Dry-method composite electrode preparation device for battery

Abstract

The utility model discloses a battery dry method composite electrode preparation device which is sequentially provided with an unwinding mechanism, a front guide fixed roller set, a front tension control roller set, a cold pressing double-roller set, a hot pressing composite double-roller set, a rear guide roller, a rear tension roller and a winding mechanism in the first direction. The composite pole piece enters the cold pressing roller set through the front guide fixed roller set and the front tension control roller set and then enters the hot pressing composite roller set to form the composite pole piece, and the composite pole piece enters the winding mechanism to be wound through the rear guide roller and the rear tension roller. In this way, normal and stable operation of the whole continuous rolling process is guaranteed by adjusting the speed of the unwinding mechanism, the speed of the cold pressing double-roller set, the speed of the hot pressing composite double-roller set and the speed of the winding mechanism in cooperation with the tension control roller set. Thus, one-time continuous production can be achieved, the high-compaction composite pole piece obtained through a one-step method is beneficial to reducing interface impedance, the prepared composite pole piece can greatly simplify the subsequent lamination procedure, and mass production can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a device for preparing a dry composite electrode for batteries. Background Technology

[0002] With the development of lithium-ion batteries, all-solid-state batteries have been extensively studied. Existing lithium-ion battery electrode preparation processes can be categorized into dry and wet methods based on whether solvents are used. Wet methods are more common. First, solid powders are mixed in a specific ratio, then thoroughly stirred in water or an organic solvent to form a slurry. This slurry is then coated onto a current collector and dried to form the electrode. After drying, the electrode is compacted. However, the wet process generates numerous pores during the liquid draining process, resulting in significant interfacial resistance even with subsequent rolling. Furthermore, the solvents used in wet processes are often environmentally polluting and harmful to human health. Dry processes, on the other hand, provide electrodes with higher compaction density, significantly reducing interfacial resistance. Currently, research on continuous production of dry-processed electrodes is still in its early stages in the lithium battery industry. There are few devices related to dry film formation for lithium-ion battery electrodes. Existing dry film formation devices suffer from drawbacks such as complex structures, high battery interfacial resistance, equipment redundancy, and operational inconvenience. Moreover, they cannot form uniform films after premixing, and continuous winding after film formation is impossible, leading to significant difficulties in mass production of electrodes. Utility Model Content

[0003] To address the technical problems existing in the background art, this utility model proposes a battery dry composite electrode preparation device.

[0004] The present invention proposes a battery dry composite electrode preparation device, which includes, in sequence along a first direction, an unwinding mechanism, a front guide roller group, a front tension control roller group, a cold pressing roller group 27, a hot pressing composite roller group 28, a rear guide roller 29, a rear tension roller 30, and a winding mechanism 32. Each material film layer is unwound by the unwinding mechanism, passes through the front guide roller group and the front tension control roller group, enters the cold pressing roller group 27, and then enters the hot pressing composite roller group 28 to form a composite electrode sheet 33. The composite electrode sheet 33 then passes through the rear guide roller 29 and the rear tension roller 30 and enters the winding mechanism 32 for winding.

[0005] High-pressure composite electrodes can be produced continuously in one step, which helps to reduce interfacial impedance. The composite electrodes prepared can greatly simplify the subsequent stacking process and achieve mass production.

[0006] Preferably, the unwinding mechanism is provided in sequence along the direction opposite to the first direction: current collector unwinding roller 1, first positive electrode film unwinding roller 2, second positive electrode film unwinding roller 3, first solid electrolyte unwinding roller 4, and second solid electrolyte unwinding roller 5. The front guide roller group is provided in sequence along the vertical direction: first solid electrolyte front guide roller 11, first positive electrode film front guide roller 12, current collector front guide roller 13, second positive electrode film front guide roller 14, and second solid electrolyte front guide roller 15. The current collector unwinding roller 1 and the current collector front guide roller 13 are on the same height plane so that the current collector 6 is in the center position, the first positive electrode film 7 and the second positive electrode film 8 are respectively located on both sides of the current collector 6, the first solid electrolyte film 9 is located outside the first positive electrode film 7, and the second solid electrolyte film 10 is located outside the second positive electrode film 8.

