JPH1097872A - Layered product and formation of layered product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily construct a high quality layered product having rectangular cross section in a short time by forming a composite body of a curtain-like plate material and a second strip-like body after the curtain-like plate material is formed from a first strip-like body. SOLUTION: A negative electrode strip-like body adopted as a first strip-like body is formed by coating a paste 14 containing negative electrode active material on both sides of a strip-like copper foil 12. Similarly, a positive electrode strip-like body adopted as a second strip-like body is formed by coating a paste containing positive electrode active material on both sides of a strip-like aluminum foil 12. Moreover, the first strip-like body is divided into two equal parts in the longitudinal direction, and a curtain-like plate material for a curtain-like negative electrode having several sheet bodies is formed to insert the second strip-like body into the curtain-like plate material. After a composite body is formed by pinching the second strip-like body in the curtain-like plate material, a folded body of snake abdomen shape is formed by alternately folding the composite body to compact the folded body of snake abdomen shape. Thereby, a negative electrode plate 16 and a positive electrode plate 18 are alternately laminated so that a high quality layered product of rectangular cross section can be obtained in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate in which rectangular sheets of different types are alternately stacked, and a method of forming the laminate.

[0002]

2. Description of the Related Art As a conventional laminated body, as shown in FIG. 1, for example, a band-shaped body 1 and a band-shaped body 2 are laminated, and then spirally wound a predetermined number of times from one end to form a cylindrical spiral body 3. There is a laminated body formed by flattening the cylindrical spiral body in the radial direction. However, the gaps 4 are formed at the four corners of the rectangular cross section, and are not efficiently laminated on the rectangular cross section.

Further, as a laminate having a rectangular cross section, for example, as shown in FIG. 2, a strip 1 and a strip 2 are cut into rectangular sheets to form a sheet 5 and a sheet 6, respectively. There is a laminated body 7 formed by alternately laminating these sheet bodies. However, this laminated body is liable to be displaced between the sheet bodies, and is difficult to handle in order to prevent the dislocation from occurring, and has a problem that the quality is degraded due to the dislocation. Therefore, for example, the sheet bodies can be fixed to each other using a fixture such as a member capable of bundling the laminates, or the sheet bodies can be bonded to each other using an adhesive or the like to prevent the sheet bodies from shifting. However, there is a problem in that the volume of the entire laminate including these components becomes large or the weight becomes large due to a fixture or an adhesive.

Further, in order to form a high-quality laminate, it is necessary to prepare sheets of accurate dimensions one by one, and it is necessary to stack these sheets at a predetermined position accurately. In order to prevent the already stacked sheet bodies from shifting during the stacking, it is necessary to use an auxiliary tool such as a support, or to devise a device for preventing the shift such as stacking while bonding. Therefore,
In the conventional method for forming a laminate as described above, it takes time and effort to form a laminate with good quality, and the production efficiency of the laminate is low and the production cost is high.

Therefore, as disclosed in Japanese Patent Application Laid-Open No. 7-57716, there is a laminate in which a square sheet is inserted one by one into each concave portion of the bellows-like body. Although the deviation between the sheet-shaped portions is solved, there is still a problem in that the deviation from the concave portion of the sheet body is likely to occur.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a laminate having a rectangular cross section and in which a sheet constituting the laminate is unlikely to be displaced. The purpose is to do. Another object of the present invention is to provide a forming method capable of easily forming a high-quality laminate having a rectangular cross section in a short time.

[0007]

SUMMARY OF THE INVENTION The present inventor prepares a first band and a second band of different types, and firstly leaves a first end of one side of the first band at a predetermined pitch in the longitudinal direction. By cutting, a goodwill-like plate member having a plurality of first sheet bodies having cuts at predetermined intervals and surrounded by the cuts and one side end was formed. Subsequently, these sheet bodies are alternately bent in opposite directions around one side end as an axis, so that the adjacent first
At the boundary of the sheet body, the sheet is bent in the direction opposite to each other alternately and the other side end is opened. The second band-shaped body is inserted from the opened other side end of the sheet, and then the goodwill is inserted. The bent first sheet body of the plate was closed, and the second band was positioned between the first sheets of the goodwill to form a combination of the good sheet and the second band.
The obtained combined body was bent at the same time in a goodwill-shaped cut portion while alternately changing the bending direction, thereby forming a bellows-shaped folded body. Lastly, the folded body was sandwiched from both ends in the longitudinal direction and compressed to form a laminate. The present inventor has found that this laminate has a square cross section, and that these sheets are unlikely to be displaced. Further, by this forming method, different types of square sheets were laminated. The present inventors have found that a high-quality laminate can be easily formed in a short time, and have reached the present invention.

