Dry-method electrode rolling equipment with controllable pressure roll gap

Abstract

The invention relates to the technical field of electrode processing, and provides a dry electrode rolling device with a controllable pressure roll gap, which comprises at least two compression rollers with inner cavities, and a rolling gap is arranged between the two compression rollers; the first touch piece is arranged in the inner cavity, the first touch piece and the pressing roller are arranged in a split mode, the first touch piece is provided with a first touch part, the first touch part makes contact with the inner wall of the inner cavity, and the first touch part and the rolling seam are located on the inner side and the outer side of the roller wall of the pressing roller respectively. According to the technical scheme, the problems that in the prior art, dry powder materials are not uniformly distributed, so that the compression rollers deform, the gap between the adjacent compression rollers is reduced, the quality of the formed electrode diaphragm is influenced, the thickness is not uniform, the surface is not flat and the like are solved.

Description

Technical Field

[0001] The invention relates to the technical field of electrode processing, and in particular to dry electrode rolling equipment with controllable pressure roll gap. Background Art

[0002] Traditional dry electrode rolling equipment is mainly used to compound dry powdered electrode active materials (positive electrode or negative electrode) with current collectors (usually copper foil or aluminum foil) to form electrode membranes.

[0003] However, during the feeding process of dry powder materials, uneven material distribution may occur due to the properties of the material itself, the feeding method, etc., which will lead to inconsistent thickness of the electrode membrane after roller forming, thereby affecting the energy density and cycle life of the battery.

[0004] In traditional equipment, the rolling width between adjacent rollers is determined before processing, which means that once set, it cannot be adjusted during the processing, limiting the flexibility of the equipment. When the thickness of the electrode membrane passing through is large, the roller itself will produce deformation of several microns to tens of microns under the huge roller pressure, resulting in a decrease in the gap between adjacent rollers, affecting the quality of the electrode membrane after forming, and may cause problems such as uneven thickness and uneven surface. Summary of the invention

[0005] The present invention proposes a dry electrode rolling equipment with controllable pressure roller gap, which solves the problem in the related technology that the uneven distribution of dry powder materials causes the roller to deform, resulting in a reduction in the gap between adjacent rollers, affecting the quality of the electrode diaphragm after forming, and may cause uneven thickness, uneven surface, etc.

[0006] The technical solution of the present invention is as follows: A dry electrode rolling device with controllable pressure roll gap, comprising: A pressing roller having an inner cavity, wherein there are at least two pressing rollers, and a pressing gap is formed between the two pressing rollers; The first touching member is arranged in the inner cavity and is separate from the pressure roller. The first touching member has a first touching portion, which touches the inner wall of the inner cavity. The first touching portion and the roller pressing seam are respectively located on the inner and outer sides of the roller wall of the pressure roller.

[0007] Optionally, it also includes: The second touching member is arranged in the inner cavity of the pressing roller having the pressing seams on both sides and is located on one side of the first touching member. The second touching member has a second touching portion, and the second touching portion touches the inner wall of the inner cavity. The second touching member and the other pressing seam are respectively located on the inner and outer sides of the roller wall of the pressing roller.

[0008] Optionally, it also includes: A first bearing seat, wherein the first bearing seat is located at one side of the pressure roller; A rotating rod, which is rotatably disposed on the first bearing seat and extends into the inner cavity; The supporting members include at least two, wherein the at least two supporting members are sleeved on the rotating rod at intervals and have supporting parts, the first touching member is arranged on at least one of the supporting members, and the second touching member is arranged on at least another supporting member.

[0009] Optionally, the first contact portion and the second contact portion are both arc-shaped and slidably contact the inner wall of the inner cavity, and the number of the supporting portions is three and they are spaced apart in a fan shape.

[0010] Optionally, the support member is relatively rotatably sleeved on the rotating rod, the support member has a first fixing hole, and the rotating rod has a first fixing groove; further comprising: A first fastener passes through the first fixing hole and extends into the first fixing groove.

[0011] Optionally, one axial end of each of the first contact member and the second contact member has a second fixing groove, and further includes: A mounting seat, the mounting seat is located on one side of the pressure roller, and the mounting seat has a plurality of second fixing holes; A second fastener passes through the second fixing hole and extends into the second fixing groove.

[0012] Optionally, it also includes: A second bearing seat, wherein the second bearing seat is located at the other side of the pressure roller, and the pressure roller is rotatably arranged on the second bearing seat.

