Pole piece edge protection system based on pet film

Abstract

The utility model provides a kind of pole piece edge protection system based on PET film, including pole piece conveying device, first PET film unwinding device, first coating device, first solidification device, first PET film winding device, second PET film unwinding device, second coating device, second solidification device and second PET film winding device;Two horizontal rectangular holes parallel to each other are set on first PET film, and the two horizontal rectangular holes cover the upper and lower edges of pole piece respectively;A plurality of vertical rectangular holes parallel to each other are evenly set on second PET film, and the plurality of vertical rectangular holes cover the cutting area of pole piece respectively.The utility model can effectively prevent the direct contact short circuit of positive and negative pole edges by insulating protection of the four edges of pole piece, and the edge insulation layer can play the role of buffering and stress equalization;Horizontal rectangular hole and vertical rectangular hole have larger interference space, can adapt to different production lines, system structure is simple, and greatly reduces production cost.

Description

Technical Field

[0001] This utility model relates to the field of solid-state battery technology, specifically to an electrode edge protection system based on PET film. Background Technology

[0002] In solid-state batteries, the positive and negative electrodes form a solid-solid interface with the solid electrolyte. Cell assembly often employs a stacking process combined with high-voltage densification to enhance interface contact and reduce interface impedance. However, this structural characteristic and manufacturing process make the electrode edges a critical weak point for cell short circuits, performance degradation, and safety failures. Therefore, electrode edge insulation protection is an indispensable key process in the mass production of solid-state batteries.

[0003] A Chinese patent with publication number CN120637381A discloses a battery electrode, its preparation method, and an all-solid-state lithium-ion battery. The battery electrode includes a current collector, a positive electrode slurry coating coated on both sides of the current collector, a solid electrolyte membrane cured in situ using 3D printing technology in the middle of the positive electrode slurry coating, and an insulating ceramic adhesive coating cured in situ using 3D printing technology in the areas near the outer periphery of the positive electrode slurry coating and near the positive electrode slurry coating on both sides of the electrode tab.

[0004] In existing technologies, the edge insulation protection of solid-state batteries mainly adopts three technical paths: physical isolation, coating, and structural encapsulation. However, most insulation protection solutions cannot achieve full coverage of the electrode edge, and short-circuit risks still exist in the protection blind spots; the coating has weak adhesion to the electrode substrate, is prone to delamination and peeling, and the protection fails after long-term cycling; some processes are complex and cumbersome, have poor compatibility with existing electrode coating and die-cutting production lines, making it difficult to achieve online integrated production and increasing manufacturing costs.

[0005] Therefore, there is a need to provide an electrode edge protection system based on PET film that can solve the above problems. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the purpose of this utility model is to provide an electrode edge protection system based on PET film.

[0007] According to the present invention, an electrode edge protection system based on PET film is provided, comprising: an electrode conveying device, a first PET film unwinding device, a first coating device, a first curing device, a first PET film winding device, a second PET film unwinding device, a second coating device, a second curing device, and a second PET film winding device. The electrode conveying device is provided with electrode sheets, and the first PET film unwinding device, the first coating device, the first curing device, the first PET film winding device, the second PET film unwinding device, the second coating device, the second curing device, and the second PET film winding device are sequentially distributed on the conveying path of the electrode conveying device. The first PET film output from the first PET film unwinding device is laid on the electrode sheet. The first PET film has two horizontal rectangular holes that are parallel to each other. The two horizontal rectangular holes cover the upper and lower edges of the electrode sheet respectively. The insulating ceramic coating is applied to the horizontal rectangular holes of the first PET film through the first coating device. The first PET film is separated from the electrode sheet through the first PET film winding device. The second PET film output from the second PET film unwinding device is laid on the electrode sheet. The second PET film has a plurality of parallel vertical rectangular holes evenly opened on it. The plurality of vertical rectangular holes cover the cutting area of ​​the electrode sheet respectively. The insulating ceramic coating is applied to the vertical rectangular holes of the second PET film through the second coating device. The second PET film is separated from the electrode sheet by the second PET film winding device.

[0008] Preferably, the electrode is strip-shaped, and both sides of the electrode fall completely within the range of the transverse rectangular hole and form an interference fit.

[0009] Preferably, the interference fit of the transverse rectangular hole does not exceed 5 cm.

[0010] Preferably, a plurality of tabs are evenly arranged on the upper side of the electrode sheet, and the area of ​​the tabs covered by the transverse rectangular holes does not exceed 50%.

[0011] Preferably, the height of the vertical rectangular hole matches the height of the electrode sheet.

[0012] Preferably, the coating thickness of the insulating ceramic coating is between 200 nm and 1 μm.

[0013] Preferably, the insulating ceramic coating comprises Al2O3 or an oxide electrolyte.

[0014] Preferably, the device further includes a cutting device, the input end of which is connected to the output end of the electrode conveying device, and the working area of ​​the cutting device is set to correspond to the cutting area of ​​the electrode.

[0015] Preferably, the vertical rectangular hole completely covers the working area of ​​the cutting device, and the interference of the vertical rectangular hole does not exceed 8cm.

