Solar cell and photovoltaic module

Abstract

The utility model provides a kind of solar cell and photovoltaic module, solar cell includes cell base, multiple positive grid line electrodes, multiple negative grid line electrodes, positive conductive strip and negative conductive strip.Each positive grid line electrode includes multiple positive sub-electrodes extending along the same direction, two adjacent positive sub-electrodes are spaced apart by positive interval area, each negative grid line electrode includes multiple negative sub-electrodes extending along the same direction, two adjacent negative sub-electrodes are spaced apart by negative interval area.Positive conductive strip and the positive sub-electrode in multiple positive grid line electrodes intersect and electrically contact positive sub-electrode, negative conductive strip and the negative sub-electrode in multiple negative grid line electrodes intersect and electrically contact negative sub-electrode.Even if there is a problem of local shedding or false welding between grid line electrode and solder strip, the current in the solar cell can still be fully collected.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially relates to a solar cell and photovoltaic module. BACKGROUND

[0002] Back contact (BC) solar cell is a kind of solar cell, and the anode and cathode are arranged on the back light surface.Back contact solar cell can avoid the shading of electrode to light-receiving surface, increase the absorption of light by semiconductor material, and therefore has higher photoelectric conversion efficiency.Currently, conductive silver paste is usually used to prepare the electrode of solar cell, which leads to that the material cost of electrode accounts for a high proportion in the production cost of solar cell.Some conventional technologies propose to cancel the main grid electrode and pad, and directly stack and weld the solder strip on the fine grid electrode, so as to reduce the material cost of electrode.However, the fine grid electrode is usually narrow, and the local shedding or false welding problem is prone to occur between the solder strip and grid line electrode, which leads to that the current of solar cell is difficult to be fully collected. SUMMARY

[0003] Therefore, it is necessary to provide a solar cell capable of fully collecting current in view of the problems in the above background technology.

[0004] According to some embodiments of the utility model, a solar cell is provided, which includes a cell substrate, a plurality of positive grid line electrodes, a plurality of negative grid line electrodes, a positive conductive strip and a negative conductive strip.

[0005] The positive grid line electrodes and the negative grid line electrodes are arranged on the back light surface of the cell substrate, each of the positive grid line electrodes includes a plurality of positive sub-electrodes extending along the same direction, and the adjacent two positive sub-electrodes are spaced apart by a positive interval; each of the negative grid line electrodes includes a plurality of negative sub-electrodes extending along the same direction, and the adjacent two negative sub-electrodes are spaced apart by a negative interval.

[0006] The positive conductive strip intersects with the positive sub-electrodes in the plurality of positive grid line electrodes and is electrically connected to the positive sub-electrodes, and the positive conductive strip is arranged in the negative interval and is spaced apart from the negative sub-electrodes; the negative conductive strip intersects with the negative sub-electrodes in the plurality of negative grid line electrodes and is electrically connected to the negative sub-electrodes, and the negative conductive strip is arranged in the positive interval and is spaced apart from the positive sub-electrodes.

[0007] In some embodiments of the utility model, the plurality of positive grid line electrodes and the plurality of negative grid line electrodes extend along a first direction, and the positive conductive strip and the negative conductive strip extend along a second direction intersecting with the first direction.

[0008] In some embodiments of the utility model, the positive electrode interval area in multiple positive grid line electrodes is flush arranged in the second direction, the negative electrode conductive strip is arranged in multiple positive electrode interval areas flush arranged in the second direction;

[0009] The negative electrode interval area in multiple negative grid line electrodes is flush arranged in the second direction, the positive electrode conductive strip is arranged in multiple negative electrode interval areas flush arranged in the second direction.

[0010] In some embodiments of the utility model, the positive grid line electrode and the negative grid line electrode are alternately and spaced arranged, and / or,

[0011] The positive electrode conductive strip and the negative electrode conductive strip are alternately and spaced arranged.

[0012] In some embodiments of the utility model, the spacing between the positive grid line electrode and the negative grid line electrode adjacent thereto is 0.2mm-2mm, and / or,

[0013] The spacing between two adjacent positive electrode conductive strips is 10mm-30mm, and / or,

[0014] The spacing between two adjacent negative electrode conductive strips is 10mm-30mm.

