CN217881524U - Cell, solar cell string and solar cell module - Google Patents

Abstract

The application provides a battery piece, solar cell cluster and solar module, belongs to the photovoltaic field. The cell comprises an amorphous silicon p layer, a p-type doped side amorphous silicon i layer, a silicon base layer, an n-type doped side amorphous silicon i layer and an amorphous silicon n layer which are sequentially arranged in the thickness direction of the cell, wherein TCO layers are arranged on the surfaces of the amorphous silicon p layer and the amorphous silicon n layer; wherein, the two ends of the TCO layers on the front surface and the back surface are distributed with insulating parts. The cell can effectively solve the problem that the welding strip is easy to form conductive connection with the TCO on the other side of the cell in a lap joint mode by distributing the insulating parts at the two ends of the TCO layer.

Description

Cell, solar cell string and solar cell module

Technical Field

The application relates to the field of photovoltaics, in particular to a cell, a solar cell string and a solar cell module.

Background

The crystalline silicon heterojunction solar cell integrates the advantages of the stability of crystalline silicon and the wide band gap of amorphous silicon materials, greatly improves the open-circuit voltage of the cell, improves the conversion efficiency of the crystalline silicon cell, and gradually becomes the mainstream in the market.

When manufacturing a solar cell module, a plurality of cell pieces are generally connected into a cell string by welding with solder strips, and then the cell string is laid between glass and a back plate and connected in series with bus bars, and then lamination and framing are performed. In the crystalline silicon heterojunction solar cell, TCO layers (transparent conducting layers) are arranged on the front surface and the back surface of a cell piece, and for a product obtained by the existing welding process, a welding strip is easily lapped with the TCO on the other side of the cell piece to form conductive connection in the laminating process, so that a cell assembly is easily short-circuited and fails.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a cell, a solar cell string and a solar cell module, which can effectively solve the problem that a solder strip is easily connected with a TCO (transparent conductive oxide) on the other side of the cell in a lap joint manner to form conductive connection.

The embodiment of the application is realized as follows:

in a first aspect, an embodiment of the application provides a battery piece, which includes an amorphous silicon p layer, a p-type doped side amorphous silicon i layer, a silicon base layer, an n-type doped side amorphous silicon i layer and an amorphous silicon n layer, which are sequentially arranged from top to bottom along a thickness direction of the battery piece, wherein TCO layers are arranged on the surfaces of the amorphous silicon p layer and the amorphous silicon n layer; wherein, the two ends of the TCO layers on the front surface and the back surface are distributed with insulating parts.

In the technical scheme, the insulating parts are distributed at the head end and the tail end of the TCO layer, so that the battery piece corresponds to the welding strip through the insulating parts at the edge positions of the two sides of the battery piece, the insulating parts are arranged between the TCO layer and the welding strip at intervals, and the electric contact and even connection between the welding strip (the surface of the welding strip and conductive materials such as tin balls possibly generated in the laminating process of the welding strip) and the TCO of the other side can be effectively avoided, so that the problem that the welding strip is easily connected with the TCO on the other side of the battery piece in a conductive manner can be effectively solved.

In some possible embodiments, the insulating portion extends from the surface of the cell sheet to be aligned with the bottom surface of the TCO layer in the thickness direction of the cell sheet.

In the technical scheme, in the thickness direction of the cell, the insulating part extends to be aligned with the bottom surface of the TCO layer, and the insulating part corresponds to the whole TCO layer in the thickness direction, so that the insulating part can be well electrically isolated between the TCO layer and the welding strip; furthermore, no changes need to be made to the layer structure other than the TCO layer.

In some possible embodiments, the insulating portion extends from the surface of the cell piece to be aligned with the surface of the silicon base layer in the thickness direction of the cell piece.

Among the above-mentioned technical scheme, in the thickness direction of battery piece, insulating part extends to and aligns with the surface of silicon substrate, and insulating part has bigger distribution range on thickness direction for insulating part can carry out electric isolation between TCO layer and solder strip betterly, wherein, for example when insulating part sets up to the recess form, can provide bigger space deposit tin pearl, thereby can more effectively avoid tin pearl to spill over the back and the TCO overlap joint of opposite side forms conductive connection.

