Electrode leading-out structure for electric heating windshield glass and preparation method of electrode leading-out structure
By setting conductive sheets and bonding layers on the electrode surface of electrically heated windshield glass, and using conductive paste for heating and curing connection, the problems of unstable connection between electrodes and external wires and glass deformation caused by welding are solved, achieving a stable and reliable electrical connection.
Patent Information
- Application Number
- CN202511228257.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-29
- Publication Date
- 2025-12-12
AI Technical Summary
The existing method of connecting the electrodes of electrically heated windshields to external wires presents challenges in construction, such as poor contact and safety hazards. Furthermore, the welding method may lead to glass deformation or poor conductivity.
The structure employs a conductive sheet and a bonding layer. A conductive sheet is placed on the electrode surface and a bonding layer is prepared on one side thereon. A conductive paste is used to heat and cure the electrode to connect the bonding layer. The bonding layer is compatible with the electrode material, which reduces the connection temperature and improves stability.
This achieves a stable connection between the electrode and the external wire, reduces safety hazards, lowers the risk of glass deformation, and improves the reliability and conductivity of the connection.
Smart Images
Figure CN121126592A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of electrically heated windshield, in particular to an electrode lead-out structure for electrically heated windshield and a preparation method thereof. BACKGROUND
[0002] Large passenger aircraft, transport aircraft, helicopters and other aircraft need to arrange conductive film for electric heating, and then realize the functions of anti-fog and anti-icing. The electric heating system usually arranges electrodes (bus bars) at the edge of the conductive film, and then connects the bus bars with wires to realize the connection with the power supply on the aircraft, and provides power through the power supply on the aircraft to realize the function of electric heating.
[0003] The setting of the electrode of the electric heating system usually adopts the scheme of conductive silver paste, that is, the edge of the heating film is coated with conductive silver paste and heated and solidified. The conductive silver paste has good adhesion with the conductive film after solidification and has extremely small resistance, which can effectively ensure that the distribution of current and voltage on the heating film is not affected by the resistance of the electrode. After the silver paste electrode is solidified, it needs to be effectively connected with the wire.
[0004] At present, the connection is mainly achieved by physical lapping or conductive adhesive bonding of the wire and the silver paste electrode. The electrode is led out by the relative stability of the wire and the electrode structure after lamination. However, this structure has a large practical construction difficulty, and the contact between the silver paste electrode and the wire is easily affected by stress, and then phenomena such as arc and sparking occur, which affects the safety of glass heating and flight. In addition, although the connection can be achieved by direct welding, the wire is directly welded to the surface of the silver paste electrode, and the reliability is high. On the one hand, for organic glass, even if low-temperature welding is selected, the temperature is usually above 138℃, and the local temperature can reach above 150℃. This temperature will cause deformation of the organic glass (PMMA), affect the electrical connection, and on the other hand, for inorganic glass, a special silver paste material with affinity to solder and capable of direct welding is needed. The silver paste material that meets the welding requirements may have poor conductivity, poor adhesion to the substrate, or a solidification temperature higher than the softening temperature of the inorganic glass, which will also adversely affect the overall performance of the glass, electrode and other electric heating. SUMMARY
[0005] In view of the problems in the background art, the present application provides an electrode lead-out structure for electrically heated windshield and a preparation method thereof, which can improve the connection stability of the electrode and the external wire, reduce safety hazards, and realize stable connection of the electrode and the external wire.
[0006] According to one aspect of the present invention, an electrode lead-out structure for electrically heated windshield glass is provided, comprising: a glass substrate, wherein a heating film is disposed on the surface of the glass substrate and an electrode is disposed on the surface of the heating film; a conductive sheet, wherein the conductive sheet is disposed on the surface of the electrode and a bonding layer is disposed on the side of the conductive sheet facing the electrode according to the material of the electrode; and a conductive paste, wherein the conductive paste is coated between the electrode and the bonding layer, and the conductive paste is heat-cured to bond with the electrode and the bonding layer.
[0007] In some embodiments of the present invention, the bonding layer is a silver plating layer, the electrode is a silver paste-cured electrode, and the conductive paste is a conductive silver paste.
[0008] In some embodiments of the present invention, the coating thickness of the conductive silver paste between the electrode and the bonding layer is 0.02 to 0.04 mm.
[0009] In some embodiments of the present invention, the conductive sheet has leads pre-welded to the side opposite to the bonding layer.
