Preparation device of film-coated lithium strip
By designing a film-coated lithium strip preparation device, the transportation and lamination problems caused by insufficient or excessive peel force between lithium foil and film were solved. This achieved stable lamination of lithium foil and film with high peel force and high utilization rate, avoiding material sticking.
Patent Information
- Application Number
- CN202423090255.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-13
AI Technical Summary
In the existing technology, the peel force between the ultra-thin lithium strip and the liner is insufficient or excessive after rolling, which makes it easy to detach during transportation or difficult to combine with copper foil. In addition, it is easy to stick to materials during the production process, making it difficult to achieve stable production.
A coated lithium strip preparation apparatus is used, including a primary rolling unit and a secondary rolling coating unit. By utilizing a combination design of release film and liner film, a stable coating of lithium foil and liner film is formed through primary rolling and secondary rolling. A silicone oil layer is coated between the lithium foil and the liner film to improve peel strength and prevent material sticking.
It achieves high peel strength between lithium foil and liner, making the lithium foil less prone to deformation or breakage during transportation. It is easy to combine with copper foil or electrode sheet during lamination, with a lithium foil utilization rate of up to 98%, and solves the problem of material sticking.
Smart Images
Figure CN223625000U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium strip processing technology, and in particular to a preparation apparatus for a coated lithium strip. Background Technology
[0002] With the increasing demand for high-energy-density and high-safety chemical power sources in electronic products such as smartphones, tablets, and electric vehicles, the energy density development space of commercial lithium-ion secondary batteries with graphite as the negative electrode is limited, almost reaching its limit. Currently used organic electrolytes have safety issues such as flammability, corrosion, and poor thermal stability, which restricts the development of traditional lithium-ion batteries. Solid-state batteries can solve the above-mentioned safety hazards. Compared with traditional lithium-ion batteries, solid-state batteries have higher energy density, longer cycle life, and better safety.
[0003] Currently used solid-state battery anodes are generally made by laminating ultra-thin lithium strips (10µm-50µm thick) onto copper foil or electrode sheets. Because lithium metal is very soft, after the ultra-thin lithium strip is calendered and separated from the release film, it adheres to a liner and is wound together. When pressing the ultra-thin lithium strip and copper foil or electrode sheet together using a pressing device, the liner needs to be peeled off from the ultra-thin lithium strip beforehand. However, this post-calendering process results in almost zero peeling force between the liner and the lithium strip, making it prone to detaching from the separator and breaking during transport before lamination. If the lithium strip is not separated from the release film after calendering and the release film is used directly as the liner, the peeling force between the lithium strip and the liner is too great, making peeling impossible and preventing proper lamination of the lithium strip onto the copper foil or electrode sheet. Furthermore, due to the inherent characteristics of lithium metal, there is a problem of material adhesion during the slitting and extrusion process to produce ultra-thin lithium strips.
[0004] Developing a coating-type lithium strip preparation device that facilitates lithium strip transportation, allows for easy peeling from the coating and lamination with other metal sheets, and prevents material sticking to the rollers during the rolling process, has become a technical challenge that urgently needs to be solved by those skilled in the art. Utility Model Content
[0005] The purpose of this invention is to provide an apparatus for preparing coated lithium strips, thereby solving the problems listed in the background art.
[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0007] This utility model discloses a preparation device for coated lithium strips, including a mounting plate, wherein a primary rolling unit and a secondary rolling coating unit are sequentially mounted in the middle of the mounting plate.
[0008] A lithium strip unwinding roller is installed at one end of the mounting plate, and a lithium strip guide is installed between the lithium strip unwinding roller and the middle of the primary rolling unit; a lithium foil smoothing roller group is installed between the middle of the primary rolling unit and the secondary rolling and coating unit.
[0009] A coated lithium belt take-up roller is installed at the other end of the mounting plate;
[0010] A coated lithium strip guide is installed in the middle of the coated lithium strip take-up roller and the secondary rolling coated unit.
