Lithium battery pole piece trimming device

Abstract

The utility model discloses an edge cutting device for a lithium battery pole piece. The edge cutting device comprises a first driving roller, a protective cover and a second driving roller, a pole piece needing to be subjected to edge cutting operation bypasses the first transmission roller and the second transmission roller in sequence, and the part, located between the first transmission roller and the second transmission roller, of the pole piece penetrates through a pole piece groove formed in the right side of the hollow protective cover from back to front; the pole piece grooves are internally and externally communicated, and upper and lower groove surfaces of the pole piece grooves are opened; cutters which are longitudinally distributed are arranged in the protective cover; the cutter is used for cutting the pole piece into two parts, namely an edge-cut pole piece and an edge strip in the width direction; and the edge strip passes through the gap between the first edge strip clamping roller and the second edge strip clamping roller after winding through the second transmission roller and is in contact with the first edge strip clamping roller and the second edge strip clamping roller. The pole piece cutting device can safely and reliably cut off empty foil parts on the two sides of a pole piece coated with slurry and dried, metal scraps and slurry dust generated at the cut position are effectively prevented from being splashed to the surface of the pole piece, and the production quality and the yield of the pole piece are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a lithium battery pole piece trimming device. Background Art

[0002] Lithium-ion batteries have the advantages of high specific capacity, high rated voltage, no memory effect, low storage self-discharge rate, and long cycle charge and discharge service life. They are widely used not only in portable electronic devices (such as mobile phones, digital cameras and laptops), but also in large and medium-sized electric equipment such as electric vehicles, electric bicycles and electric tools. Therefore, the performance and safety requirements of lithium-ion batteries are getting higher and higher.

[0003] Lithium-ion battery pole pieces are the donors and carriers of electrochemically active substances and are the most important components in lithium-ion batteries. To produce pole pieces, a uniformly dispersed slurry containing active substances is applied to a metal sheet (i.e., current collector), and then dried, rolled, and cut. Since the slurry is a fluid, empty foil must be left on both sides of the current collector (i.e., both sides of the width direction of the current collector) during the coating process, otherwise the slurry will overflow onto the equipment. In the subsequent rolling process, the part of the pole piece coated with slurry stretches more than the empty foil parts on both sides, and the deformation becomes larger, which often causes problems such as cracked edges and broken belts, reducing the quality and yield of the pole piece. Therefore, when the pole piece is thicker, it is usually necessary to cut off the empty foil parts on the edge in advance before rolling.

[0004] At present, in order to cut off the empty foil parts on both sides of the pole piece coated with slurry and dried, the method adopted is: before rolling the pole piece coated with slurry and dried, a circular rotating cutter is set at the belt conveyor to cut off the empty foil parts synchronously with the transmission of the pole piece. The disadvantage of this method is that during the trimming process, the metal debris and slurry dust generated at the shearing point will splash onto the surface of the pole piece, and after the subsequent rolling process, it will remain on the surface of the pole piece, which can easily cause a short circuit in the battery, posing a great safety hazard.

[0005] In addition, since there is tension in the transmission of the pole piece, and the loose edge strips that are cut off have no tension, cracks or serrations are easily generated at the edges of the cuts, which in turn easily cause problems such as cracked edges and broken strips, reducing the quality and yield of the pole piece.

[0006] Therefore, there is an urgent need to develop a technology that can solve the above technical problems. Utility Model Content

[0007] The utility model aims to provide a lithium battery pole piece trimming device in view of the technical defects in the prior art.

