Battery string forming equipment

Abstract

The utility model provides battery string forming equipment which comprises a first conveying mechanism, a string arranging mechanism and a first heating mechanism, and the string arranging mechanism is used for arranging battery pieces and welding strips on the first conveying mechanism. Thermosetting adhesive is arranged on the surface of the battery piece along the welding strip laying path, and the welding strip is arranged on the welding strip laying path on the surface of the battery piece. The first heating mechanism is arranged above the first conveying mechanism and comprises a first heating assembly, and a heating area of the first heating assembly forms a first welding curing area. The first conveying mechanism conveys the battery piece and the welding strip to the first welding curing area, and the heating temperature of the first welding curing area is higher than the melting point of the welding flux on the surface of the welding strip and higher than the curing temperature of the thermosetting adhesive. According to the invention, the battery pieces are welded while the battery pieces are glued into a string. And after the battery pieces are bunched, the welding quality of the battery strings can be detected, so that unqualified battery strings can be found as early as possible, and repair is convenient to implement.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cell module production, and specifically to a device for stringing battery strings. Background Art

[0002] For solar cells with thermosetting adhesive dots printed on their surfaces, the common stringing method is as follows: The welding tape is laid on the solar cell according to the stringing rules of the battery string, and the welding tape corresponds to the thermosetting adhesive dots on the surface of the solar cell. First, the thermosetting adhesive is cured by low-temperature heating to preliminarily bond the welding tape to the solar cell to form a battery string. Then, the battery string is typeset and the bus bar is welded. Finally, during the module lamination, the solder on the welding tape is melted by lamination heating so as to form an alloy connection between the welding tape and each grid line of the solar cell.

[0003] Since the welding between the welding tape and the solar cell is carried out in the lamination process, it is difficult to detect the welding quality of the battery string. In addition, even if a battery string with unqualified welding quality is detected, it is difficult to repair the battery string. Utility Model Content

[0004] In order to solve the above technical problems existing in the existing battery string stringing method, this application provides a device for stringing battery strings, which adopts the following technical solutions:

[0005] A device for stringing battery strings, which is used to string solar cells into battery strings. The device for stringing battery strings includes a first conveying mechanism, a stringing mechanism, and a first heating mechanism, wherein:

[0006] The stringing mechanism is used to arrange the solar cells and the welding tape on the first conveying mechanism according to a predetermined stringing rule, wherein: Thermosetting adhesives are arranged at intervals on the surface of the solar cell along the laying path of the welding tape, and the welding tape is placed on the laying path of the welding tape on the corresponding surface of the solar cell;

[0007] The first heating mechanism is arranged above the first conveying mechanism. The first heating mechanism includes a first heating component. The heating area of the first heating component forms a first welding and curing area. The first conveying mechanism is used to convey the laid solar cells and welding tape to the first welding and curing area. The heating temperature of the first welding and curing area is higher than the melting point of the solder on the surface of the welding tape and higher than the curing temperature of the thermosetting adhesive.

[0008] The battery stringing device provided by the present application is provided with a first heating mechanism above the first conveying mechanism. A first welding and curing area is formed on the first heating mechanism, and its heating temperature is not only higher than the curing temperature of the thermosetting adhesive, but also higher than the melting point of the solder on the surface of the solder tape. Therefore, when the battery cells with thermosetting adhesive points and the solder tape are conveyed to the first welding and curing area, the thermosetting adhesive points are cured while the solder is also melted. When the battery cells and the solder tape leave the first welding and curing area, the solder tape can not only achieve adhesion with the battery cells, but also achieve welding with the battery cells. In this way, after the battery cells are strung, the welding quality inspection of the battery string can be carried out, so as to facilitate the early detection of unqualified battery strings and the timely repair of unqualified battery strings.

[0009] In some embodiments, the heating temperature of the first welding and curing area is constant, and the first heating component includes at least one first infrared lamp group; alternatively, the heating temperature of the first welding and curing area is non-constant, and the first heating component includes at least two first infrared lamp groups arranged in sequence along the conveying direction of the first conveying mechanism, and each first infrared lamp group can be independently temperature-controlled.

[0010] Affected by the material and processing technology, some types of battery cells are more sensitive to the change of welding and curing temperature. Therefore, it is necessary to finely adjust the heating temperature of the first welding and curing area non-constantly according to the specific temperature resistance performance of the battery cells to avoid welding defects such as false soldering, over-soldering, and broken grids. The non-constant fine adjustment is, for example, to control the temperature to rise in a gradient, drop in a gradient, or first rise in a gradient and then drop in a gradient. While some types of battery cells are not sensitive to the change of welding and curing temperature. Therefore, in order to reduce the temperature control difficulty of the first welding and curing area and the structural complexity of the first heating component, the heating temperature of the first welding and curing area can be set to be constant.

[0011] The infrared lamp group has fast heat transfer and can quickly heat the battery cells, thereby shortening the time for solder melting and thermosetting adhesive curing and improving the stringing efficiency.

[0012] In some embodiments, the first heating mechanism further includes a second heating component located after the first heating component. The heating area of the second heating component forms a first heat preservation and curing area. The first conveying mechanism is used to sequentially convey the laid battery cells and solder tape to the first welding and curing area and the first heat preservation and curing area. The heating temperature of the first heat preservation and curing area is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder.

[0013] When the melting point of the solder is higher than the curing temperature of the thermosetting adhesive, if the curing time required for the thermosetting adhesive is relatively long, when the solar cell and the solder strip leave the first welding and curing zone, the thermosetting adhesive on the surface of the solar cell may not be fully cured. By arranging a second heating component after the first heating component, a first heat preservation and curing zone is formed after the first welding and curing zone. The solar cell and the solder strip enter the first heat preservation and curing zone after leaving the first welding and curing zone and are subjected to heat preservation and curing, so that the thermosetting adhesive on the surface of the solar cell continues to cure, and the solder on the solder strip begins to solidify, thereby improving the stringing efficiency.

[0014] In some embodiments, a first heating bottom plate is arranged below the conveying surface of the first conveying mechanism inside the first conveying mechanism; the first heating bottom plate includes a second welding and curing zone, and the heating temperature of the second welding and curing zone is at least higher than the curing temperature of the thermosetting adhesive; the starting end of the second welding and curing zone is the same as the starting end of the first welding and curing zone, and the length of the second welding and curing zone is shorter than, equal to or longer than the length of the first welding and curing zone; the heating temperature of the second welding and curing zone is constant temperature or non-constant temperature.

[0015] By arranging a first heating bottom plate below the conveying surface of the first conveying mechanism and forming a second welding and curing zone on the first heating bottom plate that is the same as the starting end of the first welding and curing zone, the second welding and curing zone is used to assist the first welding and curing zone to implement the welding and curing of the solar cell and the solder strip, thereby accelerating the melting of the solder and the curing of the thermosetting adhesive, shortening the welding and curing time, and improving the stringing efficiency of the solar cell. Among them, for the case where the melting point of the solder is higher than the curing temperature of the thermosetting adhesive, the heating temperature of the second welding and curing zone can be set to be higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder. At this time, the melting of the solder mainly depends on the heating of the first welding and curing zone. Of course, the heating temperature of the second welding and curing zone can also be set to be higher than the melting point of the solder, so as to further accelerate the melting of the solder. For the case where the melting point of the solder is lower than the curing temperature of the thermosetting adhesive, the heating temperature of the second welding and curing zone is set to be higher than the curing temperature of the thermosetting adhesive.

[0016] Since the melting of the solder and the curing of the thermosetting adhesive mainly depend on the heating of the first welding and curing zone, the length of the second welding and curing zone can be shorter than the length of the first curing zone. Such a setting will not have an adverse effect on the melting of the solder and the curing of the thermosetting adhesive. Of course, when the length of the second welding and curing zone is set to be equal to the length of the first curing zone, the second welding and curing zone can more fully assist the first welding and curing zone to implement heating, thereby further improving the stringing efficiency. And when the length of the second welding and curing zone is set to be longer than the length of the first curing zone, after the solar cell and the solder strip leave the first welding and curing zone, the thermosetting adhesive can continue to cure under the heating of the second welding and curing zone.

[0017] In some embodiments, the first heating base plate further includes a second heat preservation and curing area located after the second welding and curing area, and the heating temperature of the second heat preservation and curing area is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder.

[0018] For the case where the melting point of the solder is higher than the curing temperature of the thermosetting adhesive, if the curing time required for the thermosetting adhesive is relatively long, when the solar cell and the solder strip leave the first welding and curing area and the second welding and curing area, the thermosetting adhesive on the surface of the solar cell may not be completely cured. By forming a second heat preservation and curing area after the second welding and curing area, the solar cell and the solder strip enter the second heat preservation and curing area after leaving the first welding and curing area and the second welding and curing area, and are subjected to heat preservation and curing, so that the thermosetting adhesive on the surface of the solar cell continues to cure, and the solder on the solder strip begins to solidify, thereby improving the stringing efficiency.

[0019] In some embodiments, the first heating mechanism further includes a third heating component located before the first heating component, and the heating area of the third heating component forms a first buffer area, and the heating temperature of the first buffer area is higher than 30°C and lower than the melting point of the solder.

[0020] By setting a third heating component before the first heating component, a first buffer area located before the first welding and curing area is formed. Before the solar cell and the solder strip are subjected to welding and curing, they first pass through the first buffer area and are pre-heated in the first buffer area. In this way, the gradual heating of the solar cell is realized, and various defects caused by the rapid heating of the solar cell are avoided.

[0021] In some embodiments, the first buffer area includes a first preheating area and a first temperature rising area arranged in sequence. The temperature of the first preheating area is higher than 30°C and lower than 120°C, and the temperature of the first temperature rising area is higher than the temperature of the first preheating area and lower than the melting point of the solder.

