Battery string layout process and battery string layout piece

Abstract

The application relates to the technical field of photovoltaic modules, and particularly discloses a cell string layout process and a cell string layout piece, which comprises the following steps: fixing positive electrode welding strips and negative electrode welding strips on the surfaces of a plurality of cell pieces in the same cell string by using film strips, the film strips being provided with connecting gaps for placing bus bars; pasting insulating films at the connecting gaps corresponding to the negative electrode welding strips and / or pasting insulating films at the connecting gaps corresponding to the positive electrode welding strips; and placing the bus bars in the connecting gaps of adjacent two cell strings and fixing the bus bars on the cell pieces by welding or dispensing. By means of the above method, the welding strips are directly placed on the cell pieces, the cumulative error of positioning the bus bars with the welding strips is eliminated, the positioning precision of the welding strips and the main grid or the fine grid of the cell pieces is improved, the welding strips do not need to be previously mounted on the bus bars, the process steps are separately performed, and the universality and production rhythm of the equipment are improved.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic module technology, and in particular to a cell string layout process and cell string layout components. Background Technology

[0002] Currently, the industry primarily uses a stringer to produce individual cell strings for the fabrication of BC-type (back-contact) photovoltaic modules. These strings are then arranged by a layout machine to control the spacing between them to meet module design requirements. Next, busbars are welded to the cell strings, ensuring electrical contact between the busbars and the positive electrode solder strips on the cell string surface. Finally, the assembled cell strings with welded busbars are fed into a laminator for lamination to form the photovoltaic module. During this process, because the positive and negative electrodes of BC-type cells are located on the back side, the busbars must be precisely connected to the positive electrode solder strips on the cell string while strictly avoiding electrical contact with the negative electrode solder strips.

[0003] In the existing process, during the battery string arrangement stage, the solder strips, except for the two ends and the middle, are first pre-placed on the surface of the battery cells and fixed by welding. Then, the solder strips at the two ends and the middle are fixed to the busbars, and an insulating film is laid on the battery string. The busbars with the solder strips fixed are then placed on the insulating film to connect adjacent battery strings. Finally, the solder strips on the busbars are welded and fixed to the surface of the battery cells, thereby realizing the interconnection between battery strings.

[0004] In the above method, since the welding ribbon is first fixed to the busbar and then placed on the surface of the cell, the positioning accuracy of the welding ribbon and the fine grid lines or main grid lines on the surface of the cell is difficult to guarantee, which easily leads to misalignment, resulting in unstable welding quality, increased contact resistance, and even microcracks. In addition, since there are many specifications and models of photovoltaic cells, the position of the welding ribbon and the size of the busbar need to be adjusted for different specifications of cells. The above-mentioned process of "fixing the welding ribbon on the busbar first and then placing it on the cell string as a whole" has poor adaptability and seriously affects the production cycle and equipment versatility when changing production models.

[0005] Therefore, it is urgent to study a battery string layout process and battery string layout components to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a battery string layout process and battery string layout components to solve the problems of inaccurate solder strip positioning, cumbersome process, and poor adaptability in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A battery string arrangement process, comprising: S1. Use membrane strips to fix the positive electrode solder strips and negative electrode solder strips to the surface of several battery cells in the same battery string. The membrane strips have reserved connection gaps for placing the busbars. S2. Apply an insulating film to the connection gap corresponding to the negative electrode solder strip / or apply an insulating film to the connection gap corresponding to the positive electrode solder strip; S3. Place the busbar in the connection gap between two adjacent battery strings and fix it to the battery cell by welding or adhesive application.

[0008] As an optional technical solution for battery string arrangement process, in S1, there are several connection gaps. Some connection gaps are located at the ends of the battery string and form an end gap group, and some connection gaps are located in the middle of the battery string and form a middle gap group. The busbar includes end busbars and middle busbars. The end busbars are placed at the end gap group, and the middle busbars are placed at the middle gap group.

