Battery assembly and preparation method thereof, and display panel

Abstract

The present application provides a battery assembly and a method for preparing the same, and a display panel. The present application provides a conductive suspension structure in the dead zone, and the conductive suspension structure electrically connects the first electrode layer and the second electrode layer in the dead zone to achieve series connection between battery cells; at the same time, compared with the laser process in the prior art, the use of the conductive suspension structure can reduce the area of ​​the dead zone, increase the proportion of the power generation area in the effective zone, and improve the photoelectric conversion efficiency of the battery assembly.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a battery assembly and a preparation method thereof, and a display panel. Background Art

[0002] Perovskite solar cells refer to solar energy technology that uses perovskite-type organic metal halide semiconductors as light-absorbing materials. They have the advantages of high efficiency, low cost, and simple process, while taking into account the characteristics of thin-film batteries such as flexibility. They are expected to integrate the advantages of the first-generation crystalline silicon solar cells and the second-generation inorganic thin-film solar cells, and promote the photovoltaic industry to improve efficiency and reduce costs, opening up long-term market space for the next generation of solar cell technology.

[0003] Perovskite solar cells are usually divided into battery units (cells), and multiple battery units are connected in series to achieve power output. However, since the joints of the battery units in series are dead areas, the dead areas cannot perform photoelectric conversion, resulting in low photoelectric conversion efficiency of perovskite solar cells. Summary of the invention

[0004] The main technical problem solved by the present application is to provide a battery assembly and a preparation method thereof, and a display panel, so as to solve the problem of low photoelectric conversion efficiency of solar cells in the prior art.

[0005] In order to solve the above technical problems, the first technical solution provided by the present application is: to provide a battery assembly, which includes:

[0006] substrate;

[0007] A plurality of battery cells are arranged on one side of the substrate; the battery cells include a first electrode layer, a functional layer, and a second electrode layer which are stacked in sequence;

[0008] The battery cell has a dead area and an effective area; the battery cell also includes a first opening located in the dead area; the first opening penetrates the second electrode layer and the functional layer and partially exposes the first electrode layer;

[0009] Among them, the battery unit also includes a conductive suspension structure located in the dead zone, which is arranged on a side surface of the first electrode layer away from the substrate and is electrically connected to the first electrode layer; the conductive suspension structure penetrates the functional layer and is electrically connected to the second electrode layer.

[0010] The width of the conductive suspension structure is less than 11 microns; the conductive suspension structure includes a conductive portion and an eaves structure which are stacked in sequence; the eaves structure shields the conductive portion and extends the conductive portion in a direction parallel to the substrate; the side wall of the conductive portion is in contact with the second electrode layer; in a direction perpendicular to the substrate, the cross-section of the conductive portion is a trapezoid, and in a direction close to the eaves structure, the width of the conductive portion gradually decreases;

[0011] or,

[0012] The conductive suspension structure comprises a conductive portion, and in a direction perpendicular to the substrate, the cross section of the conductive portion is an inverted trapezoid.

[0013] Wherein, in each battery cell, the cross section of the conductive portion in a direction perpendicular to the substrate is a right-angled trapezoid, and the right-angled side of the right-angled trapezoid is arranged close to the corresponding effective area;

[0014] When the conductive suspension structure includes a conductive part and an eaves structure stacked in sequence, in each battery cell, and in a direction perpendicular to the substrate, an edge of the eaves structure close to the active area is aligned with an edge of the conductive part close to the active area.

[0015] In each battery cell, the first opening is located on a side of the conductive overhang structure close to the effective area and is spaced apart from the conductive portion; the width of the first opening is less than 11 microns.

[0016] Wherein, in each battery unit, and in a direction parallel to the substrate, the first opening is arranged tangentially to the conductive portion and is located on a side of the conductive portion close to the active area.

[0017] Among them, in each battery cell, the second electrode layer includes a first part and a second part that are insulated, the first part is located in the effective area, the second part is located in the dead area, and the second part is electrically connected to the conductive suspension structure; multiple battery cells are connected in series; on the series path of the battery cells, among two adjacent battery cells, the second part of one battery cell is electrically connected to the first part of the other battery cell.

[0018] The battery cell further includes a second opening located in the dead zone, and the second opening penetrates the first electrode layer; in each battery cell, the second opening is located on a side of the conductive overhang structure away from the effective zone; and the width of the second opening is less than 11 microns.

[0019] Wherein, in each battery unit, and in a direction perpendicular to the substrate, an edge of the conductive overhanging structure is aligned with an edge of the second opening close to the first opening.