[0013] Optionally, the first touching portion and the second touching portion both have an elastic layer and a touching layer, the touching layer touches the inner wall of the inner cavity, and the elastic layer is located on a side of the touching layer away from the inner wall of the inner cavity.

[0014] Optionally, the first contact member and the second contact member both have an air cavity, an annular groove is formed between the mounting seat and the rotating rod, and further comprises: The trachea is communicated with the two air cavities, passes through the annular groove, and extends out of the inner cavity.

[0015] Optionally, there are three pressing rollers, namely a first pressing roller, a second pressing roller and a third pressing roller, and the first pressing roller, the second pressing roller and the third pressing roller are arranged in sequence at intervals; There is a forming gap between the first pressing roller and the second pressing roller, and there is a transfer gap between the second pressing roller and the third pressing roller. The transfer gap is smaller than the width of the molding gap, and the widths of the transfer gap and the molding gap are configured so that the electrode diaphragm is pressed when passing through the molding gap and its thickness becomes thinner after passing through, and is pressed when passing through the transfer gap and its thickness remains unchanged after passing through; the difference in width between the transfer gap and the molding gap / the width of the molding gap is a, a≤8%.

[0016] The working principle and beneficial effects of the present invention are: In the present invention, most of the conventional rollers are solid integrated structures. During the rolling process of the electrode membrane, the deformation is easily transferred to the adjacent rolling gap under the huge roller pressure. This deformation transfer will cause the gap between adjacent rollers to decrease, resulting in uneven thickness and uneven surface of the electrode membrane, which seriously affects the performance and life of the battery. In long-term continuous production, the deformation of the solid roller will gradually accumulate, resulting in a gradual decline in the quality of the produced electrode membrane.

[0017] In the present invention, a cavity is designed inside the pressure roller, and the first touch member is located in the inner cavity of the pressure roller and is separately arranged from the pressure roller. The first touch member can be stably supported by a frame located outside the pressure roller, and only contacts the inner cavity wall through its first touch portion. The arrangement of the first touch member can ensure that the pressure roller with a cavity can maintain stability close to that of a solid roller when subjected to external force. This means that in normal rolling operation, even if the pressure roller has a cavity structure inside, it can provide stability performance equivalent to that of a solid roller, thereby ensuring the stability and reliability of the electrode membrane rolling process.

[0018] Secondly, its core advantage is that it can significantly reduce deformation transfer. When one side is deformed due to uneven material supply, part of the deformation will be transferred to the first contact member and the related frame connected to the first contact member. This dispersion and transfer of deformation effectively reduces the impact on the overall shape of adjacent rollers, thereby minimizing the impact on the width of the adjacent roller press seam. It effectively solves the problem of deformation accumulation and quality degradation of traditional solid rollers in long-term continuous production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0020] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of a single pressing roller of the present invention; Figure 3 This is a schematic diagram of the internal structure of the pressure roller of the present invention; Figure 4 It is a cross-sectional schematic diagram of the first touching member and the supporting member of the present invention.

[0021] In the figure: 1, first pressing roller; 2, second pressing roller; 3, third pressing roller; 4, pressing roller; 401, inner cavity; 5, roller pressing seam; 6, forming gap; 7, transfer gap; 8, support member; 801, support part; 802, first fixing hole; 9, first touching member; 901, first touching part; 10, composite gap; 11, second touching member; 1101, second touching part; 12, mounting seat; 1201, second fixing hole; 13, first bearing seat; 14, second bearing seat; 15, air cavity; 16, annular groove; 17, air pipe; 18, rotating rod; 1801, first fixing groove; 19, elastic layer; 20, touching layer; 21, second fixing groove. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0023] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0024] In this document, it should be noted that, 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] Reference Figure 1~Figure 4A dry electrode rolling device with controllable pressure roller gap is proposed, comprising: a pressing roller 4 having an inner cavity 401, at least two pressing rollers 4, and a rolling gap 5 between the two pressing rollers 4; a first touching member 9, the first touching member 9 is arranged in the inner cavity 401, and is separated from the pressing roller 4, the first touching member 9 has a first touching portion 901, the first touching portion 901 touches the inner wall of the inner cavity 401, and the first touching portion 901 and the rolling gap 5 are respectively located on the inner and outer sides of the roller wall of the pressing roller 4.

