Battery piece assembly and manufacturing method thereof, battery string and photovoltaic assembly

Abstract

The invention discloses a manufacturing method of a battery piece assembly, the battery piece assembly, a battery string and a photovoltaic assembly, and the manufacturing method of the battery piece assembly comprises the following steps: arranging discontinuous first bonding parts on battery pieces; arranging a plurality of auxiliary grid lines and a plurality of connecting grid lines on the battery pieces, the connecting grid lines intersect and are electrically connected with at least two adjacent auxiliary grid lines, the connecting grid lines are only located in the edge area of the battery piece and / or the middle area of the battery piece, and the first bonding pieces are located at the connecting grid lines; placing the interconnection structural member on the battery piece, and enabling the interconnection structural member to be connected with the first bonding member: at least two adjacent auxiliary grid lines are suitable for being connected through a connecting grid line, the interconnection structural member is electrically connected with the connecting grid line, and / or the interconnection structural member is electrically connected with the auxiliary grid line connected with the connecting grid line. Therefore, the first bonding piece can play a role in pre-fixing the interconnection structural piece, the connection grid lines are arranged to collect the current on the auxiliary grid lines and transmit the current to the interconnection structural piece, and the current collection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic modules, and in particular to a method for manufacturing a cell module, a cell module, a cell string and a photovoltaic module. Background Art

[0002] In the prior art, the current between the bus bar set near the edge of the battery cell and the battery cell cannot be collected, resulting in low power of the battery cell assembly, affecting the current transmission efficiency of the battery cell assembly. Alternatively, it is possible to collect the current on the battery cell opposite to the bus bar, but the manufacturing process of the battery cell assembly is relatively complicated. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the first object of the present invention is to provide a method for manufacturing a battery cell assembly, which can improve the reliability and current collection efficiency of the battery cell assembly.

[0004] The second object of the present invention is to provide a battery cell assembly manufactured using the battery cell assembly manufacturing method described in the above embodiment.

[0005] The third object of the present invention is to provide a battery string, comprising the battery cell assembly described in the above embodiment.

[0006] A fourth object of the present invention is to provide a photovoltaic module, comprising the cell module or cell string described in the above embodiment.

[0007] According to the manufacturing method of the battery cell assembly of the first aspect of the embodiment of the present invention, the following steps are included: firstly, a discontinuous first adhesive member is arranged on the battery cell: the battery cell is provided with a plurality of auxiliary grid lines and a plurality of connecting grid lines, the connecting grid lines intersect and are electrically connected with at least two adjacent auxiliary grid lines, the connecting grid lines are only located in the edge area of ​​the battery cell and / or the middle area of ​​the battery cell, and the first adhesive member is located at the connecting grid lines; placing an interconnection structure on the battery cell, and connecting the interconnection structure to the first adhesive member: the at least two adjacent auxiliary grid lines are suitable for being connected through the connecting grid line, the interconnection structure is electrically connected to the connecting grid line and / or the interconnection structure is electrically connected to the auxiliary grid line connected with the connecting grid line.

[0008] According to the manufacturing method of the battery cell assembly of the first aspect embodiment of the present invention, the battery cell is used to collect sunlight and convert solar energy into electrical energy, the interconnection structure is in contact with the auxiliary grid line and the connecting grid line to collect the current generated by the battery cell, and the setting of the first adhesive can pre-fix the interconnection structure, making the assembly of the interconnection structure easier. When the first adhesive affects the contact between the auxiliary grid line and the interconnection structure, the setting of the connecting grid line can collect the current on the auxiliary grid line adjacent to the edge of the battery cell and / or the middle area of ​​the battery cell and transmit it to the interconnection structure, ensuring a reliable electrical connection between multiple auxiliary grid lines on the battery cell and the interconnection structure, thereby improving the current collection efficiency of the battery cell assembly.

[0009] In some embodiments, the discontinuous first adhesive is first set on the battery cell, specifically including: printing or dispensing the first adhesive on the battery cell; the first adhesive is set adjacent to the continuous grid line; and / or the first adhesive is set on the side of the continuous grid line away from the battery cell.

