Electrochromic diaphragm, electrochromic device and terminal product

Abstract

The embodiment of the present application provides an electrochromic film, an electrochromic device and a terminal product, wherein in the electrochromic film: a first bus bar is connected to conduct a plurality of first electrodes exposed by a plurality of first grooves, and a second bus bar is connected to conduct a plurality of second electrodes exposed by a plurality of second grooves; the surfaces of the first bus bar and the second bus bar are both covered with a protective layer; at least the first groove adjacent to the first lead electrode and the second groove adjacent to the second lead electrode are mutually penetrated and the projection parts in the thickness direction of the electrochromic film overlap, and are not completely covered by the protective layer and the corresponding bus bar. The electrochromic film, the electrochromic device and the terminal product provided by the embodiment of the present application, by setting the protective layer in the groove and covering the lead electrode and the bus bar in the groove, the oil is isolated, so that the failure of the film caused by the oil phenomenon is avoided.

Description

Technical Field

[0001] This application belongs to the field of electrochromic technology, and particularly relates to an electrochromic film, an electrochromic device, and an end product. Background Technology

[0002] Electrochromic films are smart materials whose optical properties can be altered by applying an external voltage, reversibly adjusting their color state (from transparent to tinted) and brightness. Current electrochromic films typically consist of a first substrate layer, a first conductive layer, an electrochromic layer, an ion storage layer, an electrolyte layer, a second conductive layer, and a second substrate layer, all stacked together. The electrolyte layer usually contains organic solvents and solid particles.

[0003] Current electrochromic films are formed by creating grooves and exposing part of the conductive layer to create electrodes. These grooves penetrate the electrolyte layer. Under high temperatures, solvent in the electrolyte layer overflows from the grooves and slowly flows across the grooved area, migrating and accumulating at the edges of the electrochromic film, resulting in an oily substance, known as "oil seepage." Over time, the electrolyte solvent eventually comes into contact with the busbar and lead-out electrodes, causing a break in the circuit between the lead-out electrodes and the busbar, ultimately leading to the failure of the entire electrochromic film. Summary of the Invention

[0004] In view of this, embodiments of this application provide an electrochromic film, an electrochromic device, and a terminal product to solve the technical problem that existing electrochromic films fail due to "oil seepage".

[0005] In a first aspect, embodiments of this application provide an electrochromic film, wherein the edge regions of its two opposing surfaces are respectively provided with a plurality of first grooves and a plurality of second grooves. The electrochromic film includes a first busbar, a second busbar, a first lead-out electrode, and a second lead-out electrode. The first busbar connects and conducts to the plurality of first electrodes exposed by the plurality of first grooves, and the second busbar connects and conducts to the plurality of second electrodes exposed by the plurality of second grooves. The first lead-out electrode is connected to the first busbar, and the second lead-out electrode is connected to the second busbar. The surfaces of the first busbar and the second busbar are both covered with a protective layer. At least the first groove adjacent to the first lead-out electrode and the second groove adjacent to the second lead-out electrode are interconnected and overlap in the projection portion in the thickness direction of the electrochromic film, and are not completely covered by the protective layer and the corresponding busbar.

[0006] Because the grooves penetrate the electrolyte layer, electrolyte solution will flow out from the sidewalls (the cross-sections with the electrolyte layer) of the first and second grooves. If the electrolyte solution flows to the connection between the lead-out electrodes, it will cause an open circuit between the lead-out electrodes and the conductive layer, resulting in the membrane malfunctioning. Research has found that the main reason is that the original groove width was insufficient, which required the protective layer to be set in a Z-shape when attaching the adhesive layer. This resulted in a gap between the protective layer and the sidewalls of the grooves, making it impossible to tightly seal the cross-sections of the electrolyte layer, leading to leakage of electrolyte solution from the electrolyte layer. Therefore, this embodiment widens the grooves (i.e., widens the first and second grooves towards the center of the membrane, increasing their width). This increases the space in the width direction of the grooves, allowing the protective layer to be placed directly within the grooves without starting from the surface of the substrate layer, and completely covering the busbar located within the grooves. This eliminates the original gaps and ensures the reliability of the connection between the lead-out electrodes and the busbars.

[0007] In some embodiments, the depth and width of the first groove adjacent to the first lead-out electrode are greater than the width of the remaining first grooves, and the depth and width of the second groove adjacent to the second lead-out electrode are greater than the width of the remaining second grooves. By widening the width of the groove where the lead-out electrode is located, the distance between the oil outlet and the lead-out electrode is effectively extended, thereby preventing oily fluid from flowing to the lead-out electrode.

[0008] In a specific embodiment, the width of the first groove is 10-15 mm, and the width of the second groove is 10-15 mm. Setting the groove width within this range allows for both an increase in electrode length and more space for the protective layer. Furthermore, it also increases the distance between the cross-section of one electrolyte layer and the lead-out electrode, thus helping to prevent oily fluid from flowing to the lead-out electrode.

[0009] In some embodiments, the edge of the electrochromic film is further provided with a third groove, which connects the first groove with a first lead electrode and the second groove with a second lead electrode. Thus, by creating the third groove, the first groove, one of its sidewalls, and the sidewall of the second groove adjacent to that sidewall are removed (in other words, the two existing oil outlets are eliminated), effectively reducing the overflow of oily substances. Furthermore, after connecting the first and second grooves through the third groove, during subsequent lamination, the electrolyte cut surfaces of the first and second grooves can be sealed by potting adhesive, thereby completely preventing the overflow of oily substances.

[0010] In some embodiments, a first protective layer is provided in the first groove adjacent to the first lead-out electrode, covering a portion of the first busbar located in the first groove; a second protective layer is provided in the second groove adjacent to the second lead-out electrode, covering a portion of the second busbar located in the second groove. This prevents oil from overflowing from the outlet point in the groove adjacent to the lead-out electrode to the lead-out electrode; primarily, it prevents oily substances from damaging the connection between the busbar and the electrode.

[0011] In some embodiments, a first protective layer is disposed within all the first grooves, covering a portion of the first busbar located within the first groove; a second protective layer is disposed within all the second grooves, covering a portion of the second busbar located within the second groove; and the third groove connects adjacent first and second grooves. This prevents oily substances from damaging the connection between the busbar and the electrode.

