Battery cell, solar cell, and photovoltaic module

Abstract

A battery cell, a solar cell, and a photovoltaic module. The front surface of the battery cell is provided with a plurality of front surface connecting stations distributed at intervals in a first direction, each front surface connecting station is provided with a plurality of first connecting parts distributed at intervals in a second direction, the back surface of the battery cell is provided with a plurality of back surface connecting stations distributed at intervals in the first direction, each back surface connecting station is provided with a plurality of second connecting parts distributed at intervals in the second direction, the plurality of first connecting parts of every two adjacent front surface connecting stations are distributed in a staggered manner, and / or the plurality of second connecting parts of every two adjacent back surface connecting stations are distributed in a staggered manner. The battery can reduce the reliability failure risk of the photovoltaic module.

Description

Solar cells, photovoltaic modules

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 3, 2023, with application number 2023114667344 and invention name “Battery Cells, Solar Cells and Photovoltaic Modules”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of photovoltaic technology, and in particular to a cell, a solar cell and a photovoltaic module. Background Art

[0003] In the photovoltaic field, when manufacturing solar cells, such as those without busbars or with thin busbars, glue is printed on the cell. A lamination process is then used to tightly press the metal interconnects to the cell. After the glue cures, the metal interconnects are bonded to the cell. Traditionally, glue dot printing is performed in a flush array format, with the glue dots printed on each busbar on the cell positioned identically, with the front and back glue dots positioned correspondingly. The metal interconnects are then placed on the glue dots, and pressed together using a pressure needle or plate to solidify the glue dots. Because the glue dots on the front and back of the cell correspond, hidden cracks in the cell can easily occur during the curing and lamination processes. Furthermore, due to the varying heights of the glue dots and uneven pressing pressure, some of the fine grids on the cell cannot effectively contact the metal interconnects, leading to a false connection and, consequently, an EL test shadow. The EL test shadow is typically the width of two to three fine grids, impacting the power of the photovoltaic module and carrying the risk of reliability failure and hidden cracks.

[0004] Application Contents

[0005] Based on this, it is necessary to provide a cell. The cell of the present application can effectively optimize the problem of virtual connection, reduce the power reduction caused by virtual connection, reduce the risk of reliability failure of photovoltaic modules, and effectively control the problem of hidden cracks in the cell, reduce cell loss, and reduce the degradation rate of photovoltaic modules.

[0006] An embodiment of the present application provides a battery cell.

[0007] A battery cell, wherein a front side of the battery cell is provided with a plurality of front connection stations, the plurality of front connection stations are spaced apart along a first direction formed from one side of the battery cell to an opposite side, and each of the front connection stations has a plurality of first connection portions spaced apart along a second direction; and a back side of the battery cell is provided with a plurality of back side connection stations, the plurality of back side connection stations are spaced apart along the first direction, and each of the back side connection stations has a plurality of second connection portions spaced apart along the second direction;

[0008] The plurality of first connection portions of two adjacent front connection stations are staggered, and / or the plurality of second connection portions of two adjacent back connection stations are staggered.

[0009] In some embodiments, the second direction is an extending direction of the metal interconnection strip, and the first direction is perpendicular to the second direction.

[0010] In some embodiments, a plurality of the front connection stations correspond one-to-one to a plurality of the back connection stations along the first direction, a plurality of the first connection parts constitute a first connection member, a plurality of the second connection parts constitute a second connection member, and at least one group of corresponding first connection members on the front connection station and the second connection members on the back connection station are staggered along the second direction in the thickness direction of the battery cell.

[0011] In some embodiments, the first connection portion is formed by printing, coating, or dispensing.

[0012] In some embodiments, the second connection portion is formed by printing, coating, or dispensing.

[0013] In some embodiments, the first connecting portion is in a point shape, a segment shape, or a combination of a point shape and a segment shape.

[0014] In some embodiments, the second connecting portion is in a point shape, a segment shape, or a combination of a point shape and a segment shape.

[0015] In some embodiments, the distances between two adjacent front connection stations are equal.

[0016] In some embodiments, the distances between two adjacent back connection stations are equal.

