Battery piece, battery string, photovoltaic module and photovoltaic power generation system

Abstract

The utility model discloses a battery piece, a battery string, a photovoltaic assembly and a photovoltaic power generation system, the battery piece comprises a silicon wafer body, a plurality of first grid lines, a plurality of second grid lines, a first edge grid and a second edge grid line, and the first grid lines and the second grid lines are arranged on one side of the silicon wafer body in the thickness direction. The plurality of first grid lines and the plurality of second grid lines are alternately arranged at intervals along a first direction, the first grid lines and the second grid lines extend along a second direction, and the polarities of the first grid lines and the second grid lines are opposite; the first edge grid lines and the second edge grid lines extend in the first direction, and the first edge grid lines are connected with one ends, in the second direction, of the multiple first grid lines; the second edge grid lines are opposite to the first edge grid lines in the second direction, the second edge grid lines are connected with the other ends, in the second direction, of the multiple second grid lines, and the second edge grid lines are spaced from the other ends, in the second direction, of the multiple first grid lines. According to the battery piece provided by the utility model, the cost is reduced, and the electric quantity loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a battery sheet, a battery string, a photovoltaic component and a photovoltaic power generation system. Background Art

[0002] A back-contact solar cell is a cell in which both the emitter and base contact electrodes are placed on the back side (non-light-receiving side) of the cell, and the light-receiving side of the cell is not blocked by any metal electrode. In the related art, the cell has a main grid line design, which consumes a lot of silver and has high production costs. For a cell without a main grid, when the edge of the fine grid line breaks during the use of the cell, the current on some of the fine grid lines cannot be extracted, thereby increasing the power loss of the battery and having low reliability. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery cell, which reduces the production cost, arranges the first edge grid line and the second edge grid line reasonably, and can guide the current on the first grid line and the second grid line with broken edges, thereby reducing the power loss and improving the reliability of use.

[0004] The second objective of the present invention is to provide a battery string using the above-mentioned battery cell.

[0005] The third object of the present utility model is to provide a photovoltaic module using the above-mentioned battery sheet or the above-mentioned battery string.

[0006] The fourth object of the present utility model is to provide a photovoltaic power generation system using the above-mentioned battery cell, the above-mentioned battery string or the above-mentioned photovoltaic module.

[0007] According to the first aspect of the utility model, the battery cell comprises: a silicon wafer body; a plurality of first gate lines and a plurality of second gate lines, the first gate lines and the second gate lines are arranged on one side of the thickness direction of the silicon wafer body, the plurality of first gate lines and the plurality of second gate lines are alternately arranged along the first direction, the first gate lines and the second gate lines extend along the second direction, the polarities of the first gate lines and the second gate lines are opposite, and the first direction and the second direction are perpendicular; a first edge gate line, the first edge gate line extends along the first direction, the first edge gate line is connected to one end of the plurality of first gate lines along the second direction, and the first edge gate line is spaced apart from one end of the plurality of second gate lines along the second direction; a second edge gate line, the second edge gate line is opposite to the first edge gate line along the second direction, the second edge gate line extends along the first direction, the second edge gate line is connected to the other end of the plurality of second gate lines along the second direction, and the second edge gate line is spaced apart from the other end of the plurality of first gate lines along the second direction.

[0008] According to the battery cell of the utility model, the battery cell adopts a main grid line-free design, thereby avoiding the slurry loss of the main grid line, thereby reducing the production cost of the battery cell, simplifying the production steps of the battery cell, and improving the production efficiency of the battery cell. In addition, when the end of the first grid line close to the first edge grid line or the end of the second grid line close to the second edge grid line is broken, the current of the part of the first grid line or the upper part of the second grid line connected thereto can be derived through the first edge grid line or the second edge grid line, thereby reducing the current loss of the battery cell, thereby improving the reliability of the battery cell. In addition, the arrangement of the first edge grid line and the second edge grid line is reasonable and simple, which is more conducive to the use of the battery cell.

[0009] According to some embodiments of the present invention, one end of the first edge gate line is connected to the one end of the first gate line among the multiple first gate lines that is adjacent to the edge of one side of the silicon wafer body along the first direction, and the other end of the first edge gate line extends along the first direction to exceed the one end of the first gate line among the multiple first gate lines that is adjacent to the edge of the other side of the silicon wafer body; and / or, one end of the second edge gate line is connected to the one end of the second gate line among the multiple second gate lines that is adjacent to the edge of the other side of the silicon wafer body along the first direction, and the other end of the second edge gate line extends along the first direction to exceed the one end of the second gate line among the multiple second gate lines that is adjacent to the edge of one side of the silicon wafer body.

[0010] According to some embodiments of the present invention, a plurality of the first gate lines extend continuously along the second direction; and / or a plurality of the second gate lines extend continuously along the second direction.

[0011] According to some embodiments of the utility model, a plurality of first breaking openings are respectively formed on the plurality of first gate lines, the plurality of first breaking openings are arranged at intervals along the second direction, the number of the plurality of first breaking openings of the plurality of first gate lines is equal and they are respectively opposite to each other along the first direction; a plurality of second breaking openings are respectively formed on the plurality of second gate lines, the plurality of second breaking openings are arranged at intervals along the second direction, the number of the plurality of second breaking openings of the plurality of second gate lines is equal and they are respectively opposite to each other along the first direction, and the first breaking openings and the second breaking openings are arranged in a staggered manner.

[0012] According to some embodiments of the present invention, the length of the first break in the second direction is L1, wherein L1 satisfies: 0.4mm≤L1≤1.6mm; and / or the length of the second break in the second direction is L2, wherein L2 satisfies: 0.4mm≤L2≤1.6mm.

[0013] According to some embodiments of the present invention, the distance between the first edge gate line and the one end of the plurality of second gate lines along the second direction is a1, wherein a1 satisfies: 100um<a1<800um; and / or the distance between the second edge gate line and the other end of the plurality of first gate lines along the second direction is a2, wherein a2 satisfies: 100um<a2<800um.

[0014] According to some embodiments of the present invention, the first edge gate line has a width equal to that of the first gate line; and / or the second edge gate line has a width equal to that of the second gate line.

[0015] According to some embodiments of the present invention, the first gate line has a plurality of first electrical connection segments arranged at intervals, the length of the first electrical connection segment along the second direction is L3, the width of the first electrical connection segment along the first direction is w1, wherein L3 and w1 respectively satisfy: 0mm<L3≤1.5mm, 30μm≤w1≤80μm; and / or, the second gate line has a plurality of second electrical connection segments arranged at intervals, the length of the second electrical connection segment along the second direction is L4, the width of the first electrical connection segment along the first direction is w2, wherein L4 and w2 respectively satisfy: 0mm<L4≤1.5mm, 30μm≤w2≤80μm.

[0016] According to some embodiments of the present invention, the spacing between the first grid line and the adjacent second grid line is d1, wherein d1 satisfies: 0.4 mm≤d1≤1 mm.

[0017] According to some embodiments of the present invention, the spacing between two adjacent first grid lines is d2, wherein d2 satisfies: 0.8mm≤d2≤2mm; the spacing between two adjacent second grid lines is d3, wherein d3 satisfies: 0.8mm≤d3≤2mm.

[0018] The battery string according to the second aspect of the present invention comprises: a plurality of battery cells, wherein the battery cells are the battery cells according to the first aspect of the present invention; and a plurality of interconnecting structures, through which two adjacent battery cells are electrically connected.

[0019] According to some embodiments of the present invention, the plurality of interconnection structures include: a plurality of first interconnection structures, the plurality of first interconnection structures are arranged at intervals along the second direction, each of the first interconnection structures is respectively separated from the plurality of first gate lines, and each of the first interconnection structures is respectively electrically connected to the plurality of second gate lines; and a plurality of second interconnection structures, the plurality of second interconnection structures and the plurality of first interconnection structures are arranged alternately along the second direction, each of the second interconnection structures is respectively separated from the plurality of second gate lines, and each of the second interconnection structures is respectively electrically connected to the plurality of first gate lines.

[0020] According to some embodiments of the present invention, a plurality of first gate lines extend continuously along the second direction, each of the first interconnection structures is separated from the plurality of first gate lines by a plurality of first insulating connectors, and the plurality of first insulating connectors are respectively connected between the first interconnection structures and the plurality of first gate lines; and / or a plurality of second gate lines extend continuously along the second direction, each of the second interconnection structures is separated from the plurality of second gate lines by a plurality of second insulating connectors, and the plurality of second insulating connectors are respectively connected between the second interconnection structures and the plurality of second gate lines.

[0021] According to some embodiments of the present invention, the first insulating connector is insulating glue; and / or the second insulating connector is insulating glue.

[0022] According to some embodiments of the present invention, the first interconnection structure includes a first edge interconnection structure and a plurality of first sub-interconnection structures, the first edge interconnection structure is located on a side of the plurality of first sub-interconnection structures adjacent to the second edge gate lines, the plurality of first gate lines are continuous at a position opposite to the first edge interconnection structure, and the plurality of first gate lines are disconnected at a position opposite to the first sub-interconnection structure; the second interconnection structure includes a second edge interconnection structure and a plurality of second sub-interconnection structures, the second edge interconnection structure is located on a side of the plurality of second sub-interconnection structures adjacent to the first edge gate lines, the plurality of second gate lines are continuous at a position opposite to the second edge interconnection structure, and the plurality of second gate lines are disconnected at a position opposite to the second sub-interconnection structure.

[0023] According to some embodiments of the utility model, a third insulating connector is provided at a position where the plurality of first gate lines are opposite to the plurality of first interconnection structures, the third insulating connector is respectively provided at a position where the first edge interconnection structure is opposite to the plurality of first gate lines, and the plurality of third insulating connectors are respectively connected between the first edge interconnection structure and the plurality of first gate lines; a fourth insulating connector is provided at a position where the plurality of second gate lines are opposite to the second interconnection structure, the fourth insulating connector is respectively provided at a position where the second edge interconnection structure is opposite to the plurality of second gate lines, and the plurality of fourth insulating connectors are respectively connected between the first edge interconnection structure and the plurality of second gate lines.

[0024] According to some embodiments of the present invention, at least two of the third insulating connectors are provided between each of the first sub-interconnection structures and the plurality of the first gate lines, and the third insulating connectors are located at the disconnection between the first gate line and the first sub-interconnection structures; at least two of the fourth insulating connectors are provided between each of the second sub-interconnection structures and the plurality of the second gate lines, and the fourth insulating connectors are located at the disconnection between the second gate line and the second sub-interconnection structures.

[0025] According to some embodiments of the present invention, at least two of the third insulating connectors are respectively arranged on the two outermost ones of the plurality of first gate lines along the first direction; at least two of the fourth insulating connectors are respectively arranged on the two outermost ones of the plurality of second gate lines along the first direction.

[0026] According to some embodiments of the present invention, the first edge interconnection structure and multiple first sub-interconnection structures are respectively welded to multiple second gate lines to achieve electrical connection; the second edge interconnection structure and multiple second sub-interconnection structures are respectively welded to multiple first gate lines to achieve electrical connection.

[0027] According to some embodiments of the present invention, at least one fifth connecting member is disposed on a side of the plurality of first sub-interconnection structures and the plurality of second sub-interconnection structures away from the plurality of first gate lines and the plurality of second gate lines.

[0028] According to some embodiments of the utility model, the width of the third insulating connector is w3, and the thickness of the third insulating connector is t1, wherein w3 and t1 respectively satisfy: 100μm≤w3≤700μm, 50μm≤t1≤180μm; the width of the fourth insulating connector is w4, and the thickness of the fourth insulating connector is t2, wherein w4 and t2 respectively satisfy: 100μm≤w4≤700μm, 50μm≤t2≤180μm.

[0029] According to some embodiments of the present invention, a first connection reinforcement member is provided between each of the first sub-interconnection structures and the plurality of the second gate lines; and / or a second connection reinforcement member is provided between each of the second sub-interconnection structures and the plurality of the first gate lines.

[0030] According to some embodiments of the present invention, the first connection reinforcement member is in the shape of a dot or a strip; and / or the second connection reinforcement member is in the shape of a dot or a strip.

