Battery structure and photovoltaic modules

Abstract

This application relates to a battery structure and a photovoltaic module. The battery structure includes: a battery cell; an adhesive portion including multiple adhesive dots spaced apart along a first direction on the surface of the battery cell; and a conductive component, the conductive component having multiple first contact areas and multiple second contact areas on its surface facing the battery cell, the multiple first contact areas and multiple second contact areas being staggered along the first direction; wherein, the conductive component is fixed to the adhesive dots via the first contact areas, the adhesive dots electrically isolate the battery cell and the conductive component at the first contact areas, and the conductive component makes electrical contact with the battery cell outside the adhesive dots via the second contact areas, thus forming a discontinuous contact between the conductive component and the battery cell. This approach minimizes the occurrence of hot spot effects during the practical application of the photovoltaic module, while also reducing manufacturing costs, ensuring process stability, simplifying the manufacturing process, and guaranteeing the reliability of the photovoltaic module.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to a battery structure and a photovoltaic module. Background Technology

[0002] Currently, photovoltaic (PV) module interconnection primarily involves welding pads (soldering pads) created using metallization paste in localized areas of the cell's main grid. A rapid welding process then connects the solder strips to these pads, forming a stable and reliable electrical bond – this is the stringing stage of PV module manufacturing. However, welding pads and traditional cell main grids consume large amounts of metallization paste, requiring significant amounts of grid paste to ensure welding quality and provide sufficient tension between the solder strips and the cells. Furthermore, the welding pads can cause some shading on the front side of the cells, significantly reducing the light-receiving area. Ultimately, this limits the photoelectric conversion efficiency of the cells and makes further cost reductions difficult.

[0003] In light of this, the industry has proposed a novel type of grid-free solar cell and grid-free module. This cell has no traditional grid lines or welding pads on its front and back sides. Compared to traditional solar cells, grid-free cells significantly optimize photoelectric conversion efficiency and metallization paste usage. Currently, the main grid-free interconnect and module technologies based on grid-free cells include the following: Solution 1: After the solar cell is loaded, UV-curable adhesive is printed, solder ribbons are arranged and cured with UV light, and then lamination welding is performed; Solution 2: After the solar cell is loaded, thermosetting adhesive is printed, solder ribbons are arranged and cured by heating, and then lamination welding is performed; Solution 3: After the solar cell is loaded, solder ribbons are arranged, a protective film for the solder ribbons is laid, the protective film is heated to fix the solder ribbons, and then lamination welding is performed; Solution 4: After the solar cell is loaded, solder ribbons are arranged, instantaneous high-temperature welding is used for fixation, UV-curable adhesive is applied in conjunction with UV curing of the solder ribbons, and then lamination welding is performed.

[0004] However, Options 1, 2, and 3 all require the use of solder ribbon protective film, which is costly. During the practical application of photovoltaic modules, hot spot effects are unavoidable. Hot spot temperatures are typically higher than the melting point of the solder ribbon, potentially leading to secondary melting of the solder ribbon and further weakening of the electrical connection. Option 4 uses medium-high temperature solder ribbon and does not use solder ribbon protective film, resulting in a relatively lower cost. However, its cell string manufacturing process is complex, potentially leading to poor electrical connections in the cell strings and making process control more difficult. Summary of the Invention

[0005] Therefore, it is necessary to provide a cell structure and photovoltaic module that can guarantee the light-receiving area of ​​the cell and avoid the hot spot effect during the practical application of the photovoltaic module, while eliminating the need for solder ribbon protective film, reducing manufacturing costs and simplifying the manufacturing process.

[0006] A battery structure, comprising:

[0007] Battery cells;

[0008] The adhesive portion includes a plurality of adhesive dots, which are spaced apart along a first direction on the surface of the battery cell; and

[0009] A conductive component, the conductive component having a plurality of first contact areas and a plurality of second contact areas on its surface facing the battery cell, the plurality of first contact areas and the plurality of second contact areas being arranged alternately along the first direction;

[0010] The conductive component is fixed to the fixing adhesive point through the first contact area. The fixing adhesive point can electrically isolate the battery cell from the conductive component in the first contact area. The conductive component is in electrical contact with the area of ​​the battery cell other than the fixing adhesive point through the second contact area, so that a discontinuous contact is formed between the conductive component and the battery cell.

[0011] In one embodiment of this application, the battery cell has a plurality of grid lines, the plurality of grid lines are spaced apart on the surface of the battery cell along a first direction, and the grid lines extend along a second direction perpendicular to the first direction, and the battery cell forms a connection area between adjacent grid lines;

[0012] Multiple adhesive dots are provided on the connection area and / or the grid lines, and the conductive component is in electrical contact with the grid lines and the connection area of ​​the battery cell, excluding the adhesive dots, through the second contact area.

[0013] In one embodiment of this application, each of the connection areas is provided with the fixing adhesive dots; or,

[0014] The fixing adhesive dots are provided in a portion of the connection area, at least some of the fixing adhesive dots are arranged adjacent to each other, and / or, at least some of the fixing adhesive dots are spaced apart by at least one connection area.

[0015] In one embodiment of this application, each of the grid lines is provided with the fixing adhesive dot; or,

[0016] The fixing adhesive dots are provided on some of the grid lines, and at least some of the fixing adhesive dots are arranged adjacent to each other, and / or, at least some of the fixing adhesive dots are spaced apart by at least one grid line.

[0017] In one embodiment of this application, there are multiple adhesive portions, which are spaced apart on the surface of the battery cell along a second direction perpendicular to the first direction, and each adhesive portion is connected to a conductive component.

