CN116068822A - Electrochromic device and application thereof - Google Patents

Abstract

The present invention provides an electrochromic device and its application, comprising: a first substrate; a first conductive layer disposed on the first substrate; a first bus bar disposed on the first conductive layer and located around it, To form a first closed area on the first conductive layer; a color-changing layer, which is arranged on the first conductive layer, and away from the first substrate; a second conductive layer, which is arranged on the color-changing layer, and is away from the first conductive layer; The second bus bar is arranged on the second conductive layer and located around it to form a second closed area on the second conductive layer; the area of the second closed area is equal to the area of the first closed area; The second base is arranged on the second conductive layer and away from the color changing layer. Through the design of the layout of the first bus bar and the second bus bar, the present invention effectively improves the discoloration rate of the device on the one hand, avoids material waste on the other hand, simplifies the preparation and lead-out process of the device, and improves the use of the device reliability.

Description

An electrochromic device and its application

technical field

The invention belongs to the technical field of color-changing displays, and in particular relates to an electrochromic device and its application.

Background technique

The electrochromic phenomenon refers to the reversible redox reaction of the material under the action of an external electric field and current, resulting in a change in its structure, which in turn changes the absorption spectrum or optical properties (such as transmittance, absorptivity, reflectivity) of the material. , exhibits a reversible change in color or transparency in appearance. At present, electrochromic devices have been widely used in energy-saving windows, automobile rearview mirrors and display devices and other fields.

Common electrochromic devices are generally composed of a base layer, a conductive layer, a color-changing active material layer, a conductive layer, and a base layer stacked in sequence. The color-changing active material layer includes an electrochromic material layer, an electrolyte layer, and an ion storage layer; the conductive layer A lead-out structure is arranged and connected on the top to realize the electrical connection between the external power supply and the electrochromic device.

Many researchers are committed to the development of new electrochromic devices and color-changing devices. For example, CN213365229U discloses an electrochromic device, which includes a first conductive layer, an electrochromic layer, a second conductive layer and an extraction electrode. The first conductive layer, the electrochromic layer and the second conductive layer are stacked; the first conductive layer includes the first overlapping area and the first staggered area, the second conductive layer includes the second overlapping area and the second staggered area, the first staggered area and the first staggered area At least part of the two staggered regions are located on the same side of the electrochromic layer, and the first bus bar is provided on the first conductive layer, the second bus bar is provided on the second conductive layer, and the lead-out electrodes are respectively connected to the first bus bar and the second bus bar. The two bus bars are turned on. CN112513726A discloses a device including an electrochromic device, which includes a first bus bar, which is electrically connected to a first transparent conductive layer; a second bus bar, which is electrically connected to a second transparent conductive layer, and the second bus bar a bar generally non-parallel to the first bus bar; and a third bus bar electrically coupled to the first transparent conductive layer and generally parallel to the first bus bar. CN113227892A discloses a device comprising a substrate with at least three sides and an active stack on said substrate, said active stack comprising a first transparent conductive layer, a second transparent conductive layer, an anode electrochemical layer and cathode electrochemical layer; also includes a first bus bar group, which includes a plurality of bus bars, each bus bar electrically coupled to the first transparent conductive layer; a second bus bar group, which includes a plurality of bus bars and each bus bar electrically coupled to the second transparent conductive layer; and a bus bar arrangement including bus bars from the first bus bar set and bus bars from the second bus bar set on at least three sides of the substrate.

Generally speaking, in order to have a better electrochromic rate in the electrochromic devices in the prior art, especially in large-sized fields such as electrochromic windows, the device is usually provided with multiple bus bars, and the bus bar layout adopts the "reverse ""-shaped layout method (that is, "mouth"-shaped bus bars of different sizes are arranged on the upper and lower conductive layers, and the "mouth" forms a combination of inner and outer circles by itself after the combination, forming a "back"-shaped structure) or staggered multi-stage layout method ( That is, multiple sections of bus bars are respectively arranged around the upper conductive layer, and there are gaps between each section of bus bars, and multiple sections of bus bars are also arranged on the lower conductive layer corresponding to the positions of the bus bar gaps of the upper conductive layer). The layout of the above bus bars will result in unequal corresponding areas of the upper and lower conductive layers, which not only causes waste of redundant materials around, but also requires setting instrument parameters corresponding to the different structures of the upper and lower bus bars when preparing the bus bars, resulting in more cumbersome operation process ; At the same time, in the staggered multi-section layout method, each section of the bus bar needs to be connected to the lead-out electrode, which has defects such as many lead-out electrodes, instability, and difficult maintenance. The above-mentioned defects will lead to insufficient reliability of the device.

