Rolling device and pole piece processing equipment
By designing a roller pressing device including a stretching roller, a spacer and a rubber sleeve, the wrinkle problem caused by inconsistent extension of the coating area and the ear region during the rolling process of the lithium battery electrode sheet is solved, and the effect of reducing the wrinkle of the ear and improving the productivity is achieved.
Patent Information
- Application Number
- CN202420285556.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-06
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-02-06
AI Technical Summary
During the rolling process of the lithium battery electrode sheet, the extension of the coating area and the pole ear area is inconsistent, which easily leads to wrinkles at the joints of the two.
A rolling device is designed, including an extension roller, a spacer and a rubber sleeve. The spacer sleeve is provided on the extension roller to form an outer peripheral surface with a groove, and the rubber sleeve is provided in the groove, protruding from the outer peripheral surface of the spacer. The device makes the ears stretched by pressing the ears into the grooves, reducing redundancy and reducing the possibility of wrinkles at the ears.
It effectively reduces the redundancy between the connecting area between the electrode and the coating area, reduces the wrinkle situation at the electrode, improves the production efficiency of the electrode sheet, and reduces the production cost.
Smart Images
Figure CN222587637U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of battery technology, and in particular to a rolling device and pole piece processing equipment. Background Art
[0002] The production process of lithium battery pole pieces includes stirring, coating, rolling, slitting of pole tabs and other processes. Among them, lithium battery pole pieces are divided into a coating area and a pole tab area (empty foil area). The thickness of the coating area is higher than that of the pole tab area. During the rolling process, the coating area is close to the roller. Under the pressure of the roller, the foil in the coating area stretches more, while the pole tab area is in a suspended state. Under the pressure of the roller, the foil in the pole tab area stretches less. The inconsistent extension of the coating area and the pole tab area easily causes wrinkles at the junction of the two. Summary of the invention
[0003] The present disclosure provides a method to at least solve the above technical problems existing in the prior art.
[0004] A first aspect of the present disclosure provides a rolling device, comprising:
[0005] Spreading rollers;
[0006] A spacer sleeve is sleeved on the stretching roller, the spacer sleeve is detachably connected to the stretching roller, the spacer sleeve at least wraps a portion of the outer peripheral surface of the stretching roller, a groove is formed on the outer peripheral surface of the spacer sleeve, and the groove extends along the circumference of the spacer sleeve;
[0007] The rubber sleeve is arranged in the groove and is detachably connected to the spacer sleeve. The rubber sleeve protrudes from the outer peripheral surface of the spacer sleeve.
[0008] Furthermore, the surface of the groove transitions smoothly with the outer circumferential surface of the spacer.
[0009] Furthermore, along the radial direction of the stretching roller, a height H of the rubber sleeve protruding from the outer peripheral surface of the spacer sleeve and a thickness T of the electrode coating area before rolling satisfy: 1.3T≤H≤2T.
[0010] Furthermore, the groove is arranged corresponding to the empty foil area of the pole piece;
[0011] Along the axial direction of the stretching roller, the width W1 of the rubber sleeve and the width W2 of the empty foil area satisfy: 0.95W2≤W1≤1.05W2.
[0012] Furthermore, there are multiple grooves, and the multiple grooves are spaced apart and distributed along the axial direction of the stretching roller;
[0013] There are multiple rubber sleeves, and the rubber sleeves correspond to the grooves one by one.
[0014] Furthermore, the spacer is made of flexible material.
[0015] Furthermore, the height of the rubber sleeve along the radial direction of the stretching roller gradually decreases from the middle area in the axial direction of the stretching roller to both ends.
[0016] Furthermore, there is a smooth transition between the outer surface of the rubber sleeve and the surface of the groove.
[0017] Furthermore, both ends of the stretching roller are formed with fixed shafts, the fixed shafts are provided with positioning pieces, and at least part of the spacer sleeve is arranged between the positioning piece and the stretching roller.
[0018] A second aspect of the present disclosure provides a pole piece processing device, comprising the rolling device described in the first aspect.
[0019] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:
[0020] The rolling device provided by the embodiment of the present disclosure includes an extension roller, a spacer sleeve and a rubber sleeve; the spacer sleeve is arranged on the extension roller, and the spacer sleeve is detachably connected to the extension roller, and the spacer sleeve at least wraps a portion of the outer peripheral surface of the extension roller, and the outer peripheral surface of the spacer sleeve is formed with a groove, and the groove extends along the circumference of the spacer sleeve; the rubber sleeve is arranged in the groove, and is detachably connected to the spacer sleeve, and the rubber sleeve protrudes from the outer peripheral surface of the spacer sleeve. When in use, the pole ear area is aligned with the groove, and the extension roller can press the pole ear area into the area where the groove is located during the rolling process, so that the pole ear is stretched, and the redundancy is released, reducing the possibility of redundancy in the area where the pole ear and the coating area are connected, resulting in wrinkles at the pole ear. The rubber sleeve protrudes from the outer surface of the spacer sleeve to stretch the pole ear, so that the redundancy is released, and the situation of wrinkles at the pole ear is reduced.
