Electrode structure of back contact battery, back contact battery and back contact battery assembly
By designing the arrangement of segmented fine grids and flux in the back contact battery, the problem of unstable connection between the solder tape and the pad point is solved, the connection strength and current transmission efficiency are improved, and the production cost is reduced.
Patent Information
- Application Number
- CN202422313275.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-09-20
AI Technical Summary
In the prior art, due to the different slurry compositions of the fine grid slurry and pad points, the tension between the pad points and the welding tape is lower, which easily leads to desoldering of the welding tape and the connection reliability between the welding tape and the battery cell is reduced.
Using the electrode structure of the back contact battery, the fine gate is designed as the first segmented fine gate and the second segmented fine gate, the interval is set on the pad point, and flux is provided on the pad point to ensure the stable connection between the solder tape and the solder paste and reduce the direct contact area.
The connection strength between the welding tape and the pad point is improved, the welding tape is avoided, the current convergence efficiency is ensured, precious metal consumption is reduced, and production costs are reduced.
Smart Images
Figure CN223297982U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of photovoltaic technology, and in particular relates to an electrode structure of a back-contact cell, a back-contact cell, and a back-contact cell assembly. Background Art
[0002] In the related art, individual solar cells need to be connected to form a solar cell module. Soldering is the most important process. The quality of welding directly affects the production cost of the module, and the welding effect is directly related to the quality of the module. When soldering the solder ribbon, solder paste is usually applied to the pad point to solder the solder ribbon. In the existing technology, there will be a fine grid passing through the pad point. Due to the different slurry compositions of the fine grid and the pad point, the fine grid on the pad point will affect the tension between the pad point and the solder ribbon, which can easily cause the solder ribbon to desolder, thereby reducing the connection reliability between the solder ribbon and the solar cell. Utility Model Content
[0003] The present application provides a solar cell, which aims to solve the problem in the prior art that fine grids pass through pad points. Due to the different slurry compositions of the fine grid slurry and the pad point slurry, the fine grids on the pad point will affect the tension between the pad point and the soldering ribbon, which in turn may easily cause the soldering ribbon to become detached, thereby reducing the connection reliability between the soldering ribbon and the solar cell.
[0004] The present application is implemented as follows: an electrode structure of a back-contact battery includes at least one pad point and at least one fine grid extending through the pad point along a first direction, the fine grid and the pad point have the same polarity, the fine grid includes at least a first segmented fine grid and a second segmented fine grid, one end of the pad point is electrically contacted with the first segmented fine grid, and the other end of the pad point is electrically contacted with the second segmented fine grid, and the first segmented fine grid and the second segmented fine grid are spaced apart in the first direction.
[0005] Optionally, the pad point has a first size in a first direction, and a ratio of a spacing distance between the first segmented fine gate and the second segmented fine gate to the first size is greater than 1 / 2.
[0006] Optionally, a spacing distance between the first segmented fine grid and the second segmented fine grid is equal to the first size.
[0007] Optionally, it further includes a soldering flux disposed on the pad point, wherein the soldering flux fills the spacing area between the first segmented fine grid and the second segmented fine grid.
[0008] Optionally, the area of the pad point is 40-60mm 2 .
[0009] Optionally, the width of the fine grid is 0.12 mm to 0.17 mm.
[0010] Optionally, the first segmented fine gate and the second segmented fine gate are collinearly arranged.
[0011] Optionally, each of the first segmented fine grid and the second segmented fine grid passes through a center point of the pad point.
[0012] Optionally, the first segmented fine gate and the second segmented fine gate are not arranged collinearly.
[0013] Optionally, there are a plurality of pad points, and the first segmented fine grids and the second segmented fine grids are alternately arranged between the plurality of pad points.
[0014] In the present application, the fine grid connected to the pad point is set as the first segmented fine grid and the second segmented fine grid, and the first segmented fine grid and the second segmented fine grid are set at intervals. In this way, on the one hand, electrical conduction between the first segmented fine grid, the pad point and the second segmented fine grid can be achieved, which facilitates the convergence of carriers at the fine grid into the main grid. On the other hand, since the first segmented fine grid and the second segmented fine grid adopt a spaced layout design strategy at the pad point position, this layout significantly reduces the direct contact area between the solder paste and the fine grid. When the solder paste is precisely placed on these pad points, it not only ensures that the solder ribbon is firmly and reliably connected through the solder paste, but also avoids the problem of low tension between the solder ribbon and the pad point caused by the fine grid passing through the pad point.
