Heatable interlayer structure
By using a heating busbar with a comb-shaped bus belt structure in the coated heating glass, the problem of large contact resistance between the metal conductive strip and the conductive film layer is solved, heating uniformity and cost reduction are achieved, and the generation of bubbles and local hot spots are avoided.
Patent Information
- Application Number
- CN202422437299.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-10-09
AI Technical Summary
The contact resistance between the metal conductive tape and the conductive film layer in the existing coated heated glass is large, resulting in uneven heating and increasing cost, and is prone to bubbles and affecting the appearance.
The heating busbar with a comb-shaped bus belt structure is adopted to reduce the area of the bus belt, and the covering area between the first and second comb-shaped bus belts and the conductive film layer is avoided, and the heating uniformity is improved through the comb-shaped design.
It achieves a more uniform heating, reduces material consumption and cost, while avoiding the occurrence of local hot spots and improving appearance quality.
Smart Images
Figure CN223285961U_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of electric heating of sandwich structures, in particular to a heatable sandwich structure. Background Art
[0002] In cold weather, when there is a large temperature difference between inside and outside, or when the humidity is high, frost or fog is likely to form on the glass surface, affecting vision. Currently, the coated glass is mostly designed with a sandwich structure, and an electric heating structure is set within the sandwich structure to achieve heating of the glass, thereby achieving defrosting and defogging. The coated heated glass currently on the market is mainly achieved by arranging conductive electrodes and busbars at the film layer position to form a conductive layer system for electrical heating. Then a single piece of glass is bonded to another single piece of glass window through a transparent plastic such as polyvinyl butyral (PVB), and a conductive film layer is set on one of the layers of glass. If you want to achieve current and voltage control, you must set a heating busbar on the conductive film layer of the glass, and then connect it to the external power supply through the positive and negative connectors.
[0003] The heating busbar generally includes a metal conductive strip. When the metal conductive strip is directly placed on the conductive film layer, a large contact resistance will be generated between the metal conductive strip and the conductive film layer. In order to reduce the contact resistance between the metal conductive strip and the conductive film layer, a silver paste strip is generally placed on the conductive film layer first, and then the metal conductive strip is placed on the silver paste strip. Generally, the width of the silver paste strip is required to be greater than the width of the metal conductive strip. Due to the large area of the silver paste strip, on the one hand, it will cause an increase in cost. On the other hand, the large area of the silver paste strip is prone to cause bubbles to appear on the contact surface, generating local hot spots, resulting in uneven heating and affecting the appearance. Utility Model Content
[0004] In order to solve the above problems of the prior art, the utility model aims to provide a heatable sandwich structure with a comb-tooth structure heating busbar, so as to avoid the generation of bubbles at the location where the heating busbar is set in the heatable sandwich structure, make the heating more uniform, and help reduce costs.
[0005] The present invention provides a heatable sandwich structure, comprising a first substrate, an intermediate layer, and a second substrate bonded in sequence;
[0006] Also included between the first substrate and the intermediate layer is a conductive film layer formed on the first substrate and a heating busbar formed on the conductive film layer;
[0007] The heating busbars include a first heating busbar and a second heating busbar, wherein the first heating busbar is close to one edge of the conductive film layer, and the second heating busbar is arranged opposite to the first heating busbar and close to the other edge of the conductive film layer;
[0008] The first heating busbar includes a first comb-shaped busbar and a first metal conductive strip, and the second heating busbar includes a second comb-shaped busbar and a second metal conductive strip, wherein the first tooth-shaped busbar on the first comb-shaped busbar and the second tooth-shaped busbar on the second comb-shaped busbar extend in a direction approaching each other;
[0009] The first substrate includes coated glass, PET film, PET plate or organic glass plate, and the second substrate includes coated glass, PET film, PET plate or organic glass plate.
[0010] Preferably, the direction parallel to the first toothed busbar is the first direction, the end of the first toothed busbar exceeds the width covered by the first metal conductive strip in the first direction, and the end of the second toothed busbar exceeds the width covered by the second metal conductive strip in the first direction.
[0011] Preferably, the length of the first toothed busbar exceeding the first metal conductive strip is 1 to 10 mm, and the length of the second toothed busbar exceeding the second metal conductive strip is 1 to 10 mm.
[0012] Preferably, the distance between adjacent first racks in the first tooth-shaped busbar is less than or equal to 200 mm, and the distance between adjacent second racks in the second tooth-shaped busbar is less than or equal to 200 mm.
