Battery pole piece dry method roll pressing composite equipment

Abstract

The utility model provides a kind of battery pole piece dry method roll compound equipment, including forming roller group, thinning roller group, first driving part and second driving part, forming roller group has multiple forming rollers along the first direction arrangement, and there is first roll gap between adjacent forming rollers;Thinning roller group has multiple thinning rollers along the first direction arrangement, and there is second roll gap between adjacent thinning rollers, forming roller group and thinning roller group are arranged along second direction, first direction and second direction are arranged at angle, raw material is calendered into material by first roll gap and is calendered and thinned by second roll gap;First driving part is drivenly connected with forming roller group, and first calendering force is applied to the material at first roll gap;Second driving part is independently arranged relative to second driving part, second driving part is drivenly connected with thinning roller group, and second calendering force is applied to the material at second roll gap.The utility model solves the problem that the forming pressure and the thinning pressure of the battery pole piece in the prior art cannot be independently adjusted.

Description

Technical Field

[0001] This utility model relates to the field of battery electrode processing technology, and more specifically, to a dry roll forming composite equipment for battery electrodes. Background Technology

[0002] With advancements in lithium-ion battery production technology, particularly the demands of solid-state battery processes, dry roll forming technology is increasingly favored by lithium battery manufacturers. Compared to traditional wet coating technology, dry coating offers the following advantages: the produced electrodes are completely solvent-free, significantly improving battery performance; no drying oven is required, resulting in lower equipment costs and a smaller footprint, especially for high-speed coating machines, where its advantages are even more pronounced.

[0003] However, current dry-process equipment cannot fully meet the production process requirements of lithium batteries, especially solid-state batteries, which have even stricter requirements for dry-process electrodes. Specifically, the film-forming pressure, thinning pressure, and composite pressure of the electrode are usually different. To produce high-density electrodes, the forming pressure should not be too high, while the thinning pressure needs to be 3 to 5 times higher than the forming pressure to meet the process requirements. However, existing dry-process equipment cannot meet the high-density requirements by independently controlling the film-forming pressure and the thinning pressure. Utility Model Content

[0004] The main purpose of this invention is to provide a dry roll forming composite equipment for battery electrodes to solve the problem that the forming pressure and thinning pressure of battery electrodes in the prior art cannot be independently adjusted.

[0005] To achieve the above objectives, according to one aspect of the present invention, a dry roll forming composite device for battery electrodes is provided, comprising a forming roller group, a thinning roller group, a first driving member, and a second driving member. The forming roller group has multiple forming rollers arranged along a first direction, with a first roller gap between adjacent forming rollers, and the raw material is calendered into a sheet-like material through the first roller gap. The thinning roller group has multiple thinning rollers arranged along the first direction, with a second roller gap between adjacent thinning rollers. The forming roller group and the thinning roller group are arranged along a second direction, with the first and second directions at an angle, and the material is calendered and thinned through the second roller gap. The first driving member is drivenly connected to the forming roller group and applies a first calendering force to the material at the first roller gap. The second driving member is independently arranged relative to the first driving member, and is drivenly connected to the thinning roller group, applying a second calendering force to the material at the second roller gap.

[0006] Furthermore, the first driving member is located on one side of the forming roller group, the second driving member is located on one side of the thinning roller group, and the first driving member and the second driving member are arranged along the second direction.

[0007] Furthermore, multiple first and second roll gaps are provided, the thinning roll group is located below the forming roll group, and at least one second roll gap is located directly below one of the first roll gaps, so that the material falls to the second roll gap after passing through the first roll gap.

[0008] Furthermore, there are multiple forming roller groups arranged in pairs, with the forming roller groups arranged along a first direction. The pairs of forming roller groups are spaced apart, and a central area is formed between two adjacent forming roller groups. Along the direction close to the central area, the material passes through each first roller gap in the forming roller group in sequence.

[0009] Furthermore, the dry roll forming composite equipment for battery electrodes also includes a transition roller, which is located between the forming roller group and the thinning roller group. The material passes through the forming roller group, the transition roller, and the thinning roller group in sequence.

[0010] Furthermore, at least one forming roll and at least one thinning roll are located on opposite sides of the transition roll, with a first transition roll gap between the transition roll and the forming roll group, and a second transition roll gap between the transition roll and the thinning roll group.

