Battery piece and photovoltaic module

Abstract

The invention discloses a battery piece and a photovoltaic module, the battery piece comprises a battery piece body, a plurality of auxiliary grid lines, a plurality of main grid lines and a plurality of welding strips, and the plurality of auxiliary grid lines are arranged on the battery piece body at intervals; the plurality of main grid lines are arranged on one side, deviating from the battery piece body, of the auxiliary grid lines at intervals and intersect with the auxiliary grid lines; the extension directions of the multiple welding strips are the same as the extension direction of the main grid line, the welding strips are located on the sides, away from the auxiliary grid lines, of the main grid line in a one-to-one correspondence mode, each welding strip comprises a welding strip body and a bearing film wrapping the outer side of the circumferential direction of the welding strip body, and the bearing films are used for fixing the welding strip bodies to the main grid line. According to the battery piece, the welding strip is fixed to the main grid line through the bearing film, the welding strip and the main grid line do not form alloy, tearing between the welding strip and the main grid line in the transferring process of the battery piece is avoided, meanwhile, only the main grid line is arranged on the battery piece, the use amount of silver paste can be reduced, and then the cost of the battery piece can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic power generation technology, and in particular to a battery cell and a photovoltaic module. Background Art

[0002] In the related technology, in order to avoid hidden cracks in the battery cell during the turnover and movement after the battery cell string is welded, a distance is reserved between the ends of the battery cell welding and the edge. The secondary grid lines at the edges are designed to collect current in a harpoon-like manner. Each main grid line has two harpoon structures. The more main grid lines there are, the more harpoon structures there are, the more silver paste is used, and the higher the cost of the battery cell will be. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a battery cell that can reduce the amount of silver paste used while avoiding tearing between the welding strip and the main grid line, thereby reducing the cost of the battery cell.

[0004] The present invention also provides a photovoltaic module having the above-mentioned solar cell.

[0005] According to the first aspect of the present invention, the battery cell embodiment comprises: a battery cell body; a plurality of auxiliary grid lines, the plurality of the auxiliary grid lines are arranged at intervals on the battery cell body; a plurality of main grid lines, the plurality of the main grid lines are arranged at intervals on the side of the auxiliary grid lines away from the battery cell body and intersect with the auxiliary grid lines; a plurality of welding strips, the extension direction of the plurality of welding strips is the same as the extension direction of the main grid lines, the welding strips are located one by one on the side of the main grid lines away from the auxiliary grid lines, each of the welding strips comprises a welding strip body and a carrier film coated on the circumferential outer side of the welding strip body, the carrier film is used to fix the welding strip body on the main grid lines.

[0006] According to the battery cell of the embodiment of the present invention, the welding ribbon is fixed to the main grid line through the carrier film. Since the welding ribbon and the main grid line do not form an alloy, the welding ribbon and the main grid line are prevented from tearing during the transfer of the battery cell. At the same time, only the main grid line is arranged on the battery cell, which can reduce the use of silver paste and thus reduce the cost of the battery cell.

[0007] According to some embodiments of the present invention, a plurality of first auxiliary bus bars are further included, each of the first auxiliary bus bars being connected to at least one end of the corresponding bus bar.

[0008] According to some embodiments of the present invention, the device further includes a plurality of main grid lines, and the first auxiliary main grid lines are co-linear with the main grid lines.

[0009] According to some embodiments of the present invention, both ends of each of the main grid lines are connected to the first auxiliary main grid lines.

[0010] According to some embodiments of the present invention, one end of each of the main gate lines is connected to the first auxiliary main gate line, and the other end of each of the main gate lines is connected to a harpoon portion, the harpoon portion includes a second auxiliary main gate line and a third auxiliary main gate line connected to the main gate line, the second auxiliary main gate line and the third auxiliary main gate line both extend in a direction away from the main gate line, and the welding strip is located between the second auxiliary main gate line and the third auxiliary main gate line.

[0011] According to some embodiments of the present invention, an angle is formed between the second auxiliary main grid line and the third auxiliary main grid line; and / or the second auxiliary main grid line and the third auxiliary main grid line are arranged in parallel.

