阅读说明：本技术 双面受光的机械叠层太阳能电池用导电背板和电池组件 (Conductive backboard and battery module for double-sided light-receiving mechanical laminated solar battery ) 是由 邱开富 王永谦 杨新强 戴伟 陈刚 于 2021-10-09 设计创作，主要内容包括：本申请适用于太阳能电池技术领域,提供了一种双面受光的机械叠层太阳能电池用导电背板和电池组件。双面受光的机械叠层太阳能电池用导电背板用于连接叠层设置的第一太阳能电池与第二太阳能电池,包括基板、第一导电层和第二导电层,基板具有面向第一太阳能电池的第一侧及面向第二太阳能电池的第二侧；第一导电层至少部分地自基板的第一侧露出,第一导电层用于连接第一太阳能电池的电极；第二导电层至少部分地自基板的第二侧露出,第二导电层用于连接第二太阳能电池的电极。如此,可同时实现叠层设置的第一太阳能电池和第二太阳能电池的封装。(The application is suitable for the technical field of solar cells, and provides a conductive backboard and a battery module for a double-sided photic mechanical laminated solar cell. The conductive back plate for the double-sided light receiving mechanical laminated solar cell is used for connecting a first solar cell and a second solar cell which are arranged in a laminated mode and comprises a substrate, a first conductive layer and a second conductive layer, wherein the substrate is provided with a first side facing the first solar cell and a second side facing the second solar cell; the first conducting layer is at least partially exposed from the first side of the substrate and is used for connecting the electrode of the first solar cell; the second conductive layer is at least partially exposed from the second side of the substrate, and the second conductive layer is used for connecting the electrodes of the second solar cell. Therefore, the first solar cell and the second solar cell which are arranged in a laminated mode can be packaged at the same time.)

1. The utility model provides a two-sided photic mechanical stromatolite solar cell is with electrically conductive backplate for connect the first solar cell and the second solar cell that the stromatolite set up, its characterized in that includes:

a substrate having a first side facing the first solar cell and a second side facing the second solar cell;

a first conductive layer at least partially exposed from the first side of the substrate, the first conductive layer for connecting to an electrode of the first solar cell;

a second conductive layer at least partially exposed from the second side of the substrate, the second conductive layer for connecting to an electrode of the second solar cell.

2. The conductive backsheet for a bifacial light receiving mechanical tandem solar cell of claim 1, wherein a first groove is formed on a first side of said substrate, said first conductive layer being at least partially disposed in said first groove;

and/or a second groove is formed on the second side of the substrate, and the second conducting layer is at least partially arranged in the second groove.

3. The double-sided photic conductive backsheet for a mechanical tandem solar cell of claim 1, wherein the first conductive layer comprises first connecting portions arranged at intervals, and the first connecting portions correspond to the electrodes of the first solar cell one by one;

and/or the second conducting layer comprises second connecting parts arranged at intervals, and the second connecting parts correspond to the electrodes of the second solar cell one to one.

4. The conductive backsheet for a bifacial light receiving mechanical tandem solar cell of claim 3, wherein said first conductive layer comprises a plurality of first conductive bumps and a plurality of second conductive bumps disposed at intervals.

5. The double-sided photic conductive backsheet for a mechanical tandem solar cell of claim 4, wherein a first spacing region is disposed between the first conductive block and the second conductive block, the first conductive layer further comprises a first transmission portion and a second transmission portion, the first transmission portion connects each of the first conductive blocks, and the second transmission portion connects each of the second conductive blocks.

6. The double-sided photic conductive backsheet for a mechanical tandem solar cell of claim 3, wherein said second connecting portion comprises a plurality of third conductive bumps and a plurality of fourth conductive bumps disposed at intervals.

7. The double-sided illuminated conductive backsheet for a mechanical tandem solar cell according to claim 6, wherein a second spacer region is disposed between the third conductive block and the fourth conductive block, the second conductive layer further comprises a third transmission portion and a fourth transmission portion, the third transmission portion is connected to each of the third conductive blocks, and the fourth transmission portion is connected to each of the fourth conductive blocks.

8. The conductive backsheet for a bifacial light receiving mechanical tandem solar cell according to any one of claims 1-7, wherein the material used for the first conductive layer comprises a transparent conductive layer; and/or the material used for the second conductive layer comprises a transparent conductive layer.

9. The conductive backsheet for a bifacial light receiving mechanical tandem solar cell according to any one of claims 1-7, wherein said substrate is a transparent substrate.

10. The double-sided illuminated conductive backsheet for a mechanical tandem solar cell according to claim 9, wherein the width of the first connecting portion is less than or equal to the width of the electrode of the first cell corresponding to the first connecting portion;

and/or the width of the second connecting part is less than or equal to the width of the electrode of the second battery corresponding to the second connecting part.

11. The electrically conductive backsheet for a bifacial light receiving mechanical tandem solar cell according to any one of claims 1-7, wherein said substrate comprises at least one of glass, EPE, EVA, silicone, PET and TPT.

12. A battery module comprising the double-sided illuminated mechanical laminate solar cell conductive backsheet of any of claims 1-11, a plurality of the first solar cells being connected to the first conductive layer and a plurality of the second solar cells being connected to the second conductive layer.

13. A photovoltaic system comprising the cell assembly of claim 12.

Technical Field

The application belongs to the technical field of solar cells, and particularly relates to a double-sided photic conductive backboard and a battery module for a mechanical laminated solar cell.

Background

In the related art, the conductive back plate is generally sequentially stacked with a polymer composite insulating layer, a metal foil, a polymer back plate, and an encapsulation layer. However, the conductive backsheet is typically designed to be single-sided to receive light, and only single-sided solar cell packaging can be performed. Therefore, how to design the conductive back plate to package the double-sided photic mechanical laminated solar cell into an assembly becomes a problem to be solved urgently.

Disclosure of Invention

The application provides a two-sided photic mechanical lamination solar cell is with electrically conductive backplate and battery pack, aims at solving the problem of how to design electrically conductive backplate in order to encapsulate the two-sided photic mechanical lamination solar cell as the subassembly.

