Turning plate device for preventing escape of diaphragm extraction gas
By using a flap device to prevent the escape of gas extracted by the diaphragm, a sealed structure is formed by elastic hinges and vertical plates, which solves the problem of volatile gas escape during the extraction of lithium battery diaphragms, achieving good gas isolation and energy saving.
Patent Information
- Application Number
- CN202423258789.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-27
AI Technical Summary
During the extraction and drying process of lithium battery separators, volatile gases in the solvent are prone to escape, causing loss of extract and environmental pollution.
The device employs a flap device to prevent the escape of diaphragm extraction gas. It utilizes the synergistic cooperation of elastic hinges and vertical plates to form an elastic sealing structure, preventing the escape of volatile gases. The material passage gap is adjusted by a labyrinth seal and insert plates to accommodate diaphragm sheets of different thicknesses.
It effectively prevents solvent gas from escaping, saves energy, reduces extract loss, reduces environmental pollution, and achieves energy conservation and consumption reduction.
Smart Images
Figure CN223549815U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery separator processing technology, and more specifically to a flip-plate device for preventing the escape of separator extraction gas. Background Technology
[0002] Currently, the preparation processes for lithium-ion battery separators are mainly divided into two types: dry process (crystal separation method) and wet process (thermally induced phase separation method). The wet process can better control pore size, distribution, and porosity, so it is generally used to manufacture high-end thin films. In recent years, lithium battery separators prepared using the wet process have become increasingly popular in the market. For example, the wet asynchronous stretching process generally includes the following seven steps: 1) Feeding: Pre-treating raw materials such as PE and pore-forming agents according to the formula and feeding them into the extrusion system. 2) Casting: After the pre-treated raw materials are melted and plasticized in a twin-screw extrusion system, the melt is extruded from the die. The melt is then cast to form a thick sheet containing pore-forming agents. 3) Longitudinal stretching: The thick sheet is stretched longitudinally. 4) Transverse stretching: The longitudinally stretched sheet is stretched transversely to obtain a separator base film containing pore-forming agents. 5) Extraction: The separator base film is extracted with solvent in an extraction tank to form a separator base film without pore-forming agents. 6) Shaping: The membrane base membrane without pore-forming agent is dried and shaped to obtain a nanoporous membrane. 7) Slitting: The nanoporous membrane is cut into finished membranes according to the customer's specifications.
[0003] When drying after membrane extraction, a 50mm-200mm gap is usually left between the membrane and the extraction tank and drying chamber. Volatile gases in the solvent, such as dichloromethane, will be carried out as the membrane enters and exits the extraction tank and drying chamber. Especially when threading the membrane, there is usually a larger gap. Considering that after the membrane and rope are tied together during threading, about 10cm of rope ends pass through, more dichloromethane gas will escape rapidly outward due to the larger gap, causing loss of extract and adverse environmental impact. Utility Model Content
[0004] 1. The technical problem to be solved by the utility model:
[0005] To address the problem of volatile gases in the solvent easily escaping during the extraction and drying process of existing lithium battery separators, this invention provides a flap device to prevent the escape of extraction gases from the separator. Through the coordinated operation of the elastic hinge and the vertical plate, an elastic seal is formed when the battery separator passes through the material passage gap, thereby preventing the escape of solvent gases.
[0006] 2. Technical Solution:
[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:
[0008] A flap device for preventing the escape of extraction gas from a battery separator is used for gas isolation and sealing at the inlet and outlet of the extraction tank and in the drying chamber area of the battery separator. It includes vertical plates arranged symmetrically at the top and bottom, and elastic hinges connected to the fixed ends of the vertical plates. A material passage gap is reserved between the free ends of the upper and lower vertical plates for the battery separator to pass through. When the battery separator passes through the material passage gap, an elastic seal is formed between the battery separator and the free ends of the upper and lower vertical plates under the action of the elastic hinges to prevent the escape of volatile gases in the solvent. When a rope needs to pass through the membrane, the rope head collides with the vertical plate, and the two vertical plates open due to the tension of the rope head. After the rope head passes through the material passage gap, the vertical plates automatically return to their original positions under the action of the elastic hinges.
