A battery string production method and a battery assembly production method
By alloying the solder ribbons of the gridless solar cells and applying adhesive for curing, the problem of unstable connection between the solder ribbons and grid lines was solved, which improved the stability and luminous efficiency of the photovoltaic modules and reduced costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WUXI AUTOWELL TECH
- Filing Date
- 2023-04-17
- Publication Date
- 2026-05-22
AI Technical Summary
The connection stability between the solder ribbon and grid line of existing photovoltaic cells is insufficient, resulting in optical loss and increased cost. At the same time, the poor temperature resistance and light transmittance of the transparent composite film affect the stability and luminous efficiency of the module.
The system employs gridless solar cells, which are connected to the sub-grid lines of the solar cells via solder ribbons. After soldering, adhesive is applied and cured to fix the solder ribbons and ensure connection stability. Four adhesive application and curing methods are provided to improve the stability and luminous efficiency of the solar module.
This achieves a stable connection between the solder ribbon and the solar cell, reduces optical shading, lowers costs, and improves the stability and luminous efficiency of the solar module.
Smart Images
Figure CN116314469B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of battery manufacturing, specifically a method for manufacturing battery strings and battery modules. Background Technology
[0002] Conventional photovoltaic solar modules use methods such as screen printing to deposit silver onto the surface of photovoltaic solar cells to create conductive grid lines. At designated locations, main grids and pads are printed to enhance mechanical strength and achieve good electrical contact.
[0003] However, during the process of forming a stable electrical connection between the solar cell's main busbar or pad and the solder ribbon through welding, the alignment between the solder ribbon and the main busbar requires a high degree of precision. Simultaneously, the silver paste creates some optical obstruction on the cell surface, causing optical losses in the photovoltaic cell. Furthermore, the extensive use of silver paste increases the cost of photovoltaic modules, which is detrimental to the development of solar photovoltaics.
[0004] Later, gridless solar cells were developed, where the solder ribbon is directly connected to the sub-busbars of the cell. To ensure the stability of the connection, an adhesive film is used to bond the solder ribbon and the cell together. This technology reduces the alignment requirements between the solder ribbon and the busbars, and the transparent composite film achieves a certain degree of mechanical bonding similar to that of soldering. However, the film has poor temperature resistance and light transmittance, which affects the stability and conductivity of the module, thus impacting its luminous efficiency. Summary of the Invention
[0005] To solve the above-mentioned technical problems, the present invention provides a method for producing battery strings, which adopts the following technical solution:
[0006] A method for producing battery strings, used to connect grid-less solar cells into battery strings, the method comprising:
[0007] The battery cells and welding strips are arranged onto the welding support device according to the predetermined stringing rules;
[0008] The solder ribbon is soldered onto the corresponding battery cell, so that an alloyed connection is formed between the solder ribbon and the sub-bus line on the corresponding battery cell, and a welded battery string is obtained.
[0009] Apply adhesive to the upper surface of the battery string from above, and / or apply adhesive to the lower surface of the battery string from below, and cure the adhesive on the upper and / or lower surfaces of the battery string so that the solder ribbons are then fixed to the corresponding battery cells.
[0010] The battery string production method of the present invention involves welding gridless solar cells into a battery string using solder ribbons, followed by applying adhesive and curing to the surface of the battery string with solder ribbons. This allows the solder ribbons to be fixed to the corresponding solar cells by the cured adhesive, thereby ensuring the connection stability between the solder ribbons and the sub-busbars and preventing shading of the solar cells, thus improving the stability and luminous efficiency of the battery module.
[0011] In some embodiments, applying adhesive to the upper surface of the battery string from above and applying adhesive to the lower surface of the battery string from below, and curing the adhesive on the upper and lower surfaces of the battery string, includes:
[0012] Apply adhesive to the upper and lower surfaces of the battery string simultaneously from both above and below; then simultaneously cure the adhesive on the upper and lower surfaces of the battery string; or,
[0013] Apply adhesive to the upper surface of the battery string from above and cure the adhesive. Then apply adhesive to the lower surface of the battery string from below and cure the adhesive. Alternatively,
[0014] Apply adhesive to the top surface of the battery string from above, then apply adhesive to the bottom surface from below, and then simultaneously cure the adhesive on both the top and bottom surfaces of the battery string; or,
[0015] Apply adhesive to the lower surface of the battery string from below, then apply adhesive to the upper surface of the battery string from above, and then simultaneously cure the adhesive on both the upper and lower surfaces of the battery string.
