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

Abstract

The invention discloses a battery piece, a battery string, a photovoltaic module and a photovoltaic power generation system.The battery piece comprises a battery piece body, a plurality of first electric connection assemblies and a plurality of second electric connection assemblies, each first electric connection assembly comprises a first connecting line, and each second electric connection assembly comprises a second connecting line; a gap is formed between the first connecting line and the surface of one side of the battery piece body in the Z direction, a gap is formed between the first connecting line and the first grid line in the Z direction, the first connecting line is electrically connected with the multiple second grid lines, and a gap is formed between the second connecting line and the surface of one side of the battery piece body in the Z direction. The second connecting lines and the second grid lines are spaced in the Z direction, and the first connecting lines are electrically connected with the multiple first grid lines respectively. According to the battery piece disclosed by the invention, short circuit of the battery piece is avoided, the use amount of materials is reduced, the production process is reduced, the production cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a battery cell, a battery string, a photovoltaic module and a photovoltaic power generation system. Background Art

[0002] In the development of photovoltaic modules, Perc cells, Topcon cells, HJT cells, etc. have been produced one after another. Subsequently, back-contact solar cells (BC cells) were produced. BC cells have no obstructions such as grid lines and welding strips on the front of the cell, which increases the photocurrent. The positive grid lines, negative grid lines and welding strips are all on the back of the cell of the BC cell. In BC cells with main grids, photovoltaic modules use welding strips to weld the cells into cell strings, and the welding strips are used to collect current. In BC cells without main grids, the secondary grid lines are used to collect current, and the welding strips are used to collect current.

[0003] In the related art, in the process of forming a battery string, the welding strip needs to be connected to the grid line of the same polarity on the battery cell and separated from the grid lines of different polarities for insulation. Usually, insulating glue is used to separate the welding strip from the grid lines of different polarities to avoid short circuits. However, applying insulating glue during the production of battery strings not only increases the production process of the battery string, prolongs the production time of the battery string, but also increases the amount of materials used in the production of the battery string, increasing the production cost of the battery string. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a battery cell that avoids short circuits in the battery cell, reduces the amount of materials used, reduces production processes, thereby reducing production costs and improving production efficiency.

[0005] The second objective of the present invention is to provide a battery string using the above-mentioned battery cell.

[0006] The third object of the present invention is to provide a photovoltaic module using the above-mentioned battery cell or battery string.

[0007] A fourth object of the present invention is to provide a photovoltaic power generation system using the above-mentioned solar cell, solar cell string or photovoltaic module.

[0008] According to a first aspect of the present invention, a battery cell comprises: a battery cell body, a plurality of first grid lines and a plurality of second grid lines are arranged on one side surface of the battery cell body, the plurality of first grid lines and the plurality of second grid lines are arranged alternately and spaced along the Y direction, and the polarities of the first grid lines and the second grid lines are opposite; a plurality of first electrical connection components, the first electrical connection components include first connection line connection components; a plurality of second electrical connection components, the second electrical connection components include second connection lines; the plurality of first connection lines and the plurality of second connection lines are arranged alternately and spaced along the X direction, the first connection lines are spaced from the one side surface of the battery cell body along the Z direction, and the first connection lines are spaced from the one side surface of the battery cell body; There are gaps between the first grid lines along the Z direction, that is, the first connecting line has a certain gap from the surface of the battery cell body, and is not in direct contact. The first connecting line is electrically connected to multiple second grid lines respectively, and there is a gap between the second connecting line and the one side surface of the battery cell body along the Z direction. The second connecting line has a certain gap from the surface of the battery cell body, and is not in direct contact. There is a gap between the second connecting line and the second grid line along the Z direction, and the second connecting component is electrically connected to multiple first grid lines respectively. The Y direction, the X direction and the Z direction are perpendicular to each other, and the Z direction is the thickness direction of the battery cell.

[0009] According to the battery cell of the present invention, there is a gap between the first connecting wire and the plurality of first grid lines along the front-to-back direction, and there is a gap between the second connecting wire and the plurality of second grid lines along the front-to-back direction, which effectively avoids short circuits in the battery cell, thereby improving the performance of the battery cell. In addition, there is no need to use other structural parts or insulating parts (such as insulating glue) to achieve insulation, which reduces the material usage of insulating parts, reduces production costs, and also reduces the processing technology of the battery cell, making it easier to produce and process, thereby improving the yield rate and production efficiency of the battery cell production. In addition, the shielding of the battery cell body by the first connecting wire and the second connecting wire is reduced, thereby improving the photoelectric conversion capacity of the battery cell.

[0010] According to some embodiments of the present invention, the first connecting line includes multiple first connecting segments, the first electrical connection assembly also includes multiple first connecting components, the multiple first connecting segments and the multiple first connecting components are electrically connected in sequence, and the multiple first connecting components are electrically connected to the multiple second gate lines respectively; the second connecting line includes multiple second connecting segments, the second electrical connection assembly also includes multiple second connecting components, the multiple second connecting segments and the multiple second connecting components are electrically connected in sequence, and the multiple second connecting components are electrically connected to the multiple first gate lines respectively.

[0011] According to some embodiments of the present invention, the maximum width of the first connecting segment is d1, wherein d1 satisfies: 0.01 mm≤d1≤0.2 mm; and / or the maximum width of the second connecting segment is d2, wherein d2 satisfies: 0.01 mm≤d2≤0.2 mm.

[0012] According to some embodiments of the present invention, the cross-sectional shape of the first connecting segment includes a circle, an ellipse, a polygon or a wedge; and / or the cross-sectional shape of the second connecting segment includes a circle, an ellipse, a polygon or a wedge.

[0013] According to some embodiments of the present invention, the angle between one end of the first connecting segment and the one side surface of the battery cell body is an acute angle, the angle between the other end of the first connecting segment and the one side surface of the battery cell body is an acute angle, or the angle between the other end of the first connecting segment and the one side surface of the battery cell body is an obtuse angle; and / or, the angle between one end of the second connecting segment and the one side surface of the battery cell body is an acute angle, the angle between the other end of the second connecting segment and the one side surface of the battery cell body is an acute angle, or the angle between the other end of the second connecting segment and the one side surface of the battery cell body is an obtuse angle.

[0014] According to some embodiments of the present invention, the maximum distance between the first connecting segment and the one side surface of the battery cell body is h1, wherein h1 satisfies: 0.02mm≤h1≤5mm; and / or, the distance between the highest point of the second connecting segment and the battery cell is h2, wherein h2 satisfies: 0.02mm≤h2≤5mm.

[0015] According to some embodiments of the present invention, the h1 further satisfies: 0.05 mm ≤ h1 ≤ 0.3 mm; and / or, the h2 further satisfies: 0.05 mm ≤ h2 ≤ 0.3 mm.

[0016] According to some embodiments of the present invention, a first interconnection portion is formed at the connection between the first connection section and the first connection component, the orthographic projection area of ​​the first interconnection portion on the first connection component is s1, the cross-sectional area of ​​the first connection section is s2, and the orthographic projection area of ​​the first connection component on the battery cell body is s3, wherein s1, s2 and s3 satisfy: s2<s1≤ s3; and / or, a second interconnection portion is formed at the connection between the second connecting section and the second connecting member, the orthographic projection area of ​​the second interconnection portion on the second connecting member is s4, the cross-sectional area of ​​the second connecting section is s5, and the orthographic projection area of ​​the second connecting member on the battery cell body is s6, wherein s4, s5 and s6 satisfy: s5<s4≤ s6.

[0017] According to some embodiments of the present invention, the orthographic projection shape of the first interconnection portion on the first connecting component is a circle, an oblong circle or a polygon; the orthographic projection shape of the second interconnection portion on the second connecting component is a circle, an oblong circle or a polygon.

[0018] According to some embodiments of the present invention, the first gate line includes a plurality of first gate line segments arranged at intervals along the X direction, the first connecting segment is located between two adjacent first gate line segments of the plurality of first gate lines, and the first connecting segment is spaced apart from ends of the two adjacent first gate line segments; the second gate line includes a plurality of second gate line segments arranged at intervals along the X direction, the second connecting segment is located between two adjacent second gate line segments of the plurality of second gate lines, and the second connecting segment is spaced apart from ends of the two adjacent second gate line segments.

[0019] According to some embodiments of the present invention, a first break opening is defined between two adjacent first gate line segments, and multiple first break openings of multiple first gate lines are opposite to each other along the Y direction, and the first connecting component is arranged on the second gate line segment, and the first connecting component and the first break opening are opposite to each other along the Y direction; a second break opening is defined between two adjacent second gate line segments, and multiple second break openings of multiple second gate lines are opposite to each other along the Y direction, multiple first break openings and multiple second break openings are alternately arranged along the Y direction, and the second connecting component is arranged on the first gate line segment, and the second connecting component and the second break opening are opposite to each other along the Y direction.

[0020] According to some embodiments of the present invention, the distance between the first connecting segment and the end of the adjacent first gate line segment is L1, wherein L1 satisfies: 0.15mm≤L1≤1.6mm; and / or the distance between the second connecting segment and the end of the adjacent second gate line segment is L2, wherein L2 satisfies: 0.15mm≤L2≤1.6mm.

[0021] According to some embodiments of the present invention, along the Y direction, two sides of the first connecting component protrude from two side edges of the second gate line respectively; and / or along the Y direction, two sides of the second connecting component protrude from two side edges of the first gate line respectively.

[0022] According to some embodiments of the present invention, a plurality of third gate lines and a plurality of fourth gate lines are further provided on the battery cell body, and the plurality of third gate lines and the plurality of fourth gate lines are alternately arranged along the X direction, the third gate line is provided between two adjacent first gate line segments of the plurality of first gate lines, and the third gate line and the ends of the two adjacent first gate line segments are spaced apart from each other, the third gate line is electrically connected to the plurality of second gate lines respectively, the fourth gate line is provided between two adjacent second gate line segments of the plurality of second gate lines, and the ends of the fourth gate line and the two adjacent second gate line segments are spaced apart from each other, the fourth gate line is electrically connected to the plurality of first gate lines respectively, a plurality of first connecting components are spaced apart on a side of the third gate line away from the battery cell body, and a plurality of second connecting components are spaced apart on a side of the fourth gate line away from the battery cell body.

[0023] According to some embodiments of the present invention, a first break is defined between two adjacent first gate line segments, and multiple first break of multiple first gate lines are opposite to each other along the Y direction, and the first connecting component is located on the third gate line at the first break, or the first connecting component is located at the connection between the third gate line and the second gate line; and / or the second connecting component is located on the fourth gate line at the second break, or the second connecting component is located at the electrical connection between the fourth gate line and the first gate line.

[0024] According to some embodiments of the present invention, the first connecting section and / or the first connecting component is a metal part or an alloy part; and / or the second connecting section and / or the second connecting component is a metal part or an alloy part.

[0025] According to some embodiments of the present invention, the metal includes Au, Al, Cu, Ag or Ni.

[0026] According to some embodiments of the present invention, a first protective layer is provided on the outer circumference of the first connecting section and / or the first connecting component; and / or a second protective layer is provided on the outer circumference of the second connecting section and / or the second connecting component. According to some embodiments of the present invention, the first connecting section and the first connecting component are integrated into an integral structure by a bonding process; and / or the second connecting section and the second connecting component are integrated into an integral structure by a bonding process.