[0010] In some embodiments of the present invention, the lead wire includes a conductive copper strip, one end of which is connected to the conductive sheet by solder.
[0011] According to another aspect of the present invention, a method for preparing the above-mentioned electrode lead-out structure for electrically heated windshield glass is provided, comprising the following steps: preparing a glass substrate, wherein a heating film is provided on the surface of the glass substrate and an electrode is provided on the surface of the heating film; preparing a conductive sheet, wherein a bonding layer is formed on one side of the conductive sheet according to the material of the electrode; preparing a conductive paste according to the materials of the electrode and the bonding layer, applying the conductive paste to the connection area on the surface of the electrode, and contacting the side of the conductive sheet with the bonding layer with the conductive paste; and heating and curing the conductive paste to fix the electrode and the bonding layer together through the conductive paste.
[0012] In some embodiments of the present invention, the electrode surface is polished in the connection area between the application of conductive paste.
[0013] In some embodiments of the present invention, the sandpaper used for polishing is 4500 to 5500 grit.
[0014] In some embodiments of the present invention, the electrode surface is protected by adhesive tape, at least near the connection area, before the electrode surface is polished.
[0015] In some embodiments of the present invention, after the side of the conductive sheet with the bonding layer is brought into contact with the conductive paste, the conductive sheet is temporarily fixed to the glass substrate with tape, and then heated and cured.
[0016] Compared with the prior art, the present invention achieves the following technical effects:
[0017] 1. This invention uses solder to pre-impregnate the leads, which improves the conductivity and connection stability between the leads and other structural copper sheets.
[0018] 2. This invention innovatively adds a single-sided silver-plated copper sheet, which has excellent affinity with solder and adhesion to silver paste, effectively improving the structural stability of the electrode lead-out.
[0019] 3. The process of this invention is reasonable and highly operable. The pre-impregnation of the leads and the welding process with the copper sheet do not involve the glass substrate and electrodes, which improves the fault tolerance of the process implementation. The bonding process between the copper sheet and the electrode is simple and effective, and will hardly cause the parts to be scrapped.
[0020] 4. In the process of connecting the electrode and the lead wire, the present invention uses silver paste to cure the electrode and the material, which eliminates the limitations of welding on material affinity, temperature, etc. Attached Figure Description
[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0022] Figure 1 This is a schematic diagram of the overall structure of the electrode lead-out structure of the present invention;
[0023] Figure 2 This is a flowchart illustrating the fabrication process of the electrode lead-out structure of this invention;
[0024] Figure 3 This is a flowchart illustrating the fabrication process of an electrode lead-out structure according to an embodiment of the present invention.
[0025] The reference numerals in the attached diagram represent the following: 1. Glass substrate; 2. Conductive sheet; 3. Conductive paste; 4. Heating film; 5. Electrode; 6. Bonding layer; 7. Lead wire; 8. Solder. Detailed Implementation
[0026] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.
[0027] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0028] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.
[0029] This application discloses an electrode lead-out structure for electrically heated windshields. For example... Figure 1 As shown, the electrode lead-out structure for electrically heated windshield glass includes a glass substrate 1, a conductive sheet 2, and a conductive paste 3; wherein, a heating film 4 is provided on the surface of the glass substrate 1, and an electrode 5 is provided on the surface of the heating film 4; the conductive sheet 2 is provided on the surface of the electrode 5, and a bonding layer 6 is provided on the side of the conductive sheet 2 facing the electrode 5 according to the material of the electrode 5; the conductive paste 3 is applied between the electrode 5 and the bonding layer 6, and the conductive paste 3 can bond with the electrode 5 and the bonding layer 6 after being heated and cured.
[0030] This invention provides a conductive sheet 2 on the surface of electrode 5 and a bonding layer 6 on the side of the conductive sheet 2 facing electrode 5. Based on the compatibility between the bonding layer 6 and the electrode 5 material, a conductive paste 3 is applied between them and cured by heating to bond the electrode 5 and the bonding layer 6. That is, the electrode 5 is connected to the external wire through the cured conductive paste 3, the bonding layer 6, and the conductive sheet 2. Compared with the currently used physical overlapping or conductive adhesive bonding methods, this invention can effectively ensure and improve the connection stability between electrode 5 and external wire, reduce safety hazards, and compared with the method of directly welding external wire to electrode, the use of conductive paste 3 that is compatible with the bonding layer 6 and electrode 5 material and the connection by heating to cure the connection greatly reduces the working temperature, effectively reduces the deformation that may be caused to organic glass or inorganic glass, ensures the stability of electrical connection, and achieves a stable connection between electrode 5 and external wire.