In some possible embodiments, the TCO layer has a plurality of insulating portions distributed at each end, and the plurality of insulating portions are spaced apart along the extending direction of the corresponding edge.

In the technical scheme, the insulating parts are distributed at intervals at each end, so that the welding strip can be conveniently and quickly and accurately positioned when being connected; and the TCO layer has larger distribution area, and can better cover the surface of the cell to play a role.

In some possible embodiments, the TCO layer has a number of insulating sites in each end of 2 to 30.

Among the above-mentioned technical scheme, insulating position has suitable quantity, and the battery piece of being convenient for matches the solder strip of suitable quantity and carries out the series connection.

In some possible embodiments, the insulation site is an insulation groove.

In the technical scheme, the groove form can be conveniently prepared by a mask method and other modes.

In some possible embodiments, the insulating site is a layer of insulating material.

In the technical scheme, the insulating material layer can be more effectively electrically isolated between the TCO layer and the solder strip.

In a second aspect, an embodiment of the present application provides a solar cell string, including: the battery comprises a plurality of battery pieces and a plurality of welding strips, wherein the battery pieces are distributed side by side along a first preset direction; two adjacent battery pieces are connected through a welding strip, and the welding strip corresponds to the insulation part.

In some possible embodiments, the solder strip is a low temperature solder strip having a melting point below 150 ℃.

In a third aspect, embodiments of the present application provide a solar cell module, including a solar cell string as in the above embodiments.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a solar cell string in the prior art;

fig. 2 is a schematic side view of a solar cell string according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a solar cell string on a surface according to an embodiment of the present disclosure.

Fig. 4 is a schematic side view of a first structure of a battery cell provided in an embodiment of the present application;

fig. 5 is a schematic side view of a battery cell according to an embodiment of the present disclosure;

fig. 6 is a schematic side view of a third structure of a battery cell according to an embodiment of the present disclosure;

fig. 7 is a schematic side view of a fourth structure of a battery cell according to an embodiment of the present disclosure;

fig. 8 is a schematic view of a first structure of a battery cell on a surface according to an embodiment of the present disclosure;

fig. 9 is a schematic diagram of a second structure of a battery cell on a surface according to an embodiment of the present disclosure.

Icon:

10-a solar cell string;

100-battery piece; 110-amorphous silicon p-layer; a 120-p type doped side amorphous silicon i layer; 130-a silicon base layer; 140-n type doped side amorphous silicon i layer; 150-amorphous silicon n-layer; 160-TCO layer; 170-insulating site;

200-welding a strip; 210-tin beads;

a-thickness direction of the cell; b-a first preset direction; c-a second predetermined direction.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

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.

In the description of the present application, it is to be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the application are used, and are only used for convenience in describing the application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "perpendicular", "parallel", and the like do not require that the components be absolutely perpendicular or parallel, but may be slightly inclined.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, 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; 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 application can be understood in a specific case by those of ordinary skill in the art.

At present, for a heterojunction solar cell, due to the characteristics of the cell itself, in order to protect the heterojunction cell 100, soldering is generally performed by using a low-temperature solder strip 200 for low-temperature soldering, and in the use process of the low-temperature solder strip 200 (the melting point is lower than 150 ℃), tin is also generally melted in the lamination process, so that a better contact effect with a grid line is achieved.

The applicant has noted that during the lamination process, as shown in fig. 1, solder melting tends to form a bead 210 or the like that overlaps the other side of the cell, causing short-circuit failure of the cell sheet 100 and thus degradation of waste.

Based on this, the embodiments of the present application provide a cell sheet 100, a solar cell string 10 and a solar cell module, and some exemplary descriptions will be made below on the technical solutions of the present application with reference to the drawings and the detailed description.

A solar cell module comprising a solar cell string 10 as shown in fig. 2 and 3.

