Carrying disc capable of reducing deposition obstruction of battery piece

Abstract

The utility model discloses a carrying disc capable of reducing deposition obstruction of a battery piece, which comprises a carrying disc body, a processing groove is arranged on the carrying disc body and used for placing the battery piece, the carrying disc further comprises a plurality of carrying pieces, one end of each carrying piece is connected with the groove wall of the processing groove, and the other end of each carrying piece is connected with the groove wall of the processing groove. And the other end of the slide glass extends towards the direction of the battery piece, and the slide glass can support the battery piece. The battery piece is supported through the slide glass, the single slide glass is used as a bearing area of the battery piece, a continuous annular quadrilateral bearing area in the prior art is replaced, the contact area of the back face of the battery piece and the bearing area is reduced, deposition hindrance of the back face of the battery piece is reduced, and the electricity receiving area of the back face of the battery piece is increased; and higher short-circuit current Isc of the battery piece and higher photoelectric conversion efficiency eff of the battery piece can be obtained.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic cell manufacturing, in particular to a carrier plate capable of reducing the obstruction of cell sheet deposition. Background Art

[0002] PVD vacuum deposition is a simple, mature, and widely used process. In the photovoltaic industry, it's used to deposit TCO and metal layers on either one or both sides. Because heterojunction cells are perfectly bifacial, this vacuum deposition process is particularly popular. Unfortunately, due to the original carrier design, the contact surface of the cell placed on the carrier abuts against its contact receiving area, obstructing the deposition of both the TCO and metal layers. While this design, ostensibly designed to create a two-sided conductive design that isolates the cell, actually compromises the cell's power collection efficiency. Therefore, to improve power collection efficiency (i.e., increase the power collection area), the current practice is to continuously reduce the receiving area, from 2.5mm to the current, production-ready 1mm. Regardless of the reduction, the receiving area remains a four-sided area. While this improves power collection efficiency, further expansion of the available area is needed.

[0003] To illustrate with a mathematical formula, take a 210mm*105mm battery as an example: the total shielding area of the existing carrier plate when it is retracted (1mm) is: 1mm*210mm*2+1mm*103mm*2=626mm 2 It accounts for approximately 2.8% of the total cell area. Currently, the metal grid lines occupy only 2% or less of the cell area, while the load-bearing area accounts for a whopping 2.8%. Therefore, how to increase the backside power receiving area by reducing the load-bearing area is a pressing technical challenge. Utility Model Content

[0004] In order to overcome the above shortcomings, the purpose of the present invention is to provide a carrier that reduces the obstacles to the deposition of battery cells, thereby reducing the area of the carrier region and increasing the backside power receiving area.

[0005] To achieve the above objectives, the present invention adopts a technical solution: a carrier that reduces the obstruction of cell deposition, comprising a carrier body, a processing groove provided on the carrier body, the processing groove being used to place the cell, and a plurality of carriers provided, one end of each of the carriers being connected to the groove wall of the processing groove and the other end extending toward the cell, the carriers being capable of supporting the cell. The cell is supported by the carriers, and a single carrier is used as the supporting area for the cell, replacing the continuous annular quadrilateral receiving area in the prior art. This reduces the contact area between the back of the cell and the receiving area, thereby reducing the obstruction of deposition on the back of the cell and increasing the power receiving area on the back of the cell, thereby obtaining a higher cell short-circuit current Isc and a higher cell photoelectric conversion efficiency eff.

[0006] Furthermore, a carrier sheet is provided at the bottom of the processing groove. The carrier sheet is a ring-shaped structure and is arranged along the groove wall of the processing groove. One end of the carrier sheet is connected to the groove wall of the processing groove, and the other end extends toward the square of the battery cell. The carrier sheet is connected to the carrier sheet, and the carrier sheet can support and fix the carrier sheet.

[0007] Furthermore, the carrier sheet and the carrier sheet are detachably connected.

[0008] Furthermore, a first locking hole is provided on the carrier sheet, and a second locking hole is provided on the carrier sheet, and the carrier sheet and the carrier sheet are connected by screws passing through the first locking hole and the second locking hole.

[0009] Furthermore, the first locking hole and / or the second locking hole is elliptical, and the major axis direction of the ellipse can extend toward the direction close to the battery cell.

