Normal temperature composite device for lithium battery diaphragm production

Abstract

The application discloses a normal-temperature compounding device for lithium battery diaphragm production and relates to the technical field of lithium battery production equipment. The device comprises a rack, a film feeding roller and a constant temperature roller are installed at the film feeding end of the rack, a compounding pressure roller set is installed in the interior of the rack, a dust removal device is installed in the interior of the rack between the constant temperature roller and the compounding pressure roller set, the dust removal device comprises a dust suction box and a dust removal mechanism, the top surface and the bottom surface of the dust suction box are fixedly installed with the dust removal mechanism respectively, an oil groove for storing heat conduction oil is formed in the interior of the constant temperature roller, a heating copper pipe is arranged in the oil groove, and a constant temperature mechanism is rotatably arranged in the oil groove. The device realizes uniform dust removal of the whole area of the compounding surface through the dust removal device structure, avoids the defects of the non-tight compounding of the compounding diaphragm, layering, air bubbles and the like caused by floating dust residues or floating, improves the quality of the lithium battery diaphragm compounding base material, simultaneously realizes convenient replacement of the heat conduction oil in the constant temperature roller, does not need to stop the machine to dismount the constant temperature roller body, simplifies the operation process, reduces the downtime of the production line, and improves the production efficiency.

Description

Technical Field

[0001] This invention relates to the field of lithium battery production equipment technology, and in particular to a room temperature composite device for lithium battery separator production. Background Technology

[0002] In the production process of lithium battery separators, room temperature lamination equipment is commonly used in the lamination process of dry lithium battery separator production lines. It is used to connect the unwinding system and the preheating process. By applying uniform pressure to multiple films, multi-layer lamination is achieved under room temperature conditions, ultimately producing a lithium battery separator composite substrate with mechanical strength, insulation performance, and ion conduction performance. The quality of its lamination directly determines the overall performance of the lithium battery separator, and thus affects key indicators such as the safety and cycle life of the lithium battery. It is the core equipment in the lithium battery separator production process that connects the front-end unwinding and the back-end drying, stretching, and cooling processes.

[0003] However, before laminating the substrate film of lithium battery separator, the commonly used methods are ordinary dust collection or single electrostatic adsorption. The electrostatic field cannot evenly cover the area of ​​the film composite surface, and dust dead spots are easily formed at the edges and corners, leaving floating dust on the composite surface. In addition, there is a lack of floating dust collection and cleaning channels. When the machine is stopped, the floating dust adsorbed by the dust removal mechanism is easily dispersed in the equipment or production workshop due to airflow disturbance, causing secondary pollution. The residual or secondary pollution floating dust is mixed between the film composite surfaces, resulting in defects such as loose bonding, delamination, and bubbles in the composite separator. Furthermore, the replacement of the heat transfer oil in the existing constant temperature roller requires stopping the machine and disassembling the constant temperature roller body, which is a complicated operation process.

[0004] In addition, the constant temperature roller does not have a dedicated constant temperature mechanism in the oil tank. It relies solely on the natural convection mixing of the heat transfer oil, which cannot break the static state of the heat transfer oil. The temperature gradient caused by the local heating of the heating copper tube is difficult to eliminate. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the above and / or existing room temperature composite equipment for lithium battery separator production, the present invention is proposed.

[0007] Therefore, the problem to be solved by the present invention is how to solve the problems of dead corners and secondary pollution in the dust removal of existing lithium battery separator room temperature composite devices, the complicated process of changing the heat transfer oil of the constant temperature roller, and the difficulty in eliminating the temperature gradient in the heat transfer oil in the oil tank due to the lack of active stirring.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a room temperature composite device for lithium battery separator production, comprising a frame, wherein an infeed roller and a constant temperature roller are installed at the infeed end of the frame, a composite pressure roller group is installed inside the frame, a fixed frame is installed at the outlet end of the frame, and an outlet roller is installed on the fixed frame, and a dust removal device is installed inside the frame between the constant temperature roller and the composite pressure roller group, the dust removal device comprising a dust collection box and a dust removal mechanism, wherein the top and bottom openings of the dust collection box are respectively fixedly installed with the dust removal mechanism, an oil tank for storing heat transfer oil is opened inside the constant temperature roller, a heating copper pipe is provided in the oil tank, and a constant temperature mechanism rotates in the oil tank, and the dust removal device supplies air to the oil tank for discharging the heat transfer oil in the oil tank.

