Slitting device and slitting method of pole piece for lithium ion battery processing

Abstract

The invention relates to the technical field of lithium ion battery pole piece processing, in particular to a slitting device of a pole piece for lithium ion battery processing and a slitting method of the slitting device. Comprising a processing table, two sets of vertical plates are arranged at one end of the processing table, an unwinding mechanism is arranged between the two sets of vertical plates, and a pole piece to be slit is wound on the unwinding mechanism; a slitting mechanism is further arranged on the machining table, and a winding assembly is further arranged on the machining table. Two groups of enclosures are symmetrically arranged on the processing table, and a first limiting roller and a second limiting roller are rotationally connected between the two groups of enclosures; a material rolling mechanism is arranged between the two sets of rolling supports. One end of the pole piece is tensioned and limited through the first limiting roller, the pole piece is slit through the slitting mechanism, and the slit pole piece is tensioned and limited through the second limiting roller and then wound on the winding mechanism to be wound.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium battery pole piece processing, and in particular relates to a pole piece slitting device and a slitting method for lithium ion battery processing. Background Art

[0002] After the lithium-ion battery pole piece is coated with slurry, dried and rolled, it forms a three-layer composite structure of current collector and two-sided coating. Then, according to the battery design structure and specifications, the pole piece needs to be cut (slit). Generally, for wound batteries, the pole piece is divided into strips according to the design width; for laminated batteries, the pole piece is cut into sheets accordingly.

[0003] After searching, in the prior art, the announcement number: CN214920951U, the announcement date: 2021-11-30, discloses a pole piece slitting machine for lithium batteries, which relates to the field of lithium battery processing technology, specifically a pole piece slitting machine for lithium batteries, including a slitting machine, the inside of the slitting machine is provided with an unwinding shaft, the top of the unwinding shaft is provided with a bidirectional lead screw, the right end of the bidirectional lead screw is fixedly connected with a servo motor, the thread on the outer surface of the bidirectional lead screw is divided into left and right sections and the spiral directions are opposite, the external thread of the bidirectional lead screw is sleeved with a push plate, the number of the push plates is two and they are symmetrically distributed on both sides of the bidirectional lead screw, and the bottom of the push plate is clamped on the outside of the unwinding shaft. The pole piece slitting machine for lithium batteries is provided with a bidirectional lead screw on the top of the unwinding shaft, and the servo motor is used to drive the bidirectional lead screw to rotate, so that the push plate rotates along the bidirectional lead screw, and the push plate is used to push the pole piece on the unwinding shaft to move, so that the pole piece is always located in the middle part of the unwinding shaft, so as to ensure the equal spacing of the pole piece.

[0004] However, the device still has the following defects: although the electrode is always located in the middle of the unwinding shaft to ensure that the electrode is cut at equal intervals, the device cannot automatically reel in the cut electrode, which can easily cause the cut electrode to scatter, requiring manual winding and collection, which is complicated to operate and requires a large amount of work. Summary of the invention

[0005] In view of the above problems, the present invention provides a slitting device and a slitting method for lithium ion battery processing pole pieces, comprising a processing table, one end of which is provided with two sets of vertical plates, a reeling mechanism is provided between the two sets of vertical plates, and the pole pieces to be slid are wound on the reeling mechanism;

[0006] The processing table is also provided with a slitting mechanism, and the processing table is also provided with a winding component;

[0007] Two groups of enclosures are symmetrically arranged on the processing table, and a first limiting roller and a second limiting roller are rotatably connected between the two groups of enclosures;

[0008] The winding assembly comprises two groups of winding brackets, and a winding mechanism is arranged between the two groups of winding brackets;

[0009] The electrode piece to be cut is wound on the unwinding mechanism, one end of the electrode piece is tensioned and limited by the first limiting roller, the electrode piece is cut by the cutting mechanism, and the cut electrode piece is tensioned and limited by the second limiting roller and then wound on the winding mechanism for winding.

[0010] Furthermore, a top plate is provided at the top of the two groups of vertical plates, and a slide groove is opened on the opposite side walls of the two groups of vertical plates. The bottom end of the top plate is fixedly connected to several groups of connecting shafts, and the bottom ends of several groups of connecting shafts are provided with arc-shaped cylinders. The inner wall of the arc-shaped cylinder is rotatably connected to a pressure roller, and the pressure roller is movably fitted with the unwinding mechanism.

