Three-cutter-shaft slitting device

Abstract

The utility model discloses a slitting device with three cutter shafts, which relates to the technical field of lithium battery preparation and comprises a cutter holder, an upper slitting cutter mechanism, a middle slitting cutter mechanism and a lower slitting cutter mechanism, the upper slitting cutter mechanism, the middle slitting cutter mechanism and the lower slitting cutter mechanism are mounted in the cutter holder, and the cutter holder is provided with a plurality of cutter shafts. The middle slitting knife mechanism is located between the upper slitting knife mechanism and the lower slitting knife mechanism, a foil area cutting area is formed between the upper slitting knife mechanism and the middle slitting knife mechanism, a material area cutting area is formed between the middle slitting knife mechanism and the lower slitting knife mechanism, and a pole piece can enter from the foil area cutting area. And the material area penetrates out of the material area cutting area. According to the utility model, pole pieces can be divided into multiple pieces, and foil cutting and material cutting can be carried out simultaneously; each slitting parameter of the foil area and the material area can be independently controlled, on the premise that the slitting efficiency is guaranteed, independent control over the foil area technology and the material area technology is achieved, the slitting quality of the pole piece is improved, and the probability of burrs and powder falling is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery preparation, in particular to a three-shaft slitting device. Background Art

[0002] As a high specific energy power source, lithium-ion batteries are widely used due to their advantages such as high operating voltage, light weight, high specific energy, low self-discharge rate, long cycle life, no memory effect, and no environmental pollution. The electrode, as one of the key components of lithium-ion batteries, has a vital influence on the electrical properties of lithium-ion batteries.

[0003] Pole piece production is the basic process for manufacturing lithium-ion power batteries, and it has very high requirements for equipment accuracy, intelligence level, and reliability of production performance. Pole piece slitting is the equipment that slits the rolled battery pole pieces according to the battery specifications. The main technical requirements are that the pole pieces cannot be wrinkled or powdered after slitting, and the slitting size must be highly accurate. At the same time, the burrs on the edge of the pole piece must be small, otherwise dendrites will be generated on the burrs and pierce the diaphragm, causing a short circuit in the battery. At the same time, in pursuit of higher production efficiency, coating is mostly done on multiple pole pieces. Generally, the slitting mechanism is mostly for slitting in the foil area only, and a separate slitting device is required for secondary slitting of the pole piece, or the foil area and the material area are slid at the same time, but burrs and powder loss are easy to occur, which greatly wastes manpower and material resources. Utility Model Content

[0004] The purpose of the utility model is to provide a three-shaft slitting device for solving the above technical problems.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A three-shaft slitting device comprises a knife seat, an upper slitting knife mechanism, a middle slitting knife mechanism and a lower slitting knife mechanism, wherein the upper slitting knife mechanism, the middle slitting knife mechanism and the lower slitting knife mechanism are installed in the knife seat, and the middle slitting knife mechanism is located between the upper slitting knife mechanism and the lower slitting knife mechanism, a foil area slitting zone is formed between the upper slitting knife mechanism and the middle slitting knife mechanism, and a material area slitting zone is formed between the middle slitting knife mechanism and the lower slitting knife mechanism, and an electrode piece can enter from the foil area slitting zone and pass through the material area slitting zone.

[0007] Preferably, the upper slitting knife mechanism comprises an upper slitting knife shaft and a plurality of foil area upper slitting knives arranged on the outer wall of the upper slitting knife shaft.

[0008] As a further preference, the center slitting knife mechanism includes a center slitting knife shaft and a material area lower slitting knife and a foil area lower slitting knife arranged on the outer wall of the center slitting knife shaft, and the foil area lower slitting knife is arranged opposite to the foil area upper slitting knife.

[0009] As a further preference, the lower slitting knife mechanism comprises a lower slitting knife shaft and an upper material area slitting knife arranged on the outer wall of the lower slitting knife shaft, and the upper material area slitting knife is arranged opposite to the lower material area slitting knife.

[0010] As a further preference, it also includes a motor, and one end of the upper slitting blade shaft, one end of the middle slitting blade shaft and one end of the lower slitting blade shaft respectively pass through the blade seat and are transmission connected to the motor.

[0011] As a further preference, a foil area lower slitting knife is provided between two adjacent material area lower slitting knives.