[0016] Four preferred methods for applying and curing adhesive are provided, all of which can complete the application and curing of adhesive to the upper and lower surfaces of the battery string. In the first embodiment, adhesive is applied to the upper and lower surfaces of the battery string simultaneously from both the top and bottom, and then the adhesive on the upper and lower surfaces of the battery string is cured simultaneously. This method can reduce the number of operation stations, shorten the equipment length, and improve work efficiency.
[0017] In some embodiments, the welding support device has a hollow area, and the welded battery string passes through the hollow area, exposing the lower surface of the battery string from the hollow area; applying adhesive to the lower surface of the battery string from below includes: applying adhesive to the lower surface of the battery string from below through the hollow area.
[0018] By providing a perforated area on the welding support device, the adhesive application device can apply adhesive to the lower surface of the battery string through the perforated area. This eliminates the need to flip the battery string, thus achieving adhesive application to the lower surface and preventing damage to the battery string.
[0019] In some embodiments, the welding support device includes a first welding conveying mechanism and a second welding conveying mechanism located downstream of the first welding conveying mechanism, wherein an adhesive application gap is formed between the discharge end of the first welding conveying mechanism and the inlet end of the second welding conveying mechanism; applying adhesive to the lower surface of the battery string from below includes: conveying the battery string toward the second welding mechanism using the first welding conveying mechanism; and applying adhesive to the lower surface of the battery string from below through the adhesive application gap during the transition of the battery string from the discharge end of the first welding conveying mechanism to the inlet end of the second welding mechanism.
[0020] The welding support device includes a first welding conveying mechanism and a second welding conveying mechanism located downstream of the first. A glue application gap is provided between the first and second welding conveying mechanisms, allowing the glue application device to apply glue to the lower surface of the battery string through this gap. This eliminates the need to flip the battery string, achieving glue application to the lower surface and preventing damage. It also avoids the first conveying mechanism transferring contaminants generated during the connection process, such as flux crystals, to the second conveying mechanism.
[0021] In some embodiments, the first welding conveying mechanism and the second welding conveying mechanism have the same conveying speed.
[0022] This allows the battery string to smoothly transition from the first welding conveyor to the second welding mechanism, ensuring that the adhesive application device applies stable adhesive to the lower surface of the battery string through the adhesive application gap.
[0023] In some embodiments, the battery string production method further includes lifting the battery string from the welding support to expose the lower surface of the battery string before applying adhesive to the lower surface of the battery string from below.
[0024] By lifting the battery string upwards, the adhesive applicator can apply adhesive to the lower surface of the battery string through the perforated area. This achieves adhesive application to the lower surface of the battery string without the need to flip it over, preventing damage to the battery string.
[0025] In some embodiments, welding the solder strip to the corresponding solar cell includes welding the solder strip to the corresponding solar cell using infrared, hot air, hot press or laser welding methods.
[0026] Several preferred welding methods are provided, all of which can ensure that the solder strips are welded to the corresponding solar cells, and all of the above welding methods can simultaneously weld the solder strips on the upper and lower surfaces of the solar cells.
[0027] In some embodiments, inkjet printing, screen printing, or dispensing methods are used to apply adhesive to the battery string.
[0028] Several preferred application methods are provided, all of which ensure that the adhesive is applied to the surface of the battery string with solder strips.
[0029] In some embodiments, adhesive application to the battery string can be done by intermittently applying dots of adhesive or by continuously applying strips of adhesive along the length of the solder strip.
[0030] Intermittent dispensing can reduce the amount of adhesive used and save costs while ensuring good adhesion between the solder ribbon and the battery cell. Continuous dispensing, on the other hand, can further improve the adhesion strength between the solder ribbon and the battery cell.
[0031] In some embodiments, the surface layer of the solder strip is a low-melting-point alloy or metal coating, and the melting point of the low-melting-point alloy or metal coating is 140°C to 200°C.
[0032] Gridless solar cells are not suitable for high-temperature welding. By using low-temperature welding strips with a low-melting-point alloy or metal coating, the welding strips can be welded to the welding surface at low temperatures.
[0033] The present invention also provides a method for producing battery modules, comprising:
[0034] Produce several battery strings according to any of the battery string production methods described above;
[0035] Arrange several battery strings into a battery module;
[0036] Weld busbars to the battery assembly;
[0037] Laminate and cure the battery assembly with welded busbars.