[0008] To this end, the utility model provides a lithium battery pole piece trimming device, which includes a first transmission roller, a shield and a second transmission roller;

[0009] The pole piece that needs to be trimmed passes around the first transmission roller and the second transmission roller in turn, and the portion of the pole piece between the first transmission roller and the second transmission roller passes through the pole piece slot on the right side of the hollow shield from back to front;

[0010] The pole piece slot is connected inside and outside, and the upper and lower slot surfaces of the pole piece slot are also open;

[0011] Inside the shield, there are longitudinally distributed cutting knives;

[0012] The cutter is perpendicular to the horizontal plane;

[0013] The pole piece includes a paste-bearing part and a hollow foil part;

[0014] Empty foil parts are arranged longitudinally front and back on the left and right sides of the slurry-carrying part respectively;

[0015] A cutter is arranged corresponding to the left side of the slurry-carrying portion and close to the edge;

[0016] A cutter is used to cut the pole piece into two parts, a trimmed pole piece and a side strip, in the width direction;

[0017] After passing through the second transmission roller, the edge strip passes through the gap between the first edge strip clamping roller and the second edge strip clamping roller and contacts the first edge strip clamping roller and the second edge strip clamping roller;

[0018] The second edge strip clamping roller and the first edge strip clamping roller are symmetrically distributed front and back and are arranged transversely.

[0019] It can be seen from the technical solution provided by the above utility model that, compared with the prior art, the utility model provides a lithium battery pole piece trimming device, which has a scientific structural design and can safely and reliably cut off the empty foil parts (i.e., edge strips) on both sides of the pole piece that has been coated with slurry and dried, effectively avoiding metal debris and slurry dust generated at the shearing point during the trimming process from splashing onto the pole piece surface, thereby ensuring the production quality and yield of the pole piece, and thereby improving the overall safety of the battery, which has great practical significance.

[0020] For the utility model, a protective cover is provided at the shearing part, and a blowing device is provided on the protective cover, which can blow the debris and dust away from the pole piece. At the same time, a dust suction device is connected under the protective cover, which can timely extract the impurities blown out. In addition, the inclined shape of the protective cover can reduce the weakening of the dust removal suction force and avoid the formation of dead corners for impurity accumulation, and finally the utility model can prevent the metal debris and slurry dust generated at the shearing part from splashing onto the surface of the cut edge pole piece.

[0021] For the utility model, a special edge strip clamping roller is further arranged at the rear end of the shearing to provide a certain pulling force to avoid cracks or serrations at the edge of the cut due to unbalanced pulling force, thereby preventing problems such as edge cracks and broken strips, thereby improving the quality and yield of the electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of an embodiment of a pole piece before edge trimming;

[0023] Figure 2 This is a left view of a lithium battery pole piece trimming device provided by the utility model;

[0024] Figure 3 This is a partial rear view schematic diagram of a lithium battery pole piece trimming device provided by the utility model;

[0025] Figure 4 This is a right view of a lithium battery pole piece trimming device provided by the utility model;

[0026] Figure 5 This is a partial schematic diagram of a top view of a lithium battery pole piece trimming device provided by the utility model;

[0027] In the figure, 1 is the pole piece, 11 is the slurry-carrying part, 12 is the empty foil part, 13 is the trimmed pole piece, 14 is the edge strip; 2 is the first transmission roller;

[0028] 3 is a protective cover, 31 is a cutter external coupling shaft, 32 is a dust suction interface, 33 is a cutter (located inside the protective cover 3, the part that cannot be observed from the outside is indicated by a dotted line), and 34 is an air blowing interface;

[0029] 35 is a pole piece slot, 351 is an upper surface of the pole piece slot, 352 is a lower surface of the pole piece slot, and 353 is a left vertical surface of the pole piece slot;

[0030] 4 is the second transmission roller, 5 is the first edge strip clamping roller, and 6 is the second edge strip clamping roller. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In the present invention, the directions are as follows:

[0036] See also Figure 2 , Figure 4 As shown, the direction of movement (tape walking) along the pole piece is forward, and the reverse direction is backward.

[0037] The second transmission roller 4 is above the first edge strip clamping roller 5, and vice versa, the first edge strip clamping roller 5 is below the second transmission roller 4. This up and down is also the vertical height direction of the device relative to the ground when it is installed.

[0038] See also Figure 3 As shown, the cutter external coupling shaft 31 is on the left relative to the air blowing interface 34 (ie, the cutter external coupling shaft 31 and the air blowing interface 34 are distributed left and right), and the left and right direction is defined as the width direction.