The solar cell string 10 includes a plurality of cells 100 and a plurality of solder strips 200, the cells 100 are distributed side by side along a first preset direction B, the first preset direction B is perpendicular to a thickness direction a of the cells, and two adjacent cells 100 are connected by the solder strips 200.

The cell piece 100 comprises an amorphous silicon p layer 110, a p-type doped side amorphous silicon i layer 120, a silicon base layer 130, an n-type doped side amorphous silicon i layer 140 and an amorphous silicon n layer 150 which are arranged from top to bottom in sequence along the thickness direction A of the cell piece, and TCO layers 160 are arranged on the surfaces of the amorphous silicon p layer 110 and the amorphous silicon n layer 150. The amorphous silicon p layer 110 is a p-type doped amorphous silicon layer, the amorphous silicon i layer is an intrinsic amorphous silicon layer, and the amorphous silicon n layer 150 is an n-type doped amorphous silicon layer.

In the cell sheet 100 of the application example, the insulating portions 170 are distributed on both ends of the front and back TCO layers 160, that is, the insulating portions 170 are distributed on both ends of the TCO layers 160 in the direction in which the cell sheets 100 are distributed side by side, that is, the insulating portions 170 are distributed on both side edges of the front and back TCO layers 160 in the first predetermined direction B.

In the solar cell string 10 of the application example, the solder ribbon 200 corresponds to the insulating portion 170. That is, the battery piece 100 contacts or matches with the solder strip 200 through the insulating portion 170 at the end and the end in the first predetermined direction B.

In the technical scheme provided by the application, the insulating parts 170 are distributed at the head end and the tail end of the TCO layer 160, so that at the edge positions of the two sides of the battery piece 100, the battery piece 100 corresponds to the solder strip 200 through the insulating parts 170, the insulating parts 170 are spaced between the TCO layer 160 and the solder strip 200, and the solder strip 200 (the surface of the solder strip 200 and conductive materials such as tin beads 210 which may be generated during the lamination process of the solder strip 200) and the TCO on the other side can be effectively prevented from being electrically contacted or even connected, so that the problem that the solder strip 200 is easily lapped with the TCO on the other side of the battery piece 100 to form conductive connection can be effectively solved.

In the present application, the type of the solder strip 200 may be selected as desired.

In some possible embodiments, the solder strip 200 is a low temperature solder strip 200 with a melting point below 150 ℃, which ensures that the solar cell string 10 can be better applied to a low temperature soldering process.

In the present application, the composition of the insulating portion 170 is not limited, and may be in the form of a groove or an insulating layer.

Referring to fig. 4 and 5, in some possible embodiments, the insulation site 170 is an insulation groove. In this configuration, the front and rear ends of the surface of the battery piece 100 in the first predetermined direction B are stepped.

In the technical scheme, the groove form can be conveniently prepared by a mask method and other modes.

Referring to fig. 6 and 7, in some possible embodiments, the insulating region 170 is a layer of insulating material.

In the above embodiments, the insulating material layer is formed to more effectively electrically isolate the TCO layer 160 from the solder ribbon 200.

In the present application, the distribution range of the insulating portion 170 in the thickness direction a of the battery piece is not limited, and may be selected according to welding standards, a manufacturing process of the battery piece 100, and the like.

Referring to fig. 4 and 6, in the thickness direction a of the cell sheet, the insulating portion 170 extends from the surface of the cell sheet 100 to align with the bottom surface of the TCO layer 160. Wherein the bottom surface of the TCO layer 160 is the side of the TCO layer 160 close to the silicon substrate 130.

In the above technical solution, in the thickness direction a of the cell, the insulating portion 170 extends to be aligned with the bottom surface of the TCO layer 160, and the insulating portion 170 corresponds to the whole TCO layer 160 in the thickness direction, so that the insulating portion 170 can better perform electrical isolation between the TCO layer 160 and the solder strip 200; moreover, no changes need to be made to the layer structure other than the TCO layer 160.

