CN220543932U - Bus bar, solar cell and photovoltaic module - Google Patents

Abstract

The utility model discloses a bus bar, a solar cell and a photovoltaic module. The bus bar comprises a bus bar main body and a connecting piece, wherein the bus bar main body is used for connecting a battery string through the connecting piece, the connecting piece is used for being arranged at an edge electrode, a wiring point or an auxiliary grid line of a battery piece corresponding to the battery string, and the curing temperature of the connecting piece is less than 200 ℃. In the utility model, the connecting piece is arranged at the edge electrode of the battery piece, the junction point of the battery piece or the auxiliary grid line, the solidification temperature of the connecting piece is less than 200 ℃, the melting point of the surface tin layer of the bus bar main body is less than 150 ℃, the bus bar main body is matched with the battery piece, and the bus bar main body and the edge electrode, the junction point or the auxiliary grid line of the battery piece form an alloy layer by using a lamination process, so that the alloy layer can be realized in a low-temperature process, thereby avoiding the high-temperature welding process in the traditional technology and adopting soldering flux, conductive adhesive, tin paste and other intermediate media, and reducing the resistance of transition materials.

Description

Bus bar, solar cell and photovoltaic module

Technical Field

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

Background

In the photovoltaic field, a main flow process for connecting the anode and the cathode of a battery string of a solar battery with a bus bar comprises the following steps: (1) The main grid or the wiring point (PAD point) of the battery piece is matched with soldering flux to be connected with the tin-coated bus belt in a welding way, the welding temperature is about 370-400 ℃, the heterojunction battery cannot be compatible, the TCO film and the amorphous silicon layer of the heterojunction battery can be damaged at high temperature, and the battery piece is invalid; the welding shrinkage rate of the welding strip and the battery piece is different under the high temperature condition, and the risk of cracking is high; the surface of the bus tape must be coated with a tin layer. (2) The main grid or the wiring point of the battery piece is bonded with the bus bar through conductive materials such as conductive adhesive/solder paste, and the dual functions of bonding and conductivity in the mode have higher requirements on materials, so that reliability risks exist in case of failure; the conductive adhesive is high in price, so that the use cost is high, the requirements on the production process and equipment spraying precision are high, and the risk of short circuit caused by adhesive overflow exists.

Disclosure of Invention

Based on this, it is necessary to provide a bus bar. The bus bar has low technological requirements when being connected with the battery piece or the battery string, low production cost and high assembly reliability, and is suitable for various solar batteries.

An embodiment of the present application provides a bus bar.

The utility model provides a busbar, includes busbar main part and connecting piece, the connecting piece is connected the busbar main part, the busbar main part is used for passing through the connecting piece connects the battery cluster, the connecting piece is used for setting up the marginal electrode department, the junction department or the auxiliary grid line department of corresponding battery piece on the battery cluster, the solidification temperature of connecting piece is less than 200 ℃.

In some of these embodiments, the connector is a non-conductive adhesive disposed at an edge electrode, a junction point, or an auxiliary grid line of the battery cell.

In some of these embodiments, the non-conductive adhesive is an acrylic, silicone, epoxy, or polyurethane adhesive prepared from an acrylic, silicone, epoxy, or polyurethane material.

In some embodiments, the connecting member is a high-temperature transparent adhesive tape, and the high-temperature transparent adhesive tape is arranged at a junction point or an auxiliary grid line of a corresponding battery piece on the battery string.

In some of these embodiments, the high temperature scotch tape has a melting point above 200 ℃.

In some of these embodiments, a plurality of the connectors are connected to the bus bar body.

In some of these embodiments, the bus bar body is a low Wen Duxi copper strip.

In some of these embodiments, the surface tin plating of the bus bar body has a melting point below 150 ℃.

In some of these embodiments, one or both sides of the bus bar body have a tin plating.

An embodiment of the application also provides a solar cell.

The solar cell at least comprises a bus bar and a plurality of cell strings, wherein the bus bar main body is connected with the cell strings through connecting pieces, and the connecting pieces are arranged at edge electrodes, wiring points or auxiliary grid lines of corresponding cell pieces on the cell strings.

