Lithium battery pole piece slitting ceramic compression roller device

Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a lithium battery pole piece slitting ceramic compression roller device. A winding shaft and a supporting shaft are arranged between the equipment large plates, a plurality of compression roller devices are arranged on the supporting shaft, a charging barrel used for winding battery pole pieces is arranged on the winding shaft, and each compression roller device is structurally characterized in that a linear guide rail and a sliding block are mounted on the supporting shaft, a fixed base is mounted on the sliding block, the fixed base is connected with one end of a compression roller arm through a limiting pin shaft, and the other end of the compression roller arm is connected with the supporting shaft. The other end of the compression roller arm is connected with a support through a connecting shaft, and a ceramic compression roller is arranged on the support. The angle of the pressing roller arm is adjusted in real time by detecting the winding diameter, it is guaranteed that the pressure acting on the battery pole piece is stable, in addition, the set air cylinder pressure acts on the wound pole piece through the ceramic pressing roller with the mirror surface level surface roughness for flattening, the undesirable phenomena of material falling and edge warping of the end face of the pole piece after slitting are avoided, and the product quality is improved. And meanwhile, the generation of metal foreign matters is avoided, so that the production safety of the battery pole piece is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of lithium ion batteries, and in particular to a lithium battery pole piece cutting ceramic roller device. Background Art

[0002] Lithium-ion battery pole piece slitting is an essential process in the preparation of lithium-ion batteries. The quality of the rolled pole piece after slitting is a key factor in determining product yield and battery performance. However, current technology has also provided solutions to the problem of curling of battery pole pieces, but it cannot effectively eliminate the curling abnormality during the winding process.

[0003] After slitting, the battery pole pieces are wound up on the barrel in circles to form pole piece rolls of a specified diameter. The surface roughness of the winding roller will cause the pole piece edges to fall off, which not only pollutes the process environment, but more importantly, the falling powder will reduce the battery capacity and seriously endanger the safety performance of the battery. There is currently no technical solution to this problem.

[0004] Therefore, it is necessary to provide more effective and reliable technical solutions. Summary of the invention

[0005] The present invention provides a lithium battery pole piece slitting ceramic roller device, which can eliminate the edge warping problem generated during the battery winding process, and solve the problem of battery pole piece edge falling off during the contact between the winding roller and the battery pole piece.

[0006] In order to solve the technical problems existing in the background technology, the present invention provides a ceramic pressing roller device for slitting lithium battery pole sheets. A winding shaft and a support shaft are provided between the large plates of the equipment. A plurality of pressing roller devices are provided on the support shaft. The winding shaft is provided with a barrel for winding up the battery pole sheets. The structure of the pressing roller device is as follows: a linear guide rail and a slider are installed on the support shaft, a fixed base is installed on the slider, the fixed base is connected to one end of the pressing roller arm through a limit pin shaft, the other end of the pressing roller arm is connected to the bracket through a connecting shaft, and a ceramic pressing roller is provided on the bracket.

[0007] The above-mentioned lithium battery pole piece cutting ceramic roller device has a cylinder fixing seat and a linear cylinder arranged in sequence above the fixed base, a floating joint is arranged at the front end of the linear cylinder, and the floating joint is fixed to the roller arm connecting block on the roller arm.

[0008] Linear cylinder pressure can be set by inputting pressure on the touch screen according to production process requirements.

[0009] The above-mentioned lithium battery pole piece slitting ceramic roller device is also provided with a servo motor for controlling the linear cylinder. The servo motor drives the support shaft to adjust the angle of the roller arm according to the real-time change of the winding diameter of the battery pole piece after the equipment is started through the electrical system to ensure the constant pressure of the winding roller during the winding of the battery pole piece. The servo motor can be a stepper motor or a speed regulating motor.

[0010] In the above-mentioned lithium battery pole piece slitting ceramic roller device, a positioning optical axis is arranged parallel to the support shaft, and the positioning optical axis passes through the fixed base and is fixed by bolts.

[0011] The above-mentioned lithium battery pole piece slitting ceramic pressure roller device has a rotating seat arranged below the bracket, and the connecting shaft is connected to the rotating seat through a bearing. In the vertical direction, the limit screw passes through the bracket, and the bottom surface contacts the upper surface of the rotating seat. In the horizontal direction, the bracket and the rotating seat are fixed by a knurled nut, and side plates are provided on both sides of the rotating seat. The rotating seat and the side plates are fixed by positioning pins, and a ceramic pressure roller is provided between the side plates.

[0012] The limit screw is a non-metallic screw to prevent metal chips from being generated during the adjustment process and endangering the safety of the battery electrode product.

[0013] In the above-mentioned lithium battery pole piece slitting ceramic roller device, both ends of the limit pin are connected to the fixed base using precision needle bearings.

