CN216719962U - Back contact battery string, back contact battery assembly and back contact battery system - Google Patents
Back contact battery string, back contact battery assembly and back contact battery system Download PDFInfo
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- CN216719962U CN216719962U CN202220295788.3U CN202220295788U CN216719962U CN 216719962 U CN216719962 U CN 216719962U CN 202220295788 U CN202220295788 U CN 202220295788U CN 216719962 U CN216719962 U CN 216719962U
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Abstract
The utility model belongs to the technical field of solar cells, and particularly relates to a back contact cell string, a back contact cell assembly and a back contact cell system. The back contact battery string includes: the battery piece comprises a P-type doped region with positive fine grid lines and an N-type doped region with negative fine grid lines, a first positive insulating block array and a second positive insulating block array are arranged on the positive fine grid lines, first conductive sections for connecting two adjacent negative fine grid lines are arranged on the first parallel positive insulating blocks and the second parallel positive insulating blocks, a first negative insulating block array and a second negative insulating block array are arranged on the negative fine grid lines, and second conductive sections for connecting two adjacent positive fine grid lines are arranged on the first parallel negative insulating blocks and the second parallel negative insulating blocks. The utility model can improve the photoelectric conversion efficiency of the cell and reduce the metal consumption; in addition, the damage to the battery piece can be avoided, the stress of the battery assembly is reduced, and the reliability of the battery assembly is improved.
Description
Technical Field
The utility model belongs to the technical field of solar cells, and particularly relates to a back contact cell string, a back contact cell assembly and a back contact cell system.
Background
Solar cells are semiconductor devices that convert light energy into electrical energy, and lower production costs and higher energy conversion efficiencies have been the goals pursued by the solar cell industry. For the conventional solar cell at present, an emitter contact electrode and a base contact electrode are respectively positioned on the front surface and the back surface of a cell piece. The front surface of the battery is a light receiving surface, and the coverage of the front metal emitter contact electrode can lead to that a part of incident sunlight is reflected and shielded by the metal electrode to cause a part of optical loss. The coverage area of the front metal electrode of the common crystalline silicon solar cell is about 7%, and the energy conversion efficiency of the cell can be directly improved by reducing the front coverage of the metal electrode.
In view of the above, the industry has introduced a back contact solar cell. The back contact solar cell is a cell with an emitter and a base contact electrode both arranged on the back (non-light-receiving surface) of the cell, the light-receiving surface of the cell is not shielded by any metal electrode, so that the short-circuit current of a cell slice is effectively increased, and meanwhile, the back can allow wider metal grid lines to reduce series resistance so as to improve the filling factor; and the battery with the front side without shielding has high conversion efficiency, looks more beautiful, and is easier to assemble the components of the full back electrode.
The positive and negative fine grid lines of the existing back contact solar cell separate hole electrons, and then collect current through the main grid, and the existence of the main grid can cause poor hole electron separation at the corresponding position, which causes efficiency loss, but if the main grid is lacked, the series resistance can be increased, which causes difficulty in collecting current, and the metal consumption of the main grid is higher, thereby greatly increasing the production cost of the cell. In addition, the back contact solar cell is usually welded through a welding strip to form a cell module, a high-temperature environment is needed in the welding process, the cell can be damaged to a certain extent, the welding strip can cause stress to the cell, the cell has the problem of hidden cracking, and the reliability of the cell is greatly reduced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a back contact battery string, aiming at solving the technical problems that the existing back contact battery has low efficiency and high cost, and easily causes damage and stress to the battery when the assembly is formed.
