High-efficiency thin film battery assembly structure

Abstract

The utility model discloses a high-efficiency thin-film battery assembly structure, and the structure comprises front glass which is provided with a light-in surface and a light-out surface which are opposite to each other; the packaging adhesive film is stacked on the light emitting surface; the composite electrode layer is arranged on the light emitting surface and is composed of a transparent conducting layer and a plurality of metal grid lines arranged on the transparent conducting layer at intervals; the first transmission layer is stacked on the transparent conductive layer; the thin film battery layer is stacked on the first transmission layer and is formed by connecting a plurality of sub-batteries in series; the second transmission layer is stacked on the thin film battery layer; the back electrode layer is stacked on the second transmission layer; the current collection grid line is used for connecting the sub-cells in series, one end of the current collection grid line is connected with the composite electrode layer on one sub-cell, and the other end of the current collection grid line is connected with the back electrode layer on the other adjacent sub-cell; the plurality of first insulating layers are arranged along the thickness direction of the thin film battery layer, and the first insulating layers are arranged between the sub-batteries and the current collection grid lines; and the back glass is laminated on the back electrode layer.

Description

Technical Field

[0001] The utility model relates to the technical field of thin film battery assembly design, and in particular to a high-efficiency thin film battery assembly structure. Background Art

[0002] Conventional perovskite thin-film solar cell modules are primarily composed of five components: a transparent conductive substrate, a first transmission layer, a perovskite light-absorbing layer, a second transmission layer, and a metal / transparent electrode. The transparent conductive substrate, typically made of indium tin oxide (ITO) or fluorine-doped tin oxide (FTO), acts as a carrier for other materials, allowing light to enter and transmit the collected photoelectrons to an external circuit.

[0003] The high transmittance and low resistivity of the transparent conductive layer help improve the utilization and conversion efficiency of incident light. However, the optical and electrical properties of the transparent conductive layer are interdependent, and it is generally impossible to achieve both high transmittance and high electrical performance simultaneously. This leads to low photoelectric conversion efficiency in thin-film solar modules. In practical applications, it is necessary to find a balance between optical and electrical performance, which has a certain impact on the photoelectric conversion efficiency of the solar module. Utility Model Content

[0004] The purpose of this utility model is to address the problem that the transparent conductive layer in the current solar thin-film battery module cannot have both high transmittance and high electrical performance, resulting in low photoelectric conversion efficiency of the thin-film battery module. The utility model designs an efficient thin-film battery module structure to solve the above problem, thereby improving the photoelectric conversion efficiency of the thin-film battery module.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0006] The utility model designs a high-efficiency thin-film battery assembly structure, which includes:

[0007] A front glass having a light incident surface and a light exiting surface opposite to each other;

[0008] An encapsulating film is laminated on the light emitting surface;

[0009] A composite electrode layer, which is stacked on the packaging film, and is composed of a transparent conductive layer and a plurality of metal grid lines spaced apart on the transparent conductive layer, wherein the metal grid lines are used to increase light reflection;

[0010] a first transmission layer, which is stacked on the transparent conductive layer;

[0011] A thin film battery layer, which is stacked on the first transmission layer and is composed of a plurality of sub-batteries connected in series;

[0012] a second transmission layer stacked on the thin film battery layer;

[0013] a back electrode layer, stacked on the second transmission layer;

[0014] A plurality of current collecting grid lines, which are used to connect the plurality of sub-cells in series to form the thin film battery layer, wherein one end of the current collecting grid line is connected to the composite electrode layer on one of the sub-cells, and the other end is connected to the back electrode layer on another adjacent sub-cell;

[0015] a plurality of first insulating layers, which are arranged along the thickness direction of the thin film battery layer, and the first insulating layers are correspondingly arranged between the sub-batteries and the current collecting grid lines;

[0016] and a back glass stacked on the back electrode layer.

[0017] Furthermore, a high-efficiency thin-film battery assembly structure is provided: the diameter of the metal grid line is set to 40 to 80 μm.

[0018] Furthermore, a high-efficiency thin-film battery assembly structure is provided: the metal grid lines are configured to have a triangular cross-section.

[0019] Furthermore, a high-efficiency thin-film battery assembly structure is provided: a metal grid line with a triangular structure is disposed on a transparent conductive layer to form an angle α with the transparent conductive layer, and the angle α satisfies 45°≤α≤65°.

