A battery string, a photovoltaic module and a method of producing a battery string

Abstract

This invention discloses a battery string, a photovoltaic module, and a method for manufacturing the battery string, relating to the field of photovoltaic technology. The battery string includes multiple battery cells and multiple conductive interconnect strips. The multiple battery cells are arranged parallel and spaced apart along a first direction, with a gap region formed between adjacent battery cells. Multiple conductive interconnect strips are arranged spaced apart along a second direction and extend along the first direction. Each conductive interconnect strip is simultaneously welded to multiple battery cells, wherein the first direction is perpendicular to the second direction. A laser-cutting area is provided at a preset position on each conductive interconnect strip, located within the gap region, and the width of the laser-cutting area is 0.2mm-0.8mm. The battery string provided by this invention enables rapid cutting of the conductive interconnect strips, saving time and effort, shortening the cutting cycle, improving cutting efficiency, and facilitating control of the breakpoint spacing, enhancing the cutting effect, and improving cutting accuracy.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, and more specifically, to a battery string, a photovoltaic module, and a method for producing the battery string. Background Technology

[0002] Currently, back-contact solar cells, which have all metal grid lines located on the back side of the cell, are widely used due to their unobstructed front side, which effectively increases output power. In back-contact solar cells, the positive and negative grid lines are alternately arranged on the back side. When forming a cell string, the main grids of different polarities of adjacent cells are aligned, or pre-defined solder joint areas are used. Two cells are then connected in series by soldering onto these grids, thus completing the connection between the electrodes of different polarities between adjacent cells.

[0003] To connect adjacent solar cells in series, the solder strip between adjacent cells needs to be cut regularly. Currently, the solder strip is usually cut with a cutter. However, to ensure that the two cut points of the solder strip maintain a certain distance (to prevent the two cut points from contacting and causing a short circuit), it needs to be cut twice along the length of the solder strip. This process is time-consuming and labor-intensive, with a long cutting cycle and low cutting efficiency. Furthermore, the interval between the two cuts is difficult to control, resulting in inconsistent spacing between the cut points at various locations, poor cutting effect, and low cutting accuracy.

[0004] In view of this, designing a production method for battery strings, photovoltaic modules, and battery strings with high cutting efficiency and good cutting effect is particularly important in the production of photovoltaic modules. Summary of the Invention

[0005] The purpose of this invention is to provide a battery string that can quickly cut off the conductive interconnect strip, saving time and effort, shortening the cutting cycle, improving cutting efficiency, and facilitating control of the spacing between the cut points, thereby enhancing the cutting effect and improving cutting accuracy.

[0006] Another objective of this invention is to provide a photovoltaic module that enables rapid cutting of conductive interconnect strips, saving time and effort, shortening the cutting cycle, improving cutting efficiency, and facilitating control of the spacing between cut points, thereby enhancing the cutting effect and improving cutting accuracy.

[0007] Another objective of this invention is to provide a method for producing battery strings that is simple in steps, enables rapid cutting of conductive interconnects, saves time and effort, shortens the cutting cycle, improves cutting efficiency, and facilitates control of the spacing between breakpoints, thereby enhancing the cutting effect and improving cutting accuracy.

[0008] The present invention is achieved by the following technical solution.

[0009] A battery string includes multiple battery cells and multiple conductive interconnect strips. The multiple battery cells are arranged in parallel and spaced apart along a first direction, with a gap region formed between adjacent battery cells. The multiple conductive interconnect strips are arranged at intervals along a second direction and extend along the first direction. Each conductive interconnect strip is simultaneously welded to multiple battery cells, wherein the first direction is perpendicular to the second direction. The conductive interconnect strip has a laser cutting area set at a preset position, which is located within the interval area, and the width of the laser cutting area is 0.2mm-0.8mm.

[0010] Alternatively, the conductive interconnect strip can be one of solder strip, stacked grid structure, or copper wire.

[0011] Optionally, the preset positions of two adjacent conductive interconnect strips are staggered and located in two different interval regions.

[0012] Optionally, the conductive interconnect strip includes a main body, a fractured suspended portion, and a connected suspended portion. There are multiple main bodies, at least one set of fractured suspended portions, with two fractured suspended portions in each set, and at least one connected suspended portion. Each main body is welded to a solar cell, and each set of fractured suspended portions and each connected suspended portion are arranged in at least two interval regions in a one-to-one correspondence. The distance between the two fractured suspended portions in each set is 0.2mm-0.8mm.

