WO2022062655A1 - 一种异质结电池组件及其制备方法 - Google Patents

一种异质结电池组件及其制备方法 Download PDF

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WO2022062655A1
WO2022062655A1 PCT/CN2021/109734 CN2021109734W WO2022062655A1 WO 2022062655 A1 WO2022062655 A1 WO 2022062655A1 CN 2021109734 W CN2021109734 W CN 2021109734W WO 2022062655 A1 WO2022062655 A1 WO 2022062655A1
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cell
slice
cell slice
face
heterojunction
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PCT/CN2021/109734
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English (en)
French (fr)
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胡剑鸣
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东方日升新能源股份有限公司
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Publication of WO2022062655A1 publication Critical patent/WO2022062655A1/zh

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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
    • H01L31/042—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
    • 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
    • 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
    • H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • H01L31/1876—Particular processes or apparatus for batch treatment of the devices
    • 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
    • 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
    • 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
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the field of battery assembly preparation, and in particular, to a heterojunction battery assembly and a preparation method thereof.
  • the thickness of the battery cells in the battery module is getting smaller and smaller, which reduces the ability of the cells to prevent mechanical damage, thereby increasing the risk of cracking of the cells.
  • the current generated by the cell needs to be collected and exported by the busbars on the surface of the cell and the thin gridlines perpendicular to the busbars.
  • the thin grid lines are broken, and the current cannot be transported to the main grid lines through the thin grid lines, which eventually leads to partial or even complete failure of the battery cells.
  • one of the objectives of the present application is to provide a heterojunction battery assembly, which can solve the problems of the prior art such as the risk of cracking after lamination of the heterojunction battery assembly.
  • the second purpose of the present application is to provide a method for preparing a heterojunction battery assembly, which can solve the problems of the existing heterojunction battery assembly, such as the risk of cracking after lamination.
  • a heterojunction battery assembly comprises a plurality of cell slice arrays, the first end of each cell slice is a cutting end face, and the second end is a non-cutting end face; wherein, the cell slices are The cutting end face includes a laser scribing part close to the front of the cell and a mechanical breaking part close to the back of the cell; a plurality of cell slices form a cell slice group as the positive output and a slice group as the negative output; each cell slice Each group includes n cell slices connected in sequence by welding ribbons;
  • the second part is placed on the front side of the cell near the cut end face of the i+1th cell slice, and the middle part is placed on the ith cell slice and the i+1th cell slice. between slices; when the heterojunction cell module is laminated, the mechanically broken part of the i+1th cell slice is set on the side away from the welding tape;
  • the heterojunction battery assembly includes a bus bar;
  • the battery slice group as the positive output includes two, which are respectively denoted as the first battery slice group and the second battery slice group;
  • the first battery slice group and the The second cell slice group is symmetrically arranged with the bus bar, and the non-cut end faces of each cell slice in the first cell slice group and the second cell slice group face the bus bar;
  • the third cell slice group and the fourth cell slice group are symmetrically arranged by the bus bar, and The cut end faces of each cell slice in the third cell slice group and the fourth cell slice group face the bus bar.
  • first cell slice group and the third cell slice group are arranged on one side of the bus bar, and 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 arranged alternately in rows or columns along the direction of the bus bar.
  • a preset gap is set between the adjacent battery slices in each battery slice group, and the middle part of each welding ribbon is set in the preset gap between the corresponding adjacent battery slices, and When the heterojunction cell assembly is laminated, the mechanically broken portion of each cell slice is positioned over the middle portion of the corresponding ribbon.
  • a preparation method of a heterojunction battery assembly comprising:
  • Cutting process Half-cutting the printed heterojunction cell from the front of the cell to form cell slices; one end of each cell slice is a cutting end face, and one end is a non-cutting end face;
  • the cutting end face includes a laser scribing part close to the front side of the battery slice and a mechanical breaking part close to the back side of the battery slice;
  • Typesetting process Typesetting a plurality of cell slices according to the typesetting method of a plurality of cell slices in a heterojunction cell assembly as one of the purposes of the present application to form a heterojunction cell assembly;
  • Lamination process Laminate processing of heterojunction cell components.
  • each cell slice after being cut is transported in sequence, and the orientation of the cut end face and the non-cut end face of each cell slice is adjusted during the transportation process, so that When each cell slice in the cell slice group that is output as the positive electrode arrives at the typesetting device for typesetting, the mechanically broken part of each cell slice does not come into contact with the ribbon.
  • adjusting the orientation of the cut end face and the non-cut end face of each cell slice during transportation includes rotating the corresponding cell slice by 180° in the horizontal direction or 180° in the vertical direction.
  • the lamination process includes: disposing corresponding encapsulation layers on the front side of the cell sheet and the back side of the cell sheet, and then laminating the encapsulation layer, the cell slice slices and the solder tape through a lamination process.
  • the welding tape does not contact the mechanical breaking part, and the welding tape will not press the mechanical breaking part during lamination.
  • the pressure greatly reduces the probability of cracking of the battery sheet and improves the strength of the battery sheet.
  • the preparation method provided by the present application has simple production process and high yield, which is beneficial to industrialized production.
  • FIG. 1 is a schematic structural diagram of a cell slice of a conventional battery after being sliced.
  • FIG. 2 is a schematic structural diagram of a cell slice of a heterojunction battery after the cell slice is sliced.
  • FIG. 3 is a schematic diagram of a laminated structure of cell slices, welding tapes and encapsulation layers of the battery module when preparing the heterojunction battery module by using the existing battery module preparation method.