[0039] See also Figures 1 to 5 The utility model provides a lithium battery pole piece trimming device, comprising: a first transmission roller 2, a shield 3 and a second transmission roller 4;

[0040] The pole piece 1 that needs to be trimmed (i.e., the edge strips on both sides of the pole piece are cut off, the edge strips are the empty foil with a certain width of the coating slurry, the width of the slurry is, for example, 1 mm), passes around the first transmission roller 2 and the second transmission roller 4 in turn, and the portion of the pole piece 1 between the first transmission roller 2 and the second transmission roller 4 passes through the pole piece slot 35 provided on one side (such as the right side) of the hollow shield 3 from back to front;

[0041] The inside and outside of the pole piece slot 35 are connected, and the upper and lower slot surfaces of the pole piece slot 35 are also open;

[0042] It should be noted that the pole piece slot 35 is arranged to penetrate in the front-to-back direction, and the upper and lower slot surfaces of the pole piece slot 35 are also open; that is, the pole piece slot 35 is entirely empty, and the slot surfaces in the front-to-back, upper-lower and left-to-right directions are all open.

[0043] Inside the shield 3, there are longitudinally distributed cutters 33;

[0044] The cutter 33 is perpendicular to the horizontal plane;

[0045] The pole piece 1 comprises a slurry-carrying part 11 and a hollow foil part 12;

[0046] Empty foil parts 12 are respectively arranged on the left and right sides of the slurry carrying part 11 and are longitudinally distributed front and back;

[0047] The cutter 33 is arranged corresponding to the left side of the slurry portion 11 of the pole piece 1 (i.e., the pole piece current collector after the slurry is coated and dried) near the edge (the distance between this position and the leftmost edge can be set accordingly according to the actual processing requirements, for example, when it is necessary to cut a 1 mm slurry portion and a 3 mm wide empty foil portion, the distance is 4 mm);

[0048] It should be noted that the distribution direction of the cutter 33 is parallel to the running direction of the pole piece 1 , and is also parallel to the left edge and the right edge of the pole piece 1 .

[0049] The cutter 33 is used to cut the pole piece 1 in the width direction (i.e. the horizontal left-right direction) into two parts: the trimmed pole piece 13 and the edge strip 14;

[0050] After passing through the second transmission roller 4, the edge strip 14 passes through the gap between the first edge strip clamping roller 5 and the second edge strip clamping roller 6 and contacts the first edge strip clamping roller 5 and the second edge strip clamping roller 6;

[0051] The second edge strip clamping roller 6 and the first edge strip clamping roller 5 are symmetrically distributed front to back and are arranged in the transverse direction (ie, in the left-right direction).

[0052] In the present invention, in specific implementation, the first transmission roller 2, the second transmission roller 4, the first edge strip clamping roller 5 and the second edge strip clamping roller 6 are all cylindrical in shape, have the same diameter, and have the same rotation speed (i.e., the belt conveying speed);

[0053] The first transmission roller 2, the second transmission roller 4, the first side strip clamping roller 5 and the second side strip clamping roller 6 are all arranged horizontally and parallel to each other.

[0054] In the present invention, in a specific implementation, a cylindrical cutter outer coupling shaft 31 is provided on the shield 3 in a horizontal direction (i.e., in a left-right direction);

[0055] The annular (i.e., circular) cutter 33 is sleeved on the radially outer side of the cutter outer coupling shaft 31;

[0056] The plane where the cutter 33 is located is perpendicular to the central axis of the cutter outer coupling shaft 31;

[0057] One end of the cutter outer coupling shaft 31 protrudes from the outer side wall of the shield 3 and is connected to an external driving device (such as an output shaft of a motor, connected through a coupling);

[0058] It should be noted that the cutter 33 and the cutter external coupling shaft 31 rotate synchronously and concentrically. The cutter external coupling shaft 31 is connected to an external driving device to drive the cutter 33 to rotate.

