The removal device comprises: an operation roller 24 by which, after an abnormal portion in a separator sheet S1 is detected, the separator sheet S1 is drawn in a direction that is different from a direction of conveyance and a turning part T including the abnormal portion is formed; a coupling and removal unit 25 for forming a coupling part C in which the separator sheet S1 is overlapped and coupled in the turning part T; and control means 20 which controls the operation roller 24 and the coupling and removal unit 25, based on a detection signal of the abnormal portion from detection means. The turning part T has a removal target part T1 in which the abnormal portion is included and the coupling part C is not included, and the coupling and removal unit 25 cuts the removal target part T1 from the separator sheet S1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an apparatus for removing an abnormal portion in a separator material during battery manufacture and a method for removing the same.

  For example, an electrode stacking device disclosed in Patent Document 1 is known as a conventional technique for removing an abnormal site in a separator material and a method for removing the abnormal site. The electrode laminating apparatus disclosed in Patent Document 1 includes a first separator roll that continuously feeds the first separator sheet from one side in the horizontal direction, and a second separator sheet that is continuously fed from the other side in the horizontal direction. And a second separator roll that is fed out. Furthermore, a roll pair is provided that continuously bonds the fed first and second separator sheets. The electrode stacking apparatus is in a posture along the vertical direction from vertically upward toward the valley of the first and second separator sheets formed above the facing position (bonding position) where the circumferential surface of the roll is closest. An electrode supply device that sequentially supplies electrodes is provided. The electrode supply device includes an electrode roll that feeds out the electrode sheet, a cutter device that cuts out the electrode from the electrode sheet that is fed out from the electrode roll, and an electrode that supplies the cut-out electrode toward the valleys of the first and second separator sheets. A pair of supply rolls.

  The pair of rolls for successively bonding the first and second separator sheets is a welding apparatus for welding the first and second separator sheets at the bonding position before at least the lower part of the electrode reaches the bonding position. Have By providing a welding device in this roll pair, continuous welding of the first and second separator sheets becomes possible. Two inspection cameras and a conveyor device are provided on the downstream side of the roll pair. One inspection camera is configured to image the first separator sheet and transmit data acquired by the imaging to the control device. The other inspection camera is configured to image the second separator sheet and transmit data acquired by the imaging to the control device. In a control device (not shown), the imaged data is subjected to image processing, and the presence or absence of abnormal states (such as wrinkles, wrinkles, and defects (pinholes and tears)) of the first separator sheet and the second separator sheet is inspected.

JP 2012-199210 A

  However, in the electrode stacking apparatus disclosed in Patent Document 1, the inspection camera inspects the first and second separator sheets that are wrapped and bonded together. For this reason, for example, when an abnormality occurs only in the first separator sheet and the second separator sheet or electrode is normal, there is a problem in that the normal second separator sheet or electrode is wasted. By the way, it is considered that inspection cameras are provided between the first separator roll and the roll pair or between the second separator roll and the roll pair, respectively, and the first and second separator sheets are inspected for abnormality. It is done. For example, when an abnormality occurs only in the first separator sheet, the supply of the electrodes may be stopped and the first and second separator sheets that have passed through the roll pair may be removed. However, since the second separator sheet in which no abnormality has occurred and the first separator sheet in which abnormality has occurred are removed after being bonded together, the second separator sheet in which abnormality has not occurred is wasted.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to eliminate waste of the separator sheet due to pasting with the abnormal part separator sheet even if there is an abnormal part in the separator sheet before pasting. An object of the present invention is to provide an apparatus and a method for removing an abnormal site in a separator sheet that can be prevented.

  In order to solve the above-described problems, the present invention provides a detecting unit that detects an abnormal part of a separator sheet that is continuously conveyed, and a removing unit that removes the abnormal part detected by the detecting unit from the separator sheet. In the apparatus for removing an abnormal part in a separator sheet, comprising: after the detection of the abnormal part, pulling back the separator sheet in a direction different from the conveying direction and folding it back, so that a folded part including the abnormal part is formed on the separator sheet. A separator operating means to be formed; a connecting means for connecting the separator sheets in an overlapping manner in the folded portion; a connecting means for forming the connecting portion in the width direction of the separator sheet; Control means for controlling the connecting means and the removing means, and the folding , The abnormal region is included, and has the connecting portion is not included removal target part, said removal means is characterized by excising the removal target part from the separator sheet.

