Electrochromic inner laminate device

Abstract

The electrochromic inner laminated device comprises a transparent substrate, an electrochromic film layer, a laminated adhesive film layer and a transparent cover plate which are sequentially formed, the electrochromic film layer comprises an electrochromic layer, an ion conduction layer and an ion storage layer which are sequentially formed between the two transparent electrode layers; a BFL layer is added between the electrochromic film layer and the laminated adhesive film layer; the BFL layer is of a compact multi-layer nanostructure, isolates the laminated adhesive film layer and the electrochromic film layer and seals the electrochromic film layer. The BFL layer is added between the electrochromic film layer and the laminated adhesive film layer of the electrochromic glass, the BFL layer can isolate influence factors such as water, oxygen and organic matters slowly released by the laminated adhesive film, and in addition, the structural adhesive and the sealing adhesive tape are added to the side face of an electrochromic inner laminated device and the periphery of the film layer for sealing, so that the service life of the film layer is prolonged, and the service life of the film layer is prolonged. And the failure process of the electrochromic film layer is effectively delayed, so that the whole electrochromic device has a more stable component structure.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochromic glass, in particular to an electrochromic inner laminated device. Background Art

[0002] Inorganic electrochromic glass has become an everyday fixture in our lives and workplaces. Compared to organic electrochromic materials, inorganic electrochromic materials offer better cyclic stability and are less susceptible to degradation and failure. Furthermore, compared to semi-solid and organic electrochromic glass structures, they are easier to encapsulate and effectively isolate moisture and air from entering the electrochromic film, preventing chemical reactions that could damage the nanomaterials within.

[0003] In actual use, different application scenarios and fields will have special requirements for the size, thickness, sealing performance, long-term environmental weathering resistance testing, etc. of the glass. However, at this stage, after long-term water vapor sealing weathering resistance testing, boiling experiments, high temperature and high humidity or UV weathering resistance testing, some sealing structures of electrochromic inner laminate devices have unstable structures, resulting in failure and damage to the film layer and edge seals of the electrochromic device. Among them, during the UV weathering resistance test of the electrochromic inner laminate device, due to the influence of ultraviolet light irradiation and high temperature, the inner laminate film will peel off or slowly release some organic substances, causing the electrochromic film layer to gradually fail. During the long-term high temperature and high humidity test of the electrochromic inner laminate device, the electrochromic film layer will come into contact with water vapor or oxygen to produce a chemical reaction, causing the film layer to fail or be damaged, etc. Therefore, sealing with an inner laminate film is far from enough and still does not meet the requirements of the industry testing standards. The Chinese invention patent with publication number CN109856882A focuses on the preparation and application of laminated films made of polymer materials, and conducts improvements on laminated films and tests on inner laminated film sealed glass.

[0004] In order to solve the problem that the electrochromic film layer is easily corroded and damaged by the water and oxygen environment, in addition to improving the sealing performance by using the improved solution of the laminated adhesive film, the occurrence of erosion damage can also be delayed by optimizing the edge sealing of the electrochromic inner laminated glass. To this end, the Chinese invention patent with publication number CN113917756A uses butyl glue to perform edge sealing on the side of the device to delay the failure of the functional layer. The Chinese patent with publication number CN104656336A drips sealant on the side of the device and finally uses ultraviolet light to cure the sealant. However, during the actual stability test process, the above technical solutions still have the problem of water, oxygen or organic matter corroding the electrochromic film layer. Summary of the Invention

[0005] In view of the fact that the electrochromic film layer in the existing electrochromic inner laminate device is easily corroded by water, gas or other slow-release substances and becomes ineffective, the present application provides an electrochromic inner laminate device.

[0006] The technical solution of the present application provides an electrochromic inner laminate device, comprising a transparent substrate, an electrochromic film layer, a laminated adhesive film layer and a transparent cover formed in sequence; the transparent cover and substrate comprise one or more of soda-lime glass, silicate glass, an organic polymer transparent substrate or a translucent substrate or a fluoride glass.