[0013] Optionally, the distance between two fractured suspended parts in any group satisfies the following relationship: (L - L') / L' ≤ ±10%; In the formula, the average distance between two fractured suspended parts in multiple groups is L', and the distance between two fractured suspended parts in a certain group is L.

[0014] Optionally, the surfaces of the fractured suspended portion and part of the main body are provided with an uneven structure.

[0015] Optionally, the maximum height difference between the concave and convex structures is greater than 0.05 micrometers; And / or, the length of the concave-convex structure along the extension direction of the conductive interconnect strip is 0.5mm-1.5mm.

[0016] A photovoltaic module includes the above-mentioned battery string, which includes multiple battery cells and multiple conductive interconnect strips. The multiple battery cells are arranged in parallel and spaced apart along a first direction, and a gap region is formed between two adjacent battery cells. The multiple conductive interconnect strips are arranged in a second direction and extend along the first direction. Each conductive interconnect strip is simultaneously welded to multiple battery cells, wherein the first direction is perpendicular to the second direction. The conductive interconnect strip has a laser cutting area set at a preset position, which is located within the interval area, and the width of the laser cutting area is 0.2mm-0.8mm.

[0017] A method for producing battery strings, comprising: Multiple battery cells are welded together by using multiple conductive interconnect strips that are arranged parallel to each other along a first direction. The multiple conductive interconnect strips are arranged at intervals along a second direction and extend along the first direction, with the first direction being perpendicular to the second direction. Each conductive interconnect strip is laser-cut at a preset position, wherein the preset position is located in the interval area formed between two adjacent solar cells, and the width of the laser-cut area is 0.2mm-0.8mm.

[0018] Optionally, in the step of performing a one-time laser cut at a preset position of each conductive interconnect strip, the laser power is 1.5kW-8kW.

[0019] Optionally, the conductive interconnecting strip includes a main body, a broken and suspended part, and a cut-off part connected in sequence. The main body is welded to the battery cell, and the broken and suspended part and the cut-off part are both arranged to protrude from the edge of the battery cell. The cut-off part is located at a preset position. In the step of laser cutting at a preset position for each conductive interconnect strip, the laser is used to eliminate the cut part, and at the same time, the heat generated by the laser ablates the surface of the fractured suspended part and part of the main body to form a concave-convex structure.

[0020] The battery string, photovoltaic module, and battery string production method provided by this invention have the following beneficial effects: The battery string provided by this invention comprises multiple battery cells arranged parallel and spaced apart along a first direction, with a gap region formed between adjacent battery cells. Multiple conductive interconnecting strips are arranged spaced apart along a second direction and extend along the first direction. Each conductive interconnecting strip is simultaneously welded to multiple battery cells, wherein the first direction is perpendicular to the second direction. Each conductive interconnecting strip has a laser-cutting area at a preset position within the gap region, and the width of the laser-cutting area is 0.2mm-0.8mm. Compared with existing technologies, the battery string provided by this invention, due to the use of conductive interconnecting strips with laser-cutting areas at preset positions, enables rapid cutting of the conductive interconnecting strips, saving time and effort, shortening the cutting cycle, improving cutting efficiency, and facilitating control of the breakpoint spacing, thus enhancing the cutting effect and improving cutting accuracy.

[0021] The photovoltaic module provided by the present invention includes a battery string, which can realize the rapid cutting of conductive interconnects, saving time and effort, shortening the cutting cycle, improving cutting efficiency, and facilitating the control of the spacing between the cut points, thereby enhancing the cutting effect and improving the cutting accuracy.

[0022] The battery string production method provided by this invention is simple in steps, can quickly cut the conductive interconnect strip, saves time and effort, shortens the cutting cycle, improves cutting efficiency, and facilitates control of the spacing between the cut points, thereby enhancing the cutting effect and improving cutting accuracy. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a photovoltaic module provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the battery string structure provided in an embodiment of the present invention; Figure 3 for Figure 2 A magnified view of a section of section III; Figure 4 This is a schematic diagram of the connection between the conductive interconnect strip and the battery cells in a battery string provided in an embodiment of the present invention.

