Photovoltaic module with confluence of battery pieces and preparation method of photovoltaic module

Abstract

The invention relates to the field of photovoltaic technology, in particular to a photovoltaic module with confluence of battery pieces and a preparation method of the photovoltaic module. The photovoltaic module comprises photovoltaic cell main strings and photovoltaic cell bus strings, and two adjacent photovoltaic cell main strings are connected in series through the photovoltaic cell bus strings. The leading-out parts of the interconnection main grid lines at the serial connection ends of two adjacent photovoltaic cell main strings are connected into a whole through auxiliary lines, auxiliary adhesive tapes or auxiliary adhesive films; and the serial connection end interconnection main grid lines are connected to the corresponding photovoltaic cell pieces of the photovoltaic cell bus strings. According to the preparation method of the photovoltaic module, in the layout step of the photovoltaic module, layout of a photovoltaic cell main string and a photovoltaic cell bus string is carried out, and in the lamination step of the photovoltaic module, series connection end interconnection main grid lines and corresponding photovoltaic cells are welded. The beneficial effects are that a bus bar is replaced by the photovoltaic cell bus string so that power loss on the bus bar is avoided; the scheme is more suitable for automatic production of the photovoltaic module, and the production efficiency is high.

Description

Technical Field

[0001] The invention relates to the field of photovoltaic technology, in particular to a photovoltaic component with battery slice convergence and a preparation method thereof. Background Art

[0002] Existing photovoltaic modules usually use bus bars to connect the battery strings at the head, middle and tail. The bus bar itself has a certain resistance, which causes a certain loss to the module power. In addition, the bus bar will occupy a part of the module area, which does not contribute to the module efficiency. At the same time, the bus bar cost is also relatively high. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a photovoltaic module with battery cell busbars and a preparation method thereof, so as to reduce the use of busbars.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a photovoltaic module with battery cell convergence, including a photovoltaic battery main string and a photovoltaic battery convergence string, two adjacent photovoltaic battery main strings are connected in series through the photovoltaic battery convergence string; with the extension direction of the photovoltaic battery main string as the longitudinal direction, the photovoltaic battery convergence string is connected into a string by two photovoltaic battery sheets through a horizontally extending convergence interconnection main grid line; the specific structure of the two adjacent photovoltaic battery main strings connected in series through the photovoltaic battery convergence string is: the series connection ends of the two adjacent photovoltaic battery main strings have a longitudinally extending series connection end interconnection main grid line led outward, and the series connection end interconnection main grid line is a low-temperature welding wire; the series connection end interconnection main grid line The lead-out parts of the series-connected main grid lines are connected as a whole through auxiliary lines that cross the series-connected main grid lines, or the lead-out parts of the series-connected main grid lines are connected as a whole through auxiliary adhesive strips that cross the series-connected main grid lines, or the lead-out parts of the series-connected main grid lines are connected as a whole through auxiliary adhesive films that cover the series-connected main grid lines; two adjacent photovoltaic cell main strings are arranged in parallel horizontally, and the photovoltaic cell bus string is arranged horizontally at the series ends of the two adjacent photovoltaic cell main strings, and the two photovoltaic cell sheets of the photovoltaic cell bus string each correspond to one photovoltaic cell main string, and the series-connected main grid lines of the photovoltaic cell main strings are connected to the corresponding photovoltaic cell sheets of the photovoltaic cell bus string.

[0005] It is further defined that the two photovoltaic cells in the photovoltaic cell bus string are photovoltaic cells with positive and negative poles on different sides, the positive and negative poles of the photovoltaic cells are battery grid lines, the battery grid line as the positive pole and the battery grid line as the negative pole are perpendicular to each other, and are used to respectively adapt and connect with the longitudinally extending series end interconnection main grid line and the transversely extending bus interconnection main grid line.

[0006] It is further defined that the number of the auxiliary wires is 1 to 5 and they are located on a side of the serial-end interconnection main grid wire away from the photovoltaic cell sheet, and the auxiliary wires are connected to the serial-end interconnection main grid wire by welding or bonding.

[0007] It is further defined that the serial end interconnecting main grid line of one of the two adjacent photovoltaic cell main strings is located on the front side of the corresponding photovoltaic cell piece of the photovoltaic cell bus string, and the serial end interconnecting main grid line of the other photovoltaic cell main string is located on the back side of the corresponding photovoltaic cell piece of the photovoltaic cell bus string.

[0008] It is further defined that there are 1 to 5 auxiliary rubber strips, which are bonded and connected to the serial-end interconnection main grid lines; the auxiliary rubber film is bonded and connected to the serial-end interconnection main grid lines; the auxiliary rubber strips and the auxiliary rubber film are located on the side of the serial-end interconnection main grid lines away from the busbar photovoltaic cell.

[0009] A method for preparing a photovoltaic module with the above-mentioned cell bus string comprises preparing a main photovoltaic cell string and a photovoltaic cell bus string respectively, and in the layout step of the photovoltaic module, the main photovoltaic cell string and the photovoltaic cell bus string are laid out, and in the lamination step of the photovoltaic module, under lamination process conditions, the serial-end interconnection main grid line is welded to the corresponding photovoltaic cell sheets of the photovoltaic cell bus string to complete the series connection between two adjacent photovoltaic cell main strings through the photovoltaic cell bus string.

