CN217641366U

CN217641366U - Photovoltaic module

Info

Publication number: CN217641366U
Application number: CN202221715516.0U
Authority: CN
Inventors: 黄世亮; 郭志球; 关迎利; 杨敬国
Original assignee: Zhejiang Jinko Solar Co Ltd; Jinko Solar Haining Co Ltd
Current assignee: Zhejiang Jinko Solar Co Ltd; Jinko Solar Haining Co Ltd
Priority date: 2022-06-29
Filing date: 2022-06-29
Publication date: 2022-10-21
Anticipated expiration: 2032-06-29

Abstract

The application provides a photovoltaic module, which comprises at least one battery string formed by a plurality of battery pieces, a plurality of sections of first welding strips and second welding strips. The back of the battery piece is provided with a positive electrode main electrode, a positive electrode auxiliary electrode, a negative electrode main electrode and a negative electrode auxiliary electrode, wherein the positive electrode main electrode is in orthogonal connection with the positive electrode auxiliary electrode, and the negative electrode main electrode is in orthogonal connection with the negative electrode auxiliary electrode; the positive electrode main electrode and the negative electrode main electrode respectively comprise transport main electrodes and bus main electrodes which are alternately distributed. The multiple sections of first welding strips are respectively welded on the current collecting main electrodes of the positive electrode main electrode and the negative electrode main electrode. Two ends of the second welding strip are respectively connected with the positive electrode and the negative electrode of the two battery pieces, a preset distance is kept between every two adjacent battery pieces, and the length of the second welding strip is larger than or equal to 2 times of the distance. The application provides a photovoltaic module welds respectively on the main electrode of multistage confluence through adopting the multistage solder strip to can disperse welding stress, reduce the warpage degree of back of the body contact battery.

Description

Photovoltaic module

Technical Field

The application relates to the photovoltaic field, especially relates to a photovoltaic module.

Background

The back contact battery has the advantages that the positive electrode and the negative electrode are arranged on the back face of the battery, welding stress cannot be the same as that of a conventional battery after the whole welding strip is welded, the welding stress can be counteracted by welding on the front face and the back face of the battery, the back contact battery is prone to warping due to the fact that the stress cannot be counteracted, poor phenomena such as hidden cracks and fragments of the back contact battery in subsequent processes are prone to be caused due to the warping problem of the back contact battery, the yield of a back contact battery assembly is seriously influenced, and manufacturing cost is increased.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a photovoltaic module to there is welding stress and takes place the warpage problem among the solution prior art back contact battery because of adopting whole solder strip welding back.

The application provides a photovoltaic module, wherein, include:

the battery string comprises a plurality of battery pieces, the back surfaces of the battery pieces are provided with a positive electrode, a positive electrode auxiliary electrode, a negative electrode main electrode and a negative electrode auxiliary electrode, the positive electrode main electrode is orthogonally connected with the positive electrode auxiliary electrode, the negative electrode main electrode is orthogonally connected with the negative electrode auxiliary electrode, and the positive electrode main electrode and the negative electrode main electrode are alternately arranged at intervals; the positive electrode main electrode and the negative electrode main electrode respectively comprise a transporting main electrode and a converging main electrode, and the transporting main electrode and the converging main electrode are alternately connected along the extension direction of the positive electrode main electrode and the negative electrode main electrode;

the first welding strips are welded to a bus main electrode of the positive electrode main electrode and a bus main electrode of the negative electrode main electrode respectively;

one end of the second welding strip is connected to a converging main electrode of a positive electrode of one battery piece, the other end of the second welding strip is connected to a converging main electrode of a negative electrode of the other battery piece, a gap is kept between every two adjacent battery pieces, and the length of the second welding strip is larger than or equal to 2 times of the width of the gap.

In one possible design, the width of the gap between two adjacent battery pieces is 0.8-2 mm, and the length of the second welding strip is 1.6-6 mm.

In one possible embodiment, the ratio between the length of the first solder strip and the length of the second solder strip is in the range from 1.5 to 3.

In one possible design, in a direction perpendicular to the extending direction of the positive main electrode and the negative main electrode, a projection of the bus main electrode of the positive main electrode and a projection of the bus main electrode of the negative main electrode coincide, and a projection of the transport main electrode of the positive main electrode and a projection of the transport main electrode of the negative main electrode coincide.

In a possible design, the first solder strip is welded and fixed to the bus main electrode far away from the edge of the battery piece, and the second solder strip is welded and fixed to the bus main electrode near the edge of the battery piece.

