Positive plate slurry pulling equipment

Abstract

The invention discloses slurry pulling equipment for a positive plate, and aims to scrape slurry on an adhesive tape, avoid dropping of material residues during subsequent adhesive tape tearing and reduce waste of the slurry, and the technical scheme is that the slurry pulling equipment for the positive plate comprises a rack, a slurry tank, a first scraping device and a second scraping device, the slurry tank, the first scraping device and the second scraping device are sequentially arranged on the rack from top to bottom, and a foamed nickel base band sequentially passes through the first scraping device and the second scraping device after being output from the slurry tank; the first scraping device is used for scraping the slurry on the adhesive tape, and the second scraping device is used for scraping the slurry on the foamed nickel base tape to a preset thickness.

Description

Technical Field

[0001] The present invention belongs to the technical field of positive electrode sheet processing, and more specifically, relates to a positive electrode sheet slurry drawing device. Background Art

[0002] At present, the preparation of positive electrodes of nickel-hydrogen batteries mostly adopts the slurry drawing method, the principle of which is to prepare the active material additives into slurry, embed the active material on the foam nickel-based tape by slurry drawing, and then cut it into electrodes by roller pressing; the most common slurry drawing method is scraping slurry drawing, which allows the foam nickel-based tape to pass through the slurry groove so that the slurry can adhere to the foam nickel-based tape, and then use a scraper to scrape off the excess slurry, and then roll it up after drying.

[0003] In practice, adhesive tape is adhered to the edges of both sides of the foam nickel-based tape along its length. After the slurry drawing and drying are completed, the tape is torn off, so that clean white edges will appear on both sides of the foam nickel-based tape, and there is no slurry at the white edges, which is convenient for welding the steel strip pole ears; however, during the slurry drawing process, the slurry will also adhere to the tape, and the existing slurry drawing equipment does not have a scraper for the tape. When the tape is subsequently torn off, the material residue adhered to the tape is easy to fall onto the foam nickel-based tape, affecting the quality of the pole piece preparation. Moreover, during mass production, this part of the slurry adhered to the tape also causes waste. Summary of the invention

[0004] The main purpose of the present invention is to provide a positive electrode sheet slurry drawing device, which is designed to scrape off the slurry on the tape to avoid the falling of material residues when the tape is subsequently torn off, while reducing the waste of slurry.

[0005] According to a first aspect of the present invention, a positive electrode sheet slurry drawing device is provided, comprising a frame, a slurry tank, a first scraper device and a second scraper device, wherein the slurry tank, the first scraper device and the second scraper device are arranged on the frame from top to bottom in sequence, and the foamed nickel-based tape passes through the first scraper device and the second scraper device in sequence after being output from the slurry tank; the first scraper device scrapes off the slurry on the tape, and the second scraper device scrapes the slurry on the foamed nickel-based tape to a preset thickness.

[0006] In the above-mentioned positive electrode sheet drawing equipment, the first scraper device includes a mounting plate arranged on the frame and two tape scraper assemblies arranged on the mounting plate, and the two tape scraper assemblies are arranged at intervals along the width direction of the foam nickel base tape and correspond to the tapes on the edges of both sides of the foam nickel base tape.

[0007] In the above-mentioned positive electrode sheet drawing equipment, the tape scraper assembly includes a tool holder and two tape scrapers arranged on the tool holder. The foam nickel-based tape passes between the two tape scrapers, and the tape scrapers adhere to the tape on the foam nickel-based tape.

[0008] In the above-mentioned positive electrode sheet drawing equipment, the tape scraper can elastically expand and contract along the thickness direction of the foam nickel-based tape.

[0009] In the above-mentioned positive electrode sheet drawing equipment, a guide column extending along the thickness direction of the foam nickel-based tape is fixed to the end of the tape scraper away from the tape, and the guide column is slidably matched with the tool holder. A spring is sleeved on the guide column, and the spring is located between the tool holder and the tape scraper.

[0010] In the above-mentioned positive electrode sheet drawing equipment, the position of the knife holder can be adjusted along the width direction of the foam nickel-based tape to adjust the distance between the two tape scraper assemblies.