[0027] Conventional rollers 4 are mostly solid integrated structures. During the rolling process of the electrode membrane, the deformation is easily transferred to the adjacent rolling gap 5 under the huge roller pressure. This deformation transfer will cause the gap between adjacent rollers 4 to decrease, resulting in uneven thickness and uneven surface of the electrode membrane, which seriously affects the performance and life of the battery. In long-term continuous production, the deformation of the solid roller 4 will gradually accumulate, resulting in a gradual decline in the quality of the produced electrode membrane.

[0028] In this embodiment, a cavity is designed inside the pressure roller 4, and the first touch member 9 is located in the inner cavity 401 of the pressure roller 4, and is separately arranged from the pressure roller 4. The first touch member 9 can be stably supported by a frame or the like located outside the pressure roller 4, and only contacts the wall of the inner cavity 401 through its first touch portion 901. The arrangement of the first touch member 9 can ensure that the pressure roller 4 with a cavity can maintain stability close to that of a solid roller when subjected to external force. This means that in normal rolling operation, even if the pressure roller 4 has a cavity structure inside, it can provide stability comparable to that of a solid roller, thereby ensuring the stability and reliability of the electrode membrane rolling process.

[0029] Secondly, its core advantage is that it can significantly reduce deformation transfer. When one side is deformed due to uneven material supply, part of the deformation will be transferred to the first contact member 9 and the related frame connected to the first contact member 9. This dispersion and transfer of deformation effectively reduces the impact on the overall shape of the adjacent rollers 4, thereby minimizing the impact on the width of the adjacent roller press seam 5. It effectively solves the problem of deformation accumulation and quality degradation of the traditional solid roller 4 in long-term continuous production.

[0030] Furthermore, it also includes: a second touch member 11, the second touch member 11 is arranged in the inner cavity 401 of the pressure roller 4 with roller-pressed seams 5 on both sides, and is located on one side of the first touch member 9, the second touch member 11 has a second touch portion 1101, the second touch portion 1101 touches the inner wall of the inner cavity 401, and the second touch member 11 and another roller-pressed seam 5 are respectively located on the inner and outer sides of the roller wall of the pressure roller 4.

[0031] In this embodiment, during the rolling production process of the electrode membrane, a plurality of pressing rollers 4 are usually arranged to work together to achieve cyclic rolling conveying. The special position of the pressing roller 4 located in the middle determines that there are two rolling seams 5 on both sides of it. In the traditional rolling production process, as the rolling process proceeds, the width of the rolling seam 5 will gradually decrease. When the electrode membrane passes through each rolling seam 5, it will be subjected to corresponding rolling processing, so that its thickness will gradually decrease to meet the expected specifications and performance requirements.

[0032] Since both sides of the roller 4 located in the middle of the plurality of rollers 4 are involved in the rolling process, this means that both sides of the roller 4 are subjected to force during operation. Compared with the rollers 4 at other positions, it is more likely to be affected by deformation, and this effect is often more significant.

[0033] In order to improve the adaptability of this type of pressure roller 4 in a complex working environment, a second touch member 11 is specially designed. The second touch member 11 has the same working principle as the first touch member 9, but is located in a different position. The second touch member 11 is located on one side of the first touch member 9, and its specific position can be flexibly adjusted according to the actual position of the roller press seam 5. As a preferred solution, the second touch member 11 should be arranged toward the roller press seam 5, so that the pressure change can be felt more directly and sensitively.

[0034] As a possible reference solution, pressure sensors can be added to the appropriate positions of the first touch member 9 and the second touch member 11, and connected to the control system. Real-time monitoring and adjustment can be performed through pressure detection. When the pressure on one side of the pressure roller 4 is abnormal due to factors such as uneven material distribution and changes in rolling speed, the touch member at the corresponding position can quickly sense and transmit the signal to the control system. After receiving the signal, the control system will adjust the pressure distribution of the pressure roller 4 or the width of the rolling seam 5 in time, thereby effectively reducing the deformation of the pressure roller 4 caused by abnormal pressure. This collaborative working method greatly improves the adaptability of the pressure roller 4 to complex working conditions and ensures the thickness uniformity and surface flatness of the electrode diaphragm during the rolling process. It is only for directional reference and no detailed description of the implementation method is given here.

