Battery piece assembly, battery string and photovoltaic assembly

Abstract

The utility model discloses a battery piece assembly, a battery string and a photovoltaic assembly, the battery piece assembly comprises a battery piece and an insulating piece, the battery piece is provided with a plurality of main grid lines and a plurality of auxiliary grid lines; and the insulating parts are arranged between the adjacent positive main grid lines and negative main grid lines, and cover the parts, between the adjacent positive main grid lines and negative main grid lines, of the plurality of positive auxiliary grid line segments and / or the plurality of negative auxiliary grid line segments. Therefore, the main function of the insulating part is to prevent the short circuit phenomenon between the opposite grid lines, and when metal foreign matters fall off from the surface of the battery piece, the arrangement of the insulating part can prevent the metal foreign matters from overlapping the positive auxiliary grid line segment and the negative auxiliary grid line segment at the same time to cause short circuit. The layout of the insulating part can also avoid the short circuit phenomenon caused by the deviation of the welding strip when the main grid line is connected with the welding strip in the subsequent lamination process, and the short circuit resistance of the battery piece assembly is improved on the premise that the production cost of the battery piece assembly is not increased.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module technology, and in particular to a cell module, a cell string and a photovoltaic module. Background Technology

[0002] In the existing technology, photovoltaic cells are a type of structure with no grid lines on the front and fine interdigitated grids on the back. Once a metal foreign object is connected, it will cause the cell to short-circuit abnormally. Since photovoltaic cells use tin-plated copper strips connected in series, if the solder strip is misaligned or copper strip debris is brought into the cell, it is very easy to cause the positive and negative electrodes of the photovoltaic cell to connect and cause a short circuit. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, the first objective of the present invention is to provide a battery cell assembly that can improve the short-circuit withstand performance of the battery cell assembly.

[0004] The second objective of this invention is to provide a battery string, including the battery cell assembly described in the above embodiments.

[0005] The third objective of this invention is to provide a photovoltaic module, including the cell module or cell string described in the above embodiments.

[0006] A battery cell assembly according to a first aspect of the present invention includes: a battery cell and an insulating member. The battery cell has a plurality of main grid lines and a plurality of sub-grid lines. The plurality of main grid lines include a plurality of positive main grid lines and a plurality of negative main grid lines, which are staggered along a first direction. The plurality of sub-grid lines include a plurality of positive sub-grid lines and a plurality of negative sub-grid lines, which are staggered along a second direction. Each positive sub-grid line includes a plurality of positive sub-grid line segments, which are spaced apart along the first direction. Adjacent positive sub-grid line segments are spaced apart. A first opening is defined between the negative electrode sub-gate lines, which include multiple negative electrode sub-gate line segments. These multiple negative electrode sub-gate line segments are spaced apart along the first direction. A second opening is defined between two adjacent negative electrode sub-gate line segments. The positive electrode main gate line is located at the second opening and is electrically connected to the positive electrode sub-gate line segments. The negative electrode main gate line is located at the first opening and is electrically connected to the negative electrode sub-gate line segments. An insulating member is located between adjacent positive electrode main gate lines and negative electrode main gate lines, and the insulating member covers the portions of the multiple positive electrode sub-gate line segments and / or the portions of the multiple negative electrode sub-gate line segments located between adjacent positive electrode main gate lines and negative electrode main gate lines.

[0007] According to the embodiments of the present invention, the main function of the insulating component in the battery cell assembly is to prevent short circuits between dissimilar grid lines. When a metal foreign object falls onto the surface of the battery cell, the insulating component can prevent the metal foreign object from simultaneously contacting the positive and negative sub-grid lines, thus preventing a short circuit. The layout of the insulating component can also prevent short circuits caused by the offset of the solder ribbon when the main grid line is connected to the solder ribbon during subsequent lamination. This improves the short-circuit resistance of the battery cell assembly without increasing the production cost of the battery cell assembly.

[0008] In some embodiments, the insulating element includes: a first insulating element disposed between adjacent positive main gate lines and negative main gate lines, the first insulating element covering the positive sub-gate line segment; or, the first insulating element covering the negative sub-gate line segment.