[0022] In order to achieve a good welding effect, the solar cell needs to be gradually and slowly heated from room temperature to a temperature higher than the melting point of the solder. In this way, the stress of the solar cell can be reduced, and welding defects such as virtual soldering, over-soldering, and broken grids can be avoided.

[0023] In some embodiments, the first heating base plate further includes a second buffer area located before the second welding and curing area, and the heating temperature of the second buffer area is higher than 30°C and lower than the melting point of the solder; the starting point of the second buffer area coincides with the starting point of the first buffer area, or the starting point of the second buffer area is earlier than the starting point of the first buffer area.

[0024] A second buffer area that coincides with or is earlier than the starting point of the first buffer area is formed on the first heating base plate, so that the second buffer area and the first buffer area cooperate to pre-heat the solar cell and the solder strip, which is beneficial to ensuring the quality of the solar cell.

[0025] In some embodiments, the second buffer includes a second preheating zone and a second temperature-rising zone arranged in sequence. The temperature of the second preheating zone is higher than 30°C and lower than 120°C, and the temperature of the second temperature-rising zone is higher than that of the second preheating zone and lower than the melting point of the solder.

[0026] To achieve a good soldering effect, the solar cell needs to be gradually and slowly heated from room temperature to a temperature higher than the melting point of the solder. In this way, the stress on the solar cell can be reduced, and soldering defects such as false soldering, over-soldering, and broken grids can be avoided.

[0027] In some embodiments, the series connection device of the solar cell string further includes a cooling mechanism. The cooling mechanism is arranged above the first conveying mechanism and behind the first heating mechanism. The cooling mechanism is used to cool the solar cell and the solder strip. The cooling temperature of the cooling mechanism is lower than the melting point of the solder, so that the solder of the solder strip solidifies.

[0028] By arranging the cooling mechanism behind the first heating mechanism, the accelerated cooling of the solar cell and the solder strip after welding and curing is realized, so that the solder solidifies rapidly, and the temperature of the solar cell can also be reduced, reducing the soldering defects caused by long-term high temperature to the solar cell.

[0029] To avoid the solder being heated and melted again after being cooled and solidified, in the case where the first heating bottom plate is arranged in the first conveying mechanism, the cooling mechanism can be arranged behind the first welding and curing area and the second welding and curing area. In this way, after the solar cell and the solder strip leave the first welding and curing area and the second welding and curing area, they are cooled by the cooling mechanism. Of course, in the case where the first heating bottom plate is not arranged in the first conveying mechanism, the cooling mechanism can be arranged behind the first welding and curing area. In this way, after the solar cell and the solder strip leave the first welding and curing area, they are cooled by the cooling mechanism.

[0030] In some embodiments, the stringing mechanism includes a solar cell placing part, a solder strip placing part, and a tooling removing part, where: the solar cell placing part is used to place the solar cells on the first conveying mechanism according to a predetermined stringing rule, the solder strip laying part is used to place the solder strips on the first conveying mechanism according to a predetermined stringing rule, and the solar cell placing part is further used to place the pressing tooling on the solar cells with solder strips placed on the first conveying mechanism to press the solder strips onto the solar cells; the tooling removing part is located behind the first heating mechanism and is used to remove the pressing tooling from the solar cells after the solder of the solder strip solidifies.

[0031] Through the cooperation of the cell placement part and the solder tape placement part, the stringing mechanism realizes the automatic laying and stacking of cells and solder tapes into strings, and automatically places the pressing tooling on the cells with solder tapes laid, ensuring that the solder tapes are pressed tightly on the cells, preventing the solder tapes from shifting in position, and ensuring that the solder tapes are accurately welded to the target positions. By arranging a tooling removal part after the first heating mechanism, after the solder of the solder tape solidifies, the pressing tooling can be automatically removed from the cells.

[0032] In some embodiments, the cell stringing device further includes a flux coating mechanism, which is used to coat flux on the solder tape before the stringing mechanism lays the solder tape.

[0033] By arranging the flux coating mechanism, flux can be automatically coated on the solder tape before the stringing mechanism lays the solder tape, and the flux can improve the welding quality between the solder tape and the cells.

[0034] In some embodiments, the cell stringing device further includes a string splitting mechanism and a second conveying mechanism. Among them, the second conveying mechanism is located after the first conveying mechanism, and the string splitting mechanism is arranged between the input end of the second conveying mechanism and the output end of the first conveying mechanism. The string splitting mechanism is used to split the overall cell string into multiple independent segmented cell strings.

[0035] By arranging the second conveying mechanism after the first conveying mechanism and arranging the string splitting mechanism between the first conveying mechanism and the second conveying mechanism, the splitting process of the overall cell string is realized to obtain individual cell strings with a predetermined length.

[0036] In some embodiments, a second heating bottom plate located below the conveying surface of the second conveying mechanism is arranged in the second conveying mechanism. The second heating bottom plate forms a third heat preservation and curing area, and the heating temperature of the third heat preservation and curing area is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder.

[0037] By arranging the second heating bottom plate to form a third heat preservation and curing area on the second heating bottom plate, when the cell string passes through the third heat preservation and curing area, the incompletely cured thermosetting adhesive on the cell surface can continue to cure, the curing time of the thermosetting adhesive can be extended, and it is applicable to thermosetting adhesives that require long-time curing.

[0038] In some embodiments, the cell stringing device further includes a second heating mechanism arranged after the tooling removal part. The second heating mechanism is located above at least one of the first conveying mechanism and the second conveying mechanism; the second heating mechanism includes a fourth heating component, and the heating area of the fourth heating component forms a fourth heat preservation and curing area, and the heating temperature of the fourth heat preservation and curing area is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder.

[0039] For the case where the melting point of the solder is higher than the curing temperature of the thermosetting adhesive, by forming a fourth heat preservation and curing zone after the tooling removal section, after the pressing tooling is removed from the battery cell, the battery cell and the solder strip immediately enter the fourth heat preservation and curing zone. The setting of the fourth heat preservation and curing zone can prevent the battery cell from cooling, so that the incompletely cured thermosetting adhesive on the surface of the battery cell can continue to cure.

[0040] In some embodiments, the thermosetting adhesive includes at least one of epoxy resin adhesive, phenolic resin adhesive, polyurethane adhesive, acrylic adhesive, and silicone adhesive.

[0041] Several thermosetting adhesives with good bonding effect and capable of rapid curing are provided.

[0042] In some embodiments, the solder on the surface of the solder strip is at least one of tin-lead alloy, tin-lead-bismuth alloy, tin-lead-indium alloy, tin-bismuth-silver alloy, and tin-bismuth-copper alloy.

[0043] Several solders capable of firmly welding the solder strip to the battery cell are provided, and after the solder solidifies, a metallized connection with good conductive effect can be generated between the solder strip and the battery cell.

[0044] In some embodiments, the battery cell is a main-gridless battery cell, the thermosetting adhesive is located between two adjacent sub-grid lines of the battery cell, the solder strip is placed on the solder strip laying path on the corresponding battery cell surface, and is perpendicular to and intersects each sub-grid line on the corresponding battery cell surface; or, the battery cell is a main-grid battery cell, and the thermosetting adhesive is arranged at intervals on the main grid line of the battery cell.

[0045] For the main-gridless battery cell, by applying the thermosetting adhesive between two adjacent sub-grid lines of the battery cell, after the solder strip is bonded to the battery cell through the thermosetting adhesive, the solder strip makes conductive contact with each sub-grid line on the solder strip laying path. For the main-grid battery cell, by arranging the thermosetting adhesive at intervals on the main grid line of the battery cell, after the solder strip is bonded to the battery cell through the thermosetting adhesive, the solder strip can make conductive contact with the corresponding main grid line. Brief Description of the Drawings

[0046] Figure 1 It is a top view structural schematic diagram of the battery string forming device according to the first embodiment of the present application;

[0047] Figure 2 It is a side view structural schematic diagram of the battery string forming device according to the first embodiment of the present application;

[0048] Figure 3 It is a first layout schematic diagram of the heating zone of the first heating mechanism and the first heating bottom plate in the first embodiment of the present application;

[0049] Figure 4Schematic diagram of the second layout of the first heating mechanism and the heating area of the first heating bottom plate in the first embodiment of the present application;

[0050] Figure 5 Schematic diagram of the third layout of the first heating mechanism and the heating area of the first heating bottom plate in the first embodiment of the present application;

[0051] Figure 6 Schematic diagram of the fourth layout of the first heating mechanism and the heating area of the first heating bottom plate in the first embodiment of the present application;

[0052] Figure 7 Schematic diagram of the fifth layout of the first heating mechanism and the heating area of the first heating bottom plate in the first embodiment of the present application;

[0053] Figure 8 Top view structural diagram of the battery stringing device in the second embodiment of the present application;

[0054] Figure 9 Side view structural diagram of the battery stringing device in the second embodiment of the present application;

[0055] Figure 10 Schematic diagram of the first layout of the first heating mechanism and the heating area of the first heating bottom plate in the second embodiment of the present application;

[0056] Figure 11 Schematic diagram of the second layout of the first heating mechanism and the heating area of the first heating bottom plate in the second embodiment of the present application;

[0057] Figure 12 Schematic diagram of the main-gridless battery cell in the embodiment of the present application;

[0058] Figure 13 is Figure 12 Partial enlarged view of area A in;

[0059] Figure 14 Execution flow of the battery stringing method in the first embodiment of the present application;

[0060] Figure 15 Execution flow of the battery stringing method in the second embodiment of the present application:

[0061] Figure 16 Execution flow of the battery stringing method in the third embodiment of the present application:

[0062] Figure 17 Execution flow of the battery stringing method in the fourth embodiment of the present application.