  According to the present invention, when an abnormal part is detected, a separator sheet including the abnormal part is pulled out in a direction different from the conveying direction by the separator operating means to form a folded part. A connecting portion that overlaps and connects the separator sheet to the folded portion including the abnormal part is formed by the connecting means. The folded portion includes a removal target portion that includes an abnormal portion and does not include a connecting portion. The removal target portion including the abnormal part is removed by the removing means, but the connecting portion remains on the separator sheet and is conveyed as a part of the separator sheet. As a result, even if an abnormal site exists in the separator sheet, for example, only the abnormal site can be removed before being bonded to another separator sheet.

The apparatus for removing an abnormal part in the separator sheet includes a moving body that is movable in the conveying direction at the same speed as the separator sheet conveying speed, and the moving body includes the separator operating means, the connecting means, It is good also as a structure provided with the said removal means.
In this case, the moving body moves in the conveying direction at the same speed as the separator sheet conveying speed, so that the separator operating means, the connecting means, and the removing means move in the conveying direction at the same speed as the separator sheet conveying speed. To do. As a result, the abnormal part can be removed without stopping the conveyance of the separator sheet.

Further, in the above-described apparatus for removing abnormal parts in the separator sheet, a pair that joins a pair of the separator sheets that are conveyed from different directions and forms a joint that overlaps and joins the pair of separator sheets at a predetermined interval. And an electrode supply means for supplying an electrode between the pair of separator sheets, and the control means moves the connection means to the pair so that the connection part is located at the joint. It is good also as a structure controlled in synchronization with the joining roll.
In this case, the electrodes are wrapped by the pair of separator sheets in the joining roll, the joining portion is formed in the pair of separator sheets, and the pair of separator sheets are bonded together. The control means controls the connecting means in synchronization with the pair of joining rolls so that the connecting part is located at the joining part. For this reason, the connection part formed in the separator sheet which removed the abnormal site | part is joined by a pair of joining roll, and forms a junction part. Therefore, the connecting portion does not contact the electrode.

In the apparatus for removing an abnormal part in the separator sheet, the control unit may perform a control to stop the conveyance of the separator sheet when the abnormal part is detected by the detection unit.
In this case, when removing the abnormal portion, the separator operating means, the connecting means, and the removing means do not need to move in the transport direction at the same speed as the separator sheet transport speed. As a result, the configuration of the apparatus is simplified as compared with the case where the separator operating means, the connecting means, and the removing means are moved in the transport direction at the same speed as the separator sheet transport speed.

The present invention also provides a method for removing an abnormal part in a separator sheet that detects an abnormal part of a separator sheet that is continuously conveyed and removes the abnormal part, and includes a separator including the abnormal part after the detection of the abnormal part. The sheet is formed in a folded portion that is pulled out and folded in a direction different from the conveyance direction, and a connecting portion that overlaps and connects the separator sheet to the folded portion is formed in the width direction of the separator sheet. The removal target part includes the abnormal part, and the removal target part is excised from the separator sheet.
According to the present invention, even if an abnormal site exists in the separator sheet, for example, only the abnormal site can be removed before being bonded to another separator sheet.

  ADVANTAGE OF THE INVENTION According to this invention, even if there exists an abnormal part in the separator sheet before bonding, the removal apparatus of the abnormal part in a separator sheet which can prevent the waste of a separator sheet by bonding with the separator sheet of an abnormal part, and its removal A method can be provided.

1 is a schematic configuration diagram of an electrode laminate manufacturing apparatus according to a first embodiment of the present invention. (A) is a schematic block diagram of the moving body of an electrode laminated body manufacturing apparatus, (b) is a perspective view explaining operation | movement of an operation roller. It is explanatory drawing which detected the abnormal site | part of the separator sheet in the electrode laminated body manufacturing apparatus. It is explanatory drawing which shows the state before drawing an abnormal site | part in an electrode laminated body manufacturing apparatus. It is explanatory drawing which shows the state in which the folding | turning part containing an abnormal site | part was formed in the electrode laminated body manufacturing apparatus. In an electrode laminated body manufacturing apparatus, it is explanatory drawing which shows a state just before a connection part is formed in a folding | turning part and the removal object part containing an abnormal site | part is removed. It is the schematic explaining the setting distance in an electrode laminated body manufacturing apparatus. In an electrode laminated body manufacturing apparatus, it is explanatory drawing which shows a state which a mobile body returns to an original position after the removal object part is removed. It is a schematic block diagram of the electrode laminated body manufacturing apparatus which concerns on the 2nd Embodiment of this invention. It is a schematic block diagram which shows the principal part of the electrode laminated body manufacturing apparatus which concerns on another example.

