Apparatus for manufacturing power storage device

Abstract

This apparatus for manufacturing a power storage device is provided with a reel, a first conveyance device, a second conveyance device, a first laser tab cutting device, a second laser tab cutting device, a winding device, and a control device. The control device is configured to execute: a first process of acquiring a tab pitch of a positive electrode sheet wound around a reel; a second process for acquiring the tab pitch of the negative electrode sheet wound around the reel; a third process for adjusting the gap between the tabs on the basis of the tab pitch of the positive electrode sheet obtained in the first process; and a fourth process for adjusting the tab spacing on the basis of the tab pitch of the negative electrode sheet obtained in the second process.

Description

Technical Field

[0001] The present invention relates to an apparatus for manufacturing an electric storage device. Background Art

[0002] Japanese Patent No. 5572676 discloses a winding device for winding a strip-shaped sheet having a plurality of stacked portions intermittently formed along the long side direction of the sheet. The winding device comprises a winding core, a first pressing unit, a detection unit, a position adjustment unit and a second pressing unit. The winding core is arranged to be rotatable. The first pressing unit is arranged to press the sheet wound onto the winding core and to be able to rotate integrally with the winding core. The detection unit detects the position of the end of the stacked portion on the sheet wound onto the winding core in the long side direction of the sheet. The position adjustment unit is configured to hold the sheet wound onto the winding core and to be able to move at least along the sheet winding direction. In addition, the position adjustment unit aligns the position of the end of the stacked portion on the sheet in the long side direction of the sheet with a pre-set reference position based on the detection result of the detection unit. The second pressing unit presses the sheet in the aligned state. According to this winding device, the positions of the plurality of stacked portions can be aligned with high precision.

[0003] Patent Document 1: Japanese Patent No. 5572676 Summary of the invention

[0004] The present inventors have considered trying to improve the positional accuracy of the electrode tabs of an electrical storage device.

[0005] The manufacturing device of the storage device disclosed herein comprises a reel, a first conveying device, a first laser tab cutting device, a second conveying device, a second laser tab cutting device, a winding device, and a control device. The first conveying device conveys a strip-shaped positive electrode sheet toward the reel. The first laser tab cutting device forms tabs at predetermined intervals on the positive electrode sheet conveyed by the first conveying device. The second conveying device conveys a strip-shaped negative electrode sheet toward the reel. The second laser tab cutting device forms tabs at predetermined intervals on the negative electrode sheet conveyed by the second conveying device. The winding device rotates the reel to wind up the positive electrode sheet with tabs formed by the first laser tab cutting device and the negative electrode sheet with tabs formed by the second laser tab cutting device. The positive electrode sheet comprises a strip-shaped positive electrode collector foil and a positive electrode active material layer formed in an area of ​​the strip-shaped positive electrode collector foil except for an unformed area of ​​the first edge portion set in the width direction. The negative electrode sheet has a strip-shaped negative electrode collector foil, and a negative electrode active material layer formed in an area of ​​the strip-shaped negative electrode collector foil except for an unformed area of ​​a first edge portion set in a width direction. The control device is configured to perform: a first process to obtain the tab spacing of the positive electrode sheet wound on the reel relative to the rotation angle of the reel; a second process to obtain the tab spacing of the negative electrode sheet wound on the reel relative to the rotation angle of the reel; a third process, based on the tab spacing of the positive electrode sheet wound on the reel relative to the rotation angle of the reel obtained in the first process, the first laser tab cutting device adjusts the spacing of the tabs formed on the positive electrode sheet; and a fourth process, based on the tab spacing of the negative electrode sheet wound on the reel relative to the rotation angle of the reel obtained in the second process, the second laser tab cutting device adjusts the spacing of the tabs formed on the negative electrode sheet. In the manufacturing device of the power storage device, the position accuracy of the electrode tabs is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a cross-sectional view of the power storage device 1 .

[0007] Figure 2 is a schematic diagram of the wound electrode body 20 .

[0008] Figure 3 Schematic diagram showing an electrical storage device manufacturing apparatus 100 .

[0009] Figure 4 is a schematic diagram of the scroll 110 .

[0010] Figure 5 It is a schematic diagram of the positive electrode sheet 21 formed with the tab 21d.

[0011] Figure 6 It is a block diagram showing the processing executed by the control device 180 .

[0012] Figure 7Schematic diagram showing the first tab detection device 201 .

[0013] Figure 8 It is a block diagram showing a process executed by the control device 180 according to another embodiment.

[0014] Fig. 9 It is a schematic diagram showing the image inspection devices 204 and 205.

[0015] Fig.10 2 is a schematic diagram showing the image inspection device 206 .

[0016] Fig.11 It is a schematic diagram showing the wound body 20a after the preliminary punching.

[0017] Fig.12 It is a block diagram showing a process executed by the control device 180 according to another embodiment.

[0018] Fig.13 2 is a schematic diagram showing the thickness inspection device 207 .

[0019] Fig.14 It is a block diagram showing a process executed by the control device 180 according to another embodiment.

[0020] Fig.15 It is a block diagram showing a process executed by the control device 180 according to another embodiment.

[0021] Fig.16 It is a block diagram showing a process executed by the control device 180 according to another embodiment.

[0022] Fig.17 It is a block diagram showing a process executed by the control device 180 according to another embodiment. DETAILED DESCRIPTION

[0023] Hereinafter, an embodiment of the technology disclosed herein will be described with reference to the accompanying drawings. The embodiments described herein are of course not intended to specifically limit the present invention. The drawings are schematically depicted and do not necessarily reflect the actual objects. In addition, the same reference numerals are appropriately marked for components and parts that play the same role, and repeated descriptions are appropriately omitted.

[0024] Figure 1 is a cross-sectional view of the power storage device 1. Figure 1, the electrical storage device 1 is schematically illustrated in such a manner that the wide surface of the front side of the casing 10 is virtually removed so that the inside of the casing 10 can be seen. The electrical storage device 1 is one form of an electrical storage device manufactured by the electrical storage device manufacturing apparatus 100 disclosed herein, and a wound electrode body 20 is accommodated inside the casing 10. The electrical storage device manufactured by the electrical storage device manufacturing apparatus disclosed herein is not limited to Figure 1 The form shown.

[0025] 《Electrical Storage Equipment 1》

[0026] The power storage device 1 is a horizontally long square power storage device. Figure 1 As shown, the power storage device 1 includes a case 10 , a wound electrode body 20 , a positive electrode terminal 50 , and a negative electrode terminal 60 . The case 10 includes a case main body 11 and a lid 12 .

[0027] <Casing body 11>

[0028] The housing body 11 is a square housing with a bottom and has a horizontally long rectangular storage space. The housing body 11 mainly stores the wound electrode body 20. The housing body 11 has a substantially rectangular bottom surface, a pair of wide width surfaces facing each other along the long side of the bottom surface, and a pair of narrow width surfaces facing each other along the short side of the bottom surface. An opening 11f for storing the wound electrode body 20 is formed on the surface facing the bottom surface. The cover 12 is installed on the opening 11f.

[0029] 〈Cover 12〉

[0030] The cover 12 is mounted on the opening 11f of the housing 10. The cover 12 is composed of a substantially rectangular plate material that can be mounted on the opening 11f of the housing body 11. The cover 12 is a substantially rectangular plate material. The cover 12 has a mounting hole 12a for mounting the positive terminal 50 formed on one side in the long side direction, and a mounting hole 12b for mounting the negative terminal 60 formed on the opposite side.

[0031] The cover 12 is provided with an injection hole 12c and a gas discharge valve 12d. The injection hole 12c is a through hole provided for injecting a non-aqueous electrolyte into the sealed housing 10. The injection hole 12c is sealed by installing a sealing member 12e after the injection of the non-aqueous electrolyte. In addition, the gas discharge valve 12d is a thin-walled portion designed to rupture (open) when a large amount of gas is generated in the housing 10 to discharge the gas.

[0032] The nonaqueous electrolyte solution may be any nonaqueous electrolyte solution used in conventionally known power storage devices without particular limitation. For example, the nonaqueous electrolyte solution may be prepared by dissolving a supporting salt in a nonaqueous solvent.

[0033] <Positive terminal 50, negative terminal 60>

[0034] The positive electrode terminal 50 and the negative electrode terminal 60 are attached to the cover 12. The wound electrode body 20 is housed in the case body 11 in a state where the positive electrode terminal 50 and the negative electrode terminal 60 are attached. The positive electrode terminal 50 includes an external connection portion 51 and an axis portion 52. The negative electrode terminal 60 includes an external connection portion 61 and an axis portion 62. The positive electrode terminal 50 and the negative electrode terminal 60 are connected to the cover 12 via an insulator 70, respectively. The positive electrode terminal 50 and the negative electrode terminal 60 are connected to internal terminals 53 and 63, respectively, provided in the case 10.