[0014] In the above-mentioned lithium battery pole piece slitting ceramic roller device, a linear guide rail mounting groove is provided on the support shaft, and the support shaft and the linear guide rail are positioned by pins.

[0015] The above-mentioned ceramic pressure roller device for slitting lithium battery pole pieces has a surface roughness of mirror grade or higher and a hardness greater than HRC90. The ceramic pressure roller that meets the above technical requirements greatly reduces the friction coefficient between the pressure roller and the battery pole piece. The friction force between the ceramic pressure roller and the battery pole piece is less than the adhesion force of the material, thereby preventing the edge of the battery pole piece from falling off during the winding process.

[0016] Ceramic rollers are non-metallic materials with high hardness, high surface finish, and good wear resistance, which can perfectly avoid the generation of metal foreign matter due to wear and tear, which affects the safety performance of battery electrodes. Ceramic roller materials include materials with greater hardness and higher surface finish.

[0017] The pressing roller device can be quickly disassembled, and the mold can be quickly changed according to the number of electrode strips to be cut.

[0018] Compatible with cutting battery pole pieces of different widths, at this time, loosen the fixing screws of the fixed base and the positioning optical axis, move the guide slider to align the ceramic pressure roller with the battery pole piece to be cut, and then tighten the fixing screws.

[0019] The two ends of the limit pin shaft are installed with a fixed base using precision needle bearings, which improves the stability of the connection between the two and further ensures the flattening effect.

[0020] Before the electrode sheets are cut and rolled, adjust the angle of the roller arm to make the surface of the ceramic roller fit with the surface of the barrel. Visually check whether there is a gap. If there is a gap, adjust the limit screw to make the surface of the ceramic roller fit the surface of the barrel completely. The purpose is to ensure that the pressure applied by the winding roller on the winding electrode sheet is evenly distributed. Its function is to make up for the problem of non-parallel axes between the ceramic roller and the battery electrode sheet roll. Confirmation is sufficient before each production, and no repeated operation is required during the process.

[0021] 1. Before each production, the present invention can confirm and adjust the state of the ceramic roller surface and the barrel surface by adjusting the limit screw. The purpose is to ensure that the pressure applied by the winding roller on the winding pole piece is evenly distributed.

[0022] 2. The ceramic roller assembly of the present invention can be quickly disassembled, and rapid mold change can be achieved according to the number of electrode strips to be cut.

[0023] 3. The ceramic roller is made of non-metallic material with high hardness, high surface finish and good wear resistance, which can perfectly avoid the generation of metal foreign matter due to wear and tear, affecting the safety performance of the battery electrode.

[0024] 4. The surface roughness of the ceramic roller is mirror grade or higher, and the hardness is greater than HRC90. The ceramic roller that meets the above technical requirements greatly reduces the friction coefficient between the roller and the battery pole piece. The friction between the ceramic roller and the battery pole piece is less than the adhesion of the material, thereby preventing the edge of the battery pole piece from falling off during the winding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the ceramic roller device for cutting lithium battery pole pieces.

[0026] Figure 2 This is a partial structural schematic diagram of the ceramic roller device for cutting lithium battery pole pieces.

[0027] Figure 3 This is a schematic diagram of the structure of the ceramic roller assembly of the ceramic roller device for cutting lithium battery pole pieces.

[0028] Figure 4 This is a cross-sectional view of the limit pin of the ceramic roller device for cutting lithium battery pole pieces.

[0029] Figure 5 A cross-sectional view of a ceramic pressing roller of a ceramic pressing roller device for cutting lithium battery pole pieces.

[0030] Figure 6 This is a front view of the rotating seat of the ceramic pressing roller device for cutting lithium battery pole pieces.

[0031] Figure 7 This is the left view of the rotating seat of the ceramic pressing roller device for cutting lithium battery pole pieces.

[0032] Explanation of the reference numerals: 1-equipment plate, 2-support shaft, 3-winding shaft, 4-barrel, 5-battery pole piece, 6-servo motor, 7-linear guide, 8-slider, 9-fixed base, 10-pressure roller arm, 12-ceramic pressure roller, 13-positioning optical axis, 14-cylinder fixing seat, 15-linear cylinder, 16-pressure roller arm connecting block, 17-floating joint, 18-limiting pin, 19-needle bearing, 31-connecting shaft, 32-bracket, 33-limiting screw, 34-locking nut, 35-rotating seat, 36-knurled nut, 37-locating pin, 38-side plate. DETAILED DESCRIPTION

[0033] If certain words are used in the specification and claims to refer to specific components, it should be understood by those skilled in the art that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not distinguish between different terms.

[0034] The difference in function is used as the criterion for distinguishing components. As mentioned in the entire specification and claims, "including" is an open term and should be interpreted as "including but not limited to". "Substantially" means that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0035] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "horizontal", "vertical", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection 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.

