Pole piece rolling device
By designing a pole rolling device including heating channels, stretching components and heating roller components, the problem of subsequent easy-to-break belt of high-pressure pole sheet is solved, efficient compaction and mass production are achieved, and the energy density of the battery and the thinness of the pole sheet are improved.
Patent Information
- Application Number
- CN202422061589.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-23
AI Technical Summary
During the manufacturing process of the electrode sheet, the high-pressure electrode sheet is prone to breaking the belt, which leads to difficulty in coordinating the subsequent process, affecting the energy density of the battery and the thinness of the electrode sheet.
A pole sheet rolling device is designed, including a heating channel, a stretching assembly and a heating roller assembly, and mass production of high-pressure pole sheets is achieved through preheating, stretching and heating softening treatment.
This device effectively solves the problem of easy breaking of the belt of the high-pressure pole sheet after the roll, realizes efficient compaction and mass production of the pole sheet, and improves the energy density of the battery and the thinness of the pole sheet.
Smart Images
Figure CN223038958U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of pole piece manufacturing, and particularly to a pole piece rolling device. Background Art
[0002] During the manufacturing process of a pole piece, the active material needs to be slurried to prepare a uniform solution first, and then coated on a copper foil or aluminum foil current collector. After drying, the initial pole piece can be obtained. At this time, the pole piece is too thick and the voids in the system are too large, which is not conducive to electron conduction. Therefore, the pole piece needs to be rolled, and only after rolling can the conditions for preparing a battery be met.
[0003] The energy density of a battery is related to the number of pole pieces accommodated in a unit battery case. For the same pole piece, the thinner it is, the more can be loaded into the battery. This requires the initial pole piece to withstand a large rolling pressure to be rolled thin.
[0004] In related technologies, for a pole piece, the greater the compaction of the pole piece, the harder the pole piece becomes, and it is more likely to break the belt after passing through the roller. This means that the pole piece cannot pass through the roller subsequently, and thus the coordinated operation between processes cannot be achieved. Summary of the Utility Model
[0005] This application provides a pole piece rolling device. The pole piece is sequentially processed through preheating in a heating channel, stretching by a stretching component, softening and stretching by a heating roller component, realizing the mass production of high-compaction pole pieces and solving the problem that high-compaction pole pieces are prone to break the belt during subsequent rolling.
[0006] In a first aspect, an embodiment of this application provides a pole piece rolling device, which includes:
[0007] A heating channel for preheating the pole piece;
[0008] A stretching component for stretching the pole piece. Along the pole piece conveying direction, the stretching component is arranged downstream of the heating channel;
[0009] A heating roller component for softening and stretching the pole piece. Along the pole piece conveying direction, the heating roller component is arranged downstream of the stretching component.
[0010] In combination with the first aspect, in an embodiment, the temperature range of the heating channel is 0 - 65°C.
[0011] In combination with the first aspect, in an embodiment, the heating channel includes:
[0012] Two heating plates. The two heating plates are spaced apart along the thickness direction of the pole piece. The two heating plates are respectively located above and below the pole piece, and the spacing between the two heating plates forms the heating channel.
[0013] In combination with the first aspect, in one embodiment, the stretching assembly includes:
[0014] A first balance roller, along the conveying direction of the pole piece, the first balance roller is arranged downstream of the heating channel;
[0015] A tension roller, along the conveying direction of the pole piece, the tension roller is arranged downstream of the first balance roller;
[0016] A second balance roller, along the conveying direction of the pole piece, the second balance roller is arranged downstream of the tension roller.
[0017] In combination with the first aspect, in one embodiment, the diameter of the tension roller is larger than the diameters of the first balance roller and the second balance roller, and the tension roller is located below or above the middle of the first balance roller and the second balance roller.
[0018] In combination with the first aspect, in one embodiment, along the conveying direction of the pole piece, the heating temperature of the heating roller assembly is set to rise or be constant, and its temperature range is 50 - 130 °C.
