A dry electrode rolling device with controllable pressure roller gap

Abstract

The application relates to the technical field of electrode processing, and discloses a dry-process electrode rolling equipment with controllable pressure roller gap, which comprises pressure rollers, has an inner cavity, and is provided with at least two pressure rollers with a rolling gap between the two pressure rollers; a first contact piece is arranged in the inner cavity and is separately arranged with the pressure rollers; the first contact piece is provided with a first contact part which is in contact with the inner wall of the inner cavity; and the first contact part and the rolling gap are respectively located on the inner and outer sides of the roller wall of the pressure rollers. Through the technical scheme, the problems that the dry powder material is unevenly distributed in the prior art, the pressure rollers are deformed, the gap between the adjacent pressure rollers is reduced, the quality of the electrode film after forming is affected, and problems such as uneven thickness and uneven surface are caused are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrode processing, in particular to a dry electrode rolling device with controllable pressure roller gap. BACKGROUND

[0002] The traditional dry electrode rolling device is mainly used for compounding dry powder electrode active material (positive or negative) and current collector (usually copper foil or aluminum foil) to form an electrode film.

[0003] However, during the feeding process of dry powder material, due to the nature of the material itself, feeding method and other reasons, the material may not be evenly distributed, which may cause the thickness of the electrode film after rolling to be inconsistent, thereby affecting the energy density and cycle life of the battery.

[0004] The rolling width between adjacent pressure rollers in the traditional device is determined before processing, which means that once it is set, it cannot be adjusted during processing, limiting the flexibility of the device. When the thickness of the electrode film passing through is large, the pressure roller itself will deform by several microns to tens of microns under the huge rolling pressure, causing the gap between adjacent pressure rollers to decrease, affecting the quality of the electrode film after forming, and possibly causing uneven thickness, uneven surface and other problems. SUMMARY

[0005] The present application provides a dry electrode rolling device with controllable pressure roller gap, which solves the problem of uneven distribution of dry powder material in the related art, which causes the pressure roller to deform, reduces the gap between adjacent pressure rollers, and affects the quality of the electrode film after forming, which may cause uneven thickness, uneven surface and other problems.

[0006] The technical solution of the present application is as follows: a dry electrode rolling device with controllable pressure roller gap, comprising:

[0007] The pressure roller has an inner cavity, and the pressure roller is at least two, and has a rolling gap between the two pressure rollers;

[0008] The first touch piece is arranged in the inner cavity and is separately arranged with the pressure roller, the first touch piece has a first touch part, the first touch part touches the inner wall of the inner cavity, and the first touch part and the rolling gap are respectively located on the inner and outer sides of the roller wall of the pressure roller.

[0009] Optionally, it further comprises:

[0010] A second contact piece is arranged in the inner cavity of the compression roller with the two compression gaps on both sides and is located on one side of the first contact piece. The second contact piece has a second contact part which contacts the inner wall of the inner cavity. The second contact piece and the other compression gap are located on the inner and outer sides of the compression roller wall respectively.

[0011] Optionally, the application further comprises:

[0012] A first bearing seat is located on one side of the compression roller.

[0013] A rotating rod is arranged on the first bearing seat and extends into the inner cavity.

[0014] A support member has at least two support members which are arranged on the rotating rod in a spaced manner. The first contact piece is arranged on at least one of the support members and the second contact piece is arranged on the other support member.

[0015] Optionally, the first contact part and the second contact part are both arc-shaped and slide with the inner wall of the inner cavity. The support part has three support parts which are arranged in a fan-shaped and spaced manner.

[0016] Optionally, the support member is arranged on the rotating rod in a relative rotating manner. The support member has a first fixing hole and the rotating rod has a first fixing groove.

[0017] A first fastener passes through the first fixing hole and extends into the first fixing groove.

[0018] Optionally, the first contact piece and the second contact piece have a second fixing groove at one axial end.

[0019] A mounting seat is located on one side of the compression roller. The mounting seat has a plurality of second fixing holes.

[0020] A second fastener passes through the second fixing hole and extends into the second fixing groove.

[0021] Optionally, the application further comprises:

[0022] A second bearing seat is located on the other side of the compression roller. The compression roller is arranged on the second bearing seat in a rotating manner.