[0012] According to some embodiments of the present invention, a plurality of auxiliary gate lines are connected between the second auxiliary main gate line and the third auxiliary main gate line, and each of the auxiliary gate lines is connected to the corresponding sub-gate line.

[0013] According to some embodiments of the present invention, the lengths of the first auxiliary bus bar, the second auxiliary bus bar, and the third auxiliary bus bar are all L, satisfying: 4 mm ≤ L ≤ 10 mm.

[0014] According to some embodiments of the present invention, the widths of the first auxiliary bus bar line, the second auxiliary bus bar line and the third auxiliary bus bar line are all D, satisfying: 10um≤D≤60um.

[0015] A photovoltaic module according to an embodiment of a second aspect of the present invention comprises: a plurality of solar cells according to an embodiment of the first aspect of the present invention, wherein the plurality of solar cells are connected by the welding ribbon.

[0016] The photovoltaic module according to the embodiment of the present invention can reduce the amount of silver paste used by providing the above-mentioned solar cell while avoiding tearing between the welding strip and the main grid line, thereby reducing the cost of the solar cell.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic diagram of a battery cell according to some embodiments of the present invention;

[0020] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0021] Figure 3 are schematic diagrams of battery cells according to other embodiments of the present invention;

[0022] Figure 4 yes Figure 3 Enlarged view of point B in the middle.

[0023] Reference numerals:

[0024] 10. Battery cells;

[0025] 1. Battery cell body;

[0026] 2. Secondary grid line;

[0027] 31, main grid line; 32, first auxiliary main grid line; 33, harpoon part; 331, second auxiliary main grid line; 332, third auxiliary main grid line; 333, auxiliary grid line;

[0028] 4. Soldering strip. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Reference below Figure 1-Figure 4 A battery cell 10 according to an embodiment of the present invention is described.

[0033] According to the battery cell 10 of the first aspect of the present invention, the battery cell 10 includes a battery cell body 1, a plurality of secondary grid lines 2 and a plurality of main grid lines 31, wherein the plurality of secondary grid lines 2 are arranged at intervals on the battery cell body 1, and the plurality of main grid lines 31 are arranged at intervals on the side of the secondary grid lines 2 away from the battery cell body 1, and the plurality of main grid lines 3 intersect with the secondary grid lines 2. For example, the plurality of secondary grid lines 2 are arranged along a first direction (for example, the first direction) Figure 1 The main grid lines 31 extend along the second direction (for example, the direction e1 in FIG. 1 ). Figure 1 The first direction is perpendicular to the second direction, that is, the plurality of auxiliary grid lines 2 intersect the plurality of main grid lines 3 perpendicularly.

[0034] For example, under the premise that the area of ​​a battery cell body 1 is determined, the different intervals between two adjacent secondary grid lines 2 will result in different numbers of secondary grid lines 2 arranged on the battery cell body 1; 156 secondary grid lines 2, 182 secondary grid lines 2 or 210 secondary grid lines 2, etc. can be arranged on a battery cell body 1.

[0035] The cell 10 further includes a plurality of welding strips 4, the extension direction of the plurality of welding strips 4 is the same as the extension direction of the main grid line 31, the welding strips 4 are located one by one on the side of the main grid line 3 away from the auxiliary grid line 2, and the welding strips 4 are used to connect two adjacent cell pieces 10 to form a cell string. For example, the plurality of welding strips 4 are all along the second direction (for example, the auxiliary grid line 2). Figure 1 The first direction is perpendicular to the second direction, that is, the plurality of secondary grid lines 2 intersect the plurality of welding strips 4 perpendicularly.

[0036] The battery cell body 1 can generate current under the sun's irradiation. The multiple secondary grid lines 2 are used to collect the current on the battery cell body 1, and then collect the current to the multiple main grid lines 31, and finally collect the current to the welding strip 4, through which the current on multiple battery cell bodies 1 is collected.

