Manufacturing apparatus for dry sheet for battery

Abstract

To provide a manufacturing apparatus for a dry sheet for a battery capable of controlling the sheet thickness in accordance with specifications.SOLUTION: A manufacturing apparatus for a dry sheet for a battery includes a support plate and a roller. The support plate has a first groove and a second groove on the support surface. The roller has a first protrusion and a second protrusion projecting from its surface. When stretching the material to be stretched, at least part of the first protrusion fits into the first groove, and at least part of the second protrusion fits into the second groove.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an apparatus for manufacturing a dry sheet for a battery. [Background technology]

[0002] With the remarkable development of electronics technology, portable electronic devices are becoming smaller, lighter, thinner, and more multifunctional. There is also a strong demand for batteries, which serve as the power source for electronic devices, to be smaller, lighter, thinner, more reliable, and safer. All-solid-state batteries, which use solid electrolytes, are attracting attention because they are safer than lithium-ion secondary batteries, which use liquid electrolytes.

[0003] An all-solid-state battery can be fabricated by preparing a cathode dry sheet, an anode dry sheet, and a solid electrolyte layer dry sheet and laminating them. For example, Patent Document 1 discloses a manufacturing device for processing sheet-like members. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 1-304910 Summary of the Invention [Problem to be solved by the invention]

[0005] If the thickness of the dry sheet for a battery varies or deviates from the specified thickness, the all-solid-state battery may not exhibit the desired performance. The dry sheet for a battery is a general term for the cathode dry sheet, the anode dry sheet, and the solid electrolyte layer dry sheet.

[0006] The present disclosure has been made in view of the above problems, and aims to provide a manufacturing device for a dry sheet for batteries that can control the thickness of the dry sheet according to specifications. [Means for solving the problem]

[0007] In order to solve the above problems, the following means are provided.

[0008] A manufacturing apparatus for a dry sheet for batteries according to a first aspect includes a support plate and a roller. The support plate has a support surface on which an object to be stretched is placed. The relative positional relationship between the support plate and the roller is variable in a first direction along a plane parallel to the support surface. The support plate has a first groove and a second groove on the support surface. The first groove extends in the first direction. The second groove extends in the first direction, spaced apart from the first groove, in a second direction perpendicular to the first direction. The roller has a first protrusion and a second protrusion protruding from its surface. When the object to be stretched is stretched, at least a portion of the first protrusion fits into the first groove, and at least a portion of the second protrusion fits into the second groove.

[0009] In the manufacturing device for a dry sheet for batteries according to the above aspect, the first protrusion and the second protrusion may each have a blade. [Effects of the Invention]

[0010] The manufacturing apparatus for a dry sheet for batteries according to the above embodiment can control the thickness of the dry sheet to meet specifications. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a manufacturing apparatus for a dry sheet for batteries according to an embodiment of the present invention. [Figure 2] FIG. 1 is a side view of a manufacturing apparatus for a dry sheet for batteries according to an embodiment of the present invention. [Figure 3] FIG. 1 is a plan view of a manufacturing apparatus for a dry sheet for batteries according to an embodiment of the present invention. [Figure 4] FIG. 1 is a cross-sectional view of a manufacturing apparatus for a dry sheet for batteries according to the present embodiment. [Figure 5] FIG. 10 is a cross-sectional view of a manufacturing device for a dry sheet for batteries according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present embodiment will be described in detail below with reference to the accompanying drawings. The drawings used in the following description may show characteristic portions enlarged for the sake of clarity, and the dimensional ratios of each component may differ from the actual ones. The materials, dimensions, etc. exemplified in the following description are merely examples, and the present disclosure is not limited thereto. Appropriate modifications may be made within the scope of the present disclosure.

[0013] The battery dry sheet manufacturing apparatus 100 is used to manufacture battery dry sheets, which is a general term for dry sheets for positive electrodes, negative electrodes, and solid electrolyte layers.