[0010] In some embodiments, placing the interconnection structure on the battery cell and connecting the interconnection structure to the first adhesive specifically includes: placing the interconnection structure on the battery cell so that the interconnection structure is aligned with and in contact with the first adhesive; providing a press on a side of the interconnection structure away from the battery cell, and applying pressure to the interconnection structure through the press so that the secondary grid line is at least partially embedded in the interconnection structure, and along the thickness direction of the battery cell, the distance between the side surface of the interconnection structure away from the battery cell and the side surface of the battery cell is H1, and H1 satisfies: 0.1mm≤H1≤0.3mm.

[0011] In some embodiments, during the process of applying pressure to the interconnection structure by the press, the first adhesive member is spaced apart from the press.

[0012] In some embodiments, after embedding the secondary grid line at least partially into the interconnection structure, the method further includes: curing the first adhesive to preliminarily fix the interconnection structure on the battery cell.

[0013] In some embodiments, after curing the first adhesive, the method further includes: setting a second adhesive on a side of the interconnection structure away from the battery cell: the second adhesive extends along the length direction of the interconnection structure and covers the interconnection structure, and along the thickness direction of the battery cell, the distance between the side surface of the second adhesive away from the battery cell and the side surface of the battery cell is H2, the diameter of the interconnection structure is D, and H2 satisfies: D≤H2≤0.4mm.

[0014] In some embodiments, after providing a second adhesive member on a side of the interconnection structure away from the battery cell, the method further includes: curing the second adhesive member.

[0015] In some embodiments, the material of the first adhesive is UV glue or thermosetting glue; and / or the material of the second adhesive is UV glue or thermosetting glue.

[0016] The battery cell assembly according to the second embodiment of the present invention is manufactured by using the manufacturing method of the battery cell assembly according to the first embodiment of the present invention.

[0017] A battery string according to an embodiment of a third aspect of the present invention comprises a battery cell assembly according to an embodiment of the second aspect of the present invention.

[0018] A photovoltaic module according to an embodiment of a fourth aspect of the present invention comprises a cell sheet assembly according to an embodiment of the second aspect of the present invention, or a cell string according to an embodiment of the third aspect of the present invention.

[0019] 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

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a schematic diagram of a first embodiment of a battery cell and a first adhesive member according to an embodiment of the present invention; Figure 2 is a schematic diagram of a second embodiment of a battery cell and a first adhesive member according to an embodiment of the present invention; Figure 3 is a schematic diagram of a third embodiment of a battery cell and a first adhesive member according to an embodiment of the present invention; Figure 4 is a schematic diagram of an interconnection structure according to an embodiment of the present invention; Figure 5 is a schematic diagram of an embodiment of a battery cell assembly according to an embodiment of the present invention; Figure 6 is a schematic diagram of another embodiment of a battery cell assembly according to an embodiment of the present invention; Figure 7 is a cross-sectional schematic diagram of a battery cell, an interconnection structure and a gate line before being compressed according to an embodiment of the present invention; Figure 8 is a schematic cross-sectional view of a battery cell, an interconnection structure and a gate line after being compressed according to an embodiment of the present invention; Fig. 9is a schematic cross-sectional view of a battery cell assembly according to an embodiment of the present invention.

[0021] Reference numerals: 100. Battery cell assembly; 10. Battery cell; 11. Interconnection structure; 111. Substrate; 112. Solder layer; 12. First adhesive; 13. Second adhesive; 14. Secondary grid line; 15. Intermittent grid line; 16. Continuous grid line; 17. Connecting grid line; 18. First connecting grid line; 19. Second connecting grid line; A, first direction; B, second direction; C, thickness direction. DETAILED DESCRIPTION

[0022] 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 9 A method for manufacturing the battery cell assembly 100 according to an embodiment of the present invention is described.