[0010] It is further defined that when the serial-end interconnected main grid line of one of the two adjacent photovoltaic cell main strings is located above the corresponding photovoltaic cell piece of the photovoltaic cell bus string, and the serial-end interconnected main grid line of the other photovoltaic cell main string is located below the corresponding photovoltaic cell piece of the photovoltaic cell bus string, in the layout step of the photovoltaic component, the specific steps of layout of the photovoltaic cell main strings and the photovoltaic cell bus strings are: firstly, the photovoltaic cell main strings are swung, and then the photovoltaic cell bus strings and the serial-end interconnected main grid lines are stacked in place; the specific process of stacking the photovoltaic cell bus strings and the serial-end interconnected main grid lines in place is: firstly, the serial-end interconnected main grid lines and the photovoltaic cell pieces of the serial ends of the photovoltaic cell main strings are lifted, and then the photovoltaic cell pieces on one side of the photovoltaic cell bus string are stacked below the lifted serial-end interconnected main grid lines of the photovoltaic cell main string, and the photovoltaic cell pieces on the other side of the photovoltaic cell bus string are stacked above the serial-end interconnected main grid lines of the other adjacent photovoltaic cell main string that has not been lifted, and then the lifted photovoltaic cell main string is lowered.

[0011] In order to prevent the position of the aligned serial-end interconnected main grid lines from changing in subsequent steps, it is further defined that after the layout of the photovoltaic cell main string and the photovoltaic cell bus string is completed, the serial-end interconnected main grid lines and the photovoltaic cell sheets of the photovoltaic cell bus string are temporarily fixed, and then the subsequent layout steps of the photovoltaic module are carried out; when the serial-end interconnected main grid lines are below the photovoltaic cell sheets, the temporary fixing method is: the photovoltaic cell sheets and the adhesive film of the packaging structure below are ironed together by heating points; when the serial-end interconnected main grid lines are above the photovoltaic cell sheets and the serial-end interconnected main grid lines are connected as a whole by auxiliary lines, the temporary fixing method is: the auxiliary lines and the photovoltaic cell sheets are fixed by hot melt glue or UV glue; when the serial-end interconnected main grid lines are above the photovoltaic cell sheets and the serial-end interconnected main grid lines are connected as a whole by auxiliary adhesive strips and auxiliary adhesive films, the temporary fixing method is: the auxiliary adhesive strips and auxiliary adhesive films are fixed on the photovoltaic cell sheets by heating points.

[0012] The beneficial effects of the present invention are: replacing busbars with photovoltaic cell bus strings avoids power loss on the busbars and can increase component power;

[0013] The serial-end interconnection main grid lines are connected as a whole through auxiliary wires, auxiliary adhesive strips or auxiliary adhesive films. During the circulation of the photovoltaic cell main string, the spacing between the serial-end interconnection main grid lines can be kept fixed to ensure that the serial-end interconnection main grid lines are aligned with the battery main grid lines of the corresponding photovoltaic cells of the photovoltaic cell bus string, thereby ensuring the welding effect. The serial-end interconnection main grid lines are designed as low-temperature welding wires, which can achieve the layout step without the need to weld the serial-end interconnection main grid lines to the photovoltaic cell bus string, making it easier to achieve automation through equipment. Therefore, this solution is more suitable for the automated production of photovoltaic modules, has high production efficiency, and can be achieved by using existing equipment or by adaptively improving existing equipment;

[0014] Eliminating the busbar can reduce the size of the module, which can reduce the cost of the panel, packaging film material, frame, backplane, packaging, transportation and installation;

[0015] Replacing bus bars with photovoltaic cell bus strings can also improve the overall aesthetics of photovoltaic modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0017] Figure 1 is a schematic diagram of the front structure of the first photovoltaic cell of Example 1 of the present invention;

[0018] Figure 2 is a schematic diagram of the back structure of the first photovoltaic cell of Example 1 of the present invention;

[0019] Figure 3 is a schematic diagram of the front structure of the second photovoltaic cell of Example 1 of the present invention;

[0020] Figure 4 is a schematic diagram of the back structure of the second photovoltaic cell of Example 1 of the present invention;

[0021] Figure 5 is a schematic diagram of the front structure of a third photovoltaic cell according to Embodiment 1 of the present invention;

[0022] Figure 6 is a schematic diagram of the back structure of the third photovoltaic cell according to the first embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the front structure of the first photovoltaic cell main string of embodiment 1 of the present invention;

[0024] Figure 8 is a schematic diagram of the side structure of the first photovoltaic cell main string of embodiment 1 of the present invention;

[0025] Fig. 9 is a schematic diagram of the front structure of the second photovoltaic cell main string of embodiment 1 of the present invention;

[0026] Fig.10 is a schematic diagram of the side structure of the second photovoltaic cell main string of embodiment 1 of the present invention;

[0027] Fig.11 is a schematic diagram of the front structure of the first photovoltaic cell bus string of embodiment 1 of the present invention;

