WO2023147714A1 - 太阳能电池串、太阳能电池电池组件以及太阳能电池系统 - Google Patents

太阳能电池串、太阳能电池电池组件以及太阳能电池系统 Download PDF

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Publication number
WO2023147714A1
WO2023147714A1 PCT/CN2022/089863 CN2022089863W WO2023147714A1 WO 2023147714 A1 WO2023147714 A1 WO 2023147714A1 CN 2022089863 W CN2022089863 W CN 2022089863W WO 2023147714 A1 WO2023147714 A1 WO 2023147714A1
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WO
WIPO (PCT)
Prior art keywords
electrode
battery
cell
solar cell
string according
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PCT/CN2022/089863
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English (en)
French (fr)
Inventor
王永谦
许文理
杨新强
陈刚
Original Assignee
广东爱旭科技有限公司
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Publication of WO2023147714A1 publication Critical patent/WO2023147714A1/zh

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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
    • 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
    • H01L31/04—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
    • 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 cells, and in particular relates to a solar cell string, a solar cell assembly and a solar cell system.
  • a solar cell is a semiconductor device that converts light energy into electrical energy. High application reliability, low production cost and high energy conversion efficiency have always been the goals pursued by the solar cell industry. After the solar cells are prepared, various interconnection technologies need to be used to form solar cell strings from each solar cell to realize the application.
  • MBB ribbon method design multiple sets of pad points and bus bars on the battery sheet, use ribbons to connect each set of pad points, and finally transfer the current on the ribbons through the bus bars Form a series connection with the next cell.
  • Convergence welding method between two batteries design pad points at both ends of the battery slices, and use structured soldering tape to weld the edge pad points of the two battery slices to form a series connection between the battery slices.
  • Integrated backplane mode cover the backplane with a patterned metal film, and the backplane is connected to multiple sets of pad points or thin grid lines on the cell to lead out the current of the cell, and at the same time, the patterned metal film is passed between the cells. Copper films are connected in series, and in order to ensure sufficiently low resistance loss, the metal film needs to cover more than half of the backplane area.
  • the metal film is often made of silver, aluminum and other materials, resulting in a higher cost of the cell; the thermal expansion of the metal material will affect the alignment of the pattern, and it is easy to cause open circuit, open circuit, etc. Adverse consequences lead to low reliability of the cell.
  • the technical problem to be solved by the present invention is to provide a solar battery string, aiming to solve the technical problems of high cost and poor reliability of the existing solar battery interconnection technology.
  • the present invention provides a solar cell string, the solar cell string comprising:
  • At least two battery sheets each of which includes a first electrode and a second electrode opposite in polarity to the first electrode;
  • the conductive interconnection film Connecting the first cell and the conductive interconnection film of the second cell adjacent to the first cell, the conductive interconnection film includes a first end arranged along the extending direction of the solar cell string, connected to the first cell a second end disposed opposite to one end and an intermediate section respectively connecting the first end and the second end;
  • the first end is conductively connected to the first electrode of the first cell, and the second end is conductively connected to the second electrode of the second cell; or, the first end is conductively connected to the first
  • the first electrode of the battery sheet is electrically connected, and the second end is electrically connected to the first electrode of the second battery sheet;
  • the thickness of the middle section is less than 500um.
  • the thickness of the middle section is less than 100um.
  • the thicknesses of the first end and the second end are both less than 200um, and the thickness of the middle section is less than or equal to 50um.
  • the thickness of the middle section is less than or equal to the thickness of the first end.
  • the thickness of the middle section is less than or equal to the thickness of the second end.
  • the ratio of the area of the conductive interconnection film to the total area of the first battery sheet and the second battery sheet is less than 50%.
  • the ratio of the area of the conductive interconnection film to the total area of the first battery sheet and the second battery sheet is less than or equal to 25%.
  • the ratio of the area of the conductive interconnection film to the total area of the first battery sheet and the second battery sheet is less than or equal to 10%.
  • the solar cell string further includes an insulating layer disposed in the region where the conductive interconnection film is located, covering the second electrode of the first battery sheet and the first electrode of the second battery sheet.
  • the insulating layer is disposed on the second electrode of the first cell and the first electrode of the second cell.
  • the insulating layer is disposed on the conductive interconnection film.
  • the conductive interconnection film only covers the first electrode of the first cell and the second electrode of the second cell.
  • the middle section includes several first middle regions, the first middle regions are arranged in parallel, and the two ends of the first middle regions are respectively connected to the first end and the second end.
  • the middle section includes several second middle regions, the second middle regions are arranged in a crossing manner, and the two ends of the second middle regions are respectively connected to the first end and the second end.
  • first end and/or the second end is provided with a surrounding hollow area, and the surrounding hollow area surrounds the first end and the first electrode and/or the second end and The connection area of the second electrode, but does not form a closure;
  • the middle section includes several third middle regions, and each third middle region can form an angular hollow connected or not connected with the surrounding hollow region district.
  • the battery sheet is provided with a first pad point and a second pad point, the first pad point is connected to the first electrode, the second pad point is connected to the second electrode, and the first pad point is connected to the second electrode.
  • terminal is conductively connected to the first electrode of the first battery slice through the first pad point of the first battery slice, and the second terminal is connected to the second battery slice through the second pad point of the second battery slice.
  • the battery sheet is provided with a first main grid and a second main grid, the first main grid is connected to the first electrode, the second main grid is connected to the second electrode, and the first main grid is connected to the second electrode.
  • the terminal is electrically connected to the first electrode of the first battery slice through the first main grid of the first battery slice, and the second terminal is connected to the second battery slice through the second main grid of the second battery slice.
  • the second electrode of the sheet is electrically connected.
  • the length of the first end is L1, and the width of the first end is D1;
  • the length of the second end is L2, and the width of the second end is D2;
  • the length of the middle section is L3, and the width of the middle section is D3;
  • the length of the intermediate section along the first direction in which the solar cell strings extend is L4, and the width of the intermediate section along the second direction perpendicular to the first direction is for D4;
  • L4 is less than 3cm
  • D4 is less than 3cm
  • the adjacent edge of the first battery piece and the second battery piece is a first edge, and the first end is far away from and parallel to the first center line of the first edge and the first edge.
  • the distance of the edge is L5;
  • the adjacent edge of the second battery piece and the first battery piece is a second edge, and the distance between the second end and the second centerline away from and parallel to the second edge is L6;
  • L5 is less than 30cm
  • L6 is less than 30cm
  • L5 is less than 5cm
  • L6 is less than 5cm
  • the battery sheet is a double-sided battery sheet, the first end is connected to the first electrode on the front of the first battery sheet, and the second end is connected to the second electrode on the back of the second battery sheet.
  • each conductive interconnection film is not connected to each other.
  • the conductive interconnection film is made of one or more materials selected from copper, silver or aluminum.
  • conductive glue or solder paste is provided between the first electrode and the first end, and between the second electrode and the second end.
  • the present invention also provides a solar cell assembly, the solar cell assembly includes the above-mentioned solar cell string.
  • the present invention also provides a solar cell system, which includes the above-mentioned solar cell assembly.
  • the conductive interconnection film includes a first end connected to the first cell, a second end connected to the second cell, and an intermediate segment respectively connected to the first end and the second end, and the conductive interconnection film realizes The conductive connection of the first battery piece and the second battery piece, wherein the thickness of the middle section is less than 500um.
  • the solar battery string realizes the conductive connection between each battery piece through the conductive interconnection film, without the need for a welding strip, which can avoid the problems of bending and stress concentration of the battery piece caused by the installation of the welding strip, and the conductive interconnection film passes through the first One end is connected to the first cell, and the second end is connected to the second cell.
  • the coverage area is less than 50%, and the thickness of the middle section used to connect the first end and the second end is small. , which can greatly reduce the impact of the thermal expansion of conductive materials on the accuracy of patterning.
  • the solar cell string does not have a ribbon and uses a conductive interconnection film in a small area, the production cost can be greatly reduced. For the GW production level, it can effectively Help manufacturers control costs.
  • Fig. 1 is a schematic diagram of a solar cell string provided by an embodiment of the present invention
  • Fig. 2 is a schematic diagram of a back contact battery sheet provided by an embodiment of the present invention.
  • Fig. 3 is a schematic diagram of a second possible realization of the conductive interconnection film provided by the embodiment of the present invention.
  • Fig. 4 is a schematic diagram based on the middle section of Fig. 3;
  • Fig. 5 is a schematic diagram of a third possible implementation of the conductive interconnection film provided by the embodiment of the present invention.
  • Fig. 6 is a schematic diagram of a fourth possible realization of the conductive interconnection film provided by the embodiment of the present invention.
  • Fig. 7 is a schematic diagram of a fifth possible implementation of the conductive interconnection film provided by the embodiment of the present invention.
  • FIG. 8 is an enlarged view based on part A in FIG. 1 .
  • the solar battery string of the present invention includes at least two battery slices and a conductive interconnection film for connecting each battery slice.
  • the conductive interconnection film includes a first end, a second end and an intermediate section respectively connected to the first end and the second end.
  • the conductive interconnection The film is conductively connected to the first cell through the first end, and conductively connected to the second cell through the second end to realize the conductive connection with each cell, wherein the thickness of the middle section is less than 500um.
  • the solar battery string realizes the conductive connection between each battery piece through the conductive interconnection film, without the need for a welding strip, which can avoid the problems of bending and stress concentration of the battery piece caused by the installation of the welding strip, and the conductive interconnection film passes through the first One end is connected to the first cell, and the second end is connected to the second cell. Only a small area needs to be covered on each cell, the coverage area is less than 50%, and the thickness of the middle section used to connect the first end and the second end is small. , which can greatly reduce the impact of the thermal expansion of conductive materials on the accuracy of patterning.
  • the solar cell string does not have a ribbon and uses a conductive interconnection film in a small area, the production cost can be greatly reduced. For the GW production level, it can effectively Help manufacturers control costs.
  • the first embodiment provides a solar cell string
  • the solar cell string includes:
  • At least two battery sheets each of which includes a first electrode and a second electrode opposite in polarity to the first electrode;
  • the first terminal 21 is conductively connected to the first electrode of the first cell 11, and the second terminal 22 is conductively connected to the second electrode of the second cell 12; or, the first terminal 21 Conductively connected to the first electrode of the first cell 11, the second terminal 22 is conductively connected to the first electrode of the second cell 12;
  • the thickness of the middle section 23 is less than 500um.
  • the solar battery string is a battery string formed by conductively connecting at least two battery slices through the conductive interconnect film 2, and the solar battery string may include two battery slices, three battery slices, four battery slices or other For more battery slices, the number of battery slices that need to be connected can be determined according to the actual usage.
  • the cells located at both ends of the solar cell string are defined as end cells, and when the solar cell string includes more than two cells, the cells connected between the two end cells are defined as internal cells piece.
  • the cell can be any type of cell, such as PERC cell, HJT cell, topcon cell, IBC cell, etc.
  • the battery sheet includes a first electrode and a second electrode opposite to the first electrode.
  • the first electrode is a positive electrode
  • the second electrode is a negative electrode.
