WO2024012161A1 - Unité de module de batterie ibc sans grille principale et son procédé de fabrication, module de batterie et chaîne de modules de batterie - Google Patents

Unité de module de batterie ibc sans grille principale et son procédé de fabrication, module de batterie et chaîne de modules de batterie Download PDF

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Publication number
WO2024012161A1
WO2024012161A1 PCT/CN2023/101117 CN2023101117W WO2024012161A1 WO 2024012161 A1 WO2024012161 A1 WO 2024012161A1 CN 2023101117 W CN2023101117 W CN 2023101117W WO 2024012161 A1 WO2024012161 A1 WO 2024012161A1
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WIPO (PCT)
Prior art keywords
low
battery
temperature welding
welding wire
ibc
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PCT/CN2023/101117
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English (en)
Chinese (zh)
Inventor
雷楠
左燕
郭永刚
孙蛟
周西勇
杨紫琪
王锐
Original Assignee
青海黄河上游水电开发有限责任公司西宁太阳能电力分公司
青海黄河上游水电开发有限责任公司西安太阳能电力分公司
青海黄河上游水电开发有限责任公司
国家电投集团黄河上游水电开发有限责任公司
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Publication of WO2024012161A1 publication Critical patent/WO2024012161A1/fr

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Classifications

    • 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
    • H01L31/02—Details
    • H01L31/0224—Electrodes
    • H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • 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
    • H01L31/0508—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 the interconnection means having a particular shape
    • 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
    • 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
    • H01L31/1804—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof comprising only elements of Group IV of the Periodic Table
    • 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

Definitions

  • the invention belongs to the technical field of solar cell components, and specifically relates to a busbarless IBC battery component unit and its manufacturing method, battery components, and battery strings.
  • the photovoltaic industry is developing rapidly under the energy crisis.
  • the key to further promoting photovoltaic applications is to reduce the production cost of solar cell modules and improve the efficiency of solar cell modules.
  • the positive and negative electrodes of IBC (Interdigitated back contact) solar cells are designed on the backlight surface of the battery, and there is no grid line obstruction on the front side, thus avoiding the obstruction of the front grid electrode of conventional cells.
  • the optical loss caused increases the short-circuit current and conversion efficiency of the battery.
  • the electrodes of traditional IBC solar cells are mainly composed of main grid lines and auxiliary grid lines.
  • the auxiliary grid lines are used to collect current, and the main grid lines are used to collect the current collected by the auxiliary grid lines and export the current by welding with welding ribbons.
  • main grid electrodes and auxiliary grid electrodes are generally made of screen-printed conductive silver paste, which requires a large amount of silver paste, resulting in high cost of IBC solar cells.
  • busbar-less cell technology emerged as the times require.
  • Cells without main grid lines generally refer to the conventional cells with the main grid lines removed and thin grid lines retained; this type of cell does not need to have main grid lines, so it can reduce the amount of silver paste. usage and reduce the production cost of the battery. Therefore, applying the busbar-less cell technology to the IBC battery to form a busbar-less IBC battery has become a feasible option to effectively reduce the production cost of the IBC battery.
  • the PN junction and metal contact area are on the back of the battery.
  • IBC cells with both positive and negative electrodes on the back of the battery
  • the PN junction and metal contact area are on the back of the battery.
  • they need to be done on the back of the battery, so It is easy to cause uneven stress on the front and back of the battery.
  • traditional infrared welding technology is used to weld interconnections between IBC cells, due to the high temperature during the welding process, the welded cells are prone to cell warpage, which affects the yield of the battery module and is not good for the battery.
  • the development of thin slices are used to weld interconnections between IBC cells.
  • the present invention provides a busbarless IBC assembly. Unit components and manufacturing methods thereof, battery components, and battery strings.
  • a busbarless IBC battery module unit is provided, and the busbarless IBC battery module unit includes:
  • the first battery sheet and the second battery sheet are provided with positive electrode fine grid lines and negative electrode fine grid lines on the backs of the first battery sheet and the second battery sheet.
