Method for decomposing electrode body and apparatus for decomposing electrode body

Abstract

The present invention relates to a method of disassembling an electrode body and a device for disassembling an electrode body. In the disassembly of a wound electrode body, a portion that is difficult to unwind is more smoothly unwound. A method of disassembling an electrode body (1) includes: a preparation step (S10) in which an electrode body (1) in which a first separator (2) in a band shape, a negative electrode (3) in a band shape, a second separator (4) in a band shape, and a positive electrode (5) in a band shape are sequentially stacked and wound in a prescribed winding direction is prepared; a first separation step (S20) in which the electrode body (1) is separated into the first separator and the negative electrode and the second separator and the positive electrode at a winding end portion of the electrode body (1); and an unwinding step (S50-S240) in which the electrode body is unwound by stretching the first separator and the second separator, respectively. The unwinding step (S50-S240) includes winding an unwound portion (1A) of the electrode body on a roller (153) that bends a conveying direction of the wound sheet.

Description

Technical Field

[0001] This invention relates to a method for disassembling an electrode and an apparatus for disassembling an electrode. Background Technology

[0002] For example, Japanese Patent Application Publication No. 2013-004299 discloses a method for recycling lithium-ion secondary batteries. According to this publication, the lithium-ion secondary battery includes a wound body constructed by layering and winding a positive electrode made of aluminum foil coated with active material and a negative electrode made of copper foil coated with active material, separated by a separator made of plastic foil. In the lithium-ion secondary battery disclosed in Japanese Patent Application Publication No. 2013-004299, the wound body and non-aqueous electrolyte are contained in a stainless steel container and sealed. Japanese Patent Application Publication No. 2013-004299 also discloses a method in which a lithium-ion secondary battery, after pretreatment such as discharging and cleaning, is fed into a crusher for crushing, and the various materials of the crushed lithium-ion secondary battery are screened and recycled using wind screening and a two-stage sieve.

[0003] For example, Japanese Patent Application Publication No. 2007-165136 discloses a winding assembly dismantling device configured to sort and recycle the positive and negative electrodes of a wound electrode assembly for a cylindrical lithium secondary battery. According to Japanese Patent Application Publication No. 2007-165136, the efficient use of resources is related to the reuse of electrode materials from discarded lithium secondary batteries as battery materials, and therefore requires refining the electrode materials to a high purity. According to Japanese Patent Application Publication No. 2007-165136, in order to refine the electrode materials to a high purity, it is first necessary to simplify the process of sorting the positive and negative electrodes, which use rare resources.

[0004] Japanese Patent Application Publication No. 2007-165136 discloses a winding assembly disassembly device, which includes: an unwinding roller supporting a winding electrode assembly for rotation; a clamping roller for unwinding the positive electrode, negative electrode, and diaphragm from the winding electrode assembly supported by the unwinding roller; and winding rollers for winding the positive electrode, negative electrode, and diaphragm respectively. According to Japanese Patent Application Publication No. 2007-165136, when the winding electrode assembly is installed in the winding assembly disassembly device, the operator manually pulls out the laminate of the positive electrode, negative electrode, and diaphragm from the winding electrode assembly and clamps the laminate using the clamping rollers. Then, the operator separates the negative electrode, diaphragm A, positive electrode, and diaphragm B from the position of the clamping rollers and installs them onto their respective winding rollers.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2013-004299

[0008] Patent Document 2: Japanese Patent Application Publication No. 2007-165136 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] As a method for disassembling an electrode body formed by sequentially stacking and winding a strip-shaped first diaphragm, negative electrode, second diaphragm, and positive electrode, the inventors of this application devised the following method: at the end of the winding of the electrode body, the electrode body is separated into a first diaphragm and negative electrode and a second diaphragm and positive electrode, and the electrode body is unwound by stretching the first diaphragm and the second diaphragm respectively. When disassembling the electrode body using the above method, the inventors of this application found that the electrode body is difficult to unwind in the final stage of unwinding.

[0011] Here, a method for disassembling an electrode body is proposed, which separates the electrode body into a first diaphragm and a negative electrode, and a second diaphragm and a positive electrode. The electrode body is unwound by stretching the first diaphragm and the second diaphragm respectively, thereby disassembling the electrode body. This disassembly method can more easily unwound the difficult-to-unwound parts of the electrode body. In addition, an electrode body disassembly apparatus is proposed, which can more easily unwound the difficult-to-unwound parts of the electrode body.

[0012] Methods for solving problems

[0013] The proposed method for disassembling the electrode body includes: a preparation step, in which an electrode body is prepared by sequentially stacking and winding a strip-shaped first diaphragm, a strip-shaped negative electrode, a strip-shaped second diaphragm, and a strip-shaped positive electrode along a predetermined winding direction; a first separation step, in which the electrode body is separated into the first diaphragm and the negative electrode, and the second diaphragm and the positive electrode at the end of the winding; and an unwinding step, in which the electrode body is unwound by stretching the first diaphragm and the second diaphragm respectively. The unwinding step includes winding the unwound portion of the electrode body onto a roller that bends the conveying direction of the wound sheet.

[0014] According to the inventors of this application, the main reason why it is difficult to separate the laminated sheets of the first diaphragm and the negative electrode from the laminated sheets of the second diaphragm and the positive electrode in the final stage of the unwinding process is that when unwinding near the innermost circumference of the electrode body, the force line of the force stretching the first diaphragm roughly overlaps with the force line of the force stretching the second diaphragm, making it difficult for the force of rotation of the electrode body to take effect. According to the above-described method of disassembling the electrode body, by winding the unwound portion of the electrode body onto a roller, it is possible to make the force line of the force stretching the first diaphragm non-parallel to the force line of the force stretching the second diaphragm. This generates a force that causes the electrode body to rotate. Therefore, it is possible to unwind difficult-to-unwind portions, such as near the innermost circumference of the electrode body, more smoothly.

[0015] The electrode body disassembly apparatus proposed herein is an apparatus for disassembling an electrode body formed by sequentially stacking and winding a strip-shaped first diaphragm, a strip-shaped negative electrode, a strip-shaped second diaphragm, and a strip-shaped positive electrode along a predetermined winding direction. The electrode body disassembly apparatus comprises: a first stretching device for stretching the first diaphragm; a second stretching device for stretching the second diaphragm; a roller disposed on the transport path of the first or second diaphragm to bend the transport direction of the wound sheet; and a control device. The control device is configured to control the first stretching device and the second stretching device to move the unwound portion of the electrode body along the transport path of the first or second diaphragm and wind it onto the roller.

[0016] The electrode disassembly device described above can achieve the same effect as the electrode disassembly method described above. Attached Figure Description

[0017] Figure 1 This is a partial cross-sectional three-dimensional view of the electrode body.

[0018] Figure 2 This is a three-dimensional diagram of the electrode body decomposition device.

[0019] Figure 3 This is a three-dimensional view of the electrode housing.

[0020] Figure 4 This is a three-dimensional view of the first separation device.

[0021] Figure 5 This is a perspective view of the first separation device with the scraper inserted into the curved section of the conveying path.

[0022] Figure 6 This is a front view of the first separation device with the scraper inserted into the curved section of the conveying path.

[0023] Figure 7 This is a three-dimensional view of the second separation device.

[0024] Figure 8 This is a perspective view of the second separation device after the stripping roller has descended.

[0025] Figure 9A This is the first half of the flowchart representing the decomposition process of the electrode.

[0026] Figure 9B This is the latter half of the flowchart representing the decomposition process of the electrode.

[0027] Figure 10 This is a perspective view of the first conveying section and the first separation device during the conveying of the first diaphragm sheet.

[0028] Figure 11 This is a side view of the second conveying section and the second separation device during the conveying of the second diaphragm sheet.

[0029] Figure 12 This is a schematic front view of the electrode body in a state where tension is applied to the second diaphragm.

[0030] Figure 13 This is a schematic front view of the unseparated portion, which is wound around the stripping roller.

[0031] Explanation of reference numerals in the attached figures

[0032] 1 Electrode body

[0033] 1A Undisintegrated part

[0034] 2 First diaphragm

[0035] 3. Negative electrode plate

[0036] 3S negative electrode laminate (a laminate of the first separator and the negative electrode)

[0037] 3a Negative electrode current collector foil

[0038] 3b Negative electrode active material layer

[0039] 4. Second diaphragm

[0040] 5 Positive electrode plates

[0041] 5S Positive Electrode Laminate (Laminated Laminate of Second Separator and Positive Electrode)

[0042] 5a Positive current collector foil

[0043] 5b Positive electrode active material layer

[0044] 10 Electrode Body Decomposition Device

[0045] 20 Electrode housing section

[0046] 21. Hold the clamp

[0047] 21a Holding section

[0048] 21b First mounting section

[0049] 21c Second mounting section

[0050] 22 Rotary Box

[0051] 23. Clamp lowering device

[0052] 23a Positioning component

[0053] Cylinder 23b

[0054] 30 First Control Department

[0055] 31 First clamping component

[0056] 31F Front Side Clamping Component

[0057] 31Rr Rear Side Clamping Part

[0058] 32 First moving device

[0059] 32a Support section

[0060] 32a1 Rotating device

[0061] 32a2 Rotary Motor

[0062] 32b Vertical guide

[0063] 32c Left and right directional guide

[0064] 32d vertical movement motor

[0065] 32e Left and right direction moving motor

[0066] 40 First Conveying Section (First Tensioning Device)

[0067] 41 Clamping rollers

[0068] 41L drive roller

[0069] 41R Driven Roller

[0070] 42 Conveyor Motor

[0071] 43 Clamping cylinder

[0072] 50 First Separation Device

[0073] 51 Bending Roller

[0074] 52 Scraper

[0075] 53 Scraper Insertion Device

[0076] 53a Guide rod

[0077] 53b Insertion cylinder

[0078] 60 First Diaphragm Recovery Section

[0079] 70 Negative Electrode Recycling Section

[0080] 71 Guide Board

[0081] 72 Negative electrode recycling bin

[0082] 80 Positive and negative electrode separation device

[0083] 81 Center scraper

[0084] 82 Scraper Lowering Device

[0085] 82a cylinder

[0086] 100 Control device

[0087] 130 Second Control Division

[0088] 131 Second clamping component

[0089] 131F Front Side Clamping Component

[0090] 131Rr Rear Side Clamping Part

[0091] 132 Second mobile device

[0092] 132a Support section

[0093] 132a1 Rotating device

[0094] 132a2 Rotary Motor

[0095] 132b Vertical guide

[0096] 132c Left and right directional guide

[0097] 132d vertical movement motor

[0098] 132e Left and right movement motor

[0099] 140 Second Conveying Section (Second Tensioning Device)