[0007] The electrochromic film layer includes an electrochromic layer, an ion conducting layer and an ion storage layer sequentially formed between two transparent electrode layers; A BFL layer is added between the electrochromic film layer and the laminated film layer; the BFL layer has a dense layered structure, isolating the laminated film layer and the electrochromic film layer, and plays a role in blocking moisture and protecting the electrochromic film layer.

[0008] Preferably, the BFL layer is composed of a dense protective layer structure of one or more layers comprising metal oxide, metal nitride, carbide, non-metal oxide, non-metal nitride or single / double metal nano-coating.

[0009] Preferably, the material of the BFL layer comprises one or more of boron nitride, aluminum oxide, titanium dioxide, magnesium oxide, montmorillonite, tin oxide, zinc oxide, nickel chromium oxide, chromium nitride, nickel chromium nitride, tantalum carbide, aluminum carbide, silicon carbide, silicon oxide, silicon nitride, gold, copper, silver, chromium, nickel, aluminum, NiCr, and ZnSn; Alternatively, the thickness of the film material of the BFL layer is 5 nm-500 nm.

[0010] Preferably, the transparent electrode layer comprises one or more of indium tin oxide, aluminum-doped zinc oxide, or fluorine-doped tin oxide; Alternatively, the ion-conducting layer comprises a lithium-containing inorganic salt or a lithium-free metal oxide; Alternatively, the ion storage layer comprises a nanomaterial capable of storing ions and electrons, an anode color-changing material or a cathode color-changing material having complementary properties to the electrochromic layer.

[0011] Preferably, the electrochromic film layer is prepared by at least one of chemical vapor deposition, magnetron sputtering, vacuum evaporation, electroplating or spray pyrolysis.

[0012] Preferably, the laminated adhesive film layer is a single film layer or a stack of several film layers, and the film layer material of the laminated adhesive film layer includes one or more of polyvinyl butyral, ethylene-vinyl acetate copolymer, polyurethane, and ionotropic adhesive film.

[0013] Preferably, the material of the transparent substrate and the transparent cover plate includes one or more of soda-lime glass, silicate glass, an organic polymer transparent substrate, a semi-transparent substrate or fluoride glass.

[0014] Preferably, functional glass is further included. The functional glass is formed at a certain distance on the outer surface of the transparent cover plate, and a spacer layer is formed between the transparent cover plate and the functional glass. The spacer layer is filled with gas or film material.

[0015] Preferably, the adhesive film material includes one or more of polyvinyl butyral, ethylene-vinyl acetate copolymer, polyurethane, and ionotropic adhesive film.

[0016] Preferably, the wires are connected to the silver paste led out of the transparent electrode layer of the electrochromic film layer respectively, and the wire connections are sealed with sealing tape, which is at least one of silicone glue, polyurethane glue, butyl glue, and organic silica gel.

[0017] The present invention adds a BFL layer between the electrochromic film layer and the laminated film layer of the electrochromic glass. The BFL layer can ensure isolation from factors such as water and oxygen and organic matter slowly released by the laminated film, so that the entire electrochromic device has a more stable component structure, effectively delays the failure process of the electrochromic film layer, and expands its application range in certain fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the film structure of the electrochromic inner laminate device of this application; Figure 2 Schematic diagram of wire connection and sealing of the electrochromic inner laminate device of this application; Figure 3 Schematic diagram of edge sealant sealing of the electrochromic inner laminate device of the present application; Figure 4 Schematic diagram of the side structural adhesive sealing of the electrochromic inner laminate device of this application; Figure 5 、 6 A schematic diagram of another embodiment of the electrochromic inner laminate device of the present application; Figure 7 A schematic diagram of an embodiment of the electrochromic inner laminate device of the present application having an outer frame fixed thereto; Figure 8 Schematic diagram of the failure of an electrochromic inner laminate device without a BFL layer and sealing tape after aging in a UV weathering box; Figure 9 The figure shows the failure of an electrochromic inner laminate device without a BFL layer and sealing tape after aging in a constant temperature and humidity chamber; Figure 10 The figure shows the visible light transmittance curve of the electrochromic inner laminate device without BFL layer and sealing tape after aging in a UV weathering chamber and a constant temperature and humidity chamber, showing the failure of the film layer; Figure 11Shown is the visible light transmittance curve of the improved electrochromic inner laminate device with a BFL layer and a sealing tape seal after aging in a UV weathering chamber and a constant temperature and humidity chamber.