[0009] As an optional technical solution for battery string layout process, in S1, several ends of positive electrode solder strips that are not covered by film strips or ends of negative electrode solder strips that are not covered by film strips are used to form end gap groups at the ends of the battery string.

[0010] As an optional technical solution for battery string arrangement, in S3, adhesive is first applied to the connection gaps, and then the busbars are placed at the connection gaps; or, In S3, first place the busbar at the connection gap, and then apply adhesive to the side of the busbar.

[0011] As an optional technical solution for battery string layout process, the end busbars are first placed at the end gap group, and then the middle busbars are placed at the middle gap group. The end busbars and the middle busbars are staggered along the layout direction of the battery string.

[0012] As an optional technical solution for battery string arrangement, in S1, the membrane strips are sheet-like, and several membrane strips are arranged at intervals along the arrangement direction of multiple battery cells in the same battery string, with connecting gaps formed between adjacent membrane strips.

[0013] As an optional technical solution for battery string arrangement, along the arrangement direction of multiple battery cells in the same battery string, a partition gap is reserved on the film strip at the gap between adjacent battery cells.

[0014] As an optional technical solution for battery string layout process, in S1, the film strip is long and strip-shaped, and a film strip is attached to each positive electrode solder strip and each negative electrode solder strip in a one-to-one correspondence.

[0015] As an optional technical solution for battery string layout, the width of the connection gap reserved on the positive electrode solder strip is greater than or equal to the width of the connection gap reserved on the negative electrode solder strip, and is greater than the width of the busbar.

[0016] The battery string arrangement component, manufactured by the battery string arrangement process described in any of the above technical solutions, includes: A battery cell, wherein a plurality of said battery cells are arranged along a first direction to form a battery string; Positive electrode solder strips and negative electrode solder strips, wherein a plurality of the positive electrode solder strips are disposed on the battery cell and are arranged at intervals along a first direction; a plurality of the negative electrode solder strips are disposed on the battery cell and are arranged at intervals along the first direction; the positive electrode solder strips and the negative electrode solder strips are arranged alternately along a second direction perpendicular to the first direction; A membrane strip is attached to the positive electrode solder strip and the negative electrode solder strip, with a connection gap left; An insulating film is applied only to the connection gap on the negative electrode solder strip / or only to the connection gap on the positive electrode solder strip; Busbars extend along the second direction and are arranged in the connection gap, and are connected in series with the battery cells in adjacent battery strings.

[0017] The present invention has at least the following beneficial effects: This invention provides a battery string layout process and a battery string layout component. The battery string layout process includes the following steps: S1, using a film strip to fix the positive electrode solder strip and the negative electrode solder strip to the surface of several battery cells in the same battery string, with a connection gap reserved on the film strip for placing the busbar; S2, applying an insulating film to the connection gap corresponding to the negative electrode solder strip / or applying an insulating film to the connection gap corresponding to the positive electrode solder strip; S3, placing the busbar in the connection gap between two adjacent battery strings and fixing it to the battery cell by welding or adhesive application.

[0018] By using the above solution, the welding strip is placed directly on the battery cell, eliminating the cumulative error of positioning the busbar with the welding strip, and improving the positioning accuracy of the welding strip and the main grid or fine grid of the battery cell. The welding strip does not need to be installed on the busbar first, and each process step is carried out separately. When changing production, only the film strip, the reserved connection gap and the busbar size need to be adapted. There is no need to re-customize the connection of the welding strip and the busbar, simplifying the changeover process and improving the versatility of the equipment and the production cycle. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0020] Figure 1 This is a flowchart of the battery string arrangement process in an embodiment of the present invention; Figure 2This is a schematic diagram of the arrangement of two battery strings along the second direction in an embodiment of the present invention, where the membrane strip is long and narrow. Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the structure for placing the end busbar in an embodiment of the present invention; the membrane strip is elongated. Figure 5 This is a schematic diagram of the structure with the central busbar placed in an embodiment of the present invention. The membrane strip is long and narrow. Figure 6 This is a schematic diagram of the arrangement of two battery strings along the second direction in an embodiment of the present invention, where the membrane strip is sheet-like; Figure 7 This is a schematic diagram of the structure for placing the end busbar in an embodiment of the present invention; the membrane strip is sheet-shaped. Figure 8 This is a schematic diagram of the structure for placing the central busbar in an embodiment of the present invention. The membrane strip is sheet-shaped.