[0011] Furthermore, there are multiple first driving components, and each forming roller group is driven and connected to the first driving component.

[0012] Furthermore, the thinning roller assembly also includes multiple composite rollers, which are arranged along the first direction with the thinning rollers. A third roller gap is formed between adjacent composite rollers. The material passes through the second roller gap and the third roller gap in sequence and is composited at the third roller gap.

[0013] Furthermore, the third roll gap is located directly below the central area.

[0014] Furthermore, the thinning roller group is symmetrically arranged, and thinning rollers are provided at both ends of the integral structure formed by all composite rollers along the first direction.

[0015] Furthermore, the dry roll forming composite equipment for battery electrodes also includes a pass roller, at least one pass roller is located in the central area or directly above the central area, the pass roller conveys the substrate to the third roll gap, and the composite roller simultaneously presses multiple materials conveyed from the second roll gap to the third roll gap onto both sides of the substrate to form a dry electrode product.

[0016] Furthermore, there are multiple second driving members, and both ends of the thinning roll group along the first direction are driven and connected to the second driving members. The second driving members located at both ends of the thinning roll group apply a rolling force in the opposite direction to the second roll gap.

[0017] By applying the technical solution of this utility model, forming rollers and thinning rollers are set up separately, and a first driving member drives the forming rollers and a second driving member drives the thinning rollers. This allows for independent control of the force exerted on the material at the first and second roller gaps, providing optimal first and second rolling forces. This facilitates the production of high-compaction-density battery electrodes, thereby improving the quality of the battery electrodes. Specifically, in this embodiment, the first driving member drives the forming rollers, causing the powdered material to form a sheet under the first rolling force at the first roller gap. The second driving member drives the thinning rollers, causing the material to thin under the second rolling force at the second roller gap. Thus, the forces exerted on the material during rolling at the first roller gap and during thinning at the second roller gap can be independently and flexibly adjusted. This ensures that the forces exerted on the material during forming and thinning differ, thereby improving the compaction density of the battery electrodes and ultimately enhancing their quality. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the structure of the dry roll forming composite equipment for battery electrodes according to Embodiment 1 of this utility model is shown.

[0020] Figure 2 A schematic diagram of the structure of the dry roll forming composite equipment for battery electrodes according to Embodiment 2 of this utility model is shown.

[0021] The above figures include the following reference numerals:

[0022] 10. Forming roller assembly; 11. Forming roller; 20. Thinning roller assembly; 21. Thinning roller; 22. Composite roller; 30. First drive component; 40. Second drive component; 50. Transition roller; 60. Feeding component; 70. Material; 80. Transition roller; 90. Raw material; 100. Substrate. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0026] To address the problem that the forming pressure and thinning pressure of battery electrodes cannot be independently adjusted in existing technologies, this invention provides a dry roll forming composite equipment for battery electrodes.

[0027] Example 1

[0028] like Figure 1 The battery electrode dry roll forming composite equipment shown includes a forming roll group 10, a thinning roll group 20, a first drive member 30, and a second drive member 40. The forming roll group 10 has a plurality of forming rolls 11 arranged along a first direction, with a first roll gap between adjacent forming rolls 11. Raw material 90 is rolled into a sheet material 70 through the first roll gap. The thinning roll group 20 has a plurality of thinning rolls 21 arranged along the first direction, with a second roll gap between adjacent thinning rolls 21. The forming roll group 10 and the thinning roll group 20 are arranged along a second direction, with the first and second directions at an angle. The material 70 is rolled and thinned through the second roll gap. The first drive member 30 is drivenly connected to the forming roll group 10 and applies a first rolling force to the material 70 at the first roll gap. The second drive member 40 is independently arranged relative to the forming roll group 10 and is drivenly connected to the thinning roll group 20, applying a second rolling force to the material 70 at the second roll gap.

