CN221041145U - Photovoltaic module - Google Patents
Photovoltaic module Download PDFInfo
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- CN221041145U CN221041145U CN202322552171.2U CN202322552171U CN221041145U CN 221041145 U CN221041145 U CN 221041145U CN 202322552171 U CN202322552171 U CN 202322552171U CN 221041145 U CN221041145 U CN 221041145U
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- insulating strip
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- 239000004698 Polyethylene Substances 0.000 claims description 10
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- QPKOBORKPHRBPS-UHFFFAOYSA-N bis(2-hydroxyethyl) terephthalate Chemical compound OCCOC(=O)C1=CC=C(C(=O)OCCO)C=C1 QPKOBORKPHRBPS-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
Landscapes
- Photovoltaic Devices (AREA)
Abstract
The utility model discloses a photovoltaic module, and relates to the technical field of photovoltaic power generation. Wherein the cell layer of the photovoltaic module comprises: the plurality of battery strings, the jumper wire, the diode and the insulating strip, wherein the jumper wire is positioned between the adjacent battery strings along the second direction, one end of the jumper wire is electrically connected with the series connection point, and the other end of the jumper wire is electrically connected with the diode; the two side edges of the jumper wire along the second direction are respectively overlapped with the edges of the battery plates of two adjacent battery strings along the second direction, and the jumper wire is not overlapped with the end conductive connecting strips of the two adjacent battery strings along the second direction; the insulating strip is arranged between the battery piece and the jumper wire. The utility model can properly reduce the string spacing between two adjacent battery strings, and improves the effective power generation area on the premise of unchanged overall size of the photovoltaic module; meanwhile, the situation that stress concentration is generated in the jumper wire coverage area in the lamination process of the photovoltaic module is reduced, and then the phenomenon of battery piece fragments or hidden cracks is avoided.
Description
Technical Field
The utility model relates to the technical field of photovoltaic power generation, in particular to a photovoltaic module.
Background
In the photovoltaic system, the photovoltaic cell is easily affected by local shadows formed in surrounding buildings and the like, so that the power generation efficiency of the photovoltaic system is reduced, and meanwhile, the photovoltaic cell affected by the shadows may also have a 'hot spot effect' due to local overheating. The aging process of the photovoltaic cell can be accelerated, the service life of the photovoltaic system is shortened, the photovoltaic cell can be burnt out when serious, and the safety of the photovoltaic system is affected.
In order to reduce negative effects of local shadows on the power generation efficiency and safety of a photovoltaic system, the most main measure adopted at present is to configure diodes in the photovoltaic module through jumpers. After the jumper wire is arranged in the photovoltaic module, the string interval between adjacent battery strings is increased, and the effective power generation area is reduced.
Disclosure of utility model
The applicant believes that when the jumper wire is arranged in the photovoltaic module, if the effective power generation area of the photovoltaic module is required to be increased, the jumper wire and the battery piece are required to be overlapped, however, the jumper wire has a certain thickness, after the jumper wire is overlapped with the battery piece, the problem that the battery piece is prone to being hidden and cracked in the lamination process of the photovoltaic module is solved, and the yield of the photovoltaic module is reduced. Based on the above situation, the utility model provides the photovoltaic module, so that the effective power generation area of the photovoltaic module is increased, the hidden cracking phenomenon of the battery piece is reduced, and the yield of the photovoltaic module is improved.
In order to achieve the above object, the present utility model provides the following technical solutions:
The utility model provides a photovoltaic module, includes front bezel, first glued membrane layer, battery piece layer, second glued membrane layer and backplate that stacks gradually, and the battery piece layer includes:
The battery strings comprise a plurality of battery pieces which are arranged along a first direction, two adjacent battery pieces are electrically connected through a plurality of conductive connecting strips which are arranged along a second direction, and the conductive connecting strips which are positioned at the side along the second direction are end conductive connecting strips;
The battery strings comprise a plurality of first battery strings and second battery strings, the two first battery strings are connected in series through a string connection point to form a first string group, the two second battery strings are connected in series through a string connection point to form a second string group, and the first string group and the second string group are arranged along a first direction and are connected in parallel to form a battery module;
The jumper wire and the diode are positioned between the adjacent battery strings along the second direction, one end of the jumper wire is electrically connected with the series connection point, and the other end of the jumper wire is electrically connected with the diode; the two side edges of the jumper wire along the second direction are respectively overlapped with the edges of the battery plates of two adjacent battery strings along the second direction, and the jumper wire is not overlapped with the end conductive connecting strips of the two adjacent battery strings along the second direction;
And the insulating strips are arranged between the battery pieces and the jumper wires, and the two side edges of the insulating strips along the second direction exceed the two side edges of the jumper wires.
When the photovoltaic module provided by the utility model is adopted, as the jumper wire is arranged in the battery string group, one end of the jumper wire is electrically connected with the serial connection point between the adjacent battery strings, and the other end of the jumper wire is electrically connected with the diode, the battery strings are reversely connected with the diode in parallel, when the battery pieces in the photovoltaic module generate hot spot effect, the diode adjacent to the battery pieces can have a bypass effect on the battery pieces, and the current generated by the rest battery pieces of the battery strings can be led out through the jumper wire and finally can be smoothly led out through the positive electrode leading-out end and the negative electrode leading-out end of the photovoltaic module, so that the influence of the hot spot phenomenon on the photovoltaic module is reduced.
In addition, as the two side edges of the jumper wire along the second direction are respectively overlapped with the edges of the battery sheets of the two adjacent battery strings along the second direction, and the jumper wire is not overlapped with the end conductive connecting strips of the two adjacent battery strings along the second direction, the arrangement is that compared with the prior art that the jumper wire is not overlapped with the battery sheets of the battery strings, the jumper wire is completely positioned in the gap of the adjacent battery strings, the string interval of the two adjacent battery strings along the second direction can be properly reduced, and therefore, the effective power generation area is improved on the premise that the overall size of the photovoltaic module is unchanged; meanwhile, the situation that stress concentration is generated in the jumper wire coverage area in the lamination process of the photovoltaic module is reduced, and then the phenomenon of battery piece fragments or hidden cracks is avoided.
In one implementation, in the second direction, both side edges of the insulating strip extend beyond the end conductive connection strips of two adjacent battery strings in the second direction.
Because the length of the jumper wire is longer, in the lamination process, the jumper wire can shift or incline, and the jumper wire is locally adjacent to or exceeds the edge of the insulating strip, so that the risk of short circuit between the jumper wire and the end conductive connecting strip is increased.
In one implementation, in the second direction, the two side edges of the insulating strip extend beyond and do not overlap the end conductive connection strips of two adjacent battery strings in the second direction.
By adopting the technical scheme, along the second direction, the insulating strips cover the end conductive connecting strips of the two adjacent battery strings and do not exceed the conductive connecting strips adjacent to the end conductive connecting strips, so that the insulating strips are ensured to isolate the jumper wire from the battery piece and the end conductive connecting strips, the width of the insulating strips is properly reduced while the jumper wire is prevented from being short-circuited, and the insulating strip material is saved; in addition, to the double-sided battery, the back of the double-sided battery can be prevented from being excessively shielded to influence the power generation efficiency, and meanwhile, the attractiveness of the double-glass assembly is improved.
In one implementation, along the second direction, the widths of the overlapping areas of the two side edges of the jumper wire and the battery string are respectively a first width and a second width;
The first width is smaller than the second width, and the first width/the second width is less than or equal to 50%; or, the second width is smaller than the first width, and the second width/the first width is less than or equal to 50%. During lamination and welding, due to operation errors and ductility of the jumper wire, the position of the jumper wire may be shifted, so that the overlapping width difference between the two side edges of the jumper wire and the battery piece is large. When only the jumper wire and the insulating strip are arranged in the battery string gap in the lamination process, if the difference of the overlapping widths of the two side edges of the jumper wire and the battery piece is large, the situation that the stress of the edge of the battery piece is concentrated can be caused, and the battery piece is easy to chip or crack. Based on the above-mentioned circumstances, make the both sides edge of wire jumper and battery cluster overlap region's width keep in reasonable within range in this scheme, prevent that the wire jumper position from taking place serious skew, make wire jumper both sides edge and battery piece overlap width difference less, reduced the condition that battery piece edge stress concentrated, and then reduced battery piece and hidden crack's probability.