[0021] In the picture: 100. Membrane strip; 110. Connecting gap; 210. Positive electrode solder strip; 220. Negative electrode solder strip; 300, battery cells; 400. Insulating film; 510. End busbar; 520. Middle busbar. Detailed Implementation

[0022] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0023] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0024] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0025] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0026] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0027] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0028] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0029] like Figures 1 to 8 As shown, this embodiment provides a battery string layout process, which includes the following steps: S1. Use membrane strip 100 to fix the positive electrode solder strip 210 and the negative electrode solder strip 220 to the surface of several battery cells 300 in the same battery string. The membrane strip 100 has a connection gap 110 reserved for the placement of the busbar.

[0030] S2. Apply an insulating film 400 to the connection gap 110 corresponding to the negative electrode solder strip 220 / or apply an insulating film 400 to the connection gap 110 corresponding to the positive electrode solder strip 210.

[0031] S3. Place the busbar within the connection gap 110 between two adjacent battery strings and fix it to the surface of the battery cell 300 by welding or adhesive application.

[0032] Using the above solution, the positive electrode solder strip 210 and negative electrode solder strip 220 are directly placed on the battery cell 300, eliminating the cumulative error of positioning the busbar with the positive electrode solder strip 210 and negative electrode solder strip 220, and improving the positioning accuracy of the positive electrode solder strip 210, negative electrode solder strip 220 and the main grid or fine grid of the battery cell 300; the positive electrode solder strip 210 or negative electrode solder strip 220 does not need to be installed on the busbar first, and each process step is carried out separately; when changing production, only the membrane strip 100, the reserved connection gap 110 and the busbar size need to be adapted, without the need to re-customize the connection of the positive electrode solder strip 210, negative electrode solder strip 220 and the busbar, simplifying the changeover process and improving the versatility of the equipment and production cycle.

[0033] In some embodiments, in S1, there are several connection gaps 110. Some connection gaps 110 are located at the ends of the battery string, forming an end gap group, and some connection gaps 110 are located in the middle of the battery string, forming a middle gap group. The busbar includes an end busbar 510 and a middle busbar 520. The end busbar 510 is placed at the end gap group, and the middle busbar 520 is placed at the middle gap group. Through the above arrangement, the length of each busbar is shortened, the structure is simplified, the difficulty of processing and alignment is reduced, and the fitting accuracy between the busbar and the positive electrode welding strip 210 is improved.

[0034] In S1, several ends of the positive electrode solder strip 210 or the negative electrode solder strip 220 that are not covered by the membrane strip 100 are used to form end gap groups at the ends of the battery string. This arrangement helps to reduce the number of membrane strips 100 that need to be applied and improves the application efficiency.

[0035] In some embodiments, in step S3, adhesive is first applied to the connection gap 110, and then the busbar is placed at the connection gap 110. Applying adhesive first ensures sufficient adhesive at the connection gap 110, thereby increasing the bonding area between the busbar and the battery cell 300 and improving connection stability. The busbar has adhesive-receiving holes; in step S3, after placing the busbar, excess adhesive overflows upwards from the adhesive-receiving holes, preventing adhesive from overflowing from the side of the busbar and contaminating the battery cell 300. Additionally, a receiving groove is provided on the side of the busbar away from the battery cell 300, and the receiving groove is connected to the adhesive-receiving holes, allowing excess adhesive to flow into the receiving groove. Several receiving grooves are provided, evenly distributed around the periphery of the adhesive-receiving holes.