[0031] According to some embodiments of the present invention, the first connecting reinforcement extends along a first direction or a second direction, and the first direction is perpendicular to the second direction; and / or the second connecting reinforcement extends along the first direction or the second direction, and the first direction is perpendicular to the second direction.

[0032] According to some embodiments of the present invention, the first connection reinforcement member and / or the second connection reinforcement member is a solder paste member.

[0033] The photovoltaic assembly according to the third aspect of the present invention comprises the battery cell according to the first aspect of the present invention, or the battery string according to the second aspect of the present invention.

[0034] The photovoltaic power generation system according to the fourth aspect of the utility model comprises the battery cell according to the first aspect of the utility model, or the battery string according to the second aspect of the utility model, or the photovoltaic module according to the third aspect of the utility model.

[0035] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0037] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the utility model, wherein the first grid line and the second grid line are respectively extended continuously;

[0038] Figure 2 is a schematic diagram of a battery cell according to another embodiment of the utility model, wherein the first grid line and the second grid line are respectively separated and disconnected;

[0039] Figure 3 is a schematic diagram of a battery string according to an embodiment of the utility model, wherein the first grid line and the second grid line are respectively extended continuously;

[0040] Figure 4 is a schematic diagram of a battery string according to another embodiment of the utility model, wherein the first grid line and the second grid line are respectively separated and disconnected;

[0041] Figure 5 is a schematic diagram of a battery string according to another embodiment of the utility model, wherein the first connection reinforcement member and the second connection reinforcement member are respectively in the shape of dots;

[0042] Figure 6 is a schematic diagram of a battery string according to another embodiment of the utility model, wherein the first connection reinforcement member and the second connection reinforcement member are respectively strip-shaped, and the first connection reinforcement member and the second connection reinforcement member extend along a first direction respectively;

[0043] Figure 7 It is a schematic diagram of a battery string according to another embodiment of the present utility model, wherein the first connection reinforcement member and the second connection reinforcement member are respectively strip-shaped, and the first connection reinforcement member and the second connection reinforcement member extend respectively along the second direction.

[0044] Reference numerals:

[0045] 100. Battery cell;

[0046] 1. silicon wafer body; 2. first gate line; 21. first disconnection; 3. second gate line; 31. second disconnection; 4. first edge gate line; 5. second edge gate line; 200. battery string; 201. interconnection structure; 2011. first interconnection structure; 2011a. first edge interconnection structure; 2011b. first sub-interconnection structure; 2012. second interconnection structure; 2012a. second edge interconnection structure; 2012b. second sub-interconnection structure; 202. first insulating connector; 203. second insulating connector; 204. third insulating connector; 205. fourth insulating connector; 206. first connection reinforcement; 207. second connection reinforcement. DETAILED DESCRIPTION

[0047] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1 and Figure 2 The battery cell 100 according to the first embodiment of the present invention is described, and the battery cell 100 can be used in a battery string 200. In the following description of the present application, the battery cell 100 used in the battery string 200 is taken as an example for detailed description.

[0048] like Figure 1 and Figure 2 As shown, the cell 100 according to the first embodiment of the utility model comprises a silicon wafer body 1, a plurality of first gate lines 2, a plurality of second gate lines 3, a first edge gate line 4 and a second edge gate line 5. In the description of the utility model, "plurality" means two or more.

[0049] Specifically, the first gate lines 2 and the second gate lines 3 are arranged on one side of the silicon wafer body 1 in the thickness direction, and the plurality of first gate lines 2 and the plurality of second gate lines 3 are arranged along a first direction (eg Figure 1 The first grid lines 2 and the second grid lines 3 are arranged alternately in a second direction (for example Figure 1 The first gate line 2 and the second gate line 3 have opposite polarities, and the first direction and the second direction are perpendicular.

[0050] For example, the first gate line 2 (such as Figure 1 The dark lines in the figure) and the second grid line 3 (such as Figure 1 The configuration of the first grid line 2 (light-colored lines in the figure) includes the following situations: First, the first grid line 2 is a positive grid line, and the second grid line 3 is a negative grid line. Second, the first grid line 2 is a negative grid line, and the second grid line 3 is a positive grid line. With such a configuration, the first grid line 2 and the second grid line 3 can collect and transmit photogenerated carriers to form a current, thereby realizing that the solar cell 100 converts solar energy into electrical energy.

[0051] Combination Figure 1The first edge grid line 4 extends along the first direction (i.e., the up-down direction), is connected to one end of the plurality of first grid lines 2 along the second direction (i.e., the left-right direction), and is spaced apart from one end of the plurality of second grid lines 3 along the second direction. The second edge grid line 5 is opposite to the first edge grid line 4 along the second direction, extends along the first direction, is connected to the other end of the plurality of second grid lines 3 along the second direction, and is spaced apart from the other end of the plurality of first grid lines 2 along the second direction.

[0052] For example, in Figure 1 In the example, the right ends of the plurality of first gate lines 2 are electrically connected to the first edge gate line 4, respectively, and the right ends of the plurality of second gate lines 3 are spaced apart from the first edge gate line 4. The left ends of the plurality of second gate lines 3 are electrically connected to the second edge gate line 5, respectively, and the left ends of the plurality of first gate lines 2 are spaced apart from the second edge gate line 5. The first edge gate line 4 and the second edge gate line 5 are perpendicular to the upper and lower ends of the silicon wafer body 1, respectively. With such a configuration, compared with the cell in the conventional technology, the cell 100 is not provided with a main gate line, thereby reducing the amount of slurry used for making the gate line of the cell 100, thereby reducing the production cost of the cell 100, simplifying the production steps of the cell 100, and improving the production efficiency of the cell 100. In addition, it also avoids the main gate line collecting current and transmitting it to the pad point through the secondary gate line (i.e., the first gate line 2 and the second gate line 3) for output, thereby reducing the resistance of the cell 100, thereby increasing the power of the cell 100, and improving the performance of the cell 100.

[0053] In addition, the first edge grid line 4 can collect the current of multiple first grid lines 2, and the second edge grid line 5 can collect the current of multiple second grid lines 3, so as to facilitate the current convergence and facilitate the use of the current. For example, when the end of the first grid line 2 close to the first edge grid line 4 is broken, the first grid line 2 connected to the first edge grid line 4 can be connected to the first edge grid line 4 to output the current. When the end of the second grid line 3 close to the second edge grid line 5 is broken, the second grid line 3 connected to the second edge grid line 5 can be connected to the second edge grid line 5 to output the current, thereby reducing the current loss of the battery cell 100, and then improving the reliability of the battery cell 100. In addition, the arrangement of the first grid line 2, the second grid line 3, the first edge grid line 4 and the second edge grid line 5 is reasonable and simple, so as to be more conducive to the use of the battery cell 100. Furthermore, by setting the right ends of the plurality of second gate lines 3 to be spaced apart from the first edge gate lines 4, and the left ends of the plurality of first gate lines 2 to be spaced apart from the second edge gate lines 5, the second gate lines 3 can be prevented from contacting the first edge gate lines 4, and the first gate lines 2 can be prevented from contacting the second edge gate lines 5, thereby preventing a short circuit. It should be noted that the cell 100 may be a back contact cell 100. However, it is not limited thereto.

[0054] According to the battery cell 100 of the utility model, the battery cell 100 adopts a busbar-free design, thereby avoiding the slurry loss of the busbar, thereby reducing the production cost of the battery cell 100, simplifying the production steps of the battery cell 100, and improving the production efficiency of the battery cell 100. In addition, when the end of the first grid line 2 close to the first edge grid line 4 or the end of the second grid line 3 close to the second edge grid line 5 is broken, the current of the part of the first grid line 2 or the upper part of the second grid line 3 connected thereto can be derived through the first edge grid line 4 or the second edge grid line 5, thereby reducing the current loss of the battery cell 100, thereby improving the reliability of the battery cell 100. In addition, the arrangement of the first edge grid line 4 and the second edge grid line 5 is reasonable and simple, which is more conducive to the use of the battery cell 100.

[0055] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 One end of the first edge gate line 4 is connected to one end of a first gate line 2 adjacent to one side edge of the silicon wafer body 1 in the first direction (i.e., the up-down direction) among the plurality of first gate lines 2, and the other end of the first edge gate line 4 extends along the first direction to one end of a first gate line 2 adjacent to another side edge of the silicon wafer body 1 among the plurality of first gate lines 2. For example, Figure 1 As shown, the upper end of the first edge gate line 4 is connected to the right end of the first gate line 2 adjacent to the upper edge of the silicon wafer body 1 among the plurality of first gate lines 2, and the lower end of the first edge gate line 4 exceeds the right end of the first gate line 2 adjacent to the lower edge of the silicon wafer body 1 among the plurality of first gate lines 2. Alternatively, as Figure 2 As shown, the first edge gate line 4 is located on the left side of the plurality of first gate lines 2. The lower end of the first edge gate line 4 is connected to the left end of the first gate line 2 adjacent to the lower edge of the silicon wafer body 1 among the plurality of first gate lines 2, and the upper end of the first edge gate line 4 exceeds the left end of the first gate line 2 adjacent to the upper edge of the silicon wafer body 1 among the plurality of first gate lines 2.

[0056] In this way, while ensuring that the first edge grid lines 4 and the plurality of first grid lines 2 are arranged reasonably, the occupied area of ​​the first edge grid lines 4 on the silicon wafer body 1 is also effectively increased, thereby increasing the utilization rate of the surface of the cell 100, and further increasing the photoelectric conversion efficiency of the cell 100. In addition, the visual effect of the cell 100 is improved, thereby improving the aesthetics of the cell 100. It should be noted that the arrangement of the plurality of first grid lines 2 and the first edge grid lines 4 is not limited to this, and can also be set according to actual usage.

[0057] According to other embodiments of the present invention, Figure 1 and Figure 2One end of the second edge gate line 5 is connected to one end of the second gate line 3 adjacent to the other side edge of the silicon wafer body 1 in the first direction among the plurality of second gate lines 3, and the other end of the second edge gate line 5 extends along the first direction to one end of the second gate line 3 beyond the one side edge of the plurality of second gate lines 3 adjacent to the silicon wafer body 1. For example, Figure 1 As shown, the lower end of the second edge gate line 5 is connected to the left end of the second gate line 3 adjacent to the lower edge of the silicon wafer body 1 among the plurality of second gate lines 3, and the upper end of the second edge gate line 5 exceeds the left end of the second gate line 3 adjacent to the upper edge of the silicon wafer body 1 among the plurality of second gate lines 3. Or, as Figure 2 As shown, the second edge gate line 5 is located on the right side of the multiple second gate lines 3, the upper end of the second edge gate line 5 is connected to the right end of the second gate line 3 among the multiple second gate lines 3 adjacent to the upper edge of the silicon wafer body 1, and the lower end of the second edge gate line 5 exceeds the right end of the second gate line 3 among the multiple second gate lines 3 adjacent to the lower edge of the silicon wafer body 1.

[0058] In this way, while ensuring that the second edge gate lines 5 and the plurality of second gate lines 3 are arranged reasonably, the area occupied by the second edge gate lines 5 on the silicon wafer body 1 is effectively increased, thereby increasing the utilization rate of the surface of the cell 100, and further increasing the photoelectric conversion efficiency of the cell 100. In addition, the visual effect of the cell 100 is improved, thereby improving the aesthetics of the cell 100. It should be noted that the arrangement of the plurality of second gate lines 3 and the second edge gate lines 5 is not limited to this, and can also be set according to actual usage.