In one implementation, the jumper has a width in the second direction of 3mm-8mm. When the width of the jumper wire is larger than 8mm, the jumper wire can be overlapped with the conductive connecting strip of the battery string, the thickness of the overlapped position of the jumper wire and the conductive connecting strip is thicker, stress concentration is easy to occur, and the phenomenon of battery piece fragments or hidden cracks is easy to occur; when the jumper width is less than 3mm, the resistance of the jumper is obviously increased, which can lead to larger current loss. In view of the above, the width of the jumper in the second direction is set within a reasonable range of 3mm-8mm, so that the current loss of the jumper is reduced while the phenomena of fragments or hidden cracks of the battery pieces are reduced.
And/or the width of the insulating strip along the second direction is 10mm-30mm; because the jumper length is longer, the jumper wire is very easy to take place the position offset in the photovoltaic module lamination process, and when insulating strip width was less than 10mm, the distance that insulating strip's both sides edge exceeded the both sides edge of jumper wire was less, and the jumper wire can the position offset to insulating strip outside, leads to the jumper wire of skew to contact with battery piece or conductive connection strip, and the risk of taking place the short circuit is higher. When the width of the insulating strip is greater than 30mm, waste of the insulating strip material may be caused. In view of the above, in this embodiment, the width of the insulating strip is set within a reasonable range of 10mm-30mm, so as to prevent the jumper from moving to the outer side of the insulating strip when the jumper is shifted, and save the insulating strip material more while reducing the risk of short circuit of the jumper.
And/or, in the second direction, the width of the insulating strip is 5mm-20mm greater than the width of the jumper. So can guarantee that the both sides edge of insulating strip surpasses the distance of wire jumper both sides edge and can not be too little, and then can prevent photovoltaic module lamination in-process, wire jumper position offset to the insulating strip outside, reduced the short circuit risk, also made the width of insulating strip can not be too wide simultaneously, avoided the waste of insulating strip material.
In one implementation, in the battery module, the jumper between the two first battery strings and the jumper between the two second battery strings are mutually independent, so that the length of the jumper along the first direction is shorter, and the jumper position is not easy to deviate in the lamination process. Or, the jumper wire between the two first battery strings and the jumper wire between the two second battery strings are welded or are of an integrated structure, so that the jumper wire is more convenient to process and manufacture.
The jumper wires between the two first battery strings and the jumper wires between the two second battery strings are electrically connected with the same leading-out end electrically connected with the diodes, namely, the two jumper wires in the battery module are electrically connected with the diodes through the same leading-out end, so that the leading-out end is more convenient to penetrate out of the backboard, the short circuit of the leading-out end is avoided, the two jumper wires in the battery module are connected with the same or the same group of diodes, the number of the diodes is reduced, and the cost is reduced.
In one implementation, the first string set and the second string set are connected in parallel by a middle bus bar; the width of the insulating strip in the second direction is smaller than the spacing between two adjacent middle bus bars in the second direction. By adopting the scheme, the insulating strip and the middle bus bar can be prevented from being overlapped, so that the thickness of the overlapped area of the insulating strip and the middle bus bar is prevented from being increased, the condition that bubbles are increased due to overlarge local thickness in the lamination process is reduced, and the lamination effect and the yield are improved.
In one implementation, two first battery strings or two second battery strings are connected in series by an end bus bar, and the first string group and the second string group are connected in parallel by a middle bus bar;
In the battery module, insulating strips between two first battery strings and insulating strips between two second battery strings are arranged along a first direction, gaps are reserved between the insulating strips, and the length of the insulating strips along the first direction is greater than that of the corresponding battery strings and is smaller than the distance between the end bus bars and the middle bus bars. By adopting the technical scheme, the battery piece and the jumper wire can be completely isolated by the insulating strip, short circuit is prevented, the insulating strip can be prevented from shielding the end bus bar, the jumper wire is influenced to be electrically connected with the end bus bar, and the processing efficiency is improved. In this scheme, insulating strip is located between tip busbar and the middle part busbar, prevents insulating strip and middle part busbar overlap, and then can prevent that the position of middle part busbar from producing the bubble in the lamination process, has improved photovoltaic module's yield.
In addition, the insulating strips of the first string group and the insulating strips of the second string group are discontinuous at positions nearby the middle bus bar, so that the insulating strips can be further prevented from being overlapped with the middle bus bar. Meanwhile, the length of the insulating strip along the first direction is shorter, the ductility of the insulating strip is better, the position of the insulating strip is not easy to deviate in the lamination process, and the yield of the photovoltaic module is improved.
In one implementation, the battery string further comprises a first shielding film, wherein one side edge of the first shielding film along the first direction is overlapped with the edge of the backlight surface of the battery string end battery piece, and the insulating strip is partially overlapped with the first shielding film. So set up, observe to the light side from photovoltaic module, first shielding film can shelter from the part of a plurality of conductive connection bars between battery cluster tip and the busbar, and first shielding film can also shelter from the tip of insulating strip simultaneously to photovoltaic module to the clean and tidy degree and the uniformity of plain noodles have been improved.
In one implementation, the bus bar further comprises a second shielding film, wherein the second shielding film is arranged on one side, close to the front plate, of the end bus bar, and the width of the second shielding film along the first direction is larger than that of the end bus bar;
the second shielding film covers a gap between the insulating bar and the end bus bar.
According to the technical scheme, the second shielding film can shield the end part of the insulating strip and the gap between the insulating strip and the end bus bar, and can completely shield the end bus bar, the end part of the insulating strip and the gap between the insulating strip and the end bus bar when being observed from the light side of the photovoltaic module, so that the cleanliness and consistency of the light facing surface of the photovoltaic module are further improved, the appearance requirements of different application scenes on the photovoltaic module can be met, and the overall attractiveness of the photovoltaic module in each application scene is considered.
In one implementation mode, the surface of one side, close to the front plate, of the insulating strip is the same as or similar to the color of the light-receiving surface of the battery piece; or, the surface of one side of the insulating strip, which is close to the front plate, is white or black. So that the color of the light-facing surface of the photovoltaic module is consistent, and the consistency and the aesthetic property of the light-facing surface of the photovoltaic module are further improved.
In one implementation, the insulating strip includes at least a first layer and a second layer, the first layer being in contact with the battery plate or jumper;
The first layer is a glue layer, and the second layer is a shielding layer. The first layer can be in contact with the battery plate or the jumper wire so that the insulating strips are bonded with the battery plate or the jumper wire, and positioning of the insulating strips is facilitated.
In one implementation, the first layer is an ethylene-vinyl acetate copolymer layer, a polyolefin elastomer layer, a composite layer of an ethylene-vinyl acetate copolymer layer and a polyolefin elastomer layer, an epoxy resin layer, a polyethylene layer, a composite layer of an epoxy resin layer and an ethylene-vinyl acetate copolymer layer or a composite layer of a polyethylene layer and an ethylene-vinyl acetate copolymer layer, and the above materials have excellent insulating properties and chemical stability and are suitable for adhesives in the field of solar cells; and/or the number of the groups of groups,
The second layer is a polyimide layer or a polyethylene terephthalate layer, and the polyimide layer and the polyethylene terephthalate have the advantages of good mechanical property and high insulativity, so that the polyimide layer or the polyethylene terephthalate layer is used as a shielding layer, is not easy to deform, has strong tensile strength and good insulativity; and/or the number of the groups of groups,
The surface of the second layer is provided with an ultraviolet-resistant coating, so that the insulating strip can be prevented from aging and yellowing under the action of light and heat, and the service life of the insulating strip is prolonged; and/or the number of the groups of groups,
The color of the second layer is the same as or similar to that of the light-receiving surface of the battery piece, and the consistency of the light-receiving surface of the photovoltaic module is further improved.