[0017] In some embodiments, the distance between two adjacent front connection stations is equal to the distance between two adjacent back connection stations.

[0018] In some embodiments, the distances between two adjacent first connection parts at the front connection station are equal.

[0019] In some embodiments, the distances between two adjacent second connection parts at the back connection station are equal.

[0020] In some embodiments, a distance between two adjacent first connection portions is equal to a distance between two adjacent second connection portions.

[0021] An embodiment of the present application also provides a solar cell.

[0022] A solar cell comprises a metal interconnection bar, an adhesive, and a plurality of battery cells, wherein the plurality of battery cells are distributed sequentially, and two adjacent battery cells are connected by a plurality of the metal interconnection bars, the adhesive is provided on a plurality of the first connection parts at the front connection station on the battery cell, and the adhesive is provided on a plurality of the second connection parts at the back connection station on the battery cell, a portion of the metal interconnection bar is connected to the adhesive at the front connection station of one of the two adjacent battery cells, and another portion of the metal interconnection bar is connected to the adhesive at the back connection station of the other of the two adjacent battery cells.

[0023] An embodiment of the present application also provides a photovoltaic module.

[0024] A photovoltaic assembly comprises the solar cell.

[0025] The above-mentioned cells can effectively optimize the problem of virtual connection, reduce the power reduction caused by virtual connection, reduce the risk of reliability failure of photovoltaic modules, and effectively control the problem of hidden cracks in cells, reduce cell losses, and reduce the degradation rate of photovoltaic modules. Specifically, this application changes the position of glue dots on adjacent main grids and adopts staggered printing of glue dots on the front and back of cells to reduce EL test shadows, avoid abnormal power of photovoltaic modules, and at the same time increase the reliability of photovoltaic modules. This application changes the position of glue dots on the front and back of cells to achieve effective combination of metal interconnects and glue dots, avoid virtual connection, improve the problem of hidden cracks in cells during the manufacturing process, and reduce the degradation rate of photovoltaic modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0027] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0028] FIG1 is a schematic diagram of a battery cell according to an embodiment of the present application;

[0029] FIG2 is a side view of a battery cell according to an embodiment of the present application;

[0030] FIG3 is a schematic diagram of a partial structure of the battery cell shown in FIG1 .

[0031] DESCRIPTION OF REFERENCE NUMERALS 10, battery cell; 100, front connection station; 101, first connection portion; 200, back connection station; 201, second connection portion. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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, and therefore should not be understood as a limitation on the present application.

[0034] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0035] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to be exclusive of the number indicated, while "above," "below," and "within" are understood to be inclusive of the number indicated. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the indicated technical features.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] The present invention provides a cell 10 to address at least one of the following issues: the problem of identical glue dot printing locations on the front and back of the cell 10, which can easily lead to hidden cracks in the cell 10 during the curing and lamination processes; and the problem of inconsistent glue dot heights and uneven pressing pressure, which can cause a portion of the fine grid on the cell 10 to lose effective contact with the metal interconnects, leading to a false connection and resulting in EL test shadowing, which can affect the power of the photovoltaic module and pose a risk of reliability failure. The cell 10 will be described below with reference to the accompanying drawings.

[0039] The cell 10 provided in the embodiment of the present application is exemplified in FIG1 , which is a schematic structural diagram of the cell 10 provided in the embodiment of the present application. The cell 10 of the present application can be used for the production and preparation of solar cells in the photovoltaic field.

[0040] In order to more clearly illustrate the structure of the battery cell 10 , the battery cell 10 will be introduced below with reference to the accompanying drawings.

[0041] For example, referring to FIG. 1 , a battery cell 10 is shown. The front surface of the battery cell 10 is provided with multiple front connection stations 100. The front connection stations 100 are shown in the dashed boxes in FIG. 1 and FIG. 2 , with only a portion of the front connection stations 100 shown in FIG. The multiple front connection stations 100 are spaced apart along a first direction extending from one side of the battery cell 10 to the opposite side. Each front connection station 100 has multiple first connection portions 101 spaced apart along a second direction.

