Electrochromic diaphragm, electrochromic device and terminal product

Abstract

The utility model provides an electrochromic diaphragm, an electrochromic device and a terminal product, and relates to the technical field of electrochromism. The electrochromic membrane comprises a first conductive substrate layer, an electrochromic layer and a second conductive substrate layer which are stacked in sequence. The electrochromic membrane is provided with at least two grooves; the first conductive substrate layer and the second conductive substrate layer are electrically connected with bus bars, the bus bars make contact with the groove bottoms of the grooves, and the sides, back on to the groove bottoms of the grooves, of the bus bars are provided with abutting pieces corresponding to the grooves. The abutting piece is matched with the conductive substrate layers to fixedly abut against the bus bar, so that stripping between the bus bar and the first conductive substrate layer and stripping between the bus bar and the second conductive substrate layer are not prone to occurring, the situation of poor contact of the electrochromic device can be improved, and the problem that in the prior art, in the using process of the electrochromic device, the service life of the electrochromic device is prolonged is solved. The method has the advantages that the service life of the device is prolonged, and the color changing effect of the device is ensured.

Description

Technical Field

[0001] The present application relates to the field of electrochromic technology, and in particular to an electrochromic film, an electrochromic device and a terminal product. Background Art

[0002] An electrochromic device is a device that can change color under the action of voltage. The core of the electrochromic device is the electrochromic material, which changes its light absorption characteristics when voltage is applied or removed, thereby changing color.

[0003] Electrochromic devices usually require bus bars to be set at the conductive layer of the edge part so as to quickly conduct external power to the conductive layer of the electrochromic film through the bus bars. During the use of electrochromic devices in the prior art, local peeling occurs between the bus bars and the conductive layer, resulting in poor contact of the device, which is manifested as the device not changing color or changing color very slowly. Utility Model Content

[0004] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide an electrochromic film and an electrochromic device.

[0005] The first aspect of the present application provides the following technical solution: an electrochromic film, comprising a first conductive substrate layer, an electrochromic layer, and a second conductive substrate layer stacked in sequence;

[0006] The electrochromic film is provided with at least two grooves, the grooves comprising at least one first groove penetrating the first conductive substrate layer and the electrochromic layer and at least one second groove penetrating the second conductive substrate layer and the electrochromic layer;

[0007] The first conductive substrate layer and the second conductive substrate layer are both electrically connected to a bus bar, the bus bar is in contact with the bottom of the groove, and a pressing piece is arranged on a side of the bus bar facing away from the bottom of the groove and corresponding to the groove.

[0008] As a further optional solution for the electrochromic film, the groove extends along the circumference of the electrochromic film, the pressing member is consistent with the extension direction of the bus bar, and the pressing member at least covers the middle part of the contact portion between the bus bar and the bottom of the groove.

[0009] As a further optional solution for the electrochromic film, the groove extends along the circumference of the electrochromic film, and the pressing member covers two end portions of the bus bar in contact with the bottom of the groove, respectively.

[0010] As a further optional solution for the electrochromic film, the groove extends along the circumference of the electrochromic film, and the pressing member extends to cover the entire portion of the bus bar that contacts the bottom of the groove.

[0011] As a further optional solution for the electrochromic film, the pressing member extends along the circumferential direction of the electrochromic film by a length L1, the groove extends along the circumferential direction of the electrochromic film by a length L2, and 1.5 mm ≤ L2 - L1 ≤ 2.5 mm.

[0012] As a further optional solution for the electrochromic film, L2-L1=2 mm.

[0013] As a further optional scheme for the electrochromic film, the width of the pressing member extending from the inside to the outside along the electrochromic film is D1, the width of the bus bar extending from the inside to the outside along the electrochromic film is D2, and the width of the groove extending from the inside to the outside along the electrochromic film is D3, D2≤D1, and D1≤D3.

[0014] As a further optional solution for the electrochromic film, the projection area of ​​the pressing member on the plane where the electrochromic film is located is S1, the contact area between the bus bar and the bottom of the groove is S2, and 0.5≤S1 / S2.

[0015] As a further optional solution for the electrochromic film, the thickness of the pressing member does not exceed the depth of the groove.

[0016] As a further optional solution for the electrochromic film, the electrochromic film further includes a high-temperature adhesive layer, and the high-temperature adhesive layer covers the bus bar and the pressing member.

[0017] As a further optional solution for the electrochromic film, the softening temperature of the pressing member is higher than 80°C.