In a first aspect, the application provides a two-sided photic electrically conductive backplate for mechanical tandem solar cell for connect the first solar cell and the second solar cell that the stromatolite set up, include:

a substrate having a first side facing the first solar cell and a second side facing the second solar cell;

a first conductive layer at least partially exposed from the first side of the substrate, the first conductive layer for connecting to an electrode of the first solar cell;

a second conductive layer at least partially exposed from the second side of the substrate, the second conductive layer for connecting to an electrode of the second solar cell.

Optionally, a first groove is formed on the first side of the substrate, and the first conductive layer is at least partially disposed in the first groove;

and/or a second groove is formed on the second side of the substrate, and the second conducting layer is at least partially arranged in the second groove.

Optionally, the first conductive layer includes first connection portions arranged at intervals, and the first connection portions correspond to electrodes of the first solar cell one to one;

and/or the second conducting layer comprises second connecting parts arranged at intervals, and the second connecting parts correspond to the electrodes of the second solar cell one to one.

Optionally, the first conductive layer includes a plurality of first conductive blocks and a plurality of second conductive blocks arranged at intervals.

Optionally, a first spacer is disposed between the first conductive block and the second conductive block, the first conductive layer further includes a first transmission portion and a second transmission portion, the first transmission portion connects each of the first conductive blocks, and the second transmission portion connects each of the second conductive blocks.

Optionally, the second connection portion includes a plurality of third conductive blocks and a plurality of fourth conductive blocks arranged at intervals.

Optionally, a second spacing region is disposed between the third conductive block and the fourth conductive block, the second conductive layer further includes a third transmission portion and a fourth transmission portion, the third transmission portion is connected to each of the third conductive blocks, and the fourth transmission portion is connected to each of the fourth conductive blocks.

Optionally, the material used for the first conductive layer comprises a transparent conductive layer; and/or the material used for the second conductive layer comprises a transparent conductive layer.

Optionally, the substrate is a transparent substrate.

Optionally, the width of the first connection portion is less than or equal to the width of the electrode of the first battery corresponding to the first connection portion;

and/or the width of the second connecting part is less than or equal to the width of the electrode of the second battery corresponding to the second connecting part.

Optionally, the substrate comprises at least one of glass, EPE, EVA, silicone, PET, and TPT.

In a second aspect, the present application provides a battery module including the double-sided light receiving conductive backsheet for a mechanical tandem solar cell according to any one of the above, wherein a plurality of the first solar cells are connected to the first conductive layer, and a plurality of the second solar cells are connected to the second conductive layer.

In a third aspect, the present application provides a photovoltaic system including the above-described cell assembly.

In the double-sided photic mechanical tandem solar cell of this application embodiment is with electrically conductive backplate, battery pack and photovoltaic system, through the first conducting layer that exposes from one side of base plate connect first solar cell, through the second conducting layer that exposes from the opposite side of base plate connect second solar cell, can realize the encapsulation of the first solar cell and the second solar cell of stromatolite setting simultaneously. In one embodiment, the conductive backboard is a transparent conductive backboard, and on the basis of simultaneously packaging the first solar cell and the second solar cell which are arranged in a laminated manner, light rays penetrating through one solar cell can penetrate through the conductive backboard to enter the other solar cell, so that the absorbed light rays can be increased, and the conversion efficiency is improved. In another embodiment, the number of the first solar cells is multiple, and the first solar cells are connected in series through the transparent conductive back plate to form a first solar cell string, and the number of the second solar cells is multiple, and the second solar cells are connected in series through the transparent conductive back plate to form a second solar cell string. In another embodiment, the first solar cell and the second solar cell can be respectively engaged with the first conductive layer and the second conductive layer of the conductive back sheet, so that fast packaging can be realized, the cost is reduced, and the packaging efficiency is improved.

Drawings

Fig. 1 is a schematic plan view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell according to an embodiment of the present application;

fig. 2 is a schematic cross-sectional view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell according to an embodiment of the present disclosure;

fig. 3 is a schematic cross-sectional view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell according to an embodiment of the present disclosure;

fig. 4 is a schematic plan view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell according to an embodiment of the present application;

fig. 5 is a schematic plan view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell according to an embodiment of the present application;

fig. 6 is a schematic plan view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell according to an embodiment of the present application;

fig. 7 is a schematic cross-sectional view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell according to an embodiment of the present application;

fig. 8 is a schematic cross-sectional view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell according to an embodiment of the present application;

fig. 9 is a schematic plan view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell in accordance with an embodiment of the present application;

fig. 10 is a schematic cross-sectional view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell according to an embodiment of the present application;

fig. 11 is a schematic cross-sectional view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell according to an embodiment of the present application;

fig. 12 is a schematic plan view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell in accordance with an embodiment of the present application;

fig. 13 is a schematic plan view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell in accordance with an embodiment of the present application;

fig. 14 is a schematic plan view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell in accordance with an embodiment of the present application;

fig. 15 is a schematic cross-sectional view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell in accordance with an embodiment of the present application;

fig. 16 is a schematic cross-sectional view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell in accordance with an embodiment of the present application;

fig. 17 is a schematic cross-sectional view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell in accordance with an embodiment of the present application;

fig. 18 is a schematic plan view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell in accordance with an embodiment of the present application;

fig. 19 is a schematic cross-sectional view of a conductive backsheet for a double-sided illuminated mechanical tandem solar cell according to an embodiment of the present application.