[0011] Furthermore, the unwinding mechanism includes two groups of linkage blocks, both groups of linkage blocks are fixedly connected with limit bolts, and the two groups of limit bolts are movably fitted with two groups of slide grooves respectively, and both groups of linkage blocks are fixedly connected with sliding shafts, and the top ends of the two groups of sliding shafts pass through the top plate, and first springs are arranged between the two groups of linkage blocks and the bottom ends of the top plate, and the two groups of the first springs are respectively sleeved on the two groups of sliding shafts, and an unwinding roller is rotatably connected between the two groups of linkage blocks, and the unwinding roller is movably fitted with the pressure roller.

[0012] Furthermore, a chip box is installed on the slitting mechanism, and a vacuum pump is installed on the chip box. The air inlet end of the vacuum pump is connected to an air inlet pipe, one end of the air inlet pipe extends to the interior of the chip box, and a filter is provided at one end of the air inlet pipe. The air outlet end of the vacuum pump is connected to an air outlet pipe, and the air outlet pipe is connected to the slitting mechanism.

[0013] Furthermore, the slitting mechanism includes a fixed frame, a first motor is installed on one side wall of the fixed frame, the output end of the first motor is transmission-connected to a rotating shaft, a plurality of groups of cutting knives are installed on the rotating shaft, an air guide tube is provided on one side of the fixed frame, the air guide tube is connected with an air outlet pipe, a plurality of groups of blow pipes are connected to the air guide tube, and the plurality of groups of blow pipes correspond to the plurality of groups of cutting knives respectively, a chip guide cover is installed on the other side wall of the fixed frame, two groups of chip guide pipes are connected to the chip guide cover, and the other ends of the two groups of chip guide pipes are connected with the interior of a chip collection box.

[0014] Furthermore, the winding assembly includes two groups of winding brackets, and the two groups of winding brackets are equipped with electric slides, the output ends of the electric slides are transmission-connected to a movable knife seat, and a laser cutting knife is installed on the movable knife seat. A second motor is installed on one group of winding brackets, and the output end of the second motor is transmission-connected to the winding mechanism.

[0015] Furthermore, the winding mechanism includes a transmission shaft, which is rotatably connected between the two groups of winding brackets, one end of the transmission shaft is transmission-connected to the output end of the second motor, a linkage plate is fixedly connected to the transmission shaft, two groups of third motors are installed on the linkage plate, the output ends of the two groups of third motors are transmission-connected to winding shafts, and several groups of limiting parts can be detachably installed on the two groups of winding shafts.

[0016] Furthermore, the limiting part includes a winding drum, both ends of which are provided with partitions, two groups of the partitions and the winding drum are both mounted on the winding shaft, two groups of limiting shafts are provided on the winding drum, extrusion blocks are provided on the two groups of limiting shafts, two groups of second springs are provided between the extrusion blocks and the winding drum, and the two groups of the second springs are respectively mounted on the two groups of limiting shafts.

[0017] Furthermore, a limiting groove is provided on the partition, a fixed shaft is arranged in the limiting groove, a pressure plate is rotatably connected to the fixed shaft, a torsion spring is arranged between the pressure plate and the limiting groove, and the torsion spring is sleeved on the fixed shaft.

[0018] A slitting method of a slitting device for processing pole pieces of lithium-ion batteries, the slitting method comprising:

[0019] Winding the pole piece to be cut on the unwinding mechanism;

[0020] Tensioning one end of the pole piece via a first limiting roller;

[0021] Open the cutting mechanism to cut the pole piece;

[0022] The end of the electrode piece after being cut passes through the second limiting roller for tensioning and limiting, and then is wound to the winding mechanism for winding operation;

[0023] The pole pieces on the coiling mechanism that have completed winding are unloaded to prepare for the next round of winding.

[0024] The beneficial effects of the present invention are:

[0025] 1. By winding the electrode piece to be cut on the unwinding roller, tensioning and limiting one end of the electrode piece through the first limiting roller, cutting the electrode piece through the cutting mechanism, tensioning and limiting the electrode piece through the second limiting roller, and then winding it on the winding assembly for winding, the device can cut the electrode piece into multiple electrode pieces of the same width, and can realize the automatic winding operation of the cut electrode piece, effectively avoiding the damage caused by the scattering of the cut electrode piece while reducing the workload of workers.

