CN116068822A - Electrochromic device and application thereof - Google Patents

Abstract

The invention provides an electrochromic device and application thereof, comprising: a first substrate; a first conductive layer disposed on the first substrate; the first bus bar is arranged on the first conductive layer and positioned around the first conductive layer so as to form a first sealing area on the first conductive layer; the color-changing layer is arranged on the first conductive layer and is far away from the first substrate; the second conductive layer is arranged on the color-changing layer and is far away from the first conductive layer; the second bus bar is arranged on the second conductive layer and positioned around the second conductive layer so as to form a second sealing area on the second conductive layer; the area of the second closed area is equal to that of the first closed area; the second substrate is arranged on the second conductive layer and is far away from the color-changing layer. According to the invention, through the design of the arrangement modes of the first bus bar and the second bus bar, on one hand, the color change rate of the device is effectively improved, on the other hand, the material waste is avoided, the preparation and extraction processes of the device are simplified, and the use reliability of the device is improved.

Description

Electrochromic device and application thereof

Technical Field

The invention belongs to the technical field of color-changing display, and particularly relates to an electrochromic device and application thereof.

Background

Electrochromic phenomenon refers to a phenomenon that under the action of an external electric field and current, a material generates reversible oxidation-reduction reaction, so that the structure of the material is changed, and further the absorption spectrum or optical properties (such as transmissivity, absorptivity and reflectivity) of the material are changed, and the material shows reversible change of color or transparency in appearance. Currently, electrochromic devices have been widely used in the fields of energy saving windows, automobile rearview mirrors, display devices, and the like.

A common electrochromic device is generally composed of a substrate layer, a conductive layer, a color-changing active material layer, a conductive layer and a substrate layer which are sequentially laminated, wherein the color-changing active material layer comprises an electrochromic material layer, an electrolyte layer, an ion storage layer and the like; and the conducting layer is provided with and connected with a lead-out structure to realize the electric connection between an external power supply and the electrochromic device.

Many researchers have been working on the development of novel electrochromic devices and electrochromic devices, for example CN213365229U discloses an electrochromic device comprising a first conductive layer, an electrochromic layer, a second conductive layer and a lead-out electrode, the first conductive layer, the electrochromic layer and the second conductive layer being stacked; the first conductive layer comprises a first overlapping region and a first staggered region, the second conductive layer comprises a second overlapping region and a second staggered region, at least part of the first staggered region and the second staggered region are positioned on the same side of the electrochromic layer, the first conductive layer is provided with a first bus bar, the second conductive layer is provided with a second bus bar, and the extraction electrode is respectively communicated with the first bus bar and the second bus bar. CN112513726a discloses an apparatus comprising an electrochromic device, comprising a first bus bar electrically coupled to a first transparent conductive layer; a second bus bar electrically coupled to the second transparent conductive layer, the second bus bar being 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 having at least three sides and an active stack on the substrate, the active stack comprising a first transparent conductive layer, a second transparent conductive layer, an anode electrochemical layer and a cathode electrochemical layer; further included is a first bus bar set including a plurality of bus bars, each bus bar electrically coupled to the first transparent conductive layer; a second bus bar set comprising a plurality of bus bars and each bus bar electrically coupled to the second transparent conductive layer; and a busbar arrangement comprising busbars from the first busbar group and busbars from the second busbar group on at least three sides of the substrate.

Generally, in order to have better electrochromic rate, in particular to the large-size field such as electrochromic windows, the electrochromic device in the prior art is generally provided with a plurality of sections of bus bars, the bus bar arrangement mode adopts a 'back' shape arrangement mode (namely, the 'opening' shape bus bars with different sizes are respectively arranged on the upper conductive layer and the lower conductive layer, the 'opening' is combined to form an inner ring and an outer ring by itself after the combination to form a 'back' shape structure) or a staggered multi-section arrangement mode (namely, the periphery of the upper conductive layer is respectively provided with a plurality of sections of bus bars, gaps are reserved between each section of bus bars, and the sections of bus bars are also arranged at the positions of the bus bar gaps corresponding to the upper conductive layer on the lower conductive layer). The bus bars are arranged in a mode that the corresponding areas of the upper conductive layer and the lower conductive layer are different, so that not only is the waste of peripheral redundant materials caused, but also instrument parameters are required to be set respectively corresponding to different structures of the upper bus bars and the lower bus bars when the bus bars are prepared, and the operation process is more complicated; meanwhile, in the staggered multi-section layout mode, each section of bus bar is required to be connected with the extraction electrode, so that the defects of more extraction electrodes, instability, difficulty in maintenance and the like exist, and the defects can lead to insufficient reliability of the device.