[0029] In this embodiment, by separately setting up a forming roller group 10 and a thinning roller group 20, and setting up a first driving member 30 to drive the forming roller group 10 and a second driving member 40 to drive the thinning roller group 20, the magnitude of the force on the material 70 at the first roller gap and the second roller gap can be controlled respectively. This provides the material 70 with the optimal magnitude of the first rolling force and the optimal magnitude of the second rolling force, which is beneficial to obtaining a high compaction density battery electrode sheet and thus improving the quality of the battery electrode sheet. Specifically, in this embodiment, the first driving member 30 drives the forming roller group 10, so that the powdered raw material 90 is subjected to a first rolling force at the first roller gap to form a sheet material 70. The second driving member 40 drives the thinning roller group 20, so that the material 70 is subjected to a second rolling force at the second roller gap to thin it. In this way, the magnitude of the force on the raw material 90 when it is rolled at the first roller gap and the force on it when it is thinned at the second roller gap can be adjusted independently and flexibly, so that the force on the raw material 90 when it is formed is different from the force on the material 70 when it is thinned, which is beneficial to improve the compaction density of the battery electrode sheet and thus improve the quality of the battery electrode sheet.

[0030] In this embodiment, the dry roll forming composite equipment for battery electrodes also includes a frame. The forming roller group 10, the thinning roller group 20, the first drive component 30, and the second drive component 40 are all connected to the frame. The forming roller 11 and the thinning roller 21 are rotatably arranged relative to the frame. The first roller gap can be adjusted in size under the action of the first drive component 30, thereby adjusting the magnitude of the first rolling force applied to the material 70. The second roller gap can be adjusted in size under the action of the second drive component 40, thereby adjusting the magnitude of the second rolling force applied to the material 70. Optionally, the first drive component 30 and the second drive component 40 can be hydraulic cylinders to ensure that the first and second rolling forces are sufficiently large, thereby achieving the forming and thinning of the material 70. Of course, depending on the actual situation, the first drive component 30 and the second drive component 40 can also be other drive components such as pneumatic cylinders or electric cylinders.

[0031] To shorten the force transmission path, save space in the dry roll forming composite equipment for battery electrodes, and improve the compactness of the equipment structure, the first drive component 30 is located on one side of the forming roller group 10, and the second drive component 40 is located on one side of the thinning roller group 20. The first drive component 30 and the second drive component 40 are arranged along the second direction, so that the first drive component 30 and the forming roller group 10 are arranged along the first direction, and the second drive component 40 and the thinning roller group 20 are arranged along the first direction. The first drive component 30 and the second drive component 40 can be set to be located on the same side of the forming roller group 10 and the thinning roller group 20, which facilitates the management and maintenance of the first drive component 30 and the second drive component 40.

[0032] It should be noted that, considering reducing the space occupied by the dry roll forming composite equipment for battery electrodes, ensuring equipment stability, and facilitating the transfer of material 70 between the forming roller group 10 and the thinning roller group 20, as follows... Figure 1 As shown, in this embodiment, the first direction is set to a horizontal direction, and the second direction is set to a vertical direction, with the first and second directions perpendicular to each other. Of course, the first and second directions can be adjusted according to the actual situation.

[0033] In this embodiment, multiple first and second roll gaps are provided. The thinning roll group 20 is located below the forming roll group 10, and at least one second roll gap is located directly below one of the first roll gaps. This allows the material 70 to fall from the first roll gap to the second roll gap, thereby simplifying the transfer process of the material 70 between the forming roll group 10 and the thinning roll group 20 and reducing unexpected failures during the transfer process. Specifically, as... Figure 1As shown, the forming roller group 10 of this embodiment is provided with four forming rollers 11, forming three first roller gaps arranged sequentially along a first direction. The raw material 90 enters from the first roller gap near the first driving member and is rolled into a sheet-like material 70. The material 70 passes through the next two first roller gaps in sequence and falls to the second roller gap at the first roller gap away from the first driving member 30. The second roller gap in the thinning roller group 20 near the second driving member 40 is located directly below the first roller gap in the forming roller group 10 away from the first driving member 30, so that the material 70 can enter the second roller gap after passing through each first roller gap in sequence, so that each first roller gap of the forming roller group 10 can act on the material 70. Preferably, when the material 70 leaves the first roller gap and falls to the second roller gap, the material 70 is set to fall vertically to the second roller gap, so that the material 70 can directly complete the position change from the forming roller group 10 to the thinning roller group 20 by gravity, without the need for other power, which is beneficial to simplifying the structure of the dry rolling composite equipment for battery electrodes. Of course, the number of forming rollers 11 and thinning rollers 21 can be adjusted according to the actual situation. For example, according to the process requirements, the number of forming rollers 11 can be increased, thereby increasing the number of first roller gaps to ensure the forming quality of material 70. Alternatively, the number of thinning rollers 21 can be increased, thereby increasing the number of second roller gaps to ensure that material 70 can be gradually thinned to the process requirements.

