Roll press device, press processing method, and solid-state battery

Abstract

To inhibit cracking of an end of a pressed member.SOLUTION: A roll press device 100 has a roller 30 which presses a pressed member M. The roller 30 has: a first roller part 31 which presses the pressed member M in a radial direction of the roller 30; second roller parts 32 which protrude in the radial direction farther than the first roller part 31 at each side as seen in an axis length direction of the roller 30 relative to the first roller part 31 and contact with the pressed member M from the axis length direction side. Each second roller part 32 has an elastic member E2 in at least a portion which contacts the pressed member M.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a roll press device that presses a member to be pressed. [Background technology]

[0002] In recent years, secondary batteries have been developed to reduce adverse environmental impacts. One type of secondary battery is a solid-state battery that has a solid electrolyte between the positive and negative electrodes. Electrodes in solid-state batteries are required to be densified (high density) in order to reduce electrical resistance at the interface between the electrodes and the solid electrolyte. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2012-530843 Summary of the Invention [Problem to be solved by the invention]

[0004] From the viewpoint of mass production of the electrode, the present inventors have considered pressing and densifying the plate electrode using a roll press device (e.g., Patent Document 1). However, when pressed in this manner, there is a risk of cracks (edge ​​cracks) occurring at the ends of the plate electrode in the width direction. In addition, the same problem can occur when pressing objects other than plate electrodes.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to suppress end cracks in a pressed member. [Means for solving the problem]

[0006] The inventors have realized that when a pressed member is pressed in the radial direction of a roller, if an appropriate load is also applied in the axial direction, the pressed member is less likely to crack at its ends, and have arrived at the present invention. The present invention relates to the following roll press devices (1) to (12), press processing methods (13) to (16), and a solid-state battery (17).

[0007] (1) A roll press device having a roller for pressing a workpiece, The roller has a first roller portion that presses the pressed member in a radial direction of the roller, and a second roller portion that protrudes in the radial direction from the first roller portion on each side of the axial length direction of the roller and abuts against the pressed member from the axial length direction side, A roll press device, wherein the second roller portion has an elastic member at least in a portion that contacts the member to be pressed.

[0008] According to the invention of (1) above, when the pressed member is pressed in the radial direction by the first roller unit, the pressed member can also be pressed in the axial direction by the second roller unit. Moreover, at this time, the second roller unit presses the pressed member in the axial direction by using an elastic member, so that an appropriate press load can be easily applied to the pressed member in the axial direction. In other words, for example, if the dimensional error of the pressed member is large, it is considered that the press load applied to the pressed member in the axial direction will also deviate from the expected load. In this regard, by using an elastic member in this manner, the error from the expected load can be suppressed. Therefore, the expected appropriate press load can be easily applied to the pressed member in the axial direction. As a result, when the pressed member is pressed in the radial direction of the roller, an appropriate press load can be easily applied in the axial direction, so that end cracks of the pressed member can be suppressed.

[0009] (2) A separate roller is provided to press the pressed member from the opposite side of the roller, the another roller has a third roller portion facing the first roller portion and an interference avoidance portion facing the second roller portion, an outer circumferential surface of the interference avoidance portion is located radially inward of the other roller than an outer circumferential surface of the third roller portion; The roll press device according to (1), wherein the second roller portion protrudes radially inward beyond an outer circumferential surface of the third roller portion.

[0010] According to the invention of (2) above, the contact area between the second roller part and the pressed workpiece is larger than when the second roller part protrudes only to the outer circumferential surface of the third roller part, and as a result, edge cracks in the pressed workpiece can be more efficiently suppressed.

[0011] (3) The roll press device according to (1) or (2), wherein the elastic member has a heat-resistant portion, including a surface that contacts the member to be pressed, that has a higher heat-resistant temperature than other portions.

[0012] According to the invention of (3) above, when the member to be pressed is pressed in a heated state, the heat-resistant portion can suppress damage to the elastic member.

