Hot roller pressing roller assembly and thermal compounding device

Abstract

The utility model relates to the technical field of lithium ion battery pole piece manufacturing, and discloses a hot roller pressing roller assembly and a hot compounding device, the hot roller pressing roller assembly comprises a hot pressing roller, the hot pressing roller comprises an upper pressing roller and a lower pressing roller, a first gap is arranged between the upper pressing roller and the lower pressing roller, the upper pressing roller and / or the lower pressing roller comprises a roller main body part and a groove part, the diameter of the groove part is smaller than that of the roller main body part, the battery pole piece passes through the first gap, the solid electrolyte membrane is arranged on the surface of one side, facing the battery pole piece, of the diaphragm, the diaphragm passes through the first gap, and the hot pressing roller is used for compounding the solid electrolyte membrane on the battery pole piece. According to the hot rolling roller assembly, the groove part corresponds to the empty foil surface, so that when a battery pole piece and a diaphragm pass through the first gap, the empty foil surface is prevented from being rolled by the upper pressing roller and the lower pressing roller, the empty foil surface passing through the hot rolling roller assembly can be kept flat, the roller main body part corresponds to the coating surface, and the first gap is matched with the rolling compounding pressure; the composite forming quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion battery pole piece manufacturing, in particular to a hot roller pressing roller assembly and a hot composite device. Background Art

[0002] At present, new energy vehicles have high performance requirements for lithium-ion batteries. The power lithium-ion batteries used are mostly in the form of stacked sheets, but stacked lithium-ion batteries can no longer meet the large-scale demand of new energy vehicles. Therefore, multi-electrode or full-electrode structure lithium-ion batteries have been developed. Because they have both the performance characteristics of stacked sheets and the advantages of high-efficiency winding, they have quickly been recognized by the industry. In order to improve the efficiency of coating this structure, zebra coating is usually used. The pole piece of this structure is coated with multiple coatings on a long strip to form multiple coating surfaces. The coating surfaces are spaced apart from each other, and the middle is an empty foil surface without coating. Since the coating surface is generally black and the empty foil surface is generally silver-white, zebra stripes are formed.

[0003] The existing device for thermally compounding the zebra coated pole piece with the solid electrolyte after rolling, due to the large difference in tension and strength between the bare foil surface and the coating surface of the zebra coating, if the pressure is applied during rolling, the bare foil surface of the zebra coating will be seriously wrinkled; if the pressure is reduced during rolling (the pressure is adjusted to a small value), the coating surface and the solid electrolyte will not be well compounded, and the composite molding quality is low, which affects mass production. Therefore, it is urgent to design a new hot rolling roller assembly and a thermal compounding device to improve the above problems. Utility Model Content

[0004] The utility model aims to provide a hot roller pressing roller assembly and a hot composite device, which solve the technical problems that the tension and strength of the space foil surface and the coating surface are greatly different during the hot pressing composite of the pole piece and the solid electrolyte, the space foil surface is prone to wrinkles when pressurized, and the coating surface is prone to poor composite when decompressed.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A hot roller pressure roller assembly, comprising a hot pressure roller, wherein the hot pressure roller comprises an upper pressure roller and a lower pressure roller, wherein the upper pressure roller and the lower pressure roller are arranged up and down, and a first gap is formed between the upper pressure roller and the lower pressure roller;

[0007] The upper pressing roller and / or the lower pressing roller comprises a roller body and a groove portion, the diameter of the groove portion is smaller than the diameter of the roller body, the battery pole piece passes through the first gap, the solid electrolyte membrane is arranged on the side surface of the diaphragm facing the battery pole piece, the diaphragm passes through the first gap, and the hot pressing roller is used to composite the solid electrolyte membrane on the battery pole piece.

[0008] As a preferred solution of the hot roller pressure roller assembly, the width of the groove portion along the axial direction thereof is 20 μm to 80 μm.