  • FIG. 4 is a schematic enlarged view of the connection structure of the cell slice and the welding ribbon in FIG. 3 .
  • FIG. 5 is a schematic diagram of the connection between adjacent cell slices and welding ribbons in the heterojunction cell assembly provided by the present application.
  • FIG. 6 is a schematic diagram of the laminated structure of the cell slices, the welding tape and the encapsulation layer of the heterojunction battery assembly during the preparation of the heterojunction battery assembly provided by the present application.
  • FIG. 7 is a schematic enlarged view of the connection structure of the cell slice and the welding ribbon in FIG. 6 .
  • FIG. 8 is a schematic layout diagram of the heterojunction battery assembly provided by the present application.
  • each cell is generally cut in half to form two cell slices, and then the cell slices of multiple cell sheets are connected by welding tape, and the cell slices, welding tape and The encapsulation layer is fixed to form a battery assembly.
  • the front side of the battery sheet is the negative electrode
  • the back side of the battery sheet is the positive electrode of the battery.
  • the dicing process of the battery slice generally adopts the laser scribing method, that is, the laser scribing machine is used to cut the preset depth along the direction perpendicular to the main grid line, and then the battery slice is divided into two batteries by mechanical breaking. slice slices.
  • the battery slice is cut in half to form a battery slice 1', one end of which is the cutting end face 5' (the cutting end face 5' is the end face of the battery slice formed by cutting the battery slice through the dicing process), and the other end is the cutting end face 5'.
  • One end is a non-cutting end face 8' (the non-cutting end face 8' is the end face of the battery sheet that has not been cut by the dicing process). Due to the difference between laser cutting and mechanical breaking, the cutting end face 5' of the formed cell slice 1' includes two parts: a laser scribing part 51' and a mechanical breaking part 52'.
  • the laser scribing part 51 refers to the part cut by the laser cutting machine, and its surface is smooth and flat; and the mechanical breaking part 52' refers to the part that is broken by mechanical breaking, and its surface is uneven due to stress.
  • the cell is usually cut from the back 6' of the cell, especially for PERC (Passivated Emitter and Rear Cell) cells to say. Therefore, for the battery slice 1' formed by cutting the conventional battery slices in half, the laser scribing part 51' in the cutting end face 5' of the battery slice 1' is the part close to the back 6' of the battery slice.
  • the broken part 52' is the part close to the front side 7' of the battery sheet.
  • the cutting end face 5 of the cell slice 1 of the heterojunction cell is different from the cutting end face 5 of the conventional cell slice 1, that is, the laser scribing part 51 is the part close to the front side 7 of the cell, The mechanically broken part 52 is the part close to the back surface 6 of the battery sheet.
  • the present application provides a new cell assembly for a heterojunction cell, in which, by adjusting the arrangement of cell slices, the probability of damage to the ribbon can be effectively reduced, the probability of cell cracking can be reduced, and the Product yield.
  • the present application provides a heterojunction cell assembly including a cell slice array of a plurality of heterojunction cells.
  • Each cell slice group includes a plurality of cell slices sequentially connected by welding ribbons. That is, two adjacent cell slices in each cell slice group are electrically connected by a welding ribbon.
  • each cell slice 1 includes a cut end face 5 and a non-cut end face 8 .
  • the cutting end face 5 includes a laser scribing part 51 close to the front side 7 of the cell sheet and a mechanically breaking part 52 close to the back side 6 of the cell sheet.
  • each cell slice group includes n cell slices that are sequentially connected by welding ribbons. Among them, n ⁇ 2, n is a natural number.
  • the number of battery slices in the battery slice group output as positive is the same as the number of battery slices in the battery slice group output as negative, and the battery slice group output as positive is the same as the negative output.
  • the output cell slice groups are alternately set in sequence, such as alternate row setting or alternate column setting.
  • the cell slice group includes n cell slices sequentially connected by welding ribbons, each cell slice is marked as the i-th cell slice, and i is a natural number greater than or equal to 1.
  • the i-th cell slice and the i+1-th cell slice are electrically connected by a welding tape, and the first part of the welding tape is placed on the back of the cell near the non-cut end face of the i-th cell slice , the second part is placed on the front side of the cell near the cutting end face of the i+1th cell slice, and the middle part is placed between the ith cell slice and the i+1th cell slice; in the heterojunction When the battery module is laminated, the mechanically broken part of the i+1 th battery slice is set on the side away from the welding tape.
  • FIG. 5 a schematic diagram of the positional relationship between two adjacent cell slices and the welding ribbon is given in this embodiment: two adjacent cell slices are respectively denoted as the first cell slice 11 , the first cell slice Two cell slices 12, the first part 21 of the welding tape is placed on the back of the cell near the non-cut end face of the first cell slice 11, and the second part 22 is placed on the cell close to the cut end face of the second cell slice 12.
  • the middle portion 22 is provided between the first cell slice 11 and the second cell slice 12 .
  • the mechanically broken portion 52 of the cut end face of the second cell slice 12 is provided on the side away from the welding tape and is not in contact with the welding tape. That is, the mechanically broken portion of the cut end face of each cell slice in the cell slice group serving as the positive output is provided on the side away from the corresponding welding strip, and is not in contact with the welding strip.
  • FIG. 6-7 a schematic diagram of the lamination of the battery module is given in this embodiment.
