Push-pull type heating structure and lithium battery diaphragm extraction tank

Abstract

The utility model relates to a push-pull type heating structure and a lithium battery diaphragm extraction tank, and belongs to the technical field of lithium battery diaphragm manufacturing equipment. The push-pull type heating structure comprises a frame, the frame is provided with a flow dividing pipe and a flow collecting pipe which are arranged in parallel at intervals in the horizontal direction, the side walls of the flow dividing pipe and the flow collecting pipe are provided with a plurality of liquid conveying connectors in the axial direction, the flow dividing pipe is provided with a medium inlet, and the flow collecting pipe is provided with a medium outlet; the slide way assemblies are arranged on the frame, each slide way assembly is provided with at least one heating plate arranged in the axial direction of the flow dividing pipe, a snakelike circulating flow channel is formed in each heating plate, and the input end of each snakelike circulating flow channel is connected with the liquid conveying connector of the flow dividing pipe through a first quick connecting assembly; the output end is connected with the infusion connector of the collecting pipe through a second quick connection assembly. The scheme provided by the utility model has the advantages of convenience in maintenance, uniformity in heating, reliability in connection and accuracy in temperature control.

Description

Technical Field

[0001] This application relates to the field of lithium battery separator manufacturing equipment technology, and in particular to a push-pull heating structure and a lithium battery separator extraction tank. Background Technology

[0002] In the wet process of lithium-ion battery separators, a heating structure is required inside the extraction tank to maintain the process temperature. Traditional heating methods utilize an array of heating tubes fixed inside the extraction tank. This fixed heating structure presents significant maintenance challenges. When cleaning and maintenance of the extraction tank are required, operators must enter the narrow tank interior, resulting in limited working space and the need to disassemble the entire heating system. This increases safety risks and leads to low maintenance efficiency. Utility Model Content

[0003] To overcome the problems existing in related technologies, this application provides a push-pull heating structure and a lithium battery separator extraction tank, which has the advantages of convenient maintenance, uniform heating, reliable connection and precise temperature control.

[0004] The first aspect of this application provides a push-pull heating structure, comprising:

[0005] The frame has a shunt tube and a manifold arranged parallel to each other in the horizontal direction. The sidewalls of the shunt tube and the manifold are provided with multiple infusion ports along the axial direction. The shunt tube is provided with a medium inlet and the manifold is provided with a medium outlet.

[0006] At least two sets of slide assemblies are mounted on the frame. Each set of slide assemblies is provided with at least one heating plate arranged along the axial direction of the diversion pipe. The heating plate is provided with a serpentine circulation channel. The input end of the serpentine circulation channel is connected to the infusion interface of the diversion pipe through a first quick-connect assembly, and the output end is connected to the infusion interface of the manifold through a second quick-connect assembly.

[0007] In some embodiments, the heating plate includes two plate covers and multiple sets of parallel corrugated plates. The corrugated plates are sandwiched between the two plate covers and are connected to the plate covers by brazing. A serpentine flow channel is formed between the corrugated plates, and adjacent serpentine flow channels are connected end to end to form the serpentine circulation channel.

[0008] In some embodiments, the wave crest height of the wave plate is 2-5 mm, the wave pitch is 10-20 mm, and adjacent wave plates are staggered and superimposed to form a honeycomb turbulent structure.

[0009] In some embodiments, the medium flowing within the serpentine circulation channel is water.

[0010] In some embodiments, the slide assembly includes a lower slide rail located at the top of the diverter pipe and an upper slide rail located at the bottom of the manifold pipe, and the bottom of the heating plate is provided with a roller assembly.

[0011] In some embodiments, both the first quick-connect assembly and the second quick-connect assembly include a flange interface, a metal bellows, and a quick-connect fitting. The flange interface is welded to the infusion interface, the metal bellows is connected to the flange interface, the female fitting of the quick-connect fitting is connected to the metal bellows, and the input and output ends of the serpentine circulation channel are both provided with male fittings of the quick-connect fitting.

[0012] In some embodiments, the heating plate is made of aluminum alloy or copper alloy.

