IBC cell, IBC cell assembly, and production method

Abstract

The present invention relates to the technical field of solar cells, and discloses an IBC cell, an IBC cell assembly, and a production method. An IBC cell main body comprises a first cell portion, a rectangular transition region, and a second cell portion. The first cell portion and the second cell portion are mirror-symmetrically arranged on two sides of the rectangular transition region. The length of the rectangular transition region in the transverse direction is a first preset distance 2d. Both the first cell portion and the second cell portion are provided with a positive electrode and a negative electrode on a backlight surface. The IBC cell assembly has first battery row units and second battery row units alternately arranged in the longitudinal direction. Each first battery row unit comprises N IBC cell main bodies arranged in the transverse direction. Each second battery row unit comprises N-1 IBC cell main bodies rotated by 180° and arranged in the transverse direction, and a first cell portion rotated by 180° and a second cell portion rotated by 180°, which are respectively arranged at two end sides of the N-1 IBC cell main bodies.

Description

An IBC solar cell, an IBC solar cell module, and a manufacturing method thereof. Technical Field

[0001] This invention relates to the field of solar cell technology, and in particular to an IBC cell, an IBC cell module, and a manufacturing method thereof. Background Technology

[0002] During the operation of a solar cell module, if one or more cells are shaded, the output voltage of the other cells connected in series with the shaded cell will be consumed by the shaded cell. This energy consumption can lead to local breakdown of the cell's PN junction and cause localized overheating, a phenomenon known as the hot spot effect. To prevent solar cells from being damaged by the hot spot effect, a common solution is to add bypass diodes to the original circuit. When the light is not blocked, each diode is reverse-biased, and each cell generates electrical energy. When a cell is shaded, it stops generating electrical energy, becoming a high-resistance resistor. Simultaneously, the other cells reverse-bias it, causing the diode connected to the two ends of the shaded cell to conduct, and the current that originally flowed through the shaded cell is diverted by the diode.

[0003] In the technology known to the inventor, Figure 1 shows a conventional battery cell, the main feature of which is that the positive and negative electrodes of the conventional battery cell 7 are separated on two sides of the cell. Figure 1-1 is a front view and Figure 1-2 is a rear view. Main grid lines are then printed on both sides, as shown in Figure 1, where the main grid line 7a is the positive electrode and the main grid line 7b is the negative electrode. If the conventional battery cells 7 are connected by interconnecting strips 8, the appearance is shown in Figure 2. Figure 2-1 is a rear view and Figure 2-2 is a side view. The interconnecting strips 8 are first soldered to the positive electrode main grid line 7a of the first battery cell, and then soldered to the negative electrode main grid line 7b of the second battery cell. This process is repeated to complete the battery string A.

[0004] If the battery string A is connected in series according to its positive and negative terminals, as shown in Figure 3, four battery strings A are connected in series by five bus bars 6 to form a photovoltaic module circuit. However, bypass diodes 9a and bypass diode circuits 9b are usually added to reduce shading losses caused by hot spots or shadows.

[0005] In recent years, IBC (Interdigitated Back Contact) solar cell technology has gradually gained attention due to the absence of main grid lines on the front side. In the technology known to the inventors, as shown in Figure 4, the electrodes of the existing IBC solar cell body 10 are all arranged on the back side, and the existing IBC solar cell front side 10a has no main grid lines, which can effectively reduce the optical loss caused by grid line shading and has better aesthetics. Figure 4-1 is a front view and Figure 4-2 is a rear view. The connection of the existing IBC cell body 10 is easier than the traditional cell 7 method, as shown in Figure 5. Figure 5-1 is a rear view and Figure 5-2 is a side view. By directly connecting the interconnecting strips 8 in series on the back of the cell, both the positive and negative electrodes are completed on the back of the cell. The interconnecting strips 8 are first welded to the negative electrode main grid line 10b of the first cell, and the negative electrode is led out. Then, another interconnecting strip 8 is welded to the positive electrode main grid line 10c on the back of the first cell and extended to the negative electrode main grid line 10b of the second cell. The above actions are repeated to complete the IBC cell string B.

[0006] If the battery string B is connected in series according to its positive and negative terminals, as shown in Figure 6, four battery strings B are connected in series by five bus bars 6 to form a photovoltaic module circuit. However, like traditional solar cell modules, it will still be affected by shading caused by hot spots or shadows. Therefore, bypass diodes 9a and bypass diode circuits 9b are usually added to reduce the shading loss caused by hot spots or shadows.

