Photovoltaic module and photovoltaic system

Abstract

The utility model provides a photovoltaic assembly and a photovoltaic system, the photovoltaic assembly comprises at least one battery string, and the battery string comprises battery pieces and interconnection strips; the first surface of the battery piece is provided with first electrodes and second electrodes, the first electrodes and the second electrodes are sequentially and alternately arranged at intervals in the first direction and extend in the second direction, and the first electrodes and the second electrodes are provided with joint parts; the interconnection strips extend along the first direction and are connected in series with the joint parts, arranged on different electrodes, of the at least two battery pieces; an insulating layer is further arranged on the first surface of the battery piece, the insulating layer covers the parts, corresponding to the joint parts of the opposite electrodes, of the first electrode and the second electrode in the first direction, and the two ends, in the second direction, of the insulating layer protrude out of the joint parts in the second direction; wherein the size x of the part, protruding out of the joint part, of any end of the insulating layer meets the condition that x is larger than 0.8 d-0. 1 mm and smaller than 1.2 d + 0.1 mm, and d represents the width of the interconnecting strip.

Description

Technical Field

[0001] At least one embodiment of the present utility model relates to the field of photovoltaic technology, and in particular to a photovoltaic module and a photovoltaic system. Background Art

[0002] In a back-contact battery, the positive electrode and the negative electrode are both arranged on the back of the battery cell. To this end, the electrodes need to be arranged on different doping areas of the battery cell to form a positive electrode or a negative electrode, and then connected to the joints set on the electrodes through corresponding interconnection strips to form a battery string with other battery cells.

[0003] To prevent short circuits caused by simultaneous connection of the same interconnect bar to the positive and negative electrodes of the same cell, an insulating layer is required between the interconnect bar and the electrodes of different polarities. Designing this insulating layer is crucial for preventing short circuits during the cell electrical connection process. Utility Model Content

[0004] To solve at least one of the above and other technical problems in the prior art, the present invention provides a photovoltaic module and a photovoltaic system, insulating the positive electrode and the negative electrode from the overlapping parts of the interconnection strips of different polarities by designing the insulating layer.

[0005] An embodiment of the present invention provides a photovoltaic module, comprising at least one battery string, wherein the battery string comprises battery cells and interconnecting strips; a first electrode and a second electrode are provided on the first surface of the battery cell, and the first electrode and the second electrode are alternately arranged in sequence along a first direction and extend along a second direction, the second direction intersecting the first direction, and a joint portion is provided on both the first electrode and the second electrode; the interconnecting strip extends along the first direction, connecting in series the joint portions of at least two battery cells arranged on different electrodes; an insulating layer is further provided on the first surface of the battery cell, the insulating layer covers portions of the first electrode and the second electrode corresponding to the joint portions of opposite-polarity electrodes along the first direction, and both ends of the insulating layer along the second direction protrude from the joint portion in the second direction; wherein the size of the portion of either end of the insulating layer protruding from the joint portion is x, satisfying 0.8d-0.1mm<x<1.2d+0.1mm, and d represents the width of the interconnecting strip along the second direction.

[0006] According to an embodiment of the present invention, the size of a portion of any end of the insulating layer protruding from the joint portion satisfies d-0.1mm≤x≤d+0.1mm.

[0007] According to an embodiment of the present invention, the size of a portion of either end of the insulating layer protruding from the joint portion satisfies 0.38 mm < x < 0.82 mm.

[0008] According to an embodiment of the present invention, the length of the insulating layer along the second direction is 1-3 mm.

[0009] According to an embodiment of the present invention, the width of the above-mentioned insulating layer along the above-mentioned first direction is y, satisfying b+65μm≤y≤D-55μm, b represents the width of the above-mentioned second electrode along the above-mentioned first direction, and D represents the spacing between the above-mentioned joints located on both sides of the above-mentioned insulating layer along the above-mentioned first direction.

[0010] According to an embodiment of the present invention, the width of the insulating layer along the first direction is configured to satisfy 0.2 mm ≤ y ≤ 0.6 mm.

[0011] According to an embodiment of the present invention, the thickness z of the insulating layer along the third direction satisfies z≥h+18μm, where h represents the thickness of the second electrode along the third direction, and the third direction is orthogonal to both the first direction and the second direction.

[0012] According to an embodiment of the present invention, the thickness of the insulating layer along the third direction satisfies 20 μm≤z≤60 μm.