[0013] (4) The roll press device according to any one of (1) to (3), wherein a coefficient of friction between the elastic member and the member to be pressed is 0.5 or less.

[0014] In the invention of (1) above, since the roller has the second roller portion, there is a risk that the pressed member may be more easily drawn in the direction of rotation of the roller than in the case where the roller does not have the second roller portion. In contrast, according to the invention of (4) above, since the coefficient of friction between the elastic member and the pressed member is 0.5 or less, such a drawback is suppressed.

[0015] (5) The roll press device according to any one of (1) to (4), wherein the elastic member has a modified portion at a portion that comes into contact with the member to be pressed. (6) The roll press apparatus according to (5) above, wherein the modification section is formed by fluorine-coating a surface of the elastic member.

[0016] According to the invention of (5) above, the heat resistance and durability can be improved by the modified part. According to the invention of (6) above, the modified part can be formed by fluorine coating.

[0017] (7) The roll press device according to any one of (1) to (6), wherein the elastic member has a plurality of elastic bodies having different elastic moduli.

[0018] According to the invention of (7) above, for example, it is possible to use an elastic body with relatively high durability and heat resistance for the part of the elastic member that directly contacts the member to be pressed, and an elastic body with relatively low durability and heat resistance for the other part, which leads to cost reduction.

[0019] (8) The roll press device according to (7) above, wherein at least one of the elastic bodies is made of acrylic rubber, fluororubber, or silicone rubber.

[0020] According to the invention of (8) above, the invention of (7) above can be implemented by using an elastic body made of these materials.

[0021] (9) The roll press apparatus according to any one of (1) to (8), wherein a portion of the roller including the elastic member is detachably attached to another portion of the roller.

[0022] According to the invention of (9) above, even if the elastic member is worn out, it is not necessary to replace the entire roller, but it is sufficient to replace only the part of the roller that includes the elastic member, which leads to cost reduction.

[0023] (10) The roll press device according to any one of (1) to (9), wherein the elastic member is a second elastic member, and the first roller portion has a first elastic member at least in a portion that contacts the member to be pressed.

[0024] According to the invention of (10) above, it becomes easy to apply an appropriate press load not only in the axial direction of the roller but also in the radial direction.

[0025] (11) The roll press apparatus according to (10), wherein the first elastic member and the second elastic member have different elastic moduli.

[0026] According to the invention (11) above, even when the flexibility required in the radial direction and the flexibility required in the axial direction of the roll press are different from each other, this can be accommodated by making the elastic modulus of the first elastic member and the elastic modulus of the second elastic member different from each other.

[0027] (12) The roll press apparatus according to any one of (1) to (11), wherein the member to be pressed is a plate electrode.

[0028] Plate electrodes (particularly plate electrodes for solid-state batteries) are required to be densified in order to reduce electrical resistance and are also required to be mass-produced. In this regard, according to the above-mentioned inventions (12) and (13), densified plate electrodes can be mass-produced by using a roll press device.

[0029] (13) A press processing method using a roll press device having a roller for pressing a member to be pressed, The roller has a first roller portion that presses the pressed member in a radial direction of the roller, and a second roller portion that protrudes in the radial direction from the first roller portion on each side of the axial length direction of the roller and abuts against the pressed member from the axial length direction side, The second roller portion has an elastic member at least in a portion that contacts the member to be pressed, A press processing method comprising a press step of pressing the pressed member in the radial direction by the first roller portion while pressing the pressed member in the axial direction by the second roller portion.

[0030] According to the invention of (13) above, the first roller portion and the second roller portion actually press the member to be pressed, thereby making it possible to suppress edge cracks.

[0031] (14) A press member heating step of heating the press member, The press processing method according to (13) above, wherein in the pressing step, the pressed member heated in the pressed member heating step is pressed.

[0032] According to the invention of (14) above, the pressed member that has been heated and softened is pressed, whereby the pressed member can be efficiently densified.