An embodiment of the application also provides a photovoltaic module.

A photovoltaic module includes the solar cell.

The bus bar has low technological requirements when being connected with the battery piece or the battery string, low production cost and high assembly reliability, and is suitable for various solar batteries. The bus bar and the battery piece can be connected under the low-temperature process, so that the high-temperature welding process in the traditional technology is avoided, and intermediate media such as soldering flux, conductive adhesive and tin paste are adopted, so that the resistance of the transition material is reduced.

In the solar cell, the bus bar main body is connected with the cell string through the connecting piece, the connecting piece is arranged at the edge electrode, the wiring point or the auxiliary grid line of the corresponding cell piece on the cell string, the solidification temperature of the connecting piece is lower than 200 ℃, the melting point of the tin layer on the surface of the bus bar main body is lower than 150 ℃, the bus bar main body is matched with the cell piece, the bus bar main body with low temperature is fixed at the appointed position of the cell piece such as the edge electrode, the wiring point or the auxiliary grid line where low temperature silver paste is printed by adopting a high temperature adhesive tape or a non-conductive adhesive, and the alloy layer is formed between the bus bar main body and the edge electrode, the wiring point or the auxiliary grid line of the cell piece by utilizing the subsequent lamination process in the assembly manufacturing process.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort to a person skilled in the art.

For a more complete understanding of the present application and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. Wherein like reference numerals refer to like parts throughout the following description.

FIG. 1 is a schematic front view of a solar cell according to an embodiment of the utility model when the solar cell is connected to an edge electrode;

FIG. 2 is a schematic side view of a solar cell edge electrode according to an embodiment of the utility model;

FIG. 3 is a schematic front view of a solar cell according to an embodiment of the utility model when the solar cell is connected to an auxiliary grid line;

FIG. 4 is a schematic side view of a solar cell according to an embodiment of the utility model when the solar cell is connected to an auxiliary grid line;

FIG. 5 is a schematic front view of a solar cell connection point according to an embodiment of the utility model;

FIG. 6 is a schematic side view of a solar cell connection point according to an embodiment of the utility model;

FIG. 7 is a schematic front view of a solar cell according to an embodiment of the utility model when connecting junction points with a high-temperature transparent adhesive tape;

FIG. 8 is a schematic side view of a solar cell according to an embodiment of the utility model when connecting junction points with a high-temperature transparent adhesive tape;

FIG. 9 is a schematic front view of a solar cell according to an embodiment of the utility model when the solar cell is connected to an auxiliary grid line by using a high-temperature transparent adhesive tape;

fig. 10 is a schematic side view of a solar cell according to an embodiment of the utility model when a high-temperature transparent adhesive tape is used to connect auxiliary grid lines.

Description of the reference numerals

10. A solar cell; 100. a bus bar body; 200. a connecting piece; 300. a battery sheet; 301. an edge electrode; 302. a junction point; 303. and an auxiliary gate line.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present utility model, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The embodiment of the application provides a bus bar and a solar cell 10, so as to solve the problems that a conventional technology needs about 370-400 ℃ when a main grid or a wiring point 302 of a cell 300 is matched with soldering flux and a bus bar is welded, and a TCO film and an amorphous silicon layer of the cell are damaged, so that the cell 300 is invalid or cracked; the traditional bus belt has the problem of high cost caused by the need of coating a tin layer on the surface; and at least one of the problems of high material requirements, high use cost and high requirements on the spraying precision of production process and equipment existing in the conventional technology when the main grid or the wiring points 302 of the battery piece 300 are adhered to the bus bar through conductive materials such as conductive adhesive or solder paste. The solar cell 10 will be described below with reference to the accompanying drawings.

The bus bar provided in the embodiment of the present application includes a bus bar main body 100 and a connector 200. The connector 200 is connected to the bus bar body 100. The bus bar body 100 is used to connect battery strings through a connector 200. The connector 200 is used for being arranged at an edge electrode 301 of a battery plate 300 corresponding to a battery string, a battery string connection point 302 or an auxiliary grid line 303. The curing temperature of the connector 200 is less than 200 c.