That is, in the laminate of the present invention, the first belt-shaped body has a goodwill shape having a plurality of cuts at predetermined intervals in a longitudinal direction except for one side end, and the bending direction is changed at a portion including the cuts. A first folded body composed of a plurality of first sheet bodies connected at the side end portions, and a second band-shaped body that is formed by being alternately folded and has the same interval as the predetermined interval in the longitudinal direction. And a second folded body composed of a plurality of second sheet bodies connected at a bent portion, wherein the first sheet body and the second It is characterized in that two sheets are alternately laminated.

Further, the method for forming a laminate of the present invention comprises the following steps:
By cutting at a predetermined pitch in the longitudinal direction while leaving one side end of the band-shaped body, a plurality of first sheet bodies having cuts at predetermined intervals and surrounded by the cut and the one side end are formed. Plate-like material forming step of forming a plate-like material,
The sheet body of the goodwill sheet material is alternately bent in the opposite direction with the one side end as an axis, and bent alternately in opposite directions at a boundary portion of the adjacent first sheet body, and the other side end is bent. A sheet bending step of forming a part having an open goodwill plate, inserting a second belt from the other open side end of the goodwill, and then closing the goodwill to close the second belt. A step of forming a combined body located between each of the first sheet bodies of the goodwill-like sheet material, and bending the obtained combined body at the same time in the goodwill-like cut portion by simultaneously changing the bending direction alternately, thereby forming a bellows-like shape. It is characterized by comprising a bellows-shaped bent body forming step of forming a bent body, and a laminated body forming step of forming a laminated body by sandwiching and compressing the bent body from both ends in the longitudinal direction.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The laminate of the present invention comprises a first folded body and a second folded body, and a first folded body of the first folded body.
The sheet body and the second sheet body of the second folded body are alternately stacked. This laminate has a square cross-section and thus is a square laminate. The first folded body has a first band-shaped body having a plurality of cuts at predetermined intervals in a longitudinal direction except for one side end, and is folded at a portion including the cut by changing a bending direction alternately. And a plurality of first sheets connected at the side end.

The dimensions and thickness of the first belt-shaped body, the predetermined interval and the length of the cut are not particularly limited, but the shapes, dimensions, thickness and number of the plurality of first sheets are determined by these. The desired shape, size, thickness, and number of sheets can be obtained by selecting the dimensions of the first strip and the length of the predetermined interval. Also, the material of the first band is not particularly limited, but the properties of the plurality of first sheets are determined by the material. By selecting the material of the first band, the first sheet is selected. Can have desired properties.

[0012] The second folded body is formed by folding the second band-shaped body in the longitudinal direction at the same interval as the above-mentioned predetermined interval while alternately changing the bending direction, and comprises a plurality of connected at the folded portions. It consists of a second sheet body.
Although the size of the second belt-shaped body is not limited, if the number of the first sheet body of the first folded body and the number of the second sheet body of the second folded body are the same, the dimension is the first.
Desirably, the dimensions are the same as the dimensions of the strip. Also, the second
Although there is no particular limitation on the thickness of the band,
The thickness of the second sheet body is determined by this, and a desired second sheet body can be obtained by selecting the thickness of the second belt-shaped body.

The material of the second band is not particularly limited, but the properties of the plurality of second sheets are determined by the material. By selecting the material of the second band, the material of the second band is selected. Desired properties can be imparted to the two-sheet body. Further, by selecting the material of the first belt and the material of the second belt to form a certain combination of the properties of the first sheet and the properties of the second sheet, certain characteristics can be obtained in the laminate. By selecting these combinations, desired characteristics can be imparted to the laminate.

In the laminate of the present invention, it is preferable that a separator is interposed between the first sheet and the second sheet. The separator can control chemical interaction, electrical interaction, and the like occurring between the first sheet member and the second sheet member, and can impart special characteristics to the laminate. Controlling chemical interactions, for example, by limiting the movement of some types of substances that may occur between the first and second sheets to only the movement of certain substances The chemical reaction that can occur between the first sheet and the second sheet can be limited. Further, by controlling the electrical interaction, for example, by using this separator as an insulator, electricity that can flow between the first sheet body and the second sheet body can be insulated.

