Dry-method electrode preparation device

Abstract

The utility model relates to the technical field of battery electrode preparation, in particular to a dry method electrode preparation device. A film is formed by rolling through the film forming structure and then is thinned by rolling to form a formed film, after the first formed film is compounded with one side surface of the current collector, single-side surface density detection is carried out through one first surface density detection structure, and then the other side of the current collector is compounded with a second formed film by rolling, so that the electrode is obtained. The electrode performs surface density detection through the second surface density detection structure to improve the detection precision, so that the risk that the surface density exceeds the specification in the manufacturing process is avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a dry electrode manufacturing apparatus. Background Technology

[0002] Electrode film preparation processes include powder coating and binder fibrosis. Because powder coating is prone to component segregation and unevenness, the binder fibrosis method is currently the mainstream approach. The binder fibrosis method involves adding active materials and conductive agent powders to a solid binder, then applying high shear force to fibrose the binder and bond the powder together. The binder is then compacted and thinned through extrusion to form a self-supporting film, which is then rolled and laminated with a current collector to form the electrode. Current electrode film production equipment using the binder fibrosis method has the following problems: Current dry coating equipment tends to simultaneously form, thin, and laminate films on both sides. However, this equipment cannot perform real-time detection of the areal density on a single side; it can only detect the areal density on both sides. In actual manufacturing, there are cases where the areal density on both sides is acceptable, but the areal density on one side is unacceptable. In such cases, double-sided areal density detection cannot detect the defective product, which will affect the subsequent performance of the electrode.

[0003] Therefore, there is an urgent need for a dry electrode fabrication device that can detect the areal density of two surfaces to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a dry electrode preparation device that can detect the surface density of a single side to ensure that the surface density meets the requirements during the manufacturing process.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A dry electrode fabrication apparatus is provided, comprising:

[0007] A film-forming structure, the film-forming structure including a first film-forming component and a second film-forming component, the first film-forming component being used to manufacture a first shaped film sheet, and the second film-forming component being used to manufacture a second shaped film sheet;

[0008] The composite structure includes a first composite region and a second composite region. The first composite region is used to composite a first molded film onto one side of the current collector, and the second composite region is used to composite a second molded film onto the other side of the current collector to form an electrode.

[0009] The first composite region is provided with a first areal density detection structure for detecting the areal density of the first molded film after being combined with the current collector, and the second composite region is provided with a second areal density detection structure for detecting the areal density of the electrode.

[0010] This utility model has at least the following beneficial effects:

[0011] After the powder is fed, it is rolled into a film by a film-forming structure and then rolled thinned into a shaped film. The first shaped film is combined with one side of the current collector, and then the single-sided surface density is detected by one of the first surface density detection structures. Then the other side of the current collector is rolled and combined with the second shaped film to obtain the electrode. The electrode is tested for surface density by the second surface density detection structure to improve the accuracy of the test and avoid the risk of surface density exceeding the specification during the manufacturing process. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the first structure of the dry electrode preparation apparatus provided in an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the second structure of the dry electrode preparation apparatus provided in an embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of the third structure of the dry electrode preparation apparatus provided in an embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of the fourth structure of the dry electrode preparation apparatus provided in this embodiment of the present invention;

[0017] Figure 5 This is a fifth structural schematic diagram of the dry electrode preparation apparatus provided in an embodiment of the present invention.

[0018] In the picture:

[0019] 1. Film-forming structure; 11. First film-forming assembly; 12. Second film-forming assembly; 111. Film-forming roller assembly; 1111. Film-forming roller; 1112. Support roller; 112. Calendering roller; 2. Composite structure; 21. First composite roller; 22. Second composite roller; 3. First areal density detection structure; 4. Second areal density detection structure; 5. Guide roller; 100. Current collector; 200. First forming film; 300. Second forming film; 400. Electrode. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0021] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0024] Because existing dry electrode fabrication devices simultaneously composite the molded films on both sides of the current collector with the current collector, the areal density of the resulting electrode cannot be measured on one side. Therefore, this invention provides a dry electrode fabrication device capable of measuring the areal density of both sides of the electrode.

[0025] For ease of description, the molded membrane includes a first molded membrane 200 and a second molded membrane 300.