[0009] In some embodiments, the device further includes: a second insulating member, wherein when the first insulating member covers the positive electrode sub-gate segment, the second insulating member is disposed at at least one end of the negative electrode sub-gate segment along the first direction; or, when the first insulating member covers the negative electrode sub-gate segment, the second insulating member is disposed at at least one end of the positive electrode sub-gate segment along the first direction.

[0010] In some embodiments, the first insulating member and the second insulating member, which are adjacent to each other, are connected to each other along the second direction; or, the first insulating member and the second insulating member are spaced apart.

[0011] In some embodiments, the length of the second insulating member along the first direction is L1, and L1 satisfies: 1mm≤L1≤5mm.

[0012] In some embodiments, the first insulating member is disposed on both sides of the main grid line along the first direction, and the first insulating members on both sides of the main grid line are symmetrically disposed along the second direction.

[0013] In some embodiments, the first insulating member covers a plurality of positive sub-gate line segments between adjacent positive main gate lines and negative main gate lines along the first direction, and the second insulating member covers the free ends of the negative sub-gate line segments; or, the first insulating member covers a plurality of negative sub-gate line segments between adjacent positive main gate lines and negative main gate lines along the first direction, and the second insulating member covers the free ends of the positive sub-gate line segments.

[0014] In some embodiments, the first insulating member is disposed on both sides of the main grid line along the first direction, and the first insulating members on both sides of the main grid line are staggered along the second direction.

[0015] In some embodiments, the plurality of first insulating elements include a plurality of first sub-insulating elements and a plurality of second sub-insulating elements, the first sub-insulating elements and the second sub-insulating elements being respectively disposed on both sides of the main gate line along the first direction, and the first sub-insulating elements and the second sub-insulating elements being staggered along the second direction; the first sub-insulating elements cover the portion of the positive electrode sub-gate line segment opposite to the first sub-insulating element, and the second sub-insulating elements cover the portion of the negative electrode sub-gate line segment opposite to the second sub-insulating element.

[0016] In some embodiments, the first sub-insulator covers the portion of the positive sub-gate segment opposite to the first sub-insulator, and the second insulator covers the free end of the adjacent negative sub-gate segment; the second sub-insulator covers the portion of the negative sub-gate segment opposite to the second sub-insulator, and the second insulator covers the free end of the adjacent positive sub-gate segment.

[0017] In some embodiments, the second insulating member is disposed at the same end of the first sub-insulating member and the second sub-insulating member along the first direction.

[0018] In some embodiments, the length of the second insulating member along the second direction is L2, wherein L2 satisfies: 0.1m ≤ L2 ≤ 0.3m.

[0019] The battery string according to a second aspect of the present invention includes the battery cell assembly according to the first aspect of the present invention described above.

[0020] A photovoltaic module according to a third aspect of the present invention includes a cell assembly according to the first aspect of the present invention, or a cell string according to the second aspect of the present invention.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of one embodiment of a battery cell assembly according to the present utility model;

[0024] Figure 2 yes Figure 1 Enlarged schematic diagram of region P in the middle;

[0025] Figure 3 This is a schematic diagram of a battery cell according to an embodiment of the present utility model;

[0026] Figure 4 yes Figure 3 Enlarged schematic diagram of the mid-Q region;

[0027] Figure 5 This is a schematic diagram of one embodiment of the insulating component according to the present utility model;

[0028] Figure 6 yes Figure 5 Enlarged schematic diagram of the R region;

[0029] Figure 7 This is a schematic diagram of another embodiment of the battery cell assembly according to the present utility model;

[0030] Figure 8 yes Figure 7 Enlarged schematic diagram of the S-region in the middle;

[0031] Figure 9 This is a schematic diagram of another embodiment of the insulating component according to an embodiment of the present utility model.

[0032] Figure label:

[0033] 100. Solar cell assembly;

[0034] 10. Solar cell; 11. Positive electrode main grid line; 12. Positive electrode secondary grid line segment; 121. First sub-grid line segment; 122. Second sub-grid line segment; 13. Negative electrode main grid line; 14. Negative electrode secondary grid line segment; 141. Third sub-grid line segment; 142. Fourth sub-grid line segment;

[0035] 20. Insulating component; 21. First insulating component; 211. First sub-insulating component; 212. Second sub-insulating component; 22. Second insulating component;

[0036] A. First direction; B. Second direction. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-9 A battery cell assembly 100 according to an embodiment of the present invention includes: a battery cell 10 and an insulating member 20, wherein the battery cell 10 has a first direction A and a second direction B.

