Solar cells, solar strings, photovoltaic modules and photovoltaic power generation systems

Abstract

The present invention discloses a battery cell, a battery string, a photovoltaic module and a photovoltaic power generation system. The battery cell includes a body, a plurality of first grid lines, a plurality of second grid lines, a plurality of first connectors and a plurality of second connectors. A plurality of first grooves and a plurality of second grooves are formed on a side surface of the body. The plurality of first grid lines are arranged on a side surface of the body. The plurality of second grid lines are arranged in the plurality of second grooves respectively. The first grid line includes a plurality of first grid line segments. The first groove is located between two adjacent first grid line segments. The plurality of first connectors are arranged in the plurality of first grooves respectively. The plurality of first connectors are electrically connected to the plurality of second grid lines respectively. The second connector is arranged on a side of the first grid line away from the body. The plurality of second connectors are electrically connected to the plurality of first grid lines respectively. According to the battery cell of the present invention, the arrangement of the first groove and the second groove avoids short circuit of the battery cell, prolongs the service life of the battery cell, and also improves the power of the battery cell.

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, multiple secondary grid lines and multiple welding strips on a battery require that the secondary grid lines and welding strips of the same polarity be welded, and the secondary grid lines and welding strips of different polarities be insulated. However, during the welding process of the welding strips, when the welding strips are offset, the welding strips are easy to overlap with the adjacent secondary grid lines of different polarities, causing a short circuit in the battery, thereby affecting the normal use of the battery. 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 object of the present invention is to provide a battery cell, wherein the arrangement of the first groove and the second groove avoids short circuit of the battery cell, prolongs the service life of the battery cell, and also increases the power of the battery cell.

[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 an embodiment of the first aspect of the present invention, a battery cell comprises: a body, a plurality of first grooves and a plurality of second grooves are formed on one side surface of the body, the plurality of first grooves are arranged at intervals along the first direction, the first grooves extend along the second direction, the plurality of second grooves are arranged at intervals along the second direction, and the second grooves extend along the first direction; a plurality of first gate lines and a plurality of second gate lines, the plurality of first gate lines are arranged on the one side surface of the body, the plurality of second gate lines are respectively arranged in the plurality of second grooves, the plurality of first gate lines and the plurality of second gate lines are alternately arranged at intervals along the second direction, the first gate lines and the second gate lines have opposite polarities, the first gate lines include a plurality of first gate line segments arranged at intervals along the first direction, the first grooves are located between two adjacent first gate line segments; a plurality of first connectors and a plurality of second connectors, the plurality of first connectors and the plurality of second connectors are alternately arranged at intervals along the first direction, the plurality of first connectors are respectively arranged in the plurality of first grooves, the plurality of first connectors are electrically connected to the plurality of second gate lines respectively, the second connectors are arranged on a side of the first gate line away from the body, and the plurality of second connectors are electrically connected to the plurality of first gate lines respectively.

[0009] According to the solar cell of the present invention, the second groove is provided so that the second connector and the second grid line are spaced along the thickness direction of the body to achieve insulation and avoid short circuit. In addition, the first connector is placed in the first groove, and the side wall of the first groove limits the first connector so that the first connector can only be electrically connected to the second grid line on the front side of the first connector, avoiding the first connector from being offset and contacting the first grid line segment during welding, further avoiding short circuit in the solar cell. In addition, the distance from the carrier on the body to the second grid line is reduced, the body resistance is reduced, the electron collection capacity of the second grid line is enhanced, the power of the solar cell is increased, and the power of the photovoltaic module is increased. Moreover, the use of other components (such as insulating glue) is reduced, and the production cost of the solar cell is reduced.

[0010] According to some embodiments of the present invention, the second gate line includes a plurality of second gate line segments arranged at intervals along the second direction, the second connecting member is located between two adjacent second gate line segments of the plurality of second gate lines, and the second connecting member is spaced apart from ends of the two adjacent second gate line segments.

[0011] According to some embodiments of the present invention, the width of the first groove is w1, and the depth of the first groove is h1, wherein w1 and h1 respectively satisfy: 150 μm≤w1≤500 μm, 10 μm≤h1≤30 μm.

