CN114613883A - Method for interconnecting battery strings and battery string interconnection structure - Google Patents
Method for interconnecting battery strings and battery string interconnection structure Download PDFInfo
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- CN114613883A CN114613883A CN202210261007.3A CN202210261007A CN114613883A CN 114613883 A CN114613883 A CN 114613883A CN 202210261007 A CN202210261007 A CN 202210261007A CN 114613883 A CN114613883 A CN 114613883A
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 38
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 34
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- 239000004332 silver Substances 0.000 claims description 34
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
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- 238000002310 reflectometry Methods 0.000 claims description 8
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- 239000000758 substrate Substances 0.000 description 23
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- 239000002245 particle Substances 0.000 description 14
- 229910052759 nickel Inorganic materials 0.000 description 10
- 238000005476 soldering Methods 0.000 description 10
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1876—Particular processes or apparatus for batch treatment of the devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/22—Spot welding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/10—Measuring as part of the manufacturing process
- H01L22/12—Measuring as part of the manufacturing process for structural parameters, e.g. thickness, line width, refractive index, temperature, warp, bond strength, defects, optical inspection, electrical measurement of structural dimensions, metallurgic measurement of diffusions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/20—Sequence of activities consisting of a plurality of measurements, corrections, marking or sorting steps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—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
- H01L31/0512—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 made of a particular material or composition of materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
A method for interconnecting battery strings and a battery string interconnection structure are provided, wherein the method for interconnecting the battery strings comprises the following steps: providing a plurality of battery strings and arranging the dry battery strings side by side, wherein the back of each battery string is provided with a welding point; providing a conductive foil connecting band, and placing the conductive foil connecting band on the back surfaces of the plurality of battery strings and opposite to the welding points; and welding the conductive foil connecting band and the welding points of the plurality of battery strings which are arranged side by side together by adopting a laser welding process. The method for interconnecting the battery strings can reduce the series resistance, the parallel resistance and the shadow area, and solve the problems of thermal stress generated between the battery strings and the connecting bands of the conductive foils and hidden cracks of the battery strings caused by welding.
Description
Technical Field
The invention relates to the field of solar cell manufacturing, in particular to a method for interconnecting cell strings and a cell string interconnection structure.
Background
Solar cells are a carrier of a novel energy utilization mode. After the solar cell is manufactured, a plurality of cell strings are connected in parallel and welded together, and then a junction box is laminated and assembled to form a cell module.
The conventional photovoltaic module has a structure that the cell strings are interconnected by soldering the bus bar and the cell strings together with a soldering iron. Along with the tendency of the cell to be flaked, the traditional soldering iron soldering mode is easy to cause the cracking or the hidden cracking, the soldering requirement of the slice is difficult to meet, in addition, the thermal stress can be generated between the cell strings and the bus bar in the soldering process, the warping problem of the welded cell strings is more easy to cause, and meanwhile, the series resistance, the parallel resistance and the shadow area among the cell strings can be increased.
Thus, the existing method of interconnecting battery strings still needs to be improved.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, the series resistance, the parallel resistance and the shadow area among the battery strings are large after the battery strings are interconnected, and the thermal stress is generated between the battery strings and a bus bar, and the battery strings are hidden and cracked due to welding.
In order to solve the above technical problem, the present invention provides a method for interconnecting battery strings, comprising: providing a plurality of battery strings and arranging the battery strings side by side, wherein the back of each battery string is provided with a plurality of rows of welding points, and the arrangement direction of each row of welding points is vertical to the direction in which the battery strings are arranged side by side; providing a conductive foil connecting band, placing the conductive foil connecting band on the back of the battery string and opposite to at least one row of the welding points; and welding the conductive foil connecting band and the welding points of the plurality of battery strings which are arranged side by side together by adopting a laser welding process.
Optionally, the thickness of the conductive foil connecting strip is 0.1mm-0.4 mm.
Optionally, the conductive foil connecting strip comprises a metal foil.
Optionally, the metal foil is an aluminum foil or a copper foil.
Optionally, the aluminum foil comprises the following components in percentage by weight: 98.3-99.25% of aluminum, 0.05-0.3% of silicon, 0.7-1.3% of iron, 0-0.05% of copper and 0-0.05% of zinc.