[0059] In specific implementation, the rotation linear velocity of the outermost circle of the cutter 33 is not less than the tape running velocity of the pole piece 1. If the rotation speed is too slow, the cutting effect cannot be guaranteed.

[0060] In terms of specific implementation, Figure 2 From the perspective of rotation, the cutter 33 rotates in a clockwise direction (e.g. Figure 2 This design can ensure that impurities are mainly generated under the pole piece 1, reducing the chance of contaminating the pole piece.

[0061] In specific implementation, the vertical height of the cutter outer coupling shaft 31 is higher than the vertical height of the pole piece 1;

[0062] In a specific implementation, the cutter 33 vertically penetrates through the pole piece slot 35;

[0063] In specific implementation, the vertical distance between the pole piece 1 and the lowest point of the cutter 33 thereunder is not less than one third of the radius of the cutter 33. Otherwise, the cutting effect cannot be guaranteed if the cutter is too shallow.

[0064] In specific implementation, the cutter outer coupling shaft 31 is horizontally arranged and parallel to the first transmission roller 2 .

[0065] In a specific implementation, the center points of the pole piece 1 , the first drive roller 2 , and the second drive roller 4 in the transverse direction (ie, the width direction of the pole piece, also the left-right direction) are located in the same plane, which is perpendicular to the cutter external coupling shaft 31 .

[0066] In the present utility model, in specific implementation, Figure 2 From a viewing angle, the upper portion of the shield 3 is semicircular, and its radius is greater than the radius of the cutter 33 .

[0067] In specific implementation, the lower part of the left side of the shield 3 is an isosceles trapezoid, which gradually narrows from top to bottom, and a cylindrical dust suction interface 32 is provided at the narrowest part;

[0068] The dust suction interface 32 is connected to the dust suction inlet of an external dust suction device (such as a dust collector).

[0069] In specific implementation, the entire left side surface of the shield 3 is a plane, which is perpendicular to the cutter outer coupling shaft 31 .

[0070] The lower part of the shield 3 narrows downward from the position of the lower surface 352 of the pole piece groove, and a cylindrical dust suction interface 32 is provided at the narrowest part.

[0071] In specific implementation, a portion of the cutter outer coupling shaft 31 extends out of the left side of the shield 3;

[0072] In specific implementation, a protruding air blowing interface 34 is provided on the right side of the shield 3;

[0073] The air blowing interface 34 is connected to the air outlet of an external gas compression device (such as an air compressor);

[0074] Therefore, the air flow is continuously introduced through an external air source such as an air compressor to blow away the dust and foreign matter in the protective cover 3.

[0075] In a specific implementation, the horizontal distance from the cutter 33 to the left side wall of the shield 3 is not less than 100 mm, and sufficient purge airflow departure distance is reserved to prevent the airflow carrying impurities from flowing back toward the pole piece.

[0076] In a specific implementation, the pole piece slot 35 is a horizontally arranged rectangular gap located on the right side of the shield 3 , which is connected front to back and is used for the pole piece 1 to pass through.

[0077] Furthermore, the horizontal distance between the left vertical surface 353 of the pole piece groove (the left vertical surface 353 of the pole piece groove is a vertical plane, which is only used to illustrate the horizontal distance between it and other structures, and there is no such physical structural plane, that is, it is actually the left opening of the pole piece groove 35) and the left side of the pole piece 1 is 5 to 15 mm. If the distance is too small, there is a risk of contact between the pole piece 1 and the pole piece groove 35 due to equipment vibration or pole piece shaking, thereby damaging the pole piece. If the distance is too large, the risk of impurities escaping from the protective cover 3 will increase due to the large attenuation of suction.

[0078] In terms of specific implementation, the narrowing design of the lower part of the shield 3 is conducive to the impurities being taken away by the dust suction airflow without causing dead corners for accumulation.

[0079] In terms of specific implementation, Figure 4 From the viewing angle, the right side of the shield 3 is provided with three protruding air blowing interfaces 34;

[0080] The three air blowing interfaces 34 have the same diameter and the same vertical height.