[0038] Specifically, such as Figures 1-9As shown, the battery cell 10 has multiple main grid lines and multiple sub-grid lines. The multiple main grid lines include multiple positive main grid lines 11 and multiple negative main grid lines 13, which are staggered along a first direction A. The multiple sub-grid lines include multiple positive sub-grid lines and multiple negative sub-grid lines, which are staggered along a second direction B. The positive sub-grid lines include multiple positive sub-grid line segments 12. Line segments 12 are spaced apart along the first direction A, and a first opening is defined between two adjacent positive sub-gate lines 12. The negative sub-gate line includes multiple negative sub-gate lines 14, which are spaced apart along the first direction A. A second opening is defined between two adjacent negative sub-gate lines 14. The positive main gate line 11 is located at the second opening and is electrically connected to the positive sub-gate lines 12. The negative main gate line 13 is located at the first opening and is electrically connected to the negative sub-gate lines 14.

[0039] Combination Figure 3 and Figure 4 The positive electrode main gate line 11 and the negative electrode main gate line 13 extend along the second direction B, and multiple positive electrode main gate lines 11 and multiple negative electrode main gate lines 13 are arranged alternately along the first direction A. Positive electrode sub-gate line segments 12 and negative electrode sub-gate line segments 14 extend along the first direction A, and multiple positive electrode sub-gate line segments 12 are arranged alternately along the second direction B, as are multiple negative electrode gate line segments. The multiple positive electrode sub-gate line segments 12 and multiple negative electrode sub-gate line segments 14 are arranged alternately along the second direction B. The positive electrode sub-gate line segments 12 are connected to the positive electrode main gate line 11 and are perpendicular to each other. Along the first direction A, a first opening is defined between adjacent positive electrode sub-gate line segments 12, and multiple first openings are arranged alternately with multiple positive electrode sub-gate line segments 12. The negative electrode sub-gate segment 14 is connected to the negative electrode main gate line 13, and the negative electrode sub-gate segment 14 and the negative electrode main gate line 13 are perpendicular to each other. The positive electrode main gate line 11 is located at the first opening. Along the first direction A, a second opening is defined between adjacent negative electrode sub-gate segments 14. Multiple second openings are staggered with multiple negative electrode sub-gate segments 14, and the negative electrode main gate line 13 is located at the second opening.

[0040] Combination Figures 3-6 The insulating element 20 is disposed between adjacent positive main grid line 11 and negative main grid line 13, and the insulating element 20 covers the portions of multiple positive sub-grid line segments 12 and / or multiple negative sub-grid line segments 14 located between adjacent positive main grid line 11 and negative main grid line 13.

[0041] There are multiple insulating elements 20, which cover the portions of multiple positive sub-gate segments 12 located between adjacent positive main gate lines 11 and negative main gate lines 13; or, the multiple insulating elements 20 cover the portions of multiple negative gate segments located between adjacent positive main gate lines 11 and negative main gate lines 13; or, a portion of the multiple insulating elements 20 covers the portions of multiple positive sub-gate segments 12 located between adjacent positive main gate lines 11 and negative main gate lines 13, and a portion of the multiple insulating elements 20 covers the portions of multiple negative sub-gate segments 14 located between adjacent positive main gate lines 11 and negative main gate lines 13.

[0042] According to the embodiment of the present invention, the main function of the insulating member 20 in the battery cell assembly 100 is to prevent short circuits between heterogeneous grid lines. When a metal foreign object falls onto the surface of the battery cell 10, the insulating member 20 can prevent the metal foreign object from simultaneously contacting the positive electrode sub-grid line segment 12 and the negative electrode sub-grid line segment 14, thus preventing a short circuit. The layout of the insulating member 20 can also prevent short circuits caused by the offset of the solder ribbon when the main grid line is connected to the solder ribbon during the subsequent lamination process. This improves the short circuit resistance of the battery cell assembly 100 without increasing the production cost of the battery cell assembly 100.

[0043] According to some embodiments of this utility model, such as Figures 1-6 As shown, the insulating member 20 includes: a first insulating member 21, which is disposed between adjacent positive main grid line 11 and negative main grid line 13, and covers the positive sub-grid line segment 12; or, the first insulating member 21 covers the negative sub-grid line segment 14.