[0100] 141 Clamping Roller

[0101] 141L drive roller

[0102] 141R Driven Roller

[0103] 142 Conveyor Motor

[0104] 143 Clamping Cylinder

[0105] 145 Bending Roller

[0106] 150 Second Separation Unit

[0107] 151 Upstream Roller

[0108] 152 Downstream Roller

[0109] 153 Peeling Roller

[0110] 154-roll lowering device

[0111] 154a cylinder

[0112] 160 Second Diaphragm Recovery Section

[0113] 170 Positive Electrode Recycling Section

[0114] 180 Tension Detection Device

[0115] R1 First diaphragm conveying path

[0116] R1a Bending Section

[0117] R2 Second Diaphragm Delivery Path

[0118] R2a Bending Section

[0119] S10 Electrode Preparation Steps (Preparation Process)

[0120] S20 Positive and Negative Electrode Separation Step (First Separation Process)

[0121] S30 Negative Electrode Separation Steps

[0122] S40 Diaphragm Clamping Procedure

[0123] S50 diaphragm conveying steps (unwinding process)

[0124] S130 Positive electrode separation step (second separation process)

[0125] S140 Diaphragm Clamping Procedure

[0126] S150 Diaphragm Conveying Steps (Unwinding Process)

[0127] S160~S240 Unwinding steps and peeling control. Detailed Implementation

[0128] The following describes one embodiment of the electrode body disassembly apparatus. It should be noted that the embodiment described herein is not intended to limit the invention in any particular way. Furthermore, the figures are schematic diagrams and do not necessarily accurately reflect the actual embodiments. Hereinafter, components and parts that perform the same function will be labeled with the same reference numerals, and repeated descriptions will be omitted or simplified where appropriate.

[0129] In this specification, "energy storage device" refers to all devices capable of extracting electrical energy, including primary and secondary batteries, as well as chemical batteries such as lithium-ion batteries and nickel-metal hydride batteries, and physical batteries such as double-layer capacitors.

[0130] [Structure of the electrode]

[0131] Figure 1 This is a partial cross-sectional perspective view of the electrode body 1 according to one embodiment. The electrode body 1 is constructed from the electrode body disassembly apparatus 10 of this embodiment (see reference 10). Figure 2 The object to be decomposed. Electrode 1 is an electrode body removed from an energy storage device, which includes a battery casing housing the electrode body, electrode terminals, electrolyte, etc. The type of electrode body 1 is not particularly limited; for example, it can be an electrode body of a lithium-ion secondary battery. Various methods for removing electrode body 1 from the energy storage device have been proposed, without particular limitation.

[0132] like Figure 1 As shown, electrode body 1 is formed by sequentially stacking and winding a strip-shaped first diaphragm 2, a strip-shaped negative electrode 3, a strip-shaped second diaphragm 4, and a strip-shaped positive electrode 5 along a predetermined winding direction. Electrode body 1 is a so-called wound electrode body. Here, electrode body 1 is wound in a direction starting from the outermost periphery, with the first diaphragm 2, negative electrode 3, second diaphragm 4, and positive electrode 5 in sequence. The first diaphragm 2 and the second diaphragm 4 are configured such that their length in the longitudinal direction (circumferential direction of winding) is longer than that of the negative electrode 3 and the positive electrode 5. The winding end portion of electrode body 1 is formed by the first diaphragm 2 and the second diaphragm 4.

[0133] The first diaphragm 2 and the second diaphragm 4 are, for example, porous resin sheets with the required heat resistance and allowing electrolyte passage. The materials of the first diaphragm 2 and the second diaphragm 4 are not particularly limited. The first diaphragm 2 and the second diaphragm 4 are sandwiched between the positive electrode 5 and the negative electrode 3, thus insulating the positive electrode 5 and the negative electrode 3. The first diaphragm 2 and the second diaphragm 4 can also be adhesive diaphragms coated on both sides. In this case, the first diaphragm 2, the negative electrode 3, the second diaphragm 4, and the positive electrode 5 are bonded together.

[0134] The negative electrode 3 includes a negative electrode current collector foil 3a and a negative electrode active material layer 3b formed on the negative electrode current collector foil 3a. The negative electrode 3 is a component in which a negative electrode active material layer 3b containing the negative electrode active material is formed on the surface of the negative electrode current collector foil 3a. Here, the negative electrode current collector foil 3a is composed of copper foil of a predetermined width and thickness. The negative electrode active material is, for example, a material like natural graphite that can absorb lithium ions during charging and release the lithium ions absorbed during charging during discharging. Various alternatives to natural graphite have been proposed for the negative electrode active material, and there is no particular limitation. In the case where the energy storage device is not a lithium-ion secondary battery, the negative electrode 3 may include various negative electrode current collector foils 3a and negative electrode active material layers 3b corresponding to the type of energy storage device.

[0135] The positive electrode 5 includes a positive electrode current collector foil 5a and a positive electrode active material layer 5b formed on the positive electrode current collector foil 5a. The positive electrode 5 is a component in which a positive electrode active material layer 5b containing the positive electrode active material is formed on the surface of the positive electrode current collector foil 5a. Here, the positive electrode current collector foil 5a is composed of aluminum foil of a predetermined width and thickness. The positive electrode active material is, for example, a material like a lithium transition metal composite material that can release lithium ions during charging and absorb lithium ions during discharging. Various options for the positive electrode active material have been proposed, besides lithium transition metal composite materials, and there is no particular limitation. In the case where the energy storage device is not a lithium-ion secondary battery, the positive electrode 5 may include various positive electrode current collector foils 5a and positive electrode active material layers 5b corresponding to the type of energy storage device.

[0136] [Overview of the electrode body decomposition device]

[0137] Figure 2 This is a perspective view of the electrode body decomposition device 10. Hereinafter, for ease of explanation, [the following will be described as follows]. Figure 2 The left and right directions are called the left and right directions. Figure 2 The direction of depth is called the front-back direction. In the drawing, front, back, left, right, top, and bottom are represented by the reference numerals F, Rr, L, R, U, and D, respectively. For example... Figure 2 As shown, the electrode body decomposition device 10 includes: an electrode body receiving section 20, a first holding section 30, a first conveying section 40, a first separation device 50, a first diaphragm recovery section 60, a negative electrode recovery section 70, a second holding section 130, a second conveying section 140, a second separation device 150, a second diaphragm recovery section 160, a positive electrode recovery section 170, a positive and negative electrode separation device 80, a tension detection device 180, and a control device 100.

[0138] An electrode body 1, before disassembly, is placed in the electrode body receiving section 20. The electrode body disassembly device 10 is configured to unwind the wound electrode body 1 by stretching the first diaphragm 2 and the second diaphragm 4. During the unwinding process, the electrode body 1 is approximately wound around the axis W (see reference 10) inside the electrode body receiving section 20. Figure 1 Rotate.

[0139] The first gripping portion 30 grips the winding end portion of the first diaphragm 2 that extends outside the electrode body receiving portion 20. The negative electrode 3 is adhered to the first diaphragm 2. Since the length of the negative electrode 3 in the longitudinal direction is shorter than that of the first diaphragm 2, the laminate of the first diaphragm 2 and the negative electrode 3 (hereinafter also referred to as the negative electrode laminate 3S, see reference) Figure 3 The winding end portion of the electrode body 1 is composed only of the first diaphragm sheet 2. The first gripping portion 30 grips and moves the end portion of the first diaphragm sheet 2 during the initial stage of unwinding the electrode body 1, thus mounting the first diaphragm sheet 2 onto the first conveying portion 40. In this embodiment, the first gripping portion 30 is positioned to the left of the electrode body receiving portion 20.

[0140] The first conveying unit 40 uses a pair of clamping rollers 41 to hold the first diaphragm 2 and conveys the first diaphragm 2 by rotating the pair of clamping rollers 41. The first conveying unit 40 is located further to the left of the first holding unit 30. The first separating device 50 separates the first diaphragm 2 from the negative electrode 3 at a position upstream of the first conveying unit 40 (on the electrode body receiving part 20 side) in the conveying path R1 of the first diaphragm 2. Therefore, the first conveying unit 40 conveys only the first diaphragm 2 using the pair of clamping rollers 41. The first diaphragm 2 is conveyed by the first conveying unit 40 to the first diaphragm recovery unit 60. The negative electrode 3, after being separated from the first diaphragm 2, moves forward along with the first diaphragm 2 and is recovered to the negative electrode recovery unit 70 located downstream of the first separating device 50.

[0141] The second gripping portion 130 grips the winding end portion of the second diaphragm sheet 4 that extends outside the electrode body receiving portion 20. The positive electrode sheet 5 is adhered to the second diaphragm sheet 4. Since the length of the positive electrode sheet 5 in the longitudinal direction is shorter than that of the second diaphragm sheet 4, the laminate of the second diaphragm sheet 4 and the positive electrode sheet 5 (hereinafter also referred to as the positive electrode laminate 5S, see reference) Figure 3 The winding end portion of the electrode body 1 is composed only of the second diaphragm 4. The second gripping portion 130 grips and moves the end portion of the second diaphragm 4 during the initial unwinding stage of the electrode body 1, mounting the second diaphragm 4 onto the second conveying portion 140. In this embodiment, the second gripping portion 130 is located to the right of the electrode body receiving portion 20.

[0142] The second conveying section 140 uses a pair of clamping rollers 141 to hold the second diaphragm 4 and conveys the second diaphragm 4 by rotating the pair of clamping rollers 141. The second conveying section 140 is located further to the right of the second holding section 130. The second separating device 150 separates the second diaphragm 4 from the positive electrode 5 at a position upstream of the second conveying section 140 (on the electrode housing 20 side) in the conveying path R2 of the second diaphragm 4. Therefore, the second conveying section 140 conveys only the second diaphragm 4 using the pair of clamping rollers 141. The second diaphragm 4 is conveyed by the second conveying section 140 to the second diaphragm recovery section 160. The positive electrode 5, after being separated from the second diaphragm 4, falls into the positive electrode recovery section 170, which is located below the second separating device 150.

[0143] The positive and negative electrode separation device 80 assists in separating the negative electrode laminate 3S and the positive electrode laminate 5S when the first holding part 30 stretches the negative electrode laminate 3S and the second holding part 130 stretches the positive electrode laminate 5S. The positive and negative electrode separation device 80 assists in separating the electrode body 1 into the negative electrode laminate 3S and the positive electrode laminate 5S by inserting a central scraper 81 between the negative electrode laminate 3S and the positive electrode laminate 5S. The positive and negative electrode separation device 80 is disposed above the electrode body receiving part 20.

