Solid electrolyte preparation device and preparation method

Abstract

The invention discloses a solid electrolyte preparation device and a preparation method, the solid electrolyte preparation device comprises a first compression roller assembly and a second compression roller assembly, the first compression roller assembly and the second compression roller assembly are arranged at an interval; and the coating assembly is arranged between the first compression roller assembly and the second compression roller assembly, and is positioned above the first compression roller assembly and the second compression roller assembly in the vertical direction. According to the technical scheme provided by the invention, the first membrane and the first powder are compounded together through the second compression roller assembly to form the first composite membrane, and the first composite membrane is thinned, so that the condition that the first membrane or the second membrane is fractured when the first membrane or the second membrane is independently thinned to the preset thickness can be reduced; therefore, the quality of the first composite membrane can be improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a solid electrolyte preparation device and preparation method. Background Art

[0002] In the production and manufacturing of solid-state lithium batteries, the inherent characteristics of the dry electrode process (solvent-free, high elasticity, high density, and high compatibility) are highly consistent with solid-state battery technology.

[0003] In related technologies, when preparing electrolyte membranes using a dry process, a single electrolyte membrane is usually prepared. However, the required thickness of the electrolyte membrane is relatively thin, and the membrane will break during the thinning process. Therefore, the electrolyte membrane thickness requirement of high-energy-density solid-state batteries cannot be met. Summary of the Invention

[0004] One purpose of the embodiments of the present application is to provide a solid electrolyte preparation device and preparation method.

[0005] According to a first aspect of an embodiment of the present application, a solid electrolyte preparation device is provided, comprising:

[0006] a first pressing roller assembly and a second pressing roller assembly, wherein the first pressing roller assembly and the second pressing roller assembly are spaced apart from each other;

[0007] The coating assembly is arranged between the first pressing roller assembly and the second pressing roller assembly, and is located above the first pressing roller assembly and the second pressing roller assembly in a vertical direction.

[0008] Optionally, the first pressing roller assembly includes a plurality of first rollers, and the plurality of first rollers are arranged at intervals along the horizontal direction;

[0009] The second pressing roller assembly includes a second roller and a third roller. The third roller is spaced apart from the second roller and is located above the second roller in a vertical direction.

[0010] Optionally, a tangent line between the first roller and the second roller close to the coating assembly is parallel to the horizontal axis.

[0011] Optionally, the second pressing roller assembly further includes at least one fourth roller, the fourth roller is spaced apart from the second roller, and the fourth roller is spaced apart from the third roller along the circumference of the second roller.

[0012] Optionally, the diameter of the third roller is smaller than the diameter of the second roller, and the diameter of the fourth roller is smaller than the diameter of the second roller.

[0013] Optionally, the second pressing roller assembly further includes at least one fifth roller, and the fifth roller is spaced apart from the second roller in the horizontal direction.

[0014] Optionally, the second pressing roller assembly further includes a fourth roller and at least one fifth roller, the fourth roller is spaced apart from the second roller, the fourth roller is spaced apart from the third roller along the circumference of the second roller, and the fifth roller is spaced apart from the second roller along the horizontal direction;

[0015] The line between the center of the third roller and the center of the second roller is a first line, the line between the center of the fourth roller and the center of the second roller is a second line, and an angle M is formed between the second line and the first line, where M is an acute angle.

[0016] Optionally, the solid electrolyte preparation device further includes a blanking assembly, which is located above two adjacent first rollers in the vertical direction.

[0017] Optionally, the solid electrolyte preparation device further includes a unwinding assembly, which is arranged between two adjacent first rollers, and the unwinding assembly is spaced apart from the blanking assembly.

[0018] According to a second aspect of an embodiment of the present application, a method for preparing a solid electrolyte is provided, the method comprising:

[0019] S1, the first pressing roller assembly conveys and calenders the first film to the second pressing roller assembly;

[0020] S2, the coating component releases the first powder toward the side of the first membrane facing the coating component;

[0021] S3. The second pressing roller assembly composites the first membrane sheet and the first powder material together to form a first composite membrane sheet including the first membrane sheet and the second membrane sheet, and thins the first composite membrane sheet.