(First embodiment)
Hereinafter, an electrode laminate manufacturing apparatus according to a first embodiment of the present invention will be described with reference to the drawings. The electrode laminated body manufacturing apparatus of this embodiment is an apparatus which manufactures the electrode laminated body with which a battery is equipped. The electrode laminate is formed by wrapping an electrode (positive electrode or negative electrode) in a bag shape with a separator sheet. The electrode laminated body manufacturing apparatus of this embodiment is corresponded to the removal apparatus which removes the abnormal site | part in the separator sheet of this invention.

  As shown in FIG. 1, the electrode laminate manufacturing apparatus 10 includes a first separator roll 11 that continuously sends out the first separator sheet S1 from one side to the other side in a horizontal manner. Moreover, the electrode laminated body manufacturing apparatus 10 is provided with the 2nd separator roll 12 which sends out 2nd separator sheet S2 horizontally continuously toward one side from the other. The first separator roll 11 includes a first roll shaft 13, and the first separator sheet S <b> 1 is wound around the first roll shaft 13. The axial direction of the first roll shaft 13 is a horizontal direction and a direction orthogonal to the feeding direction of the first separator sheet S1. The first separator sheet S1 is a porous resin material having thermoplasticity and insulation, and functions as a separator in the battery.

  The second separator roll 12 includes a second roll shaft 14, and the second separator sheet S <b> 2 is wound around the second roll shaft 14. The axial direction of the second roll shaft 14 is a horizontal direction and a direction orthogonal to the feeding direction of the second separator sheet S2. The second separator sheet S2 is the same material and the same size as the first separator sheet S1. The feeding direction of the second separator sheet S2 is a horizontal direction and is opposite to the feeding direction of the first separator sheet S1. The first separator sheet S1 and the second separator sheet S2 are sent out so as to approach each other.

  A pair of welding rolls 15 and 16 having parallel rotation axes are arranged at the delivery destination of the first separator sheet S1 and the second separator sheet S2. The pair of welding rolls 15 and 16 correspond to a pair of joining rolls. The direction of the rotation axis of the pair of welding rolls 15 and 16 is a horizontal direction and a direction orthogonal to the feeding direction of the first separator sheet S1 and the second separator sheet S2. The peripheral surfaces of the pair of welding rolls 15 and 16 approach each other and face each other. The pair of welding rolls 15 and 16 join the first separator sheet S1 and the second separator sheet S2 by welding in a state where the electrode P is sandwiched between the first separator sheet S1 and the second separator sheet S2. The pair of welding rolls 15 and 16 are rotated relative to each other so that the first separator sheet S1 and the second separator sheet S2 are merged and directed downward in the vertical direction from the horizontal direction.

  A welding machine 17 is provided on the outer periphery of the pair of welding rolls 15 and 16. The welding machine 17 is provided on the welding rolls 15 and 16 so that the circumferential surfaces of the welding rolls 15 and 16 are opposed to each other at the closest position. The welding machine 17 of the welding rolls 15 and 16 joins the first separator sheet S1 and the second separator sheet S2 by thermal welding when facing each other. In this embodiment, each welding roll 15 and 16 is provided with two welding machines 17 with a phase of 180 °. Although not shown, the welding machine 17 is provided with a weldable portion that can join the first separator sheet S1 and the second separator sheet S2 in the circumferential direction at both ends of the joint portion G. For this reason, the electrode P is wrapped in the bag-shaped first separator sheet S1 and the second separator sheet S2. When the pair of welding rolls 15 and 16 make one rotation, the first separator sheet S1 and the second separator sheet S2 are joined by welding twice, and when the pair of welding rolls 15 and 16 continues to rotate, a predetermined interval is reached. To form the joint G. Each of the pair of welding rolls 15 and 16 is provided with a rotation angle sensor (not shown) for detecting a rotation angle. The timing at which the welding machine 17 of each of the welding rolls 15 and 16 approaches again is set to a rotation angle of 0 ° (or 180 °).