[0144] The tension detection device 180 detects the tension of the second diaphragm 4 stretched by the second conveying section 140. The electrode body disassembly device 10 detects the unwinding of the electrode body 1 and the stretching of the first diaphragm 2 and the second diaphragm 4 by detecting the tension applied to the second diaphragm 4 using the tension detection device 180.

[0145] [Electrode housing section]

[0146] Figure 3 This is a perspective view of the electrode housing 20. (See diagram below.) Figure 3 As shown, the electrode housing 20 includes a retaining clamp 21 and a rotating box 22 (see also...). Figure 4 ) and clamp lowering device 23 (see reference) Figure 2 ).

[0147] The electrode body 1 is held in the stage before the negative electrode laminate 3S is stretched by the first holding part 30 and the positive electrode laminate 5S is stretched by the second holding part 130. For example... Figure 3 As shown, the retaining clamp 21 includes: a retaining portion 21a that retains the electrode body 1; a first mounting portion 21b that mounts the terminal portion of a first diaphragm sheet 2 (negative electrode laminate 3S) extending from the electrode body 1; and a second mounting portion 21c that mounts the terminal portion of a second diaphragm sheet 4 (positive electrode laminate 5S) extending from the electrode body 1. The retaining portion 21a is wound around a winding shaft W (see reference). Figure 1The electrode body 1 is held in a generally front-to-back direction. The holding portion 21a holds the electrode body 1 with a pair of wide surfaces facing left (towards the first holding portion 30) and right (towards the second holding portion 130). The holding portion 21a is configured as a flat, box-shaped structure with a length in the left-to-right direction shorter than its length in the front-to-back direction. The upper surface of the holding portion 21a is open. The first mounting portion 21b extends to the left from the upper left edge of the holding portion 21a. The negative electrode laminate 3S is mounted in the first mounting portion 21b with the negative electrode 3 positioned above the first separator 2. The second mounting portion 21c extends to the right from the upper right edge of the holding portion 21a. The positive electrode laminate 5S is mounted in the second mounting portion 21c with the second separator 4 positioned above the positive electrode 5.

[0148] The rotating box 22 is a box-shaped component that houses the electrode body 1 after it extends from the holding clamp 21. The upper surface of the rotating box 22 is open. The holding clamp 21 is positioned at a predetermined location within the rotating box 22. The positioning member 23a, which determines the position of the holding clamp 21, will be explained when describing the clamp lowering device 23. The positions of the terminal portions of the first diaphragm sheet 2 (negative electrode laminate 3S) and the second diaphragm sheet 4 (positive electrode laminate 5S) are determined by the position of the holding clamp 21. The electrode body 1, after extending from the holding clamp 21, is unwound along with the first diaphragm sheet 2, the negative electrode sheet 3, the second diaphragm sheet 4, and the positive electrode sheet 5, and rotates approximately around the axis W inside the rotating box 22. The length of the rotating box 22 in the left-right direction is longer than the rotation diameter of the electrode body 1 to allow the electrode body 1 to move in the left-right direction.

[0149] After the negative electrode laminate 3S is held by the first holding part 30 and the positive electrode laminate 5S is held by the second holding part 130, the clamp lowering device 23 lowers the holding clamp 21 to a position lower than the rotating box 22 (see reference). Figure 4 ,exist Figure 4 In the process of lowering the retaining clamp 21, the electrode body 1 can rotate within the rotating box 22. The clamp lowering device 23 includes: a positioning member 23a that supports the retaining clamp 21 and determines the setting position of the retaining clamp 21; and a cylinder 23b that supports the positioning member 23a and extends and retracts in the vertical direction (see reference). Figure 2 However, the structure of the clamp lowering device 23 is not particularly limited.

[0150] [Positive and negative electrode separation device]

[0151] like Figure 3As shown, the positive and negative electrode separation device 80 includes a central scraper 81 and a scraper lowering device 82. The central scraper 81 is a plate-shaped component extending in both the front-to-back and vertical directions. The scraper lowering device 82 is configured to lower the central scraper 81 so that its lower end is inserted into the holding clamp 21, and to raise the central scraper 81 so that its lower end is disengaged from the holding clamp 21. Figure 2 As shown, the scraper lowering device 82 here includes a cylinder 82a that extends and retracts in the vertical direction. Figure 3 The middle diagram shows the state after the central scraper 81 has descended. (As shown...) Figure 3 As shown, when the central scraper 81 is lowered by the scraper lowering device 82, the central scraper 81 is inserted between the negative electrode laminate 3S and the positive electrode laminate 5S before the electrode body 1 is unwound.

[0152] [First Control Department]

[0153] like Figure 3 As shown, the first gripping part 30 includes a pair of first clamping members 31 and a first moving device 32. The pair of first clamping members 31 grip the first diaphragm sheet 2 (negative electrode laminate 3S). The pair of first clamping members 31 includes a front-side clamping member 31F and a rear-side clamping member 31Rr disposed at a position rearward of the front-side clamping member 31F. The front-side clamping member 31F grips the front side of the terminal portion of the first diaphragm sheet 2. The rear-side clamping member 31Rr grips the rear side of the terminal portion of the first diaphragm sheet 2.

[0154] The first moving device 32 causes a pair of first clamping members 31 to move along a predetermined conveying path R1 of the first diaphragm 2 (see reference). Figure 2 The phrase "moving along the conveying path R1 of the first diaphragm 2" is not limited to moving along a path consistent with the conveying path R1 of the first diaphragm 2, but broadly refers to moving in a manner that passes through a designated side (here, between the pair of clamping rollers 41, above the bending roller 51) of components arranged on the conveying path R1 (e.g., the pair of clamping rollers 41 of the first conveying unit 40, the bending roller 51 of the first separating device 50 described later). Here, the path by which the first moving device 32 moves the pair of first clamping members 31 is along the conveying path R1, up to at least passing between the pair of clamping rollers 41. Details of the path by which the first moving device 32 moves the pair of first clamping members 31 will be described later. The first gripping unit 30 grips the first diaphragm 2 using the pair of first clamping members 31, and the first moving device 32 moves the pair of first clamping members 31, thereby stretching the first diaphragm 2.

[0155] like Figure 3As shown, the first moving device 32 includes: a support portion 32a that supports a pair of first clamping members 31; a vertical guide member 32b that supports the support portion 32a so that it can move in the vertical direction; and a horizontal guide member 32c that supports the vertical guide member 32b so that it can move in the horizontal direction (see reference). Figure 2 ); The vertical moving motor 32d causes the support 32a to move along the vertical guide 32b (see reference). Figure 2 ); and a left-right moving motor 32e, which moves the up-down guide 32b along the left-right guide 32c (see reference ); Figure 2 ).

[0156] like Figure 3 As shown, the support portion 32a extends in the front-rear direction. The support portion 32a includes a rotating device 32a1 that rotates a pair of first clamping members 31 in the vertical direction. The rotating device 32a1 includes a rotating motor 32a2, which has a rotating shaft that rotates about an axis A1, which, when viewed in the front-rear direction, is offset from the base ends (here, the left ends) of each pair of first clamping members 31. The axis A1 of the rotating shaft of the rotating motor 32a2 extends in the front-rear direction. The pair of first clamping members 31 rotate about the axis A1. The posture of the pair of first clamping members 31 can be changed by the rotating device 32a1.

[0157] like Figure 2 As shown, the vertical guide 32b extends in the vertical direction. When the vertical movement motor 32d is driven, the support portion 32a and the pair of first clamping members 31 supported thereon are positioned in the vertical direction along the vertical guide 32b. The horizontal guide 32c extends in the horizontal direction. When the horizontal movement motor 32e is driven, the vertical guide 32b, the support portion 32a, and the pair of first clamping members 31 are positioned in the horizontal direction along the horizontal guide 32c. By combining the driving of the vertical movement motor 32d and the driving of the horizontal movement motor 32e, the pair of first clamping members 31 can be moved along a predetermined path when viewed in the front-back direction.

[0158] [First Conveying Section]

[0159] like Figure 2As shown, the first conveying unit 40 includes a pair of clamping rollers 41 that clamp and rotate the first diaphragm 2. The pair of clamping rollers 41 includes a drive roller 41L and a driven roller 41R positioned to the right of the drive roller 41L and facing it. The drive roller 41L and the driven roller 41R are each configured to rotate about a rotation axis extending in the front-rear direction. The first conveying unit 40 includes a conveying motor 42 that rotates the drive roller 41L. The conveying motor 42 is a motor capable of controlling the rotational speed or rotational torque. The conveying motor 42 is, for example, a servo motor. The first conveying unit 40 also includes a clamping cylinder 43 (see reference 41) that moves the driven roller 41R in the left-right direction to approach or move away from the drive roller 41L. Figure 4 The clamping cylinder 43 is a cylinder that extends and retracts in the left-right direction. However, the actuator that moves the driven roller 41R in the left-right direction is not limited to a cylinder; for example, it could also be an electric motor.

[0160] The first conveying unit 40 drives the clamping cylinder 43 when the first diaphragm 2 is located between the driving roller 41L and the driven roller 41R, thereby clamping the first diaphragm 2 using the driving roller 41L and the driven roller 41R (see reference). Figure 10 When the conveyor motor 42 is driven, the drive roller 41L rotates downwards on the side opposite to the driven roller 41R, conveying the first diaphragm 2 downwards together with the driven roller 41R. The first conveying unit 40 is an example of a first stretching device for stretching the first diaphragm 2. However, the first stretching device is not limited to having a pair of clamping rollers. The first stretching device may, for example, include a winding roller for winding the first diaphragm 2 and an arm for stretching the first diaphragm 2. By being conveyed by the first conveying unit 40, the first diaphragm 2 moves along a predetermined conveying path R1. A first diaphragm recovery unit 60 is provided below the drive roller 41L and the driven roller 41R.

[0161] [First separation device]

[0162] The first separation device 50 separates the first diaphragm 2 from the negative electrode 3 at a position upstream of the first conveying section 40 in the conveying path R1 of the first diaphragm 2. Figure 4 This is a perspective view of the first separation device 50. (See diagram below.) Figure 4 As shown, the first separation device 50 includes a bending roller 51, a scraper 52, and a scraper insertion device 53.

[0163] A bending roller 51 is disposed on the conveying path R1 of the first diaphragm 2, causing the conveying path R1 to bend. The bending roller 51 extends in the front-to-back direction. The bending roller 51 is configured to rotate about a rotation axis extending in the front-to-back direction. In this embodiment, the bending roller 51 is disposed to the left and above the rotating box 22 of the electrode housing 20. The first diaphragm 2 is wound around the bending roller 51 from above by the first holding part 30. Between the electrode housing 20 and the bending roller 51, the first diaphragm 2 is conveyed obliquely upward to the left.