[0011] The lithium strip is wound on the unwinding roller, and the free end of the lithium strip passes through the lithium strip guide, the primary rolling unit, the lithium foil smoothing roller group, the secondary rolling coating unit, and the coated lithium strip guide in sequence and is wound on the coated lithium strip take-up roller.
[0012] Preferably, the primary rolling unit includes a release film unwinding roll group, a primary rolling roll group, and a release film take-up roll group;
[0013] The release film unwinding roller group, the primary rolling roller group, and the release film take-up roller group are each provided with upper and lower rollers, and the lithium belt divides the release film unwinding roller group, the primary rolling roller group, and the release film take-up roller group into upper and lower parts.
[0014] Preferably, both the upper and lower rollers of the release film unwinding roller group are wound with release film, and the free end of the release film on the upper roller of the release film unwinding roller group passes through the lower surface of the upper roller of the primary rolling roller group and winds around the upper roller of the release film take-up roller group.
[0015] The free end of the release film on the lower roller of the release film unwinding roller group is wound around the lower roller of the release film take-up roller group via the upper surface of the lower roller of the primary rolling roller group.
[0016] Preferably, the secondary rolling and coating unit includes a film unwinding roll group, a secondary rolling roll group, and a film take-up roll. The film unwinding roll group and the secondary rolling roll group are each provided with upper and lower rolls, and the lithium belt divides the film unwinding roll group and the secondary rolling roll group into upper and lower parts.
[0017] The upper roll and the lower roll of the film unwinding roll assembly are both wound with film. The free end of the film on the upper roll of the film unwinding roll assembly is wound onto the film take-up roll via the lower surface of the upper roll of the secondary rolling roll assembly.
[0018] The free end of the liner on the lower roll of the liner unwinding roll group is pressed onto the lower surface of the lithium strip by the upper surface of the lower roll of the secondary rolling roll group.
[0019] Preferably, the liner and the lithium strip are wound around the film-coated lithium strip take-up roller.
[0020] Preferably, the liner is any one of polypropylene film, polyethylene film, or a mixture of polypropylene and polyethylene film, the liner does not require pretreatment, and the liner is coated with a silicone oil layer.
[0021] Compared with the prior art, the beneficial technical effects of this utility model are as follows:
[0022] 1) Compared with ordinary lithium foils that are attached to a layer of film and rolled together, the preparation method of the coated lithium strip of this utility model has higher peel strength between the lithium foil and the film, and the lithium foil is not easy to deform or break during transportation before lamination. The lithium foil utilization rate is ≥98% during lamination.
[0023] 2) When this type of coated lithium strip is used to coat copper foil or electrode, the lithium foil will not fall off the film during transportation before coating due to its own weight, causing the lithium strip to deform or break. It is also easy to separate from the film during the coating process and can be normally coated with copper foil or electrode. It will not stick to the film and become impossible to separate due to excessive peeling force.
[0024] 3) The liner is coated with a silicone oil layer, which makes the surface of the ultra-thin lithium strip oily, thus solving the problem of material sticking during the slitting of ultra-thin lithium strips produced by extrusion. Attached Figure Description
[0025] The present invention will be further described below with reference to the accompanying drawings.
[0026] Figure 1 This is a front view schematic diagram of the apparatus for preparing a coated lithium strip according to the present invention.
[0027] Explanation of reference numerals in the attached drawings: 1. Lithium strip unwinding roller; 2. Lithium strip guide; 3. Release film unwinding roller assembly; 4. Primary rolling roller assembly; 5. Release film take-up roller assembly; 6. Lithium foil smoothing roller assembly; 7. Lining unwinding roller assembly; 8. Secondary rolling roller assembly; 9. Lining take-up roller; 10. Coated lithium strip guide; 11. Coated lithium strip take-up roller; 12. Mounting plate. Detailed Implementation
[0028] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0029] like Figure 1 As shown, a preparation apparatus for coated lithium strip includes a mounting plate 12, wherein a primary rolling unit and a secondary rolling coating unit are sequentially mounted in the middle of the mounting plate 12.