  • the positive electrode fine grid lines and the negative electrode fine grid lines are The lines are parallel to each other in the first direction and arranged alternately;
  • the conductive tape includes a first low-temperature welding wire, a second low-temperature welding wire and a carrier film, the first low-temperature welding wire and the second low-temperature welding wire are formed on the carrier film, the first low-temperature welding wire and the The second low-temperature welding wires are parallel to each other and alternately arranged in the second direction; the first direction is perpendicular to the second direction;
  • the first battery sheet and the second battery sheet are welded to the conductive tape in a laminated manner; wherein one end of the first low-temperature welding wire is vertically welded to the positive electrode thin grid line of the first battery sheet , the other end of the first low-temperature welding wire is vertically welded to the negative electrode thin grid line of the second battery piece; one end of the second low-temperature welding wire is vertically welded to the negative electrode thin grid line of the first battery piece, the The other end of the second low-temperature welding wire is vertically welded to the positive electrode thin grid of the second battery piece.
  • the busbarless IBC battery module unit further includes a first encapsulating adhesive film, and the first encapsulating adhesive film includes a reinforcing layer and a laminated The adhesive film layer is on the reinforcement layer, and the first encapsulating adhesive film covers the surface of the conductive tape facing away from the first battery sheet and the second battery sheet.
  • a first cutting point and a second cutting point are further provided on the conductive strip; the first cutting point and the first cutting point are The low-temperature welding wires are spaced apart in the first direction, and the second cutting points and the second low-temperature welding wire are spaced apart in the first direction.
  • the first cutting points and the second cutting points are arranged in an alternately staggered manner in the second direction.
  • contact areas and insulation areas are provided on both the positive and negative thin grid lines of the first battery sheet and the second battery sheet. ; wherein, the contact areas and the insulating areas are linearly arranged and spaced apart in the first direction, and the contact areas and the insulating areas are alternately distributed in the second direction; the contact The insulation area is provided with solder joints, and the insulation area is provided with insulating glue.
  • one end of the first low-temperature welding wire is vertically welded to the contact area of the positive electrode thin grid line of the first battery piece, and the third The other end of a low-temperature welding wire is vertically welded to the contact area of the negative electrode thin grid line of the second battery piece; one end of the second low-temperature welding wire is vertically welded to the contact area of the negative electrode thin grid line of the first battery piece, The other end of the second low-temperature welding wire is vertically welded to the contact area of the positive electrode thin grid of the second battery piece.
  • a busbarless IBC battery module includes a plurality of busbarless IBC battery module units according to any one of claims 1 to 6, and the busbarless IBC battery module
  • the main grid IBC battery module units are connected in series; wherein the first battery sheets and the second battery sheets are alternately arranged in the first direction.
  • a busbarless IBC battery string includes a plurality of busbarless IBC battery module units and a bus as described in any one of claims 1 to 6. belt, the busbarless IBC battery module units are connected in parallel through the bus belt.
  • a method for manufacturing a busbar-less IBC battery module unit includes: forming first and second low-temperature welding wires that are parallel to each other and alternately arranged on the carrier film to Form a conductive tape; arrange the first battery sheet and the second battery sheet on the conductive tape, and perform hot pressing to bond the first battery sheet and the second battery sheet to the conductive tape.
  • the back surfaces of the first battery sheet and the second battery sheet are provided with positive electrode fine grid lines and negative electrode fine grid lines that are parallel to each other in the first direction and alternately arranged; one end of the first low-temperature welding wire is connected to the first battery sheet The positive electrode thin grid line is vertically welded, the other end of the first low-temperature welding wire is vertically welded to the negative electrode thin grid line of the second battery piece; one end of the second low-temperature welding wire is vertically welded to the negative electrode thin grid line of the first battery piece , the other end of the second low-temperature welding wire is vertically welded to the positive electrode thin grid line of the second battery piece.
  • first low-temperature welding wires and second low-temperature welding wires are formed parallel to each other and alternately arranged on the carrier film to
  • the method of forming a conductive tape includes: positioning multiple low-temperature welding wires in parallel at equal intervals through positioning wheels and placing them alternately on the carrier film, and thermally pressing the low-temperature welding wires and the carrier film through a hot-pressing mechanism. So that the low-temperature welding wire and the carrier film are combined into one body; the low-temperature welding wire is cut to form a first cutting point and a second cutting point respectively, thereby forming the first low-temperature welding wire and the second low-temperature welding wire. , obtain the conductive tape;
  • first cutting points and the first low-temperature welding wire are spaced apart in the first direction
  • second cutting points and the second low-temperature welding wire are spaced apart in the first direction
  • first The cutting points and the second cutting points are arranged in an alternately offset manner in the second direction; the first direction is perpendicular to the second direction.