[0063] Figures 1 to 17 includes:

[0064] The first conveying mechanism 1: the first heating bottom plate 11;

[0065] The stringing mechanism 2: the cell placing part 21, the welding tape placing part 22, the tooling removing part 23;

[0066] The first heating mechanism 3;

[0067] The cooling mechanism 4;

[0068] The flux coating mechanism 5;

[0069] The string dividing mechanism 6;

[0070] The second conveying mechanism 7: the second heating bottom plate 71;

[0071] The second heating mechanism 8;

[0072] The main-gridless cell 100, the sub-grid line 101, the thermosetting glue 200, the welding tape 300;

[0073] The first welding and curing area A, the second welding and curing area B, the first heat preservation and curing area C, the second heat preservation and curing area D, the first buffer area E, the second buffer area F. Specific embodiments

[0074] To make the above objects, features and advantages of the present application more obvious and understandable, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0075] As Figures 1 to 2 shown, the cell stringing device provided by the present application includes a first conveying mechanism 1, a stringing mechanism 2 and a first heating mechanism 3.

[0076] The stringing mechanism 2 is used to arrange the cells and the welding tapes on the first conveying mechanism 1 according to a predetermined stringing rule, wherein: thermosetting glue is arranged at intervals on the surface of the cell along the welding tape laying path, and the welding tape is laid on the welding tape laying path on the surface of the corresponding cell.

[0077] The first heating mechanism 3 is arranged above the first conveying mechanism 1. The first heating mechanism 3 includes a first heating component, and the heating area of the first heating component forms a first welding and curing area. The first conveying mechanism 1 is used to convey the laid cells and welding tapes to the first welding and curing area. The heating temperature of the first welding and curing area is higher than the melting point of the solder on the surface of the welding tape and higher than the curing temperature of the thermosetting glue.

[0078] The battery stringing device provided by the present application is provided with a first heating mechanism 3 above the first conveying mechanism 1. A first welding and curing area is formed on the first heating mechanism 3. The heating temperature of the first welding and curing area is not only higher than the curing temperature of the thermosetting adhesive, but also higher than the melting point of the solder on the surface of the solder tape. Therefore, when the battery cells with thermosetting adhesive points and the solder tape are conveyed to the first welding and curing area, the thermosetting adhesive points are cured while the solder is melted. When the battery cells and the solder tape leave the first welding and curing area, the solder tape can not only be adhesively bonded to the battery cells, but also be welded to the battery cells.

[0079] In this way, after the battery cells are strung, the welding quality inspection of the battery string can be carried out, so as to facilitate the early detection of the battery strings with unqualified welding and also facilitate the timely repair of the unqualified battery strings.

[0080] As Figure 12 and Figure 13 shown, the battery cell 100 can be a main-gridless battery cell. The thermosetting adhesive 200 is located between two adjacent sub-grid lines 101 of the battery cell 100. The solder tape 300 is placed on the solder tape laying path on the surface of the corresponding battery cell 100 and is perpendicular to and intersects each sub-grid line 101 on the surface of the corresponding battery cell 100. After the solder tape 300 is adhesively bonded to the battery cell 100 through the thermosetting adhesive 200, it makes conductive contact with each sub-grid line 101 on the corresponding battery cell 100.

[0081] Of course, the battery cell can also be a main-grid battery cell. The thermosetting adhesive is arranged at intervals on the main grid line of the battery cell. The solder tape is placed on the main grid line. After the solder tape is adhesively bonded to the battery cell through the thermosetting adhesive, it makes conductive contact with the corresponding main grid line.

[0082] The thermosetting adhesive provided on the surface of the battery cell can be selected from at least one of epoxy resin adhesives, phenolic resin adhesives, polyurethane adhesives, acrylic adhesives, and silicone adhesives. The curing temperature of these thermosetting adhesives is a certain specific temperature in the range of 100°C to 250°C.

[0083] The solder on the surface of the solder tape can be selected from at least one of tin-lead alloys, tin-lead-bismuth alloys, tin-lead-indium alloys, tin-bismuth-silver alloys, and tin-bismuth-copper alloys. The melting point of these solders is a certain specific temperature in the range of 130°C to 250°C.

[0084] The heating temperature of the first welding and curing area is selected and set to a certain specific temperature value or temperature range in the range of 130°C to 300°C, and is higher than the curing temperature of the thermosetting adhesive and the melting point of the solder.

[0085] In a specific embodiment, the melting point of the solder may be higher than the curing temperature of the hot melt adhesive or may be lower than the curing temperature of the hot melt adhesive. In the following, for the above two different situations, the specific structure and working process of the battery stringing device in the embodiments of the present application will be described in more detail.

[0086] Case 1: The melting point of the solder is higher than the curing temperature of the hot melt adhesive.

[0087] For example, the melting point of the solder on the surface of the solder strip is 170°C, and the curing temperature of the thermosetting adhesive provided on the surface of the battery cell is 120°C. The heating temperature of the first welding and curing area needs to be set higher than 170°C.

[0088] As is known to those skilled in the art, affected by the material and processing technology, the sensitivity of the battery cell to temperature changes varies. In some embodiments, the battery cell is more sensitive to changes in the heating temperature. Therefore, it is necessary to finely adjust the heating temperature of the first welding and curing area non-constantly according to the specific temperature resistance performance of the battery cell to avoid welding defects such as virtual soldering, over-soldering, and broken grids.

[0089] Still taking the melting point of the solder used as 170°C and the curing temperature of the thermosetting adhesive used as 120°C as an example for illustration. For example, in one embodiment, the heating temperature in the first welding and curing area is set to increase gradiently along the conveying direction of the first conveying mechanism 1. For example, the first welding and curing area is sequentially divided into three consecutive heating areas along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the three heating areas are 180°C, 200°C, and 220°C respectively. The lengths of the three heating areas can be set to be the same or different according to specific needs.

[0090] In another embodiment, the heating temperature of the first welding and curing area is set to decrease gradiently along the conveying direction of the first conveying mechanism 1. For example, the first welding and curing area is sequentially divided into four consecutive heating areas along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the four heating areas are 220°C, 210°C, 200°C, and 190°C respectively. The lengths of the four heating areas can be set to be the same or different according to specific needs.

[0091] In yet another embodiment, the heating temperature of the first welding and curing area is set to increase gradiently first and then decrease gradiently along the conveying direction of the first conveying mechanism 1. For example, the first welding and curing area is sequentially divided into five consecutive heating areas along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the five heating areas are 180°C, 190°C, 200°C, 190°C, and 180°C respectively. Similarly, the lengths of the five heating areas can be set to be the same or different according to specific needs.

[0092] In other embodiments, the heating temperature of the first welding and curing area can also be set according to other change rules to meet different welding and curing requirements.

[0093] To form a non-constant-temperature first welding and curing zone, the first heating assembly includes at least two first infrared lamp groups arranged in sequence along the conveying direction of the first conveying mechanism 1, and each first infrared lamp group can be independently temperature-controlled, so that each first infrared lamp group forms a corresponding heating zone with a different temperature.

[0094] For example, in the case where the first welding and curing zone in the foregoing text is sequentially divided into three consecutive heating zones along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the three heating zones are 180°C, 200°C, and 220°C respectively, correspondingly, the first heating assembly includes three first infrared lamp groups arranged in sequence along the conveying direction of the first conveying mechanism 1, and the three first infrared lamp groups sequentially form three consecutive heating zones with heating temperatures of 180°C, 200°C, and 220°C respectively.

[0095] Each first heating assembly can be composed of multiple lamp tubes or multiple lamp beads. The infrared lamp group has fast heat transfer and can quickly heat the battery chip, thereby shortening the time for solder melting and thermosetting adhesive curing and improving the stringing efficiency.

[0096] In some other embodiments, the battery chip is not sensitive to changes in the heating temperature. Therefore, in order to reduce the difficulty of temperature control of the first welding and curing zone and the structural complexity of the first heating assembly, the heating temperature of the first welding and curing zone can be set to a constant temperature. For example, the heating temperature of the first welding and curing zone is set to a constant 220°C.

[0097] To form a constant-temperature first welding and curing zone, the first heating assembly may only include one first infrared lamp group, and this first infrared lamp group forms a constant-temperature first welding and curing zone. Of course, the first heating assembly may also include two or more first infrared lamp groups, and the two or more first infrared lamp groups jointly form a constant-temperature first welding and curing zone.

[0098] Similarly, each first heating assembly can be composed of multiple lamp tubes or multiple lamp beads.

[0099] Since the curing time required for some types of thermosetting adhesives is relatively long, in order to take into account the production efficiency of the battery string, when the battery chip and the welding tape leave the first welding and curing zone, the thermosetting adhesive may not be completely cured.

[0100] For this reason, optionally, the first heating mechanism 3 further includes a second heating assembly located after the first heating assembly. As Figure 6 and Figure 7 shown, the heating zone of the second heating assembly forms a first heat preservation and curing zone C. The first conveying mechanism 1 is used to sequentially convey the laid battery chip and welding tape to the first welding and curing zone A and the first heat preservation and curing zone C. The heating temperature of the first heat preservation and curing zone C is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder.

[0101] Still taking the melting point of the solder used as 170°C and the curing temperature of the thermosetting adhesive used as 120°C as an example, the heating temperature of the first heat preservation and curing zone is set to be higher than 120°C and lower than 170°C.

[0102] After the battery cell and the solder strip leave the first welding and curing zone A, they enter the first heat preservation and curing zone C. The first heat preservation and curing zone C continues to heat the battery cell and the welding. Since the temperature of the first heat preservation and curing zone C is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder, therefore, the thermosetting adhesive on the surface of the battery cell continues to cure, and the solder on the solder strip begins to solidify, gradually forming a metallized connection between the solder strip and the battery cell.