[0012] As a further preference, the foil area lower slitting knife includes a foil area lower slitting knife sleeve, the foil area lower slitting knife sleeve is arranged on the outer peripheral wall of the middle slitting knife shaft, and a boss is provided in the middle of the foil area lower slitting knife sleeve, and the boss is arranged in a ring shape.

[0013] As a further preference, a groove is provided on the outer peripheral wall of the boss.

[0014] As a further preference, the other end of the upper slitting blade shaft, the other end of the middle slitting blade shaft and the other end of the lower slitting blade shaft are rotatably connected to the blade seat respectively.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] In the utility model, through the arrangement of the upper slitting knife mechanism, the middle slitting knife mechanism and the lower slitting knife mechanism, compared with the mechanism of only slitting the foil area or only slitting the material area, the utility model can divide the electrode into multiple parts and cut the foil and material at the same time; and various slitting parameters of the foil area and the material area can be controlled separately. Under the premise of ensuring the slitting efficiency, the processes of the foil area and the material area are controlled separately, which further improves the slitting quality of the electrode and reduces the probability of burrs and powder falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the three-shaft slitting device in the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the pole piece when being cut in the utility model;

[0019] Figure 3 The utility model is a schematic structural diagram of the lower slitting knife in the middle foil area on the middle slitting knife shaft.

[0020] In the figure: 1. knife holder; 2. upper slitting knife mechanism; 21. upper slitting knife shaft; 22. upper slitting knife for foil area; 3. middle slitting knife mechanism; 31. middle slitting knife shaft; 32. lower slitting knife for material area; 33. lower slitting knife for foil area; 34. knife sleeve for lower slitting knife for foil area; 35. boss; 36. groove; 4. lower slitting knife mechanism; 41. lower slitting knife shaft; 42. upper slitting knife for material area; 5. pole piece; 6. foil area slitting knife assembly; 7. material area slitting knife assembly. DETAILED DESCRIPTION

[0021] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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.

[0022] In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected 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.

[0024] Figure 1 It is a structural schematic diagram of the three-shaft slitting device in the utility model; Figure 2 It is a schematic diagram of the structure of the pole piece when being cut in the utility model; Figure 3 This is a schematic diagram of the structure of the lower slitting knife in the middle foil area of ​​the utility model on the middle slitting knife shaft, please refer to Figures 1 to 3As shown, a preferred embodiment is shown, which shows a three-shaft slitting device, including a knife seat 1, an upper slitting knife mechanism 2, a middle slitting knife mechanism 3 and a lower slitting knife mechanism 4. The upper slitting knife mechanism 2, the middle slitting knife mechanism 3 and the lower slitting knife mechanism 4 are installed in the knife seat 1, and the middle slitting knife mechanism 3 is located between the upper slitting knife mechanism 2 and the lower slitting knife mechanism 4. A foil slitting area is formed between the upper slitting knife mechanism 2 and the middle slitting knife mechanism 3, and a material slitting area is formed between the middle slitting knife mechanism 3 and the lower slitting knife mechanism 4. The pole piece 5 can enter from the foil slitting area and pass through the material slitting area. In this embodiment, see Figure 1 As shown, the upper slitting knife mechanism 2, the middle slitting knife mechanism 3 and the lower slitting knife mechanism 4 are sequentially distributed from top to bottom in the knife holder 1, wherein the foil area slitting area is formed between the upper slitting knife mechanism 2 and the middle slitting knife mechanism 3, for the electrode 5 to enter, so as to facilitate cutting of both sides of the electrode 5 and removal of burrs of the electrode 5. The material area slitting area is formed between the middle slitting knife mechanism 3 and the lower slitting knife mechanism 4, for the electrode 5 to pass out, so as to facilitate slitting of the electrode 5.

[0025] Further, as a preferred embodiment, the upper slitting knife mechanism 2 includes an upper slitting knife shaft 21 and a plurality of foil area upper slitting knives 22 arranged on the outer wall of the upper slitting knife shaft 21. Figure 1 As shown, the foil area upper slitting knife 22 is arranged on the outer peripheral wall of the upper slitting knife shaft 21 and is fixedly connected to the upper slitting knife shaft 21, and can be integrally formed or welded.