[0034] In this embodiment, multiple forming roller groups 10 are arranged in pairs, with the forming roller groups 10 arranged along a first direction. The pairs of forming roller groups 10 are spaced apart, and a central region is formed between two adjacent forming roller groups 10. Along the direction close to the central region, the material 70 passes through each of the first roller gaps in the forming roller group 10 in sequence, thereby enabling the dry rolling composite equipment for battery electrodes to process multiple materials 70 at one time, which helps to improve work efficiency. Specifically, this embodiment has a pair of forming roller groups 10, which are symmetrically arranged. The first driving member 30 is located on the side of the two forming roller groups 10 that is far apart from each other, thereby freeing up the working area of ​​the forming roller groups 10 and avoiding interference with the movement of the material 70. In this way, the raw materials 90 from the two locations enter the first roller gap from the side of the forming roller group 10 that is far apart from each other, and then move towards the direction close to the central region, passing through each of the first roller gaps in sequence. The raw materials 90 from the two locations are respectively rolled into material 70 and shaped into thin sheets, and then leave the forming roller group 10 and enter the thinning roller group 20. Multiple sets of forming rollers 10 can be set according to actual needs, thereby improving the production efficiency of battery electrode sheets and enabling large-scale production.

[0035] In this embodiment, there are multiple first driving members 30, and each forming roller group 10 is driven and connected to a first driving member 30. That is, each forming roller group 10 is connected to a separate first driving member 30, so that the force on the forming roller group 10 can be adjusted individually. Depending on the type of material 70, the first rolling force applied to the corresponding forming roller group 10 by the first driving member 30 driven and connected to different forming roller groups 10 can be the same or different. It can be adjusted according to actual needs, thereby improving the flexibility of the forming roller group 10 in processing material 70. This allows the first driving member 30 to adjust the magnitude of the first rolling force in a targeted manner according to actual needs, which is beneficial to improving the processing quality of battery electrode sheets.

[0036] In this embodiment, the thinning roller assembly 20 further includes multiple composite rollers 22. The composite rollers 22 and the thinning rollers 21 are arranged along a first direction, and a third roller gap is formed between adjacent composite rollers 22. The material 70 passes through the second roller gap and the third roller gap in sequence, and is composited at the third roller gap, thereby enabling multiple materials 70 to be composited at the third roller gap. Specifically, this embodiment has two composite rollers 22, and a third roller gap is formed between the two composite rollers 22. After the material 70 is thinned through the second roller gap, it moves to the third roller gap, where it can be composited with other thinned materials 70 or other materials such as the substrate 100 conveyed by other moving parts at the third roller gap to form the final state of the battery electrode sheet, thereby improving the processing efficiency of the battery electrode sheet.

[0037] In this embodiment, the third roll gap is located directly below the central region, thereby providing space for the substrate 100 and other materials to pass through. This allows the substrate 100 and other materials to enter the third roll gap through the central region and combine with the thinned material 70. In this way, the thinned material 70 moves from the second roll gap to the third roll gap and can combine with the substrate 100 and other materials transported from the central region at the third roll gap, thereby obtaining the final state of the dry-process battery electrode product.

[0038] In this embodiment, the thinning roller group 20 is symmetrically arranged. Along the first direction, thinning rollers 21 are provided at both ends of the integral structure formed by all composite rollers 22, so that multiple materials 70 can be composited at the third roller gap. Specifically, in this embodiment, the forming roller group 10 and the thinning roller group 20 are arranged in two stacked rows. The upper row consists of two symmetrically arranged forming roller groups 10, and the lower row consists of thinning roller groups 20. Both ends of the thinning roller group 20 are thinning rollers 21, thus forming a second roller gap. A composite roller 22 is provided at the center of the thinning roller group 20. In this way, two materials 70 can move from the second roller gap at both ends to the second roller gap closer to the third roller gap, and finally be composited at the third roller gap. This allows two materials 70 to move from the ends of the thinning roller group 20 to the center for composite, thereby achieving a natural connection from the thinning process to the composite process without the need for other components for connection. At the same time, it is convenient to set up the first driving member 30 and the second driving member 40 to independently control the rolling force of the forming roller group 10 and the thinning roller group 20.