[0015] In some embodiments of the utility model, the solar cell further includes a negative electrode insulator and a positive electrode insulator, the negative electrode insulator is arranged on the negative electrode interval area and shields the top wall and the side wall of the positive electrode conductive strip, and the positive electrode insulator is arranged on the positive electrode interval area and shields the top wall and the side wall of the negative electrode conductive strip.

[0016] In some embodiments of the utility model, the negative electrode insulator and the positive electrode insulator are both insulating glue, the negative electrode insulator is adhered on the battery base and the positive electrode conductive strip, and the positive electrode insulator is adhered on the battery base and the negative electrode conductive strip, and / or,

[0017] The positive electrode conductive strip and the negative electrode conductive strip are both conductive glue, the positive electrode conductive strip is adhered on the battery base and the positive grid line electrode, and the negative electrode conductive strip is adhered on the battery base and the negative grid line electrode.

[0018] Further, the utility model still provides a kind of photovoltaic module, it includes multiple positive electrode welding strip, multiple negative electrode welding strip and the solar cell as any one of the above embodiment described, multiple the positive electrode welding strip is welded on multiple the positive grid line electrode corresponding, the positive electrode welding strip and the positive electrode conductive strip electric contact and insulation between the negative electrode conductive strip;Multiple the negative electrode welding strip is welded on multiple the negative grid line electrode corresponding, the negative electrode welding strip and the negative electrode conductive strip electric contact and insulation between the positive electrode conductive strip.

[0019] In some embodiments of the utility model, the photovoltaic module further comprises a positive electrode conductive paste and a negative electrode conductive paste.

[0020] The positive electrode conductive paste is arranged on the overlapping area of the positive electrode welding strip and the positive electrode conductive strip, and the positive electrode conductive paste is adhered to the cell substrate and contacts the positive electrode welding strip and the positive electrode conductive strip.

[0021] The negative electrode conductive paste is arranged on the overlapping area of the negative electrode welding strip and the negative electrode conductive strip, and the negative electrode conductive paste is adhered to the cell substrate and contacts the negative electrode welding strip and the negative electrode conductive strip.

[0022] In some embodiments of the utility model, the photovoltaic module comprises a plurality of solar cells arranged side by side, and in the two adjacent solar cells, the positive electrode welding strip on one of the solar cells is connected to the negative electrode welding strip on the other solar cell.

[0023] In the solar cell of at least one embodiment, a plurality of positive grid line electrodes, a plurality of negative grid line electrodes, a positive electrode conductive strip and a negative electrode conductive strip are arranged on the back surface of the cell substrate. Among them, the positive electrode conductive strip intersects with the positive sub-electrode of the plurality of positive grid line electrodes to conduct the plurality of positive grid line electrodes and realize the circulation of current between the plurality of positive grid line electrodes. Even if there is a problem of local falling or false welding between a certain positive grid line electrode and a welding strip, the current can be transmitted to other positive grid line electrodes and welding strips through the positive electrode conductive strip. Similarly, the current can also be transmitted to the normally welded negative grid line electrode and welding strip through the negative electrode conductive strip. Therefore, even if there is a problem of local falling or false welding between the grid line electrode and the welding strip, the current in the solar cell can still be fully collected.

[0024] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the following preferred embodiments of the utility model are described in detail with the help of the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a top view structural schematic diagram of a solar cell.

[0026] Figure 2 A schematic view of a structure of a photovoltaic module.

[0027] Wherein, each reference sign and its meaning are as follows:

[0028] 100, cell substrate; 110, positive grid line electrode; 111, positive sub-electrode; 112, positive electrode interval; 120, negative grid line electrode; 121, negative sub-electrode; 122, negative electrode interval; 130, positive conductive strip; 140, negative conductive strip; 150, positive insulator; 160, negative insulator; 210, positive electrode solder strip; 220, negative electrode solder strip; 230, positive conductive adhesive; 240, negative conductive adhesive. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below in combination with embodiments and effect diagrams. The embodiments give the preferred embodiments of the present application. However, the present application can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly fixed to the other element or can be fixed to the other element through an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element between the two elements. In addition, in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", and "connection" should be understood in a broad sense, for example, it can be fixed connection, or it can be detachable connection, or it can be integrated connection. For example, it can be mechanical connection, or it can be electrical connection. For example, it can be direct connection, or it can be indirect connection through an intermediate element, or it can be internal communication of two elements. It should be understood that those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances, and there will be no ambiguity.

