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 strings and confluence welding rods, and the confluence welding rods are used for connecting two adjacent photovoltaic cell strings. The two sides of the confluence welding rod are respectively welded with confluence photovoltaic cells of two adjacent photovoltaic cell strings, the confluence welding rod comprises a plurality of welding strips, the welding strips on the two sides of the confluence welding rod are connected into a whole through auxiliary lines, auxiliary adhesive tapes or auxiliary adhesive films, and the welding strips of the confluence welding rod are low-temperature welding strips. According to the preparation method of the photovoltaic module, in the composing step of the photovoltaic module, composing of a photovoltaic cell string and a confluence welding rod is carried out, and in the laminating step of the photovoltaic module, welding of the confluence welding rod and a confluence photovoltaic cell piece is achieved. The beneficial effects are that the bus bar is replaced by the bus-bar photovoltaic cells and the bus-bar welding rods, 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 string and a busbar welding rod, the busbar welding rod is used to connect two adjacent photovoltaic battery strings; with the extension direction of the photovoltaic battery string as the longitudinal direction, the two adjacent photovoltaic battery strings connected by the busbar welding rod are arranged in parallel transversely, and the two sides of the busbar welding rod are respectively welded to the last photovoltaic battery cell at the same end of the two adjacent photovoltaic battery strings, and the last photovoltaic battery cell is called a busbar photovoltaic battery cell, the busbar welding rod includes a plurality of welding strips extending transversely and arranged in parallel with each other, the busbar welding rod is welded to the busbar photovoltaic battery cell through the welding strips, and the welding strips on both sides of the busbar welding rod are connected as a whole by auxiliary lines or auxiliary adhesive strips crossing over the welding strips, or the welding strips on both sides of the busbar welding rod are connected as a whole by auxiliary adhesive films covering the welding strips, and the welding strips of the busbar welding rod are low-temperature welding welding strips.

[0005] It is further defined that each photovoltaic cell of the photovoltaic cell string is connected into a string through a longitudinally extending welding strip, and the welding directions of the battery grid lines on the front and back sides of the busbar photovoltaic cell are perpendicular to each other, which are used to respectively adapt to the welding of the longitudinally extending welding strip of the photovoltaic cell string and the welding of the transversely extending welding strip of the busbar welding rod.

[0006] It is further defined that the number of auxiliary wires on each side of the busbar is 1 to 5, and the auxiliary wires are welded or bonded to the welding strips of the busbar; the number of auxiliary rubber strips on each side of the busbar is 1 to 5, and the auxiliary rubber strips are bonded to the welding strips of the busbar; the auxiliary adhesive film is bonded to the welding strip of the busbar; the auxiliary wires, auxiliary rubber strips and auxiliary adhesive film are located on the side of the welding strip of the busbar facing away from the busbar photovoltaic cell.

[0007] It is further defined that two adjacent photovoltaic cell strings are connected in series through a busbar, one side of the busbar is located on the front side of a busbar photovoltaic cell sheet, and the other side of the busbar is located on the back side of another adjacent busbar photovoltaic cell sheet.

[0008] A method for preparing a photovoltaic module with the above-mentioned cell convergence comprises preparing a photovoltaic cell string and a busbar welding rod respectively, and in the layout step of the photovoltaic module, the photovoltaic cell string and the busbar welding rod are laid out, and in the lamination step of the photovoltaic module, under the lamination process conditions, the busbar welding rod is welded to the converged photovoltaic cell sheets to complete the connection between two adjacent photovoltaic cell strings through the busbar welding rod.