[0164] A bending roller 51 is positioned above a pair of clamping rollers 41 in the first conveying section 40. The bending roller 51 bends the conveying path R1 of the first diaphragm 2 toward the pair of clamping rollers 41 (here, below). However, the direction in which the bending roller 51 bends the conveying path R1 of the first diaphragm 2 is not particularly limited. For example, the direction in which the bending roller 51 bends the conveying path R1 of the first diaphragm 2 could be upwards. The angle θ1 at which the bending roller 51 bends the conveying path R1 (refer to...) Figure 6 θ1 represents the interior angle (the smaller θ1 is, the more acute the curve). There is no particular limitation, for example, it can be less than 120 degrees. It should be noted that the attached figure reference numeral R1a represents the curved part (curved portion) of the conveying path R1.

[0165] The scraper 52 is a separating component that separates the first diaphragm sheet 2 from the negative electrode sheet 3. The scraper 52 is configured as a plate extending in both the front-to-back and left-to-right directions, and has an upper surface 52U and a lower surface 52D. The scraper 52 separates the first diaphragm sheet 2 from the negative electrode sheet 3 on the upper surface 52U side and the lower surface 52D side. In the main view, the front end 52R of the scraper 52 is formed into a cone shape, with its vertical height decreasing towards the upstream side of the conveying path R1 of the first diaphragm sheet 2 (see also [reference]). Figure 6 In this embodiment, the upper surface 52U of the scraper 52 is bent to form a tapered front end 52R. Here, the lower surface 52D of the scraper 52 is flat. The width of the scraper 52 in the front-to-back direction is longer than the width of the negative electrode 3.

[0166] The scraper insertion device 53 inserts the scraper 52 into the curved portion R1a of the conveying path R1, or causes the scraper 52 to retract from the curved portion R1a. Figure 5 This is a perspective view of the first separation device 50 with the scraper 52 inserted into the curved portion R1a of the conveying path R1. (See image below.) Figure 4 as well as Figure 5As shown, the scraper 52 is positioned at its right end at the curved portion R1a of the conveying path R1 of the first diaphragm 2. The scraper insertion device 53 inserts the scraper 52 into the conveying path R1 after the front end of the first diaphragm 2 has passed through the curved portion R1a and before the front end of the negative electrode 3 reaches the curved portion R1a. By inserting the scraper 52 into the conveying path R1 at this time, the first diaphragm 2 can be wound onto the bending roller 51, and, through subsequent movement of the first diaphragm 2, the front end 52R of the scraper 52 enters between the first diaphragm 2 and the negative electrode 3. When the negative electrode 3 is peeled from the first diaphragm 2 by the scraper 52, the negative electrode 3, located above the first diaphragm 2, rests on the upper surface 52U of the scraper 52. The first diaphragm 2, located below the negative electrode 3, is conveyed on the lower surface 52D side of the scraper 52.

[0167] like Figure 5 As shown, the scraper insertion device 53 includes a pair of guide rods 53a at the front and rear and an insertion cylinder 53b. By driving the insertion cylinder 53b, the scraper 52 approaches or moves away from the bending roller 51 along the guide rods 53a. In this embodiment, the scraper insertion device 53 supports the scraper 52 at an angle such that the front end 52R of the scraper 52 is located above the base end 52L. The scraper 52 is tilted upward to the right. The scraper insertion device 53 moves the scraper 52 obliquely upward to the right, bringing it closer to the bending roller 51. When the scraper insertion device 53 is driven toward the side where the scraper 52 is approaching, the scraper 52 abuts against the surface of the first diaphragm 2 wound on the bending roller 51 (abutting against the bending roller 51 via the first diaphragm 2).

[0168] Figure 6 This is a front view of the first separation device 50 with the scraper 52 inserted into the curved portion R1a of the conveying path R1. (See image) Figure 6 As shown, in this embodiment, the scraper 52 abuts against the circumferential midpoint or near the midpoint of the area of ​​the first diaphragm 2 wound around the bending roller 51. More specifically, the front end 52R or its vicinity of the scraper 52 abuts against the first diaphragm 2 (via the first diaphragm 2 and the bending roller 51). However, as long as the negative electrode sheet 3 can be peeled off from the first diaphragm 2, the posture of the scraper 52, the portion of the scraper 52 that abuts against the bending roller 51, and the portion of the bending roller 51 for the scraper 52 to abut against are not limited.

[0169] like Figure 5 As shown, the negative electrode recovery unit 70 includes a guide plate 71, which is positioned below the scraper 52 and extends to the left relative to the scraper 52. The negative electrode 3, separated by the first separation device 50 and resting on the upper surface 52U of the scraper 52, is conveyed onto the guide plate 71 along with the first diaphragm 2 by the first conveying unit 40. The guide plate 71 descends and tilts to the left. Figure 2 As shown, a negative electrode recycling box 72 is provided below the left end of the guide plate 71. The negative electrode 3, after passing through the guide plate 71, is collected in the negative electrode recycling box 72.

[0170] [Second Control Section]

[0171] The second holding portion 130 holding the second diaphragm 4 is configured in the same way as the first holding portion 30 holding the first diaphragm 2. For example... Figure 3 As shown, the second gripping part 130 includes a pair of second clamping members 131 and a second moving device 132. The pair of second clamping members 131 grip the second diaphragm sheet 4 (positive electrode laminate 5S). The pair of second clamping members 131 includes a front side clamping member 131F and a rear side clamping member 131Rr disposed at a position rearward of the front side clamping member 131F.

[0172] The second moving device 132 causes a pair of second clamping members 131 to move along a predetermined conveying path R2 of the second diaphragm 4 (see reference). Figure 2 The second moving device 132 includes: a support portion 132a, which has a rotating device 132a1 for rotating a pair of second clamping members 131; a vertical guide member 132b that supports the support portion 132a so that it can move in the vertical direction; and a horizontal guide member 132c that supports the vertical guide member 132b so that it can move in the horizontal direction (see reference). Figure 2 ); The vertical movement motor 132d causes the support 132a to move along the vertical guide 132b (see reference). Figure 2 ); and a left-right moving motor 132e, which moves the up-down guide 132b along the left-right guide 132c (see reference 132c). Figure 2 The rotating device 132a1 includes a rotating motor 132a2, which has a rotating shaft that rotates about an axis A2, which is offset from the base ends (in this case, the right ends) of the pair of second clamping members 131 when viewed in the front-back direction. The rotating device 132a1 allows the orientation of the pair of second clamping members 131 to be changed. The second gripping part 130 grips the second diaphragm 4 using the pair of second clamping members 131, and the second moving device 132 moves the pair of second clamping members 131, thereby stretching the second diaphragm 4.

[0173] [Second Conveyor Section]

[0174] The second conveying section 140 for conveying the second diaphragm 4 is configured similarly to the first conveying section 40 for conveying the first diaphragm 2. For example... Figure 2 As shown, the second conveying unit 140 includes a pair of clamping rollers 141 that clamp and rotate the second diaphragm 4. The pair of clamping rollers 141 includes a drive roller 141L and a driven roller 141R positioned to the right of the drive roller 141L and facing it. The second conveying unit 140 includes a conveying motor 142 (see reference 141L) that rotates the drive roller 141L. Figure 11 The conveyor motor 142 is a motor capable of controlling rotational speed or rotational torque. For example, the conveyor motor 142 is a servo motor. The second conveying unit 140 also includes a clamping cylinder 143 that moves the driven roller 141R in the left-right direction to approach or move away from the driving roller 141L. A bending roller 145 is provided above the driving roller 141L and the driven roller 141R. This bending roller 145 bends the conveying path R2 of the second diaphragm sheet 4, which is approximately horizontal up to this point, in a substantially vertical direction, so that it faces the driving roller 141L and the driven roller 141R.

[0175] The second conveying unit 140 drives the clamping cylinder 143 while the second diaphragm 4 is positioned between the driving roller 141L and the driven roller 141R, thereby clamping the second diaphragm 4 using the driving roller 141L and the driven roller 141R (see reference). Figure 11 When the conveyor motor 142 is driven, the drive roller 141L rotates downwards on the side opposite to the driven roller 141R, conveying the second diaphragm sheet 4 downwards together with the driven roller 141R. The second conveying section 140 is an example of a second stretching device for stretching the second diaphragm sheet 4. However, the second stretching device is not limited to having a pair of clamping rollers. The second stretching device may, for example, include a winding roller for winding the second diaphragm sheet 4 and an arm for stretching the second diaphragm sheet 4. A second diaphragm recovery section 160 is provided below the drive roller 141L and the driven roller 141R.

[0176] [Second Separation Device]

[0177] The second separation device 150 separates the second diaphragm 4 from the positive electrode 5 at a position upstream of the second conveying section 140 in the conveying path R2 of the second diaphragm 4. Figure 7 This is a perspective view of the second separation device 150. It should be noted that... Figure 7 This diagram shows the state in which the second diaphragm sheet 4 is wound midway through the second separation device 150. (See diagram below.) Figure 7 As shown, the second separation device 150 includes an upstream roller 151, a downstream roller 152, and a stripping roller 153 (see also...). Figure 11 ,exist Figure 11 In order to make it easier to observe the stripping roller 153, the figure shows the state with the bearing of the stripping roller 153 removed, as well as the roller lowering device 154.

[0178] An upstream roller 151 is disposed on the transport path R2 of the second diaphragm 4 and winds the second diaphragm 4 (positive electrode laminate 5S). The upstream roller 151 extends in the front-to-back direction. The upstream roller 151 is configured to rotate about a rotation axis extending in the front-to-back direction. In this embodiment, the upstream roller 151 is disposed to the right and above the rotating box 22 of the electrode housing 20. The second diaphragm 4 (positive electrode laminate 5S) is wound onto the upstream roller 151 from above by the second holding part 130. Between the electrode housing 20 and the upstream roller 151, the second diaphragm 4 (positive electrode laminate 5S) is transported obliquely upward to the right.

[0179] The downstream roller 152 is positioned downstream of the upstream roller 151 in the transport path R2 of the second diaphragm 4, and winds the second diaphragm 4 around it. Here, the downstream roller 152 is positioned to the right and above the upstream roller 151. The downstream roller 152 extends in the front-to-back direction. The downstream roller 152 is configured to rotate about a rotation axis extending in the front-to-back direction. The second diaphragm 4 is wound onto the downstream roller 152 from below via the second holding portion 130. The downstream roller 152 is positioned at approximately the same height as the bending roller 145 of the second transport portion 140. The second diaphragm 4 is transported approximately horizontally between the downstream roller 152 and the bending roller 145.