[0033] (15) A roller heating step of heating the roller, The press working method according to (13) or (14), wherein in the pressing step, the member to be pressed is pressed by the roller heated in the roller heating step.

[0034] According to the invention of (15) above, for example, when the member to be pressed is already heated, it is possible to prevent the heat of the member to be pressed from being taken away by the rollers. Also, for example, when the member to be pressed is not heated, it is possible to heat and soften the member to be pressed by the heated rollers and press it.

[0035] (16) The press working method according to any one of (13) to (15), wherein the pressed member is a plate electrode.

[0036] According to the invention (16) (press processing method), the same effects as those of the invention (12) (roll press device) can be obtained.

[0037] (17) A solid-state battery comprising: the plate electrode pressed by the roll press device according to (12) above; and a solid electrolyte in contact with the plate electrode.

[0038] According to the invention of (17) above, the plate electrode is densified, so that the electrical resistance at the interface between the plate electrode and the solid electrolyte is reduced. Moreover, edge cracking of the plate electrode is suppressed. Effect of the Invention

[0039] As described above, according to the present invention, when the pressed member is pressed in the radial direction of the roller, an appropriate load is also applied in the axial direction, thereby making it possible to prevent end cracks in the pressed member. [Brief description of the drawings]

[0040] [Figure 1] FIG. 1 is a perspective view showing a roll press device of a first embodiment. [Diagram 2] FIG. 2 is a front view showing the roll press apparatus. [Diagram 3] FIG. 2 is a front view showing a roll press device of a comparative example. [Figure 4] FIG. 11 is a perspective view showing a roll press device of a modified example. [Diagram 5] FIG. 2 is a schematic diagram showing a solid-state battery using the plate electrode produced in the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] Next, an embodiment of the present invention will be described with reference to the drawings. However, the present invention is not limited to the configuration of the following embodiment, and can be appropriately modified and implemented without departing from the spirit of the invention.

[0042] [First embodiment] FIG. 1 is a perspective view showing a roll press device 100 of this embodiment. The roll press device 100 includes an upper roller 30 as a roller for pressing a pressed member M from above, and a lower roller 40 as another roller for pressing the pressed member M from below, which are arranged in the vertical direction. The pressed member M is a plate-shaped electrode (positive electrode plate Mp, negative electrode plate Mn) of a solid-state battery 200 shown in FIG. 5. The roll press device 100 shown in FIG. 1 includes a power unit (not shown) for rotating the upper roller 30 and the lower roller 40, and a control device (not shown) for controlling the power unit. The roll speed of the roll press device 100 is about 100 to 200 m / min.

[0043] The upper roller 30 has an upper journal 39, a first roller portion 31, and two second roller portions 32. The first roller portion 31 and the two second roller portions 32 are attached to the upper journal 39 and rotate integrally with the upper journal 39. The first roller portion 31 protrudes radially outward from the upper journal 39. The second roller portions 32 protrude radially outward from the first roller portion 31 on one and the other sides in the axial length direction.

[0044] The lower roller 40 has a lower journal 49, a third roller portion 43, and two interference avoidance portions 42. The third roller portion 43 is attached to the lower journal 49 and rotates integrally with the lower journal 49. The third roller portion 43 protrudes radially outward from the lower journal 49 and faces the first roller portion 31. The length of the third roller portion 43 in the axial direction is approximately equal to the length of the first roller portion 31 in the axial direction.

[0045] The interference avoidance portion 42 is formed on or attached to the lower journal 49, and rotates integrally with the lower journal 49. The interference avoidance portion 42 faces the second roller portion 32. The outer peripheral surface of the interference avoidance portion 42 is provided radially inward from the outer peripheral surface of the third roller portion 43. By utilizing this interference avoidance portion 42, the outer peripheral surface of the second roller portion 32 protrudes radially inward from the outer peripheral surface of the third roller portion 43 to the lower roller 40. In other words, the lower end of the outer peripheral surface of the second roller portion 32 protrudes downward beyond the upper end of the outer peripheral surface of the third roller portion 43.