[0019] In the picture: 1: Transparent substrate; 2: Electrochromic film layer; 21: First electrode layer; 22: Electrochromic layer; 23: Ion conduction layer; 24: Ion storage layer; 25: Second electrode layer 3: BFL layer; 4: Laminated film layer; 5: Transparent cover; 6: Outer frame; 7: Functional glass; 8: Spacer layer. DETAILED DESCRIPTION

[0020] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. In this specification, the size ratios in the drawings do not represent the actual size ratios, but are only used to reflect the relative positional relationship and connection relationship between the various components. Components with the same name or the same number represent similar or identical structures and are only for illustrative purposes.

[0021] Figure 1 This is a schematic diagram of the film structure of the electrochromic inner laminate device of the present application. The electrochromic inner laminate device comprises a transparent substrate 1, an electrochromic film layer 2, a BFL layer 3, a laminated adhesive film layer 4, and a transparent cover plate 5, all formed in sequence. The electrochromic film layer 2 is a specific electrochromic functional component. In the prior art, the electrochromic film layer 2 has a layered structure, comprising an electrochromic layer 22, an ion-conducting layer 23, and an ion-storage layer 24, formed in sequence between a first electrode layer 21 and a second electrode layer 25. The first electrode layer 21 and the second electrode layer 25 comprise, but are not limited to, one or more of indium tin oxide (ITO), aluminum-doped zinc oxide (AZO), or fluorine-doped tin oxide (FTO). The electrochromic layer 22 comprises, but is not limited to, one or both of a cathodically coloring nanomaterial (such as W, Ti, Nb, Mo, etc.) or an anodically coloring nanomaterial (such as V, Mn, Ni, Co, Fe, etc.). The ion conducting layer 23 includes but is not limited to lithium-containing inorganic salts (LiTaO3, LiNbO3, LiPON, etc.) or lithium-free metal oxides (Ta2O5, ZrO2, etc.); the ion storage layer includes but is not limited to nanomaterials with ion storage (NiWO x , TiO2) or anode (V, Mn, Ni, Co, Fe, etc.) or cathode (W, Ti, Nb, Mo, etc.) color-changing materials with complementary properties to the electrochromic layer. The electrochromic film layer 2 of the electrochromic inner laminate device may be prepared by, but is not limited to, one or more of chemical vapor deposition, magnetron sputtering, vacuum evaporation, electroplating, or spray pyrolysis.

[0022] The laminated film layer 4 can be a single layer or a composite of multiple layers of the same or different materials. Laminated film is a polymer plastic film that is bonded together using a high-temperature, high-pressure vacuum heat-melt process in a vacuum oven to bond two separate components together. Materials for the laminated film layer 4 include, but are not limited to, polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyurethane (PU), ionotropic adhesive film (SGP), or other laminated films.

[0023] The transparent substrate 1 and the transparent cover 5 may be made of glass or glass-like materials in the prior art, including but not limited to one or more of soda-lime glass, silicate glass, organic polymer transparent substrate or translucent substrate or fluoride glass.

[0024] As for the electrochromic film layer 2, its color-changing functional layer gradually loses effectiveness due to interaction with external moisture and organic matter released from the laminated film layer 4. Therefore, the technical solution of this application further incorporates a BFL layer (barrier film layer) 3 between the electrochromic film layer 2 and the laminated film layer 4. The BFL layer 3 isolates the laminated film layer 4 from the electrochromic film layer 2 and simultaneously seals the electrochromic film layer 2, preventing it from coming into contact with potential sources of influence within the packaged device.