[0027] A battery string according to an embodiment of the second aspect of the present invention comprises a plurality of battery cells according to an embodiment of the first aspect of the present invention, wherein the plurality of battery cells are electrically connected via a plurality of the first electrical connection components and a plurality of the second electrical connection components.

[0028] According to some embodiments of the present invention, the second gate lines between two adjacent battery cells are electrically connected via a plurality of the first electrical connection components, and the first gate lines between two adjacent battery cells are electrically connected via a plurality of the second electrical connection components.

[0029] The photovoltaic module according to the third embodiment of the present invention comprises the solar cell according to the first embodiment of the present invention, or the solar cell string according to the second embodiment of the present invention.

[0030] The photovoltaic power generation system according to the fourth embodiment of the present invention comprises the battery cell according to the first embodiment of the present invention, or the battery string according to the second embodiment of the present invention, or the photovoltaic module according to the third embodiment of the present invention.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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: Figure 1 is a schematic diagram of a battery cell according to an embodiment of the present invention; Figure 2 is a schematic diagram of a battery cell according to another embodiment of the present invention; Figure 3 yes Figure 2 sectional view of Figure 4 yes Figure 2 A cross-sectional view of another case; Figure 5 is a schematic diagram of a first interconnection portion of a battery cell according to an embodiment of the present invention; Figure 6 yes Figure 5 A schematic diagram of another situation; Figure 7 is a schematic diagram of a battery string according to an embodiment of the present invention.

[0033] Reference numerals: 100. Battery cell; 1. Battery cell body; 11. First layer; 12. Second layer; 13. Third layer; 14, fourth floor; 15, fifth floor; 16, sixth floor; 2. first gate line; 21. first gate line segment; 22. first disconnection port; 3. second gate line; 31. second gate line segment; 32. second disconnection port; 4. first electrical connection component; 41. first connection line; 411. first connection section; 42. first connecting member; 43. first interconnecting portion; 44. first interconnecting member; 5. second electrical connection component; 51. second connection line; 511. second connection section; 52. A second connecting member; 6. The third grid line; 200. Battery string. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 6 A battery cell 100 according to a first aspect of an embodiment of the present invention is described.

[0035] As shown in FIG1 , a battery cell 100 according to an embodiment of the first aspect of the present invention comprises a battery cell body 1, a plurality of first electrical connection components 4 and a plurality of second electrical connection components 5. In the description of the present invention, “plurality” means two or more.

[0036] Specifically, a plurality of first grid lines 2 and a plurality of second grid lines 3 are arranged on one side surface of the battery cell body 1, and the plurality of first grid lines 2 and the plurality of second grid lines 3 are arranged along the Y direction (eg Figure 1 The first gate lines 2 and the second gate lines 3 are arranged alternately in an up-and-down direction as shown, and the polarities of the first gate lines 2 and the second gate lines 3 are opposite.

[0037] For example, in Figure 1 In the example, a plurality of first gate lines 2 and a plurality of second gate lines 3 are alternately arranged in the up-down direction, and the first gate lines 2 and the second gate lines 3 are both extended in the left-right direction. The opposite polarity of the first gate line 2 and the second gate line 3 can be understood as: when the first gate line 2 is a positive gate line, the second gate line 3 is a negative gate line; when the first gate line 2 is a negative gate line, the second gate line 3 is a positive gate line. In this way, the structure and arrangement of the first gate line 2 and the second gate line 3 are simple and easy to produce, thereby reducing the production cost of the battery cell 100. Among them, the first gate line 2 can be a gate line continuous in the left-right direction, or a gate line discontinuous in the left-right direction. The second gate line 3 can be a gate line continuous in the left-right direction, or a gate line discontinuous in the left-right direction.

[0038] Reference Figure 1-Figure 3 The first electrical connection component 4 includes a first connection line 41. The second electrical connection component 5 includes a second connection line 51. The plurality of first connection lines 41 and the plurality of second connection lines 51 are alternately arranged along the X direction, and the first connection line 41 and the side surface of the battery cell body 1 are connected along the Z direction (such as Figure 3There is a gap between the first connecting line 41 and the first grid line 2 along the Z direction, that is, the first connecting line 2 has a certain gap from the surface of the battery cell body 1, and is not in direct contact. The first connecting line 41 is electrically connected to multiple second grid lines 3 respectively, and there is a gap between the second connecting line 51 and one side surface of the battery cell body 1 along the Z direction, and there is a gap between the second connecting line 51 and the second grid line 3 along the Z direction. The second connecting line 3 has a certain gap from the surface of the battery cell body 1, and is not in direct contact. The second connecting line 51 is electrically connected to multiple first grid lines 2 respectively, and the Y direction, the X direction and the Z direction are perpendicular to each other, and the Z direction is the thickness direction of the battery cell 100.

[0039] For example, in Figure 1-Figure 3 In the example, the first connecting line 41 is arranged roughly in a wave shape, and along the direction in which the first connecting line 41 extends, the first connecting line 41 includes a plurality of raised portions and a plurality of recessed portions that are arranged alternately, and the plurality of raised portions of the first connecting line 41 are respectively spaced apart from the corresponding plurality of first grid lines 2 along the front-to-back direction (that is, the thickness direction of the battery cell body 1), that is, the first connecting line 41 is respectively spaced apart from the corresponding plurality of first grid lines 2 for insulation, and the plurality of recessed portions of the first connecting line 41 are respectively electrically connected to the plurality of second grid lines 3.

[0040] The second connection line 51 is arranged roughly in a wave shape, and along the direction in which the second connection line 51 extends, the second connection line 51 includes a plurality of alternately arranged raised portions and a plurality of recessed portions, and the plurality of raised portions of the second connection line 51 are spaced apart from the corresponding plurality of second grid lines 3 along the front-to-back direction (i.e., the thickness direction of the battery cell body 1), that is, the second connection line 51 is spaced apart from the corresponding plurality of second grid lines 3 to be insulated, and the plurality of recessed portions of the second connection line 51 are electrically connected to the corresponding plurality of first grid lines 2. Among them, the first connection line 41 can be a single line or formed by connecting a plurality of line segments end to end, and the second connection line 51 can be a single line or formed by connecting a plurality of line segments end to end, and it is set according to the actual use.

[0041] It should be noted that the connection relationship between each first electrical connection component 4 and each second electrical connection component 5 and the battery cell 100 is similar. For a first electrical connection component 4, a first connection line 41 in a first electrical connection component 4 is electrically connected to a plurality of second gate lines 3 opposite to each other in the up-down direction (for example, the electrical connection is achieved by printing, physical vapor deposition, chemical vapor deposition or plasma enhanced chemical vapor deposition), and there is a gap between the first connection line 41 of the first electrical connection component 4 and the corresponding plurality of first gate lines 2 in the front-to-back direction to achieve insulation between the first connection line 41 and the first gate lines 2. For a second electrical connection component 5, a second connection line 51 in a second electrical connection component 5 is electrically connected to a plurality of first gate lines 2 opposite to each other in the up-down direction (for example, the electrical connection is achieved by printing, physical vapor deposition, chemical vapor deposition or plasma enhanced chemical vapor deposition), and there is a gap between the second connection line 51 of the second electrical connection component 5 and the corresponding plurality of second gate lines 3 in the front-to-back direction to achieve insulation between the second connection line 51 and the second gate lines 3.

[0042] In this way, by separating the plurality of first grid lines 2 and the first connecting line 41 in the front-to-back direction, the plurality of first grid lines 2 are insulated from the first connecting line 41, and by separating the plurality of second grid lines 3 and the second connecting line 51 in the front-to-back direction, the plurality of second grid lines 3 are insulated from the second connecting line 51, thereby avoiding short circuits and improving the reliability of the battery cell 100. In addition, it is possible to use other structural members or insulating members (such as insulating glue) on the battery cell 100, which can be specifically set according to actual use conditions. When there are no other structural members or insulating members, the amount of material used for the insulating members is reduced, and the production cost of the battery cell 100 is reduced. The structure of the battery cell 100 is also simplified, the processing technology of the battery cell 100 is reduced, the production and processing are convenient, and the yield rate and production efficiency of the battery cell 100 are improved. In addition, the first connecting line 41 and the second connecting line 51 are arranged at intervals from the battery cell body 1 in the front-to-back direction, which reduces the shielding of the first connecting line 41 and the second connecting line 51 on the battery cell body 1, thereby improving the photoelectric conversion capacity of the battery cell 100. Moreover, the current on the plurality of second gate lines 3 is derived through the first connection line 41, and the current on the plurality of first gate lines 2 is derived through the second connection line 51, so as to realize the current extraction on the battery cell 100, thereby ensuring that the battery cell 100 can be used normally for a long time.

[0043] According to the battery cell 100 of the present invention, there is a gap between the first connecting wire 41 and the plurality of first grid lines 2 along the front-to-back direction, and there is a gap between the second connecting wire 51 and the plurality of second grid lines 3 along the front-to-back direction, which effectively avoids the battery cell 100 from short circuiting, thereby improving the performance of the battery cell 100. In addition, the battery cell 100 can be insulated by using a solution that does not require other structural parts or insulating parts (such as insulating glue), which reduces the material usage of insulating parts, reduces production costs, and also reduces the processing technology of the battery cell 100, which is convenient for production and processing, and improves the yield rate and production efficiency of the battery cell 100. In addition, the shielding of the battery cell body 1 by the first connecting wire 41 and the second connecting wire 51 is reduced, thereby improving the photoelectric conversion capacity of the battery cell 100.

[0044] According to some embodiments of the present invention, referring to Figure 1 and Figure 3 The first connecting line 41 includes a plurality of first connecting segments 411, the first electrical connection assembly 4 also includes a plurality of first connecting parts 42, the plurality of first connecting segments 411 and the plurality of first connecting parts 42 are electrically connected in sequence, and the plurality of first connecting parts 42 are electrically connected to the plurality of second gate lines 3, respectively. The second connecting segment 511 includes a plurality of second connecting segments 511, the second electrical connection assembly 5 also includes a plurality of second connecting parts 52, the plurality of second connecting segments 511 and the plurality of second connecting parts 52 are electrically connected in sequence, and the plurality of second connecting parts 52 are electrically connected to the plurality of first gate lines 2, respectively.

[0045] For example, in Figure 1 and Figure 3 In the example, a plurality of first connection parts 42 are arranged at intervals along the vertical direction, and a plurality of first connection segments 411 are located between each two adjacent first connection parts 42, that is, the upper end of the first connection segment 411 is electrically connected (for example, bonded) to the rear side surface of one of the two adjacent first connection parts 42 (that is, the side of the first connection part 42 away from the battery cell body 1), and the lower end of the first connection segment 411 is electrically connected to the rear side surface of the other of the two adjacent first connection parts 42, and they are electrically connected in sequence. The first connection segment 411 is partially tilted between the above-mentioned two adjacent first connection parts 42, and there is a gap between the first connection segment 411 and the above-mentioned one side surface of the battery cell body 1 along the Z direction, and there is a gap between the first connection segment 41 and the corresponding first grid line 2 along the Z direction.

