Manufacturing method of back contact battery and assembly suitable for broadband interconnection

Abstract

The invention discloses a manufacturing method of a back contact battery and assembly suitable for broadband interconnection, and relates to the field of battery assemblies. According to the manufacturing method of the back contact battery and assembly suitable for broadband interconnection, a back plate main body, a conductive band, a battery piece and a front plate main body are included, and the outer side of the back plate main body is provided with a back package; the conductive band is selectively arranged on the back package; the battery pieces are selectively arranged on the conductive bands; a front package is arranged on the outer side of the front plate body. According to the manufacturing method of the back contact battery and assembly suitable for broadband interconnection, a multi-layer main grid and insulating layer structure is arranged, a structure comprising a positive electrode main grid, a negative electrode main grid, a positive electrode auxiliary grid, a negative electrode auxiliary grid, auxiliary grid insulating paste, a conductive paste layer and insulating paste is formed, and current transmission is carried out in the longitudinal direction of an electrode. And meanwhile, the main grid direction is different from the confluence direction of the battery pieces at the assembly end, so that the collection performance of the main grid is kept unchanged, and the problem that the width of the interconnection strip is limited is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery components, and in particular to a method for manufacturing a back-contact battery and component suitable for broadband interconnection. Background Art

[0002] The widespread use of solar power generation technology not only reduces dependence on traditional energy, but also improves energy security. With the continuous advancement of technology, the cost of solar power generation has gradually decreased, making it the preferred energy solution for more and more countries and families.

[0003] However, the traditional back-contact solar cell structure has some limitations in design. In order to ensure effective current collection, the spacing between the main grid and the auxiliary grid is usually designed to be narrow, which not only increases the consumption of grid line paste, but also limits the width of the available welding ribbon at the component end. To this end, in order to ensure effective current convergence, the welding ribbon needs to reach a certain thickness, which leads to stress concentration between the welding ribbon and the edge of the cell, thus affecting the reliability of the component. In addition, when the cells are connected in series through the welding process, they need to go through a high temperature process. The effect of thermal stress may cause the cell to warp, which not only seriously affects the production yield, but also poses a threat to the long-term stability of the component; At the same time, in the traditional battery assembly process, the interconnection of battery cells is mainly achieved by welding the welding ribbon on the main grid of the battery, so the direction of the main grid is the direction of the battery convergence. However, this design has many limitations. On the one hand, in order to reduce costs, the amount of main grid needs to be minimized, which leads to limited width of the welding ribbon. The resistance of the welding ribbon itself is affected by the cross-sectional area. In order to reduce the resistance of the welding ribbon, the thickness of the welding ribbon needs to be increased. However, the increase in the thickness of the welding ribbon will lead to an increase in welding stress, thereby increasing the risk of hidden cracks in the battery. On the other hand, the direction of the main grid is the same as the convergence direction, which greatly limits the design freedom of the component current. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method for manufacturing a back-contact cell and a module suitable for broadband interconnection, which solves the problem that the spacing between the main grid and the auxiliary grid of the traditional back-contact solar cell structure is usually designed to be narrow, which not only increases the consumption of grid line paste, but also limits the width of the available welding strip at the module end, thereby affecting the reliability of the module.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A back contact battery suitable for broadband interconnection, comprising: A back plate body, the outer side of which is provided with a back side package; A conductive tape, which may be optionally disposed on the backside package; A battery cell, which can be selectively arranged on a conductive tape, with conductive glue arranged between the battery cell and the conductive tape; A front panel body, the outer side of which is provided with a front package, and the front package is connected to the battery cell; The battery cell comprises: Blue diaphragm; A positive main grid is arranged on the blue film, and positive sub-grids are arranged on both sides of the positive main grid; A negative electrode main grid is arranged on the blue film sheet, and negative electrode sub-grids are arranged on both sides of the negative electrode main grid; Auxiliary grid insulating glue, which is arranged on the outside of the positive electrode auxiliary grid and the negative electrode auxiliary grid; A conductive paste layer is arranged on the other side of the positive electrode main grid and the negative electrode main grid, and an insulating glue is arranged on the outer side of the conductive paste layer; The directions of the positive electrode main grid and the negative electrode main grid are different from the convergence direction of the battery cells at the component end.

[0006] Preferably, a plurality of the negative electrode main grids and a plurality of the positive electrode main grids can be selectively arranged on the blue film.

