solar power generation module

Abstract

The present invention provides a solar cell unit, which includes conductive connection strips arranged on both sides of the battery cell and parallel to each other. The front and back surfaces of the battery cell are each connected to one conductive connection strip by a plurality of metal wires. The present invention also provides a method for manufacturing two types of solar power generation modules. The present invention can reduce the silver consumption on the outer surface of the battery cell and the light shielding of the metal wires, and improve the manufacturing speed of the solar power generation module. During the arrangement process of the battery cells, the present invention can realize the simultaneous arrangement of a plurality of battery cells and improve the arrangement speed. The present invention can reduce the arrangement accuracy of the battery cells. The arrangement process does not require high-precision positioning of vision and robots, and the effective arrangement of the battery cells can be realized by simple mechanical positioning. The solution of the present invention is applied to a stacked grid battery having a stacked grid structure. The photo-generated current of the stacked grid battery flows vertically from inside the battery cell through an ultrathin seed layer and directly reaches the metal wire, without a lateral transmission process, with small resistance loss, saving the consumption of precious metal silver and avoiding the light shielding by the silver grid wire.

Description

[Technical Field]

[0001] The present invention provides solar power generation module Regarding. [Background technology]

[0002] In the traditional silicon solar cell industry chain, battery cells are manufactured using silicon sheets. Metal patterns used to collect current on the outer surface of the battery cell are pre-prepared. These current-collecting patterns are called fine grids. Taking into consideration shading and current transmission loss, the height-to-width ratio of the fine grids should be as large as possible. The pattern used to collect current in the series and fine grids of battery cells is called the main grid. To a certain extent, as the number of main grid lines increases, the amount of silver used in the fine grid lines can be reduced, and the width of the fine grid lines can be designed narrower. This reduces the thermal resistance loss of the fine grids, reduces silver consumption in the battery cells, and improves efficiency. Therefore, the number of main grids in battery cells is increasing. At the module end, the more main grids there are and the more welded strips connecting the battery cells, the thinner they must be, which increases the difficulty of module manufacturing and process control. Currently, multi-main grid battery series on the market mainly use circular or triangular wire welded strips to connect the circuit. The external light reflection from the outer surface can be reused, improving module light utilization. The number of main grids in a multi-grid system is generally 9-20. Compared with the number of fine grids in the battery and the width of the battery cells, the number of main grids and the actual shading area of ​​the welding strip are still relatively small, so the impact on the overall light utilization rate of the module is relatively limited. Therefore, there are no strict or specific requirements for the welding strip itself, such as the chamfering of the triangular welding strip or the reflectivity requirements for the outer surface of the welding strip.

[0003] Conventional solar photovoltaic modules have the following defects:

[0004] The current path in the battery cell is complex, with photogenerated current being collected within the battery cell substrate by the fine grid lines, transmitted laterally by the fine grid lines to the main grid lines, and transmitted vertically to the weld strips, which then transmit the current out of the battery cell.

[0005] Silver consumption is too high in battery cell metallization.

[0006] The metal outer surface of the battery cell has a large shading area, which affects the efficiency of the battery and module.

[0007] The battery cell current is collected by the outer surface fine grid metal transmission, and the thermal resistance loss during the transmission process reduces the output power of the battery and module.

[0008] The manufacturing speed of solar power modules is slow, and the battery cells in a module are connected in series with a single welding strip to the front and back of each adjacent battery cell, which makes it difficult to significantly improve the manufacturing speed of modules once it reaches a certain level.

[0009] The light utilization rate of the gaps between the battery cells in conventional modules is low. Summary of the Invention

[0010] To solve the deficiencies of the prior art, the present invention provides a solar cell unit, which includes a battery cell, and a first conductive connecting strip and a second conductive connecting strip respectively installed on both sides of the battery cell, where the first conductive connecting strip and the second conductive connecting strip are parallel to each other.

[0011] The surface of the battery cell is connected to the bottom surface of the first conductive connecting strip by a plurality of parallel first metal wires, each of which is fixedly connected to the bottom surface of the first conductive connecting strip by an electrical connecting material, and each of which is also fixedly connected to the surface of the battery cell by an electrical connecting material, and the end of each first metal wire away from the first conductive connecting strip does not extend outside the battery cell.