  • the front encapsulation layer 4 is arranged on the front of the battery, and the back encapsulation layer 3 is arranged on the back of the battery, and then the back of the battery is facing the back of the laminator.
  • the mechanically broken portion 52 of the cut end face of each battery slice 1 is on the side away from the welding tape 2 and is not in contact with the welding tape 2 . Therefore, the welding tape 2 does not form a pressing force on the mechanically broken part 52, which reduces the probability of cracking of the battery sheet after lamination, and improves the yield of the product.
  • FIG. 3-4 it is a schematic diagram of the structure of the heterojunction battery module laminated according to the existing layout method of cell slices, with a front encapsulation layer 4 on the front of the cell, and a back encapsulation layer 3 on the back of the cell. Then, when the battery module is laminated from the back of the battery slice to the laminator, since the mechanically broken part 52 of the cut end face of each battery slice 1 is in contact with the welding tape, the welding tape is easy to be mechanically broken. The open portion 52 forms a pressing force.
  • the orientation of the cut end face and the non-cut end face of each cell slice group in the cell slice group as the positive output is adjusted, so that when two adjacent cell slices are connected by welding ribbons, the It is sufficient that the mechanically broken part of the cut end face does not come into contact with the welding tape. That is, the orientation of the cut end face and the non-cut end face of each cell slice is adjusted in the layout method of the cell slices in the existing battery assembly of the present application, without any need for the structure of the cell slice itself. Changes and any changes in the structure of the welding tape can reduce the probability of cracking of the cell after lamination and improve the yield of the product.
  • the cell slice group also includes n cell slices connected in sequence by welding ribbons, each cell slice is recorded as the jth cell slice, and j is a natural number greater than or equal to 1.
  • the jth cell slice and the j+1th cell slice are electrically connected by a welding tape, and the first part of the welding tape is stacked on the front side of the cell near the cut end face of the jth cell slice , the second part is stacked on the back of the cell near the non-cut end face of the j+1th cell slice, and the middle part is arranged between the jth cell slice and the j+1th cell slice;
  • the mechanically broken part of the jth cell slice is provided on the side away from the welding tape.
  • any two adjacent cell slices in the group of cell slices that are output as negative electrodes are respectively: the third cell slice 13 , the fourth cell slice 14 , and the first part 21 of the welding ribbon. Placed on the front side of the cell near the cut end face of the third cell slice 13, the second part 22 is placed on the back of the cell near the non-cut end face of the fourth cell slice 14, and the middle part 22 is provided on the third cell slice Between the slice 13 and the fourth cell slice 14 .
  • the mechanically broken portion 52 of the cut end face of the third cell slice 13 is provided on the side away from the welding tape and is not in contact with the welding tape. That is, the mechanically broken part of the cut end face of each cell slice in the cell slice group that is output as the negative electrode is provided on the side away from the corresponding welding strip, and is not in contact with the welding strip.
  • the welding tape will not form a pressing force on the mechanically broken part of the cut end face of each cell slice, which reduces the probability of cracking of the cell slice and improves the yield of the product.
  • the heterojunction cell assembly further includes bus bars.
  • bus bars There are two cell slice groups as positive output, which are respectively denoted as: the first cell slice group and the second cell slice group, and the first cell slice group and the second cell slice group are symmetrically arranged by bus bars, and are electrically connected through bus bars.
  • there are two cell slice groups that are output as negative electrodes which are respectively denoted as: the third cell slice group and the fourth cell slice group, and the third cell slice group and the fourth cell slice group are connected by bus bars. Symmetrically arranged and electrically connected through bus bars.
  • the first cell slice group, the second cell slice group, the third cell slice group, and the fourth cell slice group all include n cell slices connected in sequence by welding ribbons, that is, the first cell slice group Any two adjacent cell slices in the cell slice group, the second cell slice group, the third cell slice group, and the fourth cell slice group are connected by welding ribbons, and each cell slice
  • the mechanically broken parts of the cutting end face are set on the side away from the corresponding welding strip, and do not contact the welding strip.
  • the first cell slice group and the second cell slice group output as the positive electrode are electrically connected through the bus bar 9
  • the third cell slice group and the fourth cell slice group output as the negative electrode are electrically connected
  • the groups are electrically connected through bus bars 9 .
  • the non-cut end faces of each cell slice in the first cell slice group and the second cell slice group face the bus bar 9; each cell in the third cell slice group and the fourth cell slice group
  • the cut end faces of the chip slices all face the bus bar 9 .
  • FIG. 8 a schematic layout diagram of a plurality of cell slices 1 of a heterojunction cell assembly given in this embodiment, the chamfered end of each cell slice 1 is a cut end face without chamfering One end is the non-cut end face.
  • the identification A column of cell slices is the group of cell slices that are output as positive electrodes, marked with It is the cell slice group that is output as the negative electrode.
  • the non-cutting end face of each cell slice 1 in the first cell slice group and the second cell slice group output as the positive electrode is all facing the bus bar 9, and the cutting end face is opposite to the non-cutting end face;
  • the third cell slice group, the cut end face of each cell slice 1 in the third cell sheet slice group faces the bus bar 9, and the non-cut end face is opposite to the cut end face.
  • the first cell slice group and the second cell slice group are symmetrically arranged by bus bars 9
  • the third cell slice group and the fourth cell slice group are symmetrically arranged by bus bars 9
  • the first cell slice group and the third cell slice group are alternately arranged on one side of the bus bar 9
  • the second cell slice group and the fourth cell slice group are alternately arranged on the other side of the bus bar 9 .