[0018] As a further optional scheme for the electrochromic film, at least two of the first grooves and the second grooves are provided, and the first grooves and the second grooves are alternately arranged and spaced along the outer circumference of the electrochromic film, and the bus bar includes a first bus bar and a second bus bar, the first bus bar is provided on the side of the first conductive substrate layer away from the second conductive substrate layer, and the first bus bar extends along the circumference of the electrochromic film to contact the second conductive substrate layer corresponding to at least two of the first grooves, and the second bus bar is provided on the side of the second conductive substrate layer away from the first conductive substrate layer, and the second bus bar extends along the circumference of the electrochromic film to contact the first conductive substrate layer corresponding to at least two of the second grooves.

[0019] The second aspect of the present application further provides an electrochromic device, comprising a substrate layer and the above-mentioned electrochromic film, wherein the substrate layer and the electrochromic film are stacked.

[0020] As a further optional solution for the electrochromic device, an adhesive layer is provided between the substrate layer and the electrochromic film, and the material of the pressing member is consistent with that of the adhesive layer.

[0021] The third aspect of the present application also provides a terminal product, including the above-mentioned electrochromic film or the above-mentioned electrochromic device, wherein the terminal product includes any one of a rearview mirror, a curtain wall, a car sunroof, a car side window, a car windshield, an electronic product housing, glasses and a display panel.

[0022] The embodiments of the present application have the following beneficial effects:

[0023] In the above-mentioned electrochromic film, the second groove penetrates the second conductive substrate layer and the conductive layer of the first conductive substrate layer exposed by the electrochromic layer to form a first electrode, and the bottom of the second groove, that is, the first electrode, contacts and electrically connects with the bus bar. At the same time, the first groove penetrates the first conductive substrate layer and the conductive layer of the second conductive substrate layer exposed by the electrochromic layer to form a second electrode, and the bottom of the first groove, that is, the second electrode, contacts and electrically connects with the bus bar. On this basis, the pressing member is arranged corresponding to the groove and presses against the side of the bottom of the groove of the bus bar facing away from the groove. Due to the presence of the pressing member, the pressing member cooperates with the first conductive substrate layer or the second conductive substrate layer to fix the bus bar tightly, so that it is not easy to peel off between the bus bar and the first conductive substrate layer, and between the bus bar and the second conductive substrate layer, thereby improving the poor electrical contact of the electrochromic device, solving the technical problem of local peeling between the bus bar and the conductive layer in the use of the electrochromic device in the prior art, and having the advantages of improving the service life of the device and ensuring the color change effect of the device.

[0024] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, preferred embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1The overall structure schematic diagram of an electrochromic film provided in an embodiment of the present application is shown;

[0027] Figure 2 A schematic diagram of the overall structure of an electrochromic film provided by another embodiment of the present application is shown;

[0028] Figure 3 A top view of an electrochromic film provided in an embodiment of the present application is shown;

[0029] Figure 4 A partial structural schematic diagram of an electrochromic film provided in an embodiment of the present application is shown;

[0030] Figure 5 A schematic diagram showing the size relationship between a groove, a pressing member and a bus bar in an electrochromic film provided in an embodiment of the present application is shown;

[0031] Figure 6 A partial structural schematic diagram of an electrochromic film provided in another embodiment of the present application is shown;

[0032] Figure 7 A partial structural schematic diagram of an electrochromic film provided in another embodiment of the present application is shown;

[0033] Figure 8 A schematic structural diagram of an electrochromic device provided in an embodiment of the present application is shown.

[0034] Description of main component symbols:

[0035] 100-electrochromic film; 101-groove; 101a-first groove; 101b-second groove; 110-first conductive substrate layer; 111-first substrate layer; 112-first conductive layer; 120-electrochromic layer; 121-electrochromic material layer; 122-electrolyte layer; 123-ion storage layer; 130-second conductive substrate layer; 131-second substrate layer; 132-second conductive layer; 140-bus bar; 140a-first bus bar; 140b-second bus bar; 141-end area; 142-middle area; 150-pressing piece; 160-high temperature glue layer; 200-base material layer; 300-adhesive layer. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0037] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0038] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0041] Example

[0042] Please also read Figure 1 and Figure 2 This embodiment provides an electrochromic film 100, which is applied to products such as rearview mirrors, curtain walls, car sunroofs, car side windows, car windshields, housings of electronic products, glasses, windows of vehicles, and display panels. The electrochromic film 100 includes a first conductive substrate layer 110, an electrochromic layer 120, and a second conductive substrate layer 130. The first conductive substrate layer 110, the electrochromic layer 120, and the second conductive substrate layer 130 are sequentially stacked along the thickness direction of the electrochromic film 100 (indicated by the Z direction in the figure).

