CN209929324U

CN209929324U - Battery piece connection structure and photovoltaic module

Info

Publication number: CN209929324U
Application number: CN201920247433.5U
Authority: CN
Inventors: 吕涛
Original assignee: Zhejiang Longi Solar Technology Co Ltd
Current assignee: Zhejiang Longi Solar Technology Co Ltd
Priority date: 2019-02-27
Filing date: 2019-02-27
Publication date: 2020-01-10
Anticipated expiration: 2029-02-27

Abstract

The utility model provides a battery piece connection structure and photovoltaic module relates to the photovoltaic field, can solve the problem that the solder strip connection brought. The specific technical scheme is as follows: a battery piece connecting structure is characterized by comprising a conductive adhesive and a fixing piece, wherein a photovoltaic module battery piece comprises a first battery piece and a second battery piece, and the conductive adhesive is connected with the positive electrode of the first battery piece and the negative electrode of the second battery piece; the fixing piece is provided with a groove for accommodating the conductive adhesive. A photovoltaic module is characterized by comprising the cell connecting structure. Connect first battery piece and second battery piece through conducting resin, the mounting is used for fixing or holds conducting resin, does not have the solder strip, need not carry out high temperature welding, and photovoltaic module's life is longer.

Description

Battery piece connection structure and photovoltaic module

Technical Field

The present disclosure relates to the field of photovoltaics, and in particular, to a cell sheet connection structure, a cell string, and a photovoltaic module.

Background

In most photovoltaic industries, solder strips, soldering flux and a high-temperature welding machine are needed to realize interconnection of battery plates when components are manufactured, however, the welding mode has many problems and is a common consensus in the industry. The current welding method using the welding strip has the following defects: flux is used, the components are easy to crack and fragment in the manufacturing process, the internal resistance of the solder strip influences the power of the components, and the solder strip is required to be welded and contacted at high temperature.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a battery piece connecting structure and a photovoltaic module, which can solve the problem caused by welding strip connection. The technical scheme is as follows:

a battery piece connecting structure is characterized by comprising a conductive adhesive and a fixing piece, wherein a photovoltaic module battery piece comprises a first battery piece and a second battery piece, and the conductive adhesive is connected with the positive electrode of the first battery piece and the negative electrode of the second battery piece; the fixing piece is provided with a groove for accommodating the conductive adhesive. Connect first battery piece and second battery piece through conducting resin, the mounting is used for fixing or holds conducting resin, does not have the solder strip, need not carry out high temperature welding, and photovoltaic module's life is longer.

In a preferred embodiment of the present invention, each conductive adhesive includes a first conductive portion connected to the positive electrode of the first cell, a second conductive portion connected to the negative electrode of the second cell, and a third conductive portion connecting the first conductive portion and the second conductive portion, and the third conductive portion is disposed between the gaps of the first cell and the second cell.

In a preferred embodiment of the present invention, the fixing member is formed with at least one groove for accommodating the plurality of conductive adhesives respectively.

In the preferred embodiment of the present invention, the number of the grooves is equal to the number of the main grid lines of the photovoltaic module cell.

In the preferred embodiment of the present invention, the position of the groove corresponds to the position of the main grid line of the photovoltaic module cell.

In the preferred embodiment of the present invention, the photovoltaic module cell has a main grid line, the groove extends along the main grid line, and the groove is used for fixing the cell inside the cell string.

In the preferred embodiment of the present invention, the photovoltaic module cell has a main grid line, the extending direction of the groove intersects with the extending direction of the main grid line, and the groove is used to fix the cell between the adjacent cell strings.

In the preferred embodiment of the present invention, the fixing member further has a battery piece groove for accommodating the battery piece of the photovoltaic module.

A photovoltaic module is characterized by comprising the cell connecting structure.

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 disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

Fig. 1 is a schematic perspective view of a battery piece connected by a battery piece connecting structure according to a first embodiment of the disclosure;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic view of a groove and a film according to a first embodiment of the present disclosure;

FIG. 4 is a schematic plan view of a first connection structure in a first embodiment of the present disclosure;

FIG. 5 is a schematic plan view of a second connection structure in the first embodiment of the present disclosure;

fig. 6 is a schematic view of the cell plates connected by the first connection structure and the second connection structure;

fig. 7 is a schematic plan view of a battery sheet connection structure in a second embodiment of the present disclosure.