In one implementation, the insulating strip further comprises a third layer, wherein the first layer, the second layer and the third layer are overlapped and any two adjacent layers are adhered to each other;
The third layer is a composite layer of an ethylene-vinyl acetate copolymer layer, a polyolefin elastomer layer, an ethylene-vinyl acetate copolymer layer, and a polyolefin elastomer layer. The third layer is also sticky, so that the two side surfaces of the insulating strip can be respectively adhered to the battery piece and the jumper wire, the insulating strip and the jumper wire are more convenient to position, and the insulating strip and the jumper wire are not easy to deviate in the lamination process.
In one implementation, the first layer has a thickness of 20um-200um; and/or the thickness of the second layer is 20um-200um; and/or the thickness of the third layer is 20um-200um, so that the thickness of the insulating strip is not too thick, the stress non-uniformity in the lamination process is reduced, the situation of cell fragments and hidden cracks is caused, meanwhile, the problems that the bonding is unstable and displacement is generated due to the too thin thickness of the insulating strip, the isolation effect is reduced, the short circuit risk is improved, and the problem that the insulating strip is easy to age and turn yellow due to the too thin thickness is also avoided.
In one implementation, the battery cell also comprises a positioning adhesive tape, wherein the positioning adhesive tape is bonded with the jumper wire or the insulating strip, and the positioning adhesive tape is also bonded with the backlight surface of the battery cell. In the lamination process, the positions of the battery pieces are more stable and are not easy to deviate than the positions of the insulating strips and the jumper wires, so that the positioning adhesive tape is bonded with the jumper wires or the insulating strips and simultaneously bonded with the backlight surface of the battery pieces, and the positioning adhesive tape can prevent the jumper wires and the insulating strips from deviating in the lamination process.
In one implementation, along the second direction, two ends of the positioning adhesive tape are respectively bonded with the backlight surfaces of the battery pieces at two sides of the jumper wire, and a part between the two ends of the positioning adhesive tape is bonded with the jumper wire and the insulating strip. In this scheme, the battery piece with two adjacent battery strings is pasted simultaneously to the location sticky tape, and location sticky tape both ends atress is more balanced, and the pulling effect of location sticky tape makes the battery piece of two adjacent battery strings be difficult for taking place the position offset, and the reliability that the battery piece, jumper wire and the insulating strip of two adjacent battery strings were fixed a position has been guaranteed simultaneously to the location sticky tape.
In one implementation, the jumper is provided with at least one positioning adhesive tape, the positioning adhesive tape and the battery backlight surface are bonded to form bonding points, and the bonding points are arranged between 2-6 battery pieces which are away from the middle bus bar along the first direction. In the range of 2-6 battery pieces from the middle bus bar, the positioning adhesive tape is adhered to the backlight surface of the battery, so that the positioning adhesive tape can be prevented from seriously deviating to the end part of the battery string, the jumper wire and the insulating strip are prevented from being positioned by the positioning adhesive tape in a longer interval along the first direction, the positioning effect of the positioning adhesive tape is ensured, and the extension space of the insulating strip and the jumper wire is reserved, so that the product yield is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:
Fig. 1 is a schematic circuit connection diagram of a photovoltaic module according to an embodiment of the present utility model;
Fig. 2 is a schematic diagram of the cooperation of a jumper, an insulating strip and a battery piece according to an embodiment of the present utility model;
Fig. 3 is a schematic view of a photovoltaic module according to an embodiment of the present utility model;
FIG. 4 is an enlarged view of a portion of area A of FIG. 3;
FIG. 5 is an enlarged schematic representation of region B of FIG. 3;
FIG. 6 is an enlarged schematic view of area B of FIG. 3;
FIG. 7 is an enlarged view of a portion of region C of FIG. 3;
FIG. 8 is a schematic diagram of the mating of jumpers, end bus bars, middle bus bars, and insulating bars provided by embodiments of the present utility model;
FIG. 9 is a schematic diagram illustrating the cooperation of a jumper with a middle bus bar according to an embodiment of the present utility model;
fig. 10 is a schematic view of another angle of the photovoltaic module according to the embodiment of the present utility model;
FIG. 11 is an enlarged view of a portion of region D of FIG. 10;
fig. 12 is a partial enlarged view of the area E in fig. 10.
Reference numerals:
100-battery module, 101-first battery string, 110-first string set, 102-second battery string, 103-battery tab, 104-end conductive connection bar, 105-conductive connection bar, 120-second string set, 200-diode, 300-jumper, 400-insulating bar, 500-middle bus bar, 600-end bus bar, 700-first shielding film, 800-third shielding film, 900-second shielding film.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. The meaning of "a number" is one or more than one unless specifically defined otherwise.
In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements 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 utility model.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
The embodiment of the utility model provides a photovoltaic module, which comprises a front plate, a first adhesive film layer, a battery piece layer, a second adhesive film layer and a back plate which are sequentially laminated. The front plate is positioned on the light-facing side of the photovoltaic module and used for transmitting sunlight and improving the waterproof and moistureproof capacity of the photovoltaic module. The backboard is positioned on the backlight side of the photovoltaic module and used for packaging and fixing the battery piece layer together with the front board. The first glued membrane layer is used for protecting the battery piece layer to the light side, and the second glued membrane layer is used for protecting the battery piece layer at the side of being shaded, and in photovoltaic module's lamination process, first glued membrane layer and second glued membrane layer are used for encapsulating protection battery piece layer, prevent that external environment from causing the influence to the performance of battery piece layer, can also bond front bezel, backplate and battery piece layer into a whole simultaneously.
As shown in fig. 1-3, the battery sheet layer includes a battery string, a jumper 300, a diode 200, and an insulating bar 400. The number of the battery strings is multiple, the battery strings comprise a plurality of battery pieces 103, and the plurality of battery pieces 103 are sequentially arranged along the first direction. In the battery string, two adjacent battery pieces 103 are electrically connected by a plurality of conductive connection bars 105 arranged in the second direction. Specifically, the conductive connection bars 105 extend along the first direction, and the plurality of conductive connection bars 105 between two adjacent battery pieces 103 may be parallel to each other and arranged along the second direction, and the two adjacent battery pieces 103 are connected in series through the plurality of conductive connection bars 105. Further, the conductive connecting bar 105 located on the side in the second direction is an end conductive connecting bar 104, that is, the conductive connecting bar 105 located on the most side in the second direction among the plurality of conductive connecting bars 105 between the adjacent two battery pieces 103 is an end conductive connecting bar 104.
The battery string includes a plurality of first battery strings 101 and second battery strings 102, wherein the plurality of first battery strings 101 are sequentially arranged in the second direction, and a length direction of the first battery strings 101 extends in the first direction. The plurality of second battery strings 102 are sequentially arranged in the second direction, and the length direction of the second battery strings 102 extends in the first direction. The two first battery strings 101 are connected in series through a serial connection point to form a first string group 110, that is, two adjacent first battery strings 101 are electrically connected with the same serial connection point so that the two first battery strings 101 are connected in series to form the first string group 110. The two second battery strings 102 are connected in series through the series connection point to form the second string set 120, that is, two adjacent second battery strings 102 are electrically connected with the same series connection point so that the two second battery strings 102 are connected in series to form the second string set 120. The first string set 110 and the second string set 120 are arranged along a first direction, and the first string set 110 and the second string set 120 are connected in parallel to form a battery module 100, the photovoltaic module comprises a plurality of battery modules 100, and the plurality of battery modules 100 are arranged in sequence along a second direction.