  • the present application improves the layout of a plurality of cell slices in the existing battery assembly, so that the mechanically broken part of the cut end face of each cell slice is located on the side away from the welding strip, and does not contact the welding strip, so as to avoid During lamination, the welding tape forms a pressing force on the mechanically broken part of the cut end face of each cell slice, which greatly reduces the chance of cracking of the cell.
  • the present application also provides a method for preparing a heterojunction battery assembly, the preparation method comprising:
  • the printed heterojunction cells are cut in half from the front side of the cells to form cell slices.
  • One end of each cell slice is a cut end face, and the other end is a non-cut end face.
  • the cutting end face includes a laser scribing part close to the front side of the cell sheet and a mechanical breaking part close to the back side of the cell sheet.
  • Typesetting process Typesetting of multiple cell slices to form a heterojunction cell assembly.
  • the layout is performed according to the layout method of the plurality of battery slices in the heterojunction battery assembly provided in the first embodiment when the layout of the plurality of battery slices is performed, so that the mechanical breaking of the cutting end face of each battery slice is made.
  • the part is located on the side away from the welding strip and does not contact the welding strip.
  • Lamination process Laminate processing of heterojunction cell components.
  • the typesetting is performed by sequentially transporting each cell slice to the corresponding typesetting equipment. Therefore, during the conveying process, the orientation of the cell slices can be adjusted so that after each cell slice reaches the typesetting equipment, the mechanically broken part of the cut end face does not come into contact with the corresponding welding tape.
  • the rotation includes a 180° rotation in the horizontal direction and a 180° rotation in the vertical direction.
  • each cell slice after being cut is transported in sequence, and the orientation of the cut end face and the non-cut end face of each cell slice is adjusted during transportation.
  • the lamination process further includes: disposing corresponding encapsulation layers on the front side of the cell sheet and the back side of the cell sheet, and then laminating the encapsulation layer, the cell sheet slices and the solder tape through a lamination process.