[0022] Optionally, the first membrane includes a first sub-membrane and a substrate;

[0023] In S1 , the unwinding assembly releases the substrate to the first pressing roller assembly, and the first pressing roller assembly combines the first sub-film and the substrate to form a first film.

[0024] Optionally, the first sub-membrane is an electrode membrane, and the second sub-membrane is an electrolyte membrane.

[0025] Optionally, the substrate is a current collector or a release film.

[0026] One technical effect of an embodiment of the present application is that the second pressing roller assembly compounds the first diaphragm and the first powder together to form a first composite diaphragm and thins the first composite diaphragm, thereby reducing the risk of breakage when the first diaphragm or the second diaphragm is thinned to a preset thickness alone, thereby improving the quality of the first composite diaphragm.

[0027] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0029] Figure 1 Schematic diagram of the structure of a solid electrolyte preparation device in an embodiment of the present application;

[0030] Figure 2 Schematic diagram of the structure of a solid electrolyte preparation device in an embodiment of the present application;

[0031] Figure 3 Schematic diagram of the structure of the first composite membrane in the embodiment of the present application.

[0032] Explanation of the accompanying drawings: solid electrolyte preparation device 100; first pressure roller assembly 1; first roller 11; blanking area 12; second pressure roller assembly 2; second roller 21; third roller 22; fourth roller 23; fifth roller 24; coating assembly 3; blanking assembly 4; unwinding assembly 5; winding assembly 6; first membrane a; first sub-membrane a1; substrate a2; second membrane b; first composite membrane c; first connecting line A; second connecting line B. DETAILED DESCRIPTION

[0033] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0035] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0036] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0037] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0038] In the specification and claims of the present invention, references to features using the terms "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. Furthermore, in the specification and claims, "and / or" refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, these terms may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0041] First, the horizontal and vertical directions mentioned in the embodiments of this application are shown in the attached Figure 1 and Figure 2 The marked direction, where the horizontal axis intersects the vertical axis.

[0042] Among them, if the solid electrolyte preparation device is placed on the ground, the horizontal axis is basically parallel to the ground; if the solid electrolyte preparation device is placed on a platform, the horizontal axis is basically parallel to the surface of the platform where the solid electrolyte preparation device is placed.

[0043] like Figure 1 and Figure 2 As shown, according to the first aspect of an embodiment of the present application, a solid electrolyte preparation device 100 is provided, comprising a first press roller assembly 1, a second press roller assembly 2 and a coating assembly 3; the second press roller assembly 2 is spaced apart from the first press roller assembly 1; the coating assembly 3 is arranged between the first press roller assembly 1 and the second press roller assembly 2, and is located above the first press roller assembly 1 and the second press roller assembly 2 in the vertical direction.

[0044] like Figure 1 As shown, the solid electrolyte preparation device 100 includes a first pressing roller assembly 1, a second pressing roller assembly 2 and a coating assembly 3; wherein, the first pressing roller assembly 1 is used to calender and convey the first membrane a to the second pressing roller assembly 2, and the second pressing roller assembly 2 is used to compound the first powder released by the coating assembly 3 with the first sub-membrane a1 or the first membrane a to form a first composite membrane c, and thin the first composite membrane c.

[0045] To further explain, the first pressing roller assembly 1 and the second pressing roller assembly 2 are arranged at intervals, which can be understood as that there is a certain distance between the first pressing roller assembly 1 and the second pressing roller assembly 2; the coating assembly 3 is arranged between the first pressing roller assembly 1 and the second pressing roller assembly 2, and in the vertical direction, the coating assembly 3 is located above the first pressing roller assembly 1 and the second pressing roller assembly 2; since the first pressing roller assembly 1 will convey the first diaphragm a to the second pressing roller assembly 2, the coating assembly 3 will release the first powder to the side of the first diaphragm a facing the coating assembly 3, and the first powder will be spread on the side of the first diaphragm a facing the coating assembly 3, and the second pressing roller assembly 2 will press the first powder and the first diaphragm a together to form a first composite diaphragm c, and the second pressing roller assembly 2 will thin the first composite diaphragm c.