[0025] Icons: 10-Photovoltaic module; 100-Battery string; 110-Battery cell; 111-Positive electrode fine grid line; 112-Negative electrode fine grid line; 120-Conductive interconnection strip; 121-Main body; 122-Broken suspended part; 123-Connected suspended part; 130-Gap area; 140-Concave-convex structure. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this invention, it should be noted that the terms "inner," "outer," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the invention and simplifying the description, and do not 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 the invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, features in the following embodiments can be combined with each other.

[0032] Please refer to the reference. Figures 1 to 4 This invention provides a photovoltaic module 10 for photovoltaic power generation. It enables rapid cutting of the conductive interconnect strip 120, saving time and effort, shortening the cutting cycle, improving cutting efficiency, and facilitating control of the breakpoint spacing, thus enhancing the cutting effect and improving cutting accuracy.

[0033] It should be noted that the photovoltaic module 10 includes multiple battery strings 100 connected together. The battery strings 100 are used to convert solar energy into electrical energy to realize the photovoltaic power generation function. The multiple battery strings 100 work together to improve the photovoltaic power generation efficiency and increase the photovoltaic power generation.

[0034] The battery string 100 includes multiple battery cells 110 and multiple conductive interconnecting strips 120. The multiple battery cells 110 are arranged parallel to each other along a first direction, with a gap 130 formed between adjacent battery cells 110. The multiple conductive interconnecting strips 120 are arranged at intervals along a second direction and extend along the first direction. Each conductive interconnecting strip 120 is simultaneously welded to multiple battery cells 110, and the multiple conductive interconnecting strips 120 work together to achieve the connection function of the multiple battery cells 110. The first direction is perpendicular to the second direction.

[0035] Optionally, the conductive interconnect strip 120 can be one of solder strip, stacked grid structure, or copper wire.

[0036] Furthermore, the conductive interconnect strip 120 has a laser cutting area at a preset position within the interval region 130, and the width of the laser cutting area is 0.2mm-0.8mm. Specifically, the laser cutting area is cut in one pass by a large-spot laser. During the laser cutting process, a large-spot laser is used to cut the conductive interconnect strip 120 in one pass. Due to the high temperature characteristics of the laser, the laser-cut position on the conductive interconnect strip 120 is completely vaporized and eliminated, thereby achieving the function of cutting the conductive interconnect strip 120 and forming two break points. In this way, the conductive interconnect strip 120 can be cut quickly, saving time and effort, shortening the cutting cycle, improving cutting efficiency, and facilitating the control of the break point spacing, enhancing the cutting effect, and improving cutting accuracy.

[0037] Optionally, the preset positions of two adjacent conductive interconnect strips 120 are staggered and located in two different interval regions 130. That is, within the same interval region 130, the conductive interconnect strips 120 are laser-cut at regular intervals so that two adjacent battery cells 110 can be connected in series.

[0038] The conductive interconnect strip 120 includes a main body 121, a broken suspended portion 122, and a connected suspended portion 123. There are multiple main bodies 121, at least one set of broken suspended portions 122, with two in each set, and at least one connected suspended portion 123. Specifically, each main body 121 is welded to a solar cell 110, and each set of broken suspended portions 122 and each connected suspended portion 123 are correspondingly disposed within at least two spaced regions 130.

[0039] It is understandable that the initial state of the conductive interconnect strip 120 is a single strip. After the entire conductive interconnect strip 120 is simultaneously welded onto multiple battery cells 110, in order to connect adjacent battery cells 110 in series, it is necessary to regularly cut off the conductive interconnect strip 120 between two adjacent battery cells 110 (that is, within the interval region 130). That is, a portion of the conductive interconnect strip 120 within the interval region 130 will be cut off, while another portion of the conductive interconnect strip 120 will not be cut off. The cut-off portion of the conductive interconnect strip 120 forms two opposite and spaced-apart broken suspended portions 122 in a set, while the uncut portion of the conductive interconnect strip 120 forms a connected suspended portion 123.

[0040] Specifically, the spacing between the two broken suspended parts 122 in each group is 0.2mm-0.8mm, that is, the spacing between the two breaks of the conductive interconnecting strip 120 is 0.2mm-0.8mm. The reasonable spacing between the two broken suspended parts 122 in each group can effectively prevent the two broken suspended parts 122 from contacting each other when the battery string 100 is subjected to external force and vibrates, thereby avoiding short circuits and improving safety.