[0046] A plurality of second connecting parts 52 are arranged at intervals along the vertical direction, and a plurality of second connecting sections 511 are located between each two adjacent second connecting parts 52, that is, the upper end of the second connecting section 511 is electrically connected (for example, bonded) to the rear side surface of one of the two adjacent second connecting parts 52 (that is, the side of the second connecting part 52 away from the battery cell body 1), and the lower end of the second connecting section 511 is electrically connected to the rear side surface of the other of the two adjacent second connecting parts 52, and they are electrically connected in sequence. The first electrical connection component 4 and the second electrical connection component 5 extend in the vertical direction respectively. The second connecting section 511 is partially tilted between the above-mentioned two adjacent second connecting parts 52, and there is a gap between the second connecting section 511 and the above-mentioned one side surface of the battery cell body 1 along the Z direction, and there is a gap between the second connecting section 51 and the corresponding first grid line 2 along the Z direction. However, it is not limited to this. For example, the end of the first connecting section 411 can also be thickened to be electrically connected to the first connecting part 42, and the end of the second connecting section 511 can be thickened to be electrically connected to the second connecting part 52.

[0047] In this way, by sequentially electrically connecting a plurality of first connecting segments 411 and a plurality of first connecting parts 42, the first electrical connection assembly 4 can be connected to a long line, which is convenient for the use of the first electrical connection assembly 4. By sequentially electrically connecting a plurality of second connecting segments 511 and a plurality of second connecting parts 52, the second electrical connection assembly 5 can be connected to a long line, which is convenient for the use of the second electrical connection assembly 5. In addition, the first connecting segment 411 and the first connecting part 42 are electrically connected by bonding, and the second connecting segment 511 and the second connecting part 52 are electrically connected by bonding, which improves the physical and chemical properties of the connection between the first connecting segment 411 and the first connecting part 42, improves the physical and chemical properties of the connection between the second connecting segment 511 and the second connecting part 52, improves the accuracy of the connection, avoids the occurrence of offset during the connection process, and further avoids the occurrence of a short circuit. In addition, the first electrical connection assembly 4 is sequentially electrically connected by a plurality of first connecting segments 411 and a plurality of first connecting parts 42, and the current on the plurality of second gate lines 3 can be derived along the first connecting line 41 through the plurality of first connecting parts 42. The second electrical connection component 5 is electrically connected in sequence through multiple second connection segments 511 and multiple second connection components 52, and can lead the current on multiple first gate lines 2 through multiple second connection components 52 along the second connection line 51, so as to realize the current on the battery cell 100, thereby ensuring that the battery cell 100 can be used normally for a long time.

[0048] According to some embodiments of the present invention, the maximum width of the first connection segment 411 is d1, wherein d1 satisfies: 0.01 mm ≤ d1 ≤ 0.2 mm. For example, when the maximum width of the first connection segment 411 is greater than 0.2 mm, the width of the first connection segment 411 is relatively large, which increases the material usage of the first connection segment 411, increases the production cost of the first connection segment 411, and thus increases the production cost of the battery cell 100. When the maximum width of the first connection segment 411 is less than 0.01 mm, the width of the first connection segment 411 is relatively small, which increases the resistance of the first connection segment 411, reduces the conductivity of the first connection segment 411, and thus reduces the photoelectric conversion capacity of the battery cell 100.

[0049] Therefore, by setting the maximum width d1 of the first connecting segment 411 to satisfy: 0.01mm≤d1≤0.2mm, the maximum width of the first connecting segment 411 is reasonably set, the material usage of the first connecting segment 411 is reduced, the production cost of the first connecting segment 411 is reduced, and thus the production cost of the battery cell 100 is reduced. In addition, the resistance of the first connecting segment 411 is reduced, and the conductivity of the first connecting segment 411 is improved, thereby improving the photoelectric conversion capacity of the battery cell 100, and further improving the performance of the battery cell 100.

[0050] According to other embodiments of the present invention, the maximum width of the second connecting segment 511 is d2, wherein d2 satisfies: 0.01 mm ≤ d2 ≤ 0.2 mm. For example, when the maximum width of the second connecting segment 511 is greater than 0.2 mm, the width of the second connecting segment 511 is relatively large, which increases the material usage of the second connecting segment 511, increases the production cost of the second connecting segment 511, and thus increases the production cost of the battery cell 100. When the maximum width of the second connecting segment 511 is less than 0.01 mm, the width of the second connecting segment 511 is relatively small, which increases the resistance of the second connecting segment 511, reduces the conductivity of the second connecting segment 511, and thus reduces the photoelectric conversion capacity of the battery cell 100.

[0051] Therefore, by setting the maximum width d2 of the second connecting segment 511 to satisfy: 0.01mm≤d2≤0.2mm, the maximum width of the second connecting segment 511 is reasonably set, the material usage of the second connecting segment 511 is reduced, the production cost of the second connecting segment 511 is reduced, and thus the production cost of the battery cell 100 is reduced. In addition, the resistance of the second connecting segment 511 is reduced, and the conductivity of the second connecting segment 511 is improved, thereby improving the photoelectric conversion capacity of the battery cell 100, and further improving the performance of the battery cell 100.

[0052] According to some further embodiments of the present invention, the maximum width of the first connecting segment 411 is d1, and the maximum width of the second connecting segment 511 is d2, wherein d1 and d2 respectively satisfy: 0.01mm≤d1≤0.2mm, 0.01mm≤d2≤0.2mm. Thus, the maximum width of the first connecting segment 411 and the maximum width of the second connecting segment 511 are reasonably set, which reduces the material usage of the first connecting segment 411 and the second connecting segment 511, reduces the production cost of the first connecting segment 411 and the second connecting segment 511, and thus reduces the production cost of the battery cell 100. In addition, the resistance of the first connecting segment 411 and the resistance of the second connecting segment 511 are reduced, and the conductivity of the first connecting segment 411 and the second connecting segment 511 is improved, thereby improving the photoelectric conversion capacity of the battery cell 100, and further improving the performance of the battery cell 100.

[0053] Further, the cross-sectional shape of the first connecting segment 411 includes a circle, an ellipse, a polygon or a wedge; and / or, the cross-sectional shape of the second connecting segment 511 includes a circle, an ellipse, a polygon or a wedge. For example, the configuration of the first connecting segment 411 and the second connecting segment 511 includes the following situations: the cross-sectional shape of the first connecting segment 411 includes a circle, an ellipse, a polygon or a wedge. Second, the cross-sectional shape of the second connecting segment 511 includes a circle, an ellipse, a polygon or a wedge. Third, the cross-sectional shape of the first connecting segment 411 includes a circle, an ellipse, a polygon or a wedge. At the same time, the cross-sectional shape of the second connecting segment 511 includes a circle, an ellipse, a polygon or a wedge.

[0054] Thus, when the cross-sectional shape of the first connecting segment 411 and the cross-sectional shape of the second connecting segment 511 are respectively circular or elliptical, the structures of the first connecting segment 411 and the second connecting segment 511 are simple, easy to form and process, thereby improving the production efficiency of the first connecting segment 411 and the second connecting segment 511. When the cross-sectional shape of the first connecting segment 411 and the cross-sectional shape of the second connecting segment 511 are respectively polygonal or wedge-shaped, during the electrical connection (e.g., bonding) of the first connecting segment 411 and the first connecting component 42, the contact area between the end of the first connecting segment 411 and the first connecting component 42 is increased, which is convenient for connection. During the electrical connection (e.g., bonding) of the second connecting segment 511 and the second connecting component 52, the contact area between the end of the second connecting segment 511 and the second connecting component 52 is increased, which is convenient for connection. It should be noted that when the cross-sectional shape of the first connecting segment 411 is circular, the maximum width of the first connecting segment 411 is the diameter of the first connecting segment 411. When the cross-sectional shape of the second connecting segment 511 is circular, the maximum width of the second connecting segment 511 is the diameter of the second connecting segment 511. When the cross-sectional shapes of the first connecting segment 411 and the second connecting segment 511 are polygonal respectively, they may be any shapes such as rectangle, triangle, rhombus or trapezoid.

[0055] According to some embodiments of the present invention, the parameter Figure 3 and Figure 4 , the angle between one end of the first connecting segment 411 and one side surface of the battery cell body 1 is an acute angle, the angle between the other end of the first connecting segment 411 and one side surface of the battery cell body 1 is an acute angle, or the angle between the other end of the first connecting segment 411 and one side surface of the battery cell body 1 is an obtuse angle.

[0056] For example, the angle between the lower end of the first connecting segment 411 and the side surface of the battery cell body 1 is an obtuse angle, and the angle between the upper end of the first connecting segment 411 and the side surface of the battery cell body 1 is an acute angle. Figure 3 In the example of , the angle between the lower end of the first connecting segment 411 and the side surface of the battery cell body 1 is an acute angle, and the angle between the upper end of the first connecting segment 411 and the side surface of the battery cell body 1 is an obtuse angle. Figure 4 In the example, the angle between the lower end of the first connecting segment 411 and the side surface of the battery cell body 1 is an acute angle, and the angle between the upper end of the first connecting segment 411 and the side surface of the battery cell body 1 is an acute angle.

[0057] Such arrangement effectively ensures that there is a gap between the first connecting segment 411 and the battery cell body 1, that is, effectively ensures that there is a gap between the first connecting segment 411 and the first grid line 2 in the front-to-back direction, thereby effectively avoiding a short circuit in the battery cell 100. In addition, the flexibility of the arrangement of the first connecting segment 411 is improved, which is convenient for flexible arrangement according to actual use conditions, and improves the applicability of the battery cell 100.

[0058] According to other embodiments of the present invention, the angle between one end of the second connecting segment 511 and one side surface of the battery cell body 1 is an acute angle, the angle between the other end of the second connecting segment 511 and one side surface of the battery cell body 1 is an acute angle, or the angle between the other end of the second connecting segment 511 and one side surface of the battery cell body 1 is an obtuse angle.

[0059] For example, the angle between the lower end of the second connecting segment 511 and one side surface of the battery cell body 1 is an obtuse angle, and the angle between the upper end of the second connecting segment 511 and one side surface of the battery cell body 1 is an acute angle. Or, the angle between the lower end of the second connecting segment 511 and one side surface of the battery cell body 1 is an acute angle, and the angle between the upper end of the second connecting segment 511 and one side surface of the battery cell body 1 is an obtuse angle. Or, the angle between the lower end of the second connecting segment 511 and one side surface of the battery cell body 1 is an acute angle, and the angle between the upper end of the second connecting segment 511 and one side surface of the battery cell body 1 is an acute angle.

[0060] Such arrangement effectively ensures that there is a gap between the second connecting segment 511 and the battery cell body 1, that is, effectively ensures that there is a gap between the second connecting segment 511 and the second grid line 3 in the front-to-back direction, thereby effectively avoiding a short circuit in the battery cell 100. In addition, the flexibility of the arrangement of the second connecting segment 511 is improved, which is convenient for flexible arrangement according to actual use conditions, thereby improving the applicability of the battery cell 100.

