Pole piece dust removal device and cutting equipment

Abstract

The utility model relates to the technical field of battery production, in particular to a pole piece dust removal device and cutting equipment, the pole piece dust removal device comprises a first conveying assembly, a compression roller and a rear dust removal assembly, the first conveying assembly is used for conveying pole pieces, the compression roller can rotate around the axis of the compression roller, and the outer roller surface of the compression roller keeps dynamic rolling pressure contact with the surfaces of the pole pieces; and foreign matters attached to the surfaces of the pole pieces are crushed in the pole piece conveying process. And the rear dust removal assembly can remove crushed foreign matters on the surface of the pole piece. By arranging the compression roller, foreign matters adhered to the surfaces of the pole pieces can be pulverized into powder or thinned into fragments in the pole piece conveying process, so that the adhesiveness of the foreign matters is reduced, the foreign matters are separated from the surfaces of the pole pieces more easily, a rear dust removal assembly can remove the light-weight and light-density foreign matters from the surfaces of the pole pieces more efficiently, and effective dust removal is achieved; the pole group short-circuit rate is reduced, the self-discharge problem of the battery core is improved, and the production cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a pole piece dust removal device and cutting equipment. Background Art

[0002] At present, with the rapid development of the power battery industry, various competitions among battery companies will become more and more fierce. Major lithium battery manufacturers will improve the quality of battery cell products, expand production line capacity and improve production line automation as the company's strategic goal. The quality of key equipment for lithium battery production is an important guarantee for the capacity and quality of battery cell products. Efficient and low-cost pole piece cutting and dust removal devices have become one of the important factors in improving equipment capacity and improving pole group quality.

[0003] At present, battery cell manufacturers generally use metal mold punching to cut pole pieces. This method is more likely to produce burrs, which can easily pierce the diaphragm during the hot pressing process of lamination, causing thermal runaway of the battery cell. At the same time, after long-term work, metal mold punching will cause tool wear and material sticking to the knife, causing process instability, resulting in poor quality of pole piece cutting, and ultimately leading to a decrease in battery yield and even safety hazards. However, as a new pole piece cutting method, laser has the characteristics of no burrs, high yield, high quality consistency, and low maintenance cost, and is regarded as the best solution for pole piece cutting. However, the laser pole piece cutting equipment designed in the laboratory verification stage currently has the following problems: dust and large particles are easy to fall on the pole piece surface during pole piece cutting, the air knife dust removal effect is not good, and the metal spatter generated during laser cutting adheres to the pole piece surface, which is difficult to remove with the existing dust removal solution. As a result, there are many foreign objects on the pole piece surface, the Hi-pot short circuit rate of the battery cell is high and the self-discharge is serious, the production cost is high, and the safety of the battery cell is affected. Utility Model Content

[0004] The purpose of the utility model is to provide a pole piece dust removal device and cutting equipment to solve the problem in the prior art that dust and large flying particles in the cutting process are very easy to fall on the pole piece surface and are not easy to remove, thus resulting in a high short circuit rate and serious self-discharge of the battery cell.

[0005] In order to solve the above problems, the utility model relates to a pole piece dust removal device, comprising:

[0006] A first conveying assembly, used for conveying pole pieces;

[0007] The pressure roller is located above the first conveying assembly and can rotate around its own axis. The outer roller surface maintains dynamic rolling and pressing contact with the surface of the pole piece to crush foreign matter attached to the surface of the pole piece during the transmission of the pole piece.

[0008] The post-dust removal component is located at the subsequent station of the pressure roller and can remove the crushed foreign matter on the surface of the pole piece.

[0009] In some specific embodiments, it also includes:

[0010] The rolling platform is arranged below the pressing roller, and can support the pole piece on the first conveying assembly to prevent the pole piece from moving downward when the pressing roller is rolling the pole piece.

[0011] In some specific embodiments, it also includes:

[0012] The end of the separation scraper contacts the outer roller surface of the pressure roller and can scrape off foreign matter adhering to the outer roller surface of the pressure roller.

