JP6064558B2 - Electrode body manufacturing method and electrode winding apparatus - Google Patents

Description

  The present invention relates to an electrode body manufacturing method and an electrode winding apparatus for manufacturing an electrode body. More specifically, the present invention relates to an electrode body manufacturing method and an electrode winding apparatus that can suitably manufacture a wound electrode body formed by winding a positive electrode plate and a negative electrode plate.

  In recent years, batteries are used not only for portable electronic devices such as mobile phones and notebook personal computers, but also as power sources for vehicles such as hybrid cars and electric cars. Some of such batteries have a wound electrode body inside the case. The wound electrode body is manufactured by winding a strip-like positive and negative electrode plate while sandwiching a separator between them. The electrode plate is manufactured by forming an active material layer containing an active material on a metal foil serving as a current collector.

  By the way, the manufactured electrode plate may have a defective part such as a part where the metal foil and the active material layer are peeled off or a part where a scratch is generated. A high-quality battery cannot be manufactured using an electrode plate having such a defective portion. For this reason, the defective portion in the electrode plate must be removed in the battery manufacturing process. In removing the defective portion, it is preferable that the portion of the electrode plate to be discarded is as small as possible. Discarding the normal electrode plate other than the defective portion reduces the yield.

  For example, the present applicant has previously disclosed an electrode winding having an unwinding part for unwinding positive and negative electrode plates and separators for constituting a wound electrode body, and a winding part for winding them. A device has been filed (Patent Document 1). The electrode winding apparatus of Patent Document 1 includes a defective portion sensor for detecting a defective portion of an electrode plate on an electrode plate conveyance path from the electrode plate unwinding portion to the winding portion, and an electrode plate detected by the defective portion sensor. And a defective part removing unit for removing and discharging the defective part. Thereby, since it is possible to manufacture the wound electrode body while removing the defective portion suppression of the electrode plate, it is not necessary to provide another process for removing the defective portion. In addition, since the number of discarded electrode plates is small, it is said that the yield can be improved.

JP 2012-151064 A

  However, the electrode winding apparatus is provided with a complicated transport path such as an electrode plate, and there are many configurations other than the defective portion removal unit. The structure of the electrode winding device is further complicated by providing the defective portion removing portion on the electrode plate conveyance path. For this reason, it is very difficult to maintain and maintain the electrode winding device by providing the defective portion removing portion. Furthermore, there is a problem that the electrode winding device is large and expensive due to the provision of the defective portion removing portion.

  The present invention has been made to solve the above-described problems of the prior art. That is, the problem is to provide a method of manufacturing a wound electrode body and an electrode winding device that can appropriately remove defective portions of the electrode plate with a simple configuration and improve the yield. is there.

The electrode body manufacturing method of the present invention, which has been made for the purpose of solving this problem, rotates the core material while supplying the positive electrode plate, the negative electrode plate, and the separator from the respective supply portions to the core material. Is a method of manufacturing a wound electrode body by winding up a negative electrode plate and a separator, on the transport path of the positive electrode plate from the supply position of the positive electrode plate to the winding position of the core material Detect the defective part of the positive electrode plate that passes through the positive electrode detection position at the positive electrode detection position that is more than the winding length of the positive electrode plate for one electrode body from the winding position of the core material and goes upstream in the transport direction. , On the transport path of the negative electrode plate from the supply position of the negative electrode plate to the winding position of the core material, more than the winding length of the negative electrode plate for one electrode body from the winding position of the core material to the upstream side in the transport direction Negative electrode plate that passes through the negative electrode detection position at the negative electrode detection position A defective part is detected, and the winding length section that has passed the positive electrode detection position in the positive electrode plate and the winding length section that has passed the negative electrode detection position in the negative electrode plate do not include the defect part. In the case of a non-defective section, a wound type electrode body is manufactured by winding both electrode plates of the non-defective section with a core together with a separator. Of the sections and the negative electrode plate, when one of the wound length sections that have passed through the negative electrode detection position is a non-defective section and the other is a defective section including a defective portion, the electrode plate of the non-defective section is used as a core material. A wound wound body is manufactured by winding the electrode plate in the defective section with a core material without winding it in step 1. Of the positive electrode plate, the wound length section that has passed the positive electrode detection position, and the negative electrode plate , The winding length sections that passed the negative electrode detection position are all If it is a recessed section, a defective wound body is manufactured by winding both electrode plates of the defective section with a core material, and a defective wound body is manufactured by winding the electrode plate of the defective section with a core material. In this case, the division section obtained by dividing the defect section into a predetermined number of divisions in the conveyance direction is determined so that the most downstream division section on the most downstream side in the conveyance direction is longest, and the electrode plate of the defect section is formed. Of these, all of the divided section where the defective portion exists and the divided section located downstream in the transport direction from the divided section where the defective portion exists are wound with a core material, and the length of the most downstream divided section is When the defect winding body is manufactured by setting the length to be longer than the length of one equally divided section and shorter than the length of two equally divided sections when the defective section is equally divided by the number of divisions , The defect winding body is used as an electrode body manufacturing process. Is a manufacturing method of an electrode body, characterized that you et emissions.

  In the method for manufacturing an electrode body according to the present invention, when both the positive electrode plate and the negative electrode plate are good electrode plates that do not include a defective portion, the electrode bodies are manufactured using these non-defective electrode plates. This electrode body is then a good product that can be used in batteries. On the other hand, when at least one of the positive electrode plate and the negative electrode plate has a defect portion, the defect winding body is manufactured only by the electrode plate including the defect portion. The defective winding body is then discharged from the battery manufacturing process without being used in the battery.

That is, in the present invention, both the winding of the electrode body and the winding of the defective winding body can be performed at the same winding place. For this reason, the special structure which winds a defect winding body is unnecessary, and the defect part in an electrode plate can be removed appropriately with a simple structure. In addition, a non-defective electrode plate when one of the electrode bodies includes a defective portion is not used for winding the defective wound body but can be used for winding the electrode body thereafter. Therefore, a good electrode plate is not discharged and the yield is good. Furthermore, among the electrode plates including a defective portion, a section located on the upstream side in the transport direction from a portion where the defective portion exists is a non-defective portion. For this reason, the non-defective part of the electrode plate including the defective part is not discharged but used for the subsequent production of the electrode body. Thereby, the discharge length of the electrode plate including the defective portion can be shortened, and the yield can be improved. In addition, with respect to the defect section, the division section is determined so that the most downstream side in the conveyance direction is the longest, and the division section where the defect portion exists and the division section on the downstream side are used as defect winding bodies, thereby When there are many long defective parts, it is possible to improve the yield while simplifying the control system.