  • the main grid-less IBC battery module unit and its manufacturing method provided by the present invention use low-temperature welding wire on the conductive tape to replace the main grid wire on the back of the IBC battery sheet to achieve interconnection welding and current collection between IBC battery sheets. , which can remove the main grid lines in conventional IBC cells and reduce the usage of silver paste, which will help reduce the production and manufacturing costs of IBC solar cell modules.
  • the current transmission distance can also be shortened, and the series resistance of the cells can be reduced, thereby improving the efficiency of the solar cell module; and the greater the number of low-temperature welding wires, the more It is conducive to improving the tolerance of cell cracks, which is more conducive to improving the performance of solar cell modules.
  • the encapsulating adhesive film covering the conductive tape is an integrated adhesive film composed of a two-layer structure of a reinforcement layer and an adhesive film layer, which can not only provide skeleton support for the conductive tape, but also prevent low-temperature welding wire from being attached to the conductive tape. The occurrence of offset distortion causes a short circuit in the IBC cell sheet, and is conducive to achieving good ohmic contact between the low-temperature welding wire and the positive and negative electrode thin grid lines of the IBC cell sheet.
  • the manufacturing method of the main gridless IBC battery assembly provided by the present invention adopts low-temperature lamination welding to weld and fix the IBC battery sheets and the conductive tape, which is beneficial to alleviate the process of welding and interconnection between the battery sheets. Warping of battery cells caused by high temperature and uneven welding stress will help reduce the fragmentation rate of battery cells, improve component yield, and also facilitate the development of thinner cells.
  • Figure 1 is a schematic structural diagram of a busbarless IBC battery module unit according to an embodiment of the present invention
  • Figure 2 is a schematic structural diagram of a battery sheet of a busbarless IBC battery module unit according to an embodiment of the present invention
  • Figure 3 is a schematic structural diagram of a conductive strip of a busbarless IBC battery module unit according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of an arrangement and installation of busbarless IBC battery module units in a busbarless IBC battery module according to an embodiment of the present invention
  • Figure 5 is a busbarless IBC battery pack in a busbarless IBC battery pack string according to an embodiment of the present invention. Schematic diagram of the arrangement and installation of component units;
  • FIG. 6 is a flow chart of a method of manufacturing a busbarless IBC battery module unit according to an embodiment of the present invention.
  • the term "includes” and variations thereof represent an open term meaning “including, but not limited to.”
  • the terms “based on”, “according to”, etc. mean “based at least in part on”, “based at least in part on”.
  • the terms “one embodiment” and “an embodiment” mean “at least one embodiment.”
  • the term “another embodiment” means “at least one other embodiment”.
  • the terms “first”, “second”, etc. may refer to different or the same object. Other definitions may be included below, whether explicit or implicit. The definition of a term is consistent throughout this specification unless the context clearly dictates otherwise.
  • embodiments of the present invention provide a main grid-less IBC battery component unit and a manufacturing method thereof, a battery component, and a battery string.
  • the main gridless IBC battery module unit includes: a first battery sheet and a second battery sheet; both the first battery sheet and the second battery sheet are provided with positive electrode fine grid lines and negative electrode fine grid lines on their backs, so The positive electrode fine grid lines and the negative electrode fine grid lines are parallel to each other and alternately arranged in the first direction;
  • the conductive tape includes a first low-temperature welding wire, a second low-temperature welding wire and a carrier film, the first low-temperature welding wire and the second low-temperature welding wire are formed on the carrier film, the first low-temperature welding wire and the The second low-temperature welding wires are parallel to each other and alternately arranged in the second direction; the first direction is perpendicular to the second direction;
  • the first battery sheet and the second battery sheet are welded to the conductive tape in a laminated manner; wherein one end of the first low-temperature welding wire is vertically welded to the positive electrode thin grid line of the first battery sheet , the other end of the first low-temperature welding wire is vertically welded to the negative electrode thin grid line of the second battery piece; one end of the second low-temperature welding wire is vertically welded to the negative electrode thin grid line of the first battery piece, the The other end of the second low-temperature welding wire is vertically welded to the positive electrode thin grid of the second battery piece.