[0007] A method for manufacturing a back-contact battery assembly suitable for broadband interconnection, the method comprising the following steps: Step 1: Laying the backplane body and the back side packaging: Laying the packaging material on the backplane body so that the outer side forms the back side packaging; Step 2: Conductive tape patching: using a patch machine, the conductive tape and the bus tape are sequentially laid on the back package according to the design pattern to obtain a conductive composite material; Step 3: Printing the conductive adhesive, using printing or glue dripping to print the conductive adhesive on the conductive composite material of a specific pattern at one time; Step 4: Insulation glue printing: Insulation glue is printed on the battery cell to separate the positive electrode main grid and the negative electrode main grid so that they can be interconnected using a conductive tape; Step 5: Battery cell patching: Use a robot to lay the battery cells in the designated positions of the conductive composite material in sequence; Step 6: front packaging and front panel main body laying, laying the front packaging and front panel main body in sequence to form a stack; Step seven, lamination, the laminated materials are baked and heated by infrared or baking lamps, the conductive adhesive is partially cured after being heated, and the battery cells and the conductive tapes are pre-bonded before lamination.

[0008] Preferably, the conductive tape has a width of 0.5-30 mm and a thickness of 35 μm-1000 μm.

[0009] Preferably, the conductive tape material can be but is not limited to copper, aluminum, silver, gold, nickel, tungsten or alloys of two or more thereof.

[0010] Preferably, the conductive tape is pre-fixed on the back package by ironing and baking.

[0011] Preferably, the back panel body can be made of glass or a transparent plate, and the back packaging can be made of EVA, EPE, POE, PVB and inorganic silica gel materials.

[0012] Preferably, the method for manufacturing the battery cell comprises the following steps: Step 1: Preparation of blue film; Step 2: Busbar printing: printing busbar slurry on the prepared blue film to form positive busbar and negative busbar, with the slurry height ranging from 1 μm to 100 μm; Step 3: Printing the positive electrode sub-grid, printing the positive electrode sub-grid slurry on the silicon wafer with the positive electrode main grid printed, with the slurry height of 1 μm ~100 μm; Step 4: negative electrode secondary grid printing: printing negative electrode secondary grid slurry on the silicon wafer with negative electrode main grid printed, with the slurry height of 1 μm ~100 μm; Step 5: Printing of auxiliary grid insulation glue: Print auxiliary grid insulation glue on the positive and negative auxiliary grids, and do not print on the main grid. Leave a blank width of 0.2mm~1mm, and the insulation glue width is 0.2mm~0.6mm; Step 6: Curing the auxiliary grid insulation glue; Step 7: Print two main grids to form a conductive paste layer, and print two main grid pastes in the blank space of the auxiliary grid insulation glue to form a conductive paste layer, with a printing height of 20 μm to 100 μm and a printing width of 1 mm to 20 mm; Step 8: Curing the conductive paste layer main grid.

[0013] Preferably, the main grid paste can be silver paste, aluminum paste, tin paste, copper paste, gold paste or one or more alloy pastes thereof, and the main grid shape can be continuous or discontinuous.

[0014] Preferably, the sub-grid paste can be silver paste, aluminum paste, tin paste, copper paste, gold paste or one or more alloy pastes thereof, and the positive sub-grid and the negative sub-grid can be printed at the same time.

[0015] The present invention discloses a method for manufacturing a back-contact battery and a component suitable for broadband interconnection, which has the following beneficial effects: The method for manufacturing a back-contact cell and assembly suitable for broadband interconnection is provided with a multi-layer main grid and insulating layer structure, forming a structure of a positive main grid, a negative main grid, a positive sub-grid, a negative sub-grid, a sub-grid insulating glue, a conductive paste layer and an insulating glue, and is designed to transmit current in the longitudinal direction of the electrode. At the same time, the main grid direction is different from the direction of the current convergence of the battery cell at the assembly end, and the problem of limited interconnection strip width is solved while maintaining the main grid collection performance unchanged or even better.