[0031] Unless otherwise limited, in the description of the present application, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and other terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present application, which is only for the purpose of facilitating and simplifying the description of the content of the present application, and to help the reader understand the drawings, and is not to limit or imply that the device or element referred to must have a specific orientation, therefore it cannot be understood as a limitation of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of "and / or" means any one or all possible combinations of one or more of the associated listed items. "Multiple" herein includes combinations of two or more items.

[0033] The utility model provides a kind of solar cell, it includes cell substrate, multiple positive grid line electrode, multiple negative grid line electrode, positive conductive strip and negative conductive strip. Positive grid line electrode and negative grid line electrode are all set on the back light surface of cell substrate, each positive grid line electrode includes multiple positive sub-electrode extending along the same direction, two adjacent positive sub-electrode is spaced apart by positive interval area, each negative grid line electrode includes multiple negative sub-electrode extending along the same direction, two adjacent negative sub-electrode is spaced apart by negative interval area. Positive conductive strip intersects with the positive sub-electrode in multiple positive grid line electrode and is electrically contacted with positive sub-electrode, and positive conductive strip is arranged in negative interval area and is spaced apart from negative sub-electrode;Negative conductive strip intersects with the negative sub-electrode in multiple negative grid line electrode and is electrically contacted with negative sub-electrode, and negative conductive strip is arranged in positive interval area and is spaced apart from positive sub-electrode.

[0034] In the solar cell of the utility model, multiple positive grid line electrodes, multiple negative grid line electrodes, positive conductive strip and negative conductive strip are arranged on the back light surface of cell substrate. Among them, positive conductive strip intersects with the positive sub-electrode of multiple positive grid line electrode to conduct multiple positive grid line electrode, to realize the flow of current between multiple positive grid line electrode. Even if the problem of local drop or false welding occurs between certain positive grid line electrode and solder strip, current can be transmitted to other positive grid line electrode and solder strip by positive conductive strip. Similarly, current can also be transmitted to normally welded negative grid line electrode and solder strip by negative conductive strip. Therefore, even if there is a problem of local drop or false welding between grid line electrode and solder strip, the current in the solar cell can still be fully collected.

[0035] Figure 1 It is a top view structural schematic diagram of a solar cell of the utility model. Refer to Figure 1As shown, the solar cell includes a cell substrate 100, a plurality of positive grid electrodes 110, a plurality of negative grid electrodes 120, a positive conductive strip 130 and a negative conductive strip 140. The positive grid electrodes 110 and the negative grid electrodes 120 are both disposed on the back surface of the cell substrate 100, each of the positive grid electrodes 110 includes a plurality of positive sub-electrodes 111 extending along the same direction, and two adjacent positive sub-electrodes 111 are spaced apart by a positive spacing region 112, and each of the negative grid electrodes 120 includes a plurality of negative sub-electrodes 121 extending along the same direction, and two adjacent negative sub-electrodes 121 are spaced apart by a negative spacing region 122.

[0036] Referring to Figure 1 As shown, in this embodiment, the positive conductive strip 130 intersects and electrically contacts the positive sub-electrodes 111 in the plurality of positive grid electrodes 110, and the positive conductive strip 130 is disposed in the negative spacing region 122 and spaced apart from the negative sub-electrodes 121. The negative conductive strip 140 intersects and electrically contacts the negative sub-electrodes 121 in the plurality of negative grid electrodes 120, and the negative conductive strip 140 is disposed in the positive spacing region 112 and spaced apart from the positive sub-electrodes 111.

[0037] As an example of this embodiment, the cell substrate 100 includes a silicon substrate, a P-type doped layer and an N-type doped layer, both of which are disposed on the back surface of the silicon substrate, and the P-type doped layer and the N-type doped layer are spaced apart. It can be understood that the positive grid electrodes 110 and the negative grid electrodes 120 are mainly determined by the conductive type of the doped layer contacted. For example, the positive grid electrodes 110 are disposed on the P-type doped layer and used to lead out the holes generated in the P-type doped layer, and the negative grid electrodes 120 are disposed on the N-type doped layer and used to lead out the electrons generated in the N-type doped layer.