[0059] According to some further embodiments of the present invention, referring to Figure 1 and Figure 2 , one end of the first edge gate line 4 is connected to one end of the first gate line 2 adjacent to one side edge of the silicon wafer body 1 in the first direction among the plurality of first gate lines 2, and the other end of the first edge gate line 4 extends along the first direction to one end of the first gate line 2 adjacent to the other side edge of the silicon wafer body 1 among the plurality of first gate lines 2. At the same time, one end of the second edge gate line 5 is connected to one end of the second gate line 3 adjacent to the other side edge of the silicon wafer body 1 in the plurality of second gate lines 3 in the first direction, and the other end of the second edge gate line 5 extends along the first direction to one end of the second gate line 3 adjacent to one side edge of the silicon wafer body 1 among the plurality of second gate lines 3. In this way, while ensuring that the first edge gate line 4, the plurality of first gate lines 2, the second edge gate line 5 and the plurality of first gate lines 2 are arranged reasonably, the occupied area of ​​the first edge gate line 4 and the second edge gate line 5 on the silicon wafer body 1 is also effectively increased, thereby increasing the utilization rate of the surface of the battery cell 100, and further increasing the photoelectric conversion efficiency of the battery cell 100. In addition, the layout of the first edge grid lines 4 , the plurality of first grid lines 2 , the second edge grid lines 5 and the plurality of first grid lines 2 is reasonable, which ensures the normal use of the battery cell 100 while reducing the amount of slurry used for the grid lines.

[0060] According to some embodiments of the present invention, referring to Figure 1 , a plurality of first grid lines 2 extend continuously along the second direction (ie, the left-right direction); and / or a plurality of second grid lines 3 extend continuously along the second direction. Figure 1 In the example of , the arrangement of the plurality of first grid lines 2 and the plurality of second grid lines 3 includes the following situations: first, the plurality of first grid lines 2 extend continuously along the second direction. Second, the plurality of second grid lines 3 extend continuously along the second direction. Third, the plurality of first grid lines 2 extend continuously along the second direction. At the same time, the plurality of second grid lines 3 extend continuously along the second direction. Thus, the plurality of first grid lines 2 and the plurality of second grid lines 3 are fully penetrated in the left-right direction, thereby maximizing the use of the surface of the battery cell 100, thereby improving the use efficiency of the battery cell 100. When the plurality of battery cells 100 are connected to form a battery string 200, the photoelectric conversion capacity of the battery string 200 is improved. Moreover, during the process of welding the plurality of battery cells 100 in the battery string 200, the current loss caused by the breakage of the first grid line 2 and the second grid line 3 can be reduced, thereby reducing the current loss of the battery string 200, improving the power generation of the battery string 200, and thereby improving the use reliability of the battery string 200.

[0061] According to some embodiments of the present invention, referring to Figure 2 , a plurality of first disconnected openings 21 are respectively formed on the plurality of first gate lines 2, and the plurality of first disconnected openings 21 are arranged at intervals along the second direction (i.e., the left-right direction), and the number of the plurality of first disconnected openings 21 of the plurality of first gate lines 2 is equal and they are respectively opposite to each other along the first direction (i.e., the up-down direction). A plurality of second disconnected openings 31 are respectively formed on the plurality of second gate lines 3, and the plurality of second disconnected openings 31 are arranged at intervals along the second direction, and the number of the plurality of second disconnected openings 31 of the plurality of second gate lines 3 is equal and they are respectively opposite to each other along the first direction, and the first disconnected openings 21 and the second disconnected openings 31 are arranged in a staggered manner.

[0062] For example, in Figure 2In the example, three first disconnection openings 21 are formed on the plurality of first grid lines 2, and the first disconnection openings 21 on each first grid line 2 are opposite in the up-down direction. Three second disconnection openings 31 are formed on the plurality of second grid lines 3, and the second disconnection openings 31 on each second grid line 3 are opposite in the up-down direction, and the plurality of first disconnection openings 21 and the plurality of second disconnection openings 31 are arranged in a staggered manner. In this way, the material consumption of the first grid lines 2 and the second grid lines 3 is reduced, thereby reducing the production cost of the first grid lines 2 and the second grid lines 3, and further reducing the production cost of the battery cell 100. In addition, compared with the design with a main grid line in the conventional technology, the current transmission distance of part of the first grid lines 2 and part of the second grid lines 3 is shortened, thereby reducing the electrical loss of the battery cell 100, thereby improving the utilization rate of the battery cell 100, and improving the photoelectric conversion capacity of the battery cell 100. In addition, when a plurality of battery cells 100 are electrically connected through the interconnection structure 201 (e.g., welding strip), when the first interconnection structure 2011 extends through the first disconnection opening 21, the first interconnection structure 2011 has no contact with the first gate line 2, thereby achieving insulation between the first interconnection structure 2011 and the first gate line 2, and reducing the use of the first insulating connector 202 to separate and insulate the first interconnection structure 2011 from the first gate line 2, further improving the reliability of the battery cell 100. When the second interconnection structure 2012 extends through the second disconnection opening 31, the second interconnection structure 2012 has no contact with the second gate line 3, thereby achieving insulation between the second interconnection structure 2012 and the second gate line 3, and reducing the use of the second insulating connector 203 to separate and insulate the second interconnection structure 2012 from the second gate line 3, further improving the reliability of the battery cell 100.

[0063] Optionally, refer to Figure 2 , the length of the first disconnection opening 21 in the second direction (i.e., the left-right direction) is L1, wherein L1 satisfies: 0.4mm≤L1≤1.6mm; and / or, the length of the second disconnection opening 31 in the second direction is L2, wherein L2 satisfies: 0.4mm≤L2≤1.6mm. For example, the settings of the first disconnection opening 21 and the second disconnection opening 31 include the following situations: First, the length of the first disconnection opening 21 in the second direction is L1, wherein L1 satisfies: 0.4mm≤L1≤1.6mm, and the length of the second disconnection opening 31 is not limited. Second, the length of the second disconnection opening 31 in the second direction is L2, wherein L2 satisfies: 0.4mm≤L2≤1.6mm, and the length of the first disconnection opening 21 is not limited. Third, the length of the first disconnection opening 21 in the second direction is L1, and the length of the second disconnection opening 31 in the second direction is L2, wherein L1 and L2 respectively satisfy: 0.4mm≤L1≤1.6mm, 0.4mm≤L2≤1.6mm.

[0064] When the length L1 of the first disconnection opening 21 is less than 0.4 mm, the length of the first disconnection opening 21 is small, so that when a plurality of battery cells 100 are electrically connected through the interconnection structure 201, the distance between the side of the first interconnection structure 2011 and the side of the first gate line 2 corresponding to the first disconnection opening 21 is small, and the first interconnection structure 2011 is easy to contact the first gate line 2, so that the battery string 200 is easy to short-circuit, which is not conducive to the normal use of the battery string 200. In addition, it also increases the difficulty of assembling the battery cell 100 and the first interconnection structure 2011, and reduces the assembly efficiency of the battery string 200. When the length L1 of the first disconnection opening 21 is greater than 1.6 mm, the length of the first disconnection opening 21 is large, shortening the length of the first gate line 2, reducing the occupied area of ​​the first gate line 2 on the silicon wafer body 1, thereby reducing the utilization of the surface of the battery cell 100, and further reducing the use efficiency of the battery cell 100.

[0065] When the length L2 of the second disconnection opening 31 is less than 0.4 mm, the length of the second disconnection opening 31 is small, so that when a plurality of battery cells 100 are electrically connected through the interconnection structure 201, the distance between the side of the second interconnection structure 2012 and the side of the second grid line 3 corresponding to the second disconnection opening 31 is small, and the second interconnection structure 2012 is easy to contact the second grid line 3, so that the battery string 200 is easy to short-circuit, which is not conducive to the normal use of the battery string 200. In addition, it also increases the difficulty of assembling the battery cell 100 and the second interconnection structure 2012, and reduces the assembly efficiency of the battery string 200. When the length L2 of the second disconnection opening 31 is greater than 1.6 mm, the length of the second disconnection opening 31 is large, shortening the length of the second grid line 3, reducing the area occupied by the second grid line 3 on the silicon wafer body 1, thereby reducing the utilization rate of the surface of the battery cell 100, and further reducing the use efficiency of the battery cell 100.

[0066] Thus, by setting the length L1 of the first disconnection opening 21 in the second direction and the length L2 of the second disconnection opening 31 in the second direction to respectively satisfy: 0.4mm≤L1≤1.6mm, 0.4mm≤L2≤1.6mm, the length of the first disconnection opening 21 and the length of the second disconnection opening 31 are reasonably set, so that when a plurality of battery cells 100 are electrically connected through the interconnection structure 201, a short circuit of the battery string 200 can be avoided, thereby extending the service life of the battery string 200. In addition, the material usage of the first grid line 2 and the second grid line 3 can be reduced while ensuring the occupied area of ​​the first grid line 2 and the second grid line 3, so as to be more conducive to the use of the battery cell 100. In addition, the difficulty of assembling the battery cell 100 and the interconnection structure 201 is reduced, and the assembly efficiency of the battery string 200 is improved.

[0067] According to some embodiments of the present invention, referring to Figure 1The distance between the first edge gate line 4 and the one end of the plurality of second gate lines 3 along the second direction (ie, the left-right direction) is a1, wherein a1 satisfies: 100um<a1<800um.

[0068] For example, in Figure 1 In the example, the distances between the ends of the plurality of second gate lines 3 away from the second edge gate line 5 (i.e., the above-mentioned one end) and the first edge gate line 4 along the left and right directions are respectively a1. When the distance a1 between the first edge gate line 4 and the above-mentioned one end of the plurality of second gate lines 3 along the second direction is less than or equal to 100um, the distance between the above-mentioned one end of the plurality of second gate lines 3 and the first edge gate line 4 is small, so that during the use of the battery cell 100, the plurality of second gate lines 3 and the first edge gate line 4 are easily affected by each other and short-circuited, which is not conducive to the normal use of the battery cell 100 for a long time. When the distance a1 between the first edge gate line 4 and the above-mentioned one end of the plurality of second gate lines 3 along the second direction is greater than or equal to 800um, the distance between the above-mentioned one end of the plurality of second gate lines 3 and the first edge gate line 4 is large, thereby reducing the occupied area of ​​the second gate lines 3 on the surface of the silicon wafer body 1, reducing the surface utilization rate of the silicon wafer body 1, and further reducing the photoelectric conversion capacity of the battery cell 100.

[0069] Thus, by setting the distance a1 between the first edge grid line 4 and the above-mentioned one end of the plurality of second grid lines 3 along the second direction to satisfy: 100um<a1<800um, the distance between the plurality of second grid lines 3 and the first edge grid line 4 is reasonably set, thereby avoiding the plurality of second grid lines 3 and the first edge grid line 4 from affecting each other and causing a short circuit during the use of the battery cell 100, thereby allowing the battery cell 100 to be used normally for a long time. In addition, while ensuring that the plurality of second grid lines 3 and the first edge grid lines 4 can avoid affecting each other and causing a short circuit, the occupied area of ​​the second grid lines 3 on the surface of the silicon chip body 1 is increased, the surface utilization rate of the silicon chip body 1 is improved, and the photoelectric conversion capacity of the battery cell 100 is improved.

[0070] According to other embodiments of the present invention, Figure 1 The distance between the second edge gate line 5 and the other ends of the plurality of first gate lines 2 along the second direction (ie, the left-right direction) is a2, wherein a2 satisfies: 100um<a2<800um.

[0071] For example, in Figure 1In the example, the distance between one end of the plurality of first gate lines 2 away from the first edge gate line 4 (i.e., the other end) and the second edge gate line 5 along the left and right directions is respectively a2. When the distance a2 between the second edge gate line 5 and the other end of the plurality of first gate lines 2 along the second direction is less than or equal to 100um, the distance between the other end of the plurality of first gate lines 2 and the second edge gate line 5 is small, so that during the use of the battery cell 100, the plurality of first gate lines 2 and the second edge gate line 5 are easily affected by each other and short-circuited, which is not conducive to the normal use of the battery cell 100 for a long time. When the distance a2 between the second edge gate line 5 and the other end of the plurality of first gate lines 2 along the second direction is greater than or equal to 800um, the distance between the other end of the plurality of first gate lines 2 and the second edge gate line 5 is large, thereby reducing the occupied area of ​​the first gate lines 2 on the surface of the silicon wafer body 1, reducing the surface utilization rate of the silicon wafer body 1, and further reducing the photoelectric conversion capacity of the battery cell 100.

