CN112038435A - Heterojunction battery assembly and preparation method thereof - Google Patents
Heterojunction battery assembly and preparation method thereof Download PDFInfo
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- CN112038435A CN112038435A CN202011040756.0A CN202011040756A CN112038435A CN 112038435 A CN112038435 A CN 112038435A CN 202011040756 A CN202011040756 A CN 202011040756A CN 112038435 A CN112038435 A CN 112038435A
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- 238000002360 preparation method Methods 0.000 title abstract description 11
- 238000005520 cutting process Methods 0.000 claims abstract description 85
- 238000003466 welding Methods 0.000 claims abstract description 72
- 238000003475 lamination Methods 0.000 claims abstract description 16
- 238000003491 array Methods 0.000 claims abstract description 3
- 229910000679 solder Inorganic materials 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 34
- 238000010030 laminating Methods 0.000 claims description 13
- 238000004806 packaging method and process Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 abstract description 6
- 230000000712 assembly Effects 0.000 abstract 1
- 238000000429 assembly Methods 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 131
- 238000005336 cracking Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000003698 laser cutting Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/06—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices characterised by potential barriers
- H01L31/072—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices characterised by potential barriers the potential barriers being only of the PN heterojunction type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a heterojunction battery pack which comprises a plurality of heterojunction battery cell slice assemblies formed by a plurality of arrays, wherein the orientation of the cutting end face of each battery cell slice in the original heterojunction battery pack is adjusted, so that a welding strip between adjacent battery cell slices is not in contact with a mechanical breaking part on the cutting end face of the battery cell slice, and therefore, the welding strip cannot form extrusion force on the rugged mechanical breaking part during lamination, the probability of hidden breakage of the battery cell is reduced, and the yield of products is improved. The invention also provides a preparation method of the heterojunction battery component.
Description
Technical Field
The invention relates to the field of battery assembly preparation, in particular to a heterojunction battery assembly and a preparation method thereof.
Background
In the production process of the battery pack, in order to reduce cost, manufacturers generally reduce the thickness of a battery piece in the battery pack, so that the capacity of preventing the battery piece from being damaged mechanically is reduced, and the hidden cracking risk of the battery piece is increased. The current generated by the battery piece needs to be collected and led out by means of the main grid lines on the surface of the battery piece and the thin grid lines perpendicular to the main grid lines, but when the battery piece is subfissure, the thin grid lines are broken, the current cannot be transmitted to the main grid lines through the thin grid lines, and finally, the battery piece cannot work partially or even completely.
In the conventional cell production, each cell is generally half-cut to form two cell slices, then the cell slices of a plurality of cells are connected by a solder strip, and the cell slices, the solder strip and the packaging layer are fixed by a lamination process to form a cell assembly. The scribing process of the battery piece generally adopts a laser scribing method, namely: and carrying out laser cutting on the battery piece by adopting a laser scribing machine along the direction vertical to the main grid line for a preset depth, and then dividing the battery piece into two battery piece slices in a mechanical piece breaking mode. Specifically, as shown in fig. 1, the battery piece is half-cut to form a battery piece cut piece 1, one end of which is a cut end face 5 (the cut end face 5 is an end face of the battery piece formed after the battery piece is cut by the dicing process), and the other end of which is a non-cut end face 8 (the non-cut end face 8 is an end face of the battery piece that is not cut by the dicing process). Due to the difference between laser cutting and mechanical sheet breaking, the cut end face 5 of the formed battery sheet slice 1 comprises two parts: a laser scribing portion 51 and a mechanical breaking portion 52. The laser scribing part 51 is a part cut by a laser cutting machine, and the surface of the part is smooth and flat; and the mechanical breaking portion 52 refers to a portion broken in a mechanical breaking manner, the surface of which is uneven due to stress. In general, when the conventional battery piece is half-cut, the battery piece is usually cut from the back surface 6 of the battery piece, and especially for a PERC (Passivated Emitter and Rear Cell) battery piece, the battery piece is cut from the back surface 6 of the battery piece when the battery piece is half-cut. Therefore, for the battery piece cut sheet 1 formed after the conventional battery piece half-piece cutting, the laser scribing part 51 in the cutting end face 5 of the battery piece cut sheet 1 is a part close to the back face 6 of the battery piece, and the mechanical breaking part 52 is a part close to the front face 7 of the battery piece.