[0009] As a preferred embodiment of the ambient temperature composite device for lithium battery separator production according to the present invention, the constant temperature roller includes an outer roller and an inner roller, the oil trough is disposed in the sealed space formed between the inner roller and the outer roller, the side wall of the inner roller is fitted with a rotating cylinder, and the constant temperature mechanism is rotatably connected to the rotating cylinder.

[0010] As a preferred embodiment of the ambient temperature composite device for lithium battery separator production described in this invention, the inner roller has a protrusion integrally formed around its side wall, and the inside of the rotating drum has a groove, with the protrusion and the groove being inserted and installed.

[0011] As a preferred embodiment of the ambient temperature composite device for lithium battery separator production according to the present invention, the constant temperature mechanism includes a rotating ring and connecting plates. The rotating ring is rotatably connected to the side wall of the rotating cylinder. A counterweight is integrally formed at the bottom of the rotating ring. Multiple connecting plates are provided, and the two ends of the multiple connecting plates are circumferentially distributed on the side wall of the rotating ring, and the connecting plates have a corrugated structure.

[0012] In a preferred embodiment of the ambient temperature composite device for lithium battery separator production described in this invention, a pulley is fixedly installed on the side wall of the rotating ring, and the pulley is slidably connected in an annular groove opened on the inner side wall of the outer roller.

[0013] As a preferred embodiment of the ambient temperature composite device for lithium battery separator production according to the present invention, wherein: multiple heating copper tubes are provided, the multiple heating copper tubes are circumferentially mounted on the rotating ring, and both ends of the multiple heating copper tubes are electrically connected to a first power supply line, the first power supply line being rotatably connected to the frame through a conductive slip ring.

[0014] As a preferred embodiment of the ambient temperature composite device for lithium battery separator production according to the present invention, the dust removal mechanism includes a fixed frame, and a plurality of U-shaped partitions are fixedly connected inside the fixed frame. Negative electrode plates and positive electrode plates are fixedly installed on the two side walls of the partitions, respectively. The negative electrode plates and positive electrode plates are powered by second power supply lines on both sides of the fixed frame.

[0015] As a preferred embodiment of the ambient temperature composite device for lithium battery separator production according to the present invention, wherein: a partition is fixed inside the dust collection box, and the inside of the dust collection box is divided into an airflow channel for the dust removal mechanism to enter through the partition. The airflow channel includes multiple branch air slots and a main air slot. The multiple branch air slots are respectively arranged to correspond to the gaps of the negative electrode plate and the positive electrode plate, and the multiple branch air slots are all connected to the main air slot.

[0016] As a preferred embodiment of the ambient temperature composite device for lithium battery separator production according to the present invention, wherein: a dust outlet box is installed on the side wall of the dust collection box; the side wall of the dust outlet box is connected to the air inlet end of the centrifugal fan via a corrugated pipe; the air outlet end of the centrifugal fan is connected to the filter; the air outlet end of the filter is connected to the air inlet end of the air guiding mechanism; the air outlet end of the air guiding mechanism is connected to the first input end of the electromagnetic three-way valve; the output end of the electromagnetic three-way valve is connected to the rotary joint via a connecting pipe; and the rotary joint is sleeved on the two ends of the constant temperature roller.

[0017] As a preferred embodiment of the ambient temperature composite device for lithium battery separator production according to the present invention, the gas guiding mechanism includes a main gas pipe and a gas distribution pipe. The inlet end of the main gas pipe is connected to the outlet end of the filter. The outlet end of the main gas pipe is connected to two gas distribution pipes. The two gas distribution pipes are respectively connected to the first input end of the electromagnetic three-way valve.

[0018] The beneficial effects of this invention are: 1. This invention effectively solves the problems of incomplete dust removal, dead corners, and secondary pollution from floating dust in existing ambient temperature composite devices. Through the structure of the dust removal device, uniform dust removal is achieved across the entire composite surface, while simultaneously achieving efficient collection and cleaning of floating dust. This avoids defects such as loose bonding, delamination, and bubbles in the composite diaphragm caused by residual or scattered floating dust, thus improving the quality of the lithium battery diaphragm composite substrate and ensuring the safety and cycle life of the lithium battery. At the same time, it enables convenient replacement of the heat transfer oil inside the constant temperature roller without stopping the machine to disassemble the constant temperature roller body, simplifying the operation process, reducing production line downtime, and improving production efficiency.