  • the main gridless IBC battery module unit also includes a first encapsulation film, a second encapsulation film, a front glass layer and a back plate layer.
  • Figure 1 is a schematic structural diagram of a busbarless IBC battery module unit according to an embodiment of the present invention.
  • a busbarless IBC battery assembly unit includes:
  • the conductive tape 20 is welded to the back side of the battery sheet layer 10 (the battery sheets in the battery sheet layer 10 are all IBC battery sheets, and the back side of the battery sheet layer 10 is where the back side of the IBC battery sheet is located). surface).
  • the first encapsulation film 30 covers the surface of the conductive tape 20 facing away from the battery layer 10 .
  • the second encapsulating film 40 covers the front surface of the battery layer 10 (the back surface and the front surface of the battery layer 10 are opposite to each other).
  • the front glass layer 50 is disposed on the second encapsulating film 40
  • the back plate layer 60 is disposed on the first encapsulating film 30 .
  • Figure 2 is a schematic structural diagram of a battery sheet of a busbarless IBC battery module unit according to an embodiment of the present invention.
  • the battery sheet layer 10 is composed of an arrangement of first battery sheets 11 and second battery sheets 12 . Therefore, the battery sheet in FIG. 2 can be represented as a first battery sheet 11 or a second battery sheet 12 .
  • the back side of the cell is provided with evenly distributed positive electrode fine grid lines 13 and negative electrode fine grid lines 14.
  • the positive electrode fine grid lines 13 and the negative electrode fine grid lines 14 are parallel to each other and alternately arranged in the first direction.
  • the positive electrode thin grid line 13 and the negative electrode thin grid line 14 extend in the second direction (the labels on the positive electrode thin grid line 13 and the negative electrode thin grid line 14 in Figure 2 are not absolute, and their purpose is mainly to Distinguish the positive and negative electrode lines of the cell).
  • the first direction is the arrangement direction of the first battery sheet 11 and the second battery sheet 12, and the The second direction is perpendicular to the first direction.
  • a contact region 15 and an insulation region 16 are provided on both the positive electrode thin gate line 13 and the negative electrode thin gate line 14 .
  • the contact areas 15 and the insulating areas 16 are linearly arranged and spaced apart in the first direction, and the contact areas 15 and the insulating areas 16 are alternately distributed in the second direction. .
  • the contact area 15 is provided with solder paste solder joints, and the insulation area 16 is provided with insulating glue.
  • the height of the solder paste solder joint is 20 ⁇ m to 45 ⁇ m.
  • grid lines 17 perpendicular to the positive electrode thin grid lines 13 and the negative electrode thin grid lines 14 may also be provided at both ends of the edge of the cell sheet.
  • the length of the gate line 17 is ⁇ 10mm, and the width b is ⁇ 0.04mm.
  • the grid lines 17 are conducive to ensuring the current transmission between the positive electrode thin grid lines 13 and the negative electrode thin grid lines 14 at both ends of the cell sheet and the reliability of the cell sheet interconnection.
  • FIG. 3 is a schematic structural diagram of a conductive strip of a busbarless IBC battery module unit according to an embodiment of the present invention.
  • the conductive tape 20 includes a first low-temperature welding wire 21 , a second low-temperature welding wire 22 , a carrier film 23 , a first cutting point 24 and a second cutting point 25 .
  • first low-temperature welding wire 21 and the second low-temperature welding wire 22 are formed on the carrier film.
  • the first low-temperature welding wire 21 and the second low-temperature welding wire 22 both extend along the first direction, and the first low-temperature welding wire 21 and the second low-temperature welding wire 22 are parallel to each other in the second direction. and distributed alternately.
  • the number of the first low-temperature welding wires 21 and the second low-temperature welding wires 22 is equal, and the number of the first low-temperature welding wires 21 or the second low-temperature welding wires 22 is N>9.
  • the distance between the first low-temperature welding wire 21 and the second low-temperature welding wire 22 is equal.
  • the conductive tape 20 is also provided with a first cutting point 24 and a second cutting point 25 .
  • the first cutting points 24 and the first low-temperature welding wire 21 are spaced apart in the first direction, and the second cutting points 25 and the second low-temperature welding wire 22 are spaced apart in the first direction.
  • first cutting points 24 and the second cutting points 25 are arranged in an alternately staggered manner in the second direction.
