Cutting device for lithium capacitor or lithium battery pole piece

Abstract

The cutting device for the lithium capacitor or the lithium battery pole piece comprises an upper cutter and a lower cutter, a lower cutter frame is arranged below the lower cutter, and a negative pressure dust collection mechanism is arranged at the position, corresponding to the attaching position of the upper cutter and the lower cutter, of the lower cutter frame. The lower cutter is provided with a containing groove used for containing a pole piece, the length of the upper cutter is larger than the width of the containing groove, cutting parts are arranged on the side, facing the lower cutter, of the upper cutter, the two cutting parts correspond to the left end and the right end of the upper cutter, and each cutting part is obliquely arranged on the upper cutter. And the obliquely upward end of each cutting part faces the middle part of the upper cutter. The cutting device for the pole piece of the lithium capacitor or the lithium battery can be suitable for cutting the pole piece, has the advantages of being simple in structure and good in cutting effect, can reduce the probability that dust falls on the pole piece, and is beneficial to reducing the probability that follow-up battery cell short circuit occurs and self-discharge is abnormal.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of pole piece processing equipment, especially a kind of cutting device for lithium capacitor or lithium battery pole piece. BACKGROUND

[0002] The last process of electrode segment manufactured by lithium capacitor or lithium battery needs to cut the electrode in roll into sheet pole piece according to fixed size specification, and the thickness of pole piece is usually 50-200um, the pole piece is relatively thin, the middle is aluminum foil or copper foil, and the upper / lower surface is coated with electrode powder, when cutting, cutting tool acts on pole piece, and pole piece is cut off by shearing force, a large amount of dust and dropping material will be generated in cutting process, in the later assembly formation segment, electrode dust foreign matter acts on diaphragm, and diaphragm is punctured, positive and negative short circuit occurs, and there is fire risk, and the later self-discharge of the battery cell with no obvious short circuit leads to abnormal electrical performance.In addition, the material residue of dropping material will also cause the risk of breaking diaphragm in assembly segment.Currently, the thickness of diaphragm is usually about 8-20um, and diaphragm gradually develops in the direction of lightness and thinness, and the abnormality such as cutting dust and dropping material has more and more significant influence on product safety.

[0003] Currently, the electrode segment pole piece cutting mainly uses upper / lower cutting tool engagement shearing, and pole piece is cut off by shearing force, and in order to reduce dropping material, oblique cutting tool is usually used instead of flat cutting tool.Due to the development of capacitor or battery in the direction of long size, for the cutting of such pole piece, when using oblique cutting tool, one side of pole piece first contacts upper cutting tool, pole piece is cut, the other side of pole piece contacts upper cutting tool, and pole piece is cut off as a whole, and when cutting in this way, the stress of both ends of pole piece is uneven, one side is stressed first, and the other side is stressed later, and problems such as one-side stress deviation of pole piece, serious one-side dropping material and large pole piece size fluctuation occur, and burr and burr are more likely to occur.Due to the fact that the industry currently uses video microscope for offline sampling inspection to detect burr and burr, 100% CCD full inspection cannot be carried out, and there is a great risk of battery fire caused by pole piece cutting defect flowing out, therefore, it is urgent to improve the cutting method of cutting tool to reduce the problems such as burr and burr that affect the safety and yield of battery cell. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model aims at providing a kind of cutting device for lithium capacitor or lithium battery pole piece to solve the problems such as burr and burr that exist in the cutting method of cutting tool for existing lithium capacitor or lithium battery pole piece, and affect the safety and yield of battery cell.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] The application discloses a cutting device for lithium capacitor or lithium battery pole piece, which comprises upper and lower cutters, wherein the lower cutter is provided with a lower cutter holder below, and a negative pressure dust collection mechanism is arranged on the lower cutter holder corresponding to the joint of the upper and lower cutters; the lower cutter is provided with a containing groove for containing the pole piece, the length of the upper cutter is greater than the width of the containing groove, the side of the upper cutter facing the lower cutter is provided with cutting parts, two cutting parts are arranged corresponding to the left and right ends of the upper cutter, and each cutting part is arranged on the upper cutter in an inclined mode, and the end of each cutting part inclined upward is arranged towards the middle part of the upper cutter.