Therefore, on the premise of keeping high color-changing efficiency, development of an electrochromic device which is free of material waste, simple in extraction mode, not easy to short circuit and high in reliability is an important research point in the field.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide an electrochromic device and application thereof, and through the design of the arrangement mode of a first bus bar and a second bus bar, on one hand, the color changing rate of the device is effectively improved, on the other hand, the material waste is avoided, the preparation and extraction process of the device is simplified, and the use reliability of the device is improved.

In order to achieve the aim of the invention, the invention adopts the following technical scheme:

in a first aspect, the present invention provides an electrochromic device comprising: a first substrate; a first conductive layer disposed on the first substrate; the first bus bar is arranged on the first conductive layer and is positioned at the periphery of the first conductive layer so as to form a first sealing area on the first conductive layer; the color-changing layer is arranged on the first conductive layer and is far away from the first substrate; the second conductive layer is arranged on the color-changing layer and is far away from the first conductive layer; the second bus bar is arranged on the second conductive layer and is positioned at the periphery of the second conductive layer so as to form a second sealing area on the second conductive layer; the second substrate is arranged on the second conductive layer and is far away from the color-changing layer. Preferably, the area of the second enclosed region is equal to the area of the first enclosed region.

In the electrochromic device provided by the invention, the first bus bar is arranged around the first conductive layer to form a closed pattern, namely the first closed region; the second bus bar is arranged around the second conductive layer to form a closed graph, namely the second closed area, and the mode that the bus bars are arranged on the four peripheries of the conductive layer can effectively improve the color changing rate of the electrochromic device; further, the areas of the first sealing area and the second sealing area are equal, so that the material areas of the first bus bar and the second bus bar are consistent, material waste and the like are prevented, parameters such as the material consumption of the bus bar are not required to be set in the process of preparing the bus bars, and the preparation process is simplified; and moreover, the first bus bar and the second bus bar which form closed patterns respectively obviously reduce the setting difficulty of the extraction electrodes and reduce the number of the extraction electrodes, thereby improving the use reliability, stability and the like of the electrochromic device.

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 ), cyclic olefin copolymer, cellulose triacetate, or the like. Therefore, the optical property of the electrochromic device can be changed through the transparent substrate, and a proper substrate material can be selected according to the requirements of application scenes, so that the applicability of the electrochromic device is improved.

Preferably, the materials of the first conductive layer and the second conductive layer are transparent conductive materials for exhibiting a change in optical properties of the electrochromic device, and the materials are conductive materials known in the art, including but not limited to any one or a combination of at least two of Indium Tin Oxide (ITO), aluminum Zinc Oxide (AZO), fluorine doped tin oxide (FTO), nano-silver wires, graphene, carbon nanotubes, metal grids, or silver nanoparticles.

Preferably, the materials of the first bus bar and the second bus bar are respectively and independently metal materials with higher conductivity, such as any one or a combination of at least two of conductive silver paste, conductive copper paste, conductive carbon paste, nano-silver conductive ink, copper foil, copper wire or conductive adhesive film; further preferred is a conductive silver paste.

Preferably, the color-changing layer includes an electrochromic layer, an electrolyte layer, and an ion storage layer, which are sequentially disposed.

