Battery piece welding structure, photovoltaic module and photovoltaic system
By setting spaced conductive elements on the back electrode of the solar cell and welding them with the prefabricated welding strip, the problem of misalignment during welding was solved, the welding stability and reliability were improved, and the current collection efficiency and overall quality of the photovoltaic module were enhanced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-03-24
AI Technical Summary
In existing technologies, the welding strip preforms are prone to misalignment during the welding process with the solar cells, which affects welding efficiency and the product quality of photovoltaic modules.
The battery cell welding structure is adopted. By setting at least two spaced conductive parts on the back electrode of the battery cell and welding them to the welding strip preform, the contact area and connection points are increased, stress is dispersed, welding stability and reliability are improved, and the conductive parts are used to position the welding strip preform, reducing the risk of displacement.
It improves the stability and reliability of welding, reduces mechanical damage, enhances current collection efficiency, reduces resistance loss, and improves the overall efficiency and quality of photovoltaic modules.
Smart Images
Figure CN224037739U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of photovoltaic technology, and particularly relates to a cell piece welding structure, a photovoltaic module and a photovoltaic system. BACKGROUND
[0002] The photovoltaic module comprises a front plate, a front adhesive film, a plurality of cell pieces, a welding strip preform, a back adhesive film and a back plate arranged in a stack. However, the welding strip preform and the cell piece often deviate in the welding process at present, which affects the welding efficiency and the product quality of the photovoltaic module. CONTENT OF THE UTILITY MODEL
[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a cell piece welding structure, a photovoltaic module and a photovoltaic system, which improve the welding reliability and stability between the cell piece and the welding strip preform.
[0004] In a first aspect, the present application provides a cell piece welding structure for connecting with a welding strip preform, the cell piece welding structure comprising:
[0005] a cell piece, the cell piece being provided with a plurality of back electrodes;
[0006] a plurality of conductive pieces, at least two of the conductive pieces being spaced apart and arranged on a side of the back electrode away from the cell piece, the conductive pieces being used for welding connection with the welding strip preform.
[0007] According to the cell piece welding structure of the present application, the welding strip preform and each back electrode are connected through at least two conductive pieces, which not only increases the contact area and the connection points between the welding strip preform and the cell piece, thereby improving the stability and reliability of welding, but also disperses the stress generated in the welding process, reduces the mechanical damage to the cell piece, is particularly suitable for thin cell pieces, can more evenly collect the current generated by the cell piece, reduces the resistance loss in the current transmission path, and thereby improves the overall efficiency of the photovoltaic module. At the same time, the at least two conductive pieces are spaced apart on the back electrode, so that the welding strip preform can be better positioned and fixed in the welding process, and the gap between the conductive pieces can be filled with the molten solder on the welding strip preform in the welding process, which effectively reduces the possibility of deviation of the welding strip preform in the welding process and improves the welding quality.
[0008] According to an embodiment of the present application, the length of the conductive piece extends along a first horizontal direction, and the at least two conductive pieces are spaced apart on the back electrode along a second horizontal direction, and the first horizontal direction and the second horizontal direction intersect.
[0009] According to an embodiment of the present application, the edge of each conductive piece is spaced apart from the edge of the corresponding back electrode.
[0010] According to an embodiment of the present application, the length of the back electrode extends along a first horizontal direction, the width of the back electrode is d1, the width of the conductive piece is d2, and the width of the solder strip preform is d3, d1>d3>d2; and / or
[0011] In the second horizontal direction, the edge of the conductive piece at the end and the edge of the solder strip preform are aligned.
[0012] According to an embodiment of the present application, the cross section of the conductive piece comprises at least one of a square and an ellipse.
[0013] According to an embodiment of the present application, the conductive piece is formed on the back electrode by a screen printing process.
[0014] According to an embodiment of the present application, the solar cell has a positive electrode region and a negative electrode region, a part of the plurality of back electrodes are arranged in the positive electrode region, and another part of the plurality of back electrodes are arranged in the negative electrode region.