[0039] In this embodiment, the dry roll forming composite equipment for battery electrodes also includes a guide roller 50. At least one guide roller 50 is located in or directly above the central region. The guide roller 50 conveys the substrate 100 to the third roll gap. The composite roller 22 simultaneously presses multiple materials 70 conveyed from the second roll gap to the third roll gap onto both sides of the substrate 100 to form a dry electrode product. This reasonable layout allows the various components constituting the battery electrode to be conveyed independently from both ends of the thinning roller group 20 and from the guide roller 50 to the third roll gap, without interfering with other components. Specifically, the guide roller 50 is configured as a columnar roller to guide the conveying direction of the substrate 100. The guide roller 50 can be positioned directly above the central region, with one side of the guide roller 50 vertically aligned with the third roll gap, allowing the substrate 100 to enter vertically into the third roll gap after passing through the guide roller 50 and to be composited with the two materials 70 conveyed from both ends of the thinning roller group 20. Optionally, a guide roller 50 can also be provided below the third roller gap to guide the composite battery electrode to change its direction of movement and move smoothly to the next process.

[0040] In this embodiment, there are multiple second driving members 40. Both ends of the thinning roller group 20 along the first direction are driven and connected to the second driving members 40. The second driving members 40 located at both ends of the thinning roller group 20 apply a rolling force in the opposite direction to the second roll gap, thereby ensuring that the material 70 can receive sufficient second rolling force within the second roll gap, thus ensuring the thinning effect of the material 70, and ensuring that the material 70 can receive sufficient pressure within the third roll gap, thus ensuring the composite effect of multiple materials 70. The thinning roller group 20 in this embodiment includes four thinning rollers 21 and two composite rollers 22. The two composite rollers 22 are located at the center of the thinning roller group 20. The four thinning roller groups 20 are divided into two groups, symmetrically arranged on both sides of the composite rollers 22. The second driving members 40 at both ends of the thinning roller group 20 are directly driven and connected to the thinning rollers 21, thereby enabling the material 70 to be thinned under force at the second roll gap and to be composited under force at the third roll gap. The number of thinning rollers 21 is not limited to this and can be adjusted according to actual conditions. It should be noted that there is also a second roll gap between the adjacent thinning roller 21 and composite roller 22, in order to improve the thinning effect of the thinning roller group 20 and obtain high-density battery electrode sheets.

[0041] The dry roll forming composite equipment for battery electrode sheets in this embodiment also includes a feeding component 60. The feeding component 60 can be configured as a funnel and located directly above the first roll gap, so that the powdered raw material 90 of the feeding component 60 can directly fall into the first roll gap for calendering. The position of the feeding component 60 can be adjusted according to the actual calendering effect required. For example, when it is necessary to form and shape the sheet multiple times, the feeding component 60 can be set to be located at the first roll gap away from the central area.

[0042] It should be noted that in this embodiment, both material 70 and substrate 100 are components of the battery electrode sheet. Substrate 100 can refer to a metal substrate or a substrate made of other materials. In this embodiment, the two materials 70, conveyed to the third roll gap by the thinning rollers at both ends of the integral structure formed by all composite rollers 22, are combined with the substrate 100 at the third roll gap. That is, the two materials 70 are respectively conveyed to the two sides of the substrate 100 and pressed onto the two sides of the substrate 100 at the third roll gap to form a dry-process electrode sheet product. Figure 1 The arrows in the diagram indicate the direction of movement of the substrate 100.

[0043] In this embodiment, the material 70 is a powdered raw material 90 in the feeding part 60. It falls from the feeding part 60 to the first roll gap, and then, under the action of the first rolling force of the first driving part 30, it is pressed to form a continuous sheet of a certain thickness. As the forming roller 11 rotates, the sheet passes through each of the first roll gaps in the forming roller group 10 in sequence. Under the action of the first rolling force, the sheet continues to be shaped and thinned. Then, the sheet falls vertically into the second roll gap below for thinning. It passes through each of the second roll gaps in sequence. Under the action of the second rolling force of the second driving part 40, it undergoes multi-stage thinning, gradually thinning the sheet to the process thickness. Battery electrode sheets typically consist of two thin sheets and a metal substrate. Therefore, in this embodiment, two forming roller groups 10 are symmetrically arranged, and thinning rollers 21 are provided on both sides of the overall structure formed by all composite rollers 22, forming a second roller gap. This allows for simultaneous rolling and thinning of the two thin sheets. Then, the two thin sheets and the metal substrate conveyed from the central region are simultaneously composited at the third roller gap. Under the action of the two composite rollers, the two thinned sheets are pressed onto both sides of the metal substrate, thereby forming the battery electrode sheets required for lithium battery production.