[0010] Furthermore, the carrier also includes a protruding arm, one end of which is fixedly connected to the carrier and the other end extends toward the battery cell. The protruding arm can fit into the back of the battery cell to support the battery cell.

[0011] Furthermore, the protruding arm has a width of 0.3mm to 5mm and a length of 2mm to 10mm.

[0012] Furthermore, the number of the slides is 4 to 16, preferably 8.

[0013] Furthermore, the slide is rectangular with a side length of 5 mm to 30 mm, or the slide is circular with a diameter ranging from 5 mm to 30 mm.

[0014] Furthermore, the carrier sheet is made of a heat-deformation-resistant material selected from any one of stainless steel, graphite substrate, and aluminum.

[0015] The beneficial effects of the utility model are:

[0016] 1) The battery cell is supported by a carrier, and a single carrier is used as the supporting area of the battery cell, replacing the continuous annular quadrilateral receiving area in the prior art. This reduces the contact area between the back of the battery cell and the receiving area, thereby reducing the deposition barrier on the back of the battery cell and increasing the power receiving area on the back of the battery cell, which can obtain a higher battery cell short-circuit current Isc and a higher battery cell photoelectric conversion efficiency eff.

[0017] 2) The removable connection between the carrier and the substrate facilitates easy replacement of the substrate or increase or decrease of the number of substrates. During use, only the adjustable battery carrier needs to be replaced, without replacing the entire PVD carrier. This ensures maximum production flexibility and minimizes production costs.

[0018] 3) The first locking hole and / or the second locking hole are set to an elliptical shape. On the one hand, the stress can be dispersed when the first locking hole and the second locking hole are locked with screws. On the other hand, the connection position between the carrier and the carrier can be adjusted, and then the distance between the carrier, the protruding arm and the battery cell can be adjusted, and corresponding adjustments can be made according to the size tolerance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] In order to more clearly illustrate the technical solutions in 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 ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A three-dimensional diagram of a conventional carrier plate;

[0022] Figure 2 This is a front view of the connection between the carrier and the carrier according to one embodiment of the present invention;

[0023] Figure 3 A top view of a carrier sheet and a carrier sheet connected in accordance with an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of preparing a first lock hole on a carrier sheet according to an embodiment of the present invention.

[0025] In the figure: 1, carrier plate; 2, processing position; 3, carrier sheet; 31, first locking hole; 4, carrier sheet; 41, second locking hole; 42, protruding arm; 5, battery cell. DETAILED DESCRIPTION

[0026] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] See attached Figure 1 As shown, in the conventional process, the carrier includes a carrier body 1, on which is provided a processing groove 2. The processing groove 2 is a downwardly concave groove for supporting the battery cell 5. The shape of the processing groove 2 is adapted to the shape of the battery cell 5 to be supported, and the area is slightly larger than the battery area. Each processing groove 2 can support one battery cell 5. Each carrier body 1 is provided with multiple processing grooves 2, which can process multiple battery cells 5 simultaneously, thereby increasing the efficiency of the battery cell vacuum deposition process.

[0028] A carrier sheet 3 is provided at the bottom of the processing tank 2. The carrier sheet 3 is perpendicular to the tank wall of the processing tank 2 and extends squarely toward the cell. The carrier sheet 3 is an annular structure and is used to support and secure the cell 5. The area enclosed by the carrier sheet is the processing position. During the cell vacuum deposition process, the vacuum deposition equipment can perform a vacuum deposition process on the back of the cell 5 from the processing position. In traditional processes, the carrier plate abuts the back of the cell 5 through the carrier sheet 3 to support the cell. During the vacuum deposition process, a ring-shaped shielding area is formed on the back of the cell.

[0029] See attached Figures 2-4 As shown, a carrier sheet 4 is placed on the existing carrier tray, and the carrier sheet 4 is connected to the carrier sheet 3, and the carrier sheet 3 supports and fixes the carrier sheet 4. The carrier sheet supports the battery cell, and a single carrier sheet 4 is used as the battery cell supporting area, replacing the carrier sheet 3 with a continuous annular quadrilateral structure as the receiving area in the prior art. This reduces the contact area between the back of the battery cell and the receiving area, thereby reducing the deposition barrier on the back of the battery cell and increasing the power receiving area on the back of the battery cell, which can achieve a higher battery cell short-circuit current Isc and a higher battery cell photoelectric conversion efficiency eff.

