Pole piece coating equipment

Abstract

The utility model relates to the technical field of battery manufacturing, and discloses pole piece coating equipment which comprises a base, a coating mechanism and a scraping mechanism, the coating mechanism and the scraping mechanism are respectively connected with the base, the coating mechanism is used for coating preset slurry on the surface of a pole piece, and the coating mechanism and the scraping mechanism are sequentially arranged along the conveying direction of the pole piece; the material scraping mechanism comprises a supporting roller and a scraping roller, the supporting roller and the scraping roller are both connected with the base, the scraping roller is located above the supporting roller, the supporting roller is used for supporting the pole piece, a plurality of scraping pieces arranged at intervals in the axial direction are arranged on the outer wall of the scraping roller, and the scraping pieces are arranged on the outer wall of the scraping roller. The scraping blade is used for scraping the preset slurry coated on the pole piece to form a groove; the utility model mainly solves the technical problem of how to scrape the slurry coated on the pole piece so as to reduce the final coating weight of the pole piece.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a pole piece coating device. Background Art

[0002] Lithium-ion batteries, due to their advantages such as high voltage, large capacity, long life cycle, low self-discharge rate, and wide operating temperature range, have attracted widespread attention in society and are increasingly widely used in many fields. Improving energy and power density is a key improvement direction for lithium-ion battery performance. However, as the coating weight of the internal electrode of the battery increases, the internal resistance of the battery inevitably increases, resulting in a decrease in battery capacity, increased battery heat generation, a decrease in battery output voltage, and a decrease in battery output power. Furthermore, this reduces charging efficiency and can easily lead to problems such as thermal runaway. Utility Model Content

[0003] The utility model provides a pole piece coating device, which mainly solves the technical problem of how to scrape off part of the slurry coated on the pole piece to reduce the final coating weight of the pole piece.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A pole piece coating device comprises a base and a coating mechanism and a scraping mechanism respectively connected to the base, wherein the coating mechanism is used to coat a preset slurry on the surface of the pole piece, and the coating mechanism and the scraping mechanism are arranged in sequence along the conveying direction of the pole piece;

[0006] The scraping mechanism includes a supporting roller and a scraping roller, both of which are connected to the base, and the scraping roller is located above the supporting roller. The supporting roller is used to support the pole piece. A plurality of scraping blades arranged at intervals along the axial direction are provided on the outer wall of the scraping roller, and the scraping blades are used to scrape grooves out of the preset slurry coated on the pole piece.

[0007] In one of the technical solutions, the electrode coating equipment further includes a heating device, which conducts heat to the scraper roller to heat the scraper roller.

[0008] In one of the technical solutions, the electrode coating equipment is provided with a vacuum chamber, and the scraping mechanism is provided in the vacuum chamber.

[0009] In one of the technical solutions, the electrode coating equipment further includes a top cover, which is connected to the top of the base and together with the base forms the vacuum chamber.

[0010] In one technical solution, the top cover includes an upper cover portion, a first shielding portion and a second shielding portion;

[0011] The upper cover is connected to the top of the base and is located above the scraping mechanism; the first shielding portion and the second shielding portion are arranged on opposite sides of the upper cover and are respectively downwardly close to the pole piece.

[0012] In one of the technical solutions, a vacuum hole is provided on the upper cover.

[0013] In one of the technical solutions, the support roller is rotatably connected to the base, and the support roller is configured to be rotatable relative to the base due to the friction force applied by the pole piece.

[0014] In one of the technical solutions, the electrode coating equipment further includes a power device, which is respectively connected to the base and the scraping roller and is used to drive the scraping roller to rotate relative to the base.

[0015] In one of the technical solutions, the coating mechanism includes a coating roller and a pressure roller;

[0016] The coating roller and the pressing roller are both rotatably connected to the base. The coating roller and the pressing roller are used to jointly clamp the pole piece. The coating roller is used to coat a preset slurry on the surface of the pole piece.

[0017] In one of the technical solutions, the coating mechanism also includes a transfer roller, which is rotatably connected to the base. The transfer roller is used to receive the preset slurry and transfer the preset slurry to the coating roller. An adjustment hole is provided on the base, and the end of the transfer roller is inserted into the adjustment hole. The adjustment hole is used to adjust the distance between the transfer roller and the coating roller.