[0041] Furthermore, the spacing between the two fractured suspended portions 122 in any group satisfies the following relationship: (L - L') / L' ≤ ±10%; In the formula, the average distance between the two fractured suspended parts 122 in multiple groups is L', and the distance between the two fractured suspended parts 122 in a certain group is L. That is, the deviation of the distance between the two fractured suspended parts 122 in multiple groups is less than or equal to 10%, the severing effect is good, and the severing accuracy is high.

[0042] It should be noted that the surfaces of the fractured suspended portion 122 and part of the main body portion 121 are provided with an uneven structure 140, which is used to improve structural strength. Specifically, during the laser cutting process, the instantaneous high temperature generated by the laser completely vaporizes and eliminates the laser-cut area of ​​the conductive interconnect strip 120. At the same time, the heat generated by the laser is also transmitted from the break point along the length direction of the conductive interconnect strip 120, causing the tin-containing solder on the surface of a certain length of the conductive interconnect strip 120 to melt and cool rapidly. This ablates the surfaces of the fractured suspended portion 122 and part of the main body portion 121, forming an uneven structure 140. This uneven structure 140 improves the structural strength of the free end of the conductive interconnect strip 120 and can effectively prevent the free end of the conductive interconnect strip 120 from deforming and coming into contact with metals of different polarities, thus preventing short circuits.

[0043] Optionally, the maximum height difference of the concave-convex structure 140 is greater than 0.05 micrometers, that is, the maximum height difference of the concave-convex structure 140 in the thickness direction of the conductive interconnect strip 120 is greater than 0.05 micrometers. A reasonable maximum height of the concave-convex structure 140 can improve the structural strength of the concave-convex structure 140, thereby improving the structural strength of the free end of the conductive interconnect strip 120, preventing the free end of the conductive interconnect strip 120 from bending or shifting synchronously when the battery string 100 is subjected to external force, and avoiding short circuits.

[0044] Optionally, the length of the concave-convex structure 140 along the extension direction of the conductive interconnect strip 120 is 0.5mm-1.5mm, that is, the length of the concave-convex structure 140 in the first direction is 0.5mm-1.5mm. A reasonable length of the concave-convex structure 140 along the extension direction of the conductive interconnect strip 120 can further improve the structural strength of the concave-convex structure 140, thereby improving the structural strength of the free end of the conductive interconnect strip 120, preventing the free end of the conductive interconnect strip 120 from bending or shifting synchronously when the battery string 100 is subjected to external force, and avoiding short circuits.

[0045] In this embodiment, the battery cell 110 is provided with multiple positive electrode fine grid lines 111 and multiple negative electrode fine grid lines 112. The multiple positive electrode fine grid lines 111 are divided into multiple groups, and the multiple positive electrode fine grid lines 111 in each group are spaced apart along a first direction and extend along a second direction; the multiple negative electrode fine grid lines 112 are divided into multiple groups, and the multiple negative electrode fine grid lines 112 in each group are spaced apart along the first direction and extend along the second direction. The multiple groups of positive electrode fine grid lines 111 and multiple groups of negative electrode fine grid lines 112 are arranged alternately along the second direction, and multiple conductive interconnecting strips 120 are spaced apart along the second direction and extend along the first direction. Each conductive interconnecting strip 120 is simultaneously welded to one group of positive electrode fine grid lines 111 or one group of negative electrode fine grid lines 112, forming multiple solder joints to achieve the welding and fixing function of the conductive interconnecting strips 120 and the battery cell 110.

[0046] Furthermore, the positive electrode fine grid line 111 and the negative electrode fine grid line 112 are alternately spaced in the first direction to realize the carrier collection function of the P region and N region of the battery cell 110.

[0047] This invention also provides a method for producing a battery string 100, which includes the following steps: Step S110: Multiple battery cells 110 arranged parallel to each other along a first direction are welded using multiple conductive interconnecting strips 120, wherein the multiple conductive interconnecting strips 120 are arranged at intervals along a second direction and extend along the first direction, and the first direction is perpendicular to the second direction.

[0048] It should be noted that in step S110, multiple conductive interconnect strips 120 are sequentially welded to multiple battery cells 110. Multiple solder joints are formed between each conductive interconnect strip 120 and a battery cell 110. The multiple conductive interconnect strips 120 work together to realize the connection function of multiple battery cells 110.