[0007] However, current IBC cell technology, even though it moves the electrodes to the back side during the cell string manufacturing process, still requires welding each cell individually into a string, arranging the strings, and then welding the busbars. This process is not significantly different from traditional cell manufacturing, resulting in minimal improvement in production efficiency. Furthermore, existing IBC cell modules do not offer any improvement in terms of hot spots and power loss caused by shading compared to traditional cells. Summary of the Invention

[0008] The purpose of this invention is to solve the above-mentioned technical problems and provide an IBC solar cell, an IBC solar cell module, and a manufacturing method thereof.

[0009] To achieve the above objectives, the present invention provides the following solution: The present invention discloses an IBC solar cell, comprising: an IBC solar cell body (1), a positive electrode and a negative electrode disposed on the backlight surface of the IBC solar cell body (1); the IBC solar cell body (1) includes a first solar cell portion (2), a rectangular transition area and a second solar cell portion (3), the first solar cell portion (2) and the second solar cell portion (3) are distributed on both sides of the rectangular transition area and form a mirror symmetry with the rectangular transition area as the axis of symmetry, the length of the rectangular transition area in the lateral direction is a first preset distance 2d, the positive electrode and the negative electrode are disposed on the backlight surface of the first solar cell portion (2) and the second solar cell portion (3), and the positive electrode and the negative electrode respectively have main grid lines; wherein, the first preset distance 2d is twice the distance between the main grid line of the positive electrode and the main grid line of the adjacent negative electrode.

[0010] The present invention also provides an IBC cell assembly having the above-mentioned IBC cell, the IBC cell assembly including an IBC cell array (4), the IBC cell array (4) including a first battery row unit and a second battery row unit arranged alternately in the longitudinal direction, the first battery row unit including N IBC cell bodies (1) arranged in the transverse direction, where N is a positive integer greater than 2, the second battery row unit including N-1 IBC cell bodies (1) arranged in the transverse direction and rotated by 180°, and a first battery cell portion (2) and a second battery cell portion (3) respectively arranged at both ends of the N-1 IBC cell bodies (1) and rotated by 180°; the distance between the IBC cell body (1) and the first battery cell portion (2) or the second battery cell portion (3) in the transverse direction is a second preset distance d, and the distance between the IBC cell bodies (1) in the transverse direction is a first preset distance 2d.

[0011] The present invention also provides an IBC cell assembly having the above-mentioned IBC cell, the IBC cell assembly including an IBC cell array (4), the IBC cell array (4) including a first cell row unit and a second cell row unit arranged alternately in the longitudinal direction, the first cell row unit including N IBC cell bodies (1) arranged in the transverse direction and a first cell portion (2) or a second cell portion (3) arranged on one side of one of the two ends of the N IBC cell bodies (1), where N is a positive integer greater than 2; The second battery row unit includes N IBC battery cell bodies (1) arranged in the lateral direction after being rotated 180°, and a second battery cell portion (3) or a first battery cell portion (2) arranged on the other side of one of the two ends of the N IBC battery cell bodies (1) after being rotated 180°; the distance in the lateral direction between the IBC battery cell body (1) and the first battery cell portion (2) or the second battery cell portion (3) is a second preset distance d, and the distance in the lateral direction between the IBC battery cell bodies (1) is a first preset distance 2d.

[0012] In one embodiment, the positive electrode includes a first positive electrode portion disposed in the first battery row cell and a second positive electrode portion disposed in a second battery row cell adjacent to the first battery row cell; the negative electrode includes a first negative electrode portion disposed in the first battery row cell and a second negative electrode portion disposed in the second battery row cell adjacent to the first battery row cell; the first positive electrode portion includes a plurality of first positive electrode connection points for connection with a welding wire and a first positive electrode main grid line connecting adjacent first positive electrode connection points; the first negative electrode portion includes a plurality of first negative electrode connection points for connection with a welding wire and a first negative electrode main grid line connecting adjacent first negative electrode connection points; the second positive electrode portion includes a plurality of second positive electrode connection points for connection with a welding wire and a second positive electrode main grid line connecting adjacent second positive electrode connection points; the second negative electrode portion includes a plurality of second negative electrode connection points for connection with a welding wire and a second negative electrode main grid line connecting adjacent second negative electrode connection points; the extension directions of the first positive electrode main grid line and the second negative electrode main grid line coincide, and the extension directions of the first negative electrode main grid line and the second positive electrode main grid line coincide.

[0013] In one embodiment, the IBC cell assembly further includes busbars (6) disposed at the upper and lower ends of the IBC cell array (4) along the lateral direction.

[0014] In one embodiment, the IBC cell assembly is formed by roll-welding a carrier film (5) with welding wire (5a) to weld the busbar (6) to the first and second battery row units to form a circuit.

[0015] In one embodiment, the welding wire (5a) in the carrier film (5) welds the third positive electrode connection grid line and the fourth negative electrode connection grid line together or welds the third negative electrode connection grid line and the fourth positive electrode connection grid line together.