[0019] 2. This invention effectively solves the problem that the heat transfer oil in the existing constant temperature roller oil tank relies solely on natural convection mixing and the temperature gradient is difficult to eliminate. By using a constant temperature mechanism to actively disturb the heat transfer oil, the static state of the heat transfer oil is broken, the uneven temperature caused by local heating of the heating copper tube is eliminated, the surface temperature stability of the constant temperature roller is improved, and a more uniform room temperature pretreatment is provided for the lithium battery separator substrate film. This further improves the performance consistency of the composite separator and ensures the mechanical strength, insulation performance and ion conduction performance of the lithium battery separator. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an overall structural diagram of a room-temperature composite assembly unit for lithium battery separator production.

[0022] Figure 2 This is a diagram showing the guiding structure of a room-temperature composite device for lithium battery separator production.

[0023] Figure 3 This is a structural diagram of the dust removal device and constant temperature roller installation in a room temperature composite unit for lithium battery separator production.

[0024] Figure 4 This is a structural diagram of the dust removal device in a room-temperature composite assembly unit for lithium battery separator production.

[0025] Figure 5 This is a structural diagram of the dust removal mechanism of a room-temperature composite device used in lithium battery separator production.

[0026] Figure 6 This is a diagram showing the internal structure of the dust collection box in a room-temperature composite device for lithium battery separator production.

[0027] Figure 7 This is a structural diagram of the constant temperature roller in a room temperature composite device for lithium battery separator production.

[0028] Figure 8 This is a diagram showing the internal structure of the constant-temperature roller in a room-temperature composite device used for lithium battery separator production.

[0029] Figure 9 Ambient temperature lamination equipment for lithium battery separator production Figure 8 Structural diagram at point A in the middle.

[0030] Figure 10 This is a structural diagram of the temperature control mechanism of a room-temperature composite device for lithium battery separator production.

[0031] In the diagram: 1. Frame; 2. Infeed roller; 3. Temperature-controlled roller; 31. Outer roller; 32. Oil tank; 33. Temperature-controlled mechanism; 331. Rotary ring; 332. Counterweight; 333. Pulley; 334. Connecting plate; 34. Inner roller; 35. Rotary drum; 36. Protrusion; 37. Groove; 38. Heating copper pipe; 39. First power supply line; 4. Dust removal device; 41. Dust collection box; 411. Mounting frame; 412. Dust discharge box; 413. Partition plate one; 414 415. Main air duct; 42. Dust removal mechanism; 421. Fixing frame; 422. Second partition; 423. Negative electrode plate; 424. Positive electrode plate; 425. Second power supply line; 43. Centrifugal fan; 44. Filter; 45. Air guiding mechanism; 451. Main air pipe; 452. Branch air pipe; 46. Solenoid three-way valve; 47. Rotary joint; 5. Tension roller; 6. Composite pressure roller group; 7. Fixing frame; 8. Film exit roller; 9. Waiting area for lamination. Detailed Implementation

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0035] Example 1, referring to Figures 1-6 This is the first embodiment of the present invention. This embodiment provides a room temperature lamination device for lithium battery separator production, including a frame 1. A film inlet roller 2 and a constant temperature roller 3 are installed at the film inlet end of the frame 1. A lamination pressure roller group 6 is installed inside the frame 1. A fixing frame 7 is installed at the film outlet end of the frame 1, and a film outlet roller 8 is installed on the fixing frame 7. Furthermore, in order to ensure that the lithium battery separator maintains tension during lamination, a tension roller 5 is also installed in the frame 1 on one side of the lamination pressure roller group 6. A dust removal device 4 is installed inside the frame 1 between the constant temperature roller 3 and the lamination pressure roller group 6.

[0036] During operation, the substrate film of the lithium battery separator first enters the device from the film inlet end of the frame 1. It first passes through the film inlet roller 2 to ensure that the film is smoothly introduced and that it is in a regular posture without deviation when entering the device. After being introduced, the film passes through the temperature constant roller 3. The temperature constant roller 3 can stably maintain its own surface temperature consistent with the temperature required for room temperature lamination, and perform temperature pretreatment on the incoming film to avoid problems such as shrinkage and wrinkles caused by temperature fluctuations. After the temperature constant pretreatment, the film continues to be conveyed to the lamination pressure roller group 6 inside the frame 1. The lamination pressure roller group 6 applies uniform pressure to the two films to achieve lamination under room temperature conditions. After lamination, the separator is conveyed to the fixed frame 7 at the film outlet end of the frame 1. The composite separator is smoothly exported through the film outlet roller 8 on the fixed frame 7.

