Heterojunction main-grid-free battery assembly

Abstract

The utility model belongs to the technical field of photovoltaic cell assemblies, and provides a heterojunction main-grid-free cell assembly, which comprises a protective frame, and a sealing mechanism is assembled at the top of the protective frame; the battery mechanism is mounted in the protective frame; the battery mechanism comprises a crystalline silicon substrate located in the protective frame, and intrinsic amorphous silicon layers are installed on the front face and the back face of the crystalline silicon substrate. A P-type amorphous silicon layer is assembled on the intrinsic amorphous silicon layer on the front face of the crystalline silicon substrate, and an N-type amorphous silicon layer is installed on the intrinsic amorphous silicon layer on the back face of the crystalline silicon substrate. The light receiving area of the cell mechanism is increased through a main-grid-free electrode mechanism, meanwhile, the thin grid lines are of a variable cross-section structure, the cross section of the part, close to the edge of a cell piece, of the thin grid lines is gradually increased, resistance loss in the current transmission process is reduced, the current collection efficiency is improved, and the photoelectric conversion efficiency is improved by combining the efficient photoelectric conversion performance of a heterojunction structure. And the power generation efficiency of the device is obviously improved.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic cell module technology, specifically a heterojunction gridless cell module. Background Technology

[0002] High-efficiency photovoltaic modules can generate more electricity within a limited area, thereby reducing the unit cost of power generation and improving the economic benefits and competitiveness of photovoltaic power generation.

[0003] However, most traditional photovoltaic cell modules adopt a design with main grid lines. The main grid lines are relatively thick on the surface of the cell. Although their main function is to collect current, they inevitably block some light, reducing the effective light-receiving area of ​​the cell and thus reducing the photoelectric conversion efficiency. Utility Model Content

[0004] To address the aforementioned technical problems, this invention provides a heterojunction gridless battery module, which solves the problem in the prior art where the grid lines on the surface of the battery cell block some light, reducing the effective light-receiving area of ​​the battery.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A heterojunction gridless solar cell module includes a cell structure and a gridless electrode structure located on the front side of the cell structure.

[0007] The main gridless electrode mechanism includes a busbar and fine grid lines, wherein the busbar is an enclosed annular structure, the fine grid lines are located inside the busbar, and the edges of the ends of each fine grid line are connected by the busbar;

[0008] The fine grid lines are variable cross-section wires.

[0009] Preferably, the width of the cross-section of the fine grid line near the edge of the battery structure is greater than the width of the main cross-section.

[0010] Preferably, the cross-section of the fine grid line is triangular, triangular-like, trapezoidal, or trapezoidal.

[0011] Preferably, the fine grid lines intersect to form a mesh structure.

[0012] Preferably, the heterojunction gridless battery module further includes a protective frame, the top of which is fitted with a light-transmitting sealing mechanism, and the battery assembly is installed inside the protective frame.

[0013] Preferably, the sealing mechanism includes a front cover plate mounted on the top of the protective frame, the front of the front cover plate having a light-transmitting layer mounted on its front side, and a number of bolts distributed on the front of the front cover plate surrounding the light-transmitting layer.

[0014] Preferably, the battery structure includes a crystalline silicon substrate, wherein an intrinsic amorphous silicon layer is mounted on the front and back sides of the crystalline silicon substrate;

[0015] A P-type amorphous silicon layer is mounted on the intrinsic amorphous silicon layer on the front side of the crystalline silicon substrate, and an N-type amorphous silicon layer is mounted on the intrinsic amorphous silicon layer on the back side of the crystalline silicon substrate.

[0016] Preferably, the inner wall of the protective frame is surrounded by an insulating isolation strip.

[0017] Preferably, a junction box is fitted on one side of the protective frame, and a connecting wire is installed at the end of the junction box.

[0018] Preferably, a mounting base is installed at the bottom of the protective frame, and the mounting base has a mounting hole at its bottom.

[0019] The beneficial effects of using this utility model are:

[0020] This invention increases the light-receiving area of ​​the battery structure by using a gridless electrode mechanism. At the same time, the fine grid lines adopt a variable cross-section structure, with the cross-section of the fine grid lines gradually increasing near the edge of the battery cell to reduce resistance loss during current transmission and improve current collection efficiency. Combined with the high-efficiency photoelectric conversion performance of the heterojunction structure, the power generation efficiency of the device is significantly improved. Attached Figure Description

[0021] Figure 1 This is an unfolded view of the present invention;

[0022] Figure 2 This is a perspective view of the present utility model;

[0023] Figure 3 This is a bottom view of the unfolded form of this utility model;

[0024] Figure 4 This is an unfolded view of the battery mechanism and the gridless electrode mechanism of this utility model.