[0009] It is further defined that when one side of the busbar welding rod is located on the front side of a busbar photovoltaic cell and the other side of the busbar welding rod is located on the back side of another adjacent busbar photovoltaic cell, in the layout step of the photovoltaic module, the specific steps for layout of the photovoltaic cell string and the busbar welding rod are: first, the photovoltaic cell string is swung, and then the busbar welding rod and the busbar photovoltaic cell are stacked in place, and the specific process of stacking the busbar welding rod and the busbar photovoltaic cell are stacked in place: first, the last one or several photovoltaic cells at the end of the photovoltaic cell string are lifted, and then one side of the busbar welding rod is stacked under the lifted busbar photovoltaic cell of the photovoltaic cell string, and the other side of the busbar welding rod is stacked above another adjacent busbar photovoltaic cell that has not been lifted, and then the lifted photovoltaic cell is lowered.

[0010] In order to prevent the positions of the busbar welding rods and busbar welding photovoltaic cells that have been arranged in place from changing in the subsequent photovoltaic module arrangement steps, after the photovoltaic cell string and the busbar welding rod arrangement are completed, the busbar welding rods and the busbar welding photovoltaic cells are temporarily fixed, and then the subsequent photovoltaic module arrangement steps are carried out; when the busbar welding rod is below the busbar welding photovoltaic cells, the temporary fixing method is: the busbar welding cell and the adhesive film of the front packaging structure below are ironed together through a heating point; when the busbar welding rod is above the busbar welding photovoltaic cells and the busbar welding rod is connected as a whole through an auxiliary line, the temporary fixing method is: the auxiliary line and the busbar welding photovoltaic cells are fixed by hot melt glue or UV glue; when the busbar welding rod is above the busbar welding photovoltaic cells and the busbar welding rod is connected as a whole through an auxiliary adhesive strip or an auxiliary adhesive film, the temporary fixing method is: the auxiliary adhesive strip or auxiliary adhesive film is fixed on the busbar welding photovoltaic cells by heating points.

[0011] The beneficial effects of the present invention are: by replacing the busbar with a busbar with a busbar photovoltaic cell sheet and a busbar welding rod, power loss on the busbar is avoided, and the power of the component can be increased;

[0012] The busbar welding rod is connected as a whole by auxiliary wires, auxiliary adhesive strips or auxiliary adhesive films, and the positions of the various welding strips of the busbar welding rod can be kept fixed during the circulation of the busbar welding rod. At the same time, the welding strip of the busbar welding rod is designed as a low-temperature welding strip, which can achieve the layout step of the photovoltaic module without welding the busbar welding rod and the busbar photovoltaic cell, and it is easier to realize automation through equipment. Therefore, this solution is more suitable for the automated production of photovoltaic modules, has high production efficiency, and can be realized by using existing equipment or making adaptive improvements to existing equipment;

[0013] 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;

[0014] By combining photovoltaic cells and combining welding rods instead of bus bars, the overall aesthetics of photovoltaic modules can also be improved;

[0015] First, connect the busbar photovoltaic cells with other photovoltaic cells into a string, and then arrange and weld them with busbar welding rods. The transportation is easier to achieve and the probability of problems is lower. At the same time, the preparation process is easier and the equipment is simpler to implement. In addition, the photovoltaic cells are loaded at the welding machine of the photovoltaic cell string, which makes it easier to control production. 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 is a front structural schematic diagram of a busbar welding rod according to Embodiment 1 of the present invention;

[0024] Figure 8 is a schematic side structural diagram of a busbar welding rod according to Embodiment 1 of the present invention;

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

[0026] Fig.10 is a schematic diagram of the side structure of a first photovoltaic cell string according to Embodiment 1 of the present invention;

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

[0028] Fig.12 is a schematic diagram of the front structure of the second photovoltaic cell string of embodiment 1 of the present invention;

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

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

[0031] Fig.15 It is a schematic diagram of a swinging string 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;

[0032] Fig.16 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;

[0033] Fig.17 is a schematic diagram of a process of stacking a busbar welding rod and a busbar photovoltaic cell sheet according to Embodiment 1 of the present invention;

[0034] Fig.18 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;

[0035] Fig.19 is a schematic diagram of the front structure of a busbar welding rod according to Embodiment 2 of the present invention;

[0036] Fig. 20 is a schematic side structural diagram of a busbar welding rod according to Embodiment 2 of the present invention;