[0049] Step S120: Perform a one-time laser cut at a preset position of each conductive interconnect strip 120, wherein the preset position is located within the interval region 130 formed between two adjacent battery cells 110, and the width of the laser cut region formed by the laser cut is 0.2mm-0.8mm.

[0050] It should be noted that in step S120, a large spot laser is used to cut the conductive interconnect strip 120 in one go. Due to the high temperature characteristics of the laser, the laser cutting position on the conductive interconnect strip 120 will be completely vaporized and eliminated, thereby realizing the function of cutting the conductive interconnect strip 120, so that the conductive interconnect strip 120 forms two break points. Specifically, the width of the laser-cut area formed by laser cutting is 0.2mm-0.8mm, and correspondingly, the diameter of the laser spot is approximately 0.2mm-0.8mm. The width of the laser-ablated area is 0.2mm-0.8mm, thus ensuring that the distance between the two breakpoints formed by the cutting of the conductive interconnect strip 120 is 0.2mm-0.8mm. In other words, the distance between the two suspended fracture parts 122 in each group is 0.2mm-0.8mm. By reasonably controlling the diameter of the large-spot laser, it is possible to ensure that the distance between the two suspended fracture parts 122 in each group meets the requirements, effectively preventing the two suspended fracture parts 122 from contacting each other when the battery string 100 is subjected to external force and vibrates, avoiding short circuits and improving safety.

[0051] Furthermore, during the laser cutting of multiple conductive interconnect strips 120, the diameter of the laser spot remains constant, ensuring that the spacing between the breakpoints formed by the cuts of the multiple conductive interconnect strips 120 is the same or similar. Specifically, the deviation in the spacing between the breakpoints formed by the cuts of the multiple conductive interconnect strips 120 is less than or equal to 10%, meaning that the deviation in the spacing between the two broken suspended portions 122 in multiple groups is less than or equal to 10%. In this way, by performing a single laser cut at a preset position for each conductive interconnect strip 120, the number of cuts can be reduced (existing technology requires two cuts), achieving rapid cutting of the conductive interconnect strips 120, saving time and effort, shortening the cutting cycle, and improving cutting efficiency. Furthermore, it facilitates control of the breakpoint spacing (deviation less than or equal to 10%), enhancing the cutting effect and improving cutting accuracy.

[0052] Optionally, in step S120, the laser power is 1.5kW-8kW, which is within a relatively high range. Specifically, during the laser cutting process, the conductive interconnect strip 120 is irradiated with instantaneous high power of the laser to generate instantaneous high temperature, thereby vaporizing and eliminating part of the conductive interconnect strip 120 material to form a laser cutting area of ​​the required width (i.e., a laser ablation area, with a width of 0.2mm-0.8mm). In this process, the laser only needs to act once to form the laser cutting area, significantly improving the processing accuracy and avoiding short circuit problems caused by incomplete removal of conductive interconnect strip 120 waste from the laser cutting area. Furthermore, since the conductive interconnect strip 120 waste in the laser cutting area is completely vaporized by the laser, no solid waste is generated, thus avoiding the problem of lamination fragmentation caused by waste splashing onto the surface of the battery cell 110, and improving the product quality of the battery string 100.

[0053] It should be noted that before the conductive interconnect strip 120 is cut off, the conductive interconnect strip 120 also includes a cut-off portion (not shown in the figure). The main body 121, the broken suspended portion 122, and the cut-off portion are connected in sequence. The main body 121 is welded to the battery cell 110. Both the broken suspended portion 122 and the cut-off portion protrude from the edge of the battery cell 110, that is, both the broken suspended portion 122 and the cut-off portion are located within the interval region 130, while the cut-off portion is located at a preset position. In step S120, the cut-off portion is eliminated using a laser, and at the same time, the heat generated by the laser ablates the surface of the broken suspended portion 122 and part of the main body 121 to form a concave-convex structure 140. Specifically, during the laser cutting process, the instantaneous high temperature generated by the laser completely vaporizes and eliminates the laser-cut area (i.e. the cut portion) of the conductive interconnect strip 120. At the same time, the heat generated by the laser is also transmitted from the break point along the length direction of the conductive interconnect strip 120, so that the tin-containing solder on the surface of a certain length of the conductive interconnect strip 120 melts and cools rapidly, that is, the surface of the fractured suspended portion 122 and part of the main body portion 121 is ablated, forming a undulating uneven structure 140.