[0038] The battery module produced by the battery module manufacturing method provided by the present invention ensures the welding strength between the solder strips on the battery string and the sub-busbars, effectively preventing the solder strips from shifting, thereby ensuring the performance of the battery module and improving the stability and luminous efficiency of the battery module. Attached Figure Description
[0039] Figure 1 This is a schematic diagram of the execution flow of the battery string production method in an embodiment of the present invention;
[0040] Figure 2 This is a schematic diagram of the battery strings arranged in one embodiment of the present invention;
[0041] Figure 3 This is a schematic diagram of the battery string arranged in another embodiment of the present invention.
[0042] Figure 4 This is a schematic diagram of the structure of a battery string production device that performs the battery string production method of the present invention in one embodiment of the present invention;
[0043] Figure 5 This is a schematic diagram of the structure of a battery string production device that performs the battery string production method of the present invention in another embodiment of the present invention. Detailed Implementation
[0044] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0045] As described above, since there are no main grid lines on the gridless solar cell, the solder ribbon is directly connected to the sub-grid lines of the cell. To ensure the stability of the connection, the existing method is to use an adhesive film to bond the solder ribbon and the cell together. This technology reduces the alignment requirements between the solder ribbon and the grid lines, and the transparent composite film achieves a certain degree of mechanical performance connection similar to that of welding. However, the film has poor temperature resistance and light transmittance, which affects the stability of the module and its conductivity, thus affecting the stability and luminous efficiency of the module.
[0046] To address the aforementioned technical problems, this invention provides a method for producing battery strings, which is used to connect gridless solar cells into battery strings.
[0047] like Figure 1 As shown, the battery string production method provided by the present invention includes the following steps:
[0048] S1. Arrange the battery cells and welding strips onto the welding support device according to the predetermined stringing rules.
[0049] As is known to those skilled in the art, based on the arrangement of the welding surfaces, gridless solar cells are divided into two categories: the first type of solar cell has sub-grid lines on both its upper and lower surfaces, that is, welding strips are required on both the upper and lower surfaces; the second type of solar cell has sub-grid lines on only one surface, that is, welding strips are required on only the upper or lower surface.
[0050] The following section will provide a detailed description of step S1, which involves "arranging the battery cells and solder strips onto the welding support device according to a predetermined stringing rule" for the two types of battery cells mentioned above.
[0051] 1. For the first type of battery cell, that is, the situation where both the upper and lower surfaces of the battery cell need to be welded with solder strips.
[0052] like Figure 2 As shown, the pre-defined string arrangement rules are as follows:
[0053] The i-th cell is stacked on top of the rear half of the i-th ribbon group, and the front half of the (i+1)-th ribbon group is stacked on the i-th cell, where i is any integer greater than 0.
[0054] 2. For the second type of solar cell, which requires solder strips to be welded on only one surface, there are two situations:
[0055] Case 1: such as Figure 3 As shown, the pre-defined string arrangement rules are as follows:
[0056] First, N battery cells are laid on the welding support device, and the upper surface of the battery cells is the surface of the welding strip to be welded.
[0057] Next, N+1 solder ribbon groups are stacked on N battery cells. Specifically, the second half of the i-th solder ribbon group is stacked on the upper surface of the i-th battery cell, and the first half of the i-th solder ribbon group is stacked on the upper surface of the (i-1)-th battery cell. Here, i is any integer greater than 1 and less than N+1, and N is the total number of battery cells in the battery string.
[0058] The latter half of the first ribbon group (i.e., the head ribbon group) is stacked on the upper surface of the first cell, and the first half of the (N+1)th ribbon group (i.e., the tail ribbon group) is stacked on the upper surface of the Nth cell.
[0059] Scenario 2, the pre-arranged string arrangement rules are as follows:
[0060] First, lay N+1 welding strip groups onto the welding support device.
[0061] Then, N battery cells are stacked onto N+1 solder ribbon groups, with the lower surface of the battery cells being the surface of the solder ribbons to be welded. Specifically, the i-th battery cell is stacked on the latter half of the i-th solder ribbon group and the first half of the (i+1)-th solder ribbon group, where i is an integer from 1 to N.
[0062] S2. Weld the solder ribbon to the corresponding battery cell, so that the solder ribbon and the sub-grid line on the corresponding battery cell form an alloyed connection, and obtain the welded battery string.
[0063] Optionally, the solar cells can be welded using low-temperature welding strips, for example, the surface of the welding strip is a low-melting-point alloy or metal coating with a melting point of 140℃~200℃.