[0081] Furthermore, the lowest points of the three blowing interfaces 34 are higher than the upper surface 351 of the pole piece slot 35 in the vertical direction, and the vertical height from the upper surface 351 of the pole piece slot 35 does not exceed 5 mm to avoid attenuation of the purging effect.

[0082] Furthermore, at the front and rear positions, three air blowing interfaces 34 are respectively arranged corresponding to the front end, middle section and rear end of the cutter 33, that is, corresponding to the front, middle and rear positions of the cutter, respectively, which can more effectively prevent the pole piece from being contaminated when passing through the entire pole piece slot.

[0083] Furthermore, the tail end of the air blowing interface 34 is configured as an upward elbow to facilitate the operation of connecting or removing an external air pipe.

[0084] In specific implementation, in order to ensure that the empty foil is completely removed and the device operates stably, the edge strip 14 must have a slurry portion with a width of more than 1 mm. In other words, the edge strip is the empty foil with a portion of the slurry coated with a certain width (for example, 1 mm).

[0085] In the present invention, in a specific implementation, the center points of the edge strip 14 , the first edge strip clamping roller 5 and the second edge strip clamping roller 6 in the width direction are located in the same plane, which is perpendicular to the cutter outer coupling shaft 31 .

[0086] In a specific implementation, the vertical heights of the first edge strip clamping roller 5 and the second edge strip clamping roller 6 are the same;

[0087] The first edge strip clamping roller 5 and the second edge strip clamping roller 6 are in close contact with and clamp the edge strip 14 .

[0088] In specific implementation, the radial outer surfaces of the first side strip clamping roller 5 and the second side strip clamping roller 6 are covered with a rubber layer (specifically, a rubber layer with a certain surface roughness), that is, the surfaces of the first side strip clamping roller 5 and the second side strip clamping roller 6 are made of rubber material, which can increase the friction with the side strip 14 and prevent slipping.

[0089] In specific implementation, the first edge strip clamping roller 5 and the second edge strip clamping roller 6 are located below the second transmission roller 4, so that the transmitted edge strip 14 moves away from the trimming pole piece 13 from below to avoid contact between the two or impurities carried by the edge strip 14 falling onto the trimming pole piece 13 and causing the trimming pole piece 13 to be contaminated.

[0090] In specific implementation, the widths of the first transmission roller 2 and the second transmission roller 4 are the same, and both are greater than the width of the pole piece 1;

[0091] The widths of the first edge strip clamping roller 5 and the second edge strip clamping roller 6 are the same, and are both greater than the width of the edge strip 14 .

[0092] In the present utility model, in specific implementation, Figure 2 From the perspective of observation, the first transmission roller 2, the second transmission roller 4 and the first edge strip clamping roller 5 rotate counterclockwise (see Figure 2 as indicated by the arrow shown);

[0093] The cutter outer coupling shaft 31 and the second edge strip clamping roller 6 rotate clockwise (see Figure 2 as indicated by the arrows shown).

[0094] In specific implementation, the first transmission roller 2 is located behind the shield 3 , and the second transmission roller 4 is located in front of the shield 3 . The two have the same vertical height and jointly support and transmit the pole piece 1 to pass through the pole piece slot 35 in the shield 3 .

[0095] In specific implementation, the pole piece 1 passes horizontally through the middle position of the inner cavity of the pole piece slot 35 in the vertical direction in the longitudinal direction (i.e., the front-to-back direction), that is, the distance between the pole piece 1 and the upper surface 351 of the pole piece slot is equal to the distance between the pole piece 1 and the lower surface 352 of the pole piece slot.

[0096] In specific implementation, the height of the pole piece groove 35, that is, the distance between the upper surface 351 of the pole piece groove and the lower surface 352 of the pole piece groove is 10 to 30 mm. If the distance is too small, there is a risk of the pole piece 1 contacting the pole piece groove 35 due to equipment vibration or pole piece shaking, thereby damaging the pole piece. If the distance is too large, the risk of impurities escaping from the protective cover 3 will increase due to the large attenuation of the suction force at the pole piece groove 35.