[0036] In other embodiments, in step S3, the busbar is first placed at the connection gap 110, and then adhesive is applied to the side of the busbar. This method helps ensure adhesive application accuracy and reduces adhesive usage. In some embodiments, the busbar is provided with an adhesive-receiving hole. In step S3, the busbar is first placed at the connection gap 110, and then adhesive is applied to the adhesive-receiving hole. The adhesive-receiving hole has a flared structure. Further, a receiving groove is provided on the side of the busbar facing the battery cell 300. The receiving groove communicates with the adhesive-receiving hole, allowing the adhesive to flow into the receiving groove after application, thereby increasing the bonding area between the busbar and the battery cell 300. Several receiving grooves are provided, and these grooves are evenly distributed around the periphery of the adhesive-receiving hole.

[0037] In some embodiments, the end busbar 510 is first placed at the end gap group, and then the middle busbar 520 is placed at the middle gap group, with the end busbar 510 and the middle busbar 520 being staggered along the battery string layout direction.

[0038] Combination Figures 2-5 As shown, in S1, the membrane strip 100 is elongated and is attached to each positive electrode solder strip 210 and each negative electrode solder strip 220 in a one-to-one correspondence along the arrangement direction of multiple battery cells 300 in the same battery string. This method effectively improves the attachment accuracy of the membrane strip 100 and reduces the amount of membrane strip 100 used. In this embodiment, the membrane strip 100 does not cover two solder strips in the second direction.

[0039] To ensure the ease of busbar placement, in some embodiments, the width of the connection gap 110 reserved on the positive electrode solder strip 210 is greater than or equal to the width of the connection gap 110 reserved on the negative electrode solder strip 220, and is greater than the width of the busbar.

[0040] In this design, the width of the connection gap 110 reserved on the negative electrode solder strip 220 is greater than the width of the busbar. This method ensures that after the insulating film 400 is applied, the busbar will not be excessively raised due to the increased thickness when it is placed, thus facilitating contact between the busbar and the positive electrode solder strip 210 and ensuring smooth series connection of the battery cells 300. It should be noted that if the width of the connection gap 110 reserved on the negative electrode solder strip 220 is less than the width of the busbar, and the distance between the busbar and the battery cell 300 is the sum of the thicknesses of the film strip 100 and the insulating film 400 when the insulating film 400 is applied and the busbar is placed, this is detrimental to the connection between the busbar and the positive electrode solder strip 210.

[0041] Combination Figures 6-8 As shown, in some embodiments, in S1, the membrane strip 100 is sheet-like, and several membrane strips 100 are arranged at intervals along the arrangement direction of multiple battery cells 300 in the same battery string, with connecting gaps 110 formed between adjacent membrane strips 100. The above method can reduce the number of times the membrane strip 100 is applied and improve the application efficiency. In this embodiment, a single membrane strip 100 covers all the positive electrode solder strips 210 and negative electrode solder strips 220 on the entire battery cell 300 in the second direction.

[0042] Specifically, within the same battery string, along the arrangement direction of multiple battery cells 300, a partition gap is reserved on the film strip 100 at the gaps between adjacent battery cells 300. This arrangement effectively reduces the area of ​​the film strip 100, lowers the possibility of wrinkles during the application process, and reduces the difficulty of application. In other embodiments, the film strip 100 covers all locations without connecting gaps 110 to shorten application time and improve production efficiency.

[0043] This embodiment also provides a battery string arrangement component, manufactured by the battery string arrangement process in any of the above embodiments, including battery cells 300, positive electrode solder ribbons 210, negative electrode solder ribbons 220, membrane strips 100, insulating film 400, and busbars. A plurality of battery cells 300 are arranged along a first direction to form a battery string; a plurality of positive electrode solder ribbons 210 are disposed on the battery cells 300 and spaced apart along the first direction; a plurality of negative electrode solder ribbons 220 are disposed on the battery cells 300 and spaced apart along the first direction. The positive electrode solder strips 210 and negative electrode solder strips 220 are arranged alternately along a second direction perpendicular to the first direction; the membrane strip 100 is attached to the positive electrode solder strips 210 and negative electrode solder strips 220, leaving a connection gap 110; the insulating film 400 is attached only to the connection gap 110 on the negative electrode solder strip 220 / or only to the connection gap 110 on the positive electrode solder strip 210; the busbar extends along the second direction and is arranged in the connection gap 110, and is connected in series with the battery cells 300 in the adjacent battery string.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery string arrangement process, characterized in that, include: S1. Use a membrane strip (100) to fix the positive electrode solder strip (210) and the negative electrode solder strip (220) to the surface of several battery cells (300) in the same battery string. The membrane strip (100) has a connection gap (110) reserved for the placement of the busbar. S2. Apply an insulating film (400) to the connection gap (110) corresponding to the negative electrode solder strip (220) / or apply an insulating film (400) to the connection gap (110) corresponding to the positive electrode solder strip (210). S3. Place the busbar in the connection gap (110) between two adjacent battery strings and fix it to the battery cell (300) by welding or glue application.