[0026] 2. Drive the transmission shaft to rotate through the second motor to move a group of winding shafts to the preset position, and wind the slit pole piece around the limit part on the group of winding shafts. Drive the winding shaft to rotate through the corresponding group of third motors to wind the slit pole piece. When the winding thickness on the group of winding shafts reaches the requirement, drive the transmission shaft to rotate through the second motor to rotate another group of winding shafts to the winding position. Drive the moving knife holder to move through the electric slide to cut the pole piece. Wind the pole piece around another group of winding shafts for winding. For the winding shafts that have completed winding, the slit pole piece can be unloaded and the limit part can be replaced without stopping the device, thereby effectively improving the slitting efficiency of the pole piece.

[0027] 3. The electrode sheet wound on the unwinding roller is pressed against the pressure roller to be squeezed, so that the electrode sheet remains flat during transportation. Two sets of first springs are set so that during the unwinding process of the electrode sheet, the two sets of linkage blocks can drive the unwinding roller to move upward through the tension of the springs, so that the electrode sheet roll is always in contact with the pressure roller, effectively avoiding the electrode sheet roll becoming smaller during the unwinding process, which makes the electrode sheet unable to be tensioned, resulting in the electrode sheet being unable to remain flat during transportation and affecting the cutting effect, thereby effectively improving the cutting accuracy of the electrode sheet.

[0028] 4. The first motor drives the rotating shaft to rotate, so that several groups of cutting knives rotate synchronously to perform the electrode cutting operation. The air is allowed to enter the air guide tube through the air outlet pipe by the vacuum pump, and then blown out through the blow pipe to blow the electrode fragments attached to the cutting knife into the chip guide cover, and then enter the chip collection box through the chip guide cover for centralized treatment, so that the cutting knife keeps the blade clean when cutting the electrode, improving the cutting effect, and the air flow on the surface of the cutting knife is accelerated by the blow pipe, so that the cutting knife is cooled quickly, effectively extending the service life of the cutting knife while avoiding damage to the electrode caused by excessive temperature of the cutting knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the main structure of an embodiment of the present invention is shown;

[0031] Figure 2 A schematic diagram of a main body top view structure according to an embodiment of the present invention is shown;

[0032] Figure 3 A schematic diagram of a top plate and an unwinding mechanism from a side view according to an embodiment of the present invention is shown;

[0033] Figure 4 A schematic structural diagram of a slitting mechanism according to an embodiment of the present invention is shown;

[0034] Figure 5 A schematic structural diagram of a slitting mechanism from another viewing angle according to an embodiment of the present invention is shown;

[0035] Figure 6 A schematic structural diagram of a winding assembly according to an embodiment of the present invention is shown;

[0036] Figure 7 A schematic structural diagram of a winding assembly from another perspective according to an embodiment of the present invention is shown;

[0037] Figure 8 It shows a schematic structural diagram of a coiling mechanism according to an embodiment of the present invention;

[0038] Fig. 9 A schematic diagram of the structure of a limiting portion according to an embodiment of the present invention is shown;

[0039] Fig.10 A partial structural schematic diagram of a partition according to an embodiment of the present invention is shown.

[0040] In the figure: 1, processing table; 2, enclosure; 3, vertical plate; 301, slide; 4, top plate; 5, unwinding mechanism; 501, linkage block; 502, limit bolt; 503, slide shaft; 504, first spring; 505, unwinding roller; 6, slitting mechanism; 601, fixed frame; 602, first motor; 603, rotating shaft; 604, cutting knife; 605, air guide tube; 606, air blowing pipe; 607, chip guide cover; 608, chip guide pipe; 7, chip collecting box; 8, winding assembly; 801, winding bracket; 802, electric slide; 803, movable knife seat; 804, laser cutting knife; 805, winding Material mechanism; 8051, transmission shaft; 8052, linkage plate; 8053, third motor; 8054, take-up shaft; 8055, limiting part; 80551, winding drum; 80552, partition; 80553, limiting shaft; 80554, extrusion block; 80555, second spring; 80556, limiting groove; 80557, fixed shaft; 80558, pressure plate; 80559, torsion spring; 806, second motor; 9, first limiting roller; 10, second limiting roller; 11, vacuum pump; 12, air inlet pipe; 13, air outlet pipe; 14, connecting shaft; 15, arc cylinder; 16, pressure roller. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The embodiment of the present invention provides a slitting device for processing a lithium-ion battery electrode, comprising a processing table 1; illustratively, as Figure 1 and Figure 2 shown.