[0009] A further technical solution involves a vertical slot connected to the side of the vertical plate, into which an insert plate is inserted. The material passage gap is reserved between the free ends of the upper and lower insert plates. When the battery separator passes through the material passage gap, an elastic sealing structure is formed between the battery separator and the free ends of the upper and lower insert plates under the action of the elastic hinge. The size of the material passage gap can be adjusted by selecting upper and lower insert plates of different heights to accommodate battery separators of different thicknesses. Moreover, the insert plates are preferably non-metallic plates such as plastic, rubber, and resin to avoid excessive contact between the battery separator and the end face of the insert plate.
[0010] A further technical solution involves setting a labyrinth seal on the free end face of the insert plate to further reduce or even avoid the escape of volatile gases. The labyrinth seal is preferably made of non-metallic material to avoid excessive contact between the battery separator and the labyrinth seal.
[0011] A further technical solution involves an L-shaped vertical plate with a reinforcing plate connected to the side near the fixed end to improve the support strength of the vertical plate.
[0012] A further technical solution involves a bidirectional elastic hinge. When the rope end needs to pass through the membrane, it can collide with the vertical plate in both directions. The two insert plates open due to the tension of the rope end. After the rope end passes through the material passage gap, the two insert plates automatically return to their original positions under the action of the bidirectional elastic hinge.
[0013] 3. Beneficial effects:
[0014] Compared with the prior art, the technical solution provided by this utility model has the following advantages:
[0015] This utility model relates to a flap device for preventing the escape of gas extracted by a diaphragm. Before and after the rope end passes through the membrane, it is reset by a labyrinthine bidirectional elastic flap, which has a good gas isolation effect, saves energy, and reduces energy consumption. Attached Figure Description
[0016] Figure 1 A schematic diagram of the flip-plate state of the flip-plate device for preventing the escape of extraction gas from the diaphragm in a specific embodiment;
[0017] Figure 2 This is a front view of the flap device for preventing the escape of extraction gas from the diaphragm, according to a specific embodiment.
[0018] Figure 3 A schematic diagram of the flap device for preventing the escape of extraction gas from the diaphragm in a specific embodiment;
[0019] Figure 4 for Figure 2 A schematic diagram of the side view structure;
[0020] Figure 5 for Figure 2 A top-view structural diagram;
[0021] Figure 6 This is a schematic diagram of the flap device for preventing the escape of extraction gas from the diaphragm, as shown in a specific embodiment.
[0022] In the diagram: 1. Vertical plate; 2. Flexible hinge; 3. Insert plate; 8. Material passage gap; 10. Battery separator; 11. Slot; 12. Reinforcing plate; 20. Rope end; 31. Labyrinth seal. Detailed Implementation
[0023] To further understand the contents of this utility model, a detailed description of the utility model is provided in conjunction with the accompanying drawings.
[0024] Example 1
[0025] The flap device for preventing the escape of extraction gas from the separator in this embodiment is used to isolate and seal the gas in the inlet and outlet of the extraction tank of the battery separator 10 and the drying chamber area. The gas is a volatile gas in the solvent, such as dichloromethane gas. It includes vertical plates 1 arranged symmetrically on the top and bottom and elastic hinges 2 connected to the fixed ends of the vertical plates 1. A material passage gap 8 is reserved between the free ends of the upper and lower vertical plates 1 for the battery separator 10 to pass through.
[0026] In this embodiment, the flip-plate device for preventing the escape of diaphragm extraction gas is used in the following process: when the battery separator 10 passes through the material passage gap 8, an elastic sealing structure can be formed between the battery separator 10 and the free ends of the upper and lower vertical plates 1 under the action of the elastic hinge 2 to prevent the escape of volatile gases in the solvent; when the rope end 20 needs to pass through the membrane, the rope end 20 collides with the vertical plate 1, and the two vertical plates 1 are flipped open by the tension of the rope end 20. After the rope end 20 passes through the material passage gap 8, the vertical plate 1 automatically returns to its original position under the action of the elastic hinge 2.