  • first cutting point 24 and the second cutting point 25 By forming the first cutting point 24 and the second cutting point 25, it is possible to avoid the first battery A short circuit is caused between the chip 11 and the second battery chip 12 .
  • the first low-temperature welding wire 21 and the second low-temperature welding wire 22 both include a base material and a plating layer surrounding the base material.
  • the base material is copper
  • the plating layer is selected from tin-bismuth-silver alloy or tin-bismuth alloy or tin-bismuth-lead alloy with a melting point of ⁇ 140°C.
  • the first low-temperature welding wire 21 and the second low-temperature welding wire 22 have the same cross-sectional shape, which is either circular or rectangular.
  • the diameter of the cross-section is 0.15 mm to 0.35 mm, and the thickness of the coating is 10 ⁇ m to 50 ⁇ m.
  • the widths of the first low-temperature welding wire 21 and the second low-temperature welding wire 22 are 0.2 mm to 1.5 mm. Furthermore, the plating thickness m on the side where the low-temperature welding wire contacts the carrier film 23 ⁇ the plating thickness n on the side where the low-temperature welding wire contacts the battery sheet, where the plating thickness n is 10 ⁇ m to 50 ⁇ m.
  • the material of the carrier film 23 is any one of POE, TPO or EVA.
  • the thickness of the carrier film 23 is 50 ⁇ m to 200 ⁇ m, and the melting point is 90°C to 120°C.
  • the maximum fluidity of the carrier film 23 is lower than that of the first encapsulating adhesive film 30 and the second encapsulating adhesive film 40 .
  • the peeling strength between the carrier film 23 and the battery backside of the battery sheet is ⁇ 30N/cm.
  • one end of the first low-temperature welding wire 21 is vertically welded to the contact area 15 of the positive electrode thin grid line of the first battery piece 11 , and the other end of the first low-temperature welding wire 21 is welded vertically to the second
  • the contact area 15 of the negative electrode fine grid line of the battery sheet 12 is vertically welded;
  • one end of the second low-temperature welding wire 22 is vertically welded to the contact area 15 of the negative electrode fine grid line of the first battery sheet 11, and the second low-temperature welding wire
  • the other end of 22 is vertically welded to the contact area 15 of the positive electrode thin grid line of the second battery piece 12 .
  • the first low-temperature soldering wire 21 and the second low-temperature soldering wire 22 can be connected to the positive and negative electrodes.
  • the negative thin grid lines are connected vertically and avoid direct contact.
  • insulating glue is also provided on the positive and negative thin grid lines of the first battery sheet 11 and the second battery sheet 12 . Since the positive and negative electrode thin grid lines of the first battery sheet 11 and the second battery sheet 12 are alternately distributed along the first direction, the use of the insulating glue can prevent the same low-temperature welding wire from being connected to the same battery. Contact is formed between the thin grid lines of different polarities on the chip, causing a short circuit in the battery.
  • the insulating glue can play an insulating role, multiple groups of adjacent positive and negative electrodes with opposite electrode polarities can be formed in the second direction, where the positive electrodes in each group of positive and negative electrodes can be formed. (or negative electrode) is marked with MARK point M.
  • the main grid-less IBC battery module unit uses low-temperature welding wire on the conductive tape 20 to replace the main grid wires on the back of the IBC battery sheets to achieve interconnection welding and current collection between the battery sheets, thereby eliminating the need for conventional IBC batteries.
  • the main gate lines in the chip can reduce the usage of silver paste by more than 65%.
  • the first encapsulating adhesive film 30 is an integrated adhesive film composed of a two-layer structure of a reinforcement layer 31 and an adhesive film layer 32 .
  • the reinforcing layer 31 is one or a mixture of one or more of glass fiber, carbon fiber or plastic fiber reinforcing materials, and the reinforcing layer 31 has a mesh structure.
  • the thickness of the reinforcement layer 31 is 0.05 mm to 0.20 mm, and the length and width of the reinforcement layer 31 need to be sufficient to completely cover the conductive strip 20 .
  • the material of the adhesive film layer 32 is any one of transparent EVA, POE, or co-extruded POE formed by co-extrusion of EVA and POE.
  • the weight of the adhesive film layer 32 is 460g/m 2 to 550g/m 2 .
