Pole piece rolling device

Abstract

The utility model relates to the technical field of lithium battery production, and particularly discloses a pole piece rolling device which comprises a rack, a first roller, a second roller and a rotating assembly, the first roller and the second roller are oppositely arranged to form a rolling channel; first bearing seats are arranged at the two ends of the first roller, and the sides, back to the rolling channel, of the first bearing seats are movably connected with the rack through rotating assemblies; second bearing seats are arranged at the two ends of the second roller correspondingly, and the sides, back to the rolling channel, of the second bearing seats are movably connected with the rack through rotating assemblies. The pole piece rolling device has the technical effects that the size of a roll gap in the rolling process can be kept unchanged, so that the thicknesses of pole pieces are consistent, and the quality of the pole pieces is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery production, and particularly relates to a pole piece rolling device. Background Art

[0002] At present, as a new energy source, lithium batteries have become the main power source of new energy vehicles. Their performance directly determines key indicators such as the driving range, service life, safety, and cost of the vehicle. The thickness consistency of pole piece rolling forming is one of the important indicators to measure the performance of lithium batteries. If the thickness consistency of the pole piece is not well controlled, it will lead to inconsistent cell performance, directly affecting the performance and cycle life of the battery pack, and even causing safety accidents such as fire and explosion. However, during the rolling process, the pole piece is thick in the middle and thin at the edges in the thickness direction, seriously affecting the quality of the pole piece, resulting in defective products and a large amount of waste of raw materials.

[0003] At present, there are two commonly used methods for correcting the non-uniformity of the transverse thickness of the pole piece: the hydraulic bending roll correction method and the arc roll convexity correction method.

[0004] Hydraulic bending roll correction method: Apply a bending roll force in the opposite direction of the roll pressure on the bending roll seat at the outer end of the roll bearing seat to resist the flexural deformation of the roll. This method makes the roll longer, and components such as a bending roll seat, a hydraulic cylinder, and a fixed seat need to be designed. The hydraulic bending roll design circuit is relatively complex, making the floor space of the rolling machine equipment too large, and the design cost and maintenance cost are high.

[0005] Arc roll convexity correction method: Design the roll surface section of the roll from a cylindrical section to a waist drum shape with a certain convexity, which can correct the non-uniformity of the pole piece during rolling. This method has a high processing cost for the arc roll, and there is wear during the rolling process, resulting in high later maintenance costs. An arc roll with a specific convexity can only roll and correct a specific type of pole piece, and its applicability is low. Content of the Utility Model

[0006] In order to solve the deficiencies of the above-mentioned prior art, the utility model provides a pole piece rolling device.

[0007] The technical effects to be achieved by the utility model are realized through the following technical aspects:

[0008] A pole piece rolling device comprises a frame, a first rolling roller, a second rolling roller and a rotating assembly; the first rolling roller and the second rolling roller are arranged opposite to each other, and there is a gap between the first rolling roller and the second rolling roller to form a rolling channel; first bearing seats are arranged at both ends of the first rolling roller, and the side of the first bearing seat facing away from the rolling channel is rotatably connected to the frame through the rotating assembly, so that the side of the first bearing seat close to the rolling channel can rotate toward the rolling channel; second bearing seats are arranged at both ends of the second rolling roller, and the side of the second bearing seat facing away from the rolling channel is rotatably connected to the frame through the rotating assembly, so that the side of the second bearing seat close to the rolling channel can rotate toward the rolling channel.

[0009] In some embodiments of the present application, an adjustment assembly is further included, wherein the adjustment assembly includes a first support member, and the first support member is disposed between the first bearing seat and the second bearing seat to adjust the height of the rolling channel;

[0010] The first bearing seat is provided with a first driving assembly to drive the first roller to approach or move away from the second roller.

[0011] In some embodiments of the present application, a second driving assembly is transmission-connected to the first supporting member, and the second driving assembly drives the first supporting member to move so as to adjust the height of the rolling channel.

[0012] In some embodiments of the present application, the adjustment assembly also includes a second support member cooperating with the first support member, moving the first support member to drive the second support member to move and thereby change the height of the rolling channel; or moving the second support member to drive the first support member to move and thereby change the height of the rolling channel.