[0046] The first roller portion 31 is a roller that presses the pressed member M in a downward direction, which is the radially outward direction of the roller itself, and the third roller portion 43 is a roller that presses the pressed member M in an upward direction, which is the radially outward direction of the roller itself. The first roller portion 31 and the third roller portion 43 press the pressed member M inward in the thickness direction (inward in the up-down direction).

[0047] The two second roller portions 32 come into contact with the pressed material M from both sides in the width direction (both sides in the axial length direction of the rollers 30, 40) when the pressed material M is pressed inward in the thickness direction by the first roller portion 31 and the third roller portion 43. The pressed material M is pressed inward in the width direction by these two second roller portions 32.

[0048] Next, a specific configuration of each of the first to third roller parts 31, 32, 43 will be described. The first roller part 31 and the third roller part 43 may be entirely made of metal or the like, or may have elastic members E1, E3 in a portion including at least the surface that contacts the pressed member M (i.e., the outer circumferential surface) as shown in Fig. 1. In the latter case, the first roller part 31 and the third roller part 43 may have, for example, only the outer circumferential surface and its surroundings made of the elastic members E1, E3, or may be entirely made of the elastic members E1, E3.

[0049] Each second roller portion 32 has an elastic member E2 at least in a portion including the side surface on the side of the pressed member M. Specifically, each second roller portion 32 may be entirely made of the elastic member E2 as shown in Fig. 1, or only the side surface on the side of the pressed member M and its periphery may be made of the elastic member E2.

[0050] In the following, when the first roller unit 31 has an elastic member E1, the elastic member E1 is referred to as a "first elastic member E1", the elastic member E2 of the second roller unit 32 is referred to as a "second elastic member E2", and when the third roller unit 43 has an elastic member E3, the elastic member E3 is referred to as a "third elastic member E3". Examples of materials for the first to third elastic members E1 to E3 include acrylic rubber, fluororubber, and silicone rubber. More specifically, αGEL (registered trademark) is exemplified as the silicone rubber.

[0051] The elastic modulus of the first elastic member E1 and the elastic modulus of the second elastic member E2 are different from each other. This allows an appropriate press load to be applied to the pressed member M in the thickness direction (radial direction of the upper roller 30) and width direction (axial length direction of the upper roller 30). However, when the elastic modulus of the first elastic member E1 and the elastic modulus of the second elastic member E2 are the same, if an appropriate press load is applied to the thickness direction and width direction, respectively, the elastic modulus of the first elastic member E1 and the elastic modulus of the second elastic member E2 may be the same. For the same reason, the elastic modulus of the first elastic member E1 and the elastic modulus of the third elastic member E3 may be different or the same.

[0052] The portion of the upper roller 30 including the second elastic member E2 is detachably attached to the other portion of the upper roller 30. Specifically, the following three modes are exemplified. In the first mode, as shown in FIG. 1, the entire second roller portion 32 is made of the second elastic member E2, and the entire second roller portion 32 is detachably attached to the portion of the upper roller 30 other than the second roller portion 32. In the second mode, only a portion of the second roller portion 32 (including a side surface on the side that contacts the pressed member M) is made of the second elastic member E2, and only the second elastic member E2 is detachably attached to the other portion of the upper roller 30. In the third mode, only a portion of the second roller portion 32 is made of the second elastic member E2, but the entire second roller portion 32 is detachably attached to the portion of the upper roller 30 other than the second roller portion 32. The attachment may be achieved, for example, by fitting or the like, or by screws or the like, or by both of them.