  • the reinforcement layer 31 provides a skeleton support function, which can reduce the fluidity of the adhesive film layer 32 during the lamination process of the first encapsulating adhesive film 30 and the conductive tape 20 and prevent The glue film in the glue film layer 32 melts and flows between the conductive tape 20 and the battery piece, causing insulation between the low-temperature welding wire and the positive and negative electrode thin grid lines. Moreover, it can also prevent the low-temperature welding wire from being deflected and twisted due to the high fluidity of the adhesive film layer 32 during the lamination process, thereby causing a short circuit between the low-temperature welding wire and the positive and negative electrode thin grid lines.
  • the reinforcement layer 31 can also simultaneously apply pressure below 20 to the conductive strip 20 to enhance the contact between the low-temperature welding wire and the positive and negative electrode thin grid lines, which is beneficial to achieving good ohmic contact between the low-temperature welding wire and the IBC cell piece. .
  • the material of the second encapsulation film 40 is any one of transparent EVA, POE, or co-extruded POE formed by co-extrusion of EVA and POE.
  • the backsheet layer 60 is any of a white backsheet, a black highly reflective backsheet, a black inside and white outside, a grid backsheet, a transparent glass backsheet, or a grid glass backsheet. A sort of.
  • a busbarless IBC battery assembly is provided, the busbarless The IBC battery module includes a plurality of the above-mentioned busbarless IBC battery module units, and the busbarless IBC battery module units are connected in series.
  • the first battery sheets 11 and the second battery sheets 12 are alternately arranged in the first direction according to the above-mentioned connection method.
  • FIG. 4 is a schematic diagram of an arrangement and installation of busbarless IBC battery module units in a busbarless IBC battery module according to an embodiment of the present invention.
  • the front glass 50 and the front plate glass 50 in the busbarless IBC battery module unit are omitted in FIG. 4
  • the first encapsulating film 30 , the second encapsulating film 40 and the backsheet layer 60 only indicate the battery sheet layer 10 (including the first battery sheet 11 and the second battery sheet 12 ) in the mainbarless IBC battery module unit. ) and conductive tape 20.
  • the conductive tape 20 is connected to the back surface of the first battery sheet 11 and the second battery sheet 12 , and the first battery sheet 11 and the second battery sheet 12 are located there. are alternately arranged in the first direction.
  • the spacing between two adjacent battery sheets can be a positive spacing or a negative spacing according to actual needs.
  • the spacing between two adjacent battery cells when the spacing between two adjacent battery cells is a positive spacing, the spacing ranges from 0.3mm to 1.5mm.
  • the spacing between two adjacent battery cells is a negative spacing, the spacing ranges from -0.3mm to -1.0mm.
  • a busbarless IBC battery string includes the above-mentioned plurality of busbarless IBC battery assembly units and bus strips 70 .
  • the grid IBC battery module units are connected in parallel through the bus strip 70 .
  • FIG. 5 is a schematic diagram of an arrangement and installation of busbarless IBC battery module units in a busbarless IBC battery string according to an embodiment of the present invention.
  • the front glass 50 in the busbarless IBC battery module unit is omitted in Figure 5
  • the first encapsulating film 30, the second encapsulating film 40 and the backsheet layer 60 only the battery sheet layer 10 (including the first battery sheet 11 and the second battery sheet) in the mainbarless IBC battery module unit is marked. 12), conductive strip 20 and bus strip 70.
  • the conductive tape 20 is connected to the back surface of the first battery sheet 11 and the second battery sheet 12 , and the first battery sheet 11 and the second battery sheet 12 are connected as described above.
  • the modes are alternately arranged in the first direction.
  • the busbarless IBC battery pack is realized by utilizing the bus strips 70 The units are connected in parallel.
  • FIG. 6 is a flow chart of a method of manufacturing a busbarless IBC battery module unit according to an embodiment of the present invention. Referring to Figure 6, the manufacturing method includes step S610, step S620 and step S630.
  • step S610 first low-temperature welding wires 21 and second low-temperature welding wires 22 are formed parallel to each other and alternately arranged on the carrier film 23 to form the conductive strip 20 .
  • step S610 includes:
  • a plurality of low-temperature welding wires are positioned in parallel at equal intervals through positioning wheels and placed alternately on the carrier film 23, and the low-temperature welding wires and the carrier film 23 are thermally pressed together through a hot pressing mechanism, so that all the low-temperature welding wires are The low-temperature welding wire and the carrier film 23 are combined into one body.