[0103] The heating temperature of the first heat preservation and curing zone C can be designed to be constant temperature, that is, the heating temperature at each part of the first heat preservation and curing zone C is the same temperature, such as 140°C. The second heating component can include only one second infrared lamp group, and this second infrared lamp group forms the first heat preservation and curing zone C with constant temperature. Of course, the second heating component can also include more than two second infrared lamp groups, and more than two second infrared lamp groups jointly form the second heat preservation and curing zone C with constant temperature. The second heating component can be composed of multiple lamp tubes or multiple lamp beads.

[0104] The heating temperature of the first heat preservation and curing zone C can also be set to non-constant temperature. For example, the heating temperature of the first heat preservation and curing zone C is set to decrease in a gradient along the conveying direction of the first conveying mechanism 1. In this case, the second heating component includes at least two second infrared lamp groups arranged in sequence along the conveying direction of the first conveying mechanism 1. For example, the first heat preservation and curing zone C is sequentially divided into three consecutive heating zones along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the three heating zones are 160°C, 150°C, and 140°C respectively. Correspondingly, the second heating component includes three second infrared lamp groups arranged in sequence along the conveying direction of the first conveying mechanism 1, and the three second infrared lamp groups sequentially form three heating zones with heating temperatures of 160°C, 150°C, and 140°C respectively. The second heating component can be composed of multiple lamp tubes or multiple lamp beads.

[0105] As Figures 1 to 2 shown, optionally, a first heating bottom plate 11 is arranged below the conveying surface of the first conveying mechanism 1 inside the first conveying mechanism 1. As Figures 3 to 7 shown, the first heating bottom plate 11 includes a second welding and curing zone B, and the heating temperature of the second welding and curing zone B is at least higher than the curing temperature of the thermosetting adhesive. The starting end of the second welding and curing zone B is the same as the starting end of the first welding and curing zone A.

[0106] By arranging a first heating bottom plate 11 below the conveying surface of the first conveying mechanism 1 and forming a second welding and curing area B on the first heating bottom plate 11, which is the same as the starting end of the first welding and curing area A, the second welding and curing area B is used to assist the first welding and curing area A in implementing the welding and curing of the battery cell and the solder strip, thereby accelerating the melting of the solder and the curing of the thermosetting adhesive, shortening the welding and curing time, and improving the efficiency of stringing the battery cells.

[0107] The heating temperature of the second welding and curing area B can be set to be higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder. At this time, the melting of the solder mainly depends on the heating of the first welding and curing area A. Of course, the heating temperature of the second welding and curing area B can also be set to be higher than the melting point of the solder, so as to further accelerate the melting of the solder.

[0108] As Figure 3 and Figure 6 shown, optionally, the length of the second welding and curing area B is equal to the length of the first welding and curing area A. With this setting, the second welding and curing area B can more fully assist the first welding and curing area A in implementing heating, thereby further improving the stringing efficiency.

[0109] As Figure 4 shown, optionally, the length of the second welding and curing area B is shorter than the length of the first welding and curing area A. The melting of the solder and the curing of the thermosetting adhesive mainly depend on the heating of the first welding and curing area A. Therefore, with this setting, it will not have an adverse effect on the melting of the solder and the curing of the thermosetting adhesive.

[0110] As Figure 5 and Figure 7 shown, optionally, the length of the second welding and curing area B is longer than the length of the first welding and curing area A. With this setting, after the battery cell and the solder strip leave the first welding and curing area, the thermosetting adhesive can continue to cure under the heating of the second welding and curing area.

[0111] Still taking the melting point of the solder used as 170 °C and the curing temperature of the thermosetting adhesive used as 120 °C as an example. Optionally, the heating temperature of the second welding and curing area B is set to be constant temperature, that is, the heating temperature at each part of the second welding and curing area B is the same temperature, such as 200 °C. Optionally, the first heating bottom plate 11 corresponding to the position of the second welding and curing area B can be a separate heating bottom plate, which generates a constant-temperature second welding and curing area B through heating.

[0112] The heating temperature of the second welding and curing area B can also be set to be non-constant temperature. For example, in one embodiment, the heating temperature in the second welding and curing area B is set to increase gradually along the conveying direction of the first conveying mechanism 1. For example, the second welding and curing area B is sequentially divided into three consecutive heating areas along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the three heating areas are 180 °C, 190 °C, and 200 °C respectively.

[0113] In another embodiment, the heating temperature in the second welding and curing zone B is set to decrease in a gradient along the conveying direction of the first conveying mechanism 1. For example, the second welding and curing zone B is sequentially divided into four consecutive heating zones along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the four heating zones are 200 °C, 190 °C, 180 °C, and 170 °C respectively.

[0114] To form the non-constant temperature second welding and curing zone B, optionally, the first heating bottom plate 11 corresponding to the second welding and curing zone B is composed of a plurality of independently temperature-controlled heating bottom plates.

[0115] Since the curing time required for some types of thermosetting adhesives is relatively long, in order to take into account the production efficiency of the battery string, after the battery cells and the solder tapes leave the first welding and curing zone A and the second welding and curing zone B, the thermosetting adhesive on the battery cells may not be completely cured.

[0116] As Figures 3 to 7 shown, optionally, the first heating bottom plate 11 further includes a second heat preservation and curing zone D located after the second welding and curing zone B, and the heating temperature of the second heat preservation and curing zone D is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder.

[0117] Still taking the melting point of the solder used as 170 °C and the curing temperature of the thermosetting adhesive used as 120 °C as an example, the heating temperature of the second heat preservation and curing zone D is set to be higher than 120 °C and lower than 170 °C.

[0118] After the battery cells and the solder tapes leave the first welding and curing zone A and the second welding and curing zone B, they enter the second heat preservation and curing zone D, so that the thermosetting adhesive on the surface of the battery cells continues to cure, and the solder on the solder tapes begins to solidify, gradually forming a metallized connection between the solder tapes and the battery cells.

[0119] For the case where the first heat preservation and curing zone C is also provided, the second heat preservation and curing zone D cooperates with the first heat preservation and curing zone C to jointly implement the heat preservation and curing of the battery cells and the solder tapes, thereby shortening the time of heat preservation and curing.

[0120] The heating temperature of the second heat preservation and curing zone D can be set to be constant temperature, that is, the heating temperature at each place in the second heat preservation and curing zone D is the same temperature, such as 140 °C. Optionally, the first heating bottom plate 11 corresponding to the position of the second heat preservation and curing zone D can be a separate heating bottom plate, which generates a constant temperature second welding and curing zone D through heating.

[0121] The heating temperature of the second heat preservation and curing zone D can also be set to decrease in a gradient. For example, the second heat preservation and curing zone D is sequentially divided into four consecutive heating zones along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the four heating zones are 160 °C, 150 °C, 140 °C, and 130 °C respectively.

[0122] To form a second heat preservation and curing zone D with a gradient decline, optionally, the first heating bottom plate 11 corresponding to the second heat preservation and curing zone D is composed of a plurality of independently temperature-controlled heating bottom plates.

[0123] Optionally, the first heating mechanism 3 further includes a third heating component located in front of the first heating component. As Figures 3 to 7 shown, the heating zone of the third heating component forms a first buffer zone E, and the heating temperature of the first buffer zone E is higher than 30°C and lower than the melting point of the solder. Still taking the melting point of the solder used as 170°C as an example, the heating temperature of the first buffer zone E is set to be higher than 30°C and lower than 170°C.

[0124] By forming a first buffer zone E in front of the first welding and curing zone A, the battery cell and the welding tape pass through the first buffer zone E in advance and are pre-heated in the first buffer zone before entering the first welding and curing zone A. In this way, the gradual heating of the battery cell is realized, and various defects caused by the sharp temperature rise of the battery cell are avoided.

[0125] To achieve a good welding effect, the battery cell needs to be gradually and slowly heated from room temperature to a temperature higher than the melting point of the solder. In this way, the stress of the battery cell can be reduced, and welding defects such as virtual soldering, over-soldering, and broken grid can be avoided.

[0126] For this reason, optionally, the first buffer zone E includes a first preheating zone and a first temperature rising zone arranged in sequence, wherein the temperature of the first preheating zone is higher than 30°C and lower than 120°C, and the temperature of the first temperature rising zone is higher than the temperature of the first preheating zone and lower than the melting point of the solder.

[0127] Still taking the melting point of the solder used as 170°C as an example, the temperature of the first preheating zone can be set to a constant temperature, such as 100°C. The temperature of the first preheating zone may also be set to rise in a gradient. For example, the first preheating zone is sequentially divided into three consecutive heating zones along the conveying direction of the first conveying mechanism 1, and the temperatures of the three heating zones are 50°C, 70°C, and 90°C respectively. Similarly, the first temperature rising zone can be set to a constant temperature, such as 140°C. The temperature of the first temperature rising zone may also be set to rise in a gradient. For example, the first temperature rising zone is sequentially divided into four consecutive heating zones along the conveying direction of the first conveying mechanism 1, and the temperatures of the four heating zones are 110°C, 120°C, 130°C, and 140°C respectively.

[0128] For the case where the first heating bottom plate 11 is arranged below the conveying surface of the first conveying mechanism 1. As Figures 3 to 7As shown, optionally, the first heating base plate 11 further includes a second buffer zone F in front of the second soldering and curing zone B. The heating temperature of the second buffer zone F is higher than 30°C and lower than the melting point of the solder. The starting point of the second buffer zone F coincides with the starting point of the first buffer zone E, or the starting point of the second buffer zone F is earlier than the starting point of the first buffer zone E.