However, for the heterojunction battery, due to the structural characteristics of the cell of the heterojunction battery, when the cell of the heterojunction battery is half-cut, laser scribing needs to be performed from the front of the cell for a preset depth, and then the cell is divided into two cell slices by mechanical breaking, as shown in fig. 2, the cutting end surface 5 of the cell slice 1 of the heterojunction cell is different from the cutting end surface 5 of the conventional cell slice 1, that is: the laser scribed portion 51 is the portion near the front side 7 of the cell piece and the mechanical break-off portion 52 is the portion near the back side 6 of the cell piece.
The preparation method of the battery module in the prior art generally comprises the processes of cleaning, printing, cutting, typesetting, packaging, laminating and the like. Namely, after each printed battery piece is half-cut, two battery piece slices are formed, then the battery piece slices are typeset according to a preset typesetting mode to form a battery assembly, and then the battery assembly is packaged, laminated and the like to finally form a battery assembly finished product. When the battery piece slices are typeset, the adjacent battery piece slices are connected through the welding strips.
With reference to fig. 3-4, when the cell slice 1 of the heterojunction cell is laminated in the existing cell preparation method, since the distribution positions of the laser scribing portion 51 and the mechanical breaking portion 52 in the cutting end surface 5 of each cell slice 1 are opposite to the distribution positions of the laser scribing portion 51 and the mechanical breaking portion 52 in the cutting end surface 5 of the conventional cell slice 1, when the cell component is laminated, the mechanical breaking portion 52 of the cutting section 5 of the cell slice 1 contacts with the solder ribbon 2, and during lamination, the solder ribbon 2 is likely to form an extrusion force on the uneven mechanical breaking portion 52, thereby increasing the probability of cracking of the laminated cell slice and the possibility of breaking of fine grid lines on the cell slice, and causing partial or total failure of the cell slice.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the objects of the present invention is to provide a heterojunction battery assembly, which can solve the problems of the prior art, such as the risk of subfissure after lamination.
The second purpose of the invention is to provide a preparation method of a heterojunction battery pack, which can solve the problem that the existing heterojunction battery pack has hidden crack risk after lamination.
One of the purposes of the invention is realized by adopting the following technical scheme:
a heterojunction battery assembly comprises a plurality of battery piece slice arrays, wherein a first end of each battery piece slice is a cutting end face, and a second end of each battery piece slice is a non-cutting end face; the cutting end face of the battery piece cutting comprises a laser scribing part close to the front face of the battery piece and a mechanical breaking part close to the back face of the battery piece; the plurality of battery slice slices form a battery slice group used as positive electrode output and a battery slice group used as negative electrode output; each battery slice group comprises n battery slices which are sequentially connected through welding strips;
wherein, as the positive pole output battery slice group: the ith battery piece slice and the (i + 1) th battery piece slice are electrically connected through a welding strip, a first part of the welding strip is placed on the back surface of the battery piece close to the non-cutting end surface of the ith battery piece slice, a second part of the welding strip is placed on the front surface of the battery piece close to the cutting end surface of the (i + 1) th battery piece slice, and the middle part of the welding strip is arranged between the ith battery piece slice and the (i + 1) th battery piece slice; when the heterojunction battery assembly is laminated, the mechanical breaking part of the (i + 1) th battery piece slice is arranged on one surface far away from the welding strip;
cell slice group as negative output: the jth battery piece slice and the (j + 1) th battery piece slice are electrically connected through a welding strip, a first part of the welding strip is placed on the front surface of the battery piece close to the cutting end surface of the jth battery piece slice, a second part of the welding strip is stacked on the back surface of the battery piece close to the non-cutting end surface of the (j + 1) th battery piece slice, and the middle part of the welding strip is arranged between the jth battery piece slice and the (j + 1) th battery piece slice; when the heterojunction battery assembly is laminated, the mechanical breaking part of the jth battery piece slice is arranged on one surface far away from the welding strip; i, j ∈ [1, n ].