[0014] The positive electrode dry sheet is a sheet that serves as a base for the positive electrode mixture layer. The positive electrode dry sheet contains at least a positive electrode active material. The positive electrode dry sheet is, for example, obtained by drying a paste containing a positive electrode active material, a solid electrolyte, a conductive additive, and a binder.

[0015] The positive electrode active material is not particularly limited as long as it can reversibly absorb and release, and insert and extract (intercalate and deintercalate) lithium ions, and any positive electrode active material used in known all-solid-state batteries can be used. Examples of the positive electrode active material include lithium-containing metal oxides and lithium-containing metal phosphates.

[0016] Lithium-containing metal oxides include, for example, lithium cobalt oxide (LiCoO), lithium nickel oxide (LiNiO), lithium manganese spinel (LiMnO), and lithium manganese oxides represented by the general formula: LiNi x Co y Mn zComposite metal oxides represented by O2(x + y + z = 1), lithium vanadium compounds (LiVOPO4, Li3V2(PO4)3), olivine-type LiMPO4 (where M represents at least one selected from Co, Ni, Mn, Fe), lithium titanate (Li4Ti5O 12 ) and the like.

[0017] The positive electrode active material may also be one that does not contain lithium. Examples of such positive electrode active materials include lithium-free metal oxides (such as MnO2, V2O5), lithium-free metal sulfides (such as MoS2), lithium-free fluorides (such as FeF3, VF3), and the like. When using a positive electrode active material that does not contain lithium, lithium ions are doped into the negative electrode in advance, or a negative electrode containing lithium ions is used.

[0018] The solid electrolyte is, for example, an oxide-based solid electrolyte, a sulfide-based solid electrolyte, a complex hydride-based solid electrolyte, or a halide-based solid electrolyte. The solid electrolyte is, for example, a halide-based solid electrolyte.

[0019] The solid electrolyte may be represented by, for example, Li a E b G c X d ···(1). In formula (1), a satisfies 0.5 ≤ a < 6.0. b satisfies 0 < b < 2.0. c satisfies 0 ≤ c ≤ 6.0. d satisfies 0 < d ≤ 6.1.

[0020] In formula (1), E is at least one element selected from the group consisting of Al, Sc, Y, Zr, Hf, and lanthanoids. The lanthanoids are La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu.

[0021] In formula (1), G is, for example, OH, BO2, BO3, BO4, B3O6, B4O7, CO3, NO3, AlO2, SiO3, SiO4, Si2O7, Si3O9, Si4O 11 、Si6O 18, PO3, PO4, P2O7, P3O 10 , SO3, SO4, SO5, S2O3, S2O4, S2O5, S2O6, S2O7, S2O8, BF4, PF6, BOB, (COO)2, N, AlCl4, CF3SO3, CH3COO, CF3COO, OOC-(CH2)2-COO, OOC-CH2-COO, OOC-CH(OH)-CH(OH)-COO, OOC-CH(OH)-CH2-COO, C6H5SO3, OOC-CH=CH-COO, C(OH)(CH2COOH)2COO, AsO4, BiO4, CrO4, MnO4, PtF6, PtCl6, PtBr6, PtI6, SbO4, SeO4, TeO4, HCOO, and at least one group selected from the group consisting of O.

[0022] In formula (1), X is a halide atom, which is at least one element selected from the group consisting of Cl, F, Br, and I.

[0023] Examples of the halide-based solid electrolyte represented by formula (1) include Li2ZrCl6, Li2ZrSO4Cl4, Li2ZrSO3Cl4, Li2ZrPO3Cl4, Li2ZrCO3Cl4, and Li2Zr((COO)2) 0.5 Cl5, Li2Zr(CH3COO) 0.2 Cl 5.8 , Li2Zr(CF3COO) 0.2 Cl 5.8 , Li2Zr(HCOO) 0.4 Cl 5.6 , Li2ZrBO2Cl5, Li2ZrBF4Cl5, Li3YSO4Cl4, Li3YCO3Cl4, Li3YBO2Cl5, Li3YBF4Cl5, Li2ZrOCl4.