[0018] In one embodiment of this application, the fixing adhesive dots at least partially cover the conductive component along the circumferential direction of the conductive component;

[0019] And / or, the conductive component includes a conductor and a metal solder, the metal solder covering the outside of the conductor, and the metal solder making electrical contact with the battery cell in the second contact area.

[0020] In one embodiment of this application, the shape of the fixing adhesive dots is hemispherical, square, straight-line splicing, curved-line splicing, or a combination of straight and curved lines;

[0021] The shapes of the fixed adhesive dots are the same and / or different.

[0022] In one embodiment of this application, the ratio of the sum of the lengths TD1 of each of the first contact areas along the first direction to the length L of the battery cell is: TD1 / L≤50%;

[0023] And / or, the ratio of the sum of the lengths TD1 of each of the first contact areas along the first direction to the length L of the battery cell is: TD1 / L≥1%.

[0024] In one embodiment of this application, the distance between any two adjacent first contact areas along the first direction is equal and / or different;

[0025] And / or, the dimensions of each of the first contact areas along the first direction are the same and / or different.

[0026] A photovoltaic module includes a battery string, a cover plate, and a back sheet. The cover plate and the back sheet are disposed on both sides of the battery string, and the cover plate, the back sheet, and the battery string are encapsulated using an encapsulation process.

[0027] The battery string includes multiple battery structures as described in any of the above technical features, and the multiple battery structures are connected in series to form the battery string.

[0028] By adopting the above technical solution, this application has at least the following technical effects:

[0029] The battery structure and photovoltaic module of this application have a fixing adhesive point that electrically isolates the battery cell from the conductive component at the first contact area, and multiple second contact areas of the conductive component that can make electrical contact with areas of the battery cell other than the fixing adhesive point. In this way, the conductive component and the battery cell are electrically isolated by the fixing adhesive point, while the conductive component makes electrical contact with the battery cell in other areas, so that a discontinuous contact can be formed between the battery cell and the conductive component.

[0030] Thus, the use of multiple spaced adhesive dots ensures reliable fixation of conductive components, prevents reduction in the light-receiving area of ​​the solar cells, minimizes hot spot effects during photovoltaic module operation, and guarantees reliable electrical contact between conductive components and solar cells. When using the cell structure described in this application to fabricate photovoltaic modules, low-temperature, long-time welding can be used to fix conductive components and solar cells, eliminating the need for solder ribbon protective film, reducing manufacturing costs. Furthermore, the cell string fabrication process does not require flipping, ensuring process stability, simplifying the photovoltaic module manufacturing process, and guaranteeing the reliability of the photovoltaic modules. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the battery structure in one embodiment of this application.

[0032] Figure 2 for Figure 1 A partial 3D view of the battery structure shown.

[0033] Figure 3 for Figure 2 The diagram shows a cross-sectional view of one embodiment of the battery structure along a first direction.

[0034] Figure 4 for Figure 2 A cross-sectional view of another embodiment of the battery structure shown along the first direction.

[0035] Figure 5 for Figure 2 A cross-sectional view of another embodiment of the battery structure shown along the first direction.

[0036] Figure 6 for Figure 3 The battery structure shown is a cross-sectional view at point AA.

[0037] Figure 7 for Figure 3 The battery structure shown is a cross-sectional view at BB.

[0038] Figure 8 for Figure 5 The battery structure shown is a cross-sectional view at CC.

[0039] Figure 9 for Figure 4 The battery structure shown is a cross-sectional view at DD.

[0040] Figure 10 for Figure 2 A side view of the battery structure shown.

[0041] Wherein: 100, battery structure; 110, battery cell; 111, grid line; 112, connection area; 120, adhesive part; 121, fixing glue point; 130, conductive component; 131, first contact area; 132, second contact area; 133, conductor; 134, metal solder. Detailed Implementation

[0042] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0043] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0048] Understandably, current photovoltaic module interconnection mainly relies on solder pads (pads) made of metallization paste in localized areas of the cell's main grid. A transient soldering process then connects the solder ribbon to the solder pads, creating a stable and reliable electrical bond. However, solder pads reduce the light-receiving area of ​​the cell, affecting photoelectric conversion efficiency and increasing costs. Therefore, a grid-less cell has been proposed, which can maintain photoelectric conversion efficiency and reduce the amount of metallization paste used. However, current grid-less cell fabrication requires the use of a protective film for the solder ribbon, which can lead to hot spots, weakened electrical connections, and a complex string fabrication process with significant manufacturing control challenges.

[0049] See Figure 1 and Figure 2 Therefore, this application provides a novel battery structure 100. Figure 1 This is a schematic diagram of the battery structure 100 in one embodiment of this application. Figure 2 for Figure 1 The diagram shows a partial perspective view of the battery structure 100. The battery structures 100, when interconnected, can form battery strings (not shown). These battery strings, when encapsulated using a packaging process, can form a photovoltaic module (not shown). The battery structure 100 of this application ensures the light-receiving area of ​​the battery cells 110 and avoids hot spot effects in the photovoltaic module during practical use. Furthermore, it eliminates the need for a solder ribbon protective film, reducing manufacturing costs and simplifying the manufacturing process. The specific structure of a battery structure 100 according to one embodiment is described below.

[0050] See Figure 1 and Figure 2 In one embodiment, the battery structure 100 includes a battery cell 110, an adhesive portion 120, and a conductive component 130. The adhesive portion 120 includes a plurality of fixing adhesive dots 121, which are spaced apart along a first direction on the surface of the battery cell 110. The conductive component 130 has a plurality of first contact areas 131 and a plurality of second contact areas 132 on its surface facing the battery cell 110, and the plurality of first contact areas 131 and the plurality of second contact areas 132 are arranged alternately along the first direction. The conductive component 130 is fixed to the fixing adhesive dots 121 through the first contact areas 131. The fixing adhesive dots 121 can electrically isolate the battery cell 110 and the conductive component 130 through the first contact areas 131. The conductive component 130 is in electrical contact with the area of ​​the battery cell 110 other than the fixing adhesive dots 121 through the second contact areas 132, so that a discontinuous contact is formed between the conductive component 130 and the battery cell 110.