  An electrode supply device 18 is installed above the pair of welding rolls 15 and 16. The electrode supply device 18 supplies the electrode (positive electrode) P toward the pair of welding rolls 15 and 16. The electrode supply device 18 is provided with a pair of supply rolls 19. The pair of supply rolls 19 pass the electrode P between the supply rolls 19 and supply the welding rolls 15 and 16 below the electrode supply device 18 in the vertical direction. The electrode P supplied to the welding rolls 15 and 16 is manufactured to a predetermined size in advance, and an active material (positive electrode active material) (not shown) is applied to the front and back surfaces of the electrode P. The electrode supply device 18 is electrically connected to the control means 20 and is controlled by the control means 20 so as to supply the electrode P in accordance with the rotation of the pair of welding rolls 15 and 16. The electrode P supplied from the electrode supply device 18 to the welding rolls 15 and 16 is encased in the pair of welding rolls 15 and 16 by the first separator sheet S1 and the second separator sheet S2. The electrode P, the first separator sheet S1, and the second separator sheet S2 form an electrode laminate A. The electrode laminate A is formed with a joining portion G where the first separator sheet S1 and the second separator sheet S2 are joined by the welding machine 17. The control means 20 and the rotation angle sensor are connected, and the rotation angle of the pair of welding rolls 15 and 16 is always detected by the rotation angle sensor, and the signal of the rotation angle sensor is transmitted to the control means 20. .

  The electrode laminate manufacturing apparatus 10 of the present embodiment includes a camera 21 as detection means for detecting an abnormality of the first separator sheet S1. The camera 21 is provided in the vicinity of the first separator roll 11 and above the first separator sheet S1, and continuously photographs the surface of the first separator sheet S1 fed from the first separator roll 11 to the welding roll 15. To do. The camera 21 is electrically connected to the control unit 20, and image data of the camera 21 is transmitted to the control unit 20. The imaging data is analyzed by the control means 20, and the control means 20 determines the presence / absence of foreign parts such as metal powder, abnormal parts such as wrinkles and pinholes from the analysis of the imaging data. Moreover, the electrode laminated body manufacturing apparatus 10 has a camera 22 as detection means for detecting an abnormality of the second separator sheet S2 fed from the second separator roll 12 to the welding roll 16. The camera 22 that images the second separator sheet S2 is the same camera as the camera 21 that images the first separator sheet S1, and is electrically connected to the control means 20.

  In the present embodiment, a moving body 23 that can reciprocate horizontally in the pull-out direction of the first separator sheet S1 is provided between the camera 21 that images the first separator sheet S1 and the welding roll 15. The moving body 23 is movable in the pulling direction at the same speed as the pulling speed of the first separator sheet S1. A driving source (illustrated) for reciprocating movement of the moving body 23 is controlled based on a command from the control means 20. As shown in FIG. 2A, the moving body 23 is provided with an operation roller 24 as a separator operation means, and a connection / removal unit 25 including a connection means and a removal means.

  The operation roller 24 is used to draw out the abnormal part of the first separator sheet S1 in a direction different from the conveying direction after the detection of the abnormal part of the first separator sheet S1, and form a folded portion T including the abnormal part by pulling out. It is. As shown in FIG. 2A, the operation roller 24 includes a shaft portion 26 and a roller portion 27 that is rotatable with respect to the shaft portion 26. The axial direction of the operation roller 24 is a horizontal direction that is orthogonal to the conveying direction of the first separator sheet S1. As shown in FIG. 2B, the operation roller 24 can be moved up and down by an elevating means (not shown), and advanced and retracted in a direction perpendicular to the conveying direction of the first separator sheet S1 by an advancing / retreating means (not shown). Is possible. The raising / lowering means and the advance / retreat means of the operation roller 24 are controlled by the control means 20. The operating roller 24 is positioned above the first separator sheet S1 when there is no abnormality in the first separator sheet S1. When an abnormality occurs in the first separator sheet S1, the operation roller 24 is lowered, but after the abnormal portion is removed, the operation roller 24 moves backward from the first separator sheet S1, and after the retraction, the conveying surface of the first separator sheet S1. Rise to be higher than. After rising, it moves forward so as to be positioned above the first separator sheet S1. In addition, the folding | turning part T has the removal object part T1 as an abnormal site | part removed by the connection removal unit 25 demonstrated below, and the residual object part T2 conveyed to the welding roll 15 without being removed. That is, the folded portion T has a removal target portion T1 that includes an abnormal part and does not include the connecting portion C.

  The connection removal unit 25 is provided at a position facing the back surface of the first separator sheet S <b> 1 conveyed by the moving body 23. In addition to the function of cutting and removing the removal target part T1 from the folded part T including the abnormal part when the abnormal part occurs in the first separator sheet S1, the connection removal unit 25 removes the remaining target part T2 of two layers. It has a function to connect by welding. The connection removal unit 25 has a pair of unit portions 29 and 30 that are arranged to face each other with a predetermined interval. The pair of unit parts 29 and 30 can be reciprocated in the same direction as the moving body 23 with respect to the moving body 23 by a driving source (not shown), and approach and separate from each other by moving forward and backward. The predetermined interval between the pair of unit portions 29 and 30 is set to allow the passage of the operation roller 24. The drive source that moves the unit units 29 and 30 is controlled based on a command from the control means 20.