[0097] In the present utility model, it should be noted that the first transmission roller 2, the second transmission roller 4, the first side strip clamping roller 5, the second side strip clamping roller 6, and the cutter external coupling shaft 31 are respectively linked to a driving device (for example, connected to the output shaft of the motor through a coupling), and rotate accordingly under the drive of the driving device. Of course, there are also corresponding support frames to support the various components of the entire device. The above-mentioned driving device, support frame, and vacuum cleaners, gas compressors, etc. that need to be connected externally are common structures and will not be described in detail here.

[0098] In the present invention, it should be noted that the structural design of the pole piece trimming device of the present invention is described above by taking the mechanism for cutting off the left side strip (that is, the side strip that needs to be cut off is on the left side of the pole piece, and the side strip is an empty foil with a certain width of coating slurry) as an example. The mechanism for cutting off the right side strip can be obtained by mirroring the mechanism for cutting off the left side strip, which will not be repeated here.

[0099] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A lithium battery pole piece trimming device, characterized in that: It comprises a first transmission roller (2), a protective cover (3) and a second transmission roller (4); The pole piece (1) that needs to be trimmed passes around the first transmission roller (2) and the second transmission roller (4) in sequence, and the portion of the pole piece (1) between the first transmission roller (2) and the second transmission roller (4) passes through the pole piece slot (35) on the right side of the hollow protective cover (3) from back to front; The pole piece slot (35) is connected inside and outside, and the upper and lower slot surfaces of the pole piece slot (35) are also open; A longitudinally distributed cutter (33) is arranged inside the protective cover (3); The cutter (33) is perpendicular to the horizontal plane; A pole piece (1), comprising a slurry-carrying portion (11) and a hollow foil portion (12); Empty foil parts (12) are respectively arranged on the left and right sides of the slurry carrying part (11) and are longitudinally distributed front and back; A cutter (33) is arranged corresponding to the left side of the slurry-carrying portion (11) and close to the edge thereof; A cutter (33) is used to cut the pole piece (1) into two parts, a trimmed pole piece (13) and a side strip (14), in a width direction; After passing through the second transmission roller (4), the edge strip (14) passes through the gap between the first edge strip clamping roller (5) and the second edge strip clamping roller (6) and contacts the first edge strip clamping roller (5) and the second edge strip clamping roller (6); The second edge strip clamping roller (6) and the first edge strip clamping roller (5) are symmetrically distributed front and back and are arranged transversely.

2. The lithium battery pole piece trimming device according to claim 1, characterized in that: The first transmission roller (2), the second transmission roller (4), the first edge strip clamping roller (5) and the second edge strip clamping roller (6) are all cylindrical in shape, have the same diameter and the same rotation speed; The first transmission roller (2), the second transmission roller (4), the first side strip clamping roller (5) and the second side strip clamping roller (6) are all arranged horizontally and parallel to each other.

3. The lithium battery pole piece trimming device according to claim 1, characterized in that: A cylindrical cutter outer coupling shaft (31) is disposed on the protective cover (3) and penetrates the protective cover (3) in the horizontal direction; A circular cutter (33) is sleeved on the radially outer side of the cutter outer coupling shaft (31); The plane where the cutter (33) is located is perpendicular to the central axis of the cutter outer coupling shaft (31); One end of the cutter outer coupling shaft (31) protrudes from the outer side wall of the shield (3) and is connected to an external driving device; A cylindrical dust suction interface (32) is provided at the lower part of the protective cover (3); The dust suction interface (32) is connected to the dust suction inlet of an external dust suction device.

4. The lithium battery pole piece trimming device according to claim 3, characterized in that: The rotational linear velocity of the outermost circle of the cutter (33) is not less than the tape travel velocity of the pole piece (1); The rotation direction of the cutter (33) is clockwise.