[0043] In addition, the electrochromic film 100 is provided with at least two grooves 101 , and the grooves 101 include at least one first groove 101 a penetrating the first conductive substrate layer 110 and the electrochromic layer 120 , and at least one second groove 101 b penetrating the second conductive substrate layer 130 and the electrochromic layer 120 .

[0044] Correspondingly, the first conductive substrate layer 110 and the second conductive substrate layer 130 are both electrically connected to the bus bar 140. The bus bar 140 contacts the bottom of the groove 101, and a pressing member 150 is provided on the side of the bus bar 140 facing away from the bottom of the groove 101 corresponding to the groove 101. In other words, the pressing member 150 is accommodated in the groove 101.

[0045] The inventors found that during the use of the electrochromic film 100, especially when repeatedly charged or discharged in a high temperature environment, the busbar 140 of the electrochromic device will be warped and detached. The inventors also found that this is because a groove 101 is set on the edge of the electrochromic device to arrange the busbar 140. When heated or used, the groove 101 provides a space for the busbar 140 to expand. Alternatively, after the electrochromic film 100 is bonded to the glass substrate through PVB adhesive, but the PVB corresponding to the groove is thinner, the PVB adhesive softens in a high temperature environment, which also provides space for the busbar 140 to expand. In the long run, the bonding performance of the busbar 140 and the conductive layer of the conductive substrate decreases, and there is a risk of detachment. To address this, in the embodiment of the present application, a pressing piece 150 is provided at the groove 101 to reduce the space for the bus bar 140 to expand, and the pressing piece 150 cooperates with the first conductive substrate layer 110 or the second conductive substrate layer 130 to fix the bus bar 140, reducing the risk of the bus bar 140 falling off.

[0046] In the above-mentioned electrochromic film 100, the second groove 101b penetrates the second conductive substrate layer 130 and the electrochromic layer 120 to expose a portion of the conductive layer of the first conductive substrate layer 110 to form a first electrode, and the groove bottom of the second groove 101b, that is, the first electrode, contacts and is electrically connected to the bus bar 140. At the same time, the first groove 101a penetrates the first conductive substrate layer 110 and the electrochromic layer 120 to expose a portion of the conductive layer of the second conductive substrate layer 130 to form a second electrode, and the groove bottom of the first groove 101a, that is, the second electrode, contacts and is electrically connected to the bus bar 140. On this basis, the pressing member 150 is arranged corresponding to the groove 101, and presses on the side of the bus bar 140 facing away from the groove bottom of the groove 101.

[0047] Due to the presence of the pressing piece 150, the pressing piece 150 cooperates with the first conductive substrate layer 110 or the second conductive substrate layer 130 to fix the bus bar 140 tightly. In a high temperature environment, the electrochromic device is repeatedly cycled, and the pressing piece limits the expansion of the bus bar in the groove; thereby, it is not easy for the bus bar 140 and the first conductive substrate layer 110, and the bus bar 140 and the second conductive substrate layer 130 to peel off, thereby improving the poor contact of the electrochromic device, and solving the technical problem of local peeling between the bus bar 140 and the conductive layer during the use of the electrochromic device in the prior art, which has the advantages of increasing the service life of the device and ensuring the color change effect of the device.

[0048] It can be understood that in the embodiment of the present application, the bus bar 140 includes a first bus bar 140a and a second bus bar 140b. The first bus bar 140a is arranged on the side of the first conductive substrate layer 110 away from the second conductive substrate layer 130, the first bus bar 140a contacts the bottom of the first groove 101a, and is electrically connected to the second conductive substrate layer 130 through the first groove 101a. The second bus bar 140b is arranged on the side of the second conductive substrate layer 130 away from the first conductive substrate layer 110, the second bus bar 140b contacts the bottom of the second groove 101b, and is electrically connected to the first conductive substrate layer 110 through the second groove 101b. At this time, the height of the pressing member 150 along the Z direction depends on the depth of the groove 101 along the Z direction. Since both ends of the busbar 140 extend to cover the surface of the first conductive substrate layer 110 or the surface of the second conductive substrate layer 130, while the bottom of the groove 101 is filled to a certain depth by the busbar 140, the top of the groove 101 is also raised to a consistent height by the busbar 140, so the total depth of the groove 101 remains unchanged, and when considering the thickness of the pressing member 150, the thickness of the busbar 140 along the Z direction can be ignored. Among them, the depth of the groove 101 along the Z direction is the height difference between adjacent electrodes. On this basis, the height of the pressing member 150 along the Z direction is equal to or slightly less than the height difference. As a result, the pressing member 150 corresponding to the groove 101 fills the groove 101, which plays a role in eliminating the height difference, and further reduces the stress on the electrochromic film 100 during the assembly process.