[0018] Compared with the prior art, the electrode coating equipment provided by the present invention has at least the following beneficial effects:

[0019] During operation, the electrode will first pass through the coating mechanism during the transportation process, and the coating mechanism will coat the preset slurry on the upper surface of the electrode. When the electrode is transported to the scraping mechanism, the electrode will not fall down because it is supported by the support roller. At this time, the scraping roller above the electrode will scrape off the part of the slurry coated on the upper surface of the electrode, so that the preset slurry coated on the electrode is scraped out of multiple spaced grooves by the scraper on the scraping roller, thereby achieving the purpose of reducing the weight of the electrode. This solution mainly adds support rollers and scraping rollers on the basis of the original coating mechanism. Therefore, this solution has the advantages of simple structure and low cost while achieving the function of reducing the weight of the electrode, and will not significantly increase the volume of the original coating equipment, so that the coating equipment can maintain a smaller footprint. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic structural diagram of a pole piece coating device provided in an embodiment of the present application;

[0022] Figure 2 A schematic structural diagram of a pole piece coating device provided in an embodiment of the present application from another angle;

[0023] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0024] Figure 4 for Figure 2 The schematic diagram of the structure of the electrode coating equipment shown is after the top cover is hidden;

[0025] Figure 5 This is a schematic structural diagram of the scraper roller provided in an embodiment of the present application.

[0026] Reference numerals:

[0027] 1. Base; 11. Adjustment hole; 2. Coating mechanism; 21. Coating roller; 22. Pressing roller; 23. Transfer roller; 3. Scraping mechanism; 31. Support roller; 32. Scraping roller; 321. Scraping blade; 4. Vacuum chamber; 5. Top cover; 51. Upper cover; 511. Vacuum hole; 52. First shielding part; 53. Second shielding part; 10. Pole piece; 20. Groove. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0029] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms, "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply 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 this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0033] Please also refer to Figures 1 to 5 An embodiment of the utility model provides a pole piece coating device, which mainly includes a base 1, a coating mechanism 2 and a scraping mechanism 3, wherein the coating mechanism 2 and the scraping mechanism 3 are both connected to the base 1 and arranged in sequence along the conveying direction of the pole piece 10, wherein the coating mechanism 2 is used to coat a preset slurry on the upper surface of the pole piece 10, and the scraping mechanism 3 is used to scrape off part of the slurry coated on the pole piece 10, thereby reducing the weight of the pole piece 10.

[0034] In this embodiment, the coating mechanism 2 preferably includes a coating roller 21 and a pressure roller 22, and the coating roller 21 and the pressure roller 22 are both rotatably connected to the base 1. During coating, the coating roller 21 and the pressure roller 22 jointly clamp the electrode 10, and the coating roller 21 applies the preset slurry on the surface of the electrode 10. The electrode 10 will drive the pressure roller 22 to rotate during transportation, so that the electrode 10 is always in contact with the pressure roller 22 in a static friction manner during transportation, reducing the friction between the pressure roller 22 and the electrode 10, and reducing the risk of the electrode 10 being worn by the pressure roller 22. In addition, the coating mechanism 2 also includes a transfer roller 23, which is also rotatably connected to the base 1. When the transfer roller 23 rotates relative to the base 1, it is used to receive the preset slurry and transfer the preset slurry to the coating roller 21. To ensure the reliability of the transfer roller 23 in transferring the preset slurry to the coating roller 21, the present embodiment provides an adjustment hole 11 on the base 1, and the end of the transfer roller 23 is designed to pass through the adjustment hole 11, so that the transfer roller 23 can adjust the distance between it and the coating roller 21 by moving in the adjustment hole 11, thereby ensuring the reliability of the transfer roller 23 in transferring the preset slurry to the coating roller 21. The above-mentioned coating mechanism 2 is also called a transfer coating mechanism. In other embodiments, the coating mechanism 2 can also adopt other structural methods to realize the function of coating the electrode 10 with the preset slurry.