[0129] By forming a second buffer zone F on the first heating base plate 11 that coincides with or is earlier than the starting point of the first buffer zone E, the second buffer zone F and the first buffer zone E cooperate to preheat the battery cell and the solder tape in advance, which is beneficial to ensuring the quality of the battery cell.

[0130] Similarly, in order to achieve good soldering effects, the battery cell needs to be gradually and slowly heated from room temperature to a temperature higher than the melting point of the solder. In this way, the stress of the battery cell can be reduced, and soldering defects such as false soldering, over-soldering, and broken grids can be avoided. Optionally, the second buffer zone F includes a second preheating zone and a second temperature rising zone arranged in sequence along the conveying direction of the conveying mechanism 1. Among them, the temperature of the second preheating zone is higher than 30°C and lower than 120°C, and the temperature of the second temperature rising zone is higher than the temperature of the second preheating zone and lower than the melting point of the solder.

[0131] Still taking the melting point of the adopted solder as 170°C as an example, the temperature of the second preheating zone can be set to a constant temperature, such as 80°C. The temperature of the second preheating zone may also be set to rise in a gradient. For example, the second preheating zone is sequentially divided into three consecutive heating zones along the conveying direction of the second conveying mechanism 1, and the temperatures of the three heating zones are 40°C, 60°C, and 80°C respectively. Similarly, the second temperature rising zone can be set to a constant temperature, such as 120°C. The temperature of the second temperature rising zone may also be set to rise in a gradient. For example, the second temperature rising zone is sequentially divided into four consecutive heating zones along the conveying direction of the first conveying mechanism 1, and the temperatures of the four heating zones are 100°C, 110°C, 120°C, and 130°C respectively.

[0132] As Figures 1 to 2 As shown, optionally, the battery stringing device in the embodiment of the present application further includes a cooling mechanism 4. The cooling mechanism 4 is arranged above the first conveying mechanism 1 and behind the first heating mechanism 3. The cooling mechanism 4 is used to cool the battery cell and the solder tape. The cooling temperature of the cooling mechanism 4 is lower than the melting point of the solder to solidify the solder of the solder tape. The cooling mechanism 4 can adopt an air cooling device.

[0133] By arranging the cooling mechanism 4 behind the first heating mechanism 3, rapid cooling of the battery cell and the solder tape after soldering and curing is achieved, so that the solder solidifies faster. In addition, the cooling mechanism 4 also realizes rapid cooling of the battery cell, reducing soldering defects caused by long-term high temperature to the battery cell.

[0134] To avoid the solder being reheated and melted after being cooled and solidified, asFigures 3 to 7 As shown in the figure, for the case where the first heating base plate 11 is provided in the first conveying mechanism 1, the cooling mechanism 4 can be arranged after the first welding and curing area A and the second welding and curing area B. In this way, the solar cell and the welding tape are cooled by the cooling mechanism 4 only after leaving the first welding and curing area A and the second welding and curing area B.

[0135] Of course, for the case where the first heating base plate 11 is not provided in the first conveying mechanism 1, the cooling mechanism 4 can be arranged after the first welding and curing area A. In this way, the solar cell and the welding tape are cooled by the cooling mechanism 4 after leaving the first welding and curing area A.

[0136] As Figure 1 and Figure 2 shown, optionally, the stringing mechanism 2 includes a solar cell placing part 21, a welding tape placing part 22 and a tooling removing part 23, where: the solar cell placing part 21 is used to place solar cells on the first conveying mechanism 1 according to a predetermined stringing rule, the welding tape laying part 22 is used to place welding tapes on the first conveying mechanism 1 according to a predetermined stringing rule, and the solar cell placing part 21 is further used to place a pressing tooling on the solar cells with welding tapes placed on the first conveying mechanism 1 to press the welding tapes on the solar cells. The tooling removing part 23 is located after the first heating mechanism 3 and is used to remove the pressing tooling from the solar cells after the solder of the welding tape solidifies.

[0137] Through the cooperation of the solar cell placing part 21 and the welding tape placing part 22, the stringing mechanism 2 realizes the automatic laying and stacking of solar cells and welding tapes into strings, and automatically places the pressing tooling on the solar cells with welding tapes placed thereon, so as to press the welding tapes on the solar cells, prevent the welding tapes from shifting in position during the conveying process, and ensure that the welding tapes are accurately welded to the target positions of the solar cells. By arranging the tooling removing part 23 after the first heating mechanism 3, the automatic removal of the pressing tooling is realized.

[0138] Optionally, the battery stringing device in the embodiment of the present application further includes a soldering flux coating mechanism 5, and the soldering flux coating mechanism 5 is used to coat soldering flux on the welding tapes before the stringing mechanism 2 lays the welding tapes. The soldering flux is used to improve the welding quality between the welding tapes and the solar cells.

[0139] Optionally, the battery stringing device in the embodiment of the present application further includes a string splitting mechanism 6 and a second conveying mechanism 7. Among them, the second conveying mechanism 7 is located after the first conveying mechanism 1, and the string splitting mechanism 6 is arranged between the input end of the second conveying mechanism 7 and the output end of the first conveying mechanism 1. The string splitting mechanism 6 is used to split the overall battery string into multiple independent segmented battery strings.

[0140] In some embodiments, a second heating bottom plate 71 is disposed in the second conveying mechanism 7 and is located below the conveying surface of the second conveying mechanism 7. The second heating bottom plate 71 forms a third heat preservation and curing area, and the heating temperature of the third heat preservation and curing area is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder. Still taking the melting point of the solder used as 170 °C and the curing temperature of the thermosetting adhesive used as 120 °C as an example, the heating temperature of the third heat preservation and curing area is set to be higher than 120 °C and lower than 170 °C.

[0141] By arranging the second conveying mechanism 7 after the first conveying mechanism 1 and arranging a string splitting mechanism 6 between the first conveying mechanism 1 and the second conveying mechanism 7, the splitting process of the overall battery string is realized to obtain individual battery strings with a predetermined length.

[0142] By arranging a second heating plate 71 below the conveying surface of the second conveying mechanism 7, a third heat preservation and curing area is formed. Since the heating temperature of the third heat preservation and curing area is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder, when the split battery string passes through the third heat preservation and curing area under the conveying of the second conveying mechanism 7, the thermosetting adhesive on the surface of the battery cell can continue to cure, and the solder on the solder tape that has not fully solidified will continue to solidify, which can extend the curing time of the thermosetting adhesive and is applicable to thermosetting adhesives that require long-term curing.

[0143] The heating temperature of the third heat preservation and curing area can be set to be constant temperature, that is, the heating temperature at each part of the third heat preservation and curing area is the same temperature, such as 140 °C. Optionally, the second heating plate corresponding to the position of the third heat preservation and curing area can be a separate heating bottom plate, which generates a constant temperature third heat preservation and curing area through heating.

[0144] The heating temperature of the third heat preservation and curing area can also be set to decrease in a gradient. Still taking the melting point of the solder used as 170 °C and the curing temperature of the thermosetting adhesive used as 120 °C as an example, for example, the third heat preservation and curing area is sequentially divided into three continuous heating areas along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the three heating areas are 150 °C, 140 °C and 130 °C respectively.

[0145] In order to form a third heat preservation and curing area with a gradient decrease, optionally, the second heating bottom plate corresponding to the third heat preservation and curing area is composed of a plurality of independently temperature-controlled heating bottom plates.

[0146] Such as Figures 8 to 9As shown, optionally, the battery stringing device in the embodiments of the present application further includes a second heating mechanism 8 disposed after the tooling removal part 23, and the second heating mechanism 8 is located above at least one of the first conveying mechanism 1 and the second conveying mechanism 7. The second heating mechanism 8 includes a fourth heating assembly, and the heating area of the fourth heating assembly forms a fourth heat preservation and curing area, and the heating temperature of the fourth heat preservation and curing area is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder. Still taking the melting point of the solder used as 170°C and the curing temperature of the thermosetting adhesive used as 120°C as an example, the heating temperature of the fourth heat preservation and curing area is set to be higher than 120°C and lower than 170°C.

[0147] By forming a fourth heat preservation and curing area after the tooling removal part, after the pressing tooling is removed from the battery cell, the battery cell and the solder strip immediately enter the fourth heat preservation and curing area. The setting of the fourth heat preservation and curing area can prevent the battery cell from cooling, so that the incompletely cured thermosetting adhesive on the surface of the battery cell can continue to cure.

[0148] Case 2: The melting point of the solder is lower than the curing temperature of the hot melt adhesive.

[0149] For example, the melting point of the solder on the surface of the solder strip is 150°C, and the curing temperature of the thermosetting adhesive provided on the surface of the battery cell is 230°C. The heating temperature of the first welding and curing area needs to be set to be higher than 230°C.

[0150] As is known to those skilled in the art, affected by the material and processing technology, the sensitivity of the battery cell to temperature changes varies. In some embodiments, the battery cell is more sensitive to changes in the heating temperature. Therefore, it is necessary to finely adjust the heating temperature of the first welding and curing area non-constantly according to the specific temperature resistance performance of the battery cell to avoid welding defects such as false soldering, over-soldering, and broken grids.

[0151] Still taking the melting point of the solder used as 150°C and the curing temperature of the thermosetting adhesive used as 230°C as an example for illustration. For example, in one embodiment, the heating temperature in the first welding and curing area is set to increase gradually along the conveying direction of the first conveying mechanism 1. For example, the first welding and curing area is sequentially divided into three consecutive heating areas along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the three heating areas are 240°C, 250°C, and 260°C respectively. The lengths of the three heating areas can be set to be the same or different according to specific needs.