Optionally, the hardness of the conductive foil connecting strip is less than the hardness of the welding point.
Optionally, the conductive foil connecting strip further comprises: and the conductive coating is positioned on the surface of the metal foil, and the conductive capability of the conductive coating is greater than that of the metal foil.
Optionally, the conductive coating includes a nano conductive graphite layer, a carbon-doped silver layer, or a tin-lead alloy layer.
Optionally, the conductivity of the conductive foil connecting strip is 60% to 70%.
Optionally, the reflectivity of the conductive foil connecting strip is 90% to 99%.
Optionally, the parameters of the laser welding process include: the laser wavelength is 0.75-1000 um, the laser welding temperature is 150-250 deg.C, and the time is 10-900 ms.
Optionally, the method further includes: and before the laser welding process, pressing a part of the surface of the conductive foil connecting band by using a pressing pin.
Optionally, the pressing height of the pressing pin is 0.2mm-1 mm.
Optionally, the pressing pin is a solid pressing pin, and a pressing position of the pressing pin corresponds to the conductive foil connecting band between the welding points; or the pressing needle is a hollow pressing needle, and the pressing position of the pressing needle corresponds to the welding point.
Optionally, after the laser welding process is performed, the method further includes: and adopting an image sensor to at least collect the surface of the conductive foil connecting band corresponding to the welding point, and judging whether the false welding exists between the welding point and the conductive foil connecting band or not according to the warping degree of the surface of the conductive foil connecting band.
Optionally, the image sensor is obliquely disposed relative to the upper surface of the battery string, a connecting line from the center of the light receiving surface of the image sensor to the detected welding point is perpendicular to the extending direction of the conductive foil connecting band, and an included angle between the connecting line from the center of the light receiving surface of the image sensor to the detected welding point and the back surface of the battery string is 30 ° to 60 °.
The present invention also provides a battery string interconnection structure, including: the battery pack comprises a plurality of battery strings, a plurality of battery strings and a plurality of welding points, wherein the battery strings are arranged side by side, the back of each battery string is provided with a plurality of rows of welding points, and the arrangement direction of each row of welding points is vertical to the direction in which the battery strings are arranged side by side; and the conductive foil connecting band is positioned on the back surfaces of the battery strings which are arranged side by side and is welded with the welding points in at least one row.
Optionally, the thickness of the conductive foil connecting strip is 0.1mm-0.4 mm.
Optionally, the conductive foil connecting strip comprises a metal foil.
Optionally, the metal foil is an aluminum foil or a copper foil.
Optionally, the aluminum foil comprises the following components in percentage by weight: 98.3-99.25% of aluminum, 0.05-0.3% of silicon, 0.7-1.3% of iron, 0-0.05% of copper and 0-0.05% of zinc.
Optionally, the hardness of the conductive foil connecting strip is less than the hardness of the welding point.
Optionally, the conductive foil connecting strip further comprises: and the conductive coating is positioned on the surface of the metal foil, and the conductive capacity of the conductive coating is greater than that of the metal foil.
Optionally, the conductive coating includes a nano conductive graphite layer, a carbon-doped silver layer, or a tin-lead alloy layer.
Optionally, the conductivity of the conductive foil connecting strip is 60% to 70%.
Optionally, the reflectivity of the conductive foil connecting strip is 90% to 99%.