[0064] Infrared, hot air, hot pressure or laser welding methods, or a combination of several, can be used to heat the welding strip at low temperatures, so that the low melting point alloy or metal coating on the surface of the welding strip melts when heated, and finally forms an alloyed connection between the welding strip and each sub-grid line.
[0065] S3. Apply adhesive to the upper surface of the battery string from above, and / or apply adhesive to the lower surface of the battery string from below, and cure the adhesive on the upper and / or lower surfaces of the battery string so that the solder ribbon is then fixed to the corresponding battery cell.
[0066] As described above, based on the arrangement of the welding surfaces, the solar cells are divided into two categories: the first type of solar cell requires welding strips on both surfaces; the second type of solar cell requires welding strips on only the top surface.
[0067] The following section provides an exemplary description of the specific implementation process of step S3 for the two types of battery cells mentioned above.
[0068] 1. For the first type of battery cell, that is, the situation where both the upper and lower surfaces of the battery cell need to be welded with solder strips.
[0069] In this case, after the battery strings are welded together, it is necessary to apply adhesive and cure both the upper and lower surfaces of the battery strings.
[0070] Optionally, the upper and lower surfaces of the battery string can be coated and cured in the following four ways.
[0071] First implementation method:
[0072] First, adhesive is applied to the upper and lower surfaces of the battery string simultaneously from both above and below. Then, the adhesive on the upper and lower surfaces of the battery string is cured simultaneously.
[0073] This implementation method can reduce the number of operating stations, shorten the length of equipment, and improve production efficiency.
[0074] Second implementation method:
[0075] Apply adhesive to the top surface of the battery string from above, and then cure the adhesive on the top surface of the battery string. Next, apply adhesive to the bottom surface of the battery string from below, and then cure the adhesive on the bottom surface of the battery string.
[0076] That is, after the upper surface of the battery string is coated and cured, the lower surface of the battery string is coated and cured.
[0077] The third implementation method:
[0078] Apply adhesive to the upper surface of the battery string from above, then apply adhesive to the lower surface of the battery string from below, and then simultaneously cure the adhesive on both the upper and lower surfaces of the battery string.
[0079] Fourth implementation method:
[0080] Apply adhesive to the lower surface of the battery string from below, then apply adhesive to the upper surface of the battery string from above, and then simultaneously cure the adhesive on both the upper and lower surfaces of the battery string.
[0081] The following three examples will exemplarily describe the specific process of applying adhesive and curing to a battery string with solder strips welded to both the upper and lower surfaces:
[0082] First Embodiment
[0083] In this embodiment, the welding support device has a hollowed-out area. A stringing device is located above the welding support device in front of the hollowed-out area. As the laid-out battery cells and welding strips pass under the stringing device under the conveyor of the welding support device, the stringing device welds the welding strips to the corresponding battery cells, obtaining a welded battery string.
[0084] As the battery string passes through the perforated area, its lower surface is exposed. This allows the adhesive application device located below the perforated area to apply adhesive to the lower surface of the battery string from below.
[0085] To achieve the first embodiment described above, optionally, an upper adhesive application device is also provided above the hollowed-out area, and a curing device located above the welding support device is provided after the hollowed-out area. When the battery string passes through the hollowed-out area, the upper adhesive application device on the upper side of the hollowed-out area applies adhesive to the upper surface of the battery string from above, and the lower adhesive application device on the lower side of the hollowed-out area applies adhesive to the lower surface of the battery string from both above and below. When the battery string with adhesive applied to both the upper and lower surfaces passes under the curing device under the conveying of the welding support device, the curing device simultaneously cures the adhesive on the upper and lower surfaces of the battery string. In one implementation, the curing device is a thermosetting device. Of course, the curing device may also include an upper curing device located above the welding support device and a lower curing device located below the welding support device, and the upper curing device and the lower curing device can be either photocuring or thermosetting. The lower curing device can be set below the hollow area and after the lower adhesive application device, or it can be set inside the welding support device. The welding support device contains light-transmitting components, such as a light-transmitting belt. In this way, when the lower curing device is a light-curing device, the curing of the adhesive applied to the lower surface of the battery string can be completed through the light-transmitting belt.