[0028] Fig.12 is a schematic side structural diagram of a first photovoltaic cell bus string according to Embodiment 1 of the present invention;

[0029] Fig.13 is a schematic diagram of the back structure of the first photovoltaic cell bus string of embodiment 1 of the present invention;

[0030] Fig.14 is a schematic diagram of the front structure of the second photovoltaic cell bus string of embodiment 1 of the present invention;

[0031] Fig.15 is a schematic side structural diagram of a second photovoltaic cell bus string according to Embodiment 1 of the present invention;

[0032] Fig.16 is a schematic diagram of the back structure of the second photovoltaic cell bus string of embodiment 1 of the present invention;

[0033] Fig.17 is a schematic structural diagram of a photovoltaic cell main string connected in series through a photovoltaic cell bus string according to Embodiment 1 of the present invention;

[0034] Fig.18 It is a schematic diagram of a half-cut or multi-cut photovoltaic module with an even number of strings in Example 1 of the present invention, with the front side facing downward;

[0035] Fig.19 The photovoltaic cell bus string facing downward of the present invention is Fig.18 The schematic diagram of the structure after the main grid lines of the serial connection ends of the two adjacent photovoltaic cell main strings 1 are stacked in place in the lower left corner;

[0036] Fig. 20 It is a schematic structural diagram of a photovoltaic module of a half-slice or multi-slice format with an even number of strings according to Example 1 of the present invention;

[0037] Fig.21 It is a schematic diagram of a half-cut or multi-cut photovoltaic module of an odd-numbered string in Example 1 of the present invention, with the front side facing downward;

[0038] Fig. 22 It is a schematic structural diagram of a photovoltaic module of a half-slice or multi-slice format with an odd number of strings according to Embodiment 1 of the present invention;

[0039] Fig.23 This is a schematic diagram of the front structure of the first photovoltaic cell main string of embodiment 2 of the present invention;

[0040] Fig.24 is a schematic structural diagram of a photovoltaic cell main string connected in series through a photovoltaic cell bus string according to Embodiment 2 of the present invention;

[0041] Fig.25 This is a schematic diagram of the front structure of the first photovoltaic cell main string of embodiment 3 of the present invention;

[0042] In the figure, 1. photovoltaic cell main string, 1-1. first type of photovoltaic cell main string, 1-2. second type of photovoltaic cell main string, 2. photovoltaic cell bus string, 2-1. first type of photovoltaic cell bus string, 2-2. second type of photovoltaic cell bus string, 3. photovoltaic cell sheet, 3-1. first type of photovoltaic cell sheet, 3-2. second type of photovoltaic cell sheet, 3-3. third type of photovoltaic cell sheet, 4. interconnection main grid line, 4-1. bus interconnection main grid line, 4-2. series end interconnection main grid line, 5. auxiliary line, 6. battery main grid line, 7. bus bar, 7-1. jumper, 8. auxiliary rubber strip, 9. auxiliary adhesive film. DETAILED DESCRIPTION

[0043] Example 1

[0044] like Figures 1 to 22As shown, a photovoltaic module with a cell busbar comprises a photovoltaic cell main string 1 and a photovoltaic cell busbar string 2, wherein two adjacent photovoltaic cell main strings 1 are connected in series via the photovoltaic cell busbar string 2; with the extension direction of the photovoltaic cell main string 1 as the longitudinal direction, the photovoltaic cell busbar string 2 is composed of two photovoltaic cells 3 connected into a string via a laterally extending busbar interconnection main grid 4-1.

[0045] like Fig.17 As shown, the specific structure of two adjacent photovoltaic cell main strings 1 being connected in series through a photovoltaic cell bus string 2 is as follows: the series ends of the two adjacent photovoltaic cell main strings 1 have a series end interconnection main grid line 4-2 extending longitudinally outward, and the series end interconnection main grid line 4-2 is a low-temperature welding wire; the lead-out portion of the series end interconnection main grid line 4-2 is connected as a whole through an auxiliary line 5 crossing the series end interconnection main grid line 4-2; the two adjacent photovoltaic cell main strings 1 are arranged in parallel horizontally, and the photovoltaic cell bus string 2 is arranged horizontally at the series ends of the two adjacent photovoltaic cell main strings 1, and the two photovoltaic cell sheets 3 of the photovoltaic cell bus string 2 each correspond to one photovoltaic cell main string 1, and the series end interconnection main grid line 4-2 of the photovoltaic cell main string 1 is connected to the corresponding photovoltaic cell sheet 3 of the photovoltaic cell bus string 2.

[0046] Specifically, the two photovoltaic cells 3 of the photovoltaic cell bus string 2 are photovoltaic cells 3 with positive and negative poles on different sides. The positive and negative poles of the photovoltaic cell 3 are battery grid lines. The battery grid line as the positive pole and the battery grid line as the negative pole are perpendicular to each other, and are used to adapt and connect with the longitudinally extending series end interconnection main grid line 4-2 and the transversely extending bus interconnection main grid line 4-1 respectively.

[0047] The photovoltaic cell 3 in the photovoltaic cell main string 1 is also a photovoltaic cell 3 with positive and negative poles on different sides. The positive and negative poles of the photovoltaic cell 3 are battery grid lines. The battery grid line as the positive pole and the battery grid line as the negative pole are arranged in the same direction and are used to be connected into a string through a longitudinally extending interconnected main grid line 4.