[0023] Optionally, the first contact part and the second contact part have an elastic layer and a contact layer. The contact layer contacts the inner wall of the inner cavity. The elastic layer is located on the side of the contact layer away from the inner wall of the inner cavity.

[0024] Optionally, the first touch piece and the second touch piece each have an air cavity, and an annular groove is formed between the mounting seat and the rotating rod, and the application further comprises:

[0025] An air pipe is arranged to communicate with the two air cavities and to extend through the annular groove and out of the inner cavity.

[0026] Optionally, the pressure roller has three pressure rollers, i.e., a first pressure roller, a second pressure roller and a third pressure roller, which are arranged in sequence and at intervals.

[0027] The first pressure roller and the second pressure roller are arranged at a forming gap, and the second pressure roller and the third pressure roller are arranged at a transfer gap.

[0028] The transfer gap is smaller than the width of the forming gap, and the width of the transfer gap and the forming gap is configured such that the electrode film is pressed when passing through the forming gap and the thickness of the electrode film is reduced after passing through the forming gap, and the electrode film is pressed when passing through the transfer gap and the thickness of the electrode film is not changed after passing through the transfer gap; the difference between the width of the transfer gap and the width of the forming gap / the width of the forming gap is a, and a≤8%.

[0029] The working principle and beneficial effects of the application are as follows:

[0030] In the application, the conventional pressure roller is a solid one-piece structure, and in the roller pressing process of the electrode film, the deformation occurring under the huge roller pressure is easily transmitted to the adjacent roller pressing gap. This deformation transmission will cause the gap between the adjacent pressure rollers to decrease, resulting in uneven thickness and uneven surface of the electrode film, which seriously affects the performance and service life of the battery. In long-term continuous production, the deformation of the solid pressure roller will gradually accumulate, resulting in a gradual decrease in the quality of the produced electrode film.

[0031] In the application, the pressure roller is internally designed with a cavity, the first touch piece is located in the inner cavity of the pressure roller, and the first touch piece and the pressure roller are separately arranged. The first touch piece can be stably supported by the frame located outside the pressure roller, and only the first touch part of the first touch piece is in contact with the inner cavity wall. Through the arrangement of the first touch piece, it can be ensured that the pressure roller can have stability close to that of the solid roller when bearing external force. This means that even if the pressure roller is internally hollow, it can provide stability comparable to that of a solid roller during normal roller pressing operation, thereby ensuring the stability and reliability of the electrode film roller pressing process.

[0032] Secondly, its core advantage is that it can significantly reduce the deformation transmission. When one side produces deformation due to uneven material supply, part of the deformation will be transmitted to the first touch piece and the related frame body connected with the first touch piece. The dispersion and transfer of this deformation effectively reduces the influence on the overall shape of the adjacent compression roller, thereby minimizing the influence on the adjacent roller compression gap width. Effectively solves the problem of deformation accumulation and quality decline of traditional solid compression rollers in long-time continuous production. BRIEF DESCRIPTION OF DRAWINGS

[0033] The above-mentioned characteristics, technical features, advantages and implementation ways of the present application will be further described in a clear and understandable manner in combination with the preferred embodiments and the accompanying drawings.

[0034] Fig. 1 The structure of the present application is shown in the figure;

[0035] Fig. 2 The structure of the single compression roller of the present application is shown in the figure;

[0036] Fig. 3 The internal structure of the compression roller of the present application is shown in the figure;

[0037] Fig. 4 The cross-sectional view of the first touch piece and the support piece of the present application is shown in the figure.

[0038] In the figure: 1, first compression roller; 2, second compression roller; 3, third compression roller; 4, compression roller; 401, inner cavity; 5, roller compression gap; 6, forming gap; 7, transfer gap; 8, support piece; 801, support part; 802, first fixed hole; 9, first touch piece; 901, first touch part; 10, composite gap; 11, second touch piece; 1101, second touch part; 12, mounting seat; 1201, second fixed hole; 13, first bearing seat; 14, second bearing seat; 15, air cavity; 16, annular groove; 17, air pipe; 18, rotating rod; 1801, first fixed groove; 19, elastic layer; 20, touch layer; 21, second fixed groove. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the specific embodiments of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0040] For the purpose of clarity, only the parts of the apparatus that are pertinent to the present application are shown in the drawings, and these do not necessarily represent the actual construction of the product. In addition, for the purpose of clarity and ease of understanding, in some of the drawings, only one of the components having the same structure or function is shown schematically, or only one of them is labeled. In this document, "one" means not only "only one", but also "more than one", and "several" includes "two" and "more than two".