In the present invention, materials of the electrochromic layer, the electrolyte layer and the ion storage layer may be materials known in the art. The electrochromic layer material may be selected from among solid film-forming color-changing materials in the prior art, such as NiO in inorganic materials, WO ₃ 、Nb ₂ O ₅ 、TiO ₂ Etc.; polythiophene derivatives and copolymer systems in organic materials, and the like; metal conjugated systems such as Prussian blue and the like. The electrolyte layer is preferably a solid electrolyte layer, the solid electrolyte layer is formed by solidifying electrolyte solution, and the electrolyte layer is formed by mixing high molecular polymer, metal ion salt and additive. The material of the ion storage layer comprises metal oxide formed by any one or at least two metal elements in groups 4-12, or a mixture of metal oxides, or metal oxide doped by any other metal oxide.

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 change layer; further preferably between 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 change layer; further preferably between the second conductive layer and the color-changing layer.

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

Preferably, the first bus bar and the second bus bar have the same width. More preferably, the graphic structure of the first enclosed region and the graphic structure of the second enclosed region are identical. The graphic structures are identical, which means that the shape and structure of the first enclosed area and the second enclosed area are identical, but not necessarily can be completely matched, and the projections of the first enclosed area and the second enclosed area on the same plane (such as the first conductive layer) can be completely matched after being optionally rotated for a certain angle and/or displaced for a certain distance; for example, the first sealing area and the second sealing area are irregular patterns, and the first sealing area and the second sealing area are required to rotate correspondingly by a certain angle to be completely closed. Therefore, on one hand, the material utilization areas of the first bus bar and the second bus bar can be ensured to be equal, and material waste and the like are avoided; on the other hand, the closed patterns and the bus bars with equal areas do not need to be respectively provided with parameters such as the consumption of bus bar materials and the like in the preparation process, and the same bus bar pattern can be simultaneously applied to two conductive layers without being respectively designed, so that the preparation process can be simplified.

Preferably, the first and second enclosed regions are each of convex configuration. Therefore, the structure of the patterns can be more conveniently and quickly formed, and the overlapping area of the projection after involution is smaller, so that the risk of short circuit of the first bus bar and the second bus bar due to contact is reduced, and the use stability and reliability of the electrochromic device are improved.

Preferably, the projection of the symmetry axis of the first enclosed region onto the first conductive layer is completely coincident with the projection of the symmetry axis of the second enclosed region onto the first conductive layer. More preferably, the projection of the shoulder center of the convex structure of the first enclosed region onto the first conductive layer coincides with the projection of the shoulder center of the convex structure of the second enclosed region onto the first conductive layer. Wherein the "shoulder of the male structure" means a position in the "male" structure where a dimension (diameter) in a direction perpendicular to an axis of symmetry thereof changes. Therefore, through the superposition of symmetry axes of the closed areas and the superposition of the shoulder centers, the superposition area of the projection of the first bus bar and the projection of the second bus bar can be minimized, and meanwhile, the superposition area of the first closed area and the second closed area can be maximized, so that the danger of short circuit caused by bus bar contact can be reduced, the color change area of the electrochromic device can be increased, and the practicability of the electrochromic device is improved.

Preferably, the first enclosed region and the second enclosed region are each rectangular in structure, and further preferably square in structure. Because the area of the first sealing area is equal to the area of the second sealing area, and the projection of the first bus bar on the first conductive layer is not overlapped with the projection of the second bus bar on the first conductive layer, the projection of the first sealing area on the first conductive layer and the projection of the second sealing area on the first conductive layer are partially staggered and aligned.

Preferably, the electrochromic device further comprises: a first extraction electrode connected to the first bus bar; and a second extraction electrode connected to the second bus bar. Therefore, the bus bar and an external power supply can be electrically connected through the extraction electrode, voltage is applied through the external power supply, current is conducted to the bus bar through the extraction electrode, and the bus bar is conducted to the conductive layer, so that an electric field is formed inside the electrochromic device, and the electrochromic device is colored or decolored.

Preferably, the first extraction electrode is connected with the first bus bar through conductive adhesive; the second extraction electrode is connected with the second bus bar through conductive adhesive. Therefore, stable connection between the extraction electrode and the bus bar can be realized more conveniently and effectively.

