CN217507351U - Laminated tile battery string, photovoltaic battery piece and photovoltaic module - Google Patents

Abstract

The application provides a laminated cell string, photovoltaic cells and a photovoltaic module, wherein the laminated cell string comprises at least two photovoltaic cells; the photovoltaic cell comprises a cell body, a front main grid line and a back main grid line, wherein the front main grid line is electrically connected to the front of one end of the cell body, and the back main grid line is electrically connected to the back of the other end of the cell body; the front main grid line comprises a first body and a first electrode part electrically connected to the upper surface of the first body; the back main grid line comprises a second body provided with a slot and a second electrode part which is arranged in the slot and electrically connected with the second body; the first electrode parts of the adjacent photovoltaic cell pieces are inserted into the slots, the second electrode parts in the slots are electrically connected with the first electrode parts of the adjacent photovoltaic cell pieces, and an insulating bonding layer is arranged between the adjacent photovoltaic cell pieces to fixedly connect the adjacent photovoltaic cell pieces. The yield of the laminated cell string made of the photovoltaic cell piece and the utilization rate of the photovoltaic cell piece are higher.

Description

Laminated tile battery string, photovoltaic battery piece and photovoltaic module

Technical Field

The application relates to the field of photovoltaic technology, in particular to a laminated cell string, a photovoltaic cell and a photovoltaic module.

Background

A solar cell is also called a photovoltaic cell, and is a device that directly converts light energy into direct current by using a photovoltaic effect, and a PN junction on a semiconductor in the solar cell can directly convert solar energy into electric energy by using the photovoltaic effect. Among the most common are crystalline silicon solar cells, including single crystalline silicon solar cells and polycrystalline silicon solar cells. The solar cell is generally in the form of a sheet, and one side that can absorb light energy and convert it into electrical energy is called the light-absorbing side or front side, and the other side is called the back side. For some solar cells, the back side can also absorb and convert light energy into electrical energy, and these solar cells are called bifacial cells.

Among them, a photovoltaic device which can be used for a long time is obtained by electrically interconnecting a plurality of solar cells and then encapsulating the solar cells in glass or an organic polymer, and is called a photovoltaic module.

The laminated assembly is a photovoltaic assembly formed by adopting the existing cell interconnection mode, one side of one cell is arranged below the other cell, the front grid line electrode of the cell positioned below and the back electrode of the cell positioned above are mutually overlapped, conductive connection is formed between the two electrodes by adopting conductive adhesive, a plurality of cells are sequentially interconnected to form a laminated cell string according to the same method, and then the laminated assembly is arranged on a frame to form the laminated assembly.

However, current battery piece all need use conducting resin to bond two adjacent battery pieces and rely on the conducting resin to carry out the electrically conductive between the battery piece when the lamination is connected, and there is the risk of excessive gluey short circuit in the connected mode that adopts the conducting resin to the conducting resin is at the in-process that actual processing procedure used, appears the rosin joint because of the equipment fluctuation easily, and the rosin joint department resistance is bigger after the circular telegram, and the temperature is higher when the electric current passes through, has the risk of burning out, and the defective rate is higher.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a shingled battery string, a photovoltaic battery piece and a photovoltaic module, so as to solve the problem that the reject ratio of the photovoltaic battery piece is higher after the shingled battery string is manufactured.

In a first aspect, the present application provides a shingle cell string, which includes at least two photovoltaic cells;

each photovoltaic cell comprises a cell body, a front main grid line and a back main grid line, wherein the front main grid line is electrically connected to the front of one end of the cell body, and the back main grid line is electrically connected to the back of the other end of the cell body;

the front main grid line comprises a first body and a first electrode part, and the first electrode part is electrically connected to the upper surface of the first body;

the back main grid line comprises a second body and a second electrode part, wherein a slot is formed in the second body, and the second electrode part is arranged in the slot and electrically connected with the second body; the first electrode parts of the adjacent photovoltaic cell pieces are inserted into the slots, and the second electrode parts in the slots are electrically connected with the first electrode parts of the adjacent photovoltaic cell pieces;

and an insulating adhesive layer is arranged between the adjacent photovoltaic cell pieces so as to fixedly connect the adjacent photovoltaic cell pieces.

Optionally, the second electrode part is disposed at a bottom of the slot, and a surface of the second electrode part facing away from the cell body is substantially parallel to a top surface of the first electrode part facing away from the cell body.