[0009] As a preferred solution of the hot roller pressure roller assembly, the difference between the diameter of the groove portion and the diameter of the roller body portion is less than 200 μm.

[0010] As a preferred solution of the hot roller pressure roller assembly, the upper pressure roller and / or the lower pressure roller can be detachably connected to the frame.

[0011] As a preferred solution of the hot roller pressure roller assembly, the upper pressure roller is a hot steel roller;

[0012] The lower pressing roller is a hot rubber coated roller.

[0013] As a preferred solution of the hot roller pressure roller assembly, the number of the groove parts is one or more, and the plurality of groove parts are arranged at intervals between two adjacent sections of the roller main body parts.

[0014] A thermal composite device, comprising a frame and an electrode tape unwinding roller, a first diaphragm unwinding roller, a second diaphragm unwinding roller, the above-mentioned hot roller pressing roller assembly, a first diaphragm winding roller, a second diaphragm winding roller and an electrode tape winding roller arranged on the frame;

[0015] The pole piece tape is wound around the pole piece tape unwinding roller, the pole piece tape unwinding roller unwinds the pole piece tape along a first direction, and the first diaphragm unwinding roller and the first diaphragm winding roller are symmetrically arranged with the first diaphragm unwinding roller and the second diaphragm winding roller along the first direction;

[0016] The first diaphragm is wound around the circumference of the first diaphragm unwinding roller, the first diaphragm is located above the pole piece belt, and the first diaphragm is superimposed on the upper surface of the pole piece belt;

[0017] The second diaphragm is wound around the circumference of the second diaphragm unwinding roller, the second diaphragm is located below the pole piece belt, and the second diaphragm is stacked on the lower surface of the pole piece belt;

[0018] The first diaphragm winding roller winds up the diaphragm of the first diaphragm, the second diaphragm winding roller winds up the diaphragm of the second diaphragm, and the electrode tape winding roller winds up the electrode tape along the first direction.

[0019] As a preferred solution of the thermal composite device, the thermal composite device further comprises a preheating roller assembly, which is located at the front end of the hot roller pressure roller assembly and comprises:

[0020] a first preheated steel roll; and

[0021] The second preheating steel roller is arranged above and below the first preheating steel roller and is located below the first preheating steel roller. There is a second gap between the first preheating steel roller and the second preheating steel roller, and the second gap is larger than the first gap. The first diaphragm is in contact with the circumferential side of the first preheating steel roller, and the second diaphragm is in contact with the second preheating steel roller.

[0022] As a preferred solution of the thermal composite device, the thermal composite device further comprises a cooling roller assembly, which is located at the rear end of the hot roller pressure roller assembly and comprises:

[0023] a first cooling steel roll; and

[0024] The second cooling steel roller is arranged above and below the first cooling steel roller and is located below the first cooling steel roller. There is a third gap between the first cooling steel roller and the second cooling steel roller. The third gap is larger than the first gap. The diaphragm of the first diaphragm is in contact with the circumferential side of the first cooling steel roller, and the diaphragm of the second diaphragm is in contact with the second cooling steel roller.

[0025] As a preferred embodiment of the thermal composite device, the thermal composite device also includes a plurality of traction rollers, each of which is arranged in a one-to-one correspondence with the first diaphragm unwinding roller, the second diaphragm unwinding roller, the first diaphragm winding roller and the second diaphragm winding roller, and is used to adjust the unwinding or winding angle.

[0026] Beneficial effects of the utility model:

[0027] The utility model provides a hot roller pressing roller assembly, which arranges an upper pressing roller and / or a lower pressing roller in the form of a roller main body and a groove part, and the diameter of the groove part is smaller than the diameter of the roller main body, and the groove part corresponds to the empty foil surface, so that when the battery pole piece and the diaphragm pass through the first gap, the upper pressing roller and the lower pressing roller are avoided from rolling the empty foil surface, ensuring that the empty foil surface passing through the hot roller pressing roller assembly can be kept flat, the roller main body corresponds to the coating surface, the first gap is matched with the pressure of the rolling composite, and the composite molding quality is improved to ensure mass production.