[0013] Preferably, the thickness of the first comb-shaped bus ribbon and the second comb-shaped bus ribbon is 5-35 μm.
[0014] Preferably, the plurality of first racks have the same length, the plurality of second racks have the same length, and the first racks are arranged opposite to the second racks in the first direction.
[0015] Preferably, the first racks have the same length, the second racks have the same length, and the first racks are staggered with the second racks in the first direction.
[0016] Preferably, the direction perpendicular to the first direction is the second direction, and in the second direction the length of the first rack gradually increases from both sides to the middle, and in the second direction the length of the second rack gradually increases from both sides to the middle.
[0017] Preferably, the lengths of adjacent first racks are different, and the lengths of intermediate first racks are the same; the lengths of adjacent second racks are different, and the lengths of intermediate second racks are the same.
[0018] Preferably, the first tooth bus bar includes multiple groups of first tooth groups, and the first racks of each group of first tooth groups gradually grow from both ends to the middle along the second direction; the second tooth bus bar includes multiple groups of second tooth groups, and the second racks of each group of second tooth groups gradually grow from both ends to the middle along the second direction.
[0019] By providing a comb-shaped first and second comb-shaped busbars, the present invention reduces the area of the busbars compared to the strip-shaped busbars in the prior art. This reduces the contact area between the first comb-shaped busbar and the conductive film layer, the first comb-shaped busbar and the first metal conductive strip, the second comb-shaped busbar and the conductive film layer, and the second comb-shaped busbar and the second metal conductive strip. This prevents the formation of bubbles at the contact points, thereby avoiding the generation of local hot spots and achieving more uniform heating. Furthermore, the reduced area of the busbars also helps reduce material consumption and costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 is a schematic cross-sectional view of the heatable sandwich structure at the first main bus bar along the second direction;
[0021] Figure 2 Schematic diagram of the heatable sandwich structure of Example 1;
[0022] Figure 3 Schematic diagram of the heatable sandwich structure of Example 2;
[0023] Figure 4 Schematic diagram of the heatable interlayer structure of Example 3;
[0024] Figure 5 Schematic diagram of the heatable interlayer structure of Example 4;
[0025] Figure 6 Schematic diagram of the heatable interlayer structure of Example 5;
[0026] The reference numerals in the figure are: 10, first substrate; 20, intermediate layer; 30, second substrate; 40, conductive film layer; 50, heating busbar; 51, first heating busbar; 52, second heating busbar; 511, first metal conductive strip; 512, second comb-shaped busbar; 513, first main busbar; 514, first tooth-shaped busbar; 521, second metal conductive strip; 522, second comb-shaped busbar; 523, second main busbar; 524, second tooth-shaped busbar. DETAILED DESCRIPTION
[0027] The utility model provides a heatable sandwich structure, such as Figure 1As shown, the sandwich structure includes a first substrate 10, an intermediate layer 20, and a second substrate 30 bonded in sequence, and between the first substrate 10 and the intermediate layer 20, a conductive film layer 40 formed on the first substrate 10 and a heating busbar 50 formed on the conductive film layer 40; Figure 2 As shown, the heating bus 50 includes a first heating bus 51 and a second heating bus 52, wherein the first heating bus 51 is close to one edge of the conductive film layer 40, and the second heating bus 52 is arranged opposite to the first heating bus 51 and close to the other edge of the conductive film layer 40.
[0028] Specifically, refer to Figure 2 As shown, the first heating busbar 51 and the second heating busbar 52 are arranged opposite to each other in a first direction as positive and negative electrodes.
[0029] Specifically, the conductive film layer is one or a combination of online Low-E, offline Low-E, offline silver-free Low-E or graphene film.
[0030] Specifically, refer to Figure 2 As shown, a film-free area is provided outside the conductive film layer 40, surrounding the edges of the first substrate 10. The width of the film-free area is 5 to 30 mm, preferably 10 to 20 mm. The heating busbars 50 are entirely located within the coverage of the conductive film layer 40. The intermediate layer 20 can be made of PVB, SGP, EVA, or PU, and can also be configured as a thermochromic layer.
[0031] The first heating busbar 51 includes a first comb-shaped busbar 512 and a first metal conductive strip 511, and the second heating busbar 52 includes a second comb-shaped busbar 512 and a second metal conductive strip 511. The first tooth busbar 514 of the first comb-shaped busbar and the second tooth busbar 524 of the second comb-shaped busbar extend in a first direction toward each other.