[0025] In the picture:

[0026] 1. Protective frame; 2. Battery mechanism; 201. Crystalline silicon substrate; 202. Intrinsic amorphous silicon layer; 203. P-type amorphous silicon layer; 204. N-type amorphous silicon layer; 3. Gridless electrode mechanism; 301. Fine grid lines; 302. Busbar; 4. Sealing mechanism; 401. Front cover plate; 402. Bolt; 403. Light-transmitting layer; 5. Insulating isolation strip; 6. Junction box; 7. Connecting wire; 8. Mounting base. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this technical solution clearer, the following detailed description, in conjunction with specific embodiments, further illustrates this technical solution. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this technical solution.

[0028] As attached Figure 1 Appendix Figure 2 Appendix Figure 3 and attached Figure 4 As shown:

[0029] Example 1: This utility model provides a heterojunction gridless solar cell module, comprising:

[0030] The protective frame 1 is equipped with a sealing mechanism 4 on its top.

[0031] Battery mechanism 2 is installed inside the protective frame 1;

[0032] The battery structure 2 includes a crystalline silicon substrate 201 located inside the protective frame 1, and intrinsic amorphous silicon layers 202 are mounted on the front and back sides of the crystalline silicon substrate 201.

[0033] A P-type amorphous silicon layer 203 is mounted on the intrinsic amorphous silicon layer 202 on the front side of the crystalline silicon substrate 201, and an N-type amorphous silicon layer 204 is mounted on the intrinsic amorphous silicon layer 202 on the back side of the crystalline silicon substrate 201.

[0034] The main grid electrode mechanism 3 is distributed on the front of several battery mechanisms 2;

[0035] The gridless electrode mechanism 3 includes several fine grid lines 301 distributed on the front side of the P-type amorphous silicon layer 203. The edges of the ends of each fine grid line 301 are connected by a busbar 302. The fine grid line 301 adopts a variable cross-section structure, with the cross-section of the fine grid line 301 near the edge of the battery mechanism 2 being increased.

[0036] In the design of the fine grid line 301, a variable cross-section structure is adopted to reduce resistance loss during current transmission. Preferably, the cross-section of the fine grid line 301 is triangular, triangular-like, trapezoidal, or trapezoidal, and the structure of the fine grid line 301 includes, but is not limited to, the above-mentioned cross-sectional shapes.

[0037] As can be seen from the above, the light first passes through the sealing mechanism 4 at the top of the protective frame 1. The sealing mechanism 4 not only plays a protective role, but also ensures that the light passes through smoothly to a certain extent. After the light enters, it reaches the battery mechanism 2. The crystalline silicon substrate 201 in the battery mechanism 2 starts to work under the action of the heterojunction structure composed of the intrinsic amorphous silicon layer 202 and the P-type amorphous silicon layer 203 (front) and the intrinsic amorphous silicon layer 202 and the N-type amorphous silicon layer 204 (back). The light is absorbed by the crystalline silicon and excited to generate photogenerated carriers (electron-hole pairs). Due to the built-in electric field of the heterojunction, the photogenerated carriers are effectively separated. Electrons move to the N-type amorphous silicon layer 204 and holes move to the P-type amorphous silicon layer 203, completing the initial photoelectric conversion.

[0038] To efficiently collect and export these currents, the module employs a gridless electrode structure 3. This structure includes several fine grid lines 301 distributed on the front side of the P-type amorphous silicon layer 203. These fine grid lines 301 are closely arranged on the surface of the cell structure 2 to ensure that as much photogenerated current as possible can be captured. The end edge of each fine grid line 301 is connected by a bus bar 302. In this way, the current collected from each fine grid line 301 can be aggregated through the bus bar 302 and finally exported to the external circuit, thereby realizing the output of the electrical energy generated by the cell module to the electrical equipment or the power grid, completing the entire power generation process.

[0039] As attached Figure 1 Appendix Figure 2 and attached Figure 3 As shown:

[0040] Specifically, regarding the aforementioned sealing mechanism 4, the sealing mechanism 4 includes a front cover plate 401 mounted on the top of the protective frame 1. A light-transmitting layer 403 is mounted on the front of the front cover plate 401, and several bolts 402 are distributed on the front of the front cover plate 401 surrounding the light-transmitting layer 403.

[0041] As can be seen from the above, after the bolt 402 passes through the front cover plate 401 and is connected to the protective frame 1, the front cover plate 401 can press and limit the edge parts of the battery mechanism 2 and the gridless electrode mechanism 3. After assembly, the light is guided through the light-transmitting layer 403.