Further, the heterojunction cell assembly comprises a bus bar; the two battery piece slice groups used as the anode output are respectively marked as a first battery piece slice group and a second battery piece slice group; the first battery piece slice group and the second battery piece slice group are symmetrically arranged by the bus bar, and the non-cutting end surface of each battery piece slice in the first battery piece slice group and the second battery piece slice group faces the bus bar;
the two battery piece slice groups used as the negative electrode output are respectively marked as a third battery piece slice group and a fourth battery piece slice group, the third battery piece slice group and the fourth battery piece slice group are symmetrically arranged with the bus bar, and the cutting end surface of each battery piece slice in the third battery piece slice group and the fourth battery piece slice group faces the bus bar.
Furthermore, the first cell slice group and the third cell slice group are arranged on one side of the bus bar, the second cell slice group and the fourth cell slice group are arranged on the other side of the bus bar, and the first cell slice group and the third cell slice group are sequentially arranged in an alternating row or column along the direction of the bus bar.
Further, a preset gap is arranged between adjacent cell slices in each cell slice group, the middle part of each welding strip is arranged in the preset gap between the corresponding adjacent cell slices, and the mechanical breaking-off part of each cell slice is positioned above the middle part of the corresponding welding strip when the heterojunction cell assembly is laminated.
The second purpose of the invention is realized by adopting the following technical scheme:
a method of making a heterojunction battery assembly, the method of making comprising:
cutting process: carrying out half-piece cutting on the printed heterojunction battery piece from the front side of the battery piece of the heterojunction battery piece to form a battery piece slice; one end of each battery piece slice is a cutting end face, and the other end of each battery piece slice is a non-cutting end face; the cutting end face comprises a laser scribing part close to the front surface of the battery piece and a mechanical breaking part close to the back surface of the battery piece;
typesetting flow: the plurality of battery piece slices are arranged according to the arrangement mode of the plurality of battery piece slices in the heterojunction battery pack adopted by one of the purposes of the invention to form the heterojunction battery pack;
and (3) laminating flow: and (5) carrying out lamination treatment on the heterojunction battery assembly.
Further, the typesetting process comprises an uploading process: and sequentially transporting each battery piece slice, and adjusting the orientation of the cutting end face and the non-cutting end face of each battery piece slice in the transportation process, so that the mechanical breaking part of each battery piece slice does not contact with the welding strip when each battery piece slice reaches the typesetting equipment for typesetting.
Further, the adjusting the orientation of the cut end face and the non-cut end face of each battery piece slice during the transportation process comprises rotating the corresponding battery piece slice 180 degrees in the horizontal direction or 180 degrees in the vertical direction.
Further, the lamination process comprises: and arranging corresponding packaging layers on the front side and the back side of the battery piece, and then laminating the packaging layers, the battery piece slices and the welding strips through a laminating process.
Compared with the prior art, the invention has the beneficial effects that:
according to the method, the typesetting mode of the battery piece slices in the existing preparation method of the battery assembly is improved, namely, the orientation of the cutting end face of each battery piece slice is adjusted, so that the solder strip is not in contact with the mechanical breaking part, the solder strip cannot form extrusion force on the mechanical breaking part during lamination, the probability of hidden cracking of the battery pieces is greatly reduced, and the yield of products is improved; meanwhile, the invention only adjusts the orientation of each cell slice of the cell slices, and does not change the equipment and the flow related to the existing preparation process, thereby realizing the production of the heterojunction cell assembly and saving the cost.
Drawings
FIG. 1 is a schematic structural diagram of a sliced cell slice after the slicing of the cell slice of a conventional cell;
FIG. 2 is a schematic structural diagram of a cell slice after the cell slice of the heterojunction cell is diced;
fig. 3 is a schematic view of a laminated structure of a cell slice, a solder ribbon, and an encapsulation layer of a battery module when the heterojunction battery module is manufactured using a conventional battery module manufacturing method;
FIG. 4 is an enlarged view of the connection structure of the battery slice and the solder strip in FIG. 3;
fig. 5 is a schematic view of the connection of adjacent cell slice and solder strip in the heterojunction cell assembly provided by the invention;
fig. 6 is a schematic view of a laminated structure of a cell slice, a solder strip and an encapsulation layer of the heterojunction cell assembly provided by the invention when the heterojunction cell assembly is prepared;
FIG. 7 is an enlarged view of the connection structure of the battery slice and the solder strip in FIG. 6;
fig. 8 is a layout diagram of the heterojunction battery assembly provided by the invention.