[0012] In some embodiments, the first lead-out electrode includes a first electrode portion and a first connection portion, the first connection portion being located on the first electrode, the first electrode portion being located on the side of the first connection portion away from the first electrode, and the first busbar covering the first electrode portion.

[0013] The second lead-out electrode includes a second electrode portion and a second connecting portion. The second connecting portion is located on the second electrode, and the second electrode portion is located on the side of the second connecting portion away from the second electrode. The second busbar covers the second electrode portion. In a specific embodiment, the first electrode portion is the connection end of the FBC, and the first connecting portion is a copper foil. Connecting the first electrode and the FPC through the copper foil helps to improve the connection reliability between the FPC and the electrode.

[0014] In some embodiments, the length of the first connecting portion is greater than the length of the first electrode portion, and the width of the first connecting portion is greater than the width of the first electrode portion; the length of the second connecting portion is greater than the length of the second electrode portion, and the width of the second connecting portion is greater than the width of the second electrode portion. Setting the size of the first connecting portion (copper foil) to be larger than the size of the first electrode portion (connecting end of the FPC) is beneficial to increasing the conductive area of ​​the electrode and the lead-out electrode.

[0015] In some embodiments, the electrochromic film comprises, in sequence, a first substrate layer, a first conductive layer, a functional layer, a second conductive layer, and a second substrate layer; The first groove penetrates the first base layer, the first conductive layer, the functional layer, and the exposed portion of the second conductive layer to form the first electrode. The second groove penetrates the second base layer, the second conductive layer, the functional layer, and the exposed portion of the first conductive layer to form the second electrode. This simplifies the external circuit connection.

[0016] In other embodiments, the first groove penetrates the first substrate layer, and the exposed portion of the first conductive layer forms the first electrode; the second groove penetrates the second substrate layer, and the exposed portion of the second conductive layer forms the second electrode. The underlying conductive layer can be exposed simply by etching away the substrate layer from one side. The etching depth is easily controlled, the process is mature and reliable, and it is suitable for mass production.

[0017] In some embodiments, the electrochromic film further includes a first barrier layer and a second barrier layer. The first barrier layer is sequentially attached to the first substrate layer, the first conductive layer, the functional layer, and the second conductive layer, and is used to prevent the first busbar from connecting to the first conductive layer. The second barrier layer is sequentially attached to the second substrate layer, the second conductive layer, the functional layer, and the first conductive layer, and is used to prevent the second busbar from connecting to the second conductive layer. This effectively prevents the first busbar from simultaneously contacting both the first and second conductive layers, and also prevents the second busbar from simultaneously contacting both the second and first conductive layers, thus avoiding a short circuit.

[0018] Secondly, embodiments of this application provide an electrochromic device, comprising the electrochromic film described in the first aspect; two glass layers respectively located on both sides of the electrochromic film; and an adhesive layer filling the space between the glass layers and the electrochromic film, wherein the adhesive layer seals the electrolyte layer. Because it includes the electrochromic film described in the first aspect, it possesses all the beneficial effects described in the first aspect.

[0019] Thirdly, embodiments of this application provide a terminal product, including the electrochromic film described in the first aspect or the electrochromic device described in the second aspect, wherein the terminal product includes any one of a rearview mirror, curtain wall, car sunroof, car side window, car windshield, housing of electronic products, glasses, vehicle, and display panel. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of an electrochromic film in the prior art; Figure 2 This is a side view of the electrochromic film provided in the embodiments of this application. Figure 1 ; Figure 3 This is a schematic diagram of the first groove structure in the electrochromic film provided in the embodiments of this application; Figure 4 This is a schematic diagram of the second groove structure in the electrochromic film provided in the embodiments of this application; Figure 5 This is a cross-section of the electrochromic film provided in the embodiments of this application along the X direction. Figure 1 ; Figure 6 This is a cross-section of the electrochromic film provided in the embodiments of this application along the X direction. Figure 2 ; Figure 7 This is a cross-section of the electrochromic film provided in the embodiments of this application along the X direction. Figure 3 ; Figure 8 This is a cross-section of the electrochromic film provided in the embodiments of this application along the X direction. Figure 4 ; Figure 9 This is a cross-section of the electrochromic film provided in the embodiments of this application along the X direction. Figure 5 ; Figure 10 This is a side view of the electrochromic film provided in the embodiments of this application. Figure 2 ; Figure 11 This is a side view of an electrochromic film provided in another embodiment of this application. Figure 1 ; Figure 12 This is a schematic diagram of the electrode arrangement in the electrochromic film provided in this application embodiment. Figure 1 ; Figure 13 This is a schematic diagram of the electrode arrangement in the electrochromic film provided in this application embodiment. Figure 2 ; Figure 14 This is a side view of an electrochromic film provided in another embodiment of this application. Figure 2 ; Figure 15 This is a schematic diagram of the electrochromic device provided in the embodiments of this application.

[0022] The attached icon numbers are as follows: 10. Electrochromic film; 11. First substrate layer; 12. First conductive layer; 13. Functional layer; 131. Electrochromic layer; 132. Electrolyte layer; 133. Ion storage layer; 14. Second conductive layer; 15. Second substrate layer; 100. First groove; 1000. First electrode; 101. Second groove; 1010. Second electrode; 102. Third groove; 103. Spacer region; 20. First busbar; 21. Second busbar; 30. First lead-out electrode; 301. First electrode portion; 302. First connecting portion; 31. Second lead-out electrode; 311. Second electrode portion; 312. Second connecting portion; 40. First protective layer; 41. Second protective layer; 400. Protective layer; 50. First barrier layer; 51. Second barrier layer; 60. Glass layer; 70. Adhesive layer. Detailed Implementation

[0023] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that the embodiments of this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the embodiments of this application with unnecessary detail.

[0024] It should also be understood that the term "and / or" as used in the specification of embodiments of this application and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0026] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 the embodiments of 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 the embodiments of this application.

[0027] Furthermore, in the description of the embodiments and the appended claims of this application, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0028] In the description of embodiments in this application, references to "some embodiments" or "some embodiments" mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in some embodiments," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiments, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. "A plurality" refers to two or more.