  In the electrode body manufacturing method described above, one of the winding length section that has passed the positive electrode detection position and the winding length section of the negative electrode plate that has passed the negative electrode detection position is the positive electrode plate. When it is a non-defective section and the other is a defective section including a defective portion, the supply of the electrode plate in the non-defective section may be stopped and the electrode plate in the defective section may be wound with a core material. This is because the non-defective electrode plate can be prevented from being wound around the defective wound body.

The present invention also provides a positive electrode plate supply unit that supplies a positive electrode plate for winding on a core material, a negative electrode plate supply unit that supplies a negative electrode plate for winding on the core material, and a winding material on the core material. An electrode winding apparatus comprising: a separator supply unit that supplies a separator; and a winding unit that winds the positive electrode plate, the negative electrode plate, and the separator while rotating the core material to form an electrode body. On the transport path of the positive electrode plate from the winding part to the winding part, the detection position is a position that extends from the winding part to the upstream side in the transporting direction for the length of the positive electrode plate for one electrode body or more. And a winding length of the negative electrode plate corresponding to one electrode body from the winding portion on the transport path of the negative electrode plate from the negative electrode plate supply portion to the winding portion. As described above, the position back to the upstream side in the transport direction is the detection position, and the negative electrode plate that passes through the detection position A negative electrode detection unit for detecting a depressed portion, and the winding unit detects a section of a winding length passing through a detection position of the positive electrode detection unit in the positive electrode plate, and a detection of the negative electrode detection unit in the negative electrode plate When all the winding length sections that have passed through the position are non-defective sections that do not include a defective portion, the electrode plates are manufactured by winding both electrode plates of the non-defective sections together with the separator on the core material, Among these, one of the winding length section that has passed the detection position of the positive electrode detector and the winding length section of the negative electrode plate that has passed the detection position of the negative electrode detector is a non-defective section, and the other is a defect. In the case of a defective section including a portion, a defective wound body is manufactured by winding the electrode plate in the defective section around the core material without winding the electrode plate in the non-defective section around the core material. Of the winding length that has passed the detection position of the positive electrode detector and the negative electrode of the negative electrode plate If any of the winding length sections that have passed through the detection position of the protruding portion are defect sections, a defect wound body is manufactured by winding both electrode plates of the defect sections around the core material, and the electrodes in the defect section When a defective wound body is manufactured by winding a plate around a core material, a divided section obtained by dividing a defective section into a predetermined number of divisions in the transport direction is defined as a most downstream divided section on the most downstream side in the transport direction. The length of the electrode plate in the defective section is determined to be the longest, and all of the divided sections where the defective portion exists and the divided sections located downstream in the transport direction from the divided section where the defective portion exists are centered. The length of the most downstream divided section is longer than the length of one equally divided section when the defective section is equally divided by the number of divisions, and is longer than the length of two equally divided sections. The length is set to a short length. , Also extends to an electrode winding apparatus, characterized in that the shall be discharged from the production process of the electrode body.

  Further, in the electrode winding apparatus described above, the positive electrode plate supply unit and the negative electrode plate supply unit include a winding length section that passes through a detection position of the positive electrode detection unit in the positive electrode plate, and a negative electrode in the negative electrode plate. When one of the winding length sections that have passed the detection position of the detection unit is a non-defective section and the other is a defective section, the supply of the electrode plate in the non-defective section may be stopped.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method and electrode winding apparatus of the winding type electrode body which aimed at the improvement of the yield while being able to remove appropriately the defective part in an electrode plate with a simple structure are provided.

It is sectional drawing which shows the battery which concerns on embodiment. It is a perspective view of the electrode body which concerns on embodiment. It is a figure which shows the positive electrode plate which comprises the same electrode body. It is a figure which shows the negative electrode plate which comprises the same electrode body. It is a figure explaining the overlapping state of the positive / negative electrode plate etc. in the same electrode body. It is a schematic block diagram of the electrode winding apparatus which concerns on a 1st form. It is a figure of the state which developed before winding of each member which constitutes an electrode body. It is a schematic block diagram of the electrode winding apparatus which concerns on a 2nd form. It is a flowchart for demonstrating the procedure of winding of the defect part winding body which concerns on a 2nd form. It is a figure for demonstrating the discharge pattern which concerns on a defect winding body. It is a figure for demonstrating the winding pattern which concerns on a defect winding body. It is a figure for demonstrating the division pattern which is not equally divided of a 2nd form.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the accompanying drawings. In the present embodiment, the electrode body manufacturing method and the electrode winding apparatus of the present invention are embodied for an electrode winding apparatus for manufacturing an electrode body of a lithium ion secondary battery.

[First embodiment]
[battery]
FIG. 1 shows a cross-sectional view of a battery 1 manufactured by the electrode winding apparatus according to the present embodiment. As shown in FIG. 1, the battery 1 is a cylindrical lithium ion secondary battery in which an electrode body 20 and an electrolytic solution 30 are accommodated in a battery container 10. The electrolytic solution 30 is made of an organic solvent in which a lithium salt is dissolved. The battery container 10 includes a battery container main body 11 and a lid 12.

  FIG. 2 is a perspective view of the electrode body 20 before being assembled as the battery 1. The electrode body 20 is a wound electrode body in which a positive electrode plate P, a negative electrode plate N, and separators S and T are wound in a cylindrical shape around an axis 40 (see FIGS. 2 to 5). As shown in FIGS. 1 and 2, the shaft core 40 is a cylindrical member that becomes the center when the electrode body 20 is wound.

  As shown in FIG. 3, the positive electrode plate P has a strip shape that is long in the longitudinal direction B (left-right direction in FIG. 3). The positive electrode plate P includes a positive electrode current collector foil PA made of an aluminum foil, and a positive electrode active material layer PB formed on a part of the positive electrode current collector foil PA. The positive electrode active material layer PB contains a positive electrode active material capable of inserting and extracting lithium ions. In addition, the positive electrode active material layer PB includes a conductive material for improving conductivity, a binder for fixing the positive electrode active material and the like to the surface of the positive electrode current collector foil PA, and the like.

  In addition, a portion of the positive electrode current collector foil PA where the positive electrode active material layer PB is not formed is referred to as a positive electrode non-forming portion P1. On the other hand, a portion where the positive electrode active material layer PB is formed is referred to as a positive electrode forming portion P2. As shown in FIG. 3, the positive electrode non-forming portion P <b> 1 is located at the upper end of the positive electrode plate P in the width direction A (vertical direction in FIG. 3). The positive electrode forming portion P2 is located at the lower end portion in the width direction A of the positive electrode plate P. Both the positive electrode non-forming part P1 and the positive electrode forming part P2 extend in a strip shape in the longitudinal direction B of the positive electrode plate P along one long side of the positive electrode plate P.