[0012] According to some embodiments of the present invention, the width of the second groove is w2, and the depth of the second groove is h2, wherein w2 and h2 respectively satisfy: 50 μm≤w2≤100 μm, 5 μm≤h2≤30 μm.

[0013] According to some embodiments of the present invention, an end surface of the first gate line segment adjacent to the first groove is spaced apart from a corresponding sidewall of the first groove.

[0014] According to some embodiments of the present invention, a distance between the end surface of the first gate line segment adjacent to the first groove and the corresponding sidewall of the first groove is d, wherein d satisfies: 0<d≤500 μm.

[0015] According to some embodiments of the present invention, the first connecting member is connected to a side of the second gate line close to the one side surface of the body.

[0016] According to some embodiments of the present invention, a portion of the second gate line is located in the second groove, and another portion of the second gate line protrudes from the one side surface of the body.

[0017] According to some embodiments of the present invention, a plurality of third gate lines and a plurality of fourth gate lines are provided on the main body, and the plurality of third gate lines and the plurality of fourth gate lines are arranged alternately and spaced along the first direction, the third gate line is provided between two adjacent first gate line segments of the plurality of first gate lines, the third gate line is located in the first groove, the third gate line is electrically connected to the plurality of second gate lines respectively, and the first connecting member is located on a side of the third gate line close to the one side surface of the main body; the fourth gate line is provided on a side of the first gate line away from the main body, the fourth gate line is electrically connected to the plurality of first gate lines respectively, and the second connecting member is located on a side of the fourth gate line away from the first gate line.

[0018] A battery string according to an embodiment of the second aspect of the present invention comprises: a plurality of battery cells, wherein the battery cells are battery cells according to the embodiment of the first aspect of the present invention, the plurality of battery cells are arranged along a second direction, and two adjacent battery cells are electrically connected.

[0019] 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.

[0020] 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.

[0021] 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

[0022] 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:

[0023] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the present invention;

[0024] Figure 2 is a top view of a battery cell according to an embodiment of the present invention;

[0025] Figure 3 is a side view of a battery cell according to an embodiment of the present invention;

[0026] Figure 4 FIG. 4 is a side view of a battery cell according to an embodiment of the present invention from another angle.

[0027] Reference numerals:

[0028] 100. Battery cell;

[0029] 1. body; 11. first groove; 12. second groove;

[0030] 2. first grid line; 21. first grid line segment;

[0031] 3. second grid line; 31. second grid line segment;

[0032] 4. First connecting piece; 5. Second connecting piece. DETAILED DESCRIPTION

[0033] 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 4 A battery cell 100 according to an embodiment of the first aspect of the present invention is described.

[0034] like Figure 1 As shown, a battery cell 100 according to the first embodiment of the present invention comprises a body 1, a plurality of first grid lines 2, a plurality of second grid lines 3, a plurality of first connectors 4 and a plurality of second connectors 5. In the description of the present invention, "plurality" means two or more.

[0035] Specifically, a plurality of first grooves 11 and a plurality of second grooves 12 are formed on one side surface of the body 1. The plurality of first grooves 11 are arranged along a first direction (eg Figure 1 The first grooves 11 are arranged in a spaced relationship along the second direction (as shown in the left and right directions). Figure 1The second grooves 12 extend in the up-down direction as shown, and a plurality of second grooves 12 are arranged at intervals along the second direction, and the second grooves 12 extend along the first direction.

[0036] For example, in Figure 1 and Figure 2 In the example, along the thickness direction of the body 1, a plurality of first grooves 11 and a plurality of second grooves 12 are formed on the above-mentioned one side surface of the body 1, and the plurality of first grooves 11 respectively intersect with the plurality of second grooves 12. In this way, the first grooves 11 and the second grooves 12 have simple structures and are easy to form and process, thereby improving the production efficiency of the battery cell 100.

[0037] Combination Figure 1 and Figure 2 A plurality of first gate lines 2 are arranged on the above-mentioned one side surface of the body 1, a plurality of second gate lines 3 are respectively arranged in a plurality of second grooves 12, a plurality of first gate lines 2 and a plurality of second gate lines 3 are alternately arranged along the second direction, the polarities of the first gate lines 2 and the second gate lines 3 are opposite, the first gate line 2 includes a plurality of first gate line segments 21 arranged along the first direction, and the first groove 11 is located between two adjacent first gate line segments 21.

