Conductive composite adhesive film for 0BB back contact solar photovoltaic module and battery module

Abstract

The utility model discloses a conductive composite adhesive film for a 0BB back contact solar photovoltaic assembly and a battery assembly, the conductive composite adhesive film comprises an adhesive film and interconnection strips, the surface of the adhesive film is provided with a plurality of parallel interconnection strips, each interconnection strip is divided into a plurality of sections by a plurality of discontinuous areas, and the discontinuous areas of two adjacent rows of interconnection strips are distributed in a staggered manner. According to the utility model, the assembly lamination process can be completed only by arranging the battery pieces into the array and then directly laminating the composite adhesive film on the battery piece array, so that the production process is greatly simplified.

Description

Technical Field

[0001] The utility model relates to a conductive composite adhesive film for a 0BB back-contact solar photovoltaic component, and also relates to a battery component. Background Art

[0002] A 0BB ​​back-contact solar cell module consists of tempered glass, encapsulant film, a backsheet or back glass, a cell array consisting of cells and solder ribbons, a frame, and three junction boxes. The cell array and its production are the core technologies of photovoltaic modules. In existing technology, the cell array production process first connects the cells and interconnecting bars into strings, using methods such as welding and bonding. Multiple cell strings are then welded together using busbars / solder ribbons to form a series-parallel circuit, forming the cell array. Finally, the cell array, tempered glass, encapsulant film, and backsheet or back glass are stacked together and laminated to form a laminate. The cell strings are first produced, followed by layout and lap welding. The overall process is relatively complex, and the cell strings are handled multiple times during production, which poses the risk of cell cracking and fragmentation. Furthermore, the cell string welding, layout, and lap welding require multiple specialized production equipment. Each of these specialized equipment requires hardware and software switching when product specifications change, resulting in a complex and time-consuming process. Furthermore, the initial investment cost of the equipment is also high.

[0003] Patent application CN 117438488 A discloses a photovoltaic module and its manufacturing method. The conductors and solder ribbons are embedded in an adhesive film through hot pressing. A middle conductor protruding from the back of the film is reserved. During assembly, the film is directly applied to the cells, with the middle conductor positioned between adjacent cells. The front and back conductors are connected via the middle conductor to form a Z-shaped conductor, minimizing damage to the cells during welding. This type of adhesive film and the middle conductor are difficult to manufacture, and the connection process is also challenging to control. Utility Model Content

[0004] Purpose of the utility model: The purpose of the utility model is to provide an easy-to-process conductive composite film for 0BB back-contact solar photovoltaic modules; another purpose of the utility model is to provide a battery module.

[0005] Technical solution: The conductive composite adhesive film for 0BB back-contact solar photovoltaic modules described in the present invention includes an adhesive film and interconnecting strips. A plurality of parallel interconnecting strips are provided on the surface of the adhesive film. Each interconnecting strip is divided into multiple sections by a plurality of first discontinuity zones, and the first discontinuity zones of two adjacent rows of interconnecting strips are staggered.

[0006] Preferably, in order to connect the battery strings in series and / or in parallel, bus bars are further provided at intervals of interconnection bars of a certain length, and the bus bars form a certain angle with the interconnection bars.

[0007] Preferably, in order to simplify the production steps of the conductive adhesive film, the interconnection strip is at least partially cut away to form a first discontinuous area.

[0008] Preferably, corresponding to the interconnection strip, the adhesive film is at least partially cut away to form a first discontinuous area.

[0009] Preferably, the bus bars and interconnection bars are welding strips and / or welding strips with low-temperature solder.

[0010] Preferably, in order to adapt to different types of battery string-parallel connection modes, a second discontinuous area is provided on the bus bar.

[0011] Preferably, the cross-section of the interconnection bar and the bus bar is circular or polygonal.

[0012] Preferably, the surfaces of the interconnecting bars and bus bars are provided with a black coating.

[0013] A battery assembly comprises the aforementioned conductive composite adhesive film for an 0BB back-contact solar photovoltaic assembly, a battery cell, and the battery cell, wherein the interconnecting strip is connected to the battery cell.

[0014] Preferably, both ends of each section of the interconnection bar are connected to two adjacent battery cells respectively, and the gate lines and / or electrodes of the two adjacent battery cells connected at both ends of the interconnection bar have opposite polarities.