[0013] In some embodiments of the present application, the adjustment assembly further includes a third drive assembly, and the third drive assembly is transmission-connected to the first support member or the second support member.

[0014] In some embodiments of the present application, the first support member is a first inclined block, the second support member is a second inclined block, and the inclined surface of the first inclined block matches the inclined surface of the second inclined block.

[0015] In some embodiments of the present application, the surface of the first inclined block in contact with the first bearing seat includes a first contact portion and a second contact portion, the first contact portion is a plane, and the second contact portion is an inclined surface.

[0016] In some embodiments of the present application, the surface of the second inclined block in contact with the second bearing block includes a third contact portion and a fourth contact portion. The third contact portion is a flat surface, and the fourth contact portion is an inclined surface.

[0017] In some embodiments of the present application, the rotating assembly includes a first spherical pad and a second spherical pad.

[0018] In some embodiments of the present application, the first support member is made of S45C or 40Cr or 9Cr3Mo material.

[0019] In summary, the present utility model has the following beneficial effects:

[0020] The pole piece rolling device of the present utility model is provided with a rotating assembly. The rotating assembly can movably connect the bearing block and the frame. When the bearing block is subjected to an external force, it can rotate towards the rolling channel direction, causing the first rolling roll and the second rolling roll to perform bending rolls, keeping the roll gap size unchanged during the rolling process, making the pole piece thickness uniform, and improving the pole piece quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the pole piece rolling device in an embodiment of the present application.

[0022] Figure 2 is a side view of the pole piece rolling device in an embodiment of the present application.

[0023] Figure 3 is a schematic structural diagram of the adjusting assembly in an embodiment of the present application.

[0024] Figure 4 is a front view of the adjusting assembly in an embodiment of the present application.

[0025] Figure 5 is a side view of the adjusting assembly in an embodiment of the present application.

[0026] Figure 6 is a schematic structural diagram of the rotating assembly in an embodiment of the present application.

[0027] Reference numerals in the drawings:

[0028] 1, frame; 2, first rolling roll; 3, second rolling roll; 4, adjusting assembly; 401, first support member; 401a, first contact portion; 401b, second contact portion; 402, second support member; 402a, third contact portion; 402b, fourth contact portion; 403, third driving assembly;

[0029] 5, rotating assembly; 501, first spherical pad; 502, second spherical pad;

[0030] 6. First bearing housing; 7. Second bearing housing; 8. First drive assembly. Detailed implementation manners

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. The described embodiments are some, but not all, of the embodiments of the present utility model.

[0032] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0033] Embodiment 1

[0034] Please refer to the attached Figure 1 , 2 , the pole piece rolling device of the present utility model includes a frame 1, a first rolling roll 2, a second rolling roll 3, and a rotating assembly 5; the first rolling roll 2 and the second rolling roll 3 are arranged oppositely, and there is a gap between the first rolling roll 2 and the second rolling roll 3 to form a rolling channel; both ends of the first rolling roll 2 are provided with first bearing housings 6, and one side of the first bearing housing 6 facing away from the rolling channel is rotationally connected to the frame 1 through the rotating assembly 5, so that one side of the first bearing housing 6 close to the rolling channel can rotate towards the rolling channel direction; both ends of the second rolling roll 3 are provided with second bearing housings 7, and one side of the second bearing housing 7 facing away from the rolling channel is rotationally connected to the frame 1 through the rotating assembly 5, so that one side of the second bearing housing 7 close to the rolling channel can rotate towards the rolling channel direction.

[0035] Specifically, the frame 1 is composed of two erected frame plates 1. Installation windows are processed inside the frame plates 1, and the bottom and top of the two frame plates 1 are composed of two support rods; both ends of the first rolling roll 2 are provided with first bearing housings 6 to facilitate the rotation of the first rolling roll 2, and both ends of the second rolling roll 3 are provided with second bearing housings 7 to facilitate the rotation of the second rolling roll 3. The first rolling roll 2 and the second rolling roll 3 are arranged on the frame 1 through the first bearing housings 6 and the second bearing housings 7. Among them, a gap (rolling gap) is left between the first rolling roll 2 and the second rolling roll 3 to form a rolling channel for rolling the pole piece. The first bearing housing 6 and the second bearing housing 7 are connected to the frame 1 through the rotating assembly 5. When the first bearing housing 6 or the second bearing housing 7 is subjected to an external force, it can rotate towards the rolling channel direction, thereby driving the first rolling roll 2 or the second rolling roll 3 to bend and better roll the pole piece.