[0019] In combination with the first aspect, in one embodiment, the heating roller assembly includes:
[0020] A first heating roller, a second heating roller, a third heating roller, and a fourth heating roller, along the conveying direction of the pole piece, the first heating roller, the second heating roller, the third heating roller, and the fourth heating roller are arranged at intervals in sequence, and the first heating roller is located downstream of the stretching assembly.
[0021] In combination with the first aspect, in one embodiment, the second heating roller is located above or below the middle of the first heating roller and the third heating roller, and the third heating roller is located below or above the middle of the second heating roller and the fourth heating roller.
[0022] In combination with the first aspect, in one embodiment, the heating temperature of the first heating roller is 70 °C, the heating temperature of the second heating roller is 75 °C, the heating temperature of the third heating roller is 80 °C, and the heating temperature of the fourth heating roller is 85 °C.
[0023] In combination with the first aspect, in one embodiment, the heating temperatures of the first heating roller, the second heating roller, the third heating roller, and the fourth heating roller are all 80 °C.
[0024] The beneficial effects brought by the technical solutions provided in the embodiments of the present application include:
[0025] After rolling, the initial electrode sheet is first preheated through a heating channel. The electrode sheet exiting the heating channel is rectified and stretched by a stretching assembly. After the stretching is completed, the electrode sheet is heat-treated by a heating roller assembly. After the heat treatment, it can play a role in softening the electrode sheet. The softened electrode sheet is subsequently rolled, die-cut, laser-cut, or wound. This solves the problem that the high-compaction electrode sheet is prone to breakage when passing through the roller subsequently. Through the preheating of the heating channel, the stretching of the stretching assembly, and the softening and stretching process of the heating roller assembly in sequence, the mass production of high-compaction electrode sheets is achieved. Brief Description of the Drawings
[0026] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0027] Figure 1 It is a schematic structural diagram of an electrode sheet rolling device.
[0028] In the figure: 1. Heating channel; 11. Heating plate; 2. Stretching assembly; 21. First balance roller; 22. Tension roller; 23. Second balance roller; 3. Heating roller assembly; 31. First heating roller; 32. Second heating roller; 33. Third heating roller; 34. Fourth heating roller; 4. Electrode sheet. Detailed Embodiments
[0029] To enable those skilled in the art to better understand the solution of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.
[0030] The embodiment of the present application provides an electrode sheet rolling device. The electrode sheet is sequentially processed through the preheating of the heating channel, the stretching of the stretching assembly, and the softening and stretching processes of the heating roller assembly, achieving the mass production of high-compaction electrode sheets and solving the problem that the high-compaction electrode sheet is prone to breakage when passing through the roller subsequently.
[0031] As Figure 1 shown, the embodiment of the present application provides an electrode sheet rolling device, which may include: a heating channel 1 for preheating the electrode sheet 4; a stretching assembly 2 for stretching the electrode sheet 4, and along the conveying direction of the electrode sheet 4, the stretching assembly 2 is arranged downstream of the heating channel 1; a heating roller assembly 3 for softening and stretching the electrode sheet 4, and along the conveying direction of the electrode sheet 4, the heating roller assembly 3 is arranged downstream of the stretching assembly 2.
[0032] Exemplarily, specifically referring to Figure 1 , in the left-to-right direction, which is also the conveying direction of the pole piece 4, there are successively arranged a heating channel 1 for preheating the pole piece 4, a stretching assembly 2 for stretching the pole piece 4, and a heating roller assembly 3 for softening and stretching the pole piece 4. It should be noted that the pole piece rolling device provided in the present application has high practicability. It can be arranged before the rolling process in the existing pole piece preparation process, or before the die-cutting process in the existing pole piece preparation process, or before the laser cutting process in the existing pole piece preparation process, or before the winding process in the existing pole piece preparation process, and can achieve the purpose of preventing the pole piece from breaking. Specifically, the initial pole piece 4 is first preheated through the heating channel 1, and the pole piece 4 exiting the heating channel 1 is stretched by the stretching assembly 2. After the stretching is completed, the pole piece 4 is heat-treated by the heating roller assembly 3. After the heat treatment, it can play a role in softening the pole piece 4. The softened pole piece 4 is then subjected to subsequent processes such as rolling, die-cutting, laser cutting, or winding. The problem that the high-compaction pole piece 4 is prone to breakage during subsequent passing through the rollers is solved. Through the preheating of the heating channel 1, the stretching of the stretching assembly 2, and the softening and stretching processes of the heating roller assembly 3 in sequence, the mass production of the high-compaction pole piece 4 is realized.
