Coating gasket and pole piece coating device

Abstract

The utility model relates to the technical field of lithium battery production, in particular to a coating gasket and a pole piece coating device. The coating gasket comprises a first flow guide plate, a gasket body and a second flow guide plate which are sequentially connected, the first flow guide plate and the second flow guide plate are arranged at intervals in the length direction of the gasket body to form a coating launder, the first flow guide plate, the gasket body and the second flow guide plate define a flow guide groove communicated with the coating launder, and the flow guide plate is arranged at an outlet of the coating launder. A first chamfer is arranged at the corner of the first guide plate, the first guide plate protrudes and extends outwards from the first chamfer to the direction of the second guide plate to form a first step, a second chamfer is arranged at the corner of the second guide plate, and the second guide plate protrudes and extends outwards from the second chamfer to form a second step. A second step is formed by outwards protruding and extending towards the direction of the first flow guide plate, and the thicknesses of the first step and the second step are both smaller than the thickness of the coating gasket. The thickness of the slurry coated on the edge of the pole piece can be reduced, so that the problem that the edge of the pole piece is too thick is avoided.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production technology, and in particular to a coating pad and electrode coating device. Background Technology

[0002] Lithium-ion battery electrode coating is a key process in battery production. Its purpose is to uniformly coat the well-stirred slurry onto the current collector (aluminum foil for the positive electrode and copper foil for the negative electrode) and then dry it to form the electrode.

[0003] In the electrode coating process, to reduce energy consumption and improve drying efficiency, the slurry has high solids content and viscosity, poor fluidity, and high surface tension, causing it to tend to shrink. This shrinkage can lead to accumulation and thickening at the edges, resulting in a thicker coating at the electrode edges after coating. When the coated electrode is wound into a roll, the edges may bulge, and in severe cases, it may burst or break, causing quality problems. Current extrusion coating methods use a beveled design at the outlet of the coating pad. While this bevel design partially releases fluid pressure when the slurry exits, alleviating the edge bulging problem to some extent, the effect is not ideal, and there is still a high probability of thicker electrode edges, leading to quality issues. Utility Model Content

[0004] The technical problem to be solved by this utility model embodiment is to provide a coating pad and an electrode coating device to solve the problem that the two sides of the electrode are too thick after the electrode coating operation in the prior art.

[0005] This utility model discloses a coating pad, comprising a first guide plate, a pad body, and a second guide plate connected in sequence. The first guide plate and the second guide plate are spaced apart along the length direction of the pad body to form a coating channel. The first guide plate, the pad body, and the second guide plate enclose a guide channel that communicates with the coating channel and is used to communicate with an external coating die. At the outlet of the coating channel, a first chamfer is provided at the corner of the first guide plate. From the first chamfer, the first guide plate extends outward toward the second guide plate to form a first step. A second chamfer is provided at the corner of the second guide plate. From the second chamfer, the second guide plate extends outward toward the first guide plate to form a second step. The thickness of the first step and the second step is less than the thickness of the coating pad.

[0006] Optionally, both the first step and the second step include an integrally formed first sub-step and a second sub-step. The first sub-step is a right-angled triangle, and the second sub-step is a rectangle. The first right-angled side of the first sub-step is flush with a long side of the second sub-step, and the second right-angled side is flush with a wide side of the second sub-step. The long side of the second sub-step is parallel to the sidewall of the coating channel.

[0007] Optionally, the distance between the first guide plate and the second guide plate is 400-650mm, and the length of the second sub-step is 10-20mm and the width is 2-4mm.

[0008] Optionally, the length of the first right-angled side of the first sub-step is 2-3 mm.

[0009] Optionally, the length of the second right-angled side of the first sub-step is 2-4 mm.

[0010] Optionally, the thickness of both the first step and the second step is 20%-60% of the thickness of the coated pad.

[0011] Optionally, the first guide plate and the second guide plate are arranged symmetrically about the center line of the gasket body.

[0012] Optionally, the first guide plate, the gasket body, the second guide plate, the first step, and the second step are integrally formed.

[0013] Optionally, the gasket body is provided with a locking hole for locking the coating gasket to the external coating die head.

[0014] This utility model also discloses an electrode coating device, characterized in that it includes a coating pad as described in any of the above claims.

