Battery piece stringing method and stringing equipment thereof

Abstract

The invention provides a battery piece stringing method and stringing equipment thereof. The battery piece stringing method comprises the following steps: arranging a preset number of battery pieces at intervals along a battery piece stringing direction; a battery piece series connection piece is arranged on the top face of each battery piece so that the battery pieces can be connected in series to form a battery string, the battery piece series connection piece comprises welding strips and adhesive film strips corresponding to the welding strips in position in a one-to-one mode, and in the bonding process of the adhesive film strips and the top faces of the battery pieces, the space where the battery pieces are located is vacuumized. The probability that bubbles are formed between the adhesive film strip and the top face of the battery piece after the adhesive film strip and the top face of the battery piece are pasted can be effectively eradicated, the adhesive film strip and the top face of the battery piece are combined more tightly, the pasting reliability of the adhesive film strip and the battery piece is remarkably improved, the probability that the welding strip and the adhesive film strip are separated from the battery piece is reduced, and the battery string quality is improved.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic cell manufacturing technology, specifically to a method for stringing solar cells and a stringing device thereof. Background Technology

[0002] A photovoltaic (PV) module consists of PV panels made up of multiple cell strings connected together by busbars. Each cell string is made up of multiple solar cells connected together by solder ribbons. When laying solder ribbons on the solar cells, the ribbons need to be connected to the grid lines of the cells. Common methods for connecting solder ribbons to solar cells include welding, adhesive bonding, and encapsulant bonding. Because welding is costly and adhesive bonding has poor conductivity, encapsulant bonding is widely favored in the industry.

[0003] Existing adhesive film bonding methods are mainly divided into film strip bonding and film sheet bonding. Film sheet bonding uses a whole film to cover the solar cell, thereby positioning all the solder ribbons on the solar cell onto the solar cell. Film strip bonding, on the other hand, involves cutting the film into strips, and positioning each solder ribbon onto the solar cell using a separate film strip. Compared to film sheet bonding, film strip bonding saves more adhesive film, thus becoming a major research direction for bonding solder ribbons to solar cells.

[0004] In actual production, it was found that the reliability of the membrane strip connection method is lower than that of the welding and dispensing methods, and the membrane strip has a higher risk of falling off. There is an urgent need to improve the connection reliability between the membrane strip and the battery cell. Summary of the Invention

[0005] The battery cell stringing method and stringing equipment designed in this invention can overcome the shortcomings of the existing technology, which uses membrane strip connection to connect the welding strip and the battery cell, resulting in low connection reliability and a high risk of membrane strip detachment.

[0006] The purpose of this invention is to provide a method for preparing a battery string, comprising the following steps: A predetermined number of solar cells are arranged at intervals along the direction in which the solar cells are strung together. A battery cell connector is placed on the top surface of each battery cell to connect the battery cells to form a battery string. The battery cell connector includes a solder strip and an adhesive strip that corresponds to the position of each solder strip. During the bonding process between the adhesive strip and the top surface of the battery cell, the space in which the battery cell is located is evacuated to a vacuum state.

[0007] In some embodiments, the bonding process between the adhesive strip and the top surface of the battery cell includes: The placement stage where the adhesive strip moves close to the top surface of the battery cell and the bonding stage where the adhesive strip is placed on the top surface of the battery cell.

[0008] In some embodiments, placing the battery cell connector on the top surface of each battery cell to connect the battery cells in series to form a battery string specifically includes: First, place the solder ribbons on each battery cell, then place the adhesive film strips on top of the solder ribbons; or, Each adhesive strip is placed on each welding strip so that the adhesive strip adheres to each welding strip to form a film assembly.

[0009] In some embodiments, the solder strips are prepared by heating before the adhesive strips are bonded to each of the solder strips.

[0010] The present invention also provides a battery cell stringing device, comprising: A battery cell stringing platform, which is used to place a predetermined number of battery cells arranged at intervals along the battery cell stringing direction; A sealed housing with an accommodating space, in which the battery cell stringing platform is located, and the sealed housing has a top surface opening that can be sealed. A vacuum pump is used to evacuate the accommodating space.