[0035] On the outside of the cover 12, external connection parts 51 and 61 are arranged with an insulator 70 sandwiched therebetween. On the inside of the cover 12, internal terminals 53 and 63 are mounted with a gasket 80 sandwiched therebetween. The insulator 70 and the gasket 80 are insulating materials. The insulator 70 and the gasket 80 are resins having the required rigidity. The internal terminals 53 and 63 have mounting holes, respectively, and are connected to the shafts 52 and 62 of the positive terminal 50 and the negative terminal 60. The lower ends of the shafts 52 and 62 are riveted near the mounting holes of the internal terminals 53 and 63.

[0036] The positive electrode terminal 50 and the negative electrode terminal 60 are attached to the lid 12 in a state of being electrically insulated via the insulator 70 and the gasket 80 and in a state of ensuring airtightness. The positive electrode terminal 50 and the negative electrode terminal 60 are connected to the wound electrode body 20 via the internal terminals 53 and 63. The wound electrode body 20 is housed in the case body 11 in a state of being attached to the lid 12 in this way. A plurality of wound electrode bodies 20 may be attached to one lid 12, or a plurality of wound electrode bodies 20 may be housed in one case 10.

[0037] <Wound Electrode Body 20>

[0038] Figure 2 Schematic diagram of the wound electrode body 20. Figure 2 , the wound electrode body 20 is illustrated in a state where one end is unfolded. Figure 2 As shown, for the wound electrode body 20, the long strip-shaped positive electrode sheet 21, the first separator 31, the negative electrode sheet 22, and the second separator 32 are stacked in order so that the long sides are aligned, and are wound around a winding axis WL set in the width direction. The positive electrode sheet 21 and the negative electrode sheet 22 are also called positive electrode plates and negative electrode plates, respectively.

[0039] The positive electrode sheet 21 includes a strip-shaped positive electrode current collector foil 21a, a positive electrode active material layer 21b, and a tab 21d. The positive electrode current collector foil 21a is a substrate of the positive electrode sheet 21. The positive electrode current collector foil 21a is formed of a predetermined metal foil (e.g., aluminum foil). Figure 2 The first edge 21a1 is set at the left side of the Figure 2A second edge 21a2 is set in the right side of the positive electrode collector foil 21a in the width direction. An unformed region 21a3 is set in the first edge 21a1 in the width direction of the strip-shaped positive electrode collector foil 21a. The positive electrode active material layer 21b is formed in a region other than the unformed region 21a3. The positive electrode active material layer 21b is formed with a constant width at the end of the positive electrode collector foil 21a on one side in the width direction. A protective layer 21c containing insulating ceramic particles may also be formed in a portion of the positive electrode collector foil 21a other than the portion where the positive electrode active material layer 21b is formed. On the positive electrode collector foil 21a, a tab 21d protruding in the width direction is formed on the side where the protective layer 21c is formed. The tab 21d is a portion protruding locally with a predetermined width on the side where the protective layer 21c is formed. The positive electrode collector foil 21a is exposed at the tab 21d. In addition, the protective layer 21c is not an essential component of the positive electrode sheet.

[0040] The positive electrode active material layer 21b is a layer containing a positive electrode active material. In a lithium-ion secondary battery, the positive electrode active material is a material that can release lithium ions during charging, such as a lithium transition metal composite material, and can absorb lithium ions during discharge. In addition to the lithium transition metal composite material, various positive electrode active materials are generally proposed, and are not particularly limited.

[0041] The negative electrode sheet 22 includes a strip-shaped negative electrode current collector foil 22a, a negative electrode active material layer 22b, and a tab 22d. The negative electrode current collector foil 22a is a base material of the negative electrode sheet 22. The negative electrode current collector foil 22a is formed of a predetermined metal foil (e.g., copper foil). Figure 2 The first edge 22a1 is set at the left side of the Figure 2 A second edge 22a2 is set on the right side in the width direction. An unformed region 22a3 is set on the first edge 22a1 in the width direction of the strip-shaped negative electrode collector foil 22a. The negative electrode active material layer 22b is formed in a region other than the unformed region 22a3. The negative electrode active material layer 22b is formed with a constant width at the end of the negative electrode collector foil 22a on one side in the width direction. A tab 22d protruding to one side in the width direction is formed on the negative electrode collector foil 22a. The tab 22d is a portion that protrudes partially outward with a predetermined width on the side where the unformed region 22a3 is provided. At the tab 22d, the negative electrode collector foil 22a is exposed.

[0042] In this embodiment, the positive electrode sheet 21 and the negative electrode sheet 22 are provided with unformed areas 21a3 and 22a3 at the first edge 21a1 and 22a1 on the same side, but the present invention is not limited to this form. The unformed areas 21a3 and 22a3 may also be provided at the second edge 21a2 and 22a2 of the positive electrode sheet 21 and the negative electrode sheet 22. It may also be configured such that: in the unformed areas 21a3 and 22a3, one is provided at the first edge 21a1 and 22a1, and the other is provided at the second edge 21a2 and 22a2. In this case, the tabs 21d and 22d can protrude from the positive electrode sheet 21 and the negative electrode sheet 22 in different directions (for example, opposite directions), respectively.

[0043] The negative electrode active material layer 22b is a layer containing a negative electrode active material. The negative electrode active material is not particularly limited as long as it can reversibly absorb and release charge carriers in the relationship with the above-mentioned positive electrode active material. Examples of the negative electrode active material include carbon materials, silicon-based materials, and the like.

[0044] like Figure 2 As shown, the negative electrode active material layer 22b of the negative electrode sheet 22 only needs to cover the positive electrode active material layer 21b of the positive electrode sheet 21 in a state where the separators 31 and 32 are sandwiched. The separators 31 and 32 only need to cover the positive electrode active material layer 21b of the positive electrode sheet 21 and the negative electrode active material layer 22b of the negative electrode sheet 22. In addition, although not shown in the figure, the lengths of the positive electrode sheet 21, the negative electrode sheet 22, and the separators 31 and 32 are such that the separators 31 and 32>the negative electrode sheet 22>the positive electrode sheet 21. The width La of the positive electrode active material layer 21b, the width Ln of the negative electrode active material layer 22b, and the width Ls of the separators 31 and 32 are such that Ls>Ln>La. In the portion where the positive electrode sheet 21 and the negative electrode sheet 22 overlap, the portion where the positive electrode active material layer 21b is formed is covered by the negative electrode active material layer 22b. In addition, a protective layer 21 c is formed on the portion of the positive electrode sheet 21 where the negative electrode active material layer 22 b overlaps and where the positive electrode active material layer 21 b does not face the positive electrode active material layer 21 b .

[0045] like Figure 2 As shown, the tab 21d of the positive electrode sheet 21 extends to one side in the width direction of the separators 31 and 32. In the positive electrode sheet 21, a plurality of tabs 21d are arranged at a predetermined pitch in the long side direction. The tab 22d of the negative electrode sheet 22 extends from the separators 31 and 32 on the same side as the side from which the tab 21d of the positive electrode sheet 21 extends. In the negative electrode sheet 22, a plurality of tabs 22d are arranged at a predetermined pitch in the long side direction. The plurality of tabs 21d of the positive electrode sheet 21 are arranged at a predetermined pitch in a manner that they are in substantially the same position after being wound on the wound electrode body 20. The plurality of tabs 22d of the negative electrode sheet 22 are arranged at a predetermined pitch in a manner that they are in substantially the same position after being wound on the wound electrode body 20.

[0046] like Figure 1 and Figure 2 As shown, the wound electrode body 20 is accommodated in the housing body 11 from the opening 11f of the mounting cover 12. Therefore, it is a flat shape corresponding to the shape of the opening 11f. When the wound electrode body 20 is manufactured, it can also be wound around a flat axis during the winding. In addition, when the wound electrode body 20 is manufactured, it can also be stamped into a flat shape after being wound around a cylindrical axis. The wound electrode body 20 and the housing body 11 are electrically insulated by a resin insulating sheet (not shown) arranged between the wound electrode body 20 and the housing body 11.

