IBC battery cell, assembly and production method thereof

Abstract

The present invention relates to the technical field of solar cells, and specifically to an IBC cell, an assembly and a production method thereof. The main body of the IBC cell comprises a first cell division, a rectangular transition zone, and a second cell division. The first cell division and the second cell division are mirror-symmetrical on both sides of the rectangular transition zone. The length of the rectangular transition zone along the transverse direction is a first preset distance 2d. The first cell division and the second cell division are provided with a positive electrode and a negative electrode on the backlight surface. The IBC cell assembly alternately arranges the first battery row unit and the second battery row unit along the longitudinal direction. The first battery row unit comprises N IBC cell bodies arranged along the transverse direction, and the second battery row unit comprises N-1 IBC cell bodies arranged along the transverse direction and rotated by 180°, and the first cell division and the second cell division respectively arranged on both end sides of the N-1 IBC cell bodies and rotated by 180°.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cells, in particular to an IBC cell sheet, a component and a production method thereof. Background Art

[0002] During the operation of a solar cell module, if a shadow blocks one or some cells, the output voltage of other cells connected in series with the shadowed cell will be consumed by the cell. This energy consumption will cause local breakdown of the cell PN junction and cause local overheating, which is the hot spot effect. In order to prevent solar cells from being damaged by the hot spot effect, the usual solution is to add bypass diodes to the original circuit. When the light is not blocked, each diode is in reverse bias and each cell is generating electricity. When a cell is blocked, it stops generating electricity and becomes a high-resistance resistor. At the same time, other cells cause it to be reverse biased, causing the diodes connecting the two ends of the cell to turn on, and the current that originally flowed through the blocked cell is shunted by the diode.

[0003] In the prior art, Figure 1 It is 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 battery cell, wherein: Figure 1 a is the front view, Figure 1 b is the rear view, and then the main grid lines are printed on both sides. Figure 1 The traditional cell positive electrode busbar 7a and the traditional cell negative electrode busbar 7b. If the traditional cell 7 is connected by the interconnection strip 8, the appearance is as follows Figure 2 As shown, Figure 2 a is the rear view, Figure 2 b is a side view, in which the interconnection strip 8 is first welded to the conventional positive electrode busbar 7a of the front side of the first cell, and then moves to the conventional negative electrode busbar 7b of the rear side of the second cell to be welded. The battery string A can be completed by repeating the above actions.

[0004] If the battery string A is connected in series according to its positive and negative poles, such as Figure 3 As shown, four battery strings A are connected in series with five bus bars 6 to form a photovoltaic component loop, but bypass diodes 9a and bypass diode loops 9b are generally added to reduce shading losses caused by hot spots or shadows.

[0005] In recent years, IBC (Interdigitated Back Contact) cell technology has gradually attracted attention because it has no main grid line on the front side. Figure 4As shown, the existing IBC cell body 10 has electrodes arranged on the back, and the front 10a of the existing IBC cell has no main grid line, which can effectively reduce the optical loss caused by grid line shading and has better aesthetics. Figure 4 a is the front view, Figure 4 b is a rear view, the existing IBC battery cell body 10 is easier to connect in series than the traditional battery cell 7, as shown in FIG. Figure 5 As shown, Figure 5 a is the rear view, Figure 5 b is a side view, in which the interconnection strip 8 is directly connected in series on the back of the battery cell, both the positive and negative electrodes are completed on the back of the battery cell. The interconnection strip 8 is first welded to the negative electrode main grid line 10b of the first battery cell, leading the negative electrode forward, and then another interconnection strip 8 is welded on the positive electrode main grid line 10c on the rear side of the first battery cell to extend to the negative electrode main grid line 10b of the second battery cell. The above actions are repeated to complete the IBC battery string B.

[0006] If the battery string B is connected in series according to its positive and negative poles, Figure 6 As shown, four battery strings B are connected in series with five bus bars 6 to form a photovoltaic module loop; but like traditional battery cell modules, they are still shielded by hot spots or shadows, so bypass diodes 9a and bypass diode loops 9b are generally added to reduce the shielding loss caused by hot spots or shadows.