Description of the main element symbols:

a double-sided light receiving mechanical stacked solar cell 10, a first solar cell 101, a third conductive part 1018, a fourth conductive part 1019, a second solar cell 102, a first conductive part 1028, a second conductive part 1029, a conductive back sheet 20, a substrate 201, a first side 2011, a first plane 2013, a first groove 2015, a second side 2012, a second plane 2014, and a second groove 2016;

a first conductive layer 21, a first conductive block 211, a second conductive block 212, a first spacer 213, a first buffer 214, a first transmission part 215, a second transmission part 216, a first conductive layer,

A second conductive layer 22, a third conductive block 221, a fourth conductive block 222, a second spacer 223, a third transmission part 225, a second buffer 224, a fourth transmission part 226,

Transparent conductive layer 23, transparent connection portion 231, first connection portion 41, and second connection portion 42.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Referring to fig. 1 and fig. 2, a conductive backsheet 20 for a double-sided light receiving mechanical tandem solar cell 10 according to an embodiment of the present disclosure is used for connecting a first solar cell 101 and a second solar cell 102 stacked in a stacked manner, and the conductive backsheet 20 includes a substrate 201, a first conductive layer 21, and a second conductive layer 22. The substrate 201 has a first side 2011 facing the first solar cell 101 and a second side 2012 facing the second solar cell 102. The first conductive layer 21 is at least partially exposed from the first side 2011 of the substrate 201, and the first conductive layer 21 is used for connecting electrodes of the first solar cell 101. The second conductive layer 22 is at least partially exposed from the second side 2012 of the substrate 201, and the second conductive layer 22 is used for connecting the electrodes of the second solar cell 102.

The conductive back sheet 20 for the double-sided light receiving mechanical tandem solar cell 10 according to the embodiment of the present application is connected to the first solar cell 101 through the first conductive layer 21 exposed from one side of the substrate 201, and connected to the second solar cell 102 through the second conductive layer 22 exposed from the other side of the substrate 201, so that the first solar cell 101 and the second solar cell 102 can be packaged in a tandem manner. In one embodiment, the conductive back sheet 20 is a transparent conductive back sheet, and on the basis of simultaneously encapsulating the first solar cell 101 and the second solar cell 102 arranged in a stacked manner, light passing through one solar cell can pass through the conductive back sheet 20 and then enter the other solar cell, so that the absorbed light can be increased, and the conversion efficiency can be improved. In another embodiment, the number of the first solar cells 101 is plural, and the series connection is realized through the transparent conductive back sheet 20 to form a first solar cell string, and the number of the second solar cells 102 is plural, and the series connection is realized through the transparent conductive back sheet 20 to form a second solar cell string. In yet another embodiment, the first solar cell 101 and the second solar cell 102 can be engaged with the first conductive layer 21 and the second conductive layer 22 of the conductive back sheet 20, respectively, so that fast packaging can be achieved, the cost can be reduced, and the packaging efficiency can be improved.

Note that it is possible that the first solar cell 101 is a top cell and the second solar cell 102 is a bottom cell; the first solar cell 101 may be a bottom cell and the second solar cell 102 may be a top cell. The specific stacking direction of the first solar cell 101 and the second solar cell 102 is not limited herein. For convenience of explanation, the following description will be given taking the first solar cell 101 as a top cell and the second solar cell 102 as a bottom cell as an example.

Specifically, the first conductive layer 21 is connected to the main grid of the first solar cell 101, and the second conductive layer 22 is connected to the main grid of the second solar cell 102. Therefore, the main grid is large in width and convenient to connect, the process difficulty can be reduced, and the production efficiency is improved. It is understood that in other examples, the first conductive layer 21 may connect to the fine grid of the first solar cell 101 and the second conductive layer 22 may connect to the fine grid of the second solar cell 102.

Referring to fig. 1, specifically, the double-sided light receiving mechanical tandem solar cell 10 includes a first solar cell 101 and a second solar cell 102 stacked together. The first solar cell 101 is provided with interdigitated structures 11 on the surface facing the second solar cell 102, and the second solar cell 102 is provided with interdigitated structures 11 on the surface facing the first solar cell 101. Therefore, the surface of the opposite side cell is not required to be provided with the electrode, so that the sunlight emitted to the surface deviating from the opposite side cell is prevented from being shielded by the electrode, and the photoelectric conversion efficiency is improved.

It will be appreciated that when the first solar cell 101 and the second solar cell 102 are provided with interdigitated structures 11 on the surfaces facing the opposite cell, one mechanical tandem solar cell 10 may be rotated 180 deg. and the rotated mechanical tandem solar cell 10 may be connected in series with another non-rotated mechanical tandem solar cell 10 to form a cell assembly.

Referring to fig. 2, in particular, the first conductive layer 21 includes a plurality of first conductive blocks 211 and a plurality of second conductive blocks 212 arranged at intervals. In this way, the first conductive bumps 211 and the second conductive bumps 212 may be respectively connected to two conductive portions of the interdigital structure 11 of the first solar cell 101.

Further, a first spacer 213 may be disposed between the first conductive block 211 and the second conductive block 212. In this manner, the first spacer 213 serves to space the adjacent conductive blocks to insulate the adjacent conductive blocks from each other.

Similarly, the second conductive layer 22 includes a plurality of third conductive bumps 221 and a plurality of fourth conductive bumps 222 arranged at intervals. In this way, the third conductive block 221 and the fourth conductive block 222 may respectively connect two conductive parts in the interdigital structure 11 of the second solar cell 102.

Further, a second spacer region 223 may be disposed between the third conductive block 221 and the fourth conductive block 222. As such, the second spacer regions 223 serve to space the adjacent conductive blocks to insulate the adjacent conductive blocks from each other.

Specifically, in the example of fig. 1, the first spacer 213 may be an insulating portion provided to the substrate 201. Specifically, an insulating material such as glass, EPE, EVA, silicone, PET, and TPT may be filled in the first spacer 213 to form an insulating part. It is understood that in other examples, the first spacer 213 may be a gap, i.e. an air isolation, or a protrusion protruding from the insulating base of the substrate 201 to the first side 2011. The specific form of the first spacer 213 is not limited herein.

Similarly, in the example of fig. 1, the second spacer regions 223 may be insulating portions provided on the substrate 201. Specifically, the second isolation region 223 may be filled with an insulating material such as glass, EPE, EVA, silicone, PET, and TPT to form an insulating portion. It is understood that in other examples, the second spacer region 223 may be a gap, i.e. an air isolation, or a protrusion protruding from the insulating base of the substrate 201 to the second side 2012. The specific form of the second spacer regions 223 is not limited herein.