  As shown in FIG. 4, the negative electrode plate N has a strip shape that is long in the longitudinal direction B (left-right direction in FIG. 4). The negative electrode plate N has a negative electrode current collector foil NA made of a copper foil, and a negative electrode active material layer NB formed on a part of the negative electrode current collector foil NA. The negative electrode active material layer NB contains a negative electrode active material capable of inserting and extracting lithium ions. In addition, the negative electrode active material layer NB includes a binder and the like.

  Further, a portion of the negative electrode current collector foil NA where the negative electrode active material layer NB is not formed is referred to as a negative electrode non-forming portion N1. On the other hand, the part where the negative electrode active material layer NB is formed is referred to as a negative electrode forming part N2. As shown in FIG. 4, the negative electrode non-forming portion N <b> 1 is located at the lower end of the negative electrode plate N in the width direction A (vertical direction in FIG. 4). The negative electrode forming portion N2 is located at the upper end portion in the width direction A of the negative electrode plate N. Both of the negative electrode non-forming part N1 and the negative electrode forming part N2 extend in a strip shape in the longitudinal direction B of the negative electrode plate N along one long side of the negative electrode plate N.

  The electrode body 20 shown in FIG. 2 is obtained by winding a positive electrode plate P, a negative electrode plate N, and separators S and T while overlapping them as shown in FIG. In the superposition shown in FIG. 5, the positive electrode plate P, the negative electrode plate N, and the two separators S and T are superposed. The separator S and the separator T are made of the same material. In order to understand the superposition, only the codes are distinguished as S and T.

  The separators S and T are porous members that can transmit lithium ions. As the separators S and T, a porous film made of polypropylene (PP), polyethylene (PE) or the like can be used alone, or a composite material in which a plurality of these are laminated in the thickness direction can be used. The widths of the separators S and T are about the same as the widths of the positive electrode forming part P2 and the negative electrode forming part N2.

  As shown in FIG. 5, the positive electrode non-forming part P1 of the positive electrode plate P and the negative electrode non-forming part N1 of the negative electrode plate N are arranged so as to protrude in the opposite directions in the vertical direction of FIG. Therefore, in FIG. 2 showing the wound state, the positive electrode non-forming portion P1 located at the upper end portion is formed by superposing a plurality of positive electrode current collector foils PA. Further, the negative electrode non-forming portion N1 located at the lower end portion is obtained by superposing a plurality of negative electrode current collector foils NA.

  The power storage unit 21 located between the positive electrode non-forming part P1 and the negative electrode non-forming part N1 of the electrode body 20 of FIG. 2 includes a positive electrode forming part P2, a negative electrode forming part N2, and a separator as shown in FIG. This is a portion formed by winding S and T while being superimposed. For this reason, the electrical storage part 21 is a part which contributes to charging / discharging.

  In the battery 1 shown in FIG. 1, a positive electrode current collector plate 50 is connected to the positive electrode non-forming part P <b> 1 of the electrode body 20. A negative electrode current collector plate 60 is connected to the negative electrode non-forming portion N1 of the electrode body 20. The battery 1 performs charging and discharging in the power storage unit 21 of the electrode body 20 via the positive current collector 50 and the negative current collector 60.

[Electrode winding device]
A schematic configuration of the electrode winding apparatus 100 of the present embodiment is shown in FIG. The electrode winding apparatus 100 is an apparatus for continuously manufacturing the electrode body 20 by winding the positive electrode plate P, the negative electrode plate N, and the separators S and T. In FIG. 6, each part of the electrode winding apparatus 100 is drawn with a solid line, and each member used for winding is drawn with a broken line.

  As shown in FIG. 6, the electrode winding apparatus 100 includes a positive electrode plate unwinding portion 101, a negative electrode plate unwinding portion 102, separator unwinding portions 103 and 104, winding portions 105, 106, and 107, and a drive. Unit 108, positive electrode cutter 110, negative electrode cutter 112, separator cutter 113, positive electrode holding unit 120, negative electrode holding unit 121, pressing roller 130, positive electrode camera 140, negative electrode camera 141, and device control unit 150 And have.

  The positive plate unwinding unit 101 is for unwinding the positive plate P supplied to the winding unit 105. The negative electrode plate unwinding unit 102 is for unwinding the negative electrode plate N supplied to the winding unit 105. The separator unwinding portions 103 and 104 are for unwinding the separators S and T supplied to the winding portion 105, respectively.

  The winding portions 105, 106, and 107 are rotating shafts for attaching the shaft core 40. The winding parts 105, 106, and 107 can rotate respectively. Further, the winding portions 105, 106, and 107 are integrated and can rotate as indicated by an arrow C around the center O in FIG. As a result, the positions can be exchanged with each other. That is, the winding part 105 moves to the position of the winding part 106 by rotating 120 ° around the center O. Then, the winding unit 106 moves to the position of the winding unit 107, and the winding unit 107 moves to the position of the winding unit 105. The drive unit 108 plays the role of this rotational drive. As the drive unit 108, for example, a servo motor can be used.

  The winding portions 105, 106, and 107 all have the same structure. Therefore, these roles will be described as representatives when the winding units 105, 106, and 107 are at the positions shown in FIG. In the position of the winding part 105 shown in FIG. 6, the actual winding with the positive electrode plate P, the negative electrode plate N, and the separators S and T is performed. That is, the electrode body 20 is manufactured at the position of the winding part 105. For this reason, the winding part 105 can rotate in the direction of arrow D of FIG. The drive unit 108 also plays the role of this rotational drive.

  Further, at the position of the winding part 106 shown in FIG. 6, the axial core 40 of the electrode body 20 that has been wound is removed from the winding part 106. The good electrode body 20 that has been normally wound is removed from the winding portion 106 and then transported to a place where the next step is performed. In addition, at the position of the winding part 107, the shaft core 40 is prepared to prepare for a new winding.

  The positive electrode cutter 110 is for cutting the positive electrode plate P in the width direction (width direction A in FIG. 3). The negative electrode cutter 112 is for cutting the negative electrode plate N in the width direction (width direction A in FIG. 4). The positive electrode cutter 110 and the negative electrode cutter 112 are respectively used for the electrode body 20 of one battery 1 in the conveying direction (longitudinal direction B in FIGS. 3 and 4) of the positive electrode plate P and the negative electrode plate N being conveyed. Cut to length (hereinafter referred to as winding length).

  The separator cutter 113 is for cutting the separators S and T in the width direction (width direction A in FIG. 5). In addition, when the cutting by the separator cutter 113 is performed, the positive electrode plate P and the negative electrode plate N are after being cut by the positive electrode cutter 110 and the negative electrode cutter 112, respectively. Therefore, the separator cutter 113 cuts only the separators S and T at a time when cutting. Moreover, also about the separator cutter 113, the separators S and T are cut | disconnected so that it may become winding length about those conveyance directions (longitudinal direction B of FIG. 5).