[0037] Fig.21 is a front structural schematic diagram of a busbar welding rod according to Embodiment 3 of the present invention;

[0038] In the figure, 1. photovoltaic cell string, 1-1. first type of photovoltaic cell string, 1-2. second type of photovoltaic cell string, 2. busbar, 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. welding ribbon, 5. auxiliary wire, 6. auxiliary adhesive strip, 7. auxiliary adhesive film, 8. battery main grid line, 9. busbar. DETAILED DESCRIPTION

[0039] Example 1

[0040] like Figures 1 to 18 As shown, a photovoltaic module with a cell busbar comprises a photovoltaic cell string 1 and a busbar welding rod 2, wherein the busbar welding rod 2 is used to connect two adjacent photovoltaic cell strings 1; with the extension direction of the photovoltaic cell string 1 as the longitudinal direction, the two adjacent photovoltaic cell strings 1 connected by the busbar welding rod 2 are arranged in parallel transversely, and the two sides of the busbar welding rod 2 are respectively welded to the last photovoltaic cell 3 at the same end of the two adjacent photovoltaic cell strings 1, and the last photovoltaic cell 3 is called a busbar photovoltaic cell, and the busbar welding rod 2 comprises a plurality of welding strips 4 extending transversely and arranged in parallel with each other, and the busbar welding rod 2 is welded to the busbar photovoltaic cell through the welding strips 4, and the welding strips 4 on both sides of the busbar welding rod 2 are connected as a whole through auxiliary lines 5 crossing over the welding strips 4, and the welding strips 4 of the busbar welding rod 2 are low-temperature welding welding strips.

[0041] The number of auxiliary wires 5 on each side of the busbar 2 can be 1 to 5, and the auxiliary wires 5 are connected to the welding strips 4 of the busbar 2 by welding or bonding. In order to avoid the auxiliary wires 5 being sandwiched between the welding strips 4 of the busbar 2 and the busbar photovoltaic cell sheet, which affects the welding reliability of the welding strips 4 of the busbar 2 and the busbar photovoltaic cell sheet, the auxiliary wires 5 are located on the side of the welding strips 4 of the busbar 2 that is away from the busbar photovoltaic cell sheet, and the length of the welding strips 4 of the busbar 2 is about twice the horizontal length of the photovoltaic cell sheet 3. The auxiliary wires 5 can be made of metal wires, welding strips, transparent or non-transparent plastic wires. In this embodiment 1, the auxiliary wires 5 are made of the welding strips 4 of the busbar 2, and are connected to the welding strips 4 of the busbar 2 by welding.

[0042] In this embodiment 1, specifically, two adjacent photovoltaic cell strings 1 are connected in series via a busbar 2, one side of the busbar 2 is located on the front side of a busbar photovoltaic cell sheet, and the other side of the busbar 2 is located on the back side of another adjacent busbar photovoltaic cell sheet. Figure 7 and 8 In the figure, the number of auxiliary wires 5 on each side of the busbar 2 is 1, wherein the auxiliary wire 5 on the left is located on the back side of the welding strip 4 of the busbar 2, and the auxiliary wire 5 on the right is located on the front side of the welding strip 4 of the busbar 2.

[0043] The photovoltaic cells 3 of the photovoltaic cell string 1 are connected into a string through a longitudinally extending welding strip 4. The busbar photovoltaic cell is a photovoltaic cell 3 with positive and negative poles on different sides. The welding directions of the battery grid lines on the front and back sides of the busbar photovoltaic cell are perpendicular to each other, which are used to respectively adapt to the welding of the longitudinally extending welding strip 4 of the photovoltaic cell string 1 and the welding of the transversely extending welding strip 4 of the busbar welding rod 2.

[0044] The other photovoltaic cells 3 in the photovoltaic cell string 1 are also photovoltaic cells 3 with positive and negative poles on different sides. The positive and negative poles of these photovoltaic cells 3 are battery grid lines, and the welding directions of the battery grid lines serving as the positive pole and the battery grid lines serving as the negative pole are consistent, and are used to be connected into a string through a longitudinally extending welding strip 4.