[0007] Further, the negative pressure dust collection mechanism comprises dust suction holes arranged on the lower cutter holder, and the dust suction holes are arranged at least in two groups along the length direction of the upper cutter.

[0008] Further, the negative pressure dust collection mechanism further comprises a dust suction pipe arranged below the lower cutter holder, and the dust suction pipe is communicated with the dust suction holes.

[0009] Further, the dust suction pipe is detachably arranged on the lower cutter holder.

[0010] Further, a plurality of negative pressure suction holes are arranged on the lower cutter corresponding to the positions of the containing grooves, one end of each negative pressure suction hole is communicated with the dust suction hole, and the other end is communicated with the containing groove.

[0011] Further, the included angle between the cutting part and the lower cutter is 2°.

[0012] Compared with the prior art, the cutting device for lithium capacitor or lithium battery pole piece has the following advantages.

[0013] The cutting device for lithium capacitor or lithium battery pole piece can be applied to the cutting of the pole piece, has the advantages of simple structure and good cutting effect, and can reduce the probability of dust falling on the pole piece, thereby being favorable for reducing the probability of subsequent cell short circuit and self-discharge abnormality. By arranging the containing grooves on the lower cutter and arranging the negative pressure suction holes communicated with the containing grooves, the negative pressure dust collection mechanism can not only collect the dust, but also can realize the negative pressure adsorption of the pole piece in the containing groove, thereby being favorable for improving the stability of the pole piece in the cutting process, so that the two cutting parts on the upper cutter can cut the pole piece with symmetrical and uniform stress on the two sides of the pole piece, and the pole piece has less dropping material and is not prone to generate burrs, burrs and other adverse problems. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings constituting a part of the application are used to provide a further understanding of the application, and the illustrative embodiments of the application and the description thereof are used to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0015] Figure 1The structure schematic view of the cutting device for lithium capacitor or lithium battery pole piece is shown in the embodiment of the utility model.

[0016] Figure 2 For Figure 1 The explosion map.

[0017] Marked with reference numerals:

[0018] 1, lower cutter; 2, upper cutter; 3, cutting part; 4, containing groove; 5, lower cutter holder; 6, dust suction hole; 7, negative pressure suction hole; 8, dust suction pipe. Specific implementation

[0019] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0020] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0021] In the description of the utility model, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0022] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0023] A cutting device for lithium capacitor or lithium battery pole piece, such as Figure 1 And Figure 2As shown, including the upper cutter 2 and the lower cutter 1, the lower cutter 1 is provided below the lower cutter holder 5, and the negative pressure dust collection mechanism is provided on the lower cutter holder 5 corresponding to the upper cutter 2 and the lower cutter 1. The lower cutter 1 is provided with a receiving groove 4 for accommodating the pole piece, the length of the upper cutter 2 is greater than the width of the receiving groove 4, and the side of the upper cutter 2 facing the lower cutter 1 is provided with a cutting part 3. The cutting part 3 is provided on both sides of the upper cutter 2, and each cutting part 3 is inclined on the upper cutter 2, and the inclined end of each cutting part 3 is arranged towards the middle of the upper cutter 2.

[0024] Specifically, the length direction of the receiving groove 4 is the same as the moving direction of the pole piece, the length direction of the upper cutter 2 is perpendicular to the length direction of the receiving groove 4, the two cutting parts 3 are in inverted V-shaped structure, and the upper cutter 2 can be installed on the lifting device to realize up and down movement to cut the pole piece. In addition, by setting the length of the upper cutter 2 to be greater than the width of the receiving groove 4, it can not only ensure that the upper cutter 2 can cut the pole piece completely, but also help to reduce the probability of burr and burr on the edge of the pole piece.