  The positive electrode holding part 120 is for holding the positive electrode plate P when the positive electrode plate P is cut by the positive electrode cutter 110. That is, the state in which the positive electrode plate P is gripped and the state in which the grip is released are taken. The negative electrode holding portion 121 is for holding the negative electrode plate N when the negative electrode plate N is cut by the negative electrode cutter 112. That is, the state in which the negative electrode plate N is gripped and the state in which the grip is released are taken. Note that both the positive electrode grip 120 and the negative electrode grip 121 shown in FIG. 6 are in a state in which the grip is released.

  The pressing roller 130 is a free roller for pressing the positive electrode plate P, the negative electrode plate N, and the separators S and T against the shaft core 40 attached to the winding part 105. The pressing roller 130 is pressed toward the shaft core 40 (upward in FIG. 6). The positive electrode plate P, the negative electrode plate N, and the separators S, T being conveyed pass between the pressing roller 130 and the shaft core 40 while overlapping. At the time of passing, the positive electrode plate P, the negative electrode plate N, and the separators S and T are wound around the shaft core 40. The position where the winding of each member is started is a winding position Z as shown in FIG. The pressing roller 130 may be a hollow roller or a solid roller.

  The device control unit 150 is for controlling the operation of each unit of the electrode winding device 100. Therefore, by controlling each part of the electrode winding apparatus 100, the electrode body 20 is manufactured by winding each member. Also, the defect winding body to be described later is wound. The positive camera 140 and the negative camera 141 are for detecting defective portions of the positive plate P and the negative plate N, respectively. This point will be described in detail later.

  The electrode winding device 100 is a device that winds around the shaft core 40 while superposing the positive electrode plate P, the separator S, the negative electrode plate N, and the separator T in this order from the inside. Therefore, in the state of FIG. 6, the wound body 105 rotates in the direction of arrow D, whereby the electrode body 20 is manufactured. In addition to the configuration shown in FIG. 6, an ionizer for removing static electricity, a dancer roll for adjusting each member tension during conveyance, and the like are provided on the conveyance path of each member in the electrode winding apparatus 100. Is provided.

  Here, each of the positive electrode plate unwinding portion 101, the negative electrode plate unwinding portion 102, and the separator unwinding portions 103 and 104 unwinds each member for manufacturing the electrode body 20 to supply the winding portion 105. Is. Therefore, a hoop material formed by winding a plurality of members to be supplied to the winding portion 105 around each unwinding portion is mounted. The length of each member in the hoop material is much longer than the winding length of each member.

  In addition, the positive electrode plate P and the negative electrode plate N may have a defective portion when they are unwound from the positive electrode plate unwinding portion 101 and the negative electrode plate unwinding portion 102, respectively. The defective portion is, for example, a portion where the electrode active material layer is peeled off from the electrode current collector foil in the electrode plate. For example, it is a part where the surface of the electrode plate is scratched.

  FIG. 7 is a diagram showing the unfolded state of the positive electrode plate P, the negative electrode plate N, and the separators S and T of each winding length used for the electrode body 20 of one battery 1 before winding. In FIG. 7, the left end is the position at which each member starts to wind. That is, the left end is the downstream position of each member in the transport direction in the electrode winding apparatus 100, and is the most innermost position of winding in the electrode body 20 after manufacture. On the other hand, the right end is the position of the end of winding of each member. That is, the right end is the upstream position of each member in the transport direction in the electrode winding apparatus 100, and is the position on the outermost peripheral side of winding in the electrode body 20.

  As shown in FIG. 7, the winding length of the positive electrode plate P is LP, the winding length of the negative electrode plate N is LN, and the winding length of the separators S and T is LS. In this embodiment, the winding lengths LS of the separators S and T are the same length. The winding length LS of the separators S and T is slightly longer than the winding length LP of the positive electrode plate P and the winding length LN of the negative electrode plate N. Further, the winding length LN of the negative electrode plate N is slightly longer than the winding length LP of the positive electrode plate P.

  And the defect part K exists in the negative electrode plate N shown in FIG. It is not preferable to manufacture the electrode body 20 using the negative electrode plate N having the defect portion K. This is because the high-quality battery 1 cannot be manufactured. Note that the positive electrode plate P shown in FIG. 7 is a non-defective product having no defective portion. An NG mark is printed in advance at the position of the defective portion K of the negative electrode plate N before being attached to the negative electrode plate unwinding portion 102 of the electrode winding device 100.

  The NG mark related to the defective portion K is printed at the same position as the defective portion K in the transport direction of the negative electrode plate N in the electrode winding apparatus 100. In other words, the NG mark is printed at the same position in the left-right direction at the position above or below the defective portion K in FIG. Further, the NG mark is printed on the surface on the outer peripheral side of the negative electrode plate N in the hoop material of the negative electrode plate N attached to the negative electrode plate unwinding portion 102 of FIG. In other words, even when there is a defective portion K on the inner peripheral side of the hoop material of the negative electrode plate N, it is printed on the outer peripheral side surface that is the back surface. In the case where the positive electrode plate P has a defective portion, an NG mark is similarly printed at the position of the defective portion.

  And the electrode winding apparatus 100 of this form has the positive electrode camera 140 and the negative electrode camera 141, as shown in FIG. The positive camera 140 and the negative camera 141 are for detecting the positions of defective portions of the positive plate P and the negative plate N, respectively. Specifically, the positive camera 140 and the negative camera 141 detect the positions of the defective portions by detecting NG marks printed at the positions of the defective portions of the positive plate P and the negative plate N, respectively.

  In the positive camera 140, the upper surface of the positive electrode plate P unwound from the positive electrode unwinding unit 101 on the conveyance path is set as a detection position. A detection position of the positive electrode plate P by the positive camera 140 is defined as a positive electrode detection position X. Thereby, the positive camera 140 detects the NG mark of the positive plate P printed on the outer peripheral surface of the hoop material at the detection position X. For this reason, the positive electrode plate P located at the winding position Z from the positive electrode detection position X has already been detected by the positive electrode camera 140 for the presence or absence of a defective portion and its position.

  Further, the negative electrode camera 141 uses the upper surface on the transport path of the negative electrode plate N unwound from the negative electrode plate unwinding section 102 as a detection position. The detection position of the negative electrode plate N by the negative electrode camera 141 is defined as a negative electrode detection position Y. Thereby, the negative electrode camera 141 detects the NG mark of the negative electrode plate N printed on the outer peripheral surface of the hoop material at the detection position Y. For this reason, with respect to the negative electrode plate N located from the negative electrode detection position Y to the winding position Z, the presence or absence of a defective portion and its position have already been detected by the negative electrode camera 141.