[0041] In this document, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", and "linking" should be understood broadly, for example, they can be fixed connection, detachable connection, or integral connection; they can be mechanical connection, or electrical connection; they can be direct connection, or indirect connection through an intermediate medium; they can be internal connection of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In addition, in the description of the present application, the terms "first", "second", etc. are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0043] Reference Figs. 1-4 A dry electrode roll pressing device with controllable pressure roll gap is provided, comprising a pressure roller 4 having an inner cavity 401, the pressure roller 4 being at least two, and the two pressure rollers 4 having a roll pressing gap 5 therebetween; a first contact piece 9, the first contact piece 9 being arranged in the inner cavity 401 and being separate from the pressure roller 4, the first contact piece 9 having a first contact part 901, the first contact part 901 being in contact with the inner wall of the inner cavity 401, the first contact part 901 and the roll pressing gap 5 being respectively located on the inner and outer sides of the roll wall of the pressure roller 4.

[0044] The conventional pressure roller 4 is mostly a solid one-piece structure, and in the process of roll pressing of the electrode film, the deformation occurring under the huge roll pressing force is easily transmitted to the adjacent roll pressing gap 5. This deformation transmission will cause the gap of the adjacent pressure roller 4 to decrease, resulting in uneven thickness and uneven surface of the electrode film, which seriously affects the performance and service life of the battery. In long-term continuous production, the deformation of the solid pressure roller 4 will gradually accumulate, resulting in gradual decline in the quality of the electrode film produced.

[0045] In this embodiment, the pressure roller 4 is designed with a cavity inside, and the first contact piece 9 is located in the inner cavity 401 of the pressure roller 4 and is separately arranged with the pressure roller 4. The first contact piece 9 can be stably supported by the frame or the like located outside the pressure roller 4, and only the first contact part 901 is in contact with the wall of the inner cavity 401. Through the arrangement of the first contact piece 9, it can be ensured that the pressure roller 4 can have the stability close to the solid roller when bearing external force. This means that even if the inside of the pressure roller 4 is a cavity structure, it can provide stability comparable to a solid roller during normal roller pressing operation, thereby ensuring the stability and reliability of the electrode membrane roller pressing process.

[0046] Secondly, its core advantage is that it can significantly reduce deformation transmission. When one side deforms due to uneven material supply, part of the deformation will be transmitted to the first contact piece 9 and the related frame connected with the first contact piece 9. This dispersion and transfer of deformation effectively reduces the impact on the overall shape of the adjacent pressure roller 4, and further maximizes the impact on the width of the adjacent roller pressing gap 5. Effectively solve the problem of deformation accumulation and quality decline existing in the traditional solid pressure roller 4 in long-time continuous production.

[0047] Further, it also includes: a second contact piece 11, the second contact piece 11 is arranged in the inner cavity 401 of the pressure roller 4 with the roller pressing gap 5 on both sides, and is located on one side of the first contact piece 9. The second contact piece 11 has a second contact part 1101, which is in contact with the inner wall of the inner cavity 401. The second contact piece 11 and the other roller pressing gap 5 are respectively located on the inner and outer sides of the roller wall of the pressure roller 4.

[0048] In this embodiment, during the roller pressing production process of the electrode membrane, usually a plurality of pressure rollers 4 are arranged to work cooperatively to realize the circulation of roller pressing and conveying. The special position of the pressure roller 4 located in the middle determines that it has two roller pressing gaps 5 on both sides. In the traditional roller pressing production process, as the roller pressing process advances, the width of the roller pressing gap 5 will gradually decrease. When the electrode membrane passes through each roller pressing gap 5, it will be subjected to corresponding roller pressing processing, so that its thickness gradually decreases to meet the expected specification and performance requirements.

[0049] Since the pressure roller 4 located in the middle of the plurality of pressure rollers 4 will participate in the roller pressing processing on both sides, it means that the pressure roller 4 will be subjected to force on both sides during work. Compared with other position pressure rollers 4, it has a higher possibility of being affected by deformation, and this influence is often more significant.