[0011] In the above-mentioned positive electrode sheet slurry drawing equipment, it also includes a deviation correction sensor located above the first scraping device, and the deviation correction sensor can detect the distance between the deviation correction sensor and the side of the foam nickel base belt to determine the position of the foam nickel base belt;

[0012] The frame is provided with a driving device for driving the mounting plate to move along the width direction of the nickel foam base tape. The driving device operates according to the signal of the deviation correction sensor to adjust the position of the tape scraper assembly so that the tape scraper assembly is aligned with the tape.

[0013] In the above-mentioned positive electrode sheet slurry drawing equipment, the second scraper device includes two thickness-setting scraper assemblies arranged on the frame, and the thickness-setting scraper assemblies include thickness-setting scrapers and an adjustment mechanism. The adjustment mechanism can adjust the position of the thickness-setting scraper along the thickness direction of the foam nickel-based strip. The foam nickel-based strip passes between the two thickness-setting scrapers, and the width of the thickness-setting scraper is greater than the width of the foam nickel-based strip.

[0014] In the above-mentioned positive electrode sheet drawing equipment, the adjustment mechanism includes at least two screws arranged at intervals along the width direction of the foam nickel-based strip, the screws are rotatably set on the frame, the axial direction of the screws is parallel to the thickness direction of the foam nickel-based strip, and the screws are rotated to drive the thickness scraper to move.

[0015] In the above-mentioned positive electrode sheet drawing equipment, the adjustment mechanism includes a cylinder, which is located between two of the screws. The extension and retraction direction of the piston rod of the cylinder is parallel to the axial direction of the screw, and the piston rod of the cylinder is hinged to the thickness scraper.

[0016] One of the above technical solutions of the present invention has at least one of the following advantages or beneficial effects:

[0017] In the present invention, the slurry tank, the first scraper device and the second scraper device are arranged in sequence from top to bottom. The first scraper device can scrape the tape on the foam nickel-based tape to scrape the slurry from the tape, and the scraped slurry returns to the slurry tank. The second scraper device scrapes the slurry on the foam nickel-based tape to a preset thickness, and the scraped slurry can also be returned to the slurry tank. After subsequent drying, when the tape is torn off, the situation where the residue falls onto the foam nickel-based tape is greatly reduced, and the waste of slurry is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0019] Figure 1 is a schematic structural diagram of a first embodiment of the present invention;

[0020] Figure 2 is a schematic structural diagram of a first scraper device according to a first embodiment of the present invention;

[0021] Figure 3 The first embodiment of the present invention Figure 2 A partial enlarged view of A;

[0022] Figure 4 is a schematic structural diagram of a second scraper device according to a first embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of the tape scraper assembly and the foam nickel base tape of the first embodiment of the present invention.

[0024] Among them, the reference numerals of the figures are:

[0025] 1. Frame; 2. Slurry tank; 21. First slurry coating roller; 22. Second slurry coating roller; 23. Feeding roller; 3. First scraper device; 31. Mounting plate; 32. Tape scraper assembly; 321. Knife holder; 322. Tape scraper; 323. Guide column; 324. Spring; 4. Second scraper device; 41. Thickness scraper; 42. Adjustment mechanism; 421. Screw; 422. Cylinder; 423. Micrometer; 5. Correction sensor; 6. Driving device. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0028] Reference Figures 1 to 5 As shown, a positive electrode sheet slurry drawing device includes a frame 1, a slurry tank 2, a first scraper device 3 and a second scraper device 4. The slurry tank 2, the first scraper device 3 and the second scraper device 4 are arranged on the frame 1 from top to bottom. After the foam nickel-based tape is output from the slurry tank 2, it passes through the first scraper device 3 and the second scraper device 4 in sequence; the first scraper device 3 scrapes off the slurry on the tape, and the second scraper device 4 scrapes the slurry on the foam nickel-based tape to a preset thickness. The scraped slurry can also be returned to the slurry tank 2. After subsequent drying, when the tape is torn off, the situation where the slag falls onto the foam nickel-based tape is greatly reduced, and the waste of slurry is reduced.