[0025] This upper cutter 2 adjusts the original cutter from single-side angle oblique cutter to double-side angle flat cutter through the angle of the cutting part 3, so that the stress on the pole piece changes from single-side stress to double-side stress when cutting, so that the stress on both sides of the pole piece is symmetrical and uniform when cutting with this upper cutter 2, and the pole piece has less dropping material and is not easy to produce burr, burr and other defects. At the same time, by setting the negative pressure dust collection mechanism on the lower cutter holder 5, the dust generated during cutting can be sucked away, reducing the amount of dust falling on the pole piece.

[0026] In actual application, the included angle between the cutting part 3 and the lower cutter 1 can be 1°, 1.5°, 2°, etc., which can be adjusted by those skilled in the art according to actual needs. This cutting device combines the advantages of oblique cutter and flat cutter, uses flat cutter, but makes the oblique upper cutter 2 into two-side angle flat cutter, and the stress on both sides of the pole piece is symmetrical and uniform, and the pole piece is more stable and less likely to deviate. In addition, those skilled in the art can also adjust the two-side angle of the upper cutter 2 according to the thickness of the pole piece, the cutting material characteristics, etc., for example, the inclination angle of the cutting part 3 is increased from 1.5° to 2°, and the cutting effect will be better.

[0027] Preferably, the included angle between the cutting part 3 and the lower cutter 1 is 2°. Specifically, for negative cutting dropping, the single-side cutter of the upper cutter 2 is changed to double-side cutter, and the double-side angle is adjusted from 1.5° to 2°, and 1200 meters of negative pole is cut, and the negative pressure dust collection mechanism is used for negative pressure dust collection, and the surface of the pole piece after cutting is free of dust, and no burr and burr are generated during cutting, and the improvement effect is obvious.

[0028] Preferably, the negative pressure dust collection mechanism comprises dust suction holes 6 arranged on the lower cutter holder 5, and the dust suction holes 6 are arranged at least two in the length direction of the upper cutter 2. For example, the dust suction holes 6 can be arranged two, three or more, and the dust suction holes 6 are arranged at intervals, which can meet the needs of negative pressure dust collection while ensuring the structural strength of the lower cutter holder 5, so that the lower cutter holder 5 can stably support and fix the lower cutter 1.

[0029] Preferably, the negative pressure dust collection mechanism further comprises a dust suction pipe 8 arranged below the lower cutter holder 5, and the dust suction pipe 8 is in communication with the dust suction holes 6. For example, the dust suction pipe 8 is detachably mounted on the lower cutter holder 5, so as to facilitate subsequent cleaning and maintenance. For example, the dust suction pipe 8 can be detachably mounted on the lower cutter holder 5 by screws or other conventional methods, and a plurality of dust suction holes 6 can be connected with one dust suction pipe 8 or a plurality of dust suction pipes 8 to improve the dust collection effect. Those skilled in the art can arrange as needed. In addition, a sealing ring or other sealing structure can be arranged between the dust suction pipe 8 and the lower cutter holder 5 to prevent leakage. In actual use, the dust suction pipe 8 can be connected with an external air suction device to generate negative pressure and achieve negative pressure dust collection.

[0030] In actual application, the lower cutter 1 can be mounted and fixed on the lower cutter holder 5 by screws or other conventional methods. During cutting, the existing sensor can be used to sense the position of the pole piece, and when the sensor senses that the pole piece has reached the specified cutting length, the existing PLC can trigger the lifting device to drive the upper cutter 2 to cut. At this time, the lower cutter 1 is stationary, and the upper cutter 2 falls to cut. The negative pressure dust collection mechanism works simultaneously, and the dust suction holes 6 and the dust suction pipe 8 can suck away the dust. Then, the cut pole piece can be sucked away by the negative pressure belt with air holes, and the negative pressure dust collection mechanism stops working. Then, the next pole piece cutting is continued.

[0031] Preferably, a plurality of negative pressure suction holes 7 are arranged at intervals on the lower cutter 1 corresponding to the position of the accommodation groove 4, and each negative pressure suction hole 7 is in communication with the dust suction hole 6 at one end and in communication with the accommodation groove 4 at the other end. For example, the negative pressure suction holes 7 can be arranged two, three or more, and each negative pressure suction hole 7 is in communication with the dust suction pipe 8 through the dust suction hole 6. One dust suction pipe 8 can realize negative pressure dust collection and negative pressure adsorption, which simplifies the structure and is conducive to reducing the manufacturing and maintenance difficulty of the cutting device.