[0051] The solar cell 110 is made of silicon wafer. It absorbs solar energy and converts it into electrical energy. The specific structure and principle of the solar cell 110 are existing technology and will not be described further here. The solar cell 110 extends along a first direction and a second direction. The first direction and the second direction are as follows... Figure 1 and Figure 2 As shown, the first direction is perpendicular to the second direction. The first direction is the length direction of the battery cell 110, and the second direction is the width direction of the battery cell 110. The battery cell 110 has a certain length dimension along the first direction and a certain width dimension along the second direction.

[0052] An adhesive portion 120 is disposed on the surface of the battery cell 110 along a first direction, and a conductive component 130 is disposed on the adhesive portion 120 and makes electrical contact with the battery cell 110. It is understood that the battery cell 110 has a front and a back side disposed opposite to each other, such as... Figure 2 and Figure 3 As shown, Figure 3 for Figure 2 The diagram shows a cross-sectional view of one embodiment of the battery structure 100 along a first direction. Figure 3 In this design, the upper surface of the battery cell 110 is the front surface, and the lower surface is the back surface. Both the front and back surfaces of the battery cell 110 have adhesive portions 120, and each adhesive portion 120 fixes a conductive component 130. Furthermore, the vertical direction of this application... Figure 2 and Figure 3 The direction shown is the reference.

[0053] In other words, conductive components 130 are provided on both the upper surface (front) and lower surface (back) of the battery cell 110, and the conductive components 130 are fixed to the surface of the battery cell 110 by corresponding adhesive portions 120. It is worth noting that the principle of providing adhesive portions 120 and conductive components 130 on the upper surface of the battery cell 110 is essentially the same as the principle of providing adhesive portions 120 and conductive components 130 on the lower surface. In the following text, only the example of providing adhesive portions 120 and conductive components 130 on the upper surface of the battery cell 110 will be used for explanation.

[0054] An adhesive portion 120 is disposed on the surface of the solar cell 110, and a conductive component 130 is disposed on the adhesive portion 120 and makes electrical contact with the area of ​​the solar cell 110 other than the adhesive portion 120. The adhesive portion 120 can reliably fix the conductive component 130 to the solar cell 110 without the need for a welding pad. The adhesive portion 120 provides sufficient tension between the conductive component 130 and the solar cell 110, ensuring reliable connection between the conductive component 130 and the solar cell 110, reducing costs, and also reducing light shading to ensure photoelectric conversion efficiency.

[0055] Simultaneously, the conductive component 130 can also make electrical contact with areas of the battery cell 110 other than the adhesive portion 120, in order to collect the current generated by the battery cell 110. Specifically, the adhesive portion 120 includes a plurality of fixing adhesive dots 121, which are spaced apart along a first direction, that is, there is a certain distance between two adjacent fixing adhesive dots 121 along the first direction. The lower surface of the conductive component 130 has a plurality of first contact areas 131 and a plurality of second contact areas 132, which are correspondingly arranged with the fixing adhesive dots 121, and are staggered along the first direction.

[0056] When the conductive component 130 is connected to the adhesive portion 120 and the battery cell 110, the conductive component 130 is fixed to the adhesive portion 120 through the first contact area 131, and the conductive component 130 is connected to the battery cell 110 through the second contact area 132. It is understood that during the fabrication of the battery structure 100, the adhesive portion 120 is first disposed on the battery cell 110, and then the first contact area 131 of the conductive component 130 is disposed on the fixing adhesive point 121. Thus, the fixing adhesive point 121 is positioned such that the first contact area 131 does not contact the battery cell 110, that is, the conductive component 130 is electrically isolated from the battery cell 110 at the position of the first contact area 131, and the conductive component 130 is electrically in contact with the area of ​​the battery cell 110 other than the fixing adhesive point 121 at the position of the second contact area 132.

[0057] In other words, the adhesive dots 121 electrically isolate the conductive component 130 from the battery cell 110 in the first contact area 131, ensuring an insulating relationship between the first contact area 131 of the conductive component 130 and the battery cell 110. The second contact area 132 of the conductive component 130 can then make electrical contact with areas of the battery cell 110 without adhesive dots 121. Specifically, in some areas of the battery cell 110, the conductive component 130 and the battery cell 110 are electrically isolated by the adhesive dots 121, while in other areas, the conductive component 130 and the battery cell 110 form normal electrical contact. Thus, compared to the current method of full contact between the conductive component 130 and the battery cell 110, this application, through multiple adhesive dots 121 spaced apart along a first direction, enables a discontinuous contact between the battery cell 110 and the conductive component 130.

[0058] The battery structure 100 of the above embodiment, through multiple spaced fixing adhesive dots 121, enables the battery cell 110 and the conductive component 130 to form a discontinuous contact, achieving reliable fixation between the conductive component 130 and the battery cell 110. This also prevents a reduction in the light-receiving area of ​​the battery cell 110, thereby minimizing the occurrence of hot spot effects during the practical application of the photovoltaic module and ensuring the reliability of the electrical contact between the conductive component 130 and the battery cell 110. When using the battery structure 100 of this application to manufacture photovoltaic modules, low-temperature long-time welding can be used to fix the conductive component 130 and the battery cell 110, eliminating the need for solder ribbon protective film, reducing manufacturing costs. Furthermore, the battery string fabrication process does not require flipping, ensuring process stability, simplifying the manufacturing process of the photovoltaic module, and guaranteeing the reliability of the photovoltaic module.