Preferably, the first bus bar and the second bus bar are electrically connected with an external power supply through a first extraction electrode and a second extraction electrode, respectively; illustratively, after the partial areas of the substrate, the conductive layer, the electrochromic layer, the electrolyte layer, and the ion storage layer are half-cut by a laser, the first extraction electrode and the second extraction electrode are connected to the first bus bar and the second bus bar, respectively, by a conductive paste.

Preferably, the projection of the first extraction electrode on the first conductive layer and the projection of the second bus bar on the first conductive layer are not in contact with each other; the projection of the second extraction electrode on the first conductive layer is not contacted with the projection of the first bus bar on the first conductive layer. Therefore, on one hand, the first extraction electrode is extracted from the position, which is close to the outer side, of the first bus bar, the second extraction electrode is extracted from the position, which is close to the outer side, of the second bus bar, and the two extraction electrodes do not need to cross the bus bar on the other side (for example, the first extraction electrode does not need to cross the second bus bar, and the second extraction electrode does not need to cross the first bus bar), so that the conditions of short circuit and the like caused by contact between the extraction electrode and the bus bar on the other side are avoided, and the use reliability of the device is improved; namely, when the extraction electrode is connected, the projection of the extraction electrode is not coincident with the projection of the bus bar at the other side, namely, the risk of contact short circuit is avoided, so that the bus bar at the other side is not required to be broken (for example, the part of the bus bar which is coincident with the projection of the extraction electrode is removed), the risk of short circuit can be effectively avoided, and the preparation process of the device is simplified; on the other hand, the bus bar on any side is not required to be broken, namely the first bus bar and the second bus bar are not required to be broken, so that uniformity and consistency of electric conduction on the bus bar can be guaranteed, uniformity and consistency of the color change rate of the electrochromic device are guaranteed, further improvement of the electric conduction rate (the electric conduction rate of the electrochromic device is influenced if the bus bar is broken) is facilitated, and the color change rate of the electrochromic device is improved.

Preferably, the first extraction electrode and the second extraction electrode are disposed on the same side of the electrochromic device. Therefore, the two extraction electrodes can be extracted from the same side, and the symmetry of extraction positions (namely the same horizontal height or vertical height) can be ensured, so that the connection of an external power supply is facilitated, and the preparation process is simplified. In addition, under the condition that the extraction electrode and the like are required to be shielded, the extraction electrode is positioned on the same side of the electrochromic device, and the shielding area can be arranged on one side of the device, so that the arrangement of the shielding area is simplified, the arrangement area of the shielding area is reduced, the effective utilization area of the electrochromic device can be effectively improved, and the effects of a narrow frame of a mobile terminal and the like are realized.

As previously described, when the extraction electrode is provided, the substrate, the conductive layer, the electrochromic layer, the electrolyte layer, and the ion storage layer on the opposite side are usually cut off by a laser half-cutting process; as a preferable technical scheme of the invention, the first sealing area and the second sealing area are of convex structures, when the extraction electrode is arranged, the bus bar on the other side can be prevented from being cut off when the laser is used for half-cutting (for example, when the bus bar is arranged in a shape like a Chinese character 'Hui', the laser half-cutting process can cut part of the bus bar which is not needed to be cut off, so that the bus bar forms a broken area, the current conduction efficiency is influenced, the color change rate is influenced), the current conduction efficiency is prevented from being influenced, and the color change efficiency of the electrochromic device is further ensured to be high enough.

Preferably, corners of the first bus bar are each provided with a first rounded corner. More preferably, the difference between the outside radius and the inside radius of the first rounded corner is equal to the width of the first bus bar.

Preferably, corners of the second bus bars are each provided with a second rounded corner. More preferably, the difference between the outside radius and the inside radius of the second rounded corner is equal to the width of the second bus bar.