[0028] The utility model provides a thermal composite device, which uses the above-mentioned hot roller pressure roller assembly to perform hot pressing composite of the pole piece strip and the solid electrolyte membrane, ensuring that the empty foil surface can remain flat, the coating surface and the solid electrolyte composite pressure are matched, and the composite molding quality is improved to ensure mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the thermal composite device provided in the embodiment of the utility model;

[0030] Figure 2It is a front view of the hot pressing roller assembly provided by an embodiment of the utility model.

[0031] In the figure:

[0032] 1. Electrode strip unwinding roller; 2. First diaphragm unwinding roller; 3. Second diaphragm unwinding roller; 4. Upper pressure roller; 5. Lower pressure roller; 51. Roller body; 52. Groove portion; 6. First diaphragm winding roller; 7. Second diaphragm winding roller; 8. Preheating roller assembly; 81. First preheating steel roller; 82. Second preheating steel roller; 9. Cooling roller assembly; 91. First cooling steel roller; 92. Second cooling steel roller; 10. Electrode strip winding roller; 11. Pulling roller. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] Combination Figure 1 As shown, this embodiment provides a thermal composite device, which includes a frame (not shown in the figure) and an electrode strip unwinding roller 1, a first diaphragm unwinding roller 2, a second diaphragm unwinding roller 3, a hot roller pressure roller assembly, a first diaphragm winding roller 6, a second diaphragm winding roller 7 and an electrode strip winding roller 10 rotatably arranged on the frame.

[0038] It should be noted that the electrode tape is wound around the electrode tape unwinding roller 1. After the electrode tape passes through the hot rolling assembly in the first direction, the upper and lower surfaces of the electrode tape are respectively hot-pressed and compounded with solid electrolyte membranes to form an electrode tape. The electrode tape is wound on the electrode tape winding roller 10 by the rotation of the electrode tape winding roller 10. The first diaphragm unwinding roller 2 is wound around the first diaphragm, and the second diaphragm unwinding roller 3 is wound around the second diaphragm. The solid electrolyte membrane is arranged on the diaphragm to form the above-mentioned first diaphragm and second diaphragm. The solid electrolyte membrane of the first diaphragm is superimposed on the upper surface of the electrode tape, and the solid electrolyte membrane of the second diaphragm is superimposed on the lower surface of the electrode tape. After the solid electrolyte membrane is compounded on the electrode tape, the diaphragm of the first diaphragm is rolled up by the first diaphragm winding roller 6, and the diaphragm of the second diaphragm is rolled up by the second diaphragm winding roller 7.

[0039] The first diaphragm is located above the pole piece belt, the second diaphragm is located below the pole piece belt, and the first diaphragm unwinding roller 2 and the first diaphragm winding roller 6 are symmetrically arranged along the first direction and the first diaphragm unwinding roller 3 and the second diaphragm winding roller 7 are symmetrically arranged along the vertical direction.

[0040] Furthermore, in order to better composite the solid electrolyte membrane on the electrode strip, such as Figure 1As shown, the hot composite device also includes a preheating roller assembly 8, which is located at the front end of the hot roller pressure roller assembly and includes a first preheating steel roller 81 and a second preheating steel roller 82. The second preheating steel roller 82 is arranged above and below the first preheating steel roller 81 and is located below the first preheating steel roller 81. There is a second gap between the first preheating steel roller 81 and the second preheating steel roller 82, and the second gap is larger than the first gap, so as not to affect the transmission of the pole piece belt. The first diaphragm is in contact with the peripheral side of the first preheating steel roller 81, and the second diaphragm is in contact with the second preheating steel roller 82. By adding the preheating roller assembly 8, the first diaphragm and the second diaphragm are preheated before entering the hot roller pressure roller assembly, which is beneficial to the subsequent hot pressing composite and facilitates the separation of the solid electrolyte membrane and the diaphragm.