[0015] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. The composite conductive adhesive film is easy to produce and process, which simplifies the production process: the interconnecting bars and bus bars are arranged in order on the surface of the film and hot pressed to complete the film production, which is easy to produce and process. It only requires arranging the battery cells into an array first, and then directly stacking the composite adhesive film on the battery cell array in two steps to complete the component stacking process, which greatly simplifies the production process; 2. It reduces the initial investment cost of the equipment; 3. When switching product specifications, there is no need to go through the complicated equipment hardware switching and debugging process, shortening the changeover time; 4. It simplifies the battery component production process, reduces the cost of professional production equipment such as battery string welding machines, typesetting, and stacking machines, and at the same time, avoids the risk of multiple handling of battery strings during component production, which causes hidden cracks and fragments in the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of the conductive composite film according to the first embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the battery cell structure of the battery assembly of the first embodiment of the present utility model;

[0018] Figure 3 This is a side view of the battery assembly structure of the first embodiment of the present utility model;

[0019] Figure 4 This is a schematic structural diagram of a conductive composite adhesive film according to a second embodiment of the present invention; DETAILED DESCRIPTION

[0020] The technical solution of the present utility model will be further described below with reference to the accompanying drawings.

[0021] Example 1: Figure 1 The figure shows a schematic diagram of the conductive composite film structure of the present invention. The film 1 is the base layer of the conductive structure and is made of materials such as EVA, POE, EPE, and PVB. On one surface of the film 1, a plurality of interconnecting strips 2 are provided along the length direction. Each interconnecting strip 2 is provided with a plurality of discontinuous areas 21, and each interconnecting strip 2 is divided into multiple sections by the discontinuous areas. In the width direction of the film 1, the discontinuous areas 21 of two adjacent interconnecting strips 2 are staggered. The interconnecting strips 2 are used to connect battery cells to form battery strings. The interconnecting strips 2 can be low-temperature interconnecting strips coated with low-temperature solder or conventional interconnecting strips. A black coating can be provided on the surface of the interconnecting strip 2, and the black coating at least covers the light-facing surface of the interconnecting strip. The cross-sectional shape of the interconnecting strip 2 can be circular or a polygon such as a rectangle or a triangle.

[0022] On the adhesive film 1 provided with interconnecting strips 2, bus bars 3 are provided at intervals of a certain length between the interconnecting strips. The bus bars 3 are used to connect battery strings to form battery strings of different series-parallel types and adjust the output voltage of the battery assembly. The bus bars 3 are at a certain angle or perpendicular to the interconnecting strips 1 (parallel to the width direction of the adhesive film). The bus bar 3 can be a low-temperature solder strip provided with a low-temperature solder to facilitate the hot pressing connection of the adhesive film and the interconnecting strips and the welding strips / bus bars, or it can be a conventional welding strip. Similarly, a black coating can be provided on the surface of the bus bar, and the black coating at least covers the light-facing side of the bus bar. The welding methods that can be used for the interconnecting strips 2 and the welding strips / bus bars 3 include but are not limited to hot pressing welding and laser welding. The connection method of the interconnecting strips, bus bars 3 and the adhesive film 1 can be hot pressing connection, thermal bonding, etc.

[0023] like Figure 2 In the prior art, the battery cell 4 is mainly composed of a silicon substrate, and doped layers and doped regions formed on the silicon substrate. The doped layers and doped regions extend continuously along the width direction of the silicon substrate in the form of strips and are alternately arranged along the length direction of the silicon substrate. Therefore, the positive and negative poles of the battery cell are alternately distributed along the length direction of the silicon substrate.

[0024] When laminating, Figure 3 , on the back glass 5, place the cells 4 in order, such as Figure 2, the placement order is: from left to right, the two adjacent battery cells 4 are arranged in opposite directions, that is, the first row of the first battery cell 4 in the first row is the positive electrode area 41 or the positive electrode grid line, and the first row of the second battery cell 4 in the first row is the negative electrode area 42 or the negative electrode grid line, and then a conductive composite adhesive film connected with an interconnection bar 2 and a bus bar 3 is laid on the battery cell. In this way, in the length direction of the adhesive film, the two ends of the same interconnection bar 2 are respectively connected to the positive electrode area 41 (positive electrode grid line) and the negative electrode area 42 (negative electrode grid line) of the two adjacent battery cells, so that the battery cell 4 forms a battery string; the bus bar 3 is located at both ends of the length direction of the adhesive film (a bus bar can also be added in the middle of the adhesive film, not shown), which collects the current derived from the interconnection bar 2, and finally, the front packaging material 6 and the front glass 7 are laid on the top of the battery string for lamination. After lamination is completed, the junction box 8 is connected to the bus bar 3 / welding strip to complete the battery component assembly.