  A guide roller 31 that can come into contact with the back surface of the first separator sheet S <b> 1 is provided on the upper portion of the unit portion 29. In the upper part of the unit part 30, a guide roller 32 that can come into contact with the back surface of the first separator sheet S 1 is provided in the same manner as the unit part 29. The guide rollers 31 and 32 can roll freely. A heating unit 34 is formed on the opposing surface of the unit unit 29 that faces the unit unit 30. The heating unit 34 is heated to a temperature at which the first separator sheet S1 is melted. A pressing portion 35 that faces the heating portion 34 is formed on the facing surface that faces the unit portion 29 in the unit portion 30. The heating part 34 and the crimping part 35 correspond to a connecting means. When the heating part 34 and the crimping part 35 are heated while sandwiching the folded part T, a connecting part C is formed in which the first separator sheet S1 is overlapped and connected by welding in the width direction of the folded part T. Heating control of the heating unit 34 is performed by the control means 20.

  A cutting blade 36 is provided on the surface of the unit portion 29 that faces the unit portion 30. The cutting blade 36 can protrude and retract from an opposing surface facing the unit portion 30. A blade receiving portion 37 facing the cutting blade 36 is formed on the facing surface facing the unit portion 29 in the unit portion 30. The cutting blade 36 abuts against the blade receiving portion 37 and cuts the folded portion T by protruding from the facing surface when the unit portions 29 and 30 are closest to each other when the folded portion T is formed. The cutting blade 36 and the blade receiving portion 37 correspond to a removing unit. The cutting blade 36 and the blade receiving portion 37 cut the removal target portion T1 of the folded portion T from the first separator sheet S1. In addition, the appearance of the cutting blade 36 is controlled by the control means 20.

  The connection removal unit 25 forms the connection portion C with respect to the folded portion T formed by the operation roller 24, and cuts and removes the removal target portion T1 including the abnormal part from the first separator sheet S1. In the present embodiment, the control means 20 includes the connection removal unit 25 so that the connection portion C that is a seam in the first separator sheet S1 is always included in the joining portion G formed by the welding machine 17 of the welding rolls 15 and 16. Control. Although control for the connection part C to be included in the joint part G will be described later, the length from the position where the first separator sheet S1 forms the joint part G in contact with the welding machine 17 to the position of the connection part C, Basically, it may be an integral multiple of the length of the outer circumference of the welding roll 15. The control means 20 controls the connection removal unit 25 in synchronization with the welding rolls 15 and 16 so that the connection part C is located at the joint part G.

  In the present embodiment, a moving body 23 is provided between the camera 22 that images the second separator sheet S2 and the welding roll 16 so as to reciprocate horizontally in the pull-out direction of the second separator sheet S2. Since the moving body 23 has the same configuration as the moving body 23 provided between the camera 21 that images the first separator sheet S <b> 1 and the welding roll 15, the description is omitted here.

  Next, the operation of the electrode laminate manufacturing apparatus 10 of this embodiment will be described. The first separator sheet S1 is drawn out and conveyed from the first separator roll 11 toward the welding roll 15, and the second separator sheet S2 is drawn out and conveyed toward the welding roll 16. When the first separator sheet S1 and the second separator sheet S2 reach the welding rolls 15 and 16, the electrode P is supplied from the electrode supply device 18 between the first separator sheet S1 and the second separator sheet S2. Supply of the electrode P from the electrode supply apparatus 18 is intermittently performed according to the rotation angle of the welding rolls 15 and 16. In the welding rolls 15 and 16, the electrode P is sandwiched between the first separator sheet S1 and the second separator sheet S2. The welding machine 17 joins the first separator sheet S1 and the second separator sheet S2 by welding to form a joint portion G. And the electrode laminated body A in which the electrode P was wrapped by 1st separator sheet S1 and 2nd separator sheet S2 is obtained.

  In the present embodiment, the camera 21 continuously images the first separator sheet S <b> 1 drawn toward the welding roll 15, and the image data captured by the camera 21 is transmitted to the control means 20. Further, the camera 22 continuously images the second separator sheet S <b> 2 pulled out toward the welding roll 16, and the image data captured by the camera 22 is transmitted to the control means 20. The control unit 20 analyzes the imaging data, and when a foreign matter such as metal powder, an abnormal part such as a flaw or a pinhole occurs in the first separator sheet S1 and the second separator sheet S2, the connection removing unit 25 of the moving body 23 is moved. Operate.