[0011] In some embodiments, the cell stringing device further includes: A film-coated transporter is used to place the prepared solder ribbon and / or adhesive strip onto the top surface of each cell on the cell stringing platform, and when the vacuum pump operates to evacuate the accommodating space, the film-coated transporter can seal the opening on the top surface; and / or, The sealed housing includes a vertical wall surrounding the outer periphery of the battery cell stringing platform. The vertical wall has a high position state where the top end face is higher than the battery cell bearing plane of the battery cell stringing platform and a low position state where the top end face is lower than the battery cell bearing plane. The vertical wall can switch between the high position state and the low position state.

[0012] In some embodiments, the vertical wall includes a lower vertical wall and an upper vertical wall. An annular groove is formed on the top side end face of the lower vertical wall, and the upper vertical wall is inserted into the annular groove. The upper vertical wall can be controlled to rise and fall to switch the vertical wall between the high position and the low position. And / or, an inclined surface that gradually expands from bottom to top and outward is formed on the inner side wall of the top opening of the vertical wall. The membrane transporter has a connecting plate body, and the shape of the outer peripheral edge of the connecting plate body matches the inclined surface.

[0013] In some embodiments, the annular groove is provided with a plurality of elastic members arranged at intervals around the battery cells in a series platform, each elastic member being supported below the bottom end face of the upper vertical wall, and a telescopic drive member is provided between the upper vertical wall and the lower vertical wall.

[0014] The present invention also provides a battery cell stringing device, comprising: A battery cell stringing platform, which is used to place a predetermined number of battery cells arranged at intervals along the battery cell stringing direction; A film-solidifying device is disposed at the output end of the battery string of the battery cell stringing platform. The film-solidifying device includes a sealed housing, a vacuum pump, and a film-solidifying platform located within the accommodating space of the sealed housing. The sealed housing has a top opening that can be sealed. The film-solidifying platform can receive the battery strings output from the battery cell stringing platform. The vacuum pump is used to evacuate the accommodating space.

[0015] In some embodiments, the sealing housing includes a sealing cover for sealing the top surface opening, and the sealing cover has a film strip re-pressing roller on the side facing the film-fixing platform.

[0016] The battery cell stringing method and stringing equipment of the present invention, in the process of forming the battery cell-weld ribbon-adhesive strip structure, greatly reduces the air content in the space where the battery cell is located (i.e., the space where the battery cell, weld ribbon, and adhesive strip are located) by evacuating the space to a vacuum state. This effectively eliminates the probability of air bubbles forming between the adhesive strip and the top surface of the battery cell after they are pasted together, making the bond between the adhesive strip and the top surface of the battery cell tighter, significantly improving the bonding reliability, reducing the probability of the weld ribbon and adhesive strip detaching from the battery cell, and improving the quality of the battery string. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the steps of the battery cell stringing method according to an embodiment of the present invention; Figure 2 This is a schematic diagram (layout diagram) of a battery cell stringing device according to an embodiment of the present invention. Figure 3 This is a bottom view (structural schematic) of the membrane-carrying handy in an embodiment of the present invention. Figure 4 yes Figure 3 Side view; Figure 5 This is another structural schematic diagram of the battery cell stringing device according to an embodiment of the present invention; Figure 6 This is a structural schematic diagram (cross-section) of the sealed outer shell in an embodiment of the present invention. Figure 7 This is a schematic diagram (side view) of another structure of the membrane-carrying handy in an embodiment of the present invention. Figure 8 yes Figure 7 A three-dimensional structural diagram of the membrane-carrying handpiece in the image; Figure 9This is a schematic diagram of another three-dimensional structure of the sealing cap in an embodiment of the present invention.

[0018] In the diagram: 1. Battery cell stringing platform; 2. Film-coated transporter; 21. Connecting plate; 22. Film-coated transport structure; 3. Sealing shell; 31. Lower vertical wall; 311. Annular groove; 312. Elastic element; 32. Upper vertical wall; 33. Sealing strip; 34. Inclined surface; 4. Film-fixing platform; 5. Sealing cover; 51. Adhesive strip re-pressure roller; 6. Belt-making platform; 7. Film-making platform. Detailed Implementation

[0019] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of regions and layers is exaggerated. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0020] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of the invention. However, those skilled in the art will recognize that the invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.