[0049] The bus bar 140 at the electrode is compacted by the pressing member 150 , so as to have good contact with the first conductive substrate layer 110 or the second conductive substrate layer 130 , thereby improving the yield of the electrochromic film 100 .

[0050] In addition, during the assembly process, since the overall height difference at the electrodes is small, that is, the thickness at the edge of the electrochromic film 100 is relatively uniform, the edge of the electrochromic film 100 is subjected to more uniform force, thereby reducing the deformation of the electrochromic layer 120, so that the polymer structure will not be reorganized, reducing the possibility of color difference in the formed device.

[0051] Specifically, the first conductive substrate layer 110 is composed of a first substrate layer 111 and a first conductive layer 112 , and the second conductive substrate layer 130 is composed of a second substrate layer 131 and a second conductive layer 132 .

[0052] The first substrate layer 111 and the second substrate layer 131 are both made of transparent flexible materials, such as PET (Polyethyleneterephthalate), PC, etc. The first conductive layer 112 and the second conductive layer 132 are both made of transparent conductive oxides, such as ITO (Indium Tin Oxide), IZO, etc.

[0053] In addition, the first conductive layer 112 is plated on a side of the first substrate layer 111 facing the electrochromic layer 120 , and the second conductive layer 132 is plated on a side of the second substrate layer 131 facing the electrochromic layer 120 .

[0054] Specifically, the electrochromic layer 120 is composed of an electrochromic material layer 121 , an electrolyte layer 122 and an ion storage layer 123 , and the electrochromic material layer 121 , the electrolyte layer 122 and the ion storage layer 123 are sequentially stacked along the Z direction.

[0055] Specifically, the bus bar 140 is made of conductive materials such as copper foil and silver wire. When the bus bar 140 is electrically connected to an external power source, the bus bar 140 conducts the current of the external power source to the corresponding first conductive layer 112 or second conductive layer 132, thereby forming an electrical connection between the electrochromic film 100 and the external power source.

[0056] In some embodiments, the electrochromic film 100 is a single electrode structure. That is, the electrochromic film 100 is provided with two grooves 101, including a first groove 101a and a second groove 101b. The first groove 101a is located at the edge of the electrochromic film 100, accounting for 10%-90% of the electrochromic film 100; the second groove 101b is located at the edge of the electrochromic film 100 except the first groove 101a.

[0057] See also Figure 3In other embodiments, the electrochromic film 100 is a multi-electrode structure. That is, at least two first grooves 101a and second grooves 101b are provided. In addition, the first grooves 101a and the second grooves 101b are provided at the edge of the electrochromic film 100, and the first grooves 101a and the second grooves 101b are alternately arranged and spaced along the circumference of the electrochromic film 100.

[0058] In addition, the first bus bar 140a extends along the circumference of the electrochromic film 100 to contact the second conductive substrate layer 130 corresponding to at least two first grooves 101a, and the second bus bar 140b extends along the circumference of the electrochromic film 100 to contact the first conductive substrate layer 110 corresponding to at least two second grooves 101b. The inventors found that because the bus bar spans the top of the groove and there is a height difference at the electrode, during use, the bus bar at the top of the groove will pull the bus bar at the bottom of the groove, accelerating the falling off of the bus bar. In the embodiment of the present application, by providing a pressing member at the top of the bottom of the groove corresponding to the bus bar, the bus bar is pressed to limit the expansion of the bus bar, which can ensure the firm bonding of the bus bar in the multi-electrode structure and improve the yield of the device.

[0059] It can be understood that a spacing region is formed between the first groove 101a and the adjacent second groove 101b, and the spacing region is also located at the edge of the electrochromic film 100. In the spacing region, the first substrate layer 111, the first conductive layer 112, the electrochromic material layer 121, the electrolyte layer 122, the ion storage layer 123, the second conductive layer 132 and the second substrate layer 131 are sequentially stacked along the Z direction.

[0060] On this basis, the first substrate layer 111, the first conductive layer 112, the electrochromic material layer 121, the electrolyte layer 122, the ion storage layer 123, the second conductive layer 132 and the second substrate layer 131 in the spacing region can be dug out (see Figure 2 ), or you can keep it (see Figure 1 ), thereby forming different multi-electrode structures.

[0061] The following description takes a multi-electrode structure as an example.

[0062] See also Figure 4 Specifically, in some embodiments, the groove 101 extends along the circumference of the electrochromic film 100 , and the extension direction of the pressing member 150 is consistent with the extension direction of the bus bar 140 .