[0061] According to some further embodiments of the present invention, the angle between one end of the first connecting segment 411 and one side surface of the battery cell body 1 is an acute angle, the angle between the other end of the first connecting segment 411 and one side surface of the battery cell body 1 is an acute angle, or the angle between the other end of the first connecting segment 411 and one side surface of the battery cell body 1 is an obtuse angle. At the same time, the angle between one end of the second connecting segment 511 and one side surface of the battery cell body 1 is an acute angle, the angle between the other end of the second connecting segment 511 and one side surface of the battery cell body 1 is an acute angle, or the angle between the other end of the second connecting segment 511 and one side surface of the battery cell body 1 is an obtuse angle. Thus, it is effectively ensured that there is a gap between the first connecting segment 411 and the battery cell body 1, that is, it is effectively ensured that there is a gap between the first connecting segment 411 and the first grid line 2 along the front-to-back direction, and it is effectively ensured that there is a gap between the second connecting segment 511 and the battery cell body 1, that is, it is effectively ensured that there is a gap between the second connecting segment 511 and the second grid line 3 along the front-to-back direction, thereby effectively avoiding short circuit of the battery cell 100. In addition, the flexibility of disposing the first connecting segment 411 and the second connecting segment 511 is improved, so that they can be flexibly arranged according to actual use conditions, thereby improving the applicability of the battery cell 100 .

[0062] According to some embodiments of the present invention, referring to Figure 3 and Figure 4 , the maximum distance between the first connecting section 411 and the above-mentioned one side surface of the battery cell body 1 is h1, wherein h1 satisfies: 0.02mm≤h1≤5mm. For example, when the maximum distance between the first connecting section 411 and the rear side surface of the battery cell body 1 is greater than 5mm, the maximum distance between the first connecting section 411 and the rear side surface of the battery cell body 1 is large. During the manufacturing process of the battery cell 100, after the battery cell 100 is laminated, the first connecting section 411 is squeezed and easily deviates and contacts the first grid line segment 21 to cause a short circuit, thereby affecting the normal use of the battery cell 100. When the maximum distance between the first connecting section 411 and the rear side surface of the battery cell body 1 is less than 0.02mm, the distance between the first connecting section 411 and the rear side surface of the battery cell body 1 is small, and the first connecting section 411 is easy to contact the rear side surface of the battery cell body 1, thereby reducing the anti-short circuit performance of the battery cell 100.

[0063] Thus, by setting the maximum distance h1 between the first connecting section 411 and the above-mentioned one side surface of the battery cell body 1 to satisfy: 0.02mm≤h1≤5mm, the distance between the first connecting section 411 and the battery cell body 1 is set reasonably, so that in the process of manufacturing the battery cell 100, after the battery cell 100 is laminated, the first connecting section 411 is prevented from being offset and contacting the first grid line segment 21 after being squeezed, thereby preventing the battery cell 100 from short-circuiting and extending the service life of the battery cell 100. In addition, the first connecting section 411 is prevented from contacting the rear side of the battery cell body 1, thereby improving the anti-short circuit performance of the battery cell 100. Among them, the maximum distances between the multiple first connecting sections 411 and the battery cell body 1 can be equal or unequal. For example, in the process of producing the battery cell 100, due to the error caused by the processing accuracy, the maximum distances between the multiple first connecting sections 411 and the battery cell body 1 can be non-equidistant, that is, the height of the highest point of each first connecting section 411 along the front-to-back direction can be different.

[0064] According to some other embodiments of the present invention, the maximum distance between the second connecting section 511 and the above-mentioned one side surface of the battery cell body 1 is h2, wherein h2 satisfies: 0.02mm≤h2≤5mm. For example, when the maximum distance between the second connecting section 511 and the rear side surface of the battery cell body 1 is greater than 5mm, the maximum distance between the second connecting section 511 and the rear side surface of the battery cell body 1 is large. During the manufacturing process of the battery cell 100, after the battery cell 100 is laminated, the second connecting section 511 is easily offset after being squeezed and contacts the second grid line segment 31 to cause a short circuit, thereby affecting the normal use of the battery cell 100. When the maximum distance between the second connecting section 511 and the rear side surface of the battery cell body 1 is less than 0.02mm, the distance between the second connecting section 511 and the rear side surface of the battery cell body 1 is small, and the second connecting section 511 is easy to contact the rear side surface of the battery cell body 1, thereby reducing the anti-short circuit performance of the battery cell 100.

[0065] Thus, by setting the maximum distance h2 between the second connecting section 511 and the above-mentioned one side surface of the battery cell body 1 to satisfy: 0.02mm≤h2≤5mm, the distance between the second connecting section 511 and the battery cell body 1 is set reasonably, so that in the process of manufacturing the battery cell 100, after the battery cell 100 is laminated, the second connecting section 511 is prevented from being offset and contacting the second grid line segment 31 after being squeezed, thereby preventing the battery cell 100 from short-circuiting and extending the service life of the battery cell 100. In addition, the second connecting section 511 is prevented from contacting the rear side of the battery cell body 1, thereby improving the short-circuit resistance of the battery cell 100. Among them, the maximum distances between the plurality of second connecting sections 511 and the battery cell body 1 may be equal or unequal. For example, in the process of producing the battery cell 100, due to errors caused by the processing technology or processing accuracy, the maximum distances between the plurality of second connecting sections 511 and the battery cell body 1 may be non-equal distances, that is, the height of the highest point of each second connecting section 511 along the front-to-back direction may be different.

[0066] According to some further embodiments of the present invention, the maximum distance between the first connection section 411 and the side surface of the battery cell body 1 is h1, and the maximum distance between the second connection section 511 and the side surface of the battery cell body 1 is h2, wherein h1 and h2 respectively satisfy: 0.02mm≤h1≤5mm, 0.02mm≤h2≤5mm. Thus, the distances between the first connection section 411 and the second connection line 5 and the rear side surface of the battery cell body 1 are reasonably set, which avoids the first connection section 411 and the second connection section 511 from being offset and short-circuited during the lamination process, thereby extending the service life of the battery cell 100. In addition, it also avoids the first connection section 411 and the second connection section 511 from contacting the rear side surface of the battery cell body 1, thereby improving the anti-short-circuit performance of the battery cell 100.

[0067] Further, refer to Figure 3 and Figure 4 , h1 further satisfies: 0.05mm≤h1≤0.3mm; and / or, h2 further satisfies: 0.05mm≤h2≤0.3mm. For example, the settings of h1 and h2 include the following situations: First, h1 further satisfies: 0.05mm≤h1≤0.3mm. Second, h2 further satisfies: 0.05mm≤h2≤0.3mm. Third, h1 and h2 further satisfy: 0.05mm≤h1≤0.3mm, 0.05mm≤h2≤0.3mm, respectively.

[0068] When h1 is greater than 0.3 mm, the maximum distance between the first connecting segment 411 and the above-mentioned one side surface of the battery cell body 1 is increased, thereby increasing the length of the first connecting segment 411, increasing the material usage of the first connecting segment 411, increasing the production cost of the first connecting segment 411, and increasing the production cost of the battery cell 100. When h1 is less than 0.05 mm, the maximum distance between the first connecting segment 411 and the above-mentioned one side surface of the battery cell body 1 is reduced. The distance is small, and it is difficult to control during the production process, which increases the difficulty of producing the first connecting segment 411, thereby increasing the difficulty of producing the battery cell 100.

[0069] When h2 is greater than 0.3 mm, the maximum distance between the second connecting segment 511 and the above-mentioned one side surface of the battery cell body 1 is increased, thereby increasing the length of the second connecting segment 511, increasing the material usage of the second connecting segment 511, increasing the production cost of the second connecting segment 511, and increasing the production cost of the battery cell 100. When h2 is less than 0.05 mm, the maximum distance between the second connecting segment 511 and the above-mentioned one side surface of the battery cell body 1 is reduced. The distance is small, and it is difficult to control during the production process, which increases the difficulty of producing the second connecting segment 511, thereby increasing the difficulty of producing the battery cell 100.

[0070] Therefore, by setting h1 and h2 to further satisfy: 0.05mm≤h1≤0.3mm, 0.05mm≤h2≤0.3mm, under the condition of ensuring short circuit prevention, the maximum distance between the first connecting section 411 and the above-mentioned one side surface of the battery cell body 1 and the maximum distance between the second connecting section 511 and the above-mentioned one side surface of the battery cell body 1 are reasonably set, thereby shortening the length of the first connecting section 411 and the second connecting section 511, reducing the material consumption of the first connecting section 411 and the second connecting section 511, and reducing the production cost of the battery cell 100. In addition, in the production process, it is easy to control the distance between the first connecting section 411 and the battery cell body 1, and the distance between the second connecting section 511 and the battery cell body 1, thereby reducing the production difficulty of the first connecting section 411 and the second connecting section 511, reducing the production difficulty of the battery cell 100, and improving the production efficiency of the battery cell 100.

[0071] According to some embodiments of the present invention, referring to Figure 5 and Figure 6, a first interconnection portion 43 is formed at the connection between the first connection segment 411 and the first connection component 42, the orthographic projection area of ​​the first interconnection portion 43 on the first connection component 42 is s1, the cross-sectional area of ​​the first connection segment 411 is s2, and the orthographic projection area of ​​the first connection component 42 on the battery cell body 1 is s3, wherein s1, s2 and s3 satisfy: s2<s1≤s3. For example, during the bonding process between the first connection segment 411 and the first connection component 42, the end of the first connection segment 411 connected to the first connection component 42 melts, and the first interconnection portion 43 is formed after melting and solidification. Thus, the connection area between the first connection segment 411 and the first connection component 42 is increased by the first interconnection portion 43, thereby strengthening the connection strength between the first connection segment 411 and the first connection component 42, preventing the first connection segment 411 from falling off the first connection component 42, and improving the use stability of the first electrical connection assembly 4. In addition, the first interconnection portion 43 is prevented from overflowing from the first connection component 42, which reduces the aesthetics of the battery cell 100. Moreover, it is also convenient for one end of the two first connecting segments 411 to form the first interconnecting parts 43 on the same first connecting component 42, thereby effectively ensuring that multiple first connecting segments 411 and multiple first connecting components 42 can be connected in sequence. It should be noted that the two different first interconnecting parts 43 on the same first connecting component 42 can overlap or not overlap, and can be specifically set according to actual use. The two ends of the first connecting segment 411 respectively form the first interconnecting parts 43 with the connection points of the two adjacent first connecting components 42, but it is not limited to this.

[0072] According to other embodiments of the present invention, a second interconnection portion (not shown) is formed at the connection between the second connection segment 511 and the second connection component 52, the orthographic projection area of ​​the second interconnection portion on the second connection component 52 is s4, the cross-sectional area of ​​the second connection segment 511 is s5, and the orthographic projection area of ​​the second connection component 52 on the battery cell body 1 is s6, wherein s4, s5 and s6 satisfy: s5<s4≤s6. For example, during the bonding and welding process of the second connection segment 511 and the second connection component 52, the end portion of the second connection segment 511 connected to the second connection component 52 melts, and the second interconnection portion is formed after melting and solidification.

[0073] Thus, the connection area between the second connection section 511 and the second connection component 52 is increased by the second interconnection part, thereby strengthening the connection strength between the second connection section 511 and the second connection component 52, preventing the second connection section 511 from falling off the second connection component 52, and improving the use stability of the second electrical connection assembly 5. In addition, the second interconnection part is prevented from overflowing the second connection component 52, which reduces the aesthetics of the battery cell 100. Moreover, it is also convenient for one end of the two second connection sections 511 to form a second interconnection part on the same second connection component 52, thereby effectively ensuring that multiple second connection sections 511 and multiple second connection components 52 can be connected in sequence. It should be noted that two different second interconnections on the same second connection component 52 may overlap or not overlap, and can be specifically set according to actual use conditions. The two ends of the second connection section 511 respectively form a second interconnection part with the connection of two adjacent second connection components 52, but it is not limited to this.