[0029] It should be noted that the Chinese meanings of the English abbreviations appearing in this article are as follows: FPC (Flexible Printed Circuit Board) - Lead-out electrodes; ITO - Conductive layer (Indium Tin Oxide); ACF - Anisotropic conductive film; PVB - Polyvinyl Butyral; EC - Electrochromic layer; X direction: Width direction of the groove; Y direction: Length direction of the groove.

[0030] It should be noted that the following three paragraphs are only for the purpose of helping to understand the background of the technical solution proposed in this application and the technical problem to be solved in this application, and are not necessarily prior art.

[0031] The fabrication of electrochromic devices typically includes the following steps: (1) Multiple grooves penetrating the second substrate layer, the second conductive layer, and the electrolyte layer are formed from the surface of the second substrate layer toward the interior of the electrochromic film in the edge region of the film, with each groove exposing the corresponding first conductive layer; similarly, multiple grooves penetrating the first substrate layer, the first conductive layer, and the electrolyte layer are formed from the surface of the first substrate layer toward the interior of the film, with each groove exposing the corresponding second conductive layer; (2) Multiple electrodes are connected in series on each surface of the electrochromic film using copper foil (busbar); (3) Conductive adhesive is used to bond each layer of copper foil to each electrode. One FPC is electrically connected to the positive conductive layer and the other FPC is electrically connected to the negative conductive layer. Thus, an external controller can be used to connect the two FPCs to power the electrochromic device, thereby controlling the device to change color; (4) Waterproof tape is attached to part of the surface of the substrate and the side wall of the groove and covered with copper foil to form a water vapor barrier layer to prevent water vapor from entering the electrochromic film and causing the electrochromic film to fail; (5) PVB adhesive layer is used to cover the entire electrochromic film between the two pieces of glass and the two pieces are hot-pressed at high temperature to melt the PVB adhesive layer and form an electrochromic device.

[0032] Due to the formation Figure 2 When the first electrode 1000 and the second electrode 1010 are shown, that is, when opening Figure 2 During the process of creating the first groove 100 and the second groove 101, the electrolyte layer 132 in the functional layer 13 is cut off. The electrolyte layer 132 contains an electrolyte solution. Under high temperature conditions, the electrolyte solvent in the electrochromic membrane 10 overflows and slowly flows into the groove, migrating and accumulating at the edge of the membrane, resulting in an oily substance, referred to as "oil seepage." Over time, the electrolyte solvent eventually comes into contact with the busbar and the lead-out electrode. Upon contact with the lead-out electrode, the electrolyte solvent wets the anisotropic conductive adhesive film, causing a decrease in adhesion. The conductive adhesive bonded to the lead-out electrode also experiences reduced adhesion due to the electrolyte solvent, leading to failure. This causes the lead-out electrode to disconnect from the busbar, ultimately resulting in an open circuit failure.

[0033] Even if a protective layer is installed on the busbar, Figure 1Taking the first protective layer 40 as an example, one end of the first protective layer 40 is fixed to the surface of the substrate layer and then adhered to the first conductive layer 12 and the electrolyte layer 132, and then attached to the second conductive layer 14, the busbar, etc. Due to the height difference between the substrate layer and the busbar, the first protective layer 40 attached to the surfaces of the two will be stepped to conform to the height difference. Since the busbar protrudes from the surface of the second conductive layer 14, it is inevitable that the first protective layer 40 cannot make tight contact with the surface of the first conductive layer 12 near the end face of the first conductive layer 12. This results in a gap area between the first protective layer 40 and the surface where the busbar is located. The oily substance will flow along the gap area to the connection between the lead-out electrode and the busbar, causing the connection to break and causing an open circuit. Over time, this will lead to the failure of the diaphragm.

[0034] Based on the aforementioned technical problems, the first aspect of this application provides an electrochromic film 10, which is made by widening the grooves towards the center of the film, so that the grooves are along... Figure 3 The larger space in the X direction (i.e., the width direction of the groove) facilitates the subsequent installation of a protective layer to cover the lead-out electrodes and busbars located within the groove. In addition, it also allows the lead-out electrodes to be further away from the oil outlet point (the cut in the electrolyte layer 132 on the sidewall of the groove), so that even if oil overflows, it cannot reach the lead-out electrodes, thereby effectively avoiding the connection reliability between the lead-out electrodes and between the lead-out electrodes and the busbars, and thus solving the problem of the electrochromic membrane 10 failing due to oil leakage.

[0035] like Figure 2 , Figure 5 as well as Figure 6As shown, the first aspect of this application provides an electrochromic film 10. The edge regions of the two opposing surfaces of the electrochromic film 10 are respectively provided with a plurality of first grooves 100 and a plurality of second grooves 101. The electrochromic film 10 includes a first busbar 20, a second busbar 21, a first lead-out electrode 30, and a second lead-out electrode 31. The first busbar 20 connects and conducts to the plurality of first electrodes 1000 exposed by the plurality of first grooves 100, and the second busbar 21 connects and conducts to the plurality of second electrodes 1000 exposed by the plurality of second grooves 101. Electrode 1010; First lead electrode 30 is connected to first busbar 20, and second lead electrode 31 is connected to second busbar 21. Both the surfaces of first busbar 20 and second busbar 21 are covered with a protective layer 400. At least the first groove 100 adjacent to the first lead electrode 30 and the second groove 101 adjacent to the second lead electrode 31 are interconnected. The projection portions of the first groove 100 and the second groove 101 in the thickness direction of the electrochromic film 10 overlap and are not completely covered by the protective layer 400 and the corresponding busbar. In other words, the protective layer 400 and the corresponding busbar (first busbar 20 or second busbar 21) at least cover a portion of the bottom of the first groove 100 and the second groove 101.

[0036] Compared to the existing protection layer 400 setup, such as Figure 5 and Figure 6 As shown, the protective layer 400 of the electrochromic film 10 provided in this embodiment does not completely cover the entire groove. Because of this, the protective layer 400 can completely cover the busbar and the lead-out electrode, and isolate the side of the busbar and the lead-out electrode near the middle of the electrochromic film from the oil outlet, so as to prevent oily substances from flowing to the busbar and the lead-out electrode, thereby protecting the lead-out electrode from corrosion.