[0015] According to an embodiment of the present application, the positive electrode region and the negative electrode region are located on the same side of the solar cell.
[0016] In a second aspect, the present application provides a photovoltaic module, comprising:
[0017] A cell string layer is prepared by welding a plurality of solder strip preforms and a plurality of solar cell welding structures as described above.
[0018] According to the photovoltaic module of the present application, the welding reliability and stability between the solar cell and the solder strip preform are improved, and the quality and photoelectric conversion efficiency of the photovoltaic module are improved.
[0019] In a third aspect, the present application provides a photovoltaic system, comprising the photovoltaic module as described above.
[0020] According to the photovoltaic system of the present application, the welding reliability and stability between the solar cell and the solder strip preform are improved, and the energy storage efficiency of the photovoltaic system is improved.
[0021] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS
[0022] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:
[0023] Figure 1is a structural schematic diagram of a battery piece welding structure provided by an embodiment of the present application;
[0024] Figure 2 is a structural schematic diagram of a battery piece welding structure and a structure before welding provided by an embodiment of the present application;
[0025] Figure 3 is Figure 2 is a local enlarged view of A in FIG. 8;
[0026] Figure 4 is a structural schematic diagram of a battery piece welding structure and a structure before welding provided by an embodiment of the present application;
[0027] Figure 5 is a local schematic diagram of a battery string layer provided by an embodiment of the present application.
[0028] Reference signs:
[0029] 100, battery piece; 101, positive electrode area; 102, negative electrode area;
[0030] 200, back electrode;
[0031] 300, conductive piece;
[0032] 400, ohmic contact part; 500, welding ribbon;
[0033] 900, welding ribbon preform. DETAILED DESCRIPTION
[0034] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.
[0035] The following description refers to the accompanying drawings. Figures 1-4 The battery piece welding structure provided by the embodiments of the present application is described below, which is used to be connected with the welding ribbon preform 900, and the battery piece welding structure comprises a battery piece 100 and a plurality of conductive pieces 300.
[0036] The battery piece 100 is provided with a plurality of back electrodes 200. The shapes of the battery piece 100 and the back electrodes 200 each include but are not limited to a rectangle. It should be noted that the size of the battery piece 100 and the number of the back electrodes 200 can be designed according to actual needs, and the embodiments of the present application do not make specific limitations thereon.
[0037] The back electrode 200 is provided with at least two spaced conductive pieces 300 on the side away from the cell sheet 100, and the conductive pieces 300 are used for welding connection with the solder strip preform 900. The conductive pieces 300 include but are not limited to tin paste or conductive glue. It should be noted that the number and specific distribution of the conductive pieces 300 can also be designed according to actual needs, and the present embodiment does not make specific limitations thereto.
[0038] It can be understood that the solder strip preform 900 and each back electrode 200 are connected through at least two conductive pieces 300, which not only can increase the contact area and connection points between the solder strip preform 900 and the cell sheet 100, thereby improving the stability and reliability of welding, and dispersing the stress generated during welding, reducing the mechanical damage to the cell sheet 100, especially suitable for the thin sheet of the cell sheet 100, but also can more evenly collect the current generated by the cell sheet 100, reduce the resistance loss in the current transmission path, thereby improving the overall efficiency of the photovoltaic module. At the same time, the at least two conductive pieces 300 are spaced apart on the back electrode 200, so that the solder strip preform 900 can be better positioned and fixed during welding, and it is also convenient for the solder on the solder strip preform 900 to fill the gap between the conductive pieces 300 after melting during welding, effectively reducing the possibility of the solder strip preform 900 deviating during welding, and improving the welding quality.
[0039] According to the cell sheet welding structure provided by the embodiment of the present application, the welding reliability and stability between the cell sheet 100 and the solder strip preform 900 are improved.