[0048] The photovoltaic cells 3 in the photovoltaic cell main string 1 and the photovoltaic cell bus string 2 of this embodiment 1 are multi-busbar photovoltaic cells. There are three types of photovoltaic cells 3 in the photovoltaic module. The front and back battery grid lines of the three types of photovoltaic cells 3 are composed of battery main grid lines 6 and battery fine grid lines that are perpendicular to each other. The battery fine grid lines are not shown in all the drawings. Figure 1 and 2 As shown, the main grid lines 6 of the front and back sides of the first photovoltaic cell sheet 3-1 are both longitudinal. Figure 3 and 4 As shown, the battery busbars 6 on the front side of the second photovoltaic cell 3-2 are longitudinal, and the battery busbars 6 on the back side are transverse. Figure 5 and 6As shown, the main grid lines 6 on the front side of the third photovoltaic cell sheet 3 - 3 are horizontal, and the main grid lines 6 on the back side are vertical.

[0049] There are two types of photovoltaic cell main strings 1 and two types of photovoltaic cell bus strings 2 in the photovoltaic module of the first embodiment.

[0050] The polarities of the serial connection ends of the two photovoltaic cell main strings 1 are opposite. Figure 7 and 8 As shown, the first photovoltaic cell main string 1-1 is formed by connecting n first photovoltaic cells 3-1 in series, with the connecting end being the tail of the photovoltaic cell main string 1, the interconnecting main grid line 4 at the head of the photovoltaic cell main string 1 is led out from the back of the photovoltaic cell 3 at the head, and the connecting end interconnecting main grid line 4-2 is led out from the front of the photovoltaic cell 3 at the tail, the connecting end interconnecting main grid line 4-2 has a lead-out length that matches the length of a photovoltaic cell 3, and is used to connect with the corresponding photovoltaic cell 3 of the photovoltaic cell bus string 2, the auxiliary wire 5 vertically crosses the lead-out part of the connecting end interconnecting main grid line 4-2, the number of the auxiliary wires 5 is 1 to 5, and is located on the side of the connecting end interconnecting main grid line 4-2 away from the photovoltaic cell 3, the auxiliary wire 5 is welded or bonded to the connecting end interconnecting main grid line 4-2, and the connecting end interconnecting main grid line 4-2 is a low-temperature welding wire. In the figure, the number of the auxiliary wire 5 is 1.

[0051] The auxiliary line 5 is arranged on the side of the serial-end interconnection main grid line 4-2 away from the photovoltaic cell 3 to avoid the auxiliary line 5 being sandwiched between the serial-end interconnection main grid line 4-2 and the photovoltaic cell 3 of the photovoltaic cell bus string 2, thereby affecting the welding reliability of the serial-end interconnection main grid line 4-2 and the photovoltaic cell 3.

[0052] like Fig. 9 and 10 As shown, the second photovoltaic cell main string 1-2 is also formed by connecting n pieces of the first photovoltaic cell 3-1 in series, with the series connection end being the tail of the photovoltaic cell main string 1, the interconnection busbar 4 at the head of the photovoltaic cell main string 1 is led out from the front of the photovoltaic cell 3 at the head, and the series connection end interconnection busbar 4-2 is led out from the back of the photovoltaic cell 3 at the tail, the lead-out length of the series connection end interconnection busbar 4-2 matches the length of a photovoltaic cell 3, and is used to connect with the corresponding photovoltaic cell 3 of the photovoltaic cell bus string 2, the auxiliary wire 5 vertically crosses the lead-out part of the series connection end interconnection busbar 4-2, the number of the auxiliary wires 5 is 1 to 5, and is located on the side away from the photovoltaic cell, the auxiliary wire 5 is welded or bonded to the series connection end interconnection busbar 4-2, and the series connection end interconnection busbar 4-2 is a low-temperature welding wire. In the figure, the number of the auxiliary wire 5 is 1.

[0053] like Fig.11 , 12As shown in FIG. 13 , the first photovoltaic cell bus string 2-1 is formed by connecting a second photovoltaic cell 3-2 and a third photovoltaic cell 3-3 in series, the second photovoltaic cell 3-2 is on the left, the third photovoltaic cell 3-3 is on the right, the back of the second photovoltaic cell 3-2 and the front of the third photovoltaic cell 3-3 are connected into a string through a laterally extending bus interconnection busbar 4-1, and there is no interconnection busbar 4 on the front of the second photovoltaic cell 3-2 and the back of the third photovoltaic cell 3-3.

[0054] like Fig.14 , 15 As shown in 16, the second photovoltaic cell bus string 2-2 is also formed by connecting a second photovoltaic cell 3-2 and a third photovoltaic cell 3-3 in series, the third photovoltaic cell 3-3 is on the left, the second photovoltaic cell 3-2 is on the right, the front of the third photovoltaic cell 3-3 and the back of the second photovoltaic cell 3-2 are connected into a string through a laterally extending bus interconnection busbar 4-1, and there is no interconnection busbar on the back of the third photovoltaic cell 3-3 and the front of the second photovoltaic cell 3-2.

