Photovoltaic module

Abstract

The utility model relates to the field of photovoltaic technology, and especially relates to a photovoltaic assembly. The photovoltaic module includes a battery cell. Wherein the battery unit comprises a plurality of battery strings which are sequentially arranged in the second direction, each battery string comprises a plurality of battery pieces which are sequentially connected in series in the first direction, and the first direction is perpendicular to the second direction; the battery piece is a back contact battery. The battery cell also includes a plurality of first solder strips, a plurality of second solder strips, and a plurality of third solder strips. In the first direction, a first interval is formed between every two adjacent first welding strips, and a second interval is formed between every two adjacent second welding strips. And the third welding strip is welded with the first welding strip or the second welding strip. And the third welding strip is laid on the back surface of the battery piece and extends along the second direction, and the third welding strip is configured to connect the whole battery string in parallel. The photovoltaic module can reduce the generation of a hot spot effect, improves the generation power of the photovoltaic module, delays the aging of the photovoltaic module, and prolongs the service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially relates to a photovoltaic module. BACKGROUND

[0002] Back contact cell (abbreviated as BC cell) adopts main grid line free design, realizes the full area effective utilization of cell piece light receiving surface by whole back placement treatment of front electrode structure. This unique electrode arrangement mode effectively improves the capture area of incident light, significantly enhances the photoelectric conversion performance of the module, and shows significant advantages in photovoltaic system energy output.

[0003] At present, the mainstream BC cell photovoltaic module generally adopts series cell arrangement architecture, and this topology structure will cause significant power loss when encountering local shading conditions. Especially, the built-in bypass protection mechanism in the prior art can form a current path at the physical level, but the bypass conduction will generate an abnormally high density current inside the cell unit, and then cause the accumulation of Joule heat effect. Experimental data show that the local temperature of the BC cell photovoltaic module with traditional series arrangement can climb above 145 DEG C under the thermal spot effect. This persistent high temperature environment will cause irreversible delamination of the packaging material interface, and accelerate the thermal aging effect of the polymer material such as EVA film. More seriously, repeated thermal stress impact will cause the secondary risk of cell hidden cracks, and finally cause the power output of the photovoltaic module to show nonlinear decay characteristics.

[0004] Therefore, the BC cell photovoltaic module currently seen has a certain cell level bypass effect compared with conventional PERC / TOPCON / HIT cell photovoltaic modules, but it is also a potential leakage current risk. In addition, the BC cell is designed in a way that the positive and negative electrodes are alternately arranged on the back, and as the number of electrode grid lines increases, the spacing between the positive and negative electrodes becomes smaller, which poses more stringent challenges and requirements on the manufacturing process, insulation treatment, etc. Superimposed shading on the front will increase the potential reliability of leakage current and reduce the power generation of the power station end of the conventional module product, ultimately forming the deficiency of the BC cell module product.

[0005] Therefore, it is urgent to design a photovoltaic module to solve the above technical problems. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a photovoltaic module, which can reduce the generation of hot spot effect, improve the power generation of the photovoltaic module and prolong the service life.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] The utility model provides a kind of photovoltaic module, comprising:

[0009] Battery unit, the battery unit includes multiple battery strings sequentially arranged along the second direction, each battery string includes multiple battery pieces sequentially connected in series along the first direction, the first direction and the second direction are perpendicular to each other;The battery piece is back contact battery;

[0010] The battery unit further includes multiple first solder strips, multiple second solder strips and multiple third solder strips, the first solder strip and the second solder strip are alternately arranged along the second direction;Three battery pieces sequentially arranged along the first direction in the same battery string are defined as battery piece A, battery piece B and battery piece C, the first solder strip is used to connect the battery piece A and the battery piece B in series, and the second solder strip is used to connect the battery piece B and the battery piece C in series;

[0011] Along the first direction, there is a first interval between two adjacent first solder strips, and there is a second interval between two adjacent second solder strips;

[0012] The third solder strip is welded and connected with the first solder strip or the second solder strip, when the third solder strip is welded and connected with the first solder strip, the third solder strip is placed in the second interval;When the third solder strip is welded and connected with the second solder strip, the third solder strip is placed in the first interval;The third solder strip is laid on the back of the battery piece and extends along the second direction, and the third solder strip is configured to connect two adjacent battery strings in parallel.