[0053] A modified portion R2 is provided on the side surface of each second elastic member E2 facing the member to be pressed M by fluorine coating. The modified portion R2 constitutes a heat-resistant portion having a higher heat-resistant temperature than other portions of the second elastic member E2, and also constitutes a durable portion that is less susceptible to damage than other portions. The heat-resistant temperature of the modified portion R2 is approximately 250°C to 350°C. The coefficient of friction between the modified portion R2 of each second roller portion 32 and the member to be pressed M is 0.5 or less.

[0054] Similar to the side of the second elastic member E2, it is preferable that the outer peripheral surface of the first elastic member E1 is provided with a modified portion R1 formed by fluorine-coating the outer peripheral surface, and it is preferable that the outer peripheral surface of the third elastic member E3 is provided with a modified portion R3 formed by fluorine-coating the outer peripheral surface.

[0055] Next, a description will be given of a press working method performed using the above-described roll press apparatus 100. The press working method includes a roller heating step, a member to be pressed heating step, and a pressing step.

[0056] In the roller heating step, the rollers 30, 40 are heated by a roller heater or the like. At this time, for the upper roller 30, at least one of the first roller portion 31 and the second roller portion 32 is heated. However, it is preferable to heat both the first roller portion 31 and the second roller portion 32. Specifically, in this roller heating step, the rollers 30, 40 are heated to about 45°C to 200°C.

[0057] In the press member heating step, the press member M is heated to about 45° C. to 200° C. by a heater or the like for the press member upstream of the rollers 30 and 40. This causes the press member M to soften.

[0058] In the pressing step, the pressed member M that has been heated and softened in the pressed member heating step is pressed by the rollers 30, 40 that have been heated in the roller heating step, thereby densifying the pressed member M (plate-shaped electrode).

[0059] The effects of this embodiment will be described below with reference to Fig. 2 and Fig. 3. Fig. 2 is a front cross-sectional view showing the roll press apparatus 100 of this embodiment. Fig. 3 is a front cross-sectional view showing a roll press apparatus 100 of a comparative example in which both second roller units 32 are removed from the roll press apparatus 100 of this embodiment shown in Fig. 2.

[0060] 3, since there is no second roller unit 32, when the pressed workpiece M is pressed inward in the thickness direction by the first roller unit 31 and the third roller unit 43, part of the press load escapes outward in the width direction, which may cause cracks to occur at the ends of the pressed workpiece M in the width direction.

[0061] In this regard, in the pressing process of this embodiment shown in Fig. 2, the first roller unit 31 and the third roller unit 43 press the pressed material M inward in the thickness direction, while the two second roller units 32 press the pressed material M inward in the width direction. As a result, the pressed material M is pressed in each direction (four directions), the inward in the thickness direction (two directions) and the inward in the width direction (two directions), and the press load is less likely to escape to the outward in the width direction compared to the comparative example. As a result, edge cracks in the pressed material M are suppressed, leading to improved quality of the pressed material M.

[0062] Moreover, at this time, the pressed member M is pressed from both sides in the width direction by the second elastic member E2. Furthermore, when the first roller unit 31 has the first elastic member E1 and the third roller unit 43 has the third elastic member E3, the pressed member M is pressed from both sides in the thickness direction by the first and third elastic members E1 and E3. Therefore, it becomes easier to apply an appropriate press load to the pressed member M in each direction from the periphery. In other words, for example, if the dimensional error of the pressed member M is large, it is considered that the error from the expected load will also be large for the press load applied to the pressed member M in each direction from the periphery. In this regard, if the elastic members E1 to E3 are used in this way, the error from the expected load is suppressed, and it becomes easier to apply an appropriate press load to the pressed member M in each direction from the periphery. As a result, the end cracking of the pressed member M is efficiently suppressed.

[0063] Moreover, the second roller portion 32 utilizes the interference avoidance portion 42 to protrude downward below the upper end of the third roller portion 43. Therefore, the contact area between the second roller portion 32 and the pressed member M is larger than when the second roller portion 32 protrudes only up to the upper end of the third roller portion 43. As a result, in this respect as well, end cracks in the pressed member M are efficiently suppressed.