[0043] Two groups of enclosures 2 are symmetrically arranged on the processing table 1, two groups of vertical plates 3 are arranged at one end of the processing table 1, top plates 4 are arranged at the top ends of the two groups of vertical plates 3, and an unwinding mechanism 5 is arranged between the two groups of vertical plates 3, and the unwinding mechanism 5 is wound with the pole pieces to be cut, and the processing table 1 is also provided with a slitting mechanism 6, and a chip collecting box 7 is installed on the slitting mechanism 6, and the processing table 1 is also provided with a winding assembly 8, and the winding assembly 8 is wound with the pole pieces after cutting;

[0044] A first limiting roller 9 is rotatably connected between the two groups of enclosures 2, and the first limiting roller 9 is arranged between the unwinding mechanism 5 and the slitting mechanism 6. A second limiting roller 10 is rotatably connected between the two groups of enclosures 2, and the second limiting roller 10 is arranged between the slitting mechanism 6 and the winding assembly 8;

[0045] Specifically, the electrode piece to be cut is wound on the unwinding mechanism 5, one end of the electrode piece is tensioned and limited by the first limiting roller 9, the electrode piece is cut by the cutting mechanism 6, and the cut electrode piece is tensioned and limited by the second limiting roller 10 and then wound on the winding assembly 8 for winding, thereby realizing the cutting and automatic winding operation of the electrode piece.

[0046] A vacuum pump 11 is installed on the chip box 7, and the air inlet end of the vacuum pump 11 is connected to an air inlet pipe 12, one end of the air inlet pipe 12 extends to the inside of the chip box 7, and a filter is provided at one end of the air inlet pipe 12, and the air outlet end of the vacuum pump 11 is connected to an air outlet pipe 13, and the air outlet pipe 13 is connected to the slitting mechanism 6;

[0047] Specifically, negative pressure is formed inside the chip box 7 by the vacuum pump 11 , so that the debris generated by the cutting of the pole pieces by the slitting mechanism 6 enters the chip box 7 for collection.

[0048] For example, Figure 3 shown.

[0049] The opposite side walls of the two groups of vertical plates 3 are provided with a slide groove 301, and the bottom end of the top plate 4 is fixedly connected with a plurality of connecting shafts 14, and the bottom ends of the plurality of connecting shafts 14 are provided with an arc cylinder 15, and the inner wall of the arc cylinder 15 is rotatably connected with a pressure roller 16;

[0050] The unwinding mechanism 5 includes two groups of linkage blocks 501, and the two groups of linkage blocks 501 are fixedly connected with limit bolts 502, and the two groups of limit bolts 502 are respectively movably fitted with the two groups of slide grooves 301. The two groups of linkage blocks 501 are fixedly connected with sliding shafts 503, and the top ends of the two groups of sliding shafts 503 pass through the top plate 4. The first springs 504 are arranged between the two groups of linkage blocks 501 and the bottom ends of the top plate 4. The two groups of the first springs 504 are respectively sleeved on the two groups of sliding shafts 503. An unwinding roller 505 is rotatably connected between the two groups of linkage blocks 501, and the unwinding roller 505 is movably fitted with the pressure roller 16.

[0051] Specifically, by making the pressure roller 16 fit against the surface of the unwinding roller 505, the electrode sheet wound on the unwinding roller 505 is squeezed, so that the electrode sheet remains flat during transportation. By setting two groups of first springs 504, during the unwinding process of the electrode sheet, the two groups of linkage blocks 501 can drive the unwinding roller 505 to move upward through the tension of the springs, so that the electrode sheet roll is always in contact with the pressure roller 16, effectively avoiding the electrode sheet roll being unable to be tensioned due to the electrode sheet roll gradually becoming smaller during the unwinding process, resulting in the electrode sheet being unable to remain flat during transportation, affecting the cutting accuracy of the electrode sheet.

[0052] For example, Figure 4 and Figure 5 shown.