Icon: 100-cell connection structure; 110-conductive glue; 111-a first conductive portion; 112-a second conductive portion; 113-a third conductive portion; 120-a fixture; 121-a first fixture; 122-a second fixture; 123-groove; 130-a first attachment structure; 131-vertical grooves; 132-vertical fixing member; 140-a second attachment structure; 141-a lateral groove; 142-a transverse fixing member; 200-cell connection structure; 210-a stationary body; 220-cell groove; 211-a first cell; 212-second cell piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "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; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The inventor finds that the current welding mode using the welding strip has the following defects: 1. when the welding strip is welded, the soldering flux is required to be used, otherwise, the welding is difficult, and the soldering flux has a sharp taste and is unfavorable for the environment; 2. after the welding strip is welded, the assembly is easy to crack and fragment in the manufacturing process; 3. the internal resistance of the solder strip affects the power of the assembly, and can shield a part of battery pieces to affect the efficiency of the assembly; 4. the welding of the welding strip needs high-temperature contact, the thermal stress of the battery piece is very large, and the battery piece is easy to damage; 5. the welding mode has higher requirements on the silver paste content of the main grid of the cell and the selection requirement of the welding strip; 6. the assembly connected by the welding strip is easy to generate heat in the operation process, and the inside of the assembly is easy to age and corrode after long-time operation.

Since the photovoltaic industry always uses solder strips as connecting links, the solder strips have a problem which is a difficulty in the photovoltaic industry. The technical scheme provided by the inventor is to replace the solder strip by conductive adhesive or conductive adhesive tape.

First embodiment

Referring to fig. 1 and 2, the present embodiment provides a cell connection structure 100, which includes a conductive adhesive 110 and a fixing member 120, a photovoltaic module cell includes a first cell and a second cell, the conductive adhesive 110 connects an anode of the first cell 211 and a cathode of the second cell 212, and the fixing member 120 is used for fixing, connecting or installing the conductive adhesive 110.

The solder strips are replaced by conductive glue 110 or conductive tape. Each conductive paste 110 includes a first conductive portion 111, a second conductive portion 112, and a third conductive portion 113. The first conductive part 111 is connected with the positive electrode of the first cell piece 211, the second conductive part 112 is connected with the negative electrode of the second cell piece 212, the third conductive part 113 is connected with the first conductive part 111 and the second conductive part 112, and the third conductive part 113 is positioned between the gap between the first cell piece 211 and the second cell piece 212.

The length of the conductive adhesive 110 is flexibly used according to the grid lines of the battery piece, and in this embodiment, the width of the conductive adhesive 110 is 0.8+ -0.1mm, and the thickness is 0.1+ -0.05 mm. The number of the conductive adhesives 110 is selected according to the requirement, and in the embodiment, the battery plate connection structure includes five conductive adhesives 110.

The fixing member 120 includes a first fixing member 121 accommodating the conductive paste 110 and a second fixing member 122 accommodating the conductive paste 110. The fixing member 120 is provided with at least one groove 123, that is, the first fixing member 121 is provided with at least one groove 123, the second fixing member 122 is provided with at least one groove 123, and the number of the grooves 123 is equal to the number of the main grid lines of the battery piece.

The first fixing member 121 has the same structure as the second fixing member 122. The first fixing member 121 is provided with a groove 123, the groove 123 does not penetrate through the first fixing member 121, and the groove 123 is used for accommodating the conductive adhesive 110. In this embodiment, one groove 123 accommodates one conductive adhesive 110, the conductive adhesives 110 are arranged at intervals, and each conductive adhesive 110 is connected with a corresponding main gate line, so that the conductive effect is better; it should be understood that in other embodiments, one recess 123 may accommodate all of the conductive adhesive 110. The number of grooves 123 is selected as desired. In the present disclosure, the fixing member 120 includes, but is not limited to, high temperature resistant transparent film material, EVA, POE, etc., for example, the high temperature resistant transparent film material includes, but is not limited to, polyimide (P I), Polybenzimidazole (PBI), PPY, PPQ, etc. polymer material.

The first fixing member 121 accommodates the conductive adhesive in the groove 123, and prevents the conductive adhesive 110 from being connected to the second battery piece, so as to avoid interference between the first battery piece 211 and the second battery piece 212, that is, avoid conduction between the positive electrode of the first battery piece 211 and the positive electrode of the second battery piece 212. The second fixing member 122 accommodates the conductive adhesive in the groove 123 to prevent the first cell 211 and the second cell 212 from interfering with each other, that is, prevent the negative electrode of the first cell 211 and the negative electrode of the second cell 212 from being conducted. The fixing member 120 in this embodiment includes a first fixing member 121 and a second fixing member 122, which respectively insulate the first conductive portion 111 and the second conductive portion 112; it is understood that only the first fixing member 121 or the second fixing member 122 may be used.

In this embodiment, the first fixing member 121 and the second fixing member 122 are made of high temperature resistant transparent films, the surfaces of the films are soft and have certain hardness, the thickness of the film is 0.15mm, the length of the film is consistent with that of the battery piece, and the width of the film is 10+ -1 mm.