[0030] In some embodiments, multiple carrier sheets 4 are provided, equidistantly arranged circumferentially, to provide equidistant support for the back of the cell 5. By providing multiple carrier sheets, the carrier sheets 4 provide a more secure support for the cell 5. Since the cell 5 is rectangular, the carrier sheet 3 is also rectangular. The distances between the carrier sheets 4 are not absolutely equidistant, but rather are distributed as evenly as possible.

[0031] In some embodiments, the number of carriers 4 is 4 to 16, and the carriers 4 are used to support the battery cells 5. The more carriers 4 there are, the better the support for the battery cells 5, but the shielding area is relatively increased. Preferably, 8 carriers 4 are provided, 3 are provided in the length direction of the carrier 3, and 1 is provided in the width direction of the carrier 3. 6 carriers 4 can also be provided, 3 are provided in the length direction of the carrier 3, and 1 is provided in the width direction of the carrier 3. This embodiment does not limit the number of carriers 4.

[0032] In some implementations, the material of the carrier sheet 4 includes, but is not limited to, stainless steel, graphite substrate, aluminum, and other materials that are resistant to thermal deformation. The carrier sheet 4 can be rectangular with a side length of 5 mm to 30 mm, or circular with a diameter ranging from 5 mm to 30 mm.

[0033] In some embodiments, the carrier sheet 3 and the carrier sheet 4 are detachably connected. Specifically, a first locking hole 31 is provided on the carrier sheet 3, and a second locking hole 41 is provided on the carrier sheet 4. Screws are passed through the first and second locking holes 31, 41 to connect the carrier sheet 3 and the carrier sheet 4. This detachable connection between the carrier sheet 3 and the carrier sheet 4 facilitates replacement of the carrier sheet 4 or increasing or decreasing the number of carrier sheets 4. During use, only the battery carrier sheet 4 needs to be replaced, without replacing the entire PVD carrier plate 1. This maintains maximum production flexibility and minimizes production costs.

[0034] In some embodiments, see Appendix Figure 2 and 4 As shown, the first locking hole 31 is elliptical, with the long axis of the ellipse extending in the direction close to the battery cell 5. The elliptical shape of the first locking hole 31 can, on the one hand, disperse stress when the first locking hole 31 is locked with a screw, and on the other hand, adjust the connection position between the carrier 4 and the carrier 3, and thus adjust the distance between the carrier 4, the protruding arm 42 and the battery cell 5, so that corresponding adjustments can be made according to the dimensional tolerances of the battery cell 5.

[0035] In some embodiments, see Appendix Figure 2 and 3 As shown, the second locking hole 41 is elliptical, with the long axis of the ellipse extending in the direction close to the battery cell 5. The elliptical shape of the second locking hole 41 can, on the one hand, disperse stress when the second locking hole 41 is locked with a screw, and on the other hand, adjust the connection position between the carrier 3 and the carrier 4, and further adjust the distance between the carrier 4, the protruding arm 42, and the battery cell 5, thereby increasing the range of adjustment corresponding to the dimensional tolerance of the battery cell 5.

[0036] In some embodiments, the carrier 4 further includes a protruding arm 42 , one end of which is fixedly connected to the carrier 4 and the other end extends toward the cell 5 . The protruding arm 42 is used to contact the back of the cell 5 to provide support. The width of the protruding arm 42 ranges from 0.3mm to 5mm, and the length ranges from 2mm to 10mm. For example, if a 210mm*105mm cell needs to be processed, the processing position dimensions are 211mm*106mm, with a depth of 5mm. The opening edge has a PVD carrier wall of 35mm.

[0037] Take a 210mm*105mm battery as an example: after fully paved, the area is 210*105=22050mm 2 The total shielding area of the existing carrier plate retracted (1mm) is: 1mm*210mm*2+1mm*103mm*2=626mm 2 , accounting for about 2.8% of the total cell area.

[0038] In this application, the length of the protruding arm 42 is 2 mm and the width is 0.5 mm. For example, the shielding area is: 8*2*0.5=8 mm 2 , accounting for about 0.04% of the total area of the cell. Therefore, the present application can reduce the shading area of the cell by setting the carrier, thereby reducing deposition obstacles.