[0038] For example, in Figure 1 and Figure 2 , 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 first gate line 2 is located on the above-mentioned one side surface of the body 1 between two adjacent second grooves 12, that is, the first gate line 2 is located between two adjacent second grooves 12, and the first gate line 2 is located on the above-mentioned one side surface of the body 1 obliquely behind the second gate line 3. Along the thickness direction of the body 1, the height of the first gate line 2 away from the body 1 is greater than the height of the second gate line 3 away from the bottom wall of the second groove 12.

[0039] The opposite polarity of the first grid line 2 and the second grid line 3 can be understood as: when the first grid line 2 is a positive grid line, the second grid line 3 is a negative grid line; when the first grid line 2 is a negative grid line, the second grid line 3 is a positive grid line. In this way, the structure and arrangement of the first grid line 2 and the second grid line 3 are simple and easy to produce, thereby increasing the production cost of the battery cell 100. In addition, the first grid line 2 and the second grid line 3 can collect and transmit photogenerated carriers to form current, thereby enabling the battery cell 100 to convert solar energy into electrical energy.

[0040] Combination Figure 1 and Figure 2, multiple first connecting members 4 and multiple second connecting members 5 are alternately arranged along the first direction, multiple first connecting members 4 are respectively arranged in multiple first grooves 11, multiple first connecting members 4 are respectively electrically connected to multiple second gate lines 3 (for example, welded), and the second connecting members 5 are arranged on a side of the first gate line 2 away from the main body 1, and multiple second connecting members 5 are respectively electrically connected to multiple first gate lines 2.

[0041] For example, in Figure 1 and Figure 2 In the example, the first connection member 4 and the second gate line 3 are electrically connected at the intersection of the first groove 11 and the second groove 12, the second connection member 5 is connected to a plurality of first gate line segments 21, and there is a gap between the end of the first gate line segment 21 and the adjacent first connection member 4. It should be noted that the first gate line 2 and the second gate line 3 are respectively auxiliary gate lines, and the first connection member 4 and the second connection member 5 are respectively welding strips.

[0042] Thus, the second groove 12 is arranged so that the height of the side of the second gate line 3 away from the bottom wall of the second groove 12 along the thickness direction of the main body 1 (i.e., the front-to-back direction) is lower than the height of the above-mentioned side of the first gate line 2 away from the main body 1, that is, the adjacent first gate line 2 and the second gate line 3 are not in the same plane, so that after the second connecting member 5 is connected to the first gate line 2, there is a gap between the side of the second connecting member 5 facing the first gate line 2 and the second gate line 3, and the second connecting member 5 and the second gate line 3 are insulated by the gap, thereby avoiding electrical connection between the second connecting member 5 and the second gate line 3, avoiding short circuit of the battery cell 100, and extending the service life of the battery cell 100.

[0043] In addition, the first groove 11 is provided so that the first connector 4 is arranged in the first groove 11, and the second connector 5 is arranged on the above-mentioned side surface of the body 1, and the first connector 4 and the adjacent second connector 5 are not in the same plane. The side wall of the first groove 11 limits the first connector 4. When the first connector 4 is offset, the side wall of the first groove 11 blocks the first connector 4, and the first connector 4 can only contact the second grid line 3 on the front side of the first connector 4, avoiding the first connector 4 from contacting the adjacent first grid line segment 21 to cause a short circuit, thereby further avoiding a short circuit in the battery cell 100. Moreover, the provision of the first groove 11 and the second groove 12 also facilitates the search for the arrangement positions of the first grid line 2, the second grid line 3, the first connector 4, and the second connector 5, thereby improving the production efficiency of the battery cell 100.