[0015] Compared with the prior art, the beneficial effects of the coating pad and electrode coating device provided in this embodiment of the present invention are as follows: The coating pad provided in this embodiment of the present invention includes a first guide plate, a pad body, and a second guide plate connected in sequence. The first guide plate and the second guide plate are spaced apart along the length direction of the pad body to form a coating channel. The first guide plate, the pad body, and the second guide plate enclose and form a guide channel communicating with the coating channel. The slurry from the external coating die enters the coating channel through the guide channel. Because a first chamfer is provided at the corner of the first guide plate and a second chamfer is provided at the corner of the second guide plate at the opening of the coating channel, the slurry flows from... When the coating flow channel is sprayed, the first and second chamfers can release the slurry pressure. At the opening of the coating flow channel, the first guide plate extends outward from the first chamfer toward the second guide plate to form a first step, and the second guide plate extends outward from the second chamfer toward the first guide plate to form a second step. The thickness of the first and second steps is less than the thickness of the coating pad. The first and second steps can occupy the thickness space through which the slurry flows, hindering the natural spraying of local slurry. This simply and effectively reduces the thickness of the slurry coated on the edge of the electrode, thereby avoiding quality problems such as excessively thick electrode edges and edge bursting during winding. Attached Figure Description

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0017] Figure 1 This is a top view schematic diagram of the coated pad provided in this embodiment of the utility model;

[0018] Figure 2 yes Figure 1 Enlarged view of a portion of position A in the middle;

[0019] Figure 3 This is a three-dimensional schematic diagram of the first step portion of the coated pad provided in this embodiment of the present invention;

[0020] Figure 4 This is a side view of the first step portion of the coated pad provided in this embodiment of the present invention;

[0021] Figure 5 yes Figure 1 A magnified view of a portion of position B in the middle.

[0022] The labels for the attached figures are as follows:

[0023] 110. First guide plate; 111. First chamfer; 120. Gasket body; 121. Locking hole; 130. Second guide plate; 131. Second chamfer; 100a. Coating channel; 100b. Guide channel; 140. First step; 141. First sub-step; 142. Second sub-step; 150. Second step. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0025] This utility model embodiment provides a coated gasket, such as Figures 1 to 5 As shown, the coating pad includes a first guide plate 110, a pad body 120, and a second guide plate 130 connected in sequence. The first guide plate 110 and the second guide plate 130 are spaced apart along the length of the pad body 120 to form a coating channel 100a. The first guide plate 110, the pad body 120, and the second guide plate 130 enclose a guide channel 100b that communicates with the coating channel 100a and is used to communicate with an external coating die head. At the outlet of the coating channel 100a, the first guide plate... A first chamfer 111 is provided at the corner of 110. The first guide plate 110 extends outward from the first chamfer 111 toward the direction of the second guide plate 130 to form a first step 140. A second chamfer 131 is provided at the corner of the second guide plate 130. The second guide plate 130 extends outward from the second chamfer 131 toward the direction of the first guide plate 110 to form a second step 150. The thickness of the first step 140 and the second step 150 is less than the thickness of the coated gasket.

[0026] The coating pad provided in this embodiment of the utility model includes a first guide plate 110, a pad body 120, and a second guide plate 130 connected in sequence. The first guide plate 110 and the second guide plate 130 are spaced apart along the length direction of the pad body 120 to form a coating channel 100a. The first guide plate 110, the pad body 120, and the second guide plate 130 enclose a guide channel 100b that communicates with the coating channel 100a. The slurry from the external coating die enters the coating channel 100a through the guide channel 100b. Since a first chamfer 111 is provided at the corner of the first guide plate 110 and a second chamfer 131 is provided at the corner of the second guide plate 130 at the opening of the coating channel 100a, when the slurry is sprayed out from the coating channel 100a, the first guide plate 110... The chamfer 111 and the second chamfer 131 can release the slurry pressure. At the opening of the coating flow channel 100a, the first guide plate 110 extends outward from the first chamfer 111 toward the second guide plate 130 to form a first step 140. The second guide plate 130 extends outward from the second chamfer 131 toward the first guide plate 110 to form a second step 150. The thickness of the first step 140 and the second step 150 is less than the thickness of the coating pad. The first step 140 and the second step 150 can occupy the thickness space through which the slurry flows, preventing the local slurry from being naturally sprayed out. This simply and effectively reduces the thickness of the slurry coated on the edge of the electrode, thereby avoiding quality problems such as the electrode edge being too thick and the edge bursting during winding.