[0020] Furthermore, a high-efficiency thin-film battery assembly structure: the material of the metal grid line is selected from Ag, Cu or Al.

[0021] Furthermore, a high-efficiency thin-film battery assembly structure: the thickness of the transparent conductive layer is set to 50-100 nm.

[0022] Furthermore, a high-efficiency thin-film battery assembly structure: the thin-film battery assembly structure also includes a plurality of second insulating layers, the second insulating layers and the first insulating layers are respectively arranged on both sides of the current collecting grid line, and the second insulating layer is arranged between the sub-battery and the current collecting grid line.

[0023] Beneficial effects of the utility model:

[0024] (1) The high-efficiency thin-film battery assembly structure designed in the present invention has both good light transmittance and high conductivity. By using a metal grid line and a transparent conductive layer in combination, a composite electrode layer is formed. This composite electrode layer can utilize the metal grid line to achieve a good conductivity effect when the thickness of the transparent conductive layer is relatively low. At the same time, due to the low thickness of the transparent conductive layer, a high light transmittance can also be guaranteed, so that the prepared thin-film battery assembly structure has a high photoelectric conversion efficiency.

[0025] (2) The thin-film battery module structure designed in the present invention can improve the conductivity while ensuring high light transmittance through the design of a composite electrode layer and the coordinated use of metal grid lines with triangular cross-sections, current collection grid lines and a transparent conductive layer, thereby improving the photoelectric conversion efficiency of the perovskite thin-film battery module.

[0026] (3) The utility model utilizes the multiple reflections of the metal grid lines with triangular cross-sections to increase the utilization rate of light, reduce the reflection of incident light at the metal grid line interface, and improve the battery efficiency and short-circuit current density; at the same time, the composite electrode layer formed by the metal grid lines and the transparent conductive layer has high conductivity, which increases the hole or electron extraction rate of the non-metallic counter electrode and reduces the recombination of electrons and holes, thereby improving the photoelectric conversion efficiency of the thin-film battery assembly.

[0027] (4) The composite electrode designed in this utility model can achieve high light transmittance due to the reduced thickness of the transparent conductive layer, thereby improving battery efficiency and short-circuit current density. Compared with a single transparent electrode layer, the transparent electrode layer combined with the metal grid line in this utility model has lower string resistance, thinner transparent electrode layer, and higher light transmittance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A top view of a high-efficiency thin-film battery assembly structure designed for Example 1 of the present utility model;

[0030] Figure 2 for Figure 1 Cross-section view in the AA direction;

[0031] Figure 3 for Figure 1 Cross-section view along the middle BB direction.

[0032] Markings in the figure: 1-front glass, 2-encapsulation film, 3-composite electrode layer, 4-first transmission layer, 5-thin-film battery layer, 6-second transmission layer, 7-back electrode layer, 8-current collection grid line, 9-first insulating layer, 10-back glass, 11-light incident surface, 12-light output surface, 13-second insulating layer, 31-transparent conductive layer, 32-metal grid line, 51-sub-battery. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicating directions or positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0035] Example 1

[0036] like Figures 1 to 3 As shown, this embodiment 1 designs a high-efficiency thin-film battery assembly structure, which includes:

[0037] A front glass 1 having a light incident surface 11 and a light emitting surface 12 opposite to each other;

[0038] The packaging film 2 is laminated on the light emitting surface 12;

[0039] A composite electrode layer 3 is laminated on the encapsulating film 2. The composite electrode layer 3 is composed of a transparent conductive layer 31 having a thickness of 80 nm and a plurality of metal grid lines 32 spaced apart on the transparent conductive layer 31 (the metal grid lines 32 are in direct contact with the encapsulating film 2). The metal grid lines 32 are made of Ag and have an equilateral triangular cross-section to increase the number of light reflections. An angle α is formed between the triangular metal grid lines 32 and the transparent conductive layer 31, and α is ≤ 60°.