[0044] In addition, the thickness of the body 1 at the bottom wall of the second groove 12 is less than the thickness of the above-mentioned one side surface of the body 1, thereby reducing the distance for the carriers on the body 1 to reach the second grid line 3, reducing the body resistance, enhancing the electron collection ability of the second grid line 3, improving the power of the battery cell 100, and improving the power of the photovoltaic module (not shown in the figure). Moreover, it also reduces the use of other components (such as insulating glue) to insulate the first connector 4 and the first grid line 2, and the second connector 5 and the second grid line 3, reducing the amount of materials used and reducing the production cost of the battery cell 100. It should be noted that the second grid line 3 extends in the left and right directions, increasing the contact area between the second grid line 3 and the body 1, and improving the ability of the second grid line 3 to collect electrons, thereby improving the photoelectric conversion ability of the battery cell 100, but it is not limited to this. It should be noted that the extension direction of the first groove 11 is perpendicular to the extension direction of the second groove 12.

[0045] According to the battery cell 100 of the present invention, the second groove 12 is provided so that the second connector 5 and the second grid line 3 are spaced along the thickness direction of the body 1 to achieve insulation and avoid short circuit. In addition, the first connector 4 is placed in the first groove 11, and the side wall of the first groove 11 limits the first connector 4, so that the first connector 4 can only be electrically connected to the second grid line 3 on the front side of the first connector 4, avoiding the first connector 4 from offsetting and contacting the first grid line segment 21 during welding, and further avoiding short circuit in the battery cell 100. In addition, the distance from the carrier on the body 1 to the second grid line 3 is reduced, the body resistance is reduced, the electron collection ability of the second grid line 3 is enhanced, the power of the battery cell 100 is increased, and the power of the photovoltaic module is increased. Moreover, the use of other components (such as insulating glue) is also reduced, and the production cost of the battery cell 100 is reduced.

[0046] According to some embodiments of the present invention, referring to Figure 2 The second gate line 3 includes a second direction (such as Figure 2 The second connecting member 5 is located between two adjacent second gate line segments 31 of the plurality of second gate lines 3, and the second connecting member 5 and ends of the two adjacent second gate line segments 31 are spaced apart from each other.

[0047] For example, in Figure 2 In the example of , the left and right ends of the second grid line segment 31 are spaced apart from the adjacent second connector 5. In this arrangement, the front side of the second connector 5 is not provided with the second grid line 3, and the end of the second grid line segment 31 is spaced apart from the adjacent second connector 5, further avoiding the second connector 5 and the second grid line segment 31 from contacting and short-circuiting when the second connector 5 is offset, thereby further extending the service life of the battery cell 100.

[0048] According to some embodiments of the present invention, referring to Figure 2and Figure 3 The width of the first groove 11 is w1, and the depth of the first groove 11 is h1, wherein w1 and h1 respectively satisfy: 150 μm≤w1≤500 μm, 10 μm≤h1≤30 μm.

[0049] For example, when the width of the first groove 11 is greater than 500 μm, the width of the first groove 11 is larger, and the length of the portion of the main body 1 between two adjacent first grooves 11 along the left-right direction is smaller, that is, the length of the first gate line segment 21 along the left-right direction is shorter, which reduces the contact area between the first gate line segment 21 and the main body 1, thereby reducing the ability of the first gate line segment 21 to collect electrons, and further reducing the photoelectric conversion ability of the battery cell 100.

[0050] When the width of the first groove 11 is less than 150 μm, the width of the first groove 11 is small, which increases the difficulty of placing the first connector 4 in the first groove 11 , increases the difficulty of producing the battery cell 100 , and reduces the production efficiency of the battery cell 100 .

[0051] When the depth of the first groove 11 is greater than 30 μm, the depth of the first groove 11 is large, and the thickness of the body 1 at the bottom wall of the first groove 11 is small, which reduces the amount of carriers on the body 1 at the bottom wall of the first groove 11, thereby reducing the photoelectric conversion capacity of the battery cell 100. In addition, the structural strength of the body 1 at the bottom wall of the first groove 11 is also reduced, and the body 1 is prone to breakage at the first groove 11, shortening the service life of the battery cell 100.