The jumper 300 is located between the battery strings adjacent in the second direction, that is, the jumper 300 is provided between the two first battery strings 101 adjacent in the second direction, and/or the jumper 300 is provided between the two second battery strings 102 adjacent in the second direction. Here, in the present application, the battery strings adjacent in the second direction are two first battery strings 101 adjacent in the second direction or two second battery strings 102 adjacent in the second direction, which will not be explained one by one. One end of the jumper 300 is electrically connected to the series connection point, that is, one end of the jumper 300 is electrically connected to the series connection point between the two first battery strings 101, or one end of the jumper 300 is electrically connected to the series connection point between the two second battery strings 102. One end of the jumper 300 is electrically connected with the series connection point, the other end of the jumper 300 is electrically connected with the diode 200 to realize that the battery string and the diode 200 are in inverse parallel connection, so that when the battery piece 103 in the photovoltaic module generates a hot spot effect, the diode 200 adjacent to the battery piece 103 can have a bypass effect on the battery piece 103, and the current generated by the rest battery pieces 103 of the battery string can be led out through the jumper 300 and finally led out smoothly through the positive electrode leading-out end and the negative electrode leading-out end of the photovoltaic module, thereby reducing the influence of the hot spot phenomenon on the photovoltaic module.
As shown in fig. 2, both side edges of the jumper 300 in the second direction overlap with the edges of the battery pieces 103 of two adjacent battery strings in the second direction, respectively. Wherein, the two side edges of the jumper 300 along the second direction refer to two opposite side edges of the jumper 300 along the second direction, and do not refer to edges of the jumper 300 parallel to the second direction. In this embodiment, the width direction of the jumper 300 is the second direction, and two side edges of the jumper 300 along the second direction also refer to two opposite side edges of the jumper 300 along the width direction. The two side edges of the jumper 300 along the second direction are respectively overlapped with the edges of the battery pieces 103 of the two battery strings in the first string group 110 or the second string group 120, so that compared with the situation that the jumper 300 is not overlapped with the battery pieces 103 of the battery strings in the prior art, the jumper 300 is completely positioned in the gap of the adjacent battery strings, and compared with the situation that the string spacing of the two adjacent battery strings along the second direction can be properly reduced, so that the effective power generation area is improved on the premise that the overall size of the photovoltaic module is unchanged.
The applicant analysis shows that, because the jumper 300 has a certain thickness, when the jumper 300 overlaps the battery piece 103, if the jumper 300 overlaps the conductive connection strip 105, the local position of the battery piece 103 is too thick, and in the lamination process of the photovoltaic module, the overlapping position of the jumper 300 and the conductive connection strip 105 is easy to generate stress concentration, so that the phenomenon of fragments or hidden cracks of the battery piece 103 is generated. In view of the above, in the photovoltaic module provided by the utility model, the jumper 300 does not overlap with the end conductive connection bars 104 of two adjacent battery strings along the second direction, that is, the jumper 300 is located in the gap between the end conductive connection bars 104 of two adjacent battery strings along the second direction, and the opposite side edges of the jumper 300 along the width direction do not exceed the end conductive connection bars 104 of two adjacent battery strings. By the arrangement, the jumper 300 is only overlapped with the battery pieces 103 of two adjacent battery strings along the second direction and is not connected with any conductive connecting strip, so that the situation that the local positions are too thick due to the overlapping of the jumper 300 and the conductive connecting strip 105 is avoided, the condition that stress concentration occurs in the coverage area of the jumper 300 is reduced in the lamination process of the photovoltaic module, and the phenomenon of fragments or hidden cracks of the battery pieces 103 is avoided.
The jumper 300 is typically a conductor formed of a conductive material, and when it overlaps the array of cells 103, the jumper 300 contacts the conductive connection bars 105 for making electrical connection between the cells 103, which may cause the electrical connection to be shorted, thereby affecting the proper operation of the photovoltaic module. In view of the above, in the present utility model, the insulating bar 400 is provided between the battery cell 103 and the jumper 300, the width direction of the insulating bar 400 is the second direction, and the width of the insulating bar 400 is larger than the width of the jumper 300. The two side edges of the insulating strip 400 along the second direction exceed the two side edges of the jumper 300, that is, the insulating strip 400 completely covers the jumper 300 in the width direction, so that the insulating strip 400 completely isolates the battery piece 103 from the jumper 300, and the battery piece 103 and the jumper 300 are prevented from being in contact to generate a short circuit, and the normal operation of the photovoltaic module is ensured.
In summary, when the photovoltaic module provided by the utility model is adopted, since the two side edges of the jumper 300 along the second direction are respectively overlapped with the edges of the battery pieces 103 of two adjacent battery strings along the second direction, and the jumper 300 is not overlapped with the end conductive connecting strips 104 of the two adjacent battery strings along the second direction, the string spacing between the two adjacent battery strings along the second direction can be properly reduced, so that the effective power generation area can be increased on the premise of unchanged overall size of the photovoltaic module, and meanwhile, the situation that the local positions are too thick due to the overlapping of the jumper 300 and the conductive connecting strips 105 can be prevented, and the stress concentration of the coverage area of the jumper 300 is reduced in the lamination process of the photovoltaic module, thereby avoiding the phenomena of fragments or hidden cracks of the battery pieces 103.
In the embodiment of the present utility model, the first direction and the second direction may be perpendicular, or an included angle between the first direction and the second direction is between 85 ° and 90 °, which is not limited herein.
In addition, in the embodiment of the present utility model, the battery piece 103 has a plurality of first main grids and a plurality of second main grids alternately arranged along the second direction, and the first main grids and the second main grids have different conductive types, wherein the first main grids may be positive main grids, and the second main grids may be negative main grids. The first and second main gates extend in a first direction. The conductive connection strips 105 are connected with the main grids of the battery pieces 103, and in the battery string, the first main grid and the second main grid of two adjacent battery pieces 103 are electrically connected through the conductive connection strips 105, and the conductive connection strips 105 can be specifically solder strips.
Because the length of the jumper 300 is longer, the jumper 300 may shift or tilt during lamination, resulting in the jumper 300 being locally adjacent to or beyond the edge of the insulating strip 400, which may result in an increased risk of shorting the jumper 300 to the end conductive connection strip 104, in this embodiment, as shown in fig. 2, the two side edges of the insulating strip 400 extend beyond the end conductive connection strips 104 of two adjacent battery strings in the second direction, i.e., the width of the insulating strip 400 is greater than the distance between the end conductive connection strips 104 of two adjacent battery strings. In the width direction, the insulating strips 400 cover the end conductive connection strips 104 of two adjacent battery strings, so that even if the jumper wire is offset or inclined in the lamination process, the insulating strips 400 can still isolate the jumper wire 300 from the end conductive connection strips 104, and the risk of short circuit between the jumper wire 300 and the end conductive connection strips 104 is avoided.
It should be noted that, the edge of the insulating strip 400 is not flush with the end conductive connecting strip 104 of the battery string, but the edge of the insulating strip 400 is offset with the end conductive connecting strip 104 of the battery string, so that the phenomenon that when the edge of the insulating strip 400 is flush with the end conductive connecting strip 104, the height difference at the position is too large, stress concentration is easily generated in the lamination process, and fragments or hidden cracks of the battery sheet 103 are caused is avoided.
Further, in the second direction, both side edges of the insulating strip 400 extend beyond the end conductive connecting strips 104 of two adjacent battery strings in the second direction and do not overlap with the conductive connecting strips adjacent to the end conductive connecting strips 104, i.e., in the width direction, the insulating strip 400 covers the end conductive connecting strips 104 of two adjacent battery strings and does not extend beyond the conductive connecting strips 105 adjacent to the end conductive connecting strips 104. If the conductive connecting strip 105 of the battery piece 103 adjacent to the end conductive connecting strip 104 is a second conductive connecting strip, the edge of the insulating strip 400 is located in the gap between the end conductive connecting strip 104 and the second conductive connecting strip along the second direction. By the arrangement, the insulating strip 400 is ensured to isolate the jumper 300 from the battery piece 103 and the end conductive connecting strip 104, the short circuit risk is reduced, and meanwhile, the width of the insulating strip 400 is properly reduced, so that the material of the insulating strip 400 is saved. In addition, to the double-sided battery, can also avoid the back of double-sided battery to be sheltered from too much and influence generating efficiency, promote the pleasing to the eye degree of dual glass assembly simultaneously.