[0032] Specifically, refer to Figure 2 As shown, the first comb-shaped busbar 512 includes a first main busbar 513 extending along the second direction and a first tooth busbar 514 extending along the first direction. The first tooth busbar 514 is connected to a side of the first main busbar 513 that is relatively close to the second heating busbar 52, and a plurality of first tooth bars of the first tooth busbar 514 extend in a direction close to the second heating busbar 52. The first direction is perpendicular to the second direction.
[0033] refer to Figure 2As shown, the second comb-shaped busbar 522 includes a second main busbar 523 extending along the second direction and a second tooth busbar 524 extending along the first direction, the second tooth busbar 524 is connected to the side of the second main busbar 523 relatively close to the first heating busbar 51, and the multiple second racks of the second tooth busbar 524 extend in the direction close to the first heating busbar 51.
[0034] The lengths of the plurality of first racks may be the same or different, and the lengths of the plurality of second racks may be the same or different.
[0035] Specifically, the first metal conductive tape 511 and the second metal conductive tape 521 are copper foil, tinned copper foil, aluminum foil or tinned aluminum foil with conductive glue. The thickness of the first metal conductive tape 511 and the second metal conductive tape 521 is 0.02 to 0.1 mm. In order to ensure the toughness of the metal conductive tape and prevent breakage during operation, while reducing the thickness and reducing bubbles, the thickness of the first metal conductive tape 511 and the second metal conductive tape 521 is preferably 0.04 to 0.06 mm.
[0036] Specifically, the first comb-shaped bus strip 512 and the second comb-shaped bus strip 522 are made by screen printing and / or digital printing technology. The raw materials of the first comb-shaped bus strip 512 and the second comb-shaped bus strip 522 include one or two of silver, aluminum or copper. The raw materials are prepared into printing paste, and then printed on the conductive film layer 40 by screen printing and / or digital printing technology, and then dried at 120~280℃ to form the first comb-shaped bus strip 512 and the second comb-shaped bus strip 522.
[0037] The first substrate includes coated glass, PET film, PET plate or organic glass plate, and the second substrate includes coated glass, PET film, PET plate or organic glass plate.
[0038] In a preferred embodiment of the present invention, reference Figure 2 As shown, the end of the first tooth bus bar 514 exceeds the width covered by the first metal conductive strip 511 in the first direction, and the end of the second tooth bus bar 524 exceeds the width covered by the second metal conductive strip 521 in the first direction.
[0039] In a preferred embodiment of the present invention, the first toothed bus bar 514 extends beyond the first metal conductive strip 511 by 1 to 10 mm, and the second toothed bus bar 524 extends beyond the second metal conductive strip 521 by 1 to 10 mm. The length by which the first toothed bus bar 514 extends beyond the first metal conductive strip 511 and the length by which the second toothed bus bar 524 extends beyond the second metal conductive strip 521 can be the same or different.
[0040] In a preferred embodiment of the present invention, to avoid tip hot spots, the spacing between adjacent first racks in the first toothed bus bar 514 is less than or equal to 200 mm, and the spacing between adjacent second racks in the second toothed bus bar 524 is less than or equal to 200 mm.
[0041] In a preferred embodiment of the present invention, the thickness of the first comb-shaped bus strip 512 and the second comb-shaped bus strip 522 is 5 to 35 μm. In order to further reduce the generation of bubbles and make the covering surface smoother, the thickness of the first comb-shaped bus strip 512 and the second comb-shaped bus strip 522 is preferably 10 to 20 μm.
[0042] In the present invention, five embodiments are provided to illustrate the structures of the first comb-shaped bus strip 512 and the second comb-shaped bus strip 522 .
[0043] Example 1
[0044] like Figure 2 As shown, the first racks of the first tooth bus bar 514 have the same length, the second racks of the second tooth bus bar 524 have the same length, and are arranged opposite to the second racks in the first direction.
[0045] Specifically, if Figure 2 As shown, a conductive film layer 40 is formed on the first substrate 10. The lengths of the four sides of the conductive film layer 40 are all smaller than the lengths of the corresponding sides of the first substrate 10. A film-free area is formed near the edge of the first substrate 10 and outside the edge of the conductive film layer 40. The heating busbar 50 is located in the area of the conductive film layer 40. Figure 2 As shown, the first heating busbar 51 is located near the top of the conductive film layer 40 , and the second heating busbar 52 is located near the bottom of the conductive film layer 40 .