[0045] The photovoltaic cells in the photovoltaic module of this embodiment 1 can all be multi-busbar photovoltaic cells. The electrode grid lines on the front and back of the multi-busbar photovoltaic cell are generally composed of battery busbars 8 and battery fine grid lines that are perpendicular to each other. The direction of the battery busbars 8 determines the welding direction of the battery grid lines. The battery busbars 8 are intermittent, and the battery fine grid lines are not shown in the attached drawings. According to the structure of the battery grid lines, there are three types of photovoltaic cells 3 in the photovoltaic module of this embodiment 1, such as Figure 1 and 2 As shown, the main grid lines 8 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 8 on the front side of the second photovoltaic cell 3-2 are longitudinal, and the battery busbars 8 on the back side are transverse. Figure 5 and 6 As shown, the battery busbar 8 of the front side of the third photovoltaic cell 3-3 is horizontal, and the battery busbar 8 of the back side is vertical. The second photovoltaic cell 3-2 and the third photovoltaic cell 3-3 are respectively used as busbar photovoltaic cells of two adjacent photovoltaic cell strings 1 connected by busbar welding rods 2.

[0046] The photovoltaic cell strings 1 in the photovoltaic module of this embodiment 1 are divided into two types.

[0047] like Fig. 9 , 10 As shown in 11, the first photovoltaic cell string 1-1 is formed by connecting n first photovoltaic cell sheets 3-1 and one second photovoltaic cell sheet 3-2 in series, the second photovoltaic cell sheet 3-2 is a busbar photovoltaic cell sheet, and is located at the tail of the photovoltaic cell string 1. The front side of the photovoltaic cell sheet 3 at the head of the first photovoltaic cell string 1-1 leads to a welding strip 4, and the front side of the second photovoltaic cell sheet 3-2 at the tail is welded to the longitudinally extending welding strip 4, and the welding strip 4 is not welded to the back side.

[0048] like Fig.12 , 13As shown in 14, the second photovoltaic cell string 1-2 is formed by connecting n pieces of the first photovoltaic cell 3-1 and one piece of the third photovoltaic cell 3-3 in series. The third photovoltaic cell 3-3 is a busbar photovoltaic cell and is located at the tail of the photovoltaic cell string 1. The back side of the photovoltaic cell 3 at the head of the first photovoltaic cell string 1-1 leads to a welding strip 4, and the back side of the third photovoltaic cell 3-3 at the tail is welded to the longitudinally extending welding strip 4, and the welding strip 4 is not welded to the front side.

[0049] The arrangement of the photovoltaic cell 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 9 is only on the side where the junction box is required, and the side without the junction box uses a bus welding rod 2 to connect the two adjacent photovoltaic cell strings 1 in series to replace the bus bar 9. The full series layout is that the junction box is on the head side of the photovoltaic module, and there is no bus bar 9 at the tail of the photovoltaic cell string 1. The head of the photovoltaic cell string 1 is connected through the bus bar 9 and connected to the junction box through the bus bar 9.

[0050] In this implementation 1, if Fig.16 As shown, the photovoltaic cell string 1 of the photovoltaic module 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 9 at the tail of the photovoltaic cell string 1, and the photovoltaic cell string 1 is connected in series through the bus welding rod 2. The junction box is not shown in the figure.

[0051] The preparation method of the photovoltaic module with the above-mentioned cell convergence of the present embodiment 1 is: prepare the photovoltaic cell string 1 and the busbar welding rod 2 respectively, in the layout step of the photovoltaic module, layout the photovoltaic cell string 1 and the busbar welding rod 2, layout the photovoltaic cell string 1 and the busbar welding rod 2 in place, in the lamination step of the photovoltaic module, under the lamination process conditions, the busbar welding rod 2 that is in place is welded to the converged photovoltaic cell sheet, and the connection between the two adjacent photovoltaic cell strings 1 is completed through the busbar welding rod 2.