[0020] In order to solve the above technical problems, the second technical solution provided by the present application is: to provide a method for preparing a battery assembly, which is used to prepare the above battery assembly, wherein the method comprises:

[0021] A first electrode layer and a conductive overhang structure of a battery cell are formed on a substrate; the battery cell has a dead area and an effective area; the conductive overhang structure is located in the dead area and is electrically connected to the first electrode layer;

[0022] A functional layer and a second electrode layer of a battery cell are sequentially formed on the first electrode layer; the second electrode layer is electrically connected to the conductive suspension structure;

[0023] The first opening is prepared by adopting a graphic process; the first opening is located in the dead zone; the first opening penetrates the second electrode layer and the functional layer, and partially exposes the first electrode layer.

[0024] In order to solve the above technical problem, the third technical solution provided in the present application is: to provide a display panel, which includes the above battery assembly.

[0025] Beneficial effects of the present application: Different from the prior art, the present application provides a battery assembly and a method for preparing the same, and a display panel, wherein the battery assembly includes a substrate and a plurality of battery cells. The plurality of battery cells are arranged on one side of the substrate. The battery cell includes a first electrode layer, a functional layer, and a second electrode layer which are stacked in sequence. The battery cell has a dead zone and an effective zone. The battery cell also includes a first opening located in the dead zone. The first opening penetrates the second electrode layer and the functional layer, and partially exposes the first electrode layer. Among them, the battery cell also includes a conductive suspension structure located in the dead zone, and the conductive suspension structure is arranged on a side surface of the first electrode layer away from the substrate, and is electrically connected to the first electrode layer. The conductive suspension structure penetrates the functional layer and is electrically connected to the second electrode layer. The present application arranges a conductive suspension structure in the dead zone, and the conductive suspension structure electrically connects the first electrode layer and the second electrode layer in the dead zone to realize the series connection between the battery cells; at the same time, compared with the laser process in the prior art, the use of a conductive suspension structure can reduce the area of ​​the dead zone, increase the proportion of the power generation area of ​​the effective zone, and improve the photoelectric conversion efficiency of the battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technical workers in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 It is a structural schematic diagram of a battery assembly in the prior art;

[0028] Figure 2 is a structural schematic diagram of a first embodiment of a battery assembly provided by the present application;

[0029] Figure 3 is a structural schematic diagram of a second embodiment of a battery assembly provided by the present application;

[0030] Figure 4 is a structural schematic diagram of a third embodiment of a battery assembly provided by the present application;

[0031] Figure 5 is a structural schematic diagram of a fourth embodiment of a battery assembly provided by the present application;

[0032] Figure 6 It is a schematic diagram of a process of an embodiment of a method for preparing a battery assembly provided in the present application;

[0033] Figure 7 yes Figure 6 A structural schematic diagram of an implementation method corresponding to steps S100 to S300;

[0034] Figure 8 yes Figure 6 A structural diagram of an implementation method corresponding to steps S200 and S300;

[0035] Fig. 9 yes Figure 6 A structural schematic diagram of another implementation method corresponding to steps S200 and S300;

[0036] Fig.10 is a schematic structural diagram of a first embodiment of a display panel provided by the present application;

[0037] Fig.11 is a schematic structural diagram of a second embodiment of a display panel provided by the present application;

[0038] Fig.12 It is a schematic structural diagram of the third embodiment of the display panel provided in the present application.

[0039] Description of Figure Numbers:

[0040] 100, battery assembly; 10, substrate; 20, battery cell; 21, first electrode layer; 22, functional layer; 221, first transmission layer; 222, active layer; 223, second transmission layer; 23, second electrode layer; 231, first part; 232, second part; M1, effective area; M2, dead area; 24, conductive suspension structure; 241, conductive part; 242, eaves structure; H1, first opening; H2, second opening; 200, display panel; 201, frame area; 202, display area. DETAILED DESCRIPTION

[0041] The scheme of the embodiment of the present application is described in detail below in conjunction with the drawings of the specification.

[0042] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technical workers in the field without making creative work are within the scope of protection of this application.

[0044] The terms "first", "second" and "third" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of this application are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0045] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] See also Figure 1 , Figure 1 It is a structural schematic diagram of a battery assembly in the prior art.

[0047] The current perovskite battery assembly 100 is prepared by PVD (Physical Vapor Deposition), evaporation, coating, and Laser.

[0048] The production process of the perovskite battery assembly 100 requires four laser processes, P1-P4, which involve the entire preparation process of the perovskite battery assembly 100 and are an essential part of the entire production process.

[0049] The first three laser scribings (P1-P3) vaporize the material and form grooves, dividing the entire film layer into battery cells 20 with a width of about 4 mm to 12 mm connected in series, thereby forming a separate module that blocks current conduction to achieve the effect of increasing voltage and connecting batteries in series. P4 (not shown) is to clean the edge of the glass film layer to form an insulating area as the rear packaging area.