[0059] Of course, the structure in this application, in which multiple fixing adhesive points 121 make non-continuous contact between the conductive component 130 and the battery cell 110, can also be applied to the battery cell 110 with a welding pad. This application only describes the battery cell 110 without a welding pad as an example.

[0060] See Figures 1 to 3 In one embodiment, the battery cell 110 has multiple grid lines 111, which are spaced apart along a first direction on the surface of the battery cell 110 and extend along a second direction perpendicular to the first direction. A connection region 112 is formed between adjacent grid lines 111 in the battery cell 110. Multiple adhesive dots 121 are disposed in the connection region 112 and / or the grid lines 111. A conductive component 130 makes electrical contact with the grid lines 111 and the connection region 112 of the battery cell 110, excluding the adhesive dots 121, through a second contact area 132.

[0061] The solar cell 110 has a gridless structure, with multiple grid lines 111 disposed on its upper surface. The grid lines 111 are used to collect the current of the solar cell 110. The grid lines 111 extend along a second direction, and the multiple grid lines 111 are spaced apart along a first direction. There is a certain distance between adjacent grid lines 111 along the first direction. The grid lines 111 intersect with the conductive component 130. Furthermore, the grid lines 111 are perpendicular to the conductive component 130, so that the conductive component 130 can make electrical contact with the grid lines 111 to collect and transmit current in the first direction perpendicular to the grid lines 111.

[0062] To facilitate the description of the placement of the fixing adhesive dots 121, the area of ​​the battery cell 110 between two grid lines 111 is referred to as the connection area 112. The battery cell 110 has multiple connection areas 112, which are staggered with the grid lines 111 along a first direction. A connection area 112 is located between two adjacent grid lines 111, and a grid line 111 is located between adjacent connection areas 112. Multiple fixing adhesive dots 121 are located in the connection areas 112 and / or grid lines 111. Thus, after the first contact area 131 of the conductive component 130 is fixed to the fixing adhesive dots 121, the first contact area 131 is electrically isolated from the connection areas 112 and / or grid lines 111 through the fixing adhesive dots 121. The conductive component 130 makes electrical contact with the connection areas 112 and grid lines 111 of the battery cell 110 other than the fixing adhesive dots 121 through the second contact area 132.

[0063] like Figure 3 As shown, in one embodiment of this application, fixing adhesive dots 121 are provided on the connection area 112 and the grid line 111, and the conductive component 130 is in electrical contact with the connection area 112 and the grid line 111 of the battery cell 110 except for the fixing adhesive dots 121.

[0064] In other words, in this embodiment, the fixing adhesive dots 121 are distributed in the connection area 112 and the grid line 111. In the area with fixing adhesive dots 121, the fixing adhesive dots 121 electrically isolate the conductive component 130 from the battery cell 110. In the area without fixing adhesive dots 121, the conductive component 130 directly contacts the battery cell 110, so as to achieve discontinuous contact between the conductive component 130 and the battery cell 110.

[0065] like Figure 4 As shown, Figure 4 for Figure 2 The diagram shows a cross-sectional view of another embodiment of the battery structure 100 along a first direction. In another embodiment of this application, a fixing adhesive point 121 is provided in the connection region 112, and the conductive component 130 is in electrical contact with the connection region 112 and the grid line 111 of the battery cell 110, excluding the fixing adhesive point 121.

[0066] In other words, in this embodiment, the fixing adhesive dots 121 are distributed in the connection area 112, while the area of ​​the grid lines 111 is not provided with fixing adhesive dots 121. The conductive component 130 is in electrical contact with all the grid lines 111 and also in electrical contact with the area of ​​the connection area 112 except for the fixing adhesive dots 121. In the area with fixing adhesive dots 121, the fixing adhesive dots 121 electrically isolate the conductive component 130 from the battery cell 110. In the area without fixing adhesive dots 121, the conductive component 130 is in direct electrical contact with the battery cell 110, thereby achieving discontinuous contact between the conductive component 130 and the battery cell 110.

[0067] like Figure 5 As shown, Figure 5 for Figure 2 The diagram shows a cross-sectional view of another embodiment of the battery structure 100 along a first direction. In yet another embodiment of this application, fixing adhesive dots 121 are provided on the grid lines 111, and the conductive component 130 is in electrical contact with the connection area 112 of the battery cell 110 other than the fixing adhesive dots 121 and the grid lines 111.

[0068] In other words, in this embodiment, the fixing adhesive dots 121 are distributed on the grid lines 111, while the connection areas 112 are not provided with fixing adhesive dots 121. The conductive component 130 is in electrical contact with all connection areas 112, and also in electrical contact with the areas of the grid lines 111 except for the fixing adhesive dots 121. In the areas with fixing adhesive dots 121, the conductive component 130 and the battery cell 110 are electrically isolated by the fixing adhesive dots 121. In the areas without fixing adhesive dots 121, the conductive component 130 is in direct electrical contact with the battery cell 110, thereby achieving discontinuous contact between the conductive component 130 and the battery cell 110.

[0069] See Figure 3 and Figure 4 In one embodiment, the length of the fixing adhesive dot 121 along the first direction is less than the length of the connecting region 112 along the first direction. After the fixing adhesive dot 121 is provided in the connecting region 112, the fixing adhesive dot 121 only partially covers the connecting region 112 in the first direction, and there is a certain distance between the fixing adhesive dot 121 and the grid line 111 on at least one side in the first direction.