[0013] In some embodiments, temperature sensors are spaced apart on the branch pipe and the manifold, and a turbine flow meter and an electric regulating valve are provided at the medium inlet. The turbine flow meter, the electric regulating valve and the temperature sensors form a closed-loop temperature control system through a PID controller.

[0014] A second aspect of this application is to provide a lithium battery separator extraction tank, including the aforementioned push-pull heating structure.

[0015] As can be seen from the above, the push-pull heating structure and lithium battery separator extraction tank provided in this application realize convenient push-pull maintenance of the heating plate through the design of the slide assembly and quick-connect assembly, improve the heating uniformity by adopting the honeycomb turbulent structure formed by the corrugated plate, and realize precise temperature control with the closed-loop temperature control system. It has the advantages of convenient maintenance, uniform heating, reliable connection and precise temperature control. Attached Figure Description

[0016] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0017] Figure 1 This is a schematic diagram of a heating structure in the prior art;

[0018] Figure 2 This is a schematic diagram of the push-pull heating structure shown in the embodiments of this application;

[0019] Figure 3 yes Figure 2 A structural schematic diagram of the enlarged view at point A in the middle;

[0020] Figure 4 This is a side view of the push-pull heating structure shown in the embodiments of this application;

[0021] Figure 5This is a diagram showing the open state of the push-pull heating structure as illustrated in the embodiments of this application;

[0022] Figure 6 This is a schematic diagram of the structure of the heating plate shown in an embodiment of this application.

[0023] Figure label:

[0024] 1. Diverter pipe; 2. Manifold pipe; 3. Infusion interface; 4. Medium inlet; 5. Medium outlet; 6. Slide assembly; 7. Heating plate; 70. Plate cover; 71. Corrugated plate; 8. First quick-connect assembly; 80. Flange interface; 81. Metal bellows; 82. Quick-connect fitting; 9. Second quick-connect assembly; 10. Roller assembly. Detailed Implementation

[0025] Preferred embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0026] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0027] The present invention provides a push-pull heating structure, including a frame, having a diversion pipe 1 and a manifold 2 arranged parallel to each other in the horizontal direction, the sidewalls of the diversion pipe 1 and the manifold 2 being provided with a plurality of infusion ports 3 along the axial direction, the diversion pipe 1 being provided with a medium inlet 4, and the manifold 2 being provided with a medium outlet 5.

[0028] At least two sets of slide assemblies 6 are mounted on the frame. Each set of slide assemblies 6 is provided with at least one heating plate 7 arranged along the axial direction of the diversion pipe 1. The heating plate 7 is provided with a serpentine circulation channel. The input end of the serpentine circulation channel is connected to the infusion interface 3 of the diversion pipe 1 through a first quick-connect assembly 8, and the output end is connected to the infusion interface 3 of the manifold 2 through a second quick-connect assembly 9.

[0029] Specifically, the frame is installed in the middle of the extraction tank, dividing it into two extraction units. The frame consists of a branch pipe 1 and a manifold 2, which can be made of stainless steel square tubing with a diameter between 50 and 150 mm. The infusion ports 3 can be standard threaded interfaces or flange interfaces 80, the number of which is determined by the number of heating plates 7. The input end of the heating plate 7 is connected to the branch pipe 1 via a first quick-connect assembly 8, and the output end of the heating plate 7 is connected to the manifold 2 via a second quick-connect assembly 9, thus establishing a loop for media flow. Simultaneously, the first quick-connect assembly 8 and the second quick-connect assembly 9 can also fix and limit the heating plates 7, thereby maintaining their deployed state. Furthermore, the media inlet 4 of the branch pipe 1 is connected to an external hot media circulation system via a flange, and the media outlet 5 of the manifold 2 is connected to a return water pipeline, which is also connected to the external hot media circulation system. The return water temperature is adjusted in real time by a PID controller. The slide rail assembly 6 can be a linear guide rail or a roller slide rail structure. Specifically, a stainless steel guide rail can be used in conjunction with a polytetrafluoroethylene slider to achieve smooth movement, or a polytetrafluoroethylene roller can be used to achieve smooth movement.