[0032] In actual application, by arranging a plurality of negative pressure suction holes 7, when the negative pressure dust collection mechanism works, the pole piece in the accommodation groove 4 can also generate uniform negative pressure suction force through the negative pressure suction holes 7, which is conducive to further improving the stability of the pole piece during cutting, thereby reducing problems such as burr, edge burr and material falling. By using the accommodation groove 4 and the negative pressure suction hole 7 to jointly limit the pole piece, the pole piece can be effectively prevented from deviating during cutting, which is also conducive to further improving the cutting quality and reducing the pole piece rejection rate, and has important significance for cutting the lithium ion battery pole piece.

[0033] The cutting device for lithium capacitor or lithium battery pole piece can be suitable for cutting of the pole piece, has the advantages of simple structure and good cutting effect, and can reduce the probability of dust falling on the pole piece, which is beneficial to reducing the probability of subsequent battery short circuit and self-discharge abnormality. By setting the accommodating groove on the lower cutter and setting the negative pressure suction hole communicated with the accommodating groove, the negative pressure suction mechanism can not only collect dust, but also realize negative pressure adsorption of the pole piece in the accommodating groove, which is beneficial to improving the stability of the pole piece in the cutting process, so that the two cutting parts on the upper cutter can cut the pole piece with symmetrical and uniform stress on both sides of the pole piece, and the pole piece has less dropping and is not easy to produce burrs, burrs and other adverse problems.

[0034] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A slitting apparatus for lithium capacitor or lithium battery electrode sheets, characterized by: The application relates to a cutting device for cutting a pole piece, which comprises an upper cutting knife (2) and a lower cutting knife (1), wherein a lower knife holder (5) is arranged below the lower cutting knife (1), a negative pressure dust suction mechanism is arranged on the lower knife holder (5) corresponding to the position where the upper cutting knife (2) and the lower cutting knife (1) are in close contact, a containing groove (4) for containing the pole piece is arranged on the lower cutting knife (1), the length of the upper cutting knife (2) is greater than the width of the containing groove (4), a cutting part (3) is arranged on the side of the upper cutting knife (2) facing the lower cutting knife (1), two cutting parts (3) are arranged corresponding to the left and right ends of the upper cutting knife (2), each cutting part (3) is arranged obliquely on the upper cutting knife (2), and the obliquely upward end of each cutting part (3) is arranged towards the middle part of the upper cutting knife (2).

2. The slitting apparatus for lithium capacitor or lithium battery electrode sheets according to claim 1, characterized in that: The negative pressure dust suction mechanism comprises dust suction holes (6) arranged on the lower knife holder (5), and the dust suction holes (6) are arranged at least in two groups in the length direction of the upper cutting knife (2).

3. The slitting apparatus for lithium capacitor or lithium battery electrode sheets according to claim 2, characterized in that: The negative pressure dust suction mechanism further comprises dust suction pipes (8) arranged below the lower knife holder (5), and the dust suction pipes (8) are communicated with the dust suction holes (6).

4. The cutting device for lithium capacitor or lithium battery electrode plate according to claim 3, characterized in that: The dust suction pipes (8) are detachably arranged on the lower knife holder (5).

5. The slitting apparatus for lithium capacitor or lithium battery electrode sheets according to any one of claims 2 to 4, characterized in that: A plurality of negative pressure suction holes (7) are arranged on the lower cutting knife (1) corresponding to the positions of the containing grooves (4), one end of each negative pressure suction hole (7) is communicated with the dust suction holes (6), and the other end is communicated with the containing grooves (4).

6. The slitting apparatus for lithium capacitor or lithium battery electrode sheets according to claim 1, characterized in that: The included angle between the cutting part (3) and the lower cutting knife (1) is 2 degrees.

Images