  Note that the position of the defective portion detected by the positive camera 140 or the negative camera 141 is grasped by the device controller 150 even if the positive plate P or the negative plate N is subsequently transported. This is because the transport speed and transport path of the positive electrode plate P and the negative electrode plate N are known by design.

  In the electrode winding apparatus 100, the length from the positive electrode detection position X to the winding position Z on the transport path of the positive electrode plate P is longer than the winding length LP of the positive electrode plate P. The length from the negative electrode detection position Y to the winding position Z on the conveyance path of the negative electrode plate N is also equal to or longer than the winding length LN of the negative electrode plate N.

  Furthermore, in the electrode winding apparatus 100, when the rear end (right end in FIG. 7) of the winding length LP of the positive electrode plate P is at the positive electrode detection position X, the winding start of the negative electrode plate N at the winding length LN is started. The front end (left end in FIG. 7) is located upstream of the winding position Z in the transport direction. When the trailing end of the winding length LN of the negative electrode plate N is at the negative electrode detection position Y, the leading end of the winding length LP of the positive electrode plate P is more in the transport direction than the winding position Z. It is supposed to be on the upstream side.

  When the positive electrode P is not detected by the positive camera 140 while the positive electrode plate P is transported the length from the positive electrode detection position X to the winding position Z, the positive electrode detection position X is changed from the winding position Z to the winding position Z. The section of the winding length LP in the positive electrode plate P at the position is non-defective. When the negative electrode plate N is transported the length from the negative electrode detection position Y to the winding position Z, if no defective portion is detected by the negative electrode camera 141, the negative electrode detection position Y to the winding position Z is detected. The section of the winding length LN of the negative electrode plate N at the position is a non-defective product. Therefore, the positive electrode plate P with the winding length LP located at the position of the winding position Z from the positive electrode detection position X and the negative electrode plate N with the winding length LN located at the position from the negative electrode detection position Y to the winding position Z. If these are non-defective products, these are wound together with the separators S and T in the winding unit 105. Thereby, a good electrode body 20 is manufactured.

  On the other hand, as shown in FIG. 7, when the negative electrode plate N has a defective portion K, this is detected by the negative electrode camera 141. In addition, since the positive electrode plate P of FIG. 7 has no defect portion, the positive electrode camera 140 does not detect the defect portion. And the electrode winding apparatus 100 of this form manufactures a winding body so that the positive electrode plate P of a good product may not be wound, when the defect part K of the negative electrode plate N is detected by the negative electrode camera 141. FIG.

  Specifically, with respect to the negative electrode plate N and the separators S and T, even when a defect portion K is detected in the negative electrode plate N by the negative electrode camera 141, the negative electrode plate unwinding portion 102, the separator unwinding portion 103, The supply to the winding unit 105 by 104 is continued. And about the negative electrode plate N and the separators S and T, all the part for the length of those winding length LN and LS is wound in the winding part 105. FIG.

  On the other hand, when the defective portion K of the negative electrode plate N is detected by the negative electrode camera 141, the supply of the non-defective positive electrode plate P to the winding unit 105 by the positive electrode plate unwinding unit 101 is stopped. The position at which the positive electrode plate P is stopped may be any position before the winding start side tip of the winding length LP reaches the winding position Z.

  As described above, when the rear end of the winding end LN in the winding length LN of the negative electrode plate N is at the negative electrode detection position Y, the leading end of the winding start LP in the winding length LP of the positive electrode plate P is from the winding position Z. Is also located upstream in the transport direction. That is, when the negative electrode camera 141 detects the defective portion K of the negative electrode plate N at the negative electrode detection position Y, the leading end on the winding start side of the positive electrode plate P having the winding length LP is before reaching the winding position Z. Therefore, the electrode winding apparatus 100 can stop the conveyance of the positive electrode plate P before the leading end on the winding start side of the positive electrode plate P having the winding length LP reaches the winding position Z.

  When the negative electrode plate N has a defective portion K, the wound body manufactured by winding the wound portion 105 winds the negative electrode plate N having the defective portion K together with the separators S and T around the shaft core 40. It is a defect winding body. The defective wound body does not include a good positive electrode plate P. This is because the conveyance of the positive electrode plate P is stopped before the leading end of the winding length LP on the winding start side reaches the winding position Z. The non-defective positive electrode plate P is then used for winding a new electrode body 20. Further, the defective wound body is removed at the position of the wound portion 106 and discharged to the discharge place of the defective wound body.

  The discharge place of the defective wound body is a place different from the place where the non-defective electrode body 20 is conveyed. Thereby, the defective portion K of the negative electrode plate N is removed from the manufacturing process of the battery 1. In the electrode winding apparatus 100, the winding speed of the defective wound body by the winding unit 105 is set faster than the winding speed of the non-defective electrode body 20. The defective winding body is not used for the battery 1 thereafter. Therefore, there is no problem even if wrinkles or internal stress is generated in the defective wound body by increasing the winding speed. Then, by making the winding speed of the defective winding body faster than the winding speed of the electrode body 20, the time required for winding the defective winding body is shortened.

  When the winding speed of the defective wound body is too high, the positive electrode plate P, the negative electrode plate N, the separators S and T on the upstream side of the section wound as the defective wound body are wrinkled or internally Stress may be generated. When wrinkles or internal stresses are generated in the positive electrode plate P, the negative electrode plate N, the separators S, T on the upstream side of the section wound as a defective winding body, these are subsequently converted into a good electrode body 20. There is a risk that it cannot be used. For this reason, the winding speed of the defective wound body is such that the positive electrode plate P, the negative electrode plate N, and the separators S and T that are used for winding the electrode body 20 thereafter are free from wrinkles and internal stress. Has been.

  In the above description, the case where the positive electrode plate P is a non-defective product and the negative electrode plate N has a defective portion K has been described. However, the same applies to the case where the negative electrode plate N is a non-defective product and the positive electrode plate P has a defective portion. That is, when the positive camera 140 detects a defective portion of the positive electrode plate P, the conveyance of the negative electrode plate N is stopped. Then, by winding the positive electrode plate P with a wound length LP having a defective portion together with the separators S and T, a defective wound body that does not include the non-defective negative electrode plate N is manufactured. And what is necessary is just to discharge | emit the defect winding body to the discharge place of a defect winding body. Further, when both the positive electrode plate P and the negative electrode plate N have a defective portion, the defect winding body is naturally wound by the positive electrode plate P having a winding length LP and the negative electrode plate N having a winding length LN. Just do it.