[0030] The slide rail assembly 6 forms an assembly space for mounting the heating plate 7. The number of slide rail assemblies 6 matches the number of heating plates 7. For example, when there are 2 heating plates 7, there are two sets of slide rail assemblies 6; when there are 3 to 4 heating plates 7, the number of slide rail assemblies 6 can be set to two or three sets; when there are 5 to 6 heating plates 7, the number of slide rail assemblies 6 is as follows: Figure 2 The setup shown is three groups. The dimensions of the heating plate 7 can be designed according to actual needs, with typical dimensions of 600–1200 mm × 1800–2400 mm × 25–35 mm. The flow direction of the internal serpentine circulation channel is from bottom to top. The first quick-connect assembly 8 and the second quick-connect assembly 9 can adopt a compression fitting type quick-change connector or a rotary locking type quick-change connector. The length of the metal bellows 81 can be set to 100–200 mm to compensate for installation errors.

[0031] In this embodiment, the heating plate 7 is designed as a push-pull movable structure, and smooth movement is achieved through the slide assembly 6. The first quick-connect assembly 8 and the second quick-connect assembly 9 ensure the reliability of the fluid pipeline connection. The parallel arrangement of the branch pipe 1 and the manifold 2 ensures uniform medium distribution. Multiple sets of heating plates 7 can be independently disassembled and installed, facilitating local maintenance. When combined, they can free up space for personnel to stand and operate, improving maintenance convenience and safety.

[0032] Furthermore, the heating plate 7 includes two plate covers 70 and multiple sets of parallel corrugated plates 71. The corrugated plates 71 are sandwiched between the two plate covers 70, and the corrugated plates 71 are connected to the plate covers 70 by brazing. A serpentine flow channel is formed between the corrugated plates 71, and adjacent serpentine flow channels are connected end to end to form a serpentine circulation channel.

[0033] The corrugated plate 71 is formed by stamping a thin metal sheet, and its cross-section has a continuous wavy structure. The cover plate 70 is a flat metal plate, which is sealed to the corrugated plate 71 by brazing. In a preferred embodiment, both the corrugated plate 71 and the cover plate can be made of stainless steel, aluminum alloy, or copper alloy, with a thickness controlled within the range of 0.3–0.8 mm. During brazing, the solder is heated to its melting point and fills the gap between the cover plate 70 and the corrugated plate 71 through capillary action. After cooling, a permanent seal is formed. The continuous wavy structure of the corrugated plate 71 increases the structural strength of the heating plate 7 and the connection strength with the cover plate 70. The crests and troughs of adjacent corrugated plates 71 interlock, thus forming a... Figure 6 The continuous fluid channel shown has a cover 70 with two flow channel holes. The two flow channel holes are respectively connected to the two ends of the serpentine circulation channel. The male connector of the quick-connect connector 82 is welded to the two flow channel holes. The male connector of the quick-connect connector 82 and the female connector of the quick-connect connector 82 can be locked together by a snap fastener.

[0034] In this embodiment, the serpentine circulation channel is efficiently formed through the brazing structure of the corrugated plates 71 and the cover plate 70. The parallel arrangement of the corrugated plates 71 ensures uniform channel distribution, and the brazing connection guarantees channel sealing. Compared to traditional fluid pipes, this structure has a larger heat exchange area. Furthermore, by adjusting the wave pitch and wave height parameters of the corrugated plates 71, the channel cross-sectional area and fluid resistance can be flexibly controlled, thereby adapting to heat exchange requirements under different operating conditions.

[0035] Furthermore, the crest height of the aforementioned corrugated plates 71 is 2–5 mm, and the wave pitch is 10–20 mm. Adjacent corrugated plates 71 are staggered and stacked to form a honeycomb-like turbulent flow structure. The crest height of the corrugated plates 71 is controlled within the range of 2–5 mm through a precision stamping process, and the wave pitch is processed to 10–20 mm using CNC bending equipment. During assembly, adjacent corrugated plates 71 are staggered and stacked with a phase difference of 180 degrees, so that the crests and troughs interlock to form a regular honeycomb-like arrangement. When the heat medium flows through, the honeycomb-like arrangement of the corrugated plates 71 forces the fluid to generate multi-directional turbulence, disrupting boundary layer formation and ensuring full contact between the medium and the heat transfer surface. Compared to traditional smooth flow channels, this structure increases the heat transfer coefficient by more than 40% while keeping the flow resistance within a reasonable range. This design is particularly suitable for extraction processes that require precise temperature control, effectively solving the problems of local overheating or uneven heat transfer present in traditional heating structures, without requiring additional power consumption. As a preferred implementation, a parameter combination of 3mm crest height and 15mm wave pitch can be used, which yields the best turbulence effect. The thickness of the metal sheet is preferably 0.5–1.2mm, which ensures both structural strength and ease of forming.