[0037] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described in detail below with reference to the accompanying drawings, but this does not limit the present invention.

[0038] Figure 1 The overall structure of some embodiments of the present application is shown in FIG. Figure 1 , Figure 2 This is a schematic diagram of a single-station assembly for controlling winding pressure as described in some embodiments of the present application.

[0039] refer to Figure 1 and Figure 2 The lithium battery pole piece slitting ceramic roller device comprises: a winding shaft 3 and a support shaft 2 are arranged between the equipment large plate 1, four roller devices are arranged on the support shaft 2, a servo motor 6 is fixed to the outside of the equipment large plate 1, one end of the support shaft 2 is fixed to the inside of the equipment large plate 1, and the servo motor 6 shaft is connected to the other end of the support shaft 2. It should be noted that the fixing method of the support shaft 2, the winding shaft 3, the servo motor 6 and the equipment large plate 1 is not the focus of the present invention, and all the related drawings are only schematic diagrams for the above-mentioned fixing method, and therefore cannot be understood as a limitation of the present invention.

[0040] The structure of the pressure roller device is as follows: refer to Figure 1 and Figure 2 The support shaft 2 is provided with a guide groove to fix the linear guide rail 7, so that the axis of the linear guide rail 7 is parallel to the axis of the support shaft 2. The lower part of the fixed base 9 and the upper part of the slider 8 are fixed with hexagon socket bolts, and one end of the fixed base 9 of the four roller devices is fixed in series through the positioning optical axis 13. The above fixing method ensures the consistency of the position accuracy of the fixed base 9 of the four roller devices.

[0041] refer to Figure 2 and reference Figure 4 The fixed base 9 has a bearing mounting hole at one end, and the roller arm 10 has a bearing mounting hole at one end. The limit pin 18 has an interference fit with the bearing holes of the two. The two ends of the limit pin 18 are connected to the fixed base 9 using precision needle bearings 19. The needle bearings 19 are used to ensure radial and axial accuracy. The fixed base 9 and the roller arm 10 are rotatably connected. The above assembly accuracy requirements are to ensure that the axis of the winding shaft 3 is parallel to the axis of the ceramic roller 12.

[0042] refer to Figure 2 and reference Figure 4, a cylinder fixing seat 14 is installed on the upper part of the fixed base 9, and the two are fixed with hexagon socket bolts. The cylinder fixing seat 14 and the linear cylinder 15 are fixed by the bottom through pin. The roller arm connecting block 16 and the roller arm 10 are fixed by the threaded bolts in the middle. The piston rod of the linear cylinder 15 is connected to one end of the floating joint 17 by threads, and the other end of the floating joint 17 is connected to the roller arm connecting block 16 by threads. It can be realized that the bottom of the linear cylinder 15 drives the roller arm 10 to rotate within a certain angle around the limit pin 18 based on the fixed base 9.

[0043] refer to Figure 1 and reference Figure 3 The pressure roller arm 10 is connected to the connecting shaft 31 through two threaded holes and two pins. The fixed end of the connecting shaft 31 is correspondingly provided with two hexagonal through holes and two pin holes. This design can realize the quick installation of the pressure roller arm 10 and the fixed end of the connecting shaft 31 without position adjustment, which is convenient and quick.

[0044] refer to Figure 3 The roller device includes: a connecting shaft 31, a bracket 32, a non-metallic limit screw 33, a locking nut 34, a rotating seat 35, a knurled nut 36, a positioning pin 37, a side plate 38, and a ceramic roller 12. A rotating seat 35 is arranged below the bracket 32, and the connecting shaft 31 is connected to the rotating seat 35 through a bearing. In the vertical direction, the limit screw 33 passes through the bracket 32, and the bottom surface contacts the upper surface of the rotating seat 35. In the horizontal direction, the bracket 32 ​​and the rotating seat 35 are fixed by the knurled nut 36. Side plates 38 are arranged on both sides of the rotating seat 35. The rotating seat 35 and the side plates 38 are fixed by positioning pins 37, and a ceramic roller 12 is arranged between the side plates 38. In actual production, the roller device can be quickly disassembled by removing the two screws fixed between the connecting shaft 31 and the roller arm 10, and a quick mold change can be achieved according to the number of electrode strips to be cut.

[0045] refer to Figure 1 and reference Figure 3 Before the electrode sheets are cut and rolled, adjust the angle of the roller arm 10 so that the surface of the ceramic roller 12 fits with the surface of the barrel 4. Visually check whether there is a gap. If there is a gap, adjust the limit screw 33 to make the surface of the ceramic roller fit completely with the surface of the barrel 4. This ensures that the pressure applied by the ceramic roller 12 on the rolled electrode sheet is evenly distributed. Its function is to make up for the problem that the axes of the ceramic roller and the battery electrode sheet roll are not parallel. It only needs to be confirmed before each production, and there is no need to repeat the operation during the process.