In the prior art, in the bus bar with the mode of 'back' layout, the corners of the bus bar are usually right angles, so that in a conductive area containing the corners, the width of the bus bar at the corners is larger than that of the bus bar at the non-corners, the current at the corners of the bus bar is concentrated (higher than that at the non-corners), and in the long-term use process, the conductive layer in the area is easily caused to suffer excessive current for a long time to fail, namely, the current of the conductive layer (color-changing layer) at the corners is excessively high for a long time to be damaged and fail, so that the overall reliability of the device is affected. Therefore, as a preferred technical scheme of the invention, the corners of the first bus bar and/or the second bus bar are rounded, so that the line widths of the first bus bar and/or the second bus bar are equal everywhere, the current and the partial voltage at each place are basically consistent, and the situation that the conducting layer of the right-angle edge area is damaged due to overlarge current born by the right-angle corner current for a long time due to the concentration of the right-angle corner current is avoided, thereby improving the reliability, the service stability and the service life of the device.

Preferably, the first and second enclosed regions are each of a convex configuration, and the shoulder corners of the convex configuration are rounded. Therefore, line widths on the first bus bar and the second bus bar are equal everywhere, currents and partial voltages at all the positions are basically consistent, the situation that a conducting layer in a right-angle edge area is damaged due to overlarge current born for a long time due to the fact that right-angle corner currents are concentrated is avoided, reliability and use stability of a device are improved, and service life of the device is prolonged.

Preferably, the difference between the outside radius and the inside radius of the rounded corners is equal to the width of the bus bar.

Preferably, an insulating protection layer is arranged on the first bus bar and/or the second bus bar; more preferably, shoulder regions of the convex structures of the first and second bus bars are provided with insulating protective layers. Therefore, the occurrence of short circuit caused by the electric connection of the bus bar and the conductive layer on the other side can be effectively avoided; further, for the convex structure, when the projection overlapping area of the bus bar is only the shoulder area, the insulating protection layer can be arranged only in the shoulder area, so that the situation of contact short circuit is effectively avoided, the consumption of the insulating protection layer can be effectively saved, and the manufacturing cost is saved.

Preferably, the insulating protective layer extends inward (i.e., the side away from the edge of the device) and has a certain width. Therefore, the resistor with larger resistance is arranged between the conducting layer and the bus bar, so that the partial pressure on the bus bar and the insulating protection layer is increased, and the partial pressure on the corresponding conducting layer is reduced, thereby effectively preventing the problem of damage and failure caused by overlarge voltage or current of the conducting layer and improving 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 to 3cm, for example, 1.1cm, 1.3cm, 1.5cm, 1.7cm, 1.9cm, 2cm, 2.1cm, 2.3cm, 2.5cm, 2.7cm, 2.9cm, or the like. Therefore, the insulating protective layer completely covers the bus bar, the problem that the device is damaged and invalid due to the fact that the conducting layer in the area where the bus bar is located bears excessive current for a long time is avoided, too many color-changing areas are further avoided to be covered, the color-changing area of the device is increased, and the utilization rate of the electrochromic device is improved.

In a second aspect, the present invention provides an electrochromic device comprising an electrochromic device according to the first aspect.

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

according to the electrochromic device provided by the invention, through the design of the arrangement modes of the first bus bar and the second bus bar, the color changing rate and the color changing uniformity of the device can be effectively improved; meanwhile, the areas of the first sealing area and the second sealing area are equal, so that the material areas of the first bus bar and the second bus bar are guaranteed to be consistent, material waste and the like are prevented, the preparation process is simplified, the setting difficulty of the extraction electrodes is reduced, the number of the extraction electrodes is reduced, the reliability and the service stability of the electrochromic device are improved, and the service life of the device is prolonged.