[0036] Furthermore, the medium flowing within the aforementioned serpentine circulation channel is water.

[0037] Furthermore, the aforementioned slide assembly 6 includes a lower slide rail located at the top of the diverter pipe 1 and an upper slide rail located at the bottom of the manifold pipe 2. Roller assemblies 10 are provided at the bottom of the heating plate 7. The lower slide rail is fixedly connected to the diverter pipe 1 by bolts, and the upper slide rail is connected to the manifold pipe 2 by welding. The roller assembly 10 consists of four polyvinylidene fluoropolymer (PVDF) rollers with deep groove ball bearings, arranged in a rectangular pattern at the four corners of the heating plate 7. In a preferred embodiment, the slide rail is made of 304 stainless steel with an inverted U-shaped cross-section and an inner PTFE wear-resistant liner. The clearance between the roller assembly 10 and the slide rail is controlled within the range of 0.5–1 mm, thereby allowing the heating plate 7 to slide freely along the slide rail axis in the horizontal plane while restricting vertical displacement.

[0038] Furthermore, the aforementioned quick-connect assembly includes a flange interface 80, a metal bellows 81, and a quick-connect fitting 82. The flange interface 80 is welded to the infusion interface 3, the metal bellows 81 is connected to the flange interface 80, the female fitting of the quick-connect fitting 82 is connected to the metal bellows 81, and the input and output ends of the serpentine circulation channel are both provided with male fittings of the quick-connect fitting 82.

[0039] Specifically, the flange interface 80 is made of stainless steel and is sealed to the infusion interface 3 via argon arc welding. The end face of the flange interface 80 is machined with an annular sealing groove and equipped with a fluororubber sealing ring. The metal bellows 81 is made of 316L stainless steel, with 8 to 12 corrugations and a single corrugation compensation of not less than 5 mm, which can effectively absorb pipeline installation deviations and thermal expansion and contraction displacements. The quick-connect fitting 82 adopts an ISO standard three-lobed ferrule structure. The male fitting has a guide cone surface at the front end and is equipped with a double O-ring of fluororubber. The female fitting has a spring-loaded ferrule locking mechanism inside, and quick connection and separation are achieved by rotating the outer sleeve. As a preferred embodiment, the metal bellows 81 and the flange interface 80 are connected by a flange and equipped with an anti-loosening gasket. The female fitting of the quick-connect fitting 82 is connected to the metal bellows 81 by a thread and thread sealant is applied.

[0040] Furthermore, temperature sensors are spaced apart on the above-mentioned branch pipe 1 and manifold 2, and a turbine flow meter and an electric regulating valve are provided at the medium inlet 4. The turbine flow meter, the electric regulating valve and the temperature sensors form a closed-loop temperature control system through a PID controller.

[0041] Specifically, the temperature sensor uses a PT100 platinum resistance temperature probe, which is fixed to the temperature measuring holes on the outer walls of the branch pipe 1 and the manifold 2 via a threaded connection. Temperature measuring points are arranged in groups every 300mm along the axial direction. The turbine flow meter is connected to the medium inlet 4 pipe via a flange. The electric regulating valve is a linear stroke single-seat regulating valve with a 316L stainless steel body and an equal percentage flow characteristic. The PID controller uses an intelligent temperature controller with RS485 communication capability, connected to the host computer via the MODBUS protocol. The temperature sensor detects the medium temperature in real time and feeds it back to the PID controller. The controller controls the medium flow by adjusting the opening of the electric regulating valve based on the deviation between the set temperature value and the measured value, thereby achieving a temperature control accuracy of ±0.5℃.