The present invention is achieved by providing a back contact battery string including:
each cell comprises a P-type doping region and an N-type doping region which are alternately arranged, the P-type doping region is provided with a positive thin grid line, and the N-type doping region is provided with a negative thin grid line;
a first positive electrode insulation block array and a second positive electrode insulation block array are arranged on the positive electrode fine grid line in the vertical direction, and the second positive electrode insulation block array is positioned between two adjacent first positive electrode insulation block arrays;
the first positive electrode insulating block array comprises first parallel positive electrode insulating blocks arranged on the positive electrode fine grid lines at intervals, the second positive electrode insulating block array comprises second parallel positive electrode insulating blocks arranged at intervals, and the second parallel positive electrode insulating blocks are arranged on the positive electrode fine grid lines without the first parallel positive electrode insulating blocks;
the first parallel positive electrode insulating block and the second parallel positive electrode insulating block are respectively provided with a first conductive section for connecting two adjacent negative electrode fine grid lines;
the negative electrode fine grid line is provided with a first negative electrode insulating block array and a second negative electrode insulating block array in the vertical direction, and the second negative electrode insulating block array is positioned between two adjacent first negative electrode insulating block arrays;
the first negative electrode insulation block array comprises first parallel negative electrode insulation blocks arranged on the negative electrode fine grid lines at intervals, the second negative electrode insulation block array comprises second parallel negative electrode insulation blocks arranged at intervals, and the second parallel negative electrode insulation blocks are arranged on the negative fine grid lines without the first parallel negative electrode insulation blocks;
the first parallel negative electrode insulating block and the second parallel negative electrode insulating block are respectively provided with a second conducting section for connecting two adjacent positive electrode thin grid lines;
the first conductive segment at the first edge of the first battery piece is connected with the second conductive segment at the edge of the second battery piece adjacent to the first battery piece;
the second conductive segment at a second edge opposite the first edge connects the first conductive segment at an edge of a third cell piece adjacent the first cell piece.
Still further, the back contact cell string further includes a first conductive bus bar at an end thereof and a second conductive bus bar at the other end thereof, the first conductive segment being bussed to the first conductive bus bar, the second conductive segment being bussed to the second conductive bus bar.
Furthermore, the battery pieces are connected through the interconnection bars.
Furthermore, the first conductive segment and/or the second conductive segment comprise a metal film and a composite film partially wrapping the metal film.
Furthermore, the composite film is a POE film, an EVA film, a PVB film or a co-extrusion film consisting of POE and EVA.
Still further, the first conductive segment and/or the second conductive segment is a metal film.
Furthermore, the positive fine grid line is an aluminum grid line, a silver-aluminum grid line, a copper grid line or a silver-clad copper grid line.
Furthermore, the negative electrode fine grid line is an aluminum grid line, a silver aluminum grid line, a copper grid line or a silver-coated copper grid line.
The utility model also provides a back contact battery assembly comprising the back contact battery string.
The utility model also provides a back contact battery system which comprises the back contact battery assembly.
The back contact type solar cell has the advantages that the cell sheet of the back contact type cell string does not need to be provided with the main grid, and the photoelectric conversion efficiency of the cell sheet is high; the positive electrode fine grid lines are in conductive connection through the second conductive segments, the second conductive segments are arranged at intervals, the negative electrode fine grid lines are in conductive connection through the first conductive segments, and the first conductive segments are also arranged at intervals, so that the metal consumption can be reduced, and the cost of the battery piece is greatly reduced; in addition, the back contact battery string can be made into a film pasting structure and directly pasted to form a battery assembly, and a high-temperature welding process is not needed, so that the battery piece is prevented from being damaged; the back contact battery string is not required to be connected through a welding strip, so that the problem of stress of the battery piece is avoided, and the reliability of the battery piece is greatly improved.
Drawings
Fig. 1 is a schematic view of a battery cell provided by an embodiment of the utility model;
fig. 2 is a schematic diagram of a back contact battery string provided by an embodiment of the present invention;
FIG. 3 is an enlarged view based on portion A in FIG. 2;
fig. 4 is a schematic view of a back contact cell string provided with a first bus bar and a second bus bar according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention 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 utility model and are not intended to limit the utility model.
The back contact battery string comprises at least one battery piece, wherein each battery piece comprises a P-type doped region provided with an anode thin grid line and an N-type doped region provided with a cathode thin grid line, the anode thin grid line is in conductive connection through a second conductive section and is insulated through a first anode insulating block array and a second anode insulating block array, the cathode thin grid line is in conductive connection through a first conductive section and is insulated through a first cathode insulating block array and a second cathode insulating block array, and adjacent battery pieces are also in conductive connection through the first conductive section and the second conductive section. The cell of the back contact cell string does not need to be provided with a main grid, and the photoelectric conversion efficiency of the cell is high; the positive electrode fine grid lines are in conductive connection through the second conductive segments, the second conductive segments are arranged at intervals, the negative electrode fine grid lines are in conductive connection through the first conductive segments, and the first conductive segments are also arranged at intervals, so that the metal consumption can be reduced, and the cost of the battery piece is greatly reduced; in addition, the back contact battery string can be made into a film pasting structure and directly pasted to form a battery assembly, and a high-temperature welding process is not needed, so that the battery piece is prevented from being damaged; the back contact battery string is not required to be connected through a welding strip, so that the problem of stress of the battery piece is avoided, and the reliability of the battery piece is greatly improved.