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Abstract

一种异质结电池组件及其制备方法，所述异质结电池组件包括多个电池片切片(1)阵列，每个电池片切片(1)的第一端为切割端面(5)、第二端为非切割端面(8)；其中，电池片切片(1)的切割端面包括靠近电池片正面的激光划片部分(51)和靠近电池片背面的机械掰开部分(52)；每个电池片切片组均包括n个通过焊带(2)连接的电池片切片(1)；多个电池片切片(1)形成作为正极输出的电池片切片组和作为负极输出的切片组；电池片切片的机械掰开部分(52)远离焊带(2)。

Description

一种异质结电池组件及其制备方法
相关申请
本申请要求2020年9月28日申请的，申请号为202011040756.0，发明名称为“一种异质结电池组件及其制备方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池组件制备领域，尤其涉及一种异质结电池组件及其制备方法。
背景技术
在电池组件生产过程中，为了降低成本、使产品更加轻薄，电池组件中的电池片的厚度越来越小，导致电池片防止机械破坏的能力下降，进而加大了电池片的隐裂风险。电池片产生的电流需要依靠电池片表面的主栅线以及垂直于主栅线的细栅线的收集以及导出。但是，当电池片隐裂时，细栅线断裂，电流无法通过细栅线输送到主栅线，最终导致电池片部分甚至全部无法工作。
基于此，亟待提供一种新的电池片排布方式，以解决现有技术中电池片隐裂的问题。
发明内容
为了克服现有技术的不足，本申请的目的之一在于提供一种异质结电池组件，其能够解决现有技术中异质结电池组件在层压后存在隐裂的风险等问题。
本申请的目的之二在于提供一种异质结电池组件的制备方法，其能够解决现有异质结电池组件在层压后存在隐裂的风险等问题。
本申请的目的之一采用如下技术方案实现：
一种异质结电池组件，所述异质结电池组件包括多个电池片切片阵列，每个电池片切片的第一端为切割端面、第二端为非切割端面；其中，电池片切片的切割端面包括靠近电池片正面的激光划片部分和靠近电池片背面的机械掰开部分；多个电池片切片形成作为正极输出的电池片切片组和作为负极输出的切片组；每个电池片切片组均包括n个通过焊带依次顺序连接的电池片切片；
其中，作为正极输出的电池片切片组：第i个电池片切片与第i+1个电池片切片之间通过焊带电性连接，并且焊带的第一部分放置于靠近第i个电池片切片的非切割端面的电池片背面上、第二部分放置于靠近第i+1个电池片切片的切割端面的电池片正面上、中间部分设于第i个电池片切片与第i+1个电池片切片之间；在异质结电池组件层压时，第i+1 个电池片切片的机械掰开部分设于远离所述焊带的一面；
作为负极输出的电池片切片组：第j个电池片切片与第j+1个电池片切片之间通过焊带电性连接，并且焊带的第一部分放置于靠近第j个电池片切片的切割端面的电池片正面上、第二部分叠设于靠近第j+1个电池片切片的非切割端面的电池片背面上、中间部分设于第j个电池片切片与第j+1个电池片切片之间；在异质结电池组件层压时，第j个电池片切片的机械掰开部分设于远离所述焊带的一面；i和j为大于或等于1的自然数。
进一步地，所述异质结电池组件包括汇流条；作为正极输出的电池片切片组包括两个，分别记为第一电池片切片组和第二电池片切片组；第一电池片切片组与第二电池片切片组以所述汇流条对称设置，并且第一电池片切片组以及第二电池片切片组中的每个电池片切片的非切割端面均朝向所述汇流条；
作为负极输出的电池片切片组包括两个，分别记为第三电池片切片组和第四电池片切片组，第三电池片切片与第四电池片切片组以所述汇流条对称设置，并且第三电池片切片组以及第四电池片切片组中的每个电池片切片的切割端面均朝向所述汇流条。
进一步地，第一电池片切片组与第三电池片切片组设于所述汇流条的一侧，第二电池片切片组与第四电池片切片组设于所述汇流条的另一侧，并且所述第一电池片切片组与第三电池片切片组沿着所述汇流条的方向依次交替行或列设置。
进一步地，所述每个电池片切片组中的相邻电池片切片之间设有预设间隙，每个焊带的中间部分设于对应相邻电池片切片之间的预设间隙内，并且当异质结电池组件层压时，每个电池片切片的机械掰开部分均位于对应焊带的中间部分的上方。
本申请的目的之二采用如下技术方案实现：
一种异质结电池组件的制备方法，所述制备方法包括：
切割流程：对印刷完成的异质结电池片从所述异质结电池片的电池片正面进行半片切割形成电池片切片；每个电池片切片的一端为切割端面、一端为非切割端面；所述切割端面包括靠近电池片正面的激光划片部分和靠近电池片背面的机械掰开部分；
排版流程：将多个电池片切片根据如本申请目的之一采用的一种异质结电池组件中的多个电池片切片的排版方式进行排版形成异质结电池组件；
层压流程：对异质结电池组件层压处理。
进一步地，所述排版流程前包括上料流程：对切割后的每个电池片切片进行依次运输，并在运输过程中对每个电池片切片的切割端面以及非切割端面的朝向进行调整，使得作为正极输出的电池片切片组中的每个电池片切片到达排版设备排版时每个电池片切片的机械掰开部分不与焊带接触。
进一步地，所述在运输过程中对每个电池片切片的切割端面以及非切割端面的朝向进行调整时包括将对应电池片切片在水平方向上旋转180°或在垂直方向上旋转180°。
进一步地，所述层压流程包括：在电池片正面以及电池片背面设置对应封装层，然后通过层压工艺对封装层、电池片切片以及焊带进行层压处理。
相比现有技术，本申请的有益效果在于：
在本申请提供的电池组件中，通过将机械掰开部设置在远离焊带的一侧，使得焊带与机械掰开部分不接触，在层压时焊带不会对机械掰开部分形成挤压力，大大降低了电池片出现隐裂的几率，提高了电池片的强度。同时，本申请提供的制备方法生产工艺简单、良品率高，有利于工业化生产。
附图说明