[0052] When the depth of the first groove 11 is less than 10 μm, the depth of the first groove 11 is small, which reduces the height difference between the first connector 4 and the first grid line segment 21 along the thickness direction of the body 1, so that when the first connector 4 is offset, it is easy to contact with the end of the adjacent first grid line segment 21, resulting in a short circuit. In addition, when a third grid line (such as a main grid line) is provided on the battery cell 100, the third grid line is first placed in the first groove 11, and then the first connector 4 is placed on the side of the third grid line away from the bottom wall of the first groove 11, thereby increasing the height of the first connector 4, so that the first connector 4 and the first grid line segment 21 are in the same plane, and when the first connector 4 is offset, it is easy to contact with the first grid line segment 21 to cause a short circuit.

[0053] In this way, when the width w1 of the first groove 11 and the depth h1 of the first groove 11 respectively satisfy: 150μm≤w1≤500μm, 10μm≤h1≤30μm, the width and depth of the first groove 11 are reasonably set, the length of the first grid line segment 21 along the left and right direction is extended, and the contact area between the first grid line segment 21 and the body 1 is increased, thereby increasing the ability of the first grid line segment 21 to collect electrons, thereby reducing the photoelectric conversion ability of the battery cell 100. Moreover, the difficulty of placing the first connecting member 4 in the first groove 11 is reduced, the production difficulty of the battery cell 100 is reduced, and the production efficiency of the battery cell 100 is improved. In addition, while ensuring that a short circuit is avoided, the thickness of the body 1 at the bottom wall of the first groove 11 is increased, and the amount of carriers on the body 1 at the bottom wall of the first groove 11 is increased, thereby improving the photoelectric conversion ability of the battery cell 100. The structural strength of the body 1 is also improved, the body 1 is prevented from breaking, and the service life of the battery cell 100 is extended. In addition, in the case of having or without the third grid line, the first connector 4 and the first grid line segment 21 are not in different horizontal planes, thereby avoiding contact between the first connector 4 and the first grid line segment 21 when the first connector 4 is offset, thereby avoiding short circuit of the battery cell 100.

[0054] According to some embodiments of the present invention, referring to Figure 2 and Figure 4 The width of the second groove 12 is w2, and the depth of the second groove 12 is h2, wherein w2 and h2 respectively satisfy: 50μm≤w2≤100μm, 5μm≤h2≤30μm.

[0055] For example, when the width of the second groove 12 is greater than 100 μm, the width of the second groove 12 is larger, and the width of the portion of the main body 1 between two adjacent second grooves 12 along the up and down directions is smaller, which reduces the material of the main body 1 and also reduces the amount of carriers on the main body 1, thereby reducing the photoelectric conversion capacity of the battery cell 100.

[0056] When the width of the second groove 12 is less than 50 μm, the width of the second groove 12 is small, which increases the difficulty of placing the second gate line 3 in the second groove 12 , increases the difficulty of producing the battery cell 100 , and reduces the production efficiency of the battery cell 100 .

[0057] When the depth of the second groove 12 is greater than 30 μm, the depth of the second groove 12 is greater, and the thickness of the body 1 at the bottom wall of the second groove 12 is smaller, which reduces the amount of carriers on the body 1 at the bottom wall of the first groove 11, thereby reducing the photoelectric conversion capacity of the battery cell 100. In addition, the structural strength of the body 1 at the bottom wall of the second groove 12 is also reduced, and the body 1 is prone to breakage at the second groove 12, shortening the service life of the battery cell 100.

[0058] When the depth of the first groove 11 is less than 5 μm, the depth of the first groove 11 is small, which increases the thickness of the body 1 at the second groove 12, increases the distance for the carriers to reach the second grid line 3, increases the body resistance, reduces the ability of the second grid line 3 to collect electrons, reduces the power of the battery cell 100, and thus reduces the power of the photovoltaic module.