[0180] A stripping roller 153 is positioned in the left-right direction between the upstream roller 151 and the downstream roller 152. The stripping roller 153 is disposed on the transport path R2 of the second diaphragm 4 and is a roller that bends the transport path R2 to separate the second diaphragm 4 from the positive electrode sheet 5. As described later, the stripping roller 153 is also used to unwind the electrode body 1 near its innermost circumference. The stripping roller 153 extends in the front-back direction. The stripping roller 153 rotates about a rotation axis extending in the front-back direction.

[0181] The roller lowering device 154 is configured to lower the peeling roller 153, moving it to a position below the line L1 connecting the upstream roller 151 and the downstream roller 152. Here, the roller lowering device 154 moves the peeling roller 153 downwards, causing it to collide with the second diaphragm 4. Alternatively, the roller lowering device 154 is also configured to raise the peeling roller 153, moving it to a position above the line L1 connecting the upstream roller 151 and the downstream roller 152. Figure 2 As shown, the roller lowering device 154 includes a cylinder 154a that extends and retracts in the vertical direction. However, the structure of the roller lowering device 154 is not limited to this. For example, the roller lowering device 154 may also include a motor for raising and lowering the stripping roller 153.

[0182] Figure 8 This is a perspective view of the second separation device 150 after the stripping roller 153 has descended. Figure 8As shown, when the positive electrode laminate 5S is wound on the upstream roller 151 and the downstream roller 152, the drive roller lowering device 154 lowers the stripping roller 153 to a position below line L1, bending the conveying path R2 into a V-shape via the stripping roller 153. The positive electrode laminate 5S is wound on the stripping roller 153. By bending the conveying path R2 into a V-shape, the positive electrode 5S is separated from the second diaphragm sheet 4 (see also...). Figure 11 The stripping roller 153 separates the second diaphragm 4 from the positive electrode 5 by bending the conveying path R2 of the second diaphragm 4. A positive electrode recovery section 170 for recovering the positive electrode 5 is provided below the stripping roller 153. The angle θ2 by which the stripping roller 153 bends the conveying path R2 (refer to...) Figure 11 θ2 represents the interior angle (the smaller θ2 is, the more acute the bend). There is no particular limitation, for example, it can be less than 60 degrees. The reference numeral R2a indicates the portion (bent portion) of the conveying path R2 that is bent by the stripping roller 153.

[0183] It should be noted that the upstream roller 151 and the downstream roller 152 can also be arranged in a direction other than left and right, such as up and down. The direction of movement of the stripping roller 153 is not particularly limited as long as it intersects the line connecting the upstream roller 151 and the downstream roller 152.

[0184] [Tension Detection Device]

[0185] Tension detection device 180 detects the tension of the second diaphragm 4 stretched by the second conveying section 140. In this embodiment, tension detection device 180 is provided on a bending roller 145 that bends the conveying path R2 of the second diaphragm 4 in a generally vertical direction. Here, tension detection device 180 measures the force that presses the bending roller 145 downward through the second diaphragm 4. However, the location of tension detection device 180 is not limited to the bending roller 145. Tension detection device 180 can also detect the tension applied to the second diaphragm 4 by obtaining the rotational torque of the conveying motor 142 of the second conveying section 140, for example. It should be noted that tension detection device 180 can also be configured to detect the tension of the first diaphragm 2 stretched by the first conveying section 40. Electrode body disintegration device 10 may also simultaneously include a tension detection device for detecting the tension of the first diaphragm 2 stretched by the first conveying section 40 and a tension detection device for detecting the tension of the second diaphragm 4 stretched by the second conveying section 140.

[0186] [Control device]

[0187] Control device 100 (reference) Figure 2The control device 100 is connected to the cylinder 23b of the clamping lowering device 23, the pair of first clamping members 31 of the first gripping part 30, the rotary motor 32a2, the up-down moving motor 32d and the left-right moving motor 32e, the conveying motor 42 and the clamping cylinder 43 of the first conveying part 40, the insertion cylinder 53b of the scraper insertion device 53, the pair of second clamping members 131 of the second gripping part 130, the rotary motor 132a2, the up-down moving motor 132d and the left-right moving motor 132e, the conveying motor 142 and the clamping cylinder 143 of the second conveying part 140, the cylinder 154a of the roller lowering device 154, and the cylinder 82a of the scraper lowering device 82, and controls their operation. In addition, the control device 100 is connected to the tension detection device 180 and receives signals from the tension detection device 180 corresponding to the tension of the second diaphragm 4. The control device 100 controls each part, performing the actions described later in the disassembly process of the electrode body 1.

[0188] The structure of the control device 100 is not particularly limited. For example, the control device 100 may include a microcomputer. The microcomputer may include, for example, an interface (I / F) for receiving data from external devices, a central processing unit (CPU) for executing program instructions, a ROM (read-only memory) storing the program executed by the CPU, RAM (random access memory) used as a working area for program execution, and a memory storing the aforementioned program and various data. The control device 100 may also include, for example, a programmable logic controller (PLC).

[0189] [Disassembly process of the electrode]

[0190] Hereinafter, an example of the process of decomposing electrode 1 by electrode body decomposition apparatus 10 according to this embodiment will be described.

[0191] [Separation of negative and positive electrodes]

[0192] Figure 9A This is the first half of the flowchart representing the decomposition process of electrode 1. Figure 9B This is the latter half of the flowchart illustrating the decomposition process of electrode 1. For example... Figure 9AAs shown, in the electrode preparation step S10, electrode body 1 is prepared. In the positive and negative electrode separation step S20, at the end of the winding of electrode body 1, electrode body 1 is separated into a first diaphragm sheet 2 and a negative electrode sheet 3, and a second diaphragm sheet 4 and a positive electrode sheet 5. Furthermore, in the positive and negative electrode separation step S20, by stretching the first diaphragm sheet 2 and the second diaphragm sheet 4 respectively, electrode body 1 is unwound, and electrode body 1 is separated into a negative electrode laminate 3S, which is a laminate of the first diaphragm sheet 2 and the negative electrode sheet 3, and a positive electrode laminate 5S, which is a laminate of the second diaphragm sheet 4 and the positive electrode sheet 5. Figure 9A As shown, the positive and negative electrode separation step S20 includes the terminal part processing step S21, the electrode body installation step S22, the holding step S23, the center scraper lowering step S24, the stretching step S25, the center scraper raising step S26, and the clamp lowering step S27.

[0193] In the terminal processing step S21, at the end of the winding of the electrode body 1, the electrode body 1 is separated into a first diaphragm sheet 2 and a negative electrode sheet 3, and a second diaphragm sheet 4 and a positive electrode sheet 5. The terminal processing step S21 varies depending on the terminal processing of the electrode body 1. For example, the tape pasted on the terminal is peeled off, the terminal portion of the first diaphragm sheet 2 is bent to the left, and the terminal portion of the second diaphragm sheet 4 is bent to the right.

[0194] In electrode mounting step S22, the electrode 1, which has undergone terminal processing step S21, is mounted onto the holding fixture 21. In electrode mounting step S22, the terminal portion of the first diaphragm 2 is placed on the first mounting portion 21b of the holding fixture 21 (see reference). Figure 3 Additionally, in the electrode mounting step S22, the end portion of the second diaphragm 4 is placed on the second mounting portion 21c of the holding clamp 21 (see reference). Figure 3 The terminal processing step S21 and the electrode installation step S22 can also be performed manually. However, the terminal processing step S21 and the electrode installation step S22 can also be performed automatically or semi-automatically. The terminal processing step S21 can also be performed while the electrode 1 is housed in the holding clamp 21.

[0195] In the holding step S23, the terminal portion of the first diaphragm 2 is held by a pair of first clamping members 31, and the terminal portion of the second diaphragm 4 is held by a pair of second clamping members 131 (see reference). Figure 3 In the central scraper descent step S24, the central scraper 81 descends and is inserted between the negative electrode laminate 3S and the positive electrode laminate 5S (see reference). Figure 3In stretching step S25, the first diaphragm 2, held by a pair of first clamping members 31, is stretched diagonally upward to the left by the first moving device 32, and the second diaphragm 4, held by a pair of second clamping members 131, is stretched diagonally upward to the right by the second moving device 132 (see reference). Figure 4 In the central scraper raising step S26, the central scraper 81 rises and retracts from the holding clamp 21. In the clamp lowering step S27, the holding clamp 21 lowers. As a result, the electrode body 1 can rotate freely.

[0196] [Recycling of the first diaphragm and the negative electrode]

[0197] In the negative electrode separation step S30, the negative electrode laminate 3S is wound onto the bending roller 51 to bend the conveying path R1 of the first diaphragm 2. A plate-shaped scraper 52 is inserted into the bent portion R1a of the conveying path R1, separating the first diaphragm 2 from the negative electrode 3 on the first surface (here, the lower surface 52D) and the second surface (here, the upper surface 52U) of the scraper 52. More specifically, as... Figure 9A As shown, the negative electrode separation step S30 includes a winding step S31, a clamping member stopping step S32, a scraper insertion step S33, and a clamping member re-moving step S34.

[0198] In the winding step S31, a pair of first clamping members 31 are moved above and to the left of the bending roller 51, and then from there moved below and to the left of the bending roller 51, thereby winding the first diaphragm 2 onto the bending roller 51 (see reference). Figure 4 In the clamping member stopping step S32, the movement of the pair of first clamping members 31 is stopped. At the moment of clamping member stopping step S32, only the first diaphragm 2 of the negative electrode laminate 3S is wound on the bending roller 51. At this time, the negative electrode 3 is located upstream of the conveying path R1 relative to the bending roller 51. By stopping the pair of first clamping members 31 below and to the left of the bending roller 51 near the bending roller 51 (stopping them immediately after the first diaphragm 2 is wound on the bending roller 51), the negative electrode 3 can be positioned upstream of the bending roller 51 on the conveying path R1, regardless of the distance between the end portion of the first diaphragm 2 in the electrode body 1 to be decomposed and the end portion of the negative electrode 3.

[0199] In the scraper insertion step S33, the scraper 52 is moved to the right and inserted into the curved portion R1a of the conveying path R1. In the negative electrode separation step S30, the scraper 52 is inserted into the conveying path R1 from outside the conveying path R1 after the front end of the first diaphragm 2 has passed through the curved portion R1a of the conveying path R1 and before the front end of the negative electrode 3 reaches the curved portion R1a of the conveying path R1. Here, the scraper 52 is inserted into the conveying path R1 from outside the conveying path R1 during the period when the movement of the pair of first clamping members 31 stops.