  • the first electrode is a negative electrode
  • the second electrode is a positive electrode.
  • the boron-doped P-type region is the positive electrode
  • the phosphorus-doped N-type region is the negative electrode.
  • the first electrode 111 can be a positive electrode
  • the second electrode 112 can be a negative electrode
  • the two are alternately arranged on the battery Chip.
  • the cell is a double-sided cell, such as PERC cell, HJT cell or topcon cell
  • the first electrode is set on one side (for example, the front side), which can be
  • the second electrode is arranged on the other side (for example, the back side), which can be a negative electrode.
  • each battery piece is electrically connected through the conductive interconnection film 2 .
  • the conductive interconnection film 2 is arranged between the two battery slices.
  • the conductive interconnection film 2 is arranged between two battery slices.
  • a conductive interconnection film 2 is also provided between two battery sheets.
  • first battery slice 11 and the second battery slice 12 are in an adjacent relationship, that is to say, for adjacent battery slices, one side of the battery slice is the first battery slice 11, and the other side of the battery slice is the first battery slice 11.
  • One battery slice is the second battery slice 12 . It does not limit the number of battery slices, that is, it does not limit the battery string to only have two battery slices.
  • the first battery piece 11 and the second battery piece 12 can be adjacent to the left and right, or can be adjacent to the top and bottom, depending on the arrangement of each battery piece.
  • the conductive interconnect film 2 includes a first end 21 connected to the first cell 11, a second end 22 connected to the second cell 12, and an intermediate section 23 respectively connected to the first end 21 and the second end 22.
  • One end 21 is arranged along the extending direction of the solar battery string, and the second end 22 is arranged opposite to the first end 21 .
  • the extending direction of the solar cell strings refers to the direction in which the solar cell strings are connected in series, that is, the placement direction of the solar cell strings. When the solar cell strings are placed vertically, the extending direction of the solar cell strings is the vertical direction.
  • One end 21 is arranged along the vertical direction.
  • the extending direction of the solar cell strings is the horizontal direction
  • the second end 22 of the conductive interconnection film 2 is arranged along the horizontal direction.
  • the first end 21 of the conductive interconnection film 2 is arranged along the vertical direction
  • the second end 22 is arranged in the opposite direction of the vertical direction, that is, the positions of the first end 21 and the second end 22 meet the requirements of one end of the conductive interconnection film 2, The location requirement at the other end.
  • the second end 22 is arranged in the opposite direction of the horizontal direction, that is, the positions of the first end 21 and the second end 22 meet the requirements of one end of the conductive interconnection film 2, The location requirement at the other end.
  • the first end 21 of the conductive interconnection film 2 is electrically connected to the first electrode of the first battery sheet 11, and the second end 22 is electrically connected to the second electrode of the second battery sheet 12.
  • the first battery sheet 11 and the second battery sheet 12 form a serial relationship.
  • the first electrode of the first cell 11 is a positive electrode
  • the second electrode of the first cell 11 is a negative electrode
  • the first electrode of the second cell 12 is a positive electrode
  • the second electrode of the second cell 12 is a positive electrode.
  • the second electrode of the second cell 12 is a positive electrode.
  • the negative electrode for the negative electrode.
  • the first electrode of the first cell 11 is a negative electrode
  • the second electrode of the first cell 11 is a positive electrode
  • the first electrode of the second cell 12 is a negative electrode
  • the second electrode of the second cell 12 is a negative electrode. for the positive electrode.
  • the first end 21 of the conductive interconnection film 2 is electrically connected to the first electrode of the first battery sheet 11, and the second end 22 is electrically connected to the first electrode of the second battery sheet 12.
  • the first battery sheet 11 and the second battery sheet Sheets 12 form a parallel relationship.
  • the first electrode of the first cell 11 is a positive electrode
  • the second electrode of the first cell 11 is a negative electrode
  • the first electrode of the second cell 12 is a positive electrode
  • the second electrode of the second cell 12 is a positive electrode.
  • the second electrode of the second cell 12 is a positive electrode. for the negative electrode.
  • the first electrode of the first cell 11 is a negative electrode
  • the second electrode of the first cell 11 is a positive electrode
  • the first electrode of the second cell 12 is a negative electrode
  • the second electrode of the second cell 12 is a negative electrode. for the positive electrode.
  • the conductive interconnect film 2 is a complete rectangle, and the conductive interconnect film 2 is the first end 21 at the corresponding position of the first battery sheet 11, and the first end 21 at the corresponding position of the second battery sheet.
  • the position corresponding to 12 is the second end 22 , and the position between the first battery piece 11 and the second battery piece 12 is the middle section 23 .
  • This embodiment is the first implementation of the conductive interconnection film 2 .
  • the insulating area may be a non-conductive tape or insulating film, or any other suitable non-conductive shield or cover; the insulating area may comprise materials such as polypropylene or polyethylene, and may include an acrylic adhesive layer.
  • the insulating region is sandwiched between the first electrodes and the second electrodes, and the insulating function of the insulating regions prevents the first electrodes and the second electrodes from contacting and short-circuiting.
  • a first insulating region is provided between the first electrode and the second electrode of the first battery sheet 11; in the second battery sheet 12, the first electrode and the second electrode of the second battery sheet 12
  • a second insulating region is provided between the second electrodes.
  • the thickness of the middle section 23 is less than 500um.
  • the thickness of the middle section 23 can be set to 10um, 50um, 100um, 150um, 200um, 250um, 300um, 350um or 400um, or be set to other parameter values less than 500um, but it should be noted that the middle section 23 cannot be set to 0um.
  • the thickness of the middle section 23 is small and has a certain degree of flexibility, which can effectively reduce the stress while ensuring the reliable connection between the battery pieces.
  • Step 1 Prepare a substrate, and cover the substrate with adhesive film, EVA or POE.
  • Step 2 affixing the conductive interconnection film 2 on the substrate.
  • Step 3 disposing conductive glue or solder paste on the conductive interconnection film 2 , or disposing conductive glue or solder paste on the first electrode and the second electrode.
  • Step 4 Regularly place the cells on the substrate prepared in step 3, and align the first electrode and the second electrode with the corresponding conductive interconnection film 2 to realize the connection between the cell sheet and the conductive interconnection film.
  • Step 1 Prepare a substrate, and cover the substrate with adhesive film, EVA or POE.
  • Step 2 disposing conductive glue or solder paste on the conductive interconnection film 2 , or disposing conductive glue or solder paste on the first electrode and the second electrode.
  • Step 3 Arrange the battery slices regularly, and paste the conductive interconnection film 2 on the adjacent battery slices to form a battery string.
  • Step 4 Place the battery strings prepared in Step 3 on the substrate.
  • the conductive interconnection film 2 includes a first end 21 connected to the first cell 11, a second end 22 connected to the second cell 12, and an intermediate segment connected to the first end 21 and the second end 22 respectively. 23.
  • the solar battery string realizes the conductive connection between each battery piece through the conductive interconnection film 2, without the need for a welding strip, which can avoid the problems of bending and stress concentration of the battery piece caused by the installation of the welding strip, and the conductive interconnection film 2 passes through
  • the first terminal 21 is connected to the first battery piece 11, and the second terminal 22 is connected to the second battery piece 12.
  • the coverage area is less than 50%, and it is used to connect the first terminal 21 and the second battery piece.
  • the thickness of the middle section 23 of the two ends 22 is small, which can greatly reduce the influence of the thermal expansion of the conductive material on the patterning accuracy.
  • the production capacity can be greatly reduced. Cost, for the GW capacity level, can effectively help manufacturers control costs.
  • the thickness of the middle section 23 in the second embodiment is less than 100 um.
  • the thickness of the middle section 23 can be set to 10um, 20um, 30um, 40um, 50um, 60um, 70um, 80um or 90um, or set to other parameter values less than 100um, but it should be noted that the middle section 23 cannot be set to 0um.
  • the thickness of the middle section 23 is small and has a certain degree of flexibility, which can effectively reduce the stress while ensuring the reliable connection between the battery pieces.
  • the thicknesses of the first end 21 and the second end 22 are both less than 200um, and the thickness of the middle section 23 is less than or equal to 50um.
  • the thickness of the first end 21 can be set to 20um, 40um, 60um, 80um, 100um, 120um, 140um, 160um, 180um, or other parameter values less than 200um, but it should be noted that the One end 21 cannot be set to 0um.
  • the thickness of the second end 22 can be set to 20um, 40um, 60um, 80um, 100um, 120um, 140um, 160um, 180um, or other parameter values less than 200um, but it should be noted that the second end 22 cannot be set to 0um.
  • the thicknesses of the first end 21 and the second end 22 can be the same or different, which are set according to the specifications of the first cell 11 and the second cell 12 . However, since the first battery piece 11 and the second battery piece 12 generally adopt the same specification, the first end 21 and the second end 22 generally have the same thickness.
  • the thickness of the middle section 23 can be set to 5um, 10um, 15um, 20um, 25um, 30um, 35um, 40um, 45um or 50um, or be set to other parameter values less than or equal to 50um, but it needs to be explained Yes, the middle section 23 cannot be set to 0um.
  • the thicknesses of the first end 21 , the second end 22 and the middle section 23 are all small, which can effectively reduce the stress while ensuring the reliable connection between the first battery piece 11 and the second battery piece 12 .
  • the thickness of the middle section 23 in the fourth embodiment is less than or equal to the thickness of the first end 21 . Since the first end 21 needs to be connected to the first electrode of the first cell 11 to realize the current transfer of the first electrode, and the middle section 23 only needs to connect the first end 21 and the second end 22 to realize the first end 21 and the second end.
  • the thickness of the middle section 23 in the fifth embodiment is less than or equal to the thickness of the second end 22 . Since the second end 22 needs to be connected to the first electrode of the second battery slice 12 to realize the current transmission of the first electrode, or needs to be connected to the second electrode of the second battery slice 12 to realize the current transmission of the second electrode, and the middle section 23 It is only necessary to connect the first end 21 and the second end 22 to realize the current transmission between the first end 21 and the second end 22, so the thickness of the middle section 23 is set to be less than or equal to the thickness of the second end 22, which can It is possible to set the thickness of the middle section 23 to a relatively low value, which can still effectively reduce stress while ensuring effective transmission of current.
  • a preferred implementation manner is to set the thickness of the middle section 23 to be less than or equal to the thickness of the first end 21 and less than or equal to the thickness of the second end 22 .
  • the ratio of the area of the conductive interconnection film 2 to the total area of the first battery sheet 11 and the second battery sheet 12 in the sixth embodiment is less than 50%.
  • the above means that the ratio of the sum of the areas of the first end 21 , the second end 22 and the middle section 23 of the conductive interconnection film 2 to the sum of the areas of the first cell 11 and the second cell 12 is less than 50%. If there are multiple conductive interconnection films 2 , the above refers to the sum of the areas of the first end 21 , the second end 22 and the middle section 23 of all the conductive interconnection films 2 .