At this time, it is desirable that the first folded body and the second folded body are respectively positive and negative electrodes of the battery.
Thereby, the laminated body can function as a battery. At this time, by selecting the material of the first folded body and the second folded body and the material of the separator, a battery having a specific function can be obtained. At this time, it is desirable that the battery having a specific function is a lithium secondary battery. In this case, the first sheet body and the second sheet body are made of a material containing a positive electrode active material and a material containing a negative electrode active material, and lithium ions move reversibly between the first sheet body and the second sheet body. It is necessary to be able to. At this time, lithium manganese oxide or the like can be used as the positive electrode active material, and carbon can be used as the negative electrode active material.

Alternatively, it is desirable that the first folded body and the second folded body are respectively positive and negative electrodes of a capacitor. In this case, each of the first sheet member and the second sheet member is preferably made of a conductor having a low electric resistivity, and is preferably made of, for example, a metal foil. The method for forming a laminate of the present invention comprises five steps: a goodwill-like plate material forming step, a sheet body bending step, a combination body forming step, a bellows-shaped folded body forming step, and a laminate forming step, and these steps are performed in this order. This is a continuous forming method.

In the step of forming the goodwill-like plate, the first strip is cut at a predetermined pitch in the longitudinal direction while leaving one side end of the first strip, so that the first strip has a cut at a predetermined interval, and the cut and the one side end are cut. This is a step of forming a goodwill-shaped plate member having a plurality of first sheet members surrounded by. In this step, the dimensions and thickness of the first strip, the predetermined interval, and the length of the cut are not particularly limited, but the plurality of first bands surrounded by the cut and the one side end are not particularly limited. Sheet shape,
The dimensions, thickness, and number of sheets are determined by these, and the desired shape, dimensions, thickness, and number of sheets can be obtained by selecting the dimensions of the first strip and the length of the predetermined interval, respectively. Further, a cutting method is selected according to the thickness, material, and the like of the first belt-shaped body.

In the sheet-like partial bending step, the sheet body of the goodwill-like plate material is alternately bent in the opposite direction with the one side end as an axis, and alternately at a boundary portion between the adjacent first sheet bodies. This is a process in which a curving plate is bent in a direction opposite to the above, and the other side end is opened. In this step, the degree of bending is not particularly limited, but it is necessary to bend at least to such an extent that the second band-shaped body having a predetermined thickness can be completely inserted into the open side end.

In this step, the method of bending is not particularly limited, but each of the first sheets of the first belt-like body can be bent by static electricity, wind pressure or the like. In particular, it is desirable to bend each of the first sheet members of the goodwill plate material by wind pressure.
This wind pressure can be applied to the first sheet body of any material irrespective of the material of the first sheet body, and can be applied by using a simple device that can blow wind such as air. Therefore, by using wind pressure, the first
The sheet body can be easily bent. Further, the first sheet body can be bent without damaging it. further,
You can adjust the wind pressure by adjusting the amount of blowing wind,
The degree of bending can be arbitrarily set.

In the combined body forming step, the second belt-like body is inserted from the other side end of the goodwill-like plate which is opened, and then the second belt-like body is closed, whereby the second belt-like body is closed. This is a step of forming a combined body located between the first sheet bodies of the plate material. In this step, the insertion method is not particularly limited, and the second band can be set at a predetermined insertion position by using a robot that can carry the second band freely.

In the above-mentioned step of forming the good sheet material, by making the length of the cut of the good sheet material as large as possible, a second belt-like body having a large width can be used, and the size of the second sheet body can be reduced. Can be bigger. Although the closing method is not particularly limited, if each of the first sheets of the goodwill plate is elastically deformed, the sheet is naturally closed by removing the pressure applied to the sheet. Also, even if it is plastically deformed,
It can be closed by applying pressure from the direction opposite to the bending direction using wind pressure or the like.

The step of forming a bellows-shaped folded body is a step of forming the bellows-shaped folded body by simultaneously bending the obtained combined body at the goodwill-shaped cut portion while alternately changing the bending direction. In this step, the bending method is not particularly limited, but the bent portion of the combined body of the positive electrode band and the negative electrode band is movable in the longitudinal direction but can be fixed in the vertical direction. Thus, pressure can be applied to the sheet from either the upper or lower direction, and at the same time, the combined body can be folded in a bellows shape by applying a compressive force from the longitudinal direction of the combined body.