Drawings

Fig. 1 is a schematic structural view of an electrochromic device provided in example 1;

fig. 2 is a schematic structural view of an electrochromic device provided in example 2;

fig. 3 is a schematic top view of the electrochromic device provided in example 2;

fig. 4 is a schematic top view of the electrochromic device provided in example 3;

fig. 5 is a schematic top view of the electrochromic device provided in example 4;

fig. 6 is a schematic top view of the electrochromic device provided in comparative example 1;

the device comprises a first substrate, a second substrate, a first conductive layer, a second conductive layer, a color-changing layer, an electrochromic layer, an electrolyte layer, a 33-ion storage layer, a first bus bar, a second bus bar, a first lead-out electrode, a second lead-out electrode, an axis of symmetry of an AA ' -first sealing region and a second sealing region, and a shoulder region of a BB ' -first sealing region and a second sealing region, wherein the first substrate, the second conductive layer, the first conductive layer, the second conductive layer, the color-changing layer, the electrochromic layer, the electrolyte layer, the 33-ion storage layer, the first bus bar, the second bus bar, the first lead-out electrode, the 52-out electrode, the AA ' -first sealing region and the second sealing region.

Detailed Description

The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.

In the present invention, the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, and are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.

Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly, for distinguishing between the descriptive features, and not sequentially, and not lightly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the present invention, unless explicitly specified and limited otherwise, terms such as "connected," "mounted," "secured," and the like are to be construed broadly and may be, for example, fixedly attached, detachably attached, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements or interaction relationship between the two elements. The above-described specific meanings belonging to the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.

Example 1

An electrochromic device is shown in fig. 1, and comprises a first substrate 11, a first conductive layer 21, a color-changing layer 30, a second conductive layer 22 and a second substrate 12 which are arranged in sequence; a first bus bar 41 is arranged around the first conductive layer 21, and the first bus bar 41 is arranged between the first conductive layer 21 and the color-changing layer 30; a second bus bar 42 is disposed around the second conductive layer 22, and the second bus bar 42 is disposed between the second conductive layer 22 and the color-changing layer 30; the first bus bar 41 constitutes a first enclosed region, and the second bus bar 42 constitutes a second enclosed region; the areas of the first sealing area and the second sealing area are equal.

In the electrochromic device provided by the embodiment, the first bus bar is arranged around the periphery of the first conductive layer, the second bus bar is arranged around the periphery of the second conductive layer, the color changing rate and the color changing uniformity of the device are effectively improved, and the lead-out mode is simplified; meanwhile, the first bus bar and the second bus bar respectively form closed patterns, the areas of the first bus bar and the second bus bar are equal, the material areas of the first bus bar and the second bus bar are consistent, material waste and the like are prevented, the preparation process is simplified, and the reliability of the electrochromic device is improved.

Example 2

An electrochromic device is shown in fig. 2, and comprises a first substrate 11, a first conductive layer 21, a color-changing layer, a second conductive layer 22 and a second substrate 12 which are arranged in sequence; the color-changing layer includes an electrochromic layer 31, an electrolyte layer 32, and an ion storage layer 33, which are sequentially disposed; a first bus bar 41 is arranged around the first conductive layer 21, and the first bus bar 41 is arranged between the first conductive layer 21 and the electrochromic layer 31; a second bus bar 42 is disposed around the second conductive layer 22, and the second bus bar 42 is disposed between the second conductive layer 22 and the ion storage layer 33; the first extraction electrode 51 is connected to the first bus bar 41 by conductive paste, and the second extraction electrode 52 is connected to the second bus bar 42 by conductive paste (not shown in fig. 2).

As shown in fig. 3, the schematic top view structure of the electrochromic device is shown, the first bus bar 41 forms a first enclosed area, and the second bus bar 42 forms a second enclosed area; the first sealing area and the second sealing area are of identical convex structures, the areas of the first sealing area and the second sealing area are equal, the projection of the symmetry axis AA 'of the first sealing area and the second sealing area on the first conductive layer 21 are overlapped, and the projection of the center of the shoulder area BB' on the first conductive layer 21 is also overlapped.

The width of the first bus bar 41 is the same as that of the second bus bar 42, the corners of the two bus bars are rounded, and the shoulder corners of the convex structure are rounded.