  As described in detail above, when the negative electrode plate N has a defective portion K, the electrode winding apparatus 100 according to the present embodiment uses the entire length LN of the negative electrode plate N having the defective portion K. The winding unit 105 performs winding. The defective winding body related to the winding is then discharged to the discharge location of the defective winding body. Therefore, the defective portion K of the negative electrode plate N can be removed. In addition, the electrode winding apparatus 100 also has a configuration in which the wound body is wound by the winding portion 105 that winds the electrode body 20. That is, the electrode winding apparatus 100 is simple because it does not require a special configuration for removing the defective portion. Further, the defective wound body does not include the positive electrode plate P which is a non-defective product. This is because the non-defective positive electrode plate P is stopped before the winding leading end reaches the winding position Z. The non-defective positive electrode plate P whose conveyance has been stopped is used in the subsequent winding of the new electrode body 20. Thereby, the normal positive electrode plate P is not discharged, and the yield is good.

  In addition, this form is only a mere illustration and does not limit this invention at all. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, when a defective portion K is detected in the negative electrode plate N, the defective winding body may be wound so as not to wind the non-defective positive electrode plate P, and the conveyance of the positive electrode plate P is necessarily stopped. There is no. That is, it is only necessary that the winding start side tip of the positive electrode plate P having the winding length LP does not reach the winding position Z during winding of the defective wound body. Therefore, after the defective portion K is detected in the negative electrode plate N, the conveyance speed of the positive electrode plate P may be decreased.

[Second form]
The second embodiment will be described. The electrode winding apparatus according to the present embodiment winds only the winding start side portion of the winding length including the defective portion of the electrode plate having the defective portion when the defective wound body is wound. Of the electrode plate having a defective portion, the winding end portion of the winding length not including the defective portion is used for the subsequent manufacture of the electrode body 20. This is different from the first mode in which the winding length of the defective winding body is wound on the electrode plate having the defective portion. In addition, about the electrode body manufactured with the electrode winding apparatus which concerns on this form, it is the same as a 1st form.

  FIG. 8 is a schematic configuration diagram of the electrode winding apparatus 200 of the present embodiment. The electrode winding apparatus 200 includes a positive electrode discharge camera 240 and a negative electrode discharge camera 241 in addition to the configuration of the electrode winding apparatus 100 of the first embodiment. In the positive electrode discharge camera 240, the upper surface of the positive electrode plate P on the conveyance path is set as a detection position. The detection position of the positive electrode discharge camera 240 is immediately before the winding position Z on the transport path of the positive electrode plate P.

  The negative electrode discharge camera 241 uses the upper surface of the negative electrode plate N on the transport path as the detection position. The detection position of the negative electrode discharge camera 241 is immediately before the winding position Z on the negative electrode plate N conveyance path. The positive electrode discharge camera 240 and the negative electrode discharge camera 241 are for detecting defective portions of the positive electrode plate P and the negative electrode plate N, respectively. Specifically, the positive discharge camera 240 and the negative discharge camera 241 detect NG marks printed in advance on defective portions of the positive plate P and the negative plate N, respectively, similarly to the positive camera 140 and the negative camera 141, respectively. , Detect defective parts. For this reason, the same thing as the positive electrode camera 140 and the negative electrode camera 141 can be used.

  The device control unit 250 is for controlling the operation of each unit of the electrode winding device 200. In addition, the apparatus control part 250 of this form performs winding of a defective winding body by a method different from the first form.

  In the electrode winding apparatus 200 according to this embodiment, when a defective portion in the positive electrode plate P and the negative electrode plate N is detected, only the winding start side portion of the winding length including the defective portion is wound, To do. The specific procedure will be described with reference to the flowchart shown in FIG. In the following description, it is assumed that the positive electrode plate P is a non-defective product and the negative electrode plate N has a defective portion.

  First, the defective part of the negative electrode plate N unwound from the negative electrode plate unwinding part 102 is detected by the negative electrode camera 141 (S101). Further, the position of the defective portion detected by the negative electrode camera 141 is grasped to some extent by the device control unit 250 even if the negative electrode plate N is subsequently conveyed. Also in the present embodiment, the positive electrode plate P, which is a non-defective product, is transported before the leading end on the winding start side reaches the winding position Z because the defect portion of the negative electrode plate N is detected by the negative electrode camera 141. Is stopped.

  Next, the detected defective portion is converted into position information determined in the conveyance direction of the negative electrode plate N (S102). In this embodiment, as shown in FIG. 10, the negative electrode plate N having a winding length LN is converted into position information of each negative electrode area of Na, Nb, and Nc, which is equally divided into three in the conveyance direction. The negative electrode areas Na, Nb, and Nc are assigned in this order from the leading end side of the winding start of the negative electrode plate N having the winding length LN. The lengths of the negative electrode regions Na, Nb, and Nc are each 1/3 of the winding length LN in the conveyance direction of the negative electrode plate N.

  Next, the discharge pattern is determined based on the position information of the defective portion of the negative electrode plate N (S103). In this embodiment, the discharge pattern is determined according to FIG. 10 depending on which negative electrode region has a defective portion among the negative electrode regions Na, Nb, and Nc. For example, the discharge pattern is determined as pattern 1 in FIG. 10 when there is a defective portion only in the negative electrode region Na. Further, for example, when there is a defect in the negative electrode region Na and the negative electrode region Nc, the pattern 3 is determined by FIG.

  When the pattern 1 is determined, only the negative electrode area Na of the negative electrode plate N is wound as a discharge pattern, and this is wound as a defective wound body, and the negative electrode area Nb and the negative electrode area Nc are used for the next electrode body 20. If the pattern 2 is determined, the negative electrode region Na and the negative electrode region Nb are used as a discharge pattern, which is wound as a defect winding body, and the negative electrode region Nc is used for the next electrode body 20. When the pattern 3 is determined, the negative electrode region Na, the negative electrode region Nb, and the negative electrode region Nc are all used as a discharge pattern and wound as a defect winding body.

  That is, in the negative electrode plate N having a winding length LN, all of the negative electrode region including the defective portion and the negative electrode region positioned on the winding start side with respect to the negative electrode region including the defective portion are wound as a defective wound body. . Therefore, in this embodiment, the negative electrode cutter 112 cuts the negative electrode plate N when the winding end side of the determined discharge pattern is at the cutting position of the negative electrode cutter 112. Note that the conveyance of the negative electrode plate N upstream of the cut discharge pattern is stopped before reaching the winding position Z so that it is not wound as a defective wound body. That is, after cutting according to the discharge pattern, supply of the negative electrode plate N to the winding unit 105 by the negative electrode plate unwinding unit 102 is stopped.

  Subsequently, the winding pattern of the defective wound body is determined based on the discharge pattern determined in step S103 (S104). As shown in FIG. 11, in this embodiment, a control method such as a winding speed in the winding unit 105 is determined as a winding pattern from the discharge pattern. In FIG. 11, a pattern when the electrode body 20 is manufactured by winding each non-defective member is shown as a non-defective pattern.