[0013] According to an embodiment of the present invention, a thickness of the insulating layer along the third direction is smaller than a sum of a thickness of the colloid disposed between the joint portion and the interconnecting strip and a thickness of the joint portion.

[0014] According to an embodiment of the present invention, in an orthographic projection along a third direction, a projection of the first electrode or the second electrode at least partially overlaps with a projection of the joint portion, and the third direction is orthogonal to both the first direction and the second direction.

[0015] An embodiment of the present invention further provides a photovoltaic system, which includes a plurality of the above-mentioned photovoltaic modules.

[0016] According to the photovoltaic module and photovoltaic system provided by the utility model, by setting the two ends of the insulating layer along the second direction to protrude from the joint, and designing the part protruding from the joint to satisfy 0.8d-0.1mm<x<1.2d+0.1mm, x represents the size of the protruding part at either end, and d represents the width of the interconnection bar along the above-mentioned second direction, it is beneficial to compensate for the offset of the interconnection bar relative to the joint due to equipment accuracy, etc., so as to more effectively prevent short circuits caused by the interconnection bar contacting the opposite-sex joint and the gate line. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a photovoltaic assembly according to an exemplary embodiment of the present invention from a top view;

[0018] Figure 2 yes Figure 1 A schematic diagram of the interconnection strip of the exemplary embodiment shown is in a first offset state;

[0019] Figure 3 yes Figure 1 A schematic diagram of the interconnection strip of the exemplary embodiment shown is in a second offset state;

[0020] Figure 4 yes Figure 1 a partially enlarged view of portion A of the illustrated exemplary embodiment; and

[0021] Figure 5 yes Figure 4 A partial cross-sectional view of section BB of the exemplary embodiment is shown.

[0022] In the drawings, the meanings of the reference numerals are as follows:

[0023] 1. Interconnection strip;

[0024] 2. Insulation layer;

[0025] 3. a first electrode;

[0026] 4. a second electrode;

[0027] 5. Joints; and

[0028] 6. Battery cells. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0030] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the presence of the features, steps, operations and / or components, but do not exclude the presence or addition of one or more other features, steps, operations or components.

[0031] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0032] When expressions such as “at least one of A, B, and C, etc.” are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, “a system having at least one of A, B, and C” should include but is not limited to systems having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, and C, etc. When expressions such as “at least one of A, B, or C, etc.” are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, “a system having at least one of A, B, or C” should include but is not limited to systems having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, and C, etc.

[0033] Back-contact cells (BC cells), with both positive and negative electrodes located on the back of the cell, can reduce the metal electrode footprint on the front of the cell, resulting in higher energy conversion efficiency. To connect the interdigitated positive and negative electrodes in series with the electrodes of other cells, the positive and negative electrodes can be configured as discontinuous structures to create disconnected sections that accommodate interconnecting strips. Alternatively, an insulating layer can be applied to the overlapped sections of the positive and negative electrodes in a continuous structure (e.g., connecting electrodes with disconnected sections via pads) with interconnecting strips (i.e., ribbons) of different polarities, insulating the interconnecting strips (i.e., ribbons) from the electrodes of different polarities to prevent short circuits.

[0034] The ideal way to set up the insulating layer for the positive electrode and negative electrode based on the continuous structure is to make the size of the insulating layer (including but not limited to the length) exactly consistent with the overlapping part of the interconnection bar (i.e., the welding strip) and the electrode of different polarity (i.e., the positive electrode or the negative electrode). However, in the actual manufacturing process, the interconnection bar often deviates relative to the joint (i.e., the pad). Therefore, the insulating layer can be optimized to compensate for the above-mentioned deviation to prevent the interconnection bar from short-circuiting with the electrodes of different polarity.

[0035] In view of this, how to provide a photovoltaic module that can compensate for the offset between the interconnection strip (ie, soldering ribbon) and the joint (ie, soldering pad) has become a technical problem that needs to be solved urgently.

[0036] Figure 1 It is a schematic diagram of a photovoltaic assembly according to an exemplary embodiment of the present invention from a top view.