[0070] Thus, after the conductive component 130 is disposed on the fixing adhesive point 121 through the first contact area 131, the conductive component 130 can also make electrical contact with the connection area 112 where the fixing adhesive point 121 is located through the second contact area 132, so as to ensure the electrical contact area between the conductive component 130 and the battery cell 110, thereby ensuring the electrical connection effect between the conductive component 130 and the battery cell 110 and avoiding affecting the conductivity of the battery structure 100.

[0071] See Figure 3 and Figure 5In one embodiment, the length of the fixing adhesive dot 121 along the first direction is less than the length of the grid line 111 along the first direction. The fixing adhesive dot 121 is disposed after the grid line 111, and the fixing adhesive dot 121 only partially covers the grid line 111 in the first direction. There is a certain distance between the fixing adhesive dot 121 and the connection area 112 on at least one side in the first direction.

[0072] Thus, after the conductive component 130 is disposed on the fixing adhesive point 121 through the first contact area 131, the conductive component 130 can also make electrical contact with the grid line 111 where the fixing adhesive point 121 is located through the second contact area 132, so as to ensure the electrical contact area between the conductive component 130 and the battery cell 110, thereby ensuring the electrical contact effect between the conductive component 130 and the battery cell 110.

[0073] To better illustrate the connection between the conductive component 130 and the battery cell 110, a cross-sectional view along the second direction is provided here. See [link to documentation]. Figure 3 , Figures 6 to 9 , Figure 6 for Figure 3 The cross-sectional view of the battery structure 100 shown at point AA. Figure 7 for Figure 3 The cross-sectional view of the battery structure 100 shown is located at BB. Figure 8 for Figure 5 The cross-sectional view of the battery structure 100 shown at CC is shown. Figure 9 for Figure 4 The battery structure 100 shown is a cross-sectional view at DD. Furthermore, Figures 6 to 9 Conductive components 130 are provided on both the upper and lower surfaces of the battery cell 110.

[0074] exist Figure 6 In the first structure shown, the fixing adhesive point 121 is disposed in the connection area 112, and the conductive component 130 is connected to the fixing adhesive point 121 through the first contact area 131. Figure 6 In this process, the lower surface of the conductive component 130 is separated from the battery cell 110 by the fixing adhesive dots 121, so that the conductive component 130 is electrically isolated from the battery cell 110 in the first contact area 131, thereby forming a discontinuous contact between the battery cell 110 and the conductive component 130.

[0075] exist Figure 7 In the second structure shown, the fixing adhesive point 121 is disposed on the grid line 111, and the conductive component 130 is connected to the fixing adhesive point 121 through the first contact area 131. Figure 7 In this process, the lower surface of the conductive component 130 is separated from the battery cell 110 by the fixing adhesive dots 121, so that the conductive component 130 is electrically isolated from the battery cell 110 in the first contact area 131, thereby forming a discontinuous contact between the battery cell 110 and the conductive component 130.

[0076] exist Figure 8 In the third structure shown, the conductive component 130 is in direct electrical contact with the connection area 112 of the battery cell 110, and the fixing adhesive point 121 can be located at other positions in the connection area 112, such as... Figure 3 As shown, the fixing adhesive point 121 may not be provided in the connection area 112, such as... Figure 5 As shown. In Figure 9 In the fourth structure shown, the conductive component 130 is in direct electrical contact with the grid lines 111 of the battery cell 110, and the fixing adhesive points 121 can be disposed at other locations on the grid lines 111, such as... Figure 3 As shown, the fixing adhesive point 121 may not be set on the grid line 111, such as... Figure 4 As shown.

[0077] It is worth noting that in the battery structure 100 of this application, the fixing adhesive point 121 can adopt one or both of the first and second structures, and also includes one or both of the third and fourth structures. Optionally, the connection between the conductive component 130 and the battery cell 110 in the battery structure 100 can adopt the first structure, the second structure, or the first structure, the second structure, the third structure, and the fourth structure, such as... Figure 3 As shown.

[0078] Optionally, the connection between the conductive component 130 and the battery cell 110 in the battery structure 100 can also adopt the first structure and the fourth structure, such as... Figure 4 As shown. Optionally, the connection between the conductive component 130 and the battery cell 110 in the battery structure 100 can also adopt a second or third structure, such as... Figure 5 As shown.

[0079] Of course, in other embodiments of this application, the connection between the conductive component 130 and the battery cell 110 in the battery structure 100 may also adopt a combination of at least two of the first structure, second structure, third structure and fourth structure, as long as a non-continuous contact can be formed between the conductive component 130 and the battery cell 110.

[0080] It is worth noting that the location and number of the fixing adhesive dots 121 are not limited in principle, as long as the fixing adhesive dots 121 can reliably fix the conductive component 130 to the battery cell 110 and ensure that a non-continuous contact is formed between the conductive component 130 and the battery cell 110. Several layout methods of fixing adhesive dots 121 are introduced below, but the fixing adhesive dots 121 are not limited to the following methods.

[0081] See Figure 3 and Figure 4In one embodiment, each connection region 112 is provided with a fixing adhesive dot 121. That is, each connection region 112 of the battery cell 110 is provided with a fixing adhesive dot 121, and the fixing adhesive dot 121 achieves discontinuous contact between the conductive component 130 and the battery cell 110. Further, in this embodiment, the fixing adhesive dot 121 can be provided on the grid line 111, that is, both the connection region 112 and the grid line 111 have fixing adhesive dots 121, such as... Figure 3 As shown, the fixing adhesive dots 121 may not be provided on the grid line 111, that is, the fixing adhesive dots 121 are only provided in the connection area 112, such as... Figure 4 As shown.

