Solar cell connecting strip and solar cell module
By using solar cell connecting strips with conductive layers and combined layer structures, the welding problem between busbars and connecting conductive components is solved, achieving high-precision welding and stable cell connection, and reducing the risk of poor soldering and warping.
Patent Information
- Application Number
- CN202423156783.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2034-12-19
AI Technical Summary
In existing solar cell modules, the welding of the busbars to the connecting conductive parts is prone to poor welding and warping, and the welding precision is not high, which can easily lead to microcracks in the cells.
A solar cell connector strip with a conductive layer and a combined layer structure is used. The conductive layer is located on the back of the cell, and the combined layer includes a conductive part and an insulating part. The conductive part and the insulating part are distributed alternately. The conductive part is electrically connected to the connecting conductive part, and the insulating part achieves polarity isolation to avoid the need to open clearance holes.
It improves welding precision, reduces the risk of incomplete welding and warping, ensures the stability of cell connections, and reduces the possibility of cell warping and microcracks.
Smart Images
Figure CN223786414U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to solar cell module technical field especially relates to a solar cell piece connecting strip and solar cell module. BACKGROUND
[0002] The solar cell module usually includes a plurality of cell pieces, the current generated by the cell piece is collected through the connecting conductive piece, the plurality of cell pieces are electrically connected through the connecting conductive piece, in order to further collect the current of the connecting conductive piece, the busbar is usually arranged between the cell pieces, the busbar is electrically connected with the connecting conductive piece, thereby achieving the purpose of collecting current. The busbar of the existing solar cell module is usually arranged in the connecting conductive piece away from the cell piece side, that is, in production, the connecting conductive piece is welded on the back of the cell piece first, and then the busbar is placed on the connecting conductive piece for welding. In order to avoid the short circuit of the connecting conductive piece with different polarity and the busbar connection, an insulating piece is usually arranged between the connecting conductive piece and the cell piece. In order to enable the connecting conductive piece with the same polarity to form electrical connection with the busbar above, a spaced avoiding hole is needed to be opened in the corresponding position of the insulating piece. This structure is not easy to form alignment between the busbar and the avoiding hole during welding, and the middle insulating piece will have part of arching, which is easy to cause virtual welding between the busbar and the connecting conductive piece, and the irregular shape of the insulating piece is also easy to cause heat stress concentration in the welding area, which is easy to cause the cell piece to warp, and further increase the risk of cell piece hidden crack. SUMMARY
[0003] The technical problem to be solved by the utility model is to provide a solar cell piece connecting strip, which can improve welding precision, reduce virtual welding and warping, and improve the quality of the assembly.
[0004] In order to solve the above technical problem, the utility model provides a solar cell piece connecting strip for collecting the current of a plurality of connecting conductive pieces, which comprises a conductive layer and a combination layer, the conductive layer is arranged on the back of the cell piece, the combination layer is arranged on the side of the conductive layer away from the cell piece, the connecting conductive piece comprises a first conductive piece and a second conductive piece, and the first conductive piece or the second conductive piece can be electrically connected with part of the combination layer.
[0005] The combination layer comprises a conductive part and an insulating part, one side of the conductive part can be electrically connected with the conductive layer, and the other side of the conductive part can be electrically connected with the first conductive piece or the second conductive piece.
[0006] When the conductive part is electrically connected with the first conductive piece, the second conductive piece is arranged on the insulating part, and when the conductive part is electrically connected with the second conductive piece, the first conductive piece is arranged on the insulating part.
[0007] As an improvement of the above-mentioned scheme, an insulating member is arranged between the conductive layer and the back surface of the solar cell piece, and the combined layer is arranged on the side of the conductive layer away from the insulating member.
[0008] As an improvement of the above-mentioned scheme, the width of the insulating member is not less than the width of the conductive layer, and the side of the connecting position of the first conductive member or the second conductive member and the conductive part can abut against the insulating member.
[0009] As an improvement of the above-mentioned scheme, the conductive part and the insulating part are arranged in a staggered manner, and the arrangement direction of the conductive part and the insulating part is perpendicular to the length direction of the first conductive member and the second conductive member.
[0010] As an improvement of the above-mentioned scheme, a plurality of welding points are arranged between the connecting conductive member and the solar cell piece, the first conductive member and the second conductive member are electrically connected to the solar cell piece through the welding points, and the conductive layer is arranged between two adjacent welding points.
[0011] As an improvement of the above-mentioned scheme, when the first conductive member abuts against the side of the conductive part away from the solar cell piece, the second conductive member abuts against the side of the insulating part away from the solar cell piece.