The laminated body forming step is a step of forming a laminated body by sandwiching and compressing the bent body from both ends in the longitudinal direction. In this step, the compression method is not particularly limited, but a plate or the like is applied to both ends in the longitudinal direction of the bent body, and the folded body can be compressed from both sides in a state of being sandwiched between the plates and the like.

[0024]

The laminated body of the present invention has a square cross section and a high lamination density because the first sheet body and the second sheet body are rectangular. In addition, since the first folded body and the second folded body are fixedly combined with each other at the cuts and the bent portions, the first sheet body and the second sheet body are less likely to be displaced. . Therefore, there is no need to prevent displacement, and handling is easy.

Furthermore, by using the laminate of the present invention for the positive and negative electrodes of a prismatic lithium secondary battery, the energy density of the battery can be increased. In the method for forming a laminate according to the present invention, since the processing and the like performed in each step can be performed with high accuracy, a high-quality laminate can be formed. Specifically, the following two are particularly noteworthy. One is that the preparation of the first band and the second band can be performed with higher dimensional accuracy and easier than preparing a single rectangular sheet one by one. Second, in the combined body forming step, the goodwill-like plate members are firmly fixed to each other so as to sandwich the second belt-like body and are combined with each other. Is less likely to occur, and processing can be performed easily and accurately in subsequent steps.

Further, since the processing contents in each step are only simple mechanical processing such as cutting, bending, insertion, bending, compression, etc., the steps can be easily carried out, and a laminated body can be easily produced. it can. In addition, since the number of steps is small and the time required in each step is short, a laminate can be produced in a short time.

[0027]

The present invention will be described below in detail with reference to examples. (Example 1) In this example, a negative electrode band formed by applying a paste containing a negative electrode active material on both sides of a band-shaped copper foil was used as a first band, and a positive electrode active material was used as a second band. The first sheet body is a first folded body in which the first sheet body is a negative electrode plate and the second sheet body is a positive electrode plate in which the paste containing This was implemented as a positive and negative electrode of a prismatic lithium secondary battery comprising a two-folded body, and a negative electrode plate and a positive electrode plate were alternately laminated. 3 and 4 show a plan view and a right side view of the positive and negative electrodes of this lithium secondary battery. FIG. 5 is a cross-sectional view taken along the line AA in FIG.

In this embodiment, the copper foil 12 has a thickness of 0.1 mm.
A paste having a size of 018 mm, a width of 44 mm, and a belt length of 590 mm was used. As the paste 14 containing the negative electrode active material, a carbon paste composed of carbon and a binder was used.
This carbon paste was applied to a copper foil with a thickness of 0.07 mm to form a negative electrode strip, and a folded body having a plurality of negative electrode plates 16 was formed. Also, as aluminum foil,
A paste having a thickness of 0.02 mm, a width of 39 mm, and a belt length of 556 mm is used. As the paste containing the positive electrode active material, a lithium paste composed of lithium manganese oxide and a binder is used. A 13 mm-thick coating was performed to form a positive electrode strip, and a folded body having a plurality of positive electrode plates 18 was formed. The folded body having the positive electrode plate 18 was completely wrapped with a separator made of polyethylene.

At this time, the cut length of the strip for the negative electrode was set to 41.5 mm, and the strips for the negative electrode and the positive electrode were each bent at a predetermined interval of 32.8 mm to obtain 32.8 mm. A positive / negative electrode laminate was formed by alternately stacking 35 sheets of the first sheet member and the second sheet member each having a size of × 44 mm with a separator interposed therebetween.

The positive and negative electrodes of this lithium secondary battery were formed as follows. First, in order to form a strip for the negative electrode, a strip formed by applying a carbon paste 26 to both surfaces of a strip-shaped copper foil 24 having slit holes 22 as shown in FIG. 6 was formed. This strip has a width of 88 mm and a strip length of 5 mm.
A 90 mm strip-shaped copper foil is prepared, slit holes are provided at predetermined intervals while leaving both ends 28, 28, and a carbon paste is applied to portions other than both ends 28, 28 on both surfaces of the copper foil. . As shown in FIG. 7, the strip was divided into two parts at a central portion along the longitudinal direction, and two pieces of a good-negative goodwill plate 32 having a plurality of sheets 30 were formed.

