Press roller, roller press and battery pole piece manufacturing system

Abstract

The utility model relates to a compression roller, a roller press and a battery pole piece manufacturing system, and belongs to the technical field of battery production, the compression roller comprises an inner roller and an outer roller, the outer roller is rotatably sleeved with the inner roller in a sealed mode, a plurality of hydraulic flow channels are formed in the inner roller, a plurality of hydraulic cavities are formed in the outer roller, and in the rotating process of the outer roller, the hydraulic flow channels are communicated with the hydraulic cavities. Part of the hydraulic cavities can communicate with different hydraulic flow channels, and part of the hydraulic cavities are blocked by the peripheral face of the inner roller, so that the hydraulic cavities have different pressures. According to the compression roller, the roller press and the battery pole piece manufacturing system provided by the invention, the compression roller controls the pressure value in each hydraulic chamber according to the actual working condition and compensates the deflection generated in the rolling process of the compression roller, so that the compression roller is not easy to bend, the ratio of the length to the diameter of the compression roller is increased, and the production efficiency is improved. And the design of the roller press and the battery pole piece manufacturing system is simplified and miniaturized.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a pressure roller, a roller press, and a battery electrode manufacturing system. Background Technology

[0002] Electrode rolling refers to the process of compacting battery electrodes that have been dried to a certain degree. It is a downstream process of coating and one of the key steps in battery electrode manufacturing. After coating and drying, the peel strength between the active material and the current collector substrate is relatively low, so it is necessary to roll the electrodes to enhance the adhesion strength between the active material and the substrate, preventing them from peeling off during electrolyte immersion and battery use.

[0003] Existing technologies commonly use two-roll presses to roll electrode sheets. A two-roll press consists of two cast steel rollers, a motor, and a drive shaft. For rolling wide electrode sheets, a relatively long roller is required. During the rolling process, the roller is subjected to the reaction force of the electrode sheet, which produces slight deflection. This results in inconsistent thickness between the center and the edge of the electrode sheet, leading to uneven electrode thickness and reduced electrode quality. Utility Model Content

[0004] Therefore, it is necessary to provide a pressure roller, a roller press, and a battery electrode manufacturing system to solve the technical problem of uneven rolling of large-width battery electrodes in the prior art.

[0005] Therefore, according to one aspect of this application, a pressure roller is provided, the pressure roller comprising:

[0006] An inner roller, fixedly installed, has multiple hydraulic channels inside, extending from the end face of the inner roller to its outer circumference; and

[0007] The outer roller is rotatably fitted onto the inner roller, and the connection between the outer roller and the inner roller is sealed. The outer roller has multiple hydraulic chambers inside, which extend along the axial direction of the outer roller. During the rotation of the outer roller, some hydraulic chambers can be connected to different hydraulic channels, while some hydraulic chambers are blocked by the outer circumferential surface of the inner roller, so that each hydraulic chamber has a different pressure.

[0008] Optionally, the length of the hydraulic chamber is adapted to the length of the outer roller, and the hydraulic channel is provided with a first hydraulic port on the outer circumferential surface of the inner roller, and the hydraulic chamber is provided with a second hydraulic port corresponding to the first hydraulic port on the inner circumferential surface of the outer roller.

[0009] Optionally, the length of the hydraulic chamber is adapted to the length of the outer roller, and the hydraulic channel is provided with a plurality of first hydraulic ports on the outer circumferential surface of the inner roller, and the hydraulic chamber is provided with a plurality of second hydraulic ports on the inner circumferential surface of the outer roller, each corresponding to one of the plurality of first hydraulic ports.

[0010] Optionally, multiple hydraulic chambers form multiple sets of hydraulic chambers, each set of hydraulic chambers has multiple hydraulic chambers, and the multiple hydraulic chambers of each set are arranged sequentially along the axial direction of the outer roller. During the rotation of the outer roller, the multiple hydraulic chambers of each set can be connected to a hydraulic flow channel at the same time.