  • the conductive interconnection film 2 is connected to the first cell 11 through the first end 21, connected to the second cell 12 at the second end 22, and connected to the first end 21 and the second end 22 respectively through the middle section 23, requiring only a small area Covering each battery sheet, the coverage area is less than 50%, which can greatly reduce the impact of the thermal expansion of the conductive material on the patterning accuracy, and can greatly reduce the production cost.
  • the above-mentioned area ratio can be set to 1%, 10%, 20%, 30%, 40% or 50%, or other parameter values less than 50%, but it should be noted that the above-mentioned area ratio Cannot be selected as 0%.
  • the ratio of the area of the conductive interconnection film 2 to the total area of the first battery sheet 11 and the second battery sheet 12 in the seventh embodiment is less than or equal to 25%.
  • the above means that the ratio of the sum of the areas of the first end 21 , the second end 22 and the middle section 23 of the conductive interconnection film 2 to the sum of the areas of the first battery sheet 11 and the second battery sheet 12 is less than or equal to 25%. If there are multiple conductive interconnection films 2 , the above refers to the sum of the areas of the first end 21 , the second end 22 and the middle section 23 of all the conductive interconnection films 2 .
  • the conductive interconnection film 2 is connected to the first cell 11 through the first end 21, connected to the second cell 12 at the second end 22, and connected to the first end 21 and the second end 22 respectively through the middle section 23, requiring only a small area Covering on each cell, the coverage area is less than or equal to 25%, which can greatly reduce the impact of the thermal expansion of the conductive material on the patterning accuracy, and can greatly reduce the production cost.
  • the above area ratio can be set to 1%, 5%, 10%, 15%, 20% or 25%, or set to other parameter values less than or equal to 25%, but it should be noted that the above The area ratio cannot be selected as 0%.
  • the ratio of the area of the conductive interconnection film to the total area of the first cell and the second cell in the eighth embodiment is less than or equal to 10%.
  • the above means that the ratio of the sum of the areas of the first end 21 , the second end 22 and the middle section 23 of the conductive interconnection film 2 to the sum of the areas of the first battery sheet 11 and the second battery sheet 12 is less than or equal to 10%. If there are multiple conductive interconnection films 2 , the above refers to the sum of the areas of the first end 21 , the second end 22 and the middle section 23 of all the conductive interconnection films 2 .
  • the conductive interconnection film 2 is connected to the first cell 11 through the first end 21, connected to the second cell 12 at the second end 22, and connected to the first end 21 and the second end 22 respectively through the middle section 23, requiring only a small area Covering on each cell, the coverage area is less than or equal to 10%, which can greatly reduce the impact of the thermal expansion of the conductive material on the patterning accuracy, and can greatly reduce the production cost.
  • the above-mentioned area ratio can be set to 1%, 3%, 5%, 7% or 9%, or set to other parameter values less than or equal to 10%, but it should be noted that the above-mentioned area ratio must not Choose 0%.
  • the solar cell string in Embodiment 9 further includes a second electrode disposed in the area where the conductive interconnection film 2 is located, covering the first battery sheet 11 and the second battery sheet 12 insulating layer of the first electrode.
  • the current is in the "second One electrode-first end 21-middle section 23-second end 22-second electrode", so by setting an insulating layer, it is possible to avoid the connection between the first electrode and the second electrode of the first cell 11.
  • the short circuit can also avoid the short circuit caused by the connection between the first electrode and the second electrode of the second battery piece 12 .
  • the insulating layer of the tenth embodiment is disposed on the second electrode of the first cell 11 and the first electrode of the second cell 12 .
  • the insulating layer may be a non-conductive tape or insulating film, or any other suitable non-conductive shield or cover; the insulating layer may comprise materials such as polypropylene or polyethylene and may include an acrylic adhesive layer.
  • the insulating layer is arranged on the second electrode of the first battery sheet 11, which can avoid the short circuit caused by the connection between the first electrode and the second electrode of the first battery sheet 11, and the insulating layer is arranged on the first electrode of the second battery sheet 12 , can avoid the short circuit caused by the connection between the first electrode and the second electrode of the second battery piece 12 .
  • the insulating layer of the eleventh embodiment is disposed on the conductive interconnection film 2 .
  • an insulating layer is provided on the region of the conductive interconnection film 2 corresponding to the second electrode of the first cell 11 and the region corresponding to the first electrode of the second cell 12 .
  • the insulating layer may be a non-conductive tape or insulating film, or any other suitable non-conductive shield or cover; the insulating layer may comprise materials such as polypropylene or polyethylene and may include an acrylic adhesive layer.
  • the conductive interconnection film 2 of Embodiment 12 only covers the first electrode of the first cell 11 and the second electrode of the second cell 12 .
  • the conductive interconnection film 2 only covers the first electrode of the first battery sheet 11 and the second electrode of the second battery sheet 12, but does not cover the second electrode of the first battery sheet 11 and the first electrode of the second battery sheet 12, so The current is only transmitted between "the first electrode-the first end 21-the middle section 23-the second end 22-the second electrode", the first electrode and the second electrode of the first cell 11 are not connected, and the second cell The first electrode and the second electrode of 12 are also not connected, which can avoid the short circuit caused by the connection of the first electrode and the second electrode of the first battery piece 11, and can also avoid the first electrode and the second electrode of the second battery piece 12. Short circuit caused by connection.
  • the middle section 23 of the thirteenth embodiment includes several first middle regions, the first middle regions are arranged in parallel, and the two ends of the first middle regions The first end 21 and the second end 22 are respectively connected.
  • This embodiment is the second implementation of the conductive interconnection film 2.
  • the middle section 23 can extend to the corresponding positions of the first battery sheet 11 and the second battery sheet 12, not just at the first battery sheet 11 and the second battery sheet. between the two battery sheets 12 .
  • first intermediate regions are arranged in parallel, and hollow regions are formed between each first intermediate region, which can effectively reduce stress, save materials and reduce costs.
  • the middle section 23 of the fourteenth embodiment includes several second middle regions, the second middle regions are arranged in a cross, and the two ends of the second middle regions The first end 21 and the second end 22 are respectively connected.
  • This embodiment is the third implementation of the conductive interconnection film 2.
  • the middle section 23 can extend to the corresponding positions of the first battery sheet 11 and the second battery sheet 12, not just at the first battery sheet 11 and the second battery sheet. between the two battery sheets 12 .
  • second intermediate regions are intersected so that a hollow region is formed between the first battery sheet 11 and the second battery sheet 12, which can effectively reduce stress, save materials and reduce costs.
  • the second middle area adopts a diagonal design instead of a design perpendicular to the edge of the cell, which can effectively solve the stress problem caused by the shrinkage and expansion of the battery cells caused by the release of cold and heat.
  • the first end 21 and/or the second end 22 of the fifteenth embodiment is provided with a surrounding hollow area, and the surrounding hollow area surrounds the first end 21 and the The first electrode and/or the connection area between the second end 22 and the second electrode, but does not form a closure;
  • the middle section 23 includes a number of third middle regions, and can be formed between each third middle region
  • the angular hollow area 231 is connected and/or not connected with the surrounding hollow area.
  • the surrounding hollow area refers to the hollow area designed around the connection area between the first end 21 and the first electrode and/or the connection area between the second end 22 and the second electrode as the center, but there are connection areas and intermediate 23, the surrounding hollow area needs to be designed as an open hollow area instead of a closed hollow area.
  • the surrounding hollowed-out area may adopt a meniscus-shaped design, which extends behind the centerline of the first end 21 and/or the second end 22 .
  • the angular hollow area 231 may be in a triangular shape.
  • the first end 21 is provided with a first surrounding hollow area 211, and the first surrounding hollow area 211 surrounds the connection area between the first end 21 and the first electrode, but does not form a closure, so as to avoid the connection between the first end 21 and the first electrode.
  • the connection area of the electrode and the second end 22 are disconnected;
  • the second end 22 is provided with a second surrounding hollow area 221, and the second surrounding hollow area 221 surrounds the connection area between the second end 22 and the second electrode, but does not form a closure, avoiding The connection area between the second terminal 22 and the second electrode is disconnected from the first terminal 21 .
  • the middle section 23 includes several third middle regions, and an angular hollow region 231 not connected to the first surrounding hollow region 211 and the second surrounding hollow region 221 is formed between each third middle region.
  • This embodiment is the fourth implementation of the conductive interconnection film 2.
  • the middle section 23 can extend to the corresponding positions of the first battery sheet 11 and the second battery sheet 12, not just at the first battery sheet 11 and the second battery sheet. between the two battery sheets 12 .
  • the first end 21 is provided with a first surrounding hollow area 211, and the first surrounding hollow area 211 surrounds the connection area between the first end 21 and the first electrode, but does not form a closure, so as to avoid the connection between the first end 21 and the first electrode.
  • the connection area of the electrode and the second end 22 are disconnected;
  • the second end 22 is provided with a second surrounding hollow area 221, and the second surrounding hollow area 221 surrounds the connection area between the second end 22 and the second electrode, but does not form a closure, avoiding The connection area between the second terminal 22 and the second electrode is disconnected from the first terminal 21 .
  • the middle section 23 includes several third middle regions, and an angular hollow region 231 connected with the first surrounding hollow region 211 and the second surrounding hollow region 221 is formed between each third middle region.
  • This embodiment is the fifth implementation of the conductive interconnection film 2.
  • the middle section 23 can extend to the corresponding positions of the first battery sheet 11 and the second battery sheet 12, not just at the first battery sheet 11 and the second battery sheet. between the two battery sheets 12 .
  • the first end 21 and the second end 22 are provided with a surrounding hollow area, and the second end 22 is not provided with a surrounding hollow area; the first end 21 There is no surrounding hollow area, and the second end 22 is provided with a surrounding hollow area.
  • the stress can be released through the bending design around the hollow area, and the stress can also be released through the gap design of the angular hollow area 231, which can effectively solve the problem of battery power caused by cold and heat release. Stress problems caused by shrinkage and expansion.
  • the battery sheet in Embodiment 16 is provided with a first pad point and a second pad point, the first pad point is connected to the first electrode, and the first pad point is connected to the first electrode.
  • the two pads are connected to the second electrode.
  • the first pad point can collect the current of the first electrode
  • the second pad point can collect the current of the second electrode.
  • the first end 21 is conductively connected to the first electrode of the first battery slice 11 through the first pad point of the first battery slice 11, and the second end 22 is electrically connected to the first electrode of the first battery slice 11 through the first pad point.
  • the second pad point of the second battery slice 12 is conductively connected with the second electrode of the second battery slice 12 to realize the current transmission between the two battery slices.
  • the battery sheet in Embodiment 17 is provided with a first busbar and a second busbar, the first busbar is connected to the first electrode, and the first busbar is connected to the first electrode.
  • the two main gates are connected to the second electrodes.
  • the first main grid can collect the current of the first electrode
  • the second main grid can collect the current of the second electrode.
  • the first end 21 is conductively connected to the first electrode of the first battery slice 11 through the first main grid of the first battery slice 11, and the second end 22 is electrically connected to the first electrode of the first battery slice 11 through the first
  • the second main grid of the second battery slice 12 is conductively connected with the second electrode of the second battery slice 12 to realize the current transmission between the two battery slices.