5. The lithium battery pole piece trimming device according to claim 3, characterized in that: A cutter (33) vertically penetrates through the pole piece slot (35); and / or, The vertical height of the cutter outer coupling shaft (31) is higher than the vertical height of the pole piece (1); and / or, The vertical distance between the pole piece (1) and the lowest point of the cutter (33) below it is not less than one third of the radius of the cutter (33); and / or, The cutter outer coupling shaft (31) is arranged horizontally and is parallel to the first transmission roller (2); and / or, The center points of the pole piece (1), the first transmission roller (2) and the second transmission roller (4) in the transverse direction are located in the same plane, and the plane is perpendicular to the cutter outer coupling shaft (31); and / or, The upper part of the shield (3) is semicircular, and its radius is greater than the radius of the cutter (33); and / or, The lower part of the left side of the protective cover (3) is an isosceles trapezoid, which gradually narrows from top to bottom, and a cylindrical dust suction interface (32) is provided at the narrowest part; and / or, The entire left side surface of the shield (3) is a plane, which is perpendicular to the cutter outer coupling shaft (31).

6. The lithium battery pole piece trimming device according to claim 3, characterized in that: The horizontal distance between the cutter (33) and the left side wall of the shield (3) is not less than 100 mm; and / or, The pole piece slot (35) is a horizontally arranged rectangular parallelepiped notch located on the right side of the protective cover (3); and / or, The horizontal distance between the left vertical surface (353) of the pole piece groove and the left side edge of the pole piece (1) is 5 to 15 millimeters.

7. The lithium battery pole piece trimming device according to claim 3, characterized in that: A protruding air blowing interface (34) is provided on the right side of the protective cover (3); The air blowing interface (34) is connected to the air outlet of the external air compression device.

8. The lithium battery pole piece trimming device according to claim 7, characterized in that: The right side of the protective cover (3) is provided with three protruding air blowing interfaces (34); The three air blowing interfaces (34) have the same diameter and the same vertical height.

9. The lithium battery pole piece trimming device according to claim 8, characterized in that: The lowest points of the three air blowing interfaces (34) are higher than the upper surface (351) of the pole piece slot (35) in the vertical direction, and the vertical height from the upper surface (351) of the pole piece slot (35) is no more than 5 mm; and / or, The three air blowing interfaces (34) are respectively arranged corresponding to the front end, the middle section and the rear end of the cutter (33); and / or, The tail end of the air blowing interface (34) is arranged as an upward elbow.

10. The lithium battery pole piece trimming device according to any one of claims 1 to 9, characterized in that: The center points of the edge strip (14), the first edge strip clamping roller (5) and the second edge strip clamping roller (6) in the width direction are located in the same plane, and the plane is perpendicular to the cutter outer coupling shaft (31); and / or, The vertical heights of the first edge strip clamping roller (5) and the second edge strip clamping roller (6) are the same; The first edge strip clamping roller (5) and the second edge strip clamping roller (6) are closely attached to and clamp the edge strip (14); and / or, The radial outer surfaces of the first edge strip clamping roller (5) and the second edge strip clamping roller (6) are covered with a rubber layer; and / or, The first edge strip clamping roller (5) and the second edge strip clamping roller (6) are located below the second transmission roller (4); and / or, The first transmission roller (2) and the second transmission roller (4) have the same width and are both greater than the width of the pole piece (1); The widths of the first edge strip clamping roller (5) and the second edge strip clamping roller (6) are the same and both are greater than the width of the edge strip (14); and / or, The first transmission roller (2), the second transmission roller (4) and the first edge strip clamping roller (5) rotate counterclockwise; The cutter outer coupling shaft (31) and the second edge strip clamping roller (6) rotate clockwise; and / or, The first transmission roller (2) is located behind the protective cover (3), and the second transmission roller (4) is located in front of the protective cover (3), and the vertical heights of the two are the same; The pole piece (1) vertically and horizontally penetrates through the middle position of the inner cavity of the pole piece slot (35) in the vertical direction; and / or, The height of the pole piece groove (35) is 10 to 30 mm.

Images