The projection of the first extraction electrode 51 on the first conductive layer 21 and the projection of the second bus bar 42 on the first conductive layer 21 are not contacted with each other, and the projection of the second extraction electrode 52 on the first conductive layer 21 and the projection of the first bus bar 41 on the first conductive layer 21 are not contacted with each other; i.e. 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 by the embodiment has the advantages that through the design of the layout mode of the first bus bar and the second bus bar, the high color changing rate and the high color changing uniformity are realized, meanwhile, the consistency of the material areas of the first bus bar and the second bus bar is ensured, the material waste and the like are prevented, in the preparation process of the bus bars, the parameters such as the consumption of bus bar materials and the like are not required to be set respectively, the same structural pattern can be simultaneously applied to two layers of conductive layers, the separate design is not required, and the preparation process is simplified; in addition, only 2 extraction electrodes are needed for respectively forming the first bus bar and the second bus bar with closed patterns, so that the setting difficulty of the extraction electrodes is reduced, the number of the extraction electrodes is reduced, and the reliability of the electrochromic device is improved; further, the two extraction electrodes do not need to cross the bus bar at the other side, so that the conditions of short circuit and the like caused by contact between the extraction electrodes and the bus bar at the other end are avoided, and the use reliability of the device is improved; when the laser half-cutting extraction electrode is carried out, the bus bar at the other side is not broken, so that the electric conduction rate can be further improved, and the color change rate of the electrochromic device can be improved. In addition, the corners of the first bus bar and the second bus bar and the shoulder corners of the convex structure are rounded corners, so that the line widths of the first bus bar and the second bus bar are equal everywhere, the current and the partial voltage of each place are basically consistent, the condition that the conducting layer in the right-angle edge area is damaged due to overlarge current when the right-angle corner current is concentrated is avoided, the reliability and the service stability of the device are improved, and the service life of the device is prolonged.

Example 3

An electrochromic device is shown in fig. 4, which is different from embodiment 2 only in that the pattern structures of the first sealing region and the second sealing region are rectangular, the areas are equal, and the projections of the first sealing region and the second sealing region on the first conductive layer 21 are partially staggered and aligned. The first extraction electrode 51 is connected to the first bus bar 41 by conductive paste, and the second extraction electrode 52 is connected to the second bus bar 42 by conductive paste. Here, to avoid electrical contact of the second extraction electrode 52 with the first bus bar 41, a region overlapping with the projection of the second extraction electrode 52 may be removed by breaking the first bus bar 41. An insulating layer may be provided on the side of the second extraction electrode 52 facing the first bus bar 41 to avoid electrical contact between the two, and the first bus bar 41 is not required to be broken, whereby the rate of bus bar electrical conduction can be further ensured, the rate of discoloration of the electrochromic device is ensured not to be affected, and the like.

In the electrochromic device provided by the embodiment, the first bus bar is arranged around the periphery of the first conductive layer, the second bus bar is arranged around the periphery of the second conductive layer, the color changing speed and the color changing uniformity of the device are effectively improved, and meanwhile, only two extraction electrodes are needed for the two bus bars, so that the extraction mode is greatly simplified; moreover, the first bus bar and the second bus bar respectively form closed patterns, the areas of the first bus bar and the second bus bar are equal, the material areas of the first bus bar and the second bus bar are consistent, material waste and the like are prevented, the closed patterns and the bus bars with equal areas are not required to be respectively provided with parameters such as the material consumption of the bus bars and the like in the preparation process of the bus bars, and the same structural pattern can be simultaneously applied to two layers of conducting layers without being respectively designed, so that the preparation process is simplified, and the reliability of the electrochromic device is improved.

Example 4

An electrochromic device, the schematic top view of which is shown in fig. 5, differs from embodiment 3 only in the arrangement position of the second extraction electrode 52; the projection of the first extraction electrode 51 onto the first conductive layer 21 and the projection of the second bus bar 42 onto the first conductive layer 21 are not in contact with each other, and the projection of the second extraction electrode 52 onto the first conductive layer 21 and the projection of the first bus bar 41 onto the first conductive layer 21 are not in contact with each other.

In the electrochromic device provided by the embodiment, the extraction positions of the first extraction electrode and the second extraction electrode are on the same side of the electrochromic device, and the first extraction electrode and the second extraction electrode do not need to cross the bus bar on the other side, so that the conditions of short circuit and the like caused by contact between the extraction electrode and the bus bar on the other end are avoided, and the stability and the use reliability of the device are further improved.