[0063] For example, for the square electrochromic film 100, the circumferential direction at any side edge is a straight line direction, which is indicated by the X direction in the figure. Meanwhile, the groove 101, the pressing member 150 and the bus bar 140 all extend along the first direction.

[0064] In addition, the bus bar 140 has two end regions 141 in contact with the groove bottom of the groove 101 and a middle region 142 , and the two end regions 141 are respectively located at two ends of the middle region 142 along the first direction.

[0065] In some embodiments, the pressing member 150 extends to cover the entire portion of the bus bar 140 that contacts the bottom of the groove 101, that is, the pressing member 150 simultaneously presses against the end region 141 and the middle region 142 of the bus bar 140. At this time, the force on the electrode is most uniform, and the end region 141 and the middle region 142 of the bus bar 140 are in full contact and conduction with the first conductive substrate layer 110 or the second conductive substrate layer 130.

[0066] See also Figure 5 Furthermore, the length of the pressing member 150 extending along the circumferential direction of the electrochromic film 100 is L1, and the length of the groove 101 extending along the circumferential direction of the electrochromic film 100 is L2, which satisfies 1.5mm≤L2-L1≤2.5mm.

[0067] Since the pressing piece 150 needs a high precision to be exactly matched with the size of the groove 101 during production, the pressing piece 150 is made slightly smaller so that it can be better accommodated in the groove 101, thereby better pressing the bus bar 140 against the first conductive substrate layer 110 or the second conductive substrate layer 130. In addition, the pressing piece 150 of this length is set so that the pressing piece 150 is just accommodated in the groove 101, and does not protrude from the groove 101 and overlap with the conductive substrate to cause excessive local thickness, thereby avoiding uneven force on the edge of the electrochromic film 100.

[0068] Optionally, L2-L1 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm or any value between 1.5mm and 2.5mm.

[0069] Preferably, L2-L1=2mm. That is, the length of the pressing member 150 extending along the circumference of the electrochromic film 100 is 2mm shorter than the length of the groove 101 extending along the circumference of the electrochromic film 100. 2mm is the tolerance of most automated production equipment, and a length less than 2mm can meet the pressing requirements and the tolerance requirements of the equipment.

[0070] Furthermore, the width of the pressing member 150 extending from the inside to the outside along the electrochromic film 100 is D1, the width of the bus bar 140 extending from the inside to the outside along the electrochromic film 100 is D2, and the width of the groove 101 extending from the inside to the outside along the electrochromic film 100 is D3, satisfying D2≤D1, and D1≤D3.

[0071] Here, extending from the inside to the outside along the electrochromic film 100 means extending from the center to the edge of the electrochromic film 100 in the plane where the electrochromic film 100 is located.

[0072] Since the width of the pressing piece 150 extending from the inside to the outside along the electrochromic film 100 is greater than or equal to the width of the bus bar 140 extending from the inside to the outside along the electrochromic film 100, the pressing piece 150 can effectively play a pressing role. At the same time, the width of the pressing piece 150 extending from the inside to the outside along the electrochromic film 100 is less than or equal to the width of the groove 101 extending from the inside to the outside along the electrochromic film 100, which can reduce the thickness difference, thereby reducing the risk of cracking during the assembly process. In addition, making the width of the pressing piece 150 smaller than the width of the groove 101 can also effectively avoid short circuits caused by the two conductive layers being connected when the pressing piece 150 is a conductor, further improving the yield of the entire device.

[0073] For example, for the square electrochromic film 100 , the direction extending from the inside to the outside at any side edge is also a straight line direction, which is indicated by the Y direction in the figure.

[0074] Alternatively, for the circular electrochromic film 100 , the direction extending from the inside to the outside is the radial direction.

[0075] See also Figure 6 In other embodiments, two pressing members 150 are correspondingly disposed in each groove 101 , respectively covering the two end portions of the bus bar 140 in contact with the groove bottom of the groove 101 , that is, pressing against the two end regions 141 of the bus bar 140 .

[0076] At this time, it is not easy to peel off between the bus bar 140 and the first conductive substrate layer 110, and between the bus bar 140 and the second conductive substrate layer 130, which can improve the poor contact of the electrochromic device. In addition, the electrochromic layer 120 at the first electrode and the second electrode is not easy to be squeezed and deformed, and the polymer structure in the electrochromic layer 120 is not easy to change, which can improve the poor appearance of the electrochromic device and the color difference when changing color.

[0077] See also Figure 7 In some other embodiments, the pressing member 150 at least covers the middle part of the contact portion between the bus bar 140 and the bottom of the groove 101, that is, it is pressed against the middle area 142 of the bus bar 140, which can also improve the poor contact, poor appearance and color difference of the electrochromic device during color change, and the effect is better than pressing against the two end areas 141 of the bus bar 140.