[0023] Specifically, as 1- Fig. 9 As shown, the manufacturing method of the battery cell assembly 100 includes the following steps: firstly setting a discontinuous first adhesive member 12 on the battery cell 10: the battery cell 10 is provided with a plurality of auxiliary grid lines 14 and a plurality of connecting grid lines 17, the connecting grid lines 17 intersect and are electrically connected with at least two adjacent auxiliary grid lines 14, the connecting grid lines 17 are only located in the edge area of ​​the battery cell 10 and / or the middle area of ​​the battery cell 10, and the first adhesive member 12 is located at the connecting grid lines 17; placing an interconnection structure 11 on the battery cell 10, and connecting the interconnection structure 11 to the first adhesive member 12: at least two adjacent auxiliary grid lines 14 are suitable for being connected through the connecting grid lines 17, the interconnection structure 11 is electrically connected to the connecting grid lines 17 and / or the interconnection structure 11 is electrically connected to the auxiliary grid lines 14 connected with the connecting grid lines 17.

[0024] Combination Figure 1-Figure 4 The cell assembly 100 has a first direction A and a second direction B. A plurality of secondary grid lines 14 are arranged on the surface of the cell 10. The plurality of secondary grid lines 14 extend along the first direction A of the cell assembly 100. The plurality of secondary grid lines 14 are evenly spaced along the second direction B of the cell assembly 100 on one side surface of the cell 10 along the thickness direction C. The connecting grid lines 17 extend along the second direction B. The length of the connecting grid lines 17 in the second direction B is relatively short. The connecting grid lines 17 are arranged perpendicular to the secondary grid lines 14. The connecting grid lines 17 intersect and are electrically connected with at least two adjacent secondary grid lines 14 at right angles. The connecting grid lines 17 include a plurality of connecting grid lines 17. The plurality of connecting grid lines 17 are spaced along the first direction A. The plurality of connecting grid lines 17 are respectively connected to the secondary grid lines 14 located at the edges of both sides of the cell 10 along the second direction B, and / or the plurality of connecting grid lines 17 are connected to the secondary grid lines 14 located in the middle area of ​​the cell 10 along the second direction B.

[0025] First, a first adhesive 12 is prepared on the surface of the battery cell 10, and the first adhesive 12 is arranged at the connection grid line 17, and then the interconnection structure 11 is placed on the battery cell 10, and the interconnection structure 11 extends along the second direction B, so that the interconnection structure 11 is arranged parallel to the second direction B of the battery cell assembly 100, and the interconnection structure 11 and the first adhesive 12 are aligned along the thickness direction C of the battery cell 10, so that the interconnection structure 11 and the first adhesive 12 are connected, and the first adhesive 12 plays a role in preliminarily fixing the interconnection structure 11. The interconnection structure 11 includes a plurality of interconnection structures 11, and the plurality of interconnection structures 11 are arranged on the surface of the battery cell 10 in parallel and spaced along the first direction A, and the interconnection structure 11 is electrically connected to the plurality of secondary grid lines 14, and the end of the interconnection structure 11 adjacent to the edge of the battery cell 10 and / or the middle of the interconnection structure 11 along its extension direction is electrically connected to the connection grid line 17.

[0026] According to the manufacturing method of the battery cell assembly 100 of the first aspect embodiment of the present invention, the battery cell 10 is used to collect sunlight and convert solar energy into electrical energy, the interconnection structure 11 is in contact with the auxiliary grid line 14 and the connecting grid line 17 to collect the current generated by the battery cell 10, and the setting of the first adhesive 12 can pre-fix the interconnection structure 11, so that the assembly of the interconnection structure 11 is easier. When the first adhesive 12 affects the contact between the auxiliary grid line 14 and the interconnection structure 11, the setting of the connecting grid line 17 can collect the current on the auxiliary grid line 14 adjacent to the edge of the battery cell 10 and / or the middle area of ​​the battery cell 10 and transmit it to the interconnection structure 11, ensuring the reliable electrical connection between the multiple auxiliary grid lines 14 on the battery cell 10 and the interconnection structure 11, thereby improving the current collection efficiency of the battery cell assembly 100.

[0027] In some embodiments, as in 1- Figure 3 As shown, the connection gate line 17 includes a first connection gate line 18 and a second connection gate line 19 which are arranged at intervals along the extension direction of the auxiliary gate line 14, and the interconnection structure 11 and the first adhesive member 12 are both arranged between the first connection gate line 18 and the second connection gate line 19. The first connection gate line 18 and the second connection gate line 19 extend along the second direction B, and the first connection gate line 18 and the second connection gate line 19 are arranged at intervals along the first direction A, and the first connection gate line 18 and the second connection gate line 19 are both connected to a plurality of auxiliary gate lines 14.