[0013] In some specific embodiments, the post-dust removal component includes:

[0014] The first dust collector is located above the first conveying assembly and faces the rolled side of the pole piece, and can remove foreign matter on the upper surface of the pole piece;

[0015] The second conveying assembly is arranged at the end of the first conveying assembly and can adsorb the electrode sheet on the first conveying assembly to the bottom of the second conveying assembly;

[0016] The second dust collector is located below the second conveying assembly and faces the other side of the pole piece, and can remove foreign matter on the lower surface of the pole piece.

[0017] In some specific embodiments, the first dust collector and the second dust collector are ultrasonic dust collectors.

[0018] In some specific embodiments,

[0019] The first conveying assembly includes,

[0020] The first transmission wheels are two, one is a driving wheel and the other is a driven wheel;

[0021] A first conveyor belt is sleeved on the two first conveying wheels, and the pole piece is placed on the first conveyor belt;

[0022] And / or, the second conveying assembly includes,

[0023] The second transmission wheels are two, one is a driving wheel and the other is a driven wheel;

[0024] The second conveyor belt is a vacuum adsorption belt, which is sleeved on the two second transmission wheels, and the pole piece is adsorbed under the second conveyor belt.

[0025] In some specific embodiments, a front dust removal component is also included, and the front dust removal component includes:

[0026] Air knife, with the blade facing the cutting station of the pole piece;

[0027] The dust removal hood is located near the cutting station of the pole piece and is arranged opposite to the wind knife.

[0028] A pole piece cutting device based on the same inventive concept includes the pole piece dust removal device provided by any of the above-mentioned specific embodiments, and also includes a cutting component, wherein the front dust removal component is arranged close to the cutting component, and the pressure roller and the rear dust removal component are arranged in sequence at the subsequent workstations of the cutting component.

[0029] In some specific embodiments, the cutting component includes:

[0030] A laser is disposed above the pole piece;

[0031] The pole piece processing tool is arranged below the pole piece and opposite to the laser, and the preset optical path of the laser is consistent with the shape of the pole piece processing tool.

[0032] In some specific embodiments, it also includes:

[0033] An unwinding shaft, on which the uncut pole piece is wound.

[0034] The beneficial effects of the utility model are as follows:

[0035] 1. The pole piece dust removal device of the utility model is provided with a pressure roller, which rotates around its own axis. The outer roller surface of the pressure roller maintains dynamic rolling pressure contact with the surface of the pole piece, so that the pressure roller can crush the foreign matter (hard metal particles and dust formed in the cutting process) adhering to the surface of the pole piece into powder or thin it into fragments during the transmission of the pole piece, thereby reducing the adhesion of the foreign matter, making it easier to separate the foreign matter from the surface of the pole piece, which is conducive to the subsequent dust removal mechanism to more efficiently remove light and light-density foreign matter from the surface of the pole piece.

[0036] 2. The pole piece dust removal device of the utility model sets a post-dust removal component at the subsequent station of the pressure roller, and removes foreign matter on the upper surface of the pole piece (the rolled side) through the first dust collector, and removes foreign matter on the lower surface of the pole piece through the second dust collector, thereby ensuring that the upper and lower surfaces of the pole piece are clean and dust-free.

[0037] 3. The pole piece dust removal device of the utility model sets a front dust removal component at the front station of the pressure roller. The front dust removal component is close to the cutting station of the pole piece, which can remove the dust and small metal particles generated during the cutting process in time, prevent the dust from flying, and reduce the amount of foreign matter attached to the surface of the pole piece. At the same time, the front dust removal component cooperates with the pressure roller and the rear dust removal component in three dust removal modes. The front dust removal component removes very small particles and smoke, and the pressure roller and the rear dust removal component remove metal foreign matter with strong surface adhesion or foreign matter with static electricity and residual dust, thereby achieving effective cleaning of the pole piece, reducing the short circuit rate of the pole group, and improving the self-discharge problem of the battery cell.

