Lithium battery diaphragm forming equipment
By combining concave rollers and casting rollers in the design, problems such as air bubbles and material accumulation after roller pressing in the production of lithium battery separators were solved, thereby improving production efficiency and product quality consistency.
Patent Information
- Application Number
- CN202520113383.7
- 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 the current lithium battery separator production process, problems such as air bubbles, material accumulation, and oil stains are easily generated after the calendering process is rolled together, resulting in low production efficiency and inconsistent product quality.
The concave roller with a smaller diameter in the middle section than at both ends is designed as a guide roller to press against the casting roller, ensuring uniform thickness of the casting sheet. A cooling roller is installed between the guide roller and the casting roller for cooling.
It improved production efficiency, enhanced product quality and performance consistency, and resolved defects caused by fluid after roller pressing.
Smart Images
Figure CN223834907U_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 forming equipment. Background Technology
[0002] Regarding the calendering process in lithium battery separator extruders, the industry currently uses two production methods: calendering and casting. Calendering involves pressing a guide roller onto a casting roller, using the gap between the two rollers to control the thickness of the cast sheet. If the pressing gap is too small, problems such as air bubbles can easily form in the melt, making production impossible. If the pressing gap is too large, it can lead to thickness variations, deformation, edge collapse, and poor consistency in performance indicators. In existing methods of controlling sheet thickness, because both the cooling roller and the guide roller are straight rollers, the sheet thickness after forming is also horizontal. However, during the stretching process after sheet forming, the stretching direction is not uniform; instead, the middle part of the sheet is stretched first, followed by the ends, resulting in poor consistency in thickness, stretching, and deformation after separator stretching. Utility Model Content
[0003] The technical problem this application aims to solve is that the pressing process after roller pressing causes problems such as material accumulation, air bubbles, and oil stains, which reduce production efficiency and product quality. This application seeks to solve a series of defects caused by fluid after roller pressing, and at the same time solve the problem of poor product performance consistency.
[0004] To overcome the above-mentioned defects, this application provides a lithium battery separator forming equipment, which includes a guide roller and a casting roller; the guide roller is a concave roller with a diameter smaller in the middle than at both ends; the guide roller is used to press the casting roller onto the casting roller and control the thickness of the casting sheet between the guide roller and the casting roller.
[0005] Furthermore, the diameter of the roller decreases sequentially from both ends to the middle.
[0006] Furthermore, the diameter of the middle part of the roller is 0.3mm ± 0.2mm smaller than the diameters of the two ends.
[0007] Furthermore, the casting roller is a straight roller with the same diameter everywhere.
[0008] Furthermore, the casting roll is a chilling roll.
[0009] Furthermore, the lithium battery separator forming equipment also includes multiple cooling rollers, which are arranged behind the guide roller and the casting roller for cooling the cast sheet material after pressing.
[0010] Furthermore, the cooling roller is a straight roller with the same diameter everywhere.
[0011] Furthermore, the lithium battery separator forming equipment also includes a base, on which the guide roller, the casting roller, and the plurality of cooling rollers are all disposed.
[0012] The above-mentioned technical solution of this application has the following advantages:
[0013] The lithium battery separator forming equipment provided in this application, by designing the guide roller as a concave roller with a smaller diameter in the middle than at both ends, allows for uniform pressing of the middle and both sides of the cast sheet material when the guide roller presses it onto the casting sheet roller. Because the fluid of the cast sheet material itself is thicker in the middle and thinner at both ends, the guide roller can achieve uniform pressing of the middle part and both sides of the cast sheet material. The guide roller design is more in line with the distribution of fluid, which can effectively solve the problem of material accumulation in the middle during equipment operation, improve production efficiency and product quality, and achieve more uniform stretching of the cast sheet material during subsequent stretching. It also solves a series of defects caused by fluid after the guide roller pressing and solves the problem of poor product performance consistency. 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 A schematic diagram of the guide roller and the casting roller provided in this application;
[0016] Figure 2 This is a schematic diagram of the lithium battery separator forming equipment provided in this application.
[0017] Reference numerals: 1. Guide roller; 2. Casting roller; 3. Cooling roller; 4. Base. Detailed Implementation
[0018] 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.
[0019] 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.
[0020] 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.
[0021] 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.
[0022] 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.
[0023] like Figure 1 As shown in the figure, this application provides a lithium battery separator forming equipment, which includes a guide roller 1 and a casting roller 2; the guide roller 1 is a concave roller with a diameter in the middle that is smaller than the diameters at both ends; the guide roller 1 is used to press the casting roller 2 onto the casting roller 2 and control the thickness of the casting sheet between the guide roller 1 and the casting roller 2.