The technical scheme of the invention has the following advantages: according to the method for interconnecting the battery strings, provided by the invention, a plurality of rows of welding points are arranged on the back surface of each battery string, and the arrangement direction of each row of welding points is vertical to the parallel arrangement direction of the battery strings; the conducting foil connecting band is placed the back of battery cluster and with at least one line the welding point sets up relatively, adopts laser welding technology will the conducting foil connecting band with arrange side by side a plurality of battery clusters the welding point welding is in the same place, laser welding technology passes through laser radiation heating the surface of conducting foil connecting band. Because the thickness of the conductive foil connecting band is smaller, in the process of a laser welding process, heat on the surface of the conductive foil connecting band is guided to diffuse to the back surface through heat conduction, so that the conductive foil connecting band can be uniformly fused with the welding point after being melted, and finally, no protruding burr exists after the conductive foil connecting band is fused with the welding point, so that leakage current can be prevented from being generated, and the series resistance of a battery string and the parallel resistance of the whole battery string interconnection structure are reduced; meanwhile, by adopting the laser welding process, the condition of insufficient soldering of the battery string interconnection structure can be reduced, when voltage is applied to the battery string interconnection structure, the near-infrared light intensity generated in each region of the battery pieces in the battery string is consistent, the dark light spots of the formed near-infrared image are less, and the shadow area of the battery string interconnection structure is reduced; the conductive foil connecting band has good tensile strength or elongation, has good heat conduction characteristic, can well bear high temperature and cold extreme environment, can not lose performance even in the extreme environment, can not deform, melt or split, and can solve the problem of thermal stress generated between the welded battery string and the conductive foil connecting band and the problem of hidden cracking of the battery string caused by welding.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for interconnecting battery strings according to an embodiment of the present invention;
fig. 2 to fig. 4 are schematic structural diagrams of a cell string interconnection process according to an embodiment of the present invention.
In the drawings, wherein:
1-battery string, 2-welding point, 3-conductive foil connecting band, 4-laser, 5-pressing pin and 6-image sensor.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment provides a method for interconnecting battery strings, and referring to fig. 1, the method includes the following steps:
step S1: providing a plurality of battery strings and arranging the battery strings side by side, wherein the back of each battery string is provided with a plurality of rows of welding points, and the arrangement direction of each row of welding points is vertical to the direction in which the battery strings are arranged side by side;
step S2: providing a conductive foil connecting strip, placing the conductive foil connecting strip on the back of the battery string and opposite to at least one row of the welding points;
step S3: and welding the conductive foil connecting band and the welding points of the plurality of battery strings which are arranged side by side together by adopting a laser welding process.
In step S1, referring to fig. 2, a plurality of battery strings 1 are provided, the back of the battery string 1 having a welding point 2, the welding point 2 being on the back of the plurality of battery strings 1.
In one embodiment, each battery string 1 includes a plurality of battery pieces connected in series. The cells may be of various types including, but not limited to, Topcon, Perc, or HJT, or may be shingled. Taking HJT as an example, each cell includes: a semiconductor substrate layer, typically an N-type silicon wafer; a first intrinsic semiconductor layer on one side of the semiconductor substrate layer; a second intrinsic semiconductor layer on the other side of the semiconductor substrate layer; the first doped semiconductor layer, which is usually an N-type doped semiconductor layer, is positioned on one side of the first intrinsic semiconductor layer, which is far away from the semiconductor substrate layer, and forms a high-low junction with the N-type silicon wafer; the second doped semiconductor layer, which is usually a P-type doped semiconductor layer, is positioned on one side of the second intrinsic semiconductor layer, which is far away from the semiconductor substrate layer, and forms a PN junction with the N-type silicon wafer; the first transparent conductive film is positioned on one side, away from the semiconductor substrate layer, of the first doped semiconductor layer; the second transparent conductive film is positioned on one side, departing from the semiconductor substrate layer, of the second doped semiconductor layer; the first grid line electrode is positioned on one side, away from the semiconductor substrate layer, of the first transparent conductive film and comprises a first main grid and a first fine grid; and the second grid line electrode is positioned on one side of the second transparent conductive film, which is far away from the semiconductor substrate layer, and comprises a second main grid and a second fine grid.
The main grid and the fine grid arranged on the cell slice are mainly used for leading out the current formed by the PN junction (and the high-low junction) by the transparent conductive film. The main grids are parallel to each other, the fine grids are parallel to each other, the number of the main grids is more than that of the fine grids, and the arrangement directions of the main grids and the fine grids are perpendicular to each other. When the battery strings are connected with each other, the main grids of the adjacent battery pieces are electrically connected with each other; the plurality of solder points are arranged in a direction perpendicular to the main gate. In a specific embodiment, the welding point 2 is located between adjacent first fine grids of each cell or the welding point 2 is located between adjacent second fine grids of each cell according to the arrangement of the cells towards the solar surface.
