Back contact cell edge corner gate line structure
By adding alternating first and second polarity grid structures at the corner of the back contact battery edge, the problem of excessively long carrier transport distance is solved, thereby improving carrier collection performance and battery performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENGDIAN GRP DMEGC MAGNETICS CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-07-21
AI Technical Summary
In the traditional back-contact battery edge corner grid line design, the carrier transport distance is relatively long, which leads to increased transmission resistance and affects battery performance.
First and second polarity grid structures are added at the corner of the back contact battery edge, so that grid lines of different polarities are alternately distributed in the horizontal/vertical direction, shortening the distance from the end of the sub-grid and grid to the main grid.
By shortening the carrier transport distance, reducing transport losses, improving carrier collection performance, and increasing the fill factor (FF value) of the battery.
Smart Images
Figure CN224538650U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the photovoltaic field, and in particular to a back contact battery edge corner grid structure. Background Technology
[0002] Back-contact solar cells are a common type of solar cell. By moving the front-side grid lines to the back, they avoid the light loss caused by shading from the front electrodes of conventional cells. Since grid lines of different polarities are located on the back of the cell, the overall grid pattern design becomes crucial. Theoretically, to facilitate carrier extraction within the back-contact cell, the positive (p-region) and negative (n-region) grid lines should be designed to alternate on the back of the cell (otherwise, transmission performance would be limited), and the corresponding sub-grid length should also be relatively short. However, current traditional back-contact cell edge corner grid designs still suffer from long carrier transport distances. For example... Figure 2 As shown, its sub-grid is relatively long, and the distance from the end of the sub-grid to the main grid it is connected to is relatively long. Since the grid line itself has a large line resistance loss, this will significantly increase the transmission resistance, reduce the FF value of the battery, and hinder further improvement of battery performance.
[0003] Therefore, it is necessary to continue to design and optimize the edge grid line structure of the back contact battery, so as to further shorten the distance of carrier transport from the edge corner grid line to the main grid. Utility Model Content
[0004] To address the aforementioned technical problems, this invention provides a grid line structure at the edge corner of a back-contact battery. Firstly, this invention shortens the length of the secondary grid at the edge corner of the back-contact battery, thereby reducing transmission losses and improving carrier collection performance. Secondly, this invention can be further designed so that grid lines of different polarities are alternately and symmetrically distributed in both the horizontal and vertical directions, facilitating carrier separation and collection. Both of these modifications significantly improve the performance of the back-contact battery.
[0005] The specific technical solution of this utility model includes: a back contact battery edge corner grid structure, wherein the back contact battery edge corner is provided with:
[0006] First polarity sub-gate, and first polarity branch gate connected to the first polarity sub-gate;
[0007] The second polar main gate, the second polar edge connection line connected to the second polar main gate, the second polar PAD point connected to the second polar edge connection line, the second polar sub-gate connected to the second polar PAD point, and the second polar branch gate connected to at least one of the second polar main gate, the second polar edge connection line, the second polar PAD point, and the second polar sub-gate.
[0008] Among them, the structures with the first polarity (including the first polarity main gate, the first polarity sub-gate, and the first polarity branch gate) and the structures with the second polarity (including the second polarity main gate, the second polarity edge connecting line, the second polarity PAD point, the second polarity sub-gate, and the second polarity branch gate) are arranged in an alternating distribution structure (that is, each structure with the first polarity is adjacent to a structure with the second polarity, and there are gaps between them).
[0009] This invention features the aforementioned optimized design of the grid line structure at the edge of the back-contact battery, particularly by innovatively adding first and second polarity branch grid structures. With the auxiliary extension of these first and second polarity branch grid structures, the original length of the sub-grid can be effectively shortened. Under the same size conditions, due to the increased distribution density, the distance from the end of each sub-grid and branch grid to its corresponding main grid can be significantly reduced. Therefore, this design shortens the distance that carriers at the ends of the sub-grids / branch grids can travel to the main grid, thereby achieving the goal of reducing transmission losses and improving collection performance.
[0010] In some implementations, there are multiple first polar sub-gates. There are multiple first polar branch gates.