[0037] Meanwhile, to prevent the film from stretching, wrinkling, or misalignment during the lamination process due to unstable tension, an additional tension roller 5 is installed on the frame 1 on one side of the lamination roller group 6. The tension roller 5 can sense the tension changes of the film in real time and compensate for the tension fluctuations during the film transport process by fine-tuning its own angle or position, thus maintaining constant tension. In addition, to remove floating dust from the film surface, which can affect the lamination adhesion and cause the diaphragm to delaminate and degrade in performance, the film is pre-treated by the dust removal device 4 to ensure that the lamination surface is clean.

[0038] Specifically, lithium battery separators are made by laminating multiple thin films. The thin films are the substrate of the lithium battery separator. Multiple thin films are laminated at room temperature using this device to form a composite separator with excellent mechanical strength, insulation performance and ion conduction performance. The quality of the lamination directly determines the overall performance of the lithium battery separator, and thus affects key indicators such as the safety and cycle life of the lithium battery. The entire dry-process lithium battery separator production line process is as follows: unwinding system, lamination, preheating, primary drying, longitudinal stretching, secondary drying, cooling and winding. This invention is a room temperature lamination device used in the lithium battery separator lamination process to realize multi-layer lamination of lithium battery separators at room temperature. The area between the constant temperature roller 3 and the lamination pressure roller group 6 is the lamination zone 9 before multiple films are laminated. The dust removal device 4 is set in the lamination zone 9 to remove surface dust from the opposite sides of the multiple films before lamination.

[0039] Specifically, the dust removal device 4 includes a dust collection box 41 and a dust removal mechanism 42. The two sides of the dust collection box 41 are fixedly installed inside the frame 1 by mounting brackets 411. The top and bottom openings of the dust collection box 41 are fixedly installed to the dust removal mechanism 42. The dust removal mechanism 42 includes a fixed frame 421. Multiple U-shaped partitions 422 are fixedly connected inside the fixed frame 421. Negative electrode plates 423 and positive electrode plates 424 are fixedly installed on the two side walls of the partitions 422 respectively. The negative electrode plates 423 and positive electrode plates 424 are powered by the second power supply lines 425 on both sides of the fixed frame 421 respectively.

[0040] In actual operation, the negative electrode plate 423 and positive electrode plate 424 in the dust removal mechanism 42 are stably powered through the second power supply line 425 on both sides of the fixed frame 421. After power supply, a stable electrostatic field is formed between the negative electrode plate 423 and the positive electrode plate 424. Multiple "U"-shaped partitions 422 inside the fixed frame 421 divide the negative electrode plate 423 and the positive electrode plate 424 into multiple independent electrostatic dust removal units, so that the electrostatic field can be evenly distributed in each dust removal unit, ensuring that every area of ​​the thin film composite surface can be covered by the electrostatic field.

[0041] When the film to be laminated passes above or below the dust removal mechanism 42, the floating dust on the film lamination surface will be adsorbed onto the positive electrode plate 424 under the action of electrostatic force of the electrostatic field, thus separating the floating dust from the film. At the same time, the top and bottom openings of the dust collection box 41 are fixedly installed with the dust removal mechanism 42. When the device is stopped and the lithium battery separator is not being laminated, the floating dust adsorbed by the dust removal mechanism 42 can be smoothly sucked into the dust collection box 41 to clean the floating dust adsorbed on the dust removal mechanism 42.

[0042] The dust collection box 41 has a partition 413 fixed inside. The interior of the dust collection box 41 is divided into an airflow channel for the dust removal mechanism 42 to enter through the partition 413. The airflow channel includes multiple branch air slots 414 and a main air slot 415. The multiple branch air slots 414 are respectively arranged to correspond to the gaps of the negative electrode plate 423 and the positive electrode plate 424. The multiple branch air slots 414 are all connected to the main air slot 415.

[0043] The dust collection box 41 has a dust discharge box 412 installed on its side wall. The side wall of the dust discharge box 412 is connected to the air inlet of the centrifugal fan 43 through a corrugated pipe. The corrugated pipe is used to compensate for the installation deviation between the dust discharge box 412 and the centrifugal fan 43, and to avoid airflow leakage caused by insufficient equipment installation accuracy. At the same time, the corrugated pipe has a certain degree of flexibility, which can absorb the vibration generated during equipment operation, reduce the damage of vibration to the connection parts, and ensure the sealing and stability of the dust-laden airflow.