[0030] A lithium strip unwinding roller 1 is installed at one end of the mounting plate 12, and a lithium strip guide 2 is installed between the lithium strip unwinding roller 1 and the middle of the primary rolling unit; a lithium foil smoothing roller group 6 is installed between the middle of the primary rolling unit and the secondary rolling coating unit.
[0031] A coated lithium belt take-up roller 11 is installed at the other end of the mounting plate 12;
[0032] A coated lithium strip take-up roller 11 and a coated lithium strip guide 10 are installed in the middle of the secondary rolling and coating unit;
[0033] The lithium strip is wound on the unwinding roller 1, and the free end of the lithium strip passes through the lithium strip guide 2, the primary rolling unit, the lithium foil smoothing roller group 6, the secondary rolling coating unit and the coating type lithium strip guide 10 in sequence and is wound on the coating type lithium strip take-up roller 11.
[0034] Specifically, the primary rolling unit includes a release film unwinding roller group 3, a primary rolling roller group 4, and a release film take-up roller group 5;
[0035] The release film unwinding roller group 3, the primary rolling roller group 4, and the release film take-up roller group 5 are each provided with upper and lower rollers, and the lithium belt divides the release film unwinding roller group 3, the primary rolling roller group 4, and the release film take-up roller group 5 into upper and lower parts.
[0036] Specifically, release film is wound on both the upper roller and the lower roller of the release film unwinding roller group 3. The free end of the release film on the upper roller of the release film unwinding roller group 3 passes through the lower surface of the upper roller of the primary rolling roller group 4 and is wound on the upper roller of the release film take-up roller group 5.
[0037] The free end of the release film on the lower roller of the release film unwinding roller group 3 is wound around the lower roller of the release film take-up roller group 5 via the upper surface of the lower roller of the primary rolling roller group 4.
[0038] Specifically, the secondary rolling and coating unit includes a film unwinding roll group 7, a secondary rolling roll group 8, and a film take-up roll 9. The film unwinding roll group 7 and the secondary rolling roll group 8 are each provided with upper and lower rolls, and the lithium belt divides the film unwinding roll group 7 and the secondary rolling roll group 8 into upper and lower parts.
[0039] The upper and lower rollers of the film unwinding roller group 7 are both wound with film. The free end of the film on the upper roller of the film unwinding roller group 7 is wound onto the film take-up roller 9 via the lower surface of the upper roller of the secondary rolling roller group 8.
[0040] The free end of the liner on the lower roll of the liner unwinding roll group 7 is pressed onto the lower surface of the lithium strip by the upper surface of the lower roll of the secondary rolling roll group 8.
[0041] Specifically, the liner and the lithium strip are wound around the film-coated lithium strip take-up roller 11.
[0042] A method for preparing a coated lithium strip includes the following steps:
[0043] S1. In a single rolling process, the release film unwinding roller group and the release film take-up roller group work to wrap the release film on the upper roller and the lower roller of the single rolling roller group. The free end of the lithium strip enters the single rolling roller group through the lithium strip guide device to form a lithium foil in a single rolling process, and the lithium foil is peeled off from the release film.
[0044] S2, Smoothing: The lithium foil is smoothed by the lithium foil smoothing roller group;
[0045] S3, Lower film: After the smoothed lithium foil is rolled by a secondary rolling mill to form a lithium film, the lower surface of the lithium film is laminated with the liner film.
[0046] S4. Rewinding: The lithium film with the lower liner is wound onto the coated lithium strip take-up roller after passing through the coated lithium strip guide.
[0047] Specifically, in step S1, the thickness of the lithium strip is 0.1-1.2 mm, and the peel force between the lithium foil and the release film is 2-20 g.
[0048] Specifically, the thickness of the smoothed lithium foil in step S2 is 10-50 μm.