[0016] In one embodiment, the welding wire (5a) in the carrier film (5) welds the third positive electrode connection grid line and the fourth negative electrode connection grid line together, and welds the third negative electrode connection grid line and the fourth positive electrode connection grid line together, and removes the welding wire (5a) that causes a short circuit by laser.

[0017] The present invention also provides a method for producing an IBC cell module having the above-described IBC cells, characterized in that the production method includes:

[0018] Step S1: The original IBC cell is symmetrically divided into a first cell part (2) and a second cell part (3) along the longitudinal center line. The first cell part (2) and the second cell part (3) are moved to the sides by a distance d, so that the distance between the first cell part (2) and the second cell part (3) in the lateral direction is a first preset distance 2d and they are connected in series to form the IBC cell body (1). The first preset distance 2d is twice the distance between the positive electrode main grid line and the adjacent negative electrode main grid line.

[0019] Step S2: Arrange N IBC cell bodies (1) in the horizontal direction to form a first battery row unit, where N is a positive integer greater than 2; arrange N-1 IBC cell bodies (1) rotated 180° and the first battery cell segments (2) and second battery cell segments (3) respectively arranged on both sides of the N-1 IBC cell bodies (1) rotated 180° in the horizontal direction to form a second battery row unit; alternately arrange the first battery row unit and the second battery row unit in the vertical direction to form an IBC cell array; the distance in the horizontal direction between the IBC cell body (1) and the first battery cell segment (2) or the second battery cell segment (3) is a second preset distance d, and the distance in the horizontal direction between the IBC cell bodies (1) is a first preset distance 2d;

[0020] Step S3: Place busbars (6) at the top and bottom of the IBC cell array (4);

[0021] Step S4: Place the carrier film (5) with welding wire (5a) on the IBC cell array (4), and weld the welding wire (5a) and carrier film (5) to the electrode of the cell and attach them to the back of the cell by roll welding.

[0022] The present invention also provides a method for producing an IBC cell module having the above-described IBC cells, characterized in that the production method includes:

[0023] Step S1: The original IBC cell is symmetrically divided into a first cell part (2) and a second cell part (3) along the longitudinal center line. The first cell part (2) and the second cell part (3) are moved to the sides by a distance d, so that the distance between the first cell part (2) and the second cell part (3) in the lateral direction is a first preset distance 2d and they are connected in series to form the IBC cell body (1). The first preset distance 2d is twice the distance between the positive electrode main grid line and the adjacent negative electrode main grid line.

[0024] Step S2: Arrange N IBC cell bodies (1) and a first cell portion (2) or a second cell portion (3) arranged on one side of the N IBC cell bodies (1) in the horizontal direction to form a first battery row unit, where N is a positive integer greater than 2; Arrange N IBC cell bodies (1) rotated 180° and a first cell portion (2) or a second cell portion (3) arranged on the other side of the N IBC cell bodies (1) in the horizontal direction to form a second battery row unit; Alternately arrange the first battery row unit and the second battery row unit in the vertical direction to form an IBC cell array; The horizontal distance between the IBC cell bodies (1) and the first cell portion (2) or the second cell portion (3) is a second preset distance d, and the horizontal distance between the IBC cell bodies (1) is a first preset distance 2d;

[0025] Step S3: Place busbars (6) at the top and bottom of the IBC cell array (4);

[0026] Step S4: Place the carrier film (5) with welding wire (5a) on the IBC cell array (4), and weld the welding wire (5a) and carrier film (5) to the electrode of the cell and attach them to the back of the cell by roll welding.

[0027] In one embodiment, in step S4, the welding wire (5a) causing the short circuit is removed by laser.

[0028] In one embodiment, in step S4, the IBC cell array (4) is conveyed to a heated conveying platform passing through a foam hot press roller.

[0029] The present invention achieves the following technical effects compared to the prior art:

[0030] The IBC solar cell proposed in this invention can split a traditional solar cell in half and then weld them in series. The open-circuit voltage of each half remains unchanged, but the current is halved. According to Joule's law, the internal loss of the half-cell is reduced to 1 / 4 of its original value, improving the overall output power and efficiency of the module. This invention can directly weld the solar cells of an entire module through a carrier film to complete the circuit of the entire module, eliminating the need to weld each solar cell individually, thus significantly improving efficiency. The IBC solar cell module in this invention features a staggered matrix layout, which effectively reduces hot spots and power losses caused by cell shading and eliminates the need for additional bypass diodes. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 shows the front and rear views of an existing conventional solar cell;

[0033] Figure 2 shows the rear and side views of existing conventional solar cells welded into strings;

[0034] Figure 3 is a schematic diagram of the structure of a photovoltaic module composed of existing traditional solar cells;