[0044] The outlet of the centrifugal fan 43 is connected to the filter 44. After the centrifugal fan 43 is started, it will generate negative pressure inside the dust collection box 41, causing the airflow to enter the dust collection box 41 through the gap of the dust removal mechanism 42. Since the partition 413 inside the dust collection box 41 divides it into branch air slots 414 and main air slots 415, and multiple branch air slots 414 are respectively set to correspond to the gaps of the negative electrode plate 423 and the positive electrode plate 424, the floating dust adsorbed by the dust removal mechanism 42 will fall from the gaps of the negative electrode plate 423 and the positive electrode plate 424 into the corresponding branch air slots 414 under the action of the negative pressure airflow. The dust-laden airflow in multiple branch air slots 414 will be collected into the main air slot 415 to achieve centralized collection of floating dust.

[0045] The dust-laden airflow in the main air duct 415 passes through the dust outlet box 412 on the side wall of the dust collection box 41, and is then transported to the air inlet of the centrifugal fan 43 via a corrugated pipe. The centrifugal fan 43 provides power to transport the dust-laden airflow to the filter 44. The filter 44 filters the dust-laden airflow, trapping the floating dust inside the filter 44, and the filtered clean airflow is discharged from the filter 44.

[0046] Example 2, refer to Figures 7-9 This is the second embodiment of the present invention. Based on the previous embodiment, the structure of the constant temperature roller 3 has been optimized to further improve its temperature stability and adjustment accuracy, and to adapt to the temperature requirements of room temperature composite of lithium battery separator. The constant temperature roller 3 has an oil trough 32 for storing heat transfer oil inside. The oil trough 32 is provided with a heating copper tube 38. The constant temperature roller 3 includes an outer roller 31 and an inner roller 34. The oil trough 32 is set in the sealed space formed between the inner roller 34 and the outer roller 31. The side wall of the inner roller 34 is fitted with a rotating cylinder 35. The side wall of the inner roller 34 is integrally formed with a protrusion 36. The inside of the rotating cylinder 35 has a groove 37. The protrusion 36 and the groove 37 are inserted and installed. When the constant temperature roller 3 rotates as a whole, the insertion structure of the protrusion 36 and the groove 37 can realize the synchronous rotation of the inner roller 34 and the rotating cylinder 35, and avoid relative sliding between the two.

[0047] It is worth noting that multiple heating copper tubes 38 are provided, and multiple heating copper tubes 38 are circumferentially installed on the rotating ring 331. Both ends of multiple heating copper tubes 38 are electrically connected to the first power supply line 39. The first power supply line 39 is rotatably connected to the frame 1 through a conductive slip ring, which can prevent the power supply line from getting tangled or damaged when the constant temperature roller 3 rotates, and ensure the continuity of power supply.

[0048] The constant temperature roller 3 consists of an outer roller 31 and an inner roller 34, forming a sealed space between them. This sealed space is the oil tank 32 used to store heat transfer oil. As a heat transfer medium, the heat transfer oil can achieve uniform temperature transfer and stable maintenance. Multiple heating copper tubes 38 installed in the oil tank 32 receive a stable power supply through the first power supply line 39. After being powered on, the heating copper tubes 38 generate heat to uniformly heat the heat transfer oil in the oil tank 32, so that the temperature of the heat transfer oil can quickly reach the preset temperature required for room temperature composite and maintain it constant.

[0049] The dust removal device 4 supplies air to the oil tank 32 to discharge the heat transfer oil in the oil tank 32. In addition to the dust removal function of the pre-composite film, the dust removal device 4 also has the functions of supplying air to the oil tank 32 of the constant temperature roller 3 and discharging the heat transfer oil in the oil tank 32. The air outlet of the filter 44 is connected to the air inlet of the air guide mechanism 45. The air outlet of the air guide mechanism 45 is connected to the first input end of the electromagnetic three-way valve 46. The output end of the electromagnetic three-way valve 46 is connected to the rotary joint 47 through the connecting pipe. The rotary joint 47 is sleeved on the two ends of the constant temperature roller 3.