[0007] Preferably, the front tension control roller group is provided with the following components arranged sequentially in the vertical direction: a first solid electrolyte front tension control roller 16, a first positive electrode film front tension control roller 17, a current collector front tension control roller 18, a second positive electrode film front tension control roller 19, and a second solid electrolyte front tension control roller 20. The height of the first solid electrolyte front tension control roller 16 is located between the first solid electrolyte front guide roller 11 and the first positive electrode film front guide roller 12. Each film layer enters from the upper end of the front guide roller group and then extends from the lower end of the front tension control roller group.

[0008] Preferably, a front electrode alignment roller group and a flat pressing roller group 26 are further provided sequentially between the front tension control roller group and the cold pressing roller group 27. The front electrode alignment roller group is used for correcting and aligning the film layers and is provided sequentially and at intervals along the vertical direction as follows: a first solid electrolyte front electrode alignment roller 21, a first positive electrode film front electrode alignment roller 22, a current collector front electrode alignment roller 23, a second positive electrode film front electrode alignment roller 24, and a second solid electrolyte front electrode alignment roller 25. The height of the first solid electrolyte front electrode alignment roller 21 is higher than that of the first... The solid electrolyte front tension control roller 16 is lower than the first solid electrolyte front guide roller 11. The flat pressure roller group 26 includes two flat pressure rollers arranged vertically and vertically. The cold pressure roller group 27 includes two cold pressure rollers arranged vertically and vertically. The hot pressure composite roller group 28 includes two hot pressure rollers arranged vertically and vertically. Each film layer extending from the lower end of the front tension control roller group enters between the two flat pressure rollers, exits between the two flat pressure rollers and enters between the two cold pressure rollers, exits between the two cold pressure rollers and then enters between the two hot pressure rollers.

[0009] Preferably, the upper end of the rear guide roller 29 is at the same height as the outlet height of the hot-pressed composite roller group 28, and the composite electrode 33 that comes out from between the two hot-pressed rollers enters the upper end of the rear guide roller 29.

[0010] Preferably, the height of the rear tension roller 30 is lower than that of the rear guide roller 29, and the composite electrode 33 exits from the upper end of the rear guide roller 29 and enters the lower end of the rear tension roller 30.

[0011] Preferably, a rear electrode take-up and correction roller 31 is further provided between the rear tension roller 30 and the take-up mechanism 32. The height of the rear electrode take-up and correction roller 31 is higher than that of the rear tension roller 30 and lower than that of the rear guide roller 29. The composite electrode 33 that comes out from the lower end of the rear tension roller 30 enters the upper end of the rear electrode take-up and correction roller 31 and then enters the take-up mechanism 32 from the upper end.

[0012] Preferably, each of the front tension rollers and the rear tension roller 30 of the front tension control roller group is equipped with a pressure sensor for detecting the tension magnitude.

[0013] The tension can be adjusted according to the pressure.

[0014] Preferably, it further includes a control mechanism, wherein the pressure sensor is electrically connected to the control mechanism, and the control mechanism includes a hydraulic control group and a heating control group for adjusting the roll gap, pressure and temperature.

[0015] In summary, this invention offers the following advantages: Each film layer undergoes constant-speed hot roll forming via an unwinding mechanism, a front guide roller group, a front tension control roller group, a cold pressing roller group, a hot pressing composite roller group, a rear guide roller, a rear tension roller, and a winding mechanism to form a high-pressure compact composite electrode. Adjusting the speeds of the unwinding mechanism, the cold pressing roller group, the hot pressing composite roller group, and the winding mechanism, in conjunction with the tension control roller group, ensures the normal and stable operation of the entire continuous roll forming process. This allows for continuous production in a single step. The high-pressure compact composite electrode obtained through this one-step method helps reduce interfacial impedance, and the resulting composite electrode greatly simplifies subsequent lamination processes, enabling mass production.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the battery dry composite electrode preparation device according to an embodiment of the present invention.