In one possible design, in a direction perpendicular to the extending direction of the positive main electrode and the negative main electrode, the cross-sectional area S1 of the transport main electrode and the cross-sectional area S2 of the first solder ribbon satisfy: s1= (1.21 to 1.82) xs 2.

In one possible design, the width of the transport main electrode is larger than the width of the bus main electrode.

In one possible embodiment, the bus main electrodes have a width of 20 to 100 μm.

In one possible design, the length of the transport main electrode is smaller than the length of the bus main electrode.

In one possible design, the positive electrode auxiliary electrode is spaced apart from the adjacent negative electrode main electrode by a distance;

and a distance is reserved between the negative electrode auxiliary electrode and the adjacent positive electrode main electrode.

In one possible design, the first solder strip and/or the second solder strip are at least partially soldered to the transport main electrode.

In one possible embodiment, the cross-sectional shape of the first solder strip and/or the second solder strip is circular, elliptical or regular polygonal.

The technical scheme provided by the application can achieve the following beneficial effects:

the application provides a photovoltaic module welds respectively on the main electrode of multistage confluence through adopting the multistage solder strip to can disperse welding stress, reduce the warpage degree of back of the body contact battery. The length of the second welding strip is larger than or equal to 2 times of the width of the gap between two adjacent battery pieces, so that the second welding strip and the battery pieces can have enough welding length, and the welding reliability between the second welding strip and the electrodes on the battery pieces is ensured.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

Fig. 1 is a schematic structural diagram of a photovoltaic module provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a battery plate;

fig. 3 is a schematic structural diagram of the positive electrode main electrode.

Reference numerals:

1-a battery piece;

11-gap;

12-positive main electrode;

13-negative main electrode;

14-positive electrode secondary electrode;

15-negative electrode auxiliary electrode;

1 a-a bus main electrode;

1 b-transport main electrode;

2-a first solder strip;

3-second solder strip.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the terms "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, integrally connected, or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present application, it should be understood that the terms "upper" and "lower" used in the description of the embodiments of the present application are used in a descriptive sense only and not for purposes of limitation. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

The positive electrode and the negative electrode of the back contact battery are both arranged on the back of the battery, and the back contact batteries are interconnected by adopting welding strip welding. The solder strip is usually a whole solder strip with a large length, and when the solder strip is disposed on the back contact battery, the solder strip can extend from one end of the back contact battery to the other end. Because the positive electrode and the negative electrode of the back contact battery are both arranged on the back surface of the battery, the welding strip is also positioned on one side of the back contact battery, so that welding stress is concentrated on one side of the back contact battery, the back contact battery is warped, the warping problem of the back contact battery easily causes the poor phenomena of hidden cracks, fragments and the like of the back contact battery in the subsequent process, the yield of a back contact battery assembly is seriously influenced, and the manufacturing cost is increased.

The embodiment of the application provides a photovoltaic module which can be specifically a back contact battery module. As shown in fig. 1 to 3, the photovoltaic module includes at least one cell string, a first solder ribbon 2, and a second solder ribbon 3. The battery string may include a plurality of battery pieces 1, a positive electrode main electrode 12, a positive electrode auxiliary electrode 14, a negative electrode main electrode 13 and a negative electrode auxiliary electrode 15 are arranged on the back surface of each battery piece 1, the positive electrode main electrode 12 is orthogonally connected with the positive electrode auxiliary electrode 14, the negative electrode main electrode 13 is orthogonally connected with the negative electrode auxiliary electrode 15, and the positive electrode main electrode 12 and the negative electrode main electrode 13 are alternately arranged; the positive main electrode 12 and the negative main electrode 13 each include a transporting main electrode 1b and a bus main electrode 1a, and the transporting main electrode 1b and the bus main electrode 1a are alternately connected in the extending direction of the positive main electrode 12 and the negative main electrode 13. The first welding band 2 has a plurality of stages, and the plurality of stages of the first welding band 2 are welded to the bus main electrode 1a of the positive electrode main electrode 12 and the bus main electrode 1a of the negative electrode main electrode 13, respectively.

The positive electrode main electrode 12 and the negative electrode main electrode 13 may have the same structure, that is, the positive electrode main electrode 12 and the negative electrode main electrode 13 each include a bus main electrode 1a and a transport main electrode 1b which are alternately arranged, and each bus main electrode 1a is capable of being welded with the first welding strip 2, so that the multiple sections of the first welding strips 2 on one positive electrode main electrode 12 or one negative electrode main electrode 13 are arranged at intervals, thereby dispersing welding stress and reducing the warping degree of the back contact battery.