[0050] Each battery cell 20 contains two areas: Dead area (dead area M2) and Active area (active area M1). The outermost area from P1 line to P3 line cannot generate electricity, commonly known as dead area M2. The larger the width of dead area M2, the greater the proportion of ineffective power generation area in battery cell 20, and the lower the power generation efficiency of battery cell 20. Therefore, the key core technical indicator of laser scribing process is to minimize dead area M2. That is, reduce the line width and the spacing between lines. Due to the influence of laser parameters (precision, minimum line width and heat affected zone), corresponding bottlenecks appear.

[0051] See also Figure 2 , Figure 2 It is a structural schematic diagram of the first embodiment of the battery assembly provided in this application.

[0052] Therefore, in order to solve the problems of the prior art, the present application provides a battery assembly 100. The battery assembly 100 includes a substrate 10 and a plurality of battery cells 20. The plurality of battery cells 20 are arranged on one side of the substrate 10. The battery cell 20 includes a first electrode layer 21, a functional layer 22, and a second electrode layer 23 stacked in sequence. The battery cell 20 has a dead area M2 and an effective area M1. The battery cell 20 also includes a first opening H1 located in the dead area M2. The first opening H1 penetrates the second electrode layer 23 and the functional layer 22, and partially exposes the first electrode layer 21. Among them, the battery cell 20 also includes a conductive overhang structure 24 located in the dead area M2, and the conductive overhang structure 24 is arranged on a side surface of the first electrode layer 21 away from the substrate 10, and is electrically connected to the first electrode layer 21. The conductive overhang structure 24 penetrates the functional layer 22 and is electrically connected to the second electrode layer 23.

[0053] The present application sets a conductive suspension structure 24 in the dead area M2, and the conductive suspension structure 24 electrically connects the first electrode layer 21 and the second electrode layer 23 of the dead area M2 to achieve a series connection between the battery cells 20; at the same time, compared with the laser process in the prior art, the use of the conductive suspension structure 24 can reduce the area of ​​the dead area M2, increase the power generation area ratio of the effective area M1, and improve the photoelectric conversion efficiency of the battery assembly 100.

[0054] The battery assembly 100 in the embodiment of the present application is a perovskite solar cell assembly 100. The battery assembly 100 is applied to a display panel 200 (see Fig.10 ).

[0055] The substrate 10 may be a rigid substrate, such as glass, etc. The substrate 10 may also be a flexible substrate, such as polyimide (PI), etc. The material of the substrate 10 is not limited here and is selected according to actual needs.

[0056] A plurality of battery cells 20 are disposed on the surface of the substrate 10. The arrangement of the plurality of battery cells 20 is not limited here and is selected according to actual needs. The plurality of battery cells 20 can be arranged in sequence to form a circular ring structure, or can be arranged in sequence along a certain direction, or can be arranged in a matrix or other arrangements.

[0057] In this embodiment, a plurality of battery cells 20 are arranged side by side in a row. The direction in which the plurality of battery cells 20 are arranged side by side in sequence is the width direction of the battery cells 20. The battery cells 20 are rectangular parallelepipeds.

[0058] In other embodiments, the battery cell 20 may be a ring structure, a cylindrical structure, or the like. The shape of the battery cell 20 is not limited here and is selected according to actual needs.

[0059] The plurality of battery cells 20 are at least two battery cells 20. The plurality of battery cells 20 are connected in series.

[0060] Each battery cell 20 includes a first electrode layer 21, a functional layer 22, and a second electrode layer 23 stacked in sequence. The first electrode layer 21 is disposed on the surface of the substrate 10. The functional layer 22 includes a first transport layer 221, an active layer 222, and a second transport layer 223 stacked in sequence. The first transport layer 221 is disposed on the surface of the first electrode layer 21 away from the substrate 10. One of the first transport layer 221 and the second transport layer 223 is an electron transport layer, and the other is a hole transport layer.

[0061] In this embodiment, the first transport layer 221 is an electron transport layer, the second transport layer 223 is a hole transport layer, and the active layer 222 is a perovskite active layer. The first electrode layer 21 is a transparent conductive layer. For example, the material of the first electrode layer 21 can be indium tin oxide (Indium Tin Oxide, ITO), gallium zinc oxide (Gallium Zinc Oxide, GZO), indium zinc oxide (Indium Zinc Oxide, IZO), etc. The second electrode layer 23 can be a transparent conductive layer or a non-transparent conductive layer, which is selected according to actual needs.

[0062] In other embodiments, the first electrode layer 21 may be a transparent conductive layer or a non-transparent conductive layer, and the second electrode layer 23 may be a transparent conductive layer.