The soldering points 2 are made by screen printing in the process stage of preparing the battery piece. The slurry adopted by the welding point 2 can be silver paste with the mass ratio of 65-90% of silver; the slurry adopted by the welding point 2 can also be silver paste with the mass ratio of silver of 15% -35%, the silver paste is doped with a plurality of particles, and the particles can be silver-coated nickel particles, silver-coated copper particles or silver-coated aluminum particles; the silver paste can be silver paste with the mass ratio of 50-75% of silver, the silver paste is doped with silver-coated glass particles, the nickel paste with the mass ratio of 60-75% of nickel can be doped with nickel-coated carbon particles.
The number of welding points 2 on each cell in the battery string 1 can be increased or decreased according to actual needs.
With reference to fig. 2, the plurality of battery strings 1 are arranged side by side, specifically, the plurality of battery strings 1 are arranged side by side on the substrate, and the back of the battery faces upward when the battery is arranged. The substrate may be a high light transmittance glass substrate.
In step S2, with continued reference to fig. 2, a conductive foil connecting strip is provided, which is placed on the back of the plurality of battery strings 1 and is disposed opposite to the welding points 2.
In one embodiment, the thickness of the conductive foil connecting strip 3 is 0.1mm-0.4mm, e.g. 0.3 mm; if the thickness of the conductive foil connecting band 3 is less than 0.1mm, the conductive foil connecting band 3 is too small in thickness, so that the conductive foil connecting band 3 is wrinkled during welding; if the thickness of conducting foil connecting band 3 is greater than 0.4mm, then the thickness of conducting foil connecting band 3 is too big, can lead to the laser to wear not to pass thoroughly when later adopting laser welding technology conducting foil connecting band 3 makes conducting foil connecting band 3 with the welding point is difficult for obtaining better welding effect.
Will conductive foil connecting band 3 with before welding of welding point 2, conductive foil connecting band 3 is preferred to be through annealing treatment, conductive foil connecting band 3 can eliminate and improve the inside tissue defect and the internal stress of leaving behind of conductive foil connecting band 3 through annealing treatment. Conductive foil connecting band 3 includes metal foil, metal foil has good tensile strength or percentage elongation, and has good heat-conduction characteristic, can bear high temperature and chilly extreme environment well, even can not lose the performance in extreme environment, the condition that can not appear warping, melting or split to guarantee battery pack's quality.
The metal foil is an aluminum foil or a copper foil. In this embodiment, the metal foil is an aluminum foil, and the aluminum foil has an oxidation protection film, is soft in texture, is favorable for adhesion, is mature in manufacturing technology, is relatively low in price, and the like.
In this embodiment, the aluminum foil comprises the following components: 98.3-99.25% of aluminum, 0.05-0.3% of silicon, 0.7-1.3% of iron, 0-0.05% of copper and 0-0.05% of zinc. The component content of the aluminum foil can increase the conductivity of the aluminum foil, can also increase the toughness of the aluminum foil and prevent the aluminum foil from wrinkling.
In other embodiments, the composition of the aluminum foil may also be other values.
In another embodiment, the conductive foil connection strip 3 further comprises: the conductive coating is positioned on the surface of the metal foil, and the conductive capacity of the conductive coating is greater than that of the metal foil; the conductive coating comprises a nano conductive graphite layer, a carbon-doped silver layer or a tin-lead alloy layer.
In one embodiment, the tin-lead alloy includes 60% tin and 40% lead (Sn)60Pb40)。
Specifically, the nano conductive graphite layer, the carbon-doped silver layer or the tin-lead alloy layer are uniformly and finely coated on the surface of the metal foil, the conductive coating can provide excellent static conductive performance, and micro-current of active substances is collected, so that the contact resistance between materials and current collection can be greatly reduced, the adhesion capability between the metal foil and the welding point can be improved, the usage amount of a binder in the conductive coating can be reduced, and the binder can play a role in auxiliary lubrication.
The hardness of the conductive foil connecting band 3 is smaller than that of the welding point 2, so that the conductive foil connecting band 3 and the welding point 2 are easily welded together in the welding process.
In one embodiment, the conductive foil connecting strip 3 has a conductivity of 60% to 70%.