[0013] As an optional technical solution of a photovoltaic module, the photovoltaic module further includes an insulating pad strip, the insulating pad strip is arranged between the battery piece and the first solder strip, and between the battery piece and the second solder strip;And the insulating pad strip is located between two adjacent battery pieces, one side of the insulating pad strip is connected with one of the battery pieces, and the other side is connected with another battery piece;The insulating pad strip extends along the second direction.

[0014] As an optional technical solution of a photovoltaic module, the third solder strip is located above the first solder strip or the second solder strip.

[0015] As an optional technical solution of a photovoltaic module, the third solder strip is located between the insulating pad strip and the first solder strip, or the third solder strip is located between the insulating pad strip and the second solder strip.

[0016] As an optional technical solution of a photovoltaic module, the width of the third solder strip along the first direction does not exceed the width range of the insulating pad strip along the first direction, and the length of the third solder strip along the second direction does not exceed the length range of the insulating pad strip along the second direction.

[0017] As an optional technical solution of the photovoltaic module, the back surface of the cell piece is formed with positive grid lines and negative grid lines, and the positive grid lines and the negative grid lines are arranged alternately along the second direction.

[0018] The three cell pieces arranged in sequence along the first direction in the same cell string are defined as cell piece A, cell piece B and cell piece C; one end of the first welding strip is connected with the positive grid line of the cell piece A, the other end of the first welding strip is connected with the negative grid line of the cell piece B, one end of the second welding strip is connected with the positive grid line of the cell piece B, and the other end of the second welding strip is connected with the negative grid line of the cell piece C, so that the cell piece A, the cell piece B and the cell piece C are connected in sequence.

[0019] As an optional technical solution of the photovoltaic module, the photovoltaic module further comprises two bus bars, two bus bars are located on opposite sides of the cell unit, and two bus bars extend along the second direction; one of the bus bars is connected with the first welding strip, and the other bus bar is connected with the second welding strip.

[0020] As an optional technical solution of the photovoltaic module, the bus bar is provided with a lead-out wire, and the photovoltaic module further comprises a junction box, and the lead-out wire is in conductive communication with the junction box. As the photovoltaic module has two lead-out wires, one positive and one negative, corresponding to two separate junction boxes.

[0021] As an optional technical solution of the photovoltaic module, the photovoltaic module further comprises a front panel, a front adhesive film, a back adhesive film and a back panel, one side of the front adhesive film is bonded with the front panel, and the other side is bonded with the cell unit, one side of the back adhesive film is bonded with the cell unit away from the one side of the front adhesive film, and the other side is bonded with the back panel to form a laminated piece.

[0022] As an optional technical solution of the photovoltaic module, the photovoltaic module further comprises a frame, and the frame is mounted on the circumferential side of the laminated piece.

[0023] The beneficial effects of the present application at least include:

[0024] The utility model provides a kind of photovoltaic module, which comprises a cell unit. The cell unit includes a plurality of cell strings arranged in a second direction. Each cell string includes a plurality of cell pieces connected in series in a first direction. The first direction and the second direction are perpendicular to each other. The cell pieces are back contact cells. The cell unit further includes a plurality of first solder strips, a plurality of second solder strips and a plurality of third solder strips. The first solder strips and the second solder strips are alternately arranged in the second direction. Three cell pieces arranged in the first direction in the same cell string are defined as cell piece A, cell piece B and cell piece C. The first solder strips are used to connect cell piece A and cell piece B in series. The second solder strips are used to connect cell piece B and cell piece C in series. The same purpose of connecting all cell pieces in series in the same cell string is achieved by analogy. In the first direction, there is a first interval between two adjacent first solder strips, and a second interval between two adjacent second solder strips. The third solder strips are connected to the first solder strips or the second solder strips. When the third solder strips are connected to the first solder strips, the third solder strips are placed in the second interval, thereby avoiding the short circuit problem caused by the connection of the third solder strips and the second solder strips. When the third solder strips are connected to the second solder strips, the third solder strips are placed in the first interval, thereby avoiding the short circuit problem caused by the contact of the third solder strips and the first solder strips. The third solder strips are laid on the back of the cell pieces and extend in the second direction. The third solder strips are configured to connect two adjacent cell strings in parallel.