Therefore, under the premise of maintaining a high color-changing efficiency, it is a research focus in this field to develop an electrochromic device that avoids material waste, has a simple lead-out method, is not easy to short-circuit, and has high reliability.

Contents of the invention

Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an electrochromic device and its application. Through the design of the layout of the first bus bar and the second bus bar, on the one hand, the discoloration rate of the device is effectively improved, and on the other hand, On the one hand, material waste is avoided, the fabrication and lead-out process of the device is simplified, and the reliability of the device is improved.

To achieve this purpose of the invention, the present invention adopts the following technical solutions:

In a first aspect, the present invention provides an electrochromic device, comprising: a first substrate; a first conductive layer disposed on the first substrate; a first bus bar disposed on the first conductive layer , and located around the first conductive layer, so as to form a first closed area on the first conductive layer; a color-changing layer, which is arranged on the first conductive layer and is away from the first substrate; the second Two conductive layers, which are arranged on the color-changing layer, and away from the first conductive layer; second bus bars, which are arranged on the second conductive layer, and are located around the second conductive layer, so as to A second closed area is formed on the second conductive layer; a second substrate is arranged on the second conductive layer and is away from the color-changing layer. Preferably, the area of the second enclosed area is equal to the area of the first enclosed area.

In the electrochromic device provided by the present invention, the first bus bar is arranged around the first conductive layer to form a closed pattern, that is, the first closed area; the second bus bar is arranged around the second Around the conductive layer, a closed pattern is formed, that is, the second closed area. This method of setting bus bars around the four sides of the conductive layer can effectively improve the discoloration rate of the electrochromic device; further, the first closed area The area of the closed area is equal to that of the second closed area, which not only ensures that the material area of the first bus bar and the second bus bar are the same, prevents material waste, etc., but also does not need to set the amount of bus bar materials separately in the process of preparing the bus bar parameters such as simplifies the preparation process; and the first bus bar and the second bus bar respectively forming a closed pattern significantly reduce the difficulty of setting the lead-out electrodes and reduce the number of lead-out electrodes, thereby improving the reliability of the electrochromic device. sex and stability etc.

Preferably, at least one of the first substrate and the second substrate is a transparent material. More preferably, the material of the first substrate and/or the second substrate is an optical grade transparent material, exemplarily including but not limited to: glass, PET (Polyethylene terephthalate, polyethylene terephthalate) , cycloolefin copolymer or cellulose triacetate, etc. Therefore, the optical property change of the electrochromic device can be displayed through the transparent substrate, and an appropriate substrate material can be selected according to the requirements of the application scene, so as to improve the applicability of the electrochromic device.

Preferably, the material of the first conductive layer and the second conductive layer is a transparent conductive material for displaying the optical property change of the electrochromic device, and the material is a conductive material known in the art, including but not limited to oxidation Any one or at least two of indium tin (ITO), aluminum zinc oxide (AZO), fluorine-doped tin oxide (FTO), nano silver wires, graphene, carbon nanotubes, metal grids or silver nanoparticles combination.

Preferably, the materials of the first bus bar and the second bus bar are independently metal materials with high conductivity, such as conductive silver paste, conductive copper paste, conductive carbon paste, nano-silver conductive ink, copper foil , copper wire or conductive adhesive film, or a combination of at least two; more preferably conductive silver paste.

Preferably, the color-changing layer includes an electrochromic layer, an electrolyte layer and an ion storage layer arranged in sequence.

