Back contact battery, battery string and battery assembly

Abstract

The utility model is suitable for the technical field of photovoltaic cells, and provides a back contact cell, a cell string and a cell assembly, the back surface of the back contact cell is provided with an anode vertical lead, a cathode vertical lead, and anode transverse grids and cathode transverse grids which are alternately arranged; the anode vertical wire is communicated with one end of the anode transverse grid, and the cathode vertical wire is communicated with the other end of the cathode transverse grid; the positive transverse grid comprises a first positive transverse grid provided with a first discontinuous region and a second positive transverse grid not provided with a first discontinuous region, the first positive transverse grid arranged between the first discontinuous region and the negative vertical wire is a first grid section, and at least one first grid section and one second positive transverse grid which are adjacent to each other are connected through a first auxiliary grid line; and the line width of the second positive transverse grid is larger than that of the other positive transverse grids. The stability is better due to the wider line width, the structural strength of the second positive electrode grid line is further improved, and the reliability of current transmission is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic cells, and particularly relates to a back-contact battery, a battery string and a battery module. Background Art

[0002] In modern energy systems, as important energy storage and power generation devices, photovoltaic cells are widely used in the utilization of renewable energy and various electronic devices. In order to improve the current conduction efficiency and reliability of photovoltaic cells, the grid line design of the cells is particularly crucial. Conventional grid line structures usually include positive and negative horizontal grids, and the flow of current is collected and guided through the design of these horizontal grids. Some grid lines need to transfer and guide more current, and when the flowing current increases, it is easy to cause grid line breakage, thereby affecting the current collection efficiency. Summary of the Utility Model

[0003] The utility model provides a back-contact battery, a battery string and a battery module, aiming to solve the problem that the grid line breakage of a photovoltaic cell affects the current collection efficiency of the photovoltaic cell.

[0004] The utility model is realized as follows. A back-contact battery is characterized in that positive vertical conductors, negative vertical conductors, and alternately arranged positive horizontal grids and negative horizontal grids are provided on the back surface of the back-contact battery;

[0005] One end of the positive vertical conductor is connected to one end of the positive horizontal grid, and one end of the negative vertical conductor is connected to the other end of the negative horizontal grid;

[0006] The positive horizontal grid includes a first positive horizontal grid provided with a first discontinuous area and a second positive horizontal grid not provided with a first discontinuous area. The first positive horizontal grid located between the first discontinuous area and the negative vertical conductor is a first grid segment, and at least one adjacent first grid segment and one second positive horizontal grid are connected by a first auxiliary grid line. The line width of this second positive horizontal grid is greater than the line widths of the other positive horizontal grids;

[0007] And / or, the negative horizontal grid includes a first negative horizontal grid provided with a second discontinuous area and a second negative horizontal grid not provided with a second discontinuous area. The first negative horizontal grid located between the second discontinuous area and the positive vertical conductor is a second grid segment, and at least one adjacent second grid segment and one second negative horizontal grid are connected by a second auxiliary grid line. The line width of this second negative horizontal grid is greater than the line widths of the other negative horizontal grids.

[0008] Optionally, the line width of the second positive horizontal grid connected to the first auxiliary grid line is 1.2 to 3 times the line widths of the other positive horizontal grids;

[0009] And / or, the line width of the second negative horizontal grid connected to the second sub-grid line is 1.2 to 3 times the line width of the remaining negative horizontal grids.

[0010] Optionally, it further includes a first Pad point, at least part of the first Pad point is placed in the second discontinuous area, a third discontinuous area is provided on part of the positive horizontal grids, the positive horizontal grid between the third discontinuous area and the negative vertical conductor is a third grid segment, the second sub-grid line penetrates through the third discontinuous area, and the third grid segment is electrically connected to the first Pad point;

[0011] And / or, it further includes a second Pad point, at least part of the second Pad point is placed in the first discontinuous area, a fourth discontinuous area is provided on part of the first positive horizontal grids, the second sub-grid line is placed in the fourth discontinuous area, the positive horizontal grid between the fourth discontinuous area and the positive vertical conductor is a fourth grid segment, the second sub-grid line penetrates through the fourth discontinuous area, and the fourth grid segment is electrically connected to the second Pad point.

[0012] Optionally, both the positive horizontal grids and the negative horizontal grids extend along a first direction, both the positive vertical conductors and the negative vertical conductors extend along a second direction, a plurality of first Pad points arranged along the second direction are provided on the positive horizontal grids, a plurality of second Pad points arranged along the second direction are provided on the negative horizontal grids, and the first direction intersects with the second direction.