[0053] The slitting mechanism 6 includes a fixed frame 601, a first motor 602 is installed on one side wall of the fixed frame 601, the output end of the first motor 602 is connected to a rotating shaft 603, and a plurality of cutting knives 604 are installed on the rotating shaft 603. An air guide tube 605 is provided on one side of the fixed frame 601, and the air guide tube 605 is communicated with the air outlet pipe 13, and a plurality of groups of blowing pipes 606 are connected to the air guide tube 605, and the plurality of groups of blowing pipes 606 correspond to the plurality of cutting knives 604 one by one, respectively. A chip guide cover 607 is installed on the other side wall of the fixed frame 601, and two groups of chip guide pipes 608 are connected to the chip guide cover 607, and the other ends of the two groups of chip guide pipes 608 are communicated with the inside of the chip collecting box 7;

[0054] Specifically, the first motor 602 drives the rotating shaft 603 to rotate, so that several groups of cutting knives 604 rotate synchronously to perform the electrode cutting operation, and the air is allowed to enter the air guide tube 605 through the air outlet pipe 13 by the vacuum pump 11, and then blown out through the blow pipe 606, so that the electrode fragments attached to the cutting knife 604 are blown into the chip guide cover 607, and then enter the chip collection box 7 through the chip guide cover 607 for centralized treatment, so that the cutting knife 604 keeps the blade clean when cutting the electrode, and the cutting effect is improved, and the air flow on the surface of the cutting knife 604 is accelerated by the blow pipe 606, so that the cutting knife 604 is cooled quickly, which effectively extends the service life of the cutting knife 604 while avoiding the damage to the electrode caused by excessive temperature of the cutting knife 604.

[0055] The winding assembly 8 includes two sets of winding brackets 801; illustratively, as Figure 6-8 shown.

[0056] An electric slide 802 is installed on the two groups of winding brackets 801, and the output end of the electric slide 802 is transmission-connected with a movable knife seat 803, and a laser cutting knife 804 is installed on the movable knife seat 803. A winding mechanism 805 is arranged between the two groups of winding brackets 801, and a second motor 806 is installed on one group of winding brackets 801, and the output end of the second motor 806 is transmission-connected with the winding mechanism 805;

[0057] The winding mechanism 805 includes a transmission shaft 8051, which is rotatably connected between the two groups of winding brackets 801, one end of the transmission shaft 8051 is transmission-connected to the output end of the second motor 806, a linkage plate 8052 is fixedly connected to the transmission shaft 8051, and two groups of third motors 8053 are installed on the linkage plate 8052, and the output ends of the two groups of the third motors 8053 are both transmission-connected to the winding shaft 8054, and the two groups of the winding shafts 8054 can be detachably installed with a plurality of groups of limit parts 8055;

[0058] Specifically, the transmission shaft 8051 is driven to rotate by the second motor 806, so that a group of winding shafts 8054 are moved to a preset position, and the slit pole piece is wound on the limit part 8055 on the group of winding shafts 8054, and the winding shaft 8054 is driven to rotate by a corresponding group of third motors 8053 to reel in the slit pole piece. When the thickness of the winding on the group of winding shafts 8054 reaches the requirement, the transmission shaft 8051 is driven to rotate by the second motor 806, so that another group of winding shafts 8054 are rotated to the reeling position, and the movable knife holder 803 is driven to move by the electric slide 802, and the pole piece is cut by the laser cutting knife 804, and the pole piece is wound on another group of winding shafts 8054 for reeling. For the winding shaft 8054 that has completed reeling, the slit pole piece can be unloaded and the limit part 8055 can be replaced without stopping the device.

[0059] The limiting portion 8055 includes a coil drum 80551; illustratively, as Fig. 9 and Fig.10 shown.

[0060] Both ends of the winding drum 80551 are provided with partitions 80552, and the two groups of the partitions 80552 and the winding drum 80551 are sleeved on the winding shaft 8054. The winding drum 80551 is provided with two groups of limit shafts 80553, and the two groups of the limit shafts 80553 are provided with extrusion blocks 80554. Two groups of second springs 80555 are provided between the extrusion blocks 80554 and the winding drum 80551, and the two groups of the second springs 80555 are sleeved on the two groups of limit shafts 80553 respectively.