  The maximum speed of the winding speed shown on the vertical axis in FIG. 11 is set faster in the case of winding the discharge pattern than in the case of the non-defective pattern. This is because the defective winding body related to the discharge pattern is not used for the battery 1. As a result, the winding time of the defective wound body shown on the horizontal axis is shorter for the discharge pattern than for the non-defective pattern. Furthermore, the shorter the discharge pattern, the shorter the winding time. That is, the shorter the discharge pattern, the shorter the time required for winding the defective wound body.

  And the actual winding of the defective winding body in the winding part 105 is performed by the winding pattern determined in step S104 (S105). Further, a final confirmation is made that the defective portion of the negative electrode plate N is wound as a defective wound body and discharged by the negative electrode discharge camera 241 (S106).

  As described above, the position of the defective portion of the negative electrode plate N is detected to some extent by the device control unit 250 after being detected by the negative electrode camera 141. However, depending on the specifications of the battery 1, the winding length LN of the negative electrode plate N is very long. Therefore, the position of the defective portion of the negative electrode plate N detected immediately after being unwound by the negative electrode plate unwinding unit 102 and then grasped by the apparatus control unit 250 is not so reliable when reaching the winding unit 105. It may not be high. For this reason, the defective part of the negative electrode plate N is detected again by the negative electrode discharge camera 241 immediately before the winding part 105 for winding the defective wound body. Thereby, it is possible to perform a highly reliable confirmation that the defective portion has been wound as a defective wound body.

  Further, the defective winding body is then removed at the position of the winding portion 106 and discharged to the discharge place of the defective winding body. In the negative electrode plate N having a winding length LN, the portion of the negative electrode region located closer to the end of winding than the negative electrode region including the defective portion is a non-defective portion having no defective portion. Therefore, the non-defective part of the negative electrode plate N is used in the subsequent winding of the new electrode body 20 together with the non-defective positive electrode plate P. Therefore, when cutting according to the discharge pattern is performed by the negative electrode cutter 112, cutting at the winding end side of the winding length LN of the negative electrode plate N according to the discharge pattern is not performed.

  The number of divisions related to the discharge pattern is not limited to three divisions. The larger the number of divisions related to the discharge pattern, the better from the viewpoint of improving the yield. When the defective portion exists on the winding start side of the negative electrode region, the winding end side of the negative electrode region is a non-defective portion. However, the non-defective part is also wound as a defective wound body due to the defective part in the same negative electrode region. Therefore, as the number of divisions related to the discharge pattern increases, the discharge length wound as a defective wound body of the non-defective part of the electrode plate can be shortened. That is, the yield can be improved.

  Specifically, for example, when the division relating to the discharge pattern is divided into three equal parts, when there is one defective portion in the negative electrode plate N of the winding length LN, the probability that there is a defective portion in each negative electrode region is 1 / 3. For this reason, when the division relating to the discharge pattern is divided into three equal parts, the expected value of the length of the negative electrode plate N wound as a defective wound body is approximately 67% of the wound length LN.

  On the other hand, when the division related to the discharge pattern is divided into four equal parts, when there is one defective part in the negative electrode plate N of the winding length LN, the probability that there is a defective part in each negative electrode region is 1/4. is there. For this reason, when the division related to the discharge pattern is divided into four equal parts, the expected value of the length of the negative electrode plate N wound as a defective wound body is 62.5% of the wound length LN. Therefore, the expected value of the length of the negative electrode plate N wound as a defective wound body may be shorter when the division relating to the discharge pattern is divided into four equal parts. Recognize. That is, it can be seen that the yield of the negative electrode plate N is good.

  Furthermore, the division relating to the discharge pattern is not limited to equal division. The division relating to the discharge pattern may be, for example, three divisions as shown in FIG. That is, in the division shown in FIG. 12, the negative electrode region Na is a region having a length that is ½ of the winding length LN from the leading end of the negative electrode plate N on the winding start side. Further, a region having a length of 1/4 of the winding length LN from the winding end side of the negative electrode region Na is sequentially set as a negative electrode region Nb and a negative electrode region Nc.

  The defective portion of the negative electrode plate N is not necessarily a dot-like one. The negative electrode plate N has few point-like defect portions, and there may be many defect portions that are long and continuous in the conveying direction. Further, the length of the defect portion that is long in the transport direction may be, for example, a length that is 1/3 to 1/2 of the winding length LN.

  When such a defective portion is on the winding start side of the negative electrode plate N having a winding length LN, the negative electrode plate N that is wound and discharged as a defective winding body when the division related to the discharge pattern is divided into three equal parts. The length of is 2/3 of the winding length LN. On the other hand, when the division relating to the discharge pattern is divided into three as shown in FIG. 12, the length of the negative electrode plate N to be discharged is ½ of the winding length LN. That is, when there are many defective portions having a length of 1/3 to 1/2 of the winding length LN, even if the number of divisions related to the discharge pattern is determined to be 3 divisions, the division is equally divided into 3 divisions. However, it is preferable to divide into three as shown in FIG. This is because, in the case of the three divisions as shown in FIG. 12, the length of the discharged negative electrode plate N can be shortened and the yield can be improved as compared with the case of the three divisions.

  Further, even when there are many defective portions that are long in the transport direction, it is naturally possible to improve the yield by increasing the number of divisions related to the discharge pattern. However, increasing the number of divisions increases the discharge pattern and the control system becomes complicated. Therefore, when there are many defective parts that are long in the transport direction, dividing the discharge pattern into non-equal parts can reduce the number of divisions, simplify the control system, and improve the yield. There are things you can do.

  In the above description, the case where the positive plate P is a non-defective product and the negative plate N has a defective portion has been described. However, when the negative electrode plate N is a non-defective product and the positive electrode plate P has a defective portion, the defective portion of the positive electrode plate P can be similarly removed. In addition, when both the positive electrode plate P and the negative electrode plate N have a defective portion, the negative electrode region including the defective portion of each of the positive electrode plate P having the winding length LP and the negative electrode plate N having the winding length LN, The defective wound body may be wound by the negative electrode region on the winding start side with respect to the negative electrode region.

  As described above in detail, when the electrode winding apparatus 200 according to the present embodiment detects a defective portion of the negative electrode plate N, the negative electrode plate including the defective portion in the negative electrode plate N having the winding length LN, All of the negative electrode region located on the winding start side of the negative electrode plate N with respect to the negative electrode region including the part is wound. The defective winding body related to the winding is then discharged to the discharge location of the defective winding body. Thereby, the defective part of the negative electrode plate N can be removed. Also, the electrode winding apparatus 200 is simple because it does not require a special configuration for removing defective portions. Further, the non-defective negative electrode region located on the winding end side of the negative electrode region N including the defective portion in the negative electrode plate N having the winding length LN is used in the subsequent winding of the electrode body 20. That is, the discharge length of the negative electrode plate N can be reduced, and the non-defective positive electrode plate P is not discharged, so that the yield is good.