2. The battery string arrangement process according to claim 1, characterized in that, In S1, there are several connection gaps (110). Some connection gaps (110) are located at the ends of the battery string and form an end gap group. Some connection gaps (110) are located in the middle of the battery string and form a middle gap group. The busbar includes an end busbar (510) and a middle busbar (520). The end busbar (510) is placed at the end gap group, and the middle busbar (520) is placed at the middle gap group.

3. The battery string arrangement process according to claim 2, characterized in that, In S1, several ends of the positive electrode solder strip (210) or the negative electrode solder strip (220) of the uncovered membrane strip (100) are used to form an end gap group at the end of the battery string.

4. The battery string arrangement process according to claim 1, characterized in that, In S3, first apply adhesive to the connection gap (110), then place the manifold at the connection gap (110); or, In S3, the busbar is first placed at the connection gap (110), and then glue is applied to the side of the busbar.

5. The battery string arrangement process according to claim 4, characterized in that, First, place the end busbar (510) at the end gap group, and then place the middle busbar (520) at the middle gap group. The end busbar (510) and the middle busbar (520) are staggered along the layout direction of the battery string.

6. The battery string arrangement process according to claim 1, characterized in that, In S1, the membrane strip (100) is sheet-like, and several membrane strips (100) are arranged at intervals along the arrangement direction of multiple battery cells (300) in the same battery string, with connecting gaps (110) formed between adjacent membrane strips (100).

7. The battery string arrangement process according to claim 6, characterized in that, Along the arrangement direction of multiple battery cells (300) in the same battery string, a partition gap is reserved on the membrane strip (100) at the gap between adjacent battery cells (300).

8. The battery string arrangement process according to claim 1, characterized in that, In S1, the membrane strip (100) is long and strip-shaped, and a membrane strip (100) is attached to each positive electrode solder strip (210) and each negative electrode solder strip (220) in a one-to-one correspondence.

9. The battery string arrangement process according to claim 8, characterized in that, The width of the connection gap (110) reserved on the positive electrode solder strip (210) is greater than or equal to the width of the connection gap (110) reserved on the negative electrode solder strip (220), and is greater than the width of the busbar.

10. A battery string layout component, manufactured by the battery string layout process according to any one of claims 1-9, characterized in that, include: A battery cell (300), a plurality of said battery cells (300) are arranged along a first direction to form a battery string; Positive electrode solder strip (210) and negative electrode solder strip (220), a plurality of the positive electrode solder strips (210) are disposed on the battery cell (300) and are arranged at intervals along a first direction; a plurality of the negative electrode solder strips (220) are disposed on the battery cell (300) and are arranged at intervals along the first direction; along a second direction perpendicular to the first direction, the positive electrode solder strips (210) and the negative electrode solder strips (220) are arranged alternately; A membrane strip (100) is attached to the positive electrode solder strip (210) and the negative electrode solder strip (220), with a connection gap (110). An insulating film (400) is applied only to the connection gap (110) on the negative electrode solder strip (220) or only to the connection gap (110) on the positive electrode solder strip (210). Busbars extend along the second direction and are arranged in the connection gap (110), and are connected in series with the battery cells (300) in the adjacent battery strings.

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