  Here, the case where the foreign material Y exists on the surface of 1st separator sheet S1 is demonstrated. As shown in FIG. 3, when the control unit 20 determines that the foreign substance Y exists in the first separator sheet S1 by analyzing the imaging data of the camera 21, it waits above the first separator sheet S1 after the foreign substance Y is detected. A command to lower the operating roller 24 is issued. As shown in FIG. 4, the operation roller 24 descends in response to a command from the control means 20, and pulls out the first separator sheet S1 in a downward direction different from the transport direction. When the first separator sheet S1 is pulled out, the rotation speed of the first separator roll 11 is increased corresponding to the lowering of the operation roller 24, and the pulling speed of the first separator sheet S1 from the first separator roll 11 is increased. At this time, the welding rolls 15 and 16 maintain the rotation without changing the rotation speed.

  By pulling out the first separator sheet S1 by the operation roller 24, there are a part in the first separator sheet S1 from the conveyance surface toward the operation roller 24 and a part that is folded back by the operation roller 24 toward the conveyance surface from the operation roller 24. It is formed (see FIG. 2A and FIG. 2B). These parts constitute the folded portion T. As shown in FIG. 5, the operation roller 24 descends so that the foreign matter Y is included in the folded portion T, and then stops descending.

  Next, the control means 20 issues a command to form a connecting part C in the width direction of the separator sheet S1 to the connecting / removing unit 25 so as to overlap and connect the separator sheet S1 at the turning part T. A command to excise the removal target portion T1 from the separator sheet S1 is issued. Further, the control means 20 issues a command to move the moving body 23 in the transport direction at the same speed as the transport speed of the separator sheet S1 when forming the connecting portion C and excising the removal target portion T1.

  In the connection removal unit 25 that has received a command from the control means 20, as shown in FIG. 6, the unit portions 29 and 30 are closest to each other, and the separator sheet S1 of the folded portion T overlaps. And the connection part C which connects the separator sheet S1 which overlapped the separator sheet S1 which the heating part 34 and the crimping | compression-bonding part 35 overlapped in the folding | returning part T is formed by welding. At the time when the connecting portion C is formed by welding, the foreign matter Y is located in the removal target portion T1. Almost simultaneously with the formation of the connecting portion C, the cutting blade 36 advances toward the folded portion T and cuts the folded portion T. The cutting blade 36 cuts the removal target portion T1 from the folded portion T, and the remaining target portion T2 including the connecting portion C remains in the separator sheet S1.

  By the way, the control means 20 always grasps the rotation angle of the pair of welding rolls 15 and 16 based on a signal from the rotation angle sensor. And the control means 20 sets the timing of formation of the connection part C so that the position where the connection part C is formed is included in the joint part G in the electrode laminate A. In the present embodiment, the welding roll 17 is provided with a welding machine 17 with a phase angle of 180 degrees. For this reason, as shown in FIG. 7, the distance K (hereinafter, referred to as “connecting portion C”) from the center of the joining portion G (including the position where the joining portion G is planned to be formed) closest to the welding machine 17 in the separator sheet S1. It is optimal if the “set distance K” is n times the circumferential length L of the welding roll half (n is an integer of 1 or more). When the length of the joint portion G is longer than that of the connection portion C, the set distance K is not limited to n times, and the distance (L · n + α, α: the connection portion C is included in the joint portion G). Allowable length). And the foreign material Y should just be contained in the removal object part T1 of the return | turnback part T in the removal timing of the removal object part T1.

  When the removal target portion T1 is cut off from the folded portion T, the remaining target portion T2 including the connecting portion C is sent to the welding roll 15 as a part of the separator sheet S1. The connecting portion C that has reached the welding roll 15 is included in the connecting portion C formed by the welding of the welding machine 17. On the other hand, the moving body 23 returns to the original position before the movement. Further, the operation roller 24 is lowered and retracted in the axial direction, and is separated from the separator sheet S1 (see FIG. 2B). The operation roller 24 separated from the separator sheet S1 moves up to a position higher than the conveying surface of the separator sheet S1. The operating roller 24 moves forward in the axial direction toward the separator sheet S1 after being lifted, and returns to the original position. On the other hand, as shown in FIG. 8, the unit parts 29 and 30 of the connection removal unit 25 return to their original positions while being separated from each other. Then, the moving body 23, the operation roller 24, and the connection removal unit 25 prepare for the removal of the next abnormal part.