[0074] Further, the orthographic projection shape of the first interconnection part 43 on the first connecting part 42 is circular, oblong or polygonal. The orthographic projection shape of the second interconnection part on the second connecting part 52 is circular, oblong or polygonal. Thus, when the cross-sectional shape of the first interconnection part 43 and the cross-sectional shape of the second interconnection part are circular, the cross-sectional area shape of the first interconnection part 43 is adapted to the cross-sectional shape of the first connecting section 411 as circular or elliptical, and the cross-sectional area shape of the second interconnection part is adapted to the cross-sectional shape of the second connecting section 511 as circular or elliptical, which is easy to produce. When the cross-sectional shape of the first interconnection part 43 and the cross-sectional shape of the second interconnection part are oblong or polygonal, the cross-sectional area shape of the first interconnection part 43 is adapted to the cross-sectional shape of the first connecting section 411 as polygonal or wedge-shaped, and the cross-sectional area shape of the second interconnection part is adapted to the cross-sectional shape of the second connecting section 511 as polygonal or wedge-shaped, which is easy to produce. It should be noted that the shape of the first interconnection part 43 and the shape of the second interconnection part can be spherical or wedge-shaped, but are not limited thereto.

[0075] According to some embodiments of the present invention, referring to Figure 1 The first gate line 2 includes a plurality of first gate line segments 21 arranged at intervals along the X direction, the first connecting segment 411 is located between two adjacent first gate line segments 21 of the plurality of first gate lines 2, and the first connecting segment 411 is spaced apart from the ends of the two adjacent first gate line segments 21. The second gate line 3 includes a plurality of second gate line segments 31 arranged at intervals along the X direction, the second connecting segment 511 is located between two adjacent second gate line segments 31 of the plurality of second gate lines 3, and the second connecting segment 511 is spaced apart from the ends of the two adjacent second gate line segments 31.

[0076] For example, in Figure 1In the example, a plurality of first gate line segments 21 are arranged at intervals along the left-right direction, and a plurality of second gate line segments 31 are arranged at intervals along the left-right direction. A plurality of first connecting segments 411 are respectively spaced apart from the ends of the corresponding plurality of first gate line segments 21, that is, a plurality of first connecting segments 411 are respectively insulated from the corresponding plurality of first gate lines 2. A plurality of second connecting segments 511 are respectively spaced apart from the ends of the corresponding plurality of second gate line segments 31, that is, a plurality of second connecting segments 511 are respectively insulated from the corresponding plurality of second gate lines 3. Among them, the first connecting segment 411 of the first electrical connection component 4 is located between two adjacent first gate line segments 21 and is spaced apart from the two adjacent first gate line segments 21. The second connecting segment 511 of the second electrical connection component 5 is located between two adjacent second gate line segments 31 and is spaced apart from the two adjacent second gate line segments 31.

[0077] Such arrangement reduces the amount of material (e.g., silver paste) used for the first grid line 2 and the second grid line 3, thereby reducing the printing cost of the first grid line 2 and the second grid line 3, and further reducing the production cost of the battery cell 100. In addition, the first grid line segment 21 and the second grid line segment 31 have a simple structure and are easy to produce, thereby improving the production cost of the battery cell 100. In addition, by providing a plurality of first grid line segments 21 and second grid line segments 31, the free end of the first grid line segment 21 and the first connecting segment 411 can be separated, so that the first grid line segment 21 is further insulated from the first connecting segment 411. The free end of the second grid line segment 31 is separated from the second connecting segment 511, so that the second grid line segment 31 is further insulated from the second connecting segment 511, further avoiding the occurrence of a short circuit, and improving the reliability of the battery cell 100. It should be noted that compared with the welding strip in the traditional technology, the width of the first connecting section 411 and the second connecting section 511 is smaller, thereby further increasing the distance between the first connecting section 411 and the first gate line 2, and further increasing the distance between the second connecting section 511 and the second gate line 3, thereby effectively avoiding the occurrence of short circuits and further improving the performance of the battery cell 100.

[0078] Or, under the condition of avoiding short circuit, the width of the first connecting segment 411 is small, which can reduce the distance between the ends of the two first gate line segments 21 adjacent to the first connecting segment 411, extend the length of the first gate line segment 21, and improve the current collection capability of the first gate line 2. The width of the second connecting segment 511 is small, which can reduce the distance between the ends of the two second gate line segments 31 adjacent to the second connecting segment 511, extend the length of the second gate line segment 31, and improve the current collection capability of the second gate line 3, thereby improving the photoelectric conversion capability of the battery cell 100.

[0079] According to some embodiments of the present invention, referring to Figure 1 A first disconnection opening 22 is defined between two adjacent first gate line segments 21, and a plurality of first disconnection openings 22 of a plurality of first gate lines 2 are disposed along the Y direction (ie Figure 1 The first connecting member 42 is disposed on the second grid line segment 31, and the first connecting member 42 is opposite to the first disconnection opening 22 along the Y direction. A second disconnection opening 32 is defined between two adjacent second grid line segments 31, and a plurality of second disconnection openings 32 of a plurality of second grid lines 3 are opposite to each other along the Y direction, and a plurality of first disconnection openings 22 and a plurality of second disconnection openings 32 are arranged alternately along the Y direction. The second connecting member 52 is disposed on the first grid line segment 21, and the second connecting member 52 is opposite to the second disconnection opening 32 along the Y direction.

[0080] For example, in Figure 1 In the example, the plurality of first openings 22 of each first gate line 2 are arranged along the X direction (ie Figure 1 The plurality of first disconnected openings 22 of the plurality of first grid lines 2 are arranged in a plurality of rows relatively to each other up and down, and the plurality of rows of the first disconnected openings 22 are arranged in a plurality of rows along the X direction. The plurality of second disconnected openings 32 of each second grid line 3 are arranged in a plurality of rows relatively to each other up and down, and the plurality of rows of the second disconnected openings 32 and the plurality of rows of the first disconnected openings 22 are arranged alternately along the X direction.

[0081] In the case where there is no main busbar on the battery cell 100, the first connecting component 42 is arranged on the side of the second busbar 3 away from the battery cell body 1, the first connecting component 42 and the first disconnection opening 22 are opposite in the vertical direction, and the first connecting segment 411 and the first disconnection opening 22 are opposite in the thickness direction (i.e., the front-back direction) of the battery cell 100. The second connecting component 52 is arranged on the side of the first busbar 2 away from the battery cell body 1, the second connecting component 52 and the second disconnection opening 32 are opposite in the vertical direction, and the second connecting segment 511 and the second disconnection opening 32 are opposite in the thickness direction of the battery cell 100. Among them, the currents on the multiple first busbars 2 on the battery cell body 1 are converged to the multiple second connecting segments 511 through the multiple second connecting components 52, and the currents on the multiple second busbars 3 are converged to the multiple first connecting segments 411 through the multiple first connecting components 42.

[0082] Therefore, by setting the first disconnection opening 22 and the second disconnection opening 32, the multiple first connection segments 411 are separated from the multiple first grid lines 2 by being opposite to the corresponding multiple first disconnection openings 22 along the thickness direction of the battery cell 100, and the multiple second connection segments 511 are separated from the multiple second grid lines 3 by being opposite to the corresponding multiple second disconnection openings 32 along the thickness direction of the battery cell 100. This can achieve insulation without adopting other structures, which is beneficial to the connection between the battery cell 100 and the first connection segment 411 and the second connection segment 511, and also simplifies the production process of the battery cell 100, improves production efficiency, and reduces costs.

[0083] According to some embodiments of the present invention, referring to Figure 1 , the distance between the first connecting segment 411 and the end of the adjacent first gate line segment 21 is L1, wherein L1 satisfies: 0.15mm≤L1≤1.6mm; and / or, the distance between the second connecting segment 511 and the end of the adjacent second gate line segment 31 is L2, wherein L2 satisfies: 0.15mm≤L2≤1.6mm.

[0084] In the case where there is no main grid line on the battery cell 100, the settings of the first connecting segment 411 and the second connecting segment 511 include the following situations: First, the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21 is L1, where L1 satisfies: 0.15mm≤L1≤1.6mm. Second, the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 is L2, where L2 satisfies: 0.15mm≤L2≤1.6mm. Third, the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21 is L1, and the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 is L2, where L1 and L2 respectively satisfy: 0.15mm≤L1≤1.6mm, 0.15mm≤L2≤1.6mm.

[0085] When the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21 is less than 0.15 mm, the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21 is small, and the first connecting segment 411 is easy to contact with the first grid line segment 21, so that the battery cell 100 is prone to short circuit, which is not conducive to the normal use of the battery cell 100. In addition, the difficulty of assembling the first connecting segment 411 and the battery cell body 1 is increased, and the assembly efficiency of the battery cell 100 is reduced. When the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21 is greater than 1.6 mm, the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21 is large, shortening the length of the first grid line segment 21, that is, shortening the length of the first grid line 2, reducing the occupied area of ​​the first grid line 2 on the battery cell body 1, thereby reducing the utilization of the surface of the battery cell body 1, and then reducing the use efficiency of the battery cell 100.

[0086] When the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 is less than 0.15 mm, the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 is small, and the second connecting segment 511 is easy to contact with the second grid line segment 31, so that the battery cell 100 is prone to short circuit, which is not conducive to the normal use of the battery cell 100. In addition, it also increases the difficulty of assembling the second connecting segment 511 and the battery cell body 1, and reduces the assembly efficiency of the battery cell 100. When the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 is greater than 1.6 mm, the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 is large, shortening the length of the second grid line segment 31, that is, shortening the length of the second grid line 3, reducing the area occupied by the second grid line 3 on the battery cell body 1, thereby reducing the utilization of the surface of the battery cell body 1, and then reducing the use efficiency of the battery cell 100.

[0087] Thus, by setting the distance L1 between the first connecting segment 411 and the end of the adjacent first grid line segment 21, and the distance L2 between the second connecting segment 511 and the end of the adjacent second grid line segment 31 to respectively satisfy: 0.15mm≤L1≤1.6mm, 0.15mm≤L2≤1.6mm, the distance between the first connecting segment 411 and the end of the adjacent first grid line segment 21, and the distance between the second connecting segment 511 and the end of the adjacent second grid line segment 31 are reasonably set, thereby avoiding the first connecting segment 411 from contacting the first grid line segment 21, and also avoiding the second connecting segment 511 from contacting the second grid line segment 31, thereby avoiding the short circuit of the battery cell 100, and thus extending the service life of the battery cell 100. In addition, while reducing the material usage of the first grid line 2 and the second grid line 3, the occupied area of ​​the first grid line 2 and the second grid line 3 is guaranteed, which is more conducive to the use of the battery cell 100. In addition, the difficulty of assembling the battery cell body 1 and the first connecting section 411 and the second connecting section 511 is reduced, thereby improving the assembly efficiency of the battery cell 100 .

[0088] According to some embodiments of the present invention, referring to Figure 1 , along the Y direction, both sides of the first connecting component 42 protrude from the two side edges of the second gate line 3 respectively; and / or, along the Y direction, both sides of the second connecting component 52 protrude from the two side edges of the first gate line 2 respectively.

