Ultrahigh solid content lithium battery self-supporting membrane and current collector composite equipment
By combining release film isolation and tension sensor detection, the problem of breakage during the composite process of the self-supporting film and the current collector was solved, the smooth composite of the self-supporting film and the current collector was achieved, and the battery performance was improved.
Patent Information
- Application Number
- CN202422714541.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-07
AI Technical Summary
The self-supporting film is easily broken during the composite process with the current collector due to its wetness and high viscosity, resulting in ineffective bonding.
A release film is used to isolate the wound self-supporting film and the current collector, and a tension sensor is used to detect the tension to avoid breakage, and the composite is achieved through a rolling structure.
It effectively solves the problem of breakage during the composite process of the self-supporting film and the current collector, ensuring the smooth composite process and the improvement of battery performance.
Smart Images
Figure CN223487066U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of new energy battery technology, specifically to a composite device for an ultra-high solids content lithium battery self-supporting membrane and current collector. Background Technology
[0002] Dry electrode is a coating technique that does not use liquid solvents to disperse active materials and conductive additives. It utilizes solid powder to directly mix active materials, conductive agents, and binders together, and then coats the mixture onto a current collector (such as aluminum or copper foil) by pressing or other mechanical methods, serving as the positive electrode, negative electrode, or solid electrolyte of a lithium-ion battery.
[0003] Compared to traditional wet coating techniques, dry electrode processes eliminate the use of solvents (such as NMP, N-methylpyrrolidone), eliminating the need for solvent drying and recycling steps. This makes the manufacturing process simpler, faster, more economical, and more environmentally friendly. While dry electrode technology offers significant advantages, its application in actual production still faces some challenges. Currently, due to material properties, a purely dry cathode process is not yet fully achievable. Therefore, ultra-high solids self-supporting films for cathodes have become a viable solution. A self-supporting film is a thin film material that can exist independently without the need for an additional substrate. For electrode materials, the self-supporting film mainly consists of active materials, conductive agents, and binders. The application of self-supporting films in electrode materials, along with the fabrication of electrode films using current collectors (foils), can improve the energy density and power density of batteries, further enhancing battery performance and cycle life.
[0004] However, during the process of combining the self-supporting membrane with the current collector, the self-supporting membrane is wet and slightly viscous, making it prone to breakage and thus unable to be combined with the current collector. Utility Model Content
[0005] To address the shortcomings of existing technologies, this invention provides a composite device for an ultra-high solids content lithium battery self-supporting membrane and a current collector, which solves the problem of the ultra-high solids content lithium battery self-supporting membrane being wet and highly viscous in the current composite process, and can also prevent the self-supporting membrane from breaking during the composite process.
[0006] This utility model provides a composite device for an ultra-high solids content lithium battery self-supporting membrane and a current collector, comprising:
[0007] Self-supporting film unwinding roller is used to unwind self-supporting film material. The self-supporting film is wound into a roll by separation of release film.
[0008] A current collector unwinding roller is used to unwind the current collector material roll, and the current collector unwinding roller is disposed between the self-supporting film unwinding rollers;
[0009] The release film take-up roller and the self-supporting film unwind roller are respectively arranged and located below the current collector unwind roller, for collecting the release film of the self-supporting film roll;
[0010] Tension sensors are provided one-to-one with the self-supporting film unwinding roller and the current collector unwinding roller to detect the tension of the self-supporting film unwinding roller and the current collector unwinding roller;
[0011] The self-supporting membrane and current collector are output via the output roller;
[0012] A roll forming structure, located behind the output roll, is used to composite the self-supporting membrane and the current collector.
[0013] As can be seen from the above technical solution, the present invention provides a composite device for ultra-high solids content lithium battery self-supporting film and current collector. The self-supporting film is pre-wound into a roll by separating it with a release film. By setting a release film take-up roller, the self-supporting film and the release film are separated when the self-supporting film is unwound, which solves the problem of the self-supporting film being wet and sticky. It also includes a tension sensor to detect the tension of the roll and prevent breakage.
[0014] Optionally, a first guide roller and a second guide roller are respectively provided on both sides of the tension sensor, and the included angle formed by the first guide roller, the second guide roller and the tension sensor is 0°≤α≤150°.