In an embodiment, the reflectivity of the conductive foil connection strip 3 is 90% to 99%, and the conductive foil connection strip 3 reflects 90% to 99% of light and infrared rays, and can enhance the reflection of light in the battery string 1 to increase the optical path of light, thereby achieving the effect of increasing the power of the battery string.
In a specific example, an aluminum foil having a conductivity of 64.94%, a reflectivity of 98%, and a density of 2.7g/cm was used3The melting point was 660 ℃, the resistivity was 26.5 n.OMEGA.m, and the thermal conductivity was 235W/(m.K).
The density of the aluminum foil used in this example was 2.7g/cm3And density of copper: 8.96g/cm3Density of iron: 7.86g/cm3The conductive foil connecting tape finally formed from the aluminum foil is lighter in weight than the aluminum foil, which has a lower density. And (3) placing the conductive foil connecting band 3 on the back of the plurality of battery strings 1 and before the conductive foil connecting band is arranged opposite to the welding point 2, straightening the conductive foil connecting band 3, and cutting the conductive foil connecting band into a specified length.
In this embodiment, the laser welding device is preferably a multifunctional machine, and can be compatible with different materials, integrate the straightening and cutting functions of the conductive foil connecting band with different thicknesses, lengths and widths, and record the use condition of the conductive foil connecting band and have the alarm function. Of course, in other embodiments, other laser welding equipment may be used.
In step S3, the parameters of the laser welding process include: the wavelength of the adopted laser 4 is 0.75-1000 μm, the laser welding temperature is 150-250 ℃, and the time is 10-900 ms. The laser 4 is adapted to heat the foil connection strip 3 such that the foil connection strip 3 is welded to the welding point 2, in one embodiment the means for emitting the laser 4 comprises an infrared laser.
Specifically, the laser system automatically judges and finely adjusts the laser focus, so that the welding point 2 is in the focal plane of the scanning laser system, the conductive foil connecting band 3 is welded to the welding point 2 by using a single kilowatt infrared continuous wave laser, and the conductive foil connecting band 3 and the welding point 2 form a metal-metal interface, so that the conductivity can be improved.
The method for interconnecting the battery strings further comprises the following steps: before the laser welding process is carried out, a pressing pin 5 is adopted to press part of the conductive foil connecting band 3, the pressing pin 5 is mainly suitable for fixing the conductive foil connecting band 3, the shape of the pressing pin 5 can be adjusted according to the size of the welding point 2 and the width of the conductive foil connecting band 3, and the pressing pin 5 is made of a heat-resistant material and is not hard in texture.
In an embodiment the pressing height of said pressing pins 5, i.e. the pressing height of the conductive foil connecting strips 3 with respect to the initial state of the conductive foil connecting strips 3, is 0.2mm-1mm, said pressing height being the height at which said conductive foil connecting strips 3 are not pressed by said pressing pins 5 after being pressed by said pressing pins 5. If the pressing height of the pressing pin 5 is less than 0.2mm, the conductive foil connecting band 3 and the welding point 2 cannot be well fixed; if the pressing height of the pressing pin 5 is greater than 1mm, the battery string 1 may be damaged by pressing.
In one embodiment, the pressing pin 5 is a solid pressing pin, the pressing position of the pressing pin 5 corresponds to the position of the conductive foil connecting strip 3 between the welding points 2, and the laser 4 directly irradiates the position of the conductive foil connecting strip 3 between a plurality of welding points 2.
In the present embodiment, referring to fig. 3 and 4 in combination, the pressing pin 5 is a hollow pressing pin, and the pressing position of the pressing pin 5 corresponds to the welding point 2. The hollow pressing needle comprises a needle cylinder area and a hollow area surrounded by the needle cylinder area, the section shape of the needle cylinder area is circular ring-shaped, the section shape of the hollow area is circular, and the needle cylinder area and the hollow area are nested concentrically. When the laser welding process is adopted, the laser 4 is irradiated on the conductive foil connecting strip at the position corresponding to the welding point 2 through the hollow area.