[0055] The preparation method of the photovoltaic module with the above-mentioned cell bus in the present embodiment 1 is as follows: prepare the photovoltaic cell main string 1 and the photovoltaic cell bus string 2 respectively, in the layout step of the photovoltaic module, layout the photovoltaic cell main string 1 and the photovoltaic cell bus string 2, in the lamination step of the photovoltaic module, under the lamination process conditions, the series-connected end interconnecting main grid line 4-2 is welded to the corresponding photovoltaic cell 3 of the photovoltaic cell bus string 2, and the series connection between the two adjacent photovoltaic cell main strings 1 is completed through the photovoltaic cell bus string 2.

[0056] In the layout step of the photovoltaic module, the specific method for layout of the photovoltaic cell main string 1 and the photovoltaic cell bus string 2 is: firstly, the photovoltaic cell main string 1 is swung, and then the photovoltaic cell bus string 2 and the serial end interconnection main grid line 4-2 are stacked in place.

[0057] The specific process of stacking the photovoltaic cell bus string 2 and the serial terminal interconnection main grid line 4-2 is as follows:

[0058] First, lift up the serial-end interconnecting busbar 4-2 and the photovoltaic cell 3 of the serial-end of the photovoltaic cell main string 1, and then stack the photovoltaic cell 3 on one side of the photovoltaic cell bus string 2 below the lifted serial-end interconnecting busbar 4-2 of the photovoltaic cell main string 1, and stack the photovoltaic cell 3 on the other side of the photovoltaic cell bus string 2 above the serial-end interconnecting busbar 4-2 of another adjacent photovoltaic cell main string 1 that has not been lifted, and then put down the lifted photovoltaic cell main string 1.

[0059] In this article, the front side of the photovoltaic cell 3 refers to the side of the photovoltaic cell 3 facing the sun during actual outdoor power generation applications; the back side of the photovoltaic cell 3 refers to the side of the photovoltaic cell 3 facing away from the sun during actual outdoor power generation applications; the top and bottom of the photovoltaic cell 3 refer to the top and bottom of the spatial position of the photovoltaic cell 3.

[0060] The arrangement of the photovoltaic cell main string 1 in the photovoltaic module can be a full series layout, or a half-slice or multi-slice layout. Based on the layout design, manufacturing cost and module efficiency, it is generally preferred that the bus bar 7 is only on the side where the junction box is required, and the side without the junction box adopts the above-mentioned cell bus scheme to achieve no bus bar 7. The full series layout is that the junction box is on the head side of the photovoltaic module, and there is no bus bar 7 at the tail of the photovoltaic cell main string 1. The head of the photovoltaic cell main string 1 is connected through the bus bar 7 and connected to the junction box through the bus bar 7.

[0061] Fig. 20 The photovoltaic cell main string 1 of the photovoltaic module shown is arranged in a half-slice or multi-slice format, the junction box is located in the middle of the photovoltaic module, there is no bus bar 7 at the tail of the photovoltaic cell main string 1, and the photovoltaic cell bus string 2 is used to realize the series connection of the photovoltaic cell main string 1. Fig. 20 The middle junction box is not shown.

[0062] To prepare Fig. 20 Taking the photovoltaic module as an example, the specific steps of the above preparation method are further described as follows:

[0063] 1) Preparation of photovoltaic cell main string 1 and photovoltaic cell bus string 2:

[0064] The photovoltaic cell main string 1 and the photovoltaic cell bus string 2 are welded, and the auxiliary wire 5 is welded while the photovoltaic cell pieces 3 are welded into the photovoltaic cell main string 1 through the interconnected main grid lines, and the auxiliary wire 5 is welded together with the serial connection end interconnected main grid line 4-2. The auxiliary wire 5 is used to keep the spacing position between the serial connection end interconnected main grid lines 4-2 fixed during the circulation of the photovoltaic cell main string 1, so as to ensure that the serial connection end interconnected main grid line 4-2 is aligned with the battery main grid line 6 of the corresponding photovoltaic cell piece 3 of the photovoltaic cell bus string 2, and ensure the welding effect;

[0065] 2) Layout of photovoltaic modules:

[0066] The photovoltaic module includes packaging layers and photovoltaic cell layers. The photovoltaic cell layer includes a photovoltaic cell main string 1, a photovoltaic cell bus string 2, and a bus bar 7 connecting the photovoltaic cell main string 1 to a junction box. The packaging layers and photovoltaic cell layers are arranged in sequence.

[0067] Because the side in contact with the bottom plate of the laminator during lamination should be as flat as possible, and the junction box of the photovoltaic module is generally installed on the back of the photovoltaic module, and the bus bar 7 will be led out on the back of the photovoltaic module, which is not as flat as the front of the photovoltaic module. Therefore, during the lamination process, the photovoltaic module is always placed face down in the laminator for lamination. Therefore, during the layout process of the photovoltaic module, the front side is generally used for layout, that is, when the structure of the photovoltaic module is panel layer, front side packaging film layer, photovoltaic cell layer, back side packaging film layer, and back plate layer from top to bottom, the photovoltaic module is laid out in the order of panel layer, front side packaging film layer, photovoltaic cell layer, back side packaging film layer, and back plate layer, and each layer is face down. The packaging structure below the photovoltaic cell layer is the panel layer and the front side packaging film layer.