[0015] A back-contact battery comprises the above-mentioned electrode structure.
[0016] A back-contact battery assembly comprises the above-mentioned back-contact battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the electrode structure of the back contact battery provided in the present application. Figure 1 ;
[0018] Figure 2 This is a schematic diagram of the electrode structure of the back contact battery provided in the present application. Figure 2 ;
[0019] Figure 3 This is a schematic diagram of the electrode structure of the back contact battery provided in the present application. Figure 3 ;
[0020] Figure 4 This is a structural schematic diagram of two pad points in the electrode structure of the back contact battery provided in the current application.
[0021] Description of reference numerals:
[0022] 100, pad point; 200, fine grid; 201, first segmented fine grid; 202, second segmented fine grid. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. In addition, it should be understood that the specific embodiments described herein are merely used to explain the present application and are not intended to limit the present application.
[0024] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "left", "right", "horizontal", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.
[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.
[0026] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.
[0027] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0028] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.
[0029] like Figure 1 As shown, an electrode structure of a back-contact battery includes at least one pad point 100 and at least one fine grid 200 extending through the pad point 100 along a first direction, the fine grid 200 and the pad point 100 have the same polarity, the fine grid 200 includes at least a first segmented fine grid 201 and a second segmented fine grid 200, one end of the pad point 100 is electrically contacted with the first segmented fine grid 201, and the other end of the pad point 100 is electrically contacted with the second segmented fine grid 202, and the first segmented fine grid 201 and the second segmented fine grid 202 are spaced apart in the first direction.
[0030] In the embodiment of the present application, the pad point 100 and the fine grid 200 are both arranged on the surface of the battery cell, wherein the main grid and the pad point 100 are printed using the same paste, and the main grid and the pad point 100 have a high connection strength with the battery cell. The fine grid 200 is printed using a burn-through paste, and the fine grid 200 has a weak connection strength with the battery cell. In traditional electrode patterns, the fine grid 200 connected to the pad point 100 is usually printed directly through the pad, which divides the pad point 100 into two parts, destroying the integrity of the solder paste set at the pad point 100, and reducing the connection strength between the solder ribbon and the pad point 100. In addition, since the paste composition of the fine grid 200 and the pad point 100 is different, the bonding ability of the solder paste and the fine grid 200 is weak, and the fine grid 200 has a certain width, which further reduces the connection strength between the solder ribbon and the pad point 100. In addition, generally speaking, the connection strength between the fine grid 200 and the main grid, the fine grid 200 and the solar cell is relatively weak. If the soldering ribbon is detached, the entire fine grid 200 is likely to be pulled off the track.
[0031] In the present application, the fine grid 200 connected to the pad point 100 is set as the first segmented fine grid 201 and the second segmented fine grid 200, and the first segmented fine grid 201 and the second segmented fine grid 202 are set at intervals. In this way, on the one hand, the electrical conduction between the first segmented fine grid 201, the pad point 100 and the second segmented fine grid 202 can be achieved, which facilitates the convergence of the carriers at the fine grid 200 into the main grid. On the other hand, since the first segmented fine grid 201 and the second segmented fine grid 202 adopt a spaced layout design strategy at the pad point 100 position, this layout significantly reduces the direct contact area between the solder paste and the fine grid 200. When the solder paste is precisely placed on these pad points 100, it not only ensures that the solder ribbon is firmly and reliably connected through the solder paste, but also avoids the problem of low tension between the solder ribbon and the pad point 100 caused by the fine grid 200 passing through the pad point 100.
[0032] This is because the first segmented fine grid 201 and the second segmented fine grid 202 are spaced apart at the pad point 100 , that is, the fine grid 200 is segmented, thus avoiding the situation where one welding ribbon is detached and the entire fine grid 200 is pulled off.
[0033] In the embodiment of the present application, the pad point 100 is set to one, the fine gate 200 is set to one line, and the fine gate 200 is segmented into a first segmented fine gate 201 and a second segmented fine gate 202 for exemplary description.