[0152] In another embodiment, the heating temperature of the first welding and curing area is set to decrease gradually along the conveying direction of the first conveying mechanism 1. For example, the first welding and curing area is sequentially divided into four consecutive heating areas along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the four heating areas are 270°C, 260°C, 250°C, and 240°C respectively. The lengths of the four heating areas can be set to be the same or different according to specific needs.

[0153] In yet another embodiment, the heating temperature of the first welding and curing zone is set to first increase in a gradient manner and then decrease in a gradient manner along the conveying direction of the first conveying mechanism 1. For example, the first welding and curing zone is sequentially divided into five consecutive heating zones along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the five heating zones are 240 °C, 250 °C, 260 °C, 250 °C, and 240 °C respectively. Similarly, the lengths of the five heating zones can be set to be the same or different according to specific needs.

[0154] In other embodiments, the heating temperature of the first welding and curing zone can also be set according to other variation rules to meet different welding and curing requirements.

[0155] To form a non-constant-temperature first welding and curing zone, the first heating assembly includes at least two first infrared lamp groups sequentially arranged along the conveying direction of the first conveying mechanism 1, and each first infrared lamp group can be independently temperature-controlled, so that each first infrared lamp group forms a corresponding heating zone with a different temperature.

[0156] For example, for the case where the first welding and curing zone is sequentially divided into three consecutive heating zones along the conveying direction of the first conveying mechanism 1 in the foregoing text, and the heating temperatures of the three heating zones are 240 °C, 250 °C, and 260 °C respectively, correspondingly, the first heating assembly includes three first infrared lamp groups sequentially arranged along the conveying direction of the first conveying mechanism 1, and the three first infrared lamp groups sequentially form three consecutive heating zones with heating temperatures of 240 °C, 250 °C, and 260 °C respectively.

[0157] Each first heating assembly can be composed of multiple lamp tubes or multiple lamp beads. The infrared lamp group has fast heat transfer, can quickly heat the battery cells, thereby shortening the time for solder melting and thermosetting adhesive curing, and improving the stringing efficiency.

[0158] In some other embodiments, the battery cells are not sensitive to the change of the heating temperature. Therefore, in order to reduce the difficulty of temperature control of the first welding and curing zone and the structural complexity of the first heating assembly, the heating temperature of the first welding and curing zone can be set to a constant temperature. For example, the heating temperature of the first welding and curing zone is set to a constant 240 °C.

[0159] To form a non-constant-temperature first welding and curing zone, the first heating assembly can include only one first infrared lamp group, and this first infrared lamp group forms a constant-temperature first welding and curing zone. Of course, the first heating assembly can also include more than two first infrared lamp groups, and the more than two first infrared lamp groups jointly form a constant-temperature first welding and curing zone.

[0160] Similarly, each first heating assembly can be composed of multiple lamp tubes or multiple lamp beads.

[0161] Such asFigures 1 to 2 As shown, optionally, a first heating bottom plate 11 is provided inside the first conveying mechanism 1 and is located below the conveying surface of the first conveying mechanism 1. The first heating bottom plate 11 includes a second welding and curing area, and the heating temperature of the second welding and curing area is higher than the curing temperature of the thermosetting adhesive. The starting end of the second welding and curing area is the same as the starting end of the first welding and curing area.

[0162] By providing the first heating bottom plate 11 below the conveying surface of the first conveying mechanism 1 and forming a second welding and curing area on the first heating bottom plate 11 that is the same as the starting end of the first welding and curing area, the second welding and curing area is used to assist the first welding and curing area in implementing the welding and curing of the battery cell and the solder strip, thereby accelerating the melting of the solder and the curing of the thermosetting adhesive, shortening the welding and curing time, and improving the efficiency of stringing the battery cells.

[0163] As Figure 10 shown, optionally, the length of the second welding and curing area B is equal to the length of the first welding and curing area A. With this setting, the second welding and curing area B can more fully assist the first welding and curing area A in heating, thereby further improving the stringing efficiency.

[0164] As Figure 11 shown, optionally, the length of the second welding and curing area B is longer than the length of the first welding and curing area A. With this setting, after the battery cell and the solder strip leave the first welding and curing area A, the thermosetting adhesive can continue to cure under the heating of the second welding and curing area B.

[0165] The length of the second welding and curing area B can also be set to be shorter than the length of the first welding and curing area A. The melting of the solder and the curing of the thermosetting adhesive mainly depend on the heating of the first welding and curing area A. Therefore, with this setting, it will not have an adverse effect on the melting of the solder and the curing of the thermosetting adhesive.

[0166] Still taking the melting point of the solder used as 150°C and the curing temperature of the thermosetting adhesive used as 230°C as an example. Optionally, the heating temperature of the second welding and curing area B is set to be constant temperature, that is, the heating temperature at each part of the second welding and curing area B is the same temperature, such as 235°C. Optionally, the first heating bottom plate 11 at the position corresponding to the second welding and curing area B can be a separate heating bottom plate, which generates a constant temperature second welding and curing area through heating.

[0167] The heating temperature of the second welding and curing area B can also be set to be non-constant temperature. For example, in one embodiment, the heating temperature inside the second welding and curing area B is set to increase gradually along the conveying direction of the first conveying mechanism 1. For example, the second welding and curing area is sequentially divided into three consecutive heating areas along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the three heating areas are 235°C, 240°C, and 245°C respectively.

[0168] In another embodiment, the heating temperature in the second welding and curing zone B is set to decrease in a gradient along the conveying direction of the first conveying mechanism 1. For example, the second welding and curing zone B is sequentially divided into four consecutive heating zones along the conveying direction of the first conveying mechanism 1, and the heating temperatures of the four heating zones are 250 °C, 245 °C, 240 °C, and 235 °C, respectively.

[0169] To form the non-constant temperature second welding and curing zone B, optionally, the first heating bottom plate 11 corresponding to the second welding and curing zone B is composed of a plurality of independently temperature-controlled heating bottom plates.

[0170] It should be noted here that for the case where the melting point of the solder is lower than the curing temperature of the hot melt adhesive, the thermosetting adhesive on the battery chip must be completely cured in the welding and curing zone, and no further heat preservation and curing will be carried out later. That is to say, when only the first welding and curing zone A is set, when the battery chip and the solder strip leave the first welding and curing zone A, the hot melt adhesive on the battery chip is completely cured. When the first welding and curing zone A and the second curing zone B are set at the same time, when the battery chip and the solder strip leave the first welding and curing zone A and the second curing zone B, the hot melt adhesive on the battery chip is completely cured.

[0171] To ensure the complete curing of the thermosetting adhesive, it can be achieved by extending the lengths of the first welding and curing zone A and the second curing zone B, or by reducing the conveying speed of the battery chip and the solder strip.

[0172] Optionally, the first heating mechanism 3 further includes a third heating component located in front of the first heating component. As Figures 8 to 9 shown, the heating zone of the third heating component forms a first buffer zone E, and the heating temperature of the first buffer zone E is higher than 30 °C and lower than the melting point of the solder. Still taking the melting point of the solder used as 150 °C as an example, the heating temperature of the first buffer zone is set to be higher than 30 °C and lower than 150 °C.

[0173] By forming the first buffer zone E in front of the first welding and curing zone A, the battery chip and the solder strip pass through the first buffer zone E first before entering the first welding and curing zone A, and can be pre-heated in the first buffer zone E in advance.

[0174] To achieve a good welding effect, the battery chip needs to be gradually and slowly heated from room temperature to a temperature higher than the melting point of the solder. In this way, the stress of the battery chip can be reduced, and welding defects such as virtual soldering, over-soldering, and broken grids can be avoided.

[0175] For this reason, optionally, the first buffer zone E includes a first preheating zone and a first temperature rising zone arranged in sequence, wherein the temperature of the first preheating zone is higher than 30 °C and lower than 120 °C, and the temperature of the first temperature rising zone is higher than the temperature of the first preheating zone and lower than the melting point of the solder.

[0176] Still taking the melting point of the solder used as 150°C as an example, the temperature of the first preheating zone can be set to a constant temperature, such as 100°C. The temperature of the first preheating zone may also be set to rise in a gradient. For example, the first preheating zone is sequentially divided into three consecutive heating zones along the conveying direction of the first conveying mechanism 1, and the temperatures of the three heating zones are 50°C, 70°C, and 90°C respectively. Similarly, the first temperature rising zone can be set to a constant temperature, such as 140°C. The temperature of the first temperature rising zone may also be set to rise in a gradient. For example, the first temperature rising zone is sequentially divided into four consecutive heating zones along the conveying direction of the first conveying mechanism 1, and the temperatures of the four heating zones are 110°C, 120°C, 130°C, and 140°C respectively.

[0177] For the case where the first heating bottom plate 11 is provided below the conveying surface of the first conveying mechanism 1. As Figures 10 to 11 shown, optionally, the first heating bottom plate 11 further includes a second buffer zone F in front of the second welding and curing zone B. The heating temperature of the second buffer zone F is higher than 30°C and lower than the melting point of the solder. The starting point of the second buffer zone F coincides with the starting point of the first buffer zone E, or the starting point of the second buffer zone F is earlier than the starting point of the first buffer zone E.

[0178] By forming the second buffer zone F on the first heating bottom plate 11 that coincides with or is earlier than the starting point of the first buffer zone E, the second buffer zone F and the first buffer zone E cooperate to preheat the battery cell and the solder strip in advance, which is beneficial to ensuring the quality of the battery cell.

[0179] Similarly, in order to achieve good welding effects, the battery cell needs to be gradually and slowly heated from room temperature to a temperature higher than the melting point of the solder. In this way, the stress of the battery cell can be reduced, and welding defects such as virtual soldering, over-soldering, and broken grids can be avoided. Optionally, the second buffer zone F includes a second preheating zone and a second temperature rising zone that are sequentially arranged along the conveying direction of the conveying mechanism 1.