Specifically, in the example of fig. 1, the first solar cell 101 and the second solar cell 102 are both interdigitated back contact crystalline silicon solar cells, and the interdigitated structure 11 includes two kinds of electrodes, i.e., interdigitated electrodes, alternately arranged. The first conductive piece 211 and the second conductive piece 212 are respectively used to connect two kinds of electrodes of the first solar cell 101. The third conductive piece 221 and the fourth conductive piece 222 are respectively used for connecting two electrodes of the second solar cell 102.

It is understood that in other embodiments, the first solar cell 101 and the second solar cell 102 may be both interdigital back contact thin film solar cells, and the interdigital structure 11 comprises two conductive regions alternately arranged. The first conductive block 211 and the second conductive block 212 are respectively used to connect two conductive regions of the first solar cell 101. The third conductive block 221 and the fourth conductive block 222 are respectively used to connect two conductive regions of the second solar cell 102. In other embodiments, the first solar cell 101 may be an interdigitated back contact crystalline silicon solar cell and the second solar cell 102 may be an interdigitated back contact thin film solar cell. In still other embodiments, the first solar cell 101 may be an interdigitated back contact thin film solar cell and the second solar cell 102 may be an interdigitated back contact crystalline silicon solar cell.

Note that the thin film battery may serve as a bottom battery. Therefore, the characteristic of good weak light response of the thin film battery can be fully utilized, sunlight reflected by the ground or other objects can be fully absorbed, and the photoelectric conversion efficiency can be improved. The crystalline silicon cell may serve as the top cell. Thus, the advantage of high conversion efficiency of the crystalline silicon battery is fully exerted. This is advantageous in improving the overall photoelectric conversion efficiency.

Other explanations of this part are similar to the above, and reference is made to the above for avoiding redundancy, which is not described herein again.

Referring to fig. 3, optionally, the first conductive layer 21 includes a plurality of first conductive blocks 211, a plurality of second conductive blocks 212, a first transmission portion 215 and a second transmission portion 216, the first transmission portion 215 is connected to each first conductive block 211, and the second transmission portion 216 is connected to each second conductive block 212. In this way, the currents collected by the first conductive block 211 and the second conductive block 212 can be led out of the conductive backplate 20 through the first transmission part 215 and the second transmission part 216, respectively.

Specifically, the first transmission part 215 and the second transmission part 216 may be metal lines. Compared with the prior art that the whole copper foil is adopted to transmit the current, the metal wire is adopted to transmit the current, so that the metal consumption can be reduced, and the cost is reduced.

In the present embodiment, the first transfer portion 215 and the second transfer portion 216 are provided inside the substrate 201. The third transfer portion 225 and the fourth transfer portion 226 are provided inside the substrate 201. Thus, the internal space of the substrate 201 can be fully utilized. Thus, first conductive layer 21 is partially exposed from first side 2011 of substrate 201, and second conductive layer 22 is partially exposed from second side 2012 of substrate 201.

Specifically, the first transmission part 215 and the second transmission part 216 are located at different depths in the substrate 201, so that the first transmission part 215 and the second transmission part 216 may be staggered by the thickness of the conductive back plate 20, so that the first transmission part 215 and the second transmission part 216 are insulated from each other.

Specifically, orthographic projections of the first transmission part 215 and the second transmission part 216 on the first plane 2013 are staggered. As such, the first transmission part 215 and the second transmission part 216 may be staggered by the length and width of the conductive backplane 20.

Referring to fig. 4, it is understood that in other embodiments, the first transmitting portion 215 and the second transmitting portion 216 may be disposed on the first plane 2013 of the substrate 201. Thus, a circuit does not need to be formed inside the substrate 201, which is beneficial to improving the production efficiency. In this way, the first conductive layer 21 is entirely exposed from the first side 2011 of the substrate 201.

Specifically, in fig. 4, the first conductive piece 211 and the second conductive piece 212 each have a triangular shape. Therefore, the shape is regular, the preparation is convenient, and the production efficiency is improved. It is understood that in other embodiments, the first conductive block 211 and the second conductive block 212 may have a rectangular shape, a square shape, a circular shape, an oval shape, or other shapes.

Specifically, in fig. 4, the first spacer 213 has a rectangular shape. It is understood that in other embodiments, the first spacer 213 may have a circular, square, triangular, oval, or other shape.

Specifically, in fig. 4, the first transmission portion 215 and the second transmission portion 216 are both straight. Therefore, the shape is regular, the preparation is convenient, the production efficiency is improved, and the appearance is clean and tidy. It is understood that in other embodiments, the first transmission portion 215 and the second transmission portion 216 may both be curved, both broken; the first transmission part 215 may be a straight line, and the second transmission part 216 may be a curved line or a broken line; the first transmission portion 215 may be curved or broken and the second transmission portion 216 may be straight.

Specifically, in fig. 4, the first conductive piece 211 and the second conductive piece 212 are disposed to be shifted in both the longitudinal direction and the width direction of the substrate 201. In other words, between two adjacent columns of the first conductive bumps 211, one column of the second conductive bumps 212 is disposed; between two adjacent rows of the first conductive bumps 211, a row of the second conductive bumps 212 is disposed. Thus, the degree of misalignment between the first conductive block 211 and the second conductive block 212 is relatively large, and the circuit is prevented from being easily disordered due to the relatively small degree of misalignment. Moreover, this allows the first transfer portion 215 and the second transfer portion 216 to be in a straight line, facilitating the preparation of the first transfer portion 215 and the second transfer portion 216.

It is understood that in other embodiments, the first conductive bumps 211 and the second conductive bumps 212 may be staggered only along the length of the substrate 201; the substrates 201 may be arranged so as to be shifted only in the longitudinal direction.

Referring to fig. 5, it is understood that in other embodiments, the third transmitting portion 225 and the fourth transmitting portion 226 may be disposed on the second plane 2014 of the substrate 201. Thus, a circuit does not need to be formed inside the substrate 201, which is beneficial to improving the production efficiency. Thus, second conductive layer 22 is entirely exposed from second side 2012 of substrate 201.

Specifically, the first transmission part 215 and the second transmission part 216 may each have a transparent shape. Thus, the first transmission portion 215 and the second transmission portion 216 can be prevented from blocking sunlight, which is beneficial to improving the photoelectric conversion efficiency.