[0029] Specifically, the first scraper device 3 includes a mounting plate 31 disposed on the frame 1 and two tape scraper assemblies 32 disposed on the mounting plate 31, the two tape scraper assemblies 32 are arranged at intervals along the width direction of the foam nickel-based strip and correspond to the tapes at the edges of both sides of the foam nickel-based strip;

[0030] The tape scraper assembly 32 includes a knife frame 321 and two tape scrapers 322 arranged on the knife frame 321. The foam nickel-based tape passes between the two tape scrapers 322, and the tape scrapers 322 adhere to the tape on the foam nickel-based tape.

[0031] There are two tapes on one side of the foam nickel-based tape. Since slurry will adhere to both sides of the foam nickel-based tape, tapes are provided on both sides of the foam nickel-based tape, so there are four tapes in total, two tape scraper assemblies 32, and four tape scrapers 322 in total, which can correspond to the four tapes and scrape off the slurry on the four tapes at the same time.

[0032] In this embodiment, the tape scraper 322 can be elastically retracted along the thickness direction of the nickel foam-based tape, so that the tape scraper 322 can be tightly attached to the tape by means of elastic force, ensuring that the slurry can be scraped cleanly.

[0033] Specifically, the tool holder 321 is U-shaped, and the two tape scrapers 322 correspond to the two side walls of the tool holder 321. A guide column 323 extending along the thickness direction of the foam nickel-based tape is fixed to the end of the tape scraper 322 away from the tape. The guide column 323 is slidably matched with the tool holder 321, and the guide column 323 will pass through the side wall of the tool holder 321, so that the tape scraper 322 can be retracted. A spring 324 is sleeved on the guide column 323, and the spring 324 is located between the tool holder 321 and the tape scraper 322. Therefore, relying on the elastic force of the spring 324, the tape scraper 322 can be attached to the tape; a thread is provided on the guide column 323, and a nut is threadedly connected to the guide column 323. The nut is located outside the tool holder 321, which can limit the position of the tape scraper 322 to prevent the tape scraper 322 from being pressed too tightly on the tape.

[0034] In this embodiment, the position of the knife holder 321 can be adjusted along the width direction of the nickel foam-based tape to adjust the distance between the two tape scraper assemblies 32, so as to adapt to nickel foam-based tapes of different widths.

[0035] Specifically, two ears extend from one end of the mounting plate 31 close to the tape scraper assembly 32, and the two ears correspond one to one with the two tape scraper assemblies 32. A connecting column is provided at one end of the tool holder 321 away from the other tool holder 321, and the connecting column passes through the ear. Two nuts are threadedly connected to the connecting column, and the connecting column is fixed to the ear by the two nuts. By adjusting the position of the two nuts, the position of the connecting column can also be adjusted, thereby adjusting the position of the tool holder 321.

[0036] In practice, when the nickel foam belt is being rolled up, it may move, that is, the nickel foam belt moves along its width direction. At this time, if the first scraper device 3 is fixed, the tape scraper 322 may not be aligned with the tape, and the slurry on the tape cannot be completely scraped off. Therefore, a deviation correction sensor 5 is provided. The deviation correction sensor 5 is located above the first scraper device 3. The deviation correction sensor 5 can detect the distance between the deviation correction sensor 5 and the side of the nickel foam belt, so as to determine whether the nickel foam belt is deviated.

[0037] The frame 1 is provided with a driving device 6 for driving the mounting plate 31 to move along the width direction of the nickel foam base tape. The driving device 6 operates according to the signal of the deviation correction sensor 5 to adjust the position of the tape scraper assembly 32 so that the tape scraper assembly 32 is aligned with the tape.

[0038] The mounting plate 31 and the frame 1 are slidably matched through the guide rail slider structure. The driving device 6 is an electric cylinder, which can accurately push the mounting plate 31 to slide. The correction sensor 5 is fixed on the mounting plate 31. There is an initial spacing between the correction sensor 5 and the foam nickel base belt. When the correction sensor 5 detects that the spacing becomes larger or smaller, it gives a signal to the electric cylinder, which controls the moving direction and distance of the mounting plate 31 to return the spacing to the initial spacing.

[0039] In some other embodiments, the correction sensor 5 can be fixed on the frame 1. Then, when the correction sensor 5 is detecting, it uses the position of the last detection as a reference to determine the position of the foam nickel base belt and then controls the movement of the mounting plate 31.

[0040] In this embodiment, the deviation correction sensor 5 may be a photoelectric sensor or an ultrasonic sensor.