[0180] Still taking the melting point of the solder used as 150°C as an example, the temperature of the second preheating zone can be set to a constant temperature, such as 80°C. The temperature of the second preheating zone may also be set to rise in a gradient. For example, the second preheating zone is sequentially divided into three consecutive heating zones along the conveying direction of the second conveying mechanism 1, and the temperatures of the three heating zones are 40°C, 60°C, and 80°C respectively. Similarly, the second temperature rising zone can be set to a constant temperature, such as 120°C. The temperature of the second temperature rising zone may also be set to rise in a gradient. For example, the second temperature rising zone is sequentially divided into four consecutive heating zones along the conveying direction of the first conveying mechanism 1, and the temperatures of the four heating zones are 100°C, 110°C, 120°C, and 130°C respectively.

[0181] As Figures 1 to 2As shown, optionally, the battery stringing device in the embodiments of the present application further includes a cooling mechanism 4. The cooling mechanism 4 is disposed above the first conveying mechanism 1 and behind the first heating mechanism 3. The cooling mechanism 4 is used to cool the battery cells and the solder tapes. The cooling temperature of the cooling mechanism 4 is lower than the melting point of the solder, so that the solder on the solder tapes solidifies. The cooling mechanism 4 can adopt an air-cooling device.

[0182] By arranging the cooling mechanism 4 behind the first heating mechanism 3, rapid cooling of the battery cells and solder tapes after welding and curing is achieved, so that the solder solidifies faster.

[0183] To avoid the solder being heated and melted again after being cooled and solidified, as Figures 10 to 11 shown, for the case where the first heating bottom plate 11 is arranged in the first conveying mechanism 1, the cooling mechanism 4 is preferably arranged behind the first welding and curing area A and the second welding and curing area B. In this way, after the battery cells and solder tapes leave the first welding and curing area A and the second welding and curing area B, they are cooled by the cooling mechanism 4. Of course, for the case where the first heating bottom plate 11 is not arranged in the first conveying mechanism 1, the cooling mechanism 4 is arranged behind the first welding and curing area A. In this way, after the battery cells and solder tapes leave the first welding and curing area A, they are cooled by the cooling mechanism 4.

[0184] As Figure 1 and Figure 2 shown, optionally, the stringing mechanism 2 includes a battery cell placing part 21, a solder tape placing part 22 and a tool removing part 23, where: the battery cell placing part 21 is used to place battery cells on the first conveying mechanism 1 according to a predetermined stringing rule, the solder tape laying part 22 is used to place solder tapes on the first conveying mechanism 1 according to a predetermined stringing rule, and the battery cell placing part 21 is further used to place a pressing tool on the battery cells with solder tapes placed on the first conveying mechanism 1 to press the solder tapes onto the battery cells. The tool removing part 23 is located behind the first heating mechanism 3 and is used to remove the pressing tool from the battery cells after the solder on the solder tapes solidifies.

[0185] Through the cooperation of the battery cell placing part 21 and the solder tape placing part 22, the stringing mechanism 2 realizes the automatic placement of battery cells and solder tapes into a string, and automatically places the pressing tool on the battery cells with solder tapes placed thereon, so as to press the solder tapes onto the battery cells, prevent the solder tapes from shifting in position during transportation, and ensure that the solder tapes are accurately welded to the target positions of the battery cells. By arranging the tool removing part 23 behind the first heating mechanism 3, automatic removal of the pressing tool is realized.

[0186] Optionally, the battery stringing device in the embodiments of the present application further includes a flux coating mechanism 5. The flux coating mechanism 5 is used to coat flux on the solder tapes before the stringing mechanism 2 lays the solder tapes. The flux is used to improve the welding quality between the solder tapes and the battery cells.

[0187] Optionally, the battery stringing device in the embodiments of the present application further includes a string splitting mechanism 6 and a second conveying mechanism 7. Among them, the second conveying mechanism 7 is located at the back of the first conveying mechanism 1, and the string splitting mechanism 6 is arranged between the input end of the second conveying mechanism 7 and the output end of the first conveying mechanism 1. The string splitting mechanism 6 is used to split the overall battery string into multiple independent segmented battery strings.

[0188] The embodiments of the present application also provide a battery stringing method for stringing battery cells into a battery string. The battery stringing method in the embodiments of the present application can be implemented by the battery stringing device provided in any of the previous embodiments.

[0189] As Figure 14 shown, the battery stringing method in the embodiments of the present application includes the following steps:

[0190] S1. Arrange the battery cells and the welding tapes according to a predetermined string layout rule. Among them, thermosetting adhesives are arranged at intervals on the surface of the battery cells along the welding tape laying path, and the welding tapes are placed on the welding tape laying paths on the surfaces of the corresponding battery cells.

[0191] S2. Perform welding and curing treatment on the arranged battery cells and welding tapes. The heating temperature of the welding and curing treatment is higher than the melting point of the solder on the surface of the welding tape and higher than the curing temperature of the thermosetting adhesive. The heating time of the welding and curing treatment is less than or equal to 15 s.

[0192] The battery stringing method provided by the embodiments of the present application simultaneously cures the adhesive points of the battery cells with thermosetting adhesive points and heats and melts the solder of the welding tapes. In this way, the curing of the adhesive points and the welding of the welding tapes can be carried out simultaneously. After the battery cells are strung, the welding quality inspection of the battery string can be carried out, so as to facilitate the early detection of unqualified battery strings and the timely repair of unqualified battery strings.

[0193] As described in the previous embodiments, optionally, the welding and curing treatment can be implemented by the first welding and curing area formed by the first heating mechanism. It can also be implemented in cooperation with the second welding and curing area composed of the first welding and curing area formed by the first heating mechanism and the first heating bottom plate.

[0194] Optionally, the curing temperature of the thermosetting adhesive is 100°C to 250°C, and the melting point of the solder on the surface of the welding tape is 130°C to 250°C. The heating temperature of the welding and curing treatment is 130°C to 300°C and higher than the curing temperature of the thermosetting adhesive and the melting point of the solder. For example, the melting point of the solder used is 170°C, the curing temperature of the thermosetting adhesive used is 120°C, and the heating temperature of the first welding and curing area is set to 220°C.

[0195] The thermosetting adhesive can be at least one of epoxy resin adhesives, phenolic resin adhesives, polyurethane adhesives, acrylic adhesives, and silicone adhesives. The above thermosetting adhesives can all have good bonding performance and can be quickly cured after heating.

[0196] The solder on the surface of the solder tape can be at least one of tin-lead alloy, tin-lead-bismuth alloy, tin-lead-indium alloy, tin-bismuth-silver alloy, and tin-bismuth-copper alloy. The above solders can all firmly weld the solder tape to the battery cell and ensure a metallized connection with good conductive effect between the solder tape and the battery cell.

[0197] As described above, the melting point of the solder may be higher than the curing temperature of the hot melt adhesive or may be lower than the curing temperature of the hot melt adhesive. For the case where the melting point of the solder is lower than the curing temperature of the hot melt adhesive, the thermosetting adhesive is cured within the heating time of the welding and curing process. That is to say, after the battery cell and the solder tape have undergone the welding and curing process, the thermosetting adhesive is completely cured. At this time, the heating time of the welding and curing process depends on the time for the thermosetting adhesive to complete curing to ensure that the thermosetting adhesive can be fully cured. The molten solder on the solder tape solidifies after the welding and curing process is completed.

[0198] And for the case where the melting point of the solder is higher than the curing temperature of the hot melt adhesive, as Figure 15 shown, after performing the welding and curing process on the arranged battery cells and solder tapes, that is, after performing step S2, the method for forming a battery string in the embodiment of the present application further includes:

[0199] S3. Perform a heat preservation and curing process on the battery cells and solder tapes that have undergone the welding and curing process to make the molten solder solidify and the thermosetting adhesive continue to cure, wherein the heating temperature of the heat preservation and curing process is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder, and the sum of the time of the welding and curing process and the heat preservation and curing process is 5s - 20s.

[0200] Since a heat preservation and curing process is also set after the welding and curing process, the time of the welding and curing process can only ensure that the solder can be melted, which can greatly shorten the time of the welding and curing process. For example, for some solders, the time of the welding and curing process can be shortened to 0.2s, 0.3s, 0.6s, etc. After the battery cells and solder tapes have undergone the welding and curing process, the thermosetting adhesive on the surface of the battery cells has not been completely cured. By performing a heat preservation and curing process on the battery cells and solder tapes, the molten solder is made to solidify faster and the thermosetting adhesive continues to be quickly cured.

[0201] As described in the previous embodiments, the heat preservation and curing can be implemented by the first heat preservation and curing area composed of the first heating mechanism. It can also be implemented in cooperation with the second heat preservation and curing area composed of the first heating mechanism and the first heating bottom plate.

[0202] Optionally, asFigure 16 As shown, before performing the welding and curing treatment on the arranged solar cells and solder tapes, that is, before performing step S2, the method for stringing solar cells in the embodiments of the present application further includes:

[0203] S4. Perform a buffer heating treatment on the arranged solar cells and solder tapes, where the heating temperature of the buffer heating treatment is higher than 30°C and lower than the melting point of the solder, the buffer heating treatment is heated by means of constant temperature heating or multi-stage gradient heating, and the heating time of the buffer heating treatment is less than or equal to 5 s.

[0204] By performing a buffer heating treatment on the arranged solar cells and solder tapes, preheating of the solar cells and solder tapes before starting to receive the welding and curing treatment is achieved, thereby reducing the occurrence of poor welding of the solar cells.

[0205] As described in the previous embodiments, the buffer heating can be implemented by the first buffer area composed of the first heating mechanism, or can be implemented in cooperation with the second buffer area composed of the first buffer area composed of the first heating mechanism and the first heating bottom plate.

