Lithium battery diaphragm wet casting system
By using a combination of magnetic adsorption device and casting roller in the lithium battery separator wet casting system, the problem of separator fluid falling off at the casting roller is solved, achieving smooth separator transfer and time saving.
Patent Information
- Application Number
- CN202520122340.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-17
AI Technical Summary
In existing lithium battery separator wet casting systems, the separator fluid is prone to falling off the casting rollers during the membrane insertion process, resulting in poor conveying and wasted time.
A magnetic adsorption device, such as a magnet, is used to adhere to the fluid surface of the diaphragm, making it stick tightly to the roller surface of the casting roller. Combined with the design of the guide roller and cooling roller, this ensures smooth fluid transfer.
The problem of fluid detachment from the diaphragm was solved, enabling smooth diaphragm transfer and saving time on diaphragm insertion.
Smart Images
Figure CN223834994U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of lithium battery separator production technology, and in particular to a lithium battery separator wet casting system. Background Technology
[0002] The separator is the core component in lithium-ion battery manufacturing. Lithium-ion battery separators are generally classified into dry and wet processes based on their manufacturing process. The production of wet-process separators requires a feeding system, extrusion system, casting system, longitudinal stretching system, primary transverse stretching system, extraction and drying system, secondary transverse stretching system, and traction winding system. The casting system plays a crucial role in causing thermally induced phase separation between the pore-forming agent and the polyolefin, forming thick sheets. The casting system significantly impacts the thickness uniformity of the lithium-ion battery separator.
[0003] Currently, the method for threading the diaphragm in the casting system involves the die extruding diaphragm fluid, which the operator then cuts and adheres to the surface of the casting roller. The viscosity between the roller and the fluid is then used to carry the diaphragm to the next stage. However, this method often results in insufficient viscosity between the roller and the fluid, causing the fluid to detach from the roller and fail to reach the next stage, thus wasting threading time. Utility Model Content
[0004] To address the issue of membrane fluid easily detaching from the casting roller during membrane fabrication, this application provides a wet casting system for lithium battery separators, comprising a die, a casting roller, and an adsorption device. The casting roller is located at the outlet of the die; the die is used to extrude the membrane fluid; the casting roller is used to adhere the membrane fluid to form a casting sheet; and the adsorption device is used to adsorb onto the surface of the membrane fluid, ensuring that the membrane fluid adheres tightly to the roller surface of the casting roller.
[0005] Furthermore, the adsorption device is a magnet, and the casting roller is made of magnetic material.
[0006] Furthermore, the magnet is rectangular in shape.
[0007] Furthermore, the casting roll is a chilling roll.
[0008] Furthermore, it also includes a guide roller; the guide roller is disposed in front of the casting roller and is used to press the diaphragm fluid onto the roller surface of the casting roller.
[0009] Furthermore, the diameter of the guide roller is smaller than the diameter of the casting roller.
[0010] Furthermore, it also includes a plurality of cooling rollers; the plurality of cooling rollers are disposed behind the casting roller for cooling the casting.
[0011] Furthermore, the diameter of the cooling roller is smaller than the diameter of the casting roller.
[0012] The above-mentioned technical solution of this application has the following advantages:
[0013] The lithium battery separator wet casting system provided in this application includes a die, a casting roller, and an adsorption device. The casting roller is located at the outlet of the die. The die is used to extrude separator fluid, and the casting roller is used to attach the separator fluid to form a casting. By adsorbing the separator fluid onto the surface of the separator fluid using the adsorption device, the separator fluid is tightly attached to the roller surface of the casting roller. This solves the problem that the separator fluid easily falls off the casting roller during membrane threading, allowing the separator to be smoothly conveyed to the subsequent stage. The separator fluid will not slip off the casting roller, saving membrane threading time. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0015] Figure 1 This is a schematic diagram of the lithium battery separator wet casting system provided in this application.
[0016] Reference numerals: 1. Die head; 2. Casting roller; 3. Adsorption device; 4. Guide roller; 5. Cooling roller. Detailed Implementation
[0017] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.
[0018] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0020] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.
[0021] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.
[0022] like Figure 1 As shown in the figure, this application provides a lithium battery separator wet casting system, including a die head 1, a casting roller 2 and an adsorption device 3. The casting roller 2 is disposed at the outlet of the die head 1. The die head 1 is used to extrude separator fluid. The casting roller 2 is used to attach the separator fluid to form a casting. The adsorption device 3 is used to adsorb the separator fluid on the surface of the separator fluid, so that the separator fluid is tightly attached to the roller surface of the casting roller 2.