[0041] In this embodiment, the second scraper device 4 includes two thickness-setting scraper assemblies arranged on the frame 1, and the thickness-setting scraper assemblies include a thickness-setting scraper 41 and an adjustment mechanism 42. The adjustment mechanism 42 can adjust the position of the thickness-setting scraper 41 along the thickness direction of the foam nickel-based strip. The foam nickel-based strip passes between the two thickness-setting scrapers 41, and the width of the thickness-setting scraper 41 is greater than the width of the foam nickel-based strip.

[0042] When in use, after the nickel foam tape passes through the two thickness-setting scrapers 41, the adjustment mechanism 42 is used to adjust the position of the thickness-setting scraper 41 to ensure that the distance between the thickness-setting scraper 41 and the nickel foam tape is appropriate so that the slurry thickness on the nickel foam tape meets the standard.

[0043] In this embodiment, the adjustment mechanisms 42 of the two thickness-setting scrapers 41 are different. The adjustment mechanism 42 of one thickness-setting scraper 41 has only two screws 421, and the adjustment mechanism 42 of the other thickness-setting scraper 41 includes two screws 421 and a cylinder 422.

[0044] For a thickness scraper 41, two screws 421 are arranged at intervals along the width direction of the nickel foam strip, and the screw 421 is rotatably set on the frame 1. The axial direction of the screw 421 is parallel to the thickness direction of the nickel foam strip, and the end of the screw 421 can contact the thickness scraper 41. The screw 421 is rotated to make the screw 421 extend and retract to push the thickness scraper 41 to move; the thickness scraper 41 is slidably matched on the frame 1 through the guide rail slider structure, but there is also a certain gap between the slider and the guide rail, so that the thickness scraper 41 will be slightly offset. In addition to adjusting the position of the thickness scraper 41, more than two screws 421 can also fine-tune the angle of the thickness scraper 41 to ensure that the thickness scraper 41 is parallel to the width direction of the nickel foam strip;

[0045] When the thickness-setting scraper 41 with only two screws 421 is adjusted, the screws 421 not only push the thickness-setting scraper 41 to move, but also push the thickness-setting scraper 41 to rotate slightly;

[0046] When the thickness scraper 41 with the cylinder 422 is adjusted, the cylinder 422 is located between the two screws 421, the extension direction of the piston rod of the cylinder 422 is parallel to the axial direction of the screw 421, the piston rod of the cylinder 422 is hinged to the thickness scraper 41, the piston rod of the cylinder 422 is extended and retracted to drive the thickness scraper 41 to move, and the two screws 421 are only responsible for adjusting the angle of the thickness scraper 41;

[0047] Under this structure, the thickness scraper 41 with the cylinder 422 will be farther away from the foam nickel-based strip in the initial state, while the thickness scraper 41 without the cylinder 422 will be closer to the foam nickel-based strip. The thickness scraper 41 with the cylinder 422 controls the distance between the two thickness scrapers 41 to facilitate the passage of the foam nickel-based strip, while the thickness scraper 41 without the cylinder 422 only needs fine-tuning. The thickness scraper 41 with the cylinder 422 controls the position of the thickness scraper 41 by adjusting the stroke of the cylinder 422.

[0048] In some other embodiments, both thickness-setting scrapers 41 may not have the cylinder 422 , and the position may be adjusted directly by the screw 421 ; or both thickness-setting scrapers 41 may have the cylinder 422 , and the position may be adjusted by the cylinder 422 .

[0049] In this embodiment, the screw rod 421 may be a screw micrometer structure, which allows for more precise adjustment.

[0050] In this embodiment, the thickness scraper 41 without the cylinder 422 is connected to a micrometer 423, which is fixed on the frame 1. The probe of the micrometer 423 is in contact with the thickness scraper 41. When the screw 421 is used for adjustment, the adjusted value can be seen in real time.

[0051] Preferably, the micrometer 423 is located above the screw rod 421, which makes adjustment more intuitive.