[0089] For example, in Figure 1In the example, the first connecting component 42 and the second connecting component 52 are arranged in the following cases: First, along the Y direction, the two sides of the first connecting component 42 protrude from the two side edges of the second grid line 3. Second, along the Y direction, the two sides of the second connecting component 52 protrude from the two side edges of the first grid line 2. Third, along the Y direction, the two sides of the first connecting component 42 protrude from the two side edges of the second grid line 3. At the same time, along the Y direction, the two sides of the second connecting component 52 protrude from the two side edges of the first grid line 2.

[0090] In the case where there is no main grid line on the battery cell 100, the upper side of the first connecting component 42 protrudes from the upper side of the second grid line 3, and the lower side of the second connecting component 52 protrudes from the lower side of the second grid line 3, that is, the width of the first connecting component 42 is greater than the width of the second grid line 3. The upper side of the second connecting component 52 protrudes from the upper side of the first grid line 2, and the lower side of the second connecting component 52 protrudes from the lower side of the first grid line 2, that is, the width of the second connecting component 52 is greater than the width of the first grid line 2.

[0091] With such arrangement, the first connection component 42 and the second grid line 3 are in full contact along the vertical direction, which increases the contact area between the first connection component 42 and the second grid line 3, improves the current collection capacity of the first electrical connection component 4, and thus improves the photoelectric conversion capacity of the battery cell 100. In addition, the second connection component 52 and the first grid line 2 are in full contact along the vertical direction, which increases the contact area between the second connection component 52 and the first grid line 2, improves the current collection capacity of the second electrical connection component 5, and thus improves the photoelectric conversion capacity of the battery cell 100. It should be noted that, in the process of preparing the battery cell 100, after arranging the plurality of first grid lines 2 and the plurality of second grid lines 3 on the rear side of the battery cell body 1, the plurality of first connection components 42 and the plurality of second connection components 52 are printed on the rear side of the battery cell body 1 respectively, or the plurality of first grid lines 2, the plurality of second grid lines 3, the plurality of first connection components 42 and the plurality of second connection components 52 are printed on the rear side of the battery cell body 1 at the same time. Then, the plurality of first connection segments 411 are sequentially connected to two adjacent first connection components 42 , respectively, and the plurality of second connection segments 511 are sequentially connected to two adjacent second connection components 52 , respectively.

[0092] According to some embodiments of the present invention, a plurality of third gate lines 6 and a plurality of fourth gate lines (not shown) are further provided on the battery cell body 1, and the plurality of third gate lines 6 and the plurality of fourth gate lines are alternately arranged along the X direction, the third gate line 6 is provided between two adjacent first gate line segments 21 of the plurality of first gate lines 2, and the third gate line 6 and the ends of the two adjacent first gate line segments 21 are spaced apart from each other, the third gate line 6 is electrically connected to the plurality of second gate lines 3, respectively, the fourth gate line is provided between two adjacent second gate line segments 31 of the plurality of second gate lines 3, and the ends of the fourth gate line and the two adjacent second gate line segments 31 are spaced apart from each other, the fourth gate line is electrically connected to the plurality of first gate lines 2, respectively, a plurality of first connecting components 42 are spaced apart on a side of the third gate line 6 away from the battery cell body 1, and a plurality of second connecting components 52 are spaced apart on a side of the fourth gate line away from the battery cell body 1.

[0093] For example, a plurality of third grid lines 6 are separated from the free ends of the corresponding plurality of first grid line segments 21 to achieve insulation, and a plurality of third grid lines 6 are electrically connected to a plurality of second grid lines 3 (for example, they can be electrically connected by screen printing or welding). A plurality of fourth grid lines are separated from the free ends of the corresponding plurality of second grid line segments 31 to achieve insulation, and a plurality of fourth grid lines are electrically connected to a plurality of first grid lines 2 (for example, they can be electrically connected by screen printing or welding). It should be noted that the first connecting component 42 is electrically connected to the third grid line 6 by screen printing, welding or bonding. The second connecting component 52 is electrically connected to the fourth grid line by screen printing, welding or bonding. It should be noted that the third grid line 6 and the fourth grid line are respectively main grid lines, wherein the polarity of the third grid line 6 is the same as the polarity of the second grid line 3, and the polarity of the fourth grid line is the same as the polarity of the first grid line 2.

[0094] With such arrangement, the current on the battery cell 100 can be collected through the third grid line 6, and then the current on the battery cell 100 is collected through the first connecting component 42 and the first connecting segment 411. The current on the battery cell 100 can be collected through the fourth grid line, and then the current on the battery cell 100 is collected through the second connecting component 52 and the second connecting segment 511. Moreover, the current on the second grid line 3 can also be introduced to the first connecting component 42 through the third grid line 6, and the current on the first grid line 2 can also be introduced to the second connecting component 52 through the fourth grid line, thereby improving the current collection capability of the battery cell 100, and avoiding short circuit of the battery cell 100, so that the battery cell 100 can be used normally for a long time. It should be noted that, during the preparation of the battery cell 100, after a plurality of first grid lines 2, a plurality of second grid lines 3, a plurality of third grid lines 6 and a plurality of fourth grid lines are arranged on the battery cell body 1, a plurality of first connecting components 42 and a plurality of second connecting components 52 are respectively printed on a side of the plurality of third grid lines 6 and the plurality of fourth grid lines away from the battery cell body 1, and then a plurality of first connecting segments 411 are respectively connected to a plurality of adjacent two first connecting components 42 in turn, and a plurality of second connecting segments 511 are respectively connected to a plurality of adjacent two second connecting components 52 in turn.

[0095] Optionally, a portion of the plurality of third grid lines 6 and a portion of the plurality of fourth grid lines are respectively embedded in the above-mentioned one side surface of the cell body 1. Such an arrangement increases the contact area between the third grid lines 6 and the cell body 1, and increases the contact area between the fourth grid lines and the cell body 1, thereby improving the ability of the third grid lines 6 and the fourth grid lines to collect electrons, and further improving the photoelectric conversion ability of the cell 100.

[0096] According to some embodiments of the present invention, referring to Figure 2 A first disconnection opening 22 is defined between two adjacent first gate line segments 21, and multiple first disconnection openings 22 of multiple first gate lines 2 are respectively opposite to each other along the Y direction. The first connecting component 42 is located on the third gate line 6 at the first disconnection opening 22, or the first connecting component 42 is located at the connection between the third gate line 6 and the second gate line 3; and / or, the second connecting component 52 is located on the fourth gate line at the second disconnection opening 32, or the second connecting component 52 is located at the electrical connection between the fourth gate line and the first gate line 2.

[0097] For example, in Figure 2In the example of , the arrangement of the first connecting component 42 and the second connecting component 52 includes the following situations: First, the first connecting component 42 is located on the third gate line 6 at the first disconnection port 22, or the first connecting component 42 is located at the connection between the third gate line 6 and the second gate line 3. Second, the second connecting component 52 is located on the fourth gate line at the second disconnection port 32, or the second connecting component 52 is located at the electrical connection between the fourth gate line and the first gate line 2. Third, the first connecting component 42 is located on the third gate line 6 at the first disconnection port 22, or the first connecting component 42 is located at the connection between the third gate line 6 and the second gate line 3. At the same time, the second connecting component 52 is located on the fourth gate line at the second disconnection port 32, or the second connecting component 52 is located at the electrical connection between the fourth gate line and the first gate line 2.

[0098] Thus, when the first connecting member 42 is located on the third grid line 6 at the first disconnection port 22, the first connecting member 42 is isolated from the first grid line segment 21 to achieve insulation. When the first connecting member 42 is located at the connection between the third grid line 6 and the second grid line 3, it is easy to arrange the first connecting member 42, so that it is easy to process. Wherein, in both cases, the current can be introduced into the first connecting member 42 through the third grid line 6, so that the battery cell 100 can be used normally for a long time. In addition, when the second connecting member 52 is located on the fourth grid line at the second disconnection port 32, the second connecting member 52 is isolated from the second grid line segment 31 to achieve insulation. When the second connecting member 52 is located at the connection between the fourth grid line and the first grid line 2, it is easy to arrange the second connecting member 52, so that it is easy to process. Wherein, in both cases, the current can be introduced into the second connecting member 52 through the fourth grid line, so that the battery cell 100 can be used normally for a long time. In addition, when multiple first connecting components 42 are arranged on the same third grid line 6, they can be arranged at equal intervals or unequal intervals. When multiple second connecting components 52 are arranged on the same fourth grid line, they can be arranged at equal intervals or unequal intervals. The distance between two adjacent first connecting components 42 and the distance between two adjacent second connecting components 52 arranged in the up and down directions can be equal or unequal, that is, multiple first connecting components 42 and multiple second connecting components 52 in the left and right directions can be on the same horizontal line or on different horizontal lines, so that the number and arrangement of multiple first connecting components 42 and multiple second connecting components 52 can be specific to actual usage, thereby improving the flexibility of the arrangement of multiple first connecting components 42 and multiple second connecting components 52 and improving the adaptability of the battery cell 100.

[0099] According to some embodiments of the present invention, the first connecting section 411 and / or the first connecting component 42 is a metal part, an alloy part or a plated metal part; and / or the second connecting section 511 and / or the second connecting component 52 is a metal part, an alloy part or a plated metal part. For example, the configuration of the first electrical connection component 4 and the second electrical connection component 5 includes the following situations: First, the first connecting section 411 and / or the first connecting component 42 is a metal part, an alloy part or a plated metal part. Second, the second connecting section 511 and / or the second connecting component 52 is a metal part, an alloy part or a plated metal part. Third, the first connecting section 411 and / or the first connecting component 42 is a metal part, an alloy part or a plated metal part, and the second connecting section 511 and / or the second connecting component 52 is a metal part, an alloy part or a plated metal part. Among them, the first connecting section 411 is a metal part, an alloy part or a plated metal part, the first connecting component 42 is a metal part, an alloy part or a plated metal part, the second connecting section 511 is a metal part, an alloy part or a plated metal part, and the second connecting component 52 is a metal part, an alloy part or a plated metal part. Therefore, the metal part, the alloy part and the plated metal part have good conductivity and ductility, so that the first electrical connection component 4 and the second electrical connection component 5 are easy to process, thereby improving the production efficiency of the battery cell 100. And it can achieve the function of collecting current, so that the battery cell 100 can be used normally.

[0100] According to some embodiments of the present invention, the metal includes Au, Al, Cu, Ag or Ni. Therefore, Au, Al, Cu, Ag or Ni has good electrical conductivity, bonding, tendency to form intermetallic compounds (IMC) and Kirkendall effect, corrosion resistance, hardness, thermal expansion coefficient and other properties, which helps to improve the bonding performance between the first connecting section 411 and the first connecting part 42, and also improves the bonding performance between the second connecting section 511 and the second connecting part 52, thereby improving the connection accuracy between the first connecting section 411 and the first connecting part 42, and improving the connection accuracy between the second connecting section 511 and the second connecting part 52. Among them, the high-precision connection is due to the plastic deformation of the first connecting section 411 and the mechanical interlocking between the first connecting part 42, the plastic deformation of the second connecting section 511 and the mechanical interlocking between the second connecting part 52, and rarely forms intermetallic compounds. For example, the first connecting section 411 and the second connecting section 511 are copper pieces, the first connecting part 42 and the second connecting part 52 are silver pieces, and the third grid line 6 and the fourth grid line are silver pieces.