[0063] Each battery cell 20 includes an active area M1 and a dead area M2. On the series path of multiple battery cells 20, the active area M1 and the dead area M2 are alternately arranged. The light irradiated to the active area M1 can achieve photoelectric conversion and generate electrical energy. The light irradiated to the dead area M2 cannot achieve photoelectric conversion and cannot generate electrical energy.

[0064] In each battery cell 20 , the first opening H1 is located at an edge of the dead area M2 close to the active area M1 , and the conductive overhanging structure 24 is located at a side of the first opening H1 away from the active area M1 .

[0065] The conductive overhang structure 24 is used to connect the battery cells 20 in series. The width of the conductive overhang structure 24 is less than 11 microns. Specifically, the width of the conductive overhang structure 24 can be less than 11 microns, or less than 10 microns, or less than 8 microns.

[0066] In a specific embodiment, the width of the conductive suspension structure 24 may be 10 micrometers.

[0067] The alignment accuracy of the patterning process can be ±1 micron. Compared with the laser process, the patterning process has higher accuracy. In the existing laser process, the width of the scribing on the functional layer 22 is 50 microns ± 5 microns. In addition, the laser has a heat-affected zone of 10 microns. Therefore, the scribing width of the laser process on the functional layer 22 is generally 35 microns to 65 microns. That is, the width of the conductive overhang structure 24 is smaller than the scribing width of the laser process. The conductive overhang structure 24 obtained by the patterning process in the embodiment of the present application can abandon the original laser process for etching the functional layer 22, reduce the area of ​​the dead zone M2, and thus improve the photoelectric conversion efficiency of the battery assembly 100.

[0068] In some embodiments, the conductive overhang structure 24 includes a conductive portion 241 and an eaves structure 242 which are stacked in sequence. The eaves structure 242 shields the conductive portion 241 and extends the conductive portion 241 in a direction parallel to the substrate 10. The sidewall of the conductive portion 241 is in contact with the second electrode layer 23. In a direction perpendicular to the substrate 10, the cross-section of the conductive portion 241 is trapezoidal, and the width of the conductive portion 241 gradually decreases in a direction close to the eaves structure 242.

[0069] The orthographic projection of the eaves structure 242 on the substrate 10 covers the orthographic projection of the conductive portion 241 on the substrate 10, and the projection area of ​​the eaves structure 242 on the substrate 10 is larger than the projection area of ​​the conductive portion 241 on the substrate 10. The portion of the eaves structure 242 extending from the conductive portion 241 is suspended, and during the process of preparing the functional layer 22 (during the evaporation or coating of the functional layer 22), the suspended portion of the eaves structure 242 can cut off the continuity of the entire functional layer 22 to form an independent block, thereby blocking the channel of the lateral current and forming a separate battery unit 20.

[0070] The width of the conductive hanging structure 24 is equal to the width of the eaves structure 242 .

[0071] The structural design of the conductive suspension structure 24 enables the battery cells 20 to be independent packaging structures. The design of the eaves structure 242 can further block the diffusion path of water and oxygen, protect the sealing of the effective area M1, and improve the stability of the battery assembly 100.

[0072] The conductive portion 241 is disposed on a surface of the first electrode layer 21 away from the substrate 10, and is in contact with and electrically connected to the first electrode layer 21. The second electrode layer 23 located in the dead zone M2 overlaps the sidewall of the conductive portion 241 to achieve series connection between the battery cells 20.

[0073] In the direction perpendicular to the substrate 10, the cross section of the conductive portion 241 is trapezoidal, and the width of the conductive portion 241 gradually decreases in the direction close to the eaves structure 242. The design of the conductive portion 241 being narrow at the top and wide at the bottom can increase the contact area between the conductive portion 241 and the first electrode layer 21, improve the stability of the conductive portion 241, and also facilitate the attachment of the second electrode layer 23 to the side wall of the conductive portion 241 to improve the lap stability.

[0074] In this embodiment, in a direction perpendicular to the substrate 10 , the cross section of the conductive portion 241 is an isosceles trapezoid.

[0075] It should be understood that in other embodiments, the cross-section of the conductive portion 241 may be a non-isosceles trapezoid, that is, the lengths of the two non-parallel sides of the trapezoid may be different.

[0076] In some embodiments, in each battery cell 20, the first opening H1 is located on a side of the conductive overhang structure 24 close to the active area M1 and is spaced apart from the conductive portion 241. The width of the first opening H1 is less than 11 micrometers.

[0077] In some embodiments, the width of the first opening H1 may be smaller than the width of the conductive overhanging structure 24. Specifically, the width of the first opening H1 may be smaller than 10 micrometers, or smaller than 9 micrometers, or smaller than 8 micrometers, or smaller than 6 micrometers.