[0047] In addition, as a method for manufacturing a wound electrode body for an electrical storage device, a method of preparing a positive electrode sheet and a negative electrode sheet with a tab formed thereon and winding them can be considered. For example, when preparing the positive electrode sheet and the negative electrode sheet, the tabs are formed on the positive electrode sheet and the negative electrode sheet according to the pre-set processing conditions. After preparing the positive electrode sheet and the negative electrode sheet with the tabs formed thereon, the positive electrode sheet and the negative electrode sheet are wound on a reel through a separator. In response to this, the inventors considered cutting the positive electrode sheet and the negative electrode sheet with a laser, forming the tabs while winding them. In addition, according to the inventors' insights, when winding the positive electrode sheet and the negative electrode sheet, the tabs are not necessarily overlapped at a constant position, and the position of the tabs can deviate within a predetermined allowable range. When the deviation in the in-plane thickness of the positive electrode sheet and the negative electrode sheet is large, etc., the tabs may deviate beyond the predetermined allowable range. In addition, there is a case where the tabs deviate due to the processing (stamping, etc.) of the wound body after winding. In particular, as the size of the wound electrode body increases and the number of windings increases, the tabs tend to become more misaligned.

[0048] <<Electricity Storage Device Manufacturing Apparatus 100>>

[0049] The electric storage device manufacturing apparatus 100 is an apparatus for manufacturing the electric storage device 1 . Figure 3 Schematic diagram showing an electrical storage device manufacturing apparatus 100 . Figure 4 is a schematic diagram of the scroll 110. Figure 3 As shown, the manufacturing apparatus 100 of the storage device includes a reel 110, a first conveying device 120, a second conveying device 130, third conveying devices 140 and 141, a first laser tab cutting device 150, a second laser tab cutting device 160, a winding device 170, and a control device 180. The storage device manufacturing apparatus 100 may also include a punching device 200.

[0050] In the manufacturing device 100 of the storage device, the positive electrode sheet 21, the negative electrode sheet 22 and the separators 31 and 32 are respectively transported by the first transport device 120, the second transport device 130 and the third transport devices 140 and 141. For the positive electrode sheet 21 and the negative electrode sheet 22, during transportation, the tabs 21d and 22d are formed by the first laser tab cutting device 150 and the second laser tab cutting device 160. The positive electrode sheet 21 and the negative electrode sheet 22 formed with the tabs 21d and 22d are wound on the reel 110 by the winding device 170 to form a winding body 20a. In this way, in the manufacturing device 100 of the storage device, the tabs 21d and 22d are formed on the positive electrode sheet 21 and the negative electrode sheet 22 while being wound. The following describes each device.

[0051] Scroll 110

[0052] like Figure 4 As shown, the reel 110 is a shaft member for winding up the positive electrode sheet 21, the negative electrode sheet 22, and the separators 31, 32. The positive electrode sheet 21 and the negative electrode sheet 22 are wound up with the separators 31, 32 interposed therebetween.

[0053] In this embodiment, the reel 110 is a substantially cylindrical shaft-shaped component. The shape of the reel 110 is not particularly limited, and the cross-section may be a perfect circle or a flat shape. In this embodiment, a slit 111 is formed on the reel 110. The slit 111 is formed in a manner passing through the central axis (winding axis) of the reel 110. The reel 110 is a shape divided radially by the slit 111. In addition, the reel 110 may not necessarily be formed with a slit.

[0054] In addition, various additional structures may also be provided on the reel 110. For example, a structure for sucking the sheet body (in this embodiment, the positive electrode sheet 21, the negative electrode sheet 22 and the separators 31 and 32) wound onto the reel 110 may also be provided on the reel 110. A space that is negatively pressurized relative to the outside may also be formed inside the reel 110. A hole that passes through from the space toward the surface of the reel 110 may also be formed on the reel 110. The hole can function as a suction hole for sucking the sheet body wound onto the reel 110. Thus, when the sheet body is wound, the position of the sheet body is not easily deviated. In addition, a groove that serves as an escape portion when the sheet body wound onto the reel 110 is cut may also be provided on the reel 110. For example, after the sheet body is wound onto the reel 110, when the sheet body is cut, the blade of the tool can fall into the groove. Thus, when the sheet body is cut, the reel 110 and the blade of the tool are not easily damaged.

[0055] The positive electrode sheet 21, the negative electrode sheet 22, and the separators 31 and 32 are mounted on the reel 110. The separators 31 and 32 are mounted on the reel 110 so that the positive electrode sheet 21 and the negative electrode sheet 22 are not in contact with each other. The positive electrode sheet 21, the negative electrode sheet 22, and the separators 31 and 32 can also be fixed to the reel 110 by clamping their respective front ends with the slits 111. The reel 110 is wound by a winding device 170 (see Figure 3 ) is driven to rotate in the circumferential direction.

[0056] <Reeling device 170>

[0057] The winding device 170 is a device that rotates the winding shaft 110. The winding shaft 110 is rotated by the winding device 170, so that the positive electrode sheet 21 and the negative electrode sheet 22 are wound on the winding shaft 110. The winding device 170 is not particularly limited as long as it can rotate the winding shaft 110. As the winding device 170, for example, a motor can be used.

[0058] The positive electrode sheet 21 and the negative electrode sheet 22 are wound on the reel 110 in such a manner that the tabs 21d and 22d are arranged at positions predetermined at a rotation angle relative to the reel 110. The positive electrode sheet 21 and the negative electrode sheet 22 are wound on the reel 110 in such a manner that the tabs 21d of the positive electrode sheet 21 and the tabs 22d of the negative electrode sheet 22 overlap in the radial direction, respectively. In this embodiment, for the tabs 21d of the positive electrode sheet 21 and the tabs 22d of the negative electrode sheet 22, the positions of the tabs 21d and 22d are set in such a manner that they overlap at different positions in the circumferential direction, respectively. In this embodiment, the positive electrode sheet 21 and the negative electrode sheet 22 are wound in such a manner that the tabs 21d and 22d overlap at a predetermined angle relative to the reference line of the reel 110. In addition, the reference line of the reel 110 can be any line along the radial direction of the reel 110. In this embodiment, the positive electrode tab 21d and the negative electrode tab 22d overlap at positions symmetrical to each other with the slit 111 interposed therebetween. The overlapped positive electrode tab 21d and negative electrode tab 22d are respectively arranged at two locations in the circumferential direction.

[0059] like Figure 3 As shown, on the reel 110 , the positive electrode sheet 21 , the negative electrode sheet 22 , and the separators 31 , 32 are transported by the first transport device 120 , the second transport device 130 , and the third transport devices 140 , 141 , respectively.

[0060] <First transport device 120, second transport device 130, third transport devices 140, 141>

[0061] The first conveying device 120 conveys the strip-shaped positive electrode sheet 21 toward the reel 110 . The second conveying device 130 conveys the strip-shaped negative electrode sheet 22 toward the reel 110 . The third conveying devices 140 and 141 convey the strip-shaped separators 31 and 32 toward the reel 110 .

[0062] The positive electrode sheet 21, the negative electrode sheet 22, and the separators 31, 32 are respectively wound on the unwinding shafts 122, 132, 142, 143. The first conveying device 120, the second conveying device 130, and the third conveying device 140, 141 are connected to the unwinding shafts 122, 132, 142, 143, respectively. The positive electrode roll 124, the negative electrode roll 134, and the separator rolls 144, 145 are respectively wound on the unwinding shafts 122, 132, 142, 143. The positive electrode roll 124 is a roll wound with the strip-shaped positive electrode sheet 21 before the tab 21d is formed. The negative electrode roll 134 is a roll wound with the strip-shaped negative electrode sheet 22 before the tab 22d is formed. The separator rolls 144, 145 are rolls wound with the strip-shaped separators 31, 32, respectively.

[0063] The first conveying device 120, the second conveying device 130, and the third conveying device 140, 141 drive and rotate the unwinding shafts 122, 132, 142, 143, respectively. As a result, the positive electrode roll 124, the negative electrode roll 134, and the separator rolls 144, 145 are respectively unwound from the unwinding shafts 122, 132, 142, 143. The first conveying device 120, the second conveying device 130, and the third conveying device 140, 141 are not particularly limited as long as they can rotate the unwinding shafts 122, 132, 142, 143. For example, a motor or the like can be used as the first conveying device 120, the second conveying device 130, and the third conveying device 140, 141.