[0046] The first heating busbar 51 includes a first comb-shaped busbar 512 and a first metal conductive strip 511. The first metal conductive strip 511 can be copper foil, and the first comb-shaped busbar 512 can be a silver paste printed strip. The first comb-shaped busbar 512 includes a first main busbar 513 extending along the second direction and a first toothed busbar 514 connected to the lower side of the first main busbar 513 and extending downward. The first toothed busbar 514 has multiple first teeth evenly distributed on the first main busbar 513.
[0047] The second heating busbar 52 includes a second comb-shaped busbar 522 and a second metal conductive strip 521. The second metal conductive strip 521 may be copper foil, and the second comb-shaped busbar 522 may be a silver paste printed strip. The second comb-shaped busbar 522 includes a second main busbar 523 extending along a second direction and a second toothed busbar 524 connected to the underside of the second main busbar 523 and extending downward. The second toothed busbar 524 has multiple second teeth evenly distributed on the second main busbar 523.
[0048] The first rack and the second rack are arranged opposite to each other one by one. Assuming that when the first heating busbar and the second heating busbar approach each other along the first direction, the first rack and the second rack will gradually overlap each other.
[0049] Example 2
[0050] like Figure 3 As shown, the first racks of the first tooth bus bar 514 have the same length, the second racks of the second tooth bus bar 524 have the same length, and the first racks and the second racks are staggered in the first direction.
[0051] The rest is the same as Example 1.
[0052] Specifically, if Figure 3 As shown, the first rack and the second rack are staggered with each other. Assume that when the first heating busbar and the second heating busbar approach each other along the first direction, the first rack and the second rack will gradually cross each other, that is, there is a second rack between every two adjacent first racks, and there is a first rack between every two adjacent second racks.
[0053] Example 3
[0054] like Figure 4 As shown, in the second direction, the length of the first rack of the first tooth bus bar 514 gradually increases from both sides to the middle, and the length of the second rack of the second tooth bus bar 524 gradually increases from both sides to the middle.
[0055] The rest is the same as in Example 1.
[0056] Specifically, if Figure 4 As shown, the first rack gradually lengthens from the left and right sides to the middle position, and the second rack gradually lengthens from the left and right sides to the middle position, which can form irregular heating gradient lines at the ends of the first tooth bus bar 514 and the ends of the second tooth bus bar 524, which is beneficial to improving heating efficiency.
[0057] Example 4
[0058] like Figure 5 As shown, the lengths of adjacent first racks are different, and the lengths of intermediate first racks are the same; the lengths of adjacent second racks are different, and the lengths of intermediate second racks are the same.
[0059] Other details are the same as in Example 1.
[0060] Specifically, if Figure 5 As shown, in the first toothed bus bar 514 , the lengths of the first racks located at adjacent positions are different, and the lengths of the first racks located at intervals are the same, that is, in the second direction, the lengths of the first racks are alternately arranged long and short, forming a staggered structure at the end of the first toothed bus bar 514 .
[0061] In the second toothed bus bar 524 , the second racks at adjacent positions have different lengths, and the second racks at spaced positions have the same length, that is, in the second direction, the lengths of the second racks are alternately arranged long and short, forming a staggered structure at the end of the second toothed bus bar 524 .
[0062] The staggered structure design can form irregular heating gradient lines at the ends of the first tooth-shaped bus bar 514 and the ends of the second tooth-shaped bus bar 524 , which is beneficial to improving heating efficiency.
[0063] The first rack and the second rack are opposite to each other in the second direction. The longer first rack and the longer second rack can be opposite to each other, and the shorter first rack and the shorter second rack can be opposite to each other. Figure 5 In the structure shown, the longer first rack and the shorter second rack are opposite to each other, and the shorter first rack and the longer second rack are opposite to each other.
[0064] Example 5
[0065] like Figure 6 As shown, the first tooth bus bar 514 includes multiple groups of first tooth groups, and the first racks of each group of first tooth groups gradually grow from both ends to the middle along the second direction. The second tooth bus bar 524 includes multiple groups of second tooth groups, and the second racks of each group of second tooth groups gradually grow from both ends to the middle along the second direction.
[0066] Other details are the same as in Example 1.