[0013] Optionally, both the first sub-grid line and the second sub-grid line extend along the second direction.

[0014] Optionally, the first Pad point is electrically connected to a plurality of the first positive horizontal grids, and / or, the second Pad point is electrically connected to a plurality of the first negative horizontal grids.

[0015] Optionally, a first discontinuous area is provided on each of a plurality of the first positive horizontal grids;

[0016] And / or, a second discontinuous area is provided on each of a plurality of the first negative horizontal grids.

[0017] Optionally, a third discontinuous area is provided on a plurality of the positive horizontal grids;

[0018] And / or, a fourth discontinuous area is provided on a plurality of the negative horizontal grids.

[0019] The present invention further provides a battery string, which includes a plurality of the above-mentioned back-contact batteries.

[0020] The present invention further provides a battery module, which includes the above-mentioned battery string.

[0021] The beneficial effects achieved by the present utility model are as follows. By providing a positive vertical wire and a positive horizontal grid to conduct the forward current, and a negative vertical wire and a negative horizontal grid to conduct the negative current. The first auxiliary grid line connects the adjacent first grid segment and the second positive horizontal grid, and the second auxiliary grid line connects the adjacent second grid segment and the second negative horizontal grid, avoiding the carrier loss in the regions where the first grid segment and the second grid segment are located. The line width of the second positive horizontal grid connected to the first auxiliary grid line is greater than the line widths of the other positive horizontal grids, and the line width of the second negative horizontal grid connected to the second auxiliary grid line is greater than the line widths of the other negative horizontal grids, further improving the structural strength of the second negative grid line and the second positive grid line, ensuring the reliability of current transmission, and guaranteeing the current collection efficiency. Description of the Drawings

[0022] Figure 1 is the schematic diagram of the first part of the structure of the first back-contact battery provided by the present utility model;

[0023] Figure 2 is the schematic diagram of the second part of the structure of the first back-contact battery provided by the present utility model;

[0024] Figure 3 is the schematic diagram of the first part of the structure of the second back-contact battery provided by the present utility model;

[0025] Figure 4 is the schematic diagram of the second part of the structure of the second back-contact battery provided by the present utility model;

[0026] Figure 5 is the schematic diagram of the first part of the structure of the third back-contact battery provided by the present utility model;

[0027] Figure 6 is the schematic diagram of the second part of the structure of the third back-contact battery provided by the present utility model.

[0028] Explanation of the Reference Numerals in the Drawings:

[0029] 100, back-contact battery; 110, positive vertical wire; 120, negative vertical wire; 130, positive horizontal grid; 131, first positive horizontal grid; 1311, first grid segment; 132, second positive horizontal grid; 133, first discontinuous area; 134, third discontinuous area; 135, third grid segment; 140, first auxiliary grid line; 150, negative horizontal grid; 151, first negative horizontal grid; 1511, second grid segment; 152, second negative horizontal grid; 153, second discontinuous area; 154, fourth discontinuous area; 155, fourth grid segment; 160, second auxiliary grid line; 170, first Pad point; 180, second Pad point;

[0030] 101, positive wire; 102, negative wire. Detailed Embodiment

[0031] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model. In addition, it should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection, an electrical connection or a connection that can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the case where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, components and settings of specific examples are described hereinafter. Of course, they are merely examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the application of other processes and / or the use of other materials.

[0037] The present utility model conducts the forward current by providing a positive vertical wire and a positive horizontal grid, and conducts the negative current by providing a negative vertical wire and a negative horizontal grid. The first sub-grid line connects adjacent first grid segments and the second positive horizontal grid, and the second sub-grid line connects adjacent second grid segments and the second negative horizontal grid, avoiding the carrier loss in the regions where the first grid segment and the second grid segment are located. The line width of the second positive horizontal grid connected to the first sub-grid line is greater than the line widths of the other positive horizontal grids, and the line width of the second negative horizontal grid connected to the second sub-grid line is greater than the line widths of the other negative horizontal grids, further improving the structural strength of the second negative grid line and the second positive grid line and ensuring the reliability of current transmission.