[0016] The method for manufacturing back-contact cells and modules suitable for broadband interconnection can use low-priced slurries to replace precious metal slurries while maintaining product performance, thereby reducing overall costs; after the main grid width is increased, the interconnection accuracy requirements at the module end are reduced, the process window is greatly increased, and the production line yield can be improved; product reliability is improved: the product as a whole has a two-dimensional packaging structure, and through a low-temperature packaging process, the process temperature of the entire packaging process does not exceed 150°C, so that there is no thermal stress between the conductive tape and the battery cell, further reducing the risk of desoldering and hidden cracks, and the product reliability is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the structure of the battery assembly of the present invention; Figure 2 It is a schematic diagram of the structure of the battery cell of the present invention; Figure 3 It is a schematic diagram of the stacking position of the battery cell and the conductive tape patch of the present invention; Figure 4 This is a schematic diagram of the positive and negative electrode auxiliary grid patterns of the present invention; Figure 5 This is a schematic diagram of the positive and negative main grid patterns of the present invention; Figure 6 This is a schematic diagram of the positive and negative electrode sub-grid insulating glue pattern of the present invention; Figure 7 It is a schematic diagram of a two-layer main grid conductive paste layer of the present invention; Figure 8 It is a schematic diagram of the insulating glue pattern of the two main grid conductive paste layers of the present invention; Fig. 9 A diagram showing the steps of a method for manufacturing a component in an embodiment of the present invention; Fig.10 1 is a step diagram of a method for manufacturing a battery cell in an embodiment of the present invention.

[0019] In the figure: 1. Back panel body; 2. Back packaging; 3. Conductive tape; 4. Conductive glue; 5. Battery cell; 51. Blue film; 52. Positive main grid; 53. Negative main grid; 54. Positive sub-grid; 55. Negative sub-grid; 56. Sub-grid insulating glue; 57. Conductive slurry layer; 58. Insulating glue; 6. Front packaging; 7. Front panel body. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. 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.

[0021] The embodiment of the present application solves the problem that the spacing between the main grid and the auxiliary grid of the traditional back-contact solar cell structure is usually designed to be narrow, which not only increases the consumption of grid line slurry, but also limits the width of the available welding strip at the component end. And then affects the reliability of the component. A multi-layer main grid and insulating layer structure is provided to form a structure of a positive main grid 52, a negative main grid 53, a positive auxiliary grid 54, a negative auxiliary grid 55, an auxiliary grid insulating glue 56, a conductive slurry layer 57 and an insulating glue 58, which is designed to transmit current in the longitudinal direction of the electrode. At the same time, the main grid direction is different from the convergence direction of the battery cell 5 at the component end, which solves the problem of limited width of the interconnection strip while keeping the main grid collection performance unchanged or even better.

[0022] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The embodiment of the present invention discloses a method for manufacturing a back-contact battery and a component suitable for broadband interconnection.

[0024] According to the attached Figure 1-8 As shown, including: A back panel body 1, with a back packaging 2 disposed on its outer side; A conductive tape 3, which can be selectively arranged on the back package 2; A battery cell 5, which can be selectively arranged on the conductive tape 3, with a conductive adhesive 4 arranged between the battery cell 5 and the conductive tape 3; A front plate body 7, on the outer side of which a front package 6 is provided, and the front package 6 is connected to the battery cell 5; The battery cell 5 includes: Blue diaphragm 51; A positive electrode main grid 52 is arranged on the blue film 51, and positive electrode sub-grids 54 are arranged on both sides of the positive electrode main grid 52; A negative electrode main grid 53 is arranged on the blue film 51, and negative electrode sub-grids 55 are arranged on both sides of the negative electrode main grid 53; A sub-grid insulating glue 56, which is arranged on the outer sides of the positive sub-grid 54 and the negative sub-grid 55; A conductive paste layer 57 is disposed on the other side of the positive electrode main grid 52 and the negative electrode main grid 53, and an insulating glue 58 is disposed on the outer side of the conductive paste layer 57; The directions of the positive electrode main grid 52 and the negative electrode main grid 53 are different from the convergence direction of the battery cell 5 at the component end.

[0025] Furthermore, a plurality of negative electrode main grids 53 and a plurality of positive electrode main grids 52 may be selectively disposed on the blue film 51. .

[0026] A multi-layer main grid and insulating layer structure is provided to form a structure of a positive main grid 52, a negative main grid 53, a positive sub-grid 54, a negative sub-grid 55, a sub-grid insulating glue 56, a conductive paste layer 57 and an insulating glue 58, and is designed to transmit current in the longitudinal direction of the electrode. At the same time, the main grid direction is different from the direction of the current collection of the battery cell 5 at the component end, which solves the problem of limited width of the interconnection bar while maintaining the collection performance of the main grid unchanged or even better.