In the figure: 1. slicing the battery piece; 2. welding a strip; 3. a back side packaging layer; 4. a front side packaging layer; 5. cutting an end face; 51. laser scribing part; 52. a mechanical breaking-off portion; 6. the back surface of the battery piece; 7. the front side of the battery piece; 8. a non-cutting end face; 9. a bus bar; 11. slicing a first battery piece; 12. slicing a second battery piece; 13. slicing a third battery piece; 14. slicing a fourth cell slice; 21. a first portion; 22. a second portion; 23. a middle portion.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Example one
The invention provides a preferred embodiment, and provides a heterojunction battery assembly, which does not need to change any related devices in a slicing process and a laminating process of battery pieces, and only needs to adjust the orientation of a plurality of battery piece slices in the battery assembly, so that a mechanical breaking part of a cutting end surface of each battery piece slice in the heterojunction battery assembly is far away from a welding strip and is not contacted with the welding strip.
Preferably, the present invention provides a heterojunction battery assembly comprising a sliced array of a plurality of heterojunction batteries.
The cell slice is formed by cutting the heterojunction cell through a cutting process. Two cell slice slices are formed after cutting one heterojunction cell slice. As shown in fig. 2, each of the battery piece cut pieces 1 includes a cut end surface 5 and a non-cut end surface 8. The cut end face 5 includes a laser scribed portion 51 adjacent the front side 7 of the cell piece and a mechanical break-off portion 52 adjacent the back side 6 of the cell piece.
Specifically, in general, a battery includes a positive electrode and a negative electrode. Therefore, the plurality of cell slice slices in the heterojunction cell assembly can be divided into a cell slice group serving as a positive electrode output and a cell slice group serving as a negative electrode output according to different positive and negative electrodes.
Each battery piece slice group comprises a plurality of battery piece slices which are sequentially connected through welding strips. That is, two adjacent cell slices in each cell slice group are electrically connected through a welding strip.
The distribution positions of the mechanical breaking parts and the laser scribing parts in the cutting end surfaces of the cell slices of the heterojunction cell are different from the distribution positions of the mechanical breaking parts and the laser scribing parts in the cutting end surfaces of the conventional cell slices, so that when the heterojunction cell assembly is laminated, a welding strip between two adjacent cell slices is in contact with the mechanical breaking parts of each cell slice, the mechanical breaking parts are easily extruded, and the probability of hidden cracking of the laminated cell slices is increased. Therefore, the orientation of the cutting end face of each battery piece slice in the heterojunction battery assembly is adjusted, so that the welding strip between the adjacent battery piece slices is not contacted with the mechanical breaking part of the cutting end face of the battery piece slice during lamination, the welding strip cannot generate extrusion force on the mechanical breaking part, the probability of hidden cracking of the battery piece is greatly reduced, and the yield of products is improved.
Preferably, for convenience of explaining the connection structure between the cell slice and the solder strip in the present invention, to explain how the present invention adjusts the orientation of the cut end surface of the cell slice so that the solder strip does not contact with the mechanical breaking part of the cut end surface of the cell slice, the present embodiment sets that each cell slice group includes n cell slices connected in sequence by the solder strip. Wherein n is more than or equal to 2, and n is a natural number.
Preferably, the number of the cell slices in the cell slice group as the positive electrode output is the same as the number of the cell slices in the cell slice group as the negative electrode output, and the cell slice group as the positive electrode output and the cell slice group as the negative electrode output are sequentially and alternately arranged, such as alternately arranged in rows or alternately arranged in columns.
Among them, for the cell slice group as the positive electrode output:
the battery piece slice group comprises n battery piece slices sequentially connected by a welding strip, wherein each battery piece slice is marked as the ith battery piece slice, and i belongs to [1, n ].
Specifically, the method comprises the following steps: the ith battery piece slice and the (i + 1) th battery piece slice are electrically connected through a welding strip, a first part of the welding strip is placed on the back surface of the battery piece close to the non-cutting end surface of the ith battery piece slice, a second part of the welding strip is placed on the front surface of the battery piece close to the cutting end surface of the (i + 1) th battery piece slice, and the middle part of the welding strip is arranged between the ith battery piece slice and the (i + 1) th battery piece slice; when the heterojunction battery assembly is laminated, the mechanical breaking part of the i +1 th cell slice is arranged on one surface far away from the solder strip.