[0015] Optionally, a correction sensor is also provided in the flow direction of the self-supporting film roll and the current collector roll, and the self-supporting film unwinding roller and the current collector unwinding roller are also connected to a correction electric cylinder, and the correction electric cylinder and the correction sensor are electrically connected.
[0016] Optionally, it also includes a roll guide roller, which is disposed between the correction sensor and the tension sensor in the direction of the current collector flow.
[0017] Optionally, it also includes a roll diameter detection mechanism, which is used to detect the roll diameter of the self-supporting film roll and the current collector roll.
[0018] Optionally, a baffle is provided between the self-supporting film unwinding roller and the current collector unwinding roller.
[0019] By adopting the above technical solution, this application has the following technical effects:
[0020] This utility model provides a composite device for ultra-high solids content lithium battery self-supporting film and current collector. The self-supporting film is pre-wound into a roll by separating it with a release film. By setting a release film take-up roller, the self-supporting film and the release film are separated when the self-supporting film is unwound, which solves the problem of the self-supporting film being wet and sticky. It also includes a tension sensor to detect the tension of the roll and prevent breakage. Attached Figure Description
[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0022] Figure 1 This is a front view of the composite device for ultra-high solids content lithium battery self-supporting membrane and current collector provided in an embodiment of the present invention;
[0023] Figure 2 for Figure 1 Left view of the composite device for ultra-high solids content lithium battery self-supporting membrane and current collector shown;
[0024] Figure 3 for Figure 1 The top view of the composite device of ultra-high solids content lithium battery self-supporting membrane and current collector shown.
[0025] Figure label:
[0026] 1-Self-supporting film unwinding roller; 2-Current collector unwinding roller; 3-Release film take-up roller; 4-Tension sensor; 5-Outlet roller; 6-Roll pressing structure; 7-First guide roller; 8-Second guide roller; 9-Correction sensor; 10-Roll passing roller; 11-Roll diameter detection mechanism; 12-Baffle; 13-Correction electric cylinder; 14-Mounting bracket. Detailed Implementation
[0027] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.
[0028] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.
[0029] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 utility model and simplifying the description, and are not intended to 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 of this utility model.
[0030] like Figure 1-3 As shown, this embodiment provides a composite device for ultra-high solids content lithium battery self-supporting film and current collector, including a self-supporting film unwinding roller 1, a current collector unwinding roller 2, a release film take-up roller 3, a tension sensor 4, and an output roller 5. The self-supporting film unwinding roller 1 is used to unwind the self-supporting film roll, and the self-supporting film is wound into a roll by separating it with a release film. The current collector unwinding roller 2 is used to unwind the current collector roll, and the current collector unwinding roller 2 is disposed between the self-supporting film unwinding roller 1. The release film take-up roller 3 is correspondingly disposed with the self-supporting film unwinding roller 1 and is located below the current collector unwinding roller 2, and is used to collect the release film of the self-supporting film roll. The tension sensor 4 is correspondingly disposed with the current collector unwinding roller 2 and the self-supporting film unwinding roller 1, and is used to detect the tension of the self-supporting film unwinding roller 1 and the current collector unwinding roller 2. The self-supporting film and the current collector are output through the output roller 5. A roll pressing structure 6 is disposed behind the output roller 5 and is used to composite the self-supporting film and the current collector.
[0031] In this embodiment, the self-supporting film is pre-wound into a roll by separating it with a release film. By setting a release film take-up roller 3, the self-supporting film and the release film are separated when the self-supporting film is unwound, which solves the problem of the self-supporting film being wet and sticky. This embodiment also includes a tension sensor 4, which detects the tension of the roll to prevent breakage.
[0032] It should be noted that the range requirement of the tension sensor 4 used for self-supporting membrane tension detection is higher than that of the tension sensor 4 used for current collector tension detection, and can be set accordingly in actual production.
[0033] After the self-supporting membrane and current collector are output by the output roller 5, the roll is compounded by the roll pressing structure 6 to achieve preheating and compounding of the self-supporting membrane and current collector.
[0034] See Figure 1 The tension sensor 4 is provided with a first guide roller 7 and a second guide roller 8 on both sides, and the included angle formed by the first guide roller 7, the second guide roller 8 and the tension sensor 4 is 0°≤α≤150°.