[0027] A method for manufacturing a back-contact battery assembly suitable for broadband interconnection, the assembly manufacturing method comprising the following steps: Step 1: Laying the backplane body 1 and the back side package 2, laying the package material on the backplane body 1 so that the outer side forms the back side package 2; Step 2: Using a chip mounter, the conductive tape 3 and the bus tape are sequentially laid on the back package 2 according to the design pattern to obtain a conductive composite material; Step 3: Printing the conductive adhesive 4: Printing the conductive adhesive 4 on the conductive composite material of a specific pattern at one time by printing or dripping glue; Step 4: Printing the insulating glue 58: Printing the insulating glue 58 on the battery cell 5 to separate the positive electrode main grid 52 and the negative electrode main grid 53 so that they can be interconnected using the conductive tape 3; Step 5: Attaching the battery cell 5, using a robot to sequentially lay the battery cell 5 at designated positions of the conductive composite material; Step 6: Laying the front package 6 and the front plate body 7, laying the front package 6 and the front plate body 7 in sequence to form a stack; Step seven, lamination, the laminated materials are baked and heated by infrared or baking lamp, the conductive adhesive 4 is partially cured after being heated, and the battery cell 5 and the conductive tape 3 are pre-bonded, and then lamination is performed.

[0028] Furthermore, the conductive tape 3 has a width of 0.5 to 30 mm and a thickness of 35 μm to 1000 μm.

[0029] Furthermore, the material of the conductive tape 3 can be, but is not limited to, copper, aluminum, silver, gold, nickel, tungsten or alloys of two or more thereof.

[0030] Furthermore, the conductive tape 3 is pre-fixed on the back package 2 by ironing and baking.

[0031] Furthermore, the back panel body 1 can be made of glass or a transparent plate, and the back packaging 2 can be made of EVA, EPE, POE, PVB and inorganic silica gel materials.

[0032] Specifically disclosed, the method for manufacturing the battery cell 5 comprises the following steps: Step 1: blue film preparation 51; Step 2: busbar printing: printing busbar slurry on the prepared blue film 51 to form a positive busbar 52 and a negative busbar 53, with the slurry height being 1 μm to 100 μm; Step 3: Printing the positive electrode sub-grid 54, printing the positive electrode sub-grid 54 slurry on the silicon wafer on which the positive electrode main grid 52 has been printed, with the slurry height of 1 μm to 100 μm; Step 4: Printing the negative electrode sub-grid 55, printing the negative electrode sub-grid 55 slurry on the silicon wafer on which the negative electrode main grid 53 has been printed, with the slurry height of 1 μm to 100 μm; Step 5: Printing of auxiliary grid insulating glue 56: Print auxiliary grid insulating glue 56 on positive auxiliary grid 54 and negative auxiliary grid 55, and do not print on the main grid position, leaving a blank width of 0.2mm~1mm, and the width of the insulating glue is 0.2mm~0.6mm; Step 6: The auxiliary grid insulating glue 56 is cured; Step 7: Print two main grids to form a conductive paste layer 57. Print two main grid pastes in the blank space of the auxiliary grid insulating glue 56 to form a conductive paste layer 57. The printing height is 20 μm-100 μm and the printing width is 1 mm-20 mm. Step eight: curing the conductive paste layer 57 main grid.

[0033] Furthermore, the main grid paste can be silver paste, aluminum paste, tin paste, copper paste, gold paste or one or more alloy pastes thereof, and the main grid shape can be continuous or discontinuous.

[0034] Specifically disclosed, the sub-grid paste can be silver paste, aluminum paste, tin paste, copper paste, gold paste, etc. or one or more alloy pastes thereof, and the positive sub-grid 54 and the negative sub-grid 55 can be printed at the same time.

[0035] Under the premise of maintaining product performance, low-priced slurry can be selected to replace the use of precious metal slurry, thereby reducing the overall cost; after the main grid width increases, the interconnection accuracy requirements at the component end are reduced, and the process window is greatly increased, which can improve the production line yield; improve product reliability: the overall product has a two-dimensional packaging structure, and through the low-temperature packaging process, there is no thermal stress between the conductive tape 3 and the battery cell 5, which further reduces the risk of desoldering and hidden cracks, and the product reliability is better.