[0038] 4. The pole piece cutting equipment of the utility model combines laser cutting of pole pieces with three dust removal methods: front dust removal component, pressure roller, and rear dust removal component, which optimizes the equipment space and can effectively remove foreign dust attached to the surface of the pole piece during the cutting process, thereby reducing the short circuit rate of the pole group and reducing equipment and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0041] Explanation of the reference numerals in the figure: 100 - first conveying assembly, 110 - first transmission wheel, 120 - first conveyor belt, 200 - pressure roller, 300 - rear dust removal assembly, 310 - first dust collector, 320 - second dust collector, 330 - second conveying assembly, 331 - second transmission wheel, 332 - second conveyor belt, 400 - rolling platform, 500 - separation scraper, 600 - front dust removal assembly, 610 - wind knife, 620 - dust removal hood, 700 - cutting assembly, 710 - laser, 720 - pole piece processing tool, 800 - unwinding shaft, 900 - pole piece. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0043] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0044] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "axis", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] 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.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "join", "hinge" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] As the background technology, the current laser cutting pole piece equipment has the following problems: dust and large particles are easy to fall on the pole piece surface during pole piece cutting, the air knife dust removal effect is poor, and the metal splashes generated during laser cutting adhere to the pole piece surface, which is difficult to remove with the existing dust removal scheme. This results in a lot of foreign matter on the pole piece surface, a high pole group short circuit rate and serious self-discharge, and high production costs.

[0048] In order to improve the above problems, this embodiment provides a dust removal device for a pole piece, such as Figure 1 As shown, it includes a first conveying assembly 100, a pressure roller 200 and a post-dust removal assembly 300, wherein the first conveying assembly 100 is used to convey the pole piece 900, and the first conveying assembly is any single-line transmission method in the prior art. The roller shaft of the pressure roller 200 is connected to the driving motor in a transmission manner and can rotate around its own axis. The pressure roller 200 is located above the first conveying assembly 100, and the outer roller surface of the pressure roller 200 maintains dynamic rolling pressure contact with the surface of the pole piece 900, so that during the transmission of the pole piece, the rotating pressure roller will crush the foreign matter attached to the surface of the pole piece. The post-dust removal assembly 300 is arranged at the subsequent station of the pressure roller 200, and the post-dust removal assembly 300 can remove the crushed foreign matter on the surface of the pole piece, and the post-dust removal assembly 300 can adopt any surface dust removal method in the prior art.

[0049] By setting the pressure roller 200, foreign matter adhering to the surface of the pole piece (hard metal particles and dust formed during the cutting process) can be crushed into powder or thinned into fragments during the transmission of the pole piece, thereby reducing the adhesion between the foreign matter and the pole piece, separating the foreign matter from the surface of the pole piece, and facilitating the post-dust removal component 300 to more efficiently remove light and low-density powdery or flaky foreign matter from the surface of the pole piece.

[0050] Specifically, in the exemplary embodiment, a rolling platform 400 is further included. The rolling platform 400 is arranged below the pressure roller 200 and opposite to the pressure roller. The working surface of the rolling platform 400 is a flat table with a certain supporting hardness, which can support the pole piece 900 on the first conveying assembly 100, and prevent the pole piece from moving down during the rolling of the pole piece by the pressure roller. It is ensured that the pressure roller 200 and the pole piece maintain a stable and appropriate rolling force during the rolling contact process, which is sufficient to crush foreign matter on the pole piece.

[0051] Specifically, in the exemplary embodiment, a separation scraper 500 is also included, and the end of the separation scraper is kept in contact or pressure contact with the outer roller surface of the pressure roller 200. By adjusting the angle between the separation scraper 500 and the pressure roller 200, the separation scraper can smoothly scrape off foreign matter on the outer roller surface of the pressure roller.

[0052] Since dust on the surface of the pole piece may adhere to the surface of the pressure roller 200 during rolling, foreign dust will adhere to the outer roller surface of the pressure roller after rolling the pole piece. As the pressure roller 200 continues to rotate, the pressure roller reaches the position of the separation scraper 500, and the separation scraper 500 scrapes off the foreign matter adhered to the outer roller surface of the pressure roller. After scraping and cleaning by the separation scraper, the outer roller surface of the pressure roller 200 remains clean again, thereby preventing the introduction of foreign matter.