[0050] In order to improve the adaptability of the pressure roller 4 in complex working environment, a second touch piece 11 is specially designed. The working principle of the second touch piece 11 is the same as that of the first touch piece 9, but the position is different. The second touch piece 11 is located on one side of the first touch piece 9, and its specific position can be flexibly adjusted according to the actual roller pressing gap 5 position. As a preferred solution, the second touch piece 11 should be arranged towards the roller pressing gap 5, which can more directly and sensitively feel the pressure change.

[0051] As a possible reference solution, pressure sensors can be added at appropriate positions of the first touch piece 9 and the second touch piece 11, and a control system is connected to monitor and adjust in real time through pressure detection. When one side of the pressure roller 4 causes abnormal pressure due to uneven material distribution, roller pressing speed change and other factors, the touch piece at the corresponding position can quickly perceive and transmit the signal to the control system. After receiving the signal, the control system will timely adjust the pressure distribution of the pressure roller 4 or the width of the roller pressing gap 5, thereby effectively reducing the deformation of the pressure roller 4 caused by abnormal pressure. This cooperative working mode greatly improves the adaptability of the pressure roller 4 to complex working conditions, and guarantees the thickness uniformity and surface flatness of the electrode diaphragm during the roller pressing process. Only for directional reference, the detailed implementation is not described here.

[0052] Further, 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 arranged on the first bearing seat 13 and extends into the inner cavity 401; at least two support pieces 8, the at least two support pieces 8 are spaced apart and sleeved on the rotating rod 18, and have support parts 801, the first touch piece 9 is arranged on at least one of the support pieces 8, and the second touch piece 11 is arranged on at least one of the support pieces 8.

[0053] In this embodiment, in the overall structure design of the device, the first bearing seat 13 is located on one side of the pressure roller 4, playing a key role in supporting and positioning. 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.

[0054] The support piece 8 is an important part of connection and support, and the number is at least two, and is spaced apart and sleeved on the rotating rod 18. Each support piece 8 has a support part 801 for stably mounting and fixing the first touch piece 9 or the second touch piece 11. As a preferred solution, in order to enhance stability and reliability, the first touch piece 9 is arranged on two or more support pieces 8 through the support part 801, and the arrangement mode of the second touch piece 11 is the same. The adjacent support pieces 8 are kept at a certain interval, which can significantly improve the stability of the support and effectively reduce the stress concentration.

[0055] In the scheme, when the rotating rod 18 rotates, the first contact piece 9 and the second contact piece 11 can be driven to rotate synchronously by the support 8, so as to flexibly adjust the positions of the first contact piece 9 and the second contact piece 11 in the inner cavity 401 of the compression roller 4.

[0056] In addition, during the shutdown of the equipment, the compression roller 4 remains in a stationary state, and at this time, the rotating rod 18 is rotated by a motor drive or the like, which can drive the first contact piece 9 and the second contact piece 11 to rotate. During this rotation, the first contact piece 9 and the second contact piece 11 can comprehensively cover and touch the inner cavity 401 of the compression roller 4. If there is a partial deformation in the compression roller 4, a pressure sensor can be arranged on the contact piece to detect the deformation.

[0057] For example, in the actual processing process, if one side of the compression roller 4 is subjected to uneven pressure, local micro-deformation may occur. At this time, the position adjustment of the first contact piece 9 and the second contact piece 11 driven by the rotation of the rotating rod 18 can effectively disperse and balance the pressure, thereby reducing the deformation of the compression roller 4 and ensuring the stability and consistency of the rolling effect.

[0058] During the shutdown detection, due to the operability of the rotating rod 18, each part of the inner cavity 401 of the compression roller 4 can be comprehensively detected. If potential deformation or damage occurs in a position that is difficult to directly observe, the feedback of the pressure sensor can timely discover and take corresponding maintenance measures to avoid causing more serious problems in subsequent production.

[0059] In summary, this design significantly reduces the deformation of the compression roller 4 during processing, and also fully plays a detection function during shutdown, thereby providing a strong guarantee for stable operation of the equipment and high-quality production.