In the present invention, the materials of the electrochromic layer, the electrolyte layer and the ion storage layer can be materials known in the prior art. Exemplarily, the material of the electrochromic layer can be specifically selected from color-changing materials capable of forming solid thin films in the prior art, such as NiO, WO ₃ , Nb ₂ O ₅ , TiO ₂ among inorganic materials; organic materials Polythiophene derivatives and copolymer systems, etc.; metal conjugated systems, such as Prussian blue, etc. The electrolyte layer is preferably a solid electrolyte layer, which is formed by solidifying the electrolyte solution, and the material of the electrolyte layer includes a mixture of polymers, metal ion salts and additives. The material of the ion storage layer includes a metal oxide formed by any one or at least two metal elements in Groups 4 to 12, or a mixture of metal oxides, or a metal oxide doped by any other metal oxide things.

Preferably, the first bus bar is disposed between the first substrate and the first conductive layer, or between the first conductive layer and the color-changing layer; more preferably, the first conductive layer and the color-changing layer.

Preferably, the second bus bar is disposed between the second substrate and the second conductive layer, or between the second conductive layer and the color-changing layer; more preferably, the second conductive layer and the color-changing layer.

Preferably, the projection of the first bus bar on the first conductive layer does not coincide with the projection of the second bus bar on the first conductive layer. Here, non-overlapping means at least incomplete overlapping. Thus, the occurrence of short circuit due to contact between the first bus bar and the second bus bar can be reduced.

Preferably, the width of the first bus bar is equal to that of the second bus bar. More preferably, the graphic structure of the first closed area is exactly the same as that of the second closed area. Here, the so-called identical graphic structure means that the shapes and structures of the first closed area and the second closed area are exactly the same, but they may not necessarily coincide completely. The projections of the two on the same plane (such as the first conductive layer) are After being optionally rotated by a certain angle and/or displaced by a certain distance, they can be completely aligned; for example, the first closed area and the second closed area are both irregular figures, and they need to be rotated by a certain angle to be completely aligned. Thus, on the one hand, it is possible to ensure that the material areas of the first bus bar and the second bus bar are equal to avoid waste of materials; on the other hand, in the preparation process, there is no need to separately arrange bus bars parameters such as the amount of material used, and the same bus bar pattern can be applied to two conductive layers at the same time without separate design, thereby simplifying the manufacturing process.

Preferably, both the first closed area and the second closed area are convex structures. Therefore, it is more convenient to form the same pattern structure, and make the overlapping area of projection after alignment smaller, so as to reduce the risk of short circuit due to contact between the first bus bar and the second bus bar, and improve the use of electrochromic devices stability and reliability.

Preferably, the projection of the symmetry axis of the first closed area on the first conductive layer is completely coincident with the projection of the symmetry axis of the second closed area on the first conductive layer. More preferably, the projection of the shoulder center of the convex structure of the first closed area on the first conductive layer is the same as the projection of the shoulder center of the convex structure of the second closed area on the first conductive layer. The projections on . Wherein, the "shoulder of the convex structure" means a position where the size (diameter) of the "convex" structure changes in a direction perpendicular to its axis of symmetry. Thus, through the coincidence of the symmetry axis of the closed area and the coincidence of the center of the shoulder, the overlapping area of the projections of the first bus bar and the second bus bar can be minimized, and at the same time, the overlap of the first closed area and the second closed area can be achieved. The maximization of the area can not only reduce the risk of short circuit due to bus bar contact, but also increase the discoloration area of the electrochromic device and improve the practicability of the electrochromic device.

Preferably, both the first closed area and the second closed area have a rectangular structure, more preferably a square structure. Since the area of the first closed area is equal to the area of the second closed area, and the projection of the first bus bar on the first conductive layer is the same as that of the second bus bar on the first conductive layer The projections of do not overlap, therefore, the projection of the first closed area on the first conductive layer and the projection of the second closed area on the first conductive layer are partially staggered.

Preferably, the electrochromic device further includes: a first extraction electrode connected to the first bus bar; a second extraction electrode connected to the second bus bar. Thus, the bus bar can be electrically connected to the external power supply through the lead-out electrode, and a voltage is applied through the external power source, and the current is conducted to the bus bar through the lead-out electrode, and the bus bar is then conducted to the conductive layer to form an electric field inside the electrochromic device , causing coloring or decolorization of the electrochromic device.