[0052] In the layout step of the photovoltaic module, the specific steps of layout of the photovoltaic cell string 1 and the busbar welding rod 2 are: firstly, the photovoltaic cell string 1 is arranged in series, and then the busbar welding rod 2 and the busbar welding rod 2 are stacked in place.

[0053] The specific process of stacking the busbar welding rod 2 and the busbar photovoltaic cell piece into place is: first lift the last one or several photovoltaic cell pieces 3 at the end of the photovoltaic cell string 1, then stack one side of the busbar welding rod 2 under the lifted busbar photovoltaic cell piece of the photovoltaic cell string 1, and stack the other side of the busbar welding rod 2 on top of another adjacent busbar photovoltaic cell piece that has not been lifted, and then put down the lifted photovoltaic cell piece 3.

[0054] 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.

[0055] To prepare Fig.16 Taking the photovoltaic module shown in FIG. 1 as an example, the specific steps of the above preparation method are further described as follows:

[0056] 1) Preparation of photovoltaic cell string 1 and busbar welding rod 2:

[0057] The first photovoltaic cell string 1 - 1 , the second photovoltaic cell string 1 - 2 and the busbar welding rod 2 are welded respectively.

[0058] 2) Layout of photovoltaic modules:

[0059] The photovoltaic module includes various packaging layers and photovoltaic cell layers. The photovoltaic cell layer includes a photovoltaic cell string 1, a busbar 2, and a busbar 9 that connects the photovoltaic cell string 1 to the junction box. The packaging layers and photovoltaic cell layers are arranged in sequence. Because the side in contact with the bottom plate of the laminator should be as flat as possible during lamination, and the junction box of the photovoltaic module is generally installed on the back of the photovoltaic module, and there will be a busbar leading out of 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 placed face down into the laminator for lamination. Therefore, the photovoltaic module is generally arranged face down during the arrangement process, that is, the photovoltaic cells are placed face down during arrangement.

[0060] The layout steps of the photovoltaic cell layer in the layout steps of the photovoltaic module are as follows:

[0061] 2.1. Placing the photovoltaic cell string 1: Place the photovoltaic cell string 1 with the front side facing downward on the well-arranged front packaging structure according to the designed position. The side with the converging photovoltaic cell sheet, that is, the tail of the photovoltaic cell string 1, is at the head and tail position of the component, and the head of the photovoltaic cell string 1 is in the middle position. Fig.15 As shown, in Fig.15 In the figure, the photovoltaic cell strings 1 are all facing downward;

[0062] 2.2, Stitch welding:

[0063] Step 1: lift the arranged photovoltaic cell string 1 to further calibrate the string spacing;

[0064] Step 2: Complete the lap welding of the bus bar 9 at the middle position of the photovoltaic module;

[0065] Step 3: Stack the busbar welding rod 2 and the busbar photovoltaic cell in place. Fig.15Take the adjacent 2 strings of photovoltaic cells in the lower left corner as an example. For the specific process, see Fig.17 , lift the tail 1 to 3 photovoltaic cells 3 of the second photovoltaic cell string 1-2 on the left, carry the busbar 2 to the designed position and put it down, so that one side of the busbar 2 is stacked below the busbar photovoltaic cell (i.e., the third photovoltaic cell 3-3) of the second photovoltaic cell string 1-2 on the left (i.e., the front of the busbar photovoltaic cell), and the other side of the busbar 2 is stacked above another busbar photovoltaic cell of the first photovoltaic cell string 1-1 on the right (i.e., the back of the busbar photovoltaic cell), and align the welding strip 4 of the busbar 2 with the horizontal battery main grid line 8 of the busbar photovoltaic cell;

