JP5659818B2 - Electrode winding device and battery manufacturing method - Google Patents

Description

  The present invention relates to an electrode winding device and a battery manufacturing method. More specifically, the present invention relates to an electrode winding apparatus and a battery manufacturing method capable of suitably winding a positive electrode plate and a negative electrode plate.

  Batteries are used in various fields such as electronic devices such as mobile phones and personal computers, vehicles such as hybrid vehicles and electric vehicles. Some of such batteries include a positive electrode plate, a negative electrode plate, and an electrolyte. Further, in order to insulate the positive electrode plate and the negative electrode plate, it is common to provide a separator between them. Among such batteries, there is a battery including a wound electrode body that is wound with a separator interposed between a positive electrode plate and a negative electrode plate.

  When manufacturing a wound electrode body, if there is a defective portion on the positive electrode plate or the negative electrode plate, the portion of the defective portion may be wound. Here, the defective portion is a portion where the positive electrode plate or the negative electrode plate has scratches or peeling portions. The quality of a battery provided with such a wound electrode body is low. Therefore, it is preferable to remove these defective portions in the manufacturing process. Therefore, a defective portion removing apparatus that can remove a defective portion has been developed.

  For example, Patent Document 1 discloses a defective part removing apparatus having a detection unit that detects a defective part, a cutting mechanism that cuts the defective part, and a defective product discharge mechanism (paragraph [0014] of Patent Document 1). -See [0020] and FIG. According to Patent Document 1, a defective portion detected by a detection unit is cut by a cutting mechanism, and the cut and separated piece is cut by a defective product discharge mechanism. As a result, only the cut and separated pieces can be selectively discharged.

JP 2000-268817 A

  By the way, a battery having a large wound electrode body is mounted on a vehicle or a large machine. This is because it is necessary to supply a large amount of electric power in order to move vehicles and large machines. In a large wound electrode body, the length of the wound electrode body for winding the positive electrode plate and the negative electrode plate (winding length) is long.

  For this reason, it is conceivable to prepare and roll up a positive electrode plate and a negative electrode plate from which defective portions have been removed in advance. However, the production efficiency in that case is low. This is because the length of the original fabric is short, and the number of executions of the steps such as exchanging the original fabric and passing the paper increases. However, it is not easy to provide a mechanism for removing defective portions in the electrode winding apparatus. This is because there is not much space around the winding shaft for providing such a mechanism.

  Therefore, when the wound electrode body includes a defective portion, the wound electrode body including the defective portion is discarded. This case is shown in FIG. In FIG. 1, the wound electrode body of the Nth winding has no defective portion. Therefore, the wound electrode body of the Nth roll is a good product. The wound electrode body of the (N + 1) th winding includes a defective portion. Therefore, the wound electrode body of the (N + 1) th roll is a defective product. Therefore, the wound electrode body of the Nth winding is turned to the next process, and the wound electrode body of the (N + 1) th winding is removed from the production line. However, in this case, all of the wound electrode bodies are discarded even if there are few defective portions. In short, the yield is bad.

  The present invention has been made to solve the above-described problems of the prior art. That is, the problem is to provide an electrode winding device and a battery manufacturing method that suitably remove defective portions of the positive electrode plate and the negative electrode plate and improve the yield.

An electrode winding apparatus according to an aspect of the present invention for solving this problem includes a rotatable rotating shaft, a positive plate unwinding unit for unwinding a positive plate for winding on the rotating shaft, and a rotating shaft. A negative electrode plate unwinding section for unwinding a negative electrode plate for winding, a separator unwinding section for unwinding a separator for winding on a rotating shaft, and a control section. Moreover, it has the defect part removal part which removes a defect part from at least one of a positive electrode plate and a negative electrode plate, and the separator defect part removal part which removes the defect part of a separator . Both the defective portion removing portion and the separator defective portion removing portion are provided on the unwinding portion side of each material with respect to the rotating shaft. Then, the control unit determines that the positive electrode plate and the negative electrode are not included in any of the volume of the positive electrode plate, the volume of the negative electrode plate, and the volume of the separator that are provided for winding. A wound electrode body is manufactured by winding one turn of the plate and the separator, and at least one of the turn of the positive electrode plate and the turn of the negative electrode plate used for winding is defective. Are removed by the defective portion removing portion, and thereafter, one volume of the positive electrode plate, the negative electrode plate, and the separator is wound once. In addition to manufacturing a wound electrode body, if a defective part is included in one volume of the separator used for winding, the defective part and the front part of the defective part located in front of the defective part are indicated. After removing the defective part of the separator, the positive electrode plate, the negative electrode plate, and the separator Is intended to fabricate the electrode assembly Kai wound was submitted one volume fraction of the over data to the wound. Such an electrode winding apparatus can manufacture a wound electrode body by winding the positive electrode plate, the negative electrode plate, and the separator while removing defective portions of the positive electrode plate and the negative electrode plate. Further, as in the case where the positive electrode plate or the negative electrode plate has a defective portion, the defective portion can be removed also when the separator has a defective portion. Further, it is not necessary to provide another process for removing the defective portion. Therefore, the productivity of the wound electrode body is good. The manufactured wound electrode body contains almost no defects. In other words, the yield is good.

  The electrode winding apparatus described above may include a positive electrode plate defect portion removing unit that removes defective portions of the positive electrode plate and a negative electrode plate defect portion removing unit that removes defective portions of the negative electrode plate. Then, when the control part includes a defective part in one turn of the positive electrode plate to be wound and does not contain a defective part in one turn of the negative electrode plate, The front part of the defective part located in front thereof is removed by the defective part removing part of the positive electrode plate, and then the wound electrode body is manufactured by subjecting one turn of the positive electrode plate, the negative electrode plate and the separator to winding. In addition, when the defective portion is not included in one turn of the positive electrode plate used for winding and the defective portion is included in one turn of the negative electrode plate, the defective portion of the negative electrode plate is positioned in front of it. The defect electrode front part is removed by the defect removing part of the negative electrode plate, and then the wound electrode body is manufactured by winding one volume of the positive electrode plate, the negative electrode plate and the separator for winding. There are defects in both the volume of the positive electrode plate and the volume of the negative electrode plate In the rare case, the defective part of the positive electrode plate and the front part of the defective part located in front of the positive electrode plate are removed by the positive part of the defective part of the positive electrode plate, and the defective part of the negative electrode plate and the front part of the defective part located in front of the defective part Is removed by the negative electrode plate defect portion removing portion, and then, one volume of the positive electrode plate, the negative electrode plate, and the separator is subjected to winding to produce a wound electrode body. It is because the defective part of a positive electrode plate and the defective part of a negative electrode plate can be removed suitably.

  In the electrode winding apparatus described above, a defect portion detection unit that detects a defect portion is provided, and the defect portion removal unit has a length of the transport path from the defect portion detection unit to the defect portion removal unit. The control unit calculates the position and range of the defective portion based on the detection of the defective portion by the defective portion detecting unit. And even better. This is because the defective portion can be removed while detecting the NG mark printed on the defective portion. For this reason, it is not necessary to acquire the data of the position and range of the defective portion in advance. Further, the defective portion can be directly detected by the defective portion detecting unit and the defective portion can be removed.

  In the electrode winding apparatus described above, it is preferable to have a defective portion cutting portion that cuts a rear end portion of a defective portion or a position located downstream thereof in at least one of the positive electrode plate and the negative electrode plate. It is because a defective part can be removed reliably.