Preferably, the first lead-out electrode is connected to the first bus bar through conductive glue; the second lead-out electrode is connected to the second bus bar through conductive glue. Therefore, the stable connection between the lead-out electrodes and the bus bars can be realized more conveniently and effectively.

Preferably, the first bus bar and the second bus bar are electrically connected to an external power supply through the first lead-out electrode and the second lead-out electrode respectively; for example, the substrate, conductive layer, After the color-changing layer, the electrolyte layer and the ion storage layer, the first lead-out electrode and the second lead-out electrode are respectively connected to the first bus bar and the second bus bar through conductive glue.

Preferably, the projection of the first lead-out electrode on the first conductive layer is not in contact with the projection of the second bus bar on the first conductive layer; A projection on a conductive layer is not in contact with a projection of the first bus bar on the first conductive layer. Thus, on the one hand, the first lead-out electrode is drawn from the outer side of the first bus bar, and the second lead-out electrode is drawn from the outer side of the second bus bar, and each of the two lead-out electrodes does not need to cross the bus bar on the other side. (For example, the first lead-out electrode does not need to cross the second bus bar, and the second lead-out electrode does not need to cross the first bus bar), avoiding the short circuit caused by the lead-out electrode contacting the bus bar on the other side, and improving the reliability of the device ; that is, when connecting the lead-out electrode, because the lead-out electrode does not coincide with the projection of the bus bar on the other side, that is, there is no risk of contact short circuit, so there is no need to interrupt the bus bar on the other side (for example, remove the bus bar that coincides with the projection of the lead-out electrode) part), so as to effectively avoid the risk of short circuit and simplify the device manufacturing process; on the other hand, because there is no need to interrupt the bus bars on either side, that is, there is no need to interrupt the first bus bar and the second bus bar, so that Ensure the uniformity and consistency of electrical conduction everywhere on the bus bar, so as to ensure the uniformity and consistency of the discoloration rate of the electrochromic device, and help to further increase the electrical conduction rate (if the bus bar is interrupted, its electrical conduction rate will be affected), which increases the discoloration rate of the electrochromic device.

Preferably, the first extraction electrode and the second extraction electrode are arranged on the same side of the electrochromic device. Thus, the two lead-out electrodes can be led out from the same side, and the symmetry of the lead-out positions (that is, at the same horizontal or vertical height) can be ensured, which facilitates the access of an external power source and simplifies the manufacturing process. Moreover, in the case that the extraction electrodes need to be shielded, the extraction electrodes are located on the same side of the electrochromic device, and the shielding area can only be set on one side of the device, thereby simplifying the setting of the shielding area and reducing the shadowing. The setting area of the region can effectively increase the effective utilization area of the electrochromic device, such as realizing the effect of narrow borders of the mobile terminal.

As mentioned above, when the extraction electrode is set, the substrate, conductive layer, electrochromic layer, electrolyte layer and ion storage layer on the opposite side are usually cut off by a laser half-cutting process; as a preferred technical solution of the present invention, the first sealing Both the region and the second closed region have a convex structure. When the lead-out electrode is set, the bus bar on the other side can be avoided during laser half-cutting (for example, when the bus bar is laid out in the shape of a zigzag, the laser half-cutting process will cut off the bus bar). part of the bus bar that should not be cut off, so that the bus bar forms a broken area, which affects the current conduction efficiency, thereby affecting the discoloration rate), thereby preventing the current conduction efficiency from being affected, and further ensuring that the discoloration efficiency of the electrochromic device is high enough .

Preferably, the corners of the first bus bar are all set as first rounded corners. More preferably, the difference between the outer radius and the inner radius of the first rounded corner is equal to the width of the first bus bar.

Preferably, the corners of the second bus bar are all set as second rounded corners. More preferably, the difference between the outer radius and the inner radius of the second rounded corner is equal to the width of the second bus bar.