  • the low-temperature welding wire is punched and cut to form first cutting points 24 and second cutting points 25 respectively, thereby forming the first low-temperature welding wire 21 and the second low-temperature welding wire 22 to obtain the conductive tape 20 .
  • first cutting points 24 and the first low-temperature welding wire 21 are spaced apart in the first direction
  • second cutting points 25 and the second low-temperature welding wire 22 are spaced apart in the first direction
  • the first cutting points 24 and the second cutting points 25 are arranged in an alternately displaced manner in the second direction; the first direction is perpendicular to the second direction.
  • step S620 the first battery sheet 11 and the second battery sheet 12 are arranged on the conductive tape 20, and hot pressing is performed so that the first battery sheet 11 and the second battery sheet 12 are in contact with the conductive tape 20.
  • the conductive tape 20 is bonded and fixed.
  • the conductive belt 20 is laid on the conveyor belt and fixed by vacuum adsorption on the bottom plate; secondly, the first battery sheet 11 and the second battery sheet 12 are arranged on the conductive belt 20. And make the battery back surfaces of the first battery sheet 11 and the second battery sheet 12 contact the conductive tape 20; then, heat press the first battery sheet 11 and the second battery sheet 12 to The first battery sheet 11 and the second battery sheet 12 are bonded and fixed to the conductive tape 20 .
  • the back surfaces of the first battery sheet 11 and the second battery sheet 12 are provided with evenly distributed positive electrode fine grid lines and negative electrode fine grid lines.
  • the first direction is parallel to each other and arranged alternately.
  • the first low-temperature welding wire 21 and the second low-temperature welding wire 22 are in vertical contact with the positive and negative electrode fine grid lines.
  • the first direction is the arrangement direction of the battery sheets.
  • the temperature of the hot pressing is 120°C to 250°C; the time of the hot pressing is 2s to 8s.
  • the manufacturing method before arranging the first battery sheet 11 and the second battery sheet 12 on the conductive tape 20, the manufacturing method further includes:
  • Alternate contact regions 15 and insulation regions 16 are formed on the positive electrode fine grid lines and the negative electrode fine grid lines of the first battery sheet 11 and the second battery sheet 12 .
  • the contact areas 15 and the insulating areas 16 are linearly arranged and spaced apart in the first direction, and the contact areas 15 and the insulating areas 16 are alternately distributed in the second direction.
  • solder paste solder joints are formed on the contact area 15 , and insulating glue is coated on the insulation area 16 .
  • the positive and negative electrode thin grid lines on the backs of the batteries of the first battery sheet 11 and the second battery sheet 12 are in contact with the low-temperature welding wires of the conductive tape 20 .
  • one end of the first low-temperature welding wire 21 is in vertical contact with the positive electrode thin grid line of the first battery piece 11, and the other end of the first low-temperature welding wire 21 is in vertical contact with the negative electrode thin grid line of the second battery piece 12; so
  • One end of the second low-temperature welding wire 22 is in vertical contact with the negative electrode thin grid line of the first battery piece 11 , and the other end of the second low-temperature welding wire 22 is in vertical contact with the positive electrode thin grid line of the second battery piece 12 .
  • step S630 lamination equipment is used to laminate the first battery sheet 11 and the second battery sheet 12, so that the first battery sheet 11 and the second battery sheet 12 are connected to the conductive Take 20 for welding.
  • the positive and negative electrode thin grid lines on the back of the batteries of the first battery sheet 11 and the second battery sheet 12 are welded to the low-temperature welding wire on the conductive tape 20 .
  • the lamination temperature is 135°C to 150°C.
  • the busbarless IBC battery module unit also includes a first encapsulating film 30 , a second encapsulating film 40 , a front glass layer 50 and a back plate layer 60 .
  • first battery sheet 11 and the second battery sheet 12 are laminated using a lamination equipment, so that the first battery sheet 11 and the second battery sheet 12 are connected with the conductive tape.
  • 20 for welding methods specifically including:
  • the first encapsulating film 30 and the backsheet layer 60 are sequentially placed on the surface of the conductive tape 20 facing away from the first battery sheet 11 and the second battery sheet 12 , and on the The second encapsulating adhesive film 40 and the front glass layer 50 are sequentially placed on the front surfaces of the first battery sheet 11 and the second battery sheet 12 , and lamination equipment is used to laminate the placed stacks. Pressure to form an integrated battery structure.