Optionally, one side of the first electrode part, which is far away from the cell body, is provided with a first sawtooth structure, one side of the second electrode part, which is far away from the cell body, is provided with a second sawtooth structure, and the first sawtooth structure and the second sawtooth structure between the adjacent photovoltaic cells are embedded with each other.

Optionally, the first electrode portion in the photovoltaic cell piece is in interference fit with the slot in the adjacent photovoltaic cell piece.

Optionally, a plurality of first electrode parts are arranged, and the plurality of first electrode parts are arranged at intervals along the length direction of the front main grid line; the number of the slots corresponds to that of the first electrode parts, and one first electrode part is correspondingly inserted into one slot in the adjacent photovoltaic cell.

Optionally, the insulating adhesive layer includes a first adhesive layer located between the adjacent first electrode portions and second adhesive layers located at two ends of the front main gate line.

Optionally, a height of the first electrode portion protruding from the upper surface of the first body ranges from 10 micrometers to 20 micrometers.

Optionally, the width of the first electrode portion is at least greater than the width of the first body.

In a second aspect, an embodiment of the present application further provides a photovoltaic cell, where the photovoltaic cell is used for forming a tiled cell string by stacking, and the photovoltaic cell includes a cell body, a front main grid line and a back main grid line, the cell body is used for converting light energy into electric energy, the front main grid line is electrically connected to a front side of one end of the cell body, and the back main grid line is electrically connected to a back side of the other end of the cell body;

the front main grid line comprises a first body and a first electrode part, and the first electrode part is electrically connected to the upper surface of the first body;

the back main grid line comprises a second body and a second electrode part, wherein a slot is formed in the second body, the second electrode part is arranged in the slot and is electrically connected with the second body, and the slot is used for splicing a first electrode part in the adjacent photovoltaic cell piece so that the first electrode part in the photovoltaic cell piece can be contacted with a second electrode part in the adjacent photovoltaic cell piece;

and the front main grid line and/or the back main grid line are/is provided with an area for arranging an insulating bonding layer so as to be used for bonding the adjacent photovoltaic cell pieces.

In a third aspect, embodiments of the present application further provide a photovoltaic module, which includes at least one of the above-described shingled cell strings or photovoltaic cell sheets.

The embodiment of the application provides a shingled cell string, a photovoltaic cell and a photovoltaic module, wherein, the photovoltaic cell can be through the mode of lamination in order to form the shingled cell string, and the photovoltaic cell includes the cell body that is used for converting light energy into electric energy, and the front main grid line and the back main grid line on the cell body are used for drawing forth the electric current that the cell body produced. In the lamination direction of the photovoltaic cell, the front main grid line is positioned at one end of the cell body, the back main grid line is positioned at one end of the cell body far away from the front main grid line, the front main grid line comprises a first body and a first electrode part, the first electrode part is electrically connected to the upper surface of the first body, the back main grid line comprises a second body and a second electrode part, a slot is arranged on the second body, the second electrode part is arranged in the slot and is electrically connected with the second body, so that when the photovoltaic cell is laminated, the first electrode part in one photovoltaic cell piece can be inserted into the slot in the adjacent photovoltaic cell piece and is contacted with the second electrode part in the slot, the conduction of current between the adjacent photovoltaic battery pieces can be realized through the contact of the first electrode part and the second electrode part, and the fixed connection between the adjacent photovoltaic cell pieces can be strengthened to a certain extent by adopting an inserted structure. Because the first electrode part can realize the electric connection between the first electrode part and the second electrode part when being inserted into the slot and contacted with the second electrode part, the connection between the adjacent photovoltaic cell pieces is realized without adopting conductive adhesive, and an insulating bonding layer can be arranged between the front main grid line and the back main grid line between the adjacent photovoltaic cell pieces, so that the adjacent photovoltaic cell pieces can be fixedly connected after being laminated. The insulating bonding layer is used for bonding, so that the auxiliary material cost caused by the conductive adhesive is reduced, and the manufacturing cost of the laminated cell string is reduced. And the first electrode part and the second electrode part are in physical contact to realize electric connection, so that the electric connection between adjacent photovoltaic cell pieces through conductive adhesive is replaced, the risk of short circuit caused by adhesive overflow of the conductive adhesive can be effectively avoided, the risk of local overheating in the power generation process due to insufficient welding of the conductive adhesive is also avoided, and the yield of the tiled cell string is increased. In addition, due to the matching of the splicing structure and the insulating bonding layer, the area of the laminated sheet can be reduced while the fixing strength is not reduced, and the utilization rate of the photovoltaic cell is increased.