[0064] The conveying speed can be controlled according to the conveying conditions set by the control device 180. The positive electrode sheet 21, the negative electrode sheet 22 and the separators 31, 32 can be conveyed to the reel 110 at a substantially constant speed by the first conveying device 120, the second conveying device 130, and the third conveying devices 140, 141, respectively. The positive electrode sheet 21, the negative electrode sheet 22 and the separators 31, 32 can be conveyed along a pre-set conveying path, respectively. The conveying path can also be set by, for example, a clamping roller, a pressure accumulator, a tension roller, a guide roller, etc. A first laser tab cutting processing device 150 can also be provided in the conveying path of the positive electrode sheet 21. A second laser tab cutting processing device 160 is provided in the conveying path of the negative electrode sheet 22. In this embodiment, if a winding body 20a with a predetermined number of windings is made, the conveying of the sheet body is stopped. When a new sheet is mounted on the reel 110, the sheet is conveyed by the first conveying device 120, the second conveying device 130, and the third conveying devices 140 and 141. Tab processing is started on the conveyed positive electrode sheet 21 and negative electrode sheet 22.

[0065] <First Laser Tab Cutting Processing Device 150, Second Laser Tab Cutting Processing Device 160>

[0066] The first laser tab cutting device 150 is a device for forming tabs 21d at predetermined intervals on the positive electrode sheet 21. The first laser tab cutting device 150 forms tabs 21d in unformed areas 21a3 of the positive electrode sheet 21 conveyed by the first conveying device 120. The second laser tab cutting device 160 is a device for forming tabs 22d at predetermined intervals on the negative electrode sheet 22. The second laser tab cutting device 160 forms tabs 22d in unformed areas 22a3 of the negative electrode sheet 22 conveyed by the second conveying device 130. In this embodiment, the positive electrode sheet 21 and the negative electrode sheet 22 are formed with first edges 21a1 and 22a1 that are the same in the width direction. However, it is not limited to this form, and tabs can also be formed on the first edge of one of the positive electrode sheet 21 and the negative electrode sheet 22, and tabs can be formed on the second edge of the other.

[0067] The following describes the formation of the tab by taking the first laser tab cutting apparatus 150 for forming the tab 21d on the positive electrode sheet 21 as an example. The second laser tab cutting apparatus 160 can be considered to be the same as the first laser tab cutting apparatus 150, and thus detailed description thereof is omitted.

[0068] The first laser tab cutting processing device 150 can include, for example, a chamber, a laser oscillator, and a scanner. The chamber surrounds a space in which the tab 21d is formed on the positive electrode sheet 21. The positive electrode sheet 21 is irradiated with laser while being transported in the chamber, so that the tab 21d can be formed. The laser oscillator is a device that irradiates laser. The wavelength, frequency, output, etc. of the laser are appropriately set. The laser oscillator can also be installed on a scanner that controls the irradiation angle, position, etc. of the laser. By controlling the irradiation of the laser by the scanner, the trajectory of the laser irradiated to the positive electrode sheet 21 can be determined.

[0069] Figure 5 Schematic diagram of the positive electrode sheet 21 with the tab 21d formed. Figure 5 In FIG. 1 , the dotted line shows the trajectory L of the laser irradiated to the positive electrode sheet 21. Figure 5 As shown, the positive electrode sheet 21 being transported has an unformed region 21a3 formed at the first edge 21a1 in the width direction. The second edge 21a2 in the width direction does not have the unformed region 21a3, but is covered by the positive electrode active material layer 21b. The laser is irradiated to the first edge 21a1 side where the unformed region 21a3 is formed. The end of the positive electrode sheet 21 on the first edge 21a1 side is cut off according to the trajectory L of the laser.

[0070] In the region where the tabs 21d are formed, the track L is set to follow the shape and size of the tabs 21d. Between the regions where the tabs 21d are formed, the track L is set to advance along the length direction of the positive electrode sheet 21 toward the upstream side of the positive electrode sheet 21 by a length corresponding to the spacing between the tabs 21d (the spacing G between adjacent tabs 21d). Thus, tabs 21d of a predetermined shape are formed at a predetermined spacing on the positive electrode sheet 21.

[0071] In this embodiment, between the regions where the tabs 21d are formed, the track L is set to pass through the positive electrode active material layer 21b along the length direction. Thus, a tab 21d that is covered by the positive electrode active material layer 21b to a portion of the base end is formed on the positive electrode sheet 21. In addition, in order to reduce the waste of positive electrode active material, the track L can be set near the unformed region 21a3. Not limited to this form, the track L can also be set to pass only through the unformed region 21a3. Thus, the waste of positive electrode active material can be reduced. The fragments cut off from the positive electrode sheet 21 by the laser can be recovered by a waste separation device not shown.

[0072] The spacing, size, etc. of the tabs 21d are determined according to the target wound electrode body 20 (see Figure 2 ) structure and is appropriately set. The pitch of the tabs 21d formed and the interval G of the tabs 21d are not constant, so that when the winding body 20a (refer to Figure 4 ) when the tabs 21d of the positive electrode sheet 21 are wound so as to overlap in the radial direction.

[0073] like Figure 3 As shown, the positive electrode sheet 21 formed with the tab 21d by the first laser tab cutting processing device 150 and the negative electrode sheet 22 formed with the tab 22d by the second laser tab cutting processing device 160 are wound on the reel 110 by the winding device 170. If the number of windings of the positive electrode sheet 21, the negative electrode sheet 22 and the separators 31 and 32 relative to the reel 110 reaches a predetermined number, the winding device 170 is stopped. The positive electrode sheet 21, the negative electrode sheet 22 and the separators 31 and 32 wound on the reel 110 are cut by a cutter not shown in the figure, and the separators 31 and 32 on the outer peripheral surface are fixed with tape to form a winding body 20a. The winding body 20a is taken out from the reel by a taking-out device not shown in the figure. The taken-out winding body 20a is roughly cylindrical. The winding body 20a is conveyed to the punching device 200.

[0074] <Pressing device 200>

[0075] The punching device 200 is a device for pre-punching the winding body 20a. As the punching device 200, a known punching machine or the like can be used. The winding body 20a is punched along a predetermined direction by the punching device 200. In the winding body 20a, the pole lugs 21d and the pole lugs 22d respectively arranged at two locations in the circumferential direction are punched in such a manner that they overlap after punching. Thus, a flat winding body 20a is produced.

[0076] The pre-punched wound body 20a is punched with a punching pressure stronger than the pre-punching pressure to produce a flat wound electrode body 20. The produced wound electrode body 20 is placed in a casing, sealed, and injected with an electrolyte to prepare an assembly. The assembly is subjected to an initial charging treatment and an aging treatment by a known method to produce the power storage device 1 (see Figure 1 ).

[0077] <Control device 180>

[0078] The control device 180 controls the processing conditions of the first laser tab cutting processing device 150 and the second laser tab cutting processing device 160. The control device 180 includes a storage unit 181, a first acquisition unit 182, a first calculation unit 183, a first adjustment unit 184, a second acquisition unit 185, a second calculation unit 186, a second adjustment unit 187, a third acquisition unit 188, a third calculation unit 189, and a third adjustment unit 190. The control device 180 can be, for example, a computer such as an ECU (Electronic Control Unit) or a microcomputer-mounted circuit board. The computer performs the required functions according to a predetermined program. The various functions of the computer are processed by the cooperation of the computer's computing device (also called a processor, CPU (Central Processing Unit: central processing unit), MPU (Micro-Processing Unit: microprocessor)), a storage device (memory and hard disk, etc.), and software.

[0079] In the electrical storage device manufacturing apparatus 100, the processing conditions of the first laser tab cutting processing device 150 and the second laser tab cutting processing device 160 are stored in the storage unit 181 of the control device 180. The trajectory L of the laser can be controlled according to the stored processing conditions. In the electrical storage device manufacturing apparatus 100, the processing conditions stored in the control device 180 are adjusted based on various parameters measured during and after the winding of the winding body 20a.

[0080] <Example 1>

[0081] Figure 6 is a block diagram showing the processing performed by the control device 180. Figure 6 As shown, the first tab detection device 201, the second tab detection device 202, and the rotation angle measurement device 203 are provided in the manufacturing device 100 of the storage device. The first tab detection device 201 is provided in the conveying path between the first laser tab cutting device 150 and the reel 110. The second tab detection device 202 is provided in the conveying path between the second laser tab cutting device 160 and the reel 110. The rotation angle measurement device 203 is connected to the reel 110.

[0082] The rotation angle measuring device 203 is a device for measuring the rotation angle of the reel 110 driven and rotated by the winding device 170. The rotation angle measuring device 203 can also detect the rotation speed of the reel 110. The rotation angle measuring device 203 is not particularly limited as long as it can measure the rotation angle of the reel 110. As the rotation angle measuring device 203, for example, a rotary encoder can be used. The rotation angle of the reel 110 measured by the rotation angle measuring device 203 is sent to the control device 180.