[0082] Of course, in other embodiments of this application, fixing adhesive dots 121 are provided in a portion of the connection area 112. That is, fixing adhesive dots 121 can be provided only in a portion of the connection area 112, and the non-continuous contact between the conductive component 130 and the battery cell 110 can be achieved through the fixing adhesive dots 121, while also ensuring the reliability of the connection between the conductive component 130 and the battery cell 110.

[0083] When fixing adhesive dots 121 are provided in a portion of the connection area 112, the placement of the fixing adhesive dots 121 is generally unrestricted. Optionally, at least some fixing adhesive dots 121 can be arranged adjacently, and / or at least some fixing adhesive dots 121 can be spaced apart by at least one connection area 112. That is, each fixing adhesive dot 121 can be arranged adjacently in each connection area 112, with no blank connection area 112 between adjacent fixing adhesive dots 121; each fixing adhesive dot 121 can be arranged spaced apart in each connection area 112, with at least one blank connection area 112 between adjacent fixing adhesive dots 121; of course, some fixing adhesive dots 121 can also be arranged adjacently, and some fixing adhesive dots 121 can be arranged spaced apart.

[0084] See Figure 3 In one embodiment, each grid line 111 is provided with a fixing adhesive dot 121. That is, each grid line 111 of the battery cell 110 is provided with a fixing adhesive dot 121, and the fixing adhesive dot 121 achieves discontinuous contact between the conductive component 130 and the battery cell 110. Further, in this embodiment, the fixing adhesive dot 121 can be provided on the connection area 112, that is, both the connection area 112 and the grid line 111 have fixing adhesive dots 121, such as... Figure 3 As shown, it is also possible not to set the fixing adhesive point 121 on the connection area 112, that is, only the grid line 111 has the fixing adhesive point 121.

[0085] Of course, in other embodiments of this application, some grid lines 111 are provided with fixing adhesive dots 121, such as... Figure 5As shown. In other words, fixing adhesive dots 121 can be set only on a portion of the grid lines 111. The non-continuous contact between the conductive component 130 and the battery cell 110 can be achieved through the fixing adhesive dots 121, while ensuring the reliability of the connection between the conductive component 130 and the battery cell 110.

[0086] When fixing adhesive dots 121 are provided on some of the grid lines 111, the placement of the fixing adhesive dots 121 is generally unrestricted. Optionally, at least some of the fixing adhesive dots 121 are arranged adjacent to each other, and / or, at least some of the fixing adhesive dots 121 are spaced apart by at least one grid line 111. That is, each fixing adhesive dot 121 can be arranged adjacently on each grid line 111, and there is no blank grid line 111 between adjacent fixing adhesive dots 121; each fixing adhesive dot 121 can be arranged at intervals on each grid line 111, and there is at least one blank grid line 111 between adjacent fixing adhesive dots 121, such as... Figure 5 As shown; of course, some of the fixed adhesive dots 121 can be arranged adjacently, and some of the fixed adhesive dots 121 can be arranged at intervals.

[0087] See Figure 1 In one embodiment, the ratio of the sum of the lengths TD1 of each first contact area 131 along the first direction to the length L of the battery cell 110 is: TD1 / L≤50%, and / or the ratio of the sum of the lengths TD1 of each first contact area 131 along the first direction to the length L of the battery cell 110 is: TD1 / L≥1%.

[0088] The length of the first contact area 131 along the first direction is denoted as D1, the length of the second contact area 132 along the first direction is denoted as D2, the sum of the lengths of all the first contact areas 131 along the first direction is TD1, the length of all the second contact areas 132 along the first direction is TD2, and the length of the battery cell 110 along the first direction is denoted as L. Wherein, TD1 / L≤50%, TD2 / L≤99%, that is, 1%≤TD1 / L≤50%.

[0089] Thus, with the lengths of the first contact area 131 and the second contact area 132 along the first direction within the aforementioned size range, it is possible to ensure that the conductive component 130 is reliably fixed to the battery cell 110 by the fixing adhesive point 121, preventing the conductive component 130 from detaching from the battery cell 110. At the same time, it is also possible to ensure the electrical contact performance between the conductive component 130 and the battery cell 110, so that the conductive component 130 can normally collect the current generated by the battery cell 110.

[0090] In one embodiment, the distance between any two adjacent first contact areas 131 along the first direction is equal and / or different. The distance between two adjacent first contact areas 131 is the distance between two adjacent fixing adhesive dots 121, and there is a certain spacing between two adjacent fixing adhesive dots 121 along the first direction. Optionally, the fixing adhesive dots 121 are arranged at equal intervals along the first direction; alternatively, the fixing adhesive dots 121 may also be arranged at non-equal intervals along the first direction; alternatively, some fixing adhesive dots 121 are arranged at equal intervals along the first direction, and some fixing adhesive dots 121 are arranged at non-equal intervals along the first direction.

[0091] It is worth noting that the distance between two adjacent fixing adhesive points 121 is not limited in principle, as long as it can be ensured that the conductive component 130 is reliably fixed to the battery cell 110 through the fixing adhesive points 121, and that a non-continuous contact is formed between the conductive component 130 and the battery cell 110.

[0092] In one embodiment, the dimensions of each first contact area 131 along the first direction are the same and / or different. The dimensions of the first contact area 131 along the first direction are the dimensions of the fixing adhesive dots 121 along the first direction. Optionally, the dimensions of each fixing adhesive dot 121 along the first direction are the same; alternatively, the dimensions of each fixing adhesive dot 121 along the first direction are different; alternatively, some fixing adhesive dots 121 have the same dimensions along the first direction, and some fixing adhesive dots 121 have different dimensions along the first direction.