[0021] The following example describes a method and apparatus for stringing battery cells according to the present invention. This example is only a part of the embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. All other embodiments obtained by those skilled in the art without inventive effort should be covered within the scope of protection of the present invention. Example 1:

[0022] Please refer to the reference. Figures 1 to 9 According to an embodiment of the present invention, a method for preparing a battery string is provided, comprising the following steps: A predetermined number of solar cells are arranged at intervals along the direction in which the solar cells are strung together. A battery cell connector is placed on the top surface of each battery cell to connect the battery cells into a battery string. The battery cell connector includes a solder strip and an adhesive strip corresponding to the position of each solder strip. During the bonding process between the adhesive strip and the top surface of the battery cell, the space in which the battery cell is located is evacuated to a vacuum state. Specifically, the bonding process between the adhesive strip and the top surface of the battery cell includes: a placement stage in which the adhesive strip moves close to the top surface of the battery cell and a bonding stage in which the adhesive strip is placed on the top surface of the battery cell. That is, the space in which the battery cell is located can be evacuated to a vacuum state as the adhesive strip is gradually lowered and approached by a corresponding handling mechanism (such as the film-carrying handling hand described later). This stage is the aforementioned placement stage. Alternatively, the space in which the battery cell is located can be evacuated to a vacuum state after the adhesive strip is placed and pasted on the top surface of the battery cell and becomes a whole with the battery cell. This is the aforementioned bonding stage. It is understandable that the aforementioned cell stringing components specifically include solder ribbons and corresponding adhesive strips for each solder ribbon. For BC type cell strings, there are two types of cell stringing components: one includes a positive electrode solder ribbon and an adhesive strip, and the other includes a negative electrode solder ribbon and an adhesive strip. It should be noted that during vacuuming, the specific vacuum level can be reasonably selected based on the actual adhesion effect between the adhesive strip and the cell.

[0023] In this technical solution, during the formation of the battery cell-welding ribbon-adhesive strip structure, the space where the battery cell is located (i.e., the space where the battery cell, welding ribbon, and adhesive strip are located) is evacuated to a vacuum state, which greatly reduces the air content in the aforementioned space. This effectively eliminates the probability of air bubbles forming between the adhesive strip and the top surface of the battery cell after they are pasted together, making the bond between the adhesive strip and the top surface of the battery cell tighter, significantly improving the bonding reliability of the two, reducing the probability of the welding ribbon and adhesive strip detaching from the battery cell, and improving the quality of the battery string.

[0024] In some embodiments, placing the battery cell connector on the top surface of each battery cell to connect the battery cells in series to form a battery string specifically includes: First, solder ribbons are placed on each battery cell, and then each adhesive strip is placed on top of the solder ribbons. That is, each solder ribbon and adhesive strip is placed on the top surface of the battery cell in sequence. Specifically, this can be achieved by using a separate solder ribbon transporter or adhesive strip transporter as described in the prior art.

[0025] Alternatively, in a more preferred embodiment, each adhesive strip is placed on each solder ribbon so that the adhesive strip adheres to each solder ribbon to form a film assembly. It is understood that the film assembly in this case is also the aforementioned cell connector.

[0026] In this technical solution, the welding strip and adhesive strip are bonded together in advance to form a film assembly. This eliminates the need for a corresponding handling hand for handling the welding strip, and only a corresponding handling hand is needed for handling the adhesive strip. This reduces structural configuration, simplifies structural design, and lowers design costs.