[0035] Figure 4 shows the front and rear views of an existing IBC solar cell;

[0036] Figure 5 shows the rear and side views of existing IBC solar cells welded into strings;

[0037] Figure 6 is a schematic diagram of the structure of a photovoltaic module composed of existing IBC cells;

[0038] Figure 7 is a schematic diagram of the structure of an IBC battery cell in one or more embodiments of the present invention;

[0039] Figure 8 is a rear view of an IBC cell assembly according to one or more embodiments of the present invention;

[0040] Figure 9 is a rear view of an IBC cell assembly according to one or more embodiments of the present invention;

[0041] Figure 10 is a schematic diagram of the structure of a support membrane with welding wire in one or more embodiments of the present invention;

[0042] Figure 11 is a schematic diagram of the laser removal of a portion of the welding wire in one or more embodiments of the present invention;

[0043] Figure 12 is a schematic diagram of laser cutting off a portion of the welding wire in one or more embodiments of the present invention;

[0044] Figure 13 is a front view of an IBC cell assembly according to one or more embodiments of the present invention;

[0045] Figure 14 is a flowchart of an IBC cell module manufacturing method according to one or more embodiments of the present invention.

[0046] Figure 15 is a flowchart of an IBC cell module manufacturing method according to one or more embodiments of the present invention.

[0047] Explanation of reference numerals in the attached drawings: 1. IBC cell body; 2. First cell section; 3. Second cell section; 4. IBC cell array; 5. Carrier film; 5a. Welding wire; 6. Busbar; 7. Conventional cell; 7a. Main grid line of the positive electrode of the conventional cell; 7b. Main grid line of the negative electrode of the conventional cell; 8. Interconnection strip; 9a. Bypass diode; 9b. Bypass diode circuit; 10. Existing IBC cell body; 10a. Front side of the existing IBC cell; 10b. Main grid line of the negative electrode of the existing IBC cell; 10c. Main grid line of the positive electrode of the existing IBC cell; 12. First cell; 13. Second cell; 14. Third cell. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Please refer to Figures 1 to 15, where Figures 1 to 6 represent the prior art, and Figures 7 to 15 represent the technical solutions provided by the present invention:

[0050] Example 1

[0051] As shown in Figure 7, this embodiment provides an IBC solar cell, including: an IBC solar cell body 1, a positive electrode and a negative electrode disposed on the backlight surface of the IBC solar cell body 1; the IBC solar cell body 1 includes a first solar cell portion 2, a rectangular transition area and a second solar cell portion 3, the first solar cell portion 2 and the second solar cell portion 3 are distributed on both sides of the rectangular transition area and form a mirror symmetry with the rectangular transition area as the axis of symmetry, the length of the rectangular transition area in the lateral direction is a first preset distance 2d, the positive electrode and the negative electrode are disposed on the backlight surface of the first solar cell portion 2 and the second solar cell portion 3, and the positive electrode and the negative electrode respectively have main grid lines; the first preset distance 2d is twice the distance between the main grid line of the positive electrode and the main grid line of the adjacent negative electrode.

[0052] In one embodiment, the IBC cell body 1 of this application can be designed and manufactured directly.

[0053] Example 2

[0054] This embodiment provides an IBC cell assembly, which includes an IBC cell array 4. The IBC cell array 4 includes a first battery row unit and a second battery row unit, which are arranged alternately in the longitudinal direction. The first battery row unit includes N IBC cell bodies 1 of Embodiment 1 arranged in the transverse direction, where N is a positive integer greater than 2. The second battery row unit includes N-1 IBC cell bodies 1 arranged in the transverse direction and rotated by 180°, and first battery cell portions 2 and second battery cell portions 3 arranged at both ends of the N-1 IBC cell bodies 1 and rotated by 180° respectively. The distance between the IBC cell body 1 and the first battery cell portion 2 or the second battery cell portion 3 in the transverse direction is a second preset distance d, and the distance between the IBC cell bodies 1 in the transverse direction is a first preset distance 2d. As shown in Figure 8, the IBC cell body 1 and the first cell segment 2 or the second cell segment 3 are arranged alternately to form the first column. It should be noted that the first cell row unit can be either an odd-numbered row of cells in the figure or an even-numbered row of cells in Figure 8. This invention does not limit this.

[0055] In one embodiment, adjusting the number and arrangement of the IBC cell bodies 1 can adjust until the desired IBC cell module voltage and current are achieved. As shown in FIG8, increasing the number M of cells in a column can increase the current of the IBC cell module, while increasing the number N of columns can increase the voltage of the IBC cell module.