Example one
Referring to fig. 1 to 3, the first embodiment provides a back contact battery string, including:
each cell 100 comprises a P-type doped region and an N-type doped region which are alternately arranged, the P-type doped region is provided with a positive thin grid line 11, and the N-type doped region is provided with a negative thin grid line 12;
a first positive insulation block array 21 and a second positive insulation block array 22 are arranged on the positive fine grid line 11 in the vertical direction, and the second positive insulation block array 22 is positioned between two adjacent first positive insulation block arrays 21;
the first positive electrode insulating block array 21 comprises first parallel positive electrode insulating blocks 211 arranged on the positive electrode fine grid lines 11 at intervals, the second positive electrode insulating block array 22 comprises second parallel positive electrode insulating blocks 221 arranged at intervals, and the second parallel positive electrode insulating blocks 221 are arranged on the positive electrode fine grid lines 11 without the first parallel positive electrode insulating blocks 211;
the first parallel positive electrode insulating block 211 and the second parallel positive electrode insulating block 221 are respectively provided with a first conductive section 31 for connecting two adjacent negative electrode fine grid lines 12;
the negative electrode fine grid line 12 is provided with a first negative electrode insulation block array 23 and a second negative electrode insulation block array 24 in the vertical direction, and the second negative electrode insulation block array 24 is positioned between two adjacent first negative electrode insulation block arrays 23;
the first negative electrode insulation block array 23 comprises first parallel negative electrode insulation blocks 231 arranged on the negative electrode fine grid line 12 at intervals, the second negative electrode insulation block array 24 comprises second parallel negative electrode insulation blocks 241 arranged at intervals, and the second parallel negative electrode insulation blocks 241 are arranged on the negative electrode fine grid line 12 without the first parallel negative electrode insulation blocks 231;
the first parallel negative electrode insulating block 231 and the second parallel negative electrode insulating block 241 are both provided with a second conductive segment 32 for connecting two adjacent positive electrode fine grid lines 11;
the first conductive segment 31 at the first edge of a first cell slice is connected with the second conductive segment 32 at the edge of a second cell slice adjacent to the first cell slice;
the second conductive segment 32 at a second edge opposite the first edge connects the first conductive segment 31 at an edge of a third cell piece adjacent the first cell piece.
In this embodiment, the back contact battery string is a battery string formed by connecting at least one battery piece 100 in series, the back contact battery string may include two battery pieces 100, three battery pieces 100 or other more battery pieces 100 connected in series, and the number of battery pieces 100 to be connected in series may be determined according to an actual use situation. The cell piece 100 positioned at both ends of the back contact cell string is defined as an end cell piece 100, and when the back contact cell string is a plurality of cell pieces 100 connected in series, the cell piece 100 connected in series between the two end cell pieces 100 is defined as an inner cell piece 100.
As one example of the present invention, the battery sheet 100 includes, in order from top to bottom: the solar cell comprises a front passivation and antireflection layer, a silicon substrate, a back tunneling layer, P-type doped regions and N-type doped regions which are alternately arranged, a back passivation layer and a cell electrode. The P-type doped region and the N-type doped region are arranged on the lower surface of the back tunneling layer, and the battery electrode comprises an anode fine grid line 11 and a cathode fine grid line 12, wherein the anode fine grid line is in contact with the P-type doped region, and the cathode fine grid line is in contact with the N-type doped region.
Wherein an insulating region is arranged between the P-type doped region and the N-type doped region. The insulating region may be a non-conductive tape or film, or may be other suitable non-conductive shield or cover; the insulating region may comprise polypropylene or polyethylene, and may further comprise an acrylic adhesive layer. The insulating region is clamped between each P-type doped region and each N-type doped region, and the short circuit caused by the contact of the anode thin grid line 11 of the P-type doped region and the cathode thin grid line 12 of the N-type doped region is avoided through the insulating effect of the insulating region.