[0046] Among them, the first powder can be an electrolyte powder. After the first powder is pressed with the first membrane a by the second pressing roller assembly 2, a first composite membrane c including the first membrane a and the second membrane b is formed. The second membrane b is an electrolyte membrane. The first membrane a can be an electrode membrane or a substrate a2, or a composite of an electrode membrane and a substrate a2.

[0047] Therefore, in the solid electrolyte preparation device 100 provided in the present application, the second pressing roller assembly 2 compounds the first diaphragm a and the first powder together to form a first composite diaphragm c and thins it, thereby reducing the possibility of breakage when the first diaphragm a or the second diaphragm b is thinned to a preset thickness separately, thereby improving the quality of the first composite diaphragm c; and compounding the first diaphragm a and the second diaphragm b together to form the first composite diaphragm c can also reduce the number of stacking times, thereby improving production efficiency; and can also improve the alignment of the first composite diaphragm c and improve the alignment accuracy, thereby improving production quality.

[0048] like Figure 1 and Figure 2 As shown, in an optional embodiment, the first pressing roller assembly 1 includes a plurality of first rollers 11, and the plurality of first rollers 11 are arranged at intervals in the horizontal direction; specifically, the plurality of first rollers 11 are used to convey the first film a, and the roller gap spacing between two adjacent first rollers 11 is adjusted as needed, so that the first film a can be thinned.

[0049] It is further explained that the second pressing roller assembly 2 includes a second roller 21 and a third roller 22, and the third roller 22 is spaced apart from the second roller 21 and is located above the second roller 21 in the vertical direction; specifically, the third roller 22 and the second roller 21 are spaced apart, and the third roller 22 is located above the second roller 21 in the vertical direction. A roller gap is formed between the third roller 22 and the second roller 21, and the first diaphragm a and the first powder pass through the roller gap between the third roller 22 and the second roller 21, and the third roller 22 and the second roller 21 press them together to form a first composite diaphragm c; in this embodiment, the third roller 22 is located above the second roller 21 in the vertical direction, that is, the tangent between the third roller 22 and the second roller 21 is parallel to the horizontal axis, and when the first powder and the first diaphragm a pass through the roller gap between the third roller 22 and the second roller 21, the first powder and the first diaphragm a can be pressed together in the horizontal direction to prevent the first powder from slipping off the first diaphragm a.

[0050] The coating assembly 3 is located between the first roller 11 and the second roller 21 .

[0051] like Figure 1 and Figure 2 As shown, in an optional embodiment, the tangent between the first roller 11 and the second roller 21 close to the coating assembly 3 is parallel to the horizontal axis; that is, when the first pressure roller assembly 1 conveys the first film a to the second pressure roller assembly 2, the first film a can be basically parallel to the horizontal axis, thereby preventing the first powder released by the coating assembly 3 onto the first film a from slipping.

[0052] In an optional embodiment, the second pressing roller assembly 2 also includes at least one fourth roller 23, the fourth roller 23 is spaced apart from the second roller 21, and the fourth roller 23 and the third roller 22 are spaced apart along the circumference of the second roller 21; specifically, the second pressing roller assembly 2 may include one fourth roller 23, two fourth rollers 23 or more fourth rollers 23, and multiple fourth rollers 23 and the third roller 22 are spaced apart along the circumference of the second roller 21; the fourth roller 23 is located on the side of the third roller 22 away from the coating assembly 3; wherein a roller gap is formed between the fourth roller 23 and the second roller 21, and the first composite film c will pass through the roller gap between the fourth roller 23 and the second roller 21, and the fourth roller 23 and the second roller 21 can roll-form the first composite film c, and can also thin the first composite film c.

[0053] like Figure 1 and Figure 2 As shown, in an optional embodiment, the diameter of the third roller 22 is smaller than the diameter of the second roller 21, and the diameter of the fourth roller 23 is smaller than the diameter of the second roller 21; in this embodiment, the third roller 22 and the fourth roller 23 can be spaced apart from the second roller 21, and they occupy less space, so that the structure of the preparation setting is more compact.