  • the length of the first end 21 of the eighteenth embodiment is L1, and the width of the first end 21 is D1;
  • the length of the second end 22 is L2, and the width of the second end 22 is D2;
  • the length of the middle section 23 is L3, and the width of the middle section 23 is D3;
  • the first end 21 has a long side and a short side, the length of the first end 21 refers to the length of the long side, and the width of the first end 21 refers to the length of the short side.
  • the second end 22 has a long side and a short side, the length of the second end 22 refers to the length of the long side, and the width of the second end 22 refers to the length of the short side.
  • Middle section 23 is irregular shape, but four edge points of middle section 23 can form a rectangle, and this rectangle is provided with long side and short side, and the length of middle section 23 refers to long side length, and the width of middle section 23 refers to is the length of the short side.
  • the length L3 of the middle section 23 may be consistent with the length L1 of the first end 21 or the length L2 of the second end 22 .
  • the length of the first end 21 is set to be greater than or equal to the length of the second end 22, the width of the first end 21 is set to be greater than the width of the middle section 23, and the width of the second end 22 is set to be greater than the width of the middle section 23, in order to ensure that the current is effective While transferring, the stress and cost can be reduced as much as possible.
  • Fig. 4 on the basis of Embodiment 1 and Embodiment 2, there are several intermediate sections in the nineteenth embodiment, and the length of the intermediate section 23 along the first direction in which the solar cell strings extend is L4, the width of the middle section 23 along the second direction perpendicular to the first direction is D4;
  • L4 is less than 3cm
  • D4 is less than 3cm
  • each intermediate section 23 can be understood as each first intermediate region in the tenth embodiment.
  • Each middle section 23 is arranged in a rectangular shape, and the middle section 23 is provided with a long side and a short side.
  • the length of the middle section 23 along the first direction in which the solar cell string extends refers to the length of the long side, and the middle section 23 is vertical along the first direction.
  • the width in the second direction refers to the length of the short side.
  • L4 can be set to 0.5cm, 1cm, 1.5cm, 2cm or 2.5cm, or set to other parameter values less than 3cm
  • D4 can be set to 0.5cm, 1cm, 1.5cm, 2cm or 2.5cm, or set to less than 3cm
  • Other parameter values of 3cm Preferably, L4 and D4 are on the order of millimeters, for example, set to 0.5 to 2mm. Setting the length and width of the middle section 23 to be less than 3 cm can reduce stress and cost as much as possible while ensuring effective transmission of current from the first end 21 to the second end 22 .
  • the adjacent edge of the first cell 11 and the second cell 12 in the twentieth embodiment is the first edge 113
  • the second The distance between one end 21 and the first centerline 212 away from and parallel to the first edge 113 and the first edge 113 is L5;
  • the adjacent edge of the second battery sheet 12 and the first battery sheet 11 is the second edge 121 , and the second end 22 is at a distance from and parallel to the second center line 222 of the second edge 121 and the second edge 121 .
  • the distance of the second edge 121 is L6;
  • L5 is less than 30cm
  • L6 is less than 30cm
  • the first edge 113 is arranged in a vertical direction
  • the first centerline 212 of the first end 21 is parallel to the first edge 113, and is also arranged in a vertical direction
  • the first centerline 212 is far away from the first edge 113
  • the first The central line 212 is a vertical line located in the middle of the first end 21 .
  • the second edge 121 is arranged in a vertical direction
  • the second centerline 222 of the second end 22 is parallel to the second edge 121, and is also arranged in a vertical direction
  • the second centerline 222 is far away from the second edge 121
  • the second centerline 222 is is a vertical line at the middle position of the second end 22.
  • L5 can be set to 5 cm, 10 cm, 15 cm, 20 cm or 25 cm, or set to other parameter values less than 30 cm.
  • L6 can be set to 5cm, 10cm, 15cm, 20cm or 25cm, or set to other parameter values less than 30cm. Set L5 and L6 to be less than 30cm, while ensuring that the current of the first electrode of the first cell 11 is effectively transferred to the first end 21, and the current of the second electrode of the second cell 12 is effectively transferred to the second end 22 , can reduce stress and cost as much as possible.
  • the L5 of the twenty-first embodiment is less than 5 cm, and the L6 is less than 5 cm.
  • L5 can be set to 1cm, 2cm, 3cm or 4cm, or set to other parameter values less than 5cm.
  • L6 can be set to 1cm, 2cm, 3cm or 4cm, or set to other parameter values less than 5cm.
  • Embodiment 20 On the basis of Embodiment 20, L6 ⁇ L5 in Embodiment 22. Further reduce L5, through this arrangement, the current of the first electrode of the first cell 11 is effectively transferred to the first end 21, and the current of the second electrode of the second cell 12 is effectively transferred to the second end 22 At the same time, the stress and cost can be reduced as much as possible.
  • the cell in the twenty-third embodiment is a double-sided cell, the first end 21 is connected to the first electrode on the front of the first cell 11, and the second end 22 Connect to the second electrode located on the back of the second cell 12 .
  • the double-sided cells can be PERC cells, HJT cells or topcon cells.
  • the front of the first battery sheet 11 is the first electrode, and the back is the second electrode.
  • the front of the second battery sheet 12 is the first electrode, and the back is the second electrode.
  • the first end 21 is connected to the first electrode of the first cell 11
  • the second end 22 is connected to the second electrode of the second cell 12
  • the middle section 23 is bent to connect the first end 21 and the second end 22 .
  • each conductive interconnection film 2 is not connected to each other.
  • Each conductive interconnection film 2 is not connected to each other, which can reduce stress and cost as much as possible while ensuring effective transmission of current.
  • the conductive interconnection film 2 can be provided with 5, 10, 15, 20, 25 or 30, or be set to other parameter values between 3 and 30, which is based on the first cell sheet 11 and the second cell Depending on the size of the sheet 12. Generally speaking, the specifications of the first battery slice 11 and the second battery slice 12 are the same.
  • the conductive interconnection film 2 of the twenty-sixth embodiment is made of one or more materials of copper, silver or aluminum. Of course, other materials can also be used for the conductive interconnection film 2 , which will not be repeated here.
  • the twenty-eighth embodiment provides a solar cell assembly, and the solar cell assembly includes the solar cell string as described in the first to twenty-seventh embodiments.
  • the conductive interconnection film 2 includes a first end 21 connected to the first cell 11, a second end 22 connected to the second cell 12, and a first end 21 connected to the second end respectively.
  • the middle section 23 of 22 realizes the conductive connection between the first battery piece 11 and the second battery piece 12 through the conductive interconnection film 2, wherein the thickness of the middle section 23 is less than 500um.
  • the solar battery string realizes the conductive connection between each battery piece through the conductive interconnection film 2, without the need for a welding strip, which can avoid the problems of bending and stress concentration of the battery piece caused by the installation of the welding strip, and the conductive interconnection film 2 passes through
  • the first terminal 21 is connected to the first battery piece 11, and the second terminal 22 is connected to the second battery piece 12.
  • the coverage area is less than 50%, and it is used to connect the first terminal 21 and the second battery piece.
  • the thickness of the middle section 23 of the two ends 22 is small, which can greatly reduce the influence of the thermal expansion of the conductive material on the patterning accuracy.
  • the production capacity can be greatly reduced. Cost, for the GW capacity level, can effectively help manufacturers control costs.
  • the twenty-ninth embodiment provides a solar cell system, and the solar cell system includes the solar cell module as described in the twenty-eighth embodiment.
  • the conductive interconnection film 2 includes a first end 21 connected to the first cell 11, a second end 22 connected to the second cell 12, and a first end 21 connected to the second end respectively.
  • the middle section 23 of 22 realizes the conductive connection between the first battery piece 11 and the second battery piece 12 through the conductive interconnection film 2, wherein the thickness of the middle section 23 is less than 500um.
  • the solar battery string realizes the conductive connection between each battery piece through the conductive interconnection film 2, without the need for a welding strip, which can avoid the problems of bending and stress concentration of the battery piece caused by the installation of the welding strip, and the conductive interconnection film 2 passes through
  • the first terminal 21 is connected to the first battery piece 11, and the second terminal 22 is connected to the second battery piece 12.
  • the coverage area is less than 50%, and it is used to connect the first terminal 21 and the second battery piece.
  • the thickness of the middle section 23 of the two ends 22 is small, which can greatly reduce the influence of the thermal expansion of the conductive material on the patterning accuracy.
  • the production capacity can be greatly reduced. Cost, for the GW capacity level, can effectively help manufacturers control costs.