Referring to fig. 4 and 5, in the present embodiment, the cell connecting structures are divided into a first connecting structure 130 and a second connecting structure 140. In one example, the first connection structure 130 is referred to as a vertical connection structure and the second connection structure 140 is referred to as a lateral connection structure according to an extending direction of the battery cell, the film, or the conductive paste. The battery pieces in the battery strings are connected through a first connecting structure 130, and the adjacent battery strings are connected through a second connecting structure 140.

Referring to fig. 3 and 4, which show schematic views of the first connection structure 130, the fixing members 120 of the first connection structure 130 are also referred to as vertical fixing members 132, the grooves of the vertical fixing members 132 are referred to as vertical grooves 131, and the vertical grooves 131 extend along the direction of the main grid lines of the battery piece. The conductive adhesive 110 is disposed on the front surface of the first cell piece 211 and the back surface of the second cell piece 212. The first connection structure 130 connects the battery cells in the battery string. The length of the vertical fixing member 132 is consistent with that of the battery piece, the width is 10+ -1mm, a vertical groove 123 is formed in the vertical fixing member, the width of the vertical groove 123 is 0.8+ -0.1mm, the depth is 0.07+ -0.01mm, and the length is 6 mm.

Referring to fig. 5, a schematic diagram of a second connection structure 140 is shown. The fixing member 120 of the second connecting structure 140 is referred to as a transverse fixing member 142, the groove of the transverse fixing member 142 is referred to as a transverse groove 141, and the transverse groove 141 intersects with the extending direction of the cell main grid line. The conductive adhesive 110 is disposed on the front surface of the first cell piece 211 and the back surface of the second cell piece 212. The second fixing member 142 serves to laterally connect and converge the batteries between the battery strings. The transverse fixing member 142 has a width of 5+ -1mm, a length of 10+ -1mm and a thickness of 0.15 mm. Fixing piece

Referring to fig. 6, fig. 6 is a schematic diagram illustrating the connection of the battery cells through the first connection structure 130 and the second connection structure 140. The first connecting structure 130, namely a vertical connecting structure, is adopted in the battery string; a second type of connection structure 140, i.e., a lateral connection structure, is used between the battery strings. The distance between the battery pieces is 2+ -1mm, and gaps are reserved between the battery pieces, so that the battery pieces are prevented from being collided too close to each other and prevented from being hidden or broken.

The assembly method of the photovoltaic module comprises the following steps:

1. firstly, coating a conductive adhesive 110 on a main gate and a back gate of a cell or pasting a conductive adhesive tape on the main gate and the back gate;

2. then coating the conductive adhesive 110 at the position of the high-temperature-resistant transparent film corresponding to the groove 123 of the grid line, connecting the conductive adhesive 110 at the position of the groove 123 of the film with the positive electrode of the previous battery piece, and attaching the film part without the groove 123 to the next battery piece to play a role in connecting the two battery pieces and stabilizing the battery pieces, and simultaneously playing an insulating role between the grid lines; the battery strings are also transversely connected by using a conductive adhesive 110 and a high-temperature resistant transparent film; in the connection state between the battery gaps, the two films are adhered through the conductive adhesive 110.

3. After the battery strings are arranged orderly, transversely coating conductive adhesive 110 or pasting conductive adhesive tapes on two ends of the first piece and the last piece of each battery piece string, then coating a layer of conductive adhesive 110 in the middle of the film 2, wherein the length of the conductive adhesive 110 is 6+ -1mm, the width is 2+ -0.5mm, and the thickness is 1+ -0.5mm, and then regularly pasting the conductive adhesive between the two battery strings to form a series-connected and conductive assembly.

The photovoltaic module is connected with the battery plates by using the battery plate connecting structure 100, no welding strip is arranged in the photovoltaic module, high-temperature welding is not needed, and the service life of the module is longer.

Second embodiment

Referring to fig. 7, the present embodiment provides a battery piece connecting structure 200, which is substantially the same as the battery piece connecting structure 100 of the first embodiment, and the difference between the two is that a fixing member 120 is different. In the first embodiment, two adjacent battery pieces are connected by two fixing pieces 120, that is, by a first fixing piece 121 and a second fixing piece 122; in the second embodiment, all the battery pieces are connected by one fixing member, which is referred to as a fixing body 210 in this embodiment. In the present disclosure, the fixing body 210 includes, but is not limited to, a high temperature resistant transparent film material, EVA, POE, etc., for example, the high temperature resistant transparent film material includes, but is not limited to, a polymer material such as polyimide (P I), polybenzimidazole (PB I), PPY, PPQ, etc.