[0027] In some embodiments, before the adhesive strip is bonded to each of the solder ribbons, the solder ribbons are heated. When the heated solder ribbons come into contact with the adhesive strips, the adhesiveness of the adhesive strips is enhanced. This improves the reliability and stability of the solder ribbons and adhesive strips as a whole when they are transported and placed on the top surface of the battery cell, and prevents the solder ribbons from falling off during transport due to unreliable bonding. Example 2:

[0028] According to an embodiment of the present invention, see Figure 2 As shown, a battery cell stringing device is also provided, comprising: A battery cell stringing platform 1 is used to place a preset number of battery cells arranged at intervals along the stringing direction. The battery cell stringing platform 1 can be a stationary platform structure or a conveyor belt structure that can be driven to rotate and transport along the stringing direction. The appropriate choice can be made according to actual needs. The sealed housing 3 has an accommodating space, in which the battery cell stringing platform 1 is located. The sealed housing 3 has a top opening that can be sealed. Specifically, the sealed housing 3 can be a box structure with a top opening that can be opened and closed, and the size is slightly larger than the length and width of the aforementioned battery cell stringing platform 1. The height of the sealed housing 3 is at least higher than the height of the adhesive strip when the adhesive strip is placed on the top surface of the battery cell. A vacuum pump (not shown in the figure) is used to evacuate the accommodating space. Specifically, during application, when the top opening of the sealing shell 3 is sealed, the vacuum pump is controlled to operate to evacuate the accommodating space. After the adhesive strip is bonded to the top surface of the battery cell, the sealing shell 3 is connected to the external atmosphere. Specifically, a corresponding through hole is provided on the sealing shell 3, and an electromagnetic on / off valve that can control the opening and closing is provided on the through hole. When evacuating, the electromagnetic on / off valve is in the cut-off state, and when it is not necessary to maintain a vacuum state, the electromagnetic on / off valve is in the open state.

[0029] In this technical solution, the battery cell stringing platform 1 is set within the accommodating space of the sealed housing 3. During the process of attaching the adhesive strip to the top surface of the battery cell, the accommodating space is evacuated to a vacuum state by a vacuum pump, which greatly reduces the air content in the aforementioned space. This effectively eliminates the probability of air bubbles forming between the adhesive strip and the top surface of the battery cell after they are attached, making the bond between the adhesive strip and the top surface of the battery cell tighter. This significantly improves the bonding reliability of the two, reduces the probability of the solder ribbon and adhesive strip detaching from the battery cell, and improves the quality of the battery string.

[0030] In some embodiments, the top opening of the sealing housing 3 can be configured with a separate sealing cover 5. In specific applications, the battery cell connectors (including the welding strip and the adhesive strip) can be placed on the top surface of each battery cell on the battery cell stringing platform 1 first, and then the sealing housing 3 can be placed in place to seal the accommodating space. After that, the vacuum pump is controlled to operate to evacuate the accommodating space. At this time, the air between the adhesive strip and the bonding surface of the top surface of the battery cell will be extracted, thereby making the adhesion between the adhesive strip and the top surface of the battery cell tighter and more reliable.

[0031] In another preferred embodiment, the cell stringing device further includes a film-coated transporter 2, used to place the prepared solder ribbon and / or adhesive strip onto the top surface of each cell on the cell stringing platform 1. When the vacuum pump operates to evacuate the accommodating space, the film-coated transporter 2 can seal the top opening. That is, while transporting and transferring the solder ribbon and / or adhesive strip, the film-coated transporter 2 can simultaneously seal the top opening of the sealing shell 3. This simplifies the structure and allows for evacuation of the accommodating space directly upon the adhesive strip's descent and contact with the top surface of the cell. This ensures a vacuum state upon contact between the adhesive strip and the top surface of the cell, completely eliminating the formation of air bubble dead zones between the adhesive strip and the cell, and reducing the requirements for vacuuming. See details. Figure 3 and Figure 4 As shown, in a specific embodiment, the aforementioned film transporter 2 includes a connecting plate 21 connected to a drive arm (not shown in the figure). A vacuum suction hole, i.e., a film transport structure 22, is provided on the bottom end face of the connecting plate 21 to adsorb the adhesive strip. For the method of simultaneously bonding the adhesive strip to the welding ribbon in an adhesive manner, the structure of the film transporter 2 is very simple. Of course, in some other feasible embodiments, the aforementioned film transporter 2 can also be configured with a gripper structure that clamps the two ends of the welding ribbon.

[0032] The sealed housing 3 includes a vertical wall surrounding the outer periphery of the battery cell stringing platform 1. The vertical wall has a high position state where the top end face is higher than the battery cell bearing plane of the battery cell stringing platform 1 and a low position state where the top end face is lower than the battery cell bearing plane. The vertical wall can switch between the high position state and the low position state.