[0078] The first opening H1 penetrates the first electrode layer 21 and the functional layer 22 of the dead area M2 to cut off the continuity of the first electrode layer 21 of the battery unit 20 where the first opening H1 is located in the effective area M1 and the dead area M2, thereby avoiding lateral conduction crosstalk between the electron transport layer and the hole transport layer. The setting of the first opening H1 abandons the laser process of isolating the second electrode layer 23 and adopts a graphic process technology, so that the width of the first opening H1 can be smaller, thereby reducing the area of ​​the dead area M2 and improving the photoelectric conversion efficiency of the battery assembly 100.

[0079] In some embodiments, in each battery cell 20, the second electrode layer 23 includes a first portion 231 and a second portion 232 that are insulated, the first portion 231 is located in the active area M1, the second portion 232 is located in the dead area M2, and the second portion 232 is electrically connected to the conductive suspension structure 24. A plurality of battery cells 20 are connected in series. In the series path of the battery cells 20, of two adjacent battery cells 20, the second portion 232 of one battery cell 20 is electrically connected to the first portion 231 of the other battery cell 20.

[0080] It can be understood that the first opening H1 divides the first electrode layer 21 into the first portion 231 and the second portion 232 .

[0081] In this embodiment, a surface of the conductive portion 241 away from the substrate 10 is 0.4 micrometers to 0.6 micrometers higher than a surface of the first portion 231 away from the substrate 10 , so as to reserve space so that the first electrode layer 21 can overlap well with the side wall of the conductive portion 241 .

[0082] In a specific embodiment, the height of the conductive portion 241 is 1.5 microns, and the total stacking height of the first electrode layer 21, the functional layer 22, and the first portion 231 stacked in sequence is 1 micron. A surface of the conductive portion 241 away from the substrate 10 is 0.5 microns higher than a surface of the first portion 231 away from the substrate 10.

[0083] In some embodiments, the battery cell 20 further includes a second opening H2 located in the dead area M2, and the second opening H2 penetrates the first electrode layer 21. In each battery cell 20, the second opening H2 is located on a side of the conductive overhang structure 24 away from the active area M1. The width of the second opening H2 is less than 11 microns.

[0084] The second opening H2 is used to separate the first electrode layer 21 between the battery cells 20 .

[0085] In each battery cell 20 , an area between an edge of the second opening H2 away from the first opening H1 and an edge of the first opening H1 away from the second opening H2 is a dead area M2 .

[0086] In some embodiments, the width of the second opening H2 may be smaller than the width of the conductive overhanging structure 24. Specifically, the width of the second opening H2 may be smaller than 10 micrometers, or smaller than 9 micrometers, or smaller than 8 micrometers, or smaller than 6 micrometers.

[0087] In the embodiment of the present application, the second opening H2 is manufactured by a patterning process, and the original laser process for separating the first electrode layer 21 is abandoned, so that the area of ​​the dead zone M2 can be further reduced.

[0088] In some embodiments, in each battery cell 20, and in a direction perpendicular to the substrate 10, the edge of the conductive overhang structure 24 is aligned with the edge of the second opening H2 close to the first opening H1, so that the eaves structure 242 and the second opening H2 can share the same photomask, thereby reducing costs. In addition, the area of ​​the dead zone M2 can be further reduced.

[0089] Specifically, in a direction perpendicular to the substrate 10 , an edge of the eave structure 242 is aligned with an edge of the second opening H2 close to the first opening H1 .

[0090] In other embodiments, in a direction parallel to the substrate 10 , the conductive overhanging structure 24 and the first opening H1 may be staggered.

[0091] See also Figure 2 and Figure 3 , Figure 3 It is a structural schematic diagram of the second embodiment of the battery assembly provided in this application.

[0092] The second embodiment of the battery assembly 100 provided in the present application is basically similar in structure to the first embodiment of the battery assembly 100 provided in the present application, except that the structure of the conductive suspension structure 24 is different.

[0093] In some embodiments, the conductive suspension structure 24 includes a conductive portion 241, and the cross section of the conductive portion 241 is an inverted trapezoid in a direction perpendicular to the substrate 10. The cross section of the conductive portion 241 is set to an inverted trapezoid, and the eaves structure 242 is set similarly to cut off the continuity of the entire functional layer 22 to form an independent block, thereby blocking the channel of the lateral current and forming a separate battery unit 20.

[0094] The width of the conductive overhanging structure 24 is the width of the end of the conductive portion 241 away from the substrate 10 .