[0044] Example 2

[0045] Unlike Embodiment 1, this embodiment provides a transition roller 80 between the forming roller group 10 and the thinning roller group 20 to connect the forming roller group 10 and the thinning roller group 20, so that the material 70 can pass through the transition roller 80 to the thinning roller group 20 for thinning after being calendered from the forming roller group 10.

[0046] like Figure 2 As shown, in this embodiment, the dry roll forming composite equipment for battery electrodes also includes a transition roller 80. The transition roller 80 is located between the forming roller group 10 and the thinning roller group 20. The material 70 passes sequentially around the forming roller group 10, the transition roller 80, and the thinning roller group 20, thereby ensuring that the material 70 is continuously supported throughout the entire conveying process, thus guaranteeing the processing quality of the battery electrodes. Specifically, in this embodiment, the transition roller 80 is located below the forming roller group 10 and above the thinning roller group 20. The material 70 passes sequentially around each forming roller 11, the transition roller 80, and each thinning roller 21, thereby ensuring that the material 70 is continuously and fully supported during the process of being conveyed from the forming roller group 10 to the thinning roller group 20, preventing tearing, breakage, or other damage to the material 70.

[0047] In this embodiment, at least one forming roller 11 and at least one thinning roller 21 are located on opposite sides of the transition roller 80. A first transition gap exists between the transition roller 80 and the forming roller group 10, and a second transition gap exists between the transition roller 80 and the thinning roller group 20, thereby achieving a smooth and reliable transition of the material 70. Specifically, along the conveying direction of the material 70, the forming roller 11 located at the end of the forming roller group 10, i.e., the forming roller 11 near the center region, is the end forming roller; the thinning roller 21 located at the front end of the thinning roller group 20, i.e., the thinning roller 21 far from the center region, is the front thinning roller. In this embodiment, the end forming roller, transition roller 80, and front thinning roller are arranged sequentially from top to bottom, so that the forming roller group 10, transition roller 80, and thinning roller group 20 form a Z-shaped arrangement. In this way, the material 70 passes through the end forming roller, transition roller 80, and front thinning roller in sequence, that is, it passes through the first transition roller gap and the second transition roller gap in sequence. This allows the material to complete the switch from the forming roller group 10 to the thinning roller group 20 when passing through the transition roller 80, thereby avoiding tearing, wrinkling, etc. of the material 70 during vertical falling.

[0048] In this embodiment, when multiple forming roller groups 10 are provided, multiple transition rollers 80 are also provided accordingly, thereby completing the transition of multiple materials 70 from the forming roller group 10 to the thinning roller group 20.

[0049] Preferably, the dry roll forming composite equipment for battery electrodes in this embodiment further includes a heating element, which heats and controls the temperature of the forming roller group 10, the thinning roller group 20, and the transition roller 80, so that the material 70 can be continuously and uniformly heated during the forming process.

[0050] It should be noted that, Figure 2 The arrows in the diagram indicate the direction of movement of the substrate 100.

[0051] It should be noted that "multiple" in the above embodiments refers to at least two.

[0052] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0053] 1. This solves the problem that the forming pressure and thinning pressure of battery electrodes cannot be independently adjusted in existing technologies;

[0054] 2. By setting up a forming roller group and a thinning roller group respectively, and setting up a first driving member to drive the forming roller group and a second driving member to drive the thinning roller group, the force on the material at the first roller gap and the second roller gap can be controlled separately, thereby providing the material with the optimal first rolling force and the optimal second rolling force, which is beneficial to obtaining high compaction density battery electrode sheets and thus improving the quality of battery electrode sheets.

[0055] 3. In this embodiment, the first driving member drives the forming roller group, so that the powdered raw material is formed into a thin sheet by the first rolling force at the first roller gap. The second driving member drives the thinning roller group, so that the material is thinned by the second rolling force at the second roller gap. In this way, the magnitude of the force on the material when it is rolled and formed at the first roller gap and the force on it when it is thinned at the second roller gap can be independently and flexibly adjusted, so that the force on the material during forming is different from the force during thinning, which is beneficial to improving the compaction density of the battery electrode sheet and thus improving the quality of the battery electrode sheet.