[0035] Furthermore, it also includes: a first bearing seat 13, the first bearing seat 13 is located on one side of the pressure roller 4; a rotating rod 18, the rotating rod 18 is rotatably set on the first bearing seat 13 and extends into the inner cavity 401; a support member 8, having at least two, at least two support members 8 are spaced apart and sleeved on the rotating rod 18, and have a supporting portion 801, the first touch member 9 is set on at least one of the support members 8, and the second touch member 11 is set on at least one other support member 8.

[0036] In this embodiment, in the structural design of the entire device, the first bearing seat 13 is located on one side of the pressure roller 4, playing a key supporting and positioning role. The rotating rod 18 is rotatably arranged on the first bearing seat 13 and extends into the inner cavity 401 of the pressure roller 4.

[0037] As an important component for connection and support, the number of support members 8 is at least two, and they are sleeved on the rotating rod 18 in an interval manner. Each support member 8 has a support portion 801 for stably installing and fixing the first touch member 9 or the second touch member 11. As a preferred solution, in order to enhance stability and reliability, the first touch member 9 is arranged on two or more support members 8 through the support portion 801, and the second touch member 11 is arranged in the same manner. A certain spacing distance is maintained between adjacent support members 8. Such a design can significantly improve the stability of the support and effectively reduce stress concentration.

[0038] In this solution, when the rotating rod 18 rotates, the first contact member 9 and the second contact member 11 can be driven to rotate synchronously through the supporting member 8, so as to flexibly adjust the positions of the first contact member 9 and the second contact member 11 in the inner cavity 401 of the pressure roller 4.

[0039] In addition, during the shutdown of the equipment, the pressure roller 4 remains stationary, and the rotating rod 18 is rotated by a motor drive or the like, which can drive the first touch member 9 and the second touch member 11 to rotate. During this rotation process, the first touch member 9 and the second touch member 11 can fully cover and touch the inner cavity 401 of the pressure roller 4. If there is deformation at some position inside the pressure roller 4, it can also be detected by setting a pressure sensor on the touch member.

[0040] For example, in the actual processing, if one side of the pressing roller 4 is subjected to uneven pressure, local slight deformation may occur. At this time, the rotation of the rotating rod 18 drives the position adjustment of the first contact member 9 and the second contact member 11, which can effectively disperse and balance the pressure, thereby reducing the deformation of the pressing roller 4 and ensuring the stability and consistency of the rolling effect.

[0041] During the shutdown inspection, due to the operability of the rotating rod 18, all parts of the inner cavity 401 of the pressure roller 4 can be comprehensively inspected. If potential deformation or damage occurs at a position that is difficult to directly observe, the feedback from the pressure sensor can be used to timely discover and take corresponding maintenance measures to avoid causing more serious problems in subsequent production.

[0042] In summary, this design significantly reduces the deformation of the pressure roller 4 during the processing, and fully plays the detection function during the shutdown process, providing a strong guarantee for the stable operation of the equipment and high-quality production.

[0043] Furthermore, the first contact portion 901 and the second contact portion 1101 are both arc-shaped, and slide in contact with the inner wall of the inner cavity 401 , and the supporting portions 801 have three portions and are spaced apart in a fan shape.

[0044] In this embodiment, the first touch portion 901 and the second touch portion 1101 both adopt an arc-shaped design. This arc-shaped shape can achieve a tighter and smoother sliding touch with the inner wall of the inner cavity 401, and can better disperse and withstand pressure, thereby enhancing the stability and reliability of the contact between the touch portion and the inner wall of the inner cavity 401.

[0045] There are three support parts 801, which are arranged in a fan-shaped distribution. The fan-shaped shape is adapted to the arc-shaped contact part, making the support structure more fit and stable. Secondly, the spacing distribution of the three support parts 801 can effectively disperse the stress and avoid stress concentration at a certain point or a certain place, thereby further improving the stability and durability of the entire support system, and providing strong technical support for efficient and high-quality production.

[0046] Furthermore, the support member 8 is relatively rotatably sleeved on the rotating rod 18, the support member 8 has a first fixing hole 802, and the rotating rod 18 has a first fixing groove 1801; it also includes: a first fastener, the first fastener passes through the first fixing hole 802 and extends into the first fixing groove 1801; the first touch member 9 and the second touch member 11 both have a second fixing groove 21 at one axial end, and also includes: a mounting seat 12, the mounting seat 12 is located on one side of the pressure roller 4, and the mounting seat 12 has a plurality of second fixing holes 1201; a second fastener, the second fastener passes through the second fixing hole 1201 and extends into the second fixing groove 21; a second bearing seat 14, the second bearing seat 14 is located on the other side of the pressure roller 4, and the pressure roller 4 is rotatably arranged on the second bearing seat 14.