[0059] Therefore, by setting the width w2 of the second groove 12 and the depth h2 of the second groove 12 to respectively satisfy: 50μm≤w2≤100μm, 5μm≤h2≤30μm, the width and depth of the second groove 12 are reasonably set, the width of the part of the body 1 between two adjacent second grooves 12 is increased, the material of the body 1 is increased, and the amount of carriers on the body 1 is also increased, thereby improving the photoelectric conversion capacity of the battery cell 100. In addition, the difficulty of placing the second grid line 3 in the second groove 12 is reduced, the difficulty of producing the battery cell 100 is reduced, and the production efficiency of the battery cell 100 is improved. In addition, while ensuring that a short circuit is avoided, the thickness of the body 1 at the bottom wall of the second groove 12 is increased, the amount of carriers on the body 1 at the bottom wall of the second groove 12 is increased, and the photoelectric conversion capacity of the battery cell 100 is improved. The structural strength of the body 1 is also improved, the body 1 is prevented from breaking, and the service life of the battery cell 100 is extended. In addition, the thickness of the body 1 at the second groove 12 is reduced, the distance for the carrier to reach the second grid line 3 is reduced, the body resistance is reduced, the ability of the second grid line 3 to collect electrons is improved, the power of the battery cell 100 is improved, and thus the power of the photovoltaic module is improved. It should be noted that the adjacent first grid line segments 21 and the first connector 4 can be made not in the same plane, and the adjacent second grid lines 3 and the second connector 5 can be made not in the same plane, which effectively avoids the short circuit when the first connector 4 and the second connector 5 are offset. But it is not limited to this.

[0060] According to some embodiments of the present invention, an end face of the first grid line segment 21 adjacent to the first groove 11 is spaced apart from the side wall of the corresponding first groove 11. For example, there is a gap between the right end face of the first grid line segment 21 adjacent to the left side of the first groove 11 and the left side wall of the first groove 11, and there is a gap between the left end face of the first grid line segment 21 adjacent to the right side of the first groove 11 and the right side wall of the first groove 11. Such a setting further increases the distance between the end faces of the first connecting member 4 and the first grid line segments 21 on both sides in the first groove 11, further avoids the first connecting member 4 from contacting the first grid line segment 21 when it is offset, thereby further effectively avoiding the first connecting member 4 from contacting the first grid line segment 21 and causing a short circuit. In addition, the length of the first grid line segment 21 along the left-right direction is also reduced, the material consumption of the first grid line segment 21 is reduced, and the production cost of the first grid line 2 is reduced, thereby reducing the production cost of the battery cell 100.

[0061] According to some embodiments of the present invention, the distance between the end surface of one end of the first grid segment 21 adjacent to the first groove 11 and the corresponding side wall of the first groove 11 is d, wherein d satisfies: 0<d≤500μm. For example, when the distance between the end surface of one end of the first grid segment 21 adjacent to the first groove 11 and the corresponding side wall of the first groove 11 is greater than 500μm, the length of the first grid segment 21 along the left-right direction is shortened, the contact area between the first grid segment 21 and the above-mentioned one side surface of the body 1 is reduced, the ability of the first grid segment 21 to collect electrons is reduced, and the power of the battery cell 100 is reduced.

[0062] Thus, by setting the distance d between the end surface of one end of the first grid line segment 21 adjacent to the first groove 11 and the corresponding side wall of the first groove 11 to satisfy: 0<d≤500μm, the distance between the first grid line segment 21 and the first groove 11 is reasonably set, ensuring that there is a gap between the first connector 4 and the end adjacent to the first grid line segment 21 to achieve insulation, effectively avoiding short circuits, and extending the service life of the battery cell 100. In addition, the length of the first grid line segment 21 is also reasonably set, increasing the contact area between the first grid line segment 21 and the body 1, increasing the ability of the first grid line segment 21 to collect electrons, and increasing the power of the battery cell 100, thereby increasing the power of the photovoltaic module.

[0063] According to some embodiments of the present invention, referring to Figure 3 , the first connecting member 4 is connected to one side of the second gate line 3 close to the surface of the body 1. For example, Figure 3 In the example of , the front side of the first connector 4 is connected to the rear side of the second grid line 3, and the front side of the second grid line 3 is in contact with the bottom wall of the second groove 12. In this way, the second grid line 3 collects electrons on the body 1, and the first connector 4 collects electrons on multiple second grid lines 3, so that the battery cell 100 achieves photoelectric conversion. In addition, the connection difficulty of the first connector 4 and the second grid line 3 is reduced, which facilitates the production of the battery cell 100 and improves the production efficiency of the battery cell 100.