[0042] In this embodiment, the present invention achieves precise temperature control of the heating structure through closed-loop control. A temperature sensor monitors changes in the medium temperature, a turbine flow meter detects flow data, and an electric regulating valve executes flow regulation commands. These three components form a closed-loop control circuit using a PID algorithm. Compared to open-loop control, this scheme can automatically compensate for temperature deviations caused by ambient temperature fluctuations, heating load changes, and other factors, ensuring the stability of the process temperature within the extraction tank. Furthermore, the system, composed of industrial-grade control components, features fast response speed and strong anti-interference capabilities, and can adapt to complex operating conditions in wet processes.

[0043] This application also provides a lithium battery separator extraction tank, which includes the push-pull heating structure described in the above specific embodiment. The push-pull heating structure includes a frame, a slide assembly 6, and a heating plate 7. The frame consists of a horizontally parallel branch pipe 1 and a manifold 2. The branch pipe 1 has a medium inlet 4, and the manifold 2 has a medium outlet 5. Both have multiple infusion ports 3 on their side walls. The slide assembly 6 is mounted on the frame. Each slide assembly 6 includes a heating plate 7 arranged axially along the branch pipe 1. The heating plate 7 has a serpentine circulation channel and is connected to the infusion ports 3 of the branch pipe 1 and the manifold 2 via quick-connect components.

[0044] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A push-pull heating structure, characterized in that, include: The frame has a shunt tube (1) and a manifold tube (2) arranged parallel to each other in the horizontal direction. The sidewalls of the shunt tube (1) and the manifold tube (2) are provided with a plurality of infusion ports (3) along the axial direction. The shunt tube (1) is provided with a medium inlet (4) and the manifold tube (2) is provided with a medium outlet (5). At least two sets of slide assemblies (6) are provided on the frame. Each set of slide assemblies (6) is provided with at least one heating plate (7) arranged along the axial direction of the diversion pipe (1). The heating plate (7) is provided with a serpentine circulation channel. The input end of the serpentine circulation channel is connected to the infusion interface (3) of the diversion pipe (1) through a first quick-connect assembly (8), and the output end is connected to the infusion interface (3) of the manifold (2) through a second quick-connect assembly (9).

2. The push-pull heating structure according to claim 1, characterized in that, The heating plate (7) includes two plate covers (70) and multiple sets of parallel corrugated plates (71). The corrugated plates (71) are sandwiched between the two plate covers (70) and are connected to the plate covers (70) by brazing. A serpentine flow channel is formed between the corrugated plates (71), and adjacent serpentine flow channels are connected end to end to form the serpentine circulation channel.

3. The push-pull heating structure according to claim 2, characterized in that, The wave crest height of the wave plate (71) is 2-5 mm and the wave pitch is 10-20 mm. Adjacent wave plates (71) are staggered and superimposed to form a honeycomb turbulent structure.

4. The push-pull heating structure according to claim 1, characterized in that, The medium flowing through the serpentine circulation channel is water.

5. The push-pull heating structure according to claim 1, characterized in that, The slide assembly (6) includes a lower slide rail located at the top of the diverter pipe (1) and an upper slide rail located at the bottom of the manifold pipe (2). The bottom of the heating plate (7) is provided with a roller assembly (10).

6. The push-pull heating structure according to claim 1, characterized in that, The first quick-connect assembly (8) and the second quick-connect assembly (9) both include a flange interface (80), a metal bellows (81) and a quick-connect connector (82). The flange interface (80) is welded to the infusion interface (3). The metal bellows (81) is connected to the flange interface (80). The female connector of the quick-connect connector (82) is connected to the metal bellows (81). The input and output ends of the serpentine circulation channel are both provided with the male connector of the quick-connect connector (82).

7. The push-pull heating structure according to claim 1, characterized in that, The heating plate (7) is made of aluminum alloy or copper alloy.

8. The push-pull heating structure according to claim 1, characterized in that, Temperature sensors are spaced apart on the branch pipe (1) and the manifold (2). A turbine flow meter and an electric regulating valve are provided at the medium inlet (4). The turbine flow meter, the electric regulating valve and the temperature sensors form a closed-loop temperature control system through a PID controller.

9. A lithium battery separator extraction tank, characterized in that, Includes the push-pull heating structure as described in any one of claims 1 to 8.

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