Dry electrode manufacturing device

Abstract

A dry electrode manufacturing apparatus comprising at least one rolling component, the rolling component comprising a plurality of rolling rolls (1) for rolling a film, wherein, of any three adjacent rolling rolls (1), the center axes of two edge rolling rolls (1) are arranged on the same plane and the center axis of a middle rolling roll (1) is arranged on one side of the plane; wherein a gap is formed between each pair of adjacent rolling rolls (1), and when the film passes between adjacent rolling rolls (1), the adjacent rolling rolls (1) each abut against the film.

Description

Technical area

[0001] The present utility model relates to the field of battery production and, in particular, to a dry electrode manufacturing apparatus. Background of the invention

[0002] Methods for producing dry electrode films include the powder spray process and the binder fibrillation process. Because the powder spray process is prone to segregation and uneven distribution of components, the binder fibrillation process has become the mainstream approach. In the binder fibrillation process, active material and conductive powder are added to a solid binder. High shear force is then applied to fibrillate the binder, causing the powder to bond. The resulting bonded mass is compacted and thinned by extrusion to form a self-supporting film, which is then rolled into an electrode with a current collector.However, current equipment for producing electrode films using the binder fibrillation process has the following problem: In existing dry coating equipment in the industry, the rollers are arranged in a straight line, which places high pressure on each roller, regardless of whether it is arranged horizontally or vertically, resulting in significant bending deformation.

[0003] Therefore, there is an urgent need for a dry electrode manufacturing apparatus to solve the above technical problems. Brief description

[0004] The object of the present utility model is to provide a dry electrode manufacturing apparatus that can reduce the pressure on each roller and reduce the bending deformation of each roller.

[0005] To achieve this task, the present utility model uses the following technical solution: A dry electrode manufacturing apparatus is provided, comprising at least one rolling component. The rolling component comprises a plurality of rolling rolls for rolling a film. For any three adjacent rolling rolls, the center axes of two edge rolling rolls are arranged in the same plane, while a center axis of the center rolling roll is arranged on one side of the plane. A gap is formed between each pair of adjacent rolling rolls, and as the film passes through these rolling rolls, each of the adjacent rolling rolls bears against the film.

[0006] The present utility model has at least the following advantageous effects: The dry electrode manufacturing apparatus provided by the present invention includes at least a plurality of rolling rolls for rolling a film. For any three adjacent rolling rolls, the center axes of two edge rolling rolls are arranged on the same plane, while the center axis of the center rolling roll is arranged on one side of the plane, i.e., the center axes of the rolling rolls are not completely coplanar. With this arrangement, the lower-positioned rolling roll can provide some support to the higher-positioned rolling roll, thereby reducing the pressure exerted between adjacent rolling rolls and subsequently reducing the bending deformation of some rolling rolls. This structure improves the overall film forming quality and thus increases the quality of the electrode produced from the film. Short description of the drawings

[0007] To better illustrate the technical solutions in the embodiments of the present utility model, the drawings necessary for describing the embodiments of the present utility model are briefly described here as an introduction. It is understood that the drawings described below represent only some embodiments of the present utility model. A person skilled in the art can create additional drawings based on the content of these embodiments and these drawings without any creative effort. Fig. 1 is a first structural schematic view of the dry electrode manufacturing apparatus provided by an embodiment of the present utility model; Fig. 2 is a second structural schematic view of the dry electrode manufacturing apparatus provided by an embodiment of the present utility model; Fig. 3 is a third structural schematic view of the dry electrode manufacturing apparatus provided by an embodiment of the present utility model; Fig. 4 is a fourth structural schematic view of the dry electrode manufacturing apparatus provided by an embodiment of the present utility model. Reference numbers:

[0008] 1 - Rolling roll; 2 - Film forming roll; 3 - Support roll; 4 - Compound roll; 100 - Current collector. Detailed description

[0009] The following is a detailed description of the present utility model in conjunction with the drawings and embodiments. It is understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of the present utility model. Furthermore, to facilitate description, the drawings show only parts of the present design and not the entire structure.