[0066] Step 4: Fig.17 Neutralization Fig.15 Taking the two adjacent photovoltaic cell strings 1 in the lower left corner as an example, the photovoltaic cell 3 of the second photovoltaic cell string 1-2 on the left side that has been lifted is put down, and the welding strip 4 of the busbar welding rod 2 is kept aligned with the battery main grid line 8 of the busbar photovoltaic cell during the putting down process;

[0067] Step 5: Fig.17 Neutralization Fig.15 Taking the two adjacent photovoltaic cell strings 1 in the lower left corner as an example, the busbar photovoltaic cell sheet (i.e., the third photovoltaic cell sheet 3-3) at the tail of the second photovoltaic cell string 1-2 on the left and the adhesive film of the front packaging structure below are ironed together through a heating point, and the busbar welding rod 2 and the busbar photovoltaic cell sheet are temporarily fixed. The auxiliary line 5 and the busbar photovoltaic cell sheet (i.e., the second photovoltaic cell sheet 3-2) at the tail of the first photovoltaic cell string 1-1 on the right are fixed by hot melt glue or UV glue, and the busbar welding rod 2 and the busbar photovoltaic cell sheet are temporarily fixed. This step 5 can be removed or added depending on the stability of the production line. Fig.15 The other adjacent photovoltaic cell strings 1 in the photovoltaic module are also stacked with the busbar welding rods 2 and the busbar welding rods according to the above steps. The busbar welding rods 2 of the adjacent photovoltaic cell strings 1 in the photovoltaic module can be stacked simultaneously.

[0068] 3) Lamination steps of photovoltaic modules:

[0069] During lamination, the lamination temperature is ensured to be higher than the melting temperature of the low-temperature welding layer of the welding strip 4 of the busbar welding rod 2, and the busbar welding rod 2 is welded to the busbar photovoltaic cell sheet to complete the series connection between two adjacent photovoltaic cell strings 1 through the busbar welding rod 2.

[0070] 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.

[0071] The welding of the photovoltaic cell string 1 in step 1 can be automated by a welding machine. Compared with a conventional welding machine, the only changes that need to be made to this welding machine are: adding two types of photovoltaic cell sheets 3 loading boxes, and changing the last photovoltaic cell sheet 3 of each photovoltaic cell string 1 to the second photovoltaic cell sheet 3-2 or the third photovoltaic cell sheet 3-3 during welding; the preparation of the busbar welding rod 2 in step 1 can be prepared in a special preparation device, and of course it is not excluded that it can be integrated in the stacking welding machine in step 2.2 to perform the preparation steps of the busbar welding rod 2 and the stacking steps of the busbar welding rod 2; the swinging string in step 2.1 can be automated by an existing swinging string machine; the stacking welding in step 2.2 can be automated by an existing stacking welding machine. Of course, in order to better lift the busbar welding rod 2, it is only necessary to change the size of the vacuum suction nozzle of the existing stacking welding machine for adsorbing the photovoltaic cell sheet 3 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 with the clamp.

[0072] The power and color of the three photovoltaic cells 3 of the photovoltaic cell string 1 are at the same level or similar levels.

[0073] Except for the welding strip 4 of the busbar welding rod 2 which is a low-temperature welding welding strip, the other welding strips 4 can be either low-temperature welding strips or normal welding strips.

[0074] The photovoltaic cells 3 of this embodiment 1 can also be busbar-free photovoltaic cells. Of course, it is not excluded that the electrode grid lines on the surface of the photovoltaic cells 3 are special patterns, and the welding direction can be vertical or horizontal, so that the photovoltaic module of this embodiment 1 can realize the solution of the present invention by using only one photovoltaic cell.

[0075] The photovoltaic cell strings 1 in the photovoltaic module can be an even number string or an odd number string. Fig.16 The photovoltaic cell strings 1 of the photovoltaic module are even-numbered strings, and the tails of the photovoltaic cell strings 1 are connected in series through busbars 2. Fig.18 When the photovoltaic cell strings 1 of the photovoltaic module are odd in number, one of the photovoltaic cell strings 1 can be connected to the junction box through a half-section busbar welding rod 2 welded on the busbar photovoltaic cell sheet at the tail and a busbar 9 as a jumper.