[0068] The layout steps of the photovoltaic cell layer are as follows:

[0069] 2.1) Placing the photovoltaic cell main string 1: Place the photovoltaic cell main string 1 facing downward on the lower packaging structure according to the designed position, with the side with auxiliary line 5 at the head and tail of the component, and the side without auxiliary line 5 at the middle position. Fig.18 As shown;

[0070] 2.2) Stitch welding:

[0071] Step 1: lift the arranged photovoltaic cell main string 1 to further calibrate the string spacing;

[0072] Step 2: Complete the lap welding of the bus bar 7 at the middle position of the photovoltaic module;

[0073] Step 3: stack the photovoltaic cell bus string 2 and the serial terminal interconnection main grid line 4-2. Fig.18 Taking the two adjacent photovoltaic cell main strings 1 in the lower left corner as an example, lift the tail 1-3 photovoltaic cell sheets 3 and the serial-end interconnection busbar 4-2 of the first photovoltaic cell main string 1 (i.e., the first photovoltaic cell main string 1-1) in the lower left corner, and stack the photovoltaic cell sheets 3 on the left side of the photovoltaic cell bus string 2 facing downward to below the serial-end interconnection busbar 4-2 of the first photovoltaic cell main string 1 (i.e., the first photovoltaic cell main string 1-1), and stack the photovoltaic cell sheets 3 on the right side of the photovoltaic cell bus string 2 to above the serial-end interconnection busbar 4-2 of the adjacent second photovoltaic cell main string 1 (i.e., the second photovoltaic cell main string 1-2) that is not lifted, and align the serial-end interconnection busbar 4-2 with the battery busbar 6 on the surface of the corresponding photovoltaic cell sheet 3 of the photovoltaic cell bus string 2;

[0074] Step 4: Fig.18Taking the two adjacent photovoltaic cell main strings 1 in the lower left corner as an example, the lifted first photovoltaic cell main string 1 is put down. During the putting down process, the battery main grid line 6 on the surface of the photovoltaic cell 3 corresponding to the serial end interconnection main grid line 4-2 and the photovoltaic cell bus string 2 is kept aligned. The photovoltaic cell bus string 2 is stacked with the serial end interconnection main grid line 4-2 in place, as shown in FIG. Fig.19 As shown;

[0075] Step 5: Fig.18 Taking the two adjacent photovoltaic cell main strings 1 in the lower left corner as an example, the auxiliary line 5 of the first photovoltaic cell main string 1 and the photovoltaic cell sheet 3 on the left side of the photovoltaic cell bus string 2 are fixed by hot melt glue or UV glue, and the photovoltaic cell sheet 3 on the right side of the photovoltaic cell bus string 2 and the adhesive film of the packaging structure below are ironed together by heating points. This fifth step can be removed or added depending on the stability of the production line. Other adjacent photovoltaic cell main strings 1 are also connected in series through the photovoltaic cell bus string 2 according to the above steps. The series connection of adjacent photovoltaic cell main strings 1 in the photovoltaic module can be carried out simultaneously;

[0076] 3) Lamination steps of photovoltaic modules:

[0077] During lamination, the lamination temperature is ensured to be higher than the melting temperature of the low-temperature welding layer of the serial-end interconnected main grid line 4-2, and the serial-end interconnected main grid line 4-2 is welded to the corresponding photovoltaic cell piece 3 of the photovoltaic cell bus string 2 to complete the series connection between the two adjacent photovoltaic cell main strings 1 through the photovoltaic cell bus string 2.

[0078] The other preparation steps of the above-mentioned photovoltaic module with integrated cells in this embodiment 1 are basically the same as the preparation steps of conventional modules.

[0079] The welding of the photovoltaic cell main string 1 and the photovoltaic cell bus string 2 in step 1 can be automatically welded by an existing welding machine; the swing string in step 2.1 can be automatically swing string by an existing swing string machine; the stitch welding in step 2.2 can be automatically stitch welded by an existing stitch welding machine. Of course, in order to better lift the serial end interconnection main grid line 4-2, it is only necessary to change the size of the vacuum suction nozzle for adsorbing the battery cell of the existing swing string machine and stitch welding machine to make it more suitable for adsorbing the auxiliary line 5, or replace the vacuum suction nozzle with a clamp to clamp the auxiliary line 5 by the clamp.

[0080] The power and color of the photovoltaic cell sheets 3 of the photovoltaic cell main string 1 and the photovoltaic cell bus string 2 are of the same or similar level.

[0081] The serial-connected interconnecting main grid wire 4 - 2 is a low-temperature welding wire, and the remaining interconnecting main grid wires can be either low-temperature welding wires or normal welding wires.