In the prior art, in the bus bars arranged in the shape of "back", the corners of the bus bars are usually at right angles, so that in the conductive area including the corners, the width of the bus bars at the corners is greater than the width of the bus bars at the non-corners , leading to the concentration of current at the corner of the bus bar (higher than that at the non-corner). During long-term use, it is easy to cause the conductive layer in this area to suffer from excessive current for a long time and fail, that is, the conductive layer (discoloration layer) in the corner area If the current is too high for a long time, it will be damaged and fail, which will affect the overall reliability of the device. For this reason, as a preferred technical solution of the present invention, the corners of the first bus bar and/or the second bus bar are rounded, which can make the line width on the first bus bar and/or the second bus bar Equal, the current and divided voltage everywhere are basically consistent, and there will be no right-angle corner current concentration, which will cause the conductive layer in the right-angle edge area to be damaged due to long-term excessive current, so as to improve the reliability and stability of the device. sex and longevity.

Preferably, both the first closed area and the second closed area are convex structures, and the corners of the shoulders of the convex structures are rounded. As a result, the line widths on the first bus bar and the second bus bar can be equal everywhere, and the current and divided voltage are basically the same everywhere, so as to avoid the current concentration at the right-angle corners and cause the conductive layer in the right-angle edge area to withstand too much for a long time. In case of damage due to current, to improve the reliability and stability of the device and prolong the life of the device.

Preferably, the difference between the outer radius and the inner radius of the rounded corner is equal to the width of the bus bar.

Preferably, an insulating protective layer is provided on the first bus bar and/or the second bus bar; more preferably, the shoulder area of the convex structure of the first bus bar and the second bus bar An insulating protective layer is provided. Thus, it is possible to effectively avoid the occurrence of a short circuit between the bus bar and the conductive layer on the other side; furthermore, for the convex structure, when the projected overlapping area of the bus bar is only the shoulder area, it can only be The insulating protective layer is provided in the shoulder area, which can effectively avoid the occurrence of contact short circuit, and at the same time effectively save the amount of insulating protective layer and save manufacturing costs.

Preferably, the insulating protection layer extends to the inner side (that is, the side away from the edge of the device) and has a specific width. Therefore, it is equivalent to setting a resistor with a larger resistance value between the conductive layer and the bus bar, so that the partial voltage on the bus bar and the insulating protection layer increases, while the partial voltage on the corresponding conductive layer becomes smaller, thus It can effectively prevent the problem of damage and failure of the conductive layer due to excessive voltage or current, and improve the reliability of the device. More preferably, the width of the connection between the insulating protective layer and the side of the conductive layer away from the edge is 1-3 cm, for example, it can be 1.1 cm, 1.3 cm, 1.5 cm, 1.7 cm, 1.9 cm, 2 cm, 2.1 cm, 2.3cm, 2.5cm, 2.7cm or 2.9cm etc. Thus, the insulating protection layer completely covers the bus bar, avoiding the problem of device damage and failure caused by the conductive layer in the area where the bus bar is subjected to excessive current for a long time, and further avoiding covering too many discolored areas to increase The discoloration area of the device improves the utilization rate of the electrochromic device.

In a second aspect, the present invention provides an electrochromic device, the electrochromic device comprising the electrochromic device as described in the first aspect.

Compared with the prior art, the present invention has the following beneficial effects:

In the electrochromic device provided by the present invention, the discoloration rate and discoloration uniformity of the device can be effectively improved through the design of the layout of the first bus bar and the second bus bar; meanwhile, the distance between the first closed area and the second closed area The area is equal, which not only ensures the same material area of the first bus bar and the second bus bar, prevents waste of materials, etc., but also simplifies the preparation process, reduces the difficulty of setting the lead-out electrodes, and reduces the number of lead-out electrodes, thereby improving the electromagnetism. The reliability and stability of the color-changing device prolong the working life of the device.

Description of drawings

Fig. 1 is the structural representation of the electrochromic device that embodiment 1 provides;

Fig. 2 is the structural representation of the electrochromic device that embodiment 2 provides;

Fig. 3 is the top view structure schematic diagram of the electrochromic device that embodiment 2 provides;

Fig. 4 is the top structural schematic diagram of the electrochromic device that embodiment 3 provides;

Fig. 5 is the schematic top view structural diagram of the electrochromic device that embodiment 4 provides;

Fig. 6 is the top view structure schematic diagram of the electrochromic device that comparative example 1 provides;

Among them, 11-first substrate, 12-second substrate, 21-first conductive layer, 22-second conductive layer, 30-color changing layer, 31-electrochromic layer, 32-electrolyte layer, 33-ion storage layer , 41-the first bus bar, 42-the second bus bar, 51-the first lead-out electrode, 52-the second lead-out electrode, AA'-the symmetry axis between the first closed area and the second closed area, BB'-the first The closed zone and the shoulder area of the second closed zone.