[0206] To achieve a good welding effect, the solar cells need to be gradually and slowly heated from room temperature to a temperature higher than the melting point of the solder. In this way, the stress of the solar cells can be reduced, and welding defects such as false soldering, over soldering, and broken grids can be avoided.

[0207] Optionally, the step S4 of performing a buffer heating treatment on the arranged solar cells and solder tapes specifically includes:

[0208] S41. Perform a preheating treatment on the arranged solar cells and solder tapes, where the heating temperature of the preheating treatment is 30°C to 120°C, and the preheating treatment is heated by means of constant temperature heating or multi-stage gradient heating.

[0209] S42. Perform a temperature rising treatment on the arranged solar cells and solder tapes, where the heating temperature of the temperature rising treatment is higher than the heating temperature of the preheating treatment and lower than the melting point of the solder, and the temperature rising treatment is heated by means of constant temperature heating or multi-stage gradient heating.

[0210] Optionally, as Figure 17 shown, after performing the welding and curing treatment on the arranged solar cells and solder tapes, that is, after performing step S2, the method for stringing solar cells in the embodiments of the present application further includes:

[0211] S5. Perform a blowing and cooling treatment on the solar cells and solder tapes that have undergone the welding and curing treatment to accelerate the solidification of the melted solder.

[0212] Optionally, in step S1, before placing the solder tape on the corresponding solar cell, a soldering flux is first coated on the surface of the solder tape to improve the welding quality between the solder tape and the solar cell.

[0213] Before performing the welding and curing treatment on the arranged solar cells and solder tapes, the solder tapes are pressed tightly on the corresponding solar cells, so that the solder tapes are in close contact with the grid lines on the solar cells, improving the welding quality between the solder tapes and the solar cells and preventing false soldering.

[0214] As Figures 12 to 13 shown, optionally, the solar cell 100 is a main-gridless solar cell, the thermosetting adhesive 200 is located between two adjacent sub-grid lines 101 of the solar cell 100, the solder tapes are laid on the laying paths of the solder tapes 300 on the surface of the corresponding solar cells, and are perpendicular to and intersect with each sub-grid line 101 on the surface of the corresponding solar cell. After the solder tapes are bonded to the solar cells through the thermosetting adhesive, the solder tapes make conductive contact with each sub-grid line on the solder tape laying path.

[0215] The above has described the present application in sufficient detail with a certain degree of particularity. Those of ordinary skill 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 present application should fall within the protection scope of the present application. The scope of protection required by the present application is defined by the claims described, rather than by the above descriptions in the embodiments. Moreover, the embodiments mentioned in the present application are not limited to being implemented individually, and some embodiments can also be implemented in combination.

Claims

1. A battery string device, characterized in that: Used to connect battery cells in series into battery strings, the battery stringing equipment includes a first conveying mechanism, a stringing mechanism and a first heating mechanism, wherein: The stringing mechanism is used to arrange the battery cells and the welding ribbons on the first conveying mechanism according to a predetermined stringing rule, wherein: Thermosetting adhesive is arranged at intervals on the surface of the battery cell along the solder strip laying path, and the solder strip is laid on the solder strip laying path on the corresponding surface of the battery cell; The first heating mechanism is arranged above the first conveying mechanism, and the first heating mechanism includes a first heating component. The heating area of ​​the first heating component forms a first welding solidification area. The first conveying mechanism is used to convey the laid battery cells and welding strips to the first welding solidification area. The heating temperature of the first welding solidification area is higher than the melting point of the solder on the surface of the welding strip and higher than the curing temperature of the thermosetting adhesive.

2. The battery stringing device according to claim 1, characterized in that: The heating temperature of the first welding curing zone is constant, and the first heating assembly includes at least one first infrared lamp group; or, The heating temperature of the first welding curing zone is non-constant temperature, and the first heating assembly includes at least two first infrared lamp groups arranged in sequence along the conveying direction of the first conveying mechanism, and each of the first infrared lamp groups can be independently temperature-controlled.

3. The battery stringing device according to claim 1, characterized in that: The first heating mechanism also includes a second heating component located after the first heating component, the heating area of ​​the second heating component forms a first insulation and curing zone, the first conveying mechanism is used to convey the laid battery cells and solder strips to the first welding curing zone and the first insulation and curing zone in sequence, and the heating temperature of the first insulation and curing zone is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder.

4. The battery stringing device according to claim 1, characterized in that: The first conveying mechanism is provided with a first heating bottom plate located below the conveying surface of the first conveying mechanism; the first heating bottom plate includes a second welding curing zone, and the heating temperature of the second welding curing zone is at least higher than the curing temperature of the thermosetting adhesive; The starting end of the second welding solidification zone is the same as the starting end of the first welding solidification zone, and the length of the second welding solidification zone is shorter than, equal to or longer than the length of the first welding solidification zone; The heating temperature of the second welding solidification zone is constant temperature or non-constant temperature.

5. The battery stringing device as claimed in claim 4, characterized in that: The first heating base plate further includes a second heat preservation and curing zone located after the second soldering and curing zone, and the heating temperature of the second heat preservation and curing zone is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder.

6. The battery stringing device as claimed in claim 4, characterized in that: The first heating mechanism also includes a third heating component located in front of the first heating component. The heating area of ​​the third heating component forms a first buffer zone. The heating temperature of the first buffer zone is higher than 30° C. and lower than the melting point of the solder.

7. The battery stringing device as claimed in claim 6, characterized in that: The first buffer zone includes a first preheating zone and a first heating zone arranged in sequence, the temperature of the first preheating zone is higher than 30°C and lower than 120°C, and the temperature of the first heating zone is higher than the temperature of the first preheating zone and lower than the melting point of the solder.

8. The battery stringing device as claimed in claim 6, characterized in that: The first heating base plate further comprises a second buffer zone located in front of the second soldering solidification zone, and the heating temperature of the second buffer zone is higher than 30° C. and lower than the melting point of the solder; The starting point of the second buffer area coincides with the starting point of the first buffer area, or the starting point of the second buffer area is earlier than the starting point of the first buffer area.

9. The battery stringing device as claimed in claim 8, characterized in that: The second buffer zone includes a second preheating zone and a second heating zone which are arranged in sequence, the temperature of the second preheating zone is higher than 30° C. and lower than 120° C., and the temperature of the second heating zone is higher than the temperature of the second preheating zone and lower than the melting point of the solder.

10. The battery stringing device according to claim 1, characterized in that: The battery string-forming equipment also includes a cooling mechanism, which is arranged above the first conveying mechanism and located after the first heating mechanism. The cooling mechanism is used to cool the battery cells and solder strips. The cooling temperature of the cooling mechanism is lower than the melting point of the solder so that the solder of the solder strips solidifies.

11. The battery stringing device according to claim 1, characterized in that: The string placing mechanism includes a cell placing part, a solder strip placing part and a tool removing part, wherein: The cell placement unit is used to place the cell on the first conveying mechanism according to the predetermined arrangement rule, the solder tape placement unit is used to place the solder tape on the first conveying mechanism according to the predetermined arrangement rule, and the cell placement unit is further used to place a pressing tool on the cell with the solder tape on the first conveying mechanism to press the solder tape onto the cell; The tool removing portion is located at the rear of the first heating mechanism, and is used to remove the pressing tool from the battery cell after the solder of the solder strip is solidified.

12. The battery stringing device according to claim 1, characterized in that: The battery stringing device also includes a flux coating mechanism, which is used to coat flux on the soldering tape before the string laying mechanism lays the soldering tape.

13. The battery stringing device according to any one of claims 1 to 10 and claim 12, characterized in that: The battery string forming device also includes a string dividing mechanism and a second conveying mechanism, wherein the second conveying mechanism is located behind the first conveying mechanism, and the string dividing mechanism is arranged between the input end of the second conveying mechanism and the output end of the first conveying mechanism, and the string dividing mechanism is used to divide the entire battery string into multiple independent segmented battery strings.

14. The battery stringing device according to claim 13, characterized in that: The second conveying mechanism is provided with a second heating base plate located below the conveying surface of the second conveying mechanism, and the second heating base plate forms a third heat preservation and curing zone. The heating temperature of the third heat preservation and curing zone is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder.

15. The battery stringing device according to claim 11, characterized in that: The battery string forming device further includes a string dividing mechanism and a second conveying mechanism, wherein the second conveying mechanism is located after the first conveying mechanism, the string dividing mechanism is arranged between the input end of the second conveying mechanism and the output end of the first conveying mechanism, and the string dividing mechanism is used to divide the whole battery string into a plurality of independent segmented battery strings; The second conveying mechanism is provided with a second heating bottom plate located below the conveying surface of the second conveying mechanism, the second heating bottom plate forms a third heat preservation and curing zone, and the heating temperature of the third heat preservation and curing zone is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder; The battery stringing device further includes a second heating mechanism disposed at the rear of the tooling removal portion, the second heating mechanism being located above at least one of the first conveying mechanism and the second conveying mechanism; The second heating mechanism comprises a fourth heating component, a heating zone of the fourth heating component forms a fourth heat preservation and curing zone, and a heating temperature of the fourth heat preservation and curing zone is higher than the curing temperature of the thermosetting adhesive and lower than the melting point of the solder.

16. The battery stringing device according to claim 1, characterized in that: The cell is a busbar-free cell, the thermosetting adhesive is located between two adjacent secondary grid lines of the cell, the welding tape is laid on the welding tape laying path on the corresponding surface of the cell, and perpendicularly intersects each of the secondary grid lines on the corresponding surface of the cell; or, The battery cell is a battery cell with a main grid, and the thermosetting adhesive is arranged at intervals on the main grid line of the battery cell.

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