A solar cell capable of reducing a cutting loss

Abstract

This invention discloses a solar cell that reduces cutting losses, relating to the field of solar cells. It includes multiple solar cell silicon wafers, each with multiple sets of pre-cut notches on its top and bottom sides, with two pre-cut notches aligned vertically in each set. Each solar cell silicon wafer also has pre-cut grooves on its front and back sides, with the top and bottom ends of each groove aligned with and connected to the two pre-cut notches in the same set. Each solar cell silicon wafer is divided into multiple equally divided cell units through the multiple sets of pre-cut notches and grooves. The multiple solar cell silicon wafers are arranged horizontally from front to back, with gaps between adjacent solar cell silicon wafers. This invention, through the multiple sets of pre-cut notches and grooves on the multiple solar cell silicon wafers, facilitates the cutting of multiple solar cell silicon wafers into multiple cell units, avoids damage to the solar cell silicon wafers during cutting, and is convenient for users.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of solar cells, and particularly relates to a solar cell capable of reducing cutting loss. BACKGROUND

[0002] The solar cell is a device for converting light energy into electric energy through photoelectric effect or photochemical effect, and can output voltage and current instantly as long as it is illuminated. In physics, it is called solar photovoltaic, and is simply called photovoltaic. Thin-film solar cells working on photoelectric effect are mainstream, and wet solar cells working on photochemical effect are still in the embryonic stage.

[0003] At present, with the continuous development of the photovoltaic industry, reducing power generation cost has become the consistent pursuit of the photovoltaic industry. High-efficiency components can improve conversion efficiency, thereby reducing system land occupation and BOS cost, and are sought after by the market. Half or small piece photovoltaic component technology and shingle component technology are two important directions of current high-efficiency solar component technology. The half or small piece photovoltaic component technology divides the finished cell piece into two pieces or more pieces by using a laser scribing device, thereby reducing the internal resistance loss of the component and improving the power of the component. However, the last process of the finished cell piece in the process of laser scribing and splitting causes a damage layer at the edge of the small piece cell after splitting. The defect state density of the damage layer is high, which leads to an increase in the recombination current of the edge region, a decrease in the open voltage, and further leads to the efficiency loss of the small piece cell. SUMMARY

[0004] In view of the above, in order to overcome the defects of the prior art, the present application provides a solar cell capable of reducing cutting loss, which effectively solves the problem that the last process of the finished cell piece in the process of laser scribing and splitting causes a damage layer at the edge of the small piece cell after splitting. The defect state density of the damage layer is high, which leads to an increase in the recombination current of the edge region, a decrease in the open voltage, and further leads to the efficiency loss of the small piece cell.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a solar cell capable of reducing cutting loss, comprising a plurality of solar cell silicon pieces, each of which is provided with a plurality of pre-cutting grooves on the upper and lower sides, and each group of two pre-cutting grooves is arranged in alignment on the upper and lower sides, each of which is provided with a pre-cutting groove on the front and rear sides, and the upper and lower ends of each pre-cutting groove are aligned and connected with the two pre-cutting grooves of the same group, and each of the solar cell silicon pieces is divided into a plurality of equally divided cell units through a plurality of pre-cutting grooves and a plurality of pre-cutting grooves.

[0006] The plurality of solar cell silicon pieces are arranged in a horizontal direction and arranged in sequence from front to back, and a gap is arranged between the adjacent two solar cell silicon pieces, and the left and right ends of the plurality of solar cell silicon pieces are provided with a retainer.

[0007] Preferably, each of the holders comprises a first rectangular frame and a U-shaped plate, the first rectangular frame is sleeved on the outside of the plurality of solar cell silicon wafers, the U-shaped plate is sleeved on the end of the plurality of solar cell silicon wafers, and the two open ends of the U-shaped plate are fixedly connected with the side walls of the first rectangular frame, a plurality of uniformly distributed insertion rods are fixedly connected on the bottom plate of the U-shaped plate, the end of each insertion rod is square, and each insertion rod corresponds to the position gap and abuts against the surfaces of the two adjacent solar cell silicon wafers.

[0008] Preferably, the end of each of the insertion rods away from the U-shaped plate is trapezoidal.

[0009] Preferably, the inner side walls of the four sides of the first rectangular frame are fixedly provided with first protective pads, and the inner side walls of the four sides of the first protective pads are closely attached to the surfaces of the plurality of solar cell silicon wafers.

[0010] Preferably, the inner side walls of the bottom plate of the U-shaped plate are fixedly provided with second protective pads, and the second protective pads are closely abutted against the ends of the plurality of solar cell silicon wafers.

[0011] Preferably, the middle parts of the plurality of solar cell silicon wafers are jointly sleeved with two second rectangular frames, the inside of each of the second rectangular frames is fixedly provided with a plurality of vertical partitions, and the plurality of partitions pass through the plurality of gaps and are closely abutted against the two adjacent solar cell silicon wafers.