[0026] like Figures 1 to 5As shown, the dry electrode fabrication apparatus includes a film-forming structure 1 and a composite structure 2. The film-forming structure 1 is used to manufacture a shaped film and includes a first film-forming component 11 and a second film-forming component 12. The first film-forming component 11 is used to manufacture a first shaped film 200, and the second film-forming component 12 is used to manufacture a second shaped film 300. The composite structure 2 includes a first composite region and a second composite region. The first composite region is used to composite the first shaped film 200 onto one side of the current collector, and the second composite region is used to composite the second shaped film 300 onto the other side of the current collector 100 to form an electrode 400. The first composite region is provided with a first areal density detection structure for detecting the areal density of the first shaped film after being composited with the current collector 100, and the second composite region is provided with a second areal density detection structure for detecting the areal density of the electrode 400.

[0027] After the powder is fed, it is rolled into a film by the film-forming structure 1 and then rolled thinned into a shaped film. The first shaped film 200 is combined with one side of the current collector 100, and then the single-sided surface density is detected by one of the first surface density detection structures 3. Then the other side of the current collector is rolled and combined with the second shaped film 300 to obtain the electrode 400. The electrode 400 is tested for surface density by the second surface density detection structure 4 to improve the accuracy of the test and avoid the risk of surface density exceeding the specification during the manufacturing process.

[0028] The first composite zone contains a first composite component, which is located behind the first film-forming component along the film transport direction. The first composite component is used to composite the first formed film 200 with one side of the current collector 100. Along the film transport direction, the first areal density detection structure 3 is located behind the first composite component. This arrangement ensures that the first areal density detection structure 3 can detect the areal density of the semi-finished film after the first film-forming film and the current collector 100 are composited.

[0029] The first composite zone includes two first composite rollers 21 arranged along the diaphragm transport direction. The two first composite rollers 21 are arranged at intervals to composite the current collector 100 with the first formed diaphragm 200.

[0030] The second composite region contains a second composite assembly located behind the second film-forming assembly along the membrane transport direction. This assembly is used to composite the second formed membrane 300 with the other side of the current collector 100. The second areal density detection structure 4 is located behind the second composite assembly along the membrane transport direction. This arrangement ensures that the second areal density detection structure 4 can detect the areal density of the electrode 400 after the second formed membrane and the current collector 100 are composited.

[0031] The second composite zone includes two second composite rollers 22 arranged along the membrane conveying direction, and two first composite rollers 22 arranged at intervals to composite the other side of the current collector 100 with the second molded membrane 300.

[0032] Of the two first composite rollers 21, one is a fixed roller and the other is a moving roller. Similarly, of the two second composite rollers 22, one is a fixed roller and the other is a moving roller. In this embodiment, the moving roller is defined as one that is fixed on the frame, while the moving roller is one that can be movably mounted on the frame.

[0033] After the first forming film 200 is laminated with one side of the current collector 100, it needs to be transferred to the second lamination zone to be laminated with the second forming film 300. For this purpose, multiple guide rollers 5 are provided between the first lamination zone and the second lamination zone to guide and transport the semi-finished film.

[0034] After the semi-finished film obtained by combining the first forming film 200 and the current collector 100 is transported by the guide roller 5, the film density may change due to tension or the force between the film and the guide roller 5. Moreover, the change in film density is irregular. If the first surface density detection structure 3 is set between the guide roller 5 and the second composite area, the detection result of the first surface density detection structure 3 cannot provide a reference for adjusting the relevant parameters of the film forming structure.

[0035] Therefore, the first areal density detection structure 3 is located between the first composite zone and the guide roller 5. This allows for the acquisition of accurate areal density values, enabling adaptive adjustment of film-forming structure-related parameters to avoid the influence of the aforementioned factors.

[0036] In some embodiments, the first film-forming assembly 11 and the second film-forming assembly 12 both include a film-forming roller assembly 111 and a calendering assembly. Along the film conveying direction, the film-forming roller assembly 111 is disposed in front of the calendering assembly. The film-forming roller assembly 111 is used to calender loose powder into a thick film, while the calendering assembly is used to calender the thick film to thin it to obtain a molded film that can be directly composited with the current collector 100. In this way, the dry powder can be processed by forming and calendering to obtain the first molded film 200 and the second molded film 300.