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Abstract

本发明属于太阳能电池技术领域，尤其涉及一种太阳能电池串、太阳能电池电池组件以及太阳能电池系统。太阳能电池串包括：至少两个电池片；分别连接第一电池片和第二电池片的导电互联膜，导电互联膜包括第一端、第二端以及分别连接第一端和第二端的中间段；第一端与第一电池片的第一电极导电连接，第二端与第二电池片的第二电极导电连接；或者，第一端与第一电池片的第一电极导电连接，第二端与第二电池片的第一电极导电连接；其中，中间段的厚度小于500um。太阳能电池串可避免发生由于设有焊带引起的电池片弯曲、应力集中的问题，能够大大降低导电材料的热膨胀对图形化精准度造成的影响，并且能够大大降低生产成本。

Description

太阳能电池串、太阳能电池电池组件以及太阳能电池系统 技术领域
本发明属于太阳能电池技术领域，尤其涉及一种太阳能电池串、太阳能电池电池组件以及太阳能电池系统。
 背景技术
太阳能电池是一种将光能转化为电能的半导体器件，较高的应用可靠性、较低的生产成本和较高的能量转化效率一直是太阳能电池工业追求的目标。在太阳能电池制备完成后，需要通过各样的互联技术将各个太阳能电池组成太阳能电池串，进而实现应用。
目前常用的太阳能电池互联技术有以下三种：①、MBB焊带方式：在电池片上设计多组pad点和汇流条，使用焊带连接每组pad点，最终通过汇流条汇流焊带上的电流与下一电池片形成串联。②、两电池间汇流焊接方式：在电池片两端设计pad点，使用结构化焊带焊接两电池片边缘pad点，形成电池片间的串联。③、一体化背板方式：在背板上覆盖图形化的金属膜，并且背板与电池片上的多组pad点或者细栅线连接，将电池片电流引出，同时电池片间通过图形化的铜膜进行串联，其中为了保证足够低的电阻损耗，金属膜需要覆盖背板面积的一半以上。
上述三种太阳能电池互联技术，均存在各种不足之处。在第一种方式和第二种方式中，需要设有焊带，焊带价格较贵，导致电池片成本较高；在电池片同一面上焊接多根焊带，而电池片另一面上未焊接焊带，导致电池片会产生弯曲情况，降低组件制作过程中的产品良率；焊带的强度较高，在设有焊带的区域应力集中，会降低电池片可靠性。在第三种方式中，需要大面积覆盖有金属膜，金属膜常采用银、铝等材料，导致电池片成本较高；金属材料的热膨胀会影响图形化对准度，容易引起断路、断路等不良后果，导致电池片的可靠性不高。
基于上述不足之处，设计一种太阳能电池串、太阳能电池电池组件以及太阳能电池系统，一直是本领域技术人员重点研究的问题之一。
 技术问题
本发明所要解决的技术问题在于，提供一种太阳能电池串，旨在解决现有太阳能电池互联技术成本高、可靠性差的技术问题。
 技术解决方案
为了解决上述技术问题，本发明提供了提供一种太阳能电池串，所述太阳能电池串包括：
至少两个电池片，各个所述电池片均包括第一电极和与所述第一电极极性相反的第二电极；
分别连接第一电池片和与所述第一电池片相邻的第二电池片的导电互联膜，所述导电互联膜包括沿所述太阳能电池串延伸方向设置的第一端、与所述第一端相对方向设置的第二端以及分别连接所述第一端和所述第二端的中间段；
所述第一端与所述第一电池片的第一电极导电连接，所述第二端与所述第二电池片的第二电极导电连接；或者，所述第一端与所述第一电池片的第一电极导电连接，所述第二端与所述第二电池片的第一电极导电连接；
其中，所述中间段的厚度小于500um。
更进一步地，所述中间段的厚度小于100um。
更进一步地，所述第一端和所述第二端的厚度均小于200um，所述中间段的厚度小于或等于50um。
更进一步地，所述中间段的厚度小于或等于所述第一端的厚度。
更进一步地，所述中间段的厚度小于或等于所述第二端的厚度。
更进一步地，所述导电互联膜的面积与所述第一电池片和第二电池片总面积的比例小于50%。
更进一步地，所述导电互联膜的面积与所述第一电池片和第二电池片总面积的比例小于或等于25%。
更进一步地，所述导电互联膜的面积与所述第一电池片和第二电池片总面积的比例小于或等于10%。
更进一步地，所述太阳能电池串还包括设置在所述导电互联膜所在区域、覆盖所述第一电池片的第二电极以及所述第二电池片的第一电极的绝缘层。
更进一步地，所述绝缘层设置在所述第一电池片的第二电极以及所述第二电池片的第一电极上。
更进一步地，所述绝缘层设置在所述导电互联膜上。
更进一步地，所述导电互联膜只覆盖所述第一电池片的第一电极以及所述第二电池片的第二电极。
更进一步地，所述中间段包括若干第一中间区，所述第一中间区呈平行设置，并且所述第一中间区的两端分别连接所述第一端和所述第二端。
更进一步地，所述中间段包括若干第二中间区，所述第二中间区呈交叉设置，并且所述第二中间区的两端分别连接所述第一端和所述第二端。
更进一步地，所述第一端和/或所述第二端设有环绕镂空区，所述环绕镂空区环绕着所述第一端与所述第一电极和/或所述第二端与所述第二电极的连接区域，但不形成闭合；所述中间段包括若干第三中间区，且各个第三中间区之间可形成与所述环绕镂空区连接和/或不连接的角形镂空区。
更进一步地，所述电池片设有第一pad点和第二pad点，所述第一pad点连接所述第一电极，所述第二pad点连接所述第二电极，所述第一端通过所述第一电池片的第一pad点与所述第一电池片的第一电极导电连接，所述第二端通过所述第二电池片的第二pad点与所述第二电池片的所述第二电极导电连接。
更进一步地，所述电池片设有第一主栅和第二主栅，所述第一主栅连接所述第一电极，所述第二主栅连接所述第二电极，所述第一端通过所述第一电池片的第一主栅与所述第一电池片的第一电极导电连接，所述第二端通过所述第二电池片的第二主栅与所述第二电池片的第二电极导电连接。
更进一步地，所述第一端的长度为L1，所述第一端的宽度为D1；
所述第二端的长度为L2，所述第二端的宽度为D2；
所述中间段的长度为L3，所述中间段的宽度为D3；
其中，L1≥L2，D1＞D3，D2＞D3。
更进一步地，所述中间段设有若干个，所述中间段沿所述太阳能电池串延伸的第一方向的长度为L4，所述中间段沿所述第一方向垂直的第二方向的宽度为D4；
其中，L4小于3cm，D4小于3cm。
更进一步地，所述第一电池片与所述第二电池片的相邻边缘为第一边缘，所述第一端在远离并平行所述第一边缘的第一中心线与所述第一边缘的距离为L5；
所述第二电池片与所述第一电池片的相邻边缘为第二边缘，所述第二端在远离并平行所述第二边缘的第二中心线与所述第二边缘的距离为L6；
其中，L5小于30cm，L6小于30cm。
更进一步地，L5小于5cm，L6小于5cm。
更进一步地，L6≥L5。
更进一步地，所述电池片为双面电池片，所述第一端连接位于第一电池片正面的第一电极，所述第二端连接位于第二电池片背面的第二电极。
更进一步地，所述导电互联膜设有多个，且各个导电互联膜彼此之间不连接。
更进一步地，所述导电互联膜设有3至30个。
更进一步地，所述导电互联膜采用铜、银或铝中的一种或多种材料。
更进一步地，所述第一电极与所述第一端之间、所述第二电极与所述第二端之间均设有导电胶或锡膏。
本发明还提供一种太阳能电池组件，所述太阳能电池组件包括如上所述的太阳能电池串。
本发明还提供一种太阳能电池系统，所述太阳能电池系统包括如上所述的太阳能电池组件。
 有益效果
本发明的有益效果在于，导电互联膜包括与第一电池片连接的第一端、与第二电池片连接的第二端和分别连接第一端、第二端的中间段，通过导电互联膜实现第一电池片和第二电池片的导电连接，其中中间段的厚度小于500um。太阳能电池串通过导电互联膜实现各个电池片之间的导电连接，无需设有焊带，则可避免发生由于设有焊带引起的电池片弯曲、应力集中的问题，并且导电互联膜通过第一端与第一电池片连接、第二端与第二电池片连接，只需小面积覆盖在各个电池片上，覆盖面积小于50%，且用于连接第一端和第二端的中间段厚度较小，能够大大降低导电材料的热膨胀对图形化精准度造成的影响，另外由于太阳能电池串未设有焊带且小面积使用导电互联膜，能够大大降低生产成本，对于GW产能级别而言，能够有效帮助生产厂家控制成本。
 附图说明
图1是本发明实施例提供的太阳能电池串的示意图；
图2是本发明实施例提供的背接触电池片的示意图；
图3是本发明实施例提供的导电互联膜的第二种可实现方式的示意图；
图4是基于图3的中间段的示意图；
图5是本发明实施例提供的导电互联膜的第三种可实现方式的示意图；
图6是本发明实施例提供的导电互联膜的第四种可实现方式的示意图；
图7是本发明实施例提供的导电互联膜的第五种可实现方式的示意图；
图8是基于图1中A部分的放大图。
 本发明的最佳实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明的太阳能电池串包括至少两个电池片和用于连接各个电池片的导电互联膜，导电互联膜包括第一端、第二端和分别连接第一端、第二端的中间段，导电互联膜通过第一端和第一电池片导电连接，通过第二端和第二电池片导电连接，实现与各个电池片之间的导电连接，其中中间段的厚度小于500um。太阳能电池串通过导电互联膜实现各个电池片之间的导电连接，无需设有焊带，则可避免发生由于设有焊带引起的电池片弯曲、应力集中的问题，并且导电互联膜通过第一端与第一电池片连接、第二端与第二电池片连接，只需小面积覆盖在各个电池片上，覆盖面积小于50%，且用于连接第一端和第二端的中间段厚度较小，能够大大降低导电材料的热膨胀对图形化精准度造成的影响，另外由于太阳能电池串未设有焊带且小面积使用导电互联膜，能够大大降低生产成本，对于GW产能级别而言，能够有效帮助生产厂家控制成本。
实施例一
参考图1，本实施例一提供一种太阳能电池串，所述太阳能电池串包括：
至少两个电池片，各个所述电池片均包括第一电极和与所述第一电极极性相反的第二电极；
分别连接第一电池片11和与所述第一电池片11相邻的第二电池片12的导电互联膜2，所述导电互联膜2包括沿所述太阳能电池串延伸方向设置的第一端21、与所述第一端21相对方向设置的第二端22以及分别连接所述第一端21和所述第二端22的中间段23；
所述第一端21与所述第一电池片11的第一电极导电连接，所述第二端22与所述第二电池片12的第二电极导电连接；或者，所述第一端21与所述第一电池片11的第一电极导电连接，所述第二端22与所述第二电池片12的第一电极导电连接；
其中，所述中间段23的厚度小于500um。
在本实施例中，太阳能电池串为至少两个电池片通过导电互联膜2导电连接一起而形成的电池串，太阳能电池串可包括两个电池片、三个电池片、四个电池片或者其他更多个数的电池片，可根据实际使用情况确定需要连接的电池片的个数。其中位于太阳能电池串两个端部的电池片定义为端部电池片，而在太阳能电池串包括两个以上电池片时，其连接在两个端部电池片之间的电池片定义为内部电池片。
电池片可以为任意类型的电池片，例如PERC电池片、HJT电池片、topcon电池片、IBC电池片等。电池片包括第一电极和与第一电极极性相反的第二电极，当第一电极为正电极时，第二电极即是负电极，当第一电极为负电极时，第二电极即是正电极。其中在电池片中，掺硼的P型区域为正电极，掺磷的N型区域为负电极。作为本发明中的可实现的一种实施例，参考图2，若电池片为IBC电池片时，第一电极111可为正电极，第二电极112可为负电极，两者接替设置在电池片上。作为本发明中的可实现的另外一种实施例，若电池片为双面电池片，例如PERC电池片、HJT电池片或者topcon电池片，第一电极设置在其中一面（例如正面），可为正电极，第二电极设置在另外一面（例如背面），可为负电极。
