Back contact cell edge grid line structure

Abstract

The utility model relates to photovoltaic field discloses a kind of back contact cell edge grid line structure, comprising: first polarity main grid, the first polarity auxiliary grid connected with first polarity main grid, the first polarity extension auxiliary grid connected with first polarity auxiliary grid, second polarity main grid, the second polarity PAD point connected with second polarity main grid by second polarity PAD point connecting wire, the second polarity auxiliary grid connected with second polarity PAD point connecting wire, the second polarity extension auxiliary grid connected with second polarity auxiliary grid and / or second polarity PAD point;The grid line of first polarity is distributed with the grid line of second polarity and is distributed alternately.The utility model is designed by grid line structure optimization, greatly shorten the length of auxiliary grid at back contact cell edge, to improve carrier collection capability by reducing transmission loss, finally reach the purpose of improving the performance of back contact cell.

Description

Technical Field

[0001] This utility model relates to the photovoltaic field, and in particular to a back contact battery edge grid line structure. Background Technology

[0002] Back-contact batteries avoid light loss due to shading of the front electrodes by moving the front grid lines to the back side, as is common in conventional batteries. Since grid lines of different polarities are located on the back side of the battery, the overall grid pattern design becomes crucial. To facilitate the extraction of charge carriers within the back-contact battery and improve transport performance, the positive (p-region) and negative (n-region) grid lines on the back side are typically designed with an interdigitated structure. However, in existing technologies, the positive and negative grid lines (especially the sub-grid) at the edges of conventional back-contact batteries are relatively long, resulting in a longer carrier transport distance. For example, in... Figure 4 In this process, the transmission distance between the sub-gate ends of the positive / negative electrodes and their corresponding main gates is relatively long, which significantly increases the transmission resistance and thus limits the performance of the back contact battery.

[0003] In summary, based on the existing traditional back contact battery structure, it is urgent to optimize the edge grid line structure of the back contact battery to shorten the edge sub-grid length, thereby further improving the performance of the back contact battery. Utility Model Content

[0004] To address the aforementioned technical problems, this invention provides a back-contact battery edge grid line structure. Through optimized grid line structure design, this invention significantly shortens the length of the secondary grid at the edge of the back-contact battery, thereby reducing transmission losses and improving carrier collection capability, ultimately enhancing the performance of the back-contact battery.

[0005] The specific technical solution of this utility model includes: a back-contact battery edge grid structure, wherein the back edge of the battery is provided with:

[0006] First polarity main gate

[0007] The first polarity secondary gate is connected to the first polarity primary gate.

[0008] The first polarity extension sub-gate connected to the first polarity sub-gate.

[0009] Second polarity main gate,

[0010] Connect the second polarity PAD point of the second polarity main gate via the second polarity PAD point connection line.

[0011] The second polarity sub-gate connecting the second polarity PAD point.

[0012] A second polarity extension subgate connecting the second polarity subgate and / or the second polarity PAD point;

[0013] The grid lines with the first polarity and the grid lines with the second polarity are distributed alternately.

[0014] In the above structure, the gate lines of the first polarity (including the first polarity main gate, the first polarity sub-gate, and the first polarity extended sub-gate) and the gate lines of the second polarity (including the second polarity main gate, the second polarity sub-gate, and the second polarity extended sub-gate) are distributed alternately in an overall manner (that is, each gate line adjacent to the first polarity gate line is a second polarity gate line, and there are gaps between them). This invention, through optimized gate line structure design, especially with the auxiliary extension of the first and second polarity extended sub-gates, under the same size conditions, due to the increased distribution density, the end distance of each sub-gate and extended sub-gate is closer to the main gate it connects to, effectively shortening the length of the sub-gate, thereby reducing transmission loss and improving carrier collection capability.

[0015] In one implementation, there are multiple first polarity subgates and multiple second polarity subgates. There are also multiple first polarity extended subgates and multiple second polarity extended subgates.

[0016] The number of the above-mentioned gate lines can be confirmed according to actual needs, thereby enabling controllable adjustment of the distance from the end of the sub-gate / extended sub-gate to its corresponding main gate.

[0017] In one implementation, the first polar main gate and the second polar main gate are arranged in parallel; the second polar PAD point is located between the first polar main gate and the second polar main gate.

[0018] In one implementation, the second polarity PAD point connection line is arranged perpendicularly to the second polarity main gate; the second polarity sub-gate is arranged parallel to the second polarity main gate.

[0019] In one implementation, the second polarity extension sub-gate is disposed perpendicularly to the second polarity sub-gate and extends toward the first polarity main gate.

[0020] In one implementation, the first polar sub-gate is perpendicular to the first polar main gate and extends toward the second polar main gate.