[0018] In the picture:

[0019] 1. Current collector unwinding roller; 2. First positive electrode film unwinding roller; 3. Second positive electrode film unwinding roller; 4. First solid electrolyte unwinding roller; 5. Second solid electrolyte unwinding roller; 6. Current collector; 7. First positive electrode film; 8. Second positive electrode film; 9. First solid electrolyte film; 10. Second solid electrolyte film; 11. First solid electrolyte front guide roller; 12. First positive electrode film front guide roller; 13. Current collector front guide roller; 14. Second positive electrode film front guide roller; 15. Second solid electrolyte front guide roller; 16. First solid electrolyte front tension control roller; 17. First positive electrode film front tension control roller. 18. Current collector front tension control roller; 19. Second positive electrode film front tension control roller; 20. Second solid electrolyte front tension control roller; 21. First solid electrolyte front electrode sheet correction roller; 22. First positive electrode film front electrode sheet correction roller; 23. Current collector front electrode sheet correction roller; 24. Second positive electrode film front electrode sheet correction roller; 25. Second solid electrolyte front electrode sheet correction roller; 26. Flat pressing roller group; 27. Cold pressing roller group; 28. Hot pressing composite roller group; 29. ​​Rear guide roller; 30. Rear tension roller; 31. Rear electrode sheet winding correction roller; 32. Winding mechanism; 33. Composite electrode sheet. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] like Figure 1 As shown, the battery dry composite electrode preparation device proposed in this embodiment includes, in sequence along the first direction: an unwinding mechanism, a front guide roller group, a front tension control roller group, a cold pressing roller group 27, a hot pressing composite roller group 28, a rear guide roller 29, a rear tension roller 30, and a winding mechanism 32. Each film layer material is unwound through the unwinding mechanism, passes through the front guide roller group and the front tension control roller group, enters the cold pressing roller group 27, and then enters the hot pressing composite roller group 28 to form a composite electrode sheet 33. The composite electrode sheet 33 then passes through the rear guide roller 29 and the rear tension roller 30 and enters the winding mechanism 32 for winding.

[0022] In this way, the various material film layers are subjected to constant-speed hot roll forming through the unwinding mechanism, the front guide roller group, the front tension control roller group, the cold pressing roller group 27, the hot pressing composite roller group 28, the rear guide roller 29, the rear tension roller 30, and the winding mechanism 32 to form a high-pressure compact composite electrode sheet 33. By adjusting the speeds of the unwinding mechanism, the cold pressing roller group 27, the hot pressing composite roller group 28, and the winding mechanism 32, in conjunction with the tension control roller group, the normal and stable operation of the entire continuous roll forming process is ensured. In this way, continuous production can be achieved in one step. The high-pressure compact composite electrode sheet obtained in one step is beneficial to reducing interfacial impedance. The prepared composite electrode sheet can greatly simplify the subsequent stacking process and achieve mass production.

[0023] Furthermore, the unwinding mechanism is provided in sequence along the direction opposite to the first direction: current collector unwinding roller 1, first positive electrode film unwinding roller 2, second positive electrode film unwinding roller 3, first solid electrolyte unwinding roller 4, and second solid electrolyte unwinding roller 5. The front guide roller group is provided in sequence along the vertical direction: first solid electrolyte front guide roller 11, first positive electrode film front guide roller 12, current collector front guide roller 13, second positive electrode film front guide roller 14, and second solid electrolyte front guide roller 15. The current collector unwinding roller 1 and the current collector front guide roller 13 are on the same height plane so that the current collector 6 is in the center position. The first positive electrode film 7 and the second positive electrode film 8 are located on both sides of the current collector 6, the first solid electrolyte film 9 is located outside the first positive electrode film 7, and the second solid electrolyte film 10 is located outside the second positive electrode film 8.

[0024] The electrode sheets released by the unwinding mechanism are symmetrical, wherein the current collector 6 released by the current collector unwinding roller 1 is located at the center position, the first positive electrode film 7 released by the first positive electrode film unwinding roller 2 and the second positive electrode film 8 released by the second positive electrode film unwinding roller 3 are located on both sides of the current collector 6, and the first solid electrolyte film 9 released by the first solid electrolyte unwinding roller 4 and the second solid electrolyte film 10 released by the second solid electrolyte unwinding roller 5 are located on both sides of the positive electrode film, outside the first positive electrode film 7 and outside the second positive electrode film 8.