[0028] Therefore, the arrangement of the first connecting grid line 18 and the second connecting grid line 19 can disperse the current more evenly and improve the efficiency of current collection. The interconnection structure 11 and the first adhesive member 12 are arranged between the first connecting grid line 18 and the second connecting grid line 19, which can facilitate the arrangement of the first adhesive member 12 on the battery cell 10, reduce the production difficulty of the battery cell assembly 100, and also reduce the shielding area of ​​the first adhesive member 12 on the secondary grid line 14, thereby improving the efficiency of current collection.

[0029] According to some embodiments of the present invention, Figure 1-Figure 3 As shown, a discontinuous first adhesive 12 is first arranged on the battery cell 10, specifically including: printing or dispensing the first adhesive 12 on the battery cell 10; the first adhesive 12 is arranged adjacent to the continuous grid line 16; and / or the first adhesive 12 is arranged on the side of the continuous grid line 16 away from the battery cell 10.

[0030] The adhesive material is printed on the designated position of the surface of the battery cell 10 by printing, or the adhesive material is applied to the designated position of the surface of the battery cell 10 by a dispensing machine to form a discontinuous first adhesive member 12. The first adhesive member 12 is arranged adjacent to the continuous grid line 16 along the second direction B of the battery cell 10, and / or the first adhesive member 12 is arranged on the side of the continuous grid line 16 away from the battery cell 10 along the second direction B of the battery cell 10.

[0031] Therefore, printing or dispensing the first adhesive member 12 on the battery cell 10 facilitates automated production of the battery cell assembly 100 , improves the placement accuracy of the first adhesive member 12 , and improves the production efficiency of the battery cell assembly 100 .

[0032] In some embodiments, Figure 1-Figure 3 As shown, first adhesive members 12 are respectively provided at both side edges of the battery cell 10 along the extension direction of the interconnection structure 11 , and at least one first adhesive member 12 is provided between the first adhesive members 12 at both side edges of the battery cell 10 along the extension direction of the interconnection structure 11 .

[0033] In some embodiments, one interconnection structure 11 may correspond to two first adhesive members 12, and the two first adhesive members 12 are respectively connected to the two ends of the interconnection structure 11 along the second direction B. In some embodiments, one interconnection structure 11 corresponds to three first adhesive members 12, and the three first adhesive members 12 are arranged at intervals along the second direction B, wherein two first adhesive members 12 are respectively arranged adjacent to the two side edges of the battery cell 10 along the second direction B, and one first adhesive member 12 is located in the middle of the battery cell 10 along the second direction B.

[0034] The first adhesive members 12 are respectively provided at the edges of both sides of the battery cell 10 along the extension direction of the interconnection structure 11, which can ensure the fixation of both ends of the interconnection structure 11 in the edge regions of both sides, increase the mechanical stability of the edge regions of the battery cell 10, and prevent the interconnection structure 11 from loosening or falling off in the edge regions. At least one first adhesive member 12 is provided between the first adhesive members 12 at the edges of both sides of the battery cell 10 along the extension direction of the interconnection structure 11 to ensure the fixation of the middle region of the interconnection structure 11, thereby improving the overall mechanical stability.

[0035] Preferably, combined Figure 1-Figure 3 The first adhesive member 12 is disposed in the gap between adjacent secondary grid lines 14 to prevent the first adhesive member 12 from blocking the area of ​​the secondary grid lines 14 and affecting the current collection effect. The plurality of secondary grid lines 14 include discontinuous grid lines 15 and continuous grid lines 16. The discontinuous grid lines 15 include a plurality of grid line segments. Two adjacent grid line segments are separated by a connecting grid line 17. Two ends of the grid line segment are respectively connected to a first connecting grid line 18 and a second connecting grid line 19 of two adjacent connecting grid lines 17. The connecting grid line 17 extends to the continuous grid line 16. The first adhesive member 12 is located between the two adjacent continuous grid lines 16.