[0033] Specifically, when evacuating the containment space, the vertical wall can be switched to a high position. This facilitates the reliable formation of a sealed space and ensures a uniform vacuum at the top of the adhesive strip. When the containment space does not need to be vacuumed, the vertical wall can be switched to a low position. This facilitates operations such as transferring battery strings within the containment space. Especially when the battery cell stringing platform 1 is a rotary conveyor belt structure, the low position of the vertical wall ensures that the battery strings are smoothly transferred to the next station, such as the adhesive strip repressing station or the battery string cutting and segmenting station. For example, when the welding ribbon and adhesive strip are placed sequentially on the top surface of the battery cell, the vertical wall can be in a low position when placing the welding ribbon and in a high position when placing the adhesive strip.

[0034] In some implementation methods, see details. Figure 6 As shown, the vertical wall includes a lower vertical wall 31 and an upper vertical wall 32. An annular groove 311 is formed on the top side end face of the lower vertical wall 31. The upper vertical wall 32 is inserted into the annular groove 311, and the upper vertical wall 32 can be controlled to rise and fall to realize the switching of the vertical wall between the high position state and the low position state. In order to ensure the reliable and stable formation of the vacuum state, a sealing strip 33 is provided between the upper vertical wall 32 and the groove wall surface of the annular groove 311 to ensure the sealing of the annular groove 311 position when the upper vertical wall 32 is in the high position state.

[0035] In this technical solution, the lower vertical wall 31 and the upper vertical wall 32, which are capable of being raised and lowered to form a high-position state and a low-position state of the vertical wall, are used. At this time, the position of the lower vertical wall 31 remains unchanged, and only the upper vertical wall 32 is raised and lowered. This ensures that the lower part of the sealing shell 3 does not need to be moved, so that the lower part of the sealing shell 3 can be fixedly connected with the relevant structure of the battery cell stringing platform 1, reducing the sealing difficulty.

[0036] In some embodiments, the annular groove 311 is provided with a plurality of elastic elements 312 (e.g., helical springs) spaced around the battery cell string platform 1. Each elastic element 312 is supported below the bottom end face of the upper vertical wall 32. Preferably, the intervals between the elastic elements 312 are equal to form uniform elastic support for the bottom end face of the upper vertical wall 32. A telescopic drive (not shown in the figure) is provided between the upper vertical wall 32 and the lower vertical wall 31. In a specific embodiment, the aforementioned telescopic drive is a single-acting cylinder. Its cylinder body can be fixed to the outer wall surface of one of the lower vertical wall 31 and the upper vertical wall 32, while the working end of the piston rod is hinged to the outer wall surface of the other of the lower vertical wall 31 and the upper vertical wall 32.

[0037] In this technical solution, the telescopic rod (e.g., the piston rod) of the aforementioned telescopic drive can be controlled to retract to overcome the elastic force of the aforementioned elastic elements 312, causing the upper vertical wall 32 to descend to a low position. Alternatively, the telescopic element of the aforementioned telescopic drive can be controlled to extend, causing the upper vertical wall 32 to be in a high position. When the telescopic drive is a single-acting cylinder, the elastic force of the elastic element 312 drives the upper vertical wall 32 to switch from a low position to a high position. The structure is very simple, reducing design costs.

[0038] The inner wall surface of the top opening of the vertical wall (relative to the accommodating space) has a gradually expanding slope 34 from bottom to top. The shape of the outer peripheral edge of the connecting plate 21 of the film-coated transporter 2 matches the slope, that is, the outer peripheral edge of the connecting plate 21 has a chamfered structure. When the film-coated transporter 2 places the adhesive strip or film assembly on the top surface of the battery cell, the connecting plate 21 will form a wedge-shaped positioning with the aforementioned slope of the upper vertical wall 32 in the high position. This can prevent the film-coated transporter from exerting force and squeezing on the battery cell under the pressure difference between the vacuum below and the atmospheric pressure above, preventing damage to the battery cell. At the same time, it can also increase the mating area between the connecting plate 21 and the upper vertical wall 32, further improving the sealing effect at the mating position. In a preferred embodiment, an elastic sealing ring is provided on the outer peripheral wall surface of the connecting plate 21 (e.g., the aforementioned slope).