[0072] Thus, by setting the distance a2 between the second edge gate line 5 and the other end of the plurality of first gate lines 2 along the second direction to satisfy: 100um<a2<800um, the distance between the plurality of first gate lines 2 and the second edge gate lines 5 is reasonably set, thereby avoiding the plurality of first gate lines 2 and the second edge gate lines 5 from affecting each other and causing a short circuit during the use of the battery cell 100, thereby allowing the battery cell 100 to be used normally for a long time. In addition, while ensuring that the plurality of first gate lines 2 and the second edge gate lines 5 can avoid affecting each other and causing a short circuit, the occupied area of ​​the first gate lines 2 on the surface of the silicon chip body 1 is increased, the surface utilization rate of the silicon chip body 1 is improved, and the photoelectric conversion capacity of the battery cell 100 is improved.

[0073] According to some embodiments of the present invention, referring to Figure 1 , the distance between the first edge gate line 4 and the one end of the plurality of second gate lines 3 along the second direction is a1, and the distance between the second edge gate line 5 and the other end of the plurality of first gate lines 2 along the second direction is a2, wherein a1 and a2 respectively satisfy: 100um<a1<800um, 100um<a2<800um. Thus, during the use of the battery cell 100, the plurality of second gate lines 3 and the first edge gate lines 4 are prevented from affecting each other and causing a short circuit, and the plurality of first gate lines 2 and the second edge gate lines 5 are prevented from affecting each other and causing a short circuit, so that the battery cell 100 can be used normally for a long time. In addition, while ensuring that a short circuit is avoided, the occupied area of ​​the first gate lines 2 and the second gate lines 3 on the surface of the silicon chip body 1 is increased, and the surface utilization rate of the silicon chip body 1 is further improved, thereby further improving the photoelectric conversion capacity of the battery cell 100.

[0074] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 , the width of the first edge grid line 4 is equal to that of the first grid line 2; and / or, the width of the second edge grid line 5 is equal to that of the second grid line 3. For example, the arrangement of the first edge grid line 4, the first grid line 2, the second edge grid line 5, and the second grid line 3 includes the following situations: First, only the width of the first edge grid line 4 is equal to that of the first grid line 2. Second, only the width of the second edge grid line 5 is equal to that of the second grid line 3. Third, the width of the first edge grid line 4 is equal to that of the first grid line 2. At the same time, the width of the second edge grid line 5 is equal to that of the second grid line 3. For example, in Figure 1 In the example, the width of the first grid line 2 in the vertical direction is the same as the width of the first edge grid line 4 in the horizontal direction, and the width of the second grid line 3 in the vertical direction is the same as the width of the second edge grid line 5 in the horizontal direction. Such an arrangement also simplifies the production of the battery cell 100, and there is no need to produce grid lines of different sizes, which reduces the difficulty of producing the battery cell 100, thereby improving the production efficiency of the battery cell 100.

[0075] According to some embodiments of the utility model, the first gate line 2 has a plurality of first electrical connection segments (not shown) arranged at intervals, the length of the first electrical connection segment along the second direction (i.e., the left-right direction) is L3, and the width of the first electrical connection segment along the first direction (i.e., the up-down direction) is w1, wherein L3 and w1 respectively satisfy: 0mm<L3≤1.5mm, 30μm≤w1≤80μm. For example, when the first electrical connection segment and the first gate line 2 are integrated, the first electrical connection segment is the thickened portion of the first gate line 2 along the second direction, and the first electrical connection segment can be used for welding with the second interconnection structure 2012 to increase the contact area between the first gate line 2 and the second interconnection structure 2012, thereby facilitating the electrical connection between the first gate line 2 and the second interconnection structure 2012, and making the connection firm.

[0076] When the length L3 of the first electrical connection segment is equal to 0, that is, the first gate line 2 does not contain the first electrical connection segment. When the length L3 of the first electrical connection segment is greater than 1.5 mm, the length of the first electrical connection segment is relatively large, which increases the material usage of the first electrical connection segment, thereby increasing the production cost of the battery cell 100. When the width w1 of the first electrical connection segment is less than 30 μm, the area of ​​the first electrical connection segment is relatively small, thereby reducing the contact area between the second interconnection structure 2012 and the first electrical connection segment, thereby weakening the connection strength between the first electrical connection segment and the second interconnection structure 2012, thereby reducing the reliability of the battery cell 100. When the width w1 of the first electrical connection segment is greater than 80 μm, the width of the first electrical connection segment is relatively large, thereby reducing the distance between the first electrical connection segment and the adjacent second gate line 3, thereby making the battery cell 100 prone to short circuit during use, and also increasing the amount of slurry (such as silver slurry) used.

[0077] Thus, by setting the length L3 of the first electrical connection section and the width w1 of the first electrical connection section to respectively satisfy: 0mm<L3≤1.5mm, 30μm≤w1≤80μm, the length of the first electrical connection section and the width of the first electrical connection section are reasonably set, and the contact area of ​​the electrical connection between the first electrical connection section and the second interconnection structure 2012 is increased, thereby improving the connection strength between the first electrical connection section and the second interconnection structure 2012, and further improving the reliability of the battery string 200. In addition, the material usage of the first electrical connection section is also reduced, thereby reducing the material usage of the battery cell 100, and further reducing the production cost of the battery cell 100.

[0078] According to some other embodiments of the utility model, the second gate line 3 has a plurality of second electrical connection segments (not shown) arranged at intervals, the length of the second electrical connection segment along the second direction is L4, and the width of the second electrical connection segment along the first direction is w2, wherein L4 and w2 respectively satisfy: 0mm<L4≤1.5mm, 30μm≤w2≤80μm. For example, when the second electrical connection segment and the second gate line 3 are integrated, the second electrical connection segment is the thickened portion of the second gate line 3 along the second direction, and the second electrical connection segment can be used for welding with the first interconnection structure 2011 to increase the contact area between the second gate line 3 and the first interconnection structure 2011, thereby facilitating the electrical connection between the second gate line 3 and the first interconnection structure 2011, and making the connection firm.

[0079] When the length L4 of the second electrical connection segment is equal to 0, that is, the second gate line 3 does not contain the second electrical connection segment. When the length L4 of the second electrical connection segment is greater than 1.5 mm, the length of the second electrical connection segment is relatively large, which increases the material usage of the second electrical connection segment, thereby increasing the production cost of the battery cell. When the width w2 of the second electrical connection segment is less than 30 μm, the area of ​​the second electrical connection segment is relatively small, thereby reducing the contact area between the first interconnection structure 2011 and the second electrical connection segment, thereby weakening the connection strength between the second electrical connection segment and the first interconnection structure 2011, thereby reducing the reliability of the battery cell 100. When the width w2 of the second electrical connection segment is greater than 80 μm, the width of the second electrical connection segment is relatively large, thereby shortening the distance between the second electrical connection segment and the adjacent first gate line 2, thereby making the battery cell 100 prone to short circuit during use, and also increasing the amount of slurry (such as silver slurry) used.

[0080] Thus, by setting the length L4 of the second electrical connection section 22 and the width w2 of the second electrical connection section 22 to respectively satisfy: 0mm<L4≤1.5mm, 30μm≤w2≤80μm, the length of the second electrical connection section and the width of the second electrical connection section are reasonably set, and the contact area of ​​the electrical connection between the second electrical connection section and the first interconnection structure 2011 is increased, thereby improving the connection strength between the second electrical connection section and the first interconnection structure 2011, and further improving the reliability of the battery string 200. In addition, the material consumption of the second electrical connection section is also reduced, thereby reducing the material consumption of the battery cell 100, and further reducing the production cost of the battery cell 100.

[0081] According to some further embodiments of the utility model, the first gate line 2 has a plurality of first electrical connection segments arranged at intervals, the length of the first electrical connection segment along the second direction is L3, the width of the first electrical connection segment along the first direction is w1, wherein L3 and w1 respectively satisfy: 0mm<L3≤1.5mm, 30μm≤w1≤80μm. Meanwhile, the second gate line 3 has a plurality of second electrical connection segments arranged at intervals, the length of the second electrical connection segment along the second direction is L4, the width of the second electrical connection segment along the first direction is w2, wherein L4 and w2 respectively satisfy: 0mm<L4≤1.5mm, 30μm≤w2≤80μm. Thus, by limiting the width of the first electrical connection section and the second electrical connection section in the first direction and the length in the second direction respectively, so as to make the area of ​​the first electrical connection section and the second electrical connection section reasonably set, the contact area between the first electrical connection section and the second interconnection structure 2012 is increased, and the contact area between the second electrical connection section and the first interconnection structure 2011 is also increased, thereby improving the connection strength between the first electrical connection section and the second interconnection structure 2012, and between the second electrical connection section and the first interconnection structure 2011, and improving the reliability of the battery string 200. In addition, the material usage of the first electrical connection section and the second electrical connection section is also rationalized, thereby reducing the production cost of the battery cell 100. In addition, the first electrical connection section is prevented from contacting the second grid line 3, and the second electrical connection section is prevented from contacting the first grid line 2, thereby preventing the battery cell 100 from short circuiting.

[0082] According to some embodiments of the present invention, referring to Figure 1 , the spacing between the first grid line 2 and the adjacent second grid line 3 is d1, where d1 satisfies: 0.4mm≤d1≤1mm. Figure 1In the example, the minimum spacing between the first gate line 2 and the adjacent second gate line 3 in the up-down direction is d1. When the spacing d1 between the first gate line 2 and the adjacent second gate line 3 is less than 0.4 mm, the spacing between the first gate line 2 and the second gate line 3 is small, so that during the use of the battery cell 100, the current on the first gate line 2 and the second gate line 3 are easily affected by each other to cause a short circuit, and the processing difficulty of the battery cell 100 is also increased. When the spacing d1 between the first gate line 2 and the adjacent second gate line 3 is greater than 1 mm, the spacing between the first gate line 2 and the second gate line 3 is large, which reduces the number of the first gate lines 2 and the second gate lines 3 on the silicon wafer body 1, thereby reducing the surface utilization rate of the battery cell 100, and also weakening the photoelectric conversion performance of the battery cell 100, thereby reducing the performance of the battery cell 100. Therefore, by setting the spacing d1 between the first gate line 2 and the adjacent second gate line 3 to satisfy: 0.4mm≤d1≤1mm, the distance between the first gate line 2 and the second gate line 3 is reasonably set, thereby avoiding the short circuit between the first gate line 2 and the second gate line 3, and reducing the processing difficulty of the battery cell 100. In addition, the number of arranged first gate lines and second gate lines 3 is rationalized, thereby improving the surface utilization rate of the silicon chip body 1, improving the photoelectric conversion capacity of the battery cell 100, and then improving the performance of the battery cell 100.

[0083] According to some embodiments of the present invention, referring to Figure 1 , the spacing between two adjacent first grid lines 2 is d2, where d2 satisfies: 0.8 mm ≤ d2 ≤ 2 mm. The spacing between two adjacent second grid lines 3 is d3, where d3 satisfies: 0.8 mm ≤ d3 ≤ 2 mm. For example, Figure 1 In the example, the minimum distance between two adjacent first gate lines 2 along the up-down direction is d2, and the minimum distance between two adjacent second gate lines 3 along the up-down direction is d3. When the spacing d2 between two adjacent first gate lines 2 is less than 0.8 mm, the spacing between two adjacent first gate lines 2 is small, which makes it inconvenient to set the first gate line 2 between two adjacent second gate lines 3, increasing the production difficulty of the battery cell 100. When the spacing d2 between two adjacent first gate lines 2 is greater than 2 mm, the spacing between two adjacent first gate lines 2 is large, which reduces the number of multiple first gate lines 2 arranged on the silicon wafer body 1, thereby reducing the surface area utilization rate of the battery cell 100. When the spacing d2 between two adjacent second gate lines 3 is less than 0.8 mm, the spacing between two adjacent second gate lines 3 is small, which makes it inconvenient to set the first gate line 2 between two adjacent second gate lines 3, increasing the production difficulty of the battery cell 100. When the interval d2 between two adjacent second gate lines 3 is greater than 2 mm, the interval between two adjacent second gate lines 3 is relatively large, which reduces the number of second gate lines 3 arranged on the silicon wafer body 1, thereby reducing the area utilization of the battery cell 100.