[0037] In the related art, after the welding strip 4 is welded to the main grid line 31 and then transferred, it will cause tearing between the welding strip 4 and the main grid line 31, so harpoon parts 33 are set at both ends of the battery cell body 1, the harpoon parts 33 are connected to the main grid line 31, and the welding strip 4 is located between the harpoon parts 33, which avoids the welding strip 4 and the main grid line 31 from tearing during the transfer process. However, this creates a new problem. The harpoon parts 33 are set at both ends of the main grid line 31, and the harpoon parts 33 are printed with silver paste. This will result in a large amount of silver paste used, thereby increasing the cost of the battery cell 10.

[0038] Therefore, the present application proposes a carrier film, the welding strip 4 includes a carrier film, each carrier film is located one by one on the outer periphery of the welding strip body, and is used to fix the welding strip body to the main grid line 31. The carrier film can be covered with adhesive, and the welding strip body can be fixed to the main grid line 31 through the carrier film. The welding strip 4 is fixed to the main grid line 31 through a coating technology, and the welding strip 4 is pre-fixed on the main grid line 31 by using a carrier film, and then the welding strip 4 and the main grid line 31 are welded in a laminator. Before lamination, the welding strip 4 and the main grid line 31 are not alloyed, and hidden cracks will not occur during the turnover process due to the pulling of the welding strip 4 and the main grid line 31. The harpoon portion 33 is not provided at both ends of the battery cell body 1, which can reduce the cost of the battery cell 10.

[0039] According to the battery cell 10 of the embodiment of the present invention, the welding ribbon 4 is fixed to the main grid line 31 through a carrier film. Since the welding ribbon 4 and the main grid line 31 do not form an alloy, tearing between the welding ribbon 4 and the main grid line 31 is avoided during the transfer of the battery cell 10. At the same time, only the main grid line 3 is set on the battery cell 10, which can reduce the use of silver paste and thus reduce the cost of the battery cell 10.

[0040] According to some embodiments of the present invention, referring to Figure 1-Figure 2 The battery cell 10 also includes a plurality of first auxiliary main grid lines 32, each of which is connected to at least one end of the corresponding main grid line 31. The first auxiliary main grid line 32 may be provided at one end of the main grid line 31, or may be provided at both ends of the main grid line 31. The first auxiliary main grid line 32 may reduce the cost of the battery cell 10 on the basis of collecting the current of the secondary grid line 2.

[0041] The battery cell body 1 can generate current under the sunlight. Multiple secondary grid lines 2 are used to collect the current on the battery cell body 1, and then collect the current to the first auxiliary main grid line 32, and finally collect it to the welding strip 4, so that the current on multiple battery cell bodies 1 can be collected through the welding strip 4.

[0042] According to some embodiments of the present invention, referring to Figure 1-Figure 2The first auxiliary main grid line 32 is colinear with the main grid line 31, that is, the first auxiliary main grid line 32 and the main grid line 31 both extend along the second direction, the first auxiliary main grid line 32 can be understood as an extension of the main grid line 31, the extension direction of the first auxiliary main grid line 32 is the same as the extension direction of the welding strip 4, and multiple first auxiliary main grid lines 32 intersect multiple secondary grid lines 2 vertically. The first auxiliary main grid lines 32 correspond to the welding strips 4 one by one, and the welding strip 4 located at at least one end of the battery cell body 1 is fixed to the first auxiliary main grid line 32, which can increase the reliability of the fixing of the welding strip 4 to the battery cell body 1, and further avoid the problem of tearing between the welding strip 4 and the battery cell body 1.

[0043] According to some embodiments of the present invention, referring to Figure 1-Figure 2 Both ends of each main grid line 31 are connected to a first auxiliary main grid line 32 . The first auxiliary main grid lines 32 at both ends of the main grid line 31 can be understood as extensions of both ends of the main grid line 31 in order to collect the current of the secondary grid line 2 at the edge of the battery cell 10 .

[0044] For example, each cell 10 has 24 main grid lines 31 , and both ends of the main grid lines 31 are connected to the first auxiliary main grid lines 32 . Each cell 10 can reduce 4 mg of silver paste.