[0052] In this embodiment, a first slurry coating roller 21 is provided at the bottom of the slurry tank 2, and a plurality of second slurry coating rollers 22 are provided in the middle of the slurry tank 2. The second slurry coating rollers 22 are divided into at least two groups along the vertical direction, and each group of second slurry coating rollers 22 includes two second slurry coating rollers 22 arranged horizontally at intervals. A feed roller 23 is provided on the frame 1, and the foamed nickel-based strip is input from the feed roller 23, passes through the bottom of the first slurry coating roller 21 and between the two second slurry coating rollers 22 of each group of second slurry coating rollers 22 in sequence, and then output from the slurry tank 2; the bottom of the slurry tank 2 is arc-shaped, and when the foamed nickel-based strip passes under the first slurry coating roller 21, the slurry is squeezed onto the foamed nickel-based strip by the first slurry coating roller 21, and when the foamed nickel-based strip passes between the two second slurry coating rollers 22, the slurry is squeezed onto the foamed nickel-based strip by the extrusion of the two second slurry coating rollers 22.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A positive electrode sheet slurry drawing device, characterized in that: The invention comprises a frame, a slurry tank, a first scraper device and a second scraper device, wherein the slurry tank, the first scraper device and the second scraper device are arranged on the frame from top to bottom in sequence, and the foamed nickel-based tape passes through the first scraper device and the second scraper device in sequence after being output from the slurry tank; the first scraper device scrapes off the slurry on the tape, and the second scraper device scrapes the slurry on the foamed nickel-based tape to a preset thickness.

2. The positive electrode sheet drawing equipment according to claim 1, characterized in that: The first scraper device includes a mounting plate arranged on the frame and two tape scraper assemblies arranged on the mounting plate. The two tape scraper assemblies are arranged at intervals along the width direction of the foam nickel-based belt and correspond to the tapes at the edges of both sides of the foam nickel-based belt.

3. The positive electrode sheet drawing equipment according to claim 2, characterized in that: The tape scraper assembly comprises a knife frame and two tape scrapers arranged on the knife frame. The foam nickel-based tape passes between the two tape scrapers, and the tape scrapers are attached to the tape on the foam nickel-based tape.

4. The positive electrode sheet drawing equipment according to claim 3, characterized in that: The tape scraper can be elastically retracted along the thickness direction of the foam nickel-based tape.

5. The positive electrode sheet drawing equipment according to claim 4, characterized in that: A guide post extending along the thickness direction of the foam nickel-based tape is fixed to one end of the tape scraper away from the tape, the guide post is slidably matched with the tool holder, a spring is sleeved on the guide post, and the spring is located between the tool holder and the tape scraper.

6. The positive electrode sheet drawing equipment according to claim 3, characterized in that: The position of the knife holder can be adjusted along the width direction of the nickel foam base tape to adjust the distance between the two tape scraping assemblies.

7. The positive electrode sheet drawing equipment according to claim 2, characterized in that: It also includes a deviation correction sensor located above the first scraping device, and the deviation correction sensor can detect the distance between the deviation correction sensor and the side edge of the foam nickel-based belt to determine the position of the foam nickel-based belt; The frame is provided with a driving device for driving the mounting plate to move along the width direction of the nickel foam base tape. The driving device operates according to the signal of the deviation correction sensor to adjust the position of the tape scraper assembly so that the tape scraper assembly is aligned with the tape.

8. The positive electrode sheet drawing equipment according to claim 1, characterized in that: The second scraper device includes two thickness-setting scraper assemblies arranged on the frame, and the thickness-setting scraper assemblies include thickness-setting scrapers and an adjustment mechanism. The adjustment mechanism can adjust the position of the thickness-setting scraper along the thickness direction of the foam nickel-based strip. The foam nickel-based strip passes between the two thickness-setting scrapers, and the width of the thickness-setting scraper is greater than the width of the foam nickel-based strip.

9. The positive electrode sheet drawing equipment according to claim 8, characterized in that: The adjustment mechanism includes at least two screws arranged at intervals along the width direction of the nickel foam base strip. The screws are rotatably arranged on the frame. The axial direction of the screws is parallel to the thickness direction of the nickel foam base strip. The screws are rotated to push the thickness-setting scraper to move.

10. The positive electrode sheet drawing equipment according to claim 9, characterized in that: The adjusting mechanism comprises a cylinder, which is located between two of the screw rods. The telescopic direction of the piston rod of the cylinder is parallel to the axial direction of the screw rod. The piston rod of the cylinder is hinged to the thickness-setting scraper.

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