[0024] After the fluid is extruded from the cast sheet, the fluid thickness is thicker in the middle and thinner at both ends. This roller design better matches the fluid distribution, and the equipment can effectively solve the problem of material accumulation in the middle during operation. Because the fluid itself is thicker in the middle and thinner at both ends, the straight roller and the roller pressing together will cause the edges to not be pressed properly, while the concave roller can achieve uniform pressing in the middle and on both sides.
[0025] By designing the guide roller as a concave roller with a smaller diameter in the middle than at both ends, when the guide roller presses against the casting sheet roller, because the fluid of the casting sheet itself is thicker in the middle and thinner at both ends, the guide roller can achieve uniform pressing of the middle part and both sides of the casting sheet. The guide roller design is more in line with the distribution of fluid, which can effectively solve the problem of material accumulation in the middle during equipment operation, improve production efficiency and product quality, and also achieve more uniform stretching of the casting sheet during subsequent stretching. This solves a series of defects caused by fluid after the guide roller is pressed, and at the same time solves the problem of poor product performance consistency.
[0026] In some embodiments, the diameter of the roller 1 decreases sequentially from both ends to the middle.
[0027] In some embodiments, the diameter of the middle portion of the roller 1 is 0.3 mm ± 0.2 mm smaller than the diameters of the two ends.
[0028] The curvature of the side of the guide roller can be changed to correspond to the curvature of the fluid in the die casting. The size of the guide roller is designed, and a medium-low gap is made between the guide roller 1 and the casting roller 2, that is, the guide roller 1 is designed as a concave roller. The diameter of the concave roller is designed to be 0.3mm±0.2mm smaller in the middle than at both ends, to ensure that the fluid in the casting sheet can pass smoothly through the gap between the guide roller 1 and the casting roller 2 and be formed.
[0029] In some embodiments, the casting roller 2 is a straight roller with the same diameter everywhere.
[0030] In some embodiments, the casting roll 2 is a chilling roll.
[0031] In some embodiments, the lithium battery separator forming equipment further includes a plurality of cooling rollers 3, which are disposed behind the guide roller 1 and the casting roller 2 for cooling the cast sheet material after pressing.
[0032] In some embodiments, the cooling roller 3 is a straight roller with the same diameter everywhere.
[0033] In some embodiments, the lithium battery separator forming equipment further includes a base 4, and the guide roller 1, the casting roller 2 and the plurality of cooling rollers 3 are all disposed on the base 4.
[0034] The lithium battery separator forming equipment provided in this application embodiment, by designing the guide roller as a concave roller with a smaller diameter in the middle than at both ends, allows for uniform pressing of the middle and both sides of the cast sheet material when the guide roller presses it onto the casting sheet roller. Because the fluid of the cast sheet material itself is thicker in the middle and thinner at both ends, the guide roller can achieve uniform pressing of the middle part and both sides of the cast sheet material. The guide roller design is more in line with the distribution of fluid, which can effectively solve the problem of material accumulation in the middle during equipment operation, improve production efficiency and product quality, and achieve more uniform stretching of the cast sheet material during subsequent stretching. This solves a series of defects caused by fluid after the guide roller pressing, and also solves the problem of poor product performance consistency.
[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 lithium battery separator forming equipment, characterized in that, The lithium battery separator forming equipment includes a guide roller and a casting roller; the guide roller is a concave roller with a diameter smaller in the middle than at both ends; the guide roller is used to press the casting roller onto the casting roller and control the thickness of the casting sheet between the guide roller and the casting roller.
2. The lithium battery separator forming equipment as described in claim 1, characterized in that, The diameter of the roller decreases sequentially from both ends to the middle.
3. The lithium battery separator forming equipment as described in claim 1, characterized in that, The diameter of the middle part of the roller is 0.3mm ± 0.2mm smaller than the diameters of the two ends.
4. The lithium battery separator forming equipment as described in claim 1, characterized in that, The casting roller is a straight roller with the same diameter everywhere.
5. The lithium battery separator forming equipment as described in claim 1, characterized in that, The casting roller is a chilling roller.
6. The lithium battery separator forming equipment as described in claim 1, characterized in that, The lithium battery separator forming equipment also includes multiple cooling rollers, which are arranged behind the guide roller and the casting roller to cool the cast sheet material after pressing.
7. The lithium battery separator forming equipment as described in claim 6, characterized in that, The cooling roller is a straight roller with the same diameter everywhere.
8. The lithium battery separator forming equipment as described in claim 6, characterized in that, The lithium battery separator forming equipment also includes a base, on which the guide roller, the casting roller and the plurality of cooling rollers are all mounted.