[0007] However, in the process of making battery strings, the existing IBC cell technology, although the electrodes are moved to the back, still needs to be welded into strings one by one, and then the battery strings are arranged and then the busbars are welded. The difference is not much from the production of traditional cells, and the improvement of production efficiency is not significant. At the same time, the existing IBC battery assembly has no improvement in hot spots and power loss caused by shielding compared to traditional cells. Summary of the invention

[0008] The object of the present invention is to provide an IBC cell, a component and a production method thereof to solve the problems raised in the above background technology.

[0009] According to a first aspect of one or more embodiments of the present invention, an IBC cell body, a positive electrode and a negative electrode disposed on a backlight surface of the IBC cell body are provided;

[0010] The IBC cell body includes a first cell section, a rectangular transition zone, and a second cell section. The first cell section and the second cell section are distributed on both sides of the rectangular transition zone and form a mirror symmetry with the rectangular transition zone as the symmetry axis. The length of the rectangular transition zone along the lateral direction is a first preset distance 2d. The positive electrode and the negative electrode are arranged on the backlight surface of the first cell section and the second cell section, and the positive electrode and the negative electrode have main grid lines respectively; wherein the first preset distance 2d is twice the spacing between the positive electrode main grid line and the adjacent negative electrode main grid line.

[0011] According to a second aspect of one or more embodiments of the present application, there is provided an IBC cell assembly having the IBC cell as described in the first aspect, wherein the IBC cell assembly alternately arranges first battery row units and second battery row units along the longitudinal direction, the first battery row units include N IBC cell bodies arranged along the transverse direction, N is a positive integer greater than 2, the second battery row units include N-1 IBC cell bodies arranged along the transverse direction and rotated by 180°, and first cell sections and second cell sections rotated by 180° respectively arranged on both end sides of the N-1 IBC cell bodies; the distance along the transverse direction between the IBC cell bodies and the first cell section or the second cell section is the second preset distance d, and the distance along the transverse direction between the IBC cell bodies is the first preset distance 2d.

[0012] According to a third aspect of one or more embodiments of the present application, there is provided an IBC cell assembly having an IBC cell as described in the first aspect, wherein the IBC cell assembly comprises an IBC cell array, wherein the IBC cell array comprises a first cell row unit and a second cell row unit, wherein the first cell row units and the second cell row units are alternately arranged along the longitudinal direction, wherein the first cell row unit comprises N IBC cell bodies arranged along the transverse direction and a first cell section or a second cell section arranged on one of the two end sides of the N IBC cell bodies, wherein N is a positive integer greater than 2; wherein the second cell row unit comprises N IBC cell bodies arranged along the transverse direction after being rotated 180° and a first cell section or a second cell section arranged on the other of the two end sides of the N IBC cell bodies; wherein the distance along the transverse direction between the IBC cell bodies and the first cell section or the second cell section is a second preset distance d, and the distance along the transverse direction between the IBC cell bodies is a first preset distance 2d.

[0013] Preferably, the positive electrode includes a first positive electrode subdivision arranged in the first battery row unit, and a second positive electrode subdivision arranged in the second battery row unit adjacent to the first battery row unit; the negative electrode includes a first negative electrode subdivision in the first battery row unit, and a second negative electrode subdivision arranged in the second battery row unit adjacent to the first battery row unit;

[0014] The first positive electrode subdivision includes a plurality of first positive electrode connection points for connecting with welding wires, and a first positive electrode main grid line connecting adjacent first positive electrode connection points, and the first negative electrode subdivision includes a plurality of first negative electrode connection points for connecting with welding wires, and a first negative electrode main grid line connecting adjacent first negative electrode connection points;

[0015] The second positive electrode subdivision includes a plurality of second positive electrode connection points for connecting with the welding wire, and a second positive electrode main grid line connecting adjacent second positive electrode connection points, and the second negative electrode subdivision includes a plurality of second negative electrode connection points for connecting with the welding wire, and a second negative electrode main grid line connecting adjacent second negative electrode connection points;

[0016] The extension directions of the first positive electrode busbar line and the second negative electrode busbar line coincide with each other, and the extension directions of the first negative electrode busbar line and the second positive electrode busbar line coincide with each other.