Drawings

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

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

Fig. 1 is a schematic partial structural view of a photovoltaic cell provided in an embodiment of the present application when a front side of the photovoltaic cell is upward.

Fig. 2 is a partial cross-sectional view of the photovoltaic cell sheet shown in fig. 1 at the front major grid line.

Fig. 3 is a schematic partial structure diagram of a photovoltaic cell sheet provided in the embodiment of the present application when the back side faces upward.

Fig. 4 is a partial cross-sectional view of the photovoltaic cell shown in fig. 3 at the back bus bar.

Fig. 5 is a schematic structural diagram of a shingle battery string according to an embodiment of the present application.

Figure 6 is a partial cross-sectional view of a shingled battery string at an overlap provided by an embodiment of the present application.

Fig. 7 is a partial cross-sectional view of a photovoltaic cell sheet provided in accordance with another embodiment of the present application at a front side busbar.

Fig. 8 is a partial cross-sectional view of a photovoltaic cell sheet provided in accordance with another embodiment of the present application at a back side busbar.

Reference numerals:

100. a shingled battery string;

10. a photovoltaic cell sheet; 11. a cell body; 12. a front side main gate line; 121. a first electrode section; 1211. a top surface; 1212. a first saw-tooth structure; 122. a first body; 13. a back side main grid line; 131. a slot; 132. a second electrode section; 1321. a second saw-tooth structure; 133. a second body; 14. a front side secondary grid line; 15. and a back side secondary grid line.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without inventive step, are within the scope of the present application.

Reference herein to "an embodiment" or "an implementation" means that a particular feature, component, or characteristic described in connection with the embodiment or implementation can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.

The embodiment of the application provides a photovoltaic cell piece, a laminated tile battery string and a photovoltaic module, and aims to solve the problem that the reject ratio of the photovoltaic cell piece is high after the laminated tile battery string is manufactured. This will be explained below with reference to the drawings.

Referring to fig. 1 to 5, fig. 1 is a partial structure schematic view of a photovoltaic cell provided in an embodiment of the present application when a front surface of the photovoltaic cell is upward, fig. 2 is a partial cross-sectional view of the photovoltaic cell shown in fig. 1 at a front main grid line, fig. 3 is a partial structure schematic view of the photovoltaic cell provided in the embodiment of the present application when a back surface of the photovoltaic cell is upward, fig. 4 is a partial cross-sectional view of the photovoltaic cell shown in fig. 3 at a back main grid line, and fig. 5 is a structure schematic view of a shingle battery string provided in the embodiment of the present application. The photovoltaic cell sheet 10 provided by the embodiment of the present application can be used to make a shingled cell string 100, such as a plurality of photovoltaic cell sheets 10 can be stacked to form the shingled cell string 100. The photovoltaic cell piece 10 comprises a cell piece body 11, a front main grid line 1 and a back main grid line 13, wherein the cell piece body 11 is used for converting light energy into electric energy. It is understood that the cell body 11 may be made of a semiconductor material, such as a P-type silicon wafer, and a P-N junction is formed after phosphorus diffusion. After the semiconductor structure absorbs solar energy, the semiconductor structure is excited to generate electron and hole pairs, the electron and hole pairs are separated by a P-N junction self-establishing electric field in the semiconductor, electrons flow into the N region, holes flow into the P region, and a photo-generated electric field is formed. Generally, the cell body 11 is a sheet structure, one side capable of absorbing light energy and converting the light energy into electric energy is called a light absorbing side or a front side, the other side is called a back side, and of course, the other cell body 11 can also absorb and convert light energy into electric energy, and such a cell is called a double-sided cell. In the embodiment of the present application, when the battery cell body 11 is mounted in normal use, the side facing upward is referred to as a front side, and the other side facing the front side is referred to as a back side.

The front side of the battery piece body 11 is electrically connected with the front side main grid lines 12, and the back side of the battery piece body 11 is electrically connected with the back side main grid lines 13, and it can be understood that the front side main grid lines 12 and the back side main grid lines 13 on the battery piece body 11 are used for leading out the current generated by the battery piece body 11. The front main grid lines 12 and the back main grid lines 13 can be arranged on the cell body 11 by screen printing. It can also be understood that the front side of the cell body 11 may further be provided with front side minor grid lines 14, the front side minor grid lines 14 are electrically connected with the front side major grid lines 12, and the front side minor grid lines 14 are used for collecting current to the front side major grid lines 12. The back side of the cell body 11 can also be provided with a back side auxiliary grid line 15, the back side auxiliary grid line 15 is electrically connected with the back side main grid line 13, and the back side auxiliary grid line 15 is used for collecting current to the back side main grid line 13.

