Mobile scraper for diaphragm coating

Abstract

The utility model relates to the technical field of lithium battery diaphragm coating, in particular to a diaphragm coating moving scraper which comprises a scraper box, a scraper body and a linear motion module, the scraper body is arranged on the side, close to a gravure roller, of the scraper box, and the scraper body abuts against the surface of the gravure roller. The side, away from the gravure roller, of the cutter box is connected with a sliding block of the linear motion module, the linear motion module and the gravure roller are oppositely arranged, and the linear motion module drives the cutter box to move in a reciprocating mode relative to the axial direction of the gravure roller. The linear motion module drives the cutter box to reciprocate relative to the axial direction of the gravure roller, so that long-term fixed contact abrasion of one position of the scraper and the same position of the gravure roller is avoided, the abrasion degrees of all points of the scraper are kept relatively consistent, the coating weight range is reduced, the uniformity of the thickness of a finished diaphragm is prevented from being influenced, and the coating quality is improved. The safety of the battery is improved, the replacement frequency of the scraper can be reduced, and the production cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery separator coating technology, and in particular to a separator coating movable scraper. Background Technology

[0002] With the continuous development of society and the continuous improvement of scientific level, the rapid development of the lithium battery industry in recent years has driven the corresponding development of coated separators. The so-called coated separator is to coat a heat-resistant layer or adhesive layer on the base film used in lithium batteries, so as to improve the heat resistance of the separator and the adhesion between the separator and the positive and negative electrodes. There are many separator coating processes, such as dip coating, scraping coating, narrow slit extrusion and gravure roller coating, etc. Gravure roller coating is currently the most widely used technology. In gravure roller coating, the gravure roller carries the slurry out of the slurry box, the excess coating is scraped off by the thickness-fixed doctor blade, and then coated onto the separator.

[0003] Currently, upper and lower doctor blades are used to scrape off excess coating on the gravure roller to obtain a coated separator. However, the lateral positions of the upper and lower doctor blades and the gravure roller remain relatively constant. When scraping the gravure roller, the wear of different points on the upper and lower doctor blades and the gravure roller is inconsistent to a certain extent, resulting in severe wear in some areas. This ultimately affects the uniformity of the thickness of the finished separator, and the large difference in coating weight leads to crystallization and puncture on the separator, posing a great threat to the safety of the subsequent battery. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The purpose of this invention is to solve the problem that the wear of different points on the upper and lower scrapers and the gravure roller is inconsistent to a certain extent, resulting in severe wear in some areas.

[0006] (II) Technical Solution

[0007] To solve the above-mentioned technical problems, this utility model provides a diaphragm coating moving scraper, including a scraper box, a scraper, and a linear motion module. The scraper is disposed on the side of the scraper box near the gravure roller, and the scraper abuts against the surface of the gravure roller. The side of the scraper box away from the gravure roller is connected to the slider of the linear motion module. The linear motion module is disposed opposite to the gravure roller, and the linear motion module drives the scraper box to reciprocate in the axial direction relative to the gravure roller.

[0008] Furthermore, the doctor blade is inclined toward the center of the gravure roller.

[0009] Furthermore, the scraper is movably connected to the blade box, and the direction of movement of the scraper is consistent with the direction of tilting.

[0010] Furthermore, the blade box is provided with a receiving cavity that accommodates and provides movement space for the scraper, the scraper is movably disposed in the receiving cavity, and a spring is provided between the scraper and the bottom of the receiving cavity.

[0011] Furthermore, a through groove is provided on one side of the receiving cavity, through which a screw passes and connects to the scraper.

[0012] Furthermore, the scraper includes an upper scraper and a lower scraper, the upper scraper is disposed at the upper end of the scraper box, and the lower scraper is disposed at the lower end of the scraper box, and the blades of both the upper and lower scrapers abut against the gravure roller.

[0013] Furthermore, the linear motion module adopts a linear motor module, which drives the slider to reciprocate along a linear direction by rotating the motor in both forward and reverse directions.

[0014] Furthermore, limit switches are provided at both ends of the linear motion module, and the limit switches are electrically connected to the controller of the linear motion module.

[0015] (III) Beneficial Effects

[0016] The above-mentioned technical solution of this utility model has the following advantages: Since the linear motion module drives the blade box to move back and forth in the axial direction relative to the gravure roller, it avoids long-term fixed contact and wear between the blade and the gravure roller at the same position, thereby ensuring that the wear degree of each point of the blade remains relatively consistent, reducing the coating weight difference, avoiding affecting the uniformity of the thickness of the finished separator, improving the safety of the battery, and at the same time reducing the frequency of blade replacement and saving production costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a diaphragm coating movable scraper according to this utility model;

[0018] Figure 2 This is a perspective view of a diaphragm coating movable scraper according to the present invention;

[0019] In the diagram: 1. Knife box; 2. Scraper; 3. Linear motion module; 4. Gravure roller; 5. Spring; 6. Through slot; 7. Screw. Detailed Implementation