[0039] In order to study the effect of reducing the obstruction area on the photovoltaic conversion efficiency and short-circuit current of the battery cell, we vacuum deposited the battery cell using a traditional carrier (std) and a carrier (improved) disclosed in this application. To improve the accuracy of the data, 13 groups of batteries were prepared in parallel and the average value was taken. The specific data is shown in Table 1.

[0040] Table 1

[0041] Std-eff(%) Improvement-eff(%) Std-Isc Std-Isc 1 25.41 26.17 8.59 8.71 2 25.48 26.37 8.48 8.67 3 26.18 26.47 8.71 8.74 4 26.11 26.21 8.66 8.73 5 25.98 26.38 8.61 8.71 6 25.89 25.95 8.59 8.75 7 25.77 26.41 8.64 8.65 8 25.98 26.34 8.64 8.66 9 26.14 26.33 8.66 8.73 10 26.07 26.17 8.63 8.74 11 25.69 26.18 8.59 8.72 12 26.14 25.97 8.69 8.75 average value 25.90 26.24 8.62 8.71

[0042] It can be seen from the data in Table 1 that the present application can obtain a higher short-circuit current Isc and a higher photoelectric conversion efficiency eff of the cell by increasing the power receiving area of the cell.

[0043] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0044] The above implementation methods are only for illustrating the technical concept and features of the utility model. Its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the scope of protection of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the scope of protection of the utility model.

Claims

1. A carrier for reducing the obstruction of battery cell deposition, comprising a carrier body (1), wherein the carrier body (1) is provided with a processing groove (2), and the processing groove (2) is used to place the battery cell (5), characterized in that: It also includes a carrier (4), wherein a plurality of carriers (4) are provided, one end of each of the carriers (4) is connected to the groove wall of the processing groove (2), and the other end extends in the direction of the battery cell (5), and the carrier (4) can support the battery cell (5).

2. The carrier for reducing the obstruction of cell deposition according to claim 1, characterized in that: A carrier sheet (3) is provided at the bottom of the processing groove (2). The carrier sheet (3) is an annular structure and is provided along the groove wall of the processing groove (2). One end of the carrier sheet (3) is connected to the groove wall of the processing groove (2), and the other end extends squarely toward the battery cell (5). The carrier sheet (4) is connected to the carrier sheet (3), and the carrier sheet (3) can support and fix the carrier sheet (4).

3. The carrier for reducing the obstruction of cell deposition according to claim 2, characterized in that: The carrier sheet (3) and the carrier sheet (4) are detachably connected.

4. The carrier for reducing the obstruction of cell deposition according to claim 3, characterized in that: The carrier sheet (3) is provided with a first locking hole (31), and the carrier sheet (4) is provided with a second locking hole (41). The carrier sheet (3) and the carrier sheet (4) are detachably connected by screws passing through the first locking hole (31) and the second locking hole (41).

5. The carrier for reducing the obstruction of cell deposition according to claim 4, characterized in that: The first locking hole (31) and / or the second locking hole (41) are elliptical, and the major axis direction of the ellipse can extend in a direction close to the battery cell (5).

6. The carrier for reducing the obstruction of cell deposition according to claim 1, characterized in that: The carrier (4) includes a protruding arm (42), one end of the protruding arm (42) is fixedly connected to the carrier (4), and the other end extends in the direction of the battery cell (5). The protruding arm (42) can be attached to the back of the battery cell (5) to support the battery cell (5).

7. The carrier for reducing the obstruction of cell deposition according to claim 6, characterized in that: The protruding arm (42) has a width of 0.3 mm to 5 mm and a length of 2 mm to 10 mm.

8. The carrier for reducing the obstruction of cell deposition according to claim 1, characterized in that: The number of the slides (4) is 4 to 16.

9. The carrier for reducing the obstruction of cell deposition according to claim 1, characterized in that: The carrier sheet (4) is rectangular with a side length of 5 mm to 30 mm, or the carrier sheet (4) is circular with a diameter range of 5 mm to 30 mm.

10. The carrier for reducing the obstruction of cell deposition according to any one of claims 1 to 9, characterized in that: The carrier sheet (4) is made of a heat-deformation-resistant material, selected from any one of stainless steel, graphite substrate, and aluminum.

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