[0025] Compared with the prior art, the utility model connects a plurality of cell pieces in series by the first solder strips and the second solder strips and forms a plurality of cell strings. The plurality of cell strings are connected in parallel by the third solder strips, thereby forming a plurality of independent current branches in the cell unit. When the current of a branch decreases due to the shading of a cell piece, the other branches can still maintain the original current output capacity. Specifically, in the traditional series structure, when a cell piece is shaded, the current of the entire series circuit is limited by the shaded cell, resulting in a decrease in power. The bypass diode in the traditional technology provides a bypass to bypass the shaded cell piece when this situation occurs, but the bypass diode itself has the problems of large current and high heat generation. The cell unit in the present application uses a parallel connection, so when a cell piece is shaded, the other branches can still generate electricity normally, and the current will not flow through the shaded branch, so a bypass diode is not needed to shunt. Because the parallel structure itself allows the current to flow through other paths, it naturally bypasses the shaded part, so the present application does not need to add a bypass diode.

[0026] In addition, in the traditional series structure, the shaded battery piece consumes power and generates high temperature. In the parallel structure of the application, a physical parallel and series battery piece structure is actually established, forming multiple channels of current output, and the current can flow through different paths. In other words, when the battery piece in a certain battery string is shaded or damaged, the current can flow through other current branches at this time, thereby avoiding or mitigating the hot spot effect. It helps to reduce the temperature of the hot spot, reduce the damage of the hot spot to the photovoltaic module, improve the power generation power of the photovoltaic module, delay the aging of the photovoltaic module, and prolong the service life. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present application and these drawings without creative labor.

[0028] Figure 1 is a structural schematic diagram of a battery unit provided by the embodiments of the present application;

[0029] Figure 2 is a side view of a battery unit provided by the embodiments of the present application Figure 1 ;

[0030] Figure 3 is a side view of a battery unit provided by the embodiments of the present application Figure 2 ;

[0031] Figure 4 is a sectional view of a laminated piece provided by the embodiments of the present application;

[0032] Figure 5 is a schematic diagram of the arrangement of three adjacent battery pieces in a battery string provided by the embodiments of the present application;

[0033] Figure 6 is an exploded view of a photovoltaic module provided by the embodiments of the present application.

[0034] REFERENCE NUMERALS

[0035] 100, battery string; 110, battery piece; 1101, battery piece A; 1102, battery piece B; 1103, battery piece C; 1104, positive grid line; 1105, negative grid line;

[0036] 200, first solder strip; 210, first interval;

[0037] 300, second solder strip; 310, second interval;

[0038] 400, third solder strip;

[0039] 500, insulating pad strip;

[0040] 600, bus bar; 610, lead-out wire; 700, terminal box;

[0041] 800, laminated piece; 810, front panel; 820, front adhesive film; 830, back adhesive film; 840, back panel; 900, frame. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0044] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0045] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0046] In the description of the utility model, still need to explain, unless another explicit provision and limitation, term "arrange", "connect" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect, can be mechanical connection, also can be electrical connection. For ordinary skilled in the art, can understand the concrete meaning of the above terms in the utility model according to specific circumstances.

[0047] In the utility model, unless another explicit provision and limitation, first feature is "on" or "under" second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but are in contact through another feature between them. Moreover, first feature is "on", "above" and "on" second feature includes that first feature is directly above and obliquely above second feature, or just indicates that the horizontal height of first feature is higher than second feature. First feature is "under", "below" and "under" second feature includes that first feature is directly below and obliquely below second feature, or just indicates that the horizontal height of first feature is less than second feature.

[0048] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as a limitation on the utility model.

[0049] The embodiment provides a photovoltaic module, which can reduce the generation of hot spot effect, improve the power generation of the photovoltaic module and prolong the service life.

[0050] As shown in Figures 1-3 The photovoltaic module mainly includes a cell unit. The cell unit includes a plurality of cell strings 100 arranged in a second direction in sequence, each cell string 100 includes a plurality of cell pieces 110 connected in a first direction in sequence, the first direction and the second direction are perpendicular to each other; the cell piece 110 is a back contact cell. The cell unit further includes a plurality of first solder strips 200, a plurality of second solder strips 300 and a plurality of third solder strips 400. The first solder strip 200 and the second solder strip 300 are arranged alternately along the second direction; defining three cell pieces 110 arranged in the first direction in sequence in the same cell string 100 as cell piece A, cell piece B and cell piece C, the first solder strip 200 is used for connecting the cell piece A and the cell piece B in series, the second solder strip 300 is used for connecting the cell piece B and the cell piece C in series, and the series connection of all cell pieces 110 in the same cell string 100 is realized in sequence.