The bus bar has low technological requirements when being connected with the battery strings, low production cost and high assembly reliability, and is suitable for various solar batteries. The connection between the bus bar and the battery piece 300 of the battery string can be realized under a low-temperature process, so that the high-temperature welding process in the traditional technology is avoided, and intermediate media such as soldering flux, conductive adhesive, tin paste and the like are adopted, so that the resistance of the transition material is reduced.

In some of these embodiments, the connector 200 is a non-conductive adhesive disposed at the edge electrode 301, the junction 302, or the auxiliary grid 303 of the battery cell 300 corresponding to the battery string.

In some of these embodiments, the non-conductive adhesive is an acrylic, silicone, epoxy, or polyurethane adhesive that is made from an acrylic, silicone, epoxy, or polyurethane material.

In some embodiments, to form a certain glue thickness, additives or substances such as curing agents, cross-linking agents, coupling agents or rubber balls are added into the non-conductive adhesive.

In this application, during processing, one of the connection modes is: referring to fig. 1 and 2, a non-conductive adhesive is sprayed or printed on the edge electrode 301 of the battery 300 corresponding to the battery string in a fixed amount, so that the edge electrode 301 is adhered and fixed to the bus bar main body 100, and then pre-cured at a temperature lower than 200 ℃ to have a certain adhesive force, so that the edge electrode 301 and the bus bar main body 100 form a certain alloy, and the alloy degree between the bus bar main body 100 and the edge electrode 301 is further deepened by a lamination process.

In some embodiments, one way of connecting is: the non-conductive adhesive is sprayed or printed at the auxiliary grid line 303 (shown in fig. 3 and 4) or the junction point 302 (shown in fig. 5 and 6) of the battery 300 corresponding to the battery string in a fixed amount, so that the junction point 302 or the auxiliary grid line 303 of the battery 300 is adhered and fixed to the bus bar main body 100, and the bus bar main body 100 and the junction point 302 or the auxiliary grid line 303 of the battery 300 form an alloy layer by using a subsequent lamination process.

In some embodiments, one way of connecting is: the high temperature transparent adhesive tape is directly used to attach and fix the corresponding connection point 302 (see fig. 7 and 8) of the battery plate 300 or the auxiliary grid line 303 (see fig. 9 and 10) of the battery string to the bus bar main body 100, and the subsequent lamination process is used to form an alloy layer between the bus bar main body 100 and the connection point 302 or the auxiliary grid line 303 of the battery plate 300.

In some embodiments, the connector 200 is a high temperature transparent adhesive tape, and the high temperature transparent adhesive tape is disposed on the battery string at the connection point 302 or the auxiliary grid line 303 corresponding to the battery piece 300.

In some of these embodiments, the high temperature scotch tape has a melting point above 200 ℃.

In some of these embodiments, the bus bar body 100 has a plurality of connectors 200 connected thereto.

In some of these embodiments, the busbar body 100 is a low Wen Duxi copper strip.

In some of these embodiments, the surface tin-plated layer of the bus bar body 100 has a melting point below 150 ℃.

In some of these embodiments, one or both sides of the bus bar body 100 have a tin plating.

In some of these embodiments, the battery cell 300 comprises a full, half, or shingled battery cell.

An embodiment of the present application provides a solar cell 10.

For example, referring to fig. 1, fig. 1 is a schematic structural diagram of a solar cell 10 according to an embodiment of the present application. In order to more clearly describe the structure of the solar cell 10, the solar cell 10 will be described with reference to the accompanying drawings.

For example, referring to fig. 1, a solar cell 10 includes at least a bus bar body 100, a connector 200, and a cell string.

The bus bar body 100 is connected to the battery string through a connector 200. The connection member 200 is disposed at an edge electrode 301, a connection point 302, or an auxiliary grid line 303 of the battery cell 300 corresponding to the battery string. The curing temperature of the connector 200 is less than 200 c.