In the present embodiment, the fixing body 210 is illustrated by using a film as an example, for example, the film is a high temperature resistant transparent film. The size of the fixing body 210 can be selected according to the requirement, in this embodiment, the size of the fixing body 210 is the size of the photovoltaic module, and the size of the fixing body 210 is close to the size of the EVA/POE board.

The fixing body 210 is provided with a battery piece groove 220 for installing a battery piece, the battery piece groove 220 is used for installing the battery piece, and the size of the battery piece groove 220 is matched with that of the battery piece. Each battery tab is mounted to a corresponding power tab recess 220.

The fixing body 210 is further provided with a plurality of transverse grooves 141 for transverse connection of the battery cells and a plurality of vertical grooves 131 for vertical connection of the battery cells, and the transverse grooves 141 and the vertical grooves 131 are conductive adhesive grooves, so that the first connection structure 130 and the second connection structure 140 are formed on the fixing body 210. A first connection structure 130 is used for the interior of the battery strings and a second connection structure 140 is used for the interior of the battery strings.

In this embodiment, the fixing body 210 is a film or a high temperature resistant transparent film, and the manufacturing of the battery piece connecting structure 200 is illustrated by taking a film as an example, and the high temperature resistant transparent film is a large film, similar to the size of EVA/POE. Then, EVA/POE material is added to the surface of the film, which is in contact with the glass, the surface is laid on the assembly glass, and the transverse groove 141, the vertical groove 131 and the battery piece groove 220 are arranged on the surface, which is in contact with the battery piece, of the film. In the production process, the conductive adhesive is directly sprayed on the groove position of the film and the front/back grid line position of the cell, and then the cell is placed at the corresponding position of the film. After the placement of all the battery pieces is realized, spraying conductive adhesive on the other side of the battery pieces, paving EVA/POE on the conductive adhesive after the conductive adhesive is well bonded, and then stacking the last glass/back plate.

Fixed main part 210 has seted up power piece recess 220, and the battery piece is installed in battery piece recess 220, and the battery piece arrange convenient, can not take place the skew, has avoided the latent piece and the piece of splitting of battery piece. In addition, the photovoltaic module uses the battery piece connecting structure 200, no welding strip is arranged in the module, the heat generation in the module is reduced, and the service life of the module is longer.

The utility model also provides a photovoltaic module, including above-mentioned battery piece connection structure 100.

This description describes examples of embodiments of the invention, and is not intended to illustrate and describe all possible forms of the invention. It should be understood that the embodiments described in this specification can be implemented in many alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Specific structural and functional details disclosed are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention. It will be appreciated by persons skilled in the art that a plurality of features illustrated and described with reference to any one of the figures may be combined with features illustrated in one or more other figures to form embodiments which are not explicitly illustrated or described. The described combination of features provides a representative embodiment for a typical application. However, various combinations and modifications of the features consistent with the teachings of the present invention may be used as desired for particular applications or implementations.

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

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery piece connecting structure is characterized by comprising a conductive adhesive and a fixing piece, wherein a photovoltaic module battery piece comprises a first battery piece and a second battery piece, and the conductive adhesive is connected with the positive electrode of the first battery piece and the negative electrode of the second battery piece; the fixing piece is provided with a groove for accommodating the conductive adhesive.

2. The battery piece connecting structure according to claim 1, wherein each of the conductive adhesives includes a first conductive portion connected to a positive electrode of the first battery piece, a second conductive portion connected to a negative electrode of the second battery piece, and a third conductive portion connecting the first conductive portion and the first conductive portion, and the third conductive portion is disposed between a gap between the first battery piece and the second battery piece.

3. The battery piece connecting structure according to claim 1, wherein the fixing member is provided with at least one groove for respectively accommodating the plurality of conductive adhesives.

4. The cell connection structure according to claim 3, wherein the number of the grooves is equal to the number of the bus bars of the photovoltaic module cell.

5. The cell connection structure according to claim 1, wherein the groove is located at a position corresponding to a position of a bus bar of the photovoltaic module cell.

6. The cell connecting structure according to claim 1, wherein the photovoltaic module cell has a main grid line, the groove extends along the main grid line, and the groove is used for fixing the cell inside the cell string.

7. The cell connecting structure according to claim 1, wherein the photovoltaic module cell has a main grid line, the extending direction of the groove intersects with the extending direction of the main grid line, and the groove is used for fixing the cell between adjacent cell strings.

8. The battery piece connecting structure according to claim 1, wherein the fixing member further defines a battery piece groove for accommodating the photovoltaic module battery piece.

9. A photovoltaic module comprising the cell connecting structure according to any one of claims 1 to 8.