[0051] Specifically, in one battery string 100, a plurality of battery pieces 110 are arranged in sequence along a first direction, wherein the first welding strip 200 connects the first battery piece 110 and the second battery piece 110, the third battery piece 110 and the fourth battery piece 110, the fifth battery piece 110 and the sixth battery piece 110, and so on in series; the second welding strip 300 connects the second battery piece 110 and the third battery piece 110, the fourth battery piece 110 and the fifth battery piece 110, and so on in series, to achieve the purpose of series connection of all battery pieces 110 in the same battery string 100.

[0052] Along the first direction, there is a first interval 210 between the two adjacent first welding strips 200, and a second interval 310 between the two adjacent second welding strips 300. The third welding strip 400 is welded to the first welding strip 200 or the second welding strip 300. When the third welding strip 400 is welded to the first welding strip 200, the third welding strip 400 is placed in the second interval 310, thereby avoiding the short circuit problem caused by the connection of the third welding strip 400 and the second welding strip 300 at this time. When the third welding strip 400 is welded to the second welding strip 300, the third welding strip 400 is placed in the first interval 210, thereby avoiding the short circuit problem caused by the contact of the third welding strip 400 and the first welding strip 200 at this time. The third welding strip 400 is laid on the back of the battery piece 110 and extends along the second direction, and the third welding strip 400 is configured to connect the whole battery string 100 in parallel.

[0053] Compared with the prior art, in the embodiment, the plurality of battery pieces 110 are sequentially connected in series by the first welding strip 200 and the second welding strip 300 to form a plurality of battery strings 100, and the plurality of battery strings 100 are connected in parallel by the third welding strip 400, thereby forming a plurality of independent current branches in the battery unit, and the output current thereof follows the superposition of Kirchhoff's law. When the current of a branch decreases due to the shielding of a battery piece 110, the other branches can still maintain the original current output capability. Specifically, in the traditional series connection structure, when a battery piece 110 is shielded, the current of the whole series circuit is limited by the shielded battery, resulting in a decrease in power. The role of the bypass diode in the conventional technology is to provide a bypass in this case to allow the current to bypass the shielded battery piece 110, but the bypass diode itself has the problems of large current and high heat generation. The battery unit in the present application adopts a parallel connection mode, and when one battery piece 110 is shielded, the other branches can still generate electricity normally, and the current will not flow through the shielded branch, so there is no need for a bypass diode to shunt. Because the parallel structure itself allows the current to pass through other paths, it naturally bypasses the shielded part, so the present application does not need to add an additional bypass diode.

[0054] In addition, in the traditional series structure, the shaded cell 110 will consume power and generate high temperature. In the parallel structure of the present application, the current can flow through different paths. Specifically, when a cell 110 in a certain battery string 100 is shaded or damaged, the current can flow through other parallel battery strings 100 (i.e., through other current branches) at this time, thereby avoiding or mitigating the hot spot effect. This helps to reduce the temperature of the hot spot, reduce the damage of the hot spot to the photovoltaic module, improve the power generation of the photovoltaic module, delay the aging of the photovoltaic module, and prolong the service life.

[0055] Based on the physical multi-channel current delivery design, the optimal photovoltaic panel-based power station installation design can maximize the use of sunlight and maximize the power generation of the photovoltaic module. It can also avoid the shortcoming of insufficient leakage current source of the cell 110, improve the power generation of the photovoltaic module, and prolong the service life. In the design of photovoltaic power stations, especially large ground power stations, based on the horizontal photovoltaic module fixed support installation method, under the condition of early and late partial shading, as long as there is sunlight, the current can be output best. The maximum use of sunlight is realized, and the investment return of the photovoltaic power station is optimized.

[0056] It should be noted that the first direction in the embodiment is the X-axis direction in Figure 1 , and the second direction is the Y-axis direction in Figure 1 .

