Coating gasket and die head

Abstract

The utility model discloses a coating gasket and a die head, the coating gasket comprises a gasket main body, the gasket main body comprises a main body part, connecting parts and a thinning area, two ends of the thinning area are connected with the main body part through the corresponding connecting parts, the thickness of the thinning area is smaller than that of the connecting parts, and a groove strip is arranged in the thinning area. According to the utility model, the thinning area is arranged on the coating gasket, and the groove strips are arranged in the thinning area, so that a groove structure can be directly formed in a wet film coating stage, the technical effect which is the same as that of the existing laser or mechanical grooving process is realized, and the phenomenon that a heat affected zone and dust are easily generated through laser or mechanical grooving is avoided; meanwhile, the structure of an electrode material is possibly damaged, and the performance of the battery is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery processing technology, and in particular to a coating pad and a die head. Background Technology

[0002] In the manufacturing process of lithium-ion batteries, wetting is a crucial step, typically occurring after electrolyte injection and before formation. The main function of wetting is to ensure the electrolyte fully penetrates the electrode materials, guaranteeing effective ion exchange between them and enabling normal charge and discharge functions. The level of wettability significantly impacts the quality of the SEI (Solid Electrolyte Interface) film. During wetting, the electrolyte reacts with the electrode material surface to form the SEI film. High wettability promotes the formation of a uniform, dense, and stable SEI film. Uniform wetting allows for a more even reaction of the electrolyte on the electrode surface, resulting in a better-covering and protective SEI film. Low wettability leads to uneven SEI film formation, with localized defects due to insufficient electrolyte wetting. This makes the electrode materials more susceptible to electrolyte corrosion in these areas, triggering side reactions, consuming lithium ions and electrolyte, and ultimately reducing battery capacity.

[0003] In existing technologies, one method to improve battery wettability is by grooving the electrode sheets. The principle behind this improved wettability is that the grooves on the electrode sheets provide additional channels, facilitating faster and more uniform diffusion of the electrolyte into the electrode material. Compared to smooth surfaces, textured surfaces significantly increase the liquid flow path, reduce the wetting time, and ensure a more uniform electrolyte distribution throughout the electrode layer. Simultaneously, the grooves increase the actual contact area of ​​the electrode sheets, allowing more active materials to fully contact the electrolyte, thereby improving the battery's charge and discharge efficiency. A larger surface area means more reaction sites, which is beneficial for increasing the battery's energy density and power density. However, existing electrode grooving is a separate process following coating, typically performed directly on dry electrodes using laser or mechanical cutting. This generates dust, posing a risk of short circuits or self-discharge. Furthermore, laser grooving creates a heat-affected zone, which can damage the active materials, while mechanical grooving carries the risk of electrode breakage.

[0004] Therefore, this application aims to provide a coating gasket and a die head to solve the above-mentioned problems. Utility Model Content

[0005] The main purpose of this invention is to provide a coating pad and a die head, which aims to solve the technical problem that in the prior art, electrode sheets are prone to heat-affected zones and dust when grooved by laser or mechanical means, which may damage the electrode material structure and lead to a decrease in battery performance.

[0006] To achieve the above-mentioned utility model objectives, this utility model provides a coating gasket, comprising a gasket body, wherein the gasket body includes a main body portion, a connecting portion, and a thinning region, wherein the two ends of the thinning region are connected to the main body portion through corresponding connecting portions, the thickness of the thinning region is less than the thickness of the connecting portion, and a groove is provided in the thinning region.

[0007] Furthermore, the height of the groove is less than the difference between the thickness of the connecting portion and the thickness of the thinning zone.

[0008] Furthermore, the groove is shaped like an equilateral triangle.

[0009] Furthermore, the connecting part includes a connecting section and a blocking section. The blocking section is connected to the main body through the connecting section, and the two ends of the thinning region are connected to the corresponding connecting sections through the corresponding blocking sections.

[0010] Furthermore, the width of the thinning region is smaller than the width of the blocking segment.