[0036] Example: According to the attached Figure 9-10 As shown, the method for making the component includes the following steps: 1. Lay the back package 2 on the work surface. The packaging material is EVA, EPE, POE, PVB, and inorganic silica gel material; 2. Use a chip mounter to lay the conductive tape 3 and the busbar on the back package 2 in sequence according to the design pattern. The width of the conductive tape 3 is 0.5~30mm and the thickness is 35μm~1000μm. The material of the conductive tape 3 can be but not limited to copper, aluminum, silver, gold, nickel, tungsten or two or more alloys thereof. After ironing and baking, pre-fix the conductive tape 3 on the back package 2. Obtain a conductive composite material; 3. Lay the back panel body 1 on the assembly line carrier, and the back panel body 1 can be glass or a transparent front panel; 4. Laying the conductive composite material obtained in step 2 on the back plate body 1; 5. Printing conductive glue 4 on the conductive composite material of a specific pattern by printing or dripping, the conductive material can be but not limited to tin-bismuth alloy paste, polymer conductive paste, silver paste; 6. Print insulating glue 58 on the battery cell 5 to separate the positive and negative main grids so that they can be interconnected using the conductive tape 3 without short circuit. The insulating glue 58 has a width of 1mm~40mm and a height of 20μm~100μm; 7. Using a robot, lay the battery sheet 5 in sequence at the designated position of the conductive composite material; 8. Lay the front package 6 and the front plate body 7 to form a stack; 9. The laminated materials are heated by means of infrared or baking lamps, and the conductive adhesive 4 is partially cured after being heated, so that the battery cell 5 and the conductive tape 3 are pre-bonded. 10. Turn the stack over and laminate.

[0037] The method for manufacturing the battery cell 5 comprises the following steps: 1. Printing of positive sub-grid 54: Print the positive sub-grid 54 paste on the prepared blue film 51. The paste height is within 10μm. The paste can be silver paste, aluminum paste, tin paste, copper paste, gold paste or one or more alloy pastes. The grid line is continuously thinned and can be widened in different forms at the main grid position, such as wedge, square, trapezoid, and circle; 2. Negative sub-grid 55 printing: Print the negative sub-grid 55 paste on the silicon wafer with the positive sub-grid 54 printed on it. The paste height is within 10μm. The paste can be silver paste, aluminum paste, tin paste, copper paste, gold paste or one or more alloy pastes. The grid line is continuously thinned and can be widened in different forms at the main grid position, such as wedge, square, trapezoid, and circle; 3. Printing of auxiliary grid insulating glue 56: Printing insulating material on the positive and negative auxiliary grid silicon wafers with printed positive and negative electrodes, with a printing height of 20μm~100μm and a printing width of 0.2mm~0.6mm; the printed pattern is positive and negative alternating with blank spaces, with a blank width of 0.2mm~1mm; 4. Print two main grid pastes in the blank space of the auxiliary grid insulation glue 56 to form a conductive paste layer 57, with a printing height of 20μm-100μm and a printing width of 1mm-20mm. The paste can be silver paste, aluminum paste, tin paste, copper paste, gold paste or one or more alloy pastes above.

[0038] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A back contact battery suitable for broadband interconnection, characterized in that: include: A back plate body (1), the outer side of which is provided with a back side package (2); A conductive tape (3) which can be selectively arranged on the back side package (2); A battery cell (5) which can be selectively arranged on the conductive tape (3), wherein a conductive adhesive (4) is arranged between the battery cell (5) and the conductive tape (3); A front plate body (7) having a front package (6) disposed on its outer side, and the front package (6) is connected to the battery cell (5); The battery cell (5) comprises: Blue diaphragm (51); A positive electrode main grid (52) is arranged on the blue film (51), and positive electrode sub-grids (54) are arranged on both sides of the positive electrode main grid (52); A negative electrode main grid (53) is arranged on the blue film (51), and negative electrode sub-grids (55) are arranged on both sides of the negative electrode main grid (53); Auxiliary grid insulating glue (56) is arranged on the outer sides of the positive electrode auxiliary grid (54) and the negative electrode auxiliary grid (55); A conductive paste layer (57) is arranged on the other side of the positive electrode main grid (52) and the negative electrode main grid (53), and an insulating glue (58) is arranged on the outer side of the conductive paste layer (57); The directions of the positive electrode main grid (52) and the negative electrode main grid (53) are different from the convergence direction of the battery cell (5) at the component end.

2. A back contact battery suitable for broadband interconnection according to claim 1, characterized in that: A plurality of the negative electrode main grids (53) and a plurality of the positive electrode main grids (52) may be selectively arranged on the blue film (51).