[0010] Unless expressly stated and limited otherwise, the terms "connected," "connection," and "attached" in the description of the present utility model should be interpreted broadly. For example, they may refer to permanent connections or detachable connections or integrated structures; mechanical connections or electrical connections; directly connected or indirectly connected via intermediate elements; internal communication between two elements; or interaction between two elements. Those skilled in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

[0011] In the present utility model, unless expressly stated and limited otherwise, a first feature located "above" or "below" a second feature may include direct contact between the first and second features, and it may also include that the first and second features are not in direct contact but are in contact via other features between them. Furthermore, the first feature "above," "over," and "on" the second feature includes the first feature being directly above and diagonally above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below" and "below" the second feature may indicate that the first feature is directly below and diagonally below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0012] In the description of this embodiment, terms such as "upper," "lower," "right," and other directional or positional relationships are based on the directional or positional relationships shown in the drawings. These terms are used solely for convenience of description and ease of operation. They do not indicate or imply that the device or element in question has a particular orientation or must be constructed or operated in a particular orientation. Therefore, they cannot be considered limitations of the present utility model. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and have no particular meaning.

[0013] The present invention addresses the problem of roll bending deformation caused by compression between adjacent rolls and provides dry electrode manufacturing. This dry electrode manufacturing can change the extent of roll bending deformation and improve the quality of finished electrodes.

[0014] Fig. 1 is a first structural schematic view of the dry electrode manufacturing apparatus provided by an embodiment of the present utility model; Fig. 2 is a second structural schematic view of the dry electrode manufacturing apparatus provided by an embodiment of the present utility model; Fig. 3 is a third structural schematic view of the dry electrode manufacturing apparatus provided by an embodiment of the present utility model; Fig. 4 is a fourth structural schematic view of the dry electrode manufacturing apparatus provided by an embodiment of the present utility model.

[0015] As in the Fig. As shown in Figures 1 to 4, the dry electrode manufacturing apparatus provided by the present invention includes at least one rolling component. The rolling component includes a plurality of rolling rollers (1) for rolling a film. For any three adjacent rolling rollers (1), the center axes of two edge rolling rollers (1) are arranged on the same plane, and the center axis of the middle rolling roller (1) is arranged on one side of the plane.

[0016] Since, for any three adjacent rolling rolls (1), the center axes of the two edge rolling rolls (1) are arranged on the same plane and the center axis of the middle rolling roll (1) is arranged on one side of the plane, that is, the center axes of the rolling rolls (1) are not completely coplanar. With this arrangement, the lower-positioned rolling roll (1) can provide some support to the higher-positioned rolling roll (1), thereby reducing the pressure exerted between adjacent rolling rolls (1) and further reducing the bending deformation of some rolling rolls (1). With such an arrangement, the forming quality of the film as a whole can be improved, and accordingly, the quality of the electrode made from the film can also be improved.

[0017] When the rolling rollers (1) are arranged horizontally, the rolling roller (1) with the higher center axis is supported by the rolling roller (1) with the lower center axis, which can reduce the bending deformation of the rolling roller (1) with the higher center axis. When the rolling rollers (1) are arranged vertically, the force exerted between adjacent rolling rollers (1) decreases accordingly, and from bottom to top, the bending deformation of the rolling rollers (1) decreases overall.

[0018] In some embodiments, the rotational speeds of the rolling rollers (1) exhibit a gradually increasing tendency along with the conveying direction of the film. In the early stage of rolling film formation, the powder first forms a film with a greater thickness and a rougher surface, resulting in higher reaction force and frictional force on the adjacent rolling rollers (1). If the rotational speed is too high, the rolling rollers (1) are more prone to deformation, and the surface is more likely to be damaged. In the later stage, as the film gradually forms and becomes thinner, with a smoother surface, both the reaction force and frictional force on the adjacent rolling rollers (1) decrease accordingly. Consequently, production efficiency can be improved.

[0019] In some embodiments, gaps between adjacent rolling rolls (1) exhibit a decreasing trend along the film rolling direction. In the early stages of rolling film formation, the powder first forms a film with a greater thickness and a rougher surface. When the gap is small, the reaction force and friction force are greater, making the rolling rolls (1) more susceptible to deformation. In the later stages, as the film gradually forms and becomes thinner with a smoother surface, gradually decreasing gaps are beneficial in ensuring the film forming quality.

[0020] For example, all the rolling rolls (1) have the same diameter. When three adjacent rolling rolls (1) are used, if the center rolling roll (1) is supported or pressed down by the edge rolling rolls (1), the compression force it receives is reduced. Accordingly, the bending deformation of some of the rolling rolls (1) is reduced. Overall, the quality of the electrode product obtained by this dry electrode manufacturing device is improved.

[0021] In addition, it should be noted that to ensure minimal deformation of the rolling rolls (1) downstream in the rolling direction of the film, the rolling rolls (1) should be supported by adjacent rolling rolls (1) to improve the quality of film forming.