[0084] Thus, by setting the spacing d2 between two adjacent first gate lines 2 and the spacing d3 between two adjacent second gate lines 3 to respectively satisfy: 0.8 mm ≤ d2 ≤ 2 mm, 0.8 mm ≤ d3 ≤ 2 mm, the spacing between two adjacent first gate lines 2 and the spacing between two adjacent second gate lines 3 are reasonably set, which reduces the production difficulty of the battery cell 100, thereby improving the production efficiency of the battery cell 100. In addition, the number of arrangement of the plurality of first gate lines 2 and the plurality of second gate lines 3 is rationalized, thereby improving the surface utilization rate of the silicon wafer body 1, improving the photoelectric conversion capacity of the battery cell 100, and thus improving the use performance of the battery cell 100.

[0085] According to the battery string 200 of the second embodiment of the utility model, refer to Figure 3 and Figure 4 , including a plurality of battery cells 100 and a plurality of interconnection structures 201 , the battery cell 100 is the battery cell 100 according to the first aspect of the utility model, and two adjacent battery cells 100 are electrically connected via the plurality of interconnection structures 201 .

[0086] For example, in Figure 3 and Figure 4 In the example, a plurality of battery cells 100 are arranged at intervals in the up-down direction, the interconnection structure 201 extends in the up-down direction, and the plurality of interconnection structures 201 are arranged at intervals in the left-right direction, and the same interconnection structure 201 electrically connects two adjacent battery cells 100, and each interconnection structure 201 is electrically connected to a plurality of first grid lines 2 of the same polarity or to a plurality of second grid lines 3 of the same polarity. In this way, the current on the plurality of first grid lines 2 is collected by a corresponding part of the interconnection structure 201, and the current on the plurality of second grid lines 3 is collected by another corresponding part of the interconnection structure 201, thereby improving the current collection capacity of the battery string 200. For example, the interconnection structure 201 can be a welding strip.

[0087] Further, refer to Figure 3 The plurality of interconnection structures 201 include a plurality of first interconnection structures 2011 and a plurality of second interconnection structures 2012 .

[0088] Specifically, a plurality of first interconnecting structures 2011 are arranged at intervals along the second direction (i.e., the left-right direction), each of the first interconnecting structures 2011 is separated from the plurality of first gate lines 2, and each of the first interconnecting structures 2011 is electrically connected to the plurality of second gate lines 3. A plurality of second interconnecting structures 2012 and the plurality of first interconnecting structures 2011 are arranged alternately along the second direction, each of the second interconnecting structures 2012 is separated from the plurality of second gate lines 3, and each of the second interconnecting structures 2012 is electrically connected to the plurality of first gate lines 2.

[0089] For example, in Figure 3 In the example of FIG. 1 , on the same battery cell 100, a plurality of first interconnecting structures 2011 and a plurality of second interconnecting structures 2012 are alternately arranged in the left-right direction, each first interconnecting structure 2011 is electrically connected to a plurality of second grid lines 3, and each second interconnecting structure 2012 is electrically connected to a plurality of first grid lines 2. In this way, the first interconnecting structure 2011 can converge the current on the plurality of second grid lines 3, and the second interconnecting structure 2012 can converge the current on the plurality of first grid lines 2, so that the current on the first grid lines 2 and the second grid lines 3 can be respectively derived through the first interconnecting structure 2011 and the second interconnecting structure 2012, so that the battery string 200 can be used normally for a long time. In addition, by setting each first interconnection structure 2011 to be separated from the multiple first gate lines 2, and each second interconnection structure 2012 to be separated from the multiple second gate lines 3, the insulated connection between the first interconnection structure 2011 and the multiple first gate lines 2 can be achieved, and the insulated connection between the second interconnection structure 2012 and the multiple second gate lines 3 can be achieved, thereby ensuring the normal use of the battery cell 100 and the battery string 200.

[0090] According to some embodiments of the present invention, referring to Figure 3 , multiple first gate lines 2 extend continuously along the second direction (i.e., the left-right direction), each first interconnection structure 2011 is separated from the multiple first gate lines 2 by multiple first insulating connectors 202, and the multiple first insulating connectors 202 are respectively connected between the first interconnection structure 2011 and the multiple first gate lines 2.

[0091] For example, in Figure 3 In the example, the first insulating connector 202 is located at the overlap of the first interconnection structure 2011 and the first gate line 2, and multiple first insulating connectors 202 are arranged with the second gate line 3 in the up-down direction, and multiple first insulating connectors 202 are arranged with the second interconnection structure 2012 in the left-right direction. Thus, the first insulating connector 202 has an insulating effect, and each first gate line 2 is provided with a first insulating connector 202, which can insulate the first interconnection structure 2011 from the first gate line 2, thereby avoiding electrical connection between the first interconnection structure 2011 and the first gate line 2, thereby avoiding short circuit, and the battery string 200 has no short circuit risk, thereby ensuring the current transmission performance and production yield of the battery string 200. In addition, the first insulating connector 202 also has a bonding effect, which can bond the first interconnection structure 2011 and the first gate line 2 to prevent the first interconnection structure 2011 from falling off the battery cell 100, thereby improving the stability of the electrical connection between the first interconnection structure 2011 and the second gate line 3, and further facilitating the normal use of the battery string 200 for a long time.

[0092] According to other embodiments of the present invention, Figure 3 , multiple second gate lines 3 extend continuously along the second direction, each second interconnection structure 2012 is separated from the multiple second gate lines 3 by multiple second insulating connectors 203, and the multiple second insulating connectors 203 are respectively connected between the second interconnection structure 2012 and the multiple second gate lines 3.

[0093] For example, in Figure 3 In the example, the second insulating connector 203 is located at the overlap of the second interconnection structure 2012 and the second gate line 3, and multiple second insulating connectors 203 are arranged at intervals of the first gate line 2 in the up-down direction, and multiple second insulating connectors 203 are arranged at intervals of the first interconnection structure 2011 in the left-right direction. Thus, the second insulating connector 203 has an insulating effect, and each second gate line 3 is provided with a second insulating connector 203, which can insulate the second interconnection structure 2012 from the second gate line 3, thereby avoiding electrical connection between the second interconnection structure 2012 and the second gate line 3, thereby avoiding short circuit, and there is no short circuit risk during the production process of the battery string 200, thereby ensuring the current transmission performance and production yield of the battery string 200. In addition, the second insulating connector 203 also has a bonding function, which can bond the second interconnection structure 2012 and the second gate line 3 to prevent the second interconnection structure 2012 from falling off the battery cell 100, thereby improving the stability of the electrical connection between the second interconnection structure 2012 and the second gate line 3, and further facilitating the normal use of the battery string 200 for a long time.

[0094] According to some further embodiments of the present invention, referring to Figure 3 , a plurality of first gate lines 2 extend continuously along the second direction, each first interconnection structure 2011 is separated from the plurality of first gate lines 2 by a plurality of first insulating connectors 202, and the plurality of first insulating connectors 202 are respectively connected between the first interconnection structure 2011 and the plurality of first gate lines 2. At the same time, a plurality of second gate lines 3 extend continuously along the second direction, each second interconnection structure 2012 is separated from the plurality of second gate lines 3 by a plurality of second insulating connectors 203, and the plurality of second insulating connectors 203 are respectively connected between the second interconnection structure 2012 and the plurality of second gate lines 3.

[0095] With such arrangement, the first insulating connector 202 and the second insulating connector 203 have an insulating effect, and can insulate the first interconnecting structure 2011 from the first gate line 2, and can also insulate the second interconnecting structure 2012 from the second gate line 3, thereby avoiding electrical connection between the first interconnecting structure 2011 and the first gate line 2, and also avoiding electrical connection between the second interconnecting structure 2012 and the second gate line 3, thereby avoiding short circuit, and ensuring the current transmission performance and production yield of the battery string 200. In addition, the first insulating connector 202 and the second insulating connector 203 also have a bonding function, and can bond the first interconnecting structure 2011 and the first gate line 2. The second insulating connector 203 also has a bonding function, and can bond the second interconnecting structure 2012 and the second gate line 3, thereby preventing the first interconnecting structure 2011 from falling off the battery cell 100, preventing the second interconnecting structure 2012 from falling off the battery cell 100, improving the stability of the electrical connection between the first interconnecting structure 2011 and the second gate line 3, and improving the stability of the electrical connection between the second interconnecting structure 2012 and the second gate line 3, thereby facilitating the normal use of the battery string 200 for a long time.

[0096] According to some embodiments of the utility model, the first insulating connector 202 is an insulating glue; and / or, the second insulating connector 203 is an insulating glue. For example, the configuration of the first insulating connector 202 and the second insulating connector 203 includes the following situations: only the first insulating connector 202 is an insulating glue. Second, only the second insulating connector 203 is an insulating glue. Third, both the first insulating connector 202 and the second insulating connector 203 are insulating glue. The characteristics of the insulating glue are good conformability and integrity, rapid solidification, good integrity, small shrinkage, no deformation, and high dielectric properties and moisture resistance and thermal conductivity, so that the first insulating connector 202 and the second insulating connector 203 have good insulation effect, thereby effectively avoiding short circuit of the battery string 200. Moreover, it is easy to use.

[0097] According to some embodiments of the present invention, referring to Figure 4 The first interconnection structure 2011 includes a first edge interconnection structure 2011a and a plurality of first sub-interconnection structures 2011b, the first edge interconnection structure 2011a is located on one side of the plurality of first sub-interconnection structures 2011b adjacent to the second edge gate lines 5, the plurality of first gate lines 2 are continuous at a position opposite to the first edge interconnection structure 2011a, and the plurality of first gate lines 2 are disconnected at a position opposite to the first sub-interconnection structure 2011b. Figure 4In the example, the first edge interconnection structure 2011a is insulated and connected to one end of multiple first gate lines 2 close to the second edge gate line 5, and the multiple first gate lines 2 extend continuously at a position opposite to the first edge interconnection structure 2011a, and each first sub-interconnection structure 2011b is located at the corresponding multiple first disconnection openings 21 on the multiple first gate lines 2.

[0098] Such arrangement, on the one hand, enhances the stability of the connection between the first edge interconnection structure 2011a and the plurality of first grid lines 2, which is beneficial to the long-term use of the battery string 200. On the other hand, by arranging the plurality of first grid lines 2 to be continuous at a position opposite to the first edge interconnection structure 2011a, the current collected by the plurality of first grid lines 2 insulated from the first edge interconnection structure 2011a can be converged through the second sub-interconnection structure 2012b adjacent to the first edge interconnection structure 2011a, without adding other current collection grid lines, which is beneficial to the current collection of the portion of the first grid lines 2 on one side close to the second edge grid line 5, and can also reduce the current loss, which is more beneficial to the use of the battery cell 100.

[0099] Combination Figure 4 The second interconnect structure 2012 includes a second edge interconnect structure 2012a and a plurality of second sub-interconnect structures 2012b, the second edge interconnect structure 2012a is located on one side of the plurality of second sub-interconnect structures 2012b adjacent to the first edge gate lines 4, the plurality of second gate lines 3 are continuous at a position opposite to the second edge interconnect structure 2012a, and the plurality of second gate lines 3 are disconnected at a position opposite to the second sub-interconnect structure 2012b. Figure 4 In the example of , the second edge interconnection structure 2012a is insulated and connected to one end of the plurality of second gate lines 3 close to the first edge gate line 4, the plurality of second gate lines 3 are continuously extended at a position opposite to the second edge interconnection structure 2012a, and each second sub-interconnection structure 2012b is located at the corresponding plurality of second disconnection openings 31 on the plurality of second gate lines 3. In this way, on the one hand, the stability of the connection between the second edge interconnection structure 2012a and the plurality of second gate lines 3 is enhanced, which is conducive to the long-term use of the battery string 200. On the other hand, by setting the plurality of second gate lines 3 to be continuous at a position opposite to the second edge interconnection structure 2012a, the current collected by the plurality of second gate lines 3 insulated and connected to the second edge interconnection structure 2012a can be converged through the first sub-interconnection structure 2011b adjacent to the second edge interconnection structure 2012a, without the need to add other current collection gate lines, which is conducive to the current collection of the portion of the side of the plurality of second gate lines 3 close to the second edge gate line 5, and can also reduce the loss of current, which is more conducive to the use of the battery cell 100.