[0021] In one embodiment, the first polarity extension sub-gate is disposed perpendicularly to the first polarity sub-gate and extends towards the connection line of the second polarity PAD point. In another embodiment, the first polarity sub-gate and the second polarity extension sub-gate are distributed alternately.

[0022] In one implementation, a second polarity extension sub-gate is connected to the second polarity PAD point via a second polarity sub-gate connection line.

[0023] By setting up a second polarity sub-gate connection line above and below the second polarity PAD point, the distance that the second polarity sub-gate carriers near the second polarity PAD point can be transported to the second polarity PAD point can be further shortened, reducing the loss of these carriers on the gate line and helping to further improve electrical performance.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] (1) Through the optimized design of the grid line structure, especially with the auxiliary extension of the first and second polarity extended sub-gates, under the same size conditions, due to the increase in distribution density, the end distance of each sub-gate and the extended sub-gate is closer to the main gate it is connected to, which effectively shortens the length of the sub-gate, thereby reducing transmission loss and improving the carrier collection capability.

[0026] (2) In this invention, the grid lines with the first polarity and the grid lines with the second polarity are distributed alternately as a whole, which is more conducive to the separation and collection of charge carriers. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the back contact battery edge grid line structure in Embodiment 1 of this utility model.

[0028] Figure 2 This is a schematic diagram of the back contact battery edge grid line structure in Embodiment 2 of this utility model.

[0029] Figure 3 This is a schematic diagram of the back contact battery edge grid line structure in Embodiment 3 of this utility model.

[0030] Figure 4 This is a schematic diagram of a traditional back-contact battery edge grid structure.

[0031] The attached figures are labeled as follows: first polarity sub-gate 1, second polarity sub-gate 2, second polarity PAD point 3, second polarity main gate 4, second polarity PAD point connecting line 5, first polarity main gate 6, second polarity sub-gate connecting line 7, first polarity extended sub-gate 8, and second polarity extended sub-gate 9. Detailed Implementation

[0032] 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.

[0033] General Implementation Examples

[0034] A back-contact battery edge grid structure, wherein the battery back edge is provided with:

[0035] First polarity main gate

[0036] The first polarity secondary gate is connected to the first polarity primary gate.

[0037] The first polarity extension sub-gate connected to the first polarity sub-gate.

[0038] Second polarity main gate,

[0039] Connect the second polarity PAD point of the second polarity main gate via the second polarity PAD point connection line.

[0040] The second polarity sub-gate connecting the second polarity PAD point.

[0041] A second polarity extension subgate connecting the second polarity subgate and / or the second polarity PAD point;

[0042] The grid lines with the first polarity and the grid lines with the second polarity are distributed alternately.

[0043] In some specific implementations, there are multiple first polarity subgates and multiple second polarity subgates. There are also multiple first polarity extended subgates and multiple second polarity extended subgates.

[0044] In some specific implementation cases, the first polarity gate and the second polarity gate are arranged in parallel; the second polarity PAD point is located between the first polarity gate and the second polarity gate.

[0045] In some specific implementation cases, the connecting line of the second polarity PAD point is set perpendicular to the second polarity main gate; the second polarity sub-gate is set parallel to the second polarity main gate.

[0046] In some specific implementation cases, the second polarity extension sub-gate is arranged perpendicularly to the second polarity sub-gate and extends towards the first polarity main gate.

[0047] In some specific implementation cases, the first polar sub-gate is perpendicular to the first polar main gate and extends towards the second polar main gate.

[0048] In some specific implementations, the first polarity extension sub-gate is arranged perpendicularly to the first polarity sub-gate and extends towards the connection line of the second polarity PAD point. As one implementation, the first polarity sub-gate and the second polarity extension sub-gate are distributed alternately.

[0049] In some preferred embodiments, a second polarity extension sub-gate is connected to the second polarity PAD point via a second polarity sub-gate connection line. Specific Implementation

[0051] Example 1

[0052] A back-contact battery edge grid line structure, such as Figure 1 As shown, the following is provided at the edge of the back contact battery:

[0053] lie in Figure 1 The first polar main gate 6 is located on the right side of the first polar main gate. Eight equidistant and parallel first polar sub-gates 1 (perpendicular to the first polar main gate and extending to the left) are connected to the left side of the first polar main gate. At the ends of the two first polar sub-gates on the upper and lower sides, one first polar extension sub-gate 8 (perpendicular to the first polar sub-gate and extending in the direction of the first polar sub-gate) is connected to each other.