Referring to fig. 5 and 7, the insulating portion 170 extends from the surface of the battery chip 100 to be aligned with the surface of the silicon base layer 130 in the thickness direction a of the battery chip. It is understood that when the insulating portion 170 is a solid insulating material layer, the side of the insulating portion 170 away from the silicon substrate 130 can be aligned with the surface of the TCO layer 160 (i.e., the side of the TCO layer 160 away from the silicon substrate 130) or can extend beyond the surface of the TCO layer 160.

In the above technical solution, in the thickness direction a of the battery piece, the insulation portion 170 extends to be aligned with the surface of the silicon-based layer 130, and the insulation portion 170 has a larger distribution range in the thickness direction, so that the insulation portion 170 can better perform electrical isolation between the TCO layer 160 and the solder strip 200, wherein, for example, when the insulation portion 170 is set in a groove form, a larger space can be provided for depositing the tin bead 210, and thus, the tin bead 210 can be more effectively prevented from overflowing and then overlapping with the TCO on the other side to form a conductive connection.

It should be noted that a plurality of solder strips 200 are generally distributed in the battery string, and in the present application, as shown in fig. 3 and 8, a plurality of insulating portions 170 may be arranged on each side in the first preset direction B, and correspond to the plurality of solder strips 200 one by one through the plurality of insulating portions 170; as shown in fig. 9, the insulating portion 170 on each side in the first predetermined direction B may be disposed one by one, and corresponds to the plurality of solder ribbons 200 through the plurality of insulating portions 170.

Referring to fig. 8, in some possible embodiments, a plurality of insulating portions 170 are distributed at each end of the TCO layer 160 in the first predetermined direction B, and the plurality of insulating portions 170 are distributed at intervals along a second predetermined direction C corresponding to the extending direction of the edge, i.e. the longitudinal direction of the cell 100, which is defined as the second predetermined direction C in this application, and the second predetermined direction C is perpendicular to the first predetermined direction B and the thickness direction a of the cell.

In the above technical solution, the insulation portions 170 are distributed at intervals at each end, so that the solder strip 200 can be conveniently and accurately positioned when connected; the TCO layer 160 has a larger distribution area, and the TCO layer 160 can better cover the surface of the cell 100 to function.

By way of example, the TCO layer 160 has a number of insulating sites 170 in each end of 2 to 30, such as, but not limited to, 2, 5, 10, 15, 20, 25, and 30.

In the above technical solution, the number of the insulation portions 170 is suitable, so that the battery pieces 100 can be conveniently matched with the number of the solder strips 200 to be connected in series.

The technical solutions of the present application will be described below with reference to the accompanying drawings and specific embodiments.

Example 1

A battery sheet 100 is shown in FIG. 4.

The cell 100 comprises an amorphous silicon p layer 110, a p-type doped side amorphous silicon i layer 120, a silicon base layer 130, an n-type doped side amorphous silicon i layer 140 and an amorphous silicon n layer 150 which are sequentially arranged in the thickness direction A of the cell, wherein TCO layers 160 are arranged on the surfaces of the amorphous silicon p layer 110 and the amorphous silicon n layer 150; the TCO layer 160 is distributed with insulating portions 170 at both ends in the first predetermined direction B, and the distribution pattern of the insulating portions 170 on the surface of the cell 100 is shown in fig. 8.

In this embodiment, the insulation portion 170 is an insulation groove. In the thickness direction a of the cell, the insulating portion 170 extends from the surface of the cell 100 to be aligned with the bottom surface of the TCO layer 160.

Example 2

A battery sheet 100 is shown in FIG. 5.

The cell piece 100 comprises an amorphous silicon p layer 110, a p-type doped side amorphous silicon i layer 120, a silicon base layer 130, an n-type doped side amorphous silicon i layer 140 and an amorphous silicon n layer 150 which are sequentially arranged in the thickness direction A of the cell piece, and TCO layers 160 are arranged on the surfaces of the amorphous silicon p layer 110 and the amorphous silicon n layer 150; the TCO layer 160 is distributed with insulating portions 170 at both ends in the first predetermined direction B, and the distribution pattern of the insulating portions 170 on the surface of the cell 100 is shown in fig. 8.