[0024] The conductive additive is a carbon material. Examples of the conductive additive include carbon powder, carbon nanotubes, carbon materials, metal fine powder, a mixture of carbon materials and metal fine powder, and conductive oxides. Examples of the carbon powder include carbon black, acetylene black, and ketjen black. Examples of the metal fine powder include powder of copper, nickel, stainless steel, iron, etc.

[0025] Examples of the binder include polyvinylidene fluoride (PVDF) or its copolymer, polytetrafluoroethylene (PTFE), polyamide (PA), polyimide (PI), polyamideimide (PAI), polybenzimidazole (PBI), polyethersulfone (PES), polyacrylic acid (PA) and its copolymer, metal ion crosslinked polyacrylic acid (PA) and its copolymer, maleic anhydride grafted polypropylene (PP), maleic anhydride grafted polyethylene (PE), and mixtures thereof. Polytetrafluoroethylene (PTFE) is particularly preferred as the binder.

[0026] The negative electrode dry sheet is a sheet that serves as a base for the negative electrode composite layer. The negative electrode dry sheet contains at least a negative electrode active material. The negative electrode dry sheet is, for example, obtained by drying a paste containing the negative electrode active material, a solid electrolyte, a conductive additive, and a binder.

[0027] The negative electrode active material may be any compound capable of absorbing and releasing ions, and known active materials used in lithium ion secondary batteries can be used. Examples of the negative electrode active material include carbon materials, metals or alloys capable of reacting with lithium, composite materials of these metals or alloys with carbon materials, oxides, sulfur-modified polyacrylonitrile, metallic lithium, etc. Examples of carbon materials include natural graphite, artificial graphite, mesocarbon microbeads, mesocarbon fiber (MCF), cokes, glassy carbon, and organic compound sintered bodies. Examples of metals or alloys capable of reacting with lithium include Si, SiO x , Sn, and aluminum. The oxides are lithium titanate (Li4Ti5O 12 ), SnO2, etc.

[0028] The solid electrolyte, conductive additive, and binder contained in the negative electrode dry sheet may be the same as those contained in the positive electrode dry sheet.

[0029] The dry sheet for a solid electrolyte layer is a sheet that serves as a base for a solid electrolyte layer. The dry sheet for a solid electrolyte layer contains at least a solid electrolyte. The dry sheet for a solid electrolyte layer is, for example, obtained by drying a paste containing a solid electrolyte. The solid electrolyte is, for example, one of those described above.

[0030] FIG. 1 is a perspective view of an apparatus 100 for manufacturing a dry sheet for batteries according to this embodiment. FIG. 2 is a side view of the apparatus 100 for manufacturing a dry sheet for batteries according to this embodiment. FIG. 3 is a plan view of the apparatus 100 for manufacturing a dry sheet for batteries according to this embodiment. FIG. 4 is a cross-sectional view of the apparatus 100 for manufacturing a dry sheet for batteries according to this embodiment. In FIGS. 1 to 4, a direction along a plane parallel to the support surface 15 is defined as the X direction, and a direction perpendicular to the X direction is defined as the Y direction. The X direction is an example of a first direction. In addition, in FIGS. 1 to 4, a direction perpendicular to the support surface 15 is defined as the Z direction.

[0031] The battery dry sheet manufacturing apparatus 100 includes a support plate 10 and a roller 20 .

[0032] The support plate 10 has a support surface 15 on which the object to be stretched 1 is placed, for example. The object to be stretched 1 is a base material for a cathode dry sheet, an anode dry sheet, or a solid electrolyte layer dry sheet. The object to be stretched 1 is, for example, a cathode composite paste, an anode composite paste, or a solid electrolyte paste.

[0033] The support plate 10 has a first groove 11, a second groove 12, a first guide 13, and a second guide 14.