[0027] Since the edges of the electrode sheets are ultimately cut off and discarded during the subsequent slitting process in the winding roll, this application employs a first step 140 and a second step 150 to physically reduce the thickness of the slurry coating on the electrode sheet edges. This not only does not affect the normal function of the electrode sheet but also avoids the problem of edge bulging after winding the roll. Furthermore, this solution allows operators to appropriately increase the solid content and viscosity of the slurry, reducing coating energy consumption and improving coating drying efficiency.

[0028] In an optional embodiment of this application, reference is made to Figures 2 to 4 The first step 140 and the second step 150 both include an integrally formed first sub-step 141 and a second sub-step 142. The first sub-step 141 is a right-angled triangle, and the second sub-step 142 is a rectangle. The first right-angled side bf of the first sub-step 141 is flush with a long side cf of the second sub-step 142, and the second right-angled side af is flush with a wide side ef of the second sub-step 142. The long sides cf and de of the second sub-step 142 are parallel to the sidewall of the coating flow channel 100a.

[0029] The first step 140 and the second step 150 are both composed of a first sub-step 141 in the shape of a right triangle and a second sub-step 142 in the shape of a rectangle. This can effectively thin the coating formed on both sides of the electrode without affecting the coating in the middle area of ​​the electrode. The slurry sprayed from the coating channel 100a is coated on the current collector to form a uniform coating layer, which can better control the coating thickness of the slurry.

[0030] In an optional embodiment of this application, the distance between the first guide plate 110 and the second guide plate 130 is 400-650mm, and the length of the second sub-step 142 is 10-20mm and the width is 2-4mm.

[0031] By setting the distance between the first guide plate 110 and the second guide plate 130 to 400-650mm, the flow of slurry in the coating channel 100a is effectively controlled, avoiding slurry accumulation or uneven flow within the coating channel 100a, thus improving coating uniformity. Correspondingly, the length of the second sub-step 142 is 10-20mm and the width is 2-4mm. While thinning the slurry thickness at the edges of the electrode sheet, it improves the stability of the coating in the middle area of ​​the electrode sheet, ensuring the strength and lifespan of the step, and does not interfere with the coating in the middle area of ​​the electrode sheet.

[0032] The distance between the first guide plate 110 and the second guide plate 130 can be 400mm, 420mm, 440mm, 460mm, 480mm, 500mm, 520mm, 540mm, 560mm, 580mm, 600mm, 620mm, 640mm, 650mm, etc., which can be set by the designer according to the required electrode coating size. The length of the second sub-step 142 can be 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc., and the width can be 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3.0mm, 3.2mm, 3.4mm, 3.6mm, 6.8mm, 4.0mm, etc., which can be set by the designer according to the distance between the first guide plate 110 and the second guide plate 130. Preferably, the second sub-step 142 has a length of 15mm and a width of 3mm.

[0033] In an optional embodiment of this application, the length of the first right-angled side bf of the first sub-step 141 is 2-3 mm. This design effectively guides the slurry flow and releases fluid pressure when it is sprayed from the coating flow channel 100a, without affecting the overall structural stability of the coating pad due to excessive length. The length of the first right-angled side bf of the first sub-step 141 can be 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm, etc., and designers can set it according to requirements. Preferably, the length of the first right-angled side of the first sub-step 141 is 2 mm.

[0034] In an optional embodiment of this application, the length of the second right-angled side af of the first sub-step 141 is 2-4 mm. This design provides a good inclination angle for the first chamfer 111, effectively guiding the flow direction of the slurry at the first step 140 when it is sprayed from the coating flow channel 100a, reducing slurry accumulation or excessive dispersion at the first step 140. This design ensures that the slurry can smoothly change direction when flowing through the first sub-step 141, further optimizing the uniformity of slurry flow. The length of the second right-angled side af of the first sub-step 141 can be 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3.0 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4.0 mm, etc., and designers can set it according to requirements. Preferably, the length of the second right-angled side of the first sub-step 141 is 4 mm.