[0021] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:
[0023] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.
[0024] Figure 1 A schematic structural diagram of a rolling device provided by an embodiment of the present disclosure is shown;
[0025] Figure 2 The main structure diagram of the rolling device provided by the embodiment of the present disclosure is shown. Figure 1 ;
[0026] Figure 3 The main structure diagram of the rolling device provided by the embodiment of the present disclosure is shown. Figure 2 ;
[0027] Figure 4 It is a schematic diagram of the structure of the electrode.
[0028] Explanation of the numbers in the figure: 1. fixed shaft; 2. spacer; 21. groove; 3. rubber sleeve; 4. positioning piece; 5. coating area; 6. empty foil area. DETAILED DESCRIPTION
[0029] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.
[0030] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the rolling device provided by the embodiment of the present disclosure includes an extension roller, a spacer sleeve 2 and a rubber sleeve 3; the spacer sleeve 2 is sleeved on the extension roller, and the spacer sleeve 2 is detachably connected to the extension roller. The spacer sleeve 2 at least wraps a portion of the outer peripheral surface of the extension roller. The spacer sleeve 2 may include the entire extension roller, or may wrap a section of the outer peripheral surface of the extension roller in the axial direction. The outer peripheral surface of the spacer sleeve 2 is formed with a groove 21, and the groove 21 extends along the circumference of the spacer sleeve 2; the rubber sleeve 3 is arranged in the groove 21, and is detachably connected to the spacer sleeve 2, and the rubber sleeve 3 protrudes from the outer peripheral surface of the spacer sleeve 2. When in use, the pole ear area is aligned with the groove 21, and the extension roller can press the pole ear area into the area where the groove 21 is located during the rolling process, so that the pole ear is stretched, and the redundancy is released, reducing the possibility of redundancy in the area where the pole ear and the coating area 5 are connected, resulting in wrinkles at the pole ear. The rubber sleeve 3 protrudes from the outer surface of the spacer sleeve 2 to stretch the pole ear, release the redundancy, and reduce the wrinkles at the pole ear. The rolling device provided in the embodiment of the present disclosure can reduce the probability of tab damage, reduce production costs, and improve production quality.
[0031] The rubber sleeve 3 is detachably connected to the spacer sleeve 2, so that the rubber sleeve 3 can be easily replaced to adapt to the width of the empty foil area 6 on the pole pieces of different specifications.
[0032] The spacer sleeve 2 is detachably connected to the extension roller, so that the spacer sleeve 2 is easy to replace.
[0033] In this embodiment, the rubber sleeve 3 is arranged in the groove 21, so that the groove 21 and the surface of the rubber sleeve 3 facing the pole ear area form a wave shape, which increases the surface area, thereby stretching the pole ear area, releasing the redundancy and reducing wrinkles at the pole ear.
[0034] In some specific embodiments, the surface of the groove 21 and the outer peripheral surface of the spacer 2 are smoothly transitioned, which can reduce the possibility of the tab being crushed.
[0035] In some specific embodiments, along the radial direction of the stretching roller, the height H of the rubber sleeve 3 protruding from the outer peripheral surface of the spacer sleeve 2 and the thickness T of the electrode coating area before rolling satisfy: 1.3T≤H≤2T. Since the elongation rate of the empty foil area 6 required to be achieved by each specification of the electrode is different, the height range of the rubber sleeve 3 is limited for this purpose. Different heights of the rubber sleeve 3 represent different elongation rates of the empty foil area 6 after being rolled by the rubber sleeve 3. The larger the height of the rubber sleeve 3, the greater the elongation rate. This embodiment can make the rubber sleeve 3 press the pole ear to form a certain tension on the surface of the pole ear, so that the tension between the pole ear area and the coating area 5 is very close, and when the stretching roller is rolled, the problem of wrinkling of the pole ear caused by insufficient tension can be reduced.
[0036] In some specific embodiments, the groove 21 is arranged corresponding to the empty foil area 6 of the electrode piece; along the axial direction of the stretching roller, the width W1 of the rubber sleeve 3 and the width W2 of the empty foil area 6 satisfy: 0.95W2≤W1≤1.05W2, which can correspond to the width of the empty foil area 6 on the electrode pieces of different specifications, so that the rubber sleeve 3 can press the electrode ear to form a certain tension on the surface of the electrode ear, so that the tension between the electrode ear area and the coating area 5 is very close, and when the stretching roller is rolled, the problem of wrinkling of the electrode ear caused by insufficient tension can be reduced.