  In the electrode winding apparatus described above, the defect portion removing unit is provided at any one of a position on the transport path side for transporting the positive electrode plate or the negative electrode plate and a position other than the transport path side for transporting the positive electrode plate or the negative electrode plate. When the defective part and the front part of the defective part are to be removed and located at the position on the transport path side for transporting the positive electrode plate or the negative electrode plate, and the defective part and the front part of the defective part are removed. In cases other than the above, it is better to be located at a position other than the conveyance path side for conveying the positive electrode plate or the negative electrode plate. This is because when the defective portion is not removed, the defective portion removing portion does not need to be at the position on the transport path side. Moreover, it is because it is necessary to remove the defective part which the defective part removal part removed from the defective part removal part. This is because this operation is preferably performed at a position outside the production line.

  In the electrode winding apparatus described above, the defect portion removing unit rotates while holding any one of the positive electrode plate, the negative electrode plate, and the separator, It is good to have a holding | grip rotation part which winds up either. This is because the front part of the defective part and the defective part can be suitably wound and removed.

  In the electrode winding apparatus described above, the defect portion removing unit rotates in a state where any of the positive electrode plate, the negative electrode plate, and the separator is sucked, while the positive electrode plate, the negative electrode plate, and the separator are sucked. You may have a suction rotation part which winds up either. This is because the front part of the defective part and the defective part can be suitably wound and can be removed.

The battery manufacturing method according to another aspect of the present invention includes a positive electrode plate, a negative electrode plate, and a separator unwound while the positive electrode plate and the negative electrode plate are interposed between the separator and the rotating shaft. An electrode body manufacturing process that turns to form a wound electrode body, and a battery assembly process that places the wound electrode body inside the battery container and injects an electrolyte into the battery container and seals it. . Then, in the electrode body manufacturing process, when the defective portion is not included in any one turn of the positive electrode plate, one turn of the negative electrode plate, and one turn of the separator to be used for winding , The wound electrode body is manufactured by winding one turn of the negative electrode plate and the separator, and one turn of the positive electrode plate, one turn of the negative electrode plate, and one turn of the separator. When a defective part is included in at least one of the above, the defective part and the front part of the defective part located in front of the defective part are removed at a position closer to the unwinding position of each material than the rotation axis , and thereafter In addition, a wound electrode body is manufactured by subjecting one volume of the positive electrode plate, the negative electrode plate, and the separator to winding. In such a battery manufacturing method, a wound electrode body can be manufactured by winding the positive electrode plate, the negative electrode plate, and the separator while removing defective portions of the positive electrode plate and the negative electrode plate. Further, as in the case where the positive electrode plate or the negative electrode plate has a defective portion, the defective portion can be removed also when the separator has a defective portion. Further, it is not necessary to provide another process for removing the defective portion. Therefore, the productivity of the wound electrode body is good. The manufactured wound electrode body contains almost no defects. In other words, the battery yield is good.

  In the battery manufacturing method described above, in the electrode body manufacturing process, a defective portion is included in one turn of the positive electrode plate and a defective portion is included in one turn of the negative electrode plate. If not, the defective portion of the positive electrode plate and the front portion of the defective portion located in front of the positive electrode plate are removed, and then one turn of the positive electrode plate, the negative electrode plate, and the separator is used for winding. If a portion of the positive electrode plate used for winding does not contain a defective portion and a portion of the negative electrode plate contains a defective portion, the defective portion of the negative electrode plate and its After removing the front part of the defective part located at the front, the wound electrode body is manufactured by using one volume of the positive electrode plate, the negative electrode plate, and the separator for winding, and then used for winding. If both the volume of the positive plate and the volume of the negative plate contain defects In addition, the defective portion of the positive electrode plate and the front portion of the defective portion located in front thereof are removed, the defective portion of the negative electrode plate and the front portion of the defective portion located in front thereof are removed, and then the positive electrode plate and A wound electrode body may be manufactured by winding one volume of the negative electrode plate and the separator. It is because the defective part of a positive electrode plate and the defective part of a negative electrode plate can be removed suitably.

  In the battery manufacturing method described above, in the electrode body manufacturing process, the positive electrode plate and the negative electrode plate having a length of one or more turns for unwinding are unwound and defective portions of the positive electrode plate and the negative electrode plate are detected. Then, it is preferable to determine whether to perform winding or to remove the defective portion and to calculate the position and range of the detected defective portion. This is because the defective portion can be removed while detecting the NG mark printed on the defective portion. For this reason, it is not necessary to acquire the data of the position and range of the defective portion in advance.

  ADVANTAGE OF THE INVENTION According to this invention, the defective part of a positive electrode plate or a negative electrode plate is removed suitably, The electrode winding apparatus and the manufacturing method of a battery which aimed at the improvement of the yield are provided.

It is a conceptual diagram for demonstrating the removal method of the defect part in the conventional electrode winding apparatus. It is sectional drawing for demonstrating the structure of the battery which concerns on embodiment. It is a perspective view for demonstrating the winding electrode body of the battery which concerns on embodiment. It is an expanded view for demonstrating the winding structure of the winding electrode body in the battery which concerns on embodiment. It is a perspective sectional view showing the structure of the positive electrode plate (negative electrode plate) of the battery according to the embodiment. It is a conceptual diagram for demonstrating the removal method of the defective part in the electrode winding apparatus which concerns on embodiment. It is a schematic block diagram for demonstrating schematic structure of the electrode winding apparatus which concerns on embodiment. It is the block diagram which extracted and drawn the conveyance path | route of the positive electrode plate from the electrode winding apparatus which concerns on embodiment. It is the top view which extracted and drawn the periphery of the defective part removal apparatus in the electrode winding apparatus which concerns on embodiment. It is FIG. (1) for demonstrating a structure and operation | movement of the defect part removal apparatus in the electrode winding apparatus which concerns on embodiment. It is FIG. (2) for demonstrating a structure and operation | movement of the defect part removal apparatus in the electrode winding apparatus which concerns on embodiment. It is a front view (the 1) for demonstrating the removal of the defective part by the defective part removal apparatus in the electrode winding apparatus which concerns on embodiment. It is a front view (the 2) for demonstrating the removal of the defective part by the defective part removal apparatus in the electrode winding apparatus which concerns on embodiment. It is a front view (the 3) for demonstrating the removal of the defective part by the defective part removal apparatus in the electrode winding apparatus which concerns on embodiment. It is a front view (the 4) for demonstrating the removal of the defective part by the defective part removal apparatus in the electrode winding apparatus which concerns on embodiment. It is a front view (the 5) for demonstrating the removal of the defective part by the defective part removal apparatus in the electrode winding apparatus which concerns on embodiment. It is a front view (the 6) for demonstrating the removal of the defective part by the defective part removal apparatus in the electrode winding apparatus which concerns on embodiment. It is a front view (the 7) for demonstrating the removal of the defective part by the defective part removal apparatus in the electrode winding apparatus which concerns on embodiment. It is a front view (the 8) for demonstrating the removal of the defect part by the defect part removal apparatus in the electrode winding apparatus which concerns on embodiment. It is a flowchart which shows the flow of the process which removes the defective part in the electrode winding apparatus which concerns on embodiment. It is a schematic block diagram for demonstrating the electrode plate manufacturing apparatus used for the manufacturing method of the battery which concerns on embodiment. It is a perspective sectional view showing the positive electrode plate (negative electrode plate) in which the coating layer was formed in both sides in the manufacturing method of the battery concerning an embodiment. It is the top view which extracted and drawn the periphery of the defect part removal apparatus in another electrode winding apparatus which concerns on embodiment. It is the conceptual diagram (the 1) for demonstrating the defect part removal apparatus of another electrode winding apparatus which concerns on embodiment. It is a conceptual diagram (the 2) for demonstrating the defect part removal apparatus of another electrode winding apparatus which concerns on embodiment.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the accompanying drawings. The present embodiment embodies the present invention regarding an electrode winding apparatus and a battery manufacturing method. As a specific example, a lithium ion secondary battery will be described.