[0064] Optionally, a portion of the second grid line 3 is located in the second groove 12, and another portion of the second grid line 3 protrudes from the above-mentioned one side surface of the body 1. For example, the front portion of the second grid line 3 is located in the second groove 12, and the rear half of the second grid line 3 protrudes from the above-mentioned one side surface of the body 1. Such a configuration facilitates the contact between the first connector 4 and the second grid line 3, reduces the difficulty of welding the first connector 4 and the second grid line 3, and is conducive to improving the welding yield of the first connector 4 and the second grid line 3, thereby improving the production efficiency and yield of the battery cell 100.

[0065] According to some embodiments of the present invention, a plurality of third grid lines (not shown) and a plurality of fourth grid lines (not shown) are provided on the main body 1, and the plurality of third grid lines and the plurality of fourth grid lines are arranged along a first direction (such as Figure 2 The third gate line is arranged alternately and spaced apart in the left and right directions shown in the figure, the third gate line is arranged between two adjacent first gate line segments 21 of the plurality of first gate lines 2, the third gate line is located in the first groove 11, the third gate line is electrically connected to the plurality of second gate lines 3 respectively, and the first connecting member 4 is located on one side of the surface of the third gate line close to the body 1. The fourth gate line is arranged on the side of the first gate line 2 away from the body 1, the fourth gate line is electrically connected to the plurality of first gate lines 2 respectively, and the second connecting member 5 is located on the side of the fourth gate line away from the first gate line 2.

[0066] For example, the first connecting member 4 is located at the rear side of the third grid line, and the first connecting member 4 blocks the third grid line. Figure 1 and Figure 2 The third grid line is not shown in the figure. The third grid line is limited by the side wall of the first groove 11, and the third grid line is spaced from the ends of two adjacent first grid line segments 21 in the left-right direction to achieve insulation. The plurality of third grid lines and the plurality of second grid lines 3 can be electrically connected by welding. The second connecting member 5 is located on the rear side of the fourth grid line, and the second connecting member 5 shields the fourth grid line. Figure 1 and Figure 2 The fourth grid line is not shown in the figure. The second groove 12 is provided so that the fourth grid line is spaced apart from the adjacent second grid line 3 along the front-back direction to achieve insulation. A plurality of fourth grid lines and a plurality of first grid lines 2 can be electrically connected by welding. It should be noted that the third grid line and the fourth grid line are respectively main grid lines, wherein the polarity of the third grid line 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.

[0067] With such arrangement, electrons on a plurality of first grid lines 2 can be collected through the third grid line, and then the first connector 4 collects the electrons on the third grid line. The fourth grid line can collect electrons on a plurality of second grid lines 3, and then the second connector 5 collects the electrons on the fourth grid line, so as to realize the extraction of the current on the battery cell 100, so that the battery cell 100 can be used normally. Moreover, a short circuit of the battery cell 100 is also avoided. It should be noted that the cross-sectional shape of the first grid line 2, the cross-sectional shape of the second grid line 3, the cross-sectional shape of the first connector 4, and the cross-sectional shape of the second connector 5 can be respectively a geometric shape such as a rectangle, a trapezoid, a circle, etc., but are not limited to these.

[0068] A battery string (not shown) according to an embodiment of the second aspect of the present invention comprises a plurality of battery cells 100, wherein the battery cells 100 are battery cells 100 according to an embodiment of the first aspect of the present invention, and the plurality of battery cells 100 are arranged along a second direction, and two adjacent battery cells 100 are electrically connected.

[0069] According to the battery string of the present invention, two adjacent battery cells 100 are electrically connected via the first connector 4 and the second connector 5. By using the battery cells 100, short circuit of the battery string is avoided, the service life of the battery string is extended, and the power of the battery string is also improved.

[0070] 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 according to the second embodiment of the present invention.

[0071] According to the photovoltaic module of the present invention, by using the above-mentioned cell sheet 100 or cell string, short circuit of the photovoltaic module is avoided, the service life of the photovoltaic module is extended, and the power of the photovoltaic module is also improved. The photovoltaic module also includes glass, film, back plate, junction box and frame to complete the photovoltaic module assembly.

[0072] The photovoltaic power generation system according to the fourth embodiment of the present invention comprises the battery cell 100 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.