[0042] The back side of the cell 10 is provided with multiple back-side connection stations 200. See the dotted-line area in FIG2 , where only a portion of the back-side connection stations 200 is shown. The multiple back-side connection stations 200 are spaced apart along the first direction. Each back-side connection station 200 has multiple second connection portions 201 spaced apart along the second direction.

[0043] The first connection parts 101 of two adjacent front connection stations 100 are staggered. The second connection parts 201 of two adjacent back connection stations 200 are staggered.

[0044] The above-mentioned cell 10 can effectively optimize the problem of virtual connection, reduce the power reduction caused by virtual connection, reduce the risk of reliability failure of photovoltaic modules, and effectively control the problem of hidden cracks in the cell 10, reduce the loss of the cell 10, and reduce the degradation rate of photovoltaic modules.

[0045] In some embodiments, the second direction is the extending direction of the metal interconnection bar, and the first direction is perpendicular to the second direction. For example, as shown in FIG1 , the first direction may be the length direction of the battery cell 10 , and the second direction may be the width direction of the battery cell 10 .

[0046] In some embodiments, as shown in FIG2 , a plurality of front connection stations 100 correspond one-to-one with a plurality of back connection stations 200 along a first direction, a plurality of first connection portions 101 constitute a first connection member, a plurality of second connection portions 201 constitute a second connection member, and at least one group of first connection members on the front connection stations 100 and second connection members on the back connection stations 200 are staggered along a second direction in the thickness direction of the battery cell 10. Preferably, the first connection members on each group of corresponding front connection stations 100 and second connection members on the back connection stations 200 are staggered along the second direction in the thickness direction of the battery cell 10.

[0047] In some embodiments, the first connection portion 101 is formed by printing, coating, or dispensing.

[0048] In some embodiments, the second connection portion 201 is formed by printing, coating, or dispensing.

[0049] In some embodiments, there are multiple front connection stations 100 , for example, two, three, four, five, etc. The number of the front connection stations 100 can be adjusted according to the size of the battery cell 10 .

[0050] In some embodiments, the number of the front connection stations 100 is equal to the number of the back connection stations 200. The number of the back connection stations 200 and the number of the front connection stations 100 can be adapted to achieve a one-to-one correspondence.

[0051] In some embodiments, the number of the first connecting portions 101 on the front connecting station 100 is multiple, for example, the number of the first connecting portions 101 on the front connecting station 100 is two, three, four, five, etc.

[0052] In some embodiments, the number of the second connection parts 201 on the back connection station 200 is multiple, for example, the number of the second connection parts 201 on the back connection station 200 is two, three, four, five, etc.

[0053] In some embodiments, as shown in FIG. 2 , along the first direction, the first front connection station 100 is aligned with the first back connection station 200 , and the last front connection station 100 is aligned with the last back connection station 200 .

[0054] In some embodiments, as shown in FIG2 , along the first direction, the other multiple front connection stations 100 between the first front connection station 100 and the last front connection station 100 and the other multiple front connection stations 100 between the first back connection station 200 and the last back connection station 200 are staggered.

[0055] For example, in one embodiment, as shown in FIG2 , the number of front connection stations 100 and the number of back connection stations 200 are both 18. The first front connection station 100 is aligned with the first back connection station 200, and the eighteenth front connection station 100 is aligned with the eighteenth back connection station 200. The second to seventeenth front connection stations 100 are offset from the second to seventeenth back connection stations 200, respectively.

[0056] In some embodiments, as shown in FIG2 , the distance between two adjacent front connection stations 100 is equal. The distance between two adjacent front connection stations 100 can be set according to actual needs.

[0057] In some embodiments, as shown in FIG2 , the distance between two adjacent back surface connection stations 200 is equal. The distance between two adjacent back surface connection stations 200 can be set according to actual needs.

[0058] In some embodiments, the distance between two adjacent front connection stations 100 is equal to the distance between two adjacent back connection stations 200. This arrangement facilitates the design of the corresponding distribution of pressing plates and pressing pins in the printing and pressing processes.