1. Battery Structure The battery according to the present embodiment is a cylindrical lithium ion secondary battery. FIG. 2 shows a cross-sectional view of the battery 10 of the present embodiment. As shown in FIG. 2, the battery 10 is sealed by a battery container including a battery container body 11 and a lid 12. The battery 10 includes a wound electrode body 100, a positive current collector 110, and a negative current collector 120. An electrolyte is injected into the battery container body 11.

  The wound electrode body 100 is a power generation element that contributes directly to power generation by repeatedly charging and discharging in the electrolytic solution. The positive electrode current collector plate 110 is a positive electrode current collector connected to a positive electrode core material of a wound electrode body 100 described later. The material is aluminum. The negative electrode current collector plate 120 is a negative electrode current collector connected to a negative electrode core material of a wound electrode body 100 described later. Its material is copper.

  FIG. 3 shows a wound electrode body 100 of the wound electrode body battery according to this embodiment. As shown in FIG. 3, the wound electrode body 100 is obtained by winding a positive electrode plate and a negative electrode plate around an axial core 101 with separators S and T sandwiched therebetween. The shaft core 101 is a member that becomes the center when the wound electrode body 100 is wound. Its shape is cylindrical. The outer diameter of the shaft core 101 is about 3 to 20 mm. However, other outer diameters may be used. Examples of the material include polyphenylene sulfide (PPS). Note that FIG. 3 shows a positive electrode non-coated portion P2 and a negative electrode non-coated portion N2 (see FIG. 4), which will be described later.

  The separators S and T are porous films such as polyethylene and polypropylene. The thicknesses of the separators S and T are about 10 to 50 μm. Here, the separator S and the separator T are made of the same material. For the understanding of the above winding order, only the codes are distinguished as S and T.

The electrolyte injected into the battery container body 11 is obtained by dissolving an electrolyte in an organic solvent. Examples of organic solvents include ester solvents such as propylene carbonate (PC), ethylene carbonate (EC), dimethyl carbonate (DMC), and ethyl methyl carbonate (EMC), and ester solvents such as γ-butyrolactone (γ-BL), di- An organic solvent containing an ether solvent such as ethoxyethane (DEE) can be used. As the electrolyte salt, lithium salts such as lithium perchlorate (LiClO ₄ ), lithium borofluoride (LiBF ₄ ), and lithium hexafluorophosphate (LiPF ₆ ) can be used.

  FIG. 4 is a development view showing a wound structure of the wound electrode body 100. As shown in FIG. 4, the wound electrode body 100 is wound in a state where a positive electrode plate P, a separator S, a negative electrode plate N, and a separator T are stacked in this order from the inside. That is, the wound electrode body 100 is configured such that the positive plates P and the negative plates N are alternately arranged with the separators S and T interposed therebetween.

The positive electrode plate P is obtained by applying a composite material containing a positive electrode active material capable of inserting and extracting lithium ions to an aluminum foil as a positive electrode core material. As the positive electrode active material, lithium composite oxides such as lithium nickelate (LiNiO ₂ ), lithium manganate (LiMnO ₂ ), and lithium cobaltate (LiCoO ₂ ) are used. The negative electrode plate N is obtained by applying a composite material containing a negative electrode active material capable of occluding and releasing lithium ions to a copper foil as a negative electrode core material. As the negative electrode active material, carbon-based materials such as amorphous carbon, non-graphitizable carbon, graphitizable carbon, and graphite are used.

  As shown in FIG. 4, the positive electrode plate P has a positive electrode coating part P1 and a positive electrode non-coating part P2. The positive electrode coating part P1 is a place where a positive electrode active material or the like is applied to the positive electrode core material. The positive electrode non-coating portion P2 is a portion where a positive electrode active material or the like is not applied to the positive electrode core material. The negative electrode plate N includes a negative electrode coating portion N1 and a negative electrode non-coating portion N2. The negative electrode coating portion N1 is a portion where a negative electrode active material or the like is applied to the negative electrode core material. The negative electrode non-coating portion N2 is a portion where a negative electrode active material or the like is not applied to the negative electrode core material.

  An arrow A in FIG. 4 indicates the width direction (vertical direction in FIG. 3) of the positive electrode plate P, the negative electrode plate N, and the separators S and T. An arrow B in FIG. 4 indicates the longitudinal direction of the positive electrode plate P, the negative electrode plate N, and the separators S and T (the circumferential direction of the wound electrode body 100 in FIG. 3).

  FIG. 5 is a perspective sectional view of the positive electrode plate P (or the negative electrode plate N). In FIG. 5, each symbol outside the parentheses indicates each part in the case of the positive electrode, and each symbol in the parenthesis indicates each part in the case of the negative electrode. The direction indicated by the arrow A in FIG. 5 is the same as the direction indicated by the arrow A in FIG. That is, it is the width direction of the positive electrode plate P. The direction indicated by arrow B in FIG. 5 is the same as the direction indicated by arrow B in FIG. That is, it is the longitudinal direction of the positive electrode plate P.

  As shown in FIG. 5, the positive electrode plate P is obtained by forming a positive electrode mixture layer PA on a part of both surfaces of a strip-like positive electrode core material PB. On the left side in FIG. 5, the positive electrode non-coated portion P2 of the positive electrode plate P protrudes in the width direction. The positive electrode non-coated portion P2 is formed in a strip shape. The positive electrode non-coated portion P2 is a region where the positive electrode active material is not applied to both surfaces of the positive electrode core material PB. Therefore, in the positive electrode non-coating portion P2, the positive electrode core material PB is still exposed. On the other hand, there is no protrusion corresponding to the positive electrode non-coated portion P2 on the right side in FIG. In the positive electrode coating part P1, the positive electrode mixture layer PA is formed with a uniform thickness on both surfaces of the positive electrode core material PB.

  As indicated by the reference numerals in parentheses in FIG. 5, the negative electrode plate N is obtained by forming a negative electrode mixture layer NA on a part of both surfaces of a strip-shaped negative electrode core material NB. On the left side in FIG. 5, a negative electrode non-coated portion N2 of the negative electrode plate N protrudes in the width direction. The negative electrode non-coated portion N2 is formed in a strip shape. The negative electrode non-coated portion N2 is a region where the negative electrode active material is not applied to both surfaces of the negative electrode core material NB. Therefore, in the negative electrode non-coating portion N2, the negative electrode core material NB is still exposed. On the other hand, there is no protrusion corresponding to the negative electrode non-coated portion N2 on the right side in FIG. In the negative electrode coating portion N1, the negative electrode mixture layer NA is formed with a uniform thickness on both surfaces of the negative electrode core material NB. However, as shown in FIG. 4, at the time of winding, the positive electrode non-coated portion P2 and the negative electrode non-coated portion N2 are wound in a state of protruding to the opposite side.