[0056] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0057] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0059] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dry roll forming composite equipment for battery electrodes, characterized in that, include: A forming roller group (10) has a plurality of forming rollers (11) arranged along a first direction, and a first roller gap is provided between adjacent forming rollers (11). The raw material (90) is calendered into a sheet material (70) through the first roller gap. Thinning roller group (20), the thinning roller group (20) has a plurality of thinning rollers (21) arranged along the first direction, and a second roller gap is provided between adjacent thinning rollers (21). The forming roller group (10) and the thinning roller group (20) are arranged along the second direction. The first direction and the second direction are set at an angle. The material (70) is calendered and thinned through the second roller gap. The first driving member (30) is driven to be connected to the forming roller group (10) and applies a first rolling force to the material (70) at the first roller gap; The second drive member (40) is independently set relative to the second drive member (40), and the second drive member (40) is driven connected to the thinning roller group (20) and applies a second rolling force to the material (70) at the second roll gap.

2. The dry roll forming composite equipment for battery electrodes according to claim 1, characterized in that, The first driving member (30) is located on one side of the forming roller group (10), the second driving member (40) is located on one side of the thinning roller group (20), and the first driving member (30) and the second driving member (40) are arranged along the second direction.

3. The dry roll forming composite equipment for battery electrodes according to claim 1, characterized in that, Multiple first and second roll gaps are provided. The thinning roll group (20) is located below the forming roll group (10), and at least one second roll gap is located directly below one of the first roll gaps, so that the material (70) falls to the second roll gap after passing through the first roll gap.

4. The dry roll forming composite equipment for battery electrodes according to claim 1, characterized in that, The forming roller group (10) is multiple and arranged in pairs. The forming roller group (10) is arranged along the first direction. The pairs of forming roller groups (10) are spaced apart and a central area is formed between two adjacent forming roller groups (10). Along the direction close to the central area, the material (70) passes through each of the first roller gaps in the forming roller group (10) in sequence.

5. The dry roll forming composite equipment for battery electrodes according to claim 1, characterized in that, The dry roll forming composite equipment for battery electrodes also includes a transition roller (80), which is located between the forming roller group (10) and the thinning roller group (20). The material (70) passes through the forming roller group (10), the transition roller (80) and the thinning roller group (20) in sequence.

6. The dry roll forming composite equipment for battery electrodes according to claim 5, characterized in that, At least one forming roller (11) and at least one thinning roller (21) are located on opposite sides of the transition roller (80), with a first transition roller gap between the transition roller (80) and the forming roller group (10), and a second transition roller gap between the transition roller (80) and the thinning roller group (20).

7. The dry roll forming composite equipment for battery electrodes according to claim 4, characterized in that, There are multiple first driving members (30), and each of the forming roller groups (10) is driven connected to the first driving member (30). There are multiple second driving members (40), and both ends of the thinning roller group (20) along the first direction are driven connected to the second driving member (40). The second driving members (40) located at both ends of the thinning roller group (20) apply a rolling force in the opposite direction to the second roll gap.

8. The dry roll forming composite equipment for battery electrodes according to claim 4, characterized in that, The thinning roller group (20) also includes multiple composite rollers (22), which are arranged along the first direction with the thinning roller (21). A third roller gap is formed between adjacent composite rollers (22). The material (70) passes through the second roller gap and the third roller gap in sequence and is composited at the third roller gap.

9. The dry roll forming composite equipment for battery electrodes according to claim 8, characterized in that, The third roll gap is located directly below the central region.

10. The dry roll forming composite equipment for battery electrodes according to claim 8, characterized in that, The thinning roller group (20) is symmetrically arranged, and along the first direction, the thinning roller (21) is provided at both ends of the integral structure formed by all the composite rollers (22).

11. The dry roll forming composite equipment for battery electrodes according to claim 10, characterized in that, The dry roll forming equipment for battery electrode sheets also includes a pass roller (50), at least one of the pass rollers (50) being located at or directly above the central region. The pass roller (50) conveys the substrate (100) to the third roll gap, and the composite roller (22) simultaneously presses multiple materials (70) conveyed from the second roll gap to the third roll gap onto both sides of the substrate (100) to form a dry electrode sheet product.

Images