[0041] Furthermore, in order to enable the heated diaphragm to be directly rolled up, such as Figure 1 As shown, the hot composite device also includes a cooling roller assembly 9, which is located at the rear end of the hot roller pressure roller assembly and includes a first cooling steel roller 91 and a second cooling steel roller 92. The second cooling steel roller 92 is arranged above and below the first cooling steel roller 91 and is located below the first cooling steel roller 91. There is a third gap between the first cooling steel roller 91 and the second cooling steel roller 92, and the third gap is larger than the first gap, so as not to affect the transmission of the electrode belt. The diaphragm of the first diaphragm fits the circumferential side of the first cooling steel roller 91, and the diaphragm of the second diaphragm fits the second cooling steel roller 92. By adding the cooling roller assembly 9, the diaphragm separated from the solid electrolyte membrane after hot pressing composite can be quickly cooled and shaped, so that the temperature of the diaphragm can be directly wound, and there will be no deformation between the layers after winding, which is conducive to secondary use.

[0042] Preferably, continue to participate Figure 1 The thermal composite device also includes a plurality of traction rollers 11. Four traction rollers are provided in this embodiment. Each traction roller 11 is provided in one-to-one correspondence with the first membrane unwinding roller 2, the second membrane unwinding roller 3, the first membrane winding roller 6 and the second membrane winding roller 7. The traction roller 11 is provided away from the electrode belt or the electrode belt relative to each unwinding roller or winding roller, and is used to adjust the unwinding or winding angle. Specifically, taking the first membrane unwinding roller 2 and the first membrane winding roller 6 as an example, the two traction rollers 11 corresponding to the first membrane unwinding roller 2 and the first membrane winding roller 6 are provided away from the electrode belt relative to the first membrane unwinding roller 2 and the first membrane winding roller 6, respectively. The first membrane unwinding roller 2 unwinds the first membrane. The first membrane is wound around the traction roller 11 from top to bottom, and then wound around the first preheating steel roller 81 from bottom to top, so as to pull the first membrane and keep it in close contact with the first preheating steel roller 81.

[0043] In the existing device for thermally compounding the zebra-coated electrode sheet with the solid electrolyte after roller pressing, due to the large difference in tension and strength between the empty foil surface and the coated surface of the zebra coating, if pressure is applied during roller pressing, the empty foil surface of the zebra coating will be seriously wrinkled; if the pressure is reduced during roller pressing (the pressure is adjusted to a small value), the coating surface and the solid electrolyte will not be well compounded, and the composite molding quality is low, which affects mass production.

[0044] In order to solve the above problems, combined Figure 1 and Figure 2 As shown, this embodiment also provides a hot roller pressure roller assembly, which includes an upper pressure roller 4 and a lower pressure roller 5, which are arranged up and down, and there is a first gap between the upper pressure roller 4 and the lower pressure roller 5, and the upper pressure roller 4 and / or the lower pressure roller 5 include a roller body 51 and a groove part 52, and the diameter of the groove part 52 is smaller than the diameter of the roller body 51, and the battery pole piece passes through the first gap, and the solid electrolyte membrane is arranged on the side surface of the diaphragm facing the battery pole piece, and the diaphragm passes through the first gap, and the hot roller is used to composite the solid electrolyte membrane on the battery pole piece.

[0045] It can be understood that by configuring the upper pressing roller 4 and / or the lower pressing roller 5 to be in the form of a roller body 51 and a groove 52, and the diameter of the groove 52 is smaller than the diameter of the roller body 51, and the groove 52 corresponds to the empty foil surface, the upper pressing roller 4 and the lower pressing roller 5 are avoided from rolling the empty foil surface when the battery electrode and the diaphragm pass through the first gap, ensuring that the empty foil surface passing through the hot roller assembly can remain flat, the roller body 51 corresponds to the coating surface, the first gap matches the pressure of the rolling composite, and the composite molding quality is improved to ensure mass production.