Similarly, the second conductive layer 22 includes a plurality of third conductive blocks 221, a plurality of fourth conductive blocks 222, a third transmission portion 225, and a fourth transmission portion 226, the third transmission portion 225 and the fourth transmission portion 226 being insulated from each other, the third transmission portion 225 connecting each of the third conductive blocks 221, and the fourth transmission portion 226 connecting each of the fourth conductive blocks 222. In this way, the currents collected by the third conductive block 221 and the fourth conductive block 222 can be respectively conducted out of the conductive backplane 20 through the third transmission unit 225 and the fourth transmission unit 226.

For the explanation and explanation of this part, reference is made to the foregoing description, and redundant description is omitted here.

Referring to fig. 6, the double-sided light receiving mechanical tandem solar cell 10 optionally includes a first solar cell 101 and a second solar cell 102 stacked together. The first solar cell 101 is provided with the interdigitated structures 11 on the surface facing the second solar cell 102, and the second solar cell 102 is not provided with the interdigitated structures 11 on the surface facing the first solar cell 101. Specifically, the second solar cell 102 is provided with a first conductive portion 1028 on a side facing the first solar cell 101 and a second conductive portion 1029 on a side facing away from the first solar cell 101.

Referring to fig. 7, the first conductive layer 21 includes a first conductive block 211, a second conductive block 212, and a first spacer 213. The first conductive bumps 211 and the second conductive bumps 212 are respectively used for connecting two conductive parts of the interdigital structure 11 of the first solar cell 101. The first spacer 213 serves to space adjacent conductive blocks such that the conductive blocks are insulated from each other.

Note that the second conductive layer 22 includes the third conductive bump 221 and the second spacer region 223. The third conductive block 221 is used to connect the first conductive part 1028 on the side of the second solar cell 102 facing the first solar cell 101. The second spacer regions 223 serve to space adjacent conductive blocks such that the conductive blocks are insulated from each other.

In the example of fig. 6, the first solar cell 101 is an interdigitated back contact crystalline silicon solar cell, and the interdigitated structure 11 comprises two types of electrodes, i.e. interdigitated electrodes, arranged alternately. The first conductive piece 211 and the second conductive piece 212 are respectively used to connect two kinds of electrodes of the first solar cell 101. The second solar cell 102 is a double-sided contact crystalline silicon solar cell, and the third conductive block 221 is used for connecting electrodes on one side of the second solar cell 102.

It is understood that in other embodiments, the first solar cell 101 may be an interdigitated back contact thin film solar cell and the second solar cell 102 may be a double-sided contact thin film solar cell. In other embodiments, the first solar cell 101 may be an interdigitated back contact crystalline silicon solar cell and the second solar cell 102 may be a double-sided contact thin film solar cell. In still other embodiments, the first solar cell 101 may be an interdigitated back contact thin film solar cell and the second solar cell 102 may be a double-sided contact crystalline silicon solar cell. The explanation of this part is similar to the above, and reference is made to the above for avoiding redundancy, which is not described herein again.

Referring to fig. 8, optionally, the first conductive layer 21 includes a plurality of first conductive blocks 211, a plurality of second conductive blocks 212, a first transmission portion 215 and a second transmission portion 216, the first transmission portion 215 and the second transmission portion 216 are insulated from each other, the first transmission portion 215 connects each of the first conductive blocks 211, and the second transmission portion 216 connects each of the second conductive blocks 212. In this way, the currents collected by the first conductive block 211 and the second conductive block 212 can be led out of the conductive backplate 20 through the first transmission part 215 and the second transmission part 216, respectively. The second conductive layer 22 includes a plurality of third conductive blocks 221 and a third transmission part 225, and the third transmission part 225 connects each of the third conductive blocks 221. In this way, the current collected by the third conductive block 221 can be conducted out of the conductive backplate 20 through the third transmission unit 225. For the explanation and explanation of this part, reference is made to the foregoing description, and redundant description is omitted here.

Referring to fig. 9, the double-sided light receiving mechanical tandem solar cell 10 optionally includes a first solar cell 101 and a second solar cell 102 stacked together. The first solar cell 101 is not provided with the interdigitated structures 11 on the surface facing the second solar cell 102, and the second solar cell 102 is not provided with the interdigitated structures 11 on the surface facing the first solar cell 101. Specifically, the second solar cell 102 is provided with a first conductive portion 1028 on a side facing the first solar cell 101 and a second conductive portion 1029 on a side facing away from the first solar cell 101. The first solar cell 101 is provided with a third conductive portion 1018 on a side facing the second solar cell 102, and a fourth conductive portion 1019 on a side facing away from the second solar cell 102.

Referring to fig. 10, note that the first conductive layer 21 includes a first conductive block 211 and a first spacer 213. The first conductive block 211 is used to connect a third conductive portion 1018 on the side of the first solar cell 101 facing the second solar cell 102. The first spacer 213 serves to space adjacent conductive blocks such that the conductive blocks are insulated from each other. The second conductive layer 22 includes a third conductive bump 221 and a second spacer region 223. The third conductive block 221 is used to connect the first conductive part 1028 on the side of the second solar cell 102 facing the first solar cell 101. The second spacer regions 223 serve to space adjacent conductive blocks such that the conductive blocks are insulated from each other.

In the example of fig. 9, the first solar cell 101 is a double-sided contact crystalline silicon solar cell, and the first conductive bumps 211 are used to connect electrodes on a side of the first solar cell 101 facing the second solar cell 102. The second solar cell 102 is a double-sided contact crystalline silicon solar cell, and the third conductive block 221 is used to connect electrodes on a side of the second solar cell 102 facing the first solar cell 101.

It is understood that in other embodiments, the first solar cell 101 may be a double-sided contact thin film solar cell and the second solar cell 102 may be a double-sided contact thin film solar cell. In other embodiments, the first solar cell 101 may be a double-side contact crystalline silicon solar cell and the second solar cell 102 may be a double-side contact thin film solar cell. In still other embodiments, the first solar cell 101 may be a double-side contact thin film solar cell and the second solar cell 102 may be a double-side contact crystalline silicon solar cell. The explanation of this part is similar to the above, and reference is made to the above for avoiding redundancy, which is not described herein again.