[0049] Specifically, the liner is any one of polypropylene film, polyethylene film, or a mixture of polypropylene and polyethylene film. The liner does not require pretreatment and is coated with a silicone oil layer.
[0050] Specifically, in step S3, the pressure when the lithium film and the liner film are laminated is 0.1-1 MPa, and the rolling speed of the secondary rolling roll group is 5-50 m / min.
[0051] Example 1
[0052] 1) Prepare 0.2mm thick lithium strip, two sets of lithium foil calendering release film, and two sets of polypropylene film;
[0053] 2) The lithium strip calendering release film is assembled onto the release film unwinding roller group 3 and passes through the primary rolling roller group 4 to be assembled onto the release film take-up roller group 5; the polypropylene film is assembled onto the liner unwinding roller group 7 and passes through the secondary rolling roller group 8; the upper liner is assembled onto the upper roller of the liner take-up roller group 9; the lower liner passes through the coated lithium strip guide 10 and is assembled onto the coated lithium strip take-up roller 11; the lithium strip is assembled onto the lithium strip unwinding roller 1, passes through the lithium strip guide 2, the primary rolling roller group 4, the lithium foil smoothing roller group 6, the secondary rolling roller group 8, and the coated lithium strip guide 10 in sequence, and is assembled onto the coated lithium strip take-up roller 11.
[0054] 3) Set the rolling pressure to 1.0 MPa and the speed to 5 m / min, roll the 0.2 mm thick lithium strip into a 10 μm lithium foil, and separate it from the release film;
[0055] 4) Set the secondary rolling pressure to 0.3 MPa and the speed to 5 m / min, and coat the lithium film onto the liner to obtain a coated lithium strip with a peel force of 5 g and a lithium film thickness of 10 μm.
[0056] Example 2
[0057] 1) Prepare 0.2mm thick lithium strip, two sets of lithium foil calendering release film, and two sets of polypropylene film.
[0058] 2) The release film for lithium foil calendering is assembled onto the release film unwinding roller group 3 and passes through the primary rolling roller group 4 to be assembled onto the release film take-up roller group 5; the polypropylene film is assembled onto the liner unwinding roller group 7 and passes through the secondary rolling roller group 8; the upper liner is assembled onto the upper roller of the liner take-up roller group 9; the lower liner passes through the coated lithium strip guide 10 and is assembled onto the coated lithium strip take-up roller 11; the lithium strip is assembled onto the lithium strip unwinding roller 1, passes through the lithium strip guide 2, the primary rolling roller group 4, the lithium foil smoothing roller group 6, the secondary rolling roller group 8, and the coated lithium strip guide 10 in sequence, and is assembled onto the coated lithium strip take-up roller 11.
[0059] 3) Set the rolling pressure to 0.9 MPa and the speed to 8 m / min, roll the 0.2 mm thick lithium strip into a 20 μm lithium foil, and separate it from the release film;
[0060] 4) Set the secondary rolling pressure to 0.33 MPa and the speed to 8 m / min, and coat the lithium film onto the liner to obtain a coated lithium strip with a peel force of 5 g and a lithium foil thickness of 20 μm.
[0061] Example 3
[0062] 1) Prepare 0.2mm thick lithium strip, two sets of lithium foil calendering release film, and two sets of polypropylene film;
[0063] 2) The release film for lithium foil calendering is assembled onto the release film unwinding roller group 3 and passes through the primary rolling roller group 4 to be assembled onto the release film take-up roller group 5; the polypropylene film is assembled onto the liner unwinding roller group 7 and passes through the secondary rolling roller group 8; the upper liner is assembled onto the upper roller of the liner take-up roller group 9; the lower liner passes through the coated lithium strip guide 10 and is assembled onto the coated lithium strip take-up roller 11; the lithium strip is assembled onto the lithium strip unwinding roller 1, passes through the lithium strip guide 2, the primary rolling roller group 4, the lithium foil smoothing roller group 6, the secondary rolling roller group 8, and the coated lithium strip guide 10 in sequence, and is assembled onto the coated lithium strip take-up roller 11.