[0037] In some embodiments, such as Figure 2 and Figure 10 as well as Figure 11As shown, the first groove 100 adjacent to the first lead-out electrode 30 and the second groove 101 adjacent to the second lead-out electrode 31 are interconnected. This means that the first groove 100 where the first lead-out electrode 30 is located and the second groove 101 where the second lead-out electrode 31 is located are interconnected. Specifically, a third groove 102 can be formed at the edge of the electrochromic film 10, and the third groove 102 connects the first groove 100 where the first lead-out electrode 30 is located and the second groove 101 where the second lead-out electrode 31 is located. In this way, by forming the third groove 102, the first groove 100 and one of its sidewalls and the sidewall of the second groove 101 adjacent to that sidewall are removed (in other words, the two oil outlets that originally existed are removed), effectively reducing the overflow of oily substances. Furthermore, after the first groove 100 and the second groove 101 are connected by the third groove 102, the electrolyte cross-sections of the first groove 100 and the second groove 101 can be sealed by potting glue during the subsequent lamination process, thereby completely preventing the overflow of oily substances. Furthermore, the third groove 102 connects any two adjacent first grooves 100 and second grooves 101 on the edge of the membrane. After the first grooves 100 and second grooves 101 are connected by the third groove 102, the electrolyte cross-sections of the first grooves 100 and second grooves 101 can be sealed by potting glue during the subsequent lamination process, thereby completely preventing the overflow of oily substances.

[0038] In other embodiments, all the first grooves 100 and the adjacent second grooves 101 are interconnected, and the projection portions of the first grooves 100 and the second grooves 101 in the thickness direction of the electrochromic film 10 overlap.

[0039] In some embodiments, the protective layer 400 and the corresponding busbar (first busbar 20 or second busbar 21) at least partially cover the bottom of the first groove 100 and the second groove 101. Specifically, the protective layer 400 and the first busbar 20 cover the bottom of the first groove 100, and the protective layer and the second busbar 21 cover the bottom of the second groove 101. In other embodiments, the protective layer 400 and the first busbar 20 completely cover the bottom of the first groove 100, and the protective layer and the second busbar 21 completely cover the bottom of the second groove 101. In other embodiments, the protective layer 400 and the first busbar 20 completely cover the bottom of the first groove 100, and the protective layer and the second busbar 21 partially cover the bottom of the second groove 101. In other embodiments, the protective layer 400 and the first busbar 20 partially cover the bottom of the first groove 100, and the protective layer and the second busbar 21 completely cover the bottom of the second groove 101.

[0040] like Figure 10As shown, the electrochromic film 10 includes a first base layer 11, a first conductive layer 12, a functional layer 13, a second conductive layer 14 and a second base layer 15 stacked sequentially, and the functional layer 13 includes an electrolyte layer 132. The edge of the electrochromic film 10 is provided with a plurality of first grooves 100 and a plurality of second grooves 101. The first grooves 100 penetrate the first base layer 11, the first conductive layer 12 and the functional layer 13, and expose the second conductive layer 14 to form a plurality of first electrodes 1000. The second grooves 101 penetrate the second base layer 15, the second conductive layer 14 and the functional layer 13, and expose the first conductive layer 12 to form a plurality of second electrodes 1010. The edge of the electrochromic film 10 is also provided with a first bus bar 20 and a second bus bar 21. The first bus bar 20 is connected to conduct multiple first electrodes 1000, and the second bus bar 21 is connected to conduct multiple second electrodes 1010. The electrochromic film 10 also includes a first lead-out electrode 30 and a second lead-out electrode 31. The first lead-out electrode 30 is disposed in a first groove 100 and is connected to a first electrode 1000 and a first busbar 20, respectively. The second lead-out electrode 31 is disposed in a second groove 101 and is connected to a second electrode 1010 and a second busbar 21, respectively. Among them, such as Figure 2 As shown, the protective layer 400 includes a first protective layer 40 disposed in the first groove 100. The first protective layer 40 is disposed along the width direction of the first groove 100 and covers the portion of the first busbar 20 and the first lead-out electrode 30 located in the first groove 100. The protective layer 400 also includes a second protective layer 41 disposed in the second groove 101. The second protective layer 41 is disposed along the width direction of the second groove 101 and covers the portion of the second busbar 21 and the second lead-out electrode 31 located in the second groove 101.

[0041] The electrochromic diaphragm 10 (hereinafter referred to as the diaphragm) provided in this application embodiment has a protective layer set in the groove, which covers the lead-out electrode and the busbar located in the groove to isolate oily substances. In fact, compared with the prior art, the groove is widened (that is, the first groove 100 and the second groove 101 are dug deeper towards the middle of the diaphragm, so that the width of the first groove 100 and the second groove 101 is increased). In this way, the space in the width direction of the groove is increased, and the protective layer does not need to be set from the surface of the base layer, but can be set directly in the groove, and can completely cover the busbar located in the groove. This makes the gap area between the original protective layer and the electrolyte layer 132 disappear, preventing oily substances from flowing to the lead-out electrode through the gap area, thereby ensuring the reliability of the connection between the lead-out electrode and the busbar.

[0042] In applications, such as Figure 3 and Figure 4 As shown in the diagram, the positions of the first groove 100 and the second groove 101 in the prior art are indicated by dashed lines. Compared to the prior art, this embodiment of the application widens the grooves, specifically widening the first groove 100 and the second groove 101 towards the center of the diaphragm, resulting in more space in the X direction. This allows for the lengthening of the electrodes, and more importantly, facilitates the installation of the protective layer. The protective layer can be entirely located within the grooves, covering the lead-out electrodes and busbars. Specifically... Figures 5 to 8 As shown, the first protective layer 40 is connected to the second conductive layer 14 at both ends, and its middle portion is located on the first busbar 20, covering both the first busbar 20 and the first lead-out electrode 30. The second protective layer 41 is connected to the first conductive layer 12 at both ends, and its middle portion is located on the second busbar 21, covering both the second busbar 21 and the second lead-out electrode 31. Compared with the protective layer configuration in the prior art, this eliminates the original gap area, preventing oily substances from flowing through the protective layer to the connection point between the lead-out electrode and the busbar, thus avoiding diaphragm failure due to oil leakage. Furthermore, it is worth mentioning that because the groove is widened, the oil outlet point near the middle of the diaphragm is farther from the connection point between the lead-out electrode and the busbar, making it even more difficult for oily substances to flow to this connection point.