[0076] Example 2

[0077] This embodiment 2 is basically the same as embodiment 1, except that: Fig.19 and 20As shown, the auxiliary line 5 is replaced with an auxiliary rubber strip 6. The welding strips 4 on both sides of the busbar 2 are connected as a whole through the auxiliary rubber strip 6 crossing each welding strip 4. There are 1 to 5 auxiliary rubber strips 6 on each side of the busbar 2, and the auxiliary rubber strip 6 is bonded and connected to the welding strip 4 of the busbar 2. The auxiliary rubber strip 8 can be EVA, EPE, POE, PEP or PVB, etc., and the size can be a small strip of 1 to 10 mm wide. Because the auxiliary rubber strip 8 is a transparent material, it will be integrated with the packaging material after lamination. Compared with Example 1, the auxiliary line 5 cannot be seen on the final finished photovoltaic module of this Example 2, which will be more beautiful.

[0078] After the photovoltaic cell string 1 and the busbar welding rod 2 are arranged, the auxiliary adhesive strip 6 is fixed on the busbar welding rod 2 by heating, and the busbar welding rod 2 and the busbar welding rod 2 located above the busbar welding rod are temporarily fixed.

[0079] Example 3

[0080] This embodiment 3 is basically the same as embodiment 2, except that: Fig.21 As shown, the auxiliary adhesive strip 6 is expanded into a whole auxiliary adhesive film 7. The welding strips 4 on both sides of the busbar 2 are connected as a whole through the auxiliary adhesive film 7 covering the welding strips 4. The auxiliary adhesive film 7 is bonded to the welding strips 4 of the busbar 2. The size of the auxiliary adhesive film 7 is similar to that of the photovoltaic cell 3.

[0081] After the photovoltaic cell string 1 and the busbar welding rod 2 are arranged, the auxiliary adhesive film 7 is fixed on the busbar welding rod 2 by heating, and the busbar welding rod 2 and the busbar welding rod 2 located above the busbar welding rod are temporarily fixed.

Claims

1. A photovoltaic module with battery cell confluence, characterized by: It comprises a photovoltaic cell string (1) and a busbar welding rod (2), wherein the busbar welding rod (2) is used for connecting two adjacent photovoltaic cell strings (1); With the extension direction of the photovoltaic cell string (1) as the longitudinal direction, two adjacent photovoltaic cell strings (1) connected by a busbar welding rod (2) are arranged in parallel in the transverse direction, and both sides of the busbar welding rod (2) are respectively welded to the last photovoltaic cell sheet (3) at the same end of the two adjacent photovoltaic cell strings (1), and the last photovoltaic cell sheet (3) is called a busbar photovoltaic cell sheet; The busbar welding rod (2) comprises a plurality of welding strips (4) extending transversely and arranged in parallel with each other. The busbar welding rod (2) is welded to the busbar photovoltaic cell sheet via the welding strips (4). The welding strips (4) on both sides of the busbar welding rod (2) are connected as a whole via auxiliary lines (5) or auxiliary adhesive strips (6) crossing over the welding strips (4), or the welding strips (4) on both sides of the busbar welding rod (2) are connected as a whole via auxiliary adhesive films (7) covering the welding strips (4). The welding strips (4) of the busbar welding rod (2) are low-temperature welding welding strips.

2. The photovoltaic module with battery cells converging according to claim 1, characterized in that: The photovoltaic cells (3) of the photovoltaic cell string (1) are connected into a string via a longitudinally extending welding strip (4), and the welding directions of the battery grid lines on the front and back sides of the busbar photovoltaic cell are perpendicular to each other, so as to respectively adapt to the welding of the longitudinally extending welding strip (4) of the photovoltaic cell string (1) and the welding of the transversely extending welding strip (4) of the busbar welding rod (2).