Comparative example 1

An electrochromic device is shown in fig. 6, and the difference between the schematic top view structure of the electrochromic device and embodiment 2 is that the pattern structure of the first enclosed area and the second enclosed area is 2 rectangles with different areas, namely, the projection of the first bus 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 the embodiment 1, the bus bars in the comparative example 1 are arranged in a manner that the corresponding areas of the first bus bar and the second bus bar are different, so that the device needs to set the consumption parameters of the bus bar materials respectively during the preparation, the process is complex, and the waste of the peripheral redundant materials is caused; further, when the lead-out electrode is connected to the back-shaped bus bar, the second lead-out electrode led out from the inner side inevitably contacts with the first bus bar on the outer side, which is likely to cause a short circuit, resulting in a reduction in the reliability of the device.

The applicant states that the invention is illustrated by the above examples as an electrochromic device and its use, but the invention is not limited to, i.e. does not mean that the invention has to be carried out in dependence of, the above process steps. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of selected raw materials, addition of auxiliary components, selection of specific modes, etc. fall within the scope of the present invention and the scope of disclosure.

Claims (10)

1. An electrochromic device comprising:

a first substrate;

a first conductive layer disposed on the first substrate;

the first bus bar is arranged on the first conductive layer and is positioned at the periphery of the first conductive layer so as to form a first sealing area on the first conductive layer;

the color-changing layer is arranged on the first conductive layer and is far away from the first substrate;

the second conductive layer is arranged on the color-changing layer and is far away from the first conductive layer;

the second bus bar is arranged on the second conductive layer and is positioned at the periphery of the second conductive layer so as to form a second sealing area on the second conductive layer; the area of the second closed area is equal to that of the first closed area;

the second substrate is arranged on the second conductive layer and is far away from the color-changing layer.

2. The electrochromic device according to claim 1, wherein the projection of the first bus bar onto the first conductive layer does not coincide with the projection of the second bus bar onto the first conductive layer;

preferably, the first bus bar and the second bus bar have the same width;

preferably, the graphic structure of the first enclosed area and the graphic structure of the second enclosed area are identical.

3. Electrochromic device according to claim 1 or 2, characterized in that the first and the second closing zone are each of convex configuration;

preferably, the projection of the symmetry axis of the first enclosed region on the first conductive layer is completely coincident with the projection of the symmetry axis of the second enclosed region on the first conductive layer;

preferably, the projection of the shoulder center of the convex structure of the first enclosed region onto the first conductive layer coincides with the projection of the shoulder center of the convex structure of the second enclosed region onto the first conductive layer.

4. Electrochromic device according to claim 1 or 2, characterized in that the first and the second closing area are each of rectangular, preferably square, construction.

5. The electrochromic device according to any one of claims 1-4, 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 extraction electrode is connected with the first bus bar through conductive adhesive; the second extraction electrode is connected with the second bus bar through conductive adhesive.

6. The electrochromic device according to claim 5, wherein the projection of the first extraction electrode onto the first conductive layer and the projection of the second bus bar onto the first conductive layer are not in contact with each other; the projection of the second extraction electrode on the first conductive layer is not contacted with the projection of the first bus bar on the first conductive layer;

preferably, the first extraction electrode and the second extraction electrode are disposed on the same side of the electrochromic device.

7. The electrochromic device according to any one of claims 1-6, wherein corners of the first bus bar are each provided with a first rounded corner;

preferably, the difference between the outside radius and the inside radius of the first rounded corner is equal to the width of the first bus bar;

preferably, corners of the second bus bars are provided with second rounded corners;

preferably, the difference between the outside radius and the inside 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 1-7, wherein the first and second closed zones are each of convex configuration, the shoulder corners of the convex configuration being rounded.

9. Electrochromic device according to any of claims 1-8, characterized in that an insulating protective layer is provided on the first and/or the second bus bar.

10. An electrochromic device, characterized in that it comprises an electrochromic device according to any one of claims 1 to 9.

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