[0200] In the clamping member re-movement step S34, the pair of first clamping members 31 are moved downwards. As a result, the negative electrode laminate 3S is unwound again, and the negative electrode 3 is slightly wound around the bending roller 51. When the negative electrode 3 is wound around the bending roller 51, due to the rigidity of the negative electrode 3, the terminal portion (the front end in the moving direction) of the negative electrode 3 lifts off the first diaphragm 2. However, the negative electrode 3, which includes a negative electrode current collector foil 3a made of copper foil, is less rigid and more easily bent than the positive electrode current collector foil 5a made of aluminum foil. Furthermore, the adhesion between the negative electrode 3 and the first diaphragm 2 is stronger than the adhesion between the positive electrode 5 and the second diaphragm 4. Therefore, separation of the negative electrode 3 from the first diaphragm 2 is not necessarily further performed. Therefore, in the scraper insertion step S33, the scraper 52 is inserted into the curved portion R1a of the conveying path R1 of the first diaphragm 2.

[0201] In step S34, the negative electrode 3 is moved to the location of the front end 52R of the scraper 52 via the clamping member. This inserts the front end 52R of the scraper 52 between the first diaphragm 2 and the dislodged negative electrode 3 (see reference). Figure 6 As the first diaphragm 2 is conveyed downstream of the conveying path R1, the negative electrode 3 is sequentially peeled off from the first diaphragm 2 by the scraper 52. The same applies after the device for conveying the first diaphragm 2 is changed to the first conveying unit 40.

[0202] In the first diaphragm clamping step S40, in step S41, a pair of first clamping members 31 are moved to a position lower than the pair of clamping rollers 41 of the first conveying section 40. At this time, the pair of first clamping members 31 pass between the pair of clamping rollers 41. As a result, the first diaphragm 2 is guided between the pair of clamping rollers 41. In step S42, the driven roller 41R is moved to the left, and the first diaphragm 2 is clamped by the driving roller 41L and the driven roller 41R. In step S43, the pair of first clamping members 31 are opened, releasing the gripping of the first diaphragm 2.

[0203] In the first diaphragm conveying step S50, the drive roller 41L is rotated to convey the first diaphragm sheet 2. Figure 10 This is a perspective view of the first conveying section 40 and the first separating device 50 during the conveying of the first diaphragm sheet 2. Figure 10 As shown, the first diaphragm 2 is conveyed by the first conveying section 40, and the first diaphragm 2 and the negative electrode 3 are unwound from the electrode body 1, and the first diaphragm 2 and the negative electrode 3 are separated and recovered. At this time, the control device 100 controls the conveying motor 42 at a constant speed so that it rotates at a predetermined speed.

[0204] It should be noted that, although in Figure 9ANot shown, but during the movement of the pair of first clamping members 31, the posture of the pair of first clamping members 31 is changed in a timely manner by the rotating device 32a1. Specifically, in the gripping step S23, the pair of first clamping members 31 are positioned with their front ends facing to the right (see reference). Figure 3 Then, the pair of first clamping members 31 rotate 90 degrees clockwise in the main view, so that their front ends face downwards. In the winding step S31, the pair of first clamping members 31 rotate 180 degrees counterclockwise in the main view, so that their front ends face upwards (see reference). Figure 4 Thus, the first diaphragm 2 can be smoothly stretched and conveyed to the first conveying section 40. However, the posture of the pair of first clamping members 31 is not limited to the above posture. As long as no particular problems arise, the pair of first clamping members 31 may be supported on the support section 32a in a swingable manner or fixed to the support section 32a in a non-swingable manner.

[0205] [Recycling of the second diaphragm and the positive electrode]

[0206] In this embodiment, the second diaphragm 4 and the positive electrode 5 are separated and recovered in parallel with the separation and recovery of the first diaphragm 2 and the negative electrode 3.

[0207] In the positive electrode separation step S130, the positive electrode laminate 5S is wound onto the peeling roller 153, causing the conveying path R2 of the second diaphragm 4 to bend, thus separating the second diaphragm 4 from the positive electrode 5. More specifically, as follows... Figure 9A As shown, the positive electrode separation step S130 includes a clamping member moving step S131, a clamping member returning step S132, a roller descending step S133, and a clamping member re-moving step S134.

[0208] In the clamping member moving step S131, a pair of second clamping members 131 are moved to the right of the downstream roller 152 (downstream of the conveying path R2), and the second diaphragm 4 is guided to a position above the upstream roller 151 and the downstream roller 152 and below the peeling roller 153 (see reference). Figure 7 In the clamping member return step S132, a pair of second clamping members 131 are moved to the left (upstream side of the conveying path R2) by a predetermined distance (see reference). Figure 8 As a result, the positive electrode laminate 5S relaxes and rests on the upstream roller 151 and the downstream roller 152 without any tension applied.

[0209] In the roll lowering step S133, the stripping roll 153 is lowered to a position below the upstream roll 151 and the downstream roll 152. As a result, the positive electrode laminate 5S is wound onto the stripping roll 153. Figure 8 As shown, the conveying path R2 of the second diaphragm 4 is bent into a V shape by the peeling roller 153.

[0210] The positive electrode 5 includes a positive current collector foil 5a made of aluminum foil, which has a certain degree of rigidity. Furthermore, the positive electrode 5 does not adhere as strongly to the second separator 4. Therefore, the positive electrode 5 separates from the second separator 4 due to the bending of the transport path R2.

[0211] In the clamping member re-movement step S134, the pair of second clamping members 131 are moved to the right again. Along with this movement of the pair of second clamping members 131, the positive electrode 5 is sequentially peeled off at the curved portion R2a of the transport path R2. The same process continues after the device for transporting the second diaphragm sheet 4 is changed to the second transport section 140.

[0212] In the second diaphragm clamping step S140, in step S141, a pair of second clamping members 131 are moved from above the bending roller 145 to the right and below the bending roller 145. As a result, the second diaphragm sheet 4 is wound around the bending roller 145. In step S142, the pair of second clamping members 131 are moved to a position lower than the pair of clamping rollers 141 of the second conveying section 140. At this time, the pair of second clamping members 131 pass between the pair of clamping rollers 141. As a result, the second diaphragm sheet 4 is guided between the pair of clamping rollers 141. In step S143, the driven roller 141R is moved to the left, clamping the second diaphragm sheet 4 using the driving roller 141L and the driven roller 141R. In step S144, the pair of second clamping members 131 are opened, releasing the second diaphragm sheet 4 from the grip.

[0213] In the second diaphragm conveying step S150, the drive roller 141L is rotated to convey the second diaphragm sheet 4. Figure 11 This is a front view of the second conveying section 140 and the second separating device 150 during the conveying of the second diaphragm sheet 4. Figure 11 As shown, the second diaphragm 4 and the positive electrode 5 are unwound from the electrode body 1 by being conveyed by the second conveying section 140, and the second diaphragm 4 and the positive electrode 5 are separated and recovered. At this time, the control device 100 controls the conveying motor 142 at a constant speed so that it rotates at a predetermined speed.

[0214] Although Figure 9A Not shown, but similarly to the movement of the pair of first clamping members 31, the posture of the pair of second clamping members 131 is changed in a timely manner by the rotating device 132a1 during the movement of the pair of second clamping members 131. Specifically, in the gripping step S23, the pair of second clamping members 131 assume a posture with their front ends facing left (see reference...). Figure 3 Then, the pair of second clamping members 131 rotate 90 degrees counterclockwise in the main view, so that the front ends face downwards (see reference). Figure 7In step S141 (winding of the second diaphragm sheet to the bending roller 145), a pair of second clamping members 131 rotate 180 degrees clockwise in the main view, so that the front ends face upwards.

[0215] [Opening the book at the innermost perimeter]

[0216] In the final stage of unwinding the electrode body 1, the control device 100 performs control (hereinafter also called peel control) to unwind the innermost periphery (hereinafter referred to as the innermost periphery) of the winding of the electrode body 1. The innermost periphery refers to the portion, for example, from about five turns, starting from the initial overlapping and winding of the first diaphragm 2, the negative electrode 3, the second diaphragm 4, and the positive electrode 5. The control device 100 begins peel control after the unwinding of the electrode body 1 stops and tension is applied to the first diaphragm 2 and the second diaphragm 4, typically before unwinding the innermost periphery. However, if the unwinding of the electrode body 1 does not stop, peel control may not be performed.

[0217] like Figure 9B As shown, in step S160 of the decomposition process of electrode body 1, it is determined whether the tension of the second diaphragm 4 detected by the tension detection device 180 exceeds a predetermined tension. If the tension of the second diaphragm 4 does not exceed the predetermined tension (if the result of step S160 is no), steps S50 and S150 continue. If the tension of the second diaphragm 4 exceeds the predetermined tension (if the result of step S160 is yes), in step S170, the control of the conveying motor 42 of the first conveying unit 40 is switched to constant torque control to rotate the conveying motor 42 with a certain torque.

[0218] Figure 12 This is a schematic front view of the electrode body 1 in a state where tension is applied to the second diaphragm 4. Figure 12 As shown, when the tension of the second diaphragm 4 exceeds a predetermined tension, the first diaphragm 2 and the second diaphragm 4 are stretched in opposite directions. As a result, the unwound portion of the electrode body 1 (typically the innermost circumference, hereinafter also referred to as the unresolved portion 1A) is suspended from the unwound first diaphragm 2 and the second diaphragm 4. At this time, the unresolved portion 1A becomes difficult to unwound. Figure 12 In the state shown, the force line F1 of the force stretching the first diaphragm 2 and the force line F2 of the force stretching the second diaphragm 4 approximately overlap. Therefore, almost no force is generated to rotate the undisassembled portion 1A, making it difficult to peel off the bonded negative electrode laminate 3S and positive electrode laminate 5S. Therefore, the unwinding of the electrode body 1 does not proceed as before. Since the electrode body 1 can no longer be unwound, a tension exceeding a predetermined tension is applied to the second diaphragm 4.

[0219] It should be noted that when unwinding the portion of electrode 1 near its outer peripheral surface, the force lines F1 and F2 shift in the thickness direction of electrode 1 due to its thickness. Therefore, rotational force is easily generated in electrode 1 when unwinding the portion of electrode 1 near its outer peripheral surface.

[0220] Return to Figure 9B In step S170, when the control of the conveyor motor 42 of the first conveyor section 40 is switched to constant torque control, the conveyor motor 142 of the second conveyor section 140 aims to increase torque by rotating at a constant speed. On the other hand, the conveyor motor 42 of the first conveyor section 40 rotates with a predetermined torque. Therefore, the undisassembled portion 1A of the electrode body 1 is stretched to the right by the second conveyor section 140.