[0037] The photovoltaic module provided by the present invention includes at least one battery string, which includes battery cells 6 and interconnection bars 1. The interconnection bars can be welding strips or other wires. The first surface of the battery cell 6 (such as the backlight side of the battery cell, i.e. Figure 1The first electrode 3 and the second electrode 4 are provided on the surface facing the viewing angle shown in the figure. The first electrode 3 and the second electrode 4 (also called fine grid, collector grid line, auxiliary grid, etc., which are used to extract the majority carriers of the doped region of the solar cell. The first electrode 3 and the second electrode 4 have different polarities) are provided along the first direction (such as Figure 1 The left and right directions shown in FIG) are alternately arranged in sequence and extend along the second direction. The second direction (as shown in FIG) Figure 1 The vertical direction shown in FIG1 intersects with the first direction. The first electrode 3 and the second electrode 4 are both provided with a joint 5. The interconnection bar 1 extends along the first direction, connecting the joints 5 provided on different electrodes of at least two battery cells 6 in series. The first surface of the battery cell 6 is also provided with an insulating layer 2 (i.e., Figure 1 Insulating layer 2 covers the portion of first electrode 3 and second electrode 4 along the first direction corresponding to the junction 5 of the opposite-sex electrodes, and both ends of insulating layer 2 along the second direction protrude beyond the junction 5 in the second direction. The dimension x of the portion of either end of insulating layer 2 protruding beyond the junction 5 satisfies 0.8d-0.1mm<x<1.2d+0.1mm, where d represents the width of interconnection strip 1 along the second direction.

[0038] Reference Figure 1 For clarity, only the insulating layer 2 provided on the second electrode 4 is shown. Similarly, an insulating layer 2 suitable for covering a portion of the first electrode 3 is also provided on the first electrode 3 adjacent to the joint 5 where the second electrode 4 is provided, so that the interconnection strip 1 connected to the joint 5 of the second electrode 4 is pressed against the insulating layer 2 to be insulated from the first electrode 3 of different polarity.

[0039] The following description will be made by taking the insulating layer 2 provided on the second electrode 4 as an example. In a preferred embodiment, the first electrode 3 is also provided with an insulating layer 2 provided on the second electrode 4. Figure 1 The insulating pieces shown are similar to the insulating layer 2.

[0040] In an illustrative embodiment, Figure 1 As shown, the first electrode 3 (i.e., the auxiliary grid) and the second electrode 4 (i.e., the auxiliary grid) are both provided on the first surface of the cell 6, which includes but is not limited to the backlight surface of the cell 6 (e.g., Figure 1 In detail, the first electrode 3 and the second electrode 4 are both formed along the second direction (such as Figure 1 The first electrode 3 and the second electrode 4 are configured with different polarities.

[0041] For example, a cell 6 based on n-type silicon has a p+ doped region and an n+ doped region disposed on its back side in parallel and spaced apart relation. The first electrode 3 disposed on and connected to the p+ doped region serves as the positive electrode (i.e., the positive sub-grid), while the second electrode 4 disposed on and connected to the n+ doped region serves as the negative electrode (i.e., the negative sub-grid).

[0042] Similarly, the first electrode 3 can also be arranged on the n+ doped region and connected to the n+ doped region to serve as a negative electrode; correspondingly, the second electrode 4 can also be arranged on the p+ doped region and connected to the p+ doped region to serve as a positive electrode.

[0043] In an illustrative embodiment, Figure 1 As shown, a plurality of bonding portions 5 (ie pads) are provided on the first electrode 3 and the second electrode 4, respectively. The plurality of bonding portions 5 extend along the second direction (eg Figure 1 The bonding portion 5 (ie, pad) provided on the first electrode 3 and the bonding portion 5 (ie, pad) provided on the second electrode 4 are spaced apart in the second direction (ie, Figure 1 In detail, the joint portion 5 (i.e., the pad) includes but is not limited to being configured as a rectangular structure. Further, an insulating layer 2 is provided on each second electrode 4, and the insulating layer 2 is staggered along the first direction (as shown in FIG. Figure 1 In the orthographic projection of the first electrode 3 (in the left and right directions as shown), the projection of the joint portion 5 on the first electrode 3 overlaps (for example, the projection of the joint portion 5 is located in the middle of the projection of the insulating layer 2). Similarly, an insulating layer 2 is also provided on each first electrode 3, and the insulating layer 2 is Figure 1 The orthographic projection of the junction portion 5 on the second electrode 4 (in the left and right directions shown) partially overlaps with the projection of the junction portion 5 located on the second electrode 4 (for example, the projection of the junction portion 5 is located in the middle of the projection of the insulating layer 2). The above exemplary embodiment shows a battery structure without a busbar, but it should be understood that the embodiments of the present invention are not limited thereto.