Also, two strip-shaped aluminum foils having a width of 39 mm and a strip length of 556 mm were prepared, and a lithium paste was applied to both sides of these aluminum foils except for a bent portion at a predetermined interval. 2 strips 34
Sheets were formed. Each of these positive electrode strips was 83 mm
A 558 mm separator 36 is inserted into the folded two, and the overlapping portion 38 of the separator around the band is fused between the separators 36 as shown in FIG. 9 so that the positive band 34 is completely attached to the separator. Two wrapped pieces were formed.

The two negative-plate sheets 32 for the negative electrode were
11 was placed on a pallet 42 having a plurality of hollow holes 40 at predetermined positions, and the sheet to be bent overlapped the hollow holes 40 as shown in FIG. An air blow 44 is blown from below the hollow hole 40 onto the sheet body overlapping the hollow hole 40, and the sheet body is bent by the wind pressure as shown in FIG. 12 to open one side end of the negative-plate-like plate 32. Was.

Subsequently, as shown in FIG. 13, the belt 47 for the positive electrode is moved to the vacuum chuck 46 by using a robot 47 to which a vacuum chuck 46 is attached.
And inserted into the open side end 48 of the negative-electrode goodwill 32. After removing the vacuum chuck 46 from the positive electrode band 34 wrapped in the separator 36 and installing the positive electrode band 34 at a predetermined position on the open side end 48, stop blowing the air blow 44 onto the sheet member. The sheet body bent by the wind pressure was closed to form two combined bodies 49 each having the positive electrode band 34 sandwiched between the negative electrode plate members 32 as shown in FIG.

As shown in FIG. 15, an apparatus 50 capable of moving the bent portion of the combination 49 in the horizontal direction but fixing it in the vertical direction as shown in FIG. 15 is used. The bending direction was alternately changed to form two bellows-shaped bent bodies 60 as shown in FIG. The device 50 used at this time includes a pressing body 62 capable of pressing every other bent portion 52 against the pallet, an elastic body 64 capable of moving the pressing body 62 in the horizontal direction by expansion and contraction, A guide bar 66 that allows the pressing body 62 to slide only in the horizontal direction is provided, and as shown in FIG. 15, cooperates with the air blow 44 that blows the combination body 49 from below the hollow hole 40 of the pallet 42. Thus, the combination 49 was bent in a bellows shape by simultaneously applying the wind pressure from below and the pressing from above and from the side.

As shown in FIG. 17, the bellows-shaped folded body 60 is provided with a single plate 70 at each of both ends in the longitudinal direction, and the stacked body 72 is compressed from both ends thereof through this plate. Two were formed. The laminate obtained by the above-described forming method was used as a laminate of positive and negative electrodes. (Embodiment 2) In this embodiment, a rectangular capacitor is formed by alternately stacking two conductor plates facing each other with a dielectric plate interposed therebetween. At this time, a band made of aluminum foil was used as the first band and the second band. Therefore, the first sheet member and the second sheet member correspond to two conductor plates facing each other. The separator corresponds to the dielectric plate.

In forming this capacitor, it is made of aluminum foil and has a thickness of 0.018 mm and a width of 48 m.
m, a belt-like material for a positive electrode and a negative plate for a negative electrode are formed by using two first belts and a second belt having the same length of 1530 mm, a length of a cut is set to 45 mm, and a length of a predetermined interval is set. Was set to 30 mm, and a laminate was formed in the same manner as in Example 1 except that a dielectric made of polypropylene was used as a separator, and this laminate was used as a positive electrode and a negative electrode of a capacitor.

[0037]

The laminate of the present invention can be used for products having a laminated structure having a rectangular cross section. Further, since the sheet body is unlikely to be displaced, the quality of the product having the laminated structure is improved, and the product can be easily handled. In particular, a prismatic lithium secondary battery using the laminate of the present invention can be used as a battery for a portable electric device, an electric vehicle, or the like because the energy density of the battery is large.

According to the method of forming a laminate of the present invention, a laminate can be formed easily, with good quality, in a short time, so that a laminate with high production efficiency can be produced. In addition, the process can be automated, and mass production with a high yield can be achieved by using computer control or the like. Further, in the method for forming a laminate of the present invention, since the preparation of raw materials is easy,
Lower material costs. Furthermore, the equipment required by this forming method is a simple one that can be automated and controlled by a computer, so that labor costs, overhead costs, and the like can be reduced. Accordingly, the material costs, labor costs, overhead costs, and the like can be reduced in this way, and thus the production costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a prior art laminate comprising tubular spirals of different types of strips.