[0046] Preferably, the lower pressing roller 5 of this embodiment includes a roller body 51 and a groove 52, the upper pressing roller 4 is a common cylindrical roller, the roller body 51 is provided with two sections, the groove 52 is provided between the two sections of the roller body 51, and the groove 52 and the roller body 51 are coaxially arranged. Of course, the number of sections of the roller body 51 and the number of the grooves 52 can be adaptively adjusted according to actual conditions, and this embodiment does not specifically limit this.

[0047] In other embodiments, the upper pressing roller 4 includes a roller body portion 51 and a groove portion 52 , and the upper pressing roller 4 is a common cylindrical roller.

[0048] In another embodiment, the upper pressing roller 4 and the lower pressing roller 5 both include a roller body portion 51 and a groove portion 52 .

[0049] Specifically, Figure 2As shown, the width of the groove portion 52 along its axial direction is 20μm to 80μm, 30μm in this embodiment, and can be 20μm, 40μm, 50μm, 60μm, 70 or 80μm in other embodiments. The width of the groove portion 52 can be set according to actual conditions, and this embodiment does not make any specific limitation.

[0050] In addition, if Figure 2 As shown, the difference between the diameter of the groove portion 52 and the diameter of the roller body is less than 200μm, which is 150μm in this embodiment, and can be 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 160μm, 170μm, 180μm or 190μm, etc. in other embodiments. The difference between the two can be set according to actual conditions, and this embodiment does not make any specific limitation.

[0051] Among them, the upper pressing roller 4 and / or the lower pressing roller 5 are detachably connected to the frame, and the bearing of the lower pressing roller 5 of this embodiment is detachably connected to the frame by bolts, so that the gap between the upper pressing roller 4 and the lower pressing roller 5 can also be adjusted by the installation position of the bolts, so that the pressure of the hot pressing composite can be adaptively adjusted according to the needs, and the versatility is good. Of course, it can also be adjusted according to the size of the empty foil surface and the coating surface, or the lower pressing roller 5 of different specifications can be replaced.

[0052] In addition, the number of the groove portions 52 is one or more. In this embodiment, one groove portion is provided, and in other embodiments, multiple groove portions 52 are arranged at intervals between two adjacent sections of the roller main body portions 51. The specific number is set as needed, and this embodiment does not make any specific limitation on this.

[0053] Preferably, the upper pressing roller 4 of this embodiment is a hot steel roller, and the lower pressing roller 5 is a hot rubber-coated roller.

[0054] It should be noted that, in this embodiment, solid electrolyte membranes are provided on both sides of the pole piece belt as an example. In other embodiments, if the pole piece belt is provided on only one side, it is only necessary to selectively provide the first diaphragm unwinding roller 2, the first preheating steel roller 81, the first cooling steel roller 91 and the first diaphragm winding roller 6 located above the pole piece belt, or the second diaphragm unwinding roller 3, the second preheating steel roller 82, the second cooling steel roller 92 and the second diaphragm winding roller 7 located below the pole piece belt.

[0055] In summary, the hot composite device uses a hot roller assembly to perform hot pressing composite of the electrode strip and the solid electrolyte membrane, ensuring that the empty foil surface can remain flat, the coating surface matches the solid electrolyte composite pressure, and the composite molding quality is improved to ensure mass production.

[0056] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. The hot roller pressure roller assembly is characterized in that: It comprises a hot pressing roller, wherein the hot pressing roller comprises an upper pressing roller (4) and a lower pressing roller (5), wherein the upper pressing roller (4) and the lower pressing roller (5) are arranged up and down, and a first gap is formed between the upper pressing roller (4) and the lower pressing roller (5); The upper pressing roller (4) and / or the lower pressing roller (5) comprises a roller body (51) and a groove portion (52), the diameter of the groove portion (52) is smaller than the diameter of the roller body (51), the battery electrode sheet passes through the first gap, the solid electrolyte membrane is arranged on a side surface of the diaphragm facing the battery electrode sheet, the diaphragm passes through the first gap, and the hot pressing roller is used to composite the solid electrolyte membrane on the battery electrode sheet.