The positive fine grid line 11 is provided with a first positive insulation block array 21 and a second positive insulation block array 22 in the vertical direction, the first positive insulation block array 21 and the second positive insulation block array 22 are provided with a plurality of positive insulation block arrays, the first positive insulation block array 21 and the second positive insulation block array 22 are alternately arranged, the second positive insulation block array 22 is located between adjacent first positive insulation block arrays 21, the first positive insulation block array 21 is also located between adjacent second positive insulation block arrays 22, and the end portion of the positive fine grid line 11 can be the first positive insulation block array 21 or the second positive insulation block array 22.
The first positive electrode insulating block array 21 includes a plurality of first parallel positive electrode insulating blocks 211 arranged at intervals on the positive electrode fine gate line 11, as shown in fig. 1, in the same first positive electrode insulating block array 21, the first parallel positive electrode insulating blocks 211 are provided, and each first parallel positive electrode insulating block 211 is arranged at intervals on the positive electrode fine gate line 11 in the horizontal direction. The second positive electrode insulating block array 22 includes a plurality of second parallel positive electrode insulating blocks 221 arranged at intervals on the positive electrode fine gate line 11, as shown in fig. 1, in the same second positive electrode insulating block array 22, the second parallel positive electrode insulating blocks 221 are arranged at intervals on the positive electrode fine gate line 11 in the horizontal direction. Moreover, the second parallel positive electrode insulating block 221 is disposed on the positive electrode fine grid line 11 without the first parallel positive electrode insulating block 211, that is, on the same positive electrode fine grid line 11, the first parallel positive electrode insulating block 211 and the second parallel positive electrode insulating block 221 do not occur at the same time. The first parallel positive electrode insulating block 211 and the second parallel positive electrode insulating block 221 have an insulating function on the very fine grid lines 11 at their respective corresponding positions.
The first parallel positive electrode insulating block 211 and the second parallel positive electrode insulating block 221 are respectively provided with a first conductive segment 31 for connecting two adjacent negative electrode fine grid lines 12. The first conductive segments 31 serve as conductive connections to the adjacent negative fine grid lines 12 at their respective corresponding positions.
The negative electrode fine grid line 12 is provided with a first negative electrode insulation block array 23 and a second negative electrode insulation block array 24 in the vertical direction, the first negative electrode insulation block array 23 and the second negative electrode insulation block array 24 are provided with a plurality of negative electrode insulation block arrays, the first negative electrode insulation block array 23 and the second negative electrode insulation block array 24 are alternately arranged, the second negative electrode insulation block array 24 is located between the adjacent first negative electrode insulation block arrays 23, the first negative electrode insulation block array 23 is also located between the adjacent second negative electrode insulation block arrays 24, and the first negative electrode insulation block array 23 or the second negative electrode insulation block array 24 can be located at the end part of the negative electrode fine grid line 12.
The first negative electrode insulating block array 23 includes a plurality of first parallel negative electrode insulating blocks 231 arranged at intervals on the negative electrode fine gate line 12, as shown in fig. 1, in the same first negative electrode insulating block array 23, the first parallel negative electrode insulating blocks 231 are provided, and in the horizontal direction, each first parallel negative electrode insulating block 231 is arranged at intervals on the negative electrode fine gate line 12. The second negative electrode insulating block array 24 includes a plurality of second parallel negative electrode insulating blocks 241 arranged at intervals on the negative electrode fine gate line 12, as shown in fig. 1, in the same second negative electrode insulating block array 24, a plurality of second parallel negative electrode insulating blocks 241 are arranged, and in the horizontal direction, each second parallel negative electrode insulating block 241 is arranged at intervals on the negative electrode fine gate line 12. Moreover, the second parallel negative electrode insulating block 241 is disposed on the negative electrode fine grid line 12 without the first parallel negative electrode insulating block 231, that is, on the same negative electrode fine grid line 12, the first parallel negative electrode insulating block 231 and the second parallel negative electrode insulating block 241 do not occur at the same time. The first parallel negative electrode insulating block 231 and the second parallel negative electrode insulating block 241 have an insulating effect on the negative electrode fine gate line 12 at their respective corresponding positions.
The first parallel negative electrode insulating block 231 and the second parallel negative electrode insulating block 241 are respectively provided with a second conductive segment 32 for connecting two adjacent positive electrode fine grid lines 11. The second conductive segments 32 are electrically connected to the adjacent positive fine gate lines 11 at their respective corresponding positions.