  In addition, this form is only a mere illustration and does not limit this invention at all. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, also in this embodiment, when a defective portion is detected in the negative electrode plate N, the defective winding body may be wound so as not to wind the non-defective positive electrode plate P. There is no need to stop the transport. That is, it is only necessary to reduce the conveying speed of the positive electrode plate P. Similarly, it is not always necessary to stop the conveyance of the negative electrode plate N on the upstream side of the discharge pattern after cutting according to the discharge pattern.

40 Axle core 101 Positive electrode unwinding portion 102 Negative electrode unwinding portion 103, 104 Separator unwinding portion 105, 106, 107 Winding portion K Defect portion N Negative electrode plate P Positive electrode plate S, T Separator X Positive electrode detection position Y Negative electrode detection Position Z Winding position

Claims (4)

While winding the positive electrode plate, the negative electrode plate, and the separator toward the core material from the respective supply units, the core material is rotated to manufacture the wound electrode body by winding up the positive electrode plate, the negative electrode plate, and the separator. In the manufacturing method of the electrode body
From the supply position of the positive electrode plate to the winding position of the core material, the winding length of the positive electrode plate for one electrode body extends from the winding position of the core material to the upstream side in the conveyance direction. At the positive electrode detection position, the defective part of the positive electrode plate passing through the positive electrode detection position is detected,
On the negative electrode plate conveyance path from the negative electrode plate supply position to the core winding position, it goes back from the winding position of the core material to the upstream side of the conveyance direction by more than the winding length of one electrode plate. At the negative electrode detection position, the defective part of the negative electrode plate passing through the negative electrode detection position is detected,
Of the positive electrode plate, the winding length section that has passed the positive electrode detection position, and
If any of the negative electrode plates that pass through the negative electrode detection position is a non-defective section that does not include a defective portion, both electrode plates in the non-defective section are wound with a core together with the separator. To produce a wound electrode body,
Of the positive electrode plate, the winding length section that has passed the positive electrode detection position, and
In the negative electrode plate, when one of the winding length sections that have passed through the negative electrode detection position is a non-defective section and the other is a defective section including a defective portion, the electrode plate in the non-defective section is wound with a core material. Without producing a defective wound body by winding the electrode plate of the defective section with a core material,
Of the positive electrode plate, the winding length section that has passed the positive electrode detection position, and
If any of the negative electrode plates that have passed through the negative electrode detection position is a defective region, a defective wound body is manufactured by winding both electrode plates of the defective region with a core material. ,
When a defective wound body is manufactured by winding the electrode plate in the defective section with a core material, the divided section obtained by dividing the defective section into a predetermined number of divisions in the transport direction is defined as the most downstream side in the transport direction. The most downstream division section is determined to be the longest, and among the electrode plates in the defect section, the division section where the defect portion exists, and the division section located downstream in the transport direction from the division section where the defect portion exists All of the above is wound with a core material,
The length of the most downstream divided section is longer than the length of one equally divided section when the defective section is equally divided by the number of divisions, and shorter than the length of two equally divided sections. Stipulated in
Method of manufacturing defects winding the defect wound body is when producing Kaitai, electrode body, characterized that you discharged from the manufacturing process of the electrode body. In the manufacturing method of the electrode body of Claim 1,
Of the positive electrode plate, the winding length section that has passed the positive electrode detection position, and
In the negative electrode plate, when one of the winding length sections passing through the negative electrode detection position is a non-defective section and the other is a defective section including a defective portion, the supply of the electrode plate in the non-defective section is stopped. , A method of manufacturing an electrode body, wherein an electrode plate in a defective section is wound with a core material. A positive electrode plate supply section for supplying a positive electrode plate for winding on the core material;
A negative electrode plate supply section for supplying a negative electrode plate for winding on the core material;
A separator supply section for supplying a separator for winding on the core material;
In an electrode winding apparatus having a winding part that winds a positive electrode plate, a negative electrode plate, and a separator while rotating a core material to form an electrode body,
On the transport path of the positive electrode plate from the positive electrode plate supply section to the winding section, a position that is longer than the winding length of the positive electrode plate for one electrode body from the winding section and that is traced upstream in the transport direction is detected. A positive electrode detector for detecting a defective portion of the positive electrode plate passing through the detection position;
On the negative electrode plate conveyance path from the negative electrode plate supply unit to the winding unit, a position that is longer than the winding length of the negative electrode plate for one electrode body from the winding unit and goes upstream in the conveyance direction is detected. A negative electrode detector that detects a defective portion of the negative electrode plate passing through the detection position,
The winding part is
Of the positive electrode plate, the winding length section that has passed the detection position of the positive electrode detection unit, and
If any of the negative electrode plates that pass through the detection position of the negative electrode detector is a non-defective section that does not include a defective portion, both electrode plates in the non-defective section are used as a core material together with the separator. Winding to manufacture the electrode body,
Of the positive electrode plate, the winding length section that has passed the detection position of the positive electrode detection unit, and
Of the negative electrode plates, when one of the winding length sections that have passed through the detection position of the negative electrode detection unit is a non-defective section and the other is a defective section including a defective portion, the electrode plate in the non-defective section is used as a core material. Without winding, the electrode plate in the defective section is wound around the core material to produce a defective wound body,
Of the positive electrode plate, the winding length section that has passed the detection position of the positive electrode detection unit, and
In the negative electrode plate, when both of the winding length sections that have passed through the detection position of the negative electrode detection section are defective sections, both electrode plates in the defective section are wound around the core material to form the defective winding body. Manufacturing,
When a defective wound body is manufactured by winding an electrode plate in a defective section around a core material, a divided section obtained by dividing the defective section into a predetermined number of divisions in the transport direction is set to the most downstream side in the transport direction. The downstream division section is determined to be the longest, and among the electrode plates in the defect section, the division section where the defect portion exists and the division section located on the downstream side in the transport direction from the division section where the defect portion exists Winding everything on the core,
The length of the most downstream divided section is longer than the length of one equally divided section when the defective section is equally divided by the number of divisions, and shorter than the length of two equally divided sections. Stipulated in
Electrode winding apparatus, characterized in that when manufactured defect wound body the defect wound body, is shall be discharged from the production process of the electrode body. In the electrode winding apparatus according to claim 3,
The positive electrode plate supply unit and the negative electrode plate supply unit are:
Of the positive electrode plate, the winding length section that has passed the detection position of the positive electrode detection unit, and
In the negative electrode plate, when one of the winding length sections that have passed through the detection position of the negative electrode detector is a non-defective section and the other is a defective section, the supply of the electrode plate in the non-defective section is stopped. An electrode winding device characterized by being.

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