[0038] Example 1

[0039] As Figures 1 to 6 shown, this embodiment provides a back-contact battery 100. The back surface of the back-contact battery 100 is provided with a positive vertical wire 110, a negative vertical wire 120, and alternately arranged positive horizontal grids 130 and negative horizontal grids 150;

[0040] The positive vertical wire 110 is communicated with one end of the positive horizontal grid 130, and the negative vertical wire 120 is communicated with the other end of the negative horizontal grid 150;

[0041] The positive electrode horizontal grid 130 includes a first positive electrode horizontal grid 131 provided with a first discontinuous region 133 and a second positive electrode horizontal grid 132 not provided with the first discontinuous region 133. A section of the positive electrode horizontal grid 130 placed between the first discontinuous region 133 and the negative electrode vertical wire 120 is the first grid section 1311. At least one adjacent first grid section 1311 and a second positive electrode horizontal grid 132 are connected by a first auxiliary grid wire 140. The wire width of this second positive electrode horizontal grid 132 is greater than the wire widths of the remaining positive electrode horizontal grids 130.

[0042] And / or, the negative electrode horizontal grid 150 includes a first negative electrode horizontal grid 151 provided with a second discontinuous region 153 and a second negative electrode horizontal grid 152 not provided with the second discontinuous region 153. A section of the first negative electrode horizontal grid 151 placed between the second discontinuous region 153 and the positive electrode vertical wire 110 is the second grid section 1511. At least one adjacent second grid section 1511 and a second negative electrode horizontal grid 152 are connected by a second auxiliary grid wire 160. The wire width of this second negative electrode horizontal grid 152 is greater than the wire widths of the remaining negative electrode horizontal grids 150.

[0043] The back surface of the back contact battery 100 includes a positive electrode vertical wire 110, a negative electrode vertical wire 120, a positive electrode horizontal grid 130, and a negative electrode horizontal grid 150. The positive electrode horizontal grid 130 and the negative electrode horizontal grid 150 are arranged alternately. The positive electrode vertical wire 110 is arranged at a position close to the battery edge and is connected to one end of the positive electrode horizontal grid 130. Each positive electrode grid wire can establish a current path through the positive electrode vertical wire 110. The positive electrode vertical wire 110 can specifically be a main grid, a welding tape, etc., which is not limited herein. The negative electrode vertical wire 120 is arranged at a position close to the battery edge and is connected to the other end of the negative electrode horizontal grid 150, that is, the negative electrode vertical wire 120 is placed at a position opposite to the positive electrode vertical wire 110 to avoid the connection between the positive electrode vertical wire 110 and the negative electrode vertical wire 120. Each negative electrode grid wire can establish a current path through the negative electrode vertical wire 120. The negative electrode vertical wire 120 can specifically be a main grid, a welding tape, etc., which is not limited herein.

[0044] The positive electrode horizontal grid 130 includes a first positive electrode horizontal grid 131 and a second positive electrode horizontal grid 132. The first positive electrode horizontal grid 131 is provided with a first discontinuous region 133. The first discontinuous region 133 divides the first positive electrode horizontal grid 131 into two sections. Among them, the first positive electrode horizontal grid 131 on the side of the first discontinuous region 133 close to the negative electrode vertical wire 120 is the first grid section 1311, and no current paths are established at both ends of the first grid section 1311. The first positive electrode horizontal grid 131 on the side of the first discontinuous region 133 far from the negative electrode vertical wire 120 can be electrically connected to the negative electrode vertical wire. Solder joints, connection points, and their connecting wires, etc., can be arranged in the first discontinuous region 133 to avoid the contact between the arranged solder joints, connection points, and their connecting wires, etc., and the positive electrode horizontal grid 130, thereby avoiding the occurrence of short circuits and other situations. The second positive electrode horizontal grid 132 is not provided with the first discontinuous region 133, and the second positive electrode horizontal grid 132 is connected to the positive electrode vertical wire 110.

[0045] The first auxiliary gate line 140 connects at least one first gate segment 1311 and the adjacent second positive horizontal gate 132, so that the first gate segment 1311 and the second positive horizontal gate 132 establish a current path. Specifically, a first auxiliary gate line 140 connects a first gate segment 1311 and a second positive horizontal gate 132 to form a structure similar to the Chinese character "I", such as Figure 2 As shown, a first secondary gate line 140 may also connect two first gate segments 1311 and a second positive horizontal gate 132 to form a structure similar to the Chinese character "王", as shown in FIG. Figure 4 As shown, other numbers of first gate segments 1311 may be connected, which is not limited here.