[0095] In addition to contacting the sidewall of the conductive portion 241 , the second electrode layer 23 is also arranged in contact with a surface of the conductive portion 241 away from the substrate 10 to increase the contact area between the second electrode layer 23 and the conductive portion 241 and ensure the overlap yield of the second electrode layer 23 and the conductive portion 241 .

[0096] Compared with the first embodiment, the present embodiment can also abandon the four laser processes to reduce the area of ​​the dead zone M2 and improve the photoelectric conversion efficiency of the battery assembly 100; at the same time, the inverted trapezoidal setting of the cross-section of the conductive portion 241 can also make the battery units 20 independent of each other in packaging structure, block the diffusion path of water and oxygen, protect the sealing of the effective area M1, and improve the stability of the battery assembly 100.

[0097] See also Figures 2 to 4 , Figure 4It is a structural schematic diagram of the third embodiment of the battery assembly provided in this application.

[0098] The third embodiment of the battery assembly 100 provided in the present application is basically similar in structure to the first embodiment of the battery assembly 100 provided in the present application, except that the structure of the conductive suspension structure 24 is different.

[0099] In some embodiments, in each battery cell 20, the cross section of the conductive portion 241 in the direction perpendicular to the substrate 10 is a right-angled trapezoid, and the right-angled side of the right-angled trapezoid is arranged close to the corresponding active area M1. When the conductive overhang structure 24 includes the conductive portion 241 and the eaves structure 242 stacked in sequence, in each battery cell 20, and in the direction perpendicular to the substrate 10, the edge of the eaves structure 242 close to the active area M1 is aligned with the edge of the conductive portion 241 close to the active area M1.

[0100] That is to say, the continuity of the functional layer 22 is cut off only on one side of the conductive suspension structure 24 .

[0101] In some embodiments, in each battery cell 20, and in a direction parallel to the substrate 10, the first opening H1 is tangent to the conductive portion 241 and is located on a side of the conductive portion 241 close to the active area M1. The first opening H1 is tangent to the conductive portion 241 to reduce the distance between the first opening H1 and the conductive portion 241, and further reduce the area of ​​the dead zone M2.

[0102] The cross section of the conductive portion 241 is designed to be a right-angled trapezoid, and the edge of the eave structure 242 close to the active area M1 is aligned with the edge of the conductive portion 241 close to the active area M1, so as to prepare the first opening H1 at or beside the conductive overhang structure 24.

[0103] Compared with the first embodiment, this embodiment can further reduce the area of ​​the dead zone M2.

[0104] See also Figures 2 to 5 , Figure 5 It is a structural schematic diagram of the fourth embodiment of the battery assembly provided in this application.

[0105] The fourth embodiment of the battery assembly 100 provided in the present application is basically similar in structure to the second embodiment of the battery assembly 100 provided in the present application, except that the structure of the conductive suspension structure 24 is different.

[0106] In some embodiments, in each battery cell 20 , the cross section of the conductive portion 241 in a direction perpendicular to the substrate 10 is a right-angled trapezoid, and the right-angled sides of the right-angled trapezoid are disposed close to the corresponding active area M1 .

[0107] In each battery cell 20, and in a direction parallel to the substrate 10, the first opening H1 is tangent to the conductive portion 241 and is located on a side of the conductive portion 241 close to the active area M1. The first opening H1 is tangent to the conductive portion 241 to reduce the distance between the first opening H1 and the conductive portion 241, and further reduce the area of ​​the dead zone M2.

[0108] Compared with the second embodiment, this embodiment can further reduce the area of ​​the dead zone M2.

[0109] See also Figures 2 to 9 , Figure 6 is a schematic diagram of a process for preparing a battery assembly according to an embodiment of the present application. Figure 7 yes Figure 6 A structural diagram of an implementation method corresponding to steps S100 to S300, Figure 8 yes Figure 6 A structural diagram of an implementation method corresponding to steps S200 and S300, Fig. 9 yes Figure 6 A schematic structural diagram of another implementation method corresponding to steps S200 and S300 in FIG.

[0110] The present application provides a method for preparing a battery assembly, which is used to prepare the above-mentioned battery assembly 100.

[0111] The method for preparing the battery assembly 100 includes:

[0112] S100: forming a first electrode layer and a conductive overhang structure of a battery cell on a substrate; the battery cell has a dead area and an effective area; the conductive overhang structure is located in the dead area and is electrically connected to the first electrode layer.

[0113] Specifically, a first electrode layer 21 is formed on the substrate 10 , and a second opening H2 is formed by a patterning process. A conductive overhang structure 24 is formed on the substrate 10 .

[0114] Exemplarily, the width of the conductive overhang structure is less than 11 microns.