[0056] In one embodiment, the IBC cell assembly includes a positive electrode and a negative electrode disposed on the backlight surfaces of the IBC cell body 1, the first cell portion 2, and the second cell portion 3; the positive electrode includes a first positive electrode portion disposed in a first cell row unit and a second positive electrode portion disposed in a second cell row unit adjacent to the first cell row unit; the negative electrode includes a first negative electrode portion disposed in the first cell row unit and a second negative electrode portion disposed in a second cell row unit adjacent to the first cell row unit; the first positive electrode portion includes a plurality of first positive electrode connection points for connection with welding wire, and connections to adjacent first positive electrodes. The first positive electrode main grid line of the connection point includes a first negative electrode portion comprising multiple first negative electrode connection points for connection with the welding wire, and a first negative electrode main grid line connecting adjacent first negative electrode connection points; the second positive electrode portion comprises multiple second positive electrode connection points for connection with the welding wire, and a second positive electrode main grid line connecting adjacent second positive electrode connection points; the second negative electrode portion comprises multiple second negative electrode connection points for connection with the welding wire, and a second negative electrode main grid line connecting adjacent second negative electrode connection points; the extension directions of the first positive electrode main grid line and the second negative electrode main grid line coincide, and the extension directions of the first negative electrode main grid line and the second positive electrode main grid line coincide.

[0057] In one embodiment, the IBC cell assembly further includes busbars 6 disposed at the upper and lower ends of the IBC cell array 4 in a transverse direction.

[0058] In one embodiment, the IBC cell assembly is formed by roll-welding a carrier film 5 with welding wire 5a to weld the busbar 6 to the first and second cell rows to form a circuit.

[0059] In one embodiment, the welding wire 5a in the carrier membrane 5 welds the third positive electrode connection grid line and the fourth negative electrode connection grid line together or welds the third negative electrode connection grid line and the fourth positive electrode connection grid line together.

[0060] In one embodiment, the welding wire 5a in the carrier film 5 welds the third positive electrode connection grid line and the fourth negative electrode connection grid line together, and welds the third negative electrode connection grid line and the fourth positive electrode connection grid line together, and removes the welding wire 5a that causes a short circuit by laser.

[0061] In one embodiment, after the cell arrangement is completed, the entire module circuit can be completed by roll welding using the carrier film 5, eliminating the need to weld each cell individually, thus significantly improving efficiency. Simultaneously, the IBC cell module in this embodiment uses a staggered matrix layout, effectively reducing hot spots and power losses caused by cell shading. As shown in Figure 12, the short-circuited welding wire 5a is laser-cut to form a complete module circuit, as shown in Figure 12, with the cut position D. By arranging the IBC cells in a staggered matrix configuration in this embodiment, even with some cells shading (as shown in Figure 13), when the first cell 12 is shaded, no additional bypass diode is needed; current can flow through the second cell 13 and the third cell 14, effectively preventing hot spots from appearing on the first cell 12. The power loss is only the power generated by the shaded first cell 12. Compared to the prior art IBC module in Figure 6, under the same conditions, this avoids 50% of the module power loss.

[0062] Example 3

[0063] This embodiment provides an IBC cell assembly, as shown in FIG9. The IBC cell assembly includes an IBC cell array 4, which includes a first cell row unit and a second cell row unit. The first cell row unit and the second cell row unit are alternately arranged in the longitudinal direction. The first cell row unit includes N IBC cell bodies 1 of Embodiment 1 arranged in the transverse direction and a first cell portion 2 or a second cell portion 3 arranged on one of the two ends of the N IBC cell bodies 1, where N is a positive integer greater than 2. The second cell row unit includes N IBC cell bodies 1 arranged in the transverse direction after being rotated 180° and a first cell portion 2 or a second cell portion 3 arranged on the other end of the N IBC cell bodies 1. The distance between the IBC cell bodies 1 and the first cell portion 2 or the second cell portion 3 in the transverse direction is a second preset distance d, and the distance between the IBC cell bodies 1 in the transverse direction is a first preset distance 2d.

[0064] In one embodiment, the IBC cell assembly includes a positive electrode and a negative electrode disposed on the backlight surfaces of the IBC cell body 1, the first cell portion 2, and the second cell portion 3; the positive electrode includes a first positive electrode portion disposed in a first cell row unit and a second positive electrode portion disposed in a second cell row unit adjacent to the first cell row unit; the negative electrode includes a first negative electrode portion disposed in the first cell row unit and a second negative electrode portion disposed in a second cell row unit adjacent to the first cell row unit; the first positive electrode portion includes a plurality of first positive electrode connection points for connection with welding wire, and connections to adjacent first positive electrodes. The first positive electrode main grid line of the connection point includes a first negative electrode portion comprising multiple first negative electrode connection points for connection with the welding wire, and a first negative electrode main grid line connecting adjacent first negative electrode connection points; the second positive electrode portion comprises multiple second positive electrode connection points for connection with the welding wire, and a second positive electrode main grid line connecting adjacent second positive electrode connection points; the second negative electrode portion comprises multiple second negative electrode connection points for connection with the welding wire, and a second negative electrode main grid line connecting adjacent second negative electrode connection points; the extension directions of the first positive electrode main grid line and the second negative electrode main grid line coincide, and the extension directions of the first negative electrode main grid line and the second positive electrode main grid line coincide.