[0036] The discontinuous grid lines 15 are arranged on at least one side edge of the cell 10 along the extension direction of the interconnection structure 11, and the continuous grid lines 16 are arranged on one side of the discontinuous grid lines 15 adjacent to the center of the cell 10. A plurality of discontinuous grid lines 15 are respectively arranged on both side edges of the cell 10 along the cell assembly 100 along the second direction B, a plurality of connecting grid lines 17 are arranged between the discontinuous grid lines 15, and the first adhesive member 12 is arranged between two adjacent continuous grid lines 16.

[0037] Thus, by arranging the first adhesive 12 between two adjacent continuous grid lines 16, the first adhesive 12 can be prevented from contacting the secondary grid line 14, reducing the contact area between the secondary grid line 14 and the interconnection structure 11, so that the interconnection structure 11 can collect current more effectively and improve the overall current collection efficiency. By properly arranging the first adhesive 12, the structural stability of the connection between the interconnection structure 11 and the battery cell 10 can be enhanced.

[0038] According to some embodiments of the present invention, Figure 4 , Figure 7 and Figure 8 As shown, the interconnection structure 11 is placed on the battery cell 10, and the interconnection structure 11 is connected to the first adhesive 12, specifically including: placing the interconnection structure 11 on the battery cell 10, aligning and contacting the interconnection structure 11 with the first adhesive 12; arranging a press on the side of the interconnection structure 11 away from the battery cell 10, and applying pressure to the interconnection structure 11 through the press, so that the secondary grid line 14 is at least partially embedded in the interconnection structure 11, along the thickness direction C of the battery cell 10, the distance between the side surface of the interconnection structure 11 away from the battery cell 10 and the side surface of the battery cell 10 is H1, and H1 satisfies: 0.1mm≤H1≤0.3mm.

[0039] The interconnection structure 11 is placed on the battery cell 10 so that it is placed parallel to the second direction B of the battery cell assembly 100. Ensure that the interconnection structure 11 is aligned with the first adhesive 12 along the thickness direction C of the battery cell 10, so that the interconnection structure 11 is in contact with the first adhesive 12. A press is set on the side of the interconnection structure 11 away from the battery cell 10 along the thickness direction C of the battery cell 10, and a uniform pressure is applied to the interconnection structure 11 by the press, so that the interconnection structure 11 is tightly combined with the first adhesive 12, so that the secondary grid line 14 is at least partially embedded in the interconnection structure 11, and good contact between the secondary grid line 14 and the interconnection structure 11 is achieved to form a stable connection. The height of the interconnection structure 11 in the thickness direction C of the battery cell 10 is H1. If the height of the interconnection structure 11 in the thickness direction C of the battery cell 10 is less than 0.1 mm, the thickness of the interconnection structure 11 is too small, resulting in poor structural strength of the interconnection structure 11, and the interconnection structure 11 is prone to breakage. If the height of the interconnection structure 11 along the thickness direction C of the battery cell 10 is greater than 0.3 mm, the thickness of the interconnection structure 11 is too large, which is not conducive to reducing the material usage.

[0040] Thus, the pressure is applied to the interconnection structure 11 by the press, so that the interconnection structure 11 contacts the first adhesive 12, and the secondary grid line 14 is at least partially embedded in the interconnection structure 11, ensuring good connection contact and mechanical stability. By limiting the height range of the interconnection structure 11 along the thickness direction C of the battery cell 10, the current transmission efficiency can be guaranteed while ensuring the mechanical strength of the interconnection structure 11, while reducing the production cost of the battery cell assembly 100.

[0041] In some embodiments, Figure 7-Figure 9 As shown, the interconnection structure 11 includes: a substrate 111 and a solder layer 112 . The solder layer 112 is disposed on the outer peripheral side of the substrate 111 , and at least a portion of the secondary gate line 14 is embedded in the solder layer 112 .