[0061] The partition plate 80552 is provided with a limiting groove 80556, a fixed shaft 80557 is arranged in the limiting groove 80556, a pressing plate 80558 is rotatably connected to the fixed shaft 80557, a torsion spring 80559 is arranged between the pressing plate 80558 and the limiting groove 80556, and the torsion spring 80559 is sleeved on the fixed shaft 80557;

[0062] Specifically, in the initial state, the tension of the second spring 80555 causes the two groups of limiting shafts 80553 to drive the extrusion block 80554 to extend to the outside of the winding drum 80551, so that the two ends of the extrusion block 80554 respectively squeeze the two groups of pressure plates 80558, and limit the pressure plates 80558 in the corresponding group of limiting grooves 80556. When the limiting portion 8055 is ready to reel up the electrode piece, the electrode piece squeezes the extrusion block 80554, so that the extrusion block 80554 moves downward into the winding drum 80551, so that the two ends of the extrusion block 80554 are respectively separated from the two groups of pressure plates 80558. Through the tension of the torsion spring 80559, the pressure plate 80558 rotates and squeezes the electrode piece attached to the winding drum 80551, so that after the electrode piece is cut off, the end of the electrode piece is fixedly attached to the winding drum 80551, which is convenient for reeling up the electrode piece.

[0063] The working principle of the electrode sheet slitting device for lithium-ion battery processing proposed by the present invention is as follows:

[0064] By winding the electrode to be cut on the unwinding roller 505, the pressure roller 16 is pressed against the electrode wound on the unwinding roller 505 to squeeze it, so that the electrode remains flat during transportation. By setting two groups of first springs 504, during the electrode unwinding process, the two groups of linkage blocks 501 can drive the unwinding roller 505 to move upward through the tension of the springs, so that the electrode roll is always in contact with the pressure roller 16, effectively avoiding the electrode roll being unable to be tensioned due to the electrode roll gradually becoming smaller during the unwinding process, resulting in the electrode roll being unable to remain flat during transportation, affecting the cutting accuracy of the electrode sheet.

[0065] One end of the pole piece is tensioned and limited by the first limiting roller 9, and the rotating shaft 603 is driven to rotate by the first motor 602, so that several groups of cutting knives 604 rotate synchronously to perform the cutting operation on the pole piece, and the air is allowed to enter the air guide tube 605 through the air outlet pipe 13 by the vacuum pump 11, and then blown out through the blowing pipe 606, so that the pole piece debris attached to the cutting knife 604 is blown into the chip guide cover 607, and then enters the chip collection box 7 through the chip guide cover 607 for centralized treatment, so that the cutting knife 604 keeps the blade clean when cutting the pole piece, and the cutting effect is improved, and the air flow on the surface of the cutting knife 604 is accelerated by the blowing pipe 606, so that the cutting knife 604 is cooled quickly, which effectively extends the service life of the cutting knife 604 while avoiding the damage to the pole piece caused by excessive temperature of the cutting knife 604.

[0066] The electrode pieces after slitting are tensioned and limited by the second limiting roller 10, and then wound onto the winding assembly 8 for winding. The transmission shaft 8051 is driven to rotate by the second motor 806, so that a group of winding shafts 8054 are moved to a preset position, and the electrode pieces after slitting are wound onto the limiting part 8055 on the group of winding shafts 8054. The winding shafts 8054 are driven to rotate by a corresponding group of third motors 8053 to wind up the electrode pieces after slitting. When the thickness of the winding on the group of winding shafts 8054 is When the required degree is reached, the transmission shaft 8051 is driven to rotate by the second motor 806, so that another set of winding shafts 8054 is rotated to the winding position, and the movable knife holder 803 is driven to move by the electric slide 802, and the pole piece is cut by the laser cutting knife 804, so that the pole piece is wound onto another set of winding shafts 8054 for winding. For the winding shaft 8054 that has completed winding, the cut pole piece can be unloaded and a new limiting part 8055 can be replaced without stopping the device.