[0093] It is worth noting that the size of the fixing adhesive point 121 along the first direction is not limited in principle, as long as the fixing adhesive point 121 can ensure that the conductive component 130 is reliably fixed to the battery cell 110 and that a non-continuous contact is formed between the conductive component 130 and the battery cell 110.

[0094] Furthermore, the shape of the fixing adhesive dots 121 is not limited in principle, as long as the fixing adhesive dots 121 can achieve electrical isolation between the conductive component 130 and the battery cell 110. Optionally, the shape of the fixing adhesive dots 121 can be hemispherical, square, straight-line splicing, curved splicing, straight and curved splicing, or other shapes.

[0095] For example, such as Figure 2 and Figure 10 As shown, the shape of the fixing glue point 121 is hemispherical, that is, the outer contour of the fixing glue point 121 is semi-circular. Figure 10 for Figure 2 The image shows a side view of the battery structure 100. Of course, in other embodiments of this application, the fixing adhesive dots 121 may also be square or other regular or irregular shapes.

[0096] In one embodiment, the shapes of the fixing adhesive dots 121 are the same and / or different. Optionally, the shapes of the fixing adhesive dots 121 are the same; alternatively, the shapes of the fixing adhesive dots 121 are different; alternatively, some fixing adhesive dots 121 have the same shape, and some fixing adhesive dots 121 have different shapes. It is worth noting that the shape of the fixing adhesive dots 121 is not limited in principle, as long as the fixing adhesive dots 121 can ensure that the conductive component 130 is reliably fixed to the battery cell 110 and ensure that a non-continuous contact is formed between the conductive component 130 and the battery cell 110.

[0097] See Figure 1 , Figure 6 and Figure 7 In one embodiment, there are multiple adhesive portions 120, which are spaced apart on the surface of the battery cell 110 along a second direction perpendicular to the first direction. That is, the surface of the battery cell 110 is provided with multiple adhesive portions 120 spaced apart along the second direction, and each adhesive portion 120 fixes a conductive component 130. Thus, adjacent battery cells 110 can be connected through multiple conductive components 130 to collect the current generated by two adjacent battery cells 110, thereby realizing the fabrication of a battery string. Optionally, the layout of the fixing adhesive dots 121 in each adhesive portion 120 may be the same or different.

[0098] In one embodiment, the fixing adhesive dots 121 are formed from an adhesive that can be catalytically cured by curing conditions. In one embodiment, the curing conditions for the fixing adhesive dots 121 can be light, heat, or other types of catalytic conditions. That is, the fixing adhesive dots 121 can be cured by light curing, by heat curing, or by other curing methods.

[0099] It is worth noting that the type of conductive component 130 is not limited in principle, as long as the conductive component 130 is conductive, and those skilled in the art can choose according to their needs. For example, the conductive component 130 is a solder strip. Of course, in other embodiments of this application, the conductive component 130 can also be a connecting wire, a conductive strip, etc. The conductive component 130 extends along a first direction to electrically connect two adjacent battery cells 110.

[0100] In one embodiment, the adhesive dots 121 at least partially cover the conductive member 130 along its circumference. That is, the adhesive dots 121 can cover at least the bottom of the conductive member 130 at the first contact area 131 of the conductive member 130 to electrically isolate the first contact area 131 of the conductive member 130 from the battery cell 110.

[0101] See Figure 2 , Figure 6 , Figure 7 and Figure 10 The adhesive dots 121 cover the conductive component 130 along its circumferential direction, and also cover the first contact area 131 of the conductive component 130. Of course, in other embodiments of this application, the adhesive dots 121 may also completely cover the conductive component 130 circumferentially at the location of the first contact area 131.

[0102] See Figures 6 to 10 In one embodiment, the conductive component 130 includes a conductor 133 and a metal solder 134. The metal solder 134 covers the outer side of the conductor 133 and makes electrical contact with the battery cell 110 in the second contact area 132. In areas with fixing adhesive dots 121, the fixing adhesive dots 121 electrically isolate the metal solder 134 from the battery cell 110. In areas without fixing adhesive dots 121, the metal solder 134 can directly make electrical contact with the battery cell 110. The metal solder 134 is used to achieve electrical connection with the connection area 112 and the grid lines 111 of the battery cell 110, so that the conductor 133 can collect the current generated by the battery cell 110.

[0103] like Figures 6 to 10 As shown, the metal solder 134 covers the outer side of the conductor 133 and is deposited on both sides. Optionally, the conductor 133 is typically a copper strip. Of course, in other embodiments of this application, the conductor 133 may also be other conductive materials with good conductivity. Optionally, the metal solder 134 includes, but is not limited to, multi-element solders composed of tin, lead, bismuth, silver, etc., and the melting point of the metal solder 134 can range from 140°C to 250°C. Optionally, the conductive component 130 may also contain flux-like substances that remove the oxide layer on the surface of the solder strip.

[0104] The battery structure 100 of this application achieves discontinuous contact between the conductive component 130 and the solar cell 110 through multiple spaced fixing adhesive dots 121, ensuring reliable fixation of the conductive component 130 and preventing a reduction in the light-receiving area of ​​the solar cell 110. This minimizes the occurrence of hot spot effects during the practical application of the photovoltaic module and ensures the reliability of the electrical contact between the conductive component 130 and the solar cell 110. When using the battery structure 100 of this application to manufacture photovoltaic modules, low-temperature long-time welding can be used to fix the conductive component 130 and the solar cell 110, eliminating the need for solder ribbon protective film, reducing manufacturing costs. Furthermore, the cell string fabrication process does not require flipping, ensuring process stability, simplifying the manufacturing process of photovoltaic modules, and guaranteeing the reliability of the photovoltaic modules.