[0053] Specifically, in the exemplary embodiment, the post-dust removal assembly 300 includes a first dust collector 310, a second conveying assembly 330 and a second dust collector 320, wherein the first dust collector 310 is located above the first conveying assembly 100 and faces the rolled side of the pole piece 200, and the first dust collector 310 can remove foreign matter on the upper surface of the pole piece. The second conveying assembly 330 is disposed at the end of the first conveying assembly 100, and can adsorb the pole piece on the first conveying assembly 100 to the bottom of the second conveying assembly 330. The second conveying assembly is any inverted transmission structure in the prior art. The second dust collector 320 is located below the second conveying assembly 330 and faces the other side of the pole piece, and the second dust collector 320 can remove foreign matter on the lower surface of the pole piece. The first dust collector and the second dust collector are any surface dust removal structures in the prior art.

[0054] By setting up the first dust collector 310, foreign matter on the upper surface of the pole piece (the rolled side) can be removed, and by setting up the second dust collector 320, foreign matter on the lower surface of the pole piece can be removed, thereby ensuring that the upper and lower surfaces of the pole piece are clean and dust-free, reducing the short circuit rate of the pole group and improving the self-discharge problem of the battery cell.

[0055] Specifically, in the exemplary embodiment, the first dust collector 310 and the second dust collector 320 are ultrasonic dust collectors. The ultrasonic dust collector mainly uses the principle of ultrasonic vibration to achieve dust removal. The ultrasonic generator generates a high-frequency electrical signal, which is converted into mechanical vibration through the ultrasonic transducer, and then the vibration is transmitted to the surface of the dust object through the reflector, thereby achieving the purpose of dust removal. Through the combination of ultrasonic waves and negative pressure, the floating sediment and particles on the surface of the electrode are further removed.

[0056] Specifically, in the exemplary embodiment, the first conveying assembly 100 includes a first conveying wheel 110 and a first conveying belt 120. The first conveying wheels 110 are two, one is a driving wheel and the other is a driven wheel. The first conveying belt 120 is sleeved on the two first conveying wheels 110, and the pole piece 900 is placed on the first conveying belt 120.

[0057] The second conveying assembly 330 includes a second conveying wheel 331 and a second conveying belt 332. There are two second conveying wheels 331, one is a driving wheel and the other is a driven wheel. The second conveying belt 332 is sleeved on the two second conveying wheels 331. The second conveying belt is any negative pressure vacuum adsorption belt in the prior art. The pole piece 900 is adsorbed under the second conveying belt 332 by negative pressure.

[0058] The pressure roller 200 is located at the upper end of the first conveyor belt 120, and the second conveyor belt 332 is located at the end of the first conveyor belt 120. After the pole piece is rolled by the pressure roller 200 and dusted by the first dust collector 310, it is adsorbed by the second conveyor belt 332 and hung upside down under the second conveyor belt 332, and dusted by the second dust collector 320.

[0059] Specifically, in the exemplary embodiment, a front dust removal component 600 is also included. The front dust removal component 600 is close to the cutting station of the pole piece. The front dust removal component includes a wind knife 610 and a dust cover 620, wherein the blade of the wind knife 610 faces the cutting station of the pole piece, and the wind knife is used to blow away the dust and foreign matter on the surface of the pole piece. The dust cover 620 is close to the cutting station of the pole piece and is arranged opposite to the wind knife 610. Under the action of negative pressure, the dust cover 620 collects the smoke and fine particles in the air and on the surface of the pole piece generated during the cutting process to prevent dust from flying and reduce the amount of foreign matter attached to the surface of the pole piece. At the same time, the front dust removal component 600 cooperates with the three dust removal methods of the pressure roller 200 and the rear dust removal component 300 to effectively remove dust, reduce the short circuit rate of the pole group, and improve the battery yield rate.

[0060] A pole piece dust removal device also includes a cutting assembly 700, a front dust removal assembly 600 is arranged near the cutting assembly 700, and a pressure roller 200 and a rear dust removal assembly 300 are sequentially arranged at subsequent stations of the cutting assembly 700. By combining laser cutting of pole pieces with three dust removal methods, namely, the front dust removal assembly 600, the pressure roller 200, and the rear dust removal assembly 300, the equipment space can be optimized, foreign dust attached to the pole piece surface during the cutting process can be effectively removed, the pole group short circuit rate can be reduced, and the equipment and production costs can be reduced.