[0086] To achieve the second embodiment described above, optionally, an upper adhesive application device and a first curing device are provided above the welding support device in the front stage of the hollowed-out area, and a second curing device is provided in the rear stage of the hollowed-out area. When the welded battery string passes under the upper adhesive application device, the upper adhesive application device applies adhesive to the upper surface of the battery string. When the battery string with the upper surface adhesive applied passes under the first curing device, the first curing device cures the adhesive on the upper surface of the battery string. When the battery string with the upper surface adhesive cured passes through the hollowed-out area, the lower adhesive application device applies adhesive to the lower surface of the battery string from below. The second curing device cures the battery string with the lower surface adhesive applied below the hollowed-out area. At this time, adhesive application and curing can be carried out simultaneously, improving curing efficiency. The second curing device can also be set inside the welding support device, which contains light-transmitting components, such as a light-transmitting belt. In this case, the second curing device is a light-curing device, and the curing of the adhesive applied to the lower surface of the battery string can be completed through the light-transmitting belt. Of course, when the second curing device is a thermosetting device, it can also be set above the welding support device. When the battery string with the lower surface adhesive applied passes under the second curing device, the second curing device cures the adhesive on the lower surface of the battery string.
[0087] To implement the third embodiment described above, optionally, an upper adhesive application device is provided above the welding support device in the front stage of the hollowed-out area, and a curing device is provided above the welding support device in the rear stage of the hollowed-out area. When the welded battery string passes under the upper adhesive application device, the upper adhesive application device applies adhesive to the upper surface of the battery string. When the battery string with the upper surface adhesive applied passes through the hollowed-out area, a lower adhesive application device applies adhesive to the lower surface of the battery string from below. When the battery string with the upper and lower surfaces adhesive applied passes under the curing device, the curing device simultaneously cures the adhesive on the upper and lower surfaces of the battery string. In one implementation, the curing device is a thermosetting device. Of course, the curing device may also include an upper curing device provided above the welding support device and a lower curing device provided below the welding support device, and the upper curing device and the lower curing device can be either photocuring or thermosetting. The lower curing device can be set below the hollow area and after the adhesive application device, or it can be set inside the welding support device. The welding support device contains light-transmitting components, such as a light-transmitting belt. In this way, when the lower curing device is photocuring, the adhesive application on the lower surface of the battery string can be cured through the light-transmitting belt.
[0088] To implement the fourth embodiment described above, optionally, an upper adhesive application device and a curing device are provided above the welding support device after the hollowed-out area. When the battery string passes through the hollowed-out area, the lower adhesive application device, located below the hollowed-out area, applies adhesive to the lower surface of the battery string from below. When the battery string with the lower surface adhesive applied passes under the upper adhesive application device, the upper adhesive application device applies adhesive to the upper surface of the battery string. When the battery string with both the upper and lower surfaces adhesive applied passes under the curing device, the curing device simultaneously cures the adhesive on the upper and lower surfaces of the battery string.
[0089] In one implementation, the curing device is a thermosetting device. Alternatively, the curing device can include an upper curing device positioned above the welding support device and a lower curing device positioned below the welding support device. Both the upper and lower curing devices can be either photocurable or thermosetting. The lower curing device can be positioned below the perforated area and after the lower adhesive application device, or it can be located within the welding support device. The welding support device may contain light-transmitting components, such as a light-transmitting belt, so that when the lower curing device is photocurable, the adhesive application to the lower surface of the battery string can be cured via the light-transmitting belt.
[0090] Second Embodiment
[0091] In this embodiment, as Figure 4 As shown, the welding support device 1 includes a first welding conveying mechanism 11 and a second welding conveying mechanism 12 located after the first welding conveying mechanism 11. A glue application gap 13 is formed between the discharge end of the first welding conveying mechanism 11 and the inlet end of the second welding conveying mechanism 12. A connecting device 2 is provided above the first welding conveying mechanism 11.
[0092] As the laid-out battery cells and welding ribbons are conveyed by the first welding conveyor 11 and pass under the stringing device 2, the stringing device 2 welds the welding ribbons onto the corresponding battery cells, obtaining a welded battery string. During the transition of the battery string from the discharge end of the first welding conveyor 11 to the inlet end of the second welding conveyor 12, the lower surface of the battery string is exposed through the adhesive application gap 13. Thus, the lower adhesive application device located below the adhesive application gap 13 can apply adhesive to the lower surface of the battery string from below.
[0093] Optionally, the first welding conveying mechanism 11 and the second welding conveying mechanism 12 have the same conveying speed. This allows the battery string to smoothly transition from the first welding conveying mechanism to the second welding mechanism, ensuring that the adhesive application device applies stable adhesive to the lower surface of the battery string through the adhesive application gap.