[0036] In some embodiments, it further includes an adjusting assembly 4. The adjusting assembly 4 includes a first support member 401 which is arranged between the first bearing block 6 and the second bearing block 7 to adjust the height of the rolling channel; a first driving assembly 8 is arranged on the first bearing block 6 to drive the first rolling roll 2 to approach or move away from the second rolling roll 3.

[0037] A first support member 401 is arranged between the first bearing block 6 and the second bearing block 7, which is used to adjust the distance between the first bearing block 6 and the second bearing block 7. Exemplarily, the first support member 401 can be an oil cylinder, a jack, a support block, etc.; a first driving assembly 8 is arranged on the side of the first bearing block 6 facing away from the rolling channel, and the first driving assembly 8 is used to drive the first bearing block 6 to reciprocate in the direction of the second rolling roll 3, and then drive the first rolling roll 2 to reciprocate in the direction of the second rolling roll 3 to change the size of the roll gap. Exemplarily, the first moving assembly is an oil cylinder, and the first bearing block 6 is driven to move by the oil cylinder; it can be understood that the first bearing block 6 described in this embodiment is the bearing block arranged at both ends of the first rolling roll 2, that is to say, oil cylinders are driven-connected to both ends of the first rolling roll 2 to drive the two ends of the first rolling roll 2 to move synchronously.

[0038] During use, first drive the first rolling roll 2 to move through the oil cylinder, adjust the rolling channel between the first rolling roll 2 and the second rolling roll 3 to a suitable position, and then perform rolling. When the pole piece is rolled and shows thick in the middle and thin at the edges, and the difference (difference = the maximum thickness of the pole piece after rolling - the minimum thickness of the pole piece after rolling) is large, it is corrected through the following steps: the first support member 401 makes the gap between the first bearing block 6 and the second bearing block 7 larger. At this time, the bending roll force between the bearing block and the first support member 401 becomes larger, and the first bearing block 6 and the second bearing block 7 rotate, so that the first rolling roll 2 and the second rolling roll 3 are slightly bent. At the same time, because the bending roll force absorbs the force of the oil cylinder, in order to ensure that the extrusion force of the rolling roll on the pole piece remains unchanged and the average thickness of the pole piece after rolling remains unchanged, increase the pressure of the oil cylinder to ensure the consistency of the pole piece thickness.

[0039] When the pole piece is rolled and shows thin in the middle and thick at the edges, and the difference is large, it means that the correction of the non-uniformity of the pole piece thickness is excessive. At this time, the first support member 401 makes the gap between the first bearing block 6 and the second bearing block 7 smaller, and the acting force between the first support member 401 and the first bearing block 6 and the second bearing block 7 decreases, that is, the bending roll force. The smaller the bending roll force, the weaker the correction effect of the pole piece. At the same time, in order to ensure that the rolling force acting on the pole piece remains unchanged, the pressure of the oil cylinder should be reduced.

[0040] By setting the rotating component 5 and the adjusting component 4, the rotating component 5 can movably connect the bearing seat to the frame 1. When the bearing seat is subjected to an external force, it can rotate towards the direction of the rolling channel, causing the first roller 2 and the second roller 3 to deflect, improving the constancy of the roll gap during the rolling process, maintaining the consistency of the pole piece thickness, and improving the quality of the pole piece; the adjusting member can adjust the gap between the bearing seats, change the magnitude of the bending roll force, and improve its adaptability. This design structure is more compact. Compared with the existing hydraulic bending roll design method, it saves the floor space of the equipment, and the operation of controlling the thickness of the pole piece is simple.

[0041] In some embodiments, a second driving component is drivingly connected to the first support member 401, and the second driving component drives the first support member 401 to move so as to adjust the height of the rolling channel. Among them, the second driving component drives the movement of the first support member 401 to adjust the gap between the first bearing seat 6 and the second bearing seat 7, improving the degree of automation of the equipment. Exemplarily, the first support member 401 can be an inclined block, and the gap between the first bearing seat 6 and the second bearing seat 7 is controlled by its inclined surface. The second driving component can be a motor screw rod, a cylinder, etc., to push the inclined block to move, thereby changing the gap between the bearing seats.