[0057] Through experiments, the comparison between the photovoltaic module in the embodiment and the photovoltaic module in the prior art in different parameter performances is shown in Table 1 as follows:

[0058] Table 1

[0059] Parameter Conventional series structure Multi-string parallel structure of the present application Number of bypass diodes 1-2 per string 0 (completely omitted) Hot spot peak temperature 145℃ <100℃

[0060] As shown in Figures 1-3 , the first solder strip 200 in the embodiment is connected in series with two adjacent cells 110, and the two ends (i.e., the starting end and the ending end) of the first solder strip 200 are kept apart from the edges of the cell 110 by a gap M. Similarly, the two ends (i.e., the starting end and the ending end) of the second solder strip 300 are kept apart from the edges of the cell 110 by a gap M. In this way, the edge stress concentration that causes the cell to crack or break can be prevented. At the same time, the phenomenon of short circuit caused by the simultaneous contact of the first solder strip 200, the second solder strip 300, and the third solder strip can also be avoided.

[0061] Furthermore, high temperatures are generated during the welding of the first solder strip 200 and the second solder strip 300 (such as infrared welding or soldering). If the starting or ending point of the welding is too close to the edge of the battery, it may cause localized overheating at the edge of the battery cell 110. The edge area of ​​the battery cell 110 has low mechanical strength (micro-cracks exist after cutting), and high temperatures will exacerbate the risk of microcracks in the battery cell 110.

[0062] For example, the gap M can be set to 1mm to 5mm.

[0063] like Figures 1-3 As shown, in this embodiment, the photovoltaic module further includes an insulating strip 500, which is disposed between the cell 110 and the first solder strip 200, and between the cell 110 and the second solder strip 300; and the insulating strip 500 is located at the position of the first interval 210 or the second interval 310, with one side of the insulating strip 500 connected to one of the cell 110 and the other side connected to another cell 110; the insulating strip 500 extends along a second direction.

[0064] The insulating pad 500 prevents the third welding strip 400 from contacting the battery cell 110 and causing a short circuit, thus improving safety. It also provides structural support for the third welding strip 400, thereby improving the stability and reliability of welding the third welding strip 400 to the first welding strip 200 or the second welding strip 300.

[0065] Alternatively, the insulating strip 500 is manufactured by encapsulating a polyimide, EPE, or PET film.

[0066] Optionally, such as Figure 2 As shown, the third solder strip 400 is located above the first solder strip 200 or the second solder strip 300 and is soldered to the first solder strip 200 or the second solder strip 300 to form a parallel circuit. At this time, the third solder strip 400 is external to the first solder strip 200 and the second solder strip 300.

[0067] Of course, the third solder strip 400 can also be incorporated within the first solder strip 200 and the second solder strip 300, such as... Figure 3 As shown, the third solder strip 400 is located between the insulating pad 500 and the first solder strip 200, or the third solder strip 400 is located between the insulating pad 500 and the second solder strip 300. In this case, the third solder strip 400 is soldered to either the first solder strip 200 or the second solder strip 300 to form a parallel circuit. It is understood that... Figure 2 and Figure 3 Only the welding relationship between the third weld strip 400 and the first weld strip 200 is shown.

[0068] Optionally, in some optional embodiments, the insulating pad strip 500 can be integrally formed with the third solder strip 400 to form a composite component, thereby improving the work efficiency of laying.

[0069] The operator can choose to place the third solder strip 400 under the first solder strip 200 and the second solder strip 300 or above the first solder strip 200 and the second solder strip 300 according to actual needs, which will not be described in detail here.

[0070] The width of the third solder strip 400 in the first direction in the embodiment does not exceed the width range of the insulating pad strip 500 in the first direction, and the length of the third solder strip 400 in the second direction does not exceed the length range of the insulating pad strip 500 in the second direction, preventing the third solder strip 400 from directly contacting the battery piece 110 and causing a short circuit, thereby improving safety.

[0071] As shown in the example, Figure 5 The back of the battery piece 110 in the embodiment is formed with positive and negative grid lines, and the positive and negative grid lines are alternately arranged in the second direction. Define three battery pieces 110 arranged in the first direction in the same battery string 100 as battery piece A1101, battery piece B1102 and battery piece C1103; one end of the first solder strip 200 is connected with the positive grid line 1104 of the battery piece A1101, the other end of the first solder strip 200 is connected with the negative grid line 1105 of the battery piece B1102, one end of the second solder strip 300 is connected with the positive grid line 1104 of the battery piece B1102, and the other end of the second solder strip 300 is connected with the negative grid line 1105 of the battery piece C1103, so that the battery piece A1101, the battery piece B1102 and the battery piece C1103 are connected in series. It can be understood that when the number of battery pieces 110 in the battery string 100 is greater than three, the first solder strip 200 and the second solder strip 300 can be used in the above manner to achieve the purpose of connecting multiple battery pieces 110 in series.