[0044] For example, a plurality of busbars (not shown) of different polarities may be provided on the first surface of the cell 6 to collect the current collected by the first electrode 3 or the second electrode 4. Each busbar extending along the first direction is connected and electrically connected to a secondary grid of the same polarity (i.e., the first electrode 3 or the second electrode 4), passes through the insulating layer on the secondary grid of different polarity, and the aforementioned junction 5 may be formed on the busbar.

[0045] In an illustrative embodiment, Figure 1 As shown, the interconnection strip 1 (ie, the soldering strip) is connected to the first direction (eg Figure 1 The left and right directions shown in FIG. 2 are provided on the joint portion 5 (ie, the pad) and are pressed against the joint portion 5 adjacent to the joint portion 5 along the first direction (ie, as shown in FIG. Figure 1 The crimping indicates that the interconnection bar 1, the insulating layer 2 and the electrodes of different polarities (such as the first electrode 3 or the second electrode 4) are stacked in sequence, that is, the insulating layer 2 is located between the overlapping portion of the interconnection bar 1 and the electrodes of different polarities, so as to insulate the interconnection bar 1 from the electrodes of different polarities. In detail, the insulating layer 2 is arranged along the second direction (such as Figure 1 The length of the vertical direction shown) (i.e. Figure 1 l) is configured to be greater than the length of the bonding portion 5 (ie, the pad) (ie, as shown in FIG. Figure 1 Furthermore, both ends of the insulating layer 2 along the second direction (as shown in a) Figure 1 The size of the portion of the upper and lower ends (shown) protruding from the joint 5 is x, satisfying 0.8d-0.1mm<x<1.2d+0.1mm, where d represents the width of the interconnection strip 1 along the second direction.

[0046] When the interconnection strip 1 (i.e., solder pad) is connected to the joint 5 (i.e., solder pad), the preferred arrangement is that the interconnection strip 1 (i.e., solder strip) passes through the middle of the joint 5 (i.e., solder pad), that is, in the thickness direction facing the battery cell 6 (e.g., Figure 1 In the orthographic projection of the direction facing the paper shown in FIG, the substantially rectangular interconnection strip 1 (ie, the soldering strip) is made to extend along the second direction (eg Figure 1 The projection of the center line of the interconnection strip 1 (i.e., the vertical direction shown in FIG) coincides with the projection of the center line of the joint 5 (i.e., the pad). However, in the actual manufacturing process, when connecting the interconnection strip 1 (i.e., the soldering strip) and the joint 5 (i.e., the pad), it is inevitable that position offset will occur. This offset is mainly reflected in the second direction (i.e., as shown in FIG). Figure 1 the up and down directions).

[0047] According to a preferred embodiment of the present invention, Figure 1 As shown, the width of the interconnection strip 1 (ie, the solder strip) (ie, Figure 1 The illustrated d) includes, but is not limited to, being configured as 0.6 mm (i.e., d = 0.6 mm). Specifically, depending on the width of the interconnection strip 1 (i.e., the soldering ribbon), the dimension x of the portion of either end of the insulating layer 2 protruding from the joint 5 satisfies 0.38 mm < x < 0.82 mm. It should be understood that the embodiments of the present invention are not limited to this.

[0048] For example, the interconnection strip 1 may also be configured to have a width of 0.38 mm, 0.5 mm, 0.55 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.82 mm, or any other width suitable for welding with the joint 5 .

[0049] For another example, the interconnection strip 1 includes but is not limited to a flat welding strip, a round welding strip, a triangular welding strip or any other welding strip, wherein, for a welding strip having a non-rectangular cross-section along the width direction of the welding strip, the width of the interconnection strip 1 is characterized as the width along the second direction of the orthographic projection along the thickness direction of the battery cell 6.

[0050] In this embodiment, by configuring both ends of the insulating layer 2 along the second direction to protrude from the joint 5 and designing the dimensions of the portion protruding from the joint 5, it is advantageous to compensate for the deviation of the interconnection bar 1 relative to the joint 5 due to equipment precision, thereby more effectively preventing short circuits caused by the interconnection bar 1 being connected to first electrodes 3 or second electrodes 4 of different polarities. The different polarity refers to the polarity of the battery cell 6 to which the interconnection bar 1 should be connected. For example, if the interconnection bar 1 is connected to the positive electrode (first electrode 3) of the battery cell 6, the negative electrode (second electrode 4) is of a different polarity.