[0064] In addition, in this embodiment, the pressed member M is heated and softened in the press member heating step, and then pressed in the press step, so that the pressed member M can be densified more efficiently than in the case where it is not softened. Moreover, at this time, since each of the elastic members E1 to E3 has a heat-resistant portion made of the modified portions R1 to R3, it is possible to suppress the adverse effect that the elastic members E1 to E3 are damaged by the heated pressed member M.

[0065] Furthermore, according to this embodiment, the portion of the upper roller 30 including the second elastic member E2 is detachably attached to the other portion of the upper roller 30, so that even if the second elastic member E2 is worn out, it is not necessary to replace the entire upper roller 30, and it is sufficient to replace only the portion including the second elastic member E2, which leads to cost reduction.

[0066] In addition, in this embodiment, since the upper roller 30 has the second roller portion 32, there is a concern that the pressed member M may be more easily drawn in the rotation direction of the upper roller 30 compared to a comparative example that does not have the second roller portion 32. In this regard, since the coefficient of friction between the elastic member E2 of the second roller portion 32 and the pressed member M is 0.5 or less, such an adverse effect is suppressed.

[0067] In this embodiment, the pressed member M is a plate electrode (positive electrode plate Mp, negative electrode plate Mn) of a solid-state battery 200 shown in Fig. 5, and the plate electrodes are required to be densified in order to reduce electrical resistance, and are also required to be mass-produced. In this regard, according to this embodiment, the pressed member M is pressed by the roll press device 100, so that densified plate electrodes (positive electrode plate Mp, negative electrode plate Mn) can be mass-produced.

[0068] Specifically, the solid-state battery 200 has a positive electrode plate Mp and a negative electrode plate Mn as the pressed member M (plate-shaped electrode) pressed by the roll press device 100, and has a solid electrolyte S between the positive electrode plate Mp and the negative electrode plate Mn. In FIG. 5, the positive electrode plate Mp, the solid electrolyte S, and the negative electrode plate Mn are shown broadly in the stacking direction (horizontal direction in the figure) for visibility, but the stacking direction corresponds to the thickness direction of the positive electrode plate Mp and the negative electrode plate Mn. Since the positive electrode plate Mp and the negative electrode plate Mn are densified as described above, the electrical resistance at the interface between the positive electrode plate Mp and the solid electrolyte S and the electrical resistance at the interface between the negative electrode plate Mn and the solid electrolyte S are each reduced. Moreover, the positive electrode plate Mp and the negative electrode plate Mn are suppressed from cracking at the ends as described above. Therefore, the solid-state battery 200 is of high quality.

[0069] The embodiment described above can be modified as follows, for example.

[0070] (Modification 1) As shown in Fig. 4, the second elastic member E2 may have a plurality of elastic bodies E2a, E2b with different elastic moduli. Specifically, a portion of the second elastic member E2 including the side surface that contacts the pressed member M is made of an elastic body E2a having relatively high heat resistance and durability, and the other portion is made of another elastic body E2b having relatively low heat resistance and durability. In this case, for example, the former elastic body E2a constitutes the heat-resistant and durable portion of the second elastic member E2, so that fluorine coating can be omitted.

[0071] (Modification 2) The roll speed of the roll press device 100 may be set to less than 100 m / min, for example, and the press member heating step may be omitted. In the press step, the press member M may be heated and softened by the rollers 30, 40 heated in the roller heating step, and may be pressed. [Explanation of symbols]

[0072] 30 Upper roller 31 First roller section 32 Second roller section 40 Lower roller 43 3rd Roller Section 100 Roll press device 200 solid state battery E1 First elastic member E2 Second elastic member E2a Elastic body E2b Elastic body E3 Third elastic member R1 Modified part of the first roller R2 Modified part of the second roller R3 Modified part of the third roller M Pressed material Mp positive plate Mn negative plate S solid electrolyte

Claims

1. A roll press device having a roller for pressing a member to be pressed, The roller has a first roller portion that presses the pressed member in a radial direction of the roller, and a second roller portion that protrudes in the radial direction from the first roller portion on each side of the axial length direction of the roller and abuts against the pressed member from the axial length direction side, The second roller portion has an elastic member at least in a portion that contacts the member to be pressed, The elastic member has a plurality of elastic bodies each having a different elastic modulus. Roll press equipment.