2. Defect Removal Method Here, a method for removing a defect portion when the positive electrode plate P or the negative electrode plate N has a defect portion will be described. The defect removal method described here is executed by an electrode winding apparatus. FIG. 6 is a conceptual diagram for explaining a method for removing a defective portion in the present embodiment.

  The left side of FIG. 6 shows a positive electrode plate P, a negative electrode plate N, and separators S and T that are used for winding the N-th wound electrode body 100. FIG. 6 conceptually shows the winding length (the length of one turn of the wound electrode body 100) of the positive electrode plate P, the negative electrode plate N, and the separators S and T used for winding. However, the winding length of the separators S and T is actually longer than the winding length of the positive electrode plate P and the negative electrode plate N. Therefore, the length of the positive electrode plate P and the like shown in FIG. 6 does not necessarily indicate the same length.

  As shown in FIG. 6, the wound electrode body 100 of the Nth winding does not include a defective portion. In other words, it is a good product. Then, as shown in FIG. 6, it is assumed that there is a defective portion X on the positive electrode plate P wound after the N-th wound electrode body 100 is manufactured. In this embodiment, in this case, the defective portion X and the defective portion front portion Y are removed. Here, the defective portion front portion Y is a portion located in front of the defective portion X. There is no defective portion at the defective portion front portion Y. The length of the defective portion front portion Y is shorter than the wound length (the length of one turn of the wound electrode body 100). Then, if the winding is continued after removing the defective portion X and the defective portion front portion Y, the wound electrode body 100 of the (N + 1) th winding does not include the defective portion X. That is, the wound electrode body 100 of the (N + 1) th winding is a non-defective product.

  By repeating such processing as needed, a wound electrode body that does not include the defective portion X can be manufactured. That is, the yield of the wound electrode body 100 is improved by using the electrode winding device of this embodiment. Of course, in the battery manufacturing method using the electrode winding apparatus of this embodiment, the yield of the battery is good. An electrode winding apparatus that can carry out the defect removing method described above will be described below.

3. Electrode winding device 3-1. Configuration of electrode winding device (part 1)
A schematic configuration of the electrode winding apparatus 2000 of this embodiment is shown in FIG. As shown in FIG. 7, the electrode winding apparatus 2000 is an apparatus for continuously manufacturing a wound electrode body 100 by winding a positive electrode plate P, a negative electrode plate N, and separators S and T. is there. In FIG. 7, each part of the electrode winding apparatus 2000 is drawn with a solid line, and each member used for winding is drawn with a broken line.

  As shown in FIG. 7, the electrode winding device 2000 includes a positive plate unwinding section 2001, a negative plate unwinding section 2002, separator unwinding sections 2003 and 2004, winding sections 2005a, 2005b, and 2005c, and a drive. Part 2006, positive plate cutter 2011, negative plate cutter 2012, separator cutter 2013, positive plate holding portion 2021, negative plate holding portion 2022, and pressing roller 2100.

  The positive plate unwinding unit 2001 is for unwinding the positive plate P supplied to the winding unit 2005a. The negative electrode plate unwinding part 2002 is for unwinding the negative electrode plate N supplied to the winding part 2005a. The separator unwinding parts 2003 and 2004 are for unwinding the separators S and T supplied to the winding part 2005a, respectively.

  Winding portions 2005 a, 2005 b, and 2005 c are rotation shafts for attaching the shaft core 101. Of course, the winding parts 2005a, 2005b, 2005c are rotatable. The winding portion 2005a can be rotated in the direction of arrow D in FIG. The drive unit 2006 plays the role of this rotational drive. As the drive unit 2006, for example, a servo motor can be used.

  The winding portions 2005a, 2005b, and 2005c can be rotated 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, by rotating 120 ° around the center O, the winding part 2005a moves to the position of the winding part 2005b. And the winding part 2005b moves to the position of the winding part 2005c, and the winding part 2005c moves to the position of the winding part 2005a. The drive unit 2006 also plays the role of this rotational drive.

  In addition, in the position of the winding part 2005a, the positive electrode plate P, the negative electrode plate N, and the separators S and T are actually wound. Therefore, the wound electrode body 100 is manufactured at the position of the wound portion 2005a. At the position of the wound part 2005b, the shaft core 101 of the wound electrode body 100 that has been wound is removed from the wound part 2005b. Then, the wound electrode body 100 that has been wound is transported to a place where the next step is performed. At the position of the winding part 2005c, the shaft core 101 is attached to the winding part 2005c. And prepare for a new turn.

  The positive plate cutter 2011 is for cutting the positive plate P in the width direction (the direction of arrow A in FIGS. 4 and 5). Moreover, it also serves as a defective part cutting part for cutting the defective part X and the defective part front part Y. Actually, a portion located at the rear end of the defective portion X is cut. Alternatively, a portion located slightly downstream from the rear end of the defective portion X may be cut.

  The negative plate cutter 2012 is for cutting the negative plate N in the width direction (the direction of arrow A in FIGS. 4 and 5). Moreover, it also serves as a defective part cutting part for cutting the defective part X and the defective part front part Y. Actually, a portion located at the rear end of the defective portion X is cut. Alternatively, a portion located slightly downstream from the rear end of the defective portion X may be cut.

  The separator cutter 2013 is for cutting the separators S and T at once in the width direction (direction of arrow A in FIG. 4).

  The positive plate holding part 2021 is for holding the vicinity of the tip of the positive plate P cut by the positive plate cutter 2011. 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 plate holding part 2022 is for holding the vicinity of the tip of the negative plate N cut by the negative plate cutter 2012. That is, the state in which the negative electrode plate N is gripped and the state in which the grip is released are taken.

  The pressing roller 2100 is a free roller for winding the separators S and T around the shaft core 101 attached to the winding shaft 2005a. The pressing roller 2100 may be a hollow roller or a solid roller.

  As shown in FIG. 4 and FIG. 7, the electrode winding device 2000 is a device that stacks and winds the positive electrode plate P, the separator S, the negative electrode plate N, and the separator T in this order from the inside. Therefore, the wound electrode body 100 is manufactured by rotating the wound portion 2005a in the direction of the arrow D in FIG.

3-2. Configuration of electrode winding device (2)
In addition, as shown in FIG. 7, the electrode winding apparatus 2000 includes a defective portion sensor 2211, a defective portion removing device 2221, a defective portion sensor 2212, and a defective portion removing device 2222. A control unit 2500 is provided.

  The defective part sensor 2211 is a defective part detection unit for detecting whether or not the positive electrode plate P unwound from the positive electrode plate unwinding part 2001 has a defective part. Here, the defective portion sensor 2211 reads the NG mark printed on the positive electrode plate P. If there is a defective portion, the position and range of the NG mark are also detected. The defective portion removing device 2221 is a positive plate defect portion removing unit for removing the defective portion X of the positive plate P detected by the defective portion sensor 2211.

  The defect portion sensor 2212 is a defect portion detection unit for detecting whether or not the negative electrode plate N unwound from the negative electrode plate unwinding portion 2002 has a defect portion. Here, the defective portion sensor 2212 reads the NG mark printed on the negative electrode plate N. If there is a defective portion, the position and range of the NG mark are also detected. The defective part removing device 2222 is a negative electrode plate defect part removing unit for removing the defective part X of the negative electrode plate N detected by the defective part sensor 2212.

  The control unit 2500 controls the operation of each unit of the electrode winding device 2000. Of course, each part is also controlled when the defect removal method according to the present embodiment is carried out.