[0034] The first groove 11 is a groove formed in the support surface 15. The first groove 11 is a groove extending in the X direction. In this specification, "extending in the X direction" means, for example, that the dimension in the X direction is larger than the smallest dimension among the dimensions in the X direction, Y direction, and Z direction. The same applies to extending in other directions. The depth of the first groove 11 is, for example, deeper than the protrusion height of the first protrusion portion 21 described below.

[0035] The second groove 12 is a groove formed in the support surface 15. The second groove 12 is a groove extending in the X direction. The second groove 12 is spaced apart from the first groove 11 in the Y direction. The second groove 12 is, for example, parallel to the first groove 11. The depth of the second groove 12 is, for example, deeper than the protrusion height of the second protrusion portion 22 described later.

[0036] The first guide 13 is located at a first end of the support plate 10 in the Y direction. The first guide 13 extends in the X direction. The first guide 13 is a portion that protrudes in the Z direction from the support surface 15. The first guide 13 and the first groove 11 may be adjacent to each other in the Y direction, or the first guide 13 and the first groove 11 may be spaced apart in the Y direction.

[0037] The second guide 14 is located at the second end of the support plate 10 in the Y direction. The second guide 14 extends in the X direction. The second guide 14 is a portion that protrudes in the Z direction from the support surface 15. The first guide 13 and the second guide 14 are formed, for example, parallel to each other. The second guide 14 and the second groove 12 may be adjacent to each other in the Y direction, or the second guide 14 and the second groove 12 may be spaced apart in the Y direction. The first groove 11 and the second groove 12 are located between the first guide 13 and the second guide 14 in the Y direction. The first guide 13 and the second guide 14 determine the thickness of the dry sheet after the object to be stretched 1 is stretched.

[0038] The material of the support plate 10 is preferably, for example, aluminum or SUS. Since halogen elements (especially Cl) contained in the halide-based solid electrolyte are corrosive, it is preferable to use a material that is resistant to corrosion.

[0039] The roller 20 is positioned opposite the support surface 15 of the support plate 10. The roller 20 is pressed against the object to be stretched 1, thereby stretching the object to be stretched 1. The relative positional relationship between the roller 20 and the support plate 10 in the X direction is variable. The roller 20 may move in the X direction relative to the support plate 10, or the support plate 10 may move in the X direction relative to the roller 20. The positional relationship between the roller 20 and the support plate 10 is controlled, for example, by an actuator. The actuator has, for example, a power source (for example, a motor) that translates the roller 20 or the support plate 10, and a control unit (for example, a CPU) that controls the translation.

[0040] The roller 20 may be movable in the Z direction. The movement of the roller 20 in the Z direction is controlled, for example, by an actuator. Making the position of the roller 20 variable in the Z direction makes it easier to place the object to be stretched 1 on the support plate 10 and also makes it possible to control the thickness of the object to be stretched 1 after stretching.

[0041] The roller 20 is a columnar or cylindrical member having a central axis in the Y direction. The roller 20 has a first protrusion 21 and a second protrusion 22 that protrude from the surface. The first protrusion 21 and the second protrusion 22 protrude in the radial direction from the outer surface. The first protrusion 21 and the second protrusion 22 are each annular portions that follow the outer periphery of the roller 20.

[0042] The first protrusion 21 and the second protrusion 22 are spaced apart in the Y direction. At least a portion of the first protrusion 21 is configured to fit into the first groove 11 when the object to be stretched 1 is stretched. At least a portion of the second protrusion 22 is configured to fit into the second groove 12 when the object to be stretched 1 is stretched. The height of the first protrusion 21 is smaller than the depth of the first groove 11, and the height of the second protrusion 22 is smaller than the depth of the second groove 12.