[0038] Referring to Figure 1 As an example of this embodiment, as shown, the plurality of positive grid electrodes 110 and the plurality of negative grid electrodes 120 both extend along a first direction, and the positive conductive strip 130 and the negative conductive strip 140 both extend along a second direction intersecting the first direction. This structure design can make the positive grid electrodes 110, the negative grid electrodes 120, the positive conductive strip 130 and the negative conductive strip 140 more orderly and regular in arrangement, which is beneficial to improve the arrangement density of the electrodes and the conductive strips.

[0039] In some examples of this embodiment, the first direction and the second direction are perpendicular. In other examples, the first direction and the second direction can also be obliquely intersected.

[0040] Referring to Figure 1As shown, as an example of this embodiment, the positive electrode spacing regions 112 in the plurality of positive grid line electrodes 110 are arranged in flush in the second direction, and it can be understood that the plurality of positive electrode spacing regions 112 arranged in flush in the second direction can be a row of positive electrode spacing regions 112. The negative electrode conductive strip 140 is arranged in the row of positive electrode spacing regions 112, which enables the negative electrode conductive strip 140 to pass through the plurality of positive electrode spacing regions 112 in a flat shape, simplifying the structural design thereof.

[0041] Referring to Figure 1 As shown, as an example of this embodiment, the negative electrode spacing regions 122 in the plurality of negative grid line electrodes 120 are arranged in flush in the second direction, and it can be understood that the plurality of negative electrode spacing regions 122 arranged in flush in the second direction can be a row of negative electrode spacing regions 122. The positive electrode conductive strip 130 is arranged in the row of negative electrode spacing regions 122, which enables the negative electrode conductive strip 140 to pass through the plurality of positive electrode spacing regions 112 in a flat shape, simplifying the structural design thereof.

[0042] Referring to Figure 1 As shown, it can be understood that each positive grid line electrode 110 can include three or more positive sub-electrodes 111, at which time a plurality of positive electrode spacing regions 112 are arranged in each positive grid line electrode 110, and a plurality of rows of positive electrode spacing regions 112 are arranged in the plurality of positive grid line electrodes 110. Each negative grid line electrode 120 can include three or more negative sub-electrodes 121, at which time a plurality of negative electrode spacing regions 122 are arranged in each negative grid line electrode 120, and a plurality of rows of negative electrode spacing regions 122 are arranged in the plurality of negative grid line electrodes 120.

[0043] Referring to Figure 1 As shown, as an example of this embodiment, the positive grid line electrodes 110 and the negative grid line electrodes 120 are arranged alternately and spaced apart.

[0044] Referring to Figure 1 As shown, as an example of this embodiment, the positive electrode conductive strip 130 and the negative electrode conductive strip 140 are both a plurality of strips, and the positive electrode conductive strip 130 and the negative electrode conductive strip 140 are arranged alternately and spaced apart.

[0045] Referring to Figure 1 As shown, as an example of this embodiment, the spacing between the positive grid line electrodes 110 and the negative grid line electrodes 120 adjacent thereto is 0.2mm-2mm. This spacing is conducive to saving the amount of electrode material while extracting carriers sufficiently.

[0046] In some examples of this embodiment, the spacing between the positive gate electrode 110 and the adjacent negative gate electrode 120 is 0.2mm, 0.3mm, 0.5mm, 0.7mm, 1mm, 1.2mm, 1.5mm, 1.7mm, or 2mm. Alternatively, the spacing between the positive gate electrode 110 and the adjacent negative gate electrode 120 may be between any two of the above spacings.

[0047] Reference Figure 1 As shown, as an example of this embodiment, the spacing between two adjacent positive conductive strips 130 is 10mm to 30mm. This spacing setting helps to save material usage of the positive conductive strips 130 while minimizing the carrier transport path.

[0048] In some examples of this embodiment, the spacing between two adjacent positive conductive strips 130 is 10mm, 15mm, 20mm, 25mm, or 30mm, or the spacing between two adjacent positive conductive strips 130 can be between any two of the above spacings.

[0049] Reference Figure 1 As shown, as an example of this embodiment, the spacing between two adjacent negative electrode conductive strips 140 is 10mm to 30mm. This spacing setting helps to save material usage of the negative electrode conductive strips 140 while minimizing the carrier transport path.