[0044] The positive electrode sub-gate segment 12 includes a first sub-gate segment 121 and a second sub-gate segment 122, which are respectively connected to both sides of the positive electrode main gate line 11 along the first direction A. The negative electrode sub-gate segment 14 includes a third sub-gate segment 141 and a fourth sub-gate segment 142, which are respectively connected to both sides of the negative electrode main gate line 13 along the first direction A. Between adjacent positive electrode main gate lines 11 and negative electrode main gate lines 13, the first sub-gate segments 121 of the plurality of positive electrode sub-gate segments 12 and the fourth sub-gate segments 142 of the plurality of negative electrode sub-gate segments 14 are staggered along the second direction B; or, the second sub-gate segments 122 of the plurality of positive electrode sub-gate segments 12 and the third sub-gate segments 141 of the plurality of negative electrode sub-gate segments 14 are staggered along the second direction B. The first insulating element 21 is disposed between the positive main grid line 11 and the negative main grid line 13. The first insulating element 21 extends along the first direction A. There are multiple first insulating elements 21. The multiple first insulating elements 21 cover the first sub-grid line segment 121 or the second sub-grid line segment 122 of the multiple positive and negative grid line segments; or, the multiple first insulating elements 21 cover the third sub-grid line segment 141 or the fourth sub-grid line segment 142 of the multiple negative grid line segments.

[0045] Therefore, the first insulating element 21 is suitable for covering multiple first sub-gate segments 121 or second sub-gate segments 122 between the positive main gate line 11 and the negative main gate line 13. When a foreign metal object falls or the solder ribbon shifts, the foreign metal object or solder ribbon only overlaps with the third sub-gate segment 141 or fourth sub-gate segment 142 of the same polarity, preventing a short circuit. Similarly, the first insulating element 21 covers multiple third sub-gate segments 141 or fourth sub-gate segments 142 between the positive main gate line 11 and the negative main gate line 13. When a foreign metal object falls or the solder ribbon shifts, the foreign metal object or solder ribbon only overlaps with the first sub-gate segment 121 or second sub-gate segment 122 of the same polarity, preventing a short circuit. During the lamination process, even if the solder ribbon shifts slightly, it will not cause a short circuit, improving the stability of the production process and the product qualification rate.

[0046] According to some embodiments of this utility model, such as Figures 1-6 As shown, it also includes: a second insulating member 22, wherein when the first insulating member 21 covers the positive electrode sub-gate segment 12, the second insulating member 22 is disposed at at least one end of the negative electrode sub-gate segment 14 along the first direction A; or, when the first insulating member 21 covers the negative electrode sub-gate segment 14, the second insulating member 22 is disposed at at least one end of the positive electrode sub-gate segment 12 along the first direction A.

[0047] When the first insulating member 21 covers the first sub-gate segment 121 or the second sub-gate segment 122 of the positive electrode sub-gate line, the second insulating member 22 is adapted to cover at least one end of the fourth sub-gate segment 142 or the third sub-gate segment 141 of the negative electrode sub-gate line adjacent to the main gate line along the first direction A. Alternatively, when the first insulating member 21 covers the third sub-gate segment 141 or the fourth sub-gate segment 142 of the negative electrode sub-gate line, the second insulating member 22 is adapted to cover at least one end of the second sub-gate segment 122 or the first sub-gate segment 121 of the positive electrode sub-gate line 12 adjacent to the main gate line along the first direction A.

[0048] Thus, the first insulator 21 directly isolates the electrical connection path between the positive electrode sub-grid segment 12 and the negative electrode sub-grid segment 14, preventing short circuits between dissimilar grid lines. The second insulator 22 provides additional protection at the end of the sub-grid segment, ensuring that even in extreme cases (such as the falling of a metal foreign object or solder strip misalignment), the solder strip electrically connected to the main grid line is prevented from failing to connect with the dissimilar sub-grid segment, further preventing short circuits and improving the reliability and safety of the cell assembly 100.

[0049] According to some embodiments of this utility model, such as Figure 6 As shown, along the second direction B, the first insulating member 21 and the second insulating member 22 that are adjacent to each other are connected to each other; or, the first insulating member 21 and the second insulating member 22 are spaced apart.