[0025] Furthermore, the front tension control roller group is provided with the following components arranged sequentially in the vertical direction: a first solid electrolyte front tension control roller 16, a first positive electrode film front tension control roller 17, a current collector front tension control roller 18, a second positive electrode film front tension control roller 19, and a second solid electrolyte front tension control roller 20. The height of the first solid electrolyte front tension control roller 16 is located between the first solid electrolyte front guide roller 11 and the first positive electrode film front guide roller 12. Each film layer enters from the upper end of the front guide roller group and then extends from the lower end of the front tension control roller group.

[0026] Specifically, each front tension roller in the front tension control roller group is equipped with a pressure sensor to detect the tension magnitude, and the tension can be adjusted according to the pressure magnitude.

[0027] In this embodiment, a front electrode correction roller group and a flat pressing roller group 26 are also provided sequentially between the front tension control roller group and the cold pressing roller group 27. The front electrode correction roller group is used to correct and align the film layers and is provided sequentially and at intervals along the vertical direction as follows: a first solid electrolyte front electrode correction roller 21, a first positive electrode film front electrode correction roller 22, a current collector front electrode correction roller 23, a second positive electrode film front electrode correction roller 24, and a second solid electrolyte front electrode correction roller 25. The height of the first solid electrolyte front electrode correction roller 21 is higher than that of the first solid electrolyte front tension control roller 25. 6. Below the first solid electrolyte front guide roller 11, the flat pressure roller group 26 includes two flat pressure rollers arranged vertically (the gap between the two flat pressure rollers is adjustable to complete the initial bonding of the five sets of electrode sheets), the cold pressure roller group 27 includes two cold pressure rollers arranged vertically (the roller gap and pressure between the two cold pressure rollers are adjustable), and the hot pressure composite roller group 28 includes two hot pressure rollers arranged vertically (the roller gap, pressure, and temperature between the two hot pressure rollers are adjustable; specific adjustment methods can be found in existing technologies and will not be repeated here). It should be noted that the temperature control range of the hot rollers in this embodiment is 0~220℃, which can complete the bonding of the electrolyte membrane, positive electrode membrane, and current collector. Each membrane layer extending from the lower end of the front tension control roller group enters between the two flat pressure rollers, exits between the two flat pressure rollers, enters between the two cold pressure rollers, exits between the two cold pressure rollers, and then enters between the two hot pressure rollers.

[0028] It should be noted that each correction roller in the front electrode correction roller group can correct and align the electrode film.

[0029] The upper end of the rear guide roller 29 is level with the exit height of the hot-pressing composite roller assembly 28. The composite electrode 33, which comes out from between the two hot-pressing rollers, enters the upper end of the rear guide roller 29. The height of the rear tension roller 30 is lower than that of the rear guide roller 29. The composite electrode 33 comes out from the upper end of the rear guide roller 29 and enters the lower end of the rear tension roller 30.

[0030] Preferably, a rear electrode winding correction roller 31 is also provided between the rear tension roller 30 and the winding mechanism 32. The height of the rear electrode winding correction roller 31 is higher than that of the rear tension roller 30 and lower than that of the rear guide roller 29. The composite electrode 33 that comes out from the lower end of the rear tension roller 30 enters the upper end of the rear electrode winding correction roller 31 and then enters the winding mechanism 32 from the upper end.

[0031] Specifically, the back tension roller 30 is equipped with a pressure sensor for detecting the tension.

[0032] In a preferred embodiment, a control mechanism is also included. The pressure sensor is electrically connected to the control mechanism, which includes a hydraulic control group and a heating control group to regulate the roll gap, pressure, and temperature.

[0033] In summary, the first positive electrode film 7 is sequentially passed through the first positive electrode film unwinding roller 2, the first positive electrode film front guide roller 12, the first positive electrode film front tension control roller 17, the first positive electrode film front electrode sheet correction roller 22, the flat pressure roller group 26, the cold pressure roller group 27, the hot pressure roller group 28, the rear guide roller 29, the rear tension roller 30, and the rear electrode sheet winding correction roller 31, and then connected to the winding mechanism 32.