[0022] For example, the rolling rollers (1) are arranged horizontally. With such an arrangement, the overall bending deformation of the rolling rollers (1) can be reduced, thereby improving the product quality of the film. Of course, in other embodiments, the rolling rollers (1) are arranged in a vertical direction. With such an arrangement, the space occupied by the dry electrode manufacturing device can be reduced. Since the two uppermost rollers (1) are supported, the quality of the film being rolled out from the uppermost rolling roller (1) is also improved accordingly.

[0023] In some embodiments, the dry electrode manufacturing apparatus for forming the powder into a rough starting film further comprises a film forming component having two film forming rollers (2). Along the film rolling direction, i.e., along the film conveying direction, the film forming component is arranged upstream of the rolling component. Thus, the powder is first rolled into a rough film by the film forming rollers (2), and then the rough film is rolled and thinned by the rolling rollers (1) to obtain the finished film. Such an arrangement can improve film manufacturing efficiency and provide automated production.

[0024] In some embodiments, the two film-forming rolls (2) are arranged parallel or offset along the film-rolling direction. Such an arrangement can reduce the force from adjacent rolls to some rolls, thereby reducing the bending deformation of the rolls and improving the quality of film forming.

[0025] In other embodiments, the film forming roll (2) and the adjacent rolling roll (1) are arranged parallel or offset along the film rolling direction. With such an arrangement, the force exerted by adjacent rolls on some rolls can be reduced, thereby reducing the bending deformation of the rolls and improving the quality of film forming.

[0026] For example, in any three adjacent rolls of the film forming rolls (2) and rolling rolls (1), the center axes of two edge rolling rolls are arranged on the same plane, and the center axis of the center roll is located on one side of the plane. The number of film forming rolls (2) is generally two, which can achieve the formation of a rough film. Furthermore, such an arrangement can ensure that at least one of the film forming rolls (2) or rolling rolls (1) is in a supported state, reducing roll deformation and improving the quality of the finished film.

[0027] In addition, for example, the diameter of the film forming rolls (2) is smaller than that of the rolling rolls (1).

[0028] In order to reduce the bending deformation of the edge film forming rolls (2), the dry electrode manufacturing apparatus further comprises, as shown in the Fig. 2 to 3, a support component comprising support rollers (3). The support rollers (3) are configured to support the edge film-forming rollers (2), and the support rollers (3) are each in contact with the film-forming rollers (2). In this way, the support rollers (3) can support the film-forming rollers (2), thereby preventing bending deformation of the edge film-forming rollers (2) and further improving the quality of the finished film.

[0029] For example, the support component comprises at least two support rollers (3) which can simultaneously provide support for the film forming rollers (2), thereby reducing the bending deformation of the film forming rollers (2) and improving the quality of film forming.

[0030] The at least two support rollers (3) are each mounted with one or two film-forming rollers (2). The two film-forming rollers (2) are arranged between the support rollers (3); or one of the two film-forming rollers (2) is arranged on the same side of the support rollers (3) and is mounted with the support rollers (3).

[0031] As in Fig. 2, two support rollers (3) are mounted together, and the film forming rollers (2) adjacent to the support rollers (3) are respectively mounted with the two support rollers (3).

[0032] As in Fig. 3, two support rollers (3) are spaced apart from each other, and two film forming rollers (2) are arranged between the two support rollers (3).

[0033] As in Fig. 4, two support rollers (3) are mounted together to form a support roller group, and the support roller group is spaced from another support roller (3), while two film forming rollers (2) are arranged between the support roller group and the support roller (3).

[0034] It should be noted that in some embodiments, both sides of the current collector (100) must be bonded with films. As shown in the Fig.For this purpose, as shown in Figures 1 to 4, the dry electrode manufacturing apparatus comprises two rolling components. Along the direction of travel and conveyance of the film, each rolling component has a corresponding film-forming component at the front, where the film-forming component rolls the powder into a film, which is gradually thinned and formed by the rolling component. The two rolling components are respectively used to produce a first film and a second film. A bonding component for bonding films to the current collector (100) is arranged between the two rolling components. The bonding component has two bonding film-forming sections, one bonding film-forming section being used to bond the first film to one side of the current collector (100), and the other bonding film-forming section being used to bond the second film to the other side of the current collector (100) to form an electrode sheet.The composite component comprises at least one composite roller (4). Along the film rolling direction, the composite roller (4) is arranged behind the rolling roller (1) and is arranged parallel or offset to the adjacent rolling roller (1). The composite roller (4) is used to bond the film obtained by the rolling roller (1) to the current collector (100) to form an electrode sheet. Such an arrangement can increase electrode manufacturing efficiency and improve plant automation.