[0100] According to some embodiments of the present invention, referring to Figure 4 , a third insulating connector 204 is provided at a position where the plurality of first gate lines 2 are opposite to the plurality of first interconnection structures 2011, a third insulating connector 204 is provided at a position where the first edge interconnection structure 2011a is opposite to the plurality of first gate lines 2, and the plurality of third insulating connectors 204 are respectively connected between the first edge interconnection structure 2011a and the plurality of first gate lines 2. For example, Figure 4 In the example, the third insulating connector 204 is located at the overlap of the first interconnection structure 2011 and the first gate line 2, and multiple third insulating connectors 204 are arranged at intervals of the second interconnection structure 2012 in the left and right directions, and the first edge interconnection structure 2011a is provided with a third insulating connector 204 at the position corresponding to the separation of the multiple first gate lines 2, and multiple third insulating connectors 204 are arranged continuously at intervals of the second gate line 3 in the up and down directions. That is, each first gate line 2 is provided with a third insulating connector 204 at the relative position of the first edge interconnection structure 2011a. It should be noted that the number of the third insulating connectors 204 between each first sub-interconnection structure 2011b and the first gate line 2 is not specifically limited. For example, each first sub-interconnection structure 2011b is provided with a third insulating connector 204 between the multiple first gate lines 2, or the number of the third insulating connectors 204 between each first sub-interconnection structure 2011b and the multiple first gate lines 2 is less than the number of the first gate lines 2.

[0101] Thus, the third insulating connector 204 has an insulating effect, and can insulate the first interconnection structure 2011 and the first grid line 2, thereby avoiding the first interconnection structure 2011 and the first grid line 2 from being electrically connected, thereby avoiding the occurrence of a short circuit, and ensuring the normal use of the battery string 200. In addition, the third insulating connector 204 also has a bonding effect, and can bond the first interconnection structure 2011 and the first grid line 2 to avoid the first interconnection structure 2011 from falling off the battery cell 100, thereby improving the stability of the electrical connection between the first interconnection structure 2011 and the second grid line 3, thereby facilitating the normal use of the battery string 200 for a long time. It should be noted that during the installation of the first interconnection structure 2011 and the battery cell 100, the third insulating connector 204 can be applied to the corresponding position on the first grid line 2 first, and the first interconnection structure 2011 and the first grid line 2 are insulated and connected, and then the first interconnection structure 2011 and the second grid line 3 are welded by welding.

[0102] Combination Figure 4, a fourth insulating connector 205 is provided at a position where the plurality of second gate lines 3 are opposite to the second interconnection structure 2012, a fourth insulating connector 205 is provided at a position where the second edge interconnection structure 201 is opposite to the plurality of second gate lines 3, and the plurality of fourth insulating connectors 205 are respectively connected between the first edge interconnection structure 2011a and the plurality of second gate lines 3. For example, Figure 4 In the example, the fourth insulating connector 205 is located at the overlap of the second interconnection structure 2012 and the second gate line 3, and the fourth insulating connectors 205 are arranged at intervals of the first interconnection structure 2011 in the left-right direction, and the fourth insulating connector 205 is provided at the position where the second edge interconnection structure 2012a is spaced apart from the plurality of second gate lines 3, and the plurality of fourth insulating connectors 205 are arranged continuously at intervals of the first gate line 2 in the up-down direction. That is, the fourth insulating connector 205 is provided at the relative position of each second gate line 3 and the second edge interconnection structure 2012a. It should be noted that the number of the fourth insulating connectors 205 between each second sub-interconnection structure 2012b and the second gate line 3 is not specifically limited. For example, the fourth insulating connector 205 is provided between each second sub-interconnection structure 2012b and the plurality of second gate lines 3, or the number of the fourth insulating connectors 205 between each second sub-interconnection structure 2012b and the plurality of second gate lines 3 is less than the number of the second gate lines 3.

[0103] Thus, the fourth insulating connector 205 has an insulating effect, and the second interconnection structure 2012 and the second grid line 3 can be insulated, thereby avoiding the second interconnection structure 2012 and the second grid line 3 from being electrically connected, thereby avoiding the occurrence of a short circuit, and ensuring the normal use of the battery string 200. In addition, the fourth insulating connector 205 also has a bonding effect, and the second interconnection structure 2012 and the second grid line 3 can be bonded to avoid the second interconnection structure 2012 from falling off the battery cell 100, thereby improving the stability of the electrical connection between the second interconnection structure 2012 and the first grid line 2, thereby facilitating the normal use of the battery string 200 for a long time. It should be noted that during the installation of the second interconnection structure 2012 and the battery cell 100, the fourth insulating connector 205 can be applied to the corresponding position on the second grid line 3 first, the second interconnection structure 2012 and the second grid line 3 are insulated and connected, and then the second interconnection structure 2012 and the first grid line 2 are welded by welding.

[0104] According to some embodiments of the present invention, referring to Figure 4 At least two third insulating connectors 204 are provided between each first interconnection sub-structure 2011b and a plurality of first gate lines 2, and the third insulating connectors 204 are located at the disconnection point between the first gate line 2 and the first interconnection sub-structure 2011b. Figure 4In the example, the disconnection point between the first grid line 2 and the first sub-interconnection structure 201 is the first disconnection port 21, that is, the third insulating connector 204 is located at the first disconnection port 21. The number of the third insulating connectors 204 between each first sub-interconnection structure 2011b and a plurality of first grid lines 2 is at least two. In this way, the insulation and connection strength of the first sub-interconnection structure 2011b and the first grid line 2 are guaranteed, so as to facilitate the normal use of the battery string 200 for a long time. In addition, when the number of the third insulating connectors 204 is less than the number of the first disconnection ports 21, the number of the third insulating connectors 204 is reduced, thereby reducing the material consumption of the third insulating connectors 204, thereby further reducing the production cost of the battery string 200. It should be noted that, during the installation of the first interconnection structure 2011 and the battery cell 100, the third insulating connector 204 can be first applied to the first grid line 2 corresponding to the first edge interconnection structure 2011a, and then the third insulating connector 204 can be applied to the first disconnection opening 21 of the first grid line 2 corresponding to the first sub-interconnection structure 2011b, and then the first interconnection structure 2011 and the second grid line 3 are welded by welding. In this way, the relative movement of the battery cell 100 in the production of the battery string 200 is avoided to cause the interconnection structure 201 to be disengaged, thereby reducing the requirements for welding and facilitating welding. But it is not limited to this.

[0105] Combination Figure 4 At least two fourth insulating connectors 205 are provided between each second interconnection structure 2012b and a plurality of second gate lines 3, and the fourth insulating connectors 205 are located at the disconnection point between the second gate lines 3 and the second interconnection structure 2012b. Figure 4In the example, the disconnection point between the second grid line 3 and the second sub-interconnection structure 2012b is the second disconnection port 31, that is, the fourth insulating connector 205 is located at the second disconnection port 31. The number of the fourth insulating connectors 205 between each second sub-interconnection structure 2012b and a plurality of second grid lines 3 is at least two. In this way, the insulation and connection strength of the second sub-interconnection structure 2012b and the second grid line 3 are guaranteed, so as to facilitate the normal use of the battery string 200 for a long time. In addition, when the number of the fourth insulating connectors 205 is less than the number of the second disconnection ports 31, the number of the fourth insulating connectors 205 is also reduced, thereby reducing the material consumption of the fourth insulating connectors 205, thereby further reducing the production cost of the battery string 200. It should be noted that, during the installation of the second interconnection structure 2012 and the battery cell 100, the fourth insulating connector 205 can be first applied to the second disconnection opening 31 of the second grid line 3 corresponding to the second edge interconnection structure 2012a, and then the fourth insulating connector 205 can be applied to the second grid line 3 corresponding to the second sub-interconnection structure 2012b, and then the second interconnection structure 2012 and the first grid line 2 are welded by welding. Thus, the relative movement of the battery cell 100 in the production of the battery string 200 is avoided to cause the interconnection structure 201 to be disengaged, thereby reducing the requirements for welding and facilitating welding. But it is not limited to this.

[0106] Further, at least two third insulating connectors 204 are respectively arranged on the two outermost sides of the plurality of first gate lines 2 along the first direction (i.e., the up-down direction). At least two fourth insulating connectors 205 are respectively arranged on the two outermost sides of the plurality of second gate lines 3 along the first direction. That is to say, at least two third insulating connectors 204 are respectively arranged at the corresponding positions of the first gate lines 2 on the uppermost and lowermost sides of the plurality of first gate lines 2, and at least two fourth insulating connectors 205 are respectively arranged at the corresponding positions of the uppermost and lowermost sides of the plurality of second gate lines 3. In this way, when the number of the third insulating connectors 204 and the fourth insulating connectors 205 is reduced, the connection stability of the first gate line 2 and the first sub-interconnection structure 2011b is further improved, and the connection stability of the second gate line 3 and the second sub-interconnection structure 2012b is further improved, so as to ensure the use stability of the battery string 200. In addition, the setting positions of the third insulating connector 204 and the fourth insulating connector 205 are convenient for smearing, thereby reducing the production difficulty of the battery string 200 and improving the production efficiency of the battery string 200.

[0107] According to some embodiments of the utility model, the first edge interconnection structure 2011a and the plurality of first sub-interconnection structures 2011b are respectively welded with the plurality of second grid lines 3 to achieve electrical connection. The second edge interconnection structure 2012a and the plurality of second sub-interconnection structures 2012b are respectively welded with the plurality of first grid lines 2 to achieve electrical connection. Thus, by welding, the first edge interconnection structure 2011a and the plurality of first sub-interconnection structures 2011b are respectively fastened to the plurality of second grid lines 3, and the second edge interconnection structure 2012a and the plurality of second sub-interconnection structures 2012b are respectively fastened to the plurality of first grid lines 2, thereby avoiding the first interconnection structure 2011 and the second interconnection structure 2012 from falling off the battery cell 100, thereby improving the use stability of the battery string 200. In addition, the welding method is simple, thereby improving the production efficiency of the battery cell 100. In addition, the interconnection structure 201 is welded to the corresponding plurality of first grid lines 2 and plurality of second grid lines 3 by welding, so that the welding stress distribution is more uniform, the warping of the welding string is reduced, and the risk of hidden cracks in the battery string 200 is reduced.

[0108] According to some embodiments of the utility model, at least one fifth connector (not shown) is provided on one side of the plurality of first sub-interconnection structures 2011b and the plurality of second sub-interconnection structures 2012b away from the plurality of first gate lines 2 and the plurality of second gate lines 3. For example, first, the first edge interconnection structure 2011a is bonded to the plurality of first gate lines 2 through the third insulating connector 204, and the second edge interconnection structure 2012a is bonded to the plurality of second gate lines 3 through the third insulating connector 204. Secondly, in the process of installing the plurality of first sub-interconnection structures 2011b and the plurality of second sub-interconnection structures 2012b with the battery cell 100, the plurality of first sub-interconnection structures 2011b can be respectively welded to the plurality of second gate lines 3, and the plurality of second sub-interconnection structures 2012b can be respectively welded to the plurality of first gate lines 2. Then, the fifth connector is applied on one side of the plurality of first sub-interconnection structures 2011b and the plurality of second sub-interconnection structures 2012b away from the plurality of first gate lines 2 and the plurality of second gate lines 3. That is, firstly, a plurality of first interconnection sub-structures 2011b and a plurality of second interconnection sub-structures 2012b are welded and fixed on the battery cell 100, and then the fifth connection member is applied to strengthen the connection. Such arrangement reduces the requirement of applying the fifth connection member, and also avoids the situation that poor welding or poor overlap between the interconnection structure 201 and the corresponding first grid line 2 and the second grid line 3 due to the influence of the fifth connection member, thereby extending the service life of the battery string 200 and improving the performance of the battery string 200.