[0025] The BFL layer 3 can be a dense protective layer structure composed of one or more layers including but not limited to metal oxides, metal nitrides, carbides, carbon oxides, non-metallic oxides, non-metallic nitrides or single / double metal nano-coatings. The BFL layer (3) is a dense nano-film structure of one or more layers. The BFL layer is between the electrochromic film layer (2) and the laminated adhesive film layer (4). The BFL film layer is used to block the organic molecules released by the laminated adhesive film during the reliability test from affecting the electrochromic layer. At the same time, the laminated adhesive film layer (4) can play the role of sealing the electrochromic device and laminating the adhesive device. The material combination of the barrier film BFL layer is as follows: 1. One material can have the function of blocking water, oxygen and organic molecules; it can also be repeatedly stacked in different film layers to enhance the barrier performance; 2. Different materials can be stacked or combined to enhance the function of blocking water, oxygen and organic molecules; 3. One material is placed in a certain layer or multiple layers of the multi-layer film layer and distributed at intervals, and also has different performance effects of blocking water, oxygen and organic molecules. Therefore, the barrier performance of the material of the BFL layer can be a certain function of the material alone; or it can be combined with other film layers to achieve the performance of blocking water, oxygen and organic molecules. The BFL layer 3 has the function of isolating water, oxygen and organic molecules. The barrier film layer referred to here is a non-metallic nitride, metal oxide, and the material of the non-metallic oxide includes but is not limited to boron nitride, aluminum oxide, titanium dioxide, silicon dioxide, magnesium oxide, montmorillonite or two or more metal oxides Cd2SnO4, Zn2SnO x , indium tin oxide or nitride materials or materials doped with other ions. The thickness of the film material of BFL layer 3 is between 5nm and 500nm; the metal oxide, metal nitride, carbide, non-metal nitride, single metal nanocoating or double metal nanocoating includes but is not limited to one or more of titanium dioxide, tin oxide, zinc oxide, nickel chromium oxide, chromium nitride, nickel chromium nitride, tantalum carbide, aluminum carbide, silicon carbide, silicon nitride, gold, copper, silver, chromium, nickel, aluminum, NiCr, ZnSn; the thickness of the film material of BFL layer 3 is between 5-500nm. The preparation of BFL film includes but is not limited to one or more of chemical vapor deposition, magnetron sputtering, vacuum evaporation, electroplating or spray pyrolysis. Laminated film is a material used to prepare laminated glass. It can bond components and seal after vacuum hot pressing, and can also play a sealing role. The sealant around the electrochromic film layer glass and the structural adhesive around the side edges of the entire electrochromic device strengthen the barrier against water vapor and air, and will not affect the film layer inside the color-changing smart device.

[0026] On the surface of the BFL layer, lay a single layer of laminated film PVB or EVA or PU or SGP or other laminated films or one or more of them. Figure 2As shown, the silver pastes drawn out from the upper and lower transparent electrode layers of the electrochromic film layer are connected to the wires respectively. In order to avoid failure of the seal at the wire connection, additional sealing tape is used to fit the upper and lower ends of the wires tightly. The sealing tape is silicone glue, polyurethane glue, butyl glue or organic silica gel to prevent the wires from contacting with water and oxygen. Finally, a transparent cover plate 5 is used to align the four edges of the film layer glass, and it is placed in a vacuum bag for vacuum, high-temperature and high-pressure hot-melt bonding to form an inner laminated glass structure. The transparent cover plate 5 includes but is not limited to one or more of soda-lime glass, silicate glass, organic polymer transparent substrate or translucent substrate or fluoride glass. As shown in FIG. Figure 3 As shown, on the basis of using sealing tape to seal the wires, in order to better isolate water vapor and air from entering the electrochromic inner laminated device, a single layer of laminated film PVB or EVA or PU or SGP or other laminated films and one or more of them are laid flat on the surface of the functional film layer glass, and then the edges of the wires and the film layer device are all sealed with sealing tape to achieve a better sealing effect. The sealing tape is one or more of silicone glue, polyurethane glue, butyl glue or organic silica gel. Finally, a transparent cover plate 5 is used to align the edges of the film layer glass, placed in a vacuum bag for vacuum, high temperature and high pressure hot melt bonding, and combined into a laminated device structure with better water vapor sealing. The transparent cover plate 5 includes but is not limited to one or more of soda lime glass, silicate glass, organic polymer transparent substrate or translucent substrate or fluoride glass. As Figure 4 As shown, after the conductors and the edges of the film layer are completely sealed with sealing tape, the sides of the electrochromic inner laminate can be resealed with structural adhesive. The structural adhesive can be epoxy, polysulfide, polyurethane, acrylic, transparent structural adhesive, or UV-curable adhesive. The structural adhesive provides structural support and edge sealing, further isolating moisture and air from entering the electrochromic inner laminated glass.