The first conductive segment 31 at the first edge of the first cell piece is connected with the second conductive segment 32 at the edge of the second cell piece adjacent to the first cell piece, and the polarity flow direction of the negative electrode and the positive electrode is realized in the first cell piece and the second cell piece through the conductive action of the first conductive segment 31 and the second conductive segment 32. The second conductive segment 32 at the second edge opposite to the first edge is connected to the first conductive segment 31 at the edge of the third cell piece adjacent to the first cell piece, and in the first cell piece and the third cell piece, the polarity flow direction of the positive electrode and the negative electrode is realized through the conductive action of the second conductive segment 32 and the first conductive segment 31.
It should be noted that, the first battery piece is adjacent to the second battery piece and the third battery piece respectively, which may be adjacent to each other left and right as shown in fig. 1, or adjacent to each other up and down, specifically depending on the arrangement of the battery pieces 100. In addition, "first", "second", and "third" of the first cell, the second cell, and the third cell are only used to distinguish the respective cells 100, and are not limited to the number of the cells 100, that is, the back contact battery string is not limited to only three cells 100.
In the utility model, the back contact battery string comprises at least one battery piece 100, the battery piece 100 comprises a P-type doped region provided with an anode fine grid line 11 and an N-type doped region provided with a cathode fine grid line 12, the anode fine grid line 11 is in conductive connection through a second conductive segment 32 and is insulated through a first anode insulating block array 21 and a second anode insulating block array 22, the cathode fine grid line 12 is in conductive connection through a first conductive segment 31 and is insulated through a first cathode insulating block array 23 and a second cathode insulating block array 24, and adjacent battery pieces 100 are also in conductive connection through the first conductive segment 31 and the second conductive segment 32. The cell 100 of the back contact cell string does not need to be provided with a main grid, and the photoelectric conversion efficiency of the cell 100 is high; the positive electrode fine grid lines 11 are in conductive connection through the second conductive segments 32, the second conductive segments 32 are arranged at intervals, the negative electrode fine grid lines 12 are in conductive connection through the first conductive segments 31, and the first conductive segments 31 are also arranged at intervals, so that the metal consumption can be reduced, and the cost of the battery piece 100 is greatly reduced; in addition, the back contact battery string can be made into a film pasting structure and directly pasted to form a battery assembly, a high-temperature welding process is not needed, and the battery piece 100 is prevented from being damaged; the back contact battery string is not required to be connected through a welding strip, so that the problem of stress of the battery piece 100 is avoided, and the reliability of the battery piece 100 is greatly improved.
Example two
Referring to fig. 4, on the basis of the first embodiment, the back contact battery string of the second embodiment further includes a first conductive bus bar at an end thereof and a second conductive bus bar at the other end thereof, the first conductive segment 31 is bussed to the first conductive bus bar, and the second conductive segment 32 is bussed to the second conductive bus bar.
In the present embodiment, in each cell 100 of the back contact cell string, the current guided by the negative electrode fine grid line 12 is collected and collected to the first conductive bus bar through the first conductive segment 31, and the current guided by the positive electrode fine grid line 11 is collected and collected to the second conductive bus bar through the second conductive segment 32. Referring to fig. 4, when the first conductive bus bar and the second conductive bus bar are provided, the first conductive segment 31, the second conductive segment 32, the first positive insulating block array 21, the second positive insulating block array 22, the first negative insulating block array 23, and the second negative insulating block array 24 of adjacent battery pieces 100 are arranged in the same manner and are in translational symmetry. Referring to fig. 2, when the first conductive bus bar and the second conductive bus bar are not provided, the first conductive segment 31, the second conductive segment 32, the first positive insulating block array 21, the second positive insulating block array 22, the first negative insulating block array 23, and the second negative insulating block array 24 of adjacent battery pieces 100 are arranged in different ways, and are in mirror symmetry.
EXAMPLE III
On the basis of the first embodiment, the battery pieces 100 of the third embodiment are connected through the interconnection bars. The interconnection bars bus the current of the respective battery cells 100, thereby achieving series connection between the respective battery cells 100.
Example four
On the basis of the first embodiment, the first conductive segment 31 and/or the second conductive segment 32 of the fourth embodiment include a metal film and a composite film partially wrapping the metal film.