[0042] The substrate 111 is the base material of the interconnection structure 11, which is usually a metal material (such as a copper strip, an aluminum strip, etc.), and is used to carry the solder layer 112 and provide a current transmission path. The solder layer 112 is arranged on the outer peripheral side of the substrate 111, and is used to form an electrical connection with the auxiliary grid line 14. The solder layer 112 is usually made of a material that is easy to solder (such as a tin-lead alloy, a lead-free solder, etc.). At least part of the auxiliary grid line 14 is embedded in the solder layer 112, that is, the connection between the auxiliary grid line 14 and the interconnection structure 11 is not a simple surface contact, but a tighter combination is achieved through the solder layer 112.

[0043] Thus, by partially embedding the auxiliary grid line 14 into the solder layer 112, good electrical contact between the auxiliary grid line 14 and the interconnection structure 11 can be ensured, contact resistance can be reduced, and current transmission efficiency can be improved. The solder layer 112 not only provides electrical connection, but also enhances the physical connection between the auxiliary grid line 14 and the interconnection structure 11, making the entire battery cell assembly 100 more stable and reducing the risk of loosening or breaking due to external forces. The design of the solder layer 112 makes the connection between the auxiliary grid line 14 and the interconnection structure 11 more reliable, and can maintain stable performance even in long-term use or harsh environments.

[0044] According to some embodiments of the present invention, Figure 7 and Figure 8 As shown, in the process of applying pressure to the interconnection structure 11 by the press, the first adhesive member 12 is spaced apart from the press.

[0045] That is, ensure that the first adhesive 12 is always arranged between the side surface of the battery cell 10 along the thickness direction C and the side surface of the interconnection structure 11 adjacent to the battery cell 10 along the thickness direction C, or, when the first adhesive 12 overflows toward the outer peripheral side of the interconnection structure 11 under pressure, there is always a certain gap between the first adhesive 12 and the press to prevent the press from directly contacting the first adhesive 12.

[0046] Therefore, when the presses fix or compact the interconnected structural member 11, the first adhesive member 12 will not contact these presses, thereby avoiding adhesion problems, keeping the press surface clean, and ensuring the integrity of the first adhesive member 12, ensuring the bonding performance of the first adhesive member 12.

[0047] According to some embodiments of the present invention, Fig. 9 As shown, after the secondary grid line 14 is at least partially embedded in the interconnection structure 11 , the method further includes: curing the first adhesive 12 to preliminarily fix the interconnection structure 11 on the battery cell 10 .

[0048] After ensuring good contact between the interconnection structure 11 and the secondary grid line 14 , the press is removed. According to the characteristics of the adhesive material used, appropriate curing conditions are selected. Common curing methods include thermal curing and UV curing, so that the first adhesive 12 is completely cured on the cell 10 .

[0049] Therefore, the cured first adhesive 12 can firmly fix the interconnection structure 11 on the battery cell 10 to prevent the interconnection structure 11 from loosening or falling off, thereby improving the overall stability and reliability of the battery cell assembly 100 .

[0050] According to some embodiments of the present invention, Figure 5 and Figure 6As shown, after curing the first adhesive 12, it also includes: setting a second adhesive 13 on the side of the interconnection structure 11 away from the battery cell 10: the second adhesive 13 extends along the length direction of the interconnection structure 11 and covers the interconnection structure 11, along the thickness direction C of the battery cell 10, the distance between the side surface of the second adhesive 13 away from the battery cell 10 and the side surface of the battery cell 10 is H2, the diameter of the interconnection structure 11 is D, and H2 satisfies: D≤H2≤0.4mm.

[0051] A second adhesive 13 is prepared on a side of the interconnection structure 11 away from the battery cell 10 along the thickness direction C of the battery cell 10, the second adhesive 13 extends along the second direction B, the width of the second adhesive 13 along the first direction A is greater than the width of the interconnection structure 11 in the first direction A, the second adhesive 13 is arranged on a side of the interconnection structure 11 away from the battery cell 10 along the thickness direction C of the battery cell 10, the second adhesive 13 extends along the length direction of the interconnection structure 11 and covers the interconnection structure 11, and the two side edges of the second adhesive 13 along the second direction B are suitable for bonding with the surface of the battery cell 10.