The conductive connection strips 105 on the battery piece 103 adjacent to the end conductive connection strips 104 are further away from the jumper 300, and the risk of the jumper 300 being electrically connected to the conductive connection strips 105 adjacent to the end conductive connection strips 104 is smaller, so that the insulating strips 400 do not have to cover the conductive connection strips 105 adjacent to the end conductive connection strips 104. Of course, according to practical situations, the insulating strip 400 may also overlap with the end conductive connecting strip 104 and the conductive connecting strip 105 adjacent to the end conductive connecting strip 104, that is, the insulating strip 400 may also cover the end conductive connecting strip 104 and the second conductive connecting strip, thereby further improving the reliability of the photovoltaic module.
In another embodiment, in the second direction, the widths of the overlapping areas of the two side edges of the jumper 300 and the battery string are the first width and the second width, respectively. Specifically, as shown in fig. 2, the extending distance of the left-side and left-side battery string overlapping area of the jumper 300 along the second direction is a first width, and the extending distance of the right-side and right-side battery string overlapping area of the jumper 300 along the second direction is a second width.
During lamination and welding, the jumper 300 may shift due to operation errors and ductility of the jumper 300 itself, so that the difference between the widths of the two side edges of the jumper 300 and the cell 103 may be large. When only the jumper 300 and the insulating strip 400 are disposed in the battery string gap during lamination, if the difference between the widths of the two side edges of the jumper 300 and the overlapping width of the battery piece 103 is large, the stress concentration at the edge of the battery piece 103 is caused, and the battery piece 103 is easily broken or hidden. Based on the above situation, in this embodiment, the width of the overlapping area between the two side edges of the jumper and the battery string is kept within a reasonable range, and when the first width is smaller than the second width, the first width/the second width is less than or equal to 50%; when the second width is smaller than the first width, the second width/the first width is less than or equal to 50%, so that the jumper position is prevented from being seriously deviated, the difference of the overlapping widths of the two side edges of the jumper and the battery piece is smaller, the condition of stress concentration of the edge of the battery piece is reduced, and the probability of broken and hidden cracks of the battery piece is further reduced.
Specifically, when the first width is smaller than the second width, the first width/second width may be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, or 50%. Or the second width is less than the first width, the second width/first width may be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, or 50%.
Of course, it is within the scope of the present application that the first width is less than the second width, the first width/second width is greater than 50%, and the second width/first width is greater than 50% when the second width is less than the first width.
Specifically, when the width of the jumper 300 is greater than 8mm, the jumper 300 may overlap with the conductive connection strip 105 of the battery string, and the thickness of the overlapping position of the jumper 300 and the conductive connection strip 105 is thicker, so that stress concentration is easy to occur, and the phenomenon of broken or hidden crack of the battery piece 103 is generated; when the width of the jumper 300 is less than 3mm, the resistance of the jumper 300 is significantly increased, which may result in a large current loss. In view of the above, the width of the jumper 300 in the second direction is set within a reasonable range of 3mm-8mm to reduce current loss of the jumper 300 while reducing the phenomena of battery piece fragments or hidden cracks. Specifically, the width of the jumper 300 in the second direction may be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, or 8mm, preferably 4mm-6mm.
The width of the insulating strip 400 in the second direction is 10mm-30mm. Because the length of the jumper 300 is longer, the jumper 300 is easy to shift in position in the lamination process of the photovoltaic module, when the width of the insulating strip 400 is smaller than 10mm, the distance between the two side edges of the insulating strip 400 and the two side edges of the jumper 300 is smaller, the jumper 300 may shift to the outer side of the insulating strip 400, and the shifted jumper 300 is in contact with the battery piece 103 or the conductive connecting strip 105, so that the risk of short circuit is higher. When the width of the insulation bar 400 is greater than 30mm, waste of the material of the insulation bar 400 may be caused. In view of the above, in this embodiment, the width of the insulating strip 400 is set within a reasonable range of 10mm-30mm, so as to prevent the jumper 300 from moving to the outside of the insulating strip 400 when the jumper 300 is shifted, and save the material of the insulating strip 400 more while reducing the risk of short-circuiting the jumper 300.
Specifically, the width of the insulating strip 400 in the second direction may be 10mm, 12mm, 14mm, 15mm, 16mm, 18mm, 20mm, 22mm, 24mm, 25mm, 26mm, 28mm or 30mm, etc., preferably 10mm to 20mm.
In addition, in the second direction, the width of the insulation bar 400 is 5mm-20mm greater than the width of the jumper 300. So can guarantee that the both sides edge of insulating strip 400 surpasses the distance of jumper 300 both sides edge and can not be too little, and then can prevent photovoltaic module lamination in-process, jumper 300 position offset to insulating strip 400 outside, reduced the short circuit risk, also made insulating strip 400's width can not be too wide simultaneously, avoided insulating strip 400 material's waste. Specifically, in the second direction, the width of the insulating strip 400 may be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, or the like greater than the width of the jumper 300.
In the above embodiment, it is understood that the jumper 300 is greater than 8mm, the jumper 300 is less than 3mm, the insulating strip 400 is less than 10mm, the insulating strip 400 is greater than 30mm, the difference between the width of the insulating strip 400 and the width of the jumper 300 is more than 20mm, and/or the difference between the width of the insulating strip 400 and the width of the jumper 300 is less than 5 mm.
The battery module 100 includes a first string group 110 and a second string group 120 arranged along a first direction, wherein the jumper 300 of the first string group 110 is located between two first battery strings 101, the jumper 300 of the second string group 120 is located between two second battery strings 102, and the jumper 300 between the two first battery strings 101 and the jumper 300 between the two second battery strings 102 can be independent from each other, i.e., the jumper 300 between the two first battery strings 101 and the jumper 300 between the two second battery strings 102 are intermittently arranged without connection and with a gap therebetween, so that the jumper 300 is short in length along the first direction, and the jumper 300 is not easily shifted in the lamination process. Or as shown in fig. 5 and 6, the jumper 300 between the two first battery strings 101 and the jumper 300 between the two second battery strings 102 are connected together by welding; alternatively, as shown in fig. 8 and 9, two jumpers 300 may be integrally formed, so that the jumpers 300 are more convenient to manufacture.
As shown in fig. 9, the jumper 300 between the two first battery strings 101 and the jumper 300 between the two second battery strings 102 are electrically connected to the same outlet terminal electrically connected to the diode 200, that is, the two jumper 300 in the battery module are electrically connected to the diode 200 through the same outlet terminal, so that the outlet terminal is more convenient to pass through the back plate, short circuit of the outlet terminal is avoided, and the two jumper 300 in the battery module are connected to the same diode or the same group of diodes 200, thereby reducing the number of diodes and reducing the cost.
The number of the diodes 200 may be two, the two diodes 200 are a first diode and a second diode, respectively, the cathode of the first diode is connected with the anode of the battery string, the anode of the first diode is connected with the cathode of the second diode, and the anode of the second diode is connected with the cathode of the battery string; the negative electrode of the second diode is connected with the positive electrode of the battery string. The lead-out terminals electrically connected with the two jumpers 300 of the battery module 100 are connected with the positive electrode of the first diode, however, the lead-out terminals electrically connected with the two jumpers 300 of the battery module 100 may be connected with the negative electrode of the second diode, so that the first battery string 101 and the second battery string 102 are connected in parallel, and the reverse voltage of the first diode and the second diode is equal to the voltage of the first battery string 101 or the second battery string 102, so that the probability of reverse breakdown of the first diode and the second diode is effectively reduced.