[0016] Preferably, the first coating device and the second coating device include a slot coating device, and the first curing device and the second curing device include a photocuring device or a drying device.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention achieves insulation protection for the edges of the electrode sheet by laying and winding the PET film twice, and coating and curing the insulating ceramic coating twice. This effectively prevents direct contact and short circuit between the positive and negative electrode edges, and the edge insulation layer can buffer and equalize stress. The large interference space provided by the horizontal and vertical rectangular holes allows it to be adapted to different production lines. The PET film material is low in cost, and the supporting device has a simple structure and is easy to operate, which can greatly reduce production costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the electrode edge protection system based on PET film of this utility model; Figure 2 This is a schematic diagram of the first PET film of this utility model placed on the electrode sheet; Figure 3 This is a schematic diagram of the second PET film of this utility model placed on the electrode sheet.

[0019] Reference numerals: 1. Electrode conveying device; 2. First PET film unwinding device; 3. First coating device; 4. First curing device; 5. First PET film winding device; 6. Second PET film unwinding device; 7. Second coating device; 8. Second curing device; 9. Second PET film winding device. Detailed Implementation

[0020] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0021] like Figures 1-3As shown, an electrode edge protection system based on PET film according to this utility model includes: an electrode conveying device 1, a first PET film unwinding device 2, a first coating device 3, a first curing device 4, a first PET film winding device 5, a second PET film unwinding device 6, a second coating device 7, a second curing device 8, and a second PET film winding device 9; an electrode is disposed on the electrode conveying device 1, and the first PET film unwinding device 2, the first coating device 3, the first curing device 4, the first PET film winding device 5, the second PET film unwinding device 6, the second coating device 7, the second curing device 8, and the second PET film winding device 9 are sequentially distributed on the conveying path of the electrode conveying device 1; the first PET film unwinding device... The first PET film output from device 2 is laid on the electrode sheet. The first PET film has two horizontal rectangular holes that are parallel to each other and cover the upper and lower edges of the electrode sheet respectively. The insulating ceramic coating is applied to the horizontal rectangular holes of the first PET film through the first coating device 3. The first PET film is separated from the electrode sheet through the first PET film winding device 5. The second PET film output from the second PET film unwinding device 6 is laid on the electrode sheet. The second PET film has multiple parallel vertical rectangular holes that are evenly opened and cover the area of ​​the electrode sheet to be cut. The insulating ceramic coating is applied to the vertical rectangular holes of the second PET film through the second coating device 7. The second PET film is separated from the electrode sheet through the second PET film winding device 9.

[0022] In solid-state batteries, insulating the edges of the electrodes is a key safety and process measure. It can effectively prevent direct contact and short circuit between the positive and negative electrode edges, and the edge insulation layer can also buffer and equalize stress.

[0023] In actual production, the electrode edge protection system of this application is generally installed before the electrode cutting process. The electrode edge protection system is connected to the cutting device, the input end of the cutting device is connected to the output end of the electrode conveying device 1, and the working area of ​​the cutting device is set to correspond to the cutting area of ​​the electrode.

[0024] Generally, the electrode sheet is strip-shaped before cutting. Multiple tabs are evenly distributed on the upper side of the electrode sheet, with no more than 50% of the tabs covered by the horizontal rectangular holes. Both sides of the electrode sheet fall completely within the horizontal rectangular holes, forming an interference fit, with the interference of the horizontal rectangular holes not exceeding 5cm. The height of the vertical rectangular holes matches the height of the electrode sheet. The vertical rectangular holes completely cover the working area of ​​the cutting device, with the interference of the vertical rectangular holes not exceeding 8cm.

[0025] Furthermore, the insulating ceramic coating of this application includes Al2O3 or oxide electrolyte. The coating thickness of the insulating ceramic coating is between 200 nm and 1 μm. The insulating ceramic coating has excellent and stable insulation properties, does not decompose or conduct electricity at high temperatures and high potentials, is more stable than polymers, has high mechanical strength, is puncture-resistant, stress-resistant, and has high hardness, and can "passivate" the edges of the electrode.

[0026] Preferably, the first coating device 3 and the second coating device 7 are slit coating devices, which generally employ a precision coating die, a feeding structure, a back roller, and a tension control structure. This coating device has controllable coating thickness and advantages such as high precision and good uniformity.

[0027] Preferably, the first curing device 4 and the second curing device 8 are photocuring devices or drying devices, which can quickly fix the coating without affecting the quality of the electrode sheet.

[0028] In use, the electrode conveying device 1 outputs the electrode sheet, and the first PET film output from the first PET film unwinding device 2 is laid on the electrode sheet. During this process, a correction device or positioning device can be used to ensure that the two transverse rectangular holes of the first PET film cover the upper and lower edges of the electrode sheet, respectively, while not completely covering the electrode tabs. Furthermore, a guide device or pressure roller can be used to ensure that the first PET film and the electrode sheet are completely bonded, preventing the insulating ceramic coating from overflowing in subsequent processes. After the first PET film and the electrode sheet are bonded, the insulating ceramic coating is applied to the transverse rectangular holes of the first PET film by the first coating device 3, so that the insulating ceramic coating completely covers the upper and lower edges of the electrode sheet and the lower half of the electrode tabs. Then, the insulating ceramic coating is cured by the first curing device 4, and the first PET film is separated from the electrode sheet by the first PET film winding device 5. This process completes the protection of the upper and lower edges of the electrode sheet.