Referring to fig. 11, optionally, the first conductive layer 21 includes a plurality of first conductive blocks 211 and a first transmission portion 215, and the first transmission portion 215 is connected to each of the first conductive blocks 211. In this way, the current collected by the first conductive block 211 can be conducted out of the conductive backplate 20 through the first transmission part 215. The second conductive layer 22 includes a plurality of third conductive blocks 221 and a third transmission part 225, and the third transmission part 225 connects each of the third conductive blocks 221. In this way, the current collected by the third conductive block 221 can be conducted out of the conductive backplate 20 through the third transmission unit 225.

Specifically, the first transmitting portion 215 may be disposed inside the substrate 201, as shown in fig. 11, or disposed on the first plane 2013 of the first side 2011 of the substrate 201, as shown in fig. 12. The third transmitting portion 225 may be disposed inside the substrate 201, as shown in fig. 11, or disposed on the second plane 2014 of the second side 2012 of the substrate 201, as shown in fig. 13.

For further explanation and explanation of this section, reference is made to the foregoing description, and further explanation is omitted here to avoid redundancy.

Note that the above is merely an example, and does not represent a limitation on the specific structure of the first solar cell 101 and the second solar cell 102. It is understood that the specific structure of the conductive backsheet 20 may be adapted according to the specific structure of the first and second solar cells 101 and 102.

Optionally, the substrate 201 is a transparent substrate. Therefore, the substrate 201 can transmit sunlight, the sunlight is prevented from being shielded by the substrate 201, and the photoelectric conversion efficiency of the double-sided photic mechanical tandem solar cell 10 is improved. It will be appreciated that sunlight incident from the side of one cell facing away from the opposite cell, after passing through the cell and being transmitted by the substrate 201, may be incident on the opposite cell for use by the opposite cell.

Specifically, the range of the light transmittance of the substrate 201 is greater than 80%. For example, 80%, 82%, 85%, 87%, 89%, 90%, 92%, 95%, 97%, 99%, 100%. Thus, the light transmittance of the substrate 201 is in a proper range, and the phenomenon that sunlight is difficult to transmit due to the fact that the light transmittance is small is avoided, so that the photoelectric conversion efficiency caused by shielding of the substrate 201 is avoided being low.

Alternatively, the substrate 201 includes at least one of glass, EPE (pearl wool), EVA (ethylene-vinyl acetate copolymer), silicone, PET (polyethylene glycol terephthalate), and TPT (polyvinyl fluoride composite film).

It can be understood that the glass has high transmittance to sunlight, wide application, easy acquisition and contribution to improving the photoelectric conversion efficiency and the production efficiency.

It can be understood that the EPE can be waterproof, moistureproof, shockproof and anti-collision, and is beneficial to ensuring the reliability of the battery assembly.

It can be understood that EVA is water-resistant, corrosion-resistant, elastic and soft, can play a role in buffering, and is favorable for ensuring the reliability of the battery pack. Moreover, the EVA can transmit light, and the transmitted light can be utilized by the battery, which is beneficial to improving the photoelectric conversion efficiency.

It can be appreciated that silicone is resistant to high temperatures and has strong water repellency, which is beneficial to improving the reliability of the conductive backsheet 20. Moreover, the organic silicon has good electrical insulation performance, can realize electrical isolation of the first solar cell 101 and the second solar cell 102, and avoids current matching between the first solar cell 101 and the second solar cell 102, thereby avoiding efficiency limitation caused by current matching.

As can be understood, the PET is impact-resistant and corrosion-resistant, and is beneficial to ensuring the reliability of the battery assembly. And moreover, the PET has high transparency, so that light rays are shielded by the PET as little as possible, and the photoelectric conversion efficiency is improved.

As can be understood, TPT has strong anti-corrosion capability and good insulating property, and is beneficial to ensuring the reliability of the battery pack.

In the present embodiment, the substrate 201 is a glass substrate. Thus, the photoelectric conversion efficiency and the production efficiency are improved. Further, the first conductive layer 21 and the second conductive layer 22 may be disposed on the glass substrate, a conductive adhesive or solder paste may be disposed between the first conductive layer 21 and the electrode, and a conductive adhesive or solder paste may be disposed between the second conductive layer 22 and the electrode. Therefore, the electrical connection between the electrode and the conductive layer is more stable.

In other embodiments, the substrate 201 may include 1, 2, 3,4, 5, or all of glass, EPE, EVA, silicone, PET, and TPT. For example, the substrate 201 may include glass, EPE, EVA, silicone, PET, and TPT; as another example, the substrate 201 may include glass, EPE, EVA, silicone, and PET; as another example, the substrate 201 may include glass, EPE, EVA, and silicone; for example, the substrate 201 may include glass, EPE, and EVA; as another example, the substrate 201 may include glass and EPE; as another example, the substrate 201 may include glass. The specific form of the substrate 201 is not limited herein.

Optionally, the material used for the first conductive layer 21 includes a transparent conductive layer or a metal; and/or, the material used for the second conductive layer 22 comprises a transparent conductive layer or a metal. In this way, various forms of the first conductive layer 21 and the second conductive layer 22 are provided, which can be selected according to actual conditions during the production process.

Specifically, in the present embodiment, the Transparent Conductive layer is Transparent Conductive Oxide (TCO). Thus, the TCO has high permeability and can reflect light, and the loss of sunlight can be reduced. Thus, the photoelectric conversion efficiency is advantageously improved.

It is understood that in other embodiments, the transparent conductive layer may be a metal film system, a compound film system, a polymer film system, a composite film system, or the like, other than the oxide film system. Such as PEDOT (a polymer of EDOT (3, 4-ethylenedioxythiophene monomer), a metal mesh, a carbon nanorod conductive film (CNBFilms), a Silver Nanowire (SNW), Graphene (Graphene), and the like. The specific form of the transparent conductive layer is not limited herein.

Further, TCOs include, but are not limited to, Indium Tin Oxide (ITO), Fluorine-doped Tin Oxide (FTO), Aluminum-doped Zinc Oxide (AZO). The specific type of TCO is not limited herein.