[0060] Further, the first contact part 901 and the second contact part 1101 are both arc-shaped and slide and touch the inner wall of the inner cavity 401, and the support part 801 has three parts and is distributed in a fan-shaped manner.

[0061] In the embodiment, the first contact part 901 and the second contact part 1101 are both arc-shaped, which can realize more close and smooth sliding and touching 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 part in contact with the inner wall of the inner cavity 401.

[0062] The support parts 801 are three in number and are arranged in a fan-shaped interval distribution mode, the shape of the fan is adapted to the shape of the arc-shaped contact part, so that the support structure is more fitted and stable. Secondly, the interval distribution of the three support parts 801 can effectively disperse stress, avoid stress concentration in a certain point or place, and further improve the stability and durability of the whole support system, providing strong technical support for efficient and high-quality production.

[0063] Further, the support part 8 is rotatably sleeved on the rotating rod 18, the support part 8 has a first fixing hole 802, and the rotating rod 18 has a first fixing groove 1801; further comprising: a first fastener, the first fastener passes through the first fixing hole 802 and extends into the first fixing groove 1801; the first contact part 9 and the second contact part 11 each have a second fixing groove 21 at one end in the axial direction, and further comprising: a mounting seat 12, the mounting seat 12 is located on one side of the compression roller 4, 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 compression roller 4, and the compression roller 4 is rotatably arranged on the second bearing seat 14.

[0064] In this embodiment, the situation of the roller pressing seam 5 in different positions is applied, and the compression roller 4 in the traditional compression roller 4 device has various arrangement modes, such as horizontal arrangement, staggered arrangement, etc., so the position adaptability of the first contact part 9 and the second contact part 11 needs to be improved, and the implementation process of the present scheme is as follows:

[0065] After the first contact part 9 and the second contact part 11 are arranged on the support part 8, the support part 8 connected with the first contact part 9 is called the first support part 8, and the support part 8 connected with the second contact part 11 is called the second support part 8. The first support part 8 can be fixed on the rotating rod 18 by the first fastener, and the first support part 8 and the first contact part 9 will rotate synchronously with the rotating rod 18. Correspondingly, the second support part 8 is only rotatably sleeved on the rotating rod 18 and does not use the first fastener for position fixing, so it will not rotate with the rotating rod 18. At this time, the rotating rod 18 will drive the first contact part 9 to move close to or away from the second contact part 11 after rotating, so as to adjust the position of the two contact parts and adapt to the roller pressing seam 5 in different positions. The second contact part 11 is supported on the mounting seat 12 through the second fastener after the position adjustment is appropriate. The first fastener and the second fastener can be fixed pins and the like, which are conventional means and will not be described and shown in the description and drawings.

[0066] Further, the first contact part 901 and the second contact part 1101 each have an elastic layer 19 and a contact layer 20, the contact layer 20 is in contact with the inner wall of the inner cavity 401, and the elastic layer 19 is located on the side away from the inner wall of the inner cavity 401 of the contact layer 20.

[0067] 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 a polymer material, to ensure that it can stably and low-resistance touch the inner wall of the inner cavity 401. On the side of the touch layer 20 away from the inner wall of the inner cavity 401, an elastic layer 19 is installed or bonded. The elastic layer 19 is usually made of a material with good elastic recovery performance. 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, acting as a buffer.

[0068] The touch layer 20 directly touches the inner wall of the inner cavity 401, which can more sensitively perceive small changes in pressure and deformation, so as to make timely adjustments to ensure the quality of the electrode membrane sheet. The presence of the elastic layer 19 can effectively absorb and buffer the impact of external force, reducing damage to the touch part and the pressure roller 4, and prolonging the service life of the equipment. If the touch layer 20 or the elastic layer 19 is worn or damaged, it can be replaced individually, 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 the maintenance cost, providing a strong guarantee for efficient and high-quality electrode membrane sheet production.

[0069] Further, the first touch piece 9 and the second touch piece 11 each have an air cavity 15, and the mounting seat 12 and the rotating rod 18 form an annular groove 16 therebetween, and further comprising: an air pipe 17, the air pipe 17 being in communication with the two air cavities 15 and extending out of the inner cavity 401 through the annular groove 16. In this embodiment, the temperature of the first touch piece 9 and the second touch piece 11 can be adjusted by supplying cold air or hot air into the air cavity 15, thereby affecting the local temperature of the pressure roller 4, which is helpful to control the temperature conditions of the electrode membrane sheet during the rolling process, improve the product quality, and provide effective support for the performance optimization and stable operation of the dry electrode rolling equipment.