  • the positive and negative electrode thin grid lines on the battery backs of the first battery sheet 11 and the second battery sheet 12 are welded to the low-temperature welding wire on the conductive tape 20 .
  • the main grid-less IBC battery module unit and its manufacturing method provided by the invention use low-temperature welding wire on the conductive tape to replace the main grid wires on the back of the IBC cells to realize interconnection welding and current flow between the IBC cells.
  • the main grid lines in conventional IBC cells can be removed, reducing the usage of silver paste, which in turn helps reduce the manufacturing cost of IBC solar cell modules.
  • the current transmission distance can also be shortened, and the series resistance of the cells can be reduced, thereby improving the efficiency of the solar cell module; and the greater the number of low-temperature welding wires, the more It is conducive to improving the tolerance of cell cracks, which is more conducive to improving the performance of solar cell modules.
  • the encapsulating adhesive film covering the conductive tape is an integrated adhesive film composed of a two-layer structure of a reinforcement layer and an adhesive film layer, which can not only provide skeleton support for the conductive tape, but also prevent low-temperature welding wire from being attached to the conductive tape. The occurrence of offset distortion causes a short circuit in the IBC cell sheet, and is conducive to achieving good ohmic contact between the low-temperature welding wire and the positive and negative electrode thin grid lines of the IBC cell sheet.
  • the manufacturing method of the main gridless IBC battery assembly provided by the present invention adopts low-temperature lamination welding to weld and fix the IBC battery sheets and the conductive tape, which is beneficial to alleviate the process of welding and interconnection between the battery sheets. Warping of battery cells caused by high temperature and uneven welding stress will help reduce the fragmentation rate of battery cells, improve component yield, and also facilitate the development of thinner cells.

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  • Engineering & Computer Science (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Energy (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention concerne une unité de module de batterie IBC sans grille principale, comprenant : un premier élément de batterie et un second élément de batterie, la surface arrière de chaque élément de batterie comportant des lignes de grille fines positives et des lignes de grille fines négatives qui sont parallèles les unes aux autres et sont agencées en alternance ; et une bande conductrice comprenant des premiers filaments de soudure à basse température et des seconds filaments de soudure à basse température qui sont parallèles l'un à l'autre et sont agencés en alternance, et un film de support. Le premier élément de batterie et le second élément de batterie sont soudés à la bande conductrice au moyen d'une stratification, les premiers filaments de soudure à basse température et les seconds filaments de soudure à basse température étant soudés verticalement respectivement aux lignes de grille fines positives et négatives. Selon l'unité de module de batterie IBC sans grille principale et son procédé de fabrication, des lignes de grille principales d'éléments de batterie sont remplacées par des filaments de soudure à basse température, de telle sorte que la consommation de pâte d'argent peut être réduite, ce qui facilite la réduction des coûts de production et de fabrication, et améliore les performances du module de batterie. De plus, les éléments de batterie IBC sont soudés de manière fixe à la bande conductrice au moyen d'une stratification et d'une soudure à basse température, de telle sorte que les problèmes de température de soudure excessivement élevée et de contrainte de soudure non uniforme présents lorsque les éléments de batterie sont interconnectés au moyen d'une soudure peuvent être atténués.
PCT/CN2023/101117 2022-07-12 2023-06-19 Unité de module de batterie ibc sans grille principale et son procédé de fabrication, module de batterie et chaîne de modules de batterie WO2024012161A1 (fr)

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CN115295651A (zh) * 2022-07-12 2022-11-04 青海黄河上游水电开发有限责任公司西宁太阳能电力分公司 无主栅ibc电池组件单元及制作方法、电池组件、电池组串
CN116314365A (zh) * 2022-11-25 2023-06-23 青海黄河上游水电开发有限责任公司西宁太阳能电力分公司 分段低温焊带、无主栅ibc电池串、电池组件及其封装方法
CN118116984B (zh) * 2024-04-28 2024-09-06 隆基绿能科技股份有限公司 一种太阳能电池和光伏组件
CN118555847A (zh) * 2024-07-30 2024-08-27 武汉理工大学 一种无划线钙钛矿太阳电池单元、组件及其制备方法

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