[0078] Furthermore, the projection area of ​​the pressing member 150 on the plane where the electrochromic film 100 is located is S1, and the contact area between the bus bar 140 and the bottom of the groove 101 is S2. Regardless of whether the pressing member 150 presses against both the end region 141 and the middle region 142 of the bus bar 140, or only presses against the end region 141 of the bus bar 140, or only presses against the middle region 142 of the bus bar 140, 0.5≤S1 / S2 is satisfied.

[0079] At this time, the pressing member 150 can effectively press against the bus bar 140, making the force on the electrode more uniform, thereby improving the poor contact, poor appearance and color difference of the electrochromic device during color change.

[0080] Optionally, S1 / S2 can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2 or any value greater than 0.5, as long as the pressing member 150 does not exceed the range of the groove 101 and the pressing member 150 covers the outer walls of the first base layer 111 and the second base layer 131.

[0081] In some embodiments of the present application, the pressing member 150 may be fixed in the groove by bonding, dripping, or the like.

[0082] Please refer again Figure 1 and Figure 2 Furthermore, the electrochromic film 100 further includes a high-temperature adhesive layer 160; the high-temperature adhesive is made of a flexible PI material. The high-temperature adhesive layer 160 is respectively arranged on both sides of the electrochromic film 100 along the Z direction, corresponding to the busbars 140 and the pressing members 150 on both sides of the electrochromic film 100, and the high-temperature adhesive layer 160 covers the corresponding busbars 140 and pressing members 150. On the one hand, the high-temperature adhesive layer 160 can fix the pressing member 150 in the groove 101; on the other hand, the high-temperature adhesive layer 160 can also play a role in fixing the busbar 140, further improving the stability of the device.

[0083] When in use, the high temperature adhesive layer 160 can encapsulate the bus bar 140 and the pressing member 150 to protect the bus bar 140 and the pressing member 150 .

[0084] Furthermore, the softening temperature of the pressing member 150 is higher than 80°C.

[0085] Generally, the electrochromic device is considered to be in the high temperature zone at 80°C. When the temperature exceeds 80°C, the device stops working. Therefore, the softening temperature of the pressing member 150 is set higher than 80°C to ensure that the pressing member 150 does not soften when the device is at 80°C, and thus cannot provide expansion space for the busbar 140, so that the device can be safely used normally in a high temperature environment.

[0086] In addition, the pressing member 150 is made of insulating material to prevent the pressing member 150 from contacting the conductive layer on the opposite side and causing a short circuit.

[0087] In some embodiments, the pressing member 150 is a PET filling layer.

[0088] Specifically, the length of the PET filling layer along the X direction is consistent with the length of the groove 101 along the X direction, with a tolerance of -2mm. The height of the PET filling layer along the Z direction is consistent with the depth of the groove 101, with a tolerance of ±0.05mm. The width of the PET filling layer along the Y direction is consistent with the width of the busbar 140 along the Y direction, with an accuracy of ±1mm. In addition, a backing glue is provided on the PET filling layer. The softening temperature of the material of the PET filling layer is 140°C, and it is a flexible material with a thickness close to the depth of the groove. After being arranged in the groove of the electrochromic device, it can better adapt to the diaphragm to form a flexible diaphragm.

[0089] During the assembly process, the bus bar 140 is first attached to the edge of the electrochromic film 100, and the bus bar 140 is in contact with the bottom of the groove 101, and then the PET filling layer is fixed to the side of the bus bar 140 facing away from the bottom of the groove 101 by adhesive bonding, and then the high-temperature adhesive layer 160 is attached to the bus bar 140 and the PET filling layer.

[0090] The PET filling layer is used as the pressing member 150, which is easy to process and low in price, and effectively solves the problem of poor appearance and poor durability caused by excessive stress when the electrochromic film 100 is assembled.

[0091] In other embodiments, the pressing member 150 is a cured insulating glue layer or an insulating varnish layer.

[0092] Specifically, the liquid is dripped and then solidified to form a solidified layer. In this way, a pressing piece that is more suitable for the groove can be prepared, and the bonding performance of the busbar and the substrate can be further improved. The length of the glue solidified layer or the insulating varnish layer along the X direction is consistent with the length of the groove 101 along the X direction, with a tolerance of -2mm. The height of the glue solidified layer along the Z direction is consistent with the depth of the groove 101, with a tolerance of ±0.05mm. The width of the glue solidified layer along the Y direction is consistent with the width of the busbar 140 along the Y direction, with an accuracy of ±1mm.