2. A roll press device having a roller for pressing a member to be pressed, The roller has a first roller portion that presses the pressed member in a radial direction of the roller, and a second roller portion that protrudes in the radial direction from the first roller portion on each side of the axial length direction of the roller and abuts against the pressed member from the axial length direction side, In the roller, the first roller portion and the second roller portion are integrally configured so as to be immovable relative to each other, The second roller portion has an elastic member at least in a portion that contacts the member to be pressed, The elastic member has a plurality of elastic bodies each having a different elastic modulus. Roll press equipment.

3. The press machine has another roller that presses the pressed member from the opposite side of the roller, the other roller has a third roller portion facing the first roller portion and an interference avoidance portion facing the second roller portion, an outer circumferential surface of the interference avoidance portion is located radially inward of the other roller than an outer circumferential surface of the third roller portion; The roll press apparatus according to claim 1 , wherein the second roller portion protrudes radially inward beyond an outer circumferential surface of the third roller portion.

4. The roll press apparatus according to any one of claims 1 to 3, wherein the elastic member has a heat-resistant portion having a higher heat-resistant temperature than other portions, the heat-resistant portion including a surface that contacts the member to be pressed.

5. The roll press apparatus according to any one of claims 1 to 4, wherein a coefficient of friction between the elastic member and the member to be pressed is 0.5 or less.

6. The roll press apparatus according to any one of claims 1 to 5, wherein the elastic member has a modified portion at a portion that contacts the member to be pressed.

7. The roll press apparatus according to claim 6 , wherein the modified portion is formed by fluorine-coating a surface of the elastic member.

8. 8. The roll press device according to claim 1, wherein at least one of the elastic bodies is made of acrylic rubber, fluororubber, or silicone rubber.

9. The roll press apparatus according to any one of claims 1 to 8, wherein a portion of the roller including the elastic member is detachably attached to another portion of the roller.

10. The roll press device according to any one of claims 1 to 9, wherein the elastic member is a second elastic member, and the first roller portion has a first elastic member at least in a portion that contacts the member to be pressed.

11. The roll press apparatus according to claim 10 , wherein the first elastic member and the second elastic member have different elastic moduli.

12. The roll press apparatus according to any one of claims 1 to 11, wherein the pressed member is a plate electrode.

13. A press processing method using a roll press device having a roller for pressing a member to be pressed, The roller has a first roller portion that presses the pressed member in a radial direction of the roller, and a second roller portion that protrudes in the radial direction from the first roller portion on each side of the axial length direction of the roller and abuts against the pressed member from the axial length direction side, In the roller, the first roller portion and the second roller portion are integrally configured so as to be immovable relative to each other, The second roller portion has an elastic member at least in a portion that contacts the member to be pressed, The elastic member has a plurality of elastic bodies each having a different elastic modulus, A press processing method comprising a press step of pressing the pressed member in the radial direction by the first roller portion while pressing the pressed member in the axial direction by the second roller portion.

14. A pressed member heating step of heating the pressed member, The press working method according to claim 13, wherein in the pressing step, the pressed member heated in the pressed member heating step is pressed.

15. A roller heating step of heating the roller is provided.

15. The press working method according to claim 13, wherein in the pressing step, the member to be pressed is pressed by the roller heated in the roller heating step.

16. The press working method according to any one of claims 13 to 15, wherein the pressed member is a plate electrode.

17. A solid-state battery comprising: the plate electrode pressed by the roll press device according to claim 12; and a solid electrolyte in contact with the plate electrode.

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