[0047] In this embodiment, the roller pressing seam 5 at different positions is applicable. The rollers 4 in the conventional pressing roller 4 device have multiple arrangement modes, such as horizontal arrangement, staggered arrangement, etc. Therefore, it is necessary to improve the position adaptability of the first contact member 9 and the second contact member 11. The implementation process of this solution is as follows: After the first touch member 9 and the second touch member 11 are arranged on the support member 8, the support member 8 connected with the first touch member 9 is called the first support member 8, and the support member 8 connected with the second touch member 11 is called the second support member 8. The first support member 8 can be fixed on the rotating rod 18 by the first fastener, and the first support member 8 and the first touch member 9 will rotate synchronously with the rotating rod 18. Correspondingly, the second support member 8 is only rotatably sleeved on the rotating rod 18, and the first fastener is not used for position fixation, and it will not rotate with the rotating rod 18. At this time, after the rotating rod 18 rotates, it will drive the first touch member 9 to approach or move away from the second touch member 11 to adjust the positions of the two touch members to adapt to the roller-pressed seam 5 in different positions. The support of the second touch member 11 is that after the position is adjusted appropriately, it is fixed to the mounting seat 12 by the second fastener, wherein the first fastener and the second fastener can be fixed pins, etc., which are conventional means and are not described or shown in the instructions and drawings.

[0048] Furthermore, the first touching portion 901 and the second touching portion 1101 both have an elastic layer 19 and a touch layer 20 . The touch layer 20 touches the inner wall of the inner cavity 401 . The elastic layer 19 is located on a side of the touch layer 20 away from the inner wall of the inner cavity 401 .

[0049] In this embodiment, the touch layer 20 is made of a material with good wear resistance and low friction coefficient, such as a special alloy or polymer material, to ensure that it can stably and low-resistance touch the inner wall of the inner cavity 401. The elastic layer 19 is installed or bonded on the side of the touch layer 20 away from the inner wall of the inner cavity 401. The elastic layer 19 is usually made of a material with good elastic recovery properties. In actual equipment operation, when the pressure roller 4 is deformed by external force, the touch layer 20 first contacts the inner wall of the inner cavity 401 to sense the pressure and deformation. At the same time, the elastic layer 19 can absorb part of the energy generated by the pressure and deformation, and play a buffering role.

[0050] The touch layer 20 directly touches the inner wall of the inner cavity 401, and can more keenly perceive tiny pressure changes and deformations, so as to make timely adjustments to ensure the rolling quality of the electrode diaphragm. The presence of the elastic layer 19 can effectively absorb and buffer external force impacts, reduce damage to the touch part and the pressure roller 4, and extend the service life of the equipment. If the touch layer 20 or the elastic layer 19 is worn or damaged, they can be replaced separately, reducing maintenance costs and time. In summary, the design of the elastic layer 19 and the touch layer 20 of the first touch part 901 and the second touch part 1101 not only improves the performance and stability of the equipment, but also reduces maintenance costs, providing a strong guarantee for efficient and high-quality electrode diaphragm production.

[0051] Furthermore, the first touch member 9 and the second touch member 11 both have an air cavity 15, an annular groove 16 is formed between the mounting seat 12 and the rotating rod 18, and also include: an air pipe 17, the air pipe 17 is connected with the two air cavities 15, passes through the annular groove 16, and extends out of the inner cavity 401. In this embodiment, the temperature of the first touch member 9 and the second touch member 11 can be adjusted by delivering cold air or hot air into the air cavity 15, thereby affecting the local temperature of the pressing roller 4, which helps to control the temperature condition of the electrode membrane during the rolling process, improve product quality, and provide effective support for the performance optimization and stable operation of the dry electrode rolling equipment.