[0109] It should be noted that the fifth connector can be a glue point, a glue strip or a glue film. For example, directly on the side of the multiple first sub-interconnection structural members 2011b and the multiple second sub-interconnection structural members 2012b away from the multiple first grid lines 2 and the multiple second grid lines 3, glue is printed along the extension direction of the first sub-interconnection structural member 2011b and the extension direction of the multiple second sub-interconnection structural members 2012b. Alternatively, glue is applied to the partial position of the first sub-interconnection structural member 2011b and the partial position of the second sub-interconnection structural member 2012b in the up and down direction, and the glue is roughly in the shape of a strip. Alternatively, along the extension direction of the first sub-interconnection structural member 2011b and the extension direction of the second sub-interconnection structural member 2012b, glue is applied to the side of the multiple first sub-interconnection structural members 2011b and the multiple second sub-interconnection structural members 2012b away from the multiple first grid lines 2 and the multiple second grid lines 3 as a whole. Thus, when the fifth connector is a glue point, the material used for the fifth connector is less, thereby reducing the production cost of the battery string 200. When the fifth connection member is a rubber strip, the fifth connection member effectively controls the amount of rubber material used, has a reasonable design, and can also firmly bond the first sub-interconnection structure 2011b and the plurality of second sub-interconnection structures 2012b to the silicon wafer body 1. When the fifth connection member is a rubber film, it is easy to apply, shortens the application time, and thus improves the production efficiency of the battery string 200. But not limited thereto.

[0110] According to some embodiments of the present invention, referring to Figure 4 , the width of the third insulating connector 204 is w3, and the thickness of the third insulating connector 204 is t1, wherein w3 and t1 respectively satisfy: 100μm≤w3≤700μm, 50μm≤t1≤180μm. For example, when the width w3 of the third insulating connector 204 is less than 100μm, the width of the third insulating connector 204 is small, so that the area covered by the third insulating connector 204 on the first gate line 2 is small, and even the third insulating connector 204 cannot cover the first gate line 2, so that the first interconnection structure 2011 and the first gate line 2 are prone to short circuit, which is not conducive to the normal use of the battery string 200. When the width w3 of the third insulating connector 204 is greater than 700μm, the width of the third insulating connector 204 is large, and the third insulating connector 204 is easy to cover the adjacent second gate line 3 and contact the adjacent second gate line 3, thereby reducing the electrical connection effect between the first interconnection structure 2011 and the second gate line 3. In addition, the material usage of the third insulating connector 204 is also increased, thereby increasing the production cost of the battery string 200 .

[0111] When the thickness t1 of the third insulating connector 204 is less than 50 μm, the thickness of the third insulating connector 204 is small, thereby weakening the insulation and connection effects of the third insulating connector 204, and reducing the use stability of the battery string 200. When the thickness t1 of the third insulating connector 204 is greater than 180 μm, the thickness of the third insulating connector 204 is large, increasing the distance between the first interconnection structure 2011 and the second grid line 3, thereby reducing the electrical connection stability between the first interconnection structure 2011 and the second grid line 3. In addition, the material usage of the third insulating connector 204 is also increased, thereby increasing the production cost of the battery string 200.

[0112] Thus, by setting the width w3 of the third insulating connector 204 and the thickness t1 of the third insulating connector 204 to respectively satisfy: 100 μm ≤ w3 ≤ 700 μm, 50 μm ≤ t1 ≤ 180 μm, the width and thickness of the third insulating connector 204 are reasonably set, thereby improving the insulation effect of the third insulating connector 204 on the first interconnection structure 2011 and the first gate line 2, avoiding short circuit, and avoiding the influence on the electrical connection between the first interconnection structure 2011 and the second gate line 3, so that the battery string 200 can be used normally for a long time. In addition, the material consumption of the third insulating connector 204 is also reduced, thereby reducing the production cost of the battery string 200.

[0113] Combination Figure 4 , the width of the fourth insulating connector 205 is w4, and the thickness of the fourth insulating connector 205 is t2, wherein w4 and t2 respectively satisfy: 100μm≤w4≤00μm, 50μm≤t2≤180μm. When the width w4 of the fourth insulating connector 205 is less than 100μm, the width of the fourth insulating connector 205 is small, so that the area covered by the fourth insulating connector 205 on the second gate line 3 is small, and even the fourth insulating connector 205 cannot cover the second gate line 3, so that the second interconnection structure 2012 and the second gate line 3 are prone to short circuit, which is not conducive to the normal use of the battery string 200. When the width w4 of the fourth insulating connector 205 is greater than 700μm, the width of the fourth insulating connector 205 is large, and the fourth insulating connector 205 is easy to cover the adjacent first gate line 2 and contact the adjacent first gate line 2, thereby reducing the electrical connection effect between the second interconnection structure 2012 and the first gate line 2. In addition, the material usage of the fourth insulating connector 205 is also increased, thereby increasing the production cost of the battery string 200 .

[0114] When the thickness t2 of the fourth insulating connector 205 is less than 50 μm, the thickness of the fourth insulating connector 205 is small, thereby weakening the insulation and connection effects of the fourth insulating connector 205, and reducing the use stability of the battery string 200. When the thickness t2 of the fourth insulating connector 205 is greater than 180 μm, the thickness of the fourth insulating connector 205 is large, increasing the distance between the second interconnection structure 2012 and the first gate line 2, thereby reducing the electrical connection stability between the second interconnection structure 2012 and the first gate line 2. In addition, the material usage of the fourth insulating connector 205 is also increased, thereby increasing the production cost of the battery string 200.

[0115] Thus, by setting the width w4 of the fourth insulating connector 205 and the thickness t2 of the fourth insulating connector 205 to respectively satisfy: 100μm≤w4≤700μm, 50μm≤t2≤180μm, the width and thickness of the fourth insulating connector 205 are reasonably set, thereby improving the insulation effect of the fourth insulating connector 205 on the second interconnection structure 2012 and the second gate line 3, avoiding short circuit, and also avoiding the influence on the electrical connection between the second interconnection structure 2012 and the first gate line 2, so that the battery string 200 can be used normally for a long time. In addition, the material consumption of the fourth insulating connector 205 is also reduced, thereby reducing the production cost of the battery string 200. It should be noted that the uniformity of the height of the plurality of third insulating connectors 204 and the height of the plurality of fourth insulating connectors 205 is within ±40μm.

[0116] According to some embodiments of the present invention, referring to Figure 5 A first connection reinforcement member 206 is provided between each first sub-interconnection structure 201 and the plurality of second gate lines 3 ; and / or a second connection reinforcement member 207 is provided between each second sub-interconnection structure 201 and the plurality of first gate lines 2 .

[0117] For example, the arrangement of the first connection reinforcement member 206 and the second connection reinforcement member 207 includes the following situations: First, a first connection reinforcement member 206 is respectively arranged between each first sub-interconnection structure member 201 and a plurality of second gate lines 3. Second, a second connection reinforcement member 207 is respectively arranged between each second sub-interconnection structure member 201 and a plurality of first gate lines 2. Third, a first connection reinforcement member 206 is respectively arranged between each first sub-interconnection structure member 201 and a plurality of second gate lines 3. At the same time, a second connection reinforcement member 207 is respectively arranged between each second sub-interconnection structure member 201 and a plurality of first gate lines 2. For example, Figure 5 In the example, the first connection reinforcement member 206 and the first disconnection opening 2121 are opposite to each other in the up-down direction, and the second connection reinforcement member 207 and the second disconnection opening 3131 are opposite to each other in the up-down direction.

[0118] In this configuration, the first connection reinforcement member 206 strengthens the welding tension of the first sub-interconnection structure member 201 and the second gate line 3, and the second connection reinforcement member 207 strengthens the welding tension of the second sub-interconnection structure member 201 and the first gate line 2, thereby improving the welding stability of the first sub-interconnection structure member 201 and the second gate line 3, and improving the welding stability of the second sub-interconnection structure member 201 and the first gate line 2. In addition, the first gate line 2 and the second gate line 3 at the welding position are avoided from being thickened, thereby reducing the slurry loss of the first gate line 2 and the second gate line 3, and reducing the production cost.

[0119] According to some embodiments of the present invention, referring to Figure 5-Figure 7 , the shape of the first connection reinforcement 206 is dot-shaped or strip-shaped; and / or, the shape of the second connection reinforcement 207 is dot-shaped or strip-shaped. For example, the settings of the first connection reinforcement 206 and the second connection reinforcement 207 include the following situations: First, the shape of the first connection reinforcement 206 is dot-shaped or strip-shaped. Second, the shape of the second connection reinforcement 207 is dot-shaped or strip-shaped. Third, the shape of the first connection reinforcement 206 is dot-shaped or strip-shaped, and the shape of the second connection reinforcement 207 is dot-shaped or strip-shaped. For example, the first connection reinforcement 206 and the second connection reinforcement 207 are both dot-shaped or both strip-shaped. Of course, the shapes of the first connection reinforcement 206 and the second connection reinforcement 207 can also be set to be different.

[0120] Therefore, when the first connection reinforcement member 206 and the second connection reinforcement member 207 are in a point shape, the structure of the first connection reinforcement member 206 and the second connection reinforcement member 207 is simple and easy to produce, thereby improving the production efficiency of the first connection reinforcement member 206 and the second connection reinforcement member 207. When the first connection reinforcement member 206 and the second connection reinforcement member 207 are in a strip shape, the shapes of the first connection reinforcement member 206 and the second connection reinforcement member 207 are roughly similar to the shapes of the corresponding first interconnection structure member 2011 and the second interconnection structure member 2012, effectively ensuring that the first connection reinforcement member 206 overlaps with the first interconnection structure member 2011, and ensuring that the second connection reinforcement member 207 overlaps with the second interconnection structure member 2012, increasing the contact area between the first connection reinforcement member 206 and the first interconnection structure member 2011, and also increasing the contact area between the second connection reinforcement member 207 and the second interconnection structure member 2012, thereby improving the utilization rate of the first connection reinforcement member 206 and the second connection reinforcement member 207.

[0121] Further, refer to Figure 6 and Figure 7, the first connection reinforcement 206 extends along the first direction (i.e., the up-down direction) or the second direction (i.e., the left-right direction), and the first direction is perpendicular to the second direction; and / or, the second connection reinforcement 207 extends along the first direction or the second direction, and the first direction is perpendicular to the second direction. For example, the arrangement of the first connection reinforcement 206 and the second connection reinforcement 207 includes the following situations: First, the first connection reinforcement 206 extends along the first direction or the second direction. Second, the second connection reinforcement 207 extends along the first direction or the second direction. Third, the first connection reinforcement 206 extends along the first direction or the second direction, and the second connection reinforcement 207 extends along the first direction or the second direction. For example, the extension directions of the first connection reinforcement 206 and the second connection reinforcement 207 are the same or different.

[0122] Thus, when the first connection reinforcement member 206 and the second connection reinforcement member 207 extend in the up-down direction respectively, they are the same as the extension direction of the first interconnection structure member 2011 and the second interconnection structure member 2012, and the contact area between the first connection reinforcement member 206 and the second connection reinforcement member 207 and the first interconnection structure member 2011 and the second interconnection structure member 2012 is increased, thereby improving the connection strength between the first interconnection structure member 2011 and the second grid line 3, and improving the connection strength between the second interconnection structure member 2012 and the first grid line 2, thereby further improving the use stability of the battery string 200. When the first connection reinforcement member 206 and the second connection reinforcement member 207 extend in the left-right direction respectively, they are the same as the extension direction of the first grid line 2 and the second grid line 3, and the electrical connection between the first interconnection structure member 2011 and the second grid line 3, and the electrical connection between the second interconnection structure member 2012 and the first grid line 2 is ensured.

[0123] According to some embodiments of the present invention, the first connection reinforcement member 206 and / or the second connection reinforcement member 207 are solder paste members. The solder paste has good ductility at room temperature, stable chemical properties, and is not easily oxidized, so that the first connection reinforcement member 206 and the second connection reinforcement member 207 are easy to form, thereby reducing the difficulty of producing the first connection reinforcement member 206 and the second connection reinforcement member 207. In addition, the service life of the first connection reinforcement member 206 and the second connection reinforcement member 207 is also extended, thereby extending the service life of the battery string 200.