[0042] Embodiment 2

[0043] The difference between this embodiment and Embodiment 1 is that this embodiment further optimizes the pole piece rolling device of the present invention. Refer to Figures 3 and 5.

[0044] In some embodiments, the adjusting component 4 further includes a second support member 402 that cooperates with the first support member 401. Move the first support member 401 to drive the second support member 402 to move, thereby changing the height of the rolling channel; or move the second support member 402 to drive the first support member 401 to move, thereby changing the height of the rolling channel. Among them, the first support member 401 and the second support are arranged between the bearing seats. By moving the first support member 401 or the second support member 402, the gap between the bearing seats is changed. This setting saves costs and the adjustment process is stable.

[0045] Furthermore, the adjusting component 4 further includes a third driving component 403, and the third driving component 403 is drivingly connected to the first support member 401 or the second support member 402. By driving the support member to move through the third driving component 403, and then changing the size of the bearing seat, the degree of automation of the equipment can be improved. Exemplarily, the third driving component 403 can be a driving lead screw, and the driving lead screw is connected to the motor. The motor controls the movement of the driving lead screw, and then drives the first support member 401 or the second support member 402 to move.

[0046] It can be understood that the first support member 401 and the second support member 402 are arranged on the outermost sides between the bearing seats. The farther the fulcrum is from the center, the longer the force arm is, and the higher the sensitivity of correction is. That is, by adjusting the distance between the adjusting components 4, the change of the bending roll moment becomes more obvious. The farther the fulcrum is from the center, the longer the force arm is, and the more sensitive the correction is. Preferably, the first support member 401 and the second support member 402 are installed on the outermost sides to enhance the correction effect. They can also be arranged on the inner sides or in the middle regions between the bearing seats, etc. The specific installation position depends on the actual usage situation.

[0047] In some embodiments, the first support member 401 is a first inclined block, and the second support member 402 is a second inclined block. The inclined surface of the first inclined block cooperates with the inclined surface of the second inclined block. The inclined surfaces of the first inclined block and the second inclined block face each other. By moving the first inclined block to slide on the inclined surface of the second inclined block, the gap between the bearing seats can be changed.

[0048] In some embodiments, the surface of the first inclined block in contact with the first bearing seat 6 includes a first contact portion 401a and a second contact portion 401b. The first contact portion 401a is a plane, and the second contact portion 401b is an inclined surface. The plane of the first contact portion 401a can reduce the stress concentration at the contact position and also prevent the inclined block from sliding outwards. The inclined surface of the second contact portion 401b is beneficial for the rolling mill roll to extrude the inclined surface downwards, and the bearing seat can also contact the inclined surface during bending.

[0049] In some embodiments, the surface of the second inclined block in contact with the second bearing seat 7 includes a third contact portion 402a and a fourth contact portion 402b. The third contact portion 402a is a plane, and the fourth contact portion 402b is an inclined surface. The surfaces of the first inclined surface and the second inclined surface in contact with the bearing seat are both provided with a first contact portion 401a and a second contact portion 401b. During the bending roll process, it can prevent the inclined block from sliding outwards. At the same time, both bearing seats on both sides can be attached to the inclined surface contact portion, which is beneficial for achieving the bending roll effect. Exemplarily, the first contact portion 401a is a plane with a length of 10 or 50 mm, and the second contact portion 401b is an inclined surface with a height of 0.5 or 3 mm, which is beneficial for the rolling mill roll to extrude the sheet.

[0050] In some embodiments of the present application, the first support member 401 is made of S45C or 40Cr or 9Cr3Mo material. The above materials have relatively high strength. Preferably, quenched and tempered S45C or 40Cr or 9Cr3Mo can be used to enable the first support member 401 to meet the strength requirements.

[0051] Embodiment 3

[0052] The difference between this embodiment and Embodiment 1 is that this embodiment further optimizes the pole piece rolling device of the present utility model. Refer to Figure 6 .