[0017] Preferably, the IBC cell assembly further comprises bus bars arranged at upper and lower ends of the IBC cell array along the transverse direction.

[0018] Preferably, the IBC battery cell assembly is formed by rolling-welding a carrier film with welding wires to weld the bus bar to the first battery row unit and the second battery row unit to form a loop.

[0019] Preferably, the welding wire in the carrier film 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.

[0020] Preferably, the welding wire in the carrier film 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, and the welding wire causing the short circuit is removed by laser.

[0021] According to a fourth aspect of one or more embodiments of the present application, there is provided a method for producing an IBC cell assembly having the IBC cell according to the first aspect, the production method comprising:

[0022] Step S1, symmetrically dividing the original IBC cell into a first cell section and a second cell section along the longitudinal center line, the first cell section and the second cell section are respectively moved to both sides by a distance d, so that the first cell section and the second cell section are spaced apart in the transverse direction by a first preset distance 2d and are connected in series to form an IBC cell body, wherein the first preset distance 2d is twice the distance between the positive electrode main grid line and the adjacent negative electrode main grid line;

[0023] Step S2, arranging N IBC battery cell bodies in the transverse direction to form a first battery row unit, where N is a positive integer greater than 2; arranging N-1 IBC battery cell bodies rotated by 180° and the first battery cell division and the second battery cell division respectively arranged at both ends of the N-1 IBC battery cell bodies in the transverse direction to form a second battery row unit; arranging the first battery row unit and the second battery row unit alternately in the longitudinal direction to form an IBC battery cell array; the distance between the IBC battery cell body and the first battery cell division or the second battery cell division in the transverse direction is the second preset distance d, and the distance between the IBC battery cell bodies in the transverse direction is the first preset distance 2d;

[0024] Step S3, placing bus bars at the upper and lower ends of the IBC battery array respectively;

[0025] Step S4: placing a carrier film with welding wire on the IBC battery cell array, and welding and fixing the welding wire and the carrier film on the electrodes of the battery cells and attaching them to the back of the battery cells by rolling welding.

[0026] According to a fifth aspect of one or more embodiments of the present application, there is provided a method for producing an IBC cell assembly having the IBC cell according to the first aspect, the method comprising:

[0027] Step S1, symmetrically dividing the original IBC cell into a first cell section and a second cell section along the longitudinal center line, the first cell section and the second cell section are respectively moved to both sides by a distance d, so that the first cell section and the second cell section are spaced apart in the transverse direction by a first preset distance 2d and are connected in series to form an IBC cell body, wherein the first preset distance 2d is twice the distance between the positive electrode main grid line and the adjacent negative electrode main grid line;

[0028] Step S2, arranging N IBC battery cell bodies and the first battery cell division or the second battery cell division arranged on one side of the two end sides of the N IBC battery cell bodies in the transverse direction to form a first battery row unit, N is a positive integer greater than 2; arranging the N IBC battery cell bodies rotated by 180° and the first battery cell division or the second battery cell division arranged on the other side of the two end sides of the N IBC battery cell bodies in the transverse direction to form a second battery row unit; arranging the first battery row unit and the second battery row unit alternately in the longitudinal direction to form an IBC battery cell array; the distance between the IBC battery cell body and the first battery cell division or the second battery cell division in the transverse direction is the second preset distance d, and the distance between the IBC battery cell bodies in the transverse direction is the first preset distance 2d;

[0029] Step S3, placing bus bars at the upper and lower ends of the IBC battery array respectively;

[0030] Step S4: placing a carrier film with welding wire on the IBC battery cell array, and welding and fixing the welding wire and the carrier film on the electrodes of the battery cells and attaching them to the back of the battery cells by rolling welding.

[0031] Preferably, in step S4, the welding wire causing the short circuit is removed by laser.