[0011] Optionally, multiple hydraulic chambers form multiple sets of hydraulic chambers, each set of hydraulic chambers has multiple hydraulic chambers, and the multiple hydraulic chambers of each set are arranged sequentially along the axial direction of the outer roller. During the rotation of the outer roller, the multiple hydraulic chambers of each set can be simultaneously connected to multiple hydraulic channels one by one.

[0012] Optionally, a drive gear is fixedly connected to one end of the outer roller, and the drive gear is used to connect an external rotary drive mechanism.

[0013] Optionally, a reinforcing ring is detachably provided on the outer circumferential surface of the inner roller, and the end face of the outer roller away from the drive gear presses against the reinforcing ring. The reinforcing ring is used to restrict the movement of the outer roller along its axial direction.

[0014] Optionally, the hydraulic chamber is composed of multiple large chambers and multiple small chambers connected together, with the large chambers and multiple small chambers distributed alternately in sequence.

[0015] According to another aspect of this application, a roller press is provided, which includes two pressure rollers as described above, wherein the pressure in the hydraulic chamber of any one pressure roller near the other pressure roller is greater than the pressure in the other hydraulic chambers.

[0016] According to another aspect of this application, a battery electrode manufacturing system is provided, which includes the roller press as described above.

[0017] The beneficial effects of the pressure roller, roller press, and battery electrode manufacturing system provided in this application are as follows: Compared with the prior art, the pressure roller of this application includes an inner roller and an outer roller. The outer roller is rotatably and sealedly fitted onto the inner roller. The inner roller has multiple hydraulic channels, and the outer roller has multiple hydraulic chambers. During the rotation of the outer roller, some hydraulic chambers can be connected to different hydraulic channels, while some hydraulic chambers are blocked by the outer circumferential surface of the inner roller, so that each hydraulic chamber has different pressure. The pressure value in each hydraulic chamber is controlled according to the actual working conditions to compensate for the deflection of the pressure roller during the rolling process, making the pressure roller less prone to bending. The position of the pressure roller in contact with the electrode always remains straight, and the rolling of the battery electrode is more uniform, improving the quality of the battery electrode. At the same time, while ensuring the rolling quality, the length-to-diameter ratio of the pressure roller is increased, which simplifies and miniaturizes the design of the roller press and the battery electrode manufacturing system, making it easier to transport, install, debug, and control, and reducing manufacturing costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 Schematic cross-sectional view of the pressure roller provided in the first embodiment of this application Figure 1 ;

[0020] Figure 2 Schematic cross-sectional view of the pressure roller provided in the first embodiment of this application Figure 2 ;

[0021] Figure 3 This is a cross-sectional view of the pressure roller provided in the second embodiment of this application;

[0022] Figure 4 A cross-sectional view of the pressure roller provided in the third embodiment of this application;

[0023] Figure 5 This is a cross-sectional view of the pressure roller provided in the fourth embodiment of this application;

[0024] Figure 6 This is a front view structural diagram of the roller press provided in an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Inner roller; 110. Hydraulic flow channel; 120. First hydraulic port; 2. Outer roller; 210. Hydraulic chamber; 220. Second hydraulic port; 3. Drive gear; 4. Reinforcing ring. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] 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 based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, 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, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] According to one aspect of this application, embodiments of this application provide a pressure roller, which should also be referred to... Figures 1 to 6 The pressure roller includes an inner roller 1 and an outer roller 2. The inner roller 1 is fixedly installed and has multiple hydraulic channels 110 inside. The hydraulic channels 110 extend from the end face of the inner roller 1 to the outer circumferential surface of the inner roller 1. The outer roller 2 is rotatably sleeved on the inner roller 1, and the connection between the outer roller 2 and the inner roller 1 is sealed. The outer roller 2 has multiple hydraulic chambers 210 inside. The hydraulic chambers 210 extend along the axial direction of the outer roller 2. During the rotation of the outer roller 2, some hydraulic chambers 210 can be connected with different hydraulic channels 110, and some hydraulic chambers 210 are blocked by the outer circumferential surface of the inner roller 1, so that each hydraulic chamber 210 has a different pressure.