图1为常规电池的电池片划片后电池片切片的结构示意图。
图2为异质结电池的电池片划片后电池片切片的结构示意图。
图3为采用现有的电池组件制备方法在制备异质结电池组件时，电池组件的电池片切片、焊带以及封装层的层压结构示意图。
图4为图3中电池片切片与焊带的连接结构示意放大图。
图5为本申请提供的异质结电池组件中的相邻电池片切片与焊带的连接示意图。
图6为本申请提供的异质结电池组件在制备时，异质结电池组件的电池片切片、焊带以及封装层的层压结构示意图。
图7为图6中电池片切片与焊带的连接结构示意放大图。
图8为本申请提供的异质结电池组件的排版示意图。
图中：1’、电池片切片；2’、焊带；3’、背面封装层；4’、正面封装层；5’、切割端面；51’、激光划片部分；52’、机械掰开部分；6’、电池片背面；7’、电池片正面；8’、非切割端面；1、电池片切片；2、焊带；3、背面封装层；4、正面封装层；5、切割端面；51、激光划片部分；52、机械掰开部分；6、电池片背面；7、电池片正面；8、非切割端面；9、汇流条；11、第一电池片切片；12、第二电池片切片；13、第三电池片切片；14、第四电池片切片；21、第一部分；22、第二部分；23、中间部分。
具体实施方式
下面，结合附图以及具体实施方式，对本申请做进一步描述，需要说明的是，在不相冲突的前提下，以下描述的各实施例之间或各技术特征之间可以任意组合形成新的实施例。
电池片生产过程中，一般将每个电池片进行半片切割形成两个电池片切片，然后将多个电池片的电池片切片通过焊带连接，并通过层压工艺将电池片切片、焊带以及封装层固定形成电池组件。一般地，电池片的正面为负极，电池片的背面是电池的正极。其中，电池片的划片工艺一般采用激光划片法，也即：采用激光划片机沿垂直主栅线的方向进行激光切割预设深度，然后以机械掰片方式将电池片分成两个电池片切片。
如图1所示，将电池片进行半片切割形成电池片切片1’，其一端为切割端面5’(切割端面5’为通过划片工艺切割电池片后所形成的电池片的端面)、另一端为非切割端面8’(非切割端面8’为未通过划片工艺切割的电池片的端面)。由于激光切割与机械掰片的不同，会使得形成的电池片切片1’的切割端面5’包括两部分：激光划片部分51’和机械掰开部分52’。其中，激光划片部分51指通过激光切割机切割的部分，其表面光滑平整；而机械掰开部分52’指机械掰片方式掰开的部分，由于应力的原因，其表面凹凸不平。一般来说，常规的电池片在半片切割时，通常从电池片的电池片背面6’对电池片进行切割，尤其是对PERC(Passivated Emitter and Rear Cell，钝化发射极和背面电池)电池片来说。因此，对于常规的电池片半片切割后所形成的电池片切片1’来说，电池片切片1’的切割端面5’中的激光划片部分51’为靠近电池片背面6’的部分，机械掰开部分52’为靠近电池片正面7’的部分。
然而，对于异质结电池来说，由于异质结电池的电池片的结构特性，在对异质结电池的电池片进行半片切割时，需要从电池片正面进行激光划片预设深度，然后再经过机械掰片方式将电池片分成两个电池片切片。如图2所示，异质结电池片的电池片切片1的切割端面5与常规的电池片切片1的切割端面5不同，也即：激光划片部分51为靠近电池片正面7的部分，而机械掰开部分52为靠近电池片背面6的部分。
如图3和图4所示，当异质结电池的电池片切片1采用现有的电池制备方法中对电池组件进行层压，由于每个电池片切片1的切割端面5中的激光划片部分51、机械掰开部分52的分布位置与常规的电池片切片1的切割端面5中的激光划片部分51、机械掰开部分52的分布位置正好相反。电池组件在层压时，电池片切片1的切割断面5的机械掰开部分52与焊带2接触，凹凸不平的机械掰开部分52容易损坏焊带2，进而增大层压后电池片出现隐裂的几率以及电池片上的细栅线断裂的可能，导致电池片部分或全部失效。
基于此，本申请提供了一种新的异质结电池的电池片组件，其中，通过调整电池片切片的排布方式，可以有效减少焊带损坏的概率，降低电池片隐裂的几率，提高产品的良品率。
如图5所示，本申请提供了一种异质结电池组件，包括多个异质结电池的电池片切片 阵列。每个电池片切片组均包括多个通过焊带依次顺序连接的电池片切片。也即，每个电池片切片组中相邻两个电池片切片之间通过一根焊带电性连接。
其中，电池片切片是由异质结电池片通过切割工艺切割而成的。通过将一个异质结电池片切割后形成两个电池片切片。如图2所示，每个电池片切片1均包括切割端面5和非切割端面8。切割端面5包括靠近电池片正面7的激光划片部分51和靠近电池片背面6的机械掰开部分52。
为了便于说明本申请中电池片切片与焊带之间的连接结构，以说明本申请如何通过对电池片切片的切割端面的朝向进行调整，使得焊带与电池片切片的切割端面的机械掰开部分不接触，本实施例设定每个电池片切片组均包括n个通过焊带顺次连接的电池片切片。其中，n≥2，n为自然数。
可选地，作为正极输出的电池片切片组中的电池片切片的数量与作为负极输出的电池片切片组中的电池片切片的数量均相同，并且作为正极输出的电池片切片组与作为负极输出的电池片切片组依次交替设置，比如交替行设置或交替列设置。
其中，对于作为正极输出的电池片切片组来说：
该电池片切片组包括n个由焊带顺序依次连接的电池片切片，每个电池片切片记为第i个电池片切片，i为大于或等于1的自然数。
具体地：第i个电池片切片与第i+1个电池片切片之间通过焊带电性连接，并且焊带的第一部分放置于靠近第i个电池片切片的非切割端面的电池片背面上、第二部分放置于靠近第i+1个电池片切片的切割端面的电池片正面上、中间部分设于第i个电池片切片与第i+1个电池片切片之间；在异质结电池组件层压时，第i+1个电池片切片的机械掰开部分设于远离焊带的一面。