[0012] The back surface of the battery cell is connected to the top surface of the second conductive connecting strip by a plurality of parallel second metal wires, each of which is fixedly connected to the top surface of the second conductive connecting strip by an electrical connecting material, each of which is also fixedly connected to the back surface of the battery cell by an electrical connecting material, and the end of each second metal wire away from the second conductive connecting strip does not extend outside the battery cell.

[0013] Preferably, the electrical connection materials on the bottom surface of the first conductive connecting strip and the top surface of the second conductive connecting strip can be melted and solidified again during the module lamination process.

[0014] For specific details of the solar cell unit of the present invention, see Example 1.

[0015] The present invention further provides two methods for manufacturing photovoltaic modules, all of which adopt the above solar cell unit. The specific processes are as follows:

[0016] The advantages and benefits of the present invention are as follows:

[0017] The solar cell unit of the present invention is a single battery cell unit, which can be considered as a single unit by combining metal wires (first metal wire, second metal wire) and conductive connecting strips (first conductive connecting strip, second conductive connecting strip) with battery cells. The entire process from the battery cell unit to the solar cell module is the manufacturing process of the solar cell module, and the metal wires (first metal wire, second metal wire) that concentrate and transmit all current to the battery cells and the conductive connecting strips (first conductive connecting strip, second conductive connecting strip) used to connect the battery cells are connected in advance, so the module process is relatively simple compared to conventional module processes.

[0018] In the solar cell module structure of the present invention, current on the outer surface of the battery cell (the front surface of the battery cell, the back surface of the battery cell) can be directly collected and transmitted by metal wires (first metal wire, second metal wire). The metal wires on the outer surface of the battery can be numerous and densely packed. For example, a 166 mm wide battery cell can have more than 120 metal wires on its outer surface. Conventional module serial welding and packaging techniques cannot achieve this structural module packaging. The biggest difference between the module manufacturing method of the present invention and conventional module manufacturing techniques is that the conventional serial welding process is unnecessary. Conventional serial welding techniques cannot meet the needs of a battery series connection process involving such a large number of metal wires. The present invention first combines metal wires (first metal wire, second metal wire) and conductive connecting strips (first conductive connecting strip, second conductive connecting strip) with the battery cells to form independent solar cell modules, and then connects the solar cell modules head and tail, thereby achieving a battery series connection involving a large number of metal wires while simplifying the connection process. Furthermore, the present invention enables simultaneous placement of multiple battery cells during the battery cell placement process, thereby improving placement speed. Furthermore, the present invention can reduce the precision required for battery cell placement, and the placement process does not require high-precision positioning by vision or robots, but can achieve effective placement of battery cells through simple mechanical positioning.

[0019] The present invention proposes an effective connection method for a large number of ultra-fine metal wires, which is used to realize electrical connections between battery cells. The metal wires (first metal wire, second metal wire) are sandwiched between a pair of conductive connecting strips (first conductive connecting strip, second conductive connecting strip), and then welded at high temperature using a laminator, which simply and effectively realizes connections between the thin metal wires and ensures that current between the battery cells is effectively transmitted to each metal wire.

[0020] For batteries with a transparent conductive oxide (TCO) on the outer surface (e.g., HJT (heterojunction with intrinsic thin layer) batteries), the metal wires (first metal wire, second metal wire) can be electrically connected directly to the TCO using conductive rubber or alloy. For batteries without a TCO on the outer surface, the metal wires (first metal wire, second metal wire) can be electrically connected to the metal grid lines on the outer surface of the battery using conductive rubber or alloy. The above structure is suitable for most solar cells, whether they have metal patterns on the outer surface or do not have metal patterns on the outer surface but use TCO to collect current, such as PERC (passivated emitter and rear cell), TOPCon (tunnel oxide passivated contact), and HJT.

[0021] The photo-generated current of the solar cell unit of the present invention is collected on the outer surface of the battery cell (front and back surfaces of the battery cell) and transmitted to the metal wires (first metal wire, second metal wire), without passing through the fine grid. The metal wires (first metal wire, second metal wire) have much lower electrical resistance than the fine grid, so the thermal resistance loss of the current transmitted through the metal wires (first metal wire, second metal wire) can be significantly reduced, resulting in lower losses and higher output power of the module.