In addition, two adjacent battery pieces 1 may be welded and connected by the second welding strips 3. Specifically, one end of the second welding strip 3 is connected to the bus main electrode 1a of the positive main electrode 12 of one cell 1, the other end of the second welding strip 3 is connected to the bus main electrode 1a of the negative main electrode 13 of another cell 1, a gap 11 is maintained between two adjacent cells 1, and the length of the second welding strip 3 is greater than or equal to 2 times the width of the gap 11.

Wherein, two adjacent back contact battery pieces 1 need keep certain interval after the welding, if there is not interval between the battery piece 1, contact each other, then the risk that battery piece 1 short circuit can take place. And if the distance is kept between two adjacent battery plates 1, the welding series connection can be realized through the second welding strips 3. It should be noted that two ends of the second solder strip 3 need to be connected with the two battery pieces 1 respectively, and if the length of the second solder strip 3 is too small, the welding length between the second solder strip 3 and the battery piece 1 is too small, and then the second solder strip 3 is easily separated from the battery piece 1, so that the welding reliability is low. In this embodiment, the length of the second welding strip 3 is greater than or equal to 2 times the width of the gap 11 between two adjacent battery pieces 1, so that the second welding strip 3 and the battery pieces 1 have a sufficient welding length, and the welding reliability between the second welding strip 3 and the electrodes on the battery pieces 1 is ensured.

In addition, if the distance between two adjacent battery pieces 1 is too small, the two battery pieces 1 are likely to contact and cause short circuit when the battery pieces 1 slightly shake, and if the distance between two adjacent battery pieces 1 is too large, the part between the two battery pieces 1 cannot perform photoelectric conversion, the efficiency of the battery is too low, and if the same number of battery pieces 1 need to be arranged, the too large distance between the two battery pieces 1 causes the overall size of the photovoltaic module including the plurality of battery pieces 1 to be increased, which is not favorable for realizing the miniaturization of the photovoltaic module.

For this reason, in the present embodiment, the width of the gap 11 between two adjacent battery pieces 1 may be 0.8 to 2mm, and the length of the second solder strip 3 may be 1.6 to 6mm. Wherein, through making the clearance 11 width between two adjacent battery pieces 1 within 0.8 ~ 2mm, the length that the area 3 was welded to the second is at 1.6 ~ 6mm, can realize that the second welds the effective welding between area 3 and the battery piece 1, and can avoid two battery pieces 1 to contact each other and take place the short circuit, can also realize the minimizing of distance between the battery piece 1 on this basis, promote the efficiency of battery. In this embodiment, the interval between two adjacent battery pieces 1 can be 0.8mm, 1.2mm, 1.6mm, 2mm, and the length of second solder strip 3 can be 1.6mm, 2mm, 3mm, 4mm, 5mm, 6mm.

The positive main electrode 12 and the negative main electrode 13 may be arranged in parallel, the positive main electrodes 12 and the negative main electrodes 13 may be uniformly distributed on the back of the battery piece 1, the positive sub-electrodes 14 and the negative sub-electrodes 15 are also arranged in parallel, the positive sub-electrodes 14 and the negative sub-electrodes 15 may be uniformly distributed on the back of the battery piece 1, one positive main electrode 12 may be connected to the positive sub-electrodes 14, and one negative main electrode 13 may be connected to the negative sub-electrodes 15, so that the positive main electrode 12 and the negative main electrode 13 may uniformly collect current, and the problem of efficiency reduction of the back-contact battery piece 1 due to non-uniform current collection is avoided.

Specifically, the positive electrode sub-electrode 14 is spaced apart from the adjacent negative main electrode 13, and the negative electrode sub-electrode 15 is spaced apart from the adjacent positive main electrode 12. That is, the positive electrode sub-electrode 14 is not in contact with the adjacent negative main electrode 13, the negative electrode sub-electrode 15 is not in contact with the adjacent positive main electrode 12, and the positive electrode sub-electrode 14 is not in contact with the negative electrode sub-electrode 15, so as to avoid short circuit between the battery pieces 1. Wherein, the positive electrode main electrode 12 can only contact with the positive auxiliary electrode 14, the positive auxiliary electrode 14 is used for guiding current, and the positive electrode main electrode 12 is used for collecting current; similarly, the negative main electrode 13 may only contact the negative sub-electrode 15, the negative sub-electrode 15 is used for guiding current, and the negative main electrode 13 is used for collecting current.