[0035] like Figure 1-2As shown, a web guiding sensor 9 is also installed in the flow direction of the self-supporting membrane roll and the current collector roll, and another web guiding sensor 9 is installed in the retention area of the self-supporting membrane roll and the current collector roll. A web guiding electric cylinder 13 is also connected to the self-supporting membrane unwinding roller 1 and the current collector unwinding roller 2. The web guiding electric cylinder and the web guiding sensor 9 are electrically connected. The web guiding sensor 9 detects whether the self-supporting membrane / current collector roll is misaligned in real time, and controls the position of the web guiding electric cylinder 13 based on the feedback, thereby achieving automatic position adjustment of the self-supporting membrane roll / current collector roll to ensure that the flow direction of the self-supporting membrane roll / current collector roll is in a straight line.
[0036] In one embodiment, the correction cylinder 13 is connected to the mounting bracket 14 of the self-supporting film roll and the current collector roll. The correction cylinder 13 adjusts the left and right offset of the mounting bracket 14, thereby adjusting the offset of the film roll.
[0037] It also includes a material roll guide roller 10, which is positioned between the current collector flow direction correction sensor 9 and the tension sensor 4. For example... Figure 1 As shown, in order to adjust the flow direction of the current collector roll, a roll-over roller 10 is also provided so that the current collector flow direction on both sides of the tension sensor 4 and the tension sensor 4 itself can maintain an angle of 0°≤α≤150°, and at the same time maintain the resultant force direction of the tension sensor 4 under the operating conditions.
[0038] Optionally, it also includes a roll diameter detection mechanism 11, which is used to detect the roll diameter of the self-supporting film roll and the current collector roll, so that the roll linear speed is kept uniform.
[0039] Optionally, a baffle 12 is provided between the self-supporting film unwinding roller 1 and the current collector unwinding roller 2. By providing the baffle 12, dust from the self-supporting film is prevented from falling onto the current collector film, thus affecting the lamination effect and accuracy.
[0040] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.
[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model 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 or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.
Claims
1. A composite device for ultra-high solids content lithium battery self-supporting membrane and current collector, characterized in that, include: Self-supporting film unwinding roller is used to unwind self-supporting film material. The self-supporting film is wound into a roll by separation of release film. A current collector unwinding roller is used to unwind the current collector material roll, and the current collector unwinding roller is disposed between the self-supporting film unwinding rollers; The release film take-up roller and the self-supporting film unwind roller are respectively arranged and located below the current collector unwind roller, for collecting the release film of the self-supporting film roll; Tension sensors are provided one-to-one with the self-supporting film unwinding roller and the current collector unwinding roller to detect the tension of the self-supporting film unwinding roller and the current collector unwinding roller; The self-supporting membrane and current collector are output via the output roller; A roll forming structure, located behind the output roll, is used to composite the self-supporting membrane and the current collector.
2. The composite device for ultra-high solids content lithium battery self-supporting membrane and current collector according to claim 1, characterized in that, The tension sensor is provided with a first guide roller and a second guide roller on both sides, and the included angle formed by the first guide roller, the second guide roller and the tension sensor is 0°≤α≤150°.
3. The composite device for ultra-high solids content lithium battery self-supporting membrane and current collector according to claim 2, characterized in that, The self-supporting film roll and the current collector roll are respectively equipped with a deviation correction sensor in their flow direction. The self-supporting film unwinding roller and the current collector unwinding roller are also connected to a deviation correction electric cylinder. The deviation correction electric cylinder and the deviation correction sensor are electrically connected.
4. The composite device for ultra-high solids content lithium battery self-supporting membrane and current collector according to claim 3, characterized in that, It also includes a material roll guide roller, which is disposed between the correction sensor and the tension sensor facing the direction of the current collector flow.
5. The composite device for ultra-high solids content lithium battery self-supporting membrane and current collector according to claim 2, characterized in that, It also includes a roll diameter detection mechanism, which is used to detect the roll diameter of the self-supporting film roll and the current collector roll.
6. The composite device for ultra-high solids content lithium battery self-supporting membrane and current collector according to claim 1, characterized in that, A baffle is provided between the self-supporting film unwinding roller and the current collector unwinding roller.