In this embodiment, the insulation portion 170 is an insulation groove. The insulating portion 170 extends from the surface of the battery chip 100 to be aligned with the surface of the silicon base layer 130 in the thickness direction a of the battery chip.

Example 3

A battery piece 100 having a side structure as shown in fig. 6.

The cell piece 100 comprises an amorphous silicon p layer 110, a p-type doped side amorphous silicon i layer 120, a silicon base layer 130, an n-type doped side amorphous silicon i layer 140 and an amorphous silicon n layer 150 which are sequentially arranged in the thickness direction A of the cell piece, and TCO layers 160 are arranged on the surfaces of the amorphous silicon p layer 110 and the amorphous silicon n layer 150; the TCO layer 160 is distributed with insulating portions 170 at both ends in the first predetermined direction B, and the distribution pattern of the insulating portions 170 on the surface of the cell 100 is shown in fig. 8.

In this embodiment, the insulating portion 170 is an insulating material layer. In the thickness direction a of the cell, the insulating portion 170 extends from the surface of the cell 100 to be aligned with the bottom surface of the TCO layer 160.

Example 4

A battery sheet 100 is shown in FIG. 7 in a side view.

The cell piece 100 comprises an amorphous silicon p layer 110, a p-type doped side amorphous silicon i layer 120, a silicon base layer 130, an n-type doped side amorphous silicon i layer 140 and an amorphous silicon n layer 150 which are sequentially arranged in the thickness direction A of the cell piece, and TCO layers 160 are arranged on the surfaces of the amorphous silicon p layer 110 and the amorphous silicon n layer 150; the TCO layer 160 is distributed with insulating portions 170 at both ends in the first predetermined direction B, and the distribution pattern of the insulating portions 170 on the surface of the cell 100 is shown in fig. 8.

In this embodiment, the insulating portion 170 is an insulating material layer. The insulating portion 170 extends from the surface of the battery chip 100 to be aligned with the surface of the silicon base layer 130 in the thickness direction a of the battery chip.

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

Claims (10)

1. The cell is characterized by comprising an amorphous silicon p layer, a p-type doped side amorphous silicon i layer, a silicon base layer, an n-type doped side amorphous silicon i layer and an amorphous silicon n layer which are sequentially arranged from top to bottom along the thickness direction of the cell, wherein TCO layers are arranged on the surfaces of the amorphous silicon p layer and the amorphous silicon n layer;

wherein, the two ends of the TCO layer on the front surface and the back surface are distributed with insulating parts.

2. The cell piece as recited in claim 1, wherein the insulating portion extends from the surface of the cell piece to be aligned with the bottom surface of the TCO layer in the thickness direction of the cell piece.

3. The battery piece as recited in claim 1, wherein the insulation portion extends from the surface of the battery piece to be aligned with the surface of the silicon base layer in the thickness direction of the battery piece.

4. The battery piece as recited in claim 1, wherein the TCO layer has a plurality of the insulating portions distributed at each end, and the plurality of the insulating portions are distributed at intervals along an extending direction of the corresponding edge.

5. The cell piece according to claim 4, wherein the TCO layer has 2 to 30 insulating sites in each end.

6. The battery piece according to any one of claims 1-5, characterized in that, the insulation part is an insulation groove.

7. A battery piece according to any one of claims 1 to 5, characterized in that the insulating part is a layer of insulating material.

8. A solar cell string, comprising:

a plurality of battery plates according to any one of claims 1 to 7, the plurality of battery plates being arranged side by side;

and the adjacent two battery pieces are connected through the welding strips, and the welding strips correspond to the insulation parts.

9. The solar cell string according to claim 8, wherein the solder ribbon is a low temperature solder ribbon having a melting point below 150 ℃.

10. A solar cell module comprising the solar cell string according to claim 8 or 9.

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