[0101] According to some embodiments of the present invention, a first protective layer (not shown in the figure) is provided on the outer peripheral surface of the first connecting section 411 and / or the first connecting component 42; and / or a second protective layer (not shown in the figure) is provided on the outer peripheral surface of the second connecting section 511 and / or the second connecting component 52.

[0102] For example, the first electrical connection component 4 and the second electrical connection component 5 are provided in the following cases: First, a first protective layer is provided on the outer circumference of the first connection section 411 and / or the first connection component 42. Second, a second protective layer is provided on the outer circumference of the second connection section 511 and / or the second connection component 52. Third, a first protective layer is provided on the outer circumference of the first connection section 411 and / or the first connection component 42. At the same time, a second protective layer is provided on the outer circumference of the second connection section 511 and / or the second connection component 52.

[0103] With such a configuration, when the bonding ability between the first connection section 411 and the first connection component 42 is poor, the bonding ability between the first connection section 411 and the first connection component 42 can be enhanced by the first protective layer on the outer circumference of the first connection section 411 and / or the first connection component 42, so that bonding is easy or the bonding effect is better. In addition, when the bonding ability between the second connection section 511 and the second connection component 52 is poor, the bonding ability between the second connection section 511 and the second connection component 52 can be enhanced by the second protective layer on the outer circumference of the second connection section 511 and / or the second connection component 52, so that bonding is easy or the bonding effect is better. In addition, the first protective layer on the outer circumference of the first connection section 411 and the first connection component 42 can protect the first connection section 411 and the first connection component 42 respectively, and the second protective layer on the outer circumference of the second connection section 511 and the second connection component 52 can protect the second connection section 511 and the second connection component 52 respectively, thereby avoiding corrosion and extending the service life. It should be noted that the material of the first protective layer and the second protective layer can be Sn, Pb or Bi, so as to improve the physical or chemical properties such as strength and corrosion resistance of the first electrical connection component 4 and the second electrical connection component 5. But not limited to this. Among them, the first protective layer and the second protective layer are formed by surface treatment. The first connecting component 42 and the second connecting component 52 can form a multi-layer structure respectively.

[0104] According to some embodiments of the present invention, the first connecting section 411 and the first connecting component 42 are integrated into an integral structure through a bonding process; and / or the second connecting section 511 and the second connecting component 52 are integrated into an integral structure through a bonding process.

[0105] For example, the first electrical connection component 4 and the second electrical connection component 5 are arranged in the following cases: First, the first connection section 411 and the first connection component 42 are integrated into an integral structure by a bonding process. Second, the second connection section 511 and the second connection component 52 are integrated into an integral structure by a bonding process. Third, the first connection section 411 and the first connection component 42 are integrated into an integral structure by a bonding process, and the second connection section 511 and the second connection component 52 are integrated into an integral structure by a bonding process.

[0106] Thus, the end of the first connection segment 411 is prevented from falling off from the first connection component 42, and the end of the second connection segment 511 is prevented from falling off from the second connection component 52, thereby enhancing the use stability of the first electrical connection component 4 and the second electrical connection component 5, and improving the use stability of the battery cell 100. In addition, the difficulty of forming the first electrical connection component 4 and the second electrical connection component 5 is reduced, and the production efficiency of the first electrical connection component 4 and the second electrical connection component 5 is improved.

[0107] Optionally, when both ends of the first connecting segment 411 are respectively connected to two adjacent first connecting components 42, the connection between the upper end of the first connecting segment 411 (i.e., the head of the first connecting segment 411) and the corresponding first connecting component 42 forms a first interconnecting portion 43, and the connection between the lower end of the first connecting segment 411 (i.e., the tail of the first connecting segment 411) and the corresponding first connecting component 42 forms a first interconnecting member 44 (i.e., Figure 6 As shown). When the two ends of the second connecting section 511 are connected to the two adjacent second connecting parts 52, the above-mentioned upper end of the second connecting section 511 (i.e., the head of the second connecting section 511) and the connection of the corresponding second connecting part 52 form a second interconnection part, and the above-mentioned lower end of the second connecting section 511 (i.e., the tail of the second connecting section 511) and the connection of the corresponding second connecting part 52 form a second interconnection member (not shown in the figure). The first interconnection member 44 and the second interconnection member can be point structures respectively. As a result, the structure of the first interconnection member 44 and the second interconnection member is simple and easy to form, which improves the production efficiency of the first electrical connection component 4 and the second electrical connection component 5, and improves the production efficiency of the battery cell 100. It should be noted that the first interconnection portion 43 and the first interconnection member 44 on the same first connecting part 42 are spaced apart along the Y direction, and the second interconnection portion and the second interconnection member on the same second connecting part 52 are spaced apart along the Y direction, but it is not limited to this.

[0108] Among them, Figure 6 As shown, when the first interconnecting portion 43 and the second interconnecting portion are spherical, the maximum width of the first connecting segment 41 is d1, the maximum width of the second connecting segment 51 is d2, the diameter of the first interconnecting portion 43 is d3, and the diameter of the second interconnecting portion is d4, wherein d1, d2, d3 and d4 respectively satisfy: 2.5≤d3 / d1≤5, 2.5≤d4 / d2≤5.

[0109] For example, when d3 / d1 is less than 2.5, the diameter of the first interconnection 43 is small, which reduces the contact area between the first interconnection 43 and the first connection component 42, thereby reducing the connection stability between the first interconnection 43 and the first connection component 42. When d3 / d1 is greater than 5, the diameter of the first interconnection 43 is large, which increases the material usage of the first interconnection 43 and increases the production cost of the first electrical connection assembly 4.

[0110] When d4 / d2 is less than 2.5, the diameter of the second interconnection is small, which reduces the contact area between the second interconnection and the second connection component 52, thereby reducing the connection stability between the second interconnection and the second connection component 52. When d4 / d2 is greater than 5, the diameter of the second interconnection is large, which increases the material usage of the second interconnection and increases the production cost of the second electrical connection assembly 5.

[0111] Therefore, by setting d1, d2, d3 and d4 to respectively satisfy: 2.5≤d3 / d1≤5, 2.5≤d4 / d2≤5, the ratio of the diameter d3 of the first interconnection part 43 to the maximum width d1 of the first connection segment 41 is reasonably set, and the ratio of the diameter d4 of the second interconnection part to the maximum width d2 of the second connection segment 51 is reasonably set. The diameter of the first interconnection part 43 and the diameter of the second interconnection part are relatively large, which increases the contact area between the first interconnection part 43 and the first connection component 42, improves the connection stability between the first interconnection part 43 and the first connection component 42, that is, improves the connection stability between the first connection segment 411 and the first connection component 42, and also increases the contact area between the second interconnection part and the second connection component 52, improves the connection stability between the second interconnection part and the second connection component 52, that is, improves the connection stability between the second connection segment 511 and the second connection component 52, thereby improving the use stability of the first electrical connection component 4 and the second electrical connection component 5, which is beneficial to the long-term normal use of the battery cell 100. In addition, the material usage of the first interconnection part 43 and the second interconnection part is reduced, thereby reducing the material usage of the first electrical connection component 4 and the second electrical connection component 5, reducing the production cost of the first electrical connection component 4 and the second electrical connection component 5, and further reducing the production cost of the battery cell 100.

[0112] like Figure 5 As shown, when the first interconnection portion 43 and the second interconnection portion are wedge-shaped respectively, the maximum width of the first connecting segment 41 is d1, the maximum width of the second connecting segment 51 is d2, the width of the first interconnection portion 43 along the X direction is d5, and the width of the second interconnection portion along the X direction is d6, wherein d1, d2, d5 and d6 respectively satisfy: 2μm≤d5-d1≤10μm, 2μm≤d6-d2≤10μm.

[0113] In this way, the difference between the width d5 ​​of the first interconnection 43 and the maximum width d1 of the first connection section 41 is reasonably set, and the difference between the width d6 of the second interconnection and the maximum width d2 of the second connection section 51 is reasonably set, so that the width of the first interconnection 43 and the width of the second interconnection are relatively large, the contact area between the first interconnection 43 and the first connection component 42 is increased, and the connection stability between the first interconnection 43 and the first connection component 42 is improved, that is, the connection stability between the first connection section 411 and the first connection component 42 is improved, and the contact area between the second interconnection and the second connection component 52 is increased, and the connection stability between the second interconnection and the second connection component 52 is improved, that is, the connection stability between the second connection section 511 and the second connection component 52 is improved, so that the battery cell 100 is used normally for a long time. In addition, the material consumption of the first interconnection 43 and the second interconnection is reduced, thereby reducing the material consumption of the first electrical connection component 4 and the second electrical connection component 5, reducing the production cost of the first electrical connection component 4 and the second electrical connection component 5, and further reducing the production cost of the battery cell 100. It should be noted that the length of the first connecting component 42 is greater than the length of the first interconnecting portion 43, wherein the length of the first interconnecting portion 43 and the length of the first connecting component 42 refer to the length along the Y direction, that is, the direction in which the first electrical connection component 4 extends. The length of the second connecting component 52 is greater than the length of the second interconnecting portion, wherein the length of the second interconnecting portion and the length of the second connecting component 52 refer to the length along the Y direction, that is, the direction in which the second electrical connection component 5 extends.

[0114] According to some optional embodiments of the present invention, referring to Figure 3 and Figure 4 The cell body 1 includes a first layer 11, a second layer 12, a third layer 13, a fourth layer 14, a fifth layer 15 and a sixth layer 16 which are arranged in sequence along the thickness direction of the cell 100. The first layer 11 is located on the front side of the cell body 1 (i.e., the light-receiving side of the cell body 1), and the sixth layer 16 is located on the rear side of the cell body (i.e., the backlight side of the cell body 1). The first grid line 2, the second grid line 3, the third grid line 6, the fourth grid line, the first connecting component 42 and the second connecting component 52 are all arranged on the side of the sixth layer 16 away from the fifth layer 15. The first layer 11 is SiN x The second layer 12 is SiO2, the third layer 13 is n+FSF, the fourth layer 14 is n-type Si, the fifth layer 15 is the Poly region and the Gap region, and the sixth layer 16 is SiN x Among them, the sixth layer 16 is an insulating layer, the third layer 13 is a positive surface field, and the second layer 12 and the first layer 11 are passivation regions. With such a configuration, the battery cell body 1 has a simple structure and is easy to process, thereby improving the production efficiency of the battery cell 100. In addition, the production requirements of the back contact battery cell 100 are also met.

[0115] According to the battery string 200 of the second embodiment of the present invention, Figure 7 , comprising a plurality of battery cells 100 according to the first embodiment of the present invention, wherein the plurality of battery cells 100 are electrically connected via a plurality of first electrical connection components 4 and a plurality of second electrical connection components 5. For example, Figure 7 In the example, the first battery cell 100 and the second battery cell 100 are arranged at intervals in the vertical direction and are electrically connected through a plurality of first electrical connection components 4 and a plurality of second electrical connection components 5. In this way, the current on the plurality of battery cells 100 can be collected through the plurality of first electrical connection components 4 and the plurality of second electrical connection components 5, thereby improving the current collection capacity of the battery string 200. In addition, short circuits in the battery string 200 are avoided, the processing technology of the battery string 200 is simplified, and the production cost of the battery string 200 is reduced.