[0053] Further, the rotating assembly 5 includes a first spherical pad 501 and a second spherical pad 502. The first spherical pad 501 is disposed on the frame 1, and the second spherical pad 502 is disposed on the first bearing block 6 and the second bearing block 7. The first spherical pad 501 and the second spherical pad 502 are mutually matched through a spherical pair and have a rotational freedom degree of the spherical pair, which is beneficial to better extruding the pole piece.

[0054] In some embodiments, one surface of the first spherical pad 501 is concave, and one surface of the first spherical pad 501 is convex, and the concave surface and the convex surface are matched. Exemplarily, the surface of the first spherical pad 501 facing away from the concave surface is connected to the frame 1, and the surface of the second spherical pad 502 facing away from the convex surface is connected to the bearing block. It can be understood that the connection manner can also be that the surface of the first spherical pad 501 facing away from the concave surface is connected to the bearing block, and the surface of the second spherical pad 502 facing away from the convex surface is connected to the frame 1.

[0055] In the present utility model, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0056] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model 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 utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0057] In addition, the terms "horizontal", "vertical", "hanging" and other terms do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0058] In the present utility model, unless otherwise clearly stipulated and defined, the first feature being above or below the second feature may include direct contact between the first and second features, or may include contact between the first and second features through additional features therebetween rather than direct contact. Moreover, the first feature being above, over, and on top of the second feature includes the first feature being directly above and diagonally above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being below, under, and beneath the second feature includes the first feature being directly below and diagonally below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0059] Although the description of the present utility model is made in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications, and variations based on the above content. Therefore, all such substitutions, improvements, and variations are included within the spirit and scope of the appended claims.

Claims

1. A pole piece rolling device, characterized in that: It includes a frame, a first roller, a second roller and a rotating assembly; The first roller and the second roller are arranged opposite to each other, and there is a gap between the first roller and the second roller to form a rolling channel; Both ends of the first roller are provided with first bearing seats, and the side of the first bearing seat facing away from the rolling channel is rotatably connected to the frame through the rotating assembly, so that the side of the first bearing seat close to the rolling channel can rotate toward the rolling channel; Second bearing seats are provided at both ends of the second rolling roller. The side of the second bearing seat facing away from the rolling channel is rotatably connected to the frame through the rotating assembly, so that the side of the second bearing seat close to the rolling channel can rotate toward the rolling channel.

2. The pole piece rolling device according to claim 1, characterized in that: The invention also includes an adjustment component, wherein the adjustment component includes a first support member, and the first support member is arranged between the first bearing seat and the second bearing seat to adjust the height of the rolling channel; The first bearing seat is provided with a first driving assembly to drive the first roller to approach or move away from the second roller.

3. The pole piece rolling device according to claim 2, characterized in that: The first support member is transmission-connected with a second driving assembly, and the second driving assembly drives the first support member to move so as to adjust the height of the rolling channel.

4. The pole piece rolling device according to claim 2, characterized in that: The adjusting assembly further comprises a second supporting member matched with the first supporting member, and the first supporting member is moved to drive the second supporting member to move so as to change the height of the rolling channel; or The second supporting member is moved to drive the first supporting member to move, thereby changing the height of the rolling channel.

5. The pole piece rolling device according to claim 4, characterized in that: The adjustment assembly further includes a third drive assembly, and the third drive assembly is drivingly connected to the first support member or the second support member.

6. The pole piece rolling device according to claim 4, characterized in that: The first supporting member is a first inclined block, the second supporting member is a second inclined block, and the inclined surface of the first inclined block matches the inclined surface of the second inclined block.

7. The pole piece rolling device according to claim 6, characterized in that: The surface of the first inclined block in contact with the first bearing seat includes a first contact portion and a second contact portion, the first contact portion is a plane, and the second contact portion is an inclined surface.

8. The pole piece rolling device according to claim 7, characterized in that: The surface of the second inclined block in contact with the second bearing seat includes a third contact portion and a fourth contact portion, the third contact portion is a plane, and the fourth contact portion is an inclined surface.

9. The pole piece rolling device according to claim 1, characterized in that: The rotating assembly includes a first spherical pad and a second spherical pad.

10. The pole piece rolling device according to claim 2, characterized in that: The first support member is made of S45C or 40Cr or 9Cr3Mo material.

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