[0065] In one embodiment, the IBC cell assembly further includes busbars 6 disposed at the upper and lower ends of the IBC cell array 4 in a transverse direction.

[0066] In one embodiment, the IBC cell assembly is formed by roll-welding a carrier film 5 with welding wire 5a to weld the busbar 6 to the first and second cell rows to form a circuit.

[0067] In one embodiment, the welding wire 5a in the carrier membrane 5 welds the third positive electrode connection grid line and the fourth negative electrode connection grid line together or welds the third negative electrode connection grid line and the fourth positive electrode connection grid line together.

[0068] In one embodiment, the welding wire 5a in the carrier film 5 welds the third positive electrode connection grid line and the fourth negative electrode connection grid line together, and welds the third negative electrode connection grid line and the fourth positive electrode connection grid line together, and removes the welding wire 5a that causes a short circuit by laser.

[0069] In one embodiment, after the cell arrangement is completed, the entire module circuit can be completed by roll welding using the carrier film 5, eliminating the need to weld each cell individually, thus significantly improving efficiency. Simultaneously, the IBC cell module in this embodiment uses a staggered matrix layout, effectively reducing hot spots and power losses caused by cell shading. As shown in Figure 12, the short-circuited welding wire 5a is laser-cut to form a complete module circuit, as shown in Figure 12, with the cut position D. By arranging the IBC cells in a staggered matrix configuration in this embodiment, even with some cells shading (as shown in Figure 13), when the first cell 12 is shaded, no additional bypass diode is needed; current can flow through the second cell 13 and the third cell 14, effectively preventing hot spots from appearing on the first cell 12. The power loss is only the power generated by the shaded first cell 12. Compared to the prior art IBC module in Figure 6, under the same conditions, this avoids 50% of the module power loss.

[0070] Example 4

[0071] This embodiment provides a method for producing an IBC cell module having the IBC cell from Embodiment 1, as shown in Figure 14. The production method includes:

[0072] Step S1: The original IBC cell is symmetrically divided into a first cell portion 2 and a second cell portion 3 along the longitudinal centerline. The first cell portion 2 and the second cell portion 3 are moved to the sides by a distance d, so that the distance between the first cell portion 2 and the second cell portion 3 in the lateral direction is a first preset distance 2d, and they are connected in series to form the IBC cell body 1. The first preset distance 2d is twice the distance between the positive electrode main grid line and the adjacent negative electrode main grid line.

[0073] Step S2: Arrange N IBC cell bodies 1 in the horizontal direction to form a first battery row unit, where N is a positive integer greater than 2; arrange N-1 IBC cell bodies 1 rotated 180° and the first battery cell segments 2 and second battery cell segments 3, respectively arranged at both ends of the N-1 IBC cell bodies 1 rotated 180°, in the horizontal direction to form a second battery row unit; alternately arrange the first battery row unit and the second battery row unit in the vertical direction to form an IBC cell array 4; the horizontal distance between the IBC cell body 1 and the first battery cell segment 2 or the second battery cell segment 3 is a second preset distance d, and the horizontal distance between the IBC cell bodies 1 is a first preset distance 2d;

[0074] Step S3: Place busbars 6 at the top and bottom of the IBC cell array 4 respectively;

[0075] Step S4: Place the carrier film 5 with welding wire 5a on the IBC cell array 4, and weld the welding wire 5a and the carrier film 5 to the electrode of the cell and attach them to the back of the cell by roll welding.

[0076] In one embodiment, in step S4, the welding wire 5a that caused the short circuit is removed by laser.

[0077] In one embodiment, in step S4, the IBC cell array 4 is conveyed to a heated conveying platform passing through a foam hot press roller.

[0078] Example 5

[0079] This embodiment provides a method for producing an IBC cell module having the IBC cell from Embodiment 1, as shown in Figure 15. The production method includes:

[0080] Step S1: The original IBC cell is symmetrically divided into a first cell portion 2 and a second cell portion 3 along the longitudinal centerline. The first cell portion 2 and the second cell portion 3 are moved to the sides by a distance d, so that the distance between the first cell portion 2 and the second cell portion 3 in the lateral direction is a first preset distance 2d, and they are connected in series to form the IBC cell body 1. The first preset distance 2d is twice the distance between the positive electrode main grid line and the adjacent negative electrode main grid line.