[0027] Example 2
[0028] The flap device for preventing the escape of extraction gas from the diaphragm in this embodiment has the same basic structure as in Embodiment 1, with the difference or improvement being: (e.g.) Figure 1 , 2As shown in Figures 3, 4, 5, and 6, a vertical slot 11 is connected to the side of the vertical plate 1, and an insert plate 3 is inserted into the slot 11. After insertion, the insert plate 3 is fixed by a screw through a hole. The material passage gap 8 is reserved between the free ends of the upper and lower insert plates 3. At this time, when the battery separator 10 passes through the material passage gap 8, an elastic sealing structure is formed between the battery separator 10 and the free ends of the upper and lower insert plates 3 under the action of the elastic hinge 2. The size of the material passage gap 8 can be adjusted by selecting upper and lower insert plates 3 of different heights to accommodate battery separator 10 of different thicknesses. Moreover, the insert plate 3 is preferably made of non-metallic plates such as plastic, rubber, or resin to avoid excessive hard contact between the battery separator 10 and the end face of the insert plate 3.
[0029] A labyrinth seal 31 is provided on the free end face of the insert plate 3 to further reduce or even avoid the escape of volatile gases. The labyrinth seal 31 is preferably made of non-metallic material to avoid excessive contact between the battery separator 10 and the labyrinth seal 31.
[0030] The vertical plate 1 is an L-shaped plate, and a reinforcing plate 12 is connected to the side near the fixed end to improve the support strength of the vertical plate 1.
[0031] Elastic hinge 2 is a two-way elastic hinge.
[0032] The flapper device in this embodiment prevents the escape of extraction gas from the diaphragm, such as... Figure 1 As shown, when the rope end 20 needs to pass through the membrane, the rope end 20 can collide with the vertical plate 1 in both directions. The two insert plates 3 open due to the tension of the rope end 20. After the rope end 20 passes through the material passage gap 8, under the action of the bidirectional elastic hinge 2, the two insert plates 3 drive the entire device to automatically return to its original position. Before and after the rope end 20 passes through the membrane, it is reset by the labyrinthine bidirectional elastic hinge, which has a good gas isolation effect, saves energy, reduces energy consumption, and is environmentally friendly.
[0033] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention. The actual structure and manufacturing steps are not limited to these. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.
Claims
1. A flapper device for preventing the escape of extraction gas from a diaphragm, characterized in that: The gas isolation and sealing of the extraction tank inlet, outlet and drying chamber area of the battery separator (10) includes vertical plates (1) arranged symmetrically on the top and bottom and elastic hinges (2) connected to the fixed ends of the vertical plates (1); a material passage gap (8) is reserved between the free ends of the upper and lower vertical plates (1) for the battery separator (10) to pass through, and an elastic sealing structure is formed between the battery separator (10) and the free ends of the upper and lower vertical plates (1).
2. The flapper device for preventing the escape of extraction gas from the diaphragm as described in claim 1, characterized in that: The side of the vertical plate (1) is connected to a vertical slot (11), and a plug plate (3) is inserted into the slot (11); the material passage gap (8) is reserved between the free ends of the upper and lower plug plates (3).
3. The flapper device for preventing the escape of extraction gas from the diaphragm as described in claim 2, characterized in that: The free end face of the insert plate (3) is provided with a labyrinth seal (31).
4. The flapper device for preventing the escape of extraction gas from the diaphragm as described in claim 2, characterized in that: The vertical plate (1) is an L-shaped plate, and a reinforcing plate (12) is connected to the side near the fixed end.
5. The flapper device for preventing the escape of extraction gas from the diaphragm as described in any one of claims 1 to 4, characterized in that: The elastic hinge (2) is a two-way elastic hinge.