[0011] Furthermore, protrusions are provided at both ends of the main body.

[0012] Furthermore, the coating pad also includes a support strip, one end of which is connected to the main body and the other end of which is connected to the thinning zone.

[0013] Furthermore, the support bars are provided correspondingly to the groove bars.

[0014] Furthermore, the gasket body and the support strip are integrally connected.

[0015] Furthermore, the connecting part and the main body part are provided with mounting through holes.

[0016] In order to achieve the above-mentioned utility model objectives, the present utility model provides a mold head, including an upper mold head, a lower mold head, and a coating pad as described in any one of the above-mentioned embodiments, wherein the coating pad is disposed between the upper mold head and the lower mold head.

[0017] Beneficial effects:

[0018] Compared with the prior art, a coating pad according to an embodiment of this application includes a pad body, which includes a main body portion, a connecting portion, and a thinning region. The two ends of the thinning region are connected to the main body portion through corresponding connecting portions. The thickness of the thinning region is less than the thickness of the connecting portion, and a groove is provided within the thinning region. This technical solution, by setting a thinning region on the coating pad and providing grooves within the thinning region, allows for the direct formation of a groove structure during the wet film coating stage. This not only achieves the same technical effect as existing laser or mechanical grooving processes but also avoids the technical problems of heat-affected zones and dust that easily arise from laser or mechanical grooving, which may damage the electrode material structure and lead to a decrease in battery performance.

[0019] Compared with the prior art, a die head according to an embodiment of this application includes an upper die head, a lower die head, and a coating pad as described in any of the above-mentioned embodiments. It is understood that the die head of this utility model application may include all the technical features and effects of the aforementioned coating pad, which will not be repeated here. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a coated pad according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the thinning region structure according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the thinning zone structure according to another embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the thinning zone structure according to another embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the thinning zone structure according to another embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the thinning zone structure according to another embodiment of the present invention.

[0026] in:

[0027] 1. Coated gasket; 10. Gasket body; 100. Thinning zone; 101. Connecting part; 1010. Connecting section; 1011. Blocking section; 102. Main body; 1020. Mounting through hole; 1021. Protrusion; 1000. Groove; 11. Support bar.

[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," 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. They 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 or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly and specifically defined.

[0031] 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, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] Please see Figures 1 to 6In this embodiment, a coating pad 1 is provided, including: a pad body 10, the pad body 10 including a main body portion 102, a connecting portion 101 and a thinning region 100, the two ends of the thinning region 100 being connected to the main body portion 102 through corresponding connecting portions 101, the thickness of the thinning region 100 being less than the thickness of the connecting portion 101, and a groove 1000 being provided in the thinning region 100.

[0034] In this embodiment, the gasket body 10 is used to support and integrate other functional components, such as the support strip 11 and the connecting portion 101, to ensure that the required shape and structure can be stably formed during the coating process. The main body 102 is the main part of the gasket body 10, providing the foundation and support for the overall structure. The connecting portion 101 is a transition area located between the main body 102 and the thinning zone 100, acting as a bridge to firmly connect the thinning zone 100 to the main body 102. It is understood that connecting portions 101 are provided at both ends of the main body 102. After the main body 102, the connecting portions 101, and the thinning zone 100 are connected, they form an opening. This opening is used to form a flow channel for the coating slurry. During coating, the slurry flows through this opening to the thinning zone 100 and then flows out to perform coating. The thinning zone 100 refers to the portion of the gasket body 10 that is thinner than the main body 102 and the connecting portion 101 after the thinning treatment. It is mainly used to control the coating thickness and to create grooves 1000 within this area to achieve the function of grooving on the electrode. Because the thickness of the thinning zone 100 is less than that of the connecting portion 101, the cross-sectional area of ​​the flow channel decreases when the slurry flows from the connecting portion 101 to the thinning zone 100. Under a fixed pressure, the reduced channel thickness increases fluid resistance, thereby limiting the slurry's flow rate and volume. Therefore, the amount of slurry flowing out per unit time can be more precisely controlled, thus obtaining a wet film of the required thickness. Simultaneously, the grooves 1000 within the thinning zone 100 can form micro-grooves on the electrode during coating, which helps improve the subsequent electrolyte wetting effect. Specifically, the trenches provide additional channels, facilitating faster and more uniform diffusion of the electrolyte into the electrode material. Compared to smooth surfaces, textured surfaces significantly increase the liquid flow path, reduce immersion time, and ensure more uniform electrolyte distribution throughout the electrode layer. Simultaneously, the trenches increase the actual contact area of ​​the electrode, allowing more active material to fully contact the electrolyte, thereby improving the battery's charge and discharge efficiency. A larger surface area means more reaction sites, which is beneficial for increasing the battery's energy density and power density. The groove 1000 is used to groove the wet film during the coating process. The height, width, and shape of the groove 1000 can be designed according to specific needs to achieve trenches of different specifications. As the electrode slurry flows through the thinning zone 100, the groove 1000 leaves continuous and stable grooves on the wet film surface. After drying and curing, these grooves become effective channels for promoting electrolyte penetration, increasing the effective surface area of ​​the electrode material, and thus improving battery performance.