[0073] According to the photovoltaic power generation system of the present invention, by using the above-mentioned cell sheet 100, cell string or photovoltaic module, short circuit of the photovoltaic power generation system is avoided, the service life of the photovoltaic power generation system is extended, and the power of the photovoltaic power generation system is improved.

[0074] Other structures and operations of the cell sheet 100, cell string, photovoltaic module and 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.

[0075] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships 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, rather than indicating or implying 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 limiting the present invention.

[0076] 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.

[0077] 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 body, wherein a plurality of first grooves and a plurality of second grooves are formed on one side surface of the body, wherein the plurality of first grooves are arranged at intervals along a first direction, and the first grooves extend along a second direction, and the plurality of second grooves are arranged at intervals along the second direction, and the second grooves extend along the first direction; a plurality of first gate lines and a plurality of second gate lines, wherein the plurality of first gate lines are arranged on the one side surface of the body, the plurality of second gate lines are respectively arranged in the plurality of second grooves, the plurality of first gate lines and the plurality of second gate lines are alternately arranged along the second direction, the first gate lines and the second gate lines have opposite polarities, the first gate line comprises a plurality of first gate line segments arranged along the first direction, and the first groove is located between two adjacent first gate line segments; A plurality of first connecting members and a plurality of second connecting members, the plurality of first connecting members and the plurality of second connecting members are alternately arranged along the first direction, the plurality of first connecting members are respectively arranged in the plurality of first grooves, the plurality of first connecting members are respectively electrically connected to the plurality of second gate lines, the second connecting members are arranged on a side of the first gate line away from the main body, and the plurality of second connecting members are respectively electrically connected to the plurality of first gate lines.

2. The battery cell according to claim 1, characterized in that: The second gate line includes a plurality of second gate line segments arranged at intervals along the second direction, the second connecting member is located between two adjacent second gate line segments of the plurality of second gate lines, and the second connecting member is spaced apart from ends of two adjacent second gate line segments.

3. The battery cell according to claim 1, characterized in that: The width of the first groove is w1, and the depth of the first groove is h1, wherein w1 and h1 respectively satisfy: 150 μm≤w1≤500 μm, 10 μm≤h1≤30 μm.

4. The battery cell according to claim 1, characterized in that: The width of the second groove is w2, and the depth of the second groove is h2, wherein w2 and h2 respectively satisfy: 50 μm≤w2≤100 μm, 5 μm≤h2≤30 μm.

5. The battery cell according to claim 1, characterized in that: An end surface of the first gate line segment adjacent to the first groove is spaced apart from a corresponding sidewall of the first groove.

6. The battery cell according to claim 5, characterized in that: The distance between the end surface of the first gate line segment adjacent to the first groove and the corresponding sidewall of the first groove is d, wherein d satisfies: 0<d≤500 μm.

7. The battery cell according to claim 1, characterized in that: The first connecting member is connected to a side of the second gate line close to the one side surface of the body.

8. The battery cell according to claim 1, characterized in that: A portion of the second gate line is located in the second groove, and another portion of the second gate line protrudes from the one side surface of the body.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The body is 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 first direction, the third gate line is provided between two adjacent first gate line segments of the plurality of first gate lines, the third gate line is located in the first groove, the third gate line is electrically connected to the plurality of second gate lines respectively, and the first connecting member is located on a side of the third gate line close to the one side surface of the body; The fourth gate line is arranged on a side of the first gate line away from the body, the fourth gate line is electrically connected to a plurality of the first gate lines respectively, and the second connecting member is located on a side of the fourth gate line away from the first gate lines.

10. A battery string, characterized in that: include: A plurality of battery cells, wherein the battery cells are the battery cells according to any one of claims 1 to 9, the plurality of battery cells are arranged along a second direction, and two adjacent battery cells are electrically connected.

11. A photovoltaic module, characterized in that: The method comprises the battery cell according to any one of claims 1 to 9, or the battery string according to claim 10.

12. A photovoltaic power generation system, characterized in that: It comprises the cell sheet according to any one of claims 1 to 9, or the cell string according to claim 10, or the photovoltaic module according to claim 11.

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