  Although the abnormal part where the foreign matter Y has occurred in the first separator sheet S1 has been removed, even when an abnormal part occurs in the second separator sheet S2, the movement on the second separator sheet S2 side is the same as in the case of the first separator sheet S1. The body 23, the operation roller 24, and the connection removal unit 25 remove the abnormal part. Further, the cause of occurrence of the abnormal portion is not limited to the foreign matter Y, but is a flaw or pinhole in the first separator sheet S1 and the second separator sheet S2.

According to this embodiment, there exist the following effects.
(1) When the abnormal part is detected by the camera 21 (22), the first (second) separator sheet S1 (S2) including the abnormal part is pulled out and folded by the operation roller 24 in a direction different from the conveyance direction. A folded portion T is formed. A connecting portion C is formed to overlap and connect the first (second) separator sheet S1 (S2) by welding in the width direction of the folded portion T including the abnormal part. The folded portion T includes a removal target portion T1 that includes an abnormal part and does not include the connecting portion C. The removal target portion T1 including the abnormal part is removed by the connection removal unit 25, but the connection portion C is used as a part of the first (second) separator sheet S1 (S2) as the first (second) separator sheet S1 ( In S2), the remaining material is conveyed. As a result, for example, even if an abnormal portion exists in the first separator sheet S1, only the abnormal portion can be removed before being bonded to the other second separator sheet S2, for example.

(2) When the moving body 23 moves in the transport direction at the same speed as the transport speed of the first (second) separator sheet S1 (S2), the operation roller 24 and the connection removal unit 25 are the first (second). ) The separator sheet S1 (S2) moves in the transport direction at the same speed as the transport speed. As a result, the abnormal part can be removed without stopping the conveyance of the first (second) separator sheet S1 (S2). As a result, it is possible to efficiently remove the abnormal part and manufacture the electrode laminate A.

(3) The welding roller 15 and 16 wraps the electrode P with the first separator sheet S1 and the second separator sheet S2, and a welded joint G is formed on the first separator sheet S1 and the second separator sheet S2. The first separator sheet S1 and the second separator sheet S2 are bonded to each other by the joint portion G. The control means 20 controls the connection removal unit 25 in synchronization with the pair of welding rolls 15 and 16 so that the connection portion C is positioned at the joint portion G. For this reason, the connection part C formed in the 1st (2nd) separator sheet S1 (S2) which removed the abnormal site | part is joined by the welding rolls 15 and 16, and the junction part G is formed. Therefore, the connecting portion C does not contact the surface of the electrode P in the electrode laminate A.

(Second Embodiment)
An electrode laminate manufacturing apparatus according to a second embodiment will be described. In the present embodiment, the moving body is not provided with a connection removal unit. About the same structure as 1st Embodiment, description of 1st Embodiment is used and a code | symbol is used in common.

  In the electrode laminated body manufacturing apparatus 40 shown in FIG. 9, the operation roller 24 and the connection removal unit 25 are provided in the fixed body 41 which does not move. In addition, the welding rolls 15 and 16 have the same configuration as that of the first embodiment, but are controlled by the control unit 20 to be temporarily stopped without being continuously rotated when an abnormal site is generated. Specifically, the welding rolls 15 and 16 are stopped when the connecting portion C is formed in the folded portion T and the removal target portion T1 is excised from the folded portion T. The first separator roll 11 and the second separator roll 12 are stopped when the welding rolls 15 and 16 are stopped. After the removal target portion T1 is cut off from the folded portion T, the welding rolls 15 and 16 are rotated, and the first separator roll 11 and the second separator roll 12 are also rotated.

  According to this embodiment, there exists an effect equivalent to the effect (1), (3) of 1st Embodiment. Moreover, according to this embodiment, the welding rolls 15 and 16 stop when the connection part C is formed in the folding | turning part T, and the removal object part T1 is excised from the folding | returning part T. FIG. Further, the first separator roll 11 and the second separator roll 12 are stopped when the welding rolls 15 and 16 are stopped. For this reason, when an abnormal part occurs, the operation roller 24 and the connection removal unit 25 are moved to the first separator roll. There is no need to move the sheet S1 and the second separator sheet S2 at the same speed as the conveying speed. As a result, a mechanism for movement like the moving body 23 of the previous embodiment is not required, and the structure of the apparatus is simplified.

  The present invention is not limited to the above embodiment, and various modifications are possible within the scope of the gist of the invention. For example, the following modifications may be made.

