CN216120322U

CN216120322U - Photovoltaic bus bar and photovoltaic module

Info

Publication number: CN216120322U
Application number: CN202122079807.7U
Authority: CN
Inventors: 翟卫鑫; 余永林; 朱琛; 吕俊
Original assignee: Taizhou Longi Solar Technology Co Ltd
Current assignee: Taizhou Longi Solar Technology Co Ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-03-22
Anticipated expiration: 2031-08-31

Abstract

The utility model discloses a photovoltaic bus bar and a photovoltaic module, and relates to the technical field of battery piece connection. According to the photovoltaic bus bar, the interconnecting bar between two adjacent battery pieces can be cut in the welding process, the length of the interconnecting bar does not need to be reserved, and the loss of the interconnecting bar is reduced; the interconnecting strips are arranged in the connecting holes during welding, so that the welding area is the whole peripheral surface of the interconnecting strips instead of a part of the outer surface of the traditional interconnecting strips, the welding area is increased, the welding reliability is ensured, and the risk of poor welding is reduced.

Description

Photovoltaic bus bar and photovoltaic module

Technical Field

The utility model relates to the technical field of cell connection, in particular to a photovoltaic bus bar and a photovoltaic module.

Background

Solder strips are important components of photovoltaic modules, primarily for collecting electrical current. At present, the welding strips in the photovoltaic module mainly have two types: the battery comprises an interconnection bar and a bus bar, wherein one end of the interconnection bar is welded on the front surface of one battery piece, the other end of the interconnection bar is welded on the back surface of the other battery piece, and the single battery pieces are connected into a battery string in a series connection mode. The bus bar is connected with the interconnection bar at the head and tail of the battery string to collect the current of the battery string.

The existing series welding machine needs two steps when welding a battery string, wherein the first step is to straighten an interconnection bar, the second step is to weld a battery piece with the interconnection bar, the interconnection bar is welded to the back surface of a next battery piece from the front surface of the previous battery piece, which is a cycle of the interconnection bar, therefore, when the last battery piece of the battery string is welded, the interconnection bar can leave a length section originally used for being welded to the back surface of the next battery piece, and the length section is cut subsequently, only the length used for welding a bus bar is reserved, in order to enable the distance between the bus bar and the battery piece to be in accordance with a standard, when the battery string is welded with the bus bar, the required distance between the head and the tail battery pieces of the battery string and the bus bar is far larger than the piece distance between the battery pieces, and the cut part of the interconnection bar cannot be used, and waste of welding strips is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a photovoltaic bus bar and a photovoltaic module so as to reduce solder strip loss.

In order to achieve the above purpose, the utility model provides the following technical scheme:

the utility model provides a photovoltaic busbar, the busbar is provided with the extension section with one side that the battery cluster is connected, the extension section be used for with the section is reserved to the cluster tail of the interconnection strip on the battery cluster or the section is reserved to the cluster head is connected, the cluster head reserve the section with the section is reserved by the interconnection strip that is located between two adjacent battery pieces and is cut and obtain to the cluster tail.

Compared with the prior art, one side of the photovoltaic bus bar, which is connected with the battery string, is provided with an extension section corresponding to the battery string interconnection bar, the reserved distance of the interconnection bar required in conventional welding is replaced by the extension section in the scheme, the length of the interconnection bar does not need to be reserved in the welding process, the interconnection bar between two adjacent battery pieces is cut, the interconnection bar between the two adjacent battery pieces is cut into two sections which are respectively used as a string tail reserved section of a string tail battery piece of a previous battery string and a string head reserved section of a string head battery piece of a next battery string, the extension section of the bus bar is connected with the string tail reserved section or the string head reserved section, and the loss of the interconnection bar is reduced.

Furthermore, the center of the end part of the free end of the extension section is provided with a connecting hole for the interconnection bar of the battery string to extend into.

Under the condition of adopting above-mentioned technical scheme, extension section tip center is seted up and is supplied interconnection strip male connecting hole, and the connecting hole is arranged in to the interconnection strip during welding for area of weld is the whole peripheral surface of interconnection strip, and not the surface of traditional interconnection strip partly, has increased area of weld, has reduced the risk of welding failure.

Furthermore, the extension sections are uniformly arranged on one side of the bus bar, and the extension sections are the same in number with the interconnection bars and correspond to the interconnection bars one to one.

Under the condition of adopting above-mentioned technical scheme, the interconnection strip on extension section and the battery piece can not the repeated welding, has avoided the not firm and accumulational problem of soldering tin of welding, and the outward appearance is more pleasing to the eye.

Further, the extension section is of a cylindrical structure or a polygonal prism structure.

Further, the outer diameter dimension of the extension section of the cylindrical structure is the same as the thickness dimension of the main body of the bus bar.