[0054] lie in Figure 1 The second polarity main gate 4 (parallel to the first polarity main gate) is located on the left side. A second polarity PAD connection line 5 (perpendicular to the second polarity main gate and extending towards the first polarity main gate) is connected to the right side of the second polarity main gate. One end of the second polarity PAD connection line connects to a second polarity PAD point 3 (the second polarity PAD point is rectangular and located between the first and second polarity main gates). Two second polarity sub-gates 2 (perpendicular to the PAD connection line) are connected to the upper and lower sides of the second polarity PAD connection line, and each second polarity sub-gate has a second polarity extension sub-gate 9 (parallel to the second polarity main gate and extending towards the first polarity main gate) connected to its end. Three parallel second polarity extension sub-gates (parallel to the second polarity sub-gates) are connected to the right side of the second polarity PAD point.

[0055] Overall, the gate lines with the first polarity and the gate lines with the second polarity are distributed alternately, that is, the first polarity sub-gates and the second polarity extended sub-gates are distributed alternately; the first polarity extended sub-gates and the second polarity sub-gates are distributed alternately.

[0056] In this embodiment, located Figure 1 The length of the first polar sub-gate at the top and bottom is 9.7 mm, and the length of the first polar extension sub-gate connected to its end is 1.3 mm; located in Figure 1 The length of the first polar sub-gate at the top and bottom is 9.3 mm, and the length of the first polar extension sub-gate connected to its end is 1.1 mm; the length of the four parallel first polar sub-gates in the middle is 7.0 mm.

[0057] lie in Figure 1 The two leftmost second polar sub-gates are 1.2 mm long, and the second polar extension sub-gate at their connecting ends is 9.5 mm long; located at Figure 1The two second polarity sub-gates on the right side of the center have a length of 1.0 mm, and the second polarity extension sub-gates connected to their ends have a length of 9.1 mm; the three second polarity extension sub-gates connected to the right side of the second polarity PAD point have a length of 7.0 mm. The length of the connecting line to the second polarity PAD point is 1.6 mm.

[0058] Under the same area conditions, such as Figure 4 In the back contact battery edge grid line structure shown, the length of the first polarity sub-grid is 13.5 mm, the length of the second polarity sub-grid is 9.5 mm, and the length of the second polarity PAD point connection line is 1.6 mm.

[0059] and Figure 4 Compared to traditional back-contact battery grid line structures, Figure 1 The length of the intermediate gate line can be further shortened, resulting in less carrier transport loss and improved carrier collection performance. Meanwhile, if the length of the connection line between the second polarity PAD points is further increased... Figure 1 The solution can be easily achieved by extending the length of the sub-gate corners. Furthermore, the length of the connecting line between the second polarity PAD points can be adjusted by changing the number of sub-gate corner positions. Overall, compared to... Figure 4 The solution is more advantageous and simpler.

[0060] In summary, this utility model significantly shortens the length of the secondary grid at the edge of the back contact battery through optimized grid structure design, thereby improving carrier collection capability by reducing transmission loss and ultimately achieving the goal of improving the performance of the back contact battery.

[0061] Example 2

[0062] The difference between Example 2 and Example 1 lies in the number and location of sub-gates or extended sub-gates of different polarities, as detailed below:

[0063] A back-contact battery edge grid line structure, such as Figure 2 As shown, the following is provided at the edge of the back contact battery:

[0064] lie in Figure 2 The first polar main gate 6 is located on the right side of the first polar main gate. Seven equidistant and parallel first polar sub-gates 1 are connected to the left side of the first polar main gate (the first polar main gates are perpendicular to each other and extend to the left). The ends of the two first polar sub-gates on the upper and lower sides are each connected to a first polar extension sub-gate 8 (perpendicular to the first polar sub-gates and extending towards the direction of the second polar PAD point connection line).

[0065] lie in Figure 2The second polarity main gate 4 (parallel to the first polarity main gate) is located on the left side. A second polarity PAD connection line 5 (perpendicular to the second polarity main gate and extending towards the first polarity main gate) connects to the right side of the second polarity main gate. A second polarity PAD point 3 (rectangular, located between the first and second polarity main gates) connects to the right side of the second polarity PAD connection line. Two second polarity sub-gates 2 (perpendicular to the PAD connection line) are connected to the upper and lower sides of the second polarity PAD connection line, and a second polarity extension sub-gate 9 (parallel to the second polarity main gate and extending towards the first polarity main gate) connects to the end of each second polarity sub-gate. Four parallel second polarity extension sub-gates (parallel to the second polarity sub-gates) connect to the right side of the second polarity PAD point.

[0066] Overall, the gate lines with the first polarity and the gate lines with the second polarity are distributed alternately, that is, the first polarity sub-gates and the second polarity extended sub-gates are distributed alternately; the first polarity extended sub-gates and the second polarity sub-gates are distributed alternately.