[0051] In a preferred embodiment, the length (i.e., a) of the joint portion 5 (i.e., the pad) includes, but is not limited to, being configured to be 0.6 mm to 2 mm, such as 1 mm. Furthermore, the width (i.e., d) of the interconnection bar 1 includes, but is not limited to, being configured to be greater than or equal to 0.6 mm, such as 0.6 mm. Furthermore, based on the aforementioned length of the joint portion 5 and the width of the interconnection bar 1, the length (i.e., l) of the insulating layer 2 includes, but is not limited to, being configured to be 1 mm to 3 mm, such as 2.2 mm. It should be understood that the embodiments of the present invention are not limited to this.

[0052] For example, the length of the insulating layer 2 can also be configured to be 2.25 mm, 2.3 mm, 2.4 mm, 2.45 mm, 2.5 mm, or any other length suitable for insulating the interconnection strip 1 from the second electrode 4 .

[0053] In such an embodiment, the size x of the portion of either end of the insulating layer 2 protruding from the joint (5) is configured to be approximately the same as the width of the interconnection strip 1, which can meet the requirement of the maximum offset position of the interconnection strip 1 (i.e., the soldering strip) relative to the joint 5. If the x is set too large, the insulating layer 2 will shield a large area of ​​the back side of the battery cell 6, reducing the amount of radiation absorbed by the back side, sacrificing the double-sidedness, and also resulting in waste of materials (such as insulating glue, including but not limited to green glue) for printing the insulating layer 2; if the x is set too small, there will be a risk of short circuit between the interconnection strip 1 (i.e., the soldering strip) and the second electrode 4.

[0054] Figure 2 yes Figure 1 The schematic diagram of the interconnection strip of the exemplary embodiment shown is in a first offset state.

[0055] refer to Figure 2As shown, the interconnection strip 1 (ie, the soldering strip) is shown relative to the joint portion 5 (ie, the soldering pad) along the second direction (eg, Figure 2 The left and right directions shown in FIG) are offset to the left by a first offset distance (i.e., as shown in FIG). Figure 2 In detail, the interconnection strip 1 (ie, the soldering strip) in the first offset position is in the thickness direction facing the battery cell 6 (eg, Figure 2 In the orthographic projection (in the direction facing the paper shown), it only partially overlaps with the joint part 5 (i.e., the pad), wherein the overlapping part of the interconnection strip 1 (i.e., the soldering strip) and the joint part 5 (i.e., the pad) is welded together by solder (such as solder).

[0056] Figure 3 yes Figure 1 The schematic diagram of the interconnection strip of the exemplary embodiment shown is in a second offset state.

[0057] refer to Figure 3 As shown, the interconnection strip 1 (ie, the soldering strip) is shown relative to the joint portion 5 (ie, the soldering pad) along the second direction (eg, Figure 3 The left and right directions shown in FIG) are offset to the left by a second offset distance (i.e., as shown in FIG). Figure 3 In detail, the interconnection strip 1 (ie, the soldering strip) in the second offset position is in the thickness direction facing the battery cell 6 (eg, Figure 3 In the orthographic projection (as shown facing the paper), the interconnection strip 1 (i.e., solder ribbon) is offset from the joint portion 5 (i.e., pad). That is, the interconnection strip 1 (i.e., solder ribbon) and the joint portion 5 (i.e., pad) are bonded only by the adhesive (e.g., mortar adhesive) on the side. However, the required connection force (including but not limited to 1.2N) between the interconnection strip 1 (i.e., solder ribbon) and the joint portion 5 (i.e., pad) is still maintained. This second offset state shows the maximum allowable offset position of the interconnection strip 5 (i.e., solder ribbon).

[0058] Similarly, the offset of the interconnection strip 1 (ie, solder strip) relative to the joint portion 5 (ie, solder pad) can also be as follows: Figure 2 or Figure 3 The right side offset shown is not described here.

[0059] According to an embodiment of the present invention, the size of the portion of either end of the insulating layer 2 protruding from the joint 5 satisfies d-0.1 mm≤x≤d+0.1 mm.

[0060] In a preferred embodiment, the size of the portion of either end of the insulating layer 2 protruding from the joint 5 can be configured to be substantially the same as the width (ie, d) of the interconnection bar 1 .