[0043] When the object to be stretched 1 is stretched, it is preferable that the first surface 211 on the inside in the Y direction of the first protrusion 21 contacts the first surface 111 on the inside in the Y direction of the first groove 11. The contact between the first surface 211 and the first surface 111 makes it easier to cut the object to be stretched 1 that is sticking out in the Y direction. Similarly, when the object to be stretched 1 is stretched, it is preferable that the first surface 221 on the inside in the Y direction of the second protrusion 22 contacts the first surface 121 on the inside in the Y direction of the second groove 12. The contact between the first surface 221 and the first surface 121 makes it easier to cut the object to be stretched 1 that is sticking out in the Y direction. By cutting the object to be stretched 1 that is sticking out in the Y direction and accommodating it in the first groove 11 and the second groove 12, it is possible to prevent the object to be stretched 1 from climbing up onto the first guide 13 and the second guide 14. If the object to be stretched 1 climbs onto the first guide 13 and the second guide 14, it may cause the thickness of the dry sheet after stretching the object to be stretched 1 to deviate from the set thickness.

[0044] 5 is a cross-sectional view of a modified manufacturing apparatus 101 for a dry sheet for batteries. The modified manufacturing apparatus 101 for a dry sheet for batteries differs from the manufacturing apparatus 100 for a dry sheet for batteries in that the first protrusions 21A and the second protrusions 22 have blades. When the first protrusions 21A and the second protrusions 22 have blades, the object to be stretched 1 protruding in the Y direction can be cut more easily.

[0045] The diameter of the roller 20 at the positions where the first protrusions 21A and the second protrusions 22 are not formed is preferably, for example, 15 mm or more and 30 mm or less. The width of the roller 20 in the Y direction can be designed arbitrarily according to the size of the dry sheet for batteries.

[0046] The roller 20 is preferably made of aluminum or stainless steel, which has high corrosion resistance.

[0047] The manufacturing apparatus 100 for the dry sheet for a battery may have a heater for heating the stretched object 1. By heating the stretched object 1 with the heater, it becomes easier to peel the stretched object 1 from the support plate 10. The heater, for example, heats the support surface 15 and indirectly heats the stretched object 1. The heater is disposed, for example, on the side opposite to the support surface 15 of the support plate 10. The heater heats the stretched object 1 placed on the support surface 15 to 35°C or higher and 45°C or lower.

[0048] The manufacturing apparatus 100 for the dry sheet for a battery may have a scraper. The scraper 40 is disposed at a position facing the surface of the roller 20 when stretching the stretched object 1. The tip of the scraper is close to the surface of the roller 20. The tip of the scraper may be in contact with the surface of the roller 20 or may be spaced apart from the surface of the roller 20. It is preferable that the tip of the scraper is spaced apart from the surface of the roller 20 at a certain distance. The scraper prevents the stretched object 1 from being wound around the roller 20.

[0049] When stretching the stretched object 1, it is preferable that the height position in the Z direction of the tip of the scraper is the same as the height position in the Z direction of the central axis of the roller 20 or is on the support surface 15 side from the height position in the Z direction of the central axis of the roller 20. When the contact point between the stretched object 1 to be stretched and the roller 20 is used as a reference for height, it is preferable that the height of the tip satisfies 0 < H < R / 2. R is the diameter of the roller 20. By having the tip of the scraper at an appropriate position, the thickness variation of the dry sheet when the stretched object 1 is stretched can be reduced.

[0050] The battery dry sheet manufacturing apparatus 100 according to this embodiment cuts the object 1 that protrudes in the Y direction using the first groove 11 and the first protrusion 21, and the second groove 12 and the second protrusion 22. The battery dry sheet manufacturing apparatus 100 according to this embodiment also uses the first guide 13 and the second guide 14 to prevent the object 1 that protrudes in the Y direction from climbing up onto the first guide 13 and the second guide 14. If the object 1 climbs up onto the first guide 13 and the second guide 14, the thickness of the dry sheet after stretching the object 1 will deviate from the set thickness. The battery dry sheet manufacturing apparatus 100 according to this embodiment cuts the object 1 while rolling it, thereby preventing the object 1 from climbing up onto the first guide 13 and the second guide 14 and controlling the thickness of the dry sheet after stretching the object 1 to a specified thickness.