[0033] Combined with the first aspect, in an embodiment, the temperature range of the heating channel 1 is 0 - 65°C. Exemplarily, the temperature range of the heating channel 1 can be set within the range of 0 - 65°C. Among them, the temperature of the heating channel 1 should not be too high. Only the pole piece 4 needs to be preheated in the initial stage for preliminary softening.
[0034] Combined with the first aspect, in an embodiment, as Figure 1 shown, the heating channel 1 may include: two heating plates 11, which are spaced apart along the thickness direction of the pole piece 4. The two heating plates 11 are respectively located above and below the pole piece 4, and the spacing between the two heating plates 11 forms the heating channel 1. Exemplarily, the two heating plates 11 are spaced apart in the up-and-down direction, and their length direction extends along the left-and-right direction. The spacing in the middle of the two is the heating channel 1 for preheating the pole piece 4 during conveyance.
[0035] Combined with the first aspect, in an embodiment, as Figure 1 shown, the stretching assembly 2 may include: a first balance roller 21. Along the conveying direction of the pole piece 4, the first balance roller 21 is arranged downstream of the heating channel 1; a tension roller 22. Along the conveying direction of the pole piece 4, the tension roller 22 is arranged downstream of the first balance roller 21; a second balance roller 23. Along the conveying direction of the pole piece 4, the second balance roller 23 is arranged downstream of the tension roller 22.
[0036] Exemplarily, the stretching assembly 2 successively includes a first balancing roller 21, a tension roller 22, and a second balancing roller 23. The pole piece exiting the heating channel 1 is straightened by the first balancing roller 21 and undergoes the first stretching through the tension roller 22. The first balancing roller 21, the tension roller 22, and the second balancing roller 23 form the entire stretching system. After the first stretching is completed, the pole piece 4 then enters the subsequent heating roller assembly 3.
[0037] Combined with the first aspect, in an embodiment, the diameter of the tension roller 22 is greater than the diameters of the first balancing roller 21 and the second balancing roller 23, and the tension roller 22 is located below or above the midpoints of the first balancing roller 21 and the second balancing roller 23. Exemplarily, as Figure 1 shown, the diameter of the tension roller 22 is greater than the diameters of the first balancing roller 21 and the second balancing roller 23, and the contact area with the pole piece 4 is larger, which can achieve a good and stable stretching effect on the preheated pole piece 4. Moreover, the tension roller 22 is located below the midpoints of the first balancing roller 21 and the second balancing roller 23, ensuring the stretching purpose of the tension roller 22. Of course, in some embodiments, the tension roller 22 can also be located above the midpoints of the first balancing roller 21 and the second balancing roller 23 to ensure the stretching purpose of the tension roller 22.
[0038] Combined with the first aspect, in an embodiment, along the conveying direction of the pole piece 4, the heating temperature of the heating roller assembly 3 is set to increase gradually or be kept constant. Exemplarily, along the conveying direction of the pole piece 4, the heating temperature of the heating roller assembly 3 is set to increase gradually. The advantage of setting the heating temperature of the heating roller assembly 3 to increase gradually is that the pole piece 4 is heated gradually, avoiding high-temperature burns to the pole piece 4. After passing through multiple heating rollers, the pole piece 4 can be softened. The softened pole piece 4 is then subjected to subsequent processes such as roll pressing, die cutting, laser cutting, or winding. Of course, in some embodiments, the heating temperature of the heating roller assembly 3 can also be set to be kept constant.