[0035] In the above embodiments, by setting a thinning region 100 on the coating pad 1 and setting grooves 1000 in the thinning region 100, this structure can directly form a groove structure in the wet film stage of coating. This not only achieves the same technical effect as the existing laser or mechanical grooving process, but also avoids the technical problems that laser or mechanical grooving can easily generate heat-affected zones and dust, and may damage the electrode material structure, leading to a decrease in battery performance.

[0036] Please see Figures 1 to 6 In one embodiment, the height of the groove 1000 is less than the difference between the thickness of the connecting portion 101 and the thickness of the thinning region 100.

[0037] It should be noted that the main function of the groove 1000 is to form microgrooves on the surface of the wet film to improve the wetting effect of the subsequent electrolyte. However, in actual use, if the groove 1000 is too high, it will cause the groove 1000 to apply excessive pressure to the wet film, which will damage the electrode material structure and make the slurry prone to overflow.

[0038] To prevent the above-mentioned problems from occurring, in this embodiment, the height of the groove 1000 is less than the difference between the thickness of the connecting portion 101 and the thickness of the thinning region 100, which can ensure that the groove 1000 is in the groove formed by the thinning region 100, and the groove 1000 can achieve stable grooving operation without affecting the wet film.

[0039] Please see Figures 1 to 6 In one embodiment, the groove 1000 is shaped as an equilateral triangle.

[0040] In this embodiment, the shape of the groove 1000 is not limited. For example, the groove 1000 can be as follows: Figure 2 The equilateral triangle structure shown can also be as follows: Figure 3 The rectangular structure shown can also be any other irregular structure, or even any combination of the above structures.

[0041] In the above embodiments, it can be understood that, compared to a rectangular structure, an equilateral triangle has two sloping sides, resulting in a larger area when forming grooves on the electrode sheet. This is more conducive to improving the subsequent wetting effect of the electrolyte, and the equilateral triangle structure is easier to process than an irregular structure. Therefore, in this embodiment, the groove 1000 preferably adopts an equilateral triangle structure.

[0042] Please see Figures 1 to 6In one embodiment, the connecting portion 101 includes a connecting segment 1010 and a blocking segment 1011. The blocking segment 1011 is connected to the main body portion 102 through the connecting segment 1010, and the two ends of the thinning region 100 are connected to the corresponding connecting segment 1010 through the corresponding blocking segment 1011.

[0043] In this embodiment, the connecting segment 1010 acts as a bridge, connecting the blocking segment 1011 to the main body 102, ensuring the integrity of the entire coated pad 1 structure. The blocking segment 1011 is located between the connecting segment 1010 and the thinning zone 100, and is used to limit the excessive flow of the slurry, ensuring that the slurry only flows out within a predetermined area (thinning zone 100), thereby maintaining a clear and stable boundary of the thinning zone 100.