[0011] Multiple first polarity sub-gates and / or first polarity branch gates can be designed according to actual needs, thereby achieving controllable adjustment of the distance from the end of the sub-gate / branch gate to its corresponding main gate.
[0012] In some implementations, the shape of the first polar grid includes a straight line, a right angle, or a curve.
[0013] The above structure facilitates the realization of a symmetrical structure, which in turn makes it easier to separate and collect charge carriers.
[0014] In some implementations, the shapes of two adjacent first polar sub-gates and their connected first polar branch gates are symmetrical (i.e., the shape of the whole consisting of a certain first polar sub-gate and its connected first polar branch gate is symmetrical with the shape of the whole consisting of another adjacent first polar sub-gate and its connected first polar branch gate).
[0015] Based on the aforementioned addition of first and second polarity grid structures, the grid lines of different polarities can be further designed to be basically in an alternating symmetrical distribution structure in the horizontal and vertical directions, which is more conducive to the separation and collection of charge carriers.
[0016] In some implementations, there are multiple second polar sub-gates. There are multiple second polar branch gates.
[0017] Multiple first polarity sub-gates and / or first polarity branch gates can be designed according to actual needs, thereby achieving controllable adjustment of the distance from the end of the sub-gate / branch gate to its corresponding main gate.
[0018] In some implementations, the shape of the second polar grid includes a straight line, a right angle, or a curve.
[0019] The above structure facilitates the realization of a symmetrical structure, which in turn makes it easier to separate and collect charge carriers.
[0020] In some implementations, the first polarity gate and the second polarity gate are alternately distributed (i.e., adjacent to each gate are gates with opposite polarities).
[0021] In some more preferred embodiments, the alternating distribution is an alternating distribution in the horizontal and / or vertical directions.
[0022] Compared with the prior art, the beneficial effects of this utility model are:
[0023] (1) This utility model innovatively adds first and second polarity branch gate structures. With the auxiliary extension of the first and second polarity branch gate structures, the length of the original sub-gate can be effectively shortened. Under the same size conditions, the distance from the end of each sub-gate and branch gate to its corresponding main gate can be significantly shortened. Therefore, the above design can shorten the distance of carrier transmission from the end of the sub-gate / branch gate to the main gate, thereby achieving the purpose of reducing transmission loss and improving collection performance.
[0024] (2) This utility model can be further designed so that the grid lines of different polarities are basically in an alternating symmetrical distribution structure in the horizontal / vertical directions, which is more conducive to the separation and collection of charge carriers. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of a back contact battery edge corner grid line structure in Embodiment 1 of this utility model.
[0026] Figure 2 This is a schematic diagram of a traditional back-contact battery edge corner grid junction structure in the prior art.
[0027] The attached figures are labeled as follows: 1 for the first polarity sub-gate, 2 for the second polarity sub-gate, 3 for the second polarity PAD point, 4 for the second polarity main gate, 5 for the second polarity edge connecting line, 6 for the first polarity branch gate, and 7 for the second polarity branch gate. Detailed Implementation
[0028] The present invention will be further described below with reference to embodiments. Unless otherwise specified, all devices, connection structures, and methods involved in this invention are known in the art.
[0029] General Implementation Examples
[0030] A back-contact battery edge corner grid structure, wherein the following is provided at the edge corner of the battery back side:
[0031] A first polarity main gate, a first polarity secondary gate connected to the first polarity main gate, and a first polarity branch gate connected to the first polarity secondary gate.
[0032] The second polar main gate, the second polar edge connection line connected to the second polar main gate, the second polar PAD point connected to the second polar edge connection line, the second polar sub-gate connected to the second polar PAD point, and the second polar branch gate connected to at least one of the second polar main gate, the second polar edge connection line, the second polar PAD point, and the second polar sub-gate.
[0033] Among them, the structures with the first polarity (including the first polarity main gate, the first polarity sub-gate, and the first polarity branch gate) and the structures with the second polarity (including the second polarity main gate, the second polarity edge connecting line, the second polarity PAD point, the second polarity sub-gate, and the second polarity branch gate) are arranged in an alternating distribution structure (that is, each structure with the first polarity is adjacent to a structure with the second polarity, and there are gaps between them).