[0035] In an optional embodiment of this application, the thickness of the first step 140 and the second step 150 is both 20%-60% of the thickness of the coating pad. If the thickness of the first step 140 and the second step 150 is too thin, the step strength will be insufficient, and the service life of the coating pad will be short. If the step is too thick, the edge of the electrode will be excessively thinned, and the coated electrode will easily form severe line marks. Therefore, the thickness of the first step 140 and the second step 150 is both 20%-60% of the thickness of the coating pad, which can ensure the service life of the coating pad while effectively thinning the thickness of the slurry on both sides of the electrode.

[0036] The thickness of both the first step 140 and the second step 150 can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, etc., of the coating electrode thickness. Preferably, the thickness of both the first step 140 and the second step 150 is 40% of the coating pad thickness.

[0037] In an optional embodiment of this application, the first guide plate 110 and the second guide plate 130 are arranged symmetrically about the center line of the gasket body 120. This simplifies mold design and processing when manufacturing the coated gasket and reduces performance differences caused by manufacturing errors. Furthermore, the coated gasket has high versatility.

[0038] In an optional embodiment of this application, the first guide plate 110, the gasket body 120, the second guide plate 130, the first step 140, and the second step 150 are integrally formed. This integral design ensures that there are no gaps between the components, thereby improving the strength and stability of the overall structure. This design reduces deformation or damage caused by weak points at component connections, while also ensuring a smoother and more uniform flow path for the slurry within the flow channel, resulting in stable flow.

[0039] In an optional embodiment of this application, reference is made to Figure 1 The gasket body 120 is provided with a locking hole 121 for locking the coating gasket to the external coating die head.

[0040] It should be noted that when the coating pad is installed on the coating die head, it is installed between the upper and lower dies of the coating die head. Therefore, screws can be used to pass through the locking holes 121 on the upper and lower dies of the coating die head and the coating pad to fix the coating pad together with the coating die head and prevent the coating pad from moving. In one embodiment, multiple locking holes 121 are provided, which can effectively enhance the stability of the coating pad installation.

[0041] This application also provides an electrode coating apparatus, characterized in that it includes a coating pad as described above. This electrode coating apparatus has the same structure and beneficial effects as the coating pad in the foregoing embodiments. The structure and beneficial effects of the coating pad have been described in detail in the foregoing embodiments and will not be repeated here.

[0042] It should be understood that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of this utility model.

Claims

1. A coated gasket, characterized in that, The device includes a first guide plate, a gasket body, and a second guide plate connected in sequence. The first guide plate and the second guide plate are spaced apart along the length of the gasket body to form a coating channel. The first guide plate, the gasket body, and the second guide plate enclose a channel that communicates with the coating channel and is used to communicate with an external coating die. At the outlet of the coating channel, a first chamfer is provided at the corner of the first guide plate. From the first chamfer, the first guide plate extends outward toward the second guide plate to form a first step. A second chamfer is provided at the corner of the second guide plate. From the second chamfer, the second guide plate extends outward toward the first guide plate to form a second step. The thickness of both the first step and the second step is less than the thickness of the coating gasket.

2. The coated gasket according to claim 1, characterized in that, Both the first step and the second step include an integrally formed first sub-step and a second sub-step. The first sub-step is a right-angled triangle, and the second sub-step is a rectangle. The first right-angled side of the first sub-step is flush with a long side of the second sub-step, and the second right-angled side is flush with a wide side of the second sub-step. The long side of the second sub-step is parallel to the sidewall of the coating channel.

3. The coated gasket according to claim 2, characterized in that, The distance between the first guide plate and the second guide plate is 400-650mm, and the length of the second sub-step is 10-20mm and the width is 2-4mm.

4. The coated gasket according to claim 3, characterized in that, The length of the first right-angled side of the first sub-step is 2-3mm.

5. The coated gasket according to claim 4, characterized in that, The length of the second right-angled side of the first sub-step is 2-4mm.

6. The coated gasket according to claim 1, characterized in that, The thickness of both the first step and the second step is 20%-60% of the thickness of the coated pad.

7. The coated gasket according to any one of claims 1-6, characterized in that, The first guide plate and the second guide plate are arranged symmetrically about the center line of the gasket body.

8. The coated gasket according to any one of claims 1-6, characterized in that, The first guide plate, the gasket body, the second guide plate, the first step, and the second step are integrally formed.

9. The coated gasket according to any one of claims 1-6, characterized in that, The gasket body is provided with a locking hole for locking the coating gasket to the external coating die head.

10. An electrode coating apparatus, characterized in that, Includes the coated pad as described in any one of claims 1-9.

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