In the above embodiment, the connecting portion is formed by welding, but the formation of the connecting portion is not limited to welding. For example, the connecting portion may be formed using an adhesive. Moreover, when forming a connection part by welding, you may make it form a connection part by ultrasonic welding instead of heat welding.
In the above embodiment, the first separator sheet and the second separator sheet are pulled out in the horizontal direction, but this is not restrictive. As shown in FIG. 10, the first separator sheet S1 and the second separator sheet S2 may be pulled out obliquely downward from above. In this case, the winding flaw by the welding rolls 15 and 16 of 1st separator sheet S1 and 2nd separator sheet S2 can be suppressed from said embodiment.
In the above embodiment, the camera is used as the detection unit that detects the abnormal part of the separator sheet, but the detection unit is not limited to the camera. For example, detection means by scanning using laser light may be used, or detection means by X-ray scanning may be used.
In the above embodiment, the operation means is the operation roller, but this is not restrictive. The shape and structure of the operation means are not particularly limited as long as the operation means can form the folded portion on the separator sheet. For example, the detection means may be a round bar or a sufficiently stretched string. Since the operating means is in contact with the separator sheet, a material or shape that does not damage the separator sheet is preferable.
In the above embodiment, two welding machines are provided on each of the pair of welding rolls, but the number of welding machines is not limited to two, and any number may be used. When the number of welding machines is an arbitrary number, the distance (set distance) from the center of the joining portion (including the position where the joining portion is planned to be formed) closest to the welding machine in the separator sheet is set in the welding roll. In the above embodiment, an example of an electrode laminate using a positive electrode as an electrode has been described. However, an electrode laminate using a negative electrode as an electrode may be used.

DESCRIPTION OF SYMBOLS 10, 40 Electrode body manufacturing apparatus 11 1st separator roll 12 2nd separator roll 15, 16 Welding roll 17 Welding machine 18 Electrode supply apparatus 20 Control means 21, 22 Camera (as detection means)
23 moving body 24 operation roller (as separator operation means)
25 Connection removal unit (as connection means and removal means)
34 Heating part 35 Pressure bonding part 36 Cutting blade 41 Fixed body A Electrode laminated body S1 1st separator sheet S2 2nd separator sheet T Folding part T1 Removal target part T2 Remaining target part C Connection part G Joint part P Electrode Y Foreign substance K Setting distance

Claims (5)

Detecting means for detecting an abnormal portion of the separator sheet conveyed continuously;
In the removal device for abnormal sites in the separator sheet, comprising a removing unit that removes the abnormal sites detected by the detection unit from the separator sheet,
Separator operating means for forming a folded portion including the abnormal part on the separator sheet by pulling out the separator sheet in a direction different from the conveyance direction and folding it after detection of the abnormal part;
A connecting means for forming a connecting portion that overlaps and connects the separator sheets at the folded portion in the width direction of the separator sheet;
Control means for controlling the separator operating means, the connecting means and the removing means based on the detection of the abnormal part,
The folded portion includes a removal target portion that includes the abnormal portion and does not include the connecting portion;
The apparatus for removing an abnormal part in a separator sheet, wherein the removing means cuts the part to be removed from the separator sheet. A movable body that is movable in the transport direction at the same speed as the transport speed of the separator sheet,
The apparatus for removing an abnormal part in a separator sheet according to claim 1, wherein the movable body includes the separator operating means, the connecting means, and the removing means. A pair of joining rolls that join a pair of the separator sheets conveyed from different directions and form a joining part that overlaps and joins the pair of separator sheets at a predetermined interval;
An electrode supply means for supplying an electrode between the pair of separator sheets,
The said control means controls the said connection means synchronizing with said pair of joining roll so that the said connection part is located in a junction part, The abnormality site | part in the separator sheet of Claim 1 or 2 characterized by the above-mentioned. Removal device.   The apparatus for removing an abnormal part in a separator sheet according to claim 1, wherein the control unit performs a control to stop the conveyance of the separator sheet when the abnormal part is detected by the detection unit. In the method for removing an abnormal part in the separator sheet that detects an abnormal part of the separator sheet that is continuously conveyed and removes the abnormal part,
After the detection of the abnormal part, the separator sheet including the abnormal part forms a folded part that is pulled out and folded in a direction different from the conveyance direction,
Forming a connecting portion that overlaps and connects the separator sheet to the folded portion in the width direction of the separator sheet, and includes the abnormal portion in the removal target portion of the folded portion;
The method for removing an abnormal site in a separator sheet, wherein the removal target portion is excised from the separator sheet.

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