[0070] Further, the pressure roller 4 has three, which are the first pressure roller 41, the second pressure roller 42 and the third pressure roller 43, and the first pressure roller 41, the second pressure roller 42 and the third pressure roller 43 are arranged in sequence with intervals.

[0071] The first pressure roller 41 and the second pressure roller 42 are arranged with a forming gap 6 therebetween, and the second pressure roller 42 and the third pressure roller 43 are arranged with a transfer gap 7 therebetween.

[0072] The transfer gap 7 is smaller than the width of the forming gap 6, and the width of the transfer gap 7 and the forming gap 6 is configured such that the electrode membrane sheet is pressed when passing through the forming gap 6 and the thickness of the electrode membrane sheet after passing through the forming gap 6 is reduced, and the electrode membrane sheet is pressed when passing through the transfer gap 7 and the thickness of the electrode membrane sheet after passing through the transfer gap 7 is unchanged; the difference between the width of the transfer gap 7 and the width of the forming gap 6 / the width of the forming gap 6 is a, and a≤8%.

[0073] In this embodiment, the lithium battery dry powder material first enters the forming gap 6. After being processed by the forming gap 6, the electrode film 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 the width and pressure, the electrode film maintains pressure balance when passing through the gap, so that smooth transfer can be realized without changing the thickness.

[0074] For example, when the electrode film passes through a gap with a thickness difference ≥ 50 μm, it will break through the elastic change range and be extruded to be thin. Taking the width of the forming gap 6 as 200 μm, the thickness of the electrode film passing through the forming gap 6 is greater than 200 μm, and the width of the transfer gap 7 can be set to 190-195 μm, which is slightly smaller than the width of the forming gap 6, and the difference between the width of the forming gap 6 and the width of the transfer gap 7 is 5-10 μm, wherein a = (5-10) / 200 = 2.5%-5%.

[0075] (The change in the width of the electrode film is affected by many factors, such as the properties of the electrode material, the initial thickness, the accuracy and performance of the roller pressing equipment, and the control of process parameters, etc. Here, only a value actually measured for use is provided for reference). The value of a can be adjusted within the range of a ≤ 8% according to different processes, and the purpose is to make the electrode film only be subjected to the transfer force when passing through the transfer gap 7, and not be subjected to extrusion force or be subjected to slight extrusion force (which does not cause the thickness of the electrode film to change);

[0076] Taking the uniform range as 100 μm, the uneven thickness range of the lithium battery dry powder material is about 80 μm or less (usually smaller), and the thickness of the electrode film greater than the range of the forming gap 6 is: 100-180 μm. By default, the electrode roller with higher hardness and better rigidity is used, the diameter is larger, the support structure is stable, and the local deformation amount can be about 10 μm. That is, the width of the transfer gap 7 is about 180-185 μm, at this time, a = 7.5%-10%, the width difference between the transfer gap 7 and the forming gap 6 is ≤ 20 μm, and < 50 μm, and it will not break through the elastic change range and cause the electrode film to be extruded and thinned after the thickness is extruded. Therefore, during the working process of the second pressure roller 42, only one side close to the first pressure roller 41 participates in the extrusion of the electrode film, and the other side only plays a role in transferring the electrode film. Even if one side (forming gap 6) of the second pressure roller 42 is deformed due to uneven material, the other side (transfer gap 7) of the second pressure roller 42 can still ensure that the material is not extruded and thinned due to deformation, and only plays a role in transferring. The transferred electrode film can be further formed at the next forming position.

[0077] By setting the different functional forming gaps 6 and transfer gaps 7, the thickness change of the electrode membrane in the rolling process can be more accurately controlled, thereby improving the thickness consistency and quality stability of the product. Reasonable gap configuration enables the electrode membrane to realize continuous and efficient processing during the rolling process, reduces the rework and waste caused by improper thickness adjustment, and improves the overall production efficiency. Precise thickness control reduces material waste and improves product pass rate, thereby reducing production cost. In actual production, the electrode rolling processing equipment can produce electrode membranes with uniform thickness and excellent performance to meet the needs of high-end battery manufacturing. Compared with traditional rolling equipment, the product pass rate is increased by 15%, and the production efficiency is improved by 20%.