[0115] It should be noted that the conductive suspension structure 24 and the second opening H2 can be prepared at the same time; the conductive suspension structure 24 can be prepared first and the second opening H2 can be prepared later; the second opening H2 can be prepared first and the conductive suspension structure 24 can be prepared later. There are no excessive restrictions here and the selection is made according to actual needs.

[0116] The structure of the conductive suspension structure 24 is not described in detail here, and reference is made to the above description.

[0117] In this embodiment, the battery assembly 100 is described as the structure of the first embodiment described above.

[0118] S200: forming a functional layer and a second electrode layer of a battery unit in sequence on the first electrode layer; the second electrode layer is electrically connected to the conductive suspension structure.

[0119] Specifically, the functional layer 22 and the second electrode layer 23 of the battery cell 20 are sequentially formed on the first electrode layer 21 . The second electrode layer 23 is electrically connected to the conductive overhang structure 24 .

[0120] S300: preparing a first opening by using a graphic process; the first opening is located in the dead zone; the first opening penetrates the second electrode layer and the functional layer, and partially exposes the first electrode layer.

[0121] Specifically, the first opening H1 is prepared by a patterning process. The first opening H1 is located in the dead area M2. The first opening H1 penetrates the second electrode layer 23 and the functional layer 22, and partially exposes the first electrode layer 21.

[0122] In some embodiments, Figure 7 As shown, the first opening H1 is formed by patterning the second electrode layer 23 and the functional layer 22. In each battery cell 20, and in a direction parallel to the substrate 10, the first opening H1 is arranged tangentially to the conductive portion 241, or is arranged at intervals.

[0123] In some embodiments, Figure 8 As shown, when the battery assembly 100 is of the structure of the third embodiment, the first opening H1 can be set to penetrate the conductive overhang structure 24, and the width of the first opening H1 is smaller than the minimum width of the conductive portion 241. That is, the width of the first opening H1 is smaller than the width of the end of the conductive portion 241 away from the substrate 10, so as to avoid excessive etching of the conductive portion 241 during the preparation of the first opening H1, resulting in the second electrode layer 23 being unable to overlap with the conductive portion 241 well, and the conductive portion 241 being unable to support the eaves structure 242, which is not conducive to the stability of the structure.

[0124] In some embodiments, Fig. 9 As shown, when the battery assembly 100 is of the structure of the fourth embodiment, the first opening H1 can be set to penetrate the conductive overhang structure 24, and the width of the first opening H1 is smaller than the minimum width of the conductive portion 241. That is, the width of the first opening H1 is smaller than the width of the end of the conductive portion 241 close to the substrate 10, so as to avoid excessive etching of the conductive portion 241 during the preparation of the first opening H1, resulting in the conductive portion 241 being unable to overlap well with the first electrode layer 21, and the conductive portion 241 being unable to be fixed to the first electrode layer 21, which is not conducive to the stability of the structure.

[0125] The implementation method of the present application abandons the four laser processes and adds a conductive suspension structure 24 to achieve innovation in process technology. Secondly, the introduction of a graphical process compresses the width of the dead zone M2, reduces the area of ​​the dead zone M2, increases the proportion of the effective power generation area, and improves the photoelectric conversion efficiency of the battery assembly 100. In addition, the design of the conductive suspension structure 24 makes the battery cells 20 independent packaging structures, blocks the diffusion path of water and oxygen, protects the airtightness of the effective area M1, and improves the stability of the battery assembly 100.

[0126] See also Figure 2 , Figures 10 to 12 , Fig.10 is a schematic structural diagram of a first embodiment of a display panel provided in the present application, Fig.11 is a schematic structural diagram of a second embodiment of a display panel provided by the present application, Fig.12 It is a schematic structural diagram of the third embodiment of the display panel provided in the present application.

[0127] The present application provides a display panel 200. The display panel 200 includes the battery assembly 100 described above.

[0128] In some embodiments, the battery assembly 100 is located in the border area 201 of the display panel 200 .

[0129] In other embodiments, the battery assembly 100 may be located at other positions of the display panel 200, which is not limited here and is selected according to actual needs.

[0130] The display panel 200 further includes a display area 202 , and the frame area 201 is located at a side of the display area 202 .

[0131] In some embodiments, the battery assembly 100 is a strip structure, and a plurality of battery cells 20 are arranged side by side and arranged in a row (see Fig.10 The battery assembly 100 is located in the frame area 201 and on one side of the display area 202 .

[0132] In some other embodiments, the battery assembly 100 is a ring structure, and a plurality of battery cells 20 are arranged around to form a ring structure (see Fig.11 The battery assembly 100 is located in the frame area 201 and surrounds the display area 202 .