Wherein a plurality of photovoltaic cells 10 can be stacked to form a shingled cell string 100, as shown in fig. 5. It is understood that the lamination means that a plurality of photovoltaic cell sheets 10 are sequentially stacked in a length direction or a width direction of the photovoltaic cell sheet 10, and the overlapped portion is a small portion of the end portion of the photovoltaic cell sheet 10. The front main grid line 12 is electrically connected to the front of one end of the cell body 11, and the back main grid line 13 is electrically connected to the back of the other end of the cell body 11, or it can be understood that, in the stacking direction H1 of the photovoltaic cell 10, the front main grid line 12 is located at one end of the cell body 11, and the back main grid line 13 is located at one end of the cell body 11 far away from the front main grid line 12, that is, the front main grid line 12 and the back main grid line 13 are respectively located at two ends of the cell body 11, so that when the photovoltaic cell 10 is stacked, the front main grid line 12 of one end of the cell body 11 of the photovoltaic cell 10 can be electrically connected to the back main grid line 13 of one end of the cell body 11 in the adjacent photovoltaic cell 10, thereby realizing current conduction after the photovoltaic cell 10 is stacked.

For illustration of three photovoltaic cells, when three photovoltaic cells 10 are stacked, as shown in fig. 5, the three photovoltaic cells 10 are named a first cell 10a, a second cell 10b and a third cell 10c, respectively. One side of the first battery piece 10a is placed below the second battery piece 10b and is partially overlapped and fixed together, so that the front main grid lines 12a of the first battery piece 10a can be electrically connected with the back main grid lines 13b of the second battery piece 10 b. Meanwhile, the third cell piece 10c is placed under the first cell piece 10a and is partially stacked and fixed together, so that the front side major grid lines 12c of the third cell piece 10c are electrically connected with the back side major grid lines 13a of the first cell piece 10a, and according to the same method, a plurality of photovoltaic cell pieces can be sequentially interconnected to form the shingle cell string 100.

It should be noted that, in the related art, the shingle connection between the photovoltaic cells is achieved by the conductive adhesive, that is, the fixed connection and the electrical conduction between the photovoltaic cells need to be achieved by the conductive adhesive. The connection mode of the conductive adhesive has the risk of glue overflow short circuit, and the conductive adhesive is easy to produce cold joint due to equipment fluctuation in the actual process use process, the resistance of the cold joint is larger after electrification, the temperature is higher when current passes through, the risk of burning is caused, and the reject ratio is higher. In addition, the conductive adhesive component contains silver with a high proportion, so the overall cost is higher.

Based on this, please refer to fig. 6 in combination with fig. 1 to 4, fig. 6 is a partial cross-sectional view of a stack cell string at an overlapping portion according to an embodiment of the present application. In the photovoltaic cell 10 provided by the embodiment of the application, the front main grid line 12 includes a first electrode portion 121 and a first body 122, and the first electrode portion 121 is electrically connected to the upper surface of the first body 122, it can be understood that the upper surface of the front main grid line 12 refers to a surface away from the cell body 11. The back main grid line 13 includes a second electrode portion 132 and a second body 133, the second body 133 is provided with a slot 131, and the second electrode portion 132 is disposed in the slot 131 and electrically connected to the second body 133. The inserting groove 131 is used for inserting the first electrode part 121 in the adjacent photovoltaic cell piece 10, so that the first electrode part 121 in the photovoltaic cell piece 10 can be in contact with the second electrode part 132 in the adjacent photovoltaic cell piece 10. The front main grid line 12 and/or the back main grid line 13 are provided with an area a for arranging an insulating bonding layer, and the area for arranging the insulating bonding layer is provided with an insulating bonding layer such as insulating glue, so that the fixed connection between the adjacent photovoltaic cell pieces 10 can be realized.