[0046] The line width of the second positive horizontal grid 132 connected to the first secondary grid line 140 is greater than the line width of the remaining positive horizontal grids 130. The wider the line width, the better the stability and the lower the probability of grid breakage, which is beneficial to the stability of the subsequent use of the product. It is understood that the line width of the second positive horizontal grid 132 not connected to the first secondary grid line 140 is equal to the line width of the remaining positive horizontal grids 130.

[0047] The negative electrode horizontal grid 150 includes a first negative electrode horizontal grid 151 and a second negative electrode horizontal grid 152. The first negative electrode horizontal grid 151 is provided with a second interruption region 153, which divides the first negative electrode horizontal grid 151 into two sections. The second interruption region 153 on the side of the first negative electrode horizontal grid 151 closest to the positive electrode vertical conductor 110 is the second grid segment 1511. No current path is established at either end of the second grid segment 1511. The second interruption region 153 on the side of the first negative electrode horizontal grid 151 away from the positive electrode vertical conductor 110 can be electrically connected to the positive electrode vertical conductor 110. Welding points, connection points, and their connecting lines can be provided within the second interruption region 153 to prevent contact between the welding points, connection points, and their connecting lines and the negative electrode horizontal grid 150, thereby preventing short circuits. The second negative electrode horizontal grid 152 is not provided with a second interruption region 153 and is connected to the negative electrode vertical conductor 120.

[0048] The second auxiliary gate line 160 connects at least one second gate segment 1511 and the adjacent second negative cross gate 152, so that a current path is established between the second gate segment 1511 and the second negative cross gate 152. Specifically, a second auxiliary gate line 160 can connect a second gate segment 1511 and a second negative cross gate 152 to form a structure similar to the Chinese character "I", such as Figure 1 As shown, a second secondary gate line 160 may also connect two second gate segments 1511 and a second negative horizontal gate 152 to form a structure similar to the Chinese character "王", as shown in FIG. Figure 3 As shown, other numbers of second gate segments 1511 may be connected, which is not limited here.

[0049] The line width of the second negative horizontal grid 152 connected to the second auxiliary grid line 160 is greater than that of the remaining negative horizontal grids 150. The wider the line width, the better its stability, and the lower the probability of grid breakage, which is beneficial to the stability of the subsequent use of the product. It can be understood that the line width of the second negative horizontal grid 152 not connected to the second auxiliary grid line 160 is equal to that of the remaining negative horizontal grids 150.

[0050] It can be understood that the first auxiliary grid line 140 is connected to the positive horizontal grid 130, and a positive current flows through the first auxiliary grid line 140. The second auxiliary grid line 160 is connected to the negative horizontal grid 150, and a negative current flows through the second auxiliary grid line 160. If the first auxiliary grid line 140 intersects with the negative horizontal grid 150, an insulating layer is provided at the intersection. If the second auxiliary grid line 160 intersects with the positive horizontal grid 130, an insulating layer is also provided at the intersection.

[0051] In this embodiment, the positive vertical conductor 110 and the positive horizontal grid 130 are provided to conduct the positive current, and the negative vertical conductor 120 and the auxiliary negative horizontal grid are provided to conduct the negative current. The first auxiliary grid line 140 connects the adjacent first grid segment 1311 and the second positive horizontal grid 132, and the second auxiliary grid line 160 connects the adjacent second grid segment 1511 and the second negative horizontal grid 152, avoiding the carrier loss in the regions where the first grid segment 1311 and the second grid segment 1511 are located. The line width of the second positive horizontal grid 132 connected to the first auxiliary grid line 140 is greater than that of the remaining positive horizontal grids 130, and the line width of the second negative horizontal grid 152 connected to the second auxiliary grid line 160 is greater than that of the remaining negative horizontal grids 150, further improving the structural strength of the second negative grid line and the second positive grid line, ensuring the reliability of current transmission, and guaranteeing the current collection efficiency.

[0052] Such as Figure 5 and Figure 6 As shown, in some embodiments, the back-contact battery 100 further includes at least one positive electrode wire 101 having the same extending direction as the positive vertical conductor 110, and at least one negative electrode wire 102 having the same extending direction as the negative vertical conductor 120. The positive electrode wire 101 and the negative electrode wire 102 are alternately arranged and disposed between the positive vertical conductor 110 and the negative vertical conductor 120. The negative electrode wire 102 is adjacent to the positive vertical conductor 110, and the positive electrode wire 101 is adjacent to the negative vertical conductor 120. The first positive horizontal grid 131 on the side of the first discontinuous region 133 away from the negative vertical conductor 120 can be electrically connected to the adjacent negative electrode wire 102. The first negative horizontal grid 151 on the side of the second discontinuous region 153 away from the positive vertical conductor 110 can be electrically connected to the adjacent positive electrode wire 101.