[0050] In some embodiments, the first insulating member 21 and the second insulating member 22 adjacent to each other are an integral structure, which can simplify the processing of the insulating member 20 on the surface of the battery cell 10, simplify the production process, improve the printing quality of the insulating member 20, reduce the phenomenon of missing printing, and improve the yield of the battery cell assembly 100. Alternatively, in some embodiments, the first insulating member 21 and the second insulating member 22 are two independent structures, and the position and size of each insulating member 20 can be adjusted according to specific needs to adapt to different battery cell 10 designs. Moreover, the first insulating member 21 and the second insulating member 22 can be precisely cut according to actual needs, reducing material usage and lowering production costs.

[0051] According to some embodiments of this utility model, such as Figure 6 As shown, the length of the second insulating member 22 along the first direction A is L1, and L1 satisfies: 1mm≤L1≤5mm.

[0052] The minimum length of the second insulating member 22 in the first direction A is 1 mm, ensuring that the second insulating member 22 can provide electrical isolation and prevent short circuits caused by metal foreign objects or solder strip misalignment. The maximum length of the second insulating member 22 in the first direction A is 5 mm, avoiding the second insulating member 22 being too long and occupying too much space, and preventing the second insulating member 22 from affecting the current collection effect and the effective light-illuminated area of ​​the solar cell 10.

[0053] Therefore, by limiting the length range of the second insulating member 22 in the first direction A, the impact on the effective light-illuminated area of ​​the surface of the battery cell 10 can be reduced while ensuring electrical isolation, thereby improving the photoelectric conversion efficiency.

[0054] According to some embodiments of this utility model, such as Figures 1-6 As shown, the first insulating element 21 is disposed on both sides of the main grid line along the first direction A, and the first insulating elements 21 on both sides of the main grid line are symmetrically disposed along the second direction B.

[0055] The first sub-gate segment 121 and the second sub-gate segment 122 of the positive electrode sub-gate segment 12 are respectively disposed on both sides of the positive electrode main gate line 11 along the first direction A, and the first sub-gate segment 121 and the second sub-gate segment 122 are symmetrically arranged along the positive electrode main gate line 11. Correspondingly, when the first insulating member 21 covers the first sub-gate segment 121 and the second sub-gate segment 122, the first insulating member 21 on both sides of the positive electrode main gate line 11 is symmetrically arranged along the positive electrode main gate line 11. The third sub-gate segment 141 and the fourth sub-gate segment 142 of the negative electrode sub-gate segment 14 are respectively disposed on both sides of the negative electrode main gate line 13 along the first direction A, and the third sub-gate segment 141 and the fourth sub-gate segment 142 are symmetrically arranged along the negative electrode main gate line 13. Correspondingly, when the first insulating element 21 covers the third sub-grid segment 141 and the fourth sub-grid segment 142, the first insulating elements 21 on both sides of the negative main grid line 13 are symmetrically arranged along the negative main grid line 13.

[0056] Therefore, by setting the first insulating element 21 on both sides of the main grid line, the positive and negative grid lines can be more comprehensively isolated, preventing short circuits between opposite grid lines. The symmetrical design ensures uniform electrical isolation, further improving system safety. The symmetrical design also makes the manufacturing process more standardized, reducing complexity and the possibility of errors in the production process.

[0057] According to some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the first insulating member 21 covers multiple positive sub-gate segments 12 between adjacent positive main gate lines 11 and negative main gate lines 13 along the first direction A, and the second insulating member 22 covers the free ends of the negative sub-gate segments 14; or, the first insulating member 21 covers multiple negative sub-gate segments 14 between adjacent positive main gate lines 11 and negative main gate lines 13 along the first direction A, and the second insulating member 22 covers the free ends of the positive sub-gate segments 12.

[0058] When the first insulating member 21 covers the first sub-gate segment 121 or the second sub-gate segment 122 of the positive electrode sub-gate line, the second insulating member 22 is adapted to cover the fourth sub-gate segment 142 or the third sub-gate segment 141 of the negative electrode sub-gate line adjacent to one end of the positive electrode main gate line 11 along the first direction A. Alternatively, when the first insulating member 21 covers the third sub-gate segment 141 or the fourth sub-gate segment 142 of the negative electrode sub-gate line, the second insulating member 22 is adapted to cover the second sub-gate segment 122 or the fourth sub-gate segment 142 of the positive electrode sub-gate line 12 adjacent to one end of the negative electrode main gate line 13 along the first direction A.