In the battery module 100, two battery strings are connected in series through the end bus bar 600 in the second direction to form a battery string group, that is, two first battery strings 101 are arranged in the second direction, and the conductive connection bars 105 at the ends of the first battery strings 101 in the first direction are electrically connected with the end bus bar 600, so that the two first battery strings 101 are connected in series through the end bus bar 600 to form the first string group 110. The two second battery strings 102 are arranged in the second direction, and the conductive connection bars 105 at the ends of the second battery strings 102 in the first direction are electrically connected to the end bus bars 600, so that the two second battery strings 102 are serially connected to form the second string group 120 through the end bus bars 600. The end bus bars 600 of the first string set 110 and the end bus bars 600 of the second string set 120 are located at the ends of the first string set 110 and the second string set 120, respectively, facing away from each other. One end of the jumper 300 may be electrically connected with the end bus bar 600, and the other end of the jumper 300 is electrically connected with the diode 200.
In the first direction, the first and second string groups 110 and 120 are connected in parallel by the middle bus bar 500 to form the battery module 100, i.e., the first and second string groups 110 and 120 are arranged in the first direction, and the conductive connection bars 105 of the ends of the first and second string groups 110 and 120 in the first direction are electrically connected to the middle bus bar 500, so that it is achieved by the middle bus bar 500, and the first and second string groups 110 and 120 are connected in parallel.
As shown in fig. 5 and 6, further, the width of the insulating strip 400 along the second direction is smaller than the distance between two adjacent middle bus bars 500 along the second direction, so that the insulating strip 400 and the middle bus bars 500 can be prevented from overlapping, and the thickness of the overlapping area of the insulating strip 400 and the middle bus bars 500 is prevented from increasing, so that the condition that bubbles are increased due to the fact that the local thickness is too thick in the lamination process is reduced, and the lamination effect and the yield are improved.
It should be understood that it is within the scope of the present application that the width of the insulating bar 400 in the second direction is equal to or greater than the spacing between two adjacent middle bus bars 500 in the second direction.
As shown in fig. 5 and 7, the insulating strips 400 of the first string set 110 and the insulating strips 400 of the second string set 120 may be arranged in the first direction with a gap therebetween, or, alternatively, the insulating strips 400 of the first string set 110 and the insulating strips 400 of the second string set 120 may be independent from each other and not connected therebetween. The length of the insulating strip 400 in the first direction is greater than the length of the corresponding battery string to ensure that the insulating strip 400 completely isolates the battery cells 103 from the jumper 300, preventing a short circuit. And, the length of the insulating bar 400 along the first direction is smaller than the distance between the end bus bar 600 and the middle bus bar 500, so that the insulating bar 400 can be prevented from shielding the end bus bar 600 and the middle bus bar 500, the conductive connection bar 105 is affected to be connected with the end bus bar 600 or the middle bus bar 500, and the processing efficiency is improved, because once the insulating bar 400 shields the end bus bar 600 and the middle bus bar 500, the insulating bar 400 is manually placed under the end bus bar 600 and the middle bus bar 500, the process is more complicated, and the processing efficiency is reduced. In this embodiment, the insulating bar 400 is located between the end bus bar 600 and the middle bus bar 500, preventing the insulating bar 400 from overlapping the middle bus bar 500, and thus preventing the position of the middle bus bar 500 from generating bubbles during lamination, improving the yield of the photovoltaic module.
Further, the insulation bars 400 of the first string set 110 and the insulation bars 400 of the second string set 120 are intermittently positioned near the middle bus bar 500, and overlapping of the insulation bars 400 with the middle bus bar 500 can be further prevented. Meanwhile, the length of the insulating strip 400 along the first direction is shorter, the ductility of the insulating strip 400 is better, the position of the insulating strip 400 is not easy to deviate in the lamination process, and the yield of the photovoltaic module is improved.
Of course, it is also within the scope of the present application that the length of the insulating bar 400 in the first direction is equal to or greater than the distance between the end bus bar 600 and the middle bus bar 500.
As shown in fig. 6, the insulating strips 400 of the first string set 110 and the insulating strips 400 of the second string set 120 may also be integrally formed, so that the insulating strips 400 may isolate the connection position of the jumper 300 and the outlet, and reduce the risk of short-circuiting at the connection position of the jumper 300 and the outlet.
As shown in fig. 10 and 11, in the above technical solution, the photovoltaic module further includes a first shielding film 700, and an edge of one side of the first shielding film 700 along the first direction overlaps an edge of the backlight surface of the cell string end cell 103. The length direction of the first shielding film 700 extends in the second direction, and the width direction of the first shielding film 700 is disposed in the first direction. One side edge of the first shielding film 700 along the first direction overlaps with an edge of the backlight surface of the battery string end battery piece 103, wherein one side edge of the first shielding film 700 along the first direction specifically refers to one side edge of the first shielding film 700 along the width direction, and does not refer to an edge of the first shielding film 700 parallel to the first direction, that is, one side edge of the first shielding film 700 along the width direction overlaps with an edge of the backlight surface of the battery string end battery piece 103, the edge of the battery string end battery piece 103 refers to an edge of the battery string at the most edge along the first direction, the first shielding film 700 contacts with the backlight surface of the edge of the battery piece 103, and the first shielding film 700 is located between the conductive connecting strip 105 and the battery piece 103, so that the first shielding film 700 is located on one side of the conductive connecting strip 105 close to the front plate. Also, the distance of the first shielding film 700 beyond the battery string end cell 103 is smaller than the distance of the conductive connection bar 105 beyond the battery string end cell 103 in the first direction, so that the portion of the conductive connection bar 105 beyond the first shielding film 700 in the first direction can be connected with the bus bar, thereby preventing the first shielding film 700 from affecting the contact and connection of the conductive connection bar 105 with the bus bar. In this solution, the battery string may be the first battery string 101 or the second battery string 102. The first shielding film 700 can shield a part of the plurality of conductive connection bars 105 between the end of the battery string and the bus bar, as viewed from the light-facing side of the photovoltaic module, thereby improving the cleanliness and consistency of the light-facing surface of the photovoltaic module.
As shown in fig. 11, in the above embodiment, the insulating strip 400 is partially overlapped with the first shielding film 700, and thus, the first shielding film 700 is provided to shield the end of the insulating strip 400, so that the gaps between adjacent strings of cells are more neat when viewed from the light-facing side of the photovoltaic module.
In another embodiment, the photovoltaic module further includes a second shielding film 900, where the second shielding film 900 is disposed on a side of the end bus bar 600 near the front plate, and a width of the second shielding film 900 along the first direction is greater than a width of the end bus bar 600. The length direction of the second shielding film 900 extends in the second direction, and the width direction of the second shielding film 900 is disposed in the first direction. The second shielding film 900 is disposed on one side of the end bus bar 600 near the front plate, and along the first direction, the width of the second shielding film 900 is greater than the width of the end bus bar 600, that is, the width of the second shielding film 900 is greater than the width of the end bus bar 600, the two side edges of the second shielding film 900 in the width direction respectively exceed the two side edges of the end bus bar 600 in the width direction, and the two side edges of the second shielding film 900 in the width direction are two side edges of the second shielding film 900 opposite in the width direction. In addition, as shown in fig. 12, the second shielding film 900 covers the gap between the insulating bar 400 and the end bus bar 600, so that the second shielding film 900 shields the end of the insulating bar 400 and the gap between the insulating bar 400 and the end bus bar 600, and the second shielding film 900 can completely shield the gap between the end bus bar 600, the end of the insulating bar 400 and the gap between the insulating bar 400 and the end bus bar 600 when viewed from the light side of the photovoltaic module, thereby further improving the neatness and consistency of the light facing surface of the photovoltaic module, meeting the appearance requirements of the photovoltaic module in different application scenarios, and taking into account the overall aesthetic property of the photovoltaic module in each application scenario.