3. A method for manufacturing a component of a back-contact battery suitable for broadband interconnection, used for preparing a back-contact battery suitable for broadband interconnection as claimed in any one of claims 1 to 2, characterized in that: The method for making the assembly comprises the following steps: Step 1: Laying the backplane body (1) and the back side package (2), laying the package material on the backplane body (1) so that the outer side forms the back side package (2); Step 2: Mounting the conductive tape (3) using a mounting machine to sequentially lay the conductive tape (3) and the bus tape on the back package (2) according to the design pattern to obtain a conductive composite material; Step 3: Printing the conductive adhesive (4), printing the conductive adhesive (4) on the conductive composite material of a specific pattern at one time by printing or dripping adhesive; Step 4: Printing insulating glue (58): Printing insulating glue (58) on the battery cell (5) to separate the positive electrode main grid (52) and the negative electrode main grid (53) so that they can be interconnected using the conductive tape (3); Step 5: Battery cell (5) patching: using a robot to sequentially lay the battery cell (5) at designated positions on the conductive composite material; Step 6: Laying the front package (6) and the front plate body (7), laying the front package (6) and the front plate body (7) in sequence to form a stack; Step seven, lamination, the laminated material is heated by means of infrared or baking lamp, the conductive adhesive (4) is partially cured after being heated, and the battery cell (5) and the conductive tape (3) are pre-bonded before lamination.

4. The method for manufacturing a back contact battery assembly suitable for broadband interconnection according to claim 3, characterized in that: The conductive tape (3) has a width of 0.5 to 30 mm and a thickness of 35 μm to 1000 μm.

5. The method for manufacturing a back contact battery assembly suitable for broadband interconnection according to claim 3, characterized in that: The conductive tape (3) may be made of, but is not limited to, copper, aluminum, silver, gold, nickel, tungsten or alloys of two or more thereof.

6. The method for manufacturing a back contact battery assembly suitable for broadband interconnection according to claim 3, characterized in that: The conductive tape (3) is pre-fixed on the back package (2) by means of ironing and baking.

7. The method for manufacturing a back contact battery assembly suitable for broadband interconnection according to claim 1, characterized in that: The back panel body (1) can be made of glass or a transparent plate, and the back packaging (2) can be made of EVA, EPE, POE, PVB or inorganic silica gel material.

8. The method for manufacturing a back contact battery assembly suitable for broadband interconnection according to claim 3, characterized in that: The method for manufacturing the battery cell (5) comprises the following steps: Step 1: Preparation of blue membrane (51); Step 2: busbar printing: printing busbar slurry on the prepared blue film (51) to form a positive busbar (52) and a negative busbar (53), with the slurry height being between 1 μm and 100 μm; Step 3: printing the positive electrode sub-grid (54), printing the positive electrode sub-grid (54) slurry on the silicon wafer on which the positive electrode main grid (52) has been printed, with the slurry height being 1 μm to 100 μm; Step 4: printing the negative electrode sub-grid (55), printing the negative electrode sub-grid (55) slurry on the silicon wafer on which the negative electrode main grid (53) has been printed, with the slurry height being 1 μm to 100 μm; Step 5: Printing the auxiliary grid insulating glue (56): Printing the auxiliary grid insulating glue (56) on the positive auxiliary grid (54) and the negative auxiliary grid (55), while not printing the main grid position, leaving a blank width of 0.2 mm to 1 mm, and the insulating glue width is 0.2 mm to 0.6 mm; Step 6: Insulation glue curing Step 7: Printing two main grid lines: Print two main grid lines of paste in the blank space of the auxiliary grid insulation glue (56), with a printing height of 20 μm to 100 μm and a printing width of 1 mm to 20 mm; Step 8: Main grid solidification.

9. The method for manufacturing a back contact battery assembly suitable for broadband interconnection according to claim 8, characterized in that: The main grid paste can be silver paste, aluminum paste, tin paste, copper paste, gold paste or one or more alloy pastes thereof.

10. The method for manufacturing a back contact battery assembly suitable for broadband interconnection according to claim 8, characterized in that: The sub-grid paste can be silver paste, aluminum paste, tin paste, copper paste, gold paste or one or more alloy pastes thereof, and the positive electrode sub-grid (54) and the negative electrode sub-grid (55) can be printed simultaneously.

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