[0053] Specifically, Pad points can also be provided on the negative electrode wire 102 and the positive electrode wire 101 for testing or connection.

[0054] Example 2

[0055] On the basis of the first embodiment, the line width of the second positive cross-grid 132 connected to the first sub-grid line 140 is 1.2 to 3 times the line width of the remaining positive cross-grids 130;

[0056] And / or, the line width of the second negative cross-grid 152 connected to the second sub-grid line 160 is 1.2 to 3 times the line width of the remaining negative cross-grids 150.

[0057] The multiple of the line width of the second positive cross-grid 132 connected to the first sub-grid line 140 to the line width of the remaining positive cross-grids 130 can be: 1.2 times, 1.3 times, 1.4 times, 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2 times, 2.1 times, 2.2 times, 2.3 times, 2.4 times, 2.5 times, 2.6 times, 2.7 times, 2.8 times, 2.9 times, 3 times, etc. It is not limited to the above values, and can also be other multiple values greater than 1.2 and less than 3. Specifically, the line width of the second positive cross-grid 132 connected to the first sub-grid line 140 can be 24 μm, and the line width of the remaining positive cross-grids 130 is 14 μm.

[0058] The line width of the second positive cross-grid 132 connected to the first sub-grid line 140 is designed to be 1.2 to 3 times the line width of the other negative cross-grids 150. The line width of the second positive cross-grid 132 connected to the first sub-grid line 140 is greater than or equal to 1.2 times the line width of the other negative cross-grids 150. A wider width helps the second positive cross-grid 132 provide greater current collection ability, optimize the current collection and conduction efficiency, and avoid the occurrence of broken grids. At the same time, the line width of the second positive cross-grid 132 connected to the first sub-grid line 140 is less than or equal to 3 times the line width of the other negative cross-grids 150, avoiding material waste and obvious unevenness in the appearance of the battery surface.

[0059] The multiple of the line width of the second negative cross-grid 152 connected to the second sub-grid line 160 to the line width of the remaining negative cross-grids 150 can be: 1.2 times, 1.3 times, 1.4 times, 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2 times, 2.1 times, 2.2 times, 2.3 times, 2.4 times, 2.5 times, 2.6 times, 2.7 times, 2.8 times, 2.9 times, 3 times, etc. It is not limited to the above values, and can also be other multiple values greater than 1.2 and less than 3. Specifically, the line width of the second negative cross-grid 152 connected to the second sub-grid line 160 can be 24 μm, and the line width of the remaining negative cross-grids 150 is 14 μm.

[0060] The line width of the second negative horizontal grid 152 connected to the second sub-grid line 160 is designed to be 1.2 to 3 times the line width of the other negative horizontal grids 150. The line width of the second negative horizontal grid 152 connected to the first sub-grid line 140 is greater than or equal to 1.2 times the line width of the other negative horizontal grids 150. The wider width helps the second negative horizontal grid 152 provide greater current collection ability, optimize the current collection and conduction efficiency, and avoid the occurrence of broken grids. At the same time, the line width of the second negative horizontal grid 152 connected to the first sub-grid line 140 is less than or equal to 3 times the line width of the other negative horizontal grids 150, avoiding material waste and obvious unevenness in the appearance of the battery surface.

[0061] Example 3

[0062] As Figure 1 Shown in FIGS. 6 to, on the basis of the first embodiment, it further includes a first Pad point 170. The first Pad point 170 is at least partially placed in the second discontinuous area 153. A third discontinuous area 134 is provided on a part of the positive horizontal grid 130. The negative horizontal grid 150 placed between the third discontinuous area 134 and the negative vertical conductor 120 is the third grid segment 135. The first sub-grid line 140 penetrates through the third discontinuous area 134, and the third grid segment 135 is electrically connected to the first Pad point 170;

[0063] And / or, it further includes a second Pad point 180. The second Pad point 180 is at least partially placed in the first discontinuous area 133. A fourth discontinuous area 154 is provided on a part of the first positive horizontal grid 131. The second sub-grid line 160 is placed in the fourth discontinuous area 154. The positive horizontal grid 130 placed between the fourth discontinuous area 154 and the positive vertical conductor 110 is the fourth grid segment 155. The second sub-grid line 160 penetrates through the fourth discontinuous area 154, and the fourth grid segment 155 is electrically connected to the second Pad point 180.