[0039] In a preferred embodiment, the battery cell stringing equipment further includes a strip forming platform 6 and a film forming platform 7. The strip forming platform 6 and the film forming platform 7 are respectively arranged on opposite sides of the battery cell stringing platform 1 to facilitate the handling and transfer of the welding strip and adhesive film strip by the conveying structure such as the film handling hand 2.

[0040] The strip-making platform 6 has a heating structure (not shown in the figure) capable of heating each strip. The aforementioned heating structure may be, for example, a conventional resistance wire or an electromagnetic heating component. Example 3:

[0041] According to embodiments of the present invention, such as Figure 5 As shown, a battery cell stringing device is also provided, comprising: A battery cell stringing platform 1 (which is the same as in Example 2) is used to place a predetermined number of battery cells arranged at intervals along the battery cell stringing direction. The film-forming device (not shown in the figure) is located at the output end of the battery string of the battery cell stringing platform 1 (i.e., Figure 5 (At the right end of the indicated orientation), a solid film station is formed, independent of the stringing station of the battery cell stringing platform 1. The solid film device includes a sealed housing 3, a vacuum pump (not shown in the figure), and a solid film platform 4 located in the accommodating space of the sealed housing 3. The sealed housing 3 has a top opening that can be sealed. The solid film platform 4 can receive the battery strings output by the battery cell stringing platform 1. The vacuum pump is used to evacuate the accommodating space. In a specific embodiment, the structure of the sealed housing 3 can be the same as that of the sealed housing 3 disclosed in Embodiment 2, which will not be repeated here. The structure of the aforementioned solid film platform 4 can be similar to or even the same as the structure of the aforementioned battery cell stringing platform 1.

[0042] In this technical solution, an independent film-fixing device is set on the downstream side of the cell stringing platform 1, i.e., the output end of the cell string. After placing cell connectors (i.e., solder ribbons and adhesive strips) on the top surface of each cell, the cell string is transported to the film-fixing platform 4, and the accommodating space inside the sealed housing 3 is further evacuated. Under the action of vacuum, the air between the adhesive strip and the bonding surface of the top surface of the cell is extracted, making the bonding between the adhesive strip and the top surface of the cell tighter, significantly improving the bonding reliability of the two, reducing the probability of the solder ribbon and adhesive strip detaching from the cell, and improving the quality of the cell string.

[0043] Corresponding to this embodiment, the sealing housing 3 includes a sealing cover 5, which is used to seal the top opening. That is, during vacuuming, the sealing cover 5 should be sealed to the top opening of the sealing housing 3. The difference is that the sealing cover 5 has a film strip re-pressing roller 51 on the side facing the film-fixing platform 4. This allows the film strips to be re-pressed by the film strip re-pressing roller 51 after vacuuming, further improving bonding reliability. See details. Figure 9 As shown, in a specific embodiment, the aforementioned adhesive strip repressing roller 51 is assembled on the transverse drive assembly. The transverse drive assembly is movably connected to the bottom end face of the sealing cover 5, thereby driving the adhesive strip repressing roller 51 to reciprocate linearly along the length direction of the battery string to repress each adhesive strip, further improving the connection reliability.

[0044] In a preferred embodiment, a sealing ring is also provided between the outer peripheral wall of the aforementioned sealing cover 5 and the sealing shell 3. In another preferred embodiment, the outer peripheral wall of the sealing cover 5 is also a chamfered structure that matches the inclined surface of the inner wall of the top opening of the sealing shell 3, so as to form a wedge-shaped positioning between the sealing cover 5 and the sealing shell 3 in height. This prevents the sealing cover 5 from exerting force and squeezing on the battery cell under the pressure difference between the vacuum below and the atmospheric pressure above, thus preventing damage to the battery cell. At the same time, it can also increase the mating area between the sealing cover 5 and the sealing shell 3 (e.g., the upper vertical wall 32 in embodiment 2), further improving the sealing effect at the mating position.