[0027] Typically, after sequentially forming a transparent substrate 1, electrochromic film layer 2, BFL layer 3, laminating film layer 4, and transparent cover plate 5, they are placed in a vacuum bag and hot-pressed in a vacuum autoclave to produce an electrochromic inner laminated glass. After the laminated glass components are assembled, they are bonded together and placed in a vacuum autoclave to heat-fuse, bond, seal, and secure the entire electrochromic assembly. Electrochromic inner laminated glass components can be used in automobiles, doors and windows, curtain walls, and electronic products.

[0028] like Figure 5 、 6As shown in the schematic diagram, the electrochromic inner laminated glass can be stacked with other functional glasses 7 to form an electrochromic inner laminated device with a hollow space or a laminated space. These functional devices include organic-inorganic electrochromic smart glass, inorganic electrochromic-low-emissivity glass smart glass, photovoltaic-architectural-electrochromic glass integrated smart glass or liquid crystal-inorganic electrochromic smart glass, etc. The combination between the electrochromic inner laminated device and the functional glass includes a hollow structure and a laminated structure. The electrochromic inner laminated glass and the functional glass can form a single or combined structure with multiple layers and multiple cavities. As shown in FIG. Figure 5 As shown, other functional glass 7 can be stacked to create a hollow or laminated structure. In other words, a spacer layer 8 can be formed between the electrochromic inner laminate device and the functional glass 7. This spacer layer 8 can be a hollow space or filled with a specific material, such as polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyurethane (PU), ionotropic adhesive (SGP), or other adhesive film materials. The hollow space can be vacuumed or filled with an inert gas. Taking a hollow electrochromic inner laminate device as an example, this is formed by stacking a piece of functional glass 7 on the outer surface of a transparent cover plate 5 at a certain distance. The laminated or hollow space is sealed around the outer edges of the transparent cover plate 5 using super spacer strips. Finally, the functional glass 7 and the transparent cover plate 5 are bonded together to form a hollow structure, the interior of which is vacuumed or filled with an inert protective gas, providing sound insulation and heat preservation. The structural adhesive used to seal the electrochromic device from the sides includes, but is not limited to, one or more of epoxy resin adhesive, polysulfide adhesive, polyurethane adhesive, acrylic adhesive, transparent structural adhesive, or UV-curable adhesive. The functional glass 7 and the transparent cover plate 5 include but are not limited to one or more of soda-lime glass, silicate glass, organic polymer transparent substrate or semi-transparent substrate or fluoride glass.

[0029] like Figure 7 As shown in the schematic diagram, the electrochromic inner laminate device also includes an outer frame 6. The outer frame 6 can be made of metal, including but not limited to aluminum, copper, alloys, or other new materials. It secures and seals the edges of the electrochromic glass, enhancing its aesthetics. The outer frame's retaining clips secure the glass within the metal frame; screws / bolts secure the components. Other mounting components are not detailed here; they can be added or removed as needed, ensuring the overall device's safety and aesthetics.

[0030] Figure 8 The figure shows the failure of an electrochromic inner laminate device without a BFL layer and sealing tape after 10,000 cycles of coloration / fading in a UV weathering chamber. Test conditions: The electrochromic inner laminate device is connected to the positive and negative leads of the test chamber, with the electrochromic film facing up, and placed in the UV weathering chamber. The xenon arc light source (1000W / m 2) and coloring / fading cycling tests (coloring / fading voltage ±1-5V, duration 2.5 minutes / 2 minutes; one cycle for each coloring / fading, for a total of 10,000 cycles). Without the protection of a sealant or BFL layer, the electrochromic film failed at both the cathode and anode ends. If the laminated electrochromic device were further cycled in a UV weathering chamber for stability testing, the failure area would expand or extend throughout the film.