Referring to fig. 4, the method for interconnecting the battery strings further includes: after the laser welding process is carried out, the method further comprises the following steps: adopting an image sensor 6 to at least collect the surfaces of the conductive foil connecting bands corresponding to the welding points, and judging whether the false welding exists between the welding points 2 and the conductive foil connecting bands 3 according to the warping degree of the surfaces of the conductive foil connecting bands 3; the image sensor 6 is placed obliquely with respect to the upper surface of the battery string, and the oblique placement makes it easier to obtain an overall view of the surface of the conductive foil connecting band 3 on the soldering point 2. A connecting line from the center of the light receiving surface of the image sensor 6 to the detected welding point 2 is perpendicular to the extending direction of the conductive foil connecting band 3, and an included angle between the connecting line from the center of the light receiving surface of the image sensor 6 to the detected welding point 2 and the back surface of the battery string 1 is 30-60 degrees; the angle is an acute included angle between the laser emitted by the image sensor 6 and the horizontal plane of the conductive foil connecting band 3.
If the cold joint exists, re-welding the welding point 2 and the conductive foil connecting band 3 by adopting a laser welding process; and if no cold joint exists, the welding is finished.
In one embodiment, a part of the conductive foil connecting band of the battery string interconnection structure is used as a positive electrode, a part of the conductive foil connecting band of the battery string interconnection structure is used as a negative electrode, and the battery string interconnection structure further comprises a first lead, one end of which is connected with the positive electrode; one end of the second lead is connected with the negative electrode; the back of the battery string interconnection structure is also provided with a plurality of jumper wires, such as: the first jumper wire and the second jumper wire are arranged in the direction perpendicular to the conductive foil connecting band, and the third jumper wire is arranged in the direction parallel to the conductive foil connecting band; the battery string interconnection structure further includes: a first diode, a second diode and a third diode; the other end of the first lead is connected with the anode of the first diode, the cathode of the first diode is connected with one end of the first jumper, the other end of the first jumper is connected with the third jumper, the cathode of the first diode is also connected with the anode of the second diode, the cathode of the second diode is connected with one end of the second jumper, the other end of the second jumper is connected with the anode of the third diode, and the cathode of the third diode is connected with the other end of the second lead.
The welding points 2 are arranged at intervals with the projection of the jumper on the semiconductor substrate layer.
The present embodiment further provides a battery string interconnection structure, referring to fig. 2, including:
the battery pack comprises a plurality of battery strings 1, wherein the battery strings 1 are arranged side by side, the back surface of each battery string 1 is provided with a plurality of rows of welding points 2, and the arrangement direction of each row of welding points 2 is vertical to the direction in which the battery strings 1 are arranged side by side;
and the conductive foil connecting band 3 is positioned on the back of the battery string 1 which is arranged side by side and is welded with the welding points 2 in at least one row.
In one embodiment, each battery string 1 includes a plurality of battery pieces connected in series, and each battery piece includes: a semiconductor substrate layer; a first intrinsic semiconductor layer on one side of the semiconductor substrate layer; a second intrinsic semiconductor layer on the other side of the semiconductor substrate layer; the first doped semiconductor layer is positioned on one side, away from the semiconductor substrate layer, of the first intrinsic semiconductor layer; the second doped semiconductor layer is positioned on one side, away from the semiconductor substrate layer, of the second intrinsic semiconductor layer, and back to the semiconductor substrate layer; the first transparent conductive film is positioned on one side, away from the semiconductor substrate layer, of the first doped semiconductor layer; the second transparent conductive film is positioned on one side, away from the semiconductor substrate layer, of the second doped semiconductor layer; the first grid line electrode is positioned on one side, away from the semiconductor substrate layer, of the first transparent conductive film and comprises a first main grid and a first fine grid; and the second grid line electrode is positioned on one side of the second transparent conductive film, which is far away from the semiconductor substrate layer, and comprises a second main grid and a second fine grid.
In a specific embodiment, the welding point 2 is located between adjacent first fine grids, or the welding point 2 is located between adjacent second fine grids.