[0037] Specifically, such as Figures 1 to 5 As shown, the calendering assembly includes multiple calendering rollers 112. Along the direction of the film forming roller assembly 111 toward the composite structure 2 and along the film conveying direction, the gap between adjacent calendering rollers 112 gradually decreases. This arrangement ensures that the formed film can be rolled from thick to thin, and the rotational speed of the calendering rollers 112 gradually increases. In the early stage of roll forming, the initial film thickness of the powder is relatively large and the surface is relatively rough. If the gap is small, the reverse force and friction will be greater, making the calendering rollers 112 more prone to deformation. In the later stage, as the film gradually forms and becomes thinner, the surface becomes smooth, and the gradually decreasing gap helps to ensure the forming quality of the film.

[0038] In some embodiments, such as Figures 2-4 As shown, both the first film-forming assembly 11 and the second film-forming assembly 12 further include at least two support rollers 1112. The two support rollers 1112 are arranged in a row and are used to support the film-forming roller assembly 111. The support rollers 1112 are in contact with the film-forming roller assembly 111. In this way, regardless of whether the film-forming structure 1 is arranged horizontally or vertically, the support rollers 1112 can support the film-forming roller assembly 111, thereby improving the support effect on the film-forming roller assembly 111 and preventing the film-forming roller 1111 from undergoing flexible deformation.

[0039] Furthermore, the diameter of the support roller 1112 is larger than the diameter of the film-forming roller 1111. This ensures that the film-forming roller 1111 can be supported in both the vertical and horizontal directions.

[0040] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A dry electrode preparation apparatus, characterized in that, include: A film-forming structure (1) includes a first film-forming component (11) and a second film-forming component (12), wherein the first film-forming component (11) is used to manufacture a first shaped film (200) and the second film-forming component (12) is used to manufacture a second shaped film (300); The composite structure (2) includes a first composite region and a second composite region. The first composite region is used to composite a first molded film (200) to one side of the current collector (100), and the second composite region is used to composite a second molded film (300) to the other side of the current collector (100) to form an electrode (400). The first composite region is provided with a first surface density detection structure for detecting the surface density of the first molded film and the current collector (100) after being combined. The second composite region is provided with a second surface density detection structure for detecting the surface density of the electrode (400).

2. The dry electrode preparation apparatus according to claim 1, characterized in that, The first composite region has a first composite component. Along the transport direction of the membrane, the first composite component is located behind the first film forming component (11). The first composite component is used to composite the first formed membrane (200) with one side of the current collector. Along the transport direction of the membrane, the first areal density detection structure is located behind the first composite component.

3. The dry electrode preparation apparatus according to claim 2, characterized in that, The first composite zone includes two first composite rollers (21) arranged at intervals.

4. The dry electrode preparation apparatus according to claim 1, characterized in that, The second composite region contains a second composite component. Along the transport direction of the membrane, the second composite component is located behind the second film-forming component (12) and is used to composite the second formed membrane (300) with the other side of the current collector. Along the transport direction of the membrane, the second areal density detection structure is located behind the second composite component.

5. The dry electrode preparation apparatus according to claim 4, characterized in that, The second composite zone includes two spaced-apart second composite rollers (22).

6. The dry electrode preparation apparatus according to any one of claims 1-5, characterized in that, Multiple guide rollers (5) are provided between the first composite zone and the second composite zone.

7. The dry electrode preparation apparatus according to claim 6, characterized in that, The first areal density detection structure (3) is located between the first composite area and the guide roller (5).

8. The dry electrode preparation apparatus according to any one of claims 1-5, characterized in that, The first film-forming assembly (11) and the second film-forming assembly (12) both include a film-forming roller assembly (111) and a calendering assembly. Along the conveying direction of the film, the film-forming roller assembly (111) is disposed in front of the calendering assembly. The film-forming roller assembly (111) is used to roll the powder into a film, and the calendering assembly is used to press the film thin to obtain a first shaped film (200) or a second shaped film (300).

9. The dry electrode preparation apparatus according to claim 8, characterized in that, The calendering assembly includes multiple calendering rollers (112), and the gap between adjacent calendering rollers (112) gradually decreases along the transport direction of the film.

10. The dry electrode preparation apparatus according to claim 8, characterized in that, The first film-forming assembly (11) and the second film-forming assembly (12) each further include at least two support rollers (1112), the support rollers (1112) are arranged in a row, and the support rollers (1112) are used to support the film-forming roller assembly (111), and the support rollers (1112) are in contact with the film-forming roller assembly (111).

Images