[0221] In step S180, it is determined whether the conveyor motor 142 of the second conveying unit 140 has rotated by a predetermined rotation angle. In step S180, it may also be determined whether a predetermined time has elapsed since step S170. If the rotation angle of the conveyor motor 142 has not reached the predetermined rotation angle (if the result of step S180 is negative), constant torque control and constant speed control of the conveyor motor 142 continue.

[0222] The specified rotation angle in step S180 is set to a predetermined position that moves the unseparated portion 1A to a position relative to the second conveying section 140 (downstream in the conveying direction, to the right in this case) of the peeling roller 153 of the second separating device 150. Therefore, the unseparated portion 1A is wound onto the peeling roller 153 midway through its movement. It should be noted that the specified rotation angle in step S180 can also be the rotation angle that results in the unseparated portion 1A being wound onto the peeling roller 153. Figure 13 This is a schematic front view of the unseparated portion 1A, wound around the stripping roller 153. (See attached image.) Figure 13 As shown, at this time, the unseparated portion 1A is wound on a peeling roller 153 that bends the conveying direction of the wound sheet. Therefore, the force line F1 of the force stretching the first diaphragm sheet 2 is not parallel to the force line F2 of the force stretching the second diaphragm sheet 4. This generates a force F3 that rotates the unseparated portion 1A, making it easier to unwind. Specifically, the bonded negative electrode sheet 3 is easily peeled from the second diaphragm sheet 4.

[0223] However, even if the undecomposed portion 1A is wound onto the stripping roller 153, it is not always possible to separate the negative electrode laminate 3S from the positive electrode laminate 5S in one go. Therefore, in this embodiment, the undecomposed portion 1A is wound onto the stripping roller 153 repeatedly until the tension of the second diaphragm 4 becomes below a predetermined value (indicating that the negative electrode laminate 3S and the positive electrode laminate 5S have separated).

[0224] Return to Figure 9B When the rotation angle of the conveyor motor 142 reaches the predetermined rotation angle (if the result of step S180 is yes), in step S190, it is determined whether the tension of the second diaphragm 4 detected by the tension detection device 180 is below the predetermined value. If the tension of the second diaphragm 4 is below the predetermined value (if the result of step S190 is yes), the negative electrode laminate 3S and the positive electrode laminate 5S are separated by the first peel control. Therefore, the decomposition process of the electrode body 1 ends.

[0225] If the tension of the second diaphragm 4 exceeds a predetermined value (if the result of step S190 is negative), the negative electrode laminate 3S and the positive electrode laminate 5S do not separate due to the first peeling control. In this case, in step S200, the control of the conveyor motor 42 of the first conveyor section 40 is switched to constant speed control, and the control of the conveyor motor 142 of the second conveyor section 140 is switched to constant torque control. Through this control, the unseparated portion 1A is stretched to the left by the first conveyor section 40. As a result, the unseparated portion 1A is wound onto the peeling roller 153 while moving towards the first conveyor section 40.

[0226] In step S210, it is determined whether the conveyor motor 42 of the first conveying unit 40 has rotated by a predetermined rotation angle. In step S210, it can also be determined whether a predetermined time has elapsed since step S200. If the rotation angle of the conveyor motor 42 has not reached the predetermined rotation angle (if the result of step S210 is negative), constant speed control of the conveyor motor 42 and constant torque control of the conveyor motor 142 continue. When the rotation angle of the conveyor motor 42 reaches the predetermined rotation angle (if the result of step S210 is yes), in step S220, it is determined whether the tension of the second diaphragm 4 is below a predetermined value. If the tension of the second diaphragm 4 is below the predetermined value (if the result of step S220 is yes), the negative electrode laminate 3S and the positive electrode laminate 5S are separated by a second peeling control. Therefore, the decomposition process of the electrode body 1 ends.

[0227] If the tension of the second diaphragm 4 exceeds a predetermined value (if the result of step S220 is negative), the negative electrode laminate 3S and the positive electrode laminate 5S do not separate even through the second peeling control. In this case, in step 230, the control of the conveyor motor 42 of the first conveyor section 40 is switched to constant torque control, and the control of the conveyor motor 142 of the second conveyor section 140 is switched to constant speed control. Through this control, the unseparated portion 1A is stretched again by the second conveyor section 140 and moves to the right. As a result, the unseparated portion 1A is wound onto the peeling roller 153 while moving toward the second conveyor section 140.

[0228] In step S240, it is determined whether the conveyor motor 142 of the second conveyor section 140 has rotated by a predetermined rotation angle. In step S240, it can also be determined whether a predetermined time has elapsed since step S230. If the rotation angle of the conveyor motor 142 has not reached the predetermined rotation angle (if the result of step S240 is negative), constant torque control and constant speed control of the conveyor motor 142 continue. When the rotation angle of the conveyor motor 142 reaches the predetermined rotation angle (if the result of step S240 is positive), the process returns to step S190. At this time, the unseparated portion 1A is positioned at approximately the same position as at the end of step S180. Hereinafter, peeling control accompanied by the same reciprocating motion is repeated until the tension of the second diaphragm 4 becomes below a predetermined value. Steps S190 to S240 are an example of a reciprocating process in which the electrode body 1 is moved alternately in the stretching direction of the first diaphragm 2 and the stretching direction of the second diaphragm 4, causing the unseparated portion 1A of the electrode body 1 to be repeatedly wound around the peeling roller 153. Through these steps, the final electrode body 1 is decomposed into a negative electrode 3, a positive electrode 5, a first diaphragm 2, and a second diaphragm 4.

[0229] [Effects of the Implementation Method]

[0230] The effects of the electrode body decomposition apparatus 10 and the electrode body 1 decomposition method of this embodiment will be explained below.

[0231] The electrode body decomposition apparatus 10 of this embodiment includes: a first conveying section 40 that stretches a first diaphragm sheet 2; a second conveying section 140 that stretches a second diaphragm sheet 4; a peeling roller 153 disposed on the conveying path R2 of the second diaphragm sheet 4 to bend the conveying direction of the wound sheet; and a control device 100. It should be noted that the roller winding the undecomposed portion 1A of the electrode body 1 can also be disposed on the conveying path R1 of the first diaphragm sheet 2. The control device 100 is configured to control the first conveying section 40 and the second conveying section 140 to move the unwound portion (undecomposed portion 1A) of the electrode body 1 along the conveying path R2 of the second diaphragm sheet 4 and wind it onto the peeling roller 153. The electrode body 1 is a wound electrode body formed by sequentially stacking a strip-shaped first diaphragm sheet 2, a strip-shaped negative electrode sheet 3, a strip-shaped second diaphragm sheet 4, and a strip-shaped positive electrode sheet 5 and winding them along a predetermined winding direction. In addition, the negative electrode 3 is adhered to the first separator 2, and the positive electrode 5 is adhered to the second separator 4.

[0232] Furthermore, the method for disassembling the electrode body 1 in this embodiment includes: an electrode body preparation step S10 for preparing the electrode body 1; a positive and negative electrode separation step S20 for separating the electrode body 1 into a laminated sheet 3S of a first diaphragm sheet 2 and a negative electrode sheet 3 and a laminated sheet 5S of a second diaphragm sheet 4 and a positive electrode sheet 5 at the end of the winding of the electrode body 1; and a step of unwinding the electrode body 1 by stretching the first diaphragm sheet 2 and the second diaphragm sheet 4 respectively (here, the first diaphragm conveying step S50, the second diaphragm conveying step S150, and the steps of reciprocating peeling control S160 to S240). The step of unwinding the electrode body 1 includes winding the undisassembled portion 1A of the electrode body 1 onto a peeling roller 153 that bends the conveying direction of the wound sheet (here, the peeling control steps S160 to S240).

[0233] According to the electrode body disassembly device 10 and the electrode body 1 disassembly method, by winding the undisassembled portion 1A of the electrode body 1 onto the peeling roller 153, the force line F1 of the force stretching the first diaphragm 2 is made non-parallel to the force line F2 of the force stretching the second diaphragm. This generates a force that causes the electrode body 1 to rotate and unwind. Therefore, it is possible to more easily unwind difficult-to-unwind portions, such as the innermost circumference of the electrode body 1.

[0234] In this embodiment, the control device 100 is configured to alternately move the electrode body 1 in the stretching direction of the first conveying section 40 and the stretching direction of the second conveying section 140, and repeatedly wind the undecomposed portion 1A of the electrode body 1 onto the peeling roller 153. In the decomposition method of the electrode body 1 in this embodiment, the step of unwinding the electrode body 1 by stretching the first diaphragm sheet 2 and the second diaphragm sheet 4 respectively (first diaphragm conveying step S50, second diaphragm conveying step S150, and peeling control steps S160~S240) includes the following steps S190~S240: the electrode body 1 is moved alternately in the stretching direction of the first diaphragm sheet 2 and the stretching direction of the second diaphragm sheet 4, so that the undecomposed portion 1A of the electrode body 1 is repeatedly wound onto the peeling roller 153.

[0235] According to the electrode body decomposition device 10 and the electrode body 1 decomposition method, by repeatedly winding the undecomposed part 1A of the electrode body 1 onto the stripping roller 153, the difficult-to-unwind part of the electrode body 1 can be unwound.

[0236] In this embodiment, the control device 100 repeatedly performs the following controls: constant torque control on the first conveying section 40 and constant speed control on the second conveying section 140; and constant speed control on the first conveying section 40 and constant torque control on the second conveying section 140. According to this structure, by performing constant torque control on one of the first conveying section 40 and the second conveying section 140 and constant speed control on the other, the electrode body 1 is moved in the stretching direction of the conveying section 40 or 140 based on the constant speed control. By repeatedly performing the above actions while changing direction, the electrode body 1 can be reciprocated.

[0237] The electrode body disassembly apparatus 10 of this embodiment also includes a tension detection device 180 for detecting the tension of the second diaphragm sheet 4 stretched by the second conveying section 140. After the tension detected by the tension detection device 180 exceeds a predetermined tension, the control device 100 winds the electrode body 1 onto the peeling roller 153. According to this structure, based on the condition that the tension of the second diaphragm sheet 4 exceeds a predetermined value, it is possible to detect that stretching the second diaphragm sheet 4 no longer allows the electrode body 1 to be unwound. Through this detection, the timing for initiating peeling control can be determined. It should be noted that the tension detection device 180 can also detect the tension of the first diaphragm sheet 2 stretched by the first conveying section 40.