如图5所示，为本实施例给出的相邻两个电池片切片与焊带之间的位置关系示意图简图：相邻两个电池片切片分别记为第一电池片切片11、第二电池片切片12，焊带的第一部分21放置于靠近第一电池片切片11的非切割端面的电池片背面上、第二部分22放置于靠近第二电池片切片12的切割端面的电池片正面上，中间部分22设于第一电池片切片11与第二电池片切片12之间。从图5中可以看出，第二电池片切片12的切割端面的机械掰开部分52设于远离焊带的一面，不与焊带接触。也即，作为正极输出的电池片切片组中的每个电池片切片的切割端面的机械掰开部分均设于远离对应焊带的一面，不与焊带接触。
如图6-7所示，为本实施例给出电池组件层压示意图，在电池片正面设置正面封装层4、在电池片背面设置背面封装层3，然后将电池片背面朝向层压机后从电池片背面对电池 组件进行层压时，由于每个电池片切片1的切割端面的机械掰开部分52处于远离焊带2的一面，不与焊带2接触。因此，焊带2不会对机械掰开部分52形成挤压力，降低了层压后电池片出现隐裂的几率，提高产品的良率。
如图3-4所示，为异质结电池组件按照现有的电池片切片的排版方式进行层压的结构示意图，在电池片正面设置正面封装层4、在电池片背面设置背面封装层3，然后将电池片背面朝向层压机后从电池片背面对电池组件进行层压时，由于每个电池片切片1的切割端面的机械掰开部分52与焊带接触，焊带易对机械掰开部分52形成挤压力。
很明显，从图6-7以及图3-4进行对比可知，本实施例通过将每个电池片切片1的切割端面与非切割端面的朝向进行调整后，每个电池片切片1的切割端面的机械掰开部分52设于远离焊带2的一面，不与焊带2接触，在层压时，避免焊带2对机械掰开部分52形成挤压力的问题，从而降低了层压后电池片出现隐裂的几率，大大提高产品的良率。
因此，对于作为正极输出的电池片切片组中的每个电池片切片的切割端面与非切割端面的朝向调整，从而使得相邻两个电池片切片通过焊带连接时，每个电池片切片的切割端面的机械掰开部分不与焊带接触即可。也即，本申请在现有的电池组件中电池片切片的排版方式中每个电池片切片的切割端面与非切割端面的朝向进行调整，而不需要针对电池片切片的本身的结构进行任何的改变以及焊带的结构进行任何的改变，即可降低层压后电池片出现隐裂的几率，提高产品的良率。
同理，对于作为负极输出的电池片切片组来说：
电池片切片组也包括n个由焊带依次顺序连接的电池片切片组成，每个电池片切片记为第j个电池片切片，j为大于或等于1的自然数。
具体地：第j个电池片切片与第j+1个电池片切片之间通过焊带电性连接，并且焊带的第一部分叠设于靠近第j个电池片切片的切割端面的电池片正面上、第二部分叠设于靠近第j+1个电池片切片的非切割端面的电池片背面上、中间部分设于第j个电池片切片与第j+1个电池片切片之间；在异质结电池组件层压时，第j个电池片切片的机械掰开部分设于远离焊带的一面。
同理，如图5所示，作为负极输出的电池片切片组中的任意的相邻两个电池片切片分别：第三电池片切片13、第四电池片切片14，焊带的第一部分21放置于靠近第三电池片切片13的切割端面的电池片正面上、第二部分22放置于靠近第四电池片切片14的非切割端面的电池片背面上，中间部分22设于第三电池片切片13与第四电池片切片14之间。
从图5中可以看出，第三电池片切片13的切割端面的机械掰开部分52设于远离焊带的一面，不与焊带接触。也即，作为负极输出的电池片切片组中的每个电池片切片的切割 端面的机械掰开部分均设于远离对应焊带的一面，不与焊带接触。
同理，在层压时，焊带不会对每个电池片切片的切割端面的机械掰开部分形成挤压力，降低了电池片出现隐裂的几率，提高了产品的良率。
可选地，异质结电池组件还包括汇流条。作为正极输出的电池片切片组包括两个，分别记为：第一电池片切片组、第二电池片切片组，并且第一电池片切片组与第二电池片切片组以汇流条对称设置，并通过汇流条电性连接。同理，作为负极输出的电池片切片组包括两个，分别记为：第三电池片切片组和第四电池片切片组，并且第三电池片切片组与第四电池片切片组以汇流条对称设置，并通过汇流条电性连接。
其中，第一电池片切片组、第二电池片切片组、第三电池片切片组、第四电池片切片组均包括n个由焊带依次顺序连接的电池片切片组成，也即，第一电池片切片组、第二电池片切片组、第三电池片切片组、第四电池片切片组中的任意两个相邻的电池片切片之间均通过焊带连接，并且每个电池片切片的切割端面的机械掰开部分均设于远离对应焊带的一面，不与焊带接触。
具体地，如图5所示，作为正极输出的第一电池片切片组与第二电池片切片组通过汇流条9电性连接，作为负极输出的第三电池片切片组与第四电池片切片组通过汇流条9电性连接。同时，第一电池片切片组以及第二电池片切片组中的每个电池片切片的非切割端面均朝向汇流条9；第三电池片切片组以及第四电池片切片组中的每个电池片切片的切割端面均朝向汇流条9。
如图8所示，为本实施例给出的异质结电池组件的多个电池片切片1的排版示意图，每个电池片切片1中带有倒角的一端为切割端面、不带倒角的一端为非切割端面。其中，标识
Figure PCTCN2021109734-appb-000001
的一列电池片切片为作为正极输出的电池片切片组，标识
Figure PCTCN2021109734-appb-000002
为作为负极输出的电池片切片组。
也即：作为正极输出的第一电池片切片组、第二电池片切片组中的每个电池片切片1的非切割端面均朝向汇流条9、切割端面与非切割端面相反；作为负极输出的第三电池片切片组、第三电池片切片组中的每个电池片切片1的切割端面均朝向汇流条9、非切割端面与切割端面相反。
可选地，第一电池片切片组、第二电池片切片以汇流条9对称设置，第三电池片切片组与第四电池片切片组以汇流条9对称设置。第一电池片切片组、第三电池片切片组交替设于汇流条9的一侧，第二电池片切片组与第四电池片切片组交替设于汇流条9的另一侧。
本申请通过在现有的电池组件中多个电池片切片的排版进行改进，使得每个电池片切 片的切割端面的机械掰开部分设于远离焊带的一面，不与焊带接触，避免在层压时，焊带对每个电池片切片的切割端面的机械掰开部分形成挤压力，大大降低了电池片出现隐裂的几率。