[0034] like Figure 4As shown, in other embodiments, there can be multiple pad points 100, and the first segmented fine gate and the second segmented fine gate are alternately arranged between the multiple pad points, and the first segmented fine gate and the second segmented fine gate are alternately arranged in the first direction. For example, if there are two pad points, the fine gate segments are arranged into the first segmented fine gate, the second segmented fine gate, and the third segmented fine gate. One end of the first segmented fine gate is connected to the first pad point, the other end of the first segmented fine gate is connected to the second pad point, the second segmented fine gate is connected to the other end of the first pad point, and the third segmented fine gate is connected to the other end of the second pad point. The same applies to the case where there are multiple pad points.
[0035] According to the electrode structure of the back-contact battery provided in this application, the fine gate 200 and the pad 100 have the same polarity. Specifically, the fine gate 200 and the pad 100 can have the same polarity as an n-type fine gate and an n-type pad, or they can have the same polarity as a p-type fine gate and a p-type pad. This is not a limitation for comparison in this application.
[0036] like Figure 1 As shown, in the embodiment of the present application, the pad point 100 has a first dimension in a first direction, and the ratio of the distance between the first segmented fine grid 201 and the second segmented fine grid 202 to the first dimension is greater than 1 / 2. Preferably, the ratio of the distance between the first segmented fine grid 201 and the second segmented fine grid 202 to the first dimension is greater than 2 / 3. In this way, on the one hand, the first segmented fine grid 201 and the second segmented fine grid 202 partially extend into the pad point 100, ensuring stable electrical contact between the first segmented fine grid 201 and the second segmented fine grid 202 and the pad. On the other hand, the first segmented fine grid 201 and the second segmented fine grid 202 leave sufficient area for solder paste, so that the solder paste on the pad point 100 is connected as a whole, ensuring a stable and reliable connection of the solder ribbon through the solder paste. In addition, the segmented arrangement of the fine grid 200 can reduce the consumption of precious metal materials such as silver paste, thereby reducing the manufacturing cost of photovoltaic cells.
[0037] like Figure 2 As shown, further, the spacing between the first segmented fine grid 201 and the second segmented fine grid 202 is equal to the first size. In other words, the first segmented fine grid 201 is connected to the edge of the pad 100, and the second segmented fine grid 202 is connected to the edge of the pad 100. The first segmented fine grid 201 and the second segmented fine grid 202 do not occupy any area within the pad 100, so that the solder paste completely fills the entire pad 100 area, and the effect of the fine grid 200 on the soldering tension between the solder ribbon and the pad 100 is minimized.
[0038] A back-contact battery electrode structure also includes a solder flux disposed on pad point 100. The solder flux fills the space between the first segmented fine grid 201 and the second segmented fine grid 202. This allows the solder flux to be integrated at pad point 100, and the solder ribbon is soldered to the pad point 100 with the help of the solder flux, resulting in a high connection strength. In the present embodiment, the solder flux is preferably solder paste. Of course, in other embodiments, the solder flux may also be other ingredients, and this application is not limited thereto.
[0039] In some embodiments, the area of the pad point 100 is 40-60 mm 2 That is, the positive projection area of the pad point 100 on the battery cell can be 40-60mm 2 .
[0040] In this way, setting the area of the pad point 100 within this reasonable range can avoid the area of the pad point 100 being too small, resulting in a low connection strength between the solder ribbon and the pad point 100, and can also avoid the area of the pad point 100 being too large, affecting the power generation efficiency of the battery cell.
[0041] Specifically, in such an embodiment, the area of the pad point 100 may be, for example, 40 mm 2 , 45mm 2 , 50mm2, 55mm 2 , 60mm 2 , or 40mm 2 -60mm 2 Any value between , not limited here.
[0042] Furthermore, the shape of the pad point 100 can be any one of a circle, a polygon, an ellipse, a ring, and an irregular shape. This application does not limit the comparison.
[0043] In some embodiments, the width of the fine grid 200 is 0.12 mm to 0.17 mm. Within this width range, the fine grid 200 ensures a good connection between the fine grid 200 and the cell, reducing the risk of failure due to poor connection. Furthermore, within this width range, the fine grid 200 lines can effectively collect the photocurrent within their coverage area and quickly transmit it to the busbars, reducing the current transmission path and losses within the cell.