[0061] Specifically, in the exemplary embodiment, the cutting assembly 700 includes a laser 710 and a pole piece processing tool 720, wherein the laser 710 is disposed above the pole piece. The pole piece processing tool 720 is disposed below the pole piece and is disposed opposite to the laser 710, and the preset optical path of the laser 710 is consistent with the shape of the pole piece processing tool 720. The laser 710 is combined with the high-speed movement of the galvanometer and the customized pole piece processing tool 720 to instantly realize the integrated forming of the pole ear and the material area.

[0062] Specifically, in the exemplary embodiment, a reel 800 is further included, and the uncut pole piece is wound on the reel 800 , which cooperates with the first conveyor belt 120 to transport the pole piece 900 to the subsequent workstation.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", "a specific embodiment" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0064] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the present invention based on the technical solution and the concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dust removal device for a pole piece, characterized in that: include: A first conveying assembly, used for conveying the pole piece; A pressure roller, located above the first conveying assembly, can rotate around its own axis, and the outer roller surface maintains dynamic rolling and pressing contact with the surface of the pole piece, so as to crush foreign matter attached to the surface of the pole piece during the transmission of the pole piece; The post-dust removal component is located at the subsequent station of the pressing roller and can remove the crushed foreign matter on the surface of the pole piece.

2. The pole piece dust removal device according to claim 1, characterized in that: Also includes: The rolling platform is arranged below the pressing roller, and can support the pole piece on the first conveying assembly, and prevent the pole piece from moving downward when the pressing roller is rolling the pole piece.

3. The pole piece dust removal device according to claim 1, characterized in that: Also includes: The end of the separation scraper contacts the outer roller surface of the pressing roller and can scrape off foreign matter adhered to the outer roller surface of the pressing roller.

4. The pole piece dust removal device according to claim 1, characterized in that: The post-dust removal component comprises: A first dust collector is located above the first conveying assembly and faces the rolled side of the pole piece, and can remove foreign matter on the upper surface of the pole piece; A second conveying assembly is disposed at the end of the first conveying assembly and can adsorb the pole piece on the first conveying assembly to the bottom of the second conveying assembly; The second dust collector is located below the second conveying assembly and faces the other side of the pole piece, and can remove foreign matter on the lower surface of the pole piece.

5. The pole piece dust removal device according to claim 4, characterized in that: The first dust collector and the second dust collector are ultrasonic dust collectors.

6. The pole piece dust removal device according to claim 4, characterized in that: The first conveying assembly comprises: The first transmission wheels are two, one is a driving wheel and the other is a driven wheel; A first conveyor belt, sleeved on the two first conveying wheels, and the pole piece is placed on the first conveyor belt; And / or, the second conveying assembly comprises: The second transmission wheels are two, one is a driving wheel and the other is a driven wheel; The second conveyor belt is a vacuum adsorption belt, which is sleeved on the two second conveying wheels, and the pole piece is adsorbed under the second conveyor belt.

7. The pole piece dust removal device according to claim 1, characterized in that: It also includes a front dust removal component, which includes: An air knife, with the blade facing the cutting station of the pole piece; A dust removal cover is located close to the cutting station of the pole piece and is arranged opposite to the wind knife.

8. A pole piece cutting device, characterized in that: It comprises the pole piece dust removal device as described in any one of claims 1 to 7, and also comprises a cutting assembly, wherein the front dust removal assembly is arranged close to the cutting assembly, and the pressure roller and the rear dust removal assembly are arranged in sequence at subsequent stations of the cutting assembly.

9. The pole piece cutting device according to claim 8, characterized in that: The cutting component comprises: A laser is disposed above the pole piece; The pole piece processing tool is arranged below the pole piece and opposite to the laser, and the preset optical path of the laser is consistent with the shape of the pole piece processing tool.

10. The pole piece cutting device according to claim 8, characterized in that: Also includes, An unwinding shaft, on which the uncut pole piece is wound.

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