[0093] During the assembly process, the bus bar 140 is first attached to the edge of the electrochromic film 100, and the bus bar 140 is in contact with the bottom of the groove 101. Then, glue is printed on the part of the bus bar 140 in contact with the bottom of the groove 101 or varnish is dripped on to fill the groove. After the glue is cured, a glue cured layer is formed.

[0094] The glue or varnish is selected to have high bonding strength, good high / low temperature resistance, good moisture resistance and long-lasting adhesiveness. The glue or varnish solidified layer is used as the pressing member 150, which is suitable for automated operation and can be produced efficiently.

[0095] In other embodiments of the present application, the pressing member 150 may also be made of other economical materials that are resistant to high temperatures and have small deformation. In addition, the pressing member 150 is fixed to the bus bar 140 in a manner other than bonding or printing, and may also be plated.

[0096] In summary, the electrochromic film 100 is provided with a pressing member 150 in the groove 101, and cooperates with the first conductive substrate layer 110 or the second conductive substrate layer 130 to fix the bus bar 140, so as to fill the groove 101 and eliminate the height difference between the first electrode and the second electrode. During the assembly process, the overall height difference between the first electrode and the second electrode is small, the stress is more uniform, and the deformation of the electrochromic layer 120 is small, so the polymer in the electrochromic layer 120 will not undergo structural reorganization, reducing the possibility of color difference in the formed device, and improving the poor appearance of the electrochromic device. At the same time, the bus bars 140 at the first electrode and the second electrode are compacted by the pressing piece 150, and are not easily peeled off from the first conductive substrate layer 110 and the second conductive substrate layer 130, so that they can have good contact with the first conductive substrate layer 110 and the second conductive substrate layer 130, thereby improving the yield of the electrochromic film 100 and improving the poor contact of the electrochromic device. This solves the technical problem of local peeling between the bus bar 140 and the conductive layer during the use of the electrochromic device in the prior art, and has the advantages of increasing the service life of the device and ensuring the color changing effect of the device.

[0097] See also Figure 8 This embodiment further provides an electrochromic device, including a substrate layer 200 and the electrochromic film 100 , and the substrate layer 200 and the electrochromic film 100 are stacked.

[0098] In some embodiments, the substrate layer 200 is disposed on both sides of the electrochromic film 100 along the thickness direction, so as to provide a more comprehensive bearing and protection effect on the electrochromic film 100 .

[0099] Optionally, the substrate layer 200 is a transparent glass or acrylic plate.

[0100] In some embodiments, an adhesive layer 300 is disposed between the substrate layer 200 and the electrochromic film 100 , and the substrate layer 200 is bonded and fixed to the electrochromic film 100 via the adhesive layer 300 .

[0101] Optionally, the adhesive layer 300 is a transparent insulating colloid, which can be made of PVB. While bonding and fixing the substrate layer 200 to the electrochromic film 100, the adhesive layer 300 can also isolate oxygen and water vapor, protect the electrochromic film 100, and extend the service life of the electrochromic film 100.

[0102] Furthermore, the material of the pressing member 150 is consistent with that of the adhesive layer 300 , which is a PVB (Polyvinyl Butyral) filling layer.

[0103] In some embodiments, the length of the PVB filling layer along the X direction is consistent with the length of the groove 101 along the X direction, with a tolerance of -2 mm. The height of the PVB filling layer along the Z direction is consistent with the depth of the groove 101, with a tolerance of ±0.05 mm. The width of the PVB filling layer along the Y direction is consistent with the width of the busbar 140 along the Y direction, with an accuracy of ±1 mm. In addition, a backing adhesive is provided on the PVB filling layer.

[0104] During the assembly process, the bus bar 140 is first attached to the edge of the electrochromic film 100, and the bus bar 140 is in contact with the bottom of the groove 101, and then the PVB filling layer is fixed to the side of the bus bar 140 facing away from the bottom of the groove 101 by adhesive, and then the high-temperature adhesive layer 160 is attached to the bus bar 140 and the PVB filling layer.

[0105] In other embodiments, the adhesive layer 300 may be partially thickened to form a PVB filling layer. In this case, the pressing member 150 and the adhesive layer 300 are integrally formed, which can reduce the assembly process and simplify the operation steps.

[0106] The PVB filling layer is used as the pressing member 150, which is consistent with the material of the adhesive layer, can be easily processed with the adhesive layer, has a moderate price, and has good leveling properties and better consistency after being softened at high temperature.

[0107] Furthermore, the area of ​​the substrate layer 200 is larger than the area of ​​the electrochromic film 100. On this basis, in addition to the PVB being provided as the adhesive layer 300 between the substrate layer 200 and the electrochromic film 100, the periphery of the electrochromic film 100 is also provided with PVB, so that the two substrate layers 200 are directly bonded and fixed, and the electrochromic film 100 is more comprehensively protected.