In the solar cell 10, the bus bar main body 100 is connected with the cell string through the connecting piece 200, the connecting piece 200 is arranged at the edge electrode 301, the junction point 302 or the auxiliary grid line 303 of the cell 300, the solidification temperature of the connecting piece 200 is lower than 200 ℃, the melting point of the surface tin layer of the bus bar main body 100 is lower than 150 ℃, the bus bar main body 100 and the cell 300 are matched, the bus bar main body 100 with low temperature is fixed at a designated position of the cell 300, such as the edge electrode 301 printed with low temperature silver paste, the junction point 302 or the auxiliary grid line 303 by adopting a high temperature adhesive tape or a non-conductive adhesive, and the subsequent lamination process in the assembly manufacturing process is utilized to form an alloy layer between the bus bar main body 100 and the edge electrode 301, the junction point 302 or the auxiliary grid line 303 of the cell 300.

An embodiment of the application also provides a photovoltaic module.

A photovoltaic module comprising the solar cell 10 described above.

In summary, compared with the conventional technology, the solar cell 10 of the present utility model has the following advantages:

(1) The direct attachment of the battery plate 300 to the low temperature bus bar reduces the resistance of the transition material, such as conductive paste and solder paste.

(2) The reliability problem of the photovoltaic module caused by failure of the conductive adhesive/solder paste is reduced, and the defect of imperfect dual functions of bonding and conductive adhesive is avoided.

(3) The equipment process requirement is reduced, the glue overflow risk is completely avoided, and the package cost of the component is greatly reduced.

(4) The temperature required by lamination alloying is less than 200 ℃, and the laminated alloy is completely matched with various solar cell structures such as heterojunction cells and the like.

(5) The adhesive/high-temperature transparent adhesive tape is used for adhering and fixing the low-temperature bus bar and the battery piece 300, so that cracking caused by welding stress is avoided.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. The utility model provides a busbar, its characterized in that includes busbar main part (100) and connecting piece (200), connecting piece (200) connect busbar main part (100), busbar main part (100) are used for through connecting piece (200) connect battery cluster, connecting piece (200) are used for setting up at edge electrode (301) department, junction (302) department or auxiliary grid line (303) department of corresponding battery piece (300) on the battery cluster, the solidification temperature of connecting piece (200) is less than 200 ℃.

2. The bus bar according to claim 1, characterized in that the connection member (200) is a non-conductive adhesive provided at an edge electrode (301), a junction point (302) or an auxiliary grid line (303) of a corresponding battery piece (300) on the battery string.

3. The bus bar of claim 2, wherein the non-conductive adhesive is an acrylic adhesive, a silicone adhesive, an epoxy adhesive, or a polyurethane adhesive prepared from an acrylic, silicone, epoxy, or polyurethane material.

4. The bus bar according to claim 1, wherein the connection member (200) is a high temperature transparent adhesive tape provided at a connection point (302) of a corresponding battery piece (300) or at an auxiliary grid line (303) on the battery string.

5. The bus bar of claim 4, wherein the high temperature scotch tape has a melting point greater than 200 ℃.

6. The bus bar according to any one of claims 1 to 5, characterized in that a plurality of the connecting pieces (200) are connected to the bus bar main body (100).

7. The bus bar according to any of claims 1-5, characterized in that the bus bar body (100) is a low Wen Duxi copper strip.

8. The bus bar according to claim 7, characterized in that the melting point of the surface tin plating of the bus bar body (100) is lower than 150 ℃;

and/or one surface of the bus bar main body (100) is provided with a tin plating layer or two surfaces are respectively provided with a tin plating layer.

9. Solar cell (10), characterized by comprising at least a bus bar according to any of claims 1-8 and several cell strings, wherein the bus bar body (100) is connected to the cell strings by means of the connection members (200), the connection members (200) being arranged at the edge electrodes (301), at the junction points (302) or at the auxiliary grid lines (303) of the respective cell sheets (300) on the cell strings.

10. A photovoltaic module characterized by comprising a solar cell (10) according to claim 9.