[0054] In an optional embodiment, the second pressing roller assembly 2 further includes at least one fifth roller 24, and the fifth roller 24 is spaced apart from the second roller 21 in the horizontal direction; specifically, the second pressing roller assembly 2 may include one fifth roller 24, two fifth rollers 24, three fifth rollers 24 or more fifth rollers 24; when the first pressing roller assembly 1 includes one fifth roller 24, the fifth roller 24 is spaced apart from the second roller 21 in the horizontal direction, the first composite film c is conveyed between the second roller 21 and the fifth roller 24 through the fourth roller 23 and the second roller 21, and the second roller 21 and the fifth roller 24 further press the first composite film c and then reel it through the reeling assembly 6; when the second pressing roller assembly 2 includes When there are more than two fifth rollers 24, multiple fifth rollers 24 are arranged at intervals in the horizontal direction, and the fifth roller 24 close to the second roller 21 is arranged at intervals from the second roller 21. The first composite film sheet c is conveyed between the second roller 21 and the fifth roller 24 through the fourth roller 23 and the second roller 21. The second roller 21 and the fifth roller 24 further press the first composite film sheet c. The first composite film sheet c is conveyed between the multiple fifth rollers 24. The multiple fifth rollers 24 can thin the first composite film sheet c and then rewind it through the winding assembly 6. Thinning the first composite film sheet c by multiple fifth rollers 24 can make the first film sheet a or the second film sheet b reach a thinner thickness, and can avoid breakage during thinning.

[0055] The diameter of the fifth roller 24 is the same as the diameter of the second roller 21 .

[0056] like Figure 1 and Figure 2 As shown, in an optional embodiment, the second pressure roller assembly 2 further includes a fourth roller 23 and at least one fifth roller 24, the fourth roller 23 is spaced apart from the second roller 21, the fourth roller 23 and the third roller 22 are spaced apart along the circumference of the second roller 21, and the fifth roller 24 is spaced apart from the second roller 21 in the horizontal direction.

[0057] Specifically, the fourth roller 23 is located on the side of the third roller 22 away from the coating component 3; wherein, a roller gap is formed between the fourth roller 23 and the second roller 21, and the first composite film c will pass through the roller gap between the fourth roller 23 and the second roller 21. The fourth roller 23 and the second roller 21 can roll-form the first composite film c and can also thin the first composite film c; the fifth roller 24 and the second roller 21 are spaced apart in the horizontal direction, and the fourth roller 23 and the fifth roller 24 have no contact relationship.

[0058] like Figure 1 and Figure 2As shown, it is further explained that the line between the center of the third roller 22 and the center of the second roller 21 is the first line A, the line between the center of the fourth roller 23 and the center of the second roller 21 is the second line B, and an angle M is formed between the second line B and the first line A, where M is an acute angle; specifically, the center of the third roller 22 refers to the center of the radial section of the third roller 22, the center of the second roller 21 refers to the center of the radial section of the second roller 21, and the center of the fourth roller 23 refers to the center of the radial section of the fourth roller 23; the line between the center of the third roller 22 and the center of the second roller 21 is the first line A, the line between the center of the fourth roller 23 and the center of the second roller 21 is the second line B, and an angle M is formed between the first line A and the second line B, where M is an acute angle; in this embodiment, the fourth roller 23 is arranged so as to avoid mutual influence with the fifth roller 24.

[0059] like Figure 1 As shown, in an optional embodiment, the solid electrolyte preparation device 100 further includes a blanking component 4, which is located above two adjacent first rollers 11 in the vertical direction; specifically, a blanking area 12 is formed between two adjacent first rollers 11 at one end of the first pressing roller assembly 1 away from the blanking component 4. Since the multiple first rollers 11 are arranged at intervals in the horizontal direction, the blanking area 12 is facing upward in the vertical direction, and the blanking component 4 is located above the blanking area 12 in the vertical direction. The blanking component 4 is used to release the second powder to the blanking area 12, and the two first rollers 11 extrude the second powder located in the blanking area 12 into a first diaphragm a or a first sub-diaphragm a1.