本申请还提供了一种异质结电池组件的制备方法，该制备方法包括：
切割流程：对印刷完成的异质结电池片从异质结电池片的电池片正面进行半片切割以形成电池片切片。每个电池片切片的一端为切割端面、另一端为非切割端面。并且，切割端面包括靠近电池片正面的激光划片部分和靠近电池片背面的机械掰开部分。
排版流程：将多个电池片切片进行排版形成异质结电池组件。其中，在对多个电池片切片进行排版时根据实施例一提供的异质结电池组件中多个电池片切片的排版方式进行排版，这样，使得每个电池片切片的切割端面的机械掰开部分设于远离焊带的一面，不与焊带接触。
层压流程：对异质结电池组件层压处理。
在实际生产过程中，一般来说，对电池片切片进行排版时，通过依次将每个电池片切片输送到对应的排版设备进行排版。因此，在输送的过程中，调整电池片切片的朝向，可以使每个电池片切片到达排版设备后，切割端面的机械掰开部分不与对应焊带接触。
可选地，根据焊带焊接的方向不同，在对电池片切片的朝向进行调整时，还分为以下两种情况：
当电池片正面朝上焊接焊带时，将输送过程中的电池片切片进行水平方向旋转；当电池片背面朝向焊带焊带时，将输送过程中的电池片切片进行垂直方向上旋转。可选地，旋转包括在水平方向旋转180°以及在垂直方向上旋转180°。
可选地，在排版流程前还包括上料流程：对切割后的每个电池片切片进行依次运输，并在运输过程中对每个电池片切片的切割端面以及非切割端面的朝向进行调整。
可选地，层压流程还包括：在电池片正面以及电池片背面设置对应封装层，然后通过层压工艺对封装层、电池片切片以及焊带进行层压处理。
上述实施方式仅为本申请的优选实施方式，不能以此来限定本申请保护的范围，本领域的技术人员在本申请的基础上所做的任何非实质性的变化及替换均属于本申请所要求保护的范围。

Claims (8)

  1. 一种异质结电池组件，所述异质结电池组件包括多个电池片切片阵列，每个电池片切片的第一端为切割端面、第二端为非切割端面；其中，电池片切片的切割端面包括靠近电池片正面的激光划片部分和靠近电池片背面的机械掰开部分；其特征在于，多个电池片切片形成作为正极输出的电池片切片组和作为负极输出的切片组；每个电池片切片组均包括n个通过焊带依次顺序连接的电池片切片；
    其中，作为正极输出的电池片切片组：第i个电池片切片与第i+1个电池片切片之间通过焊带电性连接，并且焊带的第一部分放置于靠近第i个电池片切片的非切割端面的电池片背面上、第二部分放置于靠近第i+1个电池片切片的切割端面的电池片正面上、中间部分设于第i个电池片切片与第i+1个电池片切片之间；在异质结电池组件层压时，第i+1个电池片切片的机械掰开部分设于远离所述焊带的一面；
    作为负极输出的电池片切片组：第j个电池片切片与第j+1个电池片切片之间通过焊带电性连接，并且焊带的第一部分放置于靠近第j个电池片切片的切割端面的电池片正面上、第二部分叠设于靠近第j+1个电池片切片的非切割端面的电池片背面上、中间部分设于第j个电池片切片与第j+1个电池片切片之间；在异质结电池组件层压时，第j个电池片切片的机械掰开部分设于远离所述焊带的一面；i，j为大于或等于1的自然数。
  2. 根据权利要求1所述一种异质结电池组件，其特征在于，所述异质结电池组件包括汇流条；作为正极输出的电池片切片组包括两个，分别记为第一电池片切片组和第二电池片切片组；第一电池片切片组与第二电池片切片组以所述汇流条对称设置，并且第一电池片切片组以及第二电池片切片组中的每个电池片切片的非切割端面均朝向所述汇流条；
    作为负极输出的电池片切片组包括两个，分别记为第三电池片切片组和第四电池片切片组，第三电池片切片与第四电池片切片组以所述汇流条对称设置，并且第三电池片切片组以及第四电池片切片组中的每个电池片切片的切割端面均朝向所述汇流条。
  3. 根据权利要求2所述的一种异质结电池组件，其特征在于，第一电池片切片组与第三电池片切片组设于所述汇流条的一侧，第二电池片切片组与第四电池片切片组设于所述汇流条的另一侧，并且所述第一电池片切片组与第三电池片切片组沿着所述汇流条的方向依次交替行或列设置。
  4. 根据权利要求1所述的一种异质结电池组件，其特征在于，所述每个电池片切片组中的相邻电池片切片之间设有预设间隙，每个焊带的中间部分设于对应相邻电池片切片之间的预设间隙内，并且当异质结电池组件层压时，每个电池片切片的机械掰开部分均位于 对应焊带的中间部分的上方。
  5. 一种异质结电池组件的制备方法，其特征在于，所述制备方法包括：
    切割流程：对印刷完成的异质结电池片从所述异质结电池片的电池片正面进行半片切割形成电池片切片；每个电池片切片的一端为切割端面、一端为非切割端面；所述切割端面包括靠近电池片正面的激光划片部分和靠近电池片背面的机械掰开部分；
    排版流程：将多个电池片切片根据如权利要求1-4中任一项所述的一种异质结电池组件中的多个电池片切片的排版方式进行排版形成异质结电池组件；
    层压流程：对异质结电池组件层压处理。
  6. 根据权利要求5所述的异质结电池组件的制备方法，其特征在于，所述排版流程前包括上料流程：对切割后的每个电池片切片进行依次运输，并在运输过程中对每个电池片切片的切割端面以及非切割端面的朝向进行调整，使得作为正极输出的电池片切片组中的每个电池片切片到达排版设备排版时每个电池片切片的机械掰开部分不与焊带接触。
  7. 根据权利要求6所述的异质结电池组件的制备方法，其特征在于，所述在运输过程中对每个电池片切片的切割端面以及非切割端面的朝向进行调整时包括将对应电池片切片在水平方向上旋转180°或在垂直方向上旋转180°。
  8. 根据权利要求5所述的异质结电池组件的制备方法，其特征在于，所述层压流程包括：在电池片正面以及电池片背面设置对应封装层，然后通过层压工艺对封装层、电池片切片以及焊带进行层压处理。
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