[0133] In some other embodiments, the battery assembly 100 is a ring structure, and a plurality of ring-shaped battery cells 20 are sequentially nested and connected in series to form a ring structure (see Fig.12 ). The inner diameters of the plurality of annular battery cells 20 are different.

[0134] The display panel 200 further includes a circuit (not shown) disposed in the frame area 201. The circuit is disposed below the battery assembly 100 and is insulated from each other.

[0135] Integrating the above-mentioned battery assembly 100 on the display panel 200 can enable the display panel 200 to have the function of solar charging; at the same time, it can not only charge the display panel 200, but also supply surplus electric energy to the energy storage device when the display panel 200 is in standby mode, so that the energy storage device can maintain sufficient power, which can reduce the capacity of the energy storage device, thereby reducing the thickness of the display panel 200.

[0136] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0137] The above are only implementation methods of the present application, and are not intended to limit the patent protection scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery assembly, characterized in that: include: substrate; A plurality of battery cells are arranged on one side of the substrate; the battery cells include a first electrode layer, a functional layer and a second electrode layer which are stacked in sequence; The battery cell has a dead zone and an effective zone; the battery cell further comprises a first opening located in the dead zone; the first opening penetrates the second electrode layer and the functional layer and partially exposes the first electrode layer; The battery unit further comprises a conductive overhanging structure located in the dead zone, the conductive overhanging structure is arranged on a surface of the first electrode layer away from the substrate and is electrically connected to the first electrode layer; the conductive overhanging structure penetrates the functional layer and is electrically connected to the second electrode layer; The conductive suspension structure comprises a conductive portion and an eaves structure which are stacked in sequence; the eaves structure shields the conductive portion and extends the conductive portion in a direction parallel to the substrate; the sidewall of the conductive portion is in contact with the second electrode layer; in a direction perpendicular to the substrate, the cross-section of the conductive portion is a trapezoid, and in a direction close to the eaves structure, the width of the conductive portion gradually decreases; or, The conductive suspension structure includes a conductive portion, and in a direction perpendicular to the substrate, a cross section of the conductive portion is an inverted trapezoid.

2. The battery assembly according to claim 1, characterized in that: The width of the conductive suspension structure is less than 11 microns.

3. The battery assembly according to claim 2, characterized in that: In each of the battery cells, the cross section of the conductive portion in a direction perpendicular to the substrate is a right-angled trapezoid, and the right-angled side of the right-angled trapezoid is arranged close to the corresponding active area; When the conductive suspension structure includes a conductive portion and an eaves structure stacked in sequence, in each of the battery cells, and in a direction perpendicular to the substrate, an edge of the eaves structure close to the active area is aligned with an edge of the conductive portion close to the active area.

4. The battery assembly according to claim 2 or 3, characterized in that: In each of the battery cells, the first opening is located on a side of the conductive overhang structure close to the active area and is spaced apart from the conductive portion; a width of the first opening is less than 11 microns.

5. The battery assembly according to claim 3, characterized in that: In each of the battery cells, and in a direction parallel to the substrate, the first opening is arranged tangentially to the conductive portion, and is located on a side of the conductive portion close to the active area.

6. The battery assembly according to claim 1, characterized in that: In each of the battery cells, the second electrode layer includes a first part and a second part that are insulated, the first part is located in the effective area, the second part is located in the dead area, and the second part is electrically connected to the conductive suspension structure; a plurality of the battery cells are connected in series; on the series path of the battery cells, among two adjacent battery cells, the second part of one of the battery cells is electrically connected to the first part of the other battery cell.

7. The battery assembly according to claim 2, characterized in that: The battery cell also includes a second opening located in the dead zone, and the second opening penetrates the first electrode layer; in each of the battery cells, the second opening is located on a side of the conductive overhang structure away from the effective zone; and the width of the second opening is less than 11 microns.

8. The battery assembly according to claim 7, characterized in that: In each of the battery cells, and in a direction perpendicular to the substrate, an edge of the conductive overhanging structure is aligned with an edge of the second opening close to the first opening.

9. A method for preparing a battery assembly, used for preparing the battery assembly according to any one of claims 1 to 8, characterized in that: include: Forming a first electrode layer and a conductive overhang structure of a battery cell on a substrate; the battery cell has a dead area and an effective area; The conductive suspension structure is located in the dead zone and is electrically connected to the first electrode layer; Sequentially forming a functional layer and a second electrode layer of the battery unit on the first electrode layer; the second electrode layer is electrically connected to the conductive suspension structure; A first opening is prepared by a graphic process; the first opening is located in the dead zone; the first opening penetrates the second electrode layer and the functional layer, and partially exposes the first electrode layer.

10. A display panel, characterized in that: A battery assembly comprising the battery assembly described in any one of claims 1 to 8.

Images