[0083] The first tab detection device 201 is a device for detecting the passage of the tab 21d of the positive electrode sheet 21 being conveyed. The second tab detection device 202 is a device for detecting the passage of the tab 22d of the negative electrode sheet 22 being conveyed. The first tab detection device 201 is described below. The second tab detection device 202 can be regarded as the same as the first tab detection device, so the detailed description is omitted.

[0084] The first tab detection device 201 is not particularly limited as long as it can detect the passage of the tab 21d of the positive electrode sheet 21 being conveyed. As the first tab detection device 201, for example, a reflective, regressive reflective, or transmissive laser sensor can be used. In this embodiment, a regressive reflective laser sensor is used as the first tab detection device 201.

[0085] Figure 7 Schematic diagram showing the first tab detection device 201. Figure 7 As shown, the first tab detection device 201 irradiates the position where the tab 21d passes with a laser. In the first tab detection device 201, an optical path is set so that the laser is irradiated to a predetermined position where the tab 21d passes. Figure 7 In the figure, the optical path is set in the paper depth direction. When the tab 21d passes through the irradiation position, the laser is reflected by the tab 21d. The first tab detection device 201 detects the passage of the tab 21d by detecting the reflected light. If the first tab detection device 201 detects the passage of the tab 21d, it sends a signal to the control device 180 (refer to Figure 6 ) The detection of the tab 21d is sent to the control device 180. The tabs 21d are formed at a predetermined pitch on the positive electrode sheet 21. Therefore, each time the passage of the tab 21d is detected, the detection of the tab 21d is sent to the control device 180.

[0086] like Figure 6 As shown, the control device 180 is configured to perform the first processing S11, in which the tab spacing of the positive electrode sheet 21 wound on the reel 110 relative to the rotation angle of the reel 110 is obtained. Here, the tab spacing refers to the interval between the tabs 21d adjacent to each other along the conveying direction. Here, the first acquisition unit 182 of the control device 180 obtains the information of the passage of the tab 21d from the first tab detection device 201. In addition, the first acquisition unit 182 of the control device 180 obtains the rotation angle of the reel 110 when the tab 21d passes from the rotation angle measurement device 203. Here, the first acquisition unit 182 of the control device 180 obtains the rotation angle of the reel 110 when the tab 21d passes.

[0087] The control device 180 is configured to execute the second process S12 similarly to the first process S11 , and in the second process S12 , the tab pitch of the negative electrode sheet 22 wound around the winding shaft 110 with respect to the rotation angle of the winding shaft 110 is obtained.

[0088] In the control device 180, the transport conditions of the positive electrode sheet 21 and the processing conditions of the tab 21d are programmed so that the tab 21d of the positive electrode sheet 21 overlaps at a predetermined angle with respect to the reference line of the reel 110. In the control device 180, the transport conditions of the negative electrode sheet 22 and the processing conditions of the tab 22d are programmed so that the tab 22d of the negative electrode sheet 22 overlaps at a predetermined angle with respect to the reference line of the reel 110.

[0089] The control device 180 is configured to perform a third process S13, in which the interval of the tabs 21d is adjusted based on the tab spacing of the positive electrode sheet 21 wound on the reel 110 relative to the rotation angle of the reel 110 obtained in the first process S11. Similarly, the control device 180 is configured to perform a fourth process S14, in which the interval of the tabs 22d is adjusted based on the tab spacing of the negative electrode sheet 22 wound on the reel 110 relative to the rotation angle of the reel 110 obtained in the second process S12. In the winding body 20a being wound, the position of the tab 21d moves according to the rotation angle of the reel 110. In addition, the tab spacing changes according to the number of windings. The first calculation unit 183 of the control device 180 calculates the difference between the rotation angle of the reel 110 when the pole tab 21d passes through, which is obtained during winding, and the set value of the rotation angle of the reel 110 when the pole tab 21d passes through, based on the programmed processing conditions and conveying conditions. When there is a difference between the rotation angle of the reel 110 when the pole tab 21d passes through, which is obtained during winding, and the set value, the first adjustment unit 184 adjusts the processing conditions of the pole tabs 21d and 22d stored in the storage unit 181. For example, when the pole tab spacing obtained at a certain rotation angle is greater than the set value, the first adjustment unit 184 can adjust in a manner that the pole tab spacing between the pole tabs determined according to the rotation angle becomes smaller. When the pole tab spacing obtained at a certain rotation angle is less than the set value, the first adjustment unit 184 adjusts in a manner that the pole tab spacing between the pole tabs determined according to the rotation angle becomes larger.

[0090] The control device 180 is configured to execute the above-mentioned first process S11 to fourth process S14. In this way, the control device 180 feeds back the rotation angle of the winding shaft 110 and the obtained tab spacing to adjust the processing conditions of the tabs. As a result, the spacing between the tabs is easy to approach the set value, and the positions of the tabs 21d and 22d are easy to align when the winding body 20a is wound. As a result, when manufacturing the wound electrode body 20, the position accuracy of the tabs 21d and 22d is improved.

[0091] By improving the positional accuracy of the tabs 21d and 22d, the tabs 21d and 22d can be easily aligned in the stacking direction even when assembling the storage device 1. As a result, the positional accuracy of the tabs 21d and 22d over the width of the tabs 21d and 22d can be improved. As a result, the degree of freedom in the design of components mounted on the cover 12 can be increased. For example, the size of the internal terminals 53 and 63 can be reduced, and the manufacturing cost can be reduced. In the case of a wound electrode body 20 (see FIG. 1 ) in which the tabs 21d and 22d protrude from the same direction Figure 2 ) in the power storage device 1, this effect is greater.

[0092] <Example 2>

[0093] Figure 8 FIG. 1 is a block diagram showing a process performed by the control device 180 according to another embodiment. Figure 8 As shown, image inspection devices 204 to 206 are provided in the manufacturing device 100 of the storage battery device. The image inspection devices 204 to 206 are devices for inspecting the positions of the tabs 21d and 22d of the wound electrode body 20 punched by the punching device 200. The image inspection devices 204 to 206 are not particularly limited as long as they can inspect the positions of the tabs 21d and 22d. For example, an image sensor of a size that can obtain a top view image can be used as the image inspection devices 204 to 206.

[0094] The image inspection device 204 is a device for inspecting the tab 21d of the positive electrode, and the image inspection device 205 is a device for inspecting the tab 22d of the negative electrode. Fig. 9 204 and 205 are schematic diagrams showing image inspection devices 204 and 205. Fig. 9 , the positional relationship between the image inspection devices 204 and 205 and the tabs 21d and 22d as viewed in the direction in which the tabs 21d and 22d are stacked is shown. Fig. 9 In the figure, the punching device 200 is omitted.

[0095] like Fig. 9 As shown, the image inspection devices 204 and 205 detect the positions of the tabs 21d and 22d of the winding body 20a in the state of being pre-punched by the punching device 200. The image inspection devices 204 and 205 respectively obtain the shape data of the tabs 21d and 22d in the surface where the tabs 21d and 22d protrude. The shooting surfaces of the image inspection devices 204 and 205 are oblique with respect to the surface where the tabs 21d and 22d protrude. In the winding body 20a, predetermined reference positions P1 and P2 of the outer ends of the tabs 21d and 22d are set based on the processing conditions of the tabs. The image data obtained by the image inspection devices 204 and 205 are sent to the control device 180.

[0096] Fig.102 is a schematic diagram showing the image inspection device 206. Fig.10 , the positional relationship between the image inspection device 206 and the tabs 21d and 22d as viewed in the direction in which the tabs 21d and 22d are stacked is shown. Fig.10 In the example, the shooting direction of the image inspection device 206 is set to the depth direction of the paper. Fig.10 As shown, the pre-punched winding body 20a is held by the transport chuck 200a and transported along the width direction of the tabs 21d and 22d. The image inspection device 206 detects the position of the tabs 21d and 22d based on the stacking direction of the tabs 21d and 22d extending from the winding body 20a (the punching direction of the pre-punching). In this embodiment, the image inspection device 206 obtains the position data of the tabs 21d and 22d of the conveyed winding body 20a from above. The image data obtained by the image inspection device 206 is sent to the control device 180.

[0097] like Figure 8 As shown, the control device 180 is configured to execute the first process S21, in which the position of the tab 21d of the positive electrode sheet 21 of the winding body 20a punched by the punching device 200 is obtained. The control device 180 is configured to execute the second process S22 similar to the first process S21, in which the position of the tab 22d of the negative electrode sheet 22 of the winding body 20a punched by the punching device 200 is obtained. Here, the second acquisition unit 185 of the control device 180 acquires the position data of the tabs 21d and 22d from the image inspection devices 204 to 206.