[0035] In this embodiment, the scraping mechanism 3 specifically includes a support roller 31 and a scraping roller 32. Both the support roller 31 and the scraping roller 32 are connected to the base 1, and the scraping roller 32 is located above the support roller 31. The support roller 31 is used to support the electrode 10 so that the electrode 10 will not fall downward. A plurality of scrapers 321 arranged at intervals along the axial direction are provided on the outer wall of the scraping roller 32. The scraper 321 is used to scrape out grooves 20 in the preset slurry coated on the electrode 10.

[0036] During operation, the electrode 10 will first pass through the coating mechanism 2 during the transportation process. The coating mechanism 2 will coat the preset slurry on the upper surface of the electrode 10. When the electrode 10 is transported to the scraping mechanism 3, the electrode 10 will not fall down because it is supported by the support roller 31. At this time, the scraping roller 32 above the electrode 10 will scrape off the part of the slurry coated on the upper surface of the electrode 10, so that the preset slurry coated on the electrode 10 is scraped out of multiple spaced grooves 20 by the scraper 321 on the scraping roller 32, thereby achieving the purpose of reducing the weight of the electrode 10. This solution mainly adds the support roller 31 and the scraping roller 32 on the basis of the original coating mechanism. Therefore, this solution has the advantages of simple structure and low cost while achieving the function of reducing the weight of the electrode 10, and will not significantly increase the volume of the original coating equipment, so that the coating equipment can maintain a smaller footprint.

[0037] In this embodiment, the support roller 31 is rotatably connected to the base 1. The support roller 31 is designed to be able to rotate relative to the base 1 due to the static friction force exerted by the pole piece 10. Through such a design, sliding friction between the pole piece 10 and the support roller 31 during transportation can be avoided, so that the pole piece 10 is always in contact with the support roller 31 in a static friction manner during transportation, reducing the friction between the support roller 31 and the pole piece 10, and reducing the risk of the pole piece 10 being worn by the support roller 31.

[0038] In this embodiment, the electrode coating equipment also includes a power device (not shown in the figure), which is respectively connected to the base 1 and the scraping roller 32. The power device can be a motor, which is used to drive the scraping roller 32 to rotate relative to the base 1. By designing the scraping roller 32 to be driven to rotate by the power device, the scraping roller 32 in the rotating state can efficiently scrape the electrode 10 per unit time to meet the operational requirements of maintaining efficient transportation of the electrode 10, and ensure that the electrode 10 can maintain a high production efficiency while realizing the scraping function of the electrode 10.

[0039] In this embodiment, the electrode coating equipment of this embodiment also includes a heating device (not shown in the figure). In addition, a vacuum chamber 4 is provided on the electrode coating equipment, wherein the heating device conducts heat to the scraping roller 32, thereby heating the scraping roller 32. The scraping roller 32 in a heated state can vaporize the preset slurry scraped off. The entire scraping mechanism 3 is arranged in the vacuum chamber 4, so that the vaporized preset slurry can be sucked to a designated location outside, preventing the vaporized preset slurry from being diffused in the air, thereby improving the safety of surrounding workers. By designing the scraping roller 32 to be heated and designing the vacuum chamber 4, the efficiency of the scraping mechanism 3 in scraping the electrode 10 can be greatly improved, so that the electrode 10 can be transported at a higher speed, thereby further greatly improving the production efficiency of the electrode 10.

[0040] In this embodiment, the electrode coating equipment also includes a top cover 5, which is connected to the top of the base 1 and is jointly enclosed with the base 1 to form the above-mentioned vacuum chamber 4, wherein the top cover 5 specifically includes an upper cover portion 51, a first shielding portion 52 and a second shielding portion 53. The upper cover portion 51 is connected to the top of the base 1 and is located above the scraping mechanism 3. The first shielding portion 52 and the second shielding portion 53 are respectively arranged on opposite sides of the upper cover portion 51 and are respectively downwardly close to the electrode 10. By providing this top cover 5, on the one hand, it is convenient to form the vacuum chamber 4, and on the other hand, it plays an effective dust-proof role. Among them, a vacuum hole 511 is preferably provided on the upper cover portion 51, and the vacuum hole 511 is connected to the vacuum chamber 4. By extracting the vacuum hole 511, the vacuum chamber 4 can be placed in a negative pressure state.