[0050] In some examples of this embodiment, the spacing between two adjacent negative conductive strips 140 is 10mm, 15mm, 20mm, 25mm, or 30mm, or the spacing between two adjacent negative conductive strips 140 can be between any two of the above spacings.

[0051] As an example of this embodiment, the positive electrode conductive strip 130 is disposed on the central region of the positive electrode 111, and the negative electrode conductive strip 140 is disposed on the central region of the negative electrode 121.

[0052] Reference Figure 1As shown, as an example of this embodiment, the solar cell further comprises a negative electrode insulator 160 and a positive electrode insulator 150, the negative electrode insulator 160 is arranged on the negative electrode interval area 122 and covers the top wall and the side wall of the positive electrode conductive strip 130, and the positive electrode insulator 150 is arranged on the positive electrode interval area 112 and covers the top wall and the side wall of the negative electrode conductive strip 140. It can be understood that the positive electrode conductive strip 130 is arranged in the negative electrode interval area 122, so the negative electrode insulator 160 arranged on the negative electrode interval area 122 can cover the positive electrode conductive strip 130, and when the negative electrode ribbon 220 is arranged on the negative grid line electrode 120, the negative electrode insulator 160 can be used to insulate and separate the negative electrode ribbon 220 and the positive electrode conductive strip 130 to avoid short circuit problems. Similarly, the positive electrode insulator 150 can cover the negative electrode conductive strip 140 to insulate and separate the positive electrode ribbon 210 and the negative electrode conductive strip 140 to avoid short circuit problems.

[0053] Referring to Figure 1 As shown, as an example of this embodiment, the length of the positive electrode insulator 150 in the first direction can be less than or equal to the interval between two adjacent positive sub-electrodes 111, so that the positive electrode insulator 150 is located between two adjacent positive sub-electrodes 111 and does not cover the positive sub-electrode 111, thereby ensuring that the contact performance between the positive sub-electrode 111 and the positive electrode ribbon 210 is not affected. The length of the negative electrode insulator 160 in the first direction can be less than or equal to the interval between two adjacent negative sub-electrodes 121, so that the negative electrode insulator 160 is located between two adjacent negative sub-electrodes 121 and does not cover the negative sub-electrode 121, thereby ensuring that the contact performance between the negative sub-electrode 121 and the negative electrode ribbon 220 is not affected.

[0054] Referring to Figure 1 As shown, as an example of this embodiment, the width of the positive electrode insulator 150 in the second direction can be greater than the width of the positive electrode ribbon 210 arranged subsequently, so that the positive electrode ribbon 210 and the negative electrode conductive strip 140 are sufficiently insulated. The width of the negative electrode insulator 160 in the second direction can be greater than the width of the negative electrode ribbon 220 arranged subsequently, so that the negative electrode ribbon 220 and the negative electrode conductive strip 140 are sufficiently insulated.

[0055] As an example of this embodiment, the negative electrode insulator 160 and the positive electrode insulator 150 are both insulating glue, the negative electrode insulator 160 is adhered to the cell substrate 100 and the positive electrode conductive strip 130, and the positive electrode insulator 150 is adhered to the cell substrate 100 and the negative electrode conductive strip 140. The insulating glue can play a certain fixing role, which is conducive to ensuring that the positions of the positive electrode conductive strip 130 and the negative electrode conductive strip 140 are relatively stable.

[0056] As an example of this embodiment, the positive conductive strips 130 and the negative conductive strips 140 are each conductive glue, the positive conductive strips 130 are adhered to the battery substrate 100 and the positive grid line electrodes 110, which can make the positions of the positive conductive strips 130 and the positive grid line electrodes 110 more stable. The negative conductive strips 140 are adhered to the battery substrate 100 and the negative grid line electrodes 120, which can make the positions of the negative conductive strips 140 and the negative grid line electrodes 120 more stable.

[0057] As an example of this embodiment, the material of the positive grid line electrodes 110 and the material of the negative grid line electrodes 120 can each independently be selected from silver, aluminum, iron, copper, or tin.