[0043] It should be noted that the width of the first groove 100 and the second groove 101 refers to the distance from the edge of the diaphragm towards the center of the diaphragm, i.e. Figure 3 and Figure 4 The X direction is defined in the diagram, while the length direction of the diaphragm edge is defined in the Y direction, which is also the orientation of the busbar. This is for ease of understanding and should not be construed as a limitation of the technical solution presented in this application.

[0044] In some embodiments, the depth and width of the first groove 100 adjacent to the first lead-out electrode 30 are greater than the width of the other first grooves 100, and the depth and width of the second groove 101 adjacent to the second lead-out electrode 31 are greater than the width of the other second grooves 101. By widening the width of the groove where the lead-out electrode is located, the distance between the oil outlet and the lead-out electrode is effectively extended, thereby preventing oily substances from flowing to the lead-out electrode.

[0045] In some embodiments, the width of the first groove 100 is 10-15 mm, and the width of the second groove 101 is 10-15 mm. For example... Figure 3 and Figure 4As shown, the width of both the first groove 100 and the second groove 101 is L, which ranges from 10 to 15 mm. In a specific embodiment, the width of the first groove 100 and the second groove 101 can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or 15 mm, preferably 12 mm. By setting the groove width within this range, the length of the electrode can be increased, and more space can be provided for the protective layer. Furthermore, it also allows the cross-section of one of the electrolyte layers 132 to be further away from the lead-out electrode, which helps to prevent oily fluid from flowing to the lead-out electrode.

[0046] In some embodiments, such as Figure 5 and Figure 6 As shown, a first lead-out electrode 30 is disposed in a first groove 100 (on a first electrode 1000), and a second lead-out electrode 31 is disposed in a second groove 101 (on a second electrode 1010). Specifically, the first lead-out electrode 30 and the second lead-out electrode 31 are disposed in adjacent first grooves 100 and second grooves 101; alternatively, they can be disposed in non-adjacent first grooves 100 and second grooves 101. This facilitates the connection between the external controller and the lead-out electrodes by placing the two lead-out electrodes on adjacent electrodes. For example, the first lead-out electrode 30 can be disposed in the middle of the first electrode 1000, and the second lead-out electrode 31 can be disposed in a first electrode 1000 or a second electrode 1010 adjacent to the first electrode 1000. Preferably, the first lead-out electrode 30 is disposed in the middle of the first electrode 1000, and the second lead-out electrode 31 is disposed on the surface of the second substrate layer 15 on the back side of the first electrode 1000.

[0047] In some embodiments, such as Figures 5 to 8 As shown, the protective layer 400 forms a gap region 103 with the side of the first groove 100 and / or the second groove 101 near the color-changing area of ​​the electrochromic film 10. Specifically, the first protective layer 40 forms a gap region 103 with the side of the first groove 100 near the color-changing area of ​​the electrochromic film 10, or the second protective layer 41 forms a gap region 103 with the side of the second groove 101 near the color-changing area of ​​the electrochromic film 10, or the first protective layer 40 forms a gap region 103 with the side of the first groove 100 near the color-changing area of ​​the electrochromic film 10, and simultaneously the second protective layer 41 forms a gap region 103 with the side of the second groove 101 near the color-changing area of ​​the electrochromic film 10. The presence of the gap region 103 provides a safe distance between the oil outlet point of the electrochromic film 10 and the lead-out electrode and the busbar, effectively preventing oily substances from flowing towards the busbar and the lead-out electrode.

[0048] In some embodiments, such as Figure 9As shown, the protective layer 400 is in direct contact with the side of the first groove 100 and / or the second groove 101 near the color-changing area of ​​the electrochromic film 10. The electrolyte layer is sealed by the first protective layer 40 or the second protective layer 41, thereby preventing the electrolyte from flowing to the lead-out electrodes and busbars.

[0049] It should be noted that the electrochromic film 10 includes a color-changing region in the center and interval regions surrounding the color-changing region. The color-changing region, also known as the active region, is the part of the electrochromic film 10 that undergoes reversible color and transparency changes under an applied voltage. The edge region, also known as the inactive region or sealing region, is the area surrounding the color-changing region that does not undergo color change. Its main function is to provide encapsulation and protection, serving as a seal, insulation, and lead.

[0050] In applications, such as Figure 7 and Figure 8 As shown, the first lead-out electrode 30 can also be disposed on the surface of the second substrate layer 15 on the back side of the first electrode 1000, and the second lead-out electrode 31 can be disposed on the surface of the first substrate layer 11 on the back side of the second electrode 1010. Alternatively, the first lead-out electrode 30 can be disposed on the surface of the first substrate layer 11 on the back side of the second electrode 1010, and the second lead-out electrode 31 can be disposed on the surface of the second substrate layer 15 on the back side of the first electrode 1000. The term "back side" refers to the side where the first lead-out electrode 30 is located as the front side of the electrochromic film 10, and the side where the second lead-out electrode 31 is located as the back side of the electrochromic film 10. The above description is for ease of understanding of this solution only and should not be construed as a limitation on the scope of protection of the embodiments of this application.

[0051] It should be noted that the multiple first electrodes 1000 and multiple second electrodes 1010 mentioned above are actually electrode layers formed by the entire second conductive layer 14 and the first conductive layer 12, which together form a positive electrode and a negative electrode. The first electrode 1000 can be a positive electrode and the second electrode 1010 can be a negative electrode; conversely, the first electrode 1000 can be a negative electrode and the second electrode 1010 can be a positive electrode.

[0052] In application, the middle part of the first electrode 1000 or the second electrode 1010 includes the following situations: the lead-out electrode is located in the middle of the entire first electrode 1000 (i.e., the center of the bottom wall of the first groove 100), or in the middle position of the edge of the first electrode 1000. This can maximize the distance between the lead-out electrode and the tangential surface of the groove, and effectively avoid the wetting of the electrolyte solution.