[0022] This invention reduces the amount of silver paste consumed in battery modules. Current on the outer surface of the battery cell (front and back surfaces of the battery cell) is collected and transmitted by metal wires (first and second metal wires). The silver paste simply connects the metal wires to the battery cell. The silver paste is designed to transmit current only in the longitudinal direction, perpendicular to the outer surface of the battery cell. This eliminates lateral transmission and eliminates the need for stacking multiple layers of silver paste. This reduces lateral transmission resistance, allows the silver paste height to be reduced to less than 5 μm, and significantly reduces silver paste consumption. Whether it's a PERC, TOPCon, HJT, or other battery, silver consumption can be significantly reduced, by up to 80% or more.

[0023] Conventional battery fine grids and welding strips have a shading rate of 3% to 5%, resulting in serious shading losses. In the present invention, the cross-sectional shape of the metal wires (first metal wire, second metal wire) on the outer surface of the battery cell is preferentially selected to have a highly reflective triangular structure, so that direct light is reflected by the outer surface of the metal wires and finally reaches the battery cell, where it is absorbed. Therefore, the metal wires do not block the incident light on the outer surface of the battery cell, resulting in a high light-receiving rate of the battery module and naturally high efficiency of the battery module.

[0024] The inter-cell conductive connecting strips (first conductive connecting strip, second conductive connecting strip) of the present invention have a highly reflective sawtooth structure, which causes secondary total reflection of incident light and finally returns it to the battery cell, improving the utilization of light between the battery cells. Currently, there is no simple, effective, and convenient method of utilizing incident light between cells on the market, but the inter-cell conductive connecting strips (first conductive connecting strip, second conductive connecting strip) designed in this invention can achieve simple operation and effective utilization.

[0025] As can be seen from the above, the present invention significantly reduces the silver consumption on the outer surface of the battery cell and the light shielding of the metal wire, and also significantly improves the manufacturing speed of the photovoltaic module.

[0026] The solution of the present invention can be applied to a stacked grid battery having a stacked grid structure, as shown in FIG. 4. The stacked grid structure includes an ultra-thin seed layer in the form of grid lines disposed on the outer surface of the battery cell, and metal lines disposed on the ultra-thin seed layer. The metal lines are parallel to the ultra-thin seed layer on which they are located, and the width of the metal lines is not smaller than the width of the ultra-thin seed layer on which they are located. The thickness of the ultra-thin seed layer is ≦5 μm. Specifically, as shown in FIG. 5, the metal lines are fixedly connected to the ultra-thin seed layer on which they are located by a conductive connecting material. More specifically, the metal lines are fixedly connected to the ultra-thin seed layer on which they are located by methods such as welding, conductive curing adhesive connection, or conductive tape connection.

[0027] The ultra-thin seed layer is primarily used to collect and vertically direct the photo-generated current within the battery cell substrate, and the metal lines are primarily used to output the photo-generated current from the battery cell.

[0028] Specifically, the photo-generated current transmission path in a stacked grid battery is collected from within the battery cell substrate to the grid line ultra-thin seed layer, transmitted vertically from the grid line ultra-thin seed layer to the metal lines, and then transmitted from the battery cell by the metal lines, eliminating the need for lateral current transmission via the grid line ultra-thin seed layer.

[0029] The stacked grid battery has a simple structure and a short current transmission path. The battery cell substrate, ultra-thin seed layer, and metal wires are vertically stacked together. Photo-generated current flows vertically from the inside of the battery cell through the ultra-thin seed layer directly to the metal wires. This eliminates the lateral transmission process and reduces electrical resistance loss. This saves on the consumption of precious metal silver in lateral transmission and also avoids or reduces light obstruction caused by the silver grid lines. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 1 is a plan view of a solar cell unit according to the present invention. [Figure 2] FIG. 2 is a side view of the solar cell unit of the present invention. [Figure 3] FIG. 10 is a schematic diagram showing a stack of photovoltaic power generation modules according to Examples 2 and 3 of the present invention. [Figure 4] FIG. 1 is a schematic diagram of a stacked grid structure. [Figure 5] FIG. 1 is a schematic diagram of a stacked grid structure. DETAILED DESCRIPTION OF THE INVENTION

[0031] Hereinafter, specific embodiments of the present invention will be further described with reference to the accompanying drawings and examples. The following examples are intended to more clearly illustrate the technical solutions of the present invention, and are not intended to limit the protection scope of the present invention.