[0094] To achieve the first embodiment described above, optionally, an upper adhesive applicator is also provided on the upper side of the adhesive application gap 13, and a curing device 3 is provided above the second welding conveying mechanism 12. When the battery string passes through the adhesive application gap 13, the upper adhesive application device on the upper side of the adhesive application gap 13 applies adhesive to the upper surface of the battery string from above, and the lower adhesive application device on the lower side of the adhesive application gap 13 applies adhesive to the lower surface of the battery string from below. When the battery string with adhesive applied to both the upper and lower surfaces passes under the curing device 3 under the conveying of the second welding conveying mechanism 12, the curing device 3 simultaneously cures the adhesive on the upper and lower surfaces of the battery string. In one implementation, the curing device is a thermosetting device. Of course, the curing device may also include an upper curing device provided above the second welding support device and a lower curing device provided below the second welding support device, and the upper curing device and the lower curing device can be either photocuring or thermosetting. The lower curing device can be set below the hollow area and after the adhesive application device, or it can be set inside the welding support device. The second welding support device contains light-transmitting components, such as a light-transmitting belt. In this way, when the lower curing device is photocuring, the adhesive application on the lower surface of the battery string can be cured through the light-transmitting belt.
[0095] To implement the second embodiment described above, optionally, an upper adhesive application device and a first curing device are provided above the first welding conveying mechanism 11, located downstream of the stringing device 2, and a second curing device is provided above the second welding conveying mechanism 12. When the welded battery string passes under the upper adhesive application device, the upper adhesive application device applies adhesive to the upper surface of the battery string. When the battery string with the upper surface adhesive applied passes under the first curing device, the first curing device cures the adhesive on the upper surface of the battery string. When the battery string with the upper surface adhesive cured passes through the adhesive application gap, the lower adhesive application device applies adhesive to the lower surface of the battery string from below. When the battery string with the lower surface adhesive applied passes under the second curing device, the second curing device cures the adhesive on the lower surface of the battery string.
[0096] The second curing device can be either photocurable or thermocurable. It can be positioned below the perforated area and after the adhesive application device, or it can be located within a welding support device containing light-transmitting components, such as a light-transmitting belt. In this case, when the second curing device is photocurable, the adhesive application to the lower surface of the battery string can be cured via the light-transmitting belt.
[0097] To achieve the third embodiment described above, optionally, in one implementation, the curing device is a thermosetting device. An upper adhesive application device is positioned above the first welding conveying mechanism 11, located downstream of the stringing device 2, and a curing device is positioned above the second welding conveying mechanism 12. When the welded battery string passes under the upper adhesive application device, the upper adhesive application device applies adhesive to the upper surface of the battery string. When the battery string with the upper surface adhesive applied passes through the adhesive application gap, the lower adhesive application device applies adhesive to the lower surface of the battery string from below. When the battery string with both upper and lower surface adhesive applied passes under the curing device, the curing device simultaneously cures the adhesive on the upper and lower surfaces of the battery string.
[0098] Of course, the curing device may also include an upper curing device disposed above the first welding support device and a lower curing device disposed below the second welding support device, and the upper curing device and the lower curing device may be one of photocuring and thermocuring.
[0099] The lower curing device can be set below the hollow area and after the lower adhesive application device, or it can be set inside the second welding support device. The second welding support device contains light-transmitting components, such as a light-transmitting belt. In this way, when the lower curing device is photocuring, the adhesive application on the lower surface of the battery string can be cured through the light-transmitting belt.
[0100] To achieve the fourth embodiment described above, optionally, in one implementation, the curing device is a thermosetting device. An upper adhesive application device and a curing device are disposed above the second welding conveying mechanism 12. When the battery string passes through the adhesive application gap, the lower adhesive application device, located below the adhesive application gap, applies adhesive to the lower surface of the battery string from below. When the battery string with its lower surface adhesive applied passes below the upper adhesive application device, the upper adhesive application device applies adhesive to the upper surface of the battery string. When the battery string with both upper and lower surfaces adhesive applied passes below the curing device, the curing device simultaneously cures the adhesive on the upper and lower surfaces of the battery string.
[0101] Of course, the curing device may also include an upper curing device positioned above the second welding support device and a lower curing device positioned below the second welding support device. The upper and lower curing devices can be either photocurable or thermocurable. The lower curing device can be positioned below the hollowed-out area and after the lower adhesive application device, or it can be positioned inside the second welding support device. The second welding support device contains light-transmitting components, such as a light-transmitting belt. In this way, when the lower curing device is photocurable, the curing of the adhesive applied to the lower surface of the battery string can be completed through the light-transmitting belt.