[0034] This invention optimizes the corner grid structure of a back-contact battery by innovatively adding first and second polarity branch grid structures. The extension of these branch grid structures effectively shortens the original length of the sub-grid. Under the same size conditions, due to the increased distribution density, the distance from the end of each sub-grid and branch grid to its corresponding main grid is significantly reduced. Therefore, this design shortens the distance carriers travel from the end of the sub-grid to the main grid, thereby reducing transmission loss and improving collection performance.
[0035] In some implementations, there are multiple first polar subgates.
[0036] In some implementations, the number of the first polar gates is multiple.
[0037] In some implementations, the shape of the first polar grid includes a straight line, a right angle, or a curve.
[0038] In some implementations, the shapes of two adjacent first polar sub-gates and their connected first polar branch gates are symmetrical (i.e., the shape of the whole consisting of a certain first polar sub-gate and its connected first polar branch gate is symmetrical with the shape of the whole consisting of another adjacent first polar sub-gate and its connected first polar branch gate).
[0039] In some implementations, there are multiple second polar subgates.
[0040] In some implementations, there are multiple second polarity gates.
[0041] In some implementations, the shape of the second polar grid includes a straight line, a right angle, or a curve.
[0042] In some implementations, the first polarity gate and the second polarity gate are alternately distributed (i.e., adjacent to each gate are gates with opposite polarities).
[0043] In some more preferred embodiments, the alternating distribution is an alternating distribution in the horizontal and / or vertical directions. Specific Implementation
[0045] Example 1
[0046] like Figure 1 As shown: A back-contact battery edge corner grid structure, wherein the following is provided at the edge corner of the battery back side:
[0047] The structure exhibiting a second polarity includes: a second polarity main grid located at the corner of the rear edge of the battery (in Figure 1 (The middle is a vertical straight line), and the second polarity edge connection line connected to the second polarity main gate (in Figure 1 The middle part is a horizontal straight line; the second polarity PAD point connected to the second polarity edge connection line (in Figure 1 (The middle part is rectangular); two second polarity sub-gates connected to the second polarity PAD point ( Figure 1 The two poles are located on either side of the longitudinal direction of the second polarity PAD point; the four linear second polarity branch grids are connected to the second polarity main grid and the second polarity edge connection line respectively. Figure 1 In this structure, two second polarity grids are arranged horizontally in parallel and connected to the second polarity main grid; two second polarity grids are arranged vertically and connected to the second polarity edge connecting line. These two vertically arranged second polarity grids and the second polarity edge connecting line form a cross-shaped structure.
[0048] The structure exhibiting first polarity includes: two first polarity sub-gates (in...) Figure 1 The first polar sub-gate is arranged in a straight line, horizontally parallel, and symmetrically distributed on the upper and lower sides of the second polar sub-gate. The first polar sub-gate is connected to the first polar main gate. Figure 1 The first polarity main gate is not shown (it is located to the right of the first polarity sub-gate). Each first polarity sub-gate is connected to two right-angled first polarity branch gates. Figure 1 The structure adjacent to each first polarity branch is a second polarity structure (including second polarity main grid, second polarity sub-grid, straight second polarity branch grid, and second polarity edge connecting line).
[0049] Furthermore, the shapes of two adjacent first polarity sub-gates and their connected first polarity branches are symmetrical (i.e., the shape of the whole consisting of a certain first polarity sub-gate and its connected first polarity branches is symmetrical with the shape of the whole consisting of another first polarity sub-gate and its connected first polarity branches adjacent to it). The first polarity branches and the second polarity branches are alternately distributed in the transverse and / or longitudinal directions (i.e., the branches adjacent to each branch are all of opposite polarity). Thus, the structure with the first polarity as a whole (including the first polarity main gate, the first polarity sub-gate, and the first polarity branch) and the structure with the second polarity (including the second polarity main gate, the second polarity edge connecting line, the second polarity PAD point, the second polarity sub-gate, and the second polarity branch) are alternately distributed (i.e., the structure adjacent to each structure with the first polarity is a structure with the second polarity, and there are gaps between them).