[0031] In some embodiments of the present invention, the bonding layer 6 is a silver plating layer, the electrode 5 is a silver paste cured electrode, and the conductive paste 3 is a conductive silver paste.
[0032] In this embodiment, by plating silver on one side of the conductive sheet 2 and connecting the conductive sheet 2 to the silver paste curing electrode using conductive silver paste, it not only has excellent conductivity and high conductivity efficiency, but also has good silver layer adhesion and is not easy to fall off during processing. At the same time, the conductive silver paste has a low heating curing temperature, which greatly reduces the impact on the plexiglass when connecting the silver-plated conductive sheet 2 to the silver paste curing electrode.
[0033] Specifically, in this embodiment, the heating and curing temperature of the conductive silver paste can be as low as 88°C, and the curing time is 2 hours, which can stably connect the silver-plated conductive sheet 2 with the silver paste curing electrode.
[0034] Furthermore, the conductive sheet 2 can be made of copper sheet, which has good adhesion to silver paste, and can further improve the connection stability with electrode 5, which is beneficial to improving the structural stability of electrode 5.
[0035] It should be noted that in other embodiments of the present invention, depending on the material of the glass substrate 1, such as organic glass or inorganic glass, the materials of the conductive sheet 2, bonding layer 6, conductive silver paste and electrode 5 can be selected to ensure that the conductive sheet 2, bonding layer 6, conductive silver paste and electrode 5 have good electrical connection stability as a whole while reducing the impact on the glass substrate 1.
[0036] In some embodiments of the present invention, the coating thickness of the conductive silver paste between the electrode 5 and the bonding layer 6 is not particularly limited. Those skilled in the art can make a reasonable selection according to actual needs. As some specific examples, preferably, the coating thickness of the conductive silver paste between the electrode 5 and the bonding layer 6 is 0.02 to 0.04 mm. For example, the coating thickness of the conductive silver paste can be 0.02 mm, 0.03 mm, or 0.04 mm, etc.
[0037] In some embodiments of the present invention, such as Figure 1 As shown, the conductive sheet 2 has a lead wire 7 pre-welded to the side opposite to the bonding layer 6.
[0038] In this embodiment, by pre-welding a lead 7 (i.e., an external wire) to the side of the conductive sheet 2 away from the bonding layer 6, and then connecting the conductive sheet 2 to the electrode 5, the conductive sheet 2 and the lead 7 can be stably fixed together while ensuring a stable connection between the conductive sheet 2 and the electrode 5.
[0039] Specifically, in this embodiment, the lead wire 7 includes a conductive copper strip (flat structure), one end of which is connected to the conductive sheet 2 via solder 8. The conductive sheet 2 is preferably made of copper.
[0040] The copper sheet has excellent affinity with solder 8. Through solder 8, the copper sheet can be stably connected to the conductive copper charge, which is beneficial to further improve the structural stability of electrode 5.
[0041] In some embodiments of the present invention, the conductive copper strip can be pre-dipped in solder, and then the conductive copper strip can be soldered to the copper sheet to ensure that the lead wire 7 in the cross section is completely wetted by solder, so as to improve its conductivity when connected to other cross sections.
[0042] In some embodiments of the present invention, for copper sheets, single-sided silver-plated copper sheets can be cut or stamped according to the required size of the connecting surface, and the single-sided silver-plated copper sheets can be leveled using a plate leveling machine or other similar equipment. The pre-impregnated tin-plated copper strips can be soldered to the non-silver-plated surface of the copper sheet using solder 8 to ensure that the solder joints are flat and smooth.
[0043] This application also discloses a method for preparing the above-mentioned electrode lead-out structure for electrically heated windshield glass, such as... Figure 2 and Figure 3 As shown, the preparation method includes the following steps:
[0044] S1. Prepare a glass substrate. A heating film is provided on the surface of the glass substrate, and electrodes are provided on the surface of the heating film.
[0045] S2. Prepare a conductive sheet by forming a bonding layer on one side of the conductive sheet according to the material of the electrode.
[0046] S3. Prepare conductive paste according to the materials of the electrode and bonding layer. Apply the conductive paste to the connection area on the electrode surface and bring the side of the conductive sheet with the bonding layer into contact with the conductive paste.
[0047] S4. The conductive paste is heated and cured to fix the electrode and bonding layer together.