[0078] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, which should be covered by the scope of the claims of the present application.

Claims

1. A dry electrode rolling equipment with controllable pressure roller gap, characterized in that, include: The pressure roller (4) has an inner cavity (401), and there are at least two pressure rollers (4), with a roller gap (5) between the two pressure rollers (4); The first contact element (9) is disposed in the inner cavity (401) and is separately disposed from the pressure roller (4). The first contact element (9) has a first contact part (901). The first contact part (901) contacts the inner wall of the inner cavity (401). The first contact part (901) and the roller pressure gap (5) are respectively located on the inner and outer sides of the roller wall of the pressure roller (4). The second contact member (11) is disposed in the inner cavity (401) of the pressure roller (4) which has roller gaps (5) on both sides, and is located on one side of the first contact member (9). The second contact member (11) has a second contact part (1101) which contacts the inner wall of the inner cavity (401). The second contact member (11) and the other roller gap (5) are respectively located on the inner and outer sides of the roller wall of the pressure roller (4). The first bearing housing (13) is located on one side of the pressure roller (4); Rotating rod (18), which is rotatably mounted on the first bearing seat (13) and extends into the inner cavity (401); Support member (8), having at least two, at least two of the support members (8) are spaced apart and sleeved on the rotating rod (18), having a support portion (801), the first contact member (9) is disposed on at least one of the support members (8), and the second contact member (11) is disposed on the other at least one of the support members (8); Both the first touch portion (901) and the second touch portion (1101) are arc-shaped and slide against the inner wall of the inner cavity (401). The support portion (801) has three parts and is distributed in a fan-shaped interval. The support member (8) is 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: The first fastener passes through the first fixing hole (802) and extends into the first fixing groove (1801).

2. The dry electrode rolling equipment with controllable pressure roller gap according to claim 1, characterized in that, Both the first contact member (9) and the second contact member (11) have a second fixing groove (21) at one axial end, and further include: Mounting seat (12), the mounting seat (12) is located on one side of the pressure roller (4), the mounting seat (12) has a plurality of second fixing holes (1201); The second fastener passes through the second fixing hole (1201) and extends into the second fixing groove (21).

3. The dry electrode rolling equipment with controllable pressure roll gap according to claim 1, characterized in that, Also includes: The second bearing seat (14) is located on the other side of the pressure roller (4), and the pressure roller (4) is rotatably mounted on the second bearing seat (14).

4. The dry electrode rolling equipment with controllable pressure roll gap according to claim 1, characterized in that, Both the first touch portion (901) and the second touch portion (1101) have an elastic layer (19) and a touch layer (20). The touch layer (20) touches the inner wall of the inner cavity (401), and the elastic layer (19) is located on the side of the touch layer (20) away from the inner wall of the inner cavity (401).

5. A dry electrode rolling equipment with controllable pressure roll gap according to claim 2, characterized in that, Both the first contact member (9) and the second contact member (11) have air chambers (15), and an annular groove (16) is formed between the mounting base (12) and the rotating rod (18). The device also includes: The trachea (17) communicates with the two air chambers (15) and passes through the annular groove (16), extending out of the inner cavity (401).

6. The dry electrode rolling equipment with controllable pressure roll gap according to claim 1, characterized in that, The pressure roller (4) has three parts, namely the first pressure roller (1), the second pressure roller (2) and the third pressure roller (3), which are arranged in sequence at intervals; There is a forming gap (6) between the first pressure roller (1) and the second pressure roller (2), and a transfer gap (7) between the second pressure roller (2) and the third pressure roller (3); The transfer gap (7) is smaller than the width of the forming gap (6), and the widths of the transfer gap (7) and the forming gap (6) are configured such that the electrode film is pressed and becomes thinner when passing through the forming gap (6), and is pressed and remains unchanged when passing through the transfer gap (7); the difference in width between the transfer gap (7) and the forming gap (6) / the width of the forming gap (6) is a, where a ≤ 8%.

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