[0044] Furthermore, the first segmented fine grid 201 and the second segmented fine grid 202 are collinearly arranged. The collinearly arranged first segmented fine grid 201 and second segmented fine grid 202 can form a more efficient current transmission network. This design reduces the current transmission path within the cell, reduces resistance loss, and thus improves current transmission efficiency. Preferably, each of the first segmented fine grid 201 and the second segmented fine grid 202 passes through the center point of the pad point 100. This allows for an optimized design of the distribution of the fine grids 200, and fine grids 200 of the same polarity can be evenly distributed in the area where the pad point 100 is located. In addition, the design of passing through the center of the pad point 100 makes the connection between the fine grid 200 and the pad point 100 more direct and efficient. When the current is transmitted from the fine grid 200 to the pad point 100, it does not need to pass through an additional path or turn, thereby reducing resistance loss and improving current transmission efficiency.
[0045] like Figure 3 As shown, in other embodiments, the first segmented fine gate 201 and the second segmented fine gate 202 are not arranged in a colinear manner. In such an arrangement structure, the first segmented fine gate 201 and the second segmented fine gate 202 can be arranged more flexibly and diversely, and have better design compatibility with different types of electrode patterns.
[0046] A solar cell includes the above-mentioned solar cell electrode structure. The technical effects of the solar cell are the same as those of the solar cell electrode structure, which will not be described in detail here.
[0047] A solar cell assembly includes the above-mentioned solar cell. Based on the above-mentioned solar cell, those skilled in the art know that a corresponding battery assembly can be obtained by combining multiple solar cells and / or other corresponding existing accessories.
[0048] In this embodiment, the multiple solar cells in the battery assembly can be connected in series in sequence to form a battery string, thereby realizing the series bus output of the current. For example, the series connection of the battery cells can be realized by providing welding strips (bus bars, interconnecting bars), conductive back plates, etc. It can be understood that in such an embodiment, the battery assembly may also include a metal frame, a back plate, photovoltaic glass and an adhesive film. The adhesive film can be filled between the front and back of the back contact battery and the photovoltaic glass, adjacent battery cells, etc. As a filler, it can be a transparent colloid with good light transmittance and aging resistance. For example, the adhesive film can be EVA film or POE film. The specific selection can be made according to the actual situation and is not limited here.
[0049] Throughout this specification, reference to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations 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 any one or more embodiments or examples.
[0050] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.
Claims
1. An electrode structure for a back contact battery, characterized in that: The invention comprises at least one pad point and at least one fine gate extending through the pad point along a first direction, wherein the fine gate and the pad point have the same polarity, and the fine gate comprises at least a first segmented fine gate and a second segmented fine gate, wherein one end of the pad point is electrically contacted with the first segmented fine gate, and the other end of the pad point is electrically contacted with the second segmented fine gate, and the first segmented fine gate and the second segmented fine gate are spaced apart in the first direction.
2. The electrode structure of the back contact battery according to claim 1, wherein: The pad point has a first size in a first direction, and a ratio of a spacing distance between the first segmented fine gate and the second segmented fine gate to the first size is greater than 1 / 2.
3. The electrode structure of the back contact battery according to claim 2, characterized in that: The spacing distance between the first segmented fine grid and the second segmented fine grid is equal to the first size.
4. The electrode structure of the back contact battery according to claim 1, wherein: It also includes a soldering flux disposed on the pad point, and the soldering flux fills the spacing area between the first segmented fine grid and the second segmented fine grid.
5. The electrode structure of the back contact battery according to claim 1, wherein: The area of the pad point is 40-60mm 2 .
6. The electrode structure of the back contact battery according to claim 1, wherein: The width of the fine grid is 0.12 mm to 0.17 mm.
7. The electrode structure of the back contact battery according to claim 1, wherein: The first segmented fine gate and the second segmented fine gate are collinearly arranged.
8. The electrode structure of the back contact battery according to claim 7, characterized in that: Each of the first segmented fine gate and the second segmented fine gate passes through a center point of the pad point.
9. The electrode structure of the back contact battery according to claim 1, wherein: The first segmented fine gate and the second segmented fine gate are not arranged collinearly.
10. The electrode structure of the back contact battery according to claim 1, wherein: There are multiple pad points, and the first segmented fine grids and the second segmented fine grids are alternately arranged between the multiple pad points.
11. A back contact battery, characterized in that: The back contact cell comprises the electrode structure according to any one of claims 1 to 10.
12. A back contact battery assembly, characterized in that: The back-contact cell assembly comprises the back-contact cell of claim 11 .