[0040] In some embodiments, as shown in Figures 1-4 The length of the conductive piece 300 extends along a first horizontal direction, and the at least two conductive pieces 300 are spaced apart in a second horizontal direction on the back electrode 200, and the first horizontal direction and the second horizontal direction intersect.
[0041] For the convenience of understanding, the first horizontal direction is parallel to the length direction of the cell sheet 100, and the second horizontal direction is parallel to the width direction of the cell sheet 100.
[0042] It can be understood that on each back electrode 200, the conductive piece 300 extends along the first horizontal direction and is spaced apart in the second horizontal direction, and the stress generated during welding can not only be dispersed in the first horizontal direction by the conductive piece 300, but also be further dispersed in the second horizontal direction to achieve multi-directional stress dispersion. In addition, in combination with the fact that the solder strip preform 900 extends along the first horizontal direction, it can be better positioned during welding, and the possibility of deviation of the solder strip preform 900 (i.e. inclined in the direction close to the cell sheet 100 along the width direction) is reduced.
[0043] In some embodiments, as shown in Figure 3 and Figure 4As shown, the edge of each conductive member 300 is spaced apart from the edge of the corresponding back electrode 200. It should be noted that the size of each of the back electrode 200 and the conductive member 300 can be designed according to actual needs, and the present embodiment does not make specific limitations thereto.
[0044] It can be understood that, in the direction close to the battery piece 100, the outer edge of the projection of each conductive member 300 is located within the outer edge of the corresponding back electrode 200, which reduces the possibility of the conductive member 300 being deformed to contact the surface of the battery piece 100 close to the back electrode 200 due to the generation of heat during welding, thereby reducing the risk of short circuit.
[0045] In some embodiments, as shown in Figure 3 The length of the back electrode 200 extends along the first horizontal direction, the width of the back electrode 200 is d1, the width of the conductive member 300 is d2, and the width of the solder strip preform 900 is d3, d1>d3>d2.
[0046] It can be understood that the distance between the two ends of the solder strip preform 900 arranged along the second horizontal direction is not greater than the distance between the two ends of the back electrode 200 arranged along the second horizontal direction, which can effectively avoid the possibility of the solder strip preform 900 contacting the surface of the battery piece 100 close to the back electrode 200, thereby reducing the risk of short circuit caused by welding deformation or position deviation. The distance between the two ends of the conductive member 300 arranged along the second horizontal direction is less than the distance between the two ends of the solder strip preform 900 arranged along the second horizontal direction, so that the conductive member 300 plays a buffering role during welding, disperses the thermal stress and mechanical stress generated during welding, and reduces the damage to the battery piece 100.
[0047] In some embodiments, as shown in Figure 3 and Figure 4 Along the second horizontal direction, the edge of the conductive member 300 located at the end of each back electrode 200 is aligned with the edge of the solder strip preform 900.
[0048] It can be understood that the edge of the back electrode 200 located at the end along the second horizontal direction on each back electrode 200 is correspondingly aligned with the edge of the solder strip preform 900 along the second horizontal direction, which can ensure that the contact between the solder strip preform 900 and the conductive member 300 is more accurate, reduce the problem of poor contact or virtual welding caused by position deviation during welding, and also reduce the possibility of the solder strip preform 900 as a whole tilting along the second horizontal direction towards the direction close to the battery piece 100 during welding, thereby improving the welding quality.
[0049] In some embodiments, as shown in Figure 3 and Figure 4As shown, each back electrode 200 is provided with two conductive members 300 distributed along the second horizontal direction. Of course, in other embodiments, a plurality of arrayed conductive members 300 can also be provided on each back electrode 200, which is not specifically limited in the present embodiment.
[0050] In some embodiments, as shown in Figure 3 and Figure 4 The cross section of the conductive member 300 includes at least one of a square and an ellipse.