[0026] Further, as a preferred embodiment, the center slitting mechanism 3 includes a center slitting shaft 31 and a material area lower slitting knife 32 and a foil area lower slitting knife 33 arranged on the outer wall of the center slitting shaft 31, and the foil area lower slitting knife 33 is arranged opposite to the foil area upper slitting knife 22. The foil area lower slitting knife 33 is used to cooperate with the foil area upper slitting knife 22 to achieve cutting of the side position of the electrode sheet 5, and the foil area lower slitting knife 33 is arranged on the outer peripheral wall of the center slitting shaft 31 and is integrally connected to the center slitting shaft 31.

[0027] Further, as a preferred embodiment, the lower slitting knife mechanism 4 includes a lower slitting knife shaft 41 and a material area upper slitting knife 42 arranged on the outer wall of the lower slitting knife shaft 41, and the material area upper slitting knife 42 is arranged opposite to the material area lower slitting knife 32. Among them, the material area upper slitting knife 42 is used to cooperate with the material area lower slitting knife 32 to achieve the slitting of the electrode 5, and the material area upper slitting knife 42 is connected and fixed to the lower slitting knife shaft 41. Among them, the electrode 5 can enter between the upper slitting knife shaft 21 and the middle slitting knife shaft 31, bypass the middle slitting knife shaft 31, and pass through between the middle slitting knife shaft 31 and the lower slitting knife shaft 41. Among them, the foil area lower slitting knife 33 and the foil area upper slitting knife 22 arranged opposite to each other form the foil area slitting knife assembly 6, and the material area upper slitting knife 42 and the material area lower slitting knife 32 form the material area slitting knife assembly 7.

[0028] Furthermore, as a preferred embodiment, a motor (not shown in the figure) is further included, and one end of the upper slitting blade shaft 21, one end of the middle slitting blade shaft 31 and one end of the lower slitting blade shaft 41 respectively pass through the blade holder 1 and are connected to a motor transmission. The upper slitting blade shaft 21, the middle slitting blade shaft 31 and the lower slitting blade shaft 41 can be directly driven by the motor to rotate independently, and three motors are provided. The motor and the upper slitting blade shaft 21, the middle slitting blade shaft 31 and the lower slitting blade shaft 41 can be matched by means of gears or belts, etc., wherein the transmission connection between the motor and the upper slitting blade shaft 21, the middle slitting blade shaft 31 and the lower slitting blade shaft 41 belongs to the prior art and will not be described in detail here.

[0029] In this embodiment, the upper slitting knife shaft 21, the middle slitting knife shaft 31 and the lower slitting knife shaft 41 are driven by a motor to rotate independently, so that the relevant parameters of the upper slitting knife 22 of the foil area, the lower slitting knife 32 of the material area, the lower slitting knife 33 of the foil area and the upper slitting knife 42 of the material area can be controlled, which can solve the problem of different requirements for the slitting speed of the foil area and the slitting speed of the material area, and can better solve the problem of burr control of the electrode 5. Among them, the rotational speeds of the upper slitting knife shaft 21, the middle slitting knife shaft 31 and the lower slitting knife shaft 41 can be set separately. For example, the ratio of the rotational speed of the upper slitting knife shaft 21 to the rotational speed of the middle slitting knife shaft 31 is (1-3):1, and the ratio of the rotational speed of the lower slitting knife shaft 41 to the rotational speed of the middle slitting knife shaft 31 is (1-1.5):1. The cutting amount and the cutting amount between the upper slitting knife 22 in the foil area and the lower slitting knife 33 in the foil area, as well as the cutting amount and the cutting amount between the lower slitting knife 32 in the material area and the upper slitting knife 42 in the material area can be independently adjusted to meet the corresponding process requirements.

[0030] Furthermore, as a preferred embodiment, a foil area lower slitting knife 33 is provided between two adjacent material area lower slitting knives 32 .

[0031] Further, as a preferred embodiment, the foil area lower slitting knife 33 includes a foil area lower slitting knife sheath 34, which is arranged on the outer peripheral wall of the middle slitting knife shaft 31, and a boss 35 is arranged in the middle of the foil area lower slitting knife sheath 34, and the boss 35 is arranged in a ring shape. The height of the boss 35 is 0.5-1mm, and the width is 1-2mm. Among them, a groove 36 is opened on the outer peripheral wall of the boss 35, and when the foil area upper slitting knife 22 presses down to cut the electrode 5, the electrode 5 has an outward force. When the foil area upper slitting knife 22 cuts the electrode 5, the electrode 5 on both sides can be separated instantly without interfering with each other to produce burrs and dust.