[0040] A first transmission layer 4, which is stacked on the transparent conductive layer 31;

[0041] A thin film battery layer 5 is stacked on the first transmission layer 4 and is composed of a plurality of sub-batteries 51 connected in series;

[0042] A second transmission layer 6, which is stacked on the thin film battery layer 5;

[0043] a back electrode layer 7, which is stacked on the second transmission layer 6;

[0044] A plurality of current collecting grid lines 8, which are used to connect the plurality of sub-cells 51 in series to form the thin film battery layer 5, wherein one end of the current collecting grid line 8 is connected to the composite electrode layer 3 on one of the sub-cells 51, and the other end is connected to the back electrode layer 7 on another adjacent sub-cell 51;

[0045] A plurality of first insulating layers 9 are provided along the thickness direction of the thin film battery layer 5, and the first insulating layers 9 are correspondingly provided between the sub-batteries 51 and the current collecting grid lines 8, and the first insulating layers 9 can provide insulation and passivation;

[0046] and a back glass 10, which is stacked on the back electrode layer 7;

[0047] The thin-film battery assembly structure also includes several second insulating layers 13, which are respectively arranged on both sides of the current collecting grid line 8 with the first insulating layer 9, and the second insulating layer 13 is arranged between the sub-battery 51 and the current collecting grid line 8. The second insulating layer 13 can passivate and protect the sub-battery 51, while preventing the movement of I ions and the formation of metal iodide.

[0048] The high-efficiency thin-film battery module structure designed in this embodiment 1 can achieve both good light transmittance and high conductivity. The metal grid lines 32 with a triangular cross-section and the transparent conductive layer 31 are used in combination to form a composite electrode layer 3. This composite electrode layer 3 can utilize the metal grid lines 32 to achieve the effect of improving conductivity when the thickness of the transparent conductive layer 31 is set to be low. At the same time, since the thickness of the transparent conductive layer 31 is set to be low, the overall light transmittance can also be guaranteed to be high. When sunlight is irradiated, the metal grid lines 32 with a triangular cross-section in the middle are used for multiple reflections to increase the utilization rate of light, reduce the reflection of incident light at the interface of the metal grid lines 32, improve the battery efficiency and short-circuit current density, and thus make the prepared thin-film battery module structure have a high photoelectric conversion efficiency.

[0049] The above preferred embodiments of the present invention are only used to explain the present invention and are not intended to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A high-efficiency thin-film battery assembly structure, characterized in that: The thin film battery assembly structure includes: A front glass (1) having a light incident surface (11) and a light emitting surface (12) opposite to each other; A packaging film (2) is laminated on the light-emitting surface (12); A composite electrode layer (3) is stacked on the packaging film (2), the composite electrode layer (3) being composed of a transparent conductive layer (31) and a plurality of metal grid lines (32) spaced apart on the transparent conductive layer (31), the metal grid lines (32) being used to increase light reflection; a first transmission layer (4) stacked on the transparent conductive layer (31); A thin film battery layer (5) is stacked on the first transmission layer (4) and is composed of a plurality of sub-batteries (51) connected in series; a second transmission layer (6) stacked on the thin film battery layer (5); a back electrode layer (7) stacked on the second transmission layer (6); a plurality of current collecting grid lines (8) for connecting the plurality of sub-cells (51) in series to form the thin film battery layer (5), one end of the current collecting grid line (8) being connected to the composite electrode layer (3) on one of the sub-cells (51), and the other end being connected to the back electrode layer (7) on another adjacent sub-cell (51); a plurality of first insulating layers (9) arranged along the thickness direction of the thin film battery layer (5), and the first insulating layers (9) are correspondingly arranged between the sub-batteries (51) and the current collecting grid lines (8); and a back glass (10) stacked on the back electrode layer (7).

2. The high-efficiency thin-film battery assembly structure according to claim 1, characterized in that: The diameter of the metal grid line (32) is set to 40-80 μm.

3. A high-efficiency thin-film battery assembly structure according to claim 1 or 2, characterized in that: The metal grid line (32) is configured to have a triangular cross-section.

4. The high-efficiency thin-film battery assembly structure according to claim 3, characterized in that: The metal grid line (32) of the triangular structure is arranged on the transparent conductive layer (31) to form an angle α with the transparent conductive layer (31), and satisfies 45°≤α≤65°。 5. The high-efficiency thin-film battery assembly structure according to claim 1, characterized in that: The material of the metal grid line (32) is Ag, Cu or Al.

6. The high-efficiency thin-film battery assembly structure according to claim 1, characterized in that: The thickness of the transparent conductive layer (31) is set to 50-100 nm.

7. The high-efficiency thin-film battery assembly structure according to claim 1, characterized in that: The thin-film battery assembly structure further comprises a plurality of second insulating layers (13), which and the first insulating layer (9) are respectively arranged on both sides of the current collecting grid line (8), and the second insulating layer (13) is arranged between the sub-battery (51) and the current collecting grid line (8).

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