[0051] Next, a method for manufacturing the dry sheet for a battery according to this embodiment will be described. The method for manufacturing the dry sheet for a battery according to this embodiment includes a placing step, a stretching step, and a peeling step.

[0052] In the placing step, the object to be stretched 1 is placed on a support plate 10. The object to be stretched 1 is, for example, a positive electrode composite paste, a negative electrode composite paste, or a solid electrolyte paste. The positive electrode composite paste is obtained by adding a positive electrode composite, which is a mixture of a positive electrode active material, a solid electrolyte, a conductive additive, and a binder, to a solvent. The negative electrode composite paste is obtained by adding a negative electrode composite, which is a mixture of a negative electrode active material, a solid electrolyte, a conductive additive, and a binder, to a solvent. The solid electrolyte paste is obtained by mixing a solid electrolyte and a binder and adding the mixture to a solvent. The solvent is, for example, heptane.

[0053] In the stretching step, the object to be stretched 1 is stretched. The object to be stretched 1 is sandwiched between the roller 20 and the support plate 10 and rolled in the X direction. For example, by moving the object to be stretched 1 in the X direction relative to the roller 20, the object to be stretched 1 is rolled in the X direction.

[0054] Furthermore, in the stretching process, the stretched object 1 protruding in the Y direction is cut off by the first groove 11 and the first protrusion 21, and the second groove 12 and the second protrusion 22. The thickness of the dry sheet after stretching the stretched object 1 can be set, for example, by the heights of the first guide 13 and the second guide 14.

[0055] In the drawing step, a scraper may be placed opposite the roller 20 that draws the material to be drawn 1. The height position of the tip of the scraper in the Z direction is preferably the same as the height position of the central axis of the roller 20 in the Z direction, or is located closer to the support surface 15 than the height position of the central axis of the roller 20 in the Z direction. The scraper prevents the material to be drawn 1 from being taken up by the roller 20.

[0056] The stretching speed in the stretching step is preferably 10 cm / s or more and 16 cm / s or less. By setting the stretching speed appropriately, it is possible to more effectively prevent the object to be stretched 1 from being wound around the roller.

[0057] In the stretching step, the temperature of the object 1 to be stretched is preferably set to 35°C or higher and 45°C or lower. Controlling the temperature in the stretching step increases the stretching efficiency of the object 1. The object 1 to be stretched is a precursor of a dry sheet for batteries, and the stretching efficiency of dry sheets for batteries tends to be high at around 35°C.

[0058] In the peeling step, the stretched object 1 (i.e., the dry sheet for batteries) is peeled off from the support plate 10. In the peeling step, the temperature of the stretched object 1 is preferably set to 35°C or higher and 45°C or lower. The dry sheet for batteries is easily damaged, and attempting to forcibly peel the dry sheet for batteries from the support plate 10 may result in damage to the dry sheet for batteries. When peeling the dry sheet for batteries from the support plate 10, heating the dry sheet for batteries to a predetermined temperature makes it easier to release the dry sheet for batteries, thereby reducing damage to the dry sheet for batteries.

[0059] An all-solid-state battery can be fabricated using the dry sheets for a battery fabricated by the above procedure. First, a dry sheet for a negative electrode, a dry sheet for a positive electrode, and a dry sheet for a solid electrolyte layer are fabricated by the above procedure.

[0060] Next, the negative electrode dry sheet and the positive electrode dry sheet are stacked and pressurized so that the solid electrolyte dry sheet is sandwiched between them. External terminals are connected to the positive and negative electrodes of the pressure-molded stack. After that, the stack connected to the external terminals is housed in an exterior case, and the opening of the exterior case is heat-sealed to seal it. Through these steps, an all-solid-state battery is obtained.