FIG. 2 is a perspective view of a conventional laminated body formed by alternately laminating different types of sheet bodies.

FIG. 3 is a plan view of positive and negative electrodes of the lithium secondary battery of Example 1.

FIG. 4 is a right side view of positive and negative electrodes of the lithium secondary battery of Example 1.

FIG. 5 is a cross-sectional view of the positive and negative electrodes of the lithium secondary battery of Example 1 taken along the line AA in FIG. 3;

FIG. 6 is a plan view showing a band-shaped body in which a carbon paste is applied to both surfaces of a band-shaped copper foil having slit holes according to the first embodiment.

FIG. 7 is a perspective view showing a good-shaped negative electrode-like plate material of Example 1;

FIG. 8 is a plan view illustrating a positive electrode band of Example 1. FIG.

FIG. 9 is a plan view showing a positive electrode band wrapped in the separator of Example 1.

FIG. 10 is a perspective view of a pallet having a hollow hole used in the first embodiment.

FIG. 11 is a perspective view showing a state in which a pallet and a pallet for negative electrode of Example 1 are stacked.

FIG. 12 is a perspective view showing a state in which a sheet body of a negative-plate-like good plate material for the negative electrode of Example 1 is bent.

FIG. 13 is a perspective view showing the manner in which the positive electrode band of Example 1 is inserted into the open side end of the negative electrode plate.

FIG. 14 is a perspective view showing a combined body of the positive electrode band and the negative electrode plate-like material of Example 1.

FIG. 15 is a front view of an apparatus used when the combination body of Example 1 is bent at the same time in a goodwill cut portion while alternately changing the bending direction.

FIG. 16 is a perspective view of a bellows-shaped bent body according to the first embodiment.

FIG. 17 is a perspective view showing a state in which the bellows-shaped bent body of the first embodiment is compressed from both ends in the longitudinal direction.

[Explanation of symbols]

12: Copper foil 14: Paste containing negative electrode active material 16:
Negative electrode plate 18: Positive electrode plate

Claims (7)

[Claims] 1. A first belt-shaped body having a plurality of cuts at predetermined intervals in a longitudinal direction except for one side end, and having a plurality of cuts, and being folded by changing a bending direction alternately at a portion including the cuts. A first folded body composed of a plurality of first sheet bodies connected at the side end portions, and a second belt-like body alternately bends in a longitudinal direction at the same interval as the predetermined interval. And a second folded body composed of a plurality of second sheets connected at a bent portion, wherein the first sheet and the second sheet are alternately formed. A laminate characterized by being laminated. 2. The laminate according to claim 1, wherein a separator is interposed between said first sheet member and said second sheet member. 3. The laminated body according to claim 2, wherein the first folded body and the second folded body are positive and negative electrodes of a battery, respectively. 4. The battery according to claim 3, wherein the battery is a lithium secondary battery.
The laminate according to item 1. 5. The laminated body according to claim 2, wherein said first folded body and said second folded body are respectively positive and negative electrodes of a capacitor. 6. The first band-shaped body is cut at a predetermined pitch in a longitudinal direction while leaving one side end portion of the first band-shaped body. The first band-shaped body has a cut at a predetermined interval and is surrounded by the cut and the one side end. 1
A step of forming a goodwill-like plate material having a plurality of sheet bodies, and alternately bending the sheet body of the goodwill plate material in the opposite direction with the one side end portion serving as an axis. A sheet bending step of alternately bending in opposite directions at a boundary portion of the first sheet member to form a good-curved plate material having the other side end opened; Inserting a belt-like body, then closing the goodwill plate and closing the second belt-like body between each of the first sheet bodies of the goodwill-like sheet material; A bending step of forming a bellows-shaped bent body by alternately changing the bending directions at the same time at the cut portion of the plate-shaped material, and forming a bellows-shaped bent body; Laminate forming body A method for forming a laminate, comprising: a forming step. 7. The method for forming a laminate according to claim 6, wherein in the step of bending the sheet body of the goodwill sheet material, each of the first sheet portions of the goodwill sheet material is bent by wind pressure.