3. The photovoltaic module with battery-cell convergence according to claim 1, characterized in that: The number of the auxiliary wires (5) on each side of the busbar welding rod (2) is 1 to 5, and the auxiliary wires (5) are connected to the welding strips (4) of the busbar welding rod (2) by welding or bonding; There are 1 to 5 auxiliary rubber strips (6) on each side of the busbar welding rod (2), and the auxiliary rubber strips (6) are bonded and connected to the welding strip (4) of the busbar welding rod (2); The auxiliary adhesive film (7) is bonded and connected to the welding strip (4) of the busbar welding rod (2); The auxiliary wire (5), the auxiliary adhesive strip (6) and the auxiliary adhesive film (7) are located on a side of the welding strip (4) of the busbar welding rod (2) that is away from the busbar photovoltaic cell sheet.

4. The photovoltaic module with battery-cell convergence according to claim 1, characterized in that: Two adjacent photovoltaic cell strings (1) are connected in series via a busbar welding rod (2), one side of the busbar welding rod (2) is located on the front side of a busbar welding cell sheet, and the other side of the busbar welding rod (2) is located on the back side of another adjacent busbar welding cell sheet.

5. A method for preparing a photovoltaic module with battery cells converging according to any one of claims 1 to 4, characterized in that: Photovoltaic cell strings (1) and busbar welding rods (2) are prepared respectively. In the layout step of the photovoltaic module, the photovoltaic cell strings (1) and the busbar welding rods (2) are laid out. In the lamination step of the photovoltaic module, under lamination process conditions, the busbar welding rods (2) are welded to the busbar photovoltaic cell sheets to complete the connection between two adjacent photovoltaic cell strings (1) through the busbar welding rods (2).

6. The method for preparing a photovoltaic module with battery cell convergence according to claim 5, characterized in that: When one side of the busbar welding rod (2) is located on the front side of a busbar welding cell sheet, and the other side of the busbar welding rod (2) is located on the back side of another adjacent busbar welding cell sheet, in the layout step of the photovoltaic module, the specific steps of layout of the photovoltaic cell string (1) and the busbar welding rod (2) are as follows: Firstly, the photovoltaic cell string (1) is arranged in a swaying manner, and then the busbar welding rod (2) and the busbar photovoltaic cell sheet are stacked in place; The specific process of stacking the busbar welding rod (2) and the busbar photovoltaic cell sheet in place is as follows: first, lift the last one or several photovoltaic cell sheets (3) at the end of the photovoltaic cell string (1), then stack one side of the busbar welding rod (2) below the lifted busbar photovoltaic cell sheet of the photovoltaic cell string (1), and stack the other side of the busbar welding rod (2) above another adjacent busbar photovoltaic cell sheet that has not been lifted, and then put down the lifted photovoltaic cell sheet (3).

7. The method for preparing a photovoltaic module with battery cell confluence according to claim 5, characterized in that: After the photovoltaic cell string (1) and the busbar welding rod (2) are arranged, the busbar welding rod (2) and the busbar photovoltaic cell sheet are temporarily fixed, and then the subsequent photovoltaic module arrangement steps are performed; When the busbar welding rod (2) is below the busbar photovoltaic cell sheet, the temporary fixing method is: the busbar photovoltaic cell sheet and the adhesive film of the front packaging structure below are ironed together through a heating point; When the busbar welding rod (2) is above the busbar photovoltaic cell sheet and the busbar welding rod (2) is connected as a whole through the auxiliary wire (5), the temporary fixing method is: fixing the auxiliary wire (5) and the busbar photovoltaic cell sheet through hot melt glue or UV glue; When the busbar welding rod (2) is above the busbar photovoltaic cell sheet and the busbar welding rod (2) is connected as a whole through the auxiliary adhesive strip (6) or the auxiliary adhesive film (7), the temporary fixing method is: the auxiliary adhesive strip (6) or the auxiliary adhesive film (7) is fixed on the busbar photovoltaic cell sheet by heating.

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