[0050] The air guiding mechanism 45 includes a main air pipe 451 and a branch air pipe 452. The air inlet end of the main air pipe 451 is connected to the air outlet end of the filter 44. The air outlet end of the main air pipe 451 is connected to two branch air pipes 452. The two branch air pipes 452 are respectively connected to the first input end of the electromagnetic three-way valve 46.

[0051] When the device stops, in addition to cleaning the floating dust on the dust removal mechanism 42, the clean airflow filtered by the filter 44 enters the air guiding mechanism 45 through the air inlet. The air guiding mechanism 45 consists of a main air pipe 451 and two branch air pipes 452. The main air pipe 451 divides the clean airflow into two branch air pipes 452, which are respectively connected to the first input end of the electromagnetic three-way valve 46. The electromagnetic three-way valve 46 can switch between air and oil paths according to actual needs. The second input end of the electromagnetic three-way valve 46 is used to introduce and discharge heat transfer oil. When it is necessary to introduce heat transfer oil into the interior of the constant temperature roller 3... The electromagnetic three-way valve 46 connects the second input end with the output end, enabling the heat transfer oil to be introduced into the oil trough 32 of the constant temperature roller 3. When it is necessary to supply air to the oil trough 32 or discharge the heat transfer oil, the electromagnetic three-way valve 46 switches to the first input end, and the clean airflow enters the rotary joint 47 through the connecting pipe. Since the rotary joint 47 is sleeved on the two ends of the constant temperature roller 3, it can ensure stable airflow delivery when the constant temperature roller 3 rotates. The clean airflow enters the oil trough 32 of the constant temperature roller 3 through the rotary joint 47, forming a positive pressure in the oil trough 32. The positive pressure is used to discharge the heat transfer oil in the oil trough 32, realizing the rapid and convenient replacement or discharge of the heat transfer oil.

[0052] Example 3, referring to Figure 10 As shown, this is the third embodiment of the present invention. This embodiment is based on the first two embodiments. A constant temperature mechanism 33 is added to the oil tank 32 to further optimize the temperature uniformity of the heat transfer oil and ensure that the temperature transferred to the outside by the constant temperature roller 3 is more stable. The constant temperature mechanism 33 rotates in the oil tank 32. Specifically, the constant temperature mechanism 33 is rotatably connected to the rotating drum 35. The constant temperature mechanism 33 includes a rotating ring 331 and a connecting plate 334. The rotating ring 331 is rotatably connected to the side wall of the rotating drum 35. A counterweight part 332 is integrally formed at the bottom of the rotating ring 331. Multiple connecting plates 334 are provided. The two ends of the multiple connecting plates 334 are circumferentially distributed on the side wall of the rotating ring 331, and the connecting plates 334 have a corrugated structure.

[0053] Due to the counterweight 332 at the bottom of the rotating ring 331, when the constant temperature roller 3 rotates, it drives the rotating drum 35 to rotate. Under the eccentric gravity of the counterweight 332, the rotating ring 331 rotates with a small amplitude or oscillates back and forth. Meanwhile, the constant temperature roller 3 rotates as a whole. As the rotating ring 331 rotates with the rotating drum 35, it drives multiple corrugated connecting plates 334 to rotate synchronously in the heat transfer oil in the oil tank 32. The corrugated structure can generate a stronger disturbance effect on the heat transfer oil, breaking the static state of the heat transfer oil and allowing the heat transfer oil in different areas of the oil tank 32 to be fully mixed. This avoids uneven temperature of the heat transfer oil caused by local heating of the heating copper tube 38, ensuring that the overall temperature of the heat transfer oil is consistent. As a result, the surface temperature of the outer roller 31 is more uniform, providing a more stable room temperature pretreatment for the lithium battery separator film.