[0035] For example, in the composite roll (4) and two rolling rolls (1) adjacent to the front thereof, the center axes of two edge rolling rolls are arranged on the same plane, and the center axis of a center roll is arranged on one side of the plane. Such an arrangement can achieve the purpose of the staggered arrangement between the composite roll (4) and the rolling roll (1). Furthermore, when the rolling direction of the film is horizontal, the center axis of the rolling roll (1) is higher than the center axis of the adjacent composite roll (4). With such an arrangement, the composite roll (4) can support the rolling roll (1), thereby reducing the compression force exerted on the rolling roll (1), thereby reducing the bending deformation of the rolling roll (1), and improving the forming quality of the film.

[0036] The composite component further comprises a guide roller used to guide the current collector (100) which is bonded to a film on one side.

[0037] Accordingly, the support components are provided in one-to-one correspondence with the film forming components to achieve the purpose of supporting various film forming components. The number of support rollers (3) in the support components is not completely equal.

[0038] Furthermore, the above embodiments are merely a preferred embodiment of the present utility model and its applied technical principles. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments described herein. Various obvious changes, adaptations, and substitutions can be made to those skilled in the art without departing from the scope of the present utility model. Therefore, although the present utility model has been described in more detail by the above embodiments, it is not limited to only the above embodiments. Under the premise of not departing from the concept of the present utility model, other equivalent embodiments may also be included, and the scope of the present utility model is defined by the scope of the appended claims.

Claims

[1] A dry electrode manufacturing apparatus comprising at least one rolling component, the rolling component comprising a plurality of rolling rolls (1) for rolling a film, wherein, of any three adjacent rolling rolls (1), the center axes of two edge rolling rolls (1) are arranged on the same plane and the center axis of a middle rolling roll (1) is arranged on one side of the plane; wherein a gap is formed between each pair of adjacent rolling rolls (1), and when the film passes between adjacent rolling rolls (1), the adjacent rolling rolls (1) respectively abut against the film. [2] The dry electrode manufacturing apparatus according to claim 1, wherein along a rolling direction of the film, the rotational speeds of the rolling rollers (1) gradually increase. [3] The dry electrode manufacturing apparatus according to claim 1 or 2, wherein the gaps between adjacent rolling rolls (1) gradually decrease along the rolling direction of the film. [4] The dry electrode manufacturing apparatus according to any one of claims 1 to 3, wherein the rolling rollers (1) are arranged in a horizontal direction; or the rolling rollers (1) are arranged in a vertical direction. [5] The dry electrode manufacturing apparatus according to any one of claims 1 to 4, further comprising a film forming component, wherein the film forming component has two film forming rollers (2), and along the rolling direction of the film, the film forming component is arranged in front of the rolling component. [6] The dry electrode manufacturing apparatus according to claim 5, wherein the two film forming rollers (2) are arranged in parallel or staggered along the rolling direction of the film. [7] The dry electrode manufacturing apparatus according to claim 6, wherein along the rolling direction of the film, the film forming roll (2) and the adjacent rolling roll (1) are arranged in parallel or offset. [8] The dry electrode manufacturing apparatus according to claim 5, further comprising a support component, wherein the support component comprises a support roller (3), and the support roller (3) is configured to support the edge film forming roller (2). [9] The dry electrode manufacturing apparatus according to claim 8, wherein the support component comprises at least two support rollers (3), the at least two support rollers (3) being each attached to one or two film forming rollers (2). [10] A dry electrode manufacturing apparatus according to any one of the preceding claims, wherein the apparatus comprises two rolling components each configured to produce a first film and a second film; wherein a composite component for bonding the film and a current collector (100) is disposed between the two rolling components, and the composite component has two composite film forming sections, one of which is configured to bond the first film to one side of the current collector (100) and the other of which is configured to bond the second film to another side of the current collector (100) to form an electrode sheet. [11] The dry electrode manufacturing apparatus according to claim 10, wherein the composite film forming section comprises at least one composite roll (4), and along the rolling direction of the film, the composite roll (4) is arranged behind the adjacent rolling roll (1) and is arranged parallel to or offset from the adjacent rolling roll (1).

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