Detailed ways

The technical solutions of the present invention will be further described below through specific embodiments. It should be clear to those skilled in the art that the examples are only for helping to understand the present invention, and should not be regarded as specific limitations on the present invention.

In the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "vertical", "horizontal" etc. are based on the orientation or positional relationship shown in the accompanying drawings, and only In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features, which are used to describe the features differently, without order or importance. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the present invention, terms such as "connected", "connected", "installed" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, unless otherwise clearly specified and limited. Or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the above specific meanings in the present invention according to specific situations.

Example 1

A kind of electrochromic device, its structure diagram as shown in Figure 1, comprises the first substrate 11 that is arranged in sequence, the first conductive layer 21, color-changing layer 30, the second conductive layer 22, the second substrate 12; The first The conductive layer 21 is surrounded by a first bus bar 41, and the first bus bar 41 is arranged between the first conductive layer 21 and the discoloration layer 30; the second conductive layer 22 is surrounded by a second A bus bar 42, and the second bus bar 42 is arranged between the second conductive layer 22 and the discoloration layer 30; the first bus bar 41 forms a first closed area, and the second bus bar 42 forms a second closed area area; the area of the first closed area is equal to that of the second closed area.

In the electrochromic device provided in this embodiment, the first bus bar is arranged around the periphery of the first conductive layer, and the second bus bar is arranged around the periphery of the second conductive layer, which effectively improves the color change rate and color change uniformity of the device , which simplifies the lead-out method; at the same time, the first bus bar and the second bus bar respectively form a closed figure, and the areas of the two are equal, which not only makes the material area of the first bus bar and the second bus bar consistent, and prevents material waste, etc., Moreover, the preparation process is simplified, and the reliability of the electrochromic device is improved.

Example 2

A kind of electrochromic device, its structure schematic diagram as shown in Figure 2, comprises the first substrate 11 that is arranged in sequence, the first conductive layer 21, color-changing layer, the second conductive layer 22, the second substrate 12; Described color-changing layer comprises The electrochromic layer 31, the electrolyte layer 32 and the ion storage layer 33 arranged in sequence; the first bus bar 41 is arranged around the first conductive layer 21, and the first bus bar 41 is arranged on the first conductive layer 21 and the electrochromic layer 31; the second bus bar 42 is arranged around the second conductive layer 22, and the second bus bar 42 is arranged between the second conductive layer 22 and the ion storage layer 33 ; The first lead-out electrode 51 is connected to the first bus bar 41 through conductive glue, and the second lead-out electrode 52 is connected to the second bus bar 42 through conductive glue (not shown in FIG. 2 ).

The schematic diagram of the top view structure of the electrochromic device is shown in Figure 3, the first bus bar 41 forms a first closed area, and the second bus bar 42 forms a second closed area; the first closed area and the second closed area The two closed areas are identical "convex" structures, the areas of the two are equal, the projections of the axis of symmetry AA' of the two on the first conductive layer 21 coincide, and the center of the shoulder area BB' is on the first conductive layer 21 The projections on also coincide.

The first bus bar 41 and the second bus bar 42 have the same width, the corners of the two bus bars are rounded, and the corners of the shoulders of the convex structure are rounded.

The projection of the first lead-out electrode 51 on the first conductive layer 21 is not in contact with the projection of the second bus bar 42 on the first conductive layer 21 , and the second lead-out electrode 52 is on the first conductive layer 21 The projection on the first bus bar 41 and the projection on the first conductive layer 21 are not in contact with each other; that is, the extraction positions of the first extraction electrode 51 and the second extraction electrode 52 are on the same side of the electrochromic device, and have symmetry , each without crossing the bus bar on the other side.