[0032] Preferably, in step S4, the IBC battery cell array is transported to a heated transport platform of a foam hot pressing roller.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The IBC cell proposed in the present invention can divide the traditional cell into two and then weld them in series. The open circuit voltage of each half cell remains unchanged, and the current becomes 1 / 2 of the original. According to Joule's law, the internal loss of the half cell is reduced to 1 / 4 of the original, thereby improving the overall output power and efficiency of the component.

[0035] The present invention can directly weld the battery cells of an entire assembly through the carrier film to complete the circuit of the entire assembly without welding the battery cells one by one, thus greatly improving the efficiency.

[0036] The IBC cell assembly of the present invention is a staggered matrix layout, which can effectively reduce hot spots and power losses caused by shading of the cell, and does not require additional bypass diodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0038] Figure 1 The front view and rear view of the existing traditional battery cell;

[0039] Figure 2 The rear view and side view of the existing traditional battery cells welded into strings;

[0040] Figure 3 A schematic diagram of the structure of a photovoltaic module composed of existing traditional solar cells;

[0041] Figure 4 The front view and rear view of the existing IBC battery cell;

[0042] Figure 5 The rear view and side view of the existing IBC battery cells welded into strings;

[0043] Figure 6 It is a schematic diagram of the structure of a photovoltaic module composed of existing IBC cells;

[0044] Figure 7 A schematic diagram of the structure of an IBC cell according to an exemplary embodiment of the present invention;

[0045] Figure 8 A rear view of an IBC cell assembly shown as an exemplary embodiment of the present invention;

[0046] Fig. 9 A rear view of an IBC cell assembly according to another exemplary embodiment of the present invention;

[0047] Fig.10 A schematic structural diagram of a carrier film with welding wire according to an exemplary embodiment of the present invention;

[0048] Fig.11 This is a schematic diagram of a laser cutting off part of the welding wire according to an exemplary embodiment of the present invention;

[0049] Fig.12 A schematic diagram of laser cutting off a portion of a welding wire according to another exemplary embodiment of the present invention;

[0050] Fig.13 A front view of an IBC cell sheet assembly is shown as another exemplary embodiment of the present invention;

[0051] Fig.14A flow chart of a method for producing an IBC cell module according to an exemplary embodiment of the present invention;

[0052] Fig.15 A flow chart of a method for producing an IBC battery cell assembly is shown as another exemplary embodiment of the present invention.

[0053] In the figure: 1-IBC battery cell body, 2-first battery cell division, 3-second battery cell division, 4-IBC battery cell array, 5-carrier film, 5a-welding wire, 6-bus bar, 7-traditional battery cell, 7a-traditional battery cell positive electrode main grid, 7b-traditional battery cell negative electrode main grid, 8-interconnection strip welding ribbon, 9a-bypass diode, 9b-bypass diode loop, 10-existing IBC battery cell body, 10a-existing IBC battery cell front, 10b-existing IBC battery cell negative electrode main grid, 10c-existing IBC battery cell positive electrode main grid, 12-first battery cell, 13-second battery cell, 14-third battery cell. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0057] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0058] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0059] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0060] See also Figures 1 to 15 ,in Figures 1 to 6 For existing technology, Figures 7 to 15 The technical solution provided by the present invention is:

[0061] like Figure 7 As shown, the present invention provides an IBC battery sheet, comprising:

[0062] An IBC cell body 1, a positive electrode and a negative electrode arranged on the backlight surface of the IBC cell body 1;

[0063] The IBC cell body 1 includes a first cell section 2, a rectangular transition zone, and a second cell section 3. The first cell section 2 and the second cell section 3 are distributed on both sides of the rectangular transition zone and form mirror symmetry with the rectangular transition zone as the symmetry axis. The length of the rectangular transition zone along the lateral direction is a first preset distance 2d. The positive electrode and the negative electrode are arranged on the backlight surface of the first cell section 2 and the second cell section 3. The positive electrode and the negative electrode respectively have main grid lines; wherein the first preset distance 2d is twice the spacing between the positive electrode main grid line and the adjacent negative electrode main grid line.

[0064] In another specific embodiment, the IBC cell body 1 described in this application can be directly designed and produced.