In the present embodiment, the TCO is Indium Tin Oxide (ITO). The ITO has high light transmittance, strong conductivity, low resistivity, and good stability and alkali resistance. And the transparent conducting layer is made of ITO, so that the photoelectric conversion efficiency and reliability of the component are improved.

Specifically, in the present embodiment, the metal is aluminum. It is understood that in other embodiments, the metal may be one or more of copper, silver, aluminum, nickel, magnesium, iron, titanium, molybdenum, tungsten, and the like.

It is understood that the first conductive layer 21 and the second conductive layer 22 may be the same or different. In one example, the first conductive layer 21 and the second conductive layer 22 each include a transparent conductive layer; in another example, the first conductive layer 21 includes a transparent conductive layer, and the second conductive layer 22 includes a metal; in yet another example, the first conductive layer 21 includes a metal, and the second conductive layer 22 includes a transparent conductive layer; in yet another example, the first conductive layer 21 and the second conductive layer 22 each include a metal. The specific form of the first conductive layer 21 and the second conductive layer 22 is not limited herein.

Referring to fig. 14, optionally, at least one of the first conductive layer 21 and the second conductive layer 22 includes a transparent conductive layer 23, the transparent conductive layer 23 includes transparent connection portions 231 arranged at intervals, the transparent connection portions 231 correspond to the electrodes 1101 of the battery one by one, and the width x of the transparent connection portions 231 is greater than the width y of the electrodes 1101 corresponding to the transparent connection portions 231.

Thus, even if the width of the transparent connection portion 231 is larger than that of the corresponding electrode, sunlight is not blocked, and the sunlight which passes through one cell and is blocked by the transparent connection portion 231 can be prevented from being not used by another cell, which is beneficial to improving the photoelectric conversion efficiency. Meanwhile, the width of the transparent connection part 231 is large, so that the conductivity is better.

In the example of fig. 14, the first conductive layer 21 and the second conductive layer 22 are transparent, in other words, both transparent conductive layers 23. It is understood that in other embodiments, the first conductive layer 21 may be transparent and the second conductive layer 22 may not be transparent; the first conductive layer 21 may not be transparent, and the second conductive layer 22 may be transparent.

Referring to fig. 2, in a case where the first conductive block 211 and the second conductive block 212 are transparent, the transparent connection portion 231 may include the first conductive block 211 and the second conductive block 212. In the case where both the third conductive piece 221 and the fourth conductive piece 222 are transparent, the transparent connection part 231 may include the third conductive piece 221 and the fourth conductive piece 222.

Referring to fig. 2, optionally, the first conductive layer 21 is disposed on the first plane 2013 of the first side 2011 of the substrate 201; the second conductive layer 22 is disposed on the second plane 2014 of the second side 2012 of the substrate 201. Thus, the first conductive layer 21 and the second conductive layer 22 are both disposed on two planes of the substrate 201, and excessive processing of the substrate 201 is not required, which is beneficial to improving production efficiency.

It is understood that in other examples, only the first conductive layer 21 may be disposed on the first plane 2013 on the first side 2011 of the substrate 201; only the second conductive layer 22 may be disposed on the second plane 2014 of the second side 2012 of the substrate 201.

Referring to fig. 15, optionally, a first groove 2015 is formed on a first side 2011 of the substrate 201, and the first conductive layer 21 is at least partially disposed in the first groove 2015; a second recess 2016 is formed in the second side 2012 of the substrate 201, and a second conductive layer 22 is at least partially disposed in the second recess 2016.

So, first recess 2015 and second recess 2016 can play the effect of location, and when making first conducting layer 21 and second conducting layer 22, the counterpoint of being convenient for avoids the skew, is favorable to improving production efficiency.

Specifically, in the example of fig. 15, the first conductive layer 21 is entirely provided in the first groove 2015, and the thickness of the first conductive layer 21 is the same as the depth of the first groove 2015; in the example of fig. 16, the first conductive layer 21 is entirely provided in the first groove 2015, and the thickness of the first conductive layer 21 is smaller than the depth of the first groove 2015; in the example of fig. 17, the first conductive layer 21 is partially provided in the first groove 2015, and the thickness of the first conductive layer 21 is larger than the depth of the first groove 2015. The specific relationship of the first conductive layer 21 to the first groove 2015 is not limited herein.

Similarly, in the example of fig. 15, the second conductive layer 22 is entirely provided in the second groove 2016, and the thickness of the second conductive layer 22 is the same as the depth of the second groove 2016; in the example of fig. 16, the second conductive layer 22 is entirely provided in the second groove 2016, and the thickness of the second conductive layer 22 is smaller than the depth of the second groove 2016; in the example of fig. 17, the second conductive layer 22 is partially provided in the second groove 2016, and the thickness of the second conductive layer 22 is larger than the depth of the second groove 2016. The specific relationship between the second conductive layer 22 and the second recess 2016 is not limited herein.

It is understood that in other embodiments, a first groove 2015 may be formed on the first side 2011 of the substrate 201, the first conductive layer 21 is at least partially disposed in the first groove 2015, and a second groove 2016 is not formed on the second side 2012 of the substrate 201; there may be no first recess 2015 formed on the first side 2011 of the substrate 201, a second recess 2016 formed on the second side 2012 of the substrate 201, and the second conductive layer 22 at least partially disposed in the second recess 2016.

Referring to fig. 18, optionally, the first conductive layer 21 includes first connection portions 41 disposed at intervals, and the first connection portions 41 correspond to the electrodes 1101 of the first solar cell 101 one to one; the second conductive layer 22 includes second connection portions 42 arranged at intervals, and the second connection portions 42 correspond to the electrodes 1101 of the second solar cell 102 one by one.

In this manner, the first conductive layer 21 is connected to the electrode 1101 of the first solar cell 101 via the first connection portion 41.

Specifically, the substrate 201 is a transparent substrate, the width a of the first connection portion 41 is less than or equal to the width b of the electrode 1101 of the first cell 101 corresponding to the first connection portion 41, and the width c of the second connection portion 42 is less than or equal to the width d of the electrode 1101 of the second cell 102 corresponding to the second connection portion 42.