[0053] In some embodiments, such as Figure 7 and Figure 8As shown, when the second lead-out electrode 31 is located on the surface of the substrate layer, the projections of the second lead-out electrode 31 and the first lead-out electrode 30 in the thickness direction of the electrochromic film 10 at least partially overlap. That is, the first lead-out electrode 30 is located in the middle of an electrode, and the second lead-out electrode 31 is located on the surface of the substrate layer corresponding to that electrode. Specifically, the first lead-out electrode 30 is located in the middle of the first electrode 1000, and the second lead-out electrode 31 is located on the surface of the second substrate layer 15 on the back side of the first electrode 1000; or the first lead-out electrode 30 is located in the middle of a second electrode 1010, and the second lead-out electrode 31 is located on the surface of the first substrate layer 11 on the back side of the second electrode 1010. By placing the first lead-out electrode 30 and the second lead-out electrode 31 on opposite sides of an electrode, it facilitates connection and conduction with an external controller, and also ensures that the lead-out electrode on the substrate layer surface is as far away as possible from the oil outlet point, avoiding disconnection due to oil seepage.

[0054] In some embodiments, a first protective layer 40 is provided in a first groove 100 adjacent to the first lead-out electrode 30, covering a portion of the first busbar 20 located within the first groove 100. A second protective layer 41 is provided in a second groove 101 adjacent to the second lead-out electrode 31, covering a portion of the second busbar 21 located within the second groove 101. This prevents oil from overflowing from the outlet point in the groove adjacent to the lead-out electrode to the lead-out electrode; primarily, it prevents oily substances from damaging the connection between the busbar and the electrode. Further, a first protective layer 40 is provided in all first grooves 100, covering a portion of the first busbar 20 located within the first groove 100. A second protective layer 41 is provided in all second grooves 101, covering a portion of the second busbar 21 located within the second groove 101. A third groove 102 connects adjacent first grooves 100 and second grooves 101. This prevents oily substances from damaging the connection between the busbar and the electrode.

[0055] In some embodiments, such as Figure 10 As shown, the first groove 100 and the second groove 101 are alternately arranged on both sides of the electrochromic film 10. Multiple first grooves 100 and second grooves 101 are distributed along the edge, equivalent to setting distributed electrode contact points around the perimeter of the film. The first busbar 20 and the second busbar 21 are connected in series with the same type of electrode points to form a low-resistance current path, allowing current to be uniformly injected into / extracted from the entire conductive layer from the edge. This avoids excessive voltage drop in the edge area caused by a single lead point, ensuring uniform color change across a large area of ​​the film.

[0056] In some embodiments, such as Figure 12 and Figure 13As shown, the first lead-out electrode 30 includes a first electrode portion 301 and a first connecting portion 302. The first connecting portion 302 is located on the first electrode 1000, and the first electrode portion 301 is located on the side of the first connecting portion 302 away from the first electrode 1000. The first busbar 20 covers the first electrode portion 301. The second lead-out electrode 31 includes a second electrode portion 311 and a second connecting portion 312. The second connecting portion 312 is located on the side of the second substrate layer 15 away from the first electrode 1000, and the second electrode portion 311 is disposed on the side of the second connecting portion 312 away from the second substrate layer 15. The second busbar 21 covers the second electrode portion 311. In other embodiments, the first lead-out electrode 30 includes a first electrode portion 301 and a first connecting portion 302. The first connecting portion 302 is located on the side of the first substrate layer 11 away from the second electrode 1010, and the first electrode portion 301 is disposed on the side of the first connecting portion 302 away from the first substrate layer 11. The first busbar 20 covers the first electrode portion 301. The second lead-out electrode 31 includes a second electrode portion 311 and a second connecting portion 312. The second connecting portion 312 is located on the second electrode 1010, and the second electrode portion 311 is located on the side of the second connecting portion 312 away from the second electrode 1010. The second busbar 21 covers the second electrode portion 311. In a specific embodiment, the first electrode portion 301 and the second electrode portion 311 are the connection ends of the lead-out electrode, and the first connecting portion 302 and the second connecting portion 312 are copper foils. The copper foils connect and conduct the first electrode 1000 and the FPC, which helps to improve the connection reliability between the FPC and the electrode.

[0057] In applications, directly bonding the lead-out electrode to the conductive layer presents the following difficulties: While the conductive layer (ITO, indium tin oxide) is a good transparent conductor, its surface is relatively hard and brittle, and its bonding strength with the conductive particles in the ACF is not as reliable as that of metals (such as copper). Directly using ACF to bond the FPC to the ITO electrode may pose the following risks: unstable contact resistance, insufficient bonding strength, and low bonding process yield. Copper foil, on the other hand, possesses excellent conductivity, ductility, and solderability (equivalent to "bondability" for ACF bonding). ACF bonding technology is very mature and reliably used to connect FPCs and copper foil. The copper foil, as the connecting part, can provide a low-resistance, large-area, stable electrical connection; the connection point formed by ACF on the copper foil has low and stable resistance. This small section of copper foil, when attached to the electrode, is equivalent to introducing a low-resistance metal busbar at the edge of the electrode. It can effectively diffuse the current introduced by the FPC laterally across the entire electrode surface, reducing the voltage drop from the electrode edge to the center, making the voltage across the entire electrochromic region more uniform, thus ensuring more uniform color change, faster response speed, and more consistent performance. This is especially important for large-area EC devices.