[0060] The second powder may be electrode powder.

[0061] Among them, in an embodiment in which the solid electrolyte preparation device 100 includes a unwinding component 5, the first membrane a includes a first sub-membrane a1 and a substrate a2, the blanking component 4 releases the second powder to the blanking area 12, and the two first rollers 11 extrude the second powder located in the blanking area 12 into the first sub-membrane a1; in an embodiment in which the solid electrolyte preparation device 100 does not include a unwinding component 5, the blanking component 4 releases the second powder to the blanking area 12, and the two first rollers 11 extrude the second powder located in the blanking area 12 into the first membrane a.

[0062] like Figure 2As shown, in an embodiment in which the solid electrolyte preparation device 100 includes a unwinding component 5, the solid electrolyte preparation device 100 also includes an unwinding component 5, which is arranged between two adjacent first rollers 11, and the unwinding component 5 is spaced apart from the blanking component 4; specifically, the unwinding component 5 is spaced apart from the blanking component 4, that is, the substrate a2 released by the unwinding component 5 is conveyed between two adjacent first rollers 11, and the two adjacent first rollers 11 and the two adjacent first rollers 11 forming the blanking area 12 are two different first rollers 11; in this embodiment, the unwinding component 5 releases the substrate a2 and conveys it between two adjacent first rollers 11, and the two adjacent first rollers 11 composite the first sub-membrane a1 and the substrate a2 together to form a first membrane a, which can reduce the number of stacking times, thereby improving production efficiency, and can also prevent the first sub-membrane a1 or the second membrane b from breaking when the first composite membrane c is subsequently thinned.

[0063] According to a second aspect of an embodiment of the present application, a method for preparing a solid electrolyte is provided, which may employ the above-mentioned solid electrolyte preparation device 100. The method comprises:

[0064] S1, the first pressing roller assembly 1 conveys and rolls the first film a to the second pressing roller assembly 2;

[0065] S2, the coating component 3 releases the first powder toward the side of the first membrane a facing the coating component 3;

[0066] S3. The second pressing roller assembly 2 composites the first membrane a with the first powder to form a first composite membrane c including the first membrane a and the second membrane b, and thins the first composite membrane c.

[0067] like Figure 1 and Figure 2 As shown, the first pressing roller assembly 1 is used to calender and convey the first film a to the second pressing roller assembly 2, the coating assembly 3 is located between the first pressing roller assembly 1 and the second pressing roller assembly 2, the coating assembly 3 releases the first powder to the side of the first film a facing the coating assembly 3, and the first powder and the first film a are pressed together by the second pressing roller assembly 2 to form a first composite film c, and the second pressing roller assembly 2 thins the first composite film c.

[0068] In an optional embodiment, the first film a includes a first sub-film a1 and a substrate a2; in S1, the unwinding component 5 releases the substrate a2 to the first pressure roller component 1, and the first pressure roller component 1 composites the first sub-film a1 and the substrate a2 together to form a first film a; specifically, the unwinding component 5 is used to release the substrate a2, and the substrate a2 is conveyed to the first pressure roller component 1, and the first pressure roller component 1 composites the first sub-film a1 and the substrate a2 together to form a first film a; in this embodiment, the number of laminations can be reduced, thereby improving production efficiency.

[0069] like Figure 3 As shown, in an optional embodiment, the first sub-membrane a1 is an electrode membrane, and the second membrane b is an electrolyte membrane; in this embodiment, it is necessary to thin the thickness of the electrolyte membrane. If the electrolyte membrane is thinned alone, the electrolyte membrane will break. Therefore, the first sub-membrane a1, the substrate a2 and the second membrane b are first compounded together to form a first composite membrane c, and then the first composite membrane c is thinned so that the thickness of the second membrane b reaches a preset thickness. Since the electrode membrane and the substrate a2 have a certain thickness, the electrolyte membrane can be prevented from breaking; and the number of stacking times can be reduced, thereby improving production efficiency; and the alignment of the electrode membrane and the electrolyte membrane can be improved, and the alignment accuracy can be improved, thereby improving production quality.