[0054] Furthermore, a pulley 333 is fixedly installed on the side wall of the rotating ring 331. The pulley 333 is slidably connected in the annular groove opened on the inner side wall of the outer roller 31. This is to further improve the stability of the rotation of the constant temperature mechanism 33 and prevent the rotating ring 331 from deviating or jamming during rotation.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A room-temperature composite apparatus for lithium battery separator production, characterized in that: Includes a frame (1), and the infeed end of the frame (1) is equipped with an infeed roller (2) and a constant temperature roller (3). The composite pressure roller assembly (6) is installed inside the frame (1). A fixed frame (7) is installed at the film outlet end of the frame (1), and a film outlet roller (8) is installed on the fixed frame (7). A dust removal device (4) is installed inside the frame (1) between the constant temperature roller (3) and the composite pressure roller group (6). The dust removal device (4) includes a dust collection box (41) and a dust removal mechanism (42). The top and bottom openings of the dust collection box (41) are fixedly installed to the dust removal mechanism (42). The constant temperature roller (3) has an oil tank (32) for storing heat transfer oil inside. The oil tank (32) is equipped with a heating copper tube (38) and a constant temperature mechanism (33) rotates in the oil tank (32). The dust removal mechanism (42) includes a fixed frame (421). A plurality of U-shaped partitions (422) are fixedly connected inside the fixed frame (421). Negative electrode plates (423) and positive electrode plates (424) are fixedly installed on the two side walls of the partitions (422). The negative electrode plates (423) and positive electrode plates (424) are powered by second power supply lines (425) on both sides of the fixed frame (421). The dust collection box (41) is fixed with a partition (413) inside. The interior of the dust collection box (41) is divided into an airflow channel for the dust removal mechanism (42) to enter through the partition (413). The airflow channel includes multiple branch slots (414) and a main slot (415). The multiple branch slots (414) are respectively arranged to correspond to the gaps of the negative electrode plate (423) and the positive electrode plate (424). The multiple branch slots (414) are all connected to the main slot (415). The dust removal device (4) supplies air to the oil tank (32) to discharge the heat transfer oil in the oil tank (32).

2. The ambient temperature composite apparatus for lithium battery separator production as described in claim 1, characterized in that: The constant temperature roller (3) includes an outer roller (31) and an inner roller (34). The oil groove (32) is set in the sealed space formed between the inner roller (34) and the outer roller (31). The inner roller (34) is fitted with a rotating cylinder (35) on its side wall. The constant temperature mechanism (33) is rotatably connected to the rotating cylinder (35).

3. The ambient temperature composite apparatus for lithium battery separator production as described in claim 2, characterized in that: The inner roller (34) has a protrusion (36) integrally formed around its side wall, and the inside of the rotating drum (35) has a groove (37) inserted into it. The protrusion (36) and the groove (37) are connected and installed together.

4. The ambient temperature composite apparatus for lithium battery separator production as described in claim 2, characterized in that: The constant temperature mechanism (33) includes a rotating ring (331) and a connecting plate (334). The rotating ring (331) is rotatably connected to the side wall of the rotating cylinder (35). The bottom of the rotating ring (331) is integrally formed with a counterweight (332). Multiple connecting plates (334) are provided. The two ends of the multiple connecting plates (334) are circumferentially distributed on the side wall of the rotating ring (331), and the connecting plates (334) have a corrugated structure.

5. The ambient temperature composite apparatus for lithium battery separator production as described in claim 4, characterized in that: A pulley (333) is fixedly installed on the side wall of the rotating ring (331), and the pulley (333) is slidably connected in an annular groove opened on the inner side wall of the outer roller (31).

6. The ambient temperature composite apparatus for lithium battery separator production as described in claim 5, characterized in that: Multiple heating copper tubes (38) are provided. Multiple heating copper tubes (38) are fixedly installed around a ring (331). Both ends of multiple heating copper tubes (38) are electrically connected to a first power supply line (39). The first power supply line (39) is rotatably connected to the frame (1) through a conductive slip ring.

7. The ambient temperature composite apparatus for lithium battery separator production as described in claim 1, characterized in that: The dust collection box (41) has a dust outlet box (412) installed on its side wall. The side wall of the dust outlet box (412) is connected to the air inlet of the centrifugal fan (43) through a corrugated pipe. The air outlet of the centrifugal fan (43) is connected to the filter (44). The air outlet of the filter (44) is connected to the air inlet of the air guide mechanism (45). The air outlet of the air guide mechanism (45) is connected to the first input end of the electromagnetic three-way valve (46). The output end of the electromagnetic three-way valve (46) is connected to the rotary joint (47) through a connecting pipe. The rotary joint (47) is sleeved on the two ends of the constant temperature roller (3).

8. The ambient temperature composite apparatus for lithium battery separator production as described in claim 7, characterized in that: The air guiding mechanism (45) includes a main air pipe (451) and a branch air pipe (452). The air inlet end of the main air pipe (451) is connected to the air outlet end of the filter (44). The air outlet end of the main air pipe (451) is connected to two branch air pipes (452). The two branch air pipes (452) are respectively connected to the first input end of the electromagnetic three-way valve (46).

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