As a specific implementation, the ratio between the length of the first solder strip 2 and the length of the second solder strip 3 ranges from 1.5 to 3. Wherein, make first solder strip 2 longer relatively, be favorable to transmission current, promote battery efficiency.

As a specific implementation manner, along a direction perpendicular to the extending direction of the positive main electrode 12 and the negative main electrode 13, the projection of the bus main electrode 1a of the positive main electrode 12 coincides with the projection of the bus main electrode 1a of the negative main electrode 13, and the projection of the transporting main electrode 1b of the positive main electrode 12 coincides with the projection of the transporting main electrode 1b of the negative main electrode 13. Therefore, when two battery pieces 1 are welded through the second welding strip 3, one of the battery pieces 1 can be rotated by 180 degrees, so that the positive main electrode 12 of one battery piece 1 and the negative main electrode 13 of the other battery piece 1 are aligned on a straight line, thereby facilitating the welding of two adjacent battery pieces 1 and improving the aesthetic appearance of the battery pieces 1.

Specifically, the first solder strip 2 is welded and fixed to the bus main electrode 1a far from the edge of the battery piece 1, and the second solder strip 3 is welded and fixed to the bus main electrode 1a near the edge of the battery piece 1.

One of the positive electrode main electrode 12 and the negative electrode main electrode 13 may include a plurality of segments of bus main electrodes 1a and transport main electrodes 1b, and the portions at the two ends of the positive electrode main electrode 12 and the negative electrode main electrode 13 are the bus main electrodes 1a, so that the welding of two adjacent battery pieces 1 is realized through the bus main electrodes 1a at the two ends. That is, the bus main electrode 1a located at both ends of the positive main electrode 12 and the negative main electrode 13 needs to be connected to the second solder ribbon 3, and the bus main electrode 1a located between both ends of the positive main electrode 12 and the negative main electrode 13 is connected to the first solder ribbon 2, so as to realize the main current transmission.

Wherein, the cross-sectional shapes of the first solder strip 2 and the second solder strip 3 can be circular, oval or regular polygon. The regular polygon may be a square, rectangle, or the like. In this embodiment, the cross-sectional shapes of the first welding strip 2 and the second welding strip 3 may be circular, so that welding of the welding strips may be facilitated, and the welding reliability may be improved. Wherein the cross section of the first solder strip 2 and the second solder strip 3 is a cross section in a direction perpendicular to the length direction of the first solder strip 2 and the second solder strip 3.

Specifically, the first solder ribbon 2 and/or the second solder ribbon 3 are at least partially soldered to the transporting main electrode 1 b. That is, the first solder ribbon 2 and the second solder ribbon 3 can be welded and fixed to the bus main electrode 1a, and at the same time, a part of the first solder ribbon 2 and/or the second solder ribbon 3 can be welded to the transport main electrode 1b, so that the welding reliability and the current transmission efficiency can be improved. The length of the first welding strip 2 and/or the second welding strip 3 for welding with the conveying main electrode 1b is less than or equal to 15mm, and specifically may be 15mm, 10mm, or 5mm.

As a specific implementation manner, in the direction perpendicular to the extending direction of the positive electrode 12 and the negative electrode 13, the sectional area S1 of the transporting main electrode 1b and the sectional area S2 of the first solder ribbon 2 satisfy: s1= (1.21 to 1.82) xs 2.

In this embodiment, the sectional area S1 of the transporting main electrode 1b is larger than the sectional area S2 of the first welding strip 2, so that the transporting main electrode 1b has a relatively strong current collecting capability, and at the same time, S1 and S2 satisfy S1= (1.21-1.82) x S2, so that the first welding strip 2 can have a good current transmission capability while realizing a relatively low welding stress, and the efficiency of the battery is ensured.

As a specific implementation manner, the width of the transporting main electrode 1b is larger than that of the bus main electrode 1a, so that silver paste consumed in preparing the electrodes can be saved. Specifically, the conventional positive electrode main electrode 12 is an electrode having a uniform width along its length, and its width is approximately the same as the width of the transport main electrode 1b in the present embodiment. In this embodiment, through setting up the less main electrode 1a that converges of width, can save partly silver thick liquids, save the cost, and when a plurality of battery pieces 1 assembled into photovoltaic module, also can accumulate and save a large amount of silver thick liquids, can alleviate photovoltaic module's weight, realize photovoltaic module's lightweight. In addition, by making the bus main electrode 1a smaller in design, the width of the corresponding solder ribbon can also be reduced, so that the amount of solder ribbon used can be reduced, further reducing the cost.