[0061] In the method for producing a dry sheet for a battery according to this embodiment, the material to be stretched 1 is cut while being rolled, so that the thickness of the dry sheet after stretching the material to be stretched 1 can be controlled to a specified thickness.

[0062] The above describes the embodiments of the present disclosure in detail with reference to the drawings. However, each configuration and combination thereof in each embodiment is an example, and addition, omission, substitution, and other modifications of the configuration are possible within the scope that does not deviate from the spirit of the present disclosure. [Example]

[0063] "Example 1" A halide-based solid electrolyte and a fluorine-based binder were prepared to produce a solid electrolyte composite. The mass ratio of the halide-based solid electrolyte to the fluorine-based binder in the solid electrolyte layer composite was halide-based solid electrolyte:fluorine-based binder = 99.25 wt%:0.75 wt%. These were placed in a sealed zirconia container for a planetary ball mill and mixed. The sealed container was covered with a lid, which was then screwed onto the container body. The space between the lid and the container was then sealed with polyimide tape. The polyimide tape has the effect of blocking moisture.

[0064] The mixed solid electrolyte composite was used as the object to be stretched 1, and the object to be stretched 1 was stretched. A support plate 10 used when stretching the object to be stretched 1 had a first groove 11 and a second groove 12 formed therein. A roller 20 used to stretch the object to be stretched 1 had a first protrusion 21A with a blade and a second protrusion 22A. When stretching the object to be stretched 1, the first protrusion 21A was fitted into the first groove 11, and the second protrusion 22A was fitted into the second groove 12. The thickness specification of the thickness t of the solid electrolyte dry sheet after stretching the object to be stretched 1 was t≦140 μm. The temperature of the object to be stretched 1 was set to 40°C.

[0065] A dry sheet for solid electrolytes of Example 1 was produced under the above conditions. Five samples were produced under the same conditions, and the average thickness of the dry sheet for solid electrolytes of each sample was determined. The average thickness was the average of thicknesses measured at five different measurement points in the X direction of the dry sheet for solid electrolytes. Then, the proportion of the five samples that met the thickness standard (t≦140) (in-spec rate) was determined. All five samples of Example 1 met the standard, and the in-spec rate was 100%.

[0066] "Comparative Example 1" Comparative Example 1 differs from Example 1 in that the support plate used did not have the first groove and the second groove, and the roller did not have the first protrusion and the second protrusion. The other conditions were the same as in Example 1, and the in-specification rate was determined. Of the five samples in Comparative Example 1, only one sample met the standard, and the in-specification rate was 20%.

[0067] The within-specification rate was higher in Example 1 than in Comparative Example 1. In Comparative Example 1, a part of the material to be stretched climbed onto the guide, and the thickness of the dry sheet after stretching did not meet the standard. [Explanation of symbols]

[0068] 1 Object to be stretched 10 Support plate 11 First groove 12 Second groove 13 First Guide 14 Second Guide 15 Support surface 20 Roller 21, 21A 1st protrusion 22, 22A 2nd protrusion 100, 101 Manufacturing equipment for dry sheets for batteries 111, 121, 211, 221 1st page

Claims

1. A support plate and a roller are provided, the support plate has a support surface on which an object to be stretched is placed, a relative positional relationship between the support plate and the roller is variable in a first direction along a plane parallel to the support surface; the support plate has a first groove and a second groove on the support surface; The first groove extends in the first direction, the second groove is spaced apart from the first groove in a second direction perpendicular to the first direction and extends in the first direction; the roller has a first protrusion and a second protrusion protruding from a surface thereof; The manufacturing device for a dry sheet for batteries is configured so that, when the object to be stretched is stretched, at least a portion of the first protrusion fits into the first groove and at least a portion of the second protrusion fits into the second groove.

2. The device for manufacturing a dry sheet for batteries according to claim 1 , wherein the first protrusion and the second protrusion each have a blade.

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