The soldering points 2 are made by screen printing in the process stage of preparing the battery piece. The slurry adopted by the welding point 2 can be silver paste with the mass ratio of 65-90% of silver; the slurry adopted by the welding point 2 can also be silver paste with the mass ratio of silver of 15-35%, the silver paste is doped with a plurality of particles, and the particles can be silver-coated nickel particles, silver-coated copper particles or silver-coated aluminum particles; the silver paste can also be silver paste with the mass ratio of 50% -75% of silver, the silver paste is doped with silver-coated glass particles, and the nickel paste can also be nickel paste with the mass ratio of 60% -75% of nickel, and the nickel paste is doped with nickel-coated carbon particles.
In one embodiment, the thickness of the conductive foil connecting strip 3 is 0.1mm-0.4mm, e.g. 0.3 mm; if the thickness of the conductive foil connecting band 3 is less than 0.1mm, the conductive foil connecting band 3 is too small in thickness, so that the conductive foil connecting band 3 is wrinkled during welding; if the thickness of conducting foil connecting band 3 is greater than 0.4mm, then the thickness of conducting foil connecting band 3 is too big, can lead to the laser not to pass when later adopting laser welding technology conducting foil connecting band 3 makes conducting foil connecting band 3 with welding point 2 is difficult for the welding.
Conductive foil connecting band 3 is the state after annealing, the tissue defect and the internal stress of leaving over in the process before can be eliminated and improved to 3 annealing of conductive foil connecting band, conductive foil connecting band 3 includes the metal foil, the metal foil has good tensile strength or percentage elongation, and has good heat-conduction characteristic, can bear high temperature and chilly extreme environment well, even can not lose the performance in extreme environment, the condition of deformation, melting or splitting can not appear.
The metal foil is an aluminum foil or a copper foil, and in the embodiment, the metal foil is an aluminum foil which has the advantages of being provided with an oxidation protection film, soft in texture, beneficial to bonding, mature in manufacturing technology, relatively low in price and the like.
In this embodiment, the aluminum foil comprises the following components: 98.3-99.25% of aluminum, 0.05-0.3% of silicon, 0.7-1.3% of iron, 0-0.05% of copper and 0-0.05% of zinc. The component content of the aluminum foil can increase the conductivity of the aluminum foil, can also increase the toughness of the aluminum foil and prevent the aluminum foil from wrinkling.
In other embodiments, the composition of the aluminum foil may also be other values.
In another embodiment, the conductive foil connection strip 3 further comprises: the conductive coating is positioned on the surface of the metal foil, and the conductive capacity of the conductive coating is greater than that of the metal foil; the conductive coating comprises a nano-conductive graphite layer, a carbon-doped silver layer, or a tin-lead alloy, for example, the tin-lead alloy comprises 60% tin and 40% lead (Sn)60Pb40)。
Specifically, the nano conductive graphite layer, the carbon-doped silver layer or the tin-lead alloy are uniformly and finely coated on the surface of the metal foil, and the conductive coating can provide excellent static conductive performance and collect micro-current of active substances, so that the contact resistance between the material and the current collection can be greatly reduced, the adhesion capability between the material and the current collection can be improved, and the usage amount of a binder can be reduced.
The hardness of the conductive foil connecting band 3 is smaller than that of the welding point 2, so that the conductive foil connecting band 3 and the welding point 2 are easily welded together in the welding process.
In one embodiment, the conductive foil connecting strip 3 has a conductivity of 60% to 70%.
In one embodiment, the reflectivity of the conductive foil connecting strip 3 is 90% -99%. The conductive foil connecting band 3 can reflect 90% -99% of light and infrared rays, and can enhance the reflection of the light in the battery string 1 and increase the optical path of the light, so that the effect of increasing the power of the battery string is achieved.
In a specific example, an aluminum foil having a conductivity of 64.94%, a reflectivity of 98%, and a density of 2.7g/cm was used3The melting point was 660 ℃, the resistivity was 26.5 n.OMEGA.m, and the thermal conductivity was 235W/(m.K).
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.
Claims (10)
1. A method of cell string interconnection, comprising:
providing a plurality of battery strings and arranging the battery strings side by side, wherein the back of each battery string is provided with a plurality of rows of welding points, and the arrangement direction of each row of welding points is vertical to the direction in which the battery strings are arranged side by side;
providing a conductive foil connecting strip, placing the conductive foil connecting strip on the back of the battery string and opposite to at least one row of the welding points;
and welding the conductive foil connecting band and the welding points of the plurality of battery strings which are arranged side by side together by adopting a laser welding process.