[0046] refer to Figure 3 and reference Figure 6 , one threaded hole and two pin holes are provided on each side of the rotating seat 35, two pin holes are provided on the side plate 38 corresponding to the pin hole position of the rotating seat 35, and a through hole is provided at the corresponding threaded hole position. Through the installation method of the two pin holes and threaded holes, the installation accuracy of the ceramic pressure roller can be guaranteed, and the stability of the structure can be further guaranteed.

[0047] refer to Figure 1 The axes of the support shaft 2, the winding shaft 3 and the ceramic pressure roller are parallel.

[0048] refer to Figure 1 and Figure 2 and Figure 5 When starting to cut the battery pole piece, the staff opens the linear cylinder 15 above the roller arm 10, and moves the touch screen to drive the servo motor 6 to rotate the support shaft 2, the fixed base 9, the roller arm 10, and the roller device, so that the surface of the ceramic roller 12 contacts the surface of the winding barrel 4. During automatic production, the sensor detects the change in the winding diameter of the battery pole piece 5 in real time, and controls the servo motor 6 through the electrical system to drive the support shaft 2 to adjust the angle of the roller arm 10 to ensure constant pressure of the winding roller during the winding of the battery pole piece 5.

[0049] refer to Figure 3 and Figure 5 The ceramic pressure roller is made through pressing and sintering processes, and then is cylindrically ground and polished. The surface roughness level is mirror grade or higher, and the hardness is greater than HRC90. The ceramic pressure roller that meets the above technical requirements greatly reduces the friction coefficient between the pressure roller and the battery pole piece. The friction between the ceramic pressure roller and the battery pole piece is less than the adhesion of the material, thereby preventing the edge of the battery pole piece from falling off during the winding process.

[0050] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs can also change and modify the above embodiment. Therefore, the present invention is not limited to the above specific embodiment, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the present invention belongs to the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A ceramic roller device for slitting lithium battery pole pieces, wherein a winding shaft (3) and a support shaft (2) are arranged between large plates (1) of the device, a plurality of roller devices are arranged on the support shaft (2), and a barrel (4) for winding up the battery pole piece (5) is arranged on the winding shaft (3), characterized in that: The structure of the pressure roller device is as follows: a linear guide rail (7) and a slider (8) are installed on the support shaft (2); a fixed base (9) is installed on the slider (8); the fixed base (9) is connected to one end of the pressure roller arm (10) through a limit pin (18); the other end of the pressure roller arm (10) is connected to a bracket (32) through a connecting shaft (31); and a ceramic pressure roller (12) is provided on the bracket (32).

2. A lithium battery pole piece cutting ceramic roller device according to claim 1, characterized in that: A cylinder fixing seat (14) and a linear cylinder (15) are arranged in sequence above the fixed base (9); a floating joint (17) is arranged at the front end of the linear cylinder (15); and the floating joint (17) is fixed to a roller arm connecting block (16) on the roller arm (10).

3. A lithium battery pole piece slitting ceramic roller device according to claim 2, characterized in that: A servo motor (6) for controlling the linear cylinder (15) is also provided.

4. A lithium battery pole piece slitting ceramic roller device according to claim 1, characterized in that: A positioning optical axis (13) is arranged parallel to the support shaft (2), and the positioning optical axis (13) passes through the fixed base (9) and is fixed by bolts.

5. A lithium battery pole piece slitting ceramic roller device according to claim 1, characterized in that: A rotating seat (35) is arranged below the bracket (32), the connecting shaft (31) and the rotating seat (35) are connected via a bearing, in the vertical direction, a limit screw (33) passes through the bracket (32), and the bottom surface contacts the upper surface of the rotating seat (35), in the horizontal direction, the bracket (32) and the rotating seat (35) are fixed via a knurled nut (36), side plates (38) are arranged on both sides of the rotating seat (35), the rotating seat (35) and the side plates (38) are fixed via positioning pins (37), and a ceramic pressure roller (12) is arranged between the side plates (38).

6. A lithium battery pole piece cutting ceramic roller device according to claim 1, characterized in that: Both ends of the limit pin shaft (18) are connected to the fixed base (9) using precision needle bearings (19).

7. A lithium battery pole piece slitting ceramic roller device according to claim 1, characterized in that: A linear guide rail installation groove is provided on the support shaft (2), and the support shaft (2) and the linear guide rail (7) are positioned by pins.

8. The lithium battery pole piece slitting ceramic roller device according to claim 1, characterized in that: The surface roughness of the ceramic pressing roller (12) is mirror grade.

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