[0061] In such an embodiment, reference Figures 1 to 3 As shown, Figure 1 and Figure 3 The lower limit and upper limit of the offset position of the interconnection strip 1 relative to the welding portion 5 are shown respectively. Figure 2 The middle offset position between the upper and lower limits is shown. It can be seen from this that the maximum offset position of the interconnection bar 1 (i.e., the soldering strip) relative to the joint 5 (i.e., the pad) is the width of the interconnection bar 1. For this reason, x can be set to be roughly equal to d. However, based on actual processing errors, for this reason, the size of the portion of either end of the insulating layer 2 protruding from the joint 5 can be set with a corresponding tolerance value (i.e., ±0.1 mm) based on the width of the interconnection bar 1 (i.e., d) as a redundancy for accuracy. In this way, even if the interconnection bar 1 reaches the following relative to the soldering part 5, Figure 3 The maximum offset position shown still maintains insulation between the interconnection strip 1 and the electrodes of different polarity (i.e., the first electrode 3 or the second electrode 4). Furthermore, the insulating layer 2 configured as described above is also suitable for compensating for deviation caused by bending of the interconnection strip 1 (i.e., the solder ribbon) during printing and / or other processes (e.g., bending of a portion of the interconnection strip 1 along the second direction), as well as isolating residual solder residue (e.g., tin slag) near the joint 5. Consequently, short circuits caused by the interconnection strip 1 (i.e., the solder ribbon) connecting to the second electrodes 3 of different polarity can be effectively avoided. It should be understood that the embodiments of the present invention are not limited to this.

[0062] For example, the tolerance value set based on the width (ie, d) of the interconnection strip 1 may also be ±0.05 mm, ±0.15 mm, ±0.2 mm, or other tolerance values ​​adapted to actual processing accuracy.

[0063] According to an embodiment of the present invention, Figures 1 to 3 As shown, in an orthographic projection along the third direction, the projection of the first electrode 3 or the second electrode 4 at least partially overlaps with the projection of the joint 5. The third direction is orthogonal to both the first and second directions. The end of the first electrode (second electrode) may overlap with the joint 5, meaning that the first electrode (second electrode) is electrically connected via the joint 5. Alternatively, the first electrode (second electrode) may be continuous, with the joint 5 covering the first electrode (second electrode). Alternatively, a portion of the first electrode (second electrode) may serve as the joint 5.

[0064] In such an embodiment, the first electrode 3 and the bonding portion 5 (ie, the pad) can be printed separately on the battery cell 6 in response to a printing process. It should be understood that the embodiments of the present invention are not limited thereto.

[0065] For example, the first electrode 3 and the bonding portion 5 (ie, the pad) may be integrally printed on the battery cell 6 .

[0066] Figure 4 yes Figure 1 An enlarged partial view of portion A of the exemplary embodiment is shown.

[0067] According to the embodiment of the present utility model, Figure 4As shown, the width of the insulating layer 2 along the first direction is y, satisfying b+65μm≤y≤D-55μm, b represents the width of the second electrode 4 along the first direction, and D represents the distance between the bonding portions 5 on both sides of the insulating layer 2 along the first direction.

[0068] According to a preferred embodiment of the present invention, Figure 4 As shown, the width of the insulating layer 2 along the first direction is configured to satisfy 0.2 mm ≤ y ≤ 0.6 mm.

[0069] In a preferred embodiment, the width of the second electrode 4 (i.e., b) includes, but is not limited to, 20 to 50 microns, such as 30 microns. Furthermore, the spacing between adjacent joints 5 (i.e., D) includes, but is not limited to, 0.6 to 1.2 mm, such as 0.8 mm. The spacing between adjacent joints is the minimum distance between them. Furthermore, based on the values ​​of b and D, the width of the insulating layer 2 (i.e., y) includes, but is not limited to, 0.2 to 0.6 mm, such as 0.35 mm. It should be understood that the embodiments of the present invention are not limited to this.

[0070] For example, the width of the insulating layer 2 can also be configured to be 0.25 mm, 0.3 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, or any other width suitable for covering the second electrode 4 .