It can be understood that, in the laminated cell string 100, the laminated cell string 100 includes at least two photovoltaic cell sheets 10 as above, one end of each photovoltaic cell sheet 10 having the slot 131 is stacked on one end of the adjacent photovoltaic cell sheet 10 having the first electrode portion 121, so that the first electrode portion 121 of each photovoltaic cell sheet 10 is inserted into the slot 131 of the adjacent photovoltaic cell sheet 10 and contacts with the second electrode portion 132 of the slot 131, and an insulating adhesive layer is disposed between the adjacent photovoltaic cell sheets 10 to fixedly connect the adjacent photovoltaic cell sheets 10.

In order to improve the bonding strength between the adjacent photovoltaic cell pieces 10, the first electrode part 121 in the photovoltaic cell piece 10 may be in interference fit with the slot 131 in the adjacent photovoltaic cell piece 10.

When the photovoltaic cell pieces 10 are laminated, the first electrode part 121 of one photovoltaic cell piece 10 can be inserted into the insertion groove 131 of the adjacent photovoltaic cell piece 10 and is in contact with the second electrode part 132 in the insertion groove 131, the conduction of current between the adjacent photovoltaic cell pieces 10 can be realized through the contact of the first electrode part 121 and the second electrode part 132, and the fixed connection between the adjacent photovoltaic cell pieces 10 can be strengthened to a certain extent by adopting an inserted structure. Since the first electrode part 121 is inserted into the slot 131 and contacts the second electrode part 132, the first electrode part 121 and the second electrode part 132 can be electrically connected, and therefore, an insulating adhesive layer can be arranged between the front main grid line 12 and the back main grid line 13 between the adjacent photovoltaic cell pieces 10 without using a conductive adhesive to electrically connect the adjacent photovoltaic cell pieces 10, so that the adjacent photovoltaic cell pieces 10 can be fixedly connected after being laminated. The insulating bonding layer is used for bonding, so that the auxiliary material cost caused by the conductive adhesive is reduced, and the manufacturing cost of the laminated cell string 100 is reduced. In addition, the first electrode part 121 and the second electrode part 132 are in physical contact to realize electrical connection, so that the electrical connection between the adjacent photovoltaic cell pieces 10 through conductive adhesive is replaced, the risk of short circuit caused by adhesive overflow of the conductive adhesive can be effectively avoided, the risk of local overheating in the power generation process due to insufficient welding of the conductive adhesive is also avoided, and the yield of the tiled cell string 100 is increased. Moreover, due to the matching of the splicing structure and the insulating bonding layer, the area of the laminated sheet can be reduced without reducing the fixing strength, and the utilization rate of the photovoltaic cell 10 is increased.

The second electrode part 132 is disposed at the bottom of the slot 131, and the surface of the second electrode part 132 facing away from the cell body 11 is substantially parallel to the top surface 1211 of the first electrode part 121 facing away from the cell body 11. In this way, when one of the photovoltaic cell sheets 10 is stacked on the adjacent photovoltaic cell sheet 10, the top surface 1211 of the first electrode portion 121 in the photovoltaic cell sheet 10 can better contact with the second electrode portion 132 in the adjacent photovoltaic cell sheet 10, so as to realize the electrical conduction between the first electrode portion 121 and the second electrode portion 132.

It is understood that the second electrode portion 132 may be disposed on the side wall of the slot 131, as long as the first electrode portion 121 can be electrically connected to the second electrode portion 132 well when the first electrode portion 121 is inserted into the slot 131. In the embodiment of the present application, as shown in fig. 4, in order to facilitate the installation of the second electrode portion 132, the second electrode portion 132 is installed at the bottom of the slot 131, and it can be understood that the upper surface of the second electrode portion 132 is the bottom of the slot 131. It is understood that the second electrode portion 132 is electrically connected to the back bus bar 13.

The front main gate line 12, the first electrode part 121, the back main gate line 13 having the slot 131, and the second electrode part 132 may be formed by screen printing. For example, when the front main grid line 12 and the first electrode part 121 are manufactured, the first body 122 of the front main grid line 12 may be screen-printed on the front surface of the cell body 11, and then the first body 122 is screen-printed at a position where the first electrode part 121 needs to be disposed, so as to form the first electrode part 121 protruding from the upper surface of the front main grid line 12. When the back main grid line 13 with the slot 131 and the second electrode portion 132 are manufactured, the first electrode portion 121 with a preset thickness may be printed on the back surface of the cell body 11 by screen printing, and then the second body 133 with a thickness higher than that of the second electrode portion 132 may be printed, so as to form a structure in which the second electrode portion 132 is disposed in the slot 131. It can be understood that the screen used for printing the back main gate line 13 is not hollowed at the position corresponding to the second electrode portion 132, and the second electrode portion 132 is on the printing path of the back main gate line 13, so that when the back main gate line 13 is printed, a slot structure can be formed at the position corresponding to the second electrode portion 132.