[0012] When the second conductive member abuts against the side of the conductive part away from the solar cell piece, the first conductive member abuts against the side of the insulating part away from the solar cell piece.
[0013] As an improvement of the above-mentioned scheme, the conductive layer comprises a conductive base material layer and an outer coating layer.
[0014] As an improvement of the above-mentioned scheme, the conductive part and the insulating part are different in color.
[0015] The utility model also provides a solar cell module, including the solar cell piece connecting strip as described above, still include a plurality of cell pieces and connecting conductive member, adjacent solar cell piece passes connecting conductive member electric connection, connecting conductive member along first direction is provided, solar cell piece connecting strip is located the back surface of solar cell piece and with connecting conductive member electric connection, connecting conductive member is connected in the side of solar cell piece connecting strip away from solar cell piece.
[0016] As an improvement to the above solution, the solar cell connecting strip includes a conductive layer and a composite layer. An insulating element is provided between the conductive layer and the back of the solar cell. The composite layer includes a conductive portion and an insulating portion, which are spaced apart from each other. One side of the conductive portion can be electrically connected to the conductive layer. The conductive portion and the insulating portion are arranged along a second direction, which intersects with the first direction. The connecting conductive element includes a first conductive element and a second conductive element. When the conductive portion is electrically connected to the first conductive element, the second conductive element is disposed on the insulating portion. When the conductive portion is electrically connected to the second conductive element, the first conductive element is disposed on the insulating portion.
[0017] Implementing this utility model has the following beneficial effects:
[0018] This utility model relates to a solar cell connecting strip located on the back of the solar cell for collecting current to connect conductive components. It comprises a conductive layer and a composite layer. The conductive layer, located on the back of the solar cell, transmits current. The composite layer includes a conductive portion and an insulating portion. One side of the conductive portion can be electrically connected to the conductive layer, and the other side can be electrically connected to either the first or second conductive component of the connecting component. Because the composite layer is located on the side of the conductive layer away from the solar cell, the first and second conductive components can be connected to the upper part of the solar cell connecting strip. The solar cell connecting strip does not require clearance holes; instead, the conductive portion connects to connecting conductive components of different polarities, and the insulating portion insulates the connecting conductive components of different polarities. Therefore, during welding, there is no need to align clearance holes; the first and second conductive components can be directly laid on the solar cell connecting strip. Welding is simple and precise, and there is no risk of incomplete welding. Furthermore, the regular shape of the solar cell connecting strip reduces the likelihood of thermal stress during welding, thus lowering the risk of warping and microcracks in the solar cell. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of the solar cell connecting strip and solar cell module of this utility model;
[0020] Figure 2 yes Figure 1 A magnified view of part A in the image;
[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the connection between the solar cell connecting strip and the connecting conductive component of this utility model;
[0022] Figure 4 This is a schematic diagram of the solar cell connecting strip structure of this utility model. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings. It is hereby declared that the terms "up," "down," "left," "right," "front," "back," "inner," and "outer," etc., appearing or about to appear in this document, are based solely on the accompanying drawings and are not intended to specifically limit this utility model.
[0024] See Figure 1 and Figure 2 This utility model discloses a solar cell connecting strip 10 for collecting current from multiple connecting conductive elements 20. Compared with traditional busbars for collecting current, the solar cell connecting strip 10 of this utility model is divided into at least two layers, including a conductive layer 1 and a combined layer 2. The conductive layer 1 is disposed on the back of the solar cell 30 and is conductive, capable of collecting and transmitting current. The combined layer 2 is disposed on the side of the conductive layer 1 away from the solar cell 30. The connecting conductive elements 20 include a first conductive element 201 and a second conductive element 202, which have different polarities. The solar cell connecting strip 10 also has different polarities. Conductors of different polarities are electrically connected to the solar cell connecting strip 10 of the corresponding polarity so that the solar cell connecting strip 10 of the corresponding polarity can collect the current of the conductive element of that polarity. To achieve the electrical connection, the first conductive element 201 or the second conductive element 202 can be partially electrically connected to the combined layer 2.
[0025] In the layout of a conventional solar cell module, the first conductive element 201 and the second conductive element 202 are typically arranged parallel to each other on the back side of the solar cell 30, which can collect and transmit currents of different polarities. The solar cell connecting strip 10 used to collect currents is typically arranged perpendicular to the first conductive element 201 and the second conductive element 202. When collecting currents of the same polarity, the conductive element of the same polarity will be electrically connected to the solar cell connecting strip 10, while the conductive elements of different polarities will be insulated from the solar cell connecting strip 10 to avoid short circuits.