[0051] It can be understood that when the cross section of the conductive member 300 is square, it can adapt to the scene of high-precision alignment and stable welding, reduce the risk of welding deviation, and improve the stability and reliability of welding. When the cross section of the conductive member 300 is elliptical, it can also reduce stress concentration during welding and improve welding efficiency.
[0052] In some embodiments, as shown in Figures 1-4 The conductive member 300 is formed on the back electrode 200 by a screen printing process.
[0053] It can be understood that the conductive member 300 is printed on the back electrode 200 and then dried and cured, which is low in manufacturing cost and high in production efficiency. For example, conductive paste of silver paste, silver-coated copper paste, tin paste, tin-coated copper paste, or tin-lead-bismuth paste can be used to form the conductive member 300 on the back electrode 200 by a screen printing process.
[0054] In some embodiments, as shown in Figure 1 and Figure 2 The battery piece 100 has a positive electrode region 101 and a negative electrode region 102, and a part of the plurality of back electrodes 200 are arrayed in the positive electrode region 101, and another part of the plurality of back electrodes 200 are arrayed in the negative electrode region 102.
[0055] It can be understood that a part of the plurality of back electrodes 200 are arrayed in the positive electrode region 101 along the first horizontal direction and the second horizontal direction, and another part are arrayed in the negative electrode region 102 along the first horizontal direction and the second horizontal direction. By using the partition design, short circuit between the positive and negative electrodes of the battery piece 100 can be effectively avoided, while the space of the battery piece 100 is maximized, the current collection efficiency is improved, and the overall performance and long-term reliability of the battery piece 100 are enhanced.
[0056] In some embodiments, as shown in Figure 1 and Figure 2 The positive electrode region 101 and the negative electrode region 102 are located on the same side of the battery piece 100, so as to form a back contact assembly in subsequent processing, so that the side of the battery piece 100 away from the back electrode 200 can completely and unobstructed perform photoelectric conversion, improve the photoelectric conversion efficiency, and optimize the current collection path, reduce the welding stress and the risk of short circuit.
[0057] In some embodiments, as shown in Figure 1 and Figure 2 The positive electrode region 101 and the negative electrode region 102 are arranged along a first horizontal direction.
[0058] It can be understood that after the plurality of battery pieces 100 are sequentially arranged along the first horizontal direction, a plurality of solder strip preforms 900 between two adjacent battery pieces 100 are sequentially distributed along a second horizontal direction, a part of the solder strip preforms 900 is welded to the back electrode 200 at the positive electrode region 101 on one battery piece 100 through the conductive piece 300, another part of the solder strip preforms 900 is welded to the back electrode 200 at the negative electrode region 102 on the adjacent battery piece 100 through the conductive piece 300, and the other part of the solder strip preforms 900 is welded to the back electrode 200 at the positive electrode region 101 and the back electrode 200 at the negative electrode region 102 on one battery piece 100 through the conductive piece 300.
[0059] The application further provides a photovoltaic module.
[0060] As shown in Figure 5 The photovoltaic module comprises a battery string layer, which is welded by the plurality of solder strip preforms 900 and the above-mentioned battery piece welding structure.
[0061] It can be understood that, as shown in Figure 4 and Figure 5 During the welding process of the battery piece welding structure and the solder strip preform 900, all the conductive pieces 300 on the back electrode 200 and the solder strip preform 900 are molten and deformed due to the welding heat, and after waiting for cooling and solidification, a battery string layer is formed. The battery string layer comprises the solder strip 500, the ohmic contact part 400, the back electrode 200 and the battery piece 100 arranged in a stack, that is, a part of the solder strip preform 900 and all the conductive pieces 300 on the corresponding back electrode 200 jointly form the ohmic contact part 400, and another part of the solder strip preform 900 forms the solder strip 500. It should be noted that the number and specific distribution of the solder strip preform 900 can be designed according to actual needs, and the present application does not make specific limitation on this.