[0105] This application also provides a photovoltaic module, including a cell string, a cover plate, and a backsheet. The cover plate and backsheet are disposed on both sides of the cell string, and the cover plate, backsheet, and cell string are encapsulated using an encapsulation process. The cell string includes multiple cell structures 100 as described in any of the above embodiments, and the multiple cell structures 100 are connected in series to form a cell string. In the above embodiments, the cell structures 100 electrically contact adjacent cell cells 110 through conductive components 130 to form a cell string, and then are encapsulated using an encapsulation process to form a photovoltaic module.

[0106] Optionally, electrical contact can be physical contact, or it can be formed by metal solder 134 and the cell 110 to form a tensile alloy structure. When the cell string is packaged to form a photovoltaic module, a low-temperature long-time welding method is used for welding. The cell string is placed on a heated base plate, and the conductive component 130 connects two adjacent cells 110. An ultra-long welding mechanism is used to simultaneously weld multiple cells 110 at low temperature. At this time, the ultra-long welding mechanism and the heated base plate can make the fixing adhesive points 121 on the upper and lower surfaces of the cell 110 cure at the same time without flipping the cell 110 and ensuring the welding effect.

[0107] When using the battery structure 100 of the above embodiment to manufacture photovoltaic modules, low-temperature long-time welding can be used to fix the conductive component 130 and the battery cell 110, eliminating the need for solder ribbon protective film, reducing manufacturing costs. Moreover, the manufacturing process of photovoltaic modules is more user-friendly, and the battery string process does not require flipping, ensuring process stability, simplifying the manufacturing process of photovoltaic modules, and ensuring the reliability of photovoltaic modules.

[0108] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery structure, characterized in that, include: A battery cell (110) has multiple grid lines (111) spaced apart along a first direction on the surface of the battery cell (110) and the grid lines (111) extend along a second direction perpendicular to the first direction. The battery cell (110) forms a connection region (112) between adjacent grid lines (111). The adhesive portion (120) includes a plurality of fixing adhesive dots (121), which are spaced apart along a first direction on the surface of the battery cell (110); as well as A conductive component (130) has a plurality of first contact areas (131) and a plurality of second contact areas (132) on its surface facing the battery cell (110), and the plurality of first contact areas (131) and the plurality of second contact areas (132) are arranged alternately along the first direction; The conductive component (130) is fixed to the fixing adhesive point (121) through the first contact area (131). The fixing adhesive point (121) can electrically isolate the battery cell (110) from the conductive component (130) through the first contact area (131). The conductive component (130) is electrically in contact with the area of ​​the battery cell (110) other than the fixing adhesive point (121) through the second contact area (132), so that a non-continuous contact is formed between the conductive component (130) and the battery cell (110). Multiple adhesive dots (121) are provided in the connection area (112) and / or the grid line (111), and the conductive component (130) makes electrical contact with the grid line (111) and the connection area (112) of the battery cell (110) other than the adhesive dots (121) through the second contact area (132).

2. The battery structure according to claim 1, characterized in that, Each of the aforementioned connection areas (112) is provided with the fixing adhesive dots (121); or, The fixing adhesive dots (121) are provided in a portion of the connection area (112), at least some of the fixing adhesive dots (121) are arranged adjacent to each other, and / or, at least some of the fixing adhesive dots (121) are spaced apart by at least one connection area (112).

3. The battery structure according to claim 1, characterized in that, Each of the aforementioned grid lines (111) is provided with the fixing adhesive point (121); or, Some of the grid lines (111) are provided with the fixing adhesive dots (121), at least some of the fixing adhesive dots (121) are arranged adjacent to each other, and / or, at least some of the fixing adhesive dots (121) are spaced apart by at least one grid line (111).

4. The battery structure according to claim 1, characterized in that, The number of adhesive portions (120) is multiple, and the multiple adhesive portions (120) are spaced apart on the surface of the battery cell (110) along a second direction perpendicular to the first direction. Each adhesive portion (120) is connected to a conductive component (130).

5. The battery structure according to any one of claims 1 to 4, characterized in that, The fixing adhesive dots (121) at least partially cover the conductive component (130) circumferentially. And / or, the conductive component (130) includes a conductor (133) and a metal solder (134), the metal solder (134) covering the outside of the conductor (133), and the metal solder (134) making electrical contact with the battery cell (110) in the second contact area (132).

6. The battery structure according to any one of claims 1 to 4, characterized in that, The shape of the fixed adhesive dots (121) is hemispherical, square, straight-line splicing, curved-line splicing, or a combination of straight and curved lines; The shapes of each of the fixed adhesive dots (121) are the same and / or different.

7. The battery structure according to any one of claims 1 to 4, characterized in that, The ratio of the sum of the lengths TD1 of each of the first contact areas (131) along the first direction to the length L of the battery cell (110) is: TD1 / L≤50%; And / or, the ratio of the sum of the lengths TD1 of each of the first contact areas (131) along the first direction to the length L of the battery cell (110) is: TD1 / L≥1%.

8. The battery structure according to any one of claims 1 to 4, characterized in that, The distances between any two adjacent first contact areas (131) along the first direction are equal and / or different; And / or, the dimensions of each of the first contact areas (131) along the first direction are the same and / or different.

9. A photovoltaic module, characterized in that, It includes a battery string, a cover plate, and a back plate. The cover plate and the back plate are located on both sides of the battery string, and the cover plate, the back plate, and the battery string are encapsulated using an encapsulation process. The battery string includes a plurality of battery structures (100) as described in any one of claims 1 to 8, and the plurality of battery structures (100) are connected in series to form the battery string.

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