[0102] Third Embodiment
[0103] In this embodiment, a conventional welding support device with conveying capabilities is used to transport the battery string. A battery string lifting device is positioned above the conveying path of the welding support device. Before applying adhesive to the lower surface of the battery string from below, the battery string is lifted from the welding support device by the battery string lifting device, thereby exposing the lower surface of the battery string. This allows the adhesive application device to apply adhesive to the lower surface of the battery string. The curing device then cures the battery string. The positions of the stringing device, curing device, and adhesive application device can be adapted to the four embodiments described above, and will not be elaborated further in this specification.
[0104] In all three embodiments described above, it is not necessary to flip the battery string to apply adhesive and cure the upper and lower surfaces of the battery string, thus preventing damage to the battery string during the flipping process.
[0105] 2. For the second type of solar cell, which requires solder strips to be welded on only one surface, there are two situations:
[0106] Situations where solder strips need to be welded to the upper surface:
[0107] That is, after the solar cells are laid on the welding support device, welding ribbons are stacked on their upper surface. After the welding ribbons are welded to the corresponding cells to form a battery string, adhesive needs to be applied to the upper surface of the battery string from above, and then the adhesive on the upper surface of the battery string needs to be cured so that the welding ribbons are then fixed to the corresponding solar cells.
[0108] like Figure 5 As shown, a standard welding support device 1 with conveying capabilities can meet the requirements for applying adhesive and curing the battery string. Specifically, an adhesive application mechanism 4 and a curing device 3 are sequentially arranged above the welding support device 1, located after the stringing device 2.
[0109] Driven by the welding support device 1, the laid-out battery cells and welding strips are conveyed by the welding support device 1 and pass under the stringing device 2. The stringing device 2 welds the welding strips to the corresponding battery cells to obtain the welded battery string.
[0110] Driven by the battery string welding support device 1, the battery string passes under the adhesive application mechanism 4 and the curing device 3 in sequence. The adhesive application mechanism 4 applies adhesive to the upper surface of the battery string, and the curing device 3 cures the adhesive on the upper surface of the battery string.
[0111] Situations where welding strips are required on the lower surface:
[0112] That is, after the solar cells are laid on the welding support device, the lower surface of the welding strip to be welded is pressed onto the welding strip. After the welding strip is welded to the corresponding cell to form a cell string, adhesive needs to be applied to the lower surface of the cell string from below, and then the adhesive on the lower surface of the cell string is cured to fix the welding strip to the corresponding solar cell.
[0113] To facilitate the application of adhesive to the lower surface of the battery string, the welding support device with a hollowed-out area as described in the previous embodiment, or the welding support device consisting of a first welding conveying mechanism and a second welding conveying mechanism with an adhesive application gap between them, can be used to transport the battery string.
[0114] The process includes a series connection device located above the welding support device in the front section of the hollow area or adhesive application gap, a curing device located above the welding support device in the rear section of the hollow area or adhesive application gap, and an adhesive application device located below the hollow area or adhesive application gap.
[0115] When the battery string passes through the hollow area or the glue application gap, the glue application mechanism applies glue to the lower surface of the battery string. After the glue application on the lower surface is completed, when the battery string passes under the curing device, the curing device cures the glue on the lower surface of the battery string.
[0116] Of course, the curing device can also be set after the adhesive application device in the hollow area, or set inside the welding support device. The welding support device contains light-transmitting components, such as a light-transmitting belt. In this way, when the curing device is a light-curing device, the curing of the adhesive applied to the lower surface of the battery string can be completed through the light-transmitting belt.
[0117] Optionally, in the embodiments described above, the adhesive application device may apply adhesive to the battery string using inkjet printing, screen printing, or dispensing methods.
[0118] The adhesive application device can apply adhesive to the battery string by intermittently applying dots of adhesive or continuously applying strips of adhesive along the length of the solder strip. The intermittent application method can reduce the amount of adhesive used and save costs while ensuring the adhesion between the solder strip and the battery cell, while the continuous application method can further improve the adhesion strength between the solder strip and the battery cell.
[0119] The present invention also provides a battery module manufacturing method, comprising: producing a plurality of battery strings according to the battery string manufacturing method provided in any of the above embodiments; arranging the plurality of battery strings into a battery module; welding busbars to the battery module; and laminating and curing the battery module with the welded busbars.