[0032] The specific technical solutions of the present invention are as follows: Example 1 As shown in Figures 1 and 2, the present invention provides a solar cell unit, which includes a rectangular battery cell and a first conductive connecting strip and a second conductive connecting strip respectively arranged on both sides of the battery cell. The first conductive connecting strip and the second conductive connecting strip are parallel to a pair of sides of the battery cell, and the first conductive connecting strip and the second conductive connecting strip are arranged symmetrically. The distance between the first conductive connecting strip and the battery cell, the second conductive connecting strip and the battery cell is 5 mm or less (preferably 0.5 to 5 mm).

[0033] The surface of the battery cell is connected to the bottom surface of the first conductive connecting strip via a plurality of first metal wires arranged parallel to each other and spaced apart. Each first metal wire is perpendicular to the first conductive connecting strip. The width of each first metal wire is 0.05 to 0.2 mm. The spacing between two adjacent first metal wires is 1 to 3 mm. Each first metal wire is fixedly connected to the bottom surface of the first conductive connecting strip by an electrical connecting material. Each first metal wire is also fixedly connected to the surface of the battery cell by an electrical connecting material. One end of each first metal wire remote from the first conductive connecting strip does not extend outside the battery cell.

[0034] The back surface of the battery cell is connected to the top surface of the second conductive connecting strip via a plurality of second metal wires arranged parallel to each other and spaced apart. Each second metal wire is perpendicular to the second conductive connecting strip. The width of each second metal wire is 0.05 to 0.2 mm. The spacing between two adjacent second metal wires is 1 to 3 mm. Each second metal wire is fixedly connected to the top surface of the second conductive connecting strip by an electrical connecting material. Each second metal wire is also fixedly connected to the back surface of the battery cell by an electrical connecting material. The end of each second metal wire remote from the second conductive connecting strip does not extend outside the battery cell.

[0035] in particular: The electrical connection material can be a conductive rubber (e.g., a colloidal material filled with conductive particles), a conductive paste (e.g., a silver paste), a solder (e.g., a solder or other alloy material), or other conductive adhesive material.

[0036] The cross-sectional shape of the first metal wire and the second metal wire is triangular, circular, semicircular, trapezoidal, rectangular, etc. Preferably, the cross-sectional shape of the first metal wire and the second metal wire is triangular, the chamfering R of the apex angle of the triangle is ≦0.03 mm, all base angles of the triangle are >45°, and the width of the base of the triangle is 0.05 to 0.2 mm.

[0037] The outer surfaces of the first metal wire and the second metal wire may be highly reflective surfaces with a reflectance of 80% or more.

[0038] The cross-sectional shapes of the first conductive connecting strip and the second conductive connecting strip may be triangular, circular, semicircular, trapezoidal, rectangular, sawtooth, etc. Preferably, a reflective structure with a reflectance of ≥ 80% is provided on a bottom surface of the first conductive connecting strip that connects to the plurality of first metal lines. Preferably, a reflective structure with a reflectance of ≥ 80% is provided on a top surface of the second conductive connecting strip that connects to the plurality of second metal lines. The reflective structure may be a triangular sawtooth structure, with an apex angle of 90-140 degrees and a chamfered apex angle of R ≤ 0.05 mm.

[0039] Example 2 Based on Example 1, the differences are as follows: The surface of the battery cell is an insulating surface, and an ultra-thin seed layer for conducting current is provided on the surface of the battery cell, and the first metal wire is fixedly connected to the seed layer by an electrical connection material. Preferably, the thickness of the seed layer is ≦5 μm. The seed layer can be directly used in the metallization electroplating process.

[0040] Example 3 Based on Example 1, the differences are as follows: The battery cell has a stacked grid structure. The stacked grid structure includes an ultra-thin seed layer in the form of grid lines disposed on the outer surface of the battery cell, and metal lines disposed on the ultra-thin seed layer. The metal lines are parallel to the ultra-thin seed layer on which they are located, and the width of the metal lines is not smaller than the width of the ultra-thin seed layer on which they are located. The thickness of the ultra-thin seed layer is ≦5 μm. The metal lines are fixedly connected to the ultra-thin seed layer on which they are located by a conductive connecting material. Specifically, the metal lines are fixedly connected to the ultra-thin seed layer on which they are located by methods such as welding, conductive curing adhesive connection, or conductive tape connection.

[0041] More specifically: The ultra-thin seed layer includes a plurality of first ultra-thin seed layers provided on the surface of the battery cell and corresponding one-to-one to the first metal lines, and a plurality of second ultra-thin seed layers provided on the back surface of the battery cell and corresponding one-to-one to the second metal lines.