[0071] In such an embodiment, by designing the width of the insulating layer 2 as described above, it is possible to compensate for the fact that during the actual printing of the insulating layer 2, the insulating layer 2 is displaced relative to the second electrode 4 along the first direction (eg, Figure 4 The vertical direction shown in the figure) is limited by the precision of the printing equipment (such as the screen). Furthermore, based on the above-mentioned dimensional design, the width of the insulating layer 2 can also be adjusted to supplement the properties of the material (such as the insulating glue) used to print the insulating layer 2 (such as the tension of the liquid insulating glue) and the manufacturing process (such as separation from the screen), so that the above-mentioned width configuration of the insulating layer 2 can also supplement the width of the insulating layer 2 near the first direction (such as Figure 4 The thickness margin of the edge of the insulating layer 2 (as shown in the upper and lower directions) is provided to prevent the edge of the insulating layer 2 (as shown in the upper and lower directions) from being too thick. Figure 4 The thickness of the insulating layer at the upper and lower ends of the insulating layer 2 shown in the figure is too thin, resulting in the problem that the second electrode 4 cannot be effectively covered.

[0072] In an illustrative embodiment, Figure 4 As shown, the insulating layer 2 is arranged along a first direction (eg Figure 4 The width of the vertical direction shown in Figure 4 y) is configured to be larger than the width of the second electrode 4 (ie, as shown in FIG. Figure 4 b), and is smaller than the two sides of the insulating layer 2 (i.e. Figure 4 The spacing of the joint 5 on the upper and lower sides shown in FIG. Figure 4 D) width shown, that is, b<y<D.

[0073] In such an embodiment, based on the above-mentioned width design of the insulating layer 2, the insulating layer 2 can cover the second electrode 4 to maintain the insulation between the second electrode 4 and the interconnection bar 1; and it can also prevent the insulating layer 2 from being too wide from covering a partial area of ​​the joint 5 (i.e., the pad), resulting in insufficient contact area between the joint 5 and the interconnection bar 1 (such as solder printing defects caused by insufficient contact area, resulting in the tensile force between the joint 5 and the interconnection bar 1 not meeting the standard).

[0074] Figure 5 yes Figure 4 A partial cross-sectional view of section BB of the exemplary embodiment is shown.

[0075] According to the embodiment of the present utility model, Figure 5 As shown, the thickness z of the insulating layer 2 along the third direction satisfies z≥h+18 μm, where h represents the thickness of the second electrode 4 along the third direction, and the third direction is orthogonal to both the first direction and the second direction.

[0076] According to the embodiment of the present utility model, Figure 5 As shown, the thickness of the insulating layer 2 along the third direction is less than the sum of the thickness of the colloid disposed between the bonding portion 5 and the interconnection bar 1 and the thickness of the bonding portion 5 .

[0077] According to the embodiment of the present utility model, Figure 5 As shown, the thickness of the insulating layer 2 along the third direction satisfies 20 μm≤z≤60 μm.

[0078] In such an embodiment, the insulating layer 2 can effectively cover the second electrode 4. The thickness of the insulating layer 2 is configured to be greater than the thickness of the second electrode 4, which can more effectively prevent the insulating layer 2 from being pierced by the second electrode 4 (such as piercing caused by the lamination process), thereby maintaining the insulating effect of the insulating layer 2. In addition, the thickness of the insulating layer 2 is configured to be less than the sum of the thickness of the colloid (such as gray glue) between the joint 5 and the interconnection strip 1 and the thickness of the joint 5, which can prevent the insulating layer 2 from being too thick, thereby avoiding excessive pressure on the interconnection strip 1 (i.e., the soldering strip), and causing the interconnection strip 1 (i.e., the soldering strip) to be deformed along the third direction (such as the soldering direction). Figure 5 Uncontrolled warping occurs in the up and down directions shown.

[0079] Furthermore, based on the aforementioned thickness setting, the insulating layer 2 also reserves a safety distance to prevent the insulating layer 2 from being broken down by the breakdown voltage, as well as the depth of pinhole bubbles generated during the preparation process and the depth of the indentation formed by the interconnection bar 1 crimped onto the insulating layer 2. The reserved safety distance includes, but is not limited to, being configured to be 10 microns, the depth of the vacuum bubble includes, but is not limited to, being configured to be 5 microns, and the depth of the indentation formed by the interconnection bar 1 includes, but is not limited to, being configured to be 3 microns.

[0080] In a preferred embodiment, the thickness of the second electrode 4 (i.e., h) includes, but is not limited to, 3 to 15 microns, such as 8 microns. Furthermore, in response to the thickness of the second electrode 4 (i.e., z), the thickness of the insulating layer 2 includes, but is not limited to, 20 to 60 microns, such as 40 microns. It should be understood that the embodiments of the present invention are not limited to this.