[0045] According to some embodiments of the present invention, referring to Figure 3-Figure 4 One end of each main grid line 31 is connected to a first auxiliary main grid line 32, and the other end of each main grid line 31 is connected to a harpoon portion 33, the harpoon portion 33 includes a second auxiliary main grid line 331 and a third auxiliary main grid line 332 connected to the main grid line 31, the second auxiliary main grid line 331 and the third auxiliary main grid line 332 both extend in a direction away from the main grid line 31, and the welding strip 4 is located between the second auxiliary main grid line 331 and the third auxiliary main grid line 332.

[0046] The second auxiliary main grid line 331 and the third auxiliary main grid line 332 are used to collect the current of the auxiliary grid line 2 at the edge of the battery cell 10. At the same time, the welding strip 4 is located between the second auxiliary main grid line 331 and the third auxiliary main grid line 332, which can further avoid the welding strip 4 and the battery cell 10 from tearing during the transfer of the battery cell.

[0047] For example, each cell 10 has 24 main grid lines 31 , one end of each main grid line 31 is connected to a first auxiliary main grid line 32 , and the other end has a harpoon portion 33 , so that each cell 10 can reduce 2.5 mg of silver paste.

[0048] According to some embodiments of the present invention, referring to Figure 3-Figure 4There is an angle between the second auxiliary main grid line 331 and the third auxiliary main grid line 332. The second auxiliary main grid line 331 and the third auxiliary main grid line 332 are acute angles, which can be 30°, 45° or 75°, etc. The welding strip 4 is located at the angle between the second auxiliary main grid line 331 and the third auxiliary main grid line 332.

[0049] For example, when the angle between the second auxiliary main grid line 331 and the third auxiliary main grid line 332 is 30°, the angle between the second auxiliary main grid line 331 and the third auxiliary main grid line 332 is small, so as to avoid the second auxiliary main grid line 331 and the third auxiliary main grid line 332 from interfering with the adjacent second auxiliary main grid line 331 and the third auxiliary main grid line 332. When the angle between the second auxiliary main grid line 331 and the third auxiliary main grid line 332 is 45°, the angle between the second auxiliary main grid line 331 and the third auxiliary main grid line 332 is appropriate, that is, the angle between the second auxiliary main grid line 331 and the third auxiliary main grid line 332 will not interfere with the adjacent second auxiliary main grid line 331 and the third auxiliary main grid line 332, and more current can be collected. When the angle between the second auxiliary main grid line 331 and the third auxiliary main grid line 332 is 75°, the second auxiliary main grid line 331 and the third auxiliary main grid line 332 can collect more current.

[0050] The second auxiliary main grid line 331 and the third auxiliary main grid line 332 are arranged in parallel, and the welding strip 4 is located between the second auxiliary main grid line 331 and the third auxiliary main grid line 332. A first auxiliary grid line and a second auxiliary grid line are respectively arranged at one end of the second auxiliary main grid line 331 and the third auxiliary main grid line 332 facing the main grid line 31, the first auxiliary grid line is used to connect the second auxiliary main grid line 331 with the main grid line 31, and the second auxiliary grid line is used to connect the second auxiliary main grid line 331 with the main grid line 31, so as to collect the current of the auxiliary grid line 2 at the edge of the collection cell 10 to the main grid line 31.

[0051] According to some embodiments of the present invention, referring to Figure 3-Figure 4 There are multiple auxiliary grid lines 333 connected between the second auxiliary main grid line 331 and the third auxiliary main grid line 332, each auxiliary grid line 333 is connected to the corresponding sub-grid line 2, and the auxiliary grid line 333 is used to collect the current at the edge of the battery cell body 1 to the auxiliary grid line 333, and converge it to the second auxiliary main grid line 331 and the third auxiliary main grid line 332.

[0052] According to some embodiments of the present invention, referring to Figure 1-Figure 4The lengths of the first auxiliary main grid line 32, the second auxiliary main grid line 331 and the third auxiliary main grid line 332 are all L, satisfying: 4mm≤L≤10mm. The lengths of the first auxiliary main grid line 32, the second auxiliary main grid line 331 and the third auxiliary main grid line 332 are controlled within this range, which can meet the current collection requirements of the first auxiliary main grid line 32, the second auxiliary main grid line 331 and the third auxiliary main grid line 332, and can also reduce the use of silver paste, thereby reducing the cost of the battery cell 10.