[0042] The first metal line is laminated on a corresponding first ultrathin seed layer. The first metal line is parallel to the first ultrathin seed layer on which it is located, and the width of the first metal line is not smaller than the width of the first ultrathin seed layer on which it is located. The thickness of the first ultrathin seed layer is ≦5 μm. The first metal line and the first ultrathin seed layer on which it is located are fixedly connected by a conductive connecting material. Specifically, the first metal line and the first ultrathin seed layer on which it is located are fixedly connected by methods such as welding, conductive curing adhesive connection, or conductive tape connection.

[0043] The second metal line is laminated on a corresponding second ultrathin seed layer. The second metal line is parallel to the second ultrathin seed layer on which it is located, and the width of the second metal line is not smaller than the width of the second ultrathin seed layer on which it is located. The thickness of the second ultrathin seed layer is ≦5 μm. The second metal line and the second ultrathin seed layer on which it is located are fixedly connected by a conductive connecting material. Specifically, the second metal line and the second ultrathin seed layer on which it is located are fixedly connected by methods such as welding, conductive curing adhesive connection, or conductive tape connection.

[0044] Example 4 As shown in FIG. 3, the present invention further provides a method for manufacturing a solar cell module using the solar cell of Example 1, Example 2, or Example 3, in which the electrical connecting material on the bottom surface of the first conductive connecting strip and the top surface of the second conductive connecting strip can be re-melted and hardened during the module lamination process, and the method includes the following steps:

[0045] 1) A photovoltaic panel (such as a photovoltaic glass) and a surface rubber membrane are laid together. The dimensions of the surface rubber membrane and the photovoltaic panel are basically the same, and the surface rubber membrane is laid flat on the photovoltaic panel.

[0046] 2) A robotic arm or mechanical suction cup is used to grip the solar cell units (either one solar cell unit or multiple solar cell units at once), and the solar cell units are laid flat on a rubber surface using a modular circuit connection structure to form a battery string. Within each battery string, the first conductive connecting strip of one solar cell unit is stacked on the second conductive connecting strip of an adjacent solar cell unit. The first metal wire on the bottom of the first conductive connecting strip and the second metal wire on the top of the second conductive connecting strip are sandwiched between the first and second conductive connecting strips, ensuring effective connections between adjacent battery cells in the battery string. Since the electrical connections on the outer surfaces of the battery cells are complete (each first metal wire is fixedly connected to the surface of a battery cell, and each second metal wire is fixedly connected to the back surface of a battery cell), the process only requires achieving electrical connections between the solar cell units. Therefore, the precision requirements for gripping and positioning the battery cells are very low, allowing multiple sheets to be gripped simultaneously, thereby improving the speed of sheet placement. The stacked first and second conductive connecting strips form a conductive connecting strip pair.

[0047] 3) Welding the busbar and electrode lead wires: The busbar is used to connect the battery strings and complete the entire circuit of the module, and the lead wires are welded at the extraction position and connected to the external junction box.

[0048] 4) Lay down the back rubber membrane and the photovoltaic back panel (back panel glass is also acceptable). At this point, a laminated component is formed ready for lamination.

[0049] 5) The laminated components are placed in a laminator to be laminated and pressed together. The lamination temperature is 130-160°C. During the lamination process, the electrical connection material between the conductive connecting strip pairs is melted, and the conductive connecting strip pairs and the first and second metal wires between the conductive connecting strip pairs are fixed together, achieving stable electrical connection between adjacent battery cells.

[0050] 6) Install the junction box and module frame and allow to solidify.

[0051] Example 5 As shown in FIG. 3, the present invention further provides a method for manufacturing a photovoltaic module using the photovoltaic cell of Example 1, Example 2 or Example 3, including the following steps:

[0052] 1) A photovoltaic panel (such as a photovoltaic glass) and a surface rubber membrane are laid together. The dimensions of the surface rubber membrane and the photovoltaic panel are basically the same, and the surface rubber membrane is laid flat on the photovoltaic panel.