[0032] Further, as a preferred embodiment, the other end of the upper slitting blade shaft 21, the other end of the middle slitting blade shaft 31 and the other end of the lower slitting blade shaft 41 are rotatably connected to the blade holder 1. Among them, a mounting hole for mounting the upper slitting blade shaft 21, the middle slitting blade shaft 31 and the lower slitting blade shaft 41 is provided on the inner wall of one end of the blade holder 1. One end of the upper slitting blade shaft 21, the middle slitting blade shaft 31 and the lower slitting blade shaft 41 can pass through the other end of the blade holder 1 and be connected to the motor disposed outside the blade holder 1.

[0033] When in use, the pole piece 5 first passes through the foil area cutting area and then continues to pass through the material area cutting area along the middle cutting knife shaft 31, so that the pole piece 5 is first cut into the foil area and then into the material area on the same cutting equipment. During the cutting process, adjusting the upper cutting knife shaft 21 and the middle cutting knife shaft 31 can control the cutting amount and contact amount of the upper cutting knife 22 and the lower cutting knife 33 of the foil area, as well as the rotation speed of the upper cutting knife 22 and the lower cutting knife 33 of the foil area; adjusting the middle cutting knife shaft 31 and the lower cutting knife shaft 41 can control the cutting amount and contact amount of the lower cutting knife 32 and the upper cutting knife 42 of the material area, as well as the rotation speed of the lower cutting knife 32 and the upper cutting knife 42 of the material area. This can improve the burrs and powder loss problems of the pole piece 5.

[0034] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-shaft slitting device, characterized in that: It includes a knife seat, an upper cutting knife mechanism, a middle cutting knife mechanism and a lower cutting knife mechanism, wherein the upper cutting knife mechanism, the middle cutting knife mechanism and the lower cutting knife mechanism are installed in the knife seat, and the middle cutting knife mechanism is located between the upper cutting knife mechanism and the lower cutting knife mechanism, a foil cutting area is formed between the upper cutting knife mechanism and the middle cutting knife mechanism, and a material cutting area is formed between the middle cutting knife mechanism and the lower cutting knife mechanism, and the electrode can enter from the foil cutting area and pass through the material cutting area.

2. The three-shaft slitting device according to claim 1, characterized in that: The upper slitting knife mechanism comprises an upper slitting knife shaft and a plurality of foil area upper slitting knives arranged on the outer wall of the upper slitting knife shaft.

3. The three-shaft slitting device according to claim 2, characterized in that: The center slitting knife mechanism comprises a center slitting knife shaft and a material area lower slitting knife and a foil area lower slitting knife arranged on the outer wall of the center slitting knife shaft, and the foil area lower slitting knife is arranged opposite to the foil area upper slitting knife.

4. The three-shaft slitting device according to claim 3, characterized in that: The lower slitting knife mechanism comprises a lower slitting knife shaft and an upper material area slitting knife arranged on the outer wall of the lower slitting knife shaft, and the upper material area slitting knife is arranged opposite to the lower material area slitting knife.

5. The three-shaft slitting device according to claim 4, characterized in that: It also includes a motor, and one end of the upper slitting blade shaft, one end of the middle slitting blade shaft and one end of the lower slitting blade shaft respectively pass through the blade seat and are transmission-connected to the motor.

6. The three-shaft slitting device according to claim 3, characterized in that: A foil area lower cutting knife is arranged between two adjacent material area lower cutting knives.

7. The three-shaft slitting device according to claim 4, characterized in that: The foil area lower slitting knife comprises a foil area lower slitting knife sleeve, the foil area lower slitting knife sleeve is arranged on the outer peripheral wall of the middle slitting knife shaft, and a boss is arranged in the middle of the foil area lower slitting knife sleeve, and the boss is arranged in an annular shape.

8. The three-shaft slitting device according to claim 7, characterized in that: A groove is formed on the outer peripheral wall of the boss.

9. The three-shaft slitting device according to claim 4, characterized in that: The other end of the upper slitting blade shaft, the other end of the middle slitting blade shaft and the other end of the lower slitting blade shaft are rotatably connected to the blade seat respectively.

Images