[0065] The present invention also provides an IBC battery cell assembly, the IBC battery cell assembly includes an IBC battery cell array 4, the IBC battery cell array 4 includes a first battery row unit and a second battery row unit, the first battery row unit and the second battery row unit are alternately arranged in the longitudinal direction, the first battery row unit includes N IBC battery cell bodies 1 arranged in the transverse direction, N is a positive integer greater than 2, the second battery row unit includes N-1 IBC battery cell bodies 1 arranged in the transverse direction and rotated by 180°, and the first battery cell division 2 and the second battery cell division 3 are respectively arranged on both end sides of the N-1 IBC battery cell bodies 1 and rotated by 180°;

[0066] The distance between the IBC battery cell body 1 and the first battery cell section 2 or the second battery cell section 3 along the lateral direction is the second preset distance d, and the distance between the IBC battery cell bodies 1 along the lateral direction is the first preset distance 2d.

[0067] like Figure 8 As shown, the IBC battery cell body 1 and the first battery cell division 2 or the second battery cell division 3 are alternately arranged to form a first column. It should be noted that the first battery row unit can be an odd-numbered row of batteries in the figure, or Figure 8 The present invention does not impose any limitation on the even-numbered rows of batteries.

[0068] In a specific embodiment, the number and arrangement of the IBC cell bodies 1 can be adjusted until the desired IBC cell assembly voltage and current are achieved, such as Figure 8 As shown in , increasing the number of cells M in a column can increase the current of the IBC cell assembly, while increasing the number of columns N can increase the voltage of the IBC cell assembly.

[0069] In another embodiment, the present invention also provides an IBC battery cell assembly, such as Fig. 9 As shown in , the IBC battery cell assembly includes an IBC battery cell array 4, the IBC battery cell array 4 includes a first battery row unit and a second battery row unit, the first battery row unit and the second battery row unit are alternately arranged along the longitudinal direction, the first battery row unit includes N IBC battery cell bodies 1 arranged along the transverse direction and a first battery cell division 2 or a second battery cell division 3 arranged on one side of the two end sides of the N IBC battery cell bodies 1, N is a positive integer greater than 2; the second battery row unit includes N IBC battery cell bodies 1 rotated 180° and arranged along the transverse direction, and a first battery cell division 2 or a second battery cell division 3 arranged on the other side of the two end sides of the N IBC battery cell bodies 1;

[0070] The distance between the IBC battery cell body 1 and the first battery cell section 2 or the second battery cell section 3 along the lateral direction is the second preset distance d, and the distance between the IBC battery cell bodies 1 along the lateral direction is the first preset distance 2d.

[0071] In one embodiment, the IBC cell assembly includes a positive electrode and a negative electrode disposed on the backlight surface of the IBC cell body 1, the first cell section 2, and the second cell section 3;

[0072] The positive electrode includes a first positive electrode subdivision disposed in the first battery row cell, and a second positive electrode subdivision disposed in the second battery row cell adjacent to the first battery row cell; the negative electrode includes a first negative electrode subdivision disposed in the first battery row cell, and a second negative electrode subdivision disposed in the second battery row cell adjacent to the first battery row cell;

[0073] The first positive electrode subdivision includes a plurality of first positive electrode connection points for connecting with welding wires, and a first positive electrode main grid line connecting adjacent first positive electrode connection points, and the first negative electrode subdivision includes a plurality of first negative electrode connection points for connecting with welding wires, and a first negative electrode main grid line connecting adjacent first negative electrode connection points;

[0074] The second positive electrode subdivision includes a plurality of second positive electrode connection points for connecting with the welding wire, and a second positive electrode main grid line connecting adjacent second positive electrode connection points, and the second negative electrode subdivision includes a plurality of second negative electrode connection points for connecting with the welding wire, and a second negative electrode main grid line connecting adjacent second negative electrode connection points;

[0075] The extension directions of the first positive electrode busbar line and the second negative electrode busbar line coincide with each other, and the extension directions of the first negative electrode busbar line and the second positive electrode busbar line coincide with each other.