[0034] In this embodiment, the pressure roller includes an inner roller 1 and an outer roller 2. The outer roller 2 is rotatably and sealed within the inner roller 1. The inner roller 1 has multiple hydraulic channels 110 inside, and the outer roller 2 has multiple hydraulic chambers 210 inside. During the rotation of the outer roller 2, some hydraulic chambers 210 can be connected to different hydraulic channels 110, and some hydraulic chambers 210 are blocked by the outer circumferential surface of the inner roller 1, so that each hydraulic chamber 210 has different pressure. The pressure value in each hydraulic chamber 210 is controlled according to the actual working conditions to compensate for the deflection generated by the pressure roller during the rolling process, making the pressure roller less prone to bending. The position of the pressure roller for contacting the electrode sheet always remains straight, and the rolling of the battery electrode sheet is more uniform, thus improving the quality of the battery electrode sheet.

[0035] In the first embodiment of the pressure roller, please refer to Figure 1 The length of the hydraulic chamber 210 is adapted to the length of the outer roller 2. The hydraulic channel 110 is provided with a first hydraulic port 120 on the outer circumferential surface of the inner roller 1, and the hydraulic chamber 210 is provided with a second hydraulic port 220 corresponding to the first hydraulic port 120 on the inner circumferential surface of the outer roller 2.

[0036] In the second embodiment, please refer to Figure 3The length of the hydraulic chamber 210 is adapted to the length of the outer roller 2. The hydraulic channel 110 is provided with a plurality of first hydraulic ports 120 on the outer circumferential surface of the inner roller 1. The hydraulic chamber 210 is provided with a plurality of second hydraulic ports 220 on the inner circumferential surface of the outer roller 2, which correspond one-to-one with the plurality of first hydraulic ports 120.

[0037] In the third embodiment, please refer to Figure 4 Multiple hydraulic chambers 210 form multiple groups of hydraulic chambers 210. Each group of hydraulic chambers 210 has multiple hydraulic chambers 210. The multiple hydraulic chambers 210 in each group are arranged sequentially along the axial direction of the outer roller 2. During the rotation of the outer roller 2, the multiple hydraulic chambers 210 in each group can be simultaneously connected to a hydraulic flow channel 110.

[0038] In the fourth embodiment, please refer to Figure 5 Multiple hydraulic chambers 210 form multiple groups of hydraulic chambers 210. Each group of hydraulic chambers 210 has multiple hydraulic chambers 210. The multiple hydraulic chambers 210 in each group are arranged sequentially along the axial direction of the outer roller 2. During the rotation of the outer roller 2, the multiple hydraulic chambers 210 in each group can be simultaneously connected to multiple hydraulic channels 110 in a one-to-one correspondence.

[0039] Optionally, the structure of the hydraulic flow channel 110 and the hydraulic chamber 210 can be selected in the four embodiments described above according to actual needs, and is not intended to be the only limitation.

[0040] In one embodiment, please refer to [the relevant documentation / reference]. Figures 1 to 5 One end of the outer roller 2 is fixedly connected to a drive gear 3. The drive gear 3 is used to connect to an external rotary drive mechanism. The rotary drive mechanism drives the outer roller 2 to rotate, thereby realizing the relative rotation between the outer roller 2 and the inner roller 1.

[0041] In one embodiment, please refer to [the relevant documentation / reference]. Figures 1 to 5 A reinforcing ring 4 is detachably provided on the outer circumferential surface of the inner roller 1. The end face of the outer roller 2 away from the drive gear 3 presses against the reinforcing ring 4. The reinforcing ring 4 is made of high-strength material and is used to restrict the movement of the outer roller 2 along its axial direction and prevent the outer roller 2 and the inner roller 1 from sliding against each other.

[0042] In one embodiment, the hydraulic chamber 210 is composed of multiple large chambers and multiple small chambers connected together, with the multiple large chambers and multiple small chambers distributed alternately in sequence, so that the pressure roller is subjected to force as evenly as possible at each part of the axial direction.

[0043] In one embodiment, see Figure 2 The hydraulic flow channel 110 is provided with six channels, which are evenly arranged along the circumference of the inner roller 1. The hydraulic chamber 210 is provided with ten chambers, which are evenly arranged along the circumference of the outer roller 2.