[0064] Pad points are usually used for current contact or test points, and Pad points have conductivity. The first Pad point 170 is at least partially placed in the second discontinuous area 153. Specifically, one first Pad point 170 can be completely placed between one second discontinuous area 153, or one first Pad point 170 can span at least two adjacent second discontinuous areas 153. A negative horizontal grid 150 is provided between two adjacent first positive horizontal grids 131. The first Pad point 170 is connected to the negative horizontal grid 150 and is not electrically connected to the first positive horizontal grid 131.

[0065] On the partial positive electrode horizontal grid 130, a third discontinuous region 134 is provided. The third discontinuous region 134 divides the positive electrode horizontal grid 130 into two segments. Among them, the one close to the negative electrode vertical wire 120 is the third grid segment 135. The third grid segment 135 is connected to the adjacent first Pad point 170 to establish a current path, so that the current of the third grid segment 135 can be conducted through the first Pad point 170. The positive electrode horizontal grid 130 can be the first positive electrode horizontal grid 131 or the second positive electrode horizontal grid 132.

[0066] The first auxiliary grid line 140 penetrates through the third discontinuous region 134 and connects the negative electrode horizontal grids 150 on both sides of the positive electrode horizontal grid 130 where the third discontinuous region 134 is located, so as to avoid contact between the first auxiliary grid segment and the positive electrode horizontal grid 130. Specifically, a third discontinuous region 134 can be provided on one positive electrode horizontal grid 130, and the first auxiliary grid line 140 penetrates through the third discontinuous region 134 to connect the second grid segments 1511 and the second negative electrode horizontal grid 152 on both sides of the positive electrode horizontal grid 130; or, third discontinuous regions 134 can be provided on at least two adjacent positive electrode horizontal grids 130, and the first auxiliary grid line 140 penetrates through at least two third discontinuous regions 134 to connect at least two second grid segments 1511 and the second negative electrode horizontal grids 152 on both sides of the positive electrode horizontal grids 130 passed through.

[0067] The second Pad point 180 is at least partially placed in the first discontinuous region 133. Specifically, one second Pad point 180 can be completely placed between one first discontinuous region 133, or one second Pad point 180 can span at least two adjacent first discontinuous regions 133. A positive electrode horizontal grid 130 is provided between two adjacent first negative electrode horizontal grids 151. The second Pad is connected to the positive electrode horizontal grid 130 and is not electrically connected to the first negative electrode horizontal grid 151.

[0068] On the partial negative electrode horizontal grid 150, a fourth discontinuous region 154 is provided. The fourth discontinuous region 154 divides the negative electrode horizontal grid 150 into two segments. Among them, the one close to the positive electrode vertical wire 110 is the fourth grid segment 155. The fourth grid segment 155 is connected to the adjacent second Pad point 180 to establish a current path, so that the current of the fourth grid segment 155 can be conducted through the second Pad point 180. The negative electrode horizontal grid 150 can be the first negative electrode horizontal grid 151 or the second negative electrode horizontal grid 152.

[0069] The second sub-grid line 160 penetrates through the fourth discontinuous area 154, connecting the positive grid bars 130 on both sides of the negative grid bar 150 where the fourth discontinuous area 154 is located, so as to avoid contact between the second sub-grid section and the positive grid bar 130. Specifically, a fourth discontinuous area 154 can be provided on a sub-negative grid bar, and the second sub-grid line 160 penetrates through the fourth discontinuous area 154 to connect the first grid section 1311 and the second positive grid bar 132 on both sides of the negative grid bar 150; alternatively, fourth discontinuous areas 154 can be provided on at least two adjacent negative grid bars 150, and the second sub-grid line 160 penetrates through the fourth discontinuous areas 154 on at least two positive grid bars 130 to connect at least two second grid sections 1511 and the second negative grid bar 152 on both sides of the penetrated positive grid bar 130.

[0070] Example 4

[0071] On the basis of Embodiment 3, both the positive grid bar 130 and the negative grid bar 150 extend along the first direction, both the positive vertical lead 110 and the negative vertical lead 120 extend along the second direction, a plurality of first Pad points 170 arranged along the second direction are provided on the positive grid bar 130, a plurality of second Pad points 180 arranged along the second direction are provided on the negative grid bar 150, and the first direction intersects with the second direction.