The electrochromic device provided in this embodiment, through the design of the layout of the first bus bar and the second bus bar, not only has a high color change rate and uniformity of color change, but also ensures that the first bus bar and the second bus bar The area of the material used is consistent, preventing material waste, etc., and in the preparation process of the bus bar, there is no need to set the parameters such as the amount of bus bar material, and the same structural pattern can be applied to two conductive layers at the same time, without separate design, which simplifies preparation process; moreover, the first bus bar and the second bus bar respectively forming a closed pattern only need two lead-out electrodes, which reduces the difficulty of setting the lead-out electrodes and reduces the number of lead-out electrodes, thereby improving the reliability of the electrochromic device; Furthermore, the two lead-out electrodes do not need to cross the bus bar on the other side, avoiding the short circuit caused by the lead-out electrodes contacting the bus bar at the other end, and improving the reliability of the device; when the laser half-cuts the lead-out electrode , the bus bar on the other side will not be interrupted, so that the electrical conduction rate can be further improved, and the discoloration rate of the electrochromic device can be improved. In addition, the corners of the first bus bar and the second bus bar, and the corners of the shoulders of the convex structure are all rounded, so that the line widths of the first bus bar and the second bus bar are equal everywhere, and the The current and the divided voltage are basically the same, avoiding the situation where the current concentration at the right-angled corner causes the conductive layer in the right-angled edge area to withstand excessive current and be damaged, so as to improve the reliability and stability of the device and prolong the life of the device.

Example 3

An electrochromic device, its top view structure schematic diagram is shown in Figure 4, the only difference from Embodiment 2 is that the graphic structures of the first closed area and the second closed area are rectangular, and their areas are equal, and the two are in the second The projection on a conductive layer 21 is partially staggered in alignment. The first lead-out electrode 51 is connected to the first bus bar 41 through conductive glue, and the second lead-out electrode 52 is connected to the second bus bar 42 through conductive glue. Here, in order to avoid electrical contact between the second lead-out electrode 52 and the first bus bar 41 , the area overlapping with the projection of the second lead-out electrode 52 may be removed by breaking the first bus bar 41 . An insulating layer may also be provided on the side of the second lead-out electrode 52 facing the first bus bar 41 to avoid electrical contact between the two, and there is no need to interrupt the first bus bar 41, thereby further ensuring the bus bar electrical connection. The rate of conduction ensures that the discoloration rate of the electrochromic device is not affected.

In the electrochromic device provided in this embodiment, the first bus bar is arranged around the periphery of the first conductive layer, and the second bus bar is arranged around the periphery of the second conductive layer, which effectively improves the color change rate and color change uniformity of the device , at the same time, the two bus bars only need two lead-out electrodes, which greatly simplifies the lead-out method; moreover, the first bus bar and the second bus bar respectively form closed figures, and the areas of the two are equal, which not only makes the first bus bar and the second bus bar The material area of the two bus bars is the same to prevent material waste, etc., and the closed figure and bus bar with the same area do not need to set the parameters such as the amount of bus bar material separately during the preparation process of the bus bar, and the same structural pattern can be It is applied to two conductive layers at the same time without separate design, which simplifies the preparation process and improves the reliability of the electrochromic device.

Example 4

An electrochromic device, its top view structural diagram is shown in Figure 5, the only difference from Embodiment 3 is that the setting position of the second extraction electrode 52 is different; the first extraction electrode 51 is on the first conductive layer 21 The projection of the second lead-out electrode 52 on the first conductive layer 21 is not in contact with the projection of the second bus bar 42 on the first conductive layer 21, and the projection of the second lead-out electrode 52 on the first conductive layer 21 is not in contact with the first bus bar 41 on the first conductive layer. The projections on 21 do not touch each other.

In the electrochromic device provided in this embodiment, the leading positions of the first lead-out electrode and the second lead-out electrode are on the same side of the electrochromic device, and each does not need to cross the bus bar on the other side, avoiding the connection between the lead-out electrode and the second lead-out electrode. The short circuit and other situations that occur due to the contact of the bus bar at the other end further improve the stability and reliability of the device.

Comparative example 1

An electrochromic device, the schematic diagram of its top view structure is shown in Figure 6, the only difference from Embodiment 2 is that the graphic structures of the first closed area and the second closed area are two rectangles with different areas, that is, the first confluence The projection of the bar 41 on the first conductive layer 21 and the projection of the second bus bar 42 on the first conductive layer 21 form a "back" shape.