As shown in fig. 5, a schematic diagram of the positional relationship between two adjacent cut pieces of battery pieces and solder strips is given in this embodiment: two adjacent battery slice slices are respectively marked as a first battery slice 11 and a second battery slice 12, a first part 21 of the welding strip is placed on the back surface of the battery slice close to the non-cutting end surface of the first battery slice 11, a second part 22 of the welding strip is placed on the front surface of the battery slice close to the cutting end surface of the second battery slice 12, and a middle part 22 of the welding strip is arranged between the first battery slice 11 and the second battery slice 12. As can be seen from fig. 5, the mechanical breaking portion 52 of the cut end surface of the second cell piece cut 12 is provided on the side away from the solder ribbon without contacting the solder ribbon. That is, the mechanical breaking portion of the cut end face of each of the cell slice groups as the positive electrode output is provided on the face away from the corresponding solder ribbon, without contacting the solder ribbon.
As shown in fig. 6-7, for the schematic diagram of laminating a battery assembly in this embodiment, when the front side of the battery piece is provided with the front side encapsulation layer 4, the back side of the battery piece is provided with the back side encapsulation layer 3, and then the battery assembly is laminated from the back side of the battery piece after the back side of the battery piece faces the laminator, since the mechanical breaking part 52 of the cut end surface of each battery piece slice 1 is located on the side away from the solder strip 2 and is not in contact with the solder strip 2, the solder strip 2 does not form a pressing force on the mechanical breaking part 52, thereby reducing the probability of the laminated battery piece that cracks and improving the yield of the product.
As shown in fig. 3-4, which are schematic structural diagrams of a heterojunction battery assembly laminated according to the conventional typesetting manner of battery slice slices, when a front side packaging layer 4 is disposed on the front side of a battery slice, a back side packaging layer 3 is disposed on the back side of the battery slice, and then the battery assembly is laminated from the back side of the battery slice after the back side of the battery slice faces a laminator, since the mechanical breaking-off part 52 of the cut end surface of each battery slice 1 is in contact with a solder strip, the solder strip easily forms a pressing force on the mechanical breaking-off part 52.
As is apparent from comparison between fig. 6-7 and fig. 3-4, in the present embodiment, after the orientations of the cut end surface and the non-cut end surface of each battery piece slice 1 are adjusted, the mechanical breaking portion 52 of the cut end surface of each battery piece slice 1 is disposed on the surface far away from the solder strip 2 and does not contact with the solder strip 2, so that during lamination, the problem that the solder strip 2 forms a pressing force on the mechanical breaking portion 52 is avoided, thereby reducing the probability of hidden cracks of the laminated battery pieces and greatly improving the yield of the product.
Therefore, the orientation of the cut end face and the non-cut end face of each battery piece slice in the battery piece slice group as the positive electrode output is adjusted, so that when two adjacent battery piece slices are connected through the welding strip, the mechanical breaking part of the cut end face of each battery piece slice does not contact with the welding strip. That is, in the typesetting mode of the battery piece slices in the existing battery pack, the orientation of the cutting end face and the non-cutting end face of each battery piece slice is adjusted, and the structure of the battery piece slices and the structure of the welding strip do not need to be changed at all, so that the probability of the laminated battery pieces that are hidden cracks can be reduced, and the yield of products can be improved.
Similarly, for the cell slice group as the negative output:
the battery piece slice group also comprises n battery piece slices which are sequentially connected by welding strips, each battery piece slice is marked as the jth battery piece slice, and j belongs to [1, n ].
Specifically, the method comprises the following steps: the jth battery piece slice and the (j + 1) th battery piece slice are electrically connected through a welding strip, a first part of the welding strip is overlapped on the front surface of the battery piece close to the cutting end surface of the jth battery piece slice, a second part of the welding strip is overlapped on the back surface of the battery piece close to the non-cutting end surface of the (j + 1) th battery piece slice, and the middle part of the welding strip is arranged between the jth battery piece slice and the (j + 1) th battery piece slice; when the heterojunction cell assembly is laminated, the mechanical breaking part of the jth cell slice is arranged on one surface far away from the solder strip.