[0031] Figure 9 The figure shows the failure of an electrochromic inner laminate device without a BFL layer and sealing tape after 10,000 cycles of coloring / fading in a constant temperature and humidity chamber. The test conditions are as follows: the electrochromic inner laminate device is connected to the positive and negative wires of the test chamber, with the electrochromic film facing up, and placed in a constant temperature and humidity chamber. The device is tested at 85°C, 95% high temperature and humidity, and under coloring / fading cycle conditions (coloring / fading voltage ±1-5V, time 2.5min / 2min; coloring / fading is completed in 1 cycle, for a total of 10,000 cycles). The electrochromic film layer, without the protection and sealing structure of the BFL layer, Figure 9 It was observed that the film layer of the electrochromic device first failed from the edges. If the electrochromic inner laminated glass continued to be cycled in a constant temperature and humidity chamber to test the sealing stability, the failure area would continue to expand or extend to the entire film layer.

[0032] Figure 10 The figure shows the visible light transmittance curve of the film surface failure of the electrochromic inner laminate device without BFL layer and sealing tape in the UV weathering box and constant temperature and humidity box after 10,000 cycles of coloring / fading test. The electrochromic layer of the film glass without BFL layer protection and sealing structure was tested in the UV weathering box under the conditions of xenon arc light source (1000W / m 2 After irradiation, constant temperature and humidity chamber (temperature 85℃, humidity 95Rh%) and 10,000 coloring / fading cycle tests (coloring / fading voltage ±1-5V, time 2.5min / 2min; coloring / fading completion is 1 cycle, a total of 10,000 cycles), the visible light transmittance of the faded state of the failed part of the film surface decreased by about 35%; the visible light transmittance of the colored state increased by about 5.18 times and 3.06 times compared with the initial state, respectively. Figure 3 and Figure 4 shown.

[0033] Figure 11Shown is the visible light transmittance curve of the improved electrochromic inner laminate device with a BFL layer and sealing tape after 10,000 cycles of coloring / fading in a UV weathering chamber and a constant temperature and humidity chamber. The five-layer structure of the electrochromic layer remains unchanged, and the corresponding materials for each layer are added as follows: the first electrode layer 21 and the second electrode layer 25 include, but are not limited to, one or more of indium tin oxide (ITO), aluminum-doped zinc oxide (AZO), or fluorine-doped tin oxide (FTO). The electrochromic layer 22 includes, but is not limited to, one or more of a cathodically coloring nanomaterial (W, Ti, Nb, Mo, etc.) or an anodically coloring nanomaterial (V, Mn, Ni, Co, Fe, etc.). The ion conductive layer 23 includes, but is not limited to, a lithium-containing inorganic salt (LiTaO3, LiNbO3, LiPON, etc.) or a lithium-free metal oxide (Ta2O5, ZrO2, etc.); the ion storage layer includes, but is not limited to, a nanomaterial capable of storing ions (NiWO x , TiO2) or anode (V, Mn, Ni, Co, Fe, etc.) or cathode (W, Ti, Nb, Mo, etc.) color-changing materials with complementary properties to the electrochromic layer, the electrochromic film layer 2 of the electrochromic inner laminate device includes but is not limited to being prepared by one or more methods including chemical vapor deposition, magnetron sputtering, vacuum evaporation, electroplating or spray pyrolysis. When the conductors and the edges of the film layer device are completely sealed with sealing tape, the side edges of the electrochromic inner laminate device are sealed again with structural adhesive. The structural adhesive is epoxy resin adhesive or polysulfide adhesive or polyurethane adhesive or acrylic or transparent structural adhesive or UV curing adhesive. The structural adhesive plays the role of structural support and edge sealing, further isolating water vapor and air from entering the electrochromic inner laminated glass, such as Figure 3 、 4 shown.

[0034] Electrochromic inner laminated device is exposed to xenon arc light source (1000W / m 2 ) irradiation, a constant temperature and humidity chamber (temperature 85°C, humidity 95Rh%) and 10,000 tinting / fading cycle tests (tinting / fading voltage ±1-5V, time 2.5min / 2min; tinting / fading completion is 1 cycle, a total of 10,000 cycles), the electrochromic performance remained relatively stable compared to the visible light transmittance in the initial faded state and tinted state; in addition, the electrochromic glass film layer also remained in good condition, with no film failure, bluing, watermarks or erosion from other influencing factors.