Further, the extension section of the polygonal prism structure has an even number of side surfaces, and two opposite side surfaces of the extension section are flush with the main body surface of the bus bar.

Further, the length of the extension section is greater than or equal to 3.5 mm.

Under the condition of adopting the technical scheme, according to the design specification of the minimum creepage distance specified by IEC61730, the method not only accords with the design specification, but also ensures the utilization rate of the area of the assembly.

Further, the outer surface of the free end of the extension section and the inner surface of the connecting hole are plated with tin.

Further, the diameter of the connecting hole is 1.1-1.8 times of the diameter of the interconnecting bar.

Under the condition of adopting the technical scheme, as the diameter of the connecting hole is larger than that of the interconnection bar, the interconnection bar is easy to be arranged in the connecting hole of the extension section, and the interconnection bar and the extension section are convenient to weld; also can plate more tin in consequently the connecting hole, improve the stability that interconnection strip and extension section are connected, because soldering tin has also avoided the emergence of soldering tin at the outside accumulational condition of extension section in the connecting hole, make photovoltaic module outward appearance more pleasing to the eye.

A photovoltaic module comprising a string of cells, an interconnect bar and a busbar, the busbar being as described above.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a detailed diagram of parts of an interconnection bar of a battery string in the prior art.

Fig. 2 is a schematic structural diagram of a bus bar according to the present invention.

Fig. 3 is a schematic diagram illustrating a connection state of a bus bar and a battery string according to the prior art.

Fig. 4 is a schematic view of the connection state of the bus bar and the battery string according to the present invention.

Fig. 5 is a schematic view of the cut-off point of the interconnect bar when welded using the bus bar of the present invention.

In the figure:

1-a bus bar; 2-an extension; 3-connecting holes; 4-interconnecting strips.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in 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 utility model and are not intended to limit the utility model.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1, in order to ensure that the distance from the bus bar 1 to the battery piece meets the standard, i.e. the reserved distance D1 for welding the bus bar is shown in the figure, the interconnection bar 4 needs to reserve a welding section D2 with a certain length for welding with the bus bar 1, and when welding with the bus bar 1, the required distance from the head and the tail battery pieces of the battery string to the bus bar is far greater than the piece spacing D3 of the battery pieces, which causes the loss and waste of welding strips.

According to the photovoltaic bus bar provided by the embodiment of the utility model, as shown in fig. 2, an extension section 2 is arranged on one side of a bus bar 1 connected with a battery string, the extension section 2 is uniformly arranged on one side of the bus bar 1, the extension section 2 is used for being connected with a string tail reserved section or a string head reserved section of an interconnection bar on the battery string, the string head reserved section and the string tail reserved section are obtained by cutting the interconnection bar 4 positioned between two adjacent battery pieces, and the extension sections 2 and the battery string interconnection bar 4 are the same in number and are in one-to-one correspondence.

According to the scheme, the reserved distance of the required interconnection bar during conventional welding is replaced by the extension section in the scheme, the interconnection bar between two adjacent battery pieces is cut, the length of the interconnection bar is not required to be reserved more, the interconnection bar between the adjacent battery pieces is cut into two sections, the two sections are respectively used as the string tail reserved section of the string tail battery piece of the previous battery string and the string head reserved section of the string head battery piece of the next battery string, the extension section of the bus bar is connected with the string tail reserved section or the string head reserved section, and the loss of the interconnection bar is reduced.

As shown in fig. 3, when the conventional stringer welds the battery string, since the interconnection bar 4 is directly connected to the bus bar 1, the contact surface is only a part of the outer surface of the interconnection bar 4, and the connection reliability is poor;

therefore, a connecting hole 3 for inserting an interconnection strip 4 of the battery string is formed in the center of the free end part of the extension section 2; during welding, the interconnection strips 4 are arranged in the connecting holes 3, so that the welding area is the whole peripheral surface of the interconnection strips 4 instead of a part of the outer surface of the traditional interconnection strips, the welding area is increased, the welding reliability is guaranteed, and the risk of poor welding is reduced.

In order to further optimize the technical scheme, the extension section 2 is of a cylindrical structure, and the outer diameter size of the extension section is the same as the thickness size of the main body of the bus bar 1, so that the flatness is improved;

the extension section 2 may also be a polygonal prism structure, preferably, the extension section 2 of the polygonal prism structure has an even number of side surfaces, and two opposite side surfaces of the extension section 2 are flush with the main body surface of the bus bar 1, so as to improve the flatness and reduce the stress concentration; the production process can adapt to various production molds, improve the appearance attractiveness and meet the existing requirements.

Advantageously, the length of the extension 2 is greater than or equal to 3.5mm, and the length design is preferably 3.5mm according to the design specification of the minimum creepage distance specified in IEC61730, so that the design specification is met and the utilization rate of the module area is ensured.