[0012] Preferably, each of the pre-cut grooves is V-shaped, and the depth of each pre-cut groove is 3um, and the end face of each pre-cut groove is also V-shaped, and the depth of each pre-cut groove is 2um.

[0013] The technical effects and advantages of the present application are as follows:

[0014] 1. When the solar cell silicon wafers are cut into a plurality of cell units, the two holders can simultaneously fix and support the plurality of solar cell silicon wafers, and maintain a gap between the two adjacent solar cell silicon wafers, so as to avoid the mutual influence of the two adjacent solar cell silicon wafers during cutting, and the plurality of groups of pre-cut grooves and the plurality of pre-cut grooves on the plurality of solar cell silicon wafers facilitate the cutting of the plurality of solar cell silicon wafers into a plurality of cell units, avoid damage to the solar cell silicon wafers during cutting, and facilitate the use of people. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings are used to provide further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0016] Figure 1 is a front structure schematic diagram of the present application;

[0017] Figure 2 is a side structure schematic diagram of the present application;

[0018] Figure 3 is a top structure schematic diagram of the U-shaped plate of the present application;

[0019] Figure 4 is a side structure schematic diagram of the second rectangular frame of the present application;

[0020] Figure 5 is a three-dimensional structure schematic diagram of the solar cell silicon wafer of the present application;

[0021] Figure 6 is a top structure schematic diagram of the solar cell silicon wafer of the present application.

[0022] In the figure: 1, solar cell silicon wafer; 2, pre-cut; 3, pre-cut groove; 4, first rectangular frame; 5, U-shaped plate; 6, insertion rod; 7, first protective pad; 8, second protective pad; 9, second rectangular frame; 10, partition plate. DETAILED DESCRIPTION

[0023] The present application provides a solar cell capable of reducing cutting loss, as shown in Figures 1-6 The solar cell comprises a plurality of solar cell silicon wafers 1, each of which is provided with a plurality of groups of pre-cuts 2 on the upper and lower sides, and each group of two pre-cuts 2 is arranged in alignment on the upper and lower sides, and each of the solar cell silicon wafers 1 is provided with a pre-cut groove 3 on the front and rear sides, and the upper and lower ends of each pre-cut groove 3 are respectively aligned and connected with the two pre-cuts 2 of the same group, and each of the solar cell silicon wafers 1 is divided into a plurality of equally divided cell units through the plurality of groups of pre-cuts 2 and the plurality of pre-cut grooves 3.

[0024] The plurality of solar cell silicon wafers 1 are arranged in a horizontal manner and arranged in sequence from front to back, and a gap is arranged between the adjacent two solar cell silicon wafers 1, and the left and right ends of the plurality of solar cell silicon wafers 1 are provided with a retainer.

[0025] As shown in Figure 1 , Figure 2 and Figure 3Each holder comprises a first rectangular frame 4 and a U-shaped plate 5, the first rectangular frame 4 is sleeved outside the plurality of solar cell silicon wafers 1, the U-shaped plate 5 is sleeved at the end of the plurality of solar cell silicon wafers 1, and the two open ends of the U-shaped plate 5 are fixedly connected with the side walls of the first rectangular frame 4, a plurality of uniformly distributed insertion rods 6 are fixedly connected on the bottom plate of the U-shaped plate 5, the end of each insertion rod 6 is square, and each insertion rod 6 is located in the gap and abuts against the surfaces of the two adjacent solar cell silicon wafers 1, the bottom plate of the U-shaped plate 5 simultaneously abuts against the end of the plurality of solar cell silicon wafers 1, so that the plurality of solar cell silicon wafers 1 are flush, so that the plurality of groups of pre-cutting grooves 2 on the plurality of solar cell silicon wafers 1 are sequentially aligned, and the plurality of groups of insertion rods 6 can separate the plurality of solar cell silicon wafers 1, so that the plurality of solar cell silicon wafers 1 maintain a gap, thereby avoiding mutual influence of the two adjacent solar cell silicon wafers 1 during cutting.

[0026] As shown in Figure 3 each insertion rod 6 is trapezoidal at one end away from the U-shaped plate 5, so that the plurality of insertion rods 6 are respectively inserted into the plurality of gaps.

[0027] As shown in Figure 2 the four inner side walls of the first rectangular frame 4 are fixedly provided with first protective pads 7, the four inner side walls of the first protective pads 7 are closely attached to the surfaces of the plurality of solar cell silicon wafers 1, so that the first rectangular frame 4 and the plurality of solar cell silicon wafers 1 are protected, and damage to the solar cell silicon wafers 1 is avoided.