The first body 122 and the second body 133 may be made of silver paste or aluminum paste, and the first electrode portion 121 and the second electrode portion 132 may be made of silver paste. Preferably, the first body 122, the second body 133, the first electrode part 121, and the second electrode part 132 are made of silver paste, so that the first body 122, the second body 133, the first electrode part 121, and the second electrode part 132 have better conductive effects.

In order to improve the strength of the first electrode part 121 inserted into the insertion slot 131 and to achieve effective electrical conduction, the height L of the first electrode part 121 protruding from the upper surface of the first body 122 may be set to be in a range of 10 micrometers to 20 micrometers, such as 15 micrometers.

As shown in fig. 1, an orthographic projection of the first electrode portion 121 on the front main grid line 12 at least covers an area in a width direction of the front main grid line 12, and with reference to a viewing angle in fig. 1, a width D of the first electrode portion 121 is at least greater than a width D of the first body 122, and preferably, the width D of the first electrode portion 121 is greater than the width D of the first body 122, so that a contact area between the first electrode portion 121 and the second electrode portion 132 can be effectively increased, and an electrical conduction effect between the first electrode portion 121 and the second electrode portion 132 is better.

In some embodiments, referring to fig. 7 and 8, fig. 7 is a partial cross-sectional view of a photovoltaic cell provided in another embodiment of the present application at a front side bus bar, and fig. 8 is a partial cross-sectional view of a photovoltaic cell provided in another embodiment of the present application at a back side bus bar. In order to improve the connection strength and the conductive effect between the adjacent photovoltaic cell pieces 10, a first sawtooth structure 1212 may be disposed on the top surface of the first electrode part 121 (i.e., a surface of the first electrode part 121 facing away from the cell piece body 11), a second sawtooth structure 1321 may be disposed on a surface of the second electrode part 132 facing away from the cell piece body 11, and when a plurality of photovoltaic cell pieces 10 are stacked, the first sawtooth structure 1212 and the second sawtooth structure 1321 between the adjacent photovoltaic cell pieces 10 can be embedded with each other. Through the mutual embedding of the first sawtooth structures 1212 and the second sawtooth structures 1321, not only the connection strength is improved, but also the contact area is increased, so that the conductive effect between the first electrode part 121 and the second electrode part 132 is better. It is understood that the mutual engagement between the first and second saw tooth structures 1212 and 1321 means that the teeth of the first saw tooth structure 1212 can be inserted between the teeth of the second saw tooth structure 1321, and it is also understood that the teeth of the second saw tooth structure 1321 can be inserted between the teeth of the first saw tooth structure 1212.

It is understood that the first electrode part 121 may be provided in plurality, and the plurality of first electrode parts 121 are provided at intervals along the length direction of the front bus bar 12. The number of the slots 131 corresponds to the number of the first electrode portions 121, the slots 131 are arranged at intervals along the length direction of the back busbar 13, the interval distance between adjacent slots 131 is the same as the interval distance between adjacent first electrode portions 121, and a second electrode portion 132 is correspondingly arranged in each slot 131, so that when a plurality of photovoltaic cells 10 are stacked, the first electrode portion 121 in one photovoltaic cell 10 can be correspondingly inserted into the slot 131 in the adjacent photovoltaic cell 10 and is in contact with the second electrode portion 132 in the slot 131. By providing the plurality of first electrode parts 121, the plurality of slots 131, and the plurality of second electrode parts 132, the connection strength and the electrical conduction between the adjacent photovoltaic cell sheets 10 can be further improved.

The region on the front main gate line 12 for providing the insulating adhesive layer includes a first region located between adjacent first electrode portions 121 and second regions located at two ends of the front main gate line 12. In this way, the bonding strength between the adjacent photovoltaic cell pieces 10 can be ensured. It is understood that when the first electrode portion 121 is provided in plural, the area a for providing the insulating adhesive layer is also provided in plural correspondingly, and plural insulating adhesive areas a are formed. It is also understood that the insulating adhesive layer region is a region for disposing an insulating adhesive layer such as an insulating paste, and in the shingled battery string 100, the adjacent photovoltaic battery pieces 10 are fixedly connected by disposing the insulating adhesive layer therebetween, and at this time, the insulating adhesive layer includes a first adhesive layer between the adjacent first electrode portions 121 and second adhesive layers at both ends of the front main grid line 12.