需要说明的是，本发明的重点在于各个电池片之间的互联方式，并非是电池片，故图1省略了电池片的细节之处（例如省略了栅线等）。
在太阳能电池串中，各个电池片通过导电互联膜2实现导电连接。在设有两个电池片时，导电互联膜2设在两个电池片之间。在设有三个电池片时，导电互联膜2设在两两电池片之间。在设有更多数量的电池片时，也是两两电池片之间设有导电互联膜2。
在此需要说明的是，上述的第一电池片11和第二电池片12是相邻关系，也就是说，对于相邻的电池片而言，一侧电池片为第一电池片11，另一侧电池片为第二电池片12。其并非对电池片进行数量限定，也就是说，并非限定电池串只设有两个电池片。并且，第一电池片11和第二电池片12可以是左右相邻，也可以是上下相邻，具体根据各个电池片的摆放而定。
具体来说，导电互联膜2包括连接第一电池片11的第一端21、连接第二电池片12的第二端22和分别连接第一端21、第二端22的中间段23，第一端21沿太阳能电池串延伸方向设置，第二端22设在第一端21相对方向。太阳能电池串延伸方向指的是太阳能电池串串联的方向，也即是太阳能电池串的摆放方向，当太阳能电池串垂直摆放时，太阳能电池串延伸方向为垂直方向，导电互联膜2的第一端21沿着垂直方向设置，当太阳能电池串水平摆放时，太阳能电池串延伸方向为水平方向，导电互联膜2的第二端22沿着水平方向设置。而导电互联膜2的第一端21沿着垂直方向设置时，第二端22设在该垂直方向的相对方向，即第一端21和第二端22所处位置满足导电互联膜2一端、另一端的位置要求。导电互联膜2的第一端21沿着水平方向设置时，第二端22设在该水平方向的相对方向，也即第一端21和第二端22所处位置满足导电互联膜2一端、另一端的位置要求。
导电互联膜2的第一端21与第一电池片11的第一电极导电连接，第二端22与第二电池片12的第二电极导电连接，第一电池片11和第二电池片12形成串联关系。当第一电池片11的第一电极为正电极时，第一电池片11的第二电极为负电极，第二电池片12的第一电极为正电极，第二电池片12的第二电极为负电极。当第一电池片11的第一电极为负电极时，第一电池片11的第二电极为正电极，第二电池片12的第一电极为负电极，第二电池片12的第二电极为正电极。
或者，导电互联膜2的第一端21与第一电池片11的第一电极导电连接，第二端22与第二电池片12的第一电极导电连接，第一电池片11和第二电池片12形成并联关系。当第一电池片11的第一电极为正电极时，第一电池片11的第二电极为负电极，第二电池片12的第一电极为正电极，第二电池片12的第二电极为负电极。当第一电池片11的第一电极为负电极时，第一电池片11的第二电极为正电极，第二电池片12的第一电极为负电极，第二电池片12的第二电极为正电极。
参考图1，作为本发明一种可实现的实施例，导电互联膜2为呈完整矩形，导电互联膜2在位于第一电池片11对应位置的为第一端21，在位于第二电池片12对应位置的为第二端22，在位于第一电池片11和第二电池片12之间位置的为中间段23。该实施例为导电互联膜2的第一种实现方式。
在第一电极和第二电极之间设有绝缘区。绝缘区可以是一种不导电的胶带或绝缘膜，也可以是其他适当的不导电屏蔽罩或盖；绝缘区可包含聚丙烯或聚乙烯等材料，且还可包含一种丙烯酸类黏结层。绝缘区夹在各第一电极和第二电极之间，通过绝缘区的绝缘作用，避免第一电极和第二电极相接触而短路。例如，在第一电池片11中，第一电池片11的第一电极和第二电极之间设有第一绝缘区；在第二电池片12中，第二电池片12的第一电极和第二电极之间设有第二绝缘区。
其中，中间段23的厚度小于500um。在本实施例中，中间段23的厚度可设为10um、50um、100um、150um、200um、250um、300um、350um或者400um，或者设为小于500um的其他参数值，但需要说明的是，中间段23不可设为0um。中间段23的厚度较小，具有一定的柔性，在保证电池片之间可靠性连接的同时，能够有效降低应力。
在此，详述本发明的太阳能电池串的其中一种制备方法：
步骤1、准备一基板，在基板上覆盖胶膜、EVA或者POE。
步骤2、将导电互联膜2贴在基板上。
步骤3、在导电互联膜2上设置导电胶或锡膏，或者，在第一电极和第二电极上设置导电胶或锡膏。
步骤4、将电池片规律性摆放在步骤3制得的基板上，并使第一电极与第二电极与相应的导电互联膜2对准，实现电池片与导电互联膜的连接。
在此，详述本发明的太阳能电池串的另外一种制备方法：
步骤1、准备一基板，在基板上覆盖胶膜、EVA或者POE。
步骤2、在导电互联膜2上设置导电胶或锡膏，或者，在第一电极和第二电极上设置导电胶或锡膏。
步骤3、规律性摆放电池片，并将导电互联膜2贴在相邻的电池片上，形成电池串。
步骤4、将步骤3制得的电池串摆放在基板上。
在本发明中，导电互联膜2包括与第一电池片11连接的第一端21、与第二电池片12连接的第二端22和分别连接第一端21、第二端22的中间段23，通过导电互联膜2实现第一电池片11和第二电池片12的导电连接，其中中间段23的厚度小于500um。太阳能电池串通过导电互联膜2实现各个电池片之间的导电连接，无需设有焊带，则可避免发生由于设有焊带引起的电池片弯曲、应力集中的问题，并且导电互联膜2通过第一端21与第一电池片11连接、第二端22与第二电池片12连接，只需小面积覆盖在各个电池片上，覆盖面积小于50%，且用于连接第一端21和第二端22的中间段23厚度较小，能够大大降低导电材料的热膨胀对图形化精准度造成的影响，另外由于太阳能电池串未设有焊带且小面积使用导电互联膜2，能够大大降低生产成本，对于GW产能级别而言，能够有效帮助生产厂家控制成本。
实施例二
在实施例一的基础上，本实施例二的所述中间段23的厚度小于100um。在本实施例中，中间段23的厚度可设为10um、20um、30um、40um、50um、60um、70um、80um或者90um，或者设为小于100um的其他参数值，但需要说明的是，中间段23不可设为0um。中间段23的厚度较小，具有一定的柔性，在保证电池片之间可靠性连接的同时，能够有效降低应力。
实施例三
在实施例二的基础上，本实施例三的所述第一端21和所述第二端22的厚度均小于200um，所述中间段23的厚度小于或等于50um。
在本实施例中，第一端21的厚度可设为20um、40um、60um、80um、100um、120um、140um、160um、180um，或者设为小于200um的其他参数值，但需要说明的是，第一端21不可设为0um。第二端22的厚度可设为20um、40um、60um、80um、100um、120um、140um、160um、180um，或者设为小于200um的其他参数值，但需要说明的是，第二端22不可设为0um。第一端21和第二端22的厚度可以相同，或者不同，其根据第一电池片11和第二电池片12的规格做相应设置。但由于一般第一电池片11和第二电池片12采用同样规格，故一般第一端21和第二端22的厚度相同。
在本实施例中，中间段23的厚度可设为5um、10um、15um、20um、25um、30um、35um、40um、45um或者50um，或者设为小于或等于50um的其他参数值，但需要说明的是，中间段23不可设为0um。
第一端21、第二端22、中间段23的厚度均较小，在保证第一电池片11和第二电池片12之间可靠性连接的同时，能够有效降低应力。
实施例四
在实施例三的基础上，本实施例四的所述中间段23的厚度小于或等于所述第一端21的厚度。由于第一端21需要连接第一电池片11的第一电极，实现第一电极的电流传递，而中间段23只需连接第一端21和第二端22，实现第一端21和第二端22之间的电流传递，故将中间段23的厚度设置为小于或等于第一端21的厚度，能够尽可能将中间段23的厚度设置为较低值，依然能够在保证电流有效传递的同时，有效降低应力。
实施例五
在实施例三的基础上，本实施例五的所述中间段23的厚度小于或等于所述第二端22的厚度。由于第二端22需要连接第二电池片12的第一电极，实现第一电极的电流传递，或者需要连接第二电池片12的第二电极，实现第二电极的电流传递，而中间段23只需连接第一端21和第二端22，实现第一端21和第二端22之间的电流传递，故将中间段23的厚度设置为小于或等于第二端22的厚度，能够尽可能将中间段23的厚度设置为较低值，依然能够在保证电流有效传递的同时，有效降低应力。
结合实施例四，较佳的实现方式是，将中间段23的厚度设置为小于或等于第一端21的厚度，且小于或等于第二端22的厚度。
实施例六
在实施例一的基础上，本实施例六的所述导电互联膜2的面积与所述第一电池片11和第二电池片12总面积的比例小于50%。
上述指的是，导电互联膜2的第一端21、第二端22和中间段23的面积之和与第一电池片11和第二电池片12面积之和的比例小于50%。若导电互联膜2设有多个，则上述指的是所有导电互联膜2的第一端21、第二端22和中间段23的面积之和。导电互联膜2通过第一端21与第一电池片11连接、第二端22与第二电池片12连接，且通过中间段23分别连接第一端21和第二端22，只需小面积覆盖在各个电池片上，覆盖面积小于50%，能够大大降低导电材料的热膨胀对图形化精准度造成的影响，且能够大大降低生产成本。
在本实施例中，上述面积比例可设为1%、10%、20%、30%、40%或者50%，或者设为小于50%的其他参数值，但需要说明的是，上述面积比例不得选为0%。
实施例七
在实施例六的基础上，本实施例七的所述导电互联膜2的面积与所述第一电池片11和第二电池片12总面积的比例小于或等于25%。
上述指的是，导电互联膜2的第一端21、第二端22和中间段23的面积之和与第一电池片11和第二电池片12面积之和的比例小于或等于25%。若导电互联膜2设有多个，则上述指的是所有导电互联膜2的第一端21、第二端22和中间段23的面积之和。导电互联膜2通过第一端21与第一电池片11连接、第二端22与第二电池片12连接，且通过中间段23分别连接第一端21和第二端22，只需小面积覆盖在各个电池片上，覆盖面积小于或等于25%，能够大大降低导电材料的热膨胀对图形化精准度造成的影响，且能够大大降低生产成本。
在本实施例中，上述面积比例可设为1%、5%、10%、15%、20%或者25%，或者设为小于或等于25%的其他参数值，但需要说明的是，上述面积比例不得选为0%。
实施例八
在实施例七的基础上，本实施例八的所述导电互联膜的面积与所述第一电池片和第二电池片总面积的比例小于或等于10%。
上述指的是，导电互联膜2的第一端21、第二端22和中间段23的面积之和与第一电池片11和第二电池片12面积之和的比例小于或等于10%。若导电互联膜2设有多个，则上述指的是所有导电互联膜2的第一端21、第二端22和中间段23的面积之和。导电互联膜2通过第一端21与第一电池片11连接、第二端22与第二电池片12连接，且通过中间段23分别连接第一端21和第二端22，只需小面积覆盖在各个电池片上，覆盖面积小于或等于10%，能够大大降低导电材料的热膨胀对图形化精准度造成的影响，且能够大大降低生产成本。