[0026] To achieve electrical connection and isolation, and to ensure that the first conductive element 201 and the second conductive element 202 can be placed at the same height, the composite layer 2 includes a conductive portion 21 and an insulating portion 22. One side of the conductive portion 21 can be electrically connected to the conductive layer 1, and the other side of the conductive portion 21 can be electrically connected to either the first conductive element 201 or the second conductive element 202. Thus, the first conductive element 201 or the second conductive element 202 of the same polarity can overlap the conductive portion 21 to achieve electrical connection, while the first conductive element 201 or the second conductive element 202 of different polarities can overlap the insulating portion 22 to achieve insulation isolation. When the conductive portion 21 is electrically connected to the first conductive element 201, the second conductive element 202 is disposed on the insulating portion 22; when the conductive portion 21 is electrically connected to the second conductive element 202, the first conductive element 201 is disposed on the insulating portion 22. The insulating part 22 and the conductive part 21 cannot conduct electricity, so that conductive parts of different polarities can be arranged in parallel and spaced apart on the solar cell connecting strip 10 to achieve spaced electrical connection and insulation isolation.
[0027] The beneficial effects of this utility model embodiment are as follows:
[0028] In this embodiment of the utility model, the solar cell connecting strip 10 is disposed on the back side of the solar cell 30 and is used to collect the current of the connecting conductive element 20. It is provided with a conductive layer 1 and a combined layer 2. The conductive layer 1 is disposed on the back side of the solar cell 30 and is used to transmit current. The combined layer 2 includes a conductive part 21 and an insulating part 22. One side of the conductive part 21 can be electrically connected to the conductive layer 1, and the other side of the conductive part 21 can be electrically connected to the first conductive element 201 or the second conductive element 202 of the connecting conductive element 20. Since the combined layer 2 is located on the side of the conductive layer 1 away from the solar cell 30, the first conductive element 201 and the second conductive element 202 can be connected to the upper part of the solar cell connecting strip 10. The solar cell connecting strip 10 does not need to have clearance holes, but is connected to the connecting conductive elements 20 of different polarities through the conductive part 21. The connecting conductive elements 20 of different polarities are insulated by the insulating part 22. Therefore, there is no need to align the clearance holes during welding. The first conductive element 201 and the second conductive element 202 can be directly laid on the solar cell connecting strip 10. Welding is simple and precise, and there is no risk of poor welding. On the other hand, the solar cell connecting strip 10 has a regular shape and is not prone to thermal stress during welding, thus reducing the risk of warping and microcracks in the solar cell 30.
[0029] See Figure 3An insulating member 3 is provided between the conductive layer 1 and the back of the solar cell 30 to provide overall insulation and isolation between the solar cell connecting strip 10 and the back of the solar cell 30. This ensures that the current on the first conductive member 201 and the second conductive member 202 is concentrated only in the solar cell connecting strip 10. The combined layer 2 is located on the side of the conductive layer 1 away from the insulating member 3 to facilitate overlap with the first conductive member 201 or the second conductive member 202. The width of the insulating member 3 is not less than the width of the conductive layer 1 to ensure isolation of the solar cell connecting strip 10. When the first conductive member 201 or the second conductive member 202 overlaps the conductive layer 1, the side of the connection between the first conductive member 201 or the second conductive member 202 and the conductive part 21 can abut against the insulating member 3. In this way, the conductive member connected to the solar cell connecting strip 10 can maintain a certain distance from the back of the solar cell 30, thereby achieving a better current collection effect.
[0030] The conductive portion 21 and the insulating portion 22 are spaced apart from each other, with equal spacing between them. These spacings correspond to the positions of the spaced-apart first conductive element 201 and second conductive element 202, respectively. The arrangement direction of the conductive portion 21 and the insulating portion 22 is perpendicular to the length direction of the first conductive element 201 and the second conductive element 202. Parts of the first conductive element 201 and the second conductive element 202 are in contact with either the conductive portion 21 or the insulating portion 22. Specifically, when the first conductive element 201 abuts against the conductive portion 21, the second conductive element 202 abuts against the insulating portion 22; conversely, when the second conductive element 202 abuts against the conductive portion 21, the first conductive element 201 abuts against the insulating portion 22. Specifically, when the first conductive member 201 abuts against the side of the conductive portion 21 away from the battery cell 30, the second conductive member 202 abuts against the side of the insulating portion 22 away from the battery cell 30; when the second conductive member 202 abuts against the side of the conductive portion 21 away from the battery cell 30, the first conductive member 201 abuts against the side of the insulating portion 22 away from the battery cell 30.