[0058] Further, the utility model provides a photovoltaic module. Figure 2 It is a kind of photovoltaic module's structural schematic diagram, refer to Figure 2 As shown in the drawing, the photovoltaic module includes a plurality of positive welding strips 210, a plurality of negative welding strips 220 and the solar cell of any one of the above embodiments, the plurality of positive welding strips 210 are welded on the plurality of positive grid line electrodes 110, and the positive welding strip 210 is in electrical contact with the positive conductive strip 130 and is insulated between the negative conductive strip 140. The plurality of negative welding strips 220 are welded on the plurality of negative grid line electrodes 120, and the negative welding strip 220 is in electrical contact with the negative conductive strip 140 and is insulated between the positive conductive strip 130.

[0059] It can be understood that in this embodiment, the plurality of positive welding strips 210 and the plurality of positive grid line electrodes 110 are one-to-one corresponding, and the plurality of positive sub-electrodes 111 in each positive grid line electrode 110 is welded on one positive welding strip 210. The plurality of negative welding strips 220 and the plurality of negative grid line electrodes 120 are one-to-one corresponding, and the plurality of negative sub-electrodes 121 in each negative grid line electrode 120 is welded on one negative welding strip 220. The positive welding strip 210 intersects with the negative conductive strip 140, and the intersection area of the positive welding strip 210 and the negative conductive strip 140 is spaced by the positive insulator 150. The negative welding strip 220 intersects with the positive conductive strip 130, and the intersection area of the negative welding strip 220 and the positive conductive strip 130 is spaced by the negative insulator 160.

[0060] Refer to Figure 2As shown, as an example of this embodiment, the photovoltaic module further comprises a positive conductive adhesive 230 and a negative conductive adhesive 240. The positive conductive adhesive 230 is arranged on the area of the positive bus ribbon 130 overlapped by the positive ribbon tab 210, and adheres to the cell substrate 100 and contacts the positive ribbon tab 210 and the positive bus ribbon 130. The negative conductive adhesive 240 is arranged on the area of the negative bus ribbon 140 overlapped by the negative ribbon tab 220, and adheres to the cell substrate 100 and contacts the negative ribbon tab 220 and the negative bus ribbon 140. The positive conductive adhesive 230 arranged further enhances the current conduction performance between the positive ribbon tab 210 and the positive bus ribbon 130, and can firmly fix the positive ribbon tab 210 on the positive bus ribbon 130. The negative conductive adhesive 240 arranged further enhances the current conduction performance between the negative ribbon tab 220 and the negative bus ribbon 140, and can firmly fix the negative ribbon tab 220 on the negative bus ribbon 140.

[0061] As an example of this embodiment, the material of the positive conductive adhesive 230 is the same as that of the positive bus ribbon 130, and the material of the negative conductive adhesive 240 is the same as that of the negative bus ribbon 140.

[0062] Referring to Figure 2 As shown, as an example of this embodiment, the photovoltaic module comprises a plurality of solar cells arranged side by side, and in the two adjacent solar cells, the positive ribbon tab 210 on one of the solar cells is connected to the negative ribbon tab 220 on the other solar cell. This makes the plurality of solar cells connected in series as a cell string.

[0063] As an example of this embodiment, the material of the positive ribbon tab 210 can be the same as that of the negative ribbon tab 220. The positive ribbon tab 210 on one of the solar cells and the negative ribbon tab 220 on the other solar cell connected thereto can be in an integrated structure.

[0064] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered as within the scope of the present disclosure.

[0065] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A solar cell, characterized by, The battery substrate (100), a plurality of positive grid line electrodes (110), a plurality of negative grid line electrodes (120), a positive conductive strip (130) and a negative conductive strip (140) are included. The positive grid line electrodes (110) and the negative grid line electrodes (120) are arranged on the back light surface of the battery substrate (100), each of the positive grid line electrodes (110) includes a plurality of positive sub-electrodes (111) extending in the same direction, and two adjacent positive sub-electrodes (111) are spaced by a positive interval (112), and each of the negative grid line electrodes (120) includes a plurality of negative sub-electrodes (121) extending in the same direction, and two adjacent negative sub-electrodes (121) are spaced by a negative interval (122). The positive conductive strip (130) intersects and electrically contacts the positive sub-electrodes (111) in the plurality of positive grid line electrodes (110), and the positive conductive strip (130) is arranged in the negative interval (122) and spaced from the negative sub-electrode (121); the negative conductive strip (140) intersects and electrically contacts the negative sub-electrode (121) in the plurality of negative grid line electrodes (120), and the negative conductive strip (140) is arranged in the positive interval (112) and spaced from the positive sub-electrode (111).