[0116] According to some embodiments of the present invention, referring to Figure 7 , the second grid lines 3 between two adjacent battery cells 100 are electrically connected through a plurality of first electrical connection components 4, and the first grid lines 2 between two adjacent battery cells 100 are electrically connected through a plurality of second electrical connection components 5. For example, in Figure 7 In the example, the same first electrical connection component 4 is electrically connected to the plurality of second grid lines 3 on the plurality of battery cells 100 that are opposite to each other in the vertical direction, and the same second electrical connection component 5 is electrically connected to the plurality of first grid lines 2 on the plurality of battery cells 100 that are opposite to each other in the vertical direction. Wherein, in the case of the third grid line 6 and the fourth grid line, the same first electrical connection component 4 is electrically connected to the third grid line 6 on the plurality of battery cells 100 that are opposite to each other in the vertical direction, and the same second electrical connection component 5 is electrically connected to the fourth grid line on the plurality of battery cells 100 that are opposite to each other in the vertical direction. With such a configuration, the first electrical connection component 4 can collect the current on the plurality of second grid lines 3 and / or the third grid line 6, and the second electrical connection component 5 can collect the current on the plurality of first grid lines 2 and / or the fourth grid line, so that the battery string 200 can be used normally for a long time.

[0117] The photovoltaic module according to the third embodiment of the present invention comprises the battery cell 100 according to the first embodiment of the present invention, or the battery string 200 according to the second embodiment of the present invention.

[0118] According to the photovoltaic module of the present invention, by using the above-mentioned cell sheet 100 or the above-mentioned cell string 200, short circuit of the photovoltaic module is avoided, the processing technology of the photovoltaic module is simplified, and the production cost of the photovoltaic module is reduced. The photovoltaic module also includes glass, film, back plate, junction box and frame to complete the photovoltaic module assembly.

[0119] The photovoltaic power generation system according to the fourth embodiment of the present invention comprises the solar cell 100 according to the first embodiment of the present invention, or the photovoltaic module according to the third embodiment of the present invention.

[0120] According to the photovoltaic power generation system of the present invention, by using the above-mentioned cell sheet 100, the above-mentioned cell string 200 or the above-mentioned photovoltaic module, short circuit of the photovoltaic power generation system is avoided, the performance of the photovoltaic power generation system is improved, the processing technology of the photovoltaic power generation system is simplified, and the production cost of the photovoltaic power generation system is reduced.

[0121] Other structures and operations of the electric gear blade 100, the battery string 200, the photovoltaic module and the photovoltaic power generation system according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0122] In the description of the present invention, it is to be understood that the terms “center”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0123] 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 present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0124] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art 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: A battery cell body, wherein a plurality of first grid lines and a plurality of second grid lines are arranged on one side surface of the battery cell body, the plurality of first grid lines and the plurality of second grid lines are alternately arranged along the Y direction, and the polarities of the first grid lines and the second grid lines are opposite; a plurality of first electrical connection components, wherein the first electrical connection components include first connection wires; a plurality of second electrical connection components, wherein the second electrical connection components include second connection wires; A plurality of the first connection lines and a plurality of the second connection lines are alternately arranged along the X direction, there is a gap between the first connection line and the one side surface of the battery cell body along the Z direction, and there is a gap between the first connection line and the first gate line along the Z direction, the first connection line is electrically connected to the plurality of the second gate lines respectively, there is a gap between the second connection line and the one side surface of the battery cell body along the Z direction, and there is a gap between the second connection line and the second gate line along the Z direction, the second connection line is electrically connected to the plurality of the first gate lines respectively, and the Y direction, the X direction and the Z direction are perpendicular to each other.

2. The battery cell according to claim 1, characterized in that: The first connecting line includes a plurality of first connecting segments, the first electrical connection assembly also includes a plurality of first connecting components, the plurality of first connecting segments and the plurality of first connecting components are electrically connected in sequence, and the plurality of first connecting components are electrically connected to the plurality of second gate lines respectively; The second connecting line includes a plurality of second connecting segments, the second electrical connection assembly also includes a plurality of second connecting components, the plurality of second connecting segments and the plurality of second connecting components are electrically connected in sequence, and the plurality of second connecting components are electrically connected to the plurality of first gate lines respectively.

3. The battery cell according to claim 2, characterized in that: The maximum width of the first connecting section is d1, wherein d1 satisfies: 0.01 mm ≤ d1 ≤ 0.2 mm; and / or, The maximum width of the second connecting section is d2, wherein d2 satisfies: 0.01 mm≤d2≤0.2 mm.

4. The battery cell according to claim 3, characterized in that: The cross-sectional shape of the first connecting section includes a circle, an ellipse, a polygon or a wedge; and / or, The cross-sectional shape of the second connecting segment includes a circle, an ellipse, a polygon or a wedge.

5. The battery cell according to claim 2, characterized in that: The angle between one end of the first connecting section and the one side surface of the battery cell body is an acute angle, the angle between the other end of the first connecting section and the one side surface of the battery cell body is an acute angle, or the angle between the other end of the first connecting section and the one side surface of the battery cell body is an obtuse angle; and / or, The angle between one end of the second connecting segment and the one side surface of the battery cell body is an acute angle, the angle between the other end of the second connecting segment and the one side surface of the battery cell body is an acute angle, or the angle between the other end of the second connecting segment and the one side surface of the battery cell body is an obtuse angle.

6. The battery cell according to claim 2, characterized in that: The maximum distance between the first connecting section and the one side surface of the battery cell body is h1, wherein h1 satisfies: 0.02mm≤h1≤5mm; and / or, The distance between the highest point of the second connecting section and the battery cell is h2, wherein h2 satisfies: 0.02mm≤h2≤5mm.

7. The battery cell according to claim 6, characterized in that: The h1 further satisfies: 0.05 mm ≤ h1 ≤ 0.3 mm; and / or, The h2 further satisfies: 0.05mm≤h2≤0.3mm.

8. The battery cell according to claim 2, characterized in that: A first interconnection portion is formed at the connection between the first connection section and the first connection component, the orthographic projection area of ​​the first interconnection portion on the first connection component is s1, the cross-sectional area of ​​the first connection section is s2, and the orthographic projection area of ​​the first connection component on the battery cell body is s3, wherein s1, s2 and s3 satisfy: s2<s1≤ s3; and / or, A second interconnection portion is formed at the connection between the second connection section and the second connection component, the orthographic projection area of ​​the second interconnection portion on the second connection component is s4, the cross-sectional area of ​​the second connection section is s5, and the orthographic projection area of ​​the second connection component on the battery cell body is s6, wherein s4, s5 and s6 satisfy: s5<s4≤ s6.

9. The battery cell according to claim 8, characterized in that: The orthographic projection shape of the first interconnecting portion on the first connecting component is a circle, an oblong, or a polygon; The orthographic projection shape of the second interconnecting portion on the second connecting component is a circle, an oblong circle or a polygon.

10. The battery cell according to claim 2, characterized in that: The first gate line includes a plurality of first gate line segments arranged at intervals along the X direction, the first connecting segment is located between two adjacent first gate line segments of the plurality of first gate lines, and the first connecting segment is spaced apart from ends of the two adjacent first gate line segments; The second gate line includes a plurality of second gate line segments arranged at intervals along the X direction, the second connecting segment is located between two adjacent second gate line segments of the plurality of second gate lines, and the second connecting segment is spaced apart from ends of two adjacent second gate line segments.

11. The battery cell according to claim 10, characterized in that: A first disconnection opening is defined between two adjacent first gate line segments, and the first disconnections of the first gate lines are opposite to each other along the Y direction. The first connecting component is provided on the second gate line segment, and the first connecting component is opposite to the first disconnection opening along the Y direction. A second break opening is defined between two adjacent second gate line segments, and multiple second break openings of multiple second gate lines are opposite to each other along the Y direction, and multiple first break openings and multiple second break openings are alternately arranged along the Y direction. The second connecting component is provided on the first gate line segment, and the second connecting component and the second break opening are opposite to each other along the Y direction.

12. The battery cell according to claim 11, characterized in that: The distance between the first connecting segment and the end of the adjacent first gate line segment is L1, wherein L1 satisfies: 0.15 mm ≤ L1 ≤ 1.6 mm; and / or, A distance between the second connecting segment and an end of an adjacent second gate line segment is L2, wherein L2 satisfies: 0.15 mm≤L2≤1.6 mm.

13. The battery cell according to claim 2, characterized in that: Along the Y direction, two sides of the first connecting component protrude from two side edges of the second gate line respectively; and / or, Along the Y direction, two sides of the second connecting component protrude from two side edges of the first gate line respectively.

14. The battery cell according to claim 10, characterized in that: The battery cell body is further provided with a plurality of third gate lines and a plurality of fourth gate lines, the plurality of third gate lines and the plurality of fourth gate lines are alternately arranged along the X direction, the third gate line is provided between two adjacent first gate line segments of the plurality of first gate lines, and the third gate line is spaced apart from ends of two adjacent first gate line segments, and the third gate line is electrically connected to the plurality of second gate lines respectively. The fourth gate line is disposed between two adjacent second gate line segments of the plurality of second gate lines, and ends of the fourth gate line and two adjacent second gate line segments are spaced apart from each other, and the fourth gate line is electrically connected to the plurality of first gate lines respectively. A plurality of the first connection components are arranged at intervals on a side of the third grid line away from the battery cell body, and a plurality of the second connection components are arranged at intervals on a side of the fourth grid line away from the battery cell body.

15. The battery cell according to claim 14, characterized in that: A first disconnection opening is defined between two adjacent first gate line segments, and the first disconnections of the plurality of first gate lines are respectively opposite to each other along the Y direction, and the first connecting component is located on the third gate line at the first disconnection opening, or the first connecting component is located at the connection between the third gate line and the second gate line; and / or, The second connecting component is located on the fourth gate line at the second opening, or the second connecting component is located at a location where the fourth gate line is electrically connected to the first gate line.

16. The battery cell according to claim 2, characterized in that: The first connecting section and / or the first connecting component is a metal part, an alloy part or a plated metal part; and / or, The second connecting section and / or the second connecting component is a metal part, an alloy part or a plated metal part.

17. The battery cell according to claim 16, characterized in that: The metal includes Au, Al, Cu, Ag or Ni.

18. The battery cell according to claim 2, characterized in that: A first protective layer is provided on the outer circumference of the first connecting section and / or the first connecting component; and / or, A second protective layer is provided on the outer circumferential surface of the second connecting section and / or the second connecting component.

19. The battery cell according to any one of claims 2 to 18, characterized in that: The first connecting section and the first connecting component are bonded into an integrated structure; and / or, The second connecting section and the second connecting component are bonded into an integrated structure.

20. A battery string, characterized in that: It comprises a plurality of battery cells according to any one of claims 1 to 19, wherein the plurality of battery cells are electrically connected through a plurality of the first electrical connection components and a plurality of the second electrical connection components.

21. The battery string according to claim 20, characterized in that: The second gate lines between two adjacent battery cells are electrically connected via a plurality of the first electrical connection components, and the first gate lines between two adjacent battery cells are electrically connected via a plurality of the second electrical connection components.

22. A photovoltaic module, characterized in that: The method comprises the battery cell according to any one of claims 1 to 20, or the battery string according to claim 21.

23. A photovoltaic power generation system, characterized in that: It comprises the cell sheet according to any one of claims 1 to 20, or the cell string according to claim 21, or the photovoltaic module according to claim 22.

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