[0082] The photovoltaic cell main string 1 in the photovoltaic module can be an even number string or an odd number string, such as Fig. 20The photovoltaic cell main string 1 in the photovoltaic module shown is an even number string, and the tail of the photovoltaic cell main string 1 is connected in series through the photovoltaic cell bus string 2. When the photovoltaic cell main string 1 is an odd number string, one of the photovoltaic cell main strings 1 can be connected through the interconnecting main grid line extending laterally of the second photovoltaic cell sheet 3-2 or the third photovoltaic cell sheet 3-3 and the bus bar 7 as the jumper 7-1, and connected to the junction box, such as Fig.21 and 22 As shown, Fig.21 yes Fig. 22 Schematic diagram of a photovoltaic panel with its front side facing downward. Fig. 22 The junction box is also not shown.

[0083] The photovoltaic cells 3 in the photovoltaic cell main string 1 and the photovoltaic cell bus string 2 of the present embodiment 1 may also be busbar-less photovoltaic cells.

[0084] When the photovoltaic cells 3 in the photovoltaic cell main string 1 and the photovoltaic cell bus string 2 are main-gridless photovoltaic cells, there are a total of three types of photovoltaic cells 3 in the photovoltaic module of this embodiment 1. The battery grid lines on the front and back of the three types of photovoltaic cells 3 are all composed of fine battery grid lines. The fine battery grid lines on the front and back of the first type of photovoltaic cell 3-1 are both horizontal, the fine battery grid lines on the front of the second type of photovoltaic cell 3-2 are horizontal, and the fine battery grid lines on the back are vertical, and the fine battery grid lines on the front of the third type of photovoltaic cell 3-3 are vertical, and the fine battery grid lines on the back are horizontal.

[0085] Embodiment 2, as Fig.23 and 24 As shown, the present embodiment 2 is basically the same as the embodiment 1, except that: the serial-end interconnection busbars 4-2 are connected as a whole by the auxiliary rubber strips 8 that cross the serial-end interconnection busbars 4-2. The auxiliary rubber strips 8 can be EVA, EPE, PVB or POE, etc., and can be 1 to 10 mm in size, with 1 to 5 strips. Because the auxiliary rubber strips 8 are made of transparent material, compared with the embodiment 1, the auxiliary wires 5 are not visible on the final finished photovoltaic module of the present embodiment 2, which is more beautiful.

[0086] The method for temporarily fixing the serial-end interconnection main grid line 4 - 2 and the photovoltaic cell sheet 3 of the photovoltaic cell bus string 2 below is: fixing the auxiliary adhesive strip 8 on the photovoltaic cell sheet 3 by heating.

[0087] Embodiment 3, as Fig.25 As shown, the present embodiment 3 is basically the same as the embodiment 2, except that the auxiliary adhesive strip 8 is enlarged into a whole auxiliary adhesive film 9, and the size of the auxiliary adhesive film 9 is similar to that of the photovoltaic cell 3.

[0088] The method for temporarily fixing the serial-end interconnection main grid line 4 - 2 and the photovoltaic cell sheet 3 of the photovoltaic cell bus string 2 below is: fixing the auxiliary adhesive film 9 on the photovoltaic cell sheet 3 by heating.

Claims

1. A photovoltaic module with battery cell confluence, characterized by: It comprises a photovoltaic cell main string (1) and a photovoltaic cell bus string (2), wherein two adjacent photovoltaic cell main strings (1) are connected in series via the photovoltaic cell bus string (2); With the extension direction of the photovoltaic cell main string (1) as the longitudinal direction, the photovoltaic cell busbar string (2) is composed of two photovoltaic cell sheets (3) connected into a string via a busbar interconnection main grid line (4-1) extending in the transverse direction; The specific structure of two adjacent photovoltaic cell main strings (1) being connected in series via a photovoltaic cell bus string (2) is as follows: The serial connection ends of two adjacent photovoltaic cell main strings (1) are provided with a serial connection end interconnecting main grid wire (4-2) extending longitudinally outward, and the serial connection end interconnecting main grid wire (4-2) is a low-temperature welding wire; The lead-out portion of the serial-end interconnection main grid line (4-2) is connected as a whole through an auxiliary line (5) that crosses the serial-end interconnection main grid line (4-2), or the lead-out portion of the serial-end interconnection main grid line (4-2) is connected as a whole through an auxiliary adhesive strip (8) that crosses the serial-end interconnection main grid line (4-2), or the lead-out portion of the serial-end interconnection main grid line (4-2) is connected as a whole through an auxiliary adhesive film (9) that covers the serial-end interconnection main grid line (4-2); Two adjacent photovoltaic cell main strings (1) are arranged in parallel in a transverse direction, a photovoltaic cell bus string (2) is arranged transversely at the series connection ends of the two adjacent photovoltaic cell main strings (1), and two photovoltaic cell sheets (3) of the photovoltaic cell bus string (2) each correspond to one photovoltaic cell main string (1), and a main grid line (4-2) interconnecting the series connection ends of the photovoltaic cell main strings (1) is connected to the corresponding photovoltaic cell sheets (3) of the photovoltaic cell bus string (2).