[0059] For example, in one specific embodiment, as shown in FIG2 , the number of front connection stations 100 and the number of back connection stations 200 are both eighteen. The first front connection station 100 is aligned with the first back connection station 200, and the eighteenth front connection station 100 is aligned with the eighteenth back connection station 200. The second through seventeenth front connection stations 100 are offset from the second through seventeenth back connection stations 200, respectively. The spacing between adjacent front connection stations 100 and the spacing between adjacent back connection stations 200 are equal. Since the second through seventeenth front connection stations 100 are offset from the second through seventeenth back connection stations 200, respectively, the spacing H1 between adjacent front connection stations 100 and the spacing H1 between adjacent back connection stations 200 are equal. However, the spacing H2 between the sixteenth and seventeenth back connection stations 200 is different. As shown in FIG2 , the spacing H2 between the sixteenth and seventeenth back connection stations 200 serves as offset compensation.

[0060] In some embodiments, the first connecting portion 101 may be in a dot-shaped, segment-shaped, or a combination of dot-shaped and segment-shaped shapes. The dot-shaped and segment-shaped combination may be configured in a specific combination as needed. When the first connecting portion 101 is in a segment-shaped shape, its length may be configured as needed.

[0061] In some embodiments, the second connecting portion 201 may be in a dot-shaped, segment-shaped, or a combination of dot-shaped and segment-shaped shapes. The dot-shaped and segment-shaped combination may be configured in a specific combination as needed. When the second connecting portion 201 is in a segment-shaped shape, its length may be configured as needed.

[0062] 1 , the first connection portion 101 shown in FIG1 is in a dot shape. Preferably, the second connection portion 201 is in a dot shape.

[0063] In some embodiments, as shown in FIG. 1 and FIG. 3 , the distances between two adjacent first connection portions 101 on the front connection station 100 are equal.

[0064] In some embodiments, the distances between two adjacent second connection portions 201 on the back connection station 200 are equal.

[0065] In some embodiments, the distance between two adjacent first connection portions 101 is equal to the distance between two adjacent second connection portions 201 .

[0066] In some embodiments, the height of the first connection portion 101 can be set according to actual needs. For example, the height of the first connection portion 101 is 0.1 mm to 10 mm.

[0067] In some embodiments, the height of the second connection portion 201 can be set according to actual needs. For example, the height of the second connection portion 201 is 0.1 mm to 10 mm.

[0068] In some embodiments, when the spacing between two adjacent first connection portions 101 at each front connection station 100 is equal, the spacing in the second direction between the first connection portion 101 at one of the two adjacent front connection stations 100 and the staggered first connection portions 101 at the two adjacent front connection stations 100 is equal to half the spacing between the two adjacent first connection portions 101. It is understood that in other embodiments, the staggered distribution distance of the multiple first connection portions 101 at two adjacent front connection stations 100 can be set as needed.

[0069] An embodiment of the present application also provides a solar cell.

[0070] A solar cell includes a metal interconnection bar, an adhesive, and a plurality of cells 10. The plurality of cells 10 are distributed sequentially. Two adjacent cells 10 are connected by a plurality of metal interconnection bars. An adhesive is provided on a plurality of first connection portions 101 on a front connection station 100 on a cell 10. An adhesive is provided on a plurality of second connection portions 201 on a back connection station 200 on a cell 10. A portion of the metal interconnection bar is connected to the adhesive on the front connection station 100 of one of the adjacent cells 10. Another portion of the metal interconnection bar is connected to the adhesive on the back connection station 200 of another adjacent cell 10.

[0071] In some embodiments, when the solar cell is a busbarless cell or a thin busbar cell, the metal interconnection bar is electrically connected to the thin grid or thin busbar on the front or back side of the solar cell 10 .

[0072] In some embodiments, the solar cell further comprises a front panel, a front film, a back panel, and a back film. The front panel, the front film, the back film, and the back panel are stacked in sequence, with a plurality of cells 10 stacked between the front film and the back film. The front panel may be a front glass panel, and the back panel may be a back glass panel.

[0073] In some embodiments, the adhesive member may be in the form of glue dots, tape, or other forms.

[0074] An embodiment of the present application also provides a photovoltaic module.

[0075] A photovoltaic module includes solar cells.

[0076] In some embodiments, the photovoltaic module further includes an encapsulation frame. The solar cells are encapsulated by the encapsulation frame. The number of encapsulation frames can be one or more. The length of the encapsulation frame can be set according to actual needs.