Thus, under the condition that the first connection portion 41 is electrically connected to the electrode 1101 of the first solar cell 101, the first connection portion 41 can be relatively small, so that the situation that the sunlight transmitted from the first solar cell 101 is blocked due to the overlarge first connection portion 41 is avoided, and the photoelectric conversion efficiency is favorably improved. In addition, since the first connection portion 41 is small, the number of raw materials of the first conductive layer 21 can be reduced, which is advantageous for cost reduction. Similarly, the second connection portion 42 is small, which is advantageous in improving photoelectric conversion efficiency and reducing cost.

It is understood that in other embodiments, the width a of the first connection portion 41 may be smaller than or equal to the width b of the electrode 1101 corresponding to the first connection portion 41, and the width c of the second connection portion 42 may be greater than the width d of the electrode 1101 corresponding to the second connection portion 42; the width a of the first connection portion 41 may be greater than the width b of the electrode 1101 corresponding to the first connection portion 41, and the width c of the second connection portion 42 may be less than or equal to the width d of the electrode 1101 corresponding to the second connection portion 42.

Alternatively, when the first solar cell 101 and the conductive back sheet 20 are assembled, a part of the connection points may be selected from the electrodes 1101 of the first solar cell 101, and the selected part of the connection points may be correspondingly connected to the first connection portions 41. When the second solar cell 102 and the conductive back sheet 20 are assembled, a part of the connection points may be selected from the electrodes 1101 of the second solar cell 102, and the selected part of the connection points may be correspondingly connected to the second connection portions 42. Therefore, the alignment process difficulty can be reduced, and the production efficiency can be improved.

Note that, in the case where the first solar cell 101 is provided with the interdigital structure 11 on the surface facing the second solar cell 102, the first connection portion 41 may include a plurality of first conductive bumps 211 and a plurality of second conductive bumps 212, and the first conductive bumps 211 and the second conductive bumps 212 are respectively used to connect two conductive portions of the interdigital structure 11 of the first solar cell 101. In the case where the first solar cell 101 is not provided with the interdigitated structure 11 on the surface facing the second solar cell 102, the first connection portion 41 may include a plurality of first conductive bumps 211.

Similarly, in the case where the second solar cell 102 is provided with the interdigital structure 11 on the surface facing the first solar cell 101, the second connection portion 42 includes a plurality of third conductive bumps 221 and a plurality of fourth conductive bumps 222, and the third conductive bumps 221 and the fourth conductive bumps 222 are respectively used to connect two conductive portions in the interdigital structure 11 of the second solar cell 102. In the case where the second solar cell 102 is not provided with the interdigital structure 11 on the surface facing the first solar cell 101, the second connection part 42 includes a plurality of third conductive bumps 221.

Referring to fig. 19, the conductive backplate 20 may include a first buffer 214 disposed in the first spacing region 213; the conductive backplate 20 may include a second buffer 224 disposed in the second spaced region 223. Thus, the first solar cell 101 can be protected by the first buffer member 214, and the second solar cell 102 can be protected by the second buffer member 224, which is beneficial to improving the reliability of the battery assembly.

Specifically, the first buffer 214 includes at least one of EPE, EVA, PET. For the explanation and explanation of EPE, EVA and PET, reference is made to the foregoing description, and no further description is made here to avoid redundancy.

Specifically, the distance h between the top surface of the first cushion 214 and the top surface of the first connection portion 41 is greater than the thickness of the electrode 1101 of the first solar cell 101. Similarly, the distance H between the top surface of the second buffer 224 and the top surface of the second connection portion 42 is greater than the thickness of the electrode 1101 of the second solar cell 102.

In this way, after the first solar cell 101 is assembled to the conductive backsheet 20, the first buffer member 214 is compressed, so as to better support and protect the first solar cell 101. After the second solar cell 102 is assembled to the conductive backsheet 20, the second buffer member 224 is compressed, which can better support and protect the second solar cell 102.

It is understood that in other embodiments, the conductive backplate 20 includes only the first buffer 214 disposed in the first spacing region 213, and does not include the second buffer 224 disposed in the second spacing region 223; the conductive backplate 20 may not include the first buffer 214 disposed in the first spacer 213, but only include the second buffer 224 disposed in the second spacer 223.

The battery module of the embodiment of the present application includes the conductive back sheet 20 for the double-sided light receiving mechanical tandem solar cell 10, wherein the plurality of first solar cells 101 are connected to the first conductive layer 21, and the plurality of second solar cells 102 are connected to the second conductive layer 22.

In the battery module according to the embodiment of the present application, the first solar cell 101 is connected to the first conductive layer 21 exposed from one side of the substrate 201, and the second solar cell 102 is connected to the second conductive layer 22 exposed from the other side of the substrate 201, so that the double-sided light receiving mechanical tandem solar cell 10 can be packaged as a module.

Specifically, the battery module may further include a first transparent back sheet, where the first transparent back sheet is disposed on a side of the first solar cell 101 away from the conductive back sheet 20; and/or, the battery module may further include a second transparent back sheet disposed on a side of the second solar cell 102 facing away from the conductive back sheet 20. As such, the first and second solar cells 101 and 101 can be further protected by the dual glass design.

It is to be understood that in case the side of the first solar cell 101 facing away from the conductive backsheet 20 is provided with a glass substrate, the first transparent backsheet may be omitted; in case the second solar cell 102 is provided with a glass substrate on the side facing away from the conductive backsheet 20, the second transparent backsheet may be omitted.

In addition, the battery module may further include a transparent organic adhesive film, and the double-sided light-receiving mechanical tandem solar battery 10, the conductive backplane 20, the transparent organic adhesive film, the first transparent backplane and the second transparent backplane may be subjected to lamination packaging.

The photovoltaic system of the embodiment of the application comprises the battery assembly.

In the photovoltaic system of the embodiment of the application, the first conductive layer 21 exposed from one side of the substrate 201 is connected to the first solar cell 101, and the second conductive layer 22 exposed from the other side of the substrate 201 is connected to the second solar cell 102, so that the double-sided light receiving mechanical tandem solar cell 10 can be packaged as an assembly.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.