[0059] Thus, the first insulating element 21 covers the sub-grid line segments between the main grid lines, and the second insulating element 22 covers the free ends of the sub-grid line segments. Through the synergistic effect of the first insulating element 21 and the second insulating element 22, double-layer protection is provided, ensuring all-round electrical isolation and significantly reducing the short-circuit risk of the cell module 100.

[0060] According to some embodiments of this utility model, such as Figures 7-9 As shown, the first insulating element 21 is disposed on both sides of the main grid line along the first direction A, and the first insulating elements 21 on both sides of the main grid line are staggered along the second direction B.

[0061] The first sub-gate segment 121 and the second sub-gate segment 122 of the positive electrode sub-gate segment 12 are respectively disposed on both sides of the positive electrode main gate line 11 along the first direction A, and the first sub-gate segment 121 and the second sub-gate segment 122 are symmetrically arranged along the positive electrode main gate line 11. The third sub-gate segment 141 and the fourth sub-gate segment 142 of the negative electrode sub-gate segment 14 are respectively disposed on both sides of the negative electrode main gate line 13 along the first direction A, and the third sub-gate segment 141 and the fourth sub-gate segment 142 are symmetrically arranged along the negative electrode main gate line 13. In one embodiment, the first insulating member 21 on one side of the positive electrode main gate line 11 covers the first sub-gate segment 121, and the first insulating member 21 on the other side of the positive electrode main gate line 11 covers the third sub-gate segment 141, and the first insulating members 21 on both sides of the positive electrode main gate line 11 are staggered along the second direction B. Alternatively, the first insulating member 21 on one side of the negative main grid line 13 covers the fourth sub-grid line segment 142, and the first insulating member 21 on the other side of the negative main grid line 13 covers the second sub-grid line segment 122. The first insulating members 21 on both sides of the negative main grid line 13 are staggered along the second direction B.

[0062] Thus, the staggered arrangement of the first insulating element 21 provides better mechanical support, enhances the structural stability of the entire battery cell assembly 100, and is better able to resist the effects of external physical impacts and environmental factors.

[0063] According to some embodiments of this utility model, such as Figure 8 As shown, the plurality of first insulating elements 21 include a plurality of first sub-insulating elements 211 and a plurality of second sub-insulating elements 212. The first sub-insulating elements 211 and the second sub-insulating elements 212 are respectively disposed on both sides of the main grid line along the first direction A, and the first sub-insulating elements 211 and the second sub-insulating elements 212 are staggered along the second direction B. The first sub-insulating element 211 covers the portion of the positive electrode sub-grid line segment 12 opposite to the first sub-insulating element 211, and the second sub-insulating element 212 covers the portion of the negative electrode sub-grid line segment 14 opposite to the second sub-insulating element 212.

[0064] That is, the first sub-insulator 211 covers the first sub-gate segment 121 on one side of the positive main gate line 11, and the second sub-insulator 212 covers the third sub-gate segment 141 on the other side of the positive main gate line 11; or, the first sub-insulator 211 covers the fourth sub-gate segment 142 on one side of the negative main gate line 13, and the second sub-insulator 212 covers the second sub-gate segment 122 on the other side of the negative main gate line 13, and the first sub-insulator 211 and the second sub-insulator 212 are staggered along the second direction B.

[0065] Thus, the first sub-insulator 211 and the second sub-insulator 212 are staggered on both sides of the main grid line, ensuring comprehensive and uniform electrical isolation.

[0066] According to some embodiments of this utility model, such as Figure 8As shown, the first sub-insulator 211 covers the portion of the positive electrode sub-gate segment 12 opposite to the first sub-insulator 211, and the second insulator 22 covers the free end of the adjacent negative electrode sub-gate segment 14; the second sub-insulator 212 covers the portion of the negative electrode sub-gate segment 14 opposite to the second sub-insulator 212, and the second insulator 22 covers the free end of the adjacent positive electrode sub-gate segment 12.