On the other hand, the embodiment of the present application further provides a photovoltaic module, it can be understood that the photovoltaic module includes at least one of the above shingle cell strings 100, and it can be understood that each shingle cell string 100 may be electrically connected in parallel or in series, and may be specifically configured according to actual needs.

It should be noted that the terms "first", "second", and the like in the description and claims of the present application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order, and are not intended to indicate or imply relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The photovoltaic cell, the shingled cell string and the photovoltaic module provided in the embodiments of the present application are described in detail above, and specific examples are applied herein to explain the principles and embodiments of the present application, and the description of the above embodiments is only used to help understand the method and the core ideas of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A shingled cell string comprising at least two photovoltaic cells;

each photovoltaic cell comprises a cell body, a front main grid line and a back main grid line, wherein the front main grid line is electrically connected to the front of one end of the cell body, and the back main grid line is electrically connected to the back of the other end of the cell body;

the front main grid line comprises a first body and a first electrode part, and the first electrode part is electrically connected to the upper surface of the first body;

the back main grid line comprises a second body and a second electrode part, wherein a slot is formed in the second body, and the second electrode part is arranged in the slot and electrically connected with the second body; the first electrode parts of the adjacent photovoltaic cell pieces are inserted into the slots, and the second electrode parts in the slots are electrically connected with the first electrode parts of the adjacent photovoltaic cell pieces;

and an insulating adhesive layer is arranged between the adjacent photovoltaic cell pieces so as to fixedly connect the adjacent photovoltaic cell pieces.

2. The shingle battery string according to claim 1, wherein the second electrode portion is disposed at the bottom of the slot, and a surface of the second electrode portion facing away from the cell body is substantially parallel to a top surface of the first electrode portion facing away from the cell body.

3. The shingled cell string according to claim 2, wherein a first sawtooth structure is disposed on a side of the first electrode part facing away from the cell body, a second sawtooth structure is disposed on a side of the second electrode part facing away from the cell body, and the first sawtooth structure and the second sawtooth structure between the adjacent photovoltaic cells are embedded with each other.

4. The string of shingled cells according to claim 1, wherein the first electrode portion of the photovoltaic cell piece is an interference fit with the slot of the adjacent photovoltaic cell piece.

5. The laminated cell string according to claim 1, wherein a plurality of the first electrode portions are provided, and the plurality of the first electrode portions are provided at intervals along a length direction of the front main grid line; the number of the slots corresponds to that of the first electrode parts, and one first electrode part is correspondingly inserted into one slot in the adjacent photovoltaic cell.

6. The string of stacked cells according to claim 5, wherein the insulating adhesive layer comprises a first adhesive layer between adjacent first electrode portions and a second adhesive layer at both ends of the front busbar.

7. The string of stacked cells according to claim 1, wherein the height of the first electrode portion protruding from the upper surface of the first body ranges from 10 microns to 20 microns.

8. The shingle battery string according to claim 1, wherein the first electrode portion has a width at least greater than a width of the first body.

9. A photovoltaic cell piece is used for forming a laminated cell string in a laminating mode and is characterized by comprising a cell piece body, a front main grid line and a back main grid line, wherein the cell piece body is used for converting light energy into electric energy, the front main grid line is electrically connected to the front of one end of the cell piece body, and the back main grid line is electrically connected to the back of the other end of the cell piece body;

the front main grid line comprises a first body and a first electrode part, and the first electrode part is electrically connected to the upper surface of the first body;

the back main grid line comprises a second body and a second electrode part, wherein a slot is formed in the second body, the second electrode part is arranged in the slot and is electrically connected with the second body, and the slot is used for splicing a first electrode part in the adjacent photovoltaic cell piece so that the first electrode part in the photovoltaic cell piece can be contacted with a second electrode part in the adjacent photovoltaic cell piece;

and the front main grid line and/or the back main grid line are/is provided with an area for arranging an insulating bonding layer so as to be used for bonding the adjacent photovoltaic cell pieces.

10. A photovoltaic module comprising at least one string of shingled cells according to any of claims 1 to 8 or a photovoltaic cell sheet according to claim 9.

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