Similarly, as shown in fig. 5, any two adjacent cell slices in the cell slice group as the negative electrode output are: the third battery piece slice 13 and the fourth battery piece slice 14, the first part 21 of the welding strip is placed on the front surface of the battery piece close to the cutting end face of the third battery piece slice 13, the second part 22 is placed on the back surface of the battery piece close to the non-cutting end face of the fourth battery piece slice 14, and the middle part 22 is arranged between the third battery piece slice 13 and the fourth battery piece slice 14.
As can be seen from fig. 5, the mechanical breaking portion 52 of the cut end surface of the third cell slice 13 is provided on the side away from the solder ribbon without contacting the solder ribbon. That is, the mechanical breaking-off portion of the cut end face of each of the cell slice groups as the negative electrode output is disposed on the side away from the corresponding solder strip and does not contact the solder strip.
In a similar way, when laminating, the solder strip can not form extrusion force on the mechanical breaking part of the cut end face of each battery piece, the probability of hidden cracking of the battery pieces is reduced, and the yield of products is improved.
Preferably, the heterojunction cell assembly further comprises a bus bar. The cell slice group as the positive electrode output comprises two, which are respectively recorded as: the first battery piece slice group and the second battery piece slice group are symmetrically arranged by a bus bar and are electrically connected through the bus bar. Similarly, the battery slice group as the negative output includes two, which are respectively recorded as: the third cell slice group and the fourth cell slice group are symmetrically arranged by the bus bar and are electrically connected through the bus bar.
The first cell slice group, the second cell slice group, the third cell slice group and the fourth cell slice group respectively comprise n cell slices sequentially connected by welding strips, namely any two adjacent cell slices in the first cell slice group, the second cell slice group, the third cell slice group and the fourth cell slice group are connected through the welding strips, and the mechanical breaking part of the cutting end face of each cell slice is arranged on one face far away from the corresponding welding strips and is not in contact with the welding strips.
Specifically, as shown in fig. 5, the first cell slice group and the second cell slice group as the positive electrode output are electrically connected through the bus bar 9, and the third cell slice group and the fourth cell slice group as the negative electrode output are electrically connected through the bus bar 9. Meanwhile, the non-cutting end face of each cell slice in the first cell slice group and the second cell slice group faces the bus bar 9; the cut end surface of each of the third cell slice group and the fourth cell slice group faces the bus bar 9.
As shown in fig. 8, which is a layout diagram of a plurality of sliced battery pieces 1 of the heterojunction battery assembly according to the embodiment, one end of each sliced battery piece 1 with a chamfer is a cut end face, and the other end without a chamfer is a non-cut end face. Wherein, the mark
The column of cell slices is a cell slice group as the positive electrode output, and the mark
The battery slice is used as a battery slice group of the negative electrode output.
Namely: the non-cutting end face of each battery piece slice 1 in the first battery piece slice group and the second battery piece slice group which are used as the positive electrode output faces the bus bar 9, and the cutting end face is opposite to the non-cutting end face; the cutting end face of each battery piece slice 1 in the third battery piece slice group and the third battery piece slice group as the negative electrode output faces the manifolds 9, and the non-cutting end face is opposite to the cutting end face.
Preferably, the first cell slice group and the second cell slice group are symmetrically arranged with the bus bar 9, and the third cell slice group and the fourth cell slice group are symmetrically arranged with the bus bar 9. The first cell slice group and the third cell slice group are alternately arranged on one side of the bus bar 9, and the second cell slice group and the fourth cell slice group are alternately arranged on the other side of the bus bar 9.
According to the invention, the typesetting of a plurality of battery piece slices in the existing battery assembly is improved, that is, the orientation of the cutting end surface and the non-cutting end surface of each battery piece slice is adjusted, so that the mechanical breaking part of the cutting end surface of each battery piece slice is arranged on the surface far away from the welding strip and is not contacted with the welding strip, the extrusion force of the welding strip on the mechanical breaking part of the cutting end surface of each battery piece slice is avoided during lamination, and the probability of hidden cracking of the battery piece is greatly reduced.
Preferably, as shown in fig. 6-7 and fig. 3-4, the present invention only adjusts the orientation of the battery piece slices 1, that is, after each battery piece slice 1 is horizontally rotated by 180 ° or vertically rotated by 180 °, the orientation of the battery piece slice 1 is changed, that is, the mechanical breaking parts 52 of the cut end surfaces of the battery piece slices 1 are not in contact with the corresponding solder strips 2, and the solder strips 2 do not form a pressing force on the mechanical breaking parts 52 during lamination. The invention has simple operation, does not need any additional complex equipment or flow and the like, and saves the cost.