2. The hot roller pressure roller assembly according to claim 1, characterized in that: The width of the groove portion (52) along its axial direction is 20 μm to 80 μm.

3. The hot roller pressure roller assembly according to claim 1, characterized in that: The difference between the diameter of the groove portion (52) and the diameter of the roller body portion (51) is less than 200 μm.

4. The hot roller pressure roller assembly according to claim 1, characterized in that: The upper pressing roller (4) and / or the lower pressing roller (5) are detachably connected to the frame.

5. The hot roller pressure roller assembly according to claim 1, characterized in that: The upper pressure roller (4) is a hot steel roller; The lower pressure roller (5) is a heat-coated rubber roller.

6. The hot roller pressure roller assembly according to any one of claims 1 to 5, characterized in that: The number of the groove portions (52) is one or more, and the plurality of groove portions (52) are arranged at intervals between two adjacent sections of the roller main body portions (51).

7. A thermal composite device, characterized in that: It comprises a frame and an electrode tape unwinding roller (1), a first diaphragm unwinding roller (2), a second diaphragm unwinding roller (3), a hot roller pressing roller assembly according to any one of claims 1 to 6, a first diaphragm winding roller (6), a second diaphragm winding roller (7) and an electrode tape winding roller (10) arranged on the frame; The pole piece tape is wound around the pole piece tape unwinding roller (1), the pole piece tape unwinding roller (1) unwinds the pole piece tape along a first direction, and the first diaphragm unwinding roller (2) and the first diaphragm winding roller (6) are symmetrically arranged along the first direction with the second diaphragm unwinding roller (3) and the second diaphragm winding roller (7); The first diaphragm is wound around the circumference of the first diaphragm unwinding roller (2), the first diaphragm is located above the pole piece belt, and the first diaphragm is superimposed on the upper surface of the pole piece belt; The second diaphragm is wound around the circumference of the second diaphragm unwinding roller (3), the second diaphragm is located below the pole piece belt, and the second diaphragm is superimposed on the lower surface of the pole piece belt; The first diaphragm winding roller (6) winds up the diaphragm of the first diaphragm, the second diaphragm winding roller (7) winds up the diaphragm of the second diaphragm, and the electrode tape winding roller (10) winds up the electrode tape along the first direction.

8. The thermal composite device according to claim 7, characterized in that: The thermal compounding device further comprises a preheating roller assembly (8), which is located at the front end of the hot roller pressure roller assembly and comprises: a first preheated steel roll (81); and The second preheating steel roller (82) is arranged above and below the first preheating steel roller (81) and is located below the first preheating steel roller (81). A second gap exists between the first preheating steel roller (81) and the second preheating steel roller (82), and the second gap is larger than the first gap. The first diaphragm is in contact with the circumferential side of the first preheating steel roller (81), and the second diaphragm is in contact with the second preheating steel roller (82).

9. The thermal composite device according to claim 8, characterized in that: The thermal composite device further comprises a cooling roller assembly (9), which is located at the rear end of the hot roller pressure roller assembly and comprises: a first cooling steel roll (91); and The second cooling steel roller (92) is arranged above and below the first cooling steel roller (91) and is located below the first cooling steel roller (91). There is a third gap between the first cooling steel roller (91) and the second cooling steel roller (92). The third gap is larger than the first gap. The diaphragm of the first diaphragm is in contact with the circumferential side of the first cooling steel roller (91), and the diaphragm of the second diaphragm is in contact with the second cooling steel roller (92).

10. The thermal composite device according to claim 9, characterized in that: The thermal composite device also includes a plurality of pulling rollers (11), each of the pulling rollers (11) being arranged in one-to-one correspondence with the first diaphragm unwinding roller (2), the second diaphragm unwinding roller (3), the first diaphragm winding roller (6) and the second diaphragm winding roller (7), for adjusting the unwinding or winding angle.

Images