[0053] 2) A robotic arm or mechanical suction cup is used to grip the solar cell units (either one solar cell unit or multiple solar cell units at once), and the solar cell units are laid flat on a rubber surface using a modular circuit connection structure to form a battery string. Within each battery string, the first conductive connecting strip of one solar cell unit is stacked on the second conductive connecting strip of an adjacent solar cell unit. The first metal wire on the bottom of the first conductive connecting strip and the second metal wire on the top of the second conductive connecting strip are sandwiched between the first and second conductive connecting strips, ensuring effective connections between adjacent battery cells in the battery string. Since the electrical connections on the outer surfaces of the battery cells are complete (each first metal wire is fixedly connected to the surface of a battery cell, and each second metal wire is fixedly connected to the back surface of a battery cell), the process only requires achieving electrical connections between the solar cell units. Therefore, the precision requirements for gripping and positioning the battery cells are very low, allowing multiple sheets to be gripped simultaneously, thereby improving the speed of sheet placement. The stacked first and second conductive connecting strips form a conductive connecting strip pair.

[0054] 3) Heating the electrical connection material between the pair of conductive connecting strips to melt and solidify the electrical connection material between the pair of conductive connecting strips, thereby firmly connecting the pair of conductive connecting strips and the first and second metal wires between the pair of conductive connecting strips, and achieving stable electrical connection between adjacent battery cells.

[0055] 4) Welding the busbar and electrode lead wires: The busbar is used to connect the battery strings and complete the entire circuit of the module, and the lead wires are welded at the extraction position and connected to the external junction box.

[0056] 5) Lay down the back rubber membrane and the photovoltaic back panel (back panel glass is also acceptable). At this time, a laminated component is formed ready for lamination.

[0057] 6) The laminated parts are placed in a laminator and laminated, and the laminated parts are pressed together to bond them together.

[0058] 7) Install the junction box and module frame and allow to solidify.

[0059] It should be noted that the above is merely a preferred embodiment of the present invention, and that those skilled in the art may make some improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A solar cell module comprising at least two solar cell units connected in series in a head-to-tail direction, Each of the solar cell units is a battery cell; and a first conductive connecting strip and a second conductive connecting strip disposed on both sides of the battery cell in the longitudinal direction, respectively; the first conductive connecting strip and the second conductive connecting strip are parallel to each other; the battery cell has, on its front and back surfaces, seed layer fine grid lines for current collection, extending along the head-to-tail direction, and metal lines arranged on the seed layer fine grid lines, extending along the head-to-tail direction, and having a cross-sectional area larger than that of the seed layer fine grid lines; the seed layer fine grid lines transmit current generated in the battery cells to the metal lines, and the metal lines constitute a main current path for transmitting current transmitted from the seed layer fine grid lines in the head-to-tail direction, thereby achieving functional separation of the current transmission paths; the metal lines include a plurality of first metal lines and a plurality of second metal lines; a surface of the battery cell connected to a bottom surface of the first conductive connecting strip by a plurality of first metal wires parallel to each other; Each of the first metal wires is fixedly connected to the bottom surface of the first conductive connecting strip by an electrical connecting material; each of the first metal lines is also fixedly connected to the seed layer fine grid lines on the surface of the battery cell by the electrical connection material, and one end of each of the first metal lines remote from the first conductive connection strip does not extend outside the battery cell; the back surface of the battery cell is connected to the top surface of the second conductive connecting strip by a plurality of parallel second metal wires; each of the second metal wires is fixedly connected to the top surface of the second conductive connecting strip by an electrical connecting material; Each of the second metal lines is also fixedly connected to the seed layer fine grid line on the back surface of the battery cell by the electrical connection material, and one end of each of the second metal lines remote from the second conductive connection strip does not extend outside the battery cell; a bottom surface of the first conductive connecting strip of one solar cell unit among the at least two adjacently arranged solar cell units is stacked on a top surface of the second conductive connecting strip of the other solar cell unit; A solar cell module characterized in that the first metal wire of the one solar cell unit and the second metal wire of the other solar cell unit are sandwiched and electrically connected between the first conductive connection strip of the one solar cell unit and the second conductive connection strip of the other solar cell unit.

2. A solar cell module according to claim 1, The solar cell unit has a bottom surface of the first conductive connecting strip that is connected to the plurality of first metal lines and a reflective structure with a reflectance of 80% or more, and a top surface of the second conductive connecting strip that is connected to the plurality of second metal lines and a reflective structure with a reflectance of 80% or more, The reflection structure is a triangular sawtooth structure, and the apex angle of the sawtooth is 90 to 140 degrees; A solar cell module, characterized in that the apex chamfer has a radius of curvature of R≦0.05 mm.

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