In the above embodiment, as shown in fig. 11, the photovoltaic module may further include a third shielding film 800, where the third shielding film 800 is disposed on one side of the middle bus bar 500 near the front plate, the width of the third shielding film 800 along the first direction is greater than that of the middle bus bar 500, and two opposite side edges of the third shielding film 800 respectively exceed two opposite side edges of the middle bus bar 500 along the first direction, and the third shielding film 800 completely shields the middle bus bar 500 when viewed from the light side of the photovoltaic module, so as to further improve the cleanliness and consistency of the light facing surface of the photovoltaic module.
In another embodiment, the first shielding film 700 and the second shielding film 900 are insulating films, so that the short circuit between the positive and negative grid lines of the battery piece 103 and the power generation efficiency is prevented from being affected when the first shielding film 700 and the second shielding film 900 are in contact with the battery piece 103, the bus bar or the conductive connection bar 105.
The color of one side surface of the insulating strip 400 close to the front plate is the same as or similar to that of the light receiving surface of the battery piece 103, so that the color of the insulating strip 400 is the same as or similar to that of the light receiving surface of the battery piece 103 when seen from the light receiving surface of the photovoltaic module, the light receiving surface of the photovoltaic module is consistent in color, and the consistency and the attractiveness of the light receiving surface of the photovoltaic module are further improved. Specifically, the insulating strip 400 is black or white in color on one side surface thereof adjacent to the front plate.
In another preferred embodiment, the insulating strip 400 comprises at least a first layer and a second layer, which are arranged one above the other to form the insulating strip 400. The first layer may be an adhesive layer, the second layer may be a shielding layer, and the color of the shielding layer is the same as or similar to that of the light facing surface of the battery piece 103, or the shielding layer is black or white. The first layer may contact the battery tab 103 or the jumper 300 to bond the insulating bar 400 to the battery tab 103 or the jumper 300, thereby facilitating positioning of the insulating bar 400.
In the above embodiment, the first layer may be an ethylene-vinyl acetate copolymer layer (EVA, ethylene Vinyl Acetate), a polyolefin elastomer layer (POE, polyolyaltha Olfin), a composite layer of an ethylene-vinyl acetate copolymer layer and a polyolefin elastomer layer, an epoxy resin layer (Phenolic epoxy resin), a polyethylene layer (PE), a composite layer of an epoxy resin layer and an ethylene-vinyl acetate copolymer layer, or a composite layer of a polyethylene layer and an ethylene-vinyl acetate copolymer layer. The materials have excellent insulating property and chemical stability, and are suitable for adhesives in the field of solar cells.
In addition, the second layer may be a Polyimide layer (PI) or a polyethylene terephthalate layer (BHET), and the Polyimide layer and the polyethylene terephthalate have the advantages of good mechanical properties and high insulation, so that the Polyimide layer or the polyethylene terephthalate layer is used as a shielding layer, is not easy to deform, has strong tensile strength, and has good insulation.
The surface of the second layer may have an ultraviolet-resistant coating, so that the insulating strip 400 is prevented from aging and yellowing under the action of light and heat, the service life of the insulating strip 400 is prolonged, and the consistency of the appearance of the photovoltaic module can be continuously maintained.
Optionally, the insulating strip 400 may further comprise a third layer, the first layer, the second layer and the third layer being arranged to overlap and any two adjacent layers being adhered to each other to prevent delamination of the insulating strip 400 during use.
Likewise, the third layer may be a glue layer. The third layer may be an ethylene-vinyl acetate copolymer layer (EVA, ethylene Vinyl Acetate), a polyolefin elastomer layer (POE, polyolyaltha Olfin), a composite layer of an ethylene-vinyl acetate copolymer layer and a polyolefin elastomer layer, an epoxy resin layer (Phenolic epoxy resin), a polyethylene layer (PE), a composite layer of an epoxy resin layer and an ethylene-vinyl acetate copolymer layer, or a composite layer of a polyethylene layer and an ethylene-vinyl acetate copolymer layer. The third layer is also sticky, so that the two side surfaces of the insulating strip 400 can be respectively adhered to the battery piece 103 and the jumper 300, positioning of the insulating strip 400 and the jumper 300 is facilitated, and deflection is not easy to occur in the lamination process.
Too thick of the insulating strip 400 may cause uneven stress, fragments of the battery plate 103 and hidden cracks in the lamination process, too thin of the insulating strip 400 may cause weak adhesion to generate displacement, reduce isolation effect, increase short circuit risk, and in addition, too thin of the insulating strip 400 is easy to age and turn yellow. In view of the above, the thickness of the first layer is 20um to 200um, and exemplary, the thickness of the first layer is 20um, 40um, 50um, 60um, 80um, 100um, 120um, 140um, 150um, 160um, 180um, 200um, or the like, preferably 100um to 180mm.
The thickness of the second layer is 20um to 200um, and exemplary, the thickness of the second layer is 20um, 40um, 50um, 60um, 80um, 100um, 120um, 140um, 150um, 160um, 180um or 200um, etc., preferably 140um to 160mm.
The thickness of the third layer is 20um to 200um, and exemplary, the thickness of the third layer is 20um, 40um, 50um, 60um, 80um, 100um, 120um, 140um, 150um, 160um, 180um, 200um, etc., preferably 100um to 180mm.
While the thickness of the entire insulating strip 400 may be 40um to 600um, exemplary thicknesses of the entire insulating strip 400 may be 40um、60um、80um、100um、120um、150um、180um、200um、240um、200um、240um、280um、300um、340um、380um、400um、420um、450um、480um、500um、520um、550um、580um、600um um, etc. Preferably, the thickness of the insulating strip 400 as a whole is 100mm-120mm.
In another possible embodiment, the photovoltaic module further includes a positioning tape that is bonded to the jumper 300 or the insulating strip 400, and the positioning tape is also bonded to the backlight surface of the battery sheet 103. In the lamination process, the positions of the battery pieces 103 are more stable and are not easy to deviate than the positions of the insulating strips 400 and the jumper wires 300, so that the positioning adhesive tape is adhered to the jumper wires 300 or the insulating strips 400 and is adhered to the backlight surface of the battery pieces 103, and the positioning adhesive tape can prevent the jumper wires 300 and the insulating strips 400 from deviating in the lamination process.
It should be noted that, before lamination, the insulating strip 400 and the jumper 300 may be bonded or spot-welded, so that the insulating strip 400 and the jumper 300 are positioned relatively, then the positioning adhesive tape is bonded to the jumper 300 or the insulating strip 400, and meanwhile, the positioning adhesive tape is bonded to the battery piece 103, so that the jumper 300 and the insulating strip 400 are prevented from being displaced in the lamination process.
In the above embodiment, along the second direction, two ends of the positioning adhesive tape are respectively bonded to the backlight surfaces of the battery pieces 103 on two sides of the jumper 300, and the portion between the two ends of the positioning adhesive tape is bonded to the jumper 300 and the insulating strip 400. That is, both ends of the positioning tape are respectively bonded with the battery pieces 103 of the adjacent two battery strings, and the middle part of the positioning tape is bonded with the jumper 300 and the insulating strip 400. In this scheme, the location sticky tape is pasted with the battery piece 103 of two adjacent battery strings simultaneously, and the atress of location sticky tape both ends is more balanced, and the pulling effect of location sticky tape makes the battery piece 103 of two adjacent battery strings be difficult for taking place the position offset, and the reliability that the battery piece 103 of two adjacent battery strings, jumper 300 and insulating strip 400 location has been guaranteed simultaneously to the location sticky tape.
Of course, only one end of the positioning tape may be adhered to the backlight surface of the battery sheet 103, the other end of the positioning tape may be adhered to the jumper 300, and the portion between the two ends of the positioning tape may be adhered to the jumper 300 and the insulating tape 400.