[0031] Additionally, see Figure 1Multiple solder joints 40 are provided between the connecting conductive component 20 and the battery cell 30. The first conductive component 201 and the second conductive component 202 are connected to the battery cell 30 through the solder joints 40, which are both mechanically and electrically connected to the battery cell 30. The solder joints 40 can serve as electrical loop nodes for the first conductive component 201 and the second conductive component 202. The generated current can be collected by the solder joints 40. Traditional modules place the busbar and insulating component 3 at the edge of the solar cell 30 or at the interval between adjacent solar cells 30. This not only occupies more space in the module but also causes warping after welding due to insufficient fixing points and low support strength. In this embodiment, the solar cell connecting strip 10 is placed on the back of the solar cell 30, and the conductive layer 1 is staggered from the solder joint 40, specifically between two adjacent solder joints 40. This not only saves the space occupied by the solar cell connecting strip 10 but also provides strong connection strength because it is fixed to the back of the solar cell 30, making it less prone to warping after welding. Furthermore, since both the conductive layer 1 and the combined layer 2 have a certain height, staggering the position of the solar cell connecting strip 10 from the solder joint 40 can prevent the solder joint 40 from being poorly welded due to the height of the conductive layer 1 and the combined layer 2 during welding.
[0032] Among them, see Figure 4 The conductive layer 1 includes a conductive substrate layer 11 and an outer coating layer 12. The conductive substrate layer 11 can be made of metals or alloys such as copper and aluminum, and plays the role of collecting and transmitting the current generated by the battery cell 30. The outer coating layer 12 mainly plays the role of protecting the conductive substrate layer 11, improving corrosion resistance, increasing mechanical strength and improving surface properties. It can improve conductivity, enhance corrosion resistance, and increase weldability, and can be made of pure tin or tin alloys.
[0033] Furthermore, during production, the insulating component 3 is first placed on the back of the battery cell 30, and then the solar cell connecting strip 10 is placed on the insulating component 3. On this basis, the first conductive component 201 and the second conductive component 202 are respectively laid on the conductive part 21 and the insulating part 22. In order to improve the efficiency of continuous production and reduce the difficulty of laying the first conductive component 201 and the second conductive component 202, the conductive part 21 and the insulating part 22 are different colors. In this way, after the first conductive component 201 and the second conductive component 202 are laid on the positions of different colors, they can overlap with the corresponding conductive part 21 and insulating part 22, which is convenient and simple and does not require precise alignment.
[0034] Additionally, see Figure 1This utility model also discloses a solar cell module, including a solar cell connecting strip 10 as described above, a plurality of solar cells 30 and a connecting conductive member 20. Adjacent solar cells 30 are electrically connected through the connecting conductive member 20. The connecting conductive member 20 collects and conducts the current generated by the solar cells 30. The connecting conductive member 20 is arranged along a first direction. The solar cell connecting strip 10 is located on the back side of the solar cells 30 and is electrically connected to the connecting conductive member 20. The connecting conductive member 20 is connected to the side of the solar cell connecting strip 10 away from the solar cells 30. The solar cell connecting strip 10 can further collect the current collected by the connecting conductive member 20.
[0035] The solar cell connecting strip 10 includes a conductive layer 1 and a combined layer 2. An insulating member 3 is provided between the conductive layer 1 and the back of the solar cell 30 to prevent short circuits. The combined layer 2 includes a conductive part 21 and an insulating part 22. The conductive part 21 and the insulating part 22 are spaced apart from each other. One side of the conductive part 21 can be electrically connected to the conductive layer 1. The conductive part 21 can conduct current into the conductive layer 1. The conductive part 21 and the insulating part 22 are arranged along a second direction. The insulating part 22 insulates and isolates adjacent conductive parts 21, so that the connecting conductive member 20 overlapping the insulating part 22 does not make electrical contact with the adjacent connecting conductive member 20 overlapping the conductive part 21. The second direction is intersected with the first direction, so that a part of the connecting conductive member 20 can overlap the solar cell connecting strip 10, specifically abutting against the conductive part 21. Specifically, the connecting conductive element 20 includes a first conductive element 201 and a second conductive element 202. When the conductive part 21 is electrically connected to the first conductive element 201, the second conductive element 202 is disposed on the insulating part 22; when the conductive part 21 is electrically connected to the second conductive element 202, the first conductive element 201 is disposed on the insulating part 22.