在本实施例中，上述面积比例可设为1%、3%、5%、7%或者9%，或者设为小于或等于10%的其他参数值，但需要说明的是，上述面积比例不得选为0%。
实施例九
在实施例一的基础上，本实施例九的所述太阳能电池串还包括设置在所述导电互联膜2所在区域、覆盖所述第一电池片11的第二电极以及所述第二电池片12的第一电极的绝缘层。
由于第一端21连接第一电池片11的第一电极，第二端22连接第二电池片12的第二电极，中间段23分别连接第一端21和第二端22，电流在“第一电极-第一端21-中间段23-第二端22-第二电极”之间传递，故通过设置绝缘层，能够避免第一电池片11的第一电极和第二电极连接而造成的短路，也能够避免第二电池片12的第一电极和第二电极连接而造成的短路。
实施例十
在实施例九的基础上，本实施例十的所述绝缘层设置在所述第一电池片11的第二电极以及所述第二电池片12的第一电极上。
绝缘层可以是一种不导电的胶带或绝缘膜，也可以是其他适当的不导电屏蔽罩或盖；绝缘层可包含聚丙烯或聚乙烯等材料，且还可包含一种丙烯酸类黏结层。绝缘层设置在第一电池片11的第二电极上，能够避免第一电池片11的第一电极和第二电极连接而造成的短路，绝缘层设置在第二电池片12的第一电极上，能够避免第二电池片12的第一电极和第二电极连接而造成的短路。
实施例十一
在实施例九的基础上，本实施例十一的所述绝缘层设置在所述导电互联膜2上。
在本实施例中，在导电互联膜2对应第一电池片11的第二电极的区域和对应第二电池片12的第一电极的区域设置绝缘层。绝缘层可以是一种不导电的胶带或绝缘膜，也可以是其他适当的不导电屏蔽罩或盖；绝缘层可包含聚丙烯或聚乙烯等材料，且还可包含一种丙烯酸类黏结层。通过设置绝缘层，能够避免第一电池片11的第一电极和第二电极连接而造成的短路，也能够避免第二电池片12的第一电极和第二电极连接而造成的短路。
实施例十二
在实施例一的基础上，本实施例十二的所述导电互联膜2只覆盖所述第一电池片11的第一电极以及所述第二电池片12的第二电极。
由于导电互联膜2只覆盖第一电池片11的第一电极和第二电池片12的第二电极，不覆盖第一电池片11的第二电极和第二电池片12的第一电极，故电流只在“第一电极-第一端21-中间段23-第二端22-第二电极”之间传递，第一电池片11的第一电极和第二电极未连接，第二电池片12的第一电极和第二电极也未连接，能够避免第一电池片11的第一电极和第二电极连接而造成的短路，也能够避免第二电池片12的第一电极和第二电极连接而造成的短路。
实施例十三
参考图3，在实施例一的基础上，本实施例十三的所述中间段23包括若干第一中间区，所述第一中间区呈平行设置，并且所述第一中间区的两端分别连接所述第一端21和所述第二端22。该实施例为导电互联膜2的第二种实现方式，此时中间段23可延伸到第一电池片11和第二电池片12的对应位置上，不仅仅只是位于第一电池片11和第二电池片12之间。
若干第一中间区平行设置，各个第一中间区之间位置形成镂空区，能够有效降低应力，且可以节省材料，降低成本。
实施例十四
参考图5，在实施例一的基础上，本实施例十四的所述中间段23包括若干第二中间区，所述第二中间区呈交叉设置，并且所述第二中间区的两端分别连接所述第一端21和所述第二端22。该实施例为导电互联膜2的第三种实现方式，此时中间段23可延伸到第一电池片11和第二电池片12的对应位置上，不仅仅只是位于第一电池片11和第二电池片12之间。
若干第二中间区交叉设置，使得第一电池片11和第二电池片12之间形成镂空区，能够有效降低应力，且可以节省材料，降低成本。并且，第二中间区采用斜线设计，而未采用与电池片边缘垂直的设计，可有效解决冷热释放等引起的电池电之间收缩、膨胀导致的应力问题。
实施例十五
在实施例一的基础上，本实施例十五的所述第一端21和/或所述第二端22设有环绕镂空区，所述环绕镂空区环绕着所述第一端21与所述第一电极和/或所述第二端22与所述第二电极的连接区域，但不形成闭合；所述中间段23包括若干第三中间区，且各个第三中间区之间可形成与所述环绕镂空区连接和/或不连接的角形镂空区231。
其中，环绕镂空区指的是以第一端21与第一电极的连接区域和/或第二端22与第二电极的连接区域为中心进行环绕设计的镂空区，但其存在连接区域与中间段23的连接，则该环绕镂空区需设计成不闭合的镂空区，而非闭合的镂空区。环绕镂空区可采用弯月型设计，其延伸到第一端21和/或第二端22的中心线之后。角形镂空区231可呈三角形形状。
参考图6，第一端21设有第一环绕镂空区211，第一环绕镂空区211环绕着第一端21与第一电极的连接区域，但不形成闭合，避免第一端21与第一电极的连接区域和第二端22断路；第二端22设有第二环绕镂空区221，第二环绕镂空区221环绕着第二端22与第二电极的连接区域，但不形成闭合，避免第二端22与第二电极的连接区域和第一端21断路。中间段23包括若干第三中间区，且各个第三中间区之间形成与第一环绕镂空区211、第二环绕镂空区221不连接的角形镂空区231。该实施例为导电互联膜2的第四种实现方式，此时中间段23可延伸到第一电池片11和第二电池片12的对应位置上，不仅仅只是位于第一电池片11和第二电池片12之间。
参考图7，第一端21设有第一环绕镂空区211，第一环绕镂空区211环绕着第一端21与第一电极的连接区域，但不形成闭合，避免第一端21与第一电极的连接区域和第二端22断路；第二端22设有第二环绕镂空区221，第二环绕镂空区221环绕着第二端22与第二电极的连接区域，但不形成闭合，避免第二端22与第二电极的连接区域和第一端21断路。中间段23包括若干第三中间区，且各个第三中间区之间形成与第一环绕镂空区211、第二环绕镂空区221连接的角形镂空区231。该实施例为导电互联膜2的第五种实现方式，此时中间段23可延伸到第一电池片11和第二电池片12的对应位置上，不仅仅只是位于第一电池片11和第二电池片12之间。
需要说明的是，还可实现的方式是，对于第一端21和第二端22而言，第一端21设有环绕镂空区，第二端22未设有环绕镂空区；第一端21未设有环绕镂空区，第二端22设有环绕镂空区。
在本实施例的导电互联膜2中，可通过环绕镂空区的折弯设计方式释放应力，也可通过角形镂空区231的空隙设计方式释放应力，可有效解决冷热释放等引起的电池电之间收缩、膨胀导致的应力问题。
值得一提的是，在实施例一、实施例十三、实施例十四、实施例十五的导电互联膜2各种实现方式中，可相互结合使用，即在电池片的Y轴上，可设置各种不同的导电互联膜2，进一步达到减少应力以及节省成本的目的。
实施例十六
在实施例一和实施例二的基础上，本实施例十六的所述电池片设有第一pad点和第二pad点，所述第一pad点连接所述第一电极，所述第二pad点连接所述第二电极。其中，第一pad点可收集第一电极的电流，第二pad点可收集第二电极的电流。
在本实施例中，所述第一端21通过所述第一电池片11的第一pad点与所述第一电池片11的第一电极导电连接，所述第二端22通过所述第二电池片12的第二pad点与所述第二电池片12的所述第二电极导电连接，实现两个电池片之间的电流传递。
实施例十七
在实施例一和实施例二的基础上，本实施例十七的所述电池片设有第一主栅和第二主栅，所述第一主栅连接所述第一电极，所述第二主栅连接所述第二电极。其中，第一主栅可收集第一电极的电流，第二主栅可收集第二电极的电流。
在本实施例中，所述第一端21通过所述第一电池片11的第一主栅与所述第一电池片11的第一电极导电连接，所述第二端22通过所述第二电池片12的第二主栅与所述第二电池片12的所述第二电极导电连接，实现两个电池片之间的电流传递。
实施例十八
参考图3，在实施例一和实施例二的基础上，本实施例十八的所述第一端21的长度为L1，所述第一端21的宽度为D1；
所述第二端22的长度为L2，所述第二端22的宽度为D2；
所述中间段23的长度为L3，所述中间段23的宽度为D3；
其中，L1≥L2，D1＞D3，D2＞D3。
第一端21设有长边和短边，第一端21的长度指的是长边长度，第一端21的宽度指的是短边长度。第二端22设有长边和短边，第二端22的长度指的是长边长度，第二端22的宽度指的是短边长度。中间段23为不规则形状，但中间段23的四个边缘点可形成一矩形，该矩形设有长边和短边，中间段23的长度指的是长边长度，中间段23的宽度指的是短边长度。在本实施例中，中间段23的长度L3可和第一端21的长度L1或者第二端22的长度L2相一致。
将第一端21的长度设置大于或等于第二端22的长度，第一端21的宽度设置大于中间段23的宽度，第二端22的宽度设置大于中间段23的宽度，在保证电流有效传递的同时，能够尽可能的降低应力且降低成本。
实施例十九
参考图4，在实施例一和实施例二的基础上，本实施例十九的所述中间段设有若干个，所述中间段23沿所述太阳能电池串延伸的第一方向的长度为L4，所述中间段23沿所述第一方向垂直的第二方向的宽度为D4；
其中，L4小于3cm，D4小于3cm。
在本实施例中，中间段23设有多个，而每个中间段23可理解为是实施例十的每个第一中间区。每个中间段23呈矩形设置，该中间段23设有长边和短边，中间段23沿太阳能电池串延伸的第一方向的长度指的是长边长度，中间段23沿第一方向垂直的第二方向的宽度指的是短边长度。
其中，L4可设为0.5cm、1cm、1.5cm、2cm或者2.5cm，或者设为小于3cm的其他参数值，D4可设为0.5cm、1cm、1.5cm、2cm或者2.5cm，或者设为小于3cm的其他参数值。优选地，L4和D4为毫米级别，例如设为0.5至2mm。将中间段23的长度设置为小于3cm，宽度也设置为小于3cm，在保证电流从第一端21有效传递到第二端22的同时，能够尽可能的降低应力且降低成本。
实施例二十
参考图8，在实施例一和实施例二的基础上，本实施例二十的所述第一电池片11与所述第二电池片12的相邻边缘为第一边缘113，所述第一端21在远离并平行所述第一边缘113的第一中心线212与所述第一边缘113的距离为L5；
所述第二电池片12与所述第一电池片11的相邻边缘为第二边缘121，所述第二端22在远离并平行所述第二边缘121的第二中心线222与所述第二边缘121的距离为L6；
其中，L5小于30cm，L6小于30cm。
参考图1，第一边缘113呈垂直方向设置，第一端21的第一中心线212和第一边缘113平行，也呈垂直方向设置，而第一中心线212远离第一边缘113，第一中心线212即是位于第一端21正中间位置的垂直线。第二边缘121呈垂直方向设置，第二端22的第二中心线222和第二边缘121平行，也呈垂直方向设置，而第二中心线222远离第二边缘121，第二中心线222即是位于第二端22正中间位置的垂直线。
在本实施例中，L5可设为5cm、10cm、15cm、20cm或者25cm，或者设为小于30cm的其他参数值。L6可设为5cm、10cm、15cm、20cm或者25cm，或者设为小于30cm的其他参数值。将L5和L6设置为小于30cm，在保证第一电池片11的第一电极的电流有效传递到第一端21、第二电池片12的第二电极的电流有效传递到第二端22的同时，能够尽可能的降低应力且降低成本。