[0062] According to the photovoltaic module provided by the application, the welding reliability and stability between the battery piece 100 and the solder strip preform 900 are improved, and the quality and photoelectric conversion efficiency of the photovoltaic module are improved.
[0063] In some embodiments, the photovoltaic module further comprises a front plate, a back plate and two encapsulation films, the cell string layer is located between the front plate and the back plate; the encapsulation films are located between the front plate and the back plate and cover the surface of the cell string layer. That is, the front plate, one encapsulation film, the cell string layer, another encapsulation film and the back plate are laminated to finally complete the encapsulation of the entire photovoltaic module.
[0064] The embodiment of the present application further provides a photovoltaic system. The photovoltaic system comprises the photovoltaic module.
[0065] According to the photovoltaic system provided by the embodiment of the present application, the welding reliability and stability between the cell sheet 100 and the solder strip preform 900 are improved, and the energy storage efficiency of the photovoltaic system is improved.
[0066] In some embodiments, the photovoltaic system further comprises a photovoltaic support, and the photovoltaic module is installed on the photovoltaic support. The application scenarios of the photovoltaic support include but are not limited to family residence, commercial building, industrial facility or agricultural technology greenhouse, and the embodiment does not limit this.
[0067] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the front and rear associated objects are in an "or" relationship.
[0068] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0069] In the description of the present application, "first feature" and "second feature" can include one or more features.
[0070] In the description of the present application, "a plurality of" means two or more.
[0071] In the description of the application, a first feature is "over", "above", or "on" a second feature can include the first and second features being directly in contact, or the first and second features not being directly in contact but being in contact through another feature between them.
[0072] In the description of the application, a first feature is "over", "above", and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is higher in level than the second feature.
[0073] In the description of the application, the description of the reference terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description of the application, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0074] Although the embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the application, and the scope of the application is defined by the claims and their equivalents.
Claims
1. A battery cell welding structure for connecting to a welding strip preform, characterized in that, include: A solar cell, wherein the solar cell is provided with multiple back electrodes; Multiple conductive elements are provided, with at least two of the conductive elements spaced apart on the side of the back electrode away from the battery cell, and the conductive elements are used for welding connection with the welding strip preform.
2. The battery cell welding structure according to claim 1, characterized in that, The length of the conductive element extends along a first horizontal direction, and at least two of the conductive elements are spaced apart along a second horizontal direction on the back electrode, wherein the first horizontal direction and the second horizontal direction intersect.
3. The battery cell welding structure according to claim 1, characterized in that, The edges of each conductive element are spaced apart from the edges of the corresponding back electrode.
4. The battery cell welding structure according to claim 1, characterized in that, The length of the back electrode extends along a first horizontal direction, the width of the back electrode is d1, the width of the conductive element is d2, and the width of the solder strip preform is d3, where d1 > d3 > d2; and / or Along the second horizontal direction, the edges of the conductive elements at the ends of each of the back electrodes are aligned with the edges of the solder strip preforms.
5. The battery cell welding structure according to claim 1, characterized in that, The cross-section of the conductive element includes at least one of square and elliptical shapes.
6. The battery cell welding structure according to claim 1, characterized in that, The conductive component is formed on the back electrode using a screen printing process.
7. The battery cell welding structure according to any one of claims 1 to 6, characterized in that, The battery cell has a positive electrode region and a negative electrode region. A portion of the plurality of back electrodes is arrayed in the positive electrode region, and another portion of the plurality of back electrodes is arrayed in the negative electrode region.
8. The battery cell welding structure according to claim 7, characterized in that, The positive electrode region and the negative electrode region are located on the same side of the battery cell.
9. A photovoltaic module, characterized in that, include: A battery string layer, wherein the battery string layer is prepared by welding multiple solder strip preforms and multiple battery cell welding structures as described in any one of claims 1 to 8.
10. A photovoltaic system, characterized in that, Including the photovoltaic module as described in claim 9.