[0072] The first direction intersects with the second direction. Specifically, the first direction can be perpendicular to the second direction. Both the positive grid bar 130 and the negative grid bar 150 extend along the first direction, indicating that the horizontal conductive wires of the positive and negative electrodes are arranged in parallel and distributed along one side boundary of the battery or the entire battery surface. The positive vertical lead 110 and the negative vertical lead 120 extend along the second direction, which means that the vertical leads and the grid bars are perpendicular to each other and are arranged in a grid-like staggered layout, which can effectively distribute the current in a larger area range.

[0073] The first Pad points 170 and the second Pad points 180 extend along the second direction. The first Pad points 170 are used as current output contacts to collect the current conducted on the positive grid bar 130, and the second Pad points 180 are used as current output contacts to collect the current conducted on the negative grid bar 150. The Pad points are distributed at or near the intersection points of the grid formed by the vertical leads and the grid bars.

[0074] This design of the staggered layout of the positive and negative vertical leads 120 and the grid bars and the orderly arrangement of the Pad points optimizes the current conduction path and improves the current collection efficiency and thermal management performance of the battery. Through the grid-like structure, the battery can uniformly collect and conduct the current in different areas, reduce losses and improve the overall performance.

[0075] Example 5

[0076] Based on Embodiment 4, both the first sub-grid lines 140 and the second sub-grid lines 160 extend along the second direction.

[0077] The first sub-grid lines 140 and the second sub-grid lines 160 extend along the second direction, further optimizing the current conduction path of the battery, improving the current conduction efficiency, and reducing the problem of current density concentration. Visually, the arrangement of the grid lines is also neater.

[0078] Example 6

[0079] Based on Embodiment 3, the first Pad point 170 is electrically connected to a plurality of first positive horizontal grid lines 131, and / or the second Pad point 180 is electrically connected to a plurality of first negative horizontal grid lines 151.

[0080] Connecting multiple grid lines through one Pad point forms multiple parallel conduction paths. The increase in parallel paths means that current can be conducted to the Pad point through multiple channels, reducing the resistance and load of each grid line. This can effectively reduce the total resistance during current conduction and improve the current conduction efficiency. And when the current can be conducted to the same Pad point through multiple grid lines, the distribution of current in the battery will be more uniform. This reduces the risk of local current density concentration, avoids the situation of overloading or overheating of a certain grid line, and helps to improve the reliability and service life of the battery.

[0081] Example 7

[0082] Based on Embodiment 1, a first discontinuous area 133 is provided on each of a plurality of first positive horizontal grid lines 131;

[0083] and / or, a second discontinuous area 153 is provided on each of a plurality of first negative horizontal grid lines 151.

[0084] The first discontinuous area 133 and the second discontinuous area 153 respectively correspond to the discontinuities on the positive and negative horizontal grid lines 150. These areas are voids or disconnections on the grid lines, resulting in no direct electrical connection of the grid lines at these positions. Solder joints, connection points, etc. are set at these positions to avoid contact between the set solder joints, connection points, etc. and the disconnected positive and negative horizontal grid lines 150, thereby avoiding situations such as short circuits.

[0085] These discontinuities do not exist randomly, but are intentionally set according to the requirements of battery design to adjust the current conduction path or to reduce the current conduction in certain areas. The first discontinuous area 133 and the second discontinuous area 153 can be provided on multiple positive and negative horizontal grid lines respectively.

[0086] It can be understood that generally, one first positive electrode horizontal grid 131 is provided with one first discontinuous area 133, and one first negative electrode horizontal grid 151 is provided with one second discontinuous area 153. Providing multiple spaced areas on one horizontal grid is not conducive to the collection and conduction of current.

[0087] Example 8

[0088] Based on Embodiment 3, a third discontinuous area 134 is provided on several positive electrode horizontal grids 130;

[0089] and / or, a fourth discontinuous area 154 is provided on several negative electrode horizontal grids 150.

[0090] The third discontinuous area 134 is used to allow the second sub-grid line 160 to pass through, avoiding contact between the second sub-grid line 160 and the positive electrode horizontal grid 130. The fourth discontinuous area 154 is used to allow the first sub-grid line 140 to pass through, avoiding contact between the first sub-grid line 140 and the negative electrode horizontal grid 150.