[0076] In a specific embodiment, the IBC cell assembly further includes bus bars 6 arranged at the upper and lower ends of the IBC cell array 4 along the transverse direction.

[0077] In a specific embodiment, the IBC battery cell assembly is formed by rolling-welding the carrier film 5 with welding wire 5a, and welding the bus bar 6 to the first battery row unit and the second battery row unit to form a loop.

[0078] In a specific embodiment, 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.

[0079] In a specific embodiment, 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, and the welding wire 5a causing the short circuit is removed by laser.

[0080] After the arrangement of the battery cells is completed, the present invention can complete the circuit of a whole assembly by rolling and welding the carrier film 5, without welding the battery cells one by one, thus greatly improving the efficiency.

[0081] At the same time, the IBC cell assembly in the present invention is a staggered matrix layout, which can effectively reduce hot spots and power losses caused by shading of the cells. Fig.12 As shown, the short-circuited welding wire 5a is cut by laser to form a complete component circuit as shown in FIG. Fig.12 , incision position D.

[0082] By arranging the IBC cells in a staggered matrix according to the present invention, when some cells are shielded, Fig.13 As shown, when the first cell 12 is shaded, no additional bypass diode is needed, and the current can flow through the second cell 13 and the third cell 14, thereby effectively avoiding the occurrence of hot spots in the first cell 12. The power loss is only the power generation power of the shaded first cell 12. Figure 6The IBC components of the prior art avoid 50% component power loss under the same circumstances.

[0083] In one embodiment, the present invention further provides a method for producing an IBC cell assembly having an IBC cell as described in the above embodiment, such as Fig.14 As shown, the production method comprises:

[0084] Step S1, symmetrically dividing the original IBC cell into a first cell section 2 and a second cell section 3 along the longitudinal center line, the first cell section 2 and the second cell section 3 are respectively moved to both sides by a distance d, so that the first cell section 2 and the second cell section 3 are spaced apart in the transverse direction by a first preset distance 2d and are connected in series to form an IBC cell body 1, wherein the first preset distance 2d is twice the spacing between the positive electrode main grid line and the adjacent negative electrode main grid line;

[0085] Step S2, arranging N IBC battery cell bodies 1 in the transverse direction to form a first battery row unit, where N is a positive integer greater than 2; arranging N-1 IBC battery cell bodies 1 rotated by 180° and the first battery cell division 2 and the second battery cell division 3 respectively arranged at both ends of the N-1 IBC battery cell bodies 1 rotated by 180° in the transverse direction to form a second battery row unit; arranging the first battery row unit and the second battery row unit alternately in the longitudinal direction to form an IBC battery cell array; the distance between the IBC battery cell body 1 and the first battery cell division 2 or the second battery cell division 3 in the transverse direction is the second preset distance d, and the distance between the IBC battery cell bodies 1 in the transverse direction is the first preset distance 2d;

[0086] Step S3, placing bus bars 6 at the upper and lower ends of the IBC battery array 4 respectively;

[0087] Step S4, placing the carrier film 5 with the welding wire 5a on the IBC battery cell array 4, and welding the welding wire 5a and the carrier film 5 to the electrodes of the battery cell and attaching them to the back of the battery cell by rolling welding.

[0088] In one embodiment, the present invention further provides a method for producing an IBC cell assembly having an IBC cell as described in the above embodiment, such as Fig.15 As shown, the production method comprises:

[0089] Step S1, symmetrically dividing the original IBC cell into a first cell section 2 and a second cell section 3 along the longitudinal center line, the first cell section 2 and the second cell section 3 are respectively moved to both sides by a distance d, so that the first cell section 2 and the second cell section 3 are spaced apart in the transverse direction by a first preset distance 2d and are connected in series to form an IBC cell body 1, wherein the first preset distance 2d is twice the spacing between the positive electrode main grid line and the adjacent negative electrode main grid line;