[0238] In this embodiment, a stripping roller 153 is disposed on the transport path R2 of the second diaphragm sheet 4. A positive electrode laminate 5S is wound onto the stripping roller 153. The stripping roller 153 separates the second diaphragm sheet 4 from the positive electrode sheet 5 by bending the transport path R2 of the second diaphragm sheet 4. The electrode body 1 disassembly method of this embodiment includes a positive electrode separation step S130, in which the positive electrode laminate 5S is wound onto the stripping roller 153, bending the transport path R2 of the second diaphragm sheet 4, and separating the second diaphragm sheet 4 from the positive electrode sheet 5. According to this electrode body disassembly apparatus 10 and the electrode body 1 disassembly method, the roller used to unwind the electrode body 1 and the roller used to separate the second diaphragm sheet 4 from the positive electrode sheet 5 can be shared (here, this is achieved by sharing the stripping roller 153).

[0239] [Other Implementation Methods]

[0240] The above describes one embodiment of the electrode body disintegration apparatus and disintegration method proposed herein. However, the above embodiment is merely an example, and it may be implemented in other ways.

[0241] For example, in the above embodiment, the negative electrode laminate 3S and the positive electrode laminate 5S of the unseparated portion 1A are peeled off using the peeling roller 153 that separates the second diaphragm sheet 4 from the positive electrode sheet 5, but other rollers may also be used for peeling. The roller may be a roller specifically for peeling control, or it may be shared with rollers for other purposes. The configuration of the roller used in peeling control is not limited. For example, the roller used in peeling control may also be provided on the conveying path R1 of the positive electrode laminate 5S.

[0242] In the above embodiment, peeling control is repeatedly performed until the tension of the second diaphragm 4 falls below a predetermined value, but it can also be performed only once. In this case, peeling control can be performed, for example, as follows: with the unseparated portion 1A wound on the roller, the first conveying section 40 or the second conveying section 140 is stopped, and the second conveying section 140 or the first conveying section 40 is used to stretch the second diaphragm 4 or the first diaphragm 2 until the tension of the first diaphragm 2 or the second diaphragm 4 falls below a predetermined value.

[0243] In the above embodiment, the transport path R1 of the first diaphragm 2 and the transport path R2 of the second diaphragm 4 separate to the left and right from the electrode housing portion 20, but the transport path R1 of the first diaphragm 2 and the transport path R2 of the second diaphragm 4 are not particularly limited. The transport path R1 of the first diaphragm 2 and the transport path R2 of the second diaphragm 4 immediately separate in opposite directions after branching, but for example, they may bend downstream of the branch so that the negative electrode 3 and the positive electrode 5 are recovered on the same side.

[0244] The structure of the first moving device 32 and the second moving device 132 is not particularly limited. For example, the first moving device 32 and the second moving device 132 can also move the first gripper 31 and the second gripper 131 along a guide rail laid on a predetermined track. For example, the first moving device 32 and the second moving device 132 can also be a multi-axis robot.

[0245] The bending roller 51, upstream roller 151, downstream roller 152, and stripping roller 153 may also remain stationary. The stripping roller 153 does not need to move to collide with the second diaphragm 4, and its position can also be fixed.

[0246] Furthermore, the above embodiments are not limited to the present invention except where specifically mentioned. Additionally, the technology disclosed herein can be modified in various ways. Various components and processes mentioned herein can be appropriately omitted or combined without causing particular problems. This specification includes the disclosures described below.

[0247] Item 1:

[0248] A method for disassembling an electrode body, wherein the method for disassembling the electrode body includes:

[0249] The preparation process involves preparing an electrode body by sequentially stacking and winding a strip-shaped first diaphragm, a strip-shaped negative electrode, a strip-shaped second diaphragm, and a strip-shaped positive electrode along a specified winding direction.

[0250] In the first separation step, at the end of the winding of the electrode body, the electrode body is separated into the first diaphragm and the negative electrode, and the second diaphragm and the positive electrode; and

[0251] The unwinding process involves unwinding the electrode body by stretching the first diaphragm and the second diaphragm respectively.

[0252] The unwinding process includes winding the unwound portion of the electrode body onto a roller that bends the winding sheet in the transport direction.

[0253] Item 2:

[0254] According to the method for disassembling the electrode body as described in item 1, the unwinding process includes a reciprocating process in which the electrode body is moved alternately in the stretching direction of the first diaphragm and the stretching direction of the second diaphragm, so that the unwound portion of the electrode body is repeatedly wound onto the roller.

[0255] Item 3:

[0256] According to the method for disassembling the electrode body as described in item 2, in the reciprocating process, the following controls are repeatedly performed: a constant torque control is performed on the first stretching device for stretching the first diaphragm and a constant speed control is performed on the second stretching device for stretching the second diaphragm; and a constant speed control is performed on the first stretching device and a constant torque control is performed on the second stretching device.

[0257] Item 4:

[0258] The method for disassembling an electrode body according to any one of claims 1 to 3, wherein the electrode body is wound onto the roller after the tension during stretching the first diaphragm or the tension during stretching the second diaphragm exceeds a predetermined tension.

[0259] Item 5:

[0260] The method for disassembling an electrode body according to any one of items 1 to 4 further includes a second separation step, in which the stacked sheet of the second diaphragm and the positive electrode is wound around the roller to bend the transport path of the second diaphragm and separate the second diaphragm from the positive electrode.

[0261] Item 6:

[0262] An electrode body disassembly apparatus is provided for disassembling an electrode body formed by sequentially stacking and winding a strip-shaped first diaphragm, a strip-shaped negative electrode, a strip-shaped second diaphragm, and a strip-shaped positive electrode along a predetermined winding direction. The electrode body disassembly apparatus comprises:

[0263] A first stretching device stretches the first diaphragm;

[0264] The second stretching device stretches the second diaphragm;

[0265] A roller, disposed on the conveying path of the first or second diaphragm, bending the conveying direction of the wound sheet; and

[0266] Control device,

[0267] The control device is configured to control the first stretching device and the second stretching device to move the unwound portion of the electrode body along the conveying path of the first diaphragm or the second diaphragm and to wind it onto the roller.

[0268] Item 7:

[0269] According to the electrode body disassembly apparatus of item 6, the control device causes the electrode body to move alternately in the stretching direction of the first stretching device and the stretching direction of the second stretching device, and repeatedly winds the unwound portion of the electrode body onto the roller.

[0270] Item 8:

[0271] According to the electrode body disassembly apparatus of item 7, the control device repeatedly performs the following control: constant torque control on the first stretching device and constant speed control on the second stretching device; and constant speed control on the first stretching device and constant torque control on the second stretching device.

[0272] Item 9:

[0273] The electrode body disassembly apparatus according to any one of claims 6 to 8 further comprises a detection device that detects the tension of the first diaphragm stretched by the first stretching device or the tension of the second diaphragm stretched by the second stretching device.

[0274] After the tension detected by the detection device exceeds a predetermined tension, the control device winds the electrode body onto the roller.

[0275] Item 10:

[0276] According to any one of claims 6 to 9, the electrode body disassembly apparatus, wherein the roller is disposed on the transport path of the second diaphragm, the laminate of the second diaphragm and the positive electrode is wound on the roller, and the roller separates the second diaphragm from the positive electrode by bending the transport path of the second diaphragm.

Claims

1. A method for disassembling an electrode, wherein, The method for disassembling the electrode body includes: The preparation process involves preparing an electrode body by sequentially stacking and winding a strip-shaped first diaphragm, a strip-shaped negative electrode, a strip-shaped second diaphragm, and a strip-shaped positive electrode along a specified winding direction. In the first separation step, at the end of the winding of the electrode body, the electrode body is separated into the first diaphragm and the negative electrode, and the second diaphragm and the positive electrode; and The unwinding process involves unwinding the electrode body by stretching the first diaphragm and the second diaphragm respectively. The unwinding process includes winding the unwound portion of the electrode body onto a roller that bends the winding sheet in the transport direction.

2. The method for disassembling the electrode body as described in claim 1, wherein, The unwinding process includes a reciprocating process in which the electrode body is moved alternately in the stretching direction of the first diaphragm and the stretching direction of the second diaphragm, so that the unwound portion of the electrode body is repeatedly wound onto the roller.

3. The method for disassembling the electrode body as described in claim 2, wherein, In the reciprocating process, the following controls are repeatedly performed: constant torque control is applied to the first stretching device that stretches the first diaphragm and constant speed control is applied to the second stretching device that stretches the second diaphragm; and constant speed control is applied to the first stretching device and constant torque control is applied to the second stretching device.

4. The method for disassembling the electrode body as described in claim 1, wherein, After the tension during stretching the first diaphragm or the tension during stretching the second diaphragm exceeds a predetermined tension, the electrode body is wound onto the roller.

5. The method for disassembling the electrode body as described in claim 1, wherein, The method for disassembling the electrode body further includes a second separation step, in which the stacked sheets of the second diaphragm and the positive electrode are wound around the roller to bend the conveying path of the second diaphragm and separate the second diaphragm from the positive electrode.

6. An electrode body disassembly apparatus for disassembling an electrode body formed by sequentially stacking and winding a strip-shaped first diaphragm, a strip-shaped negative electrode, a strip-shaped second diaphragm, and a strip-shaped positive electrode along a predetermined winding direction, wherein, The electrode body disintegration device includes: A first stretching device stretches the first diaphragm; The second stretching device stretches the second diaphragm; A roller, which is disposed on the conveying path of the first diaphragm or the second diaphragm, bends the conveying direction of the wound sheet; as well as Control device, The control device is configured to control the first stretching device and the second stretching device to move the unwound portion of the electrode body along the conveying path of the first diaphragm or the second diaphragm and to wind it onto the roller.

7. The electrode disassembly apparatus as described in claim 6, wherein, The control device causes the electrode to move alternately in the stretching direction of the first stretching device and the stretching direction of the second stretching device, and repeatedly winds the unwound portion of the electrode onto the roller.

8. The electrode disassembly apparatus as described in claim 7, wherein, The control device repeatedly performs the following controls: constant torque control on the first stretching device and constant speed control on the second stretching device; and constant speed control on the first stretching device and constant torque control on the second stretching device.

9. The electrode body disassembly apparatus as described in claim 6, wherein, The electrode body disassembly device further includes a detection device that detects the tension of the first diaphragm stretched by the first stretching device or the tension of the second diaphragm stretched by the second stretching device. After the tension detected by the detection device exceeds a predetermined tension, the control device winds the electrode body onto the roller.

10. The electrode body disassembly apparatus as claimed in claim 6, wherein, The roller is positioned on the conveying path of the second diaphragm, and the laminate of the second diaphragm and the positive electrode is wound on the roller. The roller separates the second diaphragm from the positive electrode by bending the conveying path of the second diaphragm.

Images