[0052] Furthermore, there are three pressing rollers 4, namely a first pressing roller 41, a second pressing roller 42 and a third pressing roller 43, and the first pressing roller 41, the second pressing roller 42 and the third pressing roller 43 are arranged in sequence at intervals; There is a forming gap 6 between the first pressing roller 41 and the second pressing roller 42, and there is a transfer gap 7 between the second pressing roller 42 and the third pressing roller 43. The transfer gap 7 is smaller than the width of the molding gap 6, and the widths of the transfer gap 7 and the molding gap 6 are configured so that the electrode diaphragm is pressed when passing through the molding gap 6 and its thickness becomes thinner after passing through, and is pressed when passing through the transfer gap 7 and its thickness remains unchanged after passing through; the difference in width between the transfer gap 7 and the molding gap 6 / the width of the molding gap 6 is a, a≤8%.

[0053] In this embodiment, the lithium battery dry powder material first enters the forming gap 6. The electrode membrane processed by the forming gap 6 continues to move forward and enters the transfer gap 7. Although the transfer gap 7 is smaller than the forming gap 6, due to the special configuration of its width and pressure, the electrode membrane maintains pressure balance when passing through the gap, so that a smooth transfer can be achieved without changing the thickness.

[0054] Taking the example that when the electrode diaphragm passes through a gap with a thickness difference of ≥50μm, it will exceed its elastic variation range and be squeezed and thinned. For example, the width of the molding gap 6 is 200μm. The thickness of the electrode diaphragm passing through the molding gap 6 must be greater than 200μm. The width of the transfer gap 7 can be set to 190-195μm, which is slightly smaller than the width of the molding gap 6. The difference with the width of the molding gap 6 is 5-10μm, where a=(5~10) / 200=2.5%~5%.

[0055] (The change in the width of the electrode membrane is affected by many factors, such as the properties of the electrode material, the initial thickness, the accuracy and performance of the rolling equipment, and the control of the process parameters, etc. Here, only a numerical value used in actual measurement is provided for reference.) The value of a can be adjusted within the range of a≤8% according to different processes, and its purpose is to make the electrode membrane only subject to the transfer force when passing through the transfer gap 7, without being subject to the squeezing force or being subject to a slight squeezing force (which does not cause the thickness of the electrode membrane to change); Taking the uniform range as 100μm, the uneven thickness range of lithium battery dry powder material is about 80μm or less (usually smaller), and the thickness of the electrode membrane greater than the range of the forming gap 6 is: 100-180μm. By default, the electrode roller with higher hardness and better rigidity is used, with a larger diameter and a stable supporting structure, and the local deformation may be around 10μm. That is, the width of the transfer gap 7 is about 180-185μm. At this time, a=7.5%-10%, the width difference between the transfer gap 7 and the forming gap 6 is ≤20μm, and <50μm, and it will not exceed its elastic variation range, causing the thickness of the electrode membrane to become thinner after extrusion. Because of this, during operation, the second roller 42 only participates in the extrusion of the electrode membrane on one side close to the first roller 41, and the other side only plays the role of transferring the electrode membrane. Even if one side (forming gap 6) of the second roller 42 is deformed due to uneven material, it can still be ensured that the other side (transfer gap 7) of the second roller 42 will not cause deformation and thinning of the material by extrusion, and only plays a transfer role. The transferred electrode membrane can be further formed at the next forming position.

[0056] By setting the forming gap 6 and transfer gap 7 with different functions, the thickness change of the electrode diaphragm during the rolling process can be controlled more accurately, thereby improving the thickness consistency and quality stability of the product. Reasonable gap configuration enables continuous and efficient processing of the electrode diaphragm during the rolling process, reduces rework and waste caused by improper thickness adjustment, and improves overall production efficiency. Accurate thickness control reduces material waste and improves product qualification rate, thereby reducing production costs. In actual production, the use of this electrode rolling processing equipment can produce electrode diaphragms with uniform thickness and excellent performance to meet the needs of high-end battery manufacturing. Compared with traditional rolling equipment, its product qualification rate has increased by 15% and production efficiency has increased by 20%.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A dry electrode rolling device with controllable pressure roll gap, characterized in that: include: A pressing roller (4) having an inner cavity (401), wherein there are at least two pressing rollers (4), and a pressing gap (5) is provided between the two pressing rollers (4); A first contact member (9), wherein the first contact member (9) is arranged in the inner cavity (401) and is arranged separately from the pressure roller (4), wherein the first contact member (9) has a first contact portion (901), wherein the first contact portion (901) contacts the inner wall of the inner cavity (401), and wherein the first contact portion (901) and the roller pressing seam (5) are respectively located on the inner and outer sides of the roller wall of the pressure roller (4).