[0108] This embodiment also provides a terminal product, including the electrochromic film 100 or the electrochromic device, wherein the terminal product includes any one of a rearview mirror, a curtain wall, a car sunroof, a car side window, a car windshield, a housing of an electronic product, glasses, and a display panel of an electronic product.

[0109] Since the terminal product in the embodiment of the present application adopts any of the above-mentioned electrochromic films 100 , it has all the advantages of the above-mentioned electrochromic films 100 .

[0110] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0111] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0112] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. An electrochromic film, characterized in that: It includes a first conductive substrate layer, an electrochromic layer, and a second conductive substrate layer stacked in sequence; The electrochromic film is provided with at least two grooves, the grooves comprising at least one first groove penetrating the first conductive substrate layer and the electrochromic layer and at least one second groove penetrating the second conductive substrate layer and the electrochromic layer; The first conductive substrate layer and the second conductive substrate layer are both electrically connected to a bus bar, the bus bar is in contact with the bottom of the groove, and a pressing piece is arranged on a side of the bus bar facing away from the bottom of the groove and corresponding to the groove.

2. The electrochromic film according to claim 1, characterized in that: The groove extends along the circumference of the electrochromic film, the pressing member and the bus bar extend in the same direction, and the pressing member at least covers the middle of the contact portion between the bus bar and the bottom of the groove.

3. The electrochromic film according to claim 1, characterized in that: The groove extends along the circumferential direction of the electrochromic film, and the pressing member covers two end portions of the bus bar in contact with the groove bottom of the groove respectively.

4. The electrochromic film according to claim 1, characterized in that: The groove extends along the circumference of the electrochromic film, and the pressing member extends to cover the entire portion of the bus bar that contacts the bottom of the groove.

5. The electrochromic film according to claim 1, characterized in that: The pressing member extends along the circumferential direction of the electrochromic film by a length L1, the groove extends along the circumferential direction of the electrochromic film by a length L2, and 1.5 mm≤L2-L1≤2.5 mm.

6. The electrochromic film according to claim 5, characterized in that: L2-L1=2mm.

7. The electrochromic film according to any one of claims 1 to 6, characterized in that: The width of the pressing member extending from the inside to the outside along the electrochromic film is D1, the width of the bus bar extending from the inside to the outside along the electrochromic film is D2, and the width of the groove extending from the inside to the outside along the electrochromic film is D3, D2≤D1, and D1≤D3.

8. The electrochromic film according to any one of claims 1 to 6, characterized in that: The projection area of ​​the pressing member on the plane where the electrochromic film is located is S1, the contact area between the bus bar and the bottom of the groove is S2, and 0.5≤S1 / S2.

9. The electrochromic film according to any one of claims 1 to 6, characterized in that: The thickness of the pressing member does not exceed the depth of the groove.

10. The electrochromic film according to claim 1, characterized in that: The electrochromic film further includes a high-temperature adhesive layer, and the high-temperature adhesive layer covers the bus bar and the pressing member.

11. The electrochromic film according to claim 1, characterized in that: The softening temperature of the pressing member is higher than 80°C.

12. The electrochromic film according to claim 1, characterized in that: There are at least two of the first grooves and the second grooves, and the first grooves and the second grooves are alternately arranged and spaced along the circumference of the electrochromic film. The bus bar includes a first bus bar and a second bus bar. The first bus bar is arranged on the side of the first conductive substrate layer away from the second conductive substrate layer, and the first bus bar extends along the circumference of the electrochromic film to contact the second conductive substrate layer corresponding to at least two of the first grooves. The second bus bar is arranged on the side of the second conductive substrate layer away from the first conductive substrate layer, and the second bus bar extends along the circumference of the electrochromic film to contact the first conductive substrate layer corresponding to at least two of the second grooves.

13. An electrochromic device, characterized in that: The invention comprises a substrate layer and the electrochromic film according to any one of claims 1 to 12, wherein the substrate layer and the electrochromic film are stacked.

14. The electrochromic device according to claim 13, characterized in that: An adhesive layer is provided between the substrate layer and the electrochromic film, and the material of the pressing member is consistent with that of the adhesive layer.

15. A terminal product, characterized in that: It comprises the electrochromic film as described in any one of claims 1 to 12 or the electrochromic device as described in any one of claims 13 to 14, wherein the terminal product comprises any one of a rearview mirror, a curtain wall, a car sunroof, a car side window, a car windshield, a housing of an electronic product, glasses, and a display panel of an electronic product.

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