[0098] The control device 180 is configured to perform a third process S23, in which the interval between the tabs 21d is adjusted based on the position of the tabs 21d of the positive electrode sheet 21 of the winding body 20a after being punched by the punching device 200 obtained in the first process S21. Similarly, the control device 180 is configured to perform a fourth process S24, in which the interval between the tabs 22d is adjusted based on the position of the tabs 22d of the negative electrode sheet 22 of the winding body 20a after being punched by the punching device 200 obtained in the second process S22. In this embodiment, the second calculation unit 186 of the control device 180 calculates the amount (length) of deviation of the tabs 21d and 22d from the reference positions P1 and P2 in the width direction.

[0099] Fig.11 Schematic diagram showing the wound body 20a after pre-punching. Fig.11 , the positions of the tabs 21d and 22d are shown along the protruding direction of the tabs 21d and 22d. Fig.11As shown, there is a case where the deviation of the tabs 21d and 22d of the winding body 20a from the reference positions P1 and P2 is confirmed based on the image data obtained by the image inspection devices 204 and 205. The second calculation unit 186 may also calculate the amount of deviation of the tabs 21d and 22d from the reference positions P1 and P2, respectively. Fig.11 As shown in FIG. 1 , when the deviations from the reference positions P1 and P2 are different in the tabs 21d and 22d, respectively, the second calculation unit 186 may calculate the deviations of the tabs 21d and 22d based on the approximate curve. For example, the second calculation unit 186 performs a process of connecting the ends (for example, the outer ends) of the tabs 21d and 22d to obtain the approximate curve. The second calculation unit 186 may also calculate the deviations of the tabs 21d and 22d based on the approximate curve and the reference positions P1 and P2.

[0100] In addition, the deviation of the tabs 21d and 22d along the stacking direction of the tabs 21d and 22d can be calculated based on the image data obtained by the image inspection device 206 (see Fig.10 ). At this time, the deviation of the tabs 21d and 22d that can be observed from above can be detected. Based on the image data obtained by the image inspection device 206, the maximum value of the deviation in the stacked tabs 21d and 22d can be calculated.

[0101] When the calculated positions of the tabs 21d and 22d deviate from the reference positions P1 and P2, the second adjustment unit 187 adjusts the processing conditions of the tabs 21d and 22d stored in the storage unit 181. For example, when the calculated positions of the tabs 21d and 22d deviate from the direction in which the winding body 20a is wound in a direction that advances relative to the reference positions P1 and P2, the adjustment can be performed so that the tab spacing becomes smaller. When the calculated positions of the tabs 21d and 22d deviate from the direction in which the winding body 20a is wound in a direction that retreats relative to the reference positions P1 and P2, the adjustment can be performed so that the tab spacing becomes larger.

[0102] The control device 180 is configured to execute the first process S21 to the fourth process S24. Thus, in the control device 180, the positions of the tabs 21d and 22d of the wound body 20a after punching are fed back, and the processing conditions of the tabs are adjusted. For example, after the sheet body is wound on the reel 110 to form the wound body 20a, it is easy to feed back the deviation of the position of the tabs 21d and 22d that can be generated by punching the wound body 20a. Therefore, the processing conditions of the tabs can be adjusted according to the position deviation of the tabs 21d and 22d during punching. As a result, the position accuracy of the tabs 21d and 22d in the wound electrode body 20 after punching is easily improved.

[0103] <Example 3>

[0104] Fig.12 FIG. 1 is a block diagram showing a process performed by the control device 180 according to another embodiment. Fig.12 As shown, the manufacturing device 100 of the storage device is provided with thickness inspection devices 207 to 210. The thickness inspection devices 207 to 210 are devices for measuring the thickness of the positive electrode sheet 21, the negative electrode sheet 22, and the separators 31 and 32 respectively. The thickness inspection devices 207 to 210 are not particularly limited as long as they can inspect the thickness of each sheet. For example, a non-contact laser displacement meter can be used as the thickness inspection devices 207 to 210.

[0105] Fig.13 2 is a schematic diagram showing the thickness inspection device 207. Fig.13 , the thickness inspection device 207 and the positive electrode sheet 21 are shown along the direction of conveying the positive electrode sheet 21. Fig.13 As shown, the thickness inspection device 207 is configured to be able to irradiate the positive electrode sheet 21 with laser light approximately vertically. The thickness inspection device 207 irradiates the laser light to the unformed area 21a3 of the positive electrode collector foil 21a and the surface of the positive electrode active material layer 21b formed on the positive electrode collector foil 21a. The thickness inspection device 207 detects the reflected light reflected from the unformed area 21a3 and the surface of the positive electrode active material layer 21b, and measures the thickness of the positive electrode active material layer 21b. The thickness inspection device 207 can continuously measure the thickness of the positive electrode active material layer 21b. In this embodiment, the thickness inspection device 207 is set at a position where the thickness of the positive electrode sheet 21 can be measured at a position along a guide roller not shown in the figure. By measuring the thickness of the positive electrode sheet 21 in a state along the guide roller, the deviation in the thickness direction is suppressed, and the measurement accuracy of the thickness of the positive electrode sheet 21 can be improved.

[0106] The thickness inspection device 208 (see Fig.12 ), which can be regarded as the same as the thickness inspection device 207, and thus detailed description is omitted. Fig.12 ) measures the thickness of the separators 31 and 32. The measured thicknesses of the positive electrode active material layer 21b and the negative electrode active material layer 22b are sent to the control device 180.

[0107] like Fig.12As shown, the control device 180 is configured to execute the first process S31, in which the thickness of the positive electrode sheet 21 wound on the reel 110 is obtained. The control device 180 is configured to execute the second process S32 similar to the first process S31, in which the thickness of the negative electrode sheet 22 wound on the reel 110 is obtained. Here, the third acquisition unit 188 of the control device 180 acquires the data of the thickness of the positive electrode sheet 21, the negative electrode sheet 22, and the separators 31 and 32 from the thickness inspection devices 207 to 210.

[0108] The control device 180 is configured to execute the third process S33, in which the interval between the tabs 21d is adjusted based on the thickness of the positive electrode sheet 21 wound on the reel 110 obtained in the first process S31. Similarly, the control device 180 is configured to execute the fourth process S34, in which the interval between the tabs 22d is adjusted based on the thickness of the negative electrode sheet 22 wound on the reel 110 obtained in the second process S32. In this embodiment, the third calculation unit 189 of the control device 180 calculates the difference between the obtained thickness of each sheet and the reference thickness.

[0109] Here, the reference thickness refers to the set value of the thickness of each sheet when the winding body 20a is made. For the prepared sheet, thickness deviation sometimes occurs in the plane. For example, the positive active material layer 21b and the negative active material layer 22b can be formed by applying to the substrate (positive collector foil 21a and negative collector foil 22a) in a paste state and drying. Therefore, thickness deviation may occur in the positive electrode sheet 21 and the negative electrode sheet 22. In addition, the thickness of the positive collector foil 21a, the negative collector foil 22a and the separators 31 and 32 is not necessarily constant. When there is a thickness deviation in the length direction of the sheet, the length of the winding relative to the reel 110 may change. For example, when the thickness of the sheet is thinner than the reference thickness, the outer diameter of the winding body 20a wound on the reel 110 becomes smaller. As a result, the positions of the tabs 21d and 22d may deviate from the forward position compared to the above-mentioned specified position. When the thickness of the sheet is thicker than the reference thickness, the outer diameter of the wound body 20a wound on the winding shaft 110 increases. As a result, the positions of the tabs 21d and 22d may deviate from the predetermined positions to positions retreated.

[0110] The third calculation unit 189 of the control device 180 can calculate the deviation of the tabs 21d and 22d based on the difference between the obtained thickness of each sheet and the reference thickness. The third adjustment unit 190 adjusts the processing conditions of the tabs 21d and 22d stored in the storage unit 181. For example, when the calculated thickness of the sheet is thicker than the reference thickness, the adjustment can be made in a manner that the tab spacing becomes larger. When the calculated thickness of the sheet is thinner than the reference thickness, the adjustment can be made in a manner that the tab spacing becomes smaller.

[0111] The control device 180 is configured to perform the first processing S31 to the fourth processing S34. Thus, in the control device 180, information on the thickness of the sheet before winding is fed back to adjust the processing conditions of the tabs. For example, for each manufacturing batch, when a difference is observed in the trend of the thickness of the sheet and the reference thickness, the processing conditions when winding the sheets of the same manufacturing batch can also be adjusted. Thus, the position accuracy of the wound body 20a after winding can be improved. In addition, the spacing between the tabs 21d and 22d in the sheet being wound can also be adjusted according to the thickness of the sheet. Thus, the deviation of the position of the tabs 21d and 22d caused by the thickness deviation of the sheet can be reduced. As a result, even in the wound body 20a being wound, the position accuracy of the tabs 21d and 22d after winding can be improved.