Compared with Example 1, the layout of the bus bars in Comparative Example 1 will cause the corresponding areas of the first bus bar and the second bus bar to be unequal, so that the parameters of the amount of bus bar materials need to be set separately during the preparation of the device. It is complicated and causes waste of redundant materials around; further, when the "back"-shaped bus bar is connected to the lead-out electrode, the second lead-out electrode drawn from the inner side will inevitably contact the first bus bar on the outer side, which will easily lead to a short circuit. resulting in reduced reliability of the device.

The applicant declares that the present invention illustrates an electrochromic device and its application through the above examples, but the present invention is not limited to the above process steps, that is, it does not mean that the present invention must rely on the above process steps to be implemented. Those skilled in the art should understand that any improvement of the present invention, the equivalent replacement of the selected raw materials in the present invention, the addition of auxiliary components, the selection of specific methods, etc., all fall within the scope of protection and disclosure of the present invention.

Claims (10)

1. An electrochromic device, characterized in that, comprising: first base; a first conductive layer disposed on the first substrate; a first bus bar, which is disposed on the first conductive layer and located around the first conductive layer, so as to form a first enclosed area on the first conductive layer; a color-changing layer, which is disposed on the first conductive layer and away from the first substrate; a second conductive layer, which is disposed on the color-changing layer and away from the first conductive layer; The second bus bar is arranged on the second conductive layer and is located around the second conductive layer to form a second closed area on the second conductive layer; the area of the second closed area equal to the area of the first enclosed area; The second base is arranged on the second conductive layer and is away from the color-changing layer. 2. The electrochromic device according to claim 1, wherein the projection of the first bus bar on the first conductive layer is the same as the projection of the second bus bar on the first conductive layer. The projections do not coincide; Preferably, the width of the first bus bar is equal to that of the second bus bar; Preferably, the graphic structure of the first closed area is exactly the same as that of the second closed area. 3. The electrochromic device according to claim 1 or 2, characterized in that, both the first closed area and the second closed area have a convex structure; Preferably, the projection of the symmetry axis of the first enclosed area on the first conductive layer is completely coincident with the projection of the symmetry axis of the second enclosed area on the first conductive layer; Preferably, the projection of the shoulder center of the convex structure of the first closed area on the first conductive layer is the same as the projection of the shoulder center of the convex structure of the second closed area on the first conductive layer projection coincidence. 4. The electrochromic device according to claim 1 or 2, characterized in that, both the first closed area and the second closed area have a rectangular structure, preferably a square structure. 5. The electrochromic device according to any one of claims 1 to 4, further comprising: a first extraction electrode connected to the first bus bar; a second extraction electrode connected to the second bus bar; Preferably, the first lead-out electrode is connected to the first bus bar through conductive glue; the second lead-out electrode is connected to the second bus bar through conductive glue. 6. The electrochromic device according to claim 5, wherein the projection of the first extraction electrode on the first conductive layer is the same as the projection of the second bus bar on the first conductive layer. The projections are not in contact with each other; the projections of the second extraction electrode on the first conductive layer and the projections of the first bus bar on the first conductive layer are not in contact with each other; Preferably, the first extraction electrode and the second extraction electrode are arranged on the same side of the electrochromic device. 7. The electrochromic device according to any one of claims 1 to 6, characterized in that, the corners of the first bus bar are all set as first rounded corners; Preferably, the difference between the outer radius and the inner radius of the first rounded corner is equal to the width of the first bus bar; Preferably, the corners of the second bus bar are all set as second rounded corners; Preferably, the difference between the outer radius and the inner radius of the second rounded corner is equal to the width of the second bus bar. 8. The electrochromic device according to any one of claims 1 to 7, characterized in that, both the first closed area and the second closed area are convex structures, and the shoulders of the convex structures The corners are all rounded. 9. The electrochromic device according to any one of claims 1-8, characterized in that an insulating protective layer is disposed on the first bus bar and/or the second bus bar. 10. An electrochromic device, characterized in that the electrochromic device comprises the electrochromic device according to any one of claims 1-9.

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