[0054] The battery string 100 provided in this embodiment of the invention comprises multiple battery cells 110 arranged parallel to each other along a first direction, with a gap region 130 formed between adjacent battery cells 110. Multiple conductive interconnecting strips 120 are arranged at intervals along a second direction and extend along the first direction. Each conductive interconnecting strip 120 is simultaneously welded to multiple battery cells 110, wherein the first direction is perpendicular to the second direction. Each conductive interconnecting strip 120 has a laser-cutting area at a preset position within the gap region 130, and the width of the laser-cutting area is 0.2mm-0.8mm. Compared with the prior art, the battery string 100 provided by this invention, due to the use of conductive interconnecting strips 120 with laser-cutting areas at preset positions, can achieve rapid cutting of the conductive interconnecting strips, saving time and effort, shortening the cutting cycle, improving cutting efficiency, and facilitating control of the breakpoint spacing, enhancing the cutting effect, and improving cutting accuracy. This results in high power generation efficiency and a long service life for the photovoltaic module 10. Furthermore, the production method of the battery string 100 is simple, efficient, and produces high-quality products.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A battery string, characterized in that, It includes multiple battery cells and multiple conductive interconnect strips. The multiple battery cells are arranged parallel to each other along a first direction and a gap region is formed between two adjacent battery cells. The multiple conductive interconnect strips are arranged at intervals along a second direction and extend along the first direction. Each conductive interconnect strip is simultaneously welded to multiple battery cells. The first direction is perpendicular to the second direction. The conductive interconnect strip has a laser cutting area at a preset position, the preset position being located within the interval area, and the width of the laser cutting area is 0.2mm-0.8mm.

2. The battery string according to claim 1, characterized in that, The preset positions of two adjacent conductive interconnect strips are staggered and located in two different interval regions.

3. The battery string according to claim 1, characterized in that, The conductive interconnect strip includes a main body, a fractured suspended portion, and a connected suspended portion. There are multiple main bodies, at least one set of fractured suspended portions, and two fractured suspended portions in each set. There is at least one connected suspended portion. Each main body is welded to one of the battery cells. Each set of fractured suspended portions and each connected suspended portion are arranged in at least two interval regions in a one-to-one correspondence. The distance between the two fractured suspended portions in each set is 0.2mm-0.8mm.

4. The battery string according to claim 3, characterized in that, The distance between two of the fractured suspended portions in any group satisfies the following relationship: (L - L') / L' ≤ ±10%; In the formula, the average distance between two fractured suspended parts in multiple groups is L', and the distance between two fractured suspended parts in a certain group is L.

5. The battery string according to claim 3, characterized in that, The surfaces of the fractured suspended portion and part of the main body are provided with an uneven structure.

6. The battery string according to claim 5, characterized in that, The maximum height difference of the concave-convex structure is greater than 0.05 micrometers; And / or, the length of the uneven structure along the extension direction of the conductive interconnect strip is 0.5mm-1.5mm.

7. A photovoltaic module, characterized in that, Includes the battery string as described in any one of claims 1-6.

8. A method for producing a battery string, characterized in that, A method for producing a battery string as described in any one of claims 1-6, comprising: Multiple battery cells are welded together by means of multiple conductive interconnect strips that are arranged parallel to each other along a first direction. The multiple conductive interconnect strips are arranged at intervals along a second direction and extend along the first direction, wherein the first direction is perpendicular to the second direction. Each conductive interconnect strip is laser-cut at a preset position, wherein the preset position is located in the interval area formed between two adjacent battery cells, and the width of the laser-cut area is 0.2mm-0.8mm.

9. The method for producing a battery string according to claim 8, characterized in that, In the step of performing a one-time laser cut at a preset position of each of the conductive interconnect strips, the laser power is 1.5kW-8kW.

10. The method for producing a battery string according to claim 8, characterized in that, The conductive interconnecting strip includes a main body, a broken and suspended part, and a cut-off part connected in sequence. The main body is welded to the battery cell. The broken and suspended part and the cut-off part are both protruding from the edge of the battery cell. The cut-off part is located at the preset position. In the step of performing a one-time laser cut at a preset position of each of the conductive interconnect strips, the cut portion is eliminated by using a laser, and at the same time, the heat generated by the laser ablates the surface of the fractured suspended portion and part of the main body portion to form a concave-convex structure.

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