[0058] In applications, the FPC itself possesses a degree of flexibility, while the copper foil, acting as a relatively rigid transition layer, can better absorb and disperse the stress generated between the FPC and the EC substrate due to differences in thermal expansion coefficients or slight bending deformation. This prevents stress from directly acting on the fragile FPC-electrode layer connection interface or the electrode layer itself, thereby improving the mechanical reliability and long-term stability of the connection. The ACF bonding points of the FPC-copper foil and the bonding points of the copper foil-ITO (typically using conductive tape, conductive silver paste, or high-performance pressure-sensitive adhesive + conductive layer) are each completed at more reliable material interfaces (metal-metal or metal-polymer), offering greater resistance to mechanical and thermal stress than direct FPC-ITO bonding. The high-precision ACF bonding process (requiring precise alignment, temperature, and pressure control) is confined to the FPC and a small piece of copper foil. This step can be performed in a more controlled environment (such as at the FPC supplier or on specialized bonding equipment), resulting in higher yields. The shape (strip, L-shape, etc.) and bonding position (edge, corner, etc.) of the copper foil can be flexibly designed according to electrode design requirements to optimize current distribution. FPCs can be bonded to copper foil first, and then connected to electrodes through the copper foil. This provides greater design freedom for the routing of FPCs and the final connector lead-out direction.

[0059] In some embodiments, such as Figure 12 and Figure 13 As shown, the length of the first connecting portion 302 is greater than the length of the first electrode portion 301, and the width of the first connecting portion 302 is greater than the width of the first electrode portion 301. The length of the second connecting portion 312 is greater than the length of the second electrode portion 311, and the width of the second connecting portion 312 is greater than the width of the second electrode portion 311. Setting the size of the first connecting portion 302 (copper foil) to be larger than the size of the first electrode portion 301 (connecting end of FPC) is beneficial to increasing the conductive area of ​​the electrode and the lead-out electrode.

[0060] In application, the first lead-out electrode 30 further includes a first lead-out portion, and the second lead-out electrode 31 further includes a second lead-out portion. The lead-out portion extends outward from the groove and is used to provide a connection position for an external controller, facilitating connection. The connection portion of the lead-out electrode is made of copper foil. By bonding the lead-out electrode to the copper foil and then placing it on the electrode, it is beneficial to increase the conductive area between the lead-out electrode and the electrode, and also to enhance the connection reliability between the lead-out electrode and the electrode.

[0061] In application, functional layer 13 includes an electrochromic layer 131, an electrolyte layer 132, and an ion storage layer 133 stacked sequentially; the positions of the electrochromic layer 131 and the ion storage layer 133 can be interchanged. That is, functional layer 13 may also include an ion storage layer 133, an electrolyte layer 132, and an electrochromic layer 131 stacked sequentially.

[0062] In applications, both the first substrate layer 11 and the second substrate layer 15 are transparent substrates. The "transparent substrate" is an optically transparent material, specifically a flexible substrate material, such as polyethylene terephthalate (PET), polycarbonate (PC), polyimide (PI), cyclic olefin copolymers, or cellulose triacetate. The first substrate layer 11 and the second substrate layer 15 can also be glass substrates.

[0063] Both the first conductive layer 12 and the second conductive layer 14 are transparent conductive layers. The material of the "transparent conductive layer" can be any transparent conductive material well known to those skilled in the art, such as indium-tin oxide (ITO), aluminum zinc oxide (AZO), fluorine-doped tin oxide (FTO), silver nanowires, graphene, carbon nanotubes, metal meshes, or silver nanoparticles.

[0064] The electrochromic layer 131 is a sheet composed of one or more layers of gel-state or solid materials, such as polymer-dispersed liquid crystal (PDLC) layers, suspended particle devices (SPD) layers, and electrochromic (EC) layers. For electrochromic (EC) type electrochromic layers 131, they may include a color-changing material layer, an electrolyte layer 132, and an ion storage layer 133 stacked sequentially. The materials of the color-changing material layer, electrolyte layer 132, and ion storage layer 133 can be materials available in the prior art, and this application does not impose any special limitations on them.

[0065] The electrochromic film 10 has busbars on both sides in the thickness direction. Exemplarily, the busbars can be other conductive materials, including but not limited to conductive copper foil, conductive adhesive, and conductive resin. This allows a multi-electrode structure to be formed at the edge of the dimming film, accelerating the color-changing speed of the dimming film. The first busbar 20 and the second busbar 21 can be made of conductive materials well known to those skilled in the art, such as at least one of conductive silver paste, conductive copper paste, conductive carbon paste, nano-silver conductive ink, copper foil, copper wire, and conductive adhesive film.

[0066] FPCs are typically mounted on busbars to enable conduction between the busbar and external power circuitry. They can be flexible circuit boards, rolled copper / aluminum foil, electrolytic copper / aluminum foil, etc., and the material can be aluminum, copper, silver, tin, or other conductive elemental metals, non-metallic semiconductor conductive materials, their platings, or other conductive metal oxides or combinations thereof. FPCs can also be directly formed as power supplies with control modules to directly conduct electricity to the EC layer. FPCs can be directly soldered to busbars or connected to them using conductive adhesives (such as ACF).

[0067] The first adhesive layer 70 and the second adhesive layer 70 can also be waterproof tape or insulating tape. They can be made into tapes. Their main function is to cover and seal the edge of the diaphragm, thereby preventing moisture, impurities and other contaminants from entering the interior of the diaphragm through the first groove 100 or the second groove 101, thus achieving the sealing and protection of the dimming diaphragm.

[0068] In some embodiments, such as Figure 14 As shown, the electrochromic film 10 also includes a first barrier layer 50 and a second barrier layer 51. The first barrier layer 50 is fixed in sequence to the first base layer 11, the first conductive layer 12, the functional layer 13 and the second conductive layer 14. The first barrier layer 50 prevents the first busbar 20 from being connected to the first conductive layer 12. The second barrier layer 51 is sequentially fixed to the second base layer 15, the second conductive layer 14, the functional layer 13, and the first conductive layer 12. The second barrier layer 51 prevents the second busbar 21 from connecting to the second conductive layer 14. In a specific embodiment, the first barrier layer 50 and the second barrier layer 51 are spacer tapes, whose main function is to prevent the busbar located on one side of the electrochromic film 10 from being simultaneously connected to the first conductive layer 12 and the second conductive layer 14, thus preventing a short circuit.