[0048] In some embodiments of the present invention, the connection area of the electrode surface is polished between the application of conductive paste to eliminate the oxide layer that may be generated on the electrode surface and reduce the impact on the electrical connection between the conductive sheet and the electrode.
[0049] In some embodiments of the present invention, the grit of the sandpaper used for polishing is not particularly limited, and those skilled in the art can make a reasonable selection according to actual needs. As some specific examples, the sandpaper used for polishing can be 4500 to 5500 grit, and preferably, the sandpaper used for polishing is 5000 grit.
[0050] In some embodiments of the present invention, the electrode surface is protected by applying adhesive tape to at least the electrode surface near the connection area before polishing.
[0051] In this embodiment, according to the size of the conductive sheet, the non-connection area of the electrode surface is protected by applying tape. This not only avoids wear on other areas of the electrode during polishing and preserves the oxide layer, but also allows conductive paste to be applied within the tape's coverage area based on the tape's thickness. The paste is then smoothed with a scraper, ensuring that the edges of the tape in the bonding area are not covered by the conductive paste. The thickness of the tape ensures the thickness and uniformity of the applied conductive paste.
[0052] In some embodiments of the present invention, the thickness of the protective tape is not particularly limited, and those skilled in the art can make a reasonable selection according to actual needs. As some specific examples, preferably, the thickness of the protective tape can be 0.02mm to 0.04mm, for example, the thickness of the protective tape can be 0.02mm, 0.03mm or 0.04mm, etc.
[0053] In some embodiments of the present invention, after the side of the conductive sheet with the bonding layer comes into contact with the conductive paste, the conductive sheet is temporarily fixed to the glass substrate with tape, and then the conductive paste is heated and cured according to the curing temperature and time to ensure accurate positioning of the conductive sheet and the electrode, avoid positional deviation of the conductive sheet during the heating and curing process, and make the conductive sheet and the electrode firmly fixed.
[0054] After the conductive paste has cured, remove the fixing tape and the tape used to protect other parts to complete the stable connection between the silver paste cured electrode and the external wire.
[0055] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. An electrode lead-out structure for electrically heated windshield glass, characterized in that, include: A glass substrate, wherein a heating film is provided on the surface of the glass substrate, and electrodes are provided on the surface of the heating film; A conductive sheet is disposed on the surface of the electrode, and the conductive sheet has a bonding layer on the side facing the electrode according to the material of the electrode; A conductive paste is applied between the electrode and the bonding layer, and the conductive paste can bond with the electrode and the bonding layer after being heated and cured.
2. The electrode lead-out structure for electrically heated windshield glass according to claim 1, characterized in that, The bonding layer is a silver plating layer, the electrode is a silver paste-cured electrode, and the conductive paste is a conductive silver paste.
3. The electrode lead-out structure for electrically heated windshield glass according to claim 2, characterized in that, The thickness of the conductive silver paste coating between the electrode and the bonding layer is 0.02 to 0.04 mm.
4. The electrode lead-out structure for electrically heated windshield glass according to claim 1, characterized in that, The conductive sheet has leads pre-welded to the side opposite to the bonding layer.
5. The electrode lead-out structure for electrically heated windshield glass according to claim 4, characterized in that, The lead wire includes a conductive copper strip, one end of which is connected to the conductive sheet by solder.
6. A method for preparing an electrode lead-out structure for electrically heated windshield glass as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Prepare a glass substrate, the surface of which is provided with a heating film, and the surface of the heating film is provided with electrodes; A conductive sheet is prepared, and a bonding layer is formed on one side of the conductive sheet according to the material of the electrode; Prepare conductive paste according to the materials of the electrode and bonding layer, apply the conductive paste to the connection area on the electrode surface, and contact the side of the conductive sheet with the bonding layer with the conductive paste. The conductive paste is heated and cured to fix the electrodes and bonding layer together.
7. The preparation method according to claim 6, characterized in that, Between the application of conductive paste, the connection area of the electrode surface is polished.
8. The preparation method according to claim 7, characterized in that, The sandpaper used for polishing is 4500-5500 grit.
9. The preparation method according to claim 7, characterized in that, Before the electrode surface is polished, tape is applied to protect at least the electrode surface near the connection area.
10. The preparation method according to claim 6, characterized in that, After the conductive sheet with the bonding layer is brought into contact with the conductive paste, the conductive sheet is temporarily fixed to the glass substrate with tape, and then cured by heating.