[0112] <Example 4>

[0113] Fig.14 FIG. 1 is a block diagram showing a process performed by the control device 180 according to another embodiment. Fig.14 As shown, in the manufacturing device 100 of the storage device, the first tab detection device 201, the second tab detection device 202 and the rotation angle measurement device 203 are provided in the same manner as in the first embodiment. In the manufacturing device 100 of the storage device, image inspection devices 204 to 206 are also provided in the same manner as in the second embodiment. The control device 180 is configured to execute the first processing S41 to the eighth processing S48. Here, the first processing S41 to the fourth processing S44 are the same as the first processing S11 to the fourth processing S14 of the first embodiment, and the fifth processing S45 to the eighth processing S48 are the same as the first processing S21 to the fourth processing S24 of the second embodiment.

[0114] In the manufacturing device 100 of the storage device, the rotation angle of the reel 110 and the obtained tab spacing are fed back through the first process S41 to the fourth process S44 executed by the control device 180 to adjust the processing conditions of the tabs. In addition, the positions of the tabs 21d and 22d of the wound body 20a after punching are fed back through the fifth process S45 to the eighth process S48 to adjust the processing conditions of the tabs. As a result, in addition to the tab spacing being easy to approach the set value, the position accuracy of the tabs 21d and 22d in the wound electrode body 20 after winding and punching is also easy to improve. As a result, the position accuracy of the tabs 21d and 22d can be further improved.

[0115] <Example 5>

[0116] Fig.15 FIG. 1 is a block diagram showing a process performed by the control device 180 according to another embodiment. Fig.15As shown, in the manufacturing device 100 of the storage device, the first tab detection device 201, the second tab detection device 202 and the rotation angle measurement device 203 are provided in the same manner as in the first embodiment. In the manufacturing device 100 of the storage device, thickness inspection devices 207 to 210 are also provided in the same manner as in the third embodiment. The control device 180 is configured to execute the first processing S51 to the eighth processing S58. Here, the first processing S51 to the fourth processing S54 are the same as the first processing S11 to the fourth processing S14 of the first embodiment, and the fifth processing S55 to the eighth processing S58 are the same as the first processing S31 to the fourth processing S34 of the third embodiment.

[0117] In the manufacturing device 100 of the storage device, the rotation angle of the reel 110 and the obtained tab spacing are fed back through the first processing S51 to the fourth processing S54 executed by the control device 180, and the processing conditions of the tabs are adjusted. In addition, the information of the thickness of the sheet before winding is fed back through the fifth processing S55 to the eighth processing S58 to adjust the processing conditions of the tabs. In this way, in addition to the tab spacing being close to the set value, the deviation of the position of the tabs 21d and 22d caused by the thickness deviation of the sheet can also be reduced. As a result, the position accuracy of the tabs 21d and 22d can be further improved.

[0118] <Example 6>

[0119] Fig.16 FIG. 1 is a block diagram showing a process performed by the control device 180 according to another embodiment. Fig.16 As shown, the manufacturing apparatus 100 of the storage device is provided with image inspection apparatuses 204 to 206 as in the second embodiment. The manufacturing apparatus 100 of the storage device is also provided with thickness inspection apparatuses 207 to 210 as in the third embodiment. The control apparatus 180 is configured to execute the first processing S61 to the eighth processing S68. Here, the first processing S61 to the fourth processing S64 are the same as the first processing S21 to the fourth processing S24 of the second embodiment, and the fifth processing S65 to the eighth processing S68 are the same as the first processing S31 to the fourth processing S34 of the third embodiment.

[0120] In the manufacturing device 100 of the storage device, the positions of the tabs 21d and 22d of the wound body 20a after punching are fed back through the first process S61 to the fourth process S64 executed by the control device 180, and the processing conditions of the tabs are adjusted. In addition, the information of the thickness of the sheet before winding is fed back through the fifth process S65 to the eighth process S68, and the processing conditions of the tabs are adjusted. In this way, in addition to reducing the deviation of the position of the tabs 21d and 22d caused by the thickness deviation of the sheet, the position accuracy of the tabs 21d and 22d in the wound electrode body 20 after winding and punching is also easily improved. As a result, the position accuracy of the tabs 21d and 22d can be further improved.

[0121] <Example 7>

[0122] Fig.17 FIG. 1 is a block diagram showing a process performed by the control device 180 according to another embodiment. Fig.17 As shown, in the manufacturing apparatus 100 of the storage device, the first tab detection device 201, the second tab detection device 202, and the rotation angle measurement device 203 are provided in the same manner as in the first embodiment. In the manufacturing apparatus 100 of the storage device, image inspection devices 204 to 206 are further provided in the same manner as in the second embodiment. In the manufacturing apparatus 100 of the storage device, thickness inspection devices 207 to 210 are further provided in the same manner as in the third embodiment. The control device 180 is configured to execute the first processing S71 to the twelfth processing S82. Here, the first processing S71 to the fourth processing S74 are the same as the first processing S11 to the fourth processing S14 of the first embodiment, the fifth processing S75 to the eighth processing S78 are the same as the first processing S21 to the fourth processing S24 of the second embodiment, and the ninth processing S79 to the twelfth processing S82 are the same as the first processing S31 to the fourth processing S34 of the third embodiment.

[0123] In the manufacturing device 100 of the storage device, the rotation angle of the reel 110 and the obtained tab spacing are fed back through the first processing S71 to the fourth processing S74 executed by the control device 180 to adjust the processing conditions of the tabs. In addition, the positions of the tabs 21d and 22d of the wound body 20a after punching are fed back through the fifth processing S75 to the eighth processing S78 to adjust the processing conditions of the tabs. And, through the ninth processing S79 to the twelfth processing S82, the information of the thickness of the sheet before winding is fed back to adjust the processing conditions of the tabs. As a result, in addition to the tab spacing being close to the set value, the deviation of the position of the tabs 21d and 22d caused by the thickness deviation of the sheet can be reduced. In addition, the position accuracy of the tabs 21d and 22d in the wound electrode body 20 after winding and punching is easily improved. As a result, the position accuracy of the tabs 21d and 22d can be further improved.

[0124] In this embodiment, the processing conditions of the tabs are adjusted based on the tab spacing (variable 1) of the sheets 21 and 22 before winding obtained in the first and second processes S71 and S72, the positions of the tabs 21d and 22d after punching obtained in the fifth and sixth processes S75 and S76 (variables 2 and 3), and the thicknesses of the sheets 21, 22, 31 and 32 obtained in the ninth and tenth processes S79 and S80 (variable 4). The tab spacing of the sheets 21 and 22 before winding, the positions of the tabs 21d and 22d after punching, and the thicknesses of the sheets 21, 22, 31 and 32 may be weighted and reflected in the processing conditions of the tabs. Here, the positions of the tabs 21d and 22d calculated by the image inspection devices 204 and 205 are set as variable 2, and the positions of the tabs 21d and 22d calculated by the image inspection device 206 are set as variable 3.

[0125] For example, weighting coefficients W1 to W4 may be allocated to variables 1 to 4. Each coefficient may be set so that the sum of weighting coefficients W1 to W4 becomes 1. The correction value of the tab pitch for adjusting the processing conditions of the tabs can be expressed based on the following formula.

[0126] Correction value of tab spacing = W1×variable 1+W2×variable 2+W3×variable 3+W4×variable 4

[0127] The weighting coefficients W1 to W4 can be appropriately set according to product specifications, processing conditions, etc. Therefore, the weighting coefficients W1 to W4 may be determined based on data accumulated during production, testing, and the like.

[0128] In addition, from the viewpoint of stabilizing the position of the tabs, the tabs can be processed continuously at a constant speed for the sheet being transported. For example, a sheet without tabs can be transported from a winding roll to a winding roll, and tabs can be formed on the sheet on the transport path. Thus, a roller for winding a sheet with tabs formed can be prepared. According to the experiment of the inventor, when the tab processing is performed during the winding of the winding body, or when the tab processing is stopped each time the winding body is made, there is a situation where the position of the tabs deviates. However, according to the manufacturing device 100 of the storage battery device disclosed herein, each time the winding body 20a is made, the position of the tabs 21d, 22d can be fed back to the processing conditions of the tabs. The processing conditions of the tabs 21d, 22d are adjusted according to the winding conditions when the winding body 20a is wound. Thus, even in the case where the conveyance of the sheet and the tab processing become intermittent actions, it is easy to improve the position accuracy of the tabs 21d, 22d.