[0050] In this embodiment, the lengths of the first polar sub-gate 1, the second polar sub-gate 2, the second polar edge connecting line 5, the first polar branch gate 6 (divided into straight type and right angle type), and the second polar branch gate 7 are 9 mm, 5 mm, 3 mm, 2 mm, and 1 mm, respectively; while in the same area, such as Figure 2 In the back contact battery edge corner grid line structure shown, the lengths of the first polarity sub-grid 1, the second polarity sub-grid 2, and the second polarity edge connecting line 5 are 13 mm, 8 mm, and 3 mm, respectively.
[0051] This invention optimizes the corner grid structure of a back-contact battery by innovatively adding first and second polarity branch grid structures. The extension of these branch grid structures effectively shortens the original length of the sub-grid. Under the same size conditions, due to the increased distribution density, the distance from the end of each sub-grid and branch grid to its corresponding main grid is significantly reduced. Therefore, this design shortens the distance carriers travel from the end of the sub-grid to the main grid, thereby reducing transmission loss and improving collection performance.
[0052] Example 2
[0053] The difference between Example 2 and Example 1 is that the shape of the right-angled first polar branch is replaced with a curved structure, as detailed below:
[0054] A back-contact battery edge corner grid structure, wherein the following is provided at the edge corner of the battery back side:
[0055] The structure exhibiting a second polarity includes: a second polarity main grid (vertically straight) located at the corner of the back edge of the battery; a second polarity edge connecting line (horizontally straight) connected to the second polarity main grid; a second polarity PAD point (rectangular) connected to the second polarity edge connecting line; two second polarity sub-grids connected to the second polarity PAD point (located on both sides of the second polarity PAD point); and four straight second polarity branch grids connected to the second polarity main grid and the second polarity edge connecting line respectively (two of the second polarity branch grids are arranged horizontally in parallel and connected to the second polarity main grid; two of the second polarity branch grids are arranged vertically and connected to the second polarity edge connecting line, and these two vertically arranged second polarity branch grids and the second polarity edge connecting line form a cross-shaped structure).
[0056] The structure exhibiting the first polarity includes: two first polarity sub-gates (arranged in a straight, horizontally parallel manner and symmetrically distributed on the vertical upper and lower sides of the second polarity sub-gate), the first polarity sub-gates being connected to the first polarity main gate (located to the right of the first polarity sub-gate), and each first polarity sub-gate being connected to two curved first polarity branch gates, with a structure exhibiting the second polarity adjacent to each first polarity branch gate (including the second polarity main gate, the second polarity sub-gate, the straight-line second polarity branch gates, and the second polarity edge connecting line).
[0057] Furthermore, the shapes of two adjacent first polarity sub-gates and their connected first polarity branches are symmetrical (i.e., the shape of the whole consisting of a certain first polarity sub-gate and its connected first polarity branches is symmetrical with the shape of the whole consisting of another first polarity sub-gate and its connected first polarity branches adjacent to it). The first polarity branches and the second polarity branches are alternately distributed in the transverse and / or longitudinal directions (i.e., the branches adjacent to each branch are all of opposite polarity). Thus, the structure with the first polarity as a whole (including the first polarity main gate, the first polarity sub-gate, and the first polarity branch) and the structure with the second polarity (including the second polarity main gate, the second polarity edge connecting line, the second polarity PAD point, the second polarity sub-gate, and the second polarity branch) are alternately distributed (i.e., the structure adjacent to each structure with the first polarity is a structure with the second polarity, and there are gaps between them).
[0058] Example 3
[0059] The difference between Example 3 and Example 1 is that: a second polar sub-gate is also provided on the second polar sub-gate, as detailed below:
[0060] A back-contact battery edge corner grid structure, wherein the following is provided at the edge corner of the battery back side:
[0061] The structure exhibiting a second polarity includes: a second polarity main grid (vertically straight) located at the corner of the back edge of the battery; a second polarity edge connecting line (horizontally straight) connected to the second polarity main grid; a second polarity PAD point (rectangular) connected to the second polarity edge connecting line; two second polarity sub-grids connected to the second polarity PAD point (located on both sides of the second polarity PAD point); and eight straight second polarity branch grids connected to the second polarity main grid, the second polarity edge connecting line, and the second polarity sub-grids respectively (two of the second polarity branch grids are arranged horizontally parallel and connected to the second polarity main grid; two of the second polarity branch grids are arranged vertically and connected to the second polarity edge connecting line, and these two vertically arranged second polarity branch grids and the second polarity edge connecting line form a cross-shaped structure; and four of the second polarity branch grids are arranged vertically, with two second polarity branch grids connected to each second polarity sub-grid).