[0052] The height of the second adhesive 13 in the thickness direction C of the battery cell 10 is between the diameter D of the interconnection structure 11 and 0.4 mm. The diameter D of the interconnection structure 11 ensures that the second adhesive 13 has sufficient area and thickness to cover the interconnection structure 11 to provide the necessary bonding force and ensure the mechanical fixation between the interconnection structure 11 and the battery cell 10. The maximum size of 0.4 mm avoids the second adhesive 13 from being too high in the thickness direction C of the battery cell 10, reducing material waste.

[0053] Thus, the second adhesive 13 can further fix the interconnection structure 11 on the cell 10, ensuring that the contact between the secondary grid line 14 and the interconnection structure 11 will not loosen under the action of external stress, further improving the reliability and stability of the connection between the interconnection structure 11 and the cell 10. By limiting the size range of the second adhesive 13, the connection between the interconnection structure 11 and the cell 10 is further strengthened, the stability of the connection between the interconnection structure 11 and the cell 10 is increased, and at the same time, the material used for the second adhesive 13 is reduced, thereby reducing the production cost of the cell assembly 100.

[0054] According to some embodiments of the present invention, Figure 5 and Figure 6 As shown, after the second adhesive 13 is disposed on the side of the interconnection structure 11 away from the battery cell 10 , the process further includes: curing the second adhesive 13 .

[0055] According to the characteristics of the adhesive material used, appropriate curing conditions are selected. Common curing methods include thermal curing and UV curing, so that the second adhesive 13 is completely cured on the battery cell 10 .

[0056] Therefore, the cured second adhesive 13 can firmly fix the interconnection structure 11 on the battery cell 10. The double fixation of the first adhesive 12 and the second adhesive 13 ensures a stable connection between the interconnection structure 11 and the battery cell 10, further improving the overall structural strength of the battery cell assembly 100 and improving the stability and reliability of the battery cell assembly 100.

[0057] According to some embodiments of the present invention, the material of the first adhesive member 12 is UV adhesive or thermosetting adhesive; and / or the material of the second adhesive member 13 is UV adhesive or thermosetting adhesive.

[0058] UV glue can cure quickly under ultraviolet light and is suitable for production processes that require fast assembly. UV glue usually has high transparency and will not affect the light absorption of the battery cell 10. UV glue has good chemical stability, is not easily affected by environmental factors, and is suitable for long-term use. Thermosetting adhesives cure under heating conditions and have high strength after curing, making them suitable for applications that require high-strength connections. Thermosetting adhesives can still maintain good bonding properties in high temperature environments and are suitable for use of solar panels under various temperature conditions. Thermosetting adhesives have good anti-aging properties and can maintain bonding strength for a long time.

[0059] Therefore, the first adhesive 12 and the second adhesive 13 are UV adhesive or thermosetting adhesive, which can improve the production efficiency of the battery cell assembly 100, while ensuring that the interconnection structure 11 is firmly fixed on the battery cell 10, thereby improving the overall performance of the battery cell assembly 100.

[0060] The battery cell assembly 100 according to the second embodiment of the present invention is manufactured by using the manufacturing method of the battery cell assembly 100 according to the first embodiment of the present invention.

[0061] The battery cell assembly 100 according to the embodiment of the present invention is manufactured by adopting the manufacturing method of the battery cell assembly 100 according to the above embodiment, which can effectively improve the production efficiency of the battery cell assembly 100 and enhance the overall structural stability and reliability of the battery cell assembly 100.

[0062] The battery string according to the third embodiment of the present invention comprises the battery cell assembly 100 according to the second embodiment of the present invention.

[0063] The battery string according to the embodiment of the present invention can effectively improve the structural stability of the battery string, improve the current collection effect of the battery string, and thus improve the overall performance of the battery string by applying the battery cell assembly 100 in the above embodiment.

[0064] A photovoltaic module according to an embodiment of a fourth aspect of the present invention comprises the cell assembly 100 according to an embodiment of the second aspect of the present invention, or a cell string according to an embodiment of the third aspect of the present invention.