[0035] The above content only describes the preferred embodiments of the present invention and does not limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solution of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. An electrochromic inner laminate device, characterized in that: It comprises a transparent substrate (1), an electrochromic film layer (2), a laminated adhesive film layer (4) and a transparent cover plate (5) which are formed in sequence; The electrochromic film layer (2) comprises an electrochromic layer (22), an ion conducting layer (23) and an ion storage layer (24) which are sequentially formed between a first electrode layer (21) and a second electrode layer (25); A BFL layer (3) is added between the electrochromic film layer (2) and the laminated adhesive film layer (4); the BFL layer (3) is used to isolate the slowly released volatile organic substances between the electrochromic film layer and the laminated adhesive film layer (4).

2. The electrochromic inner laminate device according to claim 1, wherein The BFL layer (3) is composed of a dense protective layer structure of one or more layers comprising metal oxide, metal nitride, carbide, non-metal oxide, non-metal nitride or single / double metal nano coating.

3. The electrochromic inner laminate device according to claim 1, wherein: The material of the BFL layer (3) comprises one or more of aluminum oxide, titanium dioxide, magnesium oxide, montmorillonite, tin oxide, zinc oxide, nickel chromium oxide, chromium nitride, nickel chromium nitride, tantalum carbide, aluminum carbide, silicon carbide, silicon oxide, silicon nitride, gold, copper, silver, chromium, nickel, aluminum, NiCr, and ZnSn; Alternatively, the thickness of the film material of the BFL layer (3) is 5nm-500nm.

4. The electrochromic inner laminate device according to claim 1, wherein: The materials of the first electrode layer (21) and the second electrode layer (25) include one or more of indium tin oxide, aluminum-doped zinc oxide, or fluorine-doped tin oxide; Alternatively, the ion-conducting layer (23) comprises a lithium-containing inorganic salt or a lithium-free metal oxide; Alternatively, the ion storage layer (24) comprises a nanomaterial capable of storing ions and electrons, an anode color-changing material or a cathode color-changing material having complementary properties to the electrochromic layer.

5. The electrochromic inner laminate device according to claim 1, wherein: The electrochromic film layer (2) is prepared by at least one of chemical vapor deposition, magnetron sputtering, vacuum evaporation, electroplating or spray pyrolysis.

6. The electrochromic inner laminate device according to claim 1, wherein: The laminated adhesive film layer (4) is a single film layer or a stack of several film layers, and the film layer material of the laminated adhesive film layer (4) includes one or more of polyvinyl butyral, ethylene-vinyl acetate copolymer, polyurethane, and ionotropic adhesive film.

7. The electrochromic inner laminate device according to claim 1, wherein: The materials of the transparent substrate (1) and the transparent cover plate (5) include one or more of soda-lime glass, silicate glass, an organic polymer transparent substrate, a semi-transparent substrate or fluoride glass.

8. The electrochromic inner laminate device according to claim 1, wherein: The invention also includes functional glass (7), which is spaced a certain distance apart from the outer surface of the transparent cover plate (5) to form a hollow structure. A spacer layer (8) is formed between the transparent cover plate (5) and the functional glass (7). The spacer layer (8) is sealed between the transparent cover plate (5) and the functional glass (7) with a super spacer material having waterproof oxygen. The sealing method is to seal along the four edges of the independent transparent cover plate (5) or the functional glass (7) to form a hollow cavity structure. The interior of the hollow cavity is vacuum or filled with inert gas.

9. The electrochromic inner laminate device according to claim 1, wherein: The laminated adhesive film material includes one or more of polyvinyl butyral, ethylene-vinyl acetate copolymer, polyurethane, and ionotropic adhesive film.

10. The electrochromic inner laminate device according to claim 1, wherein: The positive and negative electrode wires are respectively connected to the silver pastes drawn out from the first electrode layer (21) and the second electrode layer (25) of the electrochromic film layer (2), and the connection points where the wires are drawn out are well affixed with sealing tape, and the sealing tape is at least one of silicone glue, polyurethane glue, butyl glue, and organic silica gel.

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