[0036] The solar cell connecting strip 10 of this utility model has a conductive layer 1 and a combination layer 2. The combination layer 2 includes a conductive part 21 and an insulating part 22. During production, since the combination layer 2 is located on the side of the conductive layer 1 away from the solar cell 30, the first conductive element 201 and the second conductive element 202 can be connected to the upper part of the solar cell connecting strip 10 and overlap with the conductive part 21 and the insulating part 22 respectively, forming an electrical connection and insulation isolation. The solar cell connecting strip 10 does not need to open clearance holes. Instead, the conductive part 21 is connected to the connecting conductive elements 20 of different polarities. The connecting conductive elements 20 of different polarities are insulated by the insulating part 22. Therefore, during welding, there is no need to align the clearance holes. The first conductive element 201 and the second conductive element 202 can be directly laid on the solar cell connecting strip 10. Welding is simple and precise, and there is no risk of poor welding. On the other hand, the solar cell connecting strip 10 has a regular shape and is not prone to thermal stress during welding, thus reducing the risk of warping and microcracks in the solar cell 30.
[0037] The above are preferred embodiments of the present utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications are also considered to be within the protection scope of the present utility model.
Claims
1. A solar cell connecting strip for collecting current from multiple connected conductive components, characterized in that, It includes a conductive layer and a composite layer. The conductive layer is disposed on the back side of the battery cell, and the composite layer is disposed on the side of the conductive layer away from the battery cell. The connecting conductive element includes a first conductive element and a second conductive element, and the first conductive element or the second conductive element can be electrically connected to a portion of the composite layer. The composite layer includes a conductive portion and an insulating portion. One side of the conductive portion can be electrically connected to the conductive layer, and the other side of the conductive portion can be electrically connected to the first conductive element or the second conductive element. When the conductive part is electrically connected to the first conductive element, the second conductive element is disposed on the insulating part; when the conductive part is electrically connected to the second conductive element, the first conductive element is disposed on the insulating part.
2. The solar cell connecting strip according to claim 1, characterized in that, An insulating element is provided between the conductive layer and the back of the battery cell, and the composite layer is located on the side of the conductive layer away from the insulating element.
3. The solar cell connecting strip according to claim 2, characterized in that, The width of the insulating member is not less than the width of the conductive layer, and the side of the connection between the first conductive member or the second conductive member and the conductive part can abut against the insulating member.
4. The solar cell connecting strip according to claim 1, characterized in that, The conductive parts and the insulating parts are spaced apart from each other, and the arrangement direction of the conductive parts and the insulating parts is perpendicular to the length direction of the first conductive element and the second conductive element.
5. The solar cell connecting strip according to claim 1, characterized in that, Multiple solder joints are provided between the connecting conductive component and the battery cell. The first conductive component and the second conductive component are electrically connected to the battery cell through the solder joints. The conductive layer is disposed between two adjacent solder joints.
6. The solar cell connecting strip according to claim 1, characterized in that, When the first conductive element abuts against the side of the conductive portion away from the battery cell, the second conductive element abuts against the side of the insulating portion away from the battery cell; When the second conductive element abuts against the side of the conductive portion away from the battery cell, the first conductive element abuts against the side of the insulating portion away from the battery cell.
7. The solar cell connecting strip according to claim 1, characterized in that, The conductive layer includes a conductive substrate layer and an outer coating layer.
8. The solar cell connecting strip according to claim 1, characterized in that, The conductive part and the insulating part are different colors.
9. A solar cell module, characterized in that, The device includes a solar cell connecting strip as described in any one of claims 1-8, and further includes a plurality of solar cells and a connecting conductive element, wherein adjacent solar cells are electrically connected through the connecting conductive element, the connecting conductive element is arranged along a first direction, the solar cell connecting strip is disposed on the back side of the solar cells and electrically connected to the connecting conductive element, and the connecting conductive element is connected to the side of the solar cell connecting strip away from the solar cells.
10. The solar cell module according to claim 9, characterized in that, The solar cell connecting strip includes a conductive layer and a composite layer. An insulating element is provided between the conductive layer and the back of the solar cell. The composite layer includes a conductive portion and an insulating portion, which are spaced apart from each other. One side of the conductive portion can be electrically connected to the conductive layer. The conductive portion and the insulating portion are arranged along a second direction, which intersects with the first direction. The connecting conductive element includes a first conductive element and a second conductive element. When the conductive portion is electrically connected to the first conductive element, the second conductive element is disposed on the insulating portion. When the conductive portion is electrically connected to the second conductive element, the first conductive element is disposed on the insulating portion.