2. The method of cell string interconnection of claim 1, wherein the conductive foil connecting strip has a thickness of 0.1mm to 0.4 mm;
preferably, the conductive foil connecting tape comprises a metal foil;
preferably, the metal foil is an aluminum foil or a copper foil;
preferably, the aluminum foil comprises the following components in percentage by weight: 98.3-99.25% of aluminum, 0.05-0.3% of silicon, 0.7-1.3% of iron, 0-0.05% of copper and 0-0.05% of zinc;
preferably, the hardness of the conductive foil connecting tape is smaller than the hardness of the welding point.
3. The method of cell string interconnection of claim 2, wherein the conductive foil connection tape further comprises: the conductive coating is positioned on the surface of the metal foil, and the conductive capacity of the conductive coating is greater than that of the metal foil;
preferably, the conductive coating comprises a nano conductive graphite layer, a carbon-doped silver layer or a tin-lead alloy layer;
preferably, the conductivity of the conductive foil connecting band is 60% -70%;
preferably, the reflectivity of the conductive foil connecting strip is 90% -99%.
4. The method of claim 1, wherein the parameters of the laser welding process comprise: the laser wavelength is 0.75-1000 um, the laser welding temperature is 150-250 deg.C, and the time is 10-900 ms.
5. The method of interconnecting battery strings according to any of claims 1-4, further comprising: before the laser welding process is carried out, a pressing pin is adopted to press part of the surface of the conductive foil connecting band;
preferably, the pressing height of the pressing pin is 0.2mm-1 mm.
6. The method of claim 5, wherein the pressing pins are solid pressing pins, and the pressing positions of the pressing pins correspond to the conductive foil connecting bands between the welding points; or the pressing needle is a hollow pressing needle, and the pressing position of the pressing needle corresponds to the welding point.
7. The method of interconnecting battery strings according to any of claims 1-4, further comprising, after performing the laser welding process: adopting an image sensor to at least collect the surface of the conductive foil connecting band corresponding to the welding point, and judging whether a cold joint exists between the welding point and the conductive foil connecting band according to the warping degree of the surface of the conductive foil connecting band;
preferably, the image sensor is obliquely arranged relative to the upper surface of the battery string, a connecting line from the center of the light receiving surface of the image sensor to the detected welding point is perpendicular to the extending direction of the conductive foil connecting band, and an included angle between the connecting line from the center of the light receiving surface of the image sensor to the detected welding point and the back surface of the battery string is 30-60 degrees.
8. A battery string interconnection structure, comprising:
the battery pack comprises a plurality of battery strings, a plurality of battery strings and a plurality of welding points, wherein the battery strings are arranged side by side, the back of each battery string is provided with a plurality of rows of welding points, and the arrangement direction of each row of welding points is vertical to the direction in which the battery strings are arranged side by side;
and the conductive foil connecting band is positioned on the back surfaces of the battery strings which are arranged side by side and is welded with the welding points in at least one row.
9. The battery string interconnection structure of claim 8, wherein the conductive foil connecting strap has a thickness of 0.1mm to 0.4 mm;
preferably, the conductive foil connecting tape comprises a metal foil;
preferably, the metal foil is an aluminum foil or a copper foil;
preferably, the aluminum foil comprises the following components in percentage by weight: 98.3-99.25% of aluminum, 0.05-0.3% of silicon, 0.7-1.3% of iron, 0-0.05% of copper and 0-0.05% of zinc;
preferably, the hardness of the conductive foil connecting tape is smaller than that of the welding point.
10. The battery string interconnection structure of claim 9, wherein the conductive foil connection strap further comprises: the conductive coating is positioned on the surface of the metal foil, and the conductive capacity of the conductive coating is greater than that of the metal foil;
preferably, the conductive coating comprises a nano conductive graphite layer, a carbon-doped silver layer or a tin-lead alloy layer;
preferably, the conductivity of the conductive foil connecting strip is 60% -70%;
preferably, the reflectivity of the conductive foil connecting strip is 90% -99%.
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