[0045] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0046] 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 method for preparing a battery string, characterized in that, Includes the following steps: A predetermined number of solar cells are arranged at intervals along the direction in which the solar cells are strung together. A battery cell connector is placed on the top surface of each battery cell to connect the battery cells to form a battery string. The battery cell connector includes a solder strip and an adhesive strip that corresponds to the position of each solder strip. During the bonding process between the adhesive strip and the top surface of the battery cell, the space in which the battery cell is located is evacuated to a vacuum state.

2. The battery string preparation method according to claim 1, characterized in that, The process of bonding the adhesive strip to the top surface of the battery cell includes: The placement stage where the adhesive strip moves close to the top surface of the battery cell and the bonding stage where the adhesive strip is placed on the top surface of the battery cell.

3. The battery string preparation method according to claim 1, characterized in that, Placing the battery cell connector on the top surface of each battery cell to connect the battery cells in series to form a battery string specifically includes: First, place the solder ribbons on each battery cell, then place the adhesive film strips on top of the solder ribbons; or, Each adhesive strip is placed on each welding strip so that the adhesive strip adheres to each welding strip to form a film assembly.

4. The battery string preparation method according to claim 3, characterized in that, Each solder strip is prepared by heating before the adhesive strip is bonded to each of the solder strips.

5. A battery cell stringing apparatus for performing the battery string preparation method according to any one of claims 1 to 4, characterized in that, include: A battery cell stringing platform (1) is used to place a predetermined number of battery cells arranged at intervals along the battery cell stringing direction. The sealed housing (3) has an accommodating space, in which the battery cell stringing platform (1) is located, and the sealed housing (3) has a top surface opening that can be sealed. A vacuum pump is used to evacuate the accommodating space.

6. The battery cell stringing device according to claim 5, characterized in that, Also includes: A film-coated transporter (2) is used to place the prepared solder ribbon and / or adhesive strip onto the top surface of each battery cell on the battery cell stringing platform (1), and when the vacuum pump operates to evacuate the accommodating space, the film-coated transporter (2) can seal the opening on the top surface; and / or, The sealed housing (3) includes a vertical wall surrounding the outer periphery of the battery cell stringing platform (1). The vertical wall has a high position state where the top end face is higher than the battery cell bearing plane of the battery cell stringing platform (1) and a low position state where the top end face is lower than the battery cell bearing plane. The vertical wall can switch between the high position state and the low position state.

7. The battery cell stringing device according to claim 6, characterized in that, The vertical wall includes a lower vertical wall (31) and an upper vertical wall (32). An annular groove (311) is formed on the top side end face of the lower vertical wall (31). The upper vertical wall (32) is inserted into the annular groove (311), and the upper vertical wall (32) can be controlled to rise and fall to realize the switching of the vertical wall between the high position state and the low position state; and / or, an inclined surface (34) that gradually expands from bottom to top and outward is formed on the inner side wall of the top opening of the vertical wall. The membrane transporter (2) has a connecting plate (21), and the shape of the outer peripheral edge of the connecting plate (21) matches the inclined surface (34).

8. The battery cell stringing device according to claim 7, characterized in that, The annular groove (311) is provided with a plurality of elastic elements (312) arranged at intervals around the battery cell stringing platform (1). Each elastic element (312) is supported below the bottom end face of the upper wall (32). A telescopic drive is provided between the upper wall (32) and the lower wall (31).

9. A battery cell stringing apparatus for performing the battery string preparation method according to any one of claims 1 to 4, characterized in that, include: A battery cell stringing platform (1) is used to place a predetermined number of battery cells arranged at intervals along the battery cell stringing direction. A solid film device is disposed at the battery string output end of the battery cell stringing platform (1). The solid film device includes a sealed housing (3), a vacuum pump, and a solid film platform (4) located in the accommodating space of the sealed housing (3). The sealed housing (3) has a top surface opening that can be sealed. The solid film platform (4) can receive the battery string output from the battery cell stringing platform (1). The vacuum pump is used to evacuate the accommodating space.

10. The battery cell stringing device according to claim 9, characterized in that, The sealing housing (3) includes a sealing cover (5) for sealing the top opening. The sealing cover (5) has a film strip pressing roller (51) on the side facing the film platform (4).

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