[0091] A third discontinuous area 134 is provided on multiple positive electrode horizontal grids 130, and a fourth discontinuous area 154 is provided on multiple negative electrode horizontal grids 150. The specific number of settings is intentionally set according to the requirements of battery design, for adjusting the current conduction path, or for reducing the current conduction in certain areas.

[0092] Example 9

[0093] This embodiment provides a battery string, including multiple pieces of the above-mentioned back-contact battery 100.

[0094] The beneficial effects of the battery string in this embodiment are equivalent to those of the above-mentioned back-contact battery 100, and will not be elaborated here.

[0095] Example 10

[0096] This embodiment provides a battery module, including the above-mentioned battery string.

[0097] The beneficial effects of the battery module in this embodiment are equivalent to those of the above-mentioned battery string, and will not be elaborated here.

[0098] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A back-contact battery, characterized in that, The back of the back-contact battery is provided with a positive vertical conductor, a negative vertical conductor, and alternately arranged positive horizontal grids and negative horizontal grids; The positive vertical conductor is connected to one end of the positive horizontal grid, and the negative vertical conductor is connected to the other end of the negative horizontal grid; The positive horizontal grid includes a first positive horizontal grid provided with a first discontinuous area and a second positive horizontal grid not provided with a first discontinuous area. The first positive horizontal grid placed between the first discontinuous area and the negative vertical conductor is a first grid segment. At least one adjacent first grid segment and one second positive horizontal grid are connected by a first auxiliary grid line, and the line width of this second positive horizontal grid is greater than the line widths of the other positive horizontal grids; And / or, the negative horizontal grid includes a first negative horizontal grid provided with a second discontinuous area and a second negative horizontal grid not provided with a second discontinuous area. The first negative horizontal grid placed between the second discontinuous area and the positive vertical conductor is a second grid segment. At least one adjacent second grid segment and one second negative horizontal grid are connected by a second auxiliary grid line, and the line width of this second negative horizontal grid is greater than the line widths of the other negative horizontal grids.

2. The back-contact battery according to claim 1, characterized in that, The line width of the second positive horizontal grid connected to the first auxiliary grid line is 1.2 to 3 times the line width of the other positive horizontal grids; And / or, the line width of the second negative horizontal grid connected to the second auxiliary grid line is 1.2 to 3 times the line width of the other negative horizontal grids.

3. The back-contact battery according to claim 1, characterized in that, It further includes a first Pad point. At least part of the first Pad point is placed in the second discontinuous area. A third discontinuous area is provided on part of the positive horizontal grid. The positive horizontal grid placed between the third discontinuous area and the negative vertical conductor is a third grid segment. The second auxiliary grid line penetrates through the third discontinuous area, and the third grid segment is electrically connected to the first Pad point; And / or, it further includes a second Pad point. At least part of the second Pad point is placed in the first discontinuous area. A fourth discontinuous area is provided on part of the first positive horizontal grid. The second auxiliary grid line is placed in the fourth discontinuous area. The positive horizontal grid placed between the fourth discontinuous area and the positive vertical conductor is a fourth grid segment. The second auxiliary grid line penetrates through the fourth discontinuous area, and the fourth grid segment is electrically connected to the second Pad point.

4. The back-contact battery according to claim 3, characterized in that, Both the positive horizontal grid and the negative horizontal grid extend along a first direction, both the positive vertical conductor and the negative vertical conductor extend along a second direction. A plurality of first Pad points are arranged along the second direction on the positive horizontal grid, and a plurality of second Pad points are arranged along the second direction on the negative horizontal grid. The first direction intersects the second direction.

5. The back contact battery according to claim 4, wherein Both the first auxiliary grid line and the second auxiliary grid line extend along the second direction.

6. The back-contact battery according to claim 3, characterized in that, The first Pad point is electrically connected to a plurality of the first positive horizontal grids, and / or, the second Pad point is electrically connected to a plurality of the first negative horizontal grids.

7. The back-contact battery according to claim 1, wherein A first discontinuous area is provided on each of a plurality of the first positive horizontal grids; And / or, a second discontinuous area is provided on each of a plurality of the first negative horizontal grids.

8. The back-contact battery according to claim 6, wherein, A third discontinuous area is provided on a plurality of the positive horizontal grids; And / or, a fourth discontinuous area is provided on a plurality of the negative horizontal grids.

9. A battery string, characterized in that, It includes a plurality of back-contact batteries as described in any one of claims 1 to 8.

10. A battery assembly, characterized in that, Comprising a battery string as claimed in claim 9.

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