The jumper 300 is provided with at least one positioning tape, i.e., the jumper 300 between two adjacent battery strings may be bonded with at least one positioning tape, specifically, the jumper 300 between two adjacent battery strings is bonded with one, two, three or more positioning tapes. The positioning adhesive tape is adhered to the battery backlight surface to form an adhesive point, the adhesive point is arranged between 2-6 battery pieces 103 away from the middle bus bar along the first direction, namely in the range of 2-6 battery pieces 103 away from the middle bus bar, and the positioning adhesive tape is adhered to the battery backlight surface, so that the positioning adhesive tape can be prevented from seriously deviating towards the end part of the battery string, the jumper 300 and the insulating strip 400 are prevented from being positioned by the positioning adhesive tape in a longer interval along the first direction, the positioning effect of the positioning adhesive tape is ensured, and the extension space of the insulating strip 400 and the jumper 300 is reserved, and the product yield is improved.
Specifically, in the first direction, the bonding points are spaced apart from the middle bus bar 500 by 2, 3, 4, 5, or 6 battery pieces 103.
Of course, it is also within the scope of the present application to space 7, 8 or more of the battery cells 103 between the bonding point and the middle bus bar 500 in the first direction.
In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims (18)
1. The utility model provides a photovoltaic module, its characterized in that, including front bezel, first glued membrane layer, battery piece layer, second glued membrane layer and backplate that stacks gradually, the battery piece layer includes:
The battery strings comprise a plurality of battery pieces which are arranged along a first direction, two adjacent battery pieces are electrically connected through a plurality of conductive connecting strips which are arranged along a second direction, and the conductive connecting strips which are positioned at the side along the second direction are end conductive connecting strips;
The battery strings comprise a plurality of first battery strings and second battery strings, the two first battery strings are connected in series through a string connection point to form a first string group, the two second battery strings are connected in series through a string connection point to form a second string group, and the first string group and the second string group are arranged along a first direction and are connected in parallel to form a battery module;
The jumper wire and the diode are positioned between the adjacent battery strings along the second direction, one end of the jumper wire is electrically connected with the series connection point, and the other end of the jumper wire is electrically connected with the diode; the two side edges of the jumper wire along the second direction are respectively overlapped with the edges of the battery plates of two adjacent battery strings along the second direction, and the jumper wire is not overlapped with the end conductive connecting strips of the two adjacent battery strings along the second direction;
The insulating strip is arranged between the battery piece and the jumper wire, and two side edges of the insulating strip along the second direction exceed two side edges of the jumper wire.
2. The photovoltaic assembly of claim 1, wherein in the second direction, both side edges of the insulating strip extend beyond end conductive connecting strips of two adjacent strings in the second direction.
3. The photovoltaic module of claim 1, wherein the insulating strip has side edges that extend beyond and do not overlap end conductive strips of two adjacent strings of cells in the second direction.
4. The photovoltaic assembly of claim 1, wherein, in the second direction, the widths of the overlapping regions of the two side edges of the jumper wire and the cell string are a first width and a second width, respectively;
The first width is smaller than the second width, and the first width/the second width is less than or equal to 50%; or, the second width is smaller than the first width, and the second width/first width is less than or equal to 50%.
5. The photovoltaic assembly of claim 1, wherein the jumper has a width in the second direction of 3mm-8mm; and/or the width of the insulating strip along the second direction is 10mm-30mm; and/or, along the second direction, the width of the insulating strip is 5mm-20mm larger than the width of the jumper wire.
6. The photovoltaic module of claim 1, wherein in the battery module, the jumper between the two first battery strings and the jumper between the two second battery strings are independent, welded or integrated;
The jumper wire between the two first battery strings and the jumper wire between the two second battery strings are electrically connected with the same lead-out end electrically connected with the diode.
7. The photovoltaic assembly of claim 1, wherein the first string and the second string are connected in parallel by a middle bus bar; the insulating strips have a width in the second direction that is smaller than the spacing between two adjacent intermediate bus bars in the second direction.
8. The photovoltaic assembly of claim 1, wherein two first or two second strings are connected in series by an end bus bar, the first and second string groups being connected in parallel by a middle bus bar;
In the battery module, insulating strips between two first battery strings and insulating strips between two second battery strings are arranged along a first direction, gaps are reserved between the insulating strips, and the length of the insulating strips along the first direction is greater than that of the corresponding battery strings and is smaller than the distance between the end bus bars and the middle bus bars.
9. The photovoltaic module of claim 8, further comprising a first shielding film, wherein a side edge of the first shielding film in a first direction overlaps an edge of a cell string end cell backlight face, and wherein the insulating strip overlaps the first shielding film.
10. The photovoltaic assembly of claim 8, further comprising a second shielding film disposed on a side of the end bus bar proximate to the front plate, the second shielding film having a width in the first direction that is greater than a width of the end bus bar;
The second shielding film covers a gap between the insulating bar and the end bus bar.
11. The photovoltaic module according to claim 1, wherein a surface of the insulating bar near the front plate has the same or similar color as the light-receiving surface of the battery piece; or, the surface of one side of the insulating strip, which is close to the front plate, is white or black.
12. The photovoltaic assembly of claim 1, wherein the insulating strip comprises at least a first layer and a second layer, the first layer being in contact with the cell sheet or jumper;
the first layer is a glue layer, and the second layer is a shielding layer.
13. The photovoltaic module of claim 12, wherein the first layer is an ethylene-vinyl acetate copolymer layer, a polyolefin elastomer layer, a composite layer of an ethylene-vinyl acetate copolymer layer and a polyolefin elastomer layer, an epoxy resin layer, a polyethylene layer, a composite layer of an epoxy resin layer and an ethylene-vinyl acetate copolymer layer, or a composite layer of a polyethylene layer and an ethylene-vinyl acetate copolymer layer; and/or the number of the groups of groups,
The second layer is a polyimide layer or an ethylene terephthalate layer; and/or the number of the groups of groups,
The surface of the second layer is provided with an ultraviolet-resistant coating; and/or the number of the groups of groups,
The color of the second layer is the same as or similar to the color of the light-receiving surface of the battery piece.
14. The photovoltaic module of claim 12, wherein the insulating strip further comprises a third layer, the first, second and third layers being disposed in overlapping relation and any adjacent two layers being affixed to each other;
The third layer is a composite layer of an ethylene-vinyl acetate copolymer layer, a polyolefin elastomer layer, an ethylene-vinyl acetate copolymer layer and a polyolefin elastomer layer.
15. The photovoltaic module of claim 14, wherein the first layer has a thickness of 20um to 200um; and/or the thickness of the second layer is 20um-200um; and/or the thickness of the third layer is 20um-200um.
16. The photovoltaic assembly of claim 1, further comprising a positioning tape bonded to the jumper or insulating strip, the positioning tape further bonded to a cell backlight surface.
17. The photovoltaic module of claim 16, wherein in the second direction, two ends of the positioning tape are bonded to the backlight surfaces of the battery cells on two sides of the jumper, respectively, and a portion between the two ends of the positioning tape is bonded to the jumper and the insulating strip.
18. The photovoltaic module of claim 16, wherein the jumper is provided with at least one positioning tape that bonds to the cell backlight surface to form a bond point that is disposed between 2-6 cells in the first direction from the central bus bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322552171.2U CN221041145U (en) | 2023-09-19 | 2023-09-19 | Photovoltaic module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322552171.2U CN221041145U (en) | 2023-09-19 | 2023-09-19 | Photovoltaic module |
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| Publication Number | Publication Date |
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| CN221041145U true CN221041145U (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322552171.2U Active CN221041145U (en) | 2023-09-19 | 2023-09-19 | Photovoltaic module |
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| Country | Link |
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| CN (1) | CN221041145U (en) |
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