[0081] Step S2: Arrange N IBC cell bodies 1 and the first cell segment 2 or the second cell segment 3 arranged on one of the two ends of the N IBC cell bodies 1 in the horizontal direction to form a first battery row unit, where N is a positive integer greater than 2; Arrange N IBC cell bodies 1 rotated 180° and the first cell segment 2 or the second cell segment 3 arranged on the other end of the N IBC cell bodies 1 in the horizontal direction to form a second battery row unit; Alternately arrange the first battery row unit and the second battery row unit in the vertical direction to form an IBC cell array 4; The horizontal distance between the IBC cell bodies 1 and the first cell segment 2 or the second cell segment 3 is a second preset distance d, and the horizontal distance between the IBC cell bodies 1 is a first preset distance 2d;

[0082] Step S3: Place busbars 6 at the top and bottom of the IBC cell array 4 respectively;

[0083] Step S4: Place the carrier film 5 with welding wire 5a on the IBC cell array 4, and weld the welding wire 5a and the carrier film 5 to the electrode of the cell and attach them to the back of the cell by roll welding.

[0084] In one embodiment, in step S4, the welding wire 5a that caused the short circuit is removed by laser.

[0085] In one embodiment, in step S4, the IBC cell array 4 is conveyed to a heated conveying platform passing through a foam hot press roller.

[0086] The parts of this invention not described herein are prior art.

[0087] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An IBC solar cell, characterized in that, include: IBC cell body (1), positive electrode and negative electrode disposed on the backlight surface of the IBC cell body (1); the IBC cell body (1) includes a first cell portion (2), a rectangular transition area and a second cell portion (3), the first cell portion (2) and the second cell portion (3) are distributed on both sides of the rectangular transition area and form a mirror symmetry with the rectangular transition area as the axis of symmetry, the length of the rectangular transition area in the lateral direction is a first preset distance 2d, the positive electrode and the negative electrode are disposed on the backlight surface of the first cell portion (2) and the second cell portion (3), the positive electrode and the negative electrode respectively have main grid lines; wherein, the first preset distance 2d is twice the distance between the main grid line of the positive electrode and the main grid line of the adjacent negative electrode.

2. An IBC cell assembly having the IBC cell as described in claim 1, characterized in that, The IBC cell assembly includes an IBC cell array (4), which includes a first cell row unit and a second cell row unit arranged alternately in the longitudinal direction. The first cell row unit includes N IBC cell bodies (1) arranged in the transverse direction, where N is a positive integer greater than 2. The second cell row unit includes N-1 IBC cell bodies (1) arranged in the transverse direction and rotated by 180°, and a first cell portion (2) and a second cell portion (3) arranged at both ends of the N-1 IBC cell bodies (1) and rotated by 180° respectively. The distance between the IBC cell body (1) and the first cell portion (2) or the second cell portion (3) in the transverse direction is a second preset distance d, and the distance between the IBC cell bodies (1) in the transverse direction is a first preset distance 2d.

3. An IBC cell module having the IBC cell as described in claim 1, characterized in that, The IBC cell assembly includes an IBC cell array (4), which includes a first cell row unit and a second cell row unit arranged alternately in the longitudinal direction. The first cell row unit includes N IBC cell bodies (1) arranged in the transverse direction and a first cell portion (2) or a second cell portion (3) arranged on one side of one of the N IBC cell bodies (1), where N is a positive integer greater than 2. The second cell row unit includes N IBC cell bodies (1) arranged in the transverse direction after being rotated 180° and a second cell portion (3) or a first cell portion (2) arranged on the other side of one of the N IBC cell bodies (1) after being rotated 180°. The distance between the IBC cell bodies (1) and the first cell portion (2) or the second cell portion (3) in the transverse direction is a second preset distance d, and the distance between the IBC cell bodies (1) in the transverse direction is a first preset distance 2d.

4. The IBC cell assembly according to claim 2 or 3, characterized in that, The positive electrode includes a first positive electrode portion disposed in the first battery row unit and a second positive electrode portion disposed in the second battery row unit adjacent to the first battery row unit; the negative electrode includes a first negative electrode portion disposed in the first battery row unit and a second negative electrode portion disposed in the second battery row unit adjacent to the first battery row unit; the first positive electrode portion includes a plurality of first positive electrode connection points for connection with a welding wire and a first positive electrode main grid line connecting adjacent first positive electrode connection points; the first negative electrode portion includes a plurality of first negative electrode connection points for connection with a welding wire and a first negative electrode main grid line connecting adjacent first negative electrode connection points; the second positive electrode portion includes a plurality of second positive electrode connection points for connection with a welding wire and a second positive electrode main grid line connecting adjacent second positive electrode connection points; the second negative electrode portion includes a plurality of second negative electrode connection points for connection with a welding wire and a second negative electrode main grid line connecting adjacent second negative electrode connection points; the extension directions of the first positive electrode main grid line and the second negative electrode main grid line coincide, and the extension directions of the first negative electrode main grid line and the second positive electrode main grid line coincide.