[0090] Step S2, arranging N IBC battery cell bodies 1 and the first battery cell division 2 or the second battery cell division 3 arranged on one side of the two end sides of the N IBC battery cell bodies 1 in the transverse direction to form a first battery row unit, N is a positive integer greater than 2; arranging the N IBC battery cell bodies 1 rotated by 180° and the first battery cell division 2 or the second battery cell division 3 arranged on the other side of the two end sides of the N IBC battery cell bodies 1 in the transverse direction to form a second battery row unit; arranging the first battery row unit and the second battery row unit alternately in the longitudinal direction to form an IBC battery cell array; the distance between the IBC battery cell body 1 and the first battery cell division 2 or the second battery cell division 3 in the transverse direction is the second preset distance d, and the distance between the IBC battery cell bodies 1 in the transverse direction is the first preset distance 2d;

[0091] Step S3, placing bus bars 6 at the upper and lower ends of the IBC battery array 4 respectively;

[0092] Step S4, placing the carrier film 5 with the welding wire 5a on the IBC battery cell array 4, and welding the welding wire 5a and the carrier film 5 to the electrodes of the battery cell and attaching them to the back of the battery cell by rolling welding.

[0093] In a specific embodiment, in step S4, the welding wire 5a causing the short circuit is removed by laser.

[0094] In a specific embodiment, in step S4, the IBC battery cell array 4 is transported to a heated transport platform of a foam hot pressing roller.

[0095] The present invention, the undescribed parts are prior art.

[0096] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

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

2. An IBC cell assembly having the IBC cell according to claim 1, characterized in that: The IBC cell assembly comprises an IBC cell array (4), the IBC cell array (4) comprising a first cell row unit and a second cell row unit alternately arranged in a longitudinal direction, the first cell row unit comprising N IBC cell bodies (1) arranged in a transverse direction, N being a positive integer greater than 2, the second cell row unit comprising N-1 IBC cell bodies (1) arranged in the transverse direction and rotated by 180°, and a first cell section (2) and a second cell section (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 cell section (2) or the second cell section (3) along the lateral direction is the second preset distance d, and the distance between the IBC cell bodies (1) along the lateral direction is the first preset distance 2d.

3. An IBC cell assembly having the IBC cell according to claim 1, characterized in that: The IBC cell assembly comprises an IBC cell array (4), wherein the IBC cell array (4) comprises a first cell row unit and a second cell row unit alternately arranged in a longitudinal direction, wherein the first cell row unit comprises N IBC cell bodies (1) arranged in a transverse direction and a first cell section (2) or a second cell section (3) arranged on one side of two ends of the N IBC cell bodies (1), wherein N is a positive integer greater than 2; and the second cell row unit comprises N IBC cell bodies (1) arranged in a transverse direction rotated by 180° and a second cell section (3) or a first cell section (2) arranged on the other side of two ends of the N IBC cell bodies (1). The distance between the IBC cell body (1) and the first cell section (2) or the second cell section (3) along the lateral direction is the second preset distance d, and the distance between the IBC cell bodies (1) along the lateral direction is the 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 subdivision disposed in the first battery row cell, and a second positive electrode subdivision disposed in the second battery row cell adjacent to the first battery row cell; the negative electrode includes a first negative electrode subdivision disposed in the first battery row cell, and a second negative electrode subdivision disposed in the second battery row cell adjacent to the first battery row cell; The first positive electrode subdivision includes a plurality of first positive electrode connection points for connecting with welding wires, and a first positive electrode main grid line connecting adjacent first positive electrode connection points, and the first negative electrode subdivision includes a plurality of first negative electrode connection points for connecting with welding wires, and a first negative electrode main grid line connecting adjacent first negative electrode connection points; The second positive electrode subdivision includes a plurality of second positive electrode connection points for connecting with the welding wire, and a second positive electrode main grid line connecting adjacent second positive electrode connection points, and the second negative electrode subdivision includes a plurality of second negative electrode connection points for connecting 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 busbar line and the second negative electrode busbar line coincide with each other, and the extension directions of the first negative electrode busbar line and the second positive electrode busbar line coincide with each other.