[0034] The roll of the first solid electrolyte membrane 9 is sequentially passed through the first solid electrolyte unwinding roller 4, the first solid electrolyte front guide roller 11, the first solid electrolyte front tension control roller 16, the first solid electrolyte front electrode correction roller 21, the flat pressure roller group 26, the cold pressure roller group 27, the hot pressure roller group 28, the rear guide roller 29, the rear tension roller 30, and the rear electrode winding correction roller 31, and then connected to the winding mechanism 32.

[0035] The current collector 6 is sequentially passed through the current collector unwinding roller 1, the current collector front guide roller 13, the current collector front tension control roller 18, the current collector front electrode correction roller 23, the flat pressure roller group 26, the cold pressure roller group 27, the hot pressure roller group 28, the rear guide roller 29, the rear tension roller 30, and the rear electrode winding correction roller 31, and connected to the winding mechanism 32. After passing through the flat pressure roller group 26, the current collector 6 is located on the first positive electrode film 7.

[0036] The obtained second solid electrolyte membrane 10 roll is sequentially passed through the second solid electrolyte unwinding roller 5, the second solid electrolyte front guide roller 15, the second solid electrolyte front tension roller 20, the second solid electrolyte front electrode correction roller 25, the flat pressure roller group 26, the cold pressure roller group 27, the hot pressure roller group 28, the rear guide roller 29, the rear tension roller 30, and the rear electrode winding correction roller 31, and connected to the winding mechanism 32.

[0037] The obtained second positive electrode film 8 roll is sequentially passed through the second positive electrode film unwinding roller 3, the second positive electrode film front guide roller 14, the second positive electrode film front tension control roller 19, the second positive electrode film front electrode sheet correction roller 24, the flat pressure roller group 26, the cold pressure roller group 27, the hot pressure roller group 28, the rear guide roller 29, the rear tension roller 30, and the rear electrode sheet winding correction roller 31, and connected to the winding mechanism 32. After passing through the flat pressure roller group 26, the current collector 6 is located on the second positive electrode film 8.

[0038] By rationally adjusting the unwinding speed, winding speed, roller speed, and tension through the control mechanism, the polar roll can run at a constant speed.

[0039] The driving flat pressure rollers, cold pressure rollers, and hot pressure rollers complete the composite of the electrode sheets, resulting in a dense composite electrode sheet with a smooth surface. The obtained composite electrode roll is collected by the rear tension roller 30, the rear electrode sheet winding and correction roller 31, and the winding mechanism 32 to achieve mass production.

[0040] Specifically, the driving device can be a cylinder, or other propulsion and retraction devices capable of linear motion; this embodiment does not impose any specific limitations on this.

[0041] In this way, continuous production can be achieved. High-pressure composite electrodes obtained in one step are beneficial to reducing interfacial impedance, and the prepared composite electrodes can greatly simplify the subsequent stacking process.

[0042] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A device for preparing a battery dry composite electrode, characterized in that, The following components are arranged sequentially along the first direction: unwinding mechanism, front guide roller group, front tension control roller group, cold pressing roller group (27), hot pressing composite roller group (28), rear guide roller (29), rear tension roller (30) and winding mechanism (32). Each material film layer is unwound by the unwinding mechanism, passes through the front guide roller group and the front tension control roller group to enter the cold pressing roller group (27), and then enters the hot pressing composite roller group (28) to form a composite electrode sheet (33). The composite electrode sheet (33) then passes through the rear guide roller (29) and the rear tension roller (30) and enters the winding mechanism (32) for winding.