[0072] As shown in the example, Figure 5 The positive grid line 1104 in the embodiment is represented by a solid line, and the negative grid line 1105 is represented by a dashed line. The electrode positions of the battery piece A1101 and the battery piece C1103 are consistent, and the electrode positions of the battery piece B1102 are opposite to those of the battery piece A1101 and the battery piece C1103. That is, the battery piece A1101 has positive grid lines 1104 in the odd rows and negative grid lines 1105 in the even rows, and the battery piece B1102 has negative grid lines 1105 in the odd rows and positive grid lines 1104 in the even rows.

[0073] As shown in the example, Figure 1 , Figures 4-6As shown, the photovoltaic module in the embodiment further includes two busbars 600, the two busbars 600 are respectively located at opposite sides of the cell units, and the two busbars 600 both extend along the second direction; one of the busbars 600 is connected with the first solder strip 200, and the other busbar 600 is connected with the second solder strip 300. The busbar 600 is provided with a lead-out wire 610, and the photovoltaic module further includes a junction box 700, and the lead-out wire 610 is in conductive communication with the junction box 700.

[0074] The current generated in the cell units can be transmitted to the junction box 700 in sequence through the busbar 600 and the lead-out wire 610, the junction box 700 is connected with an inverter, and the inverter can convert the direct current generated by the photovoltaic module, so as to convert the direct current into alternating current for use. Of course, the junction box 700 can also be directly connected with a direct current electrical equipment.

[0075] The junction box 700 in the embodiment does not need to be provided with a bypass diode, the number of each string of cell pieces 110 and the number of the cell strings 100 can be flexibly designed according to the actual version of the photovoltaic module, and the compatibility is improved.

[0076] The cell piece 110 in the embodiment can be set as a multi-piece cell piece, for example, a two-piece cell piece, a three-piece cell piece, a four-piece cell piece, a five-piece cell piece, and the like.

[0077] Optionally, the inter-piece spacing between the adjacent two cell pieces 110 is generally set to be between 0.5mm and 2mm, and in some optional embodiments, when the conversion efficiency of the photovoltaic module is pursued to the extreme, the inter-piece spacing between the adjacent two cell pieces 110 can be set to be negative, for example, set to be between -0.5mm and -2mm. In other words, the adjacent two cell pieces 110 are set to be laminated.

[0078] Optionally, in some optional embodiments, the edge of the cell piece 110 is passivated to form an insulator, so that the cell piece 110 can be relatively close, and thus the laminated setting is not needed.

[0079] As shown in FIG. 1, the photovoltaic module includes a plurality of cell strings 100, and each cell string 100 includes a plurality of cell pieces 110. Figures 4-6As shown, the photovoltaic module further comprises a front panel 810, a front adhesive film 820, a back adhesive film 830 and a back panel 840, one side of the front adhesive film 820 is bonded with the front panel 810, and the other side is bonded with the cell unit, one side of the back adhesive film 830 is bonded with the cell unit away from the one side of the front adhesive film 820, and the other side is bonded with the back panel 840 and forms the laminated piece 800. In other words, the back panel 840, the back adhesive film 830, the cell unit, the front adhesive film 820 and the front panel 810 are stacked in turn, and then form the laminated piece 800 through a laminating process. The photovoltaic module further comprises a frame 900, the frame 900 is installed on the circumferential side of the laminated piece 800, the frame 900 can protect the four sides of the laminated piece 800, improve the mechanical strength of the photovoltaic module, and prolong the service life.

[0080] Further, the front panel 810 and the back panel 820 in the embodiment are not necessarily both glass materials, but any material having a protection function can be used. However, the front panel 810 must be a transparent material to facilitate light transmission through the front panel 810, and the back panel 820 is not limited to a transparent material.