3-3. Configuration of electrode winding device (part 3)
FIG. 8 is a configuration diagram in which only the transport path of the positive electrode plate P is extracted from FIG. FIG. 8 also shows each part that is omitted in FIG. 8, in addition to the components shown in FIG. 7, the ionizer 2051, the EPC lever 2053, the EPC sensor 2054, the dancer roll 2055, and the electrostatic sensor 2056 are depicted as components of the electrode winding device 2000. ing.

  The ionizer 2051 is for removing static electricity from the positive electrode plate P. The EPC lever 2053 is a lever used to control the position of the end of the positive electrode plate P in the width direction. A cylinder or the like may be used to operate the EPC lever 2053. The dancer roll 2055 is for adjusting the tension of the positive electrode plate P. The dancer roll 2055 can move in the direction of arrow G in FIG. Depending on the position of the dancer roll 2055, the tension of the positive electrode plate P changes.

  Here, the conveyance path of the positive electrode plate P from the position where the defective portion sensor 2211 is disposed to the position where the positive plate cutter 2011 is disposed is referred to as a “pass line”. The length of this pass line is called “pass line length”. In FIG. 8, the pass line is drawn with a bold line. In this embodiment, the pass line length of the positive electrode plate P is longer than the length of the positive electrode plate P used for one turn of the wound electrode body 100. Therefore, the positive electrode plate P located on the pass line has already been detected for the presence, position and range of the defective portion.

4). FIG. 9 is a plan view showing the periphery of the defective portion removing device 2221 in the electrode winding device 2000. FIG. In FIG. 9, the positive electrode plate P to be conveyed is indicated by a broken line. As shown in FIG. 9, the defective portion removing device 2221 can be positioned on the conveyance path side (line side) of the positive electrode plate P and on the back side of the electrode winding device 2000 with the wall 2300 interposed therebetween. Yes. That is, the defective part removing device 2221 moves in the direction of the arrow H1 in FIG. As this moving mechanism, a known slide mechanism such as a cylinder or a ball screw may be used. The defective part removing device 2221 is normally located at a position behind the electrode winding device 2000 (two-dot chain line in FIG. 9). And when removing the defective part X from the positive electrode plate P, it is located in the position by the side of the conveyance path | route of the positive electrode plate P (solid line of FIG. 9).

  The configuration of the defective portion removing apparatus 2221 will be described with reference to FIGS. 10 and 11 are views of the defective portion removing device 2221 extracted from the front. The defective portion removing device 2221 has core materials 2221a and 2221b. Both the core material 2221a and the core material 2221b have a semi-cylindrical shape in which a cylinder is divided in half by a plane passing through the central axis.

  The core material 2221a and the core material 2221b can take the open state shown in FIG. 10 and the closed state shown in FIG. Therefore, when the defective part removing device 2221 shifts from the open state to the closed state, the core member 2221a and the core member 2221b move so as to sandwich the positive electrode plate P from above and below. That is, the core material 2221a moves in the direction of the arrow I1 in FIG. 11, and the core material 2221b moves in the direction of the arrow I2 in FIG. The core members 2221a and 2221b can grip the positive electrode plate P when the core members 2221a and 2221b are closed. Further, the core members 2221a and 2221b are rotation gripping portions that can rotate while the positive electrode plate P is gripped. Therefore, the core members 2221a and 2221b can wind up the defect portion X and the defect portion front portion Y of the positive electrode plate P.

5. Defect Part Removal Procedure Next, a specific defect part removal procedure in the electrode winding apparatus 2000 will be described with reference to FIGS. Here, as shown in FIG. 6, the case where the defective portion X exists in the positive electrode plate P supplied to the winding shaft 2005a after the N-th wound electrode body 100 is manufactured will be described. In this case, the defective portion removing device 2221 removes the defective portion X and the defective portion front portion Y of the positive electrode plate P as described above. The procedure is shown below.

  FIG. 12 is a conceptual diagram of the periphery of the defective portion removing device 2221 viewed from the front immediately after the N-th wound electrode body 100 is manufactured. In FIG. 12, the positive electrode plate gripping portion 2021 sandwiches the defective portion front portion Y. At this time, the defective portion removing device 2221 is located on the back side of the electrode winding device 2000 (the position of the two-dot chain line in FIG. 9).

  Next, the positive electrode plate gripper 2021 moves in the direction of the arrow J1 in FIG. Further, the positive electrode plate P is sent out in the direction of the arrow J2 in FIG. Then, the defective portion removing device 2221 is moved from the back side of the electrode winding device 2000 to the transport path side (line side) of the positive electrode plate P. At that time, the core members 2221a and 2221b are in an open state. Therefore, the defective portion front portion Y enters a gap between the core material 2221a and the core material 2221b. That is, there is no possibility of contacting the core materials 2221a and 2221b.

  Next, as shown in FIG. 14, the core members 2221a and 2221b move in the direction of the arrow J3 in FIG. Then, the core materials 2221a and 2221b grip the defective portion front portion Y. Here, L1 in FIG. 14 indicates the distance from the position of the front end of the defective portion front portion Y to the position of the rear end gripped by the defective portion removing device 2221.

  Next, as shown in FIG. 15, the core members 2221a and 2221b start to rotate in the direction of the arrow J4 in FIG. Therefore, the defective portion front portion Y of the positive electrode plate P is wound around the core materials 2221a and 2221b. Subsequently, the defective portion X of the positive electrode plate P is wound around the core materials 2221a and 2221b. As a result, the defective portion front portion Y and the defective portion X are wound around the core material 2221a and the core material 2221b. Here, L2 in FIG. 15 indicates the remaining portion of the defective portion X wound around the defective portion removing device 2221. That is, the distance from the position of the left end of the defective part removing device 2221 to the position of the positive plate cutter 2011 is shown.

  Then, when the rear end of the defective portion X comes to a position downstream of the position of the positive plate cutter 2011, the rotation of the core materials 2221a and 2221b is stopped. And as shown in FIG. 16, the positive electrode plate holding | gripping part 2021 moves to the direction of arrow J5 in FIG. Then, the positive electrode plate P is gripped. Next, the positive plate cutter 2011 cuts the positive plate P. At this time, the positive electrode plate P located on the pass line has no defective portion.

  Next, as shown in FIG. 17, the core members 2221a and 2221b rotate in the direction of the arrow J7 in FIG. As a result, the remainder of the defective portion X that has not yet been wound around the core materials 2221a and 2221b is wound up.

  Next, as shown in FIG. 18, the defective portion removing device 2221 is retracted from the transport path side (line side) of the positive electrode plate P to the back side of the electrode winding device 2000. Thereby, the defective part X and the defective part front location Y of the positive electrode plate P were removed from the production line. Then, as shown in FIG. 19, the positive electrode plate P may be continuously supplied to the winding shaft 2005a. Thereby, the wound electrode body 100 of the (N + 1) th winding does not include the defect portion X.

  As described above, when removing the defective portion X and the defective portion forward portion Y, the defective portion removing device 2221 is positioned at the position on the transport path side (line side) for transporting the positive electrode plate P, and other than that. In this case, the electrode winding device 2000 is located on the back side. It should be noted that the defective portion X and the defective portion front portion Y wound up by the defective portion removing device 2221 can be removed from the defective portion removing device 2221 when the defective portion removing device 2221 is located on the back side of the electrode winding device 2000. That's fine. This is to prevent foreign matter from being removed from entering the wound electrode body 100. Moreover, it is for preparing for the removal of the next defective part.