Example two
Based on the first embodiment, the invention also provides a preparation method of the heterojunction battery assembly, which comprises the following steps:
cutting process: and half-cutting the printed heterojunction battery piece from the front surface of the battery piece of the heterojunction battery piece to form a battery piece cutting piece. One end of each battery piece slice is a cutting end face, and the other end of each battery piece slice is a non-cutting end face. And the cutting end face comprises a laser scribing part close to the front surface of the battery piece and a mechanical breaking part close to the back surface of the battery piece.
Typesetting flow: and typesetting the plurality of battery piece slices to form the heterojunction battery assembly. When the plurality of battery piece slices are typeset, the typesetting mode of the plurality of battery piece slices in the heterojunction battery assembly provided in the first embodiment is adopted, so that the mechanical breaking part of the cutting end face of each battery piece slice is arranged on one face far away from the welding strip and is not in contact with the welding strip.
And (3) laminating flow: and (5) carrying out lamination treatment on the heterojunction battery assembly.
In an actual production process, generally, when typesetting the battery piece slices, each battery piece slice is sequentially conveyed to the corresponding typesetting equipment. Therefore, during the conveying process, the orientation of the battery piece slices is adjusted, so that after each battery piece slice reaches the typesetting equipment, the mechanical breaking-off part of the cutting end face of each battery piece slice does not contact with the corresponding welding strip.
Preferably, when the orientation of the battery piece slices is adjusted according to different welding directions of the welding strips, the following two cases are further divided:
when the welding strip is welded on the battery piece with the right side facing upwards, the battery piece slices in the conveying process are rotated in the horizontal direction; and when the back surface of the battery piece faces the welding strip of the welding strip, the battery piece slice in the conveying process is rotated in the vertical direction. Preferably, the rotation is 180 ° in the horizontal direction and 180 ° in the vertical direction.
Preferably, before the typesetting process, the method further comprises an uploading process: and sequentially transporting each cut battery piece, and adjusting the orientation of the cut end face and the orientation of the non-cut end face of each battery piece in the transportation process.
Preferably, the lamination process further comprises: and arranging corresponding packaging layers on the front side and the back side of the battery piece, and then laminating the packaging layers, the battery piece slices and the welding strips through a laminating process.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (8)
1. A heterojunction battery assembly comprises a plurality of battery piece slice arrays, wherein a first end of each battery piece slice is a cutting end face, and a second end of each battery piece slice is a non-cutting end face; the cutting end face of the battery piece cutting comprises a laser scribing part close to the front face of the battery piece and a mechanical breaking part close to the back face of the battery piece; the method is characterized in that a plurality of battery slices form a battery slice group used as positive electrode output and a battery slice group used as negative electrode output; each battery slice group comprises n battery slices which are sequentially connected through welding strips;
wherein, as the positive pole output battery slice group: the ith battery piece slice and the (i + 1) th battery piece slice are electrically connected through a welding strip, a first part of the welding strip is placed on the back surface of the battery piece close to the non-cutting end surface of the ith battery piece slice, a second part of the welding strip is placed on the front surface of the battery piece close to the cutting end surface of the (i + 1) th battery piece slice, and the middle part of the welding strip is arranged between the ith battery piece slice and the (i + 1) th battery piece slice; when the heterojunction battery assembly is laminated, the mechanical breaking part of the (i + 1) th battery piece slice is arranged on one surface far away from the welding strip;
cell slice group as negative output: the jth battery piece slice and the (j + 1) th battery piece slice are electrically connected through a welding strip, a first part of the welding strip is placed on the front surface of the battery piece close to the cutting end surface of the jth battery piece slice, a second part of the welding strip is stacked on the back surface of the battery piece close to the non-cutting end surface of the (j + 1) th battery piece slice, and the middle part of the welding strip is arranged between the jth battery piece slice and the (j + 1) th battery piece slice; when the heterojunction battery assembly is laminated, the mechanical breaking part of the jth battery piece slice is arranged on one surface far away from the welding strip; i, j ∈ [1, n ].