[0081] Obviously, the above only describes preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

[0082] Note that in the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A photovoltaic module, characterized by, The photovoltaic module comprises: a battery unit comprising a plurality of battery strings (100) arranged in sequence along a second direction, each of the battery strings (100) comprising a plurality of battery pieces (110) connected in sequence along a first direction, the first direction and the second direction being perpendicular to each other; the battery piece (110) being a back contact battery; the battery unit further comprises a plurality of first solder strips (200), a plurality of second solder strips (300) and a plurality of third solder strips (400), the first solder strips (200) and the second solder strips (300) being arranged alternately along the second direction; defining three battery pieces (110) arranged in sequence along the first direction in the same battery string (100) as battery piece A, battery piece B and battery piece C, the first solder strip (200) being used to connect the battery piece A and the battery piece B in series, the second solder strip (300) being used to connect the battery piece B and the battery piece C in series; along the first direction, there is a first interval (210) between two adjacent first solder strips (200), and a second interval (310) between two adjacent second solder strips (300); the third solder strip (400) is welded to the first solder strip (200) or the second solder strip (300), when the third solder strip (400) is welded to the first solder strip (200), the third solder strip (400) is located in the second interval (310); when the third solder strip (400) is welded to the second solder strip (300), the third solder strip (400) is located in the first interval (210); the third solder strip (400) is laid on the back of the battery piece (110) and extends along the second direction, and the third solder strip (400) is configured to connect two adjacent battery strings (100) in parallel.

2. The photovoltaic module of claim 1, wherein, The photovoltaic module further comprises an insulating pad (500) arranged between the battery piece (110) and the first solder strip (200), and between the battery piece (110) and the second solder strip (300); and the insulating pad (500) is located at the position of the first interval (210) or the second interval (310), one side of the insulating pad (500) is connected to one of the battery pieces (110), and the other side is connected to another of the battery pieces (110); the insulating pad (500) extends along the second direction.

3. The photovoltaic module of claim 2, wherein, The third solder strip (400) is located above the first solder strip (200) or the second solder strip (300).

4. The photovoltaic module of claim 2, wherein, The third solder strip (400) is located between the insulating pad (500) and the first solder strip (200), or the third solder strip (400) is located between the insulating pad (500) and the second solder strip (300).

5. The photovoltaic module of claim 2, wherein, The width of the third solder strip (400) along the first direction does not exceed the width range of the insulating pad (500) along the first direction, and the length of the third solder strip (400) along the second direction does not exceed the length range of the insulating pad (500) along the second direction.

6. The photovoltaic module of claim 1, wherein, The back surface of the battery piece (110) is formed with positive and negative grid lines, and the positive and negative grid lines are arranged alternately along the second direction; Three battery pieces (110) arranged in sequence along the first direction in the same battery string (100) are defined as battery piece A, battery piece B and battery piece C; one end of the first welding strip (200) is connected with the positive grid line of the battery piece A, the other end of the first welding strip (200) is connected with the negative grid line of the battery piece B, one end of the second welding strip (300) is connected with the positive grid line of the battery piece B, and the other end of the second welding strip (300) is connected with the negative grid line of the battery piece C, so that the battery piece A, the battery piece B and the battery piece C are connected in sequence.

7. The photovoltaic module of claim 1, wherein, The photovoltaic module further comprises two bus bars (600), and the two bus bars (600) are respectively located on opposite sides of the battery unit and extend along the second direction; one of the bus bars (600) is connected with the first welding strip (200), and the other bus bar (600) is connected with the second welding strip (300).

8. The photovoltaic module of claim 7, wherein, The bus bar (600) is provided with a lead-out wire (610), and the photovoltaic module further comprises a junction box (700), and the lead-out wire (610) is in conductive communication with the junction box (700).

9. The photovoltaic module of any of claims 1-8, wherein, The photovoltaic module further comprises a front panel (810), a front adhesive film (820), a back adhesive film (830) and a back panel (840), one side of the front adhesive film (820) is bonded with the front panel (810), and the other side is bonded with the battery unit, one side of the back adhesive film (830) is bonded with the battery unit away from the one side of the front adhesive film (820), and the other side is bonded with the back panel (840) to form a laminated piece (800).

10. The photovoltaic module of claim 9, wherein, The photovoltaic module further comprises a frame (900), and the frame (900) is mounted on the periphery of the laminated piece (800).

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