Further, the length LXY of the defective portion X and the defective portion forward portion Y taken up by the defective portion removing device 2221 is as follows.
LXY = L1 + L2 + L3 × R
L1: Distance from the position of the leading end of the defective portion front portion Y to the position of the rear end gripped by the defective portion removing device 2221
L2: Distance from the position of the left end of the defective portion removing device 2221 to the position of the positive plate cutter 2011
L3: Perimeter of the defective part removing device 2221
R: Rotation speed of the defective part removing device 2221

  The case where the defective portion X of the positive electrode plate P is removed has been described above as an example. However, the same can be performed when the defective portion of the negative electrode plate N is removed.

6). Control flow of electrode winding device 6-1. Control Flow Here, the control flow of the electrode winding apparatus 2000 will be described with reference to the flowchart of FIG. First, it is detected whether the positive electrode plate P and the negative electrode plate N have a defective portion (S101). That is, the positive electrode plate P and the negative electrode plate N having a length of one turn or more are unwound, and the presence or absence and position of a defective portion of the positive electrode plate P and the negative electrode plate N are detected. Here, if it is before manufacture of the winding electrode body 100 of the 1st volume, it detects, conveying the positive electrode plate P and the negative electrode plate N to a pass line. If the wound electrode body 100 of the first volume is manufactured, the defective portions of the positive electrode plate P and the negative electrode plate N in the pass line have already been detected when the immediately previous wound electrode body 100 is manufactured.

  Next, it is determined whether or not there is a defective portion in the positive electrode plate P or the negative electrode plate N of the pass line (S102). That is, it is determined whether to perform winding or to remove the defective portion. If there is a defect in either the positive plate P or the negative plate N of the pass line (S102: Yes), the process proceeds to S103. If there is no defect in either the positive electrode plate P or the negative electrode plate N (S102: No), the process proceeds to S106.

  The defective portion X is removed by the processing from S103 to S105. In S103, the position of the defective part is stored. The storage location is another storage unit (not shown). Next, the position and range (length) of the removed portion (defect portion X and defect portion forward portion Y) are calculated (S104). Specifically, the control unit 2500 obtains the position of the front end of the defective part front portion Y and the position of the rear end of the defective part X by calculation based on the detection of the defective part by the defective part sensors 2211 and 2122.

  Subsequently, the defective portion discharge devices 2221 and 2222 remove the defective portion front portion Y and the defective portion X in the above-described procedure (S105). The cutting position here is the position of the rear end of the defective portion X. Alternatively, the position may be slightly downstream from the rear end of the defective portion X.

  In S106, the positive electrode plate P and the negative electrode plate N in the pass line, and the separators S and T are wound, and the wound electrode body 100 is manufactured. The wound electrode body 100 does not include a defective portion. Thus, the wound electrode body 100 is manufactured.

6-2. When no defective portion is included As described above, the electrode winding apparatus 2000 according to the present embodiment has one turn of the positive electrode plate P used for winding and one turn of the negative electrode plate N used for winding. When the defect portion X is not included in any of the minutes, the wound electrode body 100 is manufactured as it is. That is, one volume of the positive electrode plate P, the negative electrode plate N, and the separators S and T is wound.

6-3. When a defective portion is included On the other hand, a defective portion X is included in at least one of one turn of the positive electrode plate P provided for winding and one turn of the negative electrode plate N provided for winding. If there is, the defective portion front portion Y and the defective portion X are removed. For this purpose, the defect portion removing apparatuses 2221 and 2222 may be used. And the winding electrode body 100 is manufactured after the removal. That is, one volume of the positive electrode plate P, the negative electrode plate N, and the separators S and T is wound.

  Here, the case where the defective part X is contained only in the positive electrode plate P is demonstrated. If the winding portion of the positive electrode plate P used for winding contains a defective portion and the winding portion of the negative electrode plate N used for winding does not contain a defective portion, the positive electrode plate P The defective portion front portion Y and the defective portion X are removed. For this, a defective portion removing device 2221 may be used. And the winding electrode body 100 is manufactured after the removal.

  Here, a case where the defect portion X is included only in the negative electrode plate N will be described. When the winding portion of the positive electrode plate P used for winding does not include a defective portion and the winding portion of the negative electrode plate N used for winding includes a defective portion, the negative electrode plate N defective portion front portion Y and defective portion X are removed. For this, a defective portion removing device 2222 may be used. And the winding electrode body 100 is manufactured after the removal.

  Here, the case where the defective part X is contained in both the positive electrode plate P and the negative electrode plate N is demonstrated. In this case, the defect portion front portion Y and the defect portion X of the positive electrode plate P are removed, and the defect portion front portion Y and the defect portion X of the negative electrode plate N are removed. The order of removing these may be performed first. Of course, it may be simultaneous. And the winding electrode body 100 is manufactured after the removal.

7). Battery Manufacturing Method A battery manufacturing method including the wound electrode body 100 according to the present embodiment is characterized in that the electrode winding device 2000 is used for winding the positive electrode plate P, the negative electrode plate N, and the separators S and T. There is something.

7-1. Electrode plate manufacturing process The positive electrode plate P and the negative electrode plate N are manufactured using the electrode plate manufacturing apparatus 1000 shown in FIG. The manufacturing process is common to the positive electrode plate P and the negative electrode plate N. Therefore, the manufacturing process of the positive electrode plate P will be described as a representative. First, the coating process will be described. The positive electrode core material PB is sent out from the unwinding shaft 1101. Next, the positive electrode paste is applied to the positive electrode core material PB with a predetermined width and thickness by the coating liquid supply unit 1210. Thereby, the paste layer of the positive electrode is applied on the positive electrode core material PB.

  Next, the drying process will be described. In the drying process, the coated positive electrode core material PB is conveyed into the drying furnace 1300. Inside the drying furnace 1300, the positive electrode core material PB is conveyed while being supported by the roller 1302. Then, the paste layer on the positive electrode core material PB is dried by hot air blown from the air nozzle 1301. After this drying, the positive electrode mixture layer PA is formed on one surface of the positive electrode core material PB. The positive electrode core material PB on which the positive electrode mixture layer PA is formed on one surface is wound around the winding shaft 1401.

  The electrode plate manufacturing apparatus 1000 shown in FIG. 21 is an apparatus that forms a coating layer only on one side of an electrode core material. Therefore, in order to apply both surfaces, after forming the positive electrode mixture layer PA on one surface, the positive electrode mixture layer PA may be formed on the opposite surface. Therefore, the positive electrode core material PB is passed through the electrode plate manufacturing apparatus 1000 twice. However, if an electrode plate manufacturing apparatus that coats and dries both sides instead of the electrode plate manufacturing apparatus 1000 of FIG. 21 is used, the number of times that the positive electrode core material PB is passed through the electrode plate manufacturing apparatus may be one. The electrode plate manufacturing apparatus that coats and dries both surfaces has a coating liquid supply unit that coats the surface opposite to the coating surface downstream of the drying furnace 1300 in FIG. 21, and a drying furnace downstream thereof.

  Similarly, the negative electrode plate N can be coated on both sides. That is, the negative electrode core material NB is unwound, the paste is applied by the coating liquid supply unit 1210, and the paste layer is dried inside the drying furnace 1300. However, the coating liquid supplied from the coating liquid supply unit 1210 is for the negative electrode. Further, the drying conditions such as the temperature of the drying furnace 1300 may be different from those of the positive electrode. Note that the order of manufacturing the positive electrode plate P and the negative electrode plate N may be either.