2. The battery dry-process composite electrode preparation apparatus according to claim 1, characterized in that, The unwinding mechanism is provided in sequence along the direction opposite to the first direction: current collector unwinding roller (1), first positive electrode film unwinding roller (2), second positive electrode film unwinding roller (3), first solid electrolyte unwinding roller (4) and second solid electrolyte unwinding roller (5). The front guide roller group is provided in sequence along the vertical direction: first solid electrolyte front guide roller (11), first positive electrode film front guide roller (12), current collector front guide roller (13), second positive electrode film front guide roller (14) and second solid electrolyte front guide roller (15). The current collector unwinding roller (1) and the current collector front guide roller (13) are on the same height plane so that the current collector (6) is in the center position, the first positive electrode film (7) and the second positive electrode film (8) are respectively located on both sides of the current collector (6), the first solid electrolyte film (9) is located outside the first positive electrode film (7), and the second solid electrolyte film (10) is located outside the second positive electrode film (8).

3. The battery dry-process composite electrode preparation apparatus according to claim 2, characterized in that, The front tension control roller group is arranged sequentially and at intervals along the vertical direction as follows: a first solid electrolyte front tension control roller (16), a first positive electrode film front tension control roller (17), a current collector front tension control roller (18), a second positive electrode film front tension control roller (19), and a second solid electrolyte front tension control roller (20). The height of the first solid electrolyte front tension control roller (16) is located between the first solid electrolyte front guide roller (11) and the first positive electrode film front guide roller (12). Each film layer enters from the upper end of the front guide roller group and then extends from the lower end of the front tension control roller group.

4. The battery dry-process composite electrode preparation apparatus according to claim 3, characterized in that, Between the front tension control roller group and the cold pressing roller group (27), a front electrode correction roller group and a flat pressing roller group (26) are also provided in sequence. The front electrode correction roller group is used to correct and align the film layers and is provided in sequence along the vertical direction as follows: a first solid electrolyte front electrode correction roller (21), a first positive electrode film front electrode correction roller (22), a current collector front electrode correction roller (23), a second positive electrode film front electrode correction roller (24), and a second solid electrolyte front electrode correction roller (25). The height of the first solid electrolyte front electrode correction roller (21) is higher than that of the first solid electrolyte front electrode correction roller (25). A solid electrolyte front tension control roller (16) is lower than the first solid electrolyte front guide roller (11). The flat pressure roller group (26) includes two flat pressure rollers arranged vertically and vertically. The cold pressure roller group (27) includes two cold pressure rollers arranged vertically and vertically. The hot pressure composite roller group (28) includes two hot pressure rollers arranged vertically and vertically. Each film layer extending from the lower end of the front tension control roller group enters between the two flat pressure rollers, exits between the two flat pressure rollers and enters between the two cold pressure rollers, exits between the two cold pressure rollers and then enters between the two hot pressure rollers.

5. The battery dry-process composite electrode preparation apparatus according to claim 4, characterized in that, The upper end of the rear guide roller (29) is level with the exit height of the hot-pressed composite roller group (28), and the composite electrode (33) coming out from between the two hot-pressed rollers enters the upper end of the rear guide roller (29).

6. The battery dry-process composite electrode preparation apparatus according to claim 5, characterized in that, The height of the rear tension roller (30) is lower than that of the rear guide roller (29), and the composite electrode (33) comes out from the upper end of the rear guide roller (29) and enters the lower end of the rear tension roller (30).

7. The battery dry-process composite electrode preparation apparatus according to claim 6, characterized in that, A rear electrode winding correction roller (31) is also provided between the rear tension roller (30) and the winding mechanism (32). The height of the rear electrode winding correction roller (31) is higher than that of the rear tension roller (30) and lower than that of the rear guide roller (29). The composite electrode (33) that comes out from the lower end of the rear tension roller (30) enters the upper end of the rear electrode winding correction roller (31) and then enters the winding mechanism (32) from the upper end.

8. The battery dry-process composite electrode preparation apparatus according to claim 7, characterized in that, Each of the front tension rollers and the rear tension roller (30) of the front tension control roller group is equipped with a pressure sensor for detecting the tension magnitude.

9. The battery dry-process composite electrode preparation apparatus according to claim 8, characterized in that, It also includes a control mechanism, the pressure sensor being electrically connected to the control mechanism, the control mechanism comprising a hydraulic control group and a heating control group, for adjusting the roll gap, pressure, and temperature.

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