[0062] The structure exhibiting a first polarity includes: two first polarity sub-gates (arranged horizontally in a straight line and symmetrically distributed on the upper and lower longitudinal sides of the second polarity sub-gate), the first polarity sub-gates being connected to the first polarity main gate (located to the right of the first polarity sub-gate), and each first polarity sub-gate being connected to two right-angled first polarity branch gates. Adjacent to each first polarity branch gate is a structure exhibiting a second polarity (including the second polarity main gate, the second polarity sub-gate, the straight-lined second polarity branch gates, and the second polarity edge connecting line). Simultaneously, each first polarity sub-gate is also connected to one straight-lined first polarity branch gate in a longitudinal direction, located in the middle of the two second polarity branch gates on the second polarity sub-gate, thus forming an alternating distribution structure.
[0063] Furthermore, the shapes of two adjacent first polarity sub-gates and their connected first polarity branches are symmetrical (i.e., the shape of the whole consisting of a certain first polarity sub-gate and its connected first polarity branches is symmetrical with the shape of the whole consisting of another first polarity sub-gate and its connected first polarity branches adjacent to it). The first polarity branches and the second polarity branches are alternately distributed in the transverse and / or longitudinal directions (i.e., the branches adjacent to each branch are all of opposite polarity). Thus, the structure with the first polarity as a whole (including the first polarity main gate, the first polarity sub-gate, and the first polarity branch) and the structure with the second polarity (including the second polarity main gate, the second polarity edge connecting line, the second polarity PAD point, the second polarity sub-gate, and the second polarity branch) are alternately distributed (i.e., the structure adjacent to each structure with the first polarity is a structure with the second polarity, and there are gaps between them).
[0064] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.
Claims
1. A grid line structure at the edge corner of a back-contact battery, characterized in that, The following features are located at the corner of the back edge of the battery: First polarity secondary gate, The first polarity branch gate connected to the first polarity sub-gate. Second polarity main gate, The second polarity edge connection line connects to the second polarity main gate. The second polarity PAD point is connected to the second polarity edge connection line. The second polarity sub-gate connects to the second polarity PAD point. A second polarity branch gate that connects at least one of the second polarity main gate, the second polarity edge connection line, the second polarity PAD point, and the second polarity sub-gate; Structures exhibiting primary polarity and structures exhibiting secondary polarity are distributed alternately.
2. The back contact battery edge corner grid line structure according to claim 1, characterized in that: There are multiple first polar subgates.
3. The back contact battery edge corner grid line structure according to claim 1 or 2, characterized in that: The number of the first polarity gates is multiple.
4. The back contact battery edge corner grid line structure according to claim 1, characterized in that: The shape of the first polar grid includes a straight line, a right angle, or a curve.
5. The back contact battery edge corner grid line structure according to claim 2, characterized in that: The two adjacent first polar sub-gates and their connected first polar sub-gates are symmetrical in shape as a whole.
6. The back contact battery edge corner grid line structure according to claim 1, characterized in that: The number of second polar subgates is multiple.
7. The back contact battery edge corner grid line structure according to claim 1 or 6, characterized in that: The number of the second polarity gates is multiple.
8. The back contact battery edge corner grid line structure according to claim 1, characterized in that: The shape of the second polarity grid includes a straight line, a right angle, or a curve.
9. The back contact battery edge corner grid line structure according to claim 1, characterized in that: The first polarity gate and the second polarity gate are alternately distributed.
10. The back contact battery edge corner grid line structure according to claim 9, characterized in that: The alternating distribution is an alternating distribution in the horizontal and / or vertical directions.