5. The IBC solar cell module according to claim 4, characterized in that, The IBC cell assembly also includes busbars (6) disposed at the upper and lower ends of the IBC cell array (4) along the lateral direction.

6. The IBC cell module according to claim 5, characterized in that, The IBC cell assembly is formed by rolling and welding a carrier film (5) with welding wire (5a) to the busbar (6) and the first and second battery row units to form a circuit.

7. The IBC solar cell module according to claim 6, characterized in that, The welding wire (5a) in the carrier film (5) welds the third positive electrode connecting grid line and the fourth negative electrode connecting grid line together or welds the third negative electrode connecting grid line and the fourth positive electrode connecting grid line together.

8. The IBC solar cell module according to claim 6, characterized in that, The welding wire (5a) in the carrier film (5) welds the third positive electrode connecting grid line and the fourth negative electrode connecting grid line together, and welds the third negative electrode connecting grid line and the fourth positive electrode connecting grid line together. The welding wire (5a) that causes a short circuit is removed by laser.

9. A method for producing an IBC cell module having the IBC cell as described in claim 1, characterized in that, The production method includes: Step S1: The original IBC cell is symmetrically divided into a first cell part (2) and a second cell part (3) along the longitudinal center line. The first cell part (2) and the second cell part (3) are moved to the sides by a distance d, so that the distance between the first cell part (2) and the second cell part (3) in the lateral direction is a first preset distance 2d and they are connected in series to form the IBC cell body (1). The first preset distance 2d is twice the distance between the positive electrode main grid line and the adjacent negative electrode main grid line. Step S2: Arrange N IBC cell bodies (1) in the horizontal direction to form a first battery row unit, where N is a positive integer greater than 2; arrange N-1 IBC cell bodies (1) rotated 180° and the first battery cell segments (2) and second battery cell segments (3) respectively arranged on both sides of the N-1 IBC cell bodies (1) rotated 180° in the horizontal direction to form a second battery row unit; alternately arrange the first battery row unit and the second battery row unit in the vertical direction to form an IBC cell array; the distance in the horizontal direction between the IBC cell body (1) and the first battery cell segment (2) or the second battery cell segment (3) is a second preset distance d, and the distance in the horizontal direction between the IBC cell bodies (1) is a first preset distance 2d; Step S3: Place busbars (6) at the top and bottom of the IBC cell array (4); Step S4: Place the carrier film (5) with welding wire (5a) on the IBC cell array (4), and weld the welding wire (5a) and carrier film (5) to the electrode of the cell and attach them to the back of the cell by roll welding.

10. A method for producing an IBC cell module having the IBC cell as described in claim 1, characterized in that, The production method includes: Step S1: The original IBC cell is symmetrically divided into a first cell part (2) and a second cell part (3) along the longitudinal center line. The first cell part (2) and the second cell part (3) are moved to the sides by a distance d, so that the distance between the first cell part (2) and the second cell part (3) in the lateral direction is a first preset distance 2d and they are connected in series to form the IBC cell body (1). The first preset distance 2d is twice the distance between the positive electrode main grid line and the adjacent negative electrode main grid line. Step S2: Arrange N IBC cell bodies (1) and a first cell portion (2) or a second cell portion (3) arranged on one side of the N IBC cell bodies (1) in the horizontal direction to form a first battery row unit, where N is a positive integer greater than 2; Arrange N IBC cell bodies (1) rotated 180° and a first cell portion (2) or a second cell portion (3) arranged on the other side of the N IBC cell bodies (1) in the horizontal direction to form a second battery row unit; Alternately arrange the first battery row unit and the second battery row unit in the vertical direction to form an IBC cell array; The horizontal distance between the IBC cell bodies (1) and the first cell portion (2) or the second cell portion (3) is a second preset distance d, and the horizontal distance between the IBC cell bodies (1) is a first preset distance 2d; Step S3: Place busbars (6) at the top and bottom of the IBC cell array (4); Step S4: Place the carrier film (5) with welding wire (5a) on the IBC cell array (4), and weld the welding wire (5a) and carrier film (5) to the electrode of the cell and attach them to the back of the cell by roll welding.

11. The production method according to claim 9 or 10, characterized in that, In step S4, the welding wire that caused the short circuit is removed by laser (5a).

12. The production method according to claim 11, characterized in that, In step S4, the IBC cell array (4) is conveyed to a heated conveying platform passing through a foam hot press roller.

Images