2. The solar cell according to claim 1, characterized in that, The plurality of positive grid line electrodes (110) and the plurality of negative grid line electrodes (120) extend along a first direction, and the positive conductive strip (130) and the negative conductive strip (140) extend along a second direction intersecting the first direction.

3. The solar cell according to claim 2, characterized in that, The positive intervals (112) in the plurality of positive grid line electrodes (110) are arranged flush in the second direction, and the negative conductive strip (140) is arranged in the plurality of positive intervals (112) arranged flush in the second direction; The negative intervals (122) in the plurality of negative grid line electrodes (120) are arranged flush in the second direction, and the positive conductive strip (130) is arranged in the plurality of negative intervals (122) arranged flush in the second direction.

4. The solar cell according to claim 3, characterized in that, The positive grid line electrodes (110) and the negative grid line electrodes (120) are alternately and spaced arranged; and / or, The positive conductive strip (130) and the negative conductive strip (140) are alternately and spaced arranged.

5. The solar cell according to claim 4, characterized in that, The spacing between the positive grid line electrode (110) and the adjacent negative grid line electrode (120) is 0.2mm-2mm; and / or, The spacing between two adjacent positive conductive strips (130) is 10mm-30mm; and / or, The spacing between two adjacent negative conductive strips (140) is 10mm-30mm.

6. The solar cell according to any one of claims 1 to 4, wherein The solar cell further comprises a negative electrode insulator (160) and a positive electrode insulator (150), the negative electrode insulator (160) is arranged on the negative electrode interval area (122) and covers the top wall and the side wall of the positive electrode conductive strip (130), and the positive electrode insulator (150) is arranged on the positive electrode interval area (112) and covers the top wall and the side wall of the negative electrode conductive strip (140).

7. The solar cell according to claim 6, characterized in that The negative electrode insulator (160) and the positive electrode insulator (150) are both insulating glue, the negative electrode insulator (160) is adhered to the cell substrate (100) and the positive electrode conductive strip (130), and the positive electrode insulator (150) is adhered to the cell substrate (100) and the negative electrode conductive strip (140); and / or, The positive electrode conductive strip (130) and the negative electrode conductive strip (140) are both conductive glue, the positive electrode conductive strip (130) is adhered to the cell substrate (100) and the positive grid line electrode (110), and the negative electrode conductive strip (140) is adhered to the cell substrate (100) and the negative grid line electrode (120).

8. A photovoltaic module, characterized by, The photovoltaic module comprises a plurality of positive electrode solder strips (210), a plurality of negative electrode solder strips (220) and the solar cell according to any one of claims 1-7, the plurality of positive electrode solder strips (210) are correspondingly soldered on the plurality of positive grid line electrodes (110), the positive electrode solder strip (210) is in electrical contact with the positive electrode conductive strip (130) and is insulated from the negative electrode conductive strip (140), and the plurality of negative electrode solder strips (220) are correspondingly soldered on the plurality of negative grid line electrodes (120), the negative electrode solder strip (220) is in electrical contact with the negative electrode conductive strip (140) and is insulated from the positive electrode conductive strip (130).

9. The photovoltaic module of claim 8, wherein, The photovoltaic module further comprises a positive electrode conductive glue (230) and a negative electrode conductive glue (240); The positive electrode conductive glue (230) is arranged on the overlapping area of the positive electrode solder strip (210) and the positive electrode conductive strip (130), and adheres to the cell substrate (100) and contacts the positive electrode solder strip (210) and the positive electrode conductive strip (130); The negative electrode conductive glue (240) is arranged on the overlapping area of the negative electrode solder strip (220) and the negative electrode conductive strip (140), and adheres to the cell substrate (100) and contacts the negative electrode solder strip (220) and the negative electrode conductive strip (140).

10. The photovoltaic module according to claim 8 or 9, characterized in that The photovoltaic module comprises a plurality of solar cells arranged side by side, in two adjacent solar cells, the positive electrode solder strip (210) on one of the solar cells is connected with the negative electrode solder strip (220) on the other solar cell.

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