实施例二十一
在实施例二十的基础上，本实施例二十一的L5小于5cm，L6小于5cm。L5可设为1cm、2cm、3cm或者4cm，或者设为小于5cm的其他参数值。L6可设为1cm、2cm、3cm或者4cm，或者设为小于5cm的其他参数值。进一步减小L5和L6，通过该设置方式，在保证第一电池片11的第一电极的电流有效传递到第一端21、第二电池片12的第二电极的电流有效传递到第二端22的同时，能够尽可能的降低应力且降低成本。
实施例二十二
在实施例二十的基础上，本实施例二十二的L6≥L5。进一步减小L5，通过该设置方式，在保证第一电池片11的第一电极的电流有效传递到第一端21、第二电池片12的第二电极的电流有效传递到第二端22的同时，能够尽可能的降低应力且降低成本。
实施例二十三
在实施例一的基础上，本实施例二十三的所述电池片为双面电池片，所述第一端21连接位于第一电池片11正面的第一电极，所述第二端22连接位于第二电池片12背面的第二电极。
其中，双面电池片可为PERC电池片、HJT电池片或者topcon电池片。第一电池片11正面的为第一电极，背面的为第二电极，第二电池片12正面的为第一电极，背面的为第二电极。第一端21连接第一电池片11的第一电极，第二端22连接第二电池片12的第二电极，中间段23呈弯曲设置，连接第一端21和第二端22。
实施例二十四
在实施例一的基础上，本实施例二十四的所述导电互联膜2设有多个，且各个导电互联膜2彼此之间不连接。各个导电互联膜2彼此之间不连接，在保证电流有效传递的同时，能够尽可能的降低应力且降低成本。
需要说明的是，上述是基于相邻的第一电池片11和第二电池片12之间的导电互联膜2，而非基于所有导电互联膜2。
实施例二十五
在实施例二十四的基础上，本实施例二十五的所述导电互联膜2设有3至30个。导电互联膜2可设有5个、10个、15个、20个、25个或者30个，或者设为3至30个之间的其他参数值，其根据第一电池片11和第二电池片12的规格而定。一般而言，第一电池片11和第二电池片12的规格相同。
需要说明的是，上述是基于相邻的第一电池片11和第二电池片12之间的导电互联膜2，而非基于所有导电互联膜2。
实施例二十六
在实施例一的基础上，本实施例二十六的所述导电互联膜2采用铜、银或铝中的一种或多种材料。当然，导电互联膜2也可采用其他材料，此处不一一赘述。
实施例二十七
在实施例一的基础上，本实施例二十七的所述第一电极与所述第一端21之间、所述第二电极与所述第二端22之间均设有导电胶或锡膏。通过导电胶或锡膏的作用，可保证第一电极与第一端21之间、第二电极与第二端22之间的有效导电。
实施例二十八
本实施例二十八提供一种太阳能电池组件，所述太阳能电池组件包括如实施例一至实施例二十七所述的太阳能电池串。
在本发明的太阳能电池串中，导电互联膜2包括与第一电池片11连接的第一端21、与第二电池片12连接的第二端22和分别连接第一端21、第二端22的中间段23，通过导电互联膜2实现第一电池片11和第二电池片12的导电连接，其中中间段23的厚度小于500um。太阳能电池串通过导电互联膜2实现各个电池片之间的导电连接，无需设有焊带，则可避免发生由于设有焊带引起的电池片弯曲、应力集中的问题，并且导电互联膜2通过第一端21与第一电池片11连接、第二端22与第二电池片12连接，只需小面积覆盖在各个电池片上，覆盖面积小于50%，且用于连接第一端21和第二端22的中间段23厚度较小，能够大大降低导电材料的热膨胀对图形化精准度造成的影响，另外由于太阳能电池串未设有焊带且小面积使用导电互联膜2，能够大大降低生产成本，对于GW产能级别而言，能够有效帮助生产厂家控制成本。
实施例二十九
本实施例二十九提供一种太阳能电池系统，所述太阳能电池系统包括如实施例二十八所述的太阳能电池组件。
在本发明的太阳能电池串中，导电互联膜2包括与第一电池片11连接的第一端21、与第二电池片12连接的第二端22和分别连接第一端21、第二端22的中间段23，通过导电互联膜2实现第一电池片11和第二电池片12的导电连接，其中中间段23的厚度小于500um。太阳能电池串通过导电互联膜2实现各个电池片之间的导电连接，无需设有焊带，则可避免发生由于设有焊带引起的电池片弯曲、应力集中的问题，并且导电互联膜2通过第一端21与第一电池片11连接、第二端22与第二电池片12连接，只需小面积覆盖在各个电池片上，覆盖面积小于50%，且用于连接第一端21和第二端22的中间段23厚度较小，能够大大降低导电材料的热膨胀对图形化精准度造成的影响，另外由于太阳能电池串未设有焊带且小面积使用导电互联膜2，能够大大降低生产成本，对于GW产能级别而言，能够有效帮助生产厂家控制成本。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (29)

  1. 一种太阳能电池串，其特征在于，所述太阳能电池串包括：
    至少两个电池片，各个所述电池片均包括第一电极和与所述第一电极极性相反的第二电极；
    分别连接第一电池片和与所述第一电池片相邻的第二电池片的导电互联膜，所述导电互联膜包括沿所述太阳能电池串延伸方向设置的第一端、与所述第一端相对方向设置的第二端以及分别连接所述第一端和所述第二端的中间段；
    所述第一端与所述第一电池片的第一电极导电连接，所述第二端与所述第二电池片的第二电极导电连接；或者，所述第一端与所述第一电池片的第一电极导电连接，所述第二端与所述第二电池片的第一电极导电连接；
    其中，所述中间段的厚度小于500um。
  2. 如权利要求1所述的太阳能电池串，其特征在于，所述中间段的厚度小于100um。
  3. 如权利要求2所述的太阳能电池串，其特征在于，所述第一端和所述第二端的厚度均小于200um，所述中间段的厚度小于或等于50um。
  4. 如权利要求3所述的太阳能电池串，其特征在于，所述中间段的厚度小于或等于所述第一端的厚度。
  5. 如权利要求3所述的太阳能电池串，其特征在于，所述中间段的厚度小于或等于所述第二端的厚度。
  6. 如权利要求1所述的太阳能电池串，其特征在于，所述导电互联膜的面积与所述第一电池片和第二电池片总面积的比例小于50%。
  7. 如权利要求6所述的太阳能电池串，其特征在于，所述导电互联膜的面积与所述第一电池片和第二电池片总面积的比例小于或等于25%。
  8. 如权利要求7所述的太阳能电池串，其特征在于，所述导电互联膜的面积与所述第一电池片和第二电池片总面积的比例小于或等于10%。
  9. 如权利要求1所述的太阳能电池串，其特征在于，所述太阳能电池串还包括设置在所述导电互联膜所在区域、覆盖所述第一电池片的第二电极以及所述第二电池片的第一电极的绝缘层。
  10. 如权利要求9所述的太阳能电池串，其特征在于，所述绝缘层设置在所述第一电池片的第二电极以及所述第二电池片的第一电极上。
  11. 如权利要求9所述的太阳能电池串，其特征在于，所述绝缘层设置在所述导电互联膜上。
  12. 如权利要求1所述的太阳能电池串，其特征在于，所述导电互联膜只覆盖所述第一电池片的第一电极以及所述第二电池片的第二电极。
  13. 如权利要求1所述的太阳能电池串，其特征在于，所述中间段包括若干第一中间区，所述第一中间区呈平行设置，并且所述第一中间区的两端分别连接所述第一端和所述第二端。
  14. 如权利要求1所述的太阳能电池串，其特征在于，所述中间段包括若干第二中间区，所述第二中间区呈交叉设置，并且所述第二中间区的两端分别连接所述第一端和所述第二端。
  15. 如权利要求1所述的太阳能电池串，其特征在于，所述第一端和/或所述第二端设有环绕镂空区，所述环绕镂空区环绕着所述第一端与所述第一电极和/或所述第二端与所述第二电极的连接区域，但不形成闭合；所述中间段包括若干第三中间区，且各个第三中间区之间可形成与所述环绕镂空区连接和/或不连接的角形镂空区。
  16. 如权利要求1或2所述的太阳能电池串，其特征在于，所述电池片设有第一pad点和第二pad点，所述第一pad点连接所述第一电极，所述第二pad点连接所述第二电极，所述第一端通过所述第一电池片的第一pad点与所述第一电池片的第一电极导电连接，所述第二端通过所述第二电池片的第二pad点与所述第二电池片的所述第二电极导电连接。
  17. 如权利要求1或2所述的太阳能电池串，其特征在于，所述电池片设有第一主栅和第二主栅，所述第一主栅连接所述第一电极，所述第二主栅连接所述第二电极，所述第一端通过所述第一电池片的第一主栅与所述第一电池片的第一电极导电连接，所述第二端通过所述第二电池片的第二主栅与所述第二电池片的第二电极导电连接。
  18. 如权利要求1或2所述的太阳能电池串，其特征在于，所述第一端的长度为L1，所述第一端的宽度为D1；
    所述第二端的长度为L2，所述第二端的宽度为D2；
    所述中间段的长度为L3，所述中间段的宽度为D3；
    其中，L1≥L2，D1＞D3，D2＞D3。
  19. 如权利要求1或2所述的太阳能电池串，其特征在于，所述中间段设有若干个，所述中间段沿所述太阳能电池串延伸的第一方向的长度为L4，所述中间段沿所述第一方向垂直的第二方向的宽度为D4；
    其中，L4小于3cm，D4小于3cm。
  20. 如权利要求1或2所述的太阳能电池串，其特征在于，所述第一电池片与所述第二电池片的相邻边缘为第一边缘，所述第一端在远离并平行所述第一边缘的第一中心线与所述第一边缘的距离为L5；
    所述第二电池片与所述第一电池片的相邻边缘为第二边缘，所述第二端在远离并平行所述第二边缘的第二中心线与所述第二边缘的距离为L6；
    其中，L5小于30cm，L6小于30cm。
  21. 如权利要求20所述的太阳能电池串，其特征在于，L5小于5cm，L6小于5cm。
  22. 如权利要求20所述的太阳能电池串，其特征在于，L6≥L5。
  23. 如权利要求1所述的太阳能电池串，其特征在于，所述电池片为双面电池片，所述第一端连接位于第一电池片正面的第一电极，所述第二端连接位于第二电池片背面的第二电极。
  24. 如权利要求1所述的太阳能电池串，其特征在于，所述导电互联膜设有多个，且各个导电互联膜彼此之间不连接。
  25. 如权利要求24所述的太阳能电池串，其特征在于，所述导电互联膜设有3至30个。
  26. 如权利要求1所述的太阳能电池串，其特征在于，所述导电互联膜采用铜、银或铝中的一种或多种材料。
  27. 如权利要求1所述的太阳能电池串，其特征在于，所述第一电极与所述第一端之间、所述第二电极与所述第二端之间均设有导电胶或锡膏。
  28. 一种太阳能电池组件，其特征在于，所述太阳能电池组件包括如权利要求1至27任一项所述的太阳能电池串。
  29. 一种太阳能电池系统，其特征在于，所述太阳能电池系统包括如权利要求28所述的太阳能电池组件。
PCT/CN2022/089863 2022-02-07 2022-04-28 太阳能电池串、太阳能电池电池组件以及太阳能电池系统 WO2023147714A1 (zh)

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