This embodiment can be realized by that the first conductive segment 31 includes a metal film and a composite film partially wrapping the metal film. Alternatively, the second conductive segment 32 includes a metal film and a composite film partially wrapping the metal film. Alternatively, each of the first conductive segment 31 and the second conductive segment 32 includes a metal film and a composite film partially wrapping the metal film.
The metal film includes a conductive material (such as copper, aluminum, or other suitable conductive materials, with or without tin, silver, nickel, or other coating or organic solderability preservative), and the composite film covers the end of the metal film away from the positive fine grid line 11 and the negative fine grid line 12. At this time, when the first conductive segment 31 and the second conductive segment 32 are connected in series between the battery pieces 100 to form a battery string, the first conductive segment 31 and the second conductive segment 32 can be attached to the battery pieces 100 in a pasting manner, and the composite film can fixedly connect the first conductive segment 31 and the second conductive segment 32 with the negative fine grid line 12 and the positive fine grid line 11 on the battery pieces 100 more tightly, so that the problem of warping of the battery pieces 100 caused by stress is solved.
EXAMPLE five
On the basis of the fourth embodiment, the composite film of the fifth embodiment is a POE film, an EVA film, a PVB film, or a co-extruded film composed of POE and EVA.
In the above description, POE (hereinafter, referred to as Polyolefin elastomer) refers to a Polyolefin elastomer, EVA (hereinafter, referred to as Ethylene Vinyl Acetate Copolymer) refers to a polyethylene-polyvinyl Acetate Copolymer, and PVB (hereinafter, referred to as polyvinyl butyral) refers to polyvinyl butyral.
Example six
In the sixth embodiment, the first conductive segment 31 and/or the second conductive segment 32 are/is a metal film.
This embodiment is realized in such a way that the first conductive segment 31 is a metal film. The second conductive segment 32 is a metal film. The first conductive segment 31 and the second conductive segment 32 are both metal films.
The first conductive segment 31 can be pasted and connected to the adjacent negative fine grid line 12, and the second conductive segment 32 can be pasted and connected to the adjacent positive fine grid line 11.
EXAMPLE seven
On the basis of the first embodiment, the positive fine gate line 11 of the seventh embodiment is an aluminum gate line, a silver-aluminum gate line, a copper gate line, or a silver-clad copper gate line.
Example eight
On the basis of the first embodiment, the negative electrode fine grid line 12 of the eighth embodiment is an aluminum grid line, a silver-aluminum grid line, a copper grid line, or a silver-clad copper grid line.
With reference to the seventh embodiment, the positive electrode fine grid line 11 or the negative electrode fine grid line 12 is an aluminum grid line, a silver-aluminum grid line, a copper grid line, or a silver-clad copper grid line. It can be understood that in the embodiment of the present invention, the positive fine gate line 11 and the negative fine gate line 12 may be selected to select the gate lines of the same or different metal types, for example, the positive fine gate line 11 and the negative fine gate line 12 are both selected to be aluminum gate lines; or the positive electrode thin grid line 11 is an aluminum grid line, and the negative electrode thin grid line 12 is a silver grid line. When the anode fine grid line 11 or the cathode fine grid line 12 is an aluminum grid line or a silver grid line, the aluminum grid line or the silver grid line is printed on the P-type doped region or the N-type doped region in a screen printing mode; when the anode fine gate line 11 or the cathode fine gate line 12 is a copper gate line, it is plated on the P-type doped region or the N-type doped region by electroplating or evaporation.
Example nine
This example ninth provides a back contact battery assembly including the back contact battery string as described in examples one to eight.
Specifically, the assembly process of the back contact battery pack includes the following steps:
1. battery sorting: because the production line of the solar cell pieces 100 has strong randomness and the performances of the produced cells are different, in order to effectively combine the cell pieces 100 with consistent or similar performances, the cell pieces 100 are classified according to the performance parameters measured by the cell test, so that the utilization rate of the cell pieces 100 is improved, and the cell assembly with qualified quality is manufactured. The battery test is to test the output parameters (current and voltage) of the battery.
2. And (2) connecting in series: the first conducting segment 31, the second conducting segment 32, the first positive insulating block array 21, the second positive insulating block array 22, the first negative insulating block array 23 and the second negative insulating block array 24 are arranged on the battery pieces 100, so that the series connection of the battery pieces 100 is realized.