[0064] 3) Set the rolling pressure to 0.7 MPa and the speed to 20 m / min, roll the 0.2 mm thick lithium strip into a 50 μm lithium foil, and separate it from the release film;
[0065] 4) Set the secondary rolling pressure to 0.35 MPa and the speed to 20 m / min, and coat the lithium film onto the liner to obtain a coated lithium strip with a peel force of 5 g and a lithium film thickness of 50 μm.
[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0067] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.
Claims
1. An apparatus for preparing a coated lithium strip, comprising a mounting plate (12), characterized in that: The mounting plate (12) is sequentially equipped with a primary rolling unit and a secondary rolling and coating unit in the middle. A lithium strip unwinding roller (1) is installed at one end of the mounting plate (12), and a lithium strip guide (2) is installed between the lithium strip unwinding roller (1) and the middle of the primary rolling unit; a lithium foil smoothing roller group (6) is installed between the middle of the primary rolling unit and the secondary rolling coating unit. A coated lithium belt take-up roller (11) is installed at the other end of the mounting plate (12); A coated lithium strip guide (10) is installed in the middle of the coated lithium strip take-up roller (11) and the secondary rolling coated unit; The lithium strip is wound on the lithium strip unwinding roller (1), and the free end of the lithium strip passes through the lithium strip guide (2), the primary rolling unit, the lithium foil smoothing roller group (6), the secondary rolling coating unit and the coating type lithium strip guide (10) in sequence and is wound on the coating type lithium strip take-up roller (11).
2. The apparatus for preparing a coated lithium strip according to claim 1, characterized in that: The primary rolling unit includes a release film unwinding roller group (3), a primary rolling roller group (4), and a release film take-up roller group (5); The release film unwinding roller group (3), the primary rolling roller group (4) and the release film take-up roller group (5) are each provided with two rollers, one upper and one lower, and the lithium belt separates the release film unwinding roller group (3), the primary rolling roller group (4) and the release film take-up roller group (5) into upper and lower parts.
3. The apparatus for preparing a coated lithium strip according to claim 2, characterized in that: Release film is wound on both the upper roller and the lower roller of the release film unwinding roller group (3). The free end of the release film on the upper roller of the release film unwinding roller group (3) passes through the lower surface of the upper roller of the primary rolling roller group (4) and is wound on the upper roller of the release film take-up roller group (5). The free end of the release film on the lower roller of the release film unwinding roller group (3) is wound around the lower roller of the release film take-up roller group (5) via the upper surface of the lower roller of the primary rolling roller group (4).
4. The apparatus for preparing a coated lithium strip according to claim 1, characterized in that: The secondary rolling and coating unit includes a film unwinding roll group (7), a secondary rolling roll group (8), and a film take-up roll (9). The film unwinding roll group (7) and the secondary rolling roll group (8) are each provided with upper and lower rolls, and the lithium belt divides the film unwinding roll group (7) and the secondary rolling roll group (8) into upper and lower parts. The upper roller and the lower roller of the film unwinding roller group (7) are both wound with film. The free end of the film on the upper roller of the film unwinding roller group (7) passes through the lower surface of the upper roller of the secondary rolling roller group (8) and is wound onto the film take-up roller (9). The free end of the liner on the lower roller of the liner unwinding roller group (7) is pressed onto the lower surface of the lithium strip by the upper surface of the lower roller of the secondary rolling roller group (8).
5. The apparatus for preparing a coated lithium strip according to claim 4, characterized in that: The liner and the lithium strip are wound around the film-coated lithium strip take-up roller (11).
6. The apparatus for preparing a coated lithium strip according to claim 5, characterized in that: The liner is any one of polypropylene film, polyethylene film, or a mixture of polypropylene and polyethylene film. The liner does not require pretreatment and is coated with a silicone oil layer.