[0041] The following is an example of six types of batteries, and the relevant experimental results are shown in the following table.

[0042]

[0043] Among them, Comparative Examples 1, 2, and 3 in the above table all use batteries with electrode sheets 10 without grooves 20, while Examples 1, 2, and 3 all use batteries with electrode sheets 10 having grooves 20. As can be seen from the above table, when the thickness of the electrode sheets 10 is the same, the batteries using the electrode sheets 10 with grooves 20 clearly have lower internal resistance, higher initial efficiency, and higher rate.

[0044] The above is merely a preferred embodiment of the present invention and only specifically describes the technical principles of the present invention. These descriptions are intended only to explain the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be imagined by those skilled in the art without inventive effort, shall be included within the scope of protection of the present invention.

Claims

1. A pole piece coating device, characterized in that: The invention comprises a base (1) and a coating mechanism (2) and a scraping mechanism (3) respectively connected to the base (1), wherein the coating mechanism (2) is used to coat a preset slurry on the upper surface of the electrode, and the coating mechanism (2) and the scraping mechanism (3) are arranged in sequence along the conveying direction of the electrode; The scraping mechanism (3) comprises a supporting roller (31) and a scraping roller (32), wherein both the supporting roller (31) and the scraping roller (32) are connected to the base (1), and the scraping roller (32) is located above the supporting roller (31), and the supporting roller (31) is used to support the pole piece. A plurality of scraping blades (321) arranged at intervals along the axial direction are provided on the outer wall of the scraping roller (32), and the scraping blades (321) are used to scrape grooves out of the preset slurry coated on the pole piece.

2. The electrode coating device according to claim 1, characterized in that: The pole piece coating device further comprises a heating device, wherein the heating device conducts heat with the scraping roller (32) to heat the scraping roller (32).

3. The electrode coating device according to claim 2, characterized in that: The pole piece coating device is provided with a vacuum chamber (4), and the scraping mechanism (3) is provided in the vacuum chamber (4).

4. The electrode coating device according to claim 3, characterized in that: The electrode coating device further comprises a top cover (5), wherein the top cover (5) is connected to the top of the base (1) and is jointly enclosed with the base (1) to form the vacuum chamber (4).

5. The electrode coating device according to claim 4, characterized in that: The top cover (5) comprises an upper cover portion (51), a first shielding portion (52) and a second shielding portion (53); The upper cover (51) is connected to the top of the base (1) and is located above the scraper mechanism (3); the first shielding portion (52) and the second shielding portion (53) are respectively arranged on opposite sides of the upper cover (51) and are respectively downwardly close to the pole piece.

6. The electrode coating device according to claim 5, characterized in that: A vacuum hole (511) is provided on the upper cover portion (51), and the vacuum hole (511) is communicated with the vacuum chamber (4).

7. The electrode coating device according to claim 1, characterized in that: The support roller (31) is rotatably connected to the base (1), and the support roller (31) is configured to be rotatable relative to the base (1) due to the friction force applied by the pole piece.

8. The electrode coating device according to claim 1, characterized in that: The electrode coating device further comprises a power device, wherein the power device is respectively connected to the base (1) and the scraping roller (32), and is used to drive the scraping roller (32) to rotate relative to the base (1).

9. The electrode coating device according to any one of claims 1 to 8, characterized in that: The coating mechanism (2) comprises a coating roller (21) and a pressure roller (22); The coating roller (21) and the pressing roller (22) are both rotatably connected to the base (1); the coating roller (21) and the pressing roller (22) are used to jointly clamp the electrode; and the coating roller (21) is used to coat a preset slurry on the upper surface of the electrode.

10. The electrode coating device according to claim 9, characterized in that: The coating mechanism (2) further comprises a transfer roller (23), the transfer roller (23) being rotatably connected to the base (1), the transfer roller (23) being used to receive a preset slurry and transfer the preset slurry to the coating roller (21), an adjustment hole (11) being provided on the base (1), an end of the transfer roller (23) being passed through the adjustment hole (11), and the adjustment hole (11) being used to adjust the distance between the transfer roller (23) and the coating roller (21).

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