3. Laminating: after the back is connected in series and is qualified through inspection, glass, the cut EVA (ethylene vinyl acetate)/POE (polyolefin elastomer) film, the battery string, the EVA film/POE film, the glass fibers and the back plate/glass are sequentially laid from bottom to top, the relative positions of the battery string and the glass and other materials are ensured when the battery string is laid, and the distance between the battery pieces 100 is adjusted.
4. And (3) laminating the components: and (3) putting the laminated battery piece 100 into a laminating machine, vacuumizing to exhaust air in the assembly, heating to melt EVA to bond the battery, the glass and the back plate together, and finally cooling and taking out the assembly.
5. Trimming: because the EVA is melted during lamination and extends outwards due to pressure to be solidified to form burrs, the burrs are cut off after lamination.
6. Framing: and an aluminum frame is arranged on the component, so that the strength of the component is increased, the battery component is further sealed, and the service life of the battery is prolonged. Wherein the gaps between the frames and the glass assembly are filled with silicone resin, and the frames are connected by corner keys.
7. Bonding a junction box: a box is adhered to the lead at the back of the assembly to facilitate connection between the battery and other equipment or batteries.
8. And (3) testing the components: and testing and calibrating the output power of the battery, testing the output characteristic of the battery, and determining the quality grade of the component.
9. High-pressure test: certain voltage is applied between the frame of the component and the electrode lead, and the voltage resistance and the insulating strength of the component are tested so as to ensure that the component is not damaged under severe natural conditions (such as lightning stroke and the like).
In the back contact battery string of the present invention, the back contact battery string includes at least one battery piece 100, the battery piece 100 includes a P-type doped region provided with an anode fine grid line 11 and an N-type doped region provided with a cathode fine grid line 12, the anode fine grid line 11 is conductively connected through a second conductive segment 32 and insulated through a first anode insulating block array 21 and a second anode insulating block array 22, the cathode fine grid line 12 is conductively connected through a first conductive segment 31 and insulated through a first cathode insulating block array 23 and a second cathode insulating block array 24, and the adjacent battery pieces 100 are conductively connected through the first conductive segment 31 and the second conductive segment 32. The cell 100 of the back contact cell string does not need to be provided with a main grid, and the photoelectric conversion efficiency of the cell 100 is high; the positive electrode thin grid lines 11 are in conductive connection through the second conductive segments 32, the second conductive segments 32 are arranged at intervals, the negative electrode thin grid lines 12 are in conductive connection through the first conductive segments 31, and the first conductive segments 31 are also arranged at intervals, so that the metal consumption can be reduced, and the cost of the battery piece 100 is greatly reduced; in addition, the back contact battery string can be made into a film pasting structure and directly pasted to form a battery assembly, a high-temperature welding process is not needed, and the battery piece 100 is prevented from being damaged; the back contact battery string is not required to be connected through a welding strip, so that the problem of stress of the battery piece 100 is avoided, and the reliability of the battery piece 100 is greatly improved.
Example ten
This example provides a back contact battery system comprising the back contact battery assembly of example nine.