[0067] Specifically, if Figure 6 As shown, the first tooth-shaped bus bar 514 includes a plurality of first tooth groups, each of which is composed of first tooth groups that gradually lengthen from both ends to the middle, forming a first tooth group with a pointed portion.
[0068] The second tooth-shaped busbar 524 includes a plurality of second tooth groups, each of which is composed of second tooth groups that gradually lengthen from both ends to the middle, forming a second tooth group with a pointed portion.
[0069] The tips of the first teeth group and the tips of the second teeth group are opposite to each other, or Figure 6 As shown, the tip of the first tooth group and the tip of the second tooth group are offset and opposite to each other.
[0070] The design of the first tooth group with a pointed structure and the second tooth group with a pointed structure can form irregular heating gradient lines at the ends of the first tooth bus bar 514 and the second tooth bus bar 524, which is beneficial to improving heating efficiency.
[0071] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.
Claims
1. A heatable sandwich structure, characterized in that: The sandwich structure comprises a first substrate (10), an intermediate layer (20) and a second substrate (30) bonded in sequence; Also included between the first substrate (10) and the intermediate layer (20) is a conductive film layer (40) formed on the first substrate (10) and a heating busbar (50) formed on the conductive film layer (40); The heating busbar (50) comprises a first heating busbar (51) and a second heating busbar (52), wherein the first heating busbar (51) is close to one edge of the conductive film layer (40), and the second heating busbar (52) is arranged opposite to the first heating busbar (51) and close to the other edge of the conductive film layer (40); The first heating busbar (51) comprises a first comb-shaped busbar (512) and a first metal conductive strip (511); the second heating busbar (52) comprises a second comb-shaped busbar (522) and a second metal conductive strip (521); the first tooth-shaped busbar (514) on the first comb-shaped busbar and the second tooth-shaped busbar (524) on the second comb-shaped busbar extend in a direction approaching each other; The first substrate includes coated glass, PET film, PET plate or organic glass plate, and the second substrate includes coated glass, PET film, PET plate or organic glass plate.
2. The heatable sandwich structure according to claim 1, wherein The direction parallel to the first toothed busbar (514) is a first direction, the end of the first toothed busbar (514) exceeds the width covered by the first metal conductive strip (511) in the first direction, and the end of the second toothed busbar (524) exceeds the width covered by the second metal conductive strip (521) in the first direction.
3. The heatable sandwich structure according to claim 2, characterized in that The length of the first toothed busbar (514) exceeding the first metal conductive strip is 1 to 10 mm, and the length of the second toothed busbar (524) exceeding the second metal conductive strip is 1 to 10 mm.
4. The heatable sandwich structure according to claim 3, characterized in that The spacing between adjacent first racks in the first tooth-shaped bus bar (514) is less than or equal to 200 mm, and the spacing between adjacent second racks in the second tooth-shaped bus bar (524) is less than or equal to 200 mm.
5. The heatable sandwich structure according to claim 1, wherein: The thickness of the first comb-shaped bus strip (512) and the second comb-shaped bus strip (522) is 5 to 35 μm.
6. The heatable sandwich structure according to any one of claims 1 to 5, characterized in that: The plurality of first racks have the same length, the plurality of second racks have the same length, and the first racks are arranged opposite to the second racks in the first direction.
7. The heatable sandwich structure according to any one of claims 1 to 5, characterized in that: The plurality of first racks have the same length, the plurality of second racks have the same length, and the first racks and the second racks are staggered in a first direction.
8. The heatable sandwich structure according to any one of claims 1 to 5, characterized in that: A direction perpendicular to the first direction is a second direction. In the second direction, the length of the first rack gradually increases from both sides to the middle. In the second direction, the length of the second rack gradually increases from both sides to the middle.
9. The heatable sandwich structure according to any one of claims 1 to 5, characterized in that: The lengths of adjacent first racks are different, and the lengths of intermediate first racks are the same; the lengths of adjacent second racks are different, and the lengths of intermediate second racks are the same.
10. The heatable sandwich structure according to any one of claims 1 to 5, characterized in that: The first tooth busbar (514) includes multiple groups of first tooth groups, and the first tooth groups of each group of first tooth groups gradually grow from both ends to the middle along the second direction; the second tooth busbar (524) includes multiple groups of second tooth groups, and the second tooth groups of each group of second tooth groups gradually grow from both ends to the middle along the second direction.