[0020] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Please refer to Figure 1 and Figure 2 This invention provides a movable scraper for diaphragm coating, comprising a scraper box 1, a scraper 2, and a linear motion module 3. The scraper 2 is disposed on the side of the scraper box 1 near the gravure roller 4, and the scraper 2 abuts against the surface of the gravure roller 4. The side of the scraper box 1 away from the gravure roller 4 is connected to the slider of the linear motion module 3. The linear motion module 3 is disposed opposite to the gravure roller 4, and the linear motion module 3 drives the scraper box 1 to reciprocate in the axial direction relative to the gravure roller 4. In use, the scraper 2 scrapes off excess coating on the gravure roller 4 to obtain a coated diaphragm. At the same time, the linear motion module 3 drives the scraper box 1 to reciprocate in the axial direction relative to the gravure roller 4, avoiding long-term fixed contact and wear of the scraper 2 at the same position on the gravure roller 4. This ensures that the wear degree of the scraper 2 remains relatively consistent at all points, reduces coating weight variation, avoids affecting the uniformity of the finished diaphragm thickness, improves battery safety, and also reduces the frequency of scraper 2 replacement, saving production costs. It should be noted that the two extreme positions of the reciprocating motion of the knife box 1 will not exceed the width of the diaphragm acting on the gravure roller 4.

[0024] In some embodiments, the doctor blade 2 is inclined toward the center of the gravure roller 4. Further, the doctor blade 2 is movably connected to the blade holder 1, and the direction of movement of the doctor blade 2 is consistent with the inclination direction. The movable connection between the doctor blade 2 and the blade holder 1 can be achieved using a cylinder, hydraulic cylinder, etc. For example, the cylinder body is connected to the blade holder 1, and the cylinder rod is connected to the doctor blade 2, allowing the doctor blade 2 to be adjusted in position relative to the blade holder 1 to adapt to the surface of the gravure roller 4.

[0025] In some embodiments, the blade holder 1 is provided with a receiving cavity that accommodates and provides movement space for the scraper 2. The scraper 2 is movably disposed within the receiving cavity, and a spring 5 is provided between the scraper 2 and the bottom of the receiving cavity. Further, a through groove 6 is provided on one side of the receiving cavity, and a screw 7 passes through the through groove 6 and connects to the scraper 2. In use, due to the restoring effect of the spring 5, the scraper 2 can also be adjusted relative to the blade holder 1 to adapt to the surface of the gravure roller 4. Simultaneously, the screw 7 restricts the scraper 2 to move only in an inclined direction and has a certain stroke, preventing the scraper 2 from falling or wobbling.

[0026] In some embodiments, the scraper 2 includes an upper scraper and a lower scraper. The upper scraper is disposed at the upper end of the scraper box 1, and the lower scraper is disposed at the lower end of the scraper box 1. The blades of both the upper and lower scrapers abut against the gravure roller 4 to form a closed structure.

[0027] In some embodiments, the linear motion module 3 employs a linear motor module, which drives the slider to reciprocate along a linear direction by rotating the motor in both forward and reverse directions. Specifically, the motor drives a lead screw, which in turn moves the slider on a slide rail. Since linear motor modules are existing technology, they will not be described in detail here. Furthermore, the linear motion module 3 also includes pneumatic and hydraulic types, all of which should be included within the scope of this application.

[0028] In some embodiments, limit switches are provided at both ends of the linear motion module 3, and the limit switches are electrically connected to the controller of the linear motion module 3. The limit switches are respectively set at the two extreme positions of the reciprocating stroke of the cutter box 1. The two extreme positions will not exceed the width of the gravure roller 4 acting on the diaphragm. When the cutter box 1 contacts one of the limit switches, the limit switch will transmit an electrical signal to the controller, causing the controller to control the motor to change direction, ensuring the reciprocating motion of the cutter box 1 and evenly applying the coating to the gravure roller 4, which then transfers the coating to the diaphragm.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A diaphragm coating movable scraper, characterized in that: The device includes a knife box, a scraper, and a linear motion module. The scraper is located on the side of the knife box near the gravure roller and abuts against the surface of the gravure roller. The side of the knife box away from the gravure roller is connected to a slider of the linear motion module. The linear motion module is disposed opposite to the gravure roller and drives the knife box to reciprocate in the axial direction relative to the gravure roller.

2. The diaphragm coating moving scraper according to claim 1, characterized in that: The scraper is inclined toward the center of the gravure roller.

3. The diaphragm coating moving scraper according to claim 2, characterized in that: The scraper is movably connected to the scraper box, and the direction of movement of the scraper is consistent with the direction of tilting.

4. The diaphragm coating moving scraper according to claim 3, characterized in that: The blade box is provided with a receiving cavity that accommodates and provides space for the scraper to move. The scraper is movably disposed in the receiving cavity, and a spring is provided between the scraper and the bottom of the receiving cavity.

5. The diaphragm coating movable scraper according to claim 4, characterized in that: A through groove is provided on one side of the receiving cavity, and a screw passes through the through groove to connect with the scraper.

6. The diaphragm coating movable scraper according to claim 5, characterized in that: The scraper includes an upper scraper and a lower scraper. The upper scraper is disposed at the upper end of the scraper box, and the lower scraper is disposed at the lower end of the scraper box. The blades of both the upper and lower scrapers abut against the gravure roller.

7. The diaphragm coating moving scraper according to claim 1, characterized in that: The linear motion module uses a linear motor module, which drives the slider to reciprocate along a linear direction by rotating the motor in both forward and reverse directions.

8. The diaphragm coating moving scraper according to claim 7, characterized in that: Limit switches are provided at both ends of the linear motion module, and the limit switches are electrically connected to the controller of the linear motion module.

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