In the back contact battery string of the present invention, the back contact battery string includes at least one battery piece 100, the battery piece 100 includes a P-type doped region provided with an anode fine grid line 11 and an N-type doped region provided with a cathode fine grid line 12, the anode fine grid line 11 is conductively connected through a second conductive segment 32 and insulated through a first anode insulating block array 21 and a second anode insulating block array 22, the cathode fine grid line 12 is conductively connected through a first conductive segment 31 and insulated through a first cathode insulating block array 23 and a second cathode insulating block array 24, and the adjacent battery pieces 100 are conductively connected through the first conductive segment 31 and the second conductive segment 32. The cell 100 of the back contact cell string does not need to be provided with a main grid, and the photoelectric conversion efficiency of the cell 100 is high; the positive electrode fine grid lines 11 are in conductive connection through the second conductive segments 32, the second conductive segments 32 are arranged at intervals, the negative electrode fine grid lines 12 are in conductive connection through the first conductive segments 31, and the first conductive segments 31 are also arranged at intervals, so that the metal consumption can be reduced, and the cost of the battery piece 100 is greatly reduced; in addition, the back contact battery string can be made into a film pasting structure and directly pasted to form a battery assembly, a high-temperature welding process is not needed, and the battery piece 100 is prevented from being damaged; the back contact battery string is not required to be connected through a welding strip, so that the problem of stress of the battery piece 100 is avoided, and the reliability of the battery piece 100 is greatly improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A back contact battery string, comprising:
each cell comprises a P-type doping region and an N-type doping region which are alternately arranged, the P-type doping region is provided with a positive thin grid line, and the N-type doping region is provided with a negative thin grid line;
a first positive electrode insulation block array and a second positive electrode insulation block array are arranged on the positive electrode fine grid line in the vertical direction, and the second positive electrode insulation block array is positioned between two adjacent first positive electrode insulation block arrays;
the first positive electrode insulating block array comprises first parallel positive electrode insulating blocks arranged on the positive electrode fine grid lines at intervals, the second positive electrode insulating block array comprises second parallel positive electrode insulating blocks arranged at intervals, and the second parallel positive electrode insulating blocks are arranged on the positive electrode fine grid lines without the first parallel positive electrode insulating blocks;
the first parallel positive electrode insulating block and the second parallel positive electrode insulating block are respectively provided with a first conductive section for connecting two adjacent negative electrode fine grid lines;
the negative electrode fine grid line is provided with a first negative electrode insulating block array and a second negative electrode insulating block array in the vertical direction, and the second negative electrode insulating block array is positioned between two adjacent first negative electrode insulating block arrays;
the first negative electrode insulating block array comprises first parallel negative electrode insulating blocks arranged on the negative electrode fine grid lines at intervals, the second negative electrode insulating block array comprises second parallel negative electrode insulating blocks arranged at intervals, and the second parallel negative electrode insulating blocks are arranged on the negative electrode fine grid lines without the first parallel negative electrode insulating blocks;
the first parallel negative electrode insulating block and the second parallel negative electrode insulating block are respectively provided with a second conducting section for connecting two adjacent positive electrode thin grid lines;
the first conductive segment at the first edge of the first battery piece is connected with the second conductive segment at the edge of the second battery piece adjacent to the first battery piece;
the second conductive segment at a second edge opposite the first edge connects the first conductive segment at an edge of a third cell piece adjacent the first cell piece.
2. The back contact cell string of claim 1, further comprising a first conductive bus bar at an end thereof and a second conductive bus bar at another end thereof, the first conductive segment being bussed to the first conductive bus bar and the second conductive segment being bussed to the second conductive bus bar.
3. The back contact cell string according to claim 1, wherein the cell sheets are connected to each other by an interconnection bar.
4. The back contact string as defined in claim 1, wherein the first conductive segment and/or the second conductive segment comprises a metal film and a composite film partially wrapping the metal film.
5. The back contact battery string according to claim 4, wherein the composite film is a POE film, an EVA film, a PVB film, or a co-extruded film of POE and EVA.
6. The back contact battery string of claim 1, wherein the first conductive segment and/or the second conductive segment is a metal film.
7. The back contact battery string according to claim 1, wherein the positive fine grid lines are aluminum grid lines, silver aluminum grid lines, copper grid lines, or silver-clad copper grid lines.
8. The back contact battery string according to claim 1, wherein the negative fine grid line is an aluminum grid line, a silver aluminum grid line, a copper grid line, or a silver-clad copper grid line.
9. A back contact battery assembly, comprising the back contact battery string of any of claims 1-8.
10. A back contact battery system, comprising the back contact battery assembly of claim 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220295788.3U CN216719962U (en) | 2022-02-14 | 2022-02-14 | Back contact battery string, back contact battery assembly and back contact battery system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220295788.3U CN216719962U (en) | 2022-02-14 | 2022-02-14 | Back contact battery string, back contact battery assembly and back contact battery system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117276378A (en) * | 2023-09-19 | 2023-12-22 | 隆基绿能科技股份有限公司 | Solar cell array |
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- 2022-02-14 CN CN202220295788.3U patent/CN216719962U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117276378A (en) * | 2023-09-19 | 2023-12-22 | 隆基绿能科技股份有限公司 | Solar cell array |
| CN117276378B (en) * | 2023-09-19 | 2024-04-30 | 隆基绿能科技股份有限公司 | A solar cell array and a splicing method thereof |
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