2. The dry electrode rolling equipment with controllable pressure roll gap according to claim 1, characterized in that: Also includes: A second touching member (11), the second touching member (11) is arranged in the inner cavity (401) of the pressing roller (4) having the pressing slits (5) on both sides, and is located on one side of the first touching member (9), the second touching member (11) has a second touching portion (1101), the second touching portion (1101) touches the inner wall of the inner cavity (401), and the second touching member (11) and the other pressing slit (5) are respectively located on the inner and outer sides of the roller wall of the pressing roller (4).

3. The dry electrode rolling equipment with controllable pressure roll gap according to claim 2, characterized in that: Also includes: A first bearing seat (13), wherein the first bearing seat (13) is located on one side of the pressure roller (4); a rotating rod (18), the rotating rod (18) being rotatably disposed on the first bearing seat (13) and extending into the inner cavity (401); The support member (8) comprises at least two, wherein the at least two support members (8) are sleeved on the rotating rod (18) at intervals and have a supporting portion (801), wherein the first contact member (9) is arranged on at least one of the support members (8), and the second contact member (11) is arranged on at least another one of the support members (8).

4. The dry electrode rolling equipment with controllable pressure roll gap according to claim 3, characterized in that: The first contact portion (901) and the second contact portion (1101) are both arc-shaped and slidably contact the inner wall of the inner cavity (401). The supporting portions (801) are three and are spaced apart in a fan shape.

5. The dry electrode rolling equipment with controllable pressure roll gap according to claim 3, characterized in that: The support member (8) is relatively rotatably sleeved on the rotating rod (18), the support member (8) has a first fixing hole (802), and the rotating rod (18) has a first fixing groove (1801); and further comprises: A first fastener, the first fastener passes through the first fixing hole (802) and extends into the first fixing groove (1801).

6. The dry electrode rolling equipment with controllable pressure roll gap according to claim 3, characterized in that: The first contact member (9) and the second contact member (11) each have a second fixing groove (21) at one axial end thereof, and further include: A mounting seat (12), the mounting seat (12) being located on one side of the pressure roller (4), the mounting seat (12) having a plurality of second fixing holes (1201); A second fastener, the second fastener passes through the second fixing hole (1201) and extends into the second fixing groove (21).

7. The dry electrode rolling equipment with controllable pressure roll gap according to claim 5, characterized in that: Also includes: A second bearing seat (14), wherein the second bearing seat (14) is located at the other side of the pressure roller (4), and the pressure roller (4) is rotatably arranged on the second bearing seat (14).

8. The dry electrode rolling equipment with controllable pressure roll gap according to claim 2, characterized in that: The first touching portion (901) and the second touching portion (1101) both have an elastic layer (19) and a touching layer (20), the touching layer (20) touches the inner wall of the inner cavity (401), and the elastic layer (19) is located on a side of the touching layer (20) away from the inner wall of the inner cavity (401).

9. The dry electrode rolling equipment with controllable pressure roll gap according to claim 6, characterized in that: The first contact member (9) and the second contact member (11) both have an air cavity (15), an annular groove (16) is formed between the mounting seat (12) and the rotating rod (18), and further comprises: An air pipe (17), wherein the air pipe (17) is in communication with the two air cavities (15), passes through the annular groove (16), and extends out of the inner cavity (401).

10. The dry electrode rolling equipment with controllable pressure roll gap according to claim 1 or 2, characterized in that: The pressing rollers (4) have three parts, namely a first pressing roller (1), a second pressing roller (2) and a third pressing roller (3), and the first pressing roller (1), the second pressing roller (2) and the third pressing roller (3) are arranged in sequence and spaced apart; A forming gap (6) is formed between the first pressing roller (1) and the second pressing roller (2), and a transfer gap (7) is formed between the second pressing roller (2) and the third pressing roller (3). The transfer gap (7) is smaller than the width of the molding gap (6), and the widths of the transfer gap (7) and the molding gap (6) are configured such that the electrode diaphragm is pressed when passing through the molding gap (6) and its thickness becomes thinner after passing through, and is pressed when passing through the transfer gap (7) and its thickness remains unchanged after passing through; the difference in width between the transfer gap (7) and the molding gap (6) / the width of the molding gap (6) is a, and a≤8%.

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