[0067] Example 3

[0068] The difference between Example 3 and Example 1 is that a second polarity extension sub-gate is added on both the upper and lower sides of the second polarity PAD point, as detailed below:

[0069] A back-contact battery edge grid line structure, such as Figure 3 As shown, the following is provided at the edge of the back contact battery:

[0070] lie in Figure 3 The first polar main gate 6 is located on the right side of the first polar main gate. Eight equidistant and parallel first polar sub-gates 1 (the first polar main gate is vertical and extends to the left) are connected to the left side of the first polar main gate. At the ends of the two first polar sub-gates on the upper and lower sides, one first polar extension sub-gate 8 (perpendicular to the first polar sub-gate) is connected.

[0071] lie in Figure 3The second polarity main gate 4 (parallel to the first polarity main gate) is located on the left side. A second polarity PAD connection line 5 (perpendicular to the second polarity main gate and extending towards the first polarity main gate) connects to the right side of the second polarity main gate. A second polarity PAD point 3 (rectangular and located between the first and second polarity main gates) connects to the right side of the second polarity PAD connection line. A second polarity sub-gate 2 (perpendicular to the PAD connection line) connects to the top and bottom sides of each second polarity sub-gate, and a second polarity extension sub-gate 9 (parallel to the second polarity main gate and extending towards the first polarity main gate) connects to the end of each second polarity sub-gate. Three parallel second polarity extension sub-gates (parallel to the second polarity sub-gates) connect to the right side of each second polarity PAD point. Furthermore, the second polarity PAD point... Figure 3 On the top and bottom sides, there is a second polarity extension sub-gate 9 (parallel to the second polarity main gate and extending towards the first polarity main gate) connected by a second polarity sub-gate connecting line 7.

[0072] Overall, the gate lines with the first polarity and the gate lines with the second polarity are distributed alternately, that is, the first polarity sub-gates and the second polarity extended sub-gates are distributed alternately; the first polarity extended sub-gates and the second polarity sub-gates are distributed alternately.

[0073] compared to Figure 1 In terms of Figure 2 In this process, by setting up second polarity sub-gate connection lines 7 on the upper and lower sides of the second polarity PAD point, the distance that the second polarity sub-gate carriers on the side closer to the second polarity PAD point can be further shortened to the second polarity PAD point, reducing the loss of these carriers on the gate line and helping to further improve electrical performance.

[0074] Example 4

[0075] The difference between Example 4 and Example 1 is that the polarities of all first polarities and second polarities are opposite. That is, in Example 1, the first polarity is positive (i.e., p region) and the second polarity is negative (i.e., n region); while in Example 4, the first polarity is negative (i.e., n region) and the second polarity is positive (i.e., p region).

[0076] 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 back-contact battery edge grid line structure, characterized in that: include: First polarity main gate The first polarity secondary gate is connected to the first polarity primary gate. The first polarity extended sub-gate connected to the first polarity sub-gate, Second polarity main gate, The second polarity PAD point is connected to the second polarity main gate via the connecting line of the second polarity PAD point. The second polarity sub-gate connected to the second polarity PAD point by the connecting line. A second polarity extended subgate connected to the second polarity subgate and / or the second polarity PAD point; The first polarity grid lines and the second polarity grid lines are distributed alternately.

2. The structure as described in claim 1, characterized in that: The first polarity gate is parallel to the second polarity gate.

3. The structure as described in claim 2, characterized in that: The second polarity PAD point is located between the first polarity gate and the second polarity gate.

4. The structure as described in claim 3, characterized in that: The connecting line of the second polarity PAD point is perpendicular to the second polarity main gate.

5. The structure as described in claim 3 or 4, characterized in that: The second polarity sub-gate is parallel to the second polarity main gate.

6. The structure as described in claim 5, characterized in that: The second polarity extension sub-gate is perpendicular to the second polarity sub-gate and extends toward the first polarity main gate.

7. The structure as described in claim 2, characterized in that: The first polar sub-gate is perpendicular to the first polar main gate and extends toward the second polar main gate.

8. The structure as described in claim 2 or 7, characterized in that: The first polarity extension subgate is perpendicular to the first polarity subgate and extends toward the direction of the connection line of the second polarity PAD point.

9. The structure as described in claim 8, characterized in that: The first polar sub-gate and the second polar extended sub-gate are distributed alternately; The first polarity extended sub-gate and the second polarity sub-gate are distributed alternately.

10. The structure as described in claim 1, characterized in that: A second polarity extension sub-gate is connected to the second polarity PAD point via a second polarity sub-gate connection line.

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