[0067] In the initial state, the tension of the second spring 80555 causes the two sets of limiting shafts 80553 to drive the extrusion block 80554 to extend to the outside of the winding drum 80551, so that the two ends of the extrusion block 80554 respectively squeeze the two sets of pressure plates 80558, and limit the pressure plates 80558 in the corresponding set of limiting grooves 80556. When the limiting part 8055 is ready to reel up the electrode piece, the electrode piece squeezes the extrusion block 80554, so that the extrusion block 80554 moves downward into the winding drum 80551, so that the two ends of the extrusion block 80554 are respectively separated from the two sets of pressure plates 80558. Through the tension of the torsion spring 80559, the pressure plate 80558 rotates and squeezes the electrode piece attached to the winding drum 80551, so that after the electrode piece is cut off, the end of the electrode piece is fixed and attached to the winding drum 80551, which is convenient for reeling up the electrode piece.

[0068] Based on the above-mentioned electrode sheet slitting device for lithium-ion battery processing, the embodiment of the present invention further proposes a slitting method for the slitting device. Exemplarily, the slitting method includes:

[0069] The electrode to be cut is wound on the unwinding roller, and the pressing roller squeezes the electrode to keep it flat during transportation;

[0070] One end of the pole piece is tensioned via the first limiting roller, and the first motor is turned on to make several groups of cutting knives rotate synchronously to cut the pole piece;

[0071] Turn on the vacuum pump to cool the cutting blade and at the same time suck the debris attached to the cutting blade into the chip collection box for centralized treatment;

[0072] The ends of the electrode pieces after being cut pass through the second limiting roller for tensioning and limiting, and are then respectively wound onto limiting parts on a group of winding shafts for fixing;

[0073] Turn on the third motor corresponding to the group of winding shafts, so that the winding shaft drives the limit part to rotate and perform the winding operation;

[0074] After the winding of the winding shaft is completed, the second motor is turned on to switch the positions of the two winding shafts;

[0075] Turn on the electric slide and the laser cutting knife to cut off the pole piece, so that the end of the pole piece is fixed to the limit part on another set of winding shafts to continue winding;

[0076] The pole piece on the winding shaft that has completed winding is unloaded, and a new limit part is replaced to prepare for the next round of winding.

[0077] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for cutting pole pieces for processing lithium-ion batteries, comprising a processing table (1), characterized in that: Two groups of vertical plates (3) are arranged at one end of the processing table (1), and an unwinding mechanism (5) is arranged between the two groups of vertical plates (3), and the pole pieces to be cut are wound on the unwinding mechanism (5); The processing table (1) is also provided with a slitting mechanism (6), and the processing table (1) is also provided with a winding component (8); Two groups of enclosures (2) are symmetrically arranged on the processing table (1), and a first limiting roller (9) and a second limiting roller (10) are rotatably connected between the two groups of enclosures (2); The winding assembly (8) comprises two groups of winding brackets (801), and a material winding mechanism (805) is provided between the two groups of winding brackets (801); The electrode piece to be cut is wound onto an unwinding mechanism (5), one end of the electrode piece is tensioned and limited via a first limiting roller (9), the electrode piece is cut via a cutting mechanism (6), and the cut electrode piece is tensioned and limited via a second limiting roller (10) before being wound onto a winding mechanism (805) for winding.

2. The electrode sheet slitting device for lithium-ion battery processing according to claim 1, characterized in that: A top plate (4) is provided at the top of the two groups of vertical plates (3), and a slide groove (301) is provided on the opposite side walls of the two groups of vertical plates (3). The bottom end of the top plate (4) is fixedly connected to a plurality of groups of connecting shafts (14), and the bottom ends of the plurality of groups of connecting shafts (14) are provided with an arc-shaped cylinder (15). The inner wall of the arc-shaped cylinder (15) is rotatably connected to a pressure roller (16), and the pressure roller (16) is movably fitted with the unwinding mechanism (5).

3. The electrode sheet slitting device for lithium-ion battery processing according to claim 2, characterized in that: The unwinding mechanism (5) comprises two groups of linkage blocks (501), the two groups of linkage blocks (501) are fixedly connected with limit pins (502), the two groups of limit pins (502) are respectively movably fitted with the two groups of slide grooves (301), the two groups of linkage blocks (501) are fixedly connected with sliding shafts (503), the top ends of the two groups of sliding shafts (503) pass through the top plate (4), a first spring (504) is arranged between the two groups of linkage blocks (501) and the bottom ends of the top plate (4), the two groups of first springs (504) are respectively sleeved on the two groups of sliding shafts (503), an unwinding roller (505) is rotatably connected between the two groups of linkage blocks (501), and the unwinding roller (505) is movably fitted with the pressure roller (16).