[0044] It is understandable that the specific number of hydraulic channels 110 is selected based on the size of the inner roller 1, and the specific number of hydraulic chambers 210 is selected based on the size of the outer roller 2, and no single limit is imposed here.

[0045] According to another aspect of this application, please refer to [the relevant document / reference]. Figure 6 The embodiments of this application also provide a roller press, which includes two pressure rollers as described above, wherein the pressure in the hydraulic chamber 210 of any one pressure roller near the other pressure roller is greater than the pressure in the other hydraulic chambers 210.

[0046] According to another aspect of this application, embodiments of this application also provide a battery electrode manufacturing system, which includes the roller press as described above.

[0047] In this embodiment of the application, the roller press and battery electrode manufacturing system adopt the pressure rollers as described above. While ensuring the quality of roller pressing, the ratio of the length to the diameter of the pressure roller is increased, which simplifies and miniaturizes the design of the roller press and battery electrode manufacturing system, making it easier to transport, install, debug and control, and reducing manufacturing costs.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A pressure roller, characterized in that, include: An inner roller is fixedly installed, and multiple hydraulic channels are provided inside the inner roller, which extend from the end face of the inner roller to the outer circumferential surface of the inner roller. as well as An outer roller is rotatably fitted onto an inner roller, and the connection between the outer roller and the inner roller is sealed. The outer roller has multiple hydraulic chambers inside, which extend along the axial direction of the outer roller. During the rotation of the outer roller, some of the hydraulic chambers can communicate with different hydraulic channels, while some of the hydraulic chambers are blocked by the outer circumferential surface of the inner roller, so that each hydraulic chamber has a different pressure.

2. The pressure roller according to claim 1, characterized in that, The length of the hydraulic chamber is adapted to the length of the outer roller. The hydraulic channel is provided with a first hydraulic port on the outer circumferential surface of the inner roller, and the hydraulic chamber is provided with a second hydraulic port corresponding to the first hydraulic port on the inner circumferential surface of the outer roller.

3. The pressure roller according to claim 1, characterized in that, The length of the hydraulic chamber is adapted to the length of the outer roller. The hydraulic channel is provided with a plurality of first hydraulic ports on the outer circumferential surface of the inner roller. The hydraulic chamber is provided with a plurality of second hydraulic ports on the inner circumferential surface of the outer roller, which correspond one-to-one with the plurality of first hydraulic ports.

4. The pressure roller according to claim 1, characterized in that, Multiple hydraulic chambers form multiple groups of hydraulic chambers, and each group of hydraulic chambers has multiple hydraulic chambers. The multiple hydraulic chambers in each group are arranged sequentially along the axial direction of the outer roller. During the rotation of the outer roller, the multiple hydraulic chambers in each group can be simultaneously connected to a hydraulic flow channel.

5. The pressure roller according to claim 1, characterized in that, Multiple hydraulic chambers form multiple groups of hydraulic chambers, and each group of hydraulic chambers has multiple hydraulic chambers. The multiple hydraulic chambers in each group are arranged sequentially along the axial direction of the outer roller. During the rotation of the outer roller, the multiple hydraulic chambers in each group can be simultaneously connected to multiple hydraulic channels in a one-to-one correspondence.

6. The pressure roller according to any one of claims 1-5, characterized in that, One end of the outer roller is fixedly connected to a drive gear, which is used to connect an external rotation drive mechanism.

7. The pressure roller according to claim 6, characterized in that, A reinforcing ring is detachably provided on the outer circumferential surface of the inner roller, and the end face of the outer roller away from the drive gear presses against the reinforcing ring. The reinforcing ring is used to restrict the movement of the outer roller along its axial direction.

8. The pressure roller according to any one of claims 1-5, characterized in that, The hydraulic chamber is composed of multiple large chambers and multiple small chambers connected together, with the multiple large chambers and multiple small chambers distributed alternately in sequence.

9. A roller press, characterized in that, It includes two pressure rollers as described in any one of claims 1-8, wherein the pressure in the hydraulic chamber of one pressure roller near the other pressure roller is greater than the pressure in the other hydraulic chambers.

10. A battery electrode manufacturing system, characterized in that, Including the roller press as described in claim 9.

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