It should be noted that the outer surface of the free end of the extension section 2 and the inner surface of the connecting hole 3 are plated with tin to complete the welding of the bus bar 1 and the interconnection bar 4, which not only saves soldering tin, but also improves the stability of the connection of the interconnection bar 1 and the extension section 2.

In order to further optimize the technical scheme, the diameter of the connecting hole 3 is 1.1-1.8 times, preferably 1.5 times, of the diameter of the interconnecting strip 4, and the diameter of the connecting hole 3 is larger than that of the interconnecting strip 4, so that the interconnecting strip 4 is easily arranged in the connecting hole 3 of the extension section 2, and the interconnecting strip 4 and the extension section 2 are conveniently welded; therefore, more tin can be plated in the connecting hole 3, the stability of the connection of the interconnection bar 4 and the extension section 2 is improved, and the appearance is more attractive because the main connecting part in the connecting hole 3 avoids the condition that soldering tin is accumulated outside the extension section 2.

The embodiment of the utility model also discloses a photovoltaic module which comprises a battery string, an interconnection bar 4 and a bus bar 1, wherein the bus bar 1 is the photovoltaic bus bar disclosed above.

The embodiment of the utility model also discloses a preparation method of the photovoltaic module, which comprises the following steps:

step S1: cutting off an interconnection bar between adjacent battery pieces into two sections, wherein the two sections are respectively used as a string tail reserved section of a string tail battery piece of a previous battery string and a string head reserved section of a string head battery piece of a next battery string, and the string tail reserved section and the string head reserved section are both used for connecting bus bars;

step S2: and connecting the extending section of the bus bar with the string tail reserved section or the string head reserved section.

In order to further optimize the technical scheme, in step S1, the interconnection strips between adjacent cells are cut into two segments with the same length, so that the time for trimming the reserved length of the interconnection strip 4 is further saved, and the production efficiency is improved.

By adopting the scheme, the reserved distance of the interconnection bar required in conventional welding is replaced by the extension section of the bus bar in the scheme, the length of the interconnection bar does not need to be reserved in the welding process, the photovoltaic module is cut from the middle of the space between the battery pieces, the extension section of the bus bar is connected with the reserved section at the tail of the string of batteries or the reserved section at the head of the string of batteries, and the loss of the interconnection bar is reduced; and, the interconnecting strip is arranged in the connecting hole during welding, so that the welding area is the whole peripheral surface of the interconnecting strip instead of a part of the outer surface of the traditional interconnecting strip, the welding area is increased, and the connecting reliability is improved.

As shown in fig. 4-5, by using the above-mentioned method for manufacturing a photovoltaic module, when the interconnection bar 4 is connected to the bus bar 1, the interconnection bar 4 between two adjacent battery pieces is cut, and the length of the interconnection bar does not need to be reserved, so that the loss of the solder strip is reduced, the production time is saved, and the solder strip portion can ensure that the distance from the bus bar 1 to the battery piece meets the standard; under the condition, the length taken away by the original welding machine for welding a string of battery slices is reduced from the interval between n +1 half battery slices and n slices to the interval between n half battery slices and n slices, so that the welding speed is improved, and the productivity is increased.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. The utility model provides a photovoltaic bus bar, its characterized in that, the one side that the bus bar is connected with the battery cluster is provided with the extension section, the extension section be used for with the cluster tail reservation section or the cluster head reservation section of the interconnection bar on the battery cluster are connected, the cluster head reservation section with the cluster tail reservation section is cut by the interconnection bar that is located between two adjacent battery pieces and is obtained.

2. The photovoltaic bus bar of claim 1, wherein the free end center of the extension section is provided with a connection hole into which the interconnection bar of the cell string extends.

3. The photovoltaic bus bar of claim 1, wherein the extension segments are uniformly disposed on one side of the bus bar, and the extension segments are in one-to-one correspondence with the interconnection bars in the same number.

4. The photovoltaic bus bar of claim 1, wherein the extension is a cylindrical structure or a polygonal prism structure.

5. A photovoltaic bus bar according to claim 4, wherein the outer diameter of the extended section of the cylindrical structure is the same as the thickness of the main body of the bus bar.

6. A photovoltaic bus bar according to claim 4, wherein the extended section of the polygonal prism structure has an even number of side surfaces, and two opposite side surfaces of the extended section are flush with the main body surface of the bus bar.

7. A photovoltaic bus bar as set forth in claim 1, wherein the length of the extension is greater than or equal to 3.5 mm.

8. A photovoltaic bus bar as set forth in claim 2, wherein the outer surface of the free end of the extension and the inner surface of the connection hole are plated with tin.

9. A photovoltaic bus bar according to claim 2, wherein the diameter of the connection hole is 1.1-1.8 times the diameter of the interconnection bar.

10. A photovoltaic module comprising a string of cells, an interconnect bar and a bus bar, wherein the bus bar is the bus bar of any one of claims 1-9.