[0065] The photovoltaic module according to the embodiment of the present invention can effectively improve the current collection efficiency of the photovoltaic module, enhance the structural stability and reliability, improve the processing convenience of the photovoltaic module, and ensure the stable operation of the photovoltaic module in various environments by applying the cell module 100 or the cell string in the above embodiment.

[0066] 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", "clockwise", "counterclockwise", "axial", "radial", "circumferential" 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0067] In the description of the present invention, "first feature" and "second feature" may include one or more of the features. In the description of the present invention, "plurality" means two or more. In the description of the present invention, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. In the description of the present invention, a first feature "above", "above" and "above" a second feature may include the first feature being directly above and obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature.

[0068] 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.

[0069] 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 method for manufacturing a battery cell assembly, characterized in that: The following steps are involved: A discontinuous first adhesive member is firstly arranged on the battery cell: the battery cell is provided with a plurality of auxiliary grid lines and a plurality of connecting grid lines, the connecting grid lines intersect and are electrically connected with at least two adjacent auxiliary grid lines, the connecting grid lines are only located in the edge area of ​​the battery cell and / or the middle area of ​​the battery cell, and the first adhesive member is located at the connecting grid lines; Place an interconnection structure on the battery cell and connect the interconnection structure to the first adhesive: the at least two adjacent auxiliary grid lines are suitable for connection through the connecting grid line, the interconnection structure is electrically connected to the connecting grid line and / or the interconnection structure is electrically connected to the auxiliary grid line connected to the connecting grid line.

2. The method for manufacturing a battery cell assembly according to claim 1, characterized in that: The step of first providing a discontinuous first adhesive member on the battery cell specifically includes: Printing or dispensing glue on the battery cell to form the first adhesive member; The first adhesive member is disposed adjacent to the continuous grid line; and / or, The first adhesive member is arranged on a side of the continuous grid line away from the battery cell.

3. The method for manufacturing a battery cell assembly according to claim 1, characterized in that: Placing the interconnection structure on the battery cell and connecting the interconnection structure with the first adhesive member specifically includes: Placing the interconnection structure on the battery cell so that the interconnection structure is aligned with and in contact with the first adhesive member; A press is arranged on a side of the interconnection structure away from the battery cell, and pressure is applied to the interconnection structure by the press so that the secondary grid line is at least partially embedded in the interconnection structure. Along the thickness direction of the battery cell, a distance between a side surface of the interconnection structure away from the battery cell and the side surface of the battery cell is H1, and H1 satisfies: 0.1 mm≤H1≤0.3 mm.

4. The method for manufacturing a battery cell assembly according to claim 3, characterized in that: During the process of applying pressure to the interconnection structure by the press, the first adhesive member is spaced apart from the press.

5. The method for manufacturing a battery cell assembly according to claim 3 or 4, characterized in that: After the secondary gate line is at least partially embedded in the interconnection structure, the method further includes: The first adhesive is cured to preliminarily fix the interconnection structure on the battery cell.

6. The method for manufacturing a battery cell assembly according to claim 5, characterized in that: After curing the first adhesive, the method further comprises: A second adhesive member is disposed on a side of the interconnection structure away from the battery cell: the second adhesive member extends along the length direction of the interconnection structure and covers the interconnection structure. Along the thickness direction of the battery cell, the distance between the side surface of the second adhesive component away from the battery cell and the side surface of the battery cell is H2, the diameter of the interconnection structure is D, and H2 satisfies: D≤H2≤0.4mm.

7. The method for manufacturing a battery cell assembly according to claim 6, characterized in that: After the second adhesive member is disposed on a side of the interconnection structure away from the battery sheet, the method further includes: The second adhesive is cured.

8. The method for manufacturing a battery cell assembly according to claim 6, characterized in that: The material of the first adhesive is UV glue or thermosetting glue; and / or, The material of the second adhesive is UV glue or thermosetting glue.

9. A battery cell assembly manufactured by the method for manufacturing a battery cell assembly according to any one of claims 1 to 8.

10. A battery string, characterized in that: Comprising the battery cell assembly according to claim 9.

11. A photovoltaic module, characterized in that: It comprises the battery cell assembly according to claim 9, or the battery string according to claim 10.

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