5. The IBC cell assembly according to claim 4, characterized in that: The IBC cell sheet assembly further comprises bus bars (6) arranged at the upper and lower ends of the IBC cell sheet array (4) along the transverse direction.

6. The IBC cell assembly according to claim 5, characterized in that: The IBC battery sheet assembly is welded by rolling a carrier film (5) with a welding wire (5a), and the bus bar (6) is welded to the first battery row unit and the second battery row unit to form a loop.

7. The IBC cell assembly according to claim 6, characterized in that: 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.

8. The IBC cell assembly according to claim 6, characterized in that: 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 the welding wire (5a) causing the short circuit is removed by laser.

9. A method for producing an IBC cell assembly having the IBC cell according to claim 1, characterized in that: The production method comprises: Step S1, symmetrically dividing the original IBC cell into a first cell section (2) and a second cell section (3) along the longitudinal center line, the first cell section (2) and the second cell section (3) are respectively moved to both sides by a distance d, so that the first cell section (2) and the second cell section (3) are spaced apart in the transverse direction by a first preset distance 2d and are connected in series to form an IBC cell body (1), wherein the first preset distance 2d is twice the distance between a positive electrode main grid line and an adjacent negative electrode main grid line; Step S2, arranging N IBC battery cell bodies (1) in the transverse direction to form a first battery row unit, where N is a positive integer greater than 2; arranging N-1 IBC battery cell bodies (1) rotated by 180° and the first battery cell division (2) and the second battery cell division (3) respectively arranged at the two ends of the N-1 IBC battery cell bodies (1) rotated by 180° in the transverse direction to form a second battery row unit; arranging the first battery row unit and the second battery row unit alternately in the longitudinal direction to form an IBC battery cell array; the distance between the IBC battery cell body (1) and the first battery cell division (2) or the second battery cell division (3) in the transverse direction is the second preset distance d, and the distance between the IBC battery cell bodies (1) in the transverse direction is the first preset distance 2d; Step S3, placing bus bars (6) at the upper and lower ends of the IBC battery cell array (4) respectively; Step S4, placing the carrier film (5) with the welding wire (5a) on the IBC battery cell array (4), and welding the welding wire (5a) and the carrier film (5) to the electrodes of the battery cell and to the back of the battery cell by rolling welding.

10. A method for producing an IBC cell assembly having the IBC cell according to claim 1, characterized in that: The production method comprises: Step S1, symmetrically dividing the original IBC cell into a first cell section (2) and a second cell section (3) along the longitudinal center line, the first cell section (2) and the second cell section (3) are respectively moved to both sides by a distance d, so that the first cell section (2) and the second cell section (3) are spaced apart in the transverse direction by a first preset distance 2d and are connected in series to form an IBC cell body (1), wherein the first preset distance 2d is twice the distance between a positive electrode main grid line and an adjacent negative electrode main grid line; Step S2, arranging N IBC battery cell bodies (1) and the first battery cell division (2) or the second battery cell division (3) arranged on one side of the two end sides of the N IBC battery cell bodies (1) in the transverse direction to form a first battery row unit, N is a positive integer greater than 2; arranging the N IBC battery cell bodies (1) rotated by 180° and the first battery cell division (2) or the second battery cell division (3) arranged on the other side of the two end sides of the N IBC battery cell bodies (1) in the transverse direction to form a second battery row unit; arranging the first battery row unit and the second battery row unit alternately in the longitudinal direction to form an IBC battery cell array; the distance between the IBC battery cell body (1) and the first battery cell division (2) or the second battery cell division (3) in the transverse direction is the second preset distance d, and the distance between the IBC battery cell bodies (1) in the transverse direction is the first preset distance 2d; Step S3, placing bus bars (6) at the upper and lower ends of the IBC battery cell array (4) respectively; Step S4, placing the carrier film (5) with the welding wire (5a) on the IBC battery cell array (4), and welding the welding wire (5a) and the carrier film (5) to the electrodes of the battery cell and to the back of the battery cell by rolling welding.

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

12. The production method according to claim 11, characterized in that: In step S4, the IBC cell array (4) is transported to a heated transport platform of a foam hot pressing roller.

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