[0037] In some specific embodiments, there are multiple grooves 21, which are spaced apart along the axial direction of the stretching roller; there are multiple rubber sleeves 3, which correspond one to one with the grooves 21. By providing multiple grooves 21 and rubber sleeves 3, multiple empty foil areas 6 on the pole piece can be rolled at the same time, which can effectively improve the efficiency of solving the wrinkle and stretch problems of the empty foil area 6, increase the output of the pole piece, and thus improve the production efficiency of the battery.
[0038] In some specific embodiments, the spacer 2 is made of a flexible material, which can reduce the possibility of the tab being crushed.
[0039] In some specific embodiments, the height of the rubber sleeve 3 along the radial direction of the stretching roller gradually decreases from the middle area on the axial direction of the stretching roller to both ends to form a certain tension on the surface of the pole ear, and can also reduce the situation where the pole ear is subjected to force and produces marks due to the concentrated pressing force of the rubber sleeve 3.
[0040] In some specific implementations, a smooth transition between the outer surface of the rubber sleeve 3 and the surface of the groove 21 can reduce the situation where the tab is subjected to stress and marks due to the concentrated pressing force of the rubber sleeve 3.
[0041] In some specific embodiments, the rubber sleeve 3 can be made of an elastic material, which can play a buffering role, allowing part of the active substance to enter the tab area and reduce the height difference of the transition area.
[0042] In some specific embodiments, both ends of the stretching roller are formed with a fixed shaft 1, the fixed shaft 1 is provided with a positioning member 4, and at least part of the spacer sleeve 2 is arranged between the positioning member 4 and the stretching roller to facilitate the disassembly and installation of the spacer sleeve 2.
[0043] The positioning member 4 may be a positioning ring, a positioning block or a positioning nut, etc.
[0044] The pole piece processing equipment provided in the embodiment of the present disclosure includes the rolling device provided in the embodiment of the present disclosure. Since the pole piece processing equipment provided in the embodiment of the present disclosure has the same advantages as the rolling device provided in the embodiment of the present disclosure, they will not be described in detail here.
[0045] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of this disclosure can be achieved, and this document is not limited here.
[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0047] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.
Claims
1. A rolling device, characterized in that: include: Spreading rollers; A spacer sleeve (2) is sleeved on the stretching roller, the spacer sleeve (2) is detachably connected to the stretching roller, the spacer sleeve (2) at least wraps a portion of the outer peripheral surface of the stretching roller, a groove (21) is formed on the outer peripheral surface of the spacer sleeve (2), and the groove (21) extends along the circumference of the spacer sleeve (2); The rubber sleeve (3) is arranged in the groove (21) and is detachably connected to the spacer sleeve (2). The rubber sleeve (3) protrudes from the outer peripheral surface of the spacer sleeve (2).
2. The rolling device according to claim 1, characterized in that: The surface of the groove (21) transitions smoothly with the outer peripheral surface of the spacer (2).
3. The rolling device according to claim 1, characterized in that: Along the radial direction of the stretching roller, the height H of the rubber sleeve (3) protruding from the outer peripheral surface of the spacer sleeve (2) and the thickness T of the electrode coating area (5) before rolling satisfy the following relationship: 1.3T≤H≤2T.
4. The rolling device according to claim 1, characterized in that: The groove (21) is arranged corresponding to the empty foil area (6) of the pole piece; Along the axial direction of the stretching roller, the width W1 of the rubber sleeve (3) and the width W2 of the empty foil area (6) satisfy: 0.95W2≤W1≤1.05W2.
5. The rolling device according to claim 1, characterized in that: The number of the grooves (21) is multiple, and the multiple grooves (21) are distributed at intervals along the axial direction of the stretching roller; The number of the rubber sleeves (3) is plural, and the rubber sleeves (3) correspond to the grooves (21) one by one.
6. The rolling device according to claim 1, characterized in that: The spacer (2) is made of flexible material.
7. The rolling device according to claim 1, characterized in that: The height of the rubber sleeve (3) along the radial direction of the stretching roller gradually decreases from the middle area in the axial direction of the stretching roller to both ends.
8. The rolling device according to claim 1, characterized in that: There is a smooth transition between the outer surface of the rubber sleeve (3) and the surface of the groove (21).
9. The rolling device according to claim 1, characterized in that: The two ends of the stretching roller are fixed with a fixed shaft (1), the fixed shaft (1) is provided with a positioning piece (4), and at least part of the spacer (2) is arranged between the positioning piece (4) and the stretching roller.
10. A pole piece processing device, characterized in that: The invention comprises the rolling device as claimed in any one of claims 1 to 9.