[0039] Combined with the first aspect, in an embodiment, the heating temperature range of the heating roller assembly 3 is 50 - 130 °C.
[0040] Combined with the first aspect, in an embodiment, as Figure 1 shown, the heating roller assembly 3 may include: a first heating roller 31, a second heating roller 32, a third heating roller 33, and a fourth heating roller 34. Along the conveying direction of the pole piece 4, the first heating roller 31, the second heating roller 32, the third heating roller 33, and the fourth heating roller 34 are successively spaced apart, and the first heating roller 31 is located downstream of the stretching assembly 2.
[0041] Exemplarily, along the conveying direction of the pole piece 4, the first heating roller 31, the second heating roller 32, the third heating roller 33 and the fourth heating roller 34 are sequentially and spaced apart. The first heating roller 31 is located downstream of the stretching assembly 2. After the first stretching is completed, the pole piece 4 sequentially passes through the first heating roller 31, the second heating roller 32, the third heating roller 33 and the fourth heating roller 34. After passing through multiple heating rollers, the pole piece 4 can be softened. The softened pole piece 4 is then subjected to processes such as rolling, die cutting, laser cutting or winding.
[0042] Combined with the first aspect, in an embodiment, as Figure 1 shown, the second heating roller 32 is located above and in the middle of the first heating roller 31 and the third heating roller 33, and the third heating roller 33 is located below and in the middle of the second heating roller 32 and the fourth heating roller 34. Of course, in some embodiments, the second heating roller 32 can also be located below and in the middle of the first heating roller 31 and the third heating roller 33, and the third heating roller 33 can also be located above and in the middle of the second heating roller 32 and the fourth heating roller 34.
[0043] Exemplarily, the straight-line connections of the centers of the first heating roller 31, the second heating roller 32, the third heating roller 33 and the fourth heating roller 34 are arranged in a parallelogram, which can achieve the purpose of heating and softening the stretched pole piece and then stretching it again, improving the production quality of the pole piece 4. Using a few simple heating rollers can commercialize the high-compaction pole piece 4. The operation is simple, the process is simple, and the production cost of the battery will not be increased.
[0044] Combined with the first aspect, in an embodiment, the heating temperature of the first heating roller 31 is 70 °C, the heating temperature of the second heating roller 32 is 75 °C, the heating temperature of the third heating roller 33 is 80 °C, and the heating temperature of the fourth heating roller 34 is 85 °C. Exemplarily, a multi-gradient climbing temperature can be set from the first heating roller 31 to the fourth heating roller 34, such as 70 °C, 75 °C, 80 °C, 85 °C. The advantage of the multi-gradient is that the pole piece 4 is gradually heated, avoiding high-temperature burning of the pole piece 4. After passing through multiple heating rollers, the pole piece 4 can be softened. The softened pole piece 4 can then be subjected to subsequent processes such as rolling, die cutting, laser cutting or winding.
[0045] Combined with the first aspect, in an embodiment, the heating temperatures of the first heating roller 31, the second heating roller 32, the third heating roller 33 and the fourth heating roller 34 are all 80 °C.
[0046] Among them, a calculation method for evaluating the tensile strength of the pole piece 4 is as follows:
[0047] σ = F / L
[0048] In the formula: σ represents the tensile strength, F represents the drawing force, and L represents the stretching length.
[0049] Its meaning indicates the tensile force received by the pole piece 4 per unit length. The smaller σ is, the greater the tensile strength of the pole piece, and the less likely the pole piece 4 is to break during mass production, and vice versa.
[0050] See Table 1 below. Table 1 shows the test data of Examples 1-5.
[0051]
[0052] Among them, comparing Examples 1-3, or comparing Examples 4 and 5, it shows that when the temperature of the heating channel 1 is constant, as the temperature of the heating roller assembly 3 increases, the tensile strength of the pole piece 4 is better, indicating that the flexibility of the pole piece 4 is better. Comparing Example 1 and Example 4, or comparing Example 2 and Example 5, it shows that when the temperature of the heating roller assembly 3 is constant, the increase in the preheating temperature of the pole piece 4 by the heating channel 1 is also beneficial to improving its tensile strength.