2. A heterojunction cell assembly according to claim 1, wherein the heterojunction cell assembly comprises a bus bar; the two battery piece slice groups used as the anode output are respectively marked as a first battery piece slice group and a second battery piece slice group; the first battery piece slice group and the second battery piece slice group are symmetrically arranged by the bus bar, and the non-cutting end surface of each battery piece slice in the first battery piece slice group and the second battery piece slice group faces the bus bar;
the two battery piece slice groups used as the negative electrode output are respectively marked as a third battery piece slice group and a fourth battery piece slice group, the third battery piece slice group and the fourth battery piece slice group are symmetrically arranged with the bus bar, and the cutting end surface of each battery piece slice in the third battery piece slice group and the fourth battery piece slice group faces the bus bar.
3. A heterojunction battery assembly according to claim 2, wherein the first cell slice group and the third cell slice group are disposed on one side of the bus bar, the second cell slice group and the fourth cell slice group are disposed on the other side of the bus bar, and the first cell slice group and the third cell slice group are alternately arranged in rows or columns in sequence along the direction of the bus bar.
4. A heterojunction battery assembly according to claim 1, wherein a predetermined gap is provided between adjacent cell slices in each cell slice group, the middle portion of each solder ribbon is provided in the predetermined gap between the corresponding adjacent cell slices, and the mechanical break-off portion of each cell slice is located above the middle portion of the corresponding solder ribbon when the heterojunction battery assembly is laminated.
5. A method of making a heterojunction battery assembly, the method comprising:
cutting process: carrying out half-piece cutting on the printed heterojunction battery piece from the front side of the battery piece of the heterojunction battery piece to form a battery piece slice; one end of each battery piece slice is a cutting end face, and the other end of each battery piece slice is a non-cutting end face; the cutting end face comprises a laser scribing part close to the front surface of the battery piece and a mechanical breaking part close to the back surface of the battery piece;
typesetting flow: the plurality of battery piece slices are arranged according to the arrangement mode of the plurality of battery piece slices in the heterojunction battery assembly as claimed in any one of claims 1 to 4 to form the heterojunction battery assembly;
and (3) laminating flow: and (5) carrying out lamination treatment on the heterojunction battery assembly.
6. The method of manufacturing a heterojunction battery assembly of claim 5, wherein the layout process is preceded by a loading process of: and sequentially transporting each battery piece slice, and adjusting the orientation of the cutting end face and the non-cutting end face of each battery piece slice in the transportation process, so that the mechanical breaking part of each battery piece slice does not contact with the welding strip when each battery piece slice reaches the typesetting equipment for typesetting.
7. The method of claim 6, wherein adjusting the orientation of the cut end face and the non-cut end face of each slice of the cell piece during transportation comprises rotating the corresponding slice of the cell piece 180 ° horizontally or 180 ° vertically.
8. The method of manufacturing a heterojunction battery assembly of claim 5, wherein the lamination process comprises: and arranging corresponding packaging layers on the front side and the back side of the battery piece, and then laminating the packaging layers, the battery piece slices and the welding strips through a laminating process.
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| CN202011040756.0A CN112038435A (en) | 2020-09-28 | 2020-09-28 | Heterojunction battery assembly and preparation method thereof |
| PCT/CN2021/109734 WO2022062655A1 (en) | 2020-09-28 | 2021-07-30 | Heterojunction battery assembly and preparation method therefor |
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| WO2022062655A1 (en) * | 2020-09-28 | 2022-03-31 | 东方日升新能源股份有限公司 | Heterojunction battery assembly and preparation method therefor |
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| CN112038435A (en) * | 2020-09-28 | 2020-12-04 | 东方日升新能源股份有限公司 | Heterojunction battery assembly and preparation method thereof |
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| CN105226124A (en) * | 2015-11-03 | 2016-01-06 | 张家港其辰光伏科技有限公司 | Solar module and preparation method thereof |
| US20200279966A1 (en) * | 2017-09-07 | 2020-09-03 | Longi Solar Technology (Taizhou) Co., Ltd. | Solder strip applied to shingled solar cell module |
| CN210443578U (en) * | 2019-10-10 | 2020-05-01 | 苏州阿特斯阳光电力科技有限公司 | Photovoltaic module |
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| WO2022062655A1 (en) * | 2020-09-28 | 2022-03-31 | 东方日升新能源股份有限公司 | Heterojunction battery assembly and preparation method therefor |
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