[0077] To sum up, the present application changes the position of the glue dots on the adjacent main grids and adopts staggered printing of glue dots on the front and back sides of the cell 10 to reduce the EL test shadow and avoid abnormal power of the photovoltaic module, while increasing the reliability of the photovoltaic module. The present application changes the position of the glue dots on the front and back sides of the cell 10 to achieve effective combination of the metal interconnection strips and the glue dots, avoid virtual connections, improve the problem of hidden cracks in the cell 10 during the manufacturing process, and reduce the degradation ratio of the photovoltaic module.

[0078] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0080] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A battery cell (10), wherein a front side of the battery cell (10) is provided with a plurality of front connection stations (100), the plurality of front connection stations (100) are spaced apart along a first direction formed from one side of the battery cell (10) to the other opposite side, and each of the front connection stations (100) has a plurality of first connection portions (101) spaced apart along a second direction; a back side of the battery cell (10) is provided with a plurality of back side connection stations (200), the plurality of back side connection stations (200) are spaced apart along the first direction, and each of the back side connection stations (200) has a plurality of second connection portions (201) spaced apart along the second direction; The plurality of first connection parts (101) of the adjacent front connection stations (100) are staggered; and / or the plurality of second connection parts (201) of the two adjacent back connection stations (200) are staggered.

2. The battery cell (10) according to claim 1, wherein the second direction is an extension direction of the metal interconnection strip, and the first direction is perpendicular to the second direction.

3. According to the battery cell (10) according to claim 1, a plurality of the front connection stations (100) correspond one-to-one with a plurality of the back connection stations (200) along the first direction, a plurality of the first connection parts (101) constitute a first connection member, a plurality of the second connection parts (201) constitute a second connection member, and at least one group of corresponding first connection members on the front connection station (100) and the second connection members on the back connection station (200) are staggered along the second direction in the thickness direction of the battery cell (10).

4. The battery cell (10) according to claim 1, wherein the first connection portion (101) is formed by printing, coating or dispensing.

5. The battery cell (10) according to claim 1, wherein the second connection portion (201) is formed by printing, coating or dispensing.

6. The battery cell (10) according to claim 1, wherein the first connecting portion (101) is in a dot shape, a segment shape, or a combination of a dot shape and a segment shape.

7. The battery cell (10) according to claim 1, wherein the second connecting portion (201) is in a dot shape, a segment shape, or a combination of a dot shape and a segment shape.

8. The battery cell (10) according to any one of claims 1 to 7, wherein the distances between two adjacent front connection stations (100) are equal.

9. The battery cell (10) according to any one of claims 1 to 7, wherein the distances between two adjacent back-side connection stations (200) are equal.

10. According to any one of claims 1 to 7, the battery cell (10) is configured such that a distance between two adjacent front connection stations (100) is equal to a distance between two adjacent back connection stations (200).

11. The battery cell (10) according to any one of claims 1 to 7, wherein the distances between two adjacent first connection portions (101) on the front connection station (100) are equal.

12. The battery cell (10) according to any one of claims 1 to 7, wherein the distances between two adjacent second connection parts (201) on the back connection station (200) are equal.

13. The battery cell (10) according to any one of claims 1 to 7, wherein a distance between two adjacent first connecting portions (101) is equal to a distance between two adjacent second connecting portions (201).

14. A solar cell, comprising a metal interconnection strip, an adhesive and a plurality of battery cells (10) according to any one of claims 1 to 13, wherein the plurality of battery cells (10) are distributed in sequence, and two adjacent battery cells (10) are connected by a plurality of the metal interconnection strips, respectively; the adhesive is provided on a plurality of the first connection parts (101) on the front connection station (100) on the battery cell (10), and the adhesive is provided on a plurality of the second connection parts (201) on the back connection station (200) on the battery cell (10); a portion of the metal interconnection strip is connected to the adhesive on the front connection station (100) of one of the two adjacent battery cells (10), and another portion of the metal interconnection strip is connected to the adhesive on the back connection station (200) of the other of the two adjacent battery cells (10).

15. A photovoltaic module comprising the solar cell according to claim 14.

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