[0025] After adopting the conductive composite adhesive film, the production of components will no longer need to adopt the process route of first stringing the battery cells 4, then stacking and welding, and then laying the back layer of adhesive film. Instead, it only needs to arrange the battery cells 4 into an array first, and then directly stack the composite adhesive film on the battery cell array in two steps to complete the component stacking process, which greatly simplifies the production process.

[0026] Example 2: Based on Example 1, this example also features the following variation: Several parallel, continuous interconnecting strips 2 are provided along the length of one surface of the adhesive film 1. Continuous bus bars 3 are provided at either ends of the adhesive film, or at both ends and in the middle. Bus bars 3 are connected to the ends of the interconnecting strips 2. Several cuts are then made in the adhesive film 1, the interconnecting strips 2, and the bus bars 3, creating staggered discontinuities 21 in the interconnecting strips 2. Discontinuities 31 are also provided in the bus bars 3, allowing the battery strings to form various series-parallel configurations. Pre-cutting the interconnecting strips 2 and then placing them in an orderly fashion on the surface of the adhesive film 1 is a cumbersome process and unsuitable for mass production. Pre-forming the interconnecting strips 2 and bus bars 3 on the surface of the adhesive film 1 and then creating cuts to create discontinuities in the interconnecting strips helps improve production efficiency. The cuts can be rectangular, circular, or polygonal in shape. The cuts can be through holes or blind holes.

Claims

1. A conductive composite adhesive film for an 0BB back contact solar photovoltaic module, comprising an adhesive film (1) and an interconnecting strip (2), characterized in that: The surface of the adhesive film (1) is provided with a plurality of parallel interconnecting strips (2), each interconnecting strip (2) is divided into multiple sections by a plurality of first discontinuous areas (21), and the first discontinuous areas (21) of two adjacent rows of interconnecting strips are staggered.

2. The conductive composite adhesive film for OBB back contact solar photovoltaic modules according to claim 1, characterized in that: It also includes bus bars (3) arranged at intervals of a certain length between interconnecting bars, wherein the bus bars form a certain angle with the interconnecting bars.

3. The conductive composite adhesive film for OBB back contact solar photovoltaic modules according to claim 1, characterized in that: Each interconnection strip (2) is at least partially cut away to form a first discontinuous area.

4. The conductive composite adhesive film for an OBB back contact solar photovoltaic module according to claim 3, characterized in that: The adhesive film (1) is at least partially cut away.

5. The conductive composite adhesive film for OBB back contact solar photovoltaic modules according to claim 2, characterized in that: A second discontinuous area (31) is provided on the busbar (3).

6. The conductive composite adhesive film for an OBB back contact solar photovoltaic module according to claim 2, characterized in that: The interconnection bars (2) and bus bars (3) are welding strips and / or welding strips with low-temperature solder.

7. The conductive composite adhesive film for an OBB back contact solar photovoltaic module according to claim 1 or 2, characterized in that: The cross-sections of the interconnection bars (2) and the bus bars (3) are circular or polygonal.

8. The conductive composite adhesive film for an OBB back contact solar photovoltaic module according to claim 1 or 2, characterized in that: The surfaces of the interconnecting bars (2) and the bus bars (3) are provided with a black coating.

9. A battery assembly, characterized in that: It comprises the conductive composite adhesive film for an 0BB back-contact solar photovoltaic module according to any one of claims 1 to 6, and a cell (4), wherein the interconnecting strip (2) is connected to the cell (4).

10. The battery assembly according to claim 9, wherein the two ends of each interconnection bar (2) are respectively connected to two adjacent battery cells (4), and the grid lines and / or electrode polarities of the two adjacent battery cells connected at the two ends of the interconnection bar (2) are opposite.

Images