[0053] For example, the lengths of the first auxiliary bus bars 32 , the second auxiliary bus bars 331 , and the third auxiliary bus bars 332 may be 4 mm, 5 mm, 7 mm, 9 mm, or 10 mm.

[0054] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The widths of the first auxiliary main grid line 32, the second auxiliary main grid line 331 and the third auxiliary main grid line 332 are all D, satisfying: 10um≤D≤60um. The widths of the first auxiliary main grid line 32, the second auxiliary main grid line 331 and the third auxiliary main grid line 332 are controlled within this range, which can satisfy the overflow of the current collected by the first auxiliary main grid line 32, the second auxiliary main grid line 331 and the third auxiliary main grid line 332 at the edge of the battery cell 10.

[0055] For example, the widths of the first auxiliary bus bars 32 , the second auxiliary bus bars 331 and the third auxiliary bus bars 332 may be 10 um, 30 um, 40 um, 50 um or 60 um.

[0056] The photovoltaic module according to the second embodiment of the present invention comprises: a plurality of solar cells 10 according to the first embodiment of the present invention, wherein the plurality of solar cells 10 are connected by welding strips 4 .

[0057] According to the photovoltaic module of the embodiment of the present invention, by providing the above-mentioned solar cell 10, the amount of silver paste used can be reduced while avoiding tearing between the welding ribbon 4 and the main grid line 3, thereby reducing the cost of the solar cell 10.

[0058] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0059] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: Battery cell body; A plurality of secondary grid lines, wherein the plurality of secondary grid lines are arranged at intervals on the battery cell body; A plurality of main grid lines, wherein the plurality of main grid lines are arranged at intervals on a side of the secondary grid lines away from the battery cell body and intersect with the secondary grid lines; A plurality of welding strips, the extension direction of the plurality of welding strips is the same as the extension direction of the main grid line, the welding strips are located one by one on the side of the main grid line away from the auxiliary grid line, each welding strip comprises a welding strip body and a carrier film coated on the circumferential outer side of the welding strip body, and the carrier film is used to fix the welding strip body on the main grid line.

2. The battery cell according to claim 1, characterized in that: It also includes a plurality of first auxiliary main grid lines, each of which is connected to at least one end of the corresponding main grid line.

3. The battery cell according to claim 2, characterized in that: The first auxiliary main grid line is colinear with the main grid line.

4. The battery cell according to claim 3, characterized in that: Both ends of each of the main grid lines are connected to the first auxiliary main grid lines.

5. The battery cell according to claim 3, characterized in that: One end of each of the main grid lines is connected to the first auxiliary main grid line, and the other end of each of the main grid lines is connected to a harpoon portion, the harpoon portion includes a second auxiliary main grid line and a third auxiliary main grid line connected to the main grid line, the second auxiliary main grid line and the third auxiliary main grid line both extend in a direction away from the main grid line, and the welding strip is located between the second auxiliary main grid line and the third auxiliary main grid line.

6. The battery cell according to claim 5, characterized in that: There is an included angle between the second auxiliary main grid line and the third auxiliary main grid line; and / or, the second auxiliary main grid line and the third auxiliary main grid line are arranged in parallel.

7. The battery cell according to claim 6, characterized in that: A plurality of auxiliary gate lines are connected between the second auxiliary main gate line and the third auxiliary main gate line, and each of the auxiliary gate lines is connected to the corresponding sub-gate line.

8. The battery cell according to claim 5, characterized in that: The lengths of the first auxiliary bus bar, the second auxiliary bus bar and the third auxiliary bus bar are all L, satisfying: 4 mm≤L≤10 mm.

9. The battery cell according to claim 5, characterized in that: The widths of the first auxiliary main grid line, the second auxiliary main grid line and the third auxiliary main grid line are all D, satisfying: 10um≤D≤60um.

10. A photovoltaic module, characterized in that: include: A plurality of battery cells according to any one of claims 1 to 9, wherein the plurality of battery cells are connected by the welding ribbon.

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