[0053] However, in Examples 3 and 5, due to the excessive tensile strength, the pole piece 4 prepared will inevitably undergo large deformations during actual application, resulting in changes in the areal density and compaction of the pole piece 4, thus affecting its use; while in Example 1, due to the too weak tensile strength, the pole piece 4 prepared is prone to breakage problems during actual application; therefore, the heating temperatures of Examples 2 and 4 can be considered for the mass production of the pole piece 4. If it is considered that the temperature span between the heating channel 1 and the heating roller assembly 3 in Example 2 is too large and affects the production quality of the pole piece 4, the heating temperature of Example 4 can be preferably selected for the mass production of the pole piece 4.
[0054] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0055] It should be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.
[0056] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will conform to the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A pole piece rolling device, characterized in that: It includes: A heating channel (1) for preheating the pole piece (4); A stretching assembly (2) for stretching the pole piece (4), wherein the stretching assembly (2) is arranged downstream of the heating channel (1) along the conveying direction of the pole piece (4); A heating roller assembly (3) is used for softening and stretching the pole piece (4). Along the conveying direction of the pole piece (4), the heating roller assembly (3) is arranged downstream of the stretching assembly (2).
2. The pole piece rolling device according to claim 1, characterized in that: The temperature range of the heating channel (1) is 0-65°C.
3. The pole piece rolling device according to claim 1, characterized in that: The heating channel (1) comprises: Two heating plates (11), the two heating plates (11) are spaced apart along the thickness direction of the pole piece (4), the two heating plates (11) are respectively located above and below the pole piece (4), and the spacing between the two heating plates (11) forms the heating channel (1).
4. The pole piece rolling device according to claim 1, characterized in that: The stretching assembly (2) comprises: A first balancing roller (21), arranged downstream of the heating channel (1) along the conveying direction of the pole piece (4); a tension roller (22), arranged downstream of the first balancing roller (21) along the conveying direction of the pole piece (4); A second balancing roller (23) is arranged downstream of the tension roller (22) along the conveying direction of the pole piece (4).
5. The pole piece rolling device according to claim 4, characterized in that: The diameter of the tension roller (22) is greater than the diameters of the first balancing roller (21) and the second balancing roller (23), and the tension roller (22) is located in the middle and lower part or the middle and upper part of the first balancing roller (21) and the second balancing roller (23).
6. The pole piece rolling device according to claim 1, characterized in that: Along the conveying direction of the pole piece (4), the heating temperature of the heating roller assembly (3) is set in a climbing setting or a constant temperature setting, and the temperature range is 50-130°C.
7. The pole piece rolling device according to claim 6, characterized in that: The heating roller assembly (3) comprises: A first heating roller (31), a second heating roller (32), a third heating roller (33) and a fourth heating roller (34) are arranged in sequence and spaced apart along the conveying direction of the pole piece (4), and the first heating roller (31), the second heating roller (32), the third heating roller (33) and the fourth heating roller (34) are arranged in sequence and spaced apart, and the first heating roller (31) is located downstream of the stretching assembly (2).
8. The pole piece rolling device according to claim 7, characterized in that: The second heating roller (32) is located in the upper middle or lower middle of the first heating roller (31) and the third heating roller (33), and the third heating roller (33) is located in the lower middle or upper middle of the second heating roller (32) and the fourth heating roller (34).
9. The pole piece rolling device according to claim 7, characterized in that: The heating temperature of the first heating roller (31) is 70°C, the heating temperature of the second heating roller (32) is 75°C, the heating temperature of the third heating roller (33) is 80°C, and the heating temperature of the fourth heating roller (34) is 85°C.
10. The pole piece rolling device according to claim 7, characterized in that: The heating temperatures of the first heating roller (31), the second heating roller (32), the third heating roller (33) and the fourth heating roller (34) are all 80°C.