[0081] For example, the thickness of the insulating layer 2 may be configured to be 25 micrometers, 30 micrometers, 35 micrometers, 45 micrometers, 50 micrometers, or any other thickness that is beneficial to preventing puncture and / or breakdown.

[0082] Based on inventive concepts similar to those of the aforementioned photovoltaic modules, the present invention further provides a photovoltaic system comprising multiple photovoltaic modules. This photovoltaic system and the photovoltaic modules included therein combine the aforementioned photovoltaic modules' ability to compensate for misalignment between interconnecting strips (i.e., soldering ribbons) and joints (i.e., soldering pads), thereby preventing short circuits between the interconnecting strips and electrodes of different polarity.

[0083] It should also be noted that directional terms such as "upper," "lower," "front," "back," "left," and "right" mentioned in the embodiments are merely references to the drawings and are not intended to limit the scope of protection of the present invention. Throughout the drawings, identical elements are represented by identical or similar reference numerals. Conventional structures or configurations will be omitted where they may cause confusion in understanding the present invention.

[0084] The above describes embodiments of the present invention. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although each embodiment has been described separately above, this does not mean that the measures in each embodiment cannot be used in combination to advantage. The scope of the present invention is defined by the appended claims and their equivalents. Without departing from the scope of the present invention, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A photovoltaic module, characterized in that: Comprising at least one battery string, the battery string comprising battery cells (6) and interconnection bars (1); The first surface of the battery cell (6) is provided with a first electrode (3) and a second electrode (4), the first electrode (3) and the second electrode (4) are arranged alternately and spaced in sequence along a first direction and extend along a second direction, the second direction intersecting with the first direction, and the first electrode (3) and the second electrode (4) are both provided with a bonding portion (5); The interconnection bar (1) extends along the first direction, connecting in series the joint portions (5) arranged on different electrodes of at least two of the battery cells (6); The first surface of the battery cell (6) is further provided with an insulating layer (2), the insulating layer (2) covering the first electrode (3) and the second electrode (4) along the first direction corresponding to the joint portion (5) of the opposite-sex electrodes, and both ends of the insulating layer (2) along the second direction protrude from the joint portion (5) in the second direction; The size of the portion of either end of the insulating layer (2) protruding from the joint portion (5) is x, satisfying 0.8d-0.1mm<x<1.2d+0.1mm, where d represents the width of the interconnection strip (1) along the second direction.

2. The photovoltaic module according to claim 1, characterized in that: The size of the portion of either end of the insulating layer (2) protruding from the joint (5) satisfies d-0.1mm≤x≤d+0.1mm.

3. The photovoltaic module according to claim 1, characterized in that: The size of the portion of either end of the insulating layer (2) protruding from the joint portion (5) satisfies 0.38 mm < x < 0.82 mm.

4. The photovoltaic module according to claim 1, characterized in that: The length of the insulating layer (2) along the second direction is 1-3 mm.

5. The photovoltaic module according to any one of claims 1 to 4, characterized in that: The width of the insulating layer (2) along the first direction is y, satisfying b+65μm≤y≤D-55μm, b represents the width of the second electrode (4) along the first direction, and D represents the spacing between the joints (5) located on both sides of the insulating layer (2) along the first direction.

6. The photovoltaic module according to claim 5, characterized in that: The width of the insulating layer (2) along the first direction is configured to satisfy 0.2 mm ≤ y ≤ 0.6 mm.

7. The photovoltaic module according to any one of claims 1 to 4, characterized in that: The thickness z of the insulating layer (2) along the third direction satisfies z≥h+18 μm, where h represents the thickness of the second electrode (4) along the third direction, and the third direction is orthogonal to both the first direction and the second direction.

8. The photovoltaic module according to claim 7, characterized in that: The thickness of the insulating layer (2) along the third direction satisfies 20 μm≤z≤60 μm.

9. The photovoltaic module according to claim 7, characterized in that: The thickness of the insulating layer (2) along the third direction is less than the sum of the thickness of the colloid provided between the joint portion (5) and the interconnection strip (1) and the thickness of the joint portion (5).

10. The photovoltaic module according to any one of claims 1 to 4, characterized in that: In an orthographic projection along a third direction, a projection of the first electrode (3) or the second electrode (4) at least partially overlaps with a projection of the joint portion (5); the third direction is orthogonal to both the first direction and the second direction.

11. A photovoltaic system, characterized in that: The photovoltaic system comprises a plurality of photovoltaic modules according to any one of claims 1 to 10.

Images