[0044] Please see Figures 1 to 6 In one embodiment, the width of the thinning region 100 is smaller than the width of the blocking segment 1011.

[0045] In this embodiment, the width of the thinning region 100 is smaller than the width of the blocking section 1011, which saves material when preparing the coated pad 1. And as... Figure 1 As shown, reducing the width of the thinning zone 100 makes the overall structure of the coating pad 1 simpler, which can reduce the complexity of the manufacturing process and reduce the overall weight of the coating pad 1, thus facilitating lightweight design.

[0046] Please see Figures 1 to 6 In one embodiment, protrusions 1021 are provided at both ends of the main body 102.

[0047] In this embodiment, the protrusion 1021 provides an operating point during installation, ensuring that the protrusion 1021 can mate with the corresponding groove or positioning hole on the die head or other equipment, ensuring that the coating pad 1 is correctly placed and remains in a fixed position. This helps improve the repeatability accuracy in the production process and reduces quality problems caused by positional deviations.

[0048] Please see Figures 1 to 6 In one embodiment, the coating pad 1 further includes a support strip 11, one end of which is connected to the main body 102 and the other end is connected to the thinning zone 100.

[0049] In this embodiment, one end of the support strip 11 is fixed to the main body 102, and the other end extends into the thinning region 100, providing additional support to the thinning region 100 and enhancing its mechanical strength and stability. It is understood that the thinning region 100 is relatively thin and may be at risk of bending or deformation when subjected to coating pressure. The presence of the support strip 11 not only strengthens the overall integrity of the gasket structure but also helps maintain the consistency and uniformity of the grooves.

[0050] Please see Figures 1 to 6 In one embodiment, the support bar 11 is provided correspondingly to the groove bar 1000 to ensure that the wet film can be uniformly stressed during the coating process.

[0051] In this embodiment, the position of the support bar 11 corresponds to that of the groove bar 1000. Each groove bar 1000 has a support bar 11 to provide direct support, which enhances the overall mechanical strength of the thinning area 100. During the grooving process, when the groove bar 1000 applies pressure to the wet film, the support bar 11 can effectively prevent the thinning area 100 from deforming or being damaged.

[0052] It should be noted that the grooves 1000 within the thinning zone 100 can be evenly or unequally spaced. This embodiment does not limit the arrangement of the grooves 1000. In this embodiment, the grooves 1000 are preferably evenly spaced. Since the positions of the support strips 11 correspond to the grooves 1000 in this embodiment, the support strips 11 are also evenly spaced. They can maintain a fixed distance and positional relationship throughout the coating process, which helps to ensure that the groove depth and shape formed by each groove 1000 on the wet film are consistent, improving the repeatability and reliability of the grooving process.

[0053] Please see Figures 1 to 6 In one embodiment, the gasket body 10 and the support strip 11 are integrally connected.

[0054] In this embodiment, by integrally molding the gasket body 10 and the support strip 11, the connection interface between the two is eliminated, potential weak points are reduced, and the mechanical strength of the entire coating gasket 1 is significantly enhanced, making it less prone to deformation or damage when subjected to coating pressure, thereby ensuring the stability of the process.

[0055] It is understood that, since the gasket body 10 includes a main body 102, a connecting part 101, and a thinning region 100, in the above embodiment, the main body 102, the connecting part 101, the thinning region 100, and the support strip 11 are all integrally formed structures. Preferably, in this embodiment, a stamping process is used to achieve the integral forming of the coated gasket 1.

[0056] Please see Figures 1 to 6 In one embodiment, the connecting portion 101 and the main body portion 102 are provided with mounting through holes 1020.

[0057] In this embodiment, the mounting through-holes 1020 provide a clear mounting position for the coating gasket 1, ensuring accurate alignment with the die head or other equipment components. Quick and reliable fastening can be achieved by passing fasteners such as bolts and pins through these through-holes.