  The positive electrode plate PX and the negative electrode plate NX thus formed are shown in FIG. If the positive electrode plate PX and the negative electrode plate NX are slit along the line L in FIG. 22, the positive electrode plate P and the negative electrode plate N shown in FIG.

7-2. Electrode Body Manufacturing Step Subsequently, the wound electrode body 100 is manufactured using the electrode winding apparatus 2000 shown in FIG. At that time, the positive electrode plate P and the negative electrode plate N are wound with separators S and T interposed therebetween. When there is no defect in the positive electrode plate P and the negative electrode plate N located on the pass line, the wound electrode body 100 is manufactured as it is. If the positive electrode plate P or the negative electrode plate N located on the pass line has a defective portion, the defective portion is removed using the defective portion removing devices 2221 and 2222 as described above. Then, the wound electrode body 100 is manufactured.

7-3. Battery Assembly Step Subsequently, the wound electrode body 100 is disposed inside the battery container body 11. Then, an electrolytic solution is injected into the battery container body 11. The lid 12 is then sealed. Thereby, the battery 10 of this embodiment is assembled. After this, it is advisable to perform processing such as conditioning and aging and various inspection processes. The battery 10 of this embodiment is manufactured through the above steps.

  As described above in detail, in the battery manufacturing method of this embodiment, the wound electrode body 100 is manufactured by winding the positive electrode plate P and the negative electrode plate N from which the defective portion has been removed. Therefore, there is almost no possibility that the manufactured wound electrode body 100 includes a defective portion. Therefore, the performance of the battery manufactured by the manufacturing method is good.

8). Modification 8-1. In this embodiment, as shown in FIG. 9, the defective part removing device 2221 is retracted to the back side of the electrode winding device 2000, that is, the position sandwiching the wall 2300. However, as shown in FIG. 23, the defective portion removing device 2221 may be retracted to a position opposite to the wall 2300 in the electrode winding device 2000. Even if it does in this way, it is because it does not change that a defective part can be removed suitably.

8-2. In this embodiment, the defect portion X and the defect portion front portion Y are wound around the defect portion removal apparatus 2221 by sandwiching the positive electrode plate P and the negative electrode plate N between the core materials 2221a and 2221b. It was decided. However, other methods may be adopted as a method for removing the defective portion X and the like. For example, as shown in FIG. 24, a suction roller 3211 including a roller portion 3211a and a suction portion 3211b may be used. The suction roller 3211 is a gripping rotation unit. In this case, the suction part 3211b sucks the defective portion forward portion Y (possibly defective portion X) of the positive electrode plate P or the negative electrode plate N. The suction roller 3211 rotates in the sucked state. As a result, the defective portion X and the defective portion front portion Y of the positive electrode plate P and the negative electrode plate N are wound up.

  Further, as shown in FIG. 25, core members 4211a and 4211b that do not hold the positive electrode plate P or the like may be used. Even in this case, the defect portion X and the defect portion front portion Y can be wound up. Further, as long as the positive electrode plate P having a predetermined length can be removed from the line of the electrode winding device 2000, a method other than the winding method may be used.

8-3. In the present embodiment, when the positive electrode plate P and the negative electrode plate N have defective portions, the defective portions are removed. However, the separators S and T may have a defective portion. In that case, the defective portion can be removed in the same manner. For this purpose, the electrode winding device is provided with a defective portion sensor for the separators S and T and a defective portion removing device. As a defective portion removing apparatus for separators is a separator defective portion removing section.

8-4. In this embodiment, an NG mark is attached to the defective portion X. However, the defect portion sensors 2211 and 2122 may actually detect whether or not the positive electrode plate P or the negative electrode plate N has a defect portion. At that time, of course, the position and range of the defective portion are also detected. The defect part removing devices 2221 and 2222 can still remove the defect part X and the defect part front part Y from the positive electrode plate P and the negative electrode plate N.

8-5. When not providing a defective part sensor It is good also as not providing the defective part sensor 2211,2122. The fabric of the positive electrode plate P and the fabric of the negative electrode plate N from which the defective portion X has been detected in advance are prepared. This is because if the position and range of the defective portion X are converted into data, the defective portion X can be removed based on the data. This data conversion may be performed in a process prior to winding. In that case, a defective part sensor is not necessary. The length from the unwinding of the positive electrode plate P etc. to the positive electrode plate cutter 2011 may be shorter than the length of one turn wound around the wound electrode body 100. The same applies to the negative electrode plate N side.

8-6. When there are a plurality of defect portions When there are a plurality of defect portions X in the positive electrode plate P and the negative electrode plate N in the pass line, the defect located at the most downstream in the pass line from the tip of the defect portion front portion Y What is necessary is just to remove from the electrode winding apparatus 2000 to the rear end of the part X. This is because this does not change that the wound electrode body 100 wound immediately after that does not include the defect portion X.

  Also, 8-1. To 8-6. The modifications described above may be combined with each other. By combining these, the effects of each modification are added in a superimposed manner.

9. Summary As described above in detail, the electrode winding apparatus 2000 according to the present embodiment includes the defect portion removing apparatuses 2221 and 2222. The defective portion removing devices 2221 and 2222 are for removing the defective portion X and the defective portion forward portion Y. Therefore, the wound electrode body 100 can be manufactured from the positive electrode plate P and the negative electrode plate N after the defect portion X is removed. Thereby, the electrode winding apparatus 2000 which can manufacture the winding electrode body 100 which does not contain the defective part X is implement | achieved.

  Further, in the battery manufacturing method according to the present embodiment, the wound electrode body 100 can be manufactured by winding the positive electrode plate P and the negative electrode plate N after the defective portion X is removed. That is, there is almost no risk of producing a defective wound electrode body. Therefore, the yield of the batteries manufactured by the battery manufacturing method of this embodiment is good.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, it is not limited to a cylindrical battery. A battery using a wound electrode body can be similarly applied. For example, the present invention can also be applied to a rectangular battery having a flat wound electrode body manufactured by flat pressing the wound electrode body. In this embodiment, the axial core 101 remains on the wound electrode body 100 even after the wound electrode body 100 is manufactured. However, the shaft core 101 may be removed from the wound electrode body 100 after winding.

  Moreover, it is not restricted to a lithium ion secondary battery. The present invention can also be applied to nickel metal hydride batteries and other secondary batteries. Moreover, if it is a battery, it can apply not only to a secondary battery but to a primary battery.