[0029] Next, the second PET film output from the second PET film unwinding device 6 is laid onto the electrode sheet. During this process, a correction device or positioning device can be used to ensure that the vertical rectangular holes of the second PET film correspond to and cover the area to be cut on the electrode sheet. Furthermore, a guide device or pressure roller can be used to ensure complete adhesion between the second PET film and the electrode sheet, preventing the insulating ceramic coating from overflowing in subsequent processes. After the second PET film and electrode sheet are adhered, the insulating ceramic coating is applied to the vertical rectangular holes of the second PET film using the second coating device 7, ensuring that the insulating ceramic coating completely covers the area to be cut. Then, the insulating ceramic coating is cured using the second curing device 8, and finally, the second PET film is separated from the electrode sheet using the second PET film winding device 9. This process completes the protection of the left and right edges of the electrode sheet.

[0030] Finally, the electrode sheet that has undergone two edge protection processes is conveyed to the cutting device. The working area of ​​the cutting device corresponds to the cutting area of ​​the electrode sheet. The cutting device cuts the strip-shaped electrode sheet into individual electrode sheet units, which are then sent to the next process.

[0031] This application achieves insulation protection for the edges of the electrode sheet through two PET film laying and winding processes, and two coating and curing processes of insulating ceramic coating. This effectively prevents direct contact and short circuits between the positive and negative electrode edges, and the edge insulation layer also acts as a buffer and equalizes stress. The horizontal and vertical rectangular holes of the PET film-based electrode edge protection system in this application have large interference fits, making it adaptable to different production lines. The PET film material is low-cost, and the supporting equipment has a simple structure and is easy to operate, which can greatly reduce production costs.

[0032] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An electrode edge protection system based on PET film, characterized in that, include: Electrode conveying device (1), first PET film unwinding device (2), first coating device (3), first curing device (4), first PET film winding device (5), second PET film unwinding device (6), second coating device (7), second curing device (8), and second PET film winding device (9); The electrode conveying device (1) is provided with electrode sheets, and the first PET film unwinding device (2), the first coating device (3), the first curing device (4), the first PET film winding device (5), the second PET film unwinding device (6), the second coating device (7), the second curing device (8), and the second PET film winding device (9) are sequentially distributed on the conveying path of the electrode conveying device (1). The first PET film output by the first PET film unwinding device (2) is laid on the electrode sheet. The first PET film has two horizontal rectangular holes that are parallel to each other. The two horizontal rectangular holes cover the upper and lower edges of the electrode sheet respectively. The insulating ceramic coating is applied to the horizontal rectangular holes of the first PET film by the first coating device (3). The first PET film is separated from the electrode sheet by the first PET film winding device (5). The second PET film output by the second PET film unwinding device (6) is laid on the electrode sheet. The second PET film has a plurality of parallel vertical rectangular holes evenly opened on it. The plurality of vertical rectangular holes cover the area to be cut of the electrode sheet respectively. The insulating ceramic coating is applied to the vertical rectangular holes of the second PET film by the second coating device (7). The second PET film is separated from the electrode sheet by the second PET film winding device (9).

2. The electrode edge protection system based on PET film as described in claim 1, characterized in that, The electrode is strip-shaped, and both sides of the electrode fall completely within the range of the horizontal rectangular hole, forming an interference fit.

3. The electrode edge protection system based on PET film as described in claim 2, characterized in that, The interference fit of the transverse rectangular hole shall not exceed 5 cm.

4. The electrode edge protection system based on PET film as described in claim 2, characterized in that, Multiple tabs are evenly arranged on the upper side of the electrode sheet, and the area of ​​the tabs covered by the horizontal rectangular holes does not exceed 50%.

5. The electrode edge protection system based on PET film as described in claim 2, characterized in that, The height of the vertical rectangular hole matches the height of the electrode.

6. The electrode edge protection system based on PET film as described in claim 1, characterized in that, The thickness of the insulating ceramic coating is between 200 nm and 1 μm.

7. The electrode edge protection system based on PET film as described in claim 1, characterized in that, The insulating ceramic coating includes Al2O3 or oxide electrolyte.

8. The electrode edge protection system based on PET film as described in claim 1, characterized in that, It also includes a cutting device, the input end of which is connected to the output end of the electrode conveying device (1), and the working area of ​​the cutting device is set to correspond to the cutting area of ​​the electrode.

9. The electrode edge protection system based on PET film as described in claim 8, characterized in that, The vertical rectangular hole completely covers the working area of ​​the cutting device, and the interference of the vertical rectangular hole does not exceed 8cm.

10. The electrode edge protection system based on PET film as described in claim 1, characterized in that, The first coating device (3) and the second coating device (7) include a slot coating device, and the first curing device (4) and the second curing device (8) include a light curing device or a drying device.

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