[0058] This utility model also provides a die head, including an upper die head, a lower die head, and a coating pad 1 as described in any one of the above, wherein the coating pad 1 is disposed between the upper die head and the lower die head.

[0059] In this embodiment, the coating pad 1 is disposed between the upper die head and the lower die head, so that a flow channel is formed between the upper die head and the lower die head. The flow channel is used for the flow of slurry. The slurry can flow out through the coating pad 1, thereby coating the substrate to form an electrode sheet.

[0060] This application does not impose specific limitations on the shape, size, or material of the upper and lower mold heads. They can be designed according to the actual application scenario to meet the corresponding functions. For example, the upper and lower mold heads can be square or columnar structures; they can be made of metal materials such as iron, aluminum, or copper, or metal alloys, or non-metallic materials such as plastic or fiber. It should be noted that the upper and lower mold heads can have the same shape or different shapes, but the planes of the upper and lower mold heads that contact the coating gasket 1 must be able to fit together to ensure the sealing of the mold heads.

[0061] The principle of the technical solution provided in this utility model application is as follows:

[0062] The technical solution of this application combines the separate drying and curing electrode grooving process in the prior art with the coating pad 1 into the coating process. By forming the groove structure directly in the wet film coating stage, subsequent drying and curing are sufficient without grooving. This achieves the same and beneficial technical effect as the separate drying and curing electrode grooving process, avoiding the defects of the separate drying and curing electrode grooving process.

[0063] In summary, an embodiment of this application provides a coating pad 1, comprising a pad body 10. The pad body 10 includes a main body portion 102, a connecting portion 101, and a thinning region 100. The two ends of the thinning region 100 are connected to the main body portion 102 via corresponding connecting portions 101. The thickness of the thinning region 100 is less than the thickness of the connecting portion 101. A groove 1000 is provided within the thinning region 100. This technical solution, by providing a thinning region 100 on the coating pad 1 and providing a groove 1000 within the thinning region 100, allows for the direct formation of a groove structure during the wet film coating stage. This not only achieves the same technical effect as existing laser or mechanical grooving processes but also avoids the technical problems of heat-affected zones and dust that are easily generated by laser or mechanical grooving, which may damage the electrode material structure and lead to a decrease in battery performance.

[0064] An embodiment of this application provides a die head including an upper die head, a lower die head, and the coating pad 1 described in any of the preceding claims. It is understood that the die head of this application may include all the technical features and effects of the coating pad 1, which will not be repeated here.

[0065] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A coated gasket characterized by, include: The gasket body includes a main body, a connecting part, and a thinning region. The two ends of the thinning region are connected to the main body through corresponding connecting parts. The thickness of the thinning region is less than the thickness of the connecting part. A groove is provided in the thinning region.

2. The coated gasket of claim 1, wherein, The height of the groove is less than the difference between the thickness of the connecting part and the thickness of the thinning zone.

3. The coated gasket of claim 1, wherein, The groove is shaped like an equilateral triangle.

4. The coated gasket of claim 1, wherein, The connecting part includes a connecting section and a blocking section. The blocking section is connected to the main body through the connecting section, and the two ends of the thinning region are connected to the corresponding connecting sections through the corresponding blocking sections.

5. The coated gasket of claim 4, wherein, The width of the thinning zone is smaller than the width of the blocking section.

6. The coated gasket of claim 1, wherein, The main body has protrusions at both ends.

7. The coated gasket of any one of claims 1 to 6, wherein, It also includes a support strip, one end of which is connected to the main body and the other end of which is connected to the thinning zone.

8. The coated gasket of claim 7, wherein, The support bars are provided correspondingly to the groove bars.

9. The coated gasket of claim 7, wherein, The gasket body and the support strip are integrally connected.

10. The coated gasket of claim 1, wherein, The connecting part and the main body are provided with mounting through holes.

11. A die comprising an upper die and a lower die, characterized in that, It also includes a coating pad as described in any one of claims 1 to 10, the coating pad being disposed between the upper die head and the lower die head.

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