DESCRIPTION OF SYMBOLS 10 ... Battery 11 ... Battery container main body 12 ... Cover 100 ... Winding electrode body 101 ... Axle core 1000 ... Electrode plate manufacturing apparatus 2000 ... Electrode winding apparatus 2001 ... Positive electrode plate unwinding part 2002 ... Negative electrode plate unwinding part 2003, 2004 ... separator unwinding parts 2005a, 2005b, 2005c ... winding part 2006 ... drive part 2011 ... positive electrode plate cutter 2012 ... negative electrode plate cutter 2013 ... separator cutter 2021 ... positive electrode plate gripping part 2022 ... negative electrode plate gripping part 2211, 2122. ... defective portion sensors 2221, 2222 ... defective portion removing devices 2221a, 2221b ... core material 2100 ... pressure roller 2500 ... control part P, PX ... positive electrode plate PA ... positive electrode mixture layer PB ... positive electrode core material P1 ... positive electrode coating part P2 ... Non-coated portion N, NX ... Negative plate NA ... Negative electrode mixture layer NB ... Negative electrode core material N1 ... Negative electrode coating N2 ... the negative electrode non-coated portion S, T ... separator

Claims (10)

A rotatable axis of rotation;
A positive plate unwinding section for unwinding a positive plate for winding around the rotating shaft;
A negative electrode plate unwinding section for unwinding a negative electrode plate for winding on the rotating shaft;
A separator unwinding section for unwinding a separator for winding on the rotating shaft;
An electrode winding device having a control unit,
A defective portion removing portion for removing the defective portion from at least one of the positive electrode plate and the negative electrode plate ;
A separator defective portion removing section for removing a defective portion of the separator ,
The defect part removal part and the separator defect part removal part are both provided on the unwinding part side of each material from the rotating shaft,
The controller is
When a defect portion is not included in one turn of the positive electrode plate, one turn of the negative electrode plate, and one turn of the separator that are subjected to winding,
A volume of the positive electrode plate, the negative electrode plate and the separator is subjected to winding to produce a wound electrode body,
When a defective part is included in at least one of the volume of the positive electrode plate and the volume of the negative electrode plate used for winding,
The defective portion and the defective portion front portion located in front of the defective portion are removed by the defective portion removing section,
After that, a wound electrode body is manufactured by subjecting one volume of the positive electrode plate, the negative electrode plate, and the separator to winding .
When a part of the separator used for winding contains a defective part,
Removing the defective portion and the defective front portion located in front of the defective portion by the separator defective portion removing section,
Thereafter, a wound electrode body is manufactured by subjecting one volume of the positive electrode plate, the negative electrode plate, and the separator to winding . The electrode winding device according to claim 1,
A positive electrode plate defect portion removing section for removing a defective portion of the positive electrode plate;
A negative electrode plate defect portion removing portion for removing a defective portion of the negative electrode plate,
The controller is
When a part of the positive electrode plate used for winding contains a defective part and a part of the negative electrode plate does not contain a defective part,
The defective portion of the positive electrode plate and the front portion of the defective portion located in front thereof are removed by the positive electrode plate defective portion removing section,
After that, one volume of the positive electrode plate, the negative electrode plate, and the separator is used for winding, and a wound electrode body is manufactured.
When a portion of the positive electrode plate used for winding does not contain a defective portion and a portion of the negative electrode plate contains a defective portion,
The defect portion of the negative electrode plate and the defect front portion located in front of the negative electrode plate are removed by the negative electrode plate defect portion removing portion,
After that, one volume of the positive electrode plate, the negative electrode plate, and the separator is used for winding, and a wound electrode body is manufactured.
If there is a defect in both the volume of the positive electrode plate and the volume of the negative electrode plate that are subjected to winding,
The defective portion of the positive electrode plate and the front portion of the defective portion located in front thereof are removed by the positive electrode plate defective portion removing section,
The defect portion of the negative electrode plate and the defect front portion located in front of the negative electrode plate are removed by the negative electrode plate defect portion removing portion,
Thereafter, a wound electrode body is manufactured by subjecting one volume of the positive electrode plate, the negative electrode plate, and the separator to winding. The electrode winding device according to claim 1 or 2, wherein
It has a defective part detection part that detects a defective part,
The defective part removing portion is
The length of the transport path from the defective part detection unit to the defective part removal unit is arranged at a position that is longer than the winding length of one winding electrode body,
The controller is
An electrode winding apparatus, wherein a position and a range of a defective portion are calculated based on detection of a defective portion by the defective portion detecting unit. An electrode winding device according to any one of claims 1 to 3,
An electrode winding apparatus comprising: a defective portion cutting portion that cuts a rear end portion of a defective portion in at least one of a positive electrode plate and a negative electrode plate or a portion located downstream thereof. An electrode winding apparatus according to any one of claims 1 to 4, wherein
The defective part removing portion is
A position on the transport path side for transporting the positive electrode plate or the negative electrode plate;
It is arranged at any position other than the transport path side for transporting the positive electrode plate or the negative electrode plate,
When removing the defective part and the front part of the defective part,
Located at the position on the transport path side for transporting the positive or negative plate,
In cases other than removing the defective part and the front part of the defective part,
An electrode winding apparatus, wherein the electrode winding apparatus is located at a position other than a transport path side for transporting a positive electrode plate or a negative electrode plate. An electrode winding device according to any one of claims 1 to 5 ,
The defective part removing portion is
It has a gripping rotating portion that rotates while gripping any one of the positive electrode plate, the negative electrode plate, and the separator, and winds up any of the gripping positive electrode plate, negative electrode plate, and separator. An electrode winding device. An electrode winding device according to any one of claims 1 to 5 ,
The defective part removing portion is
It has a suction rotating part that winds up any one of the positive electrode plate, the negative electrode plate, and the separator that rotates while rotating in a state where any of the positive electrode plate, the negative electrode plate, and the separator is sucked. An electrode winding device. An electrode body manufacturing process in which a positive electrode plate, a negative electrode plate, and a separator are unwound, and the positive electrode plate and the negative electrode plate are wound around a rotating shaft with a separator interposed therebetween to form a wound electrode body;
A battery assembly process comprising: arranging a wound electrode body inside a battery container and injecting an electrolyte into the battery container and sealing the battery assembly;
In the electrode body manufacturing process,
When a defect portion is not included in one turn of the positive electrode plate, one turn of the negative electrode plate, and one turn of the separator that are subjected to winding,
A volume of the positive electrode plate, the negative electrode plate and the separator is subjected to winding to produce a wound electrode body,
When a defective part is included in at least one of the volume of the positive electrode plate, the volume of the negative electrode plate, and the volume of the separator that are subjected to winding,
Removing the defective part and the front part of the defective part located in front of the defective part at a position closer to the unwinding position of each material than the rotating shaft ;
Thereafter, a wound electrode body is manufactured by subjecting one volume of the positive electrode plate, the negative electrode plate, and the separator to winding. A method of manufacturing a battery according to claim 8 ,
In the electrode body manufacturing process,
When a part of the positive electrode plate used for winding contains a defective part and a part of the negative electrode plate does not contain a defective part,
Remove the defective part of the positive electrode plate and the front part of the defective part located in front of it,
After that, one volume of the positive electrode plate, the negative electrode plate, and the separator is used for winding, and a wound electrode body is manufactured.
When a portion of the positive electrode plate used for winding does not contain a defective portion and a portion of the negative electrode plate contains a defective portion,
Remove the defective part of the negative electrode plate and the front part of the defective part located in front of it,
After that, one volume of the positive electrode plate, the negative electrode plate, and the separator is used for winding, and a wound electrode body is manufactured.
If there is a defect in both the volume of the positive electrode plate and the volume of the negative electrode plate that are subjected to winding,
Remove the defective part of the positive electrode plate and the front part of the defective part located in front of it,
Remove the defective part of the negative electrode plate and the front part of the defective part located in front of it,
Thereafter, a wound electrode body is manufactured by subjecting one volume of the positive electrode plate, the negative electrode plate, and the separator to winding. A method of manufacturing a battery according to claim 8 or claim 9 ,
In the electrode body manufacturing process,
Unwind the positive electrode plate and negative electrode plate that are longer than one turn for winding, and detect the defective part of the positive electrode plate and negative electrode plate.
A battery manufacturing method characterized by determining whether to perform winding or removing a defective portion and calculating a position and a range of the detected defective portion.

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