Specifically, the width of the bus main electrode 1a is 20 to 100 μm. Within this width range, the structural strength of the bus main electrode 1a itself can be ensured, and the current collecting ability can also be ensured. In the present embodiment, the width of the bus main electrode 1a may be specifically 20 μm, 40 μm, 60 μm, 80 μm, 100 μm.

As a specific implementation, the length of the transporting main electrode 1b is smaller than that of the bus main electrode 1a. Therefore, the bus main electrode 1a and the welding strip can have enough welding length, the welding reliability between the welding strip and the bus main electrode 1a is ensured, and the phenomenon that the welding strip and the battery piece 1 are peeled off in the later use process is avoided, so that poor EL is generated.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A photovoltaic module, comprising:

the battery comprises a plurality of battery pieces (1), a positive electrode main electrode (12), a positive electrode auxiliary electrode (14), a negative electrode main electrode (13) and a negative electrode auxiliary electrode (15) are arranged on the back surface of each battery piece (1), the positive electrode main electrode (12) is orthogonally connected with the positive electrode auxiliary electrode (14), the negative electrode main electrode (13) is orthogonally connected with the negative electrode auxiliary electrode (15), and the positive electrode main electrode (12) and the negative electrode main electrode (13) are alternately arranged at intervals; the positive electrode main electrode (12) and the negative electrode main electrode (13) each comprise a transport main electrode (1 b) and a bus main electrode (1 a), and the transport main electrodes (1 b) and the bus main electrodes (1 a) are alternately connected in the extending direction of the positive electrode main electrode (12) and the negative electrode main electrode (13);

a plurality of segments of first welding strips (2), wherein the plurality of segments of first welding strips (2) are respectively welded to a bus main electrode (1 a) of the positive electrode main electrode (12) and a bus main electrode (1 a) of the negative electrode main electrode (13);

one end of the second welding strip (3) is connected to a bus main electrode (1 a) of a positive main electrode (12) of one battery piece (1), the other end of the second welding strip (3) is connected to a bus main electrode (1 a) of a negative main electrode (13) of the other battery piece (1), a gap (11) is kept between every two adjacent battery pieces (1), and the length of the second welding strip (3) is larger than or equal to 2 times of the width of the gap (11).

2. The photovoltaic module according to claim 1, wherein the width of the gap (11) between two adjacent cells (1) is 0.8-2 mm, and the length of the second solder strip (3) is 1.6-6 mm.

3. The photovoltaic module according to claim 1, characterized in that the ratio between the length of the first solder strip (2) and the length of the second solder strip (3) ranges from 1.5 to 3.

4. Photovoltaic module according to claim 1, characterized in that, in a direction perpendicular to the extension direction of the positive main electrode (12) and the negative main electrode (13), the projection of the bus main electrode (1 a) of the positive main electrode (12) coincides with the projection of the bus main electrode (1 a) of the negative main electrode (13), and the projection of the transport main electrode (1 b) of the positive main electrode (12) coincides with the projection of the transport main electrode (1 b) of the negative main electrode (13).

5. The photovoltaic module according to claim 1, wherein the first solder ribbon (2) is soldered to a bus main electrode (1 a) away from the edge of the cell piece (1), and the second solder ribbon (3) is soldered to a bus main electrode (1 a) close to the edge of the cell piece (1).

6. Photovoltaic module according to claim 1, characterized in that, in a direction perpendicular to the extension direction of the positive main electrode (12) and the negative main electrode (13), the cross-sectional area S1 of the transport main electrode (1 b) and the cross-sectional area S2 of the first solder ribbon (2) satisfy: s1= (1.21 to 1.82) xs 2.

7. Photovoltaic module according to claim 1, characterized in that the width of the transporting main electrode (1 b) is greater than the width of the busbar main electrode (1 a);

the length of the transporting main electrode (1 b) is smaller than that of the bus main electrode (1 a).

8. Photovoltaic module according to claim 7, characterized in that the width of the busbar main electrodes (1 a) is comprised between 20 and 100 μm.

9. Photovoltaic module according to any one of claims 1 to 8, characterized in that the positive sub-electrode (14) is spaced from the adjacent negative main electrode (13);

the negative electrode auxiliary electrode (15) is spaced from the adjacent positive electrode main electrode (12).

10. Photovoltaic module according to any one of claims 1 to 8, characterized in that the cross-sectional shape of the first solder strip (2) and/or of the second solder strip (3) is circular, elliptical or regular polygonal.