2. The photovoltaic module with battery cells converging according to claim 1, characterized in that: The two photovoltaic cells (3) of the photovoltaic cell bus string (2) are photovoltaic cells (3) with positive and negative electrodes on different sides. The positive and negative electrodes of the photovoltaic cell (3) are battery grid lines. The battery grid lines as the positive electrodes and the battery grid lines as the negative electrodes are perpendicular to each other and are used to respectively adapt and connect with the longitudinally extending series end interconnection main grid lines (4-2) and the transversely extending bus interconnection main grid lines (4-1).

3. The photovoltaic module with battery-cell convergence according to claim 1, characterized in that: The number of the auxiliary wires (5) is 1 to 5 and they are located on the side of the serial-end interconnection main grid wire (4-2) away from the photovoltaic cell sheet (3). The auxiliary wires (5) are connected to the serial-end interconnection main grid wire (4-2) by welding or bonding.

4. The photovoltaic module with battery cells converging according to claim 2, characterized in that: The serial-end interconnecting main grid line (4-2) of one of the two adjacent photovoltaic cell main strings (1) is located on the front side of the corresponding photovoltaic cell sheet (3) of the photovoltaic cell bus string (2), and the serial-end interconnecting main grid line (4-2) of the other photovoltaic cell main string (1) is located on the back side of the corresponding photovoltaic cell sheet (3) of the photovoltaic cell bus string (2).

5. The photovoltaic module with battery cells converging according to claim 1, characterized in that: The number of the auxiliary rubber strips (8) is 1 to 5, and the auxiliary rubber strips (8) are bonded and connected to the serial-end interconnection main grid line (4-2); The auxiliary adhesive film (9) is bonded and connected to the serial terminal interconnection main grid line (4-2); The auxiliary adhesive strip (8) and the auxiliary adhesive film (9) are located on a side of the serial-end interconnection main grid line (4-2) away from the busbar photovoltaic cell sheet.

6. A method for preparing a photovoltaic module with battery cells converging as claimed in any one of claims 1 to 5, characterized in that: A photovoltaic cell main string (1) and a photovoltaic cell bus string (2) are prepared respectively. In the photovoltaic module layout step, the photovoltaic cell main string (1) and the photovoltaic cell bus string (2) are laid out. In the photovoltaic module lamination step, under lamination process conditions, the serial end interconnection main grid line (4-2) and the corresponding photovoltaic cell sheet (3) of the photovoltaic cell bus string (2) are welded to complete the series connection between two adjacent photovoltaic cell main strings (1) through the photovoltaic cell bus string (2).

7. The method for preparing a photovoltaic module with battery cell convergence according to claim 6, characterized in that: When the serial-end interconnecting main grid line (4-2) of one of two adjacent photovoltaic cell main strings (1) is located above the corresponding photovoltaic cell sheet (3) of the photovoltaic cell bus string (2), and the serial-end interconnecting main grid line (4-2) of the other photovoltaic cell main string (1) is located below the corresponding photovoltaic cell sheet (3) of the photovoltaic cell bus string (2), in the layout step of the photovoltaic module, the specific steps of layout of the photovoltaic cell main string (1) and the photovoltaic cell bus string (2) are as follows: First, the photovoltaic cell main string (1) is swung, and then the photovoltaic cell bus string (2) and the serial end interconnection main grid line (4-2) are stacked in place; The specific process of stacking the photovoltaic cell bus string (2) and the serial-end interconnecting main grid line (4-2) in place is as follows: first, the serial-end interconnecting main grid line (4-2) and the photovoltaic cell sheet (3) of the serial end of the photovoltaic cell main string (1) are lifted, and then the photovoltaic cell sheet (3) on one side of the photovoltaic cell bus string (2) is stacked below the lifted serial-end interconnecting main grid line (4-2) of the photovoltaic cell main string (1), and the photovoltaic cell sheet (3) on the other side of the photovoltaic cell bus string (2) is stacked above the serial-end interconnecting main grid line (4-2) of another adjacent photovoltaic cell main string (1) that has not been lifted, and then the lifted photovoltaic cell main string (1) is lowered.

8. The method for preparing a photovoltaic module with battery cell convergence according to claim 6, characterized in that: After the photovoltaic cell main string (1) and the photovoltaic cell bus string (2) are laid out, the serial end interconnecting main grid line (4-2) and the photovoltaic cell sheet (3) of the photovoltaic cell bus string (2) are temporarily fixed, and then the subsequent photovoltaic module layout steps are carried out; When the serial-end interconnection main grid line (4-2) is below the photovoltaic cell sheet (3), the temporary fixing method is: the photovoltaic cell sheet (3) and the adhesive film of the packaging structure below are ironed together through a heating point; When the serial-end interconnection main grid line (4-2) is above the photovoltaic cell sheet (3) and the serial-end interconnection main grid line (4-2) is connected as a whole through the auxiliary line (5), the temporary fixing method is: fixing the auxiliary line (5) and the photovoltaic cell sheet (3) through hot melt glue or UV glue; When the serial-end interconnected main grid lines (4-2) are above the photovoltaic cell sheet (3) and the serial-end interconnected main grid lines (4-2) are connected as a whole through the auxiliary adhesive strips (8) and the auxiliary adhesive film (9), the temporary fixing method is: the auxiliary adhesive strips (8) and the auxiliary adhesive film (9) are fixed on the photovoltaic cell sheet (3) by heating.

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