[0069] In some embodiments, the uncovered areas of the first groove 100 and the second groove 101 are filled with a filler adhesive. Specifically, the filler adhesive is provided within the gap 103 formed between the first groove 100, the second groove 101, and the color-changing area of ​​the electrochromic membrane 10. Specifically, the filler adhesive is PVB adhesive. In other embodiments, the filler adhesive can also be one of an ionomer gel layer, a photocurable electrolyte adhesive layer, or a conductive polymer hydrogel layer. This facilitates further sealing of the oil outlet points of the membrane, thereby preventing electrolyte leakage and erosion of the lead-out electrodes. Furthermore, embodiments of this application provide an electrochromic device, such as... Figure 15As shown, the device includes the aforementioned electrochromic film 10, two glass layers 60, and an adhesive layer 70. The two glass layers 60 are located on both sides of the electrochromic film 10, respectively; the adhesive layer 70 fills the space between the glass layers 60 and the electrochromic film 10. Furthermore, the material of the adhesive layer 70 is the same as that of the filler adhesive. Specifically, it can be one of PVB adhesive, an ionogel layer, a photocurable electrolyte adhesive layer, or a conductive polymer hydrogel layer.

[0070] This application provides an electrochromic device, such as... Figure 15 As shown, it includes the electrochromic film 10 described in the first aspect; Two glass layers 60 are located on both sides of the electrochromic film 10, respectively; An adhesive layer 70 is filled between the glass layer 60 and the electrochromic film 10, sealing the uncovered areas of the first groove 100 and the second groove 101. Because it includes the electrochromic film 10 described in the first aspect, it possesses all the beneficial effects described in the first aspect.

[0071] In some embodiments, such as Figure 12 , Figure 13 as well as Figure 15 As shown, the adhesive layer 70 fills the first groove 100 and the second groove 101 through the third groove 102, and seals the cross-section of the electrolyte layer 132, thereby preventing oily substances from overflowing. Specifically, PVB is used to cover the entire electrochromic film 10 between the two glass layers 60 and then hot-pressed at high temperature. After the PVB melts at high temperature, it flows into the "hole" and fills it (the "hole" is formed between the first groove 100 and the second groove 101 through the setting of the third groove 102), thereby isolating the solvent migration in the electrolyte.

[0072] This application provides a terminal product, including the electrochromic film described in the first aspect or the electrochromic device described in the second aspect, wherein the terminal product includes any one of a rearview mirror, curtain wall, car sunroof, car side window, car windshield, electronic product housing, glasses, vehicle, and display panel.

[0073] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0074] The above-described embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them. Although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of the embodiments of this application.

Claims

1. An electrochromic film, wherein the edge regions of its two opposing surfaces are respectively provided with a plurality of first grooves and a plurality of second grooves, the electrochromic film comprising a first busbar, a second busbar, a first lead-out electrode, and a second lead-out electrode, wherein the first busbar connects to and conducts a plurality of first electrodes exposed by the plurality of first grooves, and the second busbar connects to and conducts a plurality of second electrodes exposed by the plurality of second grooves; the first lead-out electrode is connected to the first busbar, the second lead-out electrode is connected to the second busbar, and both the first busbar and the second busbar are covered with a protective layer; characterized in that, At least the first groove adjacent to the first lead electrode and the second groove adjacent to the second lead electrode are interconnected and overlap in the projection portion of the electrochromic film in the thickness direction, and are not completely covered by the protective layer and the corresponding busbar.

2. The electrochromic film as described in claim 1, characterized in that, The width of the first groove adjacent to the first lead electrode is greater than the width of the other first grooves, and the width of the second groove adjacent to the second lead electrode is greater than the width of the other second grooves.

3. The electrochromic film as described in claim 1, characterized in that, The first lead electrode is located in a first groove, and the second lead electrode is located in a second groove.

4. The electrochromic film as described in claim 1, characterized in that, The area of ​​each of the first and second grooves near the color-changing region of the electrochromic film is not covered by the protective layer and the corresponding busbar.

5. The electrochromic film as described in claim 1, characterized in that, The first lead-out electrode includes a first electrode portion and a first connecting portion. The first connecting portion is located on the first electrode, and the first electrode portion is located on the side of the first connecting portion away from the first electrode. The first busbar covers the first electrode portion. The second lead-out electrode includes a second electrode portion and a second connecting portion. The second connecting portion is located on the second electrode, and the second electrode portion is located on the side of the second connecting portion away from the second electrode. The second busbar covers the second electrode portion.

6. The electrochromic film as described in claim 5, characterized in that, The length of the first connecting portion is greater than the length of the first electrode portion, and the width of the first connecting portion is greater than the width of the first electrode portion; The length of the second connecting portion is greater than the length of the second electrode portion, and the width of the second connecting portion is greater than the width of the second electrode portion.

7. The electrochromic film as described in claim 1, characterized in that, The electrochromic film comprises, in sequence, a first base layer, a first conductive layer, a functional layer, a second conductive layer, and a second base layer; The first groove penetrates the first base layer, the first conductive layer, the functional layer, and the exposed portion of the second conductive layer to form the first electrode; the second groove penetrates the second base layer, the second conductive layer, the functional layer, and the exposed portion of the first conductive layer to form the second electrode; or, The first groove penetrates the first base layer and the exposed portion of the first conductive layer to form the first electrode, and the second groove penetrates the second base layer and the exposed portion of the second conductive layer to form the second electrode.

8. The electrochromic film as described in claim 7, characterized in that, The electrochromic film further includes a first barrier layer and a second barrier layer. The first barrier layer is sequentially attached to the first substrate layer, the first conductive layer, the functional layer and the second conductive layer. The first barrier layer is used to prevent the first busbar from connecting to the first conductive layer. The second barrier layer is sequentially attached to the second base layer, the second conductive layer, the functional layer, and the first conductive layer. The second barrier layer is used to prevent the second busbar from connecting to the second conductive layer.

9. An electrochromic device, characterized in that, include: The electrochromic film as described in any one of claims 1 to 8; Two glass layers are located on both sides of the electrochromic film, respectively; An adhesive layer is filled between the glass layer and the electrochromic film, and seals the uncovered areas of the first groove and the second groove.

10. A terminal product, characterized in that, Includes the electrochromic film as described in any one of claims 1 to 8 or the electrochromic device as described in claim 9, wherein the end product includes any one of rearview mirrors, curtain walls, car sunroofs, car side windows, car windshields, housings of electronic products, eyeglasses, vehicles, and display panels.

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