[0129] The above is a description of the technology disclosed herein. Unless otherwise specified, the embodiments and the like cited here do not limit the present invention. The order of the first to twelfth processes performed by the above-mentioned control device is not particularly limited, and can also be appropriately changed according to the process of manufacturing the power storage device, etc. In addition, the technology disclosed herein can be variously changed, and the various components and the various processes mentioned here can be appropriately omitted or appropriately combined as long as no special problems arise.

Claims

1. A manufacturing device for an electric storage device, wherein: The manufacturing apparatus of the electric storage device comprises: reel; a first conveying device for conveying the strip-shaped positive electrode sheet toward the reel; a first laser tab cutting device for forming tabs at predetermined intervals on the positive electrode sheet transported by the first transport device; a second conveying device for conveying the strip-shaped negative electrode sheet toward the reel; a second laser tab cutting device for forming tabs at predetermined intervals on the negative electrode sheet transported by the second transport device; a winding device that rotates the winding shaft to wind up the positive electrode sheet having the tab formed thereon by the first laser tab cutting device and the negative electrode sheet having the tab formed thereon by the second laser tab cutting device; and Control device, The positive electrode sheet includes a strip-shaped positive electrode collector foil and a positive electrode active material layer, wherein the positive electrode active material layer is formed in a region of the strip-shaped positive electrode collector foil except for a non-formed region of a first edge portion set in a width direction. The negative electrode sheet includes a strip-shaped negative electrode collector foil and a negative electrode active material layer, wherein the negative electrode active material layer is formed in a region of the strip-shaped negative electrode collector foil except for a first edge portion set in a width direction where the negative electrode active material layer is not formed. The control device is configured to perform: A first process is to obtain a tab spacing of the positive electrode sheet wound on the winding shaft relative to a rotation angle of the winding shaft; A second process of obtaining a tab spacing of the negative electrode sheet wound on the winding shaft relative to a rotation angle of the winding shaft; A third process, based on the tab spacing of the positive electrode sheet wound on the reel relative to the rotation angle of the reel obtained in the first process, the first laser tab cutting process device adjusts the spacing of the tabs formed on the positive electrode sheet; as well as In a fourth process, the second laser tab cutting device adjusts the interval between the tabs formed on the negative electrode sheet based on the tab pitch of the negative electrode sheet wound around the reel relative to the rotation angle of the reel obtained in the second process.

2. The manufacturing apparatus for an electrical storage device according to claim 1, wherein: A punching device is also provided for punching the wound body taken out from the winding shaft. The control device is configured to further execute: a fifth process of obtaining the position of the tab of the positive electrode sheet of the wound body after being punched by the punching device; a sixth process of obtaining the position of the tab of the negative electrode sheet of the wound body after being punched by the punching device; A seventh process, based on the position of the tabs of the positive electrode sheet of the wound body after being punched by the punching device obtained in the fifth process, the first laser tab cutting device adjusts the interval between the tabs formed on the positive electrode sheet; as well as In an eighth process, the second laser tab cutting device adjusts the interval between the tabs formed on the negative electrode sheet based on the positions of the tabs of the negative electrode sheet of the wound body after being punched by the punching device, which are obtained in the sixth process.

3. The manufacturing apparatus for an electrical storage device according to claim 1 or 2, wherein: The control device is configured to further execute: a ninth process of obtaining the thickness of the positive electrode sheet wound on the reel; a tenth process of obtaining the thickness of the negative electrode sheet wound on the winding shaft; In an eleventh process, the first laser tab cutting device adjusts the interval of the tabs formed in the unformed area of ​​the positive electrode sheet based on the thickness of the positive electrode sheet wound on the reel relative to the rotation angle of the reel obtained in the ninth process; as well as In the twelfth process, the second laser tab cutting device adjusts the interval between the tabs formed in the unformed area of ​​the negative electrode sheet based on the thickness of the negative electrode sheet wound around the reel relative to the rotation angle of the reel obtained in the tenth process.

4. A manufacturing apparatus for an electrical storage device, wherein: The manufacturing apparatus of the electric storage device comprises: reel; a first conveying device for conveying the strip-shaped positive electrode sheet toward the reel; a first laser tab cutting device for forming tabs at predetermined intervals on the positive electrode sheet transported by the first transport device; a second conveying device for conveying the strip-shaped negative electrode sheet toward the reel; a second laser tab cutting device for forming tabs at predetermined intervals on the negative electrode sheet transported by the second transport device; A winding device rotates the winding shaft to wind up the positive electrode sheet having the tab formed by the first laser tab cutting device and the negative electrode sheet having the tab formed by the second laser tab cutting device; a punching device for punching the wound body taken out from the reel; and Control device, The positive electrode sheet includes a strip-shaped positive electrode collector foil and a positive electrode active material layer, wherein the positive electrode active material layer is formed in a region of the strip-shaped positive electrode collector foil except for a non-formed region of a first edge portion set in a width direction. The negative electrode sheet includes a strip-shaped negative electrode collector foil and a negative electrode active material layer, wherein the negative electrode active material layer is formed in a region of the strip-shaped negative electrode collector foil except for a first edge portion set in a width direction where the negative electrode active material layer is not formed. The control device is configured to perform: A first process is to obtain the position of the tab of the positive electrode sheet of the wound body after being punched by the punching device; a second process of obtaining the position of the tab of the negative electrode sheet of the wound body after being punched by the punching device; A third process, based on the position of the tabs of the positive electrode sheet of the wound body after being punched by the punching device obtained in the first process, the first laser tab cutting process device adjusts the intervals of the tabs formed on the positive electrode sheet; as well as In a fourth process, the second laser tab cutting device adjusts the interval between the tabs formed on the negative electrode sheet based on the positions of the tabs of the negative electrode sheet of the wound body after being punched by the punching device, which are obtained in the second process.

5. The manufacturing apparatus of the electrical storage device according to claim 4, wherein: The control device is configured to further execute: a fifth process of obtaining the thickness of the positive electrode sheet wound on the reel; a sixth process of obtaining the thickness of the negative electrode sheet wound on the winding shaft; A seventh process, wherein the first laser tab cutting device adjusts the interval of the tabs formed in the unformed area of ​​the positive electrode sheet based on the thickness of the positive electrode sheet wound on the reel relative to the rotation angle of the reel obtained in the fifth process; as well as In the eighth process, the second laser tab cutting device adjusts the interval between the tabs formed in the unformed area of ​​the negative electrode sheet based on the thickness of the negative electrode sheet wound around the reel relative to the rotation angle of the reel obtained in the sixth process.

6. A manufacturing apparatus for an electrical storage device, wherein: The manufacturing apparatus of the electric storage device comprises: reel; a first conveying device for conveying the strip-shaped positive electrode sheet toward the reel; a first laser tab cutting device for forming tabs at predetermined intervals on the positive electrode sheet transported by the first transport device; a second conveying device for conveying the strip-shaped negative electrode sheet toward the reel; a second laser tab cutting device for forming tabs at predetermined intervals on the negative electrode sheet transported by the second transport device; a winding device that rotates the winding shaft to wind up the positive electrode sheet having the tab formed thereon by the first laser tab cutting device and the negative electrode sheet having the tab formed thereon by the second laser tab cutting device; and Control device, The positive electrode sheet includes a strip-shaped positive electrode collector foil and a positive electrode active material layer, wherein the positive electrode active material layer is formed in a region of the strip-shaped positive electrode collector foil except for a non-formed region of a first edge portion set in a width direction. The negative electrode sheet includes a strip-shaped negative electrode collector foil and a negative electrode active material layer, wherein the negative electrode active material layer is formed in a region of the strip-shaped negative electrode collector foil except for a first edge portion set in a width direction where the negative electrode active material layer is not formed. The control device is configured to perform: A first process is to obtain the thickness of the positive electrode sheet wound on the winding shaft; a second process of obtaining the thickness of the negative electrode sheet wound on the winding shaft; A third process, based on the thickness of the positive electrode sheet wound on the reel relative to the rotation angle of the reel obtained in the first process, the first laser tab cutting process device adjusts the interval of the tabs formed in the unformed area of ​​the positive electrode sheet; as well as In a fourth process, the second laser tab cutting device adjusts the interval between the tabs formed in the unformed region of the negative electrode sheet based on the thickness of the negative electrode sheet wound around the reel relative to the rotation angle of the reel obtained in the second process.

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