[0067] The first sub-insulator 211 covers the first sub-gate segment 121 on one side of the positive main grid line 11, and the second insulator 22 covers the fourth sub-gate segment 142 adjacent to the first sub-gate segment 121 near the free end of the positive main grid line 11; the second sub-insulator 212 covers the third sub-gate segment 141 on the other side of the positive main grid line 11, and the second insulator 22 covers the second sub-gate segment 122 adjacent to the third sub-gate segment 141 near the free end of the negative main grid line 13.

[0068] Thus, the first sub-insulator 211 covers the portion of the positive electrode sub-gate line segment 12 opposite to the first sub-insulator 211, preventing short circuits caused by foreign metal objects or solder strip misalignment, and ensuring that the positive electrode sub-gate line segment 12 and the negative electrode main gate line 13 do not directly contact each other. The second insulator 22 covers the free end (i.e., the end not connected to the main gate line) of the adjacent negative electrode sub-gate line segment 14, further isolating the end of the negative electrode sub-gate line segment 14 to prevent it from contacting the opposite gate line or solder strip, thereby preventing short circuits.

[0069] According to some embodiments of this utility model, such as Figures 7-9 As shown, the second insulating member 22 is disposed at the same end of the first sub-insulating member 211 and the second sub-insulating member 212 along the first direction A.

[0070] When the first sub-insulator 211 and the second sub-insulator 212 are staggered along the second direction B, the second insulator 22 is located at the same end of the first sub-insulator 211 and the second sub-insulator 212 along the first direction A. This ensures that the second insulator 22 always covers one end of the non-standard main grid line adjacent to the sub-grid line segment. Further isolation of the free end of the sub-grid line segment ensures that even if a metal foreign object falls or the solder ribbon shifts, it will not come into contact with the non-standard grid line, thereby preventing short circuits and improving the short-circuit resistance of the cell assembly 100.

[0071] According to some embodiments of this utility model, such as Figure 6 As shown, the length of the second insulating member 22 along the second direction B is L2, and L2 satisfies: 0.1mm≤L2≤0.3mm.

[0072] The minimum length of the second insulating member 22 in the first direction A is 0.1 mm, ensuring that the insulating member 20 can cover the sub-grid line segment to provide electrical isolation and prevent short circuits caused by metal foreign objects or solder strip misalignment. The maximum length of the second insulating member 22 in the second direction B is 0.3 mm, avoiding excessive length of the insulating member 20 which would occupy too much space and affect the current collection effect and the effective light-illuminated area of ​​the solar cell 10.

[0073] Therefore, by limiting the length range of the second insulating member 22 in the second direction B, the impact on the effective light-illuminated area of ​​the surface of the battery cell 10 can be reduced while ensuring electrical isolation, thereby improving the photoelectric conversion efficiency.

[0074] The battery string according to a second aspect of the present invention includes the battery cell assembly 100 according to the first aspect of the present invention described above.

[0075] According to the embodiments of the present invention, by applying the battery cell assembly 100 in the above embodiments, the overall safety and reliability of the battery string can be improved, the overall short-circuit resistance of the battery string can be enhanced, and the service life of the battery string can be extended.

[0076] A photovoltaic module according to a third aspect of the present invention includes a cell assembly 100 according to the first aspect of the present invention, or a cell string according to the second aspect of the present invention.

[0077] According to the photovoltaic module of the present invention, by applying the cell assembly 100 or cell string in the above embodiments, the overall safety and reliability of the photovoltaic module can be improved, the overall short-circuit resistance of the photovoltaic module can be enhanced, and the service life of the photovoltaic module can be extended.