[0124] Optionally, a plurality of battery cells 100 may be connected to form a battery string 200 through an interconnection structure 201. For example, when three battery cells 100 are provided, Figure 3As shown, the first battery cell, the second battery cell and the third battery cell are arranged in sequence from top to bottom, the upper part of the first interconnection structure 2011 on the second battery cell is electrically connected to the second grid line 3 of the second battery cell, the lower part of the first interconnection structure 2011 on the second battery cell is electrically connected to multiple first grid lines 2 of the third battery cell, the lower part of the second interconnection structure 2012 on the second battery cell is electrically connected to multiple first grid lines 2 of the second battery cell, and the upper part of the second interconnection structure 2012 on the second battery cell is electrically connected to multiple second grid lines 3 of the first battery cell, so that three battery cells 100 are connected in series, and multiple battery cells 100 can also be connected in series similarly.

[0125] The photovoltaic assembly (not shown) according to the third embodiment of the utility model comprises the battery cell 100 according to the first embodiment of the utility model, or the battery string 200 according to the second embodiment of the utility model.

[0126] According to the photovoltaic module of the present invention, by adopting the above-mentioned battery sheet 100 or the above-mentioned battery string 200, the production cost of the photovoltaic module is reduced and the power generation of the photovoltaic module is increased.

[0127] The photovoltaic power generation system (not shown) according to the fourth aspect of the utility model comprises the battery cell 100 according to the first aspect of the utility model, or the battery string 200 according to the second aspect of the utility model, or the photovoltaic module according to the third aspect of the utility model.

[0128] According to the photovoltaic power generation system of the present invention, by adopting the above-mentioned battery cell 100, the above-mentioned battery string 200 or the above-mentioned photovoltaic module, the production cost of the photovoltaic power generation system is reduced, the power generation of the photovoltaic power generation system is increased, and the performance of the photovoltaic power generation system is improved.

[0129] Other structures and operations of the photovoltaic assembly and photovoltaic power generation system according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0130] In the description of the present invention, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention.

[0131] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0132] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: Silicon wafer body; A plurality of first gate lines and a plurality of second gate lines, wherein the first gate lines and the second gate lines are arranged on one side of the silicon wafer body in a thickness direction, the plurality of first gate lines and the plurality of second gate lines are alternately arranged along a first direction, the first gate lines and the second gate lines extend along a second direction, the first gate lines and the second gate lines have opposite polarities, and the first direction is perpendicular to the second direction; A first edge gate line, the first edge gate line extends along the first direction, the first edge gate line is connected to one end of a plurality of the first gate lines along the second direction, and the first edge gate line is spaced apart from one end of a plurality of the second gate lines along the second direction; A second edge gate line, the second edge gate line is opposite to the first edge gate line along the second direction, the second edge gate line extends along the first direction, the second edge gate line is connected to the other ends of multiple second gate lines along the second direction, and the second edge gate line is spaced apart from the other ends of multiple first gate lines along the second direction.

2. The battery cell according to claim 1, characterized in that: One end of the first edge gate line is connected to the one end of the first gate line adjacent to one side edge of the silicon wafer body along the first direction among the plurality of first gate lines, and the other end of the first edge gate line extends along the first direction to exceed the one end of the first gate line adjacent to the other side edge of the silicon wafer body among the plurality of first gate lines; and / or One end of the second edge gate line is connected to the one end of the second gate line among the multiple second gate lines that is adjacent to the other side edge of the silicon wafer body along the first direction, and the other end of the second edge gate line extends along the first direction to beyond the one end of the second gate line among the multiple second gate lines that is adjacent to the one side edge of the silicon wafer body.

3. The battery cell according to claim 1, characterized in that: A plurality of the first gate lines extend continuously along the second direction; and / or A plurality of the second gate lines extend continuously along the second direction.

4. The battery cell according to claim 1, characterized in that: A plurality of first openings are respectively formed on the plurality of first gate lines, the plurality of first openings are arranged at intervals along the second direction, and the plurality of first openings on the plurality of first gate lines are equal in number and are respectively opposite to each other along the first direction; A plurality of second openings are respectively formed on the plurality of second gate lines, and the plurality of second openings are arranged at intervals along the second direction. The number of the plurality of second openings of the plurality of second gate lines is equal and they are respectively opposite to each other along the first direction, and the first openings and the second openings are arranged in a staggered manner.

5. The battery cell according to claim 4, characterized in that: The length of the first opening in the second direction is L1, wherein L1 satisfies: 0.4 mm ≤ L1 ≤ 1.6 mm; and / or The length of the second opening in the second direction is L2, wherein L2 satisfies: 0.4 mm ≤ L2 ≤ 1.6 mm.

6. The battery cell according to claim 1, characterized in that: The distance between the first edge gate line and the one end of the plurality of second gate lines along the second direction is a1, wherein a1 satisfies: 100um<a1<800um; and / or The distances between the second edge gate lines and the other ends of the first gate lines along the second direction are all a2, wherein a2 satisfies: 100um<a2<800um.

7. The battery cell according to claim 1, characterized in that: The first edge gate line has a width equal to that of the first gate line; and / or The second edge gate line has the same width as the second gate line.

8. The battery cell according to claim 1, characterized in that: The first gate line has a plurality of first electrical connection segments arranged at intervals, the length of the first electrical connection segment along the second direction is L3, the width of the first electrical connection segment along the first direction is w1, wherein L3 and w1 respectively satisfy: 0mm<L3≤1.5mm, 30μm≤w1≤80μm; and / or The second gate line has a plurality of second electrical connection segments arranged at intervals, the length of the second electrical connection segment along the second direction is L4, the width of the first electrical connection segment along the first direction is w2, wherein L4 and w2 respectively satisfy: 0mm<L4≤1.5mm, 30μm≤w2≤80μm.

9. The battery cell according to claim 1, characterized in that: The distance between the first gate line and the adjacent second gate line is d1, wherein d1 satisfies: 0.4 mm≤d1≤1 mm.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The distance between two adjacent first gate lines is d2, wherein d2 satisfies: 0.8 mm ≤ d2 ≤ 2 mm; The distance between two adjacent second gate lines is d3, wherein d3 satisfies: 0.8 mm≤d3≤2 mm.

11. A battery string, characterized in that: include: A plurality of battery cells, wherein the battery cells are battery cells according to any one of claims 1 to 10; A plurality of interconnecting structural members, two adjacent battery cells are electrically connected via the plurality of interconnecting structural members.

12. The battery string according to claim 11, characterized in that: The plurality of interconnected structural members include: A plurality of first interconnection structures, wherein the plurality of first interconnection structures are arranged at intervals along the second direction, each of the first interconnection structures is respectively separated from a plurality of the first gate lines, and each of the first interconnection structures is respectively electrically connected to a plurality of the second gate lines; A plurality of second interconnect structures are arranged alternately with the plurality of first interconnect structures along the second direction, each of the second interconnect structures is separated from the plurality of second gate lines, and each of the second interconnect structures is electrically connected to the plurality of first gate lines.

13. The battery string according to claim 12, characterized in that: A plurality of the first gate lines extend continuously along the second direction, each of the first interconnection structures is separated from the plurality of the first gate lines by a plurality of first insulating connectors, and the plurality of the first insulating connectors are respectively connected between the first interconnection structures and the plurality of the first gate lines; and / or The plurality of second gate lines extend continuously along the second direction, each of the second interconnection structures is separated from the plurality of second gate lines by a plurality of second insulating connectors, and the plurality of second insulating connectors are respectively connected between the second interconnection structures and the plurality of second gate lines.

14. The battery string according to claim 13, characterized in that: The first insulating connector is insulating glue; and / or The second insulating connector is insulating glue.

15. The battery string according to claim 12, characterized in that: The first interconnect structure comprises a first edge interconnect structure and a plurality of first sub-interconnect structures, the first edge interconnect structure is located on a side of the plurality of first sub-interconnect structures adjacent to the second edge gate lines, the plurality of first gate lines are continuous at a position opposite to the first edge interconnect structure, and the plurality of first gate lines are disconnected at a position opposite to the first sub-interconnect structure; The second interconnect structure includes a second edge interconnect structure and a plurality of second sub-interconnect structures, the second edge interconnect structure is located on a side of the plurality of second sub-interconnect structures adjacent to the first edge gate lines, the plurality of second gate lines are continuous at a position opposite to the second edge interconnect structure, and the plurality of second gate lines are disconnected at a position opposite to the second sub-interconnect structure.

16. The battery string according to claim 15, characterized in that: A third insulating connector is provided at a position where the first gate lines are opposite to the first interconnection structures, and the third insulating connector is provided at a position where the first edge interconnection structure is opposite to the first gate lines, respectively, and the third insulating connectors are respectively connected between the first edge interconnection structure and the first gate lines; A fourth insulating connector is provided at a position where the plurality of second gate lines are opposite to the second interconnection structure, and a fourth insulating connector is provided at a position where the second edge interconnection structure is opposite to the plurality of second gate lines, respectively. The plurality of fourth insulating connectors are respectively connected between the first edge interconnection structure and the plurality of second gate lines.

17. The battery string according to claim 16, characterized in that: At least two third insulating connectors are provided between each of the first sub-interconnection structures and the first gate lines, and the third insulating connectors are located at the disconnection points where the first gate lines are opposite to the first sub-interconnection structures; At least two fourth insulating connectors are disposed between each of the second interconnection structural members and a plurality of the second gate lines. The fourth insulating connectors are located at the disconnection positions where the second gate lines are opposite to the second interconnection structural members.

18. The battery string according to claim 17, characterized in that: At least two of the third insulating connectors are respectively disposed on two outermost sides of the plurality of the first gate lines along the first direction; At least two of the fourth insulating connectors are respectively disposed on two outermost sides of the plurality of second gate lines along the first direction.

19. The battery string according to claim 16, characterized in that: The first edge interconnection structure and the plurality of the first sub-interconnection structures are respectively welded to the plurality of the second gate lines to achieve electrical connection; The second edge interconnection structure and the plurality of second sub-interconnection structures are respectively welded to the plurality of first gate lines to achieve electrical connection.

20. The battery string according to claim 16, characterized in that: At least one fifth connecting member is disposed on one side of the plurality of first sub-interconnection structures and the plurality of second sub-interconnection structures away from the plurality of first gate lines and the plurality of second gate lines.

21. The battery string according to claim 16, characterized in that: The width of the third insulating connector is w3, and the thickness of the third insulating connector is t1, wherein w3 and t1 respectively satisfy: 100 μm≤w3≤700 μm, 50 μm≤t1≤180 μm; The width of the fourth insulating connector is w4, and the thickness of the fourth insulating connector is t2, wherein w4 and t2 respectively satisfy: 100 μm≤w4≤700 μm, 50 μm≤t2≤180 μm.

22. The battery string according to claim 16, characterized in that: A first connection reinforcement member is respectively provided between each of the first sub-interconnection structures and a plurality of the second gate lines; and / or A second connection reinforcement member is respectively provided between each of the second interconnection sub-structure members and a plurality of the first gate lines.

23. The battery string according to claim 22, characterized in that: The first connection reinforcement member is in the shape of a dot or a strip; and / or The second connection reinforcement member is in a dot shape or a strip shape.

24. The battery string according to claim 22, characterized in that: The first connection reinforcement member extends along a first direction or a second direction, the first direction and the second direction being perpendicular; and / or The second connection reinforcement member extends along a first direction or a second direction, and the first direction is perpendicular to the second direction.

25. The battery string according to any one of claims 22 to 24, characterized in that: The first connection reinforcement member and / or the second connection reinforcement member is a solder paste member.

26. A photovoltaic module, characterized in that: It comprises a battery cell according to any one of claims 1 to 10, or a battery string according to any one of claims 11 to 25.

27. A photovoltaic power generation system, characterized in that: It comprises a cell according to any one of claims 1 to 10, or a cell string according to any one of claims 11 to 25, or a photovoltaic module according to claim 26.

Images