[0042] As attached Figure 1 and attached Figure 3 As shown:

[0043] Specifically, regarding the aforementioned sealing mechanism 4, the light-transmitting layer 403 is made of ultra-white tempered glass with high light transmittance, and the top of the protective frame 1 is provided with screw holes corresponding to the bolts 402.

[0044] As can be seen from the above, compared with ordinary glass, the light-transmitting layer 403 made of ultra-white tempered glass with high light transmittance allows a large amount of light to pass through smoothly to the battery structure 2, greatly reducing the loss of light at the cover plate. Light is the basis of photovoltaic power generation. More light entering means that the battery structure 2 can absorb more energy and excite more photogenerated charge carriers, thereby providing a sufficient energy source for the photoelectric conversion of the battery structure 2. It can also maintain stable performance under different temperature and humidity conditions and will not deform, discolor or degrade due to long-term exposure to the natural environment.

[0045] The screw holes on the protective frame 1 provide a connection structure for the assembly of bolt 402, making assembly easier.

[0046] As attached Figure 1 and attached Figure 2 As shown:

[0047] Specifically, regarding the aforementioned protective frame 1, an insulating isolation strip 5 surrounds the inner wall of the protective frame 1;

[0048] A junction box 6 is fitted on one side of the protective frame 1, and a connecting wire 7 is installed at the end of the junction box 6.

[0049] As can be seen from the above, the junction box 6 acts as a connector, leading out the current generated by the photovoltaic module through the terminal block and connector, and then guiding it into the electrical equipment such as the inverter or DC combiner box through the connecting wire 7, thereby completing the power transmission. The insulating isolation strip 5 can isolate and protect the battery mechanism 2 and the gridless electrode mechanism 3 from the protective frame 1.

[0050] As attached Figure 3 As shown:

[0051] Example 2: This example is basically the same as the previous example, except that a mounting base 8 is installed at the bottom of the protective frame 1, and a mounting hole is opened at the bottom of the mounting base 8.

[0052] As can be seen from the above, the mounting base 8 can provide a connection structure for the assembly of the protective frame 1 and the external structure during use. The mounting holes opened on the mounting base 8 can make the connection between the protective frame 1 and the external structure more stable.

[0053] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0054] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0057] The above content is only a preferred embodiment of this utility model. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the ideas of this technical content. As long as these changes do not depart from the concept of this utility model, they all fall within the protection scope of this patent.

Claims

1. A heterojunction gridless solar cell module, comprising a cell assembly and a gridless electrode assembly located on the front side of the cell assembly, characterized in that: The main gridless electrode mechanism includes a busbar and fine grid lines, wherein the busbar is an enclosed annular structure, the fine grid lines are located inside the busbar, and the edges of the ends of each fine grid line are connected by the busbar; The fine grid lines are variable cross-section wires.

2. The heterojunction gridless solar cell module according to claim 1, characterized in that: The width of the cross-section of the fine grid line near the edge of the battery structure is greater than the width of the main cross-section.

3. The heterojunction gridless solar cell module according to claim 2, characterized in that: The cross-section of the fine grid lines is triangular, triangular-like, trapezoidal, or trapezoidal.

4. The heterojunction gridless solar cell module according to claim 1, characterized in that: The fine grid lines intersect to form a mesh structure.

5. The heterojunction gridless solar cell module according to claim 1, characterized in that: The heterojunction gridless battery module also includes a protective frame, the top of which is fitted with a light-transmitting sealing mechanism, and the battery assembly is installed inside the protective frame.

6. The heterojunction gridless solar cell module according to claim 5, characterized in that: The sealing mechanism includes a front cover plate mounted on the top of the protective frame. A light-transmitting layer is mounted on the front of the front cover plate, and several bolts are distributed on the front of the front cover plate around the light-transmitting layer.

7. The heterojunction gridless solar cell module according to claim 1, characterized in that: The battery structure includes a crystalline silicon substrate, on the front and back sides of which intrinsic amorphous silicon layers are mounted. A P-type amorphous silicon layer is mounted on the intrinsic amorphous silicon layer on the front side of the crystalline silicon substrate, and an N-type amorphous silicon layer is mounted on the intrinsic amorphous silicon layer on the back side of the crystalline silicon substrate.

8. The heterojunction gridless solar cell module according to claim 5, characterized in that: An insulating barrier strip surrounds the inner wall of the protective frame.

9. The heterojunction gridless solar cell module according to claim 5, characterized in that: A junction box is fitted on one side of the protective frame, and a connecting wire is installed at the end of the junction box.

10. The heterojunction gridless solar cell module according to claim 5, characterized in that: The bottom of the protective frame is equipped with a mounting base, and the bottom of the mounting base has a mounting hole.

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