[0120] The battery module produced by the battery module manufacturing method provided by the present invention ensures the welding strength between the solder strips on the battery string and the sub-busbars, effectively preventing the solder strips from shifting, thereby ensuring the performance of the battery module and improving the stability and luminous efficiency of the battery module.
[0121] The present invention has been described above in sufficient detail and with certain specificities. Those skilled in the art should understand that the descriptions in the embodiments are merely exemplary, and all changes made without departing from the true spirit and scope of the invention should fall within the protection scope of the invention. The scope of protection claimed by the present invention is defined by the claims, and not by the above descriptions in the embodiments.
Claims
1. A method for producing battery strings, characterized in that, A method for connecting gridless solar cells into a battery string, the battery string production method comprising: The battery cells and welding strips are arranged on the welding support device according to the predetermined stringing rules. The surface of the welding strips is a low melting point alloy or metal coating. The solder ribbon is soldered onto the corresponding battery cell, so that an alloyed connection is formed between the solder ribbon and the sub-bus line on the corresponding battery cell, and a welded battery string is obtained. Apply adhesive to the upper surface of the battery string from above and / or apply adhesive to the lower surface of the battery string from below, and cure the adhesive on the upper and / or lower surfaces of the battery string so that the solder ribbons are then fixed to the corresponding battery cells.
2. The battery string production method as described in claim 1, characterized in that, The steps of applying adhesive to the upper surface of the battery string from above and applying adhesive to the lower surface of the battery string from below, and then curing the adhesive on the upper and lower surfaces of the battery string, include: Apply adhesive to the upper and lower surfaces of the battery string simultaneously from both above and below; then simultaneously cure the adhesive on the upper and lower surfaces of the battery string; or, Apply adhesive to the upper surface of the battery string from above, and cure the adhesive on the upper surface of the battery string; then apply adhesive to the lower surface of the battery string from below, and cure the adhesive on the lower surface of the battery string; or, Apply adhesive to the upper surface of the battery string from above, then apply adhesive to the lower surface of the battery string from below, and then simultaneously cure the adhesive on both the upper and lower surfaces of the battery string; or Apply adhesive to the lower surface of the battery string from below, then apply adhesive to the upper surface of the battery string from above, and then simultaneously cure the adhesive on the upper and lower surfaces of the battery string.
3. The battery string production method as described in claim 1, characterized in that, The welding support device has a hollow area, and the welded battery string passes through the hollow area, with the lower surface of the battery string exposed from the hollow area. The process of applying adhesive to the lower surface of the battery string from below includes: Apply adhesive to the lower surface of the battery string from below through the hollowed-out area.
4. The battery string production method as described in claim 1, characterized in that, The welding support device includes a first welding conveying mechanism and a second welding conveying mechanism located after the first welding conveying mechanism. A glue application gap is formed between the discharge end of the first welding conveying mechanism and the inlet end of the second welding conveying mechanism. The process of applying adhesive to the lower surface of the battery string from below includes: The battery string is conveyed toward the second welding mechanism using the first welding conveying mechanism; During the process of the battery string transitioning from the discharge end of the first welding conveying mechanism to the inlet end of the second welding mechanism, adhesive is applied to the lower surface of the battery string from below through the adhesive application gap.
5. The battery string production method as described in claim 4, characterized in that, The first welding conveying mechanism and the second welding conveying mechanism have the same conveying speed.
6. The battery string production method as described in claim 1, characterized in that, Before applying adhesive to the lower surface of the battery string from below, the battery string production method further includes lifting the battery string from the welding support device to expose the lower surface of the battery string.
7. The battery string production method as described in claim 1, characterized in that, The step of welding the welding strip to the corresponding battery cell includes welding the welding strip to the corresponding battery cell using infrared, hot air, hot pressure or laser welding methods.
8. The battery string production method as described in claim 1, characterized in that, Apply adhesive to the battery string using inkjet printing, screen printing, or dispensing methods.
9. The battery string production method as described in claim 1, characterized in that, The adhesive is applied to the battery string either intermittently in the form of dots or continuously in strips along the length of the solder strip.
10. The battery string production method as described in claim 1, characterized in that, The melting point of the low-melting-point alloy or metal coating is 140℃~200℃.
11. A method for producing a battery module, characterized in that, The battery module manufacturing method includes: A plurality of battery strings are produced according to the battery string production method according to any one of claims 1 to 10; Arrange several of the aforementioned battery strings into a battery assembly; Weld busbars to the battery assembly; The battery assembly with the aforementioned busbar welded on is subjected to lamination and curing.