[0028] As shown in Figure 3 the inner side wall of the bottom plate of the U-shaped plate 5 is fixedly provided with second protective pads 8, the second protective pads 8 are simultaneously closely abutted against the ends of the plurality of solar cell silicon wafers 1, so that the U-shaped plate 5 and the plurality of solar cell silicon wafers 1 are protected, and damage to the ends of the solar cell silicon wafers 1 is avoided.

[0029] As shown in Figure 1 and Figure 4 the middle portions of the plurality of solar cell silicon wafers 1 are jointly sleeved with two second rectangular frames 9, the interiors of the two second rectangular frames 9 are fixedly provided with a plurality of vertically arranged partitions 10, the plurality of partitions 10 respectively pass through the plurality of gaps and are closely abutted against the two adjacent solar cell silicon wafers 1, so that the plurality of solar cell silicon wafers 1 are supported.

[0030] Meanwhile, each pre-cutting groove 2 is V-shaped, and the depth of each pre-cutting groove 2 is 3um, and the end face of each pre-cutting groove 3 is also V-shaped, and the depth of each pre-cutting groove 3 is 2um.

[0031] The working principle of the present application is that when the solar cell silicon wafer 1 is cut into multiple cell units, the two retaining frames provided can simultaneously fix and support multiple solar cell silicon wafers 1, and keep a gap between the adjacent two solar cell silicon wafers 1, so as to avoid the mutual influence of the adjacent two solar cell silicon wafers 1 during cutting, and through the multiple groups of pre-cutting grooves 2 and multiple pre-cutting grooves 3 on the multiple solar cell silicon wafers 1, the multiple solar cell silicon wafers 1 can be conveniently cut into multiple cell units, avoiding damage to the solar cell silicon wafer 1 during cutting, and facilitating people to use.

[0032] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, alternatives, and variations can be made in the embodiments without departing from the spirit and scope of the present application as defined by the appended claims and their equivalents.

Claims

1. A solar cell capable of reducing cutting losses, characterized in that: The system includes multiple solar cell silicon wafers (1). Each solar cell silicon wafer (1) has multiple sets of pre-cut slits (2) on its upper and lower sides. The two pre-cut slits (2) in each set are aligned vertically. Each solar cell silicon wafer (1) has pre-cut grooves (3) on its front and rear sides. The upper and lower ends of each pre-cut groove (3) are aligned with and connected to the two pre-cut slits (2) in the same set. Each solar cell silicon wafer (1) is divided into multiple equally divided battery units through multiple sets of pre-cut slits (2) and multiple pre-cut grooves (3). The multiple solar cell silicon wafers (1) are arranged horizontally and sequentially from front to back, and there is a gap between two adjacent solar cell silicon wafers (1). The left and right ends of the multiple solar cell silicon wafers (1) are provided with retainers. Each of the retainers includes a first rectangular frame (4) and a U-shaped plate (5). The first rectangular frame (4) is slidably fitted on the outside of a plurality of solar cell silicon wafers (1). The U-shaped plate (5) is fitted on the ends of the plurality of solar cell silicon wafers (1), and the two open ends of the U-shaped plate (5) are fixedly connected to the side wall of the first rectangular frame (4). A plurality of evenly distributed inserts (6) are fixedly connected to the bottom plate of the U-shaped plate (5). The end of each insert (6) is square, and each insert (6) is in the corresponding position gap and abuts against the surfaces of the two adjacent solar cell silicon wafers (1).

2. A solar cell capable of reducing cutting losses according to claim 1, characterized in that: Each of the inserted rods (6) is trapezoidal at the end furthest from the U-shaped plate (5).

3. A solar cell capable of reducing cutting losses according to claim 2, characterized in that: The first rectangular frame (4) has a first protective pad (7) fixedly installed on the inner sidewalls of all four sides. The inner sidewalls of the first protective pad (7) are tightly attached to the surface of multiple solar cell silicon wafers (1).

4. A solar cell capable of reducing cutting losses according to claim 3, characterized in that: The inner sidewall of the bottom plate of the U-shaped plate (5) is fixedly provided with a second protective pad (8), which simultaneously abuts against the ends of multiple solar cell silicon wafers (1).

5. A solar cell capable of reducing cutting losses according to claim 4, characterized in that: Two second rectangular frames (9) are commonly fitted in the middle of the multiple solar cell silicon wafers (1). Each second rectangular frame (9) has multiple vertically arranged partitions (10) fixed inside. The multiple partitions (10) pass through multiple gaps and closely abut against the two adjacent solar cell silicon wafers (1).

6. A solar cell capable of reducing cutting losses according to claim 5, characterized in that: Each of the pre-cut openings (2) is V-shaped and the depth of each pre-cut opening (2) is 3 μm. The end face of each pre-cut groove (3) is also V-shaped and the depth of each pre-cut groove (3) is 2 μm.

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