4. The electrode sheet slitting device for lithium-ion battery processing according to claim 1, characterized in that: A chip collecting box (7) is installed on the slitting mechanism (6), and a vacuum pump (11) is installed on the chip collecting box (7); an air inlet end of the vacuum pump (11) is connected to an air inlet pipe (12), one end of the air inlet pipe (12) extends to the interior of the chip collecting box (7), and a filter is provided at one end of the air inlet pipe (12); an air outlet end of the vacuum pump (11) is connected to an air outlet pipe (13), and the air outlet pipe (13) is connected to the slitting mechanism (6).

5. The electrode sheet cutting device for lithium-ion battery processing according to claim 4, characterized in that The slitting mechanism (6) comprises a fixed frame (601), a first motor (602) is mounted on one side wall of the fixed frame (601), an output end of the first motor (602) is drivingly connected to a rotating shaft (603), a plurality of groups of cutting knives (604) are mounted on the rotating shaft (603), an air guide tube (605) is arranged on one side of the fixed frame (601), the air guide tube (605) is communicated with an air outlet pipe (13), a plurality of groups of air outlet pipes (606) are connected to the air guide tube (605), and the plurality of groups of air outlet pipes (606) correspond to the plurality of groups of cutting knives (604) respectively, and a chip guide cover (607) is mounted on the other side wall of the fixed frame (601), the chip guide cover (607) is communicated with two groups of chip guide pipes (608), and the other ends of the two groups of chip guide pipes (608) are communicated with the inside of a chip collecting box (7).

6. The electrode sheet slitting device for lithium-ion battery processing according to claim 1, characterized in that: The winding assembly (8) comprises two groups of winding brackets (801), the two groups of winding brackets (801) are equipped with electric slides (802), the output end of the electric slides (802) is transmission-connected to a movable knife seat (803), the movable knife seat (803) is equipped with a laser cutting knife (804), and one group of winding brackets (801) is equipped with a second motor (806), the output end of the second motor (806) is transmission-connected to a coiling mechanism (805).

7. The electrode sheet slitting device for lithium-ion battery processing according to claim 6, characterized in that: The material winding mechanism (805) comprises a transmission shaft (8051), the transmission shaft (8051) being rotatably connected between the two groups of winding brackets (801), one end of the transmission shaft (8051) being transmission-connected to the output end of the second motor (806), a linkage plate (8052) being fixedly connected to the transmission shaft (8051), two groups of third motors (8053) being mounted on the linkage plate (8052), the output ends of the two groups of third motors (8053) being transmission-connected to winding shafts (8054) being mounted thereon, and a plurality of groups of limiting portions (8055) being detachably mounted on the two groups of winding shafts (8054).

8. The electrode sheet slitting device for lithium-ion battery processing according to claim 7, characterized in that: The limiting portion (8055) comprises a winding drum (80551), both ends of which are provided with partitions (80552), two groups of the partitions (80552) and the winding drum (80551) are both sleeved on the winding shaft (8054), two groups of limiting shafts (80553) are provided on the winding drum (80551), the two groups of limiting shafts (80553) are provided with extrusion blocks (80554), two groups of second springs (80555) are provided between the extrusion blocks (80554) and the winding drum (80551), and the two groups of the second springs (80555) are respectively sleeved on the two groups of limiting shafts (80553).

9. The electrode sheet slitting device for lithium-ion battery processing according to claim 8, characterized in that: The partition plate (80552) is provided with a limiting groove (80556), a fixed shaft (80557) is arranged in the limiting groove (80556), a pressing plate (80558) is rotatably connected to the fixed shaft (80557), a torsion spring (80559) is arranged between the pressing plate (80558) and the limiting groove (80556), and the torsion spring (80559) is sleeved on the fixed shaft (80557).

10. A slitting method applied to the slitting device for processing pole pieces of lithium ion batteries according to any one of claims 1 to 9, characterized in that: The slitting method comprises: Winding the pole piece to be cut on the unwinding mechanism; Tensioning one end of the pole piece via a first limiting roller; Open the cutting mechanism to cut the pole piece; The end of the electrode piece after being cut passes through the second limiting roller for tensioning and limiting, and then is wound to the winding mechanism for winding operation; The pole pieces on the coiling mechanism that have completed winding are unloaded to prepare for the next round of winding.

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