[0023] By adsorbing the adsorption device 3 onto the surface of the diaphragm fluid, the diaphragm fluid adheres tightly to the roller surface of the casting roller 2, which solves the problem that the diaphragm fluid easily falls off the casting roller 2 during the film-making process. This allows the diaphragm to be smoothly conveyed to the later stage, and the diaphragm fluid will not slip off the casting roller 2, saving film-making time.
[0024] In some embodiments, the adsorption device 3 is a magnet, and the casting roller 2 is made of magnetic material.
[0025] In some embodiments, the magnet is rectangular in shape.
[0026] In some embodiments, the casting roll 2 is a chilling roll.
[0027] like Figure 1As shown, in some embodiments, a guide roller 4 is also included; the guide roller 4 is disposed in front of the casting roller 2 and is used to press the diaphragm fluid onto the roller surface of the casting roller 2.
[0028] like Figure 1 As shown, in some embodiments, the diameter of the guide roller 4 is smaller than the diameter of the casting roller 2.
[0029] like Figure 1 As shown, in some embodiments, a plurality of cooling rollers 5 are also included; the plurality of cooling rollers 5 are disposed behind the casting roller 2 for cooling the casting.
[0030] like Figure 1 As shown, in some embodiments, the diameter of the cooling roller 5 is smaller than the diameter of the casting roller 2.
[0031] To address the issue of membrane fluid easily detaching from the chill roller during membrane casting, this application provides a wet casting system for lithium battery separators, comprising a die head 1, a casting roller 2, and an adsorption device 3. The casting roller 2 can be a chill roller, and the adsorption device 3 can be a rectangular magnet.
[0032] Die 1 extrudes diaphragm fluid. The operator cuts the fluid and attaches it to the surface of the quench roller. At the same time, a rectangular magnet is used to attract the fluid to the surface of the fluid. The magnetic force of the magnet attracts the fluid and makes it stick tightly to the surface of the quench roller. The magnet attracts the fluid and rotates with the roller surface, bringing the membrane to the cooling roller 5 at the rear.
[0033] The fluid flowing down from the die head 1 cannot be bound by the threading rope, but the magnet can attract the fluid and keep it pressed against the surface of the casting roller 2. After passing through the casting roller 2, the fluid forms a casting sheet. At this point, the magnet is no longer needed, and the casting sheet can be bound by the threading rope and passed through the cooling roller 5. By using magnetic attraction to allow the fluid to pass through the casting roller 2, the fluid will not slip off the casting roller 2, saving threading time.
[0034] The lithium battery separator wet casting system provided in this application embodiment adsorbs the separator fluid onto the surface of the separator fluid by adsorbing the separator fluid onto the surface of the casting roller. This solves the problem that the separator fluid is easy to fall off the casting roller during the casting process, allowing the separator to be smoothly conveyed to the later stage. The separator fluid will not slip off the casting roller, saving casting time.
[0035] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application.
[0036] It should be clarified that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. This application is not limited to the specific structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.
[0037] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A wet casting system for lithium battery separators, characterized in that, The device includes a die head, a casting roller, and an adsorption device. The casting roller is located at the outlet of the die head. The die head is used to extrude diaphragm fluid. The casting roller is used to attach the diaphragm fluid to form a casting. The adsorption device is used to adsorb the diaphragm fluid onto the surface of the casting roller, so that the diaphragm fluid is tightly attached to the roller surface of the casting roller.
2. The lithium battery separator wet casting system as described in claim 1, characterized in that, The adsorption device is a magnet, and the casting roller is made of magnetic material.
3. The lithium battery separator wet casting system as described in claim 2, characterized in that, The magnet is rectangular in shape.
4. The lithium battery separator wet casting system as described in claim 1, characterized in that, The casting roller is a chilling roller.
5. The lithium battery separator wet casting system as described in claim 1, characterized in that, It also includes a guide roller; the guide roller is disposed in front of the casting roller and is used to press the diaphragm fluid onto the roller surface of the casting roller.
6. The lithium battery separator wet casting system as described in claim 5, characterized in that, The diameter of the guide roller is smaller than the diameter of the casting roller.
7. The lithium battery separator wet casting system as described in claim 1, characterized in that, It also includes multiple cooling rollers; the multiple cooling rollers are disposed behind the casting roller for cooling the casting.
8. The lithium battery separator wet casting system as described in claim 7, characterized in that, The diameter of the cooling roller is smaller than the diameter of the casting roller.