[0070] In an optional embodiment, the substrate a2 is a current collector; in this embodiment, the first sub-membrane a1 is compounded with the current collector, and there is no need to subsequently laminate the first sub-membrane a1 and the second membrane b with the current collector, thereby reducing the process steps and improving work efficiency.

[0071] In another optional embodiment, the substrate a2f is a release film; in this embodiment, the first sub-membrane a1 is compounded with the release film, and subsequently the first sub-membrane a1 and the second membrane b can be compounded with other membranes or foils as needed, and the release film can be peeled off after compounding.

[0072] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A solid electrolyte preparation device, characterized in that: include: a first pressing roller assembly and a second pressing roller assembly, wherein the first pressing roller assembly and the second pressing roller assembly are spaced apart from each other; The coating assembly is arranged between the first pressing roller assembly and the second pressing roller assembly, and is located above the first pressing roller assembly and the second pressing roller assembly in a vertical direction.

2. The solid electrolyte preparation device according to claim 1, characterized in that: The first pressing roller assembly includes a plurality of first rollers, and the plurality of first rollers are arranged at intervals along the horizontal direction; The second pressing roller assembly includes a second roller and a third roller. The third roller is spaced apart from the second roller and is located above the second roller in a vertical direction.

3. The solid electrolyte preparation device according to claim 2, characterized in that: A tangent line between the first roller and the second roller close to the coating assembly is parallel to the horizontal axis.

4. The solid electrolyte preparation device according to claim 2, characterized in that: The second pressing roller assembly further includes at least one fourth roller, wherein the fourth roller is spaced apart from the second roller, and the fourth roller is spaced apart from the third roller along the circumference of the second roller.

5. The solid electrolyte preparation device according to claim 4, characterized in that: The diameter of the third roller is smaller than that of the second roller, and the diameter of the fourth roller is smaller than that of the second roller.

6. The solid electrolyte preparation device according to claim 2, characterized in that: The second pressing roller assembly further includes at least one fifth roller, and the fifth roller is spaced apart from the second roller in the horizontal direction.

7. The solid electrolyte preparation device according to claim 2, characterized in that: The second pressing roller assembly further includes a fourth roller and at least one fifth roller, wherein the fourth roller is spaced apart from the second roller, the fourth roller is spaced apart from the third roller along the circumference of the second roller, and the fifth roller is spaced apart from the second roller along the horizontal direction; The line between the center of the third roller and the center of the second roller is a first line, the line between the center of the fourth roller and the center of the second roller is a second line, and an angle M is formed between the second line and the first line, where M is an acute angle.

8. The solid electrolyte preparation device according to claim 2, characterized in that: The solid electrolyte preparation device further includes a blanking assembly, which is located above two adjacent first rollers in the vertical direction.

9. The solid electrolyte preparation device according to claim 8, characterized in that: The solid electrolyte preparation device further includes an unwinding assembly, which is disposed between two adjacent first rollers, and is spaced apart from the unwinding assembly.

10. A method for preparing a solid electrolyte, characterized in that: The preparation method comprises: S1, the first pressing roller assembly conveys and calenders the first film to the second pressing roller assembly; S2, the coating component releases the first powder toward the side of the first membrane facing the coating component; S3. The second pressing roller assembly composites the first membrane sheet and the first powder material together to form a first composite membrane sheet including the first membrane sheet and the second membrane sheet, and thins the first composite membrane sheet.

11. The preparation method according to claim 10, characterized in that: The first membrane includes a first sub-membrane and a substrate; In S1 , the unwinding assembly releases the substrate to the first pressing roller assembly, and the first pressing roller assembly combines the first sub-film and the substrate to form a first film.

12. The preparation method according to claim 11, characterized in that The first sub-membrane is an electrode membrane, and the second sub-membrane is an electrolyte membrane.

13. The preparation method according to claim 11, characterized in that The substrate is a current collector or a release film.

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