[0078] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0079] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0081] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell assembly, characterized in that, The battery piece is provided with a plurality of main grid lines and a plurality of auxiliary grid lines, the plurality of main grid lines comprises a plurality of positive main grid lines and a plurality of negative main grid lines, the plurality of positive main grid lines and the plurality of negative main grid lines are staggered along a first direction, the plurality of auxiliary grid lines comprises a plurality of positive auxiliary grid lines and a plurality of negative auxiliary grid lines, the plurality of positive auxiliary grid lines and the plurality of negative auxiliary grid lines are staggered along a second direction, the positive auxiliary grid line comprises a plurality of positive auxiliary grid line segments, the plurality of positive auxiliary grid line segments are spaced apart along the first direction, and a first opening is defined between adjacent two positive auxiliary grid line segments; the negative auxiliary grid line comprises a plurality of negative auxiliary grid line segments, the plurality of negative auxiliary grid line segments are spaced apart along the first direction, and a second opening is defined between adjacent two negative auxiliary grid line segments; the positive main grid line is arranged at the second opening and is electrically connected with the positive auxiliary grid line segment; and the negative main grid line is arranged at the first opening and is electrically connected with the negative auxiliary grid line segment. An insulating piece is arranged between adjacent positive main grid lines and negative main grid lines, and the insulating piece covers a part of the plurality of positive auxiliary grid line segments and / or the plurality of negative auxiliary grid line segments located between the adjacent positive main grid lines and the negative main grid lines. The insulating piece comprises:

2. The battery sheet assembly of claim 1, wherein, A first insulating piece is arranged between adjacent positive main grid lines and negative main grid lines, The first insulating piece covers the positive auxiliary grid line segment; or The first insulating piece covers the negative auxiliary grid line segment. Further comprising:

3. The battery sheet assembly of claim 2, wherein, A second insulating piece, When the first insulating piece covers the positive auxiliary grid line segment, the second insulating piece is arranged at at least one end of the negative auxiliary grid line segment along the first direction; or When the first insulating piece covers the negative auxiliary grid line segment, the second insulating piece is arranged at at least one end of the positive auxiliary grid line segment along the first direction. The first insulating piece and the second insulating piece are connected with each other along the second direction; or 4. The battery sheet assembly of claim 3, wherein, The first insulating piece and the second insulating piece are spaced apart. The length of the second insulating piece along the first direction is L1, and the L1 satisfies: 1mm≤L1≤5mm.

5. The battery sheet assembly of claim 3, wherein, The first insulating piece is arranged on both sides of the main grid line along the first direction, and the first insulating pieces on both sides of the main grid line are symmetrically arranged along the second direction.

6. The battery sheet assembly of claim 3, wherein, The first insulating piece covers a plurality of positive auxiliary grid line segments between adjacent positive main grid lines and negative main grid lines along the first direction, and the second insulating piece covers a free end of the negative auxiliary grid line segment; or 7. The battery sheet assembly of claim 6, wherein, The first insulating piece covers a plurality of negative auxiliary grid line segments between adjacent positive main grid lines and negative main grid lines along the first direction, and the second insulating piece covers a free end of the positive auxiliary grid line segment. The first insulating piece is arranged on both sides of the main grid line along the first direction, and the first insulating pieces on both sides of the main grid line are staggered along the second direction.

8. The battery sheet assembly of claim 3, wherein, ​ 9. The battery sheet assembly of claim 8, wherein, The first insulating pieces include first sub-insulating pieces and second sub-insulating pieces, the first sub-insulating pieces and the second sub-insulating pieces are respectively arranged on two sides of the main grid lines along the first direction, and the first sub-insulating pieces and the second sub-insulating pieces are staggered along the second direction; The first sub-insulating pieces cover the opposite part of the positive auxiliary grid line segment and the first sub-insulating pieces, and the second sub-insulating pieces cover the opposite part of the negative auxiliary grid line segment and the second sub-insulating pieces.

10. The battery sheet assembly of claim 9, wherein, The first sub-insulating pieces cover the opposite part of the positive auxiliary grid line segment and the first sub-insulating pieces, and the second insulating pieces cover the free end of the adjacent negative auxiliary grid line segment. The second sub-insulating pieces cover the opposite part of the negative auxiliary grid line segment and the second sub-insulating pieces, and the second insulating pieces cover the free end of the adjacent positive auxiliary grid line segment.

11. The battery sheet assembly of claim 9, wherein, The second insulating piece is arranged at the same end of the first sub-insulating piece and the second sub-insulating piece along the first direction.

12. The battery sheet assembly of claim 3, wherein, The length of the second insulating piece along the second direction is L2, and the L2 satisfies: 0.1mm≤L2